Direct-acting solenoid valve and method of assembling the same

Abstract

The application relates to a direct-acting electromagnetic valve and an assembling method thereof, the direct-acting electromagnetic valve comprising an electromagnetic assembly and a valve body assembly, the electromagnetic assembly comprising a shell, a circuit board, a circuit board protection cover, an inner support, a coil framework, an electromagnetic coil, two wiring terminals, a static iron core, a moving iron core, a moving iron core spring and a coil cover; two lead wires of the electromagnetic coil are respectively electrically connected with the two wiring terminals, and the two wiring terminals are inserted and welded on the circuit board. In the application, the two lead wires of the electromagnetic coil are respectively electrically connected with the two wiring terminals, then the circuit board is inserted into the two wiring terminals in an inserted mode, and the electrical connection between the lead wires and the circuit board is completed; since the circuit board does not need to be turned over to weld the lead wires, the lead wires do not need to be designed to be relatively long, the wiring is more neat, the lead wires do not need to be wound from the side of the circuit board, and the situation that the insulating paint on the lead wires is abraded does not exist, so the technical problems in the prior art are well solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic valves, in particular to a direct-acting electromagnetic valve and an assembling method thereof. BACKGROUND

[0002] The direct-acting electromagnetic valve refers to an electromagnetic valve in which a moving iron core and a valve shaft are on the same axis. The direct-acting electromagnetic valve comprises an electromagnetic assembly and a valve body assembly. The electromagnetic assembly further comprises a shell, a circuit board, a circuit board protection cover, an internal support, a coil framework, an electromagnetic coil, a static iron core, a moving iron core, a moving iron core spring and a coil cover. The circuit board is arranged outside the shell. The two ends of the electromagnetic coil need to be welded to the circuit board. If the welding is performed on the back of the circuit board, the circuit board needs to be turned over first. After the welding is completed, the circuit board is turned back. As a result, a relatively long lead needs to be arranged, and the wiring is not neat. If the welding is performed on the front of the circuit board, the lead needs to be wound from the side of the circuit board. The side of the circuit board is prone to scratching the lead and damaging the insulating paint on the surface of the lead, which poses a complete hidden danger and needs to be improved. SUMMARY

[0003] In order to solve the technical problems of the existing electromagnetic coil that the two ends of the lead are not neat after being welded to the circuit board or pose a complete hidden danger, the present application provides a direct-acting electromagnetic valve and an assembling method thereof.

[0004] In one aspect, the present application provides a direct-acting electromagnetic valve adopting the following technical scheme: a direct-acting electromagnetic valve comprising an electromagnetic assembly and a valve body assembly, wherein the electromagnetic assembly is fixed on the valve body assembly by screws; the electromagnetic assembly comprises a shell, a circuit board, a circuit board protection cover, an internal support, a coil framework, an electromagnetic coil, two wire terminals, a static iron core, a moving iron core, a moving iron core spring and a coil cover; the shell is arranged outside the internal support, the coil framework is fixedly arranged between the internal support and the coil cover, and the internal support and the coil cover are fixed by welding; two terminal fixing holes are arranged on the coil framework, and the two wire terminals are arranged in the two terminal fixing holes, respectively; the electromagnetic coil is wound on the coil framework, and the two leads of the electromagnetic coil are electrically connected to the two wire terminals, respectively; the circuit board is arranged outside the shell, the two wire terminals are inserted and welded on the circuit board, the circuit board protection cover is fixed on the shell, and the circuit board protection cover is used for covering and protecting the circuit board; the static iron core and the moving iron core are located in the inner cavity of the coil framework, the static iron core is screwed on the internal support, and the moving iron core is slidingly arranged in the inner cavity of the coil framework; one end of the moving iron core protrudes from the coil cover, and an axial shoulder is arranged at the end protruding from the coil cover; the moving iron core spring is sleeved on the moving iron core, one end of the moving iron core spring abuts against the axial shoulder, and the other end of the moving iron core spring abuts against the outer end face of the coil cover.

[0005] By adopting the technical scheme, two terminal fixing holes are arranged on the coil framework, two connecting terminals are arranged in the two terminal fixing holes respectively, then two lead wires of the electromagnetic coil are electrically connected with the two connecting terminals respectively, then the circuit board is inserted to the two connecting terminals in a plug-in mode, then welding is performed to complete the electrical connection between the lead wires and the circuit board, since the circuit board does not need to be turned over to weld the lead wires, the lead wires do not need to be designed to be relatively long, the wiring is more neat, the lead wires do not need to be wound from the side surface of the circuit board, and the lead wires are not damaged by friction, so the technical problems in the prior art are solved.

[0006] Preferably, two side surfaces of the coil framework are further provided with wiring grooves for the lead wires of the electromagnetic coil.

[0007] By adopting the technical scheme, the wiring grooves have a limiting and protecting effect on the lead wires, can reduce the surface damage of the lead wires, and can make the wiring more neat.

[0008] Preferably, the lead wires of the electromagnetic coil are wound around the connecting terminals for multiple turns and are welded on the connecting terminals.

[0009] By adopting the technical scheme, the lead wires are wound around the connecting terminals for multiple turns and are welded, when the lead wires are accidentally pulled, the friction force between the multiple turns of the lead wires and the connecting terminals can partially or totally offset the pulling force, the lead wires are not easy to be detached from the welding, and the electrical connection is more reliable.

[0010] Preferably, a plurality of buckles are arranged on the shell, a plurality of buckle holes are arranged on the side surface of the circuit board protection cover, and the circuit board protection cover is clamped on the shell.

[0011] By adopting the technical scheme, the circuit board protection cover covers the circuit board, can play a protection role, the clamping mode is low in cost, and assembly is fast and convenient.

[0012] Preferably, a positioning column is arranged on the shell, a positioning notch is arranged at a corresponding position on the circuit board, and the positioning column is embedded in the positioning notch to position the circuit board on the shell.

[0013] By adopting the technical scheme, since the cross-sectional dimension of the connecting terminal is small, the fixing effect on the circuit board is poor, by arranging the positioning column on the shell and the positioning notch on the circuit board, the circuit board can be positioned on the shell, and the circuit board is mainly positioned, so that the positioning pressure of the connecting terminal on the circuit board is reduced.

[0014] Preferably, the valve body assembly includes a valve body, a valve shaft, a valve shaft spring, a reset button, and a valve shaft seat; the valve body has a valve cavity inside, the valve shaft seat is screwed onto the outer end of the valve cavity, the valve shaft is slidably disposed in the inner cavity of the valve shaft seat, and the reset button is slidably disposed on the outer end of the inner cavity of the valve shaft seat; the valve body sidewall has a first vent, a second vent, and a third vent; the valve cavity has a first sealing blade, the inner end of the valve shaft seat has a second sealing blade, the valve shaft has a first convex ring and a second convex ring, the first convex ring is fitted with an end face seal, the end face seal can contact the first sealing blade to close the passage between the first vent and the second vent, and the end face seal can also contact the second sealing blade to close the passage between the second vent and the third vent; the valve shaft spring is sleeved on the valve shaft, one end abutting against the side of the second convex ring, and the other end against the inner side of the reset button. The valve shaft spring is used for automatic reset of the valve shaft and reset button. The valve shaft is hollow to balance the air pressure at both ends. A first dynamic sealing ring is fitted on the reset button to achieve a sliding seal between the reset button and the valve shaft seat. An annular groove is provided on the second convex ring, and a second dynamic sealing ring is provided in the annular groove to achieve a sliding seal between the valve shaft and the valve shaft seat. A first sealing ring and a second sealing ring are fitted on the valve shaft seat. The first sealing ring is used to seal the valve body cavity from the outside, and the second sealing ring is used to seal the second vent and the third vent. A third sealing ring is fitted on the stationary iron core to seal the coil frame cavity from the outside. A fourth sealing ring and a fifth sealing ring are provided on the inner and outer sides of the coil cover. The fourth sealing ring is used to seal the coil frame and the coil cover, and the fifth sealing ring is used to seal the coil cover and the valve body.

[0015] By adopting the above technical solution, when the electromagnetic coil is energized, the stationary iron core attracts the moving iron core, the valve shaft spring pushes the valve shaft to move, the end face seal contacts the first sealing blade and separates from the second sealing blade, the first vent and the second vent are closed, and the second vent and the third vent are connected; when the electromagnetic coil is de-energized, the stationary iron core no longer attracts the moving iron core, the moving iron core spring pushes the valve shaft to move, the end face seal separates from the first sealing blade and contacts the second sealing blade, the first vent and the second vent are connected, and the second vent and the third vent are closed. By energizing and de-energizing the electromagnetic coil, the functions of closing and connecting the first and second vents, as well as the functions of closing and connecting the second and third vents, are realized.

[0016] Furthermore, because the valve shaft is hollow, the air pressure at both ends of the valve shaft is balanced, the valve shaft moves smoothly, and the force on both ends of the valve shaft is improved, resulting in better sealing between the end face seal and the first and second sealing blades.

[0017] Preferably, the outer peripheral surface of the first convex ring is shaped like a "Z" and the outer peripheral surface is also provided with a plurality of annular grooves, and the end face seal is provided with an annular protrusion that matches the annular grooves.

[0018] By adopting the above technical solution, the first convex ring in the shape of the letter Z can fix the end face seal well and prevent the end face seal from shifting in the axial direction during use. The annular groove on the outer circumference and the annular protrusion on the end face seal can also interlock with each other, which can also increase the stability of the axial position of the end face seal. In this way, the flow of the solenoid valve can be controlled more accurately.

[0019] Preferably, the valve shaft includes a first shaft and a second shaft, both of which have shaft holes. One end of the second shaft extends into the shaft hole of the first shaft and is riveted and sealed. The first convex ring is disposed on the first shaft, and the second convex ring is disposed on the second shaft.

[0020] By adopting the above technical solution, since the valve shaft is a slender rod with a hollow center, a small and long central hole needs to be machined, which is not conducive to machining. This application splits the valve shaft into a first shaft and a second shaft, and machines a first convex ring on the first shaft and a second convex ring on the second shaft. Machining them separately is easier and cheaper, and then they are riveted together, and the riveting point can maintain a seal.

[0021] Preferably, the inner end of the reset button is also provided with a plastic part, which, when in contact with the second shaft, cannot completely seal the shaft hole of the second shaft.

[0022] By adopting the above technical solution, when the reset button is pushed to move, the plastic part cannot completely seal the shaft hole of the second shaft, thus ensuring the air pressure balance at both ends of the valve shaft.

[0023] On the other hand, the assembly method of a direct-acting solenoid valve provided in this application adopts the following technical solution: An assembly method of the above-mentioned direct-acting solenoid valve includes the following steps: winding the solenoid coil around the coil frame, fixing two terminals in the two terminal fixing holes of the coil frame, and welding the two leads of the solenoid coil to the two terminals respectively; placing the internal bracket into the housing, installing the coil frame into the internal bracket, screwing the stationary iron core onto the internal bracket, and welding the coil cover to the internal bracket; inserting the circuit board into the two terminals and welding it; springing the moving iron core onto the moving iron core, and then installing the moving iron core into the coil frame; installing the solenoid assembly onto the valve body assembly with screws; and then installing the circuit board protective cover onto the housing.

[0024] By adopting the above technical solution, the assembly method described in this application first connects the two leads of the electromagnetic coil to two terminals respectively, then plugs the circuit board into the two terminals in a plug-in manner, and then solders them to complete the electrical connection between the leads and the circuit board. Since it is not necessary to flip the circuit board to solder the leads, the leads do not need to be designed to be long, the wiring is neater, and the leads do not need to be wound around the side of the circuit board, so there is no friction damage to the insulating paint on the leads. Therefore, the technical problems in the prior art are well solved.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. In this application, the two leads of the electromagnetic coil are electrically connected to two terminals respectively, and then the circuit board is plugged into the two terminals to complete the electrical connection between the leads and the circuit board. Since it is not necessary to flip the circuit board to solder the leads, the leads do not need to be designed to be long, the wiring is neater, and the leads do not need to be wound around the side of the circuit board, so there is no friction damage to the insulating paint on the leads. Therefore, the technical problems in the prior art are well solved.

[0027] 2. By energizing and de-energizing the electromagnetic coil, the functions of shutting off and connecting the first vent and the second vent, as well as the functions of shutting off and connecting the second vent and the third vent, are realized.

[0028] 3. Because the valve shaft is hollow, the air pressure at both ends of the valve shaft is balanced, the valve shaft moves smoothly, and the force at both ends of the valve shaft is improved, resulting in better sealing between the end face seal and the first and second sealing blades. Attached Figure Description

[0029] Figure 1 This is a perspective view of the direct-acting solenoid valve according to an embodiment of this application;

[0030] Figure 2 This is a perspective view of the direct-acting solenoid valve according to an embodiment of this application from another angle;

[0031] Figure 3 This is a half-sectional schematic diagram of the direct-acting solenoid valve according to an embodiment of this application (power off state).

[0032] Figure 4 yes Figure 3 A magnified view of a portion of the image;

[0033] Figure 5 This is a half-sectional schematic diagram of the direct-acting solenoid valve (in the engaged state) according to an embodiment of this application.

[0034] Figure 6 yes Figure 5 A magnified view of a portion of the image;

[0035] Figure 7This is a half-sectional schematic diagram of the valve shaft described in this application;

[0036] Figure 8 This is a schematic diagram showing the assembly of the terminals and electromagnetic coil onto the coil frame.

[0037] Figure 9 This is a schematic diagram illustrating the process of assembling the internal support frame onto the housing;

[0038] Figure 10 This is a schematic diagram illustrating the process of assembling components such as the coil frame onto the internal support.

[0039] Figure 11 This is a schematic diagram illustrating the process of assembling the coil cover onto the internal support.

[0040] Figure 12 This is a schematic diagram illustrating the process of assembling the stationary iron core onto the housing;

[0041] Figure 13 This is a schematic diagram illustrating the process of assembling the circuit board onto the housing and terminals;

[0042] Figure 14 This is a schematic diagram illustrating the process of assembling the moving iron core spring and the moving iron core onto the coil frame.

[0043] Figure 15 This is a schematic diagram showing the state of the electromagnetic components after assembly;

[0044] Figure 16 This is a schematic diagram illustrating the action of assembling the reset button onto the valve stem seat;

[0045] Figure 17 This is a schematic diagram illustrating the action of assembling the valve shaft and valve shaft spring onto the valve shaft seat.

[0046] Figure 18 This is a schematic diagram illustrating the process of assembling components such as the valve shaft and valve shaft seat onto the valve body.

[0047] Figure 19 This is a schematic diagram showing the state of the valve body assembly after it has been assembled.

[0048] Figure 20 This is a schematic diagram illustrating the action of assembling the electromagnetic component onto the valve body component using screws.

[0049] Figure 21 This is a schematic diagram illustrating the process of assembling the circuit board protective cover onto the housing.

[0050] Explanation of reference numerals in the attached drawings: 100, electromagnetic assembly; 200, valve body assembly; 300, screw;

[0051] 101. Housing; 1011. Snap-fit; 1012. Positioning pin; 102. Circuit board; 1021. Positioning notch; 103. Circuit board protective cover; 1031. Snap-fit ​​hole; 104. Internal support; 105. Coil frame; 1051. Terminal fixing hole; 1052. Wiring channel; 106. Electromagnetic coil; 107. Terminal block; 108. Stationary iron core; 1081. Third sealing ring; 109. Moving iron core; 1091. Shoulder; 110. Moving iron core spring; 111. Coil cover; 1111. Fourth sealing ring; 1112. Fifth sealing ring;

[0052] 201. Valve body; 2011. Valve cavity; 2012. First vent; 2013. Second vent; 2014. Third vent; 2015. First sealing edge; 202. Valve shaft; 2021. First convex ring; 20211. Annular groove; 2022. Second convex ring; 2023. End face seal; 20231. Annular protrusion; 2024. Annular groove; 2025. Second dynamic seal ring; 2026. First shaft; 2027. Second shaft; 203. Valve shaft spring; 204. Reset button; 2041. First dynamic seal ring; 2042. Plastic part; 205. Valve shaft seat; 2051. Second sealing edge; 2052. First seal ring; 2053. Second seal ring. Detailed Implementation

[0053] The following is in conjunction with the appendix Figures 1-21 This application will be described in further detail.

[0054] This application discloses a direct-acting solenoid valve, referring to... Figure 1 and Figure 2 It includes an electromagnetic component 100 and a valve body assembly 200, wherein the electromagnetic component 100 is fixed to the valve body assembly 200 by screws 300.

[0055] Reference Figure 3 and Figure 5The electromagnetic assembly 100 includes a housing 101, a circuit board 102, a circuit board protective cover 103, an internal support 104, a coil frame 105, an electromagnetic coil 106, two terminals 107, a stationary iron core 108, a moving iron core 109, a moving iron core spring 110, and a coil cover 111. The housing 101 is fitted over the internal support 104. The coil frame 105 is fixedly disposed between the internal support 104 and the coil cover 111, and the internal support 104 and the coil cover 111 are fixed by welding. The coil frame 105 has two terminal fixing holes 1051, and two terminals 107 are respectively disposed in the two terminal fixing holes 1051. The electromagnetic coil 106 is wound around the coil frame 105, and the two leads of the electromagnetic coil 106 are... Do not connect to the two terminals 107 electrically; the circuit board 102 is disposed outside the housing 101, the two terminals 107 are plugged into and soldered onto the circuit board 102, the circuit board protective cover 103 is fixed on the housing 101, used to cover and protect the circuit board 102; the stationary iron core 108 and the moving iron core 109 are both located in the inner cavity of the coil frame 105, the stationary iron core 108 is screwed onto the internal support 104, and the moving iron core 109 is slidably disposed in the inner cavity of the coil frame 105; one end of the moving iron core 109 extends beyond the coil cover 111, and the end extending beyond the coil cover 111 is provided with a shoulder 1091, the moving iron core spring 110 is sleeved on the moving iron core 109, one end abuts against the shoulder 1091, and the other end abuts against the outer end face of the coil cover 111.

[0056] Reference Figure 8 The coil frame 105 is also provided with wiring grooves 1052 on both sides for wiring of the electromagnetic coil 106. The wiring grooves 1052 have the function of limiting and protecting the wiring, reducing damage to the wiring surface, and making the wiring neater.

[0057] Reference Figure 8 The lead wire of the electromagnetic coil 106 is wound around the terminal 107 multiple times and then soldered to the terminal 107. By first winding the lead wire around the terminal 107 multiple times and then soldering it, the friction between the multiple turns of lead wire and the terminal 107 will partially or completely offset the pulling force when the lead wire is accidentally pulled, making it less likely for the lead wire to detach from the solder joint and the electrical connection more reliable.

[0058] Reference Figure 21 The housing 101 is provided with multiple buckles 1011, and the circuit board protective cover 103 is provided with multiple buckle holes 1031 on its side. The circuit board protective cover 103 is snapped onto the housing 101. The circuit board protective cover 103 covers the circuit board 102, which can play a protective role. The snap-fit ​​method is low cost and quick and convenient to assemble.

[0059] Reference Figure 13The housing 101 is provided with a positioning post 1012, and the circuit board 102 is provided with a positioning notch 1021 at a corresponding position. The positioning post 1012 is embedded into the positioning notch 1021, so that the circuit board 102 is positioned on the housing 101. Since the cross-sectional size of the terminal 107 is small, its fixing effect on the circuit board 102 is poor. By providing the positioning post 1012 on the housing 101 and the positioning notch 1021 on the circuit board 102, the circuit board 102 can be positioned on the housing 101, playing a major positioning role for the circuit board 102 and reducing the positioning pressure of the terminal 107 on the circuit board 102.

[0060] Reference Figure 3 and Figure 5The valve body assembly 200 includes a valve body 201, a valve shaft 202, a valve shaft spring 203, a reset button 204, and a valve shaft seat 205. The valve body 201 has a valve cavity 2011 inside. The valve shaft seat 205 is screwed onto the outer end of the valve cavity 2011. The valve shaft 202 is slidably disposed within the inner cavity of the valve shaft seat 205. The reset button 204 is slidably disposed at the outer end of the inner cavity of the valve shaft seat 205. The valve body 201 has a first vent 2012, a second vent 2013, and a third vent 2014 on its sidewall. The valve cavity 2011 has a first vent 2012, a second vent 2013, and a third vent 2014. A sealing blade 2015 is provided, and a second sealing blade 2051 is provided on the inner end of the valve shaft seat 205. A first convex ring 2021 and a second convex ring 2022 are provided on the valve shaft 202. An end face seal 2023 is sleeved on the first convex ring 2021. The end face seal 2023 can contact the first sealing blade 2015 to close the passage between the first vent 2012 and the second vent 2013. The end face seal 2023 can also contact the second sealing blade 2051 to close the passage between the second vent 2013 and the third vent 2014. The valve shaft spring 203 is sleeved on the valve shaft 202, with one end abutting against the side of the second convex ring 2022 and the other end abutting against the inner side of the reset button 204. The valve shaft spring 203 is used for automatic reset of the valve shaft 202 and the reset button 204. The valve shaft 202 is hollow to balance the air pressure at both ends of the valve shaft 202. A first dynamic sealing ring 2041 is sleeved on the reset button 204 to achieve a sliding seal between the reset button 204 and the valve shaft seat 205. An annular groove 2024 is provided on the second convex ring 2022, and a second dynamic sealing ring 2025 is provided in the annular groove 2024 to achieve a sliding seal between the valve shaft 202 and the valve shaft seat 205. A valve shaft seat 205 is sleeved on... A first sealing ring 2052 and a second sealing ring 2053 are provided. The first sealing ring 2052 is used to seal the inner cavity of the valve body 201 from the outside, and the second sealing ring 2053 is used to seal the second vent 2013 and the third vent 2014. A third sealing ring 1081 is sleeved on the stationary iron core 108 to seal the inner cavity of the coil frame 105 from the outside. A fourth sealing ring 1111 and a fifth sealing ring 1112 are provided on the inner and outer sides of the coil cover 111. The fourth sealing ring 1111 is used to seal the coil frame 105 and the coil cover 111, and the fifth sealing ring 1112 is used to seal the coil cover 111 and the valve body 201.

[0061] Reference Figure 7The outer circumferential surface of the first convex ring 2021 is shaped like a "Z" and also has multiple annular grooves 20211. The end face seal 2023 has corresponding annular protrusions 20231 that match the annular grooves 20211. The "Z"-shaped first convex ring 2021 can effectively fix the end face seal 2023, preventing the end face seal 2023 from shifting axially during use. The annular grooves 20211 on the outer circumferential surface and the annular protrusions 20231 on the end face seal 2023 interlock, which also increases the stability of the axial position of the end face seal 2023. This allows for more accurate control of the flow rate of the solenoid valve.

[0062] Reference Figure 7 The valve shaft 202 includes a first shaft 2026 and a second shaft 2027. Both the first shaft 2026 and the second shaft 2027 have shaft holes. One end of the second shaft 2027 extends into the shaft hole of the first shaft 2026 and is riveted and sealed. Since the valve shaft 202 is a slender rod with a hollow center, a small and long central hole needs to be machined, which is inconvenient for machining. This application disassembles the valve shaft 202 into a first shaft 2026 and a second shaft 2027. A first convex ring 2021 is machined on the first shaft 2026, and a second convex ring 2022 is machined on the second shaft 2027. Machining these separately is easier and less costly. Then, they are riveted together, and the riveting point maintains a seal.

[0063] Reference Figure 4 The inner end of the reset button 204 is also provided with a plastic part 2042. When the plastic part 2042 abuts against the second shaft 2027, it cannot completely seal the shaft hole of the second shaft 2027. In this way, when the reset button 204 is pushed to move, the plastic part 2042 cannot completely seal the shaft hole of the second shaft 2027, which can still ensure the air pressure balance at both ends of the valve shaft 202.

[0064] The assembly method of the direct-acting solenoid valve described in this application includes the steps of assembling the solenoid assembly 100, assembling the valve body assembly 200, and finally the overall assembly step.

[0065] The specific steps for assembling the electromagnetic component 100 are as follows:

[0066] Reference Figure 8 The electromagnetic coil 106 is wound around the coil frame 105, and the two terminals 107 are fixed in the two terminal fixing holes 1051 of the coil frame 105. The two leads of the electromagnetic coil 106 are respectively soldered to the two terminals 107.

[0067] Reference Figure 9 Place the internal support 104 into the housing 101, as shown in the figure. Figure 10 Install the coil frame 105 into the internal support 104, as per [reference]. Figure 11Screw the stationary iron core 108 onto the internal support 104, referring to... Figure 12 Weld the coil cover 111 to the internal support 104;

[0068] Reference Figure 13 Connect the circuit board 102 to the two terminals 107 and solder them.

[0069] Reference Figure 14 The moving iron core spring 110 is sleeved on the moving iron core 109, and then the moving iron core 109 is installed into the coil frame 105.

[0070] Reference Figure 15 This refers to the assembled electromagnetic component 100.

[0071] The specific steps for assembling valve body assembly 200 are as follows:

[0072] Reference Figure 16 Assemble the reset button 204 onto the valve shaft seat 205;

[0073] Reference Figure 17 Assemble the valve shaft 202 and valve shaft spring 203 onto the valve shaft seat 205;

[0074] Reference Figure 18 Components such as valve shaft 202 and valve shaft seat 205 are assembled onto valve body 201;

[0075] Reference Figure 19 This refers to the assembled valve body assembly 200.

[0076] The final overall assembly steps are as follows:

[0077] Reference Figure 20 The electromagnetic component 100 is assembled onto the valve body component 200 using screws 300.

[0078] Reference Figure 21 Assemble the circuit board protective cover 103 onto the housing 101 to complete the assembly work.

[0079] The working principle of this application is as follows: Two terminal fixing holes 1051 are provided on the coil frame 105, and two terminals 107 are respectively set in the two terminal fixing holes 1051. Then, the two leads of the electromagnetic coil 106 are electrically connected to the two terminals 107 respectively. Then, the circuit board 102 is plugged into the two terminals 107 by plugging and soldering to complete the electrical connection between the leads and the circuit board. Since it is not necessary to flip the circuit board 102 to solder the leads, the leads do not need to be designed to be long, the wiring is neater, and the leads do not need to be wound around the side of the circuit board 102, so there is no friction damage to the insulating paint on the leads. Therefore, the technical problems in the prior art are well solved.

[0080] When the electromagnetic coil 106 is energized, the stationary iron core 108 attracts the moving iron core 109, the valve shaft spring 203 pushes the valve shaft 202 to move, the end face seal 2023 contacts the first sealing blade 2015 and separates from the second sealing blade 2051, the first vent 2012 and the second vent 2013 are closed, and the second vent 2013 and the third vent 2014 are connected; when the electromagnetic coil 106 is de-energized, the stationary iron core 108 no longer attracts the moving iron core 109, and the moving iron core spring 102... 0 pushes the valve shaft 202 to move, the end face seal 2023 separates from the first sealing blade 2015 and contacts the second sealing blade 2051, the first vent 2012 and the second vent 2013 are connected, the second vent 2013 and the third vent 2014 are closed. By energizing and de-energizing the electromagnetic coil 106, the functions of closing and connecting the first vent 2012 and the second vent 2013, as well as the functions of closing and connecting the second vent 2013 and the third vent 2014 are realized.

[0081] Furthermore, since the valve shaft 202 is hollow, the air pressure at both ends of the valve shaft 202 is balanced, the valve shaft 202 moves smoothly, and the force at both ends of the valve shaft 202 is improved, resulting in better sealing between the end face seal 2023 and the first sealing blade 2015 and the second sealing blade 2051.

[0082] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A direct-acting electromagnetic valve characterized by comprising: It includes an electromagnetic assembly (100) and a valve body assembly (200), the electromagnetic assembly (100) is fixed on the valve body assembly (200) by a screw (300); The electromagnetic assembly (100) includes a shell (101), a circuit board (102), a circuit board protection cover (103), an internal support (104), a coil former (105), an electromagnetic coil (106), two wiring terminals (107), a static iron core (108), a moving iron core (109), a moving iron core spring (110) and a coil cover (111); The shell (101) is sleeved outside the internal support (104), the coil former (105) is fixed between the internal support (104) and the coil cover (111), and the internal support (104) and the coil cover (111) are fixed by welding; Two terminal fixing holes (1051) are formed in the coil former (105), the two wiring terminals (107) are respectively arranged in the two terminal fixing holes (1051), the electromagnetic coil (106) is wound on the coil former (105), and two lead wires of the electromagnetic coil (106) are electrically connected with the two wiring terminals (107); the lead wires of the electromagnetic coil (106) are wound around the wiring terminals (107) for multiple turns and are welded on the wiring terminals (107); The circuit board (102) is arranged outside the shell (101), the two wiring terminals (107) are inserted and welded on the circuit board (102), and the circuit board protection cover (103) is fixed on the shell (101) and used for covering and protecting the circuit board (102); The static iron core (108) and the moving iron core (109) are located in the inner cavity of the coil former (105), the static iron core (108) is screwed on the internal support (104), and the moving iron core (109) is slidably arranged in the inner cavity of the coil former (105); One end of the moving iron core (109) protrudes from the coil cover (111) and is provided with a shaft shoulder (1091), the moving iron core spring (110) is sleeved on the moving iron core (109), one end of the moving iron core spring (110) abuts against the shaft shoulder (1091), and the other end of the moving iron core spring (110) abuts against the outer end face of the coil cover (111); The valve body assembly (200) includes a valve body (201), a valve shaft (202), a valve shaft spring (203), a reset button (204) and a valve shaft seat (205), the valve body (201) is internally provided with a valve cavity (2011), the valve shaft seat (205) is screwed on the outer side end of the valve cavity (2011), the valve shaft (202) is slidably arranged in the inner cavity of the valve shaft seat (205), and the reset button (204) is slidably arranged at the outer side end of the inner cavity of the valve shaft seat (205); the valve shaft spring (203) is sleeved on the valve shaft (202), one end of the valve shaft spring (203) abuts against the side face of the second protruding ring (2022) of the valve shaft (202), and the other end of the valve shaft spring (203) abuts against the inner side face of the reset button (204), so that the valve shaft spring (203) is used for automatic reset of the valve shaft (202) and the reset button (204). The valve body (201) is provided with a first vent (2012), a second vent (2013) and a third vent (2014) on the side wall, a first sealing blade (2015) is arranged in the valve cavity (2011), the inner side end of the valve shaft seat (205) is provided with a second sealing blade (2051), the valve shaft (202) is provided with a first convex ring (2021) and a second convex ring (2022), the first convex ring (2021) is sleeved with an end face sealing element (2023), the end face sealing element (2023) can be in contact with the first sealing blade (2015) to close the passage between the first vent (2012) and the second vent (2013), and the end face sealing element (2023) can also be in contact with the second sealing blade (2051) to close the passage between the second vent (2013) and the third vent (2014); the valve shaft (202) is hollow to balance the air pressure at both ends of the valve shaft (202).

2. The direct-acting solenoid valve according to claim 1, characterized by The two side surfaces of the coil framework (105) are also provided with wire grooves (1052) for leading the wires of the electromagnetic coil (106).

3. The direct-acting solenoid valve according to claim 1, characterized by The shell (101) is provided with a plurality of buckles (1011), and the side surface of the circuit board protection cover (103) is correspondingly provided with a plurality of buckle holes (1031), and the circuit board protection cover (103) is clamped on the shell (101).

4. The direct-acting solenoid valve according to claim 3, characterized in that The shell (101) is provided with a positioning column (1012), and the circuit board (102) is provided with a positioning notch (1021) at the corresponding position, the positioning column (1012) is embedded in the positioning notch (1021), so that the circuit board (102) is positioned on the shell (101).

5. The direct-acting electromagnetic valve according to any one of claims 1 to 4, characterized in that: A first dynamic sealing ring (2041) is sleeved on the reset button (204) to realize the sliding sealing between the reset button (204) and the valve shaft seat (205); An annular groove (2024) is arranged on the second convex ring (2022), and a second dynamic sealing ring (2025) is arranged in the annular groove (2024) to realize the sliding sealing between the valve shaft (202) and the valve shaft seat (205); A first sealing ring (2052) and a second sealing ring (2053) are sleeved on the valve shaft seat (205), the first sealing ring (2052) is used to realize the sealing between the inner cavity of the valve body (201) and the outside, and the second sealing ring (2053) is used to realize the sealing between the second vent (2013) and the third vent (2014); A third sealing ring (1081) is sleeved on the static iron core (108) to realize the sealing between the inner cavity of the coil framework (105) and the outside, and the coil cover (111) is provided with a fourth sealing ring (1111) and a fifth sealing ring (1112) on the inner and outer sides, the fourth sealing ring (1111) is used to realize the sealing between the coil framework (105) and the coil cover (111), and the fifth sealing ring (1112) is used to realize the sealing between the coil cover (111) and the valve body (201).

6. The direct-acting solenoid valve according to claim 5, characterized in that The outer circumferential surface of the first convex ring (2021) is a U-shaped surface, and a plurality of annular grooves (20211) are arranged on the outer circumferential surface, and the end face sealing element (2023) is correspondingly provided with annular protrusions (20231) matched with the annular grooves (20211).

7. The direct-acting solenoid valve according to claim 5, wherein The valve shaft (202) comprises a first shaft (2026) and a second shaft (2027), and the first shaft (2026) and the second shaft (2027) are both provided with shaft holes, one end of the second shaft (2027) extends into the shaft hole of the first shaft (2026) and is riveted and sealed, the first convex ring (2021) is arranged on the first shaft (2026), and the second convex ring (2022) is arranged on the second shaft (2027).

8. The direct-acting solenoid valve according to claim 5, wherein The inner side end of the reset button (204) is further provided with a plastic part (2042), and when the plastic part (2042) abuts against the second shaft (2027), the shaft hole of the second shaft (2027) cannot be completely closed.

9. A method of assembling a direct-acting electromagnetic valve according to any one of claims 1 to 8, characterized in that, The steps include: The electromagnetic coil (106) is wound on the coil skeleton (105), the two terminal fixing holes (1051) of the coil skeleton (105) are fixed on the two terminal fixing holes (1051) of the coil skeleton (105), and the two lead wires of the electromagnetic coil (106) are respectively welded on the two terminal fixing holes (1051) of the coil skeleton (105). The internal support (104) is placed in the shell (101), the coil skeleton (105) is installed in the internal support (104), the static iron core (108) is screwed to the internal support (104), and the coil cover (111) is welded to the internal support (104). The circuit board (102) is inserted into the two terminal fixing holes (1051) and welded; The moving iron core spring (110) is sleeved on the moving iron core (109), and then the moving iron core (109) is installed in the coil skeleton (105); The electromagnetic assembly (100) is installed on the valve body assembly (200) through the screw (300); Then the circuit board protection cover (103) is installed on the shell (101). Then the circuit board protection cover (103) is installed on the shell (101).

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