JPH03191284A - Temperature control device of refrigerator - Google Patents

Abstract

PURPOSE:To simplify a driving circuit by performing the opening and closing of cold air inflow by driving a DC motor by switching on/off first and second FETs to rotate a rotor having blades provided in a housing. CONSTITUTION:A title device includes outlets 12 communicating with a cold air inlet 11 provided on the same flat plane in a square housing 10, two openings 13 having angular difference of about 120 deg. between the inlet 11 and the outlet 12, and a hollow cylindrical protruded portion 14 formed in the center of the housing 10. A DC motor 15 is driven by first and second FETs 34, 35. Since the openings 13 are opened and closed by three blade parts 19 mounted at an angle of about 120 deg. on the substantially cylindrical protruded portion 14 mounted and adapted to be rotatable by the DC motor 15, there is no need of providing on a duct panel 32 a displacement margin space in the blow-off direction of cold air, and hence a refrigerator effective utilization volume can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a temperature control device for a refrigerator, for example, which controls the internal temperature of a refrigerator by opening and closing a cold air intake.

2. Description of the Related Art In a refrigerator equipped with a freezer compartment and a refrigerator compartment, cold air produced by an evaporator is sent into the refrigerator compartment through a duct. The duct inlet part is equipped with a refrigerator temperature control device (hereinafter referred to as a damper thermostat) disclosed in, for example, Japanese Utility Model Application No. 61-23673.
is installed, and if the temperature inside the refrigerator rises, the damper thermostat opens to allow cold air to flow in, and if the damper thermostat falls, the damper thermostat closes to stop the inflow of cold air.

A conventional refrigerator temperature control device will be described with reference to FIGS. 7 and 8.

(not shown) into the duct 1.

Reference numeral 2 denotes an opening for discharging cold air from the cold air duct 1, and a damper thermostat 3 is attached to the opening. The cold air coming out of the damper thermostat 3 is discharged into the refrigerator through an air passage 6 formed in a duct panel ρ4 forming a passage for the cold air. Further, the damper thermo 3 opens and closes a flame roller provided in the opening 2, an opening 7 in the frame, and a flap 8 rotatably provided in the opening 7. The flap 8 is urged in the flap closing direction by a spring 9, and the shift flag 8 is opened and closed by the AC motor 1o.

Problems to be Solved by the Invention However, in the above configuration, the flap 8 of the damper servo 3 rotates in the cold air blowing direction to open and close the opening 7, so the movement allowance of the flag 8 in the cold air blowing direction is Therefore, the thickness of the duct panel 4 that forms the cold air flow path becomes large, protruding into the refrigerator, and the effective usable volume inside the refrigerator decreases. Also, AC
Since the flap 8 is opened and closed by the motor 10, a relay or the like is required to drive the AC motor 1°, which also has the disadvantage of requiring a large space on the control board.

The present invention aims to provide a temperature control device for a refrigerator in which the thickness of the duct spring/V4 can be made thin so that the effective usable volume inside the refrigerator can be increased, and the temperature can be controlled by a simple drive circuit.

Means for Solving the Problems In order to solve the above problems, the present invention has an outlet section installed at the inlet of a cold air inflow duct and communicating with the cold air inlet section, and an opening between the inlet section and the outlet section. a rotor rotatably provided in the housing and having a blade portion that opens and closes the opening; a first FET with a drain side connected to a positive voltage; and a first FET with a drain side connected to a positive voltage.
A second FET is connected to the source side of the ET, and the source side is connected to a negative voltage; It is composed of a DC motor that drives the grounded rotor.

Function The opening and closing of cold air inflow is performed by the first FET and the second FET (7
) The DC motor is driven by the ONloFF, and the rotation operation of the rotor with blades provided in the housing is performed.

Example An embodiment of the present invention will be described with reference to FIGS. 1 to e.

1o is a square housing, with a cold air inlet 11 on the - side.
It communicates with the inlet 11, has two outlets 12 on the same plane, and on side surfaces perpendicular to the inlet 11. There is approximately 120 mm between the inlet 11 and the outlet 12.
Openings 13 are formed forming an outer frame at an angle of .degree., and there are two openings 13 corresponding to the exits 12. A cylindrical protrusion 14 is provided at the center of the housing 10, and the protrusion 14 is hollow. Furthermore, a flat DC motor 16 as a drive source, its output gear 16', and a disc 17 to which the DC motor 15 is attached and which holds the reduction gear 16 are housed in the hollow part of the protrusion 14. , the final stage 16' of the reduction gear 16 is connected to the circular hole 14' of the protrusion 14.
protrude from Further, the rotor 18 rotatably attached to the outer periphery of the protruding portion 14 has a hollow cylindrical portion 18'.
Three angular blades 1 that are offset by approximately 1200 angles.
9, and a gear 18 is provided inside the hollow cylindrical portion 18'.
" is formed, and the final stage 16' of the reduction gear 16 is formed.
They are interlocked.

Two of the vanes 19 are attached with a high-density foam sealing material 2o for sealing 19', and are adapted to come into contact with and separate from the opening 13 of the housing 1o by rotation.

The remaining one 1f of the blade portions 19 is attached to the rotor 18 using two protrusions 21 provided on the housing 10 as stoppers.
It regulates the movement of The rotor 18 has a hole 23 in the center thereof through which a holding shaft 22 passes, and is held by this hole.

Furthermore, a cover 24 covering the housing 1o is attached to the housing 1o with screws 26. Note that a sealing form (not shown) is attached between the cover 24 and the housing 1o.

34 is the first FET, whose drain side is connected to the positive voltage V+,
The gate G side is connected to input a control signal v1 of a control device (not shown). 36 is a second FET, whose source side S is connected to a negative voltage V-, and whose gate side G is connected to input a control signal v2 from a control device (not shown). D.C.
The motor 15 has one end A connected to the source side S of the 10th FET 34 and the drain side of the 20th FET 35, and
The other end B of the C motor 15 is connected to the ground.

Here, the operation of one embodiment of the present invention will be described.

When the temperature sensor (not shown) inside the refrigerator reaches a predetermined temperature T1, the first
The control signal v1 of 0FET34 is input, and the first FE
T34 becomes ON state (at this time, the second FE735 becomes O
(FF state), current flows through the DC motor 15 from one end A to the other end B. Furthermore, when the temperature reaches a predetermined temperature T2, the control signal v2 of the second FET 35 is input to the gate side G of the second FET 36, and the 20th FET 3575 CON is turned on (at this time, the first FET 34 is in the OFF state), and the DC motor is turned off. A current flows through the DC motor 16 from the other end B to the one end A, and the DC motor 16 rotates in both forward and reverse directions according to the control signals v1 and v2, thereby rotating the rotor 18 via the reduction gear 16.

At this point, the blade portion 19' of the rotor 18 is separated from the opening 13 of the housing 1°. Also, the remaining blade part 1
9" can freely come into contact with the two protrusions 21 provided on the housing 1o, so the blade portion 19' closes the opening 13 of the housing 10 and opens the opening 13 and the blade 1
When the position 9 reaches the position where the flow resistance is the least, it comes into contact and regulates the rotational position of the rotor 18. Drive motor 1
Since 5 is a DC motor, the rotor 18 can rotate in both forward and reverse directions.

FIG. 6 shows a state in which the damper thermometer of the present invention is attached to a refrigerator. 30 is a duct for flowing cold air;
1 is a damper thermo of the present invention. The cold air inlet 11 opens perpendicularly to the duct 30, and the outlet 12 communicates with an air passage 33 formed in the side duct spring/L'32.

As described above, the angular 71 housing 1o has the cold air inlet 11 and the outlet 12 communicating with each other on the same plane, and the two openings have an angular difference of about 120° between the inlet 11 and the outlet 12. 13, and a hollow cylindrical protrusion 14 formed in the center of the housing 1o is provided with a first FE.
3 attached at an angle of about 120° to the approximately cylindrical protrusion 140 that is rotatably attached to the DC motor 16 driven by the T34 and the second FE73g.
Since the opening 13 is opened and closed by the two blades 19, (1) The opening and closing of the opening 13 is not by displacement in the cold air blowing direction but by rotation, so the thickness of the damper thermo 31 and the flag portion There is no need to take a displacement margin in the cold air blowing direction for the duct spring A/32, the thickness of the duct panel 32 can be reduced, and the effective usable volume inside the refrigerator can be increased.

(By attaching the cold air inlet 11 perpendicularly to the duct 30, the duct 3o and the damper thermometer 31 can be integrated, the duct spring I'v32 can be formed to be extremely tingling, and when the opening 13 is open, the cold air flows from above. Utilizing the characteristic of downward flow, the position of the blades 19 of the rotor 18 is held by the stopper in a position where the cold air flows with little resistance, so the cold air does not accumulate at the bottom and flows smoothly from the inlet 11 to the outlet 12. Therefore, the predetermined characteristics can be obtained without increasing the area of the opening 13, so that the damper thermometer 31, duct spring) and v32 can be made smaller.

(3) Forward and reverse rotation of DC motor 15, opening 13
In order to open and close the Second FET34;
35, the drive circuit can be simplified, and the space on the control board can be saved.

Effects of the Invention As described above, according to the present invention, a housing is installed at the inlet of a cold air inlet duct, has an outlet communicating with the cold air inlet, and has an opening between the inlet and the outlet;
a rotor that is rotatably provided in the housing and has a blade portion that opens and closes the opening; a tenth FET whose drain side is connected to a positive voltage; and a tenth FET whose drain side is connected to the first FET.
the second with the source side connected to the negative voltage and the source side connected to the negative voltage.
(7) Since it consists of a FET and a DC motor that drives the rotor, one end of which is connected to the connection point between the first FET's null side and the second FET's drain side, and the other end of which is grounded, an open The section can be opened and closed by the rotation of the rotor without displacing the flap in the cold air blowing direction as in the conventional case, and the thickness in the cold air blowing direction can be reduced, so the duct spring μ that forms the cold air path can be made thinner. This makes it possible to improve the effective volume of the inside of the refrigerator, and the rotor is rotated by a DC motor. Second FE
This can be done with only T, the drive circuit can be simplified, and the space of the control board can be saved, which is very useful in practice.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of an embodiment of the refrigerator temperature control device of the present invention, Fig. 2 is a plan view of the device with the cover removed and the opening closed, and Fig. 3 is a plan view of the device with the cover removed. FIG. 4 is a sectional view of the device; FIG. 6 is a perspective view of the device installed in a duct; FIG. 6 is a drive circuit diagram of the device; FIG. The figure is a perspective view of a conventional temperature control device attached to a duct, and FIG. 8 is a side view of the conventional temperature control device.

Claims (1)

[Claims] a housing installed at an inlet of a cold air inflow duct, having an outlet communicating with the cold air inlet, and an opening provided between the inlet and the outlet; a rotor having a blade section that opens and closes the section;
A first FET whose drain side is connected to a positive voltage, a second FET whose drain side is connected to the source side of the first FET and whose source side is connected to a negative voltage, and one end of which is connected to the first FET.
A temperature control device for a refrigerator comprising a DC motor that is connected to a connection point between the source side of an ET and the drain side of a second FET and that drives the rotor, the other end of which is grounded.