A proportional solenoid

Abstract

The utility model discloses a proportional electromagnet belongs to hydraulic technology field. The proportional electromagnet includes shell, plug assembly, coil assembly, tail, armature assembly and pilot assembly. The shell includes shell body and front yoke, and the front yoke has the through hole and the oil return hole of intercommunication. The tail is set in the shell body, and is opposite to the front yoke. Coil assembly is set in the shell body and is ringed in the front yoke and the tail. Plug assembly is electrically connected with coil assembly, and plug assembly has the plug interface, and the axial direction of plug interface is perpendicular to the axial direction of shell body. The pilot assembly includes pilot valve seat and plugging piece, and the pilot valve seat is connected to the front yoke, and the pilot valve seat has the oil inlet channel, and the plugging piece is movably arranged in the oil inlet channel, and the armature assembly can move relative to the tail when the coil assembly is electrified, and drives the plugging piece to move to cut off the passageway between the oil inlet channel and the oil return hole. The proportional electromagnet can be suitable for the working condition with smaller installation space.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology, specifically to a proportional electromagnet. Background Technology

[0002] Proportional electromagnets are an important component of proportional valves. Under the action of proportional electromagnets, proportional valves can achieve proportional control of parameters such as pressure and flow rate in hydraulic systems. Proportional control is achieved by changing the current value passed through the coil inside the proportional electromagnet through the controller to control the movement distance or force value of the valve core of the proportional valve, thereby changing the opening amount or pressure of the proportional valve orifice.

[0003] A proportional electromagnet typically includes a housing, a front yoke, a tail yoke, a coil assembly, an armature, and a push rod. When current flows through the coil assembly, a toroidal magnetic field is generated along the housing, front yoke, and tail yoke. Under the influence of this toroidal magnetic field, the armature moves axially, simultaneously driving the push rod connected to the armature to move synchronously. This causes the push rod to extend out of the housing and trigger the switch of an external actuator. Proportional electromagnets in related technologies often suffer from the following problems: the axis of the plug assembly used to power the coil assembly is usually collinear with the axis of the housing. During use, the proportional electromagnet needs to be plugged into an external power source along the axial direction of the housing to achieve electrical connection. This results in a large installation space being required in the axial direction of the housing, making it unsuitable for applications with limited installation space.

[0004] Therefore, there is an urgent need for a proportional electromagnet to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a proportional electromagnet in which the axial direction of the plug assembly's interface is perpendicular to the axial direction of the housing, making it suitable for applications with limited installation space.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A proportional electromagnet, comprising:

[0008] The outer shell includes a shell body and a front yoke. The shell body has a first end opening and a second end opening that are disposed opposite to each other. The front yoke is connected to the second end opening. The front yoke has a through hole inside. The side wall of the front yoke is provided with an oil return hole that communicates with the through hole.

[0009] The tail yoke is disposed in the shell body and is positioned opposite to the first end of the front yoke;

[0010] A coil assembly is disposed within the shell body and surrounds the front yoke and the tail yoke;

[0011] A plug assembly is sealed to the first end opening and electrically connected to the coil assembly. The plug assembly has a plug interface, and the axis of the plug interface is perpendicular to the axis of the housing body. An electrical connector for connecting to an external power source is provided in the plug interface.

[0012] An armature assembly, one end of which is movably inserted into the tailstock and the other end of which is movably inserted into the through hole;

[0013] The pilot assembly includes a pilot valve seat and a plug. The pilot valve seat is connected to the second end of the front yoke and has an oil inlet channel. The plug is movably disposed in the oil inlet channel. The armature assembly can move relative to the tailstock when the coil assembly is energized, and drive the plug to move to cut off the passage between the oil inlet channel and the oil return hole.

[0014] As a preferred embodiment of the proportional electromagnet provided by this utility model, the oil inlet channel is a stepped hole, the large-diameter end of the stepped hole is set towards the armature assembly and is connected to the oil return hole, the small-diameter end of the stepped hole forms an oil inlet, and when the armature assembly moves, it can drive the sealing member to press against the stepped surface between the large-diameter end and the small-diameter end.

[0015] As a preferred embodiment of the proportional electromagnet provided by this utility model, the sealing element is a spherical structure or a conical structure.

[0016] As a preferred embodiment of the proportional electromagnet provided by this utility model, the armature assembly includes an armature, a push rod, and a return spring. The armature is movably inserted into the tail yoke. One end of the push rod is connected to the armature, and the other end is movably inserted into the through hole. The two ends of the return spring abut against the push rod and the front yoke, respectively.

[0017] As a preferred embodiment of the proportional electromagnet provided by this utility model, a limiting step is formed on the wall of the through hole, one end of the return spring abuts against the limiting step, and is at least partially accommodated in the through hole.

[0018] As a preferred embodiment of the proportional electromagnet provided by this utility model, the push rod is provided with a limiting member, which can abut against the front yoke to limit the maximum displacement of the armature assembly, and the end of the return spring away from the front yoke abuts against the limiting member.

[0019] As a preferred embodiment of the proportional electromagnet provided by this utility model, the stepped surface of the oil inlet channel is a mating surface that can fit against the outer surface of the sealing component.

[0020] As a preferred embodiment of the proportional electromagnet provided by this utility model, the insertion interface is provided with a waterproof component.

[0021] As a preferred embodiment of the proportional electromagnet provided by this utility model, a first sealing element is provided between the coil assembly and the front yoke;

[0022] And / or, a second seal is provided between the coil assembly and the tailstock;

[0023] And / or, a third seal is provided between the plug assembly and the housing body;

[0024] And / or, a fourth seal is provided between the plug assembly and the tail.

[0025] As a preferred embodiment of the proportional electromagnet provided by this utility model, the first end opening is constricted and fits tightly against the outer periphery of the plug assembly.

[0026] The beneficial effects of this utility model are:

[0027] The proportional electromagnet provided by this utility model, by setting the axial direction of the plug assembly's interface perpendicular to the axial direction of the housing body, can reduce the overall size of the proportional electromagnet along the housing body's axial direction, thus meeting the miniaturization design requirements of proportional electromagnets to a certain extent. Furthermore, when connected to an external power source, the proportional electromagnet plugs into the external power source along a direction perpendicular to the housing body's axial direction, significantly reducing the installation space required for applications with limited installation space. In addition, compared to proportional electromagnets in related technologies, this proportional electromagnet, by directly connecting the pilot valve seat to the front yoke, eliminates the need for a separate pilot magnetic seat. That is, the front yoke simultaneously integrates the pilot function to regulate pressure output, achieving pilot control. This also simplifies assembly and processing procedures, improves assembly efficiency, and reduces processing costs. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the proportional electromagnet provided in Embodiment 1 of this utility model;

[0029] Figure 2 This is a cross-sectional schematic diagram of the proportional electromagnet provided in Embodiment 1 of this utility model;

[0030] Figure 3 This is a cross-sectional schematic diagram of the armature assembly and the pilot assembly provided in Embodiment 1 of this utility model;

[0031] Figure 4 This is a schematic diagram of the plug assembly provided in Embodiment 1 of this utility model;

[0032] Figure 5This is a schematic diagram of the coil assembly provided in Embodiment 1 of this utility model;

[0033] Figure 6 yes Figure 5 A magnified view of a portion at point A;

[0034] Figure 7 This is a cross-sectional schematic diagram of the proportional electromagnet provided in Embodiment 2 of this utility model.

[0035] In the picture:

[0036] 10. Outer shell; 11. Shell body; 111. First end opening; 112. Second end opening; 12. Front yoke; 121. Through hole; 122. Guide groove; 123. Limiting step; 124. Oil return hole;

[0037] 20. Plug assembly; 21. Socket; 210. Plug interface; 22. Pin; 23. Electrical connector; 24. Waterproof component;

[0038] 30. Coil assembly; 31. Coil frame; 310. Mounting hole; 311. First conical sealing surface; 312. Second conical sealing surface; 32. Coil; 321. Terminal;

[0039] 40. Wei E;

[0040] 50. Armature assembly; 51. Armature; 510. Insertion hole; 52. Push rod; 521. Limiting component; 53. Return spring;

[0041] 61. First seal; 62. Second seal; 63. Third seal; 64. Fourth seal;

[0042] 70. Pilot assembly; 71. Pilot valve seat; 710. Oil inlet passage; 72. Sealing component. Detailed Implementation

[0043] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0044] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] Example 1

[0047] like Figures 1-3 As shown, this embodiment provides a proportional electromagnet, which includes a housing 10, a plug assembly 20, a coil assembly 30, a tail 40, an armature assembly 50, and a pilot assembly 70. The housing 10 includes a housing body 11 and a front yoke 12. The housing body 11 has a first end opening 111 and a second end opening 112 disposed opposite to each other. The front yoke 12 is connected to the second end opening 112 and has a through hole 121 inside. An oil return hole 124 communicating with the through hole 121 is provided on the side wall of the front yoke 12. The tail 40 is disposed in the housing body 11 and is disposed opposite to the first end of the front yoke 12. The coil assembly 30 is disposed in the housing body 11 and surrounds the front yoke 12 and the tail 40. The plug assembly 20 is sealed to the first end opening 111 and electrically connected to the coil assembly 30. The plug assembly 20 has a plug interface 210, and the axis of the plug interface 210 is perpendicular to the axis of the housing body 11. An electrical connector 23 for connecting to an external power source is provided in the plug interface 210. One end of the armature assembly 50 is movably inserted into the tail 40, and the other end is movably inserted into the through hole 121. The pilot assembly 70 includes a pilot valve seat 71 and a sealing member 72. The pilot valve seat 71 is connected to the second end of the front yoke 12 and has an oil inlet channel 710. The sealing member 72 is movably disposed in the oil inlet channel 710. The armature assembly 50 can move relative to the tail 40 when the coil assembly 30 is energized, and drive the sealing member 72 to move to cut off the passage between the oil inlet channel 710 and the oil return hole 124.

[0048] The proportional electromagnet provided in this embodiment, by setting the axial direction of the plug interface 210 of the plug assembly 20 perpendicular to the axial direction of the housing body 11, can reduce the overall size of the proportional electromagnet along the axial direction of the housing body 11, thus meeting the miniaturization design requirements of the proportional electromagnet to a certain extent. Furthermore, when connected to an external power source, the proportional electromagnet is plugged into the external power source along a direction perpendicular to the axial direction of the housing body 11, which can greatly reduce the installation space of the proportional electromagnet, making it suitable for applications with limited installation space. In addition, compared to proportional electromagnets in related technologies, this proportional electromagnet, by directly connecting the pilot valve seat 71 to the front yoke 12, can eliminate the need for a pilot magnetic seat. That is, the front yoke 12 simultaneously integrates pilot function to regulate pressure output and achieve pilot control, simplifying assembly and processing procedures, improving assembly efficiency, and reducing processing costs.

[0049] In some embodiments, the oil inlet channel 710 is a stepped hole, with the large-diameter end of the stepped hole facing the armature assembly 50 and connected to the oil return hole 124. The small-diameter end of the stepped hole forms an oil inlet. When the armature assembly 50 moves, it can drive the sealing member 72 to press against the stepped surface between the large-diameter end and the small-diameter end.

[0050] When the coil assembly 30 is not energized, the hydraulic oil at the inlet can push open the sealing member 72, allowing it to flow through the gap between the oil inlet channel 710 and the sealing member 72 to the return oil hole 124. When the coil assembly 30 is energized, a ring magnetic field is generated along the shell body 11, tail 40, and front yoke 12. Under the action of the ring magnetic field, the armature assembly 50 can move along its own axis and press the sealing member 72 against the stepped surface of the oil inlet channel 710, thereby cutting off the channel between the oil inlet and the return oil hole 124. The working principle of the proportional electromagnet is existing technology and will not be described in detail in this embodiment.

[0051] In this embodiment, the sealing element 72 has a spherical structure, which facilitates processing and assembly. Of course, in other embodiments, the sealing element 72 can also have a conical structure.

[0052] In some embodiments, the stepped surface of the oil inlet channel 710 is a mating surface that can conform to the outer surface of the sealing member 72. For example, when the sealing member 72 has a spherical structure, the stepped surface of the oil inlet channel 710 is arc-shaped; when the sealing member 72 has a conical structure, the stepped surface of the oil inlet channel 710 is inclined. This design can increase the contact area between the sealing member 72 and the stepped surface of the stepped hole, thereby further ensuring the sealing performance of the sealing member 72 to the stepped surface of the stepped hole. In this embodiment, the sealing member 72 is made of steel.

[0053] In some embodiments, the armature assembly 50 includes an armature 51, a push rod 52, and a return spring 53. The armature 51 is movably inserted into the tail 40. One end of the push rod 52 is connected to the armature 51, and the other end is movably inserted into the through hole 121. The two ends of the return spring 53 abut against the push rod 52 and the front yoke 12, respectively. When the proportional electromagnet is working, the armature 51 can move relative to the tail 40 when the coil assembly 30 is energized, simultaneously driving the push rod 52 to move relative to the front yoke 12, thereby pressing the sealing member 72 onto the stepped surface of the pilot valve seat 71. Then, the armature 51 can be reset under the elastic restoring force of the return spring 53, thereby realizing the reciprocating movement of the armature 51 and the push rod 52. Among them, the return spring 53 has a large elastic restoring force, is easy to assemble, and has a low cost.

[0054] In some embodiments, the armature 51 has a insertion hole 510, and one end of the push rod 52 is interference-fitted into the insertion hole 510, thereby achieving a fixed connection between the armature 51 and the push rod 52, and ensuring that the push rod 52 can move synchronously when the armature 51 moves. In addition, this connection method is convenient to operate and can reduce the number of parts and reduce processing costs.

[0055] In some embodiments, a limiting step 123 is formed on the wall of the through hole 121 of the front yoke 12. One end of the return spring 53 abuts against the limiting step 123 and is at least partially accommodated in the through hole 121. This arrangement allows for both positioning and installation of the return spring 53, and also limits its extension and retraction, ensuring that it always extends and retracts along its own axial direction.

[0056] In some embodiments, a limiting member 521 is provided on the push rod 52. The limiting member 521 can abut against the front yoke 12 to limit the maximum displacement of the armature assembly 50. The end of the return spring 53 away from the front yoke 12 abuts against the limiting member 521. Specifically, when the armature assembly 50 moves to the position where the limiting member 521 abuts against the front yoke 12, it is the maximum displacement of the armature assembly 50, which is also the maximum stroke of the proportional electromagnet.

[0057] For example, the limiting member 521 is a limiting washer. The limiting washer has a certain elastic force, which allows the limiting member 521 and the front yoke 12 to make flexible contact, avoiding damage to one of them when they collide, thereby ensuring the safety of the proportional electromagnet. Optionally, the limiting washer has a notch to facilitate the installation of the limiting washer and the push rod 52.

[0058] In other embodiments, the limiting member 521 may also be a protruding structure protruding from the outer periphery of the push rod 52 to simplify the processing steps and improve assembly efficiency.

[0059] like Figures 4-6 and combined Figure 2As shown, the plug assembly 20 includes a socket 21 and a pin 22 disposed on the socket 21. The socket 21 is sealed to the first end opening 111. The plug interface 210 is opened on the socket 21. The pin 22 is electrically connected to the coil assembly 30.

[0060] Specifically, the coil assembly 30 includes a coil frame 31 and a coil 32 wound on the coil frame 31. The coil frame 31 is arranged around the front yoke 12 and the tail yoke 40, and a mounting hole 310 is provided on the coil frame 31. The pin 22 and the terminal 321 of the coil 32 are interference-fitted into the mounting hole 310 so that the pin 22 and the terminal 321 abut against each other. By providing a mounting hole 310 on the coil frame 31, the terminal 321 of the coil 32 and the pin 22 are interference-fitted into the mounting hole 310, thereby achieving stable installation of the pin 22 and the terminal 321 in the mounting hole 310, while ensuring that they abut against each other, thus achieving a stable electrical connection.

[0061] To facilitate the quick insertion of the pin 22 into the mounting hole 310, the end of the pin 22 is truncated cone-shaped. The truncated cone-shaped structure provides a guide for the pin 22 to be inserted into the mounting hole 310, enabling it to be inserted into the mounting hole 310 quickly and accurately.

[0062] In some embodiments, a waterproof component 24 is provided in the connector 210 to ensure the waterproof seal of the plug assembly 20, preventing the plug assembly 20 from getting damp and short-circuiting during use, thereby ensuring the safety of the entire proportional electromagnet. Optionally, the waterproof component 24 is a waterproof rubber gasket, which has good waterproof effect, is easy to install, and has low cost.

[0063] like Figure 2 As shown, a first sealing element 61 is provided between the inner wall of the coil assembly 30 (specifically the coil frame 31) and the front yoke 12. A second sealing element 62 is provided between the inner wall of the coil assembly 30 (specifically the coil frame 31) and the tail yoke 40. The first sealing element 61 and the second sealing element 62 ensure the sealing between the coil frame 31 and the front yoke 12, and between the coil frame 31 and the tail yoke 40. This ensures that the coil assembly 30 has good insulation, waterproof, corrosion resistance, and heat dissipation performance, while eliminating the need for encapsulation of the coil assembly 30, simplifying the assembly process, improving assembly efficiency, and reducing production costs to some extent.

[0064] In some embodiments, one end of the coil frame 31 is provided with a first conical sealing surface 311, which is inclined from top to bottom away from the central axis of the coil frame 31. The first sealing element 61 is located between the first conical sealing surface 311 and the front yoke 12. The other end of the coil frame 31 is provided with a second conical sealing surface 312, which is inclined from bottom to top away from the central axis of the coil frame 31. The second sealing element 62 is located between the second conical sealing surface 312 and the tail yoke 40. By providing the first conical sealing surface 311 and the second conical sealing surface 312 on the coil frame 31, reliable installation of the first sealing element 61 and the second sealing element 62 can be achieved, ensuring good sealing performance between the coil assembly 30 and the front yoke 12, and between the coil assembly 30 and the tail yoke 40.

[0065] Optionally, both the first seal 61 and the second seal 62 can be rubber sealing rings, which have a simple structure, are easy to install, and have a good sealing effect.

[0066] It should be noted that the directional terms such as "up," "down," "inner," and "outer" used in this embodiment are all in the context of... Figure 2 The description of the orientation and positional relationships shown should not be construed as limiting this embodiment.

[0067] Continue as Figure 2 As shown, a third seal 63 is provided between the plug assembly 20 (specifically, the socket 21) and the housing body 11 to ensure the sealing performance between the plug assembly 20 and the housing body 11. A fourth seal 64 is provided between the plug assembly 20 (specifically, the socket 21) and the tail 40 to ensure the sealing performance between the plug assembly 20 and the tail 40. Optionally, both the third seal 63 and the fourth seal 64 can be rubber sealing rings, which have a simple structure, are easy to install, and have a good sealing effect.

[0068] In this embodiment, the tail 40 and the shell body 11 are interference-fitted, which facilitates assembly and ensures stable installation between the two.

[0069] In some embodiments, the first end opening 111 is constricted and fits tightly against the outer periphery of the plug assembly 20 (specifically, the socket 21). Specifically, after the coil assembly 30, tail 40, armature assembly 50, pilot assembly 70, and plug assembly 20 are all installed on the housing body 11, the first end opening 111 of the housing body 11 is rolled to complete the encapsulation, thereby ensuring the overall stability and sealing of the proportional electromagnet. Simultaneously, it ensures that the ring plug assembly 20, tail 40, coil assembly 30, and front yoke 12 are correspondingly and tightly abutted, further guaranteeing the connection quality of the terminals 321 and pins 22, preventing them from falling off during use and affecting the performance of the proportional electromagnet.

[0070] Example 2

[0071] This embodiment provides a proportional electromagnet, the specific structure of which is roughly the same as that of the proportional electromagnet provided in Embodiment 1, the difference being that the armature 51 and the front armature 121 have different structures.

[0072] Specifically, such as Figure 7 As shown, a guide groove 122 is provided at the first end of the front yoke 12, and the end of the armature 51 facing away from the tail 40 is guided and fitted into the guide groove 122. The guide groove 122 can provide guidance for the movement of the armature 51, thereby ensuring the stability of the armature assembly 50 during movement.

[0073] For example, the depth of the guide groove 122 is 2.0mm to 5.0mm. Users can select a front yoke 12 with a suitable guide groove 122 depth according to actual usage needs to meet the stroke requirements of the proportional electromagnet. For example, the depth of the guide groove 122 can be 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, etc. Of course, in other embodiments, the depth of the guide groove 122 can also be any other value between 2.0mm and 5.0mm.

[0074] In some embodiments, the first end of the front yoke 12 is frustum-shaped. This arrangement significantly reduces the air gap reluctance, allowing the magnetic field lines to pass through the air gap more concentratedly, forming a more uniform magnetic field distribution and avoiding edge scattering or distortion of the magnetic field. Furthermore, it increases the contact area between the magnetic poles and the air gap, increasing the air gap permeability, thereby generating a stronger magnetic field and a greater initial attraction under the same excitation current. Simultaneously, setting the end of the front yoke 12 to a frustum shape also serves as a guide, improving the alignment between the front yoke 12 and the coil assembly 30 and increasing assembly efficiency.

[0075] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A proportional electromagnet, characterized in that, include: The outer shell (10) includes a shell body (11) and a front yoke (12). The shell body (11) has a first end opening (111) and a second end opening (112) disposed opposite to each other. The front yoke (12) is connected to the second end opening (112). The front yoke (12) has a through hole (121). The side wall of the front yoke (12) is provided with an oil return hole (124) that communicates with the through hole (121). The tail (40) is disposed in the shell body (11) and is disposed opposite to the first end of the front yoke (12); A coil assembly (30) is disposed in the shell body (11) and surrounds the front yoke (12) and the tail yoke (40); The plug assembly (20) is sealed to the first end opening (111) and electrically connected to the coil assembly (30). The plug assembly (20) has a plug interface (210), and the axis of the plug interface (210) is perpendicular to the axis of the shell body (11). The plug interface (210) is provided with an electrical connector (23) for connecting to an external power source. An armature assembly (50) is provided, with one end of the armature assembly (50) movably inserted into the tailstock (40) and the other end movably inserted into the through hole (121); The pilot assembly (70) includes a pilot valve seat (71) and a plug (72). The pilot valve seat (71) is connected to the second end of the front yoke (12) and has an oil inlet channel (710). The plug (72) is movably disposed in the oil inlet channel (710). The armature assembly (50) can move relative to the tailstock (40) when the coil assembly (30) is energized, and drive the plug (72) to move to cut off the passage between the oil inlet channel (710) and the return oil hole (124).

2. The proportional electromagnet according to claim 1, characterized in that, The oil inlet channel (710) is a stepped hole. The large diameter end of the stepped hole is set towards the armature assembly (50) and is connected to the oil return hole (124). The small diameter end of the stepped hole forms an oil inlet. When the armature assembly (50) moves, it can drive the sealing member (72) to press against the stepped surface between the large diameter end and the small diameter end.

3. The proportional electromagnet according to claim 2, characterized in that, The sealing element (72) has a spherical or conical structure.

4. The proportional electromagnet according to claim 2, characterized in that, The armature assembly (50) includes an armature (51), a push rod (52), and a return spring (53). The armature (51) is movably inserted into the tail yoke (40). One end of the push rod (52) is connected to the armature (51), and the other end is movably inserted into the through hole (121). The two ends of the return spring (53) abut against the push rod (52) and the front yoke (12), respectively.

5. The proportional electromagnet according to claim 4, characterized in that, A limiting step (123) is formed on the wall of the through hole (121), and one end of the return spring (53) abuts against the limiting step (123) and is at least partially accommodated in the through hole (121).

6. The proportional electromagnet according to claim 4, characterized in that, The push rod (52) is provided with a limiting member (521), which can abut against the front yoke (12) to limit the maximum displacement of the armature assembly (50). The end of the return spring (53) away from the front yoke (12) abuts against the limiting member (521).

7. The proportional electromagnet according to claim 2, characterized in that, The stepped surface of the oil inlet channel (710) is a mating surface that can fit with the outer surface of the sealing member (72).

8. The proportional electromagnet according to claim 1, characterized in that, The connector (210) is provided with a waterproof component (24).

9. The proportional electromagnet according to claim 1, characterized in that, A first seal (61) is provided between the coil assembly (30) and the front yoke (12). And / or, a second seal (62) is provided between the coil assembly (30) and the tail (40). And / or, a third seal (63) is provided between the plug assembly (20) and the housing body (11). And / or, a fourth seal (64) is provided between the plug assembly (20) and the tail (40).

10. The proportional electromagnet according to any one of claims 1 to 9, characterized in that, The first end opening (111) is constricted and fits tightly against the outer periphery of the plug assembly (20).

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