WO2023179349A1

WO2023179349A1 - Pilot-operated solenoid valve

Info

Publication number: WO2023179349A1
Application number: PCT/CN2023/079888
Authority: WO
Inventors: 徐明杰; 王傅钢; 沙海建; 张文嵘
Original assignee: 浙江盾安人工环境股份有限公司
Priority date: 2022-03-25
Filing date: 2023-03-06
Publication date: 2023-09-28
Also published as: CN217301817U

Abstract

A pilot-operated solenoid valve, comprising: a valve body member (10), the valve body member (10) comprising a valve seat (11) and a valve cover (12) which are connected to each other, the valve cover (12) being provided with a first passage (121) and a valve cavity (122), the valve seat (11) being provided with an inlet cavity (111) communicating with the valve cavity (122), the end of the valve seat (11) that faces away from the valve cover (12) being provided with a second passage (112); a piston member (20), the piston member (20) being movably arranged in the valve cavity (122) to connect or disconnect the second passage (112) and the inlet cavity (111), and the piston member (20) being provided with a third passage (21), and the first passage (121), the third passage (21) and the second passage (112) sequentially communicating with one another; a pilot valve member (30), the pilot valve member (30) being connected to the end of the valve cover (12) that faces away from the valve seat (11), and the the pilot valve member (30) being used for connecting or disconnecting the first passage (121) and the valve cavity (122); and a first guide portion (41) and a second guide portion (42), the first guide portion (41) being arranged on the valve cover (12), the second guide portion (42) being arranged on a piston member (20), and the first guide portion (41) and the second guide portion (42) being in pilot fit. By using the solution, the entire structure of the pilot-operated solenoid valve is miniaturized, thereby improving the movement reliability of the piston member, and ensuring the performance of the pilot-operated solenoid valve.

Description

Pilot solenoid valve

This application requires priority for the patent application submitted to the China State Intellectual Property Office on March 25, 2022, with the application number 202220682711.1 and the invention name "Pilot Solenoid Valve".

Technical field

The present application relates to the technical field of solenoid valves, specifically, to a pilot-operated solenoid valve.

Background technique

Currently, for pilot-operated solenoid valves in the prior art, the channel used to connect the valve chamber and the inlet chamber is set on the side wall of the valve seat. In order to ensure the reliability of the valve seat, the size of the valve seat needs to be enlarged, resulting in Pilot-operated solenoid valves cannot be miniaturized. At the same time, the piston component in the prior art is prone to deflection during movement in the valve cavity, causing the pilot solenoid valve to become stuck or fail.

Application content

The present application provides a pilot-operated solenoid valve to solve the problems in the prior art that the pilot-operated solenoid valve cannot be miniaturized and the movement of the piston component is unreliable.

In order to solve the above problems, this application provides a pilot solenoid valve, including: a valve body component, the valve body component includes a valve seat and a valve cover connected to each other, the valve cover has a first channel and a valve chamber, the valve seat has a valve seat and a valve cover. The inlet chamber is connected with the valve chamber, and the end of the valve seat facing away from the valve cover has a second channel; the piston component is movably arranged in the valve chamber to connect or disconnect the second channel and the inlet cavity; the piston component has a third channels, the first channel, the third channel and the second channel are connected in sequence; the pilot valve component is connected to the end of the valve cover away from the valve seat, and the pilot valve component is used to connect or disconnect the first channel and the valve cavity; The first guide part and the second guide part are arranged on the valve cover and the second guide part is arranged on the piston component. The first guide part and the second guide part are guided and matched.

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 component, and the axis of the first channel is coincident with the axis of the valve cover.

Further, the first guide part is a first plug-in column, the second guide part is a second plug-in column, the first plug-in column is located on the side of the valve cover away from the pilot valve component, and the second plug-in column is located on the side of the piston component facing On one side of the pilot valve component, the first plug-in post and the second plug-in post are plugged into each other.

Further, the radial size of the first plug-in column is smaller than the radial size of the second plug-in column, the first plug-in column is provided with a fourth channel, and the second plug-in column is provided with a fifth channel connected with the fourth channel. , the first plug-in post is plugged into the fifth channel, the fourth channel is connected to the first channel, and the fifth channel is connected to the third channel.

Further, a first sealing groove is provided on the side wall of one end of the first insertion post extending into the fifth channel. The pilot solenoid valve also includes a first sealing ring. The first sealing ring is disposed in the first sealing groove. The sealing ring and the fifth channel seal fit.

Further, the piston component includes a piston barrel and an elastic member. The piston barrel is movably arranged in the valve chamber. The third channel is arranged on the piston barrel. The side of the piston barrel facing the first channel has a placement groove. The second guide part and The bottom surface of the placement groove is connected, and the elastic member is arranged in the placement groove and cooperates with the inner wall of the placement groove. The two ends of the elastic member are respectively in contact with the valve cover and the piston cylinder; among them, the axis of the piston cylinder and the axis of the third channel Coincident with the axis of the second guide part.

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

Further, the piston cylinder has a first balance hole, and both ends of the first balance hole are connected to the valve chamber and the inlet chamber respectively. The side wall of the piston cylinder also has a second sealing groove. The piston component also includes a sealing ring. The sealing ring is provided In the second sealing groove, the sealing ring is in sealing fit with the inner wall of the valve cavity.

Further, the piston component also includes a blocking structure. The blocking structure is connected to one end of the piston barrel toward the second channel. The blocking structure has a blocking position and an avoidance position. When the blocking structure is in the blocking position, the blocking structure The structure and the valve seat are in contact, and the second channel is disconnected from the inlet port; when the blocking structure is in the avoidance position, the blocking structure and the valve seat are separated, and the second channel is connected to the inlet port.

Further, the valve cover and the valve seat are threadedly connected, the side of the valve cover facing away from the piston component has an annular protrusion, the area within the annular protrusion forms a pilot valve cavity, the valve cover has a second balance hole, and both sides of the second balance hole The ends are connected to the pilot valve cavity and the valve cavity respectively; a part of the pilot valve component is located in the pilot valve cavity, the pilot valve component has a pilot valve port, and the pilot valve port can be opened and closed so that the first channel and the pilot valve cavity are connected or disconnect.

Applying the technical solution of the present application, a pilot-operated solenoid valve is provided, including: a valve body component, the valve body component includes a valve seat and a valve cover connected to each other, the valve cover has a first channel and a valve chamber, the valve seat has a valve seat and a valve cover. The inlet chamber is connected with the valve chamber, and the end of the valve seat facing away from the valve cover has a second channel; the piston component is movably arranged in the valve chamber to connect or disconnect the second channel and the inlet cavity; the piston component has a third channels, the first channel, the third channel and the second channel are connected in sequence; the pilot valve component is connected to the end of the valve cover away from the valve seat, and the pilot valve component is used to connect or disconnect the first channel and the valve cavity; The first guide part and the second guide part are arranged on the valve cover and the second guide part is arranged on the piston component. The first guide part and the second guide part are guided and matched. Using this solution, the first channel and the valve cavity are connected through the pilot valve component, and then the valve cavity and the second channel are connected through the third channel. The second channel is connected to the external pipeline, and the second channel and the valve cavity are connected. A pressure difference is formed, causing the piston component to perform a pressure relief action. The piston component moves to connect the second channel and the inlet port, thereby realizing the connection between the inlet port and the third channel. The inlet port is connected to the inlet pipeline, thereby realizing the external pipeline and the inlet pipe. Road connectivity. In this arrangement, the first channel, the second channel, and the third channel are respectively arranged on the valve cover, the valve seat, and the piston component, and the valve chamber and the inlet are connected through the sequentially connected first channel, the third channel, and the second channel. The communication between the oral cavity avoids the situation in the prior art that the communication channel between the valve cavity and the inlet cavity is arranged on the valve seat, which results in the overall pilot solenoid valve being unable to be miniaturized. The valve seat is miniaturized, thereby realizing the pilot control. The overall structure of the solenoid valve is miniaturized. At the same time, the first guide part and the second guide part are provided to guide the movement of the piston component, preventing the piston component from deflecting during movement, improving the reliability of the movement of the piston component, and ensuring the performance of the pilot solenoid valve. .

Description of the drawings

The description and drawings that constitute a part of this application are used to provide a further understanding of this application. The illustrative embodiments and their descriptions of this application are used to explain this application and do not constitute an improper limitation of this application. In the attached picture:

Figure 1 shows a schematic structural diagram of a pilot solenoid valve provided according to an embodiment of the present application;

Figure 2 shows a cross-sectional view of the pilot solenoid valve of Figure 1;

Figure 3 shows a schematic structural view of the valve cover and the first guide part in Figure 2;

FIG. 4 shows a schematic structural view of the piston component and the second guide part in FIG. 2 .

Among them, the above-mentioned drawings include the following reference signs:

10. Valve body parts; 11. Valve seat; 111. Inlet port; 112. Second channel; 12. Valve cover; 121. First channel; 122. Valve cavity; 123. Annular protrusion; 124. Pilot valve cavity; 125. Second balancing hole; 20. Piston component; 21. Third channel; 22. Piston cylinder; 23. Elastic member; 24. Placement groove; 25. First balancing hole; 26. Second sealing groove; 27. Sealing Blocking structure; 30. Pilot valve component; 31. Pilot valve port; 41. First guide part; 411. Fourth channel; 412. First sealing groove; 42. Second guide part; 421. Fifth channel; 51. The first sealing ring; 52, sealing ring.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application or its application or uses. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

As shown in Figures 1 to 4, this application provides a pilot-operated solenoid valve, including: a valve body component 10. The valve body component 10 includes a valve seat 11 and a valve cover 12 connected to each other. The valve cover 12 has a first channel. 121 and valve chamber 122, the valve seat 11 has an inlet chamber 111 connected with the valve chamber 122, and the end of the valve seat 11 facing away from the valve cover 12 has a second channel 112; the piston component 20, the piston component 20 is movably arranged in the valve chamber 122 inside, so that the second channel 112 and the inlet chamber 111 are connected or disconnected; the piston component 20 has a third channel 21, and the first channel 121, the third channel 21 and the second channel 112 are connected in sequence; the pilot valve component 30, the pilot valve The component 30 is connected to the end of the valve cover 12 facing away from the valve seat 11. The pilot valve component 30 is used to connect or disconnect the first channel 121 and the valve chamber 122; the first guide part 41 and the second guide part 42, the first guide part 41 is provided on the valve cover 12, the second guide part 42 is provided on the piston component 20, the first guide part 41 and the second guide part 42 guide and cooperate.

In this embodiment, the first channel 121 and the valve chamber 122 are connected through the pilot valve component 30, and then the valve chamber 122 and the second channel 112 are connected through the third channel 21. The second channel 112 is connected to the external pipeline. , a pressure difference is formed between the second channel 112 and the valve chamber 122, causing the piston component 20 to perform a pressure relief action. The piston component 20 moves to connect the second channel 112 and the inlet chamber 111, thereby realizing the connection between the inlet chamber 111 and the third channel 21. Connected, the inlet port 111 is connected to the inlet pipeline, thereby realizing the connection between the external pipeline and the inlet pipeline. In this arrangement, the first channel 121, the second channel 112 and the third channel 21 are respectively provided on the valve cover 12, the valve seat 11 and the piston component 20, and are connected through the first channel 121, the third channel 21 and the third channel respectively. The second channel 112 realizes the connection between the valve cavity 122 and the inlet cavity 111, which avoids the connection between the valve cavity and the inlet cavity 111 in the prior art. The communication channel of the inlet port is arranged on the valve seat, which makes it impossible to miniaturize the entire pilot solenoid valve. Instead, the valve seat 11 is miniaturized, thereby miniaturizing the overall structure of the pilot solenoid valve. At the same time, the first guide part 41 and the second guide part 42 are provided to guide the movement of the piston component 20, preventing the piston component 20 from deflecting during the movement, improving the reliability of the movement of the piston component 20, and ensuring the pilot performance of the solenoid valve.

As shown in FIG. 2 , the axes of the first channel 121 , the second channel 112 and the third channel 21 coincide with each other, the axis of the valve cover 12 coincides with the axis of the piston component 20 , and the axis of the first channel 121 coincides with the axis of the valve cover 12 . This arrangement not only ensures the reliability of the communication between the first channel 121, the second channel 112 and the third channel 21 to the valve chamber 122 and the inlet chamber 111, but also improves the structural strength of the valve cover 12, the valve seat 11 and the piston component 20. , ensuring the reliability of the pilot solenoid valve. Specifically, the axes of the valve cover 12 , the valve seat 11 , the piston component 20 , the first channel 121 , the second channel 112 and the third channel 21 are all coincident, which facilitates the processing and shaping of the valve cover 12 , the valve seat 11 and the piston component 20 .

Specifically, 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 the side of the valve cover 12 away from the pilot valve component 30, and the second plug-in column Located on the side of the piston component 20 facing the guide valve component 30, the first plug-in pin and the second plug-in pin are plugged into each other. This arrangement facilitates the guided connection of the first plug-in column and the second plug-in column through plugging, and the connection is simple, the guide is reliable, and processing is easy.

Further, the radial size of the first plug-in column is smaller than the radial size of the second plug-in column, the first plug-in column has a fourth channel 411 in it, and the second plug-in column has a third channel in communication with the fourth channel 411. Five channels 421, the first plug-in post is inserted into the fifth channel 421, the fourth channel 411 is connected to the first channel 121, and the fifth channel 421 is connected to the third channel 21.

In this embodiment, the first plug-in column is plugged into the second plug-in column, and the second plug-in column is movably arranged along with the piston component 20. The first channel 121, the fourth channel 411, and the fifth channel 421 , the third channel 21 and the second channel 112 are connected in sequence to realize the communication between the valve cavity 122 and the inlet cavity 111 and at the same time guide the movement of the piston component 20 to ensure the reliability of the pilot solenoid valve.

As shown in Figures 2 and 3, the side wall of one end of the first insertion post extending into the fifth channel 421 has a first sealing groove 412. The pilot solenoid valve also includes a first sealing ring 51. The first sealing ring 51 Disposed in the first sealing groove 412, the first sealing ring 51 and the fifth channel 421 are in sealing fit. This arrangement prevents the gap between the side walls of the fourth channel 411 and the fifth channel 421 located in the valve cavity 122 and communicates with the inside of the valve cavity 122, resulting in the failure of the pilot electronic expansion valve, and ensures that the The sealing of the two channels ensures the reliability of the pilot solenoid valve. At the same time, the first sealing groove 412 is provided on the first plug-in column, which avoids the problem in the prior art that the first sealing groove 412 is provided on the second plug-in column or the piston component, which causes inconvenience in the installation of the first seal ring 51 or makes the installation easy. Deflection causes unstable sealing and improves sealing effect.

As shown in Figures 2 and 4, the piston component 20 includes a piston barrel 22 and an elastic member 23. The piston barrel 22 is movably disposed in the valve chamber 122. The third channel 21 is disposed on the piston barrel 22. The piston barrel 22 faces the third One side of a channel 121 has a placement groove 24. The second guide portion 42 is connected to the bottom surface of the placement groove 24. The elastic member 23 is disposed in the placement groove 24 and cooperates with the inner wall of the placement groove 24. Both ends of the elastic member 23 They are respectively in contact with 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 part 42 coincide.

In this embodiment, after the pilot valve component 30 connects the first channel 121 and the valve chamber 122, the piston cylinder 22 performs a pressure relief action and moves to the side of the pilot valve component 30, compressing the elastic member 23 located in the placement groove 24, Connect the second channel 112 and enter oral cavity 111, thereby realizing the connection between the inlet cavity 111 and the third channel 21; after the pilot valve component 30 disconnects the first channel 121 and the valve cavity 122, the pressure difference between the second channel 112 and the valve cavity 122 disappears. , the piston cylinder 22 moves to the side away from the pilot valve component 30 under the elastic force of the elastic member 23, disconnecting the second channel 112 from the inlet chamber 111, and further disconnecting the inlet chamber 111 from the third channel 21. With this arrangement, the automatic reset of the piston barrel 22 is realized through the elastic member 23, ensuring the reliability of the pilot solenoid valve. Furthermore, the elastic member 23 and the inner wall of the placement groove 24 are limitedly matched, so that the force-bearing point of the piston barrel 22 that is in contact with the elastic member 23 is located at an outer position, which improves the movement of the piston barrel 22 when the pilot valve component 30 is opened and closed. stability. Specifically, the axis of the piston barrel 22 , the axis of the third channel 21 , the axis of the second guide part 42 and the axis of the fifth channel 421 are coincident, which facilitates the processing and shaping of the piston component 20 and the second guide part 42 .

Specifically, the first guide part 41 and the valve cover 12 are of an integral structure, and the second guide part 42 and the piston barrel 22 are of an integral structure. This arrangement facilitates the integral processing and molding of the valve cover 12 and the first guide part 41, as well as the integral processing and molding of the second guide part 42 and the piston barrel 22. Specifically, in this embodiment, the axis of the valve cover 12, the axis of the first guide part 41, the axis of the second guide part 42, the axis of the valve seat 11 and the axis of the piston barrel 22 all coincide. Further, the first The axis of the channel 121, the axis of the second channel 112, the axis of the third channel 21, the axis of the fourth channel 411 and the axis of the fifth channel 421 all coincide, and the axis of the piston barrel 22 and the axis of the third channel 21 coincide, so that The above-mentioned axes are all coincident, which facilitates the processing and assembly of the valve cover 12, the first guide part 41, the second guide part 42, the valve seat 11 and the piston cylinder 22.

Alternatively, the outer side wall of the piston barrel 22 can be guided and matched with the inner side wall of the valve cover 12 or the valve seat 11 . With this arrangement, when the outer wall of the piston barrel 22 guides and cooperates with the inner wall of the valve seat 11, the first guide portion 41 on the valve cover 12 can be eliminated, which facilitates further miniaturization in the overall radial direction. Specifically, an extension section extending along the axial direction of the piston barrel 22 is provided on the outer circumference of the piston barrel 22 , and the extension section guides and cooperates with the inner wall of the valve cover 12 or the valve seat 11 .

As shown in Figures 2 and 4, the piston cylinder 22 has a first balance hole 25. Both ends of the first balance hole 25 are connected to the valve chamber 122 and the inlet chamber 111 respectively. There is also a second seal on the side wall of the piston cylinder 22. Groove 26, the piston component 20 also includes a sealing ring 52, the sealing ring 52 is disposed in the second sealing groove 26, the sealing ring 52 sealingly fits with the inner wall of the valve chamber 122.

Specifically, the outer wall of the piston barrel 22 and the inner wall of the valve chamber 122 are sealed by the sealing ring 52 provided in the second sealing groove 26, and the valve chamber 122 and the inlet chamber 111 are connected through the first balance hole 25 to avoid the piston from being blocked. There is a gap between the outer wall of the barrel 22 and the inner wall of the valve chamber 122, which causes an excessive amount of fluid flowing between the valve chamber 122 and the inlet chamber 111, ensuring the reliability of the pilot solenoid valve. Specifically, there are two first balance holes 25 , and the two first balance holes 25 are respectively arranged on both sides of the third channel 21 . The first balance hole 25 includes a first hole section, a transition section, and a second hole section that are connected at once. hole section, the first hole section is connected to the valve cavity, and the second hole section is connected to the inlet cavity, wherein the radial size of the first hole section is smaller than the radial size of the second hole section to ensure that the valve cavity 122 and the inlet cavity 111 The fluid circulation between them will not affect the pressure relief action of the piston barrel 22, ensuring the reliability of the movement of the piston barrel 22.

Optionally, the total flow area of the first balance hole 25 is smaller than the smallest area of the first channel 121 and the third channel 21 to ensure that the pressure relief speed of the pilot solenoid valve is greater than the balance of the first balance hole 25 when the pilot solenoid valve is opened. The speed of the pressure ensures that the piston barrel 22 can smoothly perform the pressure relief action and open the valve.

Further, the piston component 20 also includes a blocking structure 27. The blocking structure 27 is connected to one end of the piston barrel 22 toward the second channel 112. The blocking structure 27 has a blocking position and an avoidance position. When the blocking structure 27 is in the blocking position, In the case of location, The blocking structure 27 is in contact with the valve seat 11, and the second channel 112 is disconnected from the inlet port 111; when the blocking structure 27 is in the avoidance position, the blocking structure 27 is separated from the valve seat 11, and the second channel 112 is disconnected from the inlet. Oral 111 connectivity.

In this embodiment, the piston cylinder 22 includes a coaxial cylinder and a communicating cylinder. The communicating cylinder and the second guide portion 42 are respectively provided at both ends of the cylinder. The third channel 21 is located in the cylinder and the communicating cylinder, where , the height of the communication tube along the axis of the third channel 21 is greater than that of the blocking structure 27 . Specifically, the side of the cylinder facing the communicating cylinder has a third sealing groove. The blocking structure 27 includes a circular sealing plug and a connector. The circular sealing plug is disposed in the third sealing groove. The outer wall of the circular sealing plug and The inner wall of the third sealing groove has a limited fit, and the inner wall of the circular sealing plug has a limited fit with the outer wall of the communicating tube. The side of the circular sealing plug facing away from the cylinder has a connecting groove, and the connecting piece is located in the connecting groove and is connected to the connecting groove. The communicating tube is fixedly connected to fix the circular sealing plug. With this arrangement, the circular sealing plug in the blocking structure 27 contacts the valve seat 11 to ensure the airtightness when the second channel 112 and the inlet port 111 are disconnected, thus ensuring the reliability of the pilot solenoid valve.

Specifically, the valve seat includes a seat body and a spacer cylinder whose axes are overlapped. The inlet chamber 111 is located in the seat body. The spacer cylinder is located in the inlet chamber 111 and connected to the seat body. The second channel 112 is located in the spacer cylinder and part of the seat body. The valve chamber 122 is also located in the inlet cavity 111. The inlet cavity 111 avoids the valve cavity 122 and has a plurality of connection holes in the circumferential direction for connecting external pipelines. When the blocking structure 27 is in the blocking position, the circular sealing plug contacts the spacer cylinder, and the second channel 112 is disconnected from the inlet chamber 111; when the blocking structure 27 is in the avoidance position, the circular sealing plug Separated from the spacer cylinder, the second channel 112 is connected with the inlet chamber 111 .

As shown in Figures 2 and 3, the valve cover 12 and the valve seat 11 are threadedly connected. The side of the valve cover 12 facing away from the piston component 20 has an annular protrusion 123. The area within the annular protrusion 123 forms a pilot valve cavity 124. The valve cover 12 has a second balance hole 125, and both ends of the second balance hole 125 are connected with the pilot valve chamber 124 and the valve chamber 122 respectively; a part of the pilot valve component 30 is located in the pilot valve chamber 124, and the pilot valve component 30 has a pilot valve port 31. The pilot valve port 31 can be opened and closed to connect or disconnect the first channel 121 and the pilot valve chamber 124.

In this embodiment, the valve cover 12 and the valve seat 11 are threadedly connected, and there is a fourth sealing groove on the outer wall of the valve cover 12. The pilot solenoid valve also includes a second sealing ring, and the second sealing ring is located in the fourth sealing groove. And sealingly cooperates with the inner wall of the valve seat 11. The valve cavity 122 is located in the inlet cavity 111 such that a part of the inlet cavity 111 overlaps with the valve cavity 122 , and a plurality of connecting holes are provided in the circumferential direction of the inlet cavity 111 that does not overlap with the valve cavity 122 . Specifically, the pilot valve component includes a pilot valve seat disposed in the pilot valve cavity 124 and a valve port seat fixedly disposed in the pilot valve seat. The outer wall of the valve port seat and the inner wall of the pilot valve seat are sealingly matched. There is a fifth sealing groove on the wall, and the pilot solenoid valve also includes a third sealing ring. The third sealing ring is arranged in the fifth sealing groove and sealingly cooperates with the inner wall of the pilot valve cavity 124. The pilot valve port 31 is located on the valve port seat. , the valve port seat divides the pilot valve cavity in the pilot valve seat into an upper chamber and a lower chamber. The valve port seat has a third balance hole, and the upper chamber and the lower chamber are connected through the third balance hole.

Further, when the pilot valve port 31 is just opened, the upper chamber is connected to the first channel 121. At this time, the second channel 112 passes through the third channel 21, the fifth channel 421, the fourth channel 411, the first channel 121, and the pilot The upper chamber of the 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, the first balance hole 25 and the inlet chamber 111 are connected. After a short period of time, the valve chamber 122 A pressure difference is formed between the piston cylinder 22 and the inlet chamber 111 , causing the piston cylinder 22 to perform a pressure relief action and move upward, so that the second passage 112 and the inlet chamber 111 are connected at the lower part of the piston cylinder 22 . When the pilot valve port 31 is closed, the upper cavity and the first channel 121 are disconnected, so that the channel communication between the second channel 112 and the inlet cavity 111 is disconnected first, and the valve cavity 122 and the inlet cavity are disconnected. When the pressure difference between the oral cavity 111 is small, the piston cylinder 22 moves downward under the action of the elastic member 23 to close the communication between the second channel 112 and the inlet cavity 111 at the lower part of the piston cylinder 22 .

Optionally, the pilot solenoid valve in this application has a two-stage pilot structure, the pilot valve port 31 is a primary pilot valve port, and the opening on one side of the first channel 121 facing the pilot valve component 30 is a secondary pilot valve port.

The above descriptions are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection scope of this application.

Claims

A pilot-operated solenoid valve, characterized by including:

Valve body component (10), the valve body component (10) includes an interconnected valve seat (11) and a valve cover (12), the valve cover (12) has a first channel (121) and a valve chamber (122) ), the valve seat (11) has an inlet chamber (111) connected to the valve cavity (122), and the end of the valve seat (11) away from the valve cover (12) has a second channel (112) ;

A piston component (20), which is movably disposed in the valve chamber (122) to connect or disconnect the second channel (112) and the inlet chamber (111); The piston component (20) has a third channel (21), and the first channel (121), the third channel (21) and the second channel (112) are connected in sequence;

A pilot valve component (30) is connected to one end of the valve cover (12) away from the valve seat (11), and the pilot valve component (30) is used to connect the first The channel (121) is connected or disconnected from the valve chamber (122);

A first guide part (41) and a second guide part (42). The first guide part (41) is provided on the valve cover (12), and the second guide part (42) is provided on the piston. On the component (20), the first guide part (41) and the second guide part (42) are guided and matched.
The pilot solenoid valve according to claim 1, characterized in that:

The axes of the first channel (121), the second channel (112) and the third channel (21) coincide with each other, and the axis of the valve cover (12) and the axis of the piston component (20) coincide with each other. , the axis of the first channel (121) coincides with the axis of the valve cover (12).
The pilot solenoid valve according to claim 1, characterized in that:

The first guide part (41) is a first plug-in post, the second guide part (42) is a second plug-in post, and the first plug-in post is located on the valve cover (12) away from the On one side of the pilot valve component (30), the second plug-in post is located on the side of the piston component (20) facing the pilot valve component (30), and the first plug-in post and the second plug-in post Plug-in post plug-in.
The pilot solenoid valve according to claim 3, characterized in that:

The radial size of the first plug-in column is smaller than the radial size of the second plug-in column, the first plug-in column is provided with a fourth channel (411), and the second plug-in column is provided with and The fourth channel (411) is connected to the fifth channel (421), the first plug-in post is plugged into the fifth channel (421), the fourth channel (411) and the first The channel (121) is connected, and the fifth channel (421) and the third channel (21) are connected.
The pilot solenoid valve according to claim 4, characterized in that:

There is a first sealing groove (412) on the side wall of one end of the first insertion post extending into the fifth channel (421), and the pilot solenoid valve also 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) and the fifth channel (421) are in sealing fit.
The pilot solenoid valve according to claim 1, characterized in that:

The piston component (20) includes a piston barrel (22) and an elastic member (23). The piston barrel (22) is movably disposed in the valve chamber (122), and the third channel (21) is disposed On the piston barrel (22), the side of the piston barrel (22) facing the first channel (121) has a placement groove (24), the second guide portion (42) and the placement groove The bottom surface of (24) is connected, and the elastic member (23) is arranged in the placement groove (24) and is limitedly matched with the inner wall of the placement groove (24). The two ends of the elastic member (23) are respectively It is in contact with 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 second guide part (42) ) coincide with the axes.
The pilot solenoid valve according to claim 6, characterized in that:

The first guide part (41) and the valve cover (12) are of an integrated structure, and the second guide part (42) and the piston barrel (22) are of an integrated structure.
The pilot solenoid valve according to claim 6, characterized in that:

The piston barrel (22) has a first balance hole (25). Both ends of the first balance hole (25) are connected to the valve chamber (122) and the inlet chamber (111) respectively. The piston The side wall of the barrel (22) also has a second sealing groove (26), and the piston component (20) also includes a sealing ring (52). The sealing ring (52) is disposed in the second sealing groove (26). ), the sealing ring (52) and the inner wall of the valve cavity (122) are in sealing fit.
The pilot solenoid valve according to claim 6, characterized in that:

The piston component (20) also includes a blocking structure (27). The blocking structure (27) and the piston barrel (22) are connected toward one end of the second channel (112). The blocking structure (27) (27) has a blocking position and an avoidance position. When the blocking structure (27) is in the blocking position, the blocking structure (27) and the valve seat (11) are in contact, so The second channel (112) and the inlet chamber (111) are disconnected; when the blocking structure (27) is in the avoidance position, the blocking structure (27) and the valve seat (27) 11) Separation, the second channel (112) and the inlet chamber (111) are connected.
The pilot solenoid valve according to claim 1, characterized in that:

The valve cover (12) and the valve seat (11) are threadedly connected. The side of the valve cover (12) facing away from the piston component (20) has an annular protrusion (123). The annular protrusion (123) The area within 123) forms a pilot valve cavity (124), and the valve cover (12) is provided with a second balance hole (125). Both ends of the second balance hole (125) are connected to the pilot valve cavity (124) respectively. 124) and the valve cavity (122) are connected; a part of the pilot valve component (30) is located in the pilot valve cavity (124), and the pilot valve component (30) has a pilot valve port (31), so The pilot valve port (31) can be opened and closed to connect or disconnect the first channel (121) and the pilot valve chamber (124).