JPH087834Y2 - Motor actuator operating range control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a motor actuator for reciprocally controlling the operation of a valve of a hot water supply device or the operation of doors of an air conditioner for an automobile, and particularly to its operating range. The present invention relates to an operation range regulation circuit that regulates the positions of both ends of the.

[Prior Art] Generally, in this type of motor actuator, a conductive brush is attached to the final large gear of the reduction gear group that reduces the rotational output of the DC motor, and a conductive pattern is formed on the printed circuit board facing the brush. Is forming. The electric power supply to the motor is cut off due to the contact relationship between the brush and the conductive pattern, and the positions of both ends of the operating range of the motor actuator are regulated.

In such an operation range regulation circuit, the positions of both ends of the conventional circuit are fixed, and the positions of both ends cannot be changed.

[Problems to be Solved by the Invention] In a valve provided in a hot water supply pipe of a hot water supply device, particularly in a valve that also serves as water stoppage and flow rate adjustment, the valve is fully closed (stopped water state) or fully open. Operations are controlled between. That is, one end side of the operating range must be completely closed (water stop state). Therefore, in the motor actuator used for controlling the valve of such a hot water supply device, the stop position on the one end side is in the water stop state.

FIG. 4 shows the relationship between the flow stroke and the moving stroke of the valve (valve for both water shutoff and flow rate adjustment) in the hot water supply device.
As shown in this figure, generally, at the moment the valve starts to open from a water stop state where the flow rate is zero, the flow rate suddenly increases to some extent due to the generation of a flow through a gap around the valve. Q in FIG. 4 is the flow rate in the steeply rising portion.

Therefore, when the flow rate is in the controlled state of controlling the flow rate near Q, particularly between zero and Q, the device is
A state of violent reciprocation between the stopped state and the state of the flow rate Q is caused, which causes noise and a failure, which is very inconvenient.

The present invention, in order to overcome such drawbacks of the prior art,
It is an object of the present invention to provide an operation range control circuit for a motor actuator that can switch the position of the end of the operation range.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the operating range restriction circuit of the motor actuator of the present invention is a conductive member attached to a rotating body (11) which is rotationally driven by a DC motor (3). A brush (13), a first conductive pattern (25a) arranged so as to come into contact with the conductive brush (13) in the entire rotation range of the conductive brush (13), and the conductive brush (13)
A second conductive pattern (25b) arranged so as to come into contact with the conductive brush (13) together with the first conductive pattern (25a) up to near one end of the rotation range of the second conductive pattern (25b);
Of the second conductive pattern (25b) simultaneously with the first conductive pattern (23a) and in contact with the conductive brush (13) only outside the rotation range of the conductive brush (13) of the second conductive pattern (25b). ) And the conductive brush (1
3) a third conductive pattern (25c) arranged so as not to come into contact with the third conductive pattern (25a, 25a)
b) A fourth portion which is arranged so as to straddle a position simultaneously contacting the conductive brush (13) and a position simultaneously contacting the first and third conductive patterns (25a, 25c) and the conductive brush (13). Conductive pattern (25d) and the second and third
Between the conductive patterns (25b, 25c) and the above second and fourth
Between the conductive patterns (25b, 25d) of each of the diodes (26, 27) connected in the same direction as seen from the second conductive pattern (25b), and the second and fourth conductive patterns (2
5b, 25d) is provided with a switch (29) connected in parallel with the diode (27), the power supply circuit (21) and the motor (3) are connected in series, and both terminals thereof are connected to the above-mentioned terminals. First
Conductive pattern (25a) and the second conductive pattern (25a)
b) and the stop position of the motor (3) when the conductive brush (13) is rotated to one end side of the rotation range opens and closes the switch (29). This switches between a position where the conductive brush (13) is disengaged from the second conductive pattern (25b) to the outside and a position where the conductive brush (13) is disengaged from the fourth conductive pattern (25d) to the outside. It is characterized by doing so.

[Operation] The position of the end of the operating range of the motor actuator is switched to a plurality of different positions by the switch.

[Example] An example will be described with reference to the drawings.

2 and 3 are sectional views of a motor actuator 1 according to an embodiment of the present invention. In the figure, 2 (2a, 2b) is a plastic housing for enclosing the motor actuator 1, which is formed by being divided into a lower housing 2a and a lid-shaped upper housing 2b.
a is fixed to each other with screws.

Reference numeral 3 is a drive motor, and a reversible rotation type DC motor is used. A worm 3a meshing with the reduction gear train 4 is attached to the output shaft of the drive motor 3, and the rotation of the drive motor 3 is reduced by the reduction gear train 4. In addition,
The teeth of each gear of the reduction gear train 4 are simply illustrated in FIG. 3 by an abbreviated drawing method.

Reference numeral 5 is a rack connected to the operated object 30. In the present embodiment, the actuated object 30 is a valve that is provided in the hot water supply pipe 32 of the hot water supply device for both water stoppage and flow rate adjustment, and the rod 31 that drives the valve 30 is fixed to the rack 5 by the E ring 6. Has been done. The rack 5 meshes with a rack drive gear 7, which is a final stage small gear of the reduction gear train 4, and is connected to the housing 2
Moves back and forth in a straight line.

In FIG. 3, reference numeral 13 is a conductive brush formed of a conductive material, which is the final stage large gear 11 of the reduction gear train 4.
It is attached to the back of. Reference numeral 14 is a printed circuit board made of an electrically insulating material, and a conductive pattern 25 is formed on a surface of the printed circuit board 14 facing the conductive brush 13.

FIG. 1 is a circuit diagram of an operating range regulation circuit including the conductive pattern 25. The conductive pattern 25 is a concentric three-row circular arc pattern, and the inner pattern 25a is a common electrode that is always in contact with the conductive brush 13. One of the conductive patterns 25b in the middle row is formed to be relatively long, while the two short conductive patterns 25d and 25e in the outer row and the short conductive patterns 25c in the middle row are arranged in a zigzag pattern.

3 and 13 are the above-mentioned drive motor and conductive brush.
Diodes 26, 27, 28 are connected between the longer conductive pattern 25b in the middle row and the other three shorter conductive patterns 25c, 25d, 25e, respectively. A switch 29 is provided in parallel with the diode 27 connected to the conductive pattern 25d in the outer row located between the two conductive patterns in the middle row. The switch 29 is provided outside the motor actuator at a position where it can be easily operated.

Reference numeral 20 is a valve opening / closing control circuit that outputs a control signal for controlling the opening degree of the valve 30. The control circuit 20 feeds back a detection signal output from an angle detector (not shown) provided in the large gear 11, for example, and outputs a control signal to the power supply circuit 21. As a result, the output from the power supply circuit 21 switches to positive, negative, or zero.

When a current flows in the drive motor 3 in the I direction, the conductive brush 13 rotates in the R direction to drive the valve 30 in the closing direction. When a current flows in the opposite direction, the conductive brush 13 moves in the opposite direction to R. Rotate and valve 30 opens.

The embodiment apparatus configured as described above operates as follows.

A) When the electric current flows through the drive motor 3 in the I direction When the switch 29 is closed, the conductive brush 13
The drive motor 3 can rotate within a range in contact with the conductive patterns of 25b and 25d. Therefore, when the conductive brush 13 that rotates in the R direction by the rotation of the drive motor 3 reaches the position of, that is, the position deviated from the conductive pattern of 25d, the power supply to the drive motor 3 is cut off and the drive motor 3 stops. To do. In the apparatus of this embodiment, this position is set to the water stop position of the valve 30.

In this state, if the output voltage of the power supply circuit 21 is inverted, the current in the direction opposite to the I direction will flow to the drive motor 3 through the diode 26 and the conductive pattern 25c, and the valve 30 will open. Operate. As a result, the conductive brush 13 becomes R
Rotate in the opposite direction.

When switch 29 is open, conductive brush 13
The drive motor 3 is rotatable only in the range in contact with the conductive pattern b, and the conductive brush 13 rotates in the R direction.
When reaching the position of, that is, the position deviated from the conductive pattern of 25b, the power supply to the drive motor 3 is cut off and the drive motor 3 stops. In this position, valve 30 is set slightly open, as shown in FIG.

Therefore, if the switch 29 is opened, the control circuit 20
Even if a control signal instructing to stop the water is output from, the water is not stopped and the minimum flow rate Q ′ always flows. This eliminates noise and the like during the minute flow rate control.

If the output voltage of the power supply circuit 21 is inverted in the stopped state, a current in the direction opposite to the I direction flows through the drive motor 3 through the diode 27 and the conductive pattern 25d.
The valve 30 operates in the opening direction. This allows the conductive brush
13 rotates in the direction opposite to the R direction.

B) When a current flows in the drive motor 3 in the direction opposite to the I direction At this time, when the conductive brush 13 rotates in the direction opposite to the R direction and reaches a position of, that is, a position deviated from the conductive pattern of 25b. The power supply to the drive motor 3 is cut off and the drive motor 3 stops. This position is the fully open state of the valve 30.

Then, if the output voltage of the power supply circuit 21 is reversed in this state, a current in the I direction flows through the drive motor 3 through the diode 28 and the conductive pattern 25e, and the valve 30 operates in the closing direction. As a result, the conductive brush 13 rotates in the R direction.

The present invention is not limited to the above embodiment, and the stop positions at one end of the operating range may be switched to three or more positions, and the stop positions may be switched to a plurality of positions at both ends. You may allow it. Further, it may be used for the operation control of various devices other than the valve operation control of the hot water supply device.

[Effect of the Invention] According to the operating range restriction circuit of the motor actuator of the present invention, the position of the end of the operating range of the motor actuator can be switched to a plurality of different positions.
It has an excellent effect that the most preferable operation range can be selected according to the operation characteristics of the object to be operated.

[Brief description of drawings]

1 is a circuit diagram of an embodiment, FIG. 2 is a plan sectional view of a motor actuator of the embodiment, FIG. 3 is a front sectional view of a motor actuator of the embodiment, and FIG. 4 is a movement stroke of a valve of a water heater. It is a diagram showing the relationship with the flow rate. 1 ... Motor actuator, 3 ... Drive motor, 11 ...
… Large gear, 13 …… conductive pattern, 14 …… printed circuit board,
21 …… power supply circuit, 25 …… conductive pattern, 26, 27, 28 …… diode, 29 …… switch, 30 …… valve, 31 …… rod,
32 …… Hot water supply line.

Claims (1)

[Scope of utility model registration request] 1. A conductive brush (13) attached to a rotating body (11) rotatably driven by a DC motor (3), and the conductive brush (13) in the entire rotation range of the conductive brush (13). The first conductive pattern (25a) arranged so as to come into contact with the first conductive pattern (25a) together with the first conductive pattern (25a) up to the vicinity of one end of the rotation range of the conductive brush (13). A second conductive pattern (25b) arranged so as to come into contact with the first conductive pattern (25b) only outside the rotation range of the conductive brush (13) with respect to the second conductive pattern (25b). 23a) a third conductive pattern (25c) arranged so as to contact the conductive brush (13) at the same time and not to contact the conductive brush (13) at the same time as the second conductive pattern (25b); With the first and second conductive patterns (25a, 25b) A fourth conductive pattern which is arranged so as to straddle a position that sometimes contacts the conductive brush (13) and a position that simultaneously contacts the conductive brush (13) at the same time as the first and third conductive patterns (25a, 25c). (25d) and the second conductive pattern (25b) between the second and third conductive patterns (25b, 25c) and between the second and fourth conductive patterns (25b, 25d), respectively. A diode (26, 27) connected in the same direction as viewed from above, and a switch (29) connected in parallel with the diode (27) between the second and fourth conductive patterns (25b, 25d). Is provided, the power supply circuit (21) and the motor (3) are connected in series, and both side terminals thereof are connected to the first conductive pattern (25a) and the second conductive pattern (25b), The motor (3) when the conductive brush (13) is rotated toward one end of the rotation range. The stop position of the switch (2
By opening and closing 9), the second conductive pattern (2
5b) to the outside where the conductive brush (13) comes off,
An operating range control circuit for a motor actuator, characterized in that the conductive brush (13) is switched from the fourth conductive pattern (25d) to the outside.