JPH03277882A - Motor actuator - Google Patents

Abstract

PURPOSE:To stop a rotor at an arbitrary revolution position by installing a driving means which is revolved by the drive of an electric motor and has an output means for a stop position signal on the surface and a detecting means for detecting the stop position signal. CONSTITUTION:A plurality of output means 16b-16e which represent the revolution positions are installed on the surface of a driving body 16 which is revolved by an electric motor. The output means 16b-16c are detected by a detecting means 17. Accordingly, the driving body 16 is stopped at an arbitrary position. Accordingly, when an opening/closing projection 16f is formed on the revolving driving body 16, the discharge ports 10e and 10f arranged in an inside peripheral shape can be directly opened and closed.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a motor actuator used in a damper opening/closing device installed in the air passage of a refrigerator-freezer, and in particular,
This invention relates to a motor actuator that can be stopped at any position.

(Conventional technology) In recent years, there has been a strong demand for highly accurate internal temperature control of refrigerators and multi-nitriding due to the diversification of internal temperatures. In place of the switching device, a damper switching device using an electric motor has been proposed, for example, as shown in Japanese Utility Model Application Publication No. 61-23673. However, the increase in the number of damper opening/closing devices due to multi-nitriding reduces the effective volume inside the refrigerator in order to secure the air passage, leading to an increase in cost9.
Japanese Patent No. 24084 proposes a motor actuator having one electric motor to control multiple rooms.

A conventional motor actuator and a damper opening/closing device using the same will be explained with reference to FIGS. 7 and 8.

FIG. 7 is a plan sectional view of a damper opening/closing device using a conventional motor actuator, and FIG. 8 is a diagram of the operation of the motor actuator.

In FIG. 7, the motor actuator includes one electric motor 1, two plate cams 3 and 4 attached to both ends of a drive shaft 2 perpendicular to the rotation axis of the motor, and two plate cams 3 and 4 attached to the rotation shaft and the drive shaft. It consists of a pair of fixed gears 5 for deceleration. The above-mentioned plate cams 3 and 4 are divided into four equal parts of 90 degrees each around the rotation axis, and the edges of the opposing quadrants are formed with large and small circular arcs, respectively, and the edges of the quadrants that connect these are formed with, for example, a constant acceleration curve. They are fixed to the drive shaft 2 with a phase shift of 90 degrees from each other.

A damper opening/closing device equipped with such a motor actuator is arranged in a control room (not shown) that has cold air outlets 6 and 7 communicating with the two storage compartments depicted by broken lines in the figure, and a cold air inlet. , the arm portions 8a and 9a of the opening/closing plates 8 and 9 that cover the cold air discharge ports 6 and 7 are connected to the plate cam 3, respectively.
and 4 to open and close.

Regarding the operation of the damper switching device configured in this way,
This will be explained with reference to FIG.

Followers (not shown) in contact with plate cams 3 and 4 provided on arms 8a and 9a are depicted as being in contact on the left side of the horizontal axis.

The opening/closing state of the opening/closing plates 8 and 9 varies depending on the contact quadrant of the follower that moves each and the plate cams 3 and 4. When the rotation angle of the drive shaft 2 is 0 degrees, the small arc of the plate cams 3 and 4 When the rotation angle is 90 degrees, it contacts the edges of the small arc of the plate cam 3 and the edge of the large arc of the plate cam 4 to close and open, and when the rotation angle is 180 degrees. When the plate cams 3 and 4 are both in contact with the edge of the large arc and are both open, when the one rotation angle is 270 degrees, the plate cam 3 is in contact with the edge of the large arc and the edge of the small arc of the plate cam 4. Open and close, rotation angle 36
At 0 degrees, it returns to the above-mentioned 0 degrees and is in a closed state.

In this way, one motor actuator can independently open and close the cold air discharge ports 6 and 7 of the two warehouses.

(Problem to be Solved by the Invention) However, in the above configuration, the opening/closing positions of the two opening/closing plates 8 and 9 are performed at the boundaries of the respective constituent quadrants of the plate cams 3 and 4. Due to variations in the rotation angles of the plate cams 3 and 4, the rotation angles of the plate cams 3 and 4 vary, resulting in a problem that the above four modes cannot be reliably realized.

Also, a follower that contacts the plate cams 3 and 4.

Since a power transmission mechanism is required between the opening and closing plates 8 and 9, there is also the problem that the structure of the damper opening and closing device becomes complicated.

The present invention solves the above problems and provides a small motor actuator that can directly open and close a cold air outlet.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a drive body rotated by an electric motor, a plurality of output means provided on the surface of the drive body for indicating the rotational position, and the above-mentioned output means. It consists of a detection means for detecting.

(for production) , With the above configuration, the detection means uses the output signal.

The position of the driving body can be detected and the driving body can be stopped at an arbitrary position. Therefore, if an opening/closing protrusion is formed on the rotating driving body, it becomes possible to directly open/close the discharge ports arranged in a circumferential manner.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 to 6, taking a damper opening/closing device of a refrigerator-freezer as an example.

FIG. 1 is an exploded perspective view of a damper opening/closing device incorporating a motor actuator according to the present invention. M12 attached to the top surface of the body 10 with multiple screws 11 and the electric motor 1
3. The gear box 10b is composed of a speed reducer 114, a gear box 10b that houses the gear box, a support shaft 15° fixed to the gear box tab, a rotor 16 that is placed over the gear box, and a motor actuator that includes a micro switch 17.

Next, a motor actuator according to the present invention will be explained with reference to FIGS. 1 to 3.

Each rotating shaft of a gear train consisting of a plurality of gears of the reduction gear t14 is rotatably attached to the lid 14a of the opening of the gear box tab, and the large gear 14b on the input side forming the gear train
A small gear 13c formed on the rotating shaft of the electric motor 13 attached to the lower surface of the lid 14a meshes with the small gear 13c, and the small gear 14e on the output side passes through the through hole 10c of the gear box 10b and is inserted into the center of the ceiling surface of the rotor 16. It meshes with the large gear 16a fixed to 1! ! The rotation speed of the motive 13 is reduced to reduce the rotation speed of the rotor 16.
tell to.

The rotor 16 is rotatably supported by a support shaft 15 fixed at the center of the upper end surface of the gear box 10b, and has a circumferential surface thereof.
Vertical grooves 16b, 16c, 16d and 16e are formed which output different signals from one to four times every 90 degrees. Note that the rotor 16 is integrally formed with a damper portion 16f that is a component of a damper opening/closing device.

The microswitch 17 has a mounting protrusion 12 formed on the lower surface of the lid 12 so that the pin push button 17a falls into the vertical grooves 16b, 16c, 16d and 16s.
attached to a.

Moving on to FIG. 2, the vertical grooves 16b, 16 of the rotor 16 described above are shown.
c.

In 16d and 16e, the central angle of one groove width is A degree,
Consisting of four stones, the end of the final groove is χ when viewed counterclockwise.
axis or y-axis. Further, the damper portion 16f is formed in the direction of the vertical groove 16b.

Next, the box 10 will be explained with reference to FIG.
On the rear side, there is a cold air population 10d that communicates with the outlet (not shown) of an air passage equipped with a cooler, and on both sides, there is a cold air outlet that communicates with the cold air outlet (not shown) of a separate storage room. 10e and 10f are formed.

Note that the lid 14a of the gear box 10b is fixed to the lower surface of the box body 10 with a plurality of screws 18.

FIG. 3 is a plan view of the damper opening/closing device according to the present invention, in which the rotor 16 of the motor actuator is attached to the center of the one-ring recess lOa, and the damper portion 16f is connected to the cold air population 1.
At the position where 0d is closed, the pin push button 17a of the microswitch 17 is engaged with the vertical groove 16b.

The operation of the damper opening/closing device configured as described above will be explained together with the operation of the motor actuator.

When a signal is input from a control circuit (not shown), the electric motor 13 rotates, and the signal is transmitted to the rotor 16 via the reduction gear 14.
The rotor 16 rotates within the annular recess lOa.

Next, a method for detecting the origin of rotation of the rotor 16 will be explained. As the rotor 16 rotates, the pin push button 17a of the microswitch 17 sequentially moves into the vertical grooves 16b, 16c, and 16d.
and 16e, repeating 0N10FF, 1
ON after rotation and 0N10FF increases from 1 to 4 times
It is detected by inputting it into the control circuit as the origin. The electric motor 13 stops at the origin of the rotor 16, and the damper portion 16f closes the cold air inlet 10d. Here the cold air outlet fo
Assuming that e and 10f are connected to the first storage room and the second hermitage, respectively, when the temperature of both storage rooms is low,
The damper part 16f stops at the position where the cold air inlet 10d of the box 10 is closed, and stops the cold air from flowing in from the cold air intake 10d (Fig. 3).
When the storage room is low, the control circuit instructs the electric motor 13 to start operating, and the microswitch 17 turns the rotor 16 clockwise from the state shown in FIG.
When the 10FF signal is output and the control circuit stops the electric motor 13 at the second ON position, the cold air outlet 10e communicating with the first warehouse is closed (FIG. 4).

In addition, when the temperature in both storage compartments is high and cooling is required,
Similarly, rotate the rotor 16 clockwise to 0N10F.
F stops at three vertical grooves 16d, and both cold air outlets 10e
10f and the cold air population 10d (Fig. 5), and when it is desired to cool the first warehouse, the cold air outlet 10f is closed by stopping at the vertical groove 16e (Fig. 6).

(Effects of the Invention) As explained above, according to the present invention, a small and inexpensive motor actuator that can stop the rotor at any rotational position can be obtained, and if this is adopted in a refrigerator-freezer, it will be extremely small and reliable. A damper opening/closing device with high performance can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a motor actuator and a damper opening/closing device equipped with the motor actuator according to the present invention. Figure 2 is a plan view of the rotor of the motor actuator;
4, 5, and 6 are plan views for explaining the operation of the damper opening/closing device, FIG. 7 is a plan sectional view of a conventional motor actuator, and FIG. 8 shows the motor actuator in the damper opening/closing device. This is the movement clothing when assembled. ■, 13...Electric motor, 2...Drive shaft, 3゜4・
...Plate cam, 5...Bevel gear, 6,7...Cold air discharge port, 8,9...Opening/closing plate, 8a. 9a...Arm part, 10...Box body, 10a...
Annular recess, tab...gear box, 10c...through hole. 10d...cold air inlet, lOa, lOf...cold air outlet, 11, 18-...screws, 12.14a-lid,
12a - mounting protrusion, 13a... small gear, 14
...Reduction gear, 14b...Input large gear, 14c
...output small gear, 15...support shaft, 16...
・Rotor, 16a-large gear, 16b, 16c, 1
6d, 16e=vertical groove, 16f...damper part,
17...Micro switch, 17a...Pin push button

Claims (1)

[Claims] A motor actuator consisting of a driving electric motor, a driving body that is rotated by the electric motor and has a stop position signal output means formed on its surface, and a detection means that detects the stop position signal.