JPH01158292A - Valve port structure of steam trap - Google Patents

Abstract

PURPOSE: To prevent foreign matter such as waste from piling up in a valve port by arranging communication holes communicating with the upstream and downstream sides of the valve point on an annular partition wall on the outer periphery of the valve port within the range of a seal diameter of the valve port. CONSTITUTION: A partition wall 31 forming a valve port 32 is arranged on a valve seat member 30. A plurality of communication holes 42 communicating with the upstream surface 39 and downstream surface 40 are arranged on the partition wall 31. In this way, the high pressure fluid at the upstream side of the valve port 32 flows into the drift portion of the downstream side of the valve port 32, therefore it is possible to prevent foreign matter such as waste from piling up in this portion.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a steam trap for automatically discharging condensate from steam-using equipment, steam piping, etc., and particularly to the structure of the valve opening.

BACKGROUND OF THE INVENTION Conventionally, there is a free float type steam trap as shown in FIG. 2, for example. In this case, a lid 2 is attached to a main body 1 with bolts 3 to form a trap housing. 4 is a gasket that maintains the airtightness of the joint between the main body 1 and the lid 2.

Inlet passage 5 connected to steam-using equipment (not shown)
communicates with the upper part of the condensate storage chamber 7 inside the housing through a cylindrical screen 6. A spherical float 8 is housed in a free state in the condensate reservoir chamber 7, and floats up and down based on the difference in specific gravity between the float and the condensate accumulated in the reservoir chamber 7.

9 is a valve seat member that projects into the reservoir chamber 7 to form a valve port 10 that is opened and closed by contact with the surface of the float 8; 12 is airtightly inserted into the lower part of the main body 1 via an O-ring 11; This valve seat holding member holds the valve seat member 9 with a shoulder portion 13, and is screwed onto the main body 1 from the outside via a gasket 14. Reference numeral 15 denotes a through hole through which the fluid flowing from the valve port 10 passes through the rising passage 16 and communicates with the discharge passage 17 .

Therefore, the condensate flowing in from the inlet passage 5 accumulates in the condensate reservoir chamber 7, and the float 8 ascends and descends according to the water level, opens and closes the valve port 10 of the valve seat member 9, and guides the condensate to the discharge passage 17. .

The valve seat structure is composed of a small diameter valve port and a large diameter valve chamber, as shown in FIG. 3(a). This is because if the diameter of the valve chamber is made the same as the diameter of the valve port, the resistance of the pipe becomes large and a large flow rate cannot be obtained.

On the other hand, if the valve diameter is increased, the valve closing force of the float becomes too large, which requires the use of a large diameter float with high buoyancy, which results in an increase in the size of the entire trap. Therefore, the structure of the valve seat member must include a small diameter valve port and a large diameter valve chamber.

Problems to be Solved by the Invention As shown in FIG. 3(a), high-speed fluid flows from part A of the small-diameter valve port 10 to part 8 of the large-diameter valve chamber 20 while expanding its flux. At this time, a gentle vortex is generated in the corner C of the valve chamber 20, and as a result, a snowdrift is formed in the C part. Therefore, foreign matter E such as dust and carbon in the condensate gathers in the 0 part and begins to adhere and accumulate (Fig. 3(b)).

This accumulated foreign matter E further grows into deposits F as shown in FIG. 3(C), and finally blocks the valve port 10, causing the problem that it no longer functions as a steam trap.

Therefore, a technical problem of the present invention is to provide a structure in which foreign matter such as dust does not accumulate inside the valve port of the trap.

Means for Solving the Problems The technical means of the present invention taken to solve the above problems is a steam trap consisting of a valve port and a valve chamber formed downstream of the valve port and having a diameter larger than the valve port diameter. In the valve seat member of
At the annular partition wall around the outer circumference of the valve port, within the seal diameter of the valve port,
This is a valve port structure for a steam trap characterized by providing a communication hole connecting the upstream side of the valve port and the downstream side of the valve port.

Function As explained above, the moment the high-speed fluid passes through the valve port and leaves the partition that forms the valve port, a pool is formed in the inner part of the partition on the valve chamber side, and foreign matter such as dust tends to accumulate. However, because the high-pressure fluid on the upstream side of the valve port flows into the cloud pool portion on the downstream side of the valve port through the communication hole provided in the annular partition wall, the low pressure area in that area is relaxed and a cloud pool occurs. It disappears. Therefore, foreign matter such as dust cannot adhere to it.

Furthermore, since the communication hole is provided within the range of the seal diameter of the valve port, when the valve port is blocked by the valve body and the valve is closed, no fluid flows through the communication hole. In other words, fluid passes through only when the valve port is open, so fluid is not discharged unnecessarily.

Effects of the Invention According to the technical means of the present invention, foreign matter such as dust will not accumulate in the valve port, and the steam trap will continue to operate satisfactorily.

can be done economically.

Example An example showing a specific example of the technical means of the present invention will be described.

(See FIG. 1) The valve seat member shown in FIG. 1 is built into the steam trap shown in FIG. 2, and a description of its operation as a steam trap will be omitted.

The valve seat member 30 includes an annular partition member 31 that forms a valve port 32.
It is divided into a valve port upstream side 33 and a valve port downstream side 34. The upstream side 33 of the valve port has a seal diameter X and the valve seat surface 3
6 is formed, and the float 35 comes into contact with it. Valve port downstream side 34
A valve chamber 37 is formed and a through hole 38 is provided toward the trap outlet side. A communication hole 42 connecting the upstream side surface 39 and the downstream side surface 40 of the partition wall portion 31 is opened. A plurality of communication holes 42 are provided in the annular wall 31 around the valve port 32 at equal intervals.

The action is as follows. The float 35 rises and falls according to the water level of the condensate to open and close the valve seat surface 36. Accordingly, condensate flows into the valve port, becomes a high-speed fluid, and flows into the valve chamber 37.
Go inside.

High-speed fluid flows into the valve chamber 37 while expanding its flux, and a gentle vortex is generated on the downstream side surface 40 of the partition wall, causing foreign matter such as dirt to adhere, but at the same time as the float opens. Since the fluid flows through the communication hole 42 to the downstream side surface 40 of the partition wall, that part is kept at a high pressure, and foreign matter is blown away by the flow of the fluid itself. Therefore, no foreign matter is permanently deposited on the downstream side surface 40 of the partition wall, so that condensate flows smoothly in the valve port 32 forever.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a valve seat member according to an embodiment of the present invention, the second image is a cross-sectional view of a float type steam trap, and Figure 3 (a) (
b) and (c) are cross-sectional views of conventional valve seat members. 1: Main body 2: Lid 5: Inlet passage 8: Float 9.30: Valve seat member 10.32: Valve port 20.37:
Valve chamber 42 two communication holes

Claims (1)

[Claims] 1. In the valve seat member of the steam trap, which consists of a valve port and a valve chamber formed on the downstream side of the valve port and having a diameter larger than the valve port diameter, the seal diameter of the valve port is A valve port structure for a steam trap characterized in that a communication hole connecting an upstream side of the valve port and a downstream side of the valve port is provided within the range.