A structure of a car-mounted cartridge refrigerant solenoid valve

Abstract

This invention discloses a cartridge-type refrigerant solenoid valve structure for automobiles, comprising a magnetic conductor, a coil, a stationary iron core, a moving iron core, a valve body, and a piston. The magnetic conductor is fitted around the coil, and the stationary iron core is fixedly connected to the magnetic conductor. A sleeve fixedly connected to the stationary iron core is located in the middle of the coil. The moving iron core is located inside the sleeve below the stationary iron core, and a return spring is provided between the moving iron core and the stationary iron core. A connecting sleeve fixedly connected to the sleeve is located below the magnetic conductor, and a valve body with the same inner diameter as the connecting sleeve is fixedly connected to the bottom of the connecting sleeve. The piston is located inside the connecting sleeve, and a pilot hole is provided on the piston. A support spring is provided between the piston and the bottom surface of the valve body. This invention controls the energization of the solenoid coil, attracting the moving iron core in the valve body to move up and down, forming a pressure difference between the upper and lower chambers of the piston, which in turn drives the piston to move up and down. The structure is reasonably designed, highly sensitive, and can significantly improve valve opening performance.

Description

Technical Field

[0001] This invention belongs to the technical field of automotive air conditioning and thermal management systems, specifically relating to a structure of a car-mounted cartridge-type refrigerant solenoid valve. Background Technology

[0002] In recent years, the thermal management of new energy vehicles has developed rapidly. As a refrigerant reversing and regulating device, the refrigerant solenoid valve is widely used in the control system and thermal management system of new energy vehicles. It mainly plays the role of refrigerant circuit switching and reversing. Due to its high reliability and convenient control, it is widely used.

[0003] CN108105454A discloses a refrigerant solenoid valve, which includes a valve body and an electromagnetic coil drive mechanism connected to the valve body. The electromagnetic coil drive mechanism is connected to an internal push rod. The valve body has a refrigerant passage. When the internal push rod is in the extended state, it blocks the refrigerant passage. It has the following advantages: when the solenoid valve is not energized, the internal refrigerant is normally flowing; however, when the electromagnetic coil drive mechanism is energized, the internal push rod's on / off device is activated by electromagnetic force, forming a tight seal with the refrigerant valve body, thereby preventing the flow of refrigerant in the passage and achieving a normally open effect.

[0004] Existing refrigerant solenoid valves still have the following drawbacks: 1) Low sensitivity and poor valve opening performance; 2) Impurities in the refrigerant system can affect the normal movement of the piston and block the pilot orifice, causing the solenoid valve to fail; 3) Cartridge-type refrigerant solenoid valves are mainly used in thermal management integrated modules, where various valves are densely arranged, and the single installation direction of the coil can affect installation; 4) The harsh operating conditions in automobiles and severe vibrations can increase impurities in the refrigerant system, causing the refrigerant solenoid valve to fail within its service life, unable to perform reversing or switching adjustments, thus affecting the normal operation of the air conditioning system and thermal management system, and impacting vehicle use. These are all shortcomings of existing refrigerant solenoid valves that cannot be completely eliminated through existing structural optimizations. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention innovatively proposes a structure for a car-mounted cartridge-type refrigerant solenoid valve.

[0006] The refrigerant solenoid valve structure of this invention has a reasonable structural design and high sensitivity, which can significantly improve valve opening performance.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0008] A cartridge-type refrigerant solenoid valve structure for automobiles includes a magnetic conductor, a coil, a stationary iron core, a moving iron core, a valve body, and a piston. The magnetic conductor is fitted around the coil. The stationary iron core is fixedly connected to the magnetic conductor. A sleeve fixedly connected to the stationary iron core is provided in the middle of the coil. A moving iron core is provided inside the sleeve below the stationary iron core. A return spring is provided between the moving iron core and the stationary iron core. A connecting sleeve fixedly connected to the sleeve is provided below the magnetic conductor. A valve body with the same inner diameter as the connecting sleeve is fixedly connected to the bottom of the connecting sleeve. The piston is provided inside the connecting sleeve. A pilot hole is provided on the piston. A support spring is provided between the piston and the bottom surface of the valve body.

[0009] When the coil is energized, the stationary iron core attracts the moving iron core to move upward, thereby compressing the return spring. Under the action of the refrigerant and the pilot hole, the pressure below the piston is greater than that above, causing the piston to move upward and the valve to open.

[0010] When the coil is de-energized, the moving iron core loses its electromagnetic attraction. Under the action of the reset spring and the pilot hole, the pressure above the piston is greater than that below, causing the piston to move downward and the valve to close.

[0011] Preferably, the pilot hole includes a first pilot hole and a second pilot hole, the first pilot hole is disposed in the middle of the piston, the second pilot hole is disposed to the side of the first pilot hole, and a moving iron core sealing gasket is disposed at the bottom of the moving iron core corresponding to the first pilot hole.

[0012] Preferably, the diameter of the first pilot hole is larger than the diameter of the second pilot hole.

[0013] Preferably, the moving iron core is provided with a balance hole.

[0014] Preferably, the stationary iron core is fixed to the magnetic conductor by external threads and a nut at its top.

[0015] Preferably, a filter screen is fitted onto the outside of the valve body.

[0016] Preferably, the outer wall of the connecting sleeve is provided with connecting threads and a connecting sleeve sealing ring.

[0017] Preferably, a valve port sealing ring is provided on the outer wall of the valve body.

[0018] Preferably, the top of the coil has a protrusion, and the edge of the magnetic conductor is provided with a locking groove in different directions to form a limiting engagement with the protrusion.

[0019] Preferably, the piston is provided with a balance ring.

[0020] Compared with the prior art, the present invention has the following significant advantages:

[0021] This invention features a balance hole on the moving iron core. In a refrigerant environment, the balance hole balances the pressure on the upper and lower parts of the moving iron core, facilitating the coil's energization to attract the moving iron core to move flexibly up and down. Simultaneously, a pilot hole is provided on the piston. When the coil is energized, it attracts the moving iron core to compress the return spring. The refrigerant passes through the pilot hole, causing the pressure below the piston to be greater than above, causing the piston to move upward and the valve to open. This invention offers high sensitivity and can significantly improve valve opening performance.

[0022] This invention presses the magnetic conductor and coil together using threads and nuts on the stationary iron core. The stationary iron core is also fixedly integrated with the sleeve, connecting sleeve, and valve body to form a stable overall structure. This prevents the increase of impurities in the refrigerant system when the car is subjected to severe vibrations, and will not affect the normal operation of the thermal management system.

[0023] The present invention has a filter screen installed at the valve body inlet to ensure that impurities in the refrigerant cannot enter the valve body and to ensure the normal operation of the valve body.

[0024] This invention provides coil mounting positions in different directions of the magnetic conductor, offering multiple mounting positions for customer convenience and allowing selection based on actual needs. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the refrigerant solenoid valve structure of the present invention.

[0026] Figure 2 This is a cross-sectional schematic diagram of the refrigerant solenoid valve structure of the present invention.

[0027] Figure 3 This is a three-dimensional structural diagram of the magnetic conductor in the refrigerant solenoid valve structure of the present invention.

[0028] Figure 4 This is a three-dimensional structural diagram of the coil in the refrigerant solenoid valve structure of the present invention.

[0029] Figure 5 This is a three-dimensional structural diagram of the stationary iron core in the six-channel valve device of the present invention.

[0030] Figure 6 This is a three-dimensional structural diagram of the connecting sleeve in the six-channel valve device of the present invention.

[0031] Figure 7 This is a three-dimensional structural diagram of the piston in the six-channel valve device of the present invention.

[0032] Figure 8 This is a three-dimensional structural diagram of the balance ring in the six-channel valve device of the present invention.

[0033] Figure 9 This is a three-dimensional structural diagram of the valve body in the six-channel valve device of the present invention.

[0034] Figure 10 This is a three-dimensional structural diagram of the filter screen in the six-channel valve device of the present invention.

[0035] Figure 11 This is a three-dimensional structural diagram of the supporting tower spring in the six-channel valve device of the present invention.

[0036] In the diagram: 1. Magnetic conductor; 101. Bayonet; 2. Coil; 21. Protrusion; 3. Stationary iron core; 31. External thread; 32. Nut; 4. Moving iron core; 41. Balance hole; 42. Moving iron core sealing gasket; 5. Valve body; 51. Valve port sealing ring; 6. Piston; 61. Pilot hole; 611. First pilot hole; 612. Second pilot hole; 62. Balance ring; 7. Sleeve; 8. Connecting sleeve; 81. Connecting thread; 82. Connecting sleeve sealing ring; 9. Return spring; 10. Support spring; 11. Filter screen. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present patent. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. For those skilled in the art, the omission of certain well-known structures and their descriptions in the drawings is understandable. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present patent.

[0038] like Figures 1-11 As shown, the present invention discloses a vehicle-mounted cartridge-type refrigerant solenoid valve structure, comprising a magnetic conductor 1, a coil 2, a stationary iron core 3, a moving iron core 4, a valve body 5, and a piston 6. The magnetic conductor 1 is fitted around the coil 2. The stationary iron core 3 is fixedly connected to the magnetic conductor 1. A sleeve 7, fixedly connected to the stationary iron core 3, is provided in the middle of the coil 2. The moving iron core 4 is disposed inside the sleeve 7 below the stationary iron core 3. A balance hole 41 is provided on the moving iron core 4. A return spring 9 is provided between the moving iron core 4 and the stationary iron core 3. A connecting sleeve 8, fixedly connected to the sleeve 7, is provided below the magnetic conductor 1. A piston 6 is fixedly connected to the bottom of the connecting sleeve 8. A valve body 5 with the same inner diameter as the connecting sleeve 8, a piston 6 is set inside the connecting sleeve 8, a pilot hole 61 is provided on the piston 6, and a support tower spring 10 is provided between the piston 6 and the inner bottom surface of the valve body 5; when the coil 2 is energized, the stationary iron core 3 attracts the moving iron core 4 to move upward and thus compress the return spring 9. Under the action of the refrigerant and the pilot hole 61, the pressure below the piston 6 is greater than the pressure above, the piston 6 moves upward, and the valve port opens; when the coil 2 is de-energized, the moving iron core 4 loses its electromagnetic attraction. Under the action of the return spring 9 and the pilot hole 61, the pressure above the piston 6 is greater than the pressure below, the piston 6 moves downward, and the valve port closes.

[0039] As can be seen from the above structural design, a balance hole 41 is provided on the moving iron core 4. In the refrigerant environment, the pressure of the moving iron core 4 is balanced through the balance hole 41, which facilitates the coil 2 to be energized to attract the moving iron core 4 to move up and down flexibly. At the same time, a pilot hole 61 is provided on the piston 6. When the coil 2 is energized, it attracts the moving iron core 4 to compress the return spring 9. The refrigerant passes through the pilot hole 61, causing the pressure below the piston 6 to be greater than that above. The piston 6 moves upward and the valve port opens. The sensitivity is high and the valve opening performance can be greatly improved.

[0040] like Figure 7 As shown, piston 6 is precision machined from aluminum alloy. Piston 6 has two pilot holes 61: a first pilot hole 611 and a second pilot hole 612, corresponding to the piston 6's opening and closing mechanism. The first pilot hole 611 is located in the middle of piston 6, and the second pilot hole 612 is located to the side of the first pilot hole 611. Above the first pilot hole 611, at the bottom of the moving iron core 4, a moving iron core sealing gasket 42 is provided. When the moving iron core sealing gasket 42 is pressed against the first pilot hole 611, a seal is formed. To ensure stable movement of piston 6, a balance ring 62 is also provided on piston 6. The piston 6 is connected to the support spring 10 at the bottom and is assembled inside the connecting sleeve 8, allowing it to move up and down. A sealing gasket is present on the contact surface between piston 6 and the valve port, providing a sealing function.

[0041] like Figure 2 As shown, the diameter of the first pilot hole 611 is larger than the diameter of the second pilot hole 612, which can simultaneously meet the system's requirements for both low and high pressure.

[0042] As can be seen from the above structure, the function of the pilot hole 61 is as follows:

[0043] When the valve is closed, the refrigerant will form a balance between the piston 6 and the outside through the second pilot hole 612. When the valve is opened, the moving core iron moves upward, and the piston 6 will move upward under the action of the tower spring to open the valve port. When a large amount of refrigerant flows out, the refrigerant in the first pilot hole 611 will push the piston 6 to the top, achieving full opening.

[0044] When the valve is open, the coil 2 is de-energized, the moving iron core 4 moves down and seals with the pilot hole 61 of the piston 6. Under the action of the return spring 9 and the second pilot hole 612, the piston 6 is pushed to the large valve port, and the valve body 5 is closed.

[0045] like Figure 2 and Figure 5 As shown, the stationary iron core 3 is fixed to the magnetic conductor 1 by the external thread 31 and nut 32 on its top, pressing the magnetic conductor 1 and coil 2 together. The stationary iron core 3 is welded to the sleeve 7, the sleeve 7 is welded to the connecting sleeve 8, and the connecting sleeve 8 is welded to the valve body 5. In this way, a stable integral structure can be formed between the stationary iron core 3, the magnetic conductor 1, the coil 2, the sleeve 7, the connecting sleeve 8 and the valve body 5, so as to avoid the increase of impurities in the refrigerant system when the car is under severe vibration, and will not affect the normal operation of the thermal management system.

[0046] like Figure 2 and Figure 10 As shown, a filter screen 11 is fitted on the outside of the valve body 5 to ensure that impurities in the refrigerant cannot enter the valve body 5, thus ensuring the normal operation of the valve body 5.

[0047] like Figure 2 and Figure 6 As shown, the outer wall of the connecting sleeve 8 is provided with a connecting thread 81 and a connecting sleeve sealing ring 82, which serve to install and seal the module.

[0048] like Figure 3 and Figure 4 As shown, the top of the coil 2 has a protrusion 21, and the edge of the magnetic conductor 1 is provided with a bayonet 101 in different directions to form a limiting fit with the protrusion 21. Multiple installation positions are convenient for customers to install and use, and easy to choose.

[0049] like Figure 2 As shown, a valve port sealing ring 51 is provided on the outer wall of the valve body 5. The valve body 5 is directly welded to the connecting sleeve 8, which reduces the size and facilitates installation.

[0050] Based on the description and accompanying drawings of this invention, those skilled in the art can readily manufacture or use the automotive cartridge-type refrigerant solenoid valve structure of this invention, and can achieve the positive effects described in this invention.

[0051] Unless otherwise specified, in this invention, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this invention are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0052] Unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" in this invention 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A cartridge-type refrigerant solenoid valve structure for automobiles, comprising a magnetic conductor (1), a coil (2), a stationary iron core (3), a moving iron core (4), a valve body (5), and a piston (6), wherein the magnetic conductor (1) is fitted outside the coil (2), characterized in that: The stationary iron core (3) is fixedly connected to the magnetic conductor (1). A sleeve (7) fixedly connected to the stationary iron core (3) is provided in the middle of the coil (2). A moving iron core (4) is provided in the sleeve (7) below the stationary iron core (3). A reset spring (9) is provided between the moving iron core (4) and the stationary iron core (3). A connecting sleeve (8) fixedly connected to the sleeve (7) is provided below the magnetic conductor (1). A valve body (5) with the same inner diameter as the connecting sleeve (8) is fixedly connected to the bottom of the connecting sleeve (8). The piston (6) is provided inside the connecting sleeve (8). A pilot hole (61) is provided on the piston (6). A support tower spring (10) is provided between the piston (6) and the inner bottom surface of the valve body (5). When the coil (2) is energized, the stationary iron core (3) attracts the moving iron core (4) to move upward and compress the reset spring (9). Under the action of the refrigerant and the pilot hole (61), the pressure below the piston (6) is greater than that above, the piston (6) moves upward and the valve port opens. When the coil (2) is de-energized, the moving iron core (4) loses its electromagnetic attraction. Under the action of the reset spring (9) and the pilot hole (61), the pressure above the piston (6) is greater than that below, and the piston (6) moves downward, closing the valve port.

2. The automotive cartridge-type refrigerant solenoid valve structure according to claim 1, characterized in that: The pilot hole (61) includes a first pilot hole (611) and a second pilot hole (612). The first pilot hole (611) is located in the middle of the piston (6), and the second pilot hole (612) is located on the side of the first pilot hole (611). A moving iron core sealing gasket (42) is provided at the bottom of the moving iron core (4) above the first pilot hole (611).

3. The automotive cartridge-type refrigerant solenoid valve structure according to claim 2, characterized in that: The diameter of the first pilot hole (611) is larger than the diameter of the second pilot hole (612).

4. The automotive cartridge-type refrigerant solenoid valve structure according to claim 1, characterized in that: The moving iron core (4) is provided with a balance hole (41).

5. The automotive cartridge-type refrigerant solenoid valve structure according to claim 1, characterized in that: The stationary iron core (3) is fixed to the magnetic conductor (1) by the external thread (31) and nut (32) on its top.

6. The automotive cartridge-type refrigerant solenoid valve structure according to claim 1, characterized in that: The valve body (5) is fitted with a filter screen (11).

7. The automotive cartridge-type refrigerant solenoid valve structure according to claim 1, characterized in that: The outer wall of the connecting sleeve (8) is provided with a connecting thread (81) and a connecting sleeve sealing ring (82).

8. The automotive cartridge-type refrigerant solenoid valve structure according to claim 1, characterized in that: A valve port sealing ring (51) is provided on the outer wall of the valve body (5).

9. The automotive cartridge-type refrigerant solenoid valve structure according to claim 1, characterized in that: The top of the coil (2) has a protrusion (21), and the edge of the magnetic conductor (1) is provided with a bayonet (101) in different directions to form a limiting fit with the protrusion (21).

10. The automotive cartridge-type refrigerant solenoid valve structure according to claim 1, characterized in that: The piston (6) is provided with a balance ring (62).

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