DE112022004351T5 - MAGNETIC VALVE - Google Patents

Abstract

The present application provides a solenoid valve comprising: a valve seat having a valve chamber and a valve opening that communicate with each other; a valve sleeve, one end of the valve sleeve being connected to the valve seat, and a cavity of the valve sleeve communicating with an opening at the end of the valve chamber facing away from the valve opening; a valve tappet movably inserted into the valve chamber to block or open the valve opening; and a movable iron core movably arranged in the cavity of the valve sleeve, one end of the movable iron core forming a stop fit with one end of the valve tappet. The technical solution of the present application can solve the problems in the prior art, namely the low flexibility of the connection between the movable iron core and the valve tappet and the risk of jamming of the movable iron core.

Description

This application claims priority to patent application filed on September 10, 2021 with the State Intellectual Property Office of China (CNIPA) with application number 202111063216.9 entitled “Solenoid valve”. The present application claims priority to the patent application filed with the CNIPA on September 10, 2021 with the application number 202122199452.5 entitled “Solenoid valve”. The present application claims priority to the patent application filed with the CNIPA on September 10, 2021 with the application number 202122200286.6 entitled “Solenoid valve”. The present application claims priority to the patent application filed with the CNIPA on September 10, 2021 with the application number 202111064558.2 entitled “Solenoid Valve”.

TECHNICAL AREA

The present application relates to the technical field of solenoid valves, in particular to a solenoid valve.

STATE OF THE ART

In the prior art solenoid valve, the valve tappet and the movable iron core are connected to each other by rivets, etc. The movement of the movable iron core drives the valve tappet to move, thereby opening and closing the valve opening.

The connection between the valve tappet and the movable iron core is inconvenient for the installation of the overall structure. In addition, the connection point requires additional processing to ensure a stable and reliable connection. Since the movable iron core drives the valve tappet to move together, the flexibility of the movement of the movable iron core is poor, and there is a risk of jamming the movable iron core, which affects the use of the solenoid valve.

SUMMARY OF THE INVENTION

The present application provides a solenoid valve to solve the problems in the prior art, namely the low flexibility of the connection between the movable iron core and the valve tappet and the danger of jamming of the movable iron core.

In order to solve the above problems, the present application provides a solenoid valve comprising: a valve seat having a valve chamber and a valve opening communicating with each other; a valve sleeve, one end of the valve sleeve being connected to the valve seat, and a cavity of the valve sleeve communicating with an opening at the end of the valve chamber opposite to the valve opening; a valve stem movably inserted into the valve chamber to block or open the valve opening; and a movable iron core movably disposed in the cavity of the valve sleeve, one end of the movable iron core forming a stop fit with one end of the valve stem.

The valve tappet further comprises a guide head, a tappet body and a blocking head which are connected in series. The radial dimension of the tappet body is smaller than the radial dimension of the guide head and the blocking head. The outer wall of the guide head forms a limit fit with the inner wall of the valve chamber. The guide head forms a stop fit with one end of the movable iron core. The blocking head is intended to block or open the valve opening.

Furthermore, a limiting surface is provided in the valve seat. The solenoid valve also comprises a first elastic element. The first elastic element is placed on the tappet body. One end of the first elastic element rests on the guide head, and the other end of the first elastic element rests on the limiting surface. When the valve opening is opened, the blocking head is outside the valve seat.

Furthermore, the first elastic element is a spring. The gap between the inner wall of the first elastic element and the outer wall of the plunger body is greater than 0.3 mm.

The valve seat further comprises a main structure, an inner limiting ring and an annular sealing ring. The main structure has the valve chamber and the valve opening. The outer wall of the main structure has an annular sealing groove in which the annular sealing ring is arranged. The inner limiting ring is arranged on the inner wall of the valve chamber, and the surface of the inner limiting ring facing the first elastic element forms a limiting surface. When the valve opening is closed, the blocking head rests against the inner limiting ring.

Furthermore, the solenoid valve comprises a first sealing ring. A first sealing groove is provided on the outer wall of the blocking head, and the first sealing ring is arranged in the first sealing groove.

Furthermore, the valve seat also has a flow hole communicating with the valve chamber. A second seal groove is provided on the outer wall of the guide head. The solenoid valve also includes a second seal ring, and the second seal ring is arranged in the second seal groove. The flow hole is located between the guide head and the valve opening.

Furthermore, the guide head has a first conical surface, which is located on a side of the guide head facing away from the tappet body. The blocking head has a second conical surface, which is located on a side of the blocking head facing the tappet body, and a third conical surface, which is located on a side of the blocking head facing away from the tappet body; the cone angle of the second conical surface A is 110° ≤ A ≤ 170°.

Furthermore, the solenoid valve also comprises an attraction body arranged in the valve sleeve. The attraction body is located on a side of the movable iron core facing away from the valve seat. An end of the movable iron core facing the valve opening is provided with a positioning groove. One end of the valve tappet forms a stop fit with the bottom of the positioning groove. A guide surface and a first stop surface are also arranged within the valve seat, wherein the inner wall of the positioning groove forms a limit fit with the guide surface, and the bottom of the positioning groove forms a stop fit with the first stop surface.

Furthermore, the solenoid valve also comprises a second elastic element, the two ends of the second elastic element respectively abut against the attraction body and the movable iron core. The solenoid valve further comprises a first elastic element which is placed on the valve tappet, wherein the elastic force of the second elastic element is greater than the elastic force of the first elastic element.

Furthermore, the valve seat has a first installation hole into which one end of the valve sleeve is inserted and with which the opening of the valve chamber facing the movable iron core is connected. A connecting gap in the cavity of the valve sleeve is a core iron cavity. The core iron cavity includes an upper cavity and a lower cavity which are connected to each other. The upper cavity is formed from the space between the movable iron core and the attraction body, and the lower cavity is formed from the space between the bottom of the first installation hole and the movable iron core. The solenoid valve further includes a compensation channel which communicates the upper cavity and/or the lower cavity with the space outside the solenoid valve.

Furthermore, the balancing channel includes a first balancing channel provided on the side wall of the valve sleeve. One end of the first balancing channel communicates with the upper cavity and the other end of the first balancing channel communicates with the space outside the solenoid valve.

The balancing channel further includes a second balancing channel. The second balancing channel is a through hole that passes through the attraction body. One end of the second balancing channel communicates with the upper cavity and the other end of the second balancing channel communicates with the space outside the solenoid valve.

Furthermore, the compensation channel comprises a third compensation channel. The circumference of the attraction body is welded to the valve sleeve and the non-welded area between the attraction body and the valve sleeve forms a first recess. The first recess communicates with the space outside the solenoid valve. A second recess is provided on the side wall of the attraction body, which communicates with the first recess. The second recess communicates with the upper cavity. The first recess and the second recess form the third compensation channel.

Furthermore, the compensation channel includes a fourth compensation channel. The circumference of the attraction body is welded to the valve sleeve, and the non-welded area between the attraction body and the valve sleeve forms a first recess. The first recess communicates with the space outside the solenoid valve. The outer peripheral surface of the attraction body has a knurled structure, and the gap between the knurled structure and the valve sleeve forms a flow channel. The two ends of the flow channel are respectively communicated with the first recess and the upper cavity. The first recess and the flow channel form the fourth compensation channel.

Furthermore, the compensation channel comprises a fifth compensation channel. The inner wall of the first installation hole has a first recess, the bottom of the first installation hole has a second recess. One end of the first recess communicates with the space outside the solenoid valve, and the other end of the first recess communicates with one end of the second recess. The other end of the second recess communicates with the lower cavity, the first recess and the second recess form the fifth equalizing channel.

Furthermore, the positioning groove is communicated with the lower cavity. An end of the movable iron core facing the attraction body has a mounting hole that communicates with the upper cavity. The movable iron core also has a balancing hole, and both ends of the balancing hole are respectively communicated with the mounting hole and the positioning groove. The solenoid valve further comprises a second elastic member arranged in the mounting hole.

Furthermore, the valve tappet comprises a guide head, a tappet body and a blocking head, which are connected one behind the other. The valve chamber has a sealing chamber, a flow chamber and a valve opening chamber, which are arranged one behind the other and connected to one another. The valve seat has a flow hole which is connected to the flow chamber. The valve opening is located on a side of the valve opening chamber facing away from the flow chamber. The guide head is movably arranged in the sealing chamber and forms a sealing fit with the inner wall of the sealing chamber. An opening of the sealing chamber facing the movable iron core is connected to the core iron cavity; the flow cross section of the cavity between the inner wall of the sealing chamber and the outer wall of the tappet body is S1, and the flow cross section of the cavity between the inner wall of the valve opening chamber and the outer wall of the tappet body is S2, and the following applies: 0 ≤ S1-S2 ≤ 0.3 S2.

Furthermore, the valve seat also comprises a main structure and an inner limiting ring. The main structure has the valve chamber. The inner limiting ring is arranged on the inner wall of the flow chamber. The surface of the inner limiting ring facing the guide head forms a limiting surface. A region of the valve chamber that lies on a side of the inner limiting ring facing the blocking head forms the valve opening chamber.

Furthermore, the solenoid valve also comprises a first sealing ring on the outer wall of the blocking head and a second sealing ring on the outer wall of the guide head. The outer wall of the second sealing ring forms a sealing fit with the inner wall of the sealing chamber. The first sealing ring is provided for sealing adaptation with the inner wall of the valve opening chamber. The inner diameter of the inner limiting ring is larger than the outer diameter of the blocking head. The inner diameter of the valve opening chamber is larger than the inner diameter of the inner limiting ring. The outer diameter of the first sealing ring is larger than the inner diameter of the valve opening chamber.

Furthermore, the tappet body, the sealing chamber and the valve opening chamber are all cylindrical in shape.

The valve seat further comprises a main structure and a third sealing ring. The main structure has a valve chamber, and a third sealing groove is provided on the outer wall of the main structure, in which the third sealing ring is arranged. The third sealing ring is located between the valve opening chamber and the flow hole.

The valve seat further comprises a valve cover and a valve core. The valve cover has an installation chamber into which one end of the valve sleeve is inserted. The valve core and the valve cover are firmly connected. The valve core has a valve chamber and a valve opening that are connected to one another.

Furthermore, the installation chamber has a first installation hole and a second installation hole which communicate with each other, wherein the radial dimension of the first installation hole is larger than the radial dimension of the second installation hole. One end of the valve sleeve is inserted into the first installation hole, and the valve core is passed through the second installation hole.

Furthermore, the second installation hole includes a guide hole and a positioning hole which communicate with each other. The diameter of the positioning hole is larger than the diameter of the guide hole. At the junction between the positioning hole and the guide hole, a second stop surface is provided with which the valve core forms a stop fit.

Furthermore, the valve core comprises a core sleeve and an outer limiting ring on the outer wall of the core sleeve. The core sleeve has a valve chamber and a valve opening, wherein the core sleeve is guided through the guide hole. The outer limiting ring is located in the positioning hole, and the outer limit ring rests on the second stop surface.

Furthermore, the valve core also includes a sealing ring on the outer wall of the core sleeve. A plurality of flow holes are provided circumferentially on the side wall of the core sleeve. Each flow hole is connected to the valve chamber. The plurality of flow holes are located between the outer limit ring and the sealing ring.

Furthermore, the outer wall of the valve sleeve forms a limit fit with the inner wall of the first installation hole. The front side of the valve sleeve rests against the bottom of the first installation hole.

Furthermore, the valve core comprises a core sleeve which has the valve chamber and the valve opening, and an inner limiting ring which is provided on the inner wall of the valve chamber. The solenoid valve further comprises a first elastic element which is placed on the valve tappet, wherein one end of the first elastic element abuts against a step surface on the valve tappet, and the other end of the first elastic element abuts against the inner limiting ring.

Furthermore, the valve seat also includes a third sealing ring and a fourth sealing ring. The outer wall of the valve cover has a fourth sealing groove in which the fourth sealing ring is arranged; the outer wall of the valve core has a third sealing groove in which the third sealing ring is arranged. The side wall of the valve core is provided with a flow hole which communicates with the valve chamber and which is located between the third sealing ring and the fourth sealing ring.

The valve cover further comprises a sleeve body and a retaining ring on the outer wall of the sleeve body. The sleeve body has an installation chamber and the sleeve body has external threads.

By applying the technical solution of the present application, a solenoid valve is provided which comprises: a valve seat having a valve chamber and a valve opening which communicate with each other; a valve sleeve, one end of the valve sleeve being connected to the valve seat and a cavity of the valve sleeve communicating with an opening at the end of the valve chamber facing away from the valve opening; a valve tappet movably inserted in the valve chamber to block or open the valve opening; and a movable iron core movably arranged in the cavity of the valve sleeve, one end of the movable iron core forming a stop fit with one end of the valve tappet. In this solution, the valve tappet and the movable iron core are constructed separately, therefore redundant auxiliary connections are no longer required, which facilitates the installation of the overall structure and is advantageous for processing. In addition, the movable iron core is not connected to the valve tappet, which improves the flexibility of the movable iron core and reduces the risk of jamming of the movable iron core. In addition, the valve tappet is no longer connected to the movable iron core and no longer follows the movable iron core, but the opening and closing of the valve opening is controlled by controlling the stop fit between the movable iron core and the valve tappet.

BRIEF DESCRIPTION OF THE DRAWINGS

• 1 zeigt eine schematische Strukturskizze eines Magnetventils in den Ausführungsbeispielen der vorliegenden Anmeldung;
• 2 zeigt eine schematische Strukturskizze eines Ventilstößels im Magnetventil aus 1;
• 3 zeigt eine schematische Montageskizze des Ventilsitzes mit der Ventilhülse im Magnetventil aus 1;
• 4 zeigt eine schematische Strukturskizze einer Hauptstruktur im Magnetventil aus 1;
• 5 zeigt eine schematische Strukturskizze eines Ventilkerns im Ventilsitz im Magnetventil aus 1;
• 6 zeigt eine schematische Strukturskizze eines Ventildeckels im Ventilsitz im Magnetventil aus 1;
• 7 zeigt eine schematische Strukturskizze des Magnetventils aus 1 in einem geschlossenen Zustand;
• 8 zeigt eine schematische Strukturskizze einer Ventilhülse mit einem ersten Ausgleichskanal im Magnetventil aus 1;
• 9 zeigt eine schematische Strukturskizze eines Anziehungskörpers mit einem zweiten Ausgleichskanal im Magnetventil aus 1;
• 10 zeigt eine schematische Strukturskizze eines Anziehungskörpers mit einem dritten Ausgleichskanal im Magnetventil aus 1;
• 11 zeigt eine schematische Strukturskizze einer Schweißstruktur des Anziehungskörpers und der Ventilhülse im Magnetventil aus 1, die mit einer ersten Aussparung versehen ist;
• 12 zeigt eine schematische Strukturskizze des Anziehungskörpers mit einer zweiten Aussparung im Magnetventil aus 1;
• 13 zeigt eine Querschnittsansicht des Anziehungskörpers aus 6;
• 14 zeigt eine schematische Strukturskizze des Anziehungskörpers mit einem Strömungskanal im Magnetventil aus 1;
• 15 zeigt eine Querschnittsansicht des Anziehungskörpers aus 8;
• 16 zeigt eine schematische Strukturskizze eines Ventildeckels des Ventilsitzes mit einem fünften Ausgleichskanal im Magnetventil aus 1;
• 17 zeigt eine Draufsicht auf 16.

The drawings of the specification, which form a part of the present application, are provided for a better understanding of the present application. The schematic embodiments and their explanations of the present application are intended to interpret the present application and do not constitute an undue limitation of the present application. In the accompanying drawings:

• 1 shows a schematic structural diagram of a solenoid valve in the embodiments of the present application;
• 2 shows a schematic structural sketch of a valve tappet in the solenoid valve from 1 ;
• 3 shows a schematic assembly sketch of the valve seat with the valve sleeve in the solenoid valve from 1 ;
• 4 shows a schematic structural sketch of a main structure in the solenoid valve from 1 ;
• 5 shows a schematic structural sketch of a valve core in the valve seat in the solenoid valve from 1 ;
• 6 shows a schematic structural sketch of a valve cover in the valve seat in the solenoid valve from 1 ;
• 7 shows a schematic structural sketch of the solenoid valve from 1 in a closed state;
• 8th shows a schematic structural sketch of a valve sleeve with a first compensation channel in the solenoid valve from 1 ;
• 9 shows a schematic structural sketch of an attraction body with a second compensation channel in the solenoid valve from 1 ;
• 10 shows a schematic structural sketch of an attraction body with a third compensation channel in the solenoid valve from 1 ;
• 11 shows a schematic structural sketch of a welding structure of the attraction body and the valve sleeve in the solenoid valve made of 1 which is provided with a first recess;
• 12 shows a schematic structural sketch of the attraction body with a second recess in the solenoid valve from 1 ;
• 13 shows a cross-sectional view of the attraction body from 6 ;
• 14 shows a schematic structural sketch of the attraction body with a flow channel in the solenoid valve from 1 ;
• 15 shows a cross-sectional view of the attraction body from 8th ;
• 16 shows a schematic structural sketch of a valve cover of the valve seat with a fifth compensation channel in the solenoid valve from 1 ;
• 17 shows a top view of 16 .

Reference number:

10 valve seat; 11 valve chamber; 111 sealing chamber; 112 flow chamber; 113 valve opening chamber; 12 valve opening; 13 main structure; 131 valve cover; 1311 sleeve body; 1312 retaining ring; 132 valve core; 1321 core sleeve; 1322 outer limit ring; 1323 sealing ring; 133 installation chamber; 1331 first installation hole; 1334 second installation hole; 13321 guide hole; 13322 positioning hole; 14 inner limit ring; 15 annular sealing ring; 151 third sealing ring; 152 fourth sealing ring; 16 annular sealing groove; 161 third sealing groove; 162 fourth sealing groove; 17 flow hole; 181 limit surface; 182 guide surface; 191 first stop surface; 192 second stop surface;
20 valve sleeve;
30 valve tappet; 31 guide head; 32 tappet body; 33 blocking head; 34 first sealing groove; 35 second sealing groove; 36 first conical surface; 37 second conical surface; 38 third conical surface;
40 movable iron core; 41 positioning groove; 42 mounting hole; 43 balancing hole;
50 attraction bodies;
61 first elastic element; 62 second elastic element;
71 first sealing ring; 72 second sealing ring;
80 core iron cavity; 81 upper cavity; 82 lower cavity;
91 first compensation channel; 92 second compensation channel; 93 third compensation channel; 94 first recess; 95 second recess; 97 flow channel; 98 fifth compensation channel; 981 first depression; 982 second depression.

DESCRIPTION OF THE EMBODIMENTS

The technical solutions of the embodiments of the present application are 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, but not all embodiments. The following description of at least one embodiment is merely illustrative and is not intended to limit the application or its application or use in any way. Based on the embodiments in this application, all other embodiments that the person skilled in the art obtains without inventive work fall within the scope of the present application.

As in the 1 until 17 As shown, the embodiments of the present application provide a solenoid valve comprising: a valve seat 10 having a valve chamber 11 and a valve opening 12 that communicate with each other; a valve sleeve 20, one end of the valve sleeve 20 being connected to the valve seat 10, and a cavity of the valve sleeve 20 communicating with an opening at the end of the valve chamber 11 facing away from the valve opening 12; a valve tappet 30 movably inserted into the valve chamber 11 to block or open the valve opening 12; and a movable iron core 40 movably disposed in the cavity of the valve sleeve 20, one end of the movable iron core 40 forming a stop fit with one end of the valve tappet 30.

In this embodiment, the valve tappet 30 and the movable iron core 40 are constructed separately, and therefore redundant auxiliary connections are no longer required, which facilitates the installation of the entire structure and is advantageous for processing. In addition, the movable iron core 40 is not connected to the valve tappet 30, which improves the flexibility of the movable iron core 40 and reduces the risk of jamming of the movable iron core 40. In addition, the valve tappet 30 is no longer connected to the movable iron core 40 and no longer follows the movable iron core 40, but the opening and closing of the valve opening 12 is controlled by controlling the stop fit between the movable iron core 40 and the valve tappet 30.

Optionally, the valve seat 10 comprises a valve cover and a valve core. The valve cover is connected to the valve sleeve 20. The valve core has the valve chamber 11 and the valve opening 12. The valve cover and the valve core can be processed as one piece, or the valve cover and the valve core can be molded separately and then firmly connected to each other.

As in 2 As shown, the valve tappet 30 comprises a guide head 31, a tappet body 32 and a blocking head 33 connected in series. The radial dimension of the tappet body 32 is smaller than the radial dimension of the guide head 31 and the blocking head 33. The outer wall of the guide head 31 forms a limit fit with the inner wall of the valve chamber 11. The guide head 31 forms a stop fit with one end of the movable iron core 40. The blocking head is provided for blocking or opening the valve opening 12.

In this embodiment, the guide head 31 is movably disposed in the valve chamber 11. The guide head 31 forms a stop fit with one end of the movable iron core 40. The movement of the guide head 31 is promoted by the movement of the movable iron core 40. The outer wall of the guide head 31 forms a limit fit with the inner wall of the valve chamber 11 to guide the movement of the valve tappet 30 in the valve chamber 11 and prevent deflection of the valve tappet 30 during the movement. The blocking head 33 follows the movement of the guide head 31. When the blocking head 33 moves to the outside of the valve opening 12, the valve opening 12 is in the opened state. When the blocking head 33 moves to the inside of the valve opening 12, the valve opening 12 is in the blocked state. Such an arrangement enables stable movement of the valve tappet 30 without wobbling and reliable sealing of the valve opening 12, thereby improving the performance of the solenoid valve.

As in 1 and 2 As shown, the valve seat 10 has a limiting surface 181. The solenoid valve also comprises a first elastic element 61. The first elastic element 61 is placed on the tappet body 32. One end of the first elastic element 61 rests on the guide head 31, and the other end of the first elastic element 61 rests on the limiting surface 181. When the valve opening 12 is opened, the blocking head 33 is located outside the valve seat 10.

In this embodiment, both ends of the first elastic member 61 abut against the guide head 31 and the limiting surface 181, respectively. By stretching the first elastic member 61, the valve tappet 30 is moved toward the movable iron core 40, and thus the blocking head 33 is inserted into the valve opening 12 to achieve the purpose of blocking the valve opening 12. With this arrangement, the outer wall of the first elastic member 61 forms a limiting fit with the inner wall of the valve seat 10. The inner wall of the valve seat 10 can guide the first elastic member 61 to some extent. This achieves a good guiding effect and there is no risk of wobbling, so that the movement of the valve tappet 30 becomes more reliable.

Specifically, when the solenoid valve is energized, the movable iron core 40 moves away from the valve seat 10, thereby creating a gap between the movable iron core 40 and the valve tappet 30. At this time, the first elastic member 61, which abuts against the limiting surface 181 in the valve seat 10, expands to press the guide head 31 abutting at its other end toward the movable iron core 40, so that the entire valve tappet 30 moves toward the movable iron core 40, whereby the blocking head 33 is retracted into the valve opening 12 and thus blocks the valve opening 12.

Specifically, the first elastic member 61 is a spring. The gap between the inner wall of the first elastic member 61 and the outer wall of the tappet body 32 is larger than 0.3 mm. Such an arrangement ensures that the fluid in the solenoid valve can flow through the gap between the first elastic member 61 and the tappet body 32 to the valve opening 12, thereby ensuring the flow capacity of the solenoid valve.

Optionally, the inner diameter of the first elastic element 61 should be greater than or equal to the outer diameter of the blocking head 33 and smaller than the outer diameter of the guide head 31 to facilitate installation.

As in 3 until 7 As shown, the valve seat 10 comprises a main structure 13, an inner limiting ring 14 and an annular sealing ring 15. The main structure 13 has the valve chamber 11 and the valve opening 12. The outer wall of the main structure 13 has an annular sealing groove 16 in which the annular sealing ring 15 is located. The inner limiting ring 14 is arranged on the inner wall of the valve chamber 11, and the surface of the inner limiting ring 14 facing the first elastic element 61 forms a limiting surface 181. When the valve opening 12 is closed, the Blocking head 33 on the inner limit ring 14.

In this embodiment, an elastic force is applied to the valve stem 30 by the inner restricting ring 14 restricting the first elastic member 61 so that the first elastic member 61 is in a compressed state. An annular sealing groove 16 is provided on the outer wall of the main structure 13. An annular sealing ring 15 is arranged in the annular sealing groove 16 to ensure the tightness of the solenoid valve.

Specifically, two annular sealing grooves 16 and two annular sealing rings 15 are provided. The valve seat 10 includes a valve cover and a valve core. The two annular sealing grooves 16 are provided on the valve cover and the valve core, respectively. The annular sealing groove 16 on the valve cover is the first annular sealing groove 16, and the annular sealing groove 16 on the valve core is the second annular sealing groove 16. In operation, the solenoid valve is mounted on a connecting seat having an inlet chamber and an outlet chamber. The inlet chamber communicates with the flow hole 17 of the solenoid valve. The outlet chamber communicates with the valve opening 12 of the solenoid valve. An annular sealing ring 15 is arranged in the first annular sealing groove 16 for isolating the inlet chamber from the space outside the connecting seat. The other annular sealing ring 15 is arranged in the second annular sealing groove 16 to isolate the inlet chamber from the outlet chamber. This improves the tightness of the solenoid valve.

As in 1 and 2 , the solenoid valve further includes a first seal ring 71. A first seal groove 34 is provided on the outer wall of the blocking head 33. The first seal ring 71 is arranged in the first seal groove 34. With this arrangement, the blocking head 33 moves toward the movable iron core 40 upon energization of the solenoid valve and enters the valve opening 12. The first seal ring 71 on the blocking head 33 enters the valve opening 12, and the outer wall of the first seal ring 71 sealingly fits against the inner wall of the valve opening 12. The valve opening 12 is blocked by the first seal ring 71 to ensure the reliability of the blocking. Optionally, the seal of the first seal ring 71 is formed as a soft seal, which has a better sealing effect.

In particular, the valve seat 10 also has a flow hole 17 communicating with the valve chamber 11. A second sealing groove 35 is provided on the outer wall of the guide head 31. The solenoid valve also comprises a second sealing ring 72. The second sealing ring 72 is provided in the second sealing groove 35. The flow hole 17 is located between the guide head 31 and the valve opening 12.

In this embodiment, the fluid flows through the flow hole 17 into the valve chamber 11. The flow hole 17 is located between the guide head 31 and the valve opening 12. The second sealing ring 72 is arranged in the second sealing groove 35 on the outer wall of the guide head 31 to block the area of the valve chamber 11 around the position of the guide head 31.

Specifically, when the fluid flows into the valve chamber 11 through the flow hole 17, the fluid flows toward the valve opening 12 or the position of the guide head 31. By blocking the second sealing ring 72, the fluid flowing toward the position of the guide head 31 cannot flow further toward the valve sleeve 20, thereby preventing the fluid from flowing into the cavity of the valve sleeve 20 and affecting the use of the solenoid valve.

Optionally, the seal of the second sealing ring 72 is designed to be soft-sealing, which has a good blocking effect. Optionally, two second sealing grooves 35 and correspondingly two second sealing rings 72 are provided to reinforce the sealing effect.

Furthermore, the guide head 31 has a first conical surface 36. The first conical surface 36 is located on the side of the guide head 31 facing away from the tappet body 32. The blocking head 33 has a second conical surface 37 and a third conical surface 38. The second conical surface 37 is located on a side of the blocking head 33 facing towards the tappet body 32. The third conical surface 38 is located on a side of the blocking head 33 facing away from the tappet body 32; the cone angle of the second conical surface 37 is A, where 110° ≤ A ≤ 170°.

In this embodiment, the valve stem 30 can function as a guide when moving toward the movable iron core 40 by the first conical surface 36. The installation of the second sealing ring 72 is also facilitated by the first conical surface. The second conical surface 37 guides the fluid flowing out of the valve opening 12 and reduces the fluid resistance. The third conical surface 38 facilitates insertion and installation. Among these, the conical angle of the second conical surface 37 is A, where 110° ≤ A ≤ 170°. With this range, the second conical surface 37 has surface 37 has a better flow performance and the impact force of the fluid on the blocking head 33 is lower.

As in 7 As shown, the movable iron core 40 is provided with a positioning groove 41 at an end facing the valve opening 12. One end of the valve tappet 30 forms a stop fit with the bottom of the positioning groove 41. Also provided within the valve seat 10 are a guide surface 182 and a first stop surface 191, the inner wall of the positioning groove 41 forming a limit fit with the guide surface 182, and the bottom of the positioning groove 41 forming a stop fit with the first stop surface 191.

In this embodiment, the movable iron core 40 is provided with a positioning groove 41 at an end facing the valve opening 12. A part of the valve seat 10 is continuously located in the positioning groove 41. The movable iron core 40 is movably arranged in the valve sleeve 20. During the movement of the movable iron core 40, the guide surface 182 in the valve seat 10 guides the movable iron core to prevent deflection of the movement of the movable iron core 40. When the movable iron core 40 moves toward the valve opening 12, the bottom of the positioning groove 41 forms a stop fit with the first stop surface 191 in the valve seat 10 to prevent further movement of the movable iron core 40. With this arrangement, the movement of the movable iron core 40 is restricted by the positioning groove 41, thereby preventing the movable iron core 40 from being deflected during movement and thus affecting the use of the solenoid valve.

Specifically, the bottom of the positioning groove 41 also forms a stop fit with one end of the valve stem 30. When the solenoid valve is turned on, the inner wall of the positioning groove 41 forms a limit fit with the guide surface 182. When the solenoid valve is turned off, the movable iron core 40 moves toward the valve port 12 in the process from closing to opening of the valve and abuts against one end of the valve stem 30 to drive the movement of the valve stem 30s. During the movement, the guide surface 182 always guides the movable iron core 40. When the movable iron core 40 moves to the bottom of the positioning groove 41 and forms a stop fit with the stop surface 191, the movable iron core 40 stops moving. The movable iron core 40 not only forms a stop fit with the stop surface 191, but also a stop fit with one end of the valve tappet 30, namely one end of the guide head 31.

The solenoid valve further comprises an attraction body 50. The attraction body 50 is arranged in the valve sleeve 20. The attraction body 50 is located on a side of the movable iron core 40 facing away from the valve seat 10. When the solenoid valve is switched on, the attraction body 50 generates a magnetic force to attract the movable iron core 40, whereby the movable iron core 40 and the attraction body 50 attract each other. When the solenoid valve is switched off, the movable iron core 40 moves away from the attraction body 50 and forms a stop fit with the valve seat 10.

Furthermore, the solenoid valve also comprises a second elastic element 62. The two ends of the second elastic element 62 are respectively in contact with the attraction body 50 and the movable iron core 40. The solenoid valve further comprises a first elastic element 61. The first elastic element 61 is placed on the valve tappet 30, wherein the elastic force of the second elastic element 62 is greater than the elastic force of the first elastic element 61 to ensure that the electromagnetic valve can open properly.

Optionally, the second elastic element 62 is a spring. One end of the spring is arranged in the movable iron core 40 and the other end rests against the attraction body 50.

Specifically, after the solenoid valve is turned off, the attraction body 50 no longer attracts the movable iron core 40. The second elastic member 62 in the compressed state expands, thereby pushing the movable iron core 40 away from the attraction body 50. In this process, the bottom of the positioning groove 41 in the movable iron core 40 abuts against one end of the guide head 31 of the valve tappet 30, so that the movable iron core 40 sets the valve tappet 30 in motion. The first elastic member 61 is fitted on the valve tappet 30. One end of the first elastic member 61 abuts against the inner restricting ring 14 in the valve seat 10. The other end abuts against the guide head 31 in the valve tappet 30. Since the elastic force of the second elastic member 62 is greater than the elastic force of the first elastic member 61, the valve tappet 30 and the movable iron core 40 move in the direction away from the attraction body 50 by the elastic force of the second elastic member 62, so that the first elastic member 61 fitted on the valve tappet 30 is compressed. Until the bottom of the position When the positioning groove 41 in the movable iron core 40 abuts against the first stop surface 191 in the valve seat 10, the expansion of the second elastic element 62, the movement of the movable iron core 40 and the valve tappet 30, and the compression of the first elastic element 61 stop. Now the blocking head 33 moves to the outside of the valve opening 12 and the valve opening 12 is opened.

As in 1 until 7 , the valve seat 10 has an installation hole 1331. One end of the valve sleeve 20 is inserted into the installation hole 1331. The opening of the valve chamber 11 facing the movable iron core 40 communicates with the installation hole 1331. A communication gap in the cavity of the valve sleeve 20 is a core iron cavity 80. The core iron cavity 80 includes an upper cavity 81 and a lower cavity 82 that communicate with each other. The upper cavity 81 is formed from the space between the movable iron core 40 and the attraction body 50. The lower cavity 82 is formed from the space between the bottom of the first installation hole 1331 and the movable iron core 40. The solenoid valve further includes a compensation channel that connects the upper cavity 81 and/or the lower cavity 82 to the space outside the solenoid valve.

In this embodiment, during the movement of the valve stem 30, the core iron cavity 80 is continuously communicated with the space outside the solenoid valve to equalize the pressure in the core iron cavity 80. This prevents an increase in pressure in the core iron cavity 80 due to the flow of a small part of the fluid along the valve chamber 11 into the core iron cavity 80. In this way, the pressure in the core iron cavity 80 remains stable, and the pressure at both ends of the valve stem 30 remains stable, thereby improving the reliability and stability of the movement of the valve stem 30 and ensuring that there is no risk of failure of the solenoid valve. The cavity of the valve sleeve 20 is communicated with the valve chamber 11. The core iron cavity 80 is located in the communicating cavity. The cavity at one end of the movable iron core 40 near the attraction body 50 is the upper cavity 81 and the cavity facing the other end is the lower cavity 82. The equalizing channel connects the upper cavity 81 and/or the lower cavity 82 with the space outside the solenoid valve to equalize the pressure in the core iron cavity 80 and prevent a pressure increase in the core iron cavity 80 caused by the flow of a small part of the fluid along the valve chamber 11 into the core iron cavity 80, so that a reliable and stable operation of the valve tappet 30 is ensured. In particular, the connecting gap can also be understood as the space that is the remaining cavity of the valve sleeve 20 after removal of the physical structure and is an integral space in which various regions are connected into a whole. The physical structure includes the valve seat 10, the valve tappet 30, the movable iron core 40, the attraction body 50, etc.

Optionally, the upper cavity 81 and the lower cavity 82 of the core iron cavity 80 are connected through the gap between the movable iron core 40 and the valve sleeve 20. A plurality of equalizing channels may be provided. The plurality of equalizing channels cooperate to better and more quickly equalize the pressure in the core iron cavity 80, thereby further ensuring the reliability of the movement of the valve tappet 30.

As in 8th , the equalizing channel includes a first equalizing channel 91. The first equalizing channel 91 is provided on the side wall of the valve sleeve 20. One end of the first equalizing channel 91 communicates with the upper cavity 81. The other end of the first equalizing channel 91 communicates with the space outside the solenoid valve.

In this embodiment, the first equalizing channel 91 is provided on the side wall of the valve sleeve 20 and communicates with the upper cavity 81. The lower cavity 82 can communicate with the upper cavity 81 through the gap between the movable iron core 40 and the valve sleeve 20. When the movable iron core 40 moves in the solenoid valve, the fluid in the upper cavity 81 flows through the first equalizing channel 91 with the space outside the solenoid valve to equalize the pressure in the core iron cavity 80. Thus, an increase in pressure in the core iron cavity 80 due to a small part of the fluid flowing into the core iron cavity 80 can be prevented, thereby ensuring a reliable and stable operation of the valve lifter 30.

Optionally, the upper cavity 81 has the largest volume in the open valve state. The first compensation channel 91 is provided corresponding to the upper cavity 81 in the open valve state.

As in 9 As shown, the compensation channel includes a second compensation channel 92. The second compensation channel 92 is a through hole that passes through the attraction body 50. One end of the second compensation channel 92 is connected to the upper cavity 81. The other The end of the second compensating channel 92 is connected to the space outside the solenoid valve.

In this embodiment, the second equalizing channel 92 is a through hole on the attraction body 50. The fluid in the lower cavity 82 can communicate with the fluid in the upper cavity 81 through the gap between the movable iron core 40 and the valve sleeve 20. When the movable iron core 40 moves in the solenoid valve, the fluid in the upper cavity 81 can communicate with the space outside the solenoid valve via the second equalizing channel 92 to equalize the pressure in the core iron cavity 80. Thus, an increase in pressure in the core iron cavity 80 due to a small part of the fluid flowing into the core iron cavity 80 can be prevented, thereby ensuring a reliable and stable operation of the valve tappet 30.

As in 10 until 13 As shown, the compensation channel includes a third compensation channel 93. The periphery of the attraction body 50 is welded to the valve sleeve 20. The non-welded area between the attraction body 50 and the valve sleeve 20 forms a first recess 94. The first recess 94 communicates with the space outside the solenoid valve. A second recess 95 is provided on the side wall of the attraction body 50, which communicates with the first recess 94. The second recess 95 communicates with the upper cavity 81. The first recess 94 and the second recess 95 form the third compensation channel 93.

In this embodiment, the third balance passage 93 is composed of a first recess 94 and a second recess 95. The second recess 95 is provided corresponding to the position of the first recess 94. The second recess 95 is provided on the side wall of the attraction body 50 and passes through the attraction body. One end of the second recess 95 communicates with the upper cavity 81 and the other end of the second recess 95 communicates with the first recess 94. The lower cavity 82 can communicate with the upper cavity 81 through the gap between the movable iron core 40 and the valve sleeve 20. When the movable iron core 40 moves in the solenoid valve, the fluid in the upper cavity 81 can communicate with the space outside the solenoid valve through the third balance passage 93 to balance the pressure in the core iron cavity 80. This can prevent a pressure increase in the core iron cavity 80 due to the flow of a small part of the fluid into the core iron cavity 80, thereby ensuring a reliable and stable operation of the valve tappet 30.

As in 10 , 14 and 15 , the compensation channel includes a fourth compensation channel. The periphery of the attraction body 50 is welded to the valve sleeve 20. The non-welded area between the attraction body 50 and the valve sleeve 20 forms a first recess 94. The first recess 94 communicates with the space outside the solenoid valve. The outer peripheral surface of the attraction body 50 has a knurled structure. The gap between the knurled structure and the valve sleeve 20 forms a flow channel 97. The two ends of the flow channel 97 communicate with the first recess 94 and the upper cavity 81, respectively. The first recess 94 and the flow channel 97 form the fourth compensation channel.

In this embodiment, the fourth balancing channel is composed of the first recess 94 and the flow channel 97. The lower cavity 82 can communicate with the upper cavity 81 through the gap between the movable iron core 40 and the valve sleeve 20. When the movable iron core moves in the solenoid valve, the fluid in the iron core cavity 80 can communicate with the space outside the solenoid valve via the fourth balancing channel to balance the pressure in the iron core cavity 80. Thus, an increase in pressure in the core iron cavity 80 due to a small part of the fluid flowing into the core iron cavity 80 can be prevented, thereby ensuring a reliable and stable operation of the valve tappet 30. In particular, the fourth balancing channel is composed of the first recess 94 and a part of the flow channel 97 provided corresponding to the first recess 94.

As in 16 and 17 , the equalizing channel includes a fifth equalizing channel 98. A first recess 981 is provided on the inner wall of the first installation hole 1331. A second recess 982 is provided on the bottom of the first installation hole 1331. One end of the first recess 981 communicates with the space outside the solenoid valve. The other end of the first recess 981 communicates with one end of the second recess 982. The other end of the second recess 982 communicates with the lower cavity 82. The first recess 981 and the second recess 982 form the fifth equalizing channel 98.

In this embodiment, the fifth compensation channel 98 consists of a first recess 981 and a second recess 982. The upper cavity 81 can be formed by the gap between the movable iron core 40 and the valve sleeve 20 are in communication with the lower cavity 82. When the movable iron core 40 moves in the solenoid valve, the fluid in the lower cavity 82 can be in communication with the space outside the solenoid valve via the fifth equalizing channel 98 to equalize the pressure in the core iron cavity 80. This can prevent a pressure increase in the core iron cavity 80 due to a small part of the fluid flowing into the core iron cavity 80, thereby ensuring a reliable and stable operation of the valve tappet 30. In particular, one end of the first recess 981 is in communication with the second recess 982, and the first recess 981 is located between the valve seat 10 and the valve sleeve 20.

As in 1 and 7 , the positioning groove 41 communicates with the lower cavity 82. An end of the movable iron core 40 facing the attraction body 50 has a mounting hole 42. The mounting hole 42 communicates with the upper cavity 81. The movable iron core 40 also has a balancing hole 43. Both ends of the balancing hole 43 communicate with the mounting hole 42 and the positioning groove 41, respectively. The solenoid valve further includes a second elastic member 62. The second elastic member 62 is arranged in the mounting hole 42.

In this embodiment, the movement of the movable iron core 40 is restricted by the positioning groove 41 to prevent the movable iron core 40 from deflecting during movement and thus affecting the use of the solenoid valve. The movable iron core 40 has a mounting hole 42 and a balancing hole 43. The radial dimension of the mounting hole 42 is larger than the radial dimension of the balancing hole 43. The mounting hole 42 and the balancing hole 43 form a step surface against which one end of the second elastic member 62 extending into the mounting hole 42 abuts. The other end abuts the attraction body to limit the position of the second elastic member 62, thereby preventing the second elastic member 62 from deflecting during movement of the movable iron core 40 and thus affecting the use of the solenoid valve. Both ends of the balancing hole 43 are respectively connected to the positioning groove 41 and the mounting hole 42. The opening of the positioning groove 41 is connected to the lower cavity 82. The opening of the mounting hole 42 is connected to the upper cavity 81. Through the balancing hole 43, the upper cavity 81 is connected to the lower cavity 82, whereby the circulation between the fluid in the upper cavity 81 and the fluid in the lower cavity 82 in the core iron cavity 80 can be better ensured. The balancing hole 43 cooperates with the balancing channel. This further improves the efficiency of pressure balancing in the core iron cavity 80.

As in 1 , 2 and 4 , the valve tappet 30 comprises a guide head 31, a tappet body 32 and a blocking head 33, which are arranged one behind the other and connected to one another. The valve chamber 11 comprises a sealing chamber 111, a flow chamber 112 and a valve opening chamber 113, which are arranged one behind the other and connected to one another. The valve seat 10 has a flow hole 17. The flow hole 17 is connected to the flow chamber 112. The valve opening 12 is located on a side facing away from the flow chamber 112, the valve opening chamber 113. The guide head 31 is movably arranged in the sealing chamber 111 and cooperates in a sealing manner with the inner wall of the sealing chamber 111. An opening of the sealing chamber 111 facing the movable iron core 40 is connected to the core iron cavity 80; wherein the flow cross section of the cavity between the inner wall of the seal chamber 111 and the outer wall of the tappet body 32 is S1, and the flow cross section of the cavity between the inner wall of the valve opening chamber 111 and the outer wall of the tappet body 32 is S2, and 0 ≤ S1-S2 ≤ 0.3 S2.

In this embodiment, the fluid flowing into the valve chamber 11 through the flow hole 17 generates the same pressure intensity at the two flow cross sections S1 and S2. Since the area between S1 and S2 is controlled within the above range, the areas of S1 and S2 are similar. Thus, after the valve opening chamber 113 is closed, the pressure on the guide head 31 is similar to the pressure on the blocking head 33. Therefore, when the valve is opened, the valve tappet 30 only has to overcome the friction force, so that a higher pressure surge on the valve tappet 30 does not affect the operation of the valve tappet 30 and the reliability of the solenoid valve is improved. In particular, the pressure intensity in the core iron cavity 80 during use is close to the pressure outside the valve tappet of the solenoid valve. This ensures better balance of the pressure at both ends of the valve tappet 30. For example, when it is used in an atmospheric environment, the outlet of the valve opening chamber 113 is in the atmospheric environment. In the installation and sealing process of the solenoid valve, the sealed fluid in the core iron cavity 80 is the atmosphere. This ensures that the Pressure at both ends of the valve tappet 30 is atmospheric pressure. This can better ensure the equalization of the pressure at both ends of the valve tappet 30 when using the valve tappet 30.

As in 4 and 5 As shown, the valve seat 10 also comprises a main structure 13 and an inner limiting ring 14. The main structure 13 has the valve chamber 11. The inner limiting ring 14 is arranged on the inner wall of the flow chamber 112. The surface of the inner limiting ring 14 facing the guide head 31 forms a limiting surface 181. The area of the valve chamber 11 lying on the side of the inner limiting ring 14 facing the blocking head 33 forms the valve opening chamber 113.

In this embodiment, the first elastic element 61 is limited by the inner limiting ring 14, so that the first elastic element 61 is in a compressed state when the valve is opened in order to exert an elastic force on the valve tappet 30 when the valve is closed.

As in 1 until 7 As shown, the solenoid valve also includes a first sealing ring 71 on the outer wall of the blocking head 33, and a second sealing ring 72 on the outer wall of the guide head 31. The outer wall of the second sealing ring 72 sealingly cooperates with the inner wall of the sealing chamber 111. The first sealing ring 71 serves to seal with the inner wall of the valve opening chamber 113. The inner diameter of the inner limiting ring 14 is larger than the outer diameter of the blocking head 33. The inner diameter of the valve opening chamber 113 is larger than the inner diameter of the inner limiting ring 14. The outer diameter of the first sealing ring 71 is larger than the inner diameter of the valve opening chamber 113.

In this embodiment, the first elastic member 61 is first inserted from the end of the valve tappet 30 where the blocking head 33 is located and abuts against the front face of the guide head 31. Thereafter, the valve tappet 30 with the first elastic member 61 is inserted from one end of the sealing chamber 111 in the valve seat 10. The blocking head 33 in the valve tappet 30 extends through the valve chamber 11. The first elastic member 61, which is fitted on the valve tappet 30, abuts against the inner limiting ring 14. The guide head 31 is movably arranged in the sealing chamber 111 and forms a limiting fit with the inner wall of the sealing chamber 111 to enable the installation of the valve tappet 30. The inner diameter of the inner restricting ring 14 is larger than the outer diameter of the blocking head 33 to ensure that the blocking head 33 can pass through the inner restricting ring 14 and be inserted into the side of the valve opening chamber 113. The inner diameter of the valve opening chamber 113 is larger than the inner diameter of the inner restricting ring 14 to ensure that the first sealing ring 71 on the blocking head 33 can be inserted into the valve opening chamber 113 to block the valve opening chamber 113. The outer diameter of the first sealing ring 71 is larger than the inner diameter of the valve opening chamber 113 to ensure the reliability of blocking the valve opening chamber 113.

Optionally, the inner diameter of the first elastic element 61 is larger than the outer diameter of the blocking head 33 to facilitate the assembly of the first elastic element 61.

As in 1 As shown, the tappet body 32, the sealing chamber 111 and the valve opening chamber 113 are all cylindrically shaped.

This arrangement facilitates the restriction of the regions S1 and S2. In particular, the inner diameter of the seal chamber 111 is D1, the inner diameter of the valve opening chamber 113 is D2, and the outer diameter of the tappet body 32 is D3, where S1/S2 = (D1 ² - D3 ² )/(D2 ² - D3 ² ). In this embodiment, S1 is the area of the circular ring between the sealing chamber 111 and the tappet body 32, S2 is the area of the circular ring between the valve opening chamber 113 and the tappet body 32. The flow cross section S1 is the cross-sectional area of the sealing chamber 111 minus the cross-sectional area of the tappet body 32. The flow cross section S2 is the cross-sectional area of the valve opening chamber 113 minus the cross-sectional area of the tappet body 32. Since the cross-sectional area of the tappet body is constant, the following applies: S1/S2 = (D1 ² - D3 ² )/(D2 ² - D3 ² ). This makes it easier to calculate the flow cross sections S1 and S2. The error between the two flow cross sections can be easily calculated using D1, D2 and D3, which simplifies the design.

As in 1 , 3 and 4 As shown, the valve seat 10 comprises a main structure 13 and a third sealing ring 151. The main structure 13 has the valve chamber 11. A third sealing groove 161 is provided on the outer wall of the main structure 13.

The third sealing ring 151 is arranged in the third sealing groove 161. The third sealing ring 151 is located between the valve opening chamber 113 and the flow hole 17.

In this embodiment, the sealing performance of the solenoid valve can be ensured by the third seal ring 151. Specifically, the solenoid valve is mounted on a communication seat having an inlet chamber and an outlet chamber. The inlet chamber communicates with the flow hole 17 of the solenoid valve. The outlet chamber communicates with the valve opening chamber 113 of the solenoid valve. The third seal ring 151 is arranged in the third seal groove 161 to isolate the inlet chamber from the outlet chamber, thereby improving the sealing performance of the solenoid valve.

As in 4 until 6 As shown, the valve seat 10 includes a valve cover 131 and a valve core 132. The valve cover 131 has an installation chamber 133. One end of the valve sleeve 20 is inserted into the installation chamber 133. The valve core 132 and the valve cover 131 are fixedly connected to each other. The valve core 132 has the valve chamber 11 and the valve opening 12 which are in communication with each other.

In this embodiment, the valve cover 131 and the valve core 132 are designed and processed separately. This reduces the processing difficulty and improves the processing accuracy of the valve cover 131 and the valve core 132 and the fitting accuracy between the valve cover 131, the valve core 132 and other parts. As a result, the flexibility of movement of the valve tappet 30 in the valve core 132 is further improved and the processability is better. Furthermore, by separately designing and processing the valve cover 131 and the valve core 132, the production efficiency can be increased and the production cost can be reduced, which has a positive effect on the production of solenoid valves. In particular, the fixed connection between the valve core 132 and the valve cover 131 can be achieved by welding, which is easy to operate and reliable in connection.

Specifically, the installation chamber 133 has a first installation hole 1331 and a second installation hole 1334 that communicate with each other. The radial dimension of the first installation hole 1331 is larger than the radial dimension of the second installation hole 1334. One end of the valve sleeve 20 is inserted into the first installation hole 1331. The valve core 132 passes through the second installation hole 1334. This ensures that the part of the valve core 132 that passes through the second installation hole 1334 is also located in the valve sleeve 20, thereby allowing the cavity in the valve sleeve to communicate with the valve chamber 11 while facilitating assembly between the valve core 132, the valve cover 131, and the valve sleeve 20.

Furthermore, the second installation hole 1334 includes a guide hole 13321 and a positioning hole 13322 which communicate with each other. The diameter of the positioning hole 13322 is larger than the diameter of the guide hole 13321. A second stop surface 192 is provided at the junction between the positioning hole 13322 and the guide hole 13321. The valve core 132 forms a stop fit with the second stop surface 192.

In this embodiment, one end of the valve core 132 is inserted into the first installation hole 1331 through the guide hole 13321. The guide of the guide hole 13321 effectively improves the fitting accuracy and the axial alignment between the valve core 132 and the valve cover 131. The second stop surface 192 forms a limiting fit between the valve core 132 and the valve cover 131, thereby limiting the relative positions of the valve core 132 to the valve cover 131. This structure facilitates processing and facilitates precise installation of the valve core 132 and the valve cover 131.

As in 5 As shown, the valve core 132 includes a core sleeve 1321 and an outer limit ring 1322 on the outer wall of the core sleeve 1321. The core sleeve 1321 has the valve chamber 11 and the valve opening 12, with the core sleeve 1321 passing through the guide hole 13321. The outer limit ring 1322 is located in the positioning hole 13322. The outer limit ring 1322 abuts against the second stop surface 192. In this embodiment, the outer limit ring 1322 is located in the positioning hole 13322. The valve core 132 and the valve cover 131 interact through the interaction of the outer limit ring 1322, the positioning hole 13322, and the second stop surface 192, so that a stable and reliable fit is achieved and the press fit is facilitated.

In particular, a press fit is made between the outer restricting ring 1322 and the positioning hole 13322, which further improves the positioning accuracy. The quality of welding between the valve core 132 and the valve cover 131 is improved by the guide and the press fit between the valve core 132 and the valve cover 131. At the same time, the solder is prevented from penetrating downward or even flowing to the inner surface of the valve core 132. High tightness is achieved.

Furthermore, the valve core 132 also includes a sealing ring 1323 on the outer wall of the core sleeve 1321. A plurality of flow holes 17 are provided circumferentially on the side wall of the core sleeve 1321. Each flow hole 17 is in communication with the valve chamber 11. The plurality of flow holes 17 are located between the outer limiting ring 1322 and the sealing ring 1323.

In this embodiment, a plurality of flow holes 17 are provided circumferentially on the side wall of the core sleeve 1321 so that fluids can be introduced from different directions from the flow holes 17 into the valve chamber 11. The sealing ring 1323 is provided to separate the flow hole 17 from the valve opening 12 on the outside of the solenoid valve so that a sealing effect can be achieved after the solenoid valve is adapted to other structures.

As in 3 As shown, the outer wall of the valve sleeve 20 forms a limit fit with the inner wall of the first installation hole 1331. The front side of the valve sleeve 20 rests against the bottom of the first installation hole 1331.

In this embodiment, by the cooperation between the valve sleeve 20 and the first installation hole 1331, the mounting position of the valve sleeve 20 can be determined to improve the mounting accuracy. Specifically, the valve sleeve 20 is fixedly connected to the valve cover 131 by welding. The fixed connection can be carried out as a welded connection, and the operation is simple and the connection is stable and reliable.

As in 1 and 4 As shown, the valve core 132 comprises a core sleeve 1321 and an inner limiting ring 14. The core sleeve 1321 has a valve chamber 11 and a valve opening 12. The inner limiting ring 14 is provided on the inner wall of the valve chamber 12. The solenoid valve further comprises a first elastic member 61. The first elastic member 61 is fitted onto the valve tappet 30, with one end of the first elastic member 61 abutting a step surface on the valve tappet 30 and the other end of the first elastic member 61 abutting the inner limiting ring 14.

In this arrangement, the first elastic member 61 applies an elastic force to the valve tappet 30 to close the valve opening 12 by the movement of the valve tappet 30. Specifically, the first elastic member 61 is fitted on the valve tappet 30. A step surface is formed between the guide head and the tappet body. One end of the first elastic member 61 abuts the step surface, namely, one end of the first elastic member 61 abuts one end of the guide head. The other end of the first elastic member 61 abuts the inner restricting ring 14. The solenoid valve is closed by the expansion of the first elastic member 61.

As in 1 , 3 and 7 As shown, the valve seat 10 also includes a third seal ring 151 and a fourth seal ring 152. A fourth seal groove 162 is provided on the outer wall of the valve cover 131. The fourth seal ring 152 is arranged in the fourth seal groove 162. A third seal groove 161 is provided on the outer wall of the valve core 132. The third seal ring 151 is arranged in the third seal groove 161. A flow hole 17 is provided on the side wall of the valve core 132, which communicates with the valve chamber 11. The flow hole 17 is located between the third seal ring 151 and the fourth seal ring 152.

In this embodiment, by providing the fourth seal ring 152 on the valve cover 131 and the third seal ring 151 on the valve core 132, the sealing effect can be ensured after assembling the solenoid valve with other structures. Specifically, in this embodiment, the third seal groove 161 is provided on the seal ring 1323. Specifically, the solenoid valve is assembled with the connecting seat. The solenoid valve is installed in the connecting seat. The connecting seat has an inlet chamber and an outlet chamber. The inlet chamber communicates with the flow hole 17. The outlet chamber communicates with the valve opening 12. The fourth seal ring 152 is provided for isolating the inlet chamber from the space outside the connecting seat. The third seal ring 151 is for isolating the inlet chamber from the outlet chamber. By such an arrangement, the flow of fluid in the solenoid valve is ensured, the sealing effect is improved, and reliable use of the solenoid valve is guaranteed.

Optionally, the seal of the fourth sealing ring 152 and the third sealing ring 151 is designed as a soft seal, which has a better sealing effect.

As in 6 As shown, the valve cover 131 comprises a sleeve body 1311 and a retaining ring 1312 on the outer wall of the sleeve body 1311. The sleeve body 1311 has an installation chamber 133. The sleeve body 1311 has external threads. In this embodiment, the valve cover 131 comprises a sleeve body 1311 and a retaining ring 1312. When assembling the solenoid valve, the retaining ring 1312 has a positioning and limiting effect to ensure assembly accuracy. The sleeve body 1311 has an installation chamber 133 to facilitate assembly of the valve core 132 and the valve sleeve 20. The sleeve body 1311 has external threads to facilitate installation of the solenoid valve. In particular, the connection seat has a receiving space in which the solenoid valve is arranged. The retaining ring 1312 on the valve cover 131 in the solenoid valve forms a stop fit with a face of the connection seat at one end of the opening of the receiving space to limit the part of the solenoid valve that enters the connection seat. The sleeve body 1311 of the valve cover 131 in the solenoid valve is provided with external threads, and the receiving space is provided with internal threads. The solenoid valve enters the receiving chamber via a threaded connection so that the connection is stable and reliable.

The above descriptions represent only preferred embodiments of the present application and cannot limit the present application thereto. The present application may have various modifications and changes to those skilled in the art. All changes, equivalent substitutions, improvements, etc. made within the spirit and principles of this application fall within the scope of this application.

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• WO 202111063216 [0001]
• WO 202122199452 [0001]
• WO 202122200286 [0001]
• WO 202111064558 [0001]

Claims (31)

Solenoid valve comprising: a valve seat (10) having a valve chamber (11) and a valve opening (12) which communicate with each other; a valve sleeve (20), one end of the valve sleeve (20) being connected to the valve seat (10), and a cavity of the valve sleeve (20) being connected to an opening at the end of the valve chamber (11) facing away from the valve opening (12); a valve tappet (30) which is movably inserted into the valve chamber (11) in order to block or open the valve opening (12); and a movable iron core (40) which is movably arranged in the cavity of the valve sleeve (20), one end of the movable iron core (40) forming a stop fit with one end of the valve tappet (30). Solenoid valve after Claim 1 , characterized in that the valve tappet (30) comprises a guide head (31), a tappet body (32) and a blocking head (33) which are connected one behind the other, the radial dimension of the tappet body (32) being smaller than the radial dimension of the guide head (31) and the blocking head (33), the outer wall of the guide head (31) forming a limit fit with the inner wall of the valve chamber (11), the guide head (31) forming a stop fit with one end of the movable iron core (40), and the blocking head (33) is provided for blocking or opening the valve opening (12). Solenoid valve after Claim 2 , characterized in that a limiting surface (181) is provided in the valve seat (10); that the solenoid valve further comprises a first elastic element (61), wherein the first elastic element (61) is placed on the tappet body (32), one end of the first elastic element (61) rests on the guide head (31), and the other end of the first elastic element (61) rests on the limiting surface (181); and that the blocking head (33) is located outside the valve seat (10) when the valve opening (12) is open. Solenoid valve after Claim 3 , characterized in that the first elastic element (61) is a spring, wherein the gap between an inner wall of the first elastic element (61) and an outer wall of the tappet body (32) is greater than 0.3 mm. Solenoid valve after Claim 3 , characterized in that the valve seat (10) comprises a main structure (13), an inner limiting ring (14) and an annular sealing ring (15), the main structure (13) having the valve chamber (11) and the valve opening (12) and an outer wall of the main structure (13) having an annular sealing groove (16), the annular sealing ring (15) being arranged in the annular sealing groove (16); that the inner limiting ring (14) is arranged on an inner wall of the valve chamber (11), and a surface of the inner limiting ring (14) facing the first elastic element (61) forms the limiting surface (181), the blocking head (33) resting on the inner limiting ring (14) when the valve opening (12) is closed. Solenoid valve after Claim 2 , characterized in that the solenoid valve further comprises a first sealing ring (71), and a first sealing groove (34) is provided on an outer wall of the blocking head (33), wherein the first sealing ring (71) is arranged in the first sealing groove (34). Solenoid valve after Claim 2 , characterized in that the valve seat (10) further comprises a flow hole (17) which communicates with the valve chamber (11), and that a second sealing groove (35) is provided on an outer wall of the guide head (31); and that the solenoid valve further comprises a second sealing ring (72) which is arranged in the second sealing groove (35), and that the flow hole (17) is arranged between the guide head (31) and the valve opening (12). Solenoid valve after Claim 2 , characterized in that the guide head (31) has a first conical surface (36) which is located on a side of the guide head (31) facing away from the tappet body (32); that the blocking head (33) has a second conical surface (37) and a third conical surface (38), wherein the second conical surface (37) is located on a side of the blocking head (33) facing towards the tappet body (32) and the third conical surface (38) is located on a side of the blocking head (33) facing away from the tappet body (32); wherein the cone angle of the second conical surface (37) is A, 110° ≤ A ≤ 170°. Solenoid valve after Claim 1 , characterized in that the solenoid valve further comprises an attraction body (50) which is arranged in the valve sleeve (20), wherein the attraction body (50) is arranged on a side of the movable iron core (40) facing away from the valve seat (10), wherein an end of the movable iron core (40) facing the valve opening (12) is provided with a positioning groove (41), wherein an end of the valve tappet (30) has a stop fit with a bottom of the positioning and that a guide surface (182) and a first stop surface (191) are further arranged within the valve seat (10), wherein an inner wall of the positioning groove (41) forms a limiting fit with the guide surface (182), and the bottom of the positioning groove (41) forms a stop fit with the first stop surface (191). Solenoid valve after Claim 9 , characterized in that the solenoid valve further comprises a second elastic element (62), wherein the two ends of the second elastic element (62) respectively abut against the attraction body (50) and the movable iron core (40); and that the solenoid valve further comprises a first elastic element (61) which is placed on the valve tappet (30), wherein the elastic force of the second elastic element (62) is greater than the elastic force of the first elastic element (61). Solenoid valve after Claim 9 , characterized in that the valve seat (10) has a first installation hole (1331) into which one end of the valve sleeve (20) is inserted and with which an opening of the valve chamber (11) facing the movable iron core (40) is communicated; that a communication gap in the cavity of the valve sleeve (20) forms a core iron cavity (80) having an upper cavity (81) and a lower cavity (82) which are communicated with each other, the upper cavity (81) being formed by the space between the movable iron core (40) and the attraction body (50), and the lower cavity (82) being formed by the space between the bottom of the first installation hole (1331) and the movable iron core (40); and that the solenoid valve further comprises a compensation channel which communicates the upper cavity (81) and/or the lower cavity (82) with the space outside the solenoid valve. Solenoid valve after Claim 11 , characterized in that the compensation channel comprises a first compensation channel (91) provided on a side wall of the valve sleeve (20), one end of the first compensation channel (91) communicating with the upper cavity (81) and the other end of the first compensation channel (91) communicating with the space outside the solenoid valve. Solenoid valve after Claim 11 , characterized in that the compensation channel comprises a second compensation channel (92) which is a through hole extending through the attraction body (50), one end of the second compensation channel (92) communicating with the upper cavity (81) and the other end of the second compensation channel (92) communicating with the space outside the solenoid valve. Solenoid valve after Claim 11 , characterized in that the compensation channel comprises a third compensation channel (93), and that the circumference of the attraction body (50) is welded to the valve sleeve (20) and a non-welded region between the attraction body (50) and the valve sleeve (20) forms a first recess (94) which communicates with the space outside the solenoid valve, wherein a second recess (95) is provided on a side wall of the attraction body (50) which communicates with the first recess (94), wherein the second recess (95) communicates with the upper cavity (81), and the first recess (94) and the second recess (95) form the third compensation channel (93). Solenoid valve after Claim 11 , characterized in that the compensation channel comprises a fourth compensation channel, and that the circumference of the attraction body (50) is welded to the valve sleeve (20) and a non-welded region between the attraction body (50) and the valve sleeve (20) forms a first recess (94) which (94) is in communication with the space outside the solenoid valve, wherein the outer peripheral surface of the attraction body (50) has a knurled structure and a gap between the knurled structure and the valve sleeve (20) forms a flow channel (97), wherein the two ends of the flow channel (97) are each in communication with the first recess (94) and the upper cavity (81), and the first recess (94) and the flow channel (97) form the fourth compensation channel. Solenoid valve after Claim 11 , characterized in that the compensation channel comprises a fifth compensation channel (98), and that an inner wall of the first installation hole (1331) has a first recess (981), wherein a second recess (982) is arranged at the bottom of the first installation hole (1331), one end of the first recess (981) is communicated with the space outside the solenoid valve, the other end of the first recess (981) is communicated with one end of the second recess (982), and the other end of the second recess (982) is communicated with the lower cavity (82), wherein the first recess (981) and the second recess (982) form the fifth compensation channel (98). Solenoid valve after Claim 11 , characterized in that the positioning groove (41) is connected to the lower cavity (82); that a facing end of the movable iron core (40) has a mounting hole (42) which communicates with the upper cavity (81); that the movable iron core (40) further has a balancing hole (43), the two ends of the balancing hole (43) respectively communicating with the mounting hole (42) and the positioning groove (41); and that the solenoid valve further has a second elastic element (62) which is arranged in the mounting hole (42). Solenoid valve after Claim 11 , characterized in that the valve tappet (30) comprises a guide head (31), a tappet body (32) and a blocking head (33) which are connected one behind the other; that the valve chamber (11) comprises a sealing chamber (111), a flow chamber (112) and a valve opening chamber (113) which are arranged one behind the other and connected to one another; that the valve seat (10) has a flow hole (17) which is connected to the flow chamber (112), the valve opening (12) being arranged on a side facing away from the flow chamber (112), the valve opening chamber (113); that the guide head (31) is movably arranged in the sealing chamber (111) and forms a sealing fit with an inner wall of the sealing chamber (111), wherein an opening of the sealing chamber (111) facing the movable iron core (40) is connected to the core iron cavity (80); wherein a flow cross section of a cavity between an inner wall of the sealing chamber (111) and an outer wall of the tappet body (32) is S1, and a flow cross section of a cavity between an inner wall of the valve opening chamber (113) and an outer wall of the tappet body (32) is S2, 0 ≤ S1-S2 ≤ 0.3 S2. Solenoid valve after Claim 18 , characterized in that the valve seat (10) further comprises a main structure (13) and an inner limiting ring (14), wherein the main structure (13) has the valve chamber (11) and the inner limiting ring (14) is arranged on an inner wall of the flow chamber (112), wherein a surface of the inner limiting ring (14) facing the guide head (31) forms a limiting surface (181), and a region of the valve chamber (11) lying on a side of the inner limiting ring (14) facing the blocking head (33) forms the valve opening chamber (113). Solenoid valve after Claim 19 , characterized in that the solenoid valve further comprises a first sealing ring (71) on an outer wall of the blocking head (33) and a second sealing ring (72) on an outer wall of the guide head (31), wherein an outer wall of the second sealing ring (72) forms a sealing fit with the inner wall of the sealing chamber (111), wherein the first sealing ring (71) is provided for sealing fit with the inner wall of the valve opening chamber (113), wherein the inner diameter of the inner limiting ring (14) is larger than the outer diameter of the blocking head (33), the inner diameter of the valve opening chamber (113) is larger than the inner diameter of the inner limiting ring (14), and the outer diameter of the first sealing ring (71) is larger than the inner diameter of the valve opening chamber (113). Solenoid valve after Claim 18 , characterized in that the tappet body (32), the sealing chamber (111) and the valve opening chamber (113) are all cylindrical. Solenoid valve after Claim 18 , characterized in that the valve seat (10) comprises a main structure (13) and a third sealing ring (151), wherein the main structure (13) has the valve chamber (11) and a third sealing groove (161) is provided on the outer wall of the main structure (13), and wherein the third sealing ring (151) is arranged in the third sealing groove (161), wherein the third sealing ring (151) is arranged between the valve opening chamber (113) and the flow hole (17). Solenoid valve after Claim 1 , characterized in that the valve seat (10) comprises a valve cover (131) and a valve core (132), wherein the valve cover (131) has an installation chamber (133), and that one end of the valve sleeve (20) is introduced into the installation chamber (133), wherein the valve core (132) is firmly connected to the valve cover (131), wherein the valve core (132) has a valve chamber (11) and a valve opening (12) which are in communication with one another. Solenoid valve after Claim 23 , characterized in that the installation chamber (133) has a first installation hole (1331) and a second installation hole (1332) which communicate with each other, the radial dimension of the first installation hole (1331) being larger than the radial dimension of the second installation hole (1332), one end of the valve sleeve (20) is inserted into the first installation hole (1331), and the valve core (132) is guided through the second installation hole (1332). Solenoid valve after Claim 24 , characterized in that the second installation hole (1332) comprises a guide hole (13321) and a positioning hole (13322) which communicate with each other, the diameter of the positioning hole (13322) being larger than the Diameter of the guide hole (13321), wherein a second stop surface (192) is provided at the junction of the positioning hole (13322) and the guide hole (13321), and wherein the valve core (132) forms a stop fit with the second stop surface (192). Solenoid valve after Claim 25 , characterized in that the valve core (132) has a core sleeve (1321) and an outer limiting ring (1322) on the outer wall of the core sleeve (1321), wherein the core sleeve (1321) has the valve chamber (11) and the valve opening (12), wherein the core sleeve (1321) is guided through the guide hole (13321), the outer limiting ring (1322) is arranged in the positioning hole (13322), and the outer limiting ring (1322) abuts against the second stop surface (192). Solenoid valve after Claim 26 , characterized in that the valve core (132) further comprises a sealing ring (1323) on the outer wall of the core sleeve (1321), wherein a plurality of flow holes (17) are provided circumferentially on the side wall of the core sleeve (1321), and that each flow hole (17) is in communication with the valve chamber (11), wherein the plurality of flow holes (17) is arranged between the outer limiting ring (1322) and the sealing ring (1323). Solenoid valve after Claim 24 , characterized in that the outer wall of the valve sleeve (20) forms a limit fit with the inner wall of the first installation hole (1331), and that the end face of the valve sleeve (20) rests against the bottom of the first installation hole (1331). Solenoid valve after Claim 23 , characterized in that the valve core (132) comprises a core sleeve (1321) and an inner limiting ring (14), the core sleeve (1321) having the valve chamber (11) and the valve opening (12), and the inner limiting ring (14) is provided on the inner wall of the valve chamber (11); that the solenoid valve further comprises a first elastic element (61) which is placed on the valve tappet (30), one end of the first elastic element (61) abutting a step surface on the valve tappet (30) and the other end of the first elastic element (61) abutting the inner limiting ring (14). Solenoid valve after Claim 23 , characterized in that the valve seat (10) further comprises a third sealing ring (151) and a fourth sealing ring (152); that the outer wall of the valve cover (131) has a fourth sealing groove (162), wherein the fourth sealing ring (152) is arranged in the fourth sealing groove (162); that the outer wall of the valve core (132) has a third sealing groove (161), wherein the third sealing ring (151) is arranged in the third sealing groove (161); and that the side wall of the valve core (132) is provided with a flow hole (17) which communicates with the valve chamber (11), wherein the flow hole (17) is arranged between the third sealing ring (151) and the fourth sealing ring (152). Solenoid valve after Claim 23 , characterized in that the valve cover (131) comprises a sleeve body (1311) and a retaining ring (1312) on an outer wall of the sleeve body (1311), wherein the sleeve body (1311) has an installation chamber (133) and the sleeve body (1311) has an external thread.