Refrigerating system and refrigerating equipment
By setting a bypass branch and process pipe in the refrigeration cycle loop, the waste heat inside the compressor cavity is used to preheat the refrigerant after defrosting, which solves the problem of reduced heat exchange efficiency and liquid slugging caused by evaporator frosting, thus achieving energy saving and safe operation of the compressor.
Patent Information
- Application Number
- CN202520128385.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2035-01-17
AI Technical Summary
During the operation of refrigeration equipment, frost formation on the evaporator reduces heat exchange efficiency, and the backflow of liquid refrigerant to the compressor during defrosting may cause liquid slugging and damage the compressor.
By setting up a bypass branch and a process pipe in the refrigeration cycle loop, the bypass branch and process pipe are selectively opened by the valve group, so that the refrigerant in the compressor discharge pipe defrosts the evaporator, and the defrosted refrigerant enters the compressor cavity through the process pipe for preheating. The residual heat in the compressor cavity is used to evaporate the liquid refrigerant, thus avoiding liquid slugging.
It improves the utilization rate of internal heat in the compressor, reduces energy waste, lowers the risk of liquid slugging, maintains a uniform temperature distribution inside the compressor, and improves system energy efficiency.
Smart Images
Figure CN223678012U_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] During the operation of a refrigeration device such as a refrigerator, frost will form on the surface of the evaporator due to low temperature, which affects the heat exchange efficiency. In order to solve this problem, the related technology uses a heat pump defrosting system to defrost the evaporator by the exhaust temperature of the compressor, thereby avoiding waste of heat. However, in actual operation, the evaporator is in a low temperature state during defrosting, and the gaseous refrigerant may have a significant temperature drop after flowing through the evaporator, resulting in a portion of liquid refrigerant. If the liquid refrigerant flows back to the compressor, liquid knock problem may be caused, thereby damaging the compressor. CONTENT OF THE INVENTION
[0003] The purpose of the present application is to provide a refrigeration system and a refrigeration device, which can improve the utilization rate of heat inside the compressor, reduce energy waste, and help maintain uniform distribution of the temperature inside the compressor, reduce the risk of local overheating and liquid knock, 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, the compressor comprising a shell having an inner cavity, and a silencer, a cylinder and a high-pressure cabin room arranged in the inner cavity and in communication with each other, the shell being provided with a plurality of return gas pipes, exhaust pipes and process pipes distributed at intervals, the return gas pipes being in communication with the cavities of the silencers, the exhaust pipes being in communication with the high-pressure cabin rooms, and the process pipes being in communication with the inner cavities; a refrigeration cycle circuit comprising a main pipeline and a bypass branch in communication with the main pipeline, the compressor, the condenser, the throttling element and the evaporator being arranged in the main pipeline in sequence, the bypass branch being connected between the exhaust pipe of the compressor and the inlet of the evaporator; and a valve group configured to selectively conduct the bypass branch and the pipeline where the process pipes are located, while cutting off part of the main pipeline where the condenser is located and the pipeline where the return gas pipes are located, so that the refrigerant discharged from the exhaust pipe of the compressor defrosts the evaporator, and the defrosted refrigerant enters the inner cavity of the compressor through the process pipes and preheats the refrigerant.
[0005] According to the refrigeration system provided in the embodiments of the present application, the bypass branch is arranged between the discharge pipe of the compressor and the inlet of the evaporator in the refrigeration cycle loop, the outlet of the evaporator is connected with the process pipe of the compressor, the valve group is used to selectively conduct the bypass branch and the pipe in which the process pipe is located, and meanwhile, the part of the main pipe in which the condenser is located and the pipe in which the gas return pipe is located are cut off, so that the refrigerant discharged from the discharge pipe of the compressor defrosts the evaporator, the defrosted refrigerant enters the inner cavity of the compressor through the process pipe and preheats the refrigerant, thereby the liquid refrigerant can be completely evaporated into gaseous refrigerant as much as possible, the possibility of liquid strike caused by the return of the liquid refrigerant to the compressor is reduced, the utilization rate of the heat in the compressor is improved, the energy waste is reduced, and the uniform distribution of the temperature in the compressor is maintained, the risk of local overheating is reduced, and the overall energy efficiency of the system is improved.
[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 switching valve, the first switching valve includes a first inlet, a first outlet and a second outlet, the first inlet is connected with the discharge pipe of the compressor, the first outlet is connected with the bypass branch, and the second outlet is connected with the inlet of the condenser, the first switching valve conducts the bypass branch by opening the first inlet and the first outlet, and cuts off the part of the main pipe in which the condenser is located by closing the second outlet.
[0008] 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 used to conduct or cut off the bypass branch, and the second valve body is arranged in the main pipe and located at one end of the inlet of the condenser and used to conduct or cut off the part of the main pipe in which the condenser is located.
[0009] In some embodiments of the present application, the valve group further includes a second switching valve, the second switching valve includes a second inlet, a third outlet and a fourth outlet, the second inlet is connected with the outlet of the evaporator, the third outlet is connected with the process pipe of the compressor, and the fourth outlet is connected with the gas return pipe of the compressor, the second switching valve conducts the pipe in which the process pipe is located by opening the second inlet and the third outlet, and cuts off the pipe in which the gas return pipe is located by closing the fourth outlet.
[0010] In some embodiments of the present application, the sound absorber is provided with an air suction port, the high-pressure cabin is provided with an air exhaust port, one end of the gas return pipe extending into the inner cavity is arranged opposite to and spaced apart from the air suction port, one end of the discharge pipe extending into the inner cavity is connected with the air exhaust port through the pipe, and one end of the process pipe extending into the inner cavity is spaced apart from the air suction port by a preset distance.
[0011] In some embodiments of the present application, the refrigeration system further includes a first heater arranged on the pipe in which the process pipe is located.
[0012] In some embodiments of the present application, the refrigeration system further comprises a temperature sensor for monitoring the temperature of the refrigerant in the process tube, and a controller electrically connected to the temperature sensor, the controller controlling the turning on and off of the first heater according to the temperature of the refrigerant in the process tube.
[0013] In some embodiments of the present application, the refrigeration system further comprises a second heater, the second heater being arranged on one side of the evaporator.
[0014] In some embodiments of the present application, a water pan is further arranged below the evaporator, and the second heater is arranged in the water pan.
[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 one skilled in the art to better understand the technical means of the present application, the following detailed description of the embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following detailed description of the embodiments of the present application. 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 description of the preferred embodiments, and are not meant to limit the present application. Moreover, the same reference numbers in the entire drawings indicate the same 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 description of the preferred embodiments, and are not meant to limit the present application. Moreover, the same reference numbers in the entire drawings indicate the same components. Among them:
[0019] Figure 1 The structure schematic diagram of the refrigeration system of an embodiment of the present application is shown in FIG. 1.
[0020] Figure 2 The structure schematic diagram of the compressor in the refrigeration system shown in FIG. 1 is shown in FIG. 2. Figure 1 The structure schematic diagram of the compressor in the refrigeration system shown in FIG. 1 is shown in FIG. 2.
[0021] Figure 3 The structure schematic diagram of the compressor in the refrigeration system shown in FIG. 1 is shown in FIG. 2. Figure 2 The structure schematic diagram of the compressor in the refrigeration system shown in FIG. 1 is shown in FIG. 2.
[0022] Figure 4 The structure schematic diagram of the compressor in the refrigeration system shown in FIG. 1 is shown in FIG. 2. Figure 3 The structure schematic diagram of the compressor in the refrigeration system shown in FIG. 1 is shown in FIG. 2.
[0023] Figure 5Fig. 1 is a structural schematic diagram of a refrigeration system according to an embodiment of the present application;
[0024] Figure 6 Fig. 4 is a flow chart of a control method of a refrigeration system according to an embodiment of the present application.
[0025] In the drawings, the following reference numerals represent the following:
[0026] 10. Refrigeration system;
[0027] 1. Refrigeration assembly; 11. Compressor; 110. Shell; 110a. Upper shell; 110b. Lower shell; 111. Suction pipe; 112. Discharge pipe; 113. Process pipe; 114. High-pressure chamber; 115. Inner cavity; 116. Silencer; 117. Cylinder; 118. Suction port;
[0028] 12. Condenser; 13. Evaporator; 14. Throttling element; 15. Filter;
[0029] 2. First switching valve; 21. First inlet; 22. First outlet; 23. Second outlet; 2a. First valve body; 2b. Second valve body;
[0030] 3. Refrigeration cycle circuit; 31. Main pipe; 32. Bypass branch;
[0031] 4. Second switching valve; 41. Second inlet; 42. Third outlet; 43. Fourth outlet;
[0032] 5. First heater; 6. Second heater. DETAILED DESCRIPTION
[0033] Exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. Although exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
[0034] 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.
[0035] Although the terms first, second, third, etc. 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.
[0036] Spatially relative terms, such as "inner", "outer", "inward", "outward", "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 context in which it is used. For example, if the device in the figures is turned over, elements described as "below" or "beneath" 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.
[0037] Figure 1 A schematic structural view of a refrigeration system according to an embodiment of the present application, Figure 2 A schematic structural view of a compressor in the refrigeration system shown in Figure 1
[0038] Referring to Figure 1 andFigure 2 The embodiment of the present application provides a refrigeration system 10, comprising a refrigeration assembly 1, a refrigeration cycle circuit 3 and a valve group.
[0039] The refrigeration assembly 1 comprises a compressor 11, a condenser 12, a throttling element 14 and an evaporator 13, the compressor 11 comprises a shell 110 with an inner cavity 115, and a silencer 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 back gas pipes 111, exhaust pipes 112 and process pipes 113 which are distributed at intervals, the back gas pipes 111 are in communication with the cavity of the silencer 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.
[0040] 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 bypass branch 32 is connected between the exhaust pipe 112 and the inlet of the evaporator 13. The throttling element 14 can be, for example but not limited to, a capillary tube, the throttling element 14 is arranged in the main pipeline 31 and located between the condenser 12 and the evaporator 13. The throttling element 14 is used to hinder, restrict and depress the refrigerant flowing therethrough, so as to improve the heat exchange efficiency of the evaporator 13.
[0041] The valve group is configured to selectively conduct the bypass branch 32 and the pipeline where the process pipe 113 is located, and cut off the part of the main pipeline 31 where the condenser 12 is located and the pipeline where the back gas pipe 111 is located, so that the refrigerant discharged from the exhaust pipe 112 of the compressor 11 defrosts the evaporator 13, the defrosted refrigerant enters the inner cavity 115 of the compressor 11 through the process pipe 113, and the refrigerant is preheated.
[0042] In this 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 includes a muffler 116, a cylinder 117, and a high-pressure chamber 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, etc. 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 into the high-pressure chamber 114. The high-pressure chamber 114 is used to reduce the aerodynamic noise generated by the compressed high-pressure 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 gas return pipe 111 is used to return the refrigerant after the evaporator 13 to the compressor 11; the process pipe 113 is generally used for debugging and maintenance of the refrigeration system 10, such as filling the inner cavity 115 with refrigerant, vacuumizing or detecting the system pressure. In the defrosting cycle mode, the functions of the process pipe 113 and the gas return pipe 111 can be adjusted, i.e. the low-temperature refrigerant after the evaporator 13 is returned to the inner cavity 115 of the compressor 11 through the process pipe 113, and the gas return pipe 111 is used for debugging and maintenance of the refrigeration system 10, etc.
[0043] Specifically, in this embodiment, a bypass branch 32 is arranged in the refrigeration cycle circuit 3 and connected between the exhaust pipe 112 of the compressor 11 and the inlet of the evaporator 13, the outlet of the evaporator 13 is connected with the process pipe 113 of the compressor 11, and the bypass branch 32 is selectively conducted by the valve group, so that the refrigeration system 10 can enter the exhaust defrosting cycle mode. The high-temperature and high-pressure refrigerant discharged from the exhaust pipe 112 of the compressor 11 enters the evaporator 13 through the bypass branch 32, and the evaporator 13 is directly defrosted by the high-temperature and high-pressure refrigerant, which fully utilizes the heat of the compressor 11 and reduces energy waste. The power of the compressor 11 is low, and the energy-saving effect is achieved. When defrosting, the evaporator 13 is in a low-temperature state, and the gaseous refrigerant may experience a significant temperature drop after flowing through the evaporator 13, and the temperature further decreases after flowing through the throttling element 14, resulting in 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 hammer and damage the compressor 11.
[0044] To solve the problem of liquid strike of the compressor 11, in the embodiment, the refrigerant after defrosting enters the inner cavity 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 the low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant, the inner cavity 115 of the compressor 11 has high heat, which can be used to preheat the refrigerant. The preheated refrigerant entering the sound attenuation chamber 114 helps to maintain the uniform distribution of the internal temperature of the compressor 11, reducing 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.
[0045] Optionally, the refrigeration system further comprises a sensor assembly for detecting the surface temperature of the evaporator 13 and a controller electrically connected with the sensor assembly and the valve group. The sensor assembly can include a first sensor for detecting the surface temperature of the evaporator 13. The controller controls the on-off of the valve group according to the surface temperature of the evaporator 13 being less than or equal to a first temperature threshold T1, so that the high-temperature refrigerant discharged from the exhaust pipe 112 of the compressor 11 defrosts the evaporator 13, and the refrigerant after defrosting enters the inner cavity 115 of the compressor 11 through the process pipe 113 and preheats the refrigerant. The first temperature threshold T1 needs to be assigned according to different products and different use environments, and is generally higher than 0℃.
[0046] It can be understood that, in the embodiment of the present application, the surface temperature of the evaporator 13 can be the average of the upper surface temperature and the lower surface temperature of the evaporator 13, or the temperature of the middle surface of the evaporator 13.
[0047] According to the refrigeration system 10 provided by the embodiment of the present application, by arranging the bypass branch 32 connected between the exhaust pipe 112 of the compressor 11 and the inlet of the evaporator 13 in the refrigeration cycle circuit 3, and connecting the outlet of the evaporator 13 and the process pipe 113 of the compressor 11, the bypass branch 32 and the pipe in which the process pipe 111 is located are selectively conducted by the valve group, while the part of the main pipe 31 in which the condenser 12 is located and the pipe in which the return pipe 111 is located are cut off, so that the refrigerant discharged from the exhaust pipe 112 of the compressor 11 defrosts the evaporator 13, the refrigerant after defrosting enters the inner cavity 115 of the compressor 11 through the process pipe 113, and the waste heat of the inner cavity 115 is used to preheat the refrigerant, thereby completely evaporating as much liquid refrigerant as possible into gaseous refrigerant, reducing the possibility of liquid strike caused by the return of liquid refrigerant to the compressor 11, improving the utilization rate of the internal heat of the compressor 11, reducing energy waste, and helping to maintain the uniform distribution of the internal temperature of the compressor 11, reducing the risk of local overheating, and improving the overall energy efficiency of the system.
[0048] In some embodiments, the valve assembly includes a first switching valve 2, which includes a first inlet 21, a first outlet 22, and a second outlet 23. The first inlet 21 is connected to the exhaust pipe 112 of the compressor 11, the first outlet 22 is connected to the bypass branch 32, and the second outlet 23 is connected to the inlet of the condenser 12. The first switching valve 2 opens the first inlet 21 and the first outlet 22 to conduct the bypass branch, and at the same time closes the second outlet 23 to cut off the part of the main pipeline 31 where the condenser 12 is located.
[0049] like Figure 1 As shown, the first switching valve 2 is a solenoid valve with one inlet and two outlets. Optionally, the controller is electrically connected to the first switching valve 2 and the sensor assembly. The controller controls the first switching valve 2 to open the first inlet 21 and the first outlet 22 when the surface temperature of the evaporator 13 is less than or equal to the first temperature threshold T1, so as to conduct the bypass branch 32 and the refrigeration system 10 enters the exhaust defrosting cycle mode.
[0050] In some embodiments, the valve assembly further includes a second switching valve 4, which includes a second inlet 41, a third outlet 42, and a fourth outlet 43. The second inlet 41 is connected to the outlet of the evaporator 13, the third outlet 42 is connected to the process pipe 113 of the compressor 11, and the fourth outlet 43 is connected to the return pipe 111 of the compressor 11. The second switching valve 4 opens the second inlet 41 and the third outlet 42 to connect the pipeline where the process pipe 113 is located, and closes the fourth outlet 43 to cut off the pipeline where the return pipe 111 is located.
[0051] like Figure 1 As shown, the second switching valve 4 is a solenoid valve with one inlet and two outlets. Optionally, the controller is electrically connected to the second switching valve 4 and the sensor assembly. In the exhaust defrosting cycle mode, the controller controls the second switching valve 4 to open the second inlet 41 and the third outlet 42, so that the defrosted refrigerant enters the inner cavity 115 of the compressor 11 through the process pipe 113 and preheats the refrigerant.
[0052] 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.
[0053] like Figure 2As 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.
[0054] Figure 3 for Figure 2 The diagram shown is a structural schematic of the compressor without the upper casing. Figure 4 for Figure 3 The diagram shows the refrigerant flow inside the compressor.
[0055] 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 extending into the inner cavity 115 is opposite to and spaced apart from the air intake 118, one end of the exhaust pipe 112 extending into the inner cavity 115 is connected to the exhaust port through a pipeline, and one end of the process pipe 113 extending into the inner cavity 115 is spaced apart from the air intake 118 by a predetermined distance.
[0056] like Figure 4 As shown, the dashed arrows indicate the flow direction of refrigerant from process pipe 113 into inner cavity 115 and intake port 118 in exhaust defrosting cycle mode. The solid arrows indicate the flow direction of refrigerant in exhaust pipe 112. The double-dotted arrows indicate the flow direction of refrigerant from return pipe 111 into intake port 118 in refrigeration cycle mode. In exhaust defrosting cycle mode, since the end of process pipe 113 extending into inner cavity 115 is separated from intake port 118 by a preset distance, after the refrigerant enters inner cavity 115 of compressor 11 from process pipe 113, it splits into two airflows flowing in inner cavity 115. After heat exchange between the refrigerant and the residual heat of inner cavity 115, the two airflows converge at intake port 118 and enter the chamber of muffler 116. Then, they enter cylinder 117 through intake valve and are compressed by piston. The compressed refrigerant enters high-pressure chamber 114 through exhaust valve and is then discharged from exhaust pipe 112 through pipeline to start the next exhaust defrosting cycle.
[0057] In some embodiments, the refrigeration system 10 further includes a first heater 5, which is disposed on the pipeline where the process tube 113 is located.
[0058] like Figure 1As shown, when the temperature of the refrigerant in the process tube 113 is low, condensation and frost may form on the inner surface of the compressor casing 110, causing liquid refrigerant to mix into the gaseous refrigerant, which may cause liquid slugging in the compressor 11. Therefore, in this embodiment, a first heater 5 is provided on the process tube 113 to assist in heating the refrigerant in the process tube 113.
[0059] In some embodiments, the refrigeration system 10 further includes a temperature sensor and a controller electrically connected to the temperature sensor. The temperature sensor is used to monitor the refrigerant temperature in the process tube 113, and the controller controls the opening and closing of the first heater 5 according to the refrigerant temperature in the process tube 113.
[0060] A temperature sensor monitors the refrigerant temperature inside process tube 113. The controller can activate the first heater 5 if the refrigerant temperature falls below a second temperature threshold T2. The second temperature threshold T2 can be, for example, the condensation temperature, typically above 0°C, depending on the specific application environment. The first heater 5 provides additional heat to ensure that the refrigerant temperature does not drop too low before returning to the compressor's internal cavity 115, preventing condensation and frost formation on the compressor's surface. This helps maintain the refrigerant's gaseous state, prevents liquid slugging from the gaseous refrigerant, and ensures the safe and stable operation of the compressor 11.
[0061] In some embodiments, the refrigeration system 10 further includes a second heater 6 disposed on one side of the evaporator 13.
[0062] like Figure 1 As shown, when the surface temperature of evaporator 13 exceeds the first temperature threshold T1, defrosting of evaporator 13 is complete. The second heater 6 is positioned adjacent to evaporator 13, for example, on any one of the upper, lower, left, or right sides of evaporator 13. The controller controls the first switching valve 2 to close the first inlet 21 and the second outlet 23, and controls the second heater 6 to open. The heat provided by the second heater 6 can absorb heat from the refrigerant, evaporating as much of the refrigerant as possible from the low temperature during defrosting into gaseous refrigerant, thus reducing the possibility of liquid slugging in compressor 11. Optionally, the first heater 5 and the second heater 6 can be used in combination to reduce the liquid refrigerant content, increase the evaporation rate of the liquid refrigerant, and further reduce the possibility of liquid slugging, surface condensation, or even frosting in compressor 11.
[0063] In some embodiments, a water receiving tray is provided below the evaporator 13, and the second heater 6 is disposed in the water receiving tray.
[0064] During defrosting, the frost at the bottom of the evaporator 13 melts first, while the frost layer in the middle and upper parts hinders air convection, causing heat to concentrate in the lower part of the evaporator 13. Ice blocks that detach from the surface of the evaporator 13 fall and accumulate in the lower drip tray, where the second heater 6 is located. The sensor assembly may also include a third sensor to detect the temperature of the drain outlet of the drip tray. If the temperature of the drain outlet is greater than a third temperature threshold T3, the ice blocks can be melted into water, reducing the possibility of ice blockage in the drip tray. At this point, frost forms throughout the defrosting cycle. Then, the controller shuts off the second heater 6, and the refrigeration system 10 exits the exhaust defrosting cycle mode, reducing system power consumption.
[0065] It is understandable that the second heater 6 can be a heating wire in the water receiving tray or other types of heaters. The arrangement of the second heater 6 is not limited to being fixed inside the water receiving tray, as long as the defrosting effect is achieved.
[0066] In some embodiments, the first switching valve 2 is further configured to open the first inlet 21 and the second outlet 23 to allow the refrigeration system 10 to enter the refrigeration cycle mode; in the refrigeration cycle mode, the second switching valve 4 is further configured to open the second inlet 41 and the fourth outlet 43 so that the refrigerant discharged from the exhaust pipe 112 of the compressor 11 flows through the condenser 12 and the evaporator 13 in sequence and then returns to the return pipe 111 of the compressor 11.
[0067] like Figure 1 As shown, after receiving a cooling command, the controller controls the first switching valve 2 to close the first outlet 22 and open the first inlet 21 and the second outlet 23 to close the bypass branch 32. Simultaneously, it controls the second switching valve 4 to close the third outlet 42 and open the second inlet 41 and the fourth outlet 43 to open the main pipeline 31. Figure 4 The double-dotted arrow indicates the flow direction of the refrigerant from the return pipe 111 into the suction port 118 in the refrigeration cycle mode. The solid arrow indicates the flow direction of the refrigerant in the exhaust pipe 112. The high-temperature refrigerant discharged from the exhaust pipe 112 of the compressor 11 flows through the condenser 12 and the evaporator 13 in sequence, and then flows back to the return pipe 111 of the compressor 11. The return pipe 111 is opposite to and spaced apart from the suction port 118 of the muffler, so that the return refrigerant can be directly sucked into the muffler 116, and then enters the cylinder 117 to be compressed by the piston. The compressed gaseous refrigerant enters the high-pressure chamber 114. The high-pressure chamber 114 is provided with an exhaust port and is connected to the exhaust pipe 112. The compressed refrigerant is discharged from the exhaust port and the exhaust pipe 112 to start the next refrigeration cycle.
[0068] In some embodiments, the refrigeration assembly 1 further comprises a filter 15, which is arranged 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 the impurities in the refrigerant before entering the throttling element 14, and can also dry the low-temperature and low-pressure refrigerant after flowing through the condenser 12, thereby improving the evaporation efficiency of the evaporator 13.
[0069] In some embodiments, the controller is further electrically connected with the compressor 11, and is further configured to adjust the rotating speed of the compressor 11 according to the surface temperature of the evaporator 13.
[0070] As shown in Figure 1 , if the surface temperature of the evaporator 13 is less than a first temperature threshold T1, the frost and ice on the surface of the evaporator 13 need to be defrosted, and the rotating speed of the compressor 11 can be relatively large to improve the defrosting efficiency. The first temperature threshold T1 can be a dew point temperature, which is determined according to the external environment, for example, when the ambient temperature is 23°C, the first temperature threshold T1 can be 2°C to 4°C, the refrigeration system 10 sends a defrosting instruction and starts to enter the exhaust defrosting circulation mode; if the surface temperature of the evaporator 13 is greater than or equal to the first temperature threshold T1, it indicates that the frost and ice on the surface of the evaporator 13 have been defrosted, and the heat required for defrosting has been reduced, so the rotating speed of the compressor 11 can be reduced, and the refrigeration system 10 exits the exhaust defrosting circulation mode.
[0071] Figure 5 is a structural schematic view of a refrigeration system according to another embodiment of the present application.
[0072] Referring to Figure 5 , the refrigeration system 10 according to another embodiment of the present application is similar to the refrigeration system 10 shown in Figures 1 to 4 , except that the first switching valve 2 can be replaced by a first valve body 2a and a second valve body 2b.
[0073] Specifically, the valve group comprises the first valve body 2a and the second valve body 2b, the first valve body 2a is arranged in the bypass branch 32 and used to open or close the bypass branch 32, and the second valve body 2b is arranged in the main pipeline 31 and located at one end of the inlet of the condenser 12, and used to open or close the part of the main pipeline 31 where the condenser 12 is located.
[0074] In one example, as shown in Figure 5As shown, both the first valve body 2a and the second valve body 2b are solenoid valves with one inlet and one outlet, facilitating the switching of the refrigerant between the refrigeration cycle mode and the defrost cycle mode. Specifically, when the first valve body 2a opens the bypass branch 32 and the second valve body 2b closes the portion of the main pipeline 31 where the condenser 12 is located, the refrigeration system 10 enters the exhaust defrost cycle mode; when the first valve body 2a closes the bypass branch 32 and the second valve body 2b opens the portion of the main pipeline 31 where the condenser 12 is located, the refrigeration system 10 enters the refrigeration cycle mode.
[0075] Figure 6 This is a flowchart illustrating the control method of the refrigeration system according to an embodiment of this application.
[0076] In some embodiments, in the exhaust defrosting cycle mode, the controller controls the compressor speed to a first speed based on the surface temperature of the evaporator 13 being less than or equal to a first temperature threshold T1, and the compressor speed decreases as the defrosting time increases; the controller controls the compressor speed to a second speed based on the surface temperature of the evaporator being greater than a fourth temperature threshold T4 or the compressor 11 running continuously at the first speed for a duration greater than a first duration, and the first speed is greater than the second speed.
[0077] like Figures 1 to 6 As shown, in the exhaust defrosting cycle mode, when the surface temperature of the evaporator 13 is less than or equal to the first temperature threshold T1, the compressor 11 operates at a higher first speed R1 to maintain a higher temperature in the compressor exhaust, which is used to heat the internal piping of the evaporator 13. This controls the compressor 11 to maintain appropriate power, 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 surface temperature of the evaporator is greater than the fourth temperature threshold T4, or when the compressor 11 operates continuously at the first speed for a duration t1 (e.g., the fourth temperature threshold T4 can be 4°C to 10°C, and the first duration t1 can be 10 minutes), the controller controls the compressor 11 to operate at a second speed, where the first speed is greater than the second speed. The first speed and the second speed are respectively the R1 and R2 settings of the compressor 11, which are determined according to specific application scenarios and usage requirements, and will not be elaborated further.
[0078] It is understood that the first temperature threshold T1, the second temperature threshold T2, the third temperature threshold T3, the fourth temperature threshold T4, and the first duration t1 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.
[0079] In addition, this application proposes a refrigeration device, including the refrigeration system 10 of various embodiments of this application. This refrigeration device can be, for example, but not limited to, a refrigerator, freezer, cold storage, etc.
[0080] The above description is only preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A refrigeration system characterized by, The application relates to a refrigeration system. The refrigeration system comprises a refrigeration assembly, a refrigeration cycle loop and a valve group. The refrigeration assembly comprises a compressor, a condenser, a throttling element and an evaporator. The compressor comprises a shell with an inner cavity, a silencer, a cylinder and a high-pressure cabin which are arranged in the inner cavity and are in communication with each other. The shell is provided with a plurality of return gas pipes, exhaust pipes and process pipes which are arranged at intervals.
2. The refrigeration system of claim 1, wherein, The return gas pipes are in communication with the cavity of the silencer.
3. The refrigeration system of claim 1, wherein, The exhaust pipes are in communication with the high-pressure cabin.
4. The refrigeration system of claim 2 or 3, wherein, The process pipes are in communication with the inner cavity.
5. The refrigeration system of claim 1, wherein, The refrigeration cycle loop comprises a main pipeline and a bypass branch.
6. The refrigeration system of claim 1, wherein, The compressor, the condenser, the throttling element and the evaporator are arranged in the main pipeline in sequence.
7. The refrigeration system of claim 6, wherein, The bypass branch is connected between the exhaust pipe and the inlet of the evaporator. The valve group is arranged to selectively open the pipeline where the bypass branch and the process pipe are arranged and to close the part of the main pipeline where the condenser is arranged and the pipeline where the return gas pipe is arranged. The refrigerant discharged from the exhaust pipe of the compressor defrosts the evaporator. The defrosted refrigerant enters the inner cavity of the compressor through the process pipe and preheats the refrigerant. The valve group comprises a first switching valve. The first switching valve comprises a first inlet, a first outlet and a second outlet. The first inlet is connected with the exhaust pipe of the compressor. The first outlet is connected with the bypass branch. The second outlet is connected with the inlet of the condenser. The first switching valve opens the bypass branch by opening the first inlet and the first outlet and closes the part of the main pipeline where the condenser is arranged by closing the second outlet. The valve group comprises a first valve body and a second valve body. The first valve body is arranged in the bypass branch and is used for opening or closing the bypass branch. The second valve body is arranged in the main pipeline and is located at one end of the inlet of the condenser and is used for opening or closing the part of the main pipeline where the condenser is arranged. The valve group further comprises a second switching valve. The second switching valve comprises a second inlet, a third outlet and a fourth outlet. The second inlet is connected with the outlet of the evaporator. The third outlet is connected with the process pipe of the compressor. The fourth outlet is connected with the return gas pipe of the compressor. The second switching valve opens the pipeline where the process pipe is arranged by opening the second inlet and the third outlet and closes the pipeline where the return gas pipe is arranged by closing the fourth outlet. The silencer is provided with an air inlet. The high-pressure cabin is provided with an exhaust outlet. One end of the return gas pipe which extends into the inner cavity is arranged opposite to and at intervals from the air inlet. One end of the exhaust pipe which extends into the inner cavity is connected with the exhaust outlet through a pipeline. One end of the process pipe which extends into the inner cavity is separated from the air inlet by a preset distance. The refrigeration system further comprises a first heater which is arranged on the pipeline where the process pipe is arranged. The refrigeration system further comprises a temperature sensor and a controller which is electrically connected with the temperature sensor. The temperature sensor is used for monitoring the temperature of the refrigerant in the process pipe. The controller controls the opening and closing of the first heater according to the temperature of the refrigerant in the process pipe.
8. The refrigeration system of claim 1, wherein, The refrigeration system further comprises a second heater, which is arranged on one side of the evaporator.
9. The refrigeration system of claim 8, wherein, A water pan is further arranged below the evaporator, and the second heater is arranged in the water pan.
10. A refrigeration appliance characterized in that, A refrigeration system comprising the refrigeration system according to any one of claims 1-9.