DESC:FIELD
The present disclosure generally relates to the field of machinery system for building construction application and more specifically, relates to a compact assembly for spraying slurry for construction industry application.
DEFINITION
As used in the present disclosure, the following terms are generally intended to have the meaning as set forth below, except to the extent that the context in which they are used indicate otherwise.
PRESSURE SWITCH: The term ‘Pressure switch’ used in the context of this disclosure refers to, but is not limited to, an actuating element or control switch which detects pressurized air inside any tubing passage and actuate other components based on system demand or requirements.
ELECTRO-MECHANICAL CONNECTION: The term ‘Electro-mechanical connection’ used in the context of this disclosure refers to an electrical connection between a conveying and pressurizing unit and an air compression device such that, once a knob for air supply gets actuated, the conveying and pressurizing unit along with the compression device also get activated with a defined time lag.
These definitions are in addition to those expressed in the art.
BACKGROUND
The background information herein below relates to the present disclosure but is not necessarily prior art.
Traditionally, the plaster is distributed manually over the wall surface. However, the manual distribution of the plaster requires lots of human effort as well as consumes time. Also, it is difficult to obtain the smooth and even surface finish through the manual distribution of the plaster. Therefore, a conventional plaster dispensing machine was developed.
However, the conventional plaster dispensing machine involves a complex assembly of the different components, which is difficult to engage as well as disengage and thereby, it creates trouble while cleaning the machine. Also, the conventional machine consists of a large number of movable parts which leads to the continuous wear and tear of the different mating members. Additionally, these machine requires skilled or trained operators and advanced knowledge for its engagement as well as disengagement.
Further, the conventional plaster dispensing machine requires a separate arrangement for pressurizing and a separate arrangement for conveying, which makes the apparatus bulky and thereby makes it difficult to transport without any support or a towing vehicle. Also, due to the separate arrangement for pressurizing and conveying, the overall cost of the dispensing machine increases. Furthermore, due to the separate arrangement of the dispensing machine, it requires a large space for parking.
There is, therefore, felt a need of a slurry spraying apparatus that alleviates the aforementioned drawbacks.
OBJECTS
Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:
It is an object of the present disclosure to ameliorate one or more problems of the prior art or to at least provide a useful alternative.
An object of the present disclosure is to provide a slurry spraying apparatus.
Yet another object of the present disclosure is to provide a slurry spraying apparatus which offers easy assembly and disassembly of movable components.
Still another object of the present disclosure is to provide a slurry spraying apparatus which offers easy cleaning of the conveying system.
Another object of the present disclosure is to provide a slurry spraying apparatus which minimizes the operation time of slurry application.
Still another object of the present disclosure is to provide a slurry spraying apparatus which reduces operation and maintenance cost.
Yet another object of the present disclosure is to provide a slurry spraying apparatus which provides a compact assembly of delivering components.
Still another object of the present disclosure is to provide a slurry spraying apparatus which is convenient to transport and to park.
Yet another object of the present disclosure is to provide a method for spraying slurry on a desired surface.
Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.
SUMMARY
The present disclosure envisages a slurry spraying apparatus and a method of spraying slurry. The apparatus comprises a slurry holding chamber, a conveying and pressurizing unit, an air compression device, a mixing chamber, and a nozzle. The holding chamber is configured to receive pre-mix slurry. The conveying and pressurizing unit is configured to receive slurry from the holding chamber and further configured to pressurize received slurry.
A first passage is provided operatively downstream of the conveying and pressuring unit which is configured to deliver pressurized slurry. The air compression device is configured to receive air from the surrounding and further configured to compress received air. A second passage is provided operatively downstream of the compression device which is configured to deliver pressurized air.
In an embodiment, the conveying and pressurizing unit, slurry holding chamber, and the air compression device are mounted and enclosed inside housing.
In another embodiment, the first passage of the conveying and pressurizing unit protrudes out from the housing.
Further, the conveying and pressurizing unit consists of a conveying zone and a pressurizing zone. The conveying zone includes a screw conveyor which is configured to receive slurry from an operative downstream of the slurry holding chamber. The pressurizing zone includes a stator-rotor assembly in communication with the screw conveyor of the conveying zone. The pressurizing zone configured to pressurize received slurry from the conveying zone and deliver the pressurized slurry operatively downstream through the first passage.
In a preferred embodiment, the stator-rotor assembly is having a rotor with external helix geometry and a stator with an internal circular geometry.
In another embodiment, the conveying zone and the pressurizing zone are provided as a series configuration.
Further, the rotor is operatively rotating in a defined space of the stator with progressive circumferential sealing. The rotor is detachably connected with the stator of the stator-rotor assembly.
In an embodiment, the rotor is casted from the tool steel hard chrome plating (HCP) and the stator is casted from the high grade nitrile rubber-molded steel.
Further, the mixing chamber is located operatively downstream of the conveying and pressurizing unit and the compression device. The chamber is configured to receive the pressurized slurry and pressurized air from the first passage and the second passage respectively, to thereby increase pressure of pressurized slurry to make sprayable slurry.
The nozzle is located operatively downstream of the mixing chamber and configured to receive sprayable slurry from the mixing chamber and further configured to spray the sprayable slurry to a surface in need of the slurry spray.
In a preferred embodiment, the nozzle is integrally built with the mixing chamber, wherein the nozzle is located operatively downstream to the mixing chamber.
In an embodiment, the nozzle is configured with a replaceable cap, thereby the flow rate of sprayable slurry can be varied.
Further, the apparatus includes a driving member which is configured to drive the screw conveyor. The screw conveyor is mechanically engaged with the stator-rotor assembly. Thus, the driving motion is being transmitted from the driving member to the stator-rotor assembly via the screw conveyor, and thereby enables the movement of slurry through the conveying and pressurizing unit.
In an embodiment, the stator-rotor assembly is positionally engaged with the screw conveyor by means of a plurality of tie-rods.
In another embodiment, the stator-rotor assembly is removably attached with the screw conveyor, thereby allow the assembly line to be removable at once.
In another embodiment, the driving member is an electric motor.
Further, the mixing chamber is configured with a first inlet port and a second inlet port, wherein the first inlet port is operatively located behind the second inlet port on the mixing chamber. A pipe is provided attached to the first inlet port of the mixing chamber.
In an embodiment, the operative front portion of the pipe is bent at pre-determined angle with respect to the operative rear portion of the pipe.
In an embodiment, the pipe is made of anti-corrosive material selected from mild steel, alloy steel, carbon steel, and aluminium.
Further, the apparatus includes a delivery tube, configured to be in fluid communication with a second end of the pipe and the first passage. The delivery tube is configured to receive pressurized slurry from the conveying and pressurizing unit.
Also, a hose pipe is provided, configured to fluidly communicate the second inlet port with the second passage. The hose pipe is configured to deliver pressurized air to the mixing chamber.
Furthermore, a knob is attached to the hose, which facilitates the activation and deactivation of the conveying and pressurizing unit and the air compression device. The apparatus also includes at least one contactor and at least one timer. The contactor and the timer are configured to establish an electro-mechanical connection between the conveying and pressurizing unit and the compression device, thereby with the activation of knob, the contactor and timer enables the simultaneous activation of the conveying and pressurizing unit and the compression device.
In an embodiment, the knob is provided in proximity of the mixing chamber, and thereby provides remotely access of the apparatus.
Advantageously, the assembly line of the conveying and pressurizing unit is removable by loosening the tie-rod, and thereby it offers easy cleaning and maintenance of the conveying and pressurizing unit. Also, the direct coupling of the screw conveyor with the stator-rotor assembly provides a positive torque for the movement of slurry.
In an embodiment, the apparatus is provided with a pressure switch which is configured to sense the air pressure inside the hose pipe.
In another embodiment, the spraying apparatus is configured with a spray mode which enables the activation of the conveying and pressurizing unit and the air compression device simultaneously and thereby, facilitates the spraying of slurry.
In an embodiment, the apparatus is provided with a pressure regulator having a dial indicator, wherein the regulator is configured to regulate the pressure of the air compression device.
Further, the method of spraying slurry onto a surface in need thereof comprises the following steps:
• pouring slurry into the slurry holding chamber of the spraying apparatus;
• receiving slurry from the holding chamber into the conveying and pressurizing unit and further pressurizing the received slurry;
• transferring pressurized slurry to the mixing chamber of the nozzle by means of the conveying and pressurizing unit;
• compressing air in the air compression device and delivering pressurized air to the mixing chamber;
• increasing the pressure of pressurized slurry further by means of pressurized air received inside the mixing chamber (16), to thereby making sprayable slurry; and
• releasing sprayable slurry from the nozzle on to the desired surface.
In a preferred embodiment, the spraying apparatus is a horizontal screw-pump conveying apparatus.
In an embodiment, the pressure of slurry in the conveying and pressurizing unit is in the range of 4.5 bar to 6.0 bar.
In another embodiment, the pressure of compressed air delivered to the mixing chamber is in the range of 1.2 bar to 2.0 bar.
Advantageously, the apparatus is mounted on a wheel base having a pair of front wheels and a pair of rear wheels. The wheel base facilitates the towing of the apparatus by means of a suitable towing van.
Also, the conveying and pressurizing unit and the air compression device are mounted inside the housing; thereby it provides a compact layout structure which is convenient to park.
Typically, slurry is selected from a group consisting of mud, cement, gypsum, putty and any combination thereof.
BRIEF DESCRIPTION OF ACCOMPANYING DRAWING
A slurry spraying apparatus and a method of spraying slurry, of the present disclosure will now be described with the help of the accompanying drawing, in which:
Figure 1 illustrates a schematic of an assembly line of different component of a spraying apparatus, in accordance with an embodiment of the present disclosure;
Figure 2 illustrates a schematic engagement of a conveying and pressurizing unit including a stator-rotor assembly with a screw conveyor;
Figure 3 illustrates a front view of the spraying apparatus with an air compression device, a conveying and pressurizing unit, and a driving member;
Figure 4 illustrates an isometric view of the spraying apparatus as per an embodiment of the present disclosure;
Figure 5 illustrates a schematic of electro-mechanical connection of the conveying and pressurizing unit with an air compression device and a driving member of the spraying apparatus as per an embodiment of the present disclosure;
Figure 6 illustrates a schematic assembly of a nozzle with a hose pipe and a knob attached therein of the spraying apparatus; and
Figure 7 illustrates a different schematic of the spraying apparatus of the present disclosure.
LIST OF REFERENCE NUMERALS USED IN DETAILED DESCRIPTION AND DRAWING
100 - spraying apparatus
10 - slurry holding chamber
12 - conveying and pressurizing unit
12a - conveying zone
12b - pressurizing zone
14 - driving member
16 - mixing chamber
16a - first inlet port of mixing chamber
16b - second inlet port of mixing chamber
18 - nozzle
20a - stator
20b - rotor
22a - first end of screw conveyor
22b - second end of screw conveyor
24 - air compression device
26 - tie rod
28 - knob
30 - first passage
32 - pipe
32a - first end of pipe
32b - second end of pipe
34 - hose pipe
36 - second passage
38 - pressure switch
40 - pressure regulator
42 - contactor and timer
44 - front wheel
46 - rear wheel
48 - three phase wire outlet
50 - housing
52 - delivery tube
54 - perforations
70 - gripping handle

DETAILED DESCRIPTION
Embodiments, of the present disclosure, will now be described with reference to the accompanying drawing.
Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms "a,” "an," and "the" may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms "comprises," "comprising," “including,” and “having,” are open ended transitional phrases and therefore specify the presence of stated features, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, elements, components, and/or groups thereof.
When an element is referred to as being "mounted on," “engaged to,” "connected to," or "coupled to" another element, it may be directly on, engaged, connected or coupled to the other element. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed elements.
A conventional plaster distribution machine involves a complex assembly which is difficult to engage as well as disengage and thereby it offers problem while cleaning and maintenance. Further, the conventional plaster spraying machine consists of a large number of moving parts which leads to continuous wear and tear of the mating members. Also, these machines require trained operators and advanced knowledge for its operation and as well its maintenance.
Furthermore, the conventional plaster spraying machine requires separate arrangement for pressurizing and separate arrangement for conveying which makes the machine bulky and resulting in increase of cost. And thereby, the spraying machine is difficult to transport without any support or towing vehicle.
The present disclosure envisages a slurry spraying apparatus 100 and a method of spraying slurry. The spraying apparatus 100 is configured such that it pressurizes slurry, so as to spray slurry on a required surface at a predefined pressure.
An embodiment of the present disclosure will now be described with reference to the Figure 1. The apparatus 100 comprises a slurry holding chamber 10, a conveying and pressurizing unit 12, an air compression device 24, an mixing chamber 16 and a nozzle 18. The holding chamber 10 is configured to receive and hold pre-mix slurry from an external source and further deliver the required amount of slurry to the conveying and pressurizing unit 12. Thus, the holding chamber 10 provides a continuous supply of slurry to the conveying and pressurizing unit 12.
The conveying and pressurizing unit 12 is consists of a conveying zone 12a and a pressurizing zone 12b as shown in Figure 2. The conveying zone 12a includes a screw conveyor, which is configured to receive slurry from an operative downstream of the slurry holding chamber 10. Also, the pressurizing zone 12b includes a stator-rotor assembly in communication with the conveying zone 12a. The pressurizing zone 12b receives slurry from the conveying zone 12a and configured to deliver the pressurized slurry. A first passage 30 is provided operatively downstream of the conveying and pressurizing unit which is configured to deliver the pressurized slurry.
In an embodiment, the conveying zone 12a and the pressurizing zone 12b are provided in a series configuration.
The conveying and pressurizing unit 12, the slurry holding chamber 10 and the air compression device 24 are mounted inside a housing 50 as shown in Figure 3.
Further, the air compression device 24 receive air from surrounding through a plurality of perforations 54 provided on the housing 50 and configured to deliver pressurized air operatively downstream through an second passage 36 configured on the housing 50 as shown in the Figure 3 and Figure 4. The second passage 36 is protruded out from the housing 50.
In an embodiment, the output rating of the air compression device 24 is rated as 8 bars.
In another embodiment, the pressure of the compressed air delivered to the mixing chamber 16 is in the range of 1.2 bars to 2.0 bars.
Further, the mixing chamber 16 is located operatively downstream to the conveying and pressurizing unit 12 and the compression device 24 as shown in Figure 5. The mixing chamber 16 is configured with a first inlet port 16a, and a second inlet port 16b as shown in Figure 6. The first inlet port 16a, and the second inlet port 16b are provided on the operative upstream of the mixing chamber 16, wherein the first inlet port 16a is operatively located behind the second inlet port 16b on the mixing chamber 16.
Further, a pipe 32 is provided having a first end 32a and a second end 32b. The first end 32a is configured to attach with the first inlet port 16a. The second end 32b of the pipe 32 is in fluid communication with the first passage 30 by means of a delivery tube 52. The delivery tube 52 is configured to deliver pressurized slurry.
In an embodiment, the pipe 32 is made of anti-corrosive material. The material is selected from a group consisting of mild steel, alloy steel, carbon steel, and aluminum.
In an embodiment, the operative front portion of the pipe 32 is bent at a pre-determined angle with respect to the operative rear portion of the pipe 32.
Advantageously, the bending of the operative front portion of the pipe 32 with respect to the operative rear portion of the pipe 32 offers better vertical height coverage and accessibility for the nozzle 18 over the desired workable surface.
The apparatus is provided with a hose pipe 34. The pipe 34 is configured to fluidly communicate the second inlet port 32b with the second passage 36. The hose pipe 34 is delivering pressurized air.
Further, the mixing chamber 16 is configured to receive pressurized slurry and pressurized air from the first passage 30 and the second passage 36 respectively, to thereby increase pressure of pressurized slurry to make sprayable slurry.
The nozzle 18 is configured to receive the sprayable slurry from the mixing chamber 16 and spray the sprayable slurry to a surface in need of the slurry spray as shown in Figure 5 and Figure 6.
In a preferred embodiment, the nozzle 18 is integrally built with the mixing chamber 16. The nozzle 18 is mounted operatively downstream of the mixing chamber 16.
In another embodiment, the nozzle 18 is configured with a replaceable cap, thereby the flow rate of slurry can be varied. The nozzle cap is easily attachable and detachable with the nozzle head.
Further, the stator-rotor assembly is having a stator 20a and a rotor 20b, wherein the rotor 20b operatively rotates inside the circumference of the stator 20a, thus creates a positive pressure gradient towards the operative downstream of the first passage 30. Also, the rotor 20b is detachably connected with the stator 20a. The stator-rotor assembly is positionally engaged with the screw conveyor by means of a plurality of tie-rods 26.
In an embodiment, the rotor 20b is provided with external helix geometry and the stator 20a with an internal circular geometry.
In another embodiment, the rotor 20b is casted from tool steel hard chrome plating (HCP) and the stator 20a is casted from high grade nitrile rubber-molded steel.
In a preferred embodiment, the first passage 30 of the conveying and pressurizing unit 12 protrudes out from the housing 50 as shown in Figure 3, Figure 4 and Figure 7.
Further, the apparatus 100 includes a driving member 14. The driving member 14 is configured to drive the screw conveyor as shown in Figure 2, Figure 3, Figure 4 and Figure 5. A first end 22a of the screw conveyor is coupled with the driving member 14 and a second end 22b is mechanically engaged with the rotor 20b of the stator-rotor assembly. Thereby, the driving power of the driving member 14 gets transmitted to the stator-rotor assembly. Therefore, the direct coupling of the screw conveyor with the stator-rotor assembly provides a positive torque for the movement of slurry. This enables the movement of slurry through the conveying and pressurizing unit 12 towards the downstream of the first passage 30.
In an embodiment, the driving member 14 is an electric motor or a battery- operated motor.
Advantageously, the stator-rotor assembly and the screw conveyor are configured to be removable by loosening of the tie-rods 26 as shown in Figure 1. Thus, it helps in easy dismantling of the stator-rotor assembly from the screw conveyor and therefore offers easiness in cleaning and maintenance of the conveying and pressurizing unit 12.
Further, a knob 28 is provided on the hose pipe 34. The knob 28 facilitates the activation and deactivation of the conveying and pressurizing unit 12 and the air compression device 24, and thereby provides remote access of the apparatus 100. The knob is provided on the hose pipe 34 as shown in Figure 5 and Figure 6.
The apparatus 100 also includes at least one contactor and at least one timer 42. The contactor and timer 42 are configured to establish an electro-mechanical connection between the conveying and pressurizing unit 12 and the compression device 24, to thereby facilitate simultaneously activation.
In an embodiment, the knob 28 is provided in proximity of the mixing chamber 16. Thereby, the activation of the knob 28 allows remote actuation of the apparatus 100.
Further, the apparatus 100 is configured with a pressure switch 38. The switch 38 is configured to sense air pressure inside the hose pipe 34. Also, a spray mode is configured on the apparatus 100 to facilitate the spraying of slurry to a desired surface.
In an embodiment, the spray mode facilitates simultaneous activation and deactivation of the conveying and pressurizing unit 12 and the compression device 24.
In another embodiment, the apparatus 100 is provided with a pressure regulator 40 having a dial indicator. The regulator 40 is configured to regulate the pressure of the air compression device 24.
The method of spraying slurry comprises the following steps:
• pouring slurry into the slurry holding chamber 10 of the spraying apparatus 100;
• transferring slurry to the mixing chamber 16 of the nozzle 18 by means of the conveying and pressurizing unit 12;
• compressing air in the air compression device 24 and delivering the compressed air to the operative upstream end of the mixing chamber 16;
• pressurizing the slurry further by means of pressurized air circulated inside the mixing chamber 16; and
• releasing the pressurized slurry from the nozzle 18 of the spraying apparatus 100.
In a preferred embodiment, the spraying apparatus is a horizontal screw-pump conveying apparatus.
In an embodiment, the pressure of slurry in the conveying and pressurizing unit is in the range of 4.5 bar to 6.0 bar.
In another embodiment, the pressure of compressed air delivered to the mixing chamber is in the range of 1.2 bar to 2.0 bar.
Further, the assembly of the conveying and pressurizing unit 12 of the spraying apparatus 100 is such that it offers easiness in assembling and dismantling of the conveying and pressurizing unit and thereby, convenience in maintenance. Thus, it ensures reduction in maintenance cost, and assembly time of the component.
Advantageously, the spraying apparatus 100 is selected such that, all the components of the conveying and pressurizing unit 12 and the air compression device 24 are housed within the specified dimensions of the compact layout.
Further, the apparatus 100 is mounted over a wheel base. The wheel base is having a pair of front wheels 44 and a pair of rear wheels 46. The front wheel 44 is configured to turn or rotate about its axis to enable the turning movement for the spraying apparatus 100. Thus, the wheelbase offers easiness in towing the spraying apparatus 100. Figure 7 illustrates a different schematic view of the spraying apparatus supported over the wheel base.
In an embodiment, slurry is selected from the group consisting of mud, cement, gypsum, putty and any combination thereof.
The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment, but, are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.

TECHNICAL ADVANCES AND ECONOMICAL SIGNIFICANCE
The present disclosure described herein above has several technical advantages including, but not limited to, the realization of the slurry spraying apparatus and the method of spraying slurry, that:
• provides a compact layout of the spraying apparatus, since all the components of the conveying and pressurizing unit 12 and the air compression device 24 are housed within the specified dimensions of the housing;
• provides easy assembly and dis-assembly of the conveying and pressurizing unit, since the stator-rotor assembly and the screw conveyor are removable attached by means of the tie-rods;
• require less space for parking, since all the components are housed in a compact cabinet structure;
• is convenient to transport as the apparatus is mounted over a wheel base, therefore, the apparatus can be easily towed by means any towing van;
• provides better height accessibility for spraying, since the bending provided over the pipe attached with the nozzle offers better vertical height coverage and accessibility to the nozzle;
• allow to alter the flow rate of slurry, since the nozzle is configured with the replaceable cap which is easily attachable and detachable with the nozzle head;
• easy to clean, since the conveying and pressurizing unit is easy to dismantle with the loosening of the tie-rods; and
• reduces the operation and maintenance cost of the apparatus, since minimum number of movable parts are utilized.
The foregoing description of the specific embodiments so fully reveals the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated element, or group of elements, but not the exclusion of any other element, or group of elements.
While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation. ,CLAIMS:WE CLAIM:
1. A slurry spraying apparatus (100), said apparatus (100) comprising:
• a slurry holding chamber (10) configured to receive slurry;
• a conveying and pressurizing unit (12) configured to receive slurry from said holding chamber (10), and further configured to pressurize received slurry;
• a first passage (30) provided operatively downstream of said conveying and pressurizing unit (12), configured to deliver pressurized slurry;
• an air compression device (24) configured to receive air from the surrounding and further configured to compress received air;
• a second passage (36) provided operatively downstream of the compression device (24), configured to deliver pressurized air;
• a mixing chamber (16) provided operatively downstream of said conveying and pressurizing unit (12) and said compression device (24), said mixing chamber (16) configured to receive pressurized slurry and pressurized air from said first passage (30) and said second passage (36) respectively, to thereby increase pressure of pressurized slurry to make sprayable slurry; and
• a nozzle (18) configured to receive the sprayable slurry from said mixing chamber (16) and further configured to spray the sprayable slurry on to a surface in need of the slurry spray.
2. The apparatus (100) as claimed in claim 1, wherein said apparatus (100) includes a housing (50) configured to mount and enclose said conveying and pressurizing unit (12), said slurry holding chamber (10), and the air compression device (24).
3. The apparatus (100) as claimed in claim 2, wherein the housing (50) is provided with a plurality of perforations, said perforations enable said compression device (24) to receive air from the surrounding.
4. The apparatus (100) as claimed in claim 1, wherein said nozzle (18) is operatively mounted downstream to said mixing chamber (16).
5. The apparatus (100) as claimed in claim 1, wherein said mixing chamber (16) is integrally built with said nozzle (18).
6. The apparatus (100) as claimed in claim 1, wherein said conveying and pressurizing unit (12) includes a conveying zone (12a) and a pressurizing zone (12b).
7. The apparatus (100) as claimed in claim 6, wherein said conveying zone (12a) and said pressurizing zone (12b) are in a series configuration.
8. The apparatus (100) as claimed in claim 6, wherein said conveying zone (12a) includes a screw conveyor, said screw conveyor configured to receive slurry from an operative downstream of said slurry holding chamber (10).
9. The apparatus (100) as claimed in claim 6, wherein said pressurizing zone (12b) receive slurry from said conveying zone (12a), said pressurizing zone (12b) configured to pressurize the receive slurry and deliver pressurized slurry operatively downstream through said first passage (30).
10. The apparatus (100) as claimed in claim 9, wherein said pressurizing zone (12b) includes a stator-rotor assembly in communication with said screw conveyor of said conveying zone (12a).
11. The apparatus (100) as claimed in claim 10, wherein said stator-rotor assembly is positionally engaged with said screw conveyor by means of a plurality of tie-rods (26).
12. The apparatus (100) as claimed in claim 10, wherein said stator-rotor assembly is having a rotor (20b) with external helix geometry and a stator (20a) with an internal circular geometry.
13. The apparatus (100) as claimed in claim 12, wherein said rotor (20b) is casted from tool steel hard chrome plating (HCP) and said stator (12a) is casted from high grade nitrile rubber-molded steel.
14. The apparatus (100) as claimed in claim 12, wherein said rotor (20b) rotates inside the circumference of said stator (20a), thereby creates a positive pressure gradient towards the operative downstream of said first passage (30).
15. The apparatus (100) as claimed in claim 14, wherein said first passage (30) protrudes out from said housing (50).
16. The apparatus (100) as claimed in claim 12, wherein a driving member (14) is provided within said apparatus (100), said driving member (14) is configured to drive said screw conveyor.
17. The apparatus (100) as claimed in claim 16, wherein, said driving member (14) is an electric motor.
18. The apparatus (100) as claimed in claim 16, wherein a first end (22a) of said screw conveyor coupled with said driving member (14) and a second end (22b) is mechanically engaged with said rotor (20b), thereby transmitting motion from said driving member (14) to said stator-rotor assembly.
19. The apparatus (100) as claimed in claim 18, wherein said screw conveyor is coupled with the rotor (20b) of said stator-rotor assembly, thereby providing a positive torque for the movement of slurry.
20. The apparatus (100) as claimed in claim 19, wherein said stator-rotor assembly is removably attached with said screw conveyor.
21. The apparatus (100) as claimed in claim 1, wherein said mixing chamber (16) is provided with a first inlet port (16a), and a second inlet port (16b).
22. The apparatus (100) as claimed in claim 21, wherein the first inlet port (16a) is operatively located behind the second inlet port (16b) on said mixing chamber (16).
23. The apparatus (100) as claimed in claim 21, wherein a pipe (32) is provided whose first end (32a) is configured to attach to said first inlet port (16a).
24. The apparatus (100) as claimed in claim 23, wherein the operative front portion of said pipe (32) is bent at pre-determined angle with respect to the operative rear portion of said pipe (32).
25. The apparatus (100) as claimed in claim 23, wherein said pipe (32) is made of anti-corrosive material, said material is selected from mild steel, alloy steel, carbon steel, and aluminium.
26. The apparatus (100) as claimed in claim 23, wherein a second end (32b) of said pipe (32) is in fluid communication with said first passage (30) by means of a delivery tube (52), wherein said delivery tube (52) is configured to carry pressurized slurry.
27. The apparatus (100) as claimed in claim 21, wherein a hose pipe (34) is provided, said hose pipe (34) configured to fluidly communicate said second inlet port (32b) with said second passage (36), said hose pipe (34) further configured to deliver pressurized air.
28. The apparatus (100) as claimed in claim 27, wherein said second passage (36) is protruded out from said housing (50).
29. The apparatus (100) as claimed in claim 1, wherein said nozzle (18) is configured with a replaceable cap, to thereby flow rate of slurry can be varied.
30. The apparatus (100) as claimed in claim 27, wherein a knob (28) is provided on said hose pipe (34) in proximity to said mixing chamber (16), said knob (28) facilitates activation and deactivation of said conveying and pressurizing unit (12) and said air compression device (24), thereby provides remotely access of said apparatus (100).
31. The apparatus (100) as claimed in claim 1, wherein said apparatus (100) includes at least one contactor and at least one timer (42), said contactor and said timer (42) are configured to facilitate an electro-mechanical connection between said conveying and pressurizing unit (12) and said compression device (24), to thereby facilitate simultaneous activation.
32. The apparatus (100) as claimed in claim 1, wherein said apparatus (100) is provided with a pressure switch (38), said switch (38) is configured to sense air pressure inside said hose pipe (34).
33. The apparatus (100) as claimed in claim 1, wherein said apparatus (100) is configured with a spray mode, said spray mode facilitates simultaneous activation of said conveying and pressurizing unit (12) and said compression device (24), to thereby allow pressurized slurry to be sprayed onto the desired surface.
34. The apparatus (100) as claimed in claim 1, wherein said apparatus (100) is provided with a pressure regulator (40), said regulator (40) is configured to regulate the pressure of the compression device (24).
35. The apparatus (100) as claimed in claim 1, wherein said spraying apparatus (100) is a horizontal screw-pump conveying apparatus.
36. The apparatus (100) as claimed in claim 1, wherein slurry is selected from a group consisting of gypsum, mud, cement, putty and any combination thereof.
37. The apparatus (100) as claimed in claim 1, wherein said apparatus (100) is mounted over a wheel base having a pair of front wheel (44) and a pair of rear wheel (46).
38. A method of spraying slurry onto a surface in need thereof, said method comprising the following steps:
• pouring slurry into a slurry holding chamber (10) of a spraying apparatus (100);
• receiving slurry from said holding chamber (10) into a conveying and pressurizing unit (12) and further pressurizing the received slurry;
• transferring pressurized slurry to a mixing chamber (16) of a nozzle (18) by means of said conveying and pressurizing unit (12);
• compressing air in an air compression device (24) and delivering pressurized air to said mixing chamber (16);
• increasing the pressure of pressurized slurry further by means of pressurized air received inside said mixing chamber (16), to thereby making sprayable slurry; and
• releasing sprayable slurry from said nozzle (18) to the surface in need thereof.
39. The method as claimed in claim 38, wherein the flow rate of slurry is being varied by replacing a cap of said nozzle (18).
40. The method as claimed in claim 38, wherein slurry is pressurized during conveyance in said conveying and pressurizing unit (12) to a pressure is in the range of 4.5 bars to 6.0 bars.
41. The method as claimed in claim 38, wherein the pressure of compressed air delivered to said mixing chamber (16) is in the range of 1.2 bars to 2.0 bars.

Dated this 30th day of March, 2022

_______________________________
MOHAN RAJKUMAR DEWAN, IN/PA – 25
of R.K.DEWAN & CO.
Authorized Agent of Applicant

TO,
THE CONTROLLER OF PATENTS
THE PATENT OFFICE, AT MUMBAI