CN210566563U - Electromagnetic valve - Google Patents

Abstract

The utility model relates to a solenoid valve, including position detection device, position detection device includes permanent magnet and hall sensor, permanent magnet and valve shaft fixed connection, the movable core is close to the one end setting of valve shaft, the permanent magnet is close to the other end setting of valve shaft, the permanent magnet is kept away from the setting of coil part, the permanent magnet is located the inner chamber that the valve body formed, along the axial of valve shaft, first case and second case are located between permanent magnet and coil part, hall sensor and the fixed setting of valve body; the permanent magnet and the Hall sensor are arranged far away from the coil component, so that the interference of magnetic flux leakage of the coil component can be reduced, and the reliability of position detection is improved.

Description

Electromagnetic valve

[ technical field ] A method for producing a semiconductor device

The utility model relates to a valve gear technical field, concretely relates to solenoid valve.

[ background of the invention ]

The electromagnetic valve comprises a coil component, a fixed core, a fixable core, a valve shaft and a position detection component, wherein the valve shaft is connected with the movable core, a permanent magnet of the position detection component is installed on the valve shaft at a position close to the upper end face of the coil component, and a Hall sensor of the position detection component is arranged at a position close to the upper end face of the coil component and used for detecting the position of the permanent magnet so as to detect the displacement of the valve shaft. However, the position detecting member provided in this way is susceptible to interference by magnetic flux leakage from the coil member, and thus affects the reliability of position detection.

[ Utility model ] content

The utility model provides a solenoid valve can reduce the interference of coil part magnetic leakage when detecting valve shaft displacement, is favorable to improving the reliability that the position detected.

To achieve the above object, the present invention provides a solenoid valve, comprising a coil component, a valve body, a movable core, a fixed core, a valve shaft and a casing, wherein the valve shaft is connected to the movable core, the movable core and a part of the fixed core are located inside the casing, the coil component is located outside the casing, the valve body comprises an inflow pipe, a first outflow pipe, a second outflow pipe, a first valve core and a second valve core, the solenoid valve comprises a first valve seat and a second valve seat, the first valve seat comprises a first valve port, the second valve seat comprises a second valve port, the first valve core and the second valve core are fixedly connected to the valve shaft, the first valve core comprises a first sealing device, the second valve core comprises a second sealing device, the first sealing device is in contact with or separated from the first valve seat so that the first valve port is opened or closed, the inflow connecting pipe is communicated with or cut off from the first outflow connecting pipe; the second sealing device is contacted with or separated from the second valve seat, so that the second valve port is opened or closed, and the inflow connecting pipe and the second outflow connecting pipe are communicated or cut off; the electromagnetic valve further comprises a position detection device, the position detection device comprises a permanent magnet and a Hall sensor, the permanent magnet is fixedly connected with the valve shaft, the movable core is close to one end of the valve shaft, the permanent magnet is close to the other end of the valve shaft, the permanent magnet is far away from the coil component, the permanent magnet is located in an inner cavity formed by the valve body, the first valve core and the second valve core are located between the permanent magnet and the coil component along the axial direction of the valve shaft, and the Hall sensor is fixedly arranged with the valve body.

The solenoid valve provided by the embodiment comprises a position detection device, wherein the position detection device comprises a permanent magnet and a Hall sensor, the permanent magnet is fixedly connected with the valve shaft, the permanent magnet is far away from the coil component and is positioned in an inner cavity formed by the valve body, and the Hall sensor is fixedly arranged with the valve body and is also far away from the coil component; thus, the permanent magnet and the Hall sensor of the position detection device are both arranged far away from the coil component, so that the interference of magnetic flux leakage of the coil component can be reduced, and the reliability of position detection is improved.

Drawings

Fig. 1 is a schematic cross-sectional view of a solenoid valve in a first position according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of the solenoid valve in a second position according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;

FIG. 4 is an enlarged view of the structure at B in FIG. 2;

FIG. 5 is a perspective view of the first valve body of FIG. 1;

FIG. 6 is a cross-sectional structural view of the first valve body of FIG. 1;

FIG. 7 is a perspective view of the second valve body of FIG. 1;

FIG. 8 is a cross-sectional structural view of the second valve body of FIG. 1;

FIG. 9 is a schematic view of one construction of an E-ring;

FIG. 10 is a graph illustrating the distance between the permanent magnet and the Hall sensor versus the output voltage;

FIG. 11 is an enlarged schematic view of another embodiment at A in FIG. 2;

fig. 12 is an enlarged schematic view of a further embodiment at a in fig. 2.

Detailed Description

Technical features and advantages of embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic cross-sectional structure diagram of a solenoid valve 100 in a first position according to an embodiment of the present invention, and fig. 2 is a schematic cross-sectional structure diagram of the solenoid valve 100 in a second position according to an embodiment of the present invention. The solenoid valve 100 is used for fluid control, with the direction of fluid indicated by the arrows, although the opposite direction may be used. The solenoid valve 100 includes a coil member 1, a valve body 2, a movable core 3, a fixed core 4, a valve shaft 5, and a sleeve 6. The solenoid valve 100 further includes a pressing plate 7, the pressing plate 7 is disposed between the coil component 1 and the valve body 2, the pressing plate 7 is fixedly connected to the fixing core 4, and the coil component 1 is fixedly connected to the valve body 2. The coil component 1 includes a coil 11 and a bobbin 12, and the coil 11 is wound around the bobbin 12. The movable core 3 and part of the fixed core 4 are positioned inside the sleeve 6, the coil component 1 is positioned outside the sleeve 6, the valve shaft 5 is fixedly connected with the movable core 3, an excitation magnetic field is generated after the coil component 1 is electrified, and the movable core 3 can move in the axial direction L relative to the fixed core 3 under the action of the excitation magnetic field and drive the valve shaft 5 to move together.

Referring to fig. 1 and 2, in the present embodiment, the valve body 2 includes an inlet connection pipe 211, a first outlet connection pipe 212, a second outlet connection pipe 221, and a first valve core 81 and a second valve core 82, the solenoid valve 100 has a first valve seat 213 and a second valve seat 214, the first valve seat 213 has a first valve port 2131, and the second valve seat 214 has a second valve port 2141; in this embodiment, the valve body 2 includes a first valve body 21 and a second valve body 22, the first valve body 21 and the second valve body 22 are separately formed and then fixedly connected, wherein the second valve body 22 is farther from the coil component 1 than the first valve body 21, the inflow connection pipe 211, the first outflow connection pipe 212, the first valve seat 213, and the second valve seat 214 are formed in the first valve body 21, and the second outflow connection pipe 221 is formed in the second valve body 22, although in other embodiments, the first valve body 21 and the second valve body 22 may be integrally formed; the first valve core 81 and the second valve core 82 are fixedly connected with the valve shaft 5, the second valve core 82 is far away from the coil component 1 than the first valve core 81, the valve body 2 is provided with a valve chamber 23, one end of the valve shaft 5 extends into the valve chamber 23, the first valve core 81 comprises a first sealing device 811, the second valve core 82 comprises a second sealing device 821, the first sealing device 811 is contacted with or separated from the first valve seat 213 to open or close the first valve port 2131, so that the inflow connecting pipe 211 is communicated with or closed off the first outflow connecting pipe 212; the second sealing device 821 is in contact with or separated from the second valve seat 214, so that the second valve port 2141 is opened or closed, and the inflow connection pipe 211 and the second outflow connection pipe 221 are connected or disconnected. The solenoid valve 100 further includes an elastic member 9, the elastic member 9 is located between the movable core 3 and the fixed core 4, specifically, the fixed core 4 has a groove, one end of the elastic member 9 is in contact with the movable core 3, the other end of the elastic member 9 is in contact with the fixed core 4, and at least a part of the elastic member 9 is located in the groove of the fixed core 4. When the coil 11 is not energized, the elastic member 9 can relatively separate the movable core 3 from the fixed core 4. The solenoid valve 100 further includes a magnetic conductor 10, the magnetic conductor 10 is cylindrical, and the magnetic conductor 10 is sleeved on the periphery of the coil component 1.

The solenoid valve 100 further comprises a position detection device, the position detection device comprises a permanent magnet 30 and a hall sensor 40, the movable core 3 is arranged at one end close to the valve shaft 5, the permanent magnet 30 is arranged at the other end close to the valve shaft 5, the permanent magnet 5 is arranged far away from the coil component 1, the permanent magnet 30 extends into an inner cavity formed by the valve body 2, the first valve core 81 and the second valve core 82 are arranged between the permanent magnet 30 and the coil component 1 along the axial direction of the valve shaft 5, and the hall sensor 40 is fixedly arranged with the valve body 2. The movable core 3 drives the valve shaft 5 to move, the valve shaft 5 drives the permanent magnet 30, the first valve core 81 and the second valve core 82 to axially move, and the position detection of the first valve core 81 and the second valve core 82 can be realized through the position detection device.

Referring to fig. 1, 5-8, the first valve body 21 is fixedly connected with the second valve body 22, the first valve body 21 has a first main body portion 217, and the second valve body 22 has a second main body portion 227; in this embodiment, the first valve body 21 and the second valve body 22 are fixed by screws, so that they can be easily disassembled. The lower end portion of the first body portion 217 of the first valve body 21 is formed with a protrusion 2171, the protrusion 2171 is provided with an internal thread, in this embodiment, the number of the protrusions 2171 is 4, the upper end portion of the second body portion 227 of the second valve body 22 is formed with 4 convex portions 222 corresponding to the first valve body 21, the 4 protrusion portions 2171 of the first valve body 21 are in abutting engagement with the 4 convex portions 222 of the second valve body 22, and a screw is passed through the convex portions 222 and the internal thread of the protrusion 2171 to screw and fix the first valve body 21 and the second valve body 22. The first valve element 21 has a first cylindrical portion 215, the inner peripheral surface of the first cylindrical portion 215 includes a first step surface 2151, the first cylindrical portion 215 protrudes downward from the first body portion 217 of the first valve element 21, and 4 protrusions 2171 are formed on the outer periphery of the first cylindrical portion 215; referring to fig. 1, 6, and 7, the second valve body 22 has a second cylindrical portion 223, the second cylindrical portion 223 protruding upward from the second main body portion 227 of the second valve body 22, and the outside of the second cylindrical portion 223 includes a second stepped surface 2231; the first cylindrical portion 215 is sleeved on the outer periphery of the second cylindrical portion 223, and after the first cylindrical portion 215 is sleeved on the outer periphery of the second cylindrical portion 223, a gap 218 is formed between the first step surface 2151 and the second step surface 2231. The solenoid valve 100 further includes a first seal ring 201, the first seal ring 201 is positioned between the first cylindrical portion 215 and the second cylindrical portion 223 and seals a gap between the first cylindrical portion 215 and the second cylindrical portion 223, and the first step surface 2151 and the second step surface 2231 press the first seal ring 201 to seal the gap between the first cylindrical portion 215 and the second cylindrical portion 223 and prevent fluid leakage. Of course, in other embodiments, the first valve body 21 and the second valve body 22 may be fixed by welding.

Referring to fig. 1, 2 and 3, fig. 3 is an enlarged schematic view of a portion a in fig. 2. In this embodiment, the permanent magnet 30 is fixed to the valve shaft 5, and the permanent magnet 30 is mounted near the end of the valve shaft 5 away from the movable core 3, so that the position detecting device can reduce the interference of the leakage flux from the coil member. The permanent magnet 30 is located in the interior cavity formed by the second body portion 227 of the second valve body 22. In this embodiment, the permanent magnet 30 is annular, the solenoid valve 100 further includes a permanent magnet fixing device 301, the permanent magnet fixing device 301 includes a protection component 3011 and a clamping component 3012, the protection component 3011 includes a plastic material, the protection component 3011 is formed by injection molding using the permanent magnet 30 as an insert, the protection component 3011 covers one side of the inner diameter of the permanent magnet 30, the protection component 3011 includes a large-diameter portion 3013 and a small-diameter portion 3014, two ends of the protection component 3011 are respectively a large-diameter portion 3013, the middle is a small-diameter portion 3014, the outer circumferential surface of the small-diameter portion 3014 and the inner circumferential surface of the large-diameter portion 3013 form an annular groove 3015, a part of the permanent magnet 30 is located in. The permanent magnet 30 and the protector 3011 are integrally fitted to the valve shaft 5. Protection piece 3011 is fixed through joint spare 3012 joint, in this embodiment, the quantity of joint spare is two, joint spare 3012 is respectively at protection piece 3011 both ends, the draw-in groove joint that sets up on two joint spares 3012 and the valve shaft 5 is fixed, two joint spares 3012 respectively with the both ends butt of protection piece 3011, thereby fix permanent magnet 30 on valve shaft 5, ensure that can not produce axial displacement at permanent magnet 30 relative valve shaft 5, simultaneously, set up plastics material's protection piece 3011 and can prevent to cause permanent magnet 30 to damage when installing or using. Referring to fig. 9, in this embodiment, the clamping member 3012 is an E-shaped ring, but of course, the clamping member may also use a bearing clamp or a mixture of the E-shaped ring and the bearing clamp, and the clamping member may also be other structures that can achieve the same function. Referring to fig. 2 and 11, in other embodiments, the protection component 3011 covers all the permanent magnets 30 by injection molding, so that the permanent magnets 30 can be isolated from the external working medium.

Referring to fig. 2 and 12, in another embodiment of the solenoid valve 100, the permanent magnet 30 is fixed to one end of the valve shaft 5, in this embodiment, the permanent magnet is a solid structure, and may also be a ring structure, the permanent magnet fixing device 302 includes an injection molded part 3021 and a bushing 3022, the injection molded part 3021, the bushing 3022 and the permanent magnet 30 are integrated by injection molding, the injection molded part 3021 covers the permanent magnet 30, the injection molded part 3021 covers part of the bushing 3022, and the injection molded part 3021, the bushing 3022 and the permanent magnet 30 are fixedly connected to the valve shaft 5 as a whole, specifically, the valve shaft 5 passes through a central hole of the bushing 3022 and extends into an installation groove 3023 of the injection molded part 3021, and the bushing 3022 and the valve shaft 5 are fixed by welding, which includes laser welding, and for convenience of welding, in this embodiment, the bushing 3022 and the valve shaft. The bushing 3022 has a recess 3024, and the recess 3024 is recessed from the outer circumference of the bushing 3022, and the recess 3024 is provided to prevent the injection molded part 3021 from falling off the bushing 3022. In this embodiment, the permanent magnet 30 is overlapped with the axis of the valve shaft 5, and the permanent magnet 30 is located right below the valve shaft 5, but in other embodiments, the permanent magnet 30 may be deviated from the axis of the valve shaft 5 or disposed beside the valve shaft 5. The injection molding 3021 coats the permanent magnet 30, so that the permanent magnet 30 can be isolated from an external working medium, and meanwhile, the injection molding 3021 is simple in structure and beneficial to improving the assembly efficiency.

Referring to fig. 1 and 8, the hall sensor 40 is provided to the second valve body 22. The second valve body 22 further includes a box 224, the box 224 is located in the second body 227 of the second valve body 22, in this embodiment, the box 224 is located at the lower end of the second body 227, the box 224 includes a first housing 2241, a cover 2242, a circuit board 2243 and a connector 2244, the first housing 2241 and the second valve body 22 are integrally formed, the circuit board 2243 is installed in an inner cavity formed by the box 224, in this embodiment, the circuit board 2243 is located in the inner cavity formed by the first housing 2241, and the cover 2242 and the first housing 2241 are fixedly connected and sealed by welding. The connector 2244 is integrally formed with the first housing 2241, the connector 2244 includes pins 2245, the pins 2245 are electrically connected and/or signal-connected to the circuit board 2243, and the solenoid valve is connected to an external device through the connector 2244. In this embodiment, the second valve body 22 is formed with the positioning columns 225, in this embodiment, the number of the positioning columns 225 is 4, and the circuit board 2243 and the second valve body 22 are fixed by hot riveting or tight fitting through the positioning columns 225, and of course, in other embodiments, they may be fixed by screws, bolts or clamping. The Hall sensor 40 is located on the circuit board 2243 and faces one side of the permanent magnet 30, the Hall sensor 40 is electrically connected with the circuit board 2243 and/or in signal connection, the Hall sensor 40 detects a magnetic field generated by the permanent magnet 30, signals collected by the Hall sensor 40 are output after being processed by the circuit board 2243, and the circuit board 2243 outputs an electric signal representing the magnetic field intensity generated by the permanent magnet 30. In this embodiment, the hall sensor 40 is disposed in the axial direction of the valve shaft 5, and when the hall sensor 40 is disposed under the permanent magnet 30, a larger magnetic density can be obtained at the same distance, and in other embodiments, the hall sensor 40 may also deviate from the axial direction of the valve shaft 5 or be disposed in the lateral direction of the permanent magnet 30. The circuit board 2243 has an amplifying and conditioning circuit and a filtering protection circuit, so that the quality of the output signal of the hall sensor 40 can be improved, interference can be reduced, a protection effect can be achieved, and the hall sensor and the circuit board can be prevented from being damaged. The permanent magnet 30, the hall sensor 40, and the wiring board are disposed apart from the coil component 1, so that interference of magnetic flux leakage of the coil can be reduced, and reliability of position detection can be improved. In other facility examples, the circuit board can further include singlechip and temperature sensor, perhaps the singlechip contains temperature sensor inside, and temperature sensor measures ambient temperature, obtains the temperature characteristic of hall sensor under the different temperatures, and the singlechip carries out software compensation according to the data that temperature sensor detected, can further improve the precision that the position detected through temperature compensation. Of course, in other embodiments, other methods such as a compensation circuit may be used to perform temperature compensation to improve system accuracy.

In this embodiment, the larger the magnetic field strength is, the larger the voltage generated by the hall sensor is, the closer the distance between the permanent magnet and the hall sensor is, the stronger the magnetic field strength sensed by the hall sensor is, and the larger the output voltage is. Referring to fig. 10, fig. 10 is a graph illustrating a distance between the permanent magnet 30 and the hall sensor 40 versus an output voltage, an abscissa indicates a distance between the permanent magnet 30 and the hall sensor 40, an ordinate indicates a voltage magnitude output by the hall sensor 40, where the voltage indicates an output voltage processed by the circuit board 2243, when the distance between the permanent magnet 30 and the hall sensor 40 is at a set farthest distance, i.e., at a position of L1 in the figure, the voltage output by the hall sensor 40 is U1, and when the distance between the permanent magnet 30 and the hall sensor 40 is at a set closest distance, i.e., at a position of L2 in fig. 10, the voltage output by the hall sensor is U2.

Referring to fig. 1, 2 and 4, fig. 4 is an enlarged schematic structural view of a portion B in fig. 2. The first spool 81 and the second spool 82 have similar structures, and the first spool 81 will be specifically described as an example. The first valve core 81 includes a first sealing device 811, a blocking piece 812, and a snap-in member 813. The first sealing device 811 is made of an elastic material, and can be deformed after being compressed, so as to be convenient for sealing the first valve port 2131 by being matched with the first valve seat 213. The baffle 812 comprises a first baffle 8121 and a second baffle 8122, the first baffle 8121 and the second baffle 8122 are annular and made of a material with a relatively hard texture, the first baffle 8121 is attached to the upper surface of the first sealing device 811, the second baffle 8122 is attached to the lower surface of the first sealing device 811, and the baffle 812 supports the first sealing device 811, wherein the outer diameter of the first baffle 8121 is the same as that of the first sealing device 811, the outer diameter of the first baffle 8121 is larger than that of the second baffle 8122, and part of the first sealing device 811 is not covered by the second baffle 8122. The clamping part 813 comprises a first clamping part 8131 and a second clamping part 8132, the first clamping part 8131 is fixedly clamped with the valve shaft 5 and abutted to a first blocking piece 8121, the moving distance of the first blocking piece 8121 relative to the valve shaft 5 to the movable core 3 is limited, the second clamping part 8132 is fixedly clamped with the valve shaft 5 and abutted to a second blocking piece 8122, the moving distance of the second blocking piece 8122 relative to the valve shaft to the movable core 3 is limited, and the clamping part 813 plays a supporting and limiting role for the first sealing device 811 and the blocking piece 812. Referring to fig. 6, the first valve seat 213 has an annular protrusion 2132 formed at the first valve port 2131, the annular protrusion 2132 protrudes from the first valve seat 213 toward the first sealing device 811, and a portion of the first sealing device 811 not covered by the second flap 8122 abuts against and engages with the annular protrusion 2132, thereby sealing the first valve port 2131. The second valve core 82 has a structure similar to that of the first valve core 81, the second valve seat 214 has a structure similar to that of the first valve seat 213, the second valve core 82 is configured to be engaged with the second valve seat 214, the second valve seat 214 is formed with an annular protrusion at the second valve opening 2141, the annular protrusion protrudes from the second valve seat 214 toward the second sealing device 821, and a portion of the second sealing device 821, which is not covered by the flap, is abutted against and engaged with the annular protrusion to seal the second opening 2141. Referring to fig. 9, in this embodiment, the clamping member 813 is an E-shaped ring, but of course, the clamping member may also be a bearing clamp or a mixture of the E-shaped ring and the bearing clamp, and the clamping member may also be other structures capable of achieving the same function.

Referring to fig. 1 and 2, in the present embodiment, the lower end of the sleeve 6 is provided with an annular bend 61, the annular bend 61 extends outward from the sidewall of the sleeve 6, and the solenoid valve 100 further includes a second seal ring 202, and the second seal ring 202 abuts against the lower surface of the annular bend 61, the outer periphery of the fixed core 4, and the pressure plate 7, respectively, so as to seal gaps between the sleeve 6 and the fixed core 4, and between the fixed core 4 and the pressure plate 7, and prevent fluid leakage. A third seal ring 203 is also provided between the pressure plate 7 and the first valve body 21 to seal a gap between the pressure plate 7 and the first valve body 21 and prevent fluid from leaking.

The state of the solenoid valve 100 includes a first position and a second position. Referring to fig. 1, the solenoid valve is in the first position, the coil 11 is in the energized state, the movable core 3 is adsorbed to the fixed core 4, the first sealing device 811 abuts against the first valve seat 213, the first sealing device 811 closes the first valve port 2131, and the inflow connection pipe 211 and the first outflow connection pipe 212 are blocked; the second sealing device 821 is not in contact with the second valve seat 214, the second valve port 2141 is opened, and the inlet connection pipe 211 and the second outlet connection pipe 221 are connected.

Referring to fig. 1 and 2, when the solenoid valve 100 is at the second position, the coil 11 is in the power-off state, and the second position is that after the coil 11 is powered off, the movable core 3 is away from the fixed core 4 due to the action of the elastic component 9, the first sealing device 811 does not abut against the first valve seat 213, the first valve port 2131 is opened, and the inflow connection pipe 211 is communicated with the first outflow connection pipe 212; the second seal device 821 abuts against the second valve seat 214, the second seal device 821 closes the second valve port 2141, and the inlet connection pipe 211 and the second outlet connection pipe 221 are closed.

Referring to fig. 1, 2, and 10, the movable core 3 drives the valve shaft 5 to move, and the valve shaft 5 drives the permanent magnet 30, the first valve element 81, and the second valve element 82 to move, in this embodiment, the permanent magnet 30 is axially magnetized, the N pole and the S pole can be interchanged, and the closer the distance between the permanent magnet 30 and the hall sensor 40 is, the stronger the magnetic field strength sensed by the hall sensor 40 is, the larger the output voltage is. Fig. 10 is a graph illustrating a distance between the permanent magnet 30 and the hall sensor 40 and an output voltage, wherein an abscissa indicates a distance between the permanent magnet 30 and the hall sensor 40, an ordinate indicates a voltage output by the hall sensor 40, the voltage here indicates a voltage output after being processed by the circuit board 2243, when the solenoid valve is at a first position, the first sealing device 811 closes the first valve port 2131, the first valve port 2131 is at a fully closed position, the second valve port 2141 is at a fully open position, the permanent magnet 30 is closest to the hall sensor 40, that is, at a position L2 in fig. 10, and the voltage output by the hall sensor is U2; when the solenoid valve is in the second position, the second sealing device 821 closes the second valve port 2141, and at this time, the second valve port 2141 is in the fully closed position, the first valve port 2131 is in the fully open position, the permanent magnet 30 is farthest away from the hall sensor 40, that is, in the position L1 in fig. 10, and the voltage output by the hall sensor is U1. The position detection device is added to detect the working state of the electromagnetic valve, including whether the electromagnetic valve is in a fully closed position or a fully open position, so that the reliability of the system can be improved, and the permanent magnet 30 and the Hall sensor 40 are both arranged far away from the coil component, so that the interference of magnetic leakage of the coil component can be reduced, and the reliability of position detection can be improved.

It should be noted that: the above embodiments are only used for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solutions and modifications thereof can be modified or substituted by the same by those skilled in the art without departing from the spirit and scope of the present invention, which should be covered by the claims of the present invention.

Claims (12)

1. A solenoid valve comprising a coil member, a valve body, a movable core, a fixed core, a valve shaft, and a sleeve, the valve shaft being connected to the movable core, the movable core and a part of the fixed core being located inside the sleeve, the coil member being located outside the sleeve, characterized in that: the valve body comprises an inflow connecting pipe, a first outflow connecting pipe, a second outflow connecting pipe, a first valve core and a second valve core, the solenoid valve is provided with a first valve seat and a second valve seat, the first valve seat is provided with a first valve port, the second valve seat is provided with a second valve port, the first valve core and the second valve core are fixedly connected with the valve shaft, the first valve core comprises a first sealing device, the second valve core comprises a second sealing device, and the first sealing device is in contact with or separated from the first valve seat to open or close the first valve port, so that the inflow connecting pipe and the first outflow connecting pipe are communicated or cut off; the second sealing device is contacted with or separated from the second valve seat, so that the second valve port is opened or closed, and the inflow connecting pipe and the second outflow connecting pipe are communicated or cut off; the electromagnetic valve further comprises a position detection device, the position detection device comprises a permanent magnet and a Hall sensor, the permanent magnet is fixedly connected with the valve shaft, the movable core is close to one end of the valve shaft, the permanent magnet is close to the other end of the valve shaft, the permanent magnet is far away from the coil component, the permanent magnet is located in an inner cavity formed by the valve body, the first valve core and the second valve core are located between the permanent magnet and the coil component along the axial direction of the valve shaft, and the Hall sensor is fixedly arranged with the valve body.

2. The solenoid valve according to claim 1, wherein the valve body comprises a first valve body and a second valve body, and the first valve body and the second valve body are separately formed and fixedly connected; the inlet connection, the first outlet connection, the first valve seat and the second valve seat are formed in the first valve body, and the second outlet connection is formed in the second valve body.

3. The electromagnetic valve according to claim 2, wherein the electromagnetic valve comprises a permanent magnet fixing device, the permanent magnet fixing device comprises a protecting piece and a clamping piece, the protecting piece is formed by injection molding by taking the permanent magnet as an insert, the protecting piece covers part or all of the permanent magnet, and the protecting piece and the permanent magnet are sleeved on the valve shaft and are clamped and fixed through the clamping piece.

4. The electromagnetic valve according to claim 2, characterized in that the electromagnetic valve comprises a permanent magnet fixing device, the permanent magnet fixing device comprises an injection molding part and a bushing, the injection molding part, the bushing and the permanent magnet are integrated through injection molding, the injection molding part covers the permanent magnet, the injection molding part covers part of the bushing, the injection molding part, the bushing and the permanent magnet are fixedly connected with the valve shaft as a whole, the tail end of the valve shaft penetrates through a center hole of the bushing and extends into a mounting groove of the injection molding part, and the bushing and the valve shaft are fixed through welding.

5. The electromagnetic valve according to claim 3 or 4, wherein the hall sensor is arranged on the second valve body, the second valve body comprises a box body, the box body comprises a first shell, a cover plate and a circuit board, the first shell and the second valve body are integrally formed, the circuit board is positioned in a cavity formed by the first shell, the second valve body is formed with a positioning column, and the circuit board is fixedly connected with the second valve body through the positioning column; the cover plate is fixedly connected with the first shell; the Hall sensor is located the circuit board, the Hall sensor detects the magnetic field that the permanent magnet produced, the signal that the Hall sensor gathered is through the circuit board is handled the back output, the circuit board output shows the signal of telecommunication of the magnetic field intensity that the permanent magnet produced.

6. The electromagnetic valve according to claim 2, 3 or 4, characterized in that the lower end portion of the first valve body is formed with a boss provided with an internal thread; the upper end part of the second valve body is provided with a convex part, and the convex part is provided with internal threads; the convex part of the first valve body is matched with the convex part of the second valve body in an abutting mode and fixedly connected through a screw.

7. The electromagnetic valve according to claim 5, wherein a lower end portion of the first valve body is formed with a boss portion provided with an internal thread; the upper end part of the second valve body is provided with a convex part, and the convex part is provided with internal threads; the convex part of the first valve body is matched with the convex part of the second valve body in an abutting mode and fixedly connected through a screw.

8. The electromagnetic valve according to claim 6, wherein the first valve body has a first body portion, the second valve body has a second body portion, the first valve body has a first cylindrical portion provided to protrude downward from the first body portion, and the protrusion is formed on an outer periphery of the first cylindrical portion; the second valve body has a second cylindrical portion protruding upward from the second main body portion; the first cylindrical part is sleeved on the periphery of the second cylindrical part, a first sealing ring is arranged between the first cylindrical part and the second cylindrical part, and a gap between the first cylindrical part and the second cylindrical part is sealed.

9. The electromagnetic valve according to claim 7, wherein the first valve body has a first body portion, the second valve body has a second body portion, the first valve body has a first cylindrical portion provided to protrude downward from the first body portion, and the protrusion is formed on an outer periphery of the first cylindrical portion; the second valve body has a second cylindrical portion protruding upward from the second main body portion; the first cylindrical part is sleeved on the periphery of the second cylindrical part, a first sealing ring is arranged between the first cylindrical part and the second cylindrical part, and a gap between the first cylindrical part and the second cylindrical part is sealed.

10. The electromagnetic valve according to claim 8 or 9, wherein the first valve spool includes a first sealing device, a blocking piece, and a clamping member, the blocking piece includes a first blocking piece and a second blocking piece, the first blocking piece supports an upper surface of the first sealing device and covers the upper surface of the first sealing device, and the second valve blocking piece supports a lower surface of the first sealing device and covers a part of the lower surface of the first sealing device; the clamping part comprises a first clamping part and a second clamping part, the first clamping part and the valve shaft are clamped and fixedly limited to limit the moving distance of the first blocking piece relative to the valve shaft to the movable core, the second clamping part and the valve shaft are clamped and fixedly limited to limit the moving distance of the second blocking piece relative to the valve shaft to the movable core, and the clamping part supports and fixes the first sealing device and the blocking piece; and the part of the first sealing device which is not covered by the second baffle is in butt fit with the first valve seat to seal the first valve seat.

11. The electromagnetic valve according to claim 10, wherein the coil member and the valve body are fixed by a pressing plate, an annular bent portion is formed at a lower end of the sleeve, the annular bent portion extends outward from a side wall of the sleeve and protrudes outward from the sleeve, and the electromagnetic valve further includes a second seal ring that abuts against a lower surface of the annular bent portion, an outer periphery of the fixed core, and the pressing plate, respectively, so as to seal a gap between the sleeve and the fixed core, and a gap between the fixed core and the pressing plate.

12. The solenoid valve according to claim 1, wherein the valve body comprises a first valve body and a second valve body, and the first valve body and the second valve body are separately formed and fixedly connected; the inlet connection, the first outlet connection, the first valve seat and the second valve seat are formed in the first valve body, and the second outlet connection is formed in the second valve body; the electromagnetic valve comprises a permanent magnet fixing device, the permanent magnet fixing device comprises a protecting piece and a clamping piece, the protecting piece is formed by injection molding by taking the permanent magnet as an insert, the protecting piece covers part or all of the permanent magnet, and the protecting piece and the permanent magnet are sleeved on the valve shaft and are clamped and fixed through the clamping piece; the electromagnetic valve comprises a permanent magnet fixing device, the permanent magnet fixing device comprises an injection molding part and a bushing, the injection molding part, the bushing and the permanent magnet are combined into a whole through injection molding, the injection molding part coats the permanent magnet, the injection molding part coats part of the bushing, the injection molding part, the bushing and the permanent magnet are fixedly connected with the valve shaft as a whole, the tail end of the valve shaft penetrates through a center hole of the bushing and extends into an installation groove of the injection molding part, and the bushing and the valve shaft are fixed through welding; the Hall sensor is arranged on the second valve body, the second valve body comprises a box body, the box body comprises a first shell, a cover plate and a circuit board, the first shell and the second valve body are integrally formed, the circuit board is located in a cavity formed by the first shell, a positioning column is formed on the second valve body, and the circuit board is fixedly connected with the second valve body through the positioning column; the cover plate is fixedly connected with the first shell; the Hall sensor is positioned on the circuit board, the Hall sensor detects the magnetic field generated by the permanent magnet, the signal acquired by the Hall sensor is processed by the circuit board and then output, and the circuit board outputs an electric signal representing the magnetic field intensity generated by the permanent magnet; the lower end part of the first valve body is divided into a convex part, and the convex part is provided with internal threads; the upper end part of the second valve body is provided with a convex part, and the convex part is provided with internal threads; the convex part of the first valve body is matched with the convex part of the second valve body in an abutting mode and fixedly connected through a screw; the first valve body has a first main body portion, the second valve body has a second main body portion, the first valve body has a first cylindrical portion protruding downward from the first main body portion, and the protrusion portion is formed on the outer periphery of the first cylindrical portion; the second valve body has a second cylindrical portion protruding upward from the second main body portion; the first cylindrical part is sleeved on the periphery of the second cylindrical part, and a first sealing ring is arranged between the first cylindrical part and the second cylindrical part to seal a gap between the first cylindrical part and the second cylindrical part; the first valve core comprises a first sealing device, a blocking piece and a clamping component, wherein the blocking piece comprises a first blocking piece and a second blocking piece, the first blocking piece supports the upper surface of the first sealing device and covers the upper surface of the first sealing device, and the second valve blocking piece supports the lower surface of the first sealing device and covers part of the lower surface of the first sealing device; the clamping part comprises a first clamping part and a second clamping part, the first clamping part and the valve shaft are clamped and fixedly limited to limit the moving distance of the first blocking piece relative to the valve shaft to the movable core, the second clamping part and the valve shaft are clamped and fixedly limited to limit the moving distance of the second blocking piece relative to the valve shaft to the movable core, and the clamping part supports and fixes the first sealing device and the blocking piece; the part of the first sealing device which is not covered by the second baffle is in butt fit with the first valve seat to seal the first valve seat; the coil component with the valve body passes through the clamp plate fixedly, sheathed tube lower extreme is formed with annular portion of bending, annular portion of bending certainly the sheathed tube lateral wall outwards extends, to the protruding setting in sheathed tube outside, the solenoid valve still includes the second sealing washer, the second sealing washer respectively with the lower surface of annular portion of bending the periphery of fixed core and the clamp plate butt, thereby it is right the sleeve pipe with fixed core the fixed core with clearance between the clamp plate seals.

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