JP4575217B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator having two evaporating means in a refrigeration cycle, and relates to a refrigerator capable of adjusting the throttle amount of the refrigerant in accordance with the refrigerant flow path in the refrigeration cycle.

In recent years, for example, as described in Patent Document 1, a refrigerator having a refrigerator compartment and a freezer compartment and having two evaporators for performing heat exchange (hereinafter referred to as cooling) is used. ing.
FIG. 1 is a schematic configuration diagram of a conventional refrigerator provided with such two evaporation means. The conventional refrigerator will be described below with reference to FIG.
As shown in FIG. 1, the refrigerator B in the conventional example includes a refrigerator compartment 1, a freezer compartment 2, a refrigerator thermometer 3, a freezer thermometer 4, a control device 5, a refrigerator refrigerator 6, and a freezer compartment. It consists of a blower 7 and a refrigeration cycle β.
The refrigerating room 1 and the freezing room 2 are storage rooms for storing objects to be cooled such as food at temperatures above and below the freezing point, and are separated by partition walls so that no cold air mixing occurs between them. The temperatures of the refrigerator compartment 1 and the freezer compartment 2 are detected by the refrigerator compartment thermometer 3 and the refrigerator compartment thermometer 4, respectively. The detected temperature is input to the control device 5.
The control device 5 has a calculation unit such as an MPU, and a storage unit such as a ROM and a RAM. By executing a control program stored in the ROM, the refrigerator thermometer 3 and the freezer compartment The refrigeration cycle β is controlled based on the temperature detected by the thermometer 4.

Hereinafter, control of the refrigeration cycle β by the control device 5 will be described. The refrigeration cycle β is compressed by a compressor 8 that compresses the refrigerant into a high-temperature and high-pressure gas in a refrigerant path filled with a flammable refrigerant to cope with non-fluorocarbons. The refrigerant 9 that condenses into gaseous liquid at medium temperature and medium pressure by releasing heat from the gaseous refrigerant, the dryer 10 that removes moisture from the refrigerant liquefied by the condenser 9, and the dryer 10 are passed through. Capillary tube 11 (capillary tube) that depressurizes the refrigerant to an easily evaporable state, evaporator 12 for the freezer compartment that evaporates the refrigerant after the decompression into a gaseous state, and exchanges heat with the surrounding air, evaporator for the refrigerator compartment 13. The air cooled by the freezer compartment evaporator 12 is forcibly blown by the freezer compartment blower 7, and the air cooled by the refrigerator compartment evaporator 13 is forcibly blown by the refrigerator compartment fan 6, respectively. The temperature of the refrigerator compartment 1 and the freezer compartment 2 is lowered.
When the temperature detected by the freezer thermometer 4 (hereinafter referred to as the freezing temperature) is higher than the freezing set temperature set in the control device 5 (the freezing room 2 is not sufficiently cooled), the control is performed. The operation of the compressor 8 is controlled by the device 5. Furthermore, when the temperature detected by the refrigerating room thermometer 3 (hereinafter referred to as refrigerating temperature) is higher than the refrigerating set temperature set in the control device 5 (the refrigerating room 1 is not sufficiently cooled). Thus, only the refrigerator compartment fan 6 is controlled by the control device 5 so that only the refrigerator compartment 1 is selectively cooled. On the other hand, when the refrigeration temperature is lower than the refrigeration set temperature, only the freezer compartment blower 7 is controlled by the control device 5 so that only the freezer compartment 2 is selectively cooled. .
When the freezing temperature is lower than the freezing set temperature (the freezer compartment 2 is cooled more than necessary), the compressor 8, the refrigerator compartment fan 6, and the freezer compartment fan 7 are operated. Is stopped.
The refrigeration set temperature and the refrigeration set temperature are variable by an operation input from an input unit (not shown).
Japanese Patent Application Laid-Open No. 8-210553 Japanese Patent Laid-Open No. 7-110184

In the above-described embodiment, the freezer compartment evaporator 12 and the refrigerator compartment evaporator 13 are only connected by piping, and therefore the pressure of the refrigerant flowing into each of them is substantially equal. Accordingly, the evaporating temperatures when the refrigerant is evaporated by the freezer evaporator 12 and the freezer evaporator 13 are substantially equal. 6, must be done by adjusting the operating time by the freezer blower 7.
By the way, the evaporation temperature of the refrigerant is suitable for the freezer compartment 2 that requires a lower temperature, and therefore the difference between the appropriate temperature of the refrigerator compartment 1 and the evaporation temperature is inevitably large. . However, in such a large temperature difference state, it is difficult to keep the temperature of the refrigerator compartment 1 around the appropriate temperature only by controlling the operation time of the refrigerator refrigerator 6. In other words, there is a problem in that excessive cooling that goes far beyond the optimum temperature is likely to occur during cooling, cooling efficiency is reduced, and power is consumed wastefully.
Moreover, there is a problem that the quality of the food is deteriorated, for example, due to excessive cooling, temperature stress acts on the stored food (example of stored items) and drying is promoted.
Accordingly, the present invention has been made in view of the above circumstances, and the object of the present invention is to obtain an evaporating temperature suitable for cooling of the refrigerator compartment and an evaporating temperature suitable for cooling of the freezer compartment, thereby improving the cooling efficiency. An object of the present invention is to provide a refrigerator that is expensive and can prevent deterioration in the quality of the contents.

In order to achieve the above object, the present invention is connected to a low-temperature chamber that is connected in series in the refrigerant path and exchanges heat with the room air of the low-temperature chamber, and is connected to the upstream side of the low-temperature chamber in the refrigerant path. Two evaporating means 12 , 13 for the high temperature chamber having a high set temperature and exchanging heat with the indoor air of the high temperature chamber ;
A bypass path X connected to the refrigerant path , bypassing the evaporating means 13 for the upstream high temperature chamber and allowing the refrigerant to flow into the evaporating means 12 for the low temperature chamber ;
Flow path switching means 14 for switching the flow path of the refrigerant at a branching portion of the refrigerant path to the bypass path X ;
A fixed throttle means 11 provided in the refrigerant passage upstream of the front Symbol bifurcation,
A refrigeration cycle with
Of the freezing cycle, the downstream side of the branch portion is the above flow direction switching means in said bypass path X of the refrigerant passage downstream of 14, the side where refrigerant flows into said evaporator means 12 for cold room The variable throttle means 15 is provided only in the refrigerator.
Thereby, the throttle amount of the refrigerant is adjusted according to the evaporator into which the refrigerant flows (in other words, the chamber to be cooled), so that an appropriate throttle amount (evaporation) according to the refrigerant flow condition is adjusted. Temperature).
For example, in a situation where both the refrigerator compartment and the freezer compartment are not sufficiently cooled, the refrigerant path is switched so that the refrigerant flows into the evaporator for cooling the refrigerator compartment and the evaporator for cooling the freezer compartment, respectively. The amount of squeezing is adjusted so that the evaporation temperature becomes a temperature suitable for cooling the refrigerator compartment. As a result, when only the refrigerator compartment is sufficiently cooled, the refrigerant path is switched so that the refrigerant flows only into the freezer cooling evaporator, and the throttle amount is set to the evaporating temperature of the refrigerant. Control such as a temperature suitable for cooling is possible.
Further, a case where a refrigeration cycle in which the two evaporators are connected in parallel is used in the refrigerant path is conceivable. In this case, the same effect can be obtained.

As for the variable throttle section, it is sufficient for the purpose of the present invention if the throttle amount of the refrigerant flowing into one of the evaporators is variable. That is, in a normal refrigerator, the refrigerant is depressurized (squeezed) to a certain pressure by a capillary tube or the like, so that the refrigerant at that pressure is used for cooling (heat exchange) of a refrigerator room or the like having a high cooling temperature, and the variable throttle unit The refrigerant further reduced in pressure by the above may be used for cooling the freezing chamber and cooling during ice making. Of course, an example in which the throttle amount of the refrigerant flowing into both the evaporators is variable is also conceivable.
By the way, normally, when the refrigerant flows into one evaporator, the cooling efficiency is lower than when the refrigerant flows into both evaporators. Therefore, when the refrigerant is caused to flow through the one evaporator, if the refrigerant is controlled so that the throttle amount is increased, the evaporating temperature of the refrigerant is lowered, thereby reducing the cooling efficiency. It is possible to prevent.
Further, if the variable throttle part further depressurizes the refrigerant, the refrigerant path is switched so that the depressurized refrigerant flows into the freezer cooling evaporator or the ice making evaporator. Conceivable. On the other hand, if the variable throttle part further pressurizes the refrigerant (lowers the throttle), it is considered that the refrigerant throttled by the throttle part is used for cooling the refrigerator with a high set temperature.

Further, it is conceivable that the flow path is switched based on the detected temperature of the refrigerator compartment, the detected temperature of the freezer compartment, and the like. For example, it is conceivable to perform control so that the refrigerant flows through the refrigerator for cooling the refrigerator only when the detected temperature of the refrigerator is higher than a set temperature.
It is easy to use a three-way valve for switching the flow path, and the variable throttle part uses the throttle amount adjustment function provided by the three-way valve, etc., when the three-way valve and variable throttle valve are provided independently. On the other hand, it is advantageous in terms of cost.
By the way, since the refrigerant becomes easier to exchange heat as the pressure is greatly reduced, in order to prevent extra heat exchange other than the evaporator as much as possible, the refrigerant having a higher throttle amount (depressurized) flows in. It is desirable to keep the distance between the evaporator and the branch portion as short as possible.
Furthermore, in the present invention , the throttle amount is upstream of the three-way valve (branch part) in the refrigerant flow direction, specifically between the branch part and the condenser 9 for condensing the refrigerant (see FIGS. 2 and 3). A fixed throttle means such as a fixed capillary tube (capillary tube) is provided . Usually, the condenser is provided outside the refrigerator main body, and the path from the condenser to the branch portion in the refrigerant path is relatively long. Therefore, by connecting the condenser and the branching portion with the capillary tube (capillary tube), it is possible to reduce the amount of metal for forming the refrigerant path, and it is possible to reduce the cost. Even when the variable throttle is out of order, the refrigerant can be depressurized for the time being, so that it is possible to avoid a situation in which the contents cannot be cooled.
By the way, a technique for improving the cooling capacity by soldering the pipe connecting the evaporator and the compressor and the capillary tube (capillary tube) so as to exchange heat between them has been widely used. Yes. The present invention may be a further application of such a conventional technique.
When such soldering is applied, it is more desirable to provide the capillary tube (capillary tube) between the evaporator and the three-way valve (see the refrigeration cycle in FIGS. 2 and 3). This is because, conversely, when a three-way valve having a throttle amount adjusting function is provided between the condenser and the capillary tube, the refrigerant expands in the three-way valve and the temperature decreases. Therefore, the temperature difference between the piping connecting the evaporator and the compressor and the expanded refrigerant is reduced, and the amount of heat exchange caused by soldering is reduced (the significance of soldering is halved). That is, in the case where a capillary tube (capillary tube) is provided between the condenser and the three-way valve (flow path branching portion) having the throttle amount adjusting function, the refrigerant does not expand. This is because it is possible to cause heat exchange by soldering (in a state where the temperature difference is high), and heat exchange is effectively performed between the capillary tube (capillary tube) and the soldered pipe in the three-way valve.

  According to the present invention, among the evaporators provided in series or in parallel, the throttle amount of the refrigerant is adjusted according to the evaporator into which the refrigerant flows (in other words, the chamber to be cooled). It is possible to obtain an appropriate throttle amount (evaporation temperature) according to the flow path state of the refrigerant, to have high cooling efficiency, and to prevent deterioration in the quality of the contents.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
Here, FIG. 1 is a schematic configuration diagram of a refrigerator in a conventional example, FIG. 2 is a schematic configuration diagram of a refrigerator according to the first embodiment of the present invention, and FIG. 3 is an overview of the refrigerator according to the second embodiment of the present invention. FIG. 4 is a configuration diagram, FIG. 4 is a flowchart showing a control procedure of a refrigeration cycle executed by the control device included in the refrigerator according to the first embodiment of the present invention, and FIG. 5 is included in the refrigerator according to the first embodiment of the present invention. It is a graph showing the timing of control of each part by a control apparatus.

(1) About the outline of refrigerator A1 which concerns on the 1st Embodiment of this invention.
Hereinafter, the refrigerator according to the first embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 2, the refrigerator A1 according to the first embodiment of the present invention includes a refrigerator compartment 1, a freezer compartment 2, a refrigerator thermometer 3, a freezer thermometer 4, a control device 5, and a refrigerator compartment. The refrigeration cycle α1 and the control device 5 control the refrigeration cycle α1 and each part, which is different from the conventional example.
Hereinafter, the refrigeration cycle α1 will be described in detail. In the refrigeration cycle α1, a compressor 8, a condenser 9, a dryer 10, and a capillary tube 11 are provided in series in a refrigerant path filled with a combustible refrigerant in order to cope with non-fluorocarbons. A branch section S that branches the refrigerant path is formed downstream of the capillary tube 11 (an example of a fixed throttle means in which the throttle amount of the refrigerant is fixed) in the flow direction of the refrigerant, and a three-way valve 14 is formed in the branch section S. (That is, the capillary tube 11 is provided on the upstream side of the branch portion S). The three-way valve 14 increases the throttle amount of the refrigerant flowing into one side of the refrigerant path after branching (decompresses the refrigerant) and is integrated with a variable throttle 15 whose throttle amount is variable. is there. That is, it has a diaphragm amount changing function. Switching of the flow path of the refrigerant by the three-way valve 14 (an example of part of the flow path switching means) is performed by the control device 5 (an example of the flow path switching control means) of the temperature of the refrigerating chamber 1 (for the refrigerating room). While referring to the temperature detected by the freezer compartment thermometer 4 for detecting the temperature of the freezer compartment 3 for detecting the cooling temperature by the evaporation means) and the temperature of the freezer compartment 2 (cooling temperature by the evaporator means for freezer). This will be described later. The refrigerating room thermometer 3 and the freezing room thermometer 4 are examples of temperature detecting means.

(2) About the characteristic of refrigerating cycle (alpha) 1 which refrigerator A1 which concerns on the 1st Embodiment of this invention has.
On the downstream side of the three-way valve 14, the refrigerant is evaporated to form a gas and exchanges heat with the air in the refrigerator compartment 1 (cools the refrigerator compartment 1), the refrigerator compartment evaporator 13, and the freezer compartment 2. Freezer compartment evaporators 12 that exchange heat with the air inside (cool the freezer compartment 2) are arranged in series in that order. Further, one side of the three-way valve 14 is connected to the refrigerator compartment evaporator 13 and the other side provided with the variable throttle 15 is connected to the freezer compartment evaporator 12, that is, the refrigerant path is connected to the refrigerant path. A bypass path X is provided to bypass the refrigerator 13 for refrigerator compartment (an example of the upstream evaporation means). As will be described in detail later, the three-way valve 14 switches the flow path of the refrigerant in the branch portion S of the bypass path X in the refrigerant path based on the control of the control device 5. The three-way valve 14 and the control device 5 are examples of flow path switching means.
The variable throttle 15 is connected to the freezer compartment evaporator 12 (an example of one evaporator) between the freezer compartment evaporator 12 (an example of one evaporator) and the branch portion S. The throttle amount of the refrigerant flowing in can be increased (that is, the refrigerant is further depressurized) than the throttle amount of the refrigerant flowing into the refrigerator 13 for the refrigerator compartment. The refrigerant that has been squeezed more (highly depressurized) is likely to perform heat exchange. Accordingly, in order to prevent such refrigerant from excessive heat exchange in the bypass path X, the distance of the bypass path X (the distance between the branch portion S in the refrigerant path and the freezer compartment evaporator 12) is The distance between the branch portion S in the refrigerant path and the evaporator 13 for the refrigerator compartment is set to be shorter.
The piping between the freezer compartment evaporator 12 and the compressor 8 and the capillary tube 11 are soldered with lead-free solder so as to be in thermal contact with each other.

(3) About switching the flow path and adjusting the amount of restriction.
FIG. 4 is a flowchart showing a control procedure of the refrigeration cycle α1 and each part, which is executed by the control device 5 of the refrigerator A1 according to the embodiment of the present invention. Hereinafter, the control of the refrigeration cycle α1 by the control device 5 will be described in detail with reference to FIG. S1, S2,... Shown in the flowchart of FIG. 4 are numbers representing processing steps (steps), and when the control device 5 executes a control program stored in a ROM (not shown), The process starts from step S1 at the start of energization.
In step S1, the control device 5 detects the temperature (refrigeration temperature) Rth of the refrigerating chamber 1 detected by the refrigerating chamber thermometer 3, and the detection of the freezing chamber 2 detected by the freezing chamber thermometer 4. With reference to the temperature (refrigeration temperature) Fth, it is determined whether or not they are higher than the preset cold room cooling start temperature Ron and freezing room cooling start temperature Fon. If it is determined that both the refrigeration temperature Rth and the refrigeration temperature Fth are high (S1 YES), the process proceeds to step S2. On the other hand, while it is determined that the refrigerating temperature Rth is low (S1 NO), the process in the step is repeated.

In step S2, the control device 5 controls the three-way valve 14 to fully open both the refrigerator compartment evaporator 13 and the freezer compartment evaporator 12 side paths.
In step S3 following step S2, the control device 5 controls the operation of the compressor 8, the refrigerator compartment fan 6, and the freezer compartment fan 7, respectively.
In step S4 following step S3, the control device 5 controls the variable throttle 15 to reduce the throttle amount in the bypass path X. That is, the refrigerant is not decompressed by the variable throttle 15. The amount of decompression by the capillary tube 11 is such that the evaporating temperature of the refrigerant is an appropriate temperature of the refrigerating chamber 1 (an intermediate temperature between the refrigerating chamber cooling start temperature Ron and a refrigerating chamber cooling stop temperature Roff described later). It is adjusted to be suitable for the target temperature. Therefore, in this state, it is possible to appropriately cool the refrigerator compartment 1 without overcooling or the like.

In step S5 subsequent to step S4, the control device 5 refers to the temperature (refrigeration temperature) Rth detected in the refrigerator compartment 1 detected by the refrigerator thermometer 3, and is set in the refrigerator compartment cooling stop temperature set in advance. It is determined whether or not it is smaller than Roff, that is, whether or not the refrigerator compartment 1 is sufficiently cooled. If it is determined that the value is small (S5 YES), the process proceeds to step S6. On the other hand, if it is determined that the value is large (S5 NO), the process of the step is repeated.
In step S6, since it is determined in step S5 that the refrigerating chamber 1 has been sufficiently cooled, the control device 5 is configured to stop the flow of the refrigerant into the refrigerating chamber 1 (the refrigerating chamber evaporator 13). The three-way valve 14 is controlled to shut off the path on the refrigerator compartment evaporator 13 side.
In step S7 following step S6, the control device 5 stops the operation of the refrigerator compartment fan 6.
In step S8 following step S7, the control device 5 controls the variable throttle 15 to increase the throttle amount of the refrigerant flowing into the bypass path X. As a result, the refrigerant is depressurized to a lower pressure, and the evaporation temperature is lowered. That is, since it is no longer necessary to cool the refrigerating chamber 1, the refrigerant is supplied only to the freezer compartment evaporator 12 while lowering the evaporation temperature of the refrigerant to an appropriate temperature for cooling the freezer compartment 2. The refrigerant path is adjusted to flow in.
As described above, the control device 5 controls the variable throttle 15 according to the switching of the refrigerant path (step S2, step S6) by the three-way valve 14 (an example of the refrigerant path switching means). The throttle amount of the refrigerant flowing into the bypass path X is changed. The control device 5 and the variable diaphragm 15 are examples of variable diaphragm means. Further, the control device 5 controls the variable restrictor 15 so that the refrigerant flows into both the refrigerator compartment evaporator 13 and the freezer compartment evaporator 12 (both in the branch section S). The amount of restriction of the refrigerant is increased when the refrigerant flows into the freezer compartment evaporator 12 (one branch destination) rather than the branch destination).

In step S9 following step S8, the detected temperature (freezing temperature) Fth of the freezer compartment 2 detected by the freezer compartment thermometer 4 is referred to, which is higher than the preset freezer compartment cooling stop temperature Roff. It is determined whether or not it is small, that is, whether or not the freezer compartment 2 is sufficiently cooled. If it is determined that the value is small (S9 YES), the process proceeds to S10. On the other hand, if it is determined that the value is large (S9 NO), the process in this step is repeated.
In step S10, the control device 5 refers to the detected temperature (refrigeration temperature) Rth of the refrigerator compartment 1 detected by the refrigerator compartment thermometer 3, and determines whether or not it is lower than the refrigerator compartment cooling start temperature Ron. That is, it is determined whether or not the temperature of the refrigerating chamber 1 has risen again to a temperature that requires cooling while the freezing chamber 2 is being intensively cooled. If it is determined that it has risen (NO in S10), the process proceeds to step S2. On the other hand, if it is determined that it has not risen (S10 YES), the process proceeds to step S11.
In step S11, since it was determined that the freezer compartment 2 was sufficiently cooled in step S9, the control device 5 is configured to pause the flow of the refrigerant into the freezer compartment 2 (the freezer compartment evaporator 12). The three-way valve 14 is controlled to cut off the path on the evaporator 12 side of the freezer compartment. As a result, the refrigerant does not flow out from the three-way valve 14 to either the refrigerator compartment evaporator 13 side or the freezer compartment evaporator 12 side (bypass path X side).
In step S12 following step S11, the control device 5 stops the operation of the freezer compartment fan 7 and the compressor 8. When step S12 ends, the process returns to step S1, and the processes of steps S1 to S12 are repeated as appropriate.

(4) About control timing of each part.
FIG. 5 shows a graph representing the timing of control of each part based on the processing result of the flowchart shown in FIG. Note that the state in which the refrigerant throttle amount is increased is shown in FIG. 5 as the “half-open” state of the three-way valve.
As shown in FIG. 5, the three-way valve 14 is controlled to open before a predetermined time of operation of the compressor 8. This prevents a pressure difference from occurring in each part of the refrigerant path and stabilizes the compressor 8 at the start of operation.
Further, as shown in FIG. 5, the refrigerant path is controlled so that the refrigerant flows into both the freezer compartment evaporator 12 and the refrigerator compartment evaporator 13 immediately after the start of operation of the compressor 8. Is done. Thereafter, when the temperature of the refrigerating chamber 1 is sufficiently lowered, the three-way valve 14 is controlled to prevent the refrigerant from flowing into the refrigerating chamber evaporator 13. At the same time, the variable throttle 15 is controlled to adjust the throttle amount of the refrigerant.
Thus, according to this embodiment, the evaporation temperature of the refrigerant is suitable for cooling both the refrigerator compartment 1 and the freezer compartment 2 and for cooling only the freezer compartment 2 according to the refrigerant path. The temperature is adjusted appropriately. Thereby, for example, the inefficiency of cooling the refrigerator compartment 1 at an evaporating temperature close to an appropriate temperature of the freezer compartment 2 can be avoided, and it is possible to prevent deterioration of the quality of the contents caused by supercooling.

(5) About refrigerator A2 which concerns on 2nd Embodiment.
In the refrigerator A1 according to the first embodiment described above, the refrigerator compartment evaporator 13 and the refrigerator compartment evaporator 12 are connected in series, but the present invention is not limited to this. That is, as shown in FIG. 3, a refrigerator A2 having a refrigeration cycle α2 in which the refrigerator 13 evaporator and the evaporator 12 are provided in parallel in the refrigerant path is also conceivable.
The operation of each part is the same also in the refrigerator A2 according to the second embodiment of the present invention, and according to the control of the flowchart shown in FIG. 4, according to the refrigerant path switched by the three-way valve 14. Thus, the evaporating temperature of the refrigerant is appropriately adjusted to a temperature suitable for cooling both the refrigerator compartment 1 and the freezer compartment 2 and for cooling only the freezer compartment 2.

In the above-described embodiment, the variable throttle 15 integrated with the three-way valve 14 changes the refrigerant throttle amount only in accordance with the refrigerant path (the refrigerant into which the refrigerant flows). It is also conceivable to add other conditions as conditions for changing the aperture amount.
For example, when the rotational speed of the compressor 8 (see FIGS. 1 to 3) for compressing the refrigerant is variable, it is conceivable to control the variable throttle 15 according to the rotational speed. That is, when the rotational speed is high, the refrigerant is compressed to a higher pressure, so the throttle amount is decreased to reduce the degree of decompression. Conversely, when the rotational speed is small, the throttle amount is reduced. Control such as enlarging is performed. It is also conceivable to control the variable throttle 15 based on the condensation temperature of the condenser 9 that condenses the refrigerant.
In these cases, the throttle amount of the refrigerant flowing into both the refrigerator compartment evaporator 13 for cooling the refrigerator compartment 1 and the refrigerator compartment evaporator 12 for cooling the freezer compartment 2 is adjusted. Therefore, it is desirable to provide the variable throttle 15 in the refrigerant inflow path to both evaporators.
Further, when ice making is performed, the throttle amount of the refrigerant flowing into the evaporator (the freezer compartment evaporator 12 in the examples of FIGS. 2 and 3) in which the variable throttle 15 performs heat exchange for ice making is set. Further control can be considered. That is, the control device 5 (see FIGS. 2 and 3) controls the variable restrictor 15 when the operation input requesting ice making is made from the operation unit provided on the outer surface of the refrigerator, so that The throttle amount of the refrigerant flowing into the evaporator for heat exchange for ice making is increased until an evaporation temperature suitable for ice making is obtained. Thereby, ice making can be performed without affecting the evaporation temperature of the refrigerant flowing into the other evaporator.

In the above-described embodiment, the example in which the capillary tube 11 (capillary tube) that is a fixed-type throttle means is provided on the upstream side of the three-way valve is disclosed, but the present invention is not limited to this. Instead, a variable diaphragm may be provided. In addition, an example in which the position where the capillary tube 11 is provided is changed between the three-way valve upstream of the three-way valve and the refrigerator 13 for the refrigerator compartment is also conceivable.
Further, in the above-described embodiment, the variable restrictor 15 increases (decreases) the amount of the refrigerant, but conversely reduces the amount of the refrigerant (pressurizes the refrigerant). There are some cases. In that case, the variable throttle is provided between the branch portion S and the evaporator 13 for the refrigerator compartment. In the capillary tube 11, the throttle amount of the refrigerant is adjusted so that the evaporation temperature of the refrigerant becomes a temperature suitable for cooling the freezer compartment 2.
In addition, various modifications can be adopted without departing from the gist of the present invention.

The schematic block diagram of the refrigerator in a prior art example. The schematic block diagram of the refrigerator which concerns on the 1st Embodiment of this invention. The schematic block diagram of the refrigerator which concerns on the 2nd Embodiment of this invention. The flowchart which shows the control procedure of the refrigerating cycle performed by the control apparatus which the refrigerator which concerns on the 1st Embodiment of this invention has. The graph showing the timing of control of each part by the control apparatus which the refrigerator which concerns on the 1st Embodiment of this invention has.

Explanation of symbols

A1 ... refrigerator A2 according to the first embodiment of the present invention ... refrigerator B according to the second embodiment of the present invention ... refrigerator α1 in the conventional example ... refrigeration cycle α2 used in the refrigerator A1 ... used in the refrigerator A2 Refrigeration cycle β ... refrigeration cycle S used in refrigerator B ... branch 1 ... refrigerator compartment 2 ... refrigerator compartment 3 ... refrigerator compartment thermometer 4 ... refrigerator compartment thermometer 5 ... controller 6 ... refrigerator compartment Blower 7 ... Freezer compartment blower 8 ... Compressor 9 ... Condenser 10 ... Dryer 11 ... Capillary tube 12 ... Freezer compartment evaporator 13 ... Refrigerating compartment evaporator 14 ... Three-way valve 15 ... Variable throttle

Claims (5)

Connected in series in the refrigerant path for the cold room that exchanges heat with the room air in the cold room and connected to the upstream side in the refrigerant path of the cold room, the set temperature is higher than the low temperature room, and the room air and heat in the high temperature room Two evaporation means 12 , 13 for the hot chamber to be replaced ;
A bypass path X connected to the refrigerant path , bypassing the evaporating means 13 for the upstream high temperature chamber and allowing the refrigerant to flow into the evaporating means 12 for the low temperature chamber ;
Flow path switching means 14 for switching the flow path of the refrigerant at a branching portion of the refrigerant path to the bypass path X ;
A fixed throttle means 11 provided in the refrigerant passage upstream of the front Symbol bifurcation,
A refrigeration cycle with
Of the freezing cycle, the downstream side of the branch portion is the above flow direction switching means in said bypass path X of the refrigerant passage downstream of 14, the side where refrigerant flows into said evaporator means 12 for cold room The refrigerator is characterized in that the variable throttle means 15 is provided only in the refrigerator. Two evaporating means 12 and 13 are provided for a low temperature chamber that is connected in parallel in the refrigerant path and exchanges heat with the room air of the low temperature chamber and for a high temperature chamber that has a higher set temperature than the low temperature chamber and exchanges heat with the room air of the high temperature chamber A refrigerator equipped with a freezing cycle,
Flow path switching means 14 for switching the flow path of the refrigerant at a branching portion to the two evaporation means in the refrigerant path;
A variable throttle means 15 provided on the downstream side of the refrigerant path of the flow path switching means 14 and on the side where the refrigerant flows into the evaporation means 12 for the low temperature chamber, and variably adjusts the throttle amount of the refrigerant;
A fixed throttling means 11 provided on the upstream side of the refrigerant path of the branch portion;
The refrigerator characterized by comprising.   As a result of changing the throttle amount by the variable throttle means, the distance in the refrigerant path between the low temperature chamber evaporating means and the branch portion into which the refrigerant with a high throttle amount flows is equal to the high temperature chamber evaporating means and the branch. The refrigerator in any one of Claim 1 or 2 set shorter than the distance in the said refrigerant | coolant path | route with a part.   The refrigerator according to any one of claims 1 to 3, wherein the amount of decompression by the fixed throttle means is set to an amount of decompression so that a refrigerant evaporating temperature can obtain a target temperature of the high temperature chamber evaporating means. The throttle amount of the refrigerant is increased in the case where the refrigerant is flowed to one branch destination than in the case where the variable throttle means causes the flow path switching means to flow the refrigerant to both branch destinations. And
One of the two evaporation means is a freezing room evaporation means used for freezing room cooling, the other is a refrigerating room evaporation means used for refrigerating room cooling,
The refrigerator according to any one of claims 1 to 4, wherein a refrigerant with a high throttle amount is determined to flow into the freezer compartment evaporator as a result of changing the throttle amount by the variable throttle means.

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