Vapor compression type refrigerating capacity adjusting system
By introducing a distributor pipe and an electronic expansion valve into the vapor compression refrigeration system, the problem of inaccurate regulation of the refrigeration cycle system in the prior art is solved, achieving high-precision and low-cost refrigeration capacity regulation and ensuring system stability.
Patent Information
- Application Number
- CN202423180894.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2034-12-23
AI Technical Summary
Existing vapor compression refrigeration cycle systems are difficult to precisely adjust when loading or unloading, and frequent start-stop of the compressor or the use of variable frequency compressors can lead to system instability and increased costs.
In a vapor compression refrigeration system, a manifold and an electronic expansion valve are introduced. The refrigerant flow is regulated by adjusting the opening of the electronic expansion valve, and the refrigeration capacity is precisely controlled by the control system, combined with feedback signals from temperature and pressure sensors.
It achieves high-precision and low-cost load control of the refrigeration system, ensuring stable system performance and avoiding instability and increased costs caused by frequent compressor start-stop.
Smart Images
Figure CN223925177U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hot runner technology, and in particular to a vapor compression refrigeration capacity regulation system. Background Technology
[0002] With the development of science and technology and the improvement of people's living standards, the refrigeration industry has become more and more widely used in production and daily life. In some specific fields, it is necessary to lower the air temperature to a lower state or to heat the air temperature to a higher state, which can be achieved by using a vapor compression refrigeration cycle.
[0003] In existing technology (CN2024115415379), in a vapor compression refrigeration cycle system, when the system needs to adjust for loading or unloading, it is usually necessary to use a variable frequency compressor or increase the number of compressors. If a variable frequency compressor is used, the compressor cannot achieve its optimal energy efficiency ratio during frequency conversion, and this may cause system instability. If adjustment is achieved by increasing the number of compressors, it can only be done through the number of compressors starting and stopping, which has limited adjustment capability, allowing only tiered adjustment, and frequent compressor starts and stops can easily damage the compressors. Furthermore, using variable frequency compressors and increasing the number of compressors both increase manufacturing costs, which is not conducive to saving production costs.
[0004] Therefore, a vapor compression refrigeration capacity regulation system needs to be designed to solve the above problems. Utility Model Content
[0005] The purpose of this invention is to provide a vapor compression refrigeration capacity regulation system to overcome the above-mentioned shortcomings of the existing technology.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A vapor compression refrigeration capacity regulation system includes a vapor compression refrigeration system and a control system electrically connected to the vapor compression refrigeration system and used to control and receive various signals and devices. The system is characterized in that: the vapor compression refrigeration system includes a compressor, an evaporator connected to the compressor inlet via a pipeline, a condenser connected to the compressor outlet via an output pipeline, the condenser outlet and the evaporator inlet connected via a refrigerant pipeline, a branch pipe connected externally to the middle portion of the output pipeline; the other end of the branch pipe is connected to the refrigerant pipeline, and an electronic expansion valve is provided on the branch pipe.
[0008] Preferably, a throttling device is provided on the refrigerant pipeline.
[0009] Preferably, the inlet of the output pipeline is connected to the inlet of the electronic expansion valve, and the other end of the electronic expansion valve is connected to the refrigerant pipeline between the outlet of the throttling device and the inlet of the evaporator. The electronic expansion valve is controlled by the control system.
[0010] The beneficial effects of this utility model are: by connecting a branch pipe to the pipeline between the compressor and the condenser and installing an electronic expansion valve on the branch pipe, the load control of the refrigeration system can be achieved more accurately through the addition of the electronic expansion valve and remote control adjustment. The adjustment accuracy is high, the cost is low, and the performance is stable. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of a vapor compression refrigeration capacity regulating system according to the present invention;
[0012] In the diagram: 1-Evaporator; 2-Compressor; 3-Condenser; 4-Throttling device; 5-Electronic expansion valve; 6-Refrigerant line; 7-Output line; 8-Diverter pipe. Detailed Implementation
[0013] Reference Figure 1 A vapor compression refrigeration capacity regulating system includes a compressor 2, an evaporator 1 connected to the compressor inlet via a pipeline, a condenser connected to the compressor 2 outlet via an outlet pipeline 7, and the outlet of the condenser connected to the evaporator 1 inlet via a refrigerant pipeline 6.
[0014] A throttling device 4 is provided on the refrigerant line 6;
[0015] A branch pipe 8 is connected to the middle section of the output pipe 7; the other end of the branch pipe 8 is connected to the refrigerant pipe 6, and an electronic expansion valve 5 is installed on the branch pipe 8; in order to enable system load adjustment, an inlet pipe of the electronic expansion valve 5 is connected between the system compressor outlet and condenser inlet pipes, and the other end of the electronic expansion valve 5 is connected to the pipe between the throttling device outlet and the evaporator inlet. The electronic expansion valve 5 can be used to achieve system load control and compressor discharge temperature protection.
[0016] The electronic expansion valve 5 is a flow regulating valve that controls the valve opening through an electrical signal, thereby adjusting the refrigerant flow rate. The microcomputer issues control commands based on signals collected by sensors, such as temperature and pressure. The command signals apply pulse voltage through the stator winding of the motor, driving the rotor to move and thus adjusting the valve opening.
[0017] The electronic expansion valve 5 is electrically connected to a control system, and the control system is used to control the switching of the electronic expansion valve 5.
[0018] Several sets of sensors are installed on the pipelines and equipment; each sensor is connected to the electrical signal of the control system to transmit the sensed data to the control system, thereby sensing temperature, pressure, etc.
[0019] When the system is refrigerating, the low-temperature, low-pressure refrigerant liquid absorbs heat from the object being cooled in the evaporator 1 and turns into refrigerant vapor, which enters the compressor 2. The compressor compresses it into high-temperature, high-pressure refrigerant vapor, which then enters the condenser 3. The refrigerant vapor is cooled by the cooling medium in the condenser 3 into medium-temperature, high-pressure liquid refrigerant. After passing through the throttling device 4 to reduce the pressure, it returns to the evaporator 1, thus completing one refrigeration cycle. The entire cycle is carried out in a closed loop within the aforementioned devices and refrigerant pipeline 6.
[0020] In a specific implementation example, when the required cooling capacity of the refrigeration system decreases, the system can increase the opening of the electronic expansion valve 5 according to the required load reduction. As the opening of the electronic expansion valve 5 increases, the bypass flow rate of the high-temperature, high-pressure refrigerant vapor at the compressor 2 outlet through the electronic expansion valve 5 increases, the flow rate in the distributor pipe 8 increases, and the refrigerant flow rate through the condenser 3 in the output pipe 7 decreases. Since the refrigerant bypassing the electronic expansion valve 5 does not dissipate heat from the high-temperature refrigerant in the condenser, the refrigerant remains at a high temperature. This portion of the refrigerant enters the evaporator after passing through the electronic expansion valve 5. Because this portion of the refrigerant is too hot, it will not absorb heat and produce a cooling effect in the evaporator. Furthermore, this portion of the refrigerant occupies a certain amount of evaporation space. Simultaneously, because the refrigerant flow rate decreases after being cooled by the condenser, the amount of refrigerant evaporating in the evaporator decreases, and the cooling capacity also decreases.
[0021] When the cooling capacity required by the refrigeration system increases, the system can reduce the opening of the electronic expansion valve 5 according to the required load. When the opening of the electronic expansion valve 5 decreases, the bypass flow of the high-temperature and high-pressure refrigerant vapor at the compressor outlet through the electronic expansion valve 5 will decrease, and the refrigerant flow through the condenser 3 will increase. Therefore, the amount of low-temperature refrigerant entering the evaporator increases, and the amount of refrigerant that can evaporate and absorb heat in the evaporator increases, thereby increasing the cooling capacity of the system.
[0022] The above process of adjusting the cooling capacity using the electronic expansion valve 5 is also applicable when the system is in heat pump mode. When the system is in heat pump mode, the electronic expansion valve 5 can also be used to adjust the heat pump heating capacity.
[0023] The advantages of this utility model are that, by connecting a branch pipe to the pipeline between the compressor and the condenser and installing an electronic expansion valve on the branch pipe, and by adding an electronic expansion valve and adjusting it remotely, the load control of the refrigeration system can be achieved more accurately, with high adjustment precision, low cost, and stable performance.
[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A vapor compression refrigeration capacity regulation system, comprising a vapor compression refrigeration system and a control system electrically connected to the vapor compression refrigeration system and used to control and receive various signals and devices, characterized in that: The vapor compression refrigeration system includes a compressor, an evaporator connected to the compressor inlet via a pipeline, a condenser connected to the compressor outlet via an output pipeline, and the condenser outlet and the evaporator inlet connected via a refrigerant pipeline. A branch pipe is connected to the middle section of the output pipeline. The other end of the branch pipe is connected to the refrigerant pipeline, and an electronic expansion valve is provided on the branch pipe.
2. The vapor compression refrigeration capacity regulating system according to claim 1, characterized in that: A throttling device is installed on the refrigerant pipeline.
3. The vapor compression refrigeration capacity regulating system according to claim 1, characterized in that: The inlet of the output pipeline is connected to the inlet of the electronic expansion valve, and the other end of the electronic expansion valve is connected to the refrigerant pipeline between the outlet of the throttling device and the inlet of the evaporator. The electronic expansion valve is controlled by the control system.