Magnetic latching solenoid valve

Abstract

The invention relates to a magnetic latching electromagnetic valve and belongs to the field of electromagnetic valves, the magnetic latching electromagnetic valve comprises a winding spool and a coil arranged on the winding spool, the winding spool is provided with an inner cavity, a movable valve core is arranged in the inner cavity, one end of the winding spool is provided with an air vent A and an air vent B which are communicated with the inner cavity, and the other end of the winding spool is provided with a fixed valve core through a connecting part; a ventilation opening C communicated with the inner cavity is formed in the fixed valve element, the movable valve element slides between the ventilation opening B and the ventilation opening C so that the ventilation opening B or the ventilation opening C can be plugged, a permanent magnet is arranged on the ventilation opening C, located in the inner cavity, of the fixed valve element, and the movable valve element is made of magnetic conduction materials. Positive and negative pole direct current is supplied to the two ends of the coil through the winding shaft to generate a magnetic field, movement of the brake valve element and movement and keeping of the movable valve element between two positions in the inner cavity are controlled, after the movable iron core and the static iron core are attracted through the permanent magnetic force of the permanent magnet, when the electromagnetic valve coil is not powered on, the attraction state of the movable iron core and the static iron core can be kept, and the electromagnetic valve is stable in operation. The magnetic latching function is achieved, and power consumption of the electromagnetic valve is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic valves, in particular to a magnetic holding electromagnetic valve. Background Art

[0002] As an important fluid control device, solenoid valves are widely used in various fields of industry and life. However, traditional solenoid valves have some obvious shortcomings in their working process. Traditional solenoid valves usually require continuous power supply to keep the valve open or closed, which leads to high energy consumption. With energy becoming increasingly tight today, reducing the power consumption of solenoid valves has become an urgent problem to be solved. Summary of the invention

[0003] In order to solve the problems in the related art, the present invention provides a magnetic holding solenoid valve, which solves the problem of high power consumption.

[0004] In order to solve the above problems, the following technical solutions are provided: The magnetic holding solenoid valve of the present invention comprises a winding bobbin and a coil arranged on the winding bobbin, the winding bobbin has an inner cavity, a moving valve core is arranged in the inner cavity, one end of the winding bobbin is provided with an air vent A and an air vent B connected to the inner cavity, the other end of the winding bobbin is installed with a fixed valve core through a connecting portion, the fixed valve core is provided with an air vent C connected to the inner cavity, the moving valve core slides between the air vent B and the air vent C to seal the air vent B and the air vent C, a permanent magnet is arranged on the air vent C located in the inner cavity of the fixed valve core, and the moving valve core and the fixed valve core are both made of magnetic conductive materials.

[0005] The coil of the above scheme is energized to generate a magnetic field, which controls the movement of the moving valve core and realizes the on-off control of the vent B and the vent C. The magnetic field is generated by passing direct current through the coil to control the movement of the moving valve core. The moving valve core moves and remains between two positions in the inner cavity, thereby realizing the blocking of the vent B and the vent C, thereby controlling the connection and disconnection between the vents. The permanent magnetic force of the permanent magnet allows the moving iron core and the static iron core to maintain the attracted state of the moving iron core and the static iron core even when the solenoid valve coil is not energized after they are attracted, thereby realizing the magnetic holding function and reducing the power consumption of the solenoid valve.

[0006] A return spring is arranged between the movable valve core and the fixed valve core, and both ends of the return spring are respectively abutted against one end of the movable valve core and the fixed valve core that are close to each other. A first limiting groove for sleeve installation of the return spring is provided on the movable valve core, and a second limiting groove for sleeve installation of the return spring is provided on the fixed valve core.

[0007] The reset spring of the above scheme can, when the coil is energized in the reverse direction to offset the permanent magnetic force of the permanent magnet on the moving valve core, enable the moving valve core to return to its initial position, and always remain in the initial position after power is cut off, blocking the air vent B. External gas cannot enter the inner cavity through the air vent B to ensure the normal operation of the solenoid valve. The first limit groove and the second limit groove are provided to fix the reset spring to prevent it from shifting, thereby improving the stability of the spring. The reset spring can also play a guiding role for the moving valve core.

[0008] The vent A is arranged at the edge of the inner cavity and the vent A partially overlaps with the inner cavity in the XY projection plane. The side of the movable valve core is provided with a clearance surface parallel to the Z axis, and at least one clearance surface is arranged close to the vent A.

[0009] The above solution sets a yield surface on the moving valve core, so that when exhausting, the resistance to the fluid between the vent A and the vent C is reduced, thereby improving the exhaust efficiency.

[0010] A first sealing gasket and a second sealing gasket are respectively disposed at both ends of the moving valve core. The first sealing gasket is used for sealing contact with the vent B, and the second sealing gasket is used for sealing contact with the vent C.

[0011] The above solution adopts the first sealing gasket, and the second sealing gasket provides buffering for the movement of the moving valve core, greatly reducing the collision noise generated by the movement of the moving valve core, and ensuring the silent effect during the use of the solenoid valve.

[0012] One end of the vent B protrudes inwards and the opening of the inner end of the vent B is a flat opening.

[0013] The vent B of the above solution adopts an inwardly protruding design to increase the stability of the connection between the vent B and the moving valve core, and the opening is designed to be a flat opening to better seal with the first sealing gasket of the moving valve core, reducing the risk of leakage.

[0014] The connecting portion includes a connecting port opened at one end of the winding spool, the cross-section of the fixed valve core is a T-shaped structure, the fixed valve core includes a valve core body and a limiting edge, the valve core body is slidingly sealed and inserted in the connecting port, and the limiting edge is left outside the connecting port.

[0015] The fixed valve core of the above scheme adopts a T-shaped structure, so as to achieve a stable connection between the fixed valve core and the connecting port. A limiting edge is provided at one end of the valve core body to prevent the valve core body from being excessively inserted into the connecting port, thereby ensuring the accuracy of the installation position.

[0016] At least one annular groove is formed on the circumferential surface of the valve core body, and a sealing ring is disposed in the annular groove.

[0017] The above scheme sets an annular groove on the valve core body, and sets a sealing ring in the annular groove to achieve sliding sealing contact between the fixed valve core and the connecting port, thereby improving the sealing between the fixed valve core and the connecting port, preventing fluid leakage, and ensuring the working reliability of the solenoid valve.

[0018] The winding bobbin is a bobbin, both terminals of the bobbin are connected with PIN needles, a magnetic yoke is installed on the bobbin, one end of the magnetic yoke is connected with the outer end of the fixed valve core, and the fixed valve core is a magnetic conductive material.

[0019] The bobbin of the above scheme can be used as a winding bobbin to conveniently wind the coil, the PIN needle facilitates the connection of the coil to an external power supply, the setting of the magnetic yoke can enhance the strength of the magnetic field and improve the control effect of the solenoid valve, and the valve core is made of magnetic conductive material to better interact with the magnetic field generated by the permanent magnet and the coil.

[0020] A mounting hole is provided at the center of the permanent magnet, a third limiting groove is provided in an annular direction at one end of the fixed valve core located in the inner cavity, and a limiting column is reserved at the center of the third limiting groove so that the permanent magnet can be fixedly sleeved on the fixed valve core through the mounting hole.

[0021] The design of the mounting hole, the third limiting groove and the limiting column in the above solution can ensure that the permanent magnet is firmly mounted on the fixed valve core and will not loosen or shift during operation, thereby ensuring the stability of the magnetic holding function.

[0022] The two ends of the magnetic yoke are provided with a first clamping claw and a second clamping claw, the end of the bobbin away from the fixed valve core is provided with a first clamping groove engaged with the first clamping claw, and the limiting edge is provided with a second clamping groove engaged with the second clamping claw.

[0023] The above solution adopts the cooperation of the first claw and the first slot, the second claw and the second slot to realize the rapid installation and fixation of the yoke, improves the assembly efficiency of the solenoid valve, and ensures the stability of the yoke. The above solution has the following advantages: 1. The magnetic holding solenoid valve of the present scheme includes a winding bobbin and a coil arranged on the winding bobbin, the winding bobbin has an inner cavity, a moving valve core is arranged in the inner cavity, one end of the winding bobbin is provided with a vent A and a vent B connected to the inner cavity, the other end of the winding bobbin is installed with a fixed valve core through a connecting portion, a vent C connected to the inner cavity is arranged in the fixed valve core, the moving valve core slides between the vent B and the vent C to block the vent B or the vent C, a permanent magnet is arranged on the vent C located in the inner cavity of the fixed valve core, and the moving valve core and the fixed valve core are both made of magnetic conductive materials. The coil is energized to generate a magnetic field, which controls the movement of the moving valve core and realizes the on-off control of vent B and vent C. The winding bobbin passes positive and negative DC current to both ends of the coil to generate a magnetic field to control the movement of the moving valve core. The moving valve core moves and maintains between two positions in the inner cavity, thereby realizing the blocking of vent B and vent C, thereby controlling the connection and disconnection between the vents. The permanent magnetic force of the permanent magnet allows the moving iron core and the static iron core to maintain the attracted state of the moving iron core and the static iron core even when the solenoid valve coil is not energized after they are attracted, thereby realizing the magnetic holding function and reducing the power consumption of the solenoid valve.

[0024] 2. A reset spring is provided between the moving valve core and the fixed valve core, and the two ends of the reset spring are respectively against the ends of the moving valve core and the fixed valve core that are close to each other. The moving valve core is provided with a first limit groove for the reset spring, and the fixed valve core is provided with a second limit groove for the reset spring. The reset spring can return to the initial position when the coil is reversely energized to offset the permanent magnetic force of the permanent magnet on the moving valve core, and always remain in the initial position after power failure, blocking the vent B, so that external gas cannot enter the inner cavity through the vent B to ensure the normal operation of the solenoid valve. The first limit groove and the second limit groove can fix the reset spring to prevent it from deflecting, thereby improving the stability of the spring. The reset spring can also play a guiding role for the moving valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein: Figure 1 It is a structural schematic diagram of the magnetic holding solenoid valve of the present invention; Figure 2 It is a structural schematic diagram of the magnetic holding solenoid valve of the present invention from another perspective; Figure 3 is based on Figure 1 A cross-sectional view of Figure 4 It is a partial cross-sectional view of the valve body; Figure 5 It is a schematic diagram of the installation structure of the moving valve core and the permanent magnet; Figure 6 yes Figure 3 Enlarged view of part A.

[0026] Figure numerals: 1. valve body; 101. bobbin; 1011. inner cavity; 102. vent A; 103. vent B; 104. connection port; 2. coil; 3. moving valve core; 301. mounting groove; 302. first limit groove; 303. yield surface; 4. fixed valve core; 401. valve core body; 4011. annular groove; 4012. third limit groove; 402. limit edge; 403. vent C; 5. permanent magnet; 501. second limit groove; 6. sealing ring; 7. first sealing gasket; 8. second sealing gasket; 9. yoke; 901. first clamping claw; 902. second clamping claw; 10. PIN needle; 11. reset spring; 12. protrusion. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1 and 2 As shown, the magnetic holding solenoid valve of the first embodiment includes a winding bobbin, a coil 2, a moving valve core 3, a fixed valve core 4, a permanent magnet 5, a reset spring 11, a sealing gasket and a yoke 9. The winding bobbin is a bobbin 101, both terminals of the bobbin 101 are connected to PIN needles 10, a yoke 9 is installed on the bobbin 101, one end of the yoke 9 is connected to the outer end of the fixed valve core 4, wherein the fixed valve core 4 is a magnetic conductive material.

[0029] The bobbin 101 is an integral structure with the valve body 1 of the solenoid valve. The bobbin 101 has an inner cavity 1011. The moving valve core 3 is arranged in the inner cavity 1011. One end of the bobbin 101 is provided with a vent A 102 and a vent B 103 communicating with the inner cavity 1011. The other end of the bobbin 101 is installed with a fixed valve core 4 through a connecting portion. The vent A 102 and the vent B 103 can be regarded as being arranged on the valve body 1; furthermore, the fixed valve core 4 is provided with a vent C 403 communicating with the inner cavity 1011. The moving valve core 3 slides between the vent B 103 and the vent C 403 to block the vent B 103 or the vent C 403. The fixed valve core 4 is provided with a permanent magnet 5 on the vent C 403 located in the inner cavity 1011. The moving valve core 3 is made of magnetic conductive material. The coil 2 is energized to generate a magnetic field, which controls the movement of the moving valve core 3 and realizes the on-off control of the vent B103 and the vent C 403. The winding spool 101 passes positive and negative DC currents at both ends of the coil 2 to generate a magnetic field, which controls the movement of the moving valve core 3. The moving valve core 3 moves and remains between two positions in the inner cavity 1011, thereby realizing the blocking of the vent B103 or the vent C 403, thereby controlling the connection and disconnection between the vents. The permanent magnetic force of the permanent magnet allows the moving iron core and the static iron core to maintain the attracted state of the moving iron core and the static iron core even when the solenoid valve coil 2 is not energized after they are attracted, thereby realizing the magnetic holding function and reducing the power consumption of the solenoid valve.

[0030] like Figure 3 As shown, a return spring 11 is provided between the moving valve core 3 and the fixed valve core 4, and the two ends of the return spring 11 are respectively against the ends of the moving valve core 3 and the fixed valve core 4, and a first limiting groove 302 for the return spring 11 is provided on the moving valve core 3, and a second limiting groove 501 for the return spring 11 is provided on the fixed valve core 4. The return spring 11 can return to the initial position when the coil 2 is reversely energized to offset the permanent magnetic force of the permanent magnet on the moving valve core 3, and always remain in the initial position after power is cut off, blocking the vent B 103, and external gas cannot enter the inner cavity 1011 through the vent B 103, so as to ensure the normal operation of the solenoid valve. The first limiting groove 302 and the second limiting groove 501 can fix the return spring 11, prevent it from deflecting, and improve the stability of the spring. The return spring 11 can also play some guiding role for the moving valve core 3.

[0031] like Figure 4 As shown, the vent A 102 is disposed at the edge of the inner cavity 1011 and the vent A 102 partially overlaps with the inner cavity 1011 in the XY projection plane. Figure 5 As shown, both sides of the moving valve core 3 are provided with clearance surfaces 303 parallel to the Z axis, and the clearance surfaces 303 are flat surfaces, and one of the clearance surfaces 303 is arranged close to the vent A 102, so that when exhausting, the resistance of the fluid between the vent A 102 and the vent C 403 can be effectively reduced, thereby improving the exhaust efficiency.

[0032] As an example, the connection portion of this embodiment includes a connection port 104 opened at one end of the winding spool, the cross section of the fixed valve core 4 is a T-shaped structure, the fixed valve core 4 includes a valve core body 401 and a limiting edge 402, the valve core body 401 is inserted in the connection port 104 in a sliding seal, and the limiting edge 402 is left outside the connection port 104. The fixed valve core 4 adopts a T-shaped structure, thereby achieving a stable connection between the fixed valve core 4 and the connection port 104, and the limiting edge 402 is provided at one end of the valve core body 401 to prevent the valve core body 401 from being excessively inserted into the connection port 104, thereby ensuring the accuracy of the installation position.

[0033] For example Figure 3 As shown, at least one annular groove 4011 is provided on the circumferential surface of the valve core body 401. In this embodiment, one annular groove 4011 is provided, and a sealing ring 6 is provided in the annular groove 4011. The sealing ring 6 is provided in the annular groove 4011 to achieve sliding sealing contact between the fixed valve core 4 and the connecting port 104, thereby improving the sealing between the fixed valve core 4 and the connecting port 104, preventing fluid leakage, and ensuring the working reliability of the solenoid valve.

[0034] The bobbin 101 of this embodiment can be used as a winding bobbin to conveniently wind the coil 2. The PIN needle facilitates the connection of the coil 2 to an external power supply. The setting of the magnetic yoke 9 can enhance the strength of the magnetic field and improve the control effect of the solenoid valve. The moving valve core 3, the fixed valve core 4 and the magnetic yoke 9 are all made of magnetic conductive materials, which can better interact with the magnetic field generated by the permanent magnet 5 and the coil 2.

[0035] For example Figure 1 and 2 As shown, the two ends of the yoke 9 of this embodiment have a first claw 901 and a second claw 902, the end of the bobbin 101 away from the fixed valve core 4 is provided with a first clamping groove engaged with the first claw 901, and the limiting edge 402 is provided with a second clamping groove engaged with the second claw 902. The cooperation of the first claw 901 and the first clamping groove, the second claw 902 and the second clamping groove can realize the rapid installation and fixation of the yoke 9, improve the assembly efficiency of the solenoid valve, and ensure the stability of the yoke 9.

[0036] Furthermore, in this embodiment, a mounting hole is provided at the center of the permanent magnet 5, and a third limiting groove 4012 is provided in an annular direction at one end of the fixed valve core 4 located in the inner cavity 1011, and a limiting column is reserved at the center of the third limiting groove 4012 so that the permanent magnet 5 can be fixedly sleeved on the fixed valve core 4 through the mounting hole. The design of the mounting hole, the third limiting groove 4012 and the limiting column can ensure that the permanent magnet 5 is firmly mounted on the fixed valve core 4, and will not loosen or shift during operation, thereby ensuring the stability of the magnetic holding function.

[0037] like Figure 3As shown, as the magnetic holding solenoid valve of the second embodiment, compared with the first embodiment, installation grooves 301 are opened at both ends of the moving valve core 3, and the first sealing gasket 7 and the second sealing gasket 8 are respectively arranged in the installation grooves 301 at both ends of the moving valve core 3. During the sliding process of the moving valve core 3, the first sealing gasket 7 is used for sealing contact with the air vent B 103, and the second sealing gasket 8 is used for sealing contact with the air vent C 403, thereby effectively preventing fluid leakage, improving the sealing performance of the solenoid valve, and ensuring that the flow control of the fluid in the solenoid valve is more accurate.

[0038] Furthermore, if Figure 6 As shown, one end of the vent B 103 of this embodiment is designed to have a protrusion 12 inside the inner cavity 1011, and the opening of the inner end of the vent B 103 is a flat opening. The design of the vent B 103 protruding inward 12 can increase the stability of the connection between the vent B 103 and the moving valve core 3, and the flat opening can better seal with the first sealing gasket 7 of the moving valve core 3, reducing the risk of leakage.

[0039] Working principle: During operation, applying a positive pulse current of 200ms to the solenoid valve can achieve inflation. Then, when the PIN pin of the solenoid valve is energized, the current flows into the coil 2 through the PIN pin. At this time, the coil 2 generates a magnetic field, and the moving valve core 3 in the spool is magnetized by the coil magnetic field, and the magnetic pole is the same as the coil magnetic field. This magnetic field interacts with the magnetic field of the permanent magnet on the fixed valve core 4, generating a force that moves the moving valve core 3 toward the fixed valve core 4. Under the action of this force, the moving valve core 3 overcomes the force of the reset spring 11 and moves toward the fixed valve core 4 until the moving valve core 3 and the fixed valve core 4 are attracted. In this process, the first sealing gasket 7 is used to seal the contact with the vent B 103, and the second sealing gasket 8 is used to seal the contact with the vent C 403. When the moving valve core 3 and the fixed valve core 4 are attracted, the air path between the vent A 102 and the vent B 103 is opened to achieve circulation between the air paths.

[0040] Due to the presence of the permanent magnet, when the forward pulse current disappears, the magnetic field generated by the permanent magnet can maintain the position of the moving valve core 3, so that the moving valve core 3 continues to remain in the attracted state with the fixed valve core 4, so that continuous electrical energy is not required to keep the valve open, thereby greatly reducing the power consumption of the solenoid valve, which is particularly suitable for occasions where the open state needs to be maintained for a long time.

[0041] When the solenoid valve needs to be closed, a reverse pulse current of 200ms needs to be applied to the solenoid valve, that is, a reverse pulse current needs to be applied to the PIN pin. This reverse current changes the direction of the magnetic field generated by the coil 2. At this time, the coil 2 generates a magnetic field, and the moving valve core 3 in the bobbin is magnetized by the coil magnetic field, and the magnetic pole is opposite to the coil magnetic field. At this time, the magnetic field interacts with the magnetic field of the permanent magnet, generating a force away from the fixed valve core 4, which is in the opposite direction to the elastic force of the reset spring 11, causing the moving valve core to move away from the fixed valve core until the moving valve core 3 is separated from the fixed valve core 4. When the moving valve core 3 is separated from the fixed valve core 4 until the moving valve core 3 is against the vent B 103, the air path between the vent A 102 and the vent C 403 is opened, and the air flow between the air paths is realized.

[0042] When the reverse pulse current disappears, under the action of the reset spring 11, the movable valve core 3 always contacts the vent B 103, so that the air path remains in a closed state, preventing the fluid from entering the vent B 103, thereby ensuring the sealing of the system.

[0043] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A magnetic holding solenoid valve, comprising a winding bobbin and a coil (2) arranged on the winding bobbin, the winding bobbin having an inner cavity (1011), the inner cavity (1011) being provided with a movable valve core (3), one end of the winding bobbin being provided with an air vent A (102) and an air vent B (103) communicating with the inner cavity (1011), the other end of the winding bobbin being provided with a fixed valve core (4) via a connecting portion, the fixed valve core (4) being provided with an air vent C (403) communicating with the inner cavity (1011), characterized in that: The movable valve core (3) slides between the vent B (103) and the vent C (403) so as to seal the vent B (103) and the vent C (403); the fixed valve core (4) is provided with a permanent magnet (5) on the vent C (403) located in the inner cavity (1011); the movable valve core (3) and the fixed valve core (4) are both made of magnetic conductive materials; the vent A (102) is arranged at the edge of the inner cavity (1011), and the vent A (102) and the inner cavity (1011) partially overlap in the XY projection plane.

2. The magnetic holding solenoid valve according to claim 1, characterized in that: A return spring (11) is provided between the movable valve core (3) and the fixed valve core (4), and two ends of the return spring (11) respectively abut against one end of the movable valve core (3) and the fixed valve core (4) that are close to each other. The movable valve core (3) is provided with a first limiting groove (302) for the return spring (11) to be sleeved, and the fixed valve core (4) is provided with a second limiting groove (501) for the return spring (11) to be sleeved.

3. The magnetic holding solenoid valve according to claim 1 or 2, characterized in that: A side surface of the movable valve core (3) is provided with a clearance surface (303) parallel to the Z axis, and at least one clearance surface (303) is arranged close to the vent A (102).

4. The magnetic holding solenoid valve according to claim 3, characterized in that: A first sealing gasket (7) and a second sealing gasket (8) are respectively provided at both ends of the movable valve core (3); the first sealing gasket (7) is used for sealing contact with the vent B (103), and the second sealing gasket (8) is used for sealing contact with the vent C (403).

5. The magnetic holding solenoid valve according to claim 4, characterized in that: One end of the vent B (103) protrudes inward (12) and the opening at the inner end of the vent B (103) is flat.

6. The magnetic holding solenoid valve according to claim 3, characterized in that: The connecting portion comprises a connecting port (104) opened at one end of the winding spool, the cross section of the fixed valve core (4) is a T-shaped structure, the fixed valve core (4) comprises a valve core body (401) and a limiting edge (402), the valve core body (401) is slidably sealed and inserted into the connecting port (104), and the limiting edge (402) is left outside the connecting port (104).

7. The magnetic holding solenoid valve according to claim 6, characterized in that: At least one annular groove (4011) is provided on the circumferential surface of the valve core body (401), and a sealing ring (6) is provided in the annular groove (4011).

8. The magnetic holding solenoid valve according to claim 7, characterized in that: The winding bobbin is a bobbin (101), both wiring ends of the bobbin (101) are connected to PIN pins (10), a magnetic yoke (9) is installed on the bobbin (101), one end of the magnetic yoke (9) is connected to the outer end of the fixed valve core (4), and the magnetic yoke (9) is also made of magnetic conductive material.

9. The magnetic holding solenoid valve according to claim 1, characterized in that: A mounting hole is provided at the center of the permanent magnet (5); a third limiting groove (4012) is provided in an annular direction at one end of the fixed valve core (4) located in the inner cavity (1011); a limiting column is left at the center of the third limiting groove (4012) so that the permanent magnet (5) can be fixedly sleeved on the fixed valve core (4) through the mounting hole.

10. The magnetic holding solenoid valve according to claim 8, characterized in that: The two ends of the magnetic yoke (9) are provided with a first clamping claw (901) and a second clamping claw (902); the end of the spool (101) away from the fixed valve core (4) is provided with a first clamping groove engaged with the first clamping claw (901); and the limiting edge (402) is provided with a second clamping groove engaged with the second clamping claw (902).

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