A double valve micro-discharge device for diaphragm compressor

Abstract

The present invention relates to a double-valve micro-discharge device for a diaphragm compressor, comprising a diaphragm compressor, wherein the diaphragm compressor is provided with a diaphragm head leakage interface, and the diaphragm compressor is also provided with an air disc leakage interface, wherein the air disc leakage interface is connected to an air disc pressure gauge, and the air disc leakage interface is also connected to a first metering valve, and the first metering valve is connected to a first discharge port through the first low-pressure check valve; the air disc leakage interface is also connected to an inlet of a second low-pressure check valve, and the outlet of the second low-pressure check valve is connected to a pressure transmitter, and the outlet of the second low-pressure check valve is also connected to a second metering valve, and the second metering valve is connected to the first discharge port through the first low-pressure check valve. The beneficial effects of the present invention are as follows: the air disc leakage interface and the air disc pressure gauge are provided, and the leakage of the air disc sealing ring can be effectively distinguished from the leakage of the diaphragm and the oil side sealing ring, thereby eliminating the false alarm caused by occasional micro-leakage of the air disc sealing ring and the impact of the shutdown on production, and significantly extending the maintenance cycle of the diaphragm head.

Description

Technical Field

[0001] The invention relates to diaphragm compressor equipment, in particular to a double-valve micro-discharge device for a diaphragm compressor. Background Art

[0002] Due to the promotion of clean fuel, many hydrogen refueling stations currently use diaphragm compressors for hydrogen refueling. The existing diaphragm compressor diaphragm head leakage detection system generally uses a combination of pressure transmitter, check valve and hand valve (such as Figure 1 As shown). When the gas disk seal ring, the oil disk seal ring or any of the oil and gas side diaphragms are damaged, the pressurized gas or pressurized hydraulic oil will leak and be collected to the leakage interface of the diaphragm head through the leakage collection groove. The leakage fault is detected by the pressure sensor, and an alarm or emergency shutdown is issued in time. The defect of the prior art is that when the diaphragm compressor runs for a long time, the high-temperature and high-pressure gas (especially small molecular gas, such as hydrogen) in the diaphragm head can easily penetrate the gas disk seal ring, causing micro-gas leakage, causing the pressure instrument of the leak detection to alarm and stop. When the diaphragm head of the compressor was disassembled for inspection, it was found that there was no obvious damage to the diaphragm and the seal ring, but the shutdown for maintenance caused a large amount of production loss, and the removal of the diaphragm head caused a large amount of man-hour loss. Summary of the invention

[0003] The purpose of the present invention is to provide a double-valve micro-discharge device for a diaphragm compressor to avoid the influence of false alarms and shutdown caused by occasional micro-leakage on production.

[0004] In order to achieve the above-mentioned object, the technical solution of the present invention is: a diaphragm compressor double valve micro-discharge device, comprising a diaphragm compressor (10), the diaphragm compressor is provided with a diaphragm head leakage interface (11), the diaphragm compressor is also provided with an air disk leakage interface (12), the air disk leakage interface is connected to an air disk pressure gauge (21), the air disk leakage interface is also connected to a first metering valve (41), the first metering valve is connected to a first discharge port (51) through the first low-pressure check valve (31); the air disk leakage interface is also connected to an inlet of a second low-pressure check valve (32), the outlet of the second low-pressure check valve is connected to a pressure transmitter (22), the outlet of the second low-pressure check valve is also connected to a second metering valve (42), and the second metering valve (42) is connected to the first discharge port (51) through the first low-pressure check valve (31).

[0005] Furthermore, in order to discharge a large amount of leaked gas, the outlet of the second low-pressure check valve (32) is also connected to a high-pressure exhaust valve (33), and the high-pressure exhaust valve (33) is connected to the second exhaust port (52).

[0006] Furthermore, in order to detect leakage of the diaphragm or the oil pan seal, the diaphragm head leakage interface (12) is connected to the pressure transmitter (22), and the diaphragm head leakage interface is also connected to a high-pressure exhaust valve (33), and the high-pressure exhaust valve is connected to the second exhaust port (52).

[0007] Furthermore, in order to effectively control and discharge micro-leakage of the gas disc sealing ring, the first low-pressure check valve (31) and the second low-pressure check valve (32) are check valves that open when the pressure is greater than 0.1 barg.

[0008] Furthermore, in order to achieve control of micro-leakage of the gas disc seal ring and distinguish and judge leakage of the gas disc side seal ring or leakage of the diaphragm and oil disc side seal ring, the first metering valve (41) and the second metering valve (42) are flow regulating valves.

[0009] Furthermore, in order to realize leakage detection of the disc side sealing ring, the gas disc leakage interface (11) is an interface connected to the gas disc side diaphragm.

[0010] Furthermore, in order to effectively control the discharge pressure, the high-pressure exhaust valve (33) is a check valve that opens when the pressure is greater than 6.9 barg.

[0011] Furthermore, in order to ensure the safe operation of the diaphragm compressor, the pressure transmitter (22) is connected to a safety controller (24) via a data line (23), and the safety controller (24) is a controller that sends out an alarm signal and controls the diaphragm compressor to shut down.

[0012] The beneficial effects of the present invention are as follows: an air disk leakage interface and an air disk pressure gauge are provided, which can effectively distinguish the leakage of the air disk sealing ring from the leakage of the diaphragm and the oil side sealing ring, eliminate the false alarm caused by occasional micro-leakage of the air disk sealing ring and the impact of shutdown on production, and significantly extend the maintenance cycle of the membrane head.

[0013] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of an existing diaphragm compressor diaphragm head leakage detection device;

[0015] Figure 2 is a structural diagram of the diaphragm compressor of the present invention;

[0016] Figure 3 yes Figure 2 A partial enlarged view is a diagram showing the sealing structure and the detection interface structure of the present invention;

[0017] Figure 4 It is a structural diagram of the double-valve micro-discharge device of the present invention;

[0018] Figure 5 This is a schematic diagram of the operation of the gas disc sealing ring of the present invention when occasional micro-leakage occurs;

[0019] Figure 6 It is a schematic diagram of the operation of the gas disk sealing ring of the present invention when a large amount of leakage occurs;

[0020] Figure 7 This is a schematic diagram of the operation of the diaphragm or oil pan seal ring of the present invention when a small amount of leakage occurs;

[0021] Figure 8 It is a schematic diagram of the operation of the diaphragm or the oil pan seal ring of the present invention when a large amount of leakage occurs. DETAILED DESCRIPTION

[0022] like Figure 1 The existing diaphragm compressor's diaphragm head leakage detection system includes a diaphragm head leakage interface 11, a high-pressure exhaust valve 33, a pressure transmitter 22 and a safety controller 24. When any of the gas disk seal ring 13, the oil disk seal ring 14 or the oil and gas side diaphragm 15 is damaged, the pressurized gas or pressurized hydraulic oil will leak and be collected to the diaphragm head leakage interface 11 through the leakage collection groove 16. The leakage fault is detected by the pressure sensor 22, and an alarm or emergency shutdown is performed in time. The defect of the prior art is that when the compressor runs for a long time, the high-temperature and high-pressure gas (especially small molecular gas, such as hydrogen) in the diaphragm head can easily pass through the gas disk seal ring 13 to produce micro-leakage of gas, causing the pressure instrument for leakage detection to alarm and stop.

[0023] In order to solve the above technical problems, the present invention adopts a technical solution of a double-valve micro-discharge device for a diaphragm compressor.

[0024] Embodiment 1:

[0025] like Figures 2 to 4 A diaphragm compressor double valve micro-discharge device includes a diaphragm compressor 10, the diaphragm compressor is provided with an oil pan 17, an air pan 18 and a piston 19, a diaphragm 15 is arranged between the oil pan and the air pan, and the piston pushes the diaphragm on the oil pan side to generate oil pressure. An air pan sealing ring 13 is arranged between the diaphragm 15 and the air pan 18, an oil pan sealing ring 14 is arranged between the diaphragm 15 and the oil pan 17, and a leakage convergence groove 16 is arranged between the oil pan and the air pan, and the leakage convergence groove 16 is connected to the membrane head leakage interface 11.

[0026] An air disc leakage interface 12 is provided on the air disc side, and the air disc leakage interface 12 is an interface connected to the air disc side diaphragm. An isolation seal ring 1a is provided between the air disc 18 and the diaphragm 15, and the air disc is provided with an isolation detection hole 1b connected to the air disc leakage interface 12. The air disc is provided with an isolation groove 1c between the isolation seal ring 1a and the air disc seal ring 13, and the isolation detection hole 1b is connected to the isolation groove 1c. The isolation detection hole 1b connects the air disc leakage interface (11) to the air disc side diaphragm.

[0027] The gas disc leakage interface 12 is connected to the gas disc pressure gauge 21 through the first three-way connection 53, and the gas disc leakage interface is also connected to the first metering valve 41 through the first three-way connection 53 and the first four-way connection 54. The first metering valve is connected to the first low-pressure check valve 31 through the third three-way connection 57, and the first low-pressure check valve 31 is connected to the first discharge port 51.

[0028] The gas disk leakage interface 12 is also connected to the inlet of the second low-pressure check valve 32, and the outlet of the second low-pressure check valve is connected to the pressure transmitter 22 through the second four-way valve 55 and the second three-way valve 56. The outlet of the second low-pressure check valve is also connected to the second metering valve 42 through the second four-way valve 55 and the second three-way valve 56. The second metering valve 42 is also connected to the first discharge port 51 through the third three-way valve 57 and the first low-pressure check valve 31.

[0029] The outlet of the second low-pressure check valve 32 is also connected to the high-pressure exhaust valve 33 through the second four-way valve 55 , and the high-pressure exhaust valve 33 is connected to the second exhaust port 52 , providing a discharge channel for the gas disk leakage interface 12 .

[0030] The membrane head leakage interface 11 is connected to the pressure transmitter 22 through the second four-way 55 and the second three-way 56 . The membrane head leakage interface 11 is also connected to the high-pressure exhaust valve 33 through the second four-way 55 , providing a discharge channel for the membrane head leakage interface 11 .

[0031] The pressure transmitter 22 is connected to a safety controller 24 via a data line 23. The safety controller is a controller that sends out an alarm signal and controls the diaphragm compressor to shut down.

[0032] In this embodiment, the gas disk pressure gauge 21 includes a pressure sensor that can output a gas pressure signal. The high-pressure exhaust valve 33 is a safety valve that opens when the pressure is greater than 6.9 barg. The first low-pressure check valve 31 and the second low-pressure check valve 32 are check valves that open when the pressure is greater than 0.1 barg. The first metering valve and the second metering valve are flow regulating valves. The first discharge port 51 and the second discharge port 52 are outlets that directly connect to the atmosphere.

[0033] This embodiment adopts two metering valves, a first metering valve 41 and a second metering valve 42. The first metering valve 41 and the second metering valve 42 are flow control valves that produce a damping effect on the airflow, so that the pressure transmitter 22 can detect the leakage of the air disk sealing ring and the leakage of the diaphragm and the oil side sealing ring, and can effectively distinguish the leakage of the air disk sealing ring from the leakage of the diaphragm and the oil side sealing ring.

[0034] like Figure 5 When the gas disc seal ring 13 occasionally leaks, the leaked gas is intercepted by the isolation seal ring 1a for a second time, and the leaked gas flows out of the gas disc leakage interface 12 through the isolation groove 1c, and then directly discharged into the atmosphere through the first metering valve 41 and the first low-pressure check valve 31 through the first discharge port 51. Since it is a trace leakage, the damping effect of the first metering valve 41 and the second metering valve 42 is small, and there will be a small range of pressure at the gas disc leakage interface 12, which is detected by the gas disc pressure gauge 21 and the pressure transmitter 22, and it can be judged that the diaphragm compressor is in normal operation.

[0035] When the leakage of the gas disc seal ring 13 increases, the flow through the first metering valve 41 increases. Due to the damping effect of the first metering valve 41, the pressure at the gas disc leakage interface 12 will increase significantly and be detected by the gas disc pressure gauge 21 and the pressure transmitter 22. When the pressure transmitter 22 detects that the pressure is 1 barG, an alarm signal is issued and the diaphragm compressor is controlled to shut down. According to engineering practice, when the pressure rises to 1 barG, it indicates that the gas disc seal ring 13 has been damaged and needs to be repaired.

[0036] like Figure 6 If a large amount of leakage occurs in the gas disk sealing ring 13, the first metering valve 41 has a large damping effect, which limits the discharge amount from the first metering valve 41 and the first low-pressure check valve 31 to the discharge port 51. The gas pressure will reach the pressure transmitter 22 through the second low-pressure check valve 32. The pressure detected by the gas disk pressure gauge 21 and the pressure transmitter 22 will continue to increase. When the pressure exceeds 6.9 barG, the high-pressure exhaust valve 33 will open and discharge the leaked medium gas through the second discharge port 52.

[0037] like Figure 7 When the diaphragm 15 or the oil pan seal 14 leaks, a small amount of gas can be discharged through the second metering valve 42 and the first low-pressure check valve 31. When a large amount of gas leaks, the pressure of the leaked gas will increase due to the damping effect of the second metering valve 42. When the pressure transmitter 22 detects that the pressure is 1 barG, an alarm signal is issued and the diaphragm compressor is controlled to shut down. Similarly, if Figure 8 If the pressure of the leaked gas continues to rise and exceeds 6.9 barG, the high-pressure exhaust valve 33 will open and discharge the leaked medium gas through the second exhaust port.

[0038] According to the above analysis of several working conditions, if the alarm value of the pressure transmitter 22 is set to 0.5 barg, when the pressure transmitter 22 generates an alarm signal, if the pressure alarm is caused by a large leakage of the gas disc seal 13, then the readings of the gas disc pressure gauge 21 and the pressure transmitter 22 should be greater than or equal to 0.5 barg. If the pressure alarm is caused by a large leakage of the diaphragm 15 or the oil pan seal 14, then the reading of the pressure transmitter 22 will be greater than or equal to 0.5 barg, and the reading of the gas disc pressure gauge 21 will be around 0.1 barg. Conversely, by observing the readings of the gas disc pressure gauge 21 and the pressure transmitter 22, it is possible to distinguish and judge whether it is a leak of the gas disc side seal or a leak of the diaphragm and the oil pan side seal.

[0039] The advantages of the present invention are: two metering valves, the first metering valve 41 and the second metering valve 42, are used to effectively distinguish the leakage of the gas disc side sealing ring from the leakage of the diaphragm and the oil disc side sealing ring. The influence of the false alarm caused by the occasional micro-leakage of the sealing device on the production caused by the shutdown is eliminated. The maintenance cycle of the membrane head can be greatly extended. Since the opening of the first metering valve and the second metering valve is adjustable, the allowable gas micro-leakage can be controlled according to different applications and working conditions.

Claims

1. A diaphragm compressor double valve micro-discharge device, comprising a diaphragm compressor (10), characterized in that: The diaphragm compressor is provided with a diaphragm head leakage interface (11), the diaphragm head leakage interface (11) is connected to a pressure transmitter (22), the diaphragm head leakage interface is also connected to a high-pressure exhaust valve (33), the diaphragm head leakage interface is also connected to a second metering valve (42), the second metering valve (42) is connected to a first discharge port (51) via a first low-pressure check valve (31), the diaphragm compressor is also provided with an air disk leakage interface (12), the air disk leakage interface is connected to an air disk pressure gauge (21), the air disk leakage interface is also connected to a first metering valve (41), the first metering valve is connected to the first discharge port (51) via the first low-pressure check valve (31); the air disk leakage interface is also connected to an inlet of the second low-pressure check valve (32), the outlet of the second low-pressure check valve (32) is also connected to a high-pressure exhaust valve (33), the high-pressure exhaust valve (33) is connected to the second discharge port (52), the outlet of the second low-pressure check valve is connected to the pressure transmitter (22); the pressure transmitter (22) is connected to a safety controller (24) via a data line (23); When the gas disc sealing ring (13) occasionally leaks, the leaked gas is discharged through the first discharge port (51) and detected by the gas disc pressure gauge (21) and the pressure transmitter (22), so that it can be determined that the diaphragm compressor is in a normal operating state; When the leakage of the gas disc seal ring (13) increases, the pressure at the gas disc leakage interface (12) will increase significantly and be detected by the gas disc pressure gauge (21) and the pressure transmitter (22). When the pressure transmitter (22) detects that the pressure is 1 barG, an alarm signal is issued and the diaphragm compressor is controlled to stop. When a large amount of leakage occurs from the gas disc sealing ring (13), the pressure detected by the gas disc pressure gauge (21) and the pressure transmitter (22) will continue to increase. When the pressure exceeds 6.9 barG, the high-pressure exhaust valve (33) will open and the leaked gas will be discharged through the second exhaust port (52); When a slight leak occurs in the diaphragm (15) or the oil pan sealing ring (14), the leaked medium is discharged through the first discharge port (51); When the diaphragm (15) or the oil pan seal (14) leaks in large quantities, the pressure of the leaked medium will increase. When the pressure transmitter (22) detects that the pressure is 1 barG, an alarm signal is issued and the diaphragm compressor is controlled to stop. When the pressure of the leaked medium continues to increase and exceeds 6.9 barG, the high-pressure exhaust valve (33) opens to discharge the leaked medium through the second discharge port.

2. A diaphragm compressor double valve micro-discharge device according to claim 1, characterized in that: The first low-pressure check valve (31) and the second low-pressure check valve (32) are check valves that open when the pressure is greater than 0.1 barG; the high-pressure exhaust valve (33) is a check valve that opens when the pressure is greater than 6.9 barG; and the first metering valve (41) and the second metering valve (42) are flow regulating valves.

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