CN115199760A

CN115199760A - Double-suspension structure electromagnetic valve and working method

Info

Publication number: CN115199760A
Application number: CN202210823803.1A
Authority: CN
Inventors: 葛赛; 胡兆华; 于传富; 张耀新; 高磊; 振前; 李萌; 胡飞强; 邓凯; 周小雯
Original assignee: Henan Aerospace Hydraulic and Pneumatic Technology Co Ltd
Current assignee: Henan Aerospace Hydraulic and Pneumatic Technology Co Ltd
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2022-10-18

Abstract

The invention relates to the technical field of electromagnetic valves, in particular to an electromagnetic valve with a double-suspension structure and a working method thereof, and solves the problem of friction loss of the electromagnetic valve in the prior art. The electromagnetic valve with the double-suspension structure comprises an electromagnet assembly and a valve core assembly, wherein an inlet pipe and an outlet pipe are respectively arranged at two ends of the electromagnet assembly, a valve rod is arranged in the electromagnet assembly, one end, corresponding to the inlet pipe, of the valve rod is connected with the electromagnet assembly through an auxiliary elastic piece, one end, corresponding to the outlet pipe, of the valve rod is connected with the electromagnet assembly through a main elastic piece, the valve rod is connected with the electromagnet assembly through the auxiliary elastic piece and the main elastic piece to form the double-suspension supporting structure, an armature is arranged on the valve rod in an interference fit mode, and the valve core assembly is arranged at the outer end portion of the armature and is in contact fit with the outlet pipe. The electromagnetic valve realizes a suspension structure by means of radial supporting force of the two diaphragm springs at the two ends of the valve rod, and the armature and the valve rod are in interference fit to form an integral structure, so that an armature suspension type motion mode is achieved, and motion friction force is reduced.

Description

Double-suspension-structure electromagnetic valve and working method

Technical Field

The invention relates to the technical field of electromagnetic valves, in particular to an electromagnetic valve with a double-suspension structure and a working method.

Background

At present, the axial-flow normally-closed electromagnetic valve in domestic market has the highest service life of only 10 ten thousand times, and in the opening and closing process of the electromagnetic valve, the surface smoothness of parts can be influenced by the movement abrasion between the armature and the coil framework, so that the movement resistance is increased, the phenomenon of unsmooth opening and closing is caused, and the service life of the product is shortened; the existing electromagnetic valve product adopts a method of increasing the gap between the armature and the coil framework to achieve the purposes of smooth movement of the armature and reduction of movement abrasion, but the increase of the gap can increase the dislocation of the pressing position of the valve core which is opened and closed each time, influence is generated on the sealing performance, and the service life of the product is reduced; when the valve is opened, the impact force of the sealing surface to the valve core sealing block damages the valve core sealing block, and along with the increase of the use times, the deformation of the valve core caused by the impact force at each time is superposed to influence the sealing performance of the product, thereby reducing the service life of the product.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the electromagnetic valve with the double-suspension structure and the working method thereof, and solves the problem of friction loss of the electromagnetic valve in the prior art.

The technical scheme of the invention is realized as follows: the utility model provides a two suspended structure solenoid valves, includes electromagnet assembly and case subassembly, electromagnet assembly's both ends are equipped with import pipe and outlet pipe respectively, are equipped with the valve rod in the electromagnet assembly, and the valve rod is connected with electromagnet assembly through vice elastic component with the corresponding one end of import pipe, and the valve rod is connected with electromagnet assembly through main elastic component with the corresponding one end of outlet pipe, and the valve rod passes through vice elastic component, and main elastic component is connected with electromagnet assembly and forms two suspended support structure, and interference fit is equipped with armature on the valve rod, and the case subassembly sets up at the outer tip of armature and with outlet pipe contact fit.

The auxiliary elastic part and the main elastic part are both diaphragm springs; the valve rod is made of titanium alloy material.

The electromagnet assembly comprises a coil framework and a coil, the coil is wound in the middle of the coil framework, and a through hole for the valve rod to pass through is formed in the coil framework.

The coil framework is connected with the inlet pipe in a sealing manner to form a left floating cavity, and the coil framework is connected with the outlet pipe in a sealing manner to form a right floating cavity; the auxiliary elastic piece is positioned in the left floating cavity, a filter is arranged between the valve rod and the inlet pipe, and the filter is positioned in the left floating cavity; the main elastic piece and the valve core assembly are located in the right floating cavity.

The middle part of the auxiliary elastic part is connected to the end part of the valve rod through an inner hexagon screw, and the outer edge part of the auxiliary elastic part is clamped between the coil framework and the inlet pipe; the middle part of the main elastic part is clamped between the valve core assembly and the armature, the outer edge part of the main elastic part is clamped between the coil framework and the outlet pipe, gaskets are arranged on two sides of the main elastic part, and the inner hexagon screw is made of titanium alloy materials.

The coil framework comprises an inlet base body and an outlet base body, the outlet base body is connected with the inlet base body through a middle magnetism isolating ring lapped on the inlet base body, and the middle magnetism isolating ring is fixedly connected with the inlet base body in a sealing mode; the through hole is formed in the end part, close to the outlet base body, of the inlet base body, the inner diameter of the outlet base body is equal to the inner diameter of the middle magnetism isolating ring and is larger than the diameter of the through hole, the end part, close to the outlet base body, of the inlet base body, the middle magnetism isolating ring and the outlet base body form an armature cavity, an armature is located in the armature cavity, and a magnetism isolating gasket is arranged between the armature and the end part, close to the outlet base body, of the inlet base body; a gap is reserved between the armature and the inner annular surface of the armature cavity.

The coil framework is coaxially arranged with the inlet pipe and the outlet pipe; a reducing channel is arranged in the inlet pipe, and an inlet section channel and an outlet section channel of the reducing channel are both conical channels; the outlet pipe is internally provided with a gradual change channel, and the diameter of the gradual change channel is increased in a sectional mode along the flowing direction of the medium.

The valve core assembly comprises a valve core base body fixed on the valve rod, a sealing block is arranged in the valve core base body and fixed on the valve core base body through a pressing block, and a rubber block is arranged between the sealing block and the valve core base body; the valve core base body is made of titanium alloy material.

And an arc sealing surface is arranged at the air inlet of the outlet pipe, and the liquid inlet of the outlet pipe is closed when the arc sealing surface is in surface-to-surface contact fit with the sealing block.

A working method of the electromagnetic valve with the double suspension structures comprises the following steps: s1: two ends of the valve rod are supported by the main elastic piece and the auxiliary elastic piece to form a double-suspension supporting structure; the armature iron positioned on the valve rod forms a suspension armature iron;

s2: under a normal state, the coil of the electromagnet assembly is powered off, the valve rod is in a closed position under the pre-tightening force action of the main elastic piece and the auxiliary elastic piece, and the valve core assembly is tightly pressed on the sealing surface of the outlet pipe to complete the closing action of the electromagnetic valve;

s3: under the working state, a coil of the electromagnet assembly is electrified, the suspension type armature performs suspension type movement under the action of electromagnetic force generated by the electromagnet assembly, the valve rod overcomes the pre-tightening force of the main elastic piece and the auxiliary elastic piece under the action of the armature and moves to the opening position, and the valve core assembly is separated from the sealing surface of the outlet pipe to complete the opening action of the electromagnetic valve;

s4: and (5) repeating the step (S2) to finish the closing action of the electromagnetic valve.

The electromagnetic valve realizes a suspension structure by means of radial supporting force of the two diaphragm springs at the two ends of the valve rod, and the armature and the valve rod are in interference fit to form an integral structure, so that an armature suspension type movement mode is achieved, compared with the traditional electromagnetic valve structure, the electromagnetic valve increases the clearance between the armature and a coil frame, reduces the movement friction force, and ensures the purpose of prolonging the service life of a product; the supporting force of the two diaphragm springs is relied on, the displacement of the valve core in the radial direction is controlled, the influence of the dislocation problem that the indentations are not coincident when the sealing block and the valve seat are sealed on the sealing performance is avoided, and the sealing performance of the product is ensured. The titanium alloy material is selected for use by the inner hexagon screws on the valve rod, the valve core substrate and the valve rod end head, so that the purpose of reducing weight of a moving part can be realized, good corrosion resistance, toughness and strength can be ensured, the equivalent stress of the reed spring can be reduced, the service life of the spring is prolonged, and the purpose of prolonging the service life of a product is further achieved.

Drawings

In order to illustrate the embodiments of the invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.

Fig. 1 is a schematic view of the overall structure of the solenoid valve of the present invention.

Fig. 2 is a schematic structural view of the valve core assembly of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 1, embodiment 1 is a dual suspension structure solenoid valve, including an electromagnet assembly 2 and a valve core assembly 5, where two ends of the electromagnet assembly 2 are respectively provided with an inlet pipe 1 and an outlet pipe 6, and a medium enters the electromagnet assembly through the inlet pipe and then flows out through the outlet pipe. A valve rod 3 is arranged in the electromagnet assembly 2, and the valve rod can move in the electromagnet assembly in the axial direction to open and close the electromagnetic valve. One end of the valve rod 3 corresponding to the inlet pipe 1 is connected with the electromagnet assembly 2 through an auxiliary elastic part 10; the auxiliary elastic piece provides radial auxiliary supporting force and axial auxiliary pre-tightening force of the valve rod, and one end of the valve rod 3, which corresponds to the outlet pipe 6, is connected with the electromagnet assembly 2 through the main elastic piece 7; the same main elastic piece provides radial main supporting force and axial main pretightening force of the valve rod. Structurally valve rod 3 is connected through vice elastic component 10, main elastic component 7 and electromagnet assembly 2 and forms two suspension bearing structure, and interference fit is equipped with armature 4 on the valve rod 3, and armature setting forms floated armature on two suspension bearing structure, and under the electromagnet assembly effect, floated armature carries out the motion of suspending, thereby reduces the case and opens the friction loss that the part motion produced when closing and reach the purpose that increases life-span. The valve core assembly 5 is arranged at the outer end of the armature 4 and is in contact fit with the outlet pipe 6 to form a switch port of the electromagnetic valve, the valve core assembly 5 is separated from the sealing surface of the outlet pipe 6, the electromagnetic valve is opened, and the medium circulates. The valve core assembly 5 is sealed with the surface of the outlet pipe 6, and the electromagnetic valve is closed.

As a preselection mode, the auxiliary elastic part 10 and the main elastic part 7 are both diaphragm springs, and the auxiliary elastic part and the main elastic part are matched to provide radial supporting force and axial pretightening force of the valve rod, so that the dislocation problem that the press marks are not coincident when the sealing block and the valve seat are sealed is avoided, and the sealing performance of the valve is ensured. The valve rod 3 is made of titanium alloy material, so that the purpose of reducing weight of a moving part can be realized, and good corrosion resistance, toughness and strength can be ensured.

In this embodiment, the electromagnet assembly 2 includes a bobbin 21 and a coil 22, the coil 22 is wound around the middle of the bobbin 21, a through hole 23 for the valve rod 3 to pass through is formed in the bobbin 21, and the through hole 23 is a movement passage for the valve rod 3 and also a passage for medium to flow through in the electromagnet assembly. The coil former 21 is sealingly connected to the inlet tube 1 to form the left floating chamber 12, preferably in the form of a solid laser weld 521. The coil framework 21 is hermetically connected with the outlet pipe 6 to form a right floating cavity 13; the sealing connection of the bobbin 21 to the outlet tube 6 can be made by screwing or welding, again preferably by solid laser welding, the welding point being indicated by 521. The two ends of the valve rod are respectively positioned in the left floating cavity and the right floating cavity to form a double-head suspension structure, so that friction contact points and friction are reduced. The auxiliary elastic part 10 is located in the left floating cavity 12, and the left floating cavity provides a deformation space for the auxiliary elastic part so as to provide enough radial supporting force and axial pretightening force for the valve rod. A filter 11 is arranged between the valve rod 3 and the inlet pipe 1, the filter 11 is located in the left floating cavity 12, and the filter is used for filtering impurities of media and improving the cleanliness of the media entering the electromagnet assembly. The main elastic part 7 and the valve core assembly 5 are positioned in the right floating cavity 13; the right floating cavity 13 provides a deformation space for the main elastic element so as to provide enough radial supporting force and axial pretightening force for the valve rod.

As shown in fig. 2, in embodiment 2, based on embodiment 1, the middle part of the secondary elastic element 10 is connected to the end part of the valve rod 3 through an inner hexagon screw 9, and the inner hexagon screw 9 is a screw made of a titanium alloy material, so as to achieve the purpose of reducing the weight of the moving element. The outer edge portion of the sub elastic member 10 is caught between the bobbin 21 and the inlet tube 1. The middle part of the main elastic part 7 is clamped between the valve core assembly 5 and the armature 4, the outer edge part of the main elastic part 7 is clamped between the coil framework 21 and the outlet pipe 6, and gaskets 8 are arranged on two sides of the main elastic part 7. The directions of the axial pretightening forces generated by the main elastic part 7 and the auxiliary elastic part 10 are the same, and the pretightening forces are superposed to improve the sealing force of the valve core assembly.

In this embodiment, the coil bobbin 21 includes an inlet substrate 21-1 and an outlet substrate 21-2, the outlet substrate 21-2 is connected to the inlet substrate 21-1 through a middle magnetism isolating ring 21-3 overlapped on the inlet substrate 21-1, and the middle magnetism isolating ring 21-3 is fixedly connected to the inlet substrate 21-1 in a sealing manner, preferably by welding. The through hole 23 is arranged at the end part of the inlet base body 21-1 close to the outlet base body 21-2, the inner diameter of the outlet base body 21-2 is equal to the inner diameter of the middle magnetism isolating ring 21-3, and the inner diameters of the middle magnetism isolating ring and the outlet magnetism isolating ring are both larger than the diameter of the through hole 23, so that a stepped hole structure is formed. The end part of the inlet base body 21-1 close to the outlet base body 21-2, the middle magnetism isolating ring 21-3 and the outlet base body 21-2 form an armature cavity, the armature 4 is positioned in the armature cavity, and a magnetism isolating gasket 14 is arranged between the armature and the end part of the inlet base body 21-1 close to the outlet base body 21-2; a gap is reserved between the armature 4 and the inner ring surface of the armature cavity; compared with the traditional electromagnetic valve structure, the gap between the armature (serial number 2) and the coil framework is increased, the motion friction force is reduced, and the purpose of prolonging the service life of the product is ensured.

In this embodiment, the coil bobbin 21 is coaxially disposed with the inlet pipe 1 and the outlet pipe 6, so as to ensure smooth medium circulation. A reducing channel is arranged in the inlet pipe 1, and an inlet section channel and an outlet section channel of the reducing channel are both conical channels; a gradual change channel is arranged in the outlet pipe 6, and the diameter of the gradual change channel becomes larger in a sectional mode along the flowing direction of the medium; namely, the gradual change channel in the outlet pipe 6 is divided into three sections, namely an inlet section channel, a flow section channel and an outlet section channel, the diameter of the flow section channel is larger than that of the outlet section channel of the inlet section channel, the outlet section channel of the outlet pipe 6 is a trumpet-shaped opening, the pressure intensity is gradually reduced, and the flow rate is gradually increased in the medium outflow process. The conical channel and the trumpet-shaped opening are both 37-degree conical surface standard joints, and the sealing performance is improved.

The valve core assembly 5 in this embodiment includes a valve core base 51 fixed on the valve rod 3, and the valve core base is connected to the valve rod by a key or by a screw thread or by an interference fit. A sealing block 52 is arranged in the valve core base body 51, the sealing block 52 is fixed on the valve core base body 51 through a pressing block 53, and a rubber block 54 is arranged between the sealing block 52 and the valve core base body 51; the valve core base body 51 is a base body made of titanium alloy material. Through the mode of placing the rubber piece that increases, utilize the soft, elastic performance advantage of rubber piece material, turn into the elastic potential energy of rubber piece with the impact force that produces between case and the sealed face in the product working process that opens and shuts, reduce the impact to sealed piece to reduce sealed piece impact deformation, produce surface defect's possibility, and then guarantee product sealing performance.

Further, an arc sealing surface 61 is arranged at the air inlet of the outlet pipe 6, the surface of the arc sealing surface 61 corresponding to the sealing block 52 is a sealing surface, and when the arc sealing surface 61 is in surface-to-surface contact fit with the sealing block 52, the liquid inlet of the outlet pipe 6 is closed. When the sealing block 52 is separated from the arc sealing surface 61, the liquid inlet of the outlet pipe 6 is opened. 3. According to the verification of the test result of the service life of the sample piece product, the service life of the electromagnetic valve with the double-suspension structure can reach 100 ten thousand times, the service life of the product is prolonged on the basis of ensuring the sealing performance of the product, and the development requirement is met.

Example 3: an operating method of the electromagnetic valve with the double suspension structure in the embodiment 2 includes the following steps: s1: two ends of the valve rod 3 are supported by the main elastic part 7 and the auxiliary elastic part 10 to form a double-suspension supporting structure; the armature 4 on the valve stem 3 forms a floating armature. Compared with the traditional electromagnetic valve structure, the gap between the armature (serial number 2) and the coil framework is increased, and the motion friction force is reduced.

S2: under the normal state, the coil of the electromagnet assembly 2 is powered off, the valve rod 3 is in the closing position under the action of the pretightening force of the main elastic part 7 and the auxiliary elastic part 10, and the valve core assembly 5 is tightly pressed on the sealing surface of the outlet pipe 6 to complete the closing action of the electromagnetic valve; under the state, the main elastic part 7 and the auxiliary elastic part 10 are matched to provide radial supporting force and axial pretightening force of the valve rod, so that the dislocation problem that the indentations are not coincident when the sealing block and the arc sealing surface (valve seat) are sealed is avoided, and the valve is ensured to be in a high-reliability sealing state.

S3: in the working state, the coil of the electromagnet assembly 2 is electrified, and the suspension armature performs suspension motion under the action of the electromagnetic force generated by the electromagnet assembly 2; the friction loss generated by the movement of parts when the valve core is opened and closed is reduced, thereby achieving the purpose of prolonging the service life. The valve rod 3 overcomes the pretightening force of the main elastic piece 7 and the auxiliary elastic piece 10 under the action of the armature iron 4 and moves to the opening position, and the valve core component 5 is separated from the sealing surface of the outlet pipe 6 to complete the opening action of the electromagnetic valve.

The product life is tested according to the method, and the result proves that the service life of the electromagnetic valve with the double-suspension structure can reach 100 ten thousand times, the product life is prolonged on the basis of ensuring the sealing performance of the product, and the development requirement is met.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims

1. The utility model provides a two suspended structure solenoid valves which characterized in that: the electromagnetic valve comprises an electromagnet assembly (2) and a valve core assembly (5), wherein an inlet pipe (1) and an outlet pipe (6) are respectively arranged at two ends of the electromagnet assembly (2), a valve rod (3) is arranged in the electromagnet assembly (2), one end, corresponding to the inlet pipe (1), of the valve rod (3) is connected with the electromagnet assembly (2) through an auxiliary elastic piece (10), one end, corresponding to the outlet pipe (6), of the valve rod (3) is connected with the electromagnet assembly (2) through a main elastic piece (7), the valve rod (3) is connected with the electromagnet assembly (2) through the auxiliary elastic piece (10) and the main elastic piece (7) to form a double-suspension supporting structure, an armature (4) is arranged on the valve rod (3) in an interference fit mode, and the valve core assembly (5) is arranged at the outer end portion of the armature (4) and is in contact fit with the outlet pipe (6).

2. A dual suspension structure solenoid valve as claimed in claim 1 wherein: the auxiliary elastic part (10) and the main elastic part (7) are both diaphragm springs; the valve rod (3) is made of titanium alloy material.

3. The dual suspension structure solenoid valve as claimed in claim 1 or 2, wherein: electromagnet assembly (2) includes coil skeleton (21) and coil (22), and coil (22) winding is equipped with through-hole (23) that supply valve rod (3) to pass through in coil skeleton (21) at the middle part of coil skeleton (21).

4. A dual suspension structure solenoid valve as claimed in claim 3 wherein: the coil framework (21) is connected with the inlet pipe (1) in a sealing mode to form a left floating cavity (12), and the coil framework (21) is connected with the outlet pipe (6) in a sealing mode to form a right floating cavity (13); the auxiliary elastic piece (10) is positioned in the left floating cavity (12), a filter (11) is arranged between the valve rod (3) and the inlet pipe (1), and the filter (11) is positioned in the left floating cavity (12); the main elastic piece (7) and the valve core assembly (5) are positioned in the right floating cavity (13).

5. The dual suspension structure solenoid valve as claimed in claim 4, wherein: the middle part of the auxiliary elastic part (10) is connected to the end part of the valve rod (3) through an inner hexagon screw (9), and the outer edge part of the auxiliary elastic part (10) is clamped between the coil framework (21) and the inlet pipe (1); the middle part of the main elastic part (7) is clamped between the valve core assembly (5) and the armature (4), the outer edge part of the main elastic part (7) is clamped between the coil framework (21) and the outlet pipe (6), and gaskets (8) are arranged on two sides of the main elastic part (7); the inner hexagon screw (9) is made of titanium alloy materials.

6. The dual suspension structure solenoid valve as claimed in claim 4 or 5, wherein: the coil framework (21) comprises an inlet base body (21-1) and an outlet base body (21-2), the outlet base body (21-2) is connected with the inlet base body (21-1) through a middle magnetism isolating ring (21-3) lapped on the inlet base body (21-1), and the middle magnetism isolating ring (21-3) is fixedly connected with the inlet base body (21-1) in a sealing mode; the through hole (23) is formed in the end portion, close to the outlet base body (21-2), of the inlet base body (21-1), the inner diameter of the outlet base body (21-2) is equal to the inner diameter of the middle magnetism isolating ring (21-3) and is larger than the diameter of the through hole (23), the end portion, close to the outlet base body (21-2), of the inlet base body (21-1), the middle magnetism isolating ring (21-3) and the outlet base body (21-2) form an armature cavity, the armature (4) is located in the armature cavity, and a magnetism isolating gasket (14) is arranged between the armature and the end portion, close to the outlet base body (21-2), of the inlet base body (21-1); a gap is reserved between the armature (4) and the inner annular surface of the armature cavity.

7. A dual suspension structure solenoid valve as claimed in claim 6 wherein: the coil framework (21) is coaxially arranged with the inlet pipe (1) and the outlet pipe (6); a reducing channel is arranged in the inlet pipe (1), and an inlet section channel and an outlet section channel of the reducing channel are both conical channels; the outlet pipe (6) is internally provided with a gradual change channel, and the diameter of the gradual change channel is increased in a sectional mode along the medium flowing direction.

8. The dual suspension structure solenoid valve as claimed in claim 1, 2, 4, 5 or 7, wherein: the valve core assembly (5) comprises a valve core base body (51) fixed on the valve rod (3), a sealing block (52) is arranged in the valve core base body (51), the sealing block (52) is fixed on the valve core base body (51) through a pressing block (53), and a rubber block (54) is arranged between the sealing block (52) and the valve core base body (51); the valve core base body (51) is a base body made of titanium alloy material.

9. The dual suspension structure solenoid valve as claimed in claim 8, wherein: and the air inlet of the outlet pipe (6) is provided with an arc sealing surface (61), and when the arc sealing surface (61) is in surface-to-surface contact fit with the sealing block (52), the liquid inlet of the outlet pipe (6) is closed.

10. A working method of the double suspension structure electromagnetic valve according to any one of claims 1 to 9, characterized in that: the method comprises the following steps: s1: two ends of the valve rod (3) are supported by the main elastic part (7) and the auxiliary elastic part (10) to form a double-suspension supporting structure; the armature (4) positioned on the valve rod (3) forms a suspension armature;

s2: under a normal state, the coil of the electromagnet assembly (2) is powered off, the valve rod (3) is in a closed position under the action of the pretightening force of the main elastic piece (7) and the auxiliary elastic piece (10), and the valve core assembly (5) is tightly pressed on the sealing surface of the outlet pipe (6) to complete the closing action of the electromagnetic valve;

s3: in a working state, a coil of the electromagnet assembly (2) is electrified, the suspension armature performs suspension motion under the action of electromagnetic force generated by the electromagnet assembly (2), the valve rod (3) overcomes the pre-tightening force of the main elastic piece (7) and the auxiliary elastic piece (10) under the action of the armature (4) and moves to an opening position, and the valve core assembly (5) is separated from the sealing surface of the outlet pipe (6) to complete the opening action of the electromagnetic valve;