JP2832103B2 - Anti-condensation butterfly valve and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve, and more particularly to a butterfly valve having a dew condensation preventing function and a method of manufacturing the same.

[0002]

2. Description of the Related Art As is well known, a butterfly valve has a valve body provided so as to open and close a flow path by performing a swirling motion in a main body, and the other end of a valve shaft having one end connected to the valve body. Has a structure that is led out to the outside through the valve shaft insertion portion and the valve shaft insertion neck portion of the main body, and is connected to the driving portion.In general, the main body having the valve shaft insertion portion and the insertion neck portion are made of the same material. It is integrally cast.

[0003] Such a casting is easy to manufacture,
Further, there is an advantage that the fluid can be used for any fluid as long as the quality is stable and the rubber sheet in contact with the valve body can withstand.

However, when used in a cold or hot water pipe for air conditioning or the like, it is necessary to provide an adiabatic insulation coating on the pipe and valve in order to prevent the occurrence of dew condensation when passing through the cold water, heat radiation of the cold and hot water, and energy loss due to heat absorption. However, the heat insulation coating of the valve shaft insertion neck portion and the valve drive portion was relatively difficult due to the complicated shape.

As one means for solving such a problem, Japanese Patent Laid-Open Publication No. Hei 3-161691 discloses that a base portion of a valve stem through which a valve shaft is inserted is formed integrally with a main body, and the remaining portion in the outer direction is made of a heat-insulating material. There has been proposed a butterfly valve structure which is formed of a metal material such as hard vinyl chloride or polyethylene to prevent dew condensation.

[0006]

That is, in the above proposal, the outer portion of the valve stem is formed of a heat-insulating non-metallic material so that the outer portion of the valve stem is thermally isolated from the base. However, the valve stem base of the valve body made of a metal material and the outer portion of the valve stem made of a non-metallic material, that is, plastic, have to be separately molded and connected, There is a drawback that the number of processes is increased, and since it is inevitable to use an adhesive method, it is necessary to pay careful attention to quality control in a connected state of both, and the necessity of maintenance and inspection also increases.

Therefore, the object of the present invention is to:
An object of the present invention is to provide a butterfly valve which prevents dew condensation at a valve shaft insertion neck portion and a valve driving portion of a butterfly valve, and does not require a heat insulating coating on a driving portion.

Another object of the present invention is to provide a butterfly valve of this kind which does not increase the number of manufacturing steps.

Still another object is that the connection between the valve shaft insertion neck and the main body is integrated,
The purpose of this invention is to provide a butterfly valve of this kind which is reliable in durability.

It is another object of the present invention to provide a method for manufacturing such a butterfly valve.

[0011]

To achieve the above object, according to an aspect of, in the present invention, one end portion connecting the flow path to the valve body provided openably in the main body, and deriving the other end to the outside the insertion neck portion of the valve shaft connecting the drive unit, the thermal conductivity
And it is one of the features that a metallic pipe made of sexual bad austenitic stainless steel.

[0012] body having a valve shaft insertion portion, the Osute
Aluminum, which has a lower melting point than
Shall cast I, and the other, characterized in that integrally molded both by casting to the valve shaft insertion portion so as to go enfold insertion neck made the metal pipe at the time of casting.

That is, in the butterfly valve according to the present invention, one end is connected to a valve body having a flow passage openable and closable in a main body, and the other end is led out to connect to a driving portion. Use the austenitic stainless steel with poor thermal conductivity
Stainless steel pipe material, and this insertion neck
Aluminum insert binding neck for insertion
A dew-prevention butterfly valve, which is integrally cast into a valve shaft insertion portion of a body .

In this case, the peripheral surface of the casting portion of the insertion neck portion
In addition, if irregularities for detent and retaining are formed,
A more reliable casting state can be obtained.

Further, the other end of the valve shaft, one end of which is connected to the above-mentioned butterfly valve, ie, a valve body provided with a flow passage openable and closable in the main body, is led out to the outside through a valve shaft insertion portion and an insertion neck portion. as a method for producing condensation prevention butterfly valve so as to to coupled to the drive, the insertion neck portion of the valve shaft, and molded into <br/> pipe shape with low thermal conductivity austenitic stainless steel, aluminum Has a valve shaft insertion part
When the main body is cast, a manufacturing method in which the insertion neck portion is integrally cast so as to be embraced by the valve shaft insertion portion can be adopted.

[0016]

As described above, the heat conduction through the neck portion of the valve shaft
When a metal pipe made of austenitic stainless steel having poor properties is used, the dew condensation phenomenon at the insertion neck portion and the driving portion can be prevented, so that the heat insulating coating of the driving portion can be omitted. In addition, accidents such as dropping of water droplets due to condensation can be prevented.

The insertion neck portion and the valve shaft insertion portion are both made of a metal material and are integrated at the time of casting the main body, so that the connection between them is reliable, good, and excellent in durability.

As a manufacturing method, since it can be integrated at the time of casting of the main body, there is no increase in the number of steps, and the manufacturing method can be made reliable in terms of durability.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 is a cross-sectional view showing an embodiment of a butterfly valve according to the present invention. 1 is a cast main body, 2 is a rubber seat ring attached to the inner surface of the main body, and 3 is provided rotatably in the main body. A valve body that opens and closes the flow path by pressing and separating the peripheral edge portion from and against the seat ring 2;
Is a stem for receiving the valve body, 5 is connected at one end to the valve body 3,
The other end is a valve stem inserted through the valve stem insertion portion 6 formed in the main body 1 and the valve stem insertion neck portion 7 integrally connected to the valve stem insertion portion 6, and is connected to the driving portion at the upper end portion. You. 8 is a split bush, 9 is a flange, 10 is a set screw, 11 is an O-ring, 12 is a wiring, and 13 is a bush.

The valve shaft insertion neck 7 has poor heat conductivity.
Austenitic stainless steel molded into a pipe
And is integrated with the valve shaft insertion portion 6 of the main body 1 cast from aluminum having a lower melting point .

Since the valve shaft insertion neck portion 7 is integrally cast into the valve shaft insertion portion 6 at the time of casting the main body 1 as described above, the valve shaft insertion portion 6 is securely embraced by the valve shaft insertion portion 6, and the tight and secure connection is ensured. Although a state can be obtained, in order to obtain a more reliable casting state, it is preferable to form a deformed portion 14 in the lower part as shown in FIG. Further, as shown in FIGS. 3 and 4, it is conceivable to form the uneven portion 15 on the peripheral surface. Of course, deformed parts,
The shape of the concavo-convex portion is not limited to those described above. In other words, any shape may be used as long as it can reliably prevent rotation and retainment in the cast state, and various shapes may be employed.

When manufacturing such a butterfly valve, the insertion neck 7 of the valve shaft 5 is connected to an austenitic stainless steel.
Was formed type in a pipe shape in Nresu steel, casting body having a valve shaft insertion portion 6, the interpolation-class neck 7 to the valve shaft insertion portion 6 can be easily manufactured by casting integrally.

[0024]

As described above, in the dew condensation preventing butterfly valve according to the present invention, the neck portion for the valve shaft insertion is formed of the male member having poor heat conductivity.
Was molded into a pipe shape by chromatography stearyl night stainless steel, during the casting of the body having a valve shaft insertion portion, since the integrally cast structure to the valve shaft insertion portion insertion Spoken neck, both coupled state of
The adhesion is reliable, good and durable.
A highly reliable configuration could be achieved, and the desired function of preventing dew condensation on the target valve shaft insertion neck and the drive portion could be achieved, and the heat insulation coating on the drive portion could be eliminated. It is.

Further, when manufacturing such a butterfly valve, the neck portion for inserting the valve shaft can be cast and integrated at the same time when the main body is cast, so that the number of manufacturing steps is not increased and the durability is improved. This has the advantage that a highly effective dew-prevention butterfly valve can be manufactured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a butterfly valve for preventing dew condensation according to the present invention.

FIG. 2 shows a valve shaft insertion portion and a valve shaft insertion net of the butterfly valve .
Main part sectional view showing the connection state with the lock part

FIG. 3 is a plan view of the same.

FIG. 4 is a perspective view showing the shape of the lower end of a valve shaft insertion neck;

[Explanation of symbols]

1 ... body 3 ... valve body 5 ... valve shaft 6 ...
Valve shaft insertion part 7: Neck part for valve shaft insertion

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-181691 (JP, A) JP-A-3-199793 (JP, A) Catalog of “All-Stainless Butterfly Valve M-610 White Butterfly”, Inc. Kurimoto Iron Works, July 1988, p2 “Kubota Cast-Inseal Metatite, BS-HB Metal Sheet-Butterfly Valve” catalog, Kubota Iron Works Co., Ltd., October 1982 (58) Fields surveyed (Int. Cl. ⁶ , DB name) F16K 1/00-1/228 F16K 27/00-27/02 F16K 51/00

Claims (3)

(57) [Claims] 1. A connecting one end to the valve body having a flow path to be opened and closed in the main body, the insertion neck portion of the valve shaft connecting the drive unit to derive the other end to the outside, heat conduction Bad Oh
This insert is made of stainless steel pipe material.
The insertion neck is made of aluminum so as to embrace the passing neck
A dew-prevention butterfly valve, which is integrally cast into a valve shaft insertion portion of a nickel cast body . 2. A peripheral surface of a casting portion of the insertion neck portion is provided around the casting portion.
2. An uneven portion for stopping and retaining is formed.
Non-condensing butterfly valve . 3. The other end of the valve shaft, one end of which is connected to a valve body provided with a flow passage openable and closable in the main body, is led out to the outside through a valve shaft insertion portion and an insertion neck portion, and is connected to a driving portion. In the method of manufacturing a butterfly valve, the neck portion for inserting the valve shaft is made of an austenitic stainless steel having poor heat conductivity.
When casting a body having a valve shaft insertion portion with aluminum by casting it in a pipe shape with stainless steel, the casting neck portion is integrally cast so as to embrace the valve shaft insertion portion with the valve shaft insertion portion. Manufacturing method of prevention butterfly valve.