CN117053457A

CN117053457A - Refrigerating and freezing device and circulating refrigerating system thereof

Info

Publication number: CN117053457A
Application number: CN202210487809.6A
Authority: CN
Inventors: 苏广义; 张欢; 姜明亮
Original assignee: Qingdao Haier Refrigerator Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Refrigerator Co Ltd; Haier Smart Home Co Ltd
Priority date: 2022-05-06
Filing date: 2022-05-06
Publication date: 2023-11-14

Abstract

The invention provides a refrigeration and freezing device and a circulating refrigeration system thereof, wherein the circulating refrigeration system comprises a compressor, a condenser and a freezing evaporator which are connected in series in a refrigerant circulating loop; the circulating refrigeration system further comprises a refrigeration evaporator and a first capillary tube, wherein the refrigeration evaporator is connected between the refrigerant outlet of the condenser and the refrigerant inlet of the freezing evaporator, and the first capillary tube is connected between the refrigerant outlet of the refrigeration evaporator and the refrigerant inlet of the freezing evaporator so as to reduce the pressure of the refrigerant flowing from the refrigeration evaporator to the freezing evaporator. The first capillary tube of the circulating refrigeration system is connected between the refrigerant outlet of the refrigeration evaporator and the refrigerant inlet of the refrigeration evaporator, and can re-throttle and reduce the pressure of the refrigerant with higher evaporator temperature in the refrigeration evaporator, so that the evaporation temperature of the refrigerant reaches the evaporation temperature of the refrigeration chamber, the heat load of the refrigeration chamber is prevented from entering the refrigeration chamber, and the power consumption of the refrigeration and refrigeration device is reduced.

Description

Refrigerating and freezing device and circulating refrigerating system thereof

Technical Field

The invention relates to the field of refrigeration and freezing, in particular to a refrigeration and freezing device and a circulating refrigeration system thereof.

Background

For a dual-system cyclic refrigeration system, the refrigeration evaporator may also be configured to be connected between the refrigerant outlet of the condenser and the refrigerant inlet of the refrigeration evaporator in order to make full use of the refrigeration capacity of the refrigerant in the refrigeration evaporator. That is, when the refrigerating chamber is refrigerating, the refrigerant flowing out of the outlet of the compressor flows through the condenser, the refrigerating capillary tube, the refrigerating evaporator and the freezing evaporator in this order, and finally returns to the compressor again, forming a refrigerant circulation loop.

The refrigerating capillary tube has thick inner diameter and large flow, the evaporating temperature of the refrigerating evaporator is high, the refrigerant heats up after the heat exchange of the refrigerating chamber, and the temperature of the refrigerating evaporator rises when the hot refrigerant flows into the freezing chamber, which is equivalent to increasing the heat load of the freezing chamber, and the power consumption of the refrigerator is increased.

Disclosure of Invention

It is an object of the present invention to overcome at least one of the drawbacks of the prior art and to provide a refrigeration chiller and a circulating refrigeration system therefor.

A further object of the present invention is to prevent the heat load of the refrigerating compartment from entering the freezing compartment, thereby reducing the power consumption of the refrigerator.

In particular, the present invention provides a circulating refrigeration system for a refrigeration chiller, the circulating refrigeration system comprising a compressor, a condenser and a refrigeration evaporator in series in a refrigerant circulation loop; wherein, the circulation refrigerating system still includes: a refrigeration evaporator connected between the refrigerant outlet of the condenser and the refrigerant inlet of the refrigeration evaporator; and a first capillary tube connected between the refrigerant outlet of the refrigeration evaporator and the refrigerant inlet of the freezing evaporator to reduce the pressure of the refrigerant flowing from the refrigeration evaporator to the freezing evaporator.

Optionally, the circulating refrigeration system further comprises: a second capillary tube connected between the refrigerant outlet of the condenser and the refrigerant inlet of the refrigeration evaporator; the third capillary tube is connected in parallel with the second capillary tube and is connected between the refrigerant outlet of the condenser and the refrigerant inlet of the refrigeration evaporator; and the inner diameter of the third capillary is set smaller than the inner diameter of the second capillary.

Optionally, the circulating refrigeration system further comprises: the first solenoid valve has an inlet and two outlets, the inlet of the first solenoid valve is connected with the refrigerant outlet of the condenser, the outlet of one first solenoid valve is connected with the second capillary tube, the outlet of the other first solenoid valve is connected with the third capillary tube, and the first solenoid valve is configured to selectively enable the refrigerant to flow to the refrigeration evaporator through the second capillary tube or the third capillary tube.

Optionally, the refrigeration evaporator includes a heat exchange tube having a first inlet and a second inlet, the refrigeration evaporator being configured such that refrigerant entering from the first inlet flows through all of the heat exchange tube and refrigerant entering from the second inlet flows through part of the heat exchange tube; and the circulating refrigeration system is configured to selectively pass refrigerant into the heat exchange tubes from either the first inlet or the second inlet.

Optionally, the circulating refrigeration system further comprises: a fourth capillary tube connected between the refrigerant outlet of the condenser and the first inlet; and a fifth capillary tube connected in parallel with the fourth capillary tube and connected between the refrigerant outlet and the second inlet of the condenser.

Optionally, the fourth capillary is equal in length and the same in inner diameter as the fifth capillary.

Optionally, the circulating refrigeration system further comprises: and the second electromagnetic valve is provided with an inlet and two outlets, the inlet of the second electromagnetic valve is connected with the refrigerant outlet of the condenser, the outlet of one second electromagnetic valve is connected with the fourth capillary tube, and the outlet of the other second electromagnetic valve is connected with the fifth capillary tube.

Optionally, the circulating refrigeration system further comprises: and the first spray pipe is connected between the outlet of the fourth capillary tube and the first inlet so as to improve the flow rate of the refrigerant entering the heat exchange tube from the first inlet.

Optionally, the circulating refrigeration system further comprises: and the second spray pipe is connected between the outlet of the fifth capillary tube and the second inlet so as to improve the flow rate of the refrigerant entering the heat exchange tube from the second inlet.

In particular, the present invention provides a refrigeration and freezer comprising: a cabinet having a refrigerating chamber and a freezing chamber; and a circulation refrigeration system according to any one of the preceding claims, wherein the refrigeration evaporator is for providing refrigeration to the refrigeration compartment and the freezer evaporator is for providing refrigeration to the freezer compartment.

According to the circulating refrigeration system, the first capillary tube is connected between the refrigerant outlet of the refrigeration evaporator and the refrigerant inlet of the refrigeration evaporator, and can be used for re-throttling and reducing the pressure of the refrigerant with higher evaporator temperature in the refrigeration evaporator, so that the evaporation temperature of the refrigerant reaches the evaporation temperature of the freezing chamber, the heat load of the refrigeration chamber is prevented from entering the freezing chamber, and the power consumption of the refrigerator is reduced.

Further, in the circulating refrigeration system of the invention, the second capillary tube is connected between the refrigerant outlet of the condenser and the refrigerant inlet of the refrigeration evaporator, the third capillary tube is connected in parallel with the second capillary tube, and the third capillary tube is connected between the refrigerant outlet of the condenser and the refrigerant inlet of the refrigeration evaporator, and the inner diameter of the third capillary tube is set smaller than that of the second capillary tube, so that when the refrigerant discharged from the condenser enters different capillary tubes, the pressure drop amplitude is different, and the pressure of the refrigerant entering the refrigeration evaporator is further different, so that different refrigerant flow paths can be switched in different scenes to save energy consumption.

Further, in the circulation refrigeration system of the present invention, the freezing evaporator is configured such that the refrigerant entering from the first inlet flows through all of the heat exchange tubes, and the refrigerant entering from the second inlet flows through part of the heat exchange tubes. Therefore, the refrigerant entering from the first inlet flows through all the heat exchange tubes, so that the heat exchange tubes of the whole freezing evaporator have a heat exchange function, and the freezing chamber can be cooled rapidly. The refrigerant entering from the second inlet flows through all the heat exchange tubes, so that the heat exchange tubes of part of the freezing evaporator have the heat exchange function, the freezing chamber can be cooled slowly, the normal refrigeration requirement of the freezing chamber is maintained, and the power consumption of the refrigerator is reduced.

The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG. 1 is a schematic perspective view of a refrigerated freezer according to one embodiment of the invention;

fig. 2 is a schematic view of a circulation refrigeration system in a refrigeration chiller according to a first embodiment of the present invention;

FIG. 3 is a schematic view of a circulating refrigeration system in a refrigeration and freezer according to a second embodiment of the invention;

fig. 4 is a schematic view of a circulation refrigeration system in a refrigeration chiller according to a third embodiment of the present invention;

fig. 5 is a schematic view of a freezing evaporator in a refrigeration and freezing apparatus according to one embodiment of the present invention.

Detailed Description

In the description of the present embodiment, it is to be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "depth", and the like indicate orientations or positional relationships as references based on orientations in a normal use state, and can be determined with reference to the orientations or positional relationships shown in the drawings, for example, "front" indicating an orientation refers to a side toward a user. This is merely to facilitate describing the invention and to simplify the description and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention.

The present invention provides a refrigerating and freezing device 1. The refrigeration and freezing device 1 can be a refrigerator, a freezer, an ice bar and the like so as to provide a refrigerated and frozen storage environment for users.

Referring to fig. 1, fig. 1 is a schematic perspective view of a refrigerating and freezing apparatus 1 according to an embodiment of the present invention. The refrigeration and freezer 1 may generally include a cabinet 10 and a door 20.

The case 10 may include a housing located at the outermost side of the overall refrigerator-freezer 1 to protect the overall refrigerator-freezer 1, and a plurality of inner liners. The plurality of inner containers are wrapped by the shell, and heat insulation materials (forming a foaming layer) are filled in the space between the plurality of inner containers and the shell so as to reduce the outward heat dissipation of the inner containers. Each liner may define a forwardly open storage space, and the storage spaces may be configured as a refrigerator compartment 12, freezer compartment 14, temperature swing compartment, etc., with the specific number and function of storage spaces being configurable according to pre-determined requirements.

The number of the door bodies 20 can be the same as that of the inner containers, namely, the storage compartments with the front open of each inner container can be opened and closed by the corresponding door bodies 20. The door 20 is movably provided in front of the case 10, for example, the door 20 may be provided at one side of the front of the case 10 in a hinged manner, and the storage space may be opened and closed in a pivotal manner.

Referring to fig. 2, fig. 2 is a schematic view of a circulation refrigeration system 30 in the refrigeration and freezer 1 according to the first embodiment of the present invention. In some embodiments, the refrigeration and freezer 1 can also include a circulating refrigeration system 30 for providing refrigeration to the storage compartments. The circulation refrigeration system 30 may also include a compressor 31, a condenser 32, a dew point removal tube 33, a filter 34, a throttle device 36, and an evaporator.

The compressor 31 is provided in the compressor compartment of the case 10 and serves as a power of a refrigerating system, which increases the pressure and temperature of the refrigerant vapor by compression, creating a condition for transferring heat of the refrigerant vapor to an external environment medium, i.e., compressing the low-temperature low-pressure refrigerant vapor to a high-temperature high-pressure state, so that the refrigerant vapor can be condensed using normal-temperature air or water as a cooling medium.

The condenser 32 is disposed in the press cabin and is disposed at one side of the compressor 31 at intervals in the lateral direction of the case 10. The condenser 32 is a heat exchange device that takes heat from the high-temperature and high-pressure refrigerant vapor from the compressor 31 by using the environment, and cools and condenses the high-temperature and high-pressure refrigerant vapor into a refrigerant liquid at a high pressure and a normal temperature. Further, in order to facilitate heat dissipation of the condenser 32, a condensing fan 36 may be further provided at the condenser 32.

The dew removing tube 33 is connected to the outlet of the condenser 32, and since the refrigerant at the outlet of the condenser 32 is at a normal temperature and the temperature of the refrigerant is high with respect to the storage compartment, the refrigerant can heat the surrounding members when passing through the dew removing tube 33, and frost formation is avoided. Specifically, the dew removing tube 33 may be provided at a position where the box 10 needs to be heated for dew removal, for example, in a center sill of the refrigerating and freezing apparatus 1 or the like.

The filter 34 is connected in series in the circulation loop of the refrigerant, and is used for filtering impurities in the refrigerant, so as to avoid blocking the circulation loop of the refrigerant and affecting the refrigeration efficiency of the circulation refrigeration system 30.

A throttling device 36 (which may be a capillary tube) may be connected in series with the outlet of the condenser 32 to reduce the pressure and temperature of the refrigerant liquid to change the refrigerant liquid discharged from the condenser 32 at a high pressure and a normal temperature into a low temperature and low pressure refrigerant to be discharged into the evaporator for phase change heat absorption.

An evaporator may be provided in the cabinet 10 to directly or indirectly supply cold to the storage compartment of the refrigerator-freezer 1. For example, in the compression type direct-cooling refrigerating and freezing apparatus 1, the evaporator may be provided outside or inside the rear wall surface of the liner. In the compression type air-cooled refrigeration and freezing device 1, an evaporator chamber is further arranged in the box body 10, the evaporator chamber is communicated with the storage compartment through an air path system, an evaporator is arranged in the evaporator chamber, and a fan is arranged at an outlet of the evaporator chamber so as to circularly refrigerate the storage compartment.

Referring to fig. 2, in some embodiments, the number of evaporators may also be set to two, the freezing evaporator 41 and the refrigerating evaporator 42, respectively. A freezing evaporator 41 may be disposed at a rear side of the freezing chamber 14 to provide cooling capacity for the freezing chamber 14, and a refrigerating evaporator 42 may be disposed at a rear side of the refrigerating chamber 12 to provide cooling capacity for the refrigerating chamber 12. When the refrigerating and freezing apparatus 1 has a temperature changing chamber other than the refrigerating chamber 12 and the freezing chamber 14, the temperature changing chamber may be provided with cooling capacity by either one of the freezing evaporator 41 and the refrigerating evaporator 42, which may be set according to actual circumstances.

Further, in order to make full use of the cold of the refrigerant in the refrigeration evaporator 42, the refrigeration evaporator 42 may also be provided to be connected between the refrigerant outlet of the condenser 32 and the refrigerant inlet of the refrigeration evaporator 41. That is, when the refrigerating chamber 12 is cooled, the refrigerant flowing out from the outlet of the compressor 31 flows through the condenser 32, the refrigerating capillary tube, the refrigerating evaporator 42 and the freezing evaporator 41 in this order, and finally returns to the compressor 31 again, forming a refrigerant circulation circuit.

In some embodiments, the circulation refrigeration system 30 may further include a first capillary tube 43, the first capillary tube 43 being connected between the refrigerant outlet of the refrigeration evaporator 42 and the refrigerant inlet of the refrigeration evaporator 41 to reduce the pressure of the refrigerant flowing from the refrigeration evaporator 42 to the refrigeration evaporator 41.

That is, when the refrigerating chamber 12 is cooled, the refrigerant flowing out from the outlet of the compressor 31 flows through the condenser 32, the refrigerating capillary tube, the refrigerating evaporator 42, the first capillary tube 43 and the freezing evaporator 41 in this order, and finally returns to the compressor 31 again, forming a refrigerant circulation circuit.

Since the throttle device 36 for throttling the flow into the refrigeration evaporator 42 has a large inner diameter and a large flow rate, the refrigeration evaporator 42 has a high evaporation temperature, the refrigerant heats up after heat exchange in the refrigerating chamber 12, and the temperature of the refrigeration evaporator 41 increases when the hot refrigerant flows into the freezing chamber 14, which corresponds to an increase in the heat load of the freezing chamber 14, and the power consumption of the refrigeration-freezing apparatus 1 increases. Therefore, in the present embodiment, the first capillary tube 43 can re-throttle and reduce the pressure of the refrigerant with higher evaporator temperature in the refrigeration evaporator 42, so that the evaporating temperature of the refrigerant reaches the evaporating temperature of the freezing chamber 14, and the heat load of the refrigeration chamber 12 is prevented from entering the freezing chamber 14, thereby reducing the power consumption of the refrigeration and freezing device 1.

Referring to fig. 3, fig. 3 is a schematic view of a circulation refrigeration system 30 in a refrigeration chiller 1 according to a second embodiment of the present invention. Further, in the circulation refrigeration system 30, the throttling device 36 for throttling the flow into the refrigeration evaporator 42 may further include a second capillary tube 51 and a third capillary tube 52.

The second capillary tube 51 is connected between the refrigerant outlet of the condenser 32 and the refrigerant inlet of the refrigerated evaporator 42. The third capillary tube 52 is connected in parallel with the second capillary tube 51, the third capillary tube 52 being connected between the refrigerant outlet of the condenser 32 and the refrigerant inlet of the refrigerated evaporator 42. The second and third capillary tubes 51 and 52 may pressure drop the refrigerant from the condenser 32 such that the high-pressure normal-temperature refrigerant liquid at the outlet of the condenser 32 becomes low-temperature low-pressure refrigerant, thereby creating a phase-change heat absorption condition for the refrigerant discharged into the refrigeration evaporator 42.

Further, the inner diameter of the third capillary tube 52 is set smaller than that of the second capillary tube 51, so that the pressure drop amplitude is different when the refrigerant discharged from the condenser 32 enters different capillary tubes, and the pressure of the refrigerant entering the refrigeration evaporator 42 is different, so that different refrigerant flow paths can be switched in different scenes to save energy consumption.

For example, when the ambient temperature is high or the user frequently opens the door body 20, the refrigerant flows to the second capillary tube 51 having a slightly thicker inner diameter, and at this time, the rotation speed of the compressor 31 is appropriately increased, so that the flow rate of the refrigerant is increased, thereby achieving the purpose of rapid cooling. After the temperature of the refrigerating chamber 12 is stabilized, the rotation speed of the compressor 31 is reduced, and the refrigerant flows through the thinner third capillary tube 52, so that the refrigerating requirement of the refrigerating chamber 12 is met, the rapid cooling is ensured, and the energy consumption is saved.

Further, switching the flow of the refrigerant through the second capillary tube 51 or the third capillary tube 52 may be achieved by the first solenoid valve 53. Specifically, the first solenoid valve 53 has one inlet and two outlets, the inlet of the first solenoid valve 53 is connected to the refrigerant outlet of the condenser 32, the outlet of one of the first solenoid valves 53 is connected to the second capillary tube 51, and the outlet of the other first solenoid valve 53 is connected to the third capillary tube 52, so that the valve body of the first solenoid valve 53 can be controlled to flow the refrigerant to the refrigeration evaporator 42 through the second capillary tube 51 or the third capillary tube 52.

Referring to fig. 4 and 5, in some embodiments, the freeze evaporator 41 includes heat exchange tubes 410, the heat exchange tubes 410 having a first inlet 412 and a second inlet 413, the freeze evaporator 41 being configured such that refrigerant entering from the first inlet 412 flows through all of the heat exchange tubes 410, and refrigerant entering from the second inlet 413 flows through part of the heat exchange tubes 410. The circulating refrigeration system 30 is configured to selectively pass refrigerant into the heat exchange tubes 410 from either the first inlet 412 or the second inlet 413.

In the present embodiment, the refrigerant entering from the first inlet 412 flows through all the heat exchange tubes 410, so that the heat exchange tubes 410 of the whole freezing evaporator 41 have a heat exchange function, and thus the freezing chamber 14 can be cooled rapidly. The refrigerant entering from the second inlet 413 flows through all the heat exchange tubes 410, so that the heat exchange tubes 410 of the partial freezing evaporator 41 have a heat exchange function, and thus the freezing chamber 14 can be cooled more slowly, so as to maintain the normal refrigeration requirement of the freezing chamber 14.

For example, when the temperature in the freezing chamber 14 is high or the user frequently opens the door 20, the freezing evaporator 41 is required to rapidly cool, and the refrigerant may enter the heat exchange tube 410 through the first inlet 412, so that the entire freezing evaporator 41 is cooled. When the temperature in the freezing chamber 14 is stable, the refrigerant can enter the heat exchange tube 410 from the second inlet 413, part of the freezing evaporator 41 is used for refrigerating, the flowing resistance of the refrigerant is reduced, the power of the compressor 31 is reduced, and the power consumption of the refrigeration and freezing device 1 is reduced.

Further, the circulation refrigeration system 30 may further include a fourth capillary tube 61 and a fifth capillary tube 62. The fourth capillary tube 61 is connected between the refrigerant outlet of the condenser 32 and the first inlet 412. The fifth capillary tube 62 is connected in parallel with the capillary tube between the refrigerant outlet of the condenser 32 and the second inlet 413.

Similarly, the fourth capillary tube 61 and the fifth capillary tube 62 may perform pressure drop on the refrigerant from the condenser 32, so that the refrigerant liquid at high pressure and normal temperature at the outlet of the condenser 32 is changed into the refrigerant at low temperature and low pressure, thereby creating a condition of phase change heat absorption for the refrigerant discharged into the freezing evaporator 41.

In some specific embodiments, the fourth capillary 61 is the same length and the same inside diameter as the fifth capillary 62. This ensures that the pressure and temperature of the refrigerant throttled by the fourth capillary tube 61 or the fifth capillary tube 62 are the same, that is, the fourth capillary tube 61 or the fifth capillary tube 62 does not distinguish the pressure of the refrigerant from the condenser 32, which ensures smooth flow of the refrigerant into the freeze evaporator 41, reduces noise, and avoids system vibration caused in switching the flow path of the fourth capillary tube 61 or the fifth capillary tube 62.

Further, switching the flow of refrigerant through the fourth capillary tube 61 and the fifth capillary tube 62 may be achieved by the second solenoid valve 63. Specifically, the second solenoid valve 63 has one inlet and two outlets, the inlet of the second solenoid valve 63 is connected to the refrigerant outlet of the condenser 32, the outlet of one of the second solenoid valves 63 is connected to the fourth capillary tube 61, and the outlet of the other second solenoid valve 63 is connected to the fifth capillary tube 62, so that the valve body of the second solenoid valve 63 can be controlled to control the refrigerant to pass through the fourth capillary tube 61 and the fifth capillary tube 62, thereby controlling the refrigerant to enter the freeze evaporator 41 from the first inlet 412 or the second inlet 413.

In some embodiments, the circulation refrigeration system 30 may further include a first nozzle 71 and a second nozzle 72. The first nozzle 71 is connected between the outlet of the fourth capillary tube 61 and the first inlet 412 to increase the flow rate of the refrigerant entering the heat exchange tube 410 from the first inlet 412. The second nozzle 72 is connected between the outlet of the fifth capillary tube 62 and the second inlet 413 to increase the flow rate of the refrigerant entering the heat exchange tube 410 from the second inlet 413.

A nozzle refers to a device that increases the flow rate of a fluid by changing the geometry of the inner wall of a pipe segment. The first nozzle 71 and the second nozzle 72 are respectively disposed at the first inlet 412 and the second inlet 413, so that the refrigerant entering the first inlet 412 and the second inlet 413 can obtain a larger flow, and the heat exchange efficiency of the freezing evaporator 41 is improved.

By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described herein in detail, many other variations or modifications of the invention consistent with the principles of the invention may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A circulating refrigeration system for a refrigeration chiller, the circulating refrigeration system comprising a compressor, a condenser, and a refrigeration evaporator in series in a refrigerant circulation loop; wherein, the circulation refrigerating system further includes:

a refrigeration evaporator connected between the refrigerant outlet of the condenser and the refrigerant inlet of the refrigeration evaporator; and

and a first capillary tube connected between the refrigerant outlet of the refrigeration evaporator and the refrigerant inlet of the freezing evaporator to reduce the pressure of the refrigerant flowing from the refrigeration evaporator to the freezing evaporator.

2. The circulation refrigeration system of claim 1, further comprising:

a second capillary tube connected between the refrigerant outlet of the condenser and the refrigerant inlet of the refrigeration evaporator;

a third capillary tube connected in parallel with the second capillary tube and connected between the refrigerant outlet of the condenser and the refrigerant inlet of the refrigeration evaporator; and is also provided with

The inner diameter of the third capillary is set smaller than the inner diameter of the second capillary.

3. The circulation refrigeration system of claim 2, further comprising:

a first solenoid valve having an inlet and two outlets, the inlet of the first solenoid valve being connected to the refrigerant outlet of the condenser, one of the outlets of the first solenoid valve being connected to the second capillary tube and the other of the outlets of the first solenoid valve being connected to the third capillary tube, configured to selectively flow refrigerant through either the second capillary tube or the third capillary tube to the refrigerated evaporator.

4. The refrigeration cycle of claim 1, wherein,

the freeze evaporator comprises heat exchange tubes, the heat exchange tubes are provided with a first inlet and a second inlet, the freeze evaporator is configured that the refrigerant entering from the first inlet flows through all the heat exchange tubes, and the refrigerant entering from the second inlet flows through part of the heat exchange tubes; and is also provided with

The circulating refrigeration system is configured to selectively pass refrigerant from the first inlet or the second inlet into the heat exchange tubes.

5. The circulation refrigeration system of claim 4, further comprising:

a fourth capillary tube connected between the refrigerant outlet of the condenser and the first inlet;

and a fifth capillary tube connected in parallel with the fourth capillary tube and connected between the refrigerant outlet of the condenser and the second inlet.

6. The refrigeration cycle of claim 5, wherein,

the length of the fourth capillary tube is equal to that of the fifth capillary tube, and the inner diameters of the fourth capillary tube and the fifth capillary tube are the same.

7. The circulation refrigeration system of claim 5, further comprising:

and the second electromagnetic valve is provided with an inlet and two outlets, the inlet of the second electromagnetic valve is connected with the refrigerant outlet of the condenser, one outlet of the second electromagnetic valve is connected with the fourth capillary tube, and the outlet of the other second electromagnetic valve is connected with the fifth capillary tube.

8. The circulation refrigeration system of claim 5, further comprising:

and the first spray pipe is connected between the outlet of the fourth capillary tube and the first inlet so as to improve the flow rate of the refrigerant entering the heat exchange tube from the first inlet.

9. The circulation refrigeration system of claim 5, further comprising:

and the second spray pipe is connected between the outlet of the fifth capillary tube and the second inlet so as to improve the flow rate of the refrigerant entering the heat exchange tube from the second inlet.

10. A refrigerated chiller comprising:

a cabinet having a refrigerating chamber and a freezing chamber; and

the circulation refrigeration system of any one of claims 1 to 9, wherein the refrigeration evaporator is for providing refrigeration to the refrigeration compartment and the freezing evaporator is for providing refrigeration to the freezing compartment.