JPS6399476A - Method of controlling refrigerator - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for controlling a refrigerator equipped with an electric damper device that is controlled to either open or close by an electric signal.

(b) Conventional technology The system is equipped with a freezer compartment and a refrigerator compartment, and operates a compressor and a blower based on the temperature of the freezer compartment, and operates a damper device based on the temperature of the refrigerator compartment to supply air to the refrigerator compartment. Cold air inflow I
In the refrigerator that adjusts the temperature, the damper device may be a gas-type damper device whose driving source is a change in the pressure of the sealed gas, an electromagnetic damper device whose driving source is an electromagnet, or a motor-type damper device whose driving source is a pulse tanabata. There are things etc. A gas-type damper device opens or closes the baffle plate based on changes in the pressure of the filled gas, but because the pressure changes in the filled gas are slow, the baffle plate may become half-open, causing damage to the refrigerator compartment. There is a problem that accurate temperature control cannot be expected. Therefore, as a means to solve this problem,
The electromagnetic damper device shown in Publication No. 7 and the Utility Model No. 60-
It is proposed to use a motor type damper device as shown in Japanese Patent No. 2271. Both the electromagnetic type and motor type damper devices are controlled to be turned on and off, that is, opened and closed, by electric signals, and are suitable for controlling the temperature of a refrigerating room because of their quick response to electric signals.

(/] Problems to be Solved by the Invention According to the above-mentioned conventional technology, both the electromagnetic type and motor type damper devices completely block the outlet for cold air to the refrigerator compartment in their closed states, and the cooler Because the cooling room in which the refrigerator is installed is isolated from the refrigerator room, it remains closed for a long time when the outside temperature is low, such as in the winter. The cold air that stays near the damper device must be cooled down to below 0°C due to the influence of the cold air in the cooling room, and as a result, frost or icing occurs from the buckle plate to the wall of the refrigerator room. Due to frost or ice, a problem arises in that the damper device cannot be moved from the closed state to the open state, that is, it malfunctions.

In order to solve the above-mentioned problems, the present invention is equipped with a freezer compartment inlet and a refrigerator compartment fR1, and operates the compressor (1) and the blower (121) based on the temperature of the freezer compartment inlet. Based on the temperature of the refrigerator compartment entrance, the temperature of the refrigerator compartment (
The amount of cold air entering R1 is adjusted to maintain the refrigerator compartment (R1) within the set temperature range, and the damper is forcibly operated for a short time when the compressor is driven regardless of the temperature of the refrigerator compartment fR1. With the device aη open, low-temperature, humid cold air is pumped into the cooling room (
8) From the refrigerator room (5) to the refrigerator (1)
provides a control method.

(e) According to the working example, when the compressor (1) is driven, regardless of the temperature at the opening of the refrigerator compartment, the damper device (1η) is forced to open, and the cooling compartment (8) The high-humidity cold air that has accumulated in the vicinity of the damper device αD can be removed by the low-temperature, humid cold air that is supplied for a short time to the refrigerator compartment through the discharge port a9.

(F) Embodiment An embodiment will be explained with reference to the drawings. FIG. 2 shows a refrigerator-freezer (1) as an example. (2) is a heat insulating body, and the inside of the refrigerator is divided into upper and lower parts by a heat insulating partition wall (3), with a freezer compartment [F] serving as the first compartment at the top and a refrigerator compartment opening serving as the second compartment at the bottom. are divided into sections. (61
, t7) is an insulated door that separately opens and closes the front opening of the freezer compartment and the refrigerator compartment (partition wall (3)).
A cooling chamber (8) is formed inside, and a cooler αQ included in the refrigeration cycle is housed and installed inside. A cooling chamber (8) and both chambers (Fl (duct communicating with R1) ell) are formed in the back of the cooler αQ, and this duct Ql
The air cooled by the cooler α [that is, the cold air] is sucked into the blower α2 located inside the duct Q1, and is forcibly blown out into the duct Q1. (12M) is a motor that drives the blower α2. The cold air blown into the duct (ill) is blown into the freezer compartment through the outlet (141) and into the refrigerator compartment (R1) through the outlet α9. A motor-type damper device installed in the refrigerator compartment (R1) opens and closes the discharge port α$ by means of a buckle plate α mark that can be rotated in the front and rear directions based on the temperature in the refrigerator compartment +R1. ℃ and +3℃ to an average of +5℃. This is an electric compressor included in the refrigeration cycle shown in Figure 1.In the machine room Q1) there is a condenser (c) also included in the refrigeration cycle, and a cooling device for this condenser and the electric compressor mentioned above. A blower @ is installed. Note that (5) is the operation panel attached to the front of the door (6). Also, the one shown in FIG.

The damper device (1η includes the buckle plate (1 to 1, as well as a drive source 04 consisting of an AC motor and a gear mechanism),
By applying an electric signal to this drive source 04), the AC motor is rotated to open or close the baffle plate α. As shown in FIG. 4, on the back surface of the baffle plate αψ, a sealing member (to) made of foamed polyethylene and also serving as a buffer member is provided, which improves the sealing performance when the baffle plate Q8 is in the closed state, and also improves the sealing performance of the buckle plate Q8. (It is designed to reduce the impact when the damper device Q is closed. (E) is a resin case that covers the heat insulating cover member, and on both left and right sides, when the damper device Q is in the open state,
Outlet u! An air outlet @(2) is provided for blowing out the cold air from 19 to the refrigerating compartment opening.

Fig. 1 shows the control electric circuit of the present invention, □□□ is an AC power supply, and this AC power supply is equipped with a full-wave rectifier (C), the motor (12M) and the compressor that constitute the cooling operation circuit, respectively. connected in parallel. The button is a micro combinator, which includes a freezing room temperature control section C31) equipped with an A/D conversion section, a temperature setting section, a comparison section, etc., and a refrigerating room temperature control section C31) equipped with an A/D conversion section, a temperature setting section, a comparison section, etc. It consists of a control section (0) and a timer section (c) which outputs a pulse for a period of time, for example, 10 seconds, when the compressor (2) is driven.

The input end of this timer unit is connected to the output end of the freezing room temperature control unit Gυ. C341 is a first relay that controls energization of the compressor and motor (12M), and a coil (C) connected to the output end of the refrigeration room temperature control unit Gυ.
and a contact (to) which closes as the coil is excited to drive the compressor (2) and the motor (12M). This contact point (to) serves as a cooling operation switch. (OR) is an OR circuit, the input terminal of which is connected to the refrigeration room temperature control section (three output terminals), and the output terminal of the timer section (c) is connected to the other input terminal.Gη is a switching transistor that forms a series circuit with the coil 09 of the second relay (to), and its base is connected to the OR circuit (
OR) is connected to the output terminal of the OR). The contact point of the second relay (40 is a switch for controlling the damper device αη, and forms a series circuit together with the current limiting resistor 0υ and the drive source C24 of the damper device a7). (FS) is a sensor that detects the temperature of the freezer compartment [F], and the measured temperature (TM) is taken in as an input to the refrigeration room temperature control rule of the microcombinator (to),
The D-converted temperature is compared with the preset upper and lower limit temperatures (TH) (TL) of the freezer compartment entrance. (R3) is a sensor that detects the temperature of the refrigerator compartment, and the measured temperature (Tm) is taken as input into the microcomputer-based refrigerator room temperature control section C3D, A/D converted, and set in advance. Upper and lower set temperature (Th
) (Tl). (DS) is a sensor such as a reed switch that detects either the fully open or fully closed position of the damper device αD.1, for example, detects the opening operation time of the drive source from the fully closed position to the fully open position. By giving the opening operation time from the refrigeration room temperature control unit 03 to the drive source (2) as the closing operation time required from the fully open position to the fully closed position, the appropriate fully closed and fully open positions are secured.

Next, the control of the refrigerator (1) will be explained with reference to FIGS. 1 to 6.

The cooling operation is repeated, and as shown in Fig. 6, the measured temperature (TM) at the entrance of the freezer compartment detected by the sensor (FS) becomes the upper limit set temperature (T
H), the output from the refrigeration room temperature control unit Gυ is connected to the coil (to) of the first relay (b) and the timer unit (c).
given to. As the coil (to) is energized, the contact (
) is closed [so-called on state, and the motor (12M) and compression ring that constitute the cooling operation circuit are energized and the cooling operation is resumed, while at the same time, the OR circuit (OR) is By outputting a pulse, the output terminal of the OR circuit (OR) becomes a high level, and the switching transistor C37) becomes conductive, and with this conduction, the coil (3!J) of the second relay (to) becomes conductive. When excited, the damper device @ (contact 0I, which is a switch for controlling Iη)
is closed, and this forced signal causes the drive source c! of the damper device αη to be activated. When the shaft is energized, the length damper device αη is forcibly opened for 10 seconds, and during this period, the cooling chamber (
The cold air of 8) is supplied from the air outlet @(capital) through the outlet α4.

That is, the damper device αD is brought into an open state in synchronization with each drive of the compressed root circumference, and this open state is maintained for 10 seconds. Incidentally, the open state of the damper device αη is detected by a sensor (DS), and with the detection of this open state, the output from the refrigeration room temperature control section c32 to the OR circuit (OR) is cut off, and therefore the switching transistor (9) is non-conducting, the coil +39 of the second relay (to) is de-energized, the contact is open, the damper device side is fixed in the open state for klo seconds, and after 10 seconds, the output from the refrigeration room temperature control unit turns on or off. The output end of the circuit (OR) becomes high level, the switching transistor C37) becomes conductive, the coil 09 of the second relay (to) is energized, and the contact (41) becomes closed, causing the drive source 24.
The closing operation of the damper device C171 is applied to the damper device C171. When the cooling operation progresses and the measured temperature (TM) of the sensor (FS) reaches the lower limit set temperature (TL), the output from the freezing room temperature control unit Gυ to the first relay C14) is cut off, and the coil can is de-energized. As a result, the contact (7) opens and enters a so-called OFF state, and the motor (12M) and compressor (2) are de-energized and the cooling operation is stopped. In other words, temperature control at the entrance of the freezer compartment is performed by turning on the contact tap,
This is done based on repeated off-states, and the temperature at the entrance of the freezer compartment is maintained within the range of the upper and lower set temperatures (TH) (TL).

On the other hand, when the measured temperature (Tm) of the refrigerator compartment fR1 detected by the sensor (R8) reaches the upper limit setting value (Th) stored in the refrigerator room temperature control section C33, The OR circuit (OR) K pulse is given, whereby the output terminal of the OR circuit (OR) becomes a high level and the switching transistor c37) becomes conductive, and along with this conduction, the coil O1 of the second relay (c) is excited. The contact (40) closes and enters the so-called on state. The closing operation of this contact (41), that is, the period (fi), the driving source Q (a) of the damper device αD is energized and the buckle plate α is opened. condition, and the cooling room (8
) is supplied to the refrigerator compartment fR1 from the outlet through the outlet QCjI. The open state of this damper device (In) is detected by the sensor (DS), and the damper device αη is fixed in the open state as described above.
When the cold air supply to R1 progresses and the measured temperature (Tm) of the sensor (R8) reaches the lower limit set temperature (T), the output terminal of the OR circuit (OR) is becomes high level and the switching transistor 137
) becomes conductive, and with this conduction, the coiler of txcJE 21J is energized, the contact (40 is closed, and the drive source 1
2 (a) is energized to give the damper device fi (17) a closing action. As the damper device αη(7) closes, the discharge port 09 is closed, and the supply of cold air to the refrigerator compartment (R) is stopped. In other words, the temperature control in the cold room (ship) is performed based on the repetition of opening and closing operations, so-called on and off operations, of the damper device αη. ) is maintained within the range.

Incidentally, FIG. 7 shows a flowchart of the damper device a during operation of the refrigerator (1).

Therefore, according to the control force method of the present invention, when the compressor (2) is driven, the damper device (1η) is forced to open, and the cooling room (8
) through the discharge port Q5) to the refrigerator compartment (R1) for a short period of time, the high-humidity cold air that had accumulated in the vicinity of the damper device @ and αη can be removed, and as a result, Frosting or freezing on the damper device α force and malfunction of the damper device (In) caused by this frosting or freezing can be avoided.

(g) Effects of the Invention According to the present invention described above, the damper device is forcibly opened intermittently in synchronization with the drive of the compressor for short periods of time regardless of the temperature of the refrigerating room to remove the high temperature accumulated near the damper device. Since humid cold air can be removed by low-temperature, humid cold air supplied from the cooling room to the refrigerator compartment, frosting or freezing on the damper device and malfunction of the damper device caused by this frosting or freezing can be avoided. The operating characteristics of the damper device can always be maintained in good condition.

[Brief explanation of the drawing]

The drawings are all related to the method of controlling the refrigerator of the present invention.
Figure 1 is a control electrical circuit diagram, Figure 2 is a vertical cross-sectional view of the refrigerator,
Figure 3 is a perspective view of the refrigerator compartment, Figure 4 is a sectional view taken along the line A-A in Figure 2, Figure 5 is a refrigerant circuit diagram, Figure 6 is a time chart showing control characteristics, and Figure 7 is a diagram of the damper device. 5 is a flowchart showing control. Mouth: Freezer room, (Publisher: Refrigerator room, α2: Blower, C171: Damper device, 4: Compressor. Figure 3 A8 Figure 4 Figure 5

Claims (1)

[Claims] 1. Equipped with a freezer compartment and a refrigerator compartment, operates a compressor and a blower based on the temperature of the freezer compartment, and adjusts the amount of cold air flowing into the refrigerator compartment by operating a damper device based on the temperature of the refrigerator compartment. and maintains the refrigerator compartment within a set temperature range, and forcibly opens the damper device when the compressor is driven, regardless of the temperature of the refrigerator compartment.