CN116255496A

CN116255496A - Four-position three-way electromagnetic valve

Info

Publication number: CN116255496A
Application number: CN202211309798.9A
Authority: CN
Inventors: 中野有香
Original assignee: Takasago Electric Suzhou Co Ltd
Current assignee: Takasago Electric Suzhou Co Ltd
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2023-06-13

Abstract

The invention discloses a four-position three-way electromagnetic valve, which comprises a valve seat, wherein an inlet and two outlets are arranged on the valve seat; the driving assembly comprises an electromagnetic driving part and an elastic driving part, wherein the electromagnetic driving part comprises an upper electromagnetic driving part and a lower electromagnetic driving part which independently operate, and the driving directions of the upper electromagnetic driving part and the lower electromagnetic driving part are opposite; the opening and closing assembly comprises a rocker arm and a direct-acting valve, the middle part of the rocker arm is pivoted with the upper electromagnetic driving part through a shaft rod, one end of the rocker arm can open and close one outlet under the action of the lower electromagnetic driving part, and the other end of the rocker arm can open and close the other outlet under the action of the elastic driving part; the direct-acting valve is fixedly connected to the middle part of the rocker arm and can open and close the inlet under the action of the upper electromagnetic driving piece; when the two electromagnetic driving parts are operated, the elastic driving part is in a compressed state, and the inlet and the two outlets are in an open state. The four-position three-way electromagnetic valve has more compact structure while ensuring the four-position three-way function.

Description

Four-position three-way electromagnetic valve

Technical Field

The invention relates to the technical field of valves, in particular to a four-position three-way electromagnetic valve.

Background

Solenoid valves are automated basic components for electromagnetically controlling fluids, and are commonly used in industrial control systems to regulate the direction, flow, velocity, or other parameters of the fluid. In general, a three-way solenoid valve includes one inlet and two outlets, but the existing three-way solenoid valve is generally a two-position valve, and fluid entering through the inlet can only flow out through one of the two outlets, i.e., when the inlet is communicated with one outlet, the other outlet is in a closed state. When two outlets are required to be closed or opened simultaneously, two-position two-way valves are required to be combined to realize the function of a four-position three-way valve, but the mode is complicated to assemble, and the whole installation volume of the valve is larger.

Disclosure of Invention

In order to overcome the defects, the invention aims to provide the four-position three-way electromagnetic valve, which ensures the function of the four-position three-way valve and has more compact structure.

In order to achieve the above purpose, the invention adopts the following technical scheme: a four-position three-way electromagnetic valve, comprising

The valve seat is provided with an inlet and two outlets, and the two outlets are positioned on two sides of the inlet;

the driving assembly comprises an electromagnetic driving part and an elastic driving part which are matched for use, wherein the electromagnetic driving part comprises an upper electromagnetic driving part and a lower electromagnetic driving part which independently operate, and the driving directions of the upper electromagnetic driving part and the lower electromagnetic driving part are opposite;

the opening and closing assembly comprises a rocker arm and a direct-acting valve, the middle part of the rocker arm is pivoted with the upper electromagnetic driving part through a shaft rod, one end of the rocker arm can open and close one outlet under the action of the lower electromagnetic driving part, and the other end of the rocker arm can open and close the other outlet under the action of the elastic driving part; the direct-acting valve is fixedly connected to the middle part of the rocker arm and can open and close the inlet under the action of the upper electromagnetic driving piece;

when the two electromagnetic driving parts are operated, the elastic driving part is in a compressed state, and the inlet and the two outlets are in an open state.

The invention has the beneficial effects that:

the middle part of the rocker arm is pivoted on the upper electromagnetic driving part through the shaft rod, so that the upper electromagnetic driving part can drive the rocker arm and the direct-acting valve positioned in the middle part of the rocker arm to directly act (move up and down) to realize opening and closing of the inlet; the two ends of the rocker arm swing under the action of the lower electromagnetic driving piece and the elastic driving part respectively so as to realize the opening and closing of the two outlets; the direct-acting valve is integrated on the rocker arm, and the four-position three-way function is realized through the cooperation of the upper electromagnetic driving piece, the lower electromagnetic driving piece and the elastic driving part: when the two electromagnetic driving parts operate, the driving force of the two electromagnetic driving parts and the force of the elastic driving part can be mutually offset, so that the rocker arm is in a relatively balanced state, and at the moment, the inlet and the two outlets are in an open state; when the two electromagnetic driving pieces do not operate, the rocker arm only receives the force of the elastic driving part, at the moment, one end of the rocker arm, which is in contact with the elastic driving part, swings downwards under the action of the elastic driving part to close the corresponding outlet, and the other outlet and the opening are in an opening state; when only the lower electromagnetic driving piece operates, one end of the rocker arm, which is abutted against the lower electromagnetic driving piece, swings downwards under the action of the lower electromagnetic driving piece to close the corresponding outlet, and the other outlet and the opening are in an opening state; when the upper electromagnetic driving piece only operates, the shaft rod can drive the rocker arm and the direct-acting valve to synchronously move upwards, so that the direct-acting valve upwards closes the inlet.

The direct acting valve is integrated on the rocker arm, and the four-position three-way function is realized through the cooperation driving of the upper electromagnetic driving piece, the lower electromagnetic driving piece and the elastic driving part, so that the complicated operation of assembling two-way valves is effectively avoided, the whole structure is more compact, and the installation space can be saved.

Further, the electromagnetic driving part comprises a shell fixedly connected to the valve seat, an upper electromagnetic driving part and a lower electromagnetic driving part which are symmetrically arranged along the vertical direction are arranged in the shell, the upper electromagnetic driving part and the lower electromagnetic driving part comprise electromagnetic coils, fixed iron cores, movable iron cores and reset springs, and the movable iron cores can move towards the direction close to the fixed iron cores under the action of the electromagnetic coils; when both electromagnetic coils are electrified, the two movable iron cores move in the directions away from each other.

When the electromagnetic coils of the upper electromagnetic driving piece and the lower electromagnetic driving piece are electrified, the two movable iron cores can move in the directions far away from each other, namely the movable iron cores of the upper electromagnetic driving piece move upwards, an upward driving force is applied to the rocker arm through the shaft rod, the movable iron cores of the lower electromagnetic driving piece move downwards, a downward driving force is applied to one end of the rocker arm, a downward resilience force is applied to the other end of the rocker arm by the spring driving part, at the moment, the rocker arm keeps balance under the action of the upper electromagnetic driving piece, the lower electromagnetic driving piece and the spring driving part, the two outlets are in an opening state, the direct acting valve stays at a position enabling the inlet to be in the opening state, and the rocker arm is assumed to be in a first height at the moment;

it should be noted that when the electromagnetic coil of the upper electromagnetic driving member or the lower electromagnetic driving member is energized, both the two movable iron cores can receive the electromagnetic driving force of the same electromagnetic coil, but the two movable iron cores are driven by the same electromagnetic coil in different magnitudes due to the distance between the two movable iron cores and the electromagnetic coil, i.e. the electromagnetic driving force of the electromagnetic coil of the upper electromagnetic driving member on the movable iron core of the upper electromagnetic driving member is greater than the electromagnetic driving force of the electromagnetic coil of the upper electromagnetic driving member on the movable iron core of the lower electromagnetic driving member; the electromagnetic driving force of the electromagnetic coil of the lower electromagnetic driving piece to the movable iron core of the lower electromagnetic driving piece is larger than that of the electromagnetic coil of the lower electromagnetic driving piece to the movable iron core of the upper electromagnetic driving piece.

When the electromagnetic coil of the upper electromagnetic driving piece is electrified, the two movable iron cores are both subjected to upward driving force, and at the moment, the upward driving force applied to the rocker arm is larger than the downward resilience force applied by the spring driving part, so that the rocker arm can move upwards to the upper side of the first height, and the direct-acting valve can move to a position where the inlet is in a closed state.

When the electromagnetic coil of the lower electromagnetic driving piece is electrified, the two movable iron cores are subjected to downward driving force, at the moment, the rocker arm can move downwards to the position below the first height, and the direct-acting valve moves downwards to the position for enabling the inlet to be in an open state; and because the driving force received by the movable iron core of the lower electromagnetic driving piece is greater than the driving force received by the movable iron core of the upper electromagnetic driving piece, at the moment, one end of the rocker arm connected with the lower electromagnetic driving piece can swing downwards so as to enable the corresponding outlet to be in a closed state, and the other end of the rocker arm swings upwards so as to enable the other outlet to be in an open state.

When the electromagnetic coils of the upper electromagnetic driving piece and the lower electromagnetic driving piece are not electrified, the rocker arm only receives the resilience force of the spring driving part, at the moment, one end of the rocker arm connected with the spring driving part can swing downwards so as to enable the corresponding outlet to be in a closed state, and the other end of the rocker arm swings upwards so as to enable the other outlet to be in an open state.

Further, the return spring is arranged between the fixed iron core and the movable iron core, and when the electromagnetic coil is powered off, the return spring can be in a natural state so as to reset the movable iron core.

Further, the shaft rod is arranged in the lower electromagnetic driving part in a penetrating way, the upper end of the shaft rod is connected with the movable iron core of the upper electromagnetic driving part, and the lower end of the shaft rod is pivoted with the rocker arm. The shaft rod is arranged on the lower electromagnetic driving part in a penetrating mode, the installation space of the shaft rod can be saved, the compactness of the whole structure is further facilitated, the movement of the movable iron core of the upper electromagnetic driving part can be transmitted to the rocker arm through the shaft rod, and the swing center of the rocker arm is limited.

Further, the movable iron core of the lower electromagnetic driving piece is abutted on the rocker arm through the push rod so as to conveniently drive the rocker arm to swing.

Further, the elastic driving part is positioned in the valve seat and comprises a driving spring and a tray, the tray is abutted on the rocker arm, the driving spring is arranged at the upper end of the tray, the driving spring is distributed along the vertical direction, and two ends of the driving spring are respectively abutted on the shell and the tray.

Further, the rocker arm comprises a rocker arm body, a connecting arm is arranged in the middle of the upper end of the rocker arm body, and the connecting arm is pivoted with the shaft lever through a pin shaft.

Furthermore, the lower end surface of the rocker arm body is covered with a diaphragm, two ends of the diaphragm are fixedly embedded in the valve seat, and when the rocker arm body swings, any outlet can be blocked by the diaphragm. The sealing performance of the outlet can be improved through the arrangement of the diaphragm.

Further, the upper end of the rocker arm body is also provided with an abutting convex part for abutting the elastic driving part and the lower electromagnetic driving part respectively, and the abutting convex part is in a circular arc structure. When the abutting convex part is arranged to be in a circular arc structure to enable the rocker arm body to swing, the abutting convex part and the elastic driving part or the lower electromagnetic driving part can form cambered surface abutting connection, so that rigid friction damage is reduced.

Further, the valve seat comprises an upper valve seat and a lower valve seat which are fixedly connected, an inlet and an outlet are arranged in the lower valve seat, and a valve cavity communicated with the inlet and the outlet is arranged in the upper valve seat; the rocker arm, the outlet sealing piece and the elastic driving part are all positioned in the valve cavity.

Drawings

FIG. 1 is a schematic diagram of a four-position three-way valve according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a four-position three-way valve according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a four-position three-way valve according to an embodiment of the present invention when one outlet is closed;

fig. 4 is a schematic diagram of another outlet of the four-position three-way valve according to the embodiment of the present invention.

In the figure:

1-valve seat; 11-inlet; 12-outlet; 13-upper valve body; 14-a lower valve body;

21-a rocker arm; 211-a connecting arm; 212-abutment projections; 213-a membrane; 22-direct-acting valve; 221-valve stem; 222-inlet block piece; 23-a shaft lever;

31-a housing; 32-electromagnetic coils; 33-fixing the iron core; 34-a movable iron core; 35-a return spring; 36-toroidal core; 37-dividing plate; 38-pushing rod;

41-a drive spring; 42-tray.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.

Examples

Referring to fig. 1-4, the four-position three-way electromagnetic valve comprises a valve seat 1, a driving assembly and an opening and closing assembly, wherein an inlet 11 and two outlets 12 are arranged on the valve seat 1, and the two outlets 12 are positioned on two sides of the inlet 11. The driving assembly comprises an electromagnetic driving part and an elastic driving part which are matched for use, wherein the electromagnetic driving part comprises an upper electromagnetic driving part and a lower electromagnetic driving part which independently operate, and the driving directions of the upper electromagnetic driving part and the lower electromagnetic driving part are opposite. The opening and closing assembly comprises a rocker arm 21 and a direct-acting valve 22, wherein the middle part of the rocker arm 21 is pivoted with an upper electromagnetic driving piece through a shaft rod 23, one end of the rocker arm can open and close one outlet 12 under the action of the lower electromagnetic driving piece, and the other end of the rocker arm can open and close the other outlet 12 under the action of an elastic driving part; the direct-acting valve 22 is fixedly connected to the middle part of the rocker arm 21, and can open and close the inlet 11 under the action of an upper electromagnetic driving piece. When both electromagnetic driving parts are operated, the elastic driving part is in a compressed state, and the inlet 11 and the two outlets 12 are in an opened state.

The direct-acting valve 22 is integrated on the rocker arm 21, and the four-position three-way function is realized through the cooperation driving of the upper electromagnetic driving piece, the lower electromagnetic driving piece and the elastic driving part, so that the complicated operation of assembling two-way valves is effectively avoided, the whole structure is more compact, and the installation space can be saved.

Specifically, referring to fig. 1, the electromagnetic driving part includes a casing 31 fixedly connected to the valve seat 1, an upper electromagnetic driving part and a lower electromagnetic driving part which are symmetrically arranged along a vertical direction are arranged in the casing 31, the upper electromagnetic driving part and the lower electromagnetic driving part respectively include an electromagnetic coil 32, a fixed iron core 33, a movable iron core 34 and a return spring 35, wherein the fixed iron core 33 is fixedly connected in the casing 31, the electromagnetic coil 32 is wound on the outer side of the movable iron core 34 and can drive the movable iron core 34 to move towards a direction close to the fixed iron core 33, and the return spring 35 is arranged between the fixed iron core 33 and the movable iron core 34; when the electromagnetic coil 32 is electrified, the movable iron core 34 can move towards the direction approaching the fixed iron core 33, the return spring 35 is in a compressed state, and when the electromagnetic coil 32 is deenergized, the movable iron core 34 is reset under the action of the return spring 35. In the present embodiment, the electromagnetic coil 32 of the upper electromagnetic driving member applies an upward driving force to the movable iron core 34, and the electromagnetic coil 32 of the lower electromagnetic driving member applies a downward driving force to the movable iron core 34, so that when both the electromagnetic coils 32 are energized, both the movable iron cores 34 move in directions away from each other.

It should be noted that, when the electromagnetic coil 32 of the upper electromagnetic driving member or the lower electromagnetic driving member is energized, both the two movable iron cores 34 can receive the electromagnetic driving force of the same electromagnetic coil 32, but the two movable iron cores 34 are driven by the same electromagnetic coil 32 in different magnitudes due to the distance from the electromagnetic coil 32, i.e., the electromagnetic driving force of the electromagnetic coil 32 of the upper electromagnetic driving member to the movable iron core 34 of the upper electromagnetic driving member is greater than the electromagnetic driving force of the electromagnetic coil 32 to the movable iron core 34 of the lower electromagnetic driving member; the electromagnetic driving force of the electromagnetic coil 32 of the lower electromagnetic driving member to the movable iron core 34 of the lower electromagnetic driving member is greater than the electromagnetic driving force of the electromagnetic coil to the movable iron core 34 of the upper electromagnetic driving member.

Referring to fig. 1, when the electromagnetic coils 32 of the upper and lower electromagnetic driving members are energized, the two movable iron cores 34 can move in the directions away from each other, that is, the movable iron core 34 of the upper electromagnetic driving member moves upward and applies upward driving force to the rocker arm 21 through the shaft rod 23, the movable iron core 34 of the lower electromagnetic driving member moves downward and applies downward driving force to one end of the rocker arm 21, and the spring driving portion applies downward resilience force to the other end of the rocker arm 21, at this time, the rocker arm 21 is kept balanced under the action of the upper electromagnetic driving member, the lower electromagnetic driving member and the spring driving portion, both outlets 12 are in an opened state, and the direct acting valve 22 stays at a position where the inlet 11 is in an opened state, assuming that the rocker arm 21 is at the first height;

referring to fig. 2, when only the solenoid 32 of the upper electromagnetic driving member is energized, both movable cores 34 are subjected to an upward driving force, and at this time, since the upward driving force received on the rocker arm 21 is greater than the downward repulsive force applied by the spring driving portion, the rocker arm 21 can be moved upward above the first height so that the direct-acting valve 22 can be moved to a position where the inlet 11 is in a closed state.

Referring to fig. 3, when only the solenoid 32 of the lower solenoid driver is energized, both movable cores 34 are subjected to a downward driving force, and at this time, the rocker arm 21 can be moved downward below the first level, and the direct-acting valve 22 is moved downward to a position where the inlet 11 is in an open state; because the driving force received by the movable iron core 34 of the lower electromagnetic driving member is greater than the driving force received by the movable iron core 34 of the upper electromagnetic driving member, at this time, one end of the rocker arm 21 connected with the lower electromagnetic driving member can swing downward, so that the corresponding outlet 12 is in a closed state, and the other end swings upward, so that the other outlet 12 is in an open state.

Referring to fig. 4, when the electromagnetic coils 32 of the upper and lower electromagnetic driving members are not energized, the rocker arm 21 receives only the resilience force of the spring driving portion, and at this time, the inlet 11 is in an opened state, one end of the rocker arm 21 connected to the spring driving portion can swing downward to place the corresponding outlet 12 in a closed state, and the other end swings upward to place the other outlet 12 in an opened state.

It should be noted that the force exerted by the elastic driving portion on the rocker arm 21 should be smaller than the force exerted by any one of the electromagnetic driving members on the rocker arm 21. So that any electromagnetic driving member can overcome the driving of the rocker arm 21 by the elastic driving portion when operating.

In an embodiment, the side of the movable iron core 34 away from the fixed iron core 33 is further wound with an annular iron core 36, and the annular iron core 36 is fixedly connected in the housing 31 for guiding the movement of the movable iron core 34.

In one embodiment, a partition plate 37 is further disposed in the housing 31, and the partition plate 37 is located between the two movable cores 34 to limit the movement range of the movable cores 34.

In an embodiment, two movable iron cores 34 and a partition plate 37 are jointly provided with a through hole for the shaft rod 23 to pass through, the shaft rod 23 is arranged in the through hole in a penetrating way, the upper end of the shaft rod 23 is connected with the movable iron core 34 of the upper electromagnetic driving piece, and the lower end of the shaft rod 23 is pivoted with the middle part of the rocker arm 21. The shaft 23 is limited by the perforations so that the shaft 23 can only move up and down along the perforations.

In an embodiment, the valve seat 1 comprises an upper valve body 13 and a lower valve body 14 which are fixedly connected, one inlet 11 and two outlets 12 are formed in the lower valve body 14, and a valve cavity communicated with all the inlets 11 and the outlets 12 is formed in the upper valve body 13.

In one embodiment, the rocker arm 21 is located in the valve cavity, and includes a rocker arm body, a connecting arm 211 capable of moving along the through hole is integrally provided in the middle of the upper end of the rocker arm body, and the connecting arm 211 is pivotally connected to the shaft 23 through a pin. The upper end of the rocker arm body is also respectively provided with an abutting convex part 212 for abutting the elastic driving part and the lower electromagnetic driving part, and the abutting convex part 212 is in a circular arc structure. The lower end surface of the rocker arm body is covered with a diaphragm 213, two ends of the diaphragm 213 are fixedly embedded between the upper valve body 13 and the lower valve body 14, and when the rocker arm body swings, any outlet 12 can be blocked by the diaphragm 213. The sealing performance of the outlet 12 can be improved through the arrangement of the diaphragm 213, and when the abutting convex part 212 is arranged into a circular arc structure, the abutting convex part 212 can form cambered surface abutting with the elastic driving part or the lower electromagnetic driving part when the rocker arm body swings, so that rigid friction damage is reduced.

In an embodiment, the movable core 34 of the lower electromagnetic driving member is further connected to a push rod 38 extending into the valve cavity, and the push rod 38 abuts against one abutment protrusion 212 of the rocker arm 21. When the movable iron core 34 moves downward, the push rod 38 can apply a force to the abutment boss 212 to swing the rocker arm 21.

In an embodiment, referring to fig. 4, the elastic driving part is located in the valve cavity and comprises a driving spring 41 and a tray 42, wherein the tray 42 is abutted against the other abutting convex part 212 of the rocker arm 21, the driving spring 41 is arranged at the upper end of the tray 42, and the driving spring 41 is distributed along the vertical direction, and two ends of the driving spring 41 are respectively abutted against the shell 31 and the tray 42.

In one embodiment, referring to fig. 2, the direct acting valve 22 includes a valve stem 221 fixedly coupled to the rocker arm 21, the valve stem 221 being disposed through the inlet 11 and having an inlet blocking member 222 coupled thereto to enhance the sealing effect against the inlet 11.

The working procedure of this embodiment is as follows:

referring to fig. 1, when two electromagnetic coils 32 are energized, two movable iron cores 34 move back to drive a shaft rod 23 and a push rod 38 to move back, at this time, the rocker arm 21 is simultaneously subjected to forces of two electromagnetic driving parts and an elastic driving part (the middle part of the rocker arm 21 is subjected to upward force of the shaft rod 23, one end is subjected to downward force of the push rod 38, and the other end is subjected to force of the elastic driving part), until the upward force and the downward force applied to the rocker arm 21 are mutually offset, the rocker arm 21 is in a balanced state in a valve cavity, at this time, the inlet 11 and the two outlets 12 are both in an open state, and the rocker arm 21 is in a first height;

referring to fig. 2, when the electromagnetic coil 32 of the upper electromagnetic driving member is energized and the electromagnetic coil 32 of the lower electromagnetic driving member is not energized, the two movable iron cores 34 move upward simultaneously and drive the shaft rod 23 and the push rod 38 to move upward; at this time, the rocker arm 21 moves upwards under the driving of the shaft lever 23 (because the upward force received on the shaft lever 23 is greater than the upward force received by the push rod 38, when the rocker arm 21 moves upwards under the driving of the shaft lever 23, one end of the rocker arm 21 can always abut against the push rod 38), the direct-acting valve 22 moves upwards along with the rocker arm until the inlet sealing piece 222 seals the inlet 11, the direct-acting valve 22 abuts against the valve seat 1, at this time, the inlet 11 is in a closed state, the two outlets 12 are in an open state, the rocker arm 21 can be located above the first height, and the direct-acting valve 22 is in the highest moving position;

referring to fig. 3, when the electromagnetic coil 32 of the lower electromagnetic driving member is energized and the electromagnetic coil 32 of the upper electromagnetic driving member is not energized, the two movable iron cores 34 simultaneously move downward and drive the shaft rod 23 and the push rod 38 to move downward, at this time, the rocker arm 21 moves downward, and since the downward force applied to the push rod 38 is greater than the downward force applied to the shaft rod 23, the end of the rocker arm 21 abutting against the push rod 38 can swing downward, so that the diaphragm 213 can block the corresponding outlet 12, the other outlet 12 is in an open state, and at this time, the rocker arm 21 is located below the first height, and the direct-acting valve 22 is in the lowest position of movement, so as to ensure that the inlet 11 is in an open state.

Referring to fig. 4, when both the electromagnetic coils 32 are not energized, only the downward force applied by the elastic driving portion is applied to the rocker arm 21, and at this time, the end of the rocker arm 21 abutting against the tray 42 can swing downward, so that the diaphragm 213 can block the corresponding outlet 12, and the other outlet 12 is in an open state, and at this time, the inlet 11 is also in an open state.

The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.

Claims

1. A four-position three-way electromagnetic valve, which is characterized in that: comprising

2. The four-position three-way solenoid valve according to claim 1, wherein: the electromagnetic driving part comprises a shell fixedly connected to the valve seat, the shell is internally provided with an upper electromagnetic driving part and a lower electromagnetic driving part which are symmetrically arranged along the vertical direction, the upper electromagnetic driving part and the lower electromagnetic driving part respectively comprise an electromagnetic coil, a fixed iron core, a movable iron core and a reset spring, and the movable iron core can move towards the direction close to the fixed iron core under the action of the electromagnetic coil; when both the electromagnetic coils are electrified, the two movable iron cores move in the directions away from each other.

3. The four-position three-way solenoid valve according to claim 2, wherein: the return spring is arranged between the fixed iron core and the movable iron core, and can be in a natural state when the electromagnetic coil is powered off.

4. The four-position three-way solenoid valve according to claim 2, wherein: the shaft rod is arranged in the lower electromagnetic driving piece in a penetrating way, the upper end of the shaft rod is connected with the movable iron core of the upper electromagnetic driving piece, and the lower end of the shaft rod is pivoted with the rocker arm.

5. The four-position three-way solenoid valve according to claim 2, wherein: the movable iron core positioned on the lower electromagnetic driving piece is abutted on the rocker arm through the push rod.

6. The four-position three-way solenoid valve according to claim 2, wherein: the elastic driving part is positioned in the valve seat and comprises a driving spring and a tray, the tray is abutted on the rocker arm, the driving spring is arranged at the upper end of the tray, the driving spring is distributed along the vertical direction, and two ends of the driving spring are respectively abutted on the shell and the tray.

7. The four-position three-way solenoid valve according to claim 1, wherein: the rocker arm comprises a rocker arm body, a connecting arm is arranged in the middle of the upper end of the rocker arm body, and the connecting arm is pivoted with the shaft lever through a pin shaft.

8. The four-position three-way solenoid valve according to claim 7, wherein: the lower end face of the rocker arm body is covered with a diaphragm, two ends of the diaphragm are fixedly embedded in the valve seat, and when the rocker arm body swings, any outlet can be blocked by the diaphragm.

9. The four-position three-way solenoid valve according to claim 7, wherein: the upper end of the rocker arm body is also respectively provided with an abutting convex part for abutting the elastic driving part and the lower electromagnetic driving part, and the abutting convex part is in a circular arc structure.

10. The four-position three-way solenoid valve according to claim 1, wherein: the valve seat comprises an upper valve seat and a lower valve seat which are fixedly connected, the lower valve seat is internally provided with the inlet and the outlet, and the upper valve seat is internally provided with a valve cavity communicated with the inlet and the outlet; the rocker arm, the outlet sealing piece and the elastic driving part are all positioned in the valve cavity.