Normally closed emergency cut-off solenoid valve

Abstract

The utility model discloses a normally closed emergency cut-off electromagnetic valve, including switch module, shell module and circuit module, the switch module includes fixed unit, action unit and auxiliary opening unit. The utility model discloses a normally closed emergency cut-off electromagnetic valve, through fixed unit and action unit link together to close the electromagnetic valve automatically, and through the recess part and steel ball to limit when closing or opening, keep structural stability, when opening manually through auxiliary opening unit and open fastly, and it through power supply circuit, first power supply circuit and second power supply circuit link together, through the capacitor discharge to the coil power supply when power failure, thereby realize the emergency cut-off when power failure, it has practicality high, security high and wide application range etc.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic valve technology, specifically relating to a normally closed emergency shut-off electromagnetic valve. Background Technology

[0002] The gas emergency shut-off solenoid valve is a safety device mainly used in gas transmission and distribution systems. In case of emergencies such as gas leaks or fires, the coil can be quickly energized by mains power, thereby triggering the valve core to cut off the gas supply and prevent the accident from escalating.

[0003] Many existing gas emergency shut-off solenoid valves have simple switch modules, which are difficult to open manually when the gas pressure is high. They also lack a power-off shut-off function, so they lose their emergency shut-off function when the power is off, which poses a certain safety hazard.

[0004] Therefore, further improvements will be made to address the aforementioned issues. Utility Model Content

[0005] The main purpose of this utility model is to provide a normally closed emergency shut-off solenoid valve. Through the linkage of a fixed unit and an actuating unit, the solenoid valve is automatically closed. During closing or opening, a groove and a steel ball provide limiting, maintaining structural stability. When manually opened, an auxiliary opening unit enables quick and effortless opening. Furthermore, through the linkage of a power supply circuit, a first power supply circuit, and a second power supply circuit, power is supplied to the coil via capacitor discharge during power failure, thereby achieving emergency shut-off in case of power failure. It has advantages such as high practicality, high safety, and wide applicability.

[0006] To achieve the above objectives, this utility model provides a normally closed emergency shut-off solenoid valve, comprising a switch module, a housing module, and a circuit module, wherein the switch module and the circuit module are both mounted in the housing module, wherein:

[0007] The outer casing module includes a lower valve body and an upper valve body, which are fixedly connected. The lower valve body is provided with a gas input end, a gas output end, and gas through holes located at the gas input end and the gas output end. The lower valve body is also provided with a balancing chamber, which is connected to the gas input end (through a small hole). The upper valve body is provided with a circuit mounting end.

[0008] The switch module includes a fixing unit, an actuation unit, and an auxiliary opening unit. The fixing unit and the actuation unit are both built into the upper valve body, and the auxiliary opening unit is built into the lower valve body. The fixing unit includes a fixed iron core, a coil mounting base, a coil, and a coil holder. The actuation unit includes a moving iron core, a moving shaft, a first compression spring mounting base, a first compression spring, a handle, and several steel balls. The auxiliary opening unit includes a balance diaphragm assembly and a push rod.

[0009] The circuit module is mounted on the circuit mounting terminal and includes a power supply circuit, a first power supply circuit, and a second power supply circuit. The first power supply circuit and the second power supply circuit are electrically connected to the output terminal of the power supply circuit, wherein:

[0010] The power supply circuit includes a power interface P1, a rectifier bridge BD1, a power management chip U1, and a transformer T1. The power interface P1 is electrically connected to the transformer T1 through the rectifier bridge BD1, and the transformer T1 is electrically connected to the power management chip U1. The output terminal of the transformer T1 is electrically connected to one end of the resistor R13 through a diode D1.

[0011] The first power supply circuit includes a diode D2, a capacitor C7, and a transistor T2. The anode of the diode D2 is electrically connected to the other end of the resistor R13. One cathode of the diode D2 is grounded through the capacitor C7, and the other is electrically connected to the source of the transistor T2. One drain of the transistor T2 is electrically connected to the second end of the coil load interface P2, and the other is electrically connected to the first end of the coil load interface P2 through a diode D8. The end of the capacitor C7 furthest from the diode D2 is electrically connected to the anode of the diode D8. A resistor R14 is connected between the source and gate of the transistor T2, and the gate of the transistor T2 is grounded in sequence through a resistor R15 and a transistor T4.

[0012] The second power supply circuit includes a diode D7, a capacitor C8, and a transistor T3. The anode of the diode D7 is electrically connected to the other end of the resistor R13. One cathode of the diode D7 is grounded through the capacitor C8, and the other is electrically connected to the source of the transistor T3. The drain of the transistor T3 is electrically connected to the second end of the coil load interface P2. The end of the capacitor C8 away from the diode D7 is electrically connected to the first end of the coil load interface P2. A resistor R17 is connected between the source and the gate of the transistor T3, and the gate of the transistor T3 is grounded in sequence through a resistor R19 and a transistor T5.

[0013] As a further preferred technical solution of the above technical solution, for the fixed unit, the fixed iron core includes an integrally formed iron block body and a tube sleeve, the coil mounting seat is sleeved on the fixed iron core and the coil is mounted on the coil mounting seat, and the coil seat surrounds the coil and the fixed iron core;

[0014] For the aforementioned actuation unit, the moving iron core is housed within the sleeve, and the moving shaft passes through the moving iron core and the iron block body sequentially from top to bottom. The first compression spring mounting seat is sleeved on the moving shaft, and the bottom end of the first compression spring mounting seat is mounted on the iron block body. The first compression spring mounting seat has several steel ball mounting holes, and the steel balls are mounted in the steel ball mounting holes. One end of the first compression spring is mounted on the first compression spring mounting seat, and the other end of the first compression spring abuts against the moving iron core. The handle is mounted on the top end of the moving shaft. The moving iron core has a first groove, and the moving shaft has a second groove, with the first groove and the second groove having opposite directions.

[0015] For the auxiliary opening unit, the balance membrane assembly covers the balance chamber and the balance membrane assembly surrounds and is fixed to the bottom of the push rod, with the top of the push rod close to the gas passage.

[0016] As a further preferred embodiment of the above technical solution, the top of the movable shaft is provided with a central shaft nut, the handle is sleeved on the top of the movable shaft, and the handle is provided with a first limiting block inside;

[0017] A magnetic shielding sheet is provided at one end of the iron block body near the moving iron core;

[0018] The coil is connected to a wire;

[0019] A valve plate is installed at the bottom of the movable shaft, and the valve plate is used to cover the gas passage.

[0020] As a further preferred embodiment of the above technical solution, the cathode of diode D2 is also grounded through resistor R12 and light-emitting diode LED1; the cathode of diode D7 is also grounded through resistor R16 and light-emitting diode LED2; and the coil load interface P2 is used to connect the coil.

[0021] As a further preferred embodiment of the above technical solution, the upper valve body is further provided with a top cover and a circuit end cover, the top cover covering the handle and the circuit end cover covering the circuit module.

[0022] As a further preferred embodiment of the above technical solution, the circuit module is also provided with a DIP switch. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model (the top cover and circuit end cover are hidden).

[0024] Figure 2 This is a cross-sectional view of the present invention (closed state).

[0025] Figure 3This is a cross-sectional view of the present invention (open state).

[0026] Figure 4 This is a schematic diagram of the switch module of this utility model.

[0027] Figure 5 This is a cross-sectional view (open state) of the switch module of this utility model.

[0028] Figure 6 This is a cross-sectional view (off state) of the switch module of this utility model.

[0029] Figure 7 This is a schematic diagram of the circuit module of this utility model.

[0030] The reference numerals in the accompanying drawings include: 100, switch module; 110, fixing unit; 111, fixed iron core; 1111, iron block body; 1112, sleeve; 1113, magnetic shielding sheet; 112, coil mounting base; 113, coil; 1131, wire; 114, coil holder; 120, actuating unit; 121, moving iron core; 1211, first groove; 122, moving shaft; 1221, second groove; 1222, central shaft nut; 1224, valve plate; 123, first pressure... Spring mounting base; 1231, steel ball mounting hole; 124, first compression spring; 125, handle; 1251, first limit block; 126, steel ball; 130, auxiliary opening unit; 131, balance diaphragm assembly; 132, push rod; 200, outer shell module; 210, lower valve body; 211, gas input end; 212, gas output end; 213, gas through hole; 214, balance chamber; 220, upper valve body; 221, circuit mounting end; 222, top cover; 300, circuit module. Detailed Implementation

[0031] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0032] This utility model discloses a normally closed emergency shut-off solenoid valve. The specific embodiments of the utility model are further described below with reference to preferred embodiments.

[0033] In the embodiments of this utility model, those skilled in the art will note that the gas and the like involved in this utility model can be considered as prior art.

[0034] Preferred embodiment.

[0035] like Figure 1-7 As shown, this utility model discloses a normally closed emergency shut-off solenoid valve, including a switch module 100, a housing module 200, and a circuit module 300. Both the switch module 100 and the circuit module 300 are mounted on the housing module 200, wherein:

[0036] The outer casing module 200 includes a lower valve body 210 and an upper valve body 220, which are fixedly connected. The lower valve body 210 is provided with a gas input terminal 211, a gas output terminal 212, and gas through holes 213 located at the gas input terminal 211 and the gas output terminal 212. The lower valve body 211 is also provided with a balance chamber 214, and the balance chamber 214 (through a small hole) is connected to the gas input terminal 211. The upper valve body 220 is provided with a circuit mounting terminal 221.

[0037] The switch module 100 includes a fixing unit 110, an actuation unit 120, and an auxiliary opening unit 130 (for high-voltage balancing). The fixing unit 110 and the actuation unit 120 are both built into the upper valve body 220, and the auxiliary opening unit 130 is built into the lower valve body 210. The fixing unit 110 includes a fixed iron core 111, a coil mounting base 112, a coil 113, and a coil holder 114. The actuation unit 120 includes a moving iron core 121, a moving shaft 122, a first compression spring mounting base 123, a first compression spring 124, a handle 125, and several steel balls 126. The auxiliary opening unit 130 includes a balancing diaphragm assembly 131 and a push rod 132.

[0038] The circuit module 300 is mounted on the circuit mounting terminal 221, and the circuit module 300 includes a power supply circuit, a first power supply circuit, and a second power supply circuit. The first power supply circuit and the second power supply circuit are electrically connected to the output terminal of the power supply circuit, wherein:

[0039] The power supply circuit includes a power interface P1 (connected to AC power), a rectifier bridge BD1, a power management chip U1, and a transformer T1. The power interface P1 is electrically connected to the transformer T1 through the rectifier bridge BD1, and the transformer T1 is electrically connected to the power management chip U1. The output terminal (i.e., pin 2) of the transformer T1 is electrically connected to one end of the resistor R13 through a diode D1.

[0040] The first power supply circuit includes a diode D2, a capacitor C7, and a transistor T2. The anode of the diode D2 is electrically connected to the other end of the resistor R13. One cathode of the diode D2 is grounded through the capacitor C7, and the other is electrically connected to the source of the transistor T2. One drain of the transistor T2 is electrically connected to the second end of the coil load interface P2, and the other is electrically connected to the first end of the coil load interface P2 through a diode D8. The end of the capacitor C7 furthest from the diode D2 is electrically connected to the anode of the diode D8. A resistor R14 is connected between the source and gate of the transistor T2, and the gate of the transistor T2 is grounded in sequence through a resistor R15 and a transistor T4.

[0041] The second power supply circuit includes a diode D7, a capacitor C8, and a transistor T3. The anode of the diode D7 is electrically connected to the other end of the resistor R13. One cathode of the diode D7 is grounded through the capacitor C8, and the other is electrically connected to the source of the transistor T3. The drain of the transistor T3 is electrically connected to the second end of the coil load interface P2 (connected to the coil of the solenoid valve). The end of the capacitor C8 away from the diode D7 is electrically connected to the first end of the coil load interface P2. A resistor R17 is connected between the source and the gate of the transistor T3, and the gate of the transistor T3 is grounded in sequence through a resistor R19 and a transistor T5.

[0042] Specifically, for the fixed unit 110, the fixed iron core 111 includes an integrally formed iron block body 1111 and a tube sleeve 1112, the coil mounting seat 112 is sleeved on the fixed iron core 111 and the coil 113 is mounted on the coil mounting seat 112, and the coil seat 114 surrounds the coil 113 and the fixed iron core 111.

[0043] For the actuation unit 120, the moving iron core 121 is built into the sleeve 1112, and the moving shaft 122 passes through the moving iron core 121 and the iron block body 1111 from top to bottom. The first compression spring mounting seat 123 is sleeved on the moving shaft 122, and the bottom end of the first compression spring mounting seat 123 is mounted on the iron block body 1111. The first compression spring mounting seat 123 is provided with a plurality of steel ball mounting holes 1231, and the steel ball 126 is mounted in the steel ball mounting holes 1231. One end of the first compression spring 124 is mounted on the first compression spring mounting seat 123, and the other end of the first compression spring 124 abuts against the moving iron core 121. The handle 125 is mounted on the top end of the moving shaft 122. The moving iron core 121 is provided with a first groove 1211, and the moving shaft 122 is provided with a second groove 1221. The first groove 1211 and the second groove 1221 are in opposite directions.

[0044] For the auxiliary opening unit 130, the balance membrane assembly 131 covers the balance chamber 214 and the balance membrane assembly 131 surrounds and is fixed to the bottom of the top rod 132, and the top of the top rod 132 is close to the gas passage 213.

[0045] More specifically, the top of the movable shaft 122 is provided with a central shaft nut 1222, the handle 125 is sleeved on the top of the movable shaft 122 and the handle 125 is provided with a first limiting block 1251 inside; the iron block body 1111 is provided with a magnetic shielding sheet 1113 at one end near the moving iron core; the coil 113 is connected to the wire 1131 (thereby connecting to the coil load interface P2); the bottom of the movable shaft 122 is equipped with a valve plate 1224, which is used to cover the gas passage hole 213.

[0046] Furthermore, the cathode of diode D2 is grounded through resistor R12 and light-emitting diode LED1; the cathode of diode D7 is grounded through resistor R16 and light-emitting diode LED2; and coil load interface P2 is used to connect the coil.

[0047] Furthermore, the upper valve body 220 is also provided with a top cover 222 and a circuit end cover (not shown), the top cover 222 covering the handle 125 and the circuit end cover covering the circuit module 300.

[0048] Preferably, the circuit module further includes a DIP switch, which has a first switch and a second switch, each switch having an ON and OFF DIP switch position, wherein:

[0049] For the first switch, ON indicates a 6-second delay before power failure, and OFF indicates an instantaneous action upon power failure.

[0050] For the second switch, ON indicates that self-test is enabled, and OFF indicates that self-test is disabled. Enabling self-test mode means that the valve will activate once every time power is applied to confirm whether the valve is normal. After activation, it needs to be manually pulled up. After being pulled up, it will work normally.

[0051] For the switching module, when the emergency shut-off solenoid valve is in the open state, such as Figure 3 and 5As shown, gas is sequentially transmitted from the gas input end 211, the gas through-hole 213, and the gas output end 212. The steel ball 126 is located in the steel ball mounting hole 1231 and simultaneously locks the second groove 1221 of the moving shaft (preventing the moving shaft from moving downwards due to its own weight, etc.), thus preventing the valve plate 1224 from moving downwards and closing the gas through-hole 213. In an emergency requiring the solenoid valve to be closed (controlled by the circuit module), the coil 113 is energized through the wire 1131, thereby generating electromagnetic force in conjunction with the fixed iron core 111, causing the moving iron core 121 to move downwards (or it can be manually closed by applying downward force to the handle, causing the handle to move the moving iron core downwards). The first groove 1211 moves downwards, causing the steel ball 126 to move to the first groove 1211 and release its restriction on the second groove 1221, causing the moving shaft 122 to move downwards (due to gravity and other driving forces, etc.), ultimately driving the valve plate 1224 downwards to close the gas through-hole 213. Figure 2 and 6 As shown;

[0052] When it needs to be opened (opening must be manual, as the situation needs to be observed and judged), force is applied upwards to the handle 125, causing it to move upwards until the first limit block 1251 abuts against the central shaft nut 1222, thereby driving the moving shaft 122 upwards. This causes the valve plate 1224 to move upwards, opening the gas passage 213. When the second groove 1221 moves to the position of the steel ball 126, the compression force of the first compression spring 124 causes the top of the first compression spring 124 to lift the moving iron core 121. This causes the cut surface of the first groove 1211 to push the steel ball 126 towards the second groove 1221, thus causing the steel ball 126 to lock into the second groove 1221. The moving shaft 122 is then limited and fixed, preventing it from moving downwards. Figure 3 and 5 As shown.

[0053] This invention can also be closed manually by applying downward force to the handle, causing the handle to move the moving iron core downward, thereby causing the first groove to move downward.

[0054] For the auxiliary opening unit 130, where:

[0055] (Sometimes, due to the high pressure of the gas, when the solenoid valve is opened, the gas enters from the gas input end and exerts a downward force on the valve plate, thus restricting the upward movement of the valve plate and preventing it from opening.) When the solenoid valve needs to be opened, the gas enters the balance chamber 214 from the gas input end 211 through the auxiliary hole, so that the gas provides an upward force on the balance diaphragm assembly 131, driving the push rod 132 to move upward, thereby opening the valve plate 1224 covering the gas through hole 213 (when the gas is under high pressure, the push rod opens the valve plate to release the high pressure, and finally the moving iron core moves upward normally under the drive of electromagnetic force, etc.).

[0056] For the circuit module, when the mains power is normally supplied, the coil of the coil load interface P2 is powered through the power supply circuit, so as to cut off the power supply in case of an emergency.

[0057] When power is lost, this invention provides power to the coil through a double safety mechanism of a first power supply circuit and a second power supply circuit. Even if one power supply circuit fails, the other power supply circuit can still be confirmed to be supplying power to the coil. Taking the first power supply circuit as an example, during normal power supply, capacitor C7 is charged and stores electrical energy. The principle of power supply to P2 during power loss is as follows:

[0058] A capacitor's characteristic is its ability to store and release electrical charge. During normal operation, C7 is charged in the circuit, accumulating charge between its plates and storing electric field energy. After power is cut off, a voltage exists across its terminals, attempting to release the charge through an external circuit. At this time, C7 forms a discharge path through a circuit consisting of resistors R14 and R15, transistor T4, etc. The voltage across C7 causes current to flow out, ultimately supplying power to the coil and enabling the emergency shut-off function of the solenoid valve during power failure.

[0059] It is worth mentioning that the gas and other technical features involved in this utility model patent application should be regarded as prior art. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can be adopted using conventional choices in the field, and should not be regarded as the inventive point of this utility model patent. This utility model patent will not be further elaborated in detail.

[0060] For those skilled in the art, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A normally closed emergency shut-off solenoid valve, characterized in that, It includes a switch module, a housing module, and a circuit module, wherein the switch module and the circuit module are both mounted in the housing module, wherein: The outer casing module includes a lower valve body and an upper valve body, which are fixedly connected. The lower valve body is provided with a gas input end, a gas output end, and gas through holes located at the gas input end and the gas output end. The lower valve body is also provided with a balance chamber and the balance chamber is connected to the gas input end. The upper valve body is provided with a circuit mounting end. The switch module includes a fixing unit, an actuation unit, and an auxiliary opening unit. The fixing unit and the actuation unit are both built into the upper valve body, and the auxiliary opening unit is built into the lower valve body. The fixing unit includes a fixed iron core, a coil mounting base, a coil, and a coil holder. The actuation unit includes a moving iron core, a moving shaft, a first compression spring mounting base, a first compression spring, a handle, and several steel balls. The auxiliary opening unit includes a balance diaphragm assembly and a push rod. The circuit module is mounted on the circuit mounting terminal and includes a power supply circuit, a first power supply circuit, and a second power supply circuit. The first power supply circuit and the second power supply circuit are electrically connected to the output terminal of the power supply circuit, wherein: The power supply circuit includes a power interface P1, a rectifier bridge BD1, a power management chip U1, and a transformer T1. The power interface P1 is electrically connected to the transformer T1 through the rectifier bridge BD1, and the transformer T1 is electrically connected to the power management chip U1. The output terminal of the transformer T1 is electrically connected to one end of the resistor R13 through a diode D1. The first power supply circuit includes a diode D2, a capacitor C7, and a transistor T2. The anode of the diode D2 is electrically connected to the other end of the resistor R13. One cathode of the diode D2 is grounded through the capacitor C7, and the other is electrically connected to the source of the transistor T2. One drain of the transistor T2 is electrically connected to the second end of the coil load interface P2, and the other is electrically connected to the first end of the coil load interface P2 through a diode D8. The end of the capacitor C7 furthest from the diode D2 is electrically connected to the anode of the diode D8. A resistor R14 is connected between the source and gate of the transistor T2, and the gate of the transistor T2 is grounded in sequence through a resistor R15 and a transistor T4. The second power supply circuit includes a diode D7, a capacitor C8, and a transistor T3. The anode of the diode D7 is electrically connected to the other end of the resistor R13. One cathode of the diode D7 is grounded through the capacitor C8, and the other is electrically connected to the source of the transistor T3. The drain of the transistor T3 is electrically connected to the second end of the coil load interface P2. The end of the capacitor C8 away from the diode D7 is electrically connected to the first end of the coil load interface P2. A resistor R17 is connected between the source and the gate of the transistor T3, and the gate of the transistor T3 is grounded in sequence through a resistor R19 and a transistor T5.

2. The normally closed emergency shut-off solenoid valve according to claim 1, characterized in that, For the fixed unit, the fixed iron core includes an integrally formed iron block body and a tube sleeve, the coil mounting seat is sleeved on the fixed iron core and the coil is mounted on the coil mounting seat, and the coil seat surrounds the coil and the fixed iron core; For the aforementioned actuation unit, the moving iron core is housed within the sleeve, and the moving shaft passes through the moving iron core and the iron block body sequentially from top to bottom. The first compression spring mounting seat is sleeved on the moving shaft, and the bottom end of the first compression spring mounting seat is mounted on the iron block body. The first compression spring mounting seat has several steel ball mounting holes, and the steel balls are mounted in the steel ball mounting holes. One end of the first compression spring is mounted on the first compression spring mounting seat, and the other end of the first compression spring abuts against the moving iron core. The handle is mounted on the top end of the moving shaft. The moving iron core has a first groove, and the moving shaft has a second groove, with the first groove and the second groove having opposite directions. For the auxiliary opening unit, the balance membrane assembly covers the balance chamber and the balance membrane assembly surrounds and is fixed to the bottom of the push rod, with the top of the push rod close to the gas passage.

3. A normally closed emergency shut-off solenoid valve according to claim 2, characterized in that, The top of the movable shaft is provided with a central shaft nut, the handle is sleeved on the top of the movable shaft and the handle is provided with a first limiting block inside; A magnetic shielding sheet is provided at one end of the iron block body near the moving iron core; The coil is connected to a wire; A valve plate is installed at the bottom of the movable shaft, and the valve plate is used to cover the gas passage.

4. A normally closed emergency shut-off solenoid valve according to claim 3, characterized in that, The cathode of diode D2 is also grounded through resistor R12 and LED1; the cathode of diode D7 is also grounded through resistor R16 and LED2; the coil load interface P2 is used to connect the coil.

5. A normally closed emergency shut-off solenoid valve according to claim 4, characterized in that, The upper valve body is also provided with a top cover and a circuit end cover, the top cover covering the handle and the circuit end cover covering the circuit module.

6. A normally closed emergency shut-off solenoid valve according to claim 5, characterized in that, The circuit module is also equipped with DIP switches.

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