CN212377352U

CN212377352U - Electromagnetic blowing valve

Info

Publication number: CN212377352U
Application number: CN202020504569.2U
Authority: CN
Inventors: 丁平
Original assignee: Ningbo Huagong Thermal Control Technology Co ltd
Current assignee: Ningbo Huagong Thermal Control Technology Co ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2021-01-19
Anticipated expiration: 2030-04-08

Abstract

The application discloses an electromagnetic blowing valve, which comprises a valve body with a pressure relief opening, an electromagnetic driving mechanism positioned outside the valve body, and an isolation assembly arranged on the valve body, wherein the isolation assembly and the valve body enclose a pressure relief cavity communicated with the pressure relief opening; keep apart the subassembly including sealed inserting the sleeve of establishing in the pressure release intracavity, and be fixed in the head in the sleeve, the head is seted up the isolation hole relative with the pressure release mouth, the movable iron core fixedly connected with valve rod among the electromagnetic drive mechanism, valve rod sliding seal's the isolation hole of passing is used for opening and close the pressure release mouth, this scheme is for prior art, keep apart the subassembly and keep apart second cavity and electromagnetic drive mechanism's cavity, avoid in the impurity among the medium gas can enter into electromagnetic drive mechanism, play the effect of the inside cavity of protection electromagnetic drive mechanism, guarantee that electromagnetic drive mechanism can smoothly work, the life of electromagnetism jetting valve has been improved greatly.

Description

Electromagnetic blowing valve

Technical Field

The application relates to the field of valves, in particular to an electromagnetic blowing valve.

Background

The electromagnetic blowing valve generally comprises a valve body, a diaphragm assembly and an electromagnetic driving mechanism, wherein the diaphragm assembly divides the interior of the valve body into a first cavity and a second cavity, a throttling port for communicating the first cavity with the second cavity is formed in the diaphragm assembly, and the electromagnetic driving mechanism can start to open and close a pressure relief port in the valve body.

When the electromagnetic driving mechanism seals the pressure relief opening, the medium gas enters from the inlet and is rapidly filled in the first cavity, and the other part of the medium gas enters the second cavity through the throttling opening on the diaphragm assembly, so that the pressure balance between the first cavity and the second cavity is achieved, namely the valve is in a closed state. When the electromagnetic driving mechanism is electrified, the electromagnetic driving mechanism opens the pressure relief port, and medium gas in the second cavity is rapidly exhausted through the pressure relief port, so that the pressure of the first cavity is far greater than that of the second cavity, the diaphragm assembly is opened, and the valve is in an opening state.

When the medium gas enters the valve, various impurities are inevitable in the medium gas, and the impurities can be attached to the inner surface of the valve body and enter the electromagnetic driving mechanism to block the work of the electromagnetic driving mechanism.

SUMMERY OF THE UTILITY MODEL

The application provides a pair of electromagnetism jetting valve for when solving in the medium gas admission valve among the prior art, impurity among the medium gas can attach in the valve body internal surface and enter into the electromagnetic drive mechanism, in order to hinder the technical problem of electromagnetic drive mechanism's work.

The application provides an electromagnetic blowing valve, which comprises a valve body with a pressure relief opening, an electromagnetic driving mechanism positioned outside the valve body, and an isolation assembly arranged on the valve body, wherein the isolation assembly and the valve body enclose a pressure relief cavity communicated with the pressure relief opening;

the isolation assembly comprises a sleeve which is inserted in the pressure relief cavity in a sealing mode and an end socket which is fixed in the sleeve, an isolation hole which is opposite to the pressure relief opening is formed in the end socket, a movable iron core in the electromagnetic driving mechanism is fixedly connected with a valve rod, and the valve rod penetrates through the isolation hole in a sliding sealing mode to open and close the pressure relief opening.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.

Optionally, a diaphragm assembly is arranged in the valve body, the diaphragm assembly divides the interior of the valve body into a first cavity and a second cavity, and a throttling port for communicating the first cavity with the second cavity is formed in the diaphragm assembly;

the first cavity is communicated with an inlet and an outlet of the valve body, and the second cavity is communicated with the pressure relief cavity; the inlet is communicated with the outlet through a valve port, and the diaphragm assembly can open and close the valve port.

Optionally, a sink groove located at the periphery of the isolation hole is formed in one side, facing the pressure relief cavity, of the end socket, and a sealing ring in sliding fit with the valve rod is arranged in the sink groove;

in the two opposite sides of the sealing ring along the axis direction of the valve rod, at least one side of the sealing ring is provided with a forked structure, one fork body in the forked structure is attached to the valve rod, and the other fork body is attached to the inner wall of the sinking groove.

Optionally, the isolation assembly further includes a separation prevention ring fixed to the sleeve, and the separation prevention ring limits the sealing ring in the sink groove and/or fixes the seal head in the sleeve.

Optionally, a limiting portion is convexly arranged on the inner wall of the sleeve, one side of the end socket, which is back to the pressure relief cavity, abuts against the limiting portion, and one side of the end socket, which faces the pressure relief cavity, abuts against the anti-drop ring;

one of the anti-drop ring and the end socket is provided with a positioning block, and the other end socket is provided with a positioning groove matched with the positioning block;

the inner wall of the sleeve is provided with a limiting groove, and the circumferential outer edge of the anti-drop ring extends into the limiting groove.

Optionally, the outer side wall of the sleeve is in sealing fit with the inner wall of the pressure relief cavity;

the axis of the sleeve and the axis of the valve rod are coincident.

Optionally, the bottom surface and/or the top surface of the end socket is provided with a weight reduction groove.

Optionally, a shaft shoulder is arranged on the outer side wall of the sleeve, and the valve body is provided with a stepped groove matched with the shaft shoulder;

the valve body is further fixed with an annular end cover located on the periphery of the sleeve, and the inner edge of the annular end cover is overlapped with the shaft shoulder to limit the shaft shoulder in the stepped groove.

Optionally, the electromagnetic driving mechanism includes:

a housing;

the fixed iron core is fixed in the shell and extends towards the valve body to form a mounting sleeve, and the mounting sleeve extends out of the shell and is fixedly inserted in the sleeve;

the coil is fixed in the shell and positioned on the periphery of the fixed iron core;

the movable iron core is movably arranged in the mounting sleeve in a penetrating manner, and the movable iron core drives a movable valve rod to open the pressure relief opening under the driving of the coil;

and the second elastic piece is used between the fixed iron core and the movable iron core and used for driving the movable iron core to drive the valve rod to seal the pressure relief opening.

Optionally, a sealing unit is disposed at one end of the valve rod, and the sealing unit includes:

the sealing head can open and close the pressure relief opening, one of the valve rod and the sealing head is provided with a positioning ring, and the other one of the valve rod and the sealing head is provided with a positioning groove matched with the positioning ring;

embrace and tightly overlap, it is fixed in to embrace and tightly overlap one end the valve rod just is in the one side of sealed head pressure release mouth dorsad, embrace and overlap the parcel tightly the periphery of sealed head just it extends to the one side of sealed head towards the pressure release mouth to embrace the cover tightly.

The utility model provides an electromagnetism jetting valve, the isolation subassembly is kept apart second cavity and electromagnetic drive mechanism's cavity, avoids in the impurity in the medium gas can enter into electromagnetic drive mechanism, plays the effect of the inside cavity of protection electromagnetic drive mechanism, guarantees that electromagnetic drive mechanism can smoothly work, has improved the life of electromagnetism jetting valve greatly.

Drawings

Figure 1 is a schematic structural view of an electromagnetic blow valve according to an embodiment provided herein;

figure 2 is a schematic diagram of an exploded structure of the electromagnetic blow valve of figure 1;

figure 3 is a cross-sectional view of the electromagnetic blow valve of figure 1;

FIG. 4 is a schematic view of a partial structure of the electromagnetic blow valve of FIG. 2;

FIG. 5 is an enlarged view of the portion A of FIG. 4;

FIG. 6 is a schematic view of the seal structure of FIG. 2;

FIG. 7 is a schematic view of the seal of FIG. 2;

fig. 8 is a schematic view of the anti-slip ring structure in fig. 2.

The reference numerals in the figures are illustrated as follows:

100. an electromagnetic blow valve;

10. a valve body; 11a, a first valve body; 11b, a second valve body; 111. fastening screws; 12. a pressure relief port; 13a, a first cavity; 13b, a second cavity; 14a, an inlet; 14b, an outlet; 15. a valve port; 16. a pilot channel;

20. an isolation component; 21. a sleeve; 211. a limiting part; 212. a limiting groove; 213. a shaft shoulder; 22. sealing the end; 221. sinking a groove; 222. positioning blocks; 223. a weight reduction groove; 23. a seal ring; 231. a bifurcated structure; 24. the anti-drop ring; 241. positioning a groove; 242. a bending part; 25. an annular end cap; 26. a screw;

30. a pressure relief cavity;

40. an electromagnetic drive mechanism; 41. a housing; 42. fixing an iron core; 43. a coil; 44. a movable iron core; 45. a second elastic member; 46. installing a sleeve;

50. a valve stem; 51. a sealing head; 511. a positioning ring; 52. a clasping sleeve;

60. a diaphragm assembly; 61. a choke; 62. a membrane; 63. a seal member; 631. a boss; 64. a first elastic member;

70. and (4) a flange.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In one embodiment, as shown in fig. 1 to 8, the present application provides an electromagnetic blowing valve 100, which includes a valve body 10 having a pressure relief opening 12, a diaphragm assembly 60 disposed in the valve body 10, and an electromagnetic driving mechanism 40 located outside the valve body 10, wherein the diaphragm assembly 60 divides the interior of the valve body 10 into a first cavity 13a and a second cavity 13b, the diaphragm assembly 60 has a throttle opening 61 communicating the first cavity 13a with the second cavity 13b, a movable iron core 44 in the electromagnetic driving mechanism 40 is fixedly connected to a valve rod 50, and the valve rod 50 is used for opening and closing the pressure relief opening 12.

The electromagnetic blowing valve 100 further comprises an isolation component 20 arranged on the valve body 10, and the isolation component 20 and the valve body 10 enclose a pressure relief cavity 30 communicated with the pressure relief opening 12;

the isolation assembly 20 includes a sleeve 21 sealingly inserted in the pressure relief cavity 30, and an end enclosure 22 fixed in the sleeve 21, the end enclosure 22 is provided with an isolation hole opposite to the pressure relief opening 12, a movable iron core 44 in the electromagnetic driving mechanism 40 is fixedly connected with a valve rod 50, and the valve rod 50 slidably and sealingly penetrates through the isolation hole to open and close the pressure relief opening 12.

The second cavity 13b is isolated from the cavity of the electromagnetic driving mechanism 40 by the isolating component 20, so that impurities in the medium gas can be prevented from entering the electromagnetic driving mechanism 40, the effect of protecting the inner cavity of the electromagnetic driving mechanism 40 is achieved, the electromagnetic driving mechanism 40 can work smoothly, and the service life of the electromagnetic blowing valve 100 is greatly prolonged.

The first cavity 13a is communicated with the inlet 14a and the outlet 14b of the valve body 10, and the second cavity 13b is communicated with the pressure relief cavity 30; the inlet 14a and the outlet 14b are communicated through a valve port 15, and the diaphragm assembly 60 can open and close the valve port 15.

The valve rod 50 passes through the isolation hole and can extend to the pressure relief opening 12 to open and close the pressure relief opening 12. When the electromagnetic driving mechanism 40 is not powered on, the valve rod 50 closes the pressure relief opening 12, the medium gas enters the first cavity 13a from the inlet 14a and then enters the second cavity 13b from the throttle opening 61 on the diaphragm assembly 60, the air pressure in the first cavity 13a is equal to the air pressure in the second cavity 13b, namely, the electromagnetic blowing valve 100 is in a closed state;

when the electromagnetic driving mechanism 40 is powered on, the movable iron core 44 drives the valve rod 50 to open the pressure relief opening 12, the medium gas in the second cavity 13b is rapidly discharged through the pressure relief opening 12, so that the pressure of the second cavity 13b is rapidly reduced, the air pressure in the first cavity 13a is far greater than the air pressure in the second cavity 13b, and the diaphragm assembly 60 is opened, that is, the valve port 15 is in an open state; when the electromagnetic driving mechanism 40 is powered off, the valve rod 50 closes the pressure relief opening 12, the pressure in the second cavity 13b is rapidly filled again, and the new balance is achieved, that is, the diaphragm assembly 60 is closed, and the valve port 15 is in a closed state.

In another embodiment, the bottom surface and/or the top surface of the head 22 are/is provided with weight-reducing grooves 223, the weight of the head 22 can be reduced by the weight-reducing grooves 223, so that the assembly and the operation of the head 22 are more convenient, of course, the number and the positions of the weight-reducing grooves 223 should firstly ensure the structural strength of the head 22, and the weight-reducing grooves 223 adopt a blind groove mode.

In the present embodiment, the lightening grooves 223 are fan-shaped and uniformly and annularly distributed on the end socket 22. Of course, in the embodiment, the weight-reducing grooves 223 may have other shapes or distributions, which will not be described herein.

In another embodiment, in order to make the structure of the electromagnetic blow valve 100 more compact, the first chamber 13a, the second chamber 13b, and the pressure relief chamber 30 are arranged in order in the axial direction of the valve stem 50.

The second cavity 13b is communicated with the pressure relief cavity 30 through a pilot channel 16, the pilot channel 16 extends along a straight line, and the extending direction of the pilot channel 16 is parallel to or forms an included angle with the axis of the valve rod 50.

Preferably, the pilot passage 16 extends in a direction parallel to the axis of the valve stem 50.

In another embodiment, the number of outlets 14b is two for ease of splitting by the customer.

In another embodiment, the valve body 10 is provided with a flange 70 at the inlet 14a and/or at least one outlet 14b in order to improve shock resistance when the electromagnetic blow valve 100 is connected to an external pipe.

In this embodiment, the valve body 10 is provided with a flange 70 at the inlet 14 a.

In another embodiment, in order to improve the sealing between the sealing head 22 and the valve rod 50, a sinking groove 221 located at the periphery of the isolation hole is formed in one side of the sealing head 22 facing the pressure relief cavity 30, and the sinking groove 221 is provided with a sealing ring 23 in sliding fit with the valve rod 50;

in order to prolong the service life of the sealing ring 23, at least one of two opposite sides of the sealing ring 23 along the axial direction of the valve rod 50 is provided with a branched structure 231, one fork body in the branched structure 231 is abutted against the valve rod 50, and the other fork body is abutted against the inner wall of the sinking groove 221.

In another embodiment, in order to secure the seal ring 23 to the head 22 and the head 22 to the sleeve 21, the isolation assembly 20 further comprises a release-preventing ring 24 secured to the sleeve 21, the release-preventing ring 24 restraining the seal ring 23 in the groove 221 and/or securing the head 22 to the sleeve 21.

In another embodiment, the inner wall of the sleeve 21 is convexly provided with a limiting portion 211, one side of the end socket 22, which is back to the pressure relief cavity 30, abuts against the limiting portion 211, and one side of the end socket 22, which faces the pressure relief cavity 30, abuts against the anti-drop ring 24.

In order to further enhance the sealing performance between the sealing head 22 and the sleeve 21, a sealing stopper is disposed between the sealing head 22 and the sleeve 21.

A limiting groove 212 is formed in the inner wall of the sleeve 21, and the circumferential outer edge of the anti-drop ring 24 extends into the limiting groove 212, so that the anti-drop ring 24 can be fixed in the sleeve 21;

wherein, the circumference outer fringe of anticreep ring 24 is buckled and is provided with a plurality of portions of bending 242, and the portion of bending 242 has certain elasticity, and when anticreep ring 24 was fixed in sleeve 21, the portion of bending 242 deformation so that anticreep ring 24 removed in sleeve 21, until the portion of bending 242 motion to spacing groove 212 position, the portion of bending 242 resets the joint in spacing groove 212, fixes anticreep ring 24 in sleeve 21.

Preferably, one of the anti-slip ring 24 and the end socket 22 is provided with a positioning block 222, and the other is provided with a positioning groove 241 matched with the positioning block 222;

in the present embodiment, the retaining ring 24 is provided with a positioning groove 241 on the side facing the seal head 22, and the seal head 22 is provided with a positioning block 222 on the side facing the retaining ring 24.

In another embodiment, the outer sidewall of the sleeve 21 sealingly engages the inner wall of the relief cavity 30. In order to further improve the sealing performance between the sleeve 21 and the inner wall of the pressure relief cavity 30, a plurality of sets of sealing rings are arranged between the sleeve 21 and the inner wall of the pressure relief cavity 30.

Wherein the axis of the sleeve 21 coincides with the axis of the valve stem 50.

In another embodiment, the outer side wall of the sleeve 21 is provided with a shaft shoulder 213, and the valve body 10 is provided with a stepped groove matched with the shaft shoulder 213;

the valve body 10 is further fixed with an annular end cover 25 at the outer periphery of the sleeve 21, and the inner edge of the annular end cover 25 overlaps the shoulder 213 to limit the shoulder 213 in the stepped groove. To facilitate removal of the isolator assembly 20, an annular end cap 25 is secured to the valve body 10 by screws 26.

In another embodiment, to facilitate the installation of the diaphragm assembly 60 in the valve body 10 and the processing of the valve body 10, the valve body 10 includes a first valve body 11a and a second valve body 11b that are fastened to each other, and the periphery of the diaphragm assembly 60 is clamped at the connection between the first valve body 11a and the second valve body 11 b.

When the first valve element 11a is engaged with the second valve element 11b, the first valve element 11a is fixed to the second valve element 11b by the fastening screw 111. In order to increase the sealing performance between the first valve body 11a and the second valve body 11b, a gasket is provided between the first valve body 11a and the second valve body 11 b.

The pressure relief port 12 is opened in the second valve body 11b, and the isolation assembly 20 and the second valve body 11b enclose a pressure relief cavity 30.

In another embodiment, the diaphragm assembly 60 includes:

a diaphragm 62 sandwiched between the first valve body 11a and the second valve body 11 b;

a sealing element 63 arranged on the diaphragm 62, wherein the sealing element 63 is matched with the valve port 15;

a first elastic member 64 disposed between the sealing member 63 and the inner wall of the second cavity 13b for urging the sealing member 63 to close the valve port 15.

When the pressure of the gas in the second chamber 13b is lower than the pressure in the first chamber 13a, the pressure in the first chamber 13a can deform the diaphragm 62 to drive the sealing member 63 to move away from the valve port 15, and the valve port 15 is in an open state. When the gas pressure in the first chamber 13a and the gas pressure in the second chamber 13b are in an equilibrium state, the sealing member 63 moves toward the valve port 15 under the action of the first elastic member 64 until the valve port 15 is sealed.

The fastening screw 111 passes through the first valve body 11a, the diaphragm 62 and the second valve body 11b in sequence to fix the diaphragm 62 between the first valve body 11a and the second valve body 11 b. The first elastic member 64 is used to enhance the sealing between the sealing member 63 and the valve port 15 when the electromagnetic blow valve 100 is in the closed state.

To facilitate the mounting of the first elastic member 64, the side of the sealing member 63 facing the second cavity 13b has a projection 631 engaged with the first elastic member 64.

In the present embodiment, the first elastic member 64 is a compression spring.

In another embodiment, the electromagnetic drive mechanism 40 includes:

a housing 41;

a fixed core 42 fixed in the case 41;

a coil 43 fixed in the housing 41 and located at the periphery of the fixed core 42, wherein the fixed core 42 extends toward the valve body 10 to form a mounting sleeve 46, and the mounting sleeve 46 extends out of the housing 41 and is fixedly inserted into the sleeve 21;

the movable iron core 44 is movably arranged in the mounting sleeve 46 in a penetrating way, and the movable iron core 44 drives the movable valve rod 50 to open the pressure relief opening 12 under the driving of the coil 43;

and the second elastic element 45 acts between the fixed iron core 42 and the movable iron core 44 and is used for driving the movable iron core 44 to drive the valve rod 50 to seal the pressure relief opening 12.

When the electromagnetic driving mechanism 40 is not electrified, the valve rod 50 on the movable iron core 44 seals the pressure relief opening 12, at this time, the pressure in the first cavity 13a is the same as the pressure in the second cavity 13b, and at this time, the electromagnetic blowing valve 100 is in a closed state;

when the electromagnetic driving mechanism 40 is powered on, the coil 43 generates a magnetic field when being powered on, the movable iron core 44 overcomes the external force and the second elastic element 45 to move upwards under the action of the magnetic field, and drives the valve rod 50 to open the pressure relief opening 12, at the moment, the pressure in the second cavity 13b becomes smaller, the pressure in the first cavity 13a is greater than the pressure in the second cavity 13b, the valve port 15 is opened when the sealing element 63 moves back to the valve port 15, at the moment, the inlet 14a is communicated with the outlet 14b through the valve port 15, and the electromagnetic blowing valve 100 is in an open state;

when the electromagnetic driving mechanism 40 is powered off, the magnetic field on the coil 43 disappears, the movable iron core 44 is reset under the action of the second elastic element 45, the pressure relief opening 12 is closed, and the sealing element 63 moves towards the valve opening 15 under the action of the first elastic element 64 until the valve opening 15 is sealed, so that the electromagnetic blowing valve 100 is in a closed state.

In another embodiment, a sealing unit is disposed at one end of the valve rod 50, and the sealing unit includes a sealing head 51, and the sealing head 51 can open and close the pressure relief opening 12.

In order to improve the sealing effect between the sealing head 51 and the pressure relief opening 12, the sealing head 51 is made of rubber or other materials, so that the sealing head 51 is in close contact with the periphery of the pressure relief opening 12.

Preferably, one of the valve stem 50 and the sealing head 51 is provided with a positioning ring 511, and the other is provided with a positioning groove 241 matched with the positioning ring 511.

The valve stem 50 is integrally formed with the retaining ring 511. So as to reduce the machining process between the valve stem 50 and the positioning ring 511 and enhance the structural strength between the valve stem 50 and the positioning ring 511. Of course, a separate fixing structure may be adopted between the valve stem 50 and the positioning ring 511, and the connection manner of the valve stem 50 and the positioning ring 511 is at least one of the following manners: the positioning ring 511 is fixed to the stem 50 by welding, and the positioning ring 511 is fixed to the stem 50 by screw-fitting.

In the present embodiment, the valve stem 50 is provided with a positioning ring 511, and the sealing head 51 is provided with a positioning groove 241 matching with the positioning ring 511.

In order to further increase the connection strength between the valve rod 50 and the sealing head 51, the sealing unit further includes a clasping sleeve 52, one end of the clasping sleeve 52 is fixed on the valve rod 50 and is located on one side of the sealing head 51, which faces away from the pressure relief opening 12, the clasping sleeve 52 wraps the periphery of the sealing head 51, and the clasping sleeve 52 extends to one side of the sealing head 51, which faces towards the pressure relief opening 12.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features. When technical features in different embodiments are represented in the same drawing, it can be seen that the drawing also discloses a combination of the embodiments concerned.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.

Claims

1. The electromagnetic blowing valve comprises a valve body with a pressure relief opening and an electromagnetic driving mechanism positioned outside the valve body, and is characterized by further comprising an isolation assembly arranged on the valve body, wherein the isolation assembly and the valve body enclose a pressure relief cavity communicated with the pressure relief opening;

2. The electromagnetic blowing valve of claim 1, wherein a diaphragm assembly is disposed in the valve body, the diaphragm assembly divides the interior of the valve body into a first chamber and a second chamber, and the diaphragm assembly has a choke that communicates the first chamber with the second chamber;

3. The electromagnetic blowing valve of claim 1, wherein a sink groove located at the periphery of the isolation hole is formed in one side of the sealing head facing the pressure relief cavity, and the sink groove is provided with a sealing ring in sliding fit with the valve rod;

4. The electromagnetic blow valve of claim 3, wherein the isolation assembly further comprises a slip-off ring secured to the sleeve, the slip-off ring trapping the seal ring within the counterbore and/or securing the head within the sleeve.

5. The electromagnetic blowing valve of claim 4, wherein a limiting portion is convexly disposed on the inner wall of the sleeve, a side of the sealing head facing away from the pressure relief cavity abuts against the limiting portion, and a side of the sealing head facing the pressure relief cavity abuts against the anti-drop ring;

6. The electromagnetic blow valve of claim 1, wherein an outer sidewall of the sleeve sealingly engages an inner wall of the pressure relief cavity;

the axis of the sleeve and the axis of the valve rod are coincident.

7. The electromagnetic blowing valve of claim 1, wherein the bottom surface and/or the top surface of the sealing head is provided with weight-reducing grooves.

8. The electromagnetic blowing valve of claim 1, wherein a shoulder is provided on an outer sidewall of the sleeve, and the valve body is provided with a stepped groove engaged with the shoulder;

9. The electromagnetic blow valve of claim 1, wherein the electromagnetic drive mechanism comprises:

a housing;

10. The electromagnetic blow valve of claim 1, wherein the valve stem is provided at one end with a sealing unit, the sealing unit comprising: