CN215951881U - Low-temperature refrigeration system and refrigeration equipment - Google Patents

Abstract

The utility model provides a low-temperature refrigeration system and refrigeration equipment. The primary refrigeration loop comprises a primary compressor, a primary condenser, a first primary pressure reduction component and a first primary evaporator which are sequentially communicated in a fluid way from head to tail and enable a refrigerant to sequentially circulate; the secondary refrigeration loop comprises a secondary compressor, a secondary condenser, a secondary pressure reduction component and a secondary evaporator which are sequentially communicated in a fluid way from head to tail and enable the refrigerant to sequentially circulate; the defrosting branch comprises a defrosting condenser and a defrosting depressurization component, and the outlet of the primary compressor, the defrosting condenser, the defrosting depressurization component and the inlet of the first primary evaporator are sequentially in fluid communication; the defrosting condenser is configured to heat the secondary evaporator; the primary refrigeration loop and the secondary refrigeration loop are configured to enable the refrigerant in the primary refrigeration loop to absorb heat of the refrigerant in the secondary refrigeration loop. The utility model reduces the temperature rise of the low-temperature refrigeration chamber.

Description

Low-temperature refrigeration system and refrigeration equipment

Technical Field

The utility model belongs to the technical field of refrigeration equipment, and particularly provides a low-temperature refrigeration system and refrigeration equipment.

Background

Modern household refrigeration appliances typically include a refrigerator and an ice chest. The lowest refrigeration temperature of a common refrigerator is usually about-18 ℃, and in order to meet the refrigeration requirement of a user at a lower temperature, the existing refrigerator usually adopts a double-refrigeration system for refrigeration. That is, one of the dual refrigerating systems can refrigerate the other system, and the other system can provide a refrigerating effect of a lower temperature to the refrigerator after the refrigerant thereof is cooled. The lowest refrigeration temperature of the existing refrigerator adopting double refrigeration systems can reach below-50 ℃.

The same as common refrigeration equipment, the refrigeration equipment with double refrigeration systems has the frosting phenomenon in the working process of a low-temperature evaporator in the low-temperature system. In order to remove the frost from the low-temperature evaporator, the prior art generally arranges an electric heating device on the low-temperature evaporator, so as to melt the frost from the low-temperature evaporator by the electric heating device. However, since the temperature of the low-temperature condenser is too low, more heat is required for defrosting, and accordingly, a longer heating time is required.

However, heating the low-temperature condenser for a long time will cause more heat transferred to the air in the low-temperature refrigeration chamber by the electric heating device in the long time, and bring a large temperature rise to the low-temperature refrigeration chamber, so that the expansion degree of the high-temperature air in the low-temperature refrigeration chamber is larger, and the high-temperature air is more easily diffused into the storage chamber, thereby affecting the storage effect of the stored objects (such as food materials, medicines, chemical reagents, biological reagents and the like).

SUMMERY OF THE UTILITY MODEL

The utility model provides a low-temperature refrigeration system, which aims to solve the problems in the prior art that the temperature rise of a low-temperature refrigeration chamber is easy to be large when a low-temperature evaporator in refrigeration equipment with a low-temperature refrigeration function is defrosted.

One purpose of the utility model is to convey the heat in the primary refrigeration loop to the secondary evaporator (namely, a low-temperature evaporator) through the defrosting branch, so as to quickly defrost the secondary evaporator and reduce the temperature rise of the low-temperature refrigeration chamber.

To this end, the present invention provides a cryogenic refrigeration system comprising:

the primary refrigeration loop comprises a primary compressor, a primary condenser, a first primary pressure reduction component and a first primary evaporator, wherein the primary compressor, the primary condenser, the first primary pressure reduction component and the first primary evaporator are sequentially communicated in a fluid mode from head to tail and enable a refrigerant to sequentially circulate and flow through;

the secondary refrigeration loop comprises a secondary compressor, a secondary condenser, a secondary pressure reduction component and a secondary evaporator which are sequentially communicated in a fluid way from head to tail and enable the refrigerant to sequentially circulate and flow through;

the defrosting branch comprises a defrosting condenser and a defrosting depressurization component, and the outlet of the primary compressor, the defrosting condenser, the defrosting depressurization component and the inlet of the first primary evaporator are sequentially in fluid communication; the defrosting condenser is configured to be able to heat the secondary evaporator;

wherein the primary refrigeration circuit and the secondary refrigeration circuit are configured such that refrigerant in the primary refrigeration circuit is able to absorb heat from refrigerant in the secondary refrigeration circuit.

Optionally, the defrosting condenser is provided as a pipe, and the pipe is wound around or attached to the secondary evaporator.

Optionally, the defrosting branch further comprises a heating pipe located upstream of the defrosting depressurization member, the heating pipe being used for melting the frost falling from the secondary evaporator.

Optionally, the low-temperature refrigeration system further includes a defrosting control valve, the defrosting branch is communicated with the outlet of the primary compressor through the defrosting control valve, and the defrosting control valve is configured to control whether the refrigerant flowing out of the primary compressor flows to the defrosting branch.

Optionally, the cryogenic refrigeration system further comprises a heat exchanger comprising a first pass and a second pass, the first pass being in series into the primary refrigeration circuit and the first pass being between downstream of the first primary pressure reducing means and upstream of the primary compressor; the second passage is connected in series into the secondary refrigeration circuit and is located between the downstream of the secondary compressor and the upstream of the secondary pressure reducing member, so that the refrigerant in the primary refrigeration circuit absorbs heat of the refrigerant in the secondary refrigeration circuit by means of the heat exchanger.

Optionally, the primary refrigeration circuit further comprises a second primary pressure reducing means and a second primary evaporator connected in parallel with the first primary pressure reducing means, the second primary evaporator and the first primary evaporator being connected in series in sequence.

Optionally, the primary refrigeration circuit further comprises a third primary pressure reducing means and a third primary evaporator connected in parallel with the first primary pressure reducing means, the third primary evaporator and the first primary evaporator being connected in series in sequence.

Optionally, the primary refrigeration circuit further comprises a refrigeration control valve, the first, second, and third primary depressurization members being in fluid communication with the primary condenser through the refrigeration control valve, the refrigeration control valve being configured to control a flow of refrigerant flowing from the primary condenser to the first and/or second and/or third primary depressurization members.

Optionally, the cryogenic refrigeration system is applied to a refrigeration device, the refrigeration device comprises a cryogenic refrigeration chamber,

the second primary evaporator and the secondary evaporator are both arranged in the low-temperature refrigerating chamber.

In addition, the utility model also provides refrigeration equipment comprising the low-temperature refrigeration system in any one of the technical schemes.

Based on the foregoing description, it can be understood by those skilled in the art that, in the foregoing technical solution of the present invention, by configuring the defrosting branch for the low-temperature refrigeration system, the low-temperature refrigeration system can carry heat in the primary refrigeration circuit to the defrosting condenser through the defrosting branch, so that the defrosting condenser heats the secondary evaporator, and removes frost on the secondary evaporator.

It will further be appreciated by those skilled in the art that, without increasing energy consumption, the heat in the primary refrigeration circuit is carried to the defrost condenser and the secondary evaporator is heated, since the defrost branch itself generates little heat; make this defrosting condenser obtain thermal speed and want to be far faster than the speed that electric heater unit obtained heat energy to make this defrosting condenser heat the speed of secondary evaporimeter faster than the speed that electric heater unit heated secondary evaporimeter, and then promoted the speed of defrosting of secondary evaporimeter, reduced the time of defrosting, reduced the temperature rise of low temperature refrigeration room.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly explain the technical solution of the present invention, some embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. Those skilled in the art will appreciate that elements or portions of the same reference number identified in different figures are the same or similar; the drawings of the utility model are not necessarily to scale relative to each other. In the drawings:

FIG. 1 is a schematic diagram of a circuit module of a refrigeration system in accordance with some embodiments of the utility model;

FIG. 2 is a circuit block schematic of the primary refrigeration circuit in some embodiments of the utility model;

FIG. 3 is a schematic illustration of a refrigeration system in accordance with some embodiments of the utility model;

fig. 4 is a schematic cross-sectional view of a second primary evaporator and a secondary evaporator in accordance with other embodiments of the utility model.

Detailed Description

It should be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the present invention, not all of the embodiments of the present invention, and the part of the embodiments are intended to explain the technical principles of the present invention and not to limit the scope of the present invention. All other embodiments, which can be obtained by a person skilled in the art based on the embodiments provided by the present invention without inventive effort, shall still fall within the scope of protection of the present invention.

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Further, it should be noted that the low-temperature refrigeration system of the present invention can be applied to a refrigeration device, and the refrigeration device can be a refrigerator, an ice chest, or a freezer.

Fig. 1 is a simplified schematic diagram of the construction of the refrigeration system of the present invention.

As shown in fig. 1, in some embodiments of the present invention, the cryogenic refrigeration system includes a primary refrigeration circuit 100, a secondary refrigeration circuit 200, and a defrost branch 300. The primary refrigeration circuit 100 and the secondary refrigeration circuit 200 are configured such that the refrigerant in the primary refrigeration circuit 100 can absorb heat from the refrigerant in the secondary refrigeration circuit 200, thereby reducing the temperature of the refrigerant in the secondary refrigeration circuit 200. The defrosting circuit 300 is capable of carrying heat from the primary refrigeration circuit 100 to a secondary evaporator of the secondary refrigeration circuit 200, which is heated to remove frost from the secondary evaporator.

Figure 2 is a simplified schematic of the primary refrigeration circuit of the present invention.

As shown in fig. 2, in some embodiments of the present invention, the primary refrigeration circuit 100 includes a first refrigeration circuit 110, an optional second refrigeration circuit 120, an optional third refrigeration circuit 130, and a refrigeration control valve 150. The refrigeration control valve 150 is configured to control the refrigerant in the primary refrigeration circuit 100 to selectively flow in the first refrigeration circuit 110, the second refrigeration circuit 120, or the third refrigeration circuit 130.

In some embodiments of the present invention, the refrigerant in the primary refrigeration circuit 100 can be controlled by the refrigeration control valve 150 to circulate in only one of the aforementioned circuits, as required by those skilled in the art. That is, the refrigerant is circulated only in the first refrigeration circuit 110, the refrigerant is circulated only in the second refrigeration circuit 120, or the refrigerant is circulated only in the third refrigeration circuit 130.

It can be understood by those skilled in the art that the refrigerant in the primary refrigeration circuit 100 is controlled by the refrigeration control valve 150 to circulate in at least two of the defrost branches of the first refrigeration circuit 110, the second refrigeration circuit 120, and the third refrigeration circuit 130.

In addition, in other embodiments of the present invention, one skilled in the art may omit the provision of the second refrigeration circuit 120 and/or the third refrigeration circuit 130, as desired.

Figure 3 illustrates a portion of the construction of refrigeration systems and refrigeration equipment in some embodiments of the utility model.

As shown in fig. 3, in some embodiments of the present invention, the refrigeration system further includes a defrost control valve 400 and a heat exchanger 500. The defrosting control valve 400 is used to control whether the refrigerant in the primary refrigeration circuit 100 flows to the defrosting branch 300. The heat exchanger 500 is configured to exchange heat between the refrigerant in the primary refrigeration circuit 100 and the refrigerant in the secondary refrigeration circuit 200, so that the primary refrigeration circuit 100 cools the secondary refrigeration circuit 200, and the secondary refrigeration circuit 200 performs low-temperature refrigeration.

With continued reference to fig. 3, the refrigeration apparatus includes a low temperature refrigeration compartment 600 and a drip tray 700. The drip tray 700 is used to receive condensed water and frost water falling from the secondary evaporator 204. In addition, the person skilled in the art may omit the water receiving tray 700, if necessary, to allow the condensed water and the defrosted water to flow to the outside of the refrigeration apparatus, for example, to guide the condensed water and the defrosted water of the refrigeration apparatus to a sewer through a pipeline.

The refrigeration system and the refrigeration apparatus will be described in detail later with reference to fig. 3.

The primary refrigeration circuit 100 from fig. 3 is illustrated.

As shown in fig. 3, the first refrigeration circuit 110 includes a primary compressor 101, a primary condenser 102, a first primary pressure reduction member 1031, and a first primary evaporator 1041 that are sequentially in fluid communication and circulate a refrigerant therethrough. That is, the paths through which the refrigerant circulates in the first refrigeration circuit 110 are: the primary compressor 101 → the primary condenser 102 → the first primary pressure reducing member 1031 → the first primary evaporator 1041 → the primary compressor 101.

The first primary evaporator 1041 may be a freezing evaporator, a temperature-changing evaporator or a refrigerating evaporator of a low-temperature refrigeration system.

With continued reference to fig. 3, the second refrigeration circuit 120 includes a primary compressor 101, a primary condenser 102, a second primary depressurization element 1032, a second primary evaporator 1042, and a first primary evaporator 1041 in sequential fluid communication and circulating a refrigerant therethrough. That is, the paths through which the refrigerant circulates in the second refrigeration circuit 120 are: compressor 101 → primary condenser 102 → second primary pressure reducing member 1032 → second primary evaporator 1042 → first primary evaporator 1041 → primary compressor 101.

Wherein the second primary evaporator 1042 is disposed in the low temperature refrigeration compartment 600 together with the secondary evaporator 202 of the secondary refrigeration circuit 200, and the second primary evaporator 1042 can refrigerate the low temperature refrigeration compartment 600 at least when the temperature of the low temperature refrigeration compartment 600 is high (for example, higher than-10 ℃).

With continued reference to fig. 3, the third refrigeration circuit 130 includes a primary compressor 101, a primary condenser 102, a third primary pressure reducing member 1033, a third primary evaporator 1043, and a first primary evaporator 1041 in serial flow communication and circulating a refrigerant through them in serial flow. That is, the paths through which the refrigerant circulates in the third refrigeration circuit 130 are: primary compressor 101 → primary condenser 102 → third primary pressure reducing member 1033 → third primary evaporator 1043 → first primary evaporator 1041 → primary compressor 101.

The third primary evaporator 1043 may be a freezing evaporator, a temperature-changing evaporator or a refrigerating evaporator of a low-temperature refrigeration system.

With continued reference to fig. 3, the inlet of the refrigeration control valve 150 is in communication with the outlet of the primary condenser 102, and there are at least three outlets of the refrigeration control valve 150 such that three of the outlets are in communication with the inlets of the first, second and third primary pressure reducing members 1031, 1032, 1033, respectively. That is, the refrigeration control valve 150 is used to fluidly communicate the primary condenser 102 with the first, second, and third primary pressure reducing members 1031, 1032, and 1033, respectively, to control the flow of refrigerant flowing out of the primary condenser 102 to one or more of the first, second, and third primary pressure reducing members 1031, 1032, and 1033 via the refrigeration control valve 150. Preferably, the refrigeration control valve 150 is a four-way control valve, or, one skilled in the art may replace the refrigeration control valve 150 with three shut-off valves as needed, and have the first, second and third primary pressure reducing members 1031, 1032, 1033 in fluid communication with the primary condenser 102 outlet through one shut-off valve, respectively.

With continued reference to fig. 3, a filter-drier (not labeled) is also connected in series in the primary refrigeration circuit 100 between the primary condenser 102 and the refrigeration control valve 150; a liquid storage bag (not labeled in the figure) is also connected in series between the outlet of the first primary evaporator 1041 and the inlet of the primary compressor 102; the primary condenser 102, the first primary evaporator 1041, the second primary evaporator 1042, and the third primary evaporator 1043 are also provided with one fan, respectively.

The secondary refrigeration circuit 200 is illustrated with reference to fig. 3.

As shown in fig. 3, the secondary refrigeration circuit 200 includes a secondary compressor 201, a secondary condenser 202, a secondary pressure reducing member 203, and a secondary evaporator 204 in fluid communication and circulating a refrigerant therethrough in sequence. That is, the paths along which the refrigerant circulates in the secondary refrigeration circuit 200 are: secondary compressor 201 → secondary condenser 202 → secondary pressure reducing member 203 → secondary evaporator 204 → secondary compressor 201.

Since the secondary evaporator 204 and the second primary evaporator 1042 are both disposed in the low temperature refrigerating compartment 600, both can use one fan in common. Alternatively, a separate fan may be provided for the secondary evaporator 204 as desired by those skilled in the art.

With continued reference to fig. 3, a desiccant filter is also connected in series between the outlet of the secondary condenser 202 and the inlet of the secondary pressure reducing means 203, and a liquid sump is also connected in series between the outlet of the secondary evaporator 204 and the inlet of the secondary compressor 201.

The defrost branch 300 is illustrated with reference to fig. 3.

With continued reference to fig. 3, the defrost branch 300 includes a defrost condenser 301, a defrost depressurization member 302, and an optional heating tube 303 in sequential fluid communication. As can be seen from fig. 3, the outlet of the primary compressor 101, the heating pipe 303, the defrosting condenser 301, the defrosting pressure reducing member 302, and the inlet of the first primary evaporator 1041 are sequentially in fluid communication, so that the refrigerant sequentially circulates in the order of the primary compressor 101 → the heating pipe 303 → the defrosting condenser 301 → the defrosting pressure reducing member 302 → the first primary evaporator 1041 → the primary compressor 101.

Wherein the defrosting condenser 301 is provided as a pipe line, and the pipe line is wound around the secondary evaporator 204, so that the defrosting condenser 301 can uniformly heat the secondary evaporator 204, thereby uniformly melting the frost on the secondary evaporator 204.

When the defrosting condenser 301 can heat the secondary evaporator 204, a person skilled in the art may attach the defrosting condenser 301 to the secondary evaporator 204 as needed. And optionally the defrost condenser 301 is arranged in a sheet-like structure.

Alternatively, the defrosting condenser 301 and the secondary evaporator 204 may be fixed together by heat conductive fins as needed by those skilled in the art to improve the heat conduction efficiency between the defrosting condenser 301 and the secondary evaporator 204.

Alternatively, it is also possible for those skilled in the art to arrange the defrosting condenser 301 and the secondary evaporator 204 in the low-temperature refrigerating compartment 600 separately from each other as needed, so that the defrosting condenser 301 and the secondary evaporator 204 perform heat transfer by air and heat radiation.

Wherein, at least one part of the heating pipe 303 is placed in the water receiving tray 700 and used for heating condensed water and/or defrosted water in the water receiving tray 700. Alternatively, a person skilled in the art may also dispose the heating pipe 303 between the defrosting condenser 301 and the defrosting pressure reducing member 302, or omit the heating pipe 303, as necessary.

With continued reference to fig. 3, the cryogenic refrigeration system further includes a defrost control valve 400. The defrosting branch 300 is communicated with an outlet of the primary compressor 101 through a defrosting control valve 400, and the defrosting control valve 400 is used for controlling whether the refrigerant flowing out of the primary compressor 101 flows to the defrosting branch 300. Specifically, the inlet of the defrosting control valve 400 is in fluid communication with the outlet of the primary compressor 101, and at least two outlets of the defrosting control valve 400 are provided such that one outlet is in communication with the inlet of the primary condenser 102 and the other outlet is in communication with the inlet of the defrosting condenser 301. That is, the defrosting control valve 400 is used to fluidly communicate the primary condenser 102 and the defrosting condenser 301 with the outlet of the primary compressor 101, respectively, to control the flow of the refrigerant flowing out of the primary compressor 101 to the primary condenser 102 or the defrosting condenser 301 through the defrosting control valve 400. Preferably, the defrosting control valve 400 is a three-way control valve, or, one skilled in the art may replace the defrosting control valve 400 with two shut-off valves as needed, and make the primary condenser 102 and the defrosting condenser 301 fluidly communicate with the outlet of the primary compressor 101 through one shut-off valve, respectively.

The heat exchanger 500 in some embodiments of the utility model is illustrated with reference to fig. 3 and 4.

As shown in fig. 3, the heat exchanger 500 includes a first channel 501 and a second channel 502. Wherein the first passage 501 is connected in series into the primary refrigeration circuit 100 and the first passage 501 is located between downstream of the first primary pressure reducing means 1301 and upstream of the primary compressor 101. Preferably, the first passage 501 is located upstream of the first primary evaporator 1041. A second passage 502 is connected in series into the secondary refrigeration circuit 200, and the second passage 502 is located between the downstream of the secondary compressor 201 and the upstream of the secondary pressure reducing member 203, so that the refrigerant in the primary refrigeration circuit 100 absorbs heat from the refrigerant in the secondary refrigeration circuit 200 by means of the heat exchanger 500.

As shown in fig. 4, the first channel 501 and the second channel 502 are respectively of a tubular structure, and the second channel 502 is sleeved outside the first channel 501, so that the refrigerant in the second channel 502 is fully contacted with the first channel 501, thereby improving the heat transfer efficiency of the refrigerant in the two circuits.

Alternatively, one skilled in the art may also sleeve the first channel 501 outside the second channel 502 as needed.

In addition, in other embodiments of the present invention, a person skilled in the art may also set the first channel 501 and the second channel 502 to be a pipeline structure, and fix the first channel 501 and the second channel 502 together through fins, so that heat is transferred between the refrigerants through the fins.

Alternatively, in other embodiments of the present invention, one skilled in the art may also dispose the heat exchanger 500 as a heat conductive member in contact with the primary and secondary refrigeration circuits 100 and 200, respectively, as desired. Specifically, a refrigerant pipeline between the outlet of the first primary pressure reducing member 1301 and the inlet of the primary compressor 101 is attached to the heat exchanger 500, and a refrigerant pipeline between the outlet of the secondary compressor 201 and the inlet of the secondary pressure reducing member 203 is also attached to the heat exchanger 500, so that the refrigerants in the two refrigerant pipelines exchange heat through the heat exchanger 500.

The defrosting principle of the secondary evaporator 204 in the cryogenic refrigeration system of the present invention will be described in detail with reference to fig. 3.

When the secondary evaporator 204 is defrosted, the defrosting control valve 400 is switched to allow the refrigerant flowing out of the primary compressor 101 to flow only to the defrosting and cooling unit 300, and the defrosting condenser 301 dissipates heat to allow the defrosting condenser 301 to heat the secondary evaporator 204, thereby removing the frost from the secondary evaporator 204.

Based on the foregoing description, it can be understood by those skilled in the art that the present invention enables a low-temperature refrigeration system to carry heat in the primary refrigeration circuit 100 to the defrosting condenser 301 through the defrosting branch 300 by configuring the defrosting branch 300 for the low-temperature refrigeration system, so that the defrosting condenser 301 heats the secondary evaporator 204 to remove frost on the secondary evaporator 204.

Those skilled in the art will further understand that, without increasing energy consumption, since the defrosting branch 300 itself generates little heat, the heat in the primary refrigeration circuit 100 is carried to the defrosting condenser 301 and heats the secondary evaporator 204; the speed of obtaining heat by the defrosting condenser 301 is far faster than the speed of obtaining heat by the electric heating device, so that the speed of heating the secondary evaporator 204 by the defrosting condenser 301 is faster than the speed of heating the secondary evaporator 204 by the electric heating device, the defrosting speed of the secondary evaporator 204 is further improved, the defrosting time is shortened, and the temperature rise of the low-temperature refrigerating chamber 600 is reduced.

Finally, it should be noted that the pressure reducing member according to the present invention may be a member having a throttling function and/or a pressure reducing function, in addition to the capillary tube shown in fig. 3.

So far, the technical solution of the present invention has been described in connection with the foregoing embodiments, but it is easily understood by those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Without departing from the technical principle of the present invention, a person skilled in the art may split and combine the technical solutions in the above embodiments, and may make equivalent changes or substitutions for related technical features, and any changes, equivalents, improvements, etc. made within the technical concept and/or technical principle of the present invention will fall within the protection scope of the present invention.

Claims (10)

1. A cryogenic refrigeration system, comprising:

the primary refrigeration loop comprises a primary compressor, a primary condenser, a first primary pressure reduction component and a first primary evaporator, wherein the primary compressor, the primary condenser, the first primary pressure reduction component and the first primary evaporator are sequentially communicated in a fluid mode from head to tail and enable a refrigerant to sequentially circulate and flow through;

the secondary refrigeration loop comprises a secondary compressor, a secondary condenser, a secondary pressure reduction component and a secondary evaporator which are sequentially communicated in a fluid way from head to tail and enable the refrigerant to sequentially circulate and flow through;

the defrosting branch comprises a defrosting condenser and a defrosting depressurization component, and the outlet of the primary compressor, the defrosting condenser, the defrosting depressurization component and the inlet of the first primary evaporator are sequentially in fluid communication; the defrosting condenser is configured to be able to heat the secondary evaporator;

wherein the primary refrigeration circuit and the secondary refrigeration circuit are configured such that refrigerant in the primary refrigeration circuit is able to absorb heat from refrigerant in the secondary refrigeration circuit.

2. A cryogenic refrigeration system according to claim 1,

the defrosting condenser is arranged as a pipeline which is wound or attached on the secondary evaporator.

3. A cryogenic refrigeration system according to claim 2,

the defrosting branch also comprises a heating pipe, the heating pipe is positioned at the upstream of the defrosting depressurization component, and the heating pipe is used for melting the frost falling from the secondary evaporator.

4. A cryogenic refrigeration system according to claim 3,

the low-temperature refrigeration system further comprises a defrosting control valve, the defrosting branch is communicated with the outlet of the primary compressor through the defrosting control valve, and the defrosting control valve is used for controlling whether the refrigerant flowing out of the primary compressor flows to the defrosting branch or not.

5. A cryogenic refrigeration system according to any one of claims 1 to 4,

the cryogenic refrigeration system further comprises a heat exchanger comprising a first pass and a second pass, the first pass being in series into the primary refrigeration circuit and the first pass being between downstream of the first primary pressure reducing means and upstream of the primary compressor; the second passage is connected in series into the secondary refrigeration circuit and is located between the downstream of the secondary compressor and the upstream of the secondary pressure reducing member, so that the refrigerant in the primary refrigeration circuit absorbs heat of the refrigerant in the secondary refrigeration circuit by means of the heat exchanger.

6. A cryogenic refrigeration system according to any one of claims 1 to 4,

the primary refrigeration circuit further includes a second primary pressure reducing member and a second primary evaporator connected in parallel with the first primary pressure reducing member,

the second primary pressure reducing member, the second primary evaporator and the first primary evaporator are connected in series in this order.

7. A cryogenic refrigeration system according to claim 6,

the primary refrigeration circuit further includes a third primary depressurization member and a third primary evaporator connected in parallel with the first primary depressurization member,

the third primary depressurization member, the third primary evaporator, and the first primary evaporator are connected in series in this order.

8. A cryogenic refrigeration system according to claim 7,

the primary refrigeration circuit further includes a refrigeration control valve,

the first, second, and third primary depressurization members are in fluid communication with the primary condenser via the refrigeration control valve for controlling a flow of refrigerant flowing from the primary condenser to the first and/or second and/or third primary depressurization members.

9. A cryogenic refrigeration system according to claim 8,

the low-temperature refrigeration system is applied to refrigeration equipment, the refrigeration equipment comprises a low-temperature refrigeration chamber,

the second primary evaporator and the secondary evaporator are both arranged in the low-temperature refrigerating chamber.

10. A refrigeration apparatus comprising a cryogenic refrigeration system according to any one of claims 1 to 8.

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