DESC:TECHNICAL FIELD
[001] The present invention relates to a vaporizer, be specifically related to a kind of LPG vaporizer.
BACKGROUND ART
[002] Liquefied Petroleum Gas or LPG is a mixture of hydrocarbons, generally, propane and butane. LPG has continued to gain popularity as a fuel source due to abundant supplies, low-cost and an environmentally friendly profile compared to other fuels. These benefits in addition to its ease of use have made propane a desirable fuel for heating applications and industrial thermal processes.
[003] LPG vapour is much denser than atmospheric air on earth and can easily catch fire. When exposed to air, LPG can be extremely harmful. Any leakage of the gas during storage or transportation can be risky, hence it is stored and transported in the liquid form. The gas is generally stored under pressure in liquid form in a container. For safer consumption of LPG, its liquid form is converted into the gaseous form, only when needed using an LPG vaporiser at a specific rate. The vaporisation rate differs depending on the gas consuming equipment/s and the amount of vapour required to serve the purpose for the desired application.
[004] The function of the Vaporiser unit is to safely transform LPG in a controlled manner from its liquid phase into a gaseous phase. This equipment is used if the gas quantity to be vaporised is higher than the normal discharge flow rate of LPG from the tank or cylinder the LPG is filled in. For the continuous, steady operation of your application, the amount of LPG the consuming equipment draws from the storage tank must be matched by the rate of vaporisation. However, because natural vaporisation rate has its limits due to ambient temperature and storage size of the cylinder, the natural vaporisation cannot fulfil the demands of the burners consuming the LPG.
[005] Each piece of LPG consuming equipment has its own requirements as to the amount of vapour it needs to run properly. For heavier commercial and industrial applications for example, which are generally more demanding LPG consuming equipment, natural vaporisation is often insufficient. It simply cannot provide the amount of vapour demanded by these larger applications. If the equipment is not getting the vapour pressure it needs, it may deliver less heat than the application requires, or—even more damaging—shut down the operation entirely. For such applications, adding a vaporiser for ‘artificially’ increase vaporisation is a reliable solution.
[006] Most commonly used LPG vaporiser is water-bath type vaporizer. This vaporiser unit consists of a stainless-steel coil which carries the liquid LPG, immersed in a hot water bath. Electrical heaters of specified capacity are provided to heat the water. Liquid LPG enters the coil at bottom and gets vaporised as it travels through it and the LPG vapours leaves at the top. However, this type of vaporizer is bulky in size and requires liquid as heat transfer medium.
[007] Accordingly, there exists a need for LPG vaporizer that eliminates the need of liquid heat transfer medium for smaller areas where space is a big constraint.
OBJECT OF THE INVENTION
[008] An object of the present invention is to provide a dry type LPG vaporizer which eliminates need of liquid hear transfer medium.
[009] Another object of the present invention is to provide compact LPG vaporizer that allows it to be installed in smaller areas where space is a big constraint.
SUMMARY OF THE INVENTION
[0010] The present invention relates to a controlled LPG vaporizer that ensures safe and efficient conversion of liquid LPG to its gaseous form prior to combustion or other usage. The system incorporates a heating coil in thermal contact with a metal core, a first thermostat (T1) set at 100 °C to prevent overheating by cutting off the heating coil above the upper temperature limit, a second thermostat (T2) set at 75 °C to maintain heating when the temperature falls below this threshold, one or more activation thermostats (T3, T4) set at 60 °C to trigger LPG admission, and a solenoid valve controlling the flow of liquid LPG into an LPG coil in contact with the heated metal core.
[0011] During operation, if the core temperature is below 75 °C, T1 and T2 allow current to flow to the heating coil. As the core warms, T3 or T4 detects when the temperature reaches 60 °C and signals the solenoid valve to open, allowing liquid LPG to enter the LPG coil. The core’s heat instantly vaporizes the LPG due to the temperature being above its boiling point. This design achieves rapid vaporization, minimizes energy wastage, and incorporates safety mechanisms to prevent overheating or premature gas release.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Reference will be made to embodiments of the invention, examples of which may be illustrated in the accompanying figures. These figures are intended to be illustrative, not limiting. Although the invention is generally described in the context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
[0013] The objects and advantages of the present invention will become apparent when the disclosure is read in conjunction with the following figures, wherein
[0014] Figure 1 illustrates an overview of the dry type LPG vaporizer, in accordance with the present invention;
[0015] Figure 2 illustrates sectional views of the dry type LPG vaporizer, in accordance with the present invention;
[0016] Figure 3 illustrates an exploded view of the dry type LPG vaporizer, in accordance with the present invention;
[0017] Figure 4 illustrates a half sectional view of the dry type LPG vaporizer, in accordance with the present invention;
[0018] Figure 5 illustrates an offset sectional view of the dry type LPG vaporizer, in accordance with the present invention; and
[0019] Figure 6 illustrates engineering drawings of the dry type LPG vaporizer, in accordance with the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0020] The embodiments herein provide a dry type LPG vaporizer.
[0021] Throughout this application, with respect to all reasonable derivatives of such terms, and unless otherwise specified (and/or unless the particular context clearly dictates otherwise), each usage of:
“a” or “an” is meant to read as “at least one”,
“the” is meant to be read as “the at least one.”
[0022] References in the specification to “one embodiment” or “an embodiment” mean that a particular feature, structure, characteristic, or function described in connection with the embodiment is included in at least one embodiment. The appearances of the phrase “in one embodiment” in various places in the specification are not necessarily all referring to the same embodiment.
[0023] Hereinafter, embodiments will be described in detail. For clarity of the description, known constructions and functions will be omitted.
[0024] The present invention is illustrated with reference to the accompanying drawings, throughout which reference numbers indicate corresponding parts in the various figures. These reference numbers are shown in brackets in the following description.
[0025] In one of the exemplary embodiments of the present invention, the dry type LPG vaporizer (100) comprises a body (1), a coil cover (2), at least two LPG coils (3), a heating coil (4), a terminal box (5), a cover (6), a pressure regulating valve (7), a solenoid valve (8), a plurality of glands (9).
[0026] The body (1) is a housing for encasing the coil cover (2) therein. The coil cover (2) is a box for accommodating the LPG coil (3) and the heating coil (4) therein. Further, the coil cover (2) is filled with metal core material. More specifically, the coil cover (2) is filled with aluminium alloy called LM-27. The heating coil (4) is positioned between two LPG coils (3). Additionally, the LPG coil (3) and the heating coil (4) is submersed in the metal core inside the coil cover (2). The metal alloy provides good thermal conductivity and formability for heat transfer. Additionally, the below table: 1 shows physical properties of the metal alloy for better understanding of the material significance.

Table: 1 Chemical Composition of LM-27
[0027] The terminal box (5) is mounted on the coil cover (2). The terminal box (5) is electrically connected with the heating coil (4). The terminal box (5) is encased in cover (6). The heating coil (4) is positioned between the LPG coils (3). The LPG coils (3) carry the liquid LPG which comes through an inlet pipe. The terminal box (5) includes a plurality of thermostats (T1, T2, T3, T4, T5, T6).
[0028] The solenoid valve(s) (8) is provided on the inlet pipe to control inlet of the liquid LPG. The solenoid valve(s) (8) is electrically connected with a thermostat (T3 OR T4).
[0029] The thermostats (T1, T2, T3, T4, T5, T6) are used for sensing the temperature of the metal core and sending the signal to the solenoid valve (8) as soon as the temperature reaches the predetermined threshold (in this case 60°C). The thermostats (T1 & T2) regulate the overheating during heating up, vaporizing operation. Additionally, the thermostats (T1 & T2) protect the vaporiser from overheating. More specifically, the thermostats (T1 & T2) maintain the minimal temperature above the limit required for safe and complete vaporising stipulated in technical regulations. The solenoid valve (8) is connected to the thermostat (T3 and/or T4) through internal circuits for operating as per the temperature of the metal core. When the temperature of the metal core reaches 60° C, the thermostat (T3 and/or T4) gives signal to the solenoid valve (8) and it opens the flow of liquid LPG into the LPG Vaporizer (100) and shutoff if the temperature falls under 50°C. The hot metal core transfers the heat to the LPG coil (4), which converts the liquid LPG to its vapor form.
[0030] The thermostat (T5) is an operational temperature switch, and the thermostat (T6) is a temperature limiter. The operational temperature switch (T5) keeps the working temperature of the LPG vaporiser (100) in limits of +60°C up to 75°C. The temperature limiter (T6) protects the LPG vaporiser (100) against overload / overheating in case of a failure of the operational temperature switch. When reaching a temperature of 100°C, the temperature limiter (T6) shuts the heating current down, closes the solenoid valve(s) and interrupts the supply of LPG and thus is getting locked mechanically.
[0031] The pressure regulating valve (7) is a safety relief valve connected to the outlet pipe of the LPG vaporiser (100). The operating pressure exceeding of the LPG vaporiser (100) is avoided by the safety relief valve in the outlet pipe of the LPG vaporiser (100). The operating pressure is avoided through the backward open construction form of the pressure regulating valve (7) where an overpressure available in the aggregate can release into the direction of the storage tank. In an exemplary embodiment, the pressure regulating valve (7) is a mechanically operated device. In case the pressure of the LPG vapor increases above the necessary output pressure (17-25 Bar), it releases LPG into the atmosphere and maintains required pressure. It doesn’t need any electrical input for operation.
[0032] In an exemplary embodiment, initially the temperature of the metal core filled in the coil cover (2) is equal to the ambient temperature. When the LPG vaporizer (100) is switched on, the heating coil (4) starts heating up. The thermostat (T1) set at 100° C and the thermostat (T2) set at 75° C are normally closed type which checks the temperature of the metal core and if it is below 75° C then allows the current to pass on to the heating coil (4). The heating coil (4) heats the metal core and upon reaching the temperature to 60° C, the thermostat (T3 or T4) sends the signal to the solenoid valve (8) and opens the liquid LPG flow in the LPG coil (3). As temperature of the metal core is higher than boiling point of the LPG, it converts the liquid LPG into its vapor form inside the LPG coil (3). As soon as the temperature of the metal core reaches up to 75° C, the terminal box (5) will cut the supply to the heating coil (3). In case the thermostat (T2-75° C) fails, and the heating coil (3) overheats the metal core, the thermostat (T1-100° C) helps to cut off the supply to the heating coil (3). Further, the supply of the liquid LPG cuts through the solenoid valve (8), when temperature of the metal core goes below 50° C. The thermostats (T3, T4) are of normally open type, when temperature exceeds 60° C it closes the loop and starts the supply to the solenoid valve (8). The solenoid valve (8) opens or closes the supply of liquid LPG as per the temperature of the metal core.
[0033] The plurality of glands (9) are used for securely attaching and sealing the end of an electrical connection between the terminal box (5) and the heating coil (4). In an exemplary embodiment, the glands (9) are used to securely attach the solenoid valve (8) and the pressure regulating valve (7) on the inlet pipe and the outlet pipe respectively.
[0034] This design achieves rapid vaporization, minimizes energy wastage, and incorporates safety mechanisms to prevent overheating or premature gas release.
ADVANTAGES OF THE INVENTION
1. The present invention provides dry type LPG vaporizer with improved efficiency of the rate of vaporisation.
2. The present invention eliminated need of liquid heat transfer medium in LPG vaporizer.
3. The present invention provides a compact design of LPG vaporizer.
[0021] The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application, to thereby enable others skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omission and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the scope of the present invention.
,CLAIMS:We Claim:

1. A dry type Liquified Petroleum Gas (LPG) vaporizer (100) comprising:
metal core filled in a coil cover (2);
at least two LPG coils (3) submersed in metal core within the coil cover (2);
a heating coil (4) positioned between the two LPG coils (3) submersing in metal core;
a terminal box (5) accommodating a plurality of thermostats (T1-T6);
a solenoid valve (8) on an inlet pipe electrically connected with at least one or both of the thermostats T3 and T4 for controlling inlet of the liquid LPG; and
a pressure regulating valve (7) on an outlet pipe,
wherein, when the metal core temperature is below 75 °C, thermostat T1 and T2 allow current to flow to the heating coil (4) to heat the metal core,
wherein, upon detecting the metal core temperature reaching 60 °C, thermostat T3 or T4 sends a signal to actuate the solenoid valve (8) to admit liquid LPG into the LPG coil for vaporization.
2. The dry type LPG vaporizer (100) as claimed in claim 1, wherein thermostat T1 is configured to interrupt current to the heating coil when the metal core temperature reaches or exceeds 100 °C.
3. The dry type LPG vaporizer (100) as claimed in claim 1, wherein thermostat T2 is configured to allow current to the heating coil when the metal core temperature drops below 75 °C.
4. The dry type LPG vaporizer (100) as claimed in claim 1, wherein thermostat T5 is configured to maintain working temperature of metal core from 60°C up to 75°C.
5. The dry type LPG vaporizer (100) as claimed in claim 1, wherein thermostat T6 is configured to prevent overheating in case of a failure of the thermostat T5 by shutting the heating current down, closing the solenoid valve(s) and interrupting the supply of LPG when the metal core temperature reaches or exceeds 100 °C.
6. The dry type LPG vaporizer (100) as claimed in claim 1, wherein metal core is an aluminium alloy material.
7. The dry type LPG vaporizer (100) as claimed in claim 1, further comprising a plurality of glands (9) for interconnecting thermostat T1, T2, T3, T4, T5, T6, the heating coil (4), and the solenoid valve (8) such that LPG flow is enabled only after the metal core reaches the predetermined temperature threshold.
8. The dry type LPG vaporizer (100) as claimed in claim 1, wherein the pressure regulating valve (7) releases LPG into the atmosphere in case of increased output pressure of the LPG vapor and maintains required pressure.

Dated this on 25th day of August 2025