JP2020173029A - Eccentric rotation valve - Google Patents

Abstract

To provide an eccentric rotation valve V.SOLUTION: A pair of valve bodies 3, 3 are provided on a valve rod 2 inserted into a valve box 1 in which fluid w is caused to flow through the inner part thereof right and left symmetrically with respect to an axial center (a) thereof. A surface shape of the valve body is formed with an elliptically spherical surface, an elliptically conical surface or a complete sphere, and a valve seat and a valve box valve seat of the valve body have a metal seal structure of elliptically conical surface by themselves. The surface shape of the valve body is the elliptically spherical surface, etc., and the valve body valve seat is continuous without a difference from the surface of the valve body and, therefore, the fluid flowing through the valve body surface draws a curve and the flow is smooth. Center axes c of both valve seats 3a, 1a respectively are off-centered θ from the valve rod axial center (a) to a valve closing direction, therefore, when opening the valve from the valve-closure time, at the same time with rotation start in the valve opening direction of the valve rod, the valve body valve seat and the valve box valve seat are separated at an instant and seal surfaces of the valve body valve seat and the valve box valve seat are not brought into sliding with each other. When a straightening plate 10 is provided in the valve box between both valve bodies 3, 3, circulation becomes smooth. When the valve is closed, protrusions 11 with a groove 12 arranged closely to the valve box valve seat over both valve rod attachment part 1b as valve opening direction front side of both valve bodies are provided right and left of the valve rod and water leakage around the valve body upon valve opening is prevented.SELECTED DRAWING: Figure 4

Description

The present invention is used as a shutoff valve or flow rate regulating valve provided in instrumentation equipment such as water supply, petrochemical plants, power generation equipment, and piping for fluid transportation of water, gas, etc. in industrial water, hydroelectric power generation equipment, etc. It relates to an eccentric rotary valve.

In the funnel valve, etc., the valve body is provided on the left and right sides of the valve box in the tubular axis direction with the valve rod (valve shaft) as the boundary, and the space between the two valve bodies communicates with the inlet and outlet of the valve box. It is a road, and the valve body valve seat and the valve box valve seat are also provided on the left and right sides of the valve box in the tubular axis direction with the valve rod as a boundary.
In this type of valve, by rotating the valve stem around its axis, the valve body valve seat and the valve box valve seat come into contact with each other, the inlet and outlet are opened and closed, and the gangway is opened and closed. It is opened and closed (see Patent Document 1).

In addition, a tubular valve box through which fluid flows, a valve rod inserted in the valve box, and a pair of valve bodies provided on the valve rod on the left and right points symmetrical with respect to its axis. It has a through-passage (bore) that communicates with the inlet and outlet of the valve box formed between the two valve bodies, and the valve seat and the valve box valve seat of the valve body have an elliptical conical surface or the like. Further, a ball valve (ball valve) in which the central axes of both valve seats are eccentric from the axis of the valve stem in the valve closing direction is disclosed (Patent Document 2).
Since this ball valve seals both the inflow port and the outflow port of the valve box, it is said that the valve is surely closed (Patent Document 2, paragraph 0001). Further, since the valve body valve seat and the valve box valve seat have curved surfaces having different curvatures, the valve closing torque is large and the valve closing action is reliable (paragraph 0014 of the same document 2).

Further, as an eccentric rotary valve, a tubular valve box through which fluid flows inside, a valve stem inserted into the valve box, and a valve stem whose axis is separated from the axis of the valve box, and a valve stem eccentrically provided are provided. The valve body (the center of the valve stem is separated from the center of the valve body), the valve body valve seat of the metal sheet whose axis is tilted with respect to the axis of the valve box, and the metal sheet to which the valve body valve seat is in contact with and separated from each other. A triple eccentric rotary valve having a valve box valve seat and a structure having the valve box valve seat has been developed (see Patent Document 3).
Since the sealing surfaces of the valve body valve seat and the valve box valve seat do not slide with each other when the valve is opened and closed, this triple eccentric rotary valve can maintain the sealing performance, extend the service life, and occur when the valve is opened. It is said that it has the effect of suppressing the jumping phenomenon to the utmost limit.

Special Publication No. 59-750 Special Table 2002-538386 (WO00 / 50792) JP-A-2018-173122

The conventional funnel valve (conical plug valve) shown in Patent Document 1 is used at a high pressure because the sliding portion area between the valve body valve seat and the valve box valve seat becomes large when the diameter is relatively large. Then, since the pressure applied to both valve seats becomes high, the sliding resistance is large when the valve is fully closed and opened, and the valve cannot be smoothly opened. Therefore, the valve body is once lifted and the valve body is rotated in a state where the sliding resistance between the valve seats is reduced, and the structure of the rotary drive system of the valve stem is complicated, resulting in high cost.

In the ball valve described in Patent Document 2, when the valve is closed, a positive pressure from the outflow port of the valve box and a positive pressure in the valve box are applied to the valve body to stabilize the valve closed state (the same document). 2 paragraphs 0029).
In order to achieve this effect, the members forming the valve body valve seat and the valve box valve seat have a cylindrical shape, and it is preferable that one of them is an elastic material (paragraph 2, paragraph 0015 of the same document). The durability of the material is a problem.

Since the eccentric rotary valve of Patent Document 3 opens and closes only the inflow port of the valve box, it lacks certainty of valve closing action.

It is an object of the present invention to provide a rotary valve having durability and a reliable valve closing action without lifting the valve body once under the above-mentioned actual conditions.

In order to achieve the above object, the present invention first describes a tubular valve box through which a fluid flows, a valve rod inserted in the valve box, and point symmetry of the valve rod with respect to its axis. It has a pair of valve bodies provided on the left and right sides, and a through-passage that communicates with the inlet and outlet of the valve box formed between the two valve bodies, and the valve box on the inflow port and the outflow side. The valve body valve seats were provided inside, and the valve body valve seats were provided on both valve bodies in contact with the valve box valve seats, respectively, to form an eccentric rotary valve.
In this way, valve box valve seats are provided on the inlet and outlet sides of the valve box, and both valve body valve seats come into contact with the valve box valve seats to seal both the inlet and outlet of the valve box. Since it stops, the valve is surely closed.

Next, the surface shape of the valve body is an elliptical spherical surface, an elliptical conical surface, or a true spherical surface, and the valve body valve seat and the valve box valve seat have a metal seal structure between elliptical spherical surfaces, and the valve body valve seat has a metal seal structure. It is continuous from the surface of the valve body without a step, and the central axes of both valve seats are eccentric from the axis of the valve rod in the valve closing direction.
If the surface shape of the valve body is an elliptical spherical surface, an elliptical conical surface or a true spherical surface, and the valve body valve seat is continuous from the surface of the valve body without a step, the fluid flowing on the surface draws a curved shape, so that flow. Is smooth.
Here, the "surface shape of an elliptical sphere or an elliptical conical surface" means the surface shape of an elliptical sphere or an elliptical conical surface whose cross section becomes elliptical when cut at a plane orthogonal to their axis. Is. In addition, "the central axis of the valve seat is eccentric from the axis of the valve stem in the valve closing direction" means that "the central axis of the valve seat is tilted at a required angle in the valve closing direction with respect to the axis of the valve box". "Aspects that do not pass through the axis of the above" (the same shall apply hereinafter).

Furthermore, because it has a metal seal (seal with a metal surface) structure, it is more durable than a valve seat that uses an elastic material, torque seal can be performed, and the valve closing action is reliable and durable. Will be high.
Further, since the central axes of both valve seats are eccentric from the axis of the valve stem in the valve closing direction, the valve body starts to rotate in the valve opening direction at the same time when the valve is opened from the time of valve closing. Since the valve seat is separated from the valve box valve seat and the sealing surfaces of the valve body valve seat and the valve box valve seat do not slide with each other, it is not necessary to lift the valve body once.

In this configuration, if a straightening vane in the flow direction of the gangway is provided between the two valves, the flow of the gangway between the valve bodies becomes smooth.
Further, in the state where the valve is closed, ridges close to the valve box valve seat are provided on the left and right sides of the valve stem over the valve rod attachment portions on the front side in the valve opening direction of both valve bodies, and the ridge surfaces are provided. If a groove in the circumferential direction of the valve box is formed, the ridge of the valve body approaches the valve box valve seat in the state where the valve is open, and this groove obstructs the flow. The fluid that flows through and flows to the outlet side can be suppressed as much as possible, and a large amount of fluid can flow smoothly through the through path.

In each of the above configurations, the valve body valve seat and the valve box valve seat are elliptical spherical surfaces, the valve body valve seat is an elliptical spherical surface, the valve box valve seat is an elliptical conical surface, or the valve body valve seat and the valve box. It can be an eccentric rotary valve in which the valve seats are elliptical conical surfaces.
At this time, the central axis (axis center) of the elliptical spherical surface or elliptical conical surface of the valve box valve seat and the valve body valve seat is tilted at a required angle with respect to the axis (cylinder axis) of the valve box, and the valve box valve seat and the valve The contact surface of the body valve seat can be brought into contact with the axis of the valve box in a perfect circle in the orthogonal direction to close the valve. This is because if an ellipsoidal sphere and an ellipsoidal cone are cut on an oblique surface at a certain angle with respect to the axis, the cut surface can be a perfect circle.
In this way, when used for a substantially perfect cylindrical pipe, the cross-sectional shape of the fluid is substantially a perfect circle, so that the valve hole becomes a perfect circle, and the cross-sectional shape of the fluid changes from a substantially perfect circle to a perfect circle. By doing so, pressure loss and the like do not occur, and stable fluid flow can be ensured. The term "perfect circle" as used in the present invention does not mean only a circle having the same diameter over the entire circumference, but also includes a case where the diameter changes to the extent that distribution is not affected.

Since the present invention is configured as described above, it can be an eccentric rotary valve having a funnel valve structure having a simple structure.

Cutting front view of one embodiment of the eccentric rotary valve according to the present invention. Cutting plan view of the same embodiment Top view of cutting at the time of valve opening of the same embodiment Operation explanatory diagram of the same embodiment Perspective view of the valve body of the same embodiment Other partial front view of the same embodiment

An embodiment of an eccentric rotary valve according to the present invention is shown in FIGS. 1 to 5, and the eccentric rotary valve V is a tubular cast steel valve box 1 through which a fluid w such as water flows inside, and the valve box 1 thereof. A cast steel valve rod 2 inserted inside and having an axis a on the cylinder shaft o (center of the valve box flow path) of the valve box 1, and a cast steel valve body (plug) 3 provided on the valve rod 2. , An eccentric rotary valve (plug valve) having a valve box valve seat 1a in which both valve body valve seats (seat portions) 3a are brought into contact with each other. The valve box 1 has a tubular left opening as an inflow port 4 and an opening on the right side as an outflow port 5, and is composed of two members, the inflow port 4 side and the outflow port 5 side, and a bolt 6 is provided around both members. It is fastened and integrated by.
One end (upper end in FIG. 1) of the valve stem 2 extends to the outside and is rotated by various means such as a handle and an actuator.

The valve body 3 is provided on the left and right points symmetrically with respect to the axial center a (so that they overlap when rotated 180 degrees about the axial center a) in the axial view (planar view) of the valve rod 2. ing. A through-passage 7 communicating with the inflow port 4 and the outflow port 5 is formed between the two valve bodies 3 and 3, and the two valve bodies 3 and 3 are integrated (see FIGS. 1 and 5). The inner diameters of the inflow port 4 and the outflow port 5 and the inner diameter of the gangway 7 are formed to be substantially the same and have the same axis.

Further, as shown in FIG. 4, the valve body 3 is inclined at a required angle θ in the valve closing direction (arrow direction in FIG. 3) with respect to the axis o of the valve box 1 with its axis center (elliptical cone center line) c tilted. It is attached to the valve rod 2 (the central axis c is eccentric from the axis a of the valve rod 2 in the valve closing direction). Similarly, the axial center (center line) c of the elliptical conical surface of the valve box valve seat 1a is also tilted by the required angle θ, and when the valve is closed, the axial center c of the valve body 3 (valve valve seat 3a) and the valve box The axes of the valve seat 1a are almost the same.

Further, valve body valve seats 3a and 3a are integrally formed on both valve bodies 3 and 3, and the valve body valve seat 3a is continuous from the ellipsoidal spherical surface of the valve body 3 without a step, and the flow of the valve box 1 Valve box valve seats 1a and 1a with which the valve body valve seat 3a abuts are formed on the inlet 4 side and the outlet 5 side. The valve box valve seat 1a is formed by a metal seat ring 8. For this reason, both valve seats 1a and 3a with metal seals are provided symmetrically to the left and right with respect to the axial center a of the valve stem 2.

As described above, in this eccentric rotary valve V, the valve box valve seat 1a has an elliptical conical surface, and the valve body valve seat 3a which forms a part of the surface of the valve body 3 of the elliptical conical sphere and is continuous without a step is also an elliptical conical surface. The sealing surface (part) is in perfect contact (sealing) between the elliptical conical surfaces.

At this time, as described above, when the axis c of the valve seats 1a and 3a is tilted by the required angle θ with respect to the valve box axis o, the axis c of the valve seats 1a and 3a is on the valve box axis o. It will not be located.
By appropriately selecting the required angle θ, the contact surface between the valve box valve seat 1a and the valve body valve seat 3a can be made a perfect circle in the direction orthogonal to the axial center o of the valve box 1 ( The valve holes 4a and 5a can be made into a perfect circle).

A straightening vane 10 in the flow direction of the gangway 7 is provided between the valve bodies 3 and 3. The number, thickness, and spacing of the straightening vanes 10 are appropriately set by experiments or the like so as not to interfere with distribution. If the straightening vane 10 is provided, the flow through the through-passage (inside the valve box 1) 7 becomes smooth and the flow rate control characteristics can be improved.
Further, in the valve closed state (state in FIG. 2), both valve rod mounting portions 1b and 1b (see FIGS. 1 and 5) on the front side in the valve opening direction (arrow direction in the same figure) of both valve bodies 3 and 3 are extended. The ridges 11 close to the valve box valve seat 1a are provided on the left and right sides of the valve stem 2, and grooves 12 in the valve box circumferential direction are formed on the surface of the ridges 11 (see FIG. 5).
Therefore, at the time of valve opening shown in FIGS. 2 to 3 (in the direction of the arrow in FIG. 2), the front side of the valve body 3 in the valve opening direction is close to the valve box valve seat 1a (FIG. 3), and distribution is performed in this groove 12. Since it hinders, the fluid w flowing from the inflow port 4 around the valve body 3 to the outflow port 5 side can be suppressed as much as possible, and a large amount of fluid can flow smoothly through the gangway 7.
The number, width, and spacing of the grooves 12 are appropriately set by experiments or the like so as to perform the action of smoothly blocking the distribution.

The eccentric rotary valve V of this embodiment has the above configuration, and the valve stem 2 is rotated to open and close the valve seat 1a and the valve seat 3a in contact with each other.
At the time of this opening and closing, as shown in FIGS. 1 and 2, in the valve closed state in which the valve bodies 3 and 3 close the valve holes 4a and 5a, as shown by the arrow in FIG. 2, the valve body 3 is formed by the valve rod 2. When 3 is rotated, the valve body 3 is attached to the valve rod 2 with its axial center (elliptical cone center line) c tilted (eccentrically) by a required angle θ in the valve closing direction with respect to the axial center o of the valve box 1. Since all the surfaces of the valve body valve seat 3a in the rotational direction are shorter (closer) than the valve stem center a than the length L that is farthest from the valve stem center a and is in contact with the valve box valve seat 1a. The contact surfaces of the valve body valve seat 3a and the valve box valve seat 1a are instantly separated (see FIG. 4).
Therefore, since the sealing surfaces of the valve body valve seat 3a and the valve box valve seat 1a do not slide with each other, it is not necessary to lift the valve body 3 once, and the valve body 3 (valve seats 3a, 1a) is extremely worn.

If the valve rod 2 continues to rotate in the valve opening direction, as shown in FIG. 3, the valve opening state is such that the axial center (central axis) of the gangway 7 and the central axis o of the valve box 1 coincide with each other. This state is appropriately controlled by a stopper of the handle that prevents the valve rod 2 from rotating, rotation control, or the like.
At the time of opening the valve, the flow in the through-passage 7 is rectified by the rectifying plate 10, and the fluid (leakage) w flowing from the inflow port 4 through the valve body 3 to the outflow port 5 side by the ridge 11 and the groove 12. Is suppressed as much as possible. Therefore, a large amount of fluid w can be smoothly flowed through the gangway 7.

The straightening vane 10 was a long plate long in the axial direction a of the valve stem 2, but as shown in FIG. 6, it can be a long plate orthogonal to the axial direction a of the valve stem 2. The cross section of the long plate is also not straight,
It is optional as long as it does not interfere with distribution such as bellows.
Further, in this embodiment, the surface shape of the valve body 3 is an elliptical spherical surface, but even if it is an elliptical cone surface or a perfect sphere, as long as the effect of the present invention is exhibited, the same applies. , The valve body valve seat 3a and the valve box valve seat 1a are made into elliptical spherical surfaces, the valve body valve seat 3a is made into an elliptical spherical surface, the valve box valve seat 1a is made into an elliptical cone surface, and the valve body valve seat 3a and the valve box valve are made. The seat 1a and the elliptical cone surface can be formed as each other. In addition, it goes without saying that various fluids such as water and gas, and special fluids such as those containing fine particles and highly viscous fluids can be applied to the fluid w.
Further, in the embodiment, in FIG. 2, the left side opening of the valve box 1 is the inflow port 4 and the right side opening is the outflow port 5, but the left side opening is the outflow port 5 and the right side opening is the inflow port 4. You can also do it.
Thus, it should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of claims and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 Valve box 1a Valve box valve seat 1b Valve rod mounting part 2 Valve rod 3 Valve body 3a Valve body valve seat 4 Valve box inlet (outlet)
4a Inflow port (outlet) side valve hole 5 Same valve box outflow port (inflow port)
5a Outlet (inlet) side valve hole 7 Through passage 10 Rectifying plate 11 Protrusion 12 Groove a Valve rod axis c Valve seat axis (center line)
o Axis of valve box (center line, cylinder axis)
θ Valve seat tilt angle V Eccentric rotary valve (plug valve)

Claims (6)

A tubular valve box (1) through which the fluid (w) flows, a valve rod (2) inserted in the valve box (1), and a valve rod (2) at its axis (a). On the other hand, a pair of valve bodies (3, 3) provided on the left and right sides of point symmetry, and an inlet (4) and an outlet of a valve box (1) formed between the two valve bodies (3, 3). A through-passage (7) communicating with (5) is provided, and valve box valve seats (1a, 1a) are provided in the valve box (1) on the inlet (4) and outlet (5) sides thereof, respectively. At the same time, in the eccentric rotary valve (V) provided with the valve body valve seats (3a, 3a) in contact with the valve box valve seats (1a, 1a) on both valve bodies (3, 3), respectively.
The surface shape of the valve body (3) is an elliptical spherical surface, an elliptical conical surface, or a true spherical surface, and the valve body valve seat (3a) and the valve box valve seat (1a) have a metal seal structure between elliptical spherical surfaces. , The valve body valve seat (3a) is continuous from the surface of the valve body (3) without a step, and the central axis (c) of both valve seats (3a, 1a) is the axis of the valve rod (2). Eccentric rotary valves eccentric from the center (a) in the valve closing direction. A tubular valve box (1) through which the fluid (w) flows, a valve rod (2) inserted in the valve box (1), and a valve rod (2) at its axis (a). On the other hand, a pair of valve bodies (3, 3) provided on the left and right sides of point symmetry, and an inlet (4) and an outlet of a valve box (1) formed between the two valve bodies (3, 3). A through-passage (7) communicating with (5) is provided, and valve box valve seats (1a, 1a) are provided in the valve box (1) on the inlet (4) and outlet (5) sides thereof, respectively. At the same time, in the eccentric rotary valve (V) provided with the valve body valve seats (3a, 3a) in contact with the valve box valve seats (1a, 1a) on both valve bodies (3, 3), respectively.
The surface shape of the valve body (3) is an elliptical spherical surface, an elliptical conical surface or a true spherical surface, the valve body valve seat (3a) is an elliptical spherical surface, and the valve box valve seat (1a) is an elliptical conical surface. The seats (3a, 1a) have a metal seal structure, the valve body valve seat (3a) is continuous from the surface of the valve body (3) without a step, and the center of both valve seats (3a, 1a). An eccentric rotary valve whose shaft (c) is eccentric from the axis (a) of the valve rod (2) in the valve closing direction. A tubular valve box (1) through which the fluid (w) flows, a valve rod (2) inserted in the valve box (1), and a valve rod (2) at its axis (a). On the other hand, a pair of valve bodies (3, 3) provided on the left and right sides of point symmetry, and an inlet (4) and an outlet of a valve box (1) formed between the two valve bodies (3, 3). A through-passage (7) communicating with (5) is provided, and valve box valve seats (1a, 1a) are provided in the valve box (1) on the inlet (4) and outlet (5) sides thereof, respectively. At the same time, in the eccentric rotary valve (V) provided with the valve body valve seats (3a, 3a) in contact with the valve box valve seats (1a, 1a) on both valve bodies (3, 3), respectively.
The surface shape of the valve body (3) is an elliptical spherical surface, and the valve body valve seat (3a) and the valve box valve seat (1a) have a metal seal structure between elliptical conical surfaces, and the valve body valve seat. (3a) is continuous from the surface of the valve body (3) without a step, and the central axis (c) of both valve seats (3a, 1a) is closed from the axis (a) of the valve rod (2). Eccentric rotary valves that are eccentric in the valve direction. The eccentric rotary valve according to any one of claims 1 to 3, wherein a rectifying plate (10) in the flow direction of the gangway (7) is provided between the two valve bodies (3, 3). In the closed state, the protrusions close to the valve box valve seat (1a) over the valve rod mounting portions (1b, 1b) on the front side in the valve opening direction of both valve bodies (3, 3). (11) is provided on the left and right sides of the valve rod (2), and a groove (12) in the circumferential direction of the valve box (1) is formed on the surface of the ridge (11) thereof, according to any one of claims 1 to 4. The eccentric rotary valve described. The required angle (θ) of the central axis (c) of the elliptical spherical surface or elliptical conical surface of the valve box valve seat (1a) and the valve body valve seat (3a) with respect to the axial center (o) of the valve box (1). Tilt to close the contact surfaces of the valve box valve seat (1a) and the valve body valve seat (3a) in a perfect circle in the direction orthogonal to the axis (o) of the valve box (1). The eccentric rotary valve according to any one of claims 1 to 5 as described above.

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