Thermoelectric control system for air compressor

Abstract

The application provides a thermoelectric control system for an air compressor, comprising: an air compressor unit, the air compressor unit comprising a high-voltage switch, a motor electrically connected with the high-voltage switch, and an air compressor connected with an output shaft of the motor; a control box, the control box being electrically connected with the high-voltage switch and the air compressor, and being used for receiving a parameter signal of the air compressor and controlling opening and closing of the high-voltage switch; a compressed air main pipe, a compressed air inlet of the compressed air main pipe being communicated with a compressed air outlet of the air compressor through a first pipeline, and compressed air outlets of the compressed air main pipe being respectively communicated with compressed air utilization devices through second pipelines, and the second pipelines being provided with pressure sensors and first electromagnetic valves which are electrically connected with the control box; and a DCS system, the DCS system being bidirectionally electrically connected with the control box. The application ensures that the pressure of the compressed air entering the compressed air utilization devices can meet the use requirements of the compressed air utilization devices, and further ensures that the thermoelectric production process can be stably operated.

Description

Technical Field

[0001] This application relates to the field of air compressor technology, and in particular to a thermoelectric control system for air compressors. Background Technology

[0002] An air compressor is a device used to compress gases. A thermal power plant is a highly automated, continuous production system where the vast majority of actuators and control devices rely on compressed air for operation. Without air compressors, it would be difficult for a thermal power plant to achieve automated control and safety protection. Therefore, in the thermal power production process, air compressors are indispensable key equipment, serving as the plant's "breathing system" and providing the necessary power source for the thermal power production equipment.

[0003] However, air compressors are prone to "surging" under low load or high pressure conditions, leading to severe vibration and even impeller damage. To avoid this, it is necessary to monitor parameters such as pressure and flow rate of the air compressor during the thermoelectric production process. This allows for real-time adjustment of these parameters to ensure stable operation of the thermoelectric production process. Based on this, this application proposes a thermoelectric control system for an air compressor. Utility Model Content

[0004] This application provides a thermoelectric control system for an air compressor to solve the technical problems described in the background art.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution: This application provides a thermoelectric control system for an air compressor, including: An air compressor unit, the air compressor unit including a high-pressure switch, a motor electrically connected to the high-pressure switch, and an air compressor connected to the output shaft of the motor; A control box, which is electrically connected to the high-pressure switch and the air compressor, is used to receive parameter signals from the air compressor and control the opening and closing of the high-pressure switch; A compressed air main pipe, wherein the compressed air inlet of the compressed air main pipe is connected to the compressed air outlet of the air compressor through a first pipe, and its compressed air outlet is connected to a compressed air utilization device through a second pipe, wherein a pressure sensor and a first solenoid valve electrically connected to the control box are installed on the second pipe; The DCS system is bidirectionally electrically connected to the control box.

[0006] Optionally, the power input terminal of the high-voltage switch is electrically connected to an electricity meter.

[0007] Optionally, the voltage of the high-voltage switch is 6kV.

[0008] Optionally, the power input terminal of the control box is electrically connected to a control power supply.

[0009] Optionally, the voltage of the control power supply is 400V.

[0010] Optionally, the end of the second pipe away from the compressed air header is connected to a dryer, the outlet of the dryer is connected to a compressed air storage tank through a third pipe, and the outlet of the compressed air storage tank is connected to the compressed air utilization device through a fourth pipe.

[0011] Optionally, a second solenoid valve is provided on both the third pipe and the fourth pipe; The second solenoid valve is electrically connected to the control box.

[0012] Optionally, the motor integrates a current transformer, which is electrically connected to the control box.

[0013] Optionally, there are multiple air compressor units, one of which has its compressed air outlet connected to the first pipe, and the compressed air outlets of the air compressors in the other air compressor units are all connected to a fifth pipe. The ends of the multiple fifth pipes that are away from their corresponding air compressors are all connected to the pipe body of the first pipe.

[0014] The thermoelectric control system for air compressors provided in this application integrates pressure sensors (such as inlet and outlet pressure sensors) and temperature sensors (such as exhaust temperature and lubricating oil temperature sensors) on the air compressor. Each of these integrated sensors is electrically connected to the control box. During the thermoelectric production process, the control box receives parameter signals monitored by these sensors, as well as the pressure signal of the compressed air entering the compressed air utilization device via the second pipeline, and transmits this information to the DCS system. The DCS system then processes the received parameter signals. Specifically, if any of the parameters fails to meet the requirements of the thermoelectric production process, the DCS system sends a command to the control box to disconnect the high-pressure switch, thereby stopping the motor-driven air compressor. This facilitates maintenance and other operations on the air compressor, preventing "surging" of the air compressor under low load or high pressure conditions, which could lead to severe vibration or even impeller damage. This ensures that the pressure of the compressed air entering the compressed air utilization device meets its operating requirements, thus guaranteeing stable operation of the thermoelectric production process. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a connection diagram of a thermoelectric control system for an air compressor provided in an embodiment of this application; Figure 2 This is a connection diagram of a thermoelectric control system for an air compressor provided in another embodiment of this application; Figure 3 This is a connection diagram of a thermoelectric control system for an air compressor provided in another embodiment of this application; Figure 4 This is a connection diagram of a thermoelectric control system for an air compressor provided in another embodiment of this application; Figure 5 This is a connection diagram of a thermoelectric control system for an air compressor provided in another embodiment of this application; Figure 6 This is a connection diagram of a thermoelectric control system for an air compressor provided in another embodiment of this application.

[0017] In the diagram: 101, First pipe; 102, Second pipe; 1021, Pressure sensor; 1022, First solenoid valve; 103, Third pipe; 1031, Second solenoid valve; 104, Fourth pipe; 105, Fifth pipe; 200, Air compressor unit; 201, High-pressure switch; 202, Motor; 2021, Current transformer; 203, Air compressor; 300, Control box; 400, Compressed air main pipe; 500, Compressed air utilization device; 600, DCS system; 700, Electricity meter; 800, Control power supply; 900, Dryer; 1000, Compressed air storage tank. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0019] refer to Figures 1 to 6 This application provides a thermoelectric control system for an air compressor, comprising: Air compressor unit 200 includes a high-pressure switch 201, a motor 202 electrically connected to the high-pressure switch 201, and an air compressor 203 connected to the output shaft of the motor 202; wherein, the high-pressure switch 201 is used to turn the motor 202 on and off. Furthermore, the air compressor 203 used by the applicant is a centrifugal air compressor. The principle of a centrifugal air compressor is that an impeller drives the gas to rotate at high speed, causing the gas to generate centrifugal force. Due to the diffusion flow of the gas in the impeller, the flow velocity and pressure of the gas after passing through the impeller are increased, continuously producing compressed air. The high-pressure switch 201, motor 202, and air compressor 203 are all prior art, and will not be described in detail here.

[0020] The control box 300 is electrically connected to the high-voltage switch 201 and the air compressor 203. It is used to receive parameter signals from the air compressor 203 and control the opening and closing of the high-voltage switch 201. The control box 300 is used in AC 50Hz power systems with voltages below 500V for fire pump control, fan control, lighting distribution control, etc. Its control methods include direct control start, star-delta reduced voltage start control, autotransformer reduced voltage start control, frequency converter start control, soft start control, and other start methods. It is suitable for factories, mines, enterprises, shopping malls, hotels, schools, airports, ports, hospitals, high-rise buildings, residential communities, and other occasions.

[0021] A compressed air header 400 has its compressed air inlet connected to the compressed air outlet of an air compressor 203 via a first pipe 101. Its compressed air outlet is connected to a compressed air utilization device 500 via a second pipe 102. A pressure sensor 1021 and a first solenoid valve 1022, electrically connected to a control box 300, are installed on the second pipe 102. The compressed air, compressed by the air compressor 203, sequentially flows through the first pipe 101, the compressed air header 400, and the second pipe 102 into the compressed air utilization device 500. The pressure of the compressed air entering the device is detected by the pressure sensor 1021 on the second pipe 102. The compressed air utilization device 500 is typically a pneumatic soot blowing device.

[0022] The DCS system 600 is bidirectionally electrically connected to the control box 300. The DCS system 600 is a microprocessor-based automated control system that employs a distributed control function and centralized display operation design; it is also known as a distributed control system. The bidirectional electrical connection between the DCS system 600 and the control box 300 is prior art, therefore, it will not be described in detail here. Specifically, when the pressure sensor 1021 detects that the pressure on the second pipe 102 is less than the pressure required by the compressed air utilization device 500, the DCS system 600 sends a command to the control box 300 to close the first solenoid valve 1022. The control box 300 then closes the first solenoid valve 1022. At the same time, the DCS system 600 sends a command to the control box 300 to close the high-pressure switch 201. The control box 300 then closes the high-pressure switch 201 to stop the operation of the air compressor 203 driven by the motor 202 and to perform maintenance and other operations. After maintenance, the air compressor 203 and the first solenoid valve 1022 are restarted, thereby ensuring the stable operation of the thermal power production process.

[0023] The thermoelectric control system for air compressors provided in this application integrates pressure sensors (such as intake pressure sensors and outlet pressure sensors) and temperature sensors (such as exhaust temperature sensors and lubricating oil temperature sensors) on the air compressor 203. Each of these integrated sensors is electrically connected to the control box 300. During the thermoelectric production process, the control box 300 receives parameter signals monitored by the integrated sensors on the air compressor 203, as well as the pressure signal of the compressed air entering the compressed air utilization device 500 via the second pipe 102, and transmits them to the DCS system 600. The DCS system 600 then processes the received signals. The received parameter signals are processed. Specifically, when any of the above parameters do not meet the parameter requirements of the thermal power production process, the DCS system 600 will send a command to the control box 300 to disconnect the high-pressure switch 201, thereby stopping the operation of the air compressor 203 driven by the motor 202. This facilitates maintenance and other operations on the air compressor 203, thus preventing the air compressor 203 from experiencing "surging" under low load or high pressure conditions, which could lead to severe vibration or even damage to the impeller. This ensures that the pressure of the compressed air entering the compressed air utilization device 500 meets the usage requirements of the compressed air utilization device 500, thereby ensuring the stable operation of the thermal power production process.

[0024] In some embodiments, reference Figure 2The high-voltage switch 201 in this application has an electricity meter 700 electrically connected to its power input terminal. The electricity meter 700 is an instrument used to measure electrical energy, also known as an energy meter, watt-hour meter, or kilowatt-hour meter. In practical use, it should be noted that under low voltage (not exceeding 500 volts) and low current (tens of amps) conditions, the electricity meter 700 can be directly connected to the circuit for measurement. Under high voltage or high current conditions, the electricity meter 700 cannot be directly connected to the line and must be used in conjunction with a voltage transformer or current transformer.

[0025] In the above embodiments, by setting up the electricity meter 700, the total electricity consumption entering the motor 202 can be directly measured, avoiding errors caused by subsequent cable voltage drops. Furthermore, when the motor 202 trips due to a short circuit or overload, the input electricity meter 700 can record the instantaneous power and current peak value at that time, helping to determine the nature of the fault (e.g., whether it is a short circuit impact). Therefore, this application improves the accuracy of calculating the electricity consumption of the motor 202 by setting up the electricity meter 700.

[0026] In some embodiments, the voltage of the high-voltage switch 201 in this application is 6kV. In practical use, the 6kV high-voltage switch 201 only requires a cable of a few tens of square millimeters to meet the transmission requirements, thereby saving a lot of space and installation costs. In addition, the cable cross-section corresponding to the 6kV voltage can be reduced by 10-15 times (compared to lower voltage systems, such as 380V), with almost no voltage drop and higher energy utilization.

[0027] In some embodiments, reference Figure 3 In this application, the power input terminal of the control box 300 is electrically connected to a control power supply 800. The control power supply 800 rectifies and outputs DC 110V power through an auxiliary inverter isolation transformer, and also has a battery charging function.

[0028] In the above embodiment, the power supply 800 provides the electrical energy required for the operation of the control box 300.

[0029] In some embodiments, the voltage of the control power supply 800 in this application is 400V.

[0030] In the above embodiments, compared to the traditional 220V single-phase power supply, the 400V control power supply 800 used in this application is directly compatible with various industrial equipment without the need for voltage reduction. Furthermore, the 400V control power supply 800 typically only requires three phase lines (L1 / L2 / L3), eliminating the need for a neutral wire and making wiring safer.

[0031] In some embodiments, reference Figure 4In this application, the end of the second pipe 102 away from the compressed air main pipe 400 is connected to a dryer 900. The outlet of the dryer 900 is connected to a compressed air storage tank 1000 through a third pipe 103. The outlet of the compressed air storage tank 1000 is connected to a compressed air utilization device 500 through a fourth pipe 104.

[0032] In the above embodiment, the compressed air, after being compressed by the air compressor 203, sequentially enters the dryer 900 through the first pipe 101, the compressed air header 400, and the second pipe 102. The dryer 900 dries the compressed air, ensuring its dryness. The dried compressed air is then stored in the compressed air storage tank 1000 through the third pipe 103, and then enters the compressed air utilization device 500 through the compressed air storage tank 1000 and the fourth pipe 104 for use by the compressed air utilization device 500. The compressed air storage tank 1000 has a certain capacity and can store a sufficient amount of compressed air, thus ensuring that the compressed air utilization device 500 has enough compressed air for its use, thereby ensuring the continuity of the thermal power production process. Furthermore, the compressed air storage tank 1000 used by the applicant is made of carbon steel.

[0033] In some embodiments, reference Figure 4 In this application, a second solenoid valve 1031 is provided on both the third pipe 103 and the fourth pipe 104; wherein the second solenoid valve 1031 is electrically connected to the control box 300. The solenoid valve is an electromagnetically controlled industrial device, a basic component of automation used to control fluids, belonging to actuators, and is not limited to hydraulic or pneumatic; it is used in industrial control systems to adjust the direction, flow rate, speed and other parameters of the medium.

[0034] In the above embodiments, the second solenoid valve 1031 on the third pipe 103 controls the on / off supply of compressed air to the compressed air storage tank 1000 and calculates the flow rate of the compressed air entering the compressed air storage tank 1000. Similarly, the second solenoid valve 1031 on the fourth pipe 104 controls the on / off supply of compressed air to the compressed air utilization device 500 and calculates the flow rate of the compressed air entering the compressed air utilization device 500.

[0035] In some embodiments, reference Figure 5 In this application, a current transformer 2021 is integrated on the motor 202, and the current transformer 2021 is electrically connected to the control box 300. The current transformer 2021 consists of a closed iron core and windings, and it is based on the principle of electromagnetic induction. It is a device used to proportionally convert high voltage or large current into low voltage and small current for measurement and protection.

[0036] In the above embodiment, the current of the motor 202 is detected by the current transformer 2021. The rated current of the motor 202 is 78.5A. When the current transformer 2021 detects that the rated current of the motor 202 is greater than 78.5A, the control box 300 will receive the current signal from the current transformer 2021 and promptly close the high-voltage switch 201 through the control box 300 to stop the motor 202 from running. This ensures the safety of the motor 202 during operation.

[0037] In some embodiments, reference Figure 6 In this application, there are multiple air compressor units 200. The compressed air outlet of the air compressor 203 in one air compressor unit 200 is connected to the first pipe 101. The compressed air outlets of the air compressors 203 in the other air compressor units 200 are all connected to the fifth pipe 105. The ends of the multiple fifth pipes 105 that are away from their corresponding air compressors 203 are all connected to the pipe body of the first pipe 101.

[0038] In the above embodiments, the compressed air generated by the air compressors 203 in the remaining air compressor units 200 enters the first pipe 101 sequentially through the fifth pipe 105. However, in the actual production process of a thermal power plant, one air compressor 203 is often insufficient to meet the production needs of the thermal power plant. In other words, multiple air compressors 203 often need to operate simultaneously in the actual production process of a thermal power plant. This application uses multiple air compressors 203 to operate synchronously, which can ensure that a large amount of compressed air is generated at the same time, thereby improving the output and production efficiency of compressed air, and thus meeting the production needs of the thermal power plant.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A thermoelectric control system for an air compressor, characterized in that, include: An air compressor unit (200) includes a high-pressure switch (201), a motor (202) electrically connected to the high-pressure switch (201), and an air compressor (203) connected to the output shaft of the motor (202). A control box (300) is electrically connected to the high-pressure switch (201) and the air compressor (203) and is used to receive parameter signals from the air compressor (203) and control the opening and closing of the high-pressure switch (201). A compressed air main pipe (400) is provided. The compressed air inlet of the compressed air main pipe (400) is connected to the compressed air outlet of the air compressor (203) through a first pipe (101), and its compressed air outlet is connected to a compressed air utilization device (500) through a second pipe (102). A pressure sensor (1021) and a first solenoid valve (1022) that are electrically connected to the control box (300) are provided on the second pipe (102). DCS system (600), which is bidirectionally electrically connected to the control box (300).

2. The thermoelectric control system for an air compressor according to claim 1, characterized in that, The power input terminal of the high-voltage switch (201) is electrically connected to an electricity meter (700).

3. The thermoelectric control system for an air compressor according to claim 2, characterized in that, The voltage of the high-voltage switch (201) is 6kV.

4. The thermoelectric control system for an air compressor according to claim 1, characterized in that, The power input terminal of the control box (300) is electrically connected to the control power supply (800).

5. The thermoelectric control system for an air compressor according to claim 4, characterized in that, The voltage of the control power supply (800) is 400V.

6. The thermoelectric control system for an air compressor according to claim 1, characterized in that, The end of the second pipe (102) away from the compressed air main pipe (400) is connected to a dryer (900), the outlet of the dryer (900) is connected to a compressed air storage tank (1000) through a third pipe (103), and the outlet of the compressed air storage tank (1000) is connected to the compressed air utilization device (500) through a fourth pipe (104).

7. The thermoelectric control system for an air compressor according to claim 6, characterized in that, A second solenoid valve (1031) is provided on both the third pipe (103) and the fourth pipe (104). The second solenoid valve (1031) is electrically connected to the control box (300).

8. The thermoelectric control system for an air compressor according to claim 1, characterized in that, The motor (202) integrates a current transformer (2021), which is electrically connected to the control box (300).

9. The thermoelectric control system for an air compressor according to any one of claims 1 to 8, characterized in that, There are multiple air compressor units (200). The compressed air outlet of the air compressor (203) in one of the air compressor units (200) is connected to the first pipe (101). The compressed air outlets of the air compressors (203) in the other air compressor units (200) are all connected to a fifth pipe (105). The ends of the multiple fifth pipes (105) that are away from their corresponding air compressors (203) are all connected to the pipe body of the first pipe (101).

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