JPH09178322A - Capacity control device of refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save the energy of a refrigerator by realizing appropriate number of revolution of a compressor and appropriate flow rate of an electric-driven expansion valve to cope with the change in the temperature of a cooler associated with opening/closing of an air passage control damper of the refrigerator on which an inverter is mounted to improve the operational efficiency and the cooling system efficiency of the refrigerator. SOLUTION: The number of revolutions of a compressor and the flow rate of an electric-driven expansion valve are determined by the number of revolutions and a flow rate operating means 25 using the output of an in-freezer differential temperature operating means 24, the number of revolutions and the flow passage resistance value are corrected by a number of revolutions and a flow rate correcting means 41 using the output from a cooler temperature detecting means 42, the number of revolutions of the compressor is controlled by an inverter circuit 26 by the command from the number of revolutions and the flow rate correcting means 41, and the flow rate is controlled by an electrically driven expansion valve control circuit 45.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator control device for efficiently cooling a room in a refrigerator to save energy.

[0002]

2. Description of the Related Art A control device for a refrigerator is a refrigerator freezer.
A damper, a fan, and a compressor are controlled so that the temperature of each of the refrigerator compartment and the vegetable compartment is controlled at a set temperature (for example, Japanese Patent Laid-Open No. 60-71874).

The temperature control will be described below with reference to the drawings of a conventional refrigerator control device.

FIG. 4 shows a block diagram of a conventional refrigerator control device. In FIG. 4, reference numeral 1 denotes a refrigerator main body, which is composed of an outer box 2 and an inner box 3 and a urethane foam heat insulating material 4 formed in a space between the outer box 2 and the inner box 3, and three doors 5, 6 and 7 are provided in a front opening. ing. The doors 5, 6, and 7 are arranged in correspondence with the openings of the freezing room (corresponding to the room in the claims) 8, the refrigerating room 9, and the vegetable room 10 of the refrigerator body 1, respectively. In the partition wall surrounded by the bottom plate 11a of the freezer compartment 8 and the top plate 11b of the refrigerating compartment 9, there is provided a capillary tube 12 as a decompressor, a cooler 13 connected to the capillary tube 12, and a fan 14 behind it. There is. In addition, the freezer compartment 8,
Ventilation paths 15 and 16 for introducing the cooling air from the cooler 13 into the respective compartments are formed at the back of the refrigerating compartment 9.
Reference numeral 17 is a compressor, and 18 is an electric damper.

Reference numeral 19 denotes a freezing room temperature sensor.
Reference numeral 20 denotes a freezer compartment control means, which is a freezer compartment temperature detection means 21,
The freezing room temperature setting means 23 is composed of a freezing room temperature difference calculating means 24 and a rotation speed calculating means 25.

The freezing room temperature detecting means 21 detects the indoor temperature of the freezing room 8 by the freezing room temperature sensor 19, and the freezing room temperature setting means 23 sets the freezing room temperature for setting the indoor temperature of the freezing room 8. When the switch 22 is operated, the indoor preset temperature is detected, and the indoor preset temperature of the freezer compartment 8 is set to, for example, -16 ° C, -18 ° C or -20 ° C.

The freezing room temperature difference calculating means 24 calculates the temperature difference between the indoor temperature of the freezing room 8 detected by the freezing room temperature detecting means 21 and the indoor setting temperature of the freezing room 8 detected by the freezing room temperature setting means 23. Then, the rotational speed calculation means 25 determines the rotational speed of the compressor 17 based on the temperature difference, and sends the determined rotational speed command to the inverter circuit 25, and the inverter circuit 26 operates the compressor 17 at the determined rotational speed.

FIG. 5 shows the rotation speed of the compressor 17 determined by the rotation speed calculation means 25. In FIG. 5, when the temperature of the freezing chamber is higher than the set temperature by 1 K (K indicates a temperature difference) to 2 K, the compressor 17 is operated to operate at 1800 rpm and 2 K.
~ 3K higher, 2400 rpm, 3K ~ 4K higher, 3000 rpm, 4K or higher, 3600 rpm, and 1K lower, compressor 17 stops (0 rpm)
As described above, the rotation speed calculation means 25 determines the rotation speed. Here, there are two rotation speeds between the temperature difference of -1K and 1K,
Once started at 1800 rpm, the operation is continued until the temperature difference becomes -1K, and once stopped, the operation is not started until the temperature difference becomes 1K. Reference numeral 26 denotes a cooling fan drive circuit which operates when the rotation speed determined by the rotation speed calculation means 25 is other than stop, operates the fan 14, and sends the cool air of the cooler 13 cooled by the operation of the compressor 17 into the room. Cooling.

Reference numeral 28 is a refrigerating room temperature sensor.
Reference numeral 30 denotes a refrigerating compartment control means, which is a refrigerating compartment temperature detecting means 31,
Refrigerating room temperature setting means 33 Refrigerating room temperature difference calculating means 34
It is composed of

The refrigerating compartment temperature detecting means 31 detects the temperature inside the refrigerating compartment by means of the refrigerating compartment temperature sensor 28, and the refrigerating compartment temperature setting means 33 sets the refrigerating compartment temperature setting switch 32 for setting the compartment temperature of the refrigerating compartment 9. Operate to detect the set temperature.

The refrigerating compartment temperature difference calculating means 34 calculates the temperature difference between the refrigerating compartment temperature detected by the refrigerating compartment temperature detecting means 31 and the set temperature in the refrigerating compartment detected by the refrigerating compartment temperature setting means 33. The opening / closing of the electric damper 18 is determined, and the opening / closing command is sent to the electric damper drive circuit 35, and the electric damper drive circuit 35 causes the electric damper 1 to operate based on the opening / closing command.
Open and close 8.

The operation of the operation control device for a refrigerator constructed as described above will be described below with reference to FIGS. 4 and 6.

FIG. 6 (a) is a flow chart for explaining the indoor temperature control of the freezer compartment 8 of the conventional refrigerator.
First, in S1, the freezing room temperature detecting means 21 detects the indoor temperature in the freezing room by the freezing room temperature sensor 19, and in S2 the freezing room temperature setting means 23 detects the set temperature in the freezing room by the freezing room temperature setting switch 22. . And S3
Then, the freezing room temperature difference calculating means 24 calculates the difference between the indoor temperature of the freezing room 8 and the indoor set temperature of the freezing room 8, and the rotation speed calculating means 25 at S4 operates the rotation speed of the compressor 17 as shown in FIG. Is determined and the rotation speed command determined in S5 is sent to the inverter circuit 26. At this time, the fan drive circuit 27
Determines whether the rotation speed command is stopped (0 rotation), stops the fan 14 when it is 0 rotation, and otherwise operates the fan 14 to blow air to the cooler 14 and cool the cooler 13 and heat. The room is cooled by exchanging it and sending cold air into the room.

FIG. 6B is a flow chart for explaining the indoor temperature control of the refrigerating compartment 9 of the conventional refrigerator.
First, in S6, the refrigerating room temperature detecting means 31 detects the room temperature of the refrigerating room 9 by the refrigerating room temperature sensor 28, and in S7, the refrigerating room temperature setting means 33 uses the refrigerating room temperature setting switch 32 to set the room temperature of the freezing room 8. To detect.

Then, in S8, the temperature difference calculating means 3 for the refrigerating room
Reference numeral 4 calculates the difference between the indoor temperature of the refrigerating compartment 9 and the indoor set temperature of the refrigerating compartment 9, determines whether to open or close the electric damper 18, and sends the opening / closing command determined in S9 to the electric damper drive 35. At this time, the electric damper drive circuit 35 opens / closes the electric damper 18 based on the opening / closing command.

As described above, when the electric damper 18 is open, the temperature control of the freezer compartment 8 controls the cold air sent during the operation of the compressor 17 into the refrigerating compartment 9 so that the temperature of the refrigerating compartment 9 is increased. Perform a key.

[0017]

However, in the above structure, the temperature of the cooler changes due to the opening and closing of the electric damper, and when the electric damper is closed, the air flow passing through the cooler is limited to the freezing chamber. Therefore, the temperature of the air passing through the cooler is lower than that when the electric damper is opened, so that the amount of heat exchange is reduced and the temperature of the cooler is lowered. The higher the temperature of the cooler, the lower the low pressure and the higher the efficiency of the system.However, regardless of the opening and closing of the electric damper, the rotation speed of the compressor is determined by the indoor temperature of the freezer and the indoor set temperature, so Even if the temperature is lowered, the compressor is operated at the same rotation speed, so that there is a problem that efficient operation cannot be performed.

Further, since the circulation amount of the refrigerant changes when the rotation speed of the compressor changes, the flow path resistance value of the pressure reducing device must be changed to obtain an appropriate evaporation amount. Since the above capillary tube is used, it is impossible to change the flow path resistance value in response to the change in the rotation speed of the compressor, so that there is a problem that an efficient operation cannot be performed.

The present invention solves the above problems.
Detects the temperature of the cooler, operates with the required cooling capacity, determines the compressor speed to maintain the cooler temperature at a temperature at which the efficiency is improved, and further determines the decompression device against changes in the compressor speed. An object of the present invention is to provide a refrigerator capacity control device that sets an appropriate flow path resistance value.

[0020]

In order to achieve the above object, a capacity control device for a refrigerator according to the present invention comprises an indoor temperature sensor provided in a room and an indoor temperature for detecting the indoor temperature by the indoor temperature sensor. Detection means, room temperature setting means for setting the temperature inside the room, and room temperature difference for calculating a difference between the room temperature detected by the room temperature detection means and the room temperature set by the room temperature setting means The calculation means and the rotation speed of the compressor and the rotation speed for determining the flow path resistance value of the pressure reducing device based on the output of the indoor temperature difference calculation means, the flow path resistance value calculation means, and the refrigerant compressed by the compressor are evaporated. , A cooler for cooling the room, and a cooler temperature sensor attached to the cooler,
Cooler temperature detection means for detecting the temperature of the cooler by the cooler temperature sensor, the rotation speed by the output from the cooler temperature detection means, the rotation speed determined by the flow path resistance value calculating means, and Rotation speed and flow path resistance value correcting means for correcting the flow path resistance value, an inverter circuit for controlling the rotation speed of the compressor in accordance with a command from the rotation speed and flow path resistance value correcting means, and flow path resistance of the pressure reducing device. And a circuit for controlling the.

Further, an indoor temperature sensor provided in the room, an indoor temperature detecting means for detecting the indoor temperature by the indoor temperature sensor, an indoor temperature setting means for setting the indoor temperature, and the indoor temperature detecting means. Indoor temperature difference calculating means for calculating the difference between the indoor temperature detected by the indoor temperature setting means and the indoor set temperature set by the indoor temperature setting means, and the rotation speed of the compressor and the pressure reducing device based on the output of the indoor temperature difference calculating means. The number of rotations for determining the flow path resistance value, flow path resistance value calculation means, a cooler for evaporating the refrigerant compressed by the compressor to cool the room, and a cooler temperature sensor attached to the cooler. , Cooler temperature detecting means for detecting the temperature of the cooler by the cooler temperature sensor, and output from the cooler temperature detecting means and the freezer compartment temperature setting means The rotation speed, the rotation speed determined by the flow path resistance value calculating means, the rotation speed for correcting the flow path resistance value, the flow path resistance value correcting means, and the rotation speed and the flow path resistance value correcting means. It is configured to include an inverter circuit that controls the rotation speed of the compressor according to a command, and a circuit that controls the flow path resistance of the pressure reducing device.

[0022]

According to the present invention, the indoor temperature is detected by the indoor temperature detecting means, the indoor temperature setting means is detected by the indoor temperature setting means, and the indoor temperature difference calculating means detects the indoor temperature and the indoor setting temperature. The temperature difference is calculated, the rotation speed and the flow passage resistance value calculation means determine the rotation speed of the compressor and the flow passage resistance value of the decompression device, and the cooler temperature detection means detects the cooler temperature to determine the cooler temperature. If the temperature falls below a certain temperature, the rotational speed of the compressor and the flow path resistance value of the pressure reducing device are corrected by the rotation speed and flow path resistance value correcting means, so the compressor can be operated with an appropriate cooling capacity, and an electric damper, etc. It is possible to save energy by preventing a decrease in operating efficiency due to excessive cooling of the cooler temperature during operation of the cooling system and improving cooling system efficiency by optimizing the flow path resistance value corresponding to the change in the rotational speed of the compressor. it can.

Further, since the number of rotations of the compressor can be corrected for each set temperature of the freezer compartment, no matter what the set temperature is set, the cooler temperature during operation of the electric damper or the like becomes too cold for each set temperature. Energy saving can be achieved by preventing a decrease in operating efficiency and improving cooling system efficiency by appropriately setting a flow path resistance value corresponding to a change in the number of revolutions of the compressor.

[0024]

First Embodiment An embodiment of the present invention will be described below with reference to the drawings. Further, in the figure, the same parts as those in the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 1 is a block diagram showing the construction of a capacity control device for a refrigerator according to the first embodiment of the present invention, and FIG. 2 is a flow chart for explaining the operation in the first embodiment of the present invention.

In FIG. 1, reference numeral 44 is an electric expansion valve provided as a pressure reducing device, and 45 is an electric expansion valve control circuit. Reference numeral 40 denotes an operation control device for the first freezing compartment 8, which has a freezing compartment temperature detecting means 21, a freezing compartment temperature setting means 23,
The freezing room temperature temperature difference calculating means 24, the rotation speed of the compressor 17, and the flow rate of the electric expansion valve 44 (generally, since the flow rate is set to correspond to the setting of the flow path resistance value in the electric expansion valve, the present embodiment is performed). In the example, description will be made by replacing the flow path resistance value with the flow rate).
9, rotation speed, flow rate correction means 41, and cooler temperature degree detection means 42.

The freezing room temperature detecting means 21 detects the temperature inside the freezing room by the freezing room temperature sensor 19, and the freezing room temperature setting means 23 includes a freezing room temperature setting switch 21 for setting the indoor temperature of the freezing room 8. If it is operated, the set temperature is detected, and the indoor set temperature of the freezer compartment 8 is, for example, -16 ° C,
Set to -18 ° C or -20 ° C.

The freezing room temperature difference calculating means 24 calculates the temperature difference between the freezing room temperature detected by the freezing room temperature detecting means 21 and the indoor setting temperature of the freezing room 8 detected by the freezing room temperature setting means 23, and The rotation speed and the flow rate calculating means 25 determine the rotation speed of the compressor 17 and the flow rate of the electric expansion valve 44 based on the temperature difference.

The cooler temperature detecting means 42 detects the temperature of the cooler based on the output of the cooler temperature sensor 43, and sends the cooler temperature to the rotation speed / flow rate correcting means 41.

The rotation speed / flow rate correction means 41 first determines the cooler temperature to be kept constant (hereinafter referred to as the rotation speed correction temperature) in accordance with the set temperature in the freezing chamber. The rotation speed correction temperature is equal to or lower than the preset temperature of the freezing compartment, and the interior of the freezing compartment 8 can be cooled, so that the temperature can be efficiently operated. For example, if the freezer compartment set temperatures are set to -16 ° C, -18 ° C, and -20 ° C, the rotation speed correction temperatures are set to -19 ° C, -21 ° C, and-, respectively.
Set to 23 ° C.

Further, if the cooler temperature is equal to or lower than the determined rotation speed correction temperature, the rotation speed and the flow rate determined by the rotation speed calculation means are set so that the cooler becomes the rotation speed correction temperature, The flow rate is corrected, the corrected rotation speed command is sent to the inverter circuit, and the corrected flow rate command is sent to the electric expansion valve control circuit. The inverter circuit 26 operates the compressor 17 at a predetermined rotation speed, and the electric expansion valve control circuit 4
5 sets the electric expansion valve 44 to the determined flow rate, and the fan drive circuit 27 operates the fan 14 when the rotation speed command is other than 0.

FIG. 3 shows the rotation speed of the compressor 17 and the flow rate of the electric expansion valve 44, which are determined by the rotation speed and the flow rate calculating means 25. The flow rate of the electric expansion valve 44 is set so that an appropriate evaporation amount can be obtained for each rotation speed of the compressor 17.

When the cooler temperature becomes equal to or lower than the rotation speed correction temperature, the rotation speed / flow rate correction means 41 is shown in FIG. 3 when the determined rotation speed is other than 0 rotation or the minimum rotation speed (1800 rotations in this embodiment). The indicated rotation speed and flow rate are corrected to the next lower rotation speed and flow rate.

The operation of the refrigerator capacity control device configured as described above will be described below with reference to FIGS. 1, 2, and 3.

FIG. 2 is a flow chart for explaining the temperature control. First, in S1, the freezing room temperature detecting means 2
1, the freezing room temperature sensor 19 detects the freezing room temperature, and the freezing room temperature setting means 23 detects the indoor set temperature of the freezing room 8 by the freezing room temperature setting switch 22 in S2.

Then, in S3, the freezing room temperature difference calculating means 2
4 calculates the difference between the indoor temperature of the freezer compartment 8 and the indoor set temperature of the freezer compartment 8, and the rotation speed and flow rate calculating means 25 at S4 are the operation rotation speed of the compressor 17 and the electric expansion valve 44 as shown in FIG. Determine the flow rate of.

In S10, the rotation speed correction means 41 determines the rotation speed correction temperature based on the freezer compartment set temperature detected by the freezer compartment temperature setting means 23, and in S11 the cooler temperature from the cooler temperature detection means 42 is detected.

Then, in S12, the rotation speed correction temperature and the cooler temperature are compared, and in S13 it is determined whether the cooler temperature is below the rotation speed correction temperature or above the rotation speed correction temperature.
4, the rotational speed and the flow rate determined in S4 are corrected to the rotational speed and the flow rate that are one lower than the rotational speed and the flow rate of the compressor 17 if the rotational speed of the compressor 17 is not 0 rotation or the minimum rotational speed, and the rotational speed command corrected in S5. Is sent to the inverter circuit 26 and the electric expansion valve control circuit 45.

If the cooler temperature is higher than the rotation speed correction temperature in S13, the process proceeds to S5. At this time, the fan drive circuit 27 determines whether or not the rotation speed command is stopped (0 rotation). When the rotation speed is 0 rotation, the fan 14 is stopped, and otherwise the fan 14 is operated to send air to the cooler 14 to cool the fan. The interior of the room is cooled by exchanging heat with the cooler 13 and sending cool air into the room.

The operation control of the refrigerator compartment 9 is the same as that shown in FIG. 6 (b). In the capacity control device for a refrigerator that performs such an operation, when the temperatures of the freezing compartment 8 and the refrigerating compartment 9 rise, the difference between the room temperature of the refrigerating compartment 9 and the room set temperature increases, and the electric damper drive means 35 causes the electric damper 18 to operate. open. The difference between the indoor temperature and the indoor set temperature also increases in the freezing compartment 8, the rotation speed / flow rate calculation means 25 determines the rotation speed of the compressor 17 and the flow rate of the electric expansion valve 44 according to the temperature difference, and the inverter circuit 26 is determined. The electric expansion valve control circuit 45 sets the electric expansion valve to the determined flow rate, the fan driving means 27 operates the fan 14, the cooler 13 is cooled, and the freezer compartment 8 is operated. And the refrigerating chamber 9 is cooled.

Next, when the room temperature of the freezing room 9 decreases, the temperature difference between the room temperature and the room set temperature decreases, and the rotation speed and flow rate calculating means 25 determines the rotation speed and the flow rate according to the temperature difference. Then, the inverter circuit 26 operates the compressor 17 at the rotation speed, and the electric expansion valve control circuit 45 sets the electric expansion valve to the determined flow rate. When the indoor temperature of the refrigerating compartment 9 becomes equal to or lower than the indoor set temperature, the electric damper driving means 35 closes the electric damper 18, the refrigerating compartment 9 is no longer cooled, and the cooler temperature is lowered. At this time, if the cooler temperature becomes equal to or lower than the rotation speed correction temperature and the rotation speed is 0 rotation or other than the minimum rotation speed, the rotation speed and the flow rate correction unit 41 corrects the rotation speed and the flow rate to the one lower rotation speed, A correction command is sent to the inverter circuit 26 and the electric expansion valve control circuit 45, and the inverter circuit 26 uses the corrected rotation speed to compress the compressor 17
The electric expansion valve control circuit sets the electric expansion valve 44 to the corrected flow rate. As a result, the high pressure decreases and the cooler temperature rises.

In this embodiment, the rotational speed to be corrected and the flow rate are corrected stepwise, but the rotational speed to be corrected and the flow rate can be continuously corrected.

Therefore, in the present embodiment, the rotational speed of the compressor and the flow rate of the electric expansion valve are determined by the temperature difference between the freezing chamber temperature and the set temperature in the freezing chamber, and the rotational speed correction temperature is determined by the set temperature in the freezing chamber for cooling. If the temperature of the device falls below the rotation speed correction temperature, the rotation speed of the compressor and the flow rate of the electric expansion valve will be set to the rotation speed and flow rate one level lower, so the compressor can be operated with an appropriate cooling capacity and the operation of the electric damper, etc. It is possible to save energy by preventing a decrease in operating efficiency due to excessive cooling of the cooler temperature at the time, and improving cooling system efficiency by appropriately setting the flow path resistance value corresponding to the change in the rotational speed of the compressor.

Further, since the number of revolutions of the compressor can be corrected for each set temperature of the freezing room, no matter what the set temperature is set, the cooler temperature during operation of the electric damper or the like becomes too cold for each set temperature. Energy saving can be achieved by preventing a decrease in operating efficiency and improving cooling system efficiency by appropriately setting a flow path resistance value corresponding to a change in the number of revolutions of the compressor.

[0045]

As described above, the capacity control device for a refrigerator according to the present invention is provided with an indoor temperature sensor provided in the room, an indoor temperature detecting means for detecting the indoor temperature by the indoor temperature sensor, and the indoor room. Room temperature setting means for setting the temperature of the room, room temperature difference calculating means for calculating the difference between the room temperature detected by the room temperature detecting means and the room temperature set by the room temperature setting means, and the room temperature difference calculating means. Cooling for cooling the room by evaporating the refrigerant compressed by the compressor, the rotation speed of the compressor and the flow path resistance value calculation means for determining the flow path resistance value of the pressure reducing device based on the output of the temperature difference calculation means A cooler, a cooler temperature sensor attached to the cooler, and cooler temperature detecting means for detecting the temperature of the cooler by the cooler temperature sensor,
By the output from this cooler temperature detection means, the number of revolutions,
The rotation speed determined by the flow path resistance value calculating means, the rotation speed for correcting the flow path resistance value, the flow path resistance value correcting means, and the compressor based on the rotation speed and the command from the flow path resistance value correcting means. By providing an inverter circuit for controlling the number of revolutions and a circuit for controlling the flow path resistance of the pressure reducing device, the indoor temperature is detected by the indoor temperature detecting means, and the indoor set temperature is detected by the indoor temperature setting means. The temperature difference calculation means calculates the temperature difference between the room temperature and the room set temperature, and the rotation speed and the flow passage resistance value calculation means determine the rotation speed of the compressor and the flow passage resistance value of the decompression device to determine the cooler temperature. When the cooler temperature is detected by the detecting means and the cooler temperature becomes equal to or lower than a certain temperature, the rotation speed of the compressor and the flow passage resistance value of the pressure reducing device are set to the rotation speed,
Since it is corrected by the flow path resistance value correction means, it is possible to operate the compressor with an appropriate cooling capacity, prevent the operation efficiency from decreasing due to overcooling of the cooler temperature during operation of the electric damper, and prevent changes in the compressor rotation speed. Energy saving can be achieved by improving the efficiency of the cooling system by appropriately setting the flow path resistance value.

Further, an indoor temperature sensor provided in the room, an indoor temperature detecting means for detecting the indoor temperature by the indoor temperature sensor, an indoor temperature setting means for setting the indoor temperature, and the indoor temperature detecting means. Indoor temperature difference calculating means for calculating the difference between the indoor temperature detected by the indoor temperature setting means and the indoor set temperature set by the indoor temperature setting means, and the rotation speed of the compressor and the pressure reducing device based on the output of the indoor temperature difference calculating means. The number of rotations for determining the flow path resistance value, flow path resistance value calculation means, a cooler for evaporating the refrigerant compressed by the compressor to cool the room, and a cooler temperature sensor attached to the cooler. , Cooler temperature detecting means for detecting the temperature of the cooler by the cooler temperature sensor, and output from the cooler temperature detecting means and the freezer compartment temperature setting means The rotation speed, the rotation speed determined by the flow path resistance value calculating means, the rotation speed for correcting the flow path resistance value, the flow path resistance value correcting means, and the rotation speed and the flow path resistance value correcting means. By including an inverter circuit that controls the rotation speed of the compressor according to a command and a circuit that controls the flow path resistance of the pressure reducing device, the room temperature is detected by the room temperature detecting means, and the set temperature in the room is set to the room temperature setting means. The temperature difference between the room temperature and the room set temperature is calculated by the indoor temperature difference calculation means, and the rotation speed and the flow passage resistance value calculation means determine the rotation speed of the compressor and the flow passage resistance value of the pressure reducing device. If the cooler temperature is detected by the cooler temperature detecting means and the cooler temperature becomes equal to or lower than a certain temperature, the rotation speed of the compressor and the flow passage resistance value of the pressure reducing device are changed by the rotation speed and flow passage resistance value correcting means. With the correct cooling capacity to compensate It is possible to operate the compressor, prevent the operating efficiency from decreasing due to the cooler temperature when the electric damper etc. is operating, and improve the cooling system efficiency by optimizing the flow passage low resistance value corresponding to the change in compressor speed. Energy saving can be achieved by Furthermore, because the compressor speed can be corrected for each set temperature in the freezer compartment, no matter what the set temperature is set, the operating efficiency due to the overcooling of the cooler temperature during operation of the electric damper etc. Energy saving can be achieved by preventing the decrease and improving the efficiency of the cooling system by appropriately setting the flow passage resistance value corresponding to the change in the rotation speed of the compressor.

[Brief description of the drawings]

FIG. 1 is a block diagram of a refrigerator capacity control device according to a first embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation in FIG.

FIG. 3 is a characteristic diagram showing the operating speed of the compressor and the flow rate of the electric expansion valve 44, which are determined by the rotational speed and the flow rate calculating means in the present invention.

FIG. 4 is a block diagram of a conventional refrigerator capacity control device.

FIG. 5 is a characteristic diagram showing a difference in operating speed and a temperature difference of a compressor, which is determined by a speed calculating unit in a conventional example.

6 is a flowchart for explaining the operation in FIG.

[Explanation of symbols]

 13 cooler 17 compressor 18 electric damper 19 freezing room temperature sensor 21 freezing room temperature detecting means 22 freezing room temperature setting switch 23 freezing room temperature setting means 24 freezing room temperature difference calculating means 25 rotational speed and flow rate calculating means 26 inverter circuit 40 refrigeration Chamber operation control device 41 Rotation speed / flow rate correction means 42 Cooler temperature detection means 43 Cooler temperature sensor 44 Electric expansion valve (pressure reducing device) 45 Electric expansion valve control circuit

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masataka Oda 4-5 Takaida Hondori, Higashi-Osaka City, Osaka Prefecture Matsushita Refrigerator Co., Ltd. (72) Inventor Kenichi Morishita 4-chome Takaidamoto-dori, Higashi-Osaka City, Osaka Prefecture 2-5 Matsushita Refrigerator Co., Ltd. (72) Inventor Yasuki Hamano 4-2-5 Takaida Hondori, Higashi-Osaka City, Osaka Prefecture Matsushita Refrigerator Co., Ltd. (72) Inventor Shinichi Kanaoka Takaida Hondori, Higashi-Osaka City, Osaka Prefecture 4-2-5 Matsushita Refrigerator Co., Ltd. (72) Inventor Yoshitaka Kubota 4-2-5 Takaidahondori, Higashiosaka-shi, Osaka Prefecture Matsushita Refrigerator Co., Ltd. (72) Inventor Kazunori Kurimoto Takaida, Higashi-Osaka City, Osaka Prefecture 4-5-2 Hondori Matsushita Cold Machinery Co., Ltd.

Claims (2)

[Claims] 1. A room for storing food, an indoor temperature sensor provided in the room, an indoor temperature detecting means for detecting the indoor temperature by the indoor temperature sensor, and an indoor temperature for setting the indoor temperature. The setting means, the room temperature difference calculating means for calculating the difference between the room temperature detected by the room temperature detecting means and the room temperature set by the room temperature setting means, and the output of the room temperature difference calculating means The number of rotations of the compressor, the number of rotations for determining the flow path resistance value of the pressure reducing device, flow path resistance value calculating means, a cooler for evaporating the refrigerant compressed by the compressor to cool the room, and this cooler. The attached cooler temperature sensor, the cooler temperature detecting means for detecting the temperature of the cooler by the cooler temperature sensor, and the output from the cooler temperature detecting means The number of rotations, the number of rotations determined by the flow path resistance value calculating means, and the number of rotations for correcting the flow path resistance value,
A flow path resistance value correcting means, an inverter circuit for controlling the rotation speed of the compressor in accordance with the rotation speed and a command from the flow path resistance value correcting means, and a circuit for controlling the flow path resistance of the pressure reducing device. Characteristic refrigerator capacity control device. 2. A room for storing food, an indoor temperature sensor provided in the room, an indoor temperature detecting means for detecting the indoor temperature by the indoor temperature sensor, and an indoor temperature for setting the indoor temperature. The setting means, the room temperature difference calculating means for calculating the difference between the room temperature detected by the room temperature detecting means and the room temperature set by the room temperature setting means, and the output of the room temperature difference calculating means The number of rotations of the compressor, the number of rotations for determining the flow path resistance value of the pressure reducing device, flow path resistance value calculating means, a cooler for evaporating the refrigerant compressed by the compressor to cool the room, and this cooler. An attached cooler temperature sensor, a cooler temperature detecting means for detecting the temperature of the cooler by the cooler temperature sensor, a cooler temperature detecting means and the freezer compartment temperature setting means. The rotation speed determined by the flow path resistance value calculating means based on the output from the setting means, the rotation speed for correcting the flow path resistance value, the flow path resistance value correcting means, and the rotation speed and the flow path resistance A capacity control device for a refrigerator comprising an inverter circuit for controlling the rotation speed of the compressor according to a command from a value correction means, and a circuit for controlling a flow path resistance of the pressure reducing device.