Compressor variable displacement electromagnetic valve capable of preventing corrugated pipe from micro-leakage failure

Abstract

The utility model discloses a compressor variable displacement electromagnetic valve capable of preventing a corrugated pipe from micro-leakage failure, and belongs to the technical field of compressor variable displacement electromagnetic valves. Comprising an electromagnetic coil assembly, a shell, a guide sleeve, a fixed iron core and an electromagnetic driving assembly, the guide sleeve is connected to the top of a valve body, the valve body is provided with a first cavity, a guide through hole and a second cavity, the first cavity is communicated with an inner cavity of the guide sleeve, and the valve body is provided with an air suction port, a swash plate port and an exhaust port; a valve element is movably embedded in the guide through hole, a valve plug part arranged at one end of the valve element is located in the second cavity, and a reset spring is arranged in the second cavity. A corrugated pipe assembly is arranged at the bottom of the inner cavity, an annular notch formed in the valve element can communicate with the exhaust port and the second cavity, and the interior of the corrugated pipe assembly can communicate with the outside through the first through hole and the second through hole. According to the compressor variable displacement electromagnetic valve capable of preventing the corrugated pipe from losing efficacy due to micro leakage, the problem that the electromagnetic valve loses efficacy due to micro leakage of the corrugated pipe is solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of compressor variable displacement solenoid valves, specifically relating to a compressor variable displacement solenoid valve that prevents bellows micro-leakage failure. Background Technology

[0002] In automotive air conditioning systems, the compressor variable displacement solenoid valve plays a crucial control role. Currently, most commonly used compressor variable displacement solenoid valves employ bellows assemblies as the pressure sensing element. The bellows assembly senses pressure changes through an internally vacuumed bellows, thereby controlling the solenoid valve's operation. However, existing bellows have several problems.

[0003] Because the bellows shell is a thin-walled component, it typically employs vacuum welding to create an internal vacuum. Current welding techniques struggle to guarantee the absence of defects at the bellows weld seams. While some obvious leaks can be detected through airtightness testing, minute leaks with an annual leakage rate of less than 1g / year are difficult to detect effectively. Furthermore, in the actual operating environment of the compressor, the bellows operates under pressures of 0.3MPa to 0.8MPa for extended periods, with a volume of only 0.5ml to 0.8ml. Therefore, even extremely small leaks can allow external refrigerant to enter the bellows, causing it to lose its pressure-sensing function and ultimately preventing the compressor from cooling and the entire vehicle's air conditioning system from functioning properly. This not only affects the performance of the automotive air conditioning system but also increases maintenance costs and user inconvenience. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a compressor variable displacement solenoid valve that prevents bellows micro-leakage failure, thus solving the problem of solenoid valve failure caused by bellows micro-leakage.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a compressor variable displacement solenoid valve for preventing bellows micro-leakage failure, comprising an electromagnetic coil assembly, a housing, a guide sleeve, and a fixed iron core and an electromagnetic drive assembly disposed within the guide sleeve, characterized in that: the guide sleeve is connected to the top of the valve body, and the valve body is provided with a first cavity, a guide through hole, and a second cavity that are interconnected from top to bottom, the first cavity being connected to the inner cavity of the guide sleeve, and the valve body being provided with an intake port communicating with the first cavity, a swash plate port communicating with the second cavity, and an exhaust port communicating with the guide through hole;

[0006] Wherein, a valve core is movably embedded in the guide through hole, a valve plug part located at one end of the valve core is located in the second cavity, the other end of the valve core is fixedly connected to the electromagnetic drive assembly, and a reset spring for driving the valve plug part to block the opening at the end of the guide through hole is provided in the second cavity;

[0007] The bottom of the inner cavity is provided with a bellows assembly for driving the electromagnetic drive assembly to press down the valve core, so as to connect the exhaust port and the second cavity through the annular groove provided on the valve core, and the bottom outer periphery of the bellows assembly is sealed to the inner wall of the guide sleeve. The interior of the bellows assembly can communicate with the outside through the first through hole provided at its bottom and the second through hole provided on the electromagnetic coil assembly and the guide sleeve.

[0008] Optionally, a plug is threaded to the bottom of the second cavity, and the two ends of the reset spring are respectively supported by the valve plug and the plug.

[0009] Optionally, the electromagnetic drive assembly includes a moving iron core and a push rod. The push rod is movably inserted through the fixed iron core. One end of the push rod is connected to the bellows assembly, and the other end is connected to the moving iron core. The end of the moving iron core facing away from the push rod is connected to the valve core. The valve core, the moving iron core, and the push rod can move synchronously.

[0010] Optionally, the bellows assembly is tightly connected to the inner wall of the guide sleeve by a first sealing ring.

[0011] Optionally, the outer periphery of the housing and the valve body is provided with a plurality of second sealing rings.

[0012] Optionally, the push rod, the bellows assembly, the return spring, the moving iron core, the valve core, and the guide through hole are arranged coaxially, with the push rod and the fixed iron core having a clearance fit, the moving iron core having a clearance fit with the inner cavity, and the valve core having a clearance fit with the guide through hole.

[0013] Optionally, the moving iron core is provided with a pressure balancing through hole, which can connect the first cavity and the inner cavity.

[0014] Optionally, the number of exhaust ports is four, and the four exhaust ports are arranged in a circumferential array along the guide through hole.

[0015] Compared with existing technologies, the beneficial effects achieved by this utility model are as follows: The valve body features a multi-channel interconnection design, connecting the first cavity through the intake port, the second cavity through the slanted plate port, and the exhaust port through the guide through hole. The valve core is bidirectionally driven up and down by the electromagnetic drive assembly and the bellows assembly, flexibly controlling the opening degree between the valve plug on the valve core and the end opening of the guide through hole, thereby flexibly adjusting the compressor displacement. The bellows assembly is sealed within the inner cavity of the guide sleeve and communicates with the outside through a first through hole at its bottom and a second through hole on the electromagnetic coil assembly and the guide sleeve. This ensures that even a slight leak in the bellows assembly will not cause compressor variable displacement failure, improving the overall performance of the compressor variable displacement solenoid valve and enhancing the reliability of the automotive air conditioning system. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a cross-sectional view of the compressor variable displacement solenoid valve for preventing bellows micro-leakage failure in a preferred embodiment of this utility model.

[0018] Figure 2 This is a preferred embodiment of the present invention. Figure 1 A magnified view of the local structure at point B;

[0019] The components are as follows: 1. Electromagnetic coil assembly; 2. Housing; 201. Inner cavity; 3. Fixed iron core; 401. Moving iron core; 4011. Pressure balance through hole; 402. Push rod; 5. Valve body; 501. First cavity; 502. Guide through hole; 503. Second cavity; 504. Intake port; 505. Slant plate opening; 506. Exhaust port; 6. Valve core; 601. Valve plug; 602. Annular groove; 7. Return spring; 8. Bellows assembly; 801. First through hole; 802. Second through hole; 9. Plug; 10. First sealing ring; 11. Second sealing ring; 12. Guide sleeve. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0021] It should be noted that if directional indicators (such as up, down, bottom, top, etc.) are involved in this embodiment, these directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0022] like Figures 1-2As shown, a compressor variable displacement solenoid valve for preventing bellows micro-leakage failure includes an electromagnetic coil assembly 1, a housing 2, a guide sleeve 12, a fixed iron core 3 disposed within the guide sleeve 12, and an electromagnetic drive assembly. The electromagnetic drive coil is disposed between the housing 2 and the guide sleeve 12, and when the electromagnetic coil assembly 1 is energized, it can drive the electromagnetic drive assembly to move up and down, while the fixed iron core 3 can guide the movement of the electromagnetic drive assembly. Further, the guide sleeve 12 is connected to the top of the valve body 5, and the guide sleeve 12 and the valve body 5 are sealed together. The valve body 5 is provided with a first cavity 501, a guide through hole 502, and a second cavity 503 that are interconnected from top to bottom. The first cavity 501 is connected to the inner cavity 201 of the guide sleeve 12. The valve body 5 is provided with an intake port 504 that communicates with the first cavity 501, a slant plate port 505 that communicates with the second cavity 503, and an exhaust port 506 that communicates with the guide through hole 502. A valve core 6 is movably embedded within the guide hole 502. A valve plug 601 located at one end of the valve core 6 is situated within the second cavity 503. The other end of the valve core 6 is fixedly connected to the electromagnetic drive assembly. A return spring 7 is provided within the second cavity 503 to drive the valve plug 601 to block the opening at the end of the guide hole 502. Simultaneously, a bellows assembly 8 is provided at the bottom of the inner cavity 201 to drive the electromagnetic drive assembly to press down the valve core 6, connecting the exhaust port 506 and the second cavity 503 through an annular groove 602 on the valve core 6. The outer periphery of the bottom of the bellows assembly 8 is sealed to the inner wall of the guide sleeve 12. Specifically, in the compressor variable displacement solenoid valve of this technical solution, when the electromagnetic coil is not energized, the force exerted by the bellows assembly 8 on the electromagnetic drive assembly is sufficient to counteract the elastic force of the return spring 7, thereby driving the electromagnetic drive assembly and the valve core 6 to compress the return spring 7 downwards, allowing the exhaust port 506 to connect with the second cavity 503 through the guide hole 502. When the electromagnetic coil assembly 1 is energized, the electromagnetic drive assembly can compress the bellows assembly 8 upward under the action of electromagnetic force. Simultaneously, the valve core 6, supported by the return spring 7, can also move upward with the electromagnetic drive assembly. Since a valve port can be formed between the valve plug 601 on the valve core 6 and the end opening of the guide hole 502, the opening degree of the valve port can be adjusted by controlling the upward movement distance of the electromagnetic drive assembly, thereby adjusting the compressor's displacement. In this process, the upward displacement of the valve core 6 depends on the electromagnetic force, the elastic force of the return spring 7, the pressure of the refrigerant acting on the outside of the bellows assembly 8, and the reaction force of the spring mounted on the bellows assembly 8 itself. Controlling the refrigerant pressure and the magnitude of the electromagnetic force can be achieved using existing technologies, thus allowing for precise control of the valve core 6's displacement distance.

[0023] Meanwhile, unlike traditional bellows assemblies 8 which suffer from internal vacuum failure and pressure sensing malfunction due to micro-leakage, the bellows assembly 8 in this technical solution allows communication with the outside world through a first through-hole 801 at its bottom and a second through-hole 802 on the electromagnetic coil assembly 1 and the guide sleeve 12. This ensures that the internal pressure of the bellows assembly 8 is equivalent to atmospheric pressure. Furthermore, because atmospheric pressure fluctuations are minimal and occur at extremely low frequencies within 24 hours, even micro-leakage in the bellows assembly 8 will not cause compressor displacement failure.

[0024] It should be noted that when the compressor variable displacement solenoid valve in this technical solution is installed in the automotive air conditioning system, the refrigerant in the compressor suction chamber can enter the first cavity 501 through the suction port 504. Simultaneously, the refrigerant can also enter the inner cavity 201 of the guide sleeve 12, where the bellows assembly 8 is located, through the gap between the electromagnetic drive assembly and the stationary iron core 3 and the pressure balance through-hole 4011 on the moving iron core 401. This refrigerant can act on the outside of the bellows assembly 8, and the pressure on the bellows assembly 8 (from the refrigerant) and the spring force inside the bellows assembly 8 determine the position of the end face of the bellows assembly 8 in contact with the electromagnetic drive assembly. That is, the bellows assembly 8 will extend or shorten when the pressure of the refrigerant entering the first cavity 501 changes, thereby driving the electromagnetic drive assembly and valve core 6 to move upward or downward, thus adjusting the refrigerant flow from the exhaust port 506 to the swashplate port 505, achieving the effect of automatically adjusting the compressor's refrigeration displacement.

[0025] As described above, when the compressor variable displacement solenoid valve in this technical solution is installed in the air conditioning system of an automobile, the exhaust port 506 can be connected to the exhaust chamber of the compressor, the swash plate port 505 can be connected to the swash plate chamber of the compressor, and the suction port 504 can be connected to the suction cup chamber of the compressor.

[0026] In this embodiment, the electromagnetic drive assembly includes a moving iron core 401 and a push rod 402. The push rod 402 is movably inserted through the fixed iron core 3. One end of the push rod 402 is connected to the bellows assembly 8, and the other end is connected to the moving iron core 401. The end of the moving iron core 401 facing away from the push rod 402 is connected to the valve core 6. The valve core 6, the moving iron core 401, and the push rod 402 can move synchronously.

[0027] Furthermore, such as Figure 1 As shown, a plug 9 is threadedly connected to the bottom of the second cavity 503, and the two ends of the return spring 7 are supported on the valve plug 601 and the plug 9, respectively. By adjusting the screw depth of the plug 9, the initial elastic force of the return spring 7 on the valve core 6 can be adjusted, thereby adjusting the initial opening degree of the valve port when the electromagnetic coil assembly 1 is de-energized.

[0028] At the same time, such as Figure 1As shown, the bellows assembly 8 and the inner wall of the guide sleeve 12 are tightly connected by a first sealing ring 10 to cut off the communication path between the inside of the bellows assembly 8 and the inner cavity 201 and the first cavity 501 of the guide sleeve 12. Furthermore, several second sealing rings 11 are provided on the outer periphery of the housing 2 and the valve body 5 to isolate the communication path between the exhaust port 506, the swashplate port 505, and the intake port 504 outside the valve body 5 when the variable displacement compressor solenoid valve is installed on the automotive air conditioning system.

[0029] In this embodiment, the push rod 402, bellows assembly 8, return spring 7, moving iron core 401, valve core 6, and guide hole 502 are arranged coaxially. The push rod 402 and fixed iron core 3 are fitted with a clearance fit, the moving iron core 401 and inner cavity 201 are fitted with a clearance fit, and the valve core 6 and guide hole 502 are fitted with a clearance fit to ensure precise operation of each component. Simultaneously, four exhaust ports 506 are provided, and the four exhaust ports 506 are arranged in a circular array along the guide hole 502.

[0030] Working Principle: When the electromagnetic coil is not energized, the force exerted by the bellows assembly 8 on the electromagnetic drive assembly is sufficient to counteract the spring force of the return spring 7, thereby driving the electromagnetic drive assembly and valve core 6 to compress the return spring 7 downwards, allowing the exhaust port 506 to connect with the second cavity 503 through the guide hole 502. When the electromagnetic coil assembly 1 is energized, the electromagnetic drive assembly can compress the bellows assembly 8 upwards under the action of electromagnetic force. Simultaneously, the valve core 6, supported by the return spring 7, can also move upwards with the electromagnetic drive assembly. Since a valve port can be formed between the valve plug 601 on the valve core 6 and the end opening of the guide hole 502, the opening degree of the valve port can be adjusted by controlling the upward movement distance of the electromagnetic drive assembly, thus adjusting the compressor's displacement. Simultaneously, the bellows assembly 8 will extend or shorten when the pressure of the refrigerant entering the first cavity 501 changes, thereby driving the electromagnetic drive assembly and valve core 6 to move upwards or downwards, thus adjusting the refrigerant flow from the exhaust port 506 to the swashplate port 505, achieving the effect of automatically adjusting the compressor's refrigeration displacement.

[0031] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A compressor variable displacement solenoid valve for preventing bellows micro-leakage failure, comprising an electromagnetic coil assembly (1), a housing (2), a guide sleeve (12), a fixed iron core (3) disposed within the guide sleeve (12), and an electromagnetic drive assembly, characterized in that: The guide sleeve (12) is connected to the top of the valve body (5). The valve body (5) is provided with a first cavity (501), a guide hole (502) and a second cavity (503) connected to each other from top to bottom. The first cavity (501) is connected to the inner cavity (201) of the guide sleeve (12). The valve body (5) is provided with an air intake (504) connected to the first cavity (501), a slant plate (505) connected to the second cavity (503) and an exhaust port (506) connected to the guide hole (502). Among them, a valve core (6) is movably embedded in the guide through hole (502), a valve plug (601) located at one end of the valve core (6) is located in the second cavity (503), and the other end of the valve core (6) is fixedly connected to the electromagnetic drive assembly. A return spring (7) is provided in the second cavity (503) for driving the valve plug (601) to block the opening at the end of the guide through hole (502). The bottom of the inner cavity (201) is provided with a bellows assembly (8) for driving the electromagnetic drive assembly to press down the valve core (6), so as to connect the exhaust port (506) and the second cavity (503) through the annular groove (602) provided on the valve core (6), and the bottom outer periphery of the bellows assembly (8) is sealed to the inner wall of the guide sleeve (12). The interior of the bellows assembly (8) can communicate with the outside through the first through hole (801) provided at its bottom and the second through hole (802) provided on the electromagnetic coil assembly (1) and the guide sleeve (12).

2. The compressor variable displacement solenoid valve for preventing bellows micro-leakage failure according to claim 1, characterized in that: The bottom of the second cavity (503) is threaded with a plug (9), and the two ends of the return spring (7) are respectively supported on the valve plug (601) and the plug (9).

3. The compressor variable displacement solenoid valve for preventing bellows micro-leakage failure according to claim 2, characterized in that: The electromagnetic drive assembly includes a moving iron core (401) and a push rod (402). The push rod (402) is movably inserted through the fixed iron core (3). One end of the push rod (402) is connected to the bellows assembly (8), and the other end is connected to the moving iron core (401). The end of the moving iron core (401) facing away from the push rod (402) is connected to the valve core (6). The valve core (6), the moving iron core (401), and the push rod (402) can move synchronously.

4. The compressor variable displacement solenoid valve for preventing bellows micro-leakage failure according to claim 1, characterized in that: The bellows assembly (8) is tightly connected to the inner wall of the guide sleeve (12) by a first sealing ring (10).

5. The compressor variable displacement solenoid valve for preventing bellows micro-leakage failure according to claim 1, characterized in that: The outer periphery of the housing (2) and the valve body (5) is provided with a plurality of second sealing rings (11).

6. The compressor variable displacement solenoid valve for preventing bellows micro-leakage failure according to claim 3, characterized in that: The top rod (402), the bellows assembly (8), the reset spring (7), the moving iron core (401), the valve core (6), and the guide hole (502) are arranged coaxially, and the top rod (402) and the fixed iron core (3) are in clearance fit, the moving iron core (401) and the inner cavity (201) are in clearance fit, and the valve core (6) and the guide hole (502) are in clearance fit.

7. The compressor variable displacement solenoid valve for preventing bellows micro-leakage failure according to claim 3, characterized in that: The moving iron core (401) is provided with a pressure balance through hole (4011), which can connect the first cavity (501) and the inner cavity (201).

8. The compressor variable displacement solenoid valve for preventing bellows micro-leakage failure according to claim 1, characterized in that: The number of exhaust ports (506) is four, and the four exhaust ports (506) are arranged in a circular array along the guide through hole (502).

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