System for preventing gas leakage of pressurization station

Abstract

The utility model provides a system for preventing gas leakage of a pressurization station, and relates to the technical field of gas safety, the system comprises a butterfly valve control box, a signal cable and a blind plate valve control box, the butterfly valve control box comprises an in-place closing relay circuit, an in-place closing indication circuit and an in-place closing expansion relay circuit; the in-place closing indication circuit is connected to the in-place closing relay circuit in parallel, and the in-place closing expansion relay circuit is connected to the in-place closing indication circuit in parallel; the butterfly valve control box is in signal connection with the blind plate valve control box through a signal cable; the blind plate valve control box comprises a loosening control circuit, an operation indicating circuit and a stop indicating circuit. The operation indicating circuit is connected to the loosening control circuit in parallel, and the stop indicating circuit is connected to the operation indicating circuit in parallel. The blind plate valve can be operated only when the butterfly valve is completely closed. When the butterfly valve is in a running state, the blind plate valve cannot be operated, gas leakage caused by misoperation of the blind plate valve is prevented, and safe and stable production is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of gas safety technology, especially to a system for preventing gas leakage of a pressurizing station. BACKGROUND

[0002] A large amount of blast furnace gas and coke oven gas is generated in the production process of metallurgical enterprises. In order to realize efficient utilization of energy, the industry generally adopts the mode of a gas pressurizing station at present, collects the gas generated by the gas source, and sends the gas to each user after pressurization treatment.

[0003] In the existing mode of a gas pressurizing station, the blind plate valves at the inlet and outlet are in the fully open position when the pressurizing machine is working. The inlet gas and outlet gas are accurately controlled by adjusting the opening degree of the butterfly valve. Therefore, when the equipment is overhauled, the butterfly valve is closed first, and then the blind plate valve is closed after the butterfly valve is closed in place, so as to cut off the gas and ensure the safety of the operators. However, during the operation of closing and opening the blind plate valve, the clamping motor must be loosened first to loosen the clamping mechanism, so that the valve plate of the blind plate valve at the inlet and outlet and the clamping mechanism have a gap, and then the gas leaks to the outside of the pipeline through the gap.

[0004] Therefore, how to provide a system for preventing gas leakage of a pressurizing station, so as to prevent gas leakage caused by misoperation of the blind plate valve and realize safe and stable operation of the pressurizing station has become a technical problem to be solved urgently. CONTENT OF THE UTILITY MODEL

[0005] The embodiment of the application provides a system for preventing gas leakage of a pressurizing station, which can ensure that the blind plate valve can be operated only when the butterfly valve is completely closed. When the butterfly valve is in the open state, the blind plate valve cannot be operated in the field or in the control room, so as to prevent gas leakage caused by misoperation of the blind plate valve and realize safe and stable operation.

[0006] The application provides a system for preventing gas leakage of a pressurizing station, which comprises a butterfly valve control box, a signal cable and a blind plate valve control box, wherein:

[0007] The butterfly valve control box comprises a closing-to-position relay circuit, a closing-to-position indication circuit and a closing-to-position extension relay circuit; the closing-to-position indication circuit is connected in parallel to the closing-to-position relay circuit, and the closing-to-position extension relay circuit is connected in parallel to the closing-to-position indication circuit;

[0008] The butterfly valve control box is connected to the blind plate valve control box through the signal cable.

[0009] The blind plate valve control box comprises a loose control circuit, a running indication circuit and a stop indication circuit; the running indication circuit is connected in parallel to the loose control circuit, and the stop indication circuit is connected in parallel to the running indication circuit.

[0010] Optionally, the close-to-position relay circuit comprises a close-to-position contact of the butterfly valve head and a close-to-position relay, wherein a coil of the close-to-position relay is connected in series with the close-to-position contact, and the close-to-position relay circuit is configured to make the coil of the close-to-position relay be powered when the close-to-position contact is closed.

[0011] Optionally, the close-to-position indication circuit comprises a normally open contact of the close-to-position relay and a butterfly valve close-to-position indication lamp, wherein the normally open contact of the close-to-position relay is connected in series with the butterfly valve close-to-position indication lamp, and the close-to-position indication circuit is configured to make the normally open contact of the close-to-position relay be closed and the butterfly valve close-to-position indication lamp be lighted up when the coil of the close-to-position relay is powered, so as to prompt that the butterfly valve has been completely closed.

[0012] Optionally, the close-to-position extension relay circuit comprises a coil of a close-to-position acquisition relay, the coil of the close-to-position acquisition relay is connected in parallel to the butterfly valve close-to-position indication lamp, and the close-to-position extension relay circuit is configured to make the coil of the close-to-position acquisition relay be powered when the butterfly valve close-to-position indication lamp is lighted up.

[0013] Optionally, the loose control circuit comprises a normally closed control switch, a start button, a normally open contact of a close-to-position acquisition relay, a coil of a contactor, a first normally open contact of the contactor and a normally closed contact of a thermal relay, wherein the control switch, the start button, the normally open contact of the close-to-position acquisition relay, the coil of the contactor and the normally closed contact of the thermal relay are connected in series, and the loose control circuit is configured to make the normally open contact of the close-to-position acquisition relay be closed when the coil of the close-to-position acquisition relay is powered, so as to make the coil of the contactor be powered by opening the start button.

[0014] The first normally open contact of the contactor is connected in parallel to the start button, the start button is electrically connected to the blind plate valve, and the loose control circuit is configured to make the first normally open contact of the contactor be closed when the coil of the contactor is powered, so as to control the blind plate valve to perform a loose operation by closing the start button.

[0015] Optionally, the butterfly valve control box sends a power signal of the close-to-position acquisition relay to a normally open contact of a close-to-position acquisition relay in the blind plate valve control box through the signal cable, so as to make the normally open contact of the close-to-position acquisition relay be closed.

[0016] Optionally, the running indication circuit comprises a second normally open contact of the contactor and a blind plate valve running indication lamp, wherein the second normally open contact of the contactor is connected in series with the blind plate valve running indication lamp, and the running indication circuit is configured to close the second normally open contact of the contactor when the coil of the contactor is powered, and control the blind plate valve running indication lamp to light up by turning off the start button, so as to prompt that the blind plate valve is in a running state.

[0017] Optionally, the stopping indication circuit comprises a normally closed contact of the contactor and a blind plate valve stopping indication lamp, wherein the normally closed contact of the contactor is connected in series with the blind plate valve stopping indication lamp, and the stopping indication circuit is configured to control the blind plate valve stopping indication lamp to light up by turning on the start button when the coil of the contactor is not powered, so as to prompt that the blind plate valve is in a stopping state.

[0018] Optionally, the signal cable is installed in a combination of a galvanized pipe and an anti-explosion flexible pipe.

[0019] Optionally, the blind plate valve control box further comprises a fuse connected in series with the loosening control circuit, and configured to perform circuit protection when an abnormality occurs in the circuit in the system for preventing gas leakage of the pressurizing station.

[0020] The system for preventing gas leakage of the pressurizing station provided by the embodiments of the present application ensures that the blind plate valve can be operated only when the butterfly valve is completely closed, by interlocking control of the butterfly valve and the blind plate valve and monitoring the running states of the blind plate valve and the butterfly valve. When the butterfly valve is in a running state, the blind plate valve cannot be operated, thereby preventing gas leakage caused by misoperation of the blind plate valve and ensuring safe and stable production.

[0021] The system for preventing gas leakage of the pressurizing station provided by the present application, other advantages, objects and features of the present application will be embodied in part by the following description, and part will be understood by those skilled in the art through research and practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the exemplary embodiments. The accompanying drawings are included to provide a description of the exemplary embodiments and are not meant to limit the present application. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the drawings:

[0023] Figure 1 A structural schematic diagram of a system for preventing gas leakage of a pressurizing station provided by the embodiments of the present application;

[0024] Figure 2 A schematic diagram of a configuration process of an existing gas pressurizing station provided by the embodiments of the present application;

[0025] wherein, Figure 1 The correspondence between the reference signs and the names of the components is as follows:

[0026] 10 butterfly valve control box; 20 signal cable; 30 blind valve control box. DETAILED DESCRIPTION

[0027] In order to better understand the technical solutions provided by the embodiments of the present specification, the technical solutions of the embodiments of the present specification will be described in detail below through the accompanying drawings and specific embodiments. It should be understood that the specific features in the embodiments of the present specification and the embodiments are detailed descriptions of the technical solutions of the embodiments of the present specification, and not limitations of the technical solutions of the present specification. In the case of no conflict, the technical features in the embodiments of the present specification and the embodiments can be combined with each other.

[0028] In this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. The term "two or more" includes two or more than two.

[0029] The current configuration process of the coal gas pressurizing station is as shown in Figure 2 The coal gas in the coal gas pipe network enters the pressurizing machine through the inlet butterfly valve and the inlet blind valve, and the pressurized coal gas is sent to the user through the outlet butterfly valve and the outlet blind valve. When the pressurizing machine is working, the outlet blind valve and the inlet blind valve are both in the fully open position, and by adjusting the opening degree of the inlet butterfly valve and the outlet butterfly valve, the inlet coal gas and the outlet coal gas can be accurately controlled. When the equipment is overhauled, the inlet butterfly valve and the outlet butterfly valve are first closed, and then the blind valve is closed after the butterfly valve is closed in place, so as to realize the isolation of coal gas and ensure the safety of the operation and maintenance personnel.

[0030] Since the blind plate valve is composed of two stroke mechanisms of the clamping plate and the walking plate, when the blind plate valve is closed, the clamping plate motor first loosens the clamping mechanism, so that the valve body is loosened. Then the walking plate motor acts to drive the gate plate to rotate counterclockwise until the gate plate is completely closed. The clamping motor acts again to clamp the valve body, and the closing process is completed. When the blind plate valve is opened, the clamping plate motor first loosens the clamping mechanism, so that the valve body is loosened. Then the walking plate motor acts to drive the gate plate to rotate clockwise until the gate plate is completely opened. The clamping motor acts again to clamp the valve body, and the opening process is completed. That is, whether in the closing or opening operation process of the blind plate valve, the loosening action is first performed, so that a gap appears between the valve plate of the blind plate valve and the clamping mechanism. If the butterfly valve is not in the closed position at this time, the coal gas will flow into the blind plate valve and leak to the outside of the pipeline through the gap of the blind plate valve, which not only causes the running personnel to be poisoned by inhaling coal gas, but also has the possibility of explosion when encountering an open flame, with unpredictable consequences.

[0031] Therefore, the present application provides a system for preventing coal gas leakage of a pressurizing station, which can ensure that the blind plate valve can be operated only when the butterfly valve is completely closed. When the butterfly valve is in the open state, the blind plate valve cannot be operated in the field or in the control room, thereby preventing coal gas leakage caused by misoperation of the blind plate valve and realizing safe and stable operation.

[0032] According to the embodiments of the present application, the present application provides a system for preventing coal gas leakage of a pressurizing station, comprising: a butterfly valve control box, a signal cable and a blind plate valve control box, wherein:

[0033] The butterfly valve control box comprises a closed-to-position relay circuit, a closed-to-position indication circuit and a closed-to-position extension relay circuit; the closed-to-position indication circuit is connected in parallel to the closed-to-position relay circuit, and the closed-to-position extension relay circuit is connected in parallel to the closed-to-position indication circuit;

[0034] The butterfly valve control box is connected to the blind plate valve control box through the signal cable;

[0035] The blind plate valve control box comprises a loosening control circuit, a running indication circuit and a stopping indication circuit; the running indication circuit is connected in parallel to the loosening control circuit, and the stopping indication circuit is connected in parallel to the running indication circuit.

[0036] For example, referring to Figure 1The system for preventing gas leakage of pressurizing station provided by the application comprises a butterfly valve control box (10), a signal cable (20) and a blind plate valve control box (30), wherein the butterfly valve control box (10) comprises a close-to-position relay circuit, a close-to-position indication circuit and a close-to-position extension relay circuit, and the blind plate valve control box (30) comprises a fuse, a loosening control circuit, a running indication circuit and a stopping indication circuit. In the whole system for preventing gas leakage of pressurizing station, the power supply is AC 220V (AC 220V) which is connected to the butterfly valve control box (10) and the blind plate valve control box (30) through the zero line N and the fire line, thereby providing power for the whole control box. In the butterfly valve control box (10), when the close-to-position relay circuit is powered on, on the one hand, the close-to-position indication circuit connected in parallel with the close-to-position relay circuit is turned on, at this time, the butterfly valve close-to-position indication lamp in the close-to-position indication circuit is turned on, thereby showing the user that the butterfly valve has been completely closed. On the other hand, the close-to-position extension relay circuit is powered on, and the power-on signal is transmitted to the blind plate valve control box (30) through the signal cable (20). In the blind plate valve control box (30), the loosening control circuit is powered on by closing the start button SF, and the running indication circuit connected in parallel with the loosening control circuit is turned on, and the stopping indication circuit is turned off, at this time, the blind plate valve running indication lamp in the running indication circuit is turned on, and the blind plate valve stopping indication lamp in the stopping indication circuit is turned off, thereby prompting the user that the blind plate valve is running. The connection between the butterfly valve control box (10) and the blind plate valve control box (30) through the signal cable (20) can ensure that only when the butterfly valve close-to-position indication lamp in the butterfly valve control box (10) is turned on, prompting that the butterfly valve has been completely closed, the circuit in the blind plate valve control box (30) can be powered on, thereby controlling the blind plate valve through the blind plate valve control box (30).

[0037] In some examples, the close-to-position relay circuit comprises a close-to-position contact of the butterfly valve head and a close-to-position relay, wherein the coil of the close-to-position relay is connected in series with the close-to-position contact, and the close-to-position relay circuit is configured to cause the coil of the close-to-position relay to be powered on when the close-to-position contact is closed.

[0038] For example, the close-to-position relay circuit comprises a close-to-position contact KOF of the butterfly valve head and a close-to-position relay K1, and the close-to-position relay K1 is powered on when the close-to-position contact KOF of the butterfly valve head is closed.

[0039] In some examples, the close-to-position indication circuit comprises a normally open contact of the close-to-position relay and a butterfly valve close-to-position indication lamp, wherein the normally open contact of the close-to-position relay is connected in series with the butterfly valve close-to-position indication lamp, and the close-to-position indication circuit is configured to cause the normally open contact of the close-to-position relay to be closed and the butterfly valve close-to-position indication lamp to be turned on when the coil of the close-to-position relay is powered on, thereby prompting that the butterfly valve has been completely closed.

[0040] For example, the close-to-position indication circuit includes the normally open contact K1-1 of the close-to-position relay K1 and the close-to-position indication lamp of the butterfly valve. When the close-to-position contact KOF of the butterfly valve head is closed, the close-to-position relay K1 is powered, the normally open contact K1-1 of the close-to-position relay K1 is closed, and the close-to-position indication lamp of the butterfly valve control box (10) is lit, indicating that the butterfly valve has been completely closed.

[0041] In some examples, the close-to-position extension relay circuit includes a coil of a close-to-position collection relay, the coil of the close-to-position collection relay is connected in parallel to the close-to-position indication lamp of the butterfly valve, and the close-to-position extension relay circuit is used to power the coil of the close-to-position collection relay when the close-to-position indication lamp of the butterfly valve is lit.

[0042] For example, the close-to-position extension relay circuit includes a close-to-position collection relay K2. Because the close-to-position relay K1 has limited contacts, the close-to-position relay circuit cannot provide “surplus” contacts to the blind plate valve control box (30), and therefore, the close-to-position collection relay K2 is installed in the butterfly valve control box (10), and the coil loop is connected to the close-to-position indication circuit. The specific connection method is shown in the dashed box in the butterfly valve control box in Figure 2 Further, when the close-to-position indication lamp of the butterfly valve is lit, the coil of the close-to-position collection relay K2 is powered to assist the signal contact K2-1 of the close-to-position collection relay K2 to be closed.

[0043] In some examples, the butterfly valve control box sends the power signal of the close-to-position collection relay to the normally open contact of the close-to-position collection relay in the blind plate valve control box through a signal cable, so that the normally open contact of the close-to-position collection relay is closed.

[0044] For example, the power signal of the close-to-position collection relay K2 is sent to the signal contact K2-1 of the close-to-position collection relay in the blind plate valve control box (30) through a signal cable (20), so as to control the closing of the signal contact K2-1 of the close-to-position collection relay.

[0045] In some examples, the loosening control circuit includes a normally closed control switch, a start button, a normally open contact of a close-to-position collection relay, a coil of a contactor, a first normally open contact of the contactor, and a normally closed contact of a thermal relay, wherein the control switch, the start button, the normally open contact of the close-to-position collection relay, the coil of the contactor, and the normally closed contact of the thermal relay are connected in series, and the loosening control circuit is used to close the normally open contact of the close-to-position collection relay when the coil of the close-to-position collection relay is powered, so as to power the coil of the contactor by opening the start button.

[0046] The first normally open contact of the contactor is connected in parallel with the start button, and the start button is electrically connected with the blind plate valve. The release control circuit is used to close the first normally open contact of the contactor when the coil of the contactor is powered on, so as to control the blind plate valve to be released by closing the start button.

[0047] For example, the release control circuit includes a normally closed control switch SS, a start button SF, a signal contact K2-1 of the closing-to-position acquisition relay, a contactor KM, a first normally open contact KM1 of the contactor, and a normally closed contact KH of the thermal relay. Figure 2 As shown by the dashed box in the blind plate valve control box (30), by modifying the circuit in the blind plate valve control box (30), the signal contact K2-1 of the closing-to-position acquisition relay K2 is connected to the blind plate valve control box (30), so that the current blind plate valve can only be released by the start button SF after the current butterfly valve is completely closed. If the current butterfly valve is not completely closed, the blind plate valve cannot be released. Thus, the problem of opening the blind plate valve to cause gas leakage when the butterfly valve is not closed tightly is prevented.

[0048] In some examples, the running indication circuit includes a second normally open contact of the contactor and a blind plate valve running indication lamp, wherein the second normally open contact of the contactor is connected in series with the blind plate valve running indication lamp. The running indication circuit is used to close the second normally open contact of the contactor when the coil of the contactor is powered on, so as to control the blind plate valve running indication lamp to be turned on by closing the start button, so as to prompt that the blind plate valve is in a running state.

[0049] For example, the running indication circuit includes a second normally open contact KM2 of the contactor KM and a blind plate valve running indication lamp HG. When the current blind plate valve is in a running state, the blind plate valve running indication lamp HG is turned on. For example, when the start button SF is pressed, the coil of the contactor KM is powered on, the first normally open contact KM1 and the second normally open contact KM2 of the contactor KM are closed, and the motor and other loads start to run. At this time, the running indication circuit is turned on, and the green blind plate valve running indication lamp HG is turned on, which is used to directly display that the current blind plate valve is running and the equipment is in a working state.

[0050] In some examples, the stop indication circuit includes a normally closed contact of the contactor and a blind plate valve stop indication lamp, wherein the normally closed contact of the contactor is connected in series with the blind plate valve stop indication lamp. The stop indication circuit is used to control the blind plate valve stop indication lamp to be turned on by opening the start button when the coil of the contactor is not powered on, so as to prompt that the blind plate valve is in a stop state.

[0051] For example, the stop indication circuit includes the normally closed contact KM3 of the contactor KM and the blind plate valve stop indication lamp HR. When the current blind plate valve is in the stop state, the blind plate valve stop indication lamp HR is on. For example, when the device stops running, the coil of the contactor KM loses power, the first normally open contact KM1 and the second normally open contact KM2 of the contactor KM are disconnected, the stop indication circuit is turned on, and the red blind plate valve stop indication lamp HR is on, prompting the operator that the current blind plate valve is not in operation and the device is in the stop state.

[0052] In some examples, the signal cable is installed in a combination of galvanized pipe and explosion-proof flexible pipe.

[0053] For example, the signal cable (20) serves as a signal connection between the butterfly valve control box (10) and the blind plate valve control box (30), and the purpose is to send the signal that the butterfly valve has been opened to the position to the circuit in the blind plate valve control box (30).

[0054] Due to the explosion-proof area, the signal cable (20) should be installed in a combination of galvanized pipe and explosion-proof flexible pipe. Specifically, when installing the signal cable (20), first cut and process the galvanized pipe according to the planned path, fix and connect it through the support, and do a good job of fire and water sealing treatment when crossing the wall or floor. In places such as device connection, vibration displacement, etc. that require flexibility, connect the explosion-proof flexible pipe and the galvanized pipe with an adapter pipe joint. Carefully check the signal cable (20), and put a protective mouth on the pipe end of the connected explosion-proof flexible pipe and galvanized pipe. With the help of the lead, the signal cable (20) is smoothly inserted into the connected explosion-proof flexible pipe and galvanized pipe. After completion, check the laying of the signal cable (20), the installation of the pipeline, and the explosion-proof performance of the explosion-proof flexible pipe, and test the electrical performance of the signal cable (20).

[0055] In some examples, the blind plate valve control box further includes a fuse connected in series with the loosening control circuit, for circuit protection when an abnormality occurs in the circuit in the system for preventing gas leakage at the pressurizing station.

[0056] For example, when a short circuit fault occurs in the circuit in the system, the current will instantaneously and sharply increase, far exceeding the normal operating current of the circuit. The fuse in the fuse FU will rapidly melt due to overheating, thereby cutting off the circuit and preventing excessive short circuit current from causing damage to other components in the circuit. For example, if the live wire and the zero wire are directly short-circuited due to aging of the line, insulation damage, etc. in the circuit of the butterfly valve control box (10) or the blind plate valve control box (30), the short circuit current will cause the fuse of the fuse FU to melt, thereby timely disconnecting the circuit and avoiding serious damage to the electrical components of the entire control system, thereby ensuring the safety of the device and the circuit.

[0057] In summary, the system for preventing gas leakage of the pressurizing station provided by the application can ensure that the blind plate valve can be operated only when the butterfly valve is completely closed. When the butterfly valve is in operation, the blind plate valve cannot be operated, thereby preventing gas leakage caused by misoperation of the blind plate valve and ensuring safe and stable production.

[0058] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0059] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

[0060] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0061] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A system for preventing pressurized station gas leaks, comprising: The butterfly valve control box, the signal cable and the blind plate valve control box, wherein: The butterfly valve control box includes a close-to-position relay circuit, a close-to-position indication circuit and a close-to-position extension relay circuit; the close-to-position indication circuit is connected in parallel to the close-to-position relay circuit, and the close-to-position extension relay circuit is connected in parallel to the close-to-position indication circuit; The butterfly valve control box is connected with the blind plate valve control box through the signal cable; The blind plate valve control box includes a loose control circuit, a running indication circuit and a stop indication circuit; the running indication circuit is connected in parallel to the loose control circuit, and the stop indication circuit is connected in parallel to the running indication circuit. The close-to-position relay circuit includes a close-to-position contact of a butterfly valve head and a close-to-position relay, wherein the coil of the close-to-position relay is connected in series with the close-to-position contact, and the close-to-position relay circuit is used to energize the coil of the close-to-position relay when the close-to-position contact is closed.

2. The system for preventing pressurized station gas leakage according to claim 1, characterized in that, The close-to-position indication circuit includes a normally open contact of the close-to-position relay and a butterfly valve close-to-position indication lamp, wherein the normally open contact of the close-to-position relay is connected in series with the butterfly valve close-to-position indication lamp, and the close-to-position indication circuit is used to close the normally open contact of the close-to-position relay and light up the butterfly valve close-to-position indication lamp when the coil of the close-to-position relay is energized, so as to prompt that the butterfly valve has been completely closed.

3. The system for preventing pressurized station gas leakage according to claim 2, wherein The close-to-position extension relay circuit includes a coil of a close-to-position collection relay, and the coil of the close-to-position collection relay is connected in parallel to the butterfly valve close-to-position indication lamp, and the close-to-position extension relay circuit is used to energize the coil of the close-to-position collection relay when the butterfly valve close-to-position indication lamp is lighted up.

4. The system for preventing pressurized station gas leakage according to claim 3, wherein The loose control circuit includes a normally closed control switch, a start button, a normally open contact of a close-to-position collection relay, a coil of a contactor, a first normally open contact of the contactor and a normally closed contact of a thermal relay, wherein the control switch, the start button, the normally open contact of the close-to-position collection relay, the coil of the contactor and the normally closed contact of the thermal relay are connected in series, and the loose control circuit is used to close the normally open contact of the close-to-position collection relay when the coil of the close-to-position collection relay is energized, so as to energize the coil of the contactor by opening the start button; 5. The system for preventing pressurized station gas leakage according to claim 4, wherein The first normally open contact of the contactor is connected in parallel to the start button, the start button is electrically connected with the blind plate valve, and the loose control circuit is used to close the first normally open contact of the contactor when the coil of the contactor is energized, so as to control the blind plate valve to perform a loose operation by closing the start button. The butterfly valve control box sends an energization signal of the close-to-position collection relay to the normally open contact of the close-to-position collection relay in the blind plate valve control box through the signal cable, so as to close the normally open contact of the close-to-position collection relay.

6. The system for preventing pressurized station gas leakage according to claim 5, wherein ​ 7. The system for preventing pressurized station gas leaks of claim 5, wherein, The operation indication circuit comprises a second normally open contact of the contactor and a blind plate valve operation indication lamp, wherein the second normally open contact of the contactor is connected in series with the blind plate valve operation indication lamp, and the operation indication circuit is used for closing the second normally open contact of the contactor when the coil of the contactor is powered, and controlling the blind plate valve operation indication lamp to be turned on by turning off the start button, so as to prompt that the blind plate valve is in an operation state.

8. The system for preventing pressurized station gas leaks of claim 5, wherein, The stop indication circuit comprises a normally closed contact of the contactor and a blind plate valve stop indication lamp, wherein the normally closed contact of the contactor is connected in series with the blind plate valve stop indication lamp, and the stop indication circuit is used for controlling the blind plate valve stop indication lamp to be turned on by turning on the start button when the coil of the contactor is not powered, so as to prompt that the blind plate valve is in a stop state.

9. The system for preventing pressurized station gas leaks of claim 1, wherein, The signal cable is installed in a mode of combining a galvanized pipe with an anti-explosion flexible pipe.

10. The system for preventing pressurized station gas leaks of claim 1, wherein, The blind plate valve control box further comprises a fuse connected in series with the loosening control circuit, which is used for circuit protection when an abnormality occurs in the circuit in the system for preventing the gas leakage of the pressurizing station.

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