Refrigeration system
By designing a refrigeration system with parallel throttling and bypass structures, the high cost and complex control issues caused by refrigerant pumps were solved, achieving efficient and stable operation at low ambient temperatures and avoiding cavitation wear.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GARRETT MOTION TECH (SHANGHAI) CO LTD
- Filing Date
- 2025-03-12
- Publication Date
- 2026-07-24
AI Technical Summary
Traditional refrigeration systems have refrigerant pumps that increase costs, are prone to cavitation wear, have complex control logic, and are difficult to operate stably at low ambient temperatures.
It adopts a parallel throttling and bypass structure, controls the refrigerant flow through bypass pipelines and bypass valves, avoids the use of refrigerant pumps, and combines an oil-free compressor and air bearing design to achieve high-efficiency operation at low pressure ratios.
It reduces the cost and reliability risks of the refrigeration system, improves the system's stability and ease of control, and enables efficient operation at low ambient temperatures.
Smart Images
Figure CN224551826U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of refrigeration technology, and more specifically, to a refrigeration system. Background Technology
[0002] In low ambient temperatures, traditional air conditioning systems typically utilize a free cooling mode that integrates a compressor and refrigerant pump system to reduce power consumption.
[0003] However, refrigerant pumps have problems such as significantly increasing costs, being prone to cavitation wear, and having very complex control logic. Utility Model Content
[0004] This application addresses the shortcomings of existing methods by proposing a refrigeration system that solves the technical problems of refrigerant pumps significantly increasing costs, being prone to cavitation wear, and having very complex control logic.
[0005] This application provides a refrigeration system, including: A compressor has a compressor inlet and a compressor outlet; A condenser having a condenser inlet connected to the compressor outlet and a condenser outlet; An evaporator has an evaporator inlet and an evaporator outlet connected to the compressor inlet; the evaporator inlet is connected to the condenser outlet. A throttling structure is connected between the condenser outlet and the evaporator inlet; At least one bypass structure is connected between the condenser outlet and the evaporator inlet, and each is arranged in parallel with the throttling structure.
[0006] In some optional embodiments of this application, at least part of the bypass structure includes: a bypass pipeline; The inlet end of the bypass pipe is connected to the condenser outlet, and the outlet end is connected to the evaporator inlet.
[0007] In some optional embodiments of this application, at least part of the bypass structure includes: The bypass pipeline has its inlet end connected to the condenser outlet and its outlet end connected to the evaporator inlet. A bypass valve, installed on a bypass line, is used to increase at least one of the following: the flow capacity, the flow rate, and the flow volume of refrigerant from the condenser outlet to the evaporator inlet.
[0008] In some optional embodiments of this application, the throttling structure includes: The main pipeline has its inlet end connected to the condenser outlet and its outlet end connected to the evaporator inlet. A throttling device, installed on the main pipeline, is used to regulate the flow rate of refrigerant passing through the main pipeline.
[0009] In some optional embodiments of this application, the refrigeration system further includes a first conduit; The inlet end of the first pipeline is connected to the outlet of the condenser; The inlet ends of the bypass pipe of the bypass structure and the main pipe of the throttling structure are each connected to the outlet end of the first pipe.
[0010] In some optional embodiments of this application, the refrigeration system further includes a second pipeline; The outlet ends of the bypass pipeline of the bypass structure and the main pipeline of the throttling structure are each connected to the inlet end of the second pipeline. The outlet of the second pipeline is connected to the inlet of the evaporator.
[0011] In some optional embodiments of this application, the throttling element includes an electronic expansion valve.
[0012] In some optional embodiments of this application, the compressor includes an oil-free compressor.
[0013] In some optional embodiments of this application, the compressor includes a motor, which includes a housing, and a stator and a rotor disposed within the housing; The rotor shaft is rotatably mounted relative to the housing via an air bearing.
[0014] In some optional embodiments of this application, the compressor includes a continuously variable transmission (CVT) driven compressor.
[0015] In some optional embodiments of this application, the refrigeration system further includes a controller; The controller is electrically connected to at least one of the compressor, the throttling mechanism, and the bypass mechanism.
[0016] In some optional embodiments of this application, the refrigeration system further includes a pressure detection device and a temperature detection device; The pressure detection device and temperature detection device are each installed at the evaporator outlet and are each electrically connected to the controller; The controller adjusts the opening of the throttling element of the throttling structure and controls the opening and closing of the bypass pipeline of the bypass structure based on the pressure and temperature of the refrigerant at the evaporator outlet.
[0017] The beneficial technical effects of the technical solutions provided in this application include: In this embodiment, the compressor outlet is connected to the condenser inlet; the condenser outlet is connected to the evaporator inlet through a throttling structure and at least one bypass structure arranged in parallel; and the evaporator outlet is connected to the compressor inlet.
[0018] Low-pressure refrigerant vapor is compressed into a high-pressure state by the compressor. The high-pressure refrigerant vapor is then transferred from the compressor to the condenser, where it is cooled and condensed into a high-pressure refrigerant liquid. This high-pressure refrigerant liquid is then transferred from the condenser to a parallel-connected throttling structure and at least one bypass structure, where its pressure is reduced to a low-pressure refrigerant liquid. The refrigerant flow rate is regulated by the throttling structure, and the addition of at least one bypass structure in parallel enhances the refrigerant's flow capacity under small pressure differences. This allows more refrigerant to be transferred from the throttling structure and at least one bypass structure to the evaporator, where it evaporates into vapor. The low-pressure refrigerant vapor is then transferred from the evaporator to the compressor, enabling the compressor to operate at a low pressure ratio and saving power.
[0019] Compared to related technologies that integrate refrigerant pumps, the embodiments of this application do not require the installation of a refrigerant pump, which can avoid the problems caused by refrigerant pumps, such as high cost, easy cavitation wear, complex control logic, and low stability and reliability.
[0020] In this embodiment, the bypass structure is easy to control, making the operation stable and reliable, and the refrigeration system can operate very efficiently without significantly increasing costs and reliability risks.
[0021] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description
[0022] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figures 1 to 6 The present invention provides a schematic diagram of the module structure of a refrigeration system for several different specific examples.
[0023] Figure label: 100 - Refrigeration system; 10-Compressor; 11-Compressor inlet; 12-Compressor outlet; 20-Condenser; 21-Condenser inlet; 22-Condenser outlet; 30 - Evaporator; 31-Evaporator inlet; 32-Evaporator outlet; 40 - Throttling structure; 41 - Main pipeline; 42 - Throttling element; 50 - Bypass structure; 51 - Bypass pipeline; 52 - Bypass valve; 61-First pipeline; 62-Second pipeline; 63-Third pipeline; 64-Fourth pipeline; 70-Controller; 81-Pressure detection device; 82-Temperature detection device. Detailed Implementation
[0024] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.
[0025] Those skilled in the art will understand that, unless specifically stated otherwise, the terms "described" and "the" as used herein may also include plural forms. It should be further understood that the term "comprising" as used in the specification of this application means the presence of the stated features, integers, and / or components, but does not exclude other features, information, data, steps, operations, elements, components, and / or combinations thereof supported by this art. The term "and / or" as used herein refers to at least one of the items defined by the term; for example, "A and / or B" can be implemented as "A," or as "B," or as "A and B."
[0026] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.
[0027] Small-capacity cooling systems typically use traditional oil-immersed positive displacement compressors, which cannot operate at low pressure ratios. To save power consumption in the compressor, a refrigerant pump is integrated to drive the fluid flow.
[0028] However, refrigerant pumps are typically expensive, significantly increasing costs (especially for small-capacity cooling systems). They are also prone to cavitation wear and have complex control logic (requiring determination of when the pump, compressor bypass valve, or compressor should open or close, and ensuring smooth mode switching). Due to the complexity of switching between different modes, it is difficult to maintain stable control for optimal performance. Pump efficiency also varies under different loads, impacting operating costs.
[0029] The refrigeration system provided in this application is intended to solve the above-mentioned technical problems in related technologies.
[0030] The technical solution of this application and how it solves the above-mentioned technical problems are described in detail below with specific embodiments. It should be noted that the following embodiments can be referenced, borrowed, or combined with each other, and the same terms, similar features, and similar implementation steps in different embodiments will not be described again.
[0031] This application provides a refrigeration system 100, the modular structure of which is shown in the schematic diagram below. Figures 1 to 6As shown, the refrigeration system 100 includes: a compressor 10, a condenser 20, an evaporator 30, a throttling structure 40, and at least one bypass structure 50.
[0032] The compressor 10 has a compressor inlet 11 and a compressor outlet 12. The condenser 20 has a condenser inlet 21 communicating with the compressor outlet 12 and a condenser outlet 22. The evaporator 30 has an evaporator inlet 31 and an evaporator outlet 32 communicating with the compressor inlet 11; the evaporator inlet 31 is connected to the condenser outlet 22. A throttling structure 40 is connected between the condenser outlet 22 and the evaporator inlet 31. At least one bypass structure 50 is connected between the condenser outlet 22 and the evaporator inlet 31, and each is arranged in parallel with the throttling structure 40.
[0033] In this embodiment, the compressor outlet 12 is connected to the condenser inlet 21; the condenser outlet 22 is connected to the evaporator inlet 31 through a throttling structure 40 and at least one bypass structure 50 arranged in parallel; and the evaporator outlet 32 is connected to the compressor inlet 11.
[0034] Low-pressure refrigerant vapor is compressed into a high-pressure state by compressor 10. The high-pressure refrigerant vapor is then transferred from compressor 10 to condenser 20, where it is cooled and condensed into high-pressure refrigerant liquid (releasing heat). The high-pressure refrigerant liquid is then transferred from condenser 20 to a parallel-connected throttling structure 40 and at least one bypass structure 50, where its pressure is reduced to low-pressure refrigerant liquid. The refrigerant flow rate is regulated by the throttling structure 40, and the addition of at least one bypass structure 50 in parallel with the throttling structure 40 enhances the refrigerant's flow capacity under small pressure differences. This allows more refrigerant to be transferred from the throttling structure 40 and at least one bypass structure 50 to evaporator 30, where it evaporates into vapor (absorbing heat). The low-pressure refrigerant vapor is then transferred from evaporator 30 to compressor 10, enabling compressor 10 to operate at a low pressure ratio and saving power consumption.
[0035] Compared to related technologies that integrate refrigerant pumps, the embodiments of this application do not require the installation of a refrigerant pump, which can avoid the problems caused by refrigerant pumps, such as high cost, easy cavitation wear, complex control logic, and low stability and reliability.
[0036] In this embodiment, the bypass structure 50 is easy to control, making the operation stable and reliable, and the refrigeration system 100 can operate very efficiently without significantly increasing costs and reliability risks.
[0037] In some optional embodiments of this application, such as Figures 1 to 3 as well as Figure 6As shown, at least part of the bypass structure 50 includes a bypass line 51 and at least one bypass valve 52. The inlet end of the bypass line 51 is connected to the condenser outlet 22, and the outlet end is connected to the evaporator inlet 31. The bypass valve 52 is disposed on the bypass line 51 and is used to increase at least one of the following: the flow capacity, the flow rate, and the flow rate of refrigerant flowing from the condenser outlet 22 to the evaporator inlet 31.
[0038] Optionally, in this embodiment of the application, by setting a bypass valve 52, the flow rate of the liquid pipeline can be increased, so that the compressor can operate at the lowest possible speed under the relative fluid flow rate, thereby increasing the flow rate and flow capacity under a small pressure difference.
[0039] Optionally, in this embodiment, the bypass valve 52 is used to control the conduction state of the bypass pipeline 51. If the bypass valve 52 is closed, the bypass pipeline 51 is not conducting; if the bypass valve 52 is open, the bypass pipeline 51 is conducting. By setting the opening degree of the bypass valve 52, the flow capacity, flow rate and flow rate of the refrigerant flowing in the bypass pipeline 51 can be adjusted.
[0040] Optionally, such as Figures 1 to 3 as well as Figure 6 As shown, a bypass valve 52 is installed on the bypass pipeline 51.
[0041] Optionally, the bypass valve includes, but is not limited to, an electric bypass valve. An electric bypass valve can increase flow rate under small pressure differentials.
[0042] Optionally, such as Figure 1 , Figure 2 and Figure 4 As shown in the embodiment of this application, the number of bypass structures 50 is one. Figure 1 and Figure 2 As shown, the bypass structure 50 includes a bypass pipe 51 and a bypass valve 52 disposed on the bypass pipe 51. Figure 4 As shown, the bypass structure 50 includes a bypass pipe 51.
[0043] Of course, in other optional embodiments of this application, two or more bypass structures 50 can be provided as needed (e.g., Figure 3 , Figure 5 and Figure 6 As shown), two or more bypass structures 50 are each connected in parallel with the throttling structure 40.
[0044] Optionally, in two or more bypass structures 50, such as Figure 3 As shown, all bypass structures 50 include bypass pipes 51 and bypass valves 52. The bypass pipes 51 and bypass valves 52 are configured in a one-to-one correspondence.
[0045] Optionally, such as Figure 6 As shown, a portion of the bypass structure 50 may include a bypass pipe 51 and a bypass valve 52, while another portion of the bypass structure 50 may only include a bypass pipe 51. In the bypass structure 50 that includes a bypass pipe 51 and a bypass valve 52, the bypass pipe 51 and the bypass valve 52 are arranged in a one-to-one correspondence.
[0046] The embodiments of this application can achieve more precise flow control by adding more bypass valves.
[0047] Optionally, such as Figure 5 As shown, all bypass structures 50 may only include bypass pipes 51.
[0048] In some optional embodiments of this application, such as Figures 1 to 6 As shown, the throttling structure 40 includes a main pipe 41 and a throttling element 42. The inlet end of the main pipe 41 is connected to the condenser outlet 22, and the outlet end is connected to the evaporator inlet 31. The throttling element 42 is disposed on the main pipe 41 and is used to regulate the flow rate of refrigerant flowing through the main pipe 41.
[0049] Optionally, in this embodiment, the throttling element 42 includes an electronic expansion valve.
[0050] In some optional embodiments of this application, such as Figures 1 to 6 As shown, the refrigeration system 100 also includes a first pipe 61; the inlet end of the first pipe 61 is connected to the condenser outlet 22. The inlet ends of the bypass pipe 51 of the bypass structure 50 and the main pipe 41 of the throttling structure 40 are each connected to the outlet end of the first pipe 61.
[0051] In this embodiment, the refrigerant in the condenser 20 is transmitted to the main pipeline 41 and the bypass pipeline 51 via the first pipeline 61.
[0052] In some optional embodiments of this application, such as Figures 1 to 6 As shown, the refrigeration system 100 also includes a second pipe 62; the outlet ends of the bypass pipe 51 of the bypass structure 50 and the main pipe 41 of the throttling structure 40 are each connected to the inlet end of the second pipe 62. The outlet end of the second pipe 62 is connected to the evaporator inlet 31.
[0053] In this embodiment, the refrigerant in both the throttling structure 40 and the bypass structure 50 is transmitted to the evaporator 30 via the second pipeline 62.
[0054] Optionally, such as Figures 1 to 6 As shown in the embodiment of this application, the refrigeration system 100 further includes a third pipe 63, the inlet end of which is connected to the evaporator outlet 32, and the outlet end of which is connected to the compressor inlet 11. The refrigerant of the evaporator 30 is transferred to the compressor 10 via the third pipe 63.
[0055] Optionally, such as Figures 1 to 6 As shown in the embodiment of this application, the refrigeration system 100 further includes a fourth pipe 64, the inlet end of which is connected to the compressor outlet 12, and the outlet end of which is connected to the condenser inlet 21. The refrigerant of the compressor 10 is transferred to the condenser 20 via the fourth pipe 64.
[0056] Optionally, such as Figure 1 As shown in the embodiment of this application, the condenser 20, the parallel throttling device 42 and bypass valve 52, the evaporator 30 and the compressor 10 are connected in sequence through various pipelines to form a closed refrigeration system 100. The refrigerant continuously circulates in the refrigeration system 100, undergoes state changes, and exchanges heat with the outside world.
[0057] In some optional embodiments of this application, compressor 10 includes an oil-free compressor. This eliminates the risk of oil loss in compressor 10.
[0058] In some optional embodiments of this application, the compressor 10 includes a motor, which includes a housing, a stator and a rotor disposed within the housing; the rotor shaft is rotatably disposed relative to the housing via an air bearing.
[0059] In this embodiment, the compressor 10 uses an air bearing that eliminates the risk of oil loss. The air bearing uses gas (e.g., air) as a lubricant. Compared to related technologies that use oil as a lubricant, air lubricant has low viscosity, high temperature resistance, no pollution, and lower load capacity than oil.
[0060] In some optional embodiments of this application, compressor 10 includes a continuously variable transmission (CVT) driven compressor.
[0061] In this embodiment, the compressor 10 employs a variable speed drive and an advanced air bearing design, enabling it to operate efficiently at very low pressure ratios without reducing the efficiency of the air, motor, and inverter, while achieving significant refrigeration cycle benefits and providing competitive overall performance.
[0062] Compared to related technologies that use refrigerant pumps, the embodiments of this application provide a bypass pipeline 51 and a bypass valve 52, which makes the structure more compact and helps to achieve miniaturization.
[0063] Optionally, in this embodiment, the compressor 10 is a centrifugal compressor. Compared to related technologies with integrated refrigerant pumps, the small centrifugal compressor in this embodiment is more cost-effective. Simulations also show competitive performance.
[0064] Optionally, in this embodiment, the compressor 10 is a continuously variable compressor, which has high precision and does not cause sudden changes in pressure ratio. The compressor 10 uses a continuously variable speed drive, which can ensure low-speed operation at low pressure ratios.
[0065] Optionally, compressor 10 is a continuously variable oil-free compressor.
[0066] In some optional embodiments of this application, such as Figures 2 to 6 As shown, the refrigeration system also includes a controller 70, which is electrically connected to at least one of the compressor 10, the throttling structure 40, and the bypass structure 50. The controller 70 enables control and regulation of at least one of the compressor 10, the throttling structure 40, and the bypass structure 50.
[0067] In this embodiment, the speed of the compressor 10 is adjusted by the controller 70 to achieve optimal system efficiency.
[0068] In some optional embodiments of this application, such as Figures 2 to 6 As shown, the refrigeration system also includes a pressure detection device 81 and a temperature detection device 82, each located at (or near) the evaporator outlet 32 and electrically connected to the controller 70. The controller 70 adjusts the opening of the throttling element 42 of the throttling structure 40 based on the refrigerant pressure and temperature at the evaporator outlet 32, thereby controlling the opening and closing of the bypass pipe 51 of the bypass structure 50.
[0069] In this embodiment, pressure detection device 81 is used to detect the refrigerant pressure at evaporator outlet 32, and temperature detection device 82 is used to detect the refrigerant temperature at evaporator outlet 32. Each device feeds back its detection results to controller 70. Controller 70 acquires the refrigerant pressure and temperature at evaporator outlet 32 and, based on these parameters, adjusts the opening or closing of bypass valve 52 to control the opening degree of throttling element 42, thereby ensuring appropriate superheating.
[0070] Optionally, the pressure detection device 81 includes, but is not limited to, a pressure sensor or a pressure measuring instrument. The temperature detection device 82 includes, but is not limited to, a temperature sensor or a temperature detector.
[0071] This application optimizes vapor compression refrigeration systems for low ambient temperatures, proposing a nearly free cooling solution using a small, variable-speed, oil-free centrifugal compressor. The refrigeration system provided in this application, equipped with a foil centrifugal compressor and a liquid bypass valve, can operate very efficiently at low ambient temperatures without significantly increasing cost or reliability risks.
[0072] Optionally, the refrigeration system provided in the embodiments of this application can be manufactured and used in aspects such as compressor mapping simulation, system simulation, application benchmarking and investigation, and design matching between the system and the compressor.
[0073] Optionally, the refrigeration system provided in this application embodiment can be applied to air conditioning systems, energy storage thermal management systems, computer room thermal management systems, or automotive thermal management systems, etc.
[0074] By applying the embodiments of this application, at least the following beneficial effects can be achieved: In this embodiment, the compressor outlet is connected to the condenser inlet; the condenser outlet is connected to the evaporator inlet through a throttling structure and at least one bypass structure arranged in parallel; and the evaporator outlet is connected to the compressor inlet.
[0075] Low-pressure refrigerant vapor is compressed into a high-pressure state by the compressor. The high-pressure refrigerant vapor is then transferred from the compressor to the condenser, where it is cooled and condensed into a high-pressure refrigerant liquid. This high-pressure refrigerant liquid is then transferred from the condenser to a parallel-connected throttling structure and at least one bypass structure, where its pressure is reduced to a low-pressure refrigerant liquid. The refrigerant flow rate is regulated by the throttling structure, and the addition of at least one bypass structure in parallel enhances the refrigerant's flow capacity under small pressure differences. This allows more refrigerant to be transferred from the throttling structure and at least one bypass structure to the evaporator, where it evaporates into vapor (absorbing heat). The low-pressure refrigerant vapor is then transferred from the evaporator to the compressor, enabling the compressor to operate at a low pressure ratio and saving power.
[0076] Compared to related technologies that integrate refrigerant pumps, the embodiments of this application do not require the installation of a refrigerant pump, which can avoid the problems caused by refrigerant pumps, such as high cost, easy cavitation wear, complex control logic, and low stability and reliability.
[0077] In this embodiment, the bypass structure is easy to control, making the operation stable and reliable. The refrigeration system provided in this embodiment can operate very efficiently without significantly increasing costs and reliability risks.
[0078] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0079] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0080] The above description is only a partial implementation of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application, without departing from the technical concept of this application, also fall within the protection scope of the embodiments of this application.
Claims
1. A refrigeration system, characterized in that, include: A compressor has a compressor inlet and a compressor outlet; The condenser has a condenser inlet and a condenser outlet connected to the compressor outlet; An evaporator having an evaporator inlet and an evaporator outlet communicating with the compressor inlet; The evaporator inlet is connected to the condenser outlet; A throttling structure is connected between the condenser outlet and the evaporator inlet, the throttling structure including a throttling element; At least one bypass structure is connected between the condenser outlet and the evaporator inlet, and each is arranged in parallel with the throttling structure; as well as The controller is electrically connected to at least one of the compressor, the throttling structure, and the at least one bypass structure. The bypass structure includes at least a bypass pipe and a bypass valve. The inlet end of the bypass pipe is connected to the condenser outlet, and the outlet end of the bypass pipe is connected to the evaporator inlet. The bypass valve is located on the bypass pipe. The controller is configured to adjust the opening degree of the throttling element of the throttling structure according to the pressure and temperature of the refrigerant at the evaporator outlet, and to control the on / off state of the bypass pipeline of the at least one bypass structure.
2. The refrigeration system according to claim 1, characterized in that, The throttling structure also includes: The main pipeline has its inlet end connected to the condenser outlet and its outlet end connected to the evaporator inlet. The throttling device is installed on the main pipeline.
3. The refrigeration system according to claim 1 or 2, characterized in that, It also includes the first pipeline; The inlet end of the first pipeline is connected to the outlet of the condenser; The inlet ends of the bypass pipe of the bypass structure and the main pipe of the throttling structure are each connected to the outlet end of the first pipe.
4. The refrigeration system according to claim 1 or 2, characterized in that, It also includes a second pipeline; The outlet ends of the bypass pipe of the bypass structure and the main pipe of the throttling structure are each connected to the inlet end of the second pipe. The outlet end of the second pipeline is connected to the inlet of the evaporator.
5. The refrigeration system according to claim 2, characterized in that, The throttling device includes an electronic expansion valve.
6. The refrigeration system according to claim 1, characterized in that, The compressor includes an oil-free compressor.
7. The refrigeration system according to claim 1 or 6, characterized in that, The compressor includes a motor, which includes a housing and a stator and a rotor disposed within the housing; The rotor's shaft is rotatably mounted relative to the housing via an air bearing.
8. The refrigeration system according to claim 1, characterized in that, The compressor includes a continuously variable transmission (CVT) compressor.
9. The refrigeration system according to claim 1, characterized in that, It also includes pressure detection devices and temperature detection devices; The pressure detection device and the temperature detection device are each located at the outlet of the evaporator and are each electrically connected to the controller.