Oil way proportional valve with clamping stagnation preventing function

Abstract

The utility model provides an oil way proportional valve with a clamping stagnation preventing function, relates to the technical field of proportional valves, and aims to solve the technical problem that a proportional valve in the prior art is prone to clamping stagnation. An oil way proportional valve with a clamping stagnation preventing function comprises a shell, a magnet yoke, a magnetic conductive plate, a first elastic piece, a second elastic piece and a movable iron core assembly, the magnet yoke is arranged in the shell, and a mounting cavity is formed in the magnet yoke; the magnetic conductive plate is arranged in the mounting cavity and is provided with a first mounting hole; the first elastic sheet is connected in the magnetic conductive plate and is provided with a first through hole; the second elastic sheet is connected in the magnet yoke and is provided with a second through hole which is coaxial with the first through hole; the upper end and the lower end of the movable iron core assembly are connected into the first through hole and the second through hole respectively. At least one part of the movable iron core assembly is located in the first mounting hole, and a gap is formed between the movable iron core assembly and the inner wall of the first mounting hole.

Description

Technical Field

[0001] This utility model relates to the field of proportional valve technology, specifically to an oil circuit proportional valve with anti-jamming function. Background Technology

[0002] The proportional valve in the hydraulic circuit is the core control element in the hydraulic system. Its basic function is to convert the input electrical signal into force or displacement proportionally, continuously and accurately, so as to continuously control parameters such as pressure and flow.

[0003] Chinese patent CN213954228U discloses a digital proportional valve for damping force adjustment control of a shock absorber, including a magnetic yoke assembly, a coil assembly, an armature push rod assembly, and a pilot valve spring. The armature push rod assembly and the coil assembly are disposed inside the magnetic yoke assembly, and the armature push rod assembly and the magnetic yoke assembly are slidably fitted together. The coil assembly is fixedly installed inside the magnetic yoke assembly by a nut and is sleeved on the armature push rod assembly. When the coil assembly is energized, it can push the armature push rod assembly to move along the axial direction of the magnetic yoke assembly. A stop seat is provided between the armature push rod assembly and the magnetic yoke assembly, and the pilot valve spring is disposed between the stop seat and the armature push rod assembly to provide a restoring force for the armature push rod assembly to return to its initial position. That is, when the coil assembly is de-energized, the electromagnetic force of the coil assembly on the armature push rod assembly disappears, and the pilot valve spring pushes the armature push rod assembly to move in the opposite direction back to its initial position.

[0004] In this type of proportional valve, a sliding fit is required between the armature push rod assembly and the magnetic yoke assembly, inevitably resulting in a gap between them. However, to maintain the alignment of the armature push rod assembly, this gap cannot be too large, otherwise it will cause radial displacement of the armature push rod assembly. Therefore, if a foreign object enters the tiny gap between the armature push rod assembly and the magnetic yoke assembly, it can easily cause jamming.

[0005] In addition, the hydraulic oil in a proportional valve is generally non-conductive, but hydraulic oil mixed with foreign matter poses a risk of leakage. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an oil circuit proportional valve with anti-jamming function, so as to solve the technical problem that proportional valves in the prior art are prone to jamming.

[0007] To solve the above-mentioned technical problems, this utility model provides an oil circuit proportional valve with anti-jamming function, comprising:

[0008] shell;

[0009] The magnetic yoke is located inside the outer casing and has a mounting cavity inside;

[0010] A magnetic guide plate is disposed in the mounting cavity and has a first mounting hole;

[0011] The first spring is connected inside the magnetic plate and has a first through hole;

[0012] The second spring piece is connected inside the magnetic yoke and has a second through hole that is coaxially arranged with the first through hole;

[0013] The moving iron core assembly has its upper and lower ends connected to the first through hole and the second through hole, respectively. At least a portion of the moving iron core assembly is located in the first mounting hole and has a gap between it and the inner wall of the first mounting hole.

[0014] With the above structure, the oil circuit proportional valve with anti-jamming function of this utility model has the following advantages: the moving iron core assembly is fixed by the first spring and the second spring. The first through hole of the first spring and the second through hole of the second spring are coaxially arranged, which enables the moving iron core assembly to be set vertically. Moreover, the elastic first spring and the second spring can keep the moving iron core assembly aligned. After the moving iron core assembly moves vertically, the first spring and the second spring can also play a role in automatically resetting the moving iron core assembly. Therefore, a large gap can be set between the moving iron core assembly and the inner wall of the first mounting hole, and even between it and other structures in the proportional valve, to prevent jamming when the moving iron core assembly moves vertically.

[0015] As an improvement, the upper end of the magnetic guide plate is provided with a first positioning hole, the first spring is connected to the bottom end of the first positioning hole and the first positioning hole radially limits the first spring, and an upper pressure plate is connected inside the first positioning hole and abuts against the top of the first spring; with this structure, the first positioning hole radially limits the first spring, and the upper pressure plate axially fixes the first spring, preventing the displacement of the first spring from causing the position of the moving iron core assembly to shift.

[0016] As an improvement, the first mounting hole passes through the magnetic guide plate axially and is located below the first positioning hole. The upper end of the moving iron core assembly is provided with a protrusion. A limiting block and a limiting rubber block are sequentially fitted on the protrusion from top to bottom. The limiting block and the limiting rubber block abut against the upper and lower ends of the first spring piece, respectively. This structure improves the stability of the connection between the first spring piece and the moving iron core assembly. After the moving iron core assembly moves vertically, the limiting block and the limiting rubber block cause the first spring piece to deform.

[0017] As an improvement, a second positioning hole is provided at the bottom of the magnetic yoke. The second spring is connected to the top of the second positioning hole and is radially limited by the second positioning hole. A lower pressure plate is connected inside the second positioning hole and abuts against the bottom of the second spring. With this structure, the second spring is radially limited by the second positioning hole and axially fixed by the lower pressure plate to prevent the position of the moving iron core assembly from shifting due to the displacement of the second spring.

[0018] As an improvement, the second positioning hole is located below the mounting cavity. The moving iron core assembly includes a moving iron core body and a pin arranged coaxially. A part of the moving iron core body is located in the first mounting hole and has a gap between it and the inner wall of the first mounting hole. The pin is connected to the bottom end of the moving iron core body. The mounting cavity passes through the yoke along the axial direction, so that the pin protrudes from the lower end of the mounting cavity and is located below the mounting cavity. The pin includes an expanded diameter part and a reduced diameter part located at the lower end of the expanded diameter part. The reduced diameter part is connected in the second through hole. An adapter sleeve is sleeved on the reduced diameter part. The bottom end of the expanded diameter part and the top end of the adapter sleeve abut against the upper and lower ends of the second spring piece, respectively. With this structure, the stability of the connection between the second spring piece and the moving iron core assembly is improved. After the moving iron core assembly moves vertically, the expanded diameter part and the adapter sleeve cause the second spring piece to deform.

[0019] As an improvement, this utility model also includes a plug, with an opening at the upper end of the outer shell, the plug being connected to the opening, and a first sealing ring being provided between the outer peripheral wall of the plug and the inner peripheral wall of the opening; this structure improves the sealing performance between the plug and the outer shell, prevents foreign matter from mixing into the hydraulic oil, and reduces the risk of electric leakage.

[0020] As an improvement, a coil assembly is also provided inside the mounting cavity. The top of the coil assembly has two annular walls, each annular wall forming a second mounting hole. A solenoid valve pin is connected to each second mounting hole. A second sealing ring is provided between the top of each annular wall and the plug. The plug has two plug pins corresponding to the two solenoid valve pins respectively. This structure improves the sealing performance between the annular wall and the plug, prevents foreign matter from mixing into the hydraulic oil, and reduces the risk of leakage.

[0021] As an improvement, both the first and second springs include two arc-shaped portions and four bent strips. The two arc-shaped portions are arranged left and right, with one end of two bent strips located inside one of the arc-shaped portions and one end of the other two bent strips located inside the other arc-shaped portion. The other ends of each bent strip are joined together to form a central portion. A first through hole / second through hole is located on the central portion, and the four bent strips are arranged circumferentially around the first through hole / second through hole. With this structure, the first through hole / second through hole is located on the central portion formed by the other ends of the four bent strips, which is beneficial for the elastic deformation of the first and second springs and improves the stability of the first and second springs in centering, fixing, and resetting the moving iron core assembly.

[0022] As an improvement, the gap between the moving iron core assembly and the inner wall of the first mounting hole is 0.1-0.2mm; this structure avoids the gap being too large and affecting the electromagnetic force. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the outer shell portion of this utility model.

[0024] Figure 2 for Figure 1 A magnified view of part A in the middle.

[0025] Figure 3 for Figure 1 A magnified view of part B in the middle.

[0026] Figure 4 This is an exploded structural diagram of part of this utility model.

[0027] Figure 5 This is a schematic diagram of the structure of the first spring in this utility model.

[0028] Figure 6 This is a cross-sectional view of the present invention.

[0029] Reference numerals: 1. Outer shell; 2. Magnetic yoke; 3. Mounting cavity; 4. Magnetic guide plate; 5. First mounting hole; 6. First spring; 7. First through hole; 8. Second spring; 9. Second through hole; 10. Moving iron core assembly; 101. Moving iron core body; 102. Pin; 1021. Expanded diameter section; 1022. Reduced diameter section; 11. First positioning hole; 12. Upper pressure plate; 13. Protrusion; 14. Limiting block; 15. Limiting rubber block; 16. Second positioning hole; 17. Lower pressure plate; 18. Adapter sleeve; 19. Plug; 20. First sealing ring; 21. Coil assembly; 22. Annular wall; 23. Second mounting hole; 24. Solenoid valve pin; 25. Second sealing ring; 26. Plug pin; 27. Arc-shaped section; 28. Bend; 29. ​​Center section. Detailed Implementation

[0030] The following is a detailed description of an oil circuit proportional valve with anti-jamming function according to the present invention, with reference to the accompanying drawings.

[0031] like Figures 1 to 6 As shown, an oil circuit proportional valve with anti-jamming function includes a housing 1, a magnetic yoke 2, a magnetic guide plate 4, a first spring 6, a second spring 8, and a moving iron core assembly 10. The magnetic yoke 2 is disposed inside the housing 1 and has a mounting cavity 3. The magnetic guide plate 4 is disposed inside the mounting cavity 3 and has a first mounting hole 5. In this embodiment, the magnetic guide plate 4 is press-fitted into the mounting cavity 3. The first spring 6 is connected to the magnetic guide plate 4 and has a first through hole 7. The second spring 8 is connected to the magnetic yoke 2 and has a second through hole 9 coaxially arranged with the first through hole 7. The upper and lower ends of the moving iron core assembly 10 are respectively connected to the first through hole 7 and the second through hole 9. At least a part of the moving iron core assembly 10 is located in the first mounting hole 5 and has a gap between it and the inner wall of the first mounting hole 5.

[0032] like Figure 1 and Figure 4 As shown, the upper end of the magnetic plate 4 is provided with a first positioning hole 11, the first spring piece 6 is connected to the bottom end of the first positioning hole 11 and the first positioning hole 11 radially limits the first spring piece 6, and an upper pressure plate 12 is connected inside the first positioning hole 11 and abuts against the top of the first spring piece 6.

[0033] like Figure 1 and Figure 3 As shown, the bottom end of the magnetic yoke 2 is provided with a second positioning hole 16, the second spring piece 8 is connected to the top of the second positioning hole 16 and the second positioning hole 16 radially limits the second spring piece 8, and a lower pressure plate 17 is connected inside the second positioning hole 16 and abuts against the bottom of the second spring piece 8.

[0034] The size of the first positioning hole 11 matches the size of the first spring piece 6. Similarly, the size of the second positioning hole 16 matches the size of the second spring piece 8. The upper pressure plate 12 and the lower pressure plate 17 are both annular pressure plates, which can be connected to the first positioning hole 11 and the second positioning hole 16 respectively by interference fit.

[0035] like Figure 5 As shown, the first spring 6 and the second spring 8 each include two arc-shaped portions 27 and four bent strips 28. The two arc-shaped portions 27 are arranged left and right. One end of two bent strips 28 is located inside one of the arc-shaped portions 27, and one end of the other two bent strips 28 is located inside the other arc-shaped portion 27. The other ends of each bent strip 28 are joined together to form a central portion 29. A first through hole 7 and a second through hole 9 are provided on the central portion 29, and the four bent strips 28 are arranged circumferentially around the first through hole 7 and the second through hole 9.

[0036] Among them, all four curved strips 28 are S-shaped strip structures. For two curved strips 28 connected to the same arc-shaped part 27, one end of these two curved strips 28 is perpendicular to each other, and the other end is also perpendicular to each other. For specific structure reference, see below. Figure 5 The structure of the first spring 6 and the second spring 8 shown is the same as that of the first spring 6. In addition, the two arc-shaped portions 27 are used to connect with the first positioning hole 11 / second positioning hole 16. The outer diameter of the arc-shaped portion 27 is the outer diameter of the first spring 6 / second spring 8. The gap between the arc-shaped portion 27 and the first positioning hole 11 / second positioning hole 16 should be as small as possible to ensure that the moving iron core assembly 10 is aligned.

[0037] like Figure 1 and Figure 2 As shown, the first mounting hole 5 passes through the magnetic guide plate 4 along the axial direction and is located below the first positioning hole 11. The upper end of the moving iron core assembly 10 is provided with a protrusion 13. The protrusion 13 is fitted with a limiting block 14 and a limiting rubber block 15 from top to bottom. The limiting block 14 and the limiting rubber block 15 abut against the upper and lower ends of the first spring piece 6, respectively.

[0038] like Figure 1As shown, the second positioning hole 16 is located below the mounting cavity 3. The moving iron core assembly 10 includes a moving iron core body 101 and a pin 102 arranged coaxially. A part of the moving iron core body 101 is located in the first mounting hole 5 and has a gap between it and the inner wall of the first mounting hole 5. The pin 102 is connected to the bottom end of the moving iron core body 101. The mounting cavity 3 passes through the magnetic yoke 2 along the axial direction so that the pin 102 protrudes from the lower end of the mounting cavity 3 and is located below the mounting cavity 3. The pin 102 includes an expanded diameter portion 1021 and a reduced diameter portion 1022 provided at the lower end of the expanded diameter portion 1021. The reduced diameter portion 1022 is connected in the second through hole 9. An adapter sleeve 18 is sleeved on the reduced diameter portion 1022. The bottom end of the expanded diameter portion 1021 and the top end of the adapter sleeve 18 abut against the upper and lower ends of the second spring piece 8, respectively.

[0039] The present invention also includes a plug 19, with an opening at the upper end of the outer shell 1, the plug 19 being connected to the opening, and a first sealing ring 20 being provided between the outer peripheral wall of the plug 19 and the inner peripheral wall of the opening.

[0040] like Figure 1 and Figure 4 As shown, the mounting cavity 3 is also provided with a coil assembly 21. The top of the coil assembly 21 is provided with two annular walls 22. The top of the magnetic yoke 2 is provided with clearance holes on both sides to allow the two annular walls 22 to extend out. Similarly, the magnetic guide plate 4 is also provided with clearance holes on both sides to accommodate the two annular walls 22. The magnetic guide plate 4 is located between the two annular walls 22, while the lower half of the moving iron core body 101 is located inside the coil assembly 21. Each annular wall 22 surrounds to form a second mounting hole 23. Each second mounting hole 23 is connected to a solenoid valve pin 24. A second sealing ring 25 is provided between the top of each annular wall 22 and the plug 19. The plug 19 is provided with two plug pins 26 that correspond to the two solenoid valve pins 24 respectively.

[0041] The moving iron core assembly 10 is fixed by the first spring 6 and the second spring 8. The first through hole 7 of the first spring 6 and the second through hole 9 of the second spring 8 are coaxially arranged, which allows the moving iron core assembly 10 to be set vertically. The elastic first spring 6 and the second spring 8 can keep the moving iron core assembly 10 centered. After the moving iron core assembly 10 moves vertically, the first spring 6 and the second spring 8 can also play a role in automatically resetting the moving iron core assembly 10. Therefore, a large gap can be set between the moving iron core assembly 10 and the inner wall of the first mounting hole 5, and even between it and other structures in the proportional valve, to prevent the moving iron core assembly 10 from getting stuck when it moves vertically.

[0042] For example, such as Figure 1As shown, in this embodiment, the moving iron core body 101 is located from top to bottom in the first mounting hole 5 of the magnetic guide plate 4 and in the inner hole of the coil assembly 21. The gap between the moving iron core body 101 and the inner hole of the coil assembly 21 can be larger, while the gap between the moving iron core assembly 10 and the inner wall of the first mounting hole 5 is in the range of 0.1-0.2mm, so as to avoid the gap being too large and affecting the electromagnetic force.

[0043] The first sealing ring 20 and the second sealing ring 25 prevent foreign objects from entering the hydraulic oil, reducing the risk of leakage. They also prevent foreign objects from entering the outer periphery of the moving iron core assembly 10 and causing the moving iron core assembly 10 to jam.

[0044] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiment. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A proportional valve for oil circuits with anti-jamming function, characterized in that, include: Outer shell (1); A magnetic yoke (2) is disposed inside the outer shell (1) and the magnetic yoke (2) is provided with a mounting cavity (3); A magnetic guide plate (4) is disposed in the mounting cavity (3) and has a first mounting hole (5); The first spring piece (6) is connected inside the magnetic plate (4) and has a first through hole (7); The second spring (8) is connected inside the magnetic yoke (2) and has a second through hole (9) coaxially arranged with the first through hole (7); The moving iron core assembly (10) has its upper and lower ends connected to the first through hole (7) and the second through hole (9) respectively. At least a portion of the moving iron core assembly (10) is located in the first mounting hole (5) and has a gap between it and the inner wall of the first mounting hole (5).

2. The proportional valve with anti-jamming function according to claim 1, characterized in that, The magnetic plate (4) has a first positioning hole (11) at its upper end. The first spring piece (6) is connected to the bottom end of the first positioning hole (11) and is radially limited by the first positioning hole (11). An upper pressure plate (12) is connected inside the first positioning hole (11) and abuts against the top of the first spring piece (6).

3. The proportional valve with anti-jamming function according to claim 2, characterized in that, The first mounting hole (5) passes through the magnetic guide plate (4) along the axial direction and is located below the first positioning hole (11). The upper end of the moving iron core assembly (10) is provided with a protrusion (13). A limiting block (14) and a limiting rubber block (15) are sequentially sleeved on the protrusion (13) from top to bottom. The limiting block (14) and the limiting rubber block (15) abut against the upper and lower ends of the first spring piece (6) respectively.

4. The proportional valve with anti-jamming function according to claim 1, characterized in that, The bottom end of the magnetic yoke (2) is provided with a second positioning hole (16), the second spring piece (8) is connected to the top end of the second positioning hole (16) and the second positioning hole (16) radially limits the second spring piece (8), and a lower pressure plate (17) is connected inside the second positioning hole (16) and abuts against the bottom of the second spring piece (8).

5. The proportional valve with anti-jamming function according to claim 4, characterized in that, The second positioning hole (16) is located below the mounting cavity (3). The moving iron core assembly (10) includes a moving iron core body (101) and a pin (102) arranged coaxially. A portion of the moving iron core body (101) is located inside the first mounting hole (5) and has a gap between it and the inner wall of the first mounting hole (5). The pin (102) is connected to the bottom end of the moving iron core body (101). The mounting cavity (3) passes through the magnetic yoke (2) axially, so that the pin (102) is connected to the bottom end of the moving iron core body (101). 2) The pin (102) protrudes from the lower end of the mounting cavity (3) and is located below the mounting cavity (3). The pin (102) includes an enlarged diameter portion (1021) and a reduced diameter portion (1022) located at the lower end of the enlarged diameter portion (1021). The reduced diameter portion (1022) is connected in the second through hole (9). An adapter sleeve (18) is sleeved on the reduced diameter portion (1022). The bottom end of the enlarged diameter portion (1021) and the top end of the adapter sleeve (18) abut against the upper and lower ends of the second spring piece (8), respectively.

6. The proportional valve with anti-jamming function according to claim 1, characterized in that, It also includes a plug (19), the upper end of the outer shell (1) is provided with an opening, the plug (19) is connected in the opening, and a first sealing ring (20) is provided between the outer peripheral wall of the plug (19) and the inner peripheral wall of the opening.

7. The proportional valve with anti-jamming function according to claim 6, characterized in that, The mounting cavity (3) is also provided with a coil assembly (21). The top of the coil assembly (21) is provided with two annular walls (22). Each annular wall (22) forms a second mounting hole (23). Each second mounting hole (23) is connected to a solenoid valve pin (24). A second sealing ring (25) is provided between the top of each annular wall (22) and the plug (19). The plug (19) is provided with two plug pins (26) that correspond to the two solenoid valve pins (24).

8. The proportional valve with anti-jamming function according to claim 1, characterized in that, Both the first spring (6) and the second spring (8) include two arc-shaped portions (27) and four curved strips (28). The two arc-shaped portions (27) are arranged left and right. One end of two curved strips (28) is located inside one of the arc-shaped portions (27), and one end of the other two curved strips (28) is located inside the other arc-shaped portion (27). The other end of each curved strip (28) is joined together to form a central portion (29). The first through hole (7) / the second through hole (9) is located on the central portion (29), and the four curved strips (28) are arranged circumferentially around the first through hole (7) / the second through hole (9).

9. The proportional valve with anti-jamming function according to claim 1, characterized in that, The gap between the moving iron core assembly (10) and the inner wall of the first mounting hole (5) is in the range of 0.1-0.2 mm.

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