Refrigerating system

Abstract

The utility model relates to the technical field of refrigeration, in particular to a refrigeration system. An energy storage device is arranged between a condenser and an evaporator; the first reversing valve is provided with a first liquid inlet, a first liquid outlet and a second liquid outlet, the second reversing valve is provided with a second liquid inlet, a third liquid inlet and a third liquid outlet, and two ports of the energy storage device are a first port and a second port respectively; a refrigerant output port of the condenser is communicated with the first liquid inlet, the first liquid outlet is communicated with the first port through a first pipeline, and the second liquid outlet is communicated with the second port through a second pipeline; the first port is further communicated with the second liquid inlet through a third pipeline, the second port is further communicated with the third liquid inlet through a fourth pipeline, and the third liquid outlet is communicated with a refrigerant input port of the evaporator. The system can balance the influence of large day and night temperature difference on the load of the refrigeration system, achieves the balance of thermal load, optimizes the refrigeration efficiency, and effectively improves the comfort, reliability and energy-saving performance of the refrigeration system.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration, and particularly relates to a refrigeration system. Background Art

[0002] At present, a refrigeration and air-conditioning system mainly consists of four major parts: a compressor, a condenser, a throttling device, and an evaporator, as well as a supporting controller. Among them, the condenser has a water-cooled type and an air-cooled type, and the throttling device is a capillary tube, or a combination of an expansion valve and a capillary tube. The cooling water required for the water-cooled condenser mainly dissipates heat into the atmosphere through equipment such as a cooling tower. Therefore, like the air-cooled type, the heat exchange effect of the condenser will be affected by the local temperature. When the temperature rises, the heat exchange amount of the condenser decreases. In the case of relatively low temperature, the heat exchange amount of the condenser is high, and the subcooling degree of the refrigeration system (subcooling degree = saturation temperature corresponding to the refrigerant outlet pressure of the condenser - refrigerant outlet temperature of the condenser) is large, which has the following advantages:

[0003] (1) The refrigerating capacity of the evaporator is high, the input power is low, and the energy efficiency ratio is high;

[0004] (2) The refrigerant entering the throttling device is in a liquid state, which is beneficial to the reliability of the expansion valve and the stability of the system.

[0005] However, in the case of relatively high temperature, the heat exchange amount of the condenser is small, the subcooling degree of the refrigeration system becomes smaller or even has no subcooling degree, and the following problems will occur:

[0006] (1) The refrigerating capacity of the evaporator decreases, the input power increases, and the energy efficiency ratio is low;

[0007] (2) The refrigerant entering the capillary tube is in a two-phase state or quickly becomes a two-phase state, resulting in an increase in the pressure drop of the capillary tube, an increase in the exhaust pressure of the compressor, and poor reliability;

[0008] (3) If the refrigerant entering the expansion valve is in a two-phase state, cavitation will occur in the valve, which not only reduces the service life of the expansion valve and generates noise, but also makes the refrigerant flow unstable, and the stability of the refrigeration system also deteriorates accordingly.

[0009] Now almost all refrigeration and air-conditioning systems are designed based on standard working conditions. However, during actual use, the daytime temperature is often higher than the standard working conditions, and the system under full load conditions cannot meet the user's needs, with high power consumption and poor reliability. The temperature in the early morning, evening, and at night is lower than the standard working conditions, resulting in the compressor needing to be frequently shut down to avoid excessive cooling. However, after the shutdown, the temperature of the refrigeration environment will slowly rise, and even after it becomes relatively high, the system will start refrigerating again, resulting in unstable temperature of the refrigeration environment. Therefore, when the outdoor temperature is lower or higher than the standard working conditions, the heat load is not balanced enough, and it is necessary to make improvements. Summary of the Utility Model

[0010] The purpose of the present utility model is to provide a refrigeration system, which can balance the influence of large day-night temperature difference on the load of the refrigeration system, achieve the balance of heat load, optimize the refrigeration efficiency, and effectively improve the comfort, reliability and energy-saving performance of the refrigeration system whether the outdoor temperature is lower or higher than the standard working condition.

[0011] The technical solution of the present utility model is realized as follows:

[0012] A refrigeration system includes a compressor, a condenser, a throttling device and an evaporator which are connected in sequence by pipelines to form a refrigerant circuit, and an energy storage device is further arranged between the condenser and the evaporator;

[0013] It further includes a first reversing valve and a second reversing valve. The first reversing valve has a first liquid inlet, a first liquid outlet and a second liquid outlet. The second reversing valve has a second liquid inlet, a third liquid inlet and a third liquid outlet. The two ports of the energy storage device are respectively a first port and a second port;

[0014] The refrigerant output port of the condenser is communicated with the first liquid inlet, the first liquid outlet is communicated with the first port through a first pipeline, and the throttling device is arranged at the first port. The second liquid outlet is communicated with the second port through a second pipeline;

[0015] The first port is further communicated with the second liquid inlet through a third pipeline, the second port is further communicated with the third liquid inlet through a fourth pipeline, and the third liquid outlet is communicated with the refrigerant input port of the evaporator.

[0016] Further, the energy storage device adopts an energy accumulator. The first port of the energy accumulator is communicated with one end of a first main pipe. The other end of the first main pipe is provided with a first branch port and a second branch port. The first pipeline is communicated with the first branch port, and the third pipeline is communicated with the second branch port.

[0017] Further, the second port of the energy accumulator is communicated with one end of a second main pipe. The other end of the second main pipe is provided with a third branch port and a fourth branch port. The second pipeline is communicated with the third branch port, and the fourth pipeline is communicated with the fourth branch port.

[0018] Further, a throttling device is further arranged on the first main pipe.

[0019] Further, the refrigeration system further includes an outdoor temperature sensor which is placed in the outdoor environment where the condenser is located for detecting the outdoor temperature.

[0020] Further, the refrigeration system further includes an indoor temperature sensor which is placed in the indoor environment to be refrigerated for detecting the indoor temperature.

[0021] Furthermore, an outdoor fan is provided near the condenser to forcibly disperse the heat generated by the condenser;

[0022] An indoor fan is provided near the evaporator to forcibly flow the cold generated by the evaporator.

[0023] Furthermore, the first reversing valve is a three-way valve or a two-position three-way electromagnetic reversing valve, and the second reversing valve is a three-way valve or a two-position three-way electromagnetic reversing valve.

[0024] Furthermore, the three-way valve is an electric three-way regulating valve or a manual three-way regulating valve.

[0025] Furthermore, a control system is included, and the compressor, the condenser, and the evaporator are electrically connected to the control system respectively.

[0026] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0027] This application provides a refrigeration system. An energy storage device is arranged between the condenser and the evaporator. The refrigeration system has at least two state mechanisms. The first state mechanism is: when the heat load is small (such as at night when the outdoor temperature is lower than the standard working condition), the first liquid inlet of the first reversing valve is communicated with the first liquid outlet, while the second liquid outlet is in a closed state, and the third liquid inlet of the second reversing valve is communicated with the third liquid outlet, while the second liquid inlet is in a closed state. In this state mechanism, the refrigeration system stores the excess refrigeration capacity in the energy storage device. The second state mechanism is: when the heat load is large (such as during the day when the outdoor temperature is higher than the standard working condition), the first liquid inlet of the first reversing valve is communicated with the second liquid outlet, while the third liquid outlet is in a closed state, and the second liquid inlet of the second reversing valve is communicated with the third liquid outlet, while the third liquid inlet is in a closed state. In this state mechanism, the refrigeration capacity of the energy storage device is released. In this way, regardless of whether the outdoor temperature is lower or higher than the standard working condition, the influence of the large day-night temperature difference on the load of the refrigeration system is balanced, the heat load is balanced, the refrigeration efficiency is optimized, and the comfort, reliability, and energy saving of the refrigeration system are effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a schematic structural diagram of the refrigeration system of the present utility model when the heat load is small (in the first state mechanism);

[0030] Figure 2 This is a schematic structural diagram of the refrigeration system of the present utility model when the heat load is large (for the second state mechanism);

[0031] Figure 3 For the present utility model Figure 2 Partial enlarged view of the structure at position A in the present utility model;

[0032] Figure 4 For the present utility model Figure 2 Partial enlarged view of the structure at position B in the present utility model.

[0033] In the figure:

[0034] 1 - Compressor; 2 - Condenser; 3 - Evaporator; 4 - Energy storage device; 5 - Throttling device;

[0035] 6 - First reversing valve; 601 - First liquid inlet; 602 - First liquid outlet; 603 - Second liquid outlet;

[0036] 7 - Second reversing valve; 701 - Second liquid inlet; 702 - Third liquid inlet; 703 - Third liquid outlet;

[0037] 8 - First pipeline; 9 - Second pipeline; 10 - Third pipeline;

[0038] 11 - Fourth pipeline; 12 - First main pipeline; 13 - Second main pipeline. Detailed implementation manners

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0041] It should be noted that: Similar reference numerals and letters denote similar items in the following accompanying drawings. Therefore, once an item is defined in one accompanying drawing, it does not need to be further defined and explained in subsequent accompanying drawings.

[0042] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0043] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0044] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0045] The following will describe in detail some embodiments of the present utility model with reference to the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0046] Embodiment

[0047] Such as Figures 1 - 4, this embodiment provides a refrigeration system, which includes a compressor 1, a condenser 2, a throttling device 5, and an evaporator 3 that are connected in sequence by pipelines to form a refrigerant circuit. An energy storage device is also provided between the condenser 2 and the evaporator 3; the evaporator 3 is placed in the indoor environment to be refrigerated, and the condenser 2 is placed in the outdoor environment separated from the indoor environment. Among them, the condenser 2 (Condenser) is a component of the refrigeration system and belongs to a type of heat exchanger. It can convert gas or vapor into liquid and transfer the heat in the pipes to the air near the pipes in a very fast manner. The working process of the condenser 2 is an exothermic process, so the temperature of the condenser 2 is relatively high. The evaporator 3 is a very important component in the refrigeration system. The low-temperature condensed liquid passes through the evaporator 3 and exchanges heat with the outside air, vaporizing and absorbing heat to achieve the refrigeration effect. The evaporator 3 mainly consists of a heating chamber and an evaporation chamber. The heating chamber provides the heat required for evaporation to the liquid, promoting the liquid to boil and vaporize; the evaporation chamber completely separates the gas-liquid two-phase.

[0048] The refrigeration system further includes a first reversing valve 6 and a second reversing valve 7. The first reversing valve 6 has a first liquid inlet 601, a first liquid outlet 602, and a second liquid outlet 603. The second reversing valve 7 has a second liquid inlet 701, a third liquid inlet 702, and a third liquid outlet 703. The two ports of the energy storage device are respectively a first port and a second port;

[0049] The refrigerant output port of the condenser 2 is communicated with the first liquid inlet 601. The first liquid outlet 602 is communicated with the first port through a first pipeline 8. A throttling device 5 is provided at the first port. The second liquid outlet 603 is communicated with the second port through a second pipeline 9;

[0050] The first port is also communicated with the second liquid inlet 701 through a third pipeline 10. The second port is also communicated with the third liquid inlet 702 through a fourth pipeline 11. The third liquid outlet 703 is communicated with the refrigerant input port of the evaporator 3.

[0051] In this embodiment, the first reversing valve 6 is a three-way valve or a two-position three-way electromagnetic reversing valve, and the second reversing valve 7 is a three-way valve or a two-position three-way electromagnetic reversing valve. Among them, the three-way valve can be an electric three-way regulating valve or a manual three-way regulating valve. Preferably, the first reversing valve 6 is the same as the second reversing valve 7, and both use an electric three-way valve or both use a two-position three-way electromagnetic reversing valve, so as to facilitate unified procurement, convenient electric control, and improve the degree of automation.

[0052] Specifically, the energy storage device adopts an energy accumulator 4. The first port of the energy accumulator 4 is communicated with one end of the first main pipe 12. The other end of the first main pipe 12 is provided with a first branch port and a second branch port. The first pipeline 8 is communicated with the first branch port, and the third pipeline 10 is communicated with the second branch port. The first main pipe 12, the first pipeline 8 and the third pipeline 10 form a tee. A throttling device 5 is arranged on the first main pipe 12. The throttling device 5 adopts a throttle valve.

[0053] The second port of the energy accumulator 4 is communicated with one end of the second main pipe 13. The other end of the second main pipe 13 is provided with a third branch port and a fourth branch port. The second pipeline 9 is communicated with the third branch port, and the fourth pipeline 11 is communicated with the fourth branch port. The second main pipe 13, the second pipeline 9 and the fourth pipeline 11 also form a tee.

[0054] The energy accumulator 4 is an energy storage device that can convert the energy in the system into compressed energy or potential energy and store it at an appropriate time. When the system needs it, it can convert the compressed energy or potential energy into hydraulic or pneumatic energy and release it to replenish the system again. This process of energy conversion and release enables the energy accumulator 4 to absorb energy when the system pressure increases instantaneously, ensuring the normal pressure of the entire system. In this application, by adjusting the first reversing valve 6 and the second reversing valve 7 to respectively switch the positions of their valve cores, the refrigerant flow path is changed, so that when the heat load of the refrigeration system is small, the excess cold energy in the system is stored in the energy accumulator 4; when the heat load of the system is large, the cold energy stored in the energy accumulator 4 is released again.

[0055] This application mainly designs the pipeline structure between the condenser 2 and the evaporator 3 and combines with the reversing valve to automatically switch the refrigerant flow path according to the outdoor temperature, realizing heat load balance.

[0056] The evaporator 3 is placed in the indoor environment to be cooled. An indoor fan is arranged near the evaporator 3 to force the cold air generated by the evaporator 3 to flow. The condenser 2 is placed in the outdoor environment separated from the indoor environment. An outdoor fan is arranged near the condenser 2 to force the heat generated by the condenser 2 to disperse.

[0057] In this embodiment, the refrigeration system further includes an outdoor temperature sensor placed in the outdoor environment where the condenser 2 is located to detect the outdoor temperature T1.

[0058] The refrigeration system further includes an indoor temperature sensor placed in the indoor environment to be cooled to detect the indoor temperature T2 and determine whether there is a refrigeration demand in the indoor environment.

[0059] The refrigeration system further includes a control system. The compressor 1, the condenser 2, the evaporator 3, the first reversing valve 6, the second reversing valve 7, the indoor fan, the outdoor fan, the indoor temperature sensor, and the outdoor temperature sensor are respectively electrically connected to the control system. The control system uses a controller to control each execution component separately.

[0060] When there is a refrigeration demand in the indoor environment, the refrigeration system adjusts the positions of the valve cores of the first reversing valve 6 and the second reversing valve 7 to open or close according to the outdoor temperature T1 detected by the outdoor temperature sensor, and executes the first state mechanism or the second state mechanism.

[0061] The first state mechanism is (such as Figure 1 ): When the heat load is small (such as at night when the outdoor temperature is low and lower than the standard working condition), the first liquid inlet 601 of the first reversing valve 6 is communicated with the first liquid outlet 602, while the second liquid outlet 603 is in a closed state. The third liquid inlet 702 of the second reversing valve 7 is communicated with the third liquid outlet 703, while the second liquid inlet 701 is in a closed state. In this state mechanism, the circulation path of the refrigerant is formed as a first refrigerant circuit along the compressor 1, the condenser 2, the throttle, the energy storage device 4, the evaporator 3, and the compressor 1. And after the refrigerant passes through the throttling action of the throttle, the temperature of the refrigerant is lower than the freezing point of the energy storage material in the energy storage device 4. Then the refrigerant flows into the energy storage device 4, causing some of the energy storage material in the energy storage device 4 to release heat and solidify, and at the same time temporarily storing part of the refrigerant in the energy storage device 4, so that the refrigeration system can store the excess refrigeration capacity in the energy storage device 4.

[0062] The second state mechanism is (such as Figure 2 ): When the heat load is large (such as during the day when the outdoor temperature is high and higher than the standard working condition), the first liquid inlet 601 of the first reversing valve 6 is communicated with the second liquid outlet 603, while the third liquid outlet 703 is in a closed state. The second liquid inlet 701 of the second reversing valve 7 is communicated with the third liquid outlet 703, while the third liquid inlet 702 is in a closed state. In this state mechanism, the circulation path of the refrigerant is formed as a second refrigerant circuit along the compressor 1, the condenser 2, the energy storage device 4, the throttle, the evaporator 3, and the compressor 1. And in the second state mechanism, the refrigerant first passes through the energy storage device 4 and then through the throttle, so that the throttle loses the throttling effect on the energy storage device 4. Then when the refrigerant passes through the energy storage device 4, the temperature of the refrigerant is higher than the freezing point of the energy storage material in the energy storage device 4. Then the refrigerant flows into the energy storage device 4, causing some of the energy storage material in the energy storage device 4 to absorb heat and melt, and at the same time releasing the refrigerant temporarily stored in the energy storage device 4. In this state mechanism, the refrigeration capacity of the energy storage device 4 is released.

[0063] In this way, through these two state mechanisms, the refrigeration system can balance the impact of large day-night temperature differences on the refrigeration system load whether the outdoor temperature is lower or higher than the standard working condition, achieving the balance of heat load, optimizing the refrigeration efficiency, and effectively improving the comfort, reliability, and energy efficiency of the refrigeration system.

[0064] Specifically, the air temperature under the standard tooling can be set as the standard air temperature T. First, the indoor temperature T2 detected by the indoor temperature sensor is used, and the electrical signal of the indoor temperature T2 is sent to the control system to determine whether cooling is required indoors. One way for the control system to determine whether cooling is required is to set a temperature T3 in the system. When the indoor air temperature T2 is lower than T3, the control system determines that cooling is not required indoors; when the indoor air temperature T2 is not lower than T3, the control system determines that there is a cooling demand indoors. When there is a cooling demand indoors, the control system can control the operation of the refrigeration system. After the refrigeration system operates, the outdoor temperature T1 measured by the outdoor temperature sensor is used, and the electrical signal of the outdoor temperature T1 is sent to the control system to switch between the first state mechanism and the second state mechanism. When the outdoor temperature T1 is less than the standard air temperature T, the control system determines that the refrigeration system is in a state of low heat load, and then the control system controls the refrigeration system to switch to the first state mechanism; conversely, when the outdoor temperature T1 is greater than the standard air temperature T, the control system determines that the refrigeration system is in a state of high heat load, and then the control system controls the refrigeration system to switch to the second state mechanism.

[0065] The beneficial effects of the technical solution of the present utility model are:

[0066] During the operation of the refrigeration system, through the switching between the first state mechanism and the second state mechanism, whether the outdoor air temperature is lower or higher than the standard working condition, it can balance the impact of large day-night temperature differences on the refrigeration system load, achieve the balance of heat load, optimize the refrigeration efficiency, and effectively improve the comfort, reliability, and energy efficiency of the refrigeration system.

[0067] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

[0068] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A refrigeration system, comprising a compressor (1), a condenser (2), a throttling device (5) and an evaporator (3) which are connected in sequence by pipelines to form a refrigerant circuit, characterized in that: An energy storage device is also provided between the condenser (2) and the evaporator (3); It also comprises a first reversing valve (6) and a second reversing valve (7), wherein the first reversing valve (6) has a first liquid inlet (601), a first liquid outlet (602) and a second liquid outlet (603), and the second reversing valve (7) has a second liquid inlet (701), a third liquid inlet (702) and a third liquid outlet (703), and the two ports of the energy storage device are respectively the first port and the second port; The refrigerant outlet of the condenser (2) is in communication with the first liquid inlet (601), the first liquid outlet (602) is in communication with the first port via a first pipeline (8), and the throttling device (5) is provided at the first port, and the second liquid outlet (603) is in communication with the second port via a second pipeline (9); The first port is also connected to the second liquid inlet (701) via a third pipeline (10), the second port is also connected to the third liquid inlet (702) via a fourth pipeline (11), and the third liquid outlet (703) is connected to the refrigerant input port of the evaporator (3).

2. The refrigeration system according to claim 1, characterized in that: The energy storage device adopts an energy accumulator (4), a first port of the energy accumulator (4) is connected to one end of a first main pipe (12), the other end of the first main pipe (12) is provided with a first branch port and a second branch port, the first pipeline (8) is connected to the first branch port, the third pipeline (10) is connected to the second branch port, and the throttling device (5) is also provided on the first main pipe (12).

3. The refrigeration system according to claim 2, characterized in that: The second port of the energy accumulator (4) is connected to one end of a second main pipe (13), the other end of the second main pipe (13) is provided with a third branch port and a fourth branch port, the second pipeline (9) is connected to the third branch port, and the fourth pipeline (11) is connected to the fourth branch port.

4. The refrigeration system according to claim 1, characterized in that: The throttling device (5) is a throttling device.

5. The refrigeration system according to claim 1, characterized in that: The refrigeration system also includes an outdoor temperature sensor, which is placed in the outdoor environment where the condenser (2) is located and is used to detect the outdoor temperature.

6. The refrigeration system according to claim 1, characterized in that: The refrigeration system also includes an indoor temperature sensor, which is placed in the indoor environment to be refrigerated to detect the indoor temperature.

7. The refrigeration system according to claim 1, characterized in that: An external fan is provided near the condenser (2) for forcibly dissipating the heat generated by the condenser (2); An internal fan is provided near the evaporator (3) for forcing the cold energy generated by the evaporator (3) to flow.

8. The refrigeration system according to claim 1, characterized in that: The first reversing valve (6) is a three-way valve or a two-position three-way electromagnetic reversing valve, and the second reversing valve (7) is a three-way valve or a two-position three-way electromagnetic reversing valve.

9. The refrigeration system according to claim 8, characterized in that: The three-way valve is an electric three-way regulating valve or a manual three-way regulating valve.

10. The refrigeration system according to claim 1, characterized in that: It also includes a control system, and the compressor (1), the condenser (2) and the evaporator (3) are electrically connected to the control system respectively.

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