A solenoid valve

Abstract

The present invention relates to a solenoid valve, comprising a valve body, a valve seat, a valve sleeve with a wall thickness of 2.0-3.0 mm, and a valve core, all of which are ferromagnetic and have a cylindrical structure. A junction box is installed outside the valve body, a coil is embedded in the valve body, the valve sleeve and the valve seat are correspondingly installed at the upper and lower ends of the valve body and are partially embedded in the ring of the coil, and the relative surfaces are not in contact, the valve core is inserted into the valve sleeve and moves relative to the valve seat, a gap with a width of 0.8-1.5 mm is spaced between the valve core and the valve sleeve, a valve stem is detachably connected in the valve core, the lower part of the valve stem is sealed with the valve seat, the upper part is elastically connected with the valve seat, and the lower end of the valve core is provided with a magnetic isolation gasket with a thickness of 0.05-0.1 mm. In the invention, the valve body, valve seat, valve sleeve and valve core are all ferromagnetic. After the coil is energized, it attracts magnetism between each other, fully utilizing magnetism to move the valve stem to overcome the pressure difference force, thereby improving the opening and closing valve capacity of the solenoid valve.

Description

Technical Field

[0001] The present invention relates to the field of valve switches, and in particular to an electromagnetic valve that can effectively utilize magnetic force and improve the opening and closing ability. Background Art

[0002] An electromagnetic valve is an industrial device controlled by electricity magnetism. It is a basic automation component for controlling fluids and is used in industrial control systems to adjust parameters such as the direction, flow rate, speed, and others of the medium. The electromagnetic valve can cooperate with different circuits to achieve the expected control, and the control accuracy and flexibility are ensured according to the performance of the electromagnetic valve. There are many types of electromagnetic valves, and different electromagnetic valves play different roles in different positions of the control system. Existing electromagnetic valves all generate magnetic attraction after the electromagnetic coil is energized to overcome the elastic force of the spring, thereby driving the valve core to move, and then driving the piston rod, that is, the valve stem, to open and close the valve. At this time, there is a problem that the valve stem needs to overcome the elastic force of the spring when moving. In the existing structure, the entire magnetism in the electromagnetic valve cannot be fully utilized, and there will be a problem of insufficient magnetic force caused by the inability to utilize some magnetism in the structure. At the same time, when the electromagnetic attraction is too small or too large, the force of the electromagnetic valve to control the valve is insufficient, resulting in poor opening and closing ability of the electromagnetic valve and poor performance of the electromagnetic valve. Summary of the Invention

[0003] In view of the existing deficiencies, the present invention provides an electromagnetic valve that can effectively utilize magnetic force and improve the opening and closing ability.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows: A solenoid valve includes a valve body, a valve seat, a valve sleeve with a wall thickness of 2.0 - 3.0 mm, and a valve core, all of which are cylindrical structures and have ferromagnetism. A junction box is installed outside the valve body. An annular coil electrically connected to the junction box is embedded in the valve body. The valve sleeve and the valve seat are correspondingly installed at the upper and lower ends of the valve body and are both partially and fittingly embedded in the ring of the coil, and the opposite surfaces of the valve sleeve and the valve seat do not contact each other. The valve core is inserted into the valve sleeve and can move relative to the valve seat in the valve sleeve in opposite directions. A gap with a width of 0.8 - 1.5 mm is provided between the valve core and the valve sleeve. A valve rod with its upper and lower ends extending out of the upper and lower ends of the valve body is detachably connected inside the valve core. The lower part of the valve rod is hermetically connected to the valve seat at a position corresponding to the bottom end of the valve seat and is elastically connected to the valve seat at a position corresponding to the upper part of the valve seat. A magnetic isolation gasket with a thickness of 0.05 - 0.1 mm is provided at the lower end of the valve core; An annular first copper sleeve is fittingly embedded in the upper part of the valve seat. The first copper sleeve is sleeved outside the valve rod, and a spring is also sleeved outside the valve rod. The two ends of the spring are fixedly connected to the first copper sleeve and the valve rod respectively. The valve rod is hermetically connected to the valve seat through a Y-shaped sealing ring sleeved on its outside; Positioning pins for positioning the movement of the valve core are provided on the inner wall of the valve body; At least two cylindrical structures are provided on the valve body at intervals. Each cylindrical structure is provided with a coil, a valve seat, a valve sleeve, and a valve core. The junction box includes a box body. A circuit board electrically connected to the coil is provided inside the box body, and a socket provided on the box body and electrically connected to the circuit board; The socket is provided with a plurality of pins electrically connected to the circuit board, and the electrical conduction of different coils is controlled by the conduction between different pins.

[0005] Preferably, an external thread is provided outside the valve rod, and an internal thread is provided inside the valve core. The valve rod and the valve core are detachably connected through the cooperation of the internal and external threads. A magnetic isolation gasket is also provided at the upper end of the valve core. Coil sealing rings are provided at both the upper and lower ends of the coil. An annular second copper sleeve embedded on the inner wall of the valve sleeve is provided between the valve sleeve and the valve rod, and the second copper sleeve is sleeved on the outer wall of the valve rod.

[0006] Preferably, the upper end of the valve sleeve and the valve body are in the same plane. An annular retaining sleeve covers the upper end of the valve sleeve. An annular valve cover covering the upper end of the retaining sleeve is connected to the upper end of the valve body. A valve cover sealing ring is provided between the valve cover and the valve sleeve. A dust cover covering the top end of the valve rod is installed between the retaining sleeve and the valve cover.

[0007] Preferably, the valve body is a cylindrical structure with an n-shaped vertical section, the valve seat and the valve sleeve are cylindrical structures with an inverted T-shaped and T-shaped vertical section respectively. The upper end of the valve seat is provided with a stepped upper surface. The thickness of the vertical part of the stepped upper surface matches the thickness of the valve sleeve, and the thickness of the horizontal part matches the thickness of the valve core.

[0008] Preferably, the copper wire diameter of the coil is 0.27-0.30 mm.

[0009] Preferably, the box body is also provided with an indicator light electrically connected to the circuit board.

[0010] The beneficial effects of the present invention are as follows: in the present invention, the valve body, valve seat, valve sleeve and valve core are all ferromagnetic. After the coil is energized, magnetism will be generated on both sides of the coil. The valve body is wrapped around the outside of the coil, and the valve sleeve and valve seat are both located inside the valve body and the coil. The valve sleeve and valve seat will draw the magnetism of the valve body and the coil in. The valve core is located in the valve sleeve, and the valve core will draw the magnetism of the valve sleeve in. At this time, the valve sleeve and valve seat are not in contact with each other inside the coil, that is, there is a distance between them. Under the interaction of magnetic forces, the valve core is in the valve sleeve relative to the valve seat. The two valves move towards each other to close, and the moving distance of the valve core becomes the switching stroke of the solenoid valve. The valve stem is detachably connected to the valve core, and the valve stem moves in the valve core and the valve seat to achieve the action of opening and closing the valve. The magnetic attraction is increased by the mutual magnetization. At the same time, the thickness of the valve sleeve and the gap between it and the valve core ensure that the magnetic force is in the best state, which can attract magnetism without causing the problem of excessive suction, and effectively utilize their respective magnetism, thereby improving the opening and closing valve ability of the solenoid valve and enhancing the performance of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a cross-sectional structural schematic diagram of the present invention;

[0012] Figure 2 It is a schematic diagram of the top view structure of the present invention;

[0013] Parts names and serial numbers in the figure: 1-valve body 10-stopper sleeve 11-valve cover 12-valve cover sealing ring 13-dust cover 2-valve seat 20-first copper sleeve 21-spring 22-stepped upper surface 3-valve sleeve 30-second copper sleeve 4-valve core 40-gasket 5-junction box 50-box body 51-circuit board 52-socket 53-indicator light 520-pin 6-coil 60-coil sealing ring 7-valve stem 70-Y-type sealing ring 8-locating pin DETAILED DESCRIPTION

[0014] To more clearly illustrate the purpose, technical solutions, and advantages of the embodiments of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments, and will be described clearly and completely. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention. In addition, the directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", etc., are only references to the directions of the attached drawings. The directional terms used are for better and clearer illustration and understanding of the present invention, rather than indicating or implying the orientation that the present invention must have. Therefore, it cannot be understood as a limitation to the present invention.

[0015] The embodiments of the present invention are as follows Figure 1As shown in the figure, a solenoid valve includes a valve body 1, a valve seat 2, a valve sleeve 3 with a wall thickness of 2.0-3.0mm, and a valve core 4, all of which are ferromagnetic and have a cylindrical structure. The ferromagnetic properties will produce magnetic attraction and magnetization in the direction of magnetic force, such as pure iron DT4C material, and the cylindrical structure means that the two ends of each are connected, so that corresponding components can be installed inside each. The thickness of the valve sleeve 3 enables it to both release and transmit magnetism, and can easily introduce the magnetism of the valve body 1 and the coil 6. A junction box 5 is installed outside the valve body 1. The junction box 5 is used as a component connected to an external power supply to provide power to the solenoid valve. The valve body 1 is embedded with a ring electrically connected to the junction box 5. shaped coil 6, the valve sleeve 3 and the valve seat 2 are correspondingly installed at the upper and lower ends of the valve body 1 and are partially matched and embedded in the ring of the coil 6, and the relative surfaces of the valve sleeve 3 and the valve seat 2 do not contact each other, the valve core 4 is inserted into the valve sleeve 3 and can move relative to the valve seat 2 in the valve sleeve 3, and there is a gap with a width of 0.8-1.5mm between the valve core 4 and the valve sleeve 3. When the distance increases, the demagnetization will be accelerated, which increases the life of the product. When the distance is too small, the two will be attracted. Such a distance is convenient for the demagnetization and magnetization of the product, and can also make the movement of the valve core 4 smoother, and the magnetization effect will not be reduced due to the excessive distance. If the distance is too small, the two will be attracted and it is not conducive to the movement of the valve core 4. In this way, when the product's external dimensions are fixed, the copper wire with a diameter of 0.27-0.30mm on the coil 6 can be selected through the thickness of the valve sleeve 3 and the width of the gap between the valve sleeve 3 and the valve core 4, which can meet the corresponding functional requirements of the product. The valve core 4 is detachably connected with a valve stem 7 whose upper and lower ends extend out of the upper and lower ends of the valve body 1. Such a structure is, from the outside to the inside, the valve body 1, the coil 6, the valve sleeve 3 (located on the upper part of the coil) and the valve seat 2 (located on the lower part of the coil), the valve core 4, and the valve stem 7. The valve stem 7 is inserted into the valve core 4 and the valve seat 2, and the upper part passes through the valve core 4 and the lower part passes through the valve seat 2. The valve core 4 moves relative to the valve seat 2 to realize the opening and closing of the valve.In this way, the valve body 1, valve seat 2, valve sleeve 3 and valve core 4 are all ferromagnetic. After the coil 6 is energized, magnetic fields will be generated on both sides of the coil 6. The valve body 1 wraps around the outside of the coil 6. The valve sleeve 3 and valve seat 2 are both located inside the valve body 1 and the coil 6. The valve sleeve 3 and valve seat 2 attract the magnetic fields of the valve body 1 and the coil 6. The valve core 4 is located inside the valve sleeve 3 and attracts the magnetic field of the valve sleeve 3. At this time, the valve sleeve 3 and valve seat 2 do not touch inside the coil 6, that is, there is a certain distance between them, ensuring the occurrence of electromagnetic induction. At this time, the valve core 4 and valve seat 2 form the two poles of magnetic attraction. Under the interaction of the magnetic forces, the valve core 4 moves relative to the valve seat 2 in the valve sleeve 3 for suction and closing. The moving distance of the valve core 4 becomes the opening and closing stroke of this solenoid valve. According to the requirements of different strokes, the valve core 4 can pass through the lower end of the valve sleeve 3 or be a structure located inside the valve sleeve 3. In order to position the movement of the valve core 4, a positioning pin 8 for positioning the movement of the valve core 4 is provided on the inner wall of the valve body 1. Through the positioning pin 8, the movement of the valve core 4 is positioned, so that its movement is restricted within a certain range and moves in a certain direction. The positioning pin 8 is provided on the valve body 1. At this time, there is a corresponding positioning mechanism on the valve core 4 for the insertion of the positioning pin 8. This positioning mechanism can be a positioning groove provided on the valve core 4. The valve stem 7 is detachably connected to the valve core 4. The valve stem 7 slides with the valve core 4 to achieve the action of opening and closing the valve. Through the mutual magnetic attraction between them, the magnetic attraction is increased, and their respective magnetic fields are effectively utilized, thereby improving the opening and closing ability of the solenoid valve and enhancing the performance of the solenoid valve. The lower part of the valve stem 7 is hermetically connected to the valve seat 2 at the position corresponding to the bottom end of the valve seat 2 and elastically connected to the valve seat 2 at the position corresponding to the upper part of the valve seat 2. The valve of the product to be controlled is opened or closed by the expansion and contraction of the valve stem 7. In the embodiment, the length of the valve stem 7 passing through the valve seat 2 is 8 ± 0.10 mm, and the length after its movement and extension is 10.80 ± 0.10 mm. That is to say, its stroke is 2.80 mm. A magnetic isolation gasket 40 with a thickness of 0.05 - 0.1 mm is provided at the lower end of the valve core 4. Through the magnetic isolation gasket 40, the suction between the valve core 4 and the valve seat 2 is avoided. When the thickness of the gasket 40 is too thick, it will block the magnetic field, which is not conducive to magnetic attraction. When the gasket 40 is too thin, the valve core 4 and the valve seat 2 will be attracted. This thickness ensures that they will not be attracted together while not blocking the magnetic field.

[0016] Further improvement, such as Figure 1As shown, a ring-shaped first copper sleeve 20 is fitted and embedded in the upper part of the valve seat 2. The first copper sleeve 20 is sleeved outside the valve stem 7, and a spring 21 is also sleeved outside the valve stem 7. The two ends of the spring 21 are fixedly connected to the first copper sleeve 20 and the valve stem 7 respectively, which means that the first copper sleeve 20 is embedded on the opposite side walls of the valve seat 2 and the valve stem 7. On the one hand, it can prevent the valve seat 2 and the valve stem 7 from being attracted to each other under the magnetic force. On the other hand, it also avoids the frictional damage between the valve seat 2 and the valve stem 7. The copper sleeve is wear-resistant and will not be damaged during the friction with the valve stem 7, ensuring the service life of the product. The spring 21 is in a compressed state when the valve stem 7 moves relative to the valve seat 2. After the power is cut off, the magnetic attraction disappears, and the elastic force of the spring 21 will bounce the valve stem 7 back to its initial position. The valve stem 7 is hermetically connected to the valve seat 2 through a Y-shaped sealing ring 70 sleeved outside it. At this time, the valve stem 7 is used to control the opening and closing of the valve of the product to be controlled. In order to avoid damaging the solenoid valve after opening the product to be controlled, the Y-shaped sealing ring 70 is used to prevent the controlled fluid from entering the product, avoiding the damage of the product.

[0017] A further improvement is as Figure 1 As shown, a magnetic isolation gasket 40 is also provided at the upper end of the valve core 4. Coil sealing rings 60 are provided at both the upper and lower ends of the coil 6. A ring-shaped second copper sleeve 30 is embedded on the inner wall of the valve sleeve 3 between the valve sleeve 3 and the valve stem 7. The second copper sleeve 30 is sleeved on the outer wall of the valve stem 7. An external thread is provided on the valve stem 7, and an internal thread is provided inside the valve core 4. The valve stem 7 and the valve core 4 can be detachably connected through the cooperation of the internal and external threads. The threaded connection is convenient for disassembly and assembly, and it is also convenient to replace the valve stem 7 after it is damaged. A magnetic isolation gasket 40 is also provided at the upper end of the valve core 4. The gasket 40 plays a role in isolating magnetism, effectively preventing the valve core 4 from being attracted to the valve sleeve 3 or the valve seat 2 during the movement. At this time, in order to prevent the gasket 40 from being too thick to block magnetism or too thin to cause the problem of mutual attraction, the thickness of the gasket 40 is preferably 0.05 - 0.1 mm. Coil sealing rings 60 are provided at both the upper and lower ends of the coil 6, avoiding the damage to the coil 6 caused by the fluid entering the coil 6. A ring-shaped second copper sleeve 30 is embedded on the inner wall of the valve sleeve 3 between the valve sleeve 3 and the valve stem 7. The second copper sleeve 30 is sleeved on the outer wall of the valve stem 7, and similarly, it also avoids the damage to the valve sleeve 3 caused by the sliding of the valve stem 7.

[0018] A further improvement is as Figure 1As shown in the figure, the upper ends of the valve sleeve 3 and the valve body 1 are in the same plane. An annular retaining sleeve 10 covers the upper end of the valve sleeve 3. The upper end of the valve body 1 is connected with an annular valve cover 11 covering the upper end of the retaining sleeve 10. A valve cover sealing ring 12 is arranged between the valve cover 11 and the valve sleeve 3. A dust-proof cover 13 covering the top end of the valve rod 7 is installed between the retaining sleeve 10 and the valve cover 11. This facilitates the assembly of the product, avoids the entry of impurities, and ensures the smooth sliding of the valve rod 7.

[0019] Further improvement, as Figure 1 As shown in the figure, the valve body 1 is a cylindrical structure with an n-shaped vertical section. The valve seat 2 and the valve sleeve 3 are cylindrical structures with an inverted T-shaped and a T-shaped vertical section respectively. The upper end of the valve seat 2 is provided with a stepped upper surface 22. The thickness of the vertical part of the stepped upper surface 22 matches the thickness of the valve sleeve 3, and the thickness of the horizontal part matches the thickness of the valve core 4. With such a structure, the coil 6 is installed in the part covered by the upper part of the valve body 1 and will not be exposed. The two sides of the upper part of the valve sleeve 3 are then abutted against the upper ends of the coil 6 and the valve core 4, and the side of the valve seat 2 is abutted against the lower end of the coil 6. The structure is compact and can better achieve the function of attracting magnetism. The stepped upper surface 22 at the upper end of the valve seat 2 is to avoid the problem that the opening and closing force of the valve rod 7 sliding the solenoid valve is insufficient due to the excessive distance between the valve sleeve 3 and the valve seat 2 resulting in too weak magnetic attraction.

[0020] Further improvement, as Figure 1 and Figure 2 As shown in the figure, at least two cylindrical structures are arranged on the valve body 1 at intervals. Each cylindrical structure is internally provided with a coil 6, a valve seat 2, a valve sleeve 3 and a valve core 4. The junction box 5 includes a box body 50. A circuit board 51 electrically connected to the coil 6 is arranged in the box body 50, and a socket 52 arranged on the box body 50 and electrically connected to the circuit board 51. In this way, the opening and closing of several adjacent valves can be controlled by one solenoid valve, which is more convenient to use. An indicator light 53 electrically connected to the circuit board 51 is also arranged on the box body 50. Through the indication of the indicator light 53, the opening and closing states of each valve can be clearly known, so that the operation can be better carried out. A plurality of pins 520 electrically connected to the circuit board 51 are arranged on the socket 52. By conducting between different pins 520, the electrical conduction of different coils 6 can be controlled. As Figure 2 As shown in the figure, pin a is connected to a 12V DC power supply, pin d is used as a pin with a special function, and pins b and c are used to control different coils. When connecting pin a and pin b, the left coil is electrically conducted, and the corresponding indicator light 53 will be lit. When connecting pin a and c, the right coil is electrically conducted, and the corresponding indicator light 53 will also be lit. It is convenient to control, and the control state can also be visually monitored, making the application more convenient.

[0021] It should be understood that those of ordinary skill in the art can make improvements or modifications based on the above description, and all such improvements and modifications shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A solenoid valve, characterized in that: It includes a valve body, a valve seat, a valve sleeve with a wall thickness of 2.0 - 3.0 mm, and a valve core, all of which are cylindrical structures and have ferromagnetism. A junction box is installed outside the valve body. An annular coil electrically connected to the junction box is embedded in the valve body. The valve sleeve and the valve seat are correspondingly installed at the upper and lower ends of the valve body and are partially and fittingly embedded in the ring of the coil, and the opposite surfaces of the valve sleeve and the valve seat do not contact each other. The valve core is inserted into the valve sleeve and can move towards or away from the valve seat relative to the valve seat within the valve sleeve. A gap with a width of 0.8 - 1.5 mm is provided between the valve core and the valve sleeve. A valve rod with its upper and lower ends extending out of the upper and lower ends of the valve body is detachably connected within the valve core. The lower part of the valve rod is hermetically connected to the valve seat at a position corresponding to the bottom end of the valve seat and is elastically connected to the valve seat at a position corresponding to the upper part of the valve seat. A non-magnetic spacer with a thickness of 0.05 - 0.1 mm is provided at the lower end of the valve core; an annular first copper sleeve is fittingly and embedded in the upper part of the valve seat. The first copper sleeve is sleeved outside the valve rod, and a spring is also sleeved outside the valve rod. The two ends of the spring are fixedly connected to the first copper sleeve and the valve rod respectively. The valve rod is hermetically connected to the valve seat through a Y-shaped sealing ring sleeved on its outer part; positioning pins for positioning the movement of the valve core are provided on the inner wall of the valve body; at least two cylindrical structures are spaced apart on the valve body, and a coil, a valve seat, a valve sleeve, and a valve core are provided in each cylindrical structure. The junction box includes a box body. A circuit board electrically connected to the coil is provided in the box body, and a socket provided on the box body and electrically connected to the circuit board; a plurality of pins electrically connected to the circuit board are provided on the socket, and the electrical conduction of different coils is controlled by the conduction between different pins.

2. The solenoid valve according to claim 1, wherein: External threads are provided outside the valve rod, and internal threads are provided inside the valve core. The valve rod and the valve core are detachably connected through the cooperation of the internal and external threads. A non-magnetic spacer is also provided at the upper end of the valve core. Coil sealing rings are provided at the upper and lower ends of the coil. An annular second copper sleeve embedded on the inner wall of the valve sleeve is provided between the valve sleeve and the valve rod, and the second copper sleeve is sleeved on the outer wall of the valve rod.

3. The solenoid valve according to claim 1, wherein: The upper end of the valve sleeve and the valve body are in the same plane. An annular retaining sleeve covers the upper end of the valve sleeve. The upper end of the valve body is connected with an annular valve cover covering the upper end of the retaining sleeve. A valve cover sealing ring is provided between the valve cover and the valve sleeve. A dust cover covering the top end of the valve rod is installed between the retaining sleeve and the valve cover.

4. The solenoid valve according to claim 1, wherein: The valve body is a cylindrical structure with an n-shaped vertical section. The valve seat and the valve sleeve are cylindrical structures with an inverted T-shaped and T-shaped vertical section respectively. The upper end of the valve seat is provided with a stepped upper surface. The thickness of the vertical part of the stepped upper surface matches the thickness of the valve sleeve, and the thickness of the horizontal part matches the thickness of the valve core.

5. The solenoid valve according to claim 1, wherein: The copper wire diameter of the coil is 0.27 - 0.30 mm.

6. The solenoid valve according to claim 5, wherein: An indicator light electrically connected to the circuit board is also provided on the box body.

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