JPS60129498A - Drain trap - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Technical Field The present invention is directed to the treatment of condensate (condensed water,
This relates to the valve mechanism of the drain trap that discharges separated water.

Technical background If a large valve hole can be opened and closed with a small operating force, the operation mechanism such as a float or bimetal, and the traps and
The cost of casing can be reduced.

Therefore, various efforts have been made in the past. One of them is a pilot valve system, but this has drawbacks such as a complicated structure and the possibility of dust getting trapped in the pores and sliding parts. Another method is to apply fluid pressure symmetrically to the valve body so that they cancel each other out so that the valve body is not affected by the fluid pressure □, and the present invention also belongs to this fluid pressure canceling method. The two-seated valve system is common, but it is difficult to determine one method for manufacturing so that the two valve faces are in contact with the two valve seats at the same time, and the fluid pressure is high in the unseated position. This has the disadvantage that it does not act symmetrically on the valve body and the required operating force increases.

Prior art and its problems Therefore, a basket-shaped valve body with a special shape has been proposed. An example thereof is shown in Japanese Unexamined Patent Publication No. 114093/1983. This will be explained with reference to FIG. A valve body 52 is fixed to the bottom wall 51 of the valve chamber connected to a high pressure air or steam system. The valve box 52 has a cylindrical shape, one end opens into the valve chamber, the other end is closed by a back wall, and a discharge hole 5 is provided around the periphery.
3 is open. The discharge hole 53 is connected to the low pressure area.

A valve seat plate 54 is placed on the back wall of the valve box 52, and the valve body 5
5 are arranged so as to be freely displaceable. The valve body 55 is flow 1~
It is connected to a lever 56 so as to be operated by a lever 57.

The valve body 55 has a cylindrical shape, the central hole is connected to the valve chamber, and the annular valve surface at one end faces the medium-heat hole so as to close the medium-heat hole when it comes into contact with the flat valve seat surface of the valve seat plate 54. There is. The valve body 55 has a structure in which airtightness is maintained between the external wall of the valve body 55 and the internal wall of the valve box 52 with a gong 58.

In this case, the annular valve surface at one end of the valve body 55 is pressed against the valve seat surface to close the valve hole, and in consideration of the fact that the valve body 55 is tilted, a protrusion is provided on the valve seat plate 54 at the center of the back surface. It is set up so that it can swing in all directions. This structure is based on the valve seat plate 54.
This prevents unnecessary rocking due to the discharged fluid and makes it easy for the valve seat plate 54 to get caught on the inner wall of the valve box 52. In addition, the valve body 5
The backing 58 is easily damaged due to the inclination of the backing 58. These inconveniences can be solved by using a structure that guides the valve body so that it does not tilt. For this purpose, it is necessary to reduce the frictional resistance between the valve body and the wall that guides it.

Technical Problem The technical problem of the present invention is to guide the valve body so that it does not tilt;
Moreover, the purpose is to reduce the frictional resistance associated with this.

Technical Means The technical means of the present invention taken to solve the above-mentioned technical problems are as follows: (a) The outer peripheral wall of the valve body is made into a cylindrical surface, and (b) A wall that guides the inserted valve body so as to be freely displaceable. is made into a cylindrical surface whose inner diameter is slightly larger than the outer diameter of the valve body, and (c) a valve hole is formed around the entire circumference of a predetermined width at a predetermined position in the axial direction of the guide wall, and both sides of the valve hole are made into a cylindrical surface with an inner diameter slightly larger than the outer diameter of the valve body. Non-porous valve seat surface.

(d) Make a hole in the valve body in the axial direction so that both ends of the valve body communicate with each other, (e) Apply IVI lubricating material with low frictional resistance to one or both of the outer circumferential wall and guide wall of the valve body. It is coated.

・Effect of technical means The operation of the above technical means is as follows.

The outer peripheral wall of the valve body lightly touches the guide wall, and both ends of the valve body communicate with the valve body through GEI holes or the like. Therefore, the same amount of fluid pressure acts on both ends of the valve body,
canceled out. Since the valve hole is opened at a predetermined width at a predetermined position in the axial direction of the guide wall all around the circumference, the fluid pressure also acts symmetrically in the circumferential direction and cancels out. Therefore, the valve body is
If a force greater than the frictional resistance between the valve body and the guide wall is applied, the valve body is displaced in the axial direction, and the valve hole is closed or opened depending on the position of the valve body. At this time, since one or both of the outer circumferential wall and the guide wall of the valve body is coated with a lubricating material with low frictional resistance, the frictional resistance is low. Further, the outer circumferential wall of the valve body and the valve seat surface of the guide wall are in contact with each other via a lubricating material, and are sealed by the contact force and the water sealing action of the drain.

If a synthetic resin known as a registered trademark of Teflon is used as a lubricating material, the desired sealing effect can be obtained with a much smaller contact angle than metal-to-metal contact, and at the same time, the frictional resistance is reduced.

Unique effects The present invention produces the following unique effects.

In the conventional type shown in Fig. 2, the size of the contact circle between the valve body and the valve seat surface is different from the contact circle between the valve body and the backing, so that the axial fluid pressure acting on the valve body can be sufficiently offset. I can't. In the present invention, since the valve body and the guide wall are always in contact with each other on the same cylindrical surface, the axial fluid pressure acting on the valve body can be sufficiently offset. Moreover, since both the valve body and the guide wall have a simple cylindrical shape, they can be made accurately without using particularly advanced technology.

In the present invention, since the valve body and the guide wall are in wide contact with each other on the cylindrical surface, there is almost no inclination of the valve body, and the backing action of the lubricating material is durable.

DESCRIPTION OF EMBODIMENTS An example (see Fig. 1) without showing specific examples of the above-mentioned technical means.
Explain.

A gasket 5 is sandwiched between the main body 2 and a lid 1 is attached with bolts 6 to form a casing. Inside the casing, cylindrical valve chambers 15 are formed at the top and bottom.

A cylindrical guide wall member 7 is arranged along the inner wall of the valve chamber 15. The guide wall member 7 is fixed with its both ends touching the bottom wall of the main body 2 and the ceiling of the lid 1. The guide wall member 7 has a central portion and a lower end portion that are imperforate, and its inner surface forms a valve seat surface 13,14;
An O-ring 10.11 is interposed between the outer surface and the main body. There are pores in the area between the upper part of the guide wall member 7 and the valve seat surface 13,14. Further, the inner surface of the guide portion 7 is coated with a synthetic resin known as a registered trademark of Teflon.

An inlet 3 connected to a steam system or an air system communicates with the outer periphery of the pore in the upper part of the guide wall member 7. An annular groove 12 with a constant width is formed on the outer periphery of the pore between the valve seat surfaces 13 and 14, and the groove 1
2 communicates with an outlet [14] which is connected to a lower pressure area than the inlet side.

The outer circumference of the valve body 8 is a cylindrical surface, and its outer shape is similar to that of the guide wall member 7.
The inner diameter of the guide wall member 7 is slightly smaller than that of the inner diameter of the guide wall member 7, and the guide wall member 7 is inserted in a state in which it is in slight contact with the guide wall member 7. A hole 9 is formed in the center of the valve body 8, and the upper and lower spaces communicate with each other through the hole 9. Further, the valve body 8 is formed with a concave space 20 that opens downward, and is also a float that receives buoyancy from the gas accumulated there. Of course,
The valve body may be made of a material with a small ratio and may be a float.

The valve body 8 acts as a float and floats up due to buoyancy when water accumulates in the valve chamber 15. When the lower end of the valve body 8 reaches above the valve seat surface 14, the water in the valve chamber 15 passes through the pores of the guide wall member, passes through the annular groove 12, and is discharged to the outlet 4. As the water discharge progresses and the water level in the valve chamber 15 decreases, the valve body 8 descends and water drainage stops.

The pores formed in the upper part of the guide wall member act as a screen and may have a different size from the pores between the valve seat surfaces 13, 14.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of the prior art. 7: Guide wall member 8: Valve body 12: Annular groove 13.14:
Valve seat surface 15: Valve chamber

Claims (3)

[Claims] (1) The outer circumferential wall of the valve body is made into a cylindrical surface, and the wall that guides the displaceably inserted valve body is made into a cylindrical surface whose inner diameter is slightly larger than the outer diameter of the valve body. A valve hole is drilled around the entire circumference of a predetermined width at the position of [2], and both sides of the valve hole are made of a non-porous valve seat surface of a predetermined width, and a hole is made in the valve body in the axial direction.
A drain trap that communicates with both ends of the valve body and coats one or both of the outer circumferential wall and guide wall of the valve body with a lubricating material with low frictional resistance. (2) The drain wrap according to claim 1, in which the valve body has a flow of 1 to 1. (3) The drain trap according to claim 1, wherein the guide wall is formed into a cylindrical member and the member is attached to the casing.