JP4380905B2 - refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a refrigerator having a refrigeration cycle having a plurality of evaporators.
[0002]
[Prior art]
A conventional refrigerator of this type has a refrigerator compartment and a freezer compartment as disclosed in, for example, Japanese Patent Application Laid-Open No. 10-47827, and each room has a refrigerator compartment temperature sensing device and a freezer compartment temperature detector. A sensing device; a compressor; a plurality of evaporators connected in parallel to the compressor; a throttling device provided corresponding to each of the evaporators; a condenser; and a refrigerant flow path. Comprising a refrigeration cycle, and the evaporator includes a refrigerator for a refrigerator compartment and an evaporator for a refrigerator compartment, and has a refrigerator compartment fan and a refrigerator compartment fan for cooling each of the evaporators, A condenser fan for cooling at least a part of the condenser is provided, and a branch valve is provided between the condensing device connected to the evaporator for the refrigerator compartment of the refrigeration cycle and the condenser, and the refrigerator fan and the freezer compartment The fans for the refrigerator are operated alternately to Synchronization with the operation to open and close the branch valve, during the cooling operation of the refrigerating chamber there is to reduce the cooling capacity as compared to during the cooling operation of the freezing chamber.
[0003]
[Problems to be solved by the invention]
In the refrigerator as described above, when the refrigerator compartment and the freezer compartment simultaneously reach the set temperature or higher (for example: a new amount of stored items are simultaneously put in the refrigerator compartment and the freezer compartment, and the room temperature of both is raised). There is a problem that the freshness of the stored items stored in the storage room (for example: refrigerated room) not being reduced, and a problem that energy consumption is increased because each room is individually cooled.
[0004]
[Means for Solving the Problems]
The refrigerator of the present invention solves the above-described problems, and includes a refrigerator compartment, a freezer compartment, a refrigerant passage through which a refrigerant flows, a compressor that operates a refrigeration cycle by the circulation of the refrigerant, and the compressor. A condenser connected to the discharge side, and arranged between the discharge side of the condenser and the suction side of the compressor, and generates cold air that flows only into the refrigerating room within the refrigerating room and the freezing room A refrigerating room evaporator, and a refrigerating room disposed between the discharge side of the condenser and the suction side of the compressor in parallel with the refrigerating room evaporator and within the refrigerating room and the freezing room. A freezer compartment evaporator that generates cold air flowing into the refrigerator, a first throttle device provided corresponding to the refrigerator refrigerator, and a second throttle device provided corresponding to the freezer evaporator , Arranged at the branch point of the refrigerant flow path branched at the discharge side of the condenser And a that branch valve,
The branch valve is provided on the bottom surface of the chamber and connected to the first throttling device, a needle that opens and closes the first outlet portion, and an inlet portion that is provided on a side surface of the chamber and into which the refrigerant flows. When the first outlet portion is closed by the needle and is provided on the side surface of the chamber, the liquid surface is always covered by the liquid refrigerant whose liquid level has risen due to part of the needle being buried in the liquid refrigerant. A second outlet portion disposed above the liquid level of the liquid refrigerant that descends when the outlet portion is opened, and the first outlet portion is opened to evaporate the refrigerator compartment and the freezer compartment. Switching between a state in which the refrigerant is supplied to the refrigerator and a state in which the first outlet is closed and the refrigerant is supplied only to the freezer evaporator,
When the refrigerant is supplied from the branch valve to the refrigerator for the refrigerator compartment and the evaporator for the freezer compartment, the refrigerant sent out to the first throttling device is mainly liquid refrigerant and the refrigerant sent out to the second throttling device is mainly gas refrigerant. In addition, the pressure reducing amount of the first throttle device is smaller than the pressure reducing amount of the second throttle device .
[0012]
The refrigerator of the present invention is characterized in that a third expansion device is provided between the condenser and the branch valve .
[0013]
The refrigerator of the present invention is characterized in that the third diaphragm device also serves as the first diaphragm device or the second diaphragm device .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the refrigerator of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 is a block diagram of the refrigerator of the present invention, FIG. 2 is a diagram of a check valve of the refrigerator of the present invention, and FIG. 3 is a diagram of a three-way valve of the refrigerator of the present invention.
[0016]
In FIG. 1, 1 is a compressor, 2 is a condenser, 3 is a freezer compartment throttle device connected to the freezer evaporator 4, 5 is a branch valve, and 6 is a refrigerator compartment throttle device connected to the refrigerator evaporator 7. , 8 is a condenser fan for cooling at least a part of the condenser 2, 9 is a freezer compartment fan for sending cold air cooled by the freezer evaporator 4 to the freezer compartment 10, A refrigerating room fan for sending out the cold air cooled by the refrigerating room evaporator 7 to the refrigerating room 12, 13 is a freezer temperature sensing device, and 14 is a refrigerating room temperature sensing device.
[0017]
The freezer compartment throttle device 3 and the freezer compartment evaporator 4, the refrigerator compartment throttle device 6 and the refrigerator compartment evaporator 7 are connected in parallel, and the branch valve 5 includes the freezer compartment throttle device 3, It is provided between each condensing device of the refrigerating chamber expansion device 6 and the condenser 2, and includes a compressor 1, a condenser 2, a branch valve 5, a freezing chamber expansion device 3, and a freezing chamber evaporator 4. The refrigerator 6 for the refrigerator compartment and the evaporator 7 for the refrigerator compartment form a refrigeration cycle.
[0018]
When both the freezer compartment 10 and the refrigerator compartment 12 are higher than a set temperature (for example: set temperature: freezer compartment 10 = −18 ° C., refrigerator compartment 12 = 5 ° C.), the freezer compartment temperature sensing device 13 and the refrigerator compartment temperature sensing device. 14 senses the room temperature, the compressor 1 is operated by a control device (not shown), and a part of the refrigerant liquefied by the condenser 2 is opened from the opened branch valve 5 to the freezing chamber expansion device 3. The refrigerant flows away from the surrounding air while evaporating in the freezer evaporator 4, and a part of the refrigerant liquefied in the condenser 2 is opened from the open branch valve 5 to the refrigerator compartment throttle. Heat flows from the surrounding air while evaporating in the refrigerator 7 for the refrigerator compartment through the apparatus 6 and flows back to the compressor 1 in a vaporized state to form a series of refrigeration cycles.
[0019]
At this time, the condenser fan 8, the freezer compartment fan 9, and the refrigerator compartment fan 11 are also operated in synchronization. The condenser fan 8 cools the condenser 2 and helps liquefy the refrigerant. The refrigeration room fan 11 sends cold air cooled by the refrigeration room evaporator 4 and the refrigeration room evaporator 7 to the freezing room 10 and the refrigeration room 12, respectively, and the freezing room 10 and the refrigeration room 12 are brought to a predetermined room temperature. It will cool. Therefore, even if a large number of stored items are newly stored in the freezer compartment 10 or the refrigerator compartment 12 at the same time, the stored items are immediately cooled and deterioration of the stored items can be prevented.
[0020]
When the refrigerator compartment 12 reaches a predetermined room temperature (for example, 3 ° C.), the outlet of the branch valve 5 on the side of the refrigerator for the refrigerator compartment 6 is closed, and the refrigerant does not flow into the evaporator 7 for the refrigerator compartment. And after predetermined time passes, the fan 11 for refrigerator compartments is stopped.
[0021]
At this time, if the freezer compartment 10 is not at a predetermined temperature (for example, −18 ° C.), the operation of the compressor 1, the condenser fan 8 and the freezer compartment fan 9 is continued. Is reduced to a predetermined value by a control device (not shown), and at the same time, the condenser fan 8 is also lowered to the number of rotations corresponding to the capacity. Therefore, the compressor 1 and the condenser fan 8 are operated efficiently, leading to energy saving.
[0022]
If the operation of the refrigerating room fan 11 is reduced to a predetermined number of rotations and the operation is continued as described above, it is useful for stirring the cool air in the refrigerating room 12, and further, the refrigerating room evaporator 7 is used. Is in a frosted state, it is useful for defrosting the evaporator 7 for refrigeration room by the cool air in the refrigeration room 12, and also for humidifying the refrigeration room 12 by the defrosting.
[0023]
In addition, when the refrigerator compartment 12 is higher than a predetermined room temperature (for example: 5 ° C.) and the freezer compartment 10 is below the predetermined room temperature (for example: −18 ° C.), the freezer temperature The sensing device 13 and the refrigerating room temperature sensing device 14 sense the respective room temperature, and based on the sensed temperature, the control device (not shown) sets the refrigerating capacity of the compressor 1 according to the necessary capacity. Both of the chambers 12 are operated with a higher capacity than the set temperature (for example: set temperature: freezer room 10 = −18 ° C., refrigerator room 12 = 5 ° C.) and lower capacity than when the freezer room 10 and the refrigerator room 12 are cooled simultaneously, Since the rotation speed of the condenser fan 8 and the freezer compartment fan 9 is also lowered and operated by a control device (not shown) accordingly, the compressor 1, the condenser fan 8 and the freezer compartment fan 9 are efficiently operated. Operation will lead to energy savings.
[0024]
At this time, in order to prevent the freezing room 10 from being in an excessively cooled state (for example, a temperature of −21 ° C. or lower) more than necessary, the switching temperature for the freezing room by the freezing room temperature sensing device 13 is increased ( For example: switching temperature = -21 ° C. to −19 ° C.) The setting of the control device (not shown) is changed based on the respective room temperatures, and the freezer temperature sensor 13 or refrigeration is set. Rather than when the freezing room 10 and the refrigerating room 12 are simultaneously cooled according to the required capacity of the compressor 1 based on the sensing state of the room temperature sensing device 14 according to the necessary capacity. It is switched and is operated with a low capacity, and the rotation speed of the condenser fan 8 and the freezer compartment fan 9 is also switched and lowered by a control device (not shown) accordingly.
[0025]
As a result, the freezing chamber 10 is not cooled (supercooled) more than necessary, and the cooling state can be appropriately maintained against the intrusion of heat from the outside, and the number of ON-OFF times of the compressor 1 is increased. For this reason, there is no increase in power consumption required when starting up the compressor 1, the power consumption is low, and the refrigerator compartment 12 and the freezer compartment 10 can be efficiently cooled. The machine fan 8 and the freezer fan 9 are operated, which leads to further energy saving.
[0026]
At this time, as a means for changing the refrigeration capacity of the compressor, a method of reducing the number of rotations of the compressor motor and reducing the number of refrigerant compressions of the piston that moves in conjunction with it reduces the refrigerant circulation amount in the refrigeration cycle, or the freezing chamber throttling device 3 Further, the refrigerator for the refrigerator compartment 6 is a throttle device including at least a part of a switchable throttle device in which a variable throttle valve, an on-off valve, and a capillary tube adapted to several states are combined, and a refrigerant suitable for those states The throttle state may be a flow or pressure difference (for example, the freezing room throttling device 3 or the refrigerating room throttling device 6 is throttling in accordance with the lowering ability of the compressor 1).
[0027]
In FIG. 2, this figure is a schematic view of the check valve 15 serving as the branch valve 5, which has an electromagnetic valve mechanism 15b including a needle 15a for opening and closing the outlet, and has an inlet 15c and two outlets 15d and 15e. I have. In addition, the inlet 15c and the outlet 15d are on the same side, the outlet 15d is disposed above the outlet 15d, and the remaining outlet 15e is positioned lower than the inlet 15c, and the solenoid valve mechanism 15b is energized. Due to the movement of the needle 15a, the outlet 15e can be opened and closed.
[0028]
Further, the inlet 15c of the check valve 15 is connected to the condenser 2, the outlet 15d is connected to the freezing chamber expansion device 3, and the outlet 15e is connected to the refrigerating chamber expansion device 6. When both the freezer compartment 10 and the refrigerator compartment 12 are higher than a set temperature (for example: set temperature: freezer compartment 10 = −18 ° C., refrigerator compartment 12 = 5 ° C.), the freezer compartment temperature sensing device 13 and the refrigerator compartment temperature sensor The device 14 senses the room temperature, and a control device (not shown) energizes the electromagnetic valve mechanism 15b of the check valve 15 to move the needle 15a upward and open the outlet 15e.
[0029]
Then, the compressor 1 is operated, and the refrigerant liquefied by the condenser 2 flows into the chamber 15f from the inlet 15c of the check valve 15, and then flows out from the outlet 15d to evaporate the freezer expansion device 3 and the freezer compartment. Heat is taken from the surrounding air while expanding and drying in the vessel 4, and the refrigerant liquefied in the condenser 2 flows into the chamber 15 f from the inlet 15 c of the check valve 15 and then opened. The refrigerant flows out from the outlet 15e of the valve 15, flows away from the surrounding air while being expanded and dried and vaporized in the refrigerator for the refrigerator compartment 6 and the evaporator for the refrigerator compartment 7, and the refrigerant returns to the compressor 1 in the vaporized state. It becomes.
[0030]
At this time, the refrigerant is separated into gas and liquid in the chamber 15f of the check valve 15, the refrigerant mainly composed of gas refrigerant is present above, and the refrigerant mainly composed of liquid refrigerant is present below. The volume is set.
[0031]
The outlet 15d is located in the refrigerant region mainly composed of the upper gas refrigerant, and the outlet 15e is located in the refrigerant region mainly composed of the lower liquid refrigerant. The refrigerant flowing through the freezer compartment evaporator 4 is mainly composed of a gas refrigerant, and the refrigerant flowing through the refrigerator compartment evaporator 7 through the refrigerator compartment evaporator 7 is mainly composed of liquid refrigerant. The squeezing amount of the refrigerating room squeezing device 6 is reduced to a smaller amount than the squeezing amount of the freezing room squeezing device 3. Even if it is set, a stable refrigerant flow as set can be obtained from the outlet 15d and the outlet 15e to the freezing chamber expansion device 3 and the refrigerating chamber expansion device 6, respectively.
[0032]
In the above, when the refrigerant at the outlet 15d flowing through the freezer expansion device 3 to the freezer evaporator 4 is only a wet gas refrigerant, the cooling capacity is lowered, but the refrigerant flow is stable. When the refrigerant at the outlet 15d flowing through the freezing chamber expansion device 3 to the freezing chamber evaporator 4 is a gas-liquid refrigerant and has a large liquid ratio, the refrigerating capacity is improved. However, the instability of the refrigerant flow increases. When the refrigerant flow becomes unstable, the difference between the amount of restriction of the refrigerating room expansion device 6 and the amount of expansion of the freezing room expansion device 3 may be reduced to stabilize the refrigerant flow. .
[0033]
In addition, when the fluid passing through a predetermined throttle device (for example: capillary tube) is liquid and gas, the fluid resistance when the same volume passes for a predetermined time is that the liquid passes through the throttle device due to the influence of its viscosity. Therefore, when the refrigerant flows through the refrigerating chamber expansion device 6 and the freezing chamber expansion device 3 at the same time, only the refrigerating chamber expansion device 6 is used rather than the liquid refrigerant flowing through both the expansion devices. When the liquid refrigerant flows and the other freezing chamber expansion device 3 flows with gas refrigerant, the combined fluid resistance of the refrigerating chamber expansion device 6 and the freezing chamber expansion device 3 becomes lower.
[0034]
Therefore, compared with the case where the refrigerant mainly composed of liquid refrigerant flows through the refrigerating room expansion apparatus 6 and the freezing room expansion apparatus 3 simultaneously, the refrigerant mainly composed of liquid refrigerant flows only in the refrigerating room expansion apparatus 6, and the other In the freezer compartment throttle device 3, when the refrigerant mainly composed of a gas refrigerant flows, the combined fluid resistance is lower, and the evaporation temperature is balanced to a higher level. As a result, the refrigerant flow in which the evaporation temperature of the refrigerator compartment evaporator 7 is stable. It can be set high while maintaining the state.
[0035]
Further, since the refrigerant mainly composed of liquid refrigerant flows to the refrigerating room expansion device 6 side, the cooling power on the refrigerating room evaporator 7 side can be kept high, and the evaporator capacity on the refrigerating room evaporator 7 side is increased. .
[0036]
Then, the check valve 15 main body is appropriately tilted to adjust the height relationship between the refrigerant surface mainly composed of liquid refrigerant and the outlet 15d, thereby passing through the refrigerator for the refrigerator compartment 6 from the outlet 15e. The refrigerant flowing to the evaporator 7 is a refrigerant mainly composed of liquid refrigerant, and the refrigerant flowing from the outlet 15d to the freezing chamber expansion device 3 can be set to be a refrigerant mainly composed of gas refrigerant. A refrigerating cycle in which the gas-liquid ratio of the flowing refrigerant is appropriately adjusted, and the refrigerants stably flow through the freezer compartment evaporator 4 and the refrigerator compartment evaporator 7 at the same time and maintain the optimum cooling state of each of the evaporators. Is obtained.
[0037]
In addition, what is necessary is just to set the position of each said outlet in the moderate position with respect to the refrigerant | coolant surface which mainly has a liquid refrigerant according to the setting conditions. In this figure, the refrigerant surface mainly composed of liquid refrigerant is at an appropriate position, and the check valve 15 does not need to be inclined, and is an example when the necessary setting conditions are satisfied.
[0038]
Therefore, the check valve 15 is separated into a refrigerant mainly composed of liquid refrigerant and a refrigerant mainly composed of gas refrigerant, and in accordance with cycle setting conditions, each of the plurality of outlets of the branch valve has a refrigerant side mainly composed of liquid refrigerant. If it is located at or near one of the refrigerant sides mainly composed of gas refrigerant, the gas-liquid ratio of the refrigerant flowing through each of them will be adjusted appropriately. A refrigeration cycle will be obtained that maintains the optimum cooling power for each of the flowing evaporators.
[0039]
In addition, it is good to fix the check valve 15 to the refrigerator main body in the adjusted state of the check valve 15 main body as described above.
[0040]
If a common throttle device (not shown) is provided between the condenser 2 and the check valve 15 which is the branch valve 5 and the pressure is reduced to some extent, the refrigerant liquefied in the condenser 2 is The refrigerant passes through a common throttle device to become a gas-liquid refrigerant. In the chamber 15f of the check valve 15, the refrigerant is gas-liquid separated. A refrigerant mainly composed of a gas refrigerant is located above, and a refrigerant mainly composed of a liquid refrigerant is located below. It becomes easier to exist.
[0041]
When the check valve 15 closes the outlet 15e with the needle 15a, a part of the needle 15a is buried in a refrigerant mainly composed of a liquid refrigerant. If the liquid level of the refrigerant mainly composed of the refrigerant rises and the outlet 15d is always covered with the refrigerant mainly composed of the liquid refrigerant during the refrigeration cycle operation, the freezing chamber expansion device 3 always has the liquid refrigerant. Thus, the refrigerant mainly flows out from the outlet 15d, and the evaporator capacity on the freezer compartment evaporator 4 side can always be kept large, and the cooling capacity of the freezer compartment evaporator 4 is improved.
[0042]
Furthermore, even if the inlet 15c is provided in a region other than the region of 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.
[0043]
In FIG. 3, this figure is a schematic view of a three-way valve 16 serving as the branch valve 5, which has an opening / closing valve mechanism 16b including a ball 16a for opening / closing the outlet, and has an inlet 16c and two outlets 16d, 16e. I have. The ball 16a is always subjected to a force that is lifted upward from below by a coil spring (not shown) or the like.
[0044]
Further, the inlet 16c and the outlets 16d, 16e are on the same side, and the on-off valve mechanism 16b rotates in a substantially horizontal direction (the rotation axis is an axis passing through the center in the left-right direction of the three-way valve 16). The ball 16a moves up and down on the outlet 16e, and the outlet 16e is opened and closed by the ball 16a, so that the outlet 16e can be opened and closed.
[0045]
Further, the inlet 16c of the three-way valve 16 is connected to the condenser 2, the outlet 16d is connected to the freezing chamber expansion device 3, and the outlet 16e is connected to the refrigerating chamber expansion device 6. In this figure, 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.
[0046]
When both the freezer compartment 10 and the refrigerator compartment 12 are higher than a set temperature (for example: set temperature: freezer compartment 10 = −18 ° C., refrigerator compartment 12 = 5 ° C.), the freezer compartment temperature sensing device 13 and the refrigerator compartment temperature sensor The device 14 senses the room temperature, and the control device (not shown) rotates the on-off valve mechanism 16b of the three-way valve 16 in a substantially horizontal direction, whereby the ball 16a moves upward, and the outlet 16e is as shown in FIG. Opened.
[0047]
Then, the compressor 1 is operated, and the refrigerant liquefied in the condenser 2 passes through the freezing chamber expansion device 3 from the outlet 16d of the three-way valve 16 and is expanded and dried and vaporized in the freezing chamber evaporator 4. Then, the refrigerant liquefied by the condenser 2 flows from the outlet 16e of the opened three-way valve 16 through the refrigerating room expansion device 6 and is expanded and dried by the refrigerating room evaporator 7. Heat flows away from the surrounding air, and the refrigerant returns to the compressor 1 in a vaporized state.
[0048]
At this time, the refrigerant is separated into gas and liquid in the chamber 16f of the three-way valve 16, and the refrigerant mainly composed of gas refrigerant is present above and the refrigerant mainly composed of liquid refrigerant is present below. The volume is set.
[0049]
The outlet 16d is located in the refrigerant region mainly composed of the upper gas refrigerant, and the outlet 16e is located in the refrigerant region mainly composed of the lower liquid refrigerant. The refrigerant flowing through the freezer compartment evaporator 4 is mainly composed of a gas refrigerant, and the refrigerant flowing through the refrigerator compartment evaporator 7 through the refrigerator compartment evaporator 7 is mainly composed of liquid refrigerant. The squeezing amount of the refrigerating room squeezing device 6 is reduced to a smaller amount than the squeezing amount of the freezing room squeezing device 3. Even if it is set, a stable refrigerant flow as set can be obtained from the outlet 16d and the outlet 16e to the freezing chamber expansion device 3 and the refrigerating chamber expansion device 6, respectively.
[0050]
In addition, when the refrigerant at the outlet 16d flowing through the freezing chamber expansion device 3 to the freezing chamber evaporator 4 is only the wet gas refrigerant, the freezing chamber evaporation is performed through the freezing chamber expansion device 3. When the refrigerant at the outlet 16d flowing into the container 4 is a gas-liquid refrigerant and has a large liquid ratio, or the refrigerant mainly composed of liquid refrigerant flows only in the refrigerating chamber expansion device 6, and the other freezer compartment The characteristics of the throttle device 3 when a refrigerant mainly composed of a gas refrigerant flows are the same as when the check valve is used.
[0051]
Then, the three-way valve 16 main body as shown in FIG. 3 is appropriately inclined to adjust the height relationship between the refrigerant surface mainly composed of liquid refrigerant and the outlet 16d, whereby the freezer compartment expansion device 3 is provided from the outlet 16d. The gas-liquid ratio of the refrigerant mainly composed of the gas refrigerant flowing in the refrigerant is adjusted, and the optimal cooling power state of each of the evaporators in which the refrigerant stably flows through the freezer compartment evaporator 4 and the refrigerator compartment evaporator 7 simultaneously. The refrigeration cycle that keeps the temperature is obtained, and the three-way valve 16 main body is inclined and fixed to the refrigerator main body.
[0052]
If a common throttle device (not shown) is provided between the condenser 2 and the three-way valve 16 serving as the branch valve 5 and the pressure is reduced to some extent, the same as with the check valve 15 in FIG. The refrigerant liquefied in the condenser 2 passes through the common throttle device and becomes a gas-liquid refrigerant. The refrigerant is gas-liquid separated in the chamber 16f of the three-way valve 16, and the refrigerant mainly composed of a gas refrigerant is provided above. However, a refrigerant mainly composed of a liquid refrigerant is more likely to exist below.
[0053]
In addition, if the difference in height between the outlet 16d and the outlet 16e is 1.5 mm or more, the above-mentioned effect due to gas-liquid separation can be obtained sufficiently. The three-way valve 16 as shown in FIG. In the case of a structure in which the positions of the outlet 16d and the outlet 16e are in the horizontal position, specifically, the horizontal interval between the outlet 16d and the outlet 16e is 8.5 mm, and the three-way valve 16 If the three-way valve 16 is inclined so that the rotation axis of the on-off valve mechanism 16b is inclined by 15 °, and the outlet 16e is set to be approximately 2.2 mm lower than the outlet 16d in the vertical direction as shown in FIG. Therefore, the refrigerator can be obtained stably and has high productivity.
[0054]
The same effect can be obtained even if the inlet 16c of the three-way valve 16 is provided on the side, and further, the outlet 16d of the three-way valve 16 can be provided at a position corresponding to the outlet 15d of the check valve 15. The same effect as above can be obtained.
[0055]
Further, the inclination angle of the branch valve 5 such as the check valve 15 or the three-way valve 16 can be set to a fixed value (for example, 12 °, 15 °, 17 °, etc.), so that variations in the refrigeration cycle in mass production can be achieved. High-efficiency refrigerator with more stable cooling state that can be fine-tuned on the cycle by adapting to (combination in combination of throttling device, evaporator, condenser, compressor, refrigerant charge amount, etc.) Is obtained.
[0056]
Further, when a common throttle device (not shown) is provided, if the common throttle device is set to a throttle amount equivalent to a predetermined dedicated throttle device (for example, a refrigerator compartment throttle device), the dedicated throttle device Can be omitted, the refrigeration cycle can be simplified, and workability, quality reliability, and cost are improved.
[0057]
The above is an example of a refrigeration cycle provided with an evaporator for a freezer compartment 4 and an evaporator for a refrigerator compartment 7, but a plurality of other evaporators are provided in the same manner as each of the evaporators. When the respective throttle devices are connected to the outlets of the check valve 15 and the three-way valve 16 which are the branch valves 5 and the outlets satisfying the setting conditions, It is obvious that the same effect as described above can be obtained by changing the gas-liquid mixing ratio of the flow, such that the refrigeration capacity can be changed.
[0058]
【The invention's effect】
Since the refrigerator of the present invention is configured as described above, according to the present invention, when a refrigerator compartment, a freezer compartment, etc. are provided, the refrigerator compartment, the freezer compartment, and the other storage compartments are optimal according to their load fluctuations. A cooling effect is obtained, and a refrigerator having a highly efficient refrigeration cycle with little energy loss is obtained. Moreover, it is possible to obtain a refrigeration cycle capable of stably flowing refrigerant simultaneously to a plurality of evaporators such as a freezer evaporator and a refrigerator refrigerator and maintaining the optimum cooling power state of each evaporator. .
[Brief description of the drawings]
FIG. 1 is an explanatory block diagram of a refrigerator according to the present invention.
FIG. 2 is an explanatory diagram of a check valve of the refrigerator of the present invention.
FIG. 3 is an explanatory diagram of a three-way valve of the refrigerator of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Compressor 2 Condenser 3 Freezer compartment throttle device 4 Freezer compartment evaporator 5 Branch valve 6 Refrigerator compartment throttle device 7 Refrigerator compartment evaporator 10 Freezer compartment 12 Refrigerator compartment 15 Check valve 15a Needle 15d Exit (open outlet)
15e Exit (open / close exit)
16 Three-way valve 16d Outlet 16e Outlet

Claims (3)

A refrigerating room, a freezing room, a refrigerant flow path through which a refrigerant flows, a compressor that operates a refrigeration cycle by the circulation of the refrigerant, a condenser connected to a discharge side of the compressor, and a discharge side of the condenser And an evaporator for a refrigerating chamber that is arranged between the suction side of the compressor and that generates cold air that flows only into the refrigerating chamber among the refrigerating chamber and the freezing chamber, the discharge side of the condenser, and the A freezer compartment evaporator that is arranged in parallel with the refrigerating compartment evaporator between the suction sides of the compressor and that generates cold air that flows only into the freezer compartment within the refrigerating compartment and the freezer compartment, and A first throttle device provided corresponding to the refrigerator for the refrigerator compartment, a second throttle device provided corresponding to the evaporator for the freezer compartment, and the refrigerant flow path branched on the discharge side of the condenser A branch valve arranged at the branch point,
The branch valve is provided on the bottom surface of the chamber and connected to the first throttling device, a needle that opens and closes the first outlet portion, and an inlet portion that is provided on a side surface of the chamber and into which the refrigerant flows. When the first outlet portion is closed by the needle and is provided on the side surface of the chamber, the liquid surface is always covered by the liquid refrigerant whose liquid level has risen due to part of the needle being buried in the liquid refrigerant. A second outlet portion disposed above the liquid level of the liquid refrigerant that descends when the outlet portion is opened, and the first outlet portion is opened to evaporate the refrigerator compartment and the freezer compartment. Switching between a state in which the refrigerant is supplied to the refrigerator and a state in which the first outlet is closed and the refrigerant is supplied only to the freezer evaporator,
When the refrigerant is supplied from the branch valve to the refrigerator for the refrigerator compartment and the evaporator for the freezer compartment, the refrigerant sent out to the first throttling device is mainly liquid refrigerant and the refrigerant sent out to the second throttling device is mainly gas refrigerant. And a decompression amount of the first throttling device smaller than that of the second throttling device . The refrigerator according to claim 1 , wherein a third expansion device is provided between the condenser and the branch valve . The refrigerator according to claim 2, wherein the third diaphragm device also serves as the first diaphragm device or the second diaphragm device .

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