JPH0468516B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a steam trap for automatically discharging condensate generated in a steam piping system. There are various types of steam traps, but most have an inlet and an outlet coaxially arranged to facilitate piping.

Prior Art A conventional steam trap will be explained with reference to Japanese Utility Model Publication No. 55-33108.

This is a free-float type steam trap using a spherical hollow float.

The casing forms the inlet, outlet, and valve chamber. The casing is cast because the material is inexpensive and it is easy to make complex shapes. The inlet and outlet are coaxially formed in the upper part of the casing. A valve seat member having a valve hole communicating between the inlet and the outlet is attached to the lower part of the casing. The valve hole and the outlet are not formed on the same axis, but communicate through a rising passage. A float that sits on and off the valve seat member to open and close the valve hole is accommodated in a free state.

Problems to be Solved by the Invention The condensate that has passed through the valve hole is diverted toward the rising passage. It is then discharged from the exit. Since the condensate passing through the valve hole is at a high temperature, high pressure, and high velocity, it violently collides with the inner wall of the rising passage, severely corroding this area and penetrating the casing.

Therefore, the technical problem of the present invention is to prevent the inner wall of the casing from being corroded by condensate flowing out from the valve hole.

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is that the valve hole and the outlet are not coaxially formed, and the condensate flow from the valve hole collides with each other. In a device with a cast passage wall, a cylindrical container made of an corrosion-resistant material is placed between the valve hole and the passage wall, and an inlet hole is opened in the tangential direction of the container to connect the valve hole and the inside of the container. An outflow hole is formed in the center of the lower part of the container to allow the inside of the container to communicate with the passage wall side.

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

The condensate that has passed through the valve hole flows into the container from the inflow hole. Since the inlet holes open tangentially to the container, the condensate is forced to swirl along the side wall of the container. The velocity of the swirl flow is slower toward the center of the container, and the condensate in the center flows out from the outlet hole formed in the center of the lower part of the container, and then flows to the outlet while colliding with the channel wall of the casting and is discharged. Therefore, condensate with a reduced flow velocity passes through the casting passage wall while colliding with it.
This part will not be eroded. Furthermore, since the container is made of corrosion-resistant material, the container will not be eroded.

Effect of the invention The present invention produces the following unique effects.

It is expensive to make the entire casing from corrosion-resistant material, and it is difficult to fabricate complex shapes. In the present invention, since only the container is made of an corrosion-resistant material, the cost is low, and since it is only formed into a cylindrical shape, it is easy to manufacture.

Embodiment An embodiment illustrating a specific example of the above technical means will be described (see FIGS. 1 to 3).

A valve casing is formed by fastening a lid 2 to a main body 1 with bolts 3, and a valve chamber 4 is formed inside. Valve casing is cast. An inlet 5 is opened at the upper part of the valve chamber 4. The inlet 5 communicates with the valve chamber 4 via a cylindrical screen 6. An outlet 7 is formed coaxially with the inlet 5.

A valve seat member 8 is attached to the lower part of the main body 1. The valve seat member 8 is interposed on the outer periphery to maintain airtightness with the main body 1 with an O-ring 9, and is held by a plug 11 screwed to the main body 1 via a blind plug 10. The valve seat member 8 has a valve port 12 that opens at the inner end of the valve chamber 4 and a valve hole 13 that extends in the axial direction.
A through hole 15 positioned in the direction of the rising passage 14 is formed. The valve seat member 8, blind plug 10, and plug 11 are made of stainless steel.

A hole is made in the main body 1 and the valve seat member 8 in a direction perpendicular to the valve hole 13, and a cylindrical container 16 made of stainless steel is fitted therein. The lower end of the container 16 is open and sealed with a stainless steel plug 17 screwed onto the body 1. The outer diameter of the container 16 is formed to be slightly larger than the diameter of the valve hole 13 of the valve seat member 8. An inflow hole 18 is opened in the tangential direction of the container 16,
The valve hole 13 and the inside of the container 16 are made to communicate with each other. Plug 1
An outflow hole 19 is formed in the container 7 and the container 16. Outflow hole 1
One end of the valve hole 9 opens at the center of the lower part of the container 16, and the other end opens at the outlet 7 side of the valve hole 13.

A spherical hollow float 20 is accommodated in the valve chamber 4 in a free state. In addition, reference number 21 is a float seat, 2
2 is a plug, and 23 to 26 are gaskets.

The float 20 ascends and descends according to the level of condensate accumulated in the valve chamber 4, takes off and sits on the valve seat member 8, and closes the valve port 1.
Open and close 2. When the valve port 12 opens, the condensate that has passed through the valve hole 13 flows into the container 16 through the inlet hole 18. Since the inlet hole 18 opens tangentially to the container 16, the condensate is forced to swirl along the side wall of the container 16. The center of the container 16 is the condensate outlet hole 1.
9 and then flows to the outlet 7 while colliding with the channel wall of the casting and is discharged.

In the above embodiment, all of the condensate that passes through the valve hole flows into the container, but most of the condensate is allowed to flow into the container, and some condensate flows out to the outlet without passing through the container. You can also do this.

In addition, although the above embodiment has been described as an example applied to a free float type steam trap, the present invention is not limited to the above embodiment, and the valve hole and the outlet are not formed coaxially. Other types of steam traps may be used as long as they have cast passage walls against which the condensate flow from the valve hole impinges.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a steam trap according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the - line in FIG. 1, and FIG.
The figure is a sectional view taken along the line -- in FIG. 1: Main body, 2: Lid, 4: Valve chamber, 5: Inlet, 7:
Outlet, 8: Valve seat member, 13: Valve hole, 16: Container,
18: Inflow hole, 19: Outflow hole, 20: Float.

Claims (1)

[Claims] 1 The valve hole and outlet are not coaxially formed,
In a device with a cast passage wall that collides with the condensate flow from the valve hole, a cylindrical container made of an corrosion-resistant material is placed between the valve hole and the passage wall, and the inflow hole is tangentially connected to the container. A steam trap that has an outflow hole formed in the center of the lower part of the container to allow communication between the valve hole and the inside of the container, and to connect the inside of the container to the passage wall side.