Air tightness detection device for expansion valve of air conditioner

Abstract

The utility model relates to an air tightness detection device for an air conditioner expansion valve, and relates to the technical field of expansion valve manufacturing, the air tightness detection device comprises a rack, an expansion valve is placed on the rack, and the rack is provided with a test mechanism used for detecting the air tightness of the expansion valve. The test air pipe is connected with the expansion valve through the first connecting assembly, the pressure measuring pipe is connected with the expansion valve through the second connecting assembly, the test air pipe is ventilated to inject air into the expansion valve, and the air pressure in the expansion valve is increased to enable the pressure sensor on the pressure measuring pipe to be pressed; after the pressure sensor is pressed, a pressure signal is transmitted to the pressure gauge through the pressure measuring pipe, the pressure gauge displays the internal air pressure of the expansion valve, a worker can judge the air tightness state of the expansion valve by observing the reading of the pressure gauge, the operation is more visual and accurate, and the working intensity is lower.

Description

Technical Field

[0001] The present application relates to the technical field of expansion valve manufacturing, and in particular to an air tightness detection device for an air-conditioning expansion valve. Background Art

[0002] The air conditioning expansion valve is a key component in the air conditioning refrigeration system. Its main function is to convert medium-temperature and high-pressure liquid refrigerant into low-temperature and low-pressure wet steam through throttling. This process is crucial for the evaporation and heat absorption of the refrigerant in the evaporator, thereby achieving the refrigeration effect of the air conditioner. The expansion valve can adjust the flow of the refrigerant according to the change of superheat at the end of the evaporator, ensure the full utilization of the evaporator, avoid excessive or insufficient refrigerant, and prevent the compressor from knocking and other faults.

[0003] In the related art, reference may be made to the Chinese utility model patent with authorization announcement number CN208688044U, which discloses an automobile air-conditioning expansion valve that is easy to install, including a valve body, a valve head is fixedly installed on the outer surface of the upper end of the valve body, a second inlet is fixedly installed on the outer surface of one side of the valve body near the upper end, and a first outlet is fixedly installed on the outer surface of one side of the valve body near the lower end, a second outlet is fixedly installed on the outer surface of the other side of the valve body near the upper end, and a first inlet is fixedly installed on the outer surface of the other side of the valve body near the lower end, and a diaphragm is provided at the inner upper end of the valve body.

[0004] In order to ensure the stability of the expansion valve during use, the expansion valve needs to be tested for air tightness. The conventional testing method is to put the expansion valve into water to observe whether bubbles are generated. However, this testing method is too dependent on the visual judgment of the staff. The staff's work intensity is high, and when the bubbles are small or the staff is visually fatigued, it is easy to cause detection errors, which has an adverse effect on the quality of the finished expansion valve. Utility Model Content

[0005] In order to improve the accuracy of expansion valve detection, the present application provides an air tightness detection device for an air conditioning expansion valve.

[0006] The present application provides an air tightness detection device for an air conditioning expansion valve, which adopts the following technical solution:

[0007] An air tightness detection device for an air conditioning expansion valve comprises a frame, on which the expansion valve is placed, and on which a testing mechanism for detecting the air tightness of the expansion valve is arranged, wherein the testing mechanism comprises:

[0008] A test air pipe, wherein the test air pipe is arranged on the frame;

[0009] A first connecting component, wherein the first connecting component is arranged on the frame, one end of the test gas pipe is connected to the gas source, and the other end of the test gas pipe is connected to the inside of the expansion valve through the first connecting component;

[0010] A pressure gauge, wherein the pressure gauge is arranged on the frame;

[0011] A pressure measuring tube, which is arranged on the frame and connected to a pressure gauge;

[0012] A second connecting assembly, wherein the second connecting assembly is arranged on the frame, and the pressure measuring tube is connected with the inside of the expansion valve through the second connecting assembly;

[0013] The pressure sensor is arranged on the pressure measuring tube and is located at one end of the pressure measuring tube that is connected to the inside of the expansion valve.

[0014] By adopting the above technical scheme, after the expansion valve to be tested for air tightness is placed on the rack, the test air pipe is connected to the expansion valve through the first connecting component, and the pressure measuring tube is connected to the expansion valve using the second connecting component. The test air pipe is ventilated to inject air into the expansion valve. The air pressure inside the expansion valve increases, causing the pressure sensor on the pressure measuring tube to be pressurized. After the pressure sensor is pressurized, the pressure signal is transmitted to the pressure gauge through the pressure measuring tube. The pressure gauge displays the air pressure inside the expansion valve. The staff can judge the air tightness state of the expansion valve by observing the indication of the pressure gauge. If the pressure gauge can maintain a fixed pressure value for a long period of time after the test air pipe stops ventilating, the expansion valve is well sealed. If the pressure indication number keeps changing and cannot be stabilized, the expansion valve has a sealing problem, thereby completing the detection of the sealing of the expansion valve. The detection is more intuitive and accurate, convenient for the staff to make judgments, and has low work intensity.

[0015] Optionally, the test air pipe is a hose made of rubber material, and the end of the test air pipe can be sleeved on the air inlet of the expansion valve. The first connecting component limits the sleeve connection between the test air pipe and the expansion valve, and the first connecting component includes:

[0016] Two first connecting rings, both of which are horizontally slidably arranged on the frame, and arc-shaped clamping grooves are provided on opposite side walls of the two first connecting rings;

[0017] A driving member is arranged on the frame and is used to drive the two first connecting rings to move relative to each other. Under the action of the driving member, the two first connecting rings cooperate with each other to clamp the test air pipe wrapped on the outer side wall of the air inlet of the expansion valve.

[0018] By adopting the above technical solution, the test air pipe is moved to cover the end of the test air pipe on the air inlet of the expansion valve, and then the driving member is started to drive the two first connecting rings to approach each other. The two first connecting rings approach each other to clamp the test air pipe on the air inlet of the expansion valve, thereby completing the fixed connection between the test air pipe and the expansion valve, reducing the probability of the test air pipe being detached from the expansion valve under the action of air pressure when the test air pipe is inflating the expansion valve, thereby ensuring the inflation effect.

[0019] Optionally, the driving member includes:

[0020] A driving screw rod, the driving screw rod is rotatably arranged on the frame, the driving screw rod is provided with two threaded sections with opposite spiral lines from the middle to the two ends, the driving screw rod is threadedly connected with two first connecting rings, and the two first connecting rings are respectively located on the two threaded sections with opposite spiral lines;

[0021] A driving motor is arranged on the frame and an output shaft is connected to the driving screw.

[0022] By adopting the above technical solution, the drive motor is started to drive the drive screw to rotate, and the rotation of the drive screw drives the first connecting ring and the second connecting ring to move relative to each other, thereby realizing the movement of the first connecting ring and the second connecting ring by controlling the drive motor.

[0023] Optionally, the pressure measuring tube includes a first tube and a second tube, the first tube is connected to a pressure gauge, the second tube is slidably installed on the first tube along the axial direction of the first tube, the pressure sensor is arranged on the second tube, and the second connecting assembly includes:

[0024] A connecting cover, the connecting cover is arranged on the second tube;

[0025] A moving part is arranged on the frame and is used to drive the connection cover to move. The connection cover is pressed against the air outlet of the expansion valve under the action of the moving part.

[0026] By adopting the above technical solution, the pressure measuring tube is set as a first tube and a second tube, and the second tube is slidably installed on the first tube. When it is necessary to measure the pressure inside the expansion valve, the moving part starts to drive the connecting cover to move, and the connecting cover moves and presses against the air outlet of the expansion valve. At the same time, the second tube drives the pressure sensor into the expansion valve to measure the internal air pressure of the expansion valve, thereby completing the connection between the pressure measuring tube and the expansion valve.

[0027] Optionally, the moving part includes:

[0028] A moving block, wherein the moving block is slidably arranged on the frame, and the connecting cover is arranged on the moving block;

[0029] A movable screw rod, wherein the movable screw rod is threadedly connected to the movable block;

[0030] A moving motor is arranged on a frame and an output shaft is connected to a moving lead screw.

[0031] By adopting the above technical solution, the moving motor is started to drive the moving screw to rotate, the moving screw rotates to drive the moving block to move, and the movement of the moving block drives the connecting cover to move, thereby realizing the movement of the connecting cover by controlling the moving motor.

[0032] Optionally, four positioning blocks are provided on the frame, the bottom of the expansion valve is placed between the four positioning blocks, and the four positioning blocks are in contact with the outer side walls of the expansion valve.

[0033] By adopting the above technical solution, four positioning blocks are fixedly installed on the frame, and the expansion valve is placed between the four positioning blocks. The four positioning blocks fix the position of the expansion valve during inflation, thereby reducing the probability of the expansion valve moving under the action of air pressure and ensuring the safety of the air tightness detection work.

[0034] Optionally, a rubber sealing pad is provided on the inner side wall of the connection cover.

[0035] By adopting the above technical solution, a rubber sealing pad is installed on the inner wall of the connecting cover, thereby improving the sealing performance when the connecting cover covers the air outlet of the expansion valve, and ensuring the accuracy of the air tightness test result.

[0036] In summary, the present application includes at least one of the following beneficial technical effects:

[0037] 1. Connect the test air pipe to the expansion valve through the first connecting component, and connect the pressure measuring tube to the expansion valve through the second connecting component. Ventilate the test air pipe to inject air into the expansion valve. The air pressure inside the expansion valve increases, which makes the pressure sensor on the pressure measuring tube pressurized. After the pressure sensor is pressurized, it transmits the pressure signal through the pressure measuring tube to the pressure gauge. The pressure gauge displays the air pressure inside the expansion valve. The staff can judge the air tightness of the expansion valve by observing the reading of the pressure gauge. If the pressure gauge can maintain a fixed pressure value for a long period of time after the test air pipe stops ventilating, the expansion valve has good sealing performance. If the pressure indication value keeps changing and cannot be stable, there is a problem with the sealing performance of the expansion valve. In this way, the detection of the sealing performance of the expansion valve is completed, which is more intuitive and accurate, convenient for the staff to judge, and has low work intensity.

[0038] 2. By setting the pressure measuring tube as the first tube and the second tube, and the second tube being slidably installed on the first tube, when it is necessary to measure the pressure inside the expansion valve, the moving part starts to drive the connecting cover to move, and the connecting cover moves and presses against the air outlet of the expansion valve, and at the same time, the second tube drives the pressure sensor to enter the expansion valve to measure the internal air pressure of the expansion valve, thereby completing the connection work between the pressure measuring tube and the expansion valve;

[0039] 3. By installing a rubber sealing pad on the inner wall of the connection cover, the sealing performance when the connection cover covers the air outlet of the expansion valve is improved, thereby ensuring the accuracy of the air tightness test result. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a three-dimensional structural schematic diagram of the present application;

[0041] Figure 2 It is a schematic diagram of the structure of the test mechanism in this application.

[0042] Figure numerals: 1. frame; 11. positioning block; 2. test mechanism; 21. test air pipe; 22. first connecting assembly; 23. pressure gauge; 24. pressure measuring tube; 25. second connecting assembly; 26. pressure sensor; 27. first tube; 28. second tube; 31. first connecting ring; 32. driving member; 33. clamping groove; 34. driving screw; 35. driving motor; 41. connecting cover; 42. moving member; 43. rubber sealing pad; 44. moving block; 45. moving screw; 46. moving motor. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1 -Attached Figure 2 This application is described in further detail.

[0044] The embodiment of the present application discloses an air tightness detection device for an air-conditioning expansion valve.

[0045] Reference Figure 1 The air tightness detection device of the air conditioning expansion valve comprises a frame 1, on which four positioning blocks 11 are fixedly mounted, and the expansion valve is placed on the frame 1 and located between the four positioning blocks 11. The frame 1 is provided with a testing mechanism 2 for detecting the air tightness of the expansion valve.

[0046] Reference Figure 1 and Figure 2 The test mechanism 2 includes a test air pipe 21, a first connection component 22, a pressure gauge 23, a pressure measuring tube 24, a second connection component 25 and a pressure sensor 26. The test air pipe 21 is fixedly mounted on the frame 1, one end of the test air pipe 21 is connected to the air source, and the other end of the test air pipe 21 is sleeved on the air inlet of the expansion valve. The test air pipe 21 is a hose made of rubber material.

[0047] Reference Figure 1 and Figure 2The first connecting component 22 is arranged on the frame 1 and is used to limit the socket joint between the test air pipe 21 and the expansion valve. The first connecting component 22 includes two first connecting rings 31 and a driving member 32. The two first connecting rings 31 are horizontally slidably installed on the frame 1, and arc-shaped clamping grooves 33 are provided on the two opposite side walls of the two first connecting rings 31. The driving member 32 is arranged on the frame 1 and is used to drive the two first connecting rings 31 to move relative to each other. Under the action of the driving member 32, the two first connecting rings 31 cooperate with each other to clamp the test air pipe 21 wrapped on the outer side wall of the air inlet of the expansion valve.

[0048] Reference Figure 1 and Figure 2 The driving member 32 includes a driving screw 34 and a driving motor 35. The driving screw 34 is rotatably mounted on the frame 1, and the driving screw 34 is provided with two threaded sections with opposite spiral lines from the middle to both ends. The driving screw 34 is threadedly connected to the two first connecting rings 31, and the two first connecting rings 31 are respectively located on the two threaded sections with opposite spiral lines. The driving motor 35 is fixedly mounted on the frame 1 and the output shaft is connected to the driving screw 34. The driving motor 35 is started to drive the driving screw 34 to rotate, and the rotation of the driving screw 34 drives the first connecting ring 31 and the second connecting ring to move relative to each other, so that the first connecting ring 31 and the second connecting ring limit the test air pipe 21 by controlling the driving motor 35.

[0049] Reference Figure 1 and Figure 2 The pressure gauge 23 is fixedly mounted on the frame 1. The pressure measuring tube 24 includes a first tube 27 and a second tube 28, and the first tube 27 is fixedly connected to the pressure gauge 23. One end of the second tube 28 is slidably inserted into the first tube 27. The other end of the second tube 28 is connected to the expansion valve. The pressure sensor 26 is fixedly mounted on one end of the second tube 28 away from the first tube 27.

[0050] Reference Figure 1 and Figure 2 The second connecting assembly 25 is arranged on the frame 1 and is used to drive the second tube 28 to communicate with the inside of the expansion valve. The second connecting assembly 25 includes a connecting cover 41 and a moving member 42, and the connecting cover 41 is fixedly installed on the second tube 28. A rubber sealing pad 43 is fixedly installed on the side wall connected away from the first tube 27. When the second tube 28 drives the pressure sensor 26 to extend into the air outlet of the expansion valve, the connecting cover 41 contacts the air outlet of the expansion valve. The moving member 42 is arranged on the frame 1 and is used to drive the connecting cover 41 to move, and the connecting cover 41 is pressed against the air outlet of the expansion valve under the action of the moving member 42.

[0051] Reference Figure 1 and Figure 2The moving member 42 includes a moving block 44, a moving screw 45 and a moving motor 46. The moving block 44 is horizontally slidably mounted on the frame 1, and the connecting cover 41 is fixedly mounted on the side wall of the moving block 44. The moving screw 45 is rotatably mounted on the frame 1 and is threadedly connected to the moving block 44. The moving motor 46 is fixedly mounted on the frame 1 and its output shaft is connected to the moving screw 45. The moving motor 46 is started to drive the moving screw 45 to rotate, and the rotation of the moving screw 45 drives the moving block 44 to move, and the movement of the moving block 44 drives the connecting cover 41 to move and press against the gas outlet of the expansion valve.

[0052] Reference Figure 1 and Figure 2 After the expansion valve to be tested for air tightness is placed on the rack 1, one end of the test air pipe 21 is sleeved on the air inlet of the expansion valve, and at the same time, the mobile motor 46 is started to send the pressure sensor 26 into the air outlet of the expansion valve. The test air pipe 21 is ventilated to inject air into the expansion valve. The air pressure inside the expansion valve increases, which makes the pressure sensor 26 on the pressure measuring tube 24 pressurized. After the pressure sensor 26 is pressurized, the pressure signal is transmitted to the pressure gauge 23 through the pressure measuring tube 24. The pressure gauge 23 displays the air pressure inside the expansion valve. The staff can judge the air tightness state of the expansion valve by observing the reading of the pressure gauge 23. If the pressure gauge 23 can maintain a fixed pressure value for a long period of time after the test air pipe 21 stops ventilating, the expansion valve is well sealed. If the reading of the pressure gauge 23 keeps changing and cannot be stable, the expansion valve has a problem with sealing. The detection of the sealing of the expansion valve is completed, which is more intuitive and accurate, convenient for the staff to make judgments, and has low work intensity.

[0053] The working principle of the embodiment of the present application is as follows:

[0054] One end of the test air pipe 21 is sleeved on the air inlet of the expansion valve, and the drive motor 35 is started to drive the two first connecting rings 31 to clamp the test air pipe 21. The moving motor 46 is started to drive the pressure sensor 26 into the air outlet of the expansion valve and drive the connecting cover 41 to cover the air outlet of the expansion valve. The test air pipe 21 is ventilated to inject air into the expansion valve. The air pressure inside the expansion valve increases, so that the pressure sensor 26 on the pressure measuring tube 24 is pressurized. After the pressure sensor 26 is pressurized, the pressure signal is transmitted to the pressure gauge 23 through the pressure measuring tube 24. The pressure gauge 23 displays the air pressure inside the expansion valve. The staff can judge the air tightness state of the expansion valve by observing the reading of the pressure gauge 23.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An air tightness detection device for an air conditioning expansion valve, characterized in that: The invention comprises a frame (1), an expansion valve is placed on the frame (1), a testing mechanism (2) for testing the air tightness of the expansion valve is arranged on the frame (1), and the testing mechanism (2) comprises: A test air pipe (21), wherein the test air pipe (21) is arranged on the frame (1); A first connecting component (22), wherein the first connecting component (22) is arranged on the frame (1), one end of the test gas pipe (21) is connected to the gas source, and the other end of the test gas pipe (21) is connected to the inside of the expansion valve through the first connecting component (22); A pressure gauge (23), wherein the pressure gauge (23) is arranged on the frame (1); A pressure measuring tube (24), wherein the pressure measuring tube (24) is arranged on the frame (1) and connected to the pressure gauge (23); A second connecting assembly (25), wherein the second connecting assembly (25) is arranged on the frame (1), and the pressure measuring tube (24) is connected to the inside of the expansion valve through the second connecting assembly (25); A pressure sensor (26) is provided on the pressure measuring tube (24) and is located at one end of the pressure measuring tube (24) that is in communication with the interior of the expansion valve.

2. The air tightness detection device for an air conditioning expansion valve according to claim 1, characterized in that: The test air pipe (21) is a hose made of rubber material. The end of the test air pipe (21) can be sleeved on the air inlet of the expansion valve. The first connecting component (22) limits the sleeve connection between the test air pipe (21) and the expansion valve. The first connecting component (22) comprises: Two first connecting rings (31), the two first connecting rings (31) are both horizontally slidably arranged on the frame (1), and arc-shaped clamping grooves (33) are formed on opposite side walls of the two first connecting rings (31); A driving member (32) is arranged on the frame (1) and is used to drive the two first connecting rings (31) to move relative to each other, and the two first connecting rings (31) cooperate with each other to clamp the test air pipe (21) wrapped on the outer wall of the air inlet of the expansion valve under the action of the driving member (32).

3. The air tightness detection device for an air conditioning expansion valve according to claim 2, characterized in that: The driving member (32) comprises: A driving screw rod (34), the driving screw rod (34) being rotatably arranged on the frame (1), the driving screw rod (34) being provided with two threaded sections with opposite spiral lines from the middle to the two ends, the driving screw rod (34) being threadedly connected to the two first connecting rings (31), the two first connecting rings (31) being respectively located on the two threaded sections with opposite spiral lines; A driving motor (35) is arranged on the frame (1) and the output shaft of the driving motor (35) is connected to the driving screw rod (34).

4. The air tightness detection device for an air conditioning expansion valve according to claim 1, characterized in that: The pressure measuring tube (24) comprises a first tube (27) and a second tube (28), the first tube (27) is connected to the pressure gauge (23), the second tube (28) is slidably mounted on the first tube (27) along the axial direction of the first tube (27), the pressure sensor (26) is arranged on the second tube (28), and the second connecting assembly (25) comprises: a connecting cover (41), wherein the connecting cover (41) is arranged on the second tube (28); A moving member (42) is arranged on the frame (1) and is used to drive the connecting cover (41) to move; the connecting cover (41) is pressed against the gas outlet of the expansion valve under the action of the moving member (42).

5. The air tightness detection device for an air conditioning expansion valve according to claim 4, characterized in that: The moving member (42) comprises: A moving block (44), wherein the moving block (44) is slidably arranged on the frame (1), and the connecting cover (41) is arranged on the moving block (44); A movable screw rod (45), wherein the movable screw rod (45) is rotatably disposed on the frame (1) and is threadably connected to the movable block (44); A moving motor (46), wherein the moving motor (46) is arranged on the frame (1) and the output shaft is connected to the moving screw rod (45).

6. The air tightness detection device for an air conditioning expansion valve according to claim 1, characterized in that: Four positioning blocks (11) are arranged on the frame (1), the bottom of the expansion valve is placed between the four positioning blocks (11), and the four positioning blocks (11) are in contact with the outer side wall of the expansion valve.

7. The air tightness detection device for an air conditioning expansion valve according to claim 4, characterized in that: A rubber sealing pad (43) is provided on the inner side wall of the connection cover (41).

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