Pilot valve for pulse valve

Abstract

The utility model discloses a pilot valve for a pulse valve, which relates to the field of pulse valves and comprises a pilot valve body, a fixing support, a pilot assembly and a junction box component, the pilot valve body is provided with an air inlet cavity and an air outlet cavity, a valve seat is arranged between the air inlet cavity and the air outlet cavity, and the valve seat is provided with a valve hole communicated with the air inlet cavity and the air outlet cavity; the fixed bracket is fixedly connected between the pilot valve body and the pilot assembly; the pilot assembly comprises a coil assembly, a static iron core and a movable iron core, the static iron core is fixedly arranged in the coil assembly in a penetrating mode, the movable iron core is arranged in the coil assembly in a sliding and penetrating mode, the movable iron core is right opposite to the static iron core, and an elastic piece is connected between the movable iron core and the static iron core in an abutting mode; the end, away from the static iron core, of the movable iron core is connected with a valve element part, and the valve element part can penetrate into the pilot valve body and seal the valve hole. The device has the advantages of being small in occupied space, convenient to install by a user and capable of reducing waste.

Description

Technical Field

[0001] This utility model relates to the field of pulse valves, and in particular to a pilot valve for pulse valves. Background Technology

[0002] Pulse valves are mainly used in bag filters. They use changes in gas pressure to spray compressed gas from the air tank (air distribution box) into the air chamber of the bag filter, causing solid dust adhering to the filter material to detach. They are a key component of bag filters.

[0003] In related technologies, pneumatic pulse valves are controlled via a remote pilot control box. Most current remote pilot control boxes control multiple pneumatic pulse valves simultaneously, such as... Figure 1 The pilot control box 2000 shown can control six pneumatic pulse valves. While this integrated pilot control method for multiple pneumatic pulse valves is convenient for controlling multiple valves, it makes diagnosing leaks difficult. Furthermore, in some cases, when only one or fewer pneumatic pulse valves need to be controlled by the pilot control box 2000, using the same box will prevent it from functioning fully, resulting in some waste. Additionally, the pilot control box 2000 occupies a large space, making installation inconvenient. Summary of the Invention

[0004] To address the shortcomings of existing pilot control boxes for pulse valves, this invention provides a pilot valve for pulse valves that requires little installation space and can individually control pneumatic pulse valves.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] This utility model provides a pilot valve for a pulse valve. The pilot valve includes a pilot valve body, a fixed bracket, a pilot assembly, and a junction box assembly. The pilot valve body has an inlet chamber and an outlet chamber, and a valve seat is provided between the inlet chamber and the outlet chamber. The valve seat has a valve hole communicating with the inlet chamber and the outlet chamber. The fixed bracket is fixedly connected between the pilot valve body and the pilot assembly. The pilot assembly includes a coil assembly, a stationary iron core, and a moving iron core. The stationary iron core is fixedly inserted into the coil assembly, and the moving iron core is slidably inserted into the coil assembly. The moving iron core and the stationary iron core face each other, and an elastic element abuts against each other. A valve core is connected to the end of the moving iron core away from the stationary iron core. The valve core can penetrate into the pilot valve body and close the valve hole.

[0007] Furthermore, the pilot assembly also includes a connecting sleeve, which passes through the coil assembly and is sleeved on the stationary iron core and the moving iron core, with the stationary iron core fixed to the connecting sleeve; the fixed bracket has a connecting hole, and one end of the connecting sleeve near the pilot valve body passes through the connecting hole and is radially outward to form a limiting flange, which abuts against the side of the fixed bracket facing the pilot valve body.

[0008] Furthermore, the end of the stationary iron core away from the moving iron core extends out of the coil assembly and has a limiting groove. A retaining spring is fitted over the limiting groove and abuts against the outside of the coil assembly.

[0009] Furthermore, an adjusting pad is abutted between the coil assembly and the fixed bracket, the adjusting pad being annular and sleeved on the connecting sleeve.

[0010] Furthermore, the moving iron core has an axially formed mounting hole, which penetrates one end of the stationary iron core facing the moving iron core; the elastic element includes a compression spring, which is installed in the mounting hole.

[0011] Furthermore, the moving iron core has a connecting hole in the radial direction, the connecting hole connecting the mounting hole and the inner cavity of the connecting sleeve, the connecting sleeve passing through the pilot valve body and communicating with the air outlet chamber.

[0012] Furthermore, a first sealing ring groove is provided on the side of the pilot valve body facing the fixed bracket. The first sealing ring groove is concentrically arranged with the valve hole. A first sealing ring is embedded in the first sealing ring groove. The limiting flange is pressed on the side of the first sealing ring facing the fixed bracket.

[0013] Furthermore, the coil assembly includes a housing, a coil body, a coil bracket, and terminals. The coil bracket is fixed inside the housing and has a pilot hole for the connecting sleeve to pass through. The coil body is sleeved on the coil bracket, and the terminals are electrically connected to the coil body. The terminals extend out of the housing and are electrically connected to the junction box assembly.

[0014] Furthermore, the junction box assembly includes a box body, which is fixed to the outer shell. The box body is provided with a wiring port, and the wiring terminal is plugged into the wiring port.

[0015] Furthermore, the fixing bracket includes a horizontal plate and a vertical plate. The horizontal plate is fixedly connected to the pilot valve body, and the vertical plate is fixedly connected to the end of the horizontal plate. The vertical plate extends in a direction away from the coil assembly, and a fixing hole for connecting the pulse valve is provided on the vertical plate.

[0016] In summary, this utility model has the following beneficial effects:

[0017] 1. In this utility model, the pilot valve of the pulse valve is fixed to the pulse valve by a fixed bracket. The air inlet chamber of the pilot valve body is connected to the pulse valve, and the air outlet chamber of the pilot valve is connected to the atmosphere. The pilot assembly is connected to the pilot valve body by a fixed bracket. When the coil assembly is energized, the stationary iron core generates magnetic force to attract the moving iron core, causing the moving iron core to move away from the valve hole. At this time, the air inlet chamber and the air outlet chamber are connected, thereby regulating the air pressure in the pulse valve to open the pulse valve. When the coil assembly is de-energized, the moving iron core moves under the action of the elastic element, causing the valve core to close the valve hole, isolating the air inlet chamber and the air outlet chamber, and thus isolating the pulse valve from the outside world. This achieves control of a single pulse valve, making it easy to identify the leak point when leakage occurs. At the same time, the number of pilot valves for each pulse valve is set, eliminating the need for an excessively large pilot control box, which is convenient for user installation and reduces waste.

[0018] 2. The connecting sleeve is fixedly sleeved outside the stationary iron core, and the end of the connecting sleeve away from the stationary iron core passes through the fixed bracket and is axially limited at the connecting hole by the limiting flange, thereby realizing the connection of the pilot assembly, the fixed bracket and the pilot valve body, which has the advantages of quick and convenient connection.

[0019] 3. The end of the stationary iron core furthest from the moving iron core passes through the coil assembly and is provided with a limiting groove. A retaining ring is provided on the outside of the coil assembly and sleeved outside the limiting groove to achieve axial limiting of the stationary iron core, restricting its movement in the direction closer to the pilot valve body. At the same time, since the limiting flange limits the fixed bracket on the side facing the pilot valve body (i.e., the side furthest from the stationary iron core), the stationary iron core, coil assembly, connecting sleeve, and fixed bracket are connected as one unit. Therefore, when assembling the pilot valve for this pulse valve, the connecting sleeve and stationary iron core can be passed through the fixed bracket and coil assembly first, then the retaining ring can be used to lock the stationary iron core, the moving iron core and elastic element can be installed into the connecting sleeve, and finally the fixed bracket can be fixedly connected to the pilot valve body. This makes the assembly of the pilot valve for this pulse valve simple and convenient, saving labor costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the pilot control box in related technologies.

[0021] Figure 2 This is a three-dimensional structural schematic diagram of a pilot valve for a pulse valve according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the main structure of a pilot valve for a pulse valve according to an embodiment of the present invention.

[0023] Figure 4 This is a top view schematic diagram of the pilot valve for a pulse valve according to an embodiment of the present invention.

[0024] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure at point AA.

[0025] Figure 6 This is a bottom view of the pilot valve for a pulse valve according to an embodiment of the present invention.

[0026] Figure 7 This is a cross-sectional structural schematic diagram of the pilot valve body, fixed bracket and pilot assembly according to an embodiment of the present invention.

[0027] Figure 8 yes Figure 7 Enlarged structural diagram at point B.

[0028] In the picture:

[0029] 1000, Pilot valve for pulse valve; 100, Pilot valve body; 110, Inlet chamber; 120, Outlet chamber; 130, Valve seat; 131, Valve hole; 140, Operating port; 150, Flange; 160, Connecting bolt; 170, First sealing ring groove; 180, First sealing ring; 200, Fixing bracket; 210, Horizontal plate; 211, Connecting hole; 212, Second sealing ring groove; 213, Second sealing ring; 220, Vertical plate; 221, Fixing hole; 300, Pilot assembly; 31 0. Coil assembly; 311. Housing; 312. Coil body; 313. Coil bracket; 314. Terminal block; 320. Stationary iron core; 321. Limiting groove; 330. Moving iron core; 331. Mounting hole; 332. Connecting hole; 340. Elastic element; 350. Valve core; 360. Connecting sleeve; 361. Limiting flange; 370. Snap ring; 400. Junction box assembly; 410. Box body; 420. Wiring port; 500. Adjusting pad; 2000. Pilot control box. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] This embodiment discloses a pilot valve 1000 for a pulse valve, referring to... Figure 2 and Figure 3 The pilot valve 1000 for the pulse valve includes a pilot valve body 100, a mounting bracket 200, a pilot assembly 300, and a junction box assembly 400. The mounting bracket 200 is fixedly connected between the pilot valve body 100 and the pilot assembly 300, and is used to mount the pilot valve body 100 onto the pulse valve. The pilot assembly 300 is disposed on the pilot valve body 100 and is used to control the connection and disconnection of the internal air passage of the pilot valve body 100. The junction box assembly 400 is disposed on the pilot assembly 300 and is used to supply power to the pilot assembly 300.

[0032] In this embodiment, the pilot valve body 100 has an inlet chamber 110 and an outlet chamber 120, with the outlet chamber 120 of the pilot valve body 100 being perpendicular to the inlet chamber 110. The inlet chamber 110 of the pilot valve body 100 is connected to the pulse valve, and the outlet chamber 120 of the pilot valve is connected to the atmosphere.

[0033] Reference Figure 4 and Figure 5 A valve seat 130 is provided between the intake chamber 110 and the outlet chamber 120, separating the two chambers. The valve seat 130 has a valve hole 131 communicating with the intake chamber 110 and the outlet chamber 120. The pilot assembly 300 can control the opening or closing of the valve hole 131, thereby controlling the connection or disconnection between the intake chamber 110 and the outlet chamber 120. Specifically, the pilot valve body 100 has an operating port 140 on the side facing the pilot assembly 300. The operating port 140 communicates with the valve hole 131, and the pilot assembly 300 can pass through the operating port 140 to act on the valve hole 131.

[0034] Reference Figure 5 and Figure 6 A flange 150 is formed on the side of the pilot valve body 100 near the fixed bracket 200, and the flange 150 is arranged parallel to the fixed bracket 200. In this embodiment, the pilot valve body 100 is fixedly connected to the fixed bracket 200 by a connecting bolt 160 passing through the flange 150, so as to facilitate the assembly of the pilot valve body 100 and the fixed bracket 200. In other embodiments, the pilot valve body 100 may also be connected to the fixed bracket 200 by other suitable means.

[0035] Combination Figure 2 The fixed bracket 200 includes a horizontal plate 210 and a vertical plate 220. The horizontal plate 210 is fixedly connected to the pilot valve body 100 by connecting bolts 160, and the vertical plate 220 is fixedly connected to the end of the horizontal plate 210. The vertical plate 220 extends away from the coil assembly 310, and the vertical plate 220 is provided with a fixing hole 221 for connecting the pulse valve.

[0036] Reference Figure 5 and Figure 7The pilot assembly 300 includes a coil assembly 310, a stationary iron core 320, and a moving iron core 330. The coil assembly 310 is fixedly mounted relative to the fixed bracket 200 and is electrically connected to the junction box assembly 400. The stationary iron core 320 is fixedly inserted into the coil assembly 310, and the moving iron core 330 is slidably inserted into the coil assembly 310, with the moving iron core 330 positioned at the end of the stationary iron core 320 facing the pilot valve body 100. The moving iron core 330 is directly opposite the stationary iron core 320, and an elastic member 340 abuts against the moving iron core 330 and the stationary iron core 320. A valve core 350 is connected to the end of the moving iron core 330 away from the stationary iron core 320, and the valve core 350 can be inserted into the operating port 140 and close the valve hole 131.

[0037] In this embodiment, the valve core 350 may be made of rubber to better seal the valve orifice 131. In other embodiments, the valve core 350 may also be made of other flexible sealing materials.

[0038] When the coil assembly 310 is energized, the stationary iron core 320 generates a magnetic force that attracts the moving iron core 330, causing the valve core 350 to move away from the valve hole 131. At this time, the inlet chamber 110 and the outlet chamber 120 are connected, thereby regulating the air pressure inside the pulse valve to open it. When the coil assembly 310 is de-energized, the moving iron core 330 moves under the action of the elastic element 340, causing the valve core 350 to close the valve hole 131, isolating the inlet chamber 110 and the outlet chamber 120, and thus isolating the pulse valve from the outside world. At this time, the pulse valve is closed. This achieves control of a single pulse valve, making it easy to identify the leak point when leakage occurs. Furthermore, the number of pilot valves 1000 is set according to the number of pulse valves, eliminating the need for a large space-consuming pilot control box like traditional ones, simplifying installation and reducing waste.

[0039] Reference Figure 5 , Figure 7 and Figure 8 The pilot assembly 300 also includes a connecting sleeve 360, which passes through the coil assembly 310 and is sleeved on the outside of the stationary iron core 320 and the moving iron core 330. The stationary iron core 320 is fixed to the connecting sleeve 360.

[0040] A connecting hole 211 is provided on the horizontal plate 210 of the fixed bracket 200. The connecting hole 211 is aligned with and communicates with the operating port 140. The end of the connecting sleeve 360 ​​near the pilot valve body 100 passes through the connecting hole 211 and is radially outward to form a limiting flange 361. The limiting flange 361 abuts against the side of the fixed bracket 200 facing the pilot valve body 100. The connecting sleeve 360 ​​is fixedly sleeved on the outside of the stationary iron core 320, and the end of the connecting sleeve 360 ​​away from the stationary iron core 320 passes through the fixed bracket 200 and is axially limited at the connecting hole 211 by the limiting flange 361. This realizes the connection of the pilot assembly 300, the fixed bracket 200 and the pilot valve body 100, which has the advantages of quick and convenient connection.

[0041] One end of the stationary iron core 320, away from the moving iron core 330, extends out of the coil assembly 310 and has a limiting groove 321. A retaining ring 370 is sleeved on the limiting groove 321, and the retaining ring 370 abuts against the outside of the coil assembly 310. Thus, by setting the retaining ring 370 on the outside of the coil assembly 310 and sleeved on the limiting groove 321, the axial limiting of the stationary iron core 320 is achieved, restricting the movement of the stationary iron core 320 in the direction close to the pilot valve body 100. At the same time, since the limiting flange 361 limits the fixed bracket 200 on the side facing the pilot valve body 100 (i.e., the side away from the stationary iron core 320), the stationary iron core 320, the coil assembly 310, the connecting sleeve 360, and the fixed bracket 200 are connected as a whole. Therefore, when assembling the pilot valve 1000 for the pulse valve, the connecting sleeve 360 ​​and the stationary iron core 320 can be passed through the fixed bracket 200 and the coil assembly 310 first, and then the stationary iron core 320 can be locked with the snap ring 370. The moving iron core 330 and the elastic element 340 can be installed into the connecting sleeve 360, and finally the fixed bracket 200 can be fixedly connected to the pilot valve body 100. This makes the assembly of the pilot valve 1000 for the pulse valve simple and convenient, and saves labor costs.

[0042] A first sealing ring groove 170 is provided on the side of the pilot valve body 100 facing the fixed bracket 200. The first sealing ring groove 170 is concentrically arranged with the valve hole 131 and surrounds the operating port 140. A first sealing ring 180 is embedded in the first sealing ring groove 170. When the connecting sleeve 360 ​​is aligned and connected with the operating port 140, the limiting flange 361 is pressed against the side of the first sealing ring 180 facing the fixed bracket 200, thereby achieving a seal between the connecting sleeve 360 ​​and the operating port 140.

[0043] Furthermore, a second sealing ring groove 212 is provided on the side of the horizontal plate 210 of the fixed bracket 200 facing the pilot valve body 100, and the second sealing ring groove 212 is concentrically arranged with the connecting hole 211. A second sealing ring 213 is embedded in the second sealing groove, and the second sealing ring 213 abuts against the side of the limiting flange 361 facing the horizontal plate 210, thereby further enhancing the airtightness between the connecting sleeve 360 ​​and the pilot valve body 100.

[0044] Reference Figure 7 An adjusting shim 500 abuts against the coil assembly 310 and the fixed bracket 200. The adjusting shim 500 is annular and sleeved on the connecting sleeve 360. The adjusting shim 500 separates the coil assembly 310 from the fixed bracket 200, reducing the vibration transmitted from the pilot assembly 300 to the pilot valve body 100, which is beneficial to the normal operation of the pilot valve 1000 of the pulse valve.

[0045] Reference Figure 5 and Figure 7 The coil assembly 310 includes a housing 311, a coil body 312, a coil support 313, and a terminal block 314. The housing 311 is fixed between a retaining ring 370 and an adjusting pad 500. The coil support 313 is fixed inside the housing 311 and has a through hole for the connecting sleeve 360 ​​to pass through. The coil body 312 is fitted onto the coil support 313, and the terminal block 314 is electrically connected to the coil body 312. The terminal block 314 extends out of the housing 311 and is electrically connected to the junction box assembly 400. The junction box assembly 400 supplies power to the coil assembly 310 through the terminal block 314, causing the coil assembly 310 to generate a magnetic field to drive the moving iron core 330 to move.

[0046] In this embodiment, the junction box assembly 400 includes a housing 410, which is fixed to the outer casing 311. The housing 410 is provided with a wiring port 420, which is electrically connected to an external power source and is compatible with a terminal block 314. When the housing 410 is fixedly installed on the outer casing 311, the terminal block 314 is inserted into the wiring port 420 to achieve electrical connection between the junction box assembly 400 and the coil assembly 310.

[0047] Reference Figure 7 In this embodiment, the moving iron core 330 has an axially oriented mounting hole 331, which penetrates the end of the stationary iron core 320 facing the moving iron core 330. The elastic element 340 includes a compression spring, which is installed in the mounting hole 331. When the moving iron core 330 moves toward the stationary iron core 320 under the action of magnetic force, the elastic element 340 is compressed and stores elastic force. After the magnetic force is removed, the moving iron core 330 moves away from the stationary iron core 320 under the elastic force of the elastic element 340, and drives the valve core 350 to stably close the valve orifice 131.

[0048] In this embodiment, the outer periphery of the end of the moving iron core 330 near the stationary iron core 320 is adapted to the inner cavity of the connecting sleeve 360, that is, the diameter of the end of the moving iron core 330 near the stationary iron core 320 is the same as or close to the inner diameter of the connecting sleeve 360, so that the moving iron core 330 slides stably in the connecting sleeve 360.

[0049] The diameter of the end of the moving iron core 330 furthest from the stationary iron core 320 is smaller than the inner diameter of the connecting sleeve 360, and a connecting hole 332 is radially formed at the end of the moving iron core 330 furthest from the stationary iron core 320, which connects to the mounting hole 331 and the inner cavity of the connecting sleeve 360. Since the connecting sleeve 360 ​​passes through the pilot valve body 100 and connects to the air outlet chamber 120, the cavity between the stationary iron core 320 and the moving iron core 330 remains connected to the air outlet chamber 120 to balance the pressure difference on both sides of the moving iron core 330 and ensure that the moving iron core 330 can move smoothly.

[0050] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A pilot valve for a pulse valve, characterized in that, The pilot valve (1000) for the pulse valve includes a pilot valve body (100), a fixed bracket (200), a pilot assembly (300), and a junction box assembly (400). The pilot valve body (100) has an inlet chamber (110) and an outlet chamber (120). A valve seat (130) is provided between the inlet chamber (110) and the outlet chamber (120). The valve seat (130) has a valve hole (131) communicating with the inlet chamber (110) and the outlet chamber (120). The fixed bracket (200) is fixedly connected between the pilot valve body (100) and the pilot assembly (300). The pilot assembly (300) includes... The device includes a coil assembly (310), a stationary iron core (320), and a moving iron core (330). The stationary iron core (320) is fixedly inserted into the coil assembly (310), and the moving iron core (330) is slidably inserted into the coil assembly (310). The moving iron core (330) is directly opposite the stationary iron core (320), and an elastic element (340) abuts against the stationary iron core (320). A valve core (350) is connected to one end of the moving iron core (330) away from the stationary iron core (320). The valve core (350) can be inserted into the pilot valve body (100) and close the valve hole (131).

2. The pilot valve for a pulse valve as described in claim 1, characterized in that, The pilot assembly (300) further includes a connecting sleeve (360), which passes through the coil assembly (310) and is sleeved on the stationary iron core (320) and the moving iron core (330). The stationary iron core (320) is fixed to the connecting sleeve (360). The fixed bracket (200) has a connecting hole (211). One end of the connecting sleeve (360) near the pilot valve body (100) passes through the connecting hole (211) and is radially outward to form a limiting flange (361). The limiting flange (361) abuts against the side of the fixed bracket (200) facing the pilot valve body (100).

3. The pilot valve for a pulse valve as described in claim 2, characterized in that, The stationary iron core (320) extends out of the coil assembly (310) at the end away from the moving iron core (330) and has a limiting groove (321) formed thereon. A retaining ring (370) is sleeved on the limiting groove (321) and abuts against the outside of the coil assembly (310).

4. The pilot valve for a pulse valve as described in claim 3, characterized in that, An adjusting pad (500) abuts against the coil assembly (310) and the fixed bracket (200). The adjusting pad (500) is annular and sleeved on the connecting sleeve (360).

5. A pilot valve for a pulse valve as described in claim 2, characterized in that, The moving iron core (330) has an axially formed mounting hole (331), which penetrates the stationary iron core (320) at one end facing the moving iron core (330); the elastic element (340) includes a compression spring, which is installed in the mounting hole (331).

6. A pilot valve for a pulse valve as described in claim 5, characterized in that, The moving iron core (330) has a connecting hole (332) in the radial direction. The connecting hole (332) connects the mounting hole (331) and the inner cavity of the connecting sleeve (360). The connecting sleeve (360) passes through the pilot valve body (100) and connects with the air outlet chamber (120).

7. A pilot valve for a pulse valve as described in claim 2, characterized in that, The pilot valve body (100) has a first sealing ring groove (170) on the side facing the fixed bracket (200). The first sealing ring groove (170) is concentrically arranged with the valve hole (131). A first sealing ring (180) is embedded in the first sealing ring groove (170). The limiting flange (361) is pressed on the side of the first sealing ring (180) facing the fixed bracket (200).

8. A pilot valve for a pulse valve as described in claim 2, characterized in that, The coil assembly (310) includes a housing (311), a coil body (312), a coil bracket (313), and a terminal block (314). The coil bracket (313) is fixed inside the housing (311) and has a pilot hole for the connecting sleeve (360) to pass through. The coil body (312) is fitted onto the coil bracket (313), and the terminal block (314) is electrically connected to the coil body (312). The terminal block (314) extends out of the housing (311) and is electrically connected to the junction box assembly (400).

9. A pilot valve for a pulse valve as described in claim 8, characterized in that, The junction box assembly (400) includes a box body (410), which is fixed to the outer shell (311). The box body (410) is provided with a wiring port (420), and the wiring terminal (314) is plugged into the wiring port (420).

10. A pilot valve for a pulse valve as described in claim 1, characterized in that, The fixed bracket (200) includes a horizontal plate (210) and a vertical plate (220). The horizontal plate (210) is fixedly connected to the pilot valve body (100), and the vertical plate (220) is fixedly connected to the end of the horizontal plate (210). The vertical plate (220) extends in a direction away from the coil assembly (310), and the vertical plate (220) is provided with a fixing hole (221) for connecting the pulse valve.

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