JP2822719B2 - refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG.
FIG. 9 is an explanatory side view of a part of a conventional refrigerator-freezer disclosed in Japanese Patent Application Publication No. 9-No. 9 and 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 disposed therein. 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. When the temperature inside the refrigerator 1 detected by the refrigerator temperature detection sensor 9 becomes equal to or higher than a predetermined value, the microcomputer 1
0, the drive relay 8 is turned on to drive the compressor 5, and at the same time, the temperature of the compressor 5 rises excessively,
In order to prevent the life from being shortened, the blower 6 is driven to send cool 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 show, for example, Japanese Utility Model Laid-Open No. 63-17579.
FIG. 1 is a view showing a conventional refrigerator shown in Japanese Patent Publication No. 1 (hereinafter referred to as “No. 1”), in which 17 is an outer box of a refrigerator made of a steel plate, 18 is a front girder having both ends fixed to the outer box 17, and 19 is fixed on an upper surface of the front girder 18. The bottom plate, 20 is an evaporating dish housed under 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 at the lower rear of the bottom plate 19. A cover 23 is attached so as to be in close contact with the front spar 18 and the outer box in order to isolate sound, and a radiating pipe 23 extends from the side surface of the outer box 17 to the front portion of the bottom surface and is in close contact with the bottom plate 19. It is bent vertically from the side.
Reference numeral 24 denotes a heat conductive tape such as an aluminum tape having good heat conductivity, and the heat radiating pipe 23 is fixed to the bottom plate 19.

Next, the operation will be described. Since the front spar 18 is covered by the cover 22, the flow of air below the bottom plate 19 is poor. The defrost water collected in the evaporating dish 20 is turned into steam by the heat of the evaporating dish heat radiating pipe 21. When this water vapor contacts the relatively cooled bottom plate 19 due to heat conduction from inside the refrigerator, a dew phenomenon occurs on the lower surface of the bottom plate 19, particularly when air convection is poor, and the end of the bottom plate 19 or the front spar 18 is formed. Rust is generated at the edge portion, and dew attached to the bottom plate 19 and the like drops on the floor surface. However, the heat of the radiating pipe 23 crawled on the bottom plate 19 is transferred to the bottom plate 1 by the heat conductive tape 24.
Since it is effectively transmitted to 9 and the front girder 18, etc., it is difficult to dew. Also, when there is a blower 6 for cooling the compressor 5 as in the conventional refrigerator of the previous example, when the compressor is driven, there is convection of air because the blower 6 is driven, and the radiating pipe also has a temperature. Dew does not occur on the lower surface of the bottom plate because of the high pressure, but the operating rate of the compressor 5 is low, such as when the outside air temperature is low. When the compressor 5 is not driven, the blower 6 is not driven and the temperature of the radiating pipe is low. Since it is not so high, the heat of the heat radiating pipe may not be effectively transmitted to the bottom plate and the like and may be exposed to the bottom plate and the like depending on the variation in the method of applying the heat conductive tape.

[0004]

Since the conventional refrigerator is configured as described above, the operation rate of the compressor is low, for example, in low outside air, and the blower is not driven when the compressor is not driven. The convection of the air is poor, and there is a problem that rust is generated on the bottom plate or the edge of the front spar due to the dew on the bottom surface of the bottom plate or the like, and dew drops on the floor surface.

The present invention has been made in order to solve the above-mentioned problems. Even when the compressor is not operating, convection of air is generated near the bottom plate and rust is formed on the bottom plate and the front spar due to dew. It is intended to prevent generation and dew from dropping on the floor surface.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a refrigerator according to the present invention is provided at a bottom of a refrigerator main body, and has a top surface formed by a bottom plate of an outer box forming an outer shell of the main body. Chamber, a compressor provided in the machine room and compressing the refrigerant, a defrost water radiator provided in the machine room and radiating defrost water generated from the main body, and a compressor provided in the machine room and cooling the compressor A blower that suppresses water vapor generated from the defrosting water radiator from coming into contact with the bottom plate, and a control unit that drives the blower for a predetermined time when the outside air temperature is low after the operation of the compressor is provided. Was.

[0007]

[0008]

In the refrigerator according to the present invention, the blower is driven for a predetermined time even after the operation of the compressor is stopped to prevent the steam generated from the defrost water radiating device from contacting the bottom plate. In addition, the phenomenon of dew condensation on the bottom plate and the like is reduced.

[0009]

[0010]

【Example】

Embodiment 1 FIG. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 8a denotes a compressor driving relay, 1
0 is a microcomputer, 11 is a blower driving relay, 12, 13
Denotes a voltage dividing resistor of the inside temperature detecting sensor 9 and the outside air temperature detecting sensor 14, and 15 and 16 denote driving circuit portions of a compressor driving relay and a blower driving relay. In each figure,
The same or corresponding components as those in the conventional example are denoted by the same reference numerals, and the description thereof will not be repeated.

Next, the operation will be described with reference to the flowcharts of FIGS. FIG. 3 shows a main program, initial setting 101, internal temperature and outside air temperature input 102, a compressor control subroutine (SUB1) 103, a blower control subroutine (SUB2) 104, and step 10
Return to step 2 and repeat. FIG. 4 is a flowchart of the compressor control subroutine (SUB1). If the internal temperature 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 determined whether the outside air temperature is high. If the temperature is high, the process proceeds to step 220. If the compressor 5 is turned on, the blower 5 is turned on by the blower drive relay 11 to cool the compressor 5. . Conversely, 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). Conversely, when the compressor 5 is off, the process proceeds to a subroutine (SUB3) of step 280. Note that S
After proceeding to steps 230, 250, and 270 other than UB3, 1 is set to the initial flag F. FIG. 6 shows a flowchart of step 280 (SUB3) in FIG. At step 310, it is determined whether or not 1 is set in the initial flag F. Initial flag F when 1 is set
Is set to 0 (step 320), the timer T is reset and started (step 370), and the routine returns. Initial flag F to compare the timer T phrase predetermined time T ₁ proceeds to step 330 if 0. If T ₁ has not elapsed to return. For T> T _1, the blower 6 is ON 340, it compares whether a predetermined time T ₂ has elapsed is T ₁ at step 350. If the T ₂ has not elapsed to be directly returned. T> In the case of T ₂ a blower 6 OF
F (step 360), proceed to step 370, reset the timer T again, and return. The above cycle is repeated, and the cooling operation is performed.

As described above, in the first embodiment, if the compressor 5 is ON when the outside air temperature is high, the blower 6 is driven for cooling the compressor. Conversely, when the outside air temperature is low, the blower 6 is driven for a certain period of time when the compressor 5 is turned off. That is, when the outside air temperature is low, the convection of air is generated near the bottom of the refrigerator by the blower 6 to prevent the air from dewing on the bottom plate 19 and the like.

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

Embodiment 3 FIG. Further, in the second embodiment, the ON / OFF control of the blower 6 is performed based on the outside air temperature.
N / OFF control may be performed.

Embodiment 4 FIG. Further, according to the first to third embodiments, the convection of the air on the bottom surface of the refrigerator is improved even in low outside air, so that it is difficult for the bottom plate 19 to dew. This eliminates the need to transfer the heat of the heat radiating pipe 23 to the bottom plate 19, and
It is also possible to eliminate the heat dissipating pipe 23 and the heat conductive tape 24 attached thereto.

Embodiment 5 FIG. Hereinafter, a fifth embodiment of the present invention will be described with reference to FIGS. FIG. 8 is an overall configuration diagram of Embodiment 5 of the refrigerator according to the present invention. 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 refrigerator for guiding a part of the cool air to the refrigerator compartment 34. The room air passage 36 opens and closes the air passage 35 to open the refrigerator compartment 3.
Damper to control cold air to 4; 7 is cooler 2
, A defrosting heater 39 for detecting the temperature of the freezer compartment 38, an R thermistor 40 for detecting the temperature of the refrigerator compartment 34, a fan 6 for the machine room, and a 43 for terminating the defrosting. D for detecting the temperature of the cooler 32
The EF thermistor 44 is a control board for controlling the whole refrigerator, where 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 and 50 as means for turning on and off the power supply 47 of the electric components, and these are contact points for turning on / off the compressor 5, the fan 33, the damper 36 and the machine room fan, respectively. This contact
The coils are driven by coils 51, 52, and 53, respectively, and energization of these coils is performed by drive circuits, 55, and 56. Which of these is energized is determined by the microcomputer. The thermistors 39, 40, 42 and 43 are input to the microcomputer 10. Here, 28 to 31 are voltage dividing resistors which divide the voltage between the thermistor and the voltage.

Next, the configuration of the machine room fan operation control determining means 46 will be described with reference to FIG. The operating state of the compressor 5 is detected by the compressor operating state detecting means 65, and it is determined that the operation is switched from stop to operation. The timer is counted by the timer 66 from the time when the compressor 5 enters the operating state, and the machine room fan operation determining means 67 determines the final control of the mechanical fan from the time.

Next, the contents of the machine room fan operation control determining means 46 will be described in detail with reference to a flowchart of FIG. First, at step 460, the operation state of the compressor is detected. While the compressor 5 is stopped, the machine room fan 6 is stopped. Next, while the compressor 5 is operating, the machine room fan 6 is operated within t1 hours after the compressor operation in step 461. Next, at step 462, if the time is t1 or more and t2 or less, the machine room fan 6 is stopped, and if it is t2 or more, the machine room fan 6 is operated. Machine room fan 6
Is mounted as shown in FIG. 12, and the air stirred by the machine room fan 6 flows through the machine room 4,
The steam that has risen as steam from the defrost water (drain) of the cooler 32 accumulated in the evaporating dish 20 shown in FIG.
The temperature of the compressor 5 is reduced while preventing condensation as water drops.

[0020]

In the refrigerator according to the present invention, when the outside air temperature is low even after the operation of the compressor is stopped , the blower is driven for a predetermined time to generate convection of air near the bottom of the refrigerator, thereby generating the heat from the defrost water radiating device. By preventing the generated steam from coming into contact with the bottom plate, it is possible to suppress dew condensation on the bottom plate and the like.

[0021]

[Brief description of the 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 flowchart illustrating an operation of the refrigerator according to the first embodiment of the present invention.

FIG. 4 is a flowchart illustrating an operation of the refrigerator according to the first embodiment of the present invention.

FIG. 5 is a flowchart illustrating the operation of the refrigerator according to the first embodiment of the present invention.

FIG. 6 is a flowchart illustrating an 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 Embodiment 5 of the present invention.

FIG. 9 is a circuit diagram of a refrigerator according to Embodiment 5 of the present invention.

FIG. 10 is a configuration diagram of a refrigerator according to Embodiment 5 of the present invention.

FIG. 11 is a flowchart illustrating the operation of a refrigerator according to Embodiment 5 of the present invention.

FIG. 12 is a partial perspective view of a main part of a refrigerator according to Embodiment 5 of the present invention.

FIG. 13 is a sectional view of a main part of a refrigerator according to Embodiment 5 of the present invention.

FIG. 14 is an explanatory side view partially cut away 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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F25D 21/04 F25D 11/00 101 F25D 21/14

Claims (1)

(57) [Claims] A machine room provided at a bottom of a refrigerator body, a top surface formed of a bottom plate of an outer box forming an outer shell of the body; a compressor provided at the machine room, for compressing a refrigerant; A defrost water radiator provided in the machine room and radiating defrost water generated from the main body, and provided in the machine room to cool the compressor,
A blower that suppresses water vapor generated from the defrost water radiator from coming into contact with the bottom plate, and a control unit that drives the blower for a predetermined time when the outside air temperature is low after the operation of the compressor is stopped. A refrigerator comprising: