JPH0510869U - Butterfly valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a butterfly valve with minimal leakage by improving the accuracy by simplifying processing. [Structure] Shaft hole 13 for valve shaft 21 to housing 1
One is provided so that the arc-shaped contact surface of the valve 22 with respect to the valve shaft 21 is shorter than the diameter of the valve shaft, and the contact surface with the notch valve shaft 21 is used as surface contact to fill the filler 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  This invention relates to a butterfly valve, especially in a large power transformer, it is sealed inside. A cooler is attached to prevent the temperature rise of the insulating oil that is put in and to maintain its function. If a problem occurs in the cooler between the cooler mounting part of the power transformer and the cooler. A cooler valve is installed for repair and replacement, but it is suitable as a cooler valve. It is about valves.

[0002]

[Prior art]

  Widespread use of butterfly valves as cooler valves generally leads to larger power transformers As a result, the loss also increases, and therefore the number of coolers installed increases and the cooler The structure is simple and operation This is because the oil flow loss pressure is small, and the economy is excellent.

[0003]   The conventional butterfly valve is as shown in FIGS. 8 and 9, and the housing 1 has the same outer shape. Non-illustrated connection with a circular or square shape, with a circular shape in the center, following the shape of a hand The valve seat 11a is formed by opening the opening passage portion 11 having substantially the same diameter as the inner diameter of the counterpart pipe. And connect it to the flange of the mating pipe connected to the transformer body with bolts and nuts. Stop hole 12 for tying should be drilled, and it should be at the center of opening passage portion 11. A shaft hole 13 for the valve body 2 and the valve shaft 21 is provided. This shaft hole 13 Consists of a through hole 13a and a blind hole 13b.

[0004]   The valve body 2 is a disc-shaped valve 2 fitted in a valve shaft 21 and a valve seat 11a fitted in a shaft hole 13. It is composed of two, and the valve 22 is fitted into the elongated groove 21a of the valve shaft 21 and the screw 23 is used. When assembled, the minute gap S between the arc-shaped peripheral surface of the valve 22 and the smooth surface of the elongated groove 21a is filled. It was designed to be filled with filler 3. Further, the valve shaft 21 has O-ring grooves 21b, 21b. Is provided, the shaft is sealed with an O-ring 4, and the operating portion 21c at the shaft end projects from the housing 1. It is attached so as to come out, and the operating portion 21c is covered with a cap-shaped valve lid 5 and a small bolt 6 I'm trying to stop at.   The valve body 2 is rotated by a special tool having an opening that fits into the operation portion 21c. However, it is possible to use a monkey wrench instead.

[0005]

[Problems to be solved by the device]

  The shaft hole 13 needs to be machined so that the valve shaft 21 fits in the center of the opening passage portion 11. However, this processing requires considerable skill and labor.   That is, when drilling with a drill, etc., use a drill with the required length While the drill tip advances to the hole 13a, the precision of the drill tip is Evenly, since the resistance disappears when passing through the opening passage portion 11, the tip moves and the blind hole 1 3b was reached, and eccentricity occurred when the processing was continued. Eccentric The valve 22 does not fit snugly on the valve seat 11a, and the valve passage 11 is opened between the opening passage 11 and the valve 22. There will be a gap in it, and it will leak from here.   Further, when the opening passage portion 11 has a large diameter, a hole is drilled from both sides of the housing 1. After further reaming and ensuring centrality, one hole is partially closed with a blind plug. It required a laborious process.

[0006]   To attach the valve 22 to the valve shaft 21, first, the rod rod, which is the material of the valve shaft 21, is formed into an elongated groove. 21a is provided, and for that purpose, as shown in FIG. 10, first, a horizontal milling machine is used. Cutter K was attached to and cut into an approximately semi-circular shape, and then left uncut with a slotter machine. The part is cut to form an elongated groove 21a, which is slid into the elongated groove 21a to make a difference. Although the valve 22 is placed in the center and closed by the filler 3, the valve shaft 21 and the valve The peripheral surface of 22 becomes a line contact and a minute gap is generated due to the problem of processing accuracy. It was inevitable to induce a leak even if it was closed.

[0007]   This device is a conventional butterfly valve, but it is difficult to process in its manufacture. Aiming to obtain a butterfly valve that simplifies, improves accuracy, and has little leakage. It was devised.

[0008]

[Means for Solving the Problems]

  This invention was made to solve such problems of the conventional technology, and A valve in which a circular valve is attached to the valve shaft in a housing that opens the circular opening passage. In a butterfly valve with body rotatably mounted, for valve stem to housing Only one shaft hole is provided, and the connection part between the valve peripheral surface and the valve shaft is machined by matching one with the other. It is characterized in that it is configured to be in contact with the surface and is filled with a filler. Of.

[0009]

【Example】

  The contents of the present invention will be described below with reference to the embodiments shown in the drawings.   The butterfly valve is as shown in FIGS. 1 to 3, and the housing 1 has a rectangular outer shape. Then, a circular opening passage portion 11 is opened in the center to form a valve seat 11a, and a bolt is provided around the valve seat 11a. Install and connect the stop holes 12 for connecting the pipes with nuts etc. One through hole 13 is provided so as to be orthogonal to the pipe. Regarding the outer shape, as in the conventional product shown in FIG. The structure may have a flat cutout.

The valve body 2 is composed of a valve shaft 21 fitted into the shaft hole 13 and a disc-shaped valve 22 fitted in the valve seat 11a. The valve 22 is inserted into an elongated groove 21a having one of the valve shafts 21 opened. It is fitted and assembled with screws 23. Here, conventionally, in order to withstand the pressure in the closed state, both ends of the valve shaft 21 are fitted and supported in the shaft hole 13 formed of the through hole 13a and the blind hole 13b at the opposite position of the housing 1 to support the shaft hole. Since only one through hole 13 is provided, the shaft hole 13 and the valve shaft 21 are made slightly thicker so as to support the pressure in the closed state. The strength of the cylindrical shaft is proportional to the cube of the shaft diameter. This section modulus: if Shimese in estimates formula Z Z = πD ^3/32 next shaft diameter is proportional to the cube of D.

[0011]   The O-ring grooves 21b, 21b of the valve shaft 21 are provided closer to the valve seat 11a. The circumferential leakage path of the valve shaft 21 and the shaft hole 13 is shortened to improve the performance. It Further, the valve shaft 21 is embedded in the housing 1, and the top of the valve shaft 21 is grooved. An operation portion 21c, which is cut out in the mold, is provided.

[0012]   The arc-shaped contact surface between the valve 22, the peripheral edge, and the elongated groove 21a of the valve shaft 21 is defined by the diameter of the valve shaft 21. The contact with the notch valve shaft 21 becomes a surface contact to reduce leakage, Then, the filler 3 is filled into the gap which is narrower than the conventional one (see FIG. 4).   If the notch is larger than the shaft diameter of the valve shaft 21, a hole is formed between the valve 22 and the valve seat 11a. Will open.   In the above description, the valve 22 is notched to have a rectangular shape. The elongated groove 21a of the shaft 21 is cut into an arc shape according to the shape of the peripheral edge of the valve 22. You can also do it. Specifically, in an arc shape with a milling machine etc. according to the valve diameter from the axial direction. Process the groove.

[0013]   The valve lid 5 completely blocks leakage through a slight gap between the valve shaft 21 and the O-ring 4. At the same time, an interlock system is used to visually check the open / closed state of the valve body 2. .   The valve lid 5 has a plate shape having a bent portion 51 at one end, and the ends of the shaft hole 13 are provided at the front and back in the center. So that the projections 52, 52 that fit into the operation portion 21c of the valve shaft 21 are provided. I am doing it. Whether the valve lid 5 is integrally manufactured by forging or the like to form the protrusion 52 Alternatively, the protrusion 52 is separately manufactured and caulked on the main body, brazed, welded, etc. It may be attached integrally. 54 is a hole for passing the small bolt 6.

[0014]   The housing 1 has an escape hole 14 for the bent portion 51 and a drainage hole following the escape hole 14. 14a is perforated. Further, as in the conventional example, the shaft hole 1 of the housing 1 3 are provided with screw holes 15 on both sides, and the valve lid 5 is fixed with small bolts 6.

[0015]   Characters that match the open / closed state of valve 22 (shut "S" and open "O" or " "Open" and "Closed" are printed on the front and back of the valve lid 5 by using appropriate means such as embossed letters and stickers. Displayed. In addition, it is parallel (open) or orthogonal (closed) to the connected main pipe. The tip shape of the protrusion 52 of the valve lid 5 may be made visible.

[0016]   The valve shaft 21 is rotated by a dedicated tool as shown in FIG. However, if the bent portion 51 is provided at one end of the valve lid 5, the bent portion 51 may be formed on the valve shaft 21. Alternatively, the operation may be performed by inserting the operation portion 21c into the operation portion 21c.   Further, the one shown here is fitted in the operating portion 21c to rotate the valve shaft 21. Show what can be done. Further, the valve lid 5 is bent as shown in FIGS. A claw piece 53 is provided by forming the claw piece 53 without the portion 51, and the claw piece 53 is used for the valve shaft 21. 6 into the operating section 21c of the It can also be rotated.

[0017]

[Effect of device]

  The present invention has the above-mentioned structure, and the shaft for the valve shaft to the housing Only one through hole can be used to save the work of making holes in the housing. Of. In order to withstand the pressure in the closed state of the valve body, the shaft hole and the valve shaft If it is made slightly thicker and supported, it will be stronger.

[0018]   Also, the arc-shaped abutment surface of the valve on the valve shaft is shorter than the diameter of the valve shaft, and the contact with the notched valve shaft is By making surface contact and filling the minute gap with the filler, the seal will be close to perfection. Therefore, the occurrence of leakage is reduced compared to the conventional joining by line contact.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a butterfly valve according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is an enlarged view showing a joined state of a valve and a valve shaft.

5A and 5B show another embodiment of the valve lid of the valve shaft, in which a is a front view and b is a plan view.

FIG. 6 is a perspective view showing an opening / closing operation of the valve lid.

FIG. 7 is a perspective view showing a special tool for rotating the valve shaft.

FIG. 8 is a partially cutaway front view of a conventional butterfly valve.

9 is a sectional view taken along line BB of FIG.

FIG. 10 is a schematic view showing processing (a, b) of elongated grooves of a conventional valve shaft and mounting (c) of the valve on the valve shaft.

[Explanation of symbols]

1 housing 11 Opening passage 11a valve seat 12 stop holes 13 shaft hole 13a through hole 13b blind hole 2 valve body 21 valve stem 21a elongated groove 21b O-ring groove 22 valves 23 screw 3 Filler 4 O-ring 5 valve lid 6 small bolts

Claims (2)

[Scope of utility model registration request] 1. A butterfly valve, wherein a valve body having a circular valve attached to a valve shaft is rotatably mounted on a housing having a circular opening passage portion formed at the center thereof. It is characterized in that only one shaft hole is provided for connecting the peripheral surface of the valve and the valve shaft so that one of them is in contact with the other surface so as to make a scraped surface contact, and the filler is filled. Butterfly valve. 2. The butterfly valve according to claim 1, wherein the arc-shaped abutment surface of the valve with respect to the valve shaft is shorter than the diameter of the valve shaft and the filler is filled with the contact with the notched valve shaft as a surface contact. A butterfly valve characterized in that