CN112460267B

CN112460267B - Electromagnetic valve

Info

Publication number: CN112460267B
Application number: CN201910844433.8A
Authority: CN
Inventors: 王鑫楠; 杨剑
Original assignee: Dunan Environment Technology Co Ltd
Current assignee: Dunan Environment Technology Co Ltd
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2022-11-08
Anticipated expiration: 2039-09-06
Also published as: CN112460267A

Abstract

The present invention provides a solenoid valve comprising: the valve body is provided with an installation cavity, a first flow opening and a second flow opening, and the first flow opening and the second flow opening are both communicated with the installation cavity; the main flow channel is fixed in the mounting cavity in a sealing mode, the first flow channel opening is located at the first end of the main flow channel, and the second flow channel opening is located at the second end of the main flow channel; a first piston member installed in the installation cavity to open or close a first end of the primary flow passage; a second piston member installed in the installation cavity to open or close the second end of the primary flow passage. The electromagnetic valve can realize forward or reverse opening and closing and throttling, and is convenient to use and install.

Description

Electromagnetic valve

Technical Field

The invention relates to the technical field of control devices, in particular to an electromagnetic valve.

Background

A pilot-operated solenoid valve includes a pilot member, a driving member, and a main valve member.

The existing pilot-operated electromagnetic valve intelligently realizes the on-off function of the electromagnetic valve, although a throttling mechanism is arranged, the throttling flow cannot be accurately controlled, and the flow control is influenced by long-time abrasion of a non-metal valve port. The existing electromagnetic valve only has one main valve opening, and the reverse medium is impacted to return and directly open, so that the functions of direction closing and reverse throttling cannot be realized.

Disclosure of Invention

The invention mainly aims to provide a solenoid valve to solve the problem that the solenoid valve in the prior art cannot be closed reversely.

In order to achieve the above object, the present invention provides a solenoid valve comprising: the valve body is provided with an installation cavity, a first flow opening and a second flow opening, and the first flow opening and the second flow opening are both communicated with the installation cavity; the main flow channel is fixed in the mounting cavity in a sealing mode, the first flow channel opening is located at the first end of the main flow channel, and the second flow channel opening is located at the second end of the main flow channel; a first piston member installed in the installation cavity to open or close a first end of the primary flow passage; a second piston member installed in the installation cavity to open or close the second end of the primary flow passage.

Further, the solenoid valve further includes: the throttling component is provided with a flow guide channel and a throttling valve needle, the throttling valve needle is used for adjusting the flow area of the flow guide channel, and the first end of the flow guide channel is communicated with the first flow channel opening; and two ends of the drainage channel are respectively communicated with the second end of the flow guide channel and the second flow channel opening.

Further, be provided with the mounting hole on the valve body, the mounting hole with the installation cavity intercommunication is located the first end of sprue, the throttling part still includes: the connecting part is arranged in the mounting hole, and the flow guide channel is arranged on the connecting part; a sleeve disposed on the connection member; the ejector rod is arranged on the central axis of the sleeve; and two ends of the elastic part respectively prop against the ejector rod and the throttle valve needle.

Further, the connection member includes: the valve cover is arranged in the mounting hole and provided with a connecting sleeve; the guide sleeve is installed in the connecting sleeve, the throttling valve needle is located in the guide sleeve, a through hole communicated with the flow guide channel is formed in the bottom of the guide sleeve, and the end portion of the throttling valve needle penetrates through the through hole to adjust the flow area of the through hole.

Furthermore, the flow guide channel comprises a first flow channel section and a second flow channel section, the first flow channel section is communicated with the second flow channel section through the through hole, the first end of the first flow channel section is communicated with the first flow channel opening, and the second end of the first flow channel section is communicated with the drainage channel.

Furthermore, a cavity is arranged in the connecting component, the first end of the flow guide channel is communicated with the cavity, a first damping hole is arranged on the first piston component, and two ends of the first damping hole are respectively communicated with the cavity and the first flow channel opening.

Furthermore, a second damping hole is formed in the second piston component, and two ends of the second damping hole are communicated with the drainage channel and the second flow channel opening respectively.

Further, an annular groove is formed in the periphery of the connecting component and communicated with the drainage channel, and a second end of the flow guide channel is communicated with the annular groove.

Furthermore, the flow areas of the flow guide channel, the annular groove and the flow guide channel are all larger than the flow areas of the first damping hole and the second damping hole.

Further, both sides of the annular groove are provided with sealing elements.

Further, the sprue spiro union is fixed in the installation intracavity, the tip of sprue sets up screws up the portion.

Further, a sealing structure is arranged on the periphery of the main flow channel.

Further, the first flow channel section is one or two or more.

Further, the drainage channels are one or two or more, and the drainage channels are arranged on the valve body along the periphery of the installation cavity.

Further, the first piston member includes: the piston comprises a first piston body, a second piston body and a piston rod, wherein a first sealing ring is arranged on the periphery of the first piston body; the two ends of the first elastic element respectively abut against the first piston body and the connecting part; the first sealing gasket is arranged on one side, close to the main flow channel, of the first piston body or at the first end of the main flow channel.

Further, the second piston member includes: the periphery of the second piston body is provided with a second sealing ring; the two ends of the second elastic element respectively abut against the second piston body and the bottom of the mounting cavity; and the second sealing gasket is arranged on one side, close to the main flow passage, of the second piston body or at the second end of the main flow passage.

By applying the technical scheme of the invention, because the two ends of the main flow channel are respectively provided with the first piston part and the second piston part, when the valve works actually, fluid can enter from the first flow channel, the first piston part is opened, and then the fluid flows from the first end to the second end of the main flow channel, so that the second piston part is pushed away, and further the fluid flows out from the second flow channel. Meanwhile, the fluid can enter from the second flow passage opening, the second piston part is opened, then the fluid flows to the first end from the second end of the main flow passage, and the first piston part is pushed away, so that the fluid flows out from the first flow passage opening. Therefore, the electromagnetic valve can realize forward or reverse opening and closing and throttling, and is convenient to use and install.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, 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 schematically illustrates a front cross-sectional view of a solenoid valve of the present invention;

FIG. 2 schematically illustrates a side cross-sectional view of the solenoid valve of the present invention;

FIG. 3 schematically illustrates an exploded view of the solenoid valve of the present invention;

figure 4 shows schematically a perspective view of a primary flow channel of the present invention;

FIG. 5 schematically illustrates a cross-sectional view of a connecting member of the present invention;

FIG. 6 schematically illustrates a cutaway perspective view of the solenoid valve of the present invention in a fully open state;

FIG. 7 schematically illustrates a cut-away perspective view of the solenoid valve of the present invention in a throttled state;

FIG. 8 schematically illustrates a cut-away, open perspective view of the solenoid valve of the present invention immediately upon forward opening;

FIG. 9 schematically illustrates a cutaway, open perspective view of the solenoid valve of the present invention when fully open in the forward direction;

FIG. 10 schematically illustrates a cut-away open perspective view of the solenoid valve of the present invention when reverse opened;

figure 11 schematically shows a cross-sectional view of another embodiment of the solenoid valve of the present invention.

Wherein the figures include the following reference numerals:

10. a valve body; 11. a first runner port; 12. a second runner port; 13. a mounting cavity; 14. mounting holes; 20. a main flow passage; 21. a tightening part; 22. a sealing structure; 30. a first piston member; 31. a first piston body; 311. a first orifice; 32. a first elastic element; 33. a first gasket; 34. a first seal ring; 40. a second piston member; 41. a second piston body; 411. a second orifice; 42. a second elastic element; 43. a second gasket; 44. a second seal ring; 50. a throttling member; 51. a flow guide way; 511. a first flow path segment; 512. a second flow path segment; 52. a throttle valve needle; 53. a connecting member; 531. a valve cover; 5311. a cavity; 532. a guide sleeve; 533. a through hole; 534. an annular groove; 535. connecting sleeves; 54. a sleeve; 55. a spring guide rail; 56. a top rod; 60. a drainage channel; 70. and a seal.

Detailed Description

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

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.

For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown 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 terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Referring to fig. 1 to 11, according to an embodiment of the present invention, there is provided a solenoid valve including a valve body 10, a main flow passage 20, a first piston member 30, and a second piston member 40.

The valve body 10 is provided with an installation cavity 13, a first flow passage port 11 and a second flow passage port 12, and the first flow passage port 11 and the second flow passage port 12 are both communicated with the installation cavity 13; the main flow channel 20 is fixed in the mounting cavity 13 in a sealing way, the first flow channel opening 11 is positioned at the first end of the main flow channel 20, and the second flow channel opening 12 is positioned at the second end of the main flow channel 20; a first piston member 30 is installed in the installation chamber 13 to open or close a first end of the main flow passage 20; a second piston member 40 is installed in the installation cavity 13 to open or close a second end of the primary flow passage 20.

Since the first piston member 30 and the second piston member 40 are respectively disposed at the two ends of the main flow passage 20 in the present embodiment, in actual operation, fluid can enter from the first flow passage 11, open the first piston member 30, then flow from the first end to the second end of the main flow passage 20, push the second piston member 40 away, and then flow out from the second flow passage 12. At the same time, fluid can also enter from the second flow port 12, opening the second piston member 40, and then flow from the second end to the first end of the primary flow passage 20, pushing the first piston member 30 open, and then out the first flow port 11. Therefore, the electromagnetic valve in the embodiment can realize forward or reverse opening and closing, and is convenient to use and install.

Meanwhile, the electromagnetic valve in this embodiment further has a throttling function, and has the advantages that the electromagnetic valve in this embodiment further includes a throttling component 50 and a flow guiding channel 60, wherein the throttling component 50 is provided with a flow guiding channel 51 and a throttling valve needle 52, the throttling valve needle 52 is used for adjusting the flow area of the flow guiding channel 51, a first end of the flow guiding channel 51 is communicated with the first flow channel opening 11, and two ends of the flow guiding channel 60 are respectively communicated with a second end of the flow guiding channel 51 and the second flow channel opening 12.

During actual work, the electromagnetic valve can realize forward throttling, in the process, when fluid enters from the first flow channel opening 11, at the moment, the flow area of the main flow channel 20 is far larger than that of the flow channel 51, the fluid firstly enters the flow channel 51, the flow area of the flow channel 51 is adjusted by the throttling valve needle 52 on the throttling component 50, then the fluid enters the drainage channel 60, and then the fluid flows out from the second flow channel opening 12. When the pressure in the installation cavity 13 reaches a certain level, the fluid can open the first piston member 30, the fluid enters from the first end of the main flow passage 20, and then the second piston member 40 is pushed open, and the fluid flows out from the second flow passage opening 12, so that the forward circulation is realized.

The electromagnetic valve can also realize reverse throttling, in the process, when fluid enters from the second flow channel opening 12, at this time, the flow area of the main flow channel 20 is far larger than that of the guide flow channel 51, the fluid firstly enters the guide flow channel 60 and then enters the guide flow channel 51, and the fluid flows out from the first flow channel opening 11 after the flow area of the guide flow channel 51 is regulated and throttled by the throttling valve needle 52 on the throttling component 50. When the pressure in the installation cavity 13 reaches a certain level, the second piston member 40 can be opened, the fluid enters from the second end of the main flow passage 20, then the first piston member 30 is pushed open, and the fluid flows out from the first flow passage 11, so that the reverse flow is realized.

In order to facilitate the installation of the throttling component 50, the valve body 10 in this embodiment is provided with an installation hole 14, the installation hole 14 is communicated with the installation cavity 13 and is located at the first end of the main flow passage 20, the throttling component 50 further includes a connecting component 53, a sleeve 54, a push rod 56 and an elastic component (not shown in the figure), and when the throttling component is installed, the connecting component 53 is installed in the installation hole 14, specifically, the connecting component may be welded, or may be screwed or connected in an interference fit manner. Correspondingly, the flow guide 51 is arranged on the connecting part 53; a sleeve 54 is provided on the connecting part 53, and a spring guide 55 is provided in the sleeve 54; the ejector pin 56 is mounted on the central axis of the sleeve 54; the two ends of the elastic element respectively abut against the ejector rod 56 and the throttle needle 52.

When the electromagnetic valve is electrified, the ejector rod 56 can move along the central axis of the sleeve 54, and then the throttle valve needle 52 is driven to move so as to adjust the flow area of the diversion channel 51.

The connecting part 53 in this embodiment comprises a valve cover 531 and a guide sleeve 532, wherein the valve cover 531 is installed in the installation hole 14, the connecting sleeve 535 is arranged on the valve cover 531, and the sleeve 54 is screwed on the connecting sleeve 535 during actual installation; the guide sleeve 532 is installed in the connecting sleeve 535, the throttle valve needle 52 is located in the guide sleeve 532, which is convenient for guiding the throttle valve needle 52, the bottom of the guide sleeve 532 is provided with a through hole 533 communicated with the flow guide channel 51, the end of the throttle valve needle 52 is arranged in the through hole 533 in a penetrating way to adjust the flow area of the through hole 533, and then the flow area of the flow guide channel 51 is adjusted.

In actual processing, the valve cover 531, the guide sleeve 532, and the connection sleeve 535 of the connection member 53 may be integrally provided, or may be separately processed and fixed together.

Specifically, the flow guide 51 in this embodiment includes a first flow passage section 511 and a second flow passage section 512, where the first flow passage section 511 and the second flow passage section 512 are communicated through a through hole 533, a first end of the first flow passage section 511 is communicated with the first flow passage opening 11, and a second end of the first flow passage section 511 is communicated with the drainage channel 60.

In practical design, the first flow passage section 511 is arranged on the valve cover 531 and extends along the height direction of the valve cover 531, the guide sleeve 532 is provided with a through hole communicated with the through hole 533, and the second flow passage section 512 extends along the horizontal direction, so that the structure is simple and convenient to realize.

In order to facilitate connection, a cavity 5311 is provided inside the connecting member 53 in this embodiment, the first end of the first flow channel segment 511 of the flow guide channel 51 is communicated with the cavity 5311, the first piston member 30 is provided with a first damping hole 311, and two ends of the first damping hole 311 are respectively communicated with the cavity 5311 and the first flow channel port 11, so as to facilitate realization of a throttling control function of the electromagnetic valve. In practice, the first piston member 30 is mounted within the cavity 5311 to facilitate guiding and limiting of the first piston member 30.

Correspondingly, the second piston member 40 in this embodiment is provided with a second damping hole 411, and two ends of the second damping hole 411 are respectively communicated with the drainage channel 60 and the second channel opening 12, so as to realize the circulation and throttling of the fluid.

Referring to fig. 1 to 10, each of the first and second orifice holes 311 and 411 in the present embodiment extends in the axial direction of the main flow passage 20. Preferably, the first orifice 311 and the second orifice 411 in this embodiment may be one or two or more, and when the first orifice 311 and the second orifice 411 are two or more, the first orifice 311 and the second orifice 411 are uniformly arranged in the circumferential direction of the first piston member 30 and the second piston member 40, so as to balance the first piston member 30 and the second piston member 40. The axes of the first piston member 30 and the second piston member 40 coincide.

Referring to fig. 11, in another embodiment of the present invention, the second orifice 411 may also extend in a direction perpendicular to the main flow passage 20. Of course, in other embodiments of the present invention, the second orifice 411 may be disposed obliquely to the second piston member 40.

In order to facilitate connection, simplify an internal flow passage of the solenoid valve and reduce the manufacturing cost of the solenoid valve in this embodiment, the annular groove 534 is disposed on the outer periphery of the connecting part 53 in this embodiment, after the connecting part 53 is assembled on the valve body 10, the annular groove 534 can surround the inner wall surface of the mounting hole 14 to form an annular channel, the annular groove 534 is communicated with the drainage channel 60, the second end of the diversion channel 51 is communicated with the annular groove 534, and the first flow passage port 11 and the second flow passage port 12 can be connected, so that the structure is simple and convenient to implement.

Preferably, in order to seal the annular channel formed by the annular groove 534 and the mounting hole 14, the two sides of the annular groove 534 in this embodiment are provided with the sealing members 70, and the sealing members 70 are sealing rings. Note that, two sides of the annular groove 534 in this embodiment are upper and lower sides of the annular groove 534, where the upper and lower sides are referred to in fig. 1 to 11.

Preferably, the flow areas of the diversion channel 51, the annular groove 534 and the diversion channel 60 in this embodiment are all larger than the flow areas of the first damping hole 311 and the second damping hole 411, so that an effective throttling effect can be achieved when the throttling component 50 throttles.

In order to realize the sealing connection of the main flow passage 20, the main flow passage 20 in the embodiment is screwed and fixed in the mounting cavity 13, and a screwing part 21 is arranged at the end part of the main flow passage 20, so that the main flow passage 20 is screwed and fixed in the mounting cavity 13. Preferably, the sealing structure 22 is disposed on the periphery of the main flow passage 20 in the present embodiment, and the sealing structure 22 is a sealing ring, so as to further improve the sealing performance of the main flow passage 20 in the installation cavity 13. The main flow passage 20 in this embodiment may be a single main structure, and may also be formed by sealing and fixing a plurality of main structures. Be provided with spacing step in the installation cavity 13, be convenient for carry on spacing and support to main flow passage 20.

In actual processing, the number of the first flow path segments 511 in this embodiment may be one, or two or more.

Preferably, the drainage channel 60 in this embodiment may be provided as one, and may also be provided as two or more, and when the drainage channel 60 is provided as two or more, the drainage channel 60 is arranged on the valve body 10 along the outer circumference of the mounting chamber 13.

Specifically, the first piston member 30 in the present embodiment includes a first piston body 31, a first elastic element 32, and a first packing 33. Wherein, the first piston body 31 is provided with a first sealing ring 34 at its outer periphery; both ends of the first elastic element 32 abut against the first piston body 31 and the connecting member 53, respectively; the first packing 33 is disposed at a side of the first piston body 31 adjacent to the main flow passage 20 or at a first end of the main flow passage 20 to facilitate sealing and opening/closing of the first end of the main flow passage 20.

The second piston part 40 in this embodiment comprises a second piston body 41, a second elastic element 42 and a second packing 43, wherein the second piston body 41 is provided with a second packing 44 at its outer periphery; the two ends of the second elastic element 42 respectively abut against the bottom of the second piston body 41 and the mounting cavity 13; a second packing 43 is provided at a side of the second piston body 41 adjacent to the main flow passage 20 or at a second end of the main flow passage 20 to facilitate sealing and opening and closing of the second end of the main flow passage 20.

As can be understood from the above-described embodiments, the solenoid valve of the present invention has the first piston member 30 and the second piston member 40, has a connecting pilot passage 60, and has the throttling member 50 to control the operation of the two first piston members 30 and the second piston member 40.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the electromagnetic valve has multiple medium control functions, can realize the forward direction opening and closing and throttling functions, provides multifunctional valves for complex systems such as an air conditioning system for a vehicle, a thermal management system for the vehicle and the like, can effectively reduce the number of system valves, simplifies the system, reduces the system reliability, enhances the system reliability, and can provide more system control options for the system.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

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 solenoid valve, comprising:

the valve comprises a valve body (10), wherein an installation cavity (13), a first flow opening (11) and a second flow opening (12) are formed in the valve body (10), and the first flow opening (11) and the second flow opening (12) are communicated with the installation cavity (13);

a main flow channel (20), the main flow channel (20) being sealingly secured within the mounting cavity (13), the first flow port (11) being located at a first end of the main flow channel (20), the second flow port (12) being located at a second end of the main flow channel (20);

a first piston member (30), the first piston member (30) being installed in the installation cavity (13) to open or close a first end of the main flow passage (20);

a second piston member (40), the second piston member (40) being installed in the installation cavity (13) to open or close a second end of the main flow passage (20);

the throttling component (50) is provided with a flow guide channel (51) and a throttling valve needle (52), the throttling valve needle (52) is used for adjusting the flow area of the flow guide channel (51), and the first end of the flow guide channel (51) is communicated with the first flow channel opening (11);

and the two ends of the drainage channel (60) are respectively communicated with the second end of the guide channel (51) and the second flow channel opening (12).

2. The solenoid valve according to claim 1, characterized in that the valve body (10) is provided with a mounting hole (14), the mounting hole (14) is communicated with the mounting cavity (13) and is positioned at a first end of the main flow passage (20), the throttling member (50) further comprises:

a connection member (53), the connection member (53) being installed in the installation hole (14), the flow guide (51) being provided on the connection member (53);

a sleeve (54), the sleeve (54) being provided on the connecting member (53);

a push rod (56), wherein the push rod (56) is arranged on the central axis of the sleeve (54);

and two ends of the elastic part respectively abut against the ejector rod (56) and the throttle valve needle (52).

3. The solenoid valve according to claim 2, characterized in that said connection means (53) comprise:

the valve cover (531), the valve cover (531) is installed in the installation hole (14), and a connecting sleeve (535) is arranged on the valve cover (531);

the guide sleeve (532), guide sleeve (532) install in adapter sleeve (535), throttle needle (52) are located in guide sleeve (532), the bottom of guide sleeve (532) have with water conservancy diversion way (51) intercommunication through-hole (533), the tip of throttle needle (52) is worn to establish in through-hole (533) with the adjustment through-flow area of through-hole (533).

4. The electromagnetic valve according to claim 3, characterized in that the flow guide (51) comprises a first flow channel section (511) and a second flow channel section (512), the first flow channel section (511) and the second flow channel section (512) communicating through the through hole (533), a first end of the first flow channel section (511) communicating with the first flow channel opening (11), a second end of the first flow channel section (511) communicating with the drain channel (60).

5. The electromagnetic valve according to claim 3, wherein a cavity (5311) is provided in the connecting member (53), the first end of the flow guide (51) is communicated with the cavity (5311), the first piston member (30) is provided with a first damping hole (311), and two ends of the first damping hole (311) are respectively communicated with the cavity (5311) and the first flow passage opening (11).

6. The electromagnetic valve according to claim 5, characterized in that a second orifice (411) is provided in the second piston member (40), and both ends of the second orifice (411) communicate with the drain passage (60) and the second flow port (12), respectively.

7. The solenoid valve according to claim 6, characterized in that the connecting part (53) is peripherally provided with an annular groove (534), the annular groove (534) communicating with the drainage channel (60), the second end of the flow guide (51) communicating with the annular groove (534).

8. The solenoid valve according to claim 7, characterized in that the flow areas of the pilot channel (51), the annular groove (534) and the pilot channel (60) are each greater than the flow areas of the first orifice (311) and the second orifice (411).

9. The solenoid valve according to claim 7, characterized in that said annular groove (534) is provided on both sides with a seal (70).

10. The solenoid valve according to claim 1, characterized in that said main flow channel (20) is fixed in screwing inside said mounting cavity (13), the end of said main flow channel (20) being provided with a screwing (21).

11. A solenoid valve according to claim 1, characterized in that the periphery of the primary flow channel (20) is provided with a sealing structure (22).

12. The solenoid valve as claimed in claim 4, characterized in that said first flow path section (511) is one or more than two.

13. The solenoid valve according to claim 1, characterized in that said drainage channel (60) is one or more than two, said drainage channel (60) being arranged on said valve body (10) along the periphery of said mounting chamber (13).

14. The electromagnetic valve according to claim 2, characterized in that the first piston member (30) comprises:

a first piston body (31), wherein a first sealing ring (34) is arranged on the periphery of the first piston body (31);

a first elastic element (32), the two ends of the first elastic element (32) respectively abutting against the first piston body (31) and the connecting part (53);

a first gasket (33), the first gasket (33) being disposed at a side of the first piston body (31) adjacent to the primary flow passage (20) or at a first end of the primary flow passage (20).

15. The electromagnetic valve according to any one of claims 1 to 14, characterized in that the second piston member (40) comprises:

a second piston body (41), wherein a second sealing ring (44) is arranged on the periphery of the second piston body (41);

a second elastic element (42), wherein two ends of the second elastic element (42) respectively abut against the second piston body (41) and the bottom of the mounting cavity (13);

a second gasket (43), said second gasket (43) being arranged at a side of said second piston body (41) close to said primary flow channel (20) or at a second end of said primary flow channel (20).