JPH10299931A - Flow control valve and its assembling method and open/ close control method of valve body and valve element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow control valve capable of reducing the impact or the load with simple control in case of closing a valve element. SOLUTION: A flow control valve is provided with a flow control valve main body section 20 where a valve element 32 to adjust the flow is opened and closed by a turning movement of an adjusting axis 35 and provided with a motor section turning and moving the adjusting axis 35. The motor section and the flow control valve main body section 20 are assembled so as to advance the prescribed angle of the direction to close up the valve 32 from the predetermined stop angle where an output axis of the motor section can detect its stop position when the valve element 32 is fully closed. Since the valve element 32 doesn't become the closed state at the time when the motor section reaches a stop angle, if the valve element 32 is gradually closed at low speed from the stop angle position, the valve element 32 can be fully closed without applying the impact or the heavy load to the motor and the durability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control valve having a flow control valve body for opening and closing a valve body for adjusting a flow rate by rotating a predetermined adjusting shaft, and a motor unit for rotating the adjusting shaft. The present invention relates to a control valve, a method of assembling the same, a valve body opening / closing control method, and a valve body.

[0002]

2. Description of the Related Art Conventionally, in a flow control valve used as a water flow control valve of a water heater, a valve is opened and closed by a drive motor, and when the valve is closed from an open state to a closed state, the drive valve is closed. Turn the motor on until the valve moves from the open state to the fully closed state.
It is designed to be driven at a predetermined constant speed.

In a conventional flow control valve, for example, a valve element having a truncated cone shape is inserted into a circular opening serving as a fluid inlet from the distal end thereof, and the opening degree of the valve is determined by the amount of insertion. Was to be adjusted.

[0004]

However, in such a conventional technique, when the valve body is closed from the open state to the fully closed state, the motor continues to be driven at a constant speed during that time. A large impact or load is applied to the motor at the moment when it hits the part. For this reason, there is a problem that a motor for driving these valve bodies and a driving gear are deteriorated or damaged, which is not preferable in terms of durability. Further, when the valve element has a shape such as a truncated cone, it is difficult to associate the rotation angle of the motor that opens and closes the valve element with the flow rate, and it is difficult to control the flow rate as intended.

[0005] The present invention has been made in view of the problems of the prior art.
A second object is to provide a flow control valve, a method of assembling the same, and a method of controlling the opening and closing of the valve body, which can suppress the impact and load when closing the valve body by simple control. An object of the present invention is to provide a valve body capable of adjusting a flow rate to a reference.

[0006]

The gist of the present invention to achieve the above object lies in the following inventions. [1] A flow control valve body (2) in which a valve body (32) for adjusting a flow rate is opened and closed by rotation of a predetermined adjustment shaft (35).
0) and a motor unit (4) for rotating the adjustment shaft (35).
0), the output shaft (43) of the motor section (40) for rotating the adjustment shaft (35) when the valve body (32) is fully closed. The motor section (40) and the flow control valve body section (2) are set so that the angle is advanced by a predetermined angle in a direction to close the valve body (32) from a predetermined stop angle at which the stop position can be detected.
0) and a flow control valve (20, 40).

[2] Valve body (32) for adjusting the flow rate
Is a flow control valve assembly method in which a motor unit (40) for rotating the adjustment shaft (35) is assembled to a flow control valve body (20) that opens and closes by rotating a predetermined adjustment shaft (35). The output shaft (43) of the motor unit (40) for rotating the adjustment shaft (35) when the valve body (32) is fully closed is set at a predetermined stop angle at which the stop position can be detected. A method for assembling a flow control valve, comprising: assembling the motor section (40) to the flow control valve body (20) so as to have an angle advanced by a predetermined angle in a direction in which the valve body (32) is closed.

[3] A valve element (32) for adjusting the flow rate
Of the flow control valve body (20), which opens and closes by rotating a predetermined adjustment shaft (35), and a motor unit (40) for rotating the adjustment shaft (35). A flow control valve assembling method, wherein the motor unit (40) is assembled to the flow control valve body (20) by fitting the output shaft (43) concentrically with the output shaft (43). 43) and one of the adjusting shafts (35) is provided with a plurality of grooves on the inner peripheral surface thereof extending in parallel with the shaft at substantially equal angular intervals, and the other shaft is provided on the outer peripheral surface thereof with the one of the grooves. At least one convex tooth that engages a groove formed on the inner circumference of the shaft
The flow control valve body (20)
The valve body (32) is fully closed, and the motor unit (4) is closed.
0), the output shaft (43) is set at an angle advanced by a predetermined angle in the closing direction of the valve body (32) from a predetermined stop angle at which the stop position can be detected, and is held. When the output shaft (43) and the adjustment shaft (35) are fitted in a state where the output shaft (43) is adjusted to a predetermined mounting position for mounting the fluid control valve body (20) on the fluid control valve body (20), The phase of the tooth and the groove does not match, and the output shaft (43)
When the adjustment shaft (35) and the adjustment shaft (35) do not fit together, the motor unit (40) is rotated in the direction in which the valve body (32) is closed until the phase of the convex teeth and the phase of the groove match. (4
3) and the adjustment shaft (35) are fitted, and then the motor part (40) is turned in a direction opposite to the closing direction to return to the assembly position, and the motor part (40) is subjected to the fluid control at the position. A method for assembling a flow control valve, wherein the flow control valve is fixed to a valve body (20).

[4] A valve element (92) for adjusting the flow rate
Are provided with a flow control valve body (80) that opens and closes by rotating a predetermined adjustment shaft (99) and a motor unit (40) that rotates the adjustment shaft (99). A predetermined stop at which an output shaft (43) of the motor section (40) for rotating the adjustment shaft (99) when the valve element (92) is fully closed can detect a stop position thereof. The valve element (92) in which the motor part (40) and the flow control valve body part (80) are assembled so that the angle is advanced by a predetermined angle in a direction in which the valve element (92) is closed from the angle. In the valve element opening / closing control method for opening and closing the valve, when closing the valve element (92) from the open state to the fully closed state, the output shaft of the motor section (40) is detected until the stop angle is detected. (43) at a first speed in the closing direction of the valve body (32). Rotating the output shaft (43) at a second speed lower than the first speed and gradually closing the valve body (92) to a fully closed state. .

[5] From the stop angle, the output shaft (4
3) When the valve is rotated at the second speed, a reference drive time longer than a maximum time required for the valve body (32) to be fully closed is determined in advance, and the output shaft (43) is set to the stop angle. Driving the motor section (40) at the second speed uniformly from when the reference drive time elapses until the valve body (32) is gradually closed to the fully closed state. The valve body opening / closing control method according to [4], which is characterized in that:

[6] The valve element (92) has a function of stopping water with an elastic member, and the output shaft (43) is controlled from the stop angle.
The valve opening / closing control method according to [4] or [5], wherein the valve is turned at the second speed to stop water.

[7] The flow control valve according to [1] (20, 8)
0) or a valve element (32, 92) applied to a flow control valve (20, 80) assembled by the flow control valve assembling method according to [2] or [3].
A valve body (32) characterized in that its shape is set so that the change amount of the rotation angle of the output shaft (43) and the change amount of the flow rate in the flow control valves (20, 80) are directly proportional to the change amount. , 9
2).

The present invention operates as follows. The flow control valve body (20) and the motor (40) are connected to the valve body (3).
2) Output shaft (43) of motor unit (40) when fully closed
The motor unit (40) has reached the stop angle since it is advanced by a predetermined angle in the closing direction of the valve body (32) from a predetermined stop angle at which the stop position can be detected. At this point, the valve element (32) does not become fully closed.

When closing the valve element (92) from the open state to the fully closed state, the output shaft (43) of the motor section (40) is rotated at a first speed until the stop angle is reached. An output shaft (43) at a second speed lower than the first speed;
Is rotated to gradually close the valve element (92) to the fully closed state.

Since the stop angle is set at a position closer to the front side than the valve element (92) is fully closed, even if the motor is turned at a first speed (high speed) at a stroke until the stop angle, a large impact or large load is applied to the motor. Is not added. And after the stop angle,
By driving the motor at a second speed (low speed),
The valve element (92) can be fully closed without applying an impact or a large load to the motor.

Further, if the valve element (92) is provided with a function of stopping water by an elastic member, the valve is gradually closed at the second speed to completely stop water without applying an impact or a large load to the motor. be able to.

After the stop angle, when the output shaft (43) is rotated at the second speed, a reference drive time longer than the maximum time required for the valve element (92) to fully close is determined in advance. The motor unit (40) is uniformly driven at the second speed from when the reference angle 43) reaches the stop angle until the reference drive time elapses. Thereby, the valve body (92) can be fully closed without actually detecting that the valve is fully closed, and the configuration of the device can be simplified.

Alternatively, the motor may be stopped by detecting that the valve element (92) is fully closed, based on the fact that the load applied to the motor after the fully closed state is increased. For example, the fully closed state can be detected by a change in the value of the current flowing through the motor.

Further, a groove extending parallel to the shaft is provided on the inner peripheral surface of one of the adjusting shaft (35) and the output shaft (43), and a convex engaging with the groove is formed on the outer peripheral surface of the other shaft. An adjusting shaft (35) and a motor unit (40) for rotating the adjusting shaft (35), wherein the adjusting shaft (35) has at least one tooth.
When the output shaft (43) is fitted concentrically with the output shaft (43), the groove provided on the inner peripheral surface of one shaft (43) and the convex teeth provided on the outer peripheral surface of the other shaft (35) Is to engage
The motor section (40) is assembled to the flow control valve body section (80) in the following procedure.

For example, it is assumed that grooves are formed on the inner peripheral surface of the output shaft (43), and convex teeth are formed on the outer peripheral surface of the adjustment shaft (35). First, the valve body (32) of the flow control valve body (20) is fully closed and the motor (40)
The output shaft (43) is set at an angle advanced by a predetermined angle in the closing direction of the valve element (32) from a predetermined stop angle at which the stop position can be detected. Next, the motor unit (4
The output shaft (43) and the adjustment shaft (35) are fitted together with the fluid control valve body (0) aligned with the mounting position of the fluid control valve body.

In this case, if the phases of the convex teeth on the outer peripheral surface of the adjusting shaft (35) and the grooves on the inner peripheral surface of the output shaft (43) do not match, and they do not fit together, the convex teeth and the grooves The motor unit (40) is turned in the closing direction of the valve body (32) until the output shaft (43) and the adjustment shaft (35) are fitted into each other until the phase of the motor unit (40) is matched. To return to the assembling position, at which position the motor part (40) is fixed to the fluid control valve body.

By taking such an assembling procedure, the angle of the output shaft (43) when the valve body (32) is fully closed always changes the initial phase shift between the groove and the convex teeth. Is absorbed in the direction in which it moves in the closing direction. As a result, the variation in the rotation angle required from the stop angle to the fully closed state of the valve element (32) is reduced by half compared to the case where the initial phase shift is absorbed in an arbitrary direction.

The shape of the valve element (32, 92) applied to such a flow control valve (20, 80) is determined by changing the shape of the motor section (40).
Of the rotation angle of the output shaft (43) and the flow control valve (2)
(0, 80), the flow rate can be easily controlled to an intended value by the rotation angle of the motor if the flow rate is set to be directly proportional to the change amount. The valve body (32, 92) has, for example, a convex curve shape in which the peripheral surface is expanded outward with respect to the truncated cone shape.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a schematic configuration of a water heater using the flow control valve according to the present invention. The water heater is
The combustion chamber 10 is provided.
A burner 11 is provided above the combustion chamber 10.
Heat exchangers 12 for transferring heat from the feed water to the water supply are arranged. Air is supplied to the burner 11 from below the combustion chamber 10 by the combustion fan 13, and exhaust gas is discharged from the upper part of the combustion chamber 10.

The water supply pipe 14 communicates with the inlet of the heat exchanger 12, and a hot water pipe 15 is connected to the outlet of the heat exchanger 12. In the middle of the hot-water supply pipe 15, a main-side water amount control valve 20 for adjusting the amount of hot water that has been heated by the heat exchanger 12 is attached. The water supply pipe 14 and the hot water supply pipe 15 are connected by a bypass 17 on the downstream side of the main-side water flow control valve 20.
Hot water pipe 15 without passing through the heat exchanger 12
A bypass-side water amount control valve 80 for adjusting the amount of water to be bypassed is provided.

In addition, the water heater shown in FIG. 2 has a function of supplying hot water to the bath and reheating the bath, and is provided with a bath outgoing pipe 19a and a bath returning pipe 19b leading to the bathtub.

FIGS. 3 and 4 show an exploded view of the main-side water amount control valve 20, and FIG. 1 shows a cross section of the main-side water amount control valve 20, respectively. The main-side water flow control valve 20 is
A water regulating body 23 as a casing having a fluid inlet 21 and an outlet 22, and a water regulating section 30 housed inside the water regulating body 23 and adjusting a flow rate from the inlet 21 to the outlet 22. Have. The water regulating body 23 has a substantially cylindrical shape, and an outlet 22 is provided on a side portion thereof. The outlet 22 has a short circular cylindrical shape extending substantially vertically from the side surface of the water control body 23.

The main-side water flow control valve 20 is provided with a water-conditioning plate 24, a water-conditioning unit 30 placed in a water-conditioning body 23, a cover with a water-conditioning mounting plate 25, and a pan-head screw 26. 25 is fixed to the water control body 23 and assembled.

As shown in FIG. 4, the water control section 30 includes a push nut 31, a valve element 32, a body joint 33, an O-ring 34, and a water control shaft 35. The water conditioning shaft 35 has an O-ring 34
And a grease reservoir 37 for storing grease.

The water conditioning shaft 35 is a so-called serration shaft, and its outer peripheral surface is provided with a number of convex teeth extending parallel to the shaft. A total of 16 convex teeth are provided at equal angular intervals of 22.5 degrees. Valve 32
Has a substantially frustoconical shape, but its peripheral surface has a shape of a convex curve slightly bulging outward.

The valve body 32 of the main-side water amount control valve 20 rotates the water control shaft 35 so that the water control shaft 3
5 in the axial direction, and turning the water adjustment shaft 35 by approximately 180 degrees from the fully opened state, the valve body 32 is almost in the closed position, and the valve body 32 is fully rotated at a predetermined angle of 188 degrees or more (depending on an assembly error). It is designed to close.

FIG. 5 shows a motor section 4 for driving the water quantity control valve.
0 shows a cross section of a main part. The motor unit 40 includes a motor 41 and a reduction gear unit 42 inside. Output shaft 43
Is downward in the figure, and the main-side water flow control valve 2
It is a female type for fitting the zero water-conditioning shaft 35. A groove 44 is formed on the inner peripheral surface of the output shaft 43 to engage with the convex teeth of the water conditioning shaft 35. Groove 44
As with the convex teeth of the water conditioning shaft 35, a total of 16 teeth are provided at equal angular intervals of 22.5 degrees.

The output shaft 43 of the motor section 40 is
, But the output shaft 43 cannot be easily rotated even when an external force is applied because of the reduction gear portion 42.

The motor section 40 has a circuit board 45 including a Hall IC 47 in which a Hall element and peripheral circuits are integrated into one chip. The output shaft 43 has a Hall IC
A magnet 49 is attached to a location corresponding to 47.
The Hall IC 47 detects the rotational position of the output shaft 43 based on the presence or absence of a magnetic force from the magnet 49.

FIG. 6 shows a Hall IC of the motor section 40.
47 shows an output waveform. The Hall IC 47 can detect the rotation angle of the output shaft 43 at two points of 0 degree and 180 degrees. The Hall IC 47 outputs a position detection signal 61 consisting of two values, high level (H) and low level (L). If the point 62 where the value of the position detection signal 61 changes from low level to high level is the position of the rotation angle 0 degree, the point 63 where the position detection signal 61 changes from high level to low level is the position of the rotation angle 180 degree. Become.

Next, the configuration of the bypass side water amount control valve 80 will be described.

FIGS. 7 and 8 show a bypass-side water amount control valve 80.
FIG. 9 shows a state in which the water flow control valve 80 is disassembled.
Respectively represent cross sections. Bypass side water flow control valve 8
Reference numeral 0 denotes a water regulating body 83 having a fluid inlet 81 and an outlet 82, and an inlet 8 accommodated inside the water regulating body 83.
And a water adjusting section 90 for adjusting the flow rate from 1 to the outlet section 82.

The bypass side water amount control valve 80 is
Of the water control spring 84 into the water control shaft 95 of
Further, the water-conditioning packing 9 is sandwiched between the water-conditioning parts 9.
0 is stored in the water-conditioning body 83, and the water-conditioning mounting plate 86 is covered with the water-conditioning mounting plate 86.
3 and assembled.

As shown in FIG. 8, the water adjusting section 90 includes a push nut 91, a valve element 92, a water adjusting sheet 93, a water adjusting guide 94, a water adjusting shaft 95, a spring pin 96, a body joint 97, and an O-ring 98. And water bearing 9
9.

The water adjusting bearing 99 has an O-ring insertion point 100 for fitting the O-ring 98 into an intermediate portion thereof.
And a grease reservoir 101 for storing grease. The valve element 92 has a substantially frustoconical shape, but its peripheral surface has a convex curve shape slightly bulging outward. Further, at least a portion near the push nut 91 of the valve body 92 is formed of rubber as an elastic member so that water can be completely stopped when the valve body 92 is closed.

The valve element 92 of the bypass side water amount control valve 80 is
By rotating the water adjustment bearing 99, the water adjustment bearing 99 is rotated.
When the water adjustment bearing 99 is turned by approximately 90 degrees from the fully opened state, the valve element 92 is brought to the closed position, and at a predetermined angle advanced by 8 degrees or more from the closed position (depending on an assembly error). It is completely closed and completely shut off.

The motor section 40 for driving the water regulating section 90 is substantially the same as that for driving the main-side water quantity control valve 20, and the description thereof is omitted. However, the angle at which the Hall IC 47 detects the position is determined by the main-side water quantity control valve. 20 is different from the motor unit attached to the motor unit 20.

FIG. 10 shows an output waveform of the Hall IC 47 of the motor unit 40 attached to the water control unit 90. The Hall IC 47 can detect the rotation angle of the output shaft 43 every 90 degrees. The position detection signal 111
Consists of two values, a high level (H) and a low level (L).

If the point 112 where the position detection signal 111 changes from low level to high level is a position with a rotation angle of 90 degrees, the point 113 where the position detection signal 111 changes from high level to low level is a position with a rotation angle of 180 degrees. Becomes Therefore, the valve element 92 is in a closed position in which the output shaft 43 is almost closed at a position of 180 degrees, and is fully closed at a predetermined angle of 188 degrees or more to be in a water-stop state.

FIG. 11 shows the drive control circuit 1 of the motor section 40.
20 is shown. The drive control circuit 120 includes the motor unit 4
A motor drive circuit 121 that supplies drive power to the motor unit 0, and an opening / closing control unit 122 that integrally controls the rotation direction, rotation speed, rotation on / off, and the like of the motor unit 40 are provided. The motor drive circuit 121 includes a pulse width control unit 123 that changes the rotation speed of the motor unit 40 according to the duty ratio of the current.

The opening / closing control section 122 receives the position detection signals 61 and 111 from the Hall IC 47 and an opening / closing operation instruction signal 124, and based on these signals, the opening / closing control section 122 sends a motor driving circuit 121 to the motor driving circuit 121. A control signal 125 indicating the driving content of the unit 40 is transmitted.

Next, a procedure for mounting the motor section 40 on the main-side water flow control valve 20 will be described. As a preparation for assembling the motor unit 40 to the main-side water amount control valve 20, the valve body 32 of the main-side water amount control valve 20 assembled as shown in FIG. Further, the angle of the output shaft 43 of the motor unit 40 is set to the motor installation position 64 shown in FIG.

To set the mounting position 64, first, the output shaft 43 is driven until the position at 180 degrees (point 62) is detected by the Hall IC 47, and then the duty ratio of the driving current is reduced to about 30%. After setting, the motor unit 40 is driven in the direction in which the rotation angle advances for about one second. As a result, the output shaft 43 is set at an angle of about 188 degrees as the motor installation position 64. Here, the direction in which the rotation angle advances, that is, the direction in which the output shaft 43 rotates when the valve body 32 is closed, is clockwise.

After the main-side water amount control valve 20 and the motor section 40 have been initialized as described above, predetermined mounting positions (pin holes and the like are aligned) for fixing the motor section 40 to the main-side water amount control valve 20 with screws. Position), and the water regulating shaft 35 of the main-side water amount control valve 20 is fitted to the output shaft 43.

At this time, if the phase of the convex teeth on the outer peripheral surface of the water control shaft 35 and the groove 44 on the inner peripheral surface of the output shaft 43 are shifted, the output shaft 43 and the water control shaft 35 cannot be fitted. The motor unit 40 is turned in the direction in which the valve body 32 is closed, that is, clockwise, until the toothed teeth fit into the first grooves, and the water adjustment shaft 35 is fitted into the output shaft 43. Since the convex teeth and the grooves 44 of the output shaft 43 are provided at intervals of 22.5 degrees, the output shaft 43 and the water adjusting shaft 35 are fitted before turning the motor unit 40 clockwise at the maximum by 22.5 degrees. Combine.

Next, the motor unit 40 is turned counterclockwise to return to the mounting position where the pin holes and the like are aligned, and the motor unit 40 is moved to the main-side water quantity control valve 20 at this position.
And fix it. When the motor unit 40 is attached to the main-side water amount control valve 20 in this manner, the rotation angle of the output shaft 43 in a state where the valve body 32 is closed is in the range of 188 degrees (the initial installation position) to 210.5 degrees. Fits.
The procedure for attaching the motor unit 40 to the bypass-side water amount control valve 80 is the same as that described above, and a description thereof will be omitted.

Next, the drive control of the motor unit 40 when closing the valve body 32 of the main water amount control valve 20 assembled as described above from the open state to the closed position will be described.

Opening / closing control section 122 of drive control circuit 120
Receives an instruction to close the valve, drives the motor unit 40 at a predetermined high speed in the direction in which the valve body 32 closes (here, clockwise). At this time, the duty ratio of the current supplied to the motor unit 40 is set to about 70%, and the output shaft 43 rotates from 0 to 180 degrees over 7 to 10 seconds.

When the rotation angle of the output shaft 43 becomes approximately 180 degrees, the output waveform of the Hall IC 47 changes from the high level to the low level as shown in FIG.
Based on this, it is recognized that the output shaft 43 has rotated to the position of 180 degrees, and the driving of the motor unit 40 is stopped.

The main-side water quantity control valve 20 completes the closing operation at the position, and does not turn the main-side water amount control valve to the closed state. When the motor section 40 is assembled to the main-side water flow control valve 20 by the method described above, the valve body 32
Is fully closed, the rotation angle of the output shaft 43 is in the range of 188 degrees to 210.5 degrees, and is always larger than 180 degrees detected by the Hall IC 47.

Therefore, at the position where the position is detected by the Hall IC 47 at 180 degrees, the valve body 32 does not come into contact with the water regulating body 23, and no impact or large load is applied to the motor unit 40. For this reason, the position detected by the Hall IC 47 is 180.
The output shaft 43 of the motor unit 40 can be rotationally driven at a high speed such that the duty ratio becomes 100%, for example, and the time required for closing the valve can be shortened.

Next, the valve body 9 of the bypass side water amount control valve 80
The drive control of the motor unit 40 when the motor 2 is closed from the open state to the fully closed position will be described.

FIG. 12 shows the flow of operation performed by the drive control circuit 120 when closing the valve body 92 of the bypass-side water amount control valve 80 from the open state to the fully closed state. Upon receiving the instruction to close the valve (step S201; Y), the opening / closing control unit 122 drives the motor unit 40 at the first speed in the direction in which the valve body 92 closes (clockwise in this case). At this time, the duty ratio of the current supplied to the motor unit 40 is about 70
Set to percent.

When the rotation angle of the output shaft 43 becomes approximately 180 degrees, the output waveform of the Hall IC 47 changes from the high level to the low level as shown in FIG.
Recognizes that the output shaft 43 has rotated to the position of 180 degrees based on this. When detecting that the output shaft 43 has rotated to 180 degrees (Step S203; Y), the opening / closing control unit 122 sends an instruction to reduce the rotation speed of the output shaft 43 to the pulse width control unit 123, and receives the instruction. The pulse width control unit 123 reduces the duty ratio of the current supplied to the motor unit 40 to 30% (Step S20)
4).

The opening / closing controller 122 starts measuring the elapsed time from the time when the instruction to reduce the rotation speed of the output shaft 43 is sent (step S205), and when the predetermined reference drive time has elapsed (step S206; Y), the motor unit 40 is stopped (step S207).

When the motor 40 is assembled to the bypass-side water amount control valve 80 by the method described above, the rotation angle of the output shaft 43 when the valve body 92 is fully closed is from 188 degrees to 2 degrees.
The angle is in the range of 10.5 degrees, and is always larger than 180 degrees detected by the Hall IC 47.

Therefore, the output shaft 43 of the motor unit 40 can be driven to rotate at a relatively high speed up to 180 degrees detected by the Hall IC 47, and the time required for closing the valve can be shortened. Further, since the output shaft 43 is driven to rotate at a low speed after the position is detected, the valve element 92 is gradually closed, so that no shock or a large load is applied to the motor unit 40 when fully closed and water is stopped.

The reference drive time during which the motor section 40 is driven at a low speed is such that the output shaft 43 rotates from 180 degrees to 210.5 degrees, which is the largest variation, when rotated at the second speed. The time is set slightly longer than the required time. Thereby, the valve body 92 can be completely closed without detecting whether or not the valve body 92 is actually fully closed. In addition, in consideration of a margin for control while securing a stroke for moving the output shaft 43 at a low speed, the built-in position of the motor is advanced by about 8 degrees from 180 degrees which can be detected by the Hall IC 47 to 188 degrees. It has been set.

For example, when the valve element 92 is fully closed at 190 degrees, the motor section 40 is energized until the reference drive time elapses. Since the motor is driven at the speed of 2, the amount of current flowing through the motor unit 40 is small. For this reason, even if the power is supplied in a state where the motor cannot rotate, it is possible to prevent the motor coil from being burned out due to heat generation or the like. The second speed is desirably set to a speed at which the amount of current is reduced to such a degree that burning does not occur even if the rotation of the motor is forcibly stopped during the reference driving time.

In the above-described assembling method, the convex teeth of the water adjusting bearing 99 and the groove 44 of the output shaft 43 are formed when the motor portion 40 is initially set to the mounting position where the motor portion 40 is screwed to the bypass side water amount control valve 80. When the phase shift occurs, the worker is prevented from turning the motor unit 40 in the counterclockwise direction, not in the clockwise direction, and fitting the output shaft 43 and the water adjustment bearing 99. That is, even if the worker turns the motor unit 40 counterclockwise to fit the output shaft 43 and the water adjustment bearing 99, the motor unit 40 cannot be returned to the mounting position. .

Since the motor section 40 has the reduction gear section 42 therein as described above, the output shaft 43 does not rotate from the initially set installation position due to external force. Since the body 92 is locked in the fully closed state in the preparation stage of assembly, the water adjustment bearing 99 cannot be further turned clockwise (the direction in which the valve body 92 is closed). Thereby, when the motor shaft 40 is turned counterclockwise to fit the output shaft 43 and the water regulating bearing 99,
The motor unit 40 cannot be turned clockwise to return to the mounting position. As a result, the phase of the convex teeth of the water adjustment bearing 99 and the groove 44 of the output shaft 43 are always adjusted by rotating the motor unit 40 clockwise.

On the other hand, if the valve element 92 of the bypass-side water amount control valve 80 is not set to the fully closed state in the preparatory stage of assembly, the water regulating bearing 99 can be turned clockwise. Turn the part 40 counterclockwise to set the output shaft 43
Even when the water adjustment bearing 99 and the water adjustment bearing 99 are fitted, the motor unit 40 can be turned clockwise to return to the mounting position.

For this reason, when adjusting the phase, the operator can turn the motor unit 40 in either the clockwise direction or the counterclockwise direction, and when the output shaft 43 is fully closed with the valve body 92 fully closed.
The range of possible rotation angles becomes wide. For example, when the installation position of the output shaft 43 is set to 188 degrees, the range of the rotation angle that the output shaft 43 can take when the valve body 92 is fully closed is 188 degrees ± 22.5 degrees (16 degrees).
(5.5 degrees to 210.5 degrees), and the error range is twice as large as that in the case where the phase shift is regulated to be rotated counterclockwise and absorbed.

In order to control the motor unit 40 to rotate at a high speed to a position of 180 degrees detected by the Hall IC 47, and then to slow down the rotation speed and gradually close the valve body 92, the valve body The rotation angle of the output shaft 43 when the 92 is in the fully closed state must be larger than 180 degrees at which the position of the Hall IC 47 can be detected. For this reason, it is necessary to set the rotation angle of the output shaft 43 to 180 degrees + 8 degrees (a margin for a stop error or the like) +22.5 degrees (the interval between the groove and the teeth), that is, 210.5 degrees in the preparation stage of assembling.

At this time, with the valve body 92 fully closed, the output shaft 4
The range of possible rotation angles of 3 is 188 degrees to 233 degrees. After 180 degrees, the motor unit 40 is rotated at a low speed. Therefore, if the maximum rotation angle at the time of fully closing becomes large, it may take a long time to bring the valve body 92 into the fully closed state.
Since the reference drive time needs to be set based on 233 degrees, which is the maximum rotation angle in consideration of the variation, 188
When the valve element 92 is fully closed in the vicinity of the
The drive pulse is applied for a long time in a state where the motor cannot rotate, and the motor unit 40 is deteriorated.

Accordingly, the motor unit 4 is connected to the bypass-side water amount control valve 80 with the valve body 92 fully closed in the assembly preparation stage.
By assembling 0, the range of possible rotation angles of the output shaft 43 in the state where the valve body 92 is fully closed becomes narrower,
Accordingly, the reference drive time can be set short, and the motor unit 4
0 can be prevented from deteriorating.

In the case of the main-side water amount control valve 20, the valve body 32 is fully closed in the preparatory stage of assembly, and the motor section 40 is assembled to the main-side water amount control valve 20, so that the valve can be moved from the closed position (180 degrees). The variation range of the rotation angle until reaching the fully closed position is reduced. Thus, the flow rate at the closed position can be maintained at a sufficiently small amount.

Next, the shapes of the valve body 32 and the valve body 92 will be described. As shown in FIG. 13, usually, the forward movement of the valve body 131 changes the area (passing area) of the flow path generated in the gap between the inflow port 132 and the valve body 131, and the flow rate changes accordingly. . At this time, if the valve element 131 has a truncated cone shape, the valve element 131 is moved from the fully closed state to an arrow 13.
The relationship between the distance (stroke) moved in the direction 3 and the flow rate is represented by a curve 141 as shown in FIG. When the stroke is replaced with the passage area, a curve 151 as shown in FIG. 15 is obtained.

Next, for example, the flow rate up to the maximum flow rate is equally divided into five steps (a1 to a5), and the flow rate of each step is mapped to the passage area as shown in the graph of FIG. Can be obtained. That is, the passage area of each stage required to change the flow rate uniformly is obtained.

Next, the stroke amount of the valve element 131 from the fully closed state (stroke amount “0”) to the stroke amount at which the maximum flow rate can be obtained is divided into five equal parts (FIG. 16, d1 to d5).
When the passage areas s1 to s5 acquired in step 5 correspond to these stroke amounts d1 to d5, a curve 161 shown in FIG. 16 is obtained. That is, it is possible to obtain the size of the passage area to be secured for each stroke amount.

When the shape of the valve body 131 is determined based on the curve 161, the shape of the valve body 131 becomes a shape in which the peripheral surface bulges slightly outward to the shape of the truncated cone. When such a valve element is used, the flow rate with respect to the stroke amount becomes a straight line 171 represented by a linear function as shown in FIG. 17, and a relationship in which the stroke amount and the flow rate are directly proportional can be obtained.

Normally, the stroke amount of the valve body and the rotation angle of the motor are proportional. Therefore, for example, if a stepping motor is used, the flow rate per unit time can be controlled as intended by the number of pulses applied to the motor.

In the embodiment described above, the Hall IC
After passing the stop angle which can be detected by the motor 47, the motor unit 40 is uniformly driven at the second speed for the reference driving time obtained in advance, but the valve body is fully closed due to the magnitude of the load applied to the motor. It may be determined whether or not the operation has been performed, and the motor may be stopped when the valve element is fully closed. For example, it is possible to detect that the entire motor is completely closed based on a change in the amount of current flowing through the motor.

[0079]

According to the present invention, when the rotation angle of the output shaft of the motor unit in the state where the valve body is fully closed is changed from the predetermined stop angle at which the stop position of the output shaft can be detected to the closing direction of the valve body. The valve body does not enter the fully closed state when the motor section reaches the stop angle.
Therefore, the valve body can be closed at a high speed to the stop position.

In the case where the valve body is gradually closed at a low speed from the position of the stop angle, the valve body can be completely closed and water can be stopped without applying an impact or a large load to the motor. Can be improved.

Further, if the motor section is driven at a low speed uniformly until the predetermined reference drive time elapses from the stop angle, the valve element can be fully closed without detecting whether or not it is fully closed. Therefore, the device configuration can be simplified.

When the shape of the valve body is set so that the change in the rotation angle of the output shaft of the motor section and the change in the flow rate in the flow control valve are directly proportional, the flow rate is determined by the rotation angle of the motor. It can be easily controlled to the intended value.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main body of a flow control valve according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a water heater in which a flow control valve is applied to one embodiment of the present invention.

FIG. 3 is an explanatory view showing a state in which a flow control valve body according to one embodiment of the present invention is disassembled.

FIG. 4 is an explanatory view showing a state in which a water control section of the flow control valve body according to the embodiment of the present invention is disassembled.

FIG. 5 is a sectional view showing a motor section of the flow control valve according to one embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an output waveform of a Hall IC of a motor unit attached to a main-side water amount control valve.

FIG. 7 is an explanatory view showing a state in which a bypass-side flow control valve body according to one embodiment of the present invention is disassembled.

FIG. 8 is an explanatory view showing a state in which a water control section of a bypass-side flow control valve body according to one embodiment of the present invention is disassembled.

FIG. 9 is a cross-sectional view illustrating a main body of the bypass-side flow control valve according to the embodiment of the present invention.

FIG. 10 is an explanatory diagram showing an output waveform of a Hall IC of a motor unit attached to the bypass-side water amount control valve.

FIG. 11 is a block diagram illustrating a circuit configuration of a drive control circuit.

FIG. 12 is a flowchart illustrating a flow of an operation performed by a drive control circuit when closing a valve body of a bypass side water amount control valve from an open state to a fully closed state.

FIG. 13 is an explanatory view showing a frustoconical valve element.

FIG. 14 is an explanatory diagram showing a graph illustrating a relationship between a stroke amount of a frusto-conical valve element and a flow rate.

FIG. 15 is an explanatory diagram showing a graph in which the stroke amount in FIG. 14 is replaced with a fluid passage area.

FIG. 16 is an explanatory diagram showing a graph illustrating a relationship between a passage area and a stroke amount when the passage area obtained in FIG. 15 is made to correspond to stroke amounts that are equally divided.

FIG. 17 is an explanatory diagram showing a graph showing a relationship between a stroke amount and a flow rate when a valve body having a shape determined from the graph of FIG. 16 is used.

[Explanation of symbols]

 20: Main side water flow control valve 21, 81 ... Inlet part 22, 82 ... Outlet part 23, 83 ... Water control body 23 24, 85 ... Water control packing 25, 86 ... Water control mounting plate 26, 87 ... Pan screw 30, 90 ... Water regulation parts 31, 91 ... Push nuts 32,92 ... Valve bodies 32 33,97 ... Body joints 34,98 ... O-ring 35 ... Water regulation shaft 40 ... Motor part 40 41 ... Motor 42 ... Deceleration gear part 43 ... Output Shaft 44 ... Groove 47 ... Hall IC 49 ... Magnet 61,111 ... Position detection signal 64 ... Motor built-in position 80 ... Bypass side water amount control valve 80 84 ... Water control spring 93 ... Water control sheet 94 ... Water control guide 95 ... Water control Shaft 96 ... Spring pin 99 ... Water adjusting bearing 99 120 ... Drive control circuit 121 ... Motor drive circuit 122 ... Open / close control unit 123 ... Pulse width Control unit

Claims (7)

[Claims] 1. A flow control valve comprising: a flow control valve body for opening and closing a valve for adjusting a flow rate by turning a predetermined adjustment shaft; and a motor unit for turning the adjustment shaft. The output shaft of the motor unit that rotates the adjustment shaft when the body is fully closed has an angle advanced by a predetermined angle in a direction to close the valve body from a predetermined stop angle at which the stop position can be detected. A flow control valve, wherein the motor portion and the flow control valve main body portion are assembled to each other. 2. A method of assembling a flow control valve, comprising: mounting a motor for rotating the adjustment shaft to a flow control valve body that opens and closes by rotating a predetermined adjustment shaft for a valve body for adjusting the flow rate. The output shaft of the motor unit that rotates the adjustment shaft when the valve body is fully closed has advanced a predetermined angle in a direction to close the valve body from a predetermined stop angle capable of detecting the stop position. A flow control valve assembling method, wherein the motor unit is assembled to the flow control valve body so as to form an angle. 3. An adjusting shaft of a flow control valve body which opens and closes by rotating a predetermined adjusting shaft of a valve body for adjusting a flow rate, and an output shaft of a motor unit for rotating the adjusting shaft. A flow control valve assembling method, wherein the motor is assembled to the flow control valve main body by concentrically fitting the motor and the motor. The surface is provided with a plurality of grooves extending substantially parallel to the axis at substantially equal angular intervals, and the other axis has at least one convex tooth on its outer peripheral surface that engages with the groove formed on the inner periphery of the one axis. The valve body of the flow control valve body is fully closed, and the output shaft of the motor is predetermined in a closing direction of the valve from a predetermined stop angle at which the stop position can be detected. The angle is set to the advanced angle and held, and the motor unit is When fitting the output shaft and the adjustment shaft in a state where the output shaft is fitted to a predetermined assembly position for mounting on the body control valve main body, the phase of the convex teeth and the groove does not match, and the output shaft When the adjusting shaft does not fit with the adjusting shaft, the output shaft and the adjusting shaft are fitted by rotating the motor unit in the closing direction of the valve until the phases of the convex teeth and the grooves match. And thereafter rotating the motor in the direction opposite to the closing direction to return to the assembling position and fixing the motor to the fluid control valve body at the position. 4. A flow control valve comprising: a flow control valve body for opening and closing a valve body for adjusting a flow by turning a predetermined adjustment shaft; and a motor unit for turning the adjustment shaft. The output shaft of the motor unit that rotates the adjustment shaft when the valve body is fully closed is an angle advanced by a predetermined angle in the direction to close the valve body from a predetermined stop angle at which the output shaft can detect the stop position. A valve element opening / closing control method for opening and closing a valve element although the motor section and the flow control valve main body section are assembled so that the stop is performed when closing the valve element from an open state to a fully closed state. The output shaft of the motor unit is rotated at a first speed in the closing direction of the valve body until it is detected that the angle has reached the angle, and then the output shaft is rotated at a second speed lower than the first speed. Rotate to gradually close the valve until it is fully closed A valve body opening / closing control method. 5. A reference driving time longer than a maximum time required for the valve body to fully close when the output shaft is rotated at the second speed from the stop angle is determined in advance. The valve body is gradually closed to a fully closed state by uniformly driving the motor unit at the second speed until the reference drive time elapses after the stop angle is reached. The valve opening / closing control method according to claim 4. 6. The valve according to claim 4, wherein the valve body has a function of stopping water with an elastic member, and stops the water by turning the output shaft at the second speed from the stop angle. Valve opening / closing control method. 7. A valve body applied to the flow control valve according to claim 1 or a flow control valve assembled by the flow control valve assembling method according to claim 2 or 3, wherein a change in a rotation angle of an output shaft of the motor section. A valve body characterized in that the shape is set such that the amount and the amount of change in the flow rate in the flow control valve are directly proportional.