Automatic control device for economizer line of refrigerating high temperature unit
By introducing an automatic control device into the high-temperature refrigeration unit, and using temperature measuring points and a PLC system to precisely adjust the Freon temperature, the problem of the economizer's inability to be automatically controlled was solved. This achieved energy saving, consumption reduction, and efficient operation of the refrigeration system, and improved the convenience of production management and the stability of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XINJIANG EAST HOPE NEW ENERGY CO LTD
- Filing Date
- 2025-06-17
- Publication Date
- 2026-07-24
AI Technical Summary
The economizer of the high-temperature refrigeration unit cannot achieve automatic control, which leads to the problem of Freon overheating, affecting the efficiency and energy consumption of the refrigeration system and increasing production costs.
The system employs a first temperature measuring point, solenoid valves, and a PLC system to automatically control the economizer pipeline, thereby achieving precise temperature regulation and flow management of Freon. Combined with high-precision temperature sensors and normally closed solenoid valves, the system ensures stability and safety.
It achieves energy saving and consumption reduction in the refrigeration system, improves the refrigeration effect, reduces energy consumption, reduces labor operation costs, enhances system stability and equipment lifespan, and supports remote monitoring and management.
Smart Images
Figure CN224551836U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of refrigeration equipment, specifically an automatic control device for the economizer pipeline of a high-temperature refrigeration unit. Background Technology
[0002] In industrial production, the stable operation and high efficiency of refrigeration systems are crucial for ensuring the smooth progress of production processes. As a key piece of equipment in the production process, the operation of the economizer in the high-temperature refrigeration unit directly affects the energy consumption and efficiency of the entire refrigeration system.
[0003] The economizer has significant drawbacks in its operation. Currently, the economizer can only be manually controlled and cannot be automatically controlled. This limitation prevents the economizer from fully utilizing its capabilities and makes it difficult to meet the ever-increasing production demands. Manual control not only increases labor costs, but also, due to the untimely and inaccurate nature of manual operation, prevents the economizer from operating under optimal conditions, thus resulting in energy waste.
[0004] Specifically, because the economizer cannot be fully utilized, it is difficult to accurately control the temperature and flow of Freon during the operation of the refrigeration system, resulting in significant overheating issues of Freon in the high-temperature units of the refrigeration unit. This not only affects the cooling effect of the refrigeration system but also leads to high system energy consumption, increasing the company's production costs and reducing its competitiveness in the market.
[0005] In order to meet production needs and reduce system energy consumption, this application proposes an automatic control device for the economizer pipeline of a high-temperature chiller unit. Utility Model Content
[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to solve the problem of Freon overheating in high-temperature refrigeration units. By modifying the economizer pipeline, the role of the economizer in the system is enhanced, thereby upgrading the refrigeration system, reducing system energy consumption, and improving the efficiency of the refrigeration system.
[0007] The solution adopted by this utility model is: an automatic control device for the economizer pipeline of a high-temperature chiller unit, characterized in that it includes a first temperature measuring point, a solenoid valve and a PLC system;
[0008] The first temperature measuring point is set at the liquid phase outlet line of the economizer to detect the temperature of the liquid phase from Freon to the gas-liquid separator and to supply a temperature sensing signal to the PLC system.
[0009] The solenoid valve is installed on the liquid supply line of the economizer and connected to the PLC system, and its opening and closing are controlled by the PLC system.
[0010] The PLC system is used to receive the signal from the first temperature measuring point and control the opening and closing of the solenoid valve according to the preset logic.
[0011] As a preferred implementation, when the liquid phase temperature detected by the first temperature measuring point is higher than the set value, the PLC system controls the solenoid valve to open and supply Freon to the economizer.
[0012] In a preferred embodiment, the first temperature measuring point, the solenoid valve, and the PLC system are connected by a line to realize signal transmission and control command transmission.
[0013] As a preferred embodiment, the preset logic within the PLC system further includes that when the liquid phase temperature detected by the first temperature measuring point is lower than another set value, the PLC system controls the solenoid valve to close, stopping the supply of refrigerant to the economizer.
[0014] As a preferred embodiment, the first temperature measuring point is a high-precision temperature sensor with a measurement accuracy of ±0.1℃.
[0015] As a preferred embodiment, the solenoid valve is a normally closed solenoid valve, which remains closed when no open signal is received from the PLC system.
[0016] As a preferred embodiment, the PLC system is equipped with a communication interface for data interaction with a host computer, so as to remotely monitor and adjust control parameters.
[0017] As a preferred embodiment, the economizer supply line is also equipped with a filter to filter impurities in the Freon and protect the solenoid valve and the entire system for stable operation.
[0018] Beneficial effects:
[0019] I. Energy saving and consumption reduction: By automatically controlling the liquid supply of the economizer, the operation of the refrigeration system is optimized, the number of refrigeration units that need to be turned on is reduced, the system energy consumption is reduced, and a lot of energy costs are saved for enterprises.
[0020] II. Improved System Efficiency: Precise control of Freon temperature and flow rate effectively solves the problem of Freon overheating, enhances the role of the economizer in the system, thereby improving the overall efficiency of the refrigeration system and ensuring smooth production.
[0021] III. Intelligent Control: The PLC system is used for automated control, combined with high-precision temperature sensors and solenoid valves, to realize intelligent control of the economizer pipeline, reduce manual operation costs, and improve the accuracy and timeliness of control.
[0022] IV. Remote Monitoring and Management: The PLC system's communication interface facilitates data interaction with the host computer, supports remote monitoring and adjustment of control parameters, enabling operators to understand the system's operating status in a timely manner and optimize it, thus improving the convenience and efficiency of production management.
[0023] V. Enhanced System Stability: The normally closed solenoid valves and filters on the liquid supply line improve the safety and stability of the system, effectively reduce equipment failures, extend equipment lifespan, and lower equipment maintenance costs. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0025] Figure label:
[0026] 1. First temperature measuring point; 2. Economizer liquid phase outlet line; 3. Solenoid valve; 4. Economizer; 5. Economizer liquid supply line; 6. Second temperature measuring point. Detailed Implementation
[0027] The foregoing and other technical contents, features and effects of this utility model are described in conjunction with the appendix below. Figure 1 The detailed description of the embodiments will clearly demonstrate this. All structural details mentioned in the following embodiments are based on the accompanying drawings.
[0028] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.
[0029] Example 1: Automatic control retrofit device for the pipeline of the economizer 4 of the high temperature unit of the refrigeration unit, mainly including the first temperature measuring point 1, the solenoid valve 3 and the PLC system.
[0030] First temperature measuring point 1: Located at the liquid phase outlet of the economizer 4, its main function is to detect the liquid phase temperature of the Freon in the gas-liquid separator and convert the detected temperature information into a temperature sensing signal, which is then supplied to the PLC system in real time. This setting can accurately obtain the liquid phase temperature data of the Freon, providing a basis for subsequent control operations.
[0031] The second temperature measuring point 2 is set on the connection line between the economizer and the compressor head. It is used to detect the temperature of the steam delivered by the economizer to the compressor head and to supply a temperature sensing signal to the PLC system to ensure the steam temperature balance and achieve the purpose of reducing energy consumption.
[0032] Solenoid valve 3: Installed on the economizer supply line 5 and connected to the PLC system. The opening and closing of solenoid valve 3 is controlled by the PLC system. When the PLC system receives the temperature signal from the first temperature measuring point 1 and determines that refrigerant needs to be supplied to the economizer 4, it sends an opening command to solenoid valve 3, which opens to supply refrigerant to the economizer 4. Conversely, when no supply is needed, the PLC system controls solenoid valve 3 to close.
[0033] The PLC system, as the core control unit of the entire retrofit device, receives signals from the first temperature measuring point 1. The PLC system has a pre-set logic program that controls the opening and closing of the solenoid valve 3 according to the received temperature signal. For example, when the liquid phase temperature detected by the first temperature measuring point 1 is higher than a set value, the PLC system controls the solenoid valve 3 to open, supplying refrigerant to the economizer 4 to cool the refrigerant inside and improve the efficiency of the refrigeration system. When the liquid phase temperature detected by the first temperature measuring point 1 is lower than another set value, the PLC system controls the solenoid valve 3 to close, stopping the supply of liquid to the economizer 4 to avoid excessive liquid supply causing energy waste and system instability.
[0034] In addition, to ensure stable operation and functional expansion of the device, it also has the following features:
[0035] The first temperature measuring point 1 and the solenoid valve 3 are connected to the PLC system via a line to realize signal transmission and control command transmission, ensuring accurate information transmission and timely control.
[0036] The first temperature measuring point 1 uses a high-precision temperature sensor with a measurement accuracy of ±0.1℃, which can accurately measure the temperature of the Freon liquid phase, providing accurate data support for the PLC system and making the control more precise.
[0037] Solenoid valve 3 is a normally closed solenoid valve, which remains closed when no start signal is received from the PLC system. This can prevent Freon leakage when the system is not started or in abnormal situations, thus improving the safety and stability of the system.
[0038] The PLC system is equipped with a communication interface for data exchange with a host computer. Through this interface, operators can remotely monitor and adjust control parameters, facilitating system management and optimization and improving production flexibility and convenience.
[0039] The economizer's liquid supply line 5 is also equipped with a filter to remove impurities from the Freon. The filter effectively protects the solenoid valve 3 and the entire system, ensuring stable operation, preventing damage from impurities, and extending the equipment's lifespan.
[0040] During use, install the first temperature measuring point 1: At the liquid phase outlet of the economizer 4, select a suitable installation location and install a high-precision temperature sensor as the first temperature measuring point 1. Ensure the temperature sensor is securely installed and tightly connected to the pipeline to avoid temperature measurement errors. After installation, connect the signal transmission line of the temperature sensor to the PLC system to ensure the stability of signal transmission.
[0041] Install solenoid valve 3: On the economizer supply line 5, select and install a normally closed solenoid valve 3 of appropriate specifications according to the pipe diameter and flow requirements. During installation, pay attention to the installation direction of solenoid valve 3 to ensure proper refrigerant flow. Connect the control circuit of solenoid valve 3 to the PLC system to enable PLC control of solenoid valve 3.
[0042] Install a filter: Install a filter on the economizer supply line 5, upstream of solenoid valve 3. The filter should be easy to disassemble and clean to ensure it can effectively filter impurities in the Freon and protect the system equipment.
[0043] PLC System Upgrade and Retrofit: Upgrade the software program and control logic of the original PLC system. Write program code to receive the signal from the first temperature measuring point 1 and control the solenoid valve 3 to switch according to the preset logic, input the preset temperature setpoint into the PLC system, and set the communication interface parameters to facilitate data interaction with the host computer.
[0044] Debugging the control logic: After completing the hardware installation and PLC system program upgrade, debug the control logic. Simulate different temperature conditions and observe whether the measurement data of the first temperature measuring point 1 is accurate, and whether the PLC system can correctly control the opening and closing of solenoid valve 3 according to the preset logic, ensuring that the entire system operates stably and reliably.
[0045] System Put into Use: After successful debugging, the modified unit was officially put into operation on pipeline 4 of the economizer of the high-temperature chiller unit. During operation, the system operating data was monitored in real time through the communication interface of the PLC system, and the control parameters were adjusted and optimized according to the actual situation to ensure that the system is always in the best operating state.
[0046] The above description is only for illustrating the present utility model. It should be understood that the present utility model is not limited to the above embodiments, and various modifications that conform to the concept of the present utility model are within the protection scope of the present utility model.
Claims
1. An automatic control device for the economizer pipeline of a high-temperature chiller unit, characterized in that, It includes the first temperature measuring point (1), the solenoid valve (3), and the PLC system; The first temperature measuring point (1) is set in the liquid phase outlet line (2) of the economizer to detect the liquid phase temperature of Freon to the gas-liquid separator and to supply temperature sensing signals to the PLC system. The solenoid valve (3) is installed on the liquid supply line (5) of the economizer and connected to the PLC system, and its opening and closing are controlled by the PLC system. The PLC system is used to receive the signal from the first temperature measuring point (1) and control the opening and closing of the solenoid valve (3) according to the preset logic.
2. The automatic control device for the economizer pipeline of the high-temperature chiller unit according to claim 1, characterized in that, When the liquid phase temperature detected by the first temperature measuring point (1) is higher than the set value, the PLC system controls the solenoid valve (3) to open and supply Freon to the economizer (4).
3. The automatic control device for the economizer pipeline of a high-temperature chiller unit according to claim 1, characterized in that, The first temperature measuring point (1), the solenoid valve (3) and the PLC system are connected by a line to realize signal transmission and control command transmission.
4. The automatic control device for the economizer pipeline of the high-temperature chiller unit according to claim 1, characterized in that, The preset logic in the PLC system also includes that when the liquid phase temperature detected by the first temperature measuring point (1) is lower than another set value, the PLC system controls the solenoid valve (3) to close and stop supplying Freon to the economizer (4).
5. The automatic control device for the economizer pipeline of a high-temperature chiller unit according to claim 1, characterized in that, The first temperature measuring point (1) is a high-precision temperature sensor with a measurement accuracy of ±0.1℃.
6. The automatic control device for the economizer pipeline of a high-temperature chiller unit according to claim 1, characterized in that, The solenoid valve (3) is a normally closed solenoid valve (3), which remains closed when it does not receive an opening signal from the PLC system.
7. The automatic control device for the economizer pipeline of a high-temperature chiller unit according to claim 1, characterized in that, The PLC system is equipped with a communication interface for data interaction with a host computer, enabling remote monitoring and adjustment of control parameters.
8. The automatic control device for the economizer pipeline of a high-temperature chiller unit according to claim 1, characterized in that, The economizer supply line (5) is also equipped with a filter to filter impurities in the Freon and protect the solenoid valve (3) and the entire system to ensure stable operation.
9. The automatic control device for the economizer pipeline of a high-temperature chiller unit according to claim 1, characterized in that, The second temperature measuring point (6) is set on the connection line between the economizer and the compressor head, and is used to detect the temperature of the steam delivered by the economizer to the compressor head and to supply a temperature sensing signal to the PLC system.