CN117366896A - Refrigerating system, refrigerating device and control method thereof - Google Patents

Abstract

The invention provides a refrigerating system, a refrigerating device and a control method thereof, wherein the refrigerating system comprises a high-temperature-level refrigerating circulation loop and a low-temperature-level refrigerating circulation loop, the high-temperature-level refrigerating circulation loop comprises a high-temperature-level compressor, a high-temperature-level throttling device, an evaporation assembly and a high-temperature-level air return pipe which are mutually arranged in series, the evaporation assembly comprises a high-temperature-level evaporator and an evaporation part which are arranged in series, a first refrigerant flows in the high-temperature-level refrigerating circulation loop, and the first refrigerant flowing through the high-temperature-level throttling device exchanges heat with the first refrigerant flowing through the high-temperature-level air return pipe; the low-temperature-stage refrigeration cycle loop comprises a low-temperature-stage compressor and a condensation part, wherein a second refrigerant flows in the low-temperature-stage refrigeration cycle loop, and the second refrigerant flowing through the condensation part exchanges heat with the first refrigerant flowing through the evaporation part. The invention can solve the problem that the existing refrigerating device can not meet the classification storage of various food materials.

Description

Refrigerating system, refrigerating device and control method thereof

Technical Field

The invention relates to the technical field of refrigeration equipment, in particular to a refrigeration system, a refrigeration device with the refrigeration system and a control method of the refrigeration device.

Background

Along with the improvement of economic level, the transportation is more and more convenient, and cold chain transportation also has grown, and the food materials of different areas even different countries gradually get into market supermarkets to walk into the family dining table, but the different food materials can store the time length of its difference under different storage conditions, and even the fresh degree of food materials also can change along with the change of storage conditions, consequently, need to carry out categorised storage to different kinds of food materials.

The storage effect of different food materials is mainly related to temperature, but the existing refrigerating device only has a storage room with a single temperature area, and cannot meet the classification storage of various food materials.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a refrigerating system, a refrigerating device with the refrigerating system and a control method of the refrigerating device, so as to solve the problem that the existing refrigerating device cannot meet the classification storage of various food materials.

To achieve one of the above objects, an embodiment of the present invention provides a refrigeration system, comprising,

the high-temperature-stage refrigeration cycle loop comprises a high-temperature-stage compressor, a high-temperature-stage throttling device, an evaporation assembly and a high-temperature-stage air return pipe, wherein the high-temperature-stage compressor, the high-temperature-stage throttling device and the evaporation assembly are mutually arranged in series, the high-temperature-stage air return pipe is used for connecting the evaporation assembly with the high-temperature-stage compressor, the evaporation assembly comprises a high-temperature-stage evaporator and an evaporation part which are arranged in series, a first refrigerant flows in the high-temperature-stage refrigeration cycle loop, and the first refrigerant flowing through the high-temperature-stage throttling device exchanges heat with the first refrigerant flowing through the high-temperature-stage air return pipe;

the low-temperature-stage refrigeration cycle loop comprises a low-temperature-stage compressor and a condensation part, wherein a second refrigerant flows in the low-temperature-stage refrigeration cycle loop, and the second refrigerant flowing through the condensation part exchanges heat with the first refrigerant flowing through the evaporation part.

In order to achieve one of the above objects, an embodiment of the present invention further provides a refrigeration apparatus, which includes a box, and further includes the refrigeration system described above, wherein the box has a first storage compartment and a second storage compartment, the high-temperature-stage refrigeration cycle circuit cools the first storage compartment, and the low-temperature-stage refrigeration cycle circuit cools the second storage compartment.

As a further improvement of an embodiment of the present invention, the refrigeration apparatus further comprises a controller, the controller being configured to,

if the high-temperature-stage compressor is in an operating state and the low-temperature-stage compressor is in a stop state, timing the operating time of the high-temperature-stage compressor;

within a preset time T1, if T ₁ Down to its preset shutdown temperature T _{1 switch} Then judge T ₂ Whether a first preset condition is met;

if yes, controlling the low-temperature-stage compressor to start;

if not, controlling the high-temperature-stage compressor to stop;

wherein, the first preset condition is: at time T ₂ ≥T _{2 open} Or, at this time, the preset shutdown temperature T of the second storage compartment _{2-pass valve} <T ₂ <T _{2 open} And before this moment T ₂ Always greater than T _{2-pass valve} 。

As a further improvement of an embodiment of the present invention, the refrigeration apparatus further comprises a controller, the controller being configured to,

if the high-temperature-stage compressor is in an operating state and the low-temperature-stage compressor is in a stop state, timing the operating time of the high-temperature-stage compressor;

after a preset time T1, if T ₁ The temperature T is not reduced to the preset shutdown temperature T of the first storage compartment _{1 switch} Or below, then determine T ₂ Whether a second preset condition is met;

if yes, controlling the low-temperature-stage compressor to start;

if not, the running time of the high-temperature-stage compressor is reckoned;

the second preset condition is: at time T ₂ ≥T _{2 open} Alternatively, the time T _{2-pass valve} <T ₂ <T _{2 open} And T is within T1 ₂ Always greater than T _{2-pass valve} 。

As a further improvement of an embodiment of the present invention, the refrigeration apparatus further comprises a controller, the controller being configured to,

if the high-temperature-stage compressor and the low-temperature-stage compressor are both in an operating state, timing the operating time of the low-temperature-stage compressor;

within a preset time T2, if T ₂ Down to its preset shutdown temperature T _{2-pass valve} Controlling the low-temperature-stage compressor to stop and judging T ₁ Whether a third preset condition is met;

if not, controlling the high-temperature-stage compressor to stop;

wherein, the third preset condition is: at time T ₁ ≥T _{1 open} Or, at this time, the preset shutdown temperature T of the first storage compartment _{1 switch} <T ₁ <T _{1 open} And before this moment T ₁ Always greater than T _{1 switch} 。

As a further improvement of an embodiment of the present invention, the refrigeration apparatus further comprises a controller, the controller being configured to,

if the high-temperature-stage compressor and the low-temperature-stage compressor are both in an operating state, timing the operating time of the low-temperature-stage compressor;

after a preset time T2, if T ₂ The temperature T is not reduced to the preset shutdown temperature T of the second storage compartment _{2-pass valve} Or below, the run time of the low temperature stage compressor is re-timed.

In order to achieve one of the above objects, an embodiment of the present invention also provides a control method of a refrigeration apparatus, the control method including,

if the high-temperature-stage compressor is in an operating state and the low-temperature-stage compressor is in a stop state, timing the operating time of the high-temperature-stage compressor;

within a preset time T1, if T ₁ Down to its preset shutdown temperature T _{1 switch} Then judge T ₂ Whether a first preset condition is met;

if yes, controlling the low-temperature-stage compressor to start;

if not, controlling the high-temperature-stage compressor to stop;

wherein, the first preset condition is: at time T ₂ ≥T _{2 open} Or, at this time, the preset shutdown temperature T of the second storage compartment _{2-pass valve} <T ₂ <T _{2 open} And before this moment T ₂ Always greater than T _{2-pass valve} 。

As a further improvement of one embodiment of the present invention, the control method further includes,

if the high-temperature-stage compressor is in an operating state and the low-temperature-stage compressor is in a stop state, timing the operating time of the high-temperature-stage compressor;

after a preset time T1, if T ₁ The temperature T is not reduced to the preset shutdown temperature T of the first storage compartment _{1 switch} Or below, then determine T ₂ Whether a second preset condition is met;

if yes, controlling the low-temperature-stage compressor to start;

if not, the running time of the high-temperature-stage compressor is reckoned;

the second preset condition is: at time T ₂ ≥T _{2 open} Alternatively, the time T _{2-pass valve} <T ₂ <T _{2 open} And T is within T1 ₂ Always greater than T _{2-pass valve} 。

As a further improvement of one embodiment of the present invention, the control method further includes,

if the high-temperature-stage compressor and the low-temperature-stage compressor are both in an operating state, timing the operating time of the low-temperature-stage compressor;

within a preset time T2, if T ₂ Down to its preset shutdown temperature T _{2-pass valve} Controlling the low-temperature-stage compressor to stop and judging T ₁ Whether a third preset condition is met;

if not, controlling the high-temperature-stage compressor to stop;

wherein, the third preset condition is: at time T ₁ ≥T _{1 open} Or, at this time, the preset shutdown temperature T of the first storage compartment _{1 switch} <T ₁ <T _{1 open} And before this moment T ₁ Always greater than T _{1 switch} 。

As a further improvement of one embodiment of the present invention, the control method further includes,

if the high-temperature-stage compressor and the low-temperature-stage compressor are both in an operating state, timing the operating time of the low-temperature-stage compressor;

after a preset time T2, if T ₂ The temperature T is not reduced to the preset shutdown temperature T of the second storage compartment _{2-pass valve} Or below, the run time of the low temperature stage compressor is re-timed.

Compared with the prior art, the invention has the following beneficial effects: according to the refrigerating system, the refrigerating device with the refrigerating system and the control method of the refrigerating device, when the first refrigerant circulates in the high-temperature-stage refrigerating circulation loop, the high-temperature-stage evaporator cools the first storage compartment, the first refrigerant flowing through the evaporating part exchanges heat with the second refrigerant flowing through the condensing part, and the first refrigerant in the evaporating part can absorb heat of the second refrigerant flowing through the condensing part, so that the temperature of the second refrigerant in the condensing part can be further reduced, and the low-temperature-stage refrigerating circulation loop is precooled, so that the low-temperature-stage refrigerating circulation loop can realize lower temperature; the first refrigerant flowing through the high-temperature-stage throttling device exchanges heat with the first refrigerant flowing through the high-temperature-stage air return pipe, so that the first refrigerant in the high-temperature-stage air return pipe can be utilized to cool the first refrigerant in the high-temperature-stage throttling device, the refrigerating capacity is increased, the air suction temperature of the high-temperature-stage compressor is increased to the right of a ring Wen Zuo, the refrigerating efficiency of the high-temperature-stage compressor is improved, and the working efficiency of a high-temperature-stage refrigerating cycle loop is improved.

Drawings

Fig. 1 is a schematic structural diagram of an cascade compression refrigeration system according to an embodiment of the invention.

Fig. 2 is a schematic structural diagram of an cascade compression refrigeration system according to another embodiment of the invention.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings.

In the various illustrations of the invention, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for convenience of illustration, and thus serve only to illustrate the basic structure of the inventive subject matter.

It will be understood that, although the terms first, second, etc. may be used herein to describe various elements or structures, these described elements should not be limited by these terms. These terms are only used to distinguish one such descriptive object from another.

The refrigerating device provided by the embodiment of the invention comprises a box body and a door body, wherein the box body is internally provided with a storage compartment, the door body is used for opening or closing the storage compartment, and the refrigerating device further comprises a refrigerating system which is arranged in the box body and supplies cold to the storage compartment. Specifically, the refrigerating device can be set as a refrigerator, a freezer and the like so as to meet the requirements of different users and different application scenes.

In this embodiment, the case has a first storage compartment and a second storage compartment, where the first storage compartment may be a refrigeration compartment or a freezing compartment, and the second storage compartment may be a temperature-changing compartment or a cryogenic compartment. The refrigeration system adopts an cascade compression refrigeration system 100, and specifically comprises a high-temperature-stage refrigeration cycle loop 1 and a low-temperature-stage refrigeration cycle loop 2.

For convenience of description, in this embodiment, the high-temperature-stage refrigeration cycle 1 is used to cool the first storage compartment, and the low-temperature-stage refrigeration cycle 2 is used to cool the second storage compartment. Of course, the two may be interchanged.

Of course, in other embodiments, other storage compartments besides the first storage compartment and the second storage compartment may be provided according to actual needs.

Referring to fig. 1 and 2, the high-temperature-stage refrigeration cycle 1 includes a high-temperature-stage compressor 11, a high-temperature-stage throttling device 16, an evaporation assembly, and a high-temperature-stage muffler 13 connecting the evaporation assembly and the high-temperature-stage compressor 11, wherein the evaporation assembly includes a high-temperature-stage evaporator 15 and an evaporation portion 12, which are disposed in series, a first refrigerant flows through the high-temperature-stage throttling device 16 and exchanges heat with the first refrigerant flowing through the high-temperature-stage muffler 13, and the first refrigerant flows through the high-temperature-stage muffler 1. Thus, the first storage compartment can realize a temperature range of-30 to-10 ℃.

The low-temperature-stage refrigeration cycle 2 includes a low-temperature-stage compressor 22 and a condensation unit 21, and a second refrigerant flows through the low-temperature-stage refrigeration cycle 2, and the second refrigerant flowing through the condensation unit 21 exchanges heat with the first refrigerant flowing through the evaporation unit 12.

In this way, when the first refrigerant circulates in the high-temperature-stage refrigeration cycle 1, the high-temperature-stage evaporator 15 cools the first storage compartment, the first refrigerant flowing through the evaporation portion 12 exchanges heat with the second refrigerant flowing through the condensation portion 21, and the first refrigerant in the evaporation portion 12 can absorb heat of the second refrigerant flowing through the condensation portion 21, so that the temperature of the second refrigerant in the condensation portion 21 can be further reduced, and the low-temperature-stage refrigeration cycle 2 is precooled, so that the low-temperature-stage refrigeration cycle 2 can realize a lower temperature; the first refrigerant flowing through the high-temperature-stage throttling device 16 exchanges heat with the first refrigerant flowing through the high-temperature-stage air return pipe 13, so that the first refrigerant in the high-temperature-stage throttling device 16 can be cooled by the first refrigerant in the high-temperature-stage air return pipe 13, the refrigerating capacity is increased, the suction temperature of the high-temperature-stage compressor 11 is increased to the right of a ring Wen Zuo, the refrigerating efficiency of the high-temperature-stage compressor 11 is improved, and the working efficiency of the high-temperature-stage refrigeration cycle 1 is improved.

Referring to fig. 1, specifically, the high temperature-stage evaporator 15 is disposed between the high temperature-stage throttling device 16 and the evaporation portion 12, so that the high temperature-stage evaporator 15 cools the first storage compartment, the refrigeration efficiency of the first storage compartment is high, and then the first refrigerant flows out from the high temperature-stage evaporator 15 to the evaporation portion 12 and exchanges heat with the second refrigerant in the condensation portion 21, and precools the low temperature-stage refrigeration cycle 2.

Referring to fig. 2, in other embodiments, the evaporation portion 12 may be disposed between the high-temperature-stage evaporator 15 and the high-temperature-stage muffler 13, so that when the first refrigerant flows through the evaporation portion 12, the amount of cold exchanged with the condensation portion 21 is large, and the temperature of the second refrigerant in the condensation portion 21 can be greatly reduced, so that the low-temperature-stage refrigeration cycle 2 can achieve a lower temperature; thereafter, the first refrigerant flows out from the evaporation portion 12 to the high-temperature-stage evaporator 15 and cools the first storage compartment.

Preferably, the high temperature stage restriction 16 is a capillary tube.

The high-temperature-stage throttling device 16 and the high-temperature-stage air return pipe 13 are in thermal connection in a mutually sleeved or abutting mode, so that heat exchange efficiency of the first refrigerant flowing in the high-temperature-stage throttling device and the high-temperature-stage air return pipe is facilitated, and energy utilization rate is improved.

Further, the high-temperature-stage refrigeration cycle 1 further includes a high-temperature-stage dry filter 17 provided between the high-temperature-stage condenser 14 and the high-temperature-stage throttle device 16, and a liquid-storage bag 18 provided between the high-temperature-stage evaporator 15 and the high-temperature-stage muffler 13.

The low-temperature-stage refrigeration cycle 2 includes a low-temperature-stage compressor 22, a low-temperature-stage throttling device 23, a low-temperature-stage evaporator 24, and a first return air pipe section 25, which are arranged in series, and the condensing portion 21 is provided between the low-temperature-stage compressor 22 and the low-temperature-stage throttling device 23.

Further, the second refrigerant flowing through the first air return pipe section 25 exchanges heat with the second refrigerant flowing through the low-temperature-stage throttling device 23. Thereby, the second refrigerant flowing through the first air return pipe section 25 can absorb the heat of the second refrigerant flowing through the low-temperature-stage throttling device 23, and the temperature of the second refrigerant flowing to the suction inlet of the low-temperature-stage compressor 22 is increased, so that the suction temperature of the low-temperature-stage compressor 22 is increased, the energy utilization rate of the low-temperature-stage refrigeration cycle 2 is increased, and the energy efficiency of the whole refrigeration device is improved.

Preferably, the low-temperature-stage throttling device 23 is a capillary tube, and the first air return pipe section 25 and the low-temperature-stage throttling device 23 are mutually sleeved or abutted, so that the heat exchange efficiency of the second refrigerant flowing in the two is facilitated, and the energy utilization rate is improved.

Further, the low-temperature-stage refrigeration cycle 2 further includes a second air return pipe section 26 and a heat release pipe section 27, the second air return pipe section 26 is provided between the low-temperature-stage evaporator 24 and the low-temperature-stage compressor 22, the heat release pipe section 27 is provided between the low-temperature-stage compressor 22 and the condensing portion 21, and the second refrigerant flowing through the second air return pipe section 26 exchanges heat with the second refrigerant flowing through the heat release pipe section 27. Therefore, the second refrigerant flowing through the second air return pipe section 26 can absorb the heat of the second refrigerant flowing through the heat release pipe section 27, the suction temperature of the low-temperature-stage compressor 22 is increased, the cold energy of the second refrigerant flowing from the heat release pipe section 27 to the condensation part 21 is reduced, the low-temperature-stage refrigeration cycle 2 can achieve lower temperature, the temperature of the second storage compartment can be adjusted within the temperature range of-60 to-20 ℃, the energy utilization rate of the low-temperature-stage refrigeration cycle 2 is increased, and the energy efficiency of the whole refrigeration device is improved.

Preferably, the second return air pipe section 26 is located between the first return air pipe section 25 and the low temperature stage compressor 22, so that the energy utilization rate of the low temperature stage refrigeration cycle 2 can be maximally improved.

The second air return pipe section 26 and the heat release pipe section 27 are mutually sleeved or abutted, so that the heat exchange efficiency of the second refrigerant flowing in the two is facilitated, and the energy utilization rate is improved.

Further, the low-temperature-stage refrigeration cycle 2 further includes a low-temperature-stage radiating pipe 28 provided between the low-temperature-stage compressor 22 and the radiator pipe section 27, and a low-temperature-stage drier-filter 29 provided between the condensing portion 21 and the low-temperature-stage throttling device 23. The second refrigerant flowing out of the low-temperature stage compressor 22 can be radiated by the low-temperature stage radiating pipe 28, so that the low-temperature stage refrigeration cycle 2 can achieve a lower temperature; the second refrigerant flowing out of the condensation unit 21 can be dried and filtered by the low-temperature-stage dry filter 29.

The first refrigerant and the second refrigerant may be the same refrigerant or may be different refrigerants.

In addition, the "high temperature" and "low temperature" in the "high temperature-stage refrigeration cycle 1" and the "low temperature-stage refrigeration cycle 2" are relatively speaking, and the evaporation temperature of the first refrigerant flowing through the high temperature-stage refrigeration cycle 1 is relatively higher than the evaporation temperature of the second refrigerant flowing through the low temperature-stage refrigeration cycle 2.

Preferably, the high-temperature-stage compressor 11 and the low-temperature-stage compressor 22 are variable-frequency compressors, so that the operating frequencies of the high-temperature-stage compressor 11 and the low-temperature-stage compressor 22 can be adjusted according to the temperatures of different storage compartments, so that the high-temperature-stage refrigeration cycle loop 1 and the low-temperature-stage refrigeration cycle loop 2 generate the cold energy required by the corresponding storage compartments, and the operation pressure of the refrigeration system is prevented from being excessively large.

Further, the refrigeration device also comprises a controller for controlling the air conditioner to control the air conditioner to cool,

if the high-temperature-stage compressor 11 is in an operating state and the low-temperature-stage compressor 22 is in a stopped state, timing the operating time of the high-temperature-stage compressor 11;

within a preset time T1, if T ₁ Down to its preset shutdown temperature T _{1 switch} Then judge T ₂ Whether a first preset condition is met;

if yes, the low temperature stage compressor 22 is controlled to start;

if not, controlling the high-temperature-stage compressor 11 to stop;

wherein, the first preset condition is: at time T ₂ ≥T _{2 open} Or, at this time, the preset shutdown temperature T of the second storage compartment _{2-pass valve} <T ₂ <T _{2 open} And before this moment T ₂ Always greater than T _{2-pass valve} 。

That is, if the high temperature stage compressor 11 is in an operating state and the low temperature stage compressor 22 is in a shutdown state, by timing the operation time of the high temperature stage compressor 11, that is, timing the time of cooling the first storage compartment by the high temperature stage evaporator 15, during which the first refrigerant flowing through the evaporation portion 12 exchanges heat with the second refrigerant flowing through the condensation portion 21, the first refrigerant in the evaporation portion 12 can absorb the heat of the second refrigerant flowing through the condensation portion 21, so that the temperature of the second refrigerant in the condensation portion 21 can be further reduced, and the low temperature stage refrigeration cycle 2 is pre-cooled; judging the temperature of the second storage compartment if the temperature in the first storage compartment is reduced to the preset shutdown temperature and refrigeration is not needed within the preset time t1, and controlling the low-temperature compressor 22 to start to cool the second storage compartment if the temperature of the second storage compartment meets the first preset condition, namely the second storage compartment needs refrigeration within the preset time t 1; if not, the second storage compartment does not need to be refrigerated, and the high-temperature-stage compressor 11 can be controlled to be stopped at the moment so as to save energy consumption.

Preferably, t1=5 to 20min, on the one hand, by this period of time, the evaporating portion 12 can provide enough cold energy for the low-temperature-stage refrigeration cycle 2 in advance, and meanwhile, avoid that the second storage compartment cannot be cooled for a long time.

Further, the controller is also used for controlling the operation of the device,

if the high-temperature-stage compressor 11 is in an operating state and the low-temperature-stage compressor 22 is in a stopped state, timing the operating time of the high-temperature-stage compressor 11;

after a preset time T1, if T ₁ The temperature T is not reduced to the preset shutdown temperature T of the first storage compartment _{1 switch} Or below, and judge T ₂ Whether a second preset condition is met;

if yes, the low temperature stage compressor 22 is controlled to start;

if not, the operation time of the high-temperature-stage compressor 11 is counted again;

the second preset condition is: at time T ₂ ≥T _{2-pass valve} Alternatively, the time T _{2-pass valve} <T ₂ <T _{2 open} And T is within T1 ₂ Always greater than T _{2-pass valve} 。

That is, after the preset time t1, if the temperature of the first storage compartment does not fall to or below the preset shutdown temperature, it is first determined whether the temperature of the second storage compartment meets the second preset condition, that is, the startup condition of the second storage compartment, if yes, it is indicated that the second storage compartment needs to be refrigerated, and at this time, the low-temperature compressor 22 can be started to refrigerate the second storage compartment, so that the second storage compartment can realize a lower temperature; if not, the second storage compartment is not required to be refrigerated, at the moment, the high-temperature-stage compressor 11 can be controlled to continue to operate, the operation time of the high-temperature-stage compressor 11 is reckoned, and within the preset time T1, the time T is detected in real time ₁ Whether to drop to its preset shutdown temperature T _{1 switch} And at T ₁ Down to its preset shutdown temperature T _{1 switch} At the time, judge T ₂ Whether the first preset condition is satisfied.

Further, the controller is also used for controlling the operation of the device,

if both the high-temperature stage compressor 11 and the low-temperature stage compressor 22 are in an operating state, the operation time of the low-temperature stage compressor 22 is counted;

within a preset time T2, if T ₂ Down to its preset shutdown temperature T _{2-pass valve} The low-temperature stage compressor 22 is controlled to stop and T is judged ₁ Whether a third preset condition is met;

if not, controlling the high-temperature-stage compressor 11 to stop;

wherein, the third preset condition is: at time T ₁ ≥T _{1 open} Alternatively, the first storage compartment is pre-filled at that timeSet the shutdown temperature T _{1 switch} <T ₁ <T _{1 open} And before this moment T ₁ Always greater than T _{1 switch} 。

That is, if the high-temperature-level compressor 11 and the low-temperature-level compressor 22 are both in an operation state, that is, the first storage compartment and the second storage compartment are both in refrigeration, in the preset time t2, if the temperature of the second storage compartment is reduced to the preset shutdown temperature, it is indicated that the second storage compartment does not need to be refrigerated, at this time, the low-temperature-level compressor 22 can be controlled to be shut down so as to save energy consumption, at this time, whether the first storage compartment meets the third preset condition to judge whether the first storage compartment still needs to be refrigerated is judged, and if not, the high-temperature-level compressor 11 is controlled to be shut down so as to save energy consumption.

Preferably, t2=5-40 min, not only can provide enough cold energy for the second storage compartment, so that the temperature of the second storage compartment is effectively reduced, but also the first storage compartment can be prevented from being incapable of being cooled for a long time.

Further, the controller is also used for controlling the operation of the device,

if both the high-temperature stage compressor 11 and the low-temperature stage compressor 22 are in an operating state, the operation time of the low-temperature stage compressor 22 is counted;

after a preset time T2, if T ₂ The temperature T is not reduced to the preset shutdown temperature T of the second storage compartment _{2-pass valve} Or below, the run time of the low temperature stage compressor 22 is re-timed.

That is, if the high-temperature-level compressor 11 and the low-temperature-level compressor 22 are both in operation, that is, the first storage compartment and the second storage compartment are both refrigerating, after the preset time t2, if the temperature of the second storage compartment is not reduced to or below the preset shutdown temperature, the operation time of the low-temperature-level compressor 11 is counted again, so that the temperature of the second storage compartment is reduced to the preset temperature as soon as possible.

An embodiment of the present invention also provides a control method of the refrigerating apparatus as described above, which includes,

if the high-temperature-stage compressor 11 is in an operating state and the low-temperature-stage compressor 22 is in a stopped state, timing the operating time of the high-temperature-stage compressor 11;

within a preset time T1, if T ₁ Down to its preset shutdown temperature T _{1 switch} Then judge T ₂ Whether a first preset condition is met;

if yes, the low temperature stage compressor 22 is controlled to start;

if not, controlling the high-temperature-stage compressor 11 to stop;

wherein, the first preset condition is: at time T ₂ ≥T _{2 open} Or, at this time, the preset shutdown temperature T of the second storage compartment _{2-pass valve} <T ₂ <T _{2 open} And before this moment T ₂ Always greater than T _{2-pass valve} 。

That is, if the high temperature stage compressor 11 is in an operating state and the low temperature stage compressor 22 is in a shutdown state, by timing the operation time of the high temperature stage compressor 11, that is, timing the time of cooling the first storage compartment by the high temperature stage evaporator 15, during which the first refrigerant flowing through the evaporation portion 12 exchanges heat with the second refrigerant flowing through the condensation portion 21, the first refrigerant in the evaporation portion 12 can absorb the heat of the second refrigerant flowing through the condensation portion 21, so that the temperature of the second refrigerant in the condensation portion 21 can be further reduced, and the low temperature stage refrigeration cycle 2 is pre-cooled; judging the temperature of the second storage compartment if the temperature in the first storage compartment is reduced to the preset shutdown temperature and refrigeration is not needed within the preset time t1, and controlling the low-temperature compressor 22 to start to cool the second storage compartment if the temperature of the second storage compartment meets the first preset condition, namely the second storage compartment needs refrigeration within the preset time t 1; if not, the second storage compartment does not need to be refrigerated, and the high-temperature-stage compressor 11 can be controlled to be stopped at the moment so as to save energy consumption.

Preferably, t1=5 to 20min, on the one hand, by this period of time, the evaporating portion 12 can provide enough cold energy for the low-temperature-stage refrigeration cycle 2 in advance, and meanwhile, avoid that the second storage compartment cannot be cooled for a long time.

Further, the control method further comprises,

if the high-temperature-stage compressor 11 is in an operating state and the low-temperature-stage compressor 22 is in a stopped state, timing the operating time of the high-temperature-stage compressor 11;

after a preset time T1, if T ₁ The temperature T is not reduced to the preset shutdown temperature T of the first storage compartment _{1 switch} Or below, and judge T ₂ Whether a second preset condition is met;

if yes, the low temperature stage compressor 22 is controlled to start;

if not, the operation time of the high-temperature-stage compressor 11 is counted again;

the second preset condition is: at time T ₂ ≥T _{2-pass valve} Alternatively, the time T _{2-pass valve} <T ₂ <T _{2 open} And T is within T1 ₂ Always greater than T _{2-pass valve} 。

That is, after the preset time t1, if the temperature of the first storage compartment does not fall to or below the preset shutdown temperature, it is first determined whether the temperature of the second storage compartment meets the second preset condition, that is, the startup condition of the second storage compartment, if yes, it is indicated that the second storage compartment needs to be refrigerated, and at this time, the low-temperature compressor 22 can be started to refrigerate the second storage compartment, so that the second storage compartment can realize a lower temperature; if not, the second storage compartment is not required to be refrigerated, at the moment, the high-temperature-stage compressor 11 can be controlled to continue to operate, the operation time of the high-temperature-stage compressor 11 is reckoned, and within the preset time T1, the time T is detected in real time ₁ Whether to drop to its preset shutdown temperature T _{1 switch} And at T ₁ Down to its preset shutdown temperature T _{1 switch} At the time, judge T ₂ Whether the first preset condition is satisfied.

Further, the control method further comprises,

if both the high-temperature stage compressor 11 and the low-temperature stage compressor 22 are in an operating state, the operation time of the low-temperature stage compressor 22 is counted;

within a preset time T2, if T ₂ Down to its preset shutdown temperature T _{2-pass valve} The low-temperature stage compressor 22 is controlled to stop and T is judged ₁ Whether a third preset condition is met;

if not, controlling the high-temperature-stage compressor 11 to stop;

wherein, the third preset condition is: at time T ₁ ≥T _{1 open} Or, at this time, the preset shutdown temperature T of the first storage compartment _{1 switch} <T ₁ <T _{1 open} And before this moment T ₁ Always greater than T _{1 switch} 。

That is, if the high-temperature-level compressor 11 and the low-temperature-level compressor 22 are both in an operation state, that is, the first storage compartment and the second storage compartment are both in refrigeration, in the preset time t2, if the temperature of the second storage compartment is reduced to the preset shutdown temperature, it is indicated that the second storage compartment does not need to be refrigerated, at this time, the low-temperature-level compressor 22 can be controlled to be shut down so as to save energy consumption, at this time, whether the first storage compartment meets the third preset condition to judge whether the first storage compartment still needs to be refrigerated is judged, and if not, the high-temperature-level compressor 11 is controlled to be shut down so as to save energy consumption.

Preferably, t2=5-40 min, not only can provide enough cold energy for the second storage compartment, so that the temperature of the second storage compartment is effectively reduced, but also the first storage compartment can be prevented from being incapable of being cooled for a long time.

Further, the control method further comprises,

if both the high-temperature stage compressor 11 and the low-temperature stage compressor 22 are in an operating state, the operation time of the low-temperature stage compressor 22 is counted;

after a preset time T2, if T ₂ The temperature T is not reduced to the preset shutdown temperature T of the second storage compartment _{2-pass valve} Or below, the run time of the low temperature stage compressor 22 is re-timed.

That is, if the high-temperature-level compressor 11 and the low-temperature-level compressor 22 are both in operation, that is, the first storage compartment and the second storage compartment are both refrigerating, after the preset time t2, if the temperature of the second storage compartment is not reduced to or below the preset shutdown temperature, the operation time of the low-temperature-level compressor 11 is counted again, so that the temperature of the second storage compartment is reduced to the preset temperature as soon as possible.

Compared with the prior art, the refrigerating system, the refrigerating device with the refrigerating system and the control method of the refrigerating device provided by the invention have the beneficial effects that: when the first refrigerant circulates in the high-temperature-stage refrigeration cycle 1, the high-temperature-stage evaporator 15 cools the first storage compartment, the first refrigerant flowing through the evaporation part 12 exchanges heat with the second refrigerant flowing through the condensation part 21, and the first refrigerant in the evaporation part 12 can absorb heat of the second refrigerant flowing through the condensation part 21, so that the temperature of the second refrigerant in the condensation part 21 can be further reduced, and the low-temperature-stage refrigeration cycle 2 is precooled, so that the low-temperature-stage refrigeration cycle 2 can realize lower temperature; the first refrigerant flowing through the high-temperature-stage throttling device 16 exchanges heat with the first refrigerant flowing through the high-temperature-stage air return pipe 13, so that the first refrigerant in the high-temperature-stage throttling device 16 can be cooled by the first refrigerant in the high-temperature-stage air return pipe 13, the refrigerating capacity is increased, the suction temperature of the high-temperature-stage compressor 11 is increased to the right of a ring Wen Zuo, the refrigerating efficiency of the high-temperature-stage compressor 11 is improved, and the working efficiency of the high-temperature-stage refrigeration cycle 1 is improved.

It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.

The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.

Claims (10)

1. A refrigeration system, comprising,

the high-temperature-stage refrigeration cycle loop comprises a high-temperature-stage compressor, a high-temperature-stage throttling device, an evaporation assembly and a high-temperature-stage air return pipe, wherein the high-temperature-stage compressor, the high-temperature-stage throttling device and the evaporation assembly are mutually arranged in series, the high-temperature-stage air return pipe is used for connecting the evaporation assembly with the high-temperature-stage compressor, the evaporation assembly comprises a high-temperature-stage evaporator and an evaporation part which are arranged in series, a first refrigerant flows in the high-temperature-stage refrigeration cycle loop, and the first refrigerant flowing through the high-temperature-stage throttling device exchanges heat with the first refrigerant flowing through the high-temperature-stage air return pipe;

the low-temperature-stage refrigeration cycle loop comprises a low-temperature-stage compressor and a condensation part, wherein a second refrigerant flows in the low-temperature-stage refrigeration cycle loop, and the second refrigerant flowing through the condensation part exchanges heat with the first refrigerant flowing through the evaporation part.

2. A refrigeration device comprising a cabinet, and further comprising a refrigeration system according to claim 1, wherein the cabinet has a first storage compartment and a second storage compartment, the high-temperature-stage refrigeration cycle circuit cools the first storage compartment, and the low-temperature-stage refrigeration cycle circuit cools the second storage compartment.

3. The refrigeration unit of claim 2, further comprising a controller for,

if the high-temperature-stage compressor is in an operating state and the low-temperature-stage compressor is in a stop state, timing the operating time of the high-temperature-stage compressor;

within a preset time T1, if T ₁ Down to its preset shutdown temperature T _{1 switch} Then judge T ₂ Whether a first preset condition is met;

if yes, controlling the low-temperature-stage compressor to start;

if not, controlling the high-temperature-stage compressor to stop;

wherein, the first preset condition is: at time T ₂ ≥T _{2 open} Or, at this time, the preset shutdown temperature T of the second storage compartment _{2-pass valve} <T ₂ <T _{2 open} And before this moment T ₂ Always greater than T _{2-pass valve} 。

4. The refrigeration unit of claim 2, further comprising a controller for,

if the high-temperature-stage compressor is in an operating state and the low-temperature-stage compressor is in a stop state, timing the operating time of the high-temperature-stage compressor;

after a preset time T1, if T ₁ The temperature T is not reduced to the preset shutdown temperature T of the first storage compartment _{1 switch} Or below, then determine T ₂ Whether a second preset condition is met;

if yes, controlling the low-temperature-stage compressor to start;

if not, the running time of the high-temperature-stage compressor is reckoned;

the second preset condition is: at time T ₂ ≥T _{2 open} Alternatively, the time T _{2-pass valve} <T ₂ <T _{2 open} And T is within T1 ₂ Always greater than T _{2-pass valve} 。

5. The refrigeration unit of claim 2, further comprising a controller for,

if the high-temperature-stage compressor and the low-temperature-stage compressor are both in an operating state, timing the operating time of the low-temperature-stage compressor;

within a preset time T2, if T ₂ Down to its preset shutdown temperature T _{2-pass valve} Controlling the low-temperature-stage compressor to stop and judging T ₁ Whether a third preset condition is met;

if not, controlling the high-temperature-stage compressor to stop;

wherein, the third preset condition is: at time T ₁ ≥T _{1 open} Or, at this time, the preset shutdown temperature T of the first storage compartment _{1 switch} <T ₁ <T _{1 open} And before this moment T ₁ Always greater than T _{1 switch} 。

6. The refrigeration unit of claim 2, further comprising a controller for,

if the high-temperature-stage compressor and the low-temperature-stage compressor are both in an operating state, timing the operating time of the low-temperature-stage compressor;

after a preset time T2, if T ₂ The temperature T is not reduced to the preset shutdown temperature T of the second storage compartment _{2-pass valve} Or below, the run time of the low temperature stage compressor is re-timed.

7. A control method of a refrigeration apparatus according to claim 2, wherein the control method includes,

if the high-temperature-stage compressor is in an operating state and the low-temperature-stage compressor is in a stop state, timing the operating time of the high-temperature-stage compressor;

within a preset time T1, if T ₁ Down to its preset shutdown temperature T _{1 switch} Then judge T ₂ Whether a first preset condition is met;

if yes, controlling the low-temperature-stage compressor to start;

if not, controlling the high-temperature-stage compressor to stop;

wherein, the first preset condition is: at time T ₂ ≥T _{2 open} Or, at this time, the preset shutdown temperature T of the second storage compartment _{2-pass valve} <T ₂ <T _{2 open} And before this moment T ₂ Always greater than T _{2-pass valve} 。

8. A control method of a refrigeration apparatus according to claim 7, wherein said control method further comprises,

if the high-temperature-stage compressor is in an operating state and the low-temperature-stage compressor is in a stop state, timing the operating time of the high-temperature-stage compressor;

after a preset time T1, if T ₁ Is not yet reducedA preset shutdown temperature T to the first storage compartment _{1 switch} Or below, then determine T ₂ Whether a second preset condition is met;

if yes, controlling the low-temperature-stage compressor to start;

if not, the running time of the high-temperature-stage compressor is reckoned;

the second preset condition is: at time T ₂ ≥T _{2 open} Alternatively, the time T _{2-pass valve} <T ₂ <T _{2 open} And T is within T1 ₂ Always greater than T _{2-pass valve} 。

9. A control method of a refrigeration apparatus according to claim 7, wherein said control method further comprises,

if the high-temperature-stage compressor and the low-temperature-stage compressor are both in an operating state, timing the operating time of the low-temperature-stage compressor;

within a preset time T2, if T ₂ Down to its preset shutdown temperature T _{2-pass valve} Controlling the low-temperature-stage compressor to stop and judging T ₁ Whether a third preset condition is met;

if not, controlling the high-temperature-stage compressor to stop;

wherein, the third preset condition is: at time T ₁ ≥T _{1 open} Or, at this time, the preset shutdown temperature T of the first storage compartment _{1 switch} <T ₁ <T _{1 open} And before this moment T ₁ Always greater than T _{1 switch} 。

10. A control method of a refrigeration apparatus according to claim 7, wherein said control method further comprises,

if the high-temperature-stage compressor and the low-temperature-stage compressor are both in an operating state, timing the operating time of the low-temperature-stage compressor;

after a preset time T2, if T ₂ The temperature T is not reduced to the preset shutdown temperature T of the second storage compartment _{2-pass valve} Or below, re-operating the low temperature stageThe run time of the compressor is timed.