Extendable yoke and control valve

Abstract

To provide a yoke with an extendable function which enables extension / contraction adjustment at a work site etc., and to provide a gate valve.SOLUTION: In a yoke 2 with an extendable function, a speed reducer 8 which transmits rotational force of an operation part 9 to valve stems 3, 4 is provided at an upper part. The yoke 2 includes: a yoke body 6 which includes an outer cylinder 6b, and an inner cylinder 6a fitted in the outer cylinder 6b and houses the valve stems 3, 4; and an extension / contraction adjustment mechanism 7 which connects the inner cylinder 6a with the outer cylinder 6b in a manner that allows these cylinders to move relative to each other to enable extension / contraction adjustment in an axis O direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a yoke with a telescopic function and a water control valve. [Background Art]

[0002] Conventionally, for a water control valve installed on a buried pipe, the height of the operating handle is determined at the preliminary design stage. However, for water control valves on buried pipes, it is prone to slight errors (height difference) depending on the pipe installation site, making it difficult to achieve an optimal driving height. Therefore, after the pipe is installed, construction work such as cutting or extending the support column, valve stem, and the like is required depending on the site conditions. In order to solve these problems, a yoke with a height adjustment function that allows the height of the operating handle to be adjusted on site is known (for example, Patent Document 1). The yoke of Patent Document 1 expands and contracts the yoke body by rotating the outer cylinder of the yoke body relative to the inner cylinder, thereby adjusting the height of the operating handle. [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Utility Model Publication No. 4-42619 [Summary of Invention] [Problem to be Solved by the Invention]

[0004] Here, for example, there are cases where a speed reducer that reduces the rotational speed of an operating unit (key cap) is attached to the upper part of the yoke body. In other words, there are cases where when the operating unit is rotated, the rotational force is transmitted to the valve stem via the speed reducer to open and close the valve element. Providing the speed reducer enables fine opening and closing control of the valve element. Therefore, for example, when a speed reducer is attached to the configuration of Patent Document 1, since the gear of the speed reducer meshes with the valve stem, the yoke body cannot be rotated. As a result, in this configuration, there is a problem that expansion and contraction adjustment cannot be performed.

[0005] In light of these challenges, the present invention aims to provide a yoke with an extendable function and a water control valve that can be adjusted for extension and retraction on-site. [Means for solving the problem]

[0006] To achieve the above objective, the present invention is a telescopic yoke with a reduction gear provided at the top, comprising a yoke body that houses a valve stem and includes an outer cylinder and an inner cylinder fitted inside the outer cylinder, and an extension adjustment mechanism that allows extension and retraction adjustment by connecting the inner cylinder and the outer cylinder so that they can move relative to each other in the axial direction.

[0007] According to the present invention, since the outer cylinder and inner cylinder are movable in the axial direction by an extension and contraction adjustment mechanism, the yoke body can be extended and contracted without rotating the yoke body. This makes it possible to extend and contract the yoke body even with the reduction gear attached to the upper part of the yoke body.

[0008] Furthermore, it is preferable that the extension and retraction adjustment mechanism includes an adjustment rod inserted through the inner cylinder and the outer cylinder and provided parallel to the axial direction, and an adjustment nut fastened to the adjustment rod to determine the height position.

[0009] According to the present invention, an extension and retraction adjustment mechanism can be constructed with a simple configuration.

[0010] Furthermore, it is preferable that the valve stem comprises a first valve stem disposed on the lower side and a second valve stem disposed on the upper side, and that the second valve stem is connected to the first valve stem so as to be axially movable in conjunction with the expansion and contraction of the yoke body, and that the first valve stem and the second valve stem are further connected to a cylindrical joint that rotates them synchronously around an axis.

[0011] According to the present invention, even if the valve stem is composed of two members, it is possible to adjust its expansion and contraction.

[0012] Furthermore, it is preferable that a groove extending in the axial direction is formed on the outer circumferential surface of one of the inner and outer cylinders, and a through hole passing through in the radial direction is formed in the other of the inner and outer cylinders, and that the rotation of the inner and outer cylinders is restricted by fitting an expandable key into the groove and the through hole.

[0013] According to the present invention, the rotation of the inner cylinder and the outer cylinder relative to each other can be restricted.

[0014] Furthermore, the present invention is characterized by comprising a yoke with an expandable / contractible function as described in any one of claims 1 to 4, a valve body provided below the yoke with an expandable / contractible function, and a valve body connected to the valve stem for opening and closing the flow path within the valve body. [Effects of the Invention]

[0015] The present invention provides an expandable yoke and water control valve that can be adjusted for expansion and contraction on-site. [Brief explanation of the drawing]

[0016] [Figure 1] A side view showing a water control valve using an expandable yoke according to an embodiment of the present invention. [Figure 2] This is a front view showing a water control valve using an expandable yoke according to an embodiment of the present invention. [Figure 3] This is an enlarged side view of an expandable yoke according to an embodiment of the present invention. [Figure 4] This is a side view showing the second valve stem. [Figure 5] This is a cross-sectional view of the second valve stem. [Figure 6] This is a side cross-sectional view showing a cylindrical joint. [Figure 7] This is a plan view showing a cylindrical joint. [Figure 8] This is a side cross-sectional view showing the inner cylinder. [Figure 9] This is a side cross-sectional view showing the outer cylinder. [Figure 10] This is a magnified view showing the area around the through-hole in the outer cylinder. [Figure 11] (a) is a side view showing the telescopic key, and (b) is a front view showing the telescopic key. Mode for Carrying Out the Invention

[0017] Hereinafter, embodiments of the yoke with a telescopic function and the water control valve including the yoke with a telescopic function according to the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and repeated descriptions are appropriately omitted.

[0018] As shown in Figures 1 and 2, the water control valve V includes a valve body 1, a valve disc 1a, a yoke 2 with a telescopic function, a first valve stem 3, a second valve stem 4, a speed reducer 8, and an operating part 9. The water control valve V of the present embodiment is provided in a fluid pipe (not shown) buried underground, and controls the flow rate of water in the pipe. The yoke 2 with a telescopic function is provided on the upper part of the valve body 1 via a connecting pipe T, and the height can be adjusted by telescopically adjusting the yoke 2 with a telescopic function. The length of the connecting pipe T may be appropriately set according to the height of the water control valve V, and may be omitted.

[0019] The valve body 1 has a cylindrical shape, and rotatably accommodates the valve disc 1a therein. The valve disc 1a has a circular shape in front view and is rotatable around the axis O. In the present embodiment, the valve disc 1a is a butterfly valve, but may be of another form (for example, a gate valve in which the valve disc is movable in the vertical direction). The description of the yoke 2 with a telescopic function will be given in detail later.

[0020] As shown in Figure 3, the first valve stem 3 is a rod-shaped member whose lower end is connected to the valve disc 1a and whose upper end is connected to a cylindrical joint 5 described later. The first valve stem 3 includes an upper rod part 31 and a valve stem main body part 32. The upper rod part 31 has a cylindrical shape and is inserted into the cylindrical joint 5 described later. A key 31a is formed on the upper rod part 31, which is formed along the axial direction and protrudes outward from the center.

[0021] As shown in Figures 3-5, the second valve stem 4 is a rod-shaped member whose lower end is connected to a cylindrical joint 5 (described later) and whose upper end is connected to a reduction gear 8. The second valve stem 4 is separate from the first valve stem 3 and is positioned vertically apart from the first valve stem 3. As shown in Figure 4, the second valve stem 4 comprises an upper rod portion 41, a projection portion 42, a valve stem body portion 43, and a lower rod portion 44.

[0022] The upper rod portion 41 is cylindrical and is the part connected to the reduction gear 8. The upper rod portion 41 has a key 41a formed along the axial direction, which protrudes outward from the center. The key 41a engages with the output shaft of the reduction gear 8, thereby transmitting the rotational force of the operating portion 9 to the second valve stem 4 via the reduction gear 8.

[0023] As shown in Figure 4, a cylindrical valve stem body portion 43 is formed on the lower side of the upper rod portion 41, and a projection 42 that protrudes laterally is formed on the upper part of the valve stem body portion 43. The projection 42 is the part that engages with the inner wall 64a of the inner cylinder 6a, which will be described later. A lower rod portion 44 is formed on the lower side of the valve stem body portion 43. A key 44a is formed on the lower rod portion 44, which is formed along the axial direction and protrudes outward in a convex manner.

[0024] As shown in Figure 3, the reducer 8 is a device that reduces the rotational speed of the operating unit 9 and transmits it to the second valve stem 4. In this embodiment, the reducer 8 has a planetary gear structure and is configured to reduce the rotational speed (speed reduction) so that when the operating unit 9 is rotated once, the valve body 1a rotates 1 / n times. The operating unit 9 is the part into which a valve opener (not shown) is fitted, and has a prismatic shape. A gear (sun gear) provided at the lower end of the operating unit 9 meshes with the planetary gear of the reducer 8.

[0025] As shown in Figure 3, the telescopic yoke 2 comprises a cylindrical joint 5, a yoke body 6, an extension adjustment mechanism 7, and an extension key 10. The cylindrical joint 5 is a cylindrical member disposed inside the yoke body 6. The cylindrical joint 5 rotates the first valve stem 3 and the second valve stem 4 synchronously around the axis O, and also allows axial movement of the second valve stem 4 relative to the first valve stem 3.

[0026] As shown in Figure 6, the cylindrical joint 5 comprises a main body 51, a hollow portion 52, a second valve stem insertion portion 53, and a first valve stem insertion portion 54. As shown in Figures 3 and 6, the main body 51 has a cylindrical shape and includes a hollow portion 52 inside. The inner diameter of the hollow portion 52 is larger than that of the second valve stem insertion portion 53 and the first valve stem insertion portion 54. The hollow portion 52 is the space in which the second valve stem 4 moves in the axial direction. The second valve stem insertion portion 53 is formed in the upper part of the hollow portion 52, and the first valve stem insertion portion 54 is formed in the lower part of the hollow portion 52.

[0027] The second valve stem insertion portion 53 is the part into which the second valve stem 4 is inserted. As shown in Figure 7, a keyway 53a extending in the axial direction is formed in the second valve stem insertion portion 53. The keyway 53a is rectangular in cross-sectional view and has a concave shape extending outward from the center of the second valve stem insertion portion 53. The keyway 53a is the part into which the key 44a of the second valve stem 4 engages. The engagement of the key 44a and the keyway 53a allows the second valve stem 4 and the cylindrical joint 5 to rotate synchronously around their axis, and also allows the second valve stem 4 to move axially relative to the cylindrical joint 5.

[0028] As shown in Figure 6, the first valve stem insertion portion 54 is the part into which the first valve stem 3 is inserted. A keyway 54a extending in the axial direction is formed in the first valve stem insertion portion 54. The keyway 54a is rectangular in cross-sectional view and has a concave shape extending outward from the center of the first valve stem insertion portion 54. The keyway 54a is the part into which the key 31a of the first valve stem 3 engages. When the key 31a and the keyway 54a engage, the first valve stem 3 and the cylindrical joint 5 rotate synchronously around their axis.

[0029] As shown in Figure 3, the yoke body 6 comprises an outer cylinder 6b and an inner cylinder 6a fitted inside the outer cylinder 6b, and is a component that houses the first valve stem 3 and the second valve stem 4. The inner cylinder 6a and the outer cylinder 6b are connected so as to be movable in the axis O direction by an extension adjustment mechanism 7. In other words, the height of the yoke body 6 can be extended or retracted by adjusting the extension adjustment mechanism 7.

[0030] As shown in Figure 8, the inner cylinder 6a comprises an inner cylinder body portion 61a, an inner cylinder projection portion 62a, an inner cylinder keyway 63a, an inner wall 64a, and an opening 65a. The inner cylinder body portion 61a is a cylindrical member. The inner cylinder projection portion 62a is formed on the upper part of the inner cylinder body portion 61a along the circumferential direction and protrudes laterally. The inner cylinder keyway 63a is a groove that extends axially on the outer circumferential surface of the lower part of the inner cylinder body portion 61a. Two inner cylinder keyways 63a are formed, one on the opposite side at 180 degrees. An inner wall 64a with an opening 65a is formed on the upper part of the inner cylinder body portion 61a. As shown in Figure 3, the projection portion 42 of the second valve stem 4 has a larger diameter than the opening 65a of the inner wall 64a. As a result, the height position of the second valve stem 4 is restricted by the inner wall 64a, and the portion below the projection 42 is inserted into the inner cylinder 6a.

[0031] As shown in Figure 9, the outer cylinder 6b comprises a cylindrical outer cylinder body portion 61b, an outer cylinder projection portion 62b projecting laterally from the upper part of the outer cylinder body portion 61b, and through holes 63b on the surface of the outer cylinder body portion 61b that penetrate to the inside and outside of the outer cylinder body portion 61b. Two through holes 63b are formed on the outer circumference of the outer cylinder body portion 61b and are positioned corresponding to the inner cylinder keyway 63a shown in Figure 8. The through holes 63b are approximately rectangular in side view. The width (lateral width) of the through holes 63b is the same as the width (lateral width) of the inner cylinder keyway 63a.

[0032] As shown in Figure 3, the telescopic adjustment mechanism 7 comprises an adjustment rod 7a and adjustment nuts B1 and B2. Four telescopic adjustment mechanisms 7 are arranged at equal intervals along the circumferential direction. The adjustment rod 7a is inserted through the inner cylinder projection 62a and the outer cylinder projection 62b and is arranged parallel to the axis O direction. The adjustment rod 7a is made of, for example, steel and is sufficiently longer than the maximum length of the telescopic adjustment.

[0033] The adjustment rod 7a is fastened to the yoke body 6 by adjustment nuts B1 and B2. The upper part of the adjustment rod 7a is fastened with adjustment nuts B1 and B1, sandwiching the inner cylinder projection 62a. The lower part of the adjustment rod 7a is fastened with adjustment nuts B2 and B2, sandwiching the outer cylinder projection 62b. When extending or retracting the yoke body 6, for example, the height can be adjusted by loosening the adjustment nuts B2 and B2 to release the fastening and moving the inner cylinder 6a up or down relative to the outer cylinder 6b.

[0034] Figure 10 is an enlarged view showing the area around the through hole 63b of the outer cylinder 6b. The through hole 63b is located in a position corresponding to the inner cylinder keyway 63a. In other words, when viewed from the side, the inner cylinder keyway 63a and the through hole 63b are arranged to overlap, and the retractable key 10 is fitted into the inner cylinder keyway 63a and the through hole 63b, thereby restricting the rotation of the inner cylinder 6a (see Figure 3) and the outer cylinder 6b relative to each other. The retractable key 10 is composed of wedge members 10A and 10B of the same shape.

[0035] As shown in Figures 11(a) and (b), the wedge member 10A (10B) comprises an inclined portion 101, a straight portion 102 opposite to the inclined portion 101, an upper portion 103 extending vertically from the upper part of the inclined portion 101 toward the straight portion 102, an upper inclined portion 104 inclined from the upper portion 103 toward the straight portion 102, a lower portion 105 extending vertically from the lower part of the inclined portion 101 toward the straight portion 102, and a lower inclined portion 106 inclined from the lower portion 105 toward the straight portion 102. The length of the wedge member 10A (10B) in the depth direction is approximately the same as the sum of the lengths of the through hole 63b and the inner cylinder keyway 63a in the depth direction.

[0036] As shown in Figures 10 and 11(a) and (b), the wedge member 10A (10B) has a roughly triangular shape when viewed from the side and a roughly rectangular shape when viewed from the front. The telescopic key 10 is used as a pair by overlapping the inclined portions 101 of the wedge members 10A and 10B while inverting their top and bottom.

[0037] As shown by the dashed line in Figure 10, when the wedge members 10A and 10B are significantly misaligned with each other, the telescopic key 10 is in a free state (non-functional). On the other hand, for example, the wedge member 10B can be struck with a hammer to tighten the telescopic key 10 against the through hole 63b and the inner cylinder keyway 63a. Since the wedge members 10A and 10B each have inclined portions 101 formed on them, they can slide against each other and tighten. This allows the telescopic key 10 to restrict the relative rotation of the inner cylinder 6a and the outer cylinder 6b. As shown in Figure 2, a cover member L may be attached to cover the through hole 63b.

[0038] As described above, with the telescopic yoke 2 of this embodiment, the inner cylinder 6a and the outer cylinder 6b are movable in the axis O direction by the telescopic adjustment mechanism 7, so that the yoke body 6 can be extended and retracted without rotating the yoke body 6. This makes it possible to easily extend and retract the yoke body 6 even when the reduction gear 8 is attached to the upper part of the yoke body 6.

[0039] Furthermore, since the telescopic adjustment mechanism 7 includes an adjustment rod 7a that is inserted through the inner cylinder projection 62a of the inner cylinder 6a and the outer cylinder projection 62b of the outer cylinder 6b and is provided parallel to the axial direction, and adjustment nuts B1 and B2 that are fastened to the adjustment rod 7a to determine the height position, the telescopic adjustment mechanism 7 can be constructed with a simple structure. In other words, the telescopic adjustment can be easily performed by fastening or loosening the adjustment nuts B1 and B2.

[0040] Furthermore, the valve stem comprises a first valve stem 3 disposed on the lower side and a second valve stem 4 disposed on the upper side, and the second valve stem 4 is connected to the first valve stem 3 so as to be movable in the axial direction in conjunction with the expansion and contraction of the yoke body 6. In addition, since there is a cylindrical joint 5 that rotates the first valve stem 3 and the second valve stem 4 synchronously around the axis by the engagement of keys 31a, 44a and key grooves 53a, 54a, expansion and contraction adjustment is possible even though the valve stem is composed of two members.

[0041] Here, the outer cylinder 6b and the inner cylinder 6a are fastened together by adjustment nuts B1 and B2 in the telescopic adjustment mechanism 7, but there is a risk of play in the circumferential and height directions due to machining errors in the outer cylinder 6b and the inner cylinder 6a and dimensional errors due to the thickness of the powder coating. In contrast, according to this embodiment, the telescopic key 10 is fitted into the inner cylinder keyway 63a and the through hole 63b, thereby suppressing play in the inner cylinder 6a and the outer cylinder 6b, and in particular, restricting the rotation of the inner cylinder 6a and the outer cylinder 6b relative to each other.

[0042] The embodiments of the present invention have been described above. The present invention is not limited to the embodiments described above, and each component can be modified as appropriate without departing from the spirit of the invention. For example, in this embodiment, a key 44a is provided on the second valve stem 4 and a keyway 53a is provided on the cylinder joint 5, but a keyway may be provided on the second valve stem 4 and a key on the cylinder joint. In addition, the key and keyway may be provided on opposite sides in other parts as well. Furthermore, although this embodiment describes a form in which the valve stem consists of two members, the present invention can also be applied to cases in which the valve stem is composed of a single member, such as in a gate valve. [Explanation of Symbols]

[0043] 1. Valve box 1a Valve body 2. Stretchable yoke 3 First valve stem (valve stem) 4 Second valve stem (valve stem) 5. Pipe fittings 6. Yoke body 6a Inner cylinder 6b Outer cylinder 7 Telescopic adjustment mechanism 8 Reducer 9 Control section 10 retractable keys V water control valve

Claims

1. A yoke with an extendable function and a reduction gear installed at the top, A yoke body comprising an outer cylinder and an inner cylinder fitted inside the outer cylinder, which houses a valve stem, It has an extension adjustment mechanism that allows extension and contraction adjustment by connecting the inner cylinder and the outer cylinder so that they can move relative to each other in the axial direction, The extension and retraction adjustment mechanism is characterized by comprising an adjustment rod inserted through the inner cylinder and the outer cylinder and provided parallel to the axial direction, and an adjustment nut fastened to the adjustment rod to determine the height position, thus providing an extension and retraction function for yokes.

2. A yoke with an extendable function and a reduction gear installed at the top, A yoke body comprising an outer cylinder and an inner cylinder fitted inside the outer cylinder, which houses a valve stem, It has an extension adjustment mechanism that allows extension and contraction adjustment by connecting the inner cylinder and the outer cylinder so that they can move relative to each other in the axial direction, A groove extending in the axial direction is formed on the outer circumferential surface of one of the inner and outer cylinders. The inner cylinder and the other outer cylinder have through holes that penetrate radially. A yoke with an expandable / contractable function, characterized in that the rotation of the inner cylinder and the outer cylinder is restricted by fitting an expandable / contractable key into the groove and the through hole.

3. The valve stem comprises a first valve stem disposed on the lower side and a second valve stem disposed on the upper side. The expandable yoke according to claim 1 or 2, further comprising a cylindrical joint that connects the second valve stem to the first valve stem so as to be movable in the axial direction in conjunction with the expansion and contraction of the yoke body, and rotates the first valve stem and the second valve stem synchronously around an axis.

4. A yoke with an expandable function according to claim 1 or 2, A valve box provided below the aforementioned expandable yoke, A water control valve characterized by comprising a valve body connected to the valve stem and for opening and closing a flow path within the valve body.

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