JP5897215B1 - refrigerator - Google Patents

Abstract

The refrigerator is provided with a refrigerant circulation circuit 10 having a compressor 1, a radiator 2, a decompressor 3, and a cooler 4, a cooler 4, and a cooling chamber 7 that generates cooling air, and is cooled using the cooling air. Storage chamber A8a, a damper 6a that adjusts the amount of cooling air blown from the cooling chamber 7 to the storage chamber, a temperature sensor 21 that detects the temperature of the storage chamber, and a controller that controls the compressor 1 and the damper 6a. The control unit 50 controls the compressor 1 such that operation and stop are alternately repeated, and at least during the stop period of the compressor 1, the air volume of the cooling air adjusted by the damper 6a is controlled. It is variably controlled based on the temperature of the storage chamber A8a.

Description

  The present invention relates to a refrigerator.

  As a conventional refrigerator, a storage room, a refrigerant circulation circuit in which a compressor, a radiator, a decompressor and a cooler are connected by piping, a cooling room in which a cooler is disposed, and cooling air from the cooling room to the storage room. And a blower to be sent. In a conventional refrigerator, a refrigeration cycle is constructed by driving a compressor. During operation of the compressor, the storage room continues to cool, so the temperature of the storage room gradually decreases. When the temperature of the storage room falls below a predetermined temperature and it is determined that cooling is not necessary, the compressor is stopped to stop cooling of the storage room. While the compressor is stopped, the storage chamber is warmed by the outside air around the refrigerator, so that the temperature gradually rises with time. When it is determined that the storage room temperature exceeds a predetermined temperature and the storage room needs to be cooled, the compressor is started and cooling is started again. Thus, since starting and stopping of the compressor are repeated, the temperature of each storage chamber has repeatedly increased and decreased.

  Patent Document 1 describes a refrigerator-freezer that cools a refrigerator compartment while the compressor is stopped. In this refrigerator-freezer, while the compressor is stopped, the refrigerator compartment is cooled by the heat capacity of the evaporator, and when the heat capacity of the evaporator is insufficient, cooling by the compressor is performed. However, in the refrigerator-freezer of patent document 1, since control which makes the temperature of a storage room constant is not made, the temperature of a storage room will repeat a raise and a fall again.

Japanese Patent No. 3484131

  FIG. 13 is a timing chart showing an example of a temperature change in the storage room. (A) of FIG. 13 represents the temperature of the refrigerator compartment, (b) represents the temperature of the freezer compartment, (c) represents the operating state (ON / OFF) of the compressor, and (d ) Represents the opening degree of the damper for the refrigerator compartment. The compressor starts when the temperature of the freezer compartment exceeds a predetermined upper limit temperature (time t3, t6), and stops when the temperature of the freezer compartment falls below a predetermined lower limit temperature (time t2, t5). Controlled. The damper for the refrigerator compartment is fully opened when the compressor is in operation and the temperature of the refrigerator compartment exceeds the predetermined upper limit temperature (time t3, t6), and the temperature of the refrigerator compartment falls below the predetermined lower limit temperature. It is controlled to be fully closed at (time t1, t4). When such control is performed, the temperature of the storage chamber repeatedly rises and falls as shown in FIG. As a result, the temperature of the food stored in the storage chamber also repeatedly rises and falls, so that there is a problem that the quality of the food tends to deteriorate. This problem is particularly likely to occur in a refrigerator room where the target temperature is set to around 0 ° C to 10 ° C.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a refrigerator capable of making the temperature of a storage room more constant and preventing deterioration of food quality. And

A refrigerator according to the present invention includes a refrigerant circulation circuit having a compressor, a radiator, a decompressor, and a cooler, a cooling chamber in which the cooler is disposed, and at least one storage chamber that is cooled using cooling air. , to adjust the air volume of the cooling air blown before Symbol storage compartment, and the air volume adjusting unit having a first damper provided in the air passage between the reservoir chamber and the cooling chamber, the temperature of the storage chamber And a control unit that controls the compressor and the air volume adjusting unit, wherein the control unit controls the compressor so that operation and stop are alternately repeated , and the first The damper opens at a first opening that is not fully closed during the stop period of the compressor, and opens at a second opening that is larger than the first opening when the compressor is started. is there.

  According to the present invention, during the stop period of the compressor 1, it is possible to blow the cooling air generated by using the frost attached to the cooler or the heat capacity of the cooler itself as a cold heat source to the storage room with an appropriate air volume. The temperature of the storage room can be made more constant, and deterioration of the quality of food can be prevented.

It is a block diagram which shows schematic structure of the refrigerator which concerns on Embodiment 1 of this invention. It is a block diagram which shows the example of the information input / output by the structure of the control part 50 of the refrigerator which concerns on Embodiment 1 of this invention, and the control part 50. FIG. It is a flowchart which shows the example of the flow of the temperature constant control process performed in the control part 50 of the refrigerator which concerns on Embodiment 1 of this invention. It is a timing chart which shows an example of the operation | movement in the temperature constant control of the refrigerator which concerns on Embodiment 1 of this invention. It is a flowchart which shows the example of the flow of the temperature constant control process performed in the control part 50 of the refrigerator which concerns on Embodiment 1 of this invention. It is a timing chart which shows an example of the operation | movement in the temperature constant control of the refrigerator which concerns on Embodiment 1 of this invention. It is a block diagram which shows schematic structure of the refrigerator which concerns on Embodiment 2 of this invention. It is a block diagram which shows schematic structure of the refrigerator which concerns on Embodiment 3 of this invention. It is a flowchart which shows the example of the flow of the temperature constant control process performed in the control part 50 of the refrigerator which concerns on Embodiment 3 of this invention. It is a block diagram which shows schematic structure of the refrigerator which concerns on Embodiment 4 of this invention. It is a flowchart which shows the example of the flow of the temperature fixed control process performed in the control part 50 of the refrigerator which concerns on Embodiment 4 of this invention. It is a timing chart which shows an example of the operation | movement in the temperature constant control of the refrigerator which concerns on Embodiment 4 of this invention. It is a timing chart which shows the example of the temperature change of a store room.

Embodiment 1 FIG.
A refrigerator according to Embodiment 1 of the present invention will be described. The present embodiment is an example in the case where an air volume adjusting unit is installed in the air path to the storage room A among the plurality of storage rooms A and B, and a damper is used as the air volume adjusting unit. Here, the set temperature of the storage room A is higher than the set temperature of the storage room B.

  FIG. 1 is a block diagram showing a schematic configuration of the refrigerator according to the present embodiment. In FIG. 1, the flow path of the cooling air and the flow path of the refrigerant are mainly shown. As shown in FIG. 1, the refrigerator of the present embodiment includes a storage room A8a (for example, a refrigeration room), a storage room B8b (for example, a freezing room) having a lower set temperature than the storage room A8a, a storage room A8a, and And a cooling chamber 7 that generates cooling air for cooling the storage chamber B8b. The cooling chamber 7 and the storage chamber A8a communicate with each other via a common supply air passage 11 and a supply air passage 12, and a return air provided separately from the common supply air passage 11 and the supply air passage 12. It communicates via a passage 14 and a common return air passage 16. The cooling chamber 7 and the storage chamber B8b communicate with each other through a common supply air passage 11 and a supply air passage 13, and return air provided separately from the common supply air passage 11 and the supply air passage 13 is provided. It communicates via a path 15 and a common return air path 16.

  One end (upstream end) of the common supply air passage 11 is connected to the cooling chamber 7. The other end (downstream end) of the common supply air path 11 is connected to one end (upstream end) of each of the supply air paths 12 and 13. The other end (downstream end) of the supply air passage 12 is connected to the storage chamber A8a, and the other end (downstream end) of the supply air passage 13 is connected to the storage chamber B8b. That is, the cooling air generated in the cooling chamber 7 first circulates through the common supply air passage 11, and then is divided into the supply air passages 12 and 13 so as to be blown out to the storage chamber A 8 a and the storage chamber B 8 b. It has become.

  One end (upstream end) of the return air passage 14 is connected to the storage chamber A8a, and one end (upstream end) of the return air passage 15 is connected to the storage chamber B8b. The other end (downstream end) of each of the return air passages 14 and 15 is connected to one end (upstream end) of the common return air passage 16. The other end (downstream end) of the common return air passage 16 is connected to the cooling chamber 7. That is, the return air from the storage chamber A8a and the storage chamber B8b first flows through the return air passages 14 and 15, and then merges in the common return air passage 16 to return to the cooling chamber 7.

  The common supply air passage 11 is provided with a blower 5 for blowing the cooling air in the cooling chamber 7 to the storage chamber A8a and the storage chamber B8b. For example, the rotational speed of the blower 5 is variably controlled by the control unit 50 described later.

  A damper 6 a is provided in the supply air passage 12. The damper 6a has a plate-like member and a rotating shaft, and can close the supply air passage 12 and adjust the opening degree. The damper 6a adjusts the air volume of the cooling air passing through the supply air passage 12, and prevents the cooling air from flowing backward. The opening degree of the damper 6a is variably controlled by the control unit 50 described later.

  Moreover, the refrigerator has a refrigerant circulation circuit that constitutes a refrigeration cycle. The refrigerant circuit has a configuration in which a compressor 1, a radiator 2 (for example, a condenser), a decompressor 3 and a cooler 4 (evaporator) are connected via a refrigerant pipe. In the compressor 1 of this example, the rotation speed is variably controlled by the control unit 50. Moreover, the heat radiator 2 of this example is an air heat exchanger or a copper tube provided along the outer wall surface of the refrigerator. The cooler 4 is disposed in the cooling chamber 7.

  Next, the flow of the refrigerant in the refrigerant circuit will be described. The high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 1 flows into the radiator 2. The refrigerant that has flowed into the radiator 2 is condensed by dissipating heat to the outside air around the refrigerator. The condensed high-pressure liquid refrigerant is decompressed by the decompressor 3 to become a low-pressure two-phase refrigerant. Thereafter, the refrigerant flows into the cooler 4 installed in the cooling chamber 7. In the cooler 4, heat exchange between the air in the cooling chamber 7 and the refrigerant is performed. By this heat exchange, the air in the cooling chamber 7 is cooled, and the refrigerant becomes a low-pressure gas refrigerant. The low-pressure gas refrigerant flows into the compressor 1 and is compressed again.

  Next, the flow of cooling air will be described. The cooling air cooled in the cooling chamber 7 is conveyed by the blower 5, passes through the common supply air passage 11 and the supply air passages 12 and 13, and flows into each storage chamber (in this example, the storage chamber A 8 a and the storage chamber B 8 b). To do. Each storage chamber is cooled by incoming cooling air. The temperature of each storage room is adjusted by adjusting the air volume of the incoming cooling air. The air volume of the cooling air is adjusted by, for example, controlling the rotational speed of the blower 5 or the opening degree of the damper 6a by the control unit 50 described later. The cooling air that has cooled each storage chamber returns to the cooling chamber 7 through the return air passages 14 and 15 and the common return air passage 16, and is cooled again.

  Next, sensors will be described. A temperature sensor 21 that detects the temperature in the storage room A8a is installed in the storage room A8a. A temperature sensor 22 that detects the temperature in the storage room B8b is installed in the storage room B8b. In the example shown in FIG. 1, temperature sensors are installed in all the storage rooms, but this is not a limitation. The temperature sensor should just be installed at least in the 1 or more storage chamber in which the temperature fixed control mentioned later is performed. The installation positions of the temperature sensors 21 and 22 are not limited to the positions shown in FIG. The temperature sensors 21 and 22 may be installed anywhere as long as they represent the temperature of each storage room.

  FIG. 2 is a block diagram illustrating a configuration of the control unit 50 and an example of information input / output by the control unit 50. The control unit 50 includes, for example, a microcomputer including a CPU, a storage unit, an input / output unit, a timer, and the like. The control unit 50 controls the entire refrigerator based on detection values of various sensors, preset setting values, and the like. In the example illustrated in FIG. 2, the control unit 50 is connected to the temperature sensors 21 and 22, the compressor 1, the blower 5, the damper 6 a, and the like. The control unit 50 controls the rotational speed and the like of the compressor 1 based on the temperature detected by the temperature sensors 21 and 22. The control unit 50 of this example starts the compressor 1 at least when the temperature detected by the temperature sensor 22 (the temperature of the storage chamber B8b) exceeds a predetermined upper limit temperature, and the detected temperature falls below the predetermined lower limit temperature. The compressor 1 is stopped. Thereby, the compressor 1 is controlled so that operation and stop are repeated alternately. Moreover, the control part 50 is based on the detected temperature of the temperature sensors 21 and 22, the rotation speed of the compressor 1, etc., the rotation speed of the air blower 5, the operation amount of the air volume adjustment part (damper 6a in this example), etc. To control.

  Next, the content of the control (hereinafter referred to as “temperature constant control”) for making the temperature of the storage room (for example, the storage room A8a) more constant will be described. First, constant temperature control by adjusting the opening degree of the damper 6a will be described as an example of constant temperature control in the present embodiment. FIG. 3 is a flowchart showing an example of the flow of constant temperature control processing executed by the control unit 50. The process shown in FIG. 3 is started when the compressor 1 is stopped.

  First, in step S101, the blower 5 is driven. If the blower 5 is already driven, the drive is continued as it is.

  Next, in step S102, a preset target temperature Tm_a of the storage chamber A8a and a detected temperature T_a of the storage chamber A8a by the temperature sensor 21 are acquired. Then, the temperature difference (Tm_a−T_a) is calculated, and it is determined whether or not the temperature difference (Tm_a−T_a) is greater than zero. When the temperature difference (Tm_a−T_a) is larger than 0 ((Tm_a−T_a)> 0), the storage chamber A8a is determined to be excessively cooled, and therefore the opening angle of the damper 6a is reduced by Δθ ( Step S103). Thereafter, the process proceeds to step S106. On the other hand, when the temperature difference (Tm_a−T_a) is 0 or less, the process proceeds to step S104.

  In step S104, it is determined whether the temperature difference (Tm_a−T_a) is smaller than zero. If the temperature difference (Tm_a−T_a) is smaller than 0 ((Tm_a−T_a) <0), it is determined that the storage chamber A8a is insufficiently cooled, and therefore the opening angle of the damper 6a is increased by Δθ (step S105). ). Thereafter, the process proceeds to step S106. On the other hand, when the temperature difference (Tm_a−T_a) is 0, since the detected temperature T_a matches the target temperature Tm_a, the current opening angle of the damper 6a is maintained, and the process proceeds to step S106.

  In step S106, it is determined whether or not the compressor 1 is activated. When the compressor 1 is activated, the process returns to the normal control, and when the compressor 1 is not activated, the process returns to step S102. Thereby, during the stop period of the compressor 1, the processes of steps S102 to S105 are repeated until the compressor 1 is started. That is, during the stop period of the compressor 1, the opening degree (open angle) of the damper 6a is variably controlled in a multi-step or stepless manner based on the temperature of the storage chamber A8a. Here, the amount of change Δθ of the opening angle of the damper 6a may be a fixed value or a value changed according to the temperature difference (Tm_a−T_a). “Multi-stage” means three or more stages.

  Next, an operation concept in the above constant temperature control will be described. FIG. 4 is a timing chart showing an example of the operation in the above constant temperature control. 4A shows the temperature of the refrigerator compartment (an example of the storage room A8a), FIG. 4B shows the temperature of the freezer room (an example of the storage room B8b), and FIG. 4C shows the compressor 1. (D) shows the opening degree of the refrigerator 6a for refrigerator compartments.

  Here, an upper limit temperature and a lower limit temperature are set in the freezer compartment with a set temperature (broken line in FIG. 4B) interposed therebetween, and the compressor 1 is operated when the temperature of the freezer compartment exceeds the upper limit temperature ( It is started at time t3, t6) and controlled to stop when the temperature of the freezer compartment falls below the lower limit temperature (time t2, t5).

  The damper 6a is controlled based on the temperature of the refrigerator compartment during the operation period of the compressor 1. Specifically, at least a lower limit temperature is set in the refrigerating room, and the damper 6a is used when the temperature of the refrigerating room falls below the lower limit temperature during the operation period of the compressor 1 (in the example of FIG. It is controlled to be fully closed at t1). Further, the damper 6a is controlled so as to be fully opened when the compressor 1 is started (in the example of FIG. 4, times t3 and t6).

  In the constant temperature control in the present embodiment, even during the stop period of the compressor 1, the opening degree of the damper 6a is variably controlled in multiple steps or in a stepless manner based on the temperature of the refrigerator compartment. Thereby, during the stop period of the compressor 1, the temperature of the refrigerator compartment is kept more constant. Comparing FIG. 4A and FIG. 13A, it can be seen that the temperature of the refrigerator compartment is maintained more constant during the stop period of the compressor 1.

  Next, as another example of the constant temperature control in the present embodiment, the constant temperature control by adjusting the opening time or closing time of the damper 6a will be described. In this example, the damper 6a is controlled to two positions, for example, fully open or fully closed, and the open / closed state (fully open / fully closed) of the damper 6a is switched every relatively short time. By adjusting at least one of the opening time when the damper 6a is fully opened and the closing time when the damper 6a is fully closed (for example, the opening time), the ratio between the opening time and the closing time (opening / closing duty ratio) is set. Adjusted. As a result, the air volume per unit time in the supply air passage 12 provided with the damper 6a is variably adjusted.

  FIG. 5 is a flowchart showing an example of the flow of constant temperature control processing executed by the control unit 50. The process shown in FIG. 5 is started when the compressor 1 is stopped. FIG. 6 is a timing chart showing an example of the operation in this constant temperature control. 6A shows the temperature of the refrigerator compartment (an example of the storage room A8a), FIG. 6B shows the temperature of the freezer room (an example of the storage room B8b), and FIG. 6C shows the compressor 1. (D) shows the opening degree of the refrigerator 6a for refrigerator compartments.

  First, in step S201, the blower 5 is driven. If the blower 5 is already driven, the drive is continued as it is.

  Next, in step S202, a preset target temperature Tm_a of the storage chamber A8a and a detected temperature T_a of the storage chamber A8a by the temperature sensor 21 are acquired. Then, the temperature difference (Tm_a−T_a) is calculated, and it is determined whether or not the temperature difference (Tm_a−T_a) is greater than zero. When the temperature difference (Tm_a−T_a) is larger than 0 ((Tm_a−T_a)> 0), it is determined that the storage chamber A8a is excessively cooled, so the opening time of the damper 6a is decreased by Δt ( Step S203). Thereafter, the process proceeds to step S206. On the other hand, when the temperature difference (Tm_a−T_a) is 0 or less, the process proceeds to step S204.

  In step S204, it is determined whether or not the temperature difference (Tm_a−T_a) is smaller than zero. When the temperature difference (Tm_a−T_a) is smaller than 0 ((Tm_a−T_a) <0), it is determined that the storage chamber A8a is insufficiently cooled, and thus the opening time of the damper 6a is increased by Δt (step S205). ). Thereafter, the process proceeds to step S206. On the other hand, when the temperature difference (Tm_a−T_a) is 0, since the detected temperature T_a matches the target temperature Tm_a, the current opening time of the damper 6a is maintained, and the process proceeds to step S206.

  In step S206, it is determined whether the compressor 1 has started. When the compressor 1 is activated, the process returns to the normal control, and when the compressor 1 is not activated, the process returns to step S202. Thereby, during the stop period of the compressor 1, the processes of steps S202 to S205 are repeated until the compressor 1 is started. That is, during the stop period of the compressor 1, the opening / closing duty ratio of the damper 6a is variably controlled in a multi-stage or steplessly based on the temperature of the storage chamber A8a (see FIG. 6 (d)). Here, the change amount Δt of the opening time of the damper 6a may be a fixed value or a value changed according to the temperature difference (Tm_a−T_a).

  Next, the principle by which the temperature of the storage room can be made more constant by the temperature constant control in the present embodiment will be described. Since the cooling capacity of the refrigeration cycle becomes 0 during the stop period of the compressor 1, air cannot be cooled using the refrigeration cycle as a cold heat source. However, since the frost adhering to the cooler 4 during the operation period of the compressor 1 or the heat capacity of the cooler 4 itself can be used as a cold heat source, the cooling chamber 7 has some degree during the stop period of the compressor 1. The air can be cooled. Thereby, the rise in the temperature of the storage chamber can be suppressed by introducing the cooling air of the cooling chamber 7 into the storage chamber with an appropriate air volume. Therefore, during the stop period of the compressor 1, the air volume of the cooling air to the storage room is variably controlled in multiple stages or steplessly based on the temperature of the storage room, so that FIG. As shown in a), the temperature of the storage room can be kept more constant. As a result, the temperature of the food in the storage chamber can be kept more constant, and deterioration of the quality of the food can be prevented.

Embodiment 2. FIG.
A refrigerator according to Embodiment 2 of the present invention will be described. The present embodiment is an example in which an air volume adjusting unit is installed in the air path to each of the plurality of storage chambers A and B, and a damper is used as the air volume adjusting unit. Here, the set temperature of the storage room A is higher than the set temperature of the storage room B. FIG. 7 is a block diagram showing a schematic configuration of the refrigerator according to the present embodiment. In addition, about the component which has the function and effect | action same as Embodiment 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 7, in the configuration of the present embodiment, in addition to the damper 6 a provided in the supply air passage 12, the damper 6 b is provided in the supply air passage 13. The damper 6b has a plate-like member and a rotating shaft, and can close the supply air passage 13 and adjust the opening degree. The damper 6b adjusts the air volume of the cooling air passing through the supply air passage 13, and prevents the cooling air from flowing backward. The opening degree of the damper 6b is variably controlled by the control unit 50.

  For the constant temperature control in the present embodiment, the same control as in the first embodiment can be used. That is, the temperature of the storage chamber A8a can be controlled to be constant by variably adjusting the opening angle of the damper 6a based on the temperature of the storage chamber A8a, and the damper 6b can be opened based on the temperature of the storage chamber B8b. By adjusting the angle variably, the temperature constant control of the storage chamber B8b can be performed. Further, by variably adjusting the opening / closing duty ratio of the damper 6a based on the temperature of the storage chamber A8a, the temperature constant control of the storage chamber A8a can be performed, and the damper 6b is controlled based on the temperature of the storage chamber B8b. By adjusting the open / close duty ratio variably, the temperature constant control of the storage chamber B8b can be performed.

  In the first embodiment, when the constant temperature control of the storage room A8a is performed using the damper 6a, air having a higher temperature than the temperature of the storage room B8b may flow into the storage room B8b. On the other hand, in the present embodiment, the damper 6b that can adjust the air volume of the air flowing into the storage room B8b is provided. Therefore, the temperature of the storage room B8b rises due to the inflow of warm air by fully closing the damper 6b. Can be prevented. Thereby, since the temperature rise of storage room B8b whose temperature is lower than storage room A8a can be prevented, compared with Embodiment 1, the stop time of the compressor 1 can be extended stably. As a result, the average input of the refrigerator can be reduced, and the refrigerator can be energy-saving.

Embodiment 3 FIG.
A refrigerator according to Embodiment 3 of the present invention will be described. The present embodiment is an example in the case where an air volume adjusting unit is installed in the air path to the storage chamber B among the plurality of storage rooms A and B, and a damper is used as the air volume adjusting unit. Moreover, in this Embodiment, the air blower provided in the common air path of the storage chambers A and B is also used as an air volume adjustment part. Here, the set temperature of the storage room A is higher than the set temperature of the storage room B. FIG. 8 is a block diagram showing a schematic configuration of the refrigerator according to the present embodiment. In addition, about the component which has the function and effect | action same as Embodiment 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 8, in the configuration of the present embodiment, the damper 6 b is provided in the supply air passage 13, but the damper is not provided in the supply air passage 12.

  Since the constant temperature control of the storage chamber B8b using the damper 6b in the present embodiment is the same as the constant temperature control of the storage chamber A8a using the damper 6a in the first embodiment, description thereof is omitted.

  Next, temperature constant control of the storage chamber A8a using the damper 6b and the blower 5 will be described. FIG. 9 is a flowchart showing an example of the flow of constant temperature control processing executed by the control unit 50. The process shown in FIG. 9 is started when the compressor 1 is stopped.

  First, in step S301, the blower 5 is driven and the damper 6b is fully closed.

  Next, in step S302, the preset target temperature Tm_a of the storage chamber A8a and the detected temperature T_a of the storage chamber A8a by the temperature sensor 21 are acquired. Then, the temperature difference (Tm_a−T_a) is calculated, and it is determined whether or not the temperature difference (Tm_a−T_a) is greater than zero. When the temperature difference (Tm_a−T_a) is larger than 0 ((Tm_a−T_a)> 0), it is determined that the storage room A8a is excessively cooled, and thus the rotational speed of the blower 5 is decreased by Δf ( Step S303). Thereafter, the process proceeds to step S306. On the other hand, when the temperature difference (Tm_a−T_a) is 0 or less, the process proceeds to step S304.

  In step S304, it is determined whether or not the temperature difference (Tm_a−T_a) is smaller than zero. When the temperature difference (Tm_a−T_a) is smaller than 0 ((Tm_a−T_a) <0), it is determined that the storage chamber A8a is insufficiently cooled, and thus the rotational speed of the blower 5 is increased by Δf (step S305). ). Thereafter, the process proceeds to step S306. On the other hand, when the temperature difference (Tm_a−T_a) is 0, since the detected temperature T_a matches the target temperature Tm_a, the current rotational speed of the blower 5 is maintained, and the process proceeds to step S306.

  In step S306, it is determined whether or not the compressor 1 has been started. When the compressor 1 is activated, the process returns to the normal control, and when the compressor 1 is not activated, the process returns to step S302. Thereby, during the stop period of the compressor 1, the processes of steps S302 to S305 are repeated until the compressor 1 is started. That is, during the stop period of the compressor 1, the rotational speed of the blower 5 is variably controlled in multiple steps or steplessly based on the temperature of the storage chamber A 8 a. Here, the amount of change Δf of the rotational speed of the blower 5 may be a fixed value or a value changed according to the temperature difference (Tm_a−T_a).

  In the first embodiment, when the constant temperature control of the storage room A8a is performed using the damper 6a, air having a higher temperature than the temperature of the storage room B8b may flow into the storage room B8b. On the other hand, in this embodiment, since the constant temperature control of the storage chamber A8a can be performed with the damper 6b fully closed, it is possible to prevent the temperature increase of the storage chamber B8b due to warm air inflow. In addition, the temperature constant control of the storage chamber A8a can be performed with a small number of components.

Embodiment 4 FIG.
A refrigerator according to Embodiment 4 of the present invention will be described. The present embodiment is an example in the case where an air volume adjusting unit is installed in the air path to each of the plurality of storage rooms A and B, and a blower is used as the air volume adjusting unit. Here, the set temperature of the storage room A is higher than the set temperature of the storage room B. FIG. 10 is a block diagram showing a schematic configuration of the refrigerator according to the present embodiment. In addition, about the component which has the function and effect | action same as Embodiment 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 10, in the configuration of the present embodiment, the supply air passage 12 is provided with a blower 9a, and the supply air passage 13 is provided with a blower 9b. The number of rotations of the blowers 9a and 9b is variably controlled by the control unit 50. In the present embodiment, since the cooling air can be blown into the storage chamber A8a and the storage chamber B8b by driving the blowers 9a and 9b, the blower 5 provided in the common supply air passage 11 in the first embodiment. May be omitted.

  Next, the flow of the cooling air in the present embodiment will be described. The cooling air cooled in the cooling chamber 7 is conveyed by the blowers 9a and 9b, passes through the common supply air passage 11 and the supply air passages 12 and 13, and flows into the storage chamber A8a and the storage chamber B8b. The storage room A8a and the storage room B8b are cooled by the inflowing cooling air. The air volume of the cooling air flowing into the storage room A8a is adjusted by controlling the rotational speed of the blower 9a by the control unit 50. The air volume of the cooling air flowing into the storage room B8b is adjusted by controlling the rotation speed of the blower 9b by the control unit 50. The cooling air that has cooled the storage chamber A8a and the storage chamber B8b returns to the cooling chamber 7 through the return air passages 14 and 15 and the common return air passage 16, and is cooled again.

  The control part 50 of this Embodiment is connected with the temperature sensors 21 and 22, the compressor 1, and the air blowers 9a and 9b. The control unit 50 controls the rotational speed and the like of the blowers 9a and 9b based on the detected temperatures of the temperature sensors 21 and 22, the rotational speed of the compressor 1, and the like.

  Next, the constant temperature control of the storage chamber in the present embodiment will be described. Here, the temperature constant control of the storage chamber A8a using the blower 9a will be described, but the temperature constant control of the storage chamber B8b using the blower 9b can be similarly implemented. FIG. 11 is a flowchart illustrating an example of a flow of temperature constant control processing executed by the control unit 50 in the present embodiment. The process shown in FIG. 11 is started when the compressor 1 is stopped. FIG. 12 is a timing chart showing an example of the operation in this constant temperature control. (A) of FIG. 12 represents the temperature of the refrigerator compartment (an example of the storage room A8a), (b) represents the temperature of the freezer room (an example of the storage room B8b), and (c) represents the compressor 1. (D) represents the number of rotations of the refrigerator 9a for the refrigerator compartment.

  First, in step S401, the blower 9a is driven. If the blower 9a is already driven, the driving is continued as it is.

  Next, in step S402, a preset target temperature Tm_a of the storage room A8a and a detected temperature T_a of the storage room A8a by the temperature sensor 21 are acquired. Then, the temperature difference (Tm_a−T_a) is calculated, and it is determined whether or not the temperature difference (Tm_a−T_a) is greater than zero. When the temperature difference (Tm_a−T_a) is larger than 0 ((Tm_a−T_a)> 0), it is determined that the storage room A8a is excessively cooled, and thus the rotational speed of the blower 9a is decreased by Δf ( Step S403). Thereafter, the process proceeds to step S406. On the other hand, when the temperature difference (Tm_a−T_a) is 0 or less, the process proceeds to step S404.

  In step S404, it is determined whether the temperature difference (Tm_a−T_a) is smaller than zero. When the temperature difference (Tm_a−T_a) is smaller than 0 ((Tm_a−T_a) <0), it is determined that the storage chamber A8a is insufficiently cooled, and thus the rotational speed of the blower 9a is increased by Δf (step S405). ). Thereafter, the process proceeds to step S406. On the other hand, when the temperature difference (Tm_a−T_a) is 0, since the detected temperature T_a matches the target temperature Tm_a, the current rotational speed of the blower 9a is maintained, and the process proceeds to step S406.

  In step S406, it is determined whether the compressor 1 has started. When the compressor 1 is activated, the process returns to the normal control, and when the compressor 1 is not activated, the process returns to step S402. Thereby, during the stop period of the compressor 1, the processes of steps S402 to S405 are repeated until the compressor 1 is started. That is, during the stop period of the compressor 1, the rotational speed of the blower 9a is variably controlled in a multistage or stepless manner based on the temperature of the storage chamber A8a (see FIG. 12 (d)). Here, the amount of change Δf of the rotational speed of the blower 9a may be a fixed value or a value changed according to the temperature difference (Tm_a−T_a).

  In the present embodiment, since the fans 9a and 9b are provided corresponding to the storage chamber A8a and the storage chamber B8b, respectively, unlike the first to third embodiments, the cooling air is conveyed at the minimum required number of fan rotations. can do. For this reason, in addition to being able to perform temperature constant control during the stop period of the compressor 1, the input of a fan can be reduced and the refrigerator can be energy-saving.

  As described above, in the refrigerator according to the above embodiment, the refrigerant circulation circuit 10 including the compressor 1, the radiator 2, the decompressor 3, and the cooler 4 and the cooler 4 are arranged to generate cooling air. Cooling chamber 7, at least one storage chamber (for example, storage chamber A8a, storage chamber B8b) that is cooled by using cooling air, and air volume adjustment that adjusts the air volume of cooling air blown from cooling chamber 7 to the storage chamber (For example, dampers 6a, 6b, blowers 5, 9a, 9b, etc.), temperature sensors 21 and 22 for detecting the temperature of the storage room, and a control unit 50 for controlling the compressor 1 and the air volume adjusting unit. The control unit 50 controls the compressor 1 so that operation and stop are alternately repeated, and at least during the stop period of the compressor 1, the control unit 50 determines the air volume of the cooling air adjusted by the air volume control unit. Variable based on It is intended to.

  Moreover, in the refrigerator which concerns on the said embodiment, the air volume adjustment part has the dampers 6a and 6b provided in the supply air path 12 and 13 between the cooling chamber 7 and the storage room, and the control part 50 is The opening degree of the dampers 6a and 6b is variably controlled based on the temperature of the storage chamber.

  Moreover, in the refrigerator which concerns on the said embodiment, the air volume adjustment part has the dampers 6a and 6b provided in the supply air path 12 and 13 between the cooling chamber 7 and the storage room, and the control part 50 is The ratio between the opening time and the closing time of the dampers 6a and 6b (open / close duty ratio) is variably controlled based on the temperature of the storage chamber.

  Moreover, in the refrigerator which concerns on the said embodiment, the air volume adjustment part has the air blowers 5, 9a, 9b which blow cooling air from the cooling chamber 7 to a storage room, and the control part 50 is the air blowers 5, 9a, The rotational speed of 9b is variably controlled based on the temperature of the storage chamber.

  In the refrigerator according to the above embodiment, the storage room includes the first storage room A8a and the second storage room B8b having a lower set temperature than the storage room A8a, At least the amount of cooling air blown from the cooling chamber 7 to the storage chamber A8a is adjusted, and the controller 50 causes the compressor 1 to be operated and stopped alternately based on the temperature of the storage chamber B8b. And at least during the stop period of the compressor 1, the air volume of the cooling air blown into the storage chamber A8a is variably controlled based on the temperature of the storage chamber A8a.

  Further, in the refrigerator according to the above-described embodiment, the air volume adjusting unit further adjusts the air volume of the cooling air blown from the cooling chamber 7 to the storage chamber B 8 b, and the control unit 50 includes at least the compressor 1. During the stop period, the air volume of the cooling air blown into the storage room B8b is variably controlled based on the temperature of the storage room B8b.

Other embodiments.
The present invention is not limited to the above embodiment, and various modifications can be made.
For example, in the above-described embodiment, a refrigerator including two storage chambers is taken as an example, but the present invention can also be applied to a refrigerator including one or three or more storage chambers.

  In addition, the above embodiments and modifications can be implemented in combination with each other.

  1 compressor, 2 radiator, 3 decompressor, 4 cooler, 5 blower, 6a, 6b damper, 7 cooling chamber, 8a storage chamber A, 8b storage chamber B, 9a, 9b blower, 10 refrigerant circulation circuit, 11 common Supply air path, 12, 13 Supply air path, 14, 15 Return air path, 16 Common return air path, 21, 22 Temperature sensor, 50 Control unit.

Claims (4)

A refrigerant circulation circuit having a compressor, a radiator, a decompressor and a cooler;
A cooling chamber in which the cooler is disposed;
At least one storage chamber cooled with cooling air;
Adjusting the air volume of the cooling air blown into the storage chamber, and an air volume adjusting unit having a first damper provided in an air path between the cooling chamber and the storage chamber;
A temperature sensor for detecting the temperature of the storage room;
A control unit for controlling the compressor and the air volume adjusting unit,
The control unit controls the compressor so that operation and stop are alternately repeated,
The first damper opens at a first opening that is not fully closed during the stop period of the compressor, and has a second opening that is greater than the first opening when the compressor is started. Open refrigerator. Provided separately from the storage room, further comprising a freezing room having a lower set temperature than the storage room,
The controller is
On the basis of the temperature of the freezer compartment, refrigerator as claimed in claim 1 operating and stopping the compressor and controls as are alternately repeated. A second damper provided in an air path between the cooling chamber and the freezing chamber;
The refrigerator according to claim 2 , wherein the control unit fully closes the second damper during a stop period of the compressor. The air volume adjusting unit further adjusts the air volume of the cooling air blown from the cooling chamber to the freezing chamber,
The refrigerator according to claim 2 , wherein the control unit variably controls the amount of cooling air blown into the freezer compartment based on the temperature of the freezer compartment at least during the stop period of the compressor.

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