Refrigeration device, control method for a refrigeration device

Abstract

This invention provides a refrigeration device and a control method for the refrigeration device. The refrigeration device includes a housing, a controller, and a high-temperature stage and a low-temperature stage refrigeration cycle loop. The controller is used to time the duration for which the switching valve is simultaneously connected to the first and second cooling branches if a switching valve is simultaneously connected to both the first and second cooling branches, and both the high-temperature stage and the low-temperature stage compressors are running. Within t1, if the following condition is met: the temperature T2 monitored by the second temperature sensor drops to the preset shutdown temperature T of the second storage compartment... 2关 And at that moment, the preset shutdown temperature T of the first storage room 1关 <Temperature T1 monitored by the first temperature sensor <Preset start-up temperature T of the first storage compartment 1开 And before that moment, T1 was always greater than T. 1关 Then, the low-temperature stage compressor is stopped, and the switching valve is switched to connect only to the first cooling branch. This invention can solve the problem that existing refrigeration devices cannot store food in separate temperature zones.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and in particular to a refrigeration device and a control method for the refrigeration device. Background Technology

[0002] With the improvement of people's living standards and the convenience of transportation, the concept of healthy living has taken root in people's hearts. Food ingredients from different regions and even different countries are gradually entering shopping malls and supermarkets, and more and more kinds of ingredients and foods are entering family tables. However, the storage conditions and preservation requirements of different ingredients are not the same, and even the freshness of ingredients will change with the storage conditions. Therefore, it is necessary to classify and store ingredients in different temperature zones to achieve the best storage and preservation effect. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention aims to provide a refrigeration device and a control method for the refrigeration device, thereby solving the problem that existing refrigeration devices cannot store food in separate temperature zones.

[0004] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides a refrigeration device, comprising:

[0005] A high-temperature refrigeration cycle circuit includes a high-temperature compressor, a switching valve, and parallel branches. A first refrigerant flows through the high-temperature refrigeration cycle circuit. The parallel branches include a first cooling branch and a second cooling branch connected in parallel. The first cooling branch includes a high-temperature evaporator, and the second cooling branch includes an evaporation section. The switching valve can be selectively connected to at least one of the first cooling branch and the second cooling branch.

[0006] A low-temperature stage refrigeration cycle circuit includes a low-temperature stage compressor and a condenser section. A second refrigerant flows through the low-temperature stage refrigeration cycle circuit, and the second refrigerant flowing through the condenser section exchanges heat with the first refrigerant flowing through the evaporator section.

[0007] The enclosure has a first storage compartment and a second storage compartment. The high-temperature refrigeration cycle circuit supplies cooling to the first storage compartment, and the low-temperature refrigeration cycle circuit supplies cooling to the second storage compartment. A first temperature sensor is installed in the first storage compartment, and a second temperature sensor is installed in the second storage compartment.

[0008] Controller, used for

[0009] If the switching valve is simultaneously connected to the first cooling branch and the second cooling branch, and both the high-temperature compressor and the low-temperature compressor are in operation, then the duration of the switching valve being simultaneously connected to the first cooling branch and the second cooling branch is timed.

[0010] If, within a preset time t1, the temperature T2 detected by the second temperature sensor drops to the preset shutdown temperature T of the second storage compartment... 2关 Then, it is determined whether the temperature T1 monitored by the first temperature sensor meets the first preset condition; wherein, the first preset condition is: at this moment, T1 ≥ the preset start-up temperature T of the first storage room. 1开 Or, the preset shutdown temperature T of the first storage compartment at that moment. 1关 <T1<T 1开 And before that moment, T1 was always greater than T. 1关 ;

[0011] If so, the cryogenic compressor is stopped, and the switching valve is switched to connect only to the first cooling branch.

[0012] As a further improvement to one embodiment of the present invention, the controller is also used for,

[0013] If T1 does not meet the first preset condition, then both the low-temperature compressor and the high-temperature compressor will be shut down.

[0014] As a further improvement to one embodiment of the present invention, the controller is also used for,

[0015] Within a preset time t1, if T1 and T2 satisfy: T1≤T 1关 And T2>T 2关 If the high-temperature stage compressor is stopped, the switching valve will be switched to connect only to the second cooling branch.

[0016] As a further improvement to one embodiment of the present invention, after a preset time t1, if T1>T 1关 And T2>T 2关 Then, the switching valve is controlled to switch to only connect with the second cooling branch.

[0017] As a further improvement to one embodiment of the present invention, the controller is also used for,

[0018] When the temperature signal from the first temperature sensor cannot be obtained, the switching valve is controlled to switch to connect with the first cooling branch, and the high-temperature stage compressor is controlled to start.

[0019] After a preset time t2, the high-temperature stage compressor is controlled to stop.

[0020] The preset temperature T of the first storage room 1y When the temperature is between 6 and 10℃, control t2 = 3 min;

[0021] T 1yWhen the temperature is between 1 and 5℃, control t2 = 4 min;

[0022] T 1y When the temperature is between -4°C and 0°C, control t2 = 5 min;

[0023] T 1y When the temperature is between -9 and -5℃, control t2 = 6 min;

[0024] T 1y When the temperature is between -13 and -10℃, control t2 = 7 min;

[0025] T 1y When the temperature is between -17 and -14℃, control t2 = 8 min;

[0026] T 1y When the temperature is between -21°C and -18°C, control t2 = 9 min;

[0027] T 1y When the temperature is between -24°C and -22°C, control t2 = 10 min.

[0028] T 1y When the temperature is between -27°C and -25°C, control t2 to be 11 minutes.

[0029] T 1y When the temperature is between -30°C and -28°C, control t2 = 12 min.

[0030] As a further improvement to one embodiment of the present invention, the controller is also used for,

[0031] When the temperature signal from the second temperature sensor cannot be obtained, the switching valve is controlled to switch to connect with the second cooling branch, and the low-temperature stage compressor is controlled to start.

[0032] After a preset time t3, the cryogenic stage compressor is controlled to stop.

[0033] The preset temperature T of the second storage room 2y When the temperature is between -24°C and -20°C, control t3 to be 4 minutes.

[0034] T 2y When the temperature is between -29°C and -25°C, control t3 to be 5 minutes.

[0035] T 2y When the temperature is between -34°C and -30°C, control t3 to be 6 minutes.

[0036] T 2y When the temperature is between -39°C and -35°C, control t3 to be 7 minutes.

[0037] T 2yWhen the temperature is between -43°C and -40°C, control t3 to be 8 minutes.

[0038] T 2y When the temperature is between -47 and -44℃, control t3 to be 9 minutes.

[0039] T 2y When the temperature is between -51 and -48℃, control t3 to be 10 min.

[0040] T 2y When the temperature is between -54°C and -52°C, control t3 to be 11 minutes.

[0041] T 2y When the temperature is between -57 and -55℃, control t3 to be 12 minutes.

[0042] T 2y When the temperature is between -60 and -58℃, control t3 = 13 min.

[0043] To achieve one of the above-mentioned objectives, one embodiment of the present invention also provides a control method for a refrigeration device, the control method comprising:

[0044] If the switching valve is simultaneously connected to the first cooling branch and the second cooling branch, and both the high-temperature compressor and the low-temperature compressor are in operation, then the duration of the switching valve being simultaneously connected to the first cooling branch and the second cooling branch is timed.

[0045] If T2 drops to T within the preset time t1, 2关 Then determine whether T1 satisfies the first preset condition; wherein, the first preset condition is: at this time T1≥T 1开 Or, at that moment T 1关 <T1<T 1开 And before that moment, T1 was always greater than T. 1关 ;

[0046] If so, the cryogenic compressor is stopped, and the switching valve is switched to connect only to the first cooling branch.

[0047] As a further improvement of one embodiment of the present invention, the control method further includes, if T1 does not meet the first preset condition, controlling both the low-temperature stage compressor and the high-temperature stage compressor to stop.

[0048] As a further improvement of one embodiment of the present invention, the control method further includes, within a preset time t1, if T1 and T2 satisfy: T1≤T 1关 And T2>T 2关 If the high-temperature stage compressor is stopped, the switching valve will be switched to connect only to the second cooling branch.

[0049] As a further improvement to one embodiment of the present invention, the control method further includes, after a preset time t1, if T1>T 1关 And T2>T 2关 Then, the switching valve is controlled to switch to only connect with the second cooling branch.

[0050] As a further improvement to one embodiment of the present invention, the control method further includes,

[0051] When the temperature signal from the first temperature sensor cannot be obtained, the switching valve is controlled to switch to connect with the first cooling branch, and the high-temperature stage compressor is controlled to start.

[0052] After a preset time t2, the high-temperature stage compressor is controlled to stop.

[0053] The preset temperature T of the first storage room 1y When the temperature is between 6 and 10℃, control t2 = 3 min;

[0054] T 1y When the temperature is between 1 and 5℃, control t2 = 4 min;

[0055] T 1y When the temperature is between -4°C and 0°C, control t2 = 5 min;

[0056] T 1y When the temperature is between -9 and -5℃, control t2 = 6 min;

[0057] T 1y When the temperature is between -13 and -10℃, control t2 = 7 min;

[0058] T 1y When the temperature is between -17 and -14℃, control t2 = 8 min;

[0059] T 1y When the temperature is between -21°C and -18°C, control t2 = 9 min;

[0060] T 1y When the temperature is between -24°C and -22°C, control t2 = 10 min.

[0061] T 1y When the temperature is between -27°C and -25°C, control t2 to be 11 minutes.

[0062] T 1y When the temperature is between -30°C and -28°C, control t2 = 12 min.

[0063] As a further improvement to one embodiment of the present invention, the control method further includes,

[0064] When the temperature signal from the second temperature sensor cannot be obtained, the switching valve is controlled to switch to connect with the second cooling branch, and the low-temperature stage compressor is controlled to start.

[0065] After a preset time t3, the cryogenic stage compressor is controlled to stop.

[0066] The preset temperature T of the second storage room 2y When the temperature is between -24°C and -20°C, control t3 to be 4 minutes.

[0067] T 2y When the temperature is between -29°C and -25°C, control t3 to be 5 minutes.

[0068] T 2y When the temperature is between -34°C and -30°C, control t3 to be 6 minutes.

[0069] T 2y When the temperature is between -39°C and -35°C, control t3 to be 7 minutes.

[0070] T 2y When the temperature is between -43°C and -40°C, control t3 to be 8 minutes.

[0071] T 2y When the temperature is between -47 and -44℃, control t3 to be 9 minutes.

[0072] T 2y When the temperature is between -51 and -48℃, control t3 to be 10 min.

[0073] T 2y When the temperature is between -54°C and -52°C, control t3 to be 11 minutes.

[0074] T 2y When the temperature is between -57 and -55℃, control t3 to be 12 minutes.

[0075] T 2y When the temperature is between -60 and -58℃, control t3 = 13 min.

[0076] Compared with the prior art, the present invention has the following beneficial effects: In the refrigeration device and control method of the present invention, when the first refrigerant flows in the first cooling branch, the high-temperature evaporator cools the first storage chamber; when the first refrigerant flows in the second cooling branch, the first refrigerant flowing through the evaporation section exchanges heat with the second refrigerant flowing through the condensation section. The first refrigerant in the evaporation section can absorb the heat of the second refrigerant flowing through the condensation section, thereby further reducing the temperature of the second refrigerant in the condensation section, pre-cooling the low-temperature refrigeration cycle loop, thus enabling the low-temperature refrigeration cycle loop to achieve a lower temperature; furthermore, the flow direction of the first refrigerant and the start / stop status of the high-temperature compressor and the low-temperature compressor can be controlled according to the temperature in the first storage chamber and the temperature in the second storage chamber, thereby achieving cooling control of the first and second storage chambers as needed, avoiding energy waste while meeting refrigeration requirements. Attached Figure Description

[0077] Figure 1 This is a schematic diagram of the cascade compression refrigeration system according to Embodiment 1 of the present invention;

[0078] Figure 2 This is a schematic diagram of the cascade compression refrigeration system of Embodiment 2 of the present invention. Detailed Implementation

[0079] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings.

[0080] In the various illustrations of this invention, for ease of illustration, certain dimensions of structures or parts may be enlarged relative to other structures or parts; therefore, only the basic structure of the subject matter of this invention is used to illustrate the invention.

[0081] It should be understood that although the terms first, second, etc., may be used in this document to describe various elements or structures, the objects being described should not be limited by these terms. These terms are only used to distinguish these objects from one another.

[0082] A refrigeration device provided in one embodiment of the present invention includes a cabinet and a door. The cabinet has a storage compartment, and the door is used to open or close the storage compartment. The refrigeration device also includes a refrigeration system disposed in the cabinet and supplying cooling to the storage compartment. Specifically, the refrigeration device can be configured as a freezer, refrigerator, etc., to meet the needs of different users and different application scenarios.

[0083] Example 1

[0084] In this embodiment, the enclosure has a first storage compartment and a second storage compartment. The first storage compartment can be a refrigerator compartment or a freezer compartment, and the second storage compartment can be a variable temperature compartment or a cryogenic compartment. The refrigeration system adopts a cascade compression refrigeration system 100, which includes a high-temperature stage refrigeration cycle loop 1 and a low-temperature stage refrigeration cycle loop 2.

[0085] For ease of description, this embodiment uses the example of a high-temperature refrigeration cycle loop 1 cooling the first storage compartment and a low-temperature refrigeration cycle loop 2 cooling the second storage compartment. Of course, the two can be interchanged.

[0086] Of course, in other embodiments, other storage rooms besides the first and second storage rooms can be provided according to actual needs.

[0087] See Figure 1 The high-temperature refrigeration cycle loop 1 includes a high-temperature compressor 11, a switching valve 17, and parallel branches connected in series. A first refrigerant flows through the high-temperature refrigeration cycle loop 1. The parallel branches include a first cooling branch and a second cooling branch connected in parallel. The first cooling branch includes a first throttling device 161 and a high-temperature evaporator 15 connected in series. The second cooling branch includes a second throttling device 162 and an evaporator 12 connected in series. The switching valve 17 is located at the inlet of the parallel branches and can be selectively connected to at least one of the first and second cooling branches, thereby selectively controlling the flow direction of the first refrigerant as needed to achieve different functions and cooling effects. Thus, the first storage compartment can achieve a temperature range of -30 to 10°C, and the temperature can be adjusted within this range.

[0088] The low-temperature refrigeration cycle loop 2 includes a low-temperature compressor 22, a low-temperature evaporator 24 and a condenser 21. A second refrigerant flows through the low-temperature refrigeration cycle loop 2, and the second refrigerant flowing through the condenser 21 exchanges heat with the first refrigerant flowing through the evaporator 12.

[0089] In this way, when the first refrigerant flows in the first cooling branch, the high-temperature evaporator 15 cools the first storage room; when the first refrigerant flows in the second cooling branch, the first refrigerant flowing through the evaporator 12 exchanges heat with the second refrigerant flowing through the condenser 21. The first refrigerant in the evaporator 12 can absorb the heat of the second refrigerant flowing through the condenser 21, thereby further reducing the temperature of the second refrigerant in the condenser 21, pre-cooling the low-temperature refrigeration cycle loop 2, so that the low-temperature refrigeration cycle loop 2 can achieve a lower temperature.

[0090] The first refrigerant and the second refrigerant can be the same refrigerant or different refrigerants.

[0091] In addition, "high temperature" and "low temperature" in "high temperature refrigeration cycle loop 1" and "low temperature refrigeration cycle loop 2" are relative terms. Relatively speaking, the evaporation temperature of the first refrigerant flowing through the high temperature refrigeration cycle loop 1 is higher than the evaporation temperature of the second refrigerant flowing through the low temperature refrigeration cycle loop 2.

[0092] The first storage room is equipped with a first temperature sensor, and the second storage room is equipped with a second temperature sensor. That is, the first temperature sensor detects the temperature T1 in the first storage room, and the second temperature sensor detects the temperature T2 in the second storage room; that is, the temperature detected by the first temperature sensor is the temperature T1 in the first storage room, and the temperature detected by the second temperature sensor is the temperature T2 in the second storage room.

[0093] The refrigeration unit also includes a controller, to which the first temperature sensor, the second temperature sensor, the switching valve 17, the high-temperature stage compressor 11, and the low-temperature stage compressor 12 are all connected. The controller acquires the temperatures detected by the first and second temperature sensors and controls the connection status of the switching valve 17 with the first and second cooling branches, as well as the operating status of the high-temperature stage compressor 11 and the low-temperature stage compressor 22, based on the temperatures detected by the first and second temperature sensors.

[0094] The controller is used for,

[0095] If the switching valve 17 is simultaneously connected to the first cooling branch and the second cooling branch, and both the high-temperature compressor 11 and the low-temperature compressor 22 are in operation, then the duration of the switching valve 17 being simultaneously connected to the first cooling branch and the second cooling branch is timed.

[0096] If, within a preset time t1, the temperature T2 detected by the second temperature sensor drops to the preset shutdown temperature T of the second storage compartment... 2关 Then, it is determined whether the temperature T1 monitored by the first temperature sensor meets the first preset condition; wherein, the first preset condition is: at this moment, T1 ≥ the preset start-up temperature T of the first storage room. 1开 Or, the preset shutdown temperature T of the first storage compartment at that moment. 1关 <T1<T 1开 And before that moment, T1 was always greater than T. 1关 ;

[0097] If so, the cryogenic compressor 22 is stopped, and the switching valve 17 is switched to connect only to the first cooling branch.

[0098] In this way, the flow of the first refrigerant and the start / stop status of the high-temperature compressor 11 and the low-temperature compressor 22 can be controlled according to the temperature in the first storage room and the temperature in the second storage room, thereby realizing the cooling control of the first storage room and the second storage room as needed, and avoiding energy waste while meeting the cooling demand.

[0099] Preferably, t1 = 5 to 40 minutes, which not only provides sufficient cooling to the first and second storage rooms to effectively reduce their temperature, but also avoids energy waste.

[0100] Furthermore, the controller is also used to,

[0101] If T1 does not meet the first preset condition, then both the low-temperature compressor 22 and the high-temperature compressor 11 will be shut down.

[0102] In this way, cooling control of the first and second storage rooms can be achieved as needed, avoiding energy waste while meeting cooling requirements.

[0103] Furthermore, the controller is also used to,

[0104] Within a preset time t1, if T1 and T2 satisfy: T1≤T 1关 And T2>T 2关 If the high-temperature compressor 11 is stopped, the switching valve 17 will be switched to connect only to the second cooling branch.

[0105] In other words, if the temperature inside the first storage room drops to its preset shutdown temperature within a preset time t1, while the temperature inside the second storage room has not yet dropped to its preset shutdown temperature, the high-temperature cooling cycle loop 1 can be stopped, thereby accelerating the cooling efficiency of the second storage room and avoiding energy waste.

[0106] Furthermore, the controller is also used to,

[0107] After a preset time t1, if T1>T 1关 And T2>T 2关 Then, control switching valve 17 is switched to connect only to the second cooling branch.

[0108] In other words, after a preset time t1, if the relative temperatures in the first storage room and the second storage room have not dropped to their respective preset shutdown temperatures, the low-temperature refrigeration cycle loop 2 will be prioritized to supply cooling to the second storage room.

[0109] Furthermore, the controller is also used to,

[0110] When the temperature signal from the first temperature sensor cannot be obtained, the switching valve 17 is switched to connect with the first cooling branch, and the high-temperature compressor 11 is started.

[0111] After a preset time t2, the high-temperature stage compressor 11 is shut down.

[0112] The preset temperature T of the first storage room 1y When the temperature is between 6 and 10℃, control t2 = 3 min;

[0113] T 1y When the temperature is between 1 and 5℃, control t2 = 4 min;

[0114] T 1y When the temperature is between -4°C and 0°C, control t2 = 5 min;

[0115] T 1y When the temperature is between -9 and -5℃, control t2 = 6 min;

[0116] T 1y When the temperature is between -13 and -10℃, control t2 = 7 min;

[0117] T 1y When the temperature is between -17 and -14℃, control t2 = 8 min;

[0118] T 1y When the temperature is between -21°C and -18°C, control t2 = 9 min;

[0119] T 1y When the temperature is between -24°C and -22°C, control t2 = 10 min.

[0120] T 1y When the temperature is between -27°C and -25°C, control t2 to be 11 minutes.

[0121] T 1y When the temperature is between -30°C and -28°C, control t2 = 12 min.

[0122] Thus, when the temperature signal from the first temperature sensor cannot be obtained, it indicates that the first temperature sensor has malfunctioned. In this case, real-time monitoring of the temperature inside the first storage room is impossible. The cooling duration of the high-temperature stage refrigeration cycle 1 can be controlled according to the preset temperature range of the first storage room. This ensures the normal operation of the refrigeration device in the event of temperature sensor failure or damage, thereby preventing the food and other items stored in the first storage room from spoiling or rotting. Furthermore, the duration of t2 is related to the preset temperature T of the first storage room. 1y Negative correlation, that is, T 1yThe lower the value, the larger the value of t2. This not only ensures that the first storage room receives sufficient cooling, but also allows for control of the energy efficiency of the refrigeration system, thereby saving energy.

[0123] Furthermore, the controller is also used to,

[0124] When the temperature signal from the second temperature sensor cannot be obtained, the control switching valve 17 is switched to connect with the second cooling branch, and the low-temperature stage compressor 22 is started.

[0125] After a preset time t3, the cryogenic stage compressor 22 is shut down.

[0126] The preset temperature T of the second storage room 2y When the temperature is between -24°C and -20°C, control t3 to be 4 minutes.

[0127] T 2y When the temperature is between -29°C and -25°C, control t3 to be 5 minutes.

[0128] T 2y When the temperature is between -34°C and -30°C, control t3 to be 6 minutes.

[0129] T 2y When the temperature is between -39°C and -35°C, control t3 to be 7 minutes.

[0130] T 2y When the temperature is between -43°C and -40°C, control t3 to be 8 minutes.

[0131] T 2y When the temperature is between -47 and -44℃, control t3 to be 9 minutes.

[0132] T 2y When the temperature is between -51 and -48℃, control t3 to be 10 min.

[0133] T 2y When the temperature is between -54°C and -52°C, control t3 to be 11 minutes.

[0134] T 2y When the temperature is between -57 and -55℃, control t3 to be 12 minutes.

[0135] T 2y When the temperature is between -60 and -58℃, control t3 = 13 min.

[0136] Thus, when the temperature signal from the second temperature sensor cannot be obtained, it indicates that the second temperature sensor has malfunctioned. In this case, real-time monitoring of the temperature inside the second storage compartment is impossible. The cooling duration of the low-temperature stage refrigeration cycle 2 can be controlled according to the preset temperature range of the second storage compartment. This ensures the normal operation of the refrigeration device in the event of temperature sensor failure or damage, thereby preventing the food and other items stored in the second storage compartment from spoiling or rotting. Furthermore, the duration of t3 is related to the preset temperature T of the second storage compartment. 2y Negative correlation, that is, T 2y The lower the value, the larger the value of t3. This not only ensures that the second storage room receives sufficient cooling, but also allows for control of the energy efficiency of the refrigeration system, thereby saving energy.

[0137] One embodiment of the present invention also provides a control method for the refrigeration device as described above, comprising,

[0138] If the switching valve 17 is simultaneously connected to the first cooling branch and the second cooling branch, and both the high-temperature compressor 11 and the low-temperature compressor 22 are in operation, then the duration of the switching valve 17 being simultaneously connected to the first cooling branch and the second cooling branch is timed.

[0139] If T2 drops to T within the preset time t1, 2关 Then determine whether T1 satisfies the first preset condition; wherein, the first preset condition is: at this time T1≥T 1开 Or, at that moment T 1关 <T1<T 1开 And before that moment, T1 was always greater than T. 1关 ;

[0140] If so, the cryogenic compressor 22 is stopped, and the switching valve 17 is switched to connect only to the first cooling branch.

[0141] In this way, the flow of the first refrigerant and the start / stop status of the high-temperature compressor 11 and the low-temperature compressor 22 can be controlled according to the temperature in the first storage room and the temperature in the second storage room, thereby realizing the cooling control of the first storage room and the second storage room as needed, and avoiding energy waste while meeting the cooling demand.

[0142] Preferably, t1 = 5 to 40 minutes, which not only provides sufficient cooling to the first and second storage rooms to effectively reduce their temperature, but also avoids energy waste.

[0143] Furthermore, the control method also includes,

[0144] If T1 does not meet the first preset condition, then both the low-temperature compressor 22 and the high-temperature compressor 11 will be shut down.

[0145] In this way, cooling control of the first and second storage rooms can be achieved as needed, avoiding energy waste while meeting cooling requirements.

[0146] Furthermore, the control method also includes,

[0147] Within a preset time t1, if T1 and T2 satisfy: T1≤T 1关 And T2>T 2关 If the high-temperature compressor 11 is stopped, the switching valve 17 will be switched to connect only to the second cooling branch.

[0148] In other words, if the temperature inside the first storage room drops to its preset shutdown temperature within a preset time t1, while the temperature inside the second storage room has not yet dropped to its preset shutdown temperature, the high-temperature cooling cycle loop 1 can be stopped, thereby accelerating the cooling efficiency of the second storage room and avoiding energy waste.

[0149] Furthermore, the control method also includes,

[0150] After a preset time t1, if T1>T 1关 And T2>T 2关 Then, control switching valve 17 is switched to connect only to the second cooling branch.

[0151] In other words, after a preset time t1, if the relative temperatures in the first storage room and the second storage room have not dropped to their respective preset shutdown temperatures, the low-temperature refrigeration cycle loop 2 will be prioritized to supply cooling to the second storage room.

[0152] Furthermore, the control method also includes,

[0153] When the temperature signal from the first temperature sensor cannot be obtained, the switching valve 17 is switched to connect with the first cooling branch, and the high-temperature compressor 11 is started.

[0154] After a preset time t2, the high-temperature stage compressor 11 is shut down.

[0155] The preset temperature T of the first storage room 1y When the temperature is between 6 and 10℃, control t2 = 3 min;

[0156] T 1y When the temperature is between 1 and 5℃, control t2 = 4 min;

[0157] T 1yWhen the temperature is between -4°C and 0°C, control t2 = 5 min;

[0158] T 1y When the temperature is between -9 and -5℃, control t2 = 6 min;

[0159] T 1y When the temperature is between -13 and -10℃, control t2 = 7 min;

[0160] T 1y When the temperature is between -17 and -14℃, control t2 = 8 min;

[0161] T 1y When the temperature is between -21°C and -18°C, control t2 = 9 min;

[0162] T 1y When the temperature is between -24°C and -22°C, control t2 = 10 min.

[0163] T 1y When the temperature is between -27°C and -25°C, control t2 to be 11 minutes.

[0164] T 1y When the temperature is between -30°C and -28°C, control t2 = 12 min.

[0165] Thus, when the temperature signal from the first temperature sensor cannot be obtained, it indicates that the first temperature sensor has malfunctioned. In this case, real-time monitoring of the temperature inside the first storage room is impossible. The cooling duration of the high-temperature stage refrigeration cycle 1 can be controlled according to the preset temperature range of the first storage room. This ensures the normal operation of the refrigeration device in the event of temperature sensor failure or damage, thereby preventing the food and other items stored in the first storage room from spoiling or rotting. Furthermore, the duration of t2 is related to the preset temperature T of the first storage room. 1y Negative correlation, that is, T 1y The lower the value, the larger the value of t2. This not only ensures that the first storage room receives sufficient cooling, but also allows for control of the energy efficiency of the refrigeration system, thereby saving energy.

[0166] Furthermore, the control method also includes,

[0167] When the temperature signal from the second temperature sensor cannot be obtained, the control switching valve 17 is switched to connect with the second cooling branch, and the low-temperature stage compressor 22 is started.

[0168] After a preset time t3, the cryogenic stage compressor 22 is shut down.

[0169] The preset temperature T of the second storage room 2y When the temperature is between -24°C and -20°C, control t3 to be 4 minutes.

[0170] T 2y When the temperature is between -29°C and -25°C, control t3 to be 5 minutes.

[0171] T 2y When the temperature is between -34°C and -30°C, control t3 to be 6 minutes.

[0172] T 2y When the temperature is between -39°C and -35°C, control t3 to be 7 minutes.

[0173] T 2y When the temperature is between -43°C and -40°C, control t3 to be 8 minutes.

[0174] T 2y When the temperature is between -47 and -44℃, control t3 to be 9 minutes.

[0175] T 2y When the temperature is between -51 and -48℃, control t3 to be 10 min.

[0176] T 2y When the temperature is between -54°C and -52°C, control t3 to be 11 minutes.

[0177] T 2y When the temperature is between -57 and -55℃, control t3 to be 12 minutes.

[0178] T 2y When the temperature is between -60 and -58℃, control t3 = 13 min.

[0179] Thus, when the temperature signal from the second temperature sensor cannot be obtained, it indicates that the second temperature sensor has malfunctioned. In this case, real-time monitoring of the temperature inside the second storage compartment is impossible. The cooling duration of the low-temperature stage refrigeration cycle 2 can be controlled according to the preset temperature range of the second storage compartment. This ensures the normal operation of the refrigeration device in the event of temperature sensor failure or damage, thereby preventing the food and other items stored in the second storage compartment from spoiling or rotting. Furthermore, the duration of t3 is related to the preset temperature T of the second storage compartment. 2y Negative correlation, that is, T 2y The lower the value, the larger the value of t3. This not only ensures that the second storage room receives sufficient cooling, but also allows for control of the energy efficiency of the refrigeration system, thereby saving energy.

[0180] See Figure 1 Furthermore, the high-temperature refrigeration cycle loop 1 also includes a high-temperature condenser 14 disposed between the high-temperature compressor 11 and the switching valve 17.

[0181] Furthermore, the high-temperature stage refrigeration cycle loop 1 also includes a high-temperature stage return pipe 13 located between the high-temperature stage compressor 11 and the evaporator 12. The first refrigerant flowing through the first throttling device 161 and the second throttling device 162 exchanges heat with the first refrigerant flowing through the high-temperature stage return pipe 13, thereby utilizing the first refrigerant in the high-temperature stage return pipe 13 to cool down the first refrigerant in the first throttling device 161 and the second throttling device 162, increasing the refrigeration capacity, and raising the suction temperature of the high-temperature stage compressor 11 to about the ambient temperature, thereby improving the refrigeration efficiency of the high-temperature stage compressor 11 and improving the working efficiency of the high-temperature stage refrigeration cycle loop 1.

[0182] Preferably, both the first throttling device 161 and the second throttling device 162 are capillary tubes.

[0183] The high-temperature return pipe 13 is thermally connected to the first throttling device 161 and the second throttling device 162 by means of mutual insertion or contact, so as to facilitate the heat exchange efficiency of the first refrigerant flowing in the two and improve the energy utilization rate.

[0184] Furthermore, the high-temperature refrigeration cycle loop 1 also includes a high-temperature drying filter 18 disposed between the high-temperature condenser 14 and the parallel branch, and a liquid storage bag 19 disposed between the evaporator 12 and the high-temperature return gas pipe 13.

[0185] The low-temperature stage refrigeration cycle loop 2 also includes a low-temperature stage throttling device 23 and a first return gas pipe section 25, and the condenser section 21 is located between the low-temperature stage compressor 22 and the low-temperature stage throttling device 23.

[0186] Furthermore, the second refrigerant flowing through the first return gas pipe section 25 exchanges heat with the second refrigerant flowing through the low-temperature stage throttling device 23, thereby allowing the second refrigerant flowing through the first return gas pipe section 25 to absorb the heat of the second refrigerant flowing through the low-temperature stage throttling device 23, increasing the temperature of the second refrigerant flowing to the suction port of the low-temperature stage compressor 22, thereby increasing the suction temperature of the low-temperature stage compressor 22, and also increasing the energy utilization rate of the low-temperature stage refrigeration cycle loop 2, thus improving the energy efficiency of the entire refrigeration device.

[0187] Preferably, the low-temperature stage throttling device 23 is a capillary tube, and the first return gas pipe section 25 is connected to or attached to the low-temperature stage throttling device 23 to facilitate the heat exchange efficiency of the second refrigerant flowing between them and improve energy utilization.

[0188] Furthermore, the low-temperature refrigeration cycle 2 also includes a second return gas pipe section 26 and a heat release pipe section 27. The second return gas pipe section 26 is located between the low-temperature evaporator 24 and the low-temperature compressor 22, and the heat release pipe section 27 is located between the low-temperature compressor 22 and the condenser section 21. The second refrigerant flowing through the second return gas pipe section 26 exchanges heat with the second refrigerant flowing through the heat release pipe section 27. This allows the second refrigerant flowing through the second return gas pipe section 26 to absorb the heat of the second refrigerant flowing through the heat release pipe section 27, increasing the suction temperature of the low-temperature compressor 22 and reducing the amount of cooling energy of the second refrigerant flowing from the heat release pipe section 27 to the condenser section 21. This enables the low-temperature refrigeration cycle 2 to achieve a lower temperature, allowing the second storage compartment to be temperature-adjustable within the range of -60 to -20°C. It also improves the energy utilization rate of the low-temperature refrigeration cycle 2 and enhances the overall energy efficiency of the refrigeration system.

[0189] Preferably, the second return gas pipe section 26 is located between the first return gas pipe section 25 and the low-temperature stage compressor 22, which can maximize the energy utilization rate of the low-temperature stage refrigeration cycle loop 2.

[0190] The second return gas pipe section 26 and the heat release pipe section 27 are connected or attached to each other to facilitate the heat exchange efficiency of the second refrigerant flowing between them and improve energy utilization.

[0191] Furthermore, the low-temperature refrigeration cycle 2 also includes a low-temperature heat dissipation pipe 28 disposed between the low-temperature compressor 22 and the heat dissipation tube section 27, and a low-temperature dryer filter 29 disposed between the condenser section 21 and the low-temperature throttling device 23. The low-temperature heat dissipation pipe 28 dissipates heat from the second refrigerant flowing out of the low-temperature compressor 22, thereby enabling the low-temperature refrigeration cycle 2 to achieve a lower temperature; the low-temperature dryer filter 29 dries and filters the second refrigerant flowing out of the condenser section 21.

[0192] Example 2

[0193] Please refer to Figure 2 As shown, this is the second embodiment of the present invention, which differs from Embodiment 1 only in that:

[0194] The parallel branch also includes a third throttling device 163 connected in parallel with the second throttling device 162. The switching valve 17 can be selectively connected to at least one of the first cooling branch, the second throttling device 162, and the third throttling device 163. In addition, the first refrigerant flowing through the third throttling device 163 does not exchange heat with the first refrigerant flowing through the high-temperature stage return pipe 13.

[0195] In this way, when the low-temperature stage compressor 22 starts, the first refrigerant can flow in the third throttling device 163. Compared with the first refrigerant flowing in the second throttling device 162, the starting pressure of the refrigeration system at the moment of starting the low-temperature stage compressor 22 can be further reduced, and the flow rate of the first refrigerant in the second throttling device 162 can be avoided due to the first refrigerant flowing into the high-temperature stage return pipe 13 and exchanging heat with the second throttling device 162.

[0196] Preferably, the third throttling device 163 is a capillary tube.

[0197] The second embodiment is the same as the first embodiment except for the differences mentioned above, and will not be repeated here.

[0198] Compared with the prior art, the refrigeration device and its control method provided by the present invention have the following advantages: When the first refrigerant flows in the first cooling branch, the high-temperature evaporator 15 cools the first storage room; when the first refrigerant flows in the second cooling branch, the first refrigerant flowing through the evaporation section 12 exchanges heat with the second refrigerant flowing through the condensation section 21. The first refrigerant in the evaporation section 12 can absorb the heat of the second refrigerant flowing through the condensation section 21, thereby further reducing the temperature of the second refrigerant in the condensation section 21, pre-cooling the low-temperature refrigeration cycle loop 2, so that the low-temperature refrigeration cycle loop 2 can achieve a lower temperature; in addition, the flow direction of the first refrigerant and the start / stop status of the high-temperature compressor 11 and the low-temperature compressor 22 can be controlled according to the temperature in the first storage room and the temperature in the second storage room, thereby realizing the cooling control of the first storage room and the second storage room as needed, avoiding energy waste while meeting the cooling demand.

[0199] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0200] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A refrigeration apparatus, characterized by comprising: comprising, a high-temperature stage refrigeration cycle circuit including a high-temperature stage compressor, a switching valve and a parallel branch, a first refrigerant flowing in the high-temperature stage refrigeration cycle circuit, the parallel branch including a first cooling supply branch and a second cooling supply branch arranged in parallel, the first cooling supply branch including a high-temperature stage evaporator, the second cooling supply branch including an evaporating portion, the switching valve selectively communicating with at least one of the first cooling supply branch and the second cooling supply branch; a low-temperature stage refrigeration cycle circuit including a low-temperature stage compressor and a condensing portion, a second refrigerant flowing in the low-temperature stage refrigeration cycle circuit, the second refrigerant flowing through the condensing portion exchanging heat with the first refrigerant flowing through the evaporating portion; a cabinet having a first storage compartment and a second storage compartment, the high-temperature stage refrigeration cycle circuit supplying cooling to the first storage compartment, the low-temperature stage refrigeration cycle circuit supplying cooling to the second storage compartment, a first temperature sensor arranged in the first storage compartment, a second temperature sensor arranged in the second storage compartment; a controller configured to, if the switching valve communicates with the first cooling supply branch and the second cooling supply branch at the same time and the high-temperature stage compressor and the low-temperature stage compressor are both in operation, timing a duration that the switching valve is in a state of communicating with the first cooling supply branch and the second cooling supply branch at the same time; If the temperature T2 monitored by the second temperature sensor falls to the preset shutdown temperature T 2关 of the second storage compartment within a preset time t1, then it is determined whether the temperature T1 monitored by the first temperature sensor satisfies a first preset condition; wherein the first preset condition is that the time T1 is greater than or equal to the preset startup temperature T 1开 of the first storage compartment, or the preset shutdown temperature T 1关 of the first storage compartment at the time T1 is less than T 1开 , and T1 has always been greater than T 1关 before the time T1. if yes, controlling the low-temperature stage compressor to stop and controlling the switching valve to switch to communicating with only the first cooling supply branch.

2. The refrigeration appliance of claim 1, wherein, The controller is further configured to, if T1 does not satisfy the first preset condition, controlling the low-temperature stage compressor and the high-temperature stage compressor to both stop.

3. The refrigeration appliance of claim 1, wherein, The controller is further configured to, If T1 and T2 satisfy: T1≤T 1关 , and T2>T 2关 , within a preset time t1, the switching valve is controlled to switch to only communicate with the second cold supply branch.

4. The refrigeration device according to claim 1, wherein After a preset time t1, if T1>T 1关 , and T2>T 2关 , the switching valve is controlled to switch to communicate with only the second cold supply branch.

5. The refrigeration appliance of claim 1, wherein, The controller is further configured to, if the temperature signal of the first temperature sensor cannot be acquired, controlling the switching valve to switch to communicating with the first cooling supply branch and controlling the high-temperature stage compressor to start; after a preset time t2, controlling the high-temperature stage compressor to stop; Wherein, the preset temperature T of the first storage chamber 1y = 6~10 ℃, control t2 = 3 min; T 1y = 1 ~ 5 ℃, control t2 = 4 min; T 1y = -4 ~ 0 °C, control t2 = 5 min; T 1y = -9 ~ -5 ℃, control t2 = 6 min; T 1y = -13 ~ -10 °C, control t2 = 7 min; T 1y = -17 ~ -14 °C, control t2 = 8 min; T 1y = -21 ~ -18 °C, control t2 = 9 min; T 1y = -24 ~ -22 °C, control t2 = 10 min; T 1y = -27 ~ -25 °C, control t2 = 11 min; T 1y = -30 to -28°C, control t2 = 12 min.

6. The refrigeration appliance of claim 1, wherein, The controller is further configured to, if the temperature signal of the second temperature sensor cannot be acquired, controlling the switching valve to switch to communicating with the second cooling supply branch and controlling the low-temperature stage compressor to start; after a preset time t3, controlling the low-temperature stage compressor to stop. Wherein, the preset temperature T of the second storage chamber 2y = -24 ~ -20 ℃, control t3 = 4 min; T 2y = -29 to -25°C, control t3 = 5 min; T 2y = -34 to -30°C, control t3 = 6 min; T 2y = -39 to -35°C, control t3 = 7 min; T 2y = -43 to -40°C, control t3 = 8 min; T 2y = -47 to -44°C, control t3 = 9 min; T 2y = -51 to -48°C, control t3 = 10 min; T 2y = -54 to -52°C, control t3 = 11 min; T 2y = -57 to -55°C, control t3 = 12 min; T 2y = -60 to -58°C, control t3 = 13 min.

7. A control method of the refrigerating apparatus as claimed in claim 1, characterized by, The control method comprises, if the switching valve communicates with the first cooling supply branch and the second cooling supply branch at the same time and the high-temperature stage compressor and the low-temperature stage compressor are both in operation, timing a duration that the switching valve is in a state of communicating with the first cooling supply branch and the second cooling supply branch at the same time; If T2 falls to T 2关 , within a preset time t1, whether T1 satisfies a first preset condition is determined; wherein the first preset condition is that T1≥T 1开 at the moment, or T 1关 <T1<T 1开 at the moment, and T1 is always greater than T 1关 before the moment. if yes, controlling the low-temperature stage compressor to stop and controlling the switching valve to switch to communicating with only the first cooling supply branch.

8. The control method of the refrigerating apparatus according to claim 7, characterized by, The control method further comprises, if T1 does not satisfy the first preset condition, controlling the low-temperature stage compressor and the high-temperature stage compressor to both stop.

9. The control method of the refrigerating apparatus according to claim 7, characterized by, The control method further comprises, If T1 and T2 satisfy: T1≤T 1关 , and T2>T 2关 , within a preset time t1, the high-temperature stage compressor is controlled to stop, and the switching valve is controlled to switch to communicate with only the second cold supply branch.

10. The control method of the refrigerating apparatus according to claim 7, characterized by, The control method further comprises, After a preset time t1, if T1>T 1关 , and T2>T 2关 , the switching valve is controlled to switch to communicate with only the second cold supply branch.

11. The control method of the refrigerating apparatus according to claim 7, characterized by, The control method further comprises, The control method further comprises, when the temperature signal of the first temperature sensor cannot be acquired, controlling the switching valve to switch to communicate with the first cooling branch, and controlling the high-temperature stage compressor to start; after a preset time t2, controlling the high-temperature stage compressor to stop; Wherein, the preset temperature T of the first storage chamber 1y = 6~10 ℃, control t2 = 3 min; T 1y = 1-5°C, control t2 = 4 min; T 1y = -4 ~ 0 °C, control t2 = 5 min; T 1y = -9 ~ -5 °C, control t2 = 6 min; T 1y = -13 to -10°C, control t2 = 7 min; T 1y = -17 ~ -14 °C, control t2 = 8 min; T 1y = -21 to -18°C, control t2 = 9 min; T 1y = -24 ~ -22 °C, control t2 = 10 min; T 1y = -27 ~ -25 °C, control t2 = 11 min; T 1y = -30 to -28°C, control t2 = 12 min.

12. The control method of the refrigerating apparatus according to claim 7, characterized by, the control method further comprises, when the temperature signal of the second temperature sensor cannot be acquired, controlling the switching valve to switch to communicate with the second cooling branch, and controlling the low-temperature stage compressor to start; after a preset time t3, controlling the low-temperature stage compressor to stop; Wherein, the preset temperature T of the second storage chamber 2y = -24 ~ -20 ℃, control t3 = 4 min; T 2y = -29 to -25°C, control t3 = 5 min; T 2y = -34 to -30°C, control t3 = 6 min; T 2y = -39 to -35°C, control t3 = 7 min; T 2y = -43 to -40°C, control t3 = 8 min; T 2y = -47 to -44°C, control t3 = 9 min; T 2y = -51 to -48°C, control t3 = 10 min; T 2y = -54 to -52°C, control t3 = 11 min; T 2y = -57 to -55°C, control t3 = 12 min; T 2y = -60 to -58°C, control t3 = 13 min.

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