JPH1194100A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve device capable of reducing torque to be generated in the rotation of a valve element, capable of preventing the positional deviation to be generated in the attachment of a seal member, and capable of easily performing control of a plurality of flows. SOLUTION: A valve element 5 is rotatably housed in a main body 1 provided with an inflow port 3 and an outflow port 4 for fluid, a recessed part 11 is formed on a part on the same circumference as a flow port 10 of the valve element so as to be larger than the outflow port 4 of the main body 1, a sheet- like seal member 12 is inserted into the recessed part 11, and a pressure guide passage 9 for communicating the recessed part 11 and the inside of the valve element 5 with each other is so provided that internal pressure may be introduced to the back surface of the seal member 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device applied to various valves such as a switching valve and a mixing valve.

[0002]

2. Description of the Related Art Among valves installed in a piping system of a fluid such as water or air, a cylindrical or conical valve element is rotatably arranged in a flow path, and provided on the valve element. A plug valve having a through hole as a flow path is widely used. This plug valve is also applied to, for example, a hot and cold water mixing valve, a switching valve, and the like, and one of its structural features is that the valve element rotates and switches the flow path according to the rotation angle. In such a structure that rotates a valve body such as a cylinder, it is necessary to arrange packing for sealing so as to be in close contact with the peripheral surface of the valve body. The packing is commonly used O
Rings and gaskets are mainly used, and many of them are annular to seal the circumferential surface of the valve element.

[0003]

Since the conventional valve structure is configured as described above, there are the following problems. That is, the seal pressure by the packing acts on the valve body, and when rotating the valve body, this seal pressure becomes a frictional resistance, and in addition to requiring a large starting torque at the time of rotation,
A large torque is also required during rotation. For example, when assuming automatic driving performed by controlling a motor or the like, it is necessary to increase the capacity of the motor.
This has been a major problem such as an increase in the size of the apparatus and an increase in cost.

[0004] As a means for solving such a problem,
For example, Japanese Patent Application Laid-Open No. 1-1199069 discloses a method in which a sheet material of a fluorine-containing resin is provided on one of an outer wall surface and an inner wall surface of a valve body in order to smoothly rotate the valve body. However, this method also requires packing to secure the sealing pressure of the sheet material, and the sealing pressure of the packing must be set high to ensure the sealing performance of high-pressure fluid, etc. There was a problem such as inviting. Also, when assembling the packing and the sheet material together on the valve body side, the order in which the packing is first attached and then the sheet material is assembled thereon, so that the packing may be misaligned after the assembly of the sheet material. In addition, there has been a problem that the displacement is difficult to understand at the assembly stage. Also, in order to control a large number of flows, a plurality of commonly used three-way valves or the like will be used.However, if the present invention is applied to a device that controls a plurality of flows at once in one product, the same applies. The use of a plurality of three-way valves necessitates the control of each, increasing the cost and complicating the control, and using a conventional seal structure for controlling a plurality of flows complicates the valve structure. In addition, there was a problem that the torque during rotation became extremely large.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems associated with the sealing structure of a valve body, and can reduce torque during rotation of the valve body and can reduce positional displacement when a sealing member is attached. An object of the present invention is to provide a valve device having an inexpensive structure that can prevent the flow and can easily control a plurality of flows.

[0006]

The valve device according to the present invention comprises:
A body having a fluid inlet and a fluid outlet, and a hollow cylindrical valve body rotatably housed in the body and provided with a flow path port on a peripheral wall, wherein the valve body is rotated by the rotational position of the valve body. In a valve device for opening and closing a flow passage by aligning or mismatching a flow passage opening with an outlet of the main body, a concave portion formed on the peripheral wall of the valve body to be larger than the outlet, and inserted into the concave portion. And a pressure guiding path communicating the recess with the inside of the valve so as to introduce internal pressure to the back surface of the sealing member.

According to this structure, when closing the outlet of the main body, the pressure of the fluid supplied from the inlet acts on the seal member in the concave portion from the pressure guide path, and the seal member is pressed against the outlet. Block the outlet. Therefore, the flow of the fluid is stopped. Also, when rotating the valve body to open the outlet, since the valve body is rotated with the internal pressure reduced, the contact pressure between the seal member and the inner surface of the main body is reduced, so that the frictional resistance is reduced and the valve is rotated. The torque during the rotation of the body can be reduced.

In the present invention, the concave portion is formed in a plurality of stages, and the pressure guiding passage is provided so as to communicate the outer concave portion closest to the inner surface of the main body with the inside of the valve body. When the internal pressure is small or unstable, a single sealing member may not be able to secure the required sealing pressure.In such a case, a plurality of recesses are provided, and the sealing is performed by the elastic pressure of the inner sealing member. Make up the pressure and ensure the required sealing pressure. A pressure guide path is provided so that the internal pressure acts on the outer seal member closest to the inner surface of the main body.

In the present invention, the recess is formed in a plurality of steps, and at least one side or a tangent of the recess in each step is common. In the case where the concave portion is formed in a plurality of stages, if the inner seal member is not properly fitted, when the outer seal member is attached, the end of one common side rises from the outer peripheral surface of the valve body. In addition, it is possible to visually confirm the improper installation and displacement of the seal member.
Therefore, it is possible to prevent the seal member from being attached improperly or from being displaced in the assembling stage. When the sealing member and the concave portion are circular, it is only necessary that the tangent line in each step is common.

In the present invention, of the seal members inserted into the plurality of recesses, the seal member inserted into the outer recess is made of a lubricating member, and the seal inserted into the inner recess. The member is formed of an elastic member, and the elastic member is formed so as to be smaller than the lubricating member and larger than the outlet of the main body. The outer sealing member that comes into contact with the inner surface of the body is made of a lubricating member such as a fluororesin, for example, to reduce frictional resistance. The inner seal member is made of an elastic member such as silicon rubber, for example, and assists the seal pressure when the internal pressure is small or unstable.

In the present invention, a plurality of inlets and a plurality of outlets are provided on a peripheral wall of the main body, the inside of the valve body is divided into a plurality of chambers, and the seal is provided on a peripheral wall of one of the chambers. The concave part for inserting a member and the pressure guiding path for introducing the internal pressure are provided. According to this configuration, the plurality of flow paths can be switched by only one valve device rotating operation with one valve device. In addition, since the above-described seal structure is employed, the operating torque of the valve body is small.

In the present invention, at least one of the chambers other than the internal pressure introduction chamber provided in the valve body is formed in a groove shape.
The chamber and the inlet and outlet of the main body constitute a concave flow path. This configuration allows the opening and closing and switching of one or more concave channels flowing from the inlet to the outlet of the body. The flow path configuration in the valve body is also simplified, and the size of the valve device can be reduced.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a cross-sectional view of a valve device according to Embodiment 1 of the present invention, and illustrates a water on-off valve device here. FIG. 2 is an enlarged view of a main part of FIG. The main body 1 is formed, for example, in a substantially cylindrical shape as a whole, has a valve body storage chamber 2 having a circular cross section therein, and an inflow port 3 communicating with the valve body storage chamber 2.
Is provided at one end. The fluid outlet 4 is provided on the peripheral wall or side wall of the main body 1. The valve body 5 formed in a hollow cylindrical shape has a hollow chamber 6 inside, and an open end 7 at the tip thereof.
Is coaxially fitted into the valve body storage chamber 2 toward the inflow port 3. The clearance between the outer peripheral surface of the valve body 5 and the inner peripheral surface of the main body 1 is formed as small as possible. Further, the rear end side of the hollow chamber 6 inside the valve element 5 is closed by an end plate 8, and the peripheral wall is formed on the circumference so as to coincide with the outflow port 4 when the valve element 5 is rotated. Two holes 9, 10 are provided.
The smaller diameter hole 9 forms a pressure guiding path, and the larger diameter hole 10 forms a flow path port. The passage opening 10 and the outlet 4 have substantially the same diameter. Further, a recess 11 larger than the outlet 4 is provided on the outer circumference of the valve element 5 on the same circumference as the flow port 10, and the pressure guiding passage 9 communicates with the bottom surface of the recess 11. A sheet-shaped sealing member 12 is fitted into the recess 11. The seal member 12 is formed of an elastic member such as a rubber plate. Recess 11 and seal member 1
The shape of 2 is usually a circle, a square, or the like. The central angle formed by the flow path port 10 and the concave portion 11, that is, the rotation angle of the valve element 5 is not particularly limited.

The main body 1 has a flange portion 13 at the other end, and is closed by attaching a hollow lid 14 to the flange portion 13 with a fixing means such as a normal bolt. A rotary shaft 15 is connected concentrically to the end plate 8 of the valve body 5,
The rotary shaft 15 is drawn out to the outside through the center hole 16 of the motor 17 and the rotary shaft 15 is connected to a drive shaft (not shown) of the motor 17. The gap between the lid 14 and the main body 1 and the gap between the center hole 16 of the lid 14 and the rotating shaft 15 are O-rings 1 respectively.
Sealed by 8 and 19.

A pipe (not shown) is connected to the inflow port 3 and the outflow port 4 of the main body 1, respectively. When the valve body 5 is at the rotational position shown in FIG. When the fluid is supplied to the inflow port 3 by a pump (not shown) when the fluid is in a position aligned with the outflow port 4, the fluid fills the valve body storage chamber 2 in the main body 1 and the hollow chamber 6 in the valve body 5. An internal pressure P is generated. The internal pressure P also acts on the seal member 12 in the concave portion 11 formed on the peripheral wall of the valve body 5 through the pressure guiding path 9 as shown in FIG. Thus, since the seal member 12 is uniformly pressed against the periphery of the outlet 4, the fluid can be prevented from being discharged from the outlet 4, and the flow can be stopped.

Next, when a control signal is sent to the motor 17 to rotate the valve body 5 around the center line 20 by, for example, 180 °, the flow path opening 10 opened in the peripheral wall of the valve body 5 aligns with the outflow port 4, and The fluid that has entered through the inlet 3 is discharged through the outlet 4. By these series of operations, the function of the on-off valve for water is exhibited. When the valve element 5 is rotated, the pump is stopped and then rotated, so that the internal pressure acting on the seal member 12 decreases, and the contact pressure between the seal member 12 and the inner surface of the main body 1 decreases. Therefore, the torque at the time of rotation of the valve element 5 can be reduced.

According to the valve device of the present embodiment configured and operated as described above, when the valve element 5 rotates, the sealing pressure of the sealing member 12 made of an elastic body is unnecessary or minimized. Therefore, the frictional resistance due to the sealing pressure when rotating the valve element 5, the starting torque at the time of rotation, and the torque at the time of rotation can be minimized. This is, for example, assuming automatic driving with a motor etc.,
This solves the above-mentioned problem.

Embodiment 2 FIG. Next, a second embodiment of the present invention will be described with reference to FIG. The valve device of the present embodiment is configured such that the concave portion is formed in a plurality of stages, and the outer concave portion 21 closest to the inner surface of the main body 1 and the inside of the valve element 5 communicate with each other through the pressure guiding path 9. . Here, two-stage recesses 11 and 21 are shown, and a seal 11 made of an elastic body is provided in the smaller inside recess (however, larger than the outlet 4 of the main body 1) as in the first embodiment. The member 12 is inserted, and a sealing member 22 made of a lubricating member such as a fluororesin is inserted into the outer larger concave portion 21. Other configurations are the same as those of the first embodiment.

In the configuration of the first embodiment, since one sealing member 12 is used, a desired sealing pressure cannot be secured when the supply pressure from the inflow port 3 is small or unstable. There is. Therefore, when the configuration as in the present embodiment is adopted, the sealing member 12 made of an inner elastic body is used.
As a result, the pressure Q acts on the outer seal member 22 and the inner pressure P of the valve body 5 acts on the outer seal member 22 from the back side. The pressure shortage can be compensated. Therefore, a necessary sealing pressure can be secured stably. Further, since the outer seal member 22 is made of a lubricating member, the frictional resistance during rotation of the valve element 5 is reduced, and the torque during rotation can be reduced. When the internal pressure P is higher than the elastic pressure Q from the seal member 12, the outer seal member 22 may separate from the inner seal member 12, but in this case, the operation is the same as in the first embodiment.

As described above, even if the elastic pressure Q of the inner seal member 12 is applied, the rotation of the valve element 5 is prevented due to the effect of the outer seal member 22 being formed of a good lubricating member. In this case, the torque can be reduced. Moreover, even when the supply pressure from the inflow port 3 is small or unstable, a required sealing pressure can be secured by the elastic pressure Q of the inner sealing member 12.

Embodiment 3 Next, a third embodiment of the present invention will be described with reference to FIG. In the valve device of the present embodiment, similarly to the second embodiment, the concave portion is configured in two stages, and the outer concave portion 21 is provided with a seal member 22 made of a good lubricating member.
A seal member 12 made of an elastic member is inserted into the inner concave portion 11, and the outer concave portion 21 and the inside of the valve element 5 are communicated with each other through the pressure guiding path 9.
1 are configured such that at least one side 23 is common. That is, as shown in FIG.
Are formed so as to be offset leftward (or rightward) with respect to the outer concave portion 21, and one side 23 is aligned at the same position. When the concave portions 11 and 21 are square, they are formed so that at least one side is common, but when the concave portions 11 and 21 are circular, they may be formed so that at least one tangent line is common. Further, the inner recess 11 is formed so as to be smaller than the outer recess 22 and larger than the outlet 4 of the main body 1 as in the second embodiment. Other configurations and the sealing action of the sealing members 12 and 22 are the same as those of the second embodiment as described above.

In the present embodiment, as described above, one side of the two concave portions 11 and 21 is configured to be common, so that the assembling process of attaching the seal members 12 and 22 to the respective concave portions 11 and 21 first includes: The order is such that the end of the seal member 12 is inserted into the common side 23 of the inner concave portion 11 while being aligned, and then the end of the seal member 22 is aligned with the common side 23 of the outer concave portion 21 and inserted. At this time, if the seal member 12 is not properly fitted in the inner concave portion 11, when the seal member 22 is attached to the outer concave portion 21, the seal member Since it is in a state of being raised from the outer peripheral surface of the body 5, mounting failure and displacement of the seal member 12 can be clearly seen in the assembling stage. Therefore, mounting failure and displacement in the assembling stage of the seal member can be prevented. It can always be assembled in a normal state.

Embodiment 4 FIG. 5 shows a configuration of the fourth embodiment of the present invention. 6 is a sectional view taken along line AA of FIG. 5, and FIG. 7 is a sectional view taken along line BB of FIG. FIG. 8 shows the valve element 5 in FIG.
It is explanatory drawing which shows the state rotated 180 degrees from the state of (1). In the present embodiment, in addition to providing the inlet 3 at one end of the main body 1, a plurality of inlets 24, 25 and outlets 26, 27 are provided on the peripheral wall.
And the hollow chamber inside the valve body 5 is partitioned by a partition wall.
The chamber 28 is divided into two chambers 28, 29, 30, one of which is provided with a partition wall 3 at the tip of the hollow cylindrical valve body 5.
The passages 37 of the chamber 28 communicate with one of the outlets 27 in the state of FIG. 38
Is a communication port provided in the partition wall 31. The second chamber 29 is formed in a groove shape in the axial direction by the partition walls 31, 32, 34, 35, and 36, and is a space surrounded by the inner peripheral surface of the main body 1. A concave flow path 41 is formed which communicates one inlet 24 with the other outlet 26 on the same side. The third chamber 30 is a space (internal pressure introduction chamber) surrounded by the peripheral wall of the valve body 2, the partition walls 32, 33, 34, 35, 36 and the end plate 8. The chamber 28 and the chamber 30 are communicated by the provided communication port 39, and the chamber 30 and the recess 11 provided in the peripheral wall portion 42 are communicated by the pressure guiding path 9. The recess 11 has the first embodiment.
Similarly, the sealing member 12 made of an elastic member is inserted,
The seal member 12 faces the other inlet 25 in the state of FIG. Other configurations are the same as those of the first embodiment.

Next, the operation of the present embodiment will be described. FIG.
, The fluid is supplied to the inlet 3 by a pump (not shown),
When supplied to the valves 24 and 25, the valve body storage chamber 2 in the main body 1 and the chambers 28, 29 and 30 in the valve body 5 are filled with fluid, and the internal pressure P is generated in the internal pressure introduction chamber 30. And
A flow a from the inflow port 3 of the main body 1 through the chamber 28 of the valve element 5 to the outflow port 27 of the main body 1 is generated in the chamber 28 along the flow path 40, and a concave flow path 41 is formed in the chamber 29. Along the way, a flow b from the inlet 24 of the main body 1 to the outlet 26 of the main body 1 through the chamber 29 is generated, and the internal pressure introducing chamber 30 is sealed by the internal pressure P generated at the dead end of the flow through the communication port 39. In order to press the member 12 in the direction of the inlet 25, the inlet 25
Then, a flow c is generated, which stops from the point up to the seal member 12.
Here, the sealing member 12 is moved from the pressure guiding passage 9 provided in the concave portion 11.
Is configured so that the internal pressure P acting on the pressure c becomes larger than the pressure acting on the flow c.

Next, when the motor 17 is driven to rotate the valve body 5 by 180 ° as shown in FIG. 8, the flow a entered from the inlet 3 is discharged from the outlet 26 via the flow path 40, The flow c from the inflow port 25 passes through the concave flow path 41 and is discharged from the other outflow port 27, and the flow b from the other inflow port 24 reaches the seal member 12 in the same manner as the flow c in FIG. Stop at By these series of operations, the a, b, and
The three flows of c can be controlled by one on-off valve.

According to the present embodiment, a plurality of flows can be controlled by one valve, and when a plurality of flows are controlled at once in one product, it is necessary to use a plurality of the same three-way valves. And there is only one control,
There is no increase in cost and no complicated control.

Further, in the present embodiment, the seal structure shown in the first embodiment is adopted, but the seal structures of the second and third embodiments can be adopted.

[0028]

As described above, in the valve device of the present invention, a concave portion is formed in the peripheral wall of the valve body so as to be larger than the outlet of the main body, and a sheet-shaped sealing member is inserted into the concave portion. Since a pressure guiding path communicating the recess and the inside of the valve body is provided to introduce the internal pressure to the back surface of the sealing member, when closing the outlet of the main body, the internal pressure is applied to the sheet-like sealing member through the pressure guiding path. By acting, the discharge of the fluid can be prevented because the seal member closes the outflow port.In the case of rotation of the valve body, the internal pressure is reduced to eliminate or minimize the seal pressure at the seal member. Therefore, it is possible to minimize the frictional resistance due to the sealing pressure when rotating the valve element, the starting torque during rotation, and the torque during rotation.

Further, since the concave portion is formed in a plurality of stages and the pressure guiding path is provided so as to communicate the outer concave portion closest to the inner surface of the main body with the inside of the valve body, the internal pressure may be small or unstable. In this case, the required sealing pressure can be secured by supplementing the sealing pressure with the elastic pressure of the inner sealing member.

Further, since the recesses are formed in a plurality of steps and at least one side or tangent of the recesses in each step is made common, when a plurality of seat members are assembled to the valve body,
By visually checking the swelling state at one common side or tangent line that is the mounting end surface of the inner and outer sheet members, it is possible to prevent a seat member from being improperly mounted, dislocated, and the like at the assembly stage.

Further, a plurality of inlets and a plurality of outlets are provided on the peripheral wall of the main body, the inside of the valve body is divided into a plurality of chambers, and a concave portion for inserting a seal member into a peripheral wall of one of the chambers and an internal pressure are provided. Since a pressure-introducing passage for introducing the same is provided, a large number of flows can be controlled by one valve, and when controlling a plurality of flows in one product at a time, a plurality of the same three-way valves are used. There is no need, and only one control is required, which does not increase the cost and complicate the control. In addition, since the above-described seal structure is employed, the operating torque of the valve body is small.

Further, at least one chamber other than the internal pressure introduction chamber provided in the valve body is formed in a groove shape, and a concave flow path is formed by the chamber and the inlet and outlet of the main body. One or more concave channels that flow from the inlet to the outlet can be opened and closed and switched. The flow path configuration in the valve body is also simplified, and the size of the valve device can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a configuration diagram of a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a fourth embodiment of the present invention.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a sectional view taken along the line BB of FIG. 5;

FIG. 8 is an explanatory diagram after the operation in FIG. 5;

[Explanation of symbols]

1 body, 2 valve chambers, 3 inlets, 4 outlets,
5 valve body, 6 hollow chamber, 7 open end, 8 end plate, 9 pressure guide path, 10 flow path port, 11 recess, 12 seal member,
13 Flange, 14 Lid, 15 Rotary shaft, 16
Center hole, 17 motor, 18 O-ring, 19 O-ring, 21 recess, 22 seal member, 24 inlet, 2
5 inlet, 26 outlet, 27 outlet, 28 chambers,
29 chambers, 30 chambers (internal pressure introduction chamber), 31 to 36 partition walls, 37 flow path ports, 38, 39 communication ports, 40 flow paths, 4 flow paths
1 concave channel, 42 peripheral wall.

Claims (6)

[Claims] 1. A body having a fluid inlet and a fluid outlet, and a hollow cylindrical valve body rotatably housed in the body and provided with a flow path port in a peripheral wall, and a rotation position of the valve body A valve device that opens and closes a flow path by aligning or mismatching a flow path opening of the valve body with an outflow port of the main body, wherein a recess formed on the peripheral wall of the valve body so as to be larger than the outflow port. A sheet-shaped sealing member inserted into the concave portion, and a pressure guide path communicating the concave portion and the inside of the valve body so as to introduce internal pressure to the back surface of the seal member. Valve device to do. 2. The valve device according to claim 1, wherein the recess is formed in a plurality of stages, and the pressure guide path is provided so as to communicate the outer recess closest to the inner surface of the main body with the inside of the valve body. Item 4. The valve device according to Item 1. 3. The valve device according to claim 1, wherein the recess is formed in a plurality of stages, and at least one side or a tangent of the recess in each stage is common. 4. The seal member inserted into the outer recess among the seal members inserted into the plurality of recesses is formed of a lubricating member, and the seal member inserted into the inner recess is elastic. 3. The device according to claim 2, wherein the elastic member is formed to be smaller than the lubricating member and larger than an outlet of the main body.
Or the valve device according to claim 3. 5. A plurality of inlets and a plurality of outlets are provided on a peripheral wall of the main body, the inside of the valve body is divided into a plurality of chambers, and the seal member is inserted into a peripheral wall of one of the chambers. The valve device according to any one of claims 1 to 4, wherein the concave portion to be formed and the pressure introducing passage for introducing the internal pressure are provided. 6. The method according to claim 6, wherein at least one of the chambers other than the internal pressure introducing chamber provided in the valve body is formed in a groove shape, and the chamber and the inflow port and the outflow port of the main body constitute a concave flow path. The valve device according to claim 5, characterized in that: