A pilot operated solenoid valve

Abstract

The application discloses a pilot electromagnetic valve and relates to the field of electromagnetic valves, which comprises a main valve and a pilot valve assembly connected to the main valve, the pilot valve assembly comprising a first pilot valve and a second pilot valve, the first pilot valve and the second pilot valve being formed with a control air path, the first pilot valve and the second pilot valve controlling the control air path to form a pressure difference at both ends of a valve rod of the main valve; the second pilot valve is detachably connected to the first pilot valve in close proximity; the first pilot valve is provided with a first mounting cavity for mounting a manual rod, and the second pilot valve is provided with a second mounting cavity for mounting the manual rod; a first insertion slot is arranged on a side wall of the first mounting cavity, a second insertion slot is arranged on a side wall of the second mounting cavity, the first insertion slot and the second insertion slot are oppositely arranged and communicate with each other, and a locking plate for limiting the manual rod is arranged in the first insertion slot and the second insertion slot, and the opposite ends of the two locking plates abut against each other. The application has the advantages that the locking plates are convenient to process and disassemble, and are not easy to fall off after being mounted.

Description

Technical Field

[0001] This invention relates to the field of solenoid valves, and particularly to a pilot-operated solenoid valve. Background Technology

[0002] A pilot-operated solenoid valve consists of a main valve and a pilot valve. The pilot valve outputs pilot pressure, which then drives the main valve spool to switch directions. When the pilot-operated solenoid valve is energized or de-energized, the coil of the pilot valve generates an intermittent magnetic field, driving the moving iron core to reciprocate, changing the internal air path of the pilot valve, thereby changing the output direction of the pilot pressure and realizing the switching of the main valve spool.

[0003] Some existing pilot-operated solenoid valves control the switching of the pilot valve air path by alternating the operation of two pilot valves. Each pilot valve has a manual lever linked to a moving iron core. This manual lever is exposed to the outside, so even when the coil is not energized, manually pressing the lever moves the moving iron core, thus switching the pilot valve air path and consequently reversing the main valve stem.

[0004] In the aforementioned solenoid valve, a manual lever cover is installed on the valve seat of the pilot valve. When installing the manual lever, the lever is first installed inside the pilot valve, and then the manual lever cover is fixed above the lever. The lever is then restrained within the pilot valve seat by a barb groove on the cover. This structure requires high dimensional accuracy in the machining of the manual lever cover, which can easily lead to non-compliant finished products. Furthermore, once the manual lever cover is fixed, it cannot be disassembled for maintenance, resulting in wasted parts. In certain vibrating working environments, the manual lever cover may detach, affecting product quality. Summary of the Invention

[0005] To address the problems of high machining precision requirements, inconvenient disassembly and assembly, and risk of detachment in existing manual lever caps, the purpose of this invention is to provide a pilot-operated solenoid valve that is easy to machine and disassemble, and is not easily detached after installation.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: The present invention provides a pilot-operated solenoid valve, including a main valve and a pilot valve assembly connected to the main valve. The pilot valve assembly includes a first pilot valve and a second pilot valve. The first pilot valve and the second pilot valve form a control air passage that connects the two ends of the valve stem of the main valve. The first pilot valve and the second pilot valve control the control air passage to form a pressure difference at the two ends of the valve stem of the main valve to drive the valve core to move. The second pilot valve is connected adjacent to the first pilot valve on the side away from the main valve; the first pilot valve has a first mounting cavity for mounting a manual lever, and the second pilot valve has a second mounting cavity for mounting a manual lever; a first slot is provided on the side wall of the first mounting cavity, and a second slot is provided on the side wall of the second mounting cavity; the first slot and the second slot are arranged facing each other and communicating with each other; a locking plate for limiting the manual lever is provided in both the first slot and the second slot, and the two locking plates abut against each other at their opposite ends.

[0007] In this design, the pilot-operated solenoid valve controls the sliding of the main valve stem via a first pilot valve and a second pilot valve to switch the main valve's air path. The first and second pilot valves are detachably and adjacent to each other. Two locking plates are inserted into the first and second slots respectively from opposite sides of the first and second pilot valves. One locking plate, positioned in the first mounting cavity, limits the manual lever on the first pilot valve, while the other locking plate, positioned in the second mounting cavity, limits the manual lever on the second pilot valve. The opposing ends of the two locking plates abut against each other, ensuring stable installation in the first and second slots without wobbling. The two locking plates also have a symmetrical and aesthetically pleasing appearance. The locking plate structure is simple, easy to mold, and provides good limiting capability for the manual lever. Furthermore, the above installation method facilitates easy disassembly and maintenance of the locking plates, while ensuring a secure and reliable installation that prevents them from falling off. The adjacent connection of the first and second pilot valves also facilitates wiring, resulting in a simple and aesthetically pleasing wiring layout.

[0008] Preferably, the locking plate has a limiting notch on the side facing the manual lever, and the manual lever has a limiting protrusion on its periphery that can abut against the lower side of the locking plate, with at least a portion of the manual lever exposed to the outside through the limiting notch.

[0009] In this design, the manual lever is limited below the locking plate by a limiting protrusion, making it difficult for the manual lever to come out of the first or second mounting cavity; at least part of the manual lever is exposed to the outside through the limiting notch so that the user can operate the manual lever.

[0010] Preferably, the limiting protrusion includes a first limiting part and a second limiting part, the first limiting part and the second limiting part are offset from each other along the circumference of the manual lever, and the side of the first limiting part facing the locking plate is located above the second limiting part; The manual lever has: In the unlocked state, the second limiting part is offset from the limiting notch and is directly opposite the lower side of the locking plate, while the first limiting part is directly opposite the limiting notch and offset from the lower side of the locking plate; In the locked state, the first limiting part rotates to be offset from the limiting notch and directly opposite the lower side of the locking plate.

[0011] In this design, when the manual lever is in the unlocked state, the first limiting part is directly opposite the limiting notch and offset from the lower side of the locking plate. This means the first limiting part does not obstruct the axial movement of the manual lever. The manual lever is limited by the second limiting part, which is offset from the limiting notch, engaging with the locking plate. Since the side of the first limiting part facing the locking plate is above the second limiting part (i.e., the upper surface of the second limiting part is below the upper surface of the first limiting part), and there is a gap between the upper surface of the second limiting part and the locking plate, the user can drive the manual lever to move within the area between the second limiting part and the locking plate to control the movement of the main valve stem. When the manual lever is in the locked state, the first limiting part rotates to offset the limiting notch and directly opposite the lower side of the locking plate. At this time, the second limiting part is located a certain distance below the first limiting part, meaning the manual lever remains pressed down and locked at the locking plate.

[0012] Preferably, two first limiting parts are symmetrically arranged along the circumference of the manual lever, and two second limiting parts are symmetrically arranged along the circumference of the manual lever, with the two first limiting parts being continuously connected between the two second limiting parts.

[0013] In this design, two first limiting parts are provided along the circumference of the manual lever, and two second limiting parts are symmetrically provided along the circumference of the manual lever. This ensures that when either the first or second limiting part abuts against the locking plate, the two first limiting parts stably abut against the locking plate on both sides of the limiting notch, or the two second limiting parts stably abut against the locking plate on both sides of the limiting notch, making the locking plate's restraint on the manual lever more stable. The two first limiting parts are continuously connected between the two second limiting parts, meaning the first and second limiting parts are continuously connected along the circumference of the manual lever, facilitating the demolding and forming of the first and second limiting parts on the manual lever.

[0014] Preferably, a continuous and inclined guide slope extends between the opposing edges of the upper surfaces of the first limiting portion and the upper surfaces of the second limiting portion.

[0015] In this design, an inclined guide slope extends between the opposing edges of the upper surfaces of the first and second limiting parts, so that when the manual lever is rotated, the locking plate can slide and abut against the guide slope, thereby enabling the locking plate to stably switch between the states facing the first and second limiting parts. The manual lever can smoothly switch between the locked and unlocked states, making it convenient for users.

[0016] Preferably, the manual lever is provided with an anti-disengagement part above the limiting protrusion. The anti-disengagement part is located above the locking plate and exposed to the outside. The anti-disengagement part extends outside the limiting notch and faces the upper side of the locking plate.

[0017] In this design, the manual lever is limited by the locking plate through the anti-disengagement part, making it difficult for the manual lever to disengage from the limiting notch when pressed down, thus ensuring the stability of the manual lever during use.

[0018] Preferably, the manual lever includes an upper cover and a lower cover, the limiting protrusion is disposed on the periphery of the upper cover, the upper cover is rotatably connected to the upper part of the lower cover, and the lower cover abuts against a return spring.

[0019] In this design, the manual lever is designed with a separate upper and lower cover. The lower cover abuts against a return spring, so that when the external force pressing on the manual lever is removed in the unlocked state, the manual lever can automatically reset under the drive of the return spring. The upper cover is rotatably connected to the lower cover, so that when the upper cover is rotated to switch the manual lever between the locked and unlocked states, the lower cover will not rotate with the upper cover. This ensures that the return spring and other components installed under the lower cover are not affected by the rotation of the upper cover, which is beneficial to the stable operation of the manual lever.

[0020] Preferably, the pilot-operated solenoid valve further includes a connecting screw, which passes through the first pilot valve and the second pilot valve and is threaded to the main valve; The first pilot valve has a positioning recess on the side facing the second pilot valve, and the second pilot valve has a positioning protrusion on the side facing the first pilot valve that matches the positioning recess.

[0021] In this design, the first and second pilot valves are positioned by a positioning recess and a positioning protrusion, facilitating their connection. The first and second pilot valves are fixed to the main valve by connecting screws, allowing for easy assembly and disassembly, and consequently, convenient installation of the locking plate.

[0022] Preferably, the control air path includes an inlet air path, an exhaust air path, a first outlet air path, and a second outlet air path. The inlet air path is connected to a pressure source, the exhaust air path is connected to the outside, the first outlet air path is connected to the cavity outside the first end of the valve stem of the main valve, and the second outlet air path is connected to the cavity outside the second end of the valve stem of the main valve. Both the first pilot valve and the second pilot valve have a solenoid valve core assembly. The solenoid valve core assembly of the first pilot valve can control the first outlet airflow path to connect to the inlet airflow path or to connect to the exhaust airflow path. The solenoid valve core assembly of the second pilot valve can control the second outlet airflow path to connect to the inlet airflow path or to connect to the exhaust airflow path.

[0023] In this scheme, when the first pilot valve controls the first outlet airflow path to connect with the inlet airflow path through its solenoid valve core assembly, and the second pilot valve controls the second outlet airflow path to connect with the exhaust airflow path through its solenoid valve core assembly, the compressed gas from the gas source enters the cavity outside the first end of the main valve stem via the inlet airflow path and the first outlet airflow path, thereby creating a pressure difference across the two ends of the main valve stem and driving the main valve stem to move from the first end towards the second end. When the first pilot valve controls the first outlet airflow path to connect with the exhaust airflow path through its solenoid valve core assembly, and the second pilot valve controls the second outlet airflow path to connect with the inlet airflow path through its solenoid valve core assembly, the compressed gas enters the cavity outside the second end of the main valve stem via the inlet airflow path and the second outlet airflow path, thereby driving the main valve stem to move from the second end towards the first end. Thus, by controlling the first and second outlet airflow paths to connect with the inlet and outlet airflow paths respectively through the two solenoid valve core assemblies, the valve stem can be moved to achieve the switching of the main valve's airflow path.

[0024] Preferably, the first pilot valve further comprises a first working chamber, which is connected to the first mounting chamber via a connecting chamber; a first exhaust port connected to the exhaust flow path is provided on the lower side of the first mounting chamber, and the first exhaust flow path is connected to the first mounting chamber; a first air inlet connected to the air inlet flow path is provided on the upper side of the first working chamber. The moving iron core of the solenoid valve core assembly of the first pilot valve is connected to an iron core sealing head. The manual lever is connected to a bracket, and a bracket sealing head is fixed on the bracket. The end of the bracket away from the manual lever passes through the connecting cavity and is connected to the moving iron core. When the moving iron core moves, it can drive the iron core sealing head to move to open or close the first air inlet, and drive the bracket sealing head to move to close or open the first exhaust port. In this design, the bracket sealing head is linked to the moving iron core via the bracket. When the solenoid valve core assembly drives the moving iron core to move, it can drive the iron core sealing head, the bracket, and the bracket sealing head on the bracket to move. When the iron core sealing head moves downward to open the first air inlet, the bracket sealing head moves downward simultaneously to close the first exhaust port. Compressed gas enters the first air outlet through the air inlet path, the first air inlet, the first working chamber, the connecting chamber, and the first mounting chamber. When the iron core sealing head moves upward to block the first air inlet, the bracket sealing head moves upward to leave the first exhaust port, and the first air outlet connects to the exhaust path via the first mounting chamber and the first exhaust port. This achieves the switching of the first air outlet path between being connected to the air inlet path and being connected to the air outlet path by controlling the solenoid valve core assembly.

[0025] In summary, the present invention has the following beneficial effects: In this invention, the first pilot valve and the second pilot valve are detachably arranged adjacent to each other. Two locking plates are inserted into the first slot and the second slot respectively from opposite sides of the first and second pilot valves. One locking plate, positioned within the first mounting cavity, limits the manual lever on the first pilot valve, while the other locking plate, positioned within the second mounting cavity, limits the manual lever on the second pilot valve. The opposite ends of the two locking plates abut against each other, ensuring stable installation in the first and second slots without easy movement. The locking plates have a simple structure, are easy to form, and provide good limiting capability for the manual lever. Furthermore, the above installation method makes the locking plates easy to assemble and disassemble, facilitating maintenance. Simultaneously, the locking plates are securely and reliably installed, preventing them from easily falling off. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural schematic diagram of a pilot-operated solenoid valve according to an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the lower side of a pilot-operated solenoid valve according to an embodiment of the present invention.

[0028] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at point AA.

[0029] Figure 4 This is an exploded structural diagram of the pilot component in a pilot-operated solenoid valve according to an embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of a vertical cross-sectional structure through the center of the pilot component according to an embodiment of the present invention.

[0031] Figure 6 This is a schematic diagram of the pilot assembly facing the main valve side according to an embodiment of the present invention.

[0032] Figure 7 yes Figure 6 Schematic diagram of the cross-sectional structure at point BB-.

[0033] Figure 8 yes Figure 3 Schematic diagram of the cross-sectional structure at point CC.

[0034] Figure 9 yes Figure 5 Schematic diagram of the cross-sectional structure at point DD.

[0035] Figure 10 This is a three-dimensional structural diagram of the locking plate and manual lever according to an embodiment of the present invention.

[0036] Figure 11 This is an exploded structural diagram of the locking plate and manual lever according to an embodiment of the present invention.

[0037] In the picture: 1000, Pilot-operated solenoid valve; 100, Main valve; 110, Valve body; 111, Air inlet; 112, Exhaust port; 120, Valve stem; 121, Piston; 130, Valve chamber; 141, Left exhaust port; 142, Left working port; 143, Main air inlet; 144, Right working port; 145, Right exhaust port; 150, First drive flow path; 200, First pilot valve; 210, Positioning recess; 220, First mounting cavity; 221, First exhaust port; 230, First working cavity; 231, First air inlet; 240, First slot; 300, Second pilot valve; 310, Positioning protrusion; 320, Second mounting cavity; 321, Second exhaust port; 330, Second working cavity; 331, Second air inlet; 340, Second slot; 400, Control air path; 410, Inlet Airflow path; 411, First intake chamber; 412, Second intake chamber; 420, Exhaust flow path; 421, First exhaust chamber; 422, Second exhaust chamber; 430, First exhaust flow path; 440, Second exhaust flow path; 450, Connecting chamber; 500, Connecting screw; 600, Manual lever; 610, O-ring; 620, Top cover; 621, First limiting part; 622, Second limiting part; 623, Guide slope; 624, Anti-detachment part; 630, Lower cover; 640, Return spring; 700, Solenoid valve core assembly; 710, Coil; 711, Pin; 720, Coil frame; 730, Fixed iron core; 740, Moving iron core; 750, Compression spring; 760, Iron core sealing head; 800, Bracket; 810, Bracket sealing head; 900, Locking plate; 910, Limiting notch. Detailed Implementation

[0038] The invention will now be further described with reference to the accompanying drawings.

[0039] In this embodiment, a coordinate system XYZ is set, where the positive direction of the Z-axis represents the top, the negative direction of the Z-axis represents the bottom, the positive direction of the Y-axis represents the front, the negative direction of the Y-axis represents the back, the positive direction of the X-axis represents the right, and the negative direction of the X-axis represents the left.

[0040] It should be noted that the directional terms such as left, right, up, down, front, and back used in the embodiments are only relative concepts or are based on the normal use of the product, and should not be considered as restrictive.

[0041] This embodiment discloses a pilot-operated solenoid valve 1000, referring to... Figure 1 The pilot-operated solenoid valve 1000 includes a main valve 100 and a pilot valve assembly connected to the main valve 100. The main valve 100 is used to connect the pneumatic component and the air source to supply air to the pneumatic component. The pilot valve assembly is used to control the main valve 100 to switch the air path.

[0042] Reference Figure 2 and Figure 3The main valve 100 includes a valve body 110 and a valve stem 120. A valve cavity 130 is formed within the valve body 110, and multiple air ports communicating with the valve cavity 130 are provided on the valve body 110. Pistons 121 are provided at both ends of the valve stem 120, and sealing rings are provided on the periphery of the valve stem 120 at the edges of the corresponding air ports. Specifically, in this embodiment, the pilot-operated solenoid valve 1000 is a two-position five-way solenoid valve with five air ports, which, along the direction closest to the pilot valve assembly, are sequentially a left exhaust port 141, a left working port 142, a main air inlet port 143, a right working port 144, and a right exhaust port 145. Furthermore, in other embodiments, the pilot-operated solenoid valve 1000 can also be other suitable solenoid valves.

[0043] Reference Figures 1 to 3 The pilot valve assembly includes a first pilot valve 200 and a second pilot valve 300. The first pilot valve 200 is fixedly connected to the right end cap of the valve body 110 of the main valve 100. The second pilot valve 300 is connected adjacent to the first pilot valve 200 on the side away from the main valve 100, thereby facilitating the wiring of the first pilot valve 200 and the second pilot valve 300. The first pilot valve 200 and the second pilot valve 300 form a control air passage 400 that connects the cavities at both ends of the valve stem 120 of the main valve 100. The first pilot valve 200 and the second pilot valve 300 create a pressure difference at both ends of the valve stem 120 of the main valve 100 through the control air passage 400 to drive the valve core to move.

[0044] Reference Figure 3 and Figure 4 The first pilot valve 200 has a positioning recess 210 on the side facing the second pilot valve 300, and the second pilot valve 300 has a positioning protrusion 310 on the side facing the first pilot valve 200, which mates with the positioning recess 210. The first pilot valve 200 and the second pilot valve 300 are positioned together by the positioning recess 210 and the positioning protrusion 310, facilitating the connection between the first pilot valve 200 and the second pilot valve 300. In this embodiment, the pilot-operated solenoid valve 1000 also includes two parallel connecting screws 500, which pass through the first pilot valve 200 and the second pilot valve 300 and are threaded to the main valve 100, thereby facilitating the assembly and disassembly of the first pilot valve 200 and the second pilot valve 300. In other embodiments, the first pilot valve 200 and the second pilot valve 300 can also be detachably connected by other suitable methods such as snap-fit ​​or pin connection.

[0045] Reference Figures 3 to 7The control air path 400 includes an inlet air path 410, an exhaust air path 420, a first outlet air path 430, and a second outlet air path 440. The inlet air path 410 is connected to an external air pressure source, and the exhaust air path 420 is connected to the outside. The first outlet air path 430 is connected to the cavity outside the first end of the valve stem 120 of the main valve 100, and the second outlet air path 440 is connected to the cavity outside the second end of the valve stem 120 of the main valve 100. The first pilot valve 200 can control the first outlet air path 430 to connect to the inlet air path 410 or to the exhaust air path 420, and the second pilot valve 300 can control the second outlet air path 440 to connect to the inlet air path 410 or to the exhaust air path 420.

[0046] When the first pilot valve 200 controls the first outlet airflow path 430 to connect to the inlet airflow path 410, and the second pilot valve 300 assembly controls the second outlet airflow path 440 to connect to the exhaust airflow path 420, the compressed gas from the gas source enters the cavity outside the piston 121 at the first end of the valve stem 120 of the main valve 100 through the inlet airflow path 410 and the first outlet airflow path 430. At the same time, the gas in the cavity outside the piston 121 at the second end of the valve stem 120 is discharged to the outside through the second outlet airflow path 440 and the exhaust airflow path 420, thereby forming a pressure difference at both ends of the valve stem 120 of the main valve 100, driving the valve stem 120 of the main valve 100 to move from the first end to the direction closer to the second end. When the first pilot valve 200 controls the first outlet gas flow path 430 to connect to the exhaust flow path 420, and the second pilot valve 300 controls the second outlet gas flow path 440 to connect to the inlet gas flow path 410, the compressed gas enters the cavity outside the piston 121 at the second end of the valve stem 120 of the main valve 100 through the inlet gas flow path 410 and the second outlet gas flow path 440. The gas in the cavity outside the piston 121 at the first end of the valve stem 120 is discharged through the first outlet gas flow path 430 and the exhaust flow path 420, thereby driving the valve stem 120 of the main valve 100 to move from the second end toward the first end.

[0047] In this embodiment, the first end refers to the end of the valve stem 120 away from the pilot valve assembly, and the second end refers to the end of the valve stem 120 closer to the pilot valve assembly. Furthermore, in other embodiments, the first and second ends may be the opposite of those referred to in this embodiment.

[0048] Specifically, refer to Figures 2 to 8 The right end cap of the valve body 110 of the main valve 100 is provided with an air inlet 111 and an air outlet 112. Both the air inlet 111 and the air outlet 112 are vertically arranged perpendicular to the length of the valve stem 120. The opening of the air inlet 111 is used to connect to the air source component, and the air inlet 111 is connected to the air inlet passage 410. The air outlet 112 is connected to the exhaust passage 420, and the end of the air outlet 112 away from the exhaust passage 420 is connected to the outside.

[0049] The main valve 100 forms a first drive flow path 150 connected to the outer cavity at the left end of the valve stem 120 and a second drive flow path (not shown in the figure) connected to the outer cavity at the right end of the valve stem 120. The first drive flow path 150 is connected to the first outlet flow path 430, and the second drive flow path is connected to the second outlet flow path 440.

[0050] Reference Figure 5 The intake air passage 410 includes a first intake chamber 411 disposed within the first pilot valve 200 and a second intake chamber 412 disposed within the second pilot valve 300. The first intake chamber 411 is disposed through both sides of the first pilot valve 200, with one end connected to the intake port 111 and the other end connected to the second intake chamber 412. The second intake chamber 412 is disposed through the left side of the second pilot valve 300, and the side of the second intake chamber 412 away from the first intake chamber 411 is closed.

[0051] The exhaust flow path 420 includes a first exhaust chamber 421 disposed within the first pilot valve 200 and a second exhaust chamber 422 disposed within the second pilot valve 300. The first exhaust chamber 421 extends through both sides of the first pilot valve 200, with one end connected to the exhaust port 112 and the other end connected to the second exhaust chamber 422. The second exhaust chamber 422 extends through the left side of the second pilot valve 300, with the side of the second exhaust chamber 422 away from the first exhaust chamber 421 closed. Thus, when the first pilot valve 200 and the second pilot valve 300 are joined, the first intake chamber 411 and the second intake chamber 412 are aligned and connected, and the first exhaust chamber 421 and the second exhaust chamber 422 are aligned and connected, thereby forming an intake flow path 410 and an exhaust flow path 420 within the pilot valve assembly.

[0052] Reference Figures 3 to 7 The first pilot valve 200 has a first mounting cavity 220 at its upper part and a first working cavity 230 at its lower part. The second pilot valve 300 has a second mounting cavity 320 at its upper part and a second working cavity 330 at its lower part. A manual lever 600 is axially slidably disposed in both the first mounting cavity 220 and the second mounting cavity 320. An O-ring 610 is fitted around the outer periphery of the manual lever 600 to seal the gap between the manual lever 600 and the first mounting cavity 220 or the second mounting cavity 320.

[0053] The first pilot valve 200 and the second pilot valve 300 each have a solenoid valve core assembly 700. The two solenoid valve assemblies are located in the first working chamber 230 and the second working chamber 330 respectively and seal the first working chamber 230 and the second working chamber 330.

[0054] The solenoid valve core assembly 700 includes a coil 710, a coil frame 720, a fixed iron core 730, and a moving iron core 740. The coil 710 is wound around the outside of the coil frame 720, the fixed iron core 730 is fixed inside the coil frame 720, and the moving iron core 740 is slidably disposed inside the coil frame 720. A compression spring 750 abuts against the fixed iron core 730 at one end of the moving iron core 740 near the fixed iron core 730, and an iron core sealing head 760 is connected to the other end of the moving iron core 740 away from the fixed iron core 730.

[0055] The coil frame 720 of the first pilot valve 200 is directly opposite the first working chamber 230, and the moving iron core 740 and the iron core sealing head 760 of the first pilot valve 200 extend into the first working chamber 230. The coil frame 720 of the second pilot valve 300 is directly opposite the second working chamber 330, and the moving iron core 740 and the iron core sealing head 760 of the second pilot valve 300 extend into the second working chamber 330.

[0056] Reference Figure 9 Each of the first pilot valve 200 and the second pilot valve 300 has a connecting cavity 450. The first working cavity 230 is connected to the first mounting cavity 220 through the connecting cavity 450, and the second working cavity 330 is connected to the second mounting cavity 320 through the connecting cavity 450. The first mounting cavity 220 has a first exhaust port 221 connected to the exhaust flow path 420 on its lower side, and the first working cavity 230 has a first air inlet 231 connected to the air intake flow path 410 on its upper side. The second mounting cavity 320 has a second exhaust port 321 connected to the exhaust flow path 420 on its lower side, and the second working cavity 330 has a second air inlet 331 connected to the air intake flow path 410 on its upper side. The first exhaust flow path 430 is connected to the first mounting cavity 220, and the second exhaust flow path 440 is connected to the second mounting cavity 320.

[0057] A bracket 800 is connected to the lower end of the manual lever 600, and a bracket 800 sealing head is fixed on the bracket 800. The end of the bracket 800 away from the manual lever 600 passes through the connecting cavity 450 and is connected to the moving iron core 740, so that the bracket 800 sealing head is linked with the moving iron core 740 through the bracket 800.

[0058] When the coil 710 in the first pilot valve 200 is energized, the moving iron core 740 moves downward, causing the sealing head of the iron core 740 to move downward and open the first air inlet 231. At the same time, it drives the iron core sealing head 760, the bracket 800, and the sealing head of the bracket 800 on the bracket 800 to move downward synchronously and close the first exhaust port 221. Compressed gas enters the first air outlet 430 through the air inlet passage 410, the first air inlet 231, the first working chamber 230, the connecting chamber 450, and the first mounting chamber 220.

[0059] When the coil 710 in the first pilot valve 200 is de-energized, the moving iron core 740 moves upward under the drive of the compression spring 750, the iron core sealing head 760 moves upward to block the first air inlet 231, and the bracket 800 sealing head moves upward to open the first exhaust port 221. The gas in the cavity on the left side of the valve stem 120 can be discharged through the first outlet airflow path 430, the first mounting cavity 220, the first exhaust port 221, and the exhaust flow path 420. This enables the solenoid valve core assembly 700 to control the first outlet airflow path 430 to switch between being connected to the inlet airflow path 410 and being connected to the outlet airflow path.

[0060] Similarly, in the second pilot valve 300, when the coil 710 is energized, the second exhaust port 321 is closed and the second air inlet 331 is opened, connecting the air inlet path 410, the second air inlet 331, the second working chamber 330, the connecting chamber 450, the second mounting chamber 320, and the second exhaust path 440; when the coil 710 is de-energized, the second air inlet 331 is closed and the second exhaust port 321 is opened, connecting the right end cavity of the valve stem 120, the second exhaust path 440, the second mounting chamber 320, the second exhaust port 321, and the exhaust path 420.

[0061] Therefore, when the coil 710 in the first pilot valve 200 is energized and the coil 710 in the second pilot valve 300 is de-energized, the compressed gas in the intake air passage 410 can enter the cavity at the left end of the valve stem 120, and the air in the cavity at the right end of the valve stem 120 can be discharged through the exhaust air passage 420, thereby driving the valve stem 120 to move to the right, causing the left working port 142 of the main valve 100 to discharge air and operate. When the coil 710 in the first pilot valve 200 is de-energized and the coil 710 in the second pilot valve 300 is energized, the compressed gas in the intake air passage 410 can enter the cavity at the right end of the valve stem 120, and the air in the cavity at the left end of the valve stem 120 can be discharged through the exhaust air passage 420, thereby driving the valve stem 120 to move to the left, causing the right working port 144 of the main valve 100 to discharge air and operate.

[0062] In this embodiment, since the first pilot valve 200 and the second pilot valve 300 are located on the same side, the two coil assemblies 700 are also located on the same side. This structural design allows the pins 711 at the bottom of the two coils 710 to be connected to the circuit board, controlling the pilot-operated solenoid valve 1000 to operate via a signal protocol, eliminating the need for wiring from the coil 710 end and reducing wiring time. Simultaneously, the dual-coil structure on the same side results in a uniform and neat appearance.

[0063] Reference Figure 4 and Figure 5The first mounting cavity 220 has a first slot 240 on its side wall, and the second mounting cavity 320 has a second slot 340 on its side wall. The first slot 240 extends radially along the first mounting cavity 220, and the second slot 340 extends radially along the second mounting cavity 320. The opposite ends of the first slot 240 and the second slot 340 respectively pass through the first pilot valve 200 and the second pilot valve and are interconnected. Locking plates 900 for limiting the manual lever 600 are provided in both the first slot 240 and the second slot 340.

[0064] Therefore, when installing the locking plate 900, before splicing the first pilot valve 200 and the second pilot valve 300, the two locking plates 900 can be inserted into the first slot 240 and the second slot 340 respectively from the opposite side of the first pilot valve 200 and the second pilot valve 300. Thus, one locking plate 900 is located in the first mounting cavity 220 and limits the manual lever 600 on the first pilot valve 200, and the other locking plate 900 is located in the second mounting cavity 320 and limits the manual lever 600 on the second pilot valve 300.

[0065] In this embodiment, the two locking plates 900 abut against each other at opposite ends, ensuring that the two locking plates 900 are stably installed in the first slot 240 and the second slot 340 without easily shaking. The locking plates 900 in this embodiment have a simple structure, are easy to form, provide good limiting capability for the manual lever 600, and, through the above installation method, are easy to assemble and disassemble, facilitating disassembly and maintenance. Simultaneously, the locking plates 900 are firmly and reliably installed, and are not easily detached.

[0066] Reference Figures 9 to 11 A limiting notch 910 is provided on the side of the locking plate 900 facing the manual lever 600 (i.e., the side where the two locking plates 900 are opposite to each other). A limiting protrusion is provided around the manual lever 600, which abuts against the lower side of the locking plate 900. The manual lever 600 is limited below the locking plate 900 by the limiting protrusion, making it difficult for the manual lever 600 to dislodge from the first mounting cavity 220 or the second mounting cavity 320. At least a portion of the manual lever 600 is exposed to the outside through the limiting notch 910, allowing the user to operate the manual lever 600.

[0067] The limiting protrusion includes a first limiting part 621 and a second limiting part 622. The first limiting part 621 and the second limiting part 622 are circumferentially offset along the manual lever 600 (the offset here means that the projections of the first limiting part 621 and the second limiting part 622 in the direction parallel to the axial direction of the manual lever 600 do not overlap). The side of the first limiting part 621 facing the locking plate 900 is located above the second limiting part 622.

[0068] In this embodiment, the manual lever 600 has two working states: an unlocked state and a locked state. When the manual lever 600 is in the unlocked state, the first limiting part 621 is directly opposite to the limiting notch 910 and offset from the lower side of the locking plate 900, that is, the first limiting part 621 will not block the axial movement of the manual lever 600. The second limiting part 622 is offset from the limiting notch 910 and is directly opposite the lower side of the locking plate 900. The manual lever 600 is limited by cooperating with the locking plate 900 through the second limiting part 622 offset from the limiting notch 910. Since the side of the first limiting part 621 facing the locking plate 900 is located above the second limiting part 622, that is, the upper surface of the second limiting part 622 is located below the upper surface of the first limiting part 621, there is a gap between the upper surface of the second limiting part 622 and the locking plate 900. The user can drive the manual lever 600 to move within the area between the second limiting part 622 and the locking plate 900 to control the movement of the valve stem 120 of the main valve 100.

[0069] When the manual lever 600 is in the locked state, the first limiting part 621 rotates to offset the limiting notch 910 and is directly opposite the lower side of the locking plate 900. At this time, the second limiting part 622 is located at a certain distance below the first limiting part 621, that is, the manual lever 600 is locked at the locking plate 900 in the downward state and cannot move upward.

[0070] In this embodiment, two first limiting parts 621 and two second limiting parts 622 are symmetrically arranged circumferentially along the manual lever 600. When the first limiting part 621 or the second limiting part 622 abuts against the locking plate 900 for limiting, the two first limiting parts 621 or the two second limiting parts 622 stably abut against the locking plate 900 on both sides of the limiting notch 910, making the locking plate 900's limiting of the manual lever 600 more stable. The two first limiting parts 621 are continuously connected between the two second limiting parts 622, that is, the first limiting parts 621 and the second limiting parts 622 are continuously connected circumferentially along the manual lever 600, facilitating the demolding of the first limiting parts 621 and the second limiting parts 622 on the manual lever 600.

[0071] In addition, in other embodiments, only one first limiting part 621 and one second limiting part 622 may be provided.

[0072] In addition, in other embodiments, the limiting protrusion may include only one of the first limiting portion 621 and the second limiting portion 622.

[0073] A continuous and inclined guide slope 623 extends between the opposing edges of the upper surfaces of the first limiting part 621 and the upper surfaces of the second limiting part 622. This allows the locking plate 900 to slide against the guide slope 623 when the manual lever 600 is rotated, thus enabling the locking plate 900 to stably switch between the states facing the first limiting part 621 and the second limiting part 622. The manual lever 600 can smoothly switch between the locked and unlocked states, making it convenient for the user.

[0074] The manual lever 600 has an anti-disengagement part 624 above the limiting protrusion. The anti-disengagement part 624 is located above the locking plate 900 and exposed to the outside. The anti-disengagement part 624 extends outside the limiting notch 910 and faces the upper side of the locking plate 900.

[0075] In this embodiment, the anti-detachment part 624 is disc-shaped, and its diameter is larger than the length or width of the limiting notch 910, preventing the anti-detachment part 624 from passing through the limiting notch 910 and entering below the locking plate 900. The manual lever 600 is limited by the anti-detachment part 624 on the locking plate 900, making it difficult for the manual lever 600 to disengage from the limiting notch 910 when pressed downwards, thus ensuring the stability of the manual lever 600 during use.

[0076] In this embodiment, the manual lever 600 includes an upper cover 620 and a lower cover 630. A limiting protrusion is disposed on the periphery of the upper cover 620, and the upper cover 620 is rotatably connected to the upper part of the lower cover 630. An O-ring 610 is sleeved on the periphery of the lower cover 630, and a return spring 640 abuts against the lower part of the lower cover 630. Thus, in the unlocked state, after the external force pressing on the manual lever 600 is removed, the manual lever 600 can automatically reset under the drive of the return spring 640. When the upper cover 620 is rotated to switch the manual lever 600 between the locked and unlocked states, the lower cover 630 will not rotate with the upper cover 620. This ensures that the return spring 640 and O-ring 610 installed below the lower cover 630 are not affected by the rotation of the upper cover 620, which is beneficial to the stable operation of the manual lever 600.

[0077] The working principle of a pilot-operated solenoid valve 1000 in this embodiment is as follows: When the pilot-operated solenoid valve 1000 is operating normally, both manual levers 600 are in the unlocked state. By controlling the circuit to energize the coil 710 of the first pilot valve 200 and de-energize the coil 710 of the second pilot valve 300, the first outlet airflow path 430 is connected to the inlet airflow path 410, and the second outlet airflow path 440 is connected to the exhaust airflow path 420, thereby driving the valve stem 120 to move to the right, causing the left working port 142 to operate. By controlling the circuit to de-energize the coil 710 of the first pilot valve 200 and energize the coil 710 of the second pilot valve 300, the second outlet airflow path 440 is connected to the inlet airflow path 410, and the second outlet airflow path 440 is connected to the exhaust airflow path 420, thereby driving the valve stem 120 to move to the left, causing the right working port 144 to operate.

[0078] When both coils 710 are de-energized and both manual levers 600 are unlocked: In the first pilot valve 200, pressing down the manual lever 600 connects the intake air passage 410 to the first outlet air passage 430. In the second pilot valve 300, not pressing down the manual lever 600 connects the second outlet air passage 440 to the exhaust air passage 420. At this time, the valve stem 120 moves to the right, causing the left working port 142 to operate, and releasing the manual lever 600 in the first pilot valve 200 will not cause the valve stem 120 to move to the left. Similarly, pressing down only the manual lever 600 in the second pilot valve 300 causes the valve stem 120 to move to the left, causing the right working port 144 to operate, and releasing the manual lever 600 in the second pilot valve 300 will not cause the valve stem 120 to move.

[0079] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A pilot-operated solenoid valve, comprising a main valve (100) and a pilot valve assembly connected to the main valve (100), the pilot valve assembly comprising a first pilot valve (200) and a second pilot valve (300), the first pilot valve (200) and the second pilot valve (300) forming a control air passage (400) connecting cavities at both ends of the valve stem (120) of the main valve (100), the first pilot valve (200) and the second pilot valve (300) controlling the control air passage (400) to form a pressure difference at both ends of the valve stem (120) of the main valve (100) to drive the valve core to move; Its features are, The second pilot valve (300) is detachably connected to the side of the first pilot valve (200) away from the main valve (100); the first pilot valve (200) has a first mounting cavity (220) for mounting a manual lever (600), and the second pilot valve (300) has a second mounting cavity (320) for mounting a manual lever (600); the side wall of the first mounting cavity (220) is provided with a first slot (240), and the side wall of the second mounting cavity (320) is provided with a second slot (340); the first slot (240) and the second slot (340) are arranged facing each other and communicating with each other; both the first slot (240) and the second slot (340) are provided with locking plates (900) for limiting the manual lever (600), and the opposite ends of the two locking plates (900) abut against each other; The locking plate (900) has a limiting notch (910) on the side facing the manual lever (600), and the manual lever (600) has a limiting protrusion on its periphery that can abut against the lower side of the locking plate (900). At least part of the manual lever (600) is exposed to the outside through the limiting notch (910). The limiting protrusion includes a first limiting part (621) and a second limiting part (622). The first limiting part (621) and the second limiting part (622) are circumferentially offset along the manual lever (600). The side of the first limiting part (621) facing the locking plate (900) is located above the second limiting part (622). The manual lever (600) has: In the unlocked state, the second limiting part (622) is offset from the limiting notch (910) and is directly opposite the lower side of the locking plate (900), while the first limiting part (621) is directly opposite the limiting notch (910) and offset from the lower side of the locking plate (900). In the locked state, the first limiting part (621) rotates to be offset from the limiting notch (910) and is directly opposite the lower side of the locking plate (900); A continuous and inclined guide slope (623) extends between the opposing edges of the upper surfaces of the first limiting part (621) and the upper surfaces of the second limiting part (622).

2. The pilot-operated solenoid valve as described in claim 1, characterized in that, Two first limiting parts (621) are symmetrically arranged around the manual lever (600), and two second limiting parts (622) are symmetrically arranged around the manual lever (600). The two first limiting parts (621) are connected continuously between the two second limiting parts (622).

3. The pilot-operated solenoid valve as described in claim 1, characterized in that, The manual lever (600) is provided with a release part (624) above the limiting protrusion. The release part (624) is located above the locking plate (900) and exposed to the outside. The release part (624) extends outside the limiting notch (910) and faces the upper side of the locking plate (900).

4. A pilot-operated solenoid valve as described in claim 1, characterized in that, The manual lever (600) includes an upper cover (620) and a lower cover (630). The limiting protrusion is disposed on the periphery of the upper cover (620). The upper cover (620) is rotatably connected above the lower cover (630). The lower cover (630) abuts against a return spring (640) below.

5. A pilot-operated solenoid valve as described in claim 1, characterized in that, The pilot-operated solenoid valve (1000) also includes a connecting screw (500), which passes through the first pilot valve (200) and the second pilot valve (300) and is threaded to the main valve (100); The first pilot valve (200) has a positioning recess (210) on the side facing the second pilot valve (300), and the second pilot valve (300) has a positioning protrusion (310) on the side facing the first pilot valve (200) that matches the positioning recess (210).

6. A pilot-operated solenoid valve as described in claim 1, characterized in that, The control air path (400) includes an inlet air path (410), an exhaust air path (420), a first outlet air path (430), and a second outlet air path (440). The inlet air path (410) is connected to a pressure source, the exhaust air path (420) is connected to the outside, the first outlet air path (430) is connected to the cavity outside the first end of the valve stem (120) of the main valve (100), and the second outlet air path (440) is connected to the cavity outside the second end of the valve stem (120) of the main valve (100). Both the first pilot valve (200) and the second pilot valve (300) have a solenoid valve core assembly (700). The solenoid valve core assembly (700) of the first pilot valve (200) can control the first outlet airflow path (430) to connect to the inlet airflow path (410) or to connect to the exhaust airflow path (420). The solenoid valve core assembly (700) of the second pilot valve (300) can control the second outlet airflow path (440) to connect to the inlet airflow path (410) or to connect to the exhaust airflow path (420).

7. A pilot-operated solenoid valve as described in claim 6, characterized in that, The first pilot valve (200) also has a first working chamber (230), which is connected to the first mounting chamber (220) through a connecting chamber (450); the first mounting chamber (220) has a first exhaust port (221) connected to the exhaust flow path (420) on its lower side, and the first outlet flow path (430) is connected to the first mounting chamber (220); the first working chamber (230) has a first inlet port (231) connected to the inlet flow path (410) on its upper side; The moving iron core (740) of the solenoid valve core assembly (700) of the first pilot valve (200) is connected to an iron core sealing head (760). The manual lever (600) is connected to a bracket (800). A bracket (800) sealing head is fixed on the bracket (800). The end of the bracket (800) away from the manual lever (600) passes through the connecting cavity (450) and is connected to the moving iron core (740). When the moving iron core (740) moves, it can drive the iron core sealing head (760) to move to open or close the first air inlet (231) and drive the bracket (800) sealing head to move to close or open the first exhaust port (221).

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