JP2016056852A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve device which can prevent the displacement of a valve-opening start angle even if a relative position between a valve opening and a seat opening is displaced to an axial direction.SOLUTION: A valve device changes a communication degree of a valve opening 1b and a seat opening 2b by turning a ball valve 1, is opened by the communication of the valve opening 1b and the seat opening 2b, and closed by the non-communication of the valve opening 1b and the seat opening 2b. A linear part α which is vertical to a turning direction of the ball valve 1 is arranged at a valve-opening start point of the valve opening 1b. By this constitution, even if a relative position between the valve opening 1b and the seat opening 2b is displaced to an axial direction by an assembling error, a dimension allowance or the like, the displacement of a valve-opening start angle can be prevented since a valve opening is started at the linear part α. Therefore, a variation of a flow rate caused by the displacement of the valve-opening start angle, and the reliability of flow rate control with respect to the valve device can be enhanced.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a valve device in which the degree of communication between a valve opening provided in a rotary valve and a seat opening provided in a valve seat is changed by rotating the rotary valve, for example, cooling water (an example of a fluid) The present invention relates to a technique suitable for use in a valve device for a vehicle that controls a motor.

(Conventional technology)
As an example of a valve device in which the degree of communication between the valve opening provided in the rotary valve and the seat opening provided in the valve seat changes by rotating the rotary valve, a technique disclosed in Patent Document 1 is disclosed. Are known.
The technique disclosed in Patent Document 1 uses a rotary valve having a cylindrical shape as a rotary valve. By rotating the rotary valve, a valve opening provided on the outer peripheral surface of the rotary valve and a housing are disclosed. The degree of communication with the seat opening provided in the valve seat on the side changes.

(problem)
Problems of the prior art will be described with reference to FIG. In addition, the code | symbol used below attaches | subjects the same code | symbol to the same function thing as the Example mentioned later.
In a state where the rotary valve is assembled, the design opening position of the valve opening 1b is set to a position indicated by a solid line in FIG.
A solid line A in FIG. 6C shows a flow rate change (flow rate change accompanying a change in the opening degree) when the rotary valve is rotated when the valve opening 1b is opened at a design position.
At this time, a valve opening start angle at which the valve opening 1b and the seat opening 2b are switched from the non-communication state to the communication state is defined as A1.

However, as indicated by the broken line in FIG. 6A, the valve opening 1b may be displaced in the axial direction (the direction in which the rotation center of the rotary valve extends) due to the dimensional tolerance or assembly error of each component. .
A change in flow rate when the rotary valve is rotated in a state where the valve opening 1b is displaced in the axial direction is shown by a broken line B in FIG.
At this time, the valve opening start angle at which the valve opening 1b and the seat opening 2b are switched from the non-communication state to the communication state is defined as B1.

In the prior art, both the valve opening 1b and the seat opening 2b are provided in a circular shape. When the valve opening 1b is displaced in the axial direction, the valve opening start angle B1 is shifted from the designed valve opening start angle A1. End up.
Thus, since the valve opening 1b is displaced in the axial direction, the valve opening start angle is deviated from the operating angle of the rotary valve, so that the flow rate varies with respect to the operating angle, and the operating angle is increased. This causes a problem that the controllability of the flow rate with respect to is deteriorated.

  In the above description, the problem has been described using a rotary valve having a cylindrical shape as a specific example of the rotating valve, but even when a ball valve having an outer peripheral surface having a convex spherical shape is employed, The same problem will occur.

JP 2013-245738 A

  The present invention has been made in view of the above-described problems, and its purpose is that the relative position between the valve opening (1b) and the seat opening (2b) is displaced in the axial direction due to assembly errors, dimensional tolerances, and the like. Even if it exists, it exists in provision of the valve apparatus which can prevent the shift | offset | difference of a valve opening start angle.

In the valve device of the present invention, at least one valve opening start position of the valve opening (1b) or the seat opening (2b) {the position where the valve opening (1b) and the seat opening (2b) are switched from non-communication to a communication state} A straight portion (α) perpendicular to the rotating direction of the rotating valve (1) is provided.
Thereby, even when the relative position of the valve opening (1b) and the seat opening (2b) is shifted in the axial direction due to assembly errors, dimensional tolerances, etc., the valve opening start angle can be made constant. As a result, it is possible to prevent the flow rate variation caused by the deviation of the valve opening start angle, and to improve the reliability of the flow rate control for the valve device.

(Example 1) which is the principal part schematic of a valve apparatus. (A) Explanatory drawing of valve opening and seat opening seen from rotating shaft, (b) Explanatory drawing of valve opening and seat opening in the valve opening start part which compared the presence or absence of position shift (Example 1). (Example 2) which is explanatory drawing of the valve opening and seat opening seen from the rotating shaft. (Example 3) which is explanatory drawing of the valve opening and seat opening seen from the rotating shaft. (Example 4) which is explanatory drawing of the valve opening and seat opening seen from the rotating shaft. (A) Explanatory diagram of positional deviation of the valve opening, (b) Explanatory diagram of the valve opening and seat opening at the valve opening start location comparing the presence or absence of positional deviation, (c) Operating angle and flow rate comparing the presence or absence of positional deviation It is a graph which shows the relationship with (conventional example).

  Hereinafter, “DETAILED DESCRIPTION OF THE INVENTION” will be described in detail.

  A specific example (example) of the present invention will be described with reference to the drawings. The following “Example” discloses a specific example, and it goes without saying that the present invention is not limited to the “Example”.

[Example 1]
A first embodiment will be described with reference to FIGS.
The valve device of this embodiment is mounted on an automobile, and the engine cooling water is operated by pressing the seat surface 2a of the valve seat 2 against the ball surface 1a of the ball valve 1 and rotating the ball valve 1. Flow rate control (opening / closing of the flow path and opening degree adjustment) or distribution control (switching of the flow path) is performed.

  The valve device includes one cooling water inlet (inlet) and one or a plurality of (for example, two or three) cooling water outlets (outlets). Note that when a plurality of cooling water outlets are provided, the basic structure of each cooling water outlet is the same, and in the following description, an opening / closing part leading to one cooling water outlet will be described as an example.

The valve device
(A) a housing 3 provided with a cooling water inlet and a cooling water outlet;
(B) a shaft 4 rotatably supported with respect to the housing 3;
(C) an electric actuator for rotating the shaft 4;
(D) a ball valve 1 that rotates integrally with the shaft 4;
(E) a ring-shaped valve seat 2 pressed against the ball valve 1;
It is configured with.

The housing 3 is provided with an opening for incorporating the ball valve 1 into the housing 3 and a valve chamber for housing the ball valve 1.
The case where the housing 3 is directly assembled to the engine will be described. An opening is provided on the engine mounting surface of the housing 3, and cooling water is supplied to the valve chamber (specifically, inside the ball valve 1) through the opening. Supplied.
On the other hand, when the housing 3 is mounted independently from the engine, the housing 3 is provided with an inlet pipe that guides cooling water that has passed through the engine to the valve chamber.

  In addition, an outlet pipe that guides cooling water adjusted by the valve device to the outside is fixed to the housing 3. Then, the cooling water metered by the valve device is guided to a radiator, a heater core, and the like through a pipe connected to the outlet pipe.

  The shaft 4 is a drive shaft disposed through a substantially central portion of the valve chamber. One end of the shaft 4 is rotatably supported through a ball bearing or the like, and the other end of the shaft 4 is an opening of the valve chamber. It is rotatably supported via a bearing board mounted on the portion (assembly port of the ball valve 1). The bearing board is provided with an opening that allows passage of cooling water.

  The electric actuator employs a well-known configuration. To disclose an example, an electric motor that changes electric power into rotational torque, and a speed reduction mechanism that increases the driving torque of the shaft 4 by reducing the rotational output of the electric motor. (For example, a gear reduction device) and a non-contact type rotation angle sensor that detects the rotation angle of the shaft 4 (that is, the operation angle of the ball valve 1).

  The ball valve 1 is an example of a rotary valve, and the material thereof is not limited. However, when an example is disclosed for assisting understanding, the ball valve 1 is formed of a resin (for example, PPS). The ball valve 1 has a substantially cup shape, and a cup opening for taking cooling water into the ball valve 1 opens toward an opening of the valve chamber (that is, an assembly port of the ball valve 1).

  The ball valve 1 is provided with a valve opening 1b communicating with the outer peripheral surface of the ball valve 1 and the inside of the cup. The outer surface of the ball valve 1 where the valve opening 1b is provided is a smooth ball surface 1a having a convex spherical shape. The “convex spherical shape” is a spherical shape that bulges outward.

The valve seat 2 is a ring body in which a seat opening 2b penetrating in the center is formed. The material of the valve seat 2 is not limited. However, if an example is disclosed for the purpose of assisting understanding, the valve seat 2 is provided by a resin (for example, PTFE). It is done. The valve seat 2 is provided with a smooth seat surface 2 a having a concave spherical shape, and the seat surface 2 a is pressed against the ball surface 1 a of the ball valve 1. The “concave spherical shape” is a spherical shape that is recessed inward.
When the ball valve 1 is turned, the degree of communication between the valve opening 1b and the seat opening 2b changes. The valve opening 1b and the seat opening 2b communicate with each other to open the valve opening 1b. When the seat opening 2b is disconnected, the valve is closed.

The relationship between the curvature of the ball surface 1a and the curvature of the seat surface 2a is not limited. However, if an example is disclosed for the purpose of assisting understanding, in this embodiment, the curvature radius of the ball surface 1a is changed to the curvature radius of the seat surface 2a. Or smaller than the radius of curvature of the seat surface 2a (the curvature of the ball surface 1a ≧ the curvature of the seat surface 2a).
Alternatively, the curvature on the inner side of the seat surface 2a is provided as “the curvature of the ball surface 1a = the curvature of the seat surface 2a”, and the curvature on the outer side of the seat surface 2a is provided as “the curvature of the ball surface 1a> the curvature of the seat surface 2a”. Yes.

The valve seat 2 is supported by the housing 3, and the housing 3 is provided with support means for supporting the valve seat 2.
This support means is
(A) a mounting component 5 fixed to the housing 3;
(B) a spring 6 disposed between the valve seat 2 and the mounting component 5;
(C) a plate 7 disposed between the spring 6 and the mounting component 5;
(D) a sleeve 8 that supports the valve seat 2;
It is configured using.

The mounting component 5 is formed with a fluid flow path on the inner side, and may be, for example, a part of an outlet pipe that guides the cooling water that has passed through the valve seat 2 to the cooling water outlet, and is different from the outlet pipe. It may be a component (such as a cylindrical spacer).
The spring 6 is a compression coil spring, for example, and is assembled in a compressed state.
The plate 7 is a metal spring seat and has a ring disk shape.

The sleeve 8 is a substantially cylindrical body that supports the valve seat 2 at one end side (right end in FIG. 1) and is inserted into the mounting component 5 at the other end side, and guides the cooling water that has passed through the seat opening 2b to the outlet pipe. .
Specifically, the sleeve 8 is provided by a metal material such as stainless steel having excellent body corrosivity (but is not limited), and the valve seat 2 is supported at one end of the cylindrical sleeve 8. As a means, a cylindrical body 8a that restrains the outer peripheral surface of the valve seat 2 and a ring plate 8b that is in pressure contact with the back surface of the seat are integrally provided. In addition, the seat back surface is a surface (left surface in FIG. 1) of the valve seat 2 on the side opposite to the seat surface 2a.
Further, a seal component (lip seal or the like) 9 is disposed between the sleeve 8 and the mounting component 5 to prevent the cooling water from overflowing between the sleeve 8 and the mounting component 5.

  In this embodiment, a straight line portion α perpendicular to the rotational direction of the ball valve 1 is provided at at least one of the valve opening 1b and the seat opening 2b. Note that the “valve opening start location” is a location where the valve opening 1b and the seat opening 2b are switched from a non-communication state to a communication state.

As a specific example, in this embodiment, as shown in FIG. 2A, a linear portion α is provided in the valve opening 1b of the ball valve 1. That is, a straight line portion α perpendicular to the rotation direction is provided at the valve opening start position of the valve opening 1b.
The straight line portion α is in contact with the seat surface 2a when the valve is closed, and is provided so that no gap is formed between the seat surface 2a and the straight portion α when the valve is closed.
Specifically, as shown in FIG. 2A, the straight portion α has a straight shape when viewed from the axial direction of the shaft 4, and the portion in contact with the sheet surface 2a in the straight portion α is It curves along the curvature of the sheet surface 2a.

  An example of the length dimension L of the straight line portion α is provided in a relationship of “± x ≦ L”, where x is the maximum deviation amount in the axial direction of the valve opening 1b with respect to the design position. In other words, even if the ball valve 1 is misaligned in the axial direction due to dimensional tolerance or assembly error, the valve opening is started at the straight portion α.

  Note that the means for providing the linear portion α in the ball valve 1 does not need to use separate parts (not limited). That is, when the valve opening 1b is formed by a cutting technique or a molding technique, the straight part α is also formed at the same time, and the ball valve 1 provided with the straight part α is constituted by one part.

Although the shape of the valve opening 1b excluding the straight line portion α is not limited, an example in which the shape of the valve opening 1b excluding the straight line portion α is circular is shown as a specific example. Of course, the shape of the valve opening 1b excluding the straight portion α is not limited to a circle, and various shapes can be adopted so that the flow rate can be arbitrarily changed according to the operating angle. It may be a long hole shape along the direction.
On the other hand, as a specific example of the shape of the sheet opening 2b, in this embodiment, as shown in FIG.

  In the drawings, an example in which the opening diameter of the valve opening 1b is smaller than the opening diameter of the seat opening 2b is disclosed, but it is an example and is not limited.

(Effect 1 of Example 1)
Next, the effect of the first embodiment will be described with reference to FIG.
In a state where the ball valve 1 is assembled, the design opening position of the valve opening 1b is set to a position indicated by a solid line in FIG.
When the valve opening 1b opens at a design position, the valve opening start angle at which the valve opening 1b and the seat opening 2b are switched from the non-communication state to the communication state is defined as A1.

On the other hand, when the ball valve 1 is assembled, the valve opening 1b may be displaced in the axial direction due to dimensional tolerance or assembly error of each component, as shown by a broken line in FIG. .
As described above, when the valve opening 1b is displaced in the axial direction, the valve opening start angle at which the valve opening 1b and the seat opening 2b are switched from the non-communication state to the communication state is defined as B1.

In the first embodiment, since the straight line portion α is provided in the valve opening 1b, the valve opening 1b and the seat are caused by an assembling error, a dimensional tolerance, and the like, as is clear by comparing the solid line and the broken line in FIG. Even when the relative position of the opening 2b is shifted in the axial direction, the valve opening start angle B1 can be made the same as the valve opening start angle A1 without deviation by the straight line portion α (A1 = B1).
As described above, even when the ball valve 1 is displaced in the axial direction due to an assembly error or the like and the valve opening 1b is displaced in the axial direction with respect to the seat opening 2b, the valve opening start angle is displaced. Can be prevented. As a result, it is possible to prevent variations in the flow rate caused by the deviation of the valve opening start angle, and it is possible to improve the reliability of the flow rate control for the valve device.

[Example 2]
A second embodiment will be described with reference to FIG. In the following embodiments, the same reference numerals as those in the first embodiment indicate the same functions.
In the said Example 1, the example which provides the linear part (alpha) in the valve opening 1b was shown.
On the other hand, in the second embodiment, the linear portion α is provided in the sheet opening 2b. That is, a straight line portion α perpendicular to the rotation direction is provided at the valve opening start position of the seat opening 2b. The linear portion α is in contact with the ball surface 1a when the valve is closed, and is provided so that no gap is formed between the ball surface 1a and the linear portion α when the valve is closed.
Even if it provides in this way, the same effect as Example 1 can be acquired.

[Example 3]
Embodiment 3 will be described with reference to FIG.
The third embodiment shows a specific example in the case where a plurality of cooling water outlets are provided in the valve device.
In this case, as shown in FIG. 4, one ball valve 1 is provided with a plurality (two in the drawing) of valve openings 1b.
On the other hand, the housing 3 is provided with a plurality (two in the drawing) of valve seats 2 respectively leading to a plurality of cooling water outlets.
Then, by rotating the ball valve 1, the degree of communication between each valve opening 1b and the seat opening 2b provided in each valve seat 2 is adjusted, and the flow rate of the cooling water toward each cooling water outlet Adjustments are made.

In the third embodiment, a linear portion α is provided at the valve opening start location of the plurality of valve openings 1b.
By providing in this way, even when the positional deviation in the axial direction occurs in the ball valve 1 due to an assembly error or the like, it is possible to prevent the deviation of the respective valve opening start angles. The reliability of the flow rate control of the cooling water to go can be improved.

[Example 4]
Embodiment 4 will be described with reference to FIG.
The fourth embodiment shows an example in which a plurality of cooling water outlets are provided in the valve device as in the third embodiment.
And in this Example 4, the linear part (alpha) is provided in the valve opening start location of the some sheet | seat opening 2b.
Even if it provides in this way, the same effect as Example 3 can be acquired.

  In the above embodiment, the ball valve 1 is used as an example of the rotary valve. However, the present invention is not limited thereto, and the present invention may be applied to, for example, a rotary valve whose outer peripheral surface has a cylindrical shape.

  In the above embodiment, an example is shown in which the fluid (cooling water in the embodiment) flows from the inside to the outside of the rotating valve (in the embodiment, the ball valve 1) when the valve is opened. good.

  In the above-described embodiment, an example in which the ball valve 1 is rotated by the electric actuator has been described. However, the driving means of the ball valve 1 is not limited.

  In the above-described embodiment, an example in which press-fitting is used as a technique for fixing the sleeve 8 and the valve seat 2 is shown. However, the coupling means is not limited and, for example, an adhesive may be used.

  In the above embodiment, a compression coil spring is used as an example of the spring 6, but the compression means for the ball valve 1 and the valve seat 2 is not limited. When a specific example is disclosed, various applications such as using a bellows having a spring function or using a rubber member are possible.

  In the above-described embodiment, an example in which the present invention is applied to a valve device that controls engine cooling water has been shown. However, the present invention may be applied to a valve device that controls cooling water in a vehicle not equipped with an engine. .

  In the above embodiment, an example in which the present invention is applied to a valve device that controls liquid (cooling water as a specific example) has been shown. However, the fluid is not limited to liquid, and gas (gas) The present invention may be applied to a valve device that performs the above control.

1 Ball valve (rotating valve)
1b Valve opening 2 Valve seat 2b Seat opening 3 Housing 4 Shaft α Linear part

Claims (3)

A rotation valve (1) that is rotated, and a valve seat (2) provided in a housing (3) that accommodates the rotation valve (1);
By turning the turning valve (1),
A valve opening (1b) provided on the outer peripheral surface of the rotating valve (1);
A seat opening (2b) provided in the valve seat (2);
In the valve device where the degree of communication of
When the valve opening (1b) and the seat opening (2b) are the points where the valve opening start point is switched from a non-communication state to a communication state,
At least one valve opening start location of the valve opening (1b) or the seat opening (2b) is provided with a linear portion (α) perpendicular to the rotating direction of the rotating valve (1). A characteristic valve device. The valve device according to claim 1,
The rotating valve (1) is a ball valve (1) provided with a convex spherical ball surface (1a) on an outer peripheral surface;
The valve opening (1b) opens to the ball surface (1a). The valve device according to claim 2,
In the valve seat (2), the seat surface (2a) slidably contacting the ball surface (1a) has a concave spherical shape.

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