Electric valve

Abstract

An electric valve comprises an iron core assembly, a coil assembly and a permanent magnet. At least part of the permanent magnets are located on the outer side of the iron core assembly in the radial direction of the iron core assembly. The coil assembly comprises a coil winding, and at least part of the permanent magnets are located between the iron core assembly and the coil winding in the radial direction of the iron core assembly. The iron core assembly comprises a static iron core and a movable iron core, at least part of the coil winding is located on the outer side of the static iron core in the radial direction of the iron core assembly, and at least part of the coil winding is located on the outer side of the movable iron core; through the arrangement, the response speed of the electric valve can be improved.

Description

Technical Field

[0001] The present application relates to the field of fluid control technology, and in particular to an electric valve. Background Art

[0002] Electric valves are divided into normally open and normally closed electric valves. When opening or closing a normally open or normally closed electric valve, the coil needs to be energized to generate a magnetic field to drive the moving iron core and the static iron core to attract each other, and the moving iron core and the static iron core are separated by a reset spring. During this process, the electric valve responds slowly, so it is necessary to design an electric valve that is conducive to improving the response speed of the electric valve. Utility Model Content

[0003] The purpose of the present application is to provide an electric valve, which is conducive to improving the response speed of the electric valve.

[0004] To achieve the above purpose, an implementation method of the present application adopts the following technical solution:

[0005] An electric valve, comprising an iron core assembly, a coil assembly and a permanent magnet; along the radial direction of the iron core assembly, at least part of the permanent magnet is located on the outside of the iron core assembly; the coil assembly comprises a coil winding, and along the radial direction of the iron core assembly, at least part of the permanent magnet is located between the iron core assembly and the coil winding; the iron core assembly comprises a stationary iron core and a moving iron core, and along the radial direction of the iron core assembly, at least part of the coil winding is located on the outside of the stationary iron core, and at least part of the coil winding is located on the outside of the moving iron core.

[0006] In one embodiment provided by the present application, the coil assembly includes a permanent magnet, which is located outside the core assembly along the radial direction of the core assembly, and the coil assembly includes a coil winding, which is located between the core assembly and the coil winding along the radial direction of the core assembly, part of the coil winding is located outside the static core, and part of the coil winding is located outside the moving core;

[0007] In this arrangement, along the radial direction of the core assembly, part of the coil winding is located outside the static core, and part of the coil winding is located outside the moving core. Both the static core and the moving core are in a strong magnetic field generated by the excitation of the coil winding, which can enhance the attraction between the static core and the moving core.

[0008] The permanent magnet is located on the inner periphery of the coil winding. The closed-loop magnetic circuit of the permanent magnet on the core assembly has a high degree of overlap with the closed-loop magnetic circuit of the coil winding on the core assembly when power is supplied to the coil winding, which facilitates the coil winding to quickly change the magnetic field on the core assembly and is beneficial to improving the response speed of the electric valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a three-dimensional structural schematic diagram of the electric valve provided by the present application;

[0010] Figure 2 is a schematic cross-sectional structural diagram of a coil assembly in a first embodiment in which a stationary iron core and a moving iron core are kept separated;

[0011] Figure 3 It is a schematic diagram of the cross-sectional structure of the coil assembly with a forward current applied;

[0012] Figure 4 is a schematic cross-sectional view of the structure of the first embodiment of the coil assembly in which the static iron core and the moving iron core are kept in an attracted state;

[0013] Figure 5 It is a schematic cross-sectional structural diagram in which a reverse current is applied to the coil assembly, and the magnetic field applied by the coil assembly to the iron core assembly is smaller than the magnetic field applied by the permanent magnet to the iron core assembly;

[0014] Figure 6 It is a schematic cross-sectional structural diagram in which a reverse current is applied to the coil assembly, and the magnetic field applied by the coil assembly to the iron core assembly is greater than the magnetic field applied by the permanent magnet to the iron core assembly;

[0015] Figure 7 is a schematic cross-sectional structural diagram of a second embodiment of a coil assembly;

[0016] Figure 8 is a schematic cross-sectional structural diagram of a third embodiment of a coil assembly;

[0017] Fig. 9 It is a schematic diagram of the separate structures of the permanent magnet, the first magnetic conductor and the second magnetic conductor.

[0018] Reference numerals:

[0019] 1. Valve body; 10. Valve cavity; 100. Electric valve; 101. First valve cavity; 102. Second valve cavity; 11. First channel; 12. Second channel; 13. Valve port; 14. First port;

[0020] 2. Iron core assembly; 20. Static iron core; 21. Moving iron core; 22. Return spring;

[0021] 3. Piston assembly; 30. Piston; 31. Piston spring; 32. Pilot hole;

[0022] 4. cannula; 40. cannula cavity;

[0023] 5. Coil assembly; 50. Coil winding; 51. Skeleton; 510. Skeleton body; 511. First support portion; 512. Second support portion; 513. First magnetic conductor; 514. Second magnetic conductor; 52. Permanent magnet;

[0024] 6. Magnetic conductive frame; 60. Third magnetic conductive portion; 61. First magnetic conductive portion; 62. Second magnetic conductive portion. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0026] Combination Figures 1 to 7 As shown, a first embodiment of the electric valve 100 is illustrated. In this embodiment, the electric valve 100 includes a valve body 1, a core assembly 2, a piston assembly 3, a sleeve 4, and a coil assembly 5. The valve body 1 has a valve cavity 10, and the sleeve 4 has a sleeve cavity 40, wherein at least part of the piston assembly 3 is located in the valve cavity 10, at least part of the core assembly 2 is located above the piston assembly 3 and in the sleeve cavity 40, the coil assembly 5 is located above the valve body 1 and is sleeved on the outer periphery of the core assembly 2 and the sleeve 4, along the axial direction of the electric valve 100, part of the sleeve 4 is located between the coil assembly 5 and the valve body 1, the sleeve 4 is fixedly or limit-connected to the valve body 1 and sealed at the connection between the two, and in this embodiment, the sleeve 4 is welded to the valve body 1 to be fixed and sealed.

[0027] Combination Figure 2 and Figure 3 As shown, the valve body 1 includes a valve mouth portion 13, and the valve body 1 also has a first channel 11, a second channel 12 and a first port 14. The sleeve cavity 40 is connected to the valve cavity 10 through the first port 14, and the second channel 12 is connected to the valve cavity 10. The first channel 11 is located in the valve mouth portion 13 and can be connected to the valve cavity 10. Specifically, the first channel 11 is formed in the valve mouth portion 13, and the second channel 12 and the first port 14 are formed in the valve body 1.

[0028] Combination Figure 1 and Figure 3 As shown, at least part of the core assembly 2 is located above the piston assembly 3 and within the sleeve cavity 40. Specifically, the core assembly 2 includes a static core 20 and a moving core 21. At least part of the static core 20 is located within the sleeve cavity 40 and is fixed to the wall forming the sleeve cavity 40. The fixing method may be welding, riveting or interference fit. The moving core 21 can move axially within the sleeve cavity 40. In this embodiment, the moving core 21 is closer to the piston assembly 3 than the static core 20, or the static core 20 is located above the moving core 21. In other embodiments, the moving core 21 may be closer to the piston assembly 3 than the static core 20.

[0029] Combination Figures 2 to 8 As shown, the return spring 22 is used to drive the moving iron core 21 to separate from the static iron core 20, or in other words, the return spring 22 can keep the moving iron core 21 and the static iron core 20 in a separated state. Specifically, the return spring 22 is arranged between the static iron core 20 and the moving iron core 21, and along the axial direction of the core assembly 2, the two ends of the return spring 22 are respectively in contact with the static iron core 20 and the moving iron core 21.

[0030] Combination Figures 2 to 8As shown, the coil assembly 5 is sleeved on the outer periphery of the core assembly 2 and part of the sleeve 4, and the coil assembly 5 includes a permanent magnet 52. Along the radial direction of the core assembly 2, the permanent magnet 52 is located on the outer side of the core assembly 2. Specifically, the permanent magnet 52 is an integrally formed cylindrical structure, and the permanent magnet 52 is made of neodymium iron boron material; in this embodiment, along the radial direction of the core assembly 2, part of the permanent magnet 52 is located on the outer side of the static iron core 20, and part of the permanent magnet 52 is located on the outer side of the moving iron core 21. Specifically, part of the static iron core 20 is located inside the sleeve cavity 40, and the static iron core 20 and the sleeve cavity 40 are interference fit, and welding or a wall is provided between the static iron core 20 and the wall forming the sleeve cavity 40. A sealing ring is placed to achieve a sealed connection; the permanent magnet 52 is sleeved on the outside of part of the static iron core 20 and part of the sleeve 4; in the embodiment, the permanent magnet 52 is gap-matched with the static iron core 20, and the permanent magnet 52 is gap-matched with the sleeve 4, which is convenient for installing or replacing the permanent magnet 52; of course, in other embodiments, the static iron core 20 and the moving iron core 21 can be both located in the sleeve cavity 40, and along the radial direction of the core assembly 2, the permanent magnet 52 is located on the outside of the static iron core 20, specifically, the permanent magnet 52 is sleeved on the outside of the sleeve 4 or the static iron core 20, or, along the radial direction of the core assembly 2, the permanent magnet 52 is located on the outside of the moving iron core 21, specifically, the permanent magnet 52 is sleeved on the outside of the sleeve 4.

[0031] Combination Figures 2 to 8 As shown, the coil assembly 5 also includes a coil winding 50. Along the radial direction of the core assembly 2, the coil winding 50 is located on the outside of the permanent magnet 52, part of the coil winding 50 is located on the outside of the static iron core 20, and part of the coil winding 50 is located on the outside of the moving iron core 21. Specifically, the coil assembly 5 also includes a skeleton 51. The skeleton 51 is an annular structure. The skeleton 51 includes a skeleton body 510. Along the radial direction of the core assembly 2, the coil winding 50 is located on the outside of the skeleton body 510. The coil assembly 5 is sleeved on the outside of the sleeve 4 and the static iron core 20, and the coil winding 50 is located on the outside of the static iron core 20 and part of the moving iron core 21.

[0032] Under the premise that the magnetic field strength generated by the coil winding 50 is determined, the greater the magnetic field strength at the positions where the static iron core 20 and the moving iron core 21 are located, the greater the attraction force between the static iron core 20 and the moving iron core 21;

[0033] Along the radial direction of the core assembly, part of the coil winding 50 is located outside the static core 20, and part of the coil winding 50 is located outside the moving core. The static core 20 and the moving core 21 are both located at positions where a strong magnetic field generated by the energized coil winding 50 is excited, which can enhance the attraction between the static core 20 and the moving core 21, thereby facilitating an improvement in the response speed of the electric valve 100 when it is attracted.

[0034] Since part of the permanent magnet 52 is located outside the static iron core 20 and part of the permanent magnet 52 is located outside the moving iron core 21 along the radial direction of the iron core assembly 2, when a positive current is passed through the coil winding 50, the coil winding 50 is excited to generate a magnetic field in the same direction as the magnetic field of the permanent magnet 52, and the magnetic field generated by the coil winding 50 is positively superimposed on the magnetic field generated by the permanent magnet 52, and the static iron core 20 and the moving iron core 21 are attracted; when a reverse current is passed through the coil winding 50, the coil winding 50 is excited to generate a magnetic field in the opposite direction to the magnetic field of the permanent magnet 52, and the magnetic field generated by the coil winding 50 is offset by the magnetic field generated by the permanent magnet, and the static iron core 20 and the moving iron core 21 are separated;

[0035] In addition, since the permanent magnet 52 is located between the core assembly 2 and the coil winding 50 along the radial direction of the core assembly 2, the closed-loop magnetic circuit of the permanent magnet 52 on the core assembly 2 and the closed-loop magnetic circuit of the coil winding 50 on the core assembly 2 when power is supplied to the coil winding 50 have a high degree of overlap. When forward current and reverse current are passed through the coil winding 50, the magnetic field on the core assembly 2 can be quickly changed, which is beneficial to improving the response speed of the electric valve 100.

[0036] Combination Figures 2 to 8As shown, the skeleton 51 also includes a first magnetizer 513 and a second magnetizer 514. The first magnetizer 513 and the second magnetizer 514 are used to reduce magnetic resistance. Specifically, the first magnetizer 513 and the second magnetizer 514 are both made of magnetic conductive materials. In this embodiment, the first magnetizer 513 and the second magnetizer 514 are both made of low-carbon steel soft magnetic material. The first magnetizer 513 is located at one end of the permanent magnet 52. Along the radial direction of the core assembly 2, the first magnetizer 513 The first magnet 513 is located outside the static iron core 20, the second magnet 514 is located at the other end of the permanent magnet 52, and along the radial direction of the iron core assembly 2, the first magnet 513 is located outside the moving iron core 21; the first magnet 513 guides the magnetic force of the permanent magnet 52 to the static iron core 20, and the second magnet 514 guides the magnetic force of the permanent magnet 52 to the moving iron core 21. In other words, the first magnet 513 is used to reduce the magnetic resistance between the permanent magnet 52 and the static iron core 20, and the second magnet 514 is used to reduce the magnetic resistance between the permanent magnet 52 and the static iron core 20. The magnetic resistance between the body 52 and the moving iron core 21; specifically, the first magnetic conductor 513 and the second magnetic conductor 514 are both annular structures, the first magnetic conductor 513 is in contact with one end of the permanent magnet 52, and the second magnetic conductor 514 is in contact with the other end of the permanent magnet 52. The first magnetic conductor 513 is sleeved on the outside of the static iron core 20 or the sleeve 4, and the first magnetic conductor 513 is in clearance fit with the static iron core 20 or the sleeve 4; the second magnetic conductor 514 is sleeved on the outside of the sleeve 4, and, The second magnetic conductor is loosely fitted with the sleeve 4; the inner wall of the permanent magnet 52 abuts against at least part of the outer wall of the sleeve 4, which helps to shorten the magnetic circuit between the permanent magnet 52 and the static iron core 20 or the moving iron core 21; the inner wall of the first magnetic conductor 513 abuts against the side wall of the static iron core 20, which helps to reduce the magnetic resistance between the second magnetic conductor 514 and the static iron core 20; the second magnetic conductor 514 abuts against the side wall of the sleeve 4, which helps to reduce the magnetic resistance between the second magnetic conductor 514 and the moving iron core 21.

[0037] Combination Figures 2 to 8 As shown, the electric valve 100 also includes a magnetic conductive frame 6, a skeleton 51 and the magnetic conductive frame 6 are clamped and fixed, the skeleton 51 and the magnetic conductive frame 6 are both provided with corresponding through holes, and the through holes of the skeleton 51 are coaxially arranged with the through holes of the magnetic conductive frame 6, at least part of the core assembly 2 and the sleeve 4 are located in the through holes of the skeleton 51 and the magnetic conductive frame 6; specifically, the magnetic conductive frame 6 includes a first magnetic conductive portion 61 and a second magnetic conductive portion 62, the first magnetic conductive portion 61 is located at one end of the static iron core 20 away from the moving iron core 21, or the first magnetic conductive portion 61 is located in the circumference of the static iron core 20; the second magnetic conductive portion 62 is located in the circumference of the moving iron core 21; in the present embodiment, the first magnetic conductive portion 61 is in contact with one end of the static iron core 20 away from the moving iron core 21, the second magnetic conductive portion 62 is sleeved on the outside of the sleeve 4, and the second magnetic conductive portion 62 is gap-matched with the sleeve 4, of course, in other embodiments, the first magnetic conductive portion 61 can also be sleeved on the outside of the static iron core 20;

[0038] The magnetic conductive frame 6 also includes a third magnetic conductive portion 60, and the first magnetic conductive portion 61 and the second magnetic conductive portion 62 are connected through the third magnetic conductive portion 60. Specifically, the first magnetic conductive portion 61, the second magnetic conductive portion 62 and the third magnetic conductive portion 60 are fixed, limited or integrated structures, and the third magnetic conductive body 60 is used to reduce the magnetic resistance between the first magnetic conductive portion 61 and the second magnetic conductive portion 62; in this embodiment, the first magnetic conductive portion 61, the second magnetic conductive portion 62 and the third magnetic conductive portion 60 are an integrated structure, the third magnetic conductive portion 60 is parallel to the axis of the coil assembly 5, and the magnetic conductive frame 6 is a U-shaped structure. Of course, in other embodiments, any one of the first magnetic conductive portion 61 and the second magnetic conductive portion 62 is limitedly connected or welded to the third magnetic conductive portion 60, and the other is an integrated structure with the third magnetic conductive portion 60, or both the first magnetic conductive portion 61 and the second magnetic conductive portion 62 are limitedly connected or welded to the third magnetic conductive portion 60;

[0039] The provision of the magnetic conductive frame 6 helps to reduce the magnetic resistance in the magnetic circuit between the coil assembly 5 and the core assembly 2, helps to increase the speed of the magnetic force acting on the core assembly 2 by the coil assembly 5, and further helps to improve the response speed of the electric valve.

[0040] Along the axial direction of the coil assembly 5, the coil winding 50 is located between the first magnetic conductive part 61 and the second magnetic conductive part 62; specifically, the coil winding 50 is wound around the outside of the skeleton body 510, and the skeleton body 510 is clamped between the first magnetic conductive part 61 and the second magnetic conductive part 62, and the outer diameter of the coil winding 50 is smaller than the distance between the third magnetic conductive part 60 and the outer wall of the sleeve 4.

[0041] Combination Figures 2 to 6 As shown, along the axial direction of the permanent magnet 52, the first magnet 513 and the first magnetic conductive part 61 are spaced apart to avoid the magnetic circuits of the two being connected, and the second magnet 514 and the second magnetic conductive part 62 are spaced apart to avoid the magnetic circuits of the two being connected; this helps to concentrate the magnetic force of the permanent magnet 52 on the core assembly 2, shorten the magnetic circuit between the permanent magnet 52 and the core assembly 2, and thereby increase the magnetic force action speed of the permanent magnet 52 on the core assembly 2; the coil assembly 5 includes a skeleton body 510, the skeleton body 510 has a accommodating cavity 53, the permanent magnet 52, the second magnet 514 and the second magnetic conductive part 62 are all located in the accommodating cavity 53, the first magnet 513 is fixedly arranged relative to the skeleton body 510, and the second magnet 514 is fixedly arranged relative to the skeleton body 510.

[0042] Combination Figures 2 to 6As shown in the figure, in the first embodiment of the coil assembly 5, the coil assembly 5 also includes a first support portion 511 and a second support portion 512, and the first support portion 511 and the second support portion 512 are both made of magnetic isolation material; the first support portion 511 is used to support and fix the first magnetic conductor 513, and is used to disconnect the closed-loop magnetic circuit between the first magnetic conductor 61 and the first magnetic conductor 513, and the second support portion 512 is used to support and fix the second magnetic conductor 514, and is used to disconnect the closed-loop magnetic circuit between the second magnetic conductor 62 and the second magnetic conductor 514, which helps to concentrate the magnetic force of the permanent magnet 52 on the core assembly 2, shorten the magnetic circuit between the permanent magnet 52 and the core assembly 2, and thereby increase the magnetic force action speed of the permanent magnet 52 on the core assembly 2; specifically, the first support portion 511, the second support portion 512 and the skeleton body 510 are all made of high-temperature resistant plastics, such as polyvinyl fluoride (PVF) and other materials, and along the axial direction of the permanent magnet 52, one end of the first support portion 511 is aligned with the first conductor The magnet 513 is abutted, the other end of the first support part 511 is abutted with the first magnetic conductive part 61, or the other end of the first support part 511 is fixed to the skeleton body 510, limited connection or an integrated structure; one end of the second support part 512 is abutted with the second magnetic conductive part 514, the other end of the second support part 512 is abutted with the second magnetic conductive part 62, or the other end of the second support part 512 is fixed to the skeleton body 510, limited connection or an integrated structure; specifically, in a specific embodiment, one end of the first support part 511 is abutted with the first magnetic conductive part 513, the other end of the first support part 511 is abutted with the first magnetic conductive part 61, one end of the second support part 512 is abutted with the second magnetic conductive part 514, and the other end of the second support part 512 is abutted with the second magnetic conductive part 62, along the axial direction of the coil assembly 5, the first magnetic conductive part 513, the permanent magnet 52 and the second magnetic conductive part 514 are clamped between the first support part 511 and the second support part 512;

[0043] Combination Figure 7 and Fig. 9 As shown, of course, in the second embodiment of the coil assembly 5, the first support portion 511 and the second support portion 512 can also be an integrated structure with the skeleton body 510, and the first magnetic conductor 513, the permanent magnet 52 and the second magnetic conductor 514 are all annular structures composed of multiple arched structural parts. Along the axial direction of the coil assembly 5, the first magnetic conductor 513, the permanent magnet 52 and the second magnetic conductor 514 are clamped between the first support portion 511 and the second support portion 512.

[0044] Combination Figure 8As shown, the third embodiment of the coil assembly 5, specifically, the first magnetic conductor 513 and the second magnetic conductor 514 are fixed to the skeleton body 510, limitedly connected or integrated. In a specific embodiment, the first magnetic conductor 513 and the second magnetic conductor 514 are embedded in the wall forming the accommodating cavity 53, and the first magnetic conductor 513, the second magnetic conductor 514 and the permanent magnet 52 are injection-molded and fixed to the wall forming the accommodating cavity 53, which is conducive to reducing the assembly steps, and the permanent magnet 52 is clamped between the first magnetic conductor 513 and the second magnetic conductor 514;

[0045] Combination Figure 8 As shown, of course, in the third embodiment of the coil assembly 5, the first magnet 513 and the second magnet 514 can be fixed to the skeleton body 510 by injection molding, which is beneficial to reduce the assembly steps. The permanent magnet 52 is annular, and the permanent magnet 52 includes at least two permanent magnet pieces 520. The permanent magnet pieces 520 are arched, and multiple permanent magnet pieces 520 are combined to form a permanent magnet 52 with an annular structure. Along the axial direction of the permanent magnet 52, the permanent magnet piece 520 is clamped between the first magnet 513 and the second magnet 514. The coil assembly 5 is sleeved on the outside of the sleeve 4 and part of the core assembly 2. Along the radial direction of the core assembly 2, the permanent magnet piece 520 is located between the core assembly 2 and the coil winding 50. The setting of the permanent magnet piece 520 facilitates the replacement of the permanent magnet piece 52, and thus facilitates the maintenance of the electric valve 100.

[0046] Combination Figure 4 As shown, in the specific working process, a positive current is passed through the coil assembly 5, the magnetic fields of the coil assembly 5 and the permanent magnet 52 are superimposed, the magnetic force between the static iron core 20 and the moving iron core 21 increases, the moving iron core 21 moves toward the static iron core 20, the static iron core 20 and the moving iron core 21 are attracted, and the return spring 22 is compressed;

[0047] Combination Figure 3 As shown, the forward current inside the coil assembly 5 disappears, and the magnetic field applied by the permanent magnet 52 to the static iron core 20 and the moving iron core 21 keeps the static iron core 20 and the moving iron core 21 in an attracted state;

[0048] Combination Figure 5 As shown, a reverse current is passed through the coil assembly 5, and the magnetic field directions of the coil assembly 5 and the permanent magnet 52 are opposite. As the reverse current gradually increases, the magnetic force between the static iron core 20 and the moving iron core 21 gradually decreases;

[0049] Combination Figure 6As shown, until the reverse magnetic field generated by the coil assembly 5 is greater than the forward magnetic field generated by the permanent magnet 52, the polarity of the static iron core 20 and the moving iron core 21 are changed. Since part of the permanent magnet 52 is located outside the static iron core 20 and part of the permanent magnet 52 is located outside the moving iron core 21 along the radial direction of the iron core assembly 2, the end of the permanent magnet 52 away from the static iron core 20 generates an attractive force on the moving iron core 21. Under the gravitational force between the return spring 22, the permanent magnet 52 and the moving iron core 21, the static iron core 20 and the moving iron core 21 are accelerated to separate;

[0050] Combination Figure 2 As shown, as the reverse current disappears, the moving iron core 21 remains separated from the stationary iron core 20 under the elastic force of the return spring 22 .

[0051] Combination Figure 2 and Figure 3 As shown, the piston assembly 3 includes a piston 30. Along the axial direction of the valve body 1, the piston 30 can slide in the valve cavity 10. Specifically, the piston 30 cooperates with the wall gap forming the valve cavity 10. Along the axial direction of the piston 30, the piston 30 divides the valve cavity 10 into a first valve cavity 101 and a second valve cavity 102. The sleeve cavity 40 is connected to the first valve cavity 101 through the first port 14, and the first channel 11 and the second channel 12 are both connected to the second valve cavity 102.

[0052] Combination Figure 2 and Figure 3 As shown, the piston assembly 3 also includes a piston spring 31. Along the axial direction of the piston assembly 3, one end of the piston spring 31 abuts against the piston 30, and the other end of the piston spring 31 abuts against the wall forming the second valve cavity 102. Specifically, the bottom of the other end of the piston spring 31 abuts against the bottom wall forming the second valve cavity 102, and the outer ring side of the other end of the piston spring 31 abuts against the bottom side wall forming the second valve cavity 102.

[0053] Combination Figure 2 and Figure 3 As shown, further, a pilot hole 32 is opened on the piston 30, and the first valve chamber 101 and the second valve chamber 102 can be connected through the pilot hole 32;

[0054] Combination Figure 2 and Figure 3As shown, in a specific embodiment, when the static iron core 20 and the moving iron core 21 are attracted, the piston 30 is separated from the valve mouth portion 13, and the working medium can enter the second valve chamber 102 from the second channel 12 and enter the first valve chamber 101 through the pilot hole 32, and the working medium can enter the second valve chamber 102 from the second channel 12 and flow out from the first channel 11; then, when the static iron core 20 and the moving iron core 21 are separated, the moving iron core 21 closes the pilot hole 32, and the moving iron core 21 pushes the piston 30 to abut against the valve mouth portion 13, the piston 30 closes the first channel 11, and the working medium enters the first valve chamber 101 through the gap between the piston 30 and the wall forming the valve chamber 10, and the working medium applies pressure directed to the valve mouth portion 13 to the piston 30, and the piston 30 further closes the first channel 11.

[0055] Of course, in other embodiments, the moving iron core 21 can be fixed, limit-connected or integrated with the piston 30. When the static iron core 20 and the moving iron core 21 are attracted or separated, the moving iron core 21 can drive the piston 30 to move axially along the electric valve 100 in the valve cavity 102 through the moving iron core 21 to abut or separate from the valve mouth 13 to open or close the first channel 11. In other embodiments, the working medium can enter the valve cavity 10 from the second channel 12, and when the piston 30 leaves the valve mouth 13, the working medium flows out from the first channel 11.

[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this description.

[0057] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that those skilled in the art can still modify or make equivalent substitutions to the present invention, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An electric valve, characterized in that: The electric valve (100) comprises an iron core component (2), a coil component (5) and a permanent magnet (52); Along the radial direction of the core component (2), at least part of the permanent magnets (52) are located outside the core component (2); The coil assembly (5) comprises a coil winding (50), and along the radial direction of the iron core assembly (2), at least part of the permanent magnet (52) is located between the iron core assembly (2) and the coil winding (50); The core assembly (2) comprises a stationary core (20) and a moving core (21); along the radial direction of the core assembly (2), at least part of the coil winding (50) is located outside the stationary core (20), and at least part of the coil winding (50) is located outside the moving core (21).

2. The electric valve according to claim 1, characterized in that: Along the radial direction of the iron core assembly (2), at least part of the permanent magnets (52) are located outside the stationary iron core (20), and at least part of the permanent magnets (52) are located outside the moving iron core (21).

3. The electric valve according to claim 1 or 2, characterized in that: The coil assembly (5) comprises a first magnetic conductor (513) and a second magnetic conductor (514), wherein the first magnetic conductor (513) is located at one end of the permanent magnet (52), and the second magnetic conductor (514) is located at the other end of the permanent magnet (52); along the radial direction of the core assembly (2), the first magnetic conductor (513) is located on the outside of the static core (20), and the second magnetic conductor (514) is located on the outside of the moving core (21).

4. The electric valve according to claim 3, characterized in that: The electric valve (100) further comprises a magnetic conductive frame (6), wherein the magnetic conductive frame (6) comprises a first magnetic conductive portion (61) and a second magnetic conductive portion (62), wherein the first magnetic conductive portion (61) is located at an end of the static iron core (20) away from the moving iron core (21), or the first magnetic conductive portion (61) is located in the circumference of the static iron core (20); and the second magnetic conductive portion (62) is located in the circumference of the moving iron core (21); Along the axial direction of the coil assembly (5), the coil winding (50) is located between the first magnetic conductive portion (61) and the second magnetic conductive portion (62); The magnetic conductive frame (6) further comprises a third magnetic conductive portion (60), and the first magnetic conductive portion (61) and the second magnetic conductive portion (62) are connected via the third magnetic conductive portion (60).

5. The electric valve according to claim 4, characterized in that: Along the axial direction of the permanent magnet (52), the first magnetic conductor (513) and the first magnetic conductor part (61) are arranged at intervals, and the second magnetic conductor (514) and the second magnetic conductor part (62) are arranged at intervals; Along the axial direction of the permanent magnet (52), one end of the permanent magnet (52) abuts against the first magnetic conductor (513), and the other end of the permanent magnet (52) abuts against the second magnetic conductor (514); The coil assembly (5) includes a skeleton body (510), the skeleton body (510) has a receiving cavity (53), the permanent magnet (52), the second magnetic conductor (514) and the second magnetic conductor part (62) are all located in the receiving cavity (53), the first magnetic conductor (513) is fixed relative to the skeleton body (510), and the second magnetic conductor (514) is fixed relative to the skeleton body (510).

6. The electric valve according to claim 5, characterized in that: The coil assembly (5) further comprises a first supporting portion (511) and a second supporting portion (512); Along the axial direction of the permanent magnet (52), one end of the first support portion (511) abuts against the first magnetic conductor (513), and the other end of the first support portion (511) abuts against the first magnetic conductor (61); One end of the second support portion (512) abuts against the second magnetic conductor (514), and the other end of the second support portion (512) abuts against the second magnetic conductor (62).

7. The electric valve according to claim 6, characterized in that: The first supporting portion (511) is used to disconnect the closed-loop magnetic circuit between the first magnetic conductive portion (61) and the first magnetic conductive body (513), and the second supporting portion (512) is used to disconnect the closed-loop magnetic circuit between the second magnetic conductive portion (62) and the second magnetic conductive body (514); The first supporting portion (511) and the second supporting portion (512) are both made of magnetic isolation material.

8. The electric valve according to claim 5, characterized in that: The first magnetic conductor (513) and the second magnetic conductor (514) are both fixed to the wall forming the accommodating cavity (53) by injection molding.

9. The electric valve according to claim 3, characterized in that: The permanent magnet (52) is annular and comprises at least two permanent magnet pieces (520). The permanent magnet pieces (520) are arched and are located on the outside of the core assembly (2) along the radial direction of the core assembly (2). The permanent magnet pieces (520) are clamped between the first magnetic conductor (513) and the second magnetic conductor (514).

10. The electric valve according to any one of claims 4 to 8, characterized in that: The permanent magnet (52) is annular and comprises at least two permanent magnet pieces (520). The permanent magnet pieces (520) are arched and are located on the outside of the core assembly (2) along the radial direction of the core assembly (2). The permanent magnet pieces (520) are clamped between the first magnetic conductor (513) and the second magnetic conductor (514).

11. The electric valve according to claim 3, characterized in that: The electric valve (100) comprises a sleeve (4), the sleeve (4) having a sleeve cavity (40), the moving iron core (21) being located in the sleeve cavity (40), and at least a portion of the stationary iron core (20) being located in the sleeve cavity (40); The inner wall of the permanent magnet (52) abuts against at least part of the outer wall of the sleeve (4), the inner wall of the first magnetic conductor (513) abuts against the outer wall of the static iron core (20), and the second magnetic conductor (514) abuts against the outer wall of the sleeve (4).

12. The electric valve according to any one of claims 4 to 9, characterized in that: The electric valve (100) comprises a sleeve (4), the sleeve (4) having a sleeve cavity (40), the moving iron core (21) being located in the sleeve cavity (40), and at least a portion of the stationary iron core (20) being located in the sleeve cavity (40); The inner wall of the permanent magnet (52) abuts against at least part of the outer wall of the sleeve (4), the inner wall of the first magnetic conductor (513) abuts against the outer wall of the static iron core (20), and the second magnetic conductor (514) abuts against the outer wall of the sleeve (4).

13. The electric valve according to claim 10, characterized in that: The electric valve (100) comprises a sleeve (4), the sleeve (4) having a sleeve cavity (40), the moving iron core (21) being located in the sleeve cavity (40), and at least a portion of the stationary iron core (20) being located in the sleeve cavity (40); The inner wall of the permanent magnet (52) abuts against at least part of the outer wall of the sleeve (4), the inner wall of the first magnetic conductor (513) abuts against the outer wall of the static iron core (20), and the second magnetic conductor (514) abuts against the outer wall of the sleeve (4).

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