JP2741548B2 - Butterfly valve dew condensation prevention structure - Google Patents

Description

The operating device according to the present invention relates to a structure for preventing dew condensation of a butterfly valve disposed in a pipe of an air conditioner, and more particularly to a dew condensation on an outer surface of the operating device. The present invention relates to a dew condensation preventing structure suitable for a case in which dew water rusts an operation device or the like, dampens a heat insulating covering material of a pipe or a valve to reduce a heat insulating effect, or pollutes an environment.

(Prior art and its problems) In cold / hot piping such as air conditioners, moisture in the air condenses on the outer surfaces of pipes and valves. In general, pipes and valves are covered with thermal insulation to maintain cooling efficiency.
For this reason, since the outer surfaces of the pipe and the valve do not directly come into contact with the air, there is no condensation.

However, the valve operating device is not generally covered with the heat insulating material because the fluid does not flow through the device and the shape of the valve is complicated and the coating of the heat insulating material is troublesome.

In this case, since the temperature of the valve is low, the heat of the operating device is taken away through the mounting surface to the valve, the temperature of the operating device is lowered, and dew condensation may occur on the outer surface thereof. The condensed water causes rust on the operating device, flows to the valve, penetrates and infiltrates the insulation covering the valve and the insulation covering the piping, and drives out the air inside the insulation to reduce the insulation effect. Let it. Further, there is a problem that dew condensation water, particularly rust-containing red water stains floors and the like, and deteriorates the environment.

The present invention is intended to solve these problems and to provide a structure for preventing condensation of a butterfly valve which is easy to manufacture and mount, and is covered with an effective molded heat-insulating housing.

The operating device mentioned here includes not only a manual operating device such as a gear type but also a pneumatic type, a hydraulic type, and other automatic operating devices.

(Means for Solving the Problems) In order to achieve the above object, the present invention mounts an operating device for opening and closing a valve on a mounting flange of a butterfly valve, and substantially includes the operating device and a lower surface of the mounting flange. The entire outer surface was covered with a molded heat-insulating housing formed of a heat insulating material such as styrene foam or glass wool so as to surround the operation device and the lower surface of the mounting flange.

In this case, it is preferable that the molded heat-insulating housing is divided into two or more and joined.

Also, it is preferable that the double-sided adhesive tape is sandwiched between the joining surfaces of the molded heat-insulating housings for joining, and that the joint surfaces of the molded heat-insulating housings are uneven surfaces that fit together. Preferably, all or part of the molded heat-insulating housing is formed by inverting one of the pair of molded heat-insulating housings having the same shape and joining the other to the other.

Further, it is preferable to provide a concave portion on the mounting surface of the device main body to the valve or the mounting surface of the valve for mounting the device main body.

According to another invention, an operating device for opening and closing a valve is mounted on a mounting flange of a butterfly valve, and almost the entire outer surface including the lower surface of the operating device and the mounting flange is formed of a heat insulating material such as styrene foam or glass wool. Covering the operating device and the lower surface of the mounting flange by covering with a molded heat insulating casing, and surrounding a portion connecting this molded heat insulating casing and the heat insulating coating applied to the butterfly valve with a molded heat insulating cylinder. This is a dew condensation preventing structure of the butterfly valve which prevents dew condensation at the connection portion.

(Operation) Therefore, according to the present invention, since almost the entire outer surfaces of the operating device and the mounting flange are first closely adhered and covered with a heat insulating material such as styrene foam or glass wool, air is directly applied to the outer surface of the operating device and the mounting flange. There is no touch, and therefore, even if the operating device is deprived of heat by the fluid via the valve and has a low temperature, there is no condensation.

For this reason, the operating device and other equipment do not rust due to the dew condensation water, and the heat insulating covering material of the valve and the piping does not suck the dew water and reduce the heat insulating effect.

Furthermore, dew condensation water, especially water stained with rust, does not flow to the floor or the like, and does not deteriorate the floor surface or other environments.

In this case, if the covering of the operating device and the mounting flange is joined and wrapped around the device main body with a molded heat-insulating housing portion such as styrene foam divided into two or more pieces, the covering operation is easy, and the dew condensation preventing effect is improved. Good.

The work is further facilitated by joining the molded heat-insulated housing by sandwiching the double-sided adhesive tape between the joining surfaces.

Furthermore, if the joining surfaces of the molded heat-insulating housings are joined to each other with the uneven surfaces fitted to each other, the relationship between the portions can be joined correctly, and the joining is further strengthened.

Further, when all or a part of the molded heat-insulating housing is formed by joining one side of a pair of the same-shaped formed heat-insulating housing upside down to the other, the molded heat-insulating housing is molded. The number of types of molds to be formed and the types of portions of the molded heat-insulating housing are reduced, which is more economical.

Further, by providing a concave portion on the mounting surface of the valve of the operating device or the mounting surface of the valve for operating the operating device to reduce the contact area between the mounting surfaces, the flow of heat from the operating device to the valve is reduced, The effect of preventing dew condensation increases.

(Embodiment) Next, an embodiment of a dew condensation preventing structure for a butterfly valve according to the present invention will be described with reference to the drawings.

FIGS. 1, 2, and 3 are a front view, a side view, and a plan view showing a butterfly valve to which an embodiment of the present invention is mounted, in which only a molded heat-insulating housing is sectioned.

1, 2 and 3, reference numeral 1 denotes a butterfly valve, 2 denotes an operating device, and 3 denotes a molded heat insulating casing formed of a heat insulating material such as styrene foam or glass wool. Reference numeral 4 denotes a molded heat-insulating cylinder that connects between the molded heat-insulating housing 3 and the heat-insulating coating applied to the butterfly valve 1 to prevent dew condensation at this portion.

Reference numeral 1a denotes a mounting flange on which the valve operating device 2 is mounted, and the molded heat-insulating housing 3 covers the flange 1a.

FIG. 4 is a perspective view showing the parts 3a and 3b of the molded heat-insulating housing 3 divided into two parts. The part 3b is obtained by turning the part 3a upside down, and the parts 3a and 3b have the same shape.

The two parts 3a and 3b are easy to work by sandwiching a double-sided adhesive tape between the joining surfaces 3c and 3d, and the work is easy, but an adhesive is applied to both or one of the joining surfaces 3c and 3d. May be adhered.

FIG. 5 is a perspective view showing another embodiment of the molded heat-insulated casing 3 divided into two parts, and the joining surface 3c of the portions 3a and 3b of the molded heat-insulated casing 3
And 3d have uneven surfaces that fit together. Examples of the shape of the uneven surface are shown in FIGS. 6A and 6B, and the shapes of the joining surfaces 3c and 3d shown in FIG. 5 are the shapes shown in FIG.

Further, the portions 3a and 3b shown in FIG. 5 are the same as those shown in FIG. 4, and the portion 3b is obtained by inverting the portion 3a, and the portions 3a and 3b have the same shape. For this reason, the joint surface
In the shapes of 3c and 3d, the upper half and the lower half are formed in opposite shapes of the unevenness.

FIG. 7 is a partial front view showing only the valve in cross section when the concave portion 1c is provided on the mounting surface 1b on which the operating device of the valve 1 is mounted. However, the molded insulated housing has been removed. FIG. 8 is a plan view of the mounting surface 1b. In this embodiment, the concave portion 1c is provided on the valve 1 side, but may be provided on the mounting surface 2a of the operating device 2 on the valve 1.

In the embodiment shown in FIGS. 1 to 3, the outer surface of the molded heat insulating casing 3 is covered with the color iron plate 5, whereby external water or moisture is sucked into the molded heat insulating body 3. To prevent the insulation effect from lowering. The outer surface of the molded heat-insulating housing may be covered by another waterproof treatment such as applying a resin paint.

Also, in FIGS. 1 to 3, 1d is a rotation instruction plate,
1e is a fixed indicating plate, which indicates the open / closed state of the valve 1 by these. Therefore, the rotation indicating plate 1d and the fixed indicating plate 1e are
Both are provided outside the molded heat-insulating housing 3.

The shape of the molded heat-insulated housing 3 shown in FIGS. 4 and 5, the dividing method, the shape of the joining surface, and the like are all merely examples of the present invention, and are appropriately determined according to the shape of the operating device. It is to be selected. Further, holes for the opening degree indicating device, the opening degree adjusting device, the handle shaft, and the like may be formed by appropriately processing after forming the molded heat-insulating housing 3 as necessary.

 Next, the operation of the above embodiment will be described.

First, since the operating device 2 and the mounting flange 1a are almost completely covered with a molded heat insulating casing 3 formed of a heat insulating material such as styrene foam or glass wool, air is mounted on the operating device 2 with the mounting flange 1a. There is no direct contact with the outer surface of the body of the flange 1a, so that the operating device 2
Does not condense even if the fluid is deprived of heat by the fluid via the valve 1 to a low temperature.

For this reason, the operating device 2 and other equipment do not rust due to the dew water, and the heat insulating covering material of the valve 1 and the piping does not suck the dew water to lower the heat insulating effect.

Furthermore, dew condensation water, especially water stained with rust, does not flow to the floor or the like, and does not deteriorate the floor surface or other environments.

In this case, as shown in FIGS. 4 and 5, the molded heat-insulating casing 3 is divided into two or more parts 3a and 3b, and the main body of the operating device 2 is wrapped and joined. It is easy and has a good dew condensation preventing effect.

The work can be further facilitated by joining the molded heat insulating casing 3 by sandwiching the double-sided adhesive tape between the joining surfaces 3c and 3d.

Furthermore, the joining surfaces 3c and 3d of the parts 3a and 3b of the molded heat insulating housing
When they are fitted to each other with the concave and convex surfaces as shown in FIG. 6 to be joined to each other, the relative positions of the portions 3a and 3b can be correctly joined, and the joining is further strengthened.

4 and 5, one of the pair of parts 3a and 3b having the same shape is turned upside down from the state of 3a and joined to the other 3a. By doing so, the number of types of molds for molding the portions 3a and 3b of the molded insulated housing 3 and the types of the portions 3a and 3b of the molded insulated housing are reduced, which is more economical.

Further, a recess 1c, which is the latter in the example shown in FIG. 7, is provided on the mounting surface 2a of the operating device 2 on the valve 1 or the adhesive surface 1b of the valve on which the operating device 2 is mounted, and the mounting surface 1b When the contact area between 2a is reduced, the flow of heat from the operating device 2 to the valve 1 decreases, and the effect of preventing dew condensation increases.

(Effects of the Invention) As is clear from the above, according to the present invention, a number of very excellent effects as described below can be obtained.

In a valve operating device mounted on a pipe through which a cold fluid flows, it is possible to reliably prevent dew condensation on an operating device mounted on this flange between a valve stem protruding from a butterfly valve and a mounting flange of the valve stem. .

Therefore, the operating device and other equipment do not rust.

Condensed water does not seep into the heat insulating material of valves and pipes, and does not reduce its heat insulating effect.

 The environment is not polluted by the condensation water.

 Insulation coating of the operation device can be easily performed.

It is easy and economical to manufacture a molded insulated housing that covers the operating device.

By dividing the molded heat-insulating housing, molding and connection are facilitated, and the connection can be strengthened.

Heat transfer on the mounting surface of the valve and the operating device can be reduced, and the effect of preventing dew condensation can be further increased.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view showing one embodiment of the present invention, FIG. 2 is a partially cutaway side sectional view of the same, and FIG. 4 and 5 are perspective views showing each embodiment of the molded heat-insulated housing divided into two parts. FIG. 6 is a partial cross-sectional view showing an example of an uneven joining surface of the divided molded heat-insulated housing. FIG. 7 is a partial front view of an assembly of the operating device and the valve, showing only the valve in section, and FIG. 8 is a plan view of the mounting surface of the valve shown in FIG. DESCRIPTION OF SYMBOLS 1 ... Butterfly valve 1a ... Mounting flange 1b ... Mounting surface, 1c ... Recess 2 ... Operating device, 2a ... Mounting surface 3 ... Molded heat insulating casing (heat insulating material) 3a, 3b ... Molded heat insulating casing Body parts 3c, 3d ... Joint surface 4 ... Molded heat insulating cylinder

Claims (6)

(57) [Claims] An operating device for opening and closing a valve is mounted on a mounting flange of a butterfly valve, and almost all outer surfaces including a lower surface of the operating device and the mounting flange are formed of a heat insulating material such as styrene foam or glass wool. A dew-prevention structure for a butterfly valve, which is covered with a heat-insulating housing and surrounds an operation device and a lower surface of a mounting flange. 2. The dew condensation preventing structure for a butterfly valve according to claim 1, wherein the molded heat-insulating housing is divided into two or more and joined. 3. The structure for preventing dew condensation of a butterfly valve according to claim 1, wherein a double-sided adhesive tape is sandwiched between the joining surfaces of the portions of the molded heat-insulating housing. 4. The structure for preventing dew condensation of a butterfly valve according to claim 1, wherein the joint surfaces of the portions of the molded heat-insulating housing are concave and convex surfaces which are fitted to each other. 5. The butterfly valve according to claim 1, wherein all or a part of the molded heat insulating casing is formed by inverting one of the pair of molded heat insulating casings having the same shape and joining it to the other. Anti-condensing structure. 6. An operation device for opening and closing a valve is mounted on a mounting flange of a butterfly valve, and almost all outer surfaces including the lower surface of the operation device and the mounting flange are formed of a heat insulating material such as styrene foam or glass wool. Covering the operation device and the lower surface of the mounting flange by covering with a heat insulating casing, and surrounding the portion connecting the molded heat insulating casing and the heat insulating coating applied to the butterfly valve with a molded heat insulating cylinder, this connection. The dew condensation prevention structure of the butterfly valve, which prevents dew condensation on the part.