Intake and exhaust pressure dual-control system of diaphragm compressor

Abstract

The invention discloses an intake and exhaust pressure dual-control system of a diaphragm compressor, and relates to the technical field of diaphragm compressors, the system comprises an intake pipeline I, the intake pipeline I is connected with the intake end of an intake buffer tank, and the exhaust end of the intake buffer tank is connected with the intake end of a compressor body through an intake pipeline II; a second air inlet pipeline is installed on the compressor body, an air inlet valve is installed on the second air inlet pipeline, a PLC is installed on the compressor body, the compressor body is connected with an air outlet pipeline through a second-stage exhaust port, the other end of the air outlet pipeline is connected with the air inlet end of a second-stage cooler, and the air outlet end of the second-stage cooler is connected with an exhaust pipeline and an emptying pipeline. In the adjusting process of the return valve, the variable frequency motor is controlled by the PLC to drive the speed of the piston to be changed from high to low, the electricity consumption of the variable frequency motor is effectively reduced, the frequency adjusting mode enables the variable frequency motor to meet the production requirement, meanwhile, unnecessary energy waste is reduced, and therefore the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of diaphragm compressors, in particular to a diaphragm compressor inlet and outlet pressure dual control system. Background Art

[0002] In the current diaphragm compressor control system, although a certain degree of automation and intelligent control has been achieved, there are still some obvious shortcomings and deficiencies, which have an adverse impact on the operating efficiency, stability and maintenance cost of the equipment in the actual production process.

[0003] First, during the reflux valve adjustment process of the existing diaphragm compressor control system, the traditional control system cannot accurately adjust the main engine piston speed, resulting in high-speed operation of the piston, high energy consumption, and increased operating electricity costs.

[0004] Secondly, when adjusting the reflux, the air pressure at the air inlet is high, which can easily cause the air inlet pressure to be too high and cause the interlocking shutdown, affecting the continuity and stability of production. At the same time, the high-pressure gas will impact the air inlet pipeline instruments and pipelines, increasing the risk of equipment damage.

[0005] During the final reflux adjustment process, the impact of high-pressure gas poses a serious threat to the instruments and pipelines on the intake pipeline. The high-pressure impact accelerates the aging of equipment, resulting in an increase in the damage rate of the instruments and pipelines on the intake pipeline, an increase in maintenance costs, affecting the normal production, and may even cause a complete shutdown of the production line, causing economic losses.

[0006] Based on this, a diaphragm compressor inlet and exhaust pressure dual control system is now provided, which can eliminate the drawbacks of the existing system. Summary of the invention

[0007] The object of the present invention is to provide a dual control system for intake and exhaust pressures of a diaphragm compressor to solve the problems of energy consumption, stability and safety as well as equipment damage and maintenance costs in the background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A dual control system for inlet and exhaust pressure of a diaphragm compressor, comprising an inlet pipeline one, wherein the inlet pipeline one is connected to the inlet end of an inlet buffer tank, and the outlet end of the inlet buffer tank is connected to the inlet end of a compressor body through an inlet pipeline two, an inlet valve is installed on the inlet pipeline two, a PLC controller is installed on the compressor body, the compressor body is connected to the outlet pipeline through a secondary exhaust port, the other end of the outlet pipeline is connected to the inlet end of a secondary cooler, the outlet end of the secondary cooler is connected to an exhaust pipeline and a vent pipeline, the exhaust pipeline and the vent pipeline are respectively equipped with an exhaust valve and a vent valve, a remote pressure gauge is installed on the exhaust pipeline, and the remote pressure gauge is electrically connected to the PLC controller, the outlet pipeline is connected to the inlet pipeline two through a reflux pipeline, a reflux regulating valve is installed on the reflux pipeline, and the reflux regulating valve is electrically connected to the PLC controller.

[0010] Preferably, a PT meter and a PIA meter are installed on the air intake pipeline, and the PT meter and the PIA meter are electrically connected to the PLC controller, and the PLC controller is electrically connected to the variable frequency motor. The output end of the variable frequency motor is fixedly connected to the piston, and the piston is installed inside the compressor body.

[0011] Preferably, the compressor body is connected to an inter-stage pipeline through a first-stage exhaust port, and the inter-stage pipeline is arranged between air cavities of each stage of the compressor body.

[0012] Preferably, a primary cooler and a primary buffer tank are installed on the interstage pipeline.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. In the process of adjusting the reflux valve, the present invention controls the variable frequency motor to drive the piston speed from high to low through the PLC controller, which effectively reduces the power consumption of the variable frequency motor. This frequency adjustment method enables the variable frequency motor to meet production needs while reducing unnecessary energy waste, thereby reducing production costs.

[0015] 2. The present invention avoids damage to instruments and pipelines on the intake pipeline caused by excessive pressure at the intake point due to reflux by controlling the opening degree of the reflux valve and the running speed of the piston. This protection mechanism ensures the long-term stable operation of the intake pipeline and its instruments, extends their service life, and thus reduces maintenance costs and downtime caused by failures.

[0016] 3. The present invention reduces unnecessary low intake pressure interlock parking situations by optimizing the control strategy, which not only reduces the operator's startup operation fatigue and labor intensity, but also improves the overall stability of the system; at the same time, it reduces serious emergencies caused by system equipment failures during the startup process, providing a strong guarantee for production safety.

[0017] 4. The variable frequency motor of the present invention can operate at a reduced frequency, which is an important means of achieving energy conservation. By reducing the operating frequency of the variable frequency motor, not only the energy consumption is reduced, but also the wear of the equipment caused by the high-speed operation of the piston is reduced, thereby extending the service life of the equipment. The dual benefits of energy saving and life extension make the system significantly economical and practical in long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention.

[0019] Notes on the accompanying drawings: 11. Intake pipeline one; 12. Intake buffer tank; 13. Intake pipeline two; 14. Intake valve; 15. Compressor body; 16. Stage one exhaust port; 17. Interstage pipeline; 18. Stage one cooler; 19. Stage one buffer tank; 21. Stage two exhaust port; 22. Exhaust pipeline; 23. Stage two cooler; 24. Exhaust pipeline; 25. Exhaust valve; 26. Vent pipeline; 27. Vent valve; 28. Return pipeline; 29. ​​Return regulating valve; 30. PT instrument; 31. PIA instrument; 32. Frequency conversion motor. DETAILED DESCRIPTION

[0020] 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.

[0021] In one embodiment, Figure 1 As shown, a diaphragm compressor intake and exhaust pressure dual control system includes an intake pipeline 11, the intake pipeline 11 is connected to the intake end of the intake buffer tank 12, the outlet end of the intake buffer tank 12 is connected to the intake end of the compressor body 15 through an intake pipeline 2 13, an intake valve 14 is installed on the intake pipeline 2 13, a PLC controller is installed on the compressor body 15, the compressor body 15 is connected to the outlet pipeline 22 through the secondary exhaust port 21, and the other end of the outlet pipeline 22 is connected to the secondary cooler 23 The air inlet end is connected, the air outlet end of the secondary cooler 23 is connected with an exhaust pipeline 24 and a vent pipeline 26, the exhaust pipeline 24 and the vent pipeline 26 are respectively installed with an exhaust valve 25 and a vent valve 27, the exhaust pipeline 24 is installed with a remote pressure gauge, and the remote pressure gauge is electrically connected to the PLC controller, the outlet pipeline 22 is connected with the air inlet pipeline 13 through a reflux pipeline 28, the reflux pipeline 28 is installed with a reflux regulating valve 29, and the reflux regulating valve 29 is electrically connected to the PLC controller.

[0022] In this embodiment, the remote pressure gauge monitors the exhaust pressure in real time and transmits the data to the PLC controller.

[0023] The exhaust pressure is controlled within a set range by adjusting the opening degree of the reflux regulating valve 29.

[0024] Specifically, the preset normal value of exhaust pressure is within 20.0 MPa. If it is higher than 21.0 MPa, an alarm will be triggered, and if it is higher than 22.0 MPa, an interlock shutdown will be triggered. At this time, the opening action pressure of the reflux regulating valve 29 is set based on the final normal value of the reference exhaust pressure. Therefore, the lower limit of the reflux regulating valve 29 is set to 19.0 MPa, corresponding to 0% opening of the reflux regulating valve, and the upper limit is set to 20.5 MPa, corresponding to 100% opening of the reflux regulating valve 29, showing a linear change.

[0025] In an optional embodiment, a PT meter 30 and a PIA meter 31 are installed on the intake pipe 11, and the PT meter 30 and the PIA meter 31 are electrically connected to the PLC controller, and the PLC controller is electrically connected to the variable frequency motor 32. The output end of the variable frequency motor 32 is fixedly connected to a piston, and the piston is installed inside the compressor body 15.

[0026] It should be noted that the PT meter 30 monitors the gas pressure of the air intake pipe 11 in real time and transmits the data to the PLC controller.

[0027] The PIA instrument 31 provides real-time pressure display and issues an alarm when the pressure is abnormal, thus enhancing the safety of the system.

[0028] In an optional embodiment, the compressor body 15 is connected to an inter-stage pipeline 17 through a first-stage exhaust port 16 , and the inter-stage pipeline 17 is arranged between the air cavities of each stage of the compressor body 15 .

[0029] It should be noted that the inter-stage pipeline 17 can ensure smooth flow of gas between the gas cavities of each stage, thereby avoiding pressure fluctuation and gas leakage.

[0030] In an optional embodiment, a primary cooler 18 and a primary buffer tank 19 are installed on the inter-stage pipeline 17 .

[0031] It should be noted that a first-stage cooler 18 and a first-stage buffer tank 19 are installed on the interstage pipeline 17. This helps to further reduce the temperature and stabilize the gas flow before the gas enters the next stage of compression, thereby improving the compression efficiency and the reliability of the compressor body 15.

[0032] The above embodiment discloses a dual control system for intake and exhaust pressure of a diaphragm compressor, wherein the normal value, alarm value and interlock shutdown value of the intake pressure and exhaust pressure are first set. For the intake pressure, the normal value is about 2.0MPa, an alarm is triggered when it is lower than 1.6MPa, and an interlock shutdown is triggered when it is lower than 1.2MPa. For the exhaust pressure, the normal value is within 20.0MPa, an alarm is triggered when it is higher than 21.0MPa, and an interlock shutdown is triggered when it is higher than 22.0MPa.

[0033] When the system is operating normally (the intake pressure is not less than 2.0MPa, and the exhaust pressure is not higher than 19MPa), the speed of the piston driven by the variable frequency motor 32 is mainly adjusted according to the opening degree of the reflux regulating valve 29. The opening degree of the reflux regulating valve 29 ranges from 0% (fully closed) to 100% (fully open), thereby controlling the operating frequency of the variable frequency motor 32 to be linearly adjusted between 30HZ and 50HZ. That is, when the opening degree of the reflux regulating valve 29 is between 20% and 100%, the operating speed of the piston will be adjusted between 30HZ and 50HZ to ensure that the exhaust pressure is stable within the set range.

[0034] When the opening degree of the reflux regulating valve 29 is less than 20%, the running speed of the piston is mainly adjusted according to the intake pressure. When the intake pressure changes between 2.0MPa and 1.6MPa, the corresponding operating frequency of the variable frequency motor 32 changes linearly between 50HZ and 30HZ. That is, the lower the intake pressure, the slower the rotation speed of the piston, so as to avoid unstable operation of the compressor due to insufficient intake.

[0035] In addition, the system also sends signals such as the opening degree of the reflux regulating valve 29, the actual collected value of the intake pressure, and the operating status of the variable frequency motor 32 to the PLC controller. The PLC controller performs calculations based on these signals and outputs the results to control and adjust the operating speed of the variable frequency motor 32 to drive the piston.

[0036] This control method not only controls the exhaust pressure within the set range by adjusting the opening degree of the reflux regulating valve 29, but also reduces the rotation speed of the piston when the opening degree of the reflux regulating valve 29 is large, thereby preventing the high-pressure gas from damaging the instruments and pipelines on the intake pipeline. At the same time, by reducing the operating frequency of the variable frequency motor 32, the purpose of energy saving is achieved and the service life of the system equipment is extended.

[0037] 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 dual control system for intake and exhaust pressure of a diaphragm compressor, characterized in that: The invention comprises an air intake pipeline (11), wherein the air intake pipeline (11) is connected to the air intake end of an air intake buffer tank (12), the air outlet end of the air intake buffer tank (12) is connected to the air intake end of a compressor body (15) through an air intake pipeline (13), an air intake valve (14) is installed on the air intake pipeline (13), a PLC controller is installed on the compressor body (15), the compressor body (15) is connected to an air outlet pipeline (22) through a secondary exhaust port (21), the other end of the air outlet pipeline (22) is connected to the air intake end of a secondary cooler (23), and the second air intake pipeline (13) is connected to the air intake end of a secondary cooler (23). The gas outlet end of the stage cooler (23) is connected to an exhaust pipeline (24) and a vent pipeline (26), and an exhaust valve (25) and a vent valve (27) are installed on the exhaust pipeline (24) and the vent pipeline (26) respectively. A remote pressure gauge is installed on the exhaust pipeline (24), and the remote pressure gauge is electrically connected to the PLC controller. The gas outlet pipeline (22) is connected to the second gas inlet pipeline (13) through a return pipeline (28), and a return regulating valve (29) is installed on the return pipeline (28), and the return regulating valve (29) is electrically connected to the PLC controller.

2. A diaphragm compressor inlet and exhaust pressure dual control system according to claim 1, characterized in that: A PT meter (30) and a PIA meter (31) are installed on the first intake pipe (11); the PT meter (30) and the PIA meter (31) are both electrically connected to a PLC controller; the PLC controller is electrically connected to a variable frequency motor (32); an output end of the variable frequency motor (32) is fixedly connected to a piston; and the piston is installed inside a compressor body (15).

3. A diaphragm compressor inlet and exhaust pressure dual control system according to claim 2, characterized in that: The compressor body (15) is connected to an inter-stage pipeline (17) via a first-stage exhaust port (16), and the inter-stage pipeline (17) is arranged between the air cavities of each stage of the compressor body (15).

4. A diaphragm compressor inlet and exhaust pressure dual control system according to claim 3, characterized in that: A primary cooler (18) and a primary buffer tank (19) are installed on the inter-stage pipeline (17).

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