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

Abstract

The invention 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] The present invention belongs to the technical field of compressor variable displacement solenoid valves, and particularly relates to a compressor variable displacement solenoid valve for preventing micro-leakage failure of a bellows. Background Art

[0002] In an automotive air conditioning system, a compressor variable solenoid valve plays a key control role. Currently, in common compressor variable solenoid valves, the pressure sensing element mostly adopts a bellows assembly. The bellows assembly senses pressure changes through a bellows with internal vacuum to control the operation of the solenoid valve. However, there are many problems with the existing bellows.

[0003] Since the bellows housing is a thin-walled part, an internal vacuum is usually formed by a vacuum welding process. It is very difficult for the existing welding process to ensure that there are no defects at the bellows weld. Although some obvious leakage problems can be detected through relevant airtightness tests, it is impossible to effectively detect micro-leakage with an annual leakage rate less than 1 g / year. At the same time, in the actual working environment of the compressor, the bellows needs to be in a pressure environment of 0.3 MPa to 0.8 MPa for a long time, and its own volume is only 0.5 ml to 0.8 ml. Therefore, extremely small leakage may cause external refrigerant to enter the inside of the bellows, thereby causing the pressure sensing function of the bellows to fail, and ultimately resulting in the compressor being unable to refrigerate and the vehicle air conditioning system being unable to work properly. This not only affects the performance of the automotive air conditioning system, but also increases the maintenance cost and user inconvenience. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a compressor variable displacement solenoid valve for preventing micro-leakage failure of a bellows, which solves the problem of solenoid valve failure caused by micro-leakage of the bellows.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a compressor variable displacement solenoid valve for preventing micro-leakage failure of a bellows, including an electromagnetic coil assembly, a housing, a guide sleeve, and a fixed iron core and an electromagnetic drive assembly disposed in the guide sleeve. It is characterized in that: the guide sleeve is connected to the top of the valve body, and the valve body is sequentially provided with a first cavity, a guiding through hole, and a second cavity that are connected to each other from top to bottom. The first cavity is communicated with the inner cavity of the guide sleeve. The valve body is provided with an air inlet port communicated with the first cavity, a swash plate port communicated with the second cavity, and an exhaust port communicated with the guiding through hole; Wherein, a valve core is movably embedded in the guiding through hole, a valve plug portion disposed 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 return spring for driving the valve plug portion to block the end opening of the guiding through hole is disposed in the second cavity; A bellows assembly is provided at the bottom of the inner cavity for driving the electromagnetic drive assembly to press down the valve core, so as to connect the exhaust port and the second cavity through an annular groove provided on the valve core, and the outer periphery of the bottom of the bellows assembly is sealed with the inner wall of the guide sleeve, and the interior of the bellows assembly can communicate with the outside world through a first through hole provided at the bottom thereof and a second through hole provided on the electromagnetic coil assembly and the guide sleeve.

[0006] Optionally, a plugging cover is threadedly connected to the bottom of the second cavity, and two ends of the return spring are respectively supported on the valve plug portion and the plugging cover.

[0007] Optionally, the electromagnetic drive assembly includes a moving iron core and a push rod, the push rod is movably inserted into 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, and the end of the moving iron core facing away from the push rod is connected to the valve core, and the valve core, the moving iron core and the push rod can move synchronously.

[0008] Optionally, the bellows assembly is tightly connected to the inner wall of the guide sleeve via a first sealing ring.

[0009] Optionally, a plurality of second sealing rings are arranged on the outer periphery of the shell and the valve body.

[0010] Optionally, the push rod, the bellows assembly, the return spring, the moving iron core, the valve core, and the guide through hole are coaxially arranged, and the clearance between the push rod and the fixed iron core is matched, the clearance between the moving iron core and the inner cavity is matched, and the clearance between the valve core and the guide through hole is matched.

[0011] Optionally, a pressure balancing through hole is provided on the moving iron core, and the pressure balancing through hole can connect the first cavity and the inner cavity.

[0012] Optionally, the number of the exhaust ports is four, and the four exhaust ports are arranged in a circular array along the guide through hole.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the valve body has a multi-channel connection design, the air intake port is connected to the first cavity, the inclined plate port is connected to the second cavity, and the guide through hole is connected to the exhaust port, and the valve core is driven up and down in both directions by the electromagnetic drive component and the bellows component, and the opening of the valve port between the valve plug on the valve core and the opening at the end of the guide through hole is flexibly controlled, so as to flexibly adjust the compressor displacement. The bellows component is sealed and connected to the inner cavity of the guide sleeve, and communicates with the outside world through the first through hole set at its bottom and the second through hole set on the electromagnetic coil component and the guide sleeve, so that when the bellows component has a slight leakage, it will not cause the compressor displacement to fail, thereby improving the overall performance of the compressor displacement solenoid valve, and also improving the reliability of the automobile air conditioning system. Brief Description of the Drawings

[0014] The present invention will be further described below in conjunction with the drawings and embodiments.

[0015] Figure 1 is a schematic cross-sectional structure diagram of a variable displacement solenoid valve of a compressor for preventing micro-leakage failure of a bellows in a preferred embodiment of the present invention; Figure 2 is in a preferred embodiment of the present invention Figure 1 A partial enlarged structure diagram at B; Wherein, 1. electromagnetic coil assembly; 2. housing; 201. inner cavity; 3. fixed iron core; 401. moving iron core; 4011. pressure balance through hole; 402. ejector rod; 5. valve body; 501. first cavity; 502. guiding through hole; 503. second cavity; 504. suction port; 505. swash plate port; 506. exhaust port; 6. valve core; 601. valve plug part; 602. annular groove port; 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 Description of the Invention

[0016] The present invention will now be further described in detail in conjunction with the drawings and embodiments. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0017] It should be noted that if there are directional indications (such as up, down, bottom, top, etc.) involved in this embodiment, then such directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, then such directional indications will also change accordingly. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. Unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

[0018] Such as Figure 1 - Figure 2As shown in the figure, a variable displacement solenoid valve for a compressor to prevent micro-leakage failure of a bellows pipe includes an electromagnetic coil assembly 1, a housing 2, a guide sleeve 12, a fixed iron core 3 disposed in 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, and 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 is hermetically connected between the guide sleeve 12 and the valve body 5. The valve body 5 is sequentially provided with a first cavity 501, a guiding through hole 502, and a second cavity 503 that communicate with each other from top to bottom. The first cavity 501 communicates with the inner cavity 201 of the guide sleeve 12. The valve body 5 is provided with an air inlet 504 communicating with the first cavity 501, a swash plate port 505 communicating with the second cavity 503, and an exhaust port 506 communicating with the guiding through hole 502. Among them, a valve core 6 is movably embedded in the guiding through hole 502. A valve plug portion 601 disposed at one end of the valve core 6 is located in the second cavity 503. The other end of the valve core 6 is fixedly connected to the electromagnetic drive assembly. A return spring 7 for driving the valve plug portion 601 to block the end opening of the guiding through hole 502 is disposed in the second cavity 503. At the same time, a bellows pipe assembly 8 for driving the electromagnetic drive assembly to press down the valve core 6 is disposed at the bottom of the inner cavity 201, so as to communicate the exhaust port 506 with the second cavity 503 through an annular notch 602 provided on the valve core 6, and the outer periphery of the bottom of the bellows pipe assembly 8 is hermetically connected to the inner wall of the guide sleeve 12. Specifically, for the variable displacement solenoid valve of the present technical solution, when the electromagnetic coil is not energized, the acting force of the bellows pipe assembly 8 on the electromagnetic drive assembly is sufficient to offset 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 downward, so that the exhaust port 506 communicates with the second cavity 503 through the guiding through hole 502. And when the electromagnetic coil assembly 1 is energized, the electromagnetic drive assembly can compress the bellows pipe assembly 8 upward under the action of electromagnetic force. At the same time, under the supporting action of the return spring 7, the valve core 6 can also move upward along with the electromagnetic drive assembly. Since a valve port can be formed between the valve plug portion 601 on the valve core 6 and the end opening of the guiding through hole 502, the opening degree of the valve port can be adjusted by controlling the upward movement distance of the electromagnetic drive assembly, so as to adjust the displacement of the compressor. 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 pipe assembly 8, and the reaction force of the spring assembled on the bellows pipe assembly 8 itself. By controlling the pressure of the refrigerant and the magnitude of the electromagnetic force, it can be achieved by existing technical means, so that the displacement distance of the valve core 6 can be accurately controlled.

[0019] At the same time, compared with the traditional bellows assembly 8, when a micro-leakage occurs, the internal vacuum will be destroyed and the pressure sensing function will fail. The interior of the bellows assembly 8 in the present technical solution can communicate with the outside world through the first through hole 801 set at the bottom thereof and the second through hole 802 set on the electromagnetic coil assembly 1 and the guide sleeve 12, so that the pressure inside the bellows assembly 8 can be equal to the atmospheric pressure, and because the fluctuation of atmospheric pressure is very small and the frequency of fluctuation within 24 hours is extremely low, even if a micro-leakage occurs in the bellows assembly 8, the compressor variable displacement will not fail.

[0020] It should be noted that when the compressor variable displacement solenoid valve in the technical solution is installed in the air conditioning system of the automobile, the refrigerant in the suction chamber of the compressor can enter the first cavity 501 through the suction port 504, and the refrigerant can also enter the inner cavity 201 of the guide sleeve 12 provided with the bellows assembly 8 through the gap between the electromagnetic drive assembly and the fixed iron core 3 and the pressure balance through hole 4011 provided on the moving iron core 401, and 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 can determine the position of the end surface 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 the valve core 6 to move upward or downward, thereby adjusting the refrigerant flow from the exhaust port 506 to the inclined plate port 505, and achieving the effect of automatically adjusting the refrigeration displacement of the compressor.

[0021] As mentioned above, when the compressor variable displacement solenoid valve in the present 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 inclined plate port 505 can be connected to the swing chamber of the compressor, and the intake port 504 can be connected to the suction cup chamber of the compressor.

[0022] In this embodiment, the electromagnetic drive assembly includes a moving iron core 401 and a push rod 402. The push rod 402 is movably arranged in 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 that is 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.

[0023] Further, such as Figure 1 As shown, the bottom of the second cavity 503 is threadedly connected with a plug 9, and the two ends of the reset spring 7 are respectively supported on the valve plug 601 and the plug 9. By adjusting the screwing depth of the plug 9, the initial elastic force of the reset spring 7 acting on the valve core 6 can be adjusted, thereby adjusting the initial opening of the valve port when the electromagnetic coil assembly 1 is powered off.

[0024] At the same time, if Figure 1As shown, the bellows assembly 8 is tightly connected to the inner wall of the guide sleeve 12 through the 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. And a number of second sealing rings 11 are provided on the outer perimeters of the housing 2 and the valve body 5 to cut off the communication path outside the valve body 5 between the exhaust port 506, the swash plate port 505, and the suction port 504 when the variable displacement compressor solenoid valve is installed on the automotive air conditioning system.

[0025] In this embodiment, the ejector rod 402, the bellows assembly 8, the return spring 7, the moving iron core 401, the valve core 6, and the guiding through hole 502 are coaxially arranged. And there is a clearance fit between the ejector rod 402 and the fixed iron core 3, a clearance fit between the moving iron core 401 and the inner cavity 201, and a clearance fit between the valve core 6 and the guiding through hole 502 to ensure the precise movement of each component. At the same time, there are four exhaust ports 506, and the four exhaust ports 506 are arranged in a circular array along the guiding through hole 502.

[0026] Working principle: When the electromagnetic coil is not energized, the acting force of the bellows assembly 8 on the electromagnetic drive assembly is sufficient to offset 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 downward, so that the exhaust port 506 communicates with the second cavity 503 through the guiding through hole 502. And when the electromagnetic coil assembly 1 is energized, the electromagnetic drive assembly can compress the bellows assembly 8 upward under the action of the electromagnetic force. At the same time, under the supporting action of the return spring 7, the valve core 6 can also move upward with the electromagnetic drive assembly. And since a valve port can be formed between the valve plug portion 601 on the valve core 6 and the end opening of the guiding through hole 502, the opening degree of the valve port can be adjusted by controlling the upward movement distance of the electromagnetic drive assembly to adjust the displacement of the compressor. At the same time, the bellows assembly 8 will elongate or shorten when the pressure of the refrigerant entering the first cavity 501 changes, thereby driving the electromagnetic drive assembly and the valve core 6 to move upward or downward, so as to adjust the refrigerant flow rate flowing from the exhaust port 506 to the swash plate port 505, achieving the effect of automatically adjusting the refrigeration displacement of the compressor.

[0027] Based on the ideal embodiments of the present invention as inspiration, through the above description, relevant personnel can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A variable displacement solenoid valve for a compressor that prevents failure due to micro-leakage of a bellows, comprising an electromagnetic coil assembly (1), a housing (2), a guide sleeve (12), a fixed iron core (3) disposed in 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 through hole (502) and a second cavity (503) which are connected to each other in sequence from the top to the 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 port (504) connected to the first cavity (501), a slanted plate port (505) connected to the second cavity (503) and an air discharge port (506) connected to the guide through hole (502); A valve core (6) is movably embedded in the guide through hole (502); a valve plug portion (601) arranged at one end of the valve core (6) is located in 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 arranged in the second cavity (503) for driving the valve plug portion (601) to block the end opening of the guide through hole (502); A bellows assembly (8) for driving the electromagnetic drive assembly to press down the valve core (6) is arranged at the bottom of the inner cavity (201), so as to connect the exhaust port (506) and the second cavity (503) through an annular notch (602) arranged on the valve core (6), and the outer periphery of the bottom of the bellows assembly (8) is sealedly connected to the inner wall of the guide sleeve (12), and the interior of the bellows assembly (8) can communicate with the outside through a first through hole (801) arranged at the bottom thereof and a second through hole (802) arranged on the electromagnetic coil assembly (1) and the guide sleeve (12).

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

3. The variable displacement solenoid valve for compressors to prevent bellows micro-leakage failure according to claim 2 is characterized in that: The electromagnetic drive assembly comprises a moving iron core (401) and a push rod (402); the push rod (402) is movably arranged in 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); and the end of the moving iron core (401) 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) are capable of moving synchronously.

4. The compressor variable displacement solenoid valve for preventing bellows micro-leakage failure according to claim 1 is characterized in that: The bellows assembly (8) and the inner wall of the guide sleeve (12) are tightly connected via 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: A plurality of second sealing rings (11) are provided on the outer peripheries of the housing (2) and the valve body (5).

6. The variable displacement solenoid valve for compressors to prevent bellows micro-leakage failure according to claim 3 is characterized by: The push rod (402), the bellows assembly (8), the return spring (7), the moving iron core (401), the valve core (6), and the guide through hole (502) are coaxially arranged, and there is a clearance fit between the push rod (402) and the fixed iron core (3), there is a clearance fit between the moving iron core (401) and the inner cavity (201), and there is a clearance fit between the valve core (6) and the guide through hole (502).

7. The compressor variable displacement solenoid valve for preventing bellows micro-leakage failure according to claim 3 is characterized by: The moving iron core (401) is provided with a pressure balancing through hole (4011), and the pressure balancing through hole (4011) 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 is characterized in that: The number of the 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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