JPH0540678U - Flow control valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a flow control valve capable of performing a stable operation by tightly fitting a valve body to a valve seat and reducing an adhesive force between them. A control having an actuator 10 having an output shaft 25 that moves linearly, and a valve body 40 that is driven by the actuator 10 to move in the axial direction and that can open and close a valve seat 36 provided in a passage 34 that penetrates the actuator. Valve 30
The valve seat 36 includes a ring-shaped tongue piece portion 47 having a spring elasticity that annularly projects in the axial direction.
And the valve body 40 includes an annular tongue piece 4 of the valve seat 36.
7, a tubular portion 41 having an outer peripheral wall parallel to the axis of the tubular portion 41, the annular tongue portion 47 being the tubular portion 4.
It is characterized in that the flow path 34 can be closed by being tightly fitted into the flow path 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flow control valve configured to adjust the opening degree by an actuator.

[0002]

[Prior Art]

 For example, in an engine equipped with an electronically controlled fuel injection device, in order to control the number of revolutions during idling, a bypass passage bypassing the throttle valve is provided in the intake passage, and a motor for controlling the flow rate of air flowing through the bypass passage is provided. Driven flow control valves are widely used.

FIG. 7 shows an example of a flow control valve used for such idle speed control. In this flow rate control valve, a step motor 70 is used as an actuator, and the output shaft 72 is configured to reciprocate in the axial direction by rotating the rotor 71 in the forward and reverse directions.

The tip of the output shaft 72 is located in the flow path 74 of the bypass air, and the valve body has a valve pressing portion 78 a that projects like a flange and has a tapered surface on the shaft. 78 is provided.

Further, the flow path 74 is provided with a valve seat 76 having a closing surface 76a made of a concave taper surface so that the valve pressing portion 78a and the closing surface 76a are in surface contact with each other to close the valve. Is formed in. By the linear movement of the valve body 78, the annular area A (see FIG. 8) communicating with the flow path 74 is increased or decreased, whereby the supply amount of the bypass air is controlled.

[0006]

[Problems to be solved by the device]

 However, in such a conventional flow rate control valve, when the valve seat 76 is formed of a metal member, if the contact surface between the valve pressing portion 78a and the closing surface 76a has one side contact, There is a problem that the rotary motion-linear motion conversion mechanism 73 provided between the rotor 71 of the step motor 70 and the output shaft 72 is worn quickly, and the drive control performance of the step motor 70 is degraded.

Further, when the valve seat 76 is formed of a synthetic resin member (for example, refer to the control valve disclosed in Japanese Utility Model Laid-Open No. 55-117669), the valve pressing portion 78a is closed when the valve is closed. There is a possibility that they bite into 76a and both adhere to each other to cause malfunction of the flow control valve.

Therefore, in order to avoid the above problems, a small gap G is generally provided between the valve pressing portion 78a and the closing surface 76 when the control valve is closed as shown in FIG. .. Therefore, even when the valve is closed, there is a problem that the amount of air leaks and the flow control range of the flow control valve is narrowed.

The present invention has been made in view of the above problems, and an object thereof is to tightly fit a valve body on a valve seat and reduce an adhesive force between them to perform a stable operation. The present invention aims to provide a flow control valve that can be used.

[0010]

[Means for solving the problem]

 The present invention has been made in order to achieve the above-mentioned object, and it opens and closes an actuator having an output shaft that moves linearly, and a valve seat that is driven by the actuator to move in the axial direction and that is provided in a flow passage that penetrates it. A control valve having a movable valve body, the valve seat having an annular tongue portion having a spring elasticity that annularly protrudes in the axial direction, and the valve body is the valve body. The seat includes a tubular portion that can be tightly fitted to the annular tongue portion and has an outer peripheral wall that is parallel to the axis of the seat, and the annular tongue portion can be tightly fitted to the tubular portion to close the flow path. It is a flow control valve characterized by being configured.

[0011]

[Action]

 The present invention is configured as described above, and in the valve body of the control valve, when the valve is closed, the tubular portion thereof fits into the annular tongue portion of the valve seat and the annular tongue portion is The flow path is closed by being tightly fitted in the tubular portion.

Further, when the valve is closed, the tubular portion and the annular tongue portion are in a state of substantially linear contact, and the adhesive force between the valve body and the valve seat that move in the axial direction is reduced.

[0013]

【Example】

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

In the figure, reference numeral 1 is a flow control valve. The flow control valve 1 includes a step motor 10 as an actuator, a valve seat 36 having an annular tongue portion 37, and a valve body 40 having a tubular portion 41. And a control valve 30.

The step motor 10 includes a stator 13 provided in a motor housing 11, a rotor 16 rotatably provided, and an output shaft 25 that linearly moves. Then, one end of the motor housing 11 is covered with the flange portion 12.

The stator 13 is composed of a coil 14 and a magnetic pole 15 which are wound in an annular shape. The rotor 16 is formed of a permanent magnet 17 magnetized in the circumferential direction and a shaft propelling screw 19 in which a female screw is threaded on the inner peripheral side. The shaft propelling screw 19 of the rotor 16 is rotatably supported by ball bearings 21 and 22. The ball bearing 21 is provided on the motor housing 11, and the ball bearing 22 is supported by a slide bearing 23 provided on the flange portion 12.

A screw is threaded on the outer circumference of one end of the output shaft 25, and this male screw is paired with the shaft propelling screw 19. Further, the output shaft 25 is formed with a substantially semicircular cross-section portion, and the portion is inserted into a semicircular through hole provided in the slide bearing 23 so as to prevent the rotation of the output shaft 25. Has been done. The output shaft 25 penetrates the flange portion 12 and projects outward, and is configured to move linearly in the axial direction by the forward and reverse rotations of the rotor 16 so that the projecting length can be varied.

The motor housing 11 is fixed to one end of the valve housing 31 of the control valve 30 by a mounting screw 28 so that the tip end of the output shaft 25 projects into the flow path 34 of the valve housing 31. The motor 10 and the control valve 30 are integrally connected.

The control valve 30 is provided in the valve housing 31, and has a flow passage 34 having an inlet port 32 at one end and an outlet port 33 at the other end, a valve seat 36 provided in the flow passage 34, and an output shaft 25. A valve body 40 that is fixed to the tip portion and that can be tightly fitted to the valve seat 36 is mainly configured.

In the valve seat 36, in the embodiment, an annular tongue piece portion 37 annularly protruding in the axial direction is fixed to one end portion of the inner peripheral wall by a metal member. The annular tongue portion 37 is made of a rubber-like elastic material (for example, NBR) having excellent heat resistance and oil resistance, and has an annular cross section formed in a fin shape inclined toward the outlet port 33. The annular tongue portion 37 may be fixed by adhesion, baking, or another fixing method.

The valve body 40 includes a tubular portion 41 having an outer peripheral wall parallel to the axis thereof, and an annular projection 42 projecting in the semi-radial direction on the base end side thereof. It is formed in a taper shape toward. The diameter of the tubular portion 41 is slightly larger than the inner diameter of the annular tongue portion 36. A female screw portion 43 is provided at the center of the valve body 40, and this is screwed into the male screw portion of the tip of the output shaft 25 to integrally fix the valve body 40 to the output shaft 25.

As shown in FIG. 3, the fixed position of the valve body 40 is such that when the output shaft 25 of the step motor 10 is made to project to the valve closed position, the tubular portion 41 of the valve body 40 has the valve seat 36. The ring-shaped tongue piece 37 enters into the close-fitting state, and the ring-shaped protrusion 42 is set at a position where a predetermined clearance is maintained between the valve seat 36 and the ring-shaped tongue piece 37. Reference numeral 44 is a spring that is interposed between the flange portion 12 and the valve body 40 and prevents rattling when the output shaft 25 operates.

In the flow rate control valve configured as described above, for example, the inlet port 32 of the control valve 30 is connected to an intake pipe on the upstream side of the throttle valve (not shown), and the output port 33 is connected to the downstream side of the throttle valve. It Further, the step motor 10 is connected to an idle speed control device (not shown).

When a drive signal is input to the step motor 10 from the control device, the rotor 16 rotates forward and backward in response to the signal. As a result, the output shaft 25 linearly moves in the axial direction, moves the valve body 40 in the left-right direction in FIG. 1, and increases or decreases the amount of bypass air supplied through the flow path 34.

When the protruding length of the output shaft 25 is maximized, the outer circumference of the tubular portion 41 of the valve body 40 is tightly fitted to the tip of the annular tongue portion 37 of the valve seat 35, and the annular tongue portion 37 Becomes a seal and closes the flow path 34.

In this valve-closed state, the tubular portion 41 and the annular tongue portion 37 are substantially in line contact with each other, and the adhesive force between the tubular portion 41 and the annular tongue portion 37 that move in the axial direction is As a result, the valve body 40 is in a stable operable state without being obstructed in its movement.

Further, in the valve closed state, the annular projection 42 of the valve body 40 is not in contact with the valve seat 36 and the annular tongue piece 37, and the one-side contact due to the axial contact between the two , Avoiding bites.

4 to 6 show other embodiments of the valve seat, and as shown in FIG. 4, the annular tongue portion 47 made of a rubber-like elastic material is a tubular base material 48 made of a metal member. The valve seat 46 may be formed so as to be in contact with the inner peripheral wall and both end surfaces.

Further, like a valve seat 56 shown in FIG. 5, an annular tongue portion 57 made of a rubber-like elastic material may be provided so as to cover the entire surface of the cylindrical cored bar 58.

Further, the annular tongue portion 57 may be solid.

Further, as shown in FIG. 6, an enlarged diameter portion 66a may be provided on the inner peripheral wall of the valve seat 66, and the annular tongue portion 67 may be formed so as to project from the step portion.

[0032]

[Effect of the device]

 As described above, the flow control valve of the present invention is capable of opening and closing an actuator having an output shaft that makes a linear movement, and a valve seat that is driven by the actuator to move in the axial direction and that is provided in a penetrating passage. A control valve having a valve body, wherein the valve seat includes an annular tongue portion having spring elasticity that annularly protrudes in the axial direction, and the valve body is Since the annular tongue portion is provided with a tubular portion having an outer peripheral wall parallel to the axis thereof, the annular tongue portion is tightly fitted to the tubular portion and can block the flow path. When the valve is closed, the valve body can enter the valve seat and tightly fit to close the flow path.

Therefore, it is possible to avoid contact between the valve body and the valve seat in the axial direction, prevent one-sided contact and bite due to the contact, and prevent air leakage when the valve is closed.

Further, when the valve is closed, the valve body and the valve seat are in a state of substantially linear contact, and there is an effect that the adhesion force between the two can be reduced and stable operation can be performed.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing a valve seat and a valve body which are also in a valve open state.

FIG. 3 is a sectional view showing a valve seat and a valve body when the valve is closed.

FIG. 4 is a sectional view showing another embodiment of the valve seat.

FIG. 5 is a sectional view showing another embodiment of the valve seat.

FIG. 6 is a sectional view showing another embodiment of the valve seat.

FIG. 7 is a vertical sectional view of a conventional flow control valve.

FIG. 8 is a sectional view showing the valve seat and the valve body in the same valve opened state.

FIG. 9 is a sectional view showing a valve seat and a valve body when the valve is closed.

[Explanation of symbols]

 1 Flow Control Valve 10 Step Motor (Actuator) 25 Output Shaft 30 Control Valve 34 Flow Path 36, 46, 56, 66 Valve Seat 37, 47, 57, 67 Annular Tongue Portion 40 Valve Body 41 Cylindrical Portion

Claims (1)

[Scope of utility model registration request] 1. An actuator having an output shaft that moves linearly, and a control valve that is driven by the actuator to move in the axial direction and that has a valve body that can open and close a valve seat provided in a passage that penetrates the control valve. A flow control valve provided, wherein the valve seat includes an annular tongue portion that has a spring elasticity and annularly protrudes in an axial direction, and the valve body can be tightly fitted to the annular tongue portion of the valve seat. And a tubular portion having an outer peripheral wall parallel to the axis thereof, wherein the annular tongue portion is tightly fitted to the tubular portion so as to be able to close the flow path. valve.