CN217301817U

CN217301817U - Pilot-operated electromagnetic valve

Info

Publication number: CN217301817U
Application number: CN202220682711.1U
Authority: CN
Inventors: 不公告发明人
Original assignee: Dunan Automotive Thermal Management Technology Co Ltd
Current assignee: Dunan Automotive Thermal Management Technology Co Ltd
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2022-08-26
Anticipated expiration: 2032-03-25
Also published as: WO2023179349A1

Abstract

The utility model provides a pilot operated solenoid valve, include: the valve body component comprises a valve seat and a valve cover which are connected with each other, the valve cover is provided with a first passage and a valve cavity, the valve seat is provided with an inlet cavity communicated with the valve cavity, and one end of the valve seat, which is far away from the valve cover, is provided with a second passage; a piston member movably disposed within the valve chamber to connect or disconnect the second passage and the inlet chamber; the piston component is provided with a third channel, and the first channel, the third channel and the second channel are communicated in sequence; the pilot valve part is connected with one end of the valve cover, which is far away from the valve seat, and is used for connecting or disconnecting the first passage and the valve cavity; the valve comprises a valve cover, a first guide part and a second guide part, wherein the first guide part is arranged on the valve cover, the second guide part is arranged on the piston component, and the first guide part and the second guide part are in guide fit. By adopting the scheme, the miniaturization of the integral structure of the pilot-operated electromagnetic valve is realized, the moving reliability of the piston part is improved, and the performance of the pilot-operated electromagnetic valve is ensured.

Description

Pilot-operated electromagnetic valve

Technical Field

The utility model relates to a solenoid valve technical field particularly, relates to a guide's formula solenoid valve.

Background

At present, for a pilot-operated solenoid valve in the prior art, a passage for communicating a valve cavity with an inlet cavity is arranged on the side wall of a valve seat, and in order to ensure the reliability of the valve seat, the size of the valve seat needs to be large, so that the pilot-operated solenoid valve cannot be miniaturized. Meanwhile, in the prior art, the piston component is easy to deflect in the process of moving in the valve cavity, so that the pilot-operated solenoid valve is blocked or fails.

SUMMERY OF THE UTILITY MODEL

The utility model provides a guide's formula solenoid valve to solve among the prior art guide's formula solenoid valve can not realize the miniaturization and the unreliable problem of piston part removal.

In order to solve the above problem, the utility model provides a guide's formula solenoid valve, include: the valve body component comprises a valve seat and a valve cover which are connected with each other, the valve cover is provided with a first passage and a valve cavity, the valve seat is provided with an inlet cavity communicated with the valve cavity, and one end of the valve seat, which is far away from the valve cover, is provided with a second passage; a piston member movably disposed within the valve chamber to connect or disconnect the second passage and the inlet chamber; the piston component is provided with a third channel, and the first channel, the third channel and the second channel are communicated in sequence; the pilot valve part is connected with one end of the valve cover, which is far away from the valve seat, and is used for connecting or disconnecting the first passage and the valve cavity; the valve comprises a valve cover, a first guide part and a second guide part, wherein the first guide part is arranged on the valve cover, the second guide part is arranged on the piston component, and the first guide part and the second guide part are in guide fit.

Further, the axes of the first channel, the second channel and the third channel are coincident, the axis of the valve cover is coincident with the axis of the piston part, and the axis of the first channel is coincident with the axis of the valve cover.

Furthermore, the first guide part is a first inserting column, the second guide part is a second inserting column, the first inserting column is located on one side, away from the pilot valve part, of the valve cover, the second inserting column is located on one side, facing the pilot valve part, of the piston part, and the first inserting column and the second inserting column are inserted.

Furthermore, the radial size of the first plug column is smaller than that of the second plug column, a fourth channel is arranged in the first plug column, a fifth channel communicated with the fourth channel is arranged in the second plug column, the first plug column is plugged in the fifth channel, the fourth channel is communicated with the first channel, and the fifth channel is communicated with the third channel.

Furthermore, a first sealing groove is formed in the side wall of one end, extending into the fifth channel, of the first inserting column, the pilot type electromagnetic valve further comprises a first sealing ring, the first sealing ring is arranged in the first sealing groove, and the first sealing ring is in sealing fit with the fifth channel.

Further, the piston component comprises a piston cylinder and an elastic part, the piston cylinder is movably arranged in the valve cavity, the third channel is arranged on the piston cylinder, a placing groove is formed in one side, facing the first channel, of the piston cylinder, the second guide part is connected with the bottom surface of the placing groove, the elastic part is arranged in the placing groove and is in limit fit with the inner wall of the placing groove, and two ends of the elastic part are respectively abutted to the valve cover and the piston cylinder; and the axis of the piston cylinder, the axis of the third channel and the axis of the second guide part are overlapped.

Further, the first guide part and the valve cover are of an integrated structure, and the second guide part and the piston cylinder are of an integrated structure.

Furthermore, the piston cylinder is provided with a first balance hole, two ends of the first balance hole are respectively communicated with the valve cavity and the inlet cavity, the side wall of the piston cylinder is further provided with a second sealing groove, the piston component further comprises a sealing ring, the sealing ring is arranged in the second sealing groove, and the sealing ring is in sealing fit with the inner wall of the valve cavity.

Furthermore, the piston component also comprises a blocking structure, the blocking structure is connected with one end of the piston cylinder facing the second channel, the blocking structure is provided with a blocking position and an avoiding position, under the condition that the blocking structure is at the blocking position, the blocking structure is abutted against the valve seat, and the second channel is disconnected from the inlet cavity; and under the condition that the blocking structure is in the avoiding position, the blocking structure is separated from the valve seat, and the second channel is communicated with the inlet cavity.

Furthermore, the valve cover is in threaded connection with the valve seat, one side of the valve cover, which is far away from the piston component, is provided with an annular bulge, the area inside the annular bulge forms a pilot valve cavity, the valve cover is provided with a second balance hole, and two ends of the second balance hole are respectively communicated with the pilot valve cavity and the valve cavity; and one part of the pilot valve part is positioned in the pilot valve cavity, and the pilot valve part is provided with a pilot valve port which can be opened and closed so as to connect or disconnect the first channel and the pilot valve cavity.

Use the technical scheme of the utility model, a guide's formula solenoid valve is provided, include: the valve body component comprises a valve seat and a valve cover which are connected with each other, the valve cover is provided with a first passage and a valve cavity, the valve seat is provided with an inlet cavity communicated with the valve cavity, and one end of the valve seat, which is far away from the valve cover, is provided with a second passage; a piston member movably disposed within the valve chamber to connect or disconnect the second passage and the inlet chamber; the piston component is provided with a third channel, and the first channel, the third channel and the second channel are communicated in sequence; the pilot valve part is connected with one end of the valve cover, which is far away from the valve seat, and is used for connecting or disconnecting the first passage and the valve cavity; the valve comprises a valve cover, a first guide part and a second guide part, wherein the first guide part is arranged on the valve cover, the second guide part is arranged on the piston component, and the first guide part and the second guide part are in guide fit. By adopting the scheme, the communication between the first channel and the valve cavity is realized through the pilot valve part, then the communication between the valve cavity and the second channel is realized through the third channel, the second channel is connected with an external pipeline, a pressure difference is formed between the second channel and the valve cavity, so that the pressure relief action is carried out on the piston part, the piston part moves to enable the second channel to be communicated with the inlet cavity, the communication between the inlet cavity and the third channel is further realized, the inlet cavity is connected with the inlet pipeline, and further the communication between the external pipeline and the inlet pipeline is realized. The first channel, the second channel and the third channel are arranged on the valve cover, the valve seat and the piston component respectively, and the valve cavity and the inlet cavity are communicated through the first channel, the third channel and the second channel which are communicated in sequence, so that the condition that the pilot-operated electromagnetic valve cannot be miniaturized as a whole due to the fact that the communicating channel of the valve cavity and the inlet cavity is arranged on the valve seat in the prior art is avoided, the miniaturization of the valve seat is achieved, and further the miniaturization of the integral structure of the pilot-operated electromagnetic valve is achieved. Meanwhile, the first guide part and the second guide part are arranged to guide the movement of the piston component, so that the situation that the piston component deviates in the moving process is prevented, the moving reliability of the piston component is improved, and the performance of the pilot-operated electromagnetic valve is ensured.

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 pilot-operated solenoid valve provided according to an embodiment of the present invention;

FIG. 2 illustrates a cross-sectional view of the pilot operated solenoid valve of FIG. 1;

FIG. 3 is a schematic structural view of the valve cover and the first guide portion of FIG. 2;

fig. 4 shows a schematic view of the piston member and the second guide portion of fig. 2.

Wherein the figures include the following reference numerals:

10. a valve body member; 11. a valve seat; 111. an inlet chamber; 112. a second channel; 12. a valve cover; 121. a first channel; 122. a valve cavity; 123. an annular projection; 124. a pilot valve cavity; 125. a second balance hole; 20. a piston member; 21. a third channel; 22. a piston cylinder; 23. an elastic member; 24. a placement groove; 25. a first balance hole; 26. a second seal groove; 27. a blocking structure; 30. a pilot valve member; 31. a pilot valve port; 41. a first guide portion; 411. a fourth channel; 412. a first seal groove; 42. a second guide portion; 421. a fifth channel; 51. a first seal ring; 52. and (4) a sealing ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 to 4, the utility model provides a pilot-operated solenoid valve, include: the valve body component 10, the valve body component 10 includes valve base 11 and valve cover 12 connected with each other, the valve cover 12 has the first passage 121 and valve chamber 122, the valve base 11 has the inlet chamber 111 communicating with valve chamber 122, the end of the valve base 11 facing away from the valve cover 12 has the second passage 112; a piston member 20, the piston member 20 being movably disposed in the valve chamber 122 to connect or disconnect the second passage 112 and the inlet chamber 111; the piston part 20 is provided with a third channel 21, and the first channel 121, the third channel 21 and the second channel 112 are communicated in sequence; a pilot valve member 30, the pilot valve member 30 being connected to an end of the valve cover 12 facing away from the valve seat 11, the pilot valve member 30 being adapted to connect or disconnect the first passage 121 to the valve chamber 122; the first guide portion 41 is provided on the bonnet 12, the second guide portion 42 is provided on the piston member 20, and the first guide portion 41 and the second guide portion 42 are in guiding engagement.

In this embodiment, the pilot valve member 30 is used to communicate the first passage 121 with the valve cavity 122, and then the third passage 21 is used to communicate the valve cavity 122 with the second passage 112, the second passage 112 is connected to an external pipeline, a pressure difference is formed between the second passage 112 and the valve cavity 122, so that the piston member 20 performs a pressure relief action, the piston member 20 moves to communicate the second passage 112 with the inlet cavity 111, so as to communicate the inlet cavity 111 with the third passage 21, and the inlet cavity 111 is connected to an inlet pipeline, so as to communicate an external pipeline with the inlet pipeline. By means of the arrangement, the first channel 121, the second channel 112 and the third channel 21 are respectively arranged on the valve cover 12, the valve seat 11 and the piston component 20, and the valve cavity 122 is communicated with the inlet cavity 111 through the first channel 121, the third channel 21 and the second channel 112 which are sequentially communicated, so that the situation that the whole pilot-operated electromagnetic valve cannot be miniaturized due to the fact that the communicating channels of the valve cavity and the inlet cavity are arranged on the valve seat in the prior art is avoided, the valve seat 11 is miniaturized, and further the miniaturization of the whole structure of the pilot-operated electromagnetic valve is achieved. Meanwhile, the first guide part 41 and the second guide part 42 are arranged to guide the movement of the piston component 20, so that the piston component 20 is prevented from deviating in the movement process, the movement reliability of the piston component 20 is improved, and the performance of the pilot-operated solenoid valve is ensured.

As shown in fig. 2, the axes of the first passage 121, the second passage 112, and the third passage 21 coincide, the axis of the bonnet 12 coincides with the axis of the piston member 20, and the axis of the first passage 121 coincides with the axis of the bonnet 12. With this arrangement, while ensuring the reliability of the communication of the first passage 121, the second passage 112, and the third passage 21 to the valve chamber 122 and the inlet chamber 111, the structural strength of the valve cover 12, the valve seat 11, and the piston member 20 is improved, and the reliability of the pilot-operated solenoid valve is ensured. Specifically, the axes of the valve cover 12, the valve seat 11, the piston member 20, the first passage 121, the second passage 112, and the third passage 21 all coincide, facilitating the machine-shaping of the valve cover 12, the valve seat 11, and the piston member 20.

In particular, the first guiding portion 41 is a first plug-in post, the second guiding portion 42 is a second plug-in post, the first plug-in post is located on a side of the valve cover 12 facing away from the pilot valve part 30, the second plug-in post is located on a side of the piston part 20 facing the pilot valve part 30, and the first plug-in post and the second plug-in post are plugged in. The arrangement is convenient for the guide connection of the first inserting column and the second inserting column in an inserting mode, the connection is simple, the guide is reliable, and the processing is convenient.

Further, the radial dimension of the first plug column is smaller than that of the second plug column, a fourth channel 411 is arranged in the first plug column, a fifth channel 421 communicated with the fourth channel 411 is arranged in the second plug column, the first plug column is plugged in the fifth channel 421, the fourth channel 411 is communicated with the first channel 121, and the fifth channel 421 is communicated with the third channel 21.

In this embodiment, the first plugging column is plugged in the second plugging column, the second plugging column is movably disposed along with the piston member 20, the first passage 121, the fourth passage 411, the fifth passage 421, the third passage 21 and the second passage 112 are sequentially communicated, so that the valve chamber 122 is communicated with the inlet chamber 111, and the movement of the piston member 20 is guided, thereby ensuring the reliability of the pilot-operated solenoid valve.

As shown in fig. 2 and 3, a first sealing groove 412 is formed in a side wall of one end of the first plug-in post extending into the fifth passage 421, the pilot-operated solenoid valve further includes a first sealing ring 51, the first sealing ring 51 is disposed in the first sealing groove 412, and the first sealing ring 51 is in sealing fit with the fifth passage 421. With the arrangement, a gap is prevented from being formed between the side walls of the fourth passage 411 and the fifth passage 421 in the valve chamber 122 and communicating with the inside of the valve chamber 122, which causes failure of the pilot electronic expansion valve, and the tightness of the two passages in the valve chamber 122 is ensured, thereby ensuring the reliability of the pilot solenoid valve. Meanwhile, the first sealing groove 412 is arranged on the first plug-in column, so that the situation that the first sealing groove is arranged on the second plug-in column or a piston component in the prior art to cause inconvenience in installation of the first sealing ring 51 or cause unstable sealing due to easy inclination in installation is avoided, and the sealing effect is improved.

As shown in fig. 2 and 4, the piston member 20 includes a piston cylinder 22 and an elastic member 23, the piston cylinder 22 is movably disposed in the valve cavity 122, the third passage 21 is disposed on the piston cylinder 22, a placement groove 24 is disposed on one side of the piston cylinder 22 facing the first passage 121, the second guide portion 42 is connected to a bottom surface of the placement groove 24, the elastic member 23 is disposed in the placement groove 24 and is in limit fit with an inner wall of the placement groove 24, and two ends of the elastic member 23 are abutted to the valve cover 12 and the piston cylinder 22 respectively; wherein the axis of the piston cylinder 22, the axis of the third passage 21, and the axis of the second guide portion 42 coincide.

In this embodiment, after the pilot valve member 30 connects the first passage 121 and the valve chamber 122, the piston cylinder 22 performs a pressure relief operation and moves toward the pilot valve member 30 side to compress the elastic member 23 in the placement groove 24 to connect the second passage 112 and the inlet chamber 111, thereby achieving communication between the inlet chamber 111 and the third passage 21; after the pilot valve member 30 disconnects the communication between the first passage 121 and the valve chamber 122, the pressure difference between the second passage 112 and the valve chamber 122 disappears, and the piston cylinder 22 moves to the side away from the pilot valve member 30 by the elastic force of the elastic member 23, disconnecting the communication between the second passage 112 and the inlet chamber 111, and further disconnecting the communication between the inlet chamber 111 and the third passage 21. By means of the arrangement, the automatic resetting of the piston cylinder 22 is realized through the elastic piece 23, and the reliability of the pilot type electromagnetic valve is guaranteed. Further, the elastic member 23 is in limit fit with the inner wall of the placement groove 24, so that the force point of the piston cylinder 22 abutting against the elastic member 23 is located at an outward position, and the stability of movement of the piston cylinder 22 when the pilot valve member 30 is opened and closed is improved. Specifically, the axis of the piston cylinder 22, the axis of the third passage 21, the axis of the second guide portion 42, and the axis of the fifth passage 421 coincide, facilitating the machine-shaping of the piston member 20 and the second guide portion 42.

Specifically, the first guide portion 41 and the valve cover 12 are of an integral structure, and the second guide portion 42 and the piston cylinder 22 are of an integral structure. This arrangement facilitates the integral forming of the valve cover 12 and the first guide portion 41, and the integral forming of the second guide portion 42 and the piston cylinder 22. Specifically, in the present embodiment, the axis of the valve cover 12, the axis of the first guide portion 41, the axis of the second guide portion 42, the axis of the valve seat 11, and the axis of the piston cylinder 22 all coincide, further, the axis of the first passage 121, the axis of the second passage 112, the axis of the third passage 21, the axis of the fourth passage 411, and the axis of the fifth passage 421 all coincide, and the axis of the piston cylinder 22 and the axis of the third passage 21 all coincide, so that the above-mentioned axes all coincide, and the machining and assembling of the valve cover 12, the first guide portion 41, the second guide portion 42, the valve seat 11, and the piston cylinder 22 are facilitated.

Alternatively, the outer side wall of the piston cylinder 22 may be in guiding engagement with the inner side wall of the valve cover 12 or the valve seat 11. With this arrangement, when the outer side wall of the piston cylinder 22 is guided to engage with the inner side wall of the valve seat 11, the first guide portion 41 of the valve cover 12 can be eliminated, facilitating further miniaturization of the entire valve. Specifically, the outer periphery of the piston cylinder 22 is provided with an extension section extending along the axial direction of the piston cylinder 22, and the extension section is in guiding fit with the inner side wall of the valve cover 12 or the valve seat 11.

As shown in fig. 2 and 4, the piston cylinder 22 has a first balance hole 25, two ends of the first balance hole 25 are respectively communicated with the valve cavity 122 and the inlet cavity 111, the sidewall of the piston cylinder 22 further has a second seal groove 26, the piston member 20 further includes a seal ring 52, the seal ring 52 is disposed in the second seal groove 26, and the seal ring 52 is in sealing fit with the inner wall of the valve cavity 122.

Specifically, the outer side wall of the piston cylinder 22 and the inner side wall of the valve chamber 122 are sealed by the sealing ring 52 arranged in the second sealing groove 26, and the first balance hole 25 is used for realizing communication between the valve chamber 122 and the inlet chamber 111, so that the situation that the amount of fluid flowing between the valve chamber 122 and the inlet chamber 111 is too large due to a gap between the outer side wall of the piston cylinder 22 and the inner side wall of the valve chamber 122 is avoided, and the reliability of the pilot-operated solenoid valve is ensured. Specifically, two first balance holes 25 are provided, the two first balance holes 25 are respectively provided on two sides of the third channel 21, each first balance hole 25 includes a first hole section, a transition section and a second hole section which are connected at one time, the first hole section is communicated with the valve cavity, the second hole section is communicated with the inlet cavity, wherein the radial dimension of the first hole section is smaller than that of the second hole section, so that the fluid circulation between the valve cavity 122 and the inlet cavity 111 cannot affect the pressure relief action of the piston cylinder 22, and the reliability of the movement of the piston cylinder 22 is ensured.

Optionally, the total flow area of the first balance hole 25 is smaller than the minimum area in the first channel 121 and the third channel 21, so as to ensure that the pressure relief speed is greater than the pressure balance speed of the first balance hole 25 when the pilot-operated solenoid valve opens, and ensure that the piston cylinder 22 performs the pressure relief operation smoothly and opens the valve.

Further, the piston member 20 further comprises a blocking structure 27, the blocking structure 27 is connected with one end of the piston cylinder 22 facing the second passage 112, the blocking structure 27 has a blocking position and an avoiding position, and in the case that the blocking structure 27 is in the blocking position, the blocking structure 27 is abutted with the valve seat 11, and the second passage 112 is disconnected from the inlet cavity 111; with the blocking structure 27 in the retracted position, the blocking structure 27 is separated from the valve seat 11 and the second passage 112 communicates with the inlet chamber 111.

In this embodiment, the piston cylinder 22 includes a cylinder body and a communicating cylinder which are coaxially arranged, the communicating cylinder and the second guiding portion 42 are respectively arranged at two ends of the cylinder body, and the third channel 21 is located in the cylinder body and the communicating cylinder, wherein the communicating cylinder is higher than the blocking structure 27 along the axial direction of the third channel 21. Specifically, the barrel has the third seal groove towards one side of a intercommunication section of thick bamboo, block structure 27 includes circular sealing plug and connecting piece, circular sealing plug sets up in the third seal groove, the spacing cooperation of the lateral wall of circular sealing plug and the inside wall of third seal groove, the spacing cooperation of the inside wall of circular sealing plug and the lateral wall of a intercommunication section of thick bamboo, one side that circular sealing plug deviates from the barrel has the spread groove, the connecting piece is located the spread groove and with a intercommunication section of thick bamboo fixed connection, in order to be fixed with circular sealing plug. With the arrangement, the circular sealing plug in the blocking structure 27 is abutted against the valve seat 11, so that the air tightness when the second passage 112 is disconnected from the inlet cavity 111 is ensured, and the reliability of the pilot-operated electromagnetic valve is ensured.

Specifically, the valve seat comprises a seat body and a spacing cylinder, the axes of the seat body and the spacing cylinder are coincident, the inlet cavity 111 is located in the seat body, the spacing cylinder is located in the inlet cavity 111 and connected with the seat body, the second passage 112 is located in the spacing cylinder and part of the seat body, the valve cavity 122 is also located in the inlet cavity 111, and the inlet cavity 111 is provided with a plurality of connecting holes in the circumferential direction avoiding the valve cavity 122 and used for being connected with an external pipeline. When the blocking structure 27 is in the blocking position, the circular sealing plug abuts against the spacer cylinder, and the second passage 112 is disconnected from the inlet chamber 111; with the blocking structure 27 in the retracted position, the circular sealing plug is separated from the spacer cylinder and the second passage 112 communicates with the inlet chamber 111.

As shown in fig. 2 and 3, the valve cover 12 and the valve seat 11 are in threaded connection, one side of the valve cover 12, which faces away from the piston part 20, is provided with an annular protrusion 123, the area inside the annular protrusion 123 forms a pilot valve cavity 124, the valve cover 12 is provided with a second balance hole 125, and two ends of the second balance hole 125 are respectively communicated with the pilot valve cavity 124 and the valve cavity 122; a portion of the pilot valve member 30 is located in the pilot valve chamber 124, the pilot valve member 30 having a pilot valve port 31, the pilot valve port 31 being openably and closably arranged to connect or disconnect the first passage 121 to or from the pilot valve chamber 124.

In this embodiment, the valve cover 12 is in threaded connection with the valve seat 11, a fourth sealing groove is formed on the outer side wall of the valve cover 12, and the pilot-operated solenoid valve further includes a second sealing ring, which is located in the fourth sealing groove and is in sealing fit with the inner side wall of the valve seat 11. The valve chamber 122 is located in the inlet chamber 111 such that a portion inside the inlet chamber 111 coincides with the valve chamber 122, and a plurality of connection holes are provided in the circumferential direction of the inlet chamber 111 that does not coincide with the valve chamber 122. Specifically, the pilot valve part comprises a pilot valve seat arranged in the pilot valve cavity 124 and a valve port seat fixedly arranged in the pilot valve seat, the outer side wall of the valve port seat is in sealing fit with the inner side wall of the pilot valve seat, a fifth sealing groove is formed in the outer side wall of the pilot valve seat, the pilot-operated electromagnetic valve further comprises a third sealing ring, the third sealing ring is arranged in the fifth sealing groove and is in sealing fit with the inner side wall of the pilot valve cavity 124, the pilot valve port 31 is located on the valve port seat, the pilot valve cavity in the pilot valve seat is divided into an upper cavity and a lower cavity by the valve port seat, a third balancing hole is formed in the valve port seat, and the upper cavity is communicated with the lower cavity through the third balancing hole.

Further, when the pilot valve port 31 is just opened, the upper chamber is communicated with the first passage 121, the second passage 112 is communicated with the lower chamber of the pilot valve chamber 124, the second balance hole 125, the valve chamber 122, the first balance hole 25 and the inlet chamber 111 through the third passage 21, the fifth passage 421, the fourth passage 411, the first passage 121, the upper chamber of the pilot valve chamber 124, the third balance hole, the lower chamber of the pilot valve chamber 124, the second balance hole 125, the valve chamber 122 and the inlet chamber 111, and after a short period of time, a pressure difference is formed between the valve chamber 122 and the inlet chamber 111, so that the piston cylinder 22 performs a pressure relief action to move upward, and the second passage 112 is communicated with the inlet chamber 111 at the lower part of the piston cylinder 22. When the pilot valve port 31 is closed, the upper chamber and the first passage 121 are disconnected, so that the passage communication between the second passage 112 and the inlet chamber 111 is first disconnected, and the pressure difference between the valve chamber 122 and the inlet chamber 111 is small, the piston cylinder 22 moves downward by the elastic member 23, and the communication between the second passage 112 and the inlet chamber 111 at the lower portion of the piston cylinder 22 is closed.

Alternatively, the pilot-operated solenoid valve in this application is a two-stage pilot structure, the pilot valve port 31 is a one-stage pilot valve port, and the opening of the first channel 121 on the side facing the pilot valve member 30 is a two-stage pilot valve port.

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.

Unless specifically stated otherwise, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. 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 one 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 exemplary only and not as 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 invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; 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 if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not 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

1. A pilot operated solenoid valve, comprising:

a valve body component (10), wherein the valve body component (10) comprises a valve seat (11) and a valve cover (12) which are connected with each other, the valve cover (12) is provided with a first passage (121) and a valve cavity (122), the valve seat (11) is provided with an inlet cavity (111) communicated with the valve cavity (122), and one end of the valve seat (11) facing away from the valve cover (12) is provided with a second passage (112);

a piston member (20), the piston member (20) being movably disposed within the valve chamber (122) to connect or disconnect the second passage (112) and the inlet chamber (111); the piston component (20) is provided with a third channel (21), and the first channel (121), the third channel (21) and the second channel (112) are communicated in sequence;

a pilot valve member (30), said pilot valve member (30) being connected to an end of said valve cover (12) facing away from said valve seat (11), said pilot valve member (30) being adapted to connect or disconnect said first passage (121) to said valve chamber (122);

the valve cap (12) comprises a first guide part (41) and a second guide part (42), the first guide part (41) is arranged on the valve cap (12), the second guide part (42) is arranged on the piston component (20), and the first guide part (41) and the second guide part (42) are in guide fit.

2. Pilot-operated solenoid valve according to claim 1,

the axes of the first passage (121), the second passage (112) and the third passage (21) coincide, the axis of the valve cover (12) and the axis of the piston member (20) coincide, and the axis of the first passage (121) and the axis of the valve cover (12) coincide.

3. Pilot operated solenoid valve according to claim 1,

the first guide part (41) is a first plug-in column, the second guide part (42) is a second plug-in column, the first plug-in column is located on one side, away from the pilot valve part (30), of the valve cover (12), the second plug-in column is located on one side, facing the pilot valve part (30), of the piston part (20), and the first plug-in column and the second plug-in column are plugged in.

4. Pilot operated solenoid valve according to claim 3,

the radial dimension of the first plug column is smaller than that of the second plug column, a fourth channel (411) is arranged in the first plug column, a fifth channel (421) communicated with the fourth channel (411) is arranged in the second plug column, the first plug column is plugged in the fifth channel (421), the fourth channel (411) is communicated with the first channel (121), and the fifth channel (421) is communicated with the third channel (21).

5. Pilot-operated solenoid valve according to claim 4,

the side wall of one end, extending into the fifth channel (421), of the first plug column is provided with a first sealing groove (412), the pilot-operated solenoid valve further comprises a first sealing ring (51), the first sealing ring (51) is arranged in the first sealing groove (412), and the first sealing ring (51) is in sealing fit with the fifth channel (421).

6. Pilot-operated solenoid valve according to claim 1,

the piston component (20) comprises a piston cylinder (22) and an elastic piece (23), the piston cylinder (22) is movably arranged in the valve cavity (122), the third channel (21) is arranged on the piston cylinder (22), a placing groove (24) is formed in one side, facing the first channel (121), of the piston cylinder (22), the second guide part (42) is connected with the bottom surface of the placing groove (24), the elastic piece (23) is arranged in the placing groove (24) and is in limit fit with the inner wall of the placing groove (24), and two ends of the elastic piece (23) are respectively abutted to the valve cover (12) and the piston cylinder (22); wherein the axis of the piston cylinder (22), the axis of the third channel (21) and the axis of the second guide (42) coincide.

7. The pilot operated solenoid valve according to claim 6,

the first guide part (41) and the valve cover (12) are of an integral structure, and the second guide part (42) and the piston cylinder (22) are of an integral structure.

8. Pilot-operated solenoid valve according to claim 6,

the piston cylinder (22) is provided with a first balance hole (25), two ends of the first balance hole (25) are respectively communicated with the valve cavity (122) and the inlet cavity (111), the side wall of the piston cylinder (22) is further provided with a second sealing groove (26), the piston component (20) further comprises a sealing ring (52), the sealing ring (52) is arranged in the second sealing groove (26), and the sealing ring (52) is in sealing fit with the inner wall of the valve cavity (122).

9. Pilot-operated solenoid valve according to claim 6,

the piston part (20) further comprises a blocking structure (27), the blocking structure (27) and the piston cylinder (22) are connected towards one end of the second passage (112), the blocking structure (27) has a blocking position and an avoiding position, in the case that the blocking structure (27) is in the blocking position, the blocking structure (27) is in abutment with the valve seat (11), and the second passage (112) is disconnected from the inlet cavity (111); with the blocking structure (27) in the retracted position, the blocking structure (27) is separated from the valve seat (11), and the second passage (112) communicates with the inlet chamber (111).

10. Pilot-operated solenoid valve according to claim 1,

the valve cover (12) is in threaded connection with the valve seat (11), an annular protrusion (123) is arranged on one side, facing away from the piston part (20), of the valve cover (12), the area inside the annular protrusion (123) forms a pilot valve cavity (124), a second balance hole (125) is arranged on the valve cover (12), and two ends of the second balance hole (125) are respectively communicated with the pilot valve cavity (124) and the valve cavity (122); a portion of the pilot valve member (30) is located in the pilot valve chamber (124), the pilot valve member (30) having a pilot valve port (31), the pilot valve port (31) being openably and closably arranged to connect or disconnect the first passage (121) and the pilot valve chamber (124).