LED structure of electromagnetic pilot operated valve

Abstract

The utility model relates to the technical field of electromagnetic pilot valves, in particular to a light-emitting diode (LED) structure of an electromagnetic pilot valve, which comprises a lining and a shell which are nested, the lining is positioned inside the shell, a pilot valve component and a printed circuit board (PCB) component are arranged inside the lining, the pilot valve component is connected with the PCB component through a square needle, and the PCB component is connected with the lining through a connecting rod. The cover plate assembly is connected with the pilot valve assembly, the PCB assembly is provided with a power source inserting piece and an LED lamp bead, and the power source inserting piece and the LED lamp bead are arranged in the cover plate assembly and the shell in a penetrating mode. According to the utility model, the PCB assembly and the cover plate assembly are arranged in the housing and the lining through integrated plastic coating, so that the integrity and the dustproof and waterproof performance of equipment are improved; the LED lamp beads are independently exposed out of the shell, so that the appearance of the device is simpler and more attractive; the plastic coating manufacturing process is lower in difficulty in valve manufacturing process, fewer in steps and higher in overall strength of equipment.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic pilot valve technology, and in particular to an LED structure for an electromagnetic pilot valve. Background Technology

[0002] An electromagnetic pilot valve is a type of pilot valve that combines electromagnetic drive and pilot control principles. It controls the pilot valve through the magnetic force generated by an electromagnetic coil. Currently, pilot valve indicator lights commonly use surface-mount LEDs, with a colored transparent plastic housing on the outside and either filled with a gel or left completely unfilled inside.

[0003] For example, Chinese patent CN201916266U discloses an intrinsically safe electromagnetic pilot valve for explosive gas environments. It includes a valve body and two identical two-position three-way pilot valve cores symmetrically arranged on the upper and lower sides of the horizontal centerline within the valve body. The right end of the valve body has a recessed cavity structure. The push rods of the two two-position three-way pilot valve cores extend horizontally into the cavity and connect to the end of a lever. Two electromagnetic actuators are sealed at the right end of the valve body corresponding to the cavity position. Push rods are horizontally fixed to the armatures of the two electromagnetic actuators, extending to positions contacting the lever. A mounting box is fixed to the electromagnetic actuator housing. An electromagnetic actuator control circuit board is sealed and fixed inside the mounting box with potting compound. A dustproof and waterproof intrinsically safe electrical socket and an electromagnetic actuator operation indicator light are provided on the side wall of the mounting box. This utility model uses a potting compound process to fill the mounting box, and its split structure results in poor overall compactness and inadequate dustproof and waterproof performance. Utility Model Content

[0004] To address the issues of poor indicator light display, inadequate dust and water resistance, and poor overall compactness in current electromagnetic pilot valves on the market, this utility model proposes a design that uses integrated plastic coating to fix the PCB board inside the electromagnetic pilot valve, and uses LED beads soldered onto the PCB board, with only the LED beads partially exposed outside the electromagnetic pilot valve shell, achieving a compact overall design and good dust and water resistance.

[0005] To achieve the above-mentioned technical effects, this utility model proposes:

[0006] An electromagnetic pilot valve LED structure includes a nested bushing and a housing, the bushing being located inside the housing, a pilot valve assembly and a PCB assembly being disposed inside the bushing, the pilot valve assembly being connected to the PCB assembly via a guide, and a cover plate assembly being connected to the pilot valve assembly. The PCB assembly is provided with a power connector and an LED bead, the power connector and the LED bead being disposed within the cover plate assembly and the housing.

[0007] The double-layer nested structure of bushing and housing improves dust protection. The pilot valve assembly, PCB assembly and cover plate assembly are located inside the bushing. The cover plate assembly fixes the PCB assembly a second time and protects the LED beads from damage caused by high-temperature particles during the process of plastic wrapping the bushing and housing.

[0008] The pilot valve assembly includes an enameled wire coil, with both ends of the coil connected to a U-shaped frame via a wire frame. The U-shaped frame is connected to a U-shaped frame cover plate, which in turn is connected to a cover plate assembly. The PCB assembly is located between the cover plate assembly and the U-shaped frame cover plate. The U-shaped frame enhances the overall strength of the electromagnetic pilot valve, and the U-shaped frame cover plate serves as an intermediate connector to the cover plate assembly, further securing the PCB assembly.

[0009] The guide connects the enameled wire coil and forms a circuit.

[0010] The cover plate assembly includes a receiving plate, on which are provided lamp bead holes and insert holes. The lamp beads pass through the lamp bead holes, and the power insert passes through the insert holes.

[0011] The cover assembly also includes a plug holder and two connecting rods, the connecting rods passing through the U-shaped cover, and the top of the power plug located inside the plug holder.

[0012] The receiving plate includes an inner receiving plate and an outer receiving plate that are fitted together. The area of ​​the inner receiving plate is larger than that of the outer receiving plate. The inner receiving plate is embedded inside the bushing, and the outer receiving plate is embedded inside the outer shell. There is a stepped structure between the inner and outer receiving plates, which further secures the cover plate assembly during the subsequent plastic coating process of the bushing and the outer shell.

[0013] The top of the LED bead is located outside the housing.

[0014] The bushing and the outer shell are integrally molded with plastic.

[0015] It also includes a valve body, which is fixedly connected to the housing by screws.

[0016] The beneficial effects of this utility model are:

[0017] 1. The PCB assembly and cover plate assembly are placed inside the shell and bushing with integrated plastic coating, which improves the overall integrity and dust and water resistance of the equipment; 2. The LED beads are exposed separately in the shell, making the equipment look simpler and more beautiful; 3. The plastic coating manufacturing process is less difficult and has fewer steps in valve manufacturing, resulting in higher overall equipment strength. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the pilot valve assembly.

[0019] Figure 2 This is a side view of the pilot valve assembly.

[0020] Figure 3 A schematic diagram of the overall structure of the cover plate assembly. Figure 1 .

[0021] Figure 4 A schematic diagram of the overall structure of the cover plate assembly. Figure 2 .

[0022] Figure 5 This is a structural diagram of a PCB assembly.

[0023] Figure 6 This is a schematic diagram of the bushing structure.

[0024] Figure 7 This is a schematic diagram of the outer shell.

[0025] Figure 8 This is a schematic diagram of the structure connecting the outer shell to the valve body.

[0026] Icon labels:

[0027] 100. Housing; 200. Bushing; 300. Pilot valve assembly; 400. PCB assembly; 500. Cover plate assembly; 600. Valve body;

[0028] 301. Wire rod; 302. Enamelled wire coil; 303. U-shaped frame; 304. U-shaped frame cover plate; 305. Wire frame; 401. LED lamp bead; 402. Power connector; 501. Receiving plate; 502. Lamp bead hole; 503. Connecting pin hole; 504. Connecting rod; 505. Connecting pin bracket; 506. Inner receiving plate; 507. Outer receiving plate; 508. Support column; Detailed Implementation

[0029] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0030] Example 1

[0031] In existing technologies, the PCB board of an electromagnetic pilot valve is connected to the valve housing using a potting process. LED indicator lights are typically surface-mount connected, and a transparent plastic cover is used to fasten to the PCB board, providing dust and water protection while facilitating indicator light observation. However, the surface-mount LED indicator light structure in existing technologies has poor waterproofing, leaving a risk of water splashing into the PCB cover. The potting process and subsequent connection to the PCB cover are complex, resulting in poor overall integrity and aesthetics of the electromagnetic pilot valve. This embodiment proposes a plastic-coating process to encapsulate the PCB board within the housing, along with a cover assembly to protect the PCB board. LED beads are soldered in, with the tops of the LED beads exposed within the housing, improving valve integrity, dust and water resistance, and enhancing appearance. This embodiment provides an LED structure for an electromagnetic pilot valve; the preferred embodiment of this structure is described below.

[0032] Reference Appendix Figure 1 and 2 In this embodiment, the electromagnetic pilot valve LED structure includes a pilot valve assembly 300 and a PCB assembly 400. The pilot valve assembly 300 includes an enameled wire coil 302, with wire frames 305 at both ends of the enameled wire coil 302. One end of the wire frame 305 has a guide 301, and the two guides 301 are connected to the enameled wire coil 302 to form a circuit. The guide 301 is made of gold-plated copper sheet by stamping. The PCB assembly 400 includes a PCB board, i.e., LED beads 401 soldered on the PCB board, and a power connector 402 to control the enameled wire coil. The circuit components energized by coil 302 include LED beads 401, which are high-brightness models with 0603 packages. The guide 301 is soldered to the PCB board. U-shaped frames 303 are connected to both ends of the enameled wire coil 302. One end of the U-shaped frame 303 has a through hole, and one of the wire frames 305 passes through the through hole. The other end of the U-shaped frame 303 is snapped into the wire frame 305 with the guide 301. A U-shaped frame cover plate 304 is connected to both ends of the U-shaped frame 303. The U-shaped frame cover plate 304 has two through holes for connecting the cover plate assembly 500.

[0033] Reference Appendix Figure 3 and 4The cover plate assembly 500 includes a receiving plate 501. The receiving plate 501 has a plug hole 503 for inserting the power plug 402 and a lamp bead hole 502 for inserting the LED lamp bead 401. One side of the receiving plate 501 is provided with two connecting rods 504 and two support columns 508. The ends of the two connecting rods 504 have a snap-fit ​​structure. The two connecting rods 504 are correspondingly arranged with the through holes on the U-shaped frame cover plate 304. The cover plate assembly 500 is connected to the U-shaped frame cover plate 304 through the two connecting rods 504. The two support columns 508 abut against the PCB board of the PCB assembly 400, making the structure between the PCB assembly 400 and the cover plate assembly 500 more stable. On the other side of the receiving plate 501, there is a plug baffle 505. The plug baffle 505 is arranged around the plug hole 503 to protect the power plug 402 and stabilize the interface connected to the plug.

[0034] Reference Appendix Figure 6 and 7 A bushing 200 and a housing 100 are integrally molded around the pilot valve assembly 300 and the PCB assembly 400, respectively. The bushing 200 completely encloses the pilot valve assembly 300 and the PCB assembly 400. The bushing 200 is made of high-temperature resistant engineering plastic and is injection molded to cover the pilot valve assembly and the PCB assembly 400, and also covers a portion of the support plate near the pilot valve assembly 300. The housing 100 completely encloses the bushing 200 and covers the portion of the cover plate assembly 500 away from the pilot valve assembly 300. At the same time, a portion of the LED bead 401 is exposed outside the housing 100 to indicate the operating status of the PCB assembly 400 and the pilot valve assembly 300, and whether they are working properly.

[0035] The assembly process of this embodiment is as follows: the wound enameled wire coil 302 is connected to the wire frame 305 and the guide 301 is installed so that the two guides 301 and the enameled wire coil 302 form a circuit. The U-shaped frame 303 is connected to the wire frame 305. The U-shaped frame cover plate 304 is connected to the U-shaped frame 303. The PCB assembly 400 is soldered to the guide 301. The cover plate assembly 500 is connected to the U-shaped frame cover plate 304. The connected components are plastic coated to form a bushing 200. After plastic coating, the outer shell 100 is formed. The two-step plastic coating process reduces the shrinkage rate of the product.

[0036] This embodiment improves the dust and water resistance of the pilot valve assembly 300 and PCB assembly 400 by using a plastic-coated bushing 200 and a housing 100. At the same time, it exposes the LED beads 401, improving the compactness of the electromagnetic pilot valve and enabling the LED indicator to transmit the working status of the pilot valve assembly 300 and PCB assembly 400.

[0037] Example 2

[0038] This embodiment provides an LED structure for an electromagnetic pilot valve. The preferred embodiment of the LED structure for the electromagnetic pilot valve is described below. (See attached document.) Figures 1 to 5 In this embodiment, the electromagnetic pilot valve LED structure includes a nested bushing 200 and a housing 100. The bushing 200 is located inside the housing 100, and a pilot valve assembly 300 and a PCB assembly 400 are disposed inside the bushing 200. The pilot valve assembly 300 is welded to the PCB assembly 400 via a guide 301. It also includes a cover plate assembly 500 connected to the pilot valve assembly 300. The PCB assembly 400 has a power connector 402 and an LED bead 401, which are inserted through the cover plate assembly 500 and the housing 100. The top of the LED bead 401 is located outside the housing 100. The bushing 200 and the housing 100 are integrally molded together.

[0039] The pilot valve assembly 300 includes an enameled wire coil 302, which is made of 0.2mm enameled copper wire wound 1200 turns. The guide 301 connects to the enameled wire coil 302 to form a circuit. The two ends of the enameled wire coil 302 are connected to a U-shaped frame 303 through a wire frame 305. The U-shaped frame 303 is made of cold-rolled steel plate and stamped to improve the overall strength of the pilot valve assembly 300. The U-shaped frame 303 is connected to a U-shaped frame cover plate 304. The U-shaped frame cover plate 304 has two through holes for connecting the cover plate assembly 500. The PCB assembly 400 is located between the cover plate assembly 500 and the U-shaped frame cover plate 304. The cover assembly 500 is injection molded from flame-retardant PBT material. The cover assembly 500 includes a receiving plate 501, which has insertion holes 503 for power connectors 402 and LED beads 401 insertion holes 502. The LED beads are inserted into the LED beads 502, and the power connectors 402 are inserted into the insertion holes 503. The cover assembly 500 also includes a connector baffle 505 and two connecting rods 504. The connecting rods 504 are inserted into the U-shaped frame 303 cover, and the top of the power connector 402 is located inside the connector baffle 505. The receiving plate 501 includes an inner receiving plate 506 and an outer receiving plate 507 that fit together. The area of ​​the inner receiving plate 506 is larger than that of the outer receiving plate 507. The inner receiving plate 506 is embedded inside the bushing 200, and the outer receiving plate 507 is embedded inside the outer shell 100.

[0040] Reference Appendix Figure 6 and 7The bushing 200 and the outer shell 100 are coated with plastic one after the other. The bushing 200 is connected to the edge of the inner support plate 506, and the bushing 200 and the inner support plate 506 form the same outer surface. The outer shell 100 is connected to the edge of the outer support plate 507, and the outer shell 100 and the outer support plate 507 form the same outer surface. Since the area of ​​the inner support plate 506 is larger than the area of ​​the outer support plate 507, and the inner support plate 506 and the outer support plate 507 are fitted together and the outer support plate 507 is centered, the inner support plate 506 and the outer support plate 507 form a stepped structure. After the outer shell 100 is coated with plastic, the connection of the cover plate assembly 500 is more stable, and the dustproof and waterproof performance of the electromagnetic pilot valve is better.

[0041] The bushing 200 has a mold fixing hole for stabilizing it in the injection mold during the secondary plastic coating process of the outer shell 100; the inner support plate 506 and the outer support plate 507 of the support plate 501 are connected by the bushing 200 and the outer shell 100 respectively through plastic coating, which makes the connection of the cover plate assembly 500 more stable; the LED bead hole 502 of the cover plate assembly 500 protects the lower part of the LED bead 401 during the plastic coating process, preventing high-temperature particles from damaging the LED bead 401.

[0042] Example 3

[0043] This embodiment provides an LED structure for an electromagnetic pilot valve. The preferred embodiment of the LED structure for the electromagnetic pilot valve is described below. (See attached document.) Figures 1 to 5 In this embodiment, the electromagnetic pilot valve LED structure includes a nested bushing 200 and a housing 100. The bushing 200 is located inside the housing 100, and a pilot valve assembly 300 and a PCB assembly 400 are disposed inside the bushing 200. The pilot valve assembly 300 is soldered to the PCB assembly 400 via a guide 301. It also includes a cover plate assembly 500 connected to the pilot valve assembly 300. The PCB assembly 400 has a power connector 402 and an LED bead 401, which are inserted through the cover plate assembly 500 and the housing 100. The top of the LED bead 401 is located outside the housing 100. The bushing 200 and the housing 100 are integrally molded with plastic. (See attached diagram.) Figure 6 and 7 It also includes a valve body 600, which is fixedly connected to the housing 100 by screws.

[0044] The pilot valve assembly 300 includes an enameled wire coil 302, which is made of 0.2mm enameled copper wire wound 1200 turns. The guide 301 connects to the enameled wire coil 302 to form a circuit. The two ends of the enameled wire coil 302 are connected to a U-shaped frame 303 through a wire frame 305. The U-shaped frame 303 is made of cold-rolled steel plate and stamped to improve the overall strength of the pilot valve assembly 300. The U-shaped frame 303 is connected to a U-shaped frame cover plate 304. The U-shaped frame cover plate 304 has two through holes for connecting the cover plate assembly 500. The PCB assembly 400 is located between the cover plate assembly 500 and the U-shaped frame cover plate 304. The cover assembly 500 is injection molded from flame-retardant PBT material. The cover assembly 500 includes a receiving plate 501, which has insertion holes 503 for power connectors 402 and LED beads 401 insertion holes 502. The LED beads are inserted into the LED beads 502, and the power connectors 402 are inserted into the insertion holes 503. The cover assembly 500 also includes a connector baffle 505 and two connecting rods 504. The connecting rods 504 are inserted into the U-shaped frame 303 cover, and the top of the power connector 402 is located inside the connector baffle 505. The receiving plate 501 includes an inner receiving plate 506 and an outer receiving plate 507 that fit together. The area of ​​the inner receiving plate 506 is larger than that of the outer receiving plate 507. The inner receiving plate 506 is embedded inside the bushing 200, and the outer receiving plate 507 is embedded inside the outer shell 100.

[0045] The pilot valve assembly 300 also includes components such as a valve core, spring, and guide sleeve that pass through the enameled wire coil 302, used to realize the basic function of the pilot valve. The housing 100 has two through holes for bolts to pass through and connect to the valve body 600. The pilot valve assembly 300 and the valve body 600 cooperate to realize the function of the electromagnetic pilot valve.

[0046] Example 4

[0047] Reference Appendix Figures 1 to 7 In this embodiment, the overall structure of the electromagnetic pilot valve LED structure includes a nested bushing 200 and a metal shell 100. The bushing 200 and the shell 100 are formed by two plastic coating processes. Both the bushing 200 and the shell 100 are made of high-temperature resistant engineering plastic and are formed by injection molding. The bushing 200 has a cylindrical cavity inside, and the pilot valve assembly 300 and the PCB assembly 400 are installed in sequence in the cavity. The enameled wire coil 302 of the pilot valve assembly 300 is electrically connected to the control circuit of the PCB assembly 400 through the guide 301. The guide 301 is made of gold-plated copper sheet stamping.

[0048] The PCB assembly 400 adopts a double-layer FR-4 substrate design, with LED beads 401 and power connectors 402 soldered on the surface. The LED beads 401 can display two colors, red and green, to indicate equipment failure and normal operation, respectively. The LED beads 401 are high-brightness models with 0603 packages. The PCB assembly 400 is equipped with power connectors 402, which are L-shaped copper alloy stamped parts, and their vertical sections are fixed to the PCB assembly 400 by reflow soldering. The cover plate assembly 500 is connected to the U-shaped frame cover plate 304 of the pilot valve assembly 300. The cover plate assembly 500 is injection molded from flame-retardant PBT material. The PCB assembly 400 is located between the cover plate assembly 500 and the U-shaped frame cover plate 304. The cover plate assembly 500 is also injection molded from flame-retardant PBT material and includes an integrally molded receiving plate 501, a insert bracket 505, and a connecting rod 504. The receiving plate 501 has a 3mm diameter LED bead hole 502 and a 2.5mm wide insert hole 503. During installation, the PCB assembly 400 is first positioned on the surface of the U-shaped frame cover plate 304, and then mechanically fixed by the connecting rod 504 passing through the positioning hole of the U-shaped frame cover plate 304.

[0049] Reference Appendix Figure 8 The valve body 600 is connected to the housing 100 by bolts. The housing 100 has through holes for bolts to pass through. The internal cavity of the valve body 600 and the pilot valve assembly 300 together realize the function of the electromagnetic pilot valve. The valve body 600, housing 100 and bushing 200 are all injection molded from flame-retardant PBT material.

[0050] In this embodiment, the electromagnetic pilot valve LED structure encapsulates the PCB board in a plastic shell and includes a cover plate assembly to protect the PCB board. It employs soldered LED beads with the tops of the LED beads exposed in the shell, improving the valve's overall integrity, dust and water resistance, and aesthetic appearance.

[0051] The above description is a preferred embodiment of the present utility model, used to illustrate the present utility model and its effects. It should be noted that, for those skilled in the art, for the purpose of making foreseeable improvements and modifications without departing from the principles of the present utility model, such improvements and modifications are also within the protection scope of the present utility model.

Claims

1. An LED structure for an electromagnetic pilot valve, characterized in that, The device includes a nested bushing and a housing, with the bushing located inside the housing. The bushing contains a pilot valve assembly and a PCB assembly, with the pilot valve assembly connected to the PCB assembly via a guide. It also includes a cover plate assembly connected to the pilot valve assembly. The PCB assembly has a power connector and an LED bead, which are inserted through the cover plate assembly and the housing.

2. The electromagnetic pilot valve LED structure according to claim 1, characterized in that, The pilot valve assembly includes an enameled wire coil, the two ends of which are connected to a U-shaped frame via a wire frame. The U-shaped frame is connected to a U-shaped frame cover plate, and the U-shaped frame cover plate is connected to a cover plate assembly. The PCB assembly is located between the cover plate assembly and the U-shaped frame cover plate.

3. The electromagnetic pilot valve LED structure according to claim 2, characterized in that, The guide connects the enameled wire coil and forms a circuit.

4. The electromagnetic pilot valve LED structure according to claim 2, characterized in that, The cover plate assembly includes a receiving plate, on which are provided lamp bead holes and insert holes. The lamp beads pass through the lamp bead holes, and the power insert passes through the insert holes.

5. The electromagnetic pilot valve LED structure according to claim 4, characterized in that, The cover assembly also includes a plug holder and two connecting rods, the connecting rods passing through the U-shaped cover, and the top of the power plug located inside the plug holder.

6. The electromagnetic pilot valve LED structure according to claim 5, characterized in that, The receiving plate includes an inner receiving plate and an outer receiving plate that are fitted together. The area of ​​the inner receiving plate is larger than that of the outer receiving plate. The inner receiving plate is embedded inside the bushing, and the outer receiving plate is embedded inside the outer shell.

7. The electromagnetic pilot valve LED structure according to claim 1, characterized in that, The top of the LED bead is located outside the housing.

8. The electromagnetic pilot valve LED structure according to claim 1, characterized in that, The bushing and the outer shell are integrally molded with plastic.

9. An electromagnetic pilot valve LED structure according to any one of claims 1 to 8, characterized in that, It also includes a valve body, which is fixedly connected to the housing by screws.

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