Electromagnetic valve

Abstract

The utility model discloses an electromagnetic valve which comprises a valve body, a coil assembly and a clamping plate, the valve body comprises an inlet, an outlet and an internal flow channel used for liquid to flow to the outlet along the inlet, and a cavity wall is arranged at the top of the valve body. A first opening axially extending to the top of the cavity wall and a second opening communicating with the bottom of the first opening and extending in the circumferential direction of the cavity wall are formed in the inner side of the cavity wall, and a third opening is formed in the outer side of the cavity wall; the coil assembly comprises a positioning pin and a movable iron core assembly, the positioning pin is arranged on the periphery of the bottom of the coil assembly, the positioning pin can move along the first opening and be screwed into the second opening so that the coil assembly can be connected to the valve body, and the movable iron core assembly can axially move so as to control on-off of the internal flow channel; the clamping plate comprises a clamping plate body, a first clamping piece and a second clamping piece, the first clamping piece and the second clamping piece are connected to the same side of the clamping plate body, the first clamping piece can be inserted into the first opening, the second clamping piece is used for being connected with the third opening in a clamped mode, and material brittle cracking caused by connection of all components through screws is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, in particular to a solenoid valve. Background Art

[0002] The miniaturized solenoid valves for water purifiers commonly found on the market use screws to connect various components. The brittle material often causes cracking when screwing, and the coil skeleton needs to make way for the screws, making assembly complicated. The coil drive adopts soldering processing technology, and the soldering structure has certain quality risks. The product will have cold solder joints during welding, leading to failure during normal use. The sealing ring of the static iron core has high requirements on size and is not easy to process. Adding limit grooves can avoid the risk of water leakage, but the manufacturing cost is high and it is difficult to promote in large quantities.

[0003] Therefore, how to provide a solenoid valve to at least partially solve the above-mentioned drawbacks is a technical problem that those skilled in the art currently need to solve. Utility Model Content

[0004] The purpose of the utility model is to provide a solenoid valve, which avoids the problem of brittle cracking of materials caused by connecting various components by screws, and at the same time will not cause falling off and failure during transportation or use, thereby ensuring structural reliability.

[0005] To achieve the above object, the utility model provides a solenoid valve, comprising:

[0006] The valve body includes an inlet, an outlet, and an internal flow channel for liquid to flow from the inlet to the outlet. The top of the valve body is provided with a cavity wall. The inner side of the cavity wall is provided with a first opening extending axially to the top of the cavity wall, and a second opening connected to the bottom of the first opening and extending circumferentially along the cavity wall. The outer side of the cavity wall is provided with a third opening.

[0007] The coil assembly includes a positioning foot and a movable iron core assembly. The positioning foot is provided on the outer periphery of the bottom of the coil assembly. The positioning foot can move along the first opening and screw into the second opening to connect the coil assembly to the valve body. The movable iron core assembly can move axially into the internal flow channel to control the internal flow channel to be open or closed.

[0008] The card plate includes a card plate body, a first card member and a second card member connected to the same side of the card plate body. The first card member can be inserted into the first opening to limit the rotation of the positioning foot, and the second card member is used to be connected with the third opening.

[0009] Preferably, the moving iron core assembly includes a moving iron core and an elastic member connected to the moving iron core;

[0010] The coil assembly also includes a plastic shell, a coil frame and a static iron core. The coil frame is located inside the plastic shell. The outer circumference of the coil frame is wrapped with enameled wire. An axially extending receiving groove is provided inside the coil frame. The inner wall of the receiving groove is provided with a limiting portion so that the receiving groove forms an upper mounting groove for fixing the static iron core and a lower guide groove for directional movement of the moving iron core. The elastic part abuts against the side of the limiting portion facing the lower guide groove. The static iron core generates magnetism through the enameled wire to magnetically attract the moving iron core and compress the elastic part.

[0011] Preferably, the coil assembly further comprises two lead pieces, the two lead pieces are clamped to the same side of the plastic package, and the lead pieces are spot-welded to the enameled wire.

[0012] Preferably, an extension portion is provided at one end of the static iron core facing the moving iron core, the extension portion is passed through the limiting portion and extends into the lower guide groove, a first sealing ring is provided between the side of the limiting portion facing the upper mounting groove and the static iron core, and the first sealing ring is sleeved on the outer periphery of the extension portion.

[0013] Preferably, the lead sheet includes a sheet body and lead pins connected to the sheet body, and the angle between the sheet body and the lead pins is 72°-78°.

[0014] Preferably, a sealing cover and a diaphragm assembly are provided in the valve body to form an internal flow channel;

[0015] The sealing cover is provided with an upper chamber, a lower chamber, a pressure relief passage, a through hole for connecting the upper chamber and the lower chamber, and a pressure relief hole for connecting the upper chamber and the pressure relief passage;

[0016] The diaphragm assembly comprises a diaphragm pressed under the sealing cover and a diaphragm frame assembled on the side of the diaphragm facing the lower chamber. The diaphragm frame is provided with a pressure-increasing hole extending to the other side of the diaphragm to communicate with the inlet and the lower chamber.

[0017] Preferably, the valve body is further provided with a fluid channel connected to the outlet and the pressure relief channel;

[0018] The moving iron core assembly also includes a rubber plug connected to the bottom of the moving iron core. The rubber plug can move to the sealed pressure relief hole to form high pressure in the upper chamber, and is used to press the diaphragm to the top of the inner wall of the inlet with the liquid in the lower chamber to limit the liquid from flowing along the bottom of the diaphragm to the outlet.

[0019] Preferably, a second sealing ring is provided between the sealing cover and the valve body, and a third sealing ring is provided between the sealing cover and the coil skeleton.

[0020] Preferably, the inlet and the outlet are both arranged at the bottom of the valve body, and a filter screen for filtering liquid is provided in the inlet.

[0021] Compared with the above-mentioned background technology, the solenoid valve provided by the present invention includes a valve body, a coil assembly and a clamping plate. The valve body includes an inlet, an outlet, and an internal flow channel for liquid to flow from the inlet to the outlet. A cavity wall is provided on the top of the valve body, and the inner side of the cavity wall is provided with a first opening extending axially to the top of the cavity wall, and a second opening connected to the bottom of the first opening and extending circumferentially along the cavity wall. A third opening is provided on the outer side of the cavity wall; the coil assembly includes a positioning foot and a moving iron core assembly, the positioning foot is provided at the bottom periphery of the coil assembly, the positioning foot can move along the first opening and be screwed into the second opening to connect the coil assembly to the valve body, and the moving iron core assembly can move axially into the internal flow channel to control the opening and closing of the internal flow channel; the clamping plate includes a clamping plate body, a first clamping member and a second clamping member connected to the same side of the clamping plate body, the first clamping member can be inserted into the first opening to limit the rotation of the positioning foot, and the second clamping member is used to clamp with the third opening.

[0022] Specifically, by moving the positioning foot along the first opening and screwing it into the second opening, the coil assembly is screwed into the cavity wall at the top of the valve body, and the moving iron core assembly can move axially into the internal flow channel to control the opening and closing of the internal flow channel. The first clamp of the clamping plate is inserted into the first opening to limit the rotation of the positioning foot, so that the coil assembly and the valve body are relatively fixed. The second clamp of the clamping plate is engaged with the third opening opened on the outside of the cavity wall to achieve relative fixation of the valve body, the coil assembly and the clamping plate. The valve body is locked by screwing in and is firmly sealed, avoiding the problem of brittle cracking of the material caused by connecting the components with screws. At the same time, the clamping plate will not fall off and fail during transportation or use, thereby ensuring structural reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 A schematic structural diagram of a solenoid valve provided in an embodiment of the present utility model;

[0025] Figure 2 A cross-sectional view of a solenoid valve provided by an embodiment of the present utility model;

[0026] Figure 3 A schematic structural diagram of a valve body provided in an embodiment of the present utility model;

[0027] Figure 4 A schematic structural diagram of a valve body from another perspective provided by an embodiment of the present utility model;

[0028] Figure 5 A schematic structural diagram of a coil assembly provided in an embodiment of the present utility model;

[0029] Figure 6 A schematic structural diagram of a card board provided in an embodiment of the present utility model;

[0030] Figure 7 A schematic diagram of the disassembly of the coil assembly provided in an embodiment of the present utility model;

[0031] Figure 8 A schematic structural diagram of a lead sheet provided in an embodiment of the present utility model;

[0032] Figure 9 A schematic structural diagram of a sealing cover provided in an embodiment of the present utility model;

[0033] Figure 10 A cross-sectional view of a sealing cover provided by an embodiment of the present utility model;

[0034] Figure 11 This is a schematic structural diagram of the diaphragm assembly provided in an embodiment of the present utility model.

[0035] in:

[0036] 100 - valve body, 110 - inlet, 111 - filter screen, 120 - outlet, 130 - cavity wall, 131 - first opening, 132 - second opening, 133 - third opening, 140 - fluid channel, 150 - fourth sealing ring;

[0037] 200-coil assembly, 210-positioning foot, 221-moving iron core, 222-elastic member, 223-rubber plug, 230-plastic package, 240-coil skeleton, 250-static iron core, 260-enameled wire, 270-limiting part, 280-lead sheet, 281-sheet body, 282-lead foot, 290-first sealing ring;

[0038] 300-card board, 310-card board body, 320-first card component, 330-second card component;

[0039] 400-sealing cover, 410-upper chamber, 420-lower chamber, 430-pressure relief channel, 440-through hole, 450-pressure relief hole, 460-second sealing ring, 470-third sealing ring;

[0040] 510-diaphragm, 520-diaphragm frame, 521-boost hole. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0043] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limitations of the present invention.

[0044] The purpose of the utility model is to provide a solenoid valve, which avoids the problem of brittle cracking of materials caused by connecting various components by screws, and at the same time will not cause falling off and failure during transportation or use, thereby ensuring structural reliability.

[0045] See also Figures 1 to 6 To achieve the above-mentioned objectives, the present invention provides a solenoid valve, including a valve body 100, a coil assembly 200 and a clamping plate 300. The valve body 100 includes an inlet 110, an outlet 120, and an internal flow channel for liquid to flow from the inlet 110 to the outlet 120. A cavity wall 130 is provided at the top of the valve body 100. The inner side of the cavity wall 130 is provided with a first opening 131 extending axially to the top of the cavity wall 130, and a second opening 132 connected to the bottom of the first opening 131 and extending circumferentially along the cavity wall 130. A third opening 133 is provided on the outer side of the cavity wall 130. The coil assembly 200 includes a positioning foot 210 and a moving iron core 221 assembly. The positioning foot 210 is arranged on the bottom periphery of the coil assembly 200. The positioning foot 210 can move along the first opening 131 and screw into the second opening 132 to connect the coil assembly 200 to the valve body 100. The moving iron core 221 assembly can move axially into the internal flow channel to control the opening and closing of the internal flow channel; the clamping plate 300 includes a clamping plate body 310, a first clamping member 320 and a second clamping member 330 connected to the same side of the clamping plate body 310. The first clamping member 320 can be inserted into the first opening 131 to limit the rotation of the positioning foot 210, and the second clamping member 330 is used to clamp with the third opening 133.

[0046] Among them, the number of the first opening 131, the second opening 132, and the positioning feet 210 corresponds to each other. The coil assembly 200 is moved downward, so that the three positioning feet 210 enter the corresponding first opening 131 at the same time. When the positioning feet 210 enter to a preset depth, the coil assembly 200 and the valve body 100 rotate relative to each other, so that the positioning feet 210 enter the corresponding second opening 132. After rotating to the extreme position, the first clamping member 320 of the clamping plate 300 is inserted into the corresponding first opening 131 to prevent the coil assembly 200 from rotating. Among them, the size of the positioning foot 210 matches the size of the corresponding second opening 132, so that after the positioning foot 210 is screwed into the second opening 132, there is no obvious gap in the second opening 132. At the same time, the end of the positioning foot 210 facing the first opening 131 should be located at the edge of the first opening 131, so that after the first clamping member 320 adapted to the first opening 131 is inserted into the first opening 131, one side wall of the first clamping member 320 abuts against the positioning foot 210.

[0047] In addition, the three first openings 131 can be set to different depths, and the three second openings 132 can be set to different heights, so that the positioning feet 210 on the coil assembly 200 have a plurality of different height matching relationships with the valve body 100, avoiding the setting of all the second openings 132 on the same layer, which causes the structural strength of the layer to be weakened. In order to improve the stability after the positioning foot 210 is screwed into the second opening 132, the end faces on both sides of the positioning angle can be set as a first abutment slope and a second abutment slope. The first abutment slope and the second abutment slope are respectively located at the front end and the rear end in the rotation direction of the positioning foot 210. The side wall of the second opening 132 includes a third abutment slope that can be fitted with the first abutment slope, and the side wall of the first clamp 320 includes a fourth abutment slope that can be fitted with the second abutment slope. In this way, it can be ensured that after the positioning foot 210 is screwed in, the clamping plate 300 fixes the coil assembly 200 and the valve body 100.

[0048] In some embodiments, a groove or a protrusion is provided at the top and / or bottom of the second opening 132. For example, when a groove is provided at both the top and the bottom of the second opening 132, a protrusion adapted to the groove is provided on the positioning foot 210, so that the positioning foot 210 moves along the extension direction of the groove within the second opening 132, thereby avoiding radial movement of the positioning foot 210 relative to the second opening 132; when a protrusion is provided at both the top and the bottom of the second opening 132, a groove adapted to the protrusion is provided on the positioning foot 210, which has the same effect as described above and will not be repeated here.

[0049] By moving the positioning foot 210 along the first opening 131 and screwing it into the second opening 132, the coil assembly 200 is screwed into the cavity wall 130 at the top of the valve body 100, and the moving iron core assembly can move axially into the internal flow channel to control the opening and closing of the internal flow channel. The first clamping member 320 of the clamping plate 300 is inserted into the first opening 131 to limit the rotation of the positioning foot 210, so that the coil assembly 200 and the valve body 100 are relatively fixed. The second clamping member 330 of the clamping plate 300 is engaged with the third opening 133 opened on the outside of the cavity wall 130 to achieve relative fixation of the valve body 100, the coil assembly 200 and the clamping plate 300. The valve body 100 is locked by screwing in, and is firmly sealed, avoiding the problem of brittle cracking of the material caused by connecting the components by screws. At the same time, the clamping plate 300 will not fall off and fail during transportation or use, thereby ensuring structural reliability.

[0050] In this embodiment, the moving iron core assembly includes a moving iron core 221 and an elastic member 222 connected to the moving iron core 221, and a rubber plug 223 is also provided at the bottom of the moving iron core 221; the coil assembly 200 also includes a plastic shell 230, a coil skeleton 240 and a static iron core 250. The above-mentioned positioning feet 210 can be arranged on the bottom periphery of the plastic shell 230 and are consistent with the position of the corresponding second opening 132. The plastic shell 230 can prevent the external environment from damaging the internal components. At the same time, the positioning feet 210 are provided, the screw structure is eliminated, and the area of ​​the solenoid valve body 100 is reduced. The solenoid valve is rigidly assembled by two plastic parts (plastic shell 230 and clamping plate 300), so that the solenoid valve is reliably sealed and can withstand high pressure.

[0051] The coil skeleton 240 is located in the plastic shell 230, and the outer circumference of the coil skeleton 240 is wrapped with an enameled wire 260. An axially extending receiving groove is provided inside the coil skeleton 240, and a limiting portion 270 is provided on the inner wall of the receiving groove so that the receiving groove forms an upper mounting groove for fixing the static iron core 250 and a lower guide groove for directional movement of the moving iron core 221. The elastic member 222 abuts against the side of the limiting portion 270 facing the lower guide groove. The static iron core 250 is energized through the enameled wire 260 to generate magnetism, thereby magnetically attracting the moving iron core 221 and compressing the elastic member 222. The static iron core 250, the moving iron core 221, the coil skeleton 240, and the enameled wire 260 are arranged in an integrated manner in the plastic shell 230. The assembly is convenient and quick, the integrated structure has high starting performance, a small size and low material cost, and fewer assembly steps, which can realize automated processing.

[0052] Among them, the upper mounting groove is located at the upper end of the coil skeleton 240, and the lower guide groove is located at the lower end of the coil skeleton 240. After the static iron core 250 is installed and fixed to the upper mounting groove, it is used to generate magnetic force when the enameled wire 260 is energized, thereby driving the moving iron core 221 to move along the extension direction of the lower guide groove. Specifically, when the enameled wire 260 is not energized, the moving iron core 221 moves downward under the action of the elastic member 222, and the rubber plug 223 at the bottom of the moving iron core 221 extends into the internal flow channel of the valve body 100 to control the internal flow channel to be closed. When the enameled wire 260 is energized, the static iron core 250 generates magnetic force, causing the moving iron core 221 to overcome the elastic force of the elastic part 222 and move upward, compressing the elastic part 222, and the rubber plug 223 at the bottom of the moving iron core 221 moves upward synchronously, and the internal flow channel opens; when the power is cut off again, the moving iron core 221 continues to recover to the state of closing the internal flow channel under the drive of the compressed elastic part 222. The static iron core 250 adopts a columnar iron structure, which is conducive to the effective conduction of the magnetic field and ensures that the solenoid valve responds quickly.

[0053] See also Figure 7 and Figure 8 It should be noted that the coil assembly 200 also includes two lead pieces 280, which are snapped onto the same side of the plastic package 230. The lead piece 280 is spot-welded to the enameled wire 260 and is connected to the external circuit through the lead piece 280 to ensure that the current can smoothly pass through the enameled wire 260 to generate an electromagnetic field. The lead piece 280 includes a sheet body 281 and a lead pin 282 connected to the sheet body 281. The lead piece 280 uses a spot welding process instead of a conventional tinning process. To achieve the spot welding process, the winding angle of the lead piece 280 is thickened to increase the winding area. The angle between the sheet body 281 and the lead pin 282 is 72°-78°, and the angle between the sheet body 281 and the lead pin 282 is preferably 75°. The angle of the lead pin 282 is changed from the original 90° to 75°, and the terminal pre-stressing and bending process is added to facilitate automation.

[0054] In order to enable the moving iron core 221 to respond faster when the static iron core 250 generates magnetic force, an extension portion is provided at one end of the static iron core 250 facing the moving iron core 221. The extension portion is passed through the limiting portion 270 and extends into the lower guide groove to reduce the distance between the static iron core 250 and the moving iron core 221 on the axis of the coil skeleton 240 when the enameled wire 260 is not energized. A first sealing ring 290 is provided between the limiting portion 270 on one side facing the upper mounting groove and the static iron core 250, and the first sealing ring 290 is sleeved on the outer periphery of the extension portion, thereby avoiding the risk of water leakage and the problem of higher manufacturing cost caused by adding the limiting groove.

[0055] See also Figure 9 、 Figure 10 and Figure 11In this embodiment, a sealing cover 400 and a diaphragm assembly are provided in the valve body 100 to form the above-mentioned internal flow channel, and the sealing cover 400 is tightly fitted to the above-mentioned plastic shell 230; the sealing cover 400 is provided with an upper chamber 410, a lower chamber 420, a pressure relief channel 430, a through hole 440 for connecting the upper chamber 410 and the lower chamber 420, and a pressure relief hole 450 for connecting the upper chamber 410 and the pressure relief channel 430; the diaphragm assembly includes a diaphragm 510 pressed under the sealing cover 400, and a diaphragm frame 520 assembled on the side of the diaphragm 510 facing the lower chamber 420, the diaphragm frame 520 is provided with a boost hole 521 extending to the other side of the diaphragm 510 to connect with the inlet 110 and the lower chamber 420, and the valve body 100 is further provided with a fluid channel 140 connected with the outlet 120 and the pressure relief channel 430.

[0056] The valve body 100 is the load-bearing and supporting structure of the solenoid valve, and is also the core control element of the internal channel. It plays multiple roles such as guiding, supporting, sealing, and controlling, and is an important guarantee for the normal operation of the solenoid valve. The sealing cover 400 closes the working area of ​​the solenoid valve, ensuring that the interior of the valve body 100 is isolated from the outside world to prevent external contaminants from entering, and provides a pressure relief channel 430 to control the pressure difference between the inside and outside of the valve cavity, realize the movement of the diaphragm 510, and achieve the function of opening and closing the solenoid valve. The diaphragm 510 is installed at the bottom of the solenoid valve to control the flow of fluid. The diaphragm frame 520 is used to fix the diaphragm 510 to ensure that it maintains a stable working state in the solenoid valve. A boost hole 521 is also provided on the diaphragm frame 520 to control the opening and closing of the solenoid valve. The pressure relief hole 450 and the boost hole 521 are isolated and arranged up and down to improve the starting performance; the pressure relief channel 430 in the sealing cover 400 is connected to the fluid channel 140 on the valve body 100 to form a pressure relief flow channel.

[0057] Specifically, when the enameled wire 260 is not energized, the rubber plug 223 at the bottom of the moving iron core 221 moves down to the sealed pressure relief hole 450, so that high pressure is formed in the upper chamber 410, and at the same time, the liquid pressure in the lower chamber 420 is higher than the liquid pressure on the side of the diaphragm 510 away from the lower chamber 420, so that the liquid in the lower chamber 420 presses the diaphragm 510 to the top of the inner wall of the inlet 110 to limit the liquid from flowing along the bottom of the diaphragm 510 to the outlet 120; when the enameled wire 260 is energized, the moving iron core 221 and the rubber plug 223 move up synchronously, and the liquid in the upper chamber 410 enters the pressure relief channel 430 along the pressure relief hole 450, and flows out into the outlet 120 along the fluid channel 140, and the liquid pressure in the upper chamber 410 is less than the liquid pressure in the lower chamber 420, and the liquid pressure in the lower chamber 420 is greater than the liquid pressure in the lower chamber 420. The liquid pressure is less than the liquid pressure on the side of the diaphragm 510 away from the lower chamber 420, so that the liquid pushes the diaphragm 510 to move upward or deform, causing most of the liquid to flow out from the inlet 110 along the side of the diaphragm 510 away from the lower chamber 420 to the outlet 120, while a small amount of liquid flows through the boost hole 521, the lower chamber 420, the through hole 440, the upper chamber 410, the pressure relief hole 450, the pressure relief channel 430, and the fluid channel 140 in sequence to the outlet 120. When the enameled wire 260 is powered off again, the rubber plug 223 at the bottom of the moving iron core 221 moves down to the sealed pressure relief hole 450. After the liquid enters the upper chamber 410, it cannot flow out along the pressure relief hole 450. The upper chamber 410 forms high pressure again, and the above process is repeated to press the diaphragm 510 to the top of the inner wall of the inlet 110 to achieve flow interruption.

[0058] Changing the pilot structure to an indirect pilot structure reduces the requirement for suction, avoids the need for movement of the pilot sealing component, and causes a longer movement stroke; adopts a sealing cover 400 structure with small water inlet, ensures the minimum stamping speed while ensuring the consistency of pressure reduction and pressure increase, and reduces the requirement for suction; the elastic member 222 is specifically a spring, and the plug 223 is specifically a rubber plug 223. The rubber core is installed under the moving iron core 221 to play a role of buffering and sealing, effectively preventing direct collision between the moving iron core 221 and the sealing cover 400, while enhancing the sealing performance.

[0059] It should be noted that a second sealing ring 460 is provided between the sealing cover 400 and the valve body 100, a third sealing ring 470 is provided between the sealing cover 400 and the coil skeleton 240, and a fourth sealing ring 150 is provided on the outer wall of the inlet 110 and the outlet 120 for sealing connection between the inlet 110 and the outlet 120 and the external pipeline. The first sealing ring 290, the second sealing ring 460, the third sealing ring 470 and the fourth sealing ring 150 are all O-rings and are respectively located at different sealing nodes to ensure that the solenoid valve can effectively prevent fluid leakage in the working state, forming multiple Sealing system, the inlet 110 and the outlet 120 are both arranged at the bottom of the valve body 100, and the axes of the inlet 110 and the outlet 120 are parallel to each other. The inlet 110 for liquid entry and the outlet 120 for liquid outflow are arranged on the same side, which is convenient for the installation of the waterway board of the whole machine and reduces the volume. A filter screen 111 for filtering the liquid is provided in the inlet 110. The filter screen 111 is made of plastic. The plastic filter screen 111 is installed in the inlet 110 at the bottom of the valve body 100 to filter impurities in the fluid entering the solenoid valve, prevent impurities from damaging the valve body 100, and extend the service life of the solenoid valve.

[0060] In addition, a preparation method is also included for preparing the above-mentioned solenoid valve, including: winding an enameled wire 260 in a coil skeleton 240; assembling a first sealing ring 290 at the bottom of the static iron core 250, forming a closed channel in the middle of the coil skeleton 240 to ensure that the seal is leak-proof, and burying the static iron core 250 in the coil skeleton 240; plastic-sealing the coil skeleton 240 so that the static iron core 250 is fixed on the top of the coil skeleton 240; assembling the moving iron core assembly at the bottom of the coil skeleton 240 to form a coil assembly 200; assembling the coil assembly 200 into a valve body 100 equipped with a sealing cover 400 and a diaphragm assembly; and assembling the clamping plate 300 to the cavity wall 130 of the valve body 100 to form a solenoid valve.

[0061] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0062] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0063] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A solenoid valve, characterized in that: include: A valve body comprising an inlet, an outlet, and an internal flow passage for liquid to flow from the inlet to the outlet, wherein a cavity wall is provided on the top of the valve body, a first opening extending axially to the top of the cavity wall is provided on the inner side of the cavity wall, and a second opening connected to the bottom of the first opening and extending circumferentially along the cavity wall is provided, and a third opening is provided on the outer side of the cavity wall; The coil assembly includes a positioning foot and a movable iron core assembly, wherein the positioning foot is provided on the outer periphery of the bottom of the coil assembly, the positioning foot can move along the first opening and screw into the second opening to connect the coil assembly to the valve body, and the movable iron core assembly can move axially into the internal flow channel to control the opening and closing of the internal flow channel; The card plate includes a card plate body, a first card member and a second card member connected to the same side of the card plate body, the first card member can be inserted into the first opening to limit the rotation of the positioning foot, and the second card member is used to engage with the third opening.

2. The solenoid valve according to claim 1, characterized in that The moving iron core assembly includes a moving iron core and an elastic member connected to the moving iron core; The coil assembly also includes a plastic shell, a coil frame and a static iron core. The coil frame is located in the plastic shell, and an enameled wire is wound around the outer circumference of the coil frame. An axially extending receiving groove is provided inside the coil frame, and a limiting portion is provided on the inner wall of the receiving groove so that the receiving groove forms an upper mounting groove for fixing the static iron core and a lower guide groove for directional movement of the moving iron core. The elastic member abuts against the side of the limiting portion toward the lower guide groove, and the static iron core generates magnetism by energizing the enameled wire to magnetically attract the moving iron core and compress the elastic member.

3. The solenoid valve according to claim 2, characterized in that The coil assembly further comprises two lead pieces, which are clamped on the same side of the plastic package shell, and the lead pieces are spot-welded to the enameled wire.

4. The solenoid valve according to claim 2, characterized in that An extension portion is provided at one end of the static iron core facing the moving iron core, and the extension portion is passed through the limiting portion and extends into the lower guide groove. A first sealing ring is provided between the side of the limiting portion facing the upper mounting groove and the static iron core, and the first sealing ring is sleeved on the outer periphery of the extension portion.

5. The solenoid valve according to claim 3, characterized in that The lead sheet includes a sheet body and lead pins connected to the sheet body, and the angle between the sheet body and the lead pins is 72°-78°.

6. The solenoid valve according to claim 2, characterized in that A sealing cover and a diaphragm assembly are provided in the valve body to form the internal flow channel; The sealing cover is provided with an upper chamber, a lower chamber, a pressure relief channel, a through hole for connecting the upper chamber and the lower chamber, and a pressure relief hole for connecting the upper chamber and the pressure relief channel; The diaphragm assembly includes a diaphragm pressed under the sealing cover and a diaphragm frame assembled on the side of the diaphragm facing the lower chamber. The diaphragm frame is provided with a boost hole extending to the other side of the diaphragm to connect with the inlet and the lower chamber.

7. The solenoid valve according to claim 6, characterized in that The valve body is further provided with a fluid passage communicating with the outlet and the pressure relief passage; The moving iron core assembly also includes a rubber plug connected to the bottom of the moving iron core, which can be moved to seal the pressure relief hole to form a high pressure in the upper chamber, and is used to press the liquid in the lower chamber to the top of the inner wall of the inlet to limit the liquid from flowing along the bottom of the diaphragm to the outlet.

8. The solenoid valve according to claim 6, characterized in that A second sealing ring is provided between the sealing cover and the valve body, and a third sealing ring is provided between the sealing cover and the coil skeleton.

9. The solenoid valve according to any one of claims 1 to 8, characterized in that: The inlet and the outlet are both arranged at the bottom of the valve body, and a filter for filtering liquid is provided in the inlet.

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