JP6468664B2 - Butterfly valve - Google Patents

Description

  The present invention relates to a butterfly valve which closes a pipe line in a closed state and opens the pipe line by rotating from the closed state around a valve rod.

  2. Description of the Related Art Conventionally, there is a butterfly valve that switches between closing and opening of a pipeline by rotating a valve body around a valve stem. In the butterfly valve, the flow rate between the flow path on the orifice side and the flow path on the nozzle side, which is formed by opening the valve body, can be different. Therefore, for example, as disclosed in Patent Document 1, there is a butterfly valve in which a resistor protruding from the valve body toward the downstream side is provided on the nozzle side of the valve body. In this butterfly valve, the resistor suppresses the difference in flow rate between the orifice-side flow path and the nozzle-side flow path, and as a result, the occurrence of cavitation is suppressed. This also reduces the volume of noise generated when fluid flows through the conduit.

JP 2012-82932 A

  However, even the butterfly valve described in Patent Document 1 does not provide a sufficient noise volume reduction effect.

  An object of the present invention is to provide a butterfly valve having a lower noise volume when fluid flows.

  In order to solve the above-mentioned problems, a butterfly valve according to the present invention is arranged in a pipe line, a valve rod orthogonal to the pipe line, and disposed in the pipe line, and is rotatable about the valve rod as a rotation shaft. A valve body, a seat ring that is fixed to an inner periphery of the pipe line, and in liquid-tight contact with the valve body when the valve body is in a predetermined rotation position, and the pipe line on the downstream side of the seat ring And a water conduit that connects a first opening, which is an opening provided in the pipe, and a second opening, which is an opening provided in the pipe line, on the downstream side of the first opening.

  According to this configuration, it is possible to reduce the noise volume when the liquid flows through the pipeline as compared with the configuration without the water conduit.

  The butterfly valve protrudes from the nozzle side end of the valve body toward the downstream side when the valve body is in the predetermined rotation position, and has an outer surface with a predetermined radius from the rotation axis of the valve stem. It is preferable to further include a resistor.

  According to this configuration, the flow rate unbalance between the orifice side and the nozzle side can be suppressed, and the occurrence of cavitation can be suppressed. As a result, the noise volume when the liquid flows through the conduit can be reduced, and the noise volume can be further reduced in combination with the effect of reducing the noise volume by the water conduit.

  The bypass rod is preferably provided on both sides of the nozzle side and the orifice side.

  According to this configuration, it is possible to further reduce the noise volume when the liquid flows through the pipeline.

  The valve stem may be positioned downstream of a sealing surface that is a virtual plane including the seat ring.

  According to this configuration, the gap between the valve body and the seat ring opens later on the nozzle side than on the orifice side, or the gap on the orifice side opens larger than the nozzle side. Therefore, the flow rate unbalance between the orifice side and the nozzle side can be suppressed.

  As described above, according to the present invention, it is possible to reduce the volume of noise generated when the liquid flows through the pipe line when the butterfly valve is in the open state.

FIG. 1 is a cross-sectional view showing a configuration of a butterfly valve 1 according to the present invention, and shows a state in which a valve body 5 is in a closed position. FIG. 2 is a cross-sectional view showing the configuration of the butterfly valve 1 and shows a state in which the valve body 5 is in a position opened 30 degrees. FIG. 3 is a cross-sectional view showing the configuration of the butterfly valve 1 and shows a state in which the valve body 5 is in a position opened 60 degrees.

  1, 2 and 3 are cross-sectional views showing the configuration of the butterfly valve 1 according to the present invention. FIG. 1 shows a state in which the valve body 5 is in the closed position, and FIG. 2 shows that the valve body 5 is opened 30 degrees. FIG. 3 shows a state in which the valve body 5 is in a position opened 60 degrees.

  As shown in FIG. 1, the butterfly valve 1 includes a conduit 2, a valve stem 3, a valve stem holder 4, a valve body 5, a resistor 6, a seat ring 7, a first water guide pipe 8, and a second water guide pipe 9. It has.

  The pipe line 2 is a cylindrical pipe, and a fluid flows through the inside. The butterfly valve 1 is a valve for opening and closing the middle of the pipe line 2 to stop the flow of liquid or to adjust the flow rate.

  The valve rod 3 has a rod shape and extends in a direction orthogonal to the pipe line 2. Both ends of the valve stem 3 are fixed to the inner surface of the pipe 2.

  The valve stem holder 4 holds the valve stem 3 in a rotatable manner.

  The valve body 5 has a disc shape, and one surface of the disc shape is fixed to the valve stem holding portion 4. Thereby, the valve body 5 is rotatable about the valve stem 3 as a central axis. The size of the outer circumference of the circle of the valve body 5 is slightly smaller than the circular shape of the inner surface of the pipe line 2 orthogonal to the pipe line 2.

  The valve body 5 is eccentric to the upstream side of the pipe line 2 with respect to the valve rod 3. Such a butterfly valve 1 is referred to as a single eccentric butterfly valve.

  The seat ring 7 has an annular shape and is formed of an elastic body such as rubber. The seat ring 7 is on a virtual plane (hereinafter referred to as “seal surface 20”) orthogonal to the axial direction of the pipe line 2, and the butterfly valve 1 shown in FIG. 1 is in a closed position (a predetermined rotation position). In a state (hereinafter referred to as a “closed state”), the valve body 5 is disposed at a position in contact with the circumferential edge of the valve body 5 and fixed to the inner surface of the conduit 2.

  The resistor 6 has a shape protruding on the upstream side from the valve body 5 in the closed state of the valve body 5 on the nozzle side of the valve body 5. The outer surface 6 a on the nozzle side of the resistor 6 is along a virtual arc centered on the rotation axis of the valve stem 3. Further, in the state shown in FIG. 3, the outer surface 6 a is rotated by the valve rod 3 so that a gap formed between the outer surface 6 a and the inner peripheral surface of the pipe line 2 is constant in the circumferential direction of the pipe line 2. It also has an arc shape in the direction of the dynamic axis. The radius of the outer surface 6 a centered on the pivot axis of the valve stem 3 is slightly smaller than the radius of the circumferential edge of the valve body 5 centered on the pivot axis of the valve stem 3.

  The pipe line 2 has two openings 11 and 12 on the orifice side (upper side in FIGS. 1 to 3) and two openings 13 and 14 on the nozzle side (lower side in FIGS. 1 to 3) on the downstream side of the seat ring 7. Have. The opening 11 and the opening 12 are arranged along the axial direction of the pipe line 2, and the opening 12 is located on the downstream side of the opening 11. Further, the opening 13 and the opening 14 are arranged along the axial direction of the pipe line 2, and the opening 14 is located on the downstream side of the opening 13.

  The first water guide pipe 8 is a circular tube, and is arranged so that the opening 11 and the opening 12 communicate with each other from the outside of the pipe line 2. The second water guide pipe 9 is a circular tube, and is arranged such that the opening 13 and the opening 14 communicate with each other from the outside of the pipe line 2.

  As shown in FIG. 1, the valve body 5 is located on the seal surface 20 along the seal surface 20 in the closed state of the butterfly valve 1. In this state, the circumferential edge of the valve body 5 is in liquid-tight contact with the seat ring 7. Thereby, in the closed state of the butterfly valve 1, the flow of the liquid which flows through the pipe line 2 from the left side to the right side in FIGS.

  When the valve body 5 is rotated counterclockwise in FIG. 1 from the position of the valve body 5 shown in FIG. 1, the valve body 5 is in the open position (hereinafter referred to as “open state”).

  In the open state of the butterfly valve 1 shown in FIGS. 2 and 3, the liquid flowing through the pipe line 2 flows from the flow paths 21 and 22 which are gaps between the circumferential edge of the valve body 5 and the seat ring 7. In FIG. 3, since the flow paths 21 and 22 are larger than those in FIG. 2, more fluid flows through the pipeline 2.

Next, the measurement result of the noise volume when the liquid flows through the pipe line 2 in the open state of the butterfly valve 1 in the case where the first water conveyance pipe 8 and the second water conveyance pipe 9 are provided or not provided is shown. .
<Example 1>

The noise during drainage was measured when the butterfly valve according to the present invention described in the above embodiment was used as a float valve. A CUSTOM digital sound level meter SL-1320 was used for the measurement. Note that the float valve, keep floating float on the water surface in the tank, the valve body lever being come in contact on the float when the water level drops is actuated is drained open the float becomes a constant level It is a valve that lifts and pushes the lever and closes the valve body.

As a measurement method, the water level and the amount of noise at a plurality of times in one drainage from the tank were recorded as measurement results. The measurement results of Example 1 are shown in Table 1.
<Comparative Example 1>

  In the above-described embodiment, noise during drainage was measured when a conventional butterfly valve that did not include the first water conduit 8 and the second water conduit 9 was used as a float valve. The measurement method was the same as in Example 1. The measurement results of Comparative Example 1 are shown in Table 1.

  From the results shown in Table 1, when using the butterfly valve 1 according to the present invention shown in the results of Example 1, compared to the butterfly valve using the prior art shown in the results of Comparative Example 1, the pipeline It can be seen that the noise volume when the water flows through is reduced.

  As described above, the butterfly valve 1 includes a valve rod 3 that is orthogonal to the axial direction of the pipe line 2 in the pipe line 2 and a valve that is disposed in the pipe line 2 and that can turn around the valve bar 3 as a pivot shaft. Body 5, seat ring 7 that is fixed to the inner periphery of pipe 2 and is in fluid-tight contact with valve body 5 when valve body 5 is in a predetermined rotational position, and a pipe line downstream of seat ring 7. A first water guide pipe 8 that connects a first opening 11 that is an opening provided in 2, and a second opening 12 that is an opening provided in the pipe line 2 on the downstream side of the first opening 11, and a seat ring 7. A second conduit for connecting the first opening 13, which is an opening provided in the pipe 2 on the downstream side, and the second opening 14, which is an opening provided on the pipe 2 on the downstream side from the first opening 13. 9.

  Therefore, compared with the structure which is not provided with the 1st water conduit 8 and the 2nd water conduit 9, the noise volume when a liquid flows through the pipe line 2 can be reduced.

  This is presumably because the flow velocity of the liquid passing through the valve body 5 is weakened by the liquid passing through the first water guide pipe 8 and the second water guide pipe 9 being jetted into the pipe 2.

  The butterfly valve 1 protrudes from the nozzle side end of the valve body 5 toward the downstream side in the closed state of the valve body 5, and has a resistor 6 having an outer surface 6 a having a predetermined radius from the rotational axis of the valve rod 3. Further prepare.

  Therefore, the flow rate imbalance between the orifice side and the nozzle side can be suppressed, and the occurrence of cavitation can be suppressed. As a result, the noise volume when the liquid flows through the pipe line 2 can be reduced, and the noise volume can be further reduced in combination with the noise volume reduction effect of the first water conduit 8 and the second water conduit 9. Can do.

  Since the first water guide pipe 8 is provided on the orifice side and the second water guide pipe 9 is provided on the nozzle side, the water guide pipe is provided on both sides of the nozzle side and the orifice side.

  Therefore, the noise volume when the liquid flows through the pipe line 2 can be further reduced.

  The valve stem 3 is located downstream from the seal surface 20.

  Therefore, the gap between the valve body 5 and the seat ring 7 opens later on the nozzle side than on the orifice side, or the gap on the orifice side opens larger than the nozzle side. Therefore, the flow rate unbalance between the orifice side and the nozzle side can be suppressed.

  While one embodiment of the present invention has been described above, the present invention can be implemented in other forms.

For example, in the above-described embodiment, the butterfly valve 1 is a single eccentric butterfly valve in which the valve body 5 is eccentric to the upstream side of the pipe line 2 with respect to the valve rod 3, but the butterfly valve 1 is The valve body 5 may be a butterfly valve that is not eccentric with respect to the valve stem 3, or the valve body 5 is a double that is eccentric with respect to the valve stem 3 in both the axial direction and the radial direction of the pipe line 2. An eccentric butterfly valve may be used.

Further, in the above embodiment, although both sides water introduction pipe orifice side and the nozzle side (the first water guide pipe 8 second water guide pipe 9) are provided, the water guide on one of the orifice side and the nozzle side A pipe may be provided. Further, three or more water guide pipes may be provided.

  The inner diameter of the water guide pipe is not particularly limited. When the number of water guide pipes is increased, there is a possibility that the noise volume can be suppressed even if the inner diameter of the water guide pipe is made smaller. When a plurality of water guide pipes are provided, the inner diameters of the water guide pipes may be different. The number and inner diameter of the water guide pipes can be set so as to increase the noise volume effect by experiment and theory.

  In the above-described embodiment, the pipe line 2 has a cylindrical shape, but may have a cylindrical shape other than the cylindrical shape, for example, a cylindrical shape such as a square cross section. In this case, the shape of the valve body 5 is not a disk shape, but may be a shape such as a square flat plate that matches the inner peripheral shape of the pipe line 2.

In the above embodiment, the first water guide pipe 8 and the second water guide pipe 9 are along the axial direction of the pipe line 2, but are not necessarily along the axial direction of the pipe line 2. The first water guide pipe 8 and the second water guide pipe 9 may be disposed obliquely with respect to the axial direction of the pipe line 2.
In addition, the resistor 5 and the valve body 5 do not have to be formed integrally, and the resistor 5 may be configured separately from the valve body 5 and fixed to the valve body 5.

  Moreover, if the valve body 5 is a structure which can be rotated with respect to the pipe line 2, the valve body 5 may adhere to the valve rod 3, and the valve rod 3 may be hold | maintained at the pipe line 2 so that rotation is possible. The valve rod 3 may be fixed to the pipe 2 and the valve body 5 may be held by the valve rod 3 so as to be rotatable.

  The configuration included in the butterfly valve 1 is arbitrary, and the water guide pipes (the first water guide pipe 8 and the second water guide pipe 9) are not included in the configuration of the butterfly valve 1, and the water guide pipe is connected to the pipe line to which the butterfly valve is attached. Even a configuration provided with is included in the present invention.

DESCRIPTION OF SYMBOLS 1 Butterfly valve 2 Pipe line 3 Valve rod 4 Valve rod holding | maintenance part 5 Valve body 6 Resistor 6a Outer surface 7 Seat ring 8 1st water conduit (water conduit)
9 Second water pipe (water pipe)
11 Opening (first opening)
12 opening (second opening)
13 opening (first opening)
14 Opening (second opening)
20 Seal surface

Claims (3)

A valve stem perpendicular to the pipe in the pipe;
A valve body that is disposed in the pipe and is rotatable about the valve rod as a rotation axis;
A seat ring that is fixed to the inner periphery of the conduit and that comes into liquid-tight contact with the valve body when the valve body is in a predetermined rotational position;
A first water conduit connecting a first opening, which is an opening provided in the pipe line, on the downstream side of the seat ring, and a second opening, which is an opening provided in the pipe line, on the downstream side of the first opening. A first connecting the flange and a third opening, which is an opening provided in the conduit downstream of the seat ring, and a fourth opening, which is an opening provided in the conduit downstream of the third opening. 2 water conduits ,
It said first water conduit is provided an orifice side, the second water conduit is a butterfly valve that is provided on the nozzle side which faces the orifice side. A resistor that protrudes from the nozzle side end of the valve body toward the upstream side in a state where the valve body is in the predetermined rotation position and has an outer surface of a predetermined radius from the rotation axis of the valve rod; The butterfly valve according to claim 1, further comprising:   3. The butterfly valve according to claim 1, wherein the valve stem is located downstream of a sealing surface that is a virtual plane including the seat ring.

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