Diaphragm compressor parallel cross control system

Abstract

The invention discloses a diaphragm compressor parallel cross control system, which relates to the technical field of diaphragm compressors and comprises a first air inlet pipeline, two second air inlet pipelines, two first exhaust pipelines and two second exhaust pipelines. Through cooperation of the first unit, the second unit, the third unit, the fourth unit, the second bridging pipeline and the second bridging valve, the number of control selection modes is increased from two to four, the linkage flexibility and the automation level of the system are greatly improved, operation is more flexible, the system adapts to variable working conditions, the production process is optimized, and the production efficiency is improved. Frequent starting caused by equipment faults is greatly reduced, and the service life of the equipment is prolonged; when a unit breaks down, the system can be switched to a standby unit in real time, the utilization rate of other units is increased, production loss and idling cost caused by shutdown are effectively reduced, the pressure of emergency maintenance is relieved, the quality and efficiency of maintenance work are improved, the comprehensive advantages are synergistic, the production efficiency is remarkably improved, and the production cost is reduced. And more economic benefits are brought to enterprises.

Description

Technical Field

[0001] The invention relates to the technical field of diaphragm compressors, in particular to a parallel crossover control system for diaphragm compressors. Background Art

[0002] Diaphragm compressors are often used to transport high-purity gases, precious rare gases, toxic and harmful gases, and corrosive gases. They are an important type of positive displacement compressor. When working, the traditional series diaphragm compressor unit has two operating modes according to the pressure of the air inlet buffer tank: when the pressure is high, only the second set of equipment is started; when the pressure is low, the first set of equipment is started and its operating speed is adjusted, and at the same time, it is decided whether to start the second set of equipment and adjust its speed according to the conditions.

[0003] However, although this traditional series unit configuration meets production needs to a certain extent, its inherent limitations are becoming increasingly prominent. First, due to the relatively large number of unit equipment, it not only increases the complexity and maintenance costs of the system, but also leads to an increase in the overall failure rate. Secondly, some equipment may face startup difficulties under certain working conditions, affecting the stability and reliability of the system. In addition, due to the relatively independent operation strategies between equipment and the lack of an effective linkage mechanism, the equipment utilization rate is generally low, resulting in a waste of resources.

[0004] Based on this, a diaphragm compressor parallel cross control system is now provided, which can eliminate the disadvantages of the existing system. Summary of the invention

[0005] The object of the present invention is to provide a diaphragm compressor parallel cross control system to solve the problems in the background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A parallel cross control system for diaphragm compressors comprises an intake pipeline 1, two intake pipelines 2, two exhaust pipelines 1 and two exhaust pipelines 2, the intake pipeline 1 is connected to the two intake pipelines 2, the two intake pipelines 2 are respectively connected to the intake ends of unit 1 and unit 3, the outlet end of unit 1 is connected to the intake end of unit 2 through an exhaust pipeline 1, the outlet end of unit 3 is connected to the intake end of unit 4 through another exhaust pipeline 1, the two exhaust pipelines 1 are connected through a jumper pipeline 2, a jumper valve 2 is installed on the jumper pipeline 2, the outlet ends of unit 2 and unit 4 are respectively connected to the two exhaust pipelines 2, the two exhaust pipelines 2 are connected through an exhaust connecting pipeline, one exhaust pipeline 2 is connected to an exhaust connecting pipeline, the exhaust connecting pipeline is connected to the intake end of a three-stage buffer tank, a three-stage cooler is arranged on the exhaust connecting pipeline, and the outlet end of the three-stage buffer tank is connected to an exhaust pipeline 3.

[0008] Preferably, the unit 1, unit 2, unit 3, unit 4 and jumper valve 2 are all connected to the PLC control circuit and are fully automatically controlled by the PLC control program.

[0009] Preferably, the structure of unit 1 and unit 3 is the same, the unit 1 includes a compressor body 1, the air inlet end of the compressor body 1 is connected to a connecting pipe 1, the air outlet end of the compressor body 1 is connected to an exhaust pipe 1, the connecting pipe 1 is connected to an exhaust pipe 1 through a jumper pipe 1, a jumper valve 1 is installed on the jumper pipe 1, the connecting pipe 1 is connected to the air outlet end of an air intake buffer tank, the air inlet end of the air intake buffer tank is connected to an air intake pipe 2, a PT instrument 1 and a PIA instrument 1 are provided on the air intake pipe 2, the jumper valve 1, the PT instrument 1 and the PIA instrument 1 are all connected to a PLC control circuit, the PLC control circuit is connected to control a variable frequency motor 1, and the variable frequency motor 1 is used to drive the internal piston of the compressor body 1 to operate.

[0010] Preferably, an interstage pipeline is provided between each stage of the air cavity of the compressor body, and a first-stage cooler and a first-stage buffer tank are installed on the interstage pipeline.

[0011] Preferably, the structure of unit two and unit four is the same, and the unit two includes a compressor body two, the air inlet end of the compressor body two is connected to the air inlet pipeline three, the air outlet end of the compressor body two is connected to the exhaust pipeline two, the air inlet pipeline three is connected to the air outlet end of the secondary buffer tank, the air inlet end of the secondary buffer tank is connected to the air outlet end of the secondary cooler through the connecting pipeline two, and a PT instrument two and a PIA instrument two are installed on the secondary buffer tank, and both the PT instrument two and the PIA instrument two are connected to the PLC control circuit, and the PLC control circuit is connected to control the variable frequency motor two, and the variable frequency motor two is used to drive the internal piston of the compressor body two to operate, and the air inlet end of the secondary cooler is connected to the exhaust pipeline one.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The present invention increases the control selection modes from two to four by coordinating unit one, unit two, unit three, unit four, jumper pipe two and jumper valve two, greatly improving the system linkage flexibility and automation level, which not only makes the operation more flexible to adapt to changing working conditions and optimizes the production process, but also greatly reduces the frequent startup caused by equipment failure and extends the life of the equipment; when a unit fails, the system can immediately switch to the standby unit, improve the utilization rate of the remaining units, effectively reduce the production loss and idle labor cost caused by downtime, and relieve the pressure of emergency maintenance, and improve the quality and efficiency of maintenance work. These comprehensive advantages work synergistically to significantly enhance production efficiency and bring more economic benefits to the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention.

[0015] Figure 2 It is a schematic diagram of the structure of unit one and unit three of the present invention.

[0016] Figure 3 It is a schematic diagram of the structure of unit 2 and unit 4 of the present invention.

[0017] Notes on the reference numerals: 1. Unit 1; 2. Unit 2; 3. Unit 3; 4. Unit 4; 11. Compressor body 1; 12. Intake buffer tank; 13. Connecting pipeline 1; 14. Jumper pipeline 1; 15. Jumper valve 1; 16. Frequency conversion motor 1; 17. PT instrument 1; 18. PIA instrument 1; 111. Interstage pipeline; 112. First stage cooler; 113. First stage buffer tank; 21. Compressor body 2; 22. Second stage Cooler; 23. Connecting pipeline 2; 24. Secondary buffer tank; 25. Intake pipeline 3; 26. Frequency conversion motor 2; 27. PT instrument 2; 28. PIA instrument 2; 51. Intake pipeline 1; 52. Intake pipeline 2; 53. Exhaust pipeline 1; 54. Exhaust pipeline 2; 55. Exhaust connecting pipeline; 56. Third-stage cooler; 57. Third-stage buffer tank; 58. Exhaust pipeline 3; 59. Jumper pipeline 2; 60. Jumper valve 2. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] In one embodiment, Figure 1-Figure 3 As shown, a diaphragm compressor parallel cross control system includes an intake pipeline 1 51, two intake pipelines 2 52, two exhaust pipelines 1 53 and two exhaust pipelines 2 54, the intake pipeline 1 51 is connected to the two intake pipelines 2 52, the two intake pipelines 2 52 are respectively connected to the intake ends of the unit 1 and the unit 3 3, the outlet end of the unit 1 is connected to the intake end of the unit 2 2 through an exhaust pipeline 1 53, the outlet end of the unit 3 3 is connected to the intake end of the unit 4 4 through another exhaust pipeline 1 53, and the two exhaust pipelines 1 53 are connected by a jumper pipe 2 59, and a jumper valve 2 60 is installed on the jumper pipe 2 59. The outlet ends of the unit 2 2 and the unit 4 4 are respectively connected to two exhaust pipes 2 54, and the two exhaust pipes 2 54 are connected by an exhaust connecting pipe 55. One of the exhaust pipes 2 54 is connected to the exhaust connecting pipe 55, and the exhaust connecting pipe 55 is connected to the air inlet end of the third-stage buffer tank 57. A third-stage cooler 56 is arranged on the exhaust connecting pipe 55, and the outlet end of the third-stage buffer tank 57 is connected to the exhaust pipe 3 58.

[0020] In this embodiment, the system adopts a parallel cross control method to achieve airflow balance and regulation between multiple compressor units. Through the design of the second jumper pipe 59 and the second jumper valve 60, the airflow distribution between each unit can be flexibly adjusted to improve the stability and efficiency of the system.

[0021] In an optional embodiment, the unit 1, unit 2, unit 3, unit 4, and jumper valve 2 60 are all connected to a PLC control circuit and are fully automatically controlled by a PLC control program.

[0022] It should be noted that the PLC can monitor the operating status of the system in real time, and according to the operating status of the system, the PLC can automatically adjust the opening of the jumper valve 2 60 to balance the airflow between the units and ensure stable operation of the system.

[0023] In an optional embodiment, the unit 1 and the unit three 3 have the same structure, the unit 1 includes a compressor body 11, the air inlet end of the compressor body 11 is connected to a connecting pipe 13, the air outlet end of the compressor body 11 is connected to an exhaust pipe 53, the connecting pipe 13 is connected to the exhaust pipe 53 through a jumper pipe 14, a jumper valve 15 is installed on the jumper pipe 14, the connecting pipe 13 is connected to the air outlet end of the air intake buffer tank 12, the air intake end of the air intake buffer tank 12 is connected to an air intake pipe two 52, a PT meter 17 and a PIA meter 18 are provided on the air intake pipe two 52, the jumper valve 15, the PT meter 17 and the PIA meter 18 are all connected to a PLC control circuit, the PLC control circuit is connected to control a variable frequency motor 16, and the variable frequency motor 16 is used to drive the internal piston of the compressor body 11 to operate.

[0024] It should be noted that when the gas enters the intake buffer tank 12 through the intake pipe 52, the PT meter 17 and the PIA meter 18 will monitor the pressure and flow of the gas in real time. These data are transmitted to the PLC control circuit, and the PLC determines whether it is necessary to start the compressor body 11 based on the preset logic and algorithm.

[0025] If the pressure is normal or high, the PLC will control the jumper valve 15 to open, allowing the gas to be discharged directly through the jumper pipe 14, bypassing the compressor.

[0026] If the pressure is low, the PLC will start the variable frequency motor 16 to drive the piston inside the compressor body 11 to run and start compressing the gas.

[0027] The compressed gas is discharged through the exhaust pipe 53 and enters the subsequent system or equipment.

[0028] In an optional embodiment, an interstage pipeline 111 is provided between the air cavities of each stage of the compressor body 11, and a primary cooler 112 and a primary buffer tank 113 are installed on the interstage pipeline 111.

[0029] It should be noted that when the gas is compressed and discharged from a certain level of the air cavity of the compressor body 11, it first enters the interstage pipeline 111. In the interstage pipeline 111, the gas is first cooled by the first-stage cooler 112. The cooled gas then enters the first-stage buffer tank 113, where the gas flow and pressure are stabilized. The stabilized gas then enters the next-level air cavity for further compression.

[0030] In an optional embodiment, the unit 2 2 and the unit 4 4 have the same structure, and the unit 2 2 includes a compressor body 21, the air inlet end of the compressor body 21 is connected to the air inlet pipeline 3 25, the air outlet end of the compressor body 21 is connected to the exhaust pipeline 2 54, the air inlet pipeline 3 25 is connected to the air outlet end of the secondary buffer tank 24, the air inlet end of the secondary buffer tank 24 is connected to the air outlet end of the secondary cooler 22 through the connecting pipeline 23, and a PT instrument 27 and a PIA instrument 28 are installed on the secondary buffer tank 24, and the PT instrument 27 and the PIA instrument 28 are both connected to the PLC control circuit, and the PLC control circuit is connected to control the variable frequency motor 26, and the variable frequency motor 26 is used to drive the internal piston of the compressor body 21 to operate, and the air inlet end of the secondary cooler 22 is connected to the exhaust pipeline 1 53.

[0031] It should be noted that the high-temperature gas discharged from the exhaust pipe 1 53 first enters the secondary cooler 22 for cooling, and the cooled gas enters the secondary buffer tank 24 through the connecting pipe 23 for buffering and stabilization. The stabilized gas enters the compressor body 2 21 through the intake pipe 3 25 for compression, and the compressed gas is discharged from the unit through the exhaust pipe 2 54 and enters the subsequent system or equipment.

[0032] The above-mentioned embodiment discloses a parallel cross control system for diaphragm compressors.

[0033] Working principle when the pressure is normal: When the PT instrument 17 and the PIA instrument 18 detect that the gas source pressure is in the normal range or higher, the PT instrument 17 and the PIA instrument 18 will transmit the signal to the PLC control circuit. At this time, the unit 1 in the series unit will not start, but remain in standby mode. At the same time, the jumper valve 15 will open to allow gas to pass directly; the high-pressure equipment of the unit 2 in the series unit will start and run separately, and the PT instrument 27 and the PIA instrument 28 will transmit the signal to the PLC control circuit. The PLC control circuit will automatically adjust the frequency conversion motor 26 to control the piston running speed according to the gas source pressure of the secondary buffer tank 24 to meet the final demand for the gas source pressure.

[0034] The control principle of another set of units including unit three 3 and unit four 4 is the same as the above, that is, the start-up and operation of the equipment are determined according to the pressure state of the air intake buffer tank 12.

[0035] Working principle when pressure is low: When the remaining gas source pressure of the air intake buffer tank 12 is lower than the air intake operating range of the series unit 2, the PT instrument 17 and the PIA instrument 18 will immediately detect this change and transmit the signal to the PLC control circuit. At this time, the PLC control circuit will control the variable frequency motor 26 of the unit 2 to reduce to a low speed of 30HZ and a maximum of 50HZ to reduce energy consumption and protect the equipment; the system will immediately put the unit 1 in the series unit into operation, and compare and calculate the remaining gas source pressure value in the air intake buffer tank 12 with the pressure value for starting the equipment. If the air intake demand range value condition is met, the PLC control circuit will start the unit 1 and adjust its piston running speed according to the pressure value.

[0036] When unit 1 is started, the system will continue to monitor the gas source pressure sensor value of the secondary buffer tank 24. If the value reaches the pressure value condition for starting the series unit 2, the piston running speed of the compressor body 2 will be adjusted to accelerate. At this time, the cross-connection valve 15 will be closed immediately to form a single set of series linkage control system.

[0037] If a device in unit 1 or unit 2 in the series unit fails and stops running, the system will not stop as a whole.

[0038] Instead, the jumper valve 2 60 will be opened immediately, and the corresponding equipment of another series unit will be connected and put into operation under the control of the PLC program logic operation.

[0039] For example, if unit 1 fails, the whole machine series control will be exited immediately, and unit 3 will be put into operation; if unit 2 fails, the whole machine series control will be exited immediately, and unit 4 will be put into operation.

[0040] The control principle of the other set of series units is the same, that is, when one of the devices fails, the other device will be switched to operation to ensure the normal operation of the unit.

[0041] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A diaphragm compressor parallel cross control system, characterized in that: The invention comprises an air intake pipeline 1 (51), two air intake pipelines 2 (52), two exhaust pipelines 1 (53) and two exhaust pipelines 2 (54), wherein the air intake pipeline 1 (51) is connected to the two air intake pipelines 2 (52), the two air intake pipelines 2 (52) are respectively connected to the air intake ends of the unit 1 (1) and the unit 3 (3), the air outlet end of the unit 1 (1) is connected to the air intake end of the unit 2 (2) through an exhaust pipeline 1 (53), the air outlet end of the unit 3 (3) is connected to the air intake end of the unit 4 (4) through another exhaust pipeline 1 (53), and the two exhaust pipelines 1 (53) are connected via a jumper pipe. The second exhaust pipe (59) is connected to the second exhaust pipe (59), and a second jumper valve (60) is installed on the second jumper pipe (59). The outlet ends of the second unit (2) and the fourth unit (4) are respectively connected to two exhaust pipes (54). The two exhaust pipes (54) are connected through an exhaust connecting pipe (55). One of the exhaust pipes (54) is connected to the exhaust connecting pipe (55). The exhaust connecting pipe (55) is connected to the air inlet end of the third buffer tank (57). A third cooler (56) is arranged on the exhaust connecting pipe (55). The outlet end of the third buffer tank (57) is connected to the exhaust pipe three (58).

2. A diaphragm compressor parallel cross control system according to claim 1, characterized in that: The unit 1 (1), unit 2 (2), unit 3 (3), unit 4 (4) and jumper valve 2 (60) are all connected to the PLC control circuit and are fully automatically controlled by the PLC control program.

3. A diaphragm compressor parallel cross control system according to claim 2, characterized in that: The unit 1 (1) and the unit 3 (3) have the same structure. The unit 1 (1) comprises a compressor body 1 (11). The air inlet end of the compressor body 1 (11) is connected to a connecting pipe 1 (13). The air outlet end of the compressor body 1 (11) is connected to an exhaust pipe 1 (53). The connecting pipe 1 (13) is connected to the exhaust pipe 1 (53) via a jumper pipe 1 (14). A jumper valve 1 (15) is installed on the jumper pipe 1 (14). The connecting pipe 1 (13) is connected to an air inlet buffer valve 1 (15). The air outlet end of the air intake buffer tank (12) is connected to the air intake end of the air intake pipeline (52), and the air intake pipeline (52) is provided with a PT meter (17) and a PIA meter (18). The jumper valve (15), the PT meter (17) and the PIA meter (18) are all connected to a PLC control circuit, and the PLC control circuit is connected to control a variable frequency motor (16), and the variable frequency motor (16) is used to drive the internal piston of the compressor body (11) to operate.

4. A diaphragm compressor parallel cross control system according to claim 3, characterized in that: An interstage pipeline (111) is provided between each stage of the air cavity of the compressor body (11), and a first-stage cooler (112) and a first-stage buffer tank (113) are installed on the interstage pipeline (111).

5. A diaphragm compressor parallel cross control system according to claim 2, characterized in that: The unit 2 (2) and the unit 4 (4) have the same structure. The unit 2 (2) comprises a compressor body 2 (21). The air inlet end of the compressor body 2 (21) is connected to an air inlet pipeline 3 (25). The air outlet end of the compressor body 2 (21) is connected to an exhaust pipeline 2 (54). The air inlet pipeline 3 (25) is connected to an outlet end of a secondary buffer tank (24). The air inlet end of the secondary buffer tank (24) is connected to a secondary cooler (22) via a connecting pipeline 2 (23). ) outlet end is connected, a PT meter 2 (27) and a PIA meter 2 (28) are installed on the secondary buffer tank (24), the PT meter 2 (27) and the PIA meter 2 (28) are both connected to a PLC control circuit, the PLC control circuit is connected to control a variable frequency motor 2 (26), the variable frequency motor 2 (26) is used to drive the internal piston of the compressor body 2 (21) to operate, and the air inlet end of the secondary cooler (22) is connected to the exhaust pipe 1 (53).

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