CN114508594A

CN114508594A - Electromagnetic actuator and electromagnetic actuating system

Info

Publication number: CN114508594A
Application number: CN202210140253.3A
Authority: CN
Inventors: 吴东兴; 陈后涛; 张武凯; 杨振国; 袁宝良; 李晓娟
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2022-02-16
Filing date: 2022-02-16
Publication date: 2022-05-17
Anticipated expiration: 2042-02-16

Abstract

The invention discloses an electromagnetic actuator and an electromagnetic actuating system, belonging to the technical field of electromagnetic valves, wherein the electromagnetic actuator comprises a valve body, a valve seat and a valve core, wherein the valve body is provided with a mounting hole and a middle hole which are communicated, and the aperture of the mounting hole is larger than that of the middle hole; the valve seat is arranged in the mounting hole and is provided with a first through hole communicated with the middle hole; the valve core is movably arranged in the middle hole in a penetrating mode, and one end of the valve core can be tightly abutted against the valve seat and seal the first through hole; the valve body and/or the valve core are/is provided with a groove communicated with the first through hole, the depth direction of the groove is parallel to the extending direction of the valve body, and the groove is used for containing high-pressure fluid so that the high-pressure fluid extrudes the valve core to tightly abut against the valve body or extrudes the valve body to tightly abut against the valve core. The electromagnetic actuator and the electromagnetic actuating system provided by the invention have better sealing performance, and the leakage probability is reduced.

Description

Electromagnetic actuator and electromagnetic actuating system

Technical Field

The invention relates to the technical field of electromagnetic valves, in particular to an electromagnetic actuator and an electromagnetic execution system.

Background

With the development of digitalization and electrical appliance, various industries develop towards intellectualization, and the intellectualization needs a sensor to adopt signals and states and an actuator to realize a series of accurate operations. The solenoid valve is one of actuators, is mainly used for controlling the pressure and flow of liquid, and has remarkable advantages. Along with the gradual improvement of the precision of mechanical equipment, the pressure of the used medium is higher and higher, and the requirement on the control precision is higher and higher. However, in a high-pressure use environment, the leakage of the medium is increased remarkably, and the leakage not only causes the slow response and low precision of the solenoid valve, but also causes cavitation erosion or other problems of parts.

When the electromagnetic valve in the prior art is used, a valve body of the electromagnetic valve can be expanded outwards under the action of fluid pressure in an inner cavity, so that the gap between the valve body and a valve core of the electromagnetic valve is enlarged, the sealing performance of the electromagnetic valve is poor, and the leakage amount is large.

Disclosure of Invention

The invention aims to provide an electromagnetic actuator and an electromagnetic actuating system, which have better sealing performance and reduce the probability of leakage.

As the conception, the technical scheme adopted by the invention is as follows:

an electromagnetic actuator comprising:

the valve body is provided with a mounting hole and a middle hole which are communicated, and the aperture of the mounting hole is larger than that of the middle hole;

the valve seat is arranged in the mounting hole and is provided with a first through hole communicated with the middle hole;

the valve core is movably arranged in the middle hole in a penetrating mode, and one end of the valve core can be tightly abutted against the valve seat and seal the first through hole;

the valve body and/or the valve core are/is provided with a groove communicated with the first through hole, the depth direction of the groove is parallel to the extending direction of the valve body, and the groove is used for containing high-pressure fluid so that the high-pressure fluid extrudes the valve core to tightly abut against the valve body or extrudes the valve body to tightly abut against the valve core.

Optionally, the middle hole comprises a big hole section and a small hole section, and an interface is formed at the joint of the big hole section and the small hole section, and the interface is provided with the groove.

Optionally, the groove is disposed around the small hole section, and the groove, the large hole section, and the small hole section are coaxial.

Optionally, the groove is a rectangular ring groove or a stepped ring groove.

Optionally, a sidewall of the trench and the wall of the large hole section are located on the same plane.

Optionally, a gap exists between the bottom surface of the valve seat and the interface.

Optionally, the valve element comprises a large cylindrical section, a small cylindrical section and a conical section which are connected in sequence, the side wall of the large cylindrical section is in contact with the hole wall of the middle hole, the side wall of the small cylindrical section and the hole wall of the middle hole form a cavity, and the conical section can be tightly abutted to the valve seat and seal the first through hole.

Optionally, the end face of the large cylindrical section connected with the small cylindrical section is provided with the groove.

Optionally, the valve further comprises a cap, the cap is connected to an end of the large cylindrical section, which is not connected to the small cylindrical section, and the cap is used for providing a pressing force to the large cylindrical section so as to press the conical section against the valve seat.

Optionally, the valve core includes a first section, a second section and a third section which are connected in sequence, the outer side wall of the first section is in contact with the hole wall of the middle hole, a sealing body is arranged between the outer side wall of the second section and the hole wall of the middle hole, one end of the sealing body is abutted to the first section, the other end of the sealing body extends to the third section, and the groove is formed between the sealing body and the third section.

Optionally, the valve further comprises a fastener, the fastener is mounted at one end of the valve body and is used for fixing the valve seat at one end of the valve body, and the fastener is provided with a second through hole communicated with the first through hole.

Optionally, still include the overcoat, the overcoat has the mounting groove and locates the overcoat lateral wall and communicate respectively in the third through-hole and the fourth through-hole of mounting groove, the valve body set firmly in the mounting groove, just the valve body still have communicate in the fifth through-hole of fourth through-hole, the third through-hole communicate in first through-hole.

Optionally, the valve further comprises a sealing structure, and the sealing structure is arranged between the outer sleeve and the valve body.

An electromagnetic execution system comprises an oil pump, an electromagnetic valve and the electromagnetic actuator which are sequentially communicated.

The invention has at least the following beneficial effects:

according to the electromagnetic actuator and the electromagnetic actuating system provided by the invention, the groove is formed in the valve body, so that a medium can flow into the groove through the first through hole when entering the electromagnetic actuator, the medium flowing into the groove extrudes the groove wall of the groove, the thrust force for tightly fitting the valve body and the valve core is further provided, the acting force between the valve body and the valve core is enhanced, the self-sealing effect is realized, the higher the pressure of the medium is, the better the sealing effect is, the gap between the valve body and the valve core is reduced or kept unchanged, the better sealing property is realized, and the probability of leakage is reduced.

Drawings

FIG. 1 is a schematic cross-sectional view of an electromagnetic actuator according to an embodiment of the present invention;

fig. 2 is a first schematic structural diagram of a valve body according to a first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a valve body according to the first embodiment of the present invention

FIG. 4 is a reference diagram illustrating a usage status of an electromagnetic actuator according to an embodiment of the present invention;

FIG. 5 is an enlarged schematic view of the invention at A as shown in FIG. 4;

fig. 6 is a schematic cross-sectional view of an electromagnetic actuator according to a second embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of an electromagnetic actuator according to a third embodiment of the present invention;

fig. 8 is a schematic cross-sectional view of an electromagnetic actuator according to a fourth embodiment of the present invention;

fig. 9 is a schematic structural diagram of an electromagnetic execution system according to a fifth embodiment of the present invention.

In the figure:

1. a valve body; 11. mounting holes; 12. a mesopore; 121. a macroporous section; 122. a small pore section; 13. a trench; 14. a fifth through hole; 15. a second wall surface; 16. a first wall surface;

2. a valve seat; 21. a first through hole;

3. a valve core; 31. a large cylindrical section; 32. a small cylindrical section; 33. a tapered section; 34. a first stage; 35. a second stage; 36. a third stage;

4. capping;

5. a fastener; 51. a second through hole;

6. a jacket; 61. mounting grooves; 62. a third through hole; 63. a fourth via hole;

7. a sealing structure; 8. a seal body; 10. an oil pump; 20. an electromagnetic valve; 30. a high pressure oil pipe; 40. a pressure relief valve; 50. an oil tank; 100. a cavity.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

The embodiment provides an electromagnetic actuator, which can be applied to a high-pressure use environment, has good sealing performance and reduces the probability of leakage.

As shown in fig. 1, the electromagnetic actuator includes a valve body 1, a valve seat 2, and a valve body 3.

As shown in fig. 2, the valve body 1 has a mounting hole 11 and a middle hole 12 communicating with each other. The aperture of the mounting hole 11 is larger than the aperture of the middle hole 12, and the mounting hole 11 is used for mounting the valve seat 2, that is, the valve seat 2 is mounted in the mounting hole 11, in some embodiments, as shown in fig. 1, the cross section of the valve seat 2 is T-shaped, the bottom end of the valve seat 2 extends into the mounting hole 11, and the top end of the valve seat 2 is located outside the valve body 1 and is matched with the top end of the valve body 1. The valve seat 2 has a first through hole 21 communicating with the center hole 12 so that a medium of high pressure can enter the center hole 12 through the first through hole 21. The valve core 3 is movably disposed through the central hole 12, in this embodiment, the valve core 3 can move or rotate in the central hole 12, and one end of the valve core 3 can abut against the valve seat 2 and seal the first through hole 21, so that the electromagnetic actuator is in a closed state. When one end of the valve core 3 is not tightly pressed against the valve seat 2, the electromagnetic actuator is in an open state.

As shown in fig. 1 and 4, a groove 13 communicating with the first through hole 21 is formed in the valve body 1, a depth direction of the groove 13 is parallel to an extending direction of the valve body 1, and the groove 13 is used for accommodating high-pressure fluid so that the high-pressure fluid extrudes the valve body 1 to tightly abut against the valve core 3, and further, a gap between the valve body 1 and the valve core 3 can be reduced or kept unchanged, thereby reducing a risk of leakage.

The electromagnetic actuator that this embodiment provided sets up slot 13 on valve body 1 for can flow into slot 13 through first through-hole 21 when the medium gets into electromagnetic actuator in, the slot wall of slot 13 is extruded to the medium that flows into in the slot 13, and then provide the thrust that valve body 1 and case 3 closely laminated, the effort between valve body 1 and the case 3 has been strengthened, the effect of self-sealing has been realized, and the pressure of medium is higher, sealed effect is better, make the clearance between valve body 1 and the case 3 reduce or keep unchanged, have better leakproofness, the probability of leaking has been reduced.

In this embodiment, as shown in fig. 2, the middle hole 12 includes a large hole section 121 and a small hole section 122, the diameter of the large hole section 121 is larger than that of the small hole section 122, an interface is formed at the joint of the large hole section 121 and the small hole section 122, the interface is provided with the groove 13, so that the groove 13 is communicated with the large hole section 121, and the high-pressure medium in the first through hole 21 flows into the large hole section 121 first and then flows into the groove 13. It should be noted that, as shown in fig. 1, in order to facilitate the medium in the large hole section 121 to flow into the groove, a gap exists between the bottom surface of the valve seat 2 and the interface surface.

In this embodiment, in order to further improve the sealing effect, the groove 13 is disposed around the small hole section 122, that is, the groove 13 is an annular groove, so that a high-pressure medium in the groove 13 can be circumferentially extruded, and the valve element 3 and the valve body 1 can be better attached and sealed. Optionally, the groove 13, the large hole section 121 and the small hole section 122 are coaxial, i.e. the axes of the three are collinear.

In some embodiments, as shown in fig. 2, the groove 13 may be a rectangular ring groove, that is, the cross-sectional shape of the groove 13 is rectangular, or the groove sidewall of the groove 13 is a vertical plane. In other embodiments, as shown in fig. 3, the groove 13 is a stepped groove, that is, the cross-sectional shape of the groove 13 is stepped, or the groove sidewall of the groove 13 has a stepped structure, so that the groove 13 can accommodate more high-pressure fluid by providing the stepped structure. Wherein fig. 4 shows that the groove 13 has a stepped structure away from the groove side wall of the small hole section 122.

In this embodiment, referring to fig. 2, one side wall of the groove 13 and the hole wall of the large hole section 121 are located on the same plane, so that the area of the interface can be smaller, and further the hole diameter of the small hole section 122 can be larger, so that the valve core 3 can be thicker, and the probability of breaking the valve core 3 is reduced.

Alternatively, as shown in fig. 4, the spool 3 includes a large cylindrical section 31, a small cylindrical section 32, and a tapered section 33, which are connected in this order. Wherein the cross-sectional diameter of the large cylindrical section 31 is larger than the cross-sectional diameter of the small cylindrical section 32. The side wall of the large cylindrical section 31 is in contact and fit with the hole wall of the middle hole 12, the side wall of the small cylindrical section 32 is in contact and fit with the hole wall of the middle hole 12 to form a cavity 100, specifically, the side wall of the large cylindrical section 31 is in contact and fit with the hole wall of the large cylindrical section 121, the side wall of the small cylindrical section 32 and the hole wall of the large cylindrical section 121 form the cavity 100, media can be stored in the cavity 100, but the depth of the cavity 100 is smaller than that of the groove 13, so that the area of the groove 13 close to the first wall surface 16 of the cavity 100 is larger than that of the cavity 100 close to the second wall surface 15 of the groove 13, the resultant force applied to the side wall of the groove 13 is the force directed to the cavity 100 by the groove 13, the valve body 1 and the large cylindrical section 31 can be tightly fitted, and the leakage probability is reduced. The tapered section 33 can abut against the valve seat 2 and seal the first through hole 21. In some embodiments, the first through-hole 21 has a concave conical surface that mates with the conical section 33, and when the conical section 33 extends into the first through-hole 21, the convex conical surface of the conical section 33 mates with the concave conical surface to define the position of the spool 12. In fig. 4, three arrowed lines located above indicate the flow direction of the medium. In fig. 5, a straight line with an arrow indicates a force receiving direction of the valve body 1.

Further, as shown in fig. 1, the electromagnetic actuator further includes a cap 4, the cap 4 is connected to an end of the large cylindrical section 31, which is not connected to the small cylindrical section 32, that is, the cap 4 is connected to a bottom end of the valve element 3, and the cap 4 is used for providing a pressing force to the large cylindrical section 31 of the valve element 3, so that the conical section 33 is pressed against the valve seat 2. In this embodiment, the cap 4 is connected to another structure, for example, a peripheral member through a spring, and when the electromagnetic actuator is in a closed state, the cap 4 provides a supporting force to the valve element 3, so that the valve element 3 is supported against the valve seat 2 and blocks the first through hole 21. When the pressure of the high-pressure medium is greater than the abutting force provided by the cap 4, the valve core 3 moves away from the valve seat 2 under the action of the medium, and the first through hole 21 is further unblocked.

As shown in fig. 1, the electromagnetic actuator further includes a fastening member 5, the fastening member 5 is installed at one end of the valve body 1, and is used for fixing the valve seat 2 at one end of the valve body 1, in some embodiments, the fastening member 5 is screwed at one end of the valve body 1, and an accommodating space is formed between the fastening member 5 and the valve body 1, and the valve seat 2 is locked in the accommodating space by the fastening member 5 and the valve body 1. The fastening member 5 has a second through hole 51 communicating with the first through hole 21 so that a medium of high pressure can flow into the first through hole 21 through the second through hole 51.

Optionally, the electromagnetic actuator further comprises a casing 6. The outer sleeve 6 is provided with an installation groove 61, and a third through hole 62 and a fourth through hole 63 which are arranged on the side wall of the outer sleeve 6 and are respectively communicated with the installation groove 61. The valve body 1 is fixedly arranged in the mounting groove 61, the valve body 1 is further provided with a fifth through hole 14 communicated with the fourth through hole 63, and the third through hole 62 is communicated with the first through hole 21. The high-pressure medium flows into the mounting groove 61 through the third through hole 61, and sequentially enters the second through hole 51, the first through hole 21 and the large hole section 121, part of the medium flows into the groove 13, and part of the medium flows into the cavity 100.

Optionally, a sealing structure 7 is further arranged between the outer sleeve 6 and the valve body 1, and the sealing structure 7 is used for sealing a gap between the outer sleeve and the valve body.

The electromagnetic actuator provided by the embodiment has the following beneficial effects:

1. by adopting the sealing design scheme provided by the embodiment, the pressure of the medium can be effectively utilized to realize the self-sealing effect, and the higher the pressure of the medium is, the better the feedback effect on sealing is;

2. by adopting the sealing design scheme provided by the embodiment, a larger clearance fit value can be adopted, the manufacturing requirements on the valve body 1, the valve seat 2 and the valve core 3 are reduced, the tolerance can be enlarged, and the manufacturing cost can be obviously reduced;

3. by adopting the sealing design scheme provided by the embodiment, the application range of medium pressure can be expanded on the basis of original sealing, and the electromagnetic actuator can be used in higher-pressure occasions, so that the application range of the electromagnetic actuator is expanded;

4. by adopting the sealing design scheme provided by the embodiment, the risk of clamping stagnation of the valve core 3 can be reduced, the sealing performance is obviously improved, the matching precision is reduced, a larger matching gap can be adopted, and the problems that the valve body 1 and the valve core 3 expand due to temperature or pressure factors in the use process of the electromagnetic actuator, the valve core 3 is clamped after expansion, and the function of the electromagnetic actuator fails can be avoided;

5. by adopting the sealing design scheme provided by the embodiment, the sealing area can be shortened, the area of high-precision machining is reduced, the yield is improved, and the manufacturing cost is reduced;

6. adopt the sealed design scheme that this embodiment provided, because of self sealss effect, valve core 2 can be laminated after valve body 1 warp, and is insensitive to the oval structure of valve core 2, tolerance machining defect that can furthest.

Example two

The present embodiment provides an electromagnetic actuator that is different from the first embodiment in that the groove 13 of the present embodiment is provided on the spool 3.

Specifically, as shown in fig. 6, a groove 13 communicating with the first through hole 21 is formed in the valve element 3, a depth direction of the groove 13 is parallel to an extending direction of the valve body 1, and the groove 13 is used for accommodating high-pressure fluid, so that the high-pressure fluid extrudes the valve element 3 to abut against the valve body 1.

Further, the valve core 3 comprises a large cylindrical section 31, a small cylindrical section 32 and a conical section 33 which are connected in sequence, the end face of the large cylindrical section 31 connected with the small cylindrical section 32 is provided with a groove 13, and when a high-pressure medium flows into the groove 13, the groove wall of the groove 13 can be extruded to be close to the valve body 1, so that the high-pressure medium can be tightly attached to the valve body 1. When entering the electromagnetic actuator, the medium can flow into the groove 13 through the first through hole 21, and the medium flowing into the groove 13 extrudes the groove wall of the groove 13, so that the thrust force tightly attached to the valve body 1 and the valve core 3 is provided, the acting force between the valve body 1 and the valve core 3 is enhanced, the self-sealing effect is realized, the higher the pressure of the medium is, the better the sealing effect is, the gap between the valve body 1 and the valve core 3 is reduced or kept unchanged, the better sealing performance is realized, and the leakage probability is reduced.

Other structures in this embodiment are the same as those in the first embodiment and have the same beneficial effects, and are not described herein again.

EXAMPLE III

The present embodiment provides an electromagnetic actuator that is different from the embodiments in that: the valve body 1 and the valve core 3 in this embodiment are both provided with grooves 13.

Specifically, as shown in fig. 7, the valve element 3 includes a large cylindrical section 31, a small cylindrical section 32, and a tapered section 33 connected in sequence, a groove 13 is provided on an end surface of the large cylindrical section 31 connected to the small cylindrical section 32, and the middle hole 12 includes a large hole section 121 and a small hole section 122, a hole diameter of the large hole section 121 is larger than that of the small hole section 122, an interface is formed at an interface between the large hole section 121 and the small hole section 122, and the interface is provided with the groove 13. Through setting up two slots 13 for the cell walls of two slots 13 are close to each other and hug closely under the effect of medium pressure, have further improved the sealed effect between valve body 1 and the case 3, have reduced the probability of weeping.

Example four

The present embodiment differs from the first embodiment in that the groove 13 is formed by the valve element 3 and the seal body 8.

Specifically, as shown in fig. 8, the spool 3 includes a first section 34, a second section 35, and a third section 36 connected in this order. The first, second and

third sections

34, 35, 36 are successively of decreasing diameter, with the first, second and

third sections

34, 35, 36 being coaxial. The outer side wall of the first section 34 is in contact with the hole wall of the middle hole 12, a sealing body 8 is arranged between the outer side wall of the second section 35 and the hole wall of the middle hole 12, the sealing body 8 is cylindrical, one end of the sealing body 8 abuts against the first section 34, the other end of the sealing body extends to the third section 36, and in some embodiments, the end face of the other end of the sealing body 8 is flush with the end face of the third section 36, which is not connected with the second section 35. The sealing body 8 and the third section 36 form a trench 13 therebetween. When high-pressure medium is stored in the groove 13, the high-pressure medium extrudes the sealing body 8 to be tightly attached to the valve body 1, so that the gap between the sealing body 8 and the valve body 1 is reduced, and the probability of oil leakage is reduced.

EXAMPLE five

The present embodiment provides an electromagnetic actuator system, as shown in fig. 9, the electromagnetic actuator system includes an oil pump 10, an electromagnetic valve 20, and an electromagnetic actuator according to any one of the first to fourth embodiments, which are sequentially communicated. The electromagnetic execution system provided by the embodiment has higher reliability.

Alternatively, the oil pump 10, the solenoid valve 20 and the electromagnetic actuator are communicated through a high-pressure oil pipe 30, and the oil pump 10 and the electromagnetic actuator are respectively communicated with the oil tank 50 through the high-pressure oil pipe 30. The electromagnetic execution system further comprises a pressure relief valve 40, wherein one end of the pressure relief valve 40 is communicated between the oil pump 10 and the electromagnetic valve 20, and the other end of the pressure relief valve 40 is communicated with the oil tank 10 through the high-pressure oil pipe 30.

The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. An electromagnetic actuator, comprising:

the valve body (1), the valve body (1) has installation hole (11) and mesopore (12) that communicate, the aperture of the installation hole (11) is greater than the aperture of the mesopore (12);

a valve seat (2) mounted to the mounting hole (11), the valve seat (2) having a first through hole (21) communicating with the center hole (12);

the valve core (3) is movably arranged in the middle hole (12) in a penetrating mode, and one end of the valve core (3) can be abutted against the valve seat (2) and seals the first through hole (21);

the valve body (1) and/or the valve core (3) are/is provided with a groove (13) communicated with the first through hole (21), the depth direction of the groove (13) is parallel to the extending direction of the valve body (1), and the groove (13) is used for containing high-pressure fluid, so that the high-pressure fluid extrudes the valve core (3) to tightly abut against the valve body (1) or extrudes the valve body (1) to tightly abut against the valve core (3).

2. The electromagnetic actuator according to claim 1, characterized in that the central bore (12) comprises a large bore section (121) and a small bore section (122), the intersection of the large bore section (121) and the small bore section (122) forming an interface, the interface being provided with the groove (13).

3. The electromagnetic actuator according to claim 2, characterized in that the groove (13) is arranged around the small hole section (122), and the groove (13), the large hole section (121) and the small hole section (122) are coaxial.

4. The electromagnetic actuator according to claim 3, characterized in that the groove (13) is a rectangular or stepped ring groove.

5. The electromagnetic actuator according to claim 2, characterized in that a side wall of the groove (13) and a hole wall of the large hole section (121) are located on the same plane.

6. The electromagnetic actuator according to claim 2, characterized in that a gap exists between the bottom surface of the valve seat (2) and the interface.

7. The electromagnetic actuator according to any of claims 1 to 6, characterized in that the valve element (3) comprises a large cylindrical section (31), a small cylindrical section (32) and a conical section (33) which are connected in sequence, the side wall of the large cylindrical section (31) is in contact with the hole wall of the middle hole (12), the side wall of the small cylindrical section (32) and the hole wall of the middle hole (12) form a cavity (100), and the conical section (33) can abut against the valve seat (2) and seal the first through hole (21).

8. The electromagnetic actuator according to claim 7, characterized in that the end face of the large cylindrical section (31) connecting the small cylindrical section (32) is provided with the groove (13).

9. The electromagnetic actuator according to claim 7, characterized by further comprising a cap (4), wherein the cap (4) is connected to the end of the large cylindrical section (31) not connected to the small cylindrical section (32), and the cap (4) is used for providing a pressing force to the large cylindrical section (31) to press the conical section (33) against the valve seat (2).

10. The electromagnetic actuator according to any one of claims 1 to 6, characterized in that the valve core (3) comprises a first section (34), a second section (35) and a third section (36) which are connected in sequence, wherein the outer side wall of the first section (34) is in contact with the hole wall of the central hole (12), a sealing body (8) is arranged between the outer side wall of the second section (35) and the hole wall of the central hole (12), one end of the sealing body (8) abuts against the first section (34), the other end extends to the third section (36), and the groove (13) is formed between the sealing body (8) and the third section (36).

11. The electromagnetic actuator according to any of claims 1 to 6, characterized by further comprising a fastening member (5), the fastening member (5) being mounted to one end of the valve body (1) and being adapted to fix the valve seat (2) to one end of the valve body (1), the fastening member (5) having a second through hole (51) communicating with the first through hole (21).

12. The electromagnetic actuator according to any one of claims 1 to 6, characterized by further comprising an outer casing (6), wherein the outer casing (6) has a mounting groove (61) and a third through hole (62) and a fourth through hole (63) which are arranged on a side wall of the outer casing (6) and respectively communicated with the mounting groove (61), the valve body (1) is fixedly arranged in the mounting groove (61), the valve body (1) further has a fifth through hole (14) communicated with the fourth through hole (63), and the third through hole (62) is communicated with the first through hole (21).

13. The electromagnetic actuator according to claim 12, characterized by further comprising a sealing structure (7), the sealing structure (7) being provided between the outer sleeve (6) and the valve body (1).

14. An electromagnetic actuator system, characterized by comprising an oil pump (10), an electromagnetic valve (20) and the electromagnetic actuator according to any one of claims 1-13, which are communicated in sequence.