CN212959812U - Piston assembly and solenoid valve with same - Google Patents

Abstract

The utility model provides a piston assembly and have its solenoid valve, piston assembly includes: the piston is provided with a first communication port, a second communication port and a first communication channel communicated with the first communication port and the second communication port; the valve core is movably arranged in the first communication channel, the valve core is provided with a main body part and a sealing part, the sealing part is arranged on the main body part, the sealing part faces the second communication port, the section size of the main body part is larger than that of the first communication port, and the section size of the main body part is smaller than that of the second communication port; and the pilot valve port seat is arranged at the second communication port, a second communication channel is arranged on the pilot valve port seat, the second communication channel is communicated with the second communication port, and the sealing part is used for plugging the second communication channel. Through the technical scheme provided by the utility model, the unstable technical problem of case assembly of the piston assembly among the prior art can be solved.

Description

Piston assembly and solenoid valve with same

Technical Field

The utility model relates to a solenoid valve technical field particularly, relates to a piston assembly and have its solenoid valve.

Background

At present, a two-way solenoid valve in the prior art includes a piston having a balance hole and a spool accommodating chamber, which are communicated through a seal port. The valve core accommodating cavity is movably provided with a valve core, the top of the valve core is provided with a sealing surface for plugging a sealing port, and the main body part of the valve core is provided with a central through hole arranged along the axial direction of the main body part and at least one radial hole communicated with the valve core accommodating cavity and the central through hole. The valve core accommodating cavity is a straight cylindrical cavity, the main body part of the valve core comprises an upper part and a lower part of which the diameter is larger than that of the upper part, wherein the lower part of the main body part is used for being tightly matched with the inner wall of the valve core accommodating cavity, and the radial hole is arranged on the upper part. By adopting the structure, when the valve core is generally installed, the valve core is plugged into the straight cylindrical cavity from the bottom of the straight cylindrical cavity, and the flanging at the bottom of the piston is pressed down so as to position the valve core through the bent flanging.

However, the structural arrangement and the installation mode are adopted, so that the flanging in the installation process can be uneven or the assembly is inclined. Therefore, when the valve core acts and impacts to the bent flanging, the flanging is possibly invalid, so that the valve core falls out of the straight cylindrical cavity, and further faults are caused.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides a piston assembly and have its solenoid valve to solve the unstable technical problem of piston assembly's among the prior art case assembly.

In order to achieve the above object, according to an aspect of the present invention, there is provided a piston assembly including: the piston is provided with a first communication port, a second communication port and a first communication channel communicated with the first communication port and the second communication port; the valve core is movably arranged in the first communication channel, the valve core is provided with a main body part and a sealing part, the sealing part is arranged on the main body part, the sealing part faces the second communication port, the section size of the main body part is larger than that of the first communication port, and the section size of the main body part is smaller than that of the second communication port; and the pilot valve port seat is arranged at the second communication port, a second communication channel is arranged on the pilot valve port seat, the second communication channel is communicated with the second communication port, and the sealing part is used for plugging the second communication channel.

Further, at least a portion of the pilot valve port seat is in interference fit or threaded connection with the second communication port.

Further, the pilot valve seat includes: the first seat body is arranged in the second communicating port, and the first seat body is connected with the second communicating port through interference or threads; the second seat body is arranged on the first seat body and is positioned on one side of the first seat body, which is far away from the valve core, and the second communicating channel penetrates through the first seat body and the second seat body.

Further, a positioning structure is arranged in the first communication channel so as to be abutted and positioned with the pilot valve port seat through at least part of the positioning structure.

Furthermore, the first communicating channel comprises a first communicating section, a second communicating section, a third communicating section and a fourth communicating section which are sequentially communicated, a first communicating port is formed at one end, far away from the second communicating section, of the first communicating section, and a second communicating port is formed at one end, far away from the third communicating section, of the fourth communicating section; a limiting step is formed between the first communicating section and the second communicating section and used for limiting the main body part; the flow area of the third communicating section is larger than that of the second communicating section, a positioning step is formed between the third communicating section and the fourth communicating section, and the positioning step is used for abutting and positioning the pilot valve port seat.

Further, the pilot valve mouth seat includes first pedestal and the second pedestal that connects gradually, and first pedestal sets up in the fourth intercommunication section, and the height of first pedestal is less than the height of first intercommunication section.

Furthermore, a liquid flowing cavity is further arranged on the piston, the liquid flowing cavity is arranged at one end, far away from the third communicating section, of the fourth communicating section, the liquid flowing cavity is communicated with the fourth communicating section, the flow area of the liquid flowing cavity is larger than that of the fourth communicating section, and the height of the second seat body is smaller than that of the liquid flowing cavity.

Furthermore, a third communicating channel is further arranged on the piston, the third communicating channel and the first communicating channel are arranged at intervals, one end of the third communicating channel is communicated with the liquid walking cavity, and the other end of the third communicating channel is used for being communicated with the outside.

Further, the pilot valve port seat further comprises: and the third seat body is arranged at one end of the first seat body, which is far away from the second seat body, and the third seat body is attached to the inner wall of the third communicating section.

Furthermore, the third communicating section is connected with the fourth communicating section through a first conical surface, and the conical vertex angle corresponding to the first conical surface is alpha; the third seat body is connected with the first seat body through a second conical surface, and the corresponding conical vertex angle of the second conical surface is beta; wherein α > β.

Further, the piston assembly further comprises: a seal disposed between the piston and the pilot valve seat.

Further, the piston assembly further comprises: and the annular bulge is arranged on the positioning step and protrudes out of the positioning step, and the annular bulge is used for sealing the end face of the pilot valve port seat.

According to the utility model discloses an on the other hand provides a solenoid valve, and the solenoid valve includes: a valve seat having a receiving cavity; the piston assembly is arranged in the accommodating cavity and is the piston assembly provided by the above.

Use the technical scheme of the utility model, cross sectional dimension through making the main part is greater than the cross sectional dimension of first intercommunication mouth, the cross sectional dimension of main part is less than the cross sectional dimension of second intercommunication mouth, like this, can install the case to the first intercommunication passageway of piston in from second intercommunication mouth, afterwards, set up pilot valve mouth seat in second intercommunication mouth department, restrict the home range of case in first intercommunication passageway through first intercommunication mouth and pilot valve mouth seat, improve the stability that sets up of case, avoid the case to play from first intercommunication passageway. The sealing part is used for plugging the second communicating channel so as to enable the first communicating channel and the second communicating channel to be communicated or separated, thereby being convenient for controlling the flowing direction of the liquid. Therefore, the technical problem that the valve core of the piston assembly in the prior art is unstable to assemble can be solved through the technical scheme provided by the invention.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural diagram of a piston assembly provided with an annular protrusion according to an embodiment of the present invention;

fig. 2 shows a schematic structural diagram of a piston assembly provided with a sealing member according to an embodiment of the present invention;

fig. 3 shows a schematic structural diagram of a piston assembly according to an embodiment of the present invention;

fig. 4 shows a schematic structural diagram of a piston assembly according to a second embodiment of the present invention;

fig. 5 shows a schematic structural diagram of a piston according to a second embodiment of the present invention;

FIG. 6 illustrates a cross-sectional view of a pilot valve seat provided in accordance with a second embodiment of the present invention;

fig. 7 shows a schematic structural diagram of a solenoid valve according to a third embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a piston; 11. a first communication port; 12. a second communication port; 13. a first communication section; 14. a second communicating section; 15. a third communicating section; 16. a fourth communication section; 17. a liquid feeding cavity; 18. a third communicating passage; 19. a first conical surface; 20. a valve core; 21. a main body portion; 22. a sealing part; 30. a pilot valve port seat; 31. a second communicating passage; 32. a first seat body; 33. a second seat body; 34. a third seat body; 35. a second tapered surface; 40. a limiting step; 50. positioning a step; 60. a seal member; 70. an annular projection; 80. a valve seat; 90. flanging; 100. a first connecting pipe; 110. a second connecting pipe; 130. a snap ring; 140. a steel ball; 150. a core iron; 160. a core iron spring; 170. a conduit; 180. an attractor; 190. a piston spring.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1-3, an embodiment of the present invention provides a piston assembly including a piston 10, a valve spool 20, and a pilot valve seat 30. The piston 10 is provided with a first communication port 11, a second communication port 12, and a first communication passage communicating with both the first communication port 11 and the second communication port 12. The valve core 20 is movably arranged in the first communication channel, the valve core 20 is provided with a main body part 21 and a sealing part 22, the sealing part 22 is arranged on the main body part 21, the sealing part 22 is arranged towards the second communication port 12, the cross-sectional size of the sealing part 22 is smaller than the size of the false surface of the main body part 21, and the main body part 21 can be of a cylindrical structure. The main body portion 21 has a cross-sectional dimension larger than that of the first communication port 11, and the main body portion 21 has a cross-sectional dimension smaller than that of the second communication port 12. The pilot valve seat 30 is provided at the second communication port 12, a second communication passage 31 is provided in the pilot valve seat 30, the second communication passage 31 communicates with the second communication port 12, and the seal portion 22 is used to block the second communication passage 31. The piston 10 and the pilot valve seat 30 in this embodiment are two distinct components, and the pilot valve seat 30 is mounted to the piston 10 during a particular installation.

With the piston assembly provided by the present embodiment, during installation, the valve core 20 can be plugged into the first communication channel from the second communication port 12, and then the pilot valve seat 30 is disposed at the second communication port 12, so as to stably limit the movement range of the piston 10 through the first communication port 11 and the pilot valve seat 30, thereby avoiding the situation that the valve core 20 escapes from the first communication channel, and ensuring the assembly stability of the valve core 20. Therefore, the piston assembly provided by the embodiment can solve the technical problem that the valve core 20 of the piston assembly in the prior art is unstable in assembly.

For more stable restriction of the movement of the valve spool 20, at least a portion of the pilot port seat 30 in the present embodiment is connected with the second communication port 12 by interference fit or screw thread. By adopting the arrangement, the arrangement stability of the pilot valve port seat 30 can be improved, the position deviation of the pilot valve port seat 30 in the use process is avoided, and the movement range of the valve core 20 is further effectively limited.

Specifically, the inner wall of the valve core 20 in this embodiment is provided with an axially extending blind hole and a radially extending through hole, and the radially extending through hole is communicated with both the first communication channel and the blind hole.

Specifically, the pilot valve seat 30 in the present embodiment includes a first seat body 32 and a second seat body 33, the first seat body 32 is disposed in the second communication port 12, and the first seat body 32 and the second communication port 12 are connected by interference or screw threads. The second seat 33 is disposed on the first seat 32, the second seat 33 is located on a side of the first seat 32 away from the valve core 20, and the second communicating channel 31 penetrates through the first seat 32 and the second seat 33. With such a configuration, the first seat 32 can improve the stability of the installation of the pilot valve seat 30, and the second seat 33 can facilitate connection with other components. Specifically, the cross-sectional dimension of the second fastening structure 33 is smaller than the cross-sectional dimension of the first fastening structure 32.

In this embodiment, a positioning structure is provided in the first communicating channel to perform abutting positioning with the pilot valve port seat 30 through at least a part of the positioning structure, so that the setting stability of the pilot valve port seat 30 can be improved, and the setting stability of the whole structure is improved.

Specifically, the first communicating channel in this embodiment includes a first communicating section 13, a second communicating section 14, a third communicating section 15 and a fourth communicating section 16 which are communicated in sequence, one end of the first communicating section 13, which is far away from the second communicating section 14, forms a first communicating port 11, and one end of the fourth communicating section 16, which is far away from the third communicating section 15, forms a second communicating port 12. Wherein, a limiting step 40 is formed between the first communicating section 13 and the second communicating section 14, and the limiting step 40 is used for limiting the main body part 21. The flow area of the third communicating section 15 is larger than that of the second communicating section 14, a positioning step 50 is formed between the third communicating section 15 and the fourth communicating section 16, and the positioning step 50 is used for abutting and positioning the pilot valve port seat 30. By adopting the structure, the limiting stability of the valve core 20 can be improved through the limiting of the positioning step 50 and the limiting step 40, and the condition that the valve core 20 is separated from the first communication channel is better avoided. The structure that adopts four intercommunication sections to connect sets up, also can make the atress of first intercommunication opening 11 little, is difficult to the fracture.

In the present embodiment, the pilot valve seat 30 includes a first seat body 32 and a second seat body 33 connected in sequence, the first seat body 32 is disposed in the fourth communication section 16, and the height of the first seat body 32 is smaller than that of the first communication section 13. Specifically, the height difference H between the upper edge of the first seat 32 and the upper edge of the fourth communicating section 16 is as indicated by the reference numeral, and with such a structural arrangement, it is convenient to press the end face of the end of the fourth communicating section 16 during installation, so as to fix the pilot valve port seat 30.

Specifically, the end face of the end portion of the fourth communicating section 16 of the liquid flowing cavity 17, which is also arranged on the piston 10, is the bottom face of the liquid flowing cavity 17, the liquid flowing cavity 17 is arranged at one end of the fourth communicating section 16, which is far away from the third communicating section 15, the liquid flowing cavity 17 is communicated with the fourth communicating section 16, the flow area of the liquid flowing cavity 17 is larger than that of the fourth communicating section 16, and the height of the second seat body 33 is smaller than that of the liquid flowing cavity 17.

In this embodiment, the piston 10 is further provided with a third communicating channel 18, the third communicating channel 18 is spaced from the first communicating channel, one end of the third communicating channel 18 is communicated with the liquid-feeding cavity 17, and the other end of the third communicating channel 18 is used for communicating with the outside. By adopting the structure, different liquid flowing directions are convenient to realize, so that bidirectional flow is realized.

Specifically, the piston assembly further includes a seal 60, the seal 60 being disposed between the piston 10 and the pilot valve port seat 30 to enhance the sealing performance between the piston 10 and the pilot valve port seat 30. In particular, the seal 60 may be an annular gasket.

Specifically, the piston assembly may further include an annular protrusion 70, the annular protrusion 70 is disposed on the positioning step 50, the annular protrusion 70 is disposed to protrude from the positioning step 50, and the annular protrusion 70 is used for sealing the end surface of the pilot valve seat 30. With this arrangement, a ring seal structure is formed by the annular protrusion 70 and the end surface of the pilot valve port seat 30 to ensure a sealing effect.

In order to further improve the stability of the arrangement of the pilot valve port seat 30, a flange 90 may be provided at the edge of the second communication port 12, and the flange 90 has an annular structure. After the pilot valve seat 30 is in interference fit or threaded connection with the second communication port 12, the flange 90 may be bent to further improve the stability of the pilot valve seat 30.

As shown in fig. 4 to 6, a second embodiment of the present invention provides a piston assembly, and the difference between the piston assembly of the second embodiment and the piston assembly of the first embodiment is the structure of the pilot valve seat 30. In this embodiment, the pilot valve seat 30 includes a first seat 32, a second seat 33 and a third seat 34, the third seat 34 is disposed at an end of the first seat 32 away from the second seat 33, and the third seat 34 is attached to an inner wall of the third communicating portion 15. With this arrangement, the sealing performance can be further improved, and leakage of liquid from between the pilot valve seat 30 and the piston 10 can be prevented.

Specifically, in the present embodiment, the third communicating section 15 and the fourth communicating section 16 are connected by a first conical surface 19, and a conical vertex angle corresponding to the first conical surface 19 is α; the third seat 34 is connected with the first seat 32 through a second taper surface 35, and the corresponding taper angle of the second taper surface 35 is beta; wherein α > β. With such a structural arrangement, it is possible to facilitate installation of the pilot valve port seat 30, so that the pilot valve port seat 30 is conveniently installed into the first flow passage, facilitating installation.

As shown in fig. 7, the third embodiment of the present invention provides a solenoid valve, the solenoid valve includes a valve seat 80 and a piston assembly, and the valve seat 80 has an accommodating cavity. The piston assembly is arranged in the accommodating cavity and is provided in the first embodiment.

In this embodiment, the solenoid valve further includes a first connection port and a second connection port disposed on the valve seat 80, an extending direction of the first connection port is perpendicular to an extending direction of the second connection port, the first connection pipe 100 is disposed at the first connection port, and the second connection pipe 110 is disposed at the second connection port. The solenoid valve further includes a snap ring 130, a steel ball 140, a core iron 150, a core iron spring 160, a conduit 170, an attractor 180, and a piston spring 190.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the stability of setting up of case is improved, avoids the case to drop from first communicating channel, has improved the stability of case effect.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. A piston assembly, comprising:

the piston (10) is provided with a first communication port (11), a second communication port (12) and a first communication channel communicated with the first communication port (11) and the second communication port (12);

a valve element (20) movably disposed in the first communication passage, the valve element (20) having a main body portion (21) and a sealing portion (22), the sealing portion (22) being disposed on the main body portion (21), the sealing portion (22) being disposed toward the second communication port (12), a cross-sectional dimension of the main body portion (21) being larger than a cross-sectional dimension of the first communication port (11), a cross-sectional dimension of the main body portion (21) being smaller than a cross-sectional dimension of the second communication port (12);

and the pilot valve port seat (30) is arranged at the second communication port (12), a second communication channel (31) is arranged on the pilot valve port seat (30), the second communication channel (31) is communicated with the second communication port (12), and the sealing part (22) is used for plugging the second communication channel (31).

2. Piston assembly according to claim 1, wherein at least part of the pilot valve port seat (30) is connected with the second communication port (12) by interference fit or screw thread.

3. The piston assembly of claim 2, wherein the pilot valve seat (30) comprises:

the first seat body (32) is arranged in the second communication port (12), and the first seat body (32) is in interference or threaded connection with the second communication port (12);

the second seat body (33) is arranged on the first seat body (32), the second seat body (33) is positioned on one side, away from the valve core (20), of the first seat body (32), and the second communication channel (31) penetrates through the first seat body (32) and the second seat body (33).

4. A piston assembly according to claim 1, wherein a locating formation is provided in the first communication channel for locating in abutment with the pilot valve seat (30) by at least part of the locating formation.

5. The piston assembly according to claim 4, characterized in that the first communication passage comprises a first communication section (13), a second communication section (14), a third communication section (15) and a fourth communication section (16) which are communicated in sequence, wherein one end of the first communication section (13) far away from the second communication section (14) forms the first communication port (11), and one end of the fourth communication section (16) far away from the third communication section (15) forms the second communication port (12);

a limiting step (40) is formed between the first communicating section (13) and the second communicating section (14), and the limiting step (40) is used for limiting the main body part (21); the flow area of the third communication section (15) is larger than that of the second communication section (14), a positioning step (50) is formed between the third communication section (15) and the fourth communication section (16), and the positioning step (50) is used for abutting and positioning the pilot valve port seat (30).

6. The piston assembly according to claim 5, characterized in that the pilot valve port seat (30) comprises a first seat body (32) and a second seat body (33) connected in sequence, the first seat body (32) being disposed in the fourth communication section (16), the first seat body (32) having a height smaller than the first communication section (13).

7. The piston assembly according to claim 6, characterized in that a liquid flowing cavity (17) is further arranged on the piston (10), the liquid flowing cavity (17) is arranged at one end, away from the third communicating section (15), of the fourth communicating section (16), the liquid flowing cavity (17) is communicated with the fourth communicating section (16), the flowing area of the liquid flowing cavity (17) is larger than that of the fourth communicating section (16), and the height of the second seat body (33) is smaller than that of the liquid flowing cavity (17).

8. The piston assembly as claimed in claim 7, characterized in that a third communicating channel (18) is further arranged on the piston (10), the third communicating channel (18) is arranged at a distance from the first communicating channel, one end of the third communicating channel (18) is communicated with the liquid-feeding cavity (17), and the other end of the third communicating channel (18) is used for being communicated with the outside.

9. The piston assembly of claim 6, wherein said pilot valve seat (30) further comprises:

and the third seat body (34) is arranged at one end, far away from the second seat body (33), of the first seat body (32), and the third seat body (34) is attached to the inner wall of the third communicating section (15).

10. The piston assembly according to claim 9, characterized in that the third communicating section (15) and the fourth communicating section (16) are connected by a first conical surface (19), and the first conical surface (19) has a corresponding cone apex angle α; the third seat body (34) is connected with the first seat body (32) through a second conical surface (35), and the corresponding conical vertex angle of the second conical surface (35) is beta; wherein α > β.

11. The piston assembly of claim 1, further comprising:

a seal (60) disposed between the piston (10) and the pilot valve seat (30).

12. The piston assembly of claim 5, further comprising:

the annular protrusion (70) is arranged on the positioning step (50), the annular protrusion (70) protrudes out of the positioning step (50), and the annular protrusion (70) is used for sealing the end face of the pilot valve port seat (30).

13. A solenoid valve, characterized in that it comprises:

a valve seat (80), the valve seat (80) having a receiving cavity;

a piston assembly disposed within the receiving chamber, the piston assembly being as claimed in any one of claims 1 to 12.

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