JPH0587432A - Refrigerator - Google Patents

Abstract

PURPOSE:To prevent condensation on a bottom plate and front frames of a refrigerator which has a compressor and a cooling fan for the compressor, by a method wherein the fan is controlled so that it is operated for a given time period to generate an airflow around the bottom of the refrigerator even while the compressor is out of operation. CONSTITUTION:On receipt of detected signals from a compartment temperature sensor 9 and an outside temperature sensor 14, a microcomputer 10 turns a compressor 5 on when the compartment temperature is high and turned it off when the compartment temperature is low. When the compressor 5 is turned on, a fan 6 is turned on by a fan driving relay 11 to cool the compressor 5, and when the compressor is turned off, the fan 6 is turned off. When the outside temperature is low, the fan 6 is turned off even while the compressor 5 is on. When the compressor 5 is turned off, a timer is reset and started, and when the set time period of the timer has elapsed, the fan 6 is operated for a given time period to generate an airflow around the bottom of a refrigerator for preventing condensation on a bottom plate 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive control of a refrigerating refrigerator, particularly a blower for cooling an electric compressor.

[0002]

2. Description of the Related Art FIG. 14 shows, for example, Japanese Utility Model Laid-Open No. 55-11446.
9 is a side cutaway side view of the conventional refrigerator-freezer shown in Japanese Patent Publication No. 9 and FIG. 15 is a circuit view of the conventional example of FIG. In FIG. 14, 1 is a main body of a refrigerator-freezer (hereinafter referred to as a refrigerator), 2 is a back wall of the main body 1, 3 is a machine room cover, and 4 is an electric compressor (hereinafter referred to as a compressor) and a blower 6 are installed therein. A machine room, 5 is a compressor with high pressure inside the shell, 6
Is a blower for cooling the compressor 5. In FIG. 15, 7 is a power source, 8 is a relay for driving the compressor 5 and the blower 6, 9 is a sensor for detecting the temperature inside the refrigerator 1, and 10 is a microcomputer (hereinafter referred to as a microcomputer) which is a control device for controlling these operations. ). Next, the operation of the conventional refrigerator will be described with reference to FIGS. 14 and 15. In order to cool the inside of the refrigerator 1 when the temperature inside the refrigerator 1 detected by the inside temperature detection sensor 9 exceeds a predetermined value, the microcomputer 1
By the control of 0, the drive relay 8 is turned on to drive the compressor 5, and at the same time, the temperature of the compressor 5 excessively rises,
In order to prevent the life of the compressor from being shortened, the blower 6 is driven to send cold air to cool the compressor 5. The front side of the bottom surface of the conventional refrigerator will be described with reference to FIGS. 16 and 17. FIGS. 16 and 17 show, for example, Shoukai 63-17579.
It is a figure which shows the conventional refrigerator shown by the 1st publication, 17 is an outer box of the refrigerator which consists of steel plates in the figure, 18 is the front girder which fixed both ends to the outer box 17, 19 is fixed to the upper surface of the front girder 18. Bottom plate, 20 is an evaporating dish stored in the lower part of the bottom plate 19, 21 is an evaporating dish radiating pipe mounted on the lower surface of the evaporating dish 20, and 22 is generated from a compressor (not shown) installed in the lower rear part of the bottom plate 19. A cover is attached so as to be in close contact with the front girder 18 and the outer box for sound insulation, and 23 is a heat radiating pipe that extends from the side surface of the outer box 17 to the front part of the bottom surface and is in close contact with the bottom plate 19. It is bent vertically from the side.
Reference numeral 24 is a heat conductive tape such as an aluminum tape having good heat conductivity, and fixes the heat radiation pipe 23 to the bottom plate 19.

Next, the operation will be described. Since the front girder 18 is covered with the cover 22, the air flow under the bottom plate 19 is poor. The defrosting water collected in the evaporating dish 20 becomes steam by the heat of the evaporating dish radiating pipe 21. When this water vapor comes into contact with the relatively cooled bottom plate 19 due to heat conduction from the inside of the refrigerator, especially when the convection of the air is bad, a dew condensation phenomenon occurs on the lower surface of the bottom plate 19 or the end of the bottom plate 19 or the front girder 18. Although rust is generated at the edges and dew attached to the bottom plate 19 or the like drops onto the floor surface, the heat of the heat dissipation pipe 23 crawling on the bottom plate 19 is transferred to the bottom plate 1 by the heat conductive tape 24.
9 and the front girder 18 are effectively transmitted, so that it is difficult for the dew to land. Further, when there is a blower 6 for cooling the compressor 5 like the conventional refrigerator of the previous example, when the compressor is driven, there is air convection because the blower 6 is driven and the heat radiation pipe also has a temperature. However, when the outside air temperature is low, the operation rate of the compressor 5 is low, and when the compressor 5 is not driven, the blower 6 is not driven and the heat radiation pipe has a high temperature. Since it is not so high, the heat of the radiating pipe may not be effectively transmitted to the bottom plate and the like, and may be condensed on the bottom plate and the like, depending on variations in the method of applying the heat conductive tape.

[0004]

Since the conventional refrigerator is constructed as described above, the operation rate of the compressor is low when the outside air is low, and the blower is not driven when the compressor is not driven. There was a problem that the convection of air was bad and that the dew was deposited on the lower surface of the bottom plate and the like, rust was generated on the bottom plate and the edge part of the front girder, and the dew dripped on the floor surface.

The present invention has been made in order to solve the above-mentioned problems. Even when the compressor is not driven, air convection can occur near the bottom plate, and the bottom plate and the front girders are exposed to rust. The purpose is to prevent the generation and dew drop on the floor surface.

[0006]

[Means for Solving the Problems] Claim 1 according to the present invention
The refrigerator of (1) includes a compressor and a blower that cools the compressor, and includes a control unit that controls the fan to be driven for a certain set time even when the compressor is stopped.

According to a second aspect of the present invention, in a refrigerator having a compressor and a blower for cooling the compressor, the compressor is operated at the same time as the blower is operated for a certain period of time, and then, for a certain period of time. A control means for stopping the blower and then operating the blower again is provided.

[0008]

In the refrigerator according to the first aspect of the present invention, the phenomenon of dew condensation on the bottom plate and the like disappears when the outside air temperature is low.

In the refrigerator according to the second aspect of the present invention, the dew on the bottom plate can be removed.

[0010]

EXAMPLES Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 and 2, 8a is a compressor drive relay, 1
0 is a microcomputer, 11 is a blower drive relay, 12, 13
Are voltage dividing resistors of the inside temperature detection sensor 9 and the outside air temperature detection sensor 14, and 15 and 16 are drive circuit portions of the compressor drive relay and the blower drive relay. In each figure,
The same or corresponding components as in the above-mentioned conventional example are represented by the same reference numerals, and duplicate description will be omitted.

Next, the operation will be described with reference to the flowcharts of FIGS. FIG. 3 shows a main program, which performs initial setting 101, internal temperature and outside air temperature input 102, compressor control subroutine (SUB1) 103, and blower control subroutine (SUB2) 104, and step 10
Return to 2 and repeat. FIG. 4 is a flowchart of the compressor control subroutine (SUB1). If the temperature inside the refrigerator is high, the compressor 5 is turned on (steps 110 and 12).
0), if the internal temperature is low, the compressor 5 is turned off (steps 130 and 140), and the process returns to the main program. FIG. 5 shows a flowchart of the blower 6 control subroutine (SUB2). First, in step 210, it is compared whether or not the outside air temperature is high, and when it is high, the process proceeds to step 220, and when the compressor 5 is turned on, the blower 5 is turned on by the blower drive relay 11 in order to cool the compressor 5. .. On the contrary, when the compressor 5 is off, the blower 6 is turned off.
If the outside air temperature is low in step 210, step 2
If the compressor 5 is on at 60, the blower 6 is turned off (step 270). On the contrary, when the compressor 5 is off, the process proceeds to the subroutine (SUB3) of step 280. Note that S
After proceeding to steps 230, 250 and 270 other than UB3, the initial flag F is set to 1. FIG. 6 shows a flowchart of step 280 (SUB3) in FIG. At step 310, it is checked whether the initial flag F is set to 1. Initial flag F if 1 is set
Is set to 0 (step 320), the timer T is reset and started (step 370), and the process returns. If the initial flag F is 0, the process proceeds to step 330 and the timer T is compared with a certain time T ₁ . If T ₁ has not elapsed, the process returns. If T> T ₁ , the blower 6 is turned on 340, and in step 350 it is compared whether T ₁ has passed a certain time T ₂ . If T ₂ has not elapsed, return as it is. If T> T ₂ , blower 6 is OF
F (step 360) The process proceeds to step 370, resets and starts the timer T again, and returns. The cooling operation is performed by repeating the above cycle.

As described above, in the first embodiment, the blower 6 is driven to cool the compressor 5 when it is turned on when the outside air temperature is high. On the contrary, when the outside air temperature is low, the blower 6 is driven for a certain time when the compressor 5 is off. That is, when the outside air temperature is low, the blower 6 prevents convection of air near the bottom surface of the refrigerator and prevents the dew condensation on the bottom plate 19 or the like.

Embodiment 2. In the first embodiment, when the outside air temperature is low, the microcomputer 10 turns the blower 6 on and off at a certain timing only when the compressor 5 is off.
However, the blower 6 may be turned on or off regardless of whether the compressor 5 is turned on or off.

Example 3. Although the blower 6 is controlled to be turned on / off by the outside air temperature in the second embodiment, the blower 6 is always turned off when the compressor 5 is stopped regardless of the outside air temperature.
N / OFF control may be performed.

Example 4. Further, according to the first to third embodiments, the convection of the air on the bottom surface of the refrigerator is improved even when the outside air is low, so that it is difficult for the bottom plate 19 to be exposed to dew. Therefore, it is not necessary to transfer the heat of the heat radiation pipe 23 to the bottom plate 19, so that the bottom plate 1
The heat dissipating pipe 23 and the heat conducting tape 24 to which it is attached can be eliminated.

Embodiment 5. The fifth embodiment of the present invention will be described below with reference to FIGS. FIG. 8 is an overall configuration diagram of a fifth embodiment of the refrigerator according to the present invention. Reference numeral 5 is a compressor for compressing and circulating the refrigerant, 32 is a cooler for evaporating the refrigerant, 33 is a fan for circulating the cool air cooled by the cooler 32, and 35 is a refrigerating unit for guiding a part of the cool air to the refrigerating chamber 34. The air duct, 36 opens and closes the air duct 35, and the refrigerator compartment 3
Damper that controls cold air to 4, 7 is cooler 2
A defrosting heater for defrosting the frost, 39 is an F thermistor for detecting the temperature of the freezer compartment 38, 40 is an R thermistor for detecting the temperature of the refrigerating compartment 34, 6 is a machine room fan, and 43 is for ending the defrosting. D for detecting the temperature of the cooler 32
The EF thermistor 44 is a control board for controlling the entire refrigerator, and the control board 44 includes a control means 45 and a control method determination 46.

Next, the contents of the control means 45 will be described with reference to FIG. In FIG. 9, there are switches 48, 49, 50 as means for turning on / off the power supply 47 of the electric parts, which are contacts for turning on / off the compressor 5, the fan 33, the damper 36, and the machine room fan, respectively. This contact is
The coils 51, 52, and 53 are driven, and the coils are energized by drive circuits 54, 55, and 56, and which of these is energized is determined by 10 microcomputers. The thermistors 39, 40, 42 and 43 are inputs to the microcomputer 10. Here, 28 to 31 are voltage divider resistors for dividing the voltage with the thermistor.

Next, the construction of the machine room fan operation control determining means 46 will be described with reference to FIG. The compressor operating state detecting means 65 detects the operating state of the compressor 5 and determines that the operation is switched from stop to operation. The timer 66 counts the timer from the time when the compressor 5 is in the operating state, and the machine room fan operation determining means 67 determines the final control of the mechanical fan from that time.

Next, the contents of the machine room fan operation control determining means 46 will be described in detail with reference to FIG. First, in step 460, the operating state of the compressor is detected. The machine room fan 6 is stopped while the compressor 5 is stopped. Next, while the compressor 5 is operating, the machine room fan 6 is operated within t1 hours after the compressor is operated in step 461. Next, at step 462, if t1 hours or more and t2 hours or less, the machine room fan 6 is stopped, and if t2 hours or more, the machine room fan 6 is operated. Machine room fan 6
Is installed as shown in FIG. 12, and the agitated air is circulated in the machine room 4 by the machine room fan 6,
The steam rising from the defrosting water (drain) of the cooler 32 accumulated in the evaporation tray 20 shown in FIG.
The temperature of the compressor 5 is lowered while preventing dew condensation as water droplets.

[0020]

The present invention has the following effects.
The refrigerator according to claim 1, wherein the refrigerator includes a compressor and a blower that cools the compressor, and a control unit that controls the blower to be driven for a certain set time even when the compressor is stopped. As a result, the phenomenon of dew condensation on the bottom plate and the like disappears when the outside air temperature is low.

According to a second aspect of the present invention, in a refrigerator having a compressor and a blower for cooling the compressor, the compressor is operated, the blower is operated for a certain period of time, and then the blower is stopped for a certain period of time. After that, since the control means for operating the blower again is provided, the dew on the bottom plate can be removed.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a refrigerator according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of the refrigerator according to the first embodiment of the present invention.

FIG. 3 is a flow chart for explaining the operation of the refrigerator according to the first embodiment of the present invention.

FIG. 4 is a flow chart for explaining the operation of the refrigerator according to the first embodiment of the present invention.

FIG. 5 is a flow chart for explaining the operation of the refrigerator according to the first embodiment of the present invention.

FIG. 6 is a flow chart for explaining the operation of the refrigerator according to the first embodiment of the present invention.

FIG. 7 is an ON / OFF timing diagram of the compressor and the blower of the refrigerator according to the first embodiment of the present invention.

FIG. 8 is an overall configuration diagram of a refrigerator according to a fifth embodiment of the present invention.

FIG. 9 is a circuit diagram of a refrigerator according to a fifth embodiment of the present invention.

FIG. 10 is a configuration diagram of a refrigerator according to a fifth embodiment of the present invention.

FIG. 11 is a flow chart for explaining the operation of the refrigerator according to the fifth embodiment of the present invention.

FIG. 12 is a partial perspective view of a main part of a refrigerator according to a fifth embodiment of the present invention.

FIG. 13 is a cross-sectional view of essential parts of a refrigerator according to a fifth embodiment of the present invention.

FIG. 14 is a partially cutaway side view of a conventional refrigerator.

FIG. 15 is a circuit diagram of a conventional refrigerator.

FIG. 16 is an enlarged perspective view of a main part of a conventional refrigerator.

FIG. 17 is an enlarged sectional view of a conventional refrigerator.

[Explanation of symbols]

 5 Compressor 6 Blower 10 Microcomputer

Claims (2)

[Claims] 1. A refrigerator having a compressor and a blower for cooling the compressor, the refrigerator having control means for controlling the blower to be driven for a certain set time even when the compressor is stopped. 2. In a refrigerator having a compressor and a blower for cooling the compressor, the compressor is operated at the same time, the blower is operated for a certain period of time, and then the blower is stopped for a certain period of time, and then the blower is again used. Refrigerator equipped with a control means for operating the.