JP2004270709A - Butterfly check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a butterfly check valve allowing adjustment of closure time even while a water supply device is operated and preventing a rotating means from being exposed to fluid (water), without the need for any special measures for security utilizing the innate characteristics of the eccentric butterfly check valve. <P>SOLUTION: The rotating means with torsional torque action is connected to at least one end of a valve shaft at a position outside a valve box. The valve shaft is disposed at a position eccentric from a valve element, and a torsion coil spring is used for the rotating means. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a butterfly check valve, and more particularly, to a butterfly check valve disposed in a pipe through which water flows to prevent a water hammer phenomenon caused by a reverse flow that occurs when another valve in the pipe is suddenly closed or the pump is stopped. About.
[0002]
[Patent Document]
JP-A-11-201310
[0003]
BACKGROUND OF THE INVENTION
2. Description of the Related Art Conventionally, the performance of a check valve is closely related to the characteristics of a target fluid and usage conditions, and various types of structures have been known so that the operation of a water supply device such as a pump can be sufficiently ensured.
[0004]
In particular, the check valve taking the above-mentioned countermeasures against water hammer includes a quick-closing assist mechanism using a weight, a compression coil spring, and a tension coil spring, and a relief device that partially releases the water hammer pressure by delaying the valve closing time. It has a structure with a closing assist mechanism. An eccentric butterfly check valve is known as a non-return valve without these auxiliary mechanisms and capable of minimizing the impact of the water hammer phenomenon, and the present invention also has a basic structure of this eccentric butterfly valve. A type check valve is assumed.
[0005]
Also, one of the structures of a check valve using a coil spring is described in the above-mentioned patent document, and the valve body is urged by a coil spring linearly in the flow direction of water. When there is no flow or reverse flow, the valve body is pressed against the opening of the valve box by the coil spring to close the flow path.
[0006]
[Problems to be solved by the invention]
However, the above-mentioned eccentric butterfly type check valve has a small adverse effect on the water supply device itself due to its configuration, but is not necessarily sufficient in view of the impact on the recent housing environment and the like, and is a weight as a means for enhancing the rapid closing action. There is a method using a spring. However, if these parts are installed outside the valve box, the closing time can be adjusted according to the operating conditions of the water supply device. However, since these parts are movable parts, the protective fence and protective cover must be installed. Safety measures such as mounting are required.
[0007]
In addition, if a weight or a spring is installed in the valve box, the above-described safety measures become unnecessary.However, it is impossible to adjust the closing time, and if necessary, the operation of the water supply device is interrupted each time. There was an inconvenience that had to be done.
[0008]
[Object of the invention]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances and problems, and it is necessary to solve such problems and to take advantage of the inherent characteristics of the eccentric butterfly type check valve while maintaining special safety measures. It is an object of the present invention to provide a butterfly check valve in which the closing time can be adjusted even during the operation of the water supply device, and the rotating means does not drift to the fluid (water).
[0009]
[Means for Solving the Problems]
In order to achieve this object, the butterfly check valve according to the present invention is characterized in that at least one end of a valve shaft is connected to a rotating means acting by torsional torque at an external position of a valve box. The valve shaft is provided at an eccentric position with respect to the valve body, and a torsion coil spring is used as the rotating means.
[0010]
In the butterfly check valve according to the present invention, the rotation means may be connected by fitting a protrusion or a groove formed at one end of the rotary drive shaft to a groove or a protrusion formed at one end surface of the valve shaft. Then, one end of the adjusting member is fitted into a hole formed at the other end of the rotary drive shaft, and each end of the torsion coil spring is fitted into a receiving hole formed at the rotary drive shaft and the adjusting member, and The adjusting member is fixed to a part of the valve box, the adjusting member integrally has a fastening flange, and the flange is fastened with a plurality of bolts. I have.
[0011]
Further, in the butterfly type check valve according to the present invention, the rotating means has a rotary drive shaft inserted through one side of the casing, and has a protrusion or a groove formed on a protruding end face of the rotary drive shaft. A torsion coil spring is fitted into a concave groove or a projection formed at one end of the valve shaft and connected to the other end of the rotary drive shaft and a receiving hole formed on an adjustment member for closing the other side of the casing. Each end is fitted, the protruding portion of the rotary drive shaft is inserted into a bearing, and the rotary drive shaft is integrally formed with a flange at a portion inside the casing. The receiving hole of the torsion coil spring is drilled in the flange, and the adjusting member covers the opening of the casing like a lid and is fastened with a plurality of bolts. And said Casing is characterized by being secured to a portion of the valve body by bolts.
[0012]
[Action]
With this configuration, the rotating means does not drift to the fluid (water) and is not exposed to the outside of the valve box. Therefore, safety measures such as a protective fence and a protective cover are not required, and the water transmission device is not required. The closing time can be adjusted even during operation.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a preferred embodiment of the present invention will be described with reference to the drawings. 1 is a front sectional view showing a butterfly check valve embodying the present invention, FIG. 2 is a side view thereof, FIG. 3 is an enlarged view of a rotating means, and FIG. 4 is a front sectional view showing a second embodiment. , FIG. 5 is a side view, and FIG. 6 is an enlarged view of the rotating means.
[0014]
In these figures, reference numeral 10 denotes a valve box, and joint flanges 11a and 11b are provided on the primary and secondary opening edges of the valve box 10 to be joined to a pipe for a flow path and the like. ing. Reference numeral 13 denotes a valve body, and a valve shaft 14 is inserted through a pair of bosses 13a, 13a having through holes integrally formed on the upper surface side of the valve body 13 and is incorporated into the valve box 10. I have.
[0015]
The valve shaft 14 is integrated with the bosses 13a by pins 23, and the valve body 13 swings around the valve shaft 14. Further, the valve shaft 14 is mounted at a position eccentric slightly above the center position of the valve body 13, abuts the annular valve seat 12 having an inclined arrangement and the peripheral edge thereof, and is located in the valve box 10 and has a flow passage. Is to be closed.
[0016]
A seal member 19 is attached around the mounting of the valve shaft 14, and a seal member 20 is also attached to its bearing 25, so that a complete seal is provided so that fluid flowing in the valve box 10 does not leak outside. .
[0017]
The above-mentioned valve box 10 is divided into two parts, a primary valve box 10b and a secondary valve box 10a, and abuts on inclined connecting flanges 10c and 10d to which a valve seat 12 is assembled. The bolts 13 are integrated into the through holes 10e and 10e, which penetrate the joint flanges 10c and 10d, through bolts, and the valve body 13 is provided on the secondary valve box 10a side. Become.
[0018]
A concave groove 14a is provided on one end surface of the valve shaft 14, and a projection 16a formed on one end surface of the rotary drive shaft 16 is fitted and connected to the concave groove 14a. The rotation of the rotary drive shaft 16 and the valve shaft 14 is synchronized.
[0019]
A cylindrical fitting hole 16b is provided at the other end of the rotation drive shaft 16, and a cylindrical projection 17b provided at one end of a spring adjusting member (metal fitting) 17 is provided in the fitting hole 16b. They are fitted and connected so that they can freely rotate with each other.
[0020]
An intermediate diameter portion 17c is provided stepwise following the cylindrical projection 17b of the adjustment member (metal fitting) 17, and a receiving hole 17d into which one end of the torsion coil spring 15 is fitted is formed in the intermediate diameter portion 17c. . The other end of the torsion coil spring 15 is fitted into a receiving hole 16c provided near the projection 16a of the rotary drive shaft 16.
[0021]
A ring-shaped flange 17a is formed near the rear end of the adjusting member (metal fitting) 17, and the adjusting member (metal fitting) 17 is joined to the joining flange by a plurality of bolts 18 through the flange 17a. 10c is fixed to the side end face.
[0022]
In this embodiment, the rapid closing time of the valve element 13 is adjusted by increasing the torsion angle of the torsion coil spring 15. After connecting the rotating means to the valve shaft 14, a plurality of bolts are set. This is done by turning only the adjusting member (metal fitting) 17 by a pitch of 18.18 ° and fastening and setting with bolts 18 ・ 18 °.
[0023]
Next, FIGS. 4 to 6 show a second embodiment of the present invention. Portions common to the first embodiment are denoted by common reference numerals, and detailed description is omitted.
[0024]
In this second embodiment, the rotary drive shaft 16d connected to the concave groove 14a formed at one end of the valve shaft 14 has a larger diameter than the rotary drive shaft 16 in the first embodiment, and 16e is also long, and a bearing 22 is arranged around the rotary drive shaft 16d.
[0025]
The rotary drive shaft 16d protrudes from the insertion hole 21a on one side of the casing 21, and a flange 16f is integrally formed at a rear end of the rotary drive shaft 16d located in the casing 21.
[0026]
The rear opening of the casing 21 is covered by an adjusting member (metal fitting) 17e. The adjusting member (metal fitting) 17e is fastened by a plurality of bolts 18.18. A hollow cylindrical projection 17f is integrally formed at the center of the back surface of the adjusting member (metal fitting) 17e, which will be described later. The torsion coil spring 15a is assisted.
[0027]
A receiving hole 17g into which one end of the torsion coil spring 15a is fitted is provided near the projection 17f of the adjusting member (metal fitting) 17e. The other end of the torsion coil spring 15a is fitted into a receiving hole 16g provided in a flange 16f of the rotary drive shaft 16d, and the receiving hole 16g is positioned symmetrically with the receiving hole 17g. 17h is a stopper for closing the receiving hole 17g.
[0028]
In the second embodiment, the method of adjusting the rapid closing time of the valve body 13 employs a method of increasing the torsion angle of the torsion coil spring 15a as in the first embodiment. First, after the bearing 22 is inserted into the shaft hole of the valve box 10, more specifically, the joint flange 10a, the casing 21 is attached to the side end surface of the joint flange 10a by the bolt 24.
[0029]
Thereafter, the rotary drive shaft 16d is inserted into the bearing 22, the projection 16e at the tip is fitted and connected to the concave groove 14a of the valve shaft 14, and one end of the torsion coil spring 15a is fitted into the receiving hole 16g. Then, the other end of the torsion coil spring 15a is fitted into the receiving hole 17g of the adjusting member (fitting) 17e, and only the adjusting member (fitting) 17e for the pitch of the plurality of bolts 18/18 # is turned to obtain the bolt 18/18 #. To stop.
[0030]
The butterfly check valve according to the present embodiment is configured as described above. Therefore, when water is not flowing in the valve box 10, the valve shaft 14 is suppressed by the urging force of the torsion coil springs 15 and 15a, and the flow path is closed. The valve 13 is pushed open against the urging force 15a. When the water supply device is stopped or other valves in the flow path are closed, the torsion coil springs 15 and 15a act to rotate the valve shaft 14 and actuate the valve element 13 to open the flow path. It will be closed.
[0031]
【The invention's effect】
The butterfly check valve according to the present invention is constructed and operates as described above. Therefore, since the rotating means does not drift to the fluid (water) and the movable parts do not expose to the outside of the valve box, safety measures such as a protective fence and a protective cover are not required, and a water supply such as a pump is provided. Since the closing time can be adjusted without interrupting the operation of the device, the characteristics of the butterfly check valve against the water hammer phenomenon, particularly the eccentric butterfly check valve, are further enhanced. ing.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a butterfly check valve embodying the present invention.
FIG. 2 is a side view.
FIG. 3 is an enlarged view of a rotating unit.
FIG. 4 is a front sectional view showing a second embodiment.
FIG. 5 is a side view.
FIG. 6 is an enlarged view of a rotating unit.
[Explanation of symbols]
Reference Signs List 10 valve box 10c joining flange 10d joining flange 11a joining flange 11b joining flange 12 valve seat 13 valve body 13a boss 14 valve shaft 14a concave groove 15 torsion coil spring 15a torsion coil spring 16 rotation drive shaft 16a projection 16b fitting hole 16c receiving hole 16d rotation Drive shaft 16e Projection 16f Flange 16g Receiving hole 17 Adjusting member (metal fitting)
17a Flange 17b Columnar projection 17c Medium diameter portion 17d Receiving hole 17e Adjusting member (metal fitting)
17f Projection 17g Receiving hole 17h Plug 18 Bolt 19 Sealing material 20 Sealing material 21 Casing 22 Bearing 23 Pin 24 Bolt 25 Bearing

Claims (10)

A butterfly type check valve, wherein a rotating means acting by torsional torque is connected to at least one end of a valve shaft at a position outside the valve box. The butterfly type check valve according to claim 1, wherein the valve shaft is provided at an eccentric position with respect to the valve body. The butterfly check valve according to claim 1 or 2, wherein a torsion coil spring is used as the rotating means. The above-mentioned rotating means is connected to a concave groove or a protrusion formed on one end surface of the valve shaft by fitting a projection or a concave groove formed on one end of the rotary drive shaft into a fitting, and is formed on the other end of the rotary drive shaft. One end of the adjustment member is fitted into the hole, and each end of the torsion coil spring is fitted into the receiving hole formed in the rotary drive shaft and the adjustment member, and the adjustment member is fixed to a part of the valve box. The butterfly check valve according to claim 1, 2 or 3, wherein: The butterfly type check valve according to claim 4, wherein the adjustment member has a fastening flange integrally, and the flange is fastened with a plurality of bolts. The above-mentioned rotating means has a rotary drive shaft inserted through one side of the casing, and has a protrusion or a concave groove formed on a protruding end face of the rotary drive shaft. Each end of the torsion coil spring is fitted in a receiving hole formed in the other end of the rotary drive shaft and an adjusting member for closing the other side of the casing. The butterfly check valve according to claim 1, 2 or 3, wherein The butterfly type check valve according to claim 6, wherein the protruding portion of the rotary drive shaft is inserted into a bearing. 8. The butterfly according to claim 6, wherein the rotary drive shaft has a flange integrally formed at a portion inside the casing, and a receiving hole of the torsion coil spring is formed in the flange. Type check valve. 9. The butterfly check valve according to claim 6, wherein the adjusting member covers the opening of the casing like a lid and is fixed with a plurality of bolts. 10. The butterfly check valve according to claim 6, wherein the casing is fixed to a part of the valve box with bolts.

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