Solenoid valve and automobile thermal management system comprising same

Abstract

The utility model relates to an electromagnetic valve and an automobile thermal management system comprising the electromagnetic valve. A sealing piece can be prevented from falling off from a piston. The electromagnetic valve comprises a valve body, and the valve body comprises a flow channel. The piston can generate local deformation, and a sealing piece containing cavity is formed in the axial end of the piston; the movable valve element assembly can do axial reciprocating motion and drive the piston to move; the sealing piece is installed in the sealing piece containing cavity and can block or open the flow channel along with the movement of the piston, and the peripheral wall of the sealing piece is concaved inwards to form an annular groove for containing the deformation of the piston when the piston deforms locally so as to absorb the acting force which is applied to the sealing piece by the deformation of the piston and enables the sealing piece to deform.

Description

Technical Field

[0001] This utility model relates to a solenoid valve and an automotive thermal management system including the solenoid valve. Background Technology

[0002] Currently, solenoid valves typically consist of a valve body, a piston, and a seal. The valve body includes a flow channel, and the piston is driven to move the seal to block or open the flow channel, thus opening or closing the solenoid valve. However, because the piston and seal are made of materials with different coefficients of thermal expansion, the piston can undergo localized deformation. This can easily create a gap between the seal and the piston, causing the seal to detach from the piston, which can lead to solenoid valve malfunction. Utility Model Content

[0003] One objective of this invention is to provide a solenoid valve and an automotive thermal management system including the solenoid valve, which can prevent the seal from falling off the piston.

[0004] In a first aspect, one embodiment of this application provides an electromagnetic valve, including a valve body, the valve body including a flow channel, the electromagnetic valve further including: a piston capable of producing local deformation, the axial end of the piston forming a sealing element receiving cavity; a moving valve core assembly capable of axially repetitive movement and driving the piston to move; a sealing element installed in the sealing element receiving cavity and capable of blocking or opening the flow channel as the piston moves, the outer peripheral wall of the sealing element being recessed inward to form an annular groove that accommodates the deformation of the piston when the piston is locally deformed, so as to absorb the force exerted on the sealing element by the deformation of the piston, causing the sealing element to deform.

[0005] The solenoid valve may exhibit one or more of the following features, either individually or in combination.

[0006] In some embodiments, the piston further includes an outer peripheral wall defining a sealing cavity, the outer peripheral wall including an inner protrusion that projects radially inward and is received in an annular groove.

[0007] In some embodiments, the inner protrusion is a localized protrusion along the circumferential direction.

[0008] In some embodiments, there are multiple inner protrusions, which are distributed at intervals in the circumferential direction.

[0009] In some embodiments, the inner protrusion is formed by a radially inward bending of the outer peripheral wall of the piston.

[0010] In some embodiments, both the sealing cavity and the sealing element are annular structures, such that the piston also includes a central protrusion that is radially spaced from the outer peripheral wall of the piston and located radially inside the outer peripheral wall of the piston, which together with the inner protrusion limits the sealing element.

[0011] In some embodiments, the central protrusion is an axially arranged hollow cylindrical structure located at the center of the sealing cavity.

[0012] In some embodiments, the piston is made of metal and the seal is made of plastic.

[0013] In some embodiments, a seal is installed in the seal receiving cavity and integrally fixed to the piston along the axial direction.

[0014] Secondly, one embodiment of this application provides an automotive thermal management system, which includes a solenoid valve as described in any of the possible embodiments of the first aspect above.

[0015] The present invention relates to an electromagnetic valve and an automotive thermal management system including the electromagnetic valve. The piston can undergo local deformation, and the outer peripheral wall of the seal is recessed inward to form an annular groove that accommodates the deformation of the piston when the piston undergoes local deformation. This groove absorbs the force exerted on the seal by the piston deformation, thus maintaining the integrity of the seal and preventing damage to it. At the same time, it reduces the gap between the seal and the piston due to piston deformation, preventing the seal from falling off the piston. Attached Figure Description

[0016] To further reveal the specific technical content of this case, please first refer to the accompanying drawings, in which:

[0017] Figure 1 This is a three-dimensional schematic diagram of the solenoid valve provided in an embodiment of the present utility model;

[0018] Figure 2 yes Figure 1 A cross-sectional view of the solenoid valve in the de-energized state.

[0019] Figure 3 yes Figure 1 A three-dimensional schematic diagram of the piston and seals used in the solenoid valve shown at one angle.

[0020] Figure 4 yes Figure 3 A three-dimensional schematic diagram of the piston and seal shown from another angle;

[0021] Figure 5 yes Figure 4 The diagram shows an exploded view of the piston and seals. Detailed Implementation

[0022] The technical solutions in the embodiments of this utility model will now be described with reference to the accompanying drawings.

[0023] refer to Figure 1An embodiment of the present invention provides a solenoid valve 100 including a connector 13, a U-shaped bracket 15, and an electromagnetic component 20. The connector 13 is used to connect to an external power source to supply power to the electromagnetic component 20. The U-shaped bracket 15 is mounted on both shaft ends of the electromagnetic component 20. The electromagnetic component 20 is used to generate a magnetic field.

[0024] refer to Figure 2 The electromagnetic component 20 includes an insulated wire frame 21, a coil 23 disposed on the insulated wire frame 21, and a protective shell 11 covering the outer periphery of the insulated wire frame 21 and the coil 23 and fixedly connected to the connector 13. The insulated wire frame 21 has a through hole in the middle. The coil 23 is electrically connected to a terminal 14 installed in the connector 13. In this embodiment, the coil 23 is electrically connected to the terminal 14 through a diode 13b, which is used to prevent back electromotive force.

[0025] The solenoid valve 100 also includes a valve sleeve 31, a stationary iron core 32, and a moving valve core assembly capable of axial reciprocating motion within the valve sleeve 31. The valve sleeve 31 is installed in the through hole in the middle of the insulating wire frame 21. The valve sleeve 31 has openings at both axial ends. The tail end of the stationary iron core 32 and the head end of the moving valve core assembly are respectively housed within the two open ends of the valve sleeve 31. Specifically, the tail end of the stationary iron core 32 is fixed within the open end of the valve sleeve 31. In this embodiment, the tail end of the stationary iron core 32 can be welded and fixed within the open end of the tail end of the valve sleeve 31.

[0026] The moving valve core assembly is used to drive the movement of a driven component (e.g., a piston). The moving valve core assembly includes a moving valve core 34 mounted within a valve sleeve 31 and capable of axial reciprocating within the valve sleeve 31; a first elastic element 39 disposed at both ends between a stationary valve core 32 and a moving iron core 34, providing a reset force to the moving valve core 34 when the solenoid valve is not energized; and a sealing gasket 54 directly or indirectly mounted to the moving valve core 34. The stationary iron core 32, the first elastic element 39, and the moving valve core 34 are arranged sequentially along the axial direction. In this embodiment, the head and tail portions of the moving valve core 34 respectively include a sealing gasket receiving cavity 35 and an elastic element receiving cavity 38, with the sealing gasket 54 slidably received within the sealing gasket receiving cavity 35. In this embodiment, the sealing gasket 54 can move within a limited range along the axial direction relative to the bottom of the sealing gasket receiving cavity 35. The moving valve core assembly also includes a second elastic element 49 received in the sealing gasket receiving cavity 35 and disposed between the moving valve core 34 and the sealing gasket 54. In this embodiment, the second elastic element 49 is a buffer spring, used to buffer the impact between the sealing gasket 54 and the driven component (e.g., piston) when the sealing gasket 54 moves axially.

[0027] The elastic element receiving cavity 38 houses one end of the first elastic element 39. The moving valve core 34 also includes an axial through hole 36, the two ends of which are respectively connected to the sealing gasket receiving cavity 35 and the elastic element receiving cavity 38.

[0028] Reference Figures 2 to 5In this embodiment, the solenoid valve 100 further includes a valve cover 16 fixed to the head of the valve sleeve 31 and a valve body 12 fixed to the valve cover 16. In this embodiment, the head of the valve sleeve 31 is fixed to the valve cover 16 by welding or other methods. The valve cover 16 is installed inside the valve body 12. In this embodiment, the valve cover 16 is fixed to the valve body 12 by a threaded connection. The valve body 12 includes a flow channel 93. In this embodiment, the flow channel 93 extends axially through the valve body 12.

[0029] The solenoid valve 100 also includes a piston 70 that can reciprocate axially in the valve body 12, and a seal 81 mounted on the piston 70.

[0030] In this embodiment, the piston 70 is made of a metallic material. A dynamic O-ring 66 is provided between the piston 70 and the valve body 12, and the dynamic O-ring 66 is used to achieve a seal between the piston 70 and the valve body 12. The piston 70 can undergo local deformation. In this embodiment, the seal 81 and the piston 70 are made of materials with different coefficients of thermal expansion, causing the piston 70 to undergo local deformation. In this embodiment, the axial end of the piston 70 includes a seal receiving cavity 73. The piston 70 also includes an outer peripheral wall 77 defining the seal receiving cavity 73.

[0031] The outer peripheral wall 77 includes a radially inwardly projecting inner protrusion 78 that protrudes toward the seal 81 to prevent the seal 81 from disengaging from the seal receiving cavity 73. In this embodiment, the inner protrusion 78 is a partial, inwardly projecting portion along the circumferential direction, i.e., the portion of the inner protrusion 78 formed on the outer peripheral wall 77. There are multiple inner protrusions 78, spaced apart circumferentially. The inner protrusion 78 is formed by radially inward bending of the outer peripheral wall 77 of the piston 70. In this embodiment, the inner protrusion 78 is formed by stamping the outer peripheral wall 77 from the outside in.

[0032] In this embodiment, the sealing cavity 73 is an annular structure, such that the piston 70 also includes a central protrusion 75 that is radially spaced from and located radially inside the outer peripheral wall 77 of the piston 70. In this embodiment, the central protrusion 75 is an axially arranged hollow cylindrical structure located at the center of the sealing cavity 73.

[0033] The seal 81 is made of plastic material. In this embodiment, the seal 81 is made of polytetrafluoroethylene (PTFE). The seal 81 is installed in the seal receiving cavity 73 and can block or open the flow channel 93 as the piston 70 moves, so that the solenoid valve 100 is in the open or closed state. In this embodiment, when the solenoid valve 100 is not energized, the seal 81 blocks the flow channel 93, and the solenoid valve 100 is in the closed state; when the solenoid valve 100 is energized, the seal 81 opens the flow channel 93, and the solenoid valve 100 is in the open state. The outer peripheral wall of the seal 81 is recessed inward to form an annular groove 83 that accommodates the deformation of the piston 70 when the piston 70 is partially deformed, so as to absorb the force exerted on the seal 81 by the deformation of the piston 70, causing the seal 81 to deform. Thus, the integrity of the seal 81 can be maintained, avoiding damage to the seal 81, while the gap between the seal 81 and the piston 70 due to the deformation of the piston 70 can be reduced, preventing the seal 81 from falling off the piston 70.

[0034] In this embodiment, the seal 81 is integrally fixed to the seal receiving cavity 73 of the piston 70 by being pressed axially. In this way, the seal 81 can be firmly fixed in the piston 70.

[0035] In this embodiment, the annular groove 83 also accommodates an inner protrusion 78. This allows the seal 81 to be more securely fixed to the piston 70, preventing it from detaching. Simultaneously, since the inner protrusion 78 is a localized inward protrusion along the circumferential direction, the annular groove 83, in addition to partially accommodating the inner protrusion 78, also provides some space to accommodate deformation of the piston 70.

[0036] In this embodiment, the seal 81 has an annular structure. The seal 81 is radially compressed from opposite sides by the central protrusion 75 and the inner protrusion 78, making the connection between the seal 81 and the piston 70 within the seal receiving cavity 73 more secure; that is, the central protrusion 75 and the inner protrusion 78 jointly limit the seal 81. Even if the outer peripheral wall 77 of the seal 81 and the piston 70 is made of materials with different coefficients of thermal expansion, causing local deformation of the piston 70, the central protrusion 75 and the inner protrusion 78 can prevent the seal 81 from detaching from the seal receiving cavity 73.

[0037] In this embodiment, the solenoid valve may further include a third elastic element 79. The third elastic element 79 extends axially and is housed within the valve body 12. The opposite ends of the third elastic element 79 abut against the piston 70 and the valve body 12, respectively, to apply a spring force to the piston 70 so that the piston 70 resets when energized, and to maintain contact between the piston 70 and the sealing gasket 54 when the solenoid valve is not energized. The opening and closing of the solenoid valve 100 are described in detail below:

[0038] When the solenoid valve 100 is energized, the moving valve core 34 moves toward the stationary iron core 32, causing the sealing gasket 54 to also move toward the stationary iron core 32. Under the action of the third elastic element 79, the piston 70 also moves in the same direction as the sealing gasket 54, and causes the sealing element 81 to open the flow channel 93. At this time, the solenoid valve 100 is in the open state.

[0039] When the solenoid valve 100 is de-energized, under the action of the first elastic element 39, the moving valve core 34 moves axially away from the stationary iron core 32, which drives the sealing gasket 54 to also move axially away from the stationary iron core 32. This causes the sealing gasket 54 to abut against the piston 70 and push the piston 70 to drive the sealing element 81 to move in the same direction as the sealing gasket 54, until the sealing element 81 blocks the flow channel 93. At this time, the solenoid valve 100 is in the closed state.

[0040] In this application, the piston 70 can undergo local deformation, and the annular groove 83 of the seal 81 can accommodate the deformation of the piston 70, thereby preventing the deformation of the piston 70 from exerting a force on the seal 81, maintaining the integrity of the seal 81, avoiding damage to the seal 81, and reducing the gap between the seal 81 and the piston 70 due to the deformation of the piston 70, thus preventing the seal 81 from falling off the piston 70.

[0041] The piston 70 includes a balance channel 76 extending axially through the piston 70. The piston 70 can be pressed against the balance channel 76 by the sealing gasket 54. When the flow channel 93 is closed by the seal 81, if the liquid pressure in the flow channel 93 is too high, the liquid can impact the sealing gasket 54 through the balance channel 76, compressing the second elastic element 49 through the sealing gasket 54, causing the sealing gasket 54 to temporarily separate from the piston 70, allowing the liquid to enter the balance chamber 72 between the moving valve core 34 and the piston 70. In this way, both ends of the piston 70 are subjected to liquid pressure, thereby balancing the piston 70 and maintaining the pressurization with the sealing gasket 54.

[0042] In addition, this utility model also provides an automotive thermal management system, which includes the solenoid valve described in the above embodiment.

[0043] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A solenoid valve, comprising a valve body (12), said valve body (12) including a flow channel (93), characterized in that, The solenoid valve also includes: A piston (70) capable of producing local deformation, wherein a sealing cavity (73) is formed at the axial end of the piston (70). A moving valve core assembly capable of axial repetitive motion and driving piston (70) motion; A seal (81) is installed in the sealing cavity (73) and can block or open the flow channel (93) as the piston (70) moves. The outer peripheral wall of the seal (81) is formed by an inwardly recessed annular groove (83) that accommodates the deformation of the piston (70) when the piston (70) is partially deformed, so as to absorb the force exerted on the seal (81) by the deformation of the piston (70) to cause the seal (81) to deform.

2. The solenoid valve as described in claim 1, characterized in that, The piston (70) also includes an outer peripheral wall (77) defining the sealing cavity (73), the outer peripheral wall (77) including an inner protrusion (78) that protrudes radially inward and is received in the annular groove (83).

3. The solenoid valve as described in claim 2, characterized in that, The inner convex portion (78) is a local protrusion along the circumferential direction.

4. The solenoid valve as described in claim 2, characterized in that, The number of the inner protrusions (78) is multiple, and the multiple inner protrusions (78) are distributed at intervals in the circumferential direction.

5. The solenoid valve as described in claim 2, characterized in that, The inner protrusion (78) is formed by the radial inward bending of the outer peripheral wall of the piston (70).

6. The solenoid valve as described in claim 2, characterized in that, Both the sealing cavity (73) and the sealing element (81) are annular structures, such that the piston (70) also includes a central protrusion (75) that is radially spaced from the outer peripheral wall of the piston (70) and located radially inside the outer peripheral wall of the piston (70), which together with the inner protrusion (78) limits the sealing element (81).

7. The solenoid valve as described in claim 6, characterized in that, The central protrusion (75) is an axially arranged hollow cylindrical structure located at the center of the sealing cavity (73).

8. The solenoid valve as described in claim 1, characterized in that, The piston (70) is made of metal and the seal (81) is made of plastic.

9. The solenoid valve as described in claim 1, characterized in that, The seal (81), which is integrally fixed to the piston (70) by being pressed into the seal receiving cavity (73) along the axial direction, is installed in the seal receiving cavity (73).

10. An automotive thermal management system, characterized in that, The automotive thermal management system includes a solenoid valve as described in any one of claims 1 to 9.

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