JPS6040939Y2 - Bearing retainer structure in butterfly valve - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a bearing holding structure in a butterfly valve.

As shown in the first diagram, a conventional butterfly valve has a disc-shaped valve body 2 with a valve shaft 3 provided inside a valve body 1.
The valve body 2 can be opened and closed by the rotation of the valve body 1, and the valve seat of the valve body 1 and the valve seat of the valve body 2 are shaped so as to be tightly closed when the valve is closed.

Furthermore, the butterfly valve rotatably supports the upper and lower ends of the valve shaft 3 inside a bearing retainer 4 fitted inside valve shaft support parts 1a and 1a' that protrude from the outer surface of the valve body 1 in the vertical direction. The bearing retainer 4 is fixed to the valve shaft support portions 1a and 1a' with stud bolts 1b, and the inner end surface 4a of the bearing retainer 4 is in close contact with the neck portion 2a of the valve body 2 while maintaining a constant surface pressure. The sliding surfaces C that slide on each other are shaped like each other.

When the valve body 2 is repeatedly opened and closed in such a structure,
The sliding surface C will wear out over many years of use, making it difficult to maintain a constant surface pressure.

That is, it becomes difficult to obtain the surface pressure necessary for water shutoff when the valve is closed, and the water shutoff performance is forced to deteriorate.

Further, as a method for generating a constant surface pressure on the sliding surface C, since the thrust force generated by tightening the nut 6 directly generates the surface pressure, the surface pressure is likely to be set too high or too low.

For this reason, fine adjustment is necessary, but this adjustment is difficult.

In addition, as another conventional example, the valve box is lined with a rubber sheet, a bushing inserted into the valve stem is brought into contact with the valve stem insertion part, and a bushing is fitted so as to be slidable in the axial direction. There is a butterfly valve in which a spring is inserted between the bushing and the sleeve to press a rubber sheet to the valve body.

This butterfly valve has a spring sandwiched between the bushing and the sleeve, so if fluid gets in, it will cause rust etc., reducing the function of the spring and making it impossible to adjust the crimping force. It is something to do.

Furthermore, when replacing springs or performing maintenance inspections, etc., the structure is complex and requires disassembly due to the large number of component parts.
Assembly also took time.

In addition, since only a single adjustment nut is provided on the flange of the sleeve, pressure is applied only from one direction when retracting the spring, and the bush is not pressed evenly, causing the rubber sheet and valve body to This resulted in uneven crimping, and it was not possible to apply an even and appropriate crimping force.

In addition, because the contact area between the rubber sheet and the valve plate near the valve stem insertion part is curved, the pressing force of the bushing tends to be biased, making it difficult to press it onto the valve plate accurately. , unnecessary pressing force was also added.

The present invention was developed to solve these problems, and is a butterfly valve that has a simple structure, is easy to maintain and inspect, and transmits pressing force evenly and accurately to the sliding surface. Even if the sliding surface between the inner end surface of the bearing holder and the valve body neck wears out, the inner end surface of the bearing holder remains in close contact with the valve body neck due to the elastic force of the elastic member, so that the sliding surface remains constant. A butterfly valve that provides an appropriate surface pressure, ensures water-tightness over a long period of time, and allows for easy tightening with the appropriate surface pressure when setting the bearing retainer on the support. The present invention aims to provide a bearing retaining structure in the present invention.

The configuration of the present invention will be explained below based on the drawings.

First, FIG. 2 is an enlarged cross-sectional view of the main part of the present invention, which corresponds to the part inside the circle in FIG. 1.

In the figure, reference numeral 1 denotes a valve box, and a plurality of stud bolts 1b are installed at the lower part of the valve shaft support part 1a that protrudes in the vertical axis direction of the valve box, and are formed on the flange 4b of the bearing retainer 4. The bearing retainer 4 is fitted into the valve shaft support portion 1a so that the through hole 4' passes vertically through the stud bolt 1b, and the nut 6 is screwed onto the bolt 1b.
An elastic member 5 is interposed between the bearing holder 4 and the bearing holder 4, and the nut 6 is tightened.

As shown in FIG. 2, the sliding surface C is such that the inner end surface 4a of the bearing holder and the valve body neck 2a are each formed at right angles to the valve shaft. The valve body neck portion 2 is pressed without biasing the pressure on the inner end surface 4a of the presser foot.
This allows for more appropriate surface pressure to be provided.

As shown in the embodiments of FIGS. 3a to 3e, the elastic member 5 is a washer-type disc spring, which is formed thin with a curved portion 5' toward the outer periphery, and is attached to one or more stud bolts 1b.
It is fitted in.

That is, the elastic member 5 can be constructed by a single disk spring as shown in FIG. The structure shown in FIG. 3C is as shown in FIG.
Various configurations are shown, such as a spring configured as shown in FIG. 3 d, in which the curved portions 5' of 5' are combined in opposite directions, and a spring formed in a ring shape like a tire as shown in FIG. 3 e. However, the present invention is not limited to the disc spring described above, and can be implemented with any shape or combination of spring members having a similar elasticity function.

The elastic member 5 has a through hole 5'' formed in the center, and the through hole 5'' is vertically penetrated by the stud 1b, and when the nut 6 is tightened, the bearing retainer 4 is elastically moved against the valve shaft support portion 1a. The situation is very tense.

Therefore, the bearing retainer 4 is attached to the valve body neck portion 2a by the elastic member 5.
oppressed by the side.

Note that the elastic member 5 is also attached in the same manner as described above between the bearing retainer 4 and the nut 6 disposed on the valve shaft support portion la' below the valve case 1.

The elastic member 5 used in the present invention is formed into a thin plate shape as shown in the above embodiments, and no matter which form is taken, the elastic member 5 will not protrude bulkily toward the tip of the stud 1b. There is no.

The inner end surface 4a of the bearing retainer 4 constantly presses against the neck portion 2a of the valve body 2 by the elastic member 5, and since the sliding surface C is formed perpendicular to the valve shaft, the sliding surface C is perpendicular to the valve shaft. Even if the sliding surface C wears out, the surface pressure of the sliding surface C is always kept constant, and there is no bias in the pressing force, ensuring watertightness over a long period of time.

Therefore, by tightening the nut 6, the elastic member 5 finely adjusts and presses the inner end surface 4a of the bearing presser against the valve body neck portion 2a, and at the same time prevents the nut 6 from loosening as much as possible, so that an appropriate surface pressure can be maintained.

As explained above, the butterfly valve bearing retainer structure according to the present invention includes an elastic member, such as a disc spring, which presses the bearing retainer fitted in the valve shaft support portion against the valve body neck portion to support the valve shaft. , the sliding surface is formed perpendicular to the valve stem, so even if the sliding surface between the bearing holder and the valve body neck wears out, the bearing holder will still hold the valve body. It follows and adheres closely to the neck, ensuring constant and appropriate surface pressure.

Furthermore, since multiple bolts are provided and the nuts can be adjusted as appropriate, the pressing force can be finely adjusted, and the pressing force can be evenly applied to the sliding surface without unevenness, allowing for long Water-tightness is ensured over time, and smooth opening/closing valve action is performed.

Further, when setting the bearing holder on the valve stem support part, it is possible to easily set the bearing holder with appropriate surface pressure.

Furthermore, it has a simple structure, and when replacing the elastic member, unlike the one that is sandwiched within the valve shaft support,
Man-hours.

It is easy to perform and does not require much time, and is easy to maintain.
It has excellent inspection properties.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional front view of a conventional butterfly valve, Figure 2 is an enlarged sectional view of the main parts of the butterfly valve according to the present invention, and Figure 3 a.
"-e is a sectional view of various elastic members used in the present invention. 1... Valve box, la, la'... Valve box support part, 1b... Plant Included bolt, 2... Valve body, 2a... Valve body neck, 3... Valve shaft, 4... Bearing holder, 4'... ...Through hole, 4a...Bearing presser inner end surface, 4b...
Flange, 5...Elastic member, C...Sliding surface.

Claims (1)

[Scope of utility model registration request] In a butterfly valve in which a valve body is housed in a valve body and the valve stem is directly supported by a bearing retainer fitted into a valve stem support part, the valve stem support part has a plurality of pieces parallel to the valve stem on the opening end surface. The bolt is installed, and the bearing retainer has one opening inner end surface as a sliding surface perpendicular to the valve shaft, and the other end has a flange on the outer circumferential surface so that the bolt can be mounted on the opening end surface. The valve body has a sliding surface at right angles to the valve shaft at the valve body neck, and the tip of the bolt is passed through the bolt through hole of the bearing holder, so that the protruding bolt has elasticity. A bearing for a butterfly valve, characterized in that a member is fitted, a nut is further screwed and tightened, and the sliding degree of the sliding surface between the inner end surface of the bearing presser and the valve body neck is constantly finely adjusted and pressed. Presser foot structure.