Solenoid valve

Abstract

The utility model relates to an electromagnetic valve which can prolong the service life of a sealing gasket. The electromagnetic valve comprises a valve sleeve; a piston capable of axially reciprocating relative to the valve sleeve; the movable valve element can do axial reciprocating motion relative to the valve sleeve, the movable valve element and the piston are sequentially arranged in the axial direction, the movable valve element is made of a metal material and comprises a tail portion contained in the valve sleeve, and the head portion of the movable valve element comprises a first containing cavity extending in the axial direction; the guide piece is contained in the first containing cavity, can do limited movement in the axial direction relative to the bottom of the first containing cavity and is in sliding contact with the movable valve element in the first containing cavity, and the guide piece is made of a metal material; the sealing gasket is fixed at the head part of the guide piece and can drive the piston along with the movement of the movable valve core; the buffering elastic piece is contained in the first containing cavity and arranged between the movable valve element and the tail of the guiding piece, and the buffering elastic piece is used for buffering impact between the sealing gasket and the piston.

Description

Technical Field

[0001] This utility model relates to an electromagnetic valve. Background Technology

[0002] Currently, a solenoid valve consists of a moving valve core, a gasket, and a piston. The moving valve core can perform axial reciprocating motion. The gasket is installed inside the head of the moving valve core and can move with the moving valve core. Simultaneously, the gasket can also contact the moving valve core within the head of the moving valve core and slide relative to it in a restricted manner; the gasket drives the piston. However, when the gasket slides between itself and the moving valve core, the sliding contact surface of the gasket is a rubber surface, while the sliding contact surface of the moving valve core is a metal surface. This will cause the gasket to be easily worn. Utility Model Content

[0003] One objective of this invention is to provide a solenoid valve that can improve the service life of the sealing gasket.

[0004] Therefore, this application provides a solenoid valve, including a valve sleeve, and a piston capable of axial reciprocating motion relative to the valve sleeve; a movable valve core capable of axial reciprocating motion relative to the valve sleeve and arranged sequentially with the piston along the axial direction, the movable valve core being made of a metal material, the movable valve core including a tail portion housed within the valve sleeve, and a head portion of the movable valve core including a first receiving cavity extending along the axial direction; a guide member housed in the first receiving cavity and capable of restricted axial movement relative to the bottom of the first receiving cavity and slidingly contacting the movable valve core within the first receiving cavity, the guide member being made of a metal material; a sealing gasket fixed to the head portion of the guide member and capable of driving the piston with the movement of the movable valve core; and a buffer elastic member housed in the first receiving cavity and disposed between the movable valve core and the tail portion of the guide member, the buffer elastic member being used to buffer the impact between the sealing gasket and the piston.

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

[0006] In some embodiments, the tail of the guide includes a second receiving cavity that extends axially and receives one end of a cushioning elastic member, the opening of the second receiving cavity facing the interior of the first receiving cavity.

[0007] In some embodiments, the head portion of the guide includes a third receiving cavity for receiving a sealing gasket with one end open. The sealing gasket is integrally formed with the guide by insert molding or overmolding within the third receiving cavity, and the sealing gasket faces the piston through the opening of the third receiving cavity.

[0008] In some embodiments, a guide and a sealing gasket are installed in the first receiving cavity and inserted axially into the moving valve core.

[0009] In some embodiments, the valve core is a one-piece piece made of stainless steel, the guide is a one-piece piece made of aluminum, and the sealing gasket is a one-piece piece made of plastic.

[0010] In some embodiments, the piston is a one-piece assembly made of aluminum.

[0011] In some embodiments, the sealing gasket has a flat pressing surface or a covered top surface on the axial end face facing the piston, the pressing surface or the covered top surface being used to hold the piston.

[0012] In some embodiments, the head portion of the guide includes a third receiving cavity for receiving a sealing gasket, and the guide has a flat connecting surface at the annular edge of the third receiving cavity, the connecting surface and the pressing surface or the covering top surface together forming a flat surface.

[0013] In some embodiments, the head of the moving valve core further includes an annular body formed by the annular edge of the moving valve core converging inward at the opening of the first receiving cavity, and the head of the guide further includes a shoulder formed on the outer peripheral wall, the annular body contacting the shoulder to define the sliding range of the guide relative to the first receiving cavity.

[0014] In some embodiments, the sealing gasket is a convex cylindrical structure.

[0015] In the solution provided by this utility model, the sealing gasket is fixedly installed on the guide, and the guide is installed inside the moving valve core. The sealing gasket can perform a limited axial reciprocating motion relative to the moving valve core, but it does not directly rub against the moving valve core. Instead, it achieves this by sliding contact between the guide, which is made of the same metal material as the moving valve core, and the moving valve core inside the moving valve core. This avoids damage to the sealing gasket and improves its service life. 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 2 Enlarged view of section A in the middle;

[0020] Figure 4 yes Figure 1 A three-dimensional schematic diagram of the moving valve core assembly of the solenoid valve shown.

[0021] Figure 5 yes Figure 4The diagram shows an exploded view of the moving valve core assembly. 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 1 The solenoid valve 100 includes a connector 13, a U-shaped bracket 15, and an electromagnetic assembly 20. The connector 13 is used to connect to an external power source to power the electromagnetic assembly 20. The two ends of the U-shaped bracket 15 are respectively mounted on the two shaft ends of the electromagnetic assembly 20.

[0024] refer to Figure 2 The electromagnetic component 20 is used to generate a magnetic field. 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 its center. The coil 23 is electrically connected to a terminal 14 installed inside the connector 13. In this embodiment, the coil 23 is electrically connected to the terminal 14 through a diode 13b of the connector 13, the diode 13b being used to prevent back electromotive force.

[0025] Reference Figures 2 to 5 The solenoid valve 100 also includes a valve sleeve 31, a piston 70 capable of axial reciprocating movement relative to the valve sleeve 31, and a movable valve core assembly 33 mounted on the valve sleeve 31 and used to drive the piston 70. The valve sleeve 31 is mounted in a through hole in the middle of the insulating wire frame 21. The valve sleeve 31 has openings at both axial ends. The tail of the movable valve core assembly 33 is received in one open end of the valve sleeve 31.

[0026] The moving valve core assembly 33 includes a moving valve core 34, a guide 44, a sealing gasket 54, and a cushioning elastic element 49. The moving valve core 34 is made of metal. In this embodiment, the moving valve core 34 is a one-piece integral piece made of stainless steel. The tail of the moving valve core 34 is housed within the valve sleeve 31. The moving valve core 34 is axially reciprocating relative to the valve sleeve 31 and is arranged sequentially with the piston 70 along the axial direction. The head of the moving valve core 34 includes a first receiving cavity 35 extending along the axial direction. The head of the moving valve core 34 also includes an annular body 37 formed by the annular edge of the moving valve core 34 converging inward at the opening of the first receiving cavity 35. The annular body 37 is used to contact the guide 44.

[0027] The guide 44 is made of a metallic material. In this embodiment, the guide 44 is a one-piece integral piece made of aluminum. The guide 44 is housed in the first receiving cavity 35 and can move axially in a restricted manner relative to the bottom of the first receiving cavity 35 to slide in contact with the valve core 34 within the first receiving cavity 35. In this embodiment, the head of the guide 44 contacts the ring 37, and the guide 44 can move axially in a restricted range between the bottom of the first receiving cavity 35 and the ring 37, such that the ring 37 defines the sliding range of the guide 44 relative to the bottom of the first receiving cavity 35. In this embodiment, the head of the guide 44 also includes a shoulder 48 formed on the outer peripheral wall, and the ring 37 contacts the shoulder 48 to define the sliding range of the guide 44 relative to the bottom of the first receiving cavity 35.

[0028] The tail portion of the guide 44 includes a second receiving cavity 45 extending axially, the opening of which faces the interior of the first receiving cavity 35. The second receiving cavity 45 is used to receive the cushioning elastic member 49. The head portion of the guide 44 includes a third receiving cavity 47 with one open end. The third sealing cavity 47 is used to receive a sealing gasket 54. The guide 44 has a flat connecting surface 46 at its annular edge in the third receiving cavity 47. The connecting surface 46 can cooperate with the sealing gasket 54 to drive the piston 70.

[0029] The sealing gasket 54 is a one-piece integral piece made of plastic. In this embodiment, the sealing gasket 54 is a one-piece integral piece made of hydrogenated nitrile butadiene rubber (HNBR). In this embodiment, the sealing gasket 54 has a convex cylindrical structure. The sealing gasket 54 is integrally formed with the guide 44 in the third receiving cavity 47 by insert molding or overmolding, and the sealing gasket 54 faces the piston 70 through the opening of the third receiving cavity 47. It is understood that the sealing gasket 54 can also be fixed in the third receiving cavity 47 by a screw connection, and this application does not limit this. The sealing gasket 54 is fixed to the head of the guide 44 and can drive the piston 70 with the movement of the moving valve core 34. In this embodiment, the guide 44 and the sealing gasket 54 are axially inserted into the first receiving cavity 35 of the moving valve core 34. The sealing gasket 54 has a flat pressing surface or covered top surface 57 on the axial end face facing the piston 70, and the pressing surface or covered top surface 57 is used to hold the piston 70. In this embodiment, the pressing surface or the top-covering surface 57 and the connecting surface 46 together form a flat surface. By using two planes that can jointly form a flat surface (i.e., the pressing surface or the top-covering surface 57 and the connecting surface 46), the stability and sealing performance of the moving valve core assembly 33 can be enhanced.

[0030] A buffer elastic element 49 is housed in the first receiving cavity 35 and disposed between the tail of the moving valve core 34 and the guide 44. The buffer elastic element 49 and the guide 44 are arranged sequentially along the axial direction. In this embodiment, one end of the buffer elastic element 49 is housed in the second receiving cavity 45, and the buffer elastic element 49 is disposed between the bottom of the first receiving cavity 35 and the bottom of the second receiving cavity 45. Through the buffer elastic element 49, the guide 44 can move axially relative to the bottom of the first receiving cavity 35. The buffer elastic element 49 is used to buffer the impact between the sealing gasket 54 and the piston 70. It is understood that the buffer elastic element 49 can be in a compressed state at all times, or it can be compressed only when the sealing gasket 54 drives the piston 70.

[0031] In this application, the sealing gasket 54 is fixed to the head of the guide member 44. The guide member 44 is installed inside the moving valve core 34 and can move in a restricted axial direction relative to the moving valve core 34. Both the guide member 44 and the moving valve core 34 are made of metal material, so that the sealing gasket 54 can move in a restricted axial direction relative to the moving valve core 34 without directly rubbing against the moving valve core 34. Instead, it is achieved by the guide member 44, which is also made of metal material, sliding in contact with the moving valve core 34 inside the moving valve core 34, thus avoiding damage to the sealing gasket 54 and improving the service life of the sealing gasket 54.

[0032] In this embodiment, the solenoid valve 100 further includes a stationary iron core 32 and a first elastic element 39 with both ends disposed between the stationary valve core 32 and the moving valve core 34, which provides a restoring force to the moving valve core 34 when the solenoid valve 100 is not energized. The stationary iron core 32, the first elastic element 39, the moving valve core 34, and the piston 70 are arranged sequentially along the axial direction. In this embodiment, the head of the stationary iron core 32 is fixed in the other open end of the valve sleeve 31. One end of the first elastic element 39 is received in the tail of the moving iron core 34. In this embodiment, the tail of the moving iron core 34 includes an axially extending elastic element receiving cavity 38, and one end of the first elastic element 39 is received in the elastic element receiving cavity 38.

[0033] In this embodiment, in conjunction with the reference Figure 2 and Figure 3 The solenoid valve 100 also includes a valve cover 16, a valve body 12, and a second elastic element 79. The head of a valve sleeve 31 is fixed inside 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.

[0034] The valve body 12 includes a flow channel 93. In this embodiment, the flow channel 93 extends axially through the valve body 12. A piston 70 is housed within the valve body 12, and the piston 70 can reciprocate axially within the valve body 12. In this embodiment, 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 within the valve body 12 is driven by the valve core 34 to move between an open valve position and a closed valve position, so that the solenoid valve 100 is in an open valve state or a closed valve state. In this embodiment, the piston 70 includes a sealing element 81, which is used to block the flow channel 93. It is understood that when the sealing element 81 blocks the flow channel 93, the piston 70 is in the blocked position; when the sealing element 81 opens the flow channel 93, the piston 70 is in the open valve position. A second elastic element 79 extends axially and is housed within the valve body 12. The two opposite ends of the second elastic element 79 abut against the valve body 12 and the piston 70 respectively, so as to apply elastic force to the piston 70 to reset the piston 70 when energized, and keep the piston 70 in contact with the sealing gasket 54 when the solenoid valve 100 is not energized.

[0035] The opening and closing functions of solenoid valve 100 are described in detail below:

[0036] When the solenoid valve 100 is energized, the moving valve core 34 moves toward the stationary iron core 32. The ring body 37 presses against the guide 44, driving the guide 44 to move the sealing gasket 54 toward the stationary iron core 32 until the moving valve core 34 presses against the stationary iron core 32, causing the sealing gasket 54 to separate from the piston 70. Under the action of the second elastic element 79, the piston 70 also moves toward the stationary iron core 32 until the piston 70 returns to its original position. At this time, the seal 81 of the piston 70 opens the flow channel 93, the piston 70 is in the open position, and the solenoid valve 100 is in the open state. It can be understood that if the distance the sealing gasket 54 moves toward the stationary iron core 32 is greater than the return distance of the piston 70, the sealing gasket 54 will separate from the piston 70.

[0037] 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, causing the guide 44 to also move axially away from the stationary iron core 32, so that the sealing gasket 54 fixed in the head of the guide 44 abuts against the piston 70. As the moving valve core 34 continues to move away from the stationary iron core 32, the sealing gasket 54 drives the piston 70 to compress the second elastic element 79 in the direction away from the stationary iron core 32. Since the buffer elastic element 49 is located between the moving valve core 34 and the tail of the guide 44, there is an interaction force between the sealing gasket 54 and the piston 70. When the sealing gasket 54 drives the piston 70 to move, the piston 70 also drives the guide 44, on which the sealing gasket 54 is fixed, to compress the buffer elastic element 49. This allows the sealing gasket 54 to move axially within a limited range relative to the moving valve core 34, but it does not directly rub against the moving valve core 34. Instead, it slides in contact with the moving valve core 34 through the guide 44 until the guide 44 abuts against the bottom of the first receiving cavity 35. Then, as the moving valve core 34 continues to move under the action of the first elastic element 39, the sealing gasket 54 drives the piston 70 to continue moving in a direction away from the stationary iron core 32, compressing the second elastic element 79 until the sealing element 81 of the piston 70 blocks the flow channel 93. At this time, the moving valve core 34 resets, and the piston 70 is in the blocked position, and the solenoid valve 100 is in the closed state.

[0038] It is understood that during the entire process of the seal 54 driving the piston 70 to move, there may always be an interaction force between the seal 54 and the piston 70, and this application does not limit this.

[0039] 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 buffer elastic element 49 through the sealing gasket 54, temporarily separating the sealing gasket 54 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. The sealing gasket 54 has a flat pressing surface or a covered top surface 57 on its axial end face facing the piston 70, and the pressing surface or covered top surface 57 and the connecting surface 46 of the guide 44 together form a flat surface. When the piston 70 is driven by the pressing surface or the top surface covered by the cover 57 and the balance channel 76 is closed, the flat pressing surface or the top surface covered by the cover 57 is beneficial to sealing the balance channel 76. At the same time, the pressing surface or the top surface covered by the cover 57 and the connecting surface 46 of the guide 44 together form a flat surface, which can avoid the deformation of the sealing gasket 54, improve the stability and sealing performance of the solenoid valve 100, and also prevent the sealing gasket 54 from embedding into the piston 70 when sealing the balance channel 76.

[0040] 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 sleeve (31), characterized in that, The solenoid valve also includes: A piston (70) capable of axial reciprocating motion relative to the valve sleeve (31); A movable valve core (34) capable of axial reciprocating relative to the valve sleeve (31) and arranged sequentially with the piston (70) along the axial direction, the movable valve core (34) being made of metal material, the movable valve core (34) including a tail portion housed within the valve sleeve (31), and the head portion of the movable valve core (34) including a first receiving cavity (35) extending along the axial direction. A guide (44) is housed in the first receiving cavity (35) and is able to move axially in a restricted manner relative to the bottom of the first receiving cavity (35) and slide in contact with the moving valve core (34) in the first receiving cavity (35), the guide (44) being made of a metal material; A sealing gasket (54) fixed to the head of the guide (44) and capable of driving the piston (70) with the movement of the moving valve core (34); and A buffer elastic element (49) is housed in the first receiving cavity (35) and disposed between the tail of the moving valve core (34) and the guide (44), the buffer elastic element (49) being used to buffer the impact between the sealing gasket (54) and the piston (70).

2. The solenoid valve as described in claim 1, characterized in that, The tail of the guide (44) includes a second receiving cavity (45) that extends axially and receives one end of the buffer elastic member (49), the opening of the second receiving cavity (45) facing the interior of the first receiving cavity (35).

3. The solenoid valve as described in claim 1, characterized in that, The head of the guide (44) includes a third receiving cavity (47) for receiving the sealing gasket (54) with one end open. The sealing gasket (54) is integrally formed with the guide (44) by insert molding or overmolding in the third receiving cavity (47). The sealing gasket (54) faces the piston (70) through the opening of the third receiving cavity (47).

4. The solenoid valve as described in claim 1, characterized in that, The guide (44) and the sealing gasket (54) are installed in the first receiving cavity (35) and are inserted axially into the moving valve core (34).

5. The solenoid valve as described in claim 1, characterized in that, The moving valve core (34) is a one-piece piece made of stainless steel, the guide (44) is a one-piece piece made of aluminum, and the sealing gasket (54) is a one-piece piece made of plastic.

6. The solenoid valve as described in claim 1, characterized in that, The piston (70) is a one-piece unit made of aluminum.

7. The solenoid valve as described in claim 1, characterized in that, The sealing gasket (54) has a flat pressing surface or a covered top surface (57) on the axial end face facing the piston (70), which is used to abut the piston (70).

8. The solenoid valve as described in claim 7, characterized in that, The head of the guide (44) includes a third receiving cavity (47) for receiving the sealing gasket (54), and the guide (44) has a flat connecting surface (46) at the annular edge of the third receiving cavity (47), the connecting surface (46) together with the pressing surface or the covering top surface (57) to form a flat surface.

9. The solenoid valve as described in claim 1, characterized in that, The head of the moving valve core (34) also includes an annular body (37) formed by the annular edge of the moving valve core (34) converging inward at the opening of the first receiving cavity (35), and the head of the guide (44) also includes a shoulder (48) formed on the outer peripheral wall, the annular body (37) contacting the shoulder (48) to define the sliding range of the guide (44) relative to the first receiving cavity (35).

10. The solenoid valve as claimed in claim 1, characterized in that, The sealing gasket (54) has a convex column structure.

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