JPH0515663Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a butterfly valve that has fluid inlets and outlets in three directions and separates or mixes flow using a single valve body. This valve is suitable for use as a switching valve in a pipeline through which gas such as gas or powder such as flour or resin raw material flows.

[Conventional technology]

As shown in FIG. 7, a conventional three-way valve is constructed by joining two butterfly valves 1 and 2 and a T-pipe 3, and a drive device 4 for one butterfly valve 1 is used.
The valve stem 5 of the other butterfly valve 2 is connected by an appropriate connecting means 6 to drive the two butterfly valves in conjunction with each other, or as shown in FIG. It is constructed using a combination of a valve 7 and an elbow-shaped valve 8.

Further, as shown in FIGS. 9a and 9b, a valve shaft 13 is rotatably installed in the center of a main body 12 having openings 11, 11 protruding from four sides in a cross shape. Valve seat protrusions 14, 14 are provided to protrude diagonally across the inside of the main body 12 while intersecting at the bearing part, and the valve shaft 1
3 is fixed with an elliptical butterfly 15 whose outer side contacts the valve seat protrusions 14, 14 every time it rotates 90 degrees,
A switching valve that allows the butterfly 15 to rotate fully relative to the main body 12 has already been devised. (Jikōsho 38
(Refer to Publication No. 3964) In the figure, 16 is a hard rubber lining layer, 17 is a manual opening/closing handle, and 18 is a hard rubber lining layer.
is a guideline.

[The problem that the idea aims to solve]

In the conventional example shown in FIGS. 7 and 8 above, the fluid passage area near the valve body is narrow, and there are sudden changes in flow, resulting in extremely large fluid resistance. The function and performance of valves that function as control valves for such purposes have been reduced. Furthermore, these have problems in that they have a large installation area, are not economical in terms of materials, weight, and price, and go against the recent trend toward miniaturization of various plants and equipment.

Further, the conventional example shown in FIGS. 9a and 9b has the following problems.

(i) If the valve body 15 is not oval, the entrance/exit (bore)
A point that does not fall below 11.

(ii) In order to provide reliable sealing, which is an important element for a switching valve, the elliptical valve plate 15 and main body 1 are
The point is that there is no specificity as to how to process the inside of 2.

(iii) For the above reasons, the outer diameter of the valve body and the inner diameter of the main body cannot be processed, so a rubber lining layer 16 is provided, but the dimensional accuracy is uncertain without processing.

The present invention aims to solve the drawbacks and problems of the conventional example described above, and reduces the overall shape of a three-way valve, reduces fluid resistance, and improves operability as a control valve. The technical challenge is to ensure a reliable seal when the valve is closed.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a three-way butterfly valve in which a valve body is provided in a main body having fluid inlets and outlets in three directions to switch the flow path. Consisting of a disc-shaped valve body with a perfect circular outer diameter and supported by a penetrating valve stem, the main body is divided into two in a direction perpendicular to the valve stem, and the diameter is equal and A sealing member made of an elastic body, in which a valve seat is provided at each peripheral edge including the intersection of the T-shaped fluid inlets and outlets in the three directions, and a contact surface is formed in a spherical shape on the peripheral edge of the valve seat or valve body. The outer diameter of the valve body is at least 1.5 times the inner diameter of the fluid inlet and outlet, allowing for separate or mixed flow.

[Effect]

In this invention, as mentioned above, the main body (valve main body) is divided into upper and lower halves perpendicular to the valve stem, so machining of the inner surface of the main body can be easily performed, and the inner surface of the main body (inner diameter) By machining the outer periphery of the valve body (outer diameter), the curved surfaces of both valve bodies can be machined to closely match each other, so that reliable sealing performance can be ensured.

Therefore, any two of the three ports can be switched to communicate with each other by rotating the valve body, so for example, depending on the pipeline, it is possible to change a branched flow to a mixed flow or a mixed flow to a divided flow. It is possible.

Furthermore, by making the outer diameter of the valve body larger than the diameter of the main body inlet and outlet, the flow velocity is reduced, fluid resistance is improved, and wear resistance and damage are prevented.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is an internal side view of a three-way mouth butterfly valve according to an embodiment of the present invention, seen from the dividing surface, showing the state in which it is used as a separation valve, and Fig. 2 is a side view of the same, showing the state in which it is also used as a mixed flow valve. , FIG. 3 is a front view as well.

In the figure, a main body (valve main body) 20 has entrances and exits 21, 22, and 23 on three sides, and a valve seat 24 is formed at the peripheral edge including the intersection of each of these entrances and exits.
A valve body 25 is rotatably supported by a valve rod 26 so as to abut against these valve seats 24 .

As shown in FIG. 4a, the valve body 25 is configured to be able to come into pressure contact with an elastic body 27 as a sealing material attached to the valve seat 24 portion of the main body 20. Note that instead of attaching the elastic sealing material 27 to the valve seat 24 of the main body 20, an elastic body 28 can be attached to the tip of the valve body 25, as shown in FIG. 4b.

The outer peripheral surface of the valve body 25, the main body 20 and the valve seat 24
The inner surfaces of both are processed into spherical surfaces, and a sealing means made of elastic bodies 27 and 28 is attached to one of them as described above, so that reliable sealing performance can be obtained.
The fluid flows reliably in a defined channel and cannot flow in the other direction. In addition, in the figure, 26a is a taper pin that attaches the valve body 25 to the valve stem 26, and 29
A is a bolt/nut for fixing the main body 20 divided into two parts, 30A is a gasket, and a driver (not shown) is attached to the top of the valve stem 26.

Further, both the upper and lower ends of the valve body 25 in the valve stem axial direction and the vicinity of the valve stem 26 penetrating portion of the main body 20 are formed into flat surfaces, and sealing means (not shown) is applied to these flat portions.

Next, to explain the operation, when the three-way butterfly valve is used in the state shown by the solid line in FIG.
Fluid flows from ports 21 to 22. Further, when the valve body 25 is rotated to the state shown by the two-dot chain line, the flow path is formed from the inlet and outlet ports 21 to 23, and the flow is divided in the direction shown by the large arrow.

Also, when used in the solid line state in Figure 2,
A flow path is formed from the ports 22 to 21, and the fluid flows from the ports 22 to 21. Also, when the valve body 25 is rotated to the state shown by the two-dot chain line, the flow path is
3 to 21, and the mixed flow (mixing) occurs in the direction indicated by the large arrow.

In addition, the valve body 2 is
Since the outer diameter of 5 is set to be 1.5 times or more, the flow velocity within the main body 20 is slowed down, thereby making it possible to prevent wear and damage. Further, since the outer periphery of the valve body 25 is always seated on the valve seat 24 when the fluid passes through, there is no damage to the outer periphery of the valve body 25.

In addition, the valve stem 26 is sealed by the sealing means of the planar contact portions with the valve body at the upper and lower ends of the valve body 25 in the valve stem axial direction.
Leakage along the line is prevented.

Modifications (concrete examples) of the sealing means of the flat contact portions at the upper and lower ends in the axial direction of the valve stem are shown in FIGS. 5 and 6. FIG. 5 shows a sealing elastic body 2 on the inner surface of the main body 20.
Gland O-ring case 29 when 7 is installed
FIG. 6 is a sectional view of a main part of an embodiment in which an O-ring 30 is fitted into the valve body 25, and FIG. , FIG. 6a is an enlarged sectional view of part B. Note that the material of the O-ring case 29 is stainless steel.

[Effect of idea]

As described above, according to the present invention, the main body having fluid inlets and outlets in three directions is divided into two in the direction perpendicular to the valve stem, and a valve seat is formed on each peripheral edge including the intersection of the fluid inlets and outlets, and The divided inner surface of the main body or the valve seat is formed into a spherical shape, the valve body is formed into a disk shape with a perfect circle outside diameter, and the abutment surface on the peripheral edge of the valve body or the valve seat is formed into a spherical shape. By installing the sealing elastic body and making the outer diameter of the valve body 1.5 times or more the inner diameter of the fluid inlet and outlet, the following effects are achieved.

(i) The curved part of the flow path is inclined at 45 degrees by the valve body, and since the degree of curvature of the flow path is small, the fluid resistance is small, and there is almost no damage or resistance to the valve.

(ii) It has fewer components, is miniaturized to within a predetermined size, and is easy to attach to a pipeline, and is easy to assemble and disassemble.

(iii) Since a sealing elastic body is attached to the inner surface of the main body or the outer periphery of the valve body, reliable flow separation and mixed flow can be performed.

(iv) Since the main body is divided into two parts, it is easy to process the inner surface of the main body into a spherical surface, which, together with the precise machining of the circumferential surface of the disc-shaped valve body into a perfect circle, improves the sealing performance of the valve body. In addition, only half of the valve can be disassembled without having to remove the entire valve from the pipeline, making internal inspection possible. In particular, since it has a three-way opening, the pipe has three prongs (three intersections), which is convenient for line maintenance.

(v) Diversion into mixed flow due to pipeline circumstances;
Alternatively, it is possible to change the mixed flow to a separate flow.

(vi) Since there is no resistance in the flow path and the outer diameter of the valve body is large, the flow velocity within the main body is slow, pressure loss is small, and there is no damage or wear to the valve body.

[Brief explanation of the drawing]

1 and 2 are internal side views showing different usage states of a three-way mouth butterfly valve showing an embodiment of the present invention, FIG. 3 is a front sectional view, and FIGS. Enlarged explanatory diagram of part A, Figures 5 and 6
The figure is a sectional view of the main part showing a modified embodiment, and Figure 6a is B
The enlarged views of FIGS. 7 to 9a and 9b show conventional examples, and FIG. 9b is a sectional view taken along the line bb--b of FIG. 9a. 20... Main body, 21, 22, 23... Doorway,
24... Valve seat, 25... Valve body, 26... Valve stem, 2
7, 28...Elastic body for sealing, 29...Gland O
Ring case, 30...O ring.

Claims (1)

[Scope of utility model registration request] In a three-way butterfly valve in which a valve body is provided with a valve body having fluid inlets and outlets in three directions to switch the flow path, the valve body is pivoted on a valve stem that passes through the center of the body, and the outer diameter is a perfect circle. The main body is divided into two in the direction perpendicular to the valve stem, and the fluid inlets and outlets in the three directions are equal in diameter and formed in a T-shape. A valve seat is provided on the periphery including the intersection point, and a sealing member made of an elastic body with a spherical contact surface is attached to the valve seat or the periphery of the valve body, and the outer diameter of the valve body is set to the fluid inlet/outlet. A three-way butterfly valve characterized by having a diameter that is at least 1.5 times the inner diameter of the valve, and is capable of dividing or mixed flow.