KR20060088039A - Refrigerating apparatus and refrigerator - Google Patents

Abstract

It is an object of the present invention to provide a refrigerator equipped with a refrigerating device and a refrigerating device that can realize high efficiency operation when a compressor having an intermediate pressure portion is applied.

The refrigerating device 30 includes a compressor 1 having an intermediate pressure portion, a radiator 2 connected to the discharge side of the compressor 1, and a pressure reducing means 65, 66 connected to an outlet side of the radiator 2. And heat absorbing means (10, 11) having heat absorbers (57, 58), and an outlet side of the heat absorbing means (10, 11) is connected to a suction portion having a lower pressure than the intermediate pressure portion of the compressor (1). At the same time, the outlet refrigerant pipe of the radiator is branched, one refrigerant pipe is connected to the heat absorbing means, the other refrigerant pipe is connected to the intermediate pressure portion of the compressor 1, and the other refrigerant pipe is connected to the other refrigerant pipe. The pressure reduction mechanism 31 and the heat exchanger 32 are provided, and this heat exchanger 32 is comprised so that heat exchange of the refrigerant | coolant in the said one refrigerant pipe and the refrigerant | coolant in the said other refrigerant pipe is possible.

Compressor, radiator, heat absorbing means, refrigeration unit, pressure reducing mechanism, heat exchanger, pressure reducing means, heat absorber

Description

Refrigerating Units and Refrigerators {REFRIGERATING APPARATUS AND REFRIGERATOR}

1 is a refrigerant circuit diagram showing an embodiment of a refrigeration apparatus of the present invention.

2 is an enthalpy / pressure diagram of a refrigeration cycle in one embodiment of the refrigeration apparatus of the present invention.

Fig. 3 is a schematic configuration diagram showing an application example of a refrigerator to a refrigerator in one embodiment of the present invention.

4 is a refrigerant circuit diagram showing another embodiment of the refrigeration apparatus of the present invention.

5 is a refrigerant circuit diagram showing still another embodiment of the refrigerating device of the present invention.

6 is a refrigerant circuit diagram showing a fourth embodiment of the refrigerating device of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: compressor

2: radiator

6: refrigerant introduction pipe

7, 52, 53: check valve

10: first endothermic means

11: second heat absorbing means

15: fourth heat exchanger

16: fifth heat exchanger

17: first heat exchanger

18: second heat exchanger

19: third heat exchanger

20: heat exchange circuit

21, 41: refrigerator

22, 42: freezer

30, 50, 70, 90: refrigeration unit

31: third expansion valve

32: cooling heat exchanger

40: refrigerator

57, 58: endothermic

63, 64: Fan

65: first expansion valve

66: second expansion valve

91: three-way valve

92: first capillary

93: second capillary

[Document 1] Japanese Unexamined Patent Publication No. 2000-230767

The present invention relates to a refrigerating device having a heat exchanger for cooling a refrigerant from a radiator and a refrigerator having the refrigerating device.

Generally, the refrigeration apparatus which has a refrigeration cycle provided with a compressor, a radiator, a heat absorber, etc. and cools a cooling target in the said heat absorber is known.

As an example of such a refrigerating device, Patent Document 1 discloses a refrigerator that shares a compressor and a condenser, simultaneously connects two heat absorbers in parallel, switches between these heat absorbers, and cools the freezer compartment and the refrigerating compartment independently of each other.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2000-230767

By the way, in this kind of refrigeration apparatus, the compressor which has an intermediate pressure part, for example, the compressor which has a multistage compression mechanism may be applied.

When a compressor having such an intermediate pressure portion is applied to the above-mentioned refrigeration apparatus or refrigerator, a refrigeration apparatus capable of more efficient operation may be realized by establishing a refrigeration cycle suitable for use of the intermediate pressure portion.

Therefore, an object of the present invention is to provide a refrigerating device and a refrigerator provided with the refrigerating device that can realize high efficiency operation when a compressor having an intermediate pressure portion is applied.

The refrigeration apparatus of the present invention includes a compressor having an intermediate pressure portion, a radiator connected to the discharge side of the compressor, and a heat absorbing means connected to an outlet side of the radiator and having a decompression means and a heat absorber, and an outlet side of the heat absorbing means. In the refrigeration apparatus connected to the suction part of lower pressure than the said intermediate | middle pressure part of this compressor, The refrigerant | coolant piping of the exit side of the said radiator is branched, one refrigerant pipe is connected to the said heat absorbing means, and the other refrigerant pipe of the said compressor is While connected to the intermediate pressure section, the other refrigerant pipe is provided with a decompression mechanism and a heat exchanger, and the heat exchanger is configured to heat exchange the refrigerant in the one refrigerant pipe and the refrigerant in the other refrigerant pipe. It is characterized by.

According to a second aspect of the present invention, in the refrigerating device of claim 1, the first refrigerant comprising a refrigerant between the heat absorbing means and a suction part of the compressor is configured to be heat exchanged with a refrigerant in the one refrigerant pipe after leaving the heat exchanger. It is characterized by having a heat exchanger.

The invention according to claim 3 is the refrigerating device according to claim 1 or 2, wherein the heat absorbing means is provided in parallel with the first heat absorbing means including the first pressure reducing means and the first heat absorber, and the first heat absorbing means, And a second heat absorbing means having a second pressure reducing means and a second heat absorbing means, and after the outlet side of the first heat absorbing means and the second heat absorbing means joins, the suction part of the compressor is connected. do.

 In the invention according to claim 4, in the refrigerating device according to claim 3, the refrigerant after exiting the first heat absorber and the refrigerant between the heat exchanger and the first decompression means in the one refrigerant pipe are heat exchanged. And a second heat exchanger for heat-exchanging a refrigerant between the heat exchanger and the second pressure reducing means in the one refrigerant pipe after the first heat exchanger and the second heat absorber. It is done.

According to a fifth aspect of the present invention, there is provided a refrigerator according to claim 3, further comprising: a fourth heat exchanger for exchanging a refrigerant in said one refrigerant pipe after leaving said heat exchanger with a refrigerant after leaving said first heat sink; The one refrigerant pipe after the heat exchanger is connected to the first heat absorbing means and the second heat absorbing means, and the refrigerant in the one refrigerant pipe after leaving the fourth heat exchanger connected to the second heat absorbing means. A fifth heat exchanger for exchanging heat with the refrigerant after exiting the second heat absorber, after exiting the first heat sink and after exiting the fourth heat exchanger, and after exiting the second heat absorber In addition, the refrigerant pipe after leaving the fifth heat exchanger joins, and is connected to the suction part of the compressor.

According to a sixth aspect of the present invention, in the refrigerating device of any one of claims 3 to 5, the first heat absorbing means and the second heat absorbing means selectively function at different temperature zones.

According to a seventh aspect of the present invention, in the refrigerating device of the sixth aspect, the second heat absorbing means functions in a lower temperature zone than the first heat absorbing means.

The refrigerator of this invention was equipped with the refrigeration apparatus in any one of Claims 1-7. It is characterized by the above-mentioned.

In the refrigerator according to claim 9, the refrigerator according to claim 8 includes a refrigerating chamber and a freezing chamber which is operated at a lower temperature than the refrigerating chamber, and the first heat absorbing means cools the refrigerating chamber to the second heat absorbing means. By cooling the freezer compartment.

According to a tenth aspect of the present invention, in the refrigerator according to the ninth aspect, the refrigerant is circulated through the first heat absorbing means and the second heat absorbing means when the refrigerating chamber and / or the freezing chamber are equal to or higher than a predetermined temperature.

The invention according to claim 11 is characterized in that carbon dioxide is used as the refrigerant in the refrigerating device according to any one of claims 1 to 7 and the refrigerator according to any one of claims 8 to 10.

EMBODIMENT OF THE INVENTION Hereinafter, the preferred embodiment of the refrigeration apparatus of this invention and the refrigerator provided with the said refrigeration apparatus is described in detail based on drawing.

(First embodiment)

An embodiment of the present invention will be described in detail with reference to the drawings. 1 shows a refrigerant circuit diagram of a refrigerating device as one embodiment of the present invention. The refrigerating device 30 includes a compressor 1, a radiator 2 connected to the discharge side of the compressor 1, a first heat absorbing means 10 connected to an outlet side of the radiator 2, and The second heat absorbing means 11 provided in parallel with the first heat absorbing means 10 and the heat exchange circuit 20 are provided, and the outlet side of the first heat absorbing means 10 and the second heat absorbing means 11 is a compressor ( On the suction side of 1), the outlet side of the heat exchange circuit 20 is connected to the intermediate pressure portion of the compressor 1 to form a refrigeration cycle.

The first heat absorbing means 10 includes a first expansion valve 65 through which the refrigerant from the branch point 9A flows, and a refrigeration heat absorber 57. As described above, the second heat absorbing means 11 is provided in parallel with the first heat absorbing means 10, the second expansion valve 66 through which the refrigerant from the branch point 9A flows, and the heat absorber for refrigeration. 58 and a check valve 52.

The first heat absorbing means 10 and the second heat absorbing means 11 selectively function at different temperature bands, and the refrigerant pipe from the radiator 2 branches at the branching point 9A, and one end of the first heat absorbing means The means 10 and the other are respectively connected in parallel as the second heat absorbing means 11, and join again at the confluence point 9B preceding the suction port of the compressor 1.

Here, the first expansion valve 65 and the second expansion valve 66 are configured to be able to change the degree of throttling. By changing the degree of throttling, the refrigerant is lowered to a predetermined pressure until it reaches the heat absorbers 57 and 58 so that the evaporation temperature of the coolant in the heat absorbers 57 and 58 can be controlled, By completely closing one of the second expansion valves 65, 66, it is possible to selectively distribute the refrigerant to the first heat absorbing means 10 or the second heat absorbing means 11.

In addition, the refrigerating device 30 of the present embodiment includes a check valve 53 between the confluence point 9B of the first heat absorbing means 10 and the second heat absorbing means 1 and the suction side of the compressor 1. And a third heat exchanger (19) provided to heat exchange the refrigerant from the first and second heat absorbers (57, 58) and the refrigerant in front of the branch point (9A).

In the heat exchange circuit 20, a refrigerant which does not flow to the first and second heat absorbing means 10, 11 flows among the refrigerant branched from the exit side branch point 9C of the radiator 2, and the third Expansion valve (3) and cooling heat exchanger (33). In addition, a refrigerant inlet tube 6 for introducing refrigerant from the cooling heat exchanger 32 into the intermediate pressure portion of the compressor 1 is connected to the outlet side of the cooling heat exchanger 32, and the refrigerant inlet tube 6 ) Is provided with a check valve (7). In addition, the third expansion valve 31 is configured to be able to change the degree of throttling similarly to the first and second expansion valves 65 and 66, and by changing the degree of throttling of the third expansion valve 31, the refrigerant Is lowered to a predetermined pressure until the cooling heat exchanger (32). The refrigerant exiting the third expansion valve 31 is warmed by heat exchange with the refrigerant from the branch point 9C to the first and second endothermic means 10, 11 in the cooling heat exchanger 32, thereby becoming a gas refrigerant. The intermediate pressure portion of the compressor 1 is returned via the refrigerant introduction pipe 6.

The compressor 1 is a two-stage compressor, and includes a first stage compression unit 1A and a two stage compression unit 1B in a sealed container to connect the first stage compression unit 1A and the two stage compression unit 1B. The intermediate cooler 1C is provided on the refrigerant pipe outside the sealed container. In addition, the refrigerant introduction pipe (6) is connected so that the gas refrigerant exiting the cooling heat exchanger (32) can be introduced into the intermediate pressure portion of the compressor (1), that is, between the intermediate cooler (1C) and the two-stage compression portion (1B). In addition, the gas refrigerant leaving the cooling heat exchanger 32 is introduced into the intermediate pressure portion of the compressor 1 as indicated by the broken line arrow by the differential pressure in the refrigerant introduction pipe 6. In addition, this compressor 1 is not limited to a two stage compressor, For example, if it is a 1 stage compressor, the refrigerant | coolant introduction pipe 6 should just be able to return to the intermediate | middle pressure part of a 1 stage compressor. Moreover, the structure which connected several compressor is possible.

And since the 1st and 2nd heat absorbing means 10 and 11 have the structure as mentioned above, for example, when the 2nd expansion valve 66 is closed and the 1st expansion valve 65 is opened, a heat absorber ( 57) side, that is, when the refrigerant flows only to the first heat absorbing means 10, on the contrary, when the first expansion valve 65 is closed and the second expansion valve 66 is opened, the heat absorber 58 side, That is, the refrigerant flows only through the second heat absorbing means 11.

Here, the refrigerant passing through the heat absorber 57 passes through the third heat exchanger 10 after passing through the check valve 53 and exits the cooling heat exchanger 32 from the third heat exchanger 19. After heat exchange with the refrigerant, the suction port of the compressor 1 is returned. In addition, the refrigerant passing through the heat absorber 58 passes through the third heat exchanger 19 after passing through the check valve 52 and exits the cooling heat exchanger 32 from the third heat exchanger 19. After heat exchange with the refrigerant, the suction port of the compressor 1 is returned.

In this embodiment, the cold air passing through the heat absorber 57 is transferred to the refrigerating chamber 21 through the duct 57A, and the cold air passing through the heat absorber 58 is transferred to the freezing chamber 22 through the duct 58A. do.

Here, in the refrigerating device 30 of the present embodiment, a carbon dioxide refrigerant (CO ₂ ), which is a natural refrigerant, is used in consideration of flammability, toxicity, and the like, which have a small environmental load as a refrigerant. For example, mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, PAG (polyalkylene glycol), PEO (polyol ester) and the like are used.

With the above configuration, the operation of the refrigerating device 30 in the present embodiment will be described with reference to FIGS. 1 and 2. 2 is an enthalpy / pressure (ph) diagram of a refrigeration cycle in this embodiment.

First, the refrigeration operation (for example, around -26 degreeC) is demonstrated using the cycle chart shown by the solid line in FIG. This refrigeration operation is a case where the coolant is circulated through the heat absorber 58 side, that is, the second heat absorbing means 11. In the present embodiment, when the compressor 1 is operated, the refrigerant discharged from the compressor 1 is radiated by the radiator 2 and cooled. That is, first, the refrigerant is (1) suction of the first stage compression unit 1A, (2) discharge of the first stage compression unit 1A, (3) suction of the two stage compression unit 1B, and (4) two stage compression It flows in the order of discharge of the part 1B. Thereafter, the refrigerant reaches the branching point 9A from the outlet of the radiator 2 and branches therefrom, partly circulating to the heat exchange circuit 10 and the rest to the second heat absorbing means 11.

The refrigerant circulated from the branch point 9A to the heat exchange circuit 20 side (6) reaches the outlet of the third expansion valve 31 to form a two-phase mixture of gas and liquid. In the state of the two-phase mixture, the refrigerant is warmed by heat exchange with the refrigerant circulating from the branching point 9C to the second heat absorbing means 11 in the cooling heat exchanger 32 to become a gas refrigerant, thereby being intermediate to the compressor 1. It is introduced between the pressure portion, that is, the intermediate cooler 1C and the two stage compression portion 1B. That is, (6) is the outlet of the third expansion valve (65), the inlet of the cooling heat exchanger (32), (21) is the outlet of the cooling heat exchanger (32), and the refrigerant via the The suction of the two-stage compression unit 1B is reached, and it is compressed by the two-stage compression unit 1B.

On the other hand, the refrigerant circulated from the branch point 9A to the second heat absorbing means 11 side is heat-exchanged with the refrigerant circulated to the heat exchange circuit 11 side in the cooling heat exchanger 32 as described above, and then It is cooled again in the third heat exchanger 19 and branches at the branch point 9A to reach the second expansion valve 66. 18 is an outlet of the cooling heat exchanger 32, an inlet of the third heat exchanger 19, 7 an outlet of the third heat exchanger 19, an inlet of the second expansion valve 66, ( 8 is an outlet of the second expansion valve 66, and 22 is an outlet of the heat absorber 58. After the liquid refrigerant entering the heat absorber 58 has evaporated to absorb heat from the surroundings, it is heat exchanged with the refrigerant from the cooling heat exchanger 32 in the third heat exchanger 19, and then the suction of the compressor 1 is performed. To return. That is, 23 is an outlet of the third heat exchanger 19, and 1 is a suction of the first stage compression section 1A.

On the other hand, in the freezing operation (for example, around -5 degreeC), the cycle shown by the broken line in FIG. 2 is formed. This refrigeration operation is a case where the coolant flows to the heat absorber 57 side, that is, the first heat absorbing means 10. Also in this case, when the compressor 1 is operated, the refrigerant discharged from the compressor 1 is radiated by the radiator 2 and cooled. That is, first, the refrigerant is (9) suction of the first stage compression unit 1A, (10) discharge of the first stage compression unit 1A, (11) the outlet of the intermediate cooler 1C, and the two stage compression unit 1B. In the order of suction and discharge of the two-stage compression unit 1B. Thereafter, the refrigerant reaches the branching point 9A from the outlet of the radiator 2 and branches therefrom, partly circulating to the heat exchange circuit 20 and the rest to the first heat absorbing means 10.

The refrigerant circulated from the branch point 9C to the heat exchange circuit 20 side reaches the outlet of the 16th expansion valve 31 (16), and becomes a gas / liquid two-phase mixture. In the state of the two-phase mixture, the refrigerant is warmed by heat exchange with the refrigerant circulating from the branching point 9C to the first heat absorbing means 10 side in the cooling heat exchanger 32 to become a gas refrigerant, thereby being intermediate to the compressor 1. It is introduced between the pressure portion, that is, the intermediate cooler 1C and the two stage compression portion 1B. That is, 16 is an outlet of the third expansion valve 31, an inlet of the cooling heat exchanger 32, 17 is an outlet of the cooling heat exchanger 32, and the refrigerant via the The suction of the two-stage compression unit 1B is reached, and it is compressed by the two-stage compression unit 1B.

On the other hand, the refrigerant circulated from the branch point 9C to the first heat absorbing means 11 side is heat-exchanged with the refrigerant circulated to the heat exchange circuit 20 side as described above in the cooling heat exchanger 32, and then, It is cooled again in the heat exchanger 19 and branches at the branch point 9A to reach the first expansion valve 65. 13 is an outlet of the cooling heat exchanger 32, an inlet of the third heat exchanger 19, 14 an outlet of the third heat exchanger 19, an inlet of the first expansion valve 65, ( 15 is an outlet of the first expansion valve 65 and 24 is an outlet of the heat absorber 57. After the liquid refrigerant entering the heat absorber 57 has evaporated to absorb heat from the surroundings, it is heat exchanged with the refrigerant from the cooling heat exchanger 32 in the third heat exchanger 19, and then the suction of the compressor 1 To return. That is, 25 is the outlet of the third heat exchanger 19, and 9 is the suction of the first stage compression section 1A. In the refrigerating operation, the refrigerant is circulated as described above in both the refrigerating operation and the state is changed to form a refrigerating cycle.

In this embodiment, since the carbon dioxide refrigerant is sealed in the refrigerant circuit, the ambient temperature around the radiator 2, that is, the temperature at the outlet of the radiator 2 (5) in FIG. 2 is +22 as in the present embodiment. Even in the case of degrees Celsius, the refrigerant circuit used for the conventional pron-based or HC-based refrigerant, that is, the refrigerant circuit in which the expansion valves 65 and 66 are provided immediately after the radiator 2, is used as the expansion valves 65 and 66. Since the dryness of the refrigerant flowing in is too high, it is difficult to obtain sufficient cooling performance because the ratio of the gas refrigerant in the refrigerant is high.

Therefore, in the present embodiment, the outlet side refrigerant pipe of the radiator 2 is branched, and the heat exchange circuit 20 is provided at one side thereof, and the first and second cooling heat exchangers 32 of the heat exchange circuit 20 are provided. By supercooling the refrigerant flowing into the second heat absorbing means (10, 11) and cooling again by the third heat exchanger (19), even when a carbon dioxide refrigerant having the above characteristics is used, a high cooling effect is achieved. You can get it. At this time, since the refrigerant on the heat exchange circuit 20 side is introduced into the intermediate pressure portion of the compressor 1 as the gas refrigerant, the compression efficiency in the compressor 1 can also be improved, further improving the efficiency of the refrigeration apparatus 30. Can be improved.

In the freezing operation, it is necessary to further increase the supercooling of the refrigerant flowing into the second heat absorbing means 11, as compared with the refrigeration operation. Since the degree of throttling of the expansion valve 31 can be changed, a supercooling can be obtained in the freezing operation than in the refrigerating operation, and also functions in a lower temperature range than the refrigerating heat absorber 57 in the freezing operation. By using the heat absorber 58, the freezing operation can be performed more efficiently.

As described in detail above, in this embodiment, the heat exchange circuit 20 is provided, and the heat absorber 57 and 58 are selectively used on the basis of the use temperature zone, whereby the refrigerating operation differs in temperature range. And in a refrigeration operation, the heat absorber suitable for the temperature can be used, and the improvement of the operation efficiency of each operation can be expected.

Next, an application example to the refrigerator of the refrigerating device 30 of the present embodiment will be described with reference to FIG.

3 shows a schematic configuration diagram of a refrigerator provided with the refrigerating device 30 of this embodiment. This refrigerator 40 is provided with the refrigerator compartment 41 in the upper end, and the freezer compartment 42 in the lower end. Inner chamber partition walls 61 and 62 are provided inside the chambers 41 and 42, respectively, and inside the ventilation path 44 partitioned by the compartment partition walls 61 and 62, the heat absorber 57 described above. 58, and fans 63 and 64 are installed. In this configuration, the first heat absorbing means 10 and the second heat absorbing means 11 are switched as described above along the thermo on and the thermo off of the refrigerating operation and the freezing operation, so that either of the heat absorbers 57 , 58), and the fans 63 and 64 corresponding thereto are driven. When coolant flows through the heat absorber 57, cold air is supplied to the refrigerating chamber 41, and when coolant flows through the heat absorber 58, cold air is supplied to the freezing chamber 42.

As described above, since the refrigerator 40 of the present embodiment includes the refrigerating device 50 as described above, even when carbon dioxide is used as the refrigerant, high cooling performance and high efficiency operation can be obtained.

In addition, as described in detail, in the refrigerating device 30 of the present embodiment, during the freezing operation, the first expansion valve 65 is closed, the second expansion valve 66 is opened, and the refrigerant is absorbed into the second heat absorbing means 11. In the cold storage operation, the second expansion valve 66 is closed and the first expansion valve 65 is opened to flow the refrigerant to the first heat absorbing means 10. However, the present invention is not limited thereto. In the refrigerator 40, when the refrigerating chamber 41 and the freezing chamber 42 need to be rapidly cooled at room temperature, the so-called pull-down or when the compressor 1 starts operation from the stopped state, at the time of high load, or in the refrigerating chamber ( When the 41 and the freezing chamber 42 are at or above a predetermined temperature, the first endothermic means 10 and the first end valve 65 and the second expansion valve 66 are opened by opening as necessary. The refrigerant is circulated to both sides of the second heat absorbing means (11). , Each chamber (41, 42) may be rapidly cooled within.

(2nd Example)

Next, another embodiment of the present invention will be described with reference to FIG. 4 shows a refrigerant circuit diagram of the refrigerating device 50 in this case. This embodiment differs from the first embodiment in that the first and second heat exchangers 17 and 18 are provided in place of the third heat exchanger 19. That is, in this embodiment, the refrigerant exiting the heat absorbers 57 and 58 is heat exchanged with the refrigerant to be introduced into the first and second expansion valves 65 and 66 before joining at the confluence point 9B. . In addition, it is a matter of course that the refrigerating device 50 of the present embodiment can be applied to a refrigerator similarly to the refrigerating device 30 of the first embodiment.

(Third Embodiment)

Next, another embodiment of the present invention will be described with reference to FIG. 5 shows a refrigerant circuit diagram of the refrigerating device 70 in this case. In the present embodiment, when compared with the first embodiment, the refrigerant having no third heat exchanger 19 and first exiting the cooling heat exchanger 32 is the same as the refrigerant exiting the heat absorber 57 before the branch point 9A. The heat exchange is performed in the fourth heat exchanger 15, and only the refrigerant flowing into the second heat absorbing means 11 is heat exchanged in the fifth heat exchanger 16 with the refrigerant leaving the heat absorber 58. .

Moreover, of course, also in the refrigerating apparatus 70 of this embodiment, it can be applied to a refrigerator similarly to the refrigerating apparatus of each said Example.

(Example 4)

Next, a fourth embodiment of the present invention will be described with reference to FIG. 6 shows a refrigerant circuit diagram of the refrigerating device 90 in this case. In the present embodiment, in comparison with the first embodiment, the three-way valve 91 is provided at the position of the branch point 9A, and at the same time, the third and the third heat absorbing means 10, 11 are replaced with the third and the second heat absorbing means 10, 11; The point provided with 4 heat absorbing means 10B and 11B differs.

The third heat absorbing means 10B includes a first capillary tube 92 and a heat absorber 57, and the fourth heat absorbing means 11B includes a second capillary tube 93 and a heat absorber 58.

The refrigerating device 90 of the present embodiment uses the three-way valve 91 to circulate the refrigerant to the third heat absorbing means 10B or to distribute the refrigerant to the fourth heat absorbing means 11B. Operation is selectable. As mentioned above, in the refrigeration apparatus 90 of this embodiment, since the capillary tubes 92 and 93 are used instead of the expansion valve 65 and 66 in each heat absorbing means, the refrigeration apparatus of this invention can be implement | achieved further at low cost.

Also in the refrigerating devices 50 and 70 of the second and third embodiments, it is possible to apply the third and fourth heat absorbing means 10B and 11B as in the present embodiment, and the refrigerating device of the present embodiment. Also in 90, it is a matter of course that it can be applied to a refrigerator similarly to the refrigerating apparatus of each embodiment.

As mentioned above, although this invention was demonstrated by each Example, this invention is not limited to this, A various change is possible. For example, although the carbon dioxide refrigerant is encapsulated in the refrigerant circuit in each of the above embodiments, the present invention is not limited thereto, and the present invention can also be applied to an encapsulated proton refrigerant or the like.

In addition, the 3rd expansion valve 31 in each said Example and the expansion valves 65 and 66 in the said 1st, 2nd and 3rd Example can be changed into a capillary tube as needed.

According to the present invention, there is provided a refrigerating device capable of high efficiency of operation by including a heat exchange circuit for supercooling a refrigerant leaving a radiator. According to the present invention, there is also provided a refrigerator operable with high efficiency.

Claims (12)

A compressor having an intermediate pressure portion, a radiator connected to the discharge side of the compressor, and a heat absorbing means connected to an outlet side of the radiator, the pressure reducing means and a heat absorber provided, and the outlet side of the heat absorbing means is the intermediate portion of the compressor. In the refrigeration apparatus connected to the suction part of the pressure lower than the pressure part, The refrigerant pipe at the outlet side of the radiator branches, one refrigerant pipe is connected to the heat absorbing means, the other refrigerant pipe is connected to the intermediate pressure portion of the compressor, and the other refrigerant pipe is provided with a decompression mechanism and a heat exchanger. The heat exchanger is configured to be capable of heat exchanging a refrigerant in the one refrigerant pipe and a refrigerant in the other refrigerant pipe. The heat exchanger of claim 1, further comprising a first heat exchanger configured to heat exchange the refrigerant between the heat absorbing means and the suction part of the compressor with the refrigerant in the one refrigerant pipe after leaving the heat exchanger. Refrigeration unit. The heat absorbing means according to claim 1 or 2, wherein the heat absorbing means is provided with a first heat absorbing means including a first pressure reducing means and a first heat absorber, and in parallel with the first heat absorbing means. It is comprised including the 2nd heat absorption means provided, And an outlet side of the first heat absorbing means and the second heat absorbing means joins, and is connected to a suction part of the compressor. 4. The heat exchanger of claim 3, further comprising: a first heat exchanger for heat-exchanging a refrigerant between said first heat exchanger and said refrigerant between said heat exchanger in said one refrigerant pipe and said first pressure reducing means; And a second heat exchanger for heat-exchanging the refrigerant between said heat exchanger in said one refrigerant pipe and said second pressure reducing means in said one refrigerant pipe. 4. The fourth heat exchanger for heat exchanging a refrigerant in said one refrigerant pipe after leaving said heat exchanger with a refrigerant after leaving said first heat absorber, and said one refrigerant after leaving said fourth heat exchanger. A refrigeration apparatus in which a pipe is connected to a first heat absorbing means and a second heat absorbing means, A fifth heat exchanger for heat exchanging a refrigerant in said one refrigerant pipe after leaving said fourth heat exchanger connected to said second heat absorbing means with a refrigerant after leaving said second heat absorber, The refrigerant pipe after the first heat sink and after the fourth heat exchanger and the refrigerant pipe after the second heat absorber and after the fifth heat exchanger have joined, Refrigerating apparatus, characterized in that connected to the suction unit. 4. The refrigerating device according to claim 3, wherein said first heat absorbing means and said second heat absorbing means selectively function at different temperature zones. 7. The refrigerating device according to claim 6, wherein the second heat absorbing means functions in a lower temperature zone than the first heat absorbing means. The refrigerator provided with the refrigeration apparatus of Claim 1 or 2. The refrigerator according to claim 8, further comprising a refrigerating chamber and a freezing chamber which is operated at a lower temperature than the refrigerating chamber. The refrigerator according to claim 1, wherein the refrigerating chamber is cooled by the first heat absorbing means, and the freezing chamber is cooled by the second heat absorbing means. The refrigerator according to claim 9, wherein when the refrigerating compartment and / or the freezing compartment are above a predetermined temperature, the refrigerant is circulated through the first heat absorbing means and the second heat absorbing means. The refrigeration apparatus according to claim 1 or 2, wherein carbon dioxide is used as the refrigerant. The refrigerator according to claim 8, wherein carbon dioxide is used as the refrigerant.

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