Electromagnetic proportional valve
By using copper welds and elastic components to distribute electromagnetic force in the electromagnetic proportional valve, the problem of electromagnetic force changing with the movement of the moving iron is solved, thus achieving stability of hydraulic effect and adjustability of flow.
Patent Information
- Application Number
- CN202423128394.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-18
AI Technical Summary
The electromagnetic force output by the electromagnet changes during the movement of the moving iron, resulting in poor hydraulic performance.
The electromagnetic force of the moving iron is distributed along the axial and radial directions by using copper welds. The electromagnetic force of the moving iron is kept constant by the copper welds. Combined with elastic components and cone seal structure, this ensures stable flow of hydraulic oil.
This achieves stability in the magnitude of the electromagnetic force, ensures good hydraulic performance, and avoids hydraulic oil leakage and stable flow regulation.
Smart Images
Figure CN223524095U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to hydraulic valve technical field especially relates to a kind of electromagnetic proportional valve. BACKGROUND
[0002] In hydraulic control system, electromagnetic proportional valve is used to realize the load holding of actuator, and control the linear reciprocating motion speed of hydraulic cylinder or the rotary motion speed of hydraulic motor. When no electromagnetic signal is input, electromagnet does not generate electromagnetic force, and the taper surface of valve core can abut and seal valve seat at this time;When electromagnetic signal is input, valve core can be driven by moving iron to separate from valve seat, so as to realize the return of hydraulic oil. But usually the electromagnetic force output by electromagnet will change due to the movement of moving iron, and then lead to poor hydraulic effect.
[0003] Therefore, an electromagnetic proportional valve is needed to solve the above technical problems. INVENTION CONTENTS
[0004] The utility model aims at providing a kind of electromagnetic proportional valve, to realize the size of electromagnetic force will not change with the movement of moving iron, and then guarantee good hydraulic effect.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] An electromagnetic proportional valve, comprising:
[0007] Electromagnet assembly;
[0008] Hydraulic mechanism, comprising:
[0009] Valve sleeve assembly, at least part is arranged in the electromagnet assembly along axial direction, and the valve sleeve assembly is provided with oil inlet and oil return, and the part of the valve sleeve assembly in the electromagnet assembly is provided with copper welding seam;
[0010] Valve core assembly, comprising main valve core and pilot valve core, the main valve core is movably arranged in the valve sleeve assembly, the main valve core is provided with movable cavity inside, and the main valve core is further provided with oil inlet hole and oil return hole respectively communicated with the oil inlet and the oil return, and the pilot valve core is movably arranged in the movable cavity;
[0011] Moving iron, slidingly arranged in the valve sleeve assembly along axial direction, one end of the moving iron is connected with the pilot valve core, and the electromagnet assembly can drive the moving iron to drive the pilot valve core to move along axial direction, to open or close the oil return hole.
[0012] Preferably, the valve sleeve assembly comprises a magnet conducting sleeve and a main valve sleeve connected with each other, the oil inlet and the oil return are arranged on the main valve sleeve, the magnet conducting sleeve is axially provided with a limiting space, the movable iron is movably arranged in the limiting space and slidably guided by the magnet conducting sleeve, and the brazing seam is arranged along the circumference of the magnet conducting sleeve.
[0013] Preferably, the magnet conducting sleeve is circumferentially provided with a welding groove in communication with the limiting space, and the molten copper liquid can be filled into the welding groove to solidify and form the brazing seam.
[0014] Preferably, the junction of the brazing seam and the limiting space is axially provided with a tool withdrawal groove in communication with the limiting space.
[0015] Preferably, the tool withdrawal groove is a honing annular groove.
[0016] Preferably, the electromagnetic proportional valve further comprises an elastic assembly arranged in the limiting space along the axial direction of the magnet conducting sleeve, and one end of the elastic assembly is connected with or abuts against the magnet conducting sleeve, and the other end of the elastic assembly is connected with or abuts against the movable iron.
[0017] Preferably, the elastic assembly comprises a limiting piece arranged on the magnet conducting sleeve and a first elastic piece, one end of the first elastic piece is connected with or abuts against the limiting piece, and the other end of the first elastic piece is connected with or abuts against the movable iron.
[0018] Preferably, the movable iron is axially provided with a receiving hole, and at least part of the first elastic piece is arranged in the receiving hole.
[0019] Preferably, the main valve core can form a conical seal with the main valve sleeve, and the pilot valve core can form a conical seal with the oil return hole.
[0020] Preferably, the diameter of the oil return hole gradually increases along the direction close to the oil return.
[0021] The utility model discloses the beneficial effects of:
[0022] The utility model discloses an electromagnetic proportional valve. The electromagnetic proportional valve includes electromagnet subassembly and hydraulic mechanism, and the hydraulic mechanism includes valve sleeve subassembly, valve core subassembly and moving iron. The valve sleeve subassembly is arranged in the electromagnet subassembly at least partially along the axial direction, and the valve sleeve subassembly is provided with oil inlet and oil return, and the part of the valve sleeve subassembly in the electromagnet subassembly is provided with brazing seam. The valve core subassembly includes main valve core and pilot valve core, and the main valve core is movably arranged in the valve sleeve subassembly, and the main valve core is provided with movable cavity inside, and the main valve core is also provided with oil inlet hole and oil return hole which are communicated with the oil inlet and the oil return respectively, and the pilot valve core is movably arranged in the movable cavity. The moving iron is slidably arranged in the valve sleeve subassembly along the axial direction, and one end of the moving iron is connected with the pilot valve core, and the electromagnet subassembly can drive the moving iron to move along the axial direction to open or close the oil return. The size of the electromagnetic force of the electromagnetic proportional valve does not change with the movement of the moving iron, and the good hydraulic effect is ensured.
[0023] In the electromagnetic proportional valve, the brazing seam is arranged on the valve sleeve subassembly, and the brazing seam can distribute the electromagnetic force of the moving iron along the axial direction and the radial direction, so that the electromagnetic force received by the moving iron does not change due to the change of position, and the moving iron can drive the pilot valve core to move leftward at a constant speed along the axial direction, when the pilot valve core is separated from the oil return hole, the hydraulic oil can enter the movable cavity through the oil inlet and the oil inlet hole, and then complete the oil return through the oil return hole and the oil return hole. In this process, it is ensured that the moving iron can receive constant electromagnetic force, and good hydraulic effect is generated. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 is the sectional view of the electromagnetic proportional valve provided by the utility model;
[0025] Figure 2 is Figure 1 the local amplification diagram of A part in the figure;
[0026] Figure 3 is Figure 1 the local amplification diagram of B part in the figure.
[0027] In the figure:
[0028] 10, electromagnet subassembly; 11, coil; 12, plug;
[0029] 20, valve sleeve subassembly; 21, oil inlet; 22, oil return; 23, magnetism guide sleeve; 24, main valve sleeve; 25, brazing seam; 251, first bevel; 252, second bevel; 253, first connecting section; 254, first arc section; 255, second arc section; 256, second connecting section; 257, third connecting section; 26, limiting space; 27, tool withdrawal groove;
[0030] 30, valve core assembly; 31, main valve core; 311, movable cavity; 312, oil inlet hole; 313, oil return hole; 32, pilot valve core; 33, nut; 34, second elastic member; 35, limiting block;
[0031] 40, moving iron; 41, accommodating hole;
[0032] 50, elastic assembly; 51, limiting member; 52, first elastic member. DETAILED DESCRIPTION
[0033] The utility model will be described in further detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.
[0034] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0035] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include 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 through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0036] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.
[0037] To solve the problem that the position change of the moving iron in the electromagnetic hydraulic system will cause the change of magnetic induction intensity, such asFigures 1-3 As shown, this embodiment provides an electromagnetic proportional valve, which includes an electromagnet assembly 10 and a hydraulic mechanism; the hydraulic mechanism includes a valve sleeve assembly 20, a valve core assembly 30, and a moving iron 40, wherein at least a portion of the valve sleeve assembly 20 is axially disposed within the electromagnet assembly 10, and the valve sleeve assembly 20 is provided with an oil inlet 21 and an oil return port 22, and the portion of the valve sleeve assembly 20 located within the electromagnet assembly 10 is provided with a copper weld 25; the valve core assembly 30 includes a main valve core 31 and a pilot valve core 32, the main valve... The main valve core 31 is movably disposed within the valve sleeve assembly 20. The main valve core 31 has a movable cavity 311 inside. The main valve core 31 also has an oil inlet hole 312 and an oil return hole 313 that are respectively connected to the oil inlet port 21 and the oil return port 22. The pilot valve core 32 is movably disposed within the movable cavity 311. The moving iron 40 is slidably disposed within the valve sleeve assembly 20 along the axial direction. One end of the moving iron 40 is connected to the pilot valve core 32. The electromagnet assembly 10 can drive the moving iron 40 to drive the pilot valve core 32 to move along the axial direction, so as to open or close the oil return hole 313.
[0038] In this structure, the valve sleeve assembly 20 is provided with a copper weld 25. The copper weld 25 can distribute the electromagnetic force of the moving iron 40 along the axial and radial directions, so that the electromagnetic force on the moving iron 40 does not change due to position changes. This ensures that the moving iron 40 can drive the pilot valve core 32 to move to the left along the axial direction at a constant speed. When the pilot valve core 32 disengages from the return oil hole 313, hydraulic oil can enter the moving chamber 311 through the oil inlet 21 and oil inlet 312, and then return through the return oil hole 313 and return oil port 22 in sequence. This process ensures that the moving iron 40 is subjected to a constant electromagnetic force, thereby producing a good hydraulic effect.
[0039] It should be noted that in this example, the pilot valve core 32 forms a cone seal with the return oil hole 313, and the main valve core 31 forms a cone seal with the valve sleeve assembly 20. At this time, hydraulic oil can only enter the moving chamber 311 sequentially through the oil inlet 21 and the oil inlet hole 312. The main valve core 31 and the pilot valve core 32 effectively prevent hydraulic oil leakage. After the plug 12 of the electromagnet assembly 10 is plugged into the power supply, the coil 11 is energized, and the return oil hole 313 is opened, enabling oil return. Furthermore, as... Figure 3 As shown, the diameter of the return oil hole 313 gradually increases along the direction close to the return oil port 22. This structure can throttle the hydraulic oil on the right side of the return oil hole 313. As the hydraulic oil on the right side of the return oil hole 313 increases, it can indirectly push the main valve core 31 to move to the left, thereby opening the channel between the oil inlet 21 and the return oil port 22, ensuring that the return oil port 22 can output the corresponding hydraulic oil flow, thereby smoothly adjusting the operating speed of the actuator.
[0040] To further clarify, in order to ensure the stability of the electromagnetic proportional valve during operation, such as...Figure 1 As shown in the figure, the magnetic conducting sleeve 23 is locked by the nut 33 at one end of the electromagnet assembly 10, so as to ensure that the magnetic conducting sleeve 23 does not move relative to the electromagnet assembly 10 or separate from the inside of the electromagnet assembly 10 during operation, thereby ensuring good hydraulic effect.
[0041] Specifically, as shown in the figure, Figure 1 The valve sleeve assembly 20 includes the magnetic conducting sleeve 23 and the main valve sleeve 24 connected with each other, the oil inlet 21 and the oil return port 22 are arranged on the main valve sleeve 24, the magnetic conducting sleeve 23 is provided with a limiting space 26 in the axial direction, the movable iron 40 is movably arranged in the limiting space 26 and is in sliding guiding cooperation with the magnetic conducting sleeve 23, and the brazing seam 25 is arranged along the circumference of the magnetic conducting sleeve 23. The separate arrangement of the main valve sleeve 24 and the magnetic conducting sleeve 23 can simplify the machining process of the valve sleeve assembly 20, and also facilitates the arrangement of the brazing seam 25, thereby reducing the manufacturing cost.
[0042] It should be noted that, as shown in the figure, Figure 1 The limiting block 35 is arranged between the main valve sleeve 24 and the magnetic conducting sleeve 23, and the inner wall of the magnetic conducting sleeve 23 and the limiting block 35 jointly form the limiting space 26; in addition, the flatness of the inner wall of the magnetic conducting sleeve 23 is high, the movable iron 40 can not only stably slide in the magnetic conducting sleeve 23, but also effectively reduce the friction between the movable iron 40 and the inner wall of the magnetic conducting sleeve 23, thereby ensuring good hydraulic effect.
[0043] As shown in the figure, Figure 1 and Figure 2 The magnetic conducting sleeve 23 is provided with a welding groove in communication with the limiting space 26 in the circumferential direction, and the molten copper liquid can be filled into the welding groove to solidify and form the brazing seam 25. This kind of arrangement can simplify the manufacturing process of the brazing seam 25, reduce the manufacturing cost, and at the same time improve the isolation effect of the brazing seam 25 on the electromagnetic force. It should be noted that in the present embodiment, the copper liquid is formed by melting copper wire, and the melting point of the copper wire is low, which is convenient for forming the copper liquid, thereby reducing the manufacturing difficulty of the brazing seam 25.
[0044] Specifically, as shown in the figure, Figure 2As shown, the copper welding seam 25 includes a first inclined edge 251 close to the oil inlet 21 side and a second inclined edge 252 away from the oil inlet 21 side, and the first inclined edge 251 and the second inclined edge 251 are sequentially connected by a first connecting section 253, a first arc section 254, a second arc section 255, a second connecting section 256, and a third connecting section 257. The first inclined edge 251 and the outer wall of the moving iron 40 form a first included angle N, the first included angle N is 45° (±0.05°), the second inclined edge 252 and the outer circumference of the limiting space 26 form a second included angle X, the second included angle X is 16° (±0.05°), the first connecting section 253 is arranged in the horizontal direction, the radius of the first arc section 254 and the second arc section 255 is 0.5mm (±0.05mm), the second connecting section 256 is arranged in the horizontal direction, the third connecting section 257 is arranged in the vertical direction, the horizontal distance between the connecting point of the first connecting section 253 and the first inclined edge 251 and the connecting point of the third connecting section 257 and the second inclined edge 252 is 1.9mm (±0.05mm), the horizontal length of the second connecting section 256 is 0.59mm (±0.05mm), the vertical length of the third connecting section 257 is 0.15mm (±0.05mm). This structure facilitates the setting of the corresponding welding seam, thereby filling the corresponding molten copper liquid in the welding seam, and then forming the copper welding seam 25, thereby reducing the manufacturing difficulty; at the same time, the copper welding seam 25 welds the magnetic conducting sleeve 23 into a whole, which can reduce the leakage point while ensuring that the electromagnetic force does not decay with displacement.
[0045] In addition, as shown in Figure 1 and Figure 2 , the junction of the copper welding seam 25 and the limiting space 26 is provided with a tool withdrawal groove 27 in the axial direction, and the tool withdrawal groove 27 communicates with the limiting space 26. This structure can reduce the distance between the magnetic conducting sleeve 23 and the moving iron 40, thereby reducing the electromagnetic force to some extent, thereby avoiding the poor hydraulic effect caused by excessive electromagnetic force.
[0046] Specifically, as shown in Figure 1 and Figure 2 , the tool withdrawal groove 27 is an annular groove formed by honing. Honing has high precision and good surface quality after processing, thereby ensuring good use effect. In addition, the tool withdrawal groove 27 is an annular groove, which can further ensure that the electromagnetic force received by the moving iron 40 is not too large, thereby producing good hydraulic effect.
[0047] As shown in Figure 1As shown, the electromagnetic proportional valve further comprises an elastic assembly 50 arranged in the limiting space 26 along the axial direction of the magnetic conducting sleeve 23, and one end of the elastic assembly 50 is connected or abuts against the magnetic conducting sleeve 23, and the other end is connected or abuts against the moving iron 40. By arranging the elastic assembly 50, the elastic force of the elastic assembly 50 can make the pilot spool 32 abut against the oil return hole 313 and form a conical seal when no electric signal is input, so as to avoid the hydraulic oil in the movable cavity 311 from flowing through the oil return hole 313, and further ensure that the main spool 31 and the main valve sleeve 24 form a conical seal, thereby avoiding leakage of the hydraulic oil.
[0048] Specifically, as shown in the figures, Figure 1 The elastic assembly 50 comprises a limiting piece 51 arranged in the magnetic conducting sleeve 23 and a first elastic piece 52, one end of the first elastic piece 52 is connected or abuts against the first limiting piece 51, and the other end is connected or abuts against the moving iron 40. Such arrangement not only simplifies the overall structure, but also enables the first elastic piece 52 to be connected or abut against the first limiting piece 51 and the moving iron 40 according to actual processing needs, thereby improving the convenience of installation.
[0049] In this embodiment, the outer periphery of the pilot spool 32 is further provided with a second elastic piece 34, one end of the second elastic piece 34 abuts against the main spool 31, and the other end abuts against the outer periphery of the pilot spool 32. When the first elastic piece 52 is compressed and the pilot spool 32 blocks the oil return hole 313, the second elastic piece 34 can balance part of the elastic force of the first elastic piece 52, thereby making the pilot spool 32 more easily open. It should be noted that the first elastic piece 52 and the second elastic piece 34 are both springs, which have simple structure, low price, good elastic effect, long service life, and are convenient to disassemble and assemble.
[0050] In addition, the moving iron 40 is provided with a receiving hole 41 along the axial direction, and at least part of the first elastic piece 52 is located in the receiving hole 41. In this structure, part of the first elastic piece 52 is located in the receiving hole 41, which can effectively limit the first elastic piece 52, and further make the first elastic piece 52 not shake during deformation, thereby ensuring good hydraulic effect.
[0051] In summary, in the electromagnetic proportional valve of the present embodiment, the size of the electromagnetic force does not change with the movement of the moving iron 40, thereby producing good hydraulic effect.
[0052] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.
Claims
1. An electromagnetic proportional valve characterized by comprising: The application relates to an electromagnetic proportional valve. The electromagnetic proportional valve comprises: an electromagnet assembly (10); a hydraulic mechanism, which comprises: a valve sleeve assembly (20) arranged at least partially in the electromagnet assembly (10) in an axial direction, and the valve sleeve assembly (20) is provided with an oil inlet (21) and an oil return port (22), and the part of the valve sleeve assembly (20) located in the electromagnet assembly (10) is provided with a brazing seam (25); a valve core assembly (30) comprising a main valve core (31) and a pilot valve core (32), the main valve core (31) is movably arranged in the valve sleeve assembly (20), the main valve core (31) is internally provided with a movable cavity (311), and the main valve core (31) is further provided with an oil inlet hole (312) and an oil return hole (313) respectively communicating with the oil inlet (21) and the oil return port (22), and the pilot valve core (32) is movably arranged in the movable cavity (311); 2. The electromagnetic proportional valve according to claim 1, characterized in that a moving iron (40) movably arranged in the valve sleeve assembly (20) in an axial direction, one end of the moving iron (40) is connected with the pilot valve core (32), and the electromagnet assembly (10) can drive the moving iron (40) to drive the pilot valve core (32) to move in an axial direction, so as to open or close the oil return hole (313).
3. The electromagnetic proportional valve according to claim 2, characterized in that The valve sleeve assembly (20) comprises a magnetic conducting sleeve (23) and a main valve sleeve (24) connected with each other, the oil inlet (21) and the oil return port (22) are arranged in the main valve sleeve (24), the magnetic conducting sleeve (23) is arranged with a limiting space (26) in an axial direction, the moving iron (40) is movably arranged in the limiting space (26) and is in sliding guiding cooperation with the magnetic conducting sleeve (23), and the brazing seam (25) is arranged along the circumference of the magnetic conducting sleeve (23).
4. The electromagnetic proportional valve according to claim 2, characterized in that The magnetic conducting sleeve (23) is provided with a welding groove in communication with the limiting space (26) in a circumferential direction, and molten copper liquid can be filled into the welding groove to solidify and form the brazing seam (25).
5. The electromagnetic proportional valve according to claim 4, characterized in that The junction of the brazing seam (25) and the limiting space (26) is provided with a tool withdrawal groove (27) in an axial direction, and the tool withdrawal groove (27) is in communication with the limiting space (26).
6. The electromagnetic proportional valve according to claim 2, characterized in that The tool withdrawal groove (27) is an annular groove processed by honing.
7. The electromagnetic proportional valve according to claim 6, characterized in that The electromagnetic proportional valve further comprises an elastic assembly (50), the elastic assembly (50) is arranged in the limiting space (26) along the axial direction of the magnetic conducting sleeve (23), one end of the elastic assembly (50) is connected with or abuts against the magnetic conducting sleeve (23), and the other end of the elastic assembly (50) is connected with or abuts against the moving iron (40).
8. The electromagnetic proportional valve according to claim 7, characterized in that The elastic assembly (50) comprises a limiting piece (51) and a first elastic piece (52), the limiting piece (51) is arranged on the magnetic conducting sleeve (23), one end of the first elastic piece (52) is connected with or abuts against the limiting piece (51), and the other end of the first elastic piece (52) is connected with or abuts against the moving iron (40). The moving iron (40) is provided with a containing hole (41) in an axial direction, and at least part of the first elastic piece (52) is located in the containing hole (41).
9. The electromagnetic proportional valve according to claim 2, characterized in that The main valve core (31) can form a taper seal with the main valve sleeve (24), and the pilot valve core (32) can form a taper seal with the oil return hole (313).
10. The electromagnetic proportional valve according to any one of claims 1 to 9, characterized in that The diameter of the oil return hole (313) gradually increases in the direction close to the oil return port (22).