A helium test connector for testing automotive compressors

Abstract

This invention relates to the field of helium testing technology and proposes a helium testing connector for automotive compressor testing. The connector includes a base, two supports fixed to the base, a helium testing connector mounted on the two supports, and an intake and exhaust pipe connecting the two helium testing connectors. Each helium testing connector includes a gas guide pipe and a diverter valve fixed within the gas guide pipe. In this invention, the second leak-proof airbag, after inflating, can hook onto the compressor's inlet and outlet flanges via a clamping mechanism. The first leak-proof airbag, after inflating, can expand outwards via a holding mechanism. Under the action of the tensioning mechanism, the holding mechanism can automatically clamp onto the inner wall of the compressor housing, thereby ensuring a stable connection between the gas guide pipe and the compressor's inlet and outlet pipes. This prevents the first leak-proof airbag from being squeezed out of the compressor's inlet and outlet pipes under high air pressure, thus ensuring stable connection during testing and sealing at the interface. This solves the problems in existing technologies where the pressure difference between the inside and outside of the compressor easily causes the sealing airbag to be squeezed out and the helium testing head to loosen from the compressor pipes.

Description

Technical Field

[0001] This invention relates to the field of helium testing technology, specifically to a helium testing connector for testing automotive compressors. Background Technology

[0002] Helium leak detection is a testing method that involves evacuating the workpiece before filling it with helium gas at a certain pressure. The workpiece is placed in a vacuum chamber with a specific vacuum level, which is connected to the leak detection port of a helium mass spectrometer. If the workpiece leaks, the helium gas that leaked into the vacuum chamber can be detected by the helium mass spectrometer. A gas filling and recovery device is connected to the workpiece to perform helium filling and recovery before and after leak detection, respectively.

[0003] As a component of a car, the automotive air conditioning compressor is the heart of the automotive air conditioning refrigeration system, playing the role of compressing and transporting refrigerant vapor. Compressors are divided into two types: fixed displacement and variable displacement. Regardless of whether they are variable displacement or variable displacement compressors, they all require helium testing before leaving the factory. A search revealed that CN114858358B discloses a helium detection device to prevent helium leakage. This device includes a helium detection base, a pair of helium probes for testing both ends of the compressor, a sealing gasbag at the end of each probe, a drive unit for individually controlling the displacement of each probe, and a connecting pipe. Support frames are symmetrically installed in pairs on the helium detection base, and these support frames are detachably connected to the drive unit. Each helium probe has a guide channel for helium flow, and the probes at both ends are inserted into the compressor to perform helium release and extraction movements respectively.

[0004] The aforementioned helium detection device inserts the end of the helium probe into the compressor and inflates the sealed space before the helium test, causing the sealing gasbag to expand and seal the inside and outside of the compressor to prevent air from entering. After the helium test, the helium inside the compressor is extracted for inspection while the helium in the sealing gasbag is extracted at the same time or in stages. However, the aforementioned helium detection device still has the following problems: The sealing gasbag of the aforementioned helium detection device lacks a fixed structure. Since the helium test requires a sufficient amount of helium to be filled into the compressor, the internal pressure of the compressor is very high. The helium test of the compressor must be carried out in a vacuum environment. The pressure difference between the inside and outside of the compressor causes the sealing gasbag to be subjected to enormous pressure. At the same time, due to the variable elasticity of the sealing gasbag, the sealing gasbag is easily squeezed out of the compressor's inlet and outlet pipes under the huge pressure difference. In addition, the pressure can also cause the helium probe to loosen from the compressor pipe, resulting in helium leakage, or the helium probe may be directly pushed out of the compressor, thereby causing damage to the surrounding area. Summary of the Invention

[0005] This invention proposes a helium probe for testing automotive compressors, which solves the problems in the prior art where the pressure difference between the inside and outside of the compressor easily causes the sealing gasbag to be squeezed out and the helium probe to loosen with the compressor pipe.

[0006] The technical solution of the present invention is as follows: A helium detection connector for testing an automotive compressor includes a base, two brackets fixed on the base, a helium detection connector disposed on the two brackets, and an intake and exhaust pipe connecting the two helium detection connectors. The helium detection connector includes a gas guide pipe and a diverter valve fixed inside the gas guide pipe. A first retaining ring and a second retaining ring are fixed on the outer side of the end of the gas guide pipe. A first leak-proof airbag is provided between the first retaining ring and the second retaining ring and is sleeved around the gas guide pipe. A clamping mechanism is provided between the first leak-proof airbag and the second retaining ring. A sleeve is sleeved on the outer side of the gas guide pipe. A sleeve sleeved on the inner side of the sleeve is fixed. A tensioning mechanism for driving the gas guide pipe to extend and slide is provided inside the sleeve. A second leak-proof airbag and a clamping mechanism distributed in a ring around the second leak-proof airbag are provided inside the sleeve. The first leak-proof airbag and the second leak-proof airbag are connected to the diverter valve through a pipeline.

[0007] Preferably, the holding mechanism includes a slip ring, which is slidably sleeved on the outside of the air duct. A plurality of annularly distributed first hinge seats are fixed on the side of the slip ring facing away from the first leak-proof airbag, and a claw is hinged on the first hinge seat. The end of the claw away from the first hinge seat is elastically connected to a second retaining ring through a first spring. The edge of the second retaining ring has a movable opening corresponding to the claw, and a second retaining rod is fixed in the movable opening. The claw abuts against the second retaining rod under the elastic force of the first spring.

[0008] Preferably, the pawl is ratchet-shaped, and the head of the pawl is flat, and the contact surface between the pawl and the second stop is an inclined surface.

[0009] Preferably, a first stop bar is fixed on the first hinge seat, and the pawl is located between the second stop bar and the first stop bar.

[0010] Preferably, the stretching mechanism includes a first electromagnet, a second electromagnet, and a third spring that elastically connects the first electromagnet and the second electromagnet. The first electromagnet is fixed to the outside of the air duct, and the second electromagnet is fixed to the inner wall of the housing.

[0011] Preferably, the clamping mechanism includes a clamping rod, one end of which is hinged to a second hinge seat, the second hinge seat being fixed to the inner wall of the housing, and the clamping rod being elastically connected to the inner wall of the housing via a second spring.

[0012] Preferably, a pressure plate is fixed to the end of the clamping rod away from the second hinge seat, and the pressure plate extends in the direction of the second leak-proof airbag.

[0013] Preferably, the middle of the casing is raised, and a cavity is formed on its inner side to accommodate the second leak-proof airbag and the movement of the clamping mechanism.

[0014] Preferably, the housing and sleeve are both fixedly fitted with sealing rings in the gap between them and the air guide tube.

[0015] Preferably, the pipeline includes a first air tube and a second air tube. The first air tube is located inside the air guide tube and its two ends are respectively connected to a first leak-proof airbag and a diversion valve. The second air tube is located outside the air guide tube and its two ends are respectively connected to a second leak-proof airbag and a diversion valve.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. In this invention, the flow is adjusted sequentially by the diversion valve so that helium is injected separately into the second leak-proof airbag and the first leak-proof airbag. This ensures that the amount of helium in the second leak-proof airbag and the first leak-proof airbag is sufficient and the pressure remains stable. This is beneficial for double sealing from the inside and outside of the compressor inlet and outlet pipelines. Compared with the prior art, this invention can reduce helium leakage.

[0018] 2. In this invention, after the second anti-leakage airbag expands, it can hook onto the outer flange of the compressor inlet and outlet pipes through the clamping mechanism. After the first anti-leakage airbag expands, it can expand outward through the clamping mechanism, increasing the radius of the space occupied by the clamping mechanism. This prevents the air guide pipe from escaping from the compressor inlet and outlet pipes. Under the action of the tensioning mechanism, the clamping mechanism can automatically clamp the inner wall of the compressor housing, thereby ensuring a stable connection between the air guide pipe and the compressor inlet and outlet pipes. At the same time, the first anti-leakage airbag is prevented from being squeezed out of the compressor inlet and outlet pipes under the action of large air pressure by the claws. This ensures a stable connection during testing and a seal at the interface, solving the problems in the prior art where the pressure difference between the inside and outside of the compressor easily causes the sealing airbag to be squeezed out and the helium probe to loosen from the compressor pipe.

[0019] 3. In this invention, since the gas source used for the first leak-proof airbag and the second leak-proof airbag, as well as the gas source used for helium detection, are all the same, there is no waste of helium during use, which can improve the helium recovery effect and ensure that the helium utilization rate is at a high level. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a three-dimensional structural diagram of a helium detector connector for testing automotive compressors proposed in this invention;

[0022] Figure 2 This is a three-dimensional cross-sectional structural diagram of the helium detector connector proposed in this invention;

[0023] Figure 3 This is a front view of the cross-sectional structure of the helium detector connector proposed in this invention;

[0024] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle;

[0025] Figure 5 This is a schematic diagram of a partial three-dimensional structure of the air duct proposed in this invention;

[0026] Figure 6 for Figure 5 Enlarged structural diagram at point A in the middle;

[0027] Figure 7 This is a schematic diagram of the clamping mechanism structure proposed in this invention;

[0028] Figure 8 This is a schematic diagram of the clamping and stretching mechanism proposed in this invention;

[0029] In the diagram: 1. Base; 2. Bracket; 3. Inlet and outlet pipes; 4. Helium detector connector; 41. Gas guide pipe; 411. First retaining ring; 412. Second retaining ring; 4121. Movable port; 4122. Second stop bar; 42. Sleeve; 43. Diverter valve; 44. First leak-proof airbag; 45. Second leak-proof airbag; 46. Sleeve; 47. Clamping mechanism; 471. Slip ring; 472. First hinge seat; 473. Claw; 4731. Inclined surface; 474. First spring; 475. First stop bar; 48. Gripping mechanism; 481. Clamping rod; 4811. Pressure plate; 482. Second hinge seat; 483. Second spring; 49. Tensioning mechanism; 491. First electromagnet; 492. Second electromagnet; 493. Third spring; 410. Pipeline; 4101. First air pipe; 4102. Second air pipe. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1 and Figure 2This invention provides a technical solution: a helium detection connector for testing automotive compressors, comprising a base 1, two brackets 2 fixed on the base 1, a helium detection connector 4 mounted on the two brackets 2, and an intake and exhaust pipe 3 connecting the two helium detection connectors 4. The helium detection connector 4 includes a gas guide pipe 41 and a diverter valve 43 fixed within the gas guide pipe 41. The diverter valve 43 can be a conventional four-way valve, with one port for helium, two other ports connected to a first leak-proof airbag 44 and a second leak-proof airbag 45 respectively, and the last port for helium to enter the compressor cavity. Each port is controlled by a separate valve core. A first retaining ring 411 and a second retaining ring 412 are fixed to the outer side of the end of the gas guide pipe 41. A first retaining ring 411 is provided between the first retaining ring 411 and the second retaining ring 412, which is a ring sleeved around the outside of the gas guide pipe 41. A leak-proof airbag 44 is provided. A holding mechanism 47 is provided between the first leak-proof airbag 44 and the second retaining ring 412. A sleeve 42 is fitted on the outside of the air guide tube 41. A sleeve 46 is fixed on the inside of the sleeve 42 and fitted on the outside of the air guide tube 41. A tensioning mechanism 49 is provided inside the sleeve 46 to drive the air guide tube 41 to extend and slide. A second leak-proof airbag 45 and a clamping mechanism 48 arranged in a ring around the second leak-proof airbag 45 are provided inside the sleeve 42. Both the first leak-proof airbag 44 and the second leak-proof airbag 45 are annular airbags. The first leak-proof airbag 44 and the second leak-proof airbag 45 are connected to a diverter valve 43 through a pipe 410. When connected to the compressor inlet and outlet pipes, the diverter valve 43 adjusts the flow sequentially, so that helium is injected into the second leak-proof airbag 45 and the first leak-proof airbag 44 respectively. Figure 3 As shown, after the second leak-proof airbag 45 expands, it can hook onto the outer flange of the compressor inlet and outlet pipes through the clamping mechanism 48. After the first leak-proof airbag 44 expands, it can expand outward through the clamping mechanism 47, increasing the radius of the space occupied by the clamping mechanism 47, so that the air guide pipe 41 cannot escape from the compressor inlet and outlet pipes. Under the action of the tensioning mechanism 49, the clamping mechanism 47 can automatically clamp the inner wall of the compressor housing, thereby making the air guide pipe 41 stably connected with the compressor inlet and outlet pipes. At the same time, under the obstruction of the claw 473, the first leak-proof airbag 44 can be prevented from being squeezed out of the compressor inlet and outlet pipes under the action of large air pressure, thereby ensuring stable connection during testing and sealing at the interface to reduce helium leakage.

[0032] Please see Figure 4 , Figure 5 , Figure 6 and Figure 7The holding mechanism 47 includes a slip ring 471, which is slidably sleeved on the outside of the air duct 41. Several annularly distributed first hinge seats 472 are fixed on the side of the slip ring 471 facing away from the first leak-proof airbag 44. A pawl 473 is hinged to each of the first hinge seats 472. The end of the pawl 473 away from the first hinge seat 472 is elastically connected to a second retaining ring 412 via a first spring 474. The edge of the second retaining ring 412 has a movable opening 4121 corresponding to the pawl 473, and a second retaining rod 4122 is fixed inside the movable opening 4121. The pawl 473 abuts against the second retaining rod 4122 under the elastic force of the first spring 474. The pawl 473 is pawl-shaped, and the head of the pawl 473... The contact surface between the flat claw 473 and the second stop 4122 is an inclined surface 4731. The first stop 475 is fixed on the first hinge seat 472. The claw 473 is located between the second stop 4122 and the first stop 475. When the gas volume in the first leak-proof airbag 44 increases and expands, it can squeeze the slip ring 471, thereby pushing the slip ring 471 to move towards the second stop ring 412. During this process, the inclined surface 4731 at the bottom of the claw 473 is resisted by the second stop 4122, which allows the claw 473 to overcome the elastic force of the first spring 474 and open outward. At this time, the end of the claw 473 can no longer pass through the inner cavity of the compressor inlet and outlet air pipes until the claw 473 contacts the first stop 475.

[0033] Please see Figure 8 The stretching mechanism 49 includes a first electromagnet 491, a second electromagnet 492, and a third spring 493 that elastically connects the first electromagnet 491 and the second electromagnet 492. The first electromagnet 491 is fixed to the outside of the air guide pipe 41, and the second electromagnet 492 is fixed to the inner wall of the sleeve 42. The first electromagnet 491 and the second electromagnet 492 inside the sleeve 46 are energized, and under the action of magnetic force, the first electromagnet 491 and the second electromagnet 492 are brought closer to each other. Since the sleeve 42 is held still by the clamping rod 481, the air guide pipe 41 can move outward along the inner cavity of the compressor inlet and outlet pipes until the chuck 473 abuts against the inner wall of the compressor housing, so that the air guide pipe 41 can be stably connected to the compressor inlet and outlet pipes.

[0034] Please see Figure 8The clamping mechanism 48 includes a clamping rod 481, one end of which is hinged to a second hinge seat 482. The second hinge seat 482 is fixed to the inner wall of the housing 42. The clamping rod 481 is elastically connected to the inner wall of the housing 42 through a second spring 483. A pressure plate 4811 is fixed to the end of the clamping rod 481 away from the second hinge seat 482. The pressure plate 4811 extends in the direction of the second leak-proof airbag 45. The middle part of the housing 42 is raised, and a cavity is formed on its inner side to accommodate the second leak-proof airbag 45 and the clamping mechanism 48. This provides space for the contraction of the second leak-proof airbag 45 when it deflates and for the retraction of the clamping mechanism 48, so as to realize the insertion and extraction of the housing 42.

[0035] It should be noted that sealing rings are fixedly embedded in the gap between the housing 42 and the sleeve 46 and the gas guide tube 41, so as to achieve the sealing when the gas guide tube 41 slides and extends, avoid the leakage of helium, and improve the accuracy of detection.

[0036] like Figure 3 As shown, the pipeline 410 includes a first air pipe 4101 and a second air pipe 4102. The first air pipe 4101 is located inside the air guide tube 41, and its two ends are connected to the first leak-proof airbag 44 and the diversion valve 43, respectively. The second air pipe 4102 is located outside the air guide tube 41, and its two ends are connected to the second leak-proof airbag 45 and the diversion valve 43, respectively. The first leak-proof airbag 44 and the second leak-proof airbag 45 are connected by internal wiring and external wiring, respectively.

[0037] The working principle and usage process of this invention are as follows: When the helium detector connector 4 is connected to the compressor under test, as follows... Figure 3 As shown, one end of the gas guide pipe 41 with the first leak-proof airbag 44 is inserted into the compressor port, and the housing 42 and the second leak-proof airbag 45 inside the housing 42 are fitted over the compressor inlet and outlet pipes. Helium is supplied to the gas guide pipe 41 through the helium detection connector 4, and the diversion valve 43 supplies helium only to the second leak-proof airbag 45 through the second gas pipe 4102, which increases the amount of gas in the second leak-proof airbag 45 and causes it to expand. During the expansion of the second leak-proof airbag 45, the pressure plate 4811 presses the clamping rod 481, so that the clamping rod 481 overcomes the elastic force of the second spring 483 and automatically clamps the compressor inlet and outlet pipes until it comes into contact with the outer flange of the compressor inlet and outlet pipes.

[0038] Then, the diversion valve 43 disconnects the second air pipe 4102, keeping the second leak-proof airbag 45 inflated and with stable air pressure. At the same time, it opens the pipe where the first air pipe 4101 is located, allowing helium to be delivered to the first leak-proof airbag 44 only through the first air pipe 4101. This increases the amount of gas in the first leak-proof airbag 44 and causes it to expand. During the expansion of the first leak-proof airbag 44, it can squeeze the slip ring 471, thereby pushing the slip ring 471 to move towards the second stop ring 412. During this process, the bottom inclined surface 4731 of the claw 473 is resisted by the second stop rod 4122, allowing the claw 473 to overcome the elastic force of the first spring 474 and open outward. At this time, the end of the claw 473 can no longer pass through the inner cavity of the compressor inlet and outlet air pipes until the claw 473 contacts the first stop rod 475. Then, the diversion valve 43 disconnects the first air pipe 4101, keeping the first leak-proof airbag 44 inflated and with stable air pressure.

[0039] The first electromagnet 491 and the second electromagnet 492 inside the sleeve 46 are energized. Under the action of magnetic force, the first electromagnet 491 and the second electromagnet 492 are brought closer to each other. Since the sleeve 42 is held still by the clamping rod 481, the air guide tube 41 can move outward along the inner cavity of the compressor inlet and outlet pipes until the chuck 473 abuts against the inner wall of the compressor housing. This allows the air guide tube 41 to be stably connected with the compressor inlet and outlet pipes. At the same time, the chuck 473 prevents the first leak-proof airbag 44 from being squeezed out of the compressor inlet and outlet pipes under high air pressure, thereby ensuring stable connection during testing and sealing at the interface to reduce helium leakage.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A helium detector connector for testing an automotive compressor, comprising a base (1), two brackets (2) fixed on the base (1), a helium detector connector (4) disposed on the two brackets (2), and an intake and exhaust pipe (3) connecting the two helium detector connectors (4), characterized in that, The helium detector connector (4) includes a gas guide tube (41) and a diverter valve (43) fixed inside the gas guide tube (41). A first retaining ring (411) and a second retaining ring (412) are fixed to the outer side of the end of the gas guide tube (41). A first leak-proof airbag (44) is provided between the first retaining ring (411) and the second retaining ring (412) and is sleeved around the gas guide tube (41). A locking mechanism (47) is provided between the first leak-proof airbag (44) and the second retaining ring (412). The outer side of the gas guide tube (41) A sleeve (42) is provided on the side, and a sleeve (46) is fixed inside the sleeve (42) and sleeved outside the air guide tube (41). A tensioning mechanism (49) is provided inside the sleeve (46) to drive the air guide tube (41) to extend and slide. A second leak-proof airbag (45) and a clamping mechanism (48) are provided inside the sleeve (42). The first leak-proof airbag (44) and the second leak-proof airbag (45) are connected to the diversion valve (43) through a pipeline (410). The holding mechanism (47) includes a slip ring (471), which is slidably sleeved on the outside of the air duct (41). A number of annularly distributed first hinge seats (472) are fixed on the side of the slip ring (471) facing away from the first leak-proof airbag (44), and a claw (473) is hinged on the first hinge seat (472). The end of the claw (473) away from the first hinge seat (472) is elastically connected to the second retaining ring (412) through the first spring (474). The edge of the second retaining ring (412) is provided with a movable opening (4121) corresponding to the claw (473), and a second stop bar (4122) is fixed in the movable opening (4121). The claw (473) abuts against the second stop bar (4122) under the elastic force of the first spring (474). The pawl (473) is pawl-shaped, and the head of the pawl (473) is flat. The contact surface between the pawl (473) and the second stop (4122) is an inclined surface (4731). A first stop (475) is fixed on the first hinge (472), and the claw (473) is located between the second stop (4122) and the first stop (475); The stretching mechanism (49) includes a first electromagnet (491), a second electromagnet (492), and a third spring (493) that elastically connects the first electromagnet (491) and the second electromagnet (492). The first electromagnet (491) is fixed to the outside of the air duct (41), and the second electromagnet (492) is fixed to the inner wall of the casing (42). The clamping mechanism (48) includes a clamping rod (481), one end of which is hinged to a second hinge seat (482). The second hinge seat (482) is fixed to the inner wall of the casing (42), and the clamping rod (481) is elastically connected to the inner wall of the casing (42) through a second spring (483). The clamping rod (481) is fixed with a pressure plate (4811) at one end away from the second hinge seat (482), and the pressure plate (4811) extends in the direction of the second leak-proof airbag (45).

2. The helium detector connector for testing automotive compressors according to claim 1, characterized in that, The middle part of the casing (42) is raised, and a cavity is formed on its inner side to accommodate the second leak-proof airbag (45) and the clamping mechanism (48).

3. A helium detector connector for testing automotive compressors according to claim 2, characterized in that, The housing (42) and sleeve (46) are both fixedly fitted with sealing rings in the gap between them and the air guide pipe (41).

4. A helium detector connector for testing automotive compressors according to claim 3, characterized in that, The pipeline (410) includes a first air tube (4101) and a second air tube (4102). The first air tube (4101) is located inside the air guide tube (41) and its two ends are respectively connected to the first leak-proof airbag (44) and the diversion valve (43). The second air tube (4102) is located outside the air guide tube (41) and its two ends are respectively connected to the second leak-proof airbag (45) and the diversion valve (43).

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