JP2023098219A - Valve fixing structure and valve - Google Patents

Abstract

To provide a valve fixing structure and a valve, capable of connecting a body and a cap of a valve by using a common fixing bolt, being attached to a predetermined position only by fastening the fixing bolt, and precisely fixing the body and the cap through the bolt.SOLUTION: Female screws 26 are communicated at plural positions of an implanting side flange 25 on a body 21 side. A part of the female screws are extended and formed on a thick wall portion 30 provided on a side which the tip end 23a side of all screw bolts 23 of the implanting side flange faces. All screw bolts are screwed in the female screws to lock the tip end side thereof to the thick wall portion side to be positioned. A cap side flange 33 is butted on the implanting side flange. Nuts 24 are screwed with rear end side of all screw bolts projecting out from the cap side flange through through-holes 34 of the cap side flange, thereby connecting the implanting side flange and the cap side flange.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a fixing structure for a valve such as a ball valve, and more particularly to a fixing structure for a valve and a valve for connecting a separately provided body and cap.

Conventionally, in a valve such as a ball valve, a body and a cap are separately provided in order to accommodate a valve body such as a ball valve body in the valve. In some cases, the cap is connected to and integrated with the body.

As a ball valve of this type, for example, a ball valve is disclosed in Patent Document 1. In this ball valve, the body and cap are connected by fastening with a plurality of stud bolts and fixing nuts. Normally, in a ball valve having such a structure in which the body and cap are separated from each other, these are fixed to the stud bolts. It is often fixed by fastening with a mounting nut.

FIG. 5 shows a general fixing structure between the body and cap of the ball valve. The ball valve 1 has a body portion 2 and a cap portion 3. A flange portion 4 provided on the body portion 2 side and a flange portion 5 provided on the cap portion 3 side are connected by stud bolts (stud bolts). ) 6 and a fixing nut 7 .

The stud bolt 6 has an stud-side male threaded portion 8 on the mounting side to the body portion-side flange portion 4, a cylindrical portion 9 continuing to the stud-side male threaded portion 8, and a nut-side male threaded portion 10 continuing to the cylindrical portion 9. ing. The implant-side male threaded portion 8 is formed to be longer than the thickness of the body-side flange portion 4 . , the limit of tightening on the implant side is set at a locking portion 6a on the boundary between the male screw portion 8 and the cylindrical portion 9 on the implant side. The length of the nut-side male screw portion 10 is determined by tightening the fixing nut 7 from the outside of the cap-side flange portion 5 while the cap-side flange portion 5 is butted against the body-side flange portion 4 into which the stud 6 is screwed. It is provided with a length that can be screwed and tightened.

By using this stud bolt 6, the body portion 2 and the cap portion 3 are connected while the body portion side flange portion 4 and the cap portion side flange portion 5 are aligned. At the time of these connections, after the stud bolt 6 is implanted in the body part 2 side, the cap part 3 is temporarily assembled to the body part 2 through the stud bolt 6 while the valve body and the stem are mounted in the body part 2. Then, the fixing nut 7 is tightened onto the stud bolt 6 to integrate them in a predetermined assembled state.

On the other hand, when the body and cap of a valve other than a ball valve are flange-connected, or when pipe joints are flange-connected, the same structure as above is generally fixed using a stud bolt and a fixing nut. Are known.
Moreover, in order to flange-connect such piping parts, one tightening point is often fixed by a fully threaded bolt (slotted bolt) and two fixing nuts. In this case, a plurality of through-holes communicating with each other are provided in both flanges, and fully-threaded bolts are inserted through both of the through-holes while the flanges are abutted. It is designed to be fixed by tightening a fixing nut from each.

Japanese Utility Model Publication No. 63-26612

In the case of flange connection using a stud bolt and a fixing nut as in the ball valve of Patent Document 1, as shown in FIG. Since the stud bolt 6 is positioned by engaging with the opening side of the female screw portion 11 on the flange portion 4 side, the flange portion (body portion side flange portion 4, cap portion side flange portion 5) differs depending on the size and pressure class of the valve. It is necessary to properly use stud bolts 6 having different lengths for the stud-side male screw portion 8, the nut-side male screw portion 10, and the cylindrical portion 9, depending on the thickness of the screw. In this case, stud bolts 6 of various specifications must be prepared in advance, and if there is no suitable stud bolt 6, it may be necessary to process and install a new stud bolt. At this time, the implant-side male threaded portion 8, the nut-side male threaded portion 10, and the cylindrical portion 9 must be manufactured according to the dimensions of the flange portions 4 and 5 to be connected, and the processing thereof becomes troublesome.

On the other hand, when the parts that make up the valve are fixed together by a fully threaded bolt and two fixing nuts, the fully threaded bolt cannot be positioned on the flange by itself, and the fixing nuts on both sides cannot be tightened. Positioning is fixed by In this way, the position of the fully threaded bolts must be adjusted at the tightening points on both sides, and the fixing nuts must be tightened to connect the flanges. becomes difficult. If the fully threaded bolts are extremely misaligned, the flanges are connected with each other in a slanted state, resulting in an uneven sealing performance, and there is a possibility that the internal fluid may leak from the flange connecting surfaces.

SUMMARY OF THE INVENTION The present invention was developed to solve the problems of the prior art. To provide a fixing structure for a valve and a valve which can be mounted at a predetermined position only by tightening and can accurately fix a body and a cap through a bolt.

In order to achieve the above object, the invention according to claim 1 is a fixing structure for connecting a body and a cap of a valve, wherein a plurality of fully threaded bolts for implantation are attached to a plurality of locations on an implantation side flange provided on the body side. A female thread is formed in communication with the male thread of the implanted side flange, and a part of the female thread extends to the thick part provided near the base of the body on the side facing the tip side of the fully threaded bolt of this implanted side flange. A cap-side flange provided on the cap side is abutted against the planting-side flange in a state in which a full-thread bolt is screwed into the female thread and the tip end thereof is engaged with the thick-walled portion side and positioned. This is a valve fixing structure in which a nut is screwed on the rear end side of a fully threaded bolt protruding from the cap-side flange through a through hole formed in the cap-side flange to connect the planting-side flange and the cap-side flange.

The invention according to claim 2 is a valve fixing structure in which an incompletely threaded portion of a female thread is provided in the thick portion, and the distal end side of the male thread of the fully threaded bolt is engaged with this incompletely threaded portion.

The invention according to claim 3 is a valve fixing structure in which the thick portion is provided with a pawl portion protruding toward the inner diameter of the internal thread, and the tip end side of the fully threaded bolt abuts and is locked to the pawl portion. .

The invention according to claim 4 is a valve fixing structure in which the thick portion is provided in the vicinity of the base of the implanted-side flange with the body on the side facing the tip end side of the fully threaded bolt.

The invention according to claim 5 is a valve in which a body and a cap are connected by a valve fixing structure.

According to the first aspect of the invention, the body and cap of the valve can be connected using a common fully threaded bolt without using stud bolts with different specifications depending on the size and pressure class of the valve. At the time of connection, by tightening the fixing full-threaded bolt so that its tip end is locked in the thick part, this full-threaded bolt can be easily attached to the predetermined position, and in this state, it can be attached to the implanted side flange. The cap-side flanges are butted together, and a nut is screwed from the rear end of the fully-threaded bolt through the through-hole of the cap-side flange to connect the implant-side flange and the cap-side flange. The cap can be evenly tightened and accurately fixed. As a result, the flanges of the body and the cap can be connected to each other while preventing inclination, thereby improving sealing performance. Since the thick portion can be provided at the same time as molding such as casting, there is no need to process the thick portion separately, and it is possible to easily provide the thick portion by using surplus thickness during manufacturing. Since stud bolts of various specifications are not required, the cost is low. Furthermore, a long fully threaded bolt member having a male thread is formed in advance, and this fully threaded bolt member is adjusted according to the length of the flange portion to be fixed. If the threaded bolt member is cut, it is not necessary to prepare in advance a fully threaded bolt with different specifications for each length of the flange portion, and it is possible to greatly reduce costs.

According to the second aspect of the present invention, the fully threaded bolt can be easily mounted at a predetermined position on the implant side flange by engaging a portion of the distal end side of the male thread of the fully threaded bolt with the incompletely threaded portion. By tightening a nut on each fully threaded bolt, it is possible to prevent the fully threaded bolt from coming off from the thick part, while crimping the implant side flange and the cap side flange with equal force over the entire circumference. By improving the sealing performance of the joint surfaces, they can be firmly connected in a stable state. An incompletely threaded portion can be easily processed so as to be continuous from the female thread at the same time as the female thread is formed in the thick portion.

According to the third aspect of the invention, the fully threaded bolt can be easily attached to a predetermined position on the implant side flange by causing the distal end side of the fully threaded bolt to abut against the pawl and engage the fully threaded bolt. By tightening a nut on each fully threaded bolt, it is possible to prevent the fully threaded bolt from coming off from the thick part, while crimping the implant side flange and the cap side flange with equal force over the entire circumference. By improving the sealing performance of the joint surfaces, they can be firmly connected in a stable state. By processing the female thread halfway through the thick portion, the pawl portion can be easily formed on the body at the same time as the female thread is formed.

According to the fourth aspect of the invention, since the thick portion is provided in the vicinity of the joint of the body on the side where the tip end side of the fully threaded bolt of the stud side flange faces, the stud side flange and the stud side flange are formed at the same time as the molding process such as casting. A thick portion can be provided between the body and the body.

According to the fifth aspect of the invention, the body and the cap can be connected using a common fully threaded bolt without using stud bolts with different specifications according to size and pressure class. At the time of connection, this fully threaded bolt can be easily installed in place by simply tightening the fully threaded fixing bolt. Excellent in nature. As a result, the flange portions of the body and the cap are connected to each other while preventing inclination, thereby improving sealing performance. It is possible to easily provide the thick portion by utilizing surplus thickness or the like at the time of manufacturing without processing the thick portion separately. Since it does not require stud bolts of various specifications, it is cost-effective. Furthermore, it is possible to avoid preparing in advance fully threaded bolts with different specifications each time for each flange length, which greatly reduces costs. can be suppressed.

1 is a perspective view showing an example of a valve according to the valve fixing structure of the present invention; FIG. (a) is a side view showing an example of a valve according to the valve fixing structure of the present invention. (b) is a cross-sectional view taken along line AA of (a). It is a B section enlarged sectional view of FIG.2(b). (a) is a cross-sectional view showing another example of a valve according to the valve fixing structure of the present invention. (b) is an enlarged cross-sectional view of part C of (a). FIG. 11 is a partially enlarged cross-sectional view showing a fixing structure of a conventional ball valve;

A valve fixing structure and a valve according to the present invention will be described in detail below based on embodiments.
FIG. 1 shows an example of a valve to which the valve fixing structure of the present invention is applied, FIG. 2(a) is a side view showing an example of the valve by the valve fixing structure of the present invention, and FIG. 2(b). is a cross-sectional view taken along the line AA of FIG. 2(a). FIG. 3 shows an enlarged cross-sectional view of the B portion of FIG. 2(b).
In the figure, a valve (hereinafter referred to as a valve body 20) comprises, for example, a ball valve, and includes a body 21, a cap 22, a fully threaded bolt 23 for implantation, and a nut 24. It has a valve seat made of a seat ring. The valve body 20 has a valve body rotatably mounted on a valve seat via a stem in a body 21, and is provided such that a flow path can be opened and closed by rotation of the stem.

The body 21 is provided with an installation side flange 25 on the connection side with the cap 22, and a fully threaded bolt 23 is installed in the installation side flange 25. - 特許庁Female threads 26 are formed at a plurality of locations where the fully threaded bolts 23 of the stud flange 25 are implanted, four locations in this embodiment, communicating with the female threads 26 at substantially equal intervals. A male screw 27 is provided so as to be screwable.

A thick portion 30 protruding in the outer peripheral direction is provided in the vicinity of the base of the body 21 on the side facing the tip 23a of the fully threaded bolt 23 in the implantation side flange 25, and a female screw 26 extends to the thick portion 30. The thick portion 30 is provided for all four female screws 26 . The thick portion 30 does not need to be provided over the entire circumferential direction of the female thread 26 , and may be provided in a size that covers a part of the female thread 26 . Here, the extent to which a part of the female thread 26 is covered refers to a state in which the thick portion 30 overlaps the projected area of the female thread 26 provided on the implant-side flange 25 .

In this manner, at least a portion of the female thread 26 is formed in the thick portion 30 , and an incomplete thread portion 31 of the female thread 26 is formed on the distal end side of the thick portion 30 . A distal end portion 32 of the male thread 27 of the fully threaded bolt 23 can be engaged with the incompletely threaded portion 31 .

Conventionally, the body 21 and the planting-side flange 25 are connected by extending the body outer peripheral surface 21a and the planting-side flange surface 25a as they are and intersecting them, or the connecting portion has a slightly tapered or rounded surface. are provided, and their flesh does not hang over the female screw 26.例文帳に追加In this embodiment, as shown in FIG. 3, a thick portion 30 is provided at the boundary between the outer peripheral surface 21a of the body 21 and the implant-side flange surface 25a so as to extend over the female screw 26. It becomes possible to extend the female screw 26 to the .

In the example of FIG. 3, the thickness of the thick portion 30 gradually decreases from the implant-side flange surface 25a toward the outer peripheral surface 21a of the body 21. The thick part 30 is provided so as to be stopped at a position where the thickness is applied to the female screw 26 instead of being provided so as to penetrate to the position where the thickness does not overlap the female screw 26, so that the tip is incompletely screwed. It becomes possible to set it as the part 31. FIG.

On the other hand, the cap 22 has a cap-side flange 33 on the connection side with the body 21 , and the cap-side flange 33 is provided so as to be connectable to the implantation-side flange 25 . Through holes 34 are formed at equal intervals in the cap-side flange 33 at four locations where the female screws 26 face each other.

When the body 21 and the cap 22 are to be flange-connected, first, the male screws 27 are screwed into the female screws 26 at four locations to fix the fully threaded bolts 23 . At this time, the distal end portion 32 of the fully threaded bolt 23 is engaged with the incompletely threaded portion 31 on the thick portion 30 side, and the distal end 23a side of the fully threaded bolt 23 is attached to the implanted side flange 25 in a positioned state. be. As a result, the four fully threaded bolts 23 protrude from the planting-side flange 25 to the side where the cap 22 is attached by a substantially constant length.

In this state, the cap 22 is aligned with the body 21 by abutting the cap side flange 33 against the planting side flange 25 while inserting the rear end side of the fully threaded bolt 23 into each through hole 34 of the cap side flange 33 . It is temporarily assembled in the state where it was done. At this time, the fully threaded bolt 23 is provided in advance so as to have a length that allows the nut 24 to be screwed to the rear end side through the implantation side flange 25 and the cap side flange 33 .

Subsequently, a nut 24 is screwed onto the rear end side of the fully threaded bolt 23 protruding from the cap side flange 33 through the through hole 34, and by fastening the nut 24 and the fully threaded bolt 23, the planting side flange 25 and the cap side flange are connected. 33 are connected to constitute the valve fixing structure of the valve body 20 of the present invention.

In the above embodiment, a ball valve is used as the valve main body 20, but the body and cap of a valve other than the ball valve can be connected by the valve fixing structure.

The female screw 26 on the side of the planting side flange 25 and the through hole 34 on the side of the cap side flange 33 are provided at four locations, respectively, but the number of these is arbitrary, and the flanges of the planting side flange 25 and the cap side flange 33 are provided. You may change suitably according to a diameter, valve|bulb size, etc.

The thick portion 30 is the side facing the tip 23a side of the fully threaded bolt 23 in the implantation side flange 25, and at least a portion of the female thread 26 is applied to the body. It may be provided at a location other than the vicinity of the base of 21 . Alternatively, the thick portion may be formed so as to protrude circumferentially from the implant-side flange 25, and the incomplete thread portion may be provided over the entire inner circumference of this thick portion. However, the vicinity of the base of the body 21 is often built up with radius, taper, etc., so that it is easy to form a thick wall during casting, etc., and the strength of the vicinity of the base can be easily maintained. For this reason, it is more preferable to provide it in the vicinity of the root.

Next, the operation of the above embodiment of the valve fixing structure and the valve of the present invention will be described.
The valve fixing structure described above is a fixing structure that connects the body 21 of the valve body 20 and the cap 22, and in order to flange-connect them, a fully threaded bolt 23 is applied to the flange connecting portion (body attachment portion). It is a thing.

A plurality of female threads 26 are formed in communication with a plurality of locations of the planting side flange 25 provided on the body 21 side, and a thick portion is formed near the base of the planting side flange 25 with the body 21 on the side facing the tip side of the fully threaded bolt 23. 30 is provided, and a part of the internal thread 26 is extended to the thick portion 30, so that the thick portion 30 can be provided at the same time when the body 21 is processed by casting or the like.

Further, the incompletely threaded portion 31 of the female screw can be formed at the same time when the female screw 26 is processed in the thick portion 30 . In this case, when the female thread 26 is formed by thread cutting from the outside of the implanted side flange 25, the incomplete thread portion can be easily formed by inserting the tip end of a thread cutting tool (not shown) into the thick portion 30 to cut it. 31 can be provided.

The fully threaded bolt 23 can connect the planting side flange 25 and the cap side flange 33, and the fully threaded bolt 23 can be used in common. Further, it is also possible to provide an elongated fully threaded bolt in advance and cut it according to the thickness of the flanges 25 and 33 connecting the elongated fully threaded bolt for use.

When the fully threaded bolt 23 is assembled into the body 21, the fully threaded bolt 23 is screwed into the female thread 26, and the distal end portion 32 of the male thread 27 is an incomplete thread forming a part of the female thread formed in the thick portion 30. When approaching the part 31, it is possible to continue to enter. In this case, when the distal end portion 32 of the male thread 27 reaches the incomplete threaded portion 31 of the female thread 26 , the fully threaded bolt 23 should be screwed loosely enough to stop at the incomplete threaded portion 31 . As a result, the four fully threaded bolts 23 having approximately the same overall length can be screwed to the same depth with respect to the female thread 26, and the protruding lengths toward the cap side flange 33 can be approximately the same.

When connecting the body 21 and the cap 22, the valve body is assembled into the body 21 through the stem in the state where the fully threaded bolt 23 is attached, and the rear end side of the fully threaded bolt 23 is inserted into the through hole 34. By abutting the cap side flange 33 against the planting side flange 25, the cap 22 can be temporarily assembled to the body 21 while guiding the cap 22 with the four full screw bolts 23. - 特許庁

Further, while the body 21 and the cap 22 are aligned with the fully threaded bolt 23 , the nut 24 is screwed onto the rear end side of the fully threaded bolt 23 protruding from the cap-side flange 33 through the through hole 34 . By tightening the nut 24, the fully threaded bolt is pushed into the body 21 side, and the planting side flange 25 and the cap side flange 33 can be firmly connected. At this time, the distal end portion 32 of the male screw 27 engages the incompletely threaded portion 31 of the female screw 26 , so that the incompletely threaded portion 31 and the distal end portion 32 function as stoppers to tighten the fully threaded bolt 23 . Fasten in the positioned state.

As described above, by regulating the positioning of the tip of the fully threaded bolt 23 and making the length of the protruding side toward the cap 22 substantially the same, the flanges 25 and 33 are prevented from tilting to each other, and the nut is evenly distributed. 24 is tightened to the rear end of the fully threaded bolt 23 to reliably prevent leakage of the internal fluid from the joint surface of the flange. Since the tip of the fully threaded bolt 23 is screwed until it protrudes from the planting-side flange 25, the body 21 and the cap 22 can be connected even when the thickness of the casting constituting the planting-side flange 25 is different.

FIG. 4 shows another example of a valve according to the valve fixing structure of the present invention. In addition, in this embodiment, the same parts as those in the above embodiment are represented by the same reference numerals, and the description thereof is omitted.

In the valve body 40 of this embodiment, a thick portion 30 is provided in the vicinity of the base of the body 21 on the side facing the tip side of the fully threaded bolt 23 in the implanted side flange 25, and the female screw provided in the thick portion 30. A claw portion 41 projecting toward the inner diameter of 26 is provided.

When the fully threaded bolt 23 is screwed into the planting-side flange 25, the tip 23a side of the fully threaded bolt 23 abuts against the claw portion 41, whereby the fully threaded bolt 23 is engaged with the female thread 26 and positioned. Become.

This makes it possible to connect the body 21 and the cap 22 using the fully threaded bolt 23 and the nut 24 without using a stud bolt, as in the case where the thick portion 30 is provided with the incompletely threaded portion 31. Become. At the time of these connections, the pawl portion 41 exerts a stopper function against the fully threaded bolt 23, so that when the nut 24 is tightened, it is strengthened while preventing inclination and displacement, and loosening of the fully threaded bolt 23 and the nut 24 is prevented. You can block it and stay connected.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the description of the above embodiments, and is within the spirit of the invention described in the claims of the present invention. and can be modified in various ways.
For example, if it is a structure that connects flanges using fully threaded bolts, it can be used for connection points other than valve bodies and caps, and it can also be applied to various piping equipment other than valves. can.

20, 40 valve body 21 body 22 cap 23 fully threaded bolt 23a tip 24 nut 25 planting side flange 26 female screw 27 male screw 30 thick portion 31 incomplete threaded portion on female screw side 32 tip of male screw 33 cap side flange 34 Through hole 41 Claw portion

Claims (5)

A fixing structure for connecting a valve body and a cap, wherein a plurality of female threads to which male threads of a fully threaded bolt for implantation are screwed are formed in communication with a plurality of locations of an implantation side flange provided on the body side. A portion of the female thread is formed by extending the thick portion provided on the side of the implant-side flange facing the tip side of the fully threaded bolt, and the fully threaded bolt is screwed into the female thread. A cap-side flange provided on the cap side is abutted against the planting-side flange in a state in which the distal end side is engaged with the thick portion side and positioned, and the cap-side flange is inserted through a through hole formed in the cap-side flange. A fixing structure for a valve, wherein a nut is screwed onto the rear end side of the fully threaded bolt protruding from the valve to connect the planting-side flange and the cap-side flange. 2. A fixing structure for a valve according to claim 1, wherein said thick portion is provided with an incompletely threaded portion of said female thread, and said incompletely threaded portion engages a distal end side of said male thread of said fully threaded bolt. 2. The valve fixing structure according to claim 1, wherein the thick portion is provided with a pawl portion projecting toward the inner diameter of the female thread, and the distal end side of the fully threaded bolt abuts against and is locked to the pawl portion. 4. The valve fixing structure according to any one of claims 1 to 3, wherein the thick portion is provided in the vicinity of the root of the body on the side facing the tip end side of the fully threaded bolt of the implantation side flange. A valve, wherein the body and the cap are connected by the valve fixing structure according to any one of claims 1 to 3.

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