JP2001280802A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator to be not increased in a cost and prevent the occurrence of an unbalance of a refrigerant amount and a delay of a refrigerant during switching of operation. SOLUTION: A compressor 1, a condenser 12, a first capillary tube 20, a liquid tank 16, and a three-way valve 17 are interconnected, in the order. An R evaporator 14 is connected to the first outlet of a three-way valve 17. An R evaporator 14 is connected to the first cutlet of the three-way valve 17, and a second capillary tube 21, an F evaporator 15, and a second suction pipe 23 are connected in the order to the outlet of the three-way valve 17. Outlet piping of the R evaporator 14 and the outlet of the second suction pipe 23 are interconnected and connected to the suction port of the compressor 11 through a first suction pipe 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator having an evaporator for a refrigerator and an evaporator for a freezer.

[0002]

2. Description of the Related Art Conventionally, a refrigerating cycle of a refrigerator having an evaporator for a refrigerator (hereinafter referred to as R-eva) and an evaporator for a refrigerator (hereinafter referred to as F-eva) has been proposed.

FIG. 3 shows an example of the refrigeration cycle.
The compressor 111, the condenser 112, the dryer 113, and the three-way valve 117 are sequentially connected, and the first outlet of the three-way valve 117 is connected to the refrigerator compartment capillary tube 128, the Reva 114, and the refrigerator compartment accumulator 126. In addition, three-way valve 1
17 is provided with a capillary tube 1 for the freezer compartment.
29, FEVA 115, accumulator 127 for freezer compartment,
Connect to check valve 118. Then, the pipes from the refrigerating room accumulator 126 and the check valve 118 join together, and then return to the compressor 111 via the suction pipe 130.

In such a refrigeration cycle, a mode for cooling the refrigerator (hereinafter referred to as a refrigeration mode) and a mode for cooling the refrigerator (hereinafter referred to as the refrigeration mode) are alternately performed, so that the R-evacuator 114 and the F-evacuator are operated. It is possible to operate the evaporation temperature of 115 at an optimum temperature for each condition.

However, in this refrigeration cycle, the amount of refrigerant is the same in the refrigeration mode and in the refrigeration mode. For example, if the amount of refrigerant is appropriate for the refrigeration mode, there is a problem that the refrigerant is insufficient in the refrigeration mode.

Further, when the mode is switched from the refrigeration mode to the refrigeration mode, there is a large time difference until the refrigerant flows into the R-eva 114, so that there is a problem that the R-eva 114 cannot be cooled effectively.

[0007]

Therefore, as a solution to the problem of the refrigeration cycle shown in FIG. 3, a refrigeration cycle shown in FIG. 4 has been proposed.

In this refrigerating cycle, a compressor 211, a condenser 212, and a dryer 213 are sequentially connected, and then the piping is branched. Then, one end of the branched pipe is connected to the two-way valve 224 for the refrigerator compartment, the liquid tank 216, the capillary tube 228 for the refrigerator compartment, the R-eva 214, and the accumulator 226 for the refrigerator compartment. Further, the other end of the pipe is connected to the freezing room two-way valve 225, the freezing room capillary tube 229, and the Fever 2.
15. Connect to the freezer accumulator 227 and the check valve 218. Then, the pipes from the refrigerating room accumulator 226 and the check valve 218 merge, and then return to the compressor 211 via the suction pipe 230.

In such a refrigeration cycle, the refrigeration mode and the refrigeration mode are alternately performed, so that the R
It is possible to operate the evaporating temperature of the 04 and the Feva 205 at the optimum temperature for each condition, and it is possible to eliminate the imbalance of the refrigerant amount in the refrigeration mode and the refrigerant delay when switching from the refrigeration mode to the refrigeration mode.

However, in such a refrigeration cycle, two two-way valves 224 and 225 are required, resulting in a problem that the cost is increased.

In view of the above problems, the present invention provides a refrigerator that does not lead to an increase in cost and that can eliminate the imbalance in the amount of refrigerant and the delay of refrigerant at the time of operation switching.

[0012]

According to a first aspect of the present invention, a compressor, a condenser, a first capillary tube, a liquid tank, and a three-way valve are sequentially connected, and a first outlet of the three-way valve is connected to an evaporator for a refrigerator. And a second outlet at the second outlet of the three-way valve.
The capillary tube, the evaporator for the freezer compartment, and the second suction pipe are connected in order, the outlet pipe of the evaporator for the refrigerator compartment is connected to the outlet of the second suction pipe, and the suction of the compressor passes through the first suction pipe. A refrigerator connected to a mouth.

According to a second aspect of the present invention, there is provided the refrigerator according to the first aspect, wherein the first capillary tube and the first suction pipe exchange heat.

The invention according to claim 3 is the refrigerator according to claim 1, wherein heat exchange is performed between the second capillary tube and the second suction pipe.

According to a fourth aspect of the present invention, the liquid tank comprises:
The refrigerator according to claim 1, wherein the three-way valve is provided in a refrigerator compartment.

The invention according to claim 5 is the refrigerator according to claim 1, wherein an accumulator is connected to an inlet of the first suction pipe, and the accumulator is provided in a refrigerator.

The invention according to claim 6 is the refrigerator according to claim 1, wherein a check valve is provided at an outlet of the second suction pipe, and the check valve is provided in the refrigerator compartment.

In the refrigerator according to the first aspect, the amount of refrigerant retained in the liquid tank is larger in the refrigeration mode than in the refrigeration mode, so that the amount of circulated refrigerant in each mode can be optimized. In addition, it is possible to eliminate the refrigerant delay when switching from the freezing mode to the refrigeration mode. In addition, two-way valve
This refrigeration cycle can be realized only by providing one three-way valve without using individual components.

According to the refrigerator of the second aspect, heat loss can be reduced by exchanging heat between the first capillary tube and the first suction pipe.

According to the refrigerator of the third aspect, heat loss can be reduced by exchanging heat between the second capillary tube and the first suction pipe. In addition, if the junction is arranged in the refrigerator compartment, it becomes difficult to freeze.

In the refrigerator according to the fourth aspect of the present invention, since the liquid tank and the three-way valve are provided in the refrigerator compartment, the liquid tank is located near the evaporator and the accumulated liquid refrigerant can be immediately supplied to the evaporator. Refrigerant delay when switching from the freezing mode to the refrigeration mode can be improved.

In the refrigerator according to the fifth aspect, the provision of one accumulator allows the refrigerant to flow through the refrigeration cycle, thereby reducing the cost.

In the refrigerator according to the sixth aspect, in the refrigeration mode, the flow rate of the refrigerant to the freezer evaporator can be prevented, so that the temperature of the freezer can be prevented from rising. Further, by providing the check valve in the refrigerator compartment, the check valve can be used at about 0 ° C., thereby improving reliability.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

(Configuration of Refrigerator 1) FIG. 1 is a longitudinal sectional view of the refrigerator 1 of the present embodiment.

The refrigerator 1 is formed by a heat insulating box 9 and an inner box 8. Then, the heat insulating partition wall 2 divides the refrigerator compartment into a refrigerated temperature space (hereinafter, referred to as R room) 30 and a freezing temperature space (hereinafter, referred to as F room) 40, and the cold air in the R room 30 and the F room 40 is completely independent. The structure is such that cold air does not mix.

The interior of the R room 30 is divided into a refrigerated storage room 4 and a vegetable room 5 by a refrigerated partition plate 3. The interior of the F chamber 40 includes a first freezing chamber 6 and a second freezing chamber 7. And each room has opening-and-closing doors 51-54, respectively.

On the back of the vegetable compartment 5, a refrigerator compartment evaporator (hereinafter, referred to as a evaporator)
An R fan 14 and a refrigerating room cooling fan (hereinafter, R fan) 32 are arranged, and the R fan 32 is arbitrarily operated by a change in the internal temperature and opening and closing of a door. The rear surface of the refrigerated storage room 4 forms a cool air circulation path 10 for supplying cool air into the R room 30.

A freezer evaporator (hereinafter referred to as F-eva) 15
And a freezing room cooling fan (hereinafter, referred to as an F fan) 42 are disposed on the back of the first freezing room 6 and the second freezing room 7, and circulate cool air to cool the first freezing room 6 and the second freezing room 7. Is done.

A machine room 26 is provided at the bottom of the rear surface of the refrigerator 1, and the compressor 11 is arranged in this machine room.

(Configuration of Refrigeration Cycle) Next, the configuration of the refrigeration cycle of the refrigerator 1 will be described with reference to FIG.

Compressor 11, condenser 12, dryer 1
3. First capillary tube 20, liquid tank 1
6. The three-way valve 17 is sequentially connected. The R outlet 14 is connected to a first outlet of the three-way valve 17. The second outlet of the three-way valve 17 is provided with a second capillary tube 2.
1, Fever 15, second suction pipe 23, check valve 1
8 are sequentially connected. Then, the outlet pipe of the R-eva 14 is connected to the pipe from the check valve 18, and the accumulator 1 is connected.
9. Connect to the suction port of the compressor 11 via the first suction pipe 22.

At this time, heat is exchanged between the second capillary tube 21 and the second suction pipe 23. Heat exchange is also performed between the first capillary tube 20 and the first suction pipe 22.

The first capillary tube 20 and the second
A capillary tube 21, a first suction pipe 22,
The second suction pipe 23 is buried inside the heat insulating box 9.

Further, the liquid tank 16 and the three-way valve 17
The check valve 18 and the accumulator 16 are arranged in the R chamber 30.

(Control Method) In the above-described refrigeration cycle, a mode for cooling the R chamber 30 (hereinafter referred to as a refrigeration mode) and a mode for cooling the F chamber 40 (hereinafter referred to as a refrigeration mode) by switching the three-way valve 17. Can be performed alternately. That is, by switching the three-way valve 17,
When a refrigerant flows through the R-eva 14, the R chamber 30 is cooled, and conversely, F
When a refrigerant is caused to flow through the evaporator 15, the F chamber 40 is cooled.

The effect of the refrigeration cycle will be described.

First, the three-way valve 17 is connected to the liquid tank 16
Since the throttle amount downstream of the liquid tank 16 is greatly different between the refrigeration mode and the freezing mode, more refrigerant can be stored in the refrigeration mode than in the refrigeration mode. Thereby, in the refrigeration mode in which the optimal refrigerant circulation amount is relatively large, the refrigerant storage amount of the liquid tank 16 can be reduced, and conversely, in the refrigeration mode in which the optimal refrigerant circulation amount is relatively small, the refrigerant storage amount of the liquid tank 16 can be reduced. Therefore, the refrigerant circulation amount can always be kept optimally.

Second, by installing the liquid tank 16 on the downstream side of the first capillary tube 20, the refrigerant in the liquid tank 16 can be promptly removed by the F-evacuator 15 or the R-evacuator 14 when the operation of each mode is switched. , The refrigerant delay is reduced.

Third, by exchanging heat between the second capillary tube 21 and the second suction pipe 23 and arranging the check valve 18 inside the R chamber 30, the check valve 1
8, the refrigerant temperature and the ambient temperature can be increased, and the uncertainty of the check valve 18 in a low temperature range can be prevented.

Fourth, by exchanging heat between the second capillary tube 21 and the second suction pipe 23, heat loss can be reduced.

Fifth, by connecting the accumulator 19 after the pipes are joined and disposing the accumulator 19 inside the R chamber 30, a single accumulator 19 can function in both the refrigeration mode and the freezing mode. So you can
It leads to cost reduction.

Sixth, since heat is exchanged between the first capillary tube 20 and the first suction pipe 22, heat loss can be reduced.

[0044]

As described above, according to the refrigerator of the present invention, the amount of circulating refrigerant in the refrigeration mode and the freezing mode can be optimized.

Further, it is possible to eliminate a refrigerant delay at the time of mode switching.

Further, since the refrigeration cycle can be constituted by one three-way valve, the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a refrigerator showing one embodiment of the present invention.

FIG. 2 is also a refrigeration cycle.

FIG. 3 is a block diagram of a first refrigeration cycle of a conventional example.

FIG. 4 is a block diagram of a second refrigeration cycle of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Compressor 12 Condenser 14 Reva 15 Feva 16 Liquid tank 17 Three-way valve 18 Check valve 19 Accumulator 20 1st capillary tube 21 2nd capillary tube 22 1st suction pipe 23 2nd suction pipe 30 R room 40F room

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) F25D 11/00 101 F25D 11/00 101U (72) Inventor Takashi Doi 1-6 Ota Toshiba-cho, Ibaraki-shi, Osaka F-term in Toshiba Osaka factory (reference) 3L045 AA06 BA01 CA02 DA02 EA01 HA02 HA07 JA16 PA04 PA05

Claims (6)

[Claims] 1. A compressor, a condenser, a first capillary tube, a liquid tank, and a three-way valve are connected in sequence, a first outlet of the three-way valve is connected to an evaporator for a refrigerator, and a second outlet of the three-way valve is connected. A second capillary tube at the outlet of
The evaporator for the freezer compartment and the second suction pipe are sequentially connected, the outlet pipe of the evaporator for the refrigerator compartment is connected to the outlet of the second suction pipe, and the first suction pipe is connected to the suction port of the compressor. A refrigerator characterized by being made. 2. The first capillary tube and the first capillary tube.
The refrigerator according to claim 1, wherein the suction pipe exchanges heat. 3. The second capillary tube and the second capillary tube.
The refrigerator according to claim 1, wherein the suction pipe exchanges heat. 4. The refrigerator according to claim 1, wherein the liquid tank and the three-way valve are provided in a refrigerator. 5. The refrigerator according to claim 1, wherein an accumulator is connected to an inlet of the first suction pipe, and the accumulator is provided in a refrigerator. 6. The refrigerator according to claim 1, wherein a check valve is provided at an outlet of the second suction pipe, and the check valve is provided in the refrigerator compartment.