Diaphragm compressor diaphragm stress sudden change protection system

Abstract

The utility model provides a diaphragm compressor diaphragm stress sudden change protection system which comprises a filling main pipe, a plurality of filling branch pipes communicated with the filling main pipe and a control module, the head end of the filling main pipe is communicated with an exhaust valve outlet of a diaphragm compressor, and an exhaust pressure transmitter and a flow regulating valve are arranged in the filling main pipe. The tail end of each filling branch pipe is communicated with an air storage tank with the corresponding pressure grade, and a stop valve and a filling pressure transmitter are arranged in each filling branch pipe. And the control module is used for correspondingly controlling the opening degree of the flow regulating valve according to the pressure values of the exhaust pressure transmitter and the filling pressure transmitter. According to the diaphragm compressor diaphragm stress sudden change protection system provided by the invention, the condition of rupture caused by diaphragm stress sudden change can be avoided, and the effect of protecting the diaphragm is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of diaphragm compressors, and in particular to a diaphragm compressor diaphragm stress mutation protection system. Background Art

[0002] A diaphragm compressor consists of a cylinder, a chamber within the cylinder, and a diaphragm that divides the chamber into an air chamber and an oil chamber. During operation, hydraulic oil drives the diaphragm in reciprocating motion, compressing the gas in the air chamber. Due to the diaphragm's separating effect, the hydraulic oil in the oil chamber does not enter the air chamber, resulting in a high-purity gas. Therefore, diaphragm compressors are widely used, for example, in the hydrogen filling process.

[0003] When filling hydrogen, the diaphragm compressor is connected to multiple hydrogen storage tanks with different pressure levels. After one hydrogen storage tank is filled, it switches to another hydrogen storage tank for filling until all hydrogen storage tanks are fully filled. However, when switching between hydrogen storage tanks with different pressure levels, the pressure of the air cavity connected to the hydrogen storage tank will suddenly change, resulting in a sudden change in the pressure difference on both sides of the diaphragm, which in turn causes a sudden stress change at the point where the diaphragm contacts the exhaust port, which can easily lead to diaphragm rupture. Diaphragm rupture will cause the hydraulic oil in the oil cavity to enter the air cavity, causing the hydrogen in the air cavity to be contaminated and causing huge losses. Therefore, there is an urgent need for a device that can protect the diaphragm and prevent it from rupturing due to sudden stress changes to solve the above problems.

[0004] The information disclosed in this background technology section is only used to deepen the understanding of the background technology of the present disclosure and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] In view of the above problems, a diaphragm stress mutation protection system for a diaphragm compressor is provided, which can avoid the diaphragm from rupture due to stress mutation and play a role in protecting the diaphragm.

[0006] Specifically, the present application provides a diaphragm stress mutation protection system for a diaphragm compressor, comprising a filling main pipe, multiple filling branches connected to the filling main pipe, and a control module, the head end of the filling main pipe being connected to the exhaust valve outlet of the diaphragm compressor, and the filling main pipe being provided with an exhaust pressure transmitter and a flow regulating valve; the ends of each of the filling branches are respectively connected to an air storage tank of a corresponding pressure level, and each of the filling branches is respectively provided with a shut-off valve and a filling pressure transmitter; the control module is used to control the opening of the flow regulating valve according to the pressure values of the exhaust pressure transmitter and the filling pressure transmitter.

[0007] Optionally, the diaphragm stress sudden change protection system for the diaphragm compressor further includes a leakage pressure transmitter, which is used to detect the leakage pressure of the gas and / or hydraulic oil on both sides of the diaphragm of the diaphragm compressor.

[0008] Optionally, the diaphragm includes an intermediate diaphragm, an air side diaphragm and an oil side diaphragm located on both sides of the intermediate diaphragm; the leakage pressure transmitter is connected to the pressure relief groove of the intermediate diaphragm through a pressure-leading pipeline, and the leakage pressure transmitter is connected to the pressure-leading pipeline through a ferrule.

[0009] Optionally, the multiple filling branches include high-pressure filling branches, medium-pressure filling branches and low-pressure filling branches; the end of the high-pressure filling branch is connected to a high-pressure gas storage tank, the end of the medium-pressure filling branch is connected to a medium-pressure gas storage tank, and the end of the low-pressure filling branch is connected to a low-pressure gas storage tank; the high-pressure filling branch is correspondingly provided with a high-pressure shut-off valve and a high-pressure filling pressure transmitter, the medium-pressure filling branch is correspondingly provided with a medium-pressure shut-off valve and a medium-pressure filling pressure transmitter, and the low-pressure filling branch is correspondingly provided with a low-pressure shut-off valve and a low-pressure filling pressure transmitter.

[0010] Optionally, the flow regulating valve is a pneumatic flow regulating valve or an electric flow regulating valve, and the shut-off valve is a pneumatic shut-off valve or an electric shut-off valve.

[0011] The diaphragm compressor diaphragm stress mutation protection system of the present application is provided with a flow control valve, an exhaust pressure transmitter and a filling pressure transmitter. By analyzing the pressure values detected by the exhaust pressure transmitter and the filling pressure transmitter, the opening of the flow control valve is adjusted accordingly to make the pressure change smoothly, thereby avoiding the sudden change in diaphragm stress caused by the pressure mutation, avoiding the risk of diaphragm rupture, and playing a role in protecting the diaphragm.

[0012] Based on the detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the diaphragm stress mutation protection system of the diaphragm compressor in an embodiment of the present application.

[0014] Figure 2 This is a schematic structural diagram of the diaphragm compressor in an embodiment of the present application.

[0015] Figure 3 This is a logic control flow chart of the diaphragm stress mutation protection system of the diaphragm compressor in an embodiment of the present application.

[0016] Figure 4 This is a schematic structural diagram of the PLC control system in an embodiment of the present application.

[0017] In the above figures, 100 is the diaphragm stress mutation protection system of the diaphragm compressor, 111 is the filling main pipe, 112 is the high-pressure filling branch pipe, 113 is the medium-pressure filling branch pipe, 114 is the low-pressure filling branch pipe, 121 is the leakage pressure transmitter, 122 is the exhaust pressure transmitter, 123 is the high-pressure filling pressure transmitter, 124 is the medium-pressure filling pressure transmitter, 125 is the low-pressure filling pressure transmitter, 126 is the flow control valve, 127 is the high-pressure filling pressure transmitter, Shut-off valve, 128 is the medium-pressure shut-off valve, 129 is the low-pressure shut-off valve, 200 is the diaphragm compressor, 211 is the cylinder block, 212 is the cylinder head, 213 is the diaphragm, 214 is the air chamber, 215 is the oil chamber, 216 is the oil hole, 217 is the intake valve, 218 is the exhaust valve, 221 is the crankshaft, 222 is the connecting rod, 223 is the piston, 231 is the crankcase, 310 is the high-pressure gas tank, 320 is the medium-pressure gas tank, and 330 is the low-pressure gas tank. DETAILED DESCRIPTION

[0018] In the description of this application, it should be understood that the terms "upper," "lower," "front," "back," "left," "right," "top," "bottom," "inside," "outside," "vertical," "horizontal," "clockwise," "counterclockwise," and the like, indicating positions or locations, are based on the positions or locations shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Unless otherwise specified, the terms "connection" and "coupling" referred to in this application include both direct and indirect connections (couplings).

[0019] Figure 1 This is a schematic structural diagram of the diaphragm stress sudden change protection system of the diaphragm compressor in the embodiment of the present application, as shown in FIG. Figure 1 As shown, and reference Figure 2 The embodiment of the present application provides a diaphragm stress sudden change protection system 100 for a diaphragm compressor, comprising a filling main pipe 111, a plurality of filling branches connected to the filling main pipe 111, and a control module. The head end of the filling main pipe 111 is connected to the outlet of the exhaust valve 218 of the diaphragm compressor 200, and the filling main pipe 111 is provided with an exhaust pressure transmitter 122 and a flow control valve 126. The end of each filling branch pipe is connected to a gas storage tank of a corresponding pressure level, and each filling branch pipe is provided with a shut-off valve and a filling pressure transmitter. The control module is used to control the opening of the flow control valve 126 according to the pressure values of the exhaust pressure transmitter 122 and the filling pressure transmitter.

[0020] In the diaphragm compressor diaphragm stress sudden change protection system 100 of the present embodiment, the head end of the filling main pipe 111 is first connected to the outlet of the exhaust valve 218 of the diaphragm compressor 200. The ends of the multiple filling branch pipes are then connected to air tanks of corresponding pressure levels. During operation, after one air tank is filled, it automatically switches to the next air tank and fills it. The exhaust pressure transmitter 122 monitors the exhaust pressure in real time, and the filling pressure transmitter monitors the filling pressure in real time. The control module analyzes and determines the exhaust and filling pressures to control the opening of the flow control valve 126.

[0021] The diaphragm compressor diaphragm stress mutation protection system 100 of the present application is provided with a flow regulating valve 126, an exhaust pressure transmitter 122 and a filling pressure transmitter. By analyzing the pressure values detected by the exhaust pressure transmitter 122 and the filling pressure transmitter, the opening of the flow regulating valve 126 is automatically adjusted to make the pressure change smoothly, thereby avoiding the risk of sudden stress change of the diaphragm 213 caused by the pressure mutation, leading to the rupture of the diaphragm 213, and playing a role in protecting the diaphragm 213.

[0022] In some embodiments of the present application, Figure 2 As shown, the diaphragm compressor 200 includes a working chamber part, a transmission part and a body part. The working chamber part includes a cylinder body 211, a cylinder head 212, a diaphragm 213, an air chamber 214, an oil chamber 215, an oil hole 216, an intake valve 217 and an exhaust valve 218. The transmission part includes a crankshaft 221, a connecting rod 222 and a piston 223. The body part includes a crankcase 231, a base and various pipelines. When the diaphragm compressor 200 is working, the crankshaft 221 rotates, driving the connecting rod 222 to move, and then driving the piston 223 to move up and down. When the piston 223 moves downward, the hydraulic oil in the oil chamber 215 flows out through the oil hole 216, and the diaphragm 213 moves downward. The external pressure is greater than the pressure in the air chamber 214, and the external gas pushes open the intake valve 217 and enters the air chamber 214. When the piston 223 moves upward, the hydraulic oil enters the oil chamber 215 through the oil hole 216, and the diaphragm 213 moves upward, causing the pressure in the air chamber 214 to increase, and the gas in the air chamber 214 is compressed. The compressed gas pushes open the exhaust valve 218 and is discharged.

[0023] In some embodiments of the present application, Figure 1As shown, the diaphragm stress sudden change protection system 100 for a diaphragm compressor includes a leakage pressure transmitter 121. The leakage pressure transmitter 121 is used to detect the leakage pressure of gas and / or hydraulic oil on both sides of the diaphragm 213 of the diaphragm compressor 200 and to diagnose its own open circuit or short circuit. The leakage pressure transmitter 121 is connected to the control module and can transmit leakage signals to the control module. The control module controls the alarm device to sound an alarm and / or controls the diaphragm compressor 200 to shut down and / or controls the flow control valve 126 to close, thereby preventing the mixing of hydraulic oil and gas and causing gas contamination, and also ensuring the safe operation of the diaphragm compressor 200. For example, in this system, the normal pressure is set to 0.1 MPa. When the leakage pressure detected by the leakage pressure transmitter 121 is greater than 0.1 MPa and persists for 3 seconds, the control module can determine that a gas and / or hydraulic oil leak has occurred, and then issue an alarm, shut down the machine, close the valve, and perform timely maintenance.

[0024] In this embodiment, when the diaphragm 213 ruptures, the gas and hydraulic oil on both sides of the diaphragm 213 will leak. By setting a leakage pressure transmitter 121, the leakage pressure of the gas and / or hydraulic oil on both sides of the diaphragm 213 can be monitored in real time, thereby ensuring that the rupture of the diaphragm 213 is discovered in time.

[0025] Compared to traditional pressure switches, the pressure transmitter used in this embodiment can output real-time pressure within its range. Compared to pressure switches that can only determine whether the monitored pressure exceeds the limit, the pressure transmitter's continuous analog output can provide more effective and reliable information for determining the status of the membrane head. The control module of this embodiment uses a PLC, which acquires and determines data from the leakage pressure transmitter 121. The digital value collected by the PLC corresponding to the 4-20mA analog signal of the leakage pressure transmitter is 5530-27648. The operating status of the leakage pressure transmitter 121 is determined by the corresponding digital value collected by the PLC: if the digital value collected by the PLC is 0, it indicates that the leakage pressure transmitter 121 is open; if the digital value collected by the PLC is greater than 27648, it indicates that the leakage pressure transmitter 121 is short-circuited. Therefore, the leakage pressure transmitter 121 can achieve self-diagnosis, achieving the purpose of detecting its own open circuit, short circuit, or other problems, and preventing its own operating status from affecting monitoring accuracy.

[0026] In some embodiments of the present application, the diaphragm 213 includes an intermediate diaphragm, and gas-side and oil-side diaphragms located on either side of the intermediate diaphragm. The leakage pressure transmitter 121 is connected to the pressure relief groove of the intermediate diaphragm via a pressure-inducing pipeline, and the leakage pressure transmitter 121 and the pressure-inducing pipeline are connected via a ferrule.

[0027] In this embodiment, when the air side diaphragm and / or the oil side diaphragm is damaged, the gas on the air side diaphragm side and the hydraulic oil on the oil side diaphragm side will leak into the intermediate diaphragm between the air side diaphragm and the oil side diaphragm. During the compression stroke of the diaphragm compressor 200, the gas or hydraulic oil will be pressed out from the pressure relief groove of the intermediate diaphragm and then transmitted to the leakage pressure transmitter 121 through the pressure pipeline, thereby generating a detected pressure signal.

[0028] In some embodiments of the present application, the control module is further configured to determine a fault condition of the exhaust valve 218 based on gas fluctuations detected by the exhaust pressure transmitter 122 .

[0029] Since the exhaust valve 218 is a vulnerable part, it has a certain failure rate, which may affect the working efficiency and reliability of the diaphragm compressor 200. In this embodiment, since the exhaust pressure transmitter 122 is installed at the outlet of the exhaust valve 218 of the diaphragm compressor 200, the fault status of the exhaust valve 218 can be determined by pressure fluctuations, which can quickly locate the fault of the exhaust valve 218, greatly saving maintenance troubleshooting time and greatly improving maintenance efficiency. Specifically, the exhaust pressure transmitter 122 monitors the working status of the exhaust valve 218 in real time. The control module records the maximum and minimum values of the exhaust pressure transmitter 122 per unit time based on the exhaust pressure data detected by the exhaust pressure transmitter 122, and calculates the difference between the maximum and minimum values as the exhaust pressure fluctuation value. The median of the pressure fluctuation value of the exhaust valve 218 during normal exhaust and the pressure fluctuation value when the reverse seal cannot be achieved, calculated based on the previous test operation data, is used as the set value. The control module then determines whether the exhaust pressure fluctuation value during actual operation is greater than the set value. In this embodiment, to eliminate errors, a set exhaust pressure fluctuation value is set to exceed this set value four times in a row. The control module then determines that exhaust valve 218 is unable to reverse seal and is faulty, and outputs an alarm interlock shutdown signal from the corresponding port of the control module. If the control module determines that the fluctuation value of exhaust pressure transmitter 122 is less than a set value four times in a row (the set value is the median of the exhaust pressure fluctuation values calculated based on prior test operation data, which are the values when the hydraulic oil system fails and the values when the hydraulic oil system is normal), the control module determines that the hydraulic oil system of diaphragm compressor 200 is faulty, making gas compression impossible, and outputs a fault alarm interlock shutdown signal from the corresponding port of the control module.

[0030] In some embodiments of the present application, Figure 1As shown, the multiple filling branches include a high-pressure filling branch 112, a medium-pressure filling branch 113, and a low-pressure filling branch 114. The end of the high-pressure filling branch 112 is connected to the high-pressure gas storage tank 310, the end of the medium-pressure filling branch 113 is connected to the medium-pressure gas storage tank 320, and the end of the low-pressure filling branch 114 is connected to the low-pressure gas storage tank 330. The pressure of the high-pressure gas storage tank 310 is 45 MPa, the pressure of the medium-pressure gas storage tank 320 is 35 MPa, and the pressure of the low-pressure gas storage tank 330 is 25 MPa.

[0031] In some embodiments of the present application, Figure 1 As shown, the high-pressure filling branch pipe 112 is provided with a high-pressure shut-off valve 127 and a high-pressure filling pressure transmitter 123, the medium-pressure filling branch pipe 113 is provided with a medium-pressure shut-off valve 128 and a medium-pressure filling pressure transmitter 124, and the low-pressure filling branch pipe 114 is provided with a low-pressure shut-off valve 129 and a low-pressure filling pressure transmitter 125.

[0032] In some embodiments of the present application, the flow regulating valve 126 is a pneumatic flow regulating valve, and the shut-off valve is a pneumatic shut-off valve. Since both the flow regulating valve 126 and the shut-off valve are pneumatically controlled, the flow regulating valve 126 and the shut-off valve have advantages such as small size, good sealing, sensitive adjustment, and rapid operation, which can meet the usage requirements of the system.

[0033] In some embodiments of the present application, the flow regulating valve 126 is an electric flow regulating valve, and the shut-off valve is an electric shut-off valve. Since both the flow regulating valve 126 and the shut-off valve are electrically controlled, the flow regulating valve 126 and the shut-off valve have advantages such as simple structure, rapid switching, high flow capacity, and zero leakage, which can meet the use requirements of the system.

[0034] In some embodiments of the present application, Figure 4 As shown, the control module adopts a programmable logic controller (PLC), including a central processing unit (CPU), an analog input module (AI), an analog output module (AO) and a power supply. The central processing unit (CPU) is connected to the high-pressure cut-off valve (SV01), the medium-pressure cut-off valve (SV02) and the low-pressure cut-off valve (SV03). The analog input module (AI) is used to input leakage pressure (PT01), exhaust pressure (PT02), high-pressure charging pressure (PT03), medium-pressure charging pressure (PT04) and low-pressure charging pressure (PT05). The analog output module (AO) is connected to the flow control valve (FV01).

[0035] The present application also provides a control method for a diaphragm compressor diaphragm stress sudden change protection system 100, such as Figure 3 As shown, the following steps are included.

[0036] In step S1, the diaphragm compressor diaphragm stress sudden change protection system 100 detects the operating signal of the diaphragm compressor 200 and performs real-time diaphragm 213 rupture detection. If the leakage pressure PT01 exceeds 0.1 MPa and persists for 3 seconds, the system triggers an alarm and interlocks the diaphragm compressor 200 for an emergency shutdown to prevent hydraulic oil from entering the air storage tank.

[0037] In step S2, after the diaphragm compressor 200 is running, the system first opens the high-pressure shut-off valve (SV01) 127 and starts to inflate the high-pressure gas storage tank 310; when the high-pressure charging pressure PT03 is less than the exhaust pressure PT02, the flow regulating valve (FV01) 126 controls the pressure rise rate of the high-pressure charging pressure PT03 to 0.5 MPa / s, that is, when the pressure rise rate is greater than 0.5 MPa / s, the opening of the flow regulating valve (FV01) 126 is reduced, and when the pressure rise rate is less than 0.5 MPa / s, the opening of the flow regulating valve (FV01) 126 is increased to prevent the diaphragm 213 from being damaged due to sudden pressure changes; when the high-pressure charging pressure PT03 is greater than or equal to the exhaust pressure PT02, the flow regulating valve (FV01) 126 is fully opened to restore the normal high-pressure charging state.

[0038] In step S3, when the high-pressure inflation pressure PT03 is greater than the high-pressure inflation pressure setting value, the high-pressure inflation is completed, and the system opens the medium-pressure shut-off valve (SV02) 128 for medium-pressure inflation, and closes the high-pressure shut-off valve (SV01) 127 at the same time; when the medium-pressure inflation pressure PT04 is less than the exhaust pressure PT02, the flow control valve (FV01) 126 controls the pressure rise rate of the medium-pressure inflation pressure PT04 to 0.5 MPa / s, that is, when the pressure rise rate is greater than 0.5 MPa / s, the opening of the flow control valve (FV01) 126 is reduced, and when the pressure rise rate is less than 0.5 MPa / s, the opening of the flow control valve (FV01) 126 is increased to prevent the diaphragm 213 from being damaged by a sudden pressure change; when the medium-pressure inflation pressure PT04 is greater than or equal to the exhaust pressure PT02, the flow control valve (FV01) 126 is fully opened to restore the normal medium-pressure inflation state.

[0039] In step S4, when the medium-pressure inflation pressure PT04 is greater than the medium-pressure inflation pressure setting value, the medium-pressure inflation is completed, and the system opens the low-pressure cut-off valve (SV03) 129 for low-pressure inflation, and closes the medium-pressure cut-off valve (SV02) 128 at the same time; when the low-pressure inflation pressure PT05 is less than the exhaust pressure PT02, the flow control valve (FV01) 126 controls the pressure rise rate of the low-pressure inflation pressure PT05 to 0.5 MPa / s, that is, when the pressure rise rate is greater than 0.5 MPa / s, the opening of the flow control valve (FV01) 126 is reduced, and when the pressure rise rate is less than 0.5 MPa / s, the opening of the flow control valve (FV01) 126 is increased to prevent the diaphragm 213 from being damaged due to sudden pressure changes; when the low-pressure inflation pressure PT05 is greater than or equal to the exhaust pressure PT02, the flow control valve (FV01) 126 is fully opened to restore the normal low-pressure inflation state.

[0040] Step S5, when the low-pressure inflation pressure PT05> the low-pressure inflation pressure set value, the low-pressure inflation is completed, the system closes the low-pressure cut-off valve (SV03) 129, and the interlocked diaphragm compressor 200 automatically shuts down.

[0041] Although some preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0042] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of the inventive concept. Thus, if such changes and modifications fall within the scope of the claims of this application and their equivalents, this application is intended to include such changes and modifications.

Claims

1. A diaphragm compressor diaphragm stress sudden change protection system, characterized in that: It includes a filling main pipe, multiple filling branches connected to the filling main pipe and a control module. The head end of the filling main pipe is connected to the exhaust valve outlet of the diaphragm compressor, and the filling main pipe is provided with an exhaust pressure transmitter and a flow regulating valve; the end of each of the filling branches is respectively connected to an air storage tank of corresponding pressure level, and each of the filling branch pipes is respectively provided with a shut-off valve and a filling pressure transmitter; the control module is used to control the opening of the flow regulating valve according to the pressure values of the exhaust pressure transmitter and the filling pressure transmitter.

2. The diaphragm compressor diaphragm stress sudden change protection system according to claim 1 is characterized in that: It also includes a leakage pressure transmitter, which is used to detect the leakage pressure of gas and / or hydraulic oil on both sides of the diaphragm of the diaphragm compressor.

3. The diaphragm compressor diaphragm stress sudden change protection system according to claim 2, characterized in that: The diaphragm includes an intermediate diaphragm, an air side diaphragm and an oil side diaphragm located on both sides of the intermediate diaphragm; the leakage pressure transmitter is connected to the pressure relief groove of the intermediate diaphragm through a pressure-leading pipeline, and the leakage pressure transmitter and the pressure-leading pipeline are connected through a ferrule.

4. The diaphragm compressor diaphragm stress sudden change protection system according to claim 1, characterized in that: The multiple filling branch pipes include a high-pressure filling branch pipe, a medium-pressure filling branch pipe and a low-pressure filling branch pipe; the end of the high-pressure filling branch pipe is connected to a high-pressure gas storage tank, the end of the medium-pressure filling branch pipe is connected to a medium-pressure gas storage tank, and the end of the low-pressure filling branch pipe is connected to a low-pressure gas storage tank; The high-pressure filling branch pipe is correspondingly provided with a high-pressure shut-off valve and a high-pressure filling pressure transmitter, the medium-pressure filling branch pipe is correspondingly provided with a medium-pressure shut-off valve and a medium-pressure filling pressure transmitter, and the low-pressure filling branch pipe is correspondingly provided with a low-pressure shut-off valve and a low-pressure filling pressure transmitter.

5. The diaphragm compressor diaphragm stress sudden change protection system according to claim 1, characterized in that: The flow regulating valve is a pneumatic flow regulating valve or an electric flow regulating valve, and the shut-off valve is a pneumatic shut-off valve or an electric shut-off valve.

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