JP5920719B2 - Manufacturing method of butterfly valve with water filling function - Google Patents

Description

The present invention relates to a method for manufacturing a butterfly valve with a charging function for supplying a fluid when charging a pipe such as a water pipe.

When a new pipe is installed, inspected, renewed, etc., when it is fully filled with rapid filling, the air in the pipe is appropriately removed from the air valve installed in the downstream pipe. In some cases, the safety valve may be damaged or the piping itself may be damaged by extrusion (compression) of the water hammer or the air in the piping. For this reason, a butterfly valve is interposed in the middle of the pipe, and the butterfly valve is opened to a small opening so that the downstream pipe (pipe) is filled with a small flow rate.
The general butterfly valve includes a valve shaft that penetrates the valve box in the radial direction and a valve body that has the valve shaft attached in the central radial direction, and the leading edge of the valve body is in contact with the inner peripheral surface of the valve box. A rubber valve box valve seat is formed, and the valve is opened and closed by rotating the valve body via the valve shaft.

It is difficult to control the flow rate at the small opening by the general butterfly valve. For this reason, a tail portion extending in the valve closing direction (direction in which the valve body rotates when the valve is closed) is provided at the valve body tip edge, and a water passage hole is formed in the tail portion. There is one that can smoothly fill the downstream pipe by allowing water to pass through and setting the opening area (flow area) of the water passage hole to a required value (Patent Document 1 claim). Item 1, see FIG.
In addition, an extension part is provided on the valve-opening side of the valve-box valve seat (the side in which the valve element rotates when the valve is opened), and the valve element tip edge slides, and a groove in the valve-opening direction is provided in the extension part. In the initial stage of valve opening, water is passed through the groove-shaped water passage hole so that the downstream side pipe is filled with water (Patent Document 2, Claim 1, (See FIG. 5).

JP 2006-234071 A JP 2012-82936 A

In the case where the valve body is provided with a tail portion, in order to keep the amount of water flow at the time of filling constant at a small flow rate, in order to perform almost all the water flow through the water flow hole of the tail portion, What is necessary is just to slide a valve-box valve seat and a tail part, but for that purpose, the exact formation of the tail part sliding surface (outer peripheral surface) for sliding with a valve-box valve seat is complicated, It is expensive. Further, the valve seat valve seat is a portion that needs to be elastically deformed by the pressure of the leading edge of the valve body when the pipe is fully closed, and deformation is allowed. Therefore, in order to obtain the constant small flow rate at the time of water filling corresponding to the deformation of the tail portion, it is necessary to bend (press) the sliding of the valve box valve seat, and the sliding resistance is reduced. The valve shaft rotational torque is large when the valve is large.
On the other hand, in the case where the grooved water passage hole is provided in the valve box extension part, the extension part is accurately designed to correspond to the tip end edge of the valve body. The problem of sliding resistance is also small between the extended parts, but the extended part that is integral with the valve box body is usually a casting, and its inner surface cannot be finished with high accuracy in a valve box with poor workability. It is difficult and very laborious and costly. If the accuracy is low, it may be difficult to control the amount of water flow, or the valve body and the extended portion based on the rough surface may be damaged.

  This invention makes it a subject to solve the said problem of the structure in the structure which formed the groove-shaped water flow hole in the valve box side under the above actual condition.

In order to achieve the above object, according to the present invention, the extending portion having the groove-shaped water passage hole is formed from a member different from the valve box body.
If the extending portion having the groove-shaped water passage hole is a separate member from the valve box body, the extending portion can be formed without being affected by the material and manufacturing accuracy of the valve box body. For this reason, it is possible to improve the processing accuracy such as the accuracy of the opening area of the groove-shaped water passage hole, the contact (sliding) between the distal end edge of the valve body and the inner peripheral surface of the extending portion, and the proximity. If the machining accuracy can be improved, the sliding resistance can be reduced, so that the valve shaft rotation torque at the time of the on-off valve can be reduced, and the flow rate can be easily controlled, so that the valve body and the extension part There is less risk of damage.

As a specific configuration of the present invention, a valve shaft that penetrates the valve box in the radial direction, and a valve body that has the valve shaft attached in the central radial direction, the valve body is rotated through the valve shaft. In the butterfly valve that opens and closes the valve, a flow rate adjusting member consisting of a separate member from the valve body is provided in the valve box inner peripheral surface continuously in the valve opening direction of the valve body of the rubber valve seat of the valve box, The inner surface of the flow rate adjusting member is formed as an arc surface corresponding to the movement of the peripheral edge of the valve body, and a groove-shaped water passage hole in the valve opening direction of the valve body is formed around the arc surface. In the initial stage of the valve, the valve body tip edge corresponds to the arc surface of the flow rate adjustment member, and the water flow is the groove-like water passage hole or the groove-like water passage hole and the arc surface of the flow rate adjustment member and the valve body tip edge. The structure which distribute | circulates between can be employ | adopted.

  In this configuration, the rotational torque of the valve body can be made small if the peripheral edge of the valve body is moved in sliding contact with or close to the arc surface of the flow rate adjusting member. The “sliding contact” means “a contact state in which water does not flow through between the circular arc surface of the flow rate adjusting member and the valve body tip edge”, and “adjacent” means “a grooved water passage hole”. "The state of approaching with a gap between the distal end periphery of the valve body and the arc surface of the flow rate adjusting member to the extent that does not hinder the water flow control by".

Further, if the flow rate adjusting member is formed integrally with the valve box valve seat and rubber, the flow rate adjusting member can be provided at the same time as the formation of the required valve box valve seat. Usually, the lining (integral molding) with rubber can be performed directly by vulcanization in a valve box using a mold, so that the design (finishing) accuracy can be high.
Furthermore, if a tail portion extending in the valve closing direction is provided at the valve body tip edge, and the outer peripheral surface of the tail portion is along the rotation surface of the valve body tip edge, the valve body tip edge will have a flow rate adjusting member at the time of water filling. Even if it passes, it can be made to flow through the gap (or / and the water passage hole) between the tail part and the flow rate adjusting member, and a sudden increase in flow rate when the valve body tip edge passes the flow rate adjusting member is prevented. be able to. At this time, the outer peripheral surface of the tail portion is along the rotation surface of the valve body tip edge, and the tail portion is not in sliding contact with or close to the flow rate adjusting member and the valve case valve seat, but from the flow rate adjusting member and the valve case valve seat. If it is provided at the valve body tip edge so as to have a constant interval, it is not necessary to mold with an accurate shape, the problem of cost can be reduced, and the problem of sliding resistance does not occur.

  The present invention is configured as described above, and a groove-like water passage hole is formed on the inner surface of the valve box by using a separate member from the valve box main body in succession to the valve box valve seat, thereby reducing the manufacturing cost. In addition, the degree of sliding contact between the leading edge of the valve body and the inner peripheral surface of the flow rate adjusting member can be improved, and the rotational torque of the valve body can be reduced to perform smooth flow rate control.

The principal part notch cross-sectional perspective view of one Embodiment of the butterfly valve which concerns on this invention Right half cut side view omitting valve body portion and the like of the same embodiment The main part cutting plan view for effect explanation seen from the front of FIG. 1 of the embodiment The main part cutting schematic plan view for explaining the action as seen from the side surface of FIG. Other embodiment is shown, (a) is a principal part cutting top view, (b) is a fragmentary perspective view of a flow volume adjustment member. Other embodiment is shown, (a) is a principal part cutting top view, (b) is an effect | action figure. Other embodiment is shown, (a) is a perspective view, (b) is the bb sectional view taken on the line of (a).

  One embodiment of a butterfly valve V according to the present invention is shown in FIGS. 1 to 4, and this embodiment also has a valve box 1 and a valve shaft 2 that penetrates the valve box 1 in the radial direction, as in the prior art. The valve body 2 includes a valve body 3 attached in the central radial direction. The valve body 3 is opened and closed by rotating the valve body 3 forward and backward by about 90 degrees as shown by arrows in FIG. In the figure, the right rotation of the arrow is closed and the left rotation is opened.

The valve box 1 and the valve body 3 of the butterfly valve V are made of a metal such as cast steel, and a valve seat 4 made of rubber such as chloroprene rubber is formed around the center in the axial direction of the cylindrical main body 1a of the valve box 1. The valve seat sheet 11 is provided by vulcanization adhesion using a mold.
One side inner peripheral surface of the valve seat 11 is a spherical surface (cross-sectional arc surface 11a) in the valve opening direction in which the periphery of the center line c becomes a thick (convex) small diameter (valve valve seat 4), The other side inner peripheral surface is a cylindrical surface (see FIGS. 1 and 3), and the valve body 3 rotates in the closing direction to gradually bite into the valve box valve seat 4 and is preset on the center line c. It closes as the maximum bite.

Groove-shaped water passage holes 12 in the valve opening direction are formed in the spherical inner peripheral surface 11a of the valve seat 11 at a required interval in the circumferential direction continuously from the valve seat 4 (see FIG. 1). The positions, depths, widths, and intervals of the groove-shaped water passage holes 12 with respect to the valve seat 4 are appropriately set by experiments or the like so as not to hinder the water filling.
If the length direction (the left-right direction in FIG. 3) of the groove-shaped water passage hole 12 is the valve opening direction of the valve body 3, it may be inclined with respect to the cylinder axis of the valve box body 1a or may be arcuate. Although it is good, it is preferable to make it become the same direction as the rotation direction (arrow direction) of the valve body 3 as shown in FIG. Even if the valve body peripheral edge corresponding to each groove-shaped water passage hole 12 becomes the same, and the valve body 3 rotates, the flow area of the water flow hole 12 depends on the depth and width of the groove water-flow hole 12. This is because the amount of water charged (circulation amount) can be controlled only by the shape of the groove-shaped water passage hole 12.

This embodiment has the above-described configuration, and is interposed in a pipe such as a water pipe. When newly installed, renewed, inspected, at the initial water flow in the pipe, from the solid line state in FIGS. 3 and 4, as indicated by an arrow. When the valve body 3 is opened by a small opening to bring it into a chain line state, the water flow a is from one of the filled pipes (left side in FIG. 3) to the grooved water hole 12 or the grooved water hole 12 and the valve seat. It passes between the circular arc surface (inner surface) 11a of the seat 11 and the valve body tip edge and flows to the other pipe to fill the other pipe.
At this time, the peripheral edge (tip edge 3a) of the valve body 3 is moved from the inner peripheral surface of the valve seat 4 when reaching the small opening of the chain line from the closed state of the solid line in FIG. After the separation, the valve body 3 moves while being in sliding contact with or close to the inner peripheral surface 11a of the valve seat 11 which is substantially the same as the rotation path of the tip edge 3a of the valve body 3, and is unnecessary for the rotation of the valve shaft 2. Do not give dynamic (contact) torque. For this reason, the rotation of the valve body 3 is smooth. Here, since the inner peripheral surface 11a of the valve seat 11 is formed in a target shape on the assumption that it is not deformed, it is easy to achieve manufacturing accuracy.
In addition, if the periphery of the valve body 3 and the valve seat 11 are “sliding contact”, the water flow a passes only through the groove-shaped water passage hole 12, and if it is “close”, the groove-shaped water passage hole 12. And circulates between the valve body periphery and the valve seat 11.
When the other pipe is filled with water (filled), the valve shaft 2 is further rotated to fully open (open) the valve body 3.

In the above embodiment, the flow rate adjusting member (the portion having the groove-like water passage hole 12) is configured by the valve seat 11 having the valve seat 4, but as shown in FIG. It can also be constituted by a member different from the sheet 11 ′.
The flow rate adjusting member 13 is a semi-annular shape over the inner circumference of the valve box main body 1a made of an elastic body such as metal or rubber, and an appropriate position around the flow adjusting member 13 is secured to the valve box main body 1a by screws (bolts) 14. It is fixed. The flow rate adjusting member 13 is provided on each of the left and right sides (upstream and downstream sides) of the valve shaft 2, and groove-shaped water passage holes 12 are formed at predetermined intervals around the arcuate inner peripheral surface (partial spherical surface) 13a. ing. Further, in this embodiment, the valve seat 11 ′ is not directly vulcanized and bonded in the valve box 1 using a mold, and the molded product is made of adhesive-attached rubber to the valve box 1, The flow rate adjusting member 13 also has a function of fixing the valve seat 11 ′.

This embodiment is also provided in a pipe such as a water pipe, and the valve body 3 is opened as shown by an arrow from the solid line state in FIG. When the state is shown in a chain line, the water flow a flows from one filled pipe (on the left side in FIG. 5) through the grooved water passage hole 12 to the other pipe and fills the other pipe. .
At this time, the peripheral edge of the valve body 3 is close to the inner peripheral surface of the flow rate adjusting member 13 after being separated from the inner peripheral surface of the valve seat 4 when reaching the small opening of the chain line from the closed state of the solid line in FIG. Or it moves in the state of sliding contact and does not give unnecessary sliding (contact) torque to the rotation of the valve shaft 2. For this reason, the rotation of the valve body 3 is smooth.
Since the flow rate adjusting member 13 is a separate member, even when it is made of metal, its inner peripheral surface can be easily processed, and the accuracy can be easily obtained.

FIG. 6 shows still another embodiment. In this embodiment, a tail portion 20 extending in the valve closing direction is provided at the front end edge of the valve body 2 as in the technique described in Patent Document 1.
In this embodiment, in addition to water flow through the groove-shaped water passage hole 12 in the initial stage of valve opening, the valve body tip edge 3a is operated to a position past the extending portion (the inner peripheral surface 11a of the valve seat 11). Even in this state ((b) in the figure), the valve body tip edge 3a is provided on the inner periphery of the valve seat because it flows through the gaps between the water passage hole 12 and the tail portion 20 and the valve seat inner peripheral surface 11a. An abrupt increase in flow rate when passing through the surface 11a can be prevented.
For this purpose, the outer peripheral surface 20a of the tail portion 20 is a spherical surface along the rotation surface of the valve body tip edge 3a having a smaller diameter than the tip edge 3a of the valve body 3, and the inner peripheral surface of the valve seat 4 and the valve seat seat. Since it has a certain distance from the inner peripheral surface 11a, excessive machining accuracy is not required, and unnecessary sliding (contact) torque is not given to the rotation of the valve shaft 2. For this reason, the rotation of the valve body 3 is smooth. The distance between the outer peripheral surface 20a of the tail portion 20 and the valve seat inner peripheral surface 11a is appropriately set in consideration of the flow rate of the water flow a.
The tail portion 20 may be an integrally cast product with the valve body 3 as shown in the figure, or may be a fixed product by welding a separate object or screwing.

In each of the above embodiments, the groove-shaped water passage holes 12 are provided at a plurality of positions on the left and right front and rear (one side front and back in FIG. 2) with respect to the valve shaft 2. In FIG. 2, only the left side may be sufficient, and the formation length may be all or a part of the half circumference on either side or one side, or may be a single location. In short, it suffices if the water is smoothly charged by the water flow a. Further, the width and depth of the groove-shaped water passage hole 12 can be gradually expanded or deepened in the valve opening direction so that the flow area (flow amount) gradually increases as the valve body 3 rotates.
For example, in the embodiment of FIG. 5, the depth of the water passage hole 12 is gradually increased, and as shown in FIG. 7, one side of the valve seat sheet 11 in the middle of the length direction of the valve stem 2. In addition, a groove-shaped water passage hole 12 having a triangular shape in front view that gradually increases in width in the valve opening direction can be formed. The triangular water passage 12 can be gradually deepened in the valve opening direction, and can also be provided at a symmetrical position with respect to the valve shaft 2. Since the convex part of the valve seat 11 in the middle of the valve stem 2 is wide and the valve body 3 is the part that contacts the longest in terms of distance, the water passage hole 12 is formed in this part. This makes it easy to control the amount of water flow with respect to the degree of rotation of the valve body 3, and is advantageous for small amount flow control.

DESCRIPTION OF SYMBOLS 1 Valve box 1a Valve box main body 2 Valve shaft 3 Valve body 4 Valve box valve seat 11 Valve seat sheet 12 Groove-shaped water flow hole 13 Flow rate adjusting member 20 Tail part

Claims (1)

A valve shaft (1), a valve shaft (2) penetrating the valve box (1) in the radial direction, and a valve body (3) having the valve shaft (2) attached in the central radial direction, In the manufacturing method of the butterfly valve (V) that opens and closes by rotating the valve body (3) via (2),
A flow rate adjusting member comprising a separate member from the valve body (1a) in the valve opening direction of the valve body (3) of the rubber valve seat (4) of the valve box (1) The inner surface of the flow rate adjusting member is formed on a circular arc surface (11a) corresponding to the movement of the peripheral edge of the valve body (3), and the valve body is formed around the circular arc surface (11a). The groove-shaped water passage hole (12) in the valve opening direction of (3) is formed, and the flow rate adjusting member is formed by the rubber vulcanization adhesion in the valve box using a mold. molded integrally fixed to the valve body inner peripheral surface and the valve opening initial, valve body tip edge (3a) is in correspondence with the arcuate surface of the flow rate adjusting member (11a), passing water (a) is It distribute | circulates through between the said groove-shaped water flow hole (12) or its groove-shaped water flow hole (12), and the circular arc surface (11a) of the said flow volume adjustment member, and a valve body front end edge (3a). Method of manufacturing filled with water feature with a butterfly valve which is characterized.

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