Valve device

Abstract

A valve device comprises an iron core assembly, and the iron core assembly comprises a static iron core and a movable iron core set. The movable iron core group comprises a first movable iron core and a second movable iron core, and the second movable iron core can move relative to the first movable iron core in the axis direction of the iron core assembly; the valve device comprises a power-off state, and in the power-off state, the distance between the first movable iron core and the static iron core is larger than the distance between the second movable iron core and the static iron core in the axis direction of the iron core assembly; the valve device comprises a power-on state, the power-on state comprises a first state, and in the first state, the first movable iron core and the static iron core are attracted; through the arrangement, the power of the valve device can be reduced.

Description

Technical Field

[0001] The present application relates to the field of fluid control technology, and in particular to a valve device. Background Art

[0002] In the field of fluid control, valve devices serve as control components for controlling whether a flow path is open or not. When the valve device is working, electrical energy is required to change the attraction state of the moving iron core and the static iron core. How to reduce the power of the valve device is a technical problem. Summary of the Invention

[0003] The purpose of this application is to provide a valve device that is conducive to reducing the power of the valve device.

[0004] To achieve the above objectives, one embodiment of the present application adopts the following technical solution:

[0005] A valve device includes an iron core assembly, wherein the iron core assembly includes a static iron core and a moving iron core group;

[0006] The movable iron core assembly includes a first movable iron core and a second movable iron core, and the second movable iron core is movable relative to the first movable iron core along the axis of the iron core assembly;

[0007] The valve device includes a power-off state, in which, along the axis direction of the iron core assembly, the distance between the first movable iron core and the static iron core is greater than the distance between the second movable iron core and the static iron core;

[0008] The valve device includes an energized state, and the energized state includes a first state. In the first state, the first movable iron core is attracted to the static iron core.

[0009] In one embodiment provided by the present application, it includes a core assembly having a static core and a moving core group, the moving core group including a first moving core and a second moving core that can move relative to each other along the axial direction of the core assembly; the valve device includes a power-off state, in which the distance between the first moving core and the static core is greater than the distance between the second moving core and the static core along the axial direction of the core assembly; the valve device includes a power-on state, the power-on state includes a first state, in which the first moving core and the static core are attracted; such an arrangement, without changing the stroke of the first moving core, is conducive to reducing the distance between the static core and the moving core group when the valve device is in the power-off state, thereby reducing the valve opening power of the valve device. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the three-dimensional structure of the valve device provided by this application;

[0011] Figure 2 is a schematic cross-sectional structural diagram of the valve device provided by the present application in a power-off state;

[0012] Figure 3 is a schematic cross-sectional structural diagram of the valve device provided by the present application in a first state;

[0013] Figure 4 It is a schematic cross-sectional structural diagram of the second state of the valve device provided by this application.

[0014] Reference numerals:

[0015] 1. Valve seat assembly; 10. Valve seat; 100. Valve chamber; 101. Upper valve chamber; 102. Lower valve chamber; 103. Valve port; 104. First port; 105. Second port; 106. Connecting port; 11. Valve port portion; 110. Second abutting portion;

[0016] 2. Iron core assembly; 20. Stationary iron core; 200. Valve assembly; 21. Moving iron core assembly; 210. First moving iron core; 2100. Moving iron core body; 211. Second moving iron core; 2110. Communication hole; 212. Accommodation cavity; 213. First spring; 214. First limiting portion; 2140. First through hole; 215. Second limiting portion; 216. Second through hole; 22. Second spring; 221. Large-diameter end; 222. Small-diameter end;

[0017] 3. Piston assembly; 30. Piston body; 300. Piston hole; 31. Support portion; 32. First abutment portion; 33. Balance hole;

[0018] 4. Cannula; 40. Lumen;

[0019] 5. Coil assembly;

[0020] 6. Sealing assembly; 60. Sealing ring; 61. Gly ring; 62. Ring groove. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0022] Combine Figure 1-Figure 3 , illustrating a first embodiment of the valve device 200. In this embodiment, the valve device 200 includes a valve seat assembly 1, an iron core assembly 2, a piston assembly 3, a sleeve 4 and a coil assembly 5. The valve seat assembly 1 includes a valve cavity 100, wherein at least part of the piston assembly 3 is located in the valve cavity 100, at least part of the iron core assembly 2 is located above the piston assembly 3 and located on the inner periphery of the sleeve 4, the coil assembly 5 is located above the valve seat assembly 1 and is sleeved on the outer periphery of the iron core assembly 2 and the sleeve 4. Along the axial direction of the valve device 200, part of the sleeve 4 is located between the coil assembly 5 and the valve seat assembly 1. The sleeve 4 is fixedly or limit-connected to the valve seat assembly 1 and sealed at the connection between the two.

[0023] Combine Figures 2 to 3As shown, the valve seat assembly 1 also has a first port 104, a second port 105, a connecting port 106, and a valve port 103. The second port 105 is connected to the valve cavity 100, and the valve port 103 can be connected to the valve cavity 100. The valve port 103 is connected to the first port 104. The sleeve 4 includes a tubular cavity 40, and the tubular cavity 40 is connected to the valve cavity 100 through the connecting port 106. Specifically, the first port 104, the second port 105, the valve port 103 and the connecting port 106 are formed on the valve seat assembly 1. Further, the piston assembly 3 includes a piston body 30, a support portion 31 and a first abutting portion 32. The piston body 30 is fixedly or positionally connected to the support portion 31, the support portion 31 is fixedly or positionally connected to the first abutting portion 32, and the support portion 31 is fixedly or positionally connected to the first abutting portion 32. 32 is located on the side of the piston assembly 3 away from the core assembly 2, and a second abutting portion 110 is provided at the valve port 103 for abutting against the first abutting portion 32 to achieve sealing. Specifically, the first abutting portion 32 is made of elastic material, and the second abutting portion 110 is made of rigid material. In one embodiment, the first abutting portion 32 is made of polytetrafluoroethylene, and the second abutting portion 110 is made of metal material or non-metallic rigid material. In other embodiments, the second abutting portion 110 can also be made of elastic material, and the first abutting portion 32 is made of rigid material. In one embodiment, the second abutting portion 110 is made of polytetrafluoroethylene, and the first abutting portion 32 is made of metal material or non-metallic rigid material.

[0024] Combine Figures 2 to 3 As shown, the valve seat assembly 1 includes a valve seat 10 and a valve mouth portion 11. The valve seat 10 is fixedly or positionally connected to the valve mouth portion 11 and sealed at the connection between the two to form the valve seat assembly 1. The valve seat 10 has an upper valve cavity 101 with an opening facing downward. Along the axial direction of the valve seat assembly 1, the valve seat 10 has a connecting port 106, which is communicated with the upper valve cavity 101. The valve mouth portion 11 has a lower valve cavity 102 with an opening facing upward. A first port 104, a second port 105, and a valve port 103 are formed on the valve mouth portion 11. The second port 105 is connected to the lower valve cavity 102. When the valve device 200 is in the first state or the second state, the valve port 103 and the first port 104 are both connected to the lower valve cavity 102. The inner diameter of the wall of the upper valve cavity 101 is smaller than the inner diameter of the wall forming the lower valve cavity 102. The upper valve cavity 101 and the lower valve cavity 102 are combined to form the valve cavity 100. The lower end wall of the valve seat 10 forms at least part of the top wall of the lower valve cavity 102. In other embodiments, the valve seat 10 and the valve port portion 11 can also be an integrated structure.

[0025] Combine Figures 2 to 3As shown, at least part of the core assembly 2 is located above the piston assembly 3 and on the inner periphery of the sleeve 4. Specifically, the core assembly 2 includes a static core 20 and a moving core group 21. At least part of the static core 20 is located on the inner periphery of the sleeve 4 and is fixed to the inner wall of the sleeve 4. The fixing method can be welding or riveting. The moving core group 21 can move axially in the sleeve 4, so that the moving core group 21 drives the piston assembly 3 to move axially. In this embodiment, the moving core group 21 is closer to the piston assembly 3 than the static core 20, or the static core 20 is located above the moving core group 21. In other embodiments, the static core 20 can also be closer to the piston assembly 3 than the moving core group 21.

[0026] Combine Figures 2 to 3 As shown, the core assembly 2 also includes a second spring 22, which is used to drive the moving core group 21 to separate from the static core 20. Specifically, along the axial direction of the core assembly 2, the second spring 22 is arranged between the support part 31 and the top wall of the lower valve cavity 102, and the outer diameters of the two ends of the second spring 22 are inconsistent. The second spring 22 includes a large diameter end 221 and a small diameter end 222. The outer diameter of the large diameter end 221 is larger than the outer diameter of the small diameter end 222; the outer side of the large diameter end 221 abuts against the side wall of the lower valve cavity 102, and the inner side of the small diameter end 222 abuts against the outer side wall of the support part 31. Along the axial direction of the core assembly 2, the large diameter end 221 abuts against the bottom wall of the valve seat 10, and the small diameter end 222 abuts against the support part 31.

[0027] Combine Figures 2 to 3As shown, at least part of the piston assembly 3 is located in the valve cavity 100 and can slide up and down along the cavity wall of the valve cavity 100. Specifically, the piston assembly 30 is sealed and connected to the inner wall forming the valve cavity 100. At least part of the upper valve cavity 101 is located on the upper side of the piston assembly 30, and at least part of the lower valve cavity 102 is located on the lower side of the piston assembly 30. The tube cavity 40 is connected to the upper valve cavity 101 through the connecting port 106 and the gap between the moving iron core group 21 and the wall of the lower tube cavity 40. The first port 104 and the second port 105 are both connected to the lower valve cavity 102. Specifically, the piston assembly 3 includes a piston body 30, which is slidably arranged in the valve cavity 100. The piston body 30 is sealed and connected to the inner wall forming the valve cavity 100. Specifically, a sealing ring 60 and a grid ring 61 are provided between the piston body 30 and the inner wall forming the upper valve cavity 101. The sealing ring 60 and the grid ring 61 Pressed between the piston body 30 and the wall forming the upper valve chamber 101, or in other words, when the piston body 30 slides inside the valve chamber 100, the sealing ring 60 and the grid ring 61 always abut against the piston body 30 and the inner wall forming the upper valve chamber 101; specifically, the wall forming the upper valve chamber 101 has an annular groove 62, at least part of the sealing ring 60 is located in the annular groove 62, the inner ring of the grid ring 61 abuts against the piston body 30, and the outer ring of the grid ring 61 abuts against the sealing ring 60. In other embodiments, the annular groove 62 can also be opened on the outer wall of the piston body 30, at least part of the sealing ring 60 is located in the annular groove 62, the inner ring of the grid ring 61 abuts against the sealing ring 60, and the outer ring of the grid ring 61 abuts against the wall forming the upper valve chamber 101. In the process of the piston body 30 sliding up and down along the cavity wall of the upper valve chamber 101, the grid ring 61 is always pressed against the wall forming the upper valve chamber 101.

[0028] Combine Figures 2 to 3As shown, the moving iron core group 21 includes a first moving iron core 210, a second moving iron core 211, a first spring 213, a first limiting portion 214 and a second limiting portion 215. The first moving iron core 210 has a accommodating cavity 212. Along the axial direction of the iron core assembly 2, the first limiting portion 214 is farther away from the static iron core 20 than the second limiting portion 215. In one embodiment, the first limiting portion 214 is connected to the wall forming the accommodating cavity 212, and the second limiting portion 215 and the first moving iron core 210 are an integrated structure. In other embodiments, the first limiting portion 214 can also be fixed to the wall forming the accommodating cavity 212 or be an integrated structure, and the second limiting portion 215 can also be fixed or connected to the first moving iron core 210. The second moving iron core 211 is located between the first limiting portion 214 and the second limiting portion 215. The second moving iron core 211 is connected to the wall forming the accommodating cavity 212. The first spring 213 is in sliding fit, with one end close to the static iron core 20 abutting against the second movable iron core 211, and the end of the first spring 213 away from the static iron core 20 abutting against the first limiting portion 214. Of course, in other embodiments, the accommodating cavity 212 can also be opened in the second movable iron core 211, that is, the second movable iron core 211 is sleeved on the outside of the first movable iron core 210, and the two are in sliding fit, and the second movable iron core 211 is located between the first limiting portion 214 and the second limiting portion 215. The first limiting portion 214 is fixed to the outer wall of the first movable iron core 210, is connected in a limiting manner, or is an integrated structure, and the second limiting portion 215 is fixed to the outer wall of the first movable iron core 210, is connected in a limiting manner, or is an integrated structure; in addition, on the radial plane of the first movable iron core 210 or the second movable iron core 211, the first movable iron core 210 and the second movable iron core 211 can also be semi-enclosed structures with each other.

[0029] The second moving iron core 211 can be moved by means of magnetic force. The second moving iron core 211 is made of the same material as the first moving iron core 210 and the static iron core 20. When the valve device 200 is in the power-off state, that is, when the coil assembly 5 is powered off, the second moving iron core 211 is separated from the static iron core 20. At least part of the second moving iron core 211 is located between the first moving iron core 210 and the static iron core 20 under the elastic force of the first spring 213. The second moving iron core 211 is in contact with the first moving iron core 210 under the elastic force of the first spring 213. When the valve device 200 is in the power-on state, that is, When the coil assembly 5 is energized, the second moving iron core 211 moves under the magnetic attraction of the static iron core 20, and the second moving iron core 211 drives the first moving iron core 210 to move. The second moving iron core 211 is first attracted to the static iron core 20, and the first moving iron core 210 moves toward the static iron core 20. At this time, the valve device 200 is in the second state. Subsequently, the first moving iron core 210 continues to move in the direction of the static iron core 20 under the magnetic attraction of the static iron core 20 until the first moving iron core 210 is attracted to the static iron core 20. At this time, the valve device 200 is in the first state.

[0030] Combine Figures 2 to 3As shown, the moving iron core group 21 is fixedly or positionally connected to the piston assembly 3. Specifically, along the axial direction of the piston assembly 3, the piston body 30 is penetrated by a piston hole 300, at least part of the first moving iron core 210 is located inside the piston hole 300 and is fixedly connected to the piston body 30, and the accommodating chamber 212 is communicated with the piston hole 300; in addition, a balancing hole 33 is provided on the moving iron core group 21 and the piston assembly 3, and the upper valve chamber 101 and the lower valve chamber 102 are communicated through the balancing hole 33; specifically, the balancing hole 33 includes the piston hole 300, the accommodating chamber 212, the first through hole 2140 and the second through hole 216, along the moving iron core group 21. In the axial direction of the core 21, the first through hole 2140 passes through the first limiting portion 214, and the first through hole 2140 connects the accommodating chamber 212 and the piston hole 300. Of course, in an embodiment where the second limiting portion 215 is farther away from the static iron core than the first limiting portion 214, the first through hole 2140 passes through the second limiting portion 215, and along the radial direction of the moving iron core 21, the second through hole 216 passes through the first moving iron core 210, and the second through hole 216 connects the upper valve chamber 101 and the accommodating chamber 212; in other embodiments, the balancing hole 33 can also directly pass through the piston body 30 to connect the upper valve chamber 101 and the lower valve chamber 102.

[0031] Combine Figure 2 and Figure 3 Since at least part of the static iron core 20 or the moving iron core group 21 is located at the connecting port 106, in order to prevent the static iron core 20 or the moving iron core group 21 from being unable to seal the connecting port 106 and blocking the connecting port 106, resulting in poor circulation of the working medium between the tube cavity 40 and the upper valve cavity 101, a pressure difference occurs on both sides of the static iron core 20 or the moving iron core group 21 located at the connecting port 106 in the axial direction of the iron core assembly 2, resulting in the static iron core 20 or the moving iron core group 21 located at the connecting port 106 being pushed by the working medium along its axial direction, the second moving iron core 211 has a connecting hole 2110, and the connecting hole 2110 passes through the second moving iron core 211 along the axial direction of the second moving iron core 211, and the connecting hole 2110 connects the accommodating cavity 212 and the tube cavity 40. Of course, in other embodiments, the accommodating cavity 212 and the tube cavity 40 can also be connected through the gap between the second moving iron core 211 and the wall forming the accommodating cavity 212.

[0032] Combine Figures 2 to 3 As shown, the coil assembly 5 is sleeved on the outer periphery of the core assembly 2 and part of the sleeve 4. Specifically, the coil assembly 5 includes a coil portion and a magnetic conductor, which are fixed by snap-fitting. Both the coil portion and the magnetic conductor are provided with corresponding through holes, and the through holes of the coil portion are coaxially arranged with the through holes of the magnetic conductor. At least part of the core assembly 2 and the sleeve 4 are located in the through holes of the coil portion and the magnetic conductor.

[0033] Combine Figures 2 to 4As shown, in a specific embodiment, the coil assembly 5 is detachably connected to the valve seat assembly 1. The working medium can enter the lower valve chamber 102 from the first port 104 and enter the upper valve chamber 101 through the balancing hole 33. Then, when the piston body 30 leaves the valve port 103, the working medium enters the second port 105 through the valve port 103. When the valve device 200 is powered on or off, the moving iron core assembly 21 can drive the piston body 30 to move axially within the valve chamber 102 along the valve device 200, thereby opening or closing the valve port 103, so that the valve device 200 is opened or closed. Specifically, a second abutment portion 110 is provided at the valve port 103. The second abutment portion 110 is annular. When the piston body 30 closes the valve port 103, the piston body 30 abuts against the second abutment portion 110 to seal. In other embodiments, the working medium can enter the valve chamber 100 from the second port 105. When the piston body 30 separates from the valve port 103, the working medium flows out from the first port 104.

[0034] The various technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features of the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this description.

[0035] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A valve device, characterized in that: It comprises an iron core assembly (2), wherein the iron core assembly (2) comprises a static iron core (20) and a moving iron core group (21); The movable iron core assembly (21) comprises a first movable iron core (210) and a second movable iron core (211), and the second movable iron core (211) is movable relative to the first movable iron core (210) along the axial direction of the iron core assembly (2); The valve device (200) includes a power-off state, in which, along the axial direction of the iron core assembly (2), the distance between the first movable iron core (210) and the static iron core (20) is greater than the distance between the second movable iron core (211) and the static iron core (20); The valve device (200) includes an energized state, wherein the energized state includes a first state. In the first state, the first moving iron core (210) and the static iron core (20) are attracted.

2. The valve device according to claim 1, characterized in that The power-on state also includes a second state, in which the second moving iron core (211) is attracted to the static iron core (20), and the first moving iron core (210) moves toward the static iron core (20).

3. The valve device according to claim 1 or 2, characterized in that The movable iron core group (21) includes a first spring (213), wherein one end of the first spring (213) close to the static iron core (20) abuts against the second movable iron core (211), and one end of the first spring (213) away from the static iron core (20) abuts against the first movable iron core (210).

4. The valve device according to claim 3, characterized in that The first movable iron core (210) further comprises a movable iron core body (2100), a first limiting portion (214), and a second limiting portion (215); the first limiting portion (214) and the movable iron core body (2100) are fixedly or position-limitingly connected or are an integrated structure; an end of the first spring (213) away from the static iron core (20) abuts against the first limiting portion (214); Along the axial direction of the iron core assembly (2), the second limiting portion (215) is located between at least a portion of the second moving iron core (211) and the static iron core (20), and the second limiting portion (215) is fixedly or positionally connected to the moving iron core body (2100) or is an integrated structure.

5. The valve device according to claim 4, characterized in that The first moving iron core (210) has an accommodating cavity (212), and at least a portion of the second moving iron core (211) is movable within the accommodating cavity (212). The first limiting portion (214) is connected to a wall forming the accommodating cavity (212), and the second limiting portion (215) and the moving iron core body (2100) are an integrated structure.

6. The valve device according to any one of claims 1 to 5, characterized in that: The valve device (200) further comprises a piston assembly (3) and a valve seat assembly (1), wherein the valve seat assembly (1) has a valve cavity (100), and the piston assembly (3) is movable inside the valve cavity (100); The first moving iron core (210) is fixedly or positionally connected to the piston assembly (3), and the valve device (200) further comprises a second spring (22). Along the axial direction of the moving iron core group (21), one end of the second spring (22) close to the static iron core (20) is fixed relative to the static iron core (20), and one end of the second spring (22) away from the static iron core (20) is fixed relative to the moving iron core group (21).

7. The valve device according to claim 6, characterized in that The valve seat assembly (1) has a valve port (103), and the valve cavity (100) can be communicated with the valve port (103). The piston assembly (3) includes a piston body (30) and a support portion (31). The piston body (30) and the support portion (31) are fixed, position-limited, or integrated. Along the axial direction of the piston assembly (3), one end of the second spring (22) close to the valve port (103) abuts against the support portion (31), and one end of the second spring (22) away from the valve port (103) abuts against the wall forming the valve cavity (100).

8. The valve device according to claim 7, characterized in that The second spring (22) includes a large-diameter end (221) and a small-diameter end (222), and the outer diameter of the large-diameter end (221) is larger than the outer diameter of the small-diameter end (222); The outer side of the large-diameter end (221) abuts against the inner wall of the valve cavity (100), and the inner side of the small-diameter end (222) abuts against the outer wall of the piston body (30).

9. The valve device according to claim 7 or 8, characterized in that The first moving iron core (210) and the piston body (30) are fixed, position-limited, or are an integrated structure. Along the axial direction of the piston assembly (3), the valve chamber (100) is respectively an upper valve chamber (101) and a lower valve chamber (102). The lower valve chamber (102) can be connected to the valve port (103). The inner diameter of the lower valve chamber (102) is larger than the inner diameter of the upper valve chamber (101). The end of the second spring (22) away from the valve port (103) abuts against the top wall forming the lower valve chamber (102). The piston body (30) slides with the side wall forming the upper valve chamber (101), and the connection between the two is sealed.

10. The valve device according to claim 9, characterized in that The valve device (200) has a balancing hole (33); The valve device (200) is in a power-off state, and the balancing hole (33) is connected to the upper valve chamber (101) and the valve port (103); the valve device (200) is in a first state, and the balancing hole (33) is connected to the upper valve chamber (101) and the lower valve chamber (102).

11. The valve device according to any one of claims 6 to 10, characterized in that: The valve seat assembly (1) further comprises a first port (104) and a second port (105), wherein the first port (104) is in communication with the valve port (103), and the second port (105) is in communication with the lower valve cavity (102); The valve device also includes a sleeve (4), which is fixed, position-limited, or integrated with the valve seat assembly (1), and the sleeve (4) has a tube cavity (40). The static iron core (20) is fixed relative to the sleeve (4), at least part of the moving iron core group (21) is located in the tube cavity (40), and at least part of the moving iron core group (21) is located in the valve cavity (100).

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