A chemical protection, gas filtering and ventilation switching valve

Abstract

The invention discloses a chemical protection and gas filtering ventilation switching valve, in which a valve plate (17) is fixedly connected to a valve plate shaft (18), the left and right sides of the valve plate shaft (18) respectively pass through a housing A (4) and a housing B (6), and the left side is movably connected to a clutch A (22); the clutch B (23) is fixed on a motor (26) shaft, and the two clutches are engaged; a PCB board (2), a shift fork (21), the motor (26), and an electromagnet (push type) (25) are fixed on the left side of the housing A (4); the right side of the valve plate shaft (18) is fixedly connected to a valve plate handle (15); the middle hole of a limit pin (9) is movably connected to a fixed shaft (29); the upper end of an electromagnet connecting rod (8) is movably connected to the upper end of a limit pin (9); and the lower end of the electromagnet connecting rod (8) is movably connected to an electromagnet (pull type) (10) push rod; the switching valve manufactured by the invention has the advantages of small size, fast switching, communication linkage, stable performance, etc.

Description

Technical Field

[0001] The invention belongs to the field of valves, and in particular relates to a chemical protection, gas filtering and ventilation switching valve. Background Art

[0002] The chemical defense gas filter ventilation switching valve is a special device used to realize the switching function between gas filter ventilation and clean ventilation in the chemical defense three-defense system; the gas filter ventilation switching valve is installed in the gas filter ventilation system and is usually in the clean ventilation state. When an alarm signal is received, the gas filter ventilation switching valve needs to switch to the gas filter ventilation state; in order to ensure ventilation safety and protect from harm by pollutants, the gas filter ventilation switching valve has high requirements for switching time and air tightness. Usually the switching time is no more than 150 milliseconds, and the leakage is no more than 0.5‰ of the rated air volume. Currently, most gas filter ventilation switching valves are manual switching valves. When the operator receives the alarm information, they usually manually switch the switching valve from the clean ventilation mode to the gas filter ventilation mode; the switching time is usually long, and it is impossible to achieve rapid linkage, which affects the protection effect of the gas filter ventilation system. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and to design a chemical protection, gas filtering and ventilation switching valve.

[0004] A chemical and gas filtering ventilation switching valve mainly includes a PCB board, a shell A, a shell B, an electromagnet connecting rod, a limit pin, an electromagnet-pull type, a valve plate handle, a spring B, a valve plate, a valve plate shaft, a shift fork, a clutch A, a clutch B, an electromagnet-push type, a motor, a fixed shaft, and a spring fixing hole; the valve plate is fixedly connected to the valve plate shaft, and the left and right sides of the valve plate shaft pass through the shell A and the shell B respectively and are movably connected thereto; the left side of the valve plate shaft is movably connected to the clutch A and can move axially; the clutch B is fixed on the motor shaft and meshes with the clutch A; the PCB board is fixed to the left side of the shell A; the shift fork The motor is fixed on the left side of the housing A and placed on the clutch A; the motor is fixed on the left side of the housing A; the electromagnet-push type is fixed on the left side of the housing A and placed in the middle position of the shift fork; the right side of the valve plate shaft is fixedly connected to the valve plate handle; the spring column on the valve plate handle is fixedly connected to the lower end of the spring B; the upper end of the spring B is fixedly connected to the spring fixing hole at the upper right corner of the housing B; the middle hole of the limit pin is movably connected to the fixed shaft on the housing B; the upper end of the electromagnet connecting rod is movably connected to the upper end of the limit pin; the lower end of the electromagnet connecting rod is movably connected to the electromagnet-pull push rod;

[0005] Furthermore, it also includes a valve plate pin and a split pin; the valve plate and the valve plate shaft are fixedly connected through the valve plate pin; the right side of the valve plate shaft is fixedly connected to the valve plate handle through the split pin;

[0006] Furthermore, it also includes a motor mounting frame and a PCB board mounting frame; the motor and the electromagnet-push type are fixed to the motor mounting frame by M3 screws and are fixed to the left side of the housing A by M4 screws; the PCB board is installed on the PCB board mounting frame by M3 screws and is fixed to the left side of the housing A by M3 screws;

[0007] Furthermore, it also includes an upper limit switch and a lower limit switch; the upper limit switch is fixed to the right side of the housing B by an M2 screw and is located at the upper right end of the limit pin; the lower limit switch is fixed to the right side of the housing B by an M2 screw and is located at the lower right side of the valve handle;

[0008] Furthermore, it also includes a sealing ring, which is fixedly mounted on the groove of the valve plate;

[0009] Furthermore, it also includes a front cover and a rear cover; the rear cover is fixedly connected to the housing A by bolts; the front cover is fixedly connected to the housing B by bolts;

[0010] Furthermore, it also includes a shift fork limiting column, which is located on the shift fork on the opposite side of the electromagnet-push type push rod;

[0011] Furthermore, it also includes a spring A, one end of which is connected to the lower left end column of the limit pin; and the other end is connected to the fixing column on the cotter pin;

[0012] Furthermore, it also includes an aviation plug, which is fixedly installed on the hole on the side of the rear cover.

[0013] A chemical-proof gas-filtering and ventilation switching valve manufactured using the technical solution of the present invention overcomes the safety hazards of the original manual switching and realizes a miniaturized design to meet the needs of a gas-filtering and ventilation system; it can not only solve the problem of rapid switching, but also communicate and link with the gas-filtering and ventilation system, with stable and reliable performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an exploded diagram of the connection structure of a chemical protection, gas filtering and ventilation switching valve of the present invention;

[0015] Figure 2 It is a structural schematic diagram of a chemical protection, gas filtering and ventilation switching valve of the present invention when the rear cover is opened;

[0016] Figure 3 It is a schematic diagram of a chemical protection, gas filtering and ventilation switching valve of the present invention with the front cover opened and in a clean ventilation state;

[0017] Figure 4 It is a schematic diagram of a chemical defense gas filtering and ventilation switching valve of the present invention with the front cover opened and the gas filtering and ventilation status.

[0018] In the figure, 1, rear cover; 2, PCB board; 3, PCB board mounting bracket; 4, housing A; 5, sealing ring; 6, housing B; 7, upper limit switch; 8, electromagnet connecting rod; 9, limit pin; 10, electromagnet (pull type); 11, electromagnet fixing bracket; 12, front cover; 13, spring A; 14, cotter pin; 15, valve handle; 16, spring B; 17, valve; 18, valve shaft; 19, valve pin; 20, shift fork limit column; 21, shift fork; 22, clutch A; 23, clutch B; 24, motor mounting bracket; 25, electromagnet (push type); 26, motor; 27, aviation plug; 28, spring column; 29, fixed shaft; 30, lower limit switch; 31, spring fixing hole. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings. Figure 1 , Figure 2 As shown,

[0020] A chemical-proof, gas-filtering and ventilation switching valve comprises a PCB board 2, a PCB board mounting frame 3, a housing A4, a housing B6, an electromagnet connecting rod 8, a limit pin 9, an electromagnet-pull type 10, a spring A13, a cotter pin 14, a valve handle 15, a spring B16, a valve 17, a valve shaft 18, a valve pin 19, a shift fork 21, a clutch A22, a clutch B23, a motor mounting frame 24, an electromagnet-push type 25, a motor 26, a fixed shaft 29, and a spring fixing hole 31; the valve 17 and the valve shaft 18 are fixedly connected by the valve pin 19, and the left and right sides of the valve shaft 18 respectively pass through the circular holes on the housing A4 and the housing B6 and are movably connected thereto; the left side of the valve shaft 18 is movably connected to the clutch A22 through a flat key pin and can be axially moved Movement; the clutch B23 is fixed to the shaft of the motor 26 by M6 screws and meshes with the clutch A22; the motor 26 and the electromagnet-push type 25 are fixed to the motor mounting frame 24 by M3 screws and fixed to the left side of the housing A4 by M4 screws; the electromagnet-push type 25 is also placed in the middle position of the fork 21; the PCB board 2 is mounted on the PCB board mounting frame 3 by M3 screws and fixed to the left side of the housing A4 by M3 screws; the fork 21 is fixed to the left side of the housing A4 by M8 hexagon socket screws and placed on the clutch A22; the right side of the valve plate shaft (18) is fixedly connected to the valve plate handle 15 by a cotter pin 14; the spring column on the valve plate handle 15 28 is fixedly connected to the lower end of the spring B16; the upper end of the spring B16 is fixedly connected to the spring fixing hole 31 at the upper right corner of the shell B6; the middle hole of the limit pin 9 is movably connected to the fixed shaft 29 on the shell B6; the upper end of the electromagnet connecting rod 8 is movably connected to the upper end of the limit pin 9 through a cotter pin; the lower end of the electromagnet connecting rod 8 is movably connected to the electromagnet-pull type 10 push rod through a cotter pin; it also includes an upper limit switch 7, which is fixed to the right side of the shell B6 by an M2 screw and is located at the upper right end of the limit pin 9; it also includes a lower limit switch 30, which is fixed to the right side of the shell B6 by an M2 screw and is located at the lower right side of the valve handle 15; it also includes a seal A sealing ring 5, which is fixedly mounted on the groove of the valve plate 17; it also includes a front cover 12 and a rear cover 1; the rear cover 1 is fixedly connected to the shell A4 by bolts; the front cover 12 is fixedly connected to the shell B6 by bolts; it also includes a fork limit column 20, which is located on the fork 21 on the opposite side of the electromagnet-push type 25 push rod; it also includes a spring A13, one end of which is connected to the lower left end column of the limit pin 9; the other end is connected to the fixed column on the cotter pin 14; it also includes an aviation plug 27, which is fixedly mounted on the hole on the side of the rear cover 1; it has three plugs, one is a DC24V power cord; the other two are one-input and one-output KAN communication signal lines.

[0021] In actual operation, Figure 1 , Figure 2 , Figure 3 As shown; when the control system inputs the clean ventilation signal to the PCB board 2 through the KAN communication signal line, the controller on the PCB board 2 outputs a DC24V voltage to the motor 26, and the motor 26 drives the clutch B23 to rotate clockwise, driving the engaged clutch A22 to rotate clockwise; since the clutch A22 and the valve shaft 18 are fixed by the M5*5 GB1096C type flat key pin, the valve shaft 18 and the valve 17 and the valve handle 15 are fixedly connected; therefore, the valve 17 and the sealing ring 5 thereon, and the valve handle 15 together rotate axially clockwise along the axis of the valve shaft 18 Turn 52°; due to the downward pulling force of spring A13, the lower left end of the limit pin 9 is engaged with the recessed part of the valve handle 15, and the upper right end of the limit pin 9 touches the upper limit switch 7. The upper limit switch 7 sends a cleaning ventilation signal to the PCB board 13, and the controller on the PCB board 13 stops inputting DC24V voltage to the motor 26, and the motor 26 stops rotating; at this time, the controller inputs DC-24V voltage to the motor 26 for 100ms, so that the clutch B23 rotates counterclockwise by another 5° to prevent the clutch A22 and the clutch B23 from being too tightly engaged. At this time, the state is clean ventilation.

[0022] When the control system inputs the gas filtering and ventilation signal to the PCB board 2 through the KAN communication signal line, the controller on the PCB board 2 simultaneously outputs a DC24V voltage to the electromagnet (push type) 25 and the electromagnet (pull type) 10, and the electromagnet (pull type) 10 instantly pulls the electromagnet connecting rod 8 downward, driving the upper end of the limit pin 9 to also pull downward. Due to its lever design, the lower left end of the limit pin 9 is disengaged from the section that is engaged with the valve handle 15. Under the rebound force of the spring A13, the limit pin 9 quickly returns to its position; at the same time, the push rod of the electromagnet (push type) 25 located on the left side of the housing A4 quickly pushes the fork 21 to the right, pushing the clutch A22 and the clutch B23 to disengage; The valve handle 15 is pulled by the spring 16, and instantly rotates 52° counterclockwise along the axis of the valve shaft 18 together with the valve 17 and the sealing ring 5 thereon. The lower right side of the valve handle 15 triggers the lower limit switch 30, and the lower limit switch 30 sends a gas filtering and ventilation signal to the PCB board 2. The controller on the PCB board 2 simultaneously stops outputting DC24V voltage to the electromagnet (push type) 25 and the electromagnet (pull type) 10, and the two moving axes quickly return to their positions; the fork 21, due to its own elasticity and the obstruction of the fork limit column 20, quickly drives the clutch A22 to return to its original state, until the clutch A22 and the clutch B23 continue to engage; at this time, the state is gas filtering and ventilation; Figure 1 , Figure 2 , Figure 4 As shown; this cycle process is completed; the next process begins.

[0023] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A chemical protection and gas filtering ventilation switching valve, characterized in that: The invention mainly comprises a PCB board (2), a housing A (4), a housing B (6), an electromagnet connecting rod (8), a limit pin (9), an electromagnet-pull type (10), a valve plate handle (15), a spring B (16), a valve plate (17), a valve plate shaft (18), a shift fork (21), a clutch A (22), a clutch B (23), an electromagnet-push type (25), a motor (26), a fixed shaft (29), and a spring fixing hole (31); the valve plate (17) is fixedly connected to the valve plate shaft (18), and the left and right sides of the valve plate shaft (18) respectively pass through the housing A (4) and the housing B (6) and are movably connected thereto; the left side of the valve plate shaft (18) is movably connected to the clutch A (22) and can move axially; the clutch B (23) is fixed on the shaft of the motor (26) and meshes with the clutch A (22); the PCB board (2) is fixed on the left side of the housing A (4); The shift fork (21) is fixed on the left side of the housing A (4) and is placed on the clutch A (22); the motor (26) is fixed on the left side of the housing A (4); the electromagnet-push type (25) is fixed on the left side of the housing A (4) and is placed in the middle of the shift fork (21); the right side of the valve plate shaft (18) is fixedly connected to the valve plate handle (15); the spring column (28) on the valve plate handle (15) is fixedly connected to the lower end of the spring B (16); the upper end of the spring B (16) is fixedly connected to the spring fixing hole (31) at the upper right corner of the housing B (6); the middle hole of the limit pin (9) is movably connected to the fixed shaft (29) on the housing B (6); the upper end of the electromagnet connecting rod (8) is movably connected to the upper end of the limit pin (9); the lower end of the electromagnet connecting rod (8) is movably connected to the electromagnet-pull type (10) push rod; It also includes a valve plate pin (19) and a split pin (14); the valve plate (17) and the valve plate shaft (18) are fixedly connected via the valve plate pin (19); the right side of the valve plate shaft (18) and the valve plate handle (15) are fixedly connected via the split pin (14); It also includes an upper limit switch (7) and a lower limit switch (30); the upper limit switch (7) is fixed to the right side of the housing B (6) by means of an M2 screw and is located at the upper right end of the limit pin (9); the lower limit switch (30) is fixed to the right side of the housing B (6) by means of an M2 screw and is located at the lower right side of the valve plate handle (15); It also includes a spring A (13), one end of which is connected to the lower left column of the limit pin (9); and the other end is connected to the fixing column on the cotter pin (14); The lower left end of the limit pin (9) can be engaged with the concave portion of the valve plate handle (15), or can be disengaged from the portion engaged with the valve plate handle (15).

2. The chemical protection and gas filtering ventilation switching valve according to claim 1 is characterized in that: It also includes a motor mounting frame (24) and a PCB mounting frame (3); the motor (26) and the electromagnet-push type (25) are fixed to the motor mounting frame (24) by M3 screws, and the motor mounting frame (24) is fixed to the left side of the housing A (4) by M4 screws; the PCB board (2) is mounted on the PCB mounting frame (3) by M3 screws, and the PCB mounting frame (3) is fixed to the left side of the housing A (4) by M3 screws.

3. The chemical protection and gas filtering ventilation switching valve according to claim 1 is characterized in that: It also comprises a sealing ring (5), wherein the sealing ring (5) is fixedly mounted on the groove of the valve plate (17).

4. The chemical protection and gas filtering ventilation switching valve according to claim 1 is characterized in that: It also comprises a front cover (12) and a rear cover (1); the rear cover (1) is fixedly connected to the housing A (4) by means of bolts; and the front cover (12) is fixedly connected to the housing B (6) by means of bolts.

5. The chemical protection, gas filtering and ventilation switching valve according to claim 1, characterized in that: It also includes a shift fork limiting column (20), wherein the shift fork limiting column (20) is located on the shift fork (21) on the opposite side of the electromagnet-push type (25) push rod.

6. The chemical protection and gas filtering ventilation switching valve according to claim 4 is characterized in that: It also includes an aviation plug (27), which is fixedly mounted on a hole on the side of the rear cover (1).

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