CN216158297U

CN216158297U - Electromagnetic valve

Info

Publication number: CN216158297U
Application number: CN202122199112.2U
Authority: CN
Inventors: 俞舟; 康志军
Original assignee: Zhejiang Dunan Artificial Environment Co Ltd
Current assignee: Zhejiang Dunan Artificial Environment Co Ltd
Priority date: 2021-09-10
Filing date: 2021-09-10
Publication date: 2022-04-01
Anticipated expiration: 2031-09-10

Abstract

The present invention provides a solenoid valve, comprising: a valve seat part which is provided with a valve cavity and a valve port which are communicated with each other; one end of the valve sleeve is connected with the valve seat part, and a cavity of the valve sleeve is communicated with an opening at one end of the valve cavity, which is far away from the valve port; the valve needle is movably arranged in the valve cavity in a penetrating way so as to seal or open the valve port; and the movable iron core is movably arranged in the cavity of the valve sleeve, and one end of the movable iron core is matched with one end of the valve needle in a stopping way. Through the technical scheme provided by the utility model, the problems that the movable iron core is connected with the valve needle, the flexibility is poor and the movable iron core has a blocking risk in the prior art can be solved.

Description

Electromagnetic valve

Technical Field

The utility model relates to the technical field of electromagnetic valves, in particular to an electromagnetic valve.

Background

In the electromagnetic valve in the prior art, the valve needle and the movable iron core are connected together in riveting and other modes, and the valve needle is driven to move by the movement of the movable iron core, so that the valve port is opened and closed.

The needle with move the iron core and connect the setting, overall structure's installation of being not convenient for, and connect the position and need assist the processing to guarantee the reliable and stable of connecting, and move the iron core and drive the needle common motion, move the flexibility of iron core motion poor, move the iron core and have the dead risk of card, be unfavorable for the use of solenoid valve.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electromagnetic valve, which aims to solve the problems that a movable iron core in the electromagnetic valve in the prior art is poor in flexibility and has a blocking risk.

In order to solve the above problems, the present invention provides a solenoid valve including: a valve seat part which is provided with a valve cavity and a valve port which are communicated with each other; one end of the valve sleeve is connected with the valve seat part, and a cavity of the valve sleeve is communicated with an opening at one end of the valve cavity, which is far away from the valve port; the valve needle is movably arranged in the valve cavity in a penetrating way so as to seal or open the valve port; and the movable iron core is movably arranged in the cavity of the valve sleeve, and one end of the movable iron core is matched with one end of the valve needle in a stopping way.

Further, the valve needle comprises a guide head, a rod body and a blocking head which are connected in sequence, the radial size of the rod body is smaller than that of the guide head and the blocking head, the outer side wall of the guide head is in limit fit with the inner side wall of the valve cavity, the guide head is in stop fit with one end of the movable iron core, and the blocking head is used for blocking or opening the valve port.

Furthermore, a limiting surface is arranged in the valve seat part, the electromagnetic valve further comprises a first elastic piece, the first elastic piece is sleeved on the rod body, one end of the first elastic piece is abutted against the guide head, and the other end of the first elastic piece is abutted against the limiting surface; when the valve port is opened, the blocking head is positioned outside the valve seat part.

Further, first elastic component is the spring, and the clearance between the inside wall of first elastic component and the lateral wall of the body of rod is greater than 0.3 mm.

Further, the valve seat part comprises a main body structure, an inner limiting ring and an annular sealing ring, the main body structure is provided with a valve cavity and a valve port, the outer side wall of the main body structure is provided with an annular sealing groove, and the annular sealing ring is positioned in the annular sealing groove; the inner limiting ring is arranged on the inner wall of the valve cavity, the surface of the inner limiting ring facing the first elastic piece forms a limiting surface, and the blocking head is abutted against the inner limiting ring under the condition that the valve port is closed.

Furthermore, the electromagnetic valve further comprises a first sealing ring, a first sealing groove is formed in the outer side wall of the blocking head, and the first sealing ring is arranged in the first sealing groove.

Furthermore, the valve seat part is also provided with a circulation hole communicated with the valve cavity, and the outer side wall of the guide head is provided with a second sealing groove; the electromagnetic valve also comprises a second sealing ring which is arranged in a second sealing groove, and the flow hole is positioned between the guide head and the valve port.

Furthermore, the guide head is provided with a first conical surface which is positioned on one side of the guide head far away from the rod body; the plugging head is provided with a second conical surface and a third conical surface, the second conical surface is positioned on one side of the plugging head facing the rod body, and the third conical surface is positioned on one side of the plugging head far away from the rod body; wherein the taper angle of the second conical surface is A, and A is more than or equal to 110 degrees and less than or equal to 170 degrees.

Furthermore, a positioning groove is formed in one end, facing the valve port, of the movable iron core, and one end of the valve needle is matched with the bottom wall of the positioning groove in a stopping mode; still have spigot surface and backstop face in the disk seat portion, the spacing cooperation of inside wall and the spigot surface of constant head tank, the diapire and the backstop face backstop cooperation of constant head tank.

Furthermore, the electromagnetic valve also comprises an attractor, the attractor is arranged in the valve sleeve and is positioned on one side of the movable iron core, which is far away from the valve seat part.

Furthermore, the electromagnetic valve also comprises a second elastic piece, and two ends of the second elastic piece are respectively abutted against the attractor and the movable iron core; the electromagnetic valve further comprises a first elastic piece, the first elastic piece is sleeved on the valve needle, and the elastic force of the second elastic piece is larger than that of the first elastic piece.

By applying the technical scheme of the utility model, the utility model provides the electromagnetic valve which comprises the following components: a valve seat part which is provided with a valve cavity and a valve port which are communicated with each other; one end of the valve sleeve is connected with the valve seat part, and a cavity of the valve sleeve is communicated with an opening at one end of the valve cavity, which is far away from the valve port; the valve needle is movably arranged in the valve cavity in a penetrating way so as to seal or open the valve port; and the movable iron core is movably arranged in the cavity of the valve sleeve, and one end of the movable iron core is matched with one end of the valve needle in a stopping way. By adopting the scheme, the valve needle and the movable iron core are arranged in a split manner, redundant auxiliary connection is not needed, the integral structure is convenient to install, and the manufacturability is good. And the movable iron core is not connected with the valve needle, so that the flexibility of the action of the movable iron core is improved, and the risk of the clamping of the movable iron core is reduced. And the valve needle is not connected with the movable iron core any more and moves along with the movable iron core, but is matched with the stop of the valve needle by controlling the movable iron core so as to control the opening and the closing of the valve port.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic structural diagram of a solenoid valve provided in an embodiment of the present invention;

FIG. 2 shows a schematic diagram of the valve needle in the solenoid valve of FIG. 1;

FIG. 3 illustrates a schematic view of the valve seat portion and valve sleeve assembly of the solenoid valve of FIG. 1;

FIG. 4 shows a schematic of the valve core in the valve seat portion of the solenoid valve of FIG. 1;

FIG. 5 shows a schematic structural view of a valve cover in a valve seat portion in the solenoid valve of FIG. 1;

fig. 6 is a schematic structural view showing the solenoid valve of fig. 1 in a valve-closed state.

Wherein the figures include the following reference numerals:

10. a valve seat portion; 11. a valve cavity; 12. a valve port; 13. a body structure; 14. an inner limiting ring; 15. an annular seal ring; 16. an annular seal groove; 17. a flow-through hole; 18. a guide surface; 19. a stop surface; 20. a valve housing; 30. a valve needle; 31. a guide head; 32. a rod body; 33. plugging a plug; 34. a first seal groove; 35. a second seal groove; 36. a first conical surface; 37. a second tapered surface; 38. a third conical surface; 40. a movable iron core; 41. positioning a groove; 50. an attractor; 61. a first elastic member; 62. a second elastic member; 71. a first seal ring; 72. and a second seal ring.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 6, an embodiment of the present invention provides a solenoid valve including: a valve seat portion 10, the valve seat portion 10 having a valve chamber 11 and a valve port 12 communicating with each other; a valve sleeve 20, one end of the valve sleeve 20 is connected with the valve seat part 10, and the cavity of the valve sleeve 20 is communicated with the opening of one end of the valve cavity 11, which is far away from the valve port 12; the valve needle 30 is movably arranged in the valve cavity 11 in a penetrating way, so as to seal or open the valve port 12; and the movable iron core 40 is movably arranged in the cavity of the valve sleeve 20, and one end of the movable iron core 40 is matched with one end stop of the valve needle 30.

In this embodiment, the valve needle 30 and the movable iron core 40 are separately arranged, so that redundant auxiliary connection is not required, the installation of the whole structure is facilitated, and the manufacturability is good. And the movable iron core 40 is not connected with the valve needle 30, so that the flexibility of the action of the movable iron core 40 is improved, and the risk of the clamping of the movable iron core 40 is reduced. The valve needle 30 is no longer connected with the plunger 40 and moves with the plunger 40 all the time, but the valve port 12 is controlled to be blocked or opened by controlling the plunger 40 to be matched with the stop of the valve needle 30.

Optionally, the valve seat portion 10 includes a valve cover and a valve core, the valve cover is connected with the valve sleeve 20, the valve core has a valve cavity 11 and a valve port 12, the valve cover and the valve core can be integrally formed, or the valve cover and the valve core can be fixedly connected after being separately formed.

As shown in fig. 2, the valve needle 30 includes a guiding head 31, a rod 32 and a blocking head 33, which are connected in sequence, wherein the radial dimension of the rod 32 is smaller than the radial dimensions of the guiding head 31 and the blocking head 33, the outer sidewall of the guiding head 31 is in limit fit with the inner sidewall of the valve cavity 11, the guiding head 31 is in stop fit with one end of the movable iron core 40, and the blocking head 33 is used for blocking or opening the valve port 12.

In the embodiment, the guide head 31 is movably disposed in the valve cavity 11, the guide head 31 is in stop fit with one end of the movable iron core 40, the movement of the guide head 31 is pushed by the movement of the movable iron core 40, and the outer side wall of the guide head 31 is in limit fit with the inner side wall of the valve cavity 11 to guide the movement of the valve needle 30 in the valve cavity 11, so as to prevent the valve needle 30 from shifting during the movement. The blocking head 33 moves along with the movement of the guide head 31, when the blocking head 33 moves to the outside of the valve port 12, the valve port 12 is in an open state, and when the blocking head 33 moves to the inside of the valve port 12, the valve port 12 is in a blocking state. By the arrangement, the valve needle 30 can move stably and is not easy to shake, the valve port 12 is sealed reliably, and the use performance of the electromagnetic valve is improved.

As shown in fig. 1 and 2, the valve seat portion 10 has a limiting surface therein, the solenoid valve further includes a first elastic member 61, the first elastic member 61 is sleeved on the rod body 32, one end of the first elastic member 61 abuts against the guide head 31, and the other end of the first elastic member 61 abuts against the limiting surface; when the valve port 12 is opened, the stopper 33 is located outside the valve seat portion 10.

In this embodiment, both ends of the first elastic member 61 respectively abut against the guide head 31 and the stopper surface, and the valve needle 30 is pushed to move toward the plunger 40 by the extension of the first elastic member 61, so that the blocking head 33 enters the valve port 12, thereby achieving the purpose of blocking the valve port 12. Set up like this, the spacing cooperation of the lateral wall of first elastic component 61 and the inside wall of valve seat portion 10, the inside wall of valve seat portion 10 plays certain guide effect to first elastic component 61, and the direction is effectual and do not rock the risk, makes the removal of needle 30 more reliable.

Specifically, when the electromagnetic valve is energized, the plunger 40 moves away from the valve seat portion 10 to generate a gap between the plunger 40 and the needle 30, and at this time, the first elastic member 61 abutting against the stopper surface in the valve seat portion 10 extends to push the guide head 31 abutting against the other end thereof to move toward the plunger 40, so that the entire needle 30 moves toward the plunger 40, and the stopper 33 enters the valve port 12 to block the valve port 12.

Specifically, the first elastic member 61 is a spring, and a gap between an inner side wall of the first elastic member 61 and an outer side wall of the rod body 32 is greater than 0.3 mm. By such an arrangement, it is ensured that the fluid in the solenoid valve can flow to the valve port 12 through the gap between the first elastic element 61 and the rod body 32, and the flow capacity of the solenoid valve is ensured.

Optionally, the inner diameter of the first elastic member 61 is greater than or equal to the outer diameter of the blocking head 33 and smaller than the outer diameter of the guiding head 31, so as to facilitate installation.

As shown in fig. 3 to 6, the valve seat portion 10 includes a main body structure 13, an inner limiting ring 14 and an annular sealing ring 15, the main body structure 13 has a valve cavity 11 and a valve port 12, an outer sidewall of the main body structure 13 has an annular sealing groove 16, and the annular sealing ring 15 is located in the annular sealing groove 16; the inner limiting ring 14 is arranged on the inner wall of the valve cavity 11, the surface of the inner limiting ring 14 facing the first elastic member 61 forms a limiting surface, and the blocking head 33 is abutted against the inner limiting ring 14 when the valve port 12 is closed.

In the present embodiment, the first elastic member 61 is restrained by providing the inner retainer ring 14 so that the first elastic member 61 is in a compressed state, thereby applying an elastic force to the needle 30. An annular sealing groove 16 is formed in the outer side wall of the main body structure 13, and an annular sealing ring 15 is arranged in the annular sealing groove 16 to ensure the sealing performance of the electromagnetic valve.

Specifically, there are two annular seal grooves 16 and two annular seal rings 15, the valve seat portion 10 includes a valve cover and a valve core, the two annular seal grooves 16 are respectively disposed on the valve cover and the valve core, the annular seal groove 16 disposed on the valve cover is a first annular seal groove 16, and the annular seal groove 16 disposed on the valve core is a second annular seal groove 16. When the electromagnetic valve is used, the electromagnetic valve is assembled on the connecting seat, an inlet cavity and an outlet cavity are formed in the connecting seat, the inlet cavity is communicated with a circulation hole 17 of the electromagnetic valve, the outlet cavity is communicated with a valve port 12 of the electromagnetic valve, one annular sealing ring 15 is arranged in a first annular sealing groove 16 to isolate the inlet cavity from the space outside the connecting seat, and the other annular sealing ring 15 is arranged in a second annular sealing groove 16 to isolate the inlet cavity from the outlet cavity, so that the sealing performance of the electromagnetic valve is improved.

As shown in fig. 1 and 2, the solenoid valve further includes a first sealing ring 71, the outer sidewall of the blocking head 33 has a first sealing groove 34, and the first sealing ring 71 is disposed in the first sealing groove 34. In this way, after the electromagnetic valve is powered on, the blocking head 33 moves towards the movable iron core 40 and enters the valve port 12, the first sealing ring 71 arranged on the blocking head 33 enters the valve port 12, and the outer side wall of the first sealing ring 71 is in sealing fit with the inner side wall of the valve port 12. The valve port 12 is sealed by the first sealing ring 71, and the reliability of sealing is ensured. Optionally, the sealing form of the first sealing ring 71 adopts soft sealing, so that the blocking effect is better.

Specifically, the valve seat portion 10 further has a flow hole 17 communicating with the valve chamber 11, and the outer side wall of the guide head 31 has a second seal groove 35; the solenoid valve further comprises a second sealing ring 72, wherein the second sealing ring 72 is arranged in the second sealing groove 35, and the flow hole 17 is positioned between the guide head 31 and the valve port 12.

In this embodiment, the fluid enters the valve chamber 11 through the flow hole 17, the flow hole 17 is located between the guide head 31 and the valve port 12, and the second sealing ring 72 is disposed in the second sealing groove 35 on the outer side wall of the guide head 31 to seal off the area of the valve chamber 11 where the guide head 31 is located.

Specifically, when the fluid enters the valve cavity 11 through the flow hole 17, the fluid will move towards the valve port 12 and the position of the guide head 31, respectively, and the fluid flowing to the position of the guide head 31 cannot continue to flow towards the valve sleeve 20 by being blocked by the second sealing ring 72, so as to prevent the fluid from entering the cavity of the valve sleeve 20 and affecting the use of the solenoid valve.

Optionally, the sealing form of the second sealing ring 72 is soft sealing, so that the plugging effect is good. Optionally, there are two second seal grooves 35, and there are two correspondingly disposed second seal rings 72, so as to enhance the sealing effect.

Furthermore, the guide head 31 is provided with a first tapered surface 36, and the first tapered surface 36 is positioned on the side of the guide head 31 far away from the rod body 32; the blocking head 33 is provided with a second conical surface 37 and a third conical surface 38, the second conical surface 37 is positioned on the side of the blocking head 33 facing the rod body 32, and the third conical surface 38 is positioned on the side of the blocking head 33 away from the rod body 32; wherein the taper angle of the second conical surface 37 is A, and A is more than or equal to 110 degrees and less than or equal to 170 degrees.

In this embodiment, the first tapered surface 36 is provided to guide the valve needle 30 when moving toward the plunger 40, and to facilitate installation of the second seal 72. By arranging the second conical surface 37, a certain guiding effect is realized on the fluid flowing out of the valve port 12, and the fluid resistance is reduced; through setting up third conical surface 38, conveniently wear to establish the installation. The taper angle of the second conical surface 37 is A, A is larger than or equal to 110 degrees and smaller than or equal to 170 degrees, the circulation capacity of the second conical surface 37 is better in the range, and the impact force of the fluid on the blocking head 33 is smaller.

As shown in fig. 6, the plunger 40 has a positioning groove 41 at an end facing the valve port 12, and an end of the needle 30 is in stop fit with a bottom wall of the positioning groove 41; the valve seat portion 10 further has a guide surface 18 and a stop surface 19 therein, wherein the inner sidewall of the positioning groove 41 is in stop fit with the guide surface 18, and the bottom wall of the positioning groove 41 is in stop fit with the stop surface 19.

In this embodiment, the plunger 40 is provided with a positioning groove 41 at one end facing the valve port 12, a part of the valve seat portion 10 is always positioned in the positioning groove 41, the plunger 40 is movably provided in the valve housing 20, and the guide surface 18 in the valve seat portion 10 guides the plunger 40 in the moving process of the plunger 40, thereby preventing the movement of the plunger 40 from being deviated. When the plunger 40 moves toward the valve port 12, the bottom wall of the positioning groove 41 is in stop engagement with the stop surface 19 in the valve seat portion 10 to prevent the plunger 40 from moving further. By means of the arrangement, the positioning groove 41 limits the movement of the movable iron core 40, and the movable iron core 40 is prevented from deviating in the moving process so as to influence the use of the electromagnetic valve.

Specifically, the bottom wall of the positioning groove 41 also cooperates with an end stop of the valve needle 30. When the electromagnetic valve is electrified, the inner side wall of the positioning groove 41 is in limit fit with the guide surface 18; when the electromagnetic valve is powered off and the electromagnetic valve is opened from closing, the movable iron core 40 moves towards the valve port 12 and abuts against one end of the valve needle 30 to push the valve needle 30 to move, the guide surface 18 always guides the movable iron core 40 in the moving process, when the movable iron core 40 moves to the bottom wall of the positioning groove 41 to be matched with the stop surface 19 in a stop mode, the movable iron core 40 does not move continuously, and at the moment, the movable iron core 40 is matched with the stop surface 19 in a stop mode and also matched with one end of the valve needle 30, namely one end of the guide head 31 in a stop mode.

Further, the electromagnetic valve further comprises an attractor 50, the attractor 50 is arranged in the valve housing 20, and the attractor 50 is located on the side of the plunger 40 away from the valve seat portion 10. When the electromagnetic valve is electrified, the attractor 50 generates magnetic force to attract the movable iron core 40, so that the movable iron core 40 and the attractor 50 are attracted; when the solenoid valve is de-energized, the plunger 40 moves away from the attractor 50 and into stop engagement with the valve seat 10.

Further, the electromagnetic valve further comprises a second elastic piece 62, and two ends of the second elastic piece 62 are respectively abutted against the attractor 50 and the movable iron core 40; the electromagnetic valve further comprises a first elastic part 61, the first elastic part 61 is sleeved on the valve needle 30, and the elastic force of the second elastic part 62 is greater than that of the first elastic part 61, so that the electromagnetic valve can be normally opened.

Alternatively, the second elastic member 62 is a spring, one end of which is disposed in the plunger 40 and the other end of which abuts against the attractor 50.

Specifically, after the electromagnetic valve is de-energized, the attractor 50 no longer attracts the movable iron core 40, the second elastic member 62 in the compressed state extends to push the movable iron core 40 in the direction away from the attractor 50, during the pushing process, the bottom wall of the positioning groove 41 in the movable iron core 40 abuts against one end of the guide head 31 of the valve needle 30, the movable iron core 40 pushes the valve needle 30 to move, the valve needle 30 is sleeved with the first elastic member 61, one end of the first elastic member 61 abuts against the inner limit ring 14 in the valve seat portion 10, and the other end abuts against the guide head 31 in the valve needle 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 needle 30 and the movable iron core 40 move in the direction away from the attractor 50 by the elastic force of the second elastic member 62, the first elastic member 61 sleeved on the valve needle 30 is compressed until the bottom wall of the positioning groove 41 in the movable iron core 40 abuts against the stop surface 19 of the valve seat portion 10, and the second elastic member 62 stops extending, the plunger 40 and the needle 30 stop moving, the first elastic member 61 stops compressing, and at this time, the stopper 33 moves to the outside of the valve port 12, and the valve port 12 is opened.

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:

a valve seat portion (10), the valve seat portion (10) having a valve cavity (11) and a valve port (12) that communicate with each other;

a valve sleeve (20), wherein one end of the valve sleeve (20) is connected with the valve seat part (10), and a cavity of the valve sleeve (20) is communicated with an opening of one end of the valve cavity (11) which is far away from the valve port (12);

a valve needle (30), wherein the valve needle (30) is movably arranged in the valve cavity (11) in a penetrating way to close or open the valve port (12);

the movable iron core (40) is movably arranged in the cavity of the valve sleeve (20), and one end of the movable iron core (40) is matched with one end of the valve needle (30) in a stopping mode.

2. The electromagnetic valve according to claim 1, characterized in that the valve needle (30) comprises a guide head (31), a rod body (32) and a blocking head (33) which are connected in sequence, the radial dimension of the rod body (32) is smaller than the radial dimensions of the guide head (31) and the blocking head (33), the outer side wall of the guide head (31) is in limit fit with the inner side wall of the valve cavity (11), the guide head (31) is in stop fit with one end of the plunger (40), and the blocking head (33) is used for blocking or opening the valve port (12).

3. The solenoid valve according to claim 2, wherein the valve seat portion (10) has a limiting surface therein, the solenoid valve further comprises a first elastic member (61), the first elastic member (61) is sleeved on the rod body (32), one end of the first elastic member (61) abuts against the guide head (31), and the other end of the first elastic member (61) abuts against the limiting surface; when the valve port (12) is open, the plug (33) is located outside the valve seat portion (10).

4. A solenoid valve according to claim 3, characterised in that said first elastic element (61) is a spring, the clearance between the inner side wall of said first elastic element (61) and the outer side wall of said rod (32) being greater than 0.3 mm.

5. The solenoid valve according to claim 3, characterized in that the valve seat (10) comprises a main body structure (13), an inner limiting ring (14) and an annular sealing ring (15), the main body structure (13) has the valve cavity (11) and the valve port (12), the outer side wall of the main body structure (13) has an annular sealing groove (16), and the annular sealing ring (15) is located in the annular sealing groove (16); the inner limiting ring (14) is arranged on the inner wall of the valve cavity (11), the surface of the inner limiting ring (14) facing the first elastic piece (61) forms the limiting surface, and the blocking head (33) is abutted against the inner limiting ring (14) when the valve port (12) is closed.

6. The solenoid valve of claim 2, further comprising a first seal ring (71), the outer sidewall of the blocking head (33) having a first seal groove (34), the first seal ring (71) disposed within the first seal groove (34).

7. The solenoid valve according to claim 2, characterized in that the valve seat portion (10) further has a flow hole (17) communicating with the valve chamber (11), and the guide head (31) has a second seal groove (35) on an outer side wall thereof; the electromagnetic valve further comprises a second sealing ring (72), the second sealing ring (72) is arranged in the second sealing groove (35), and the flow hole (17) is located between the guide head (31) and the valve port (12).

8. The solenoid valve according to claim 2, characterized in that said guide head (31) has a first tapered surface (36), said first tapered surface (36) being located on the side of said guide head (31) remote from said stem (32); the blocking head (33) is provided with a second conical surface (37) and a third conical surface (38), the second conical surface (37) is positioned on one side, facing the rod body (32), of the blocking head (33), and the third conical surface (38) is positioned on one side, away from the rod body (32), of the blocking head (33); wherein the taper angle of the second conical surface (37) is A, and A is more than or equal to 110 degrees and less than or equal to 170 degrees.

9. The solenoid valve according to claim 1, characterized in that the plunger (40) is provided with a positioning groove (41) at an end facing the valve port (12), and an end of the needle (30) is in stop fit with a bottom wall of the positioning groove (41); still have spigot surface (18) and backstop face (19) in seat of valve portion (10), the inside wall of constant head tank (41) with spigot surface (18) spacing cooperation, the diapire of constant head tank (41) with backstop face (19) backstop cooperation.

10. The solenoid valve of claim 1 further comprising an attractor (50), the attractor (50) being disposed within the valve housing (20), the attractor (50) being located on a side of the plunger (40) away from the valve seat portion (10).

11. The solenoid valve according to claim 10, characterized in that it further comprises a second elastic member (62), two ends of said second elastic member (62) respectively abut against said attractor (50) and said plunger (40); the electromagnetic valve further comprises a first elastic part (61), the first elastic part (61) is sleeved on the valve needle (30), and the elastic force of the second elastic part (62) is larger than that of the first elastic part (61).