Double-layer plastic-coated pilot valve

Abstract

The utility model discloses a double-layer plastic-coated pilot valve, belongs to the field of pilot valves, and aims to solve the problems that in the prior art, the shrinkage rate of one-time formed plastic is large, the surface of a product is not attractive enough, the complex environment requirement cannot be met, the IP protection level needs to be improved, the internal structure needs to be optimized so that the pilot valve can be smaller and more compact, and the precision and the stability need to be improved. The utility model comprises a plastic-coated shell, a movable iron core assembly and a forming seat, the plastic-coated shell comprises a primary plastic-coated shell and a secondary plastic-coated shell, the movable iron core assembly comprises a movable iron core and a conical sleeve member, the conical sleeve member is sleeved on the periphery of the movable iron core, and the forming seat is arranged at the lower end of the movable iron core assembly. The secondary plastic coating structure is lower in plastic shrinkage rate and higher in IP protection level, and can meet the requirements of complex environments; the movable iron core assembly is embedded into the forming base, and the whole is smaller and more compact; the mounting seat and the forming seat are provided with multi-step matching surfaces, so that the precision is higher; and the positioning columns penetrate through the PCB and are connected with the U-shaped frame side plates in a buckling manner, so that the stability is higher.

Description

Technical Field

[0001] The utility model relates to the field of pilot valves, and more specifically, to a double-layer plastic-coated pilot valve. Background Art

[0002] Pilot valves play a crucial role in fluid control systems, ensuring the efficient and stable operation of the entire system by precisely regulating the pressure and flow rate of the fluid. There are four types of small pilot valves on the current market: lead-out type, M8 connector type, plug-in type, and DIN terminal type. Their surface structures are divided into two types: shell type and plastic-coated type. Among them, the IP dust and waterproof effect of the shell-type pilot valve is poor, and the existing plastic-coated pilot valves are all single-layer plastic-coated and formed in one step. The shrinkage rate of the plastic is relatively large, the surface of the product is not beautiful enough, it cannot meet the requirements of complex environments, and the IP protection level needs to be improved. Small size and compactness have always been the goals pursued by small pilot valves. There is still room for optimization in this regard for existing small pilot valves, and their structures are relatively complex, so the cost can be further reduced. In addition, the accuracy and stability of existing small pilot valves are also lacking.

[0003] Chinese Patent Publication No. CN208687070U, publication date April 2, 2019, the name of the utility model is a micro solenoid valve. This application discloses a micro solenoid valve, which includes an electromagnetic component and a valve body component. The electromagnetic component includes a coil component and a coil plastic-coated housing. The coil component includes a coil bracket, an iron core kit, and a coil. A stepped through hole is provided on the moving iron core. One end of the moving iron core spring abuts against the static iron core, and the other end extends into the stepped through hole and abuts against the stepped surface of the stepped through hole. The valve body component includes a valve body, a base, and a push rod component. The valve body is sequentially provided with an exhaust hole, an air outlet hole, and an air inlet hole. The exhaust hole is located on the side close to the coil plastic-coated housing. The push rod component includes a switching sealing head, a pressing spring, and a push piece. The push piece includes a rod seat and a rod, and the rod passes through the base and abuts against the moving iron core. The micro solenoid valve disclosed in the above patent document has the advantages of small volume, compact structure, less installation space occupied, and wide application range. The plastic-coated structure is adopted to avoid the problem of poor IP dust and waterproof effect of the shell-type pilot valve. However, its single-layer plastic-coated structure has the problems of large shrinkage rate of the plastic formed in one step, not beautiful enough surface of the product, inability to meet the requirements of complex environments, and the need to improve the IP protection level. In addition, there is room for optimization in its internal structure to make it more small and compact, and there is also room for improvement in its accuracy and stability. Summary of the Invention

[0004] In view of the problems of the prior art mentioned in the background art, namely, the shrinkage rate of the plastic in the primary plastic coating structure is relatively large, the surface of the product is not beautiful enough, it cannot meet the requirements of complex environments, and the IP protection level needs to be improved, and there is room for optimization in its internal structure to make it more compact, and there is also room for improvement in its accuracy and stability. The present utility model provides a double-layer plastic-coated pilot valve, which performs secondary plastic coating on the basis of the primary plastic coating structure, has a lower plastic shrinkage rate, a more beautiful product surface, a higher IP dust and water protection level, and can meet the requirements of complex environments; the conical kit it adopts is embedded in the forming seat, so that the moving iron core part sleeved in the conical kit is placed in the wire frame, which can reduce the design height of the electromagnetic component and make the whole more compact; the multi-stage stepped mating surfaces of the mounting seat and the forming seat it adopts make the mating accuracy higher, and the structure of the plastic cover positioning post passing through the PCB board and being snap-connected to the side plate of the U-shaped frame it adopts makes the stability higher.

[0005] To solve the above technical problems, the present utility model adopts the following technical solutions: A double-layer plastic-coated pilot valve, comprising: a plastic-coated housing, the plastic-coated housing is composed of a primary plastic-coated housing and a secondary plastic-coated housing; a moving iron core assembly, the moving iron core assembly includes a moving iron core and a conical kit, and the conical kit is sleeved around the moving iron core; a forming seat, the forming seat is arranged at the lower end of the moving iron core assembly. In the present utility model, secondary plastic coating is performed on the basis of the primary plastic coating structure, the plastic shrinkage rate is lower, the product surface is more beautiful, the IP dust and water protection level is higher, and the requirements of complex environments can be met; the conical kit it adopts is embedded in the forming seat, so that the moving iron core part sleeved in the conical kit is placed in the wire frame, which can reduce the design height of the electromagnetic component and make the whole more compact.

[0006] Preferably, the double-layer plastic-coated pilot valve further includes a coil assembly and a control module, the control module includes a plastic cover, and the primary plastic-coated housing wraps the coil assembly and the control module. In this structure, the plastic cover can protect the components in the control module, and the primary plastic-coated housing wrapped outside the coil assembly and the control module is the basis for subsequent secondary plastic coating.

[0007] Preferably, the secondary plastic-coated housing wraps the primary plastic-coated housing and the plastic cover. During secondary plastic coating, the injection pressure can be freely adjusted according to the appearance situation. The secondary plastic coating structure improves the quality while increasing the flexibility of injection molding, has a lower plastic shrinkage rate, a more beautiful product surface, a higher IP dust and water protection level, and can meet the requirements of complex environments.

[0008] Preferably, the moving iron core assembly further includes a moving iron core spring, and the moving iron core and the conical kit are connected by the moving iron core spring. Different from the conventional spring installation method in which a hole is opened in the moving iron core of the solenoid valve and a spring is built in to abut against the electromagnet, in this design, the spring installation structure is more concise and the moving iron core and the conical kit are integrated.

[0009] Preferably, the double-layer plastic-coated pilot valve further includes a push rod. There is a gap between the bottom surface of the moving iron core and the bottom end of the lower conical kit in the power-off state, and the gap is larger in the power-on state. The top of the push rod abuts against the bottom surface of the moving iron core. The gap between the bottom surface of the moving iron core and the bottom end of the lower conical kit helps the top of the push rod and the bottom surface of the moving iron core to abut stably and reliably.

[0010] Preferably, the coil assembly includes a bobbin and an electromagnet. The moving iron core is placed inside the bobbin. In the power-off state, there is a gap between the moving iron core and the electromagnet. The size of this gap is determined through a large number of experiments. This structure can ensure that the moving iron core moves smoothly inside the bobbin during operation and responds quickly; the part of the moving iron core sleeved inside the conical kit is placed inside the bobbin, which can reduce the design height of the electromagnetic component and make it more compact as a whole.

[0011] Preferably, the conical kit cooperates with the forming seat and the plastic-coated housing respectively. The coil assembly further includes a U-shaped frame, and the conical kit abuts against the U-shaped frame. In this structure, the cooperation relationship between the conical kit and the forming seat makes the internal structure more compact, which is beneficial to reducing the design height of the upper electromagnetic component, making the whole smaller, and saving costs; the conical kit fits tightly with the surrounding components and abuts against the U-shaped frame, with a tight structure and good stability.

[0012] Preferably, the double-layer plastic-coated pilot valve further includes a mounting seat and a mounting seat sealing ring. The mounting seat cooperates with the forming seat, and their mating surfaces are multi-stage stepped and sealed by the mounting seat sealing ring. The design of the multi-stage stepped mating surfaces of the mounting seat and the forming seat makes their mating accuracy higher. At the same time, using the mounting seat sealing ring for sealing has a better dust and waterproof effect.

[0013] Preferably, the control module further includes a PCBA combination. The PCBA combination includes a power connector and an indicator light. The plastic cover plate is sleeved on the power connector and the indicator light and is hermetically fitted with the power connector and the indicator light respectively. The PCBA combination refers to the combination of a PCB board and components such as a power connector and an indicator light soldered on the PCB board. In this design, the power connector can be one of an outgoing line type, an M8 connector type, a plug-in type, and a DIN terminal type. The indicator light plays a role in indicating the working state. The plastic cover plate is hermetically sleeved on the power connector and the indicator light, making it have better dust and waterproof performance.

[0014] Preferably, the plastic cover plate includes positioning posts, the PCBA assembly further includes a PCB board, and the coil assembly further includes U-shaped frame side plates. The positioning posts pass through the PCB board and are snap-connected to the U-shaped frame side plates. The structure in which the positioning posts of the plastic cover plate pass through the PCB board and are snap-connected to the U-shaped frame side plates makes it more stable.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: (1) Secondary plastic coating is carried out on the basis of the primary plastic coating structure. During the secondary plastic coating, the injection pressure can be freely adjusted according to the appearance situation. The secondary plastic coating structure improves the quality while increasing the flexibility of injection molding, with a lower plastic shrinkage rate, a more beautiful product surface, and a higher IP dust and waterproof rating, which can meet the requirements of complex environments; (2) The conical kit is embedded in the molding seat, so that the moving iron core part sleeved in the conical kit is placed in the wire frame, which can reduce the design height of the electromagnetic assembly, making it more compact as a whole and saving costs; (3) The multi-stage stepped mating surfaces of the mounting seat and the molding seat make their mating accuracy higher; (4) The structure in which the positioning posts of the plastic cover plate pass through the PCB board and are snap-connected to the U-shaped frame side plates makes it more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a sectional view of the present utility model.

[0017] Figure 2 is a schematic diagram of the primary plastic coating structure of the present utility model.

[0018] Figure 3 is a schematic diagram of the secondary plastic coating structure of the present utility model.

[0019] Figure 4 is a perspective view of the present utility model.

[0020] Figure 5 is a front view of the present utility model.

[0021] Figure 6 is a top view of the present utility model.

[0022] Figure 7 is a left view of the present utility model.

[0023] Figure 8 is a rear view of the present utility model. [[ID=4)]]

[0024] Figure 9 is a perspective view of Embodiment 2 of the present utility model.

[0025] Figure 10 is a front view of Embodiment 2 of the present utility model.

[0026] Figure 11 is a top view of Embodiment 2 of the present utility model.

[0027] Figure 12 It is the left view of Embodiment 2 of the present utility model.

[0028] Figure 13 It is the perspective view of Embodiment 3 of the present utility model.

[0029] Figure 14 It is the front view of Embodiment 3 of the present utility model.

[0030] Figure 15 It is the top view of Embodiment 3 of the present utility model.

[0031] Figure 16 It is the left view of Embodiment 3 of the present utility model.

[0032] In the figure: 1. Electromagnetic component, 11. Plastic-coated housing, 111. Primary plastic-coated housing, 1111. Boss, 1112. First alignment hole, 1113. Second alignment hole, 1114. First screw groove, 1115. Second screw groove, 112. Secondary plastic-coated housing, 1121. First screw hole, 1122. Second screw hole, 1123. First screw, 1124. Second screw, 1125. Guide positioning housing, 11251. First baffle, 11252. Second baffle, 11253. Third baffle, 11254. Positioning member, 11255. First slot, 11256. Second slot, 12. Coil assembly, 121. U-shaped frame combination, 1211. U-shaped frame, 1212. U-shaped frame side plate, 122. Wire frame, 1221. Wire frame sealing ring, 123. Enameled wire, 124. Electromagnet, 1241. Electromagnet sealing ring, 13. Control module, 131. PCBA combination, 1311. PCB board, 1312. Power connector, 13121. Cable, 13122. First contact post, 13123. Second contact post, 13124. First metal post, 13125. Second metal post, 13126. Third metal post, 1313. Indicator light, 132. Plastic cover plate, 1321. Positioning post, 1322. Sleeve, 1323. Cylindrical interface, 2. Valve body assembly, 21. Moving iron core assembly, 211. Moving iron core, 212. Conical kit, 213. Moving iron core spring, 22. Forming seat, 221. Forming seat sealing ring, 23. Mounting seat, 231. Thumb lever assembly, 2311. Tightening spring, 2312. Switching sealing head, 2313. Thumb lever, 232. Mounting seat channel, 2321. First channel, 2322. Second channel, 2323. Third channel, 2324. Sealing gasket, 233. Mounting seat sealing ring, 234. First bolt hole, 235. Second bolt hole. Detailed implementation manners

[0033] The technical solution of the present utility model will be further specifically described below through specific embodiments in conjunction with the accompanying drawings.

[0034] Embodiment 1:

[0035] As Figures 1 to 8 shown, the double-layer plastic-coated pilot valve includes an electromagnetic component 1 and a valve body component 2. The electromagnetic component 1 includes a coil component 12, a control module 13, and a plastic-coated housing 11. The coil component 12 includes a bobbin 122. The cross-section of the bobbin 122 is I-shaped, with an opening inside. An electromagnet 124 is placed in the inner hole of the bobbin 122. The upper end of the electromagnet 124 is flush with the upper end of the bobbin 122. A seal connection is made between the electromagnet 124 and the bobbin 122 using an electromagnet seal ring 1241. An enameled wire 123 is wound around the outside of the bobbin 122. The coil component 12 includes a U-shaped frame combination 121. The U-shaped frame combination 121 is composed of a U-shaped frame 1211 and U-shaped frame side plates 1212. The U-shaped frame 1211 is formed by bending a steel plate. There are openings on its left and lower sides. The diameter of the lower opening is the same as the inner hole diameter of the bobbin 122. The connection method between the U-shaped frame 1211 and the U-shaped frame side plates 1212 is welding. The bobbin 122, the electromagnet 124 placed inside it, and the enameled wire 123 wound around its outside are integrally fixed in the U-shaped frame combination 121. A seal fit is made between this whole and the U-shaped frame combination 121 using a bobbin seal ring 1221, where the inner hole of the bobbin 122 is aligned with the lower opening of the U-shaped frame 1211. The control module 13 includes a PCBA combination 131. The PCBA combination 131 refers to the combination formed by a PCB board 1311 and the components soldered on the PCB board 1311. The PCBA combination 131 includes a PCB board 1311, a power connector 1312, and an indicator light 1313 soldered on the PCB board 1311. The indicator light 1313 functions to indicate the current working state of the double-layer plastic-coated pilot valve. The current embodiment represents an out-wire type double-layer plastic-coated pilot valve. The control module 13 includes a plastic cover 132. The surface of the plastic cover 132 is provided with a sleeve 1322. The plastic cover 132 is sleeved on the above-mentioned power connector 1312 and indicator light 1313. The power connector 1312, that is, the outside of the cable 13121 in the current embodiment, is tightly sleeved with a sleeve 1322, and the plastic cover 132 is respectively in seal fit with the power connector 1312 and the indicator light 1313, so as to make it have better dust and water protection performance. The plastic cover 132 includes positioning posts 1321. The upper end of the PCB board 1311 and the U-shaped frame side plate 1212 are fixed by welding, and the positioning posts 1321 pass through the PCB board 1311 and the U-shaped frame side plate 1212 for snap connection. The structure in which the positioning posts 1321 on the plastic cover 132 pass through the PCB board 1311 and the U-shaped frame side plate 1212 for snap connection makes its stability higher.

[0036] The plastic-coated housing 11 includes a primary plastic-coated housing 111. The primary plastic-coated housing 111 wraps the above-mentioned coil assembly 12 and control module 13. Among them, the primary plastic-coated housing 111 partially wraps the plastic cover plate 132 in the control module 13. The primary plastic-coated housing 111 wrapped outside the coil assembly 12 and control module 13 is the basis for subsequent secondary plastic coating. The upper surface of the primary plastic-coated housing 111 has a boss 1111. The first alignment hole 1112 and the second alignment hole 1113 are respectively provided on the left and right sides of the boss 1111. The primary plastic-coated housing 111 also has two grooves, namely the first screw slot 1114 and the second screw slot 1115. The plastic-coated housing 11 also includes a secondary plastic-coated housing 112. The secondary plastic-coated housing 112 is an integral body that wraps the primary plastic-coated housing 111 and the plastic cover plate 132. Among them, the secondary plastic-coated housing 112 partially wraps the plastic cover plate 132. During secondary plastic coating, the injection pressure can be freely adjusted according to the appearance. The secondary plastic coating structure improves the quality while increasing the flexibility of injection molding. The plastic shrinkage rate is lower, the product surface is more beautiful, and the IP dust and water protection level is higher, which can meet the requirements of complex environments. The secondary plastic-coated housing 112 is respectively provided with a first screw hole 1121 and a second screw hole 1122 at positions corresponding to the first screw slot 1114 and the second screw slot 1115 of the primary plastic-coated housing 111 for the installation of screws. The right plane of the secondary plastic-coated housing 112 is flush with the right surface of the plastic cover plate 132. The lower end of the right surface of the secondary plastic-coated housing 112 has a certain degree of curvature, and this design is more beautiful.

[0037] The valve body assembly 2 includes a moving iron core assembly 21, a forming seat 22, and a mounting seat 23. The moving iron core assembly 21 includes a moving iron core 211 and a conical kit 212. The conical kit 212 is sleeved on the periphery of the moving iron core 211. The moving iron core assembly 21 further includes a moving iron core spring 213. The moving iron core 211 and the conical kit 212 are connected by the moving iron core spring 213. Different from the conventional solenoid valve moving iron core with an internal opening and a spring built-in to abut against the electromagnet for spring installation, in this design, the spring installation structure is more concise and makes the moving iron core 211 and the conical kit 212 integrated. In addition, in the power-off state, there is a certain gap between the bottom surface of the moving iron core 211 and the bottom end of the conical kit 212 below. In the power-on state, since the moving iron core moves upward under the electromagnetic force, the above gap becomes larger. The lower surface of the forming seat 22 is designed as a multi-stage stepped shape, and several channels are arranged in the forming seat 22 for precise cooperation with surrounding components. The upper surface of the mounting seat 23 is designed with multi-stage stepped grooves. The mounting seat 23 includes a push rod assembly 231. The lower end of the push rod 2313 is fixedly sleeved on the switching sealing head 2312. A tightening spring 2311 is provided at the lower end of the switching sealing head 2312. The mounting seat 23 further includes a mounting seat channel 232. The mounting seat channel 232 includes a first channel 2321, a second channel 2322, a third channel 2323, and sealing gaskets 2324 provided at the entrances and exits of the above three channels. The mounting seat 23 further includes a first bolt hole 234 and a second bolt hole 235. Matching corresponding bolts is used to install the valve body assembly 2 into the environment where the current pilot valve is required. The valve body assembly 2 and the electromagnetic assembly 1 are connected by screws. After the electromagnetic assembly 1 and the valve body assembly 2 below are accurately aligned, the first screw 1123 and the second screw 1124 respectively pass through the first screw hole 1121 and the second screw hole 1122 on the upper surface of the secondary plastic-coated housing 112 to firmly connect the electromagnetic assembly 1 and the valve body assembly 2.

[0038] The moving iron core 211 is respectively placed inside the wire holder 122 through the openings on the lower side of the U-shaped holder 1211 and the inner hole of the wire holder 122. There is a tiny gap between the moving iron core 211 and the inner wall of the hole where it is located. In the power-off state, there is a gap between the upper surface of the moving iron core 211 and the lower surface of the electromagnet 124. The size of this gap is determined through a large number of experiments. This structure can ensure that the moving iron core 211 moves smoothly inside the wire holder 122 during operation and responds quickly. The part of the moving iron core 211 sleeved inside the conical kit 212 is placed inside the wire holder 122, which can reduce the design height of the electromagnetic assembly 1 and make it more compact as a whole. In the ejector rod assembly 231 inside the mounting seat 23, the ejector rod 2313 passes through the forming seat 22 through the channel provided inside the forming seat 22, so that the top of the ejector rod 2313 abuts against the bottom surface of the moving iron core 211. In the power-off state, the gap between the bottom surface of the moving iron core 211 and the bottom end of the lower conical kit 212 helps the top of the ejector rod 2313 and the bottom surface of the moving iron core 211 to abut stably and reliably. The conical kit 212 cooperates with the forming seat 22 and the plastic-coated housing 11 respectively, and the conical kit 212 abuts against the U-shaped holder 1211. In this structure, the embedded mating relationship between the conical kit 212 and the forming seat 22 makes the internal structure more compact, which is beneficial to reducing the design height of the upper electromagnetic assembly 1, making the whole smaller, and saving costs. The conical kit 212 fits tightly with the surrounding components and abuts against the U-shaped holder 1211, with a tight structure and good stability. The upper end of the forming seat 22 and the lower end of the electromagnetic assembly 1 are sealed with a forming seat sealing ring 221. In addition, the forming seat 22 and the mounting seat 23 are precisely matched, and their mating surfaces are multi-stage stepped, and are sealed with a mounting seat sealing ring 233. The design of the multi-stage stepped mating surfaces of the forming seat 22 and the mounting seat 23 enables the third channel 2323 inside the mounting seat 23 to be accurately aligned with the corresponding horizontal channel provided inside the forming seat 22, and the accuracy is higher. At the same time, it is sealed with a mounting seat sealing ring 233, and the dust and waterproof effect is better.

[0039] The working principle of the present utility model is as follows. When the double-layer plastic-coated pilot valve is in the power-off state, the indicator light 1313 is off. Under the action of the elastic force of the moving iron core spring 213 acting vertically downward on the moving iron core 211, a vertically downward force is applied to the top of the ejector rod 2313 abutted against the lower surface of the moving iron core 211. Since the lower end of the ejector rod 2313 is fixedly sleeved on the switching sealing head 2312, a vertically downward force is applied to the switching sealing head 2312, causing the switching sealing head 2312 to block the inner hole of the lower first channel 2321 located in the mounting seat 23. The second channel 2322 and the third channel 2323 are connected, and the fluid flows into the valve body from the third channel 2323 and flows out from the second channel 2322. When the pilot valve is in the power-on state, the indicator light 1313 is on, and the electromagnet 124 exerts a vertically upward force on the moving iron core 211. Since there is a gap between the upper surface of the moving iron core 211 and the lower surface of the electromagnet 124, the moving iron core 211 moves upward under the action of the vertically upward electromagnetic force generated by the electromagnet 124, overcoming the elastic force of the moving iron core spring 213. As a result, the switching sealing head 2312 moves upward under the action of the elastic force of the tightening spring 2311 acting vertically upward below it, disengaging from the inner hole below it that was originally blocked, and blocking the corresponding channel provided in the forming seat 22 that is accurately aligned with the third channel 2323 above and the opening below the forming seat 22. The second channel 2322 and the first channel 2321 are connected, and the fluid flows into the valve body from the first channel 2321 and flows out from the second channel 2322.

[0040] Embodiment 2:

[0041] As Figures 9 to 12The double-layer plastic-coated pilot valve shown is different from that in Embodiment 1 in that the current embodiment represents a plug-in double-layer plastic-coated pilot valve, and its secondary plastic-coated housing 112 further includes a guiding and positioning housing 1125, which is used to guide and fix the plug when the plug is inserted from the outside. The guiding and positioning housing 1125 includes a first baffle 11251 on the left side, a second baffle 11252 on the right side, a third baffle 11253 on the lower side, and a positioning member 11254 in the middle. Among them, the left and right sides of the third baffle 11253 are respectively connected to the first baffle 11251 and the second baffle 11252, and the left and right sides of the positioning member 11254 are also respectively connected to the first baffle 11251 and the second baffle 11252. The lower end of the positioning member 11254 is connected to the third baffle 11253. The first baffle 11251, the third baffle 11253 and the positioning member 11254 surround to form a first slot 11255, and the second baffle 11252, the third baffle 11253 and the positioning member 11254 surround to form a second slot 11256. Both the first baffle 11251 and the second baffle 11252 are approximate square sheets with a rounded corner, the third baffle 11253 is a rectangular sheet, and the middle of the positioning member 11254 is a square block with two grooves, and a horizontal rod-shaped structure is also provided thereon. When the plug is inserted into the guiding and positioning housing 1125 from the outside, the first baffle 11251 can prevent the plug from tilting to the left, the second baffle 11252 can prevent the plug from tilting to the right, the third baffle 11253 can prevent the plug from tilting to the lower side, the square block in the middle of the positioning member 11254 can prevent the plug from tilting to the left or right, and the horizontally arranged rod-shaped structure above the positioning member 11254 can prevent the plug from tilting to the upper side. When the plug is inserted into the guiding and positioning housing 1125 from the outside, the plug is guided by the first slot 11255 and the second slot 11256, and is accurately connected to the first contact post 13122 and the second contact post 13123 respectively arranged in the first slot 11255 and the second slot 11256, so as to realize the power connection of the plug-in double-layer plastic-coated pilot valve, and the relative position of the plug and the guiding and positioning housing 1125 is fixed by the grooves provided on the square block in the middle of the positioning member 11254.

[0042] Embodiment 3:

[0043] As Figures 13 to 16The double-layer plastic-coated pilot valve shown is different from those in Embodiment 1 and Embodiment 2 in that the current embodiment represents a DIN-style double-layer plastic-coated pilot valve, and its power supply connector 1312 includes a metal sheet disposed within a cylindrical interface 1323 and a plurality of metal post connectors. The metal post connectors include a first metal post 13124, a second metal post 13125, and a third metal post 13126, wherein the third metal post 13126 functions as a ground. The cylindrical interface 1323 is disposed on the surface of a plastic cover plate 132, and the plastic cover plate 132 is in sealing fit with the above-mentioned plurality of metal post connectors, namely the first metal post 13124, the second metal post 13125, and the third metal post 13126.

[0044] The above-described embodiments are only preferred solutions of the present utility model and do not impose any form of limitation on the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the utility model shall be included within the protection scope of the present utility model.

Claims

1. Double-layer plastic-coated pilot valve, characterized in that, Comprising: A plastic-coated housing (11), which is composed of a primary plastic-coated housing (111) and a secondary plastic-coated housing (112); A moving iron core assembly (21), which includes a moving iron core (211) and a conical kit (212), and the conical kit (212) is sleeved around the moving iron core (211); A forming seat (22), which is arranged at the lower end of the moving iron core assembly (21).

2. The double-layer plastic-coated pilot valve according to claim 1, characterized in that, The double-layer plastic-coated pilot valve further includes a coil assembly (12) and a control module (13). The control module (13) includes a plastic cover plate (132), and the primary plastic-coated housing (111) wraps the coil assembly (12) and the control module (13).

3. The double-layer plastic-coated pilot valve according to claim 2, characterized in that, The secondary plastic-coated housing (112) wraps the primary plastic-coated housing (111) and the plastic cover plate (132).

4. The double-layer plastic-coated pilot valve according to claim 1, characterized in that, The moving iron core assembly (21) further includes a moving iron core spring (213), and the moving iron core (211) and the conical kit (212) are connected by the moving iron core spring (213).

5. The double-layer plastic-coated pilot valve according to any one of claims 1-4, characterized in that, The double-layer plastic-coated pilot valve further includes a push rod (2313). There is a gap between the bottom surface of the moving iron core (211) and the bottom end of the lower conical kit (212) in the power-off state, and the gap is larger in the power-on state. The top of the push rod (2313) abuts against the bottom surface of the moving iron core (211).

6. The double-layer plastic-coated pilot valve according to claim 2 or 3, characterized in that, The coil assembly (12) includes a bobbin (122) and an electromagnet (124). The moving iron core (211) is placed inside the bobbin (122). In the power-off state, there is a gap between the moving iron core (211) and the electromagnet (124).

7. The double-layer plastic-coated pilot valve according to claim 2 or 3, characterized in that, The conical kit (212) cooperates with the forming seat (22) and the plastic-coated housing (11) respectively. The coil assembly (12) further includes a U-shaped frame (1211), and the conical kit (212) abuts against the U-shaped frame (1211).

8. The double-layer plastic-coated pilot valve according to any one of claims 1-4, characterized in that, The double-layer plastic-coated pilot valve further includes a mounting seat (23) and a mounting seat sealing ring (233). The mounting seat (23) cooperates with the forming seat (22), and their mating surfaces are multi-stage stepped and sealed by the mounting seat sealing ring (233).

9. The double-layer plastic-coated pilot valve according to claim 2, wherein, The control module (13) further includes a PCBA combination (131). The PCBA combination (131) includes a power connector (1312) and an indicator light (1313). The plastic cover plate (132) is sleeved on the power connector (1312) and the indicator light (1313), and is respectively in sealed cooperation with the power connector (1312) and the indicator light (1313).

10. The double-layer plastic-coated pilot valve according to claim 9, characterized in that, The plastic cover plate (132) includes positioning posts (1321). The PCBA combination (131) further includes a PCB board (1311). The coil assembly (12) further includes U-shaped frame side plates (1212). The positioning posts (1321) pass through the PCB board (1311) and the U-shaped frame side plates (1212) and are snap-connected.

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