A refrigeration device

Abstract

The present invention relates to a refrigeration device, which includes a first flow path switching mechanism. The first flow path switching mechanism is connected to the evaporator inlet flow paths of at least two evaporators connected in parallel. By the first flow path switching mechanism, the evaporator through which the refrigerant flows is selected, so as to refrigerate the low-temperature storage chambers corresponding to different evaporators, realize different temperature requirements of different low-temperature storage chambers, can realize the differential requirements of multi-temperature zone temperatures, and meet the storage requirements of various foods. The present invention can realize multi-temperature zone refrigeration and deep low-temperature refrigeration, and can increase the unit refrigerating capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and specifically, to a refrigeration device. Background Art

[0002] With the improvement of people's living standards, people pay more and more attention to the safety and health of food. Fruits and vegetables, meats, seafood, beverages, etc. all have different suitable storage temperatures. In order to store various foods more scientifically and healthily and keep them in their respective fresh-keeping temperature zones, multi-temperature zone refrigerators are becoming more and more popular among consumers, and the market share is gradually increasing.

[0003] The implementation methods of existing multi-temperature zone refrigerators are as follows. For example, in patent document CN106568218A, the two cycles are that the high-boiling refrigerant liquid separated by the gas-liquid separator is throttled and supplied to two parallel or series-connected high-temperature evaporators, and the low-boiling refrigerant gas is condensed and throttled to provide cooling capacity for a low-temperature evaporator. The three cycles in patent document CN106482432A are to add one or two regenerations on the basis of patent document CN106568218A. Patent document CN106568274A adopts a double loop on the basis of patent document CN106568218A and patent document CN106482432A to increase the temperature zones.

[0004] However, after the compressor of the existing multi-temperature zone refrigerator starts, all evaporators are in an operating state. The temperature of each compartment can only be adjusted by adjusting the fan speed or controlling the start and stop, and the temperature control accuracy is not high. Moreover, the temperature difference between different temperature zones is small, and a very low refrigeration temperature cannot be achieved. Providing cooling capacity for multiple series-connected or parallel-connected evaporators at a single evaporation temperature will increase the heat transfer temperature difference in the high-temperature compartment, increasing the irreversible heat transfer loss. And when a certain compartment does not need to be cooled, the refrigerant will still flow through the evaporator of that compartment, increasing the cooling capacity loss and reducing the overall efficiency of the machine. Therefore, the temperature difference between different temperature zones of the existing multi-temperature zone refrigerator is small, a very low refrigeration temperature cannot be achieved, and the storage requirements of some special foods cannot be met. Summary of the Invention

[0005] To solve the technical problems in the prior art that after the compressor starts, all evaporators cool simultaneously, the refrigeration flow path cannot be switched, the temperature difference between different temperature zones is small, and the cooling capacity utilization rate is low, the present invention provides a refrigeration device, whose refrigeration system can select the corresponding evaporator for refrigeration after the compressor starts, can achieve multiple temperature zones with a large temperature difference, and meet the storage requirements of various foods.

[0006] To achieve the above object, the present invention adopts the following technical solution: A refrigeration device, comprising:

[0007] A low-temperature storage compartment and a refrigeration system for supplying cooling to the low-temperature storage compartment;

[0008] The refrigeration system includes:

[0009] A compressor, which is connected with a compressor inlet flow path and a compressor outlet flow path;

[0010] A first condenser, which is connected with the compressor outlet flow path and is connected with a first condenser outlet flow path;

[0011] A gas-liquid separator, which is connected with the first condenser outlet flow path and is connected with a gas-liquid separator gaseous outlet flow path and a gas-liquid separator liquid outlet flow path;

[0012] A second condenser, which is connected with the gas-liquid separator gaseous outlet flow path and is connected with a second condenser outlet flow path;

[0013] At least two evaporators connected in parallel, the inlet and outlet of each evaporator are respectively connected with an evaporator inlet flow path and an evaporator outlet flow path, and a throttling device is arranged on the evaporator inlet flow path;

[0014] A regenerator, which includes a first pipeline and a second pipeline that perform heat exchange with each other, the first pipeline is used to connect the second condenser outlet flow path, and the second pipeline is used to connect the compressor inlet flow path and the evaporator outlet flow path;

[0015] A first flow path switching mechanism, the first flow path switching mechanism is connected with the first pipeline and several evaporator inlet flow paths, and the first flow path switching mechanism is used to controllably switch the flow direction of the refrigerant.

[0016] The technical solution of the present invention has the following technical effects compared with the prior art: The refrigeration equipment of the present invention includes a first flow path switching mechanism, the first flow path switching mechanism is connected with the evaporator inlet flow paths of at least two evaporators connected in parallel, and the evaporator through which the refrigerant flows is selected by the first flow path switching mechanism, so as to refrigerate the low-temperature storage rooms corresponding to different evaporators, realize different temperature requirements of different low-temperature storage rooms, and can realize the different temperature requirements of multiple temperature zones and meet the storage requirements of various foods. The present invention can realize multi-temperature zone refrigeration and deep low-temperature refrigeration, and can increase the unit refrigeration capacity. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a control block diagram of the refrigeration equipment according to Embodiment 1 of the present invention.

[0019] Figure 2 Schematic diagram of the refrigeration system of the refrigeration device according to the first embodiment of the present invention.

[0020] Figure 3 Flow chart of the refrigeration device according to the first embodiment of the present invention.

[0021] Figure 4 Control block diagram of the refrigeration device according to the second embodiment of the present invention.

[0022] Figure 5 Schematic diagram of the refrigeration system of the refrigeration device according to the second embodiment of the present invention.

[0023] Figure 6 Schematic diagram of the refrigeration system of the refrigeration device according to the third embodiment of the present invention.

[0024] Reference numerals:

[0025] 101 - Compressor; 102 - First condenser; 103 - Gas-liquid separator; 104 - Second condenser; 105 - Regenerator; 106 - First throttling device; 107 - Check valve; 108 - First flow path switching mechanism; 109 - Second throttling device; 110 - Refrigerated evaporator; 111 - Third throttling device; 112 - Freezer evaporator; 113 - Variable temperature evaporator; 114 - Secondary refrigerated evaporator; 115 - Refrigerated flow path switching mechanism; 116 - Secondary refrigerated flow path switching mechanism; 117 - Freezer flow path switching mechanism; 118 - Variable temperature flow path switching mechanism; 119 - Fourth throttling device; 120 - First three-way valve; 121 - Second three-way valve. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0028] The terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0029] A refrigeration device, comprising:

[0030] A low-temperature storage chamber and a refrigeration system for supplying cold to the low-temperature storage chamber;

[0031] The refrigeration system includes:

[0032] A compressor, connected with a compressor inlet flow path and a compressor outlet flow path;

[0033] A first condenser, connected to the compressor outlet flow path and connected with a first condenser outlet flow path;

[0034] A gas-liquid separator, connected to the first condenser outlet flow path and connected with a gas-liquid separator gas outlet flow path and a gas-liquid separator liquid outlet flow path;

[0035] A second condenser, connected to the gas-liquid separator gas outlet flow path and connected with a second condenser outlet flow path;

[0036] At least two evaporators connected in parallel, the inlet and outlet of each evaporator are respectively connected to an evaporator inlet flow path and an evaporator outlet flow path, and a throttling device is arranged on the evaporator inlet flow path;

[0037] A regenerator, including a first pipeline and a second pipeline that perform heat exchange with each other, the first pipeline is used to connect the second condenser outlet flow path, and the second pipeline is used to connect the compressor inlet flow path and the evaporator outlet flow path;

[0038] A first flow path switching mechanism, the first flow path switching mechanism is connected to the first pipeline and several evaporator inlet flow paths, and the first flow path switching mechanism is used to controllably switch the flow direction of the refrigerant.

[0039] In some embodiments, the evaporator includes a refrigerated evaporator and a frozen evaporator connected in parallel with each other, the refrigerated evaporator is used to provide cold to the refrigerated chamber, and the frozen evaporator is used to provide cold to the freezer;

[0040] The first flow path switching mechanism is used to controllably switch the flow direction of the refrigerant to preferentially flow to the refrigerated evaporator when both the refrigerated chamber and the freezer need refrigeration, so as to preferentially meet the requirements of the refrigerated chamber.

[0041] The evaporator further includes a variable-temperature evaporator, and the variable-temperature evaporator is used to provide cold to the variable-temperature chamber;

[0042] The variable-temperature evaporator and the freezing evaporator are connected in series, and the inlet of the variable-temperature evaporator is connected to the outlet of the freezing evaporator. The temperature requirement of the variable-temperature chamber is different from that of the refrigerating chamber and the freezing chamber to provide users with multiple temperature ranges.

[0043] In some embodiments, the refrigeration system further includes:

[0044] A freezing branch and / or a variable-temperature branch; wherein, the freezing branch is connected in parallel to the freezing evaporator, and the variable-temperature branch is connected in parallel to the variable-temperature evaporator;

[0045] A freezing flow path switching mechanism for controllably switching the refrigerant flow to the freezing branch or the freezing evaporator;

[0046] A variable-temperature flow path switching mechanism for controllably switching the refrigerant flow to the variable-temperature branch or the variable-temperature evaporator.

[0047] The freezing flow path switching mechanism is used to controllably switch the refrigerant flow to the freezing evaporator when the freezing chamber needs refrigeration, and controllably switch the refrigerant flow to the freezing branch when the freezing chamber does not need refrigeration;

[0048] The variable-temperature flow path switching mechanism is used to controllably switch the refrigerant flow to the variable-temperature evaporator when the variable-temperature chamber needs refrigeration, and controllably switch the refrigerant flow to the variable-temperature branch when the variable-temperature chamber does not need refrigeration. Cooling can be provided to the freezing chamber or the variable-temperature chamber separately, improving the utilization rate of cooling capacity.

[0049] In some embodiments, the refrigeration system further includes:

[0050] A secondary refrigerating evaporator for providing cooling capacity to the secondary refrigerating chamber. The secondary refrigerating evaporator is connected in series to the refrigerating evaporator, and the inlet of the secondary refrigerating evaporator is connected to the outlet of the refrigerating evaporator.

[0051] The refrigeration system further includes:

[0052] A refrigerating branch and / or a secondary refrigerating branch, wherein the refrigerating branch is connected in parallel to the refrigerating evaporator, and the secondary refrigerating branch is connected in parallel to the secondary refrigerating evaporator;

[0053] A refrigerating flow path switching mechanism for controllably switching the refrigerant flow to the refrigerating branch or the refrigerating evaporator;

[0054] A secondary refrigerating flow path switching mechanism for controllably switching the refrigerant flow to the secondary refrigerating branch or the secondary refrigerating evaporator.

[0055] The refrigerating flow path switching mechanism is used to controllably switch the refrigerant flow to the refrigerating evaporator when the refrigerating chamber needs refrigeration, and controllably switch the refrigerant flow to the refrigerating branch when the refrigerating chamber does not need refrigeration; the secondary refrigerating flow path switching mechanism is used to controllably switch the refrigerant flow to the secondary refrigerating evaporator when the secondary refrigerating chamber needs refrigeration; and is used to controllably switch the refrigerant flow to the secondary refrigerating branch when the secondary refrigerating chamber does not need refrigeration. It can supply cold to the refrigerating chamber and the secondary refrigerating chamber respectively, improving the utilization rate of cold quantity.

[0056] The refrigeration device includes a blower corresponding to the evaporator, and the blower is used to be started controllably when the refrigerant flows through the evaporator.

[0057] In order to reduce the throttling loss, the liquid outlet flow path of the gas-liquid separator is connected to the evaporator outlet flow path through a first throttling device; a check valve for preventing the refrigerant from flowing back to the evaporator is provided in the evaporator outlet flow path.

[0058] Embodiment 1

[0059] The refrigeration device includes a box body forming a low-temperature storage chamber, a low-temperature storage chamber, a refrigeration system for supplying cold to the low-temperature storage chamber, a temperature detection module for detecting the temperature of the low-temperature storage chamber, a controller, and a refrigeration system. The number of low-temperature storage chambers matches the number of evaporators in the refrigeration system, and the evaporator is used to refrigerate the low-temperature storage chamber.

[0060] As Figure 1 、 2 shown, this embodiment takes the refrigeration device including two parallel evaporators: a refrigerating evaporator 110 and a freezing evaporator 112, and a variable-temperature evaporator 113 connected in series on the freezing evaporator 112 as an example for illustration.

[0061] The refrigeration device of this embodiment includes a refrigerating chamber corresponding to the refrigerating evaporator 110, a freezing chamber corresponding to the freezing evaporator 112, and a variable-temperature chamber corresponding to the variable-temperature evaporator 113. The refrigerating evaporator 110 is used to provide cold quantity to the refrigerating chamber, the freezing evaporator 112 is used to provide cold quantity to the freezing chamber, and the variable-temperature evaporator 113 is used to provide cold quantity to the variable-temperature chamber.

[0062] The temperature detection module, located inside the low-temperature storage chamber, is used to detect the temperature of the low-temperature storage chamber and transmit the temperature signal to the controller. One temperature detection module is correspondingly provided for each low-temperature storage chamber.

[0063] The following is a specific description of the refrigeration system:

[0064] As Figure 2 shown, the refrigeration system of this embodiment includes:

[0065] Compressor 101, the compressor 101 includes a compressor inlet and a compressor outlet. The compressor inlet is connected to a compressor inlet flow path, and the compressor outlet is connected to a compressor outlet flow path.

[0066] First condenser 102, the first condenser 102 includes a first condenser inlet and a first condenser outlet. The first condenser inlet is connected to the compressor outlet flow path, and the first condenser outlet is connected to a first condenser outlet flow path.

[0067] Gas-liquid separator 103, the gas-liquid separator 103 includes a gas-liquid separator inlet, a gaseous outlet, and a liquid outlet. The gas-liquid separator inlet is connected to the first condenser outlet flow path, the gaseous outlet is connected to a gas-liquid separator gaseous outlet flow path, and the liquid outlet is connected to a gas-liquid separator liquid outlet flow path.

[0068] Second condenser 104, the second condenser 104 includes a second condenser inlet and a second condenser outlet. The second condenser inlet is connected to the gas-liquid separator gaseous outlet flow path, and the second condenser outlet is connected to a second condenser outlet flow path.

[0069] Refrigerated evaporator 110, the inlet of the refrigerated evaporator 110 is connected to a refrigerated evaporator inlet flow path, and the outlet of the refrigerated evaporator 110 is connected to a refrigerated evaporator outlet flow path. A second throttling device 109 is provided on the refrigerated evaporator inlet flow path.

[0070] Series-connected freezing evaporator 112 and variable-temperature evaporator 113, the inlet of the freezing evaporator 112 is connected to a freezing evaporator inlet flow path, the outlet of the freezing evaporator 112 is connected to the inlet of the variable-temperature evaporator 113, and the outlet of the variable-temperature evaporator 113 is connected to a variable-temperature evaporator outlet flow path. A third throttling device 111 is provided on the freezing evaporator inlet flow path.

[0071] Regenerator 105, including a first pipeline and a second pipeline that perform heat exchange with each other. The inlet of the first pipeline is connected to the second condenser 104 outlet flow path. The second pipeline is used to connect the compressor inlet flow path and the evaporator outlet flow path (the pipeline after the refrigerated evaporator outlet flow path and the variable-temperature evaporator outlet flow path converge).

[0072] First flow path switching mechanism, the first flow path switching mechanism is connected to the first pipeline, the refrigerated evaporator inlet flow path, and the freezing evaporator inlet flow path. The first flow path switching mechanism is used to controllably switch the flow direction of the refrigerant.

[0073] In this embodiment, the first flow path switching mechanism 108 is a three-way valve 108. The inlet of the three-way valve 108 is connected to the first pipeline outlet of the regenerator 105. The first outlet of the three-way valve 108 is connected to the refrigerated evaporator inlet flow path, and the second outlet of the three-way valve 108 is connected to the freezing evaporator inlet flow path.

[0074] Of course, the first flow path switching mechanism may also include two switching valves. The inlets of both switching valves are connected to the outlet of the first pipeline. The outlet of one switching valve is connected to the flow path at the inlet of the refrigerating evaporator, and the outlet of the other switching valve is connected to the flow path at the inlet of the freezing evaporator.

[0075] A controller is used to control the compressor and the first flow path switching mechanism. Specifically, the controller controls the start / stop and operating frequency of the compressor according to the relationship between the set temperature of the low-temperature storage chamber and the actual temperature detected by the temperature detection module, and controls the three-way valve to be connected to the flow path at the inlet of the refrigerating evaporator or the flow path at the inlet of the freezing evaporator.

[0076] In order to reduce throttling losses, the liquid outlet flow path of the gas-liquid separator is connected to the pipeline after the refrigerating evaporator outlet flow path and the variable-temperature evaporator outlet flow path converge through the first throttling device 106. A check valve 107 for preventing the refrigerant from flowing back to the evaporator is provided on the converged pipeline.

[0077] The refrigeration device includes a blower corresponding to the evaporator. The controller is used to control the start / stop of the blower, and the blower is controlled to start when the refrigerant flows through the evaporator.

[0078] The refrigeration device uses a mixed refrigerant, and the mixed refrigerant includes two refrigerants with different boiling points.

[0079] In this embodiment, the refrigeration system uses azeotropic mixture as the refrigerant. The mixed gaseous refrigerant rich in low-boiling refrigerant separated by the gas-liquid separator 103 provides cooling capacity for the three evaporators, and the fluid rich in low-boiling refrigerant can achieve a lower refrigeration temperature; the separated mixed liquid refrigerant rich in high-boiling refrigerant is mixed with the mixed refrigerant rich in low-boiling refrigerant at the outlet of the refrigerating evaporator 110 or the variable-temperature evaporator 113 and then enters the regenerator 105 for heat exchange, increasing the subcooling degree of the mixed refrigerant rich in low-boiling refrigerant at the outlet of the second condenser 104, reducing the flash gas generated after throttling, increasing the unit refrigerating capacity. At the same time, as the subcooling degree increases, the throttling process is closer to the isentropic process, reducing the throttling loss.

[0080] The first flow path switching mechanism in this embodiment is used to control the flow direction of the refrigerant to preferentially flow to the refrigerating evaporator when both the refrigerating chamber and the freezing chamber need refrigeration.

[0081] Specifically, before the refrigeration device is started, both the compressor and the blower are stopped. When the refrigeration device is started, when the temperature t in the refrigerating chamber R is higher than the maximum refrigerating temperature, the compressor starts, the three-way valve 108 is in state 1 where it is connected to the refrigerating evaporator, the refrigerating blower starts, and the fluid rich in low-boiling refrigerant is throttled by the second throttling device 109 and then enters the refrigerating evaporator 110 to absorb heat. Until it is monitored that the temperature t in the refrigerating chamber RLower than the set minimum temperature t Rmin When this happens, the refrigerating fan stops, and the temperature t F of the freezer compartment and the temperature t V of the variable temperature compartment are monitored.

[0082] When it is monitored that the temperature t R of the refrigerating compartment is lower than the set maximum temperature t Rmax , and the temperature t F of the freezer compartment or the temperature t V of the variable temperature compartment is higher than the corresponding set maximum temperature t Fmax , t Vmax , the three-way valve 108 switches to state 2 connected to the freezer evaporator, and the fluid rich in low-boiling refrigerant passes through the third throttling device 111 and then enters the freezer evaporator 112 and the variable temperature evaporator 113 to absorb heat. When t F >t Fmax , the refrigerating fan starts. When t V >t Vmax , the variable temperature fan starts; when it is monitored that the temperature t F of the freezer compartment is lower than the set minimum temperature t Fmin , the refrigerating fan stops. When it is monitored that the temperature t V of the variable temperature compartment is lower than the set minimum temperature t Vmin , the variable temperature fan stops. At the same time, during the temperature reduction process of the freezer compartment and the variable temperature compartment, the temperature t R of the refrigerating compartment is continuously monitored. Once the temperature t R of the refrigerating compartment is higher than the set maximum temperature t Rmax , the three-way valve 108 switches to state 1 connected to the refrigerating evaporator.

[0083] As Figure 3 shown, the control process is described as follows:

[0084] S1. Start.

[0085] S2. The compressor and the fan are both in the stopped state.

[0086] S3. The temperature detection module detects the temperature t R of the refrigerating compartment, and judges whether the temperature t R of the refrigerating compartment is higher than the set maximum temperature t Rmax . If so, go to step S4; otherwise, go to step S18.

[0087] S4. The controller controls the compressor to start.

[0088] S5. The controller controls the three-way valve 108 to be in state 1, connected to the refrigerating evaporator.

[0089] S6. The refrigerating fan starts.

[0090] S7. Determine the temperature t in the refrigerating chamber R Is it lower than the set minimum temperature t Rmin . If yes, go to step S8; otherwise, go to step S7.

[0091] S8. Stop the refrigerating fan.

[0092] S9. Determine the temperature t in the freezing chamber F Is it higher than the set maximum temperature t Fmax , if yes, go to step S10; otherwise, go to step S23.

[0093] S10. The controller controls the three-way valve 108 to be in state 2 and connects to the freezing evaporator.

[0094] S11. Start the freezing fan.

[0095] S12. The temperature t in the freezing chamber F Is it lower than the set minimum temperature t Fmin , if yes, go to step S13; otherwise, go to step S25.

[0096] S13. Stop the freezing fan.

[0097] S14. Determine the temperature t in the variable-temperature chamber V Is it higher than the set maximum temperature t Vmax , if yes, go to step S15; otherwise, go to step S2.

[0098] S15. Start the variable-temperature fan.

[0099] S16. Determine the temperature t in the variable-temperature chamber V Is it lower than the set maximum temperature t Vmin , if yes, go to step S17; otherwise, go to step S29.

[0100] S17. Stop the variable-temperature fan and go to step S2.

[0101] S18. Determine the temperature t in the freezing chamber F Is it higher than the set maximum temperature t Fmax , if yes, go to step S19; otherwise, go to step S20.

[0102] S19. Start the compressor and go to step S10.

[0103] S20. Determine the temperature t in the variable-temperature chamber V Is it higher than the set maximum temperature t Vmax , if yes, go to step S22; otherwise, go to step S2.

[0104] S21. Start the compressor.

[0105] S22. The controller controls the three-way valve 108 to be in state 2, connects to the refrigeration evaporator, and proceeds to step S15.

[0106] S23. Determine whether the temperature t of the variable-temperature compartment V is lower than the set maximum temperature t Vmin . If so, proceed to step S24; otherwise, proceed to step S2.

[0107] S24. The controller controls the three-way valve 108 to be in state 2, connects to the refrigeration evaporator, and proceeds to step S15.

[0108] S25. Determine whether the temperature t of the refrigerating compartment R is higher than the set maximum temperature t Rmax . If so, proceed to step S5; otherwise, proceed to step S26.

[0109] S26. Determine whether the temperature t of the variable-temperature compartment V is higher than the set maximum temperature t Vmax . If so, proceed to step S12; otherwise, proceed to step S27.

[0110] S27. The variable-temperature blower stops. Proceed to step S12.

[0111] S29. Determine whether the temperature t of the refrigerating compartment R is higher than the set maximum temperature t Rmax . If so, proceed to step S5; otherwise, proceed to step S30.

[0112] S30. Determine whether the temperature t of the freezing compartment F is higher than the set maximum temperature t Fmax . If so, proceed to step S11; otherwise, proceed to step S16.

[0113] Embodiment II

[0114] The difference between this embodiment and Embodiment I is that the refrigeration device in this embodiment includes four low-temperature storage compartments.

[0115] As Figure 4 , 5 shown, this embodiment includes four evaporators corresponding to four low-temperature storage compartments, specifically including a primary refrigerating compartment corresponding to the refrigeration evaporator 110, a freezing compartment corresponding to the freezing evaporator 112, a variable-temperature compartment corresponding to the variable-temperature evaporator 113, and a secondary refrigerating compartment corresponding to the secondary refrigeration evaporator 114. The refrigeration evaporator 110 is used to provide cooling capacity to the primary refrigerating compartment, the freezing evaporator 112 is used to provide cooling capacity to the freezing compartment, the variable-temperature evaporator 113 is used to provide cooling capacity to the variable-temperature compartment, and the secondary refrigeration evaporator 114 is used to provide cooling capacity to the secondary refrigerating compartment.

[0116] As shown Figure 5 In the refrigeration system of the refrigeration device according to this embodiment, a refrigerated evaporator 110 and a secondary refrigerated evaporator 114 are connected in series, and a frozen evaporator 112 and a variable-temperature evaporator 113 are connected in series. The series-connected refrigerated evaporator 110 and secondary refrigerated evaporator 114 are connected in parallel with the series-connected frozen evaporator 112 and variable-temperature evaporator 113.

[0117] A refrigerated branch is connected in parallel to the refrigerated evaporator 110, a frozen branch is connected in parallel to the frozen evaporator 112, a variable-temperature branch is connected in parallel to the variable-temperature evaporator 113, and a secondary refrigerated branch is connected in parallel to the secondary refrigerated evaporator 114.

[0118] A refrigerated flow path switching mechanism 115 is configured to controllably switch the refrigerant flow to the refrigerated branch or the refrigerated evaporator 110.

[0119] A secondary refrigerated flow path switching mechanism 116 is configured to controllably switch the refrigerant flow to the secondary refrigerated branch or the secondary refrigerated evaporator 114.

[0120] A frozen flow path switching mechanism 117 is configured to controllably switch the refrigerant flow to the frozen branch or the frozen evaporator 112;

[0121] A variable-temperature flow path switching mechanism 118 is configured to controllably switch the refrigerant flow to the variable-temperature branch or the variable-temperature evaporator 113.

[0122] The refrigerated flow path switching mechanism 115, the secondary refrigerated flow path switching mechanism 116, the frozen flow path switching mechanism 117, and the variable-temperature flow path switching mechanism 118 are all three-way valves.

[0123] The connection between the refrigerated evaporator 110 and the inlet of the refrigerated branch is switched by the refrigerated flow path switching mechanism 115.

[0124] The inlet of the refrigerated flow path switching mechanism 115 is connected to the second throttling device 109, the first outlet is connected to the inlet of the refrigerated evaporator 110, and the second outlet is connected to the inlet of the refrigerated branch.

[0125] The connection between the secondary refrigerated evaporator 114 and the inlet of the secondary refrigerated branch is switched by the secondary refrigerated flow path switching mechanism 116.

[0126] The inlet of the secondary refrigerated flow path switching mechanism 116 is connected to the outlet of the refrigerated evaporator 110 and the refrigerated branch, the first outlet is connected to the inlet of the secondary refrigerated evaporator 114, and the second outlet is connected to the inlet of the secondary refrigerated branch.

[0127] The connection between the frozen evaporator 112 and the inlet of the frozen branch is switched by the frozen flow path switching mechanism 117.

[0128] The inlet of the refrigerating flow path switching mechanism 117 is connected to the third throttling device 111, the first outlet is connected to the inlet of the refrigerating evaporator 112, and the second outlet is connected to the inlet of the refrigerating branch.

[0129] The switching between the variable temperature evaporator 113 and the inlet of the variable temperature branch is achieved through the variable temperature flow path switching mechanism 118.

[0130] The inlet of the variable temperature flow path switching mechanism 118 is connected to the outlets of the refrigerating evaporator 112 and the refrigerating branch, the first outlet is connected to the inlet of the variable temperature evaporator 113, and the second outlet is connected to the inlet of the variable temperature branch.

[0131] The refrigerating flow path switching mechanism 117 is used to controllably switch the refrigerant flow to the refrigerating evaporator 112 when the refrigerating chamber corresponding to the refrigerating evaporator 112 needs refrigeration, and controllably switch the refrigerant flow to the refrigerating branch when the refrigerating chamber corresponding to the refrigerating evaporator 112 does not need refrigeration.

[0132] The variable temperature flow path switching mechanism 118 is used to controllably switch the refrigerant flow to the variable temperature evaporator 113 when the variable temperature chamber corresponding to the variable temperature evaporator 113 needs refrigeration, and controllably switch the refrigerant flow to the variable temperature branch when the variable temperature chamber corresponding to the variable temperature evaporator 113 does not need refrigeration.

[0133] The refrigerating flow path switching mechanism 115 is used to controllably switch the refrigerant flow to the refrigerating evaporator 110 when the refrigerating chamber corresponding to the refrigerating evaporator 110 needs refrigeration, and controllably switch the refrigerant flow to the refrigerating branch when the refrigerating chamber corresponding to the refrigerating evaporator 110 does not need refrigeration.

[0134] The secondary refrigerating flow path switching mechanism 116 is used to controllably switch the refrigerant flow to the secondary refrigerating evaporator 114 when the secondary refrigerating chamber corresponding to the secondary refrigerating evaporator 114 needs refrigeration; it is used to controllably switch the refrigerant flow to the secondary refrigerating branch when the secondary refrigerating chamber corresponding to the secondary refrigerating evaporator 114 does not need refrigeration.

[0135] The first flow path switching mechanism of this embodiment is used to controllably switch the flow direction of the refrigerant to preferentially flow to the refrigerating evaporator when both the refrigerating chamber corresponding to the refrigerating evaporator and the refrigerating chamber corresponding to the refrigerating evaporator need refrigeration.

[0136] The controller is used to control the compressor, the first flow path switching mechanism 108, the refrigerating flow path switching mechanism 115, the secondary refrigerating flow path switching mechanism 116, the refrigerating flow path switching mechanism 117, and the variable temperature flow path switching mechanism 118.

[0137] The controller is used to control the fan corresponding to the evaporator to start when the actual temperature of the low-temperature storage room corresponding to the evaporator is higher than the highest set temperature; the controller is used to control the fan corresponding to the evaporator to stop when the actual temperature of the low-temperature storage room corresponding to the evaporator is lower than the lowest set temperature. Specifically, the working process of the refrigeration equipment is as follows:

[0138] When it is monitored that the temperature t of the primary cold storage compartment RⅠ is higher than the set highest temperature t RⅠmax and the temperature t of the secondary cold storage compartment RⅡ is lower than the set lowest temperature t RⅡmin the three-way valve 108 is in state 1 (the state of being connected to the refrigerating evaporator), the refrigerating flow path switching mechanism 115 is in state 1 (the state of being connected to the refrigerating evaporator 110), the secondary refrigerating flow path switching mechanism 116 is in state 2 (the state of being connected to the secondary refrigerating branch), the fan corresponding to the refrigerating evaporator starts, and the fans corresponding to the freezing evaporator, the variable-temperature evaporator, and the secondary refrigerating evaporator stop. The fluid rich in low-boiling refrigerant passes through the second throttling device 109 for throttling and then enters the refrigerating evaporator 110 to absorb heat, and then returns to the compressor through the check valve 107 and the regenerator 105. Until it is monitored that the temperature t of the primary cold storage compartment RⅠ is lower than the set lowest temperature t RⅠmin the fan corresponding to the refrigerating evaporator stops.

[0139] When it is monitored that the temperature t of the primary cold storage compartment RⅠ is lower than the set lowest temperature t RⅠmin and the temperature t of the secondary cold storage compartment RⅡ is higher than the set highest temperature t RⅡmax the three-way valve 108 is in state 1, the refrigerating flow path switching mechanism 115 is in state 2 (the state of being connected to the refrigerating branch), the secondary refrigerating flow path switching mechanism 116 is in state 1 (the state of being connected to the secondary refrigerating evaporator 114), the fan corresponding to the secondary refrigerating evaporator 114 starts, and the fans corresponding to the refrigerating evaporator, the variable-temperature evaporator, and the freezing evaporator stop. The fluid rich in low-boiling refrigerant passes through the second throttling device 109 for throttling and then directly enters the secondary refrigerating evaporator 114 to absorb heat, and then returns to the compressor through the check valve 107 and the regenerator 105. Until it is monitored that the temperature t of the secondary cold storage compartment RⅡ is lower than the set lowest temperature t RⅡmin the fan corresponding to the secondary refrigerating evaporator stops.

[0140] When it is monitored that the temperature t of the primary cold storage compartment RⅠ is higher than the set highest temperature t RⅠmax and the temperature t of the secondary cold storage compartment RⅡ is higher than the set highest temperature t RⅡmaxWhen the three-way valve 108 is in state 1, the refrigerated flow path switching mechanism 115 is in state 1, the secondary refrigerated flow path switching mechanism 116 is in state 1, the fans corresponding to the refrigerated evaporator and the secondary refrigerated evaporator are started, the fans corresponding to the variable temperature evaporator and the freezer evaporator are stopped, and the fluid rich in low-boiling refrigerant is throttled by the second throttling device 109 and then enters the refrigerated evaporator 110 and the secondary refrigerated evaporator 114 in sequence to absorb heat, and then returns to the compressor through the check valve 107 and the regenerator 105. Until the temperature t of the first-level refrigerating chamber RⅠ is lower than the set minimum temperature t RⅠmin , and the temperature t of the second-level refrigerating chamber RⅡ is lower than the set minimum temperature t RⅡmin , the fans corresponding to the refrigerated evaporator and the secondary refrigerated evaporator are stopped.

[0141] When it is monitored that the temperature of the first-level refrigerating chamber is lower than the set minimum temperature t RⅠmin and the temperature of the second-level refrigerating chamber is lower than the set minimum temperature t RⅡmin , the temperature t of the freezer F is higher than the set maximum temperature t Fmax , and the temperature t of the variable temperature chamber V is lower than the set minimum temperature t Vmin , the three-way valve 108 is in state 2, the freezer flow path switching mechanism 117 is in state 1 (the state of being connected to the freezer evaporator), the variable temperature flow path switching mechanism 118 is in state 2 (the state of being connected to the variable temperature branch), the fan corresponding to the freezer evaporator is started, and the fans corresponding to the refrigerated evaporator, the variable temperature evaporator, and the secondary refrigerated evaporator are stopped. The fluid rich in low-boiling refrigerant is throttled by the third throttling device 111 and then enters the freezer evaporator 112 to absorb heat, and then returns to the compressor through the check valve 107 and the regenerator 105. When the temperature t of the freezer F is lower than the set minimum temperature t Fmin , the fan corresponding to the freezer evaporator is stopped.

[0142] When it is monitored that the temperature of the first-level refrigerating chamber is lower than the set minimum temperature t RⅠmin and the temperature of the second-level refrigerating chamber is lower than the set minimum temperature t RⅡmin , the temperature t of the freezer F is lower than the set maximum temperature t Fmin , the temperature t of the variable temperature chamber V is higher than the set minimum temperature t VmaxWhen the first flow path switching mechanism 108 is in state 2, the refrigerating flow path switching mechanism 117 is in state 2 (the state of being connected to the refrigerating branch), the variable temperature flow path switching mechanism 118 is in state 1 (the state of being connected to the variable temperature evaporator), the fan corresponding to the variable temperature evaporator starts, and the fans corresponding to the refrigerating evaporator, the freezing evaporator, and the secondary refrigerating evaporator stop. The fluid rich in low-boiling refrigerant is throttled by the third throttling device 111 and then enters the variable temperature evaporator 113 to absorb heat, and then returns to the compressor through the check valve 107 and the regenerator 105. When the temperature t of the variable temperature compartment V is lower than the set minimum temperature t Vmin , the fan corresponding to the variable temperature evaporator stops.

[0143] When it is monitored that the temperature of the first-level refrigerating compartment is lower than the set minimum temperature t RⅠmin and the temperature of the secondary refrigerating compartment is lower than the set minimum temperature t RⅡmin , and the temperature t of the freezing compartment F is higher than the set maximum temperature t Fmax , and the temperature t of the variable temperature compartment V is higher than the set minimum temperature t Vmax , the first flow path switching mechanism 108 is in state 2, the refrigerating flow path switching mechanism 117 is in state 1, the variable temperature flow path switching mechanism 118 is in state 1, the fans corresponding to the freezing evaporator and the variable temperature evaporator start, and the fans corresponding to the refrigerating evaporator and the secondary refrigerating evaporator stop. The fluid rich in low-boiling refrigerant is throttled by the third throttling device 111 and then enters the freezing evaporator 112 and the variable temperature evaporator 113 in sequence to absorb heat, and then returns to the compressor through the check valve 107 and the regenerator 105. Until the temperature t of the freezing compartment F is lower than the lowest set temperature t Fmin , and the temperature t of the variable temperature compartment V is lower than the set minimum temperature t Vmin , the fans corresponding to the freezing evaporator and the variable temperature evaporator stop.

[0144] With priority control for the refrigerating compartment.

[0145] During the temperature reduction process of the freezing compartment and the variable temperature compartment, the temperature of the refrigerating compartment is continuously monitored. Once the temperature t of the first-level refrigerating compartment RⅠ is higher than the set maximum temperature t RⅠmax or the temperature t of the secondary refrigerating compartment RⅡ is higher than the set maximum temperature t RⅡmax , the three-way valve 108 switches to state 1.

[0146] Embodiment 3

[0147] This embodiment includes three parallel evaporators, including three low-temperature storage compartments corresponding to the three evaporators. Of course, the number of evaporator flow paths can be determined according to actual requirements.

[0148] Specifically, this embodiment includes a refrigerating evaporator 110, a freezing evaporator 112, and a variable-temperature evaporator 113. The refrigerating evaporator 110 corresponds to the refrigerating compartment, the freezing evaporator 112 corresponds to the freezing compartment, and the variable-temperature evaporator 113 corresponds to the variable-temperature compartment.

[0149] As Figure 6 shown, the first flow path switching mechanism of this embodiment includes a two-stage three-way valve, specifically including a first-stage three-way valve 120 and a second-stage three-way valve 121. The inlet of the first-stage three-way valve 120 is connected to the first pipeline outlet of the regenerator 105. The first outlet of the first-stage three-way valve 120 is connected to the inlet flow path of the refrigerating evaporator. The second outlet of the first-stage three-way valve 120 is connected to the inlet of the second-stage three-way valve 121. The first outlet of the second-stage three-way valve 121 is connected to the inlet flow path of the freezing evaporator. The second outlet of the second-stage three-way valve 121 is connected to the inlet flow path of the variable-temperature evaporator.

[0150] A controller is used to control the compressor and the first flow path switching mechanism. Specifically, the controller controls the start, stop, and operating frequency of the compressor according to the relationship between the set temperature of the low-temperature storage compartment and the actual temperature detected by the temperature detection module, controls the first-stage three-way valve 120 to be connected to the inlet flow path of the refrigerating evaporator or to the second-stage three-way valve 121, and controls the second-stage three-way valve 121 to be connected to the inlet flow path of the freezing evaporator or the inlet flow path of the variable-temperature evaporator.

[0151] The controller is used to control the blower corresponding to the evaporator to start when the actual temperature of the low-temperature storage compartment corresponding to the evaporator is higher than the highest set temperature; the controller is used to control the blower corresponding to the evaporator to stop when the actual temperature of the low-temperature storage compartment corresponding to the evaporator is lower than the lowest set temperature.

[0152] Specifically, the working process of the refrigeration equipment is as follows:

[0153] When it is monitored that the temperature t of the refrigerating compartment R is higher than the set highest temperature t Rmax , the first-stage three-way valve 120 is in state 1 (the state of being connected to the inlet flow path of the refrigerating evaporator). The blower corresponding to the refrigerating evaporator 110 starts, and the blowers corresponding to the freezing evaporator 112 and the variable-temperature evaporator 113 stop. The fluid rich in low-boiling refrigerant passes through the second throttling device 109 and then enters the refrigerating evaporator 110 to absorb heat, and then returns to the compressor through the check valve 107 and the regenerator 105. Until it is monitored that the temperature t of the refrigerating compartment R is lower than the set lowest temperature t Rmin , the blower corresponding to the refrigerating evaporator 110 stops.

[0154] When it is monitored that the temperature t of the refrigerating compartment R is lower than the set lowest temperature t Rmin and the temperature t of the freezing compartment FHigher than the set maximum temperature t Fmax When it is, the first three-way valve 120 is in state 2 (the state of being connected to the second three-way valve 121), the second three-way valve 121 is in state 1 (the state of being connected to the flow path of the freezing evaporator), the fan corresponding to the freezing evaporator 112 starts, the fans corresponding to the refrigerating evaporator 110 and the variable-temperature evaporator 113 stop, and the fluid rich in low-boiling refrigerant is throttled by the third throttling device 111 and then enters the freezing evaporator 112 to absorb heat, and then returns to the compressor through the check valve 107 and the regenerator 105. Until the temperature t of the freezer is monitored F Lower than the set minimum temperature t Fmin When it is, the fan corresponding to the freezing evaporator stops.

[0155] When the temperature t of the refrigerating chamber is monitored R Lower than the set minimum temperature t Rmin , the temperature t of the freezer F Lower than the set minimum temperature t Fmin , and when the temperature t of the variable-temperature chamber is monitored V Higher than the set maximum temperature t Vmax When it is, the first three-way valve 120 is in state 2, the second three-way valve 121 is in state 2 (the state of being connected to the inlet flow path of the variable-temperature evaporator), the fan corresponding to the variable-temperature evaporator 113 starts, the fans corresponding to the refrigerating evaporator and the freezing evaporator stop, and the fluid rich in low-boiling refrigerant is throttled by the third throttling device 119 and then enters the variable-temperature evaporator 113 to absorb heat, and then returns to the compressor through the check valve 107 and the regenerator 105. Until the temperature t of the variable-temperature chamber V Lower than the minimum set temperature t Vmin , the fan corresponding to the variable-temperature evaporator stops.

[0156] With the refrigerating chamber being controlled with priority, followed by the freezer. During the temperature reduction process of the freezer and the variable-temperature chamber, the temperature t of the refrigerating chamber is continuously monitored R , once the temperature t of the refrigerating chamber R Higher than the set maximum temperature t Rmax , the first three-way valve 120 switches to state 1. When the temperature of the refrigerating chamber meets the requirements, and the temperatures t F 、t V of the freezer and the variable-temperature chamber are both higher than the set maximum temperature t Fmax 、t Vmax When it is, the freezer refrigerates with priority.

[0157] In the description of the above embodiments, the specific features, structures, materials or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0158] The above are only specific embodiments of the present invention, but the protection scope of the present invention 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 invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A refrigeration device, comprising: A low-temperature storage chamber and a refrigeration system for supplying cold to the low-temperature storage chamber; A temperature detection module located in the low-temperature storage chamber, which is used to detect the temperature of the low-temperature storage chamber and transmit the temperature signal to the controller; It is characterized in that The refrigeration system includes: A compressor connected with a compressor inlet flow path and a compressor outlet flow path; A first condenser connected to the compressor outlet flow path and connected with a first condenser outlet flow path; A gas-liquid separator connected to the first condenser outlet flow path and connected with a gas-liquid separator gaseous outlet flow path and a gas-liquid separator liquid outlet flow path; A second condenser connected to the gas-liquid separator gaseous outlet flow path and connected with a second condenser outlet flow path; At least two evaporators connected in parallel, the inlet and outlet of each evaporator are respectively connected with an evaporator inlet flow path and an evaporator outlet flow path, and a throttling device is arranged on the evaporator inlet flow path; A regenerator, including a first pipeline and a second pipeline that perform heat exchange with each other, the inlet of the first pipeline is connected to the second condenser outlet flow path, the outlet of the first pipeline is connected to a first flow path switching mechanism, the outlet of the second pipeline is connected to the compressor inlet flow path, the inlet of the second pipeline is connected to the evaporator outlet flow path, and the gas-liquid separator liquid outlet flow path is connected between the evaporator outlet flow path and the inlet of the second pipeline through a first throttling device; A check valve for preventing the refrigerant from flowing back into the evaporator is arranged on the evaporator outlet flow path; A first flow path switching mechanism, the first flow path switching mechanism is connected to several evaporator inlet flow paths, and the first flow path switching mechanism is used to controllably switch the evaporator inlet flow path into which the refrigerant enters; A controller, which controls the first flow path switching mechanism according to the relationship between the set temperature of the low-temperature storage chamber and the actual temperature detected by the temperature detection module.

2. The refrigeration device according to claim 1, characterized in that, The evaporator includes a refrigerated evaporator and a frozen evaporator connected in parallel with each other, the refrigerated evaporator is used to provide cold to the refrigerated chamber, and the frozen evaporator is used to provide cold to the freezer; The first flow path switching mechanism is used to controllably switch the flow direction of the refrigerant to preferentially flow to the refrigerated evaporator when both the refrigerated chamber and the freezer need refrigeration.

3. The refrigeration device according to claim 2, characterized in that The evaporator further includes a variable-temperature evaporator, and the variable-temperature evaporator is used to provide cold to the variable-temperature chamber; The variable-temperature evaporator is connected in series with the frozen evaporator, and the inlet of the variable-temperature evaporator is connected to the outlet of the frozen evaporator.

4. The refrigeration device according to claim 3, characterized in that, The refrigeration system further includes: A frozen branch and / or a variable-temperature branch; wherein the frozen branch is connected in parallel with the frozen evaporator, and the variable-temperature branch is connected in parallel with the variable-temperature evaporator; A frozen flow path switching mechanism for controllably switching the refrigerant flow to the frozen branch or the frozen evaporator; A variable-temperature flow path switching mechanism for controllably switching the refrigerant flow to the variable-temperature branch or the variable-temperature evaporator.

5. The refrigeration device according to claim 4, characterized in that The refrigeration flow path switching mechanism is used to controllably switch the refrigerant flow to the refrigeration evaporator when the freezer needs refrigeration, and controllably switch the refrigerant flow to the refrigeration branch when the freezer does not need refrigeration; The variable temperature flow path switching mechanism is used to controllably switch the refrigerant flow to the variable temperature evaporator when the variable temperature compartment needs refrigeration, and controllably switch the refrigerant flow to the variable temperature branch when the variable temperature compartment does not need refrigeration.

6. The refrigeration device according to claim 2, characterized in that, The refrigeration system further includes: A secondary fresh food evaporator, which is used to provide cold for the secondary fresh food compartment. The secondary fresh food evaporator is connected in series with the fresh food evaporator, and the inlet of the secondary fresh food evaporator is connected to the outlet of the fresh food evaporator.

7. The refrigeration device according to claim 6, characterized in that, The refrigeration system further includes: A fresh food branch and / or a secondary fresh food branch; wherein, the fresh food branch is connected in parallel with the fresh food evaporator, and the secondary fresh food branch is connected in parallel with the secondary fresh food evaporator; A fresh food flow path switching mechanism, which is used to controllably switch the refrigerant flow to the fresh food branch or the fresh food evaporator; A secondary fresh food flow path switching mechanism, which is used to controllably switch the refrigerant flow to the secondary fresh food branch or the secondary fresh food evaporator.

8. The refrigeration device according to claim 7, wherein The fresh food flow path switching mechanism is used to controllably switch the refrigerant flow to the fresh food evaporator when the fresh food compartment needs refrigeration, and controllably switch the refrigerant flow to the fresh food branch when the fresh food compartment does not need refrigeration; The secondary fresh food flow path switching mechanism is used to controllably switch the refrigerant flow to the secondary fresh food evaporator when the secondary fresh food compartment needs refrigeration; It is used to controllably switch the refrigerant flow to the secondary fresh food branch when the secondary fresh food compartment does not need refrigeration.

9. The refrigeration device according to any one of claims 1-8, characterized in that The refrigeration device includes a blower corresponding to the evaporator, and the blower is used to be started controllably when the refrigerant flows through the evaporator.

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