CN212106994U

CN212106994U - Valve core for valve and valve with same

Info

Publication number: CN212106994U
Application number: CN202020715967.9U
Authority: CN
Inventors: 臧琦; 翁亮; 魏伟; 于笑男; 刘靖
Original assignee: Danfoss AS
Current assignee: Danfoss AS
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-12-08
Anticipated expiration: 2030-04-30

Abstract

An embodiment of the utility model provides a case and a valve that has this case for the valve. The spool includes: a barrel portion defining an internal cavity and having first and second ends opposite in an axial direction; a dividing wall within the barrel portion and at the second end of the barrel portion; a pressure taking hole communicating an inner cavity of the cylindrical portion with an outside of the inner cavity; a guide wall extending from the second end of the cylindrical portion toward a side away from the first end of the cylindrical portion; and a flow passage that communicates one side of the guide wall toward the axis of the cylindrical portion with the other side away from the axis of the cylindrical portion. With the valve cartridge and the valve according to embodiments of the present invention, for example, the operability of the valve can be improved.

Description

Valve core for valve and valve with same

Technical Field

Embodiments of the present invention relate to a valve cartridge for a valve and a valve having the same.

Background

A conventional valve includes a valve body and a valve spool installed in the valve body. The valve body has a valve seat, and the valve element is operated by a valve stem protruding from the valve body.

Disclosure of Invention

It is an object of embodiments of the present invention to provide a valve cartridge for a valve and a valve having the same, whereby the operability of the valve can be improved, for example.

According to the utility model discloses an embodiment provides a case for valve, include: a barrel portion defining an internal cavity and having first and second ends opposite in an axial direction; a dividing wall within the barrel portion and at the second end of the barrel portion; a pressure taking hole communicating an inner cavity of the cylindrical portion with an outside of the inner cavity; a guide wall extending from the second end of the cylindrical portion toward a side away from the first end of the cylindrical portion; and a flow passage that communicates one side of the guide wall toward the axis of the cylindrical portion with the other side away from the axis of the cylindrical portion.

According to the utility model discloses an embodiment, the runner runs through the guide wall.

According to the utility model discloses an embodiment, the pressure tapping hole runs through the partition wall.

According to the utility model discloses an embodiment, the runner wall of runner includes: the first flow passage wall portion is closer to the first end of the cylindrical portion than the second flow passage wall portion in the axial direction of the cylindrical portion, and the two second flow passage wall portions are respectively located on both sides of the first flow passage wall portion in the width direction of the flow passage, the second flow passage wall portion extending from the first flow passage wall portion toward a side of the first flow passage wall portion away from the first end of the cylindrical portion.

According to an embodiment of the invention, at least a part of the pressure tapping hole extends from the first flow channel wall portion to the inner cavity of the cylindrical portion.

According to the utility model discloses an embodiment, the pressure tapping hole is located keep away from of partition wall the surface of the first end of tube-shape part with the position that the runner intersects.

According to the utility model discloses an embodiment, in the width direction of runner, the pressure tapping hole is located the size range of first runner wall part.

According to an embodiment of the present invention, in the width direction of the flow passage, the pressure taking hole is located in a range defined by a first point and a second point on both sides of the center of the first flow passage wall portion, and in the width direction of the flow passage, the distance between the first point and the second point and the center of the first flow passage wall portion is all 3.5 times the size of the first flow passage wall portion.

According to an embodiment of the present invention, a distance of the first flow passage wall portion from a surface of the partition wall, which is away from the first end of the cylindrical portion, in the axial direction of the cylindrical portion is less than or equal to 20 mm.

According to an embodiment of the invention, at least a part of the first flow channel wall portion is located in the same plane as a surface of the partition wall remote from the first end of the cylindrical portion.

According to the utility model discloses an embodiment, in the radial direction of tube-shape part, the pressure taking hole with the distance of runner is less than with the distance of the central axis of partition wall.

According to an embodiment of the present invention, in the radial direction of the cylindrical portion, the distance of the pressure taking hole from the center axis of the partition wall is in the range of 80% to 100% of the radius of the partition wall.

According to the utility model discloses an embodiment, the case still includes: an annular protrusion surrounding an outer periphery of the cylindrical portion, at least a portion of the pressure tap hole extending from a surface of the annular protrusion distal from the first end of the cylindrical portion to an inner cavity of the cylindrical portion.

According to the utility model discloses an embodiment, the case still includes: a lubricating coating material covering at least the outer peripheral surface of the cylindrical portion.

According to an embodiment of the invention, the lubricating coating comprises polytetrafluoroethylene.

According to the utility model discloses an embodiment, the pressure tapping hole makes the tube-shape part's inner chamber with the case exterior space intercommunication of one side of the first end of keeping away from the tube-shape part of inner chamber.

According to an embodiment of the invention, the guide wall extends from the second end of the barrel part in the axial direction of the barrel part.

According to the utility model discloses an embodiment still provides a valve, including foretell case.

According to an embodiment of the invention, the valve further comprises: a valve body, the valve body comprising: a portion defining a cylindrical inner wall in which the cylindrical portion of the spool is slidably fitted; and a valve seat in which a guide wall of the spool is slidably fitted.

According to an embodiment of the present invention, the portion of the valve body that defines the cylindrical inner wall is a sleeve, the inner wall of the sleeve constituting the cylindrical inner wall. With the valve cartridge and the valve according to embodiments of the present invention, for example, the operability of the valve can be improved.

Drawings

Embodiments of the invention are described in more detail below, by way of example, with reference to the accompanying drawings, in which:

fig. 1 is a schematic front cross-sectional view of a valve according to an embodiment of the invention;

fig. 2 is a schematic side cross-sectional view of a valve according to an embodiment of the invention;

fig. 3 is a schematic front view of a valve cartridge of a valve according to an embodiment of the present invention;

fig. 4 is a schematic cross-sectional view of a valve cartridge of a valve according to an embodiment of the present invention;

fig. 5 is a schematic top view of a valve cartridge of a valve according to an embodiment of the present invention; and

fig. 6 is a schematic perspective view of a valve cartridge of a valve according to an embodiment of the present invention.

Detailed Description

Referring to fig. 1 to 6, a valve 100 according to an embodiment of the present invention includes a valve cartridge 1 and a valve body 2. The valve body 2 includes: a portion defining a cylindrical inner wall in which the cylindrical portion 11 of the valve cartridge 1 is slidably fitted. The valve body 2 further includes a valve seat 22, and the guide wall 12 of the spool 1 is slidably fitted in the valve seat 22. According to an example of the present invention, the portion of the valve body 2 defining the cylindrical inner wall is a sleeve 21, and the inner wall of the sleeve 21 constitutes the cylindrical inner wall. The cylindrical portion 11 of the spool 1 is slidably fitted in the sleeve 21. The valve body 2 further comprises an inlet pipe 23 and an outlet pipe 24. The valve 100 further includes a valve rod 3, one end of the valve rod 3 is connected to the valve core 1, and the other end extends out of the valve body 2. The valve body 2 further includes: a cylindrical fixing portion 25 in which the sleeve 21 is disposed; and a valve body cover 26, the valve body cover 26 being fixed to the cylindrical fixing portion 25 to seal the cylindrical fixing portion 25 and the opening of the sleeve 21. It should be noted that, in some embodiments of the present invention, as described above, the sleeve 21 may be formed by a part of the valve body 2, for example, the cylindrical fixing portion 25, or the sleeve 21 may be integrally formed with the cylindrical fixing portion 25 or the valve body cover 26. The fixing portion 25 may have other shapes, not limited to the cylindrical shape. A seal groove is provided on the inner peripheral surface of the sleeve 21, and a seal is provided in the seal groove to form a sealing engagement between the sleeve 21 and the cylindrical portion 11. The sleeve 21 and the cylindrical portion 11 constitute a guide mechanism to guide the valve element 1. As shown in fig. 1 and 2, the valve body 1 is moved in the sleeve 21 and the valve seat 22 by the valve stem 3. The guide wall 12 moves in the valve seat 22 over the entire operating stroke or a part of the operating stroke of the valve cartridge 1 to guide the valve cartridge 1. Referring to fig. 1 and 2, when the valve 100 is open, media flows from the inlet pipe 23 through the flow passage 16 to the outlet pipe 24.

Referring to fig. 1 to 6, a valve cartridge 1 according to an embodiment of the present invention includes: a barrel portion 11, the barrel portion 11 defining an internal cavity and having first and

second ends

111, 112 opposite in an axial direction; a partition wall 13 within the cylindrical portion 11 and at the second end 112 of the cylindrical portion 11; a pressure taking hole 14 that communicates the inner cavity of the cylindrical portion 11 with the outside of the inner cavity; a guide wall 12 extending from the second end 112 of the cylindrical portion 11 toward a side away from the first end 111 of the cylindrical portion 11; and a flow passage 16, the flow passage 16 communicating one side of the guide wall 12 toward the axis of the cylindrical portion 11 with the other side away from the axis of the cylindrical portion 11. For example, the flow passage 16 communicates the inner portion in the radial direction of the guide wall 12 with the outer portion in the radial direction. The guide wall 12 may extend from the second end 112 of the cylindrical portion 11 in the axial direction of the cylindrical portion 11.

According to an embodiment of the present invention, referring to fig. 1, 4, 5, and 6, the pressure tapping hole 14 may penetrate the partition wall 13, and referring to fig. 1, 3, 4, 5, and 6, the flow passage 16 may penetrate the guide wall 12. According to an embodiment of the present invention, the pressure tapping hole 14 may communicate the inner cavity of the cylindrical portion 11 with the valve element outer space 27 of the inner cavity on the side away from the first end 111 of the cylindrical portion 11. The spool exterior space 27 may be a space above the inner cavity of the cylindrical portion 11 in fig. 1 and 2. For example, referring to fig. 1 to 6, the spool exterior space 27 may be a space above the first flow passage wall portion 161, the partition wall 13, the annular protrusion 18.

Referring to fig. 3 to 6, in an embodiment of the present invention, the flow channel wall 160 of the flow channel 16 includes: the first channel wall portion 161 and the two second channel wall portions 162 respectively located on both sides of the first channel wall portion 161 in the width direction of the channel 16 are arranged such that, in the axial direction of the cylindrical portion 11, the first channel wall portion 161 is closer to the first end 111 of the cylindrical portion 11 than the second channel wall portion 162, and the second channel wall portion 162 extends from the first channel wall portion 161 toward a side of the first channel wall portion 161 away from the first end 111 of the cylindrical portion 11. In the embodiment shown in fig. 1 to 6, the first flow channel wall portion 161 constitutes a bottom wall of the flow channel 16, the second flow channel wall portion 162 constitutes a side wall of the flow channel 16, and a distance between the two side walls constitutes a width of the flow channel 16.

Referring to fig. 3 to 6, in the embodiment of the present invention, at least a portion of the pressure taking hole 14 extends from the first flow passage wall portion 161 to the inner cavity of the cylindrical portion 11. For example, the pressure-taking hole 14 extends from the first flow passage wall portion 161 to the inner cavity of the cylindrical portion 11 through the cylindrical portion 11, or the pressure-taking hole 14 extends from the first flow passage wall portion 161 to the inner cavity of the cylindrical portion 11 through the cylindrical portion 11 and the partition wall 13.

Referring to fig. 3 to 6, in the embodiment of the present invention, the pressure tapping hole 14 is located at a position where a surface 131 of the partition wall 13 away from the first end 111 of the cylindrical portion 11 meets the flow passage 16. According to an example of the present invention, the pressure taking hole 14 is located within a size range of the first flow path wall portion 161 in the width direction of the flow path 16. According to another example of the present invention, the pressure taking hole 14 is located within a range defined by a first point and a second point on both sides of the center of the first flow path wall portion 161 in the width direction of the flow path 16, and the distance between the first point and the second point and the center of the first flow path wall portion 161 in the width direction of the flow path 16 is 3.5 times the size of the first flow path wall portion 161.

Referring to fig. 4 to 6, in the embodiment of the present invention, a plurality of flow passages 16 (e.g., 3 flow passages 16) are uniformly distributed around the central axis of the valve core 1, a plurality of pressure taking holes 14 (e.g., 3 pressure taking holes 14) are uniformly distributed around the central axis of the valve core 1, and each of the plurality of pressure taking holes 14 is on the same radius as a corresponding one of the plurality of flow passages 16. The central angle corresponding to the pressure taking hole 14 is within the range of the central angle corresponding to the flow passage 16 with respect to the central axis of the partition wall 13.

Referring to fig. 3 to 6, in the embodiment of the present invention, in the axial direction of the cylindrical portion 11, the distance between the first flow passage wall portion 161 and the surface 131 of the partition wall 13 away from the first end 111 of the cylindrical portion 11 is less than or equal to 20 mm. In the embodiment shown in fig. 1 to 6, at least a part of the first flow passage wall portion 161 is located on the same plane as the surface 131 of the partition wall 13 remote from the first end 111 of the cylindrical portion 11. That is, in the embodiment shown in fig. 1 to 6, the bottom wall of the flow channel 16 may be higher than the surface 131 of the partition wall 13, the height difference between the bottom wall of the flow channel 16 and the surface 131 of the partition wall 13 is less than 20 mm, or the bottom wall of the flow channel 16 and the surface 131 of the partition wall 13 are located on the same plane. In other embodiments, the bottom wall of the flow channel 16 may be lower than the surface 131 of the partition wall 13, and the height difference between the bottom wall of the flow channel 16 and the surface 131 of the partition wall 13 is less than 20 mm, or may be an inclined bottom wall, and the flow channel 16 extends into the cylindrical portion 11.

Referring to fig. 4 to 6, in the embodiment of the present invention, in the radial direction of the cylindrical portion 11, the distance between the pressure taking hole 14 and the flow passage 16 is smaller than the distance between the pressure taking hole and the central axis of the partition wall 13. In other words, the radial distance of the pressure taking hole 14 from the flow passage 16 is smaller than the radial distance from the center axis of the partition wall 13, or the radial distance of the pressure taking hole 14 from the outer circumference of the partition wall 13 is smaller than the radial distance from the center axis of the partition wall 13. For example, the distance of the pressure taking hole 14 from the center axis of the partition wall 13 in the radial direction of the cylindrical portion 11 is in the range of 80% to 100% of the radius of the partition wall 13.

According to an embodiment of the present invention, referring to fig. 1 to 6, the valve cartridge 1 further includes an annular protrusion 18 surrounding the outer periphery of the cylindrical portion 11. The annular projection 18 is brought into contact with and separated from an end surface facing the axial direction of the annular valve seat 22 of the valve body 2 or a surface facing the axial direction of an annular step formed on the end surface of the annular valve seat 22 to open and close the valve or to adjust the degree of opening of the valve.

According to an embodiment of the present invention, at least a portion of the pressure tapping hole 14 extends from a surface of the annular protrusion 18 away from the first end 111 of the cylindrical portion 11 to an inner cavity of the cylindrical portion 11. For example, the pressure-taking hole 14 extends from the surface of the annular protrusion 18 away from the first end 111 of the cylindrical portion 11 to the inner cavity of the cylindrical portion 11 through the annular protrusion 18 and the cylindrical portion 11, or the pressure-taking hole 14 extends from the surface of the annular protrusion 18 away from the first end 111 of the cylindrical portion 11 to the inner cavity of the cylindrical portion 11 through the annular protrusion 18, the cylindrical portion 11 and the partition wall 13.

According to the utility model discloses an embodiment, the case can adopt common material to make, covers the lubricating coating on the outer peripheral face of barrel-shaped part 11 of case 1 at least, also can be at whole case surface coating lubricating coating. Can effectively prevent corrosion, reduce friction coefficient and reduce motion resistance. The lubricious coating may be polytetrafluoroethylene.

Referring to fig. 1 and 2, the cylindrical portion 11 of the spool 1, the sleeve 21 of the valve body 2, the cylindrical fixing portion 25, and the valve body cover 26 form a spool internal space 17, and the spool internal space 17 communicates with a spool external space 27 through the pressure taking hole 14 in the partition wall 13 of the spool 1. The pressure in the valve core external space 27 is introduced into the valve core internal space 17, so that the pressure difference between the inside of the valve core and the outside of the valve core is reduced, and the valve core has a balance function. Therefore, the pressures received by the valve core are balanced, and a larger working pressure difference is driven by using smaller driving force. The desired balance cannot be achieved with either too much or too little pressure being introduced into the valve core interior space 17. For example: the introduced pressure is too large, so that the force applied to the inner part of the valve core is larger than the force applied to the outer part of the valve core, and the working force of the valve is increased; or the pressure introduced is too low, resulting in the force experienced inside the valve spool being less than the force experienced outside the valve spool, also increasing the working force of the valve. Because the surface 131 of the partition wall 13 is located in the medium flow, the pressure applied decreases gradually from the center to the periphery, when the pressure taking hole 14 is located closer to the center, the pressure applied to the inner space 17 of the valve element is too large, the force applied to the inner surface of the valve element is larger than the force applied to the outer surface of the valve element, which causes the imbalance of the external force in the valve element and increases the working force of the valve.

The inventors found that a difference in height between the bottom wall 161 of the flow channel 16 and the surface 131 of the partition wall 13 generates a pressure difference, and at the same time, if the bottom wall 161 of the flow channel 16 is higher than the surface 131 of the partition wall 13, a vortex is generated at the surface 131 of the partition wall 13. The inventors have also found that when the bottom wall 161 of the flow channel 16 is lower than the surface 131 of the partition wall 13, a vortex is generated in the bottom wall 161 of the flow channel 16. The generation of the vortex further increases the pressure difference between the bottom wall 161 of the flow passage 16 and the surface 131 of the partition wall 13. The pressure difference is increased, so that the pressure introduced by the valve core pressure taking hole 14 is increased, the force applied to the inner surface of the valve core is larger than the force applied to the outer surface of the valve core, the imbalance of the internal force and the external force in the valve core is caused, and the working force of the valve is increased. Meanwhile, the eddy current can generate adverse effect on the flow, increase the unstable factors of the system, damage parts and shorten the service life of the product.

The inventors have made extensive studies and found that when the height difference between the bottom wall 161 of the flow passage 16 and the surface 131 of the partition wall 13 is less than 20 mm, the eddy current can be reduced so that the difference between the force applied to the inner surface of the spool and the force applied to the outer surface of the spool is at an appropriate level. When the bottom wall of the flow passage 16 and the surface 131 of the partition wall 13 are located on the same plane, the eddy current can be reduced to the maximum extent, the pressure difference between the inside and the outside of the valve core can be reduced, the valve core has a balance function, and the working force of the valve can be reduced.

Since the shape of the flow path affects the flow rate profile, the difference in height between the bottom wall 161 of the flow path 16 and the surface 131 of the partition wall 13 is less than 20 mm, and the influence of the flow path shape on the flow rate profile of the same stroke can be reduced.

According to the utility model discloses an embodiment enables the effort that case internal surface received and equals the effort that the surface received to reduce the valve at the required drive power of during operation. In addition, the surface of the valve core is covered with lubricating coating, so that the corrosion can be effectively prevented, the friction coefficient is reduced, and the motion resistance is reduced.

Claims

1. A valve cartridge for a valve, comprising:

a barrel portion defining an internal cavity and having first and second ends opposite in an axial direction;

a dividing wall within the barrel portion and at the second end of the barrel portion;

a pressure taking hole communicating an inner cavity of the cylindrical portion with an outside of the inner cavity;

a guide wall extending from the second end of the cylindrical portion toward a side away from the first end of the cylindrical portion; and

a flow passage communicating one side of the guide wall toward the axis of the cylindrical portion with the other side away from the axis of the cylindrical portion.

2. The valve cartridge for a valve according to claim 1, wherein:

the flow passage penetrates through the guide wall.

3. The valve cartridge for a valve according to claim 1, wherein:

the pressure taking hole penetrates through the partition wall.

4. The valve cartridge for a valve according to claim 1, wherein:

the runner wall of the runner includes: the first flow passage wall portion is closer to the first end of the cylindrical portion than the second flow passage wall portion in the axial direction of the cylindrical portion, and the two second flow passage wall portions are respectively located on both sides of the first flow passage wall portion in the width direction of the flow passage, the second flow passage wall portion extending from the first flow passage wall portion toward a side of the first flow passage wall portion away from the first end of the cylindrical portion.

5. The valve cartridge for a valve according to claim 4, wherein:

at least a portion of the pressure tap bore extends from the first flow passage wall portion to the interior cavity of the cylindrical portion.

6. The valve cartridge for a valve according to claim 1, wherein:

the pressure taking hole is positioned at the position where the surface of the first end of the partition wall, which is far away from the cylindrical part, meets the flow passage.

7. The valve cartridge for a valve according to claim 4, wherein:

the pressure-taking hole is located within a size range of the first flow passage wall portion in the width direction of the flow passage.

8. The valve cartridge for a valve according to claim 4, wherein:

the pressure taking hole is located in a range defined by a first point and a second point on both sides of the center of the first flow channel wall portion in the width direction of the flow channel, and the first point and the second point are each 3.5 times the size of the first flow channel wall portion from the center of the first flow channel wall portion in the width direction of the flow channel.

9. The valve cartridge for a valve according to claim 4, wherein:

the first flow passage wall portion is spaced from a surface of the partition wall, which is away from the first end of the cylindrical portion, by a distance of 20 mm or less in an axial direction of the cylindrical portion.

10. The valve cartridge for a valve according to claim 4, wherein:

at least a portion of the first flow passage wall portion is in the same plane as a surface of the partition wall remote from the first end of the cylindrical portion.

11. The valve cartridge for a valve according to claim 1, wherein:

the pressure taking hole is located at a distance from the flow passage smaller than a distance from a center axis of the partition wall in a radial direction of the cylindrical portion.

12. The valve cartridge for a valve according to claim 3, wherein:

the pressure taking hole is located at a distance from the center axis of the partition wall in a range of 80% to 100% of the radius of the partition wall in the radial direction of the cylindrical portion.

13. The valve cartridge for a valve according to claim 1, further comprising:

an annular protrusion surrounding an outer periphery of the cylindrical portion, at least a portion of the pressure tap hole extending from a surface of the annular protrusion distal from the first end of the cylindrical portion to an inner cavity of the cylindrical portion.

14. The valve cartridge for a valve according to claim 1, further comprising:

a lubricating coating material covering at least the outer peripheral surface of the cylindrical portion.

15. The valve cartridge for a valve according to claim 14, wherein:

the lubricious coating comprises polytetrafluoroethylene.

16. The valve cartridge for a valve according to claim 1, wherein:

the pressure taking hole enables the inner cavity of the cylindrical part to be communicated with the outer space of the valve core on the side, far away from the first end of the cylindrical part, of the inner cavity.

17. The valve cartridge for a valve according to claim 1, wherein:

the guide wall extends from the second end of the cylindrical portion in an axial direction of the cylindrical portion.

18. A valve, characterized by comprising:

a valve trim according to any of claims 1 to 17.

19. The valve of claim 18, further comprising:

a valve body, the valve body comprising: a portion defining a cylindrical inner wall in which the cylindrical portion of the spool is slidably fitted; and a valve seat in which a guide wall of the spool is slidably fitted.

20. The valve of claim 19, wherein:

the portion of the valve body defining the cylindrical inner wall is a sleeve, the inner wall of the sleeve constituting the cylindrical inner wall.