A cylinder sealing test device for automobile air conditioner compressor

Abstract

The application relates to the technical field of automobile part manufacturing, and provides a cylinder jointing air tightness testing device for an automobile air conditioner compressor, which comprises a shell assembly, a butt joint sealing assembly, a power transmission assembly and a fluid circulation assembly, wherein the butt joint sealing assembly is coaxially assembled on the inner side of the shell assembly, the power transmission assembly is in transmission connection with the butt joint sealing assembly, and the fluid circulation assembly is assembled at the tail end of the shell assembly. According to the air tightness testing device, reliable sealing, efficient operation and smooth fluid circulation can be realized during the cylinder jointing air tightness testing of the automobile air conditioner compressor, and the testing accuracy and efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of automotive parts manufacturing technology, and in particular to a cylinder tightness testing device for automotive air conditioning compressors. Background Technology

[0002] Currently, the cylinder tightness testing of automotive air conditioning compressors mainly falls into three categories: pressure method, vacuum method, and bubble method. These methods have the following shortcomings:

[0003] 1. Most pressure-based devices use a single sealing surface or a simple rubber ring seal. When the test pressure fluctuates or there are minor machining errors at the cylinder connection port, problems such as seal failure and leakage are likely to occur.

[0004] 2. The switching between sealing and conduction during vacuum testing relies on a complex transmission mechanism, which is cumbersome to operate and slow to respond. Furthermore, the lack of a reliable reset mechanism means the sealing component cannot be accurately reset to its initial sealing position, thus affecting the stability and repeatability of subsequent tests.

[0005] 3. The bubble method fluid circulation system has poor compatibility with the sealing mechanism, and the test medium flow is prone to instability due to unreasonable flow channel design, resulting in fluctuations in test parameters such as pressure and flow rate.

[0006] Therefore, how to provide a cylinder tightness testing device for automotive air conditioning compressors that integrates reliable sealing, fast response speed, and stable fluid circulation to improve the accuracy and efficiency of cylinder tightness testing, thereby ensuring the production quality of automotive air conditioning compressors, has become an urgent technical problem to be solved. Summary of the Invention

[0007] In view of this, in order to overcome the shortcomings of the prior art, the present invention aims to provide an airtightness testing device for automotive air conditioning compressor cylinder closing.

[0008] According to one aspect of the present invention, an airtightness testing device for an automotive air conditioning compressor is provided. The airtightness testing device includes a housing assembly, a mating sealing assembly, a power transmission assembly, and a fluid circulation assembly. The mating sealing assembly is coaxially mounted on the inner side of the housing assembly, the power transmission assembly is connected to the mating sealing assembly, and the fluid circulation assembly is mounted on the tail end of the housing assembly.

[0009] Preferably, the housing assembly includes a rigidly connected front housing and a rear housing. The inner side of the front housing is provided with a guide cone hole, a valve core sliding hole, a first cavity and a second cavity coaxially connected in sequence. The outer side of the second cavity is provided with a side wall boss. The inner side of the side wall boss is provided with a shaft hole communicating with the second cavity. Two annular bushing grooves are symmetrically provided along the shaft hole in the second cavity. The inner side of one end of the rear housing is provided with a valve seat cavity. The inner side of the other end is provided with a positioning boss extending into the valve seat cavity. The inner side of the positioning boss is provided with a flow guide cavity and a flow guide groove hole coaxially connected.

[0010] Preferably, the mating sealing assembly includes a guide cone, a first valve core, a sealing ring, and a second valve core. The guide cone is assembled in the guide cone hole, the first valve core is coaxially disposed in the valve core sliding hole and the first cavity, the sealing ring is disposed between the first valve core and the first cavity, and the second valve core is coaxially disposed in the valve seat cavity.

[0011] Preferably, the first valve core is composed of a valve core cone and a valve core body. The valve core body is provided with a first valve core positioning groove, a valve core sealing groove and a valve core positioning protrusion. The second valve core is composed of a valve core front end and a valve core tail end. The valve core front end is provided with a second valve core positioning groove and the valve core tail end is provided with a second valve core assembly groove.

[0012] Preferably, the sealing state of the mating sealing assembly is such that the valve core cone of the first valve core fits into the guide cone to form a conical surface seal, the sealing ring fits into the inner wall of the first cavity to form a radial seal, and the valve core tail end of the second valve core fits into the positioning boss to form an end face seal.

[0013] Preferably, the power transmission assembly includes a push rod, a pressure rod, a sloping slider, a first elastic element, and a second elastic element. One end of the push rod is fitted into the positioning groove of the first valve core, and the other end is fitted into the positioning groove of the second valve core. The upper side is provided with a sloping protrusion. The pressure rod is fitted into the shaft hole. The sloping slider is fixed to the bottom end of the pressure rod, and its bottom sloping surface matches the sloping protrusion of the push rod. The bushing is fitted into the annular bushing groove. The first elastic element is located on the outside of the first valve core, and the second elastic element is located on the outside of the positioning boss.

[0014] Preferably, the push rod, through the engagement of the inclined surface slider and the inclined surface protrusion, converts the vertical movement of the pressure rod into axial movement, driving the first valve core and the second valve core to open and close synchronously.

[0015] Preferably, the two ends of the first elastic element are respectively connected to the end face of the valve core sliding hole and the valve core positioning protrusion of the first valve core, and the two ends of the second elastic element are respectively connected to the valve core tail end of the second valve core and the bottom end of the valve seat cavity.

[0016] Preferably, the bushing contains a plurality of circumferentially distributed fluid passages that are tapered at both ends and cylindrical in the middle.

[0017] Preferably, the fluid circulation assembly includes a flow guide cone assembled in the flow guide slot of the rear housing, and a pump body and a liquid storage tank connected in sequence with the flow guide cone.

[0018] The automotive air conditioning compressor cylinder tightness testing device according to an embodiment of the present invention has the following beneficial technical effects:

[0019] 1. Improve sealing reliability

[0020] Through multi-part adaptive sealing design, it can adapt to minor processing errors at the test object's port, enhance the sealing effect, avoid sealing failure caused by test pressure fluctuations, and ensure accurate airtightness test results.

[0021] 2. Improve operational efficiency and response speed

[0022] With a simple transmission structure, it can quickly switch between sealed and open states without complicated operation, greatly shortening the switching time.

[0023] 3. Stable fluid circulation

[0024] A smooth fluid flow path ensures uniform flow of the test medium, reduces turbulence and pressure fluctuations, lowers fluid resistance, ensures stable medium circulation during testing, and improves the reliability of airtightness test data. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural example diagram of an automotive air conditioning compressor cylinder tightness testing device according to an embodiment of the present invention;

[0027] Figure 2 This is a cross-sectional structural example of an automotive air conditioning compressor cylinder tightness testing device according to an embodiment of the present invention;

[0028] Figure 3 This is a structural example diagram of a housing assembly according to an embodiment of the present invention;

[0029] Figure 4 This is a structural example diagram of the first valve core according to an embodiment of the present invention;

[0030] Figure 5 This is a structural example diagram of the second valve core according to an embodiment of the present invention;

[0031] Figure 6 This is a first partial structural cross-sectional example of the automotive air conditioning compressor cylinder tightness testing device according to an embodiment of the present invention;

[0032] Figure 7 This is a cross-sectional example of the second partial structure of the automotive air conditioning compressor cylinder tightness testing device according to an embodiment of the present invention;

[0033] Figure 8This is a cross-sectional example of the third part of the structure of the automotive air conditioning compressor cylinder tightness testing device according to an embodiment of the present invention;

[0034] Figure 9 This is a structural example diagram of a fluid circulation assembly according to an embodiment of the present invention;

[0035] In the diagram, A - housing assembly, B - docking sealing assembly, C - power transmission assembly, D - fluid circulation assembly, A1 - front housing, A2 - rear housing, B1 - guide cone, B2 - first valve core, B3 - sealing ring, B4 - second valve core, C1 - push rod, C2 - pressure rod, C3 - inclined slider, C4 - first elastic element, C5 - second elastic element, C6 - bushing, D1 - guide cone, D2 - pump body, D3 - liquid storage tank, A11 - guide cone hole, A12 - valve core sliding hole, A13 - first cavity, A14 - second Cavity, A15-Side wall boss, A16-Shaft hole, A17-Annular bushing groove, A21-Valve seat cavity, A22-Positioning boss, A23-Flow guide cavity, A24-Flow guide groove hole, B21-Valve core cone, B22-Valve core body, B41-Valve core front end, B42-Valve core tail end, C11-Beveled protrusion, C61-Fluid through hole, B221-First valve core positioning groove, B222-Valve core sealing groove, B223-Valve core positioning protrusion, B411-Second valve core positioning groove, B421-Second valve core assembly groove. Detailed Implementation

[0036] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0037] Figure 1 This is a structural example diagram of an automotive air conditioning compressor cylinder tightness testing device according to an embodiment of the present invention. Figure 2 This is a cross-sectional structural example of an automotive air conditioning compressor cylinder tightness testing device according to an embodiment of the present invention, as shown in the figure. Figure 1 and Figure 2 As shown, in this embodiment, the automotive air conditioning compressor cylinder tightness testing device includes a housing assembly A, a docking sealing assembly B, a power transmission assembly C, and a fluid circulation assembly D. The docking sealing assembly B is coaxially mounted inside the housing assembly A. The power transmission assembly C is connected to the docking sealing assembly B. The fluid circulation assembly D is mounted at the tail end of the housing assembly A. When the power transmission assembly C drives the docking sealing assembly B to move axially, a test flow channel can be formed inside the housing assembly A. When the docking sealing assembly B is reset, the test flow channel inside the housing assembly A can be closed.

[0038] Figure 3 This is a structural example diagram of a housing assembly according to an embodiment of the present invention, such as... Figure 1 , Figure 2 and Figure 3As shown, in this embodiment, the housing assembly A consists of a front housing A1 and a rear housing A2 fixedly connected to the front housing A1. According to other embodiments of the present invention, the housing assembly A is formed integrally from the front housing A1 and the rear housing A2. The inner side of the front housing A1, which is a body of revolution (i.e., the structure of the front housing A1 is axially symmetrical), is sequentially and coaxially connected to a guide cone hole A11, a valve core sliding hole A12, a first cavity A13, and a second cavity A14. The rear end face of the guide cone hole A11 is smaller than the front end face of the valve core sliding hole A12; both are cone-shaped holes. The first cavity A13 and the second cavity A14 are both circular through holes, and the rear end face of the valve core sliding hole A12 is equal to the front end face of the first cavity A13. A side wall boss A15 is integrally connected to the shell wall of the front shell A1 outside the second cavity A14. A shaft hole A16 communicating with the second cavity A14 is provided on the inner side of the side wall boss A15. Two annular bushing grooves A17 are symmetrically arranged in the second cavity A14 along the axial direction of the shaft hole A16.

[0039] The rear housing A2 is a rotating body. A valve seat cavity A21 is provided on the inner side of one end of the rear housing A2. A positioning boss A22 extending into the valve seat cavity A21 is provided on the inner side of the other end of the rear housing A2. A flow guide cavity A23 and a flow guide groove hole A24 are coaxially arranged from the inside to the outside along the axial direction on the inner side of the positioning boss A22.

[0040] like Figure 2 and Figure 3 As shown, in the cylinder tightness testing device for automotive air conditioning compressors of this embodiment, the mating sealing assembly B includes a guide cone portion B1, a first valve core B2, a sealing ring B3, and a second valve core B4. The guide cone portion B1 is adapted to be installed in the guide cone hole A11 of the front housing A1. The first valve core B2 is coaxially disposed in the valve core sliding hole A12 and the first cavity A13 of the front housing A1. The sealing ring B3 is disposed between the first valve core B2 and the first cavity A13 of the front housing A1. The second valve core B4 is coaxially disposed in the valve seat cavity A21 of the rear housing A2.

[0041] Figure 4 This is a structural example diagram of the first valve core according to an embodiment of the present invention, as shown below. Figure 4 As shown, the first valve core B2 is composed of a valve core cone B21 and a valve core body B22. The small end of the valve core cone B21 is integrally connected to the valve core body B22. A first valve core positioning groove B221 is provided on the inner side of the end of the valve core body B22, and an annular valve core sealing groove B222 is provided on the outer side of the valve core body B22. The valve core sealing groove B222 is used to assemble the sealing ring B3. An annular valve core positioning protrusion B223 is integrally connected to the side of the valve core body B22 near the valve core cone B21.

[0042] Figure 5 This is a structural example diagram of the second valve core according to an embodiment of the present invention, as shown below. Figure 5As shown, in this embodiment, the second valve core B4 is composed of a valve core front end B41 and a valve core tail end B42. The valve core front end B41 is coaxially provided with a second valve core positioning groove B411 with one end open, and the valve core tail end B42 is coaxially provided with a second valve core assembly groove B421 with one end open. The second valve core assembly groove B421 is coaxially assembled on the outside of the positioning boss A22 of the rear housing A2.

[0043] Figure 6 A partial cross-sectional view of the automotive air conditioning compressor cylinder tightness testing device according to an embodiment of the present invention is shown below. Figures 1 to 6 As shown, in this embodiment, the power transmission assembly C includes a push rod C1, a pressure rod C2, an inclined slider C3, a first elastic element C4, and a second elastic element C5. The push rod C1 is coaxially disposed inside the housing assembly A. One end of the push rod C1 is fitted into the first valve core positioning groove B221 of the first valve core B2, and the other end of the push rod C1 is fitted into the second valve core positioning groove B411 of the second valve core B4. An inclined protrusion C11 is integrally connected to the upper part of the push rod C1. The pressure rod C2 is fitted into the shaft hole A16 of the front housing A1. The inclined slider C3 is fixedly fitted into the bottom end of the pressure rod C2. The bottom of the inclined slider C3 has an inclined surface that matches the inclined protrusion C11 on the push rod C1. The first elastic element C4 is disposed outside the first valve core B2 inside the valve core sliding hole A12, and the second elastic element C5 is disposed outside the positioning boss A22 at one end of the second valve core B4.

[0044] Figure 7 This is a cross-sectional example of the second partial structure of the automotive air conditioning compressor cylinder tightness testing device according to an embodiment of the present invention. Figure 8 This is a cross-sectional example of the third partial structure of the automotive air conditioning compressor cylinder tightness testing device according to an embodiment of the present invention, as shown in the figure. Figures 1 to 8 As shown, as an optional example, in this embodiment, one end of the first elastic member C4 is fixedly connected to the end face of the valve core sliding hole A12, the other end of the first elastic member C4 is fixedly connected to the valve core positioning protrusion B223, one end of the second elastic member C5 is fixedly connected to the valve core tail end B42 of the second valve core B4, and the other end of the second elastic member C5 is fixedly connected to the bottom end of the valve seat cavity A21.

[0045] In practical applications, when the pressure rod C2 presses down to drive the push rod C1 forward, the resulting thrust pushes the first valve core B2 forward, while the resulting tension pulls the second valve core B4 to move synchronously. At this time, the first elastic element C4 is compressed, and the second elastic element C5 is stretched. Subsequently, when the pressure rod C2 pulls up, the self-elastic restoring force of the first and second elastic elements C4 and C5 drives the first valve core B2 and the second valve core B4 to complete their reset.

[0046] In practical applications, when the first valve core B2 moves forward, the valve core cone B21 separates from the guide cone B1, and the sealing ring B3 enters the valve core sliding hole A12 along with the first valve core B2, disengaging from the sealing state and forming an annular conical gap. Simultaneously, the second valve core B4 moves forward, and its tail end B42 separates from the positioning boss A22, forming an annular gap. The through-channel formed by these two components allows for stable liquid flow within the device.

[0047] Two bushings C6 are fitted onto the outside of the push rod C1 and fixed in the annular bushing groove A17 on the inner side of the front housing A1. The bushings C6 are circular in shape, and multiple fluid through holes C61 are circumferentially distributed on the bushings C6. For example, in practical applications, the fluid through holes C61 can be designed as a composite structure with tapered ends and a cylindrical middle, which can reduce the resistance to medium flow and make the medium evenly distributed along the outer circumference of the push rod C1, avoiding excessive local flow velocity that could erode and wear the push rod.

[0048] In practical applications, when the pressure rod C2 is pressed down, the inclined slider C3 at the bottom of the pressure rod C2 moves down synchronously. The bottom inclined surface of the inclined slider C3 interacts with the inclined protrusion C11 of the push rod C1, causing the push rod C1 to move axially towards the outlet of the front housing A1.

[0049] Figure 9 This is a structural example diagram of a fluid circulation assembly according to an embodiment of the present invention, such as... Figures 1 to 9 As shown, in this embodiment, the fluid circulation assembly D includes a guide cone D1, a pump body D2, and a liquid storage tank D3 connected in sequence. The inner end of the guide cone D1 is adapted to be installed in the guide slot A24 of the rear housing A2.

[0050] The application principle of the automotive air conditioning compressor cylinder tightness testing device in this embodiment of the invention is as follows:

[0051] In the initial state, the device is sealed and ready: the valve core cone B21 of the first valve core B2 fits against the guide cone B1 to form a conical seal, and the sealing ring B3 fits against the inner wall of the first cavity A13 of the front housing A1 to form a radial seal; the valve core tail end B42 of the second valve core B4 fits against the positioning boss A22 of the rear housing A2 to form an end face seal, and the triple seal blocks the flow of fluid. In the power transmission assembly C, the pressure rod C2 is in the initial position, the inclined slider C3 is initially engaged with the inclined protrusion C11 of the push rod C1, and the first elastic element C4 and the second elastic element C5 are in their natural state.

[0052] During testing, the guide cone B1 is aligned with the cylinder test port, and an axial thrust is applied until the cone surfaces are fully engaged. The friction of the cone surfaces creates a self-locking effect to prevent loosening during testing. Then, the pressure rod C2 is pressed, causing the inclined slider C3 to move downwards. The inclined plane pushes the push rod C1 forward, causing the first valve core B2 to move forward along the valve core sliding hole A12, and the second valve core B4 to move forward along the valve seat cavity A21 of the rear housing A2. At this time, the valve core cone B21 of the first valve core B2 separates from the guide cone B1, forming an annular conical gap. The sealing ring B3 enters the valve core sliding hole A12, disengaging from the sealing state and forming a flow gap. The valve core tail end B42 of the second valve core B4 separates from the positioning boss A22, forming an annular gap. Simultaneously, the first elastic element C4 is compressed, and the second elastic element C5 is stretched.

[0053] After the two valve cores are opened, each gap forms a continuous flow channel with the fluid through hole C61 of the first cavity A13, the second cavity A14, and the bushing C6. The test medium flows in from the rear housing A2 side and flows out from the front housing A1 side, entering the cylinder to be tested to complete the test.

[0054] After the test is completed, the pressure rod C2 is released. Under the restoring force of the first elastic element C4 and the second elastic element C5, the push rod C1 resets and drives the double valve core to move back, and the device returns to its initial sealing state.

[0055] Subsequently, the fluid circulation component D is started, and the pump body D2 generates negative pressure. The residual liquid enters the pump body D2 through the guide cavity A23, the guide groove hole A24, and the guide cone D1, and is finally stored in the storage tank D3 for recycling, avoiding pollution and waste.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A device for testing the airtightness of an automotive air conditioning compressor cylinder connection, characterized in that, The airtightness testing device includes a housing assembly (A), a docking sealing assembly (B), a power transmission assembly (C), and a fluid circulation assembly (D). The docking sealing assembly (B) is coaxially mounted inside the housing assembly (A), the power transmission assembly (C) is connected to the docking sealing assembly (B), and the fluid circulation assembly (D) is mounted at the tail end of the housing assembly (A). The housing assembly (A) includes a rigidly connected front housing (A1) and a rear housing (A2). The inner side of the front housing (A1) is sequentially and coaxially provided with a communicating guide cone hole (A11), a valve core sliding hole (A12), a first cavity (A13), and a second cavity. The body (A14) has a sidewall boss (A15) on its outer side, and a shaft hole (A16) communicating with the second cavity (A14) is opened on the inner side of the sidewall boss (A15). Two annular bushing grooves (A17) are symmetrically arranged along the shaft hole (A16) inside the second cavity (A14). The rear housing (A2) has a valve seat cavity (A21) on the inner side of one end, and a positioning boss (A22) extending towards the valve seat cavity (A21) on the inner side of the other end. A flow guide cavity (A23) and a flow guide groove hole (A24) are coaxially arranged inside the positioning boss (A22). The docking sealing assembly (B) includes a guide cone (B1), a first... The valve core (B2), sealing ring (B3), and second valve core (B4) are arranged. The guide cone (B1) is assembled in the guide cone hole (A11). The first valve core (B2) is coaxially arranged in the valve core sliding hole (A12) and the first cavity (A13). The sealing ring (B3) is arranged between the first valve core (B2) and the first cavity (A13). The second valve core (B4) is coaxially arranged in the valve seat cavity (A21). The first valve core (B2) is composed of the valve core cone (B21) and the valve core body (B22). The valve core body (B22) is provided with the first valve core positioning groove (B221), the valve core sealing groove (B222), and the valve core. The positioning protrusion (B223) and the second valve core (B4) are composed of a valve core front end (B41) and a valve core tail end (B42). The valve core front end (B41) is provided with a second valve core positioning groove (B411), and the valve core tail end (B42) is provided with a second valve core assembly groove (B421). The sealing state of the docking sealing assembly is that the valve core cone (B21) of the first valve core (B2) fits with the guide cone (B1) to form a conical surface seal, the sealing ring (B3) fits with the inner wall of the first cavity (A13) to form a radial seal, and the valve core tail end (B42) of the second valve core (B4) fits with the positioning protrusion (A22) to form an end face seal.The power transmission assembly (C) includes a push rod (C1), a pressure rod (C2), a sloping slider (C3), a first elastic element (C4), and a second elastic element (C5). One end of the push rod (C1) is fitted into the first valve core positioning groove (B221) of the first valve core (B2), and the other end is fitted into the second valve core positioning groove (B411) of the second valve core (B4). The push rod (C1) has a sloping protrusion (C11) on its upper side. The pressure rod (C2) is fitted into the shaft hole (A16). The sloping slider (C3) is fixed to the bottom end of the pressure rod (C2), and its bottom sloping surface matches the sloping protrusion (C11) of the push rod (C1). The bushing (C6) is fitted into the annular bushing groove (A16). 17) Inside, a first elastic element (C4) is located outside the first valve core (B2), and a second elastic element (C5) is located outside the positioning boss (A22); the two ends of the first elastic element (C4) are respectively connected to the end face of the valve core sliding hole (A12) and the valve core positioning protrusion of the first valve core (B2), and the two ends of the second elastic element (C5) are respectively connected to the valve core tail end (B42) of the second valve core (B4) and the bottom end of the valve seat cavity (A21); the fluid circulation assembly (D) includes a guide cone (D1) assembled in the guide slot hole (A24) of the rear housing (A2), and a pump body (D2) and a liquid storage tank (D3) sequentially connected to the guide cone (D1).

2. The airtightness testing device according to claim 1, characterized in that, The push rod (C1) converts the vertical movement of the pressure rod (C2) into axial movement through the inclined surface cooperation of the inclined surface slider (C3) and the inclined surface protrusion (C11), driving the first valve core (B2) and the second valve core (B4) to open and close synchronously.

3. The airtightness testing device according to claim 1, characterized in that, The bushing (C6) contains a plurality of circumferentially distributed fluid through holes (C61) that are tapered at both ends and cylindrical in the middle.

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