A refrigeration device

Abstract

The present invention relates to a refrigeration device, including a first flow path switching mechanism, a second flow path switching mechanism, a variable temperature flow path switching mechanism and / or a freezing flow path switching mechanism, through which the evaporator through which the refrigerant flows is selected, thereby refrigerating the low-temperature storage chambers corresponding to different evaporators, realizing different temperature requirements of different low-temperature storage chambers, realizing the difference in temperature requirements of multiple temperature zones, and meeting the storage requirements of various foods. The present invention can realize independent control of the temperature of each low-temperature storage chamber, with high temperature control accuracy, can realize multi-temperature zone refrigeration and deep low temperature refrigeration, can increase the unit refrigeration capacity, and reduce throttling losses.

Description

Technical Field

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

[0002] With the development of the times, people's quality of life has gradually improved, and their health awareness has been continuously enhanced. Different foods can only be kept fresh and have less nutrient loss when stored at the right temperature, thus improving food quality and safety. Therefore, when choosing a refrigerator, people's requirements for refrigerator freshness are constantly increasing, requiring refrigerators to provide multiple temperature zones to meet the requirements of a healthier food storage method.

[0003] In order to achieve multiple temperature ranges, the following solutions are mainly used in the existing refrigeration cycle:

[0004] 1. Using multiple independent compression refrigeration circuits will increase costs and is uneconomical.

[0005] 2. Providing cooling capacity to multiple evaporators in series or parallel at a single evaporation temperature at the same time. This method will increase the heat transfer temperature difference in the high-temperature area, increase the irreversible heat transfer loss, and when a room does not need cooling, the refrigerant will still flow through the evaporator of the room, increasing the cooling loss.

[0006] 3. Utilizing the non-isothermal characteristics of phase change of non-azeotropic mixed refrigerant under constant pressure, the non-azeotropic mixed refrigerant is divided into a fluid rich in high-boiling-point refrigerant and a fluid rich in low-boiling-point refrigerant, and then enters two or more evaporators connected in series or parallel for refrigeration. This method also provides cooling to multiple compartments at the same time at a single evaporation temperature. At the same time, after the compressor of this method is started, all evaporators are in operation and the evaporator pressure is the same. The temperature of each compartment can only be adjusted by adjusting the fan speed or controlling the start and stop. The temperature control accuracy is not high enough, and the temperature difference between different temperature zones is small, so it is impossible to achieve a very low refrigeration temperature and cannot meet the storage requirements of some special foods. Summary of the invention

[0007] In order to solve the technical problems in the prior art that after the compressor is started, all evaporators are refrigerated at the same time, the refrigeration flow path cannot be switched, and the temperature difference between different temperature zones is small, the present invention provides a refrigeration device, which can select the corresponding evaporator for refrigeration after the compressor of the refrigeration system is started, and multiple temperature zones with large temperature differences can be achieved to meet the storage requirements of various foods.

[0008] To achieve the above object, the present invention adopts the following technical solution: The present invention provides a refrigeration device, comprising:

[0009] A low-temperature storage room and a refrigeration system for supplying cold to the low-temperature storage room;

[0010] The refrigeration system comprises:

[0011] A compressor connected to a compressor inlet flow path and a compressor outlet flow path;

[0012] a first condenser connected to the compressor outlet flow path and connected to a first condenser outlet flow path;

[0013] A gas-liquid separator connected to the first condenser outlet flow path, and connected to a gas-liquid separator gaseous outlet flow path and a gas-liquid separator liquid outlet flow path;

[0014] a second condenser connected to the gaseous outlet flow path of the gas-liquid separator and connected to a second condenser outlet flow path;

[0015] A regenerator, comprising a first pipeline and a second throttling pipeline for heat exchange with each other, wherein the first pipeline outlet is connected to the compressor inlet flow path, and the second throttling pipeline comprises a second throttling pipeline inlet flow path and a second throttling pipeline outlet flow path;

[0016] A refrigerated evaporator, wherein the inlet and the outlet of the refrigerated evaporator are respectively connected to the refrigerated evaporator inlet flow path and the refrigerated evaporator outlet flow path, wherein a first throttling device is provided on the refrigerated evaporator inlet flow path, and the refrigerated evaporator outlet flow path is connected to the first pipeline inlet;

[0017] A refrigeration evaporator and a temperature-variable evaporator connected in series;

[0018] A refrigeration evaporator connected to the outlet flow path of the second throttling pipeline;

[0019] A variable temperature evaporator is connected to a variable temperature evaporator outlet flow path, wherein the variable temperature evaporator outlet flow path is connected to the first pipeline inlet of the regenerator;

[0020] It also includes a freezing branch and / or a temperature-changing branch; wherein the freezing branch is connected in parallel to the freezing evaporator, and the temperature-changing branch is connected in parallel to the temperature-changing evaporator;

[0021] A freezing flow path switching mechanism, used for controlled switching of the refrigerant flow to the freezing branch or the freezing evaporator;

[0022] A temperature-variable flow path switching mechanism, used for controlled switching of the refrigerant flow to the temperature-variable branch or the temperature-variable evaporator;

[0023] a first flow path switching mechanism, the first flow path switching mechanism connecting the liquid outlet flow path of the gas-liquid separator, the refrigeration evaporator inlet flow path and the second throttling pipeline inlet flow path, the first flow path switching mechanism being used for controlled switching of the flow direction of the refrigerant;

[0024] The second flow path switching mechanism connects the second condenser outlet flow path, the gas-liquid separator liquid outlet flow path and the regenerator second throttling pipe inlet flow path, and the second flow path switching mechanism is used for controlled switching of the refrigerant flow direction.

[0025] 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, a second flow path switching mechanism, a variable temperature flow path switching mechanism and / or a freezing flow path switching mechanism, and the evaporator through which the refrigerant flows is selected by the first flow path switching mechanism, the second flow path switching mechanism, the variable temperature flow path switching mechanism and / or the freezing flow path switching mechanism, so as to refrigerate the low-temperature storage chambers corresponding to different evaporators, realize the different temperature requirements of different low-temperature storage chambers, realize the different temperature requirements of multiple temperature zones, and meet the storage requirements of various foods. The present invention can realize independent control of the temperature of each low-temperature storage chamber, with high temperature control accuracy, can realize multi-temperature zone refrigeration and deep low temperature refrigeration, can increase the unit refrigeration capacity, and reduce throttling losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 This is a control block diagram of a refrigeration device according to an embodiment of the present invention.

[0028] Figure 2 The figure is a schematic diagram of a refrigeration system of a refrigeration device according to an embodiment of the present invention.

[0029] Figure 3 This is a control block diagram of a refrigeration device according to Embodiment 2 of the present invention.

[0030] Figure 4 This is a schematic diagram of a refrigeration system of a refrigeration device according to a second embodiment of the present invention.

[0031] Reference numerals:

[0032] 101-compressor; 102-first condenser; 103-gas-liquid separator; 104-second condenser; 105-second three-way valve; 106-first three-way valve; 107-first throttling device; 108-refrigerated evaporator; 109-second throttling device; 110-first check valve; 11-regenerator; 111-second throttling pipeline; 1111-first pipeline; 112-second check valve; 113-frozen evaporator; 114-third three-way valve; 115-variable temperature evaporator; 116-sixth three-way valve; 117-fifth three-way valve; 118-fourth three-way valve; 119-secondary refrigerated evaporator. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0036] A refrigeration device, comprising:

[0037] A low temperature storage room and a refrigeration system for supplying cold to the low temperature storage room;

[0038] The refrigeration system includes:

[0039] A compressor connected to a compressor inlet flow path and a compressor outlet flow path;

[0040] a first condenser connected to the compressor outlet flow path and connected to a first condenser outlet flow path;

[0041] A gas-liquid separator is connected to the outlet flow path of the first condenser and is connected to a gas-liquid separator gas outlet flow path and a gas-liquid separator liquid outlet flow path;

[0042] a second condenser connected to the gaseous outlet flow path of the gas-liquid separator and connected to a second condenser outlet flow path;

[0043] The regenerator comprises a first pipeline and a second throttling pipeline for heat exchange with each other, the first pipeline outlet is connected to the compressor inlet flow path, and the second throttling pipeline comprises a second throttling pipeline inlet flow path and a second throttling pipeline outlet flow path;

[0044] A refrigerated evaporator, wherein the inlet and the outlet of the refrigerated evaporator are respectively connected to the refrigerated evaporator inlet flow path and the refrigerated evaporator outlet flow path, a first throttling device is provided on the refrigerated evaporator inlet flow path, and the refrigerated evaporator outlet flow path is connected to the first pipeline inlet;

[0045] A refrigeration evaporator and a temperature-variable evaporator connected in series;

[0046] A refrigeration evaporator connected to the outlet flow path of the second throttling pipeline;

[0047] The variable temperature evaporator is connected to an outlet flow path of the variable temperature evaporator, and the outlet flow path of the variable temperature evaporator is connected to the inlet of the first pipeline of the regenerator;

[0048] It also includes a freezing branch and / or a temperature-changing branch; wherein the freezing branch is connected in parallel to the freezing evaporator, and the temperature-changing branch is connected in parallel to the temperature-changing evaporator;

[0049] A refrigeration flow path switching mechanism, used for controlled switching of the refrigerant flow to the refrigeration branch or the refrigeration evaporator;

[0050] A temperature-variable flow path switching mechanism, used for controlled switching of the refrigerant flow to the temperature-variable branch or the temperature-variable evaporator;

[0051] A first flow path switching mechanism, the first flow path switching mechanism is connected to the liquid outlet flow path of the gas-liquid separator, the inlet flow path of the refrigeration evaporator and the inlet flow path of the second throttling pipeline, and the first flow path switching mechanism is used for controlled switching of the flow direction of the refrigerant;

[0052] The second flow path switching mechanism connects the second condenser outlet flow path, the gas-liquid separator liquid outlet flow path and the regenerator second throttling pipe inlet flow path, and the second flow path switching mechanism is used for controlled switching of the refrigerant flow direction.

[0053] The refrigeration evaporator is used to provide cooling to the refrigeration room, the freezing evaporator is used to provide cooling to the freezing room, and the variable temperature evaporator is used to provide cooling to the variable temperature room;

[0054] The first flow path switching mechanism is used to control the flow direction of the refrigerant to flow to the refrigeration evaporator preferentially when the refrigeration chamber, the freezing chamber and the temperature-changing chamber all need refrigeration.

[0055] The freezing flow path switching mechanism is used to control the refrigerant to flow to the freezing evaporator when the freezing chamber needs to be refrigerated, and to control the refrigerant to flow to the freezing branch when the freezing chamber does not need to be refrigerated;

[0056] 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 to be cooled, and to controllably switch the refrigerant flow to the variable temperature branch when the variable temperature chamber does not need to be cooled.

[0057] In some embodiments, the refrigeration system further comprises:

[0058] The secondary refrigeration evaporator is used to provide cooling capacity for the secondary refrigeration chamber. The secondary refrigeration evaporator is connected in series to the refrigeration evaporator. The inlet of the secondary refrigeration evaporator is connected to the outlet of the refrigeration evaporator.

[0059] In some embodiments, the refrigeration system further comprises:

[0060] A refrigeration branch and / or a secondary refrigeration branch, wherein the refrigeration branch is connected in parallel to the refrigeration evaporator, and the secondary refrigeration branch is connected in parallel to the secondary refrigeration evaporator;

[0061] A refrigeration flow path switching mechanism, used for controlled switching of the refrigerant flow to the refrigeration branch or the refrigeration evaporator;

[0062] The secondary refrigeration flow path switching mechanism is used for controlled switching of the refrigerant flow to the secondary refrigeration branch or the secondary refrigeration evaporator.

[0063] The refrigeration flow path switching mechanism is used to controllably switch the refrigerant flow to the refrigeration evaporator when the refrigeration chamber needs refrigeration, and controllably switch the refrigerant flow to the refrigeration branch when the refrigeration chamber does not need refrigeration;

[0064] The secondary refrigeration flow path switching mechanism is used to controllably switch the refrigerant flow to the secondary refrigeration evaporator when the secondary refrigeration chamber needs refrigeration; and is used to controllably switch the refrigerant flow to the secondary refrigeration branch when the secondary refrigeration chamber does not need refrigeration.

[0065] Preferably, the secondary refrigeration flow path switching mechanism is used to control the switching of the flow direction of the refrigerant to preferentially flow to the refrigeration evaporator when both the refrigeration chamber and the secondary refrigeration chamber need refrigeration.

[0066] A check valve is provided on the evaporator outlet flow path to prevent the refrigerant from flowing back to the evaporator.

[0067] In some embodiments, the refrigeration device includes a fan corresponding to the evaporator, and the fan is controlled to start when the refrigerant flows through the evaporator.

[0068] The refrigeration equipment uses a mixed refrigerant, which includes two refrigerants with different boiling points.

[0069] Embodiment 1

[0070] like Figure 1 As shown, the refrigeration equipment includes a box body with a low-temperature storage room, a temperature detection module for detecting the temperature of the low-temperature storage room, a controller and a refrigeration system. The number of low-temperature storage rooms matches the number of evaporators in the refrigeration system, and the evaporator is used to provide cold air to the low-temperature storage room.

[0071] In this embodiment, there are a refrigerating chamber corresponding to the refrigerating evaporator 108, a freezing chamber corresponding to the freezing evaporator 113, and a variable temperature chamber corresponding to the variable temperature evaporator 115. The refrigerating evaporator is used to provide cooling to the refrigerating chamber, the freezing evaporator is used to provide cooling to the freezing chamber, and the variable temperature evaporator is used to provide cooling to the variable temperature chamber.

[0072] The temperature detection module is located in the low-temperature storage room. A temperature detection module is installed in each low-temperature storage room. The temperature detection module is used to detect the temperature of the low-temperature storage room and transmit the temperature signal to the controller.

[0073] The controller is used to control the compressor, the first flow path switching mechanism, the second flow path switching mechanism, the variable temperature flow path switching mechanism and the fan corresponding to the evaporator.

[0074] The refrigeration system is described in detail below:

[0075] like Figure 2 As shown, the refrigeration system of this embodiment includes:

[0076] 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.

[0077] 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 the first condenser outlet flow path.

[0078] 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 the gas-liquid separator gaseous outlet flow path, and the liquid outlet is connected to the gas-liquid separator liquid outlet flow path.

[0079] The second condenser 104 includes a second condenser inlet and a second condenser outlet. The second condenser inlet is connected to the gaseous outlet flow path of the gas-liquid separator, and the second condenser outlet is connected to the second condenser outlet flow path.

[0080] The regenerator 11 includes a first pipeline 1111 and a second throttling pipeline 111 for performing heat exchange with each other. The first pipeline 1111 includes a first pipeline inlet and a first pipeline outlet, and the first pipeline outlet is connected to the compressor inlet flow path. The second throttling pipeline 111 includes a second throttling pipeline inlet and a second throttling pipeline outlet, the second throttling pipeline inlet is connected to the second throttling pipeline inlet flow path, and the second throttling pipeline outlet is connected to the second throttling pipeline outlet flow path.

[0081] The refrigerated evaporator 108 includes a refrigerated evaporator inlet and a refrigerated evaporator outlet. The refrigerated evaporator inlet is connected to a refrigerated evaporator inlet flow path, the refrigerated evaporator outlet is connected to a refrigerated evaporator outlet flow path, and the refrigerated evaporator outlet flow path is connected to the first pipeline inlet. The refrigerated evaporator inlet flow path is connected to a first throttling device 107, and the refrigerated evaporator outlet flow path is connected to a second throttling device 109.

[0082] The freezing evaporator 113 and the temperature variable evaporator 115 are connected in series.

[0083] The refrigeration evaporator 113 includes a refrigeration evaporator inlet and a refrigeration evaporator outlet. The refrigeration evaporator inlet is connected to the outlet flow path of the second throttling pipeline.

[0084] The variable temperature evaporator 115 includes a variable temperature evaporator inlet and a variable temperature evaporator outlet. The variable temperature evaporator outlet is connected to a variable temperature evaporator outlet flow path, and the variable temperature evaporator outlet flow path is connected to the first pipeline inlet of the regenerator.

[0085] The temperature-variable branch is connected to the temperature-variable evaporator 115 and includes a temperature-variable branch inlet and a temperature-variable branch outlet. The temperature-variable branch outlet is connected to the temperature-variable evaporator outlet.

[0086] The first flow path switching mechanism connects the liquid outlet flow path of the gas-liquid separator 103, the refrigeration evaporator inlet flow path, and the second throttling pipeline inlet flow path, and the first flow path switching mechanism is used to control the flow direction of the refrigerant. In this embodiment, the first flow path switching mechanism includes a first three-way valve 106, the inlet of the first three-way valve 106 is connected to the liquid outlet flow path of the gas-liquid separator 103, the first outlet of the first three-way valve 106 is connected to the refrigeration evaporator inlet flow path, and the second outlet of the first three-way valve 106 is connected to the second throttling pipeline inlet flow path.

[0087] The second flow path switching mechanism connects the second condenser outlet flow path, the gas-liquid separator liquid outlet flow path, and the regenerator second throttling pipeline inlet flow path, and the second flow path switching mechanism is used to control the flow direction of the refrigerant. In this embodiment, the second flow path switching mechanism includes a second three-way valve 105, the inlet of the second three-way valve 105 is connected to the second condenser outlet flow path, the first outlet of the second three-way valve 105 is connected to the gas-liquid separator liquid outlet flow path, and the second outlet of the second three-way valve 105 is connected to the regenerator second throttling pipeline inlet flow path.

[0088] The temperature-variable flow path switching mechanism is connected to the outlet flow path of the freezing evaporator, to the inlet of the temperature-variable evaporator, and to the inlet of the temperature-variable branch, and is used for controlled switching of the refrigerant flow to the temperature-variable branch or the temperature-variable evaporator. In this embodiment, the temperature-variable flow path switching mechanism includes a third three-way valve 114, the inlet of the third three-way valve 114 is connected to the outlet flow path of the freezing evaporator, the first outlet of the third three-way valve 114 is connected to the inlet of the temperature-variable evaporator 115, and the second outlet of the third three-way valve 114 is connected to the inlet of the temperature-variable branch.

[0089] Of course, each three-way valve can also be replaced by two switch valves.

[0090] The controller is used to control the compressor, the first flow path switching mechanism, the second flow path switching mechanism and the variable temperature flow path switching mechanism. Specifically, the controller controls the start and stop and the 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 inlet of the three-way valve to be connected with the first outlet or the second outlet.

[0091] The refrigeration device includes a fan corresponding to the evaporator. The controller is used to control the start and stop of the fan. The fan is controlled to start when the refrigerant flows through the evaporator.

[0092] Check valves for preventing the refrigerant from flowing back to the evaporator are arranged on the refrigerated evaporator outlet flow path and the variable temperature evaporator outlet flow path. The refrigerated evaporator outlet flow path is connected to a first check valve 110, and the variable temperature evaporator outlet flow path is connected to a second check valve 112.

[0093] The refrigeration equipment uses a mixed refrigerant, which includes two refrigerants with different boiling points. A non-azeotropic mixed refrigerant is used as the refrigerant, and the phase change anisothermal characteristics and temperature glide characteristics of the non-azeotropic mixed refrigerant are utilized. This embodiment uses the phase change anisothermal characteristics of the non-azeotropic mixed refrigerant to divide the mixed refrigerant into two fluids. When all three storage rooms need to be cooled, the high-boiling point and low-boiling point refrigerants are separated and enter the high-temperature evaporator and the low-temperature evaporator. When only the freezing and variable temperature rooms need to be cooled, the mixed refrigerant first enters the freezing evaporator and then the variable temperature evaporator, utilizing the temperature glide characteristics of the mixed refrigerant.

[0094] The controller of this embodiment is used to control the first flow path switching mechanism, the second flow path switching mechanism and the variable temperature flow path switching mechanism to switch to a state where the refrigerant flows through the evaporator when the actual temperature of the storage chamber corresponding to the evaporator is higher than the set maximum temperature of the storage chamber. Specifically:

[0095] Check the temperature of all storage rooms;

[0096] If the detected temperature of the storage chamber corresponding to the evaporator is higher than the set maximum temperature of the storage chamber, the controller controls the first flow path switching mechanism, the second flow path switching mechanism and the variable temperature flow path switching mechanism to switch to a state in which the refrigerant flows through the evaporator.

[0097] The first flow path switching mechanism is used to control the flow direction of the refrigerant to flow to the refrigeration evaporator preferentially when the refrigeration chamber, the freezing chamber and the temperature-changing chamber all need refrigeration.

[0098] 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 to be cooled, and to controllably switch the refrigerant flow to the variable temperature branch when the variable temperature chamber does not need to be cooled.

[0099] The controller is used to control the fan corresponding to the evaporator to start when the actual temperature of the storage chamber corresponding to the evaporator is higher than the maximum set temperature; the controller is used to control the fan corresponding to the evaporator to stop when the actual temperature of the storage chamber corresponding to the evaporator is lower than the minimum set temperature.

[0100] When the refrigerator, freezer and temperature-controlled room all need cooling, the refrigerator temperature t R , Freezer temperature t F , variable temperature room t V All higher than the maximum temperature set in each compartment Rmax ,t Fmax ,t Vmax , the first three-way solenoid valve 106 is in state 1 (connected to the first throttling device 107), the second three-way solenoid valve 105 is in state 2 (connected to the second throttling pipeline 111), and the third three-way solenoid valve 114 is in state 1 (connected to the variable temperature evaporator 115). The refrigeration, freezing and variable temperature fans are all started. At this time, the gas rich in low-boiling-point refrigerant separated from the gas-liquid separator 103 is condensed by the second condenser 104 and throttled by the second throttling pipeline 111, and then enters the freezing evaporator 113 and the variable temperature evaporator 115 to absorb heat. The liquid rich in high-boiling-point refrigerant separated from the gas-liquid separator 103 is throttled by the first throttling device 107 and then enters the refrigeration evaporator 108 to absorb heat.

[0101] When the refrigerator and freezer require cooling and the temperature-controlled room does not require cooling, the refrigerator temperature t R , Freezer temperature t FHigher than the maximum temperature set in two compartments t Rmax ,t Fmax , variable room temperature t V Lower than the maximum temperature set in the variable temperature room t Vmax When the first three-way solenoid valve 106 is in state 1 (connected to the first throttling device 107), the second three-way solenoid valve 105 is in state 2 (connected to the second throttling pipeline 111), and the third three-way solenoid valve 114 is in state 2 (connected to the refrigeration branch), the refrigeration and freezing fans are started, and the variable temperature fan is stopped. The mixed refrigerant is separated into two fluids by the gas-liquid separator 103 for refrigeration respectively. The fluid rich in low-boiling-point refrigerant absorbs heat only in the freezing evaporator 113 and does not flow through the variable temperature evaporator 115.

[0102] When the refrigeration room and the temperature-changing room need cooling, and the freezer room does not need cooling, the refrigeration room temperature t R , variable temperature room t V Higher than the maximum temperature set in two compartments t Rmax ,t Vmax , freezer temperature t F Lower than the maximum temperature set for the freezer Fmax , the first three-way solenoid valve 106 is in state 1 (connected to the first throttling device 107), the second three-way solenoid valve 105 is in state 2 (connected to the second throttling pipeline 111), and the third three-way solenoid valve 114 is in state 1 (connected to the variable temperature evaporator 115). The refrigeration and variable temperature fans are started, and the freezing fan is stopped. The mixed refrigerant is separated into two fluids by the gas-liquid separator 103 for refrigeration respectively. The fluid rich in low boiling point refrigerant passes through the freezing evaporator 113 and the variable temperature evaporator 115 in turn. However, since the freezing fan is stopped, the freezing evaporator 113 and the air in the freezing compartment only undergo natural convection, and the heat exchange is small.

[0103] When the refrigeration room does not need cooling, the freezer and temperature-changing room need cooling, that is, the freezer temperature t F , variable temperature room t V Higher than the maximum temperature set in two compartments t Fmax ,t Vmax , Refrigerator temperature t R Lower than the maximum temperature set in the refrigerator Rmax, the first three-way solenoid valve 106 is in state 2 (connected to the second throttling pipeline 111), the second three-way solenoid valve 105 is in state 2 (connected to the second throttling pipeline 111), and the third three-way solenoid valve 114 is in state 1 (connected to the variable temperature evaporator 115). The freezing and variable temperature fans are started, and the refrigeration fan is stopped. The liquid rich in high-boiling point refrigerant separated from the gas-liquid separator 103 does not enter the refrigeration evaporator 108, but is remixed with the separated fluid rich in low-boiling point refrigerant and then enters the freezing evaporator 113 and the variable temperature evaporator 115 after throttling to absorb heat. At this time, the non-azeotropic mixed refrigerant has a temperature glide characteristic, which makes the refrigerant temperature passing through the freezing evaporator 113 lower than the refrigerant temperature passing through the variable temperature evaporator 115, thereby reducing the heat transfer temperature difference between the variable temperature evaporator 115 and the room air, and reducing irreversible losses.

[0104] When only the cold storage room needs cooling, the temperature of the cold storage room is monitored. R Higher than the maximum temperature set in the refrigerator Rmax , freezer temperature t F , variable temperature room t V Lower than the maximum temperature set for the two compartments t Fmax ,t Vmax When the first three-way solenoid valve 106 is in state 1 (connected to the first throttling device 107), the second three-way solenoid valve 105 is in state 1 (connected to the first three-way valve 106), the refrigeration fan starts, the freezing and variable temperature fans stop, and the gas rich in low-boiling-point refrigerant separated from the gas-liquid separator 103 is condensed by the second condenser 104 and remixed with the separated liquid rich in high-boiling-point refrigerant, and then enters the refrigeration evaporator 108 after throttling to absorb heat.

[0105] When only the freezer compartment needs cooling, the freezer compartment temperature t F Higher than the maximum temperature set in the freezer Fmax , Refrigerator temperature t R , variable temperature room t V Lower than the maximum temperature set for the two compartments t Rmax ,t Vmax When the first three-way solenoid valve 106 is in state 2 (connected to the second throttling pipeline 111), the second three-way solenoid valve 105 is in state 2 (connected to the second throttling pipeline 111), the third three-way solenoid valve 114 is in state 2 (connected to the refrigeration branch), the refrigeration fan starts, the refrigeration and variable temperature fans stop, and the mixed refrigerant is separated and remixed to enter the refrigeration evaporator 113 to absorb heat.

[0106] When only the variable temperature room needs cooling, the temperature of the variable temperature room t V Higher than the maximum temperature set in the variable temperature room t Vmax , Refrigerator temperature tR , Freezer temperature t F Lower than the maximum temperature set for the two compartments t Rmax ,t Fmax When the temperature is regulated by the temperature-variable evaporator 115, the first three-way solenoid valve 106 is in state 2 (connected to the second throttling pipeline 111), the second three-way solenoid valve 105 is in state 2 (connected to the second throttling pipeline 111), and the third three-way solenoid valve 114 is in state 1 (connected to the variable temperature evaporator 115). The variable temperature fan starts, and the refrigerating and freezing fans stop. The mixed refrigerant is separated and remixed to enter the freezing evaporator 113 and the variable temperature evaporator 115 in turn. However, the freezing evaporator 113 and the air in the freezing compartment only undergo natural convection.

[0107] During the cooling process of the freezing room and the variable temperature room, the temperature of the cold storage room is constantly monitored. R Once the refrigerator temperature t R Higher than the set maximum temperature t Rmax , the first three-way valve 106 is switched to state 1 connected to the refrigeration evaporator.

[0108] When the temperatures of the three compartments are within the set temperature range, the compressor stops and the fan stops.

[0109] State 1 refers to a state in which the inlet of the three-way solenoid valve is connected to the first outlet, and state 2 refers to a state in which the inlet of the three-way solenoid valve is connected to the second outlet.

[0110] This embodiment can realize independent control of the temperature of the three compartments, and can realize cooling of the three compartments at the same time, cooling of any two compartments at the same time, and cooling of a single compartment separately. When some compartments do not need to be cooled, it is relatively easy to prevent the refrigerant from flowing through the evaporator of the compartment, thereby reducing losses and energy consumption.

[0111] Of course, in this embodiment, a freezing branch can be connected in parallel to the freezing evaporator, a freezing flow path switching mechanism can be added, and the branch connected in parallel to the variable temperature evaporator and the variable temperature flow path switching mechanism can be cancelled.

[0112] Embodiment 2

[0113] The difference between this embodiment and the first embodiment is that this embodiment adds an evaporator on the basis of the first embodiment.

[0114] like Figure 3As shown, this embodiment includes four evaporators, and the four evaporators correspond to four low-temperature storage chambers, specifically including a refrigerating chamber corresponding to the refrigerating evaporator 108, a freezing chamber corresponding to the freezing evaporator 113, a variable temperature chamber corresponding to the variable temperature evaporator 115, and a secondary refrigerating chamber corresponding to the secondary refrigerating evaporator 119. The refrigerating evaporator is used to provide cooling to the refrigerating chamber, the freezing evaporator is used to provide cooling to the freezing chamber, the variable temperature evaporator is used to provide cooling to the variable temperature chamber, and the secondary refrigerating evaporator is used to provide cooling to the secondary refrigerating chamber.

[0115] like Figure 4 As shown, the refrigeration equipment of this embodiment includes:

[0116] The temperature-variable branch is connected to the temperature-variable evaporator 115 and includes a temperature-variable branch inlet and a temperature-variable branch outlet. The temperature-variable branch outlet is connected to the temperature-variable evaporator outlet.

[0117] The temperature-variable flow path switching mechanism is connected to the outlet flow path of the freezing evaporator, to the inlet of the temperature-variable evaporator, and to the inlet of the temperature-variable branch, and is used for controlled switching of the refrigerant flow to the temperature-variable branch or the temperature-variable evaporator. In this embodiment, the temperature-variable flow path switching mechanism includes a third three-way valve 114, the inlet of the third three-way valve 114 is connected to the outlet flow path of the freezing evaporator, the first outlet of the third three-way valve 114 is connected to the inlet of the temperature-variable evaporator 115, and the second outlet of the third three-way valve 114 is connected to the inlet of the temperature-variable branch.

[0118] A freezing branch is connected in parallel to the freezing evaporator 113, comprising a freezing branch inlet and a freezing branch outlet, wherein the freezing branch outlet is connected to the freezing evaporator outlet flow path;

[0119] The freezing flow path switching mechanism is connected to the second throttling pipeline outlet flow path, connected to the freezing evaporator inlet, and connected to the freezing branch inlet. The freezing flow path switching mechanism is used to controllably switch the refrigerant flow to the freezing branch or the freezing evaporator. The freezing flow path switching mechanism is a fourth three-way valve 118.

[0120] The secondary refrigeration evaporator 119 is connected in series to the refrigeration evaporator, the inlet of the secondary refrigeration evaporator is connected to the outlet of the refrigeration evaporator, and the outlet of the secondary refrigeration evaporator is connected to the outlet flow path of the secondary refrigeration evaporator.

[0121] A secondary refrigeration branch is connected in parallel to the secondary refrigeration evaporator, including a secondary refrigeration branch inlet and a secondary refrigeration branch outlet, and the secondary refrigeration branch outlet is connected to the secondary refrigeration evaporator outlet flow path;

[0122] The secondary refrigeration flow path switching mechanism is connected to the refrigeration evaporator outlet flow path, connected to the secondary refrigeration branch inlet, and connected to the secondary refrigeration evaporator inlet, and is used for controlled switching of the refrigerant flow to the secondary refrigeration branch or the secondary refrigeration evaporator. The secondary refrigeration flow path switching mechanism is a fifth three-way valve 117.

[0123] A refrigeration branch is connected in parallel to the refrigeration evaporator, comprising a refrigeration branch inlet and a refrigeration branch outlet, wherein the refrigeration branch outlet is connected to the refrigeration evaporator outlet;

[0124] The refrigeration flow path switching mechanism is connected to the first flow path switching mechanism, connected to the refrigeration evaporator inlet, and connected to the refrigeration branch inlet, and is used to controllably switch the refrigerant flow to the refrigeration branch or the refrigeration evaporator. The refrigeration flow path switching mechanism is a sixth three-way valve 116.

[0125] The controller is used to control the compressor, flow path switching mechanism and fan.

[0126] Specifically, the controller is used to control the first, second, fifth and sixth three-way valves to switch to a state where the refrigerant flows through the refrigerated evaporator 108 when the actual temperature of the storage chamber corresponding to the refrigerated evaporator 108 is higher than the set maximum temperature of the storage chamber.

[0127] The controller is used to control the first, second, third and fourth three-way valves to switch to a state where the refrigerant flows through the freezing evaporator 113 when the actual temperature of the storage chamber corresponding to the freezing evaporator 113 is higher than the set maximum temperature of the storage chamber.

[0128] The controller is used to control the first, second, third and fourth three-way valves to switch the refrigerant to a state where the refrigerant flows through the variable temperature evaporator 115 when the actual temperature of the storage chamber corresponding to the variable temperature evaporator 115 is higher than the set maximum temperature of the storage chamber.

[0129] The controller is used to control the first, second, fifth and sixth three-way valves to switch the refrigerant to the state where the secondary refrigeration evaporator 119 flows when the actual temperature of the storage room corresponding to the secondary refrigeration evaporator 119 is higher than the set maximum temperature of the storage room.

[0130] The first flow path switching mechanism is used to control the flow direction of the refrigerant to flow to the refrigeration evaporator preferentially when the refrigeration chamber, the freezing chamber and the temperature-changing chamber all need refrigeration.

[0131] 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.

[0132] 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 to be cooled, and to controllably switch the refrigerant flow to the variable temperature branch when the variable temperature chamber does not need to be cooled.

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

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

[0135] The secondary refrigeration flow path switching mechanism is used to control the switching of the flow direction of the refrigerant to preferentially flow to the refrigeration evaporator when both the refrigeration chamber and the secondary refrigeration chamber need refrigeration.

[0136] The controller is used to control the fan corresponding to the evaporator to start when the actual temperature of the storage chamber corresponding to the evaporator is higher than the maximum set temperature; the controller is used to control the fan corresponding to the evaporator to stop when the actual temperature of the storage chamber corresponding to the evaporator is lower than the minimum set temperature.

[0137] Specifically, the working process of the refrigeration equipment is as follows:

[0138] Check the temperature of all storage rooms;

[0139] If the detected temperature of the storage chamber corresponding to the evaporator is higher than the set maximum temperature of the storage chamber, the controller controls the flow path switching mechanism to switch to a state in which the refrigerant flows through the evaporator.

[0140] The controller is used to control the fan corresponding to the evaporator to start when the actual temperature of the storage chamber corresponding to the evaporator is higher than the maximum set temperature; the controller is used to control the fan corresponding to the evaporator to stop when the actual temperature of the storage chamber corresponding to the evaporator is lower than the minimum set temperature.

[0141] When the refrigeration room and / or the secondary refrigeration room need cooling, and the freezing room and the temperature-changing room do not need cooling, the refrigeration room temperature t is monitored. RⅠ Higher than the maximum temperature set in the refrigerator RⅠmax and / or refrigerator temperature t RⅡ Higher than the maximum temperature set in the refrigerator RⅡmax , freezer temperature t F , variable temperature room t V Lower than the maximum temperature set for the two compartments t Fmax ,t VmaxWhen the first three-way solenoid valve 106 is in state 1 (connected to the first throttling device 107), the second three-way solenoid valve 105 is in state 1 (connected to the first three-way valve 106). If the cold storage room needs to be cooled, the sixth three-way solenoid valve 116 is in state 1 (connected to the cold storage evaporator 108), otherwise it is in state 2 (connected to the variable temperature branch); if the secondary cold storage room needs to be cooled, the fifth three-way solenoid valve 117 is in state 1 (connected to the secondary cold storage evaporator 119), otherwise it is in state 2 (connected to the secondary cold storage branch). The refrigeration fan and / or the secondary cold storage fan are started, and the freezing and variable temperature fans are stopped. The gas rich in low boiling point refrigerant separated from the gas-liquid separator 103 is condensed by the second condenser 104 and remixed with the separated liquid rich in high boiling point refrigerant. After being throttled by the first throttling device 107, it enters the cold storage evaporator 108 and / or the secondary cold storage room evaporator 119 to absorb heat.

[0142] When the freezer compartment and / or the variable temperature room need cooling, and the refrigerator compartment and the secondary refrigerator compartment do not need cooling, the freezer compartment temperature t F Higher than the maximum temperature set in the freezer Fmax and / or variable room temperature t V Higher than the maximum temperature set in the variable temperature room t Vmax , Refrigerator temperature t RⅠ , Secondary refrigeration room temperature t RⅡ Lower than the maximum temperature set for the two compartments t RⅠmax ,t RⅡmax When the first three-way solenoid valve 106 is in state 2 (connected to the second throttling pipeline 111), the second three-way solenoid valve 105 is in state 2 (connected to the second throttling pipeline 111). If the freezing chamber needs to be cooled, the fourth three-way solenoid valve 118 is in state 1 (connected to the freezing evaporator 113), otherwise it is in state 2 (connected to the freezing branch); if the variable temperature chamber needs to be cooled, the third three-way solenoid valve 114 is in state 1 (connected to the variable temperature evaporator 115), otherwise it is in state 2 (connected to the refrigeration branch). The freezing and / or variable temperature fans are started, the refrigeration fans and the secondary refrigeration fans are stopped, and the gas rich in low boiling point refrigerant separated from the gas-liquid separator 103 is condensed by the second condenser 104 and remixed with the separated liquid rich in high boiling point refrigerant. After throttling through the second throttling pipeline 111, it enters the freezing evaporator 113 and / or the variable temperature evaporator 115 to absorb heat.

[0143] When the refrigeration room and / or the secondary refrigeration room need cooling, and the freezer room and / or the temperature-changing room need cooling, the refrigeration room temperature t RⅠ Higher than the maximum temperature set in the refrigerator RⅠmax and / or refrigerator temperature t RⅡ Higher than the maximum temperature set in the refrigerator RⅡmax , and the freezing chamber temperature tF Higher than the maximum temperature set in the freezer Fmax and / or variable room temperature t V Higher than the maximum temperature set in the variable temperature room t Vmax , the first three-way solenoid valve 106 is in state 1 (connected to the first throttling device 107), and the second three-way solenoid valve 105 is in state 2 (connected to the second throttling pipeline 111). If the refrigerating chamber needs cooling, the sixth three-way solenoid valve 116 is in state 1 (connected to the refrigerating evaporator 108), otherwise it is in state 2 (connected to the variable temperature branch); if the secondary refrigerating chamber needs cooling, the fifth three-way solenoid valve 117 is in state 1 (connected to the secondary refrigerating evaporator 119), otherwise it is in state 2 (connected to the secondary refrigerating branch). If the freezing chamber needs cooling, the fourth three-way solenoid valve 118 is in state 1 (connected to the freezing evaporator 113), otherwise it is in state 2 (connected to the freezing branch); if the variable temperature chamber needs cooling, the third three-way solenoid valve 114 is in state 1 (connected to the variable temperature evaporator 115), otherwise it is in state 2 (connected to the refrigerating branch). The refrigeration fan and / or the secondary refrigeration machine are started, and the freezing and / or temperature-variable fan is started. At this time, the gas rich in low-boiling-point refrigerant separated from the gas-liquid separator 103 is condensed by the second condenser 104 and throttled by the second throttling pipeline 111, and then enters the freezing evaporator 113 and / or the temperature-variable evaporator 115 to absorb heat. The liquid rich in high-boiling-point refrigerant separated from the gas-liquid separator 103 is throttled by the first throttling device 107, and then enters the refrigeration evaporator 108 and / or the secondary refrigeration evaporator 119 to absorb heat. For example, when the refrigeration room, the secondary refrigeration room, the freezing room and the temperature-variable room all need cooling, that is, the refrigeration room temperature t is monitored. RⅠ , Secondary refrigeration room temperature t RⅡ , Freezer temperature t F , variable temperature room t V All higher than the maximum temperature set in each compartment RⅠmax ,t RⅡmax ,t Fmax ,t VmaxWhen the third three-way solenoid valve 114 is in state 1 (connected to the variable temperature evaporator 115), the fourth three-way solenoid valve 118 is in state 1 (connected to the freezing evaporator 113), the fifth three-way solenoid valve 117 is in state 1 (connected to the secondary refrigeration evaporator 119), and the sixth three-way solenoid valve 116 is in state 1 (connected to the refrigeration evaporator 108), the refrigeration fan, the secondary refrigeration fan freezing, and the variable temperature fan are all started. At this time, the gas rich in low-boiling-point refrigerant separated from the gas-liquid separator 103 is condensed by the second condenser 104 and throttled by the second throttling pipeline 111, and then enters the refrigeration evaporator 113 and the temperature-variable evaporator 115 to absorb heat; the liquid rich in high-boiling-point refrigerant separated from the gas-liquid separator 103 is throttled by the first throttling device 107, and then enters the refrigeration I evaporator 108 and the secondary refrigeration evaporator 119 to absorb heat, and then is throttled by the second throttling device 109, mixed with the refrigerant flowing out of the second check valve 112, and returns to the compressor through the first pipeline 1111 for heat exchange.

[0144] During the cooling process of the freezing room and the variable temperature room, the temperature of the cold storage room is constantly monitored. RI , Secondary refrigeration room temperature t RⅡ Once the refrigerator temperature t RI Higher than the set maximum temperature t RImax Or the secondary cold storage room temperature t RⅡ Higher than the set maximum temperature t RIImax The first three-way valve 106 is switched to state 1 in communication with the refrigeration evaporator.

[0145] When the temperatures of the four compartments are within the set temperature range, the compressor stops and the fan stops.

[0146] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0147] 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 a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A refrigeration device, comprising: A low-temperature storage room and a refrigeration system for supplying cold to the low-temperature storage room; characterized in that: The refrigeration system comprises: A compressor connected to a compressor inlet flow path and a compressor outlet flow path; a first condenser connected to the compressor outlet flow path and connected to a first condenser outlet flow path; A gas-liquid separator connected to the first condenser outlet flow path, and connected to a gas-liquid separator gaseous outlet flow path and a gas-liquid separator liquid outlet flow path; a second condenser connected to the gaseous outlet flow path of the gas-liquid separator and connected to a second condenser outlet flow path; A regenerator, comprising a first pipeline and a second throttling pipeline for heat exchange with each other, wherein the first pipeline outlet is connected to the compressor inlet flow path, and the second throttling pipeline comprises a second throttling pipeline inlet flow path and a second throttling pipeline outlet flow path; A refrigerated evaporator, wherein the inlet and the outlet of the refrigerated evaporator are respectively connected to the refrigerated evaporator inlet flow path and the refrigerated evaporator outlet flow path, wherein a first throttling device is provided on the refrigerated evaporator inlet flow path, and the refrigerated evaporator outlet flow path is connected to the first pipeline inlet; A refrigeration evaporator and a temperature-variable evaporator connected in series; A refrigeration evaporator connected to the outlet flow path of the second throttling pipeline; A variable temperature evaporator is connected to a variable temperature evaporator outlet flow path, wherein the variable temperature evaporator outlet flow path is connected to the first pipeline inlet of the regenerator; It also includes a freezing branch and / or a temperature-changing branch; wherein the freezing branch is connected in parallel to the freezing evaporator, and the temperature-changing branch is connected in parallel to the temperature-changing evaporator; A freezing flow path switching mechanism, used for controlled switching of the refrigerant flow to the freezing branch or the freezing evaporator; A temperature-variable flow path switching mechanism, used for controlled switching of the refrigerant flow to the temperature-variable branch or the temperature-variable evaporator; a first flow path switching mechanism, the first flow path switching mechanism connecting the liquid outlet flow path of the gas-liquid separator, the refrigeration evaporator inlet flow path and the second throttling pipeline inlet flow path; A second flow path switching mechanism, the second flow path switching mechanism connecting the second condenser outlet flow path, the gas-liquid separator liquid outlet flow path and the regenerator second throttling pipe inlet flow path, the second flow path switching mechanism being used for controlled switching of the refrigerant flow direction; A check valve is provided on the evaporator outlet flow path to prevent the refrigerant from flowing back to the evaporator; The refrigeration equipment adopts a mixed refrigerant, and the mixed refrigerant includes two refrigerants with different boiling points.

2. The refrigeration equipment according to claim 1, characterized in that: The refrigeration evaporator is used to provide cold energy to the refrigeration chamber, the freezing evaporator is used to provide cold energy to the freezing chamber, and the variable temperature evaporator is used to provide cold energy to the variable temperature chamber; The first flow path switching mechanism is used to control the flow direction of the refrigerant to preferentially flow to the refrigeration evaporator when the refrigeration chamber, the freezing chamber and the temperature-changing chamber all need refrigeration.

3. The refrigeration equipment according to claim 1, characterized in that: The freezing flow path switching mechanism is used to controllably switch the refrigerant flow to the freezing evaporator when the freezing chamber needs to be refrigerated, and controllably switch the refrigerant flow to the freezing branch when the freezing chamber does not need to be refrigerated; The temperature-variable flow path switching mechanism is used to controllably switch the refrigerant flow to the temperature-variable evaporator when the temperature-variable room needs to be cooled, and to controllably switch the refrigerant flow to the temperature-variable branch when the temperature-variable room does not need to be cooled.

4. The refrigeration equipment according to claim 1, 2 or 3, characterized in that: The refrigeration system further comprises: A secondary refrigeration evaporator is used to provide cooling for the secondary refrigeration chamber. The secondary refrigeration evaporator is connected in series to the refrigeration evaporator, and the inlet of the secondary refrigeration evaporator is connected to the outlet of the refrigeration evaporator.

5. The refrigeration equipment according to claim 4, characterized in that: The refrigeration system further comprises: A refrigeration branch and / or a secondary refrigeration branch, wherein the refrigeration branch is connected in parallel to the refrigeration evaporator, and the secondary refrigeration branch is connected in parallel to the secondary refrigeration evaporator; A refrigeration flow path switching mechanism, used for controlled switching of the refrigerant flow to the refrigeration branch or the refrigeration evaporator; The secondary refrigeration flow path switching mechanism is used for controlled switching of the refrigerant flow to the secondary refrigeration branch or the secondary refrigeration evaporator.

6. The refrigeration device according to claim 5, characterized in that: The refrigeration flow path switching mechanism is used to controllably switch the refrigerant flow to the refrigeration evaporator when the refrigeration chamber needs refrigeration, and controllably switch the refrigerant flow to the refrigeration branch when the refrigeration chamber does not need refrigeration; The secondary refrigeration flow path switching mechanism is used for controlled switching of the refrigerant flow to the secondary refrigeration evaporator when the secondary refrigeration chamber needs refrigeration; Used to controllably switch the refrigerant flow to the secondary refrigeration branch when the secondary refrigeration chamber does not need refrigeration.

7. The refrigeration device according to claim 5, characterized in that: The secondary refrigeration flow path switching mechanism is used to control the refrigerant to switch the flow direction of the refrigerant to flow to the refrigeration evaporator preferentially when both the refrigeration chamber and the secondary refrigeration chamber need to be refrigerated.

8. The refrigeration equipment according to any one of claims 1-3 and 5-7, characterized in that: The refrigeration device comprises a fan corresponding to the evaporator, and the fan is controlled to start when the refrigerant flows through the evaporator.

9. The refrigeration equipment according to claim 4, characterized in that: The refrigeration device comprises a fan corresponding to the evaporator, and the fan is controlled to start when the refrigerant flows through the evaporator.

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