JP2004190835A - Valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform easy turning operation of a valve element by a valve turning operation means in a state to be freed from seizure though seal performance between the valve seat of a valve casing and the seal surface of the valve element is improved. <P>SOLUTION: The valve element 6 in the valve casing 7 is contained controllably of turning around an axis Y, the valve seat 7d of the valve casing 7 and the seal surface 6a of the valve element 6 making relative turning slide contact therewith are formed on a taper surface such that a diameter is further decreased toward the one end side in the direction of a turning operation axis Y, and a valve turning operation means A to effect turning operation of the valve element 6 and a valve moving operation means B to forcibly move the valve element 6, situated in a set valve element situation position, toward the other end side of the turing operation axis Y with linkage between the valve element 6 and the turning operation means A maintained. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, a valve body is housed in a valve box so as to be rotatable around an axis, and a valve seat of the valve box and a sealing surface of the valve body that is slidably contacted with the valve seat are rotatably operated. The present invention relates to a valve formed on a tapered surface having a smaller diameter toward one end in the direction and provided with a valve turning operation means for turning a valve element.
[0002]
[Prior art]
In a conventional valve, the valve shaft protruding from both sides of the valve element in the rotational operation axis direction is supported so as to be rotatable only in a state where movement in the rotational operation axis direction with respect to the valve box is prevented. The valve seat of the valve box and the sealing surface of the valve body are always kept in sliding contact with each other by the urging force of the urging means utilizing the own weight of the valve body or the elastic restoring force of the elastic body. (For example, see Patent Documents 1 and 2.)
[0003]
[Patent Document 1]
JP-A-1-105091 (FIG. 2)
[Patent Document 2]
Japanese Utility Model Publication No. 3-80165 (FIG. 2)
[0004]
[Problems to be solved by the invention]
In this type of valve, the valve seat of the valve box and the sealing surface of the valve body are formed on a tapered surface that becomes smaller in diameter toward one end side in the rotation axis direction, and the valve seat of the valve box and the valve body are Since the sealing surface is constantly urged to slide, the sealing performance between the valve seat of the valve box and the sealing surface of the valve body can be improved. Since the sliding contact resistance is increased, not only the operation by the valve turning operation means becomes heavy, but also there is a possibility that seizure may occur between the valve seat of the valve box and the sealing surface of the valve element.
[0005]
In addition, when the sealing performance of the valve seat and the valve body seal surface is worn down, or the sealing material is plastically deformed, etc., the sealing performance is reduced to the limit of use, remove the valve interposed in the piping path, and remove it. Must be repaired or replaced with a new valve, and the supply of fluid is interrupted until the repair or replacement operation is completed, and maintenance costs are likely to increase.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and its main problem is to improve the sealing performance between a valve seat of a valve box and a sealing surface of a valve body while increasing a valve rotating operation. Another object of the present invention is to provide a valve which can easily perform a rotation operation of a valve element by means without seizure.
[0007]
[Means for Solving the Problems]
A characteristic configuration according to claim 1 of the present invention is that the valve body is housed in the valve box so as to be rotatable around the axis, and the valve seat of the valve box and the sealing surface of the valve body that slides relative to the valve seat. Is a valve having a tapered surface having a smaller diameter toward one end side in the direction of the rotation operation axis, and provided with valve rotation operation means for rotating the valve element,
Valve movement operating means for forcibly moving the valve body at the set valve body arrangement position to the other end side of the rotation operation axis with respect to the valve box while maintaining the linkage between the valve body and the valve rotation operation means. It is in the point provided.
[0008]
According to the above-mentioned characteristic configuration, the valve seat of the valve box and the sealing surface of the valve body are formed on a tapered surface having a smaller diameter toward one end side in the rotation axis direction, and the valve seat of the valve box and the valve body are formed. Is maintained in sliding contact with the sealing surface of the valve body, the sealing performance between the valve seat of the valve box and the sealing surface of the valve element can be improved. However, when the valve element is rotated by the valve rotation operation means, the valve movement operation means is operated to move the valve element at the set valve element arrangement position to the other end side of the rotation operation axis with respect to the valve box. , The sliding contact between the valve seat of the valve box and the sealing surface of the valve element is released, so that the valve element can be rotated with a small operating force.
[0009]
Further, when the rotation operation of the valve body is completed, the valve moving operation means is operated to forcibly move the valve body to the original position where the valve body is disposed. Can be returned to the desired appropriate sliding contact state.
[0010]
Therefore, while the sealing performance between the valve seat of the valve box and the sealing surface of the valve body is enhanced, the turning operation of the valve body by the valve turning operation means can be easily performed without seizure. .
[0011]
The characteristic configuration of the valve according to claim 2 of the present invention is that the valve moving operation means forcibly moves the valve body at the set valve body arrangement position also to one end side of the rotation box axis direction with respect to the valve box. Is provided.
[0012]
According to the above-mentioned characteristic configuration, when the sealing surfaces of the valve seat and the valve body of the valve box are gradually worn as the sliding contact is repeated, or when the sealing material is plastically deformed, the valve moving operation means is operated to operate the setting valve. By forcibly moving the valve body in the body arrangement position to one end side of the rotation direction of the valve body with respect to the valve box, or by forcibly moving only the plastic deformation allowance, the valve seat of the valve box and the sealing surface of the valve body are removed. Can be corrected to an expected sliding contact state or a state close thereto, so that interruption of fluid supply as in the related art can be avoided and maintenance and inspection costs can be reduced.
[0013]
A feature of the valve according to the third aspect of the present invention is that a lock mechanism is provided which can be freely switched between a locked state in which the rotation operation of the valve rotation operation means is prevented and an unlocked state in which the rotation operation is permitted. It is in the point.
[0014]
According to the above-mentioned characteristic configuration, when the valve moving operation means is operated to forcibly move the valve body in the direction of the rotational operation axis, the lock mechanism is switched to the locked state so that the valve body is entrained. Rotation can be reliably prevented.
[0015]
The valve according to claim 4 of the present invention is characterized in that the valve box has a casing provided with a valve chamber that opens toward the other end in the direction of the rotation axis, and a lid that seals the opening of the valve chamber. And a valve shaft positioned at the other end of the valve body in the direction of the rotation axis of the valve body is supported by the lid so as to be retained therethrough in a penetrating state, and a valve body is provided on the outer surface side of the lid. The valve rotation operation means and the valve movement operation means associated with the valve shaft of (1) are assembled.
[0016]
According to the above-mentioned characteristic configuration, the valve body, the valve turning operation means for operating the valve body, and the valve moving operation means are pre-assembled on the lid which is one of the components of the valve box. In addition, the assembling work and the maintenance / inspection work for the valve moving operation means can be easily performed in a large space on the outer surface side of the lid.
[0017]
The valve according to the fifth aspect of the present invention is characterized in that the valve shaft of the valve body allows relative movement in the direction of the axis of rotation operation, and the rotation operation of the valve rotation operation means that rotates integrally. The present invention is characterized in that the body is externally fitted, and a feed operation shaft of a valve moving operation means is provided which is screwed to the valve shaft from the direction of the rotational operation axis.
[0018]
According to the above-mentioned characteristic configuration, the valve rotation operation means and the valve movement operation means can be compactly configured around one valve axis of the valve element.
[0019]
In a characteristic configuration of the valve according to claim 6 of the present invention, a slip prevention mechanism for adjusting the rotational sliding contact resistance of the rotary operating body is assembled between the rotary operating body and the lid of the rotary operating means. On the point.
[0020]
According to the above-mentioned characteristic configuration, when the valve moving operation means is operated to forcibly move the valve body in the direction of the rotational operation axis, the valve body is driven by the rotational sliding resistance of the rotary operation body provided by the slip prevention mechanism. Can be satisfactorily suppressed from rotating together.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
[First Embodiment]
FIG. 1 shows a hydroelectric power plant for water pipes. Of the water pipes 1 buried underground, a water pipe 1 located in a work pit 3 constructed by driving a steel sheet pile 2 or the like around an excavation site. A bypass pipe 4 forming a bypass flow path is connected to a portion corresponding to the hydroelectric power generation installation, and is connected to an intermediate pipe portion 4A of the bypass pipe 4 by a turbine 5A rotating by water flow and a rotation output shaft 5B of the turbine 5A. A power generation unit 5 having a power generator 5C is mounted.
[0022]
In addition, a first operation position where the upstream flow path W1 and the downstream flow path W2 of the water pipe 1 communicate with each other is provided at a branch point between the water pipe 1 and the branch pipe section 4B of the bypass pipe 4 (see FIG. 2A). ), A second operating position (see (b) in FIG. 2) where the upstream flow path W1 of the water pipe 1 and the branch flow path W3 of the bypass pipe 4 communicate with each other, and the upstream flow path W1 and the downstream of the water pipe 1. A three-way valve, which is an example of the valve of the present invention, including a valve element 6 that can be switched to a third operation position (see C in FIG. 2) where the side flow path W2 and the branch side flow path W3 of the bypass pipe 4 communicate with each other. A valve V is interposed, and a first point at which the upstream flow path W1 and the downstream flow path W2 of the water pipe 1 communicate with each other at the junction of the water pipe 1 and the junction pipe section 4C of the bypass pipe 4. A fourth operation in which the operating position (see FIG. 2A) and the merging-side flow path W4 of the bypass pipe 4 and the downstream-side flow path W2 of the water pipe 1 communicate with each other. The third operation position (see C in FIG. 2) in which the position (see d in FIG. 2) and the upstream flow path W1 of the water pipe 1 communicate with the downstream flow path W2 and the merging flow path W4 of the bypass pipe 4. A three-way valve V, which is an example of the valve of the present invention, is provided with a valve body 6 which can be switched.
[0023]
The valve body 6 of the three-way valve V interposed at the branch point between the water pipe 1 and the bypass pipe 4 and the valve element of the three-way valve V interposed at the junction of the water pipe 1 and the bypass pipe 4 6 is switched to the first operation position, the bypass pipe 4 is closed, and the tap water is made to flow only to the water pipe 1 in the first state, and the valve element 6 of the three-way valve V1 at the branch point is moved to the first state. By switching the valve body 6 of the three-way valve V at the junction to the fourth operation position at the second operation position, the middle part of the water pipe 1 located between the branch point of the bypass pipe 4 and the junction is operated. It is closed to enter a second state in which tap water flows through the bypass pipe 4, and the valve bodies 6 of the two three-way valves V are switched to the third operation state, respectively. 3rd state in which the fluid is distributed and supplied to the bypass pipe 4 at a predetermined ratio. It made.
[0024]
Next, the structure of the three-way valve V will be described. As shown in FIGS. 2 to 6, a valve box 7 that accommodates a valve element 6 so as to be rotatable around a vertical axis Y is provided with three connection parts. A casing 7A having a pipe portion 7a and having a valve chamber 7b communicating therewith and formed upwardly on the other end side in the direction Y of the rotation axis, and an opening of the valve chamber 7b are sealed. In this state, the cover 7B is detachably fastened and fixed to the upper connecting flange portion 7c of the casing 7A with bolts 8 and nuts 9 and is slidably rotatable relative to the valve seat 7d of the casing 7A. The sealing surface 6a of the valve body 6 that is in contact with the valve body 6 is formed as a tapered surface having a smaller diameter toward the lower side, which is one end side in the direction of the rotation axis, and the sealing surface 6a of the valve body 6 Moves from the first operation position to the fourth operation position. When location, the sealant 11 for sealing between the valve seat 7d of the casing 7A is mounted.
[0025]
At a position corresponding to the rotation axis Y on the upper side of the valve element 6, the bush 10 rotates through the bearing hole 7e formed in the lid 7B via the bush 10 and is movable in the rotation axis Y direction. The first valve shaft 6A to be supported is fastened and fixed with a plurality of bolts 16 and nuts 17, and the bottom wall of the casing 7A is located at a position corresponding to the rotation operation axis Y on the lower side of the valve body 6. A second valve shaft 6B, which is rotatably supported via a bush 10 and movably in the rotation operation axis Y direction, is integrally formed in a bearing recess 7g formed in 7f.
[0026]
On the outer surface side (upper surface side) of the lid 7B of the valve box 7, a valve turning operation means A for turning the valve body around the rotation operation axis Y, and the valve turning operation means A A valve moving operation means for forcibly moving the valve body 6 at the set valve body arrangement position to the upper side which is the other end side of the rotation operation axis Y with respect to the valve box 7 while maintaining the cooperation with the valve body 6. B, when the valve body 6 is located at any of the above-mentioned first operation position to fourth operation position, a lock state for preventing the rotation operation of the valve rotation operation means A and a lock for allowing the rotation operation. A lock mechanism C that can be freely operated to switch between the unlocked state and the unlocked state is assembled.
[0027]
As shown in FIGS. 3 to 5, the valve rotation operation means A forms a spline-shaped operation engagement portion 12 a on a first valve shaft 6 </ b> A of the valve body 6 with a manual operation tool such as a plug operation lever. The rotary operation body 12 is fitted on the outside, and a key groove 12b for engaging with the key 13 fitted on the first valve shaft 6A is formed on the inner peripheral surface of the rotation operation body 12, The operating body 12 is configured to rotate integrally with the first valve shaft 6A of the valve body 6 in a state of allowing relative sliding in the rotation operation axis Y direction with respect to the first valve shaft 6A.
[0028]
A flange portion 12c formed on the lower end side of the rotary operation body 12 has a concave portion 14a of the mounting board 14 which is fixed to the outer surface of the lid 7B with bolts 18 and a cylindrical shape which is fixed to the concave portion 14a with bolts 19. The flange 12c of the rotary operation body 12 and the flange formed at the upper end of the cylindrical case 15 are movably mounted within a fixed range in the vertical direction in the mounting space 20 formed by the case 15 and 15a, a support ring 21 for holding the rotary operation body 12 so as to be relatively rotatable is interposed. Further, between the lower end surface of the rotary operation body 12 and the concave portion 14a of the mounting board 14, a rotation operation is performed. A slip prevention mechanism 22 for adjusting the sliding contact resistance of the body 12 is assembled.
[0029]
The slip prevention mechanism 22 includes a first plate 22b contacting a washer 22a fitted and held on the lower end surface of the rotary operation body 12, and a plurality of adjustment screws 22c screwed into the recess 14a of the mounting board 14 from below. And a disc spring 22e interposed between the two plates 22b and 22d, and the rotary operation body 12 is slidably contacted by the adjusting screw 22c. It is configured to adjust the resistance.
[0030]
As shown in FIGS. 3 to 5, the valve movement operation means B includes a rotation operation cap 23 for a manual operation tool such as a wrench in a screw hole 6 b formed in the first valve shaft 6 </ b> A of the valve body 6. The male screw portion 24b of the feed operation shaft 24 is screwed from the rotation operation shaft center Y direction, and a flange portion 24a formed at the upper and lower middle portion of the feed operation shaft 24 is formed on the upper end side of the rotation operation body 12. It is relatively rotatably assembled between the recessed portion 12c and the cover plate 25 which is fastened and fixed by bolts 26 in a state of sealing the recessed portion 12c, and rotates the feed operation shaft 24 via the rotation operation cap 23. When operated, the first valve shaft 6A of the valve body 6 screwed thereto is forcibly moved along the vertical direction which is the rotation operation axis Y.
[0031]
In addition, between the upper portion of the valve element 6 at the set valve element disposition position and the lid 7B of the valve box 7 vertically opposed to the upper part of the valve element 6, the valve element 6 at the set valve element disposition position is located above Is formed between the upper end surface of the first valve shaft 6A of the valve body 6 and the uppermost position of the male screw portion 24b of the feed operation shaft 24. A moving operation margin for forcibly moving the valve element 6 at the valve element disposition position to the valve box 7 toward the upper side which is the other end side of the rotational operation axis Y is formed.
[0032]
Further, between the lower part of the valve element 6 at the set valve element disposition position and the bottom wall 7f of the casing 7A of the valve box 7 vertically opposed to the valve element 6, the valve at the set valve element disposition position is provided. A gap (flexibility) is formed to allow forced downward movement of the body 6, and the lowermost position of the male screw portion 24b of the feed operation shaft 24 and the deepest position of the screw hole 6b of the first valve shaft 6A. Between them, there is formed a movement margin for forcibly moving the valve body 6 at the set valve body arrangement position with respect to the valve box 7 to the lower side which is one end side of the rotation operation axis Y.
[0033]
Further, the cover plate 25 detects the operation rotation speed of the feed operation shaft 24, and sets the setting valve based on the screw pitch at the screwing portion between the screw hole 6b of the first valve shaft 6A and the male screw of the feed operation shaft 24. A detector 27 is provided which calculates the amount of movement of the valve body 6 at the body arrangement position and digitally displays the calculated amount.
[0034]
As shown in FIGS. 5 and 6, the lock mechanism C includes an operation shaft 28 having a rotation operation engaging portion 28 a for a manual operation tool such as a wrench on the mounting board 14, and a rotation operation shaft of the valve body 6. The valve body 6 is rotatably mounted around a vertical axis parallel to the core Y, and at four circumferential positions of the flange portion 12c of the rotary operation body 12, the valve body 6 is moved from the first operation position to the fourth operation position. In any position, the fan-shaped cam 29 provided on the operating shaft 28 engages through the opening formed in the cylindrical case 15 to form the arc-shaped engaging concave portion 30 for preventing the rotation of the rotary operating body 12. Have been.
[0035]
[Other embodiments]
(1) In the above-described first embodiment, the valve rotation operation means A and the valve movement operation means B are configured to be rotated by an artificial operation force. However, the rotation is controlled by an actuator such as a pulse motor. May be.
(2) In the first embodiment described above, the case where the valve is a three-way valve is described as an example, but the technology of the present invention can be applied to a four-way valve, a two-way valve, and the like.
(3) As the valve rotation operation means A, any structure may be used as long as it can rotate the valve body 6 around the rotation operation axis Y.
(4) As the valve movement operation means B, the valve body 6 at the set valve body arrangement position is rotated at least with respect to the valve box 7 while maintaining the linkage between the valve body 6 and the valve rotation operation means A. Any structure may be used as long as it can be forcibly moved to the other end in the operation axis direction.
[Brief description of the drawings]
FIG. 1 is a plan view of a hydraulic power plant for water pipes showing a first embodiment of the present invention; FIG. 2 shows a switching state of a three-way valve of the present invention;
(A) is a cross-sectional plan view at the first operation position, (B) is a cross-sectional plan view at the second operation position, (C) is a cross-sectional plan view at the third operation position, and (D) is a fourth plan view. FIG. 3 is a cross-sectional front view when the valve body is at the set arrangement position. FIG. 4 is a cross-sectional front view when the valve body is forcibly moved upward from the set arrangement position. FIG. 5 is an enlarged sectional front view of a main part. FIG. 6 is an enlarged sectional plan view of a lock mechanism.
A valve rotation operation means B valve movement operation means C lock mechanism Y rotation operation shaft 6 valve body 6A first valve shaft 6a sealing surface 7 valve box 7A casing 7B lid 7b valve chamber 7d valve seat 12 rotation operation body 22 slip Prevention mechanism 24 Feed operation axis

Claims (6)

The valve body is rotatably housed around the axis in the valve box, and the valve seat of the valve box and the seal surface of the valve body that is slidably contacted with the valve seat at one end in the direction of the shaft axis. A valve formed with a taper surface having a smaller diameter, and provided with valve turning operation means for turning the valve element,
Valve movement operating means for forcibly moving the valve body at the set valve body arrangement position to the other end side of the rotation operation axis with respect to the valve box while maintaining the linkage between the valve body and the valve rotation operation means. Valve provided. 2. The valve moving operation means is provided with a moving operation allowance for forcibly moving the valve element at the set valve element arrangement position to one end side of the valve box in the direction of the rotational operation axis. The described valve. 3. The valve according to claim 1, further comprising a lock mechanism operable to switch between a locked state in which the rotation operation of the valve rotation operation means is prevented and an unlocked state in which the rotation operation is permitted. The valve box includes a casing having a valve chamber that opens toward the other end in the direction of the rotation axis, and a lid that closes the opening of the valve chamber. A valve shaft located on the other end side in the axial direction is supported by the lid in a penetrating state so as to be retained therethrough, and on the outer surface side of the lid, a valve rotating operation means and a valve linked to the valve shaft of the valve body are provided. 4. The valve according to claim 1, further comprising a moving operation means. On the valve shaft of the valve body, a rotary operation body of valve rotation operation means which allows relative movement in the direction of the rotation operation shaft center and is integrally rotated is fitted around the valve shaft. 5. The valve according to claim 4, further comprising a feed operation shaft of the valve movement operation means screwed from the rotation operation shaft center direction. 6. The valve according to claim 5, wherein a slip prevention mechanism for adjusting a rotational sliding contact resistance of the rotary operating body is mounted between the rotary operating body and the lid of the rotary operating means.

Images