Gas supply control device

Abstract

The utility model provides a kind of gas supply control device, including gas supply gas path, electromagnetic valve in gas supply gas path, locking valve located in the downstream of electromagnetic valve, the measuring module for collecting pressure signal and control signal, the main control module for judging whether gas supply control device appears failure, and the control module for controlling the opening and closing state of electromagnetic valve, main control module can control electromagnetic valve in power-off state when gas supply control device appears failure, locking valve can cut off the gas path to terminal executor when gas supply control device appears failure, and then make terminal executor keep own position.The utility model's gas supply control device is integrated by high degree of modular design, realizes integrated intelligent emergency treatment to power failure, gas failure and signal failure, makes terminal executor lock in failure instantaneous position, prevents the safety accident caused by valve out of control, improves the reliability of gas supply system, reduces the maintenance cost of gas supply system.

Description

Technical Field

[0001] This utility model belongs to the field of fluid control technology, specifically relating to a gas supply control device. Background Technology

[0002] In the industrial sector, reliable control of the gas supply system is a core element in ensuring the safe and stable operation of the system. Traditional gas supply control devices typically employ relay logic or basic electronic circuits, resulting in relatively simple functions and significant limitations when facing complex industrial environments. Especially in the event of sudden abnormal conditions, such as unexpected power outages, sudden drops in driving gas pressure, or loss of control signals, traditional solutions often lack effective safety protection mechanisms. This can easily lead to valves in the gas supply system being in abnormally open or closed states, potentially causing production interruptions, equipment damage, or even safety accidents.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a gas supply control device that solves the problem of the lack of an effective safety protection mechanism in existing gas supply systems.

[0005] To achieve the above objectives, a specific embodiment of this utility model provides a gas supply control device. The gas supply control device includes a gas supply path for connecting a gas supply source and a terminal actuator, a solenoid valve disposed in the gas supply path, a lock-up valve disposed in the gas supply path and located downstream of the solenoid valve, a measurement module for acquiring pressure signals from the gas supply path and control signals from an external controller, a main control module for determining whether the gas supply control device has malfunctioned based on the pressure signals and control signals, and a control module for controlling the opening and closing state of the solenoid valve based on control commands from the main control module. The main control module can control the solenoid valve to be de-energized when the gas supply control device malfunctions, and the lock-up valve can cut off the gas path to the terminal actuator when the gas supply control device malfunctions, thereby keeping the terminal actuator in the working position.

[0006] In one or more embodiments of this utility model, the measuring module includes a pressure detection element disposed in the gas supply path and located upstream of the solenoid valve. The pressure detection element is used to collect the gas path pressure upstream of the solenoid valve and convert the collected gas path pressure into a pressure signal transmitted to the main control module.

[0007] In one or more embodiments of this utility model, the main control module is configured to issue a control command to the control module to de-energize the solenoid valve when the duration of continuous receipt of the low-pressure signal is greater than or equal to a preset delay time.

[0008] In one or more embodiments of this utility model, the gas supply control device further includes a DIP switch electrically connected to the input terminal of the main control module, the DIP switch being used to set a preset delay time.

[0009] In one or more embodiments of this utility model, the measurement module includes a signal amplification circuit and an analog-to-digital converter. The signal amplification circuit is used to receive and condition the control signal, and the analog-to-digital converter is used to convert the conditioned control signal into a digital signal and transmit it to the main control module.

[0010] In one or more embodiments of this utility model, the control module includes a first optocoupler, and the control module controls the on / off state of the solenoid valve through the first optocoupler.

[0011] In one or more embodiments of this utility model, the gas supply control device further includes a warning module, the warning module including a second optocoupler, and the main control module is configured to drive the second optocoupler of the warning module to conduct when the gas supply control device malfunctions, so as to output an alarm electrical signal to an external controller.

[0012] In one or more embodiments of this utility model, the gas supply control device further includes a valve block, the gas supply path is formed inside the valve block, and the pressure detection element, solenoid valve and lock-up valve used by the measurement module for collecting gas path pressure are installed on the same outer surface of the valve block.

[0013] In one or more embodiments of this utility model, the gas supply control device further includes a PCB board located on the side of the solenoid valve and the lock valve away from the valve block. The PCB board is fixedly connected to the valve block by a support strip. The signal amplification circuit and analog-to-digital converter for acquiring control signals, the main control module and the control module are integrated on the PCB board.

[0014] In one or more embodiments of this utility model, the gas supply control device further includes a protective shell disposed on the outer surface of the valve block, and the pressure detection element, solenoid valve, lock-up valve and PCB board are located inside the protective shell.

[0015] Compared with existing technologies, the gas supply control device of this utility model achieves integrated intelligent emergency handling for power failure, gas failure, and signal failure through a highly integrated modular design. It integrates three independent protection mechanisms into a single device, which can quickly and reliably cut off the gas path when any failure occurs, lock the terminal actuator at the instant of the failure, eliminate safety accidents caused by valve malfunction, significantly improve the overall reliability of the gas supply system, and reduce the maintenance cost of the gas supply system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective structural diagram of the gas supply control device in one embodiment of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the gas supply control device without a protective shell in one embodiment of the present invention;

[0019] Figure 3 This is an exploded structural diagram of the gas supply control device in one embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the internal air supply path of the valve block in one embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the gas supply circuit and various modules in one embodiment of the present invention.

[0022] Key reference numerals: 1. Valve block; 101. Air supply path; 102. Mounting slot; 2. Solenoid valve; 3. Locking valve; 4. Measurement module; 41. Pressure detection element; 5. Main control module; 6. Control module; 7. Warning module; 8. External controller; 9. PCB board; 10. Protective housing; 11. Gland; 12. Air supply source; 13. Terminal actuator. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0024] In the description of this utility model, it should be understood that the terms "top", "bottom", "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the term "first" is used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In one embodiment, reference is made to Figures 1 to 5 As shown, this utility model provides a gas supply control device. The gas supply control device adopts an integrated design. Through highly integrated functional modules, it realizes emergency handling of faults such as power failure, gas failure, and signal failure during the gas supply process. It ensures that the terminal actuator 13 can still maintain its current position when the gas supply control device fails, thus avoiding safety accidents caused by the failure of the terminal actuator 13.

[0027] Specifically, the gas supply control device includes a gas supply path 101, a solenoid valve 2, a lock-up valve 3, a measurement module 4, a main control module 5, and a control module 6. The output of the measurement module 4 is electrically connected to the input of the main control module 5, and the input of the control module 6 is electrically connected to the output of the main control module 5. The upstream end of the gas supply path 101 is connected to the gas supply source 12, and the downstream end of the gas supply path 101 is connected to the terminal actuator 13. In the on-state, the gas medium stored in the gas supply source 12 is delivered to the terminal actuator 13, keeping the terminal actuator 13 in the working position. The solenoid valve 2 is located on the gas supply path 101. When energized, the solenoid valve 2 is in the open state, allowing the upstream and downstream ends of the gas supply path 101 to be connected, enabling the gas supply source 12 to smoothly supply gas to the terminal actuator 13. When the solenoid valve 2 is de-energized, it is in a closed state, and the upstream and downstream ends of the gas supply line 101 are not connected. Furthermore, the gas medium at the upstream end of the gas supply line 101 can be discharged to the external environment or a specific gas storage device. The lock-up valve 3 is located in the gas supply line 101 and downstream of the solenoid valve 2. The lock-up valve 3 is a normally closed valve, and its internal structure has an elastic reset structure that allows its valve core to return to its original position. When the gas supply line 101 is supplying gas normally, the pressure within the gas supply line 101 acts on the elastic reset structure, moving the valve core of the lock-up valve 3 to a position that allows it to open, thus connecting the upstream and downstream ends of the gas supply line 101. The measurement module 4 is used to collect the pressure signal of the gas supply circuit 101 and the control signal sent by the external controller 8 (e.g., PLC) to the gas supply control device. It then sends the collected pressure and control signals to the main control module 5. Upon receiving the pressure and control signals, the main control module 5 can determine whether the gas supply control device is malfunctioning and identify the type of malfunction based on the pressure and control signals and its built-in control program. Whether the main control module 5 confirms that the gas supply control device is functioning correctly or malfunctioning, it can issue a control command to the control module 6. The control module 6 then controls the opening and closing state of the solenoid valve 2 based on this control command.

[0028] When the gas supply control device malfunctions, the main control module 5 sends a corresponding control command to the control module 6. The control module 6 then de-energizes the solenoid valve 2, cutting off the gas supply path 101. The gas medium upstream of the solenoid valve 2 can be discharged to the external environment or a specific gas storage device. Furthermore, the upstream end of the locking valve 3 loses its pressure, and the elastic reset structure within the locking valve 3 automatically resets, switching the locking valve 3 to a closed state. This cuts off the gas path downstream of the locking valve 3 and connects it to the terminal actuator 13, ensuring that the gas pressure in the downstream gas path remains relatively stable. This allows the terminal actuator 13 to maintain its position, preventing safety accidents caused by the malfunction of the gas supply control device.

[0029] It should be noted that the pressure signal collected by the measurement module 4 can reflect the air pressure in the air supply circuit 101. When the air pressure in the air supply circuit 101 is less than the preset air pressure threshold, it can be considered that the air pressure in the air supply circuit 101 is abnormal, and it is preliminarily determined that the air supply control device has a gas loss fault.

[0030] The control signal collected by the measurement module 4 is generally an analog current signal. When the current of the analog current signal is less than the preset current threshold, it can be considered that the control signal is abnormal, and it is initially determined that the gas supply control device has a signal loss fault.

[0031] In the event of a power failure, since the solenoid valve 2 is de-energized after a power failure, the gas medium upstream of the lock valve 3 is automatically discharged to the external environment or a specific gas storage device. The elastic reset structure of the lock valve 3 loses the force provided by the upstream gas medium and automatically resets, cutting off the gas path downstream to the terminal actuator 13. Therefore, there is no need to use the measurement module 4 to collect the corresponding signal that reflects whether the gas supply control device has experienced a power failure. The protection mechanism formed by the solenoid valve 2 and the lock valve 3 can automatically cut off the gas path to the terminal actuator 13 when the gas supply control device experiences a power failure, so that the terminal actuator 13 can remain in the working position.

[0032] In one embodiment, the measurement module 4 includes a pressure detection element 41, which can be a common pressure sensor such as a pressure switch. The pressure detection element 41 is located in the air supply path 101 and upstream of the solenoid valve 2. The pressure detection element 41 is mainly used to collect the air pressure upstream of the solenoid valve 2, convert the collected air pressure into a pressure signal, and send the pressure signal to the main control module 5. After receiving the pressure signal, the main control module 5 determines the magnitude of the air pressure based on the voltage of the pressure signal. Generally speaking, the voltage of the pressure signal is positively correlated with the air pressure. Therefore, a preset voltage threshold and a preset air pressure threshold corresponding to the preset voltage threshold can be set. When the voltage of the pressure signal is less than the preset voltage threshold, it can be considered that the air pressure is less than the preset air pressure threshold. The main control module 5 can then determine that the pressure of the air supply path 101 is abnormal, and thus preliminarily determine that the air supply control device has experienced an air shortage fault.

[0033] Furthermore, considering that the pressure state of the gas supply path 101 of the gas supply control device is not absolutely stable during normal gas supply in actual working scenarios, it may be affected by various complex factors, resulting in a certain degree of pressure fluctuation. Such fluctuations may be due to changes in instantaneous flow demand caused by the periodic or sudden actions of the terminal actuator 13, interference from the start-up and shutdown of other equipment in the gas path, or changes in fluid resistance during long-distance transportation. When the above disturbances occur, the gas path pressure may drop below the preset gas path pressure threshold in a short period of time. If the judgment logic of the main control module 5 is to immediately determine that the gas supply control device has experienced a gas shortage fault once the pressure signal is detected to be below the threshold, then normal pressure fluctuations will inevitably be misjudged as system faults. This misjudgment will trigger subsequent unnecessary protection actions, causing the solenoid valve 2 to unexpectedly lose power.

[0034] Therefore, to reduce the probability of misjudgment by the main control module 5 due to normal air pressure fluctuations, a preset delay time can be set. When the main control module 5 continuously receives a low-pressure signal indicating that the pressure is below the safety threshold, it does not immediately make a fault judgment, but simultaneously starts an internal timer to accurately measure the duration of the low-pressure signal. Only when the low-pressure signal persists for a time greater than or equal to the preset delay time, it indicates that the gas supply circuit 101 has been in a low-pressure state for a relatively long period of time, and the probability of the gas supply control device experiencing a gas shortage fault is very high, while the probability of air pressure fluctuation is very low. At this time, the main control module 5 can relatively accurately determine that the gas supply control device has experienced a gas shortage fault. The main control module 5 can send a control command to the control module 6 to de-energize the solenoid valve 2. The gas medium upstream of the solenoid valve 2 can be discharged to the external environment or a specific gas storage device. The lock valve 3 automatically switches to the closed state, cutting off the gas path downstream of it and leading to the terminal actuator 13, so that the terminal actuator 13 can remain in the working position. Conversely, if the main control module 5 receives the low pressure signal for a period of time less than the preset delay time, it indicates that the gas supply circuit 101 is in a low pressure state for a short period of time. The probability of the gas supply control device experiencing a gas drop fault is very small, while the probability of gas pressure fluctuation is very large. In this case, the main control module 5 should not determine that the gas supply control device has experienced a gas drop fault.

[0035] Furthermore, considering the significant differences in pressure fluctuations in the gas supply path 101 across various working scenarios—for example, in workshops where pneumatic equipment frequently starts and stops, the pressure drops instantaneously many times but for short durations; while in scenarios with long gas supply distances or complex pipelines, pressure recovery may be slow, resulting in prolonged periods of low pressure—this difference directly leads to different time windows during pressure fluctuations when the gas supply path pressure remains at a low level. If the gas supply control device adopts a uniform, fixed preset delay time across various working scenarios, the main control module 5 may become sluggish in scenarios with frequent fluctuations due to excessively long delays, and in scenarios with prolonged fluctuations, it may misjudge due to excessively short delays. Therefore, the reliability and adaptability of its protection logic are limited. Although a preset delay time can be pre-set for the expected working scenario of the gas supply control device before it leaves the factory, this method lacks flexibility. Once the gas supply control device is moved or the working condition changes, the original preset delay time will no longer be applicable, and the probability of misjudgment by the main control module 5 will increase significantly. It is extremely inconvenient to return the main control module 5 to the factory or connect a special tool to modify the preset delay time.

[0036] Therefore, to improve the adaptability of the gas supply control device to different operating conditions and simplify on-site debugging, a DIP switch is integrated into the gas supply control device. This DIP switch is electrically connected to multiple general-purpose input / output pins of the main control module 5, forming a hardware configuration interface. Each bit of the DIP switch represents a binary bit, and the combination of multiple switch bits forms a unique binary code. During the power-on initialization phase, the main control module 5 reads this binary code by detecting the level of the relevant pins. The main control module 5 internally stores a lookup table or has a fixed mapping algorithm to convert this binary code into a specific delay time value. On-site maintenance personnel can directly set the preset delay time by moving the DIP switch to the corresponding position according to the actual gas source stability and referring to the code-time correspondence table. This design greatly simplifies the process of adjusting the preset delay time. Adjusting the preset delay time requires no software tools, no disassembly of the gas supply control device, and no interruption of the gas supply control device's operation, greatly improving the applicability, maintainability, and on-site debugging efficiency of the gas supply control device.

[0037] In one embodiment, the measurement module 4 integrates a high-precision signal acquisition chain for acquiring control signals emitted by the external controller 8. The core of this acquisition chain consists of a signal amplification circuit and an analog-to-digital converter. Typically, the control signals emitted by the external controller 8 are standard 4-20mA analog current signals. The signal acquisition chain of the measurement module 4 first converts the input 4-20mA current signal into a weak voltage signal linearly proportional to it using a precision sampling resistor. This weak voltage signal is then transmitted to the signal amplification circuit for conditioning. The signal amplification circuit is typically built based on a high-performance operational amplifier. Its core function is to proportionally amplify (e.g., amplify by 1000 times) and perform impedance transformation on the received voltage signal, boosting it to an ideal level suitable for subsequent circuit processing. Simultaneously, it suppresses high-frequency noise and common-mode interference introduced by the circuit, ensuring the signal-to-noise ratio and stability of the signal.

[0038] The amplified and conditioned analog voltage signal is transmitted to the input channel of the analog-to-digital converter (ADC). The ADC discretizes and digitally encodes the continuous analog voltage signal, capturing the instantaneous value of the input voltage at a fixed sampling period. Based on an internal reference voltage, and through successive approximation or other conversion principles, it converts the voltage value corresponding to each sampling point into a fixed-width digital code, achieving precise quantitative conversion from the analog domain to the digital domain. After the analog voltage signal is converted into a digital signal, the core of the main control module 5 reads the digital signal and stores it in a register.

[0039] The built-in program in the main control module 5 can accurately calculate the current magnitude of the original control signal by reading and analyzing the received digital codes in real time, thereby continuously obtaining the specific content of the external control commands. When the current of the control signal is less than the preset current threshold (e.g., 4mA), the main control module 5 can identify that the current of the control signal is below the effective range, and thus accurately determine that the gas supply control device has experienced a signal loss fault.

[0040] In one embodiment, the control module 6 includes a first optocoupler. The input terminal of the first optocoupler (typically the anode of an internal light-emitting diode) is connected to the input / output port of the main control module 5 through a current-limiting resistor. The cathode of the input circuit of the first optocoupler is grounded. The output circuit of the first optocoupler is independently powered. Its collector is connected to the drive power supply (typically a 24V DC power supply isolated from the main control logic power supply), and its emitter is directly connected to one end of the coil of the solenoid valve 2. The other end of the coil of the solenoid valve 2 is connected to the drive power supply.

[0041] When the gas supply control device is working normally, the main control module 5 outputs a high-level signal to the first optocoupler, which turns on the light-emitting diode on the input side of the first optocoupler and makes it emit light. The light signal passes through the internal isolation barrier and triggers the photosensitive device (such as a phototransistor or a photosensitive Darlington tube) on the output side to turn on, thereby closing its output circuit, so that the coil of the solenoid valve 2 is energized, the solenoid valve 2 moves to the designated position, and the gas path upstream and downstream of the solenoid valve 2 is connected, so that the gas supply source 12 can supply gas to the terminal actuator 13 normally.

[0042] When the main control module 5 determines that the gas supply control device has malfunctioned and needs to de-energize the solenoid valve 2, the main control module 5 outputs a low-level signal to the first optocoupler, and both the input and output sides of the first optocoupler are turned off, thus de-energizing the coil of the solenoid valve 2.

[0043] This design achieves electrical isolation between the main control module 5 and the solenoid valve 2 drive circuit through the first optocoupler. It can effectively block strong electromagnetic interference such as the reverse electromotive force generated by the coil of solenoid valve 2 at the moment of switching on and off from entering the circuit of the main control module 5, thereby improving the anti-interference capability and stability of the gas supply control device in complex electromagnetic environments.

[0044] In one embodiment, the gas supply control device further includes a warning module 7. The core function of the warning module 7 is to generate an alarm electrical signal when a malfunction occurs in the gas supply control device and transmit the alarm electrical signal to the external controller 8. For this purpose, the warning module 7 integrates a second optocoupler. The input terminal of the second optocoupler (usually the anode of its internal light-emitting diode) is electrically connected to the main control module 5 through an appropriate current-limiting resistor, and the cathode of the input circuit of the second optocoupler is grounded.

[0045] When the main control module 5 determines that the gas supply control device has malfunctioned, it outputs a drive signal (e.g., a high level) to the second optocoupler. This drive signal turns on the LED on the input side of the second optocoupler, causing it to emit a light signal. This light signal passes through the internal electrical isolation barrier of the device, triggering the photosensitive semiconductor device (e.g., a phototransistor) on its output side to enter the conduction state. On the output side of the second optocoupler, the collector of the photosensitive device is connected to the positive terminal of an alarm power supply (usually 24V DC), while its emitter serves as the output terminal of the alarm signal, connected to the alarm output terminal on the housing of the gas supply control device for connecting to an external controller 8 (e.g., a PLC). When the photosensitive device of the second optocoupler is turned on, a complete current loop is formed between the alarm power supply, the second optocoupler, and the external controller 8, thereby generating a continuous alarm electrical signal. Upon receiving the alarm electrical signal, the external controller 8 can determine that the gas supply control device is in a faulty state. At the same time, after receiving the alarm signal, the main control module 5 simultaneously illuminates the LED status light of the gas supply control device, ensuring that the fault information can be captured by the remote monitoring system and quickly detected by on-site maintenance personnel.

[0046] In one embodiment, reference is made to Figures 1 to 4 As shown, the gas supply control device adopts a highly integrated structural design. The gas supply control device also includes a valve block 1, which is made of metal material (such as aluminum alloy). The gas supply passage 101 is formed inside the valve block 1 through processes such as drilling, milling and sealing with plugs.

[0047] To achieve modular assembly and maintenance of the gas supply control device, the pressure sensing element 41, solenoid valve 2, and lock-up valve 3 used to collect gas pressure in the measurement module 4 are all directly mounted on the same outer surface of the valve block 1. These components are sealed to the corresponding gas ports inside the valve block 1 via their respective threaded or quick-connect interfaces. This design reduces the risk of gas leakage due to loose joints or aging pipelines, improving the overall airtightness and reliability of the gas supply control device. Furthermore, all gas interfaces are easily standardized and have fixed positions, facilitating assembly, debugging, and subsequent component replacement. Secondly, the compact physical structure saves installation space, allowing the gas supply control device to adapt to work scenarios with limited installation space.

[0048] Furthermore, referring to Figure 2 and Figure 3As shown, the gas supply control device also includes a PCB board 9, which is located on the side of the solenoid valve 2 and the lock-up valve 3 away from the valve block 1. The PCB board 9 is fixedly connected to the valve block 1 by several support bars. One end of the support bar is fastened to a pre-set threaded hole on the surface of the valve block 1 with a screw, and the other end is fixedly connected to the PCB board 9 with a bolt, thereby fixing the relative position of the valve block 1 and the PCB board 9 and forming an installation space between them that can accommodate components such as the solenoid valve 2 and the lock-up valve 3. In this design layout, the measurement module 4, which is used for signal amplification circuits and analog-to-digital converters to acquire external control signals, the main control module 5, and the control module 6 are all highly integrated on the PCB board 9 in the form of electronic components and circuit traces.

[0049] Furthermore, referring to Figure 1 As shown, the gas supply control device also includes a protective shell 10 disposed on the outer surface of the valve block 1, which is fixedly connected to the valve block 1 by bolts. The protective shell 10 has a relatively sealed protective cavity, in which the pressure detection element 41, solenoid valve 2, lock-up valve 3, and PCB board 9 are all housed. The protective shell 10 serves to prevent dust, water, and impact, and to a certain extent shield electromagnetic interference, ensuring that the core components of the gas supply control device can operate stably for a long time in complex working environments.

[0050] Furthermore, referring to Figure 2 and Figure 3 As shown, in order to further improve the sealing performance of the protective shell 10, an installation groove 102 can be opened on the surface of the valve block 1 facing the protective shell 10. Sealing structures such as sealing rings are installed in the installation groove 102. The side of the protective shell 10 facing the valve block 1 can be inserted into the installation groove 102 to achieve a sealed connection between the valve block 1 and the protective shell 10.

[0051] Furthermore, referring to Figure 1 As shown, the protective housing 10 is provided with several glands 11, which are used to bring in and out power lines, signal lines and alarm lines.

[0052] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A gas supply control device, characterized in that, The gas supply control device includes a gas supply path (101) for connecting the gas supply source (12) and the terminal actuator (13), a solenoid valve (2) located in the gas supply path (101), a lock-up valve (3) located in the gas supply path (101) and downstream of the solenoid valve (2), a measurement module (4) for collecting the pressure signal of the gas supply path (101) and the control signal of the external controller (8), a main control module (5) for determining whether the gas supply control device has malfunctioned based on the pressure signal and the control signal, and a control module (6) for controlling the opening and closing state of the solenoid valve (2) based on the control command of the main control module (5). The main control module (5) can control the solenoid valve (2) to be in a de-energized state when the gas supply control device malfunctions. The lock-up valve (3) can cut off the gas path to the terminal actuator (13) when the gas supply control device malfunctions, thereby keeping the terminal actuator (13) in the working position.

2. The gas supply control device according to claim 1, characterized in that, The measurement module (4) includes a pressure detection element (41) located in the gas supply line (101) and upstream of the solenoid valve (2). The pressure detection element (41) is used to collect the gas pressure upstream of the solenoid valve (2) and convert the collected gas pressure into a pressure signal that is transmitted to the main control module (5).

3. The gas supply control device according to claim 2, characterized in that, The main control module (5) is configured to send a control command to the control module (6) to de-energize the solenoid valve (2) when the time for which the low-pressure signal is continuously received is greater than or equal to a preset delay time.

4. The gas supply control device according to claim 3, characterized in that, The gas supply control device also includes a DIP switch electrically connected to the input terminal of the main control module (5), which is used to set a preset delay time.

5. The gas supply control device according to claim 1, characterized in that, The measurement module (4) includes a signal amplification circuit and an analog-to-digital converter. The signal amplification circuit is used to receive and condition the control signal, and the analog-to-digital converter is used to convert the conditioned control signal into a digital signal and transmit it to the main control module (5).

6. The gas supply control device according to claim 1, characterized in that, The control module (6) includes a first optocoupler, and the control module (6) controls the on / off state of the solenoid valve (2) through the first optocoupler.

7. The gas supply control device according to claim 1, characterized in that, The gas supply control device also includes a warning module (7), which includes a second optocoupler. The main control module (5) is configured to drive the second optocoupler of the warning module (7) to conduct when the gas supply control device malfunctions, so as to output an alarm electrical signal to the external controller (8).

8. The gas supply control device according to claim 1, characterized in that, The gas supply control device also includes a valve block (1), the gas supply path (101) is formed inside the valve block (1), and the pressure detection element (41), solenoid valve (2) and lock valve (3) used by the measurement module (4) to collect the pressure of the gas path are installed on the same outer surface of the valve block (1).

9. The gas supply control device according to claim 8, characterized in that, The gas supply control device also includes a PCB board (9) located on the side of the solenoid valve (2) and the lock valve (3) away from the valve block (1). The PCB board (9) is fixedly connected to the valve block (1) by a support bar. The measurement module (4) is used to collect control signals. The signal amplification circuit and analog-to-digital converter, the main control module (5) and the control module (6) are integrated on the PCB board (9).

10. The gas supply control device according to claim 9, characterized in that, The gas supply control device also includes a protective shell (10) on the outer surface of the valve block (1), and the pressure detection element (41), solenoid valve (2), lock valve (3) and PCB board (9) are located inside the protective shell (10).

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