Refrigerating system and refrigerating equipment

Abstract

The utility model belongs to the technical field related to refrigeration, and particularly relates to a refrigeration system and a refrigeration device.The refrigeration system comprises a refrigeration assembly, an anti-condensation pipe, a refrigeration circulation loop, a reversing valve and a switching valve; an outlet of the first evaporator and an outlet of the second refrigerant branch are both communicated with an inlet of the second evaporator, and the bypass branch is connected with the condenser and the anti-condensation pipe in parallel; the refrigerating system can execute refrigerating circulation or defrosting circulation through the reversing valve, and when the refrigerating system executes the defrosting circulation, a refrigerant discharged from an outlet of the compressor sequentially passes through the second evaporator, the first evaporator and the switching valve and then returns to an inlet of the compressor through the bypass branch. The liquid impact risk of the compressor and the condensation risk of the box body can be reduced while exhaust defrosting is achieved, and the reliability and stability of system operation are improved.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration, and more specifically, to a refrigeration system and a refrigeration device. Background Art

[0002] For a dual-system refrigeration device system with a refrigerating evaporator and a freezing evaporator, since the food placed in the refrigeration device contains abundant water vapor, and during the process of opening and closing the door of the refrigeration device, the water vapor in the air will also enter the refrigeration device. These water vapors will condense into frost when they encounter the relatively cold inner wall of the refrigeration device. The frost layer is equivalent to an additional thermal resistance, and when it is relatively thick, it will seriously hinder the heat exchange between the evaporator and the air and objects in the refrigeration device, which brings disadvantages such as a significant reduction in the energy efficiency ratio and waste of electric energy. It is necessary to perform periodic defrosting operations on the evaporator and discharge the humid air in the compartment in the form of defrost water.

[0003] Related technologies use the heat of the compressor itself for exhaust defrosting, resulting in a risk of liquid slugging in the compressor or a risk of condensation in the cabinet, and the reliability and stability of the system operation are relatively poor. Summary of the Utility Model

[0004] The purpose of the present application is to provide a refrigeration system and a refrigeration device, which can reduce the risk of liquid slugging in the compressor and the risk of condensation in the cabinet while realizing exhaust defrosting, and improve the reliability and stability of the system operation.

[0005] In a first aspect, the present application provides a refrigeration system, including: a refrigeration assembly, including a compressor, a condenser, a first evaporator, and a second evaporator; an anti-condensation pipe; a refrigeration cycle circuit, including a main pipeline and a first refrigerant branch, a second refrigerant branch, and a bypass branch respectively communicated with the main pipeline. The first evaporator is arranged in the first refrigerant branch, and the outlets of the first evaporator and the second refrigerant branch are both communicated with the inlet of the second evaporator. The second evaporator, the compressor, the condenser, and the anti-condensation pipe are sequentially arranged on the main pipeline, and the pipeline between the inlet of the condenser and the outlet of the anti-condensation pipe is arranged in parallel with the bypass branch; a reversing valve, which is communicated with the compressor, the condenser, and the second evaporator. In a first state, the refrigerant flows along a first direction through the reversing valve, and the refrigeration system executes a refrigeration cycle; in a second state, the refrigerant flows along a second direction through the reversing valve, and the refrigeration system executes a defrosting cycle. The first direction is opposite to the second direction; a switching valve, which is arranged at the connection of the first refrigerant branch, the second refrigerant branch, the bypass branch, and the main pipeline. Among them, when the refrigeration system executes a defrosting cycle, the refrigerant discharged from the outlet of the compressor sequentially passes through the second evaporator, the first evaporator, and the switching valve, and then returns to the inlet of the compressor through the bypass branch.

[0006] According to the refrigeration system and refrigeration equipment provided by the embodiments of the present application, the first evaporator and the second evaporator are arranged in a series-parallel manner in the refrigeration cycle loop, and a reversing valve is arranged in the refrigeration cycle loop, so that during the exhaust defrosting process, the second evaporator is used as a condenser to realize heat pump exhaust defrosting, while the first evaporator is used as an evaporator, effectively reducing the risk of liquid slugging generated by the compressor; at the same time, a switching valve is also arranged in the refrigeration cycle loop, and during the exhaust defrosting process, the switching valve can short-circuit the condenser and the anti-condensation pipe, effectively reducing the risk of condensation on the box body due to the low temperature during the defrosting process, which is beneficial to improving the feasibility and stability of the system operation.

[0007] In addition, the refrigeration system according to the present application may further have the following additional technical features:

[0008] In some embodiments of the present application, the reversing valve includes a first valve port, a second valve port, a third valve port, and a fourth valve port. The first valve port is communicated with the outlet of the compressor, the second valve port is communicated with the inlet of the compressor, the third valve port is communicated with both the inlet of the condenser and the inlet of the bypass branch, and the fourth valve port is communicated with the outlet of the second evaporator. Among them, in the first state, the first valve port can be conducted with the third valve port, and the second valve port is conducted with the fourth valve port; in the second state, the first valve port can be conducted with the fourth valve port, and the second valve port is conducted with the third valve port.

[0009] In some embodiments of the present application, the switching valve includes a first inlet, a second inlet, a first outlet, and a second outlet. The first inlet is communicated with the outlet of the anti-condensation pipe, one end of the bypass branch is communicated with the inlet of the condenser, the other end of the bypass branch is communicated with the second inlet, the first outlet is communicated with the first refrigerant branch, and the second outlet is communicated with the second refrigerant branch; wherein, the switching valve is configured such that when the refrigeration system executes the refrigeration cycle, the first inlet can be conducted with either the first refrigerant branch or the second refrigerant branch; when the refrigeration system executes the defrosting cycle, the second inlet can be conducted with the first refrigerant branch.

[0010] In some embodiments of the present application, the switching valve includes a valve seat and a valve block arranged coaxially. The end face of the valve seat is provided with a first inlet, a second inlet, a first outlet, and a second outlet that are circumferentially spaced apart. The first inlet and the second inlet are opened on a circle with the central axis of the valve seat as the center and a first length as the radius, and the first outlet and the second outlet are opened on a circle with the central axis of the valve seat as the center and a second length as the radius, and the first length is greater than the second length; the valve block includes a connecting portion and a first notch and a second notch provided on the connecting portion. The connecting portion fits with the end face of the valve seat and can rotate relative to the valve seat, so that the first notch can selectively communicate with either the first inlet or the second inlet, and the second notch can selectively communicate with either the first outlet or the second outlet.

[0011] In some embodiments of the present application, the refrigeration assembly further includes a first throttling element and a second throttling element. The first throttling element is disposed in the first refrigerant branch and is communicated with the inlet of the first evaporator. The second throttling element is disposed in the second refrigerant branch.

[0012] In some embodiments of the present application, the refrigeration system further includes a first check valve, a second check valve, a third check valve, a fourth check valve and a fifth check valve. The first check valve is disposed on the main pipeline and is located between the second evaporator and the first evaporator. The second check valve is arranged in parallel with the first check valve, and the conduction direction of the first check valve is opposite to that of the second check valve. The third check valve is disposed in the first refrigerant branch, and the inlet of the third check valve is communicated with the outlet of the first throttling element. The fourth check valve is arranged in parallel with the first refrigerant branch, and the conduction direction of the third check valve is opposite to that of the fourth check valve. The fifth check valve is disposed in the second refrigerant branch, and the inlet of the fifth check valve is communicated with the outlet of the second throttling element. The conduction direction of the fifth check valve is the same as that of the first check valve.

[0013] In some embodiments of the present application, the refrigeration assembly further includes a third throttling element, which is disposed between the second check valve and the first evaporator.

[0014] In a second aspect, the present application provides a refrigeration device, including: a box body, in which a first compartment and a second compartment are arranged; a refrigeration system according to various embodiments of the present application, where the first evaporator of the refrigeration system is disposed in the first compartment and the second evaporator is disposed in the second compartment; a sensor assembly for detecting the environmental information of the refrigeration device; and a controller, which is electrically connected to the sensor assembly, the compressor, the reversing valve and the switching valve of the refrigeration system respectively. The controller is configured to control the reversing valve and the switching valve to operate according to the environmental information and the cumulative operating time of the compressor, so that the refrigeration system executes a refrigeration cycle or a defrosting cycle.

[0015] In some embodiments of the present application, the refrigeration device further includes a first fan and a second fan. The first fan is used to guide the air flow through the first evaporator, and the second fan is used to guide the air flow through the second evaporator.

[0016] In some embodiments of the present application, the sensor assembly includes a first sensor, a second sensor, an environmental temperature and humidity sensor, a first defrost sensor and a second defrost sensor. The first sensor is used to detect the temperature of the first compartment, the second sensor is used to detect the temperature of the second compartment, the environmental temperature and humidity sensor is used to detect the environmental temperature and the environmental relative humidity, the first defrost sensor is used to detect the temperature of the first evaporator, and the second defrost sensor is used to detect the temperature of the second evaporator.

[0017] The above description is only an overview of the technical solution of the present application. In order to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specific embodiments of the present application are specifically given. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. Among them:

[0019] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. Among them:

[0020] Figure 1 is a schematic structural diagram of a refrigeration system according to an embodiment of the present application;

[0021] Figure 2 is Figure 1 an enlarged schematic structural diagram of a reversing valve in the refrigeration system shown;

[0022] Figure 3 is Figure 1 an enlarged schematic structural diagram of a switching valve in the refrigeration system shown;

[0023] Figure 4 is Figure 1 an exploded schematic structural diagram of a switching valve in the refrigeration system shown;

[0024] Figure 5 is a schematic structural diagram of a refrigeration device according to an embodiment of the present application;

[0025] Figure 6 is a schematic diagram of a defrosting method for a second evaporator of a refrigeration device according to an embodiment of the present application;

[0026] Figure 7 is a schematic diagram of a defrosting method for a first evaporator of a refrigeration device according to an embodiment of the present application.

[0027] The reference numerals in the drawings are represented as follows:

[0028] 10, refrigeration system; 1, refrigeration component; 11, compressor; 12, condenser; 13, first evaporator; 14, second evaporator; 15, first throttling element; 16, second throttling element; 17, third throttling element;

[0029] 2. Anti-condensation tube; 3. Refrigeration cycle circuit; 30. Main pipeline; 31. First refrigerant branch; 32. Second refrigerant branch; 33. Bypass branch;

[0030] 4. Commutating valve; 41. First valve port; 42. Second valve port; 43. Third valve port; 44. Fourth valve port;

[0031] 5. Switching valve; 51. First inlet; 52. Second inlet; 53. First outlet; 54. Second outlet; 55. Valve seat; 56. Valve block; 560. Connecting part; 561. First notch; 562. Second notch;

[0032] 61. First check valve; 62. Second check valve; 63. Third check valve; 64. Fourth check valve; 65. Fifth check valve; 7. Filter device;

[0033] 100. Refrigeration equipment; 101. First compartment; 102. Second compartment. Detailed implementation manners

[0034] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the 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 described herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be fully conveyed to those skilled in the art.

[0035] It should be understood that the terms used herein are only for the purpose of describing specific exemplary embodiments and are not intended to be limiting. Unless otherwise clearly indicated in the context, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "include", "comprise", "contain", and "have" are inclusive and thus specify the presence of the 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 their combinations. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the execution order is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0036] Although terms such as first, second, and third may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first" and "second" and other numerical terms do not imply an order or sequence when used in the text. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0037] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inner", "outer", "inside", "outside", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature will then be oriented "above" or "over" the other element or feature. Thus, the exemplary term "below" can include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.

[0038] Figure 1 The structural schematic diagram of a refrigeration system according to an embodiment of the present application Figure 5 The structural schematic diagram of a refrigeration device according to an embodiment of the present application. Refer to Figure 1 and Figure 5 As shown in FIGS. and, the refrigeration system 10 provided by the embodiment of the present application includes a refrigeration assembly 1, an anti-condensation tube 2, a refrigeration cycle circuit 3, a reversing valve 4, and a switching valve 5.

[0039] The refrigeration assembly 1 includes a compressor 11, a condenser 12, a first evaporator 13, and a second evaporator 14.

[0040] The refrigeration cycle circuit 3 includes a main pipeline 30 and a first refrigerant branch 31, a second refrigerant branch 32, and a bypass branch 33 respectively communicating with the main pipeline 30. The first evaporator 13 is disposed in the first refrigerant branch 31. The outlets of the first evaporator 13 and the second refrigerant branch 32 are both communicated with the inlet of the second evaporator 14. The second evaporator 14, the compressor 11, the condenser 12, and the anti-condensation tube 2 are sequentially disposed on the main pipeline 30, and the pipeline between the inlet of the condenser 12 and the outlet of the anti-condensation tube 2 is disposed in parallel with the bypass branch 33.

[0041] The reversing valve 4 is connected to the compressor 11, the condenser 12, and the second evaporator 14. In the first state, the refrigerant flows through the reversing valve 4 in the first direction, and the refrigeration system 10 performs a refrigeration cycle. In the second state, the refrigerant flows through the reversing valve 4 in the second direction, and the refrigeration system 10 performs a defrosting cycle. The first direction is opposite to the second direction.

[0042] The switching valve 5 is disposed at the connection of the first refrigerant branch 31, the second refrigerant branch 32, the bypass branch 33, and the main pipeline 30. When the refrigeration system performs a defrosting cycle, the refrigerant discharged from the outlet of the compressor 11 sequentially passes through the second evaporator 14, the first evaporator 13, and the switching valve 5, and then returns to the inlet of the compressor 11 through the bypass branch 33.

[0043] In this embodiment, the reversing valve 4 has two working states, that is, the reversing valve 4 is powered off in the first state and the reversing valve 4 is powered on in the second state. Thus, the refrigerant can form two circulation circuits with opposite directions through the reversing valve 4. The first circulation circuit is when the reversing valve 4 is powered off, and the refrigeration system 10 operates normally to perform a refrigeration cycle. At this time, the refrigerant flows through the reversing valve 4 in the first direction, so that the high-temperature and high-pressure gaseous refrigerant discharged from the outlet of the compressor 11 becomes a liquid refrigerant after being condensed and dissipated heat by the condenser 12. The inlet of the anti-condensation tube 2 is connected to the outlet of the condenser 12, and the heat of the mixed refrigerant of the high-temperature liquid refrigerant and the gaseous refrigerant is used to prevent condensation of the anti-condensation tube 2. Then, after the refrigerant flows through the switching valve 5, if it enters the first refrigerant branch 31, the liquid refrigerant sequentially evaporates and absorbs heat through the first evaporator 13 and the second evaporator 14, taking away the heat of the first compartment and the second compartment and becoming a low-temperature and low-pressure gas, and then returning to the compressor 11 to complete a refrigeration cycle for the first compartment. After the refrigerant flows through the switching valve 5, if it enters the second refrigerant branch 32, it becomes a low-temperature and low-pressure gas-liquid two-phase mixed refrigerant after being obstructed, limited in flow, and depressurized by the second throttling element 16. The liquid refrigerant evaporates and absorbs heat in the second evaporator 14, taking away the heat of the second compartment and becoming a low-temperature and low-pressure gas, and then returning to the compressor 11 to complete a refrigeration cycle for the second compartment.

[0044] The second loop is when the reversing valve 4 is energized, the refrigerant flows along the second direction through the reversing valve 4, and the refrigeration system 10 performs a defrosting cycle. At this time, the high-temperature and high-pressure gaseous refrigerant discharged from the outlet of the compressor 11 becomes a liquid refrigerant after condensing and dissipating heat in the second evaporator 14. The heat of the high-temperature and high-pressure gaseous refrigerant is used to defrost the second evaporator 14. The liquid refrigerant flows through the first evaporator 13, evaporates and absorbs heat to become a low-temperature and low-pressure gas, and after passing through the switching valve 5, returns to the inlet of the compressor 11 through the bypass branch 33, thus realizing heat pump exhaust defrosting. During the defrosting process, since the second evaporator 14 is used as a condenser, the heat of the high-temperature and high-pressure gaseous refrigerant can defrost the second evaporator 14. Compared with the related art using an electric heater for defrosting, the energy consumption can be reduced; while the first evaporator 13 is used as an evaporator, and finally the refrigerant returns to the inlet of the compressor 11 as a low-temperature and low-pressure gas, avoiding the accumulation of some liquid refrigerant at the inlet of the compressor 11 due to incomplete evaporation in the first evaporator 13, and reducing the risk of liquid hammer generated when the compressor 11 suddenly starts. In addition, the refrigerant directly returns to the inlet of the compressor 11 from the bypass branch 33 and does not flow through the anti-condensation tube 2 and the condenser 12, which can effectively prevent the problem of condensation on the box body due to the low temperature during the defrosting process.

[0045] In addition, the first evaporator 13 in the first compartment can be defrosted in two ways: natural defrosting and return air defrosting. If the temperature of the first evaporator 13 is higher than the temperature of the first compartment, natural defrosting can be carried out; if the temperature of the first evaporator 13 is lower than the temperature of the first compartment, there is recoverable cold in the first evaporator 13, and the air in the first compartment can be operated for return air defrosting. In this way, the cold in the first evaporator 13 can be effectively recovered, making it more energy-efficient.

[0046] The refrigeration system provided by the embodiment of the present application arranges the first evaporator 13 for refrigerating the refrigerated compartment and the second evaporator 14 for refrigerating the second compartment in a series-parallel manner in the refrigeration cycle loop 3, and sets a reversing valve 4 in the refrigeration cycle loop 3 so that the second evaporator 14 is used as a condenser during the exhaust defrosting process to realize heat pump exhaust defrosting, while the first evaporator 13 is used as an evaporator, effectively reducing the risk of liquid hammer generated by the compressor 11; at the same time, a switching valve 5 is also set in the refrigeration cycle loop 3, and during the exhaust defrosting process, the switching valve 5 can short-circuit the condenser 12 and the anti-condensation tube 2, effectively reducing the risk of condensation on the box body due to the low temperature during the defrosting process, which is beneficial to improving the feasibility and stability of the system operation.

[0047] Figure 2 For Figure 1 The enlarged structural schematic diagram of the reversing valve in the shown refrigeration system.

[0048] In some embodiments, the reversing valve 4 includes a first valve port 41, a second valve port 42, a third valve port 43, and a fourth valve port 44. The first valve port 41 is in communication with the outlet of the compressor 11, the second valve port 42 is in communication with the inlet of the compressor 11, the third valve port 43 is in communication with both the inlet of the condenser 12 and the inlet of the bypass branch 33, and the fourth valve port 44 is in communication with the outlet of the second evaporator 14. Among them, in the first state, the first valve port 41 can be conducted with the third valve port 43, and the second valve port 42 can be conducted with the fourth valve port 44; in the second state, the first valve port 41 can be conducted with the fourth valve port 44, and the second valve port 42 can be conducted with the third valve port 43.

[0049] Refer to Figure 1 and Figure 2 , the reversing valve 4 is a four-way solenoid valve. In the first state, the reversing valve 4 is de-energized, the first valve port 41 is conducted with the third valve port 43, and the second valve port 42 is conducted with the fourth valve port 44. The high-temperature and high-pressure gaseous refrigerant discharged from the outlet of the compressor 11 enters from the first valve port 41 and is discharged from the third valve port 43 into the condenser 12. After passing through the refrigeration cycle and becoming a low-temperature and low-pressure gas, it returns to the inlet of the compressor 11 from the fourth valve port 44 and the second valve port 42. In the second state, the reversing valve 4 is energized, the first valve port 41 is conducted with the fourth valve port 44, and the second valve port 42 is conducted with the third valve port 43. The high-temperature and high-pressure gaseous refrigerant discharged from the outlet of the compressor 11 enters from the first valve port 41 and is discharged from the fourth valve port 44 to the second evaporator 14 for defrosting.

[0050] Figure 3 is Figure 1 the enlarged structural schematic diagram of the switching valve in the refrigeration system shown; Figure 4 is Figure 1 the exploded structural schematic diagram of the switching valve in the refrigeration system shown.

[0051] In some embodiments, the switching valve 5 includes a first inlet 51, a second inlet 52, a first outlet 53, and a second outlet 54. The first inlet 51 is in communication with the outlet of the anti-condensation tube 2. One end of the bypass branch 33 is in communication with the inlet of the condenser 12, and the other end of the bypass branch 33 is in communication with the second inlet 52. The first outlet 53 is in communication with the first refrigerant branch 31, and the second outlet 54 is in communication with the second refrigerant branch 32; among them, the switching valve 5 is configured such that when the refrigeration system performs a refrigeration cycle, the first inlet 51 can be conducted with either the first refrigerant branch 31 or the second refrigerant branch 32; when the refrigeration system performs a defrosting cycle, the second inlet 52 can be conducted with the first refrigerant branch 31.

[0052] Refer to Figure 1 and Figure 3, the switching valve 5 is a two-inlet and two-outlet solenoid valve. When the refrigeration system performs a refrigeration cycle, the first inlet 51 can be communicated with the first refrigerant branch 31 or the second refrigerant branch 32, that is, the first inlet 51 is communicated with the first outlet 53 or the first inlet 51 is communicated with the second outlet 54. When the refrigeration system performs a defrosting cycle, the second inlet 52 can be communicated with the first refrigerant branch 31, that is, the second inlet 52 is communicated with the first outlet 53, so that the bypass branch 33 shorts the condenser 12 and the anti-condensation tube 2.

[0053] In some embodiments, the switching valve 5 includes a valve seat 55 and a valve block 56 arranged coaxially. The end face of the valve seat 55 is provided with a first inlet 51, a second inlet 52, a first outlet 53 and a second outlet 54 which are circumferentially spaced apart. The first inlet 51 and the second inlet 52 are opened on a circumference centered on the central axis of the valve seat 55 and with a first length as the radius. The first outlet 53 and the second outlet 54 are opened on a circumference centered on the central axis of the valve seat 55 and with a second length as the radius, and the first length is greater than the second length; the valve block 56 includes a connecting portion 560 and a first notch 561 and a second notch 562 arranged on the connecting portion 560. The connecting portion 560 fits with the end face of the valve seat 55 and can rotate relative to the valve seat 55, so that the first notch 561 can selectively communicate with any one of the first inlet 51 and the second inlet 52, and the second notch 562 can selectively communicate with any one of the first outlet 53 and the second outlet 54.

[0054] Refer to Figure 4 , the end face of the valve seat 55 is a flat mating surface, and the valve block 56 can fit with the end face of the valve seat 55 and make a rotational movement at a certain angle. The end face of the valve seat 55 is provided with a first inlet 51, a second inlet 52, a first outlet 53 and a second outlet 54 which are circumferentially spaced apart, and are opened on circumferences centered on the central axis of the valve seat 55 with different lengths as the radii and are separated by a certain distance. The switching valve 5 further includes a first inlet pipe, a second inlet pipe, a first outlet pipe and a second outlet pipe fixedly connected to the valve seat 55. The first inlet pipe is communicated with the first inlet 51, the second inlet pipe is communicated with the second inlet 52, the first outlet pipe is communicated with the first outlet 53, and the second outlet pipe is communicated with the second outlet 54. The first inlet pipe, the second inlet pipe, the first outlet pipe and the second outlet pipe are respectively communicated with the refrigeration cycle circuit 3 to meet the requirements of the refrigeration system 10.

[0055] The switching valve 5 may further include a control unit and a motor (not shown in the figure). The control unit controls the rotor of the motor to drive the valve block 56 to rotate relative to the valve seat 55. The connecting portion 560 of the valve block 56 is used for rotatably mating with the end face of the valve seat 55. When the first notch 561 of the connecting portion 560 rotates to correspond to the first inlet 51, the first inlet 51 is in a conducting state. When the first notch 561 of the connecting portion 560 rotates to correspond to the second inlet 52, the second inlet 52 is in a conducting state. When the first inlet 51 or the second inlet 52 is in a conducting state, if the second notch 562 corresponds to any one of the first outlet 53 and the second outlet 54, the corresponding flow channel can be conducted. For example, the first inlet 51 is conducted with any one of the first outlet 53 and the second outlet 54, or the second inlet 52 is conducted with any one of the first outlet 53 and the second outlet 54. When the remaining portions of the connecting portion 560 other than the first notch 561 and the second notch 562 cover the first outlet 53 and the second outlet 54, the first outlet 53 and the second outlet 54 are respectively in a closed state.

[0056] It can be understood that the switching valve 5 may also have other structural forms, as long as the on-off function of two inlets and two outlets can be realized, and no limitation is made here.

[0057] In some embodiments, the refrigeration assembly 10 further includes a first throttling element 15 and a second throttling element 16. The first throttling element 15 is disposed in the first refrigerant branch 31 and is communicated with the inlet of the first evaporator 13. The second throttling element 16 is disposed in the second refrigerant branch 32.

[0058] The first throttling element 15 and the second throttling element 16 may be, for example but not limited to, capillary tubes. The first throttling element 15 and the second throttling element 16 may be disposed in the refrigeration cycle loop 3 simultaneously, or may be disposed in the refrigeration cycle loop 3 separately. The high-temperature and high-pressure gas discharged from the compressor 11 becomes a liquid refrigerant after being condensed and dissipated heat by the condenser 12. After flowing through the flow channel in which the first inlet 51 and the first outlet 53 of the switching valve 5 are conducted, the first throttling element 15 can obstruct, limit the flow rate, and reduce the pressure of the high-temperature and high-pressure liquid refrigerant to become a low-temperature and low-pressure liquid. Or, after flowing through the flow channel in which the second inlet 52 and the second outlet 54 of the switching valve 5 are conducted, the second throttling element 16 can obstruct, limit the flow rate, and reduce the pressure of the high-temperature and high-pressure liquid refrigerant to become a low-temperature and low-pressure liquid, improving the heat exchange efficiency of the condenser 12.

[0059] In some embodiments, the refrigeration system 10 further includes a first check valve 61, a second check valve 62, a third check valve 63, a fourth check valve 64, and a fifth check valve 65. The first check valve 61 is disposed on the main pipeline 30 and is located between the second evaporator 14 and the first evaporator 13. The second check valve 62 is arranged in parallel with the first check valve 61, and the conduction direction of the first check valve 61 is opposite to that of the second check valve 62. The third check valve 63 is disposed on the first refrigerant branch 31, and the inlet of the third check valve 63 is communicated with the outlet of the first throttling element 15. The fourth check valve 64 is arranged in parallel with the first refrigerant branch 31, and the conduction direction of the third check valve 63 is opposite to that of the fourth check valve 64. The fifth check valve 65 is disposed on the second refrigerant branch 32, and the inlet of the fifth check valve 65 is communicated with the outlet of the second throttling element 16. The conduction direction of the fifth check valve 65 is the same as that of the first check valve 61.

[0060] Refer to Figure 1 , the reversing valve 4 is de-energized in the first state and energized in the second state. Thus, the refrigerant can form two circulation loops with opposite directions through the reversing valve 4. Among them, when the refrigeration system 10 performs the refrigeration cycle, looking along the direction indicated by the arrow in the figure, the flow directions of the refrigerant in the third check valve 63, the fifth check valve 65, and the first check valve 61 are the same; when the refrigeration system 10 performs the defrosting cycle, the flow directions of the refrigerant in the second check valve 62 and the fourth check valve 64 are the same. The setting of multiple check valves can avoid the problem of reverse flow of the refrigerant in the circulation loop.

[0061] In some embodiments, the refrigeration assembly 1 further includes a third throttling element 17, and the third throttling element 17 is disposed between the second check valve 62 and the first evaporator 13.

[0062] Refer to Figure 1, a first one-way valve 61 is disposed on the main pipeline 30 and is located between the second evaporator 14 and the first evaporator 13. The second one-way valve 62 is arranged in parallel with the first one-way valve 61. The third throttling element 17 is disposed between the second one-way valve 62 and the first evaporator 13, that is, the third throttling element 17 is disposed between the first evaporator 13 and the second evaporator 14 in the defrosting cycle loop. In this way, when the refrigeration system 10 executes the defrosting cycle, the high-temperature and high-pressure gaseous refrigerant discharged from the outlet of the compressor 11 becomes a liquid refrigerant after condensing and dissipating heat through the second evaporator 14. The heat of the high-temperature and high-pressure gaseous refrigerant is used to defrost the second evaporator 14. The liquid refrigerant becomes a low-temperature and low-pressure liquid refrigerant after being obstructed, current-limited, and pressure-reduced by the third throttling element 17. The liquid refrigerant evaporates and absorbs heat inside the first evaporator 13, taking away the heat of the first compartment and becoming a low-temperature and low-pressure gas, and finally returns to the inlet of the compressor 11 from the bypass branch 33. The third throttling element 17 can enable the liquid refrigerant to be completely evaporated as much as possible inside the first evaporator 13, avoiding the problem that part of the liquid refrigerant accumulates at the inlet of the compressor 11 without being completely evaporated inside the first evaporator 13, which may cause liquid hammer when the compressor 11 is suddenly started.

[0063] In some embodiments, the refrigeration system 10 further includes a filtering device 7. The inlet of the filtering device 7 is communicated with the condenser 12, and the outlet of the filtering device 7 is communicated with the inlet of the anti-condensation tube 2. The filtering device 7 is disposed in the main pipeline 30 and is located between the condenser 12 and the anti-condensation tube 2. The filtering device 7 is used to filter impurities, dust, etc. in the refrigerant to prevent impurities and dust from entering the anti-condensation tube 2.

[0064] Figure 5 It is a schematic structural diagram of a refrigeration device according to an embodiment of the present application.

[0065] Refer to Figure 5 , the embodiment of the present application provides a refrigeration device 100, including a box body, the refrigeration system 10 of each embodiment of the present application, a sensor assembly, and a controller.

[0066] A first compartment 101 and a second compartment 102 are arranged inside the box body. The first evaporator 13 of the refrigeration system 10 is disposed in the first compartment 101, and the second evaporator 14 is disposed in the second compartment 102.

[0067] The sensor assembly is used to detect the environmental information of the refrigeration device. The controller is electrically connected to the sensor assembly, the compressor 11 of the refrigeration system 10, the reversing valve 4, and the switching valve 5 respectively. The controller is configured to control the reversing valve 4 and the switching valve 5 of the refrigeration system to work according to the environmental information and the cumulative operating time of the compressor 11, so that the refrigeration system executes a refrigeration cycle or a defrosting cycle.

[0068] The refrigeration device 100 provided by the embodiment of the present application arranges the first evaporator 13 for refrigerating the first chamber 101 and the second evaporator 14 for refrigerating the second chamber 102 in a series-parallel manner in the refrigeration cycle loop 3, and a reversing valve 4 is arranged in the refrigeration cycle loop 3, so that the second evaporator 14 is used as a condenser to realize heat pump exhaust defrosting during the exhaust defrosting process, while the first evaporator 13 is used as an evaporator, effectively reducing the risk of liquid hammer generated by the compressor 11; at the same time, a switching valve 5 is also arranged in the refrigeration cycle loop 3, and the switching valve 5 can short-circuit the condenser 12 and the anti-condensation pipe 2 during the exhaust defrosting process, effectively reducing the risk of condensation on the box body due to the low temperature during the defrosting process, which is beneficial to improving the feasibility and stability of the system operation.

[0069] In some embodiments, the refrigeration device further includes a first fan and a second fan. The first fan is used to guide the air flow through the first evaporator 13, and the second fan is used to guide the air flow through the second evaporator 14. The first fan blows the air in the first chamber 101 to flow, so as to make the cold quantity evenly distributed. Since the frost layer in the first chamber 101 is generally thin, the first chamber 101 can be defrosted by the first fan. The second fan is used to blow the air in the second chamber 102 to flow, so as to make the cold quantity evenly distributed.

[0070] In some embodiments, the sensor assembly includes a first sensor, a second sensor, an environmental temperature and humidity sensor, a first defrost sensor and a second defrost sensor. The first sensor is used to detect the temperature of the first chamber 101, the second sensor is used to detect the temperature of the second chamber 102, the environmental temperature and humidity sensor is used to detect the environmental temperature and the environmental relative humidity, the first defrost sensor is used to detect the temperature of the first evaporator 13, and the second defrost sensor is used to detect the temperature of the second evaporator 14.

[0071] The environmental information of the refrigeration device includes the temperature of the first chamber 101, the temperature of the second chamber 102, the environmental temperature and the environmental relative humidity, as well as the temperature of the first evaporator 13 and the temperature of the second evaporator 14. It is determined whether the defrosting is over according to the temperature of the first evaporator 13, and it is determined whether the defrosting is over according to the temperature of the second evaporator 14.

[0072] Figure 6 It is a schematic diagram of the defrosting method of the second evaporator of the refrigeration device according to an embodiment of the present application.

[0073] Refer to Figure 1 and Figure 6, when the refrigeration equipment is operating, if it is detected that the cumulative operating time t1 of the compressor 11 is greater than the defrosting cycle corresponding to the current ambient temperature and humidity, it indicates that the second evaporator 14 needs to exhaust for defrosting. First, reduce the rotational speed of the compressor 11 to the first rotational speed f1, then energize the reversing valve 4, EF is connected, and GH is connected, so that the exhaust gas of the compressor 11 can be led to the second evaporator 14 that needs to be defrosted; switch the switching valve 5 to connect DB and close AC, so that the refrigerant does not pass through the condenser 12 and the anti-condensation pipe 2 during defrosting, preventing the condensation of the cabinet of the refrigeration equipment. Then the second fan stops operating, and the compressor operates at the first rotational speed f1 for exhaust defrosting. During the defrosting process, the temperature of the first compartment 101 is detected. If the temperature of the first compartment 101 < the first temperature threshold T1, in order to prevent the temperature of the first compartment 101 from being too low, the first fan stops operating, otherwise the first fan continues to operate at gear R1. During the defrosting process, if the second defrosting sensor detects that the temperature of the second compartment 102 > the second temperature threshold T2, or the defrosting time > t1, the defrosting of the second evaporator 14 ends, otherwise continue with exhaust defrosting.

[0074] Figure 7 Schematic diagram of the defrosting method of the first evaporator of the refrigeration equipment according to an embodiment of the present application.

[0075] The defrosting of the first evaporator in the first compartment 101 adopts natural defrosting and return air defrosting. When the temperature of the first compartment 101 reaches the shutdown temperature and refrigeration is not requested, if the second evaporator 14 is not defrosting, first detect whether the difference between the temperature Tg- of the first evaporator 13 and the temperature Tr of the first compartment 101 satisfies Tg - Tr < x; if not satisfied, the first fan stops operating for natural defrosting. If Tg - Tr < x is satisfied, it indicates that there is recoverable cold energy in the first evaporator 13, and the first fan can be operated for return air defrosting. During the return air defrosting process, the temperature Tr of the first compartment 101 is detected. If Tr < the third temperature threshold T3 is satisfied, in order to prevent the temperature of the first compartment 101 from being too low, the first fan stops operating, otherwise the first fan operates at gear R2. During the defrosting process, if the first defrosting sensor detects that the temperature Tr of the first evaporator 13 > the fourth temperature threshold T4 or the defrosting time of the first evaporator 13 > t2, the defrosting of the first evaporator 13 ends.

[0076] It should be noted that the first rotational speed f1, the first temperature threshold T1, the second temperature threshold T2, the third temperature threshold T3, the fourth temperature threshold T4, the gears R1, R2, the time t1, and t2 in this embodiment are not fixed values and can be adjusted according to different products and usage environments.

[0077] It can be understood that the refrigeration equipment 100 provided in the embodiments of the present application can be various refrigeration equipment such as refrigerators, freezers, cold storages, and refrigerated and frozen trucks.

[0078] Therefore, in the refrigeration equipment provided by the embodiments of the present application, a reversing valve 4 is provided in the refrigeration cycle circuit, so that during the exhaust defrosting process, the second evaporator 14 is used as a condenser to achieve heat pump exhaust defrosting, while the first evaporator 13 is used as an evaporator, effectively reducing the risk of liquid slugging generated by the compressor; at the same time, a switching valve 5 is also provided in the refrigeration cycle circuit, and during the exhaust defrosting process, the switching valve 5 can short-circuit the condenser 12 and the anti-condensation tube 2, effectively reducing the risk of the box body generating condensation due to the low temperature during the defrosting process, which is beneficial to improving the feasibility and stability of the system operation.

[0079] As described above, the foregoing are only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A refrigeration system, characterized in that, Comprising: A refrigeration assembly, including a compressor, a condenser, a first evaporator, and a second evaporator An anti-condensation tube; A refrigeration cycle circuit, including a main pipeline and a first refrigerant branch, a second refrigerant branch, and a bypass branch respectively communicating with the main pipeline. The first evaporator is disposed in the first refrigerant branch. The outlet of the first evaporator and the outlet of the second refrigerant branch are communicated with the inlet of the second evaporator. The second evaporator, the compressor, the condenser, and the anti-condensation tube are sequentially disposed on the main pipeline, and the pipeline between the inlet of the condenser and the outlet of the anti-condensation tube is arranged in parallel with the bypass branch; A reversing valve, communicating with the compressor, the condenser, and the second evaporator. In the first state, the refrigerant flows along a first direction through the reversing valve, and the refrigeration system executes a refrigeration cycle; in the second state, the refrigerant flows along a second direction through the reversing valve, and the refrigeration system executes a defrosting cycle. The first direction is opposite to the second direction; and A switching valve, disposed at the connection of the first refrigerant branch, the second refrigerant branch, the bypass branch, and the main pipeline. Wherein, when the refrigeration system executes a defrosting cycle, the refrigerant discharged from the outlet of the compressor sequentially passes through the second evaporator, the first evaporator, and the switching valve, and then returns to the inlet of the compressor through the bypass branch.

2. The refrigeration system according to claim 1, characterized in that, The reversing valve includes a first valve port, a second valve port, a third valve port, and a fourth valve port. The first valve port is communicated with the outlet of the compressor, the second valve port is communicated with the inlet of the compressor, the third valve port is communicated with both the inlet of the condenser and the inlet of the bypass branch, and the fourth valve port is communicated with the outlet of the second evaporator. Wherein, in the first state, the first valve port can be conducted with the third valve port, and the second valve port is conducted with the fourth valve port; in the second state, the first valve port can be conducted with the fourth valve port, and the second valve port is conducted with the third valve port.

3. The refrigeration system according to claim 1, characterized in that, The switching valve includes a first inlet, a second inlet, a first outlet, and a second outlet. The first inlet is communicated with the outlet of the anti-condensation tube. One end of the bypass branch is communicated with the inlet of the condenser, and the other end of the bypass branch is communicated with the second inlet. The first outlet is communicated with the first refrigerant branch, and the second outlet is communicated with the second refrigerant branch; Wherein, the switching valve is configured such that when the refrigeration system executes a refrigeration cycle, the first inlet can be conducted with the first refrigerant branch or the second refrigerant branch; when the refrigeration system executes a defrosting cycle, the second inlet can be conducted with the first refrigerant branch.

4. The refrigeration system according to claim 3, characterized in that, The switching valve includes a valve seat and a valve block arranged coaxially. The end face of the valve seat is provided with the first inlet, the second inlet, the first outlet, and the second outlet that are circumferentially spaced apart. The first inlet and the second inlet are opened on a circumference centered on the central axis of the valve seat and with a first length as the radius. The first outlet and the second outlet are opened on a circumference centered on the central axis of the valve seat and with a second length as the radius, and the first length is greater than the second length; The valve block includes a connecting portion and a first notch and a second notch provided on the connecting portion. The connecting portion fits with the end face of the valve seat and can rotate relative to the valve seat so that the first notch can selectively communicate with any one of the first inlet and the second inlet, and the second notch can selectively communicate with any one of the first outlet and the second outlet.

5. The refrigeration system according to any one of claims 1 to 4, characterized in that, The refrigeration assembly further includes a first throttling element and / or a second throttling element. The first throttling element is arranged in the first refrigerant branch and communicates with the inlet of the first evaporator. The second throttling element is arranged in the second refrigerant branch.

6. The refrigeration system according to claim 5, characterized in that The refrigeration system further includes a first check valve, a second check valve, a third check valve, a fourth check valve, and a fifth check valve. The first check valve is arranged on the main pipeline and is located between the second evaporator and the first evaporator. The second check valve is arranged in parallel with the first check valve, and the conduction direction of the first check valve is opposite to that of the second check valve. The third check valve is arranged in the first refrigerant branch, and the inlet of the third check valve communicates with the outlet of the first throttling element. The fourth check valve is arranged in parallel with the first refrigerant branch, and the conduction direction of the third check valve is opposite to that of the fourth check valve. The fifth check valve is arranged in the second refrigerant branch, and the inlet of the fifth check valve communicates with the outlet of the second throttling element. The conduction direction of the fifth check valve is the same as that of the first check valve.

7. The refrigeration system according to claim 5, characterized in that, The refrigeration assembly further includes a third throttling element. The third throttling element is arranged between the second check valve and the first evaporator.

8. A refrigeration device, characterized in that, Including: A box body, in which a first compartment and a second compartment are arranged; The refrigeration system according to any one of claims 1-7, wherein the first evaporator of the refrigeration system is arranged in the first compartment, and the second evaporator is arranged in the second compartment; A sensor assembly for detecting the environmental information of the refrigeration device; And A controller, which is electrically connected to the sensor assembly, the compressor, the reversing valve, and the switching valve of the refrigeration system respectively. The controller is configured to control the reversing valve and the switching valve to work according to the environmental information and the cumulative operating time of the compressor, so that the refrigeration system executes a refrigeration cycle or a defrosting cycle.

9. The refrigeration device according to claim 8, characterized in that, The refrigeration device further includes a first fan and a second fan. The first fan is used to guide the air flow through the first evaporator, and the second fan is used to guide the air flow through the second evaporator.

10. The refrigeration device according to claim 9, characterized in that, The sensor assembly includes a first sensor, a second sensor, an ambient temperature and humidity sensor, a first defrost sensor, and a second defrost sensor. The first sensor is used to detect the temperature of the first compartment, the second sensor is used to detect the temperature of the second compartment, the ambient temperature and humidity sensor is used to detect the ambient temperature and the ambient relative humidity, the first defrost sensor is used to detect the temperature of the first evaporator, and the second defrost sensor is used to detect the temperature of the second evaporator.

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