TWI444580B - Refrigerator - Google Patents

Description

refrigerator

Embodiments of the invention relate to a refrigerator.

Heretofore, there has been proposed a refrigerator having a refrigeration cycle of the following structure as a refrigeration cycle, that is, in the order of a compressor, a condenser, and a three-way valve, in three directions An evaporator for refrigerating is connected to the refrigerating side outlet of the valve, and a refrigerating evaporator is connected to the outlet of the freezing side.

In the refrigerator, by controlling the three-way valve, it is possible to realize a refrigerating and cooling mode in which the coolant flows through the refrigerating evaporator and a refrigerating and cooling mode in which the coolant flows through the refrigerating evaporator.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2003-14357

However, there is a problem that when the three-way valve in the above-described refrigerating cycle is narrowed and adjusted, there is a possibility that the outlet of the three-way valve is blocked due to excessive narrowing or foreign matter such as copper powder.

Accordingly, the present invention has been made in view of the above problems, and provides a refrigerator capable of preventing clogging of a three-way valve.

A refrigerator according to an embodiment of the present invention has a refrigeration cycle of the following structure as a refrigeration cycle, that is, in the order of a compressor, a condenser, a three-way valve having a narrowing function, in the three-way valve a refrigerating evaporator is connected to the refrigerating-side outlet, and a freezing evaporator is connected to the freezing-side outlet, and the refrigerating evaporator and the freezing evaporator are connected to the compressor, and the refrigerator has a control unit. The control unit executes a refrigerating cooling mode or a refrigerating and cooling mode that is conveyed to the refrigerating evaporator in a state where only the refrigerating-side outlet of the three-way valve is fully opened or narrowed. a coolant in which the coolant is delivered to the freezing evaporator in a state where only the freezing side outlet of the three-way valve is fully opened or narrowed, in the chilled cooling mode, the refrigerator The control unit is configured to narrow an outlet of the three-way valve corresponding to any one of the refrigerating cooling mode or the refrigerating cooling mode After performing the one cooling mode, when transitioning to another cooling mode, after the one outlet of the three-way valve is set to a predetermined time full state from the narrowed state, the transition to the other cooling mode is performed. .

Thereby, the foreign matter caught in the outlet of the three-way valve can be eliminated. Therefore, even if the outlet is in the fully closed state, the outlet can be reliably closed, and the refrigerator in which the coolant does not leak can be provided.

Hereinafter, the refrigerator of the present invention will be described with reference to the drawings.

[Example 1]

The refrigerator 1 of Example 1 of the present invention will be described with reference to Figs. 1 to 9 .

(1) Structure of the refrigerator 1

The structure of the refrigerator 1 will be described based on Fig. 1 .

As shown in Fig. 1, a cabinet 100 of the refrigerator 1 of the present example has a storage space formed inside the heat insulating box, and is divided into a freezing area by a horizontal insulating partition wall (hereinafter, referred to as " a plurality of storage rooms such as an F zone ") 2 and a refrigerating zone (hereinafter referred to as "R zone") 3, the freezing zone 2 having a freezing compartment 201 as a storage compartment, an ice making compartment 202, and a small freezing compartment, The refrigerating section 3 has a refrigerating compartment 301 and a vegetable compartment 302. Further, the small freezer compartment is disposed in the lateral direction of the ice making compartment 202.

A hinge type door 301a is disposed on the front surface of the refrigerating compartment 301, and drawer doors 302a and 201a are disposed in the vegetable compartment 302, the freezing compartment 201, the ice making compartment 202, and the small freezer compartment, respectively. 202a.

Further, a control substrate having a control unit 102 built therein is disposed on the back surface of the casing 100, and an operation panel 104 is provided on the front surface of the door 301a of the refrigerating chamber 301, and the operation panel 104 is provided for operation control. A plurality of switches, a display portion, and an external temperature sensor 105 of the portion 102.

In the rear portion of the casing 100, there is provided a freezing evaporator (hereinafter referred to as "F evaporator") 4 for cooling the F zone 2, which is used for cooling the F zone 2; A fan for freezing (hereinafter referred to as "F fan") 6; a refrigerating evaporator for refrigerating the R zone 3, which is a refrigerating evaporator (hereinafter referred to as "R evaporator") 5 And a refrigerating air blowing fan (hereinafter referred to as "R fan") 7 for circulating cold air in the R zone 3.

Each of the storage chambers is maintained at a predetermined set temperature by the F evaporator 4, the R evaporator 5, the F fan 6, and the R fan 7, respectively, and the F evaporator 4 and the R evaporator 5 are mechanically passed from the lower portion of the back of the casing 100. The coolant supplied from the compressor 9 provided in the chamber 8 is cooled.

Further, on the back surface of the refrigerating chamber 301, an R sensor 106 for detecting the temperature in the refrigerator of the R zone 3 is disposed, and on the back surface of the freezing compartment 201, the temperature in the refrigerator of the F zone 2 is detected. F sensor 108.

(2) Structure of the refrigeration cycle 50

The structure of the refrigeration cycle 50 of the refrigerator 1 will be described based on Fig. 2 .

As shown in FIG. 2, the refrigeration cycle 50 of the refrigerator 1 includes a compressor 9 that ejects high-temperature and high-pressure coolant gas, and a condenser (condenser) 10 that receives the coolant gas ejected from the compressor 9 and dissipates heat and liquefaction; The valve 11 is provided at the outlet side of the condenser 10 to switch the coolant flow path; the F evaporator 4; the R evaporator 5; the capillary tube for freezing (the decompression device for freezing, hereinafter referred to as "F capillary" "12" and a capillary for refrigeration (a decompression device for refrigeration, hereinafter referred to as "R capillary") 13 as a narrowing mechanism for the F evaporator 4 and the R evaporator 5, and a check valve 14.

A three-way valve 11 as one type of switching valve is provided on the outlet side of the condenser 10, and switches the coolant flow path toward the F evaporator 4 and the R evaporator 5, and also serves as an expansion capable of narrowing the flow rate. The valve functions.

The compressor 9, the condenser 10, and the three-way valve 11 are connected in series, and the F capillary 12 and the F evaporator 4 are connected in series to the freezing side outlet (hereinafter referred to as "F outlet") of the three-way valve 11. Return valve 14.

The R capillary 13 and the R evaporator 5 are connected in series to the refrigerating side outlet (hereinafter referred to as "R outlet") of the three-way valve 11.

The piping connected to the outlet side of the check valve 14 is merged with the piping connected to the outlet side of the R evaporator 5, and is connected to the compressor 9 as a suction pipe (suction pipe) 15.

Therefore, the F evaporator 4 on the low temperature side connected from the F outlet of the three-way valve 11 via the F capillary 12 and the R evaporator 5 on the high temperature side connected from the R outlet of the three-way valve 11 via the R capillary 13 are connected in parallel. Connected to the ground.

The F capillary 12 and the R capillary 13 are embedded in a heat insulating material (urethane) constituting the casing 100 in a welded state so as to constitute a heat exchanger with the suction pipe 15.

In the F evaporator 4, an F evaporator sensor 110 for detecting the temperature thereof is provided, and in the R evaporator 5, an R evaporator sensor 112 for detecting the temperature thereof is provided.

(3) Structure of the machine room 8

The structure of the machine room 8 will be described with reference to Figs. 3 to 5 .

As shown in FIG. 3, the machine room 8 is disposed at a lower rear portion of the F zone 2 located at the lower portion of the casing 100, and is separated from the F zone 2 by a heat-insulating front plate 17 which is inclined rearward as it goes upward. The space of the machine room 8 is formed by the front plate 17, the compressor base 16 as the bottom surface, and the side plates.

The compressor 9 provided in the machine room 8 is attached to the right side of the compression seat (hereinafter referred to as a compressor seat) 16 provided in the width direction of the casing 100 from the front surface of the refrigerator 1 via an elastic member.

As shown in FIG. 3 and FIG. 4, a blower fan (hereinafter referred to as "C fan") 18 for cooling, and a condenser 10 are provided on the left side of the compressor block 16 as viewed from the front surface of the refrigerator 1. The evaporating dish 19 in which the frost water evaporates.

The C fan 18 is mounted in the fan casing 20, and is disposed such that the axial flow becomes the front-rear direction of the machine room 8. On the compressor block 16 in front of the lower end of the fan casing 20, as shown in Fig. 4, an intake port 21 for the outside air is opened along the width of the fan casing 20.

The condenser 10 is disposed behind the C fan 18 with the lower end portion facing the C fan 18. The condenser 10 is erected along the recess 22, which is formed on the back surface of the casing 100 and extends above the machine room 8.

As shown in FIG. 5, the back surface of the machine room 8 is covered by the cover 23. The lid body 23 has a shape in which the air blown from the C fan 18 flows in a substantially central direction of the width of the casing 100, and an exhaust port 24 is provided behind the compressor 9.

In other words, the intake port 21 that introduces air from the outside into the machine room 8 and the exhaust port 24 that discharges the air that cools the compressor 9 disposed in the machine room 8 are disposed in the machine room 8, respectively. Diagonal corners.

Further, the lid body 23 is extended so as to cover the upper end portion of the condenser 10, and is provided with an exhaust port 25 which is a duct formed between the lid body 23 and the recess portion 22 (duct). ) connected.

The C fan 18 rotates to blow air from the air intake port 21 into the machine room 8 and to the rear, and the air collides with the cover body 23, a part of which is branched to the center of the width of the casing 100, and the other part is shunted. To the top.

The air that has been branched into the center of the width of the casing 100 is heat-exchanged with the compressor 9 to cool the compressor 9, and then flows out from the exhaust port 24 of the lid body 23 to the outside.

Then, the air branched upward flows into the duct formed by the recess 22 and the lid body 23, exchanges heat with the condenser 10, cools the condenser, and then flows out from the exhaust port 25 at the upper portion of the lid body 23 to the outside.

(4) Structure of the three-way valve 11

The three-way valve 11 in the refrigeration cycle 50 will be described with reference to FIG.

As shown in FIG. 6, the three-way valve 11 has a valve seat 32 provided at the bottom of a valve case 31, and a valve body 33 disposed at an upper portion of the valve seat 32.

On the valve seat 32, an R outlet 32R is formed to allow the coolant to flow out toward the R evaporator 5 side, an F outlet 32F to allow the coolant to flow out toward the F evaporator 4 side, and an inflow port 34 to allow the coolant to pass from The condenser 10 flows in through the inlet pipe 37.

The valve body 33 is disposed on the upper portion of the valve seat 32 so as to cover the R outlet 32R and the F outlet 32F formed in the valve seat 32, and is subjected to a pulse control stepping motor (not shown). ) can be rotated angularly.

Further, in the valve body 33, the distance from the rotation shaft 33a is different from each other and the position in the circumferential direction is shifted, and the R groove 33R and the F groove 33F are formed on the lower surface of the thick wall portion 33b.

With the stepping motor, the valve body 33 is rotated by a predetermined angle in the clockwise direction indicated by an arrow K in FIG. 6 in the present example, so that the R groove 33R and the R outlet 32R, or the F groove 33F and the F outlet 32F are vertically overlapped. In either case, neither the F groove 33R nor the R groove 33F overlaps with the F outlet 32R and the R outlet 32F, and the F outlet 32R and the F outlet 32F are closed by the valve body 33.

When the R groove 33R communicates with the R outlet 32R, the coolant flowing into the valve casing 31 from the inflow port 34 enters the R groove 33R from the open end edge of the thick wall portion 33b, flows out from the R outlet 32R, and passes through the R outlet. The piping 35 introduces a coolant into the R capillary 13 and the R evaporator 5.

When the F groove 33F communicates with the F outlet 32F, the coolant that has flowed into the valve casing 31 from the inflow port 34 enters the F groove 33F from the open end edge of the thick wall portion 33b, flows out from the F outlet 32F, and passes through the F outlet. The piping 36 introduces a coolant into the F capillary 12 and the F evaporator 4.

When the F outlet 32F and the R outlet 32R are closed by the thick wall portion 33b of the valve body 33, the coolant supply to the F evaporator 4 and the R evaporator 5 is blocked.

Further, the R groove 33R is formed such that the cross-sectional area gradually increases toward the rear end from the distal end in the rotational direction, and the rotation angle of the valve body 33 is controlled by the stepping motor, whereby the R groove 33R and the R outlet can be changed. The area where 32R coincides.

Thereby, the opening degree of the R outlet 32R can be adjusted, and the flow rate of the coolant supplied to the R evaporator 5 can be narrowed and adjusted, from fully closed to fully open.

Further, similarly to the R groove 33R, the F groove 33F is formed so as to gradually increase in cross-sectional area toward the rear end from the distal end in the rotational direction, and the rotation of the valve body 33 is controlled by the stepping motor. With the angle, the opening degree of the F outlet 32F can be adjusted to narrow the coolant flow rate supplied to the F evaporator 4, from fully closed to fully open.

For example, as shown in FIG. 4, the three-way valve 11 is disposed in the air passage from the intake port 21 to the C fan 18, and is disposed on the windward side of the compressor 9 and the condenser 10.

Further, among the outlet pipes 35 and 36 connected to the three-way valve 11, the outlet pipes 35 and 36 connected to the R outlet 32R and the F outlet 32F provided with the adjustable coolant flow rate are covered with the heat insulating materials 38 and 38.

On the other hand, the inlet pipe 37 is not covered with the heat insulating material, and is exposed in the air passage from the intake port 21 to the C fan 18.

(5) Electrical structure of the refrigerator 1

Next, the electrical structure of the refrigerator 1 will be described based on the block diagram of FIG.

As shown in FIG. 7, the control unit 102 provided on the control board includes a micro computer, and is connected to the motor of the compressor 9, the R fan 7, the F fan 6, and the C fan 18.

Further, the control unit 102 is connected to the operation panel 104 provided on the door 301a of the refrigerating compartment 301, the outside air temperature sensor 105 provided on the operation panel 104, the three-way valve 11, the R sensor 106, and the F sensor. The device 108, the R evaporator sensor 112, and the F evaporator sensor 110.

(6) Cooling mode

In the refrigerator 1 of the above configuration, the control unit 102 performs switching control of the three-way valve 11 based on the detected temperatures of the R sensor 106 and the F sensor 108 provided in the F zone 2 or the R zone 3, thereby performing execution. The refrigerating cooling mode (hereinafter referred to as "R mode") in which the coolant flows to the R evaporator 5 to cool only the R zone 3, and the cooling of the F zone 2 by flowing the coolant to the F evaporator 4 The chilled cooling mode (hereinafter referred to as "F mode").

(7) The operating state of the refrigerator 1

Next, the operation state of the refrigerator 1 of the present example will be described based on the flowcharts of Figs. 8 and 9 .

In step S1, the control unit 102 determines whether the detected temperature of the F sensor 108 is greater than or equal to the F start temperature TF1 (for example, -18 ° C) (step S1), if it is greater than or equal to the F start temperature TF1 ( For example, -18 ° C) (Y (step S1)), the control unit 102 starts the F mode (step S3).

If it is lower than the F start temperature TF1 (NO (n) of step S1), it is judged whether or not the detected temperature of the R sensor 106 is equal to or greater than the R start temperature TR1 (step S2).

If the detected temperature of the R sensor 106 is equal to or greater than the R start temperature TR1 (for example, 4 ° C) (y of step S2), the control section 102 starts the R mode in FIG. 9 (step S11). If it is lower than the R start temperature TR1 (n of step S2), it returns to step S1.

The control unit 102 starts the F mode (step S3), that is, the control unit 102 sets the R outlet 32R of the three-way valve 11 to the fully closed state in the F mode, and sets the F outlet 32F to the fully open state to flow the coolant to the F. The evaporator 4, and the F fan 6 is rotated, and the air cooled by the F evaporator 4 is sent to the F zone 2.

The rotational speed of the compressor 9 is controlled by an inverter in conjunction with the detected temperature of the F sensor 108. For example, the lower the detected temperature of the F sensor 108, the more the rotational speed of the compressor 9 is gradually reduced to achieve energy saving.

Further, the control unit 102 determines whether or not the number of revolutions of the compressor 9 is equal to or smaller than the predetermined number of revolutions A (step S4), and if it is equal to or less than the predetermined number of revolutions A (YES in step S4), the opening degree of the F outlet 32F is narrowed ( Step S6).

If it is higher than the predetermined rotation speed A (NO in step S4), it is judged whether or not the detected temperature of the outside air temperature sensor 105 is equal to or higher than a predetermined temperature B ° C (for example, 27 ° C) (step S5).

For example, if the frequency control in the inverter control of the compressor 9 is performed at 19 Hz to 70 Hz, the rotation speed corresponding to 28.8 Hz corresponds to the predetermined rotation speed A.

When the detected temperature of the outside air temperature sensor 105 is equal to or higher than the predetermined temperature B ° C (for example, 27 ° C) (y of step S5), the control unit 102 narrows the opening degree of the F outlet 32F (step S6).

If the detected temperature of the outside air temperature sensor 105 is lower than the predetermined temperature B ° C (n in step S5), it is determined whether or not the F mode is ended (step S7).

In step S6, since the number of revolutions of the compressor 9 is equal to or less than a predetermined number of revolutions or the outside air temperature is equal to or greater than B degrees, the control unit 102 narrows the opening degree of the F outlet 32F of the three-way valve 11 to 1% to 50% (preferred) 10%) so far.

Then, it is determined whether or not the F mode is ended (step S7). By narrowing the F outlet 32F, the amount of pressure reduction inside the F evaporator 4 can be optimized, which contributes to energy saving.

The reasons for optimization are as follows. When the rotation speed of the compressor 9 is high, if the opening degree of the F outlet 32F is narrowed, the amount of pressure reduction of the F evaporator 4 becomes excessive, which may cause a decrease in the refrigeration capacity or deterioration in energy saving.

Further, when the outside air temperature is low, the liquefied coolant is mostly retained inside the condenser 10, so if the opening degree of the F outlet 32F is narrowed, the coolant inside the F evaporator 4 becomes insufficient, thereby causing the freezing ability. Since the control unit 102 does not narrow the opening degree and is controlled to the fully open state, the control unit 102 narrows the F outlet only when the compressor 9 is equal to or less than the predetermined rotation speed A or the outside air temperature is equal to or greater than B °C. 32F, thereby optimizing the amount of pressure reduction of the F evaporator 4.

In step S7, the control unit 102 determines whether or not the F mode is ended. For example, if the detected temperature of the F sensor 108 becomes equal to or less than the F end temperature TF2 (for example, -22 ° C) (y of step S7), control is performed. The unit 102 determines whether or not the F mode is ended and shifts to the R mode (step S8). If it is greater than or equal to the F end temperature TF2 (n of step S7), the process returns to step S4.

If the detected temperature of the R sensor 106 is greater than or equal to the R start temperature TR1 (y of step S8), the control section 102 shifts to the R mode, and if it is lower than the R start temperature TR1 (n of step S8), Return to step S1.

Then, the control unit 102 determines whether or not the F outlet 32F of the three-way valve 11 is in the narrowed state (step S9), and if it is in the fully open state (n in step S9), the process proceeds to step S11 shown in Fig. 9, if it is narrowed. In the state (y in step S9), the F outlet 32F is set to the fully open state (step S10).

The control unit 102 opens the F outlet 32F of the three-way valve 11 from the narrowed state to the fully open state for a predetermined time (for example, five seconds) (step S10), and applies foreign matter (for example, copper powder) stuck in the F outlet 32F. Exclude and proceed to step S11 where the R mode is started.

The control unit 102 starts the R mode (step S11). In the R mode, the F outlet 32F of the three-way valve 11 is set to the fully closed state, the R outlet 32R is set to the fully open state, the coolant from the condenser 10 is sent to the R evaporator 5, and the R fan 7 is rotated. The air cooled by the R evaporator 5 is sent to the R zone 3.

At this time, the compressor 9 is also lower in the detection temperature of the R sensor 106, and the rotation speed is lowered to perform the energy-saving operation. Then, the process proceeds to step S12.

Then, the control unit 102 determines whether or not the number of revolutions of the compressor 9 is equal to or smaller than the predetermined number of revolutions A (step S12), and if the number of revolutions is equal to or less than the predetermined number of revolutions A (y of step S12), proceeds to the R outlet of the narrowing three-way valve 11 In step S14 of 32R, if it is higher than the predetermined rotation speed A (n in step S12), it is judged whether or not the detected temperature of the outside air temperature sensor 105 is equal to or higher than the predetermined temperature B °C (step S13).

When the detected temperature of the outside air temperature sensor 105 is equal to or higher than the predetermined temperature B ° C (y in step S13), the control unit 102 proceeds to step S14 of narrowing the R outlet 32R of the three-way valve 11.

If the detected temperature of the outside air temperature sensor 105 is lower than the predetermined temperature B ° C (n in step S13), it is determined whether or not the R mode is ended (step S15).

In the step S14, the control unit 102 narrows the R outlet 32R of the three-way valve 11 in order to optimize the amount of pressure reduction of the R evaporator 5 in the same manner as described above to perform the energy-saving operation.

In step S15, the control unit 102 determines whether or not the R mode is ended (step S15), for example, if the detected temperature of the R sensor 106 becomes equal to or less than the R end temperature TR2 (for example, 1 ° C) (y of step S15) Then, the control unit 102 determines whether or not the R mode is ended and shifts to the F mode (step S16).

If the detected temperature of the R sensor 106 is equal to or greater than the R end temperature TR2 (n in step S15), the process returns to step S1.

In step S16, the control unit 102 determines whether or not the transition to the F mode is made. If the detected temperature of the F sensor 108 is greater than or equal to the F start temperature TF1 (y of step S16), the control unit 102 determines to transition to the F mode. Whether the R outlet 32R is in a narrowed state (step S17).

If the detected temperature of the F sensor 108 is lower than the F start temperature TF1 (n of step S16), the process returns to step S1.

The control unit 102 determines whether or not the R outlet 32R is in the narrowed state in order to change from the R mode to the F mode (step S17), and if it is in the narrowed state (y in step S17), the R outlet 32R is fully opened (step S18).

When the R outlet 32R is in the fully open state in the narrowed state (n in step S17), the process returns to step S3.

In step S18, since the R outlet 32R of the three-way valve 11 is in a narrowed state, the control unit 102 is in a fully open state for a predetermined period of time to exclude the foreign matter that has been caught, and then returns to step S3.

(8) Effect

According to the present example, when the state in which the outlet of the three-way valve 11 is narrowed is changed to the other cooling mode, the outlet is set to the fully open state for a predetermined period of time, and the foreign matter that has been caught is excluded and converted, so even if the transition is made By setting the outlet to the fully closed state to the other cooling mode, the outlet can be surely closed without coolant leakage.

(9) Change example

In the above example, when the F outlet 32F of the three-way valve 11 is narrowed from the fully open state in the F mode, the rotation speed of the compressor 9 reaches a predetermined rotation speed A or the outside air temperature is equal to or higher than the predetermined temperature B. In the case of °C, the F outlet 32F of the three-way valve 11 may be narrowed only when the number of revolutions of the compressor 9 is equal to or greater than the predetermined number of revolutions A and the outside air temperature is equal to or greater than the predetermined temperature B.

Further, in the R mode, the R outlet 32R may be narrowed only when the number of revolutions of the compressor 9 is equal to or greater than the predetermined number of revolutions A and the outside air temperature is equal to or higher than the predetermined temperature B.

[Example 2]

Next, the refrigerator 1 of Example 2 of the present invention will be described based on Fig. 10 .

Example 2 differs from Example 1 in that, as the cooling mode, the R mode and the F mode can be performed in the example 1, and in the example 2, the control section 102 can perform the cooling in addition to the R mode and the F mode. The agent flows to both the R evaporator 5 and the F evaporator 4 to simultaneously cool the simultaneous cooling modes of the R zone 3 and the F zone 2 (hereinafter, referred to as "RF mode"), and performs cooling operation using the three cooling modes. .

As shown in FIG. 10, the cooling operation is performed in the order of the R mode, the RF mode, and the F mode. In the RF mode, the opening degree of the R outlet 32R of the three-way valve 11 is narrowed to be smaller than the opening degree in the R mode, so that the flow path resistance toward the R evaporator 5 in the RF mode is larger than that in the R mode. resistance.

Further, the control method in the R mode and the F mode is the same as in the case 1, in particular, when the F mode is to be changed from the F mode to the R mode, in a case where the F outlet 32F of the three-way valve 11 is not fully open and is in a narrowed state, Similarly to the example 1, the F outlet 32F is set to the fully open state after the predetermined time elapsed state, and the state is changed to the R mode.

When the R mode is to be changed from the R mode to the RF mode, if the R outlet 32R is in the narrowed state, it can be directly switched to the RF mode, or it can be narrowed again after being temporarily set to the fully open state, thereby shifting to the RF. mode.

When the RF mode is to be changed to the F mode, the R outlet 32R in the RF mode is in a narrowed state. Therefore, after being temporarily set to the fully open state for a predetermined period of time, the state is fully closed and the mode is shifted to the F mode.

In the example 2, even if foreign matter is caught in the R outlet 32R of the three-way valve 11 during execution of the RF mode, since the R outlet 32R is temporarily set to the fully open state, the foreign matter can be removed, and then R can be removed. The outlet 32R is set to the fully closed state.

[Example 3]

Next, the refrigerator 1 of Example 3 of the present invention will be described.

In the above examples, when the R mode or the RF mode is to be changed to the F mode, only when the R outlet 32R of the three-way valve 11 is in the narrowed state, the foreign matter is temporarily set to the fully open state, and then the foreign matter is removed, and then the full-closed state is set. Transition to F mode.

At this time, the F outlet 32F of the three-way valve 11 in the F mode may not be fully opened due to the number of revolutions of the compressor 9, and the opening degree may be adjusted in the narrowed state.

However, after switching from the other mode (R mode or RF mode) to the F mode, the amount of cooling inside the F evaporator 4 is immediately reduced, so that the cooling capacity is insufficient.

For this reason, in the example 3, when transitioning from the other mode to the F mode, regardless of the rotational speed of the compressor 9, the following control is performed, that is, the F outlet 32F of the three-way valve 11 is set to a prescribed time (for example, , 1 minute) fully open state, and then narrowed to an appropriate opening corresponding to the rotational speed of the compressor 9.

Thus, in Example 3, after the coolant is quickly spread throughout the R evaporator 4, it is possible to perform cooling by an appropriate amount of narrowing of the F outlet 32F of the three-way valve 11, and thus it is possible to contribute to energy saving of the refrigerator 1.

In the above, an embodiment of the present invention has been described, but the embodiment is merely illustrative and is not intended to limit the scope of the invention. The present invention can be implemented in various other forms, and various omissions, substitutions and changes can be made without departing from the scope of the invention. The invention or its modifications are intended to be included within the scope and spirit of the invention and are included in the scope of the invention described in the appended claims.

1. . . refrigerator

2. . . F area

3. . . R area

4. . . F evaporator

5. . . R evaporator

6. . . F fan

7. . . R fan

8. . . Mechanical room

9. . . compressor

10. . . Condenser (condenser)

11. . . Three-way valve

12. . . Freezing capillary (F capillary)

13. . . Capillary for refrigeration (R capillary)

14. . . Check valve

15. . . Straw (suction tube)

16. . . Compressor seat

17. . . Ger

18. . . Cooling fan for cooling (C fan)

19. . . Evaporating dish

20. . . Fan shell

twenty one. . . Suction port

twenty two. . . Concave

twenty three. . . Cover

24, 25. . . exhaust vent

31. . . Valve box

32. . . Seat

32F. . . F exit

32R. . . R exit

33. . . Valve body

33a. . . Rotary axis

33b. . . Thick wall section

33F. . . F slot

33R. . . R slot

34. . . Inflow

35. . . R outlet piping

36. . . F outlet piping

37. . . Entrance piping

38. . . Insulation materials

50. . . Refrigeration cycle

100. . . cabinet

102. . . Control department

104. . . Operation panel

105. . . External temperature sensor

106. . . R sensor

108. . . F sensor

110. . . F evaporator sensor

112. . . R evaporator sensor

201. . . Freezer

201a, 202a, 302a. . . Withdrawable door

202. . . Ice making room

301. . . Cold room

301a. . . Hinged door

302. . . Vegetable room

K. . . arrow

Fig. 1 is a longitudinal sectional view showing a refrigerator of Example 1 of the present invention.

2 is a view of a refrigeration cycle of a refrigerator.

Fig. 3 is a perspective view as seen from the back of the refrigerator.

4 is a longitudinal sectional view of a machine room of a refrigerator.

Fig. 5 is a perspective view of the mechanical chamber in a state in which a cover body is attached, as seen from the back.

Figure 6 is a plan view of a three-way valve.

Figure 7 is a block diagram of the refrigerator.

Figure 8 is a first flow chart in Example 1.

Fig. 9 is a second flowchart of the first flowchart in the first embodiment.

FIG. 10 is a timing chart of three cooling modes in Example 2.

Step S1: The control unit 102 determines whether the detected temperature of the F sensor 108 is a preset value greater than or equal to the F start temperature TF1.

Step S2: determining whether the detected temperature of the R sensor 106 is greater than or equal to the R start temperature TR1

Step S3: The control unit 102 starts the F mode.

Step S4: The control unit 102 determines whether the rotational speed of the compressor 9 is equal to or less than a predetermined rotational speed A.

Step S5: The control unit 102 determines whether the detected temperature of the external air temperature sensor 105 is greater than or equal to a predetermined temperature B ° C

Step S6: The control unit 102 narrows the opening of the F outlet 32F.

Step S7: The control unit 102 determines whether or not to end the F mode.

Step S8: The control unit 102 determines whether to end the F mode and shift to the R mode.

Step S9: The control unit 102 determines whether the F outlet 32F of the three-way valve 11 is in a narrowed state.

Step S10: The control unit 102 sets the F outlet 32F to the fully open state.

Claims (7)

A refrigerator having a refrigeration cycle of the following structure as a refrigeration cycle, that is, in the order of a compressor, a condenser, and a three-way valve having a narrowing function, and a refrigerating side outlet of the three-way valve is connected In the refrigerating evaporator, a freezing evaporator is connected to the freezing side outlet, and the refrigerating evaporator and the freezing evaporator are connected to the compressor, and the refrigerator has a control unit that performs a refrigerating cooling mode. Or performing a chilled cooling mode in which a coolant is supplied to the refrigerating evaporator in a state where only the refrigerating side outlet of the three-way valve is fully opened or narrowed, the freezing The cooling mode is to convey the coolant to the freezing evaporator in a state where only the freezing side outlet of the three-way valve is fully opened or in a narrowed state, and the refrigerator is characterized in that the control Performing the cooling in a state where an outlet of the three-way valve corresponding to any one of the refrigerating cooling mode or the refrigerating cooling mode is narrowed When After formula, to change to another cooling mode, after the exit from the narrowing of the three-state for a predetermined time is set to the fully opened state of the valve, the transition to another cooling mode. The refrigerator according to claim 1, wherein the control unit narrows the freezing side outlet of the three-way valve during execution of the chilled cooling mode. The refrigerator according to claim 1, wherein the control unit narrows the refrigerating side outlet of the three-way valve during execution of the refrigerating and cooling mode. The refrigerator according to claim 1, wherein the control unit is capable of performing a simultaneous cooling mode in addition to the freezing and cooling mode and the refrigerating and cooling mode, wherein the simultaneous cooling mode is to perform the three-way The two outlets of the valve are simultaneously set to an open state to simultaneously deliver the coolant to the refrigerating evaporator and the freezing evaporator, and the control unit is to be in the simultaneous cooling mode When the state in which the refrigerating side outlet of the three-way valve is narrowed is shifted to another cooling mode, the state in which the refrigerating side outlet is narrowed is set to a predetermined time fully open state, and then transitions to the other cooling mode. . The refrigerator according to claim 1, wherein the control unit controls the freezing side outlet or the refrigerating side outlet of the three-way valve when a rotation speed of the compressor is lower than a predetermined rotation speed Any one narrows. The refrigerator according to the first aspect of the invention, wherein the control unit is any one of the freezing side outlet or the refrigerating side outlet of the three-way valve when the outside air temperature is equal to or greater than a predetermined temperature. Make a narrowing. The refrigerator according to the first aspect of the invention, wherein, when the control unit transitions from the other cooling mode to the chilled cooling mode, the freezing side outlet is set to a predetermined time fully open state and then narrowed.