Valve device
The solenoid valve design addresses the issue of elastic member tilting and wear by using positioning portions and passage structures to maintain radial distance and reduce friction, enhancing stability and extending the spring's life.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- ZHEJIANG SANHUA INTELLIGENT CONTROLS CO LTD
- Filing Date
- 2024-05-21
- Publication Date
- 2026-04-30
AI Technical Summary
The existing solenoid valves face issues with the elastic member tilting and wearing due to repeated compression and restoration, leading to potential contact and wear between the elastic member and other components during operation.
The valve device incorporates a fixed core member and a movable core member with positioning portions and passage portions that restrict the elastic member's ends, maintaining a minimum radial distance of 0.5M from the passage walls, reducing friction and tilting, and using a pre-compressed spring with close-contact segments to enhance stability and reduce wear.
This design significantly reduces frictional contact and wear between the elastic member and other components, extending the spring's service life and improving the solenoid valve's reliability by preventing excessive deformation and maintaining stable operation.
Smart Images
Figure 2026513680000001_ABST
Abstract
Description
Technical Field
[0001] This application claims the priority of a Chinese patent application with an application number of 202310581544.0 and an invention title of "Valve Device", which was filed with the China Patent Office on May 22, 2023, and all of its contents are incorporated herein by reference.
[0002] The present invention relates to the technical field of electromagnetic control, specifically to valve devices.
Background Art
[0003] As a typical valve device, a solenoid valve includes a movable core unit, a fixed core member, and an elastic member. The movable core unit includes a movable core member and a piston connected to the movable core member. The elastic member is provided between the movable core member and the fixed core member. One side of the elastic member abuts against the movable core member, and the other side abuts against the fixed core. When the coil member is in the energized state, the movable core member and the fixed core member are attracted to each other, the piston moves away from the valve port, and the valve port opens. When the coil member is in the power-off state, the movable core member moves away from the fixed core member, and under the restoring force of the elastic member, the piston closes the valve port.
[0004] During the process of the movable core member reciprocating along the axial direction, the elastic member may be curved and deformed because it is repeatedly compressed and restored, and it is likely to tilt during the actual operation process, and there is also a risk of contact and wear between the elastic member and other members.
Summary of the Invention
Problems to be Solved by the Invention
[0005] The purpose of this application is to provide a valve device that improves the situation where the spring tilts during the operation process and reduces the contact wear situation between the elastic member and other members.
Means for Solving the Problems
[0006] This application provides a valve device comprising a fixed core member, a movable core member, and an elastic member between the fixed core member and the movable core member, wherein the elastic member comprises a first end and a second end, and the wire diameter of the elastic member is defined as M. The fixed core member is provided with a first passage portion and a first positioning portion, the first passage portion is recessed inward from the end face of the fixed core member, the first positioning portion is recessed or protrudes from the bottom wall of the first passage portion, the diameter of the first passage portion is larger than the diameter of the first positioning portion, the first passage portion includes a first passage wall, the first end is position-restricted to the first positioning portion, there is a predetermined distance L1 between the elastic member and the first passage wall in the radial direction, L1 ≥ 0.5M, and / or, the movable core member is provided with a second passage portion and a second positioning portion, the second passage portion is recessed inward from the end face of the movable core member, the second positioning portion is recessed or protrudes from the bottom wall of the second passage portion, the diameter of the second passage portion is larger than the diameter of the second positioning portion, the second passage portion includes a second passage wall, the second end is position-restricted to the second positioning portion, and there is a predetermined distance L2 between the elastic member and the second passage wall in the radial direction, L2 ≥ 0.5M.
[0007] Embodiments of the present invention provide a valve device in which a fixed core member is provided with a first positioning portion, the first end of an elastic member is restricted to the position of the first positioning portion, and / or a movable core is provided with a second positioning portion, the second end of an elastic member is restricted to the position of the second positioning portion, there is a predetermined distance L1 between the elastic member and the first passage wall, L1 ≥ 0.5M, and / or there is a predetermined distance L2 between the elastic member and the second passage wall, L2 ≥ 0.5M, thereby reducing the possibility of frictional contact between the elastic member and the movable core and / or fixed core while ensuring the positioning of the two ends. [Brief explanation of the drawing]
[0008] [Figure 1] This is a schematic diagram of the structure of a solenoid valve according to the first embodiment of this application. [Figure 2] This is an enlarged view of position A in Figure 1. [Figure 3] Figure 1 is a schematic diagram of the sleeve. [Figure 4] Figure 1 is a schematic diagram of the fixed core member. [Figure 5] Figure 1 is a schematic diagram of the movable core member. [Figure 6] Figure 5 is a schematic diagram of the movable core body of the movable core member. [Figure 7] Figure 5 is a schematic diagram of the sealing block of the movable core member. [Figure 8] Figure 5 is a schematic diagram of the guide ring of the movable core member. [Figure 9] This is a schematic diagram of the movable core body of the movable core member of the solenoid valve according to the second embodiment of the present invention. [Figure 10] This is a schematic diagram of the fixed core member of the solenoid valve according to the second embodiment of this application. [Modes for carrying out the invention]
[0009] To help those skilled in the art better understand the solutions of the present invention, the present invention will be described in more detail below, combining the drawings and specific embodiments.
[0010] Referring to Figures 1 and 2, Figure 1 is a schematic diagram of the structure of a solenoid valve according to the first embodiment of this application, and Figure 2 is an enlarged view of position A in Figure 1.
[0011] The embodiment provides a valve device, which is specifically a solenoid valve, and the solenoid valve will be described below as an example. The solenoid valve includes a movable core member 5 and a fixed core member 7 distributed along the axial direction of the solenoid valve, and the solenoid valve further includes a valve seat 1 provided with a valve port 12. In Figure 1, the solenoid valve is in a closed state, and the movable core member 5 is in contact with the valve port 12 of the solenoid valve so as to seal the valve port 12. In the viewing angle of Figure 1, when the solenoid valve is energized, an attractive force is generated between the fixed core member 7 and the movable core member 5, and the movable core member 5 moves upward along the axial direction of the solenoid valve, away from the valve port 12, and the valve port 12 opens.
[0012] In this embodiment, an elastic member is provided between the movable core member 5 and the fixed core member 7, the elastic member includes a first end and a second end, the wire diameter of the elastic member is defined as M, in this embodiment the elastic member is specifically a spring 6, the wire diameter represents the thickness of the spring 6 itself, for example, if the spring 6 is manufactured using steel wire, the wire diameter of the spring 6 is the diameter of the steel wire, and the diameter of the spring 6 is the diameter of the formed spiral. As can be seen from this, the elastic member may have a different structure. Also in this embodiment the spring 6 may be arranged to be pre-compressed, that is, the spring 6 is always in a compressed state, in the closed valve state the spring 6 has a certain amount of compression and provides spring force to bring the movable core member 5 into contact with the valve opening 12, when the valve is opened the movable core member 5 moves upward and continuously comes into contact with the compression spring 6, increasing the amount of compression, and when the solenoid valve fails, the spring 6 provides sufficient restoring force to move the movable core member 5 downward as quickly as possible to seal the valve opening 12.
[0013] As shown in Figure 2, the fixed core member 7 has a first end face facing the movable core member 5, and the movable core member 5 has a second end face facing the fixed core member 7. The first end face has a first passage 73 that is recessed inward from the first end face, and the second end face has a second passage 518 that is recessed inward from the second end face. Part of the spring 6 is located in the first passage 73, and the other part is located in the second passage 518. The fixed core member 7 is provided with a first positioning part, and the movable core member 5 is provided with a second positioning part. The first positioning part is located at the bottom wall 76 of the first passage 73, and the second positioning part is located at the bottom wall 519 of the second passage 518. The inner diameter of the first passage 73 is larger than the diameter of the first positioning part, and the inner diameter of the second passage 518 is larger than the diameter of the second positioning part.
[0014] Specifically, the groove of the first passage 73 faces the movable core member 5, that is, the groove faces downward, and the groove of the second passage 518 faces the fixed core member 7, that is, the groove faces upward. In this embodiment, the positioning portion is specifically a groove, and the grooves provided in the bottom wall 76 of the first passage section 73 and the bottom wall 519 of the second passage section 518 are defined as the first positioning groove 75 and the second positioning groove 517, respectively. The first positioning groove 75 is provided in the bottom wall 76 of the first passage section 73, and the second positioning groove 517 is provided in the bottom wall 519 of the second passage section 518. Both the bottom wall 76 of the first passage section 73 and the bottom wall 519 of the second passage section 518 are wall surfaces facing the respective groove openings. As shown in Figure 2, the bottom wall 76 of the first passage section 73 is the upper groove wall of the groove, and the bottom wall 519 of the second passage section 518 is the lower groove wall of the groove.
[0015] In this embodiment, the first passage portion 73 includes a first passage wall, the first passage wall is specifically the inner circle of the first passage portion 73, the first end of the elastic member is restricted to a first positioning portion, and the distance between the elastic member and the first passage wall in the radial direction is defined to be a predetermined distance L1, so that L1 ≥ 0.5M is satisfied. The second passage portion 518 includes a second passage wall, the second passage wall is specifically the inner circle of the second passage portion 518, the second end of the elastic member is restricted to a second positioning portion, and the distance between the elastic member and the second passage wall in the radial direction is defined to be a predetermined distance L2, so that L2 ≥ 0.5M is satisfied.
[0016] Here, during the compression or release process of the elastic member, its end has a distance that allows it to be displaced radially along the bottom wall of the fixed core member 7, and there is a risk that it will have a curved deformation position that is offset from the center position of the elastic member. Therefore, by setting it at L1≧0.5M and / or L2≧0.5M, the wear between the elastic member and the fixed core member 7 and / or between the elastic member and the movable core member 5 can be significantly reduced.
[0017] Thus, in this embodiment, there is a predetermined interval L1 between the elastic member and the first hole wall in the radial direction, where L1 ≥ 0.5M, and / or there is a predetermined interval L2 between the elastic member and the second hole wall in the radial direction, where L2 ≥ 0.5M. In this way, there is a predetermined interval of 0.5M or more between the elastic member and the fixed core member 7, and / or between the elastic member and the movable core member 5. Frictional contact is reduced, and the wear condition between the elastic member and the member can be reduced. However, at the same time that the interval between the elastic member and the member increases, the elastic member is more likely to twist and tilt during the operation process. Therefore, by positioning the elastic member by the first positioning portion and the second positioning portion, the phenomenon that the elastic member tilts during the operation process can be improved, the wear condition between the elastic member and the member can be significantly reduced, and tilting during the operation process can be prevented.
[0018] Also, in this embodiment, in the valve-closed state, both the first end and the second end of the pre-compressed spring 6 include a close-contact segment portion, which are defined as the first close-contact segment portion 61 and the second close-contact segment portion 62 respectively. The close-contact segment portion is always in a compressed and close-contact state. In the valve-closed state, the close-contact segment portion is compressed and in close contact, and the portion between the two close-contact segment portions is in a natural unfolded state. When the valve is opened, since the close-contact segment portion is already in a compressed and close-contact state, the state of the two close-contact segment portions does not change. As the movable core member 5 gradually moves upward, the portion between the two close-contact segment portions begins to be compressed.
[0019] At this time, one end of the spring 6 is inserted into the first hole passage portion 73 and also inserted into the first positioning concave groove 75. Here, a stepped groove is formed on the first end face. The small-diameter portion of the stepped groove is the first positioning concave groove 75, and the large-diameter portion of the stepped groove is the first hole passage portion 73. The close contact segment portion of this end of the spring 6 is inserted into the first positioning concave groove 75. As shown in FIG. 2, the close contact segment portion at the upper end of the spring 6 is inserted into the first positioning concave groove 75 and abuts against the bottom wall 74 of the first positioning concave groove 75. The close contact segment portion at the upper end of the spring 6 is defined as the first close contact segment portion 61. Correspondingly, the other end of the spring 6 is inserted into the second hole passage portion 518 and also inserted into the second positioning concave groove 517 and abuts against the bottom wall 511 of the second positioning concave groove 517. Here, a stepped groove is formed on the second end face of the movable core member 5. The small-diameter portion of the stepped groove is the second positioning concave groove 517, and the large-diameter portion of the stepped groove is the second hole passage portion 518. The close contact segment portion of this end of the spring 6 is inserted into the second positioning concave groove 517. As shown in FIG. 2, the close contact segment portion at the upper end of the spring 6 is inserted into the second positioning concave groove 517 and abuts against the bottom wall 511 of the second positioning concave groove 517. The close contact segment portion of this end is defined as the second close contact segment portion 62.
[0020] The first close contact segment portion 61 and the side wall of the first positioning concave groove 75 are clearance-fitted. The side wall is the inner circle of the first positioning concave groove 75. As shown in FIG. 2, the diameter of the first positioning concave groove 75 is D4. The second close contact segment portion 62 and the side wall of the second positioning concave groove 517 are clearance-fitted. The side wall is the inner circle of the second positioning concave groove 517. Regarding the clearance fit described in the present application, in order to achieve the purpose of positioning, there is a small gap between the first close contact segment portion 61 and the side wall of the first positioning concave groove 75. However, different from the intermediate fit and interference fit, the gap does not require the first close contact segment portion 61 to receive a certain pressure and permits the first close contact segment portion 61 to be inserted into the first positioning concave groove 75. For example, the gap is 0.1 mm or less. The engagement relationship between the second close contact segment portion 62 and the second positioning concave groove 517 is also a clearance fit, and the gap is also 0.1 mm or less.
[0021] As shown in Figure 2, the diameter of the spring 6 is D3, the diameter of the first passage 73 and the second passage 518 is D5, and the diameter of the first positioning groove 75 and the second positioning groove 517 are both D4. D4 is slightly larger than D3 to form a clearance fit, for example, the difference S1 between D4 and D3 satisfies S1 ≤ 0.1 mm, and D5 is larger than D3 and D4, that is, the diameter of the first passage 73 and the second passage 518 is D5, and the difference from the diameter of the spring 6 is larger, so that space can be reserved for the deformation of the spring 6. With this arrangement, the first contact segment 61 and the second contact segment 62 are fitted in a gap with the corresponding positioning part, so they do not deform, their outer diameter does not change, and there is no friction with the positioning part, while maintaining the stability of the spring 6. When the movable core member 5 of the solenoid valve approaches the fixed core member 7 and further compresses the spring 6, the outer diameter of the part of the spring 6 between the two contact segments increases and may bend or deform. However, the hole diameters of the first passage 73 and the second passage 518 are large, making friction with the movable core member 5 or the fixed core member 7 less likely. Thus, wear is reduced or avoided, the service life of the spring 6 is extended, and the reliability of the solenoid valve is improved.
[0022] Thus, in this embodiment, the groove structure for mounting the spring 6 includes a passage and a positioning portion provided on the bottom wall of the passage. By arranging the passage, the position of the main body of the spring 6 is restricted to a certain extent, preventing excessive deformation or displacement. Therefore, by making the hole diameter D3 of the passage large and arranging the distance between the spring 6 and the side wall of the passage large, friction between the main body of the spring 6 and the side wall during compression deformation is avoided. The positioning portion reliably positions the close-contact segment of the spring 6, achieving positioning of the entire spring 6, and similarly, contact friction can be avoided or reduced.
[0023] Furthermore, the axial height of the solenoid valve of the first contact segment portion 61 is greater than the depth of the first positioning groove 75, and similarly, the axial height of the solenoid valve of the second contact segment portion 62 is greater than the depth of the second positioning groove 517. In this way, during compression deformation, it can be guaranteed that the main body portion of the spring 6 located between the two contact segments will not rub against the first positioning groove 75 or the second positioning groove 517, and will also be less likely to rub against the bottom wall 74 of the first passage portion 73 and the bottom wall 511 of the second passage portion 518.
[0024] Furthermore, by making the number of turns of the first contact segment portion 61 and the second contact segment portion 62 one or more, the reliability of compression and contact of the contact segment portion is further guaranteed, and the connection position with the main body portion of the spring 6 remains the same, without friction with the first positioning groove 75 or the second positioning groove 517.
[0025] In this embodiment, if the height of the first contact segment portion 61 along the axial direction of the valve device is defined as h2, and the depth of the first positioning groove 75 or the height of the first positioning projection 75' is defined as h1, then the condition 0.8h2 ≤ h1 ≤ h2 is satisfied. That is, by making the height h2 of the first contact segment portion 61 slightly larger than h2, a gap fit with the positioning portion is guaranteed, thereby improving the positioning effect.
[0026] As shown in Figure 2, in this embodiment, the connection position between the first positioning groove 75 and the bottom wall 76 of the first passage 73 is chamfered, and the connection position between the second positioning groove 511 and the bottom wall 519 of the second passage 518 is also chamfered. In this way, it is further ensured that the connection position between the contact segment and the main body of the spring 6 does not rub against the chamfered position during the compression process, or such friction is reduced.
[0027] As shown in Figure 1, in this embodiment, when the solenoid valve is in the closed state, there is a first gap H1 between the movable core member 5 and the fixed core member 7 in the axial direction, and the solenoid valve further includes an upward position limiting member. After the solenoid valve opens, the movable core member 5 and the upward position limiting member are restricted in position in the axial direction, and when the valve is closed, there is a second gap H2 between the movable core member 5 and the upward position limiting member in the axial direction, with the first gap H1 being greater than the second gap H2.
[0028] Referring to Figure 1 again, Figures 3 to 5 are combined. Figure 3 is a schematic diagram of the sleeve 3 in Figure 1, Figure 4 is a schematic diagram of the fixed core member 7 in Figure 1, and Figure 5 is a schematic diagram of the movable core member 5 in Figure 1.
[0029] In this embodiment, the solenoid valve further includes a connecting nut 4, a sleeve 3, and a valve seat 1, wherein the sleeve 3 is fixed to a fixed core member 7, and as shown in Figure 4, a first annular step 72 is provided on the outer peripheral wall of the fixed core member 7, and the upper end surface 33 of the sleeve 3 abuts against the position of the first annular step 72 and is fixed to the fixed core member 7 so as to be screwed and welded, and the portion of the fixed core member 7 below the first annular step 72 is an insertion segment 71, which is located inside the sleeve 3.
[0030] The sleeve 3 includes a cylindrical sleeve body 32, the lower end of which has a first annular portion 31 extending radially outward. The connecting nut 4 includes a cylindrical portion 42 extending axially and a second annular portion 41 extending radially. The cylindrical portion 42 and the valve seat 1 are connected by screws. As shown in Figure 1, the valve seat 1 has an annular connecting portion 14 extending axially along the solenoid valve. The cylindrical portion 42 has a female thread, and the connecting portion 14 has a male thread. The cylindrical portion 42 and the connecting portion 14 are connected by screws. In this configuration, the second annular portion 41 is pressed against the first annular portion 31 of the sleeve 3, the first annular portion 31 is pressed against the upper end of the connecting portion 14, the upper end of the connecting portion 14 is provided with an annular groove for accommodating the seal ring 2, the lower surface 31b of the first annular portion 31 is in contact with the seal ring 2 and sealed, and the upper surface 31a is in contact with the second annular portion 41, thereby fixing the sleeve 3 and the valve seat 1, and the movable core member 5 is positioned inside the sleeve 3 and slidably engaged with the inner wall of the sleeve 3 along the axial direction. As can be seen from this, the method of connection between the sleeve 3 and the valve seat 1 is not limited to this, and may be a normal connection method such as direct welding or screwing, and is not specifically limited in this embodiment.
[0031] As shown in Figure 5, the movable core member 5 further includes a gasket 53, the lower end of the movable core body 51 is provided with a second annular step 513, the gasket 53 is fitted onto the movable core body 51 and supported by the second annular step 513, the inner wall of the first annular portion 31 of the sleeve 3 forms an upward movement limiting member, and there is a second gap H2 between the gasket 53 and the first annular portion 31 in the axial direction, and by positioning the gasket 53, the occurrence of collision noise and wear when in contact with the first annular portion 31 can be reduced or avoided, as can be seen from this, the second annular step 513 of the movable core member 53 may be in direct contact with the first annular portion 31, or the gasket may be provided on the lower surface of the first annular portion 31.
[0032] In this embodiment, if the first interval H1 is larger than the second interval H2, when the solenoid valve opens to its maximum opening, the movable core member 5 is first restricted in position by the upward position limiting member. That is, the maximum stroke of the movable core member 5 along the axial direction is the second interval H2. In this case, the movable core member 5 is not in contact with the fixed core member 7, and after the solenoid valve is deactivated, there is no large residual magnetic force between the movable core member 5 and the fixed core member 7. The spring 6 does not need to overcome a large residual magnetic force to close the valve, and accordingly, it does not need to overcome the spring force using a large electromagnetic force to open the valve. In other words, by setting the first interval H1 to be larger than the second interval H2, it is ensured that the movable core member 5 and the fixed core member 7 are not in contact, and furthermore, residual magnetism is reduced.
[0033] As described above, the first annular portion 31 of the sleeve 3 is used as the upward position limiting member, but it is not limited to this, and any member that can limit the valve opening stroke relative to the movable core member 5 is acceptable. For example, the upward position limiting member may be provided at the connection portion 14 of the valve seat 1.
[0034] Referring to Figures 6-8, Figure 6 is a schematic diagram of the movable core body 51 of the movable core member 5 in Figure 5, Figure 7 is a schematic diagram of the sealing block 54 of the movable core member 5 in Figure 5, and Figure 8 is a schematic diagram of the guide ring 52 of the movable core member 5 in Figure 5.
[0035] In this embodiment, the movable core member 5 includes a movable core body 51, a sealing block 54, and a guide ring 52. The lower end of the movable core body 51 is a cylindrical portion 515 with a housing chamber formed therein. The sealing block 54 is provided inside the housing chamber and has a certain degree of elasticity. The lower edge of the cylindrical portion 515 has a position limiting portion 516 that extends inward. The sealing block 54 is pushed into the housing chamber, and the outer circle 544 of the sealing block 54 and the inner circle of the cylindrical portion 515 are fitted together. The upper end surface 542 of the sealing block 54 abuts against the bottom wall 514 of the housing chamber, and a third annular step 543 is further provided at the lower end of the sealing block 54. The third annular step 543 abuts against a position limiting portion 516, which restricts the sealing block 54 from detaching from the housing chamber. The lower end surface 541 of the sealing block 54 protrudes downward from the position limiting portion 516 and directly contacts the edge of the valve opening 12, thereby exhibiting an excellent sealing effect.
[0036] An annular groove 512 is further provided on the outer circumferential wall of the movable core body 51, and a portion of the guide ring 52 is housed within the annular groove 512. The outer diameter D2 of the guide ring 52 is larger than the outer diameter D1 of the annular groove 512, meaning that a portion of the guide ring 52 protrudes radially from the annular groove 512. In this way, when the movable core member 5 and the sleeve 3 slide relative to each other, the guide ring 52 slidably contacts the sleeve 3, reducing friction and making axial movement smoother. The guide ring 52 is manufactured from a lubricating plastic material to further reduce sliding friction.
[0037] Furthermore, as shown in Figure 8, the guide ring 52 is provided with a notch 521 that extends along the axial direction, that is, the guide ring 52 is cut in the circumferential direction to form the notch 521. With this arrangement, when the solenoid valve opens and then attempts to close, the coil of the solenoid valve is deactivated, and the medium at the inlet 11 of the solenoid valve enters the space between the movable core member 5 and the fixed core member 7 through the notch 521 of the guide ring 52. The pressure of the medium acts on the movable core member 5, and the pressure of the medium above the movable core member 5 is equal to the pressure at the inlet 11. Below the sealing block 54, the valve port 12 is still open, so the pressure below the sealing block 54 is lower than the pressure at the inlet 11. Therefore, due to the pressure difference, the sealing block 54 moves downward, closing the valve port 12 more quickly and increasing the response speed of the valve closing.
[0038] The number of guide rings 52 may be one, or there may be multiple, i.e., two or more. When multiple guide rings 52 are arranged, the multiple guide rings 52 are distributed along the axial direction of the movable core body 51, and the movable core body 51 is provided with annular grooves 512 corresponding to the number of guide rings 52. In this embodiment, a total of two guide rings 52 are provided, and with multiple guide rings 52, the sliding engagement with the inner wall of the sleeve 3 is more stable.
[0039] In this embodiment, the operation process of the solenoid valve is as follows: The solenoid valve and coil (not shown in Figure 1) are used as a set, and the medium controlled by the solenoid valve may be gas or other fluid. Here, we will explain using the example where the medium is gas and the solenoid valve is a pneumatic solenoid valve. The inlet 11 of the solenoid valve is in communication with high-pressure gas, and the outlet 13 of the valve seat 1 is in communication with the atmosphere. The high-pressure gas flows into the cavity between the movable core member 5 and the fixed core member 7 through the gap between the sleeve 3 and the movable core member 5, and the movable core member 5 seals the valve opening 12 due to the pressure of the high-pressure gas and the action of the spring force. When energized, the coil forms a magnetic field around the valve body of the solenoid valve, and the electromagnetic force causes the movable core member 5 to overcome the force of the spring 6 and move upward. The gas in the cavity at the upper end of the movable core member 5 flows out to the lower end of the movable core member 5 along the notch 521 of the guide ring 52, the gas pressure at the upper end of the movable core member 5 decreases, and when the upper end surface 531 of the gasket 54 and the lower end surface of the first annular portion 31 of the sleeve 3 come into contact, that is, after the movable core member 5 has risen by a distance H2, the valve port 12 reaches its maximum opening.
[0040] When the coil fails, the magnetic field formed by the coil disappears, and the high-pressure gas at the inlet 11 flows into the cavity between the movable core member 5 and the fixed core member 7 along the notch 521 of the guide ring 52. Due to the spring force and the pressure of the high-pressure gas, the movable core member 5 moves downward more quickly, and when the lower end surface 541 of the sealing block 54 contacts the edge of the valve opening 12, the valve opening 12 closes.
[0041] Referring to Figures 9 and 10, Figure 9 is a schematic diagram of the movable core body 51 of the movable core member 5 of the solenoid valve in the second embodiment of this application, and Figure 10 is a schematic diagram of the fixed core member 7 of the solenoid valve in the second embodiment of this application.
[0042] The second embodiment has the same structure as the first embodiment, the only difference being the structure of the positioning parts provided on the movable core member 5 and the fixed core member 7. In the first embodiment, the positioning parts are a first positioning groove 75 and a second positioning groove 517, whereas in the second embodiment, the positioning parts are positioning protrusions. As shown in Figures 9 and 10, the bottom wall 76 of the first hole portion 73 of the fixed core member 7 is provided with a protruding first positioning projection 75', and the bottom wall 519 of the second hole portion 518 of the movable core member 5 is provided with a protruding second positioning projection 517'. The first contact segment portion 61 of the spring 6 is fitted onto the first positioning projection 75' and gap-fitted against the outer circumferential wall of the first positioning projection 75', and the second contact segment portion 62 of the spring 6 is fitted onto the second positioning projection 517' and gap-fitted against the outer circumferential wall of the second positioning projection 517'. Similarly, this gap-fitting has a small gap and, unlike intermediate fitting or interlocking fitting, allows the contact segment portion of the spring 6 to be easily fitted to the outside of the first positioning projection 75' and the second positioning projection 517'. The effects of the first positioning projection 75' and the second positioning projection 517' can be understood by referring to the first embodiment, and are not elaborated upon here. Similarly, the first contact segment portion 61 and the outer peripheral wall of the first positioning projection 75' may be further locked together, and the second contact segment portion 62 and the outer peripheral wall of the second positioning projection 517' may also be locked together.
[0043] Here, as shown in Figures 9 and 10, the positioning projection is a columnar structure. Clearly, the positioning projection is not limited to a columnar structure, and the arrangement of the positioning projection is mainly for the purpose of fitting the contact segment portion of the spring 6 onto the outside and providing positioning to the contact segment portion. Therefore, the positioning projection does not have to be a columnar structure, and may be an annular structure, for example.
[0044] In the above embodiment, both the movable core member 5 and the fixed core member 7 are provided with positioning parts, and by providing a positioning part on either one of them, the spring 6 can be positioned to a certain extent, thereby reducing wear. Furthermore, the structure of the positioning parts provided on the movable core member 5 and the fixed core member 7 may differ. As in the first embodiment, both may be provided with positioning grooves as positioning parts, or as in the second embodiment, they may be provided with positioning protrusions as positioning parts, or one may be provided with positioning protrusions as positioning parts and the other with positioning grooves as positioning parts.
[0045] This specification uses specific examples to describe the principles and embodiments of this application, and the above description of embodiments is used solely for the purpose of understanding the methods and spirit of this application. Those skilled in the art may make several improvements and modifications to this application, provided that they do not deviate from the principles of this application, and these improvements and modifications also fall within the scope of protection of the claims of this application. [Explanation of Symbols]
[0046] 1 ··· valve seat; 11...Entrance; 13...exit; 12...valve opening; 2 ···Seal ring; 3 sleeves; 31 ···First ring section; 31a...Top surface; 31b...lower surface; 32 ···Sleeve body; 33...Top surface; 4. Connecting nuts; 41 ···Second Ring Section; 42. ...Cylindrical section; 5- ...Movable core member; 51...Movable core body; 511 ···Bottom wall; 512 ···Annular groove; 513 ···Second ring stage; 514 ···Bottom wall; 515 ···Cylindrical part; 516...Position restriction section; 517 ···Second positioning groove; 517' ···Second positioning projection; 518...Second tunnel section; 519 ···Bottom wall; 52 ···Guide ring; 521... Notch; 53...gasket; 531...Top surface; 54. Sealing block; 541...lower end surface; 542...Top surface; 543 ···Third ring stage; 544 ···Outer circle; 6 ···Spring; 7. Fixed core member; 71... Insertion segment; 72 ···First ring stage; 73...1st tunnel section; 74 ···Bottom wall; 75 ···First positioning groove; 75' ···First positioning projection; 76...Bottom wall.
Claims
1. A valve device comprising a fixed core member, a movable core member, and an elastic member between the fixed core member and the movable core member, wherein the elastic member includes a first end and a second end, and the wire diameter of the elastic member is defined as M. The fixed core member is provided with a first passage portion and a first positioning portion, the first passage portion is recessed inward from the end face of the fixed core member, the first positioning portion is recessed or protrudes from the bottom wall of the first passage portion, the diameter of the first passage portion is larger than the diameter of the first positioning portion, the first passage portion includes a first passage wall, the first end is position-restricted to the first positioning portion, there is a predetermined distance L1 between the elastic member and the first passage wall in the radial direction, L1 ≥ 0.5M and / or, the movable core member is provided with a second passage portion and a second positioning portion, the second passage portion is recessed inward from the end face of the movable core member, the second positioning portion is recessed or protrudes from the bottom wall of the second passage portion, the diameter of the second passage portion is larger than the diameter of the second positioning portion, the second passage portion includes a second passage wall, the second end is position-restricted to the second positioning portion, and the distance between the elastic member and the second passage wall in the radial direction is defined to be a predetermined distance L2, where L2 ≥ 0.5M.
2. The valve device according to claim 1, characterized in that the first end portion includes a first contact segment portion, the second end portion includes a second contact segment portion, the first contact segment portion is position-restricted to the first positioning portion, and / or the second contact segment portion is position-restricted to the second positioning portion.
3. The valve device according to claim 1, characterized in that the first positioning portion is recessed or protruding from the bottom wall of the first hole portion, the first positioning portion is a first positioning groove or a first positioning projection, the first end portion includes a first contact segment portion, at least a part of the first contact segment portion is position-restricted by the first positioning groove and is gap-fitted or locked to the groove wall of the first positioning groove, or the first contact segment portion is externally fitted onto the first positioning projection and is gap-fitted or locked to the side wall of the first positioning projection.
4. The valve device according to claim 3, characterized in that the number of turns of the first contact segment portion is one or more, and when the engagement gap between the first contact segment portion and the first positioning portion is defined as S1, S1 ≤ 0.1 mm is satisfied.
5. The valve device according to claim 3, characterized in that, when the height of the first contact segment portion along the axial direction of the valve device is defined as h2, and the depth of the first positioning groove or the height of the first positioning projection is defined as h1, 0.8h2 ≤ h1 ≤ h2 is satisfied.
6. The valve device according to claim 1, characterized in that the second positioning portion is recessed or protruding from the bottom wall of the second hole portion, the second positioning portion is a second positioning groove or a second positioning projection, the second end portion includes a second contact segment portion, at least a part of the second contact segment portion is position-restricted by the second positioning groove and is gap-fitted or locked to the groove wall of the second positioning groove, or the second contact segment portion is externally fitted onto the second positioning projection and is gap-fitted or locked to the side wall of the second positioning projection.
7. The valve device according to claim 1, characterized in that the first positioning portion is a first positioning groove, the second positioning portion is a second positioning groove, the first positioning groove is recessed inward from the bottom wall of the first passage portion, the second positioning portion is recessed inward from the bottom wall of the second passage portion, the first end portion includes a first contact segment portion, at least a part of the first contact segment portion is position-restricted by the first positioning groove and is gap-fitted or locked to the groove wall of the first positioning groove, and the second end portion includes a second contact segment portion, at least a part of the second contact segment portion is position-restricted by the second positioning groove and is gap-fitted or locked to the groove wall of the second positioning groove.
8. The valve device according to claim 7, characterized in that the connection position between the first positioning groove and the bottom wall of the first passage is a chamfered structure, and the connection position between the second positioning groove and the bottom wall of the second passage is a chamfered structure.
9. The valve device according to claim 1, characterized in that the first positioning portion is a first positioning projection, the second positioning portion is a second positioning projection, the first positioning projection protrudes from the bottom wall of the first passage portion, the second positioning projection protrudes from the bottom wall of the second passage portion, the first end portion includes a first sealing segment portion, the second end portion includes a second sealing segment portion, the first sealing segment portion is fitted onto the first positioning projection and is gap-fitted or locked to the first positioning projection, and the second sealing segment portion is fitted onto the second positioning projection and is gap-fitted or locked to the second positioning projection.
10. The valve device according to any one of claims 1 to 9, wherein the valve device includes a gasket portion connected to the movable core member, the valve device further includes an upward position limiting member, and when the valve device is in a fully open state, the gasket portion is in contact with the upward position limiting member, and when the valve device is in a closed state, there is a first distance in the axial direction between the movable core member and the fixed core member, and a second distance in the axial direction between the gasket portion and the upward position limiting member, the first distance being greater than the second distance.
11. The valve device according to claim 10, wherein the solenoid valve includes a connecting nut, a sleeve, and a valve seat, the sleeve is fixed to the fixed core member, the lower end of the sleeve has a first annular portion extending radially outward, the connecting nut includes a cylindrical portion extending axially and a second annular portion extending radially, the cylindrical portion is screw-connected to the valve seat, the first annular portion is crimped between the second annular portion and the valve seat, and the first annular portion constitutes the upward movement position limiting member.