JPH048709B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a motor actuator for a refrigerator that can control two driven members with one motor. [Prior Art] Recent refrigerators are provided with a freezer compartment and a refrigerator compartment, and the refrigerator compartment is further divided into, for example, two parts. It is designed to be sent internally independently as needed. The cold air is controlled by opening and closing plates provided in passages connecting the cooler and each refrigerator compartment. Conventionally, a gas thermo-type bellows, a solenoid, or the like has been used as a drive source for the opening/closing plate. If these drive sources were installed in each of the two divided refrigerator compartments, the mechanical structure would become larger, making it difficult to integrate in a limited space, and the failure rate would be high due to the large number of moving parts. It is predicted that this will happen.
In addition, the former type of gas thermoelectric bellows has a slow response speed and is large in size, while the latter type of solenoid, although it opens and closes quickly and completely, generates operating noise, making it unsuitable for this type of drive source. Appropriate. [Object of the Invention] Therefore, an object of the present invention is to provide a motor actuator for a refrigerator that can control driven members such as two opening/closing plates with one drive source. Another object is to utilize a motor as a drive source to eliminate the drawbacks of conventional drive means, such as slow response speed, increased device size, and operation noise. [Means for Solving the Invention] In view of the above object, the present invention enables the opening/closing states of two driven members to be controlled by the driving force of one motor, and controls the control circuit by signals from two temperature sensors. is used to start the motor while determining a predetermined operating mode, the position detecting means detects the operating mode of the two driven members from the amount of drive of the motor, and the motor is stopped in the determined operating mode. There is. [Example] Motor actuator 1 for a refrigerator of the present invention
are shown in Figures 1 to 3 as mechanical structural parts.
As shown in the figure, it includes opening/closing plates 2a and 2b as first and second driven members, and one motor 3 serving as a common driving source for these plates. The opening/closing plates 2a, 2b have shafts 4 provided at both lower ends.
a, 4b, and 3 integrally provided on the substrate 5.
It is supported by two bearing brackets 6 so as to be openable and closable, and moves to the open and close positions according to the amount of drive of the motor 3. Each opening/closing plate 2a, 2b is provided with a slightly larger gasket 8a, 8b at a position corresponding to the opening 7a, 7b formed in the substrate 5, and a plate-shaped spring fixed to the substrate 5. 9a, 9b
The openings 7a and 7b are always biased in the direction of contact with the substrate 5, that is, in the direction of closing the respective openings 7a and 7b. On the other hand, the motor 3 is fixed together with a gearbox 11 to a mounting base 10 formed on the back side of the board 5. This gearbox 11 is
An internal gear train (not shown) decelerates the rotation of the motor 3 while rotating the respective cams 12a and 12b.
In addition to transmitting the signal to the engine, it also drives the switch cam 13 built inside. As shown in FIG. 4, this switch cam 13, together with the switch 14, constitutes a position detecting means for detecting the operating mode of the opening/closing plates 2a, 2b from the amount of drive of the motor 3. High part 13H and low part 13L with central angle of 180 degrees
, and each central angle of 90 degrees corresponds to an operating mode. The cams 12a and 12b are both end-face cams, and as shown in FIG. 5, are formed with a rotation angle of trapezoidal cam curves at a rotation angle of 90 degrees. The drive pins 15a, 15b on the driven side of the cams 12a, 12b are connected to the holding holes 16a, 16 of the substrate 5.
b, and is held slidably in the axial direction with one end in contact with the cam surface of each cam 12a, 12b, and the other end in contact with the back side of the opening/closing plate 2a, 2b. The rotation of one cam 12a is transmitted in the same direction and at the same rotational speed to a gear 17, an idle gear 18, and a gear 19, which are integrated with the cam 12b. Next, FIG. 6 shows a control circuit 20 for controlling starting/stopping of the motor 3 and the amount of drive of the motor 3. As shown in FIG. The control circuit 20 includes a temperature detection circuit 21
a, 21b, a switch circuit 22, a clock output circuit 23, logic circuits 24, 25, a delay circuit 26, a memory circuit 27 and a drive circuit 28. The temperature detection circuits 21a and 21b are for detecting the temperature of a controlled space in the refrigerator, such as a refrigerator compartment, which is controlled by the opening/closing plates 2a and 2b and the openings 7a and 7b, respectively. 1
temperature sensor 29, a resistance bridge circuit including a thermistor as a second temperature sensor 30, comparators 31, 32, an integrating capacitor 33,
34 and or gates 35 and 36. Further, the logic circuit 24 is connected to the temperature detection circuit 21.
This is a part that determines the starting conditions for the motor 3 by inputting the output signals of the output signals a and 21b, and includes logic elements, namely, NAND gates 37, 38, ... 50, knot circuits 51, 52, 53, 54, and capacitors 55, 5.
6, 57, 58 and an OR gate 59. The switch circuit 22 is a part that generates a signal for the switch 14 as a position detection means, and includes an integral element 60 and a knot circuit 61, 62 for waveform shaping.
and differential capacitors 63 and 64 connected to a power supply or ground. The clock output circuit 23 is a part that outputs a clock signal for setting a delay time, and is composed of a switching transistor 65 and the like. The logic circuit 25 receives the outputs of the logic circuit 24 and the switch circuit 22 as inputs to drive the motor 3.
This is to set the conditions for stopping the terminal in a predetermined operation mode, and the knot circuits 66, 67, 6
8, 69 and Nand Gate 70, 71,...75
and knot circuits 76, 77, 78, and 79. Further, the delay circuit 26 is for setting a delay time corresponding to the rotational drive amount of 90 degrees of the switch cam 13 after the motor 3 is started, and is connected to the NAND gates 81, 82, AND gates 83, 84, 85, 8.
6, a counter 87, a capacitor 88 for differentiation, and knot circuits 89 and 80 are combined. And logic circuit 25 and this delay circuit 2
The output of 6 is input to the reset input terminal of the memory circuit 27 via an OR gate 90 and a NOT circuit 91. On the other hand, the output of the logic circuit 24 is
2, and the memory circuit 27 via the knot circuit 94.
is input to the set input terminal of . This memory circuit 27
is composed of two NAND gates 95, 96 and NOT circuits 97, 98, which serve as flip-flops, and a part of the output is sent to the logic circuit 24.
It also serves as one input of NAND gates 37, 38, 39, and 40. A manual set circuit 101 is attached to the set input end of the memory circuit 27, and is connected to the input end of a NOT circuit 94 via a diode 93 for setting an OR condition.
The output of the memory circuit 27 is used to turn the power supply circuit of the motor 3 on or off by means of the switching transistor 99 and triax 100 of the drive circuit 28. Next, the operation of the motor actuator 1 will be explained. The motor actuator 1 has opening/closing plates 2a, 2
In order to make the opening/closing state of the switch cam 13 different, it has operation modes . Rotation angle of 90 degrees, 180 degrees, 270 degrees,
Compatible with 360 degrees. The opening and closing states of the release plates 2a and 2b at these rotation angles are as shown in the table below.

[Other embodiments of the invention]

In relation to one switch 14, the control circuit 20 of the above embodiment operates the delay means at a position other than the on/off position of the switch 14, so that the control circuit 20 can be stopped in four operation modes. By using two switch cams 13, the rotation angle can be detected every 90 degrees, so the delay circuit 26 can be omitted. Further, setting of such conditions is not limited to the control circuit 20 as in the above embodiment, but can also be realized by other logic. [Effects of the Invention] The present invention has the following unique effects. Since each driven member is controlled by the temperature conditions from the first and second temperature sensors, it is possible to set the temperature conditions for each driven member. Since multiple operating modes can be realized with one motor on one board, the space occupied by the entire device is smaller and the product price is lower than that using two motors. . The control circuit determines the operating mode based on the signal from the temperature sensor and starts the motor, and the position detection means detects the determined operating mode while the motor is rotating and stops the motor. Even if the temperature of the controlled object suddenly changes, the predetermined operating mode is reliably set, and transient unstable operating conditions are eliminated.

[Brief explanation of drawings]

Fig. 1 is a front view of a motor actuator for a refrigerator according to the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a vertical sectional view, and Fig. 4 shows a cam as a position detection means, a cam switch, and an operating mode. FIG. 5 is an exploded view of the cam, and FIG. 6 is a circuit diagram of the control circuit. 1...Motor actuator for refrigerator, 2
a, 2b... Opening/closing plates as first and second driven members, 3... Motor, 5... Board, 7a, 7
b...opening, 13...switch cam as position detection means, 14...switch as position detection means, 20...control circuit, 21a, 21b...temperature detection circuit, 29, 30...first and first 2 temperature sensor.

Claims (1)

[Claims] 1. A first operating mode in which one motor is driven by the motor and opens and closes according to the amount of drive of the motor, and the opening/closing states of the respective opening and closing states differ depending on the amount of drive of the motor set in advance. and a second driven member, a position detection means for detecting the operation modes of the first and second driven members from the drive amount of the motor, and two position detection means corresponding to the first and second driven members, respectively. Openings are formed, first and second driven members are provided to open and close these openings, and one substrate is provided with the motor and position detection means, and a controlled object that communicates with each opening is provided. A first and second device that detects the temperature in the space.
a temperature sensor, and a control circuit for controlling the drive amount of the motor, the control circuit determines an operation mode based on the signals from each temperature sensor and drives the motor, and the position detection means controls the drive amount of the motor. A motor actuator for a refrigerator, characterized in that the motor is stopped by detecting an operating mode of a driving member.