JP2002122374A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in a conventional refrigerator that the freshness of stores stored in a chamber not in preference drops when a refrigerating chamber and a freezing chamber come to the set temperature or over at the same time, or that the energy consumption becomes high because each chamber is cooled individually. SOLUTION: A common branching valve 5 is provided between each throttle device 3 and 6 and a condenser 2 so as to make a refrigerating cycle, and when refrigerants are allowed to flow at the same time to at least two or more evaporators 4 and 7 out of plural pieces of evaporators 4 and 7 by the above branching valve 5, either the refrigerant which is separated into a refrigerant mainly composed of a liquid refrigerant and a refrigerant mainly composed of a gas refrigerant by the above branching valve 5 is sent out to each throttle device 3 and 6 stated above from the above branching valve 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator having a refrigerating cycle having a plurality of evaporators.

[0002]

2. Description of the Related Art A conventional refrigerator of this type has a refrigerator compartment and a freezer compartment as disclosed in Japanese Patent Application Laid-Open No. 10-47827, for example. Providing a device and a freezer compartment temperature sensing device, a compressor, a plurality of evaporators connected in parallel to the compressor,
A throttle device provided corresponding to each of the evaporators, a condenser, and a refrigerant channel are provided to form a refrigeration cycle, and the evaporator includes a refrigerator-room evaporator and a freezer-room evaporator. A cooling room fan and a freezing room fan for cooling each of the evaporators; a condenser fan for cooling at least a part of the condenser; and a cooling room evaporator for the refrigeration cycle. A branch valve is provided between the expansion device connected to the condenser and the condenser, and the refrigerating room fan and the freezing room fan are operated alternately, and the branch valve is opened and closed in synchronization with the operation of the refrigerating room fan. In some cases, the refrigerating capacity is reduced during the cooling operation of the refrigerator compartment compared to the cooling operation of the freezing compartment.

[0003]

In the refrigerator as described above, when the temperature of the refrigerating compartment and the refrigerating compartment are simultaneously higher than a set temperature (for example: a large amount of newly stored articles are put in the refrigerating compartment and the refrigerating compartment at the same time, and both of them are put together). The room temperature rises.), The problem that freshness of the storage items stored in the non-priority storage rooms (for example, refrigeration rooms) decreases, and the energy consumption is high because each room is cooled individually. There was a problem of becoming.

[0004]

SUMMARY OF THE INVENTION The refrigerator of the present invention has solved the above-mentioned problems. The refrigerator of the present invention has a plurality of storage compartments and has a condenser connected to the discharge side of the compressor. ,
A plurality of evaporators connected in parallel to the discharge side of the condenser and the suction side of the compressor, a dedicated throttle device provided corresponding to each of the evaporators, and a refrigerant flow path Providing a common branch valve between each of the throttle devices and the condenser to form a refrigeration cycle, and simultaneously flowing refrigerant to at least two or more evaporators of the plurality of evaporators at the branch valve; One of the refrigerant separated into a refrigerant mainly composed of a liquid refrigerant and a refrigerant mainly composed of a gas refrigerant in the branch valve,
The liquid is sent out from the branch valve to each of the throttle devices.

The refrigerator of the present invention has at least a refrigerator compartment and a freezer compartment, and connects a condenser to a discharge side of the compressor.
A refrigerator-evaporator and a freezer-room evaporator connected in parallel to the discharge side of the condenser and the suction side of the compressor, and a dedicated throttle device provided corresponding to each of the evaporators, A refrigerant flow path, and a common branch valve is provided between each of the expansion devices and the condenser to form a refrigeration cycle, and the branch valve allows the refrigerator evaporator and the freezer evaporator to be simultaneously provided. When flowing the refrigerant, the refrigerant separated into the refrigerant mainly composed of liquid refrigerant and the refrigerant mainly composed of gas refrigerant at the branch valve, and the refrigerant sent from the branch valve to the expansion device side of the refrigerator compartment evaporator is a liquid refrigerant. And the refrigerant to be sent to the expansion device on the side of the freezer evaporator is a refrigerant mainly composed of a gas refrigerant.

In the refrigerator of the present invention, the branch valve separates a refrigerant mainly composed of a liquid refrigerant and a refrigerant mainly composed of a gas refrigerant, and each of the plurality of outlets of the branch valve is adjusted according to cycle setting conditions. It is characterized by being located at or near one of a refrigerant mainly composed of a liquid refrigerant and a refrigerant mainly composed of a gas refrigerant.

In the refrigerator according to the present invention, the branch valve is a three-way valve. The three-way valve separates a refrigerant mainly composed of a liquid refrigerant and a refrigerant mainly composed of a gas refrigerant. The positional relationship is inclined or up and down, and the branch valve is positioned with at least one of the plurality of outlets of the branch valve being on the refrigerant side mainly composed of liquid refrigerant in accordance with cycle setting conditions. Things.

Further, in the refrigerator according to the present invention, the branch valve is a three-way valve having an inlet / outlet on one side, and the inlet / outlet is downward and the three-way valve is inclined, or the inlet / outlet is connected to the side. It is characterized in that it is located on the side.

Further, in the refrigerator according to the present invention, the branch valve is a check valve having an open / close outlet opened and closed by a needle and an open outlet which is always opened. Separated into a refrigerant mainly composed of a gas refrigerant, and in accordance with cycle setting conditions, the plurality of outlets of the check valve are provided at or near a refrigerant side mainly composed of a liquid refrigerant or a refrigerant side mainly composed of a gas refrigerant. The check valve is located.

Further, in the refrigerator according to the present invention, when the check valve closes the opening / closing outlet with a needle, a part of the needle is buried in the refrigerant mainly composed of the liquid refrigerant, so that the liquid refrigerant is cooled. The liquid surface of the refrigerant as the main component rises, so that the open outlet is always covered with the refrigerant mainly as the liquid refrigerant, and when the open / close outlet of the check valve is closed, the refrigerant flowing out of the open outlet is And a refrigerant mainly composed of a liquid refrigerant.

The refrigerator according to the present invention is characterized in that the refrigerant mainly composed of the gas refrigerant is only a wet gas refrigerant.

Further, the refrigerator of the present invention is characterized in that in the refrigeration cycle, a common throttle device is provided between the condenser and the branch valve.

Further, the refrigerator according to the present invention is characterized in that in the refrigerating cycle, a common throttle device is provided between the condenser and the branch valve, and also serves as at least one dedicated throttle device. .

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a refrigerator according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a refrigerator according to the present invention.
FIG. 2 is an explanatory view of a check valve of the refrigerator of the present invention, and FIG.
FIG. 3 is an explanatory view of a three-way valve of the refrigerator of the present invention.

In FIG. 1, 1 is a compressor, 2 is a condenser,
3 is a freezing room expansion device connected to the freezing room evaporator 4;
Is a branch valve, 6 is a refrigerating room expansion device connected to a refrigerating room evaporator 7, 8 is a condenser fan for cooling at least a part of the condenser 2, and 9 is a cooling by the freezing room evaporator 4. A freezing room fan for sending out the cooled air to the freezing room 10, a freezing room fan 11 for sending out the cold air cooled by the cold room evaporator 7 to the freezing room 12, and a freezing room temperature sensor 13. , 14 are refrigerator temperature sensing devices.

The expansion device 3 for the freezer compartment and the evaporator 4 for the freezer room, the expansion device 6 for the refrigerator compartment and the evaporator 7 for the refrigerator compartment are connected in parallel, and the branch valve 5 is connected to the expansion device for the freezer compartment. 3,
The compressor 1, the condenser 2, the branch valve 5, the freezing room throttle device 3, the freezing room evaporator are provided between the respective throttle devices of the refrigerator room throttle device 6 and the condenser 2. 4. The refrigerating room expansion device 6 and the refrigerating room evaporator 7 form a refrigeration cycle.

Then, both the freezer compartment 10 and the refrigerator compartment 12 are set at a set temperature (for example: set temperature: freezer compartment 10 = −18 ° C.,
When the temperature is higher than the refrigerator compartment 12 = 5 ° C.), the freezer compartment temperature sensing device 13 and the refrigerator compartment temperature sensing device 14 sense the room temperature, the compressor 1 is operated by the control device (not shown), and the condenser 2 liquefies. A part of the refrigerant thus obtained passes through the open branch valve 5, passes through the freezing-room throttle device 3, evaporates in the freezing-room evaporator 4, and removes heat from the surrounding air to flow. A part of the refrigerant liquefied in the above flows from the open branch valve 5 through the refrigerating room throttle device 6 and evaporates in the refrigerating room evaporator 7 while taking heat from the surrounding air, and flows in a vaporized state. Returning to the compressor 1, a series of refrigeration cycles is performed.

At this time, the condenser fan 8, the freezing room fan 9 and the refrigerating room fan 11 are also operated in synchronism, and the condenser fan 8 cools the condenser 2 and assists the liquefaction of the refrigerant. The cooling fan 9 and the refrigerator compartment fan 11 send cold air cooled by the freezer compartment evaporator 4 and the refrigerator compartment evaporator 7 to the freezer compartment 10 and the refrigerator compartment 12, respectively.
2 will be cooled to a predetermined room temperature. for that reason,
Even if many storage items are newly stored in the freezer compartment 10 or the refrigerator compartment 12 at the same time, the storage components are immediately cooled and deterioration of the storage components can be prevented.

The refrigerating room 12 has a predetermined room temperature (for example:
When the temperature reaches 3 ° C.), the outlet of the branch valve 5 on the side of the refrigerating room throttle device 6 is closed, and the refrigerant does not flow into the refrigerating room evaporator 7. After a predetermined time has elapsed, the refrigerator compartment fan 11 is stopped.

At this time, if the freezing room 10 is not at a predetermined temperature (for example, -18 ° C.), the operation of the compressor 1, the condenser fan 8 and the freezing room fan 9 is continued, and the compressor 1 Is reduced to a predetermined value by a control device (not shown), and at the same time, the number of rotations of the condenser fan 8 is also reduced to a speed corresponding to the capacity. Therefore, the compressor 1 and the condenser fan 8 are operated efficiently, which leads to energy saving.

If the operation of the refrigerating room fan 11 is reduced to a predetermined number of revolutions and the operation is continued, the cooling air in the refrigerating room 12 is agitated.
When the refrigerator compartment evaporator 7 is in a frosted state, the cold air in the refrigerator compartment 12 is useful for defrosting the refrigerator compartment evaporator 7, and the defrosting also serves to humidify the refrigerator compartment 12. Useful.

Further, the temperature of the refrigerator compartment 12 becomes higher than a predetermined room temperature (for example, 5 ° C.).
When the temperature is equal to or lower than a set predetermined room temperature (for example, −18 ° C.), the freezer compartment temperature sensing device 13 or the refrigerator compartment temperature sensing device 1
4 senses each room temperature, and based on the sensed temperature, the refrigerating room 10 and the refrigerating room 12 are both set at a set temperature (for example, the refrigerating room 12 is controlled by a control device (not shown)) according to the required capacity. : Set temperature: freezer compartment 10 = -18 ° C, refrigerator compartment 12 =
5 [deg.] C.), and is operated at a lower capacity than when simultaneously cooling the freezing room 10 and the refrigerating room 12. Since the operation is performed at a lowered level, the compressor 1, the condenser fan 8, and the freezing room fan 9 are efficiently operated, which leads to energy saving.

At this time, in order to prevent the freezing room 10 from being excessively cooled (for example, a temperature of −21 ° C. or less), the switching temperature for the freezing room by the freezing room temperature sensing device 13 is set. Higher (eg: switching temperature = −2
Raise from 1 ° C to -19 ° C. As described above, the setting of the control device (not shown) is changed based on the respective room temperatures, and the control device (not shown) is changed based on the sensing state of the freezing room temperature sensing device 13 and the refrigerator compartment temperature sensing device 14. In the drawing, the refrigerating capacity of the compressor 1 is changed according to the required capacity, and the refrigerating chamber 10 and the refrigerating chamber 12 are switched to be operated at a lower capacity than when they are simultaneously cooled. The number of revolutions of the room fan 9 is also switched by a control device (not shown) in accordance with the rotation of the room fan 9 so as to be operated.

As described above, the freezing compartment 10 is not excessively cooled (supercooled), but can be appropriately maintained in a cooling state against the invasion of heat from the outside.
The number of FFs does not increase, and therefore, the power consumption required in a large amount at the time of starting the compressor 1 does not increase, the power consumption is small, and the refrigerator compartment 12 and the freezer compartment 10 can be efficiently cooled, and the efficiency can be further improved. The compressor 1, the condenser fan 8, and the freezing room fan 9 are operated, which leads to further energy saving.

At this time, as a means for changing the refrigerating capacity of the compressor, a method of reducing the number of rotations of the compressor motor and reducing the number of times of compression of the piston moving in conjunction therewith to reduce the amount of refrigerant circulating in the refrigeration cycle, The throttle device 3 and the refrigerating room throttle device 6 are made into a throttle device including at least a switching type throttle device of a combination of a variable throttle valve or an on-off valve and a capillary tube adapted to several types of states,
A restricting state in which the refrigerant flow and the pressure difference match those states (for example: the restricting device 3 for the freezing room and the restricting device 6 for the refrigerating room are throttled in accordance with the lowering ability of the compressor 1).

In FIG. 2, this figure is a schematic view of a check valve 15 serving as the branch valve 5, having a solenoid valve mechanism 15b including a needle 15a for opening and closing the outlet, an inlet 15c and two outlets 15d. , 15e. Further, the inlet 15c and the outlet 15d are on the same side, the outlet 15d is located above the outlet 15c, and the outlet 15e is located lower than the inlet 15c. The outlet 15e is openable and closable by the movement of the needle 15a.

The inlet 15c of the check valve 15 is connected to the condenser 2 and the outlet 15d is connected to the freezing room throttle device 3.
The outlets 15e are connected to the refrigerating room expansion devices 6, respectively. Then, both the freezer compartment 10 and the refrigerator compartment 12 are set at a set temperature (for example: set temperature: freezer compartment 10 = −18 ° C., refrigerator compartment 1
2 = 5 ° C.), the freezing room temperature sensing device 13 and the refrigerator compartment temperature sensing device 14 sense the room temperature, and the control device (not shown) energizes the solenoid valve mechanism 15b of the check valve 15 to feed the needle 15a. Moves upward, and the outlet 15e is opened.

Then, the compressor 1 is operated, and the refrigerant liquefied in the condenser 2 flows into the chamber 15f from the inlet 15c of the check valve 15, and then to the outlet 15d.
From the cryostat, and the freezing room expansion device 3 and the freezing room evaporator 4
The refrigerant flows from the surrounding air while expanding and drying while evaporating and drying, and the refrigerant liquefied in the condenser 2 flows into the chamber 15f from the inlet 15c of the check valve 15 and then opens. Exit 15e
From the refrigeration compartment 6 and the refrigeration compartment evaporator 7
As a result, heat flows from the surrounding air while expanding and drying and vaporizing, and the refrigerant returns to the compressor 1 in a vaporized state.

At this time, the refrigerant is gas-liquid separated in the chamber 15f of the check valve 15, so that a refrigerant mainly composed of a gas refrigerant exists above the chamber and a refrigerant mainly composed of a liquid refrigerant exists below the chamber. The volume within 15f is set.

The outlet 15d is located in the upper region of the refrigerant mainly composed of gas refrigerant, and the outlet 15e is located in the lower region of the refrigerant mainly composed of liquid refrigerant. The refrigerant flowing through the device 3 to the freezer compartment evaporator 4 is a refrigerant mainly composed of a gas refrigerant, and the refrigerant flowing through the refrigerator compartment expansion device 6 to the refrigerator compartment evaporator 7 is a refrigerant mainly composed of a liquid refrigerant. Therefore, the refrigerating room expansion device 6
Is smaller than the throttle amount of the freezing room throttle device 3, and even if the refrigerating room throttle device 6 is set to a smaller pressure reduction amount than the freezing room throttle device 3, As a result, stable refrigerant flows can be obtained from the outlets 15d and 15e to the freezing room expansion device 3 and the refrigerator room expansion device 6, respectively.

In the above, the refrigerant at the outlet 15d flowing through the freezing room expansion device 3 to the freezing room evaporator 4 is:
When only the wet gas refrigerant is used, the cooling capacity is reduced, but the refrigerant flow becomes more stable, and the outlet 1 flowing to the freezer compartment evaporator 4 through the freezer throttle device 3 is used.
When the refrigerant at 5d is a gas-liquid refrigerant and has a large liquid ratio, the refrigerating ability is improved, but the instability of the refrigerant flow is increased. When the refrigerant flow becomes unstable, the difference between the throttle amount of the refrigerating room throttle device 6 and the throttle amount of the freezing room throttle device 3 may be reduced to stabilize the refrigerant flow. .

When the fluid passing through a predetermined throttle device (for example, a capillary tube) is a liquid and a gas, the fluid resistance when the same volume passes for a predetermined time is:
Due to the effect of the viscosity, when the liquid passes through the expansion device, the liquid refrigerant becomes larger. Therefore, when the refrigerant flows through the expansion device 6 for the refrigerator and the expansion device 3 for the freezing room at the same time, the liquid refrigerant flows through both the expansion devices. Compared with the case, the liquid refrigerant flows only to the refrigerator-room throttle device 6 and the other freezer-room throttle device 3 flows the gaseous refrigerant, which is a combination of the refrigerator-room throttle device 6 and the freezer-room throttle device 3. Fluid resistance is reduced.

Therefore, compared to the case where the refrigerant mainly composed of the liquid refrigerant flows simultaneously through the refrigerating room expansion device 6 and the freezing room expansion device 3, the refrigerant mainly composed of the liquid refrigerant flows only through the refrigerating room expansion device 6. On the other hand, when the refrigerant mainly composed of gaseous refrigerant flows, the combined fluid resistance is lower and the evaporation temperature of the other freezing room expansion device 3 is higher, so that the evaporation temperature of the refrigerator compartment evaporator 7 is stable. Thus, it can be set high while maintaining the state of the refrigerant flow.

Further, since the refrigerant mainly composed of the liquid refrigerant flows to the refrigerating room expansion device 6 side, the cooling power of the refrigerating room evaporator 7 side can be kept high, and the evaporator capacity of the refrigerating room evaporator 7 side can be maintained. Becomes larger.

Then, the main body of the check valve 15 is appropriately inclined or the refrigerant surface mainly composed of the liquid refrigerant and the outlet 1 are formed.
By adjusting the height relationship with the refrigerant 5d, the refrigerant flowing from the outlet 15e through the expansion device 6 for the refrigerator to the evaporator 7 for the refrigerator is a refrigerant mainly composed of a liquid refrigerant.
The refrigerant flowing from d to the freezing room expansion device 3 can be set to be a refrigerant mainly composed of a gas refrigerant, and the gas-liquid ratio of the refrigerant flowing therethrough is appropriately adjusted. A refrigeration cycle is obtained in which the respective refrigerants stably flow simultaneously through the refrigerating compartment evaporator 7 in an optimal cooling state.

The position of each of the outlets may be set at an appropriate position with respect to the refrigerant surface mainly composed of the liquid refrigerant in accordance with the set conditions. Note that this drawing shows an example in which the refrigerant surface mainly composed of the liquid refrigerant is at an appropriate position, the check valve 15 does not need to be inclined, and the necessary setting conditions are satisfied.

For this reason, the check valve 15 separates the refrigerant mainly composed of liquid refrigerant and the refrigerant mainly composed of gas refrigerant, and each of the plurality of outlets of the branch valve is mainly composed of liquid refrigerant in accordance with cycle setting conditions. If it is located at or near one of the refrigerant side or the refrigerant side mainly composed of a gas refrigerant, the gas-liquid ratio of the refrigerant flowing through each will be appropriately adjusted, and the refrigerant will be simultaneously passed through a plurality of evaporators. A refrigeration cycle that maintains the optimal cooling state of each of the evaporators that flows stably is obtained.

It is preferable that the check valve 15 is fixed to the refrigerator body in the state where the check valve 15 body is adjusted as described above.

Further, a common throttle device (not shown) is provided between the condenser 2 and the check valve 15 which is the branch valve 5, and if the pressure is reduced to some extent, the refrigerant liquefied in the condenser 2 However, the gas passes through the common expansion device to become a gas-liquid refrigerant, and the refrigerant is separated into a gas and a liquid in the chamber 15f of the check valve 15, and the refrigerant mainly composed of a gas refrigerant upward and the liquid refrigerant mainly composed of a downward refrigerant. Refrigerant that is present is more likely to be present.

When the outlet 15e of the check valve 15 is closed by the needle 15a, a part of the needle 15a is buried in the refrigerant mainly composed of the liquid refrigerant. When the liquid level of the refrigerant mainly composed of the liquid refrigerant rises and the outlet 15d is always covered with the refrigerant mainly composed of the liquid refrigerant during the refrigeration cycle operation, The refrigerant mainly composed of the liquid refrigerant always flows out from the outlet 15d, and the evaporator capacity on the side of the freezer compartment evaporator 4 can always be kept large, and the cooling capacity of the freezer compartment evaporator 4 is improved.

Further, even if the inlet 15c is provided in a region other than the region between the needle 15a and the outlet 15e when the outlet 15e is closed by the needle 15a, the same effect as described above can be obtained.

In FIG. 3, this figure is a schematic view of a three-way valve 16 serving as the branch valve 5. The three-way valve 16 has an opening / closing valve mechanism 16b including a ball 16a for opening / closing an outlet.
There are outlets 16d and 16e at each location. The ball 16a is constantly subjected to an upward lifting force from below by a coil spring (not shown) or the like.

The inlet 16c, outlets 16d, 16
e is on the same side, and the ball 16a moves on the outlet 16e by rotating the opening / closing valve mechanism 16b in a substantially horizontal direction (the rotation axis is an axis passing vertically through the center in the left-right direction of the three-way valve 16). The outlet 16e is opened and closed by the ball 16a, and the outlet 16e can be opened and closed.

The inlet 16c of the three-way valve 16 is connected to the condenser 2; the outlet 16d is connected to the freezing room throttle device 3;
“e” is connected to the refrigerator-room expansion device 6. In addition,
In this drawing, the ball 16a is provided only above the outlet 16e, but a similar ball or the like may be provided above the outlet 16d so as to be openable and closable.

Then, the freezer compartment 10 and the refrigerator compartment 12 are both set at a set temperature (for example: set temperature: freezer 10 = −18 ° C.,
When the temperature is higher than the refrigerator compartment 12 = 5 ° C.), the freezer compartment temperature sensing device 13 and the refrigerator compartment temperature sensing device 14 sense the room temperature, and the opening / closing valve mechanism 16b of the three-way valve 16 is substantially horizontal by the control device (not shown). By rotating in the direction, the ball 16a moves upward, and the outlet 16e is opened as shown in FIG.

Then, the compressor 1 is operated, and the refrigerant liquefied in the condenser 2 passes through the outlet 16 d of the three-way valve 16, passes through the freezing room expansion device 3, and expands and dries in the freezing room evaporator 4 while evaporating. The refrigerant takes heat from the surrounding air to flow, and the refrigerant liquefied in the condenser 2 is discharged from the outlet 16 of the three-way valve 16.
e, heat flows from surrounding air while expanding and drying and evaporating in the refrigerator evaporator 7 through the refrigerator-room expansion device 6, and flows.
The refrigerant returns to the compressor 1 in a vaporized state.

At this time, the refrigerant is separated into gas and liquid in the chamber 16f of the three-way valve 16 so that a refrigerant mainly composed of a gas refrigerant exists above the refrigerant and a refrigerant mainly composed of the liquid refrigerant exists below the chamber. The volume within 16f is set.

The outlet 16d is located in the upper region of the refrigerant mainly composed of the gas refrigerant, and the outlet 16e is located in the region of the lower refrigerant mainly composed of the liquid refrigerant. The refrigerant flowing through the device 3 to the freezer compartment evaporator 4 is a refrigerant mainly composed of a gas refrigerant, and the refrigerant flowing through the refrigerator compartment expansion device 6 to the refrigerator compartment evaporator 7 is a refrigerant mainly composed of a liquid refrigerant. Therefore, the refrigerating room expansion device 6
Is smaller than the throttle amount of the freezing room throttle device 3, and even if the refrigerating room throttle device 6 is set to a smaller pressure reduction amount than the freezing room throttle device 3, As a result, a stable refrigerant flow can be obtained from the outlets 16d and 16e to the freezing room expansion device 3 and the refrigerator room expansion device 6, respectively.

In the above, the refrigerant at the outlet 16d flowing to the freezer compartment evaporator 4 through the freezer compartment expansion device 3 is:
When only the wet gas refrigerant is used, or when the refrigerant at the outlet 16d flowing through the freezing room expansion device 3 to the freezing room evaporator 4 is a gas-liquid refrigerant and has a large liquid ratio, or is refrigerated. In the case where the refrigerant mainly composed of the liquid refrigerant flows only in the room expansion device 6 and the other refrigerant room expansion device 3 flows the refrigerant mainly composed of the gas refrigerant, the characteristics are the same as when the check valve is used. Become.

The main body of the three-way valve 16 as shown in FIG.
By adjusting the height relationship with the outlet 16d, the outlet 16d
The vapor-liquid ratio of the refrigerant mainly composed of the gas refrigerant flowing from the refrigerant to the freezer compartment expansion device 3 is adjusted, and the respective evaporators through which the refrigerant flows stably through the freezer compartment evaporator 4 and the refrigerator compartment evaporator 7 simultaneously. Thus, it is preferable that the three-way valve 16 is fixed to the refrigerator main body in an inclined state of the main body.

A common throttle device (not shown) is provided between the condenser 2 and the three-way valve 16 which is the branch valve 5.
When the pressure is reduced to some extent, the refrigerant liquefied in the condenser 2 passes through the common throttle device to become a gas-liquid refrigerant as in the case of the check valve 15 in FIG.
In the chamber 16f, the refrigerant is separated into gas and liquid, so that a refrigerant mainly composed of a gas refrigerant is more likely to exist above, and a refrigerant mainly composed of a liquid refrigerant is more likely to exist below.

If the difference between the height of the outlet 16d and the height of the outlet 16e is 1.5 mm or more, the above effect by gas-liquid separation can be sufficiently obtained, and the three-way valve 16 as shown in FIG. When the rotation axis is vertical, the outlet 16d and the outlet 16e are in a horizontal position. Specifically, the horizontal distance between the outlet 16d and the outlet 16e is 8.5 mm, and the three-way On-off valve mechanism 16b of valve 16
The three-way valve 16 is tilted so that the rotation axis of the three-way valve is tilted by 15 °, and the outlet 16e is about 2.2 m in the vertical direction from the outlet 16d.
When the distance is set to be lower by about m as shown in FIG. 3, the above-mentioned effect can be obtained more reliably and stably, and a refrigerator with high productivity can be obtained.

The same effect can be obtained even if the inlet 16c of the three-way valve 16 is provided on the side, and the outlet 16d of the three-way valve 16 is provided at a position corresponding to the outlet 15d of the check valve 15. However, the same effect as described above can be obtained.

Further, the inclination angle of the branch valve 5 such as the check valve 15 or the three-way valve 16 is set to a decimal value (for example, 12
°, 15 °, 17 ° etc.) so that it can be set and fixed, and variations on the refrigeration cycle in mass production (throttle device, evaporator,
By taking into account the variation in the combination of the condenser, the compressor, the refrigerant charge, and the like, it is possible to obtain a high-efficiency refrigerator that can be finely adjusted on the cycle and has a more stable cooling state.

When a common throttle device (not shown) is provided, if the common throttle device is set to a throttle amount equivalent to that of a predetermined dedicated throttle device (for example, a refrigerator room throttle device), the exclusive throttle device is set. The squeezing device can be omitted, the refrigeration cycle can be simplified, and workability, quality reliability, and cost performance are improved.

The above is an example of a refrigerating cycle provided with the evaporator 4 for the freezer compartment and the evaporator 7 for the refrigerating compartment. Like the above evaporators, a plurality of evaporators are provided. And a throttle device corresponding to the setting of the evaporator are provided, and each of the throttle devices is connected to an outlet meeting the set conditions at the outlet of the check valve 15 or the three-way valve 16 as the branch valve 5. Then, it is apparent that the same effect as described above can be obtained, for example, by changing the gas-liquid mixing ratio of the refrigerant flow to change the refrigeration capacity.

[0058]

According to the present invention, the refrigerator of the present invention is constructed as described above. Therefore, according to the present invention, when a refrigerator, a freezer, or the like is provided, the load of the refrigerator, the freezer, and the other storages varies. Thus, a refrigerator having a high-efficiency refrigeration cycle with less energy loss can be obtained. Moreover, a refrigeration cycle that can stably and simultaneously flow the refrigerant to a plurality of evaporators such as a freezer evaporator and a refrigerator evaporator can be obtained, which maintains the optimal cooling power of each evaporator. .

[Brief description of the drawings]

FIG. 1 is a block diagram of a refrigerator according to the present invention.

FIG. 2 is an explanatory view of a check valve of the refrigerator of the present invention.

FIG. 3 is an explanatory view of a three-way valve of the refrigerator of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Condenser 3 Refrigerating room throttle device 4 Refrigerating room evaporator 5 Branch valve 6 Refrigerating room throttling device 7 Refrigerating room evaporator 10 Freezing room 12 Refrigerating room 15 Check valve 15a Needle 15d Exit (opening exit) 15e outlet (opening / closing outlet) 16 three-way valve 16d outlet 16e outlet

Claims (10)

[Claims] A condenser connected to a discharge side of the compressor; a plurality of evaporators connected in parallel to a discharge side of the condenser and a suction side of the compressor; A dedicated throttling device provided for each of the evaporators, and a refrigerant flow path, and a common branch valve is provided between each of the throttling devices and the condenser to form a refrigeration cycle, When the refrigerant flows simultaneously into at least two or more evaporators of the plurality of evaporators at the branch valve, any of a refrigerant separated into a refrigerant mainly composed of a liquid refrigerant and a refrigerant mainly composed of a gas refrigerant at the branch valve. Refrigerator characterized in that one of them is sent out from the branch valve to each of the expansion devices. 2. A refrigerator-evaporator having at least a refrigerator compartment and a freezer compartment, having a condenser connected to a discharge side of the compressor, and being connected in parallel to a discharge side of the condenser and a suction side of the compressor. And a freezing room evaporator, a dedicated throttle device provided corresponding to each of the evaporators, and a refrigerant flow path, and a common branch valve between each of the throttle devices and the condenser. When the refrigerant flows simultaneously to the evaporator for the refrigerator and the evaporator for the freezer at the branch valve, a refrigerant mainly composed of a liquid refrigerant and a refrigerant mainly composed of a gas refrigerant are provided at the branch valve. The refrigerant sent from the branch valve to the expansion device on the side of the refrigerator compartment evaporator is mainly a liquid refrigerant, and the refrigerant sent to the expansion device on the side of the freezer compartment evaporator is a gas refrigerant. A refrigerator characterized by being a refrigerant mainly composed of: 3. The branch valve is separated into a refrigerant mainly composed of a liquid refrigerant and a refrigerant mainly composed of a gas refrigerant, and each of a plurality of outlets of the branch valve is mainly composed of a liquid refrigerant in accordance with cycle setting conditions. 3. The refrigerator according to claim 1, wherein the refrigerator is located at or near one of a refrigerant and a refrigerant mainly composed of a gas refrigerant. 4. The branch valve is a three-way valve. The three-way valve separates a refrigerant mainly composed of a liquid refrigerant and a refrigerant mainly composed of a gas refrigerant. The position of the outlet of the three-way valve is inclined or vertically shifted. Relationship, according to the cycle setting conditions,
The refrigerator according to claim 1 or 2, wherein the branch valve is located with at least one of a plurality of outlets of the branch valve being a refrigerant mainly composed of a liquid refrigerant. 5. The branch valve is a three-way valve having an inlet / outlet on one side, and the inlet / outlet is downward and the three-way valve is inclined, or the inlet / outlet is located on the side. The refrigerator according to claim 4, characterized in that: 6. The branch valve is a check valve having an opening / closing outlet that is opened and closed by a needle and an open outlet that is always open, and a refrigerant mainly composed of a liquid refrigerant and a refrigerant mainly composed of a gas refrigerant in the check valve. In accordance with the cycle setting conditions, the plurality of outlets of the check valve are located at or near one of the refrigerant side mainly composed of liquid refrigerant and the refrigerant side mainly composed of gas refrigerant. The refrigerator according to claim 1 or 2, wherein: 7. When the check valve closes the opening / closing outlet with a needle, a part of the needle is buried in a refrigerant mainly composed of a liquid refrigerant, whereby a liquid of the refrigerant mainly composed of a liquid refrigerant is formed. The surface rises, so that the open outlet is always covered with a refrigerant mainly composed of liquid refrigerant, and when the open / close outlet of the check valve is closed, the refrigerant flowing out of the open outlet is mainly composed of liquid refrigerant. The refrigerator according to claim 6, wherein the refrigerator is a refrigerant. 8. The refrigerator according to claim 1, wherein the refrigerant mainly composed of the gas refrigerant is only a wet gas refrigerant. 9. The refrigerator according to claim 1, wherein a common throttle device is provided between the condenser and the branch valve in the refrigeration cycle. 10. The refrigerator according to claim 9, wherein a common throttle device is provided between the condenser and the branch valve in the refrigeration cycle, and the refrigerator also serves as at least one dedicated throttle device.