JPH04198683A - Refrigerator - Google Patents

Abstract

PURPOSE:To maintain excellent control accuracy of a temperature in a refrigerator by a method wherein the refrigerator is provided with a cold air inlet port, communicated with a duct guiding the cold air from an evaporator, and a cold air outlet port, communicated with a refrigerating chamber or a vegetable chamber, while a cold air flow rate controller is arranged in the duct of the refrigerator. CONSTITUTION:The outlet port of cold air 15a is communicated with a refrigerating chamber 3b while the outlet port of cold air 15b is communicated with a vegetable chamber 3c and, therefore, the damper unit 19b of a rotor 19 is stopped at a position whereat the inlet port of cold air 14 for a housing 10 is blockaded to blockade the inflow of the cold air through a discharging port of the cold air when the temperatures of both chambers 3b, 3c are low. According to this operation, the entering of the cold air is precluded by the inlet port of cold air 14 and hot air in a refrigerator tries to flow reversely into a cold air flow rate limiting device 7 through ducts 6a, 6b, however, a distance from the inside of a refrigerator is long and, therefore, reverse flow will never be occurred. Accordingly, warm air in the refrigerator is seldom contacted with the cold air in the cold air inlet port 14 whereby dewing or freezing is hardly generated. According to this method, the accuracy of temperature control in the refrigerator can be kept well.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a refrigerator having a cold air flow rate control device that controls the amount of cold air admitted from a cold air discharge port.

(Prior Art) Conventionally, as means for controlling the internal temperature of a refrigerator, a cold air inlet for introducing cold air generated by an evaporator of the refrigerator into the refrigerator is controlled by gas pressure type or electric type cold air flow rate control. It was opened and closed by a device and controlled.

Generally, the cold air flow control device is installed on the side of the cold air outlet into the refrigerator, so for example, if the temperature inside the refrigerator continues to be sufficiently low for a long time, the cold air inlet of the cold air flow control device will remain closed. Around the inlet, there is cold air from the evaporator on one side, and slightly warm air from inside the refrigerator on the other side.
Warm air and cold air come into contact with each other through the intake opening/closing plate, causing frost and ice to form easily, which sometimes makes it impossible to control the flow rate of cold air.

As a countermeasure, we installed a heater around the inlet, and
As typified by Japanese Patent Application Laid-Open No. 62-52281, a control method was adopted in which a cold air flow rate control device was forcibly activated if the cold air flow rate control was in a closed state for a certain period of time, regardless of the temperature inside the refrigerator. .

(Problem to be solved by the invention) However, for example, if a heater is installed to prevent freezing, it will result in a loss of energy, increase the cost of wiring for installing the heater, etc., and forcefully control the flow rate of cold air. Operating the device has problems such as lowering the accuracy of the temperature inside the refrigerator.

The present invention solves the above-mentioned problems, and aims to provide a refrigerator controlled by a cold air flow rate control device, which is economical with little energy loss, and does not reduce the accuracy of internal temperature.

(Means for Solving the Problems) The present invention achieves the above object by providing a cold air inlet portion communicating with a duct for guiding cold air from an evaporator, and one or two cold air outlet portions communicating with a refrigerator compartment or a vegetable compartment. A cold air flow rate control device comprising a housing provided with a rotor, a rotor that rotates inside the housing and can selectively open or close one of the cold air inlet portion or the cold air outlet portion, a driving source thereof, and a means for detecting the position of the rotor. The device is achieved by a refrigerator arranged in the said duct of the refrigerator.

(Function) According to the present invention having the above configuration, warm air from inside the warehouse does not reach the cold air flow rate control device disposed in the duct, and therefore condensation or A refrigerator that can economically prevent freezing, etc.

(Example) Hereinafter, the present invention will be explained with reference to examples and drawings.

- Figures 1 and 2 show an embodiment of the present invention in a vertical sectional view and a front view of a refrigerator, and the inside of the refrigerator is divided into partition plates 1 and 2.
It is divided into a freezer compartment 3a, a refrigerator compartment 3b, and a vegetable compartment 3C. 4 is an evaporator that constitutes a refrigeration cycle;
The cold air generated thereby is transferred to the freezer compartment 3a by the fan 5.
The air is then sent through a square duct 6 to the refrigerator compartment 3b and vegetable compartment 3c while being controlled by a cold air flow rate control device 7 installed inside the duct 6.

One cold air outlet section of the cold air flow rate control device 7 communicates with the refrigerator compartment 3b through a duct 6a, and the other cold air outlet section communicates with the vegetable compartment 3c through a duct 6b. 8 is a refrigerant compressor.

FIG. 3 is an exploded perspective view of the cold air flow rate control device 7 described above. In the figure, lO is an angular housing with dimensions suitable for the above-mentioned duct, with a cylindrical protrusion in the center.
1 is formed, an annular recess 12 is provided around it, and protrusions 13a, 13b,
13c, and a cold air inlet portion 14 is formed between the protrusions 13a and 13b and communicates with the duct 6. Also,
Cold air outlet portions 15a and 15b are formed at respective positions rotated by 90 degrees from the cold air inlet portion 14.

Here, the cold air outlet portion 15a connects to the refrigerator compartment 3b via the duct 6a as described above, and the cold air outlet portion 15b connects to the duct 6b.
It communicates with the vegetable compartment 3c through.

The cylindrical projection 11 is hollow, and inside the hollow is a motor 16 as a drive source and its output gear 1.
6a, which are held by a disc 17, and the disc 17 is provided with a reduction gear group 18 that meshes with the output gear 16a, and the final stage 18a of the reduction gears is
It protrudes from a hole 11a provided in the cylindrical projection 11. Further, a rotor 19 is rotatably provided on the outer periphery of the cylindrical projection 11, and rotates within a hollow cylindrical portion 19a that fits with the cylindrical projection 11 and an annular recess 12 of the housing IO. A damper portion 19b having dimensions that close the cold air inlet portion 14 and the two cold air outlet portions 15a and 15b extends radially from the hollow cylindrical portion 19a. The hollow cylindrical portion 19a is provided with a gear portion 1 so as to mesh with the final stage 18a of the gear group of the motor 16.
9c is provided. Further, the rotor 19 is rotatably held by a pin 20 held by the cylindrical projection 11 of the housing 10. A magnet 21 is embedded in the bottom side of the damper portion 19b of the rotor 19, and the magnet 21 passes through as the rotor 19 rotates. A reed switch 22 is embedded in the housing bottom surface 10a of the cold air inlet portion 14 of the housing 10. Reed switch 22 is connected to an external control circuit (not shown). A cover 23 of the housing 10 is attached to the top side of the housing 10 with screws 24.

The present invention is configured as described above and operates as follows.

First, when a signal is applied from a control circuit (not shown), the motor 16 rotates and is passed through the reduction gear group 18 to the final stage 18.
Rotation is transmitted from a to the rotor 19, and the rotor 19 rotates within the annular recess 12 of the housing IO. Here, the origin of the rotational position of the rotor 19 is determined by the fact that when the damper part 19b closes the cold air inlet part 14 of the housing 10, the reed switch 22 embedded in the housing bottom surface 10a is turned on, and an external control (not shown) The cold air outlet section 15a detected by inputting it into the circuit communicates with the refrigerator compartment 3b, and the cold air outlet section +5b communicates with the vegetable compartment 3c, so when the temperature in both compartments is low, the damper part 19b of the rotor I9 stops at a position that closes the cold air inlet portion 14 of the housing IO,
The inflow of cold air from the cold air outlet is blocked (Fig. 4).

As a result, the cold air is blocked from entering by the cold air inlet 14, and the warm air inside the refrigerator tries to flow back to the cold air flow control device 7 through the ducts 6a and 6b (Fig. 1), but the distance from the inside of the refrigerator is long. Therefore, there will be no backflow. Therefore, the warm air inside the refrigerator rarely comes into contact with the cold air in the cold air inlet section 14.
This makes it difficult for condensation and freezing to occur. In addition, when only the vegetable compartment 3c has a high temperature and only the refrigerator compartment 3b has a low temperature, or when only the vegetable compartment 3C has a low temperature and only the refrigerator compartment 3b has a high temperature, the rotor 19 is rotated 90° or 270°,
What is necessary is just to close the cold air outlet part 15a to b or the cold air outlet part 15b to the vegetable compartment 3C. In this case, since the cold air flows from the cold air inlet section 14 to one cold air outlet section 15a or +5b, freezing and condensation are unlikely to occur (FIG. 5).

As described above, the present invention provides a cold air inlet section and two cold air outlet sections in the same angular housing, is rotatably held within the housing, and detects the cold air inlet section and the two cold air outlet sections. A cold air flow control device is installed in the duct of the cold air passage, and has a rotor that can detect the cold air and open and close each cold air inlet and cold air outlet sequentially. Even if the hot air flows backward through the duct 6 from inside the refrigerator, it does not reach the cold air joint of the rotor 19 at the cold air inlet, and therefore, condensation and freezing on the rotor 19 is suppressed.

(Effects of the Invention) As is clear from the above description, the present invention provides a housing provided with one or two cold air outlet portions communicating with a cold air inlet portion;
A cold air flow control device consisting of a rotor that rotates inside the rotor and can open and close one of the cold air inlet section or the cold air outlet section, a drive source thereof, and means for detecting the rotor position is installed in the cold air duct of the refrigerator. The cold air inlet is connected to the evaporator and the cold air outlet is connected to the refrigerator or vegetable compartment.
Even if the rotor blocks the cold air inlet for a long period of time, the cold air junction will be different from the warm air flowing back through the duct from inside the refrigerator.
Because the duct distance is long, there is no contact, so this refrigerator does not cause condensation or freezing of the rotor.It economically eliminates condensation and freezing without using a heater, etc., and has the advantage of good temperature control accuracy. Therefore, you can put it into practice and get great results.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a refrigerator according to an embodiment of the present invention, FIG. 2 is a front view of FIG. FIG. 5 is a schematic diagram showing the state of the cold air flow rate control device of FIG. 3. 4...Evaporator, 6...Duct, 7...
Cold air flow control device, 1o...housing, 14...
Cold air inlet section, +5a, 15b...cold air outlet section, 1
6... Motor (drive source), 19... Rotor, 22...
... Reed switch (position detection means).

Claims (1)

[Claims] A housing having a cold air inlet communicating with a duct for guiding cold air from the evaporator, and one or two cold air outlet communicating with a refrigerator compartment or a vegetable compartment; Alternatively, a cold air flow rate control device comprising a rotor capable of selectively opening and closing one of the cold air outlet portions, a driving source thereof, and means for detecting the rotor position is disposed in the duct of the refrigerator. Refrigerator.