Refrigerating system and refrigerating equipment for hot gas bypass defrosting

Abstract

The utility model discloses a refrigerating system and refrigerating equipment for hot gas bypass defrosting, the refrigerating system comprises a compressor, an outdoor heat exchanger and at least two indoor heat exchangers, the first end of the outdoor heat exchanger is connected with the exhaust side of the compressor; the first end of the indoor heat exchanger can be switched to be connected with the exhaust side of the compressor or the second end of the outdoor heat exchanger. The second end of the indoor heat exchanger is connected with the suction side of the compressor. The refrigerating system further comprises a defrosting auxiliary device used for heating a refrigerant flowing to the indoor heat exchanger. By introducing the defrosting auxiliary device, the problem that the exhaust heat of the compressor is insufficient can be solved, the defrosting speed is improved, meanwhile, the indoor temperature is prevented from greatly fluctuating, refrigeration is kept while the defrosting efficiency is improved, and the operation performance of a refrigeration system is optimized.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration system technology, and in particular to a refrigeration system and refrigeration equipment with hot gas bypass defrosting. Background Technology

[0002] Refrigeration systems transfer heat through the circulation of refrigerant. Their core components include compressors, condensers, expansion valves, and evaporators, and they are widely used in refrigerators, air conditioners, cold chain logistics, industrial refrigeration, and other fields.

[0003] Taking a common refrigerator as an example, the air humidity inside the freezer compartment is high, while the surface temperature of the evaporator is usually maintained at a low level. This temperature difference easily leads to frost formation on the evaporator surface. For the defrosting needs of frost-free refrigerators, current technology generally uses an electric heating wire installed at the bottom of the evaporator to achieve defrosting. Its working principle is to heat the heating wire by applying electricity, and then transfer the heat to the evaporator surface through radiation and convection, causing the frost layer to gradually melt from the outside in.

[0004] However, this traditional defrosting method has significant drawbacks: on the one hand, the heat transfer path is long and the heat loss is large, resulting in low defrosting efficiency; on the other hand, the excess heat generated during the heating process will significantly increase the internal temperature of the refrigerator, affecting the stability of the storage environment. In addition, relying solely on the heat generated by the compressor operation for defrosting often faces the dilemma of insufficient heat source, easily leading to incomplete defrosting.

[0005] Therefore, how to design refrigeration systems and equipment that can effectively improve defrosting efficiency is a pressing technical issue for the industry. Utility Model Content

[0006] To address the aforementioned deficiencies in existing technologies, this invention proposes a refrigeration system and equipment with hot gas bypass defrosting. By introducing a defrosting auxiliary device, the problem of insufficient heat from the compressor exhaust can be compensated, thereby increasing the defrosting rate and preventing significant fluctuations in indoor temperature, thus optimizing the operating performance of the refrigeration system.

[0007] The technical solution adopted in this utility model is to design a refrigeration system with hot gas bypass defrosting, including: a compressor, an outdoor heat exchanger and at least two indoor heat exchangers. The first end of the outdoor heat exchanger is connected to the exhaust side of the compressor, and the first end of the indoor heat exchanger can be switched to connect to the exhaust side of the compressor or the second end of the outdoor heat exchanger. The second end of the indoor heat exchanger is connected to the suction side of the compressor. The refrigeration system also includes: a defrosting auxiliary device for heating the refrigerant flowing to the indoor heat exchangers.

[0008] Furthermore, the first end of the indoor heat exchanger is connected to the second end of the outdoor heat exchanger via a refrigeration branch pipe, and the first end of the indoor heat exchanger is connected to the exhaust side of the compressor via a bypass branch pipe. The defrosting auxiliary device is installed on the bypass branch pipe, and at most one of the refrigeration branch pipe and the bypass branch pipe of the same indoor heat exchanger can be connected.

[0009] Furthermore, the defrosting auxiliary device is a heating wire, which is wound along the length of the outer wall of the bypass branch pipe.

[0010] Furthermore, each indoor heat exchanger is individually equipped with a throttling element, and the first end of the indoor heat exchanger is connected in series with the throttling element and then connected to the exhaust side of the compressor or the second end of the outdoor heat exchanger.

[0011] Furthermore, a secondary control valve is installed at the first end of the indoor heat exchanger. The secondary control valve is connected to the second end of the outdoor heat exchanger through a refrigeration branch pipe, and the secondary control valve is connected to the exhaust side of the compressor through a bypass branch pipe. The secondary control valve switches between on and off states so that the indoor heat exchanger is connected to the exhaust side of the compressor or the second end of the outdoor heat exchanger.

[0012] Furthermore, all refrigeration branch pipes are installed on a refrigeration control valve, which is connected to the second end of the outdoor heat exchanger via the main pipe. All bypass branch pipes are installed on a bypass control valve, which is connected to the exhaust side of the compressor via the main bypass pipe. The refrigeration control valve switches on and off states to connect or disconnect the refrigeration branch pipes from the main pipe. The bypass control valve switches on and off states to connect or disconnect the bypass branch pipes from the main bypass pipe.

[0013] Furthermore, the refrigeration system also includes a liquid receiver, with the second end of all indoor heat exchangers connected to a manifold via a return pipe, and the liquid receiver connected in series between the manifold and the suction side of the compressor.

[0014] Furthermore, each indoor heat exchanger is individually equipped with a one-way valve, and the second end of the indoor heat exchanger is connected in series with the one-way valve and then connected to the suction side of the compressor.

[0015] This utility model also proposes a refrigeration device, which includes the aforementioned refrigeration system.

[0016] In some embodiments, the refrigeration equipment is a refrigerator, the outdoor heat exchanger is a condenser, and the indoor heat exchanger is an evaporator.

[0017] Compared with existing technologies such as electric heating defrosting or hot gas bypass defrosting, this utility model introduces a defrosting auxiliary device for heating the refrigerant flowing to the indoor heat exchanger, which can compensate for the problem of insufficient heat from the compressor exhaust. Moreover, due to the use of hot gas bypass defrosting, the heat of the high-temperature refrigerant flows from the inside of the indoor heat exchanger to the outside, with minimal heat leakage to the external environment, avoiding large fluctuations in indoor temperature. Furthermore, while improving defrosting efficiency, it maintains refrigeration and optimizes the user experience. Attached Figure Description

[0018] The present invention will now be described in detail with reference to the embodiments and accompanying drawings, wherein:

[0019] Figure 1 This is a connection diagram of the refrigeration system of this utility model;

[0020] Figure 2 This is a connection diagram showing the cooling function of the first indoor heat exchanger and the defrosting function of the second indoor heat exchanger.

[0021] Figure 3 yes Figure 2 A schematic diagram of the refrigerant flow during operation;

[0022] Figure 4 This is a schematic diagram showing the connection between the first indoor heat exchanger defrosting and the second indoor heat exchanger cooling.

[0023] Figure 5 yes Figure 4 A schematic diagram of the refrigerant flow during operation;

[0024] Figure 6 This is a schematic diagram showing the connection of two indoor heat exchangers, both of which are cooling.

[0025] Figure 7 yes Figure 6 A schematic diagram of the refrigerant flow during operation;

[0026] Figure 8 This is a schematic diagram of the control flow of the refrigeration system;

[0027] Figure 9 This is a schematic diagram of the control logic for staggered defrosting of two indoor heat exchangers;

[0028] Attached diagram descriptions: 1. Compressor; 2. Exhaust pipe; 3. Outdoor heat exchanger; 4. Filter; 51 / 52. Throttling element; 6. Bypass control valve; 7 / 8. Indoor heat exchanger; 111 / 112. Defrosting auxiliary device; 17 / 18. Secondary control valve; 91 / 92. Return gas pipe; 12. Refrigeration control valve; 13. Manifold; 14. Liquid receiver. Detailed Implementation

[0029] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0030] like Figure 1 As shown, the refrigeration system proposed in this utility model adopts hot gas bypass defrosting technology. Based on hot gas bypass defrosting, a defrosting auxiliary device 111 / 112 is designed to heat the refrigerant to compensate for the insufficient heat of the compressor 1 exhaust.

[0031] Specifically, the refrigeration system includes: a compressor 1, an outdoor heat exchanger 3, at least two indoor heat exchangers 7 / 8, and a defrosting auxiliary device 111 / 112. The first end of the outdoor heat exchanger 3 is connected to the exhaust side of the compressor 1. The first end of the indoor heat exchanger 7 / 8 can be switched to connect to the exhaust side of the compressor 1 or the second end of the outdoor heat exchanger 3. The second end of the indoor heat exchanger 7 / 8 is connected to the suction side of the compressor 1. The function of the defrosting auxiliary device 111 / 112 is to heat the air flowing to the indoor heat exchanger 7 / 8.

[0032] like Figures 2 to 7 As shown, taking the refrigeration system operating in refrigeration mode as an example, when the first end of an indoor heat exchanger 7 / 8 is connected to the exhaust side of the compressor 1, the indoor heat exchanger 7 / 8 enters the defrost state and acts as a defrost heat exchanger. The high-temperature refrigerant discharged from the compressor 1 flows to both the outdoor heat exchanger 3 and the defrost heat exchanger. After entering the defrost heat exchanger, the high-temperature refrigerant provides heat for defrosting. During the defrost process, the defrost auxiliary device 111 / 112 can be activated to provide heat to heat the refrigerant flowing to the indoor heat exchanger 7 / 8, accelerating the defrost speed and shortening the defrost time. When the first end of an indoor heat exchanger 7 / 8 is connected to the second end of the outdoor heat exchanger 3, the indoor heat exchanger 7 / 8 acts as a refrigeration heat exchanger. The high-temperature refrigerant discharged from the compressor 1 passes through the outdoor heat exchanger 3 before entering the refrigeration heat exchanger.

[0033] It should be understood that components such as heat exchangers typically have two ports for refrigerant inlet and outlet. For ease of distinction, these two ports are referred to as the first port and the second port, respectively. Taking outdoor heat exchanger 3 as an example, when the refrigeration system is operating in cooling mode, the first port of outdoor heat exchanger 3 refers to the inlet port, and the second port refers to the outlet port. If, in practical applications, the refrigeration system can also operate in heating mode, then the first port of outdoor heat exchanger 3 refers to the outlet port, and the second port refers to the inlet port.

[0034] This invention addresses the problem of insufficient heat from the compressor exhaust by introducing a defrosting auxiliary device 111 / 112, optimizing the defrosting effect in two ways. Firstly, after the defrosting auxiliary device 111 / 112 heats the refrigerant, the defrosting speed is accelerated, the defrosting time is shortened, and the refrigeration system can resume normal operation more quickly, avoiding significant fluctuations in indoor temperature and improving the user experience. Secondly, the heat from the high-temperature refrigerant flows from the inside of the indoor heat exchanger 7 / 8 to the outside, minimizing heat leakage to the external environment, which also prevents significant fluctuations in indoor temperature and improves the user experience.

[0035] like Figure 1 As shown, in some preferred embodiments of this utility model, the first end of the indoor heat exchanger 7 / 8 is connected to the second end of the outdoor heat exchanger 3 through a refrigeration branch pipe. The refrigerant flowing out of the outdoor heat exchanger 3 can enter the indoor heat exchanger 7 / 8 through the refrigeration branch pipe. The first end of the indoor heat exchanger 7 / 8 is connected to the exhaust side of the compressor 1 through a bypass branch pipe. The refrigerant discharged by the compressor 1 can enter the indoor heat exchanger 7 / 8 through the bypass branch pipe. The refrigeration branch pipe and the bypass branch pipe are independent of each other, and at most one of the refrigeration branch pipe and the bypass branch pipe can be connected, ensuring that the indoor heat exchanger 7 / 8 can enter the refrigeration state or the defrosting state independently.

[0036] When some indoor heat exchangers (defrosting heat exchangers) in the refrigeration system are in defrosting mode and some indoor heat exchangers (refrigeration heat exchangers) are in refrigeration mode, the defrosting heat exchanger is connected to the exhaust side of compressor 1, and the refrigeration heat exchanger is connected to the outdoor heat exchanger 3. Part of the high-temperature refrigerant discharged by compressor 1 flows into the defrosting heat exchanger for defrosting, and the other part passes through the outdoor heat exchanger 3 and then enters the refrigeration heat exchanger for refrigeration, providing cooling capacity for the room.

[0037] The defrosting auxiliary devices 111 / 112 are installed on the bypass branch pipe. This design utilizes the high-temperature refrigerant discharged from compressor 1 as the primary heat source, supplemented by precise heat replenishment from the defrosting auxiliary devices 111 / 112, to quickly melt the frost layer on the indoor heat exchangers 7 / 8. For example, when indoor heat exchangers 7 / 8 require defrosting, the bypass branch pipe is connected, allowing the high-temperature refrigerant to flow directly to indoor heat exchangers 7 / 8 for defrosting. After the defrosting auxiliary devices 111 / 112 are activated, the refrigerant temperature in the bypass branch pipe increases, ensuring that the refrigerant entering indoor heat exchangers 7 / 8 is sufficiently hot to defrost quickly. The synergistic effect of the high-temperature refrigerant discharged from compressor 1 and the defrosting auxiliary devices 111 / 112 significantly improves defrosting efficiency, greatly shortens defrosting time, and avoids the problem of sudden temperature rise in the room caused by traditional pure electric heating. In addition, the intervention of the defrosting auxiliary devices 111 / 112 can also solve the problem of insufficient discharge temperature of compressor 1 in low-temperature environments.

[0038] It should be noted that in practical applications, the on / off state of the defrosting auxiliary devices 111 / 112 can be controlled according to the frost thickness. Furthermore, the heat output of the defrosting auxiliary devices 111 / 112 can be adjusted according to the defrosting situation, ensuring complete melting of the frost while avoiding energy waste. For example, a pressure sensor is designed at the indoor heat exchanger 7 / 8, with a pre-existing frost gap between the pressure sensor and the pipe wall of the indoor heat exchanger 7 / 8. When the frost thickness of the indoor heat exchanger 7 / 8 exceeds this frost gap, the pressure sensor's detection value changes. When the detection value rises to the upper limit setting value, the defrosting auxiliary devices 111 / 112 are activated; when the detection value drops to the lower limit setting value, the defrosting auxiliary devices 111 / 112 are deactivated.

[0039] The specific type of defrosting auxiliary device 111 / 112 can be designed according to actual needs. For example, in some feasible embodiments of this utility model, the defrosting auxiliary device 111 / 112 is a heating wire. The heating wire is wound along the length direction on the outer wall of the bypass branch pipe. The close contact between the heating wire and the outer wall of the bypass branch pipe can achieve efficient heat conduction. The heat generated after being energized can be quickly conducted through the pipe wall to the refrigerant flowing inside. This method of "heating the medium first and then transferring heat" significantly improves the thermal efficiency compared to the traditional method of electric heating wire directly radiating the evaporator, and the heat distribution is more uniform.

[0040] like Figure 1 As shown, in some preferred embodiments of this utility model, the indoor heat exchanger 7 / 8 is separately equipped with a throttling element 51 / 52. The first end of the indoor heat exchanger 7 / 8 is connected in series with the throttling element 51 / 52 and then connected to the exhaust side of the compressor 1 or the second end of the outdoor heat exchanger 3. The throttling element 51 / 52 can be a capillary tube. When the first end of the indoor heat exchanger 7 / 8 is connected in series with the throttling element 51 / 52 to the exhaust side of the compressor 1, the function of the throttling element 51 / 52 is to throttle the high-temperature gaseous refrigerant discharged by the compressor 1 into a medium-temperature gas-liquid mixture. While improving the defrosting efficiency by releasing latent heat through phase change, it limits the maximum temperature inside the indoor heat exchanger 7 / 8 and prevents the indoor heat exchanger 7 / 8 from overheating and being damaged. When the first end of the indoor heat exchanger 7 / 8 is connected in series with the throttling element 51 / 52 to the outdoor heat exchanger 3, the function of the throttling element 51 / 52 is to reduce the pressure of the high-pressure subcooled liquid refrigerant from the outdoor heat exchanger 3 to a low-temperature gas-liquid two-phase mixed state in the cooling mode, so as to provide the necessary conditions for the evaporation and heat absorption of the indoor heat exchanger 7 / 8.

[0041] like Figure 1As shown, to achieve flexible control of each indoor heat exchanger, in some feasible embodiments of this utility model, a secondary control valve 17 / 18 is installed at the first end of the indoor heat exchanger 7 / 8. The secondary control valve 17 / 18 is connected to the second end of the outdoor heat exchanger 3 via a refrigeration branch pipe, and is also connected to the exhaust side of the compressor 1 via a bypass branch pipe. The secondary control valve 17 / 18 can be a three-way valve, with the first end of the indoor heat exchanger 7 / 8, the refrigeration branch pipe, and the bypass branch pipe respectively connected to the three ports of the secondary control valve 17 / 18. The secondary control valve 17 / 18 switches between on and off states to connect the indoor heat exchanger 7 / 8 to the exhaust side of the compressor 1 or the second end of the outdoor heat exchanger 3. This design integrates the functions that traditionally require multiple valves into a single valve body, simplifying the piping layout, reducing the risk of refrigerant leakage, and making the system structure more compact.

[0042] Similarly, in some feasible embodiments of this utility model, all refrigeration branch pipes are installed on a refrigeration control valve 12, which is connected to the second end of the outdoor heat exchanger 3 via a main pipe. All bypass branch pipes are installed on a bypass control valve 6, which is connected to the exhaust pipe 2 of the compressor 1 via a main bypass pipe. The refrigeration control valve 12 switches between on and off states to connect or disconnect the refrigeration branch pipes from the main pipe, thereby distributing refrigerant from the outdoor heat exchanger 3 to the indoor heat exchangers 7 / 8. The bypass control valve 6 switches between on and off states to connect or disconnect the bypass branch pipes from the main bypass pipe, thereby distributing refrigerant from the exhaust side of the compressor 1 to the indoor heat exchangers 7 / 8. The refrigeration control valve 12 serves as the central hub for the refrigerant flow distribution, and the bypass control valve 6 serves as the central hub for the bypass defrosting refrigerant flow distribution. The integrated valve body design reduces the number of sealing points, significantly lowering the risk of refrigerant leakage.

[0043] like Figure 1 As shown, in some feasible embodiments of this utility model, the refrigeration system further includes: a liquid receiver 14. The second ends of all indoor heat exchangers 7 / 8 are connected to a manifold 13 via return pipes 91 / 92. The liquid receiver 14 is connected in series between the manifold 13 and the suction side of the compressor 1. More specifically, the return pipes 91 / 92 of all indoor heat exchangers 7 / 8 are connected to the manifold 13, the outlet of the manifold 13 is connected to the liquid receiver 14, and the outlet of the liquid receiver 14 is connected to the suction port of the compressor 1. The refrigerant flowing out of the indoor heat exchangers 7 / 8 enters the liquid receiver 14. The liquid receiver 14 uses internal baffles, filters, and other structures to trap the liquid refrigerant, preventing liquid refrigerant from entering the compressor 1 and causing liquid slugging, which could damage the compressor 1.

[0044] To improve heat exchange efficiency, the throttling elements 51 / 52 (capillary tubes) and return pipes 91 / 92 of the indoor heat exchangers 7 / 8 are soldered together along their length to form a return pipe assembly. During cooling operation, the low-temperature, high-pressure liquid in the throttling element 51 / 52 and the low-temperature, low-pressure gas in the return pipe 91 / 92 exchange heat through the solder layer. The liquid in the throttling element 51 / 52 is pre-cooled by the gas in the return pipe 91 / 92, increasing the subcooling and improving the cooling effect. The gas in the return pipe 91 / 92 is pre-heated by the liquid in the throttling element 51 / 52, increasing the suction superheat and reducing the risk of liquid slugging in compressor 1.

[0045] To improve the reliability of the refrigeration system, indoor heat exchangers 7 / 8 are also equipped with individual one-way valves. The second end of indoor heat exchanger 7 / 8 is connected in series with the one-way valve and then connected to the suction side of compressor 1. The one-way valve ensures that the refrigerant flowing out of the indoor heat exchanger flows unidirectionally into the suction side of compressor 1. Especially in scenarios where the refrigeration system has two or more indoor heat exchangers 7 / 8, if some indoor heat exchangers are not running, the refrigerant will not flow backwards into the stopped indoor heat exchangers, thus improving the reliability and stability of the refrigeration system.

[0046] This invention also proposes a refrigeration device, which includes the aforementioned refrigeration system. When the refrigeration device is a refrigerator, the outdoor heat exchanger 3 is a condenser, and the indoor heat exchangers 7 / 8 are evaporators. This refrigeration device introduces a defrosting auxiliary device for heating the refrigerant flowing to the indoor heat exchangers, which can compensate for insufficient heat from the compressor exhaust. Furthermore, due to the use of hot gas bypass defrosting, the heat from the high-temperature refrigerant flows from the inside of the indoor heat exchangers to the outside, minimizing heat leakage to the external environment, preventing significant fluctuations in indoor temperature, and maintaining refrigeration while improving defrosting efficiency, thus optimizing the user experience.

[0047] like Figure 1 As shown, taking a refrigerator as an example, in one application example of this utility model, the refrigeration system has two indoor heat exchangers 7 / 8, namely a first indoor heat exchanger 7 and a second indoor heat exchanger 8. The first end of the first indoor heat exchanger 7 is connected in series with a first throttling element 51 and connected to a first auxiliary control valve 17. The second end of the first indoor heat exchanger 7 is provided with a first return pipe 91. The first end of the second indoor heat exchanger 8 is connected in series with a second throttling element 52 and connected to a second auxiliary control valve 18. The second end of the second indoor heat exchanger 8 is provided with a second return pipe 92. The bypass branch of the first indoor heat exchanger 7 is equipped with a first defrosting auxiliary device 111, and the bypass branch of the second indoor heat exchanger 8 is equipped with a second defrosting auxiliary device 112.

[0048] like Figure 8 As shown, the control method for the above-mentioned refrigeration system includes the following steps:

[0049] S1. Refrigerator cooling operation begins;

[0050] S2, Compressor starts;

[0051] S3, the refrigeration control valve is open, the bypass control valve is closed, the first auxiliary control valve connects the first indoor heat exchanger and the outdoor heat exchanger, and the second auxiliary control valve connects the second indoor heat exchanger and the outdoor heat exchanger. The two indoor heat exchangers are in the refrigeration state.

[0052] S4. Detect the temperature of the first indoor heat exchanger and the second indoor heat exchanger, and execute the defrosting control logic S5.10 to S.12 of the first indoor heat exchanger and the defrosting control logic S5.20 to S.22 of the second indoor heat exchanger respectively.

[0053] The defrosting control logic for the first indoor heat exchanger is as follows:

[0054] S5.10 Determine whether the temperature of the first indoor heat exchanger is less than the first set threshold. If so, the first indoor heat exchanger enters the defrost mode, the bypass control valve opens, and the first auxiliary control valve connects the first indoor heat exchanger and the exhaust side of the compressor.

[0055] S5.11. When it is necessary to heat the bypass gas, activate the first defrosting auxiliary device;

[0056] S5.12 Determine whether the temperature of the first indoor heat exchanger is greater than the third set threshold. If so, the first indoor heat exchanger exits the defrost mode and then turns on the cooling mode. The bypass control valve is closed, and the first auxiliary control valve connects the first indoor heat exchanger and the outdoor heat exchanger.

[0057] The defrosting control logic for the second indoor heat exchanger is as follows:

[0058] S5.20 Determine whether the temperature of the second indoor heat exchanger is lower than the second set threshold. If so, the second indoor heat exchanger enters the defrost mode, the bypass control valve opens, and the second auxiliary control valve connects the exhaust side of the second indoor heat exchanger and the compressor.

[0059] S5.21. When it is necessary to heat the bypass gas, activate the second defrosting auxiliary device;

[0060] S5.22 Determine whether the temperature of the second indoor heat exchanger is greater than the fourth set threshold. If so, the second indoor heat exchanger exits the defrost mode and then turns on the cooling mode. The bypass control valve is closed, and the second auxiliary control valve connects the second indoor heat exchanger and the outdoor heat exchanger.

[0061] The first set threshold is greater than the second set threshold, and the third set threshold is the same as the fourth set threshold. The purpose of this design is to control the two indoor heat exchangers to defrost at different times, so as to solve the defrosting problem while ensuring the cooling effect.

[0062] In addition, such as Figure 9As shown, when an indoor heat exchanger reaches the defrosting condition, it is determined whether another indoor heat exchanger is defrosting. If so, it waits for the evaporator that is defrosting to complete the defrosting process and exits the defrosting mode before the indoor heat exchanger enters the defrosting mode again.

[0063] It should be noted that the detection of the indoor heat exchanger in the control method can be temperature or pressure value, etc. The preset conditions for entering or exiting the defrost mode are determined by the temperature or pressure value. This utility model does not impose any special restrictions on this.

[0064] It should be noted that the terminology used above is for describing specific embodiments only and is not intended to limit the exemplary embodiments according to this utility model. When the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. The order of execution of actions, steps, etc., in the apparatus and methods shown in the specification and drawings can be implemented in any order unless a specific express order is specified, and as long as the output of the preceding process is not used in the subsequent process. Similar sequential terms used for ease of description do not imply that such an order must be followed.

[0065] Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A refrigeration system with hot gas bypass defrosting, including: The compressor, an outdoor heat exchanger, and at least two indoor heat exchangers are provided. The first end of the outdoor heat exchanger is connected to the exhaust side of the compressor. The first end of the indoor heat exchanger can be switched to be connected to either the exhaust side of the compressor or the second end of the outdoor heat exchanger. The second end of the indoor heat exchanger is connected to the intake side of the compressor. The refrigeration system is characterized in that it further includes a defrosting auxiliary device for heating the refrigerant flowing to the indoor heat exchanger.

2. The refrigeration system according to claim 1, characterized in that, The first end of the indoor heat exchanger is connected to the second end of the outdoor heat exchanger via a refrigeration branch pipe. The first end of the indoor heat exchanger is connected to the exhaust side of the compressor via a bypass branch pipe. The defrosting auxiliary device is installed on the bypass branch pipe. At most one of the refrigeration branch pipe and the bypass branch pipe of the same indoor heat exchanger can be connected.

3. The refrigeration system according to claim 2, characterized in that, The defrosting auxiliary device is a heating wire, which is wound along the length of the outer wall of the bypass branch pipe.

4. The refrigeration system according to claim 1, characterized in that, Each of the indoor heat exchangers is individually equipped with a throttling element, and the first end of the indoor heat exchanger is connected in series with the throttling element and then connected to the exhaust side of the compressor or the second end of the outdoor heat exchanger.

5. The refrigeration system according to claim 2, characterized in that, The first end of the indoor heat exchanger is equipped with a secondary control valve, which is connected to the second end of the outdoor heat exchanger via a refrigeration branch pipe. The secondary control valve is also connected to the exhaust side of the compressor via a bypass branch pipe. The secondary control valve switches between on and off states to connect the indoor heat exchanger to the exhaust side of the compressor or the second end of the outdoor heat exchanger.

6. The refrigeration system according to claim 5, characterized in that, All the refrigeration branch pipes are mounted on a refrigeration control valve, which is connected to the second end of the outdoor heat exchanger via a main pipe. All the bypass branch pipes are mounted on a bypass control valve, which is connected to the discharge side of the compressor via a main bypass pipe. The refrigeration control valve switches between on and off states to connect or disconnect the refrigeration branch pipe from the main pipe. The bypass control valve switches between on and off states to connect or disconnect the bypass branch pipe from the main bypass pipe.

7. The refrigeration system according to claim 1, characterized in that, Also includes: The receiver is connected in series between the receiver and the suction side of the compressor, with the second end of all the indoor heat exchangers connected to a manifold via a return pipe.

8. The refrigeration system according to any one of claims 1 to 6, characterized in that, Each of the indoor heat exchangers is individually equipped with a one-way valve, and the second end of the indoor heat exchanger is connected in series with the one-way valve and then connected to the suction side of the compressor.

9. A refrigeration device, characterized in that, The refrigeration equipment includes the refrigeration system according to any one of claims 1 to 8.

10. The refrigeration equipment according to claim 9, characterized in that, The refrigeration equipment is a refrigerator, the outdoor heat exchanger is a condenser, and the indoor heat exchanger is an evaporator.

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