JPS62101985A - Control device for circulation of cooling air - Google Patents

Abstract

PURPOSE:To enable an error, generated in accordance with rotation of a motor, to be absorbed, by providing a section, which places a cooling air control plate in an unchanged condition, in a predetermined range containing a rotary angle setting a cam. CONSTITUTION:A damper unit is driven by a motor. An introducing amount of cooling air, when the damper unit is opened, is changed by a working time of the motor. A distance from a shaft 63 to a side surface provides no change in sections P2, P4 or P3 of a cam 66. An unchanged section for a baffle plate opening is provided in the section of 15 deg. respectively before and after the target rotary angle of the cam 66 serving as the center. Accordingly, even if an error is slightly generated in the rotary angle by inertia or the like of the motor 61, a stable temperature control is performed with no generation of an error in the opening of a baffle plate in the unchanged section.

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention is directed to a system that is provided in a cold air distribution path and that controls the distribution of cold air by t.
This invention relates to a cold air distribution control device that controls lJ.

(B) Prior Art Conventionally, for example, in a refrigerator, the interior of the refrigerator is cooled by supplying cold air directly into the storage compartment or by supplying cold air to a cold air passage that indirectly cools the storage compartment. What is temperature control when cooling the inside of a storage room by forcibly circulating cold air in this way?

Conventionally, this has been done by opening and closing cold air discharge ports in a cold air distribution path using a damper thermostat as a cold air distribution control device as disclosed in, for example, Japanese Utility Model Application Publication No. 60-54078.

The damper thermostat as shown in the above-mentioned publication detects the temperature inside the storage chamber with a heat-sensitive capillary tube filled with gas, and uses compression of the gas and Pg tension due to temperature changes in the chamber to EEW and EEW the bellows. The temperature of the storage room is controlled by controlling the amount of cold air supplied into the room by extending it, thereby driving it as a damper, and opening and closing the cold air outlet by backflushing.
Since this method utilizes the phase change of gas through a capillary tube, the response to a change in m degrees is slow.

Furthermore, since the accuracy is low, it is difficult to change the temperature setting, and the controlled temperature is not stable.

In order to eliminate such drawbacks, it is conceivable to electrically control the opening and closing of the temporary switch to improve response speed and reliability. The first step in this case is:

It is conceivable that the damper is driven by using the attraction and detachment of the plunger by a solenoid coil.
Only two states can be selected: open or close the discharge port, and 1
There is also the problem of impact noise during operation.

Next, it is possible to rotate a cam by a motor and drive a damper by this cam. According to this, it is possible to eliminate impact noise by adopting a speed reduction mechanism, and by appropriately selecting the operating time of the motor. The rotation angle of the cam can be set and the position of the damper can be selected in various ways, thereby providing various advantages such as being able to adjust the cold air tt from the cold air discharge port.

[B] Problems to be Solved by the Invention A cold air distribution control device using a motor can achieve effects such as those shown above. There is a risk that an error will occur in the opening degree of the damper due to factors such as the inertia of the damper itself.This will occur no matter how well timed the motor is controlled. Conversely, if the deceleration is increased, the operating speed of the device becomes too slow, and there is a problem in that the value of electrical control is lost.

In order to solve this problem, the present invention rotates a cam by a motor, operates a cold air control section, and controls the motor's ti! In a cold air distribution control device that changes the state of the cold air control plate by controlling the transmission opening time and setting the rotation angle of the cam, the cam has a function that changes the state of the cold air control plate within a predetermined range that includes the set rotation angle. It forms an area that will remain unchanged.

(E) Function According to the present invention, since the cold air control plate is driven by the motor, the responsiveness is excellent. In addition, by appropriately selecting the operating time of the motor, the temporary state of the cold air control system can be changed in various ways.Furthermore, even if an error occurs due to the rotation of the motor, the error can be absorbed in the unchanged area. Embodiment An embodiment in which the present invention is applied to a refrigerator will be described with reference to the drawings. FIG. 4 shows a side sectional view of the refrigerator (1). The refrigerator (1) has an inner box (3) made of synthetic resin built into the outer box (2) made of steel plate with a gap between the two.
The inside of the cold storage compartment (1) is divided into upper and lower parts by a heat-insulating partition wall (5), and the insulation box is constructed by foam-filling urethane insulation material (4) between 31 and 31. A freezing chamber [F] which is cooled by a freezing degree (for example, -20° C.) Ic, and a storage chamber tS whose temperature can be selected as described below are formed below. (6) is the back plate of the freezer compartment [F],
Freezer compartment [F] of inner box (3) with insulation material (7) on 8 sides
There is a gap between the back surface of the part and the heat insulating material (7), which forms a cold air passage (8) above and below, and is attached to the inner box (3). A refrigeration cycle cooler (9) is installed in this cold air path (8).
) is installed vertically, and above it an air blower fil is attached to the heat insulating box. FIG. 5 shows a plan cross-sectional view of the CtO+ portion of the blower. Slightly below the part of the back plate (6) that is installed in front of the blower αω, there is a discharge port (12 Ut) that communicates with the cold air passage (8) above the cooler (9), and at the lower end of the back plate (6). is the cooler (
9) Inlet port 1131 communicating with the lower cold air passage (8)
b: A hole is provided, and after the cold air discharged from the blower Fll collides with the back plate (6), a part of it flows through the discharge port Q.
It is discharged into the freezer compartment IF) from 2, cools the inside of the various chambers (G), and then is sucked into the cooling 4 (9) through the suction port +13.

Air blower (inner box (3) located on the side of 1α) There is an opening I on the back wall.
is formed, and on the back of this opening (inner box (3) of section 14,
Storage room (S) back wall soil section discharge port (19 and cooling 4 (9) E
A duct member (17) is attached that forms an opening (duct communicating through 141) t161 with the other cold air passage (8). or.

Inside the partition wall (5) are the front upper part of the storage room (S) and the cooler (9).
) A return passage Q9 is formed which communicates with the lower cold air passage (8). At the corner of the back wall of the inner box (3) on the side opposite to the blower UO+ of the opening 14), a damper device (a) as a cold air distribution control device of the present application is buried in the heat insulating material (4). A baffle plate υ as a cold air control plate included in this damper device (a) is located in front of the opening 1141 to open and close it. Bakful board 12D has an inner box (3
) The corner side is rotatably supported, and the damper device -
As the moving rod σJ moves forward, it rotates counterclockwise in Fig. 5, opens the opening I, and turns on the blower (
When the cold air discharged from 1α collides with the back plate (6) and flows in the direction of the duct (duct) 116), there is an auxiliary plate that stands up perpendicularly to the direction of the opening I on the backful plate Qυ. (
21A) is formed, which allows the cold air to flow through the opening α
4. On the other hand, as the movable rod (73) retreats, the bakful temporary circle rotates clockwise in Fig. 5 and closes the opening. After flowing into the storage room (S) and being cooled by circulating there, it flows into the cooler (9) from the return passage marked α.
). In this way, the cold air supply to the storage room tS) is controlled at the opening I portion of the duct 161, so for example, in the case where the discharge port u9 is opened and closed, when the discharge port (lS) is closed, the duct (Due to the difference in temperature between 161 and the storage room (S), ice may form on the baffle plate υ, and unnecessary cold air will be stored in the duct (161) and wasted, but in this application, such inconveniences are resolved. When the opening u4) is closed, the cold air that should go from the blower (10) to the duct H61 is discharged forward from the outlet (12A) in the corner and is effectively used for cooling the freezer compartment. , there is no wastage of cold air. (C) is a door that can open and close the freezer compartment [F] and storage compartment (S), respectively. (B) is a refrigeration cycle (including a compressor) .

FIG. 8 shows an electric circuit diagram for controlling the temperature of the house freezer [F]. (4G is a negative characteristic thermistor that detects the temperature in the freezer compartment [F], and is connected between the DC power supply ('V=J and the grounded resistor (49), and the terminal potential of the resistor (41J) is (-) is input to the input terminal, and the comparator (42
The (+) input terminal of is inputted manually to establish the setting determined by the resistors (43 and (44). , is connected to the gate of the triac (48) for triggering the gate of the triac (4η).The triac (47) has tIL! in series with the AC power supply.
The IEb compressor (c) driving motor (26M) and the blower's motor (IOM) are connected in parallel circuit b. When the temperature of the comparator (42 is the freezer compartment r) reaches, for example, -18°C or higher, the output becomes low level (hereinafter referred to as rLJ), triggers the triacs (48) and (47), and causes the motor (
26M) (IOM), for example, when the temperature rises above -22℃, the output becomes high (hereinafter referred to as rHJ), the triac (481 (4?) becomes non-conductive, and the motor (2
6M) (IOM) is stopped. The freezing compartment IF) is thereby cooled to a mean temperature of -20°C.

Next, Fig. 1 shows an enlarged plan sectional view of the damper device (A) part, and Fig. 2 shows a partially cutaway front view of the end of the damper device.
- is a case that is buried in the insulation material (4) from the opening [4] (opening formed in the inner box (3) on the ILJ side), and the drive shaft (61a) is protruded forward in this case group. a small-diameter bevel gear fEi3 attached to the tip of this drive shaft (61a), and a large-diameter bevel gear fixed to the rotating shaft extending downward from the top inside the case and meshing with the bevel gear 6. is stored. This bevel gear β2 and (goods) constitute a reduction mechanism (to),
Converts the rotation of the motor to the rotation of the rotating shaft. A cam is further fixed to the rotating shaft.

The cam is a disc-shaped plate having a predetermined thickness, and a plan view thereof is shown in FIG. (L,) (L,) (L,) and (L,)
are the lines indicating the axis of rotation (n'', 90°, 180°, and 270°, respectively, centered on saliva. The area (P, ) of 30° centered on the axis ((Ll) is centered on the axis ((to) The center of a circle with radius 4r is offset by r on (Ll), and the side surface shape is an arc in the opposite direction of the deviation, that is, an arc approaching the axle load.Therefore, from the center of area (Pl) shaft(
The distance to (to) is 3r.

Also, 30 each centering on (L2) and (L4)
Areas (P2) and (P4) of ゜ are circular arc side shapes with radius 4r centered on axis C3.Furthermore, area (P3) of 30'' centered on axis C3 has a radius centered on the axle load. It has a side surface shape of an arc of 5r.Furthermore.

The respective areas are connected by smooth curves, keeping a distance of at least 3r from the axis.

The baffle plate 3υ is rotatably fixed to the front wall of the case (six non-opening α4 measurement ends) under the axial load. connected with
Always open [4)? : Forced in the closing direction.

The movable rod (7■?・i front wall) has a front wall that can freely move in the front and back direction, and is slidably in contact with the cam (to) and panfur temporary Cυ. Also, the 21) is a switch that closes the contact point (74A) when the opening I is closed. Furthermore, this switch σ may be caused to detect the closing of the backful plate Qυ as a contact relationship with the cam ((to)).

FIG. 7 shows a temperature control circuit diagram of the storage room (S). σ is a negative characteristic thermistor that detects the temperature inside the storage chamber (S), and the thermistor C:I5 is divided by the resistance σe.
) is input to the (-) input terminal of the comparator (2). The (+) input terminal I/c of the comparator ση receives a setting It determined by the resistors σ and σ. ill source (
The resistor σSK connected to the switch (S
A series circuit of a resistor (W,) and a relatively large value resistor is connected, and a series circuit of an analog switch [F]υ and a relatively small value resistor (8) is connected in parallel to the resistor layer. Ru.

The comparator ση is connected to a positive feedback resistor Zeng and has hysteresis.

Its output is input to an AND gate.

Between the power supply (vcc) and the ground, there is a series circuit of a switch (SWt) and a resistor, a terminal voltage of the switch (SW, ) and a resistor, an AND gate, and an analog switch [F
] To the gate of υ, and the terminal α position of the resistor (87) is AND
Each gate is manually operated. Switch (SWt
) and (sWs When one door is closed, the other one is opened, and when the switch (SW, ) is closed, the switch (5W1) is also opened. These switches (SWl) (SWri (SW3) are It is placed above the operation panel provided on the front of the door (c).

The output of the AND gate is converted into a pulse by the differentiating circuit (I1) and input to the input terminal of the timer (TO).From the time when the rHJ pulse is input to the input terminal of the timer (T+), ) The time output terminal is rHJ, and its output is input to the OR gate (911I.A
Similarly, the output of the ND gate (G) is inputted to the input terminal of the timer (I2) via the differentiating circuit (I2),
I2) is input after rHJ pulse b'- enters the input terminal (I
2) Let rHJ be the time output terminal.

The output is input to OR gate (2). The output of the OR gate passes through a differentiating circuit (9) and a flip-flop (9υ).
The signal is inputted to the reset terminal, and further inputted to the reset terminal of the inverter (9'!J and the differential circuit (2) and the clip-flop O1). The output of the OR gate (G) further passes through an inverter (9) and a differentiating circuit (IS) to a timer (
The rHJ pulse is input to the reset terminal of T, ) (T,), and each timer (T, ) (I2) is reset by inputting the rHJ pulse to the reset terminal. The output of the comparator ση is further connected to the set terminal of the clip-flop (9υ).
and manually through the differential circuit (I,), and again.

The reset terminal also has a contact point (74A) for the switch σ
and the terminal I of the resistor (G) connected in series with the power supply (VCC).
t is inputted via the differentiating circuit (I7). The inverting output terminal of the flip 70 (91) is connected to the gate of the tribe circuit connected in series to the motor and the alternating current power source (AC).

The temperature control operation of the storage compartment (S) in the configuration above μ will be explained with reference to FIG. 9. First, when the storage compartment t8) is used as a freezing compartment, the switch (SWZ) is closed. At this time, the switch (SWυ(SW,) is open. As a result, the analog switch g31J becomes conductive, and the resistor (1B is connected in parallel with a small resistor So, so the comparator ση's (+
) The input ridge rises relatively significantly, and at this time the ratio of 177
1 output &±IP *, ff1lh of subtraction q); -I
R'('', Fr1J l, and becomes ``L'' at -22℃. When the storage chamber (S) is sufficiently cool, 1・Macam (66) is indicated by the dashed line in Figure 1. Show (66a
) is in contact with the moving rod σ3VC at the shortest distance 'a3'' from the rotation axis, and the backful plate Qυ is at the position (21a), closing the opening I. From the stiff state, the storage chamber (S ) rises, and on the zero time side in Figure 9, -11
When the temperature reaches 8°C, the output of the comparison δση becomes "H", and since the terminal of the resistor - is also rHJ, the output of the AND gate 0 becomes "H", and the rHJ pulse is manually input to the timer (T,). The output of the timer (T,) becomes rHJ.

As a result, the output of the OR gate V9I becomes rHJ, and the "l(" pulse enters the four terminals of the clip-flop (9υ), which is set, and the inverted output terminal "-rLj
It became a triac! η4 through, motor 6υ/ll
'Turn around once. As a result, the cam field rotates ti clockwise in Fig. 1, and when the output of the timer (T,) reaches rLJ at time (t,) after (tl) time has elapsed from the start of rotation, the OR gate QO) The output becomes rLJ, and the output of the inverter (92) becomes 6ZrHJ, so the rHJ pulse is input to the reset terminal of the flip-flop (9υ) and is reset, and the 1 inverted output terminal becomes ``H'' and the triac punishment becomes non-conducting. Then, the motor 6B stops.At this time, the rotation angle of the cam iron is 1800°, and at this time, the cam (T) is in contact with the moving rod (73) in an upright position at a maximum distance of 5r from the rotary shaft (distance). As a result, the movable rod (73) is pushed furthest forward, and the bakful (2υ) is fully opened at the farthest distance from the opening α, and stops upright against the back plate (6) as shown by the solid line in FIG.

In this state, a large amount of cold air is introduced into the duct 1.161, and the storage room (S) is rapidly cooled down.Then, when the temperature of the storage room (tS) decreases to -22°C, the output of the comparator ση ? Since it is inverted to JZrLJ, the output of the inverter becomes rHJ, and the set terminal of the flip-flop aυ is
H” pulse is input and set, and the 1 inverted output terminal is r
It becomes LJ, the triac conducts, and the motor υ is operated. As a result, the cam (66) further rotates counterclockwise, thereby closing the baffle temporary υ, and when the opening I is completely closed, the contact (74A) closes and rtEE is generated in the resistance (g). Flip-flop (9
The motor [F] υ stops at σ] which resets υ.

Hereafter, this is refrozen, Dak) A large amount of cold air b in t161
Since the inside of the storage room (S) is kept at an extremely low temperature of -20°C on average between -18°C and -22°C, frozen foods can be stored.

Next, when the storage room tS> is used as an ice room.

Close the switch (SW, ) and then press the switch < SW,
＞ is closed, the switch (SW2) is opened, and at this time, a resistor (to) is connected in parallel to the resistor (7 barrels), and the comparator σD
(+) inputllll! As a result, the temperature of the storage room (S) increases by a small amount, for example, 0°C.
Let the output be rHJ.

The output becomes rLJ at -3°C. Storage room (Sl
is sufficiently cold and the temperature rises with the buckle plate υ (21a) standing upright and the opening I closed and reaches O"C at time zero in Figure 9, the output of the comparator c77) becomes rHJ. At this time, a high potential is generated at the terminal of the resistor η, so the output of the A N D gate becomes rHJ,
``H61 pulse b'- is inputted to the timer (T2), the output becomes rHJ, the output of the OR gate is Q(J tonally flip-flop ωυ is set, and the motor (6B is saved by 1) as described above. As a result, the cam field rotates counterclockwise in Figure 1, and from the start of one rotation, this time (t2
) When the output of the timer (T2) becomes rLJ at time (t, ), the output of the OR gate (9C becomes rLJ, and the output of the inverter (9) becomes rHJ, so the flip-flop 0υ is reset and the above-mentioned Similar motor→υ
stops. At this time, the rotation angle of the cam] (to) is 270a
At this time, the cam is attached to the rotating shaft 63 as shown in FIG.
The part with the longest distance 5r is located directly below, and is located at (66b) shown by the dashed line in Fig. 1, and the movable rod σ9 is placed vertically at a distance of 4r between the longest and shortest points from the rotation axis t (to). are in contact. As a result, the Bacful Temporary CD stops in the intermediate state indicated by (21b) in Fig. 1, which is approximately halfway between the fully open upright position and the closed position.In this state, cold air is introduced into the duct (16) and the storage room is closed. (S) is cooled and the temperature decreases to -3
When the temperature reaches ℃, the output of the comparator ση is inverted to rLJ, so the output of the inverter (9) becomes rHJ, the flip-flops 1 and 9υ are set, and the motor rotates.

This causes the cam (66) to further rotate counterclockwise.

Stop in the same manner as described above with the openings of the bakful temporary cylinders closed.

Hereafter, the temperature inside the storage room (S) is repeatedly set to -2°C between 0°C and -3'C. Here, 0°C to -3°C is the freezing temperature storage temperature range. Freezing storage temperature and 1.1 The freezing point of food is based exclusively on the property of being lower than the freezing point.

This refers to the temperature at which food is just about to freeze, even if it is below freezing. By storing food in this temperature range, it is possible to prevent the growth of bacteria and preserve it for a relatively long period of time without freezing the food. Furthermore, deterioration of flavor due to freezing is also prevented. The range of this ice-temperature storage temperature range is relatively narrow.
Since the inflow of cold air from the opening I is restricted and reduced, the damper device W4f:7Il″l
1: is suppressed, and the error amount of cold air t flowing in during the baffle temporary movement is reduced, and the temperature is well controlled within the temperature range. Also, at this time, the opening operation of the temporary baffle υ changes from closed to intermediate, then fully open, then closed again, and then to intermediate, as shown in Figure 9, so a relatively large amount of cold air is introduced at the start of cooling. This contributes to improving the cooling speed, and since the backful plate Qυ is rotated 90'' from the open position to close, supercooling caused by cold air flowing in while the baffle plate Qυ is moving is also extremely reduced.

Next, when using the storage room (S) as a refrigerator room 1. j.

When the switch (SW, ) is closed, switch < Sw,
) is open (at this time, the switch (SWt) is open)) At this time, the set potential connected to the (+) input terminal of the comparator ση is a relatively low value divided by the resistor (18 and σ). Therefore, the output of the comparator ση is rHJ when the temperature of the storage room (S) is +5℃, and the output is rLJ when the temperature of the storage room (S) is +1℃. ) is driven by a motor 69.

+3 on average by controlling the baffle plate υ to close and open
℃. The effect is almost the same as described above.

As described above, the storage room (S) can be selectively used as a freezing room, an ice room, or a refrigerator room, so it can effectively respond to changes in the composition ratio of frozen food, frozen food stored at ice temperature, or refrigerated food among the foods to be stored. , the dead space of the refrigerator volume is reduced, and indoor space is effectively utilized. Also, in this case, the damper device (a) introduces cold air when opening the sheet.・It can be changed depending on the operating time of the controller 6B. For example, even if the opening area of the opening I is increased considering the temperature side characteristics when used as a freezing room, when controlling in other @ temperature ranges, , the control performance in each temperature range is not impaired because the degree of sensitivity is limited by using the Pazful temporary shift υ as a starting point. Furthermore, since the damper device (A) is driven by a motor 161J with a speed reduction mechanism 9, it has good responsiveness to temperature changes, making it possible to maintain a stable temperature f, and the backful plate 3υ opens when closed. α
Since it does not collide with the interrogation record, it does not generate noise compared to a magnetic damper.

Moreover, as mentioned above, within the cam (area (P2) CP, ) or (P,) of 661, the distance from the axle load to the side surface (there is no change; that is, the target rotation angle of the cam group, for example, 180
”(Full-open Cυ fully open) or 270° (Area of 15 degrees front and back centering on the full plate (2υ middle open) is an area where the opening of the full plate υ does not change. Therefore, the inertia of the motor, Even if there is some error in the rotation angle due to the meshing error of the gear (63-), there will be no error in the opening degree of the baffle plate in the unchanged area, and stable temperature control and X are possible. Furthermore, the deceleration of the deceleration mechanism can be reduced, and the operating speed of the puffful temporary ■υ can be increased.

In the embodiment, the present application is applied to a damper device that controls the temperature of a storage compartment of a refrigerator, but the present application is not limited to this, and may equally well be applied to a cold air distribution device that controls the direction of flow of cold air. Various applications are possible without departing from the scope.

(G) Effects of the Invention According to the present invention, since the cold air control plate is driven by a motor, responsiveness is improved. Further, by appropriately selecting the operating time of the motor, the shape of the cold air control plate can be changed in various ways, increasing the applicability and increasing the degree of freedom in control. Furthermore, since inertia of the motor and rotation errors in the transmission mechanism are absorbed in the unchanged area of the cam, reliability of operation can be improved.

[Brief explanation of drawings]

Each figure shows an embodiment of the present invention, and FIG. 1 is a plan sectional view of the damper device, and FIG. 2 is a partially cutaway front view of the same. Figure 3 is a plan view of the cam, Figure 4 is a side sectional view of the refrigerator, Figure 5 is a 111iff side view of the NL machine, Figure 6 is a @1lffr side view of the duct, and Figure 7 is a side view of the refrigerator. 8 is a temperature control circuit diagram for the storage compartment, FIG. 8 is a ridge circuit diagram for temperature control of the freezing compartment, and FIG. 9 is a diagram for explaining the operation of the damper device. α seepage...opening, ue...duct, +21m...
・Damper device, Qυ...backful plate, 1131)・
...Motor, iron...cam, (pt) (P3) (
P4)...unchanged area, (To(Tri...timer) Applicant: Sanyo Gki Co., Ltd. Patent attorney: Yasuo Sano Figure 2 Figure 2% S3 Figure 4 Figure 6 Figure 8 Figure 9

Claims (1)

[Claims] 1. A cold air control plate provided in a cold air circulation path, a motor that rotates a cam and drives the cold air control plate by the cam, and a rotation angle of the cam is set by controlling the operating time of the motor. and a control device for changing the state of the cold air control plate, and the cam has an area in a predetermined range including the set rotation angle in which the state of the cold air control plate is not changed. A cold air distribution control device featuring: