JP2536825Y2 - Butterfly valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve which opens and closes a flow passage by a valve plate provided on the rotation shaft by rotating a rotation shaft arranged orthogonally to the flow passage.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional butterfly valve. In this butterfly valve 20, a rotary shaft 23 inserted through a through hole 22 of a cylindrical valve body 21 is provided.
Is rotatably supported by a bearing member (not shown) provided in the through hole 22 and a bearing recess 24 provided in a portion facing the through hole 22, and a valve is provided on a portion of the rotary shaft 23 located inside the valve body. The plate 25 is fixed by bolts 26,26.

[0003] As shown in the figure, the butterfly valve 20 has pipes 27, 27 connected to both ends thereof, and operates a handle (not shown) provided on the rotating shaft 23 to operate the valve plate 2.
By switching the direction of 5, the flow rate of the fluid flowing through the pipes 27, 27 and the inside of the valve body 21 can be adjusted.

[0004]

However, the valve plate 25 and the rotating shaft 23 of the butterfly valve 20 are inspected, repaired,
When replacing the butterfly valve, there is a problem that the entire butterfly valve 20 must be removed from the pipes 27, 27. Particularly, in the butterfly valve 20 provided in an exhaust gas pipe or a hot air duct, it is necessary to replace the valve plate or the like because harmful substances contained in the exhaust gas or the like cause severe damage to the valve plate or the like. Is covered with a heat insulating material, it is necessary to remove all the heat insulating material surrounding the butterfly valve 20, so that the labor required for work such as inspection,
The costs were enormous.

Further, when replacing the valve plate 25 and the rotating shaft 23 with new parts, it is not easy to assemble these members once disassembled with high accuracy. That is,
Assembling is performed by inserting the rotating shaft 23 into the through hole 22 and
The valve plate 25 inserted through the one end opening is fixed by bolts 26, 26. The position of the valve plate 25 is accurately held in a narrow flow path, and the tip of a tool inserted into the flow path is viewed. It is not easy to tighten the bolts 26, 26, and the valve plate 2
It was inevitable that an error would occur in the mounting position of No. 5. Therefore, even if the flow path is closed by the valve plate 25,
A gap is formed between the valve main body 21 and the valve plate 25, so that complete tightness cannot be obtained and energy is wasted.

Further, the length of the valve body 21 is
The valve plate 25 is inserted from the end of the
It must be of a length that allows the work to be fixed with the bolts 26, 26 on the front. For this reason, there are many restrictions on the shape of the valve main body 21, and there is a drawback that it is not always possible to manufacture a product that meets the requirements of the site.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and comprises a butterfly valve having a cylindrical valve body having an elongated hole extending in a pipe axis direction. A rotary shaft is provided on the center line of a valve plate having substantially the same outer shape as the flow path cross section of the portion where the long hole is located, and the valve plate is inserted into the flow path of the valve body through the long hole and the rotation is performed. A partition member having a part of the shaft protruding outside through the long hole, and a through-hole, and a rotary shaft protruding from the valve body is inserted into this through-hole, and the long hole can be opened and closed. And a closed lid member.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the butterfly valve 1 shown in the figure,
The valve body 2 is formed of a cylindrical body having both ends open. An elongated hole 4 is formed in the upper part along the pipe axis direction, and a bearing recess 5 is formed in a lower inner surface facing the elongated hole 4. The partition member 10 has a size that can be inserted. The cover member 6 includes a cover body 7 provided outside the valve body 1 and a fitting portion 8 having substantially the same shape as the elongated hole 4 provided integrally on the concave lower surface of the cover body 7. Is formed with a through hole 9. The partition member 10 includes a rotating shaft 11 and a valve plate 1.
The valve shaft mounting portion 12 is formed by cutting the lower outer peripheral surface of the rotating shaft 11 along the axial direction, and the valve plate mounting portion 12 has screw holes 13, 13 formed therein. . On the other hand, the valve plate 14 is a disk having substantially the same outer dimensions as the cross section of the flow passage at the position where the long hole 4 is located, and has holes 15 for bolt penetration on the center line.

When assembling the butterfly valve 1, first, the valve plate 14 is positioned on the valve plate mounting portion 12 of the rotating shaft 11, and the bolts 16, 16 inserted into the through holes 15, 15 are screwed into the screw holes 13 of the rotating shaft 11. , 13 and fixed. At this time, since the bolting operation can be performed with the rotating shaft 11 and the valve plate 14 at hand, the valve plate 14 is accurately positioned and fixed with respect to the rotating shaft 11. next,
The rotating shaft 11 and the valve plate 14 integrated in this manner are inserted into the flow path 3 of the valve body 2 through the long holes 4, and the lower end of the rotating shaft 11 is inserted into the bearing recess 5. Finally, the rotary shaft 11 is inserted into the through hole 9 of the lid member 6 from the upper end side, the fitting portion 8 of the lid member 6 is fitted into the elongated hole 4, and the gap between the lid body 7 and the valve body 2 is formed. The packing is properly held between the cover member 6 and the valve body 2.
Is fixed with bolts 17. The space between the through hole 9 of the cover member 6 and the rotating shaft 11 is sealed by a known sealing method.
Further, a handle (not shown) is attached to the upper part of the rotating shaft 11.

The butterfly valve 1 assembled as described above is connected between the pipes 18. Also, if the pipe 18 carries a high or low temperature fluid,
The piping 18 and the periphery of the butterfly valve 1 are protected by a heat insulating material. By rotating the rotating shaft 11 with the handle, the flow path 3 is opened and closed by the valve plate 14, and the pipes 18 and 1 are opened.
The flow rate of the fluid flowing through 8 is adjusted.

Inspection and replacement of the rotating shaft 11 and the valve plate 14,
When repairing, the bolt 17 is removed and the lid member 6 is removed from the valve body 2. When the pipes 18 and 18 and the periphery of the butterfly valve 1 are covered with a heat insulating material, the cover member 6
Remove only the insulation covering the. That is, it is not necessary to remove all the heat insulating materials surrounding the butterfly valve 1, but it is sufficient to remove only a part of the heat insulating materials. Next, the rotating shaft 11 is rotated to position the valve plate 14 in parallel with the elongated hole 4, and the rotating shaft 1 is rotated.
1 and lift it upward, and take out the valve plate 14 to the outside through the elongated hole 4. Then, the rotating shaft 11, the valve plate 14
When the inspection, replacement, repair, and the like are completed, the rotating shaft 11, the valve plate 14, and the lid member 6 are reattached to the valve body 2 in the same manner as in the assembly.
And cover the lid member 6 with a heat insulating material to return to the original use state.

A second embodiment of the butterfly valve will be described with reference to FIG. In this butterfly valve 1a, the valve body 2 includes a cover member 30. The cover member 30 has a substantially box shape with an open bottom, and a lower end of a surrounding side wall conforms to an outer peripheral shape of the valve body 2, and has a ceiling having substantially the same size as the elongated hole 4. A long hole 31 is formed. The cover member 30 has the long hole 31 positioned above the long hole 4 of the valve body 2, abuts the lower end of the cover member 30 on the valve body 2, and welds the contact portion to the valve body 2 to be integrated with the valve body 2. . The lid member 60 is made of a rectangular plate, and has a through hole 61 formed in the center. The partition member 10 is the same as that of the above embodiment.

In the butterfly valve 1a having the above configuration,
The partition member 10 is inserted into the flow path 3 via the long holes 31 and 4, and the rotating shaft 11 protruding from the long hole 31 is inserted into the through hole 61 of the lid member 60. In addition, a bolt (not shown) is screwed into the screw hole 32 of the cover member 30 through through holes 62 provided at four corners of the lid member 60, and the rotary shaft 11 and the through hole 6 are screwed.
1 and is appropriately sealed, assembled, and connected between the pipes in the same manner as the butterfly valve 1 of the above embodiment. When taking out the partition member 10 from the butterfly valve 1a, the valve plate 14 is positioned parallel to the flow path, the bolt is loosened, the cover member 60 is removed from the cover member 30, and the rotating shaft 11
And pull it up.

In the above-described embodiment, the rotating shaft 11 and the valve plate 14 are formed of different members. However, the rotating shaft 11 and the valve plate 14 may be integrally formed of the same material. Good.

[0015]

As is apparent from the above description, according to the butterfly valve of the present invention, since the long hole is provided in the tube axis direction, the strength of the valve body is weakened by providing the long hole. Nor. The assembly of the valve plate and the rotating shaft, and the assembly of these with the valve body can be performed while checking the assembly accuracy with these assembly parts at hand, so that each part can be assembled with high accuracy. it can. Therefore, there is little gap between the valve plate and the valve body when the flow path is closed by the valve plate, so that energy is not wasted and economical.

Further, even when checking and repairing the butterfly valve connected to the piping, the rotary shaft and the valve plate can be taken out by removing the lid member while the valve body is connected to the piping. Therefore, the work such as inspection and repair can be simplified, and the length of the valve body can be adjusted according to the situation at the site and necessity.

Further, even when the surroundings of the piping and the butterfly valve are covered with a heat insulating material, work such as inspection and repair is not performed.
It is not necessary to remove the heat insulating material over the entire length of the butterfly valve, and it suffices to remove only a portion from which the lid member can be removed, so that repair of the heat insulating material can be simplified.

Further, the rotary shaft and the valve plate can be integrally manufactured from the same member. In the case where the rotary shaft and the valve plate are integrally manufactured, the assembly of the rotary shaft and the valve plate becomes unnecessary.
Operations such as assembly, inspection, and repair are further simplified.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a butterfly valve according to the present invention.

FIG. 2 is a plan view of the butterfly valve according to the present invention.

FIG. 3 is an exploded perspective view of another embodiment of the butterfly valve according to the present invention.

FIG. 4 is a partial sectional view of a conventional butterfly valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Butterfly valve, 2 ... Valve body, 3 ... Flow path, 4 ... Long hole,
5: Bearing recess, 6: Lid member, 10: Partition member, 11:
Rotating shaft, 14 ... valve plate.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yuzo Tanaka 2-4-7 Kyomachibori, Nishi-ku, Osaka-shi, Osaka Inside Chugai Furnace Industry Co., Ltd. (56) References Japanese Utility Model No. 4-106571 (JP, U) Kosho 55-18596 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylindrical valve body having a long hole extending in a pipe axis direction, and a rotary shaft on a center line of a valve plate having substantially the same outer shape as a cross section of a flow passage at a portion where the long hole is located. Provided, while inserting the valve plate into the flow path of the valve body through the long hole,
A partition member configured to protrude a part of the rotating shaft to the outside via the elongated hole, and a through hole, wherein the rotating shaft projected from the valve body is inserted into the through hole, and the elongated hole is A butterfly valve, comprising: a lid member that is opened and closed.