JPH0313461B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an electromagnetic flow control valve that controls the flow rate of fluid from an inlet port to an outlet port by controlling the opening amount of a valve hole by displacing a valve body using a rotationally displacing valve part. Regarding.

As a prior art related to the present invention, there is one disclosed, for example, in Japanese Utility Model Application Publication No. 52-97626. This prior art will be explained based on FIG.
5 is provided to control the amount of fluid communication between the input port 102 and the output port 103 according to the amount of engagement between the valve hole 105 and the valve body 104.

Here, the valve body 104 performs linear reciprocating motion, and its driving source is as shown below.
That is, rotational motion is extracted from the DC motor 106 via a shaft 107, and a plurality of weights 109 are disposed at the tips of a plurality of arm portions 108 extending from the shaft 107, with the tips serving as fulcrums 116.

The shaft 11 is located at the lower end of the shaft 107 in the drawing.
0 is engaged, but the rotational movement of shaft 107 is not transmitted to shaft 110. Shaft 1
A flange 111 is formed above 10 in the drawing,
The tip of the arm portion 112 of the weight 109 is engaged with the lower surface of the flange 111 in the drawing. Further, a valve body 104 is fixedly provided at the lower end of the shaft 110 in the drawing. Further, a flange 113 is formed approximately at the center of the shaft 110, and the flange 113 and the body 1
A spring 115 is disposed between the spring 14 and the spring 14.

In the above, by applying a variable voltage to the DC motor 106, the rotation speed of the shaft 107 is changed. At this time, the lower the rotation speed, the more weight 10
The position 9 is close to that shown in FIG. 4, and as the rotational speed increases, the weight 109 rotates about the fulcrum 116 in a direction in which the tip of the arm 112 moves upward in the figure.

According to the rotation of this weight 109, the flange 111
is lifted upward in the figure, so shaft 1
10 moves upward in the figure against the biasing force of the spring 115, and the amount of engagement between the valve hole 105 and the valve body 104, that is, the amount of opening of the valve hole 105 changes.

As described above, in this prior art, the amount of rotation of the weight 109 changes in accordance with the change in the rotational speed of the DC motor 106, and the amount of movement of the shaft 110, that is, the opening amount of the valve hole 105 changes in proportion to the change in the rotation speed of the DC motor 106. Yes, therefore input port 102 and output port 10
The amount of fluid communication with 3 changes.

However, with this type of control valve,
The mechanism that converts the rotary motion of a motor into linear motion of the shaft takes up space, so it is suitable for applications where there is relatively sufficient installation space, such as control valves for large machines, but it is not suitable for applications such as control valves for automobile engines, for example. When used in the limited space under the bonnet of an automobile, interference with other engine accessories and the like has been a problem.

Therefore, in the present invention, in a control valve that performs variable control of fluid flow rate using variable rotational motion,
The purpose was to make the main body smaller, and since sliding resistance between the valve body and the valve hole tends to be a problem, the purpose was to control the opening amount of the valve hole without using linear movement of the valve body. do.

For these purposes, in the present invention, a conical rotor that divides the inside of the body into an inlet port side and an outlet port side is rotatably held in the body via a bearing, and the rotor is mounted on the conical surface of the rotor. A leaf spring is fixed to the plate spring which has a biasing force in the direction of closing the valve hole of the rotor and integrally has a valve body that closes the valve hole, and the rotor is moved in response to the current applied to the electromagnetic coil. The gist of the configuration is that it is connected via a rotating shaft to a DC motor whose rotational speed is controlled.

Therefore, according to the configuration of the present invention, the centrifugal force that resists the biasing force of the leaf spring in the closing direction of the valve hole is reduced in accordance with the rotational speed of the DC motor that is controlled by the current applied to the electromagnetic coil. Since it can act on the valve body, the valve body moves in the opening direction, making it possible to control the fluid flow rate from the inlet port to the outlet port according to the rotation speed.
Since the valve part constantly rotates and the opening amount of the valve body is given only by that rotation, there is no need for a mechanism to convert rotational motion into linear motion as in the past, and since there is no need for space to accommodate this mechanism, the control valve body miniaturization is achieved.

In addition, the valve body does not slide with the valve hole, but comes into contact or non-contact with the valve hole due to centrifugal force, so there is no sliding resistance between the valve body and the valve hole as in the conventional case, and the valve hole is caused by sliding resistance. This eliminates problems such as opening delays.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

The DC motor rotational speed responsive flow control valve 10 shown in FIG. A cover 15 is attached to the sealing member 1 at the opening.
6 and is airtightly fixed. body 14
A conical rotor 17 is held inside the body 14 and the outlet port 13 via bearings 21 and 22, and the rotor 17 partitions the inlet port 11 side and the outlet port 13 side. The rotor 17 is provided with a plurality of valve holes 18, as shown in FIG. 2, and a valve seat 18a at the open end thereof is flat. Also rotor 17
The plate spring 1 has a biasing force in the direction of closing the valve hole 18 of the rotor 17 and has a valve body 23 integrally.
9 is fixed so as to close the valve hole 18.
Furthermore, a rotating shaft 2 is located at the center of the axis of the rotor 17.
One end of 0 is fixed. These form a flow control valve section Va. A DC motor Vb is connected to the other end of the rotating shaft 20.

The operation of the present invention configured as above will be explained next.

When no current is applied to the electromagnetic coil,
Since the DC motor does not rotate, the valve element 23 is biased by the leaf spring 19 fixed to the rotor 17 and comes into contact with the valve seat 18a, closing the valve hole 18.
There is no fluid flow to 3. On the other hand, when a current is applied to the electromagnetic coil, the rotor 17 also rotates in accordance with the rotation of the DC motor, which is controlled by the current value. As a result, a centrifugal force can be applied to the valve body 23 that resists the urging force of the leaf spring 19 in the closing direction of the valve hole 18, and the valve body 23 can be
Since the fluid moves in the opening direction, the flow rate of fluid from the inlet port 11 to the outlet port 13 is controlled according to the rotational speed.

As shown in FIG. 3, if the valve hole 18 of the rotor 17 is formed into a spiral ventilation path, the resistance to ventilation of the fluid against the rotation of the rotor can be reduced, which is useful for controlling the flow rate.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a DC motor rotation speed responsive flow control valve according to the present invention, Fig. 2 is an explanatory diagram of a valve portion of the flow control valve according to the present invention, and Fig. 3 is a preferred shape of the valve hole of the valve portion. An explanatory diagram is shown. Figure 4 shows
1 shows a cross-sectional view of a prior art control valve; FIG. 11: Inlet port, 13: Outlet port, 14: Body, 17: Rotor, 18:
Valve hole, 19: Leaf spring, 20: Rotating shaft, 2
1: bearing, 22: bearing, 23: valve body, Va: flow control section, Vb: DC motor section.

Claims (1)

[Claims] 1. A body having a passage communicating between an inlet port and an outlet port, and a conical rotor rotatably held in the body via a bearing and dividing the inside of the body into an inlet port side and an outlet port side. , a plate spring fixed to the conical surface of the rotor, a valve body provided integrally with the plate spring that closes the valve hole by the biasing force of the plate spring, and a rotating shaft fixed on the axial center of the rotor. and a DC motor unit connected to the rotating shaft, the valve body being displaced by the action of centrifugal force that resists the biasing force of the leaf spring in response to the rotation of the DC motor. , a rotation speed responsive flow control valve that communicates the inlet port and outlet port.