Electromagnet assembly and solenoid valve

Abstract

The utility model belongs to solenoid valve technical field discloses a kind of electromagnet assembly and solenoid valve.This electromagnet assembly includes magnetic conducting sleeve, coil, moving iron component and limit block, coil is set to the magnetic conducting sleeve outer periphery, magnetic conducting sleeve is opened with the sliding slot along X axis, X axis is parallel with the axial direction of magnetic conducting sleeve;Moving iron component is slidably set in the sliding slot along X axis;Limit block is made of non-magnetic material, limit block is set in the groove bottom of sliding slot, and along X axis direction, the end surface of limit block projects from the groove bottom of sliding slot.When moving iron component moves to limit position along X axis towards the groove bottom of sliding slot, moving iron component abuts to the end surface of limit block, and the end surface of limit block projects from the groove bottom of sliding slot, so that there is interval between moving iron component and the groove bottom of sliding slot, so that moving iron component cannot enter attraction area, prevent the electromagnetic force abrupt rise caused solenoid valve opening speed mutation, and moving iron component and the groove bottom of sliding slot can be prevented attraction, guarantee the performance stability of solenoid valve.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve technology, and in particular to an electromagnet assembly and an electromagnetic valve. Background Technology

[0002] Solenoid valves are widely used in applications requiring automatic fluid control due to their fast response and high control precision. A solenoid valve consists of two parts: an electromagnet assembly and a hydraulic assembly. The electromagnet assembly includes a magnetic sleeve and a moving iron. The magnetic sleeve has a groove, and the moving iron is slidably positioned within this groove. When the solenoid valve is energized, it generates electromagnetic force, allowing the moving iron to slide within the groove. When the moving iron slides close to the bottom of the groove to a certain distance, it enters the attraction zone, where the electromagnetic force suddenly increases, causing a drastic change in the solenoid valve's performance. Furthermore, when the moving iron is attracted to the bottom of the groove, it affects the movement of the moving iron, leading to abnormal solenoid valve performance.

[0003] Therefore, there is a need to provide an electromagnet assembly and a solenoid valve to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide an electromagnet assembly and an electromagnet valve, in which the moving iron assembly cannot enter the pull-in area, the electromagnetic force is stable, and the performance of the electromagnet valve is stable.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An electromagnet assembly, the electromagnet assembly comprising:

[0007] A magnetic sleeve and a coil, wherein the coil is disposed on the outer periphery of the magnetic sleeve, and the magnetic sleeve is provided with a sliding groove along the X-axis, the X-axis being parallel to the axial direction of the magnetic sleeve;

[0008] The moving iron assembly is slidably disposed in the groove along the X-axis;

[0009] The limiting block is made of a non-magnetic material. The limiting block is disposed at the bottom of the groove, and the end face of the limiting block protrudes from the bottom of the groove along the X-axis.

[0010] Preferably, the height h of the end face of the limiting block protruding from the bottom of the groove is 0.3mm-0.6mm.

[0011] Preferably, the magnetic sleeve has an installation groove that communicates with the sliding groove, and the limiting block is accommodated in the installation groove.

[0012] Preferably, the moving iron assembly includes:

[0013] The moving iron body is slidably disposed in the groove along the X-axis;

[0014] An elastic element extends along the X-axis, one end of which is connected to or abuts against the moving iron body, and the other end of which is connected to or abuts against the limiting block.

[0015] Preferably, the end face of the limiting block protruding from the bottom of the groove is provided with a guide portion, the guide portion is coaxially arranged with the elastic element, and the other end of the elastic element is sleeved on the guide portion and connected to or abutting against the limiting block.

[0016] Preferably, the moving iron body has a receiving groove along the X-axis, at least part of the elastic element is received in the receiving groove, and one end of the elastic element is connected to or abuts against the bottom of the receiving groove.

[0017] Preferably, the electromagnet assembly further includes:

[0018] A lubricant is disposed in the radial gap between the magnetic sleeve and the moving iron assembly.

[0019] A solenoid valve includes a hydraulic assembly and the aforementioned electromagnet assembly, the hydraulic assembly comprising:

[0020] The main valve sleeve is connected to one end of the magnetic sleeve. The main valve sleeve has a first chamber and has an oil inlet, an oil outlet, and a valve port that are all connected to the first chamber. The valve port is located between the oil inlet and the oil outlet.

[0021] The main valve core is disposed in the first chamber and is slidable along the X-axis to block or open the valve port. The main valve core has a second chamber, a first through hole and a second through hole. The first through hole and the second through hole are both connected to the second chamber. The first through hole is connected to the oil inlet and the second through hole is connected to the oil outlet.

[0022] A pilot valve core is located at least partially in the second chamber, one end of which is connected to the moving iron assembly. The pilot valve core is slidable to block or open the second through hole.

[0023] Preferably, the solenoid valve further includes:

[0024] A retaining ring is disposed at the end of the main valve sleeve away from the valve port and located in the first chamber. The retaining ring is used to limit the movement of the main valve core along the X-axis away from the valve port to the extreme position.

[0025] Preferably, the main valve sleeve is threaded to one end of the magnetic sleeve.

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

[0027] This electromagnet assembly includes a magnetic sleeve, a coil, a moving iron assembly, and a limiting block. The coil is disposed on the outer periphery of the magnetic sleeve, and the magnetic sleeve has a groove along the X-axis, which is parallel to the axial direction of the magnetic sleeve. The moving iron assembly is slidably disposed in the groove along the X-axis. The limiting block is made of a non-magnetic material and is disposed at the bottom of the groove, with its end face protruding from the bottom of the groove along the X-axis.

[0028] By setting a coil around the outer periphery of the magnetic sleeve, when current is applied to the electromagnet assembly, the coil generates an axial electromagnetic field. This magnetic field magnetizes the magnetic sleeve and the moving iron assembly, causing an electromagnetic force between them. This causes the moving iron assembly to slide along the X-axis within the groove under the action of the electromagnetic force. A limit block is set at the bottom of the groove of the magnetic sleeve, and the end face of the limit block protrudes from the bottom of the groove along the X-axis. When the moving iron assembly moves to its limit position along the X-axis toward the bottom of the groove, the moving iron assembly abuts against the end face of the limit block, with a gap between it and the bottom of the groove. This prevents the moving iron assembly from entering the engagement zone, thus preventing a sudden increase in electromagnetic force that could cause a sudden change in the opening speed of the solenoid valve. It also prevents the moving iron assembly from engaging with the bottom of the groove, ensuring the stable performance of the solenoid valve. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view of a solenoid valve provided in one embodiment of this utility model;

[0030] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0031] Figure 3 This is a cross-sectional view of a solenoid valve provided in another embodiment of this utility model;

[0032] Figure 4 yes Figure 1 A magnified view of a section at point B.

[0033] In the picture:

[0034] 1. Magnetic sleeve; 11. Slide groove; 12. Limiting step; 13. Mounting groove;

[0035] 2. Coil;

[0036] 3. Moving iron assembly; 31. Moving iron body; 311. Receiving groove; 312. First through groove; 32. Elastic element;

[0037] 4. Limiting block; 41. Guide section;

[0038] 5. Lubricating components;

[0039] 6. Main valve sleeve; 61. First chamber; 62. Oil inlet; 63. Oil outlet;

[0040] 7. Main valve core; 71. Second chamber; 72. First through hole; 73. Second through hole; 74. First conical surface;

[0041] 8. Pilot valve core; 81. Second conical surface; 82. Second through groove;

[0042] 91. Retaining ring; 92. Locking nut; 93. Limiting component. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[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, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to 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 based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly 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] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0047] Solenoid valves are widely used in applications requiring automatic fluid control due to their fast response and high control precision. A solenoid valve consists of two parts: an electromagnet assembly and a hydraulic assembly. The electromagnet assembly includes a magnetic sleeve and a moving iron. The magnetic sleeve has a groove, and the moving iron is slidably positioned within this groove. When the solenoid valve is energized, it generates electromagnetic force, allowing the moving iron to slide within the groove. When the moving iron slides close to the bottom of the groove to a certain distance, it enters the engagement zone, where the electromagnetic force suddenly increases, causing a drastic change in the solenoid valve's performance. Furthermore, when the moving iron is attracted to the bottom of the groove, it affects the movement of the moving iron, leading to abnormal solenoid valve performance.

[0048] Therefore, such as Figures 1-4 As shown, this embodiment provides an electromagnet assembly, which includes a magnetic sleeve 1, a coil 2, a moving iron assembly 3, and a limiting block 4. The coil 2 is disposed on the outer periphery of the magnetic sleeve 1. The magnetic sleeve 1 has a groove 11 along the X-axis, and the X-axis is parallel to the axial direction of the magnetic sleeve 1. The moving iron assembly 3 is slidably disposed in the groove 11 along the X-axis. The limiting block 4 is made of a non-magnetic material and is disposed at the bottom of the groove 11. Along the X-axis direction, the end face of the limiting block 4 protrudes from the bottom of the groove 11.

[0049] By setting a coil 2 around the outer periphery of the magnetic sleeve 1, when current is applied to the electromagnet assembly, the coil 2 generates an axial electromagnetic field. This magnetic field magnetizes the magnetic sleeve 1 and the moving iron assembly 3, causing an electromagnetic force between them. As a result, the moving iron assembly 3 slides along the X-axis in the slide groove 11 under the action of the electromagnetic force. A limit block 4 is set at the bottom of the slide groove 11 of the magnetic sleeve 1, and the end face of the limit block 4 protrudes from the bottom of the slide groove 11 along the X-axis. When the moving iron assembly 3 moves to the limit position along the X-axis toward the bottom of the slide groove 11, the moving iron assembly 3 abuts against the end face of the limit block 4, and there is a gap between it and the bottom of the slide groove 11. This prevents the moving iron assembly 3 from entering the attraction area, preventing a sudden increase in electromagnetic force that could cause a sudden change in the opening speed of the solenoid valve. It also prevents the moving iron assembly 3 from being attracted to the bottom of the slide groove 11, ensuring the stable performance of the solenoid valve.

[0050] In this embodiment, as Figure 1 , Figure 3 As shown, the electromagnet assembly also includes a locking nut 92. One end of the magnetic sleeve 1 has a limiting step 12. The coil 2 is sleeved on the magnetic sleeve 1, with one end of the coil 2 abutting against the limiting step 12. The locking nut 92 is threaded to the outer periphery of the magnetic sleeve 1, and the other end of the coil 2 abuts against the locking nut 92, thereby fixing the coil 2 to the outer periphery of the magnetic sleeve 1. It should be noted that the coil 2 can also be fixed to the outer periphery of the magnetic sleeve 1 using other connection methods in the prior art, and this embodiment does not limit this.

[0051] Specifically, the limiting block 4 can be made of materials such as stainless steel, aluminum, and copper.

[0052] Optionally, such as Figure 2 , Figure 4 As shown, the height h of the end face of the limiting block 4 protruding from the bottom of the slide groove 11 is 0.3mm-0.6mm. The area between 0.3mm and 0.6mm from the bottom of the slide groove 11 is the attraction zone. The 0.3mm-0.6mm protrusion of the end face of the limiting block 4 from the bottom of the slide groove 11 ensures that when the moving iron assembly 3 moves along the X-axis towards the bottom of the slide groove 11 to its limit position, it remains 0.3mm-0.6mm away from the bottom of the slide groove 11 and has not entered the attraction zone, thus preventing a sudden increase in electromagnetic force. It should be noted that the specific height of the end face of the limiting block 4 protruding from the bottom of the slide groove 11 depends on actual needs and only needs to be between 0.3mm and 0.6mm. This embodiment does not limit this. For example, h can be 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, or 0.6mm.

[0053] In one alternative embodiment, such as Figure 1 , Figure 2 As shown, the limiting block 4 is directly disposed at the bottom of the slide groove 11. The thickness of the limiting block 4 along the X-axis is 0.3mm-0.6mm, ensuring that the end face of the limiting block 4 protrudes from the bottom of the slide groove 11 by a height h of 0.3mm-0.6mm. In specific implementation, the limiting block 4 can be fixed to the bottom of the slide groove 11 by adhesive or by screw thread connection. The specific fixing method of the limiting block 4 is not limited in this embodiment.

[0054] In another alternative embodiment, such as Figure 3 , Figure 4 As shown, the magnetic sleeve 1 has a mounting groove 13, which communicates with the sliding groove 11. The limiting block 4 is housed within the mounting groove 13. The mounting groove 13 provides a clear installation position for the limiting block 4, allowing it to be quickly and accurately installed onto the magnetic sleeve 1. When the limiting block 4 is housed within the mounting groove 13, its side surface is partially enclosed by the magnetic sleeve 1, preventing it from shifting and ensuring its stability. It should be noted that the thickness of the limiting block 4 along the X-axis is 0.3mm-0.6mm greater than the groove depth of the mounting groove 13 along the X-axis. This ensures that when the limiting block 4 is housed within the mounting groove 13, its end face protrudes beyond the bottom of the sliding groove 11 by 0.3mm-0.6mm.

[0055] In one optional embodiment, the limiting block 4 is bonded to the mounting groove 13 with adhesive; in another optional embodiment, the limiting block 4 is snapped into the mounting groove 13; and in yet another optional embodiment, the limiting block 4 is threadedly connected to the mounting groove 13 with screws. It should be noted that the specific fixing method of the limiting block 4 is not limited in this embodiment.

[0056] Optionally, such as Figure 1 , Figure 3 As shown, the moving iron assembly 3 includes a moving iron body 31 and an elastic element 32. The moving iron body 31 is slidably disposed in the slide groove 11 along the X-axis; the elastic element 32 extends along the X-axis, with one end connected to or abutting against the moving iron body 31, and the other end connected to or abutting against the limiting block 4. When the coil 2 is energized, it generates an electromagnetic force. When the electromagnetic force is greater than the preload of the elastic element 32, the moving iron body 31 overcomes the elastic force of the elastic element 32 and moves along the X-axis toward the limiting block 4 to compress the elastic element 32. When the coil 2 is de-energized, the electromagnetic force disappears, and the elastic force of the elastic element 32 drives the moving iron body 31 to move away from the limiting block 4 along the X-axis to reset. The preload of the elastic element 32 is determined according to actual needs, and only needs to meet the required range of the solenoid valve.

[0057] Specifically, the elastic element 32 can be a spring.

[0058] Specifically, such as Figures 1-4 As shown, the end face of the limiting block 4 protruding from the bottom of the groove 11 is provided with a guide portion 41. The guide portion 41 is coaxially arranged with the elastic element 32, and the other end of the elastic element 32 is sleeved on the guide portion 41 and connected to or abutting against the limiting block 4. The guide portion 41 and the elastic element 32 are coaxially arranged, and the other end of the elastic element 32 is sleeved on the guide portion 41, so that the guide portion 41 provides guidance for the extension and retraction of the elastic element 32, so that the elastic element 32 always moves only along the X-axis. This ensures that the moving iron can only move along the X-axis under the action of the elastic force of the elastic element 32, preventing the moving iron body 31 from wearing unevenly with the magnetic sleeve 1, and ensuring the stability of the electromagnet assembly. Furthermore, by setting the guide portion 41, the assembly of the elastic element 32 can be made easier and more convenient, improving the assembly efficiency of the electromagnet assembly. Specifically, the guide portion 41 is a cylinder, and its specific length and outer diameter are determined according to actual needs, which are not limited in this embodiment.

[0059] Optionally, such as Figure 1 , Figure 3 As shown, the moving iron body 31 has a receiving groove 311 along the X-axis, and at least a portion of the elastic element 32 is received in the receiving groove 311. One end of the elastic element 32 is connected to or abuts against the bottom of the receiving groove 311. On the one hand, by providing the receiving groove 311 and allowing at least a portion of the elastic element 32 to be received in the receiving groove 311, the axial length of the electromagnet assembly can be shortened, and the space of the sliding groove 11 of the magnetic sleeve 1 can be fully utilized. On the other hand, the receiving groove 311 can form a radial constraint on the elastic element 32, preventing the elastic element 32 from bending or shifting laterally during the extension and contraction process.

[0060] Optionally, such as Figure 1 , Figure 3As shown, the moving iron body 31 has a first through groove 312 extending along the X-axis to connect the chambers at the left and right ends of the moving iron body 31, so as to prevent the end of the moving iron body 31 facing the limiting block 4 from sealing the chamber formed by the slide groove 11, which would cause abnormal performance of the electromagnet assembly.

[0061] Understandably, both the magnetic sleeve 1 and the moving iron body 31 are made of magnetically conductive material. This material has high permeability, making the magnetic sleeve 1 and the moving iron body 31 easily magnetized, thus improving the response speed and sensitivity of the solenoid valve. Specifically, the magnetic sleeve 1 and the moving iron body 31 are made of iron.

[0062] In one optional embodiment, a copper weld with a magnetic shielding effect is formed on the magnetic sleeve 1. By forming a copper weld on the magnetic sleeve 1, a low magnetic permeability barrier can be formed, allowing the magnetic field to be conducted along a preset path, reducing leakage magnetic loss and improving the utilization rate of the electromagnetic field; weakening residual magnetism, significantly reducing the sticking force of residual magnetism on the moving iron body 31 after the electromagnet assembly is de-energized, and ensuring that the moving iron assembly 3 resets quickly.

[0063] Optionally, such as Figure 1 , Figure 3 As shown, the electromagnet assembly also includes a lubricant 5, which is disposed in the radial gap between the magnetic sleeve 1 and the moving iron assembly 3. The lubricant 5 can reduce the friction between the magnetic sleeve 1 and the moving iron assembly 3, thereby better protecting the magnetic sleeve 1 and the moving iron assembly 3. Specifically, the lubricant 5 is a lubricating cloth with a cylindrical structure, and the lubricating cloth is disposed in the radial gap between the magnetic sleeve 1 and the moving iron assembly 3.

[0064] Specifically, such as Figure 1 , Figure 3 As shown, the electromagnet assembly also includes a limiting member 93, which is disposed within the slide groove 11 and abuts against one end of the lubricating member 5, so as to provide axial limiting and blocking effect for the lubricating member 5. The limiting member 93 is a limiting ring.

[0065] like Figure 1 , Figure 3As shown, this embodiment also provides a solenoid valve, which includes a hydraulic assembly and the aforementioned electromagnet assembly. The hydraulic assembly includes a main valve sleeve 6, a main valve core 7, and a pilot valve core 8. The main valve sleeve 6 is connected to one end of the magnetic sleeve 1. The main valve sleeve 6 has a first chamber 61 and has an oil inlet 62, an oil outlet 63, and a valve port, all of which are connected to the first chamber 61. The valve port is located between the oil inlet 62 and the oil outlet 63. The main valve core 7 is disposed in the first chamber 61 and the main valve core 8 is located in the first chamber 61. The valve core 7 is slidable along the X-axis to block or open the valve port. The main valve core 7 has a second chamber 71, a first through hole 72 and a second through hole 73. The first through hole 72 and the second through hole 73 are both connected to the second chamber 71. The first through hole 72 is connected to the oil inlet 62 and the second through hole 73 is connected to the oil outlet 63. The pilot valve core 8 is at least partially located in the second chamber 71. One end of the pilot valve core 8 is connected to the moving iron assembly 3. The pilot valve core 8 is slidable to block or open the second through hole 73.

[0066] When the solenoid valve is not energized, the coil 2 does not generate an electromagnetic field. At this time, no electromagnetic force is generated between the magnetic sleeve 1 and the moving iron body 31. The preload of the elastic element 32 drives the moving iron body 31 to move away from the limit block 4 along the X-axis, so as to push the pilot valve core 8 to abut against the main valve core 7 to block the second through hole 73. At this time, the oil enters the solenoid valve through the oil inlet 62 and enters the second chamber 71 through the first through hole 72. The hydraulic pressure on both sides of the main valve core 7 is the same. The main valve core 7 abuts against the main valve sleeve 6 and the main valve core 7 blocks the valve port. When the solenoid valve is activated, as the control signal gradually increases, the magnetic induction intensity of the electromagnetic field generated by coil 2 becomes stronger and stronger. When the electromagnetic force generated between the magnetic sleeve 1 and the moving iron body 31 can overcome the elastic force of the elastic element 32, the moving iron body 31 moves along the X-axis toward the limiting block 4, causing the moving iron body 31 to drive the pilot valve core 8 to move synchronously. The second through hole 73 opens, and the oil in the second chamber 71 flows out through the second through hole 73 to the oil outlet 63, thereby reducing the hydraulic pressure in the second chamber 71. The hydraulic pressure at the oil inlet 62 is larger, resulting in a pressure difference between the oil inlet 62 and the second chamber 71. Under the action of this pressure difference, the main valve core 7 moves along the X-axis toward the limiting block 4 to open the valve port, so that the oil in the oil inlet 62 flows out through the oil outlet 63 after passing through the valve port.

[0067] This solenoid valve is suitable for use in the lifting or rotating mechanisms of aerial work platforms, electric forklifts, AGVs, tractors, and harvesters to achieve load holding, up-and-down movement, and speed control of the worktable and agricultural attachments in the lifting or rotating mechanism, or to control the rotation speed of agricultural attachments.

[0068] Optionally, such as Figure 1 , Figure 3As shown, the main valve core 7 has a first conical surface 74, which abuts against the valve port to form a conical seal, thereby ensuring a good sealing effect between the main valve core 7 and the main valve sleeve 6, and thus ensuring that the entire solenoid valve has a low oil leakage rate; the pilot valve core 8 has a second conical surface 81, which abuts against the second through hole 73 to form a conical seal, thereby ensuring a good sealing effect between the main valve core 7 and the pilot valve core 8, and thus better ensuring that the entire solenoid valve has a low oil leakage rate.

[0069] Optionally, the main valve sleeve 6 is threadedly connected to the magnetic sleeve 1. The axial force generated by the thread engagement can tightly connect the main valve sleeve 6 to the magnetic sleeve 1, preventing loosening of the connection due to pressure shocks, etc., and ensuring the stability of the connection between the main valve sleeve 6 and the magnetic sleeve 1.

[0070] Optionally, such as Figure 1 , Figure 3 As shown, the solenoid valve also includes a retaining ring 91, which is disposed at the end of the main valve sleeve 6 away from the valve port and located within the first chamber 61. The retaining ring 91 is used to limit the extreme position of the main valve core 7 moving away from the valve port along the X-axis. By setting the retaining ring 91 to limit the extreme position of the main valve core 7, the design flow rate of this solenoid valve can be achieved.

[0071] Optionally, such as Figure 1 , Figure 3 As shown, a second through groove 82 is provided on the pilot valve core 8, which runs through the X-axis. The second through groove 82 connects the chambers at both ends of the pilot valve core 8, so that the oil pressure at both ends of the pilot valve core 8 is consistent, thereby ensuring the stability of the pilot valve core 8's movement along the X-axis.

[0072] Optionally, one end of the pilot valve core 8 is threadedly connected to the moving iron assembly 3, or one end of the pilot valve core 8 is welded to the moving iron assembly 3, or one end of the moving iron assembly 3 is provided with a T-slot, and one end of the pilot valve core 8 is locked in the T-slot.

[0073] 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 various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments 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. An electromagnet assembly, characterized in that, The electromagnet assembly includes: A magnetic sleeve (1) and a coil (2) are provided. The coil (2) is disposed on the outer periphery of the magnetic sleeve (1). The magnetic sleeve (1) has a groove (11) along the X-axis, and the X-axis is parallel to the axial direction of the magnetic sleeve (1). The moving iron assembly (3) is slidably disposed in the groove (11) along the X-axis; The limiting block (4) is made of non-magnetic material. The limiting block (4) is disposed at the bottom of the groove (11), and the end face of the limiting block (4) protrudes from the bottom of the groove (11) along the X-axis direction.

2. The electromagnet assembly according to claim 1, characterized in that, The height h of the end face of the limiting block (4) protruding from the bottom of the groove (11) is 0.3mm-0.6mm.

3. The electromagnet assembly according to claim 2, characterized in that, The magnetic sleeve (1) has an installation groove (13) which is connected to the sliding groove (11), and the limiting block (4) is housed in the installation groove.

4. The electromagnet assembly according to claim 1, characterized in that, The moving iron assembly (3) includes: The moving iron body (31) is slidably disposed in the groove (11) along the X-axis; An elastic element (32) extends along the X-axis. One end of the elastic element (32) is connected to or abuts against the moving iron body (31), and the other end of the elastic element (32) is connected to or abuts against the limiting block (4).

5. The electromagnet assembly according to claim 4, characterized in that, The limiting block (4) has a guide portion (41) protruding from the bottom of the groove (11). The guide portion (41) is coaxially arranged with the elastic member (32). The other end of the elastic member (32) is sleeved on the guide portion (41) and connected to or abutting against the limiting block (4).

6. The electromagnet assembly according to claim 4, characterized in that, The moving iron body (31) has a receiving groove (311) along the X-axis, and at least part of the elastic element (32) is housed in the receiving groove (311). One end of the elastic element (32) is connected to or abuts against the bottom of the receiving groove (311).

7. The electromagnet assembly according to claim 1, characterized in that, The electromagnet assembly also includes: A lubricating element (5) is disposed in the radial gap between the magnetic sleeve (1) and the moving iron assembly (3).

8. A solenoid valve, characterized in that, The hydraulic assembly includes a hydraulic component and an electromagnet assembly as described in any one of claims 1-7, wherein the hydraulic component comprises: The main valve sleeve (6) is connected to one end of the magnetic sleeve (1). The main valve sleeve (6) has a first chamber (61) and has an oil inlet (62), an oil outlet (63) and a valve port that are all connected to the first chamber (61). The valve port is located between the oil inlet (62) and the oil outlet (63). The main valve core (7) is disposed in the first chamber (61) and the main valve core (7) is slidable along the X-axis to block or open the valve port. The main valve core (7) has a second chamber (71), a first through hole (72) and a second through hole (73). The first through hole (72) and the second through hole (73) are both connected to the second chamber (71). The first through hole (72) is connected to the oil inlet (62) and the second through hole (73) is connected to the oil outlet (63). A pilot valve core (8) is located at least partially in the second chamber (71), one end of which is connected to the moving iron assembly (3), and the pilot valve core (8) is slidable to block or open the second through hole (73).

9. The solenoid valve according to claim 8, characterized in that, The solenoid valve also includes: A retaining ring (91) is disposed at the end of the main valve sleeve (6) away from the valve port and located in the first chamber (61). The retaining ring (91) is used to limit the movement of the main valve core (7) along the X-axis away from the valve port to the extreme position.

10. The solenoid valve according to claim 8, characterized in that, The main valve sleeve (6) is threadedly connected to one end of the magnetic sleeve (1).

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