JP2013142460A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve device, in which the rotating operation of an inner cylinder is smoothly performed by reducing starting torque when rotating the inner cylinder.SOLUTION: A valve device 1 includes a casing 2 having an inflow port 4 and an outflow port 5 of a fluid, and a valve element 3 mounted in the casing 2. The valve element 3 includes an outer cylinder 10 and an inner cylinder 20 rotatably mounted in the outer cylinder 10. A peripheral wall part 11 of the outer cylinder 10 is circumferentially formed with a first outer cylinder side opening 12 and a second outer cylinder side opening 13. The first outer cylinder side opening 12 communicates with the outflow port 5 of the casing 2, and an internal passage 21 communicating with the inflow port 4 of the casing 2 is formed inside the inner cylinder 20. A peripheral wall part 24 is circumferentially formed with a first inner cylinder side opening 25 and a second inner cylinder side opening 26, and the first outer cylinder side opening 12 and the first inner cylinder side opening 25 are put in communication or not put in communication by the rotation of the inner cylinder 20 to open/close a passage for the flow of the fluid. The second outer cylinder side opening 13 and the second inner cylinder side opening 26 are formed in mutually communicating positions in the closed state of the passage.

Description

  The present invention relates to a valve device that controls the flow rate of a fluid.

  2. Description of the Related Art Conventionally, there has been known a valve device including an outer cylinder having a fluid inlet and outlet and a hollow cylindrical inner cylinder that is rotatably housed in the outer cylinder and has a flow passage opening in a peripheral wall portion. ing. Since such a valve device opens and closes the flow path by aligning or mismatching the flow path port with the outlet of the outer cylinder by rotation of the inner cylinder, as a structural problem, the internal resistance is caused by the frictional resistance between the inner cylinder and the outer cylinder. The cylinder cannot be rotated smoothly, and a large starting torque may be required for rotation.

  Therefore, in Patent Document 1, a recess is formed in the peripheral wall portion of the inner cylinder so as to be larger than the outlet of the main body, a sheet-like seal member is inserted into the recess, and an internal pressure is introduced into the back surface of the seal member. Thus, a valve device provided with a pressure guiding path that communicates the recess and the inside of the outer cylinder has been proposed.

  When this valve device closes the outlet of the outer cylinder, the pressure of the fluid supplied from the inlet by the operation of the pump is applied to the seal member in the recess from the pressure guiding path, and the seal member is pressed against the outlet. Thus, the outlet is closed to stop the flow of fluid. And when rotating the inner cylinder so as to open the outlet, the inner cylinder is rotated in a state where the internal pressure is reduced, so that the contact pressure between the seal member and the inner surface of the outer cylinder is reduced, and the frictional resistance is reduced. The starting torque at the time of rotation can be reduced.

Japanese Patent Laid-Open No. 11-94100

  However, in the valve device of Patent Document 1, when the inner cylinder is rotated so as to open the outlet, it is necessary to reduce the internal pressure by, for example, stopping the operation of the pump. A large starting torque is required during rotation.

  The present invention has been made in view of the circumstances as described above, and provides a valve device that can reduce the starting torque during rotation of the inner cylinder and smoothly perform the rotation operation of the inner cylinder. It is an issue.

  In order to solve the above-described problems, a valve device of the present invention includes a casing having an inflow port through which a fluid flows in and an outflow port through which the fluid flows out, and a valve body installed in the casing. Has a cylindrical outer cylinder and a cylindrical inner cylinder that is rotatably mounted in the outer cylinder, and the first outer cylinder side opening and the second that penetrate the inside and outside of the peripheral wall portion of the outer cylinder. And the first outer cylinder side opening communicates with the outlet of the casing, and the inner cylinder has an internal flow communicating with the inlet of the casing. A first inner cylinder side opening and a second inner cylinder side opening penetrating inward and outward are formed in the peripheral wall portion in the circumferential direction, and the first outer cylinder side opening is formed by rotation of the inner cylinder. A valve device that opens and closes a flow path through which a fluid flows through the first inner cylinder side opening in communication or non-communication. The second of the outer cylinder side opening second inner cylinder side opening, characterized in that it is formed at a position communicating with each other during the closed state of the channel.

  In this valve device, a part in the circumferential direction of the peripheral wall portion of the inner cylinder is constituted by a small-diameter portion whose outer diameter is smaller than other portions in the circumferential direction, and the second inner cylinder is formed in the small-diameter portion. A side opening is preferably formed.

  Further, in this valve device, the peripheral wall portion of the inner cylinder is provided with a notch portion penetrating inward and outward on the inlet side of the casing, and the notch portion is provided when the flow path is closed. It is preferable to be formed at a position communicating with the second outer cylinder side opening.

  According to the valve device of the present invention, the starting torque at the time of rotation of the inner cylinder can be reduced, and the inner cylinder can be smoothly rotated.

It is sectional drawing which shows one Embodiment of the valve apparatus of this invention. (A) is a perspective view of the outer cylinder of the valve body in the valve apparatus of FIG. 1, (b) is a perspective view of the inner cylinder of the valve body in the valve apparatus of FIG. (A) is the sectional view on the AA line of the valve apparatus of FIG. 1, (b) shows the state which closed the flow path by rotating the inner cylinder of the valve body in the valve apparatus of (a) to the circumferential direction. It is sectional drawing. (A) is a perspective view of the inner cylinder of the valve body in the valve apparatus of another one Embodiment, (b) is sectional drawing of the valve apparatus using the inner cylinder of (a). It is a perspective view of the inner cylinder of the valve body in the valve apparatus of another one embodiment.

  The valve device of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the valve device of the present invention. 2A is a perspective view of the outer cylinder of the valve body in the valve device of FIG. 1, and FIG. 2B is a perspective view of the inner cylinder of the valve body in the valve device of FIG. FIG. 3A is a cross-sectional view taken along line AA of the valve device of FIG. 1, and FIG. 3B is a view of the valve device of FIG. It is sectional drawing which shows a state.

  As shown in FIG. 1, the valve device 1 includes a casing 2 and a valve body 3. For example, the valve device 1 is disposed in an external flow path 6 such as a water supply pipe to increase or decrease the flow rate of a fluid such as water. Can be used to control.

  The casing 2 has a valve body housing space in which the valve body 3 is housed, and has an inlet 4 through which a fluid flows in and an outlet 5 through which the fluid flows out. 5 communicates with the valve body storage space. The casing 2 is disposed so that the inflow port 4 and the outflow port 5 communicate with the external flow path 6 respectively.

  The valve body 3 includes an outer cylinder 10 and an inner cylinder 20 and is housed in the valve body storage space of the casing 2. The valve body 3 is formed such that a gap between the outer peripheral surface of the outer cylinder 10 of the valve body 3 and the inner peripheral surface of the casing 2 is small, and the gap is sealed with an elastic member such as silicon rubber or EPDM. May be.

  The outer cylinder 10 is formed in a cylindrical shape as shown in FIG. 2A, and a first outer cylinder side opening 12 and a second outer cylinder side opening 13 penetrating inside and outside of the peripheral wall portion 11 are circumferential. Formed apart in the direction. As shown in FIG. 1, the first outer cylinder side opening 12 of the outer cylinder 10 communicates with the outlet 5 of the casing 2 in a state where the valve element 3 is housed in the valve element housing space of the casing 2. The number of the second outer cylinder side openings 13 is not particularly limited, and may be one or two or more. The formation location of the second outer cylinder side opening 13 is not particularly limited, and in the present embodiment, one second outer cylinder side opening 13 is provided at a position facing the diameter direction of the first outer cylinder side opening 12. Is formed.

  An insertion hole 14 through which the inner cylinder 20 is inserted and fluid flows is formed at one end of the outer cylinder 10 in the cylinder axis direction. The insertion hole 14 is substantially the same diameter as the outer diameter of the inner cylinder 20. And communicates with the inlet 4 of the casing 2. A through hole 15 having an inner diameter smaller than the inner diameter of the insertion hole 14 is formed at the other end, and the inner diameter of the through hole 15 is such that a rotation shaft portion 23 of the inner cylinder 20 described later can be inserted through the rotation. It is formed to be slightly larger than the outer diameter of the shaft portion 23.

  The inner cylinder 20 is formed in a cylindrical shape as shown in FIG. 2B, and is rotatably mounted in the outer cylinder 10 as shown in FIG. The outer diameter of the inner cylinder 20 is substantially the same as the inner diameter of the outer cylinder 10 so that the gap between the outer peripheral surface of the inner cylinder 20 and the inner peripheral surface of the outer cylinder 10 is reduced. The gap between the outer peripheral surface of the inner cylinder 20 and the inner peripheral surface of the outer cylinder 10 may be sealed with an elastic member such as silicon rubber or EPDM. An internal flow path 21 through which a fluid flows is formed inside the inner cylinder 20, and the internal flow path 21 is formed in the casing 2 via an opening 22 formed at one end of the inner cylinder 20 in the cylinder axis direction. To the inflow port 4. A rotating shaft portion 23 is formed at the other end portion of the inner cylinder 20 in the cylinder axis direction. By inserting the rotating shaft portion 23 into the insertion hole 14 and the through hole 15 of the outer cylinder 10 in sequence, the inner cylinder 20 is formed. It is mounted in the outer cylinder 10.

  The rotation shaft portion 23 of the inner cylinder 20 is connected to the rotation drive shaft of the motor 50, and the inner cylinder 20 can be rotated in the circumferential direction by rotating the rotation drive shaft.

  A first inner cylinder side opening 25 and a second inner cylinder side opening 26 penetrating inward and outward are formed in the peripheral wall portion 24 of the inner cylinder 20 apart in the circumferential direction. The first inner cylinder side opening 25 is formed to be able to communicate with the first outer cylinder side opening 12 of the outer cylinder 10, and between the first inner cylinder side opening 25 and the second inner cylinder side opening 26. A non-opening closing portion 27 is formed in the peripheral wall portion 24.

  The valve device 1 according to this embodiment causes the first outer cylinder side opening 12 and the first inner cylinder side opening 25 to communicate with each other or to communicate fluid by rotating the inner cylinder 20 in the circumferential direction. The flow path is opened and closed, and the fluid is passed or stopped. That is, as shown in FIG. 1 and FIG. 3A, when the first inner cylinder side opening 25 overlaps the first outer cylinder side opening 12 by the rotation of the inner cylinder 20, the first outer cylinder side opening. 12 and the first inner cylinder side opening 25 communicate with each other, the flow path is opened, and a water flow state is established. Since the flow rate of the circulating fluid changes depending on the overlapping degree of the first outer cylinder side opening 12 and the first inner cylinder side opening 25, the fluid flow rate can be changed by adjusting the overlapping degree. . As shown in FIG. 3B, when the closing portion 27 overlaps the first outer cylinder side opening 12 due to the rotation of the inner cylinder 20, the first outer cylinder side opening 12 and the first inner cylinder side opening 25. Is disconnected, and the flow path is closed and water is stopped. Thus, the flow rate of the fluid is adjusted by rotating the inner cylinder 20 so that the first inner cylinder side opening 25 and the closing portion 27 of the inner cylinder 20 overlap the first outer cylinder side opening 12 of the outer cylinder. Can do.

  As shown in FIG. 3B, the second inner cylinder side opening 26 is a second outer cylinder side opening when the flow path is at least one of a closed state and a closed state. 13 and the 2nd inner cylinder side opening 26 are formed in the position where it communicates. That is, the second outer cylinder side opening 13 and the second inner cylinder side opening 26 communicate with each other such that the second inner cylinder side opening 26 overlaps the second outer cylinder side opening 13 when the flow path is closed. If it does, the communication state of the 2nd outer cylinder side opening 13 and the 2nd inner cylinder side opening 26 at the time of the open state of a flow path will not ask | require. The second outer cylinder side opening 13 and the second inner cylinder side opening 26 may be in communication with each other, or may be in non-communication. In the present embodiment, the second outer cylinder side opening 13 and the second inner cylinder side opening 26 communicate with each other even when the flow path is open. In any case, due to the communication between the second outer cylinder side opening 13 and the second inner cylinder side opening 26, the pressure by the fluid that fills the inside of the outer cylinder 10 and the inner cylinder 20 in the water-stopping state is outside. Opened to a low level. Accordingly, it is possible to reduce the starting torque of the inner cylinder 20 when the inner cylinder 20 is rotated in order to open the flow path and make the water passage state, and the inner cylinder 20 can be smoothly rotated. . Accordingly, when the inner cylinder 20 is rotated by the motor 50 as in the present embodiment, an inexpensive motor with a low starting torque can be employed, and the valve device 1 can be manufactured at a low cost. When the rotating operation of the inner cylinder 20 is performed manually, the rotating operation of the inner cylinder 20 is facilitated, for example, the inner cylinder 20 can be rotated with a light force, and the operability is improved.

  In the present embodiment, as described above, the second outer cylinder side opening 13 and the second inner cylinder side opening 26 are formed so as to communicate with each other even when the flow path is open. For this reason, the pressure by the fluid that fills the inside of the outer cylinder 10 and the inside of the inner cylinder 20 in the water passing state is released to the outside by the communication between the second outer cylinder side opening 13 and the second inner cylinder side opening 26. Is kept low. Thereby, in addition to the above-described effects, the operating torque for rotating the inner cylinder 20 during water flow can be reduced, and the rotating operation of the inner cylinder 20 can be performed more smoothly.

  FIG. 4A is a perspective view of an inner cylinder of a valve body in a valve device according to another embodiment, and FIG. 4B is a cross-sectional view of the valve device using the inner cylinder of FIG. In addition, the same code | symbol is attached | subjected to the same part as embodiment shown in FIGS. 1-3, and the description is abbreviate | omitted.

  In the valve device 40, a part of the circumferential wall portion 24 of the inner cylinder 60 is configured with a small-diameter portion 28 having a smaller outer diameter than other portions in the circumferential direction. Specifically, the peripheral wall portion 24 of the inner cylinder 60 is configured to include a portion having a small outer diameter that becomes the small-diameter portion 28 and a portion having an outer diameter larger than the outer diameter of the small-diameter portion 28. They are formed on the same circumference. A portion having an outer diameter larger than the outer diameter of the small-diameter portion 28 constitutes a large-diameter portion 29. The inside of the inner cylinder 60 has a substantially circular shape in cross section, the small diameter portion 28 is configured as a thin portion 30 with a thin wall thickness of the peripheral wall portion 24, and the large diameter portion 29 has a wall thickness of the peripheral wall portion 24 with a small diameter portion 28. It is comprised as the thick part 31 thicker than this wall thickness.

  The outer diameter of the large-diameter portion 29 is substantially the same as the inner diameter of the outer cylinder 10, and the gap between the outer peripheral surface of the large-diameter portion 29 and the inner peripheral surface of the outer cylinder 10 is formed to be small. The gap may be sealed with an elastic member such as silicon rubber or EPDM. A first inner cylinder side opening 25 is formed in the large diameter portion 29, and the periphery of the first inner cylinder side opening 25 is surrounded by the large diameter portion 29. Therefore, the first outer cylinder side opening 12 and the first inner cylinder side opening 25 when the first outer cylinder side opening 12 and the first inner cylinder side opening 25 communicate with each other (water passage state). The outflow of fluid from between the two can be suppressed. The large diameter portion 29 is also formed with a closing portion 27.

  A pressure relief gap S is formed between the outer peripheral surface of the small diameter portion 28 and the inner peripheral surface of the outer cylinder 10. A second inner cylinder side opening 26 is formed in the small diameter portion 28. Since the second inner cylinder side opening 26 can communicate with the second outer cylinder side opening 13 of the outer cylinder 10 through the gap S, the second inner cylinder side opening 26 is formed in the small diameter portion 28. May not be a position that overlaps (matches) the second outer cylinder side opening 13 of the outer cylinder 10 when the flow path is closed.

  In the above configuration, the fluid flows into the gap S from the second inner cylinder side opening 26 of the inner cylinder 60. For this reason, the pressure by the fluid that fills the inside of the outer cylinder 10 and the inside of the inner cylinder 60 in the water stop state or the water passage state escapes to the outside of the inner cylinder 60, and as a result, the pressure of the fluid inside the inner cylinder 60 is It can be kept low. Accordingly, it is possible to reduce the starting torque of the inner cylinder 60 when rotating the inner cylinder 60 in order to change the water stop state to the water passage state, and the operating torque for rotating the inner cylinder 60 when water passes. 60 rotational movements can be performed more smoothly. The flowing of the large diameter portion 29 of the fluid flowing into the gap S is prevented by the large diameter portion 29 configured as the thick portion 31 and the elastic member described above, and the first outer cylinder of the outer cylinder 10 is prevented. The outflow of fluid from the side opening 12 is suppressed.

  Such a small-diameter portion 28 may be configured over the entire length in the cylinder axis direction of the peripheral wall portion 24 of the inner cylinder 60. Further, in the circumferential direction of the peripheral wall portion 24 of the inner cylinder 60, a range from the portion where the closing portion 27 is formed to the portion where the first inner cylinder side opening 25 is formed is configured as the large diameter portion 29, The other range can be configured as the small diameter portion 28. By configuring the small-diameter portion 28 over the widest possible range in the peripheral wall portion 24 of the inner cylinder 60, the pressure by the fluid that fills the inside of the outer cylinder 10 and the inside of the inner cylinder 60 in the water-stopped state or the water-flowing state. Can be suppressed more effectively.

  FIG. 5 is a perspective view of an inner cylinder of a valve body in a valve device according to another embodiment. In addition, the same code | symbol is attached | subjected to the same part as embodiment shown in FIGS. 1-4, and the description is abbreviate | omitted.

  The peripheral wall 24 of the inner cylinder 70 of the valve device is provided with a notch 32 penetrating inward and outward on the inflow side of the casing. The notch 32 is connected to the opening 22 formed at one end of the inner cylinder 70 in the cylinder axis direction, and is formed in a rectangular shape. The number of the notches 32 is not particularly limited, and may be one or two or more. In the present embodiment, one notch portion 32 is provided in the peripheral wall portion 24.

  The notch 32 is formed at a position communicating with the second outer cylinder side opening when the flow path is closed. The effect of forming such a notch 32 is the same as the effect of forming the second inner cylinder side opening 26. That is, due to the communication between the second outer cylinder side opening and the notch 32, the pressure by the fluid filling the inside of the outer cylinder and the inside of the inner cylinder 70 in the water stop state is released to the outside and is kept low. Accordingly, it is possible to reduce the starting torque of the inner cylinder 70 when the inner cylinder 70 is rotated in order to open the flow path and make the water passage state, and the inner cylinder 70 can be smoothly rotated. . In the present embodiment, a synergistic effect of the effect of the communication between the second outer cylinder side opening and the second inner cylinder side opening 26 and the effect of the communication between the second outer cylinder side opening and the notch 32 is achieved. In addition, it is possible to more effectively reduce the starting torque of the inner cylinder 70 when the inner cylinder 70 is rotated in order to change the water stop state to the water passage state.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. For example, in the inner cylinder 70 of the valve body in the valve device shown in FIG. 5, as shown in FIG. 4, a part of the circumferential wall portion 24 in the circumferential direction may be constituted by a small diameter portion 28. In this case, the notch 32 can be formed in the small diameter portion 28. The notch portion can communicate with the second outer cylinder side opening of the outer cylinder through a pressure release gap between the outer peripheral surface of the small diameter section and the inner peripheral surface of the outer cylinder. The position where the notch is formed does not have to be a position that overlaps (matches) the second outer cylinder side opening of the outer cylinder when the flow path is closed. In the valve device having such a configuration, it is possible to further reduce the starting torque of the inner cylinder when rotating the inner cylinder and the operating torque of rotating the inner cylinder when passing water in order to change the water stop state to the water passage state. The inner cylinder can be rotated more smoothly.

DESCRIPTION OF SYMBOLS 1,40 Valve apparatus 2 Casing 3 Valve body 4 Inlet 5 Outlet 10 Outer cylinder 11 Peripheral wall part 12 1st outer cylinder side opening 13 2nd outer cylinder side opening 20,60,70 Inner cylinder 21 Internal flow path 24 Peripheral wall part 25 1st inner cylinder side opening 26 2nd inner cylinder side opening 28 Small diameter part 32 Notch part

Claims (3)

  A casing having an inflow port for injecting fluid and an outflow port for outflowing fluid and a valve body provided in the casing are provided, and the valve body is provided in a cylindrical outer tube and rotatably provided in the outer tube. And a first outer cylinder side opening and a second outer cylinder side opening penetrating inward and outward are formed in the circumferential direction on the peripheral wall portion of the outer cylinder, and the first outer cylinder side opening is formed in the circumferential direction. The outer cylinder side opening of the inner cylinder communicates with the outlet of the casing, and an inner flow path communicating with the inlet of the casing is formed inside the inner cylinder, and the first inner wall penetrating inward and outward is formed in the peripheral wall portion. A cylinder side opening and a second inner cylinder side opening are formed in the circumferential direction, and the first outer cylinder side opening and the first inner cylinder side opening are connected or disconnected by rotation of the inner cylinder. A valve device for opening and closing a flow path through which a fluid flows, wherein the second outer cylinder side opening and the second inner cylinder side opening are: Valve apparatus characterized by being formed at a position communicating with each other during the closed state of Kiryuro.   A part in the circumferential direction of the peripheral wall portion of the inner cylinder is constituted by a small diameter portion having a smaller outer diameter than other portions in the circumferential direction, and the second inner cylinder side opening is formed in the small diameter portion. The valve device according to claim 1, wherein:   A cutout portion penetrating inward and outward is provided on the peripheral wall portion of the inner cylinder on the inlet side of the casing, and the notch portion and the second outer cylinder side opening when the flow path is closed. The valve device according to claim 1, wherein the valve device is formed in a communicating position.

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