Claims:We Claim:

1. A system (100a/100b/100c/100d/100e) for generating pressure in a leak testing rig (200) having two or more holders (210a, 210b, 210c, 210d), the rig (200) is used to determine assembly efficiency of a wire harness (W1/W2/W3/W4), the wire harness (W1/W2/W3/W4) is having two or more connector ends (W1C1, W1C2) connected to one or more wire segments (Wg1), the rig (200) includes a workbench (210) having two or more holders (210a, 210b, 210c, 210d), each holder (210a/ 210b/ 210c/ 210d) adapted to receive the connector end (W1C1/W1C2) of the wire harness (W1/W2/W3/W4) in an accommodation space (215a/215b/215c/215d) of the holder (210a/ 210b/ 210c/ 210d), two or more pressure sensors (P1,P2,P3, P4) measures quantity of real time pressure between in the holder (210a/ 210b/ 210c/ 210d) and the connector end (W1C1/W1C2) when the connector end (W1C1/W1C2) held in the holder (210a/ 210b/ 210c/ 210d); and based on the details received from the pressure sensors (P1,P2,P3, P4), the assembly efficiency of the wire harness (W1/W2/W3/W4) is determined, the system (100a) comprises:
two or more air pressure generating units (20a/30a, 20b/30b, 20c/30c, 20d/30d), the air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) is adapted to generate pressure therefrom; the air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) is having a delivery end (22a/32a, 22b/32b, 22c/32c, 22d/32d),
two or more operating units (40a/50a, 40b/50b, 40c/50c, 40d/50d), each operating unit (40a/50a/ 40b/50b/ 40c/50c/40d/50d) is connected to a respective air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) of the two or more-air pressure generating units (20a/30a, 20b/30b, 20c/30c, 20d/30d),
wherein, the delivery (22a/32a, 22b/32b, 22c/32c, 22d/32d) end of the air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) is directly connected to a respective holder (210a/ 210b/ 210c/ 210d) of the two or more holders (210a, 210b, 210c, 210d) of the leak testing rig (200) for generating either positive or negative pressure between the holder (210a/ 210b/ 210c/ 210d) and the connected connector end (W1C1, W1C2) of the wire harness (W1/W2/W3/W4) individually when the respective operating unit (40a/50a, 40b/50b, 40c/50c, 40d/50d) of the air pressure generating unit (20a/30a, 20b/30b, 20c/30c, 20d/30d) is operated.

2. The system (100a/100b/100c/100d/100e) as claimed in claim 1, wherein the holder (210a/ 210b/ 210c/ 210d) is having a passage (212a/ 212b/ 212c/ 212d), the passage (212a/ 212b/ 212c/ 212d) includes:
a first end facing towards the accommodation space (215a/215b/215c/215d); and
a second end facing the connected air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d),
wherein the air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) generates the positive pressure by supplying the air from the delivery end (22a/32a, 22b/32b, 22c/32c, 22d/32d) to the wire assembly held in the holder (210a/ 210b/ 210c/ 210d) through the passage (212a/ 212b/ 212c/ 212d); and the air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) generates the negative pressure by suction of the air from the wire assembly held in the holder (210a/ 210b/ 210c/ 210d) through the passage (212a/ 212b/ 212c/ 212d).

3. The system (100a) as claimed in claim 2, wherein the air pressure generating unit (20a/20b/20c/20d) is a turbo machine, the air pressure generating unit (20a/20b/20c/20d) includes a rotor (24a/24b/24c/24d) connected to an electric motor (26a/26b/26c/26d), the electric motor (26a/26b/26c/26d) is connected to the operating unit (40a/50a/ 40b/50b/ 40c/50c/ 40d/50d); wherein the operating unit (40a/50a/ 40b/50b/ 40c/50c/ 40d/50d) actuates the electric motor (26a/26b/26c/26d) to rotate the rotor (24a/24b/24c/24d) in a first direction for generating the positive pressure and the operating unit (40a/50a/ 40b/50b/ 40c/50c/ 40d/50d) actuates the electric motor (26a/26b/26c/26d) to rotate the rotor (24a/24b/24c/24d) in a second direction for generating the negative pressure, wherein the first direction is a clock wise rotation and the second direction is anti-clock wise rotation.

4. The system (100b) as claimed in claim 2, wherein the air pressure generating unit (20a/20b/20c/20d) is a turbo machine, the air pressure generating unit (20a/20b/20c/20d) includes a rotor (24a/24b/24c/24d) connected to an electric motor (26a/26b/26c/26d), the electric motor (26a/26b/26c/26d) is connected to the operating units (40a/50a/ 40b/50b/ 40c/50c/ 40d/50d); wherein the operating unit (40a/50a/ 40b/50b/ 40c/50c/ 40d/50d) actuates the electric motor (26a/26b/26c/26d) to rotate the rotor (24a/24b/24c/24d) in a first direction for generating the positive pressure and the operating unit (40a/50a/ 40b/50b/ 40c/50c/ 40d/50d) actuates the electric motor (26a/26b/26c/26d) to rotate the rotor (24a/24b/24c/24d) in a second direction for generating the negative pressure, wherein the first direction is an anti-clock wise rotation and the second direction is a clock wise rotation.

5. The system (100c) as claimed in claim 2, wherein the air pressure generating unit (30a/30b/30c/30d) is a positive displacement device, the air pressure generating unit (30a/30b/30c/30d) includes a piston (34a/34b/34c/34d) reciprocating in a cylinder (36a/36b/36c/36d) , a first valve (33a, 33b, 33c, 33d) and a second valve (37a, 37b, 37c, 37d); the first valve (33a, 33b, 33c, 33d) and the second valve(37a, 37b, 37c, 37d) are connected to the operating units (40a/50a/ 40b/50b/ 40c/50c/ 40d/50d), the operating unit (40a/50a/ 40b/50b/ 40c/50c/ 40d/50d) actuates the first valve (33a, 33b, 33c, 33d) and the second valve (37a, 37b, 37c, 37d) in a first cycle of operation for generating the positive pressure and the operating units (40a/50a/ 40b/50b/ 40c/50c/ 40d/50d) actuates the first valve (33a, 33b, 33c, 33d) and the second valve (37a, 37b, 37c, 37d) in a second cycle of operation for generating the negative pressure.
6. The system (100d) as claimed in claim 1, wherein the operating unit (40a/ 40b/ 40c/40d) is a switch, the operating unit (40a/ 40b/ 40c/40d) is operated manually.

7. The system (100e) as claimed in claim 1, wherein the operating unit (50a/ 50b/ 50c/50d) includes:
a switch (52a/ 52b/ 52c/52d) connected to the air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d); and
a controller (54a/ 54b/ 54c/54d) connected to the switch (52a/ 52b/ 52c/52d) and a work station (70), the workstation (70) is a computer, or a mobile or an IOT device or an electronic device having a user interface (234), the workstation (230) controls the operations of the switch (52a/ 52b/ 52c/52d) electronically by the operations of the controller (52a/ 52b/ 52c/52d).
, Description:Field of the invention

[0001] The present invention relates to a leak testing rig. More specifically, the present invention relates to a system for generating pressure in a leak testing rig having two or more holders.

Background of the invention:

[0002] Wire harness(es) are typically used to provide electrical connectivity or any such connectivity and transmit signals (control signals) between functional units of devices in an aircraft, a spacecraft, a vehicle, a boat, etc. The wire harness can be used in wide applications such as connecting electronic devices, home appliances, home automation systems, automobiles, construction machinery, and the like. Typically, a wire harness includes one or more wire segments and two or more connector ends. Generally, two or more connector ends connect one or more wire segments.

[0003] Presently, the connector ends are assembled to the wire segments by crimping as described. CN1025393C describes such crimping methods. There should be no air gaps between the connector end and the wire segments for the efficiently assembled wire harness. If air gaps are present between the connector end and the wire segment, the same results in poor assembly efficiency. Generally, this efficiency is referred to as "Assembly efficiency".

[0004] Generally, various leak testing rigs check the air gaps/assembly efficiency between the connector end and the wire segment. The testing rigs includes a pressure-generating tube, and the testing rigs are used to test the leakage inside the connector end. However, the conventional leak testing rig uses a single pressure generating device connected to the connector ends through a tube, resulting in low test reliability due to excessive or insufficient pressure distribution to the connector end.
[0005] KR101513543B1 discloses an apparatus and method for leak testing sealing connector. The apparatus for leak testing includes a plurality of airtight connectors and a plurality of holders. Each airtight connector is connected to the corresponding plurality of holders in the apparatus for leak testing. The apparatus further includes a pressure value measuring unit, a pressure sensor, and a control unit for sequentially checking whether or not leakage occurs in the plurality of airtight connectors. According to the rated reference pressure value, the control unit determines the presence of leakage in the airtight connector. A pressure generating device provides positive or negative pressure to the holders through a plurality of channels. However, a single pressure generating device provides positive or negative pressure to the holders through multiple channels, which may cause machine errors resulting in inconsistent pressure distribution to the airtight connectors and inaccurate leak testing results.

[0006] DE10201610721A1 describes an apparatus. Therein, an apparatus and method for leak testing a component of a wiring harness for a vehicle is proposed, in which a leak test is performed on a component of a wiring harness using a fluid-tight test container. The apparatus also includes a pump for generating a negative test pressure inside the test container and a control device for controlling the pump and monitoring the negative test pressure inside the test container. At the beginning of the leak test, the control device determines an actual pressure deviation between the present test pressure and the output test pressure and compares the actual pressure deviation with a predetermined target pressure deviation. The disadvantage of this is that here, too, a fluid-tight container is used, and a single negative pressure generating device is used.

[0007] Referring to figure 1, the rig (200) is used to determine the assembly efficiency of a wire harness (W1/W2/W3/W4). The wire harness (W1/W2/W3/W4) has two or more connector ends (W1C1/W1C2) connected to one or more wire segments (Wg1). The rig (200) includes a workbench (210) having two or more holders (210a, 210b, 210c, 210d). Each holder (210a/ 210b/ 210c/ 210d) adapted to receive the connector end (W1C1/W1C2) of the wire harness (W1/W2/W3/W4). A pressure generating unit (240) is connected to the holders (210a, 210b, 210c, 210d) to provide positive or negative pressure to the connector ends (W1C1/W1C2) via two or more tubes (241a, 241b, 241c, 241d). Two or more pressure sensors (P1,P2,P3, P4) measures quantity of real-time pressure between the holder (210a/ 210b/ 210c/ 210d) and the connector end (W1C1/W1C2) when the connector end (W1C1/W1C2) held in the holder (210a/ 210b/ 210c/ 210d). based on the data received from the pressure sensors (P1, P2, P3, P4), the assembly efficiency of the wire harness (W1/W2/W3/W4) is determined.

[0008] In the rig (200) for generating pressure, the disadvantage is that only one pressure-generating device (240) is used to provide positive or negative pressure through the tubes (241a, 241b, 241c, 241d) to the connector end (201a,201b) held in the holder (210a/ 210b/ 210c/ 210d). Hence while shifting pressure from positive to negative, the entire set-up (rigs) needs to be changed. Another disadvantage of the existing systems is that there can be a leakage in the tubes (241a, 241b, 241c, 241d), which results in the insufficient pressure distribution to the connector end (201a,201b) held in the holder (210a/ 210b/ 210c/ 210d). Hence the testing results obtained are inaccurate.

[0009] Therefore, there is a need for a system for generating pressure in a leak testing rig, which overcomes the limitations of the prior art.

Objects of the invention

[0010] An object of the present invention is to provide a system for generating pressure in a leak testing rig having two or more holders.

[0011] Another object of the present invention is to provide a system for generating pressure in a leak testing rig with two or more holders, which reduces machine errors.

[0012] Yet another object of the present invention is to provide a system for generating pressure in a leak testing rig with two or more holders. The system allows conducting positive pressure testing and negative pressure testing simultaneously.

Summary of the invention:

[0013] According to the present invention, a system for generating pressure in a leak testing rig having two or more holders is provided. The rig is used to determine the assembly efficiency of a wire harness. The wire harness has two or more connector ends connected to one or more wire segments. The rig includes a workbench and two or more pressure sensors. The workbench has two or more holders. Each holder is adapted to receive the connector end of the wire harness in an accommodation space of the holder. The pressure sensors measure the quantity of real-time pressure between the holder and the connector end when the connector end is held in the holder. Based on the details received from the pressure sensors, the assembly efficiency of the wire harness is determined.

[0014] The system includes two or more air pressure generating units and two or more operating units. Each operating unit is connected to a respective air pressure generating unit of the two or more air pressure generating units. The air pressure generating unit is adapted to generate pressure therefrom. The air pressure generating unit has a delivery end.

[0015] The delivery end of the air pressure generating unit is directly connected to a respective holder of the two or more holders of the leak testing rig for generating either positive or negative pressure between the holder and the connected connector end of the wire harness individually when the respective operating unit of the air pressure generating unit is operated.

[0016] More specifically, the holder is having a passage that includes a first end and a second end. The first end faces towards the accommodation space. The second end faces the connected air pressure generating unit. The air pressure generating unit generates the positive pressure by supplying the air from the delivery to the wire assembly held in the holder through the passage.

[0017] Similarly, the air pressure generating unit generates the negative pressure by suctioning the air from the wire assembly held in the holder through the passage.

[0018] In an embodiment of the present invention, the air pressure generating unit is a turbomachine. The air pressure generating unit includes a rotor connected to an electric motor. The electric motor is connected to the operating unit. The operating unit actuates the electric motor (26a/26b/26c/26d) to rotate the rotor in the first direction for generating positive pressure. Similarly, the operating unit actuates the electric motor to rotate the rotor in the second direction to generate negative pressure. The first direction is a clockwise rotation, and the second direction is an anti-clockwise rotation. In an alternative embodiment, the first direction is an anti-clockwise rotation, and the second direction is a clockwise rotation.

[0019] In one more embodiment of the invention, the air pressure generating unit is a positive displacement device. The air pressure generating unit includes a piston reciprocating in a cylinder, a first valve, and a second valve. The first valve and the second valve are connected to the operating units. The operating units actuate the first valve and the second valve in the first cycle of operation to generate the positive pressure. The operating units actuate the first valve and the second valve in a second cycle of operation to generate the negative pressure.

[0020] In an embodiment of the present invention, the operating unit is a switch. The operating unit is operated manually.

[0021] In one more embodiment, the operating unit includes a switch and a controller. The switch is connected to the air pressure generating unit. The controller is connected to the switch and a workstation. The workstation is a computer, a mobile or an IOT device, or an electronic device having a user interface. The workstation controls the operations of the switch electronically by the operations of the controller.

Brief description of drawings:

[0022] The advantages and features of the present invention will be understood better with reference to the following detailed description and claims taken in conjunction with the accompanying drawings, wherein like elements are identified with like symbols, and in which:

[0023] Figure 1 a schematic view of an existing system for generating pressure in a leak testing rig having two or more holders;

[0024] Figure 2 shows a schematic view of a system for generating pressure in a leak testing rig having two or more holders in accordance with the present invention;

[0025] Figure 3a shows a schematic view of an embodiment of a system for generating positive pressure in a leak testing rig having two or more holders in accordance with the present invention;

[0026] Figure 3b shows a schematic view of the system shown in figure 3a wherein the system is generating negative pressure;

[0027] Figure 4a shows a schematic view of one more embodiment of a system for generating positive pressure in a leak testing rig having two or more holders in accordance with the present invention;

[0028] Figure 4b shows a schematic view of a system shown in figure 4a wherein the system is generating negative pressure;

[0029] Figure 5a shows a schematic view of a system for generating positive pressure in a leak testing rig having two or more holders in accordance with the present invention;

[0030] Figure 5b shows a schematic view of a system shown in figure 5a wherein the system is generating negative pressure;

[0031] Figure 6 shows a schematic view of an embodiment of a system for generating pressure in a leak testing rig having two or more holders in accordance with the present invention; and

[0032] Figure 7 is a schematic view of one or more embodiment of a system for generating pressure in a leak testing rig having two or more holders in accordance with the present invention;

Detailed description of the invention

[0033] An embodiment of this invention, illustrating its features, will now be described in detail. The words "comprising," "having," "containing," and "including," and other forms thereof are intended to be equivalent in meaning and be open-ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items.
[0034] The terms “first,” “second,” and the like, herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another, and the terms “a” and “an” herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced items.

[0035] The disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms.

[0036] The present invention provides a system for generating pressure in a leak testing rig having two or more holders. Further, the system reduces machine errors. Furthermore, the system allows conducting positive pressure testing and negative pressure testing simultaneously on wire harnesses in a leak test rig.

[0037] The rig (200) is used to determine the assembly efficiency of a wire harness (W1/W2/W3/W4). The wire harness (W1/W2/W3/W4) is also known as a cable harness, or wiring assembly can be a grouping of wires, cables, or subassemblies designed to transmit signals or electrical power. The wire harness (W1/W2/W3/W4) has two or more connector ends (W1C1, W1C2) connected to one or more wire segments (Wg1). The Connector end (W1C1, W1C2) is an electro-mechanical device that connects the wire harnesses (W1/W2/W3/W4) to a power source or an electric circuit.

[0038] The rig (200) includes a workbench (210) and two or more pressure sensors (P1, P2, P3, P4). The workbench (210) has two or more holders (210a, 210b, 210c, 210d). Each holder (210a/ 210b/ 210c/ 210d) is adapted to receive the connector end (W1C1/W1C2) of the wire harness (W1/W2/W3/W4) in an accommodation space (215a/215b/215c/215d) of the holder (210a/ 210b/ 210c/ 210d). The holder (210a/ 210b/ 210c/ 210d) includes a latching arrangement (900). A latching force is applied on the outer surface of the connector end (W1C1/W1C2) by a latching member (not shown) to accommodate the connector end (W1C1/W1C2) of a wire harness (W1/W2/W3/W4).
[0039] The latching arrangement (900) includes the holder (210a/ 210b/ 210c/ 210d) and a latching unit (not shown in figures). When the connector end (W1C1/W1C2) is accommodated inside the holder (210a/ 210b/ 210c/ 210d) in the accommodation space (215a/215b/215c/215d), the latching member (not shown) is moved to the operating position to have physical contact with the connector end (W1C1/W1C2). Thus, the physical contact will restrict the movements of the connector end (W1C1/W1C2) with the holder (210a/ 210b/ 210c/ 210d), thereby latching the wire harness (W1/W2/W3/W4) with the holder (210a/ 210b/ 210c/ 210d).

[0040] The pressure sensors (P1, P2, P3, P4) measure the quantity of real-time pressure between the holder (210a/ 210b/ 210c/ 210d) and the connector end (W1C1/W1C2). When the connector end (W1C1/W1C2) held in the holder (210a/ 210b/ 210c/ 210d). The pressure sensor (P1, P2, P3, P4) has a pressure-sensitive element and electronic components that can measure the input pressure and convert the data to an electrical output signal. Based on the details received from the pressure sensors (P1, P2, P3, P4), the assembly efficiency of the wire harness (W1/W2/W3/W4) is determined.

[0041] Referring now to figure 2, a schematic view of a system (100a/100b/100c/100d/100e) for generating pressure in a leak testing rig (200) having two or more holders (210a, 210b, 210c, 210d) in accordance with the present invention is illustrated. The system (100a/100b/100c/100d/100e) includes two or more air pressure generating units (20a/30a, 20b/30b, 20c/30c, 20d/30d) and two or more operating units (40a/50a, 40b/50b, 40c/50c, 40d/50d). The air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) is adapted to generate pressure therefrom. Here, the pressure can be referred as the force per unit area exerted by the air. The pressure generated can be relative to the atmospheric pressure. The air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) may include a regulator (not shown) for controlling the pressure of the generated air pressure. The air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) is having a delivery end (22a/32a, 22b/32b, 22c/32c, 22d/32d).

[0042] The regulator (not shown) can control the magnitude of the positive or negative pressure. The magnitude of the positive or negative pressure generated between the holder (210a/ 210b/ 210c/ 210d) and the connected connector end (W1C1, W1C2) of the wire harness (W1/W2/W3/W4) should be less than the latching force exerted on the connector end (W1C1, W1C2) of the wire harness (W1/W2/W3/W4). So that the connector end (W1C1, W1C2) of the wire harness (W1/W2/W3/W4) will be locked within the holder (210a/ 210b/ 210c/ 210d), restricting the relative movement of the connector end (W1C1, W1C2) with the holder (210a/ 210b/ 210c/ 210d).

[0043] In this system (100a/100b/100c/100d/100e) each operating unit (40a/50a/ 40b/50b/ 40c/50c/40d/50d) is connected to a respective air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) of the two or more-air pressure generating units (20a/30a, 20b/30b, 20c/30c, 20d/30d).

[0044] In the present embodiment (100a), the rig (200) includes 4 wire harnesses (W1, W2, W3, W4). In alternative embodiments, the number of wire harnesses (W1/W2/W3/W4) can be varied based on actual application/testing. The number of holders (210a, 210b, 210c, 210d) depends on the number of connector ends (W1C1/W1C2). The number of air pressure generating units (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) depends on number of holders (210a, 210b, 210c, 210d).

[0045] The operating unit (40a/50a/ 40b/50b/ 40c/50c/40d/50d) can be a manually operable switch (Figure 6). The operating unit (40a/50a/ 40b/50b/ 40c/50c/40d/50d) can be switched between ON and OFF position. The operating unit (40a/50a/ 40b/50b/ 40c/50c/40d/50d) can be adapted to operate a positive or negative pressure generated from the air pressure generating unit (20a/30a, 20b/30b, 20c/30c, 20d/30d).

[0046] In the embodiment (100a/100b/100c/100d/100e) of the present invention the delivery end (22a/32a, 22b/32b, 22c/32c, 22d/32d) of the air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) is directly connected to a respective holder (210a/ 210b/ 210c/ 210d) of the two or more holders (210a, 210b, 210c, 210d) of the leak testing rig (200) for generating either positive or negative pressure between the holder (210a/ 210b/ 210c/ 210d) and the connected connector end (W1C1, W1C2) of the wire harness (W1/W2/W3/W4) individually when the respective operating unit (40a/50a, 40b/50b, 40c/50c, 40d/50d) of the air pressure generating unit (20a/30a, 20b/30b, 20c/30c, 20d/30d) is operated between ON and OFF position

[0047] The holder (210a/ 210b/ 210c/ 210d) disclosed in the present invention is having a passage (212a/ 212b/ 212c/ 212d). The passage (212a/ 212b/ 212c/ 212d) can be a substantially cylindrical shaped hollow portion having open ends. The passage (212a/ 212b/ 212c/ 212d) can be used to pump or transfer the positive or negative air pressure generated from the air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d). The holder (210a/ 210b/ 210c/ 210d) can be a socket. The passage (212a/ 212b/ 212c/ 212d) includes a first end (700a) and a second end (700b). The first end (700a) is facing towards the accommodation space (215a/215b/215c/215d). The second end (700b) is facing the connected air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d).

[0048] While performing operation, the air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) generates the positive pressure ( figure 3a, 4a, 5a) by supplying the air from the delivery end (22a/32a, 22b/32b, 22c/32c, 22d/32d) to the wire assembly held in the holder (210a/ 210b/ 210c/ 210d) through the passage (212a/ 212b/ 212c/ 212d).

[0049] Similarly, the air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) generates the negative pressure (figure 3b, 4b, 5b) by suction of the air from the wire assembly held in the holder (210a/ 210b/ 210c/ 210d) through the passage (212a/ 212b/ 212c/ 212d). For example, when the connector end (W1C1/W1C2) is held in the holder (210a/ 210b/ 210c/ 210d), the positive pressure or negative pressure generated from air pressure generating unit (20a/30a/ 20b/30b/ 20c/30c/ 20d/30d) is supplied between the connector end (W1C1/W1C2) and the holder (210a/ 210b/ 210c/ 210d) through the passage (212a/ 212b/ 212c/ 212d).

[0050] Referring now to figure 3a, a schematic view of a system (100a) for generating pressure using a turbomachine is a leak testing rig (200) having two or more holders (210a) in accordance with the present invention is illustrated. In this embodiment (100a), the air pressure generating unit (20a1) is a turbomachine. The air pressure generating unit (20a1) includes a rotor (24a1) connected to an electric motor (26a1). The electric motor (26a) is connected to the operating unit (40a/50a).

[0051] According to figure 3a, in an embodiment (100a), the operating unit (40a/50a) actuates the electric motor (26a) to rotate the rotor (24a1) in a first direction (500a) for generating the positive pressure. The first direction (500a) is a clockwise rotation. For example, when the operating unit (40a/50a) actuates the electric motor (26a) to rotate the rotor (24a1) in a clockwise direction, the airflow is transferred through the passage (212a) towards the accommodation space (215a) of the holder (210a). Thereby the positive pressure is generated between the connector end (W1C1/W1C2) and the holder (210a) of the wire harness (W1).

[0052] According to figure 3b, in the embodiment (100a), the operating unit (40a/50a) actuates the electric motor (26a) to rotate the rotor (24a1) in the second direction (500b) for generating the negative pressure. The second direction (500b) is anti-clockwise rotation. For example, when the operating unit (40a/50a) actuates the electric motor (26a) to rotate the rotor (24a1) in the anti-clockwise direction, the air present in the accommodation space (215a) of the holder (210a) is pumped out through the passage (212a). Thereby, the negative pressure is generated between the connector end (W1C1/W1C2) and the holder (210a) of the wire harness (W1).

[0053] Similarly, the pressure generating unit (20b1, 20c1, 20d1) has the same construction of functional elements such as the electric motor (26b, 26c, 26d), the rotor (24b1, 24c1, 24d1), arrangement of elements, functions of the elements as of the pressure generating unit (20a1). The operating unit (40b/50b) is connected (26b), the operating unit (40c/50c) is connected to (26c), the operating unit (40d/50d) is connected to (26d), for generating the positive or negative pressure from the respective air pressure generating units (20b1, 20c1, 20d1).

[0054] Referring now to figures (4a, 4b), an alternative embodiment (100b) for generating positive or negative pressure using a turbomachine is illustrated. In this embodiment (100b), the first direction is an anti-clockwise rotation (figure 4a) for generating positive pressure from the air pressure generating unit. (20a2) and the second direction is a clockwise rotation (figure 4b) for generating negative pressure from the air pressure generating unit (20a2). The geometric dimensions/ design of the rotor (24a2) is altered to generate positive pressure or negative pressure between the connector end (W1C1/W1C2) and the holder (210a) of the wire harness (W1), which is obvious to a person skilled in the art.

[0055] As a result, the system (100a, 100b) enables the user to perform a leak test on each connector end (W1C1/W1C2) of the wire harness (W1) contained in the holder (210a) by simultaneously applying positive and negative pressure to each connector end (W1C1/W1C2). For example, the user can provide positive air pressure to one connector end (W1C1/W1C2) held in the holder (210a), and negative air pressure to the other connector end (W1C1/W1C2) held in the holder (210a). The system (100a, 100b) allows the user to simultaneously perform both tasks in the test rig (200).
[0056] Referring now to figure 5a, a schematic view of a system (100c) for generating pressure using a positive displacement device in a leak testing rig (200) having two or more holders (210a, 210b, 210c,210d) in accordance with the present invention is illustrated. In an embodiment (100c), the air pressure generating unit (30a) is a positive displacement device. The positive displacement device (30a) can be a gear pump or a screw pump. The air pressure generating unit (30a) includes a reservoir (800) to store the required amount of air for generating positive or negative air pressure, a piston (34a) reciprocating in a cylinder (36a), a first valve (33a), and a second valve (37a). The first valve (33a) and the second valve (37a) are connected to the operating units (40a/50a).

[0057] Similarly, the pressure generating unit (30b, 30c, 30d) are having same construction of functional elements such as a piston (34b, 34c, 34d) reciprocating in a cylinder (36b,36c, 36d), a first valve (33b,33c, 33d) and a second valve (37b, 37c, 37d), the arrangement of elements, functions of the elements as of the pressure generating unit (30a).

[0058] While operating according to figure 5a, in this embodiment (100c), the first valve (33a) and the second valve (37a) are open only for a part of a time. The operating units (40a/50a) actuate the first valve (33a) and the second valve (37a) in a first cycle of operation (80a) for generating the positive pressure. In the first cycle of operation (80a), when the operating unit (40a/50a) actuates the first valve (33a) and the second valve (37a), the air present in the reservoir (800) is transferred into the positive displacement device (30a) and transferred to the accommodation space (215a) of the holder (210a) through the passage (212a) due to reciprocating motion of the piston (34a) and cumulative valve operations of the first valve (33a) and second valve (37a) in the first cycle of operation (80a).

[0059] According to figure 5b, the operating unit (40a/50a) actuates the first valve (33a) and the second valve (37a) in a second cycle of operation (80b) for generating the negative pressure. In the second cycle of operation (80b), when the operating unit (40a/50a) actuates the first valve (33a) and the second valve (37a), the air present in the accommodation space (215a) of the holder (210a) is drawn into the positive displacement device (30a) through the passage (212a) and transferred to the reservoir of the positive displacement device (30a) due to reciprocating motion of the piston (34a).

[0060] Referring now to figure 6a, a schematic view of an operating unit (40a) is illustrated. In this embodiment (100d) of the present invention, the operating unit (40a) is a switch (60a), the operating unit (40a) is operated manually. The switch (60a) used here can be a toggle switch or a push-button switch. The switch (60a) can be operated between ON and OFF positions. Additionally, a regulator (not shown) can be used to control the positive or negative air pressure, which has to be applied between the connector end (W1C1/W1C2) and the holder (210a) of the wire harness (W1). The regulator can be a step type regulator with two or more control settings. While operating, the user can control the amount of positive or negative air pressure to be supplied between the connector end (W1C1/W1C2) and the holder (210a) of the wire harness (W1).

[0061] Similarly, the operating units (40b,40c,40d) have same constructional and functional elements such as the switch (60b,60c,60d). Hence the operating unit (40b,40c,40d) and the switch (60b,60c,60d) functions the same as that of the operating unit (40a).

[0062] Referring now to figure 7, a schematic view of one more embodiment of a system (100e) in accordance with the present invention is illustrated. In this, the system (100e), the operating unit (50a), includes a switch (52a) and a controller (54a). The controller (42a) can be operated manually. The switch (52a) is connected to the air pressure generating unit (20a/30a). The controller (54a) is connected to the switch (52a) and a workstation (70). The workstation (70) is a computer, a mobile or an IOT device or an electronic device having a user interface (234). Through the user interface, a user can control the controller's operations. The user interface can be keys, switches, IoT (Internet of Things) user interface, microphone, touch screen. The workstation (70) controls the operations of the switch (52a) electronically by the operations of the controller (52a).

[0063] Similarly, the operating unit (50b, 50c, 50d) includes the switch (52b, 52c, 52d) and the controller (54b,54c,54d) respectively. The switch (52b, 52c, 52d) is connected to the air pressure generating unit (20b/30b,20c/30c, 20d/30d) respectively. The controller (54b,54c,54d) is connected to the switch (52b,52c,52d) in the respective order and the workstation (70).

[0064] Therefore, the present invention lets a user perform multiple tests on a connector end (W1C1/W1C2) of the wire harness (W1/W2/W3/W4) in real-time. The system (100a/100b/100c/100d/100e) described in the present invention allows the user to change the positive pressure to the negative pressure and vice versa while performing the leak test on the connector end (W1C1/W1C2) of the wire harness (W1/W2/W3/W4).

[0065] For example, the user can supply the positive pressure between the connector end (W1C1) and the holder (210a) of the wire harness (W1) for testing the leakage present in the wire harness (W1). Simultaneously, the user can supply the negative pressure between the connector end (W2C2) and the holder (210b) of the wire harness (W2) for testing leakage present in the wire harness (W2). Also, the system (100a, 100b, 100c, 100d, 100e) allows the user to carry out both the positive and the negative pressure tests on the wire harness (W1).

[0066] Therefore, the system (100a, 100b, 100c, 100d, 100e) allows the user to perform a leak test on the individual connector end (W1C1/W1C2) of the wire harness (W1/W2/W3/W4) held in the holder (210a/ 210b/ 210c/ 210d) by providing positive pressure and negative pressure simultaneously to each of the connector end (W1C1/W1C2). For example, the user can provide positive air pressure to one connector end (W1C1/W1C2) held in the holder (210a/ 210b/ 210c/ 210d) and negative air pressure to another connector held in another holder (210a/ 210b/ 210c/ 210d). The system (100a, 100b, 100c, 100d, 100e) allows the user to perform both operations in the test rig (200) at one time (real-time).

[0067] As described in the present invention, the system (100a, 100b, 100c, 100d, 100e) allows the user to perform a leak test on the connector end (W1C1/W1C2) of the wire harness (W1/W2/W3/W4) by using individual air pressure generating unit to provide the positive or negative test pressure between the respective connector end (W1C1/W1C2) and the holder (210a/ 210b/ 210c/ 210d) of the wire harness (W1/W2/W3/W4). This reduces the machine errors that can cause due to the complex structure and lengthy operation of the system.

[0068] 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. 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 spirit or scope of the claims of the present invention. The embodiments were chosen and described to explain the principles of the present invention best and its practical application, thereby enabling others skilled in the art to best utilize the present invention and various embodiments with various modifications suited to the particular use contemplated.