Electromagnetic valve
By designing multiple interference surfaces on the static iron core to cooperate with the installation cavity of the outer pipe, the problem of difficulty in assembling the static iron core and pipe fittings is solved, and convenient installation and safe assembly of the static iron core and outer pipe is achieved.
Patent Information
- Application Number
- CN202421395926.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-06-19
AI Technical Summary
In existing solenoid valves, it is difficult to assemble the static iron core and the pipe fittings, and due to the deformation and fluctuation of the pipe fittings, the interference volume increases, which easily leads to damage to the pipe fittings.
A solenoid valve is designed, wherein a plurality of interference surfaces are provided along the circumferential direction on the outer peripheral wall of the static iron core, including a first interference surface, a second interference surface and a third interference surface, respectively, and the installation cavity of the outer tube. In the interference coordination, the moving iron core slid vertically and is connected to the outer tube, and the moving iron core is driven by the static iron core.
Through the coordination of multiple interference surfaces, the installation of the static iron core and the outer pipe is more convenient, avoiding damage to the outer pipe and the interference surface with a larger interference quantity, and improving the convenience and safety of assembly.
Smart Images
Figure CN222502870U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electromagnetic valves, in particular to a electromagnetic valve. Background Art
[0002] The solenoid valve is used to control and regulate the fluid medium, mainly used to control the on and off of the flow of the fluid. Common solenoid valves include valve seats, pistons, valve cover assemblies, return springs, moving iron cores, static iron cores, coil assemblies, etc. The solenoid valve takes in air from the side holes of the valve seat and exhausts air from the lower end holes. When the coil assembly is energized, the static iron core generates a magnetic field, driving the moving iron core to move. The moving iron core drives the sealing gasket to block the pressure relief hole to form high pressure. The high pressure causes the valve core to move downward to block the air outlet, disconnecting the air inlet from the air outlet. After the power is turned off, the return spring causes the moving iron core to rise, driving the sealing gasket to leave the pressure relief hole, the high pressure disappears, the valve core moves upward, and the air inlet and the air outlet are reconnected. Among them, the static iron core needs to have an interference fit with the pipe fittings. Sometimes the interference between the static iron core and the pipe fittings is large, which makes assembly more difficult. Moreover, since the pipe fittings involve brazing processes, there are slight deformations after completion, and the size fluctuates greatly. When the interference fit with the static iron core is also easy to cause further increase in the interference, causing damage to the pipe fittings. Utility Model Content
[0003] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a solenoid valve to solve the technical problem of the difficulty in assembling the static iron core and the pipe fitting in the prior art.
[0004] In order to solve the above technical problems, the utility model provides a solenoid valve, including a moving iron core, a stationary iron core and an outer tube, an installation cavity is provided at the bottom end of the outer tube, a first interference surface and a second interference surface are provided on the outer peripheral wall of the stationary iron core in a circumferential direction, the first interference surface is located below the second interference surface, the outer diameter of the first interference surface is larger than the outer diameter of the second interference surface, the second interference surface and the first interference surface are both interference fit with the installation cavity, the moving iron core is vertically slidably connected in the outer tube and is driven to move by the stationary iron core.
[0005] After adopting the above structure, the solenoid valve of the utility model has the following advantages: the static iron core and the outer tube are still interference fit, wherein the first interference surface and the installation cavity of the outer tube maintain the required interference amount; during installation, the static iron core is pressed into the installation cavity from bottom to top, and the second interference surface first has interference fit with the installation cavity; since the outer diameter of the second interference surface is smaller than the first interference surface, the second interference surface is easier to have interference fit with the installation cavity than the first interference surface; therefore, the second interference surface can slightly open the installation cavity for the first interference surface, facilitating the interference fit between the installation cavity and the first interference surface, making the installation of the static iron core and the outer tube more convenient; and the setting of the second interference surface can also prevent the outer tube from being damaged by directly fitting with the first interference surface having a larger interference amount.
[0006] As an improvement, a third interference surface is provided on the outer wall of the static iron core along the circumferential direction, the third interference surface is located above the second interference surface, the outer diameter of the third interference surface is smaller than the outer diameter of the second interference surface, and the third interference surface is interference fit with the installation cavity; with this structure, a third interference surface is further provided on the basis of the second interference surface, which makes the installation of the static iron core and the outer tube more convenient and further prevents damage to the outer tube.
[0007] As an improvement, the static iron core includes a connecting part and a limiting part, the connecting part and the limiting part are coaxially arranged, the connecting part is connected to the top end of the limiting part, the outer diameter of the limiting part is larger than the outer diameter of the connecting part, the first interference surface and the second interference surface are both arranged on the connecting part, the connecting part is located in the installation cavity, and the upper end surface of the limiting part is abutted against the bottom end of the outer tube; with this structure, the static iron core is limited by the limiting part to prevent the static iron core from being pressed too deeply into the outer tube.
[0008] As an improvement, the utility model also includes a valve seat, a valve core, a valve cover, a valve needle, a first spring and a first sealing gasket. The moving iron core is located above the static iron core, the bottom end of the static iron core is exposed below the installation cavity and is connected to the top of the valve seat, the upper end of the valve needle is connected to the moving iron core, the lower end of the valve needle passes through the static iron core and is connected to the first sealing gasket, the first spring is connected between the moving iron core and the static iron core, an accommodating cavity is provided in the valve seat, the valve cover is connected in the accommodating cavity, the valve core is vertically movably connected to the bottom end of the valve cover, an air inlet is provided on the side wall of the valve seat, an air outlet is provided at the bottom end of the valve seat, the air inlet and the air outlet are both connected to the accommodating cavity, and a cavity located in the valve seat is formed. The air cavity above the valve cover, the top of the valve seat is provided with a pressure relief hole, the bottom of the pressure relief hole is connected to the air cavity, the first sealing gasket is used to seal the upper end of the pressure relief hole, when the valve core is against the bottom of the accommodating cavity, the valve core disconnects the air inlet and the air outlet; after the static iron core is energized, it drives the moving iron core and the valve needle to move downward, and the pressure relief hole is sealed by the first sealing gasket, and high pressure is formed in the air cavity, causing the valve core to move downward and disconnect the air inlet and the air outlet. After power is off, the first spring causes the moving iron core and the valve needle to move upward, the first sealing gasket leaves the pressure relief hole, the air cavity is depressurized to form a low-pressure area, the valve core moves upward, and the air inlet and the air outlet are connected again.
[0009] As an improvement, the upper end of the valve needle is inserted into the bottom end of the moving iron core; compared with the existing connection method between the valve needle and the moving iron core, this structure saves a spring and reduces costs.
[0010] As an improvement, the first sealing gasket is embedded in the bottom end of the valve needle, and a mounting hole located above the first sealing gasket is provided in the valve needle. A compressed second spring is connected in the mounting hole, and the upper end of the second spring abuts against the upper end of the mounting hole, and the lower end of the second spring abuts against the upper end of the first sealing gasket. With this structure, the second spring applies a downward elastic force to the first sealing gasket, so that the first sealing gasket fits better with the upper end of the pressure relief hole, thereby improving the sealing performance.
[0011] As an improvement, a third spring is connected between the valve core and the bottom end of the accommodating chamber, the bottom end of the accommodating chamber is provided with a first protrusion arranged around the air outlet, the bottom end of the accommodating chamber is circumferentially provided with a second protrusion connected to the inner wall of the accommodating chamber, an annular groove is provided on the outer circumferential wall of the valve core, the upper end of the third spring is abutted against the top of the annular groove and is located between the inner wall of the valve cover and the outer wall of the valve core, and the lower end of the third spring is abutted against the bottom end of the accommodating chamber and is located between the first protrusion and the second protrusion; with this structure, the upper end of the third spring is limited by the inner wall of the valve cover and the outer wall of the valve core, and the lower end of the third spring is limited by the first protrusion and the second protrusion, thereby preventing the third spring from moving or even deforming due to air pressure, thereby improving the service life of the third spring.
[0012] As an improvement, a second sealing gasket for abutting against the first protrusion is connected to the bottom end of the valve core; adopting this structure, the sealing effect when the valve core disconnects the air inlet and the air outlet is improved.
[0013] As a modified machine, the first interference surface has a diameter of 10.06 mm and a length of 1 mm, the second interference surface has a diameter of 10.04 mm and a length of 1.5 mm, and the third interference surface has a diameter of 10.02 mm and a length of 0.5 mm. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a cross-sectional view of the moving iron core, the stationary iron core and the outer tube in the utility model.
[0015] Figure 2 for Figure 1 A partial enlarged view of part A in the middle.
[0016] Figure 3 It is a cross-sectional view of the utility model.
[0017] Figure 4 It is a three-dimensional structural schematic diagram of the utility model.
[0018] Figure numerals: 1. moving iron core; 2. stationary iron core; 21. connecting part; 22. limiting part; 3. outer tube; 31. mounting cavity; 4. first interference surface; 5. second interference surface; 6. third interference surface; 7. valve seat; 71. accommodating cavity; 72. air cavity; 8. valve core; 9. valve cover; 10. valve needle; 11. first spring; 12. first sealing gasket; 13. air inlet; 14. air outlet; 15. pressure relief hole; 16. mounting hole; 17. second spring; 18. third spring; 19. first protrusion; 20. second protrusion; 23. annular groove; 24. second sealing gasket. DETAILED DESCRIPTION
[0019] The following is a detailed description of a solenoid valve of the utility model in conjunction with the accompanying drawings.
[0020] like Figures 1 to 4As shown, a solenoid valve comprises a moving iron core 1, a stationary iron core 2 and an outer tube 3, a mounting cavity 31 is provided at the bottom end of the outer tube 3, the cross sections of the outer tube 3 and the mounting cavity 31 are both circular, similarly, the moving iron core 1 and the stationary iron core 2 are also circular in cross section, a first interference surface 4 and a second interference surface 5 are provided on the outer peripheral wall of the stationary iron core 2 along the circumferential direction, the first interference surface 4 and the second interference surface 5 are both circumferential surfaces, the first interference surface 4 is located below the second interference surface 5, the outer diameter of the first interference surface 4 is greater than the outer diameter of the second interference surface 5, the second interference surface 5 and the first interference surface 4 are both in contact with the mounting cavity 31 interference fit, the moving iron core 1 is connected to the outer tube 3 along the vertical sliding and is driven to move by the static iron core 2; on this basis, a third interference surface 6 is circumferentially provided on the outer wall of the static iron core 2, and the third interference surface 6 is also a circular surface, and the third interference surface 6 is located above the second interference surface 5, and the outer diameter of the third interference surface 6 is smaller than the outer diameter of the second interference surface 5, and the third interference surface 6 is interference fit with the installation cavity 31; in addition, in some other embodiments, a fourth interference surface, a fifth interference surface, etc. can be further provided above the third interference surface 6 as needed.
[0021] like Figure 1 As shown, the static iron core 2 includes a connecting portion 21 and a limiting portion 22, the connecting portion 21 and the limiting portion 22 are coaxially arranged, the connecting portion 21 is connected to the top of the limiting portion 22, the outer diameter of the limiting portion 22 is larger than the outer diameter of the connecting portion 21, the first interference surface 4, the second interference surface 5 and the third interference surface 6 are all arranged on the connecting portion 21, the connecting portion 21 is located in the installation cavity 31, the upper end surface of the limiting portion 22 is against the bottom end of the outer tube 3, the moving iron core 1 is located above the static iron core 2, and the bottom end of the static iron core 2 is exposed below the installation cavity 31 and connected Connected to the top of the valve seat 7, the upper end of the valve needle 10 is connected to the moving iron core 1. Specifically, the upper end of the valve needle 10 is inserted into the bottom end of the moving iron core 1, and the lower end of the valve needle 10 passes through the static iron core 2 and is connected to the first sealing gasket 12. The first spring 11 is connected between the moving iron core 1 and the static iron core 2. The upper end of the first spring 11 is against the bottom end of the moving iron core 1, and a groove is set at the top of the static iron core 2. The first spring 11 is accommodated in the groove, and the bottom end of the first spring 11 is against the bottom end of the groove. The first spring 11 is also sleeved on the valve needle 10.
[0022] In addition, the first sealing gasket 12 is embedded in the bottom end of the valve needle 10. The valve needle 10 is provided with a mounting hole 16 located above the first sealing gasket 12. A compressed second spring 17 is connected to the mounting hole 16. The upper end of the second spring 17 abuts against the upper end of the mounting hole 16, and the lower end of the second spring 17 abuts against the upper end of the first sealing gasket 12.
[0023] like Figure 3As shown, a receiving cavity 71 is provided in the valve seat 7, the valve cover 9 is connected in the receiving cavity 71, the valve core 8 is vertically movably connected to the bottom end of the valve cover 9, an air inlet 13 is provided on the side wall of the valve seat 7, and an air outlet 14 is provided at the bottom end of the valve seat 7. Both the air inlet 13 and the air outlet 14 are communicated with the receiving cavity 71, and an air cavity 72 located above the valve cover 9 is formed in the valve seat 7. A pressure relief hole 15 is provided at the top end of the valve seat 7. The pressure relief hole 15 is vertically arranged, and the bottom end of the pressure relief hole 15 is communicated with the air cavity 72. The first sealing gasket 12 is used to block the upper end of the pressure relief hole 15. When the valve core 8 abuts against the bottom end of the receiving cavity 71, the valve core 8 allows the inlet to flow in. The air inlet 13 is disconnected from the air outlet 14; specifically, after the static iron core 2 is energized, it drives the moving iron core 1 and the valve needle 10 to move downward, and the pressure relief hole 15 is blocked by the first sealing gasket 12, and high pressure is formed in the air cavity 72 to make the valve core 8 move downward and disconnect the air inlet 13 and the air outlet 14; after power is off, the first spring 11 makes the moving iron core 1 and the valve needle 10 move upward, the first sealing gasket 12 leaves the pressure relief hole 15, the air cavity 72 releases pressure to form a low-pressure area, the valve core 8 moves upward, and the air inlet 13 is reconnected with the air outlet 14. The specific principles of the solenoid valve are all existing technologies and will not be repeated here.
[0024] like Figure 3 As shown, a third spring 18 is connected between the valve core 8 and the bottom end of the accommodating chamber 71, a first protrusion 19 arranged around the air outlet 14 is provided at the bottom end of the accommodating chamber 71, a second protrusion 20 connected to the inner wall of the accommodating chamber 71 is circumferentially provided at the bottom end of the accommodating chamber 71, an annular groove 23 is provided on the outer circumferential wall of the valve core 8, the annular groove 23 runs through the bottom end of the valve core 8, the upper end of the third spring 18 abuts against the top of the annular groove 23 and is located between the inner wall of the valve cover 9 and the outer wall of the valve core 8, the outer wall of the valve core 8 here is the outer wall of the valve core 8 where the annular groove 23 is provided, the lower end of the third spring 18 abuts against the bottom end of the accommodating chamber 71 and is located between the first protrusion 19 and the second protrusion 20; the bottom end of the valve core 8 is connected to a second sealing gasket 24 for abutting against the first protrusion 19.
[0025] The static iron core 2 and the outer tube 3 are still interference fit, wherein the first interference surface 4 and the installation cavity 31 of the outer tube 3 maintain the required interference amount. During installation, the static iron core 2 is pressed into the installation cavity 31 from bottom to top, and the third interference surface 6 is firstly interference fit with the installation cavity 31, and then the second interference surface 5 is interference fit with the installation cavity 31. Since the outer diameters of the third interference surface 6 and the second interference surface 5 are both smaller than the first interference surface 4, and the outer diameter of the third interference surface 6 is also smaller than the second interference surface 5, the third interference surface 6 is smaller than the second interference surface 5. The interference surface 5 is easier to be interference-fitted with the installation cavity 31, and the second interference surface 5 is easier to be interference-fitted with the installation cavity 31 than the first interference surface 4. Therefore, the third interference surface 6 and the second interference surface 5 can slightly open the installation cavity 31 for the first interference surface 4 in turn, which is convenient for the installation cavity 31 to be interference-fitted with the first interference surface 4, making it more convenient to install the static iron core 2 and the outer tube 3. Moreover, the setting of the third interference surface 6 and the second interference surface 5 can also prevent the outer tube 3 from being damaged by directly matching with the first interference surface 4 with a larger interference amount. Specifically, in this embodiment, the first interference surface 4 has a diameter of 10.06 mm and a length of 1 mm, the second interference surface 5 has a diameter of 10.04 mm and a length of 1.5 mm, and the third interference surface 6 has a diameter of 10.02 mm and a length of 0.5 mm. The third interference surface 6 is equivalent to playing a guiding role, and the second interference surface 5 is equivalent to playing a transition role.
[0026] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned one implementation mode, and all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present invention.
Claims
1. A solenoid valve, characterized in that: The invention comprises a moving iron core (1), a stationary iron core (2) and an outer tube (3); a mounting cavity (31) is provided at the bottom end of the outer tube (3); a first interference surface (4) and a second interference surface (5) are circumferentially provided on the outer peripheral wall of the stationary iron core (2); the first interference surface (4) is located below the second interference surface (5); the outer diameter of the first interference surface (4) is larger than the outer diameter of the second interference surface (5); the second interference surface (5) and the first interference surface (4) are both interference-fitted with the mounting cavity (31); the moving iron core (1) is vertically slidably connected in the outer tube (3) and is driven to move by the stationary iron core (2).
2. The solenoid valve according to claim 1, characterized in that: A third interference surface (6) is provided on the outer peripheral wall of the static iron core (2) along the circumferential direction. The third interference surface (6) is located above the second interference surface (5). The outer diameter of the third interference surface (6) is smaller than the outer diameter of the second interference surface (5). The third interference surface (6) is interference-fitted with the mounting cavity (31).
3. The solenoid valve according to claim 1, characterized in that: The static iron core (2) comprises a connecting portion (21) and a limiting portion (22); the connecting portion (21) and the limiting portion (22) are coaxially arranged; the connecting portion (21) is connected to the top end of the limiting portion (22); the outer diameter of the limiting portion (22) is greater than the outer diameter of the connecting portion (21); the first interference surface (4) and the second interference surface (5) are both arranged on the connecting portion (21); the connecting portion (21) is located in the mounting cavity (31); and the upper end surface of the limiting portion (22) abuts against the bottom end of the outer tube (3).
4. The solenoid valve according to claim 1, characterized in that: It also includes a valve seat (7), a valve core (8), a valve cover (9), a valve needle (10), a first spring (11) and a first sealing gasket (12); the moving iron core (1) is located above the static iron core (2); the bottom end of the static iron core (2) is exposed below the installation cavity (31) and is connected to the top of the valve seat (7); the upper end of the valve needle (10) is connected to the moving iron core (1); the lower end of the valve needle (10) passes through the static iron core (2) and is connected to the first sealing gasket (12); the first spring (11) is connected between the moving iron core (1) and the static iron core (2); a receiving cavity (71) is provided in the valve seat (7); the valve cover (9) is connected in the receiving cavity (71); the valve core (8) is arranged along the inner wall of the valve seat (7); A vertical movable connection is provided at the bottom end of the valve cover (9); an air inlet (13) is provided on the side wall of the valve seat (7); an air outlet (14) is provided at the bottom end of the valve seat (7); both the air inlet (13) and the air outlet (14) are communicated with the accommodating cavity (71); an air cavity (72) located above the valve cover (9) is formed in the valve seat (7); a pressure relief hole (15) is provided at the top end of the valve seat (7); the bottom end of the pressure relief hole (15) is communicated with the air cavity (72); the first sealing gasket (12) is used to block the upper end of the pressure relief hole (15); when the valve core (8) abuts against the bottom end of the accommodating cavity (71), the valve core (8) disconnects the air inlet (13) from the air outlet (14).
5. The solenoid valve according to claim 4, characterized in that: The upper end of the valve needle (10) is plugged into the bottom end of the moving iron core (1).
6. The solenoid valve according to claim 4, characterized in that: The first sealing gasket (12) is embedded in the bottom end of the valve needle (10), and a mounting hole (16) located above the first sealing gasket (12) is provided in the valve needle (10), and a compressed second spring (17) is connected to the mounting hole (16), and the upper end of the second spring (17) abuts against the upper end of the mounting hole (16), and the lower end of the second spring (17) abuts against the upper end of the first sealing gasket (12).
7. The solenoid valve according to claim 4, characterized in that: A third spring (18) is connected between the valve core (8) and the bottom end of the accommodating chamber (71); a first protrusion (19) is arranged around the air outlet (14) at the bottom end of the accommodating chamber (71); a second protrusion (20) connected to the inner wall of the accommodating chamber (71) is circumferentially arranged at the bottom end of the accommodating chamber (71); an annular groove (23) is arranged on the outer peripheral wall of the valve core (8); the upper end of the third spring (18) abuts against the top of the annular groove (23) and is located between the inner wall of the valve cover (9) and the outer wall of the valve core (8); the lower end of the third spring (18) abuts against the bottom end of the accommodating chamber (71) and is located between the first protrusion (19) and the second protrusion (20).
8. The solenoid valve according to claim 7, characterized in that: The bottom end of the valve core (8) is connected to a second sealing gasket (24) for abutting against the first protrusion (19).
9. The solenoid valve according to claim 2, characterized in that: The first interference surface (4) has a diameter of 10.06 mm and a length of 1 mm, the second interference surface (5) has a diameter of 10.04 mm and a length of 1.5 mm, and the third interference surface (6) has a diameter of 10.02 mm and a length of 0.5 mm.