Refrigerating system and refrigerating equipment
By connecting a bypass branch in parallel in the refrigeration cycle loop and using valve group switching, the problems of condensation and frosting on the condenser are solved, the risk of liquid slugging in the compressor is reduced, and the efficient operation of the refrigeration system is achieved.
Patent Information
- Application Number
- CN202520128401.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-01-17
AI Technical Summary
During the defrosting process of refrigeration equipment, condensation or frost may occur on the condenser, which may prevent the refrigerant from completely vaporizing, increasing the risk of liquid slugging in the compressor and affecting system energy efficiency.
A bypass branch is connected in parallel in the refrigeration cycle loop, and the throttling element or bypass branch is selectively opened through the valve group to ensure that the refrigerant flows directly to the condenser in the defrosting cycle mode, avoiding the condenser temperature from being too low and preventing condensation and frost. At the same time, the throttling element is normally opened in the refrigeration cycle mode to maintain system efficiency.
It effectively reduces the possibility of condensation and frosting on the condenser, reduces the risk of liquid slugging in the compressor, improves system energy efficiency, and saves energy.
Smart Images
Figure CN223691340U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of refrigeration, and more particularly, to a refrigeration system and a refrigeration device. BACKGROUND
[0002] In the operation process of a refrigeration device such as a refrigerator, frost will be formed on the surface of an evaporator due to low temperature, which affects the heat exchange efficiency. In order to solve this problem, the related technology adopts a heat pump defrosting mode for defrosting. The heat pump defrosting mainly utilizes a refrigeration reverse cycle, takes the evaporator as a condenser of the heat pump cycle, and makes the high-temperature gas discharged by a compressor flow to the frosted evaporator to be condensed and heat-released to be cooled, and then flows to a throttling element to be cooled, and finally flows to a condenser to exchange heat with the environment, and the evaporator absorbs heat to become gaseous refrigerant, and returns to the compressor. During normal refrigeration, the throttling element can hinder, restrict and depress the refrigerant flowing therethrough, so as to improve the heat exchange efficiency of the evaporator. However, in the heat pump defrosting cycle, the temperature of the refrigerant flowing out of the evaporator is low, and after being cooled by the throttling element, the temperature is further reduced, and after entering the condenser, the surface temperature of the condenser may be too low to cause condensation or even frost, and the refrigerant may not completely change from liquid to gas, which finally causes liquid strike to the compressor. CONTENT OF THE UTILITY MODEL
[0003] The purpose of the present application is to provide a refrigeration system and a refrigeration device, which can reduce the possibility of condensation or frost of the condenser during defrosting without affecting normal refrigeration, reduce the risk of liquid strike to the compressor, and improve the overall energy efficiency of the system.
[0004] In a first aspect, the present application provides a refrigeration system, comprising: a refrigeration assembly comprising a compressor, a condenser, a throttling element and an evaporator; a refrigeration cycle circuit comprising a main pipeline and a bypass branch connected with the main pipeline, the compressor, the condenser, the throttling element and the evaporator being sequentially arranged in the main pipeline, and two ends of the bypass branch being correspondingly connected with two ends of the throttling element; a reversing valve connected with the compressor, the condenser and the evaporator through pipelines, the reversing valve being configured to adjust the flow direction of the refrigerant in the refrigeration cycle circuit, so as to switch the refrigeration system between a refrigeration cycle mode and a defrosting cycle mode; and a valve group arranged in the refrigeration cycle circuit, the valve group being configured to selectively open the pipeline or the bypass branch in which the throttling element is arranged according to the operation mode.
[0005] According to the refrigeration system provided in the embodiments of the present application, a bypass branch is connected in parallel with the throttling element, and a valve group is arranged in the refrigeration cycle circuit. The valve group can selectively conduct the pipeline in which the throttling element is arranged or the bypass branch according to the operation mode. In the refrigeration cycle mode, the valve group can conduct the pipeline in which the throttling element is arranged without affecting normal refrigeration. In the defrosting cycle mode, the valve group can conduct the bypass branch, and the refrigerant flowing out of the evaporator directly flows to the condenser through the bypass branch, which can reduce the possibility of condensation or even frosting on the surface of the condenser, and can also make the liquid refrigerant fully evaporate in the condenser, thereby reducing the risk of liquid knock in the compressor.
[0006] In addition, the refrigeration system according to the present application can also have the following additional technical features:
[0007] In some embodiments of the present application, the valve group includes a first valve body and a second valve body. The first valve body is arranged in the bypass branch, and the second valve body is arranged at one end of the throttling element and is arranged in parallel with the first valve body.
[0008] In some embodiments of the present application, the valve group is an electromagnetic valve, and the electromagnetic valve includes a first inlet, a first outlet and a second outlet. The first inlet is connected with the throttling element, the first outlet is connected with the bypass branch, and the second outlet is connected with the evaporator.
[0009] In some embodiments of the present application, the refrigeration system further includes a heat exchange chamber and a temperature sensor. The compressor and the condenser are arranged in the heat exchange chamber, and the temperature sensor is used to detect the temperature in the heat exchange chamber. The valve group is configured to selectively conduct the bypass branch or the pipeline in which the throttling element is arranged according to the operation mode and the temperature in the heat exchange chamber.
[0010] In some embodiments of the present application, the compressor includes a shell having an inner cavity, a silencer, a cylinder and a high-pressure cabin chamber arranged in the inner cavity and in communication with each other. The shell is provided with a plurality of back gas pipes, exhaust pipes and process pipes which are distributed at intervals. The back gas pipes are in communication with the cavity of the silencer, the exhaust pipes are in communication with the high-pressure cabin chamber, and the process pipes are in communication with the inner cavity. The refrigeration system further includes a third valve body. The third valve body includes a second inlet, a third outlet and a fourth outlet. The second inlet is connected with the reversing valve, the third outlet is connected with the back gas pipe, and the fourth outlet is connected with the process pipe. In the defrosting cycle mode, the third valve body is configured to conduct the second inlet and the fourth outlet, so that the high-temperature refrigerant discharged from the exhaust pipe of the compressor defrosts the evaporator. The defrosted refrigerant flows through the condenser and the process pipe into the inner cavity of the compressor, and preheats the refrigerant.
[0011] In some embodiments of the present application, the silencer is provided with an air inlet, the high-pressure cabin chamber is provided with an exhaust port, one end of the back gas pipe extending into the inner cavity is arranged opposite to and spaced apart from the air inlet, one end of the exhaust pipe extending into the inner cavity is connected with the exhaust port through a pipeline, and one end of the process pipe extending into the inner cavity is spaced apart from the air inlet by a preset distance.
[0012] In some embodiments of the present application, the shell comprises a lower shell and an upper shell covering the lower shell, the gas return pipe, the exhaust pipe and the process pipe are arranged in the lower shell, and the gas return pipe and the exhaust pipe are arranged adjacently.
[0013] In some embodiments of the present application, the refrigeration system further comprises a heater arranged on the process pipe.
[0014] In some embodiments of the present application, in the refrigeration cycle mode, the third valve body is further configured to connect the second inlet and the third outlet, so that the high-temperature refrigerant discharged from the exhaust pipe of the compressor flows through the condenser, the throttling element and the evaporator in sequence, and returns to the gas return pipe of the compressor.
[0015] In the second aspect, the present application provides a refrigeration device comprising the refrigeration system of any of the embodiments of the present application.
[0016] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be implemented more clearly, in accordance with the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS
[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limitations. Moreover, throughout the drawings, like reference numerals refer to same or similar components. Among them:
[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limitations. Moreover, throughout the drawings, like reference numerals refer to same or similar components. Among them:
[0019] Figure 1 The structure schematic diagram of the refrigeration system of an embodiment of the present application is shown in the figure;
[0020] Figure 2 The structure schematic diagram of the refrigeration system of another embodiment of the present application is shown in the figure;
[0021] Figure 3 The structure schematic diagram of the refrigeration system of another embodiment of the present application is shown in the figure;
[0022] Figure 4 The structure schematic diagram of the refrigeration system of another embodiment of the present application is shown in the figure; Figure 3 The structure schematic diagram of the compressor in the refrigeration system shown in the figure is shown in the figure;
[0023] Figure 5 For Figure 4 Structure diagram of the compressor omitting the upper housing.
[0024] The reference signs in the drawings represent the following:
[0025] 10. Refrigeration system;
[0026] 1. Refrigeration assembly; 11. Compressor; 110. Housing; 110a. Upper housing; 110b. Lower housing; 111. Suction pipe; 112. Discharge pipe; 113. Process pipe; 114. High-pressure chamber; 115. Inner cavity; 116. Silencer; 117. Cylinder; 118. Suction port;
[0027] 12. Condenser; 13. Evaporator; 14. Throttling element; 15. Filter;
[0028] 2. Directional valve; 21. First valve port; 22. Second valve port; 23. Third valve port; 24. Fourth valve port;
[0029] 3. Refrigeration cycle circuit; 31. Main pipe; 32. Bypass branch;
[0030] 4. Valve group; 41. First inlet; 42. First outlet; 43. Second outlet; 401. First valve body; 402. Second valve body; 403. Third valve body; 44. Second inlet; 45. Third outlet; 46. Fourth outlet;
[0031] 5. Heater. DETAILED DESCRIPTION
[0032] Exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms without being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
[0033] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.
[0034] Although the terms first, second, third, and the like can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
[0035] Spatially relative terms, such as "inner", "outer", "inwardly", "outwardly", "lower", "bottom", "top", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Such spatially relative terms can encompass different orientations of the device in use or operation, depending on the particular viewpoint. For example, if the device depicted in the figures is turned over, elements described as "below" or "under" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
[0036] Figure 1 Structure schematic diagram of the refrigeration system of an embodiment of the present application.
[0037] Referring to Figure 1 An embodiment of the present application provides a refrigeration system 10, comprising: a refrigeration assembly 1, a reversing valve 2, a refrigeration cycle circuit 3, and a valve group 4.
[0038] The refrigeration assembly 1 comprises a compressor 11, a condenser 12, a throttling element 14 and an evaporator 13. The throttling element 14 can be, for example but not limited to, a capillary tube, for obstructing, throttling, depressurizing the refrigerant flowing therethrough, and improving the heat exchange efficiency of the evaporator 13 or the condenser 12.
[0039] The refrigeration cycle circuit 3 comprises a main pipeline 31 and a bypass branch 32 in communication with the main pipeline 31, the compressor 11, the condenser 12, the throttling element 14 and the evaporator 13 are sequentially arranged in the main pipeline 31, and the two ends of the bypass branch 32 are connected to the two ends of the throttling element 14 correspondingly.
[0040] The reversing valve 2 is connected to the compressor 11, the condenser 12 and the evaporator 13 through pipelines respectively, and is configured to adjust the flow direction of the refrigerant in the refrigeration cycle circuit 3, so as to switch the refrigeration system 10 between the refrigeration cycle mode and the defrosting cycle mode.
[0041] The valve group 4 is arranged in the refrigeration cycle circuit, and is configured to selectively conduct the pipeline where the throttling element 14 is arranged or the bypass branch 32 according to the operation mode.
[0042] In the embodiment, the compressor 11 comprises an exhaust pipe 112 and a return pipe 111, the reversing valve 2 comprises a first valve port 21, a second valve port 22, a third valve port 23 and a fourth valve port 24, the first valve port 21 is in communication with the exhaust pipe 112 of the compressor 11, the second valve port 22 is in communication with the return pipe 111 of the compressor 11, the third valve port 23 is in communication with the inlet of the condenser 12, and the fourth valve port 24 is in communication with the outlet of the evaporator 13, wherein in the refrigeration cycle mode, the first valve port 21 can be conducted with the third valve port 23, and the second valve port 22 is conducted with the fourth valve port 24; in the defrosting cycle mode, the first valve port 21 can be conducted with the fourth valve port 24, and the second valve port 22 is conducted with the third valve port 23. Thus, the reversing valve 2 has two working states: when the reversing valve 2 is powered off, the refrigeration system 10 normally operates to enter the refrigeration cycle mode, at this time the refrigerant flows in the refrigeration cycle circuit 3 in a first direction through the reversing valve 2; when the reversing valve 2 is powered on, the refrigeration system 10 enters the defrosting cycle mode, at this time the refrigerant flows in the refrigeration cycle circuit 3 in a second direction through the reversing valve 2, the second direction is opposite to the first direction.
[0043] When the refrigeration system 10 enters the defrosting cycle mode, the high-temperature and high-pressure refrigerant discharged from the exhaust pipe 112 of the compressor 11 enters the evaporator 13 and the condenser 12 in sequence through the reversing valve 2, directly defrosts the evaporator 13 by using the high-temperature and high-pressure refrigerant, fully utilizes the heat of the compressor 11, reduces energy waste, and has low power of the compressor 11, thereby achieving the effect of energy saving. When defrosting, the evaporator 13 is in a low-temperature state, and the gaseous refrigerant will significantly decrease in temperature after flowing through the evaporator 13. After throttling and temperature reduction by the throttling element 14, the temperature of the refrigerant is further reduced, and after entering the condenser 12, the surface temperature of the condenser 12 may be too low to cause condensation or even frosting, and the refrigerant may also not completely change from liquid state to gaseous state. If the liquid refrigerant flows back to the gas return pipe 111 of the compressor 11, liquid hammer may be caused to damage the compressor 11.
[0044] To this end, in the embodiment, a bypass branch 32 is connected in parallel at the throttling element 14 between the condenser 12 and the evaporator 13, and a valve group 4 is arranged in the refrigeration cycle circuit 3. The valve group 4 can selectively conduct the throttling element 14 or the bypass branch 32 according to the operation mode. In the refrigeration cycle mode, the valve group 4 conducts the throttling element 14, and the high-temperature and high-pressure refrigerant discharged from the exhaust pipe 112 of the compressor 11 flows through the condenser 12, the throttling element 14 and the evaporator 13 in sequence, and finally returns to the gas return pipe 111 of the compressor 11, without affecting the normal operation of the refrigeration system 10.
[0045] In the defrosting cycle mode, the valve group 4 conducts the bypass branch 32, and the high-temperature and high-pressure refrigerant discharged from the exhaust pipe 112 of the compressor 11 flows through the evaporator 13, and then condenses and releases heat to melt the frost layer on the surface of the evaporator 13. The low-temperature refrigerant flowing out of the evaporator 13 directly flows to the condenser 12 through the bypass branch 32 connected in parallel with the throttling element 14. At this time, the low-temperature refrigerant exchanges heat with the environment outside the bypass branch 32, so that the temperature of the liquid refrigerant entering the condenser 12 slightly rises, and then becomes gaseous refrigerant after fully exchanging heat with the surrounding environment, thereby avoiding the waste of heat caused by throttling and temperature reduction by the throttling element 14 again, avoiding condensation or even frosting on the surface of the condenser 12, and preventing liquid hammer of the compressor 11.
[0046] According to the refrigeration system 10 provided in the embodiments of this application, a bypass branch 32 is connected in parallel at the throttling element 14 between the condenser 12 and the evaporator 13, and a valve group 4 is provided in the refrigeration cycle loop 3. The valve group 4 can selectively open the throttling element 14 or the bypass branch 32 according to the operating mode. In the refrigeration cycle mode, the valve group 4 can open the pipeline where the throttling element 14 is located without affecting normal refrigeration; while in the defrosting cycle mode, the valve group 4 opens the bypass branch 32, and the refrigerant flowing out of the evaporator 13 flows directly to the condenser 12 through the bypass branch 32, which reduces the possibility of condensation or even frost on the surface of the condenser 12, and allows the liquid refrigerant to fully evaporate in the condenser 12, reducing the risk of liquid slugging in the compressor 11.
[0047] In some embodiments, the valve assembly 4 includes a first valve body 401 and a second valve body 402. The first valve body 401 is disposed in the bypass branch 32, and the second valve body 402 is disposed at one end of the throttling element 14 and is connected in parallel with the first valve body 401.
[0048] In one example, such as Figure 1 As shown, both the first valve body 401 and the second valve body 402 are one-way check valves with opposite flow directions, so that the refrigerant flows in a predetermined direction when switching between the refrigeration cycle mode and the defrost cycle mode, preventing refrigerant backflow. Specifically, the first valve body 401 is disposed on the bypass branch 32, and the second valve body 402 is disposed at one end of the throttling element 14. In the defrost cycle mode, the first valve body 401 opens the bypass branch 32, so that the refrigerant flows from the evaporator 13 to the condenser 12; in the refrigeration cycle mode, the second valve body 402 opens the throttling element 14, so that the refrigerant flows from the condenser 12 to the throttling element 14 and then to the evaporator 13.
[0049] In other examples, the first valve body 401 and the second valve body 402 may also be other types of valve bodies, such as, but not limited to, a two-way solenoid valve with one inlet and one outlet, which is not limited here.
[0050] Figure 2 This is a schematic diagram of the structure of a refrigeration system according to another embodiment of this application.
[0051] In some embodiments, valve assembly 4 is a solenoid valve, which includes a first inlet 41, a first outlet 42, and a second outlet 43. The first inlet 41 is connected to the throttling element 14, the first outlet 42 is connected to the bypass branch 32, and the second outlet 43 is connected to the evaporator 13.
[0052] In this embodiment, as Figure 2As shown, the valve group 4 can be a three-way electromagnetic valve, which includes a first inlet 41, a first outlet 42 and a second outlet 43. The first inlet 41 is connected with the throttling element 14, the first outlet 42 is connected with the bypass branch 32, and the second outlet 43 is connected with the evaporator 13. In the defrosting cycle mode, the first outlet 42 and the second outlet 43 are communicated, and the bypass branch 32 can be conducted to make the refrigerant flow from the evaporator 13 to the condenser 12; in the refrigeration cycle mode, the first inlet 41 is communicated with the second outlet 43, and the throttling element 14 can be conducted to make the refrigerant flow from the condenser 12 to the throttling element 14 and the evaporator 13 in turn.
[0053] In some embodiments, the refrigeration system 10 further includes a heat exchange chamber and a temperature sensor. The compressor 11 and the condenser 12 are arranged in the heat exchange chamber, and the temperature sensor is used to detect the temperature in the heat exchange chamber. The valve group 4 is configured to selectively conduct the bypass branch 32 or the pipeline in which the throttling element 14 is arranged according to the operating mode and the temperature in the heat exchange chamber.
[0054] Taking the refrigerator as an example, for the built-in refrigerator, the temperature in the heat exchange chamber is high during refrigeration operation due to the narrow and closed environment, and needs to be cooled in time. Therefore, in this embodiment, a temperature sensor is arranged in the heat exchange chamber to detect the temperature in the heat exchange chamber. In the defrosting cycle mode, if the temperature in the heat exchange chamber is less than a temperature threshold T, the valve group 4 conducts the bypass branch 32 to make the refrigerant flow from the evaporator 13 to the condenser 12; if the temperature in the heat exchange chamber is greater than or equal to the temperature threshold T, the valve group 4 conducts the throttling element to make the refrigerant flow from the condenser 12 to the throttling element 14 and the evaporator 13 in turn. At this time, the refrigerant with lower temperature is cooled by the throttling element 14, and absorbs the heat of the surrounding environment in the condenser 12, thereby reducing the surrounding heat load of the built-in refrigerator. The temperature threshold T can be assigned according to the use environment of different products. In the refrigeration cycle mode, the valve group 4 conducts the throttling element 14 for normal refrigeration.
[0055] It can be understood that the valve group 4 in this embodiment can be a three-way electromagnetic valve, or a combination of the first valve body 401 and the second valve body 402, and the first valve body 401 and the second valve body 402 are both two-way electromagnetic valves.
[0056] Figure 3 FIG. 2 is a structural schematic diagram of a refrigeration system according to another embodiment of the present application, Figure 4 FIG. 3 is a structural schematic diagram of a refrigeration system according to another embodiment of the present application, Figure 3 FIG. 4 is a structural schematic diagram of a compressor in the refrigeration system shown in FIG. 3.
[0057] In some embodiments, the compressor 11 comprises a shell 110 having an inner cavity 115, and a muffler 116, a cylinder 117 and a high-pressure cabin 114 arranged in the inner cavity 115 and in communication with each other, the shell 110 is provided with a plurality of return gas pipes 111, exhaust pipes 112 and process pipes 113 arranged at intervals, the return gas pipes 111 are in communication with the cavity of the muffler 116, the exhaust pipes 112 are in communication with the high-pressure cabin 114, and the process pipes 113 are in communication with the inner cavity 115; the refrigeration system 10 further comprises a third valve body 403, the third valve body 403 comprises a second inlet 44, a third outlet 45 and a fourth outlet 46, the second inlet 44 is connected with the reversing valve 2, the third outlet 45 is connected with the return gas pipe 111, and the fourth outlet 46 is connected with the process pipe 113, in the defrosting cycle mode, the third valve body 403 is configured to conduct the second inlet 44 and the fourth outlet 46, so that the high-temperature refrigerant discharged from the exhaust pipe 112 of the compressor 11 defrosts the evaporator 13, and the defrosted refrigerant flows through the condenser 12 and the process pipe 113 into the inner cavity 115 of the compressor 11, and preheats the refrigerant.
[0058] As shown in Figure 3 and Figure 4 , in the present embodiment, the compressor 11 is the heart of the refrigeration system 10, and its main function is to compress the low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant. The compressor 11 can be a piston compressor, which comprises a muffler 116, a cylinder 117 and a high-pressure cabin 114 arranged in the inner cavity 115 of the shell 110, the muffler 116 is used to reduce the aerodynamic noise generated by the gas entering the compressor 11, the cylinder 117 is provided with a piston, a suction valve, an exhaust valve, a crankshaft component and the like, the mechanical work of the piston is converted into heat energy to compress the low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant and send it into the high-pressure cabin 114, and the high-pressure cabin 114 is used to reduce the aerodynamic noise generated by the compressed gas. In the refrigeration cycle mode, the exhaust pipe 112 of the compressor 11 is used to discharge the compressed high-temperature and high-pressure gaseous refrigerant from the compressor 11; the return gas pipe 111 is used to return the refrigerant after the evaporator 13 to the compressor 11; and the process pipe 113 is generally used for debugging and maintenance of the refrigeration system 10, such as filling refrigerant, vacuumizing or detecting system pressure in the inner cavity 115. In the defrosting cycle mode, the functions of the process pipe 113 and the return gas pipe 111 can be exchanged, that is, the low-temperature refrigerant after the evaporator 13 returns to the inner cavity 115 of the compressor 11 through the process pipe 113, and the return gas pipe 111 is used for debugging and maintenance of the refrigeration system 10 and the like.
[0059] Specifically, when the refrigeration system 10 enters the defrosting cycle mode, the valve group 4 can include a first valve body 401 and a second valve body 402, and the valve group 4 can also be a three-way electromagnetic valve. The high-temperature and high-pressure refrigerant discharged from the exhaust pipe 112 of the compressor 11 enters the evaporator 13, the bypass branch 32 and the condenser 12 in turn through the reversing valve 2, and the high-temperature and high-pressure refrigerant is used to directly defrost the evaporator 13. The heat of the compressor 11 is fully utilized, energy waste is reduced, the power of the compressor 11 is low, and the effect of energy saving is achieved. When defrosting, the evaporator 13 is in a low-temperature state, and the gaseous refrigerant will have a significant temperature drop after flowing through the evaporator 13 and the condenser 12, which may produce part of the liquid refrigerant. If the liquid refrigerant flows back to the gas return pipe 111 of the compressor 11, it may cause liquid strike and damage the compressor 11.
[0060] To this end, in the present embodiment, the gas return pipe of the refrigeration cycle circuit 3 is connected with the process pipe 113 of the compressor 11. When the refrigeration system 10 enters the heat pump defrosting cycle mode, the third valve body 403 closes the third outlet 45, opens the second inlet 44 and the fourth outlet 46, so that the high-temperature refrigerant discharged from the exhaust pipe 112 of the compressor 11 defrosts the evaporator 13. After the defrosting, the refrigerant flows through the condenser 12 and then enters the inner cavity 115 of the compressor 11 through the process pipe 113. Since the compressor 11 converts mechanical energy into heat energy by doing work in the process of compressing low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant, the heat of the inner cavity 115 of the compressor 11 is high. The waste heat of the inner cavity 115 of the compressor 11 can be used to preheat the refrigerant, and the warmed refrigerant entering the sound attenuation chamber 114 helps to maintain the uniform distribution of the internal temperature of the compressor 11 and reduces the risk of local overheating. In the process of preheating the refrigerant, the liquid refrigerant can also be completely evaporated into gaseous refrigerant, thereby reducing the possibility of liquid strike of the compressor 11 and improving the service life of the compressor 11.
[0061] Optionally, the refrigeration system also includes a sensor assembly and a controller. The sensor assembly is used to detect the upper and lower surface temperatures of the evaporator 13, and the controller is electrically connected to the sensor assembly, the third valve body 403, the valve group 4, and the reversing valve 2. The lower surface of the evaporator 13 refers to the side of the evaporator 13 closest to the ground, and the upper surface of the evaporator 13 refers to the side of the evaporator 13 furthest from the ground. The sensor assembly may include a first sensor and a second sensor. The first sensor is used to detect the upper surface temperature of the evaporator 13, and the second sensor is used to detect the lower surface temperature of the evaporator 13. If the upper surface temperature of the evaporator 13 is less than or equal to a first temperature threshold T1, it indicates that the upper surface of the evaporator 13 needs defrosting; or if the lower surface temperature of the evaporator 13 is less than or equal to a second temperature threshold T2, it indicates that the lower surface of the evaporator 13 needs defrosting. The first temperature threshold T1 and the second temperature threshold T2 need to be assigned values according to different products and different operating environments, and are generally higher than 0°C. For example, the first temperature threshold T1 can be the dew point temperature, which depends on the external environment. For example, when the ambient temperature is 23℃, the first temperature threshold T1 can be 2℃~4℃, and the second temperature threshold T2 can be 0~2℃.
[0062] In defrosting cycle mode, the controller controls the third valve body 403 to close the third outlet 45 and open the second inlet 44 and the fourth outlet 46 based on the upper surface temperature of the evaporator 13 being less than or equal to the first temperature threshold T1, or based on the lower surface temperature of the evaporator 13 being less than or equal to the second temperature threshold T2, so that the high-temperature refrigerant discharged from the exhaust pipe 112 of the compressor 11 defrosts the evaporator 13. The defrosted refrigerant flows through the condenser 12 and the process pipe 113 into the inner cavity of the compressor 11 and preheats the refrigerant.
[0063] In some embodiments, the housing 110 includes a lower housing 110b and an upper housing 110a covering the lower housing 110b. A return pipe 111, an exhaust pipe 112, and a process pipe 113 are respectively disposed in the lower housing 110b, and the return pipe 111 and the exhaust pipe 112 are disposed adjacent to each other.
[0064] like Figure 4 As shown, the return pipe 111, exhaust pipe 112, and process pipe 113 are respectively located in the lower housing 110b, facilitating the assembly and disassembly of the compressor 11. The return pipe 111 is generally used to connect to the evaporator 13, and the exhaust pipe 112 is generally used to connect to the condenser 12. The return pipe 111 and exhaust pipe 112 are arranged adjacent to each other in the lower housing 110b, allowing the pipes to be installed from the same side, reducing the space occupied by the pipes. Optionally, the return pipe 111, exhaust pipe 112, and process pipe 113 can all be copper pipes, which have good thermal conductivity and corrosion resistance.
[0065] Figure 5 for Figure 4The diagram shown is a structural schematic of the compressor with the upper casing omitted.
[0066] In some embodiments, the silencer 116 is provided with an air intake 118, the high-pressure chamber 114 is provided with an exhaust port, one end of the return air pipe 111 extends into the inner cavity 115 and is opposite to and spaced apart from the air intake 118, one end of the exhaust pipe 112 extends into the inner cavity 115 and is connected to the exhaust port through a pipeline, and one end of the process pipe 113 extends into the inner cavity 115 and is spaced apart from the air intake 118 by a predetermined distance.
[0067] like Figure 5 As shown, in the defrost cycle mode, since the end of the process pipe 113 extending into the inner cavity 115 is separated from the intake port 118 by a preset distance, the refrigerant enters the inner cavity 115 of the compressor 11 from the process pipe 113 and then flows in two streams within the inner cavity 115. After the refrigerant exchanges heat with the residual heat of the inner cavity 115, the two streams converge at the intake port 118 and enter the chamber of the muffler 116. Then, they enter the cylinder 117 through the intake valve plate and are compressed by the piston. The compressed refrigerant enters the high-pressure chamber 114 through the exhaust valve plate and is then discharged from the exhaust pipe 112 through the exhaust port to start the next defrost cycle.
[0068] In some embodiments, the refrigeration system 10 further includes a heater 5 disposed on the process tube 113.
[0069] like Figure 3 As shown, heater 5 is installed on process tube 113. Heater 5 is used to assist in heating the refrigerant in process tube 113. The sensor assembly may also include a third sensor, which is used to detect the temperature of the refrigerant flowing into process tube 113. If the refrigerant temperature is lower than a third temperature threshold T3, which can be, for example, -10℃, the controller controls heater 5 to turn on. Heater 5 provides additional heat to ensure that the temperature of the refrigerant is not too low before it returns to the inner cavity 115 of compressor 11, thus preventing condensation and frost on the surface of compressor 11. This helps maintain the gaseous state of the refrigerant, prevents liquid slugging caused by the liquefaction of gaseous refrigerant, and ensures the safe and stable operation of compressor 11.
[0070] In some embodiments, in the refrigeration cycle mode, the third valve body 403 is further configured to open the second inlet 44 and the third outlet 45 so that the refrigerant discharged from the exhaust pipe 112 of the compressor 11 flows sequentially through the condenser 12, the throttling element 14 and the evaporator 13, and returns to the return pipe 111 of the compressor 11.
[0071] like Figure 1As shown, when the reversing valve 2 is powered off, the refrigeration system 10 normally operates in the refrigeration cycle mode. In the refrigeration cycle mode, the controller can control the third valve body 403 to close the fourth outlet 46 and open the second inlet 44 and the third outlet 45. The high-temperature refrigerant discharged from the exhaust pipe 112 of the compressor 11 flows through the condenser 12, the throttling element 14, and the evaporator 13 in sequence, and then flows back to the gas return pipe 111 of the compressor 11, which is opposite to the suction port 118 of the muffler and is spaced apart from the suction port 118. The return gas refrigerant is sucked into the chamber of the muffler 116 through the suction port 118, enters the cylinder 117 through the suction valve plate for compression, and then enters the high-pressure chamber 114 through the exhaust valve plate. The compressed refrigerant is then discharged from the exhaust port and the exhaust pipe 112 through the pipeline, and the next refrigeration cycle is performed.
[0072] In some embodiments, the refrigeration assembly 1 further comprises a filter 15 disposed in the main pipeline 31 and located between the condenser 12 and the throttling element 14. Optionally, the filter 15 is a drying filter, which can filter impurities in the refrigerant before entering the throttling element 14, and can also dry the low-temperature and low-pressure refrigerant flowing through the condenser 12, thereby improving the evaporation efficiency of the evaporator 13.
[0073] In some embodiments, the controller is also electrically connected to the compressor 11, and in the defrosting cycle mode, the controller is configured to adjust the rotation speed of the compressor 11 according to the temperature of the upper surface of the evaporator 13 or the temperature of the lower surface of the evaporator 13.
[0074] As described above, if the temperature of the upper surface of the evaporator 13 is less than or equal to the first temperature threshold T1, or the temperature of the lower surface of the evaporator 13 is less than or equal to the second temperature threshold T2, the frost and ice on the upper surface or the lower surface of the evaporator 13 need to be defrosted, and the rotation speed of the compressor 11 can be relatively high to improve the defrosting efficiency. If the temperature of the upper surface of the evaporator 13 is greater than the first temperature threshold T1, it indicates that the frost and ice on the upper surface of the evaporator 13 have been defrosted, and the heat required for defrosting has been reduced, so the rotation speed of the compressor 11 can be reduced; or if the temperature of the lower surface of the evaporator 13 is greater than the second temperature threshold T2, it indicates that the frost and ice on the lower surface of the evaporator 13 have been defrosted, and the frost and ice on the surface of the evaporator have all fallen into the water pan, so the exhaust defrosting can be stopped and the rotation speed of the compressor 11 can be reduced.
[0075] In some embodiments, in defrosting cycle mode, if the temperature of the upper surface of the evaporator 13 is greater than a first temperature threshold, the controller is further configured to control the speed of the compressor 11 to a first speed R1; if the temperature of the upper surface of the evaporator 13 is less than or equal to the first temperature threshold, the controller is further configured to control the speed of the compressor 11 to a second speed R2, the second speed R2 being greater than the first speed R1; the controller is further configured to control the speed of the compressor 11 to the first speed R1 if the temperature of the lower surface of the evaporator 13 is less than or equal to the second temperature threshold.
[0076] like Figures 1 to 3 As shown, in defrost cycle mode, when the temperature of the upper surface of the evaporator 13 is less than or equal to the first temperature threshold T1, the compressor 11 operates at a higher second speed R2 to maintain a higher temperature of the high-temperature, high-pressure gaseous refrigerant discharged by the compressor. This heats the internal piping of the evaporator 13, controlling the compressor 11 to maintain appropriate power and achieving energy-saving effects. The gaseous refrigerant discharged by the compressor 11 flows through the internal piping of the evaporator 13, causing the surface of the evaporator 13 to defrost evenly. Furthermore, the speed of the compressor 11 can be gradually reduced depending on the defrosting duration. When the temperature of the upper surface of the evaporator 13 is greater than the first temperature threshold T1, or when the temperature of the lower surface of the evaporator 13 is less than or equal to the second temperature threshold T2, the compressor 11 operates at a lower first speed R1. The first speed R1 and the second speed R2 are different speed settings of the compressor 11, determined according to specific application scenarios and usage requirements, and will not be elaborated further.
[0077] It is understood that the first temperature threshold T1, the second temperature threshold T2, the third temperature threshold T3, and the fourth temperature threshold T4 in the various embodiments of this application are not fixed values and need to be adjusted adaptively according to different products and usage environments, which will not be elaborated further.
[0078] In addition, this application proposes a refrigeration device, including the refrigeration system 10 of various embodiments of this application. The refrigeration device can be, for example, but not limited to, a refrigerator, freezer, cold storage, etc., and can be placed in a large space or embedded in a small, narrow space.
[0079] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A refrigeration system characterized by, The refrigeration system comprises: a refrigeration assembly comprising a compressor, a condenser, a throttling element and an evaporator; a refrigeration cycle circuit comprising a main pipeline and a bypass branch connected with the main pipeline, the compressor, the condenser, the throttling element and the evaporator being sequentially arranged in the main pipeline, and two ends of the bypass branch being correspondingly connected with two ends of the throttling element; a reversing valve connected with the compressor, the condenser and the evaporator through pipelines, the reversing valve being configured to adjust the flow direction of refrigerant in the refrigeration cycle circuit, so that the refrigeration system is switched between a refrigeration cycle mode and a defrost cycle mode; and a valve group arranged in the refrigeration cycle circuit, the valve group being configured to selectively open the pipeline where the throttling element is arranged or the bypass branch according to the operation mode. The valve group comprises a first valve body arranged in the bypass branch and a second valve body arranged at one end of the throttling element and connected with the first valve body in parallel.
2. The refrigeration system of claim 1, wherein, The valve group is an electromagnetic valve, which comprises a first inlet connected with the throttling element, a first outlet connected with the bypass branch and a second outlet connected with the evaporator.
3. The refrigeration system of claim 1, wherein, The refrigeration system further comprises a heat exchange chamber and a temperature sensor, the compressor and the condenser are arranged in the heat exchange chamber, and the temperature sensor is used to detect the temperature in the heat exchange chamber; the valve group is configured to selectively open the bypass branch or the throttling element according to the operation mode and the temperature in the heat exchange chamber.
4. The refrigeration system of any of claims 1 to 3, wherein, The compressor comprises a shell having an inner cavity, a silencer, a cylinder and a high-pressure cabin arranged in the inner cavity and connected with each other, and a plurality of return gas pipes, exhaust pipes and process pipes arranged on the shell in a spaced manner, the return gas pipes being connected with the cavities of the silencer, the exhaust pipes being connected with the high-pressure cabin, and the process pipes being connected with the inner cavity; 5. The refrigeration system of any of claims 1 to 3, wherein, The refrigeration system further comprises a third valve body comprising a second inlet connected with the reversing valve, a third outlet connected with the return gas pipe and a fourth outlet connected with the process pipe, in the defrost cycle mode, the third valve body is configured to open the second inlet and the fourth outlet, so that the refrigerant discharged from the exhaust pipe of the compressor defrosts the evaporator, the defrosted refrigerant flows through the condenser and the process pipe into the inner cavity of the compressor, and the refrigerant is preheated. The silencer is provided with an air inlet, the high-pressure cabin is provided with an exhaust port, one end of the return gas pipe extending into the inner cavity is arranged opposite to and spaced from the air inlet, one end of the exhaust pipe extending into the inner cavity is connected with the exhaust port through a pipeline, and one end of the process pipe extending into the inner cavity is spaced from the air inlet by a preset distance.
6. The refrigeration system of claim 5, wherein, The shell comprises a lower shell and an upper shell covering the lower shell, the return gas pipes, the exhaust pipes and the process pipes are arranged in the lower shell, and the return gas pipes and the exhaust pipes are arranged adjacent to each other.
7. The refrigeration system of claim 5, wherein, 8. The refrigeration system of claim 5, wherein, The refrigeration system further comprises a heater arranged on the process pipe.
9. The refrigeration system of claim 5, wherein, In the refrigeration cycle mode, the third valve body is further configured to connect the second inlet and the third outlet, so that the refrigerant discharged from the discharge pipe of the compressor sequentially flows through the condenser, the throttling element and the evaporator, and returns to the gas return pipe of the compressor.
10. A refrigeration appliance characterized in that, A refrigeration system comprising any of the features of claims 1-9.