JPH01158293A - Valve port structure of steam trap - Google Patents

Abstract

PURPOSE: To prevent foreign matter such as waste from piling up in the valve port and a valve chamber by connecting the valve port and the valve chamber with a gradually expanded pipe. CONSTITUTION: A valve port 31 with a small diameter and a valve chamber 32 with a large diameter are connected by a gradually expanded pipe 32. In this way, when fluid flows from the valve port 31 to the valve chamber 32, the fluid flows with the outer periphery of the flow flux along a surface of an expanded portion, therefore there occurs no drift and the pressure within the valve port 31 is uniform. Thus it is possible to prevent foreign matter such as waste from piling up in the valve port 31 and the valve chamber 32.

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 relates to the structure of the valve port.

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 reservoir 7 inside the housing through a cylindrical screen 6. A spherical float 8 is housed in a free state in a condensate reservoir 7, and floats up and down based on the difference in specific gravity between the condensate pool 7 and the condensate pool 7.

Reference numeral 9 designates a valve seat member that protrudes into the reservoir 7 to form a valve port 10 that opens and closes when the surface of the float 8 comes into contact with the valve seat member. 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 B 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, 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 that has a valve port and a valve chamber of different diameters, but does not allow foreign matter such as dust to accumulate inside the valve port.

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
This is a valve opening structure for a steam trap characterized in that the valve opening and the valve chamber are connected by a gently expanding pipe.

Effect As described above, high-speed fluid passes through the valve port, and the flux spreads and flows into the valve chamber, which has a larger diameter than the valve port.

However, since the valve port and the valve chamber are connected by a gently expanding tube, the outer circumference of the flux flows along the surface of the expanding portion. Therefore, the pressure inside the valve port becomes uniform without causing a pool due to the flow, and foreign matter such as dust flows out without adhering to the inside of the valve port or the inner surface of the valve chamber.

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.

In addition, since the small diameter valve port is connected to the large diameter valve chamber by a gently expanding pipe, fluid flows very smoothly without resistance, resulting in an increased flow rate compared to conventional valves.

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 is formed from a small diameter valve port 31 and a large diameter valve chamber 32. A valve seat surface 33 is formed on the upstream side of the valve port 31,
The float 34 comes into contact. The connecting portion between the valve port 31 and the valve seat surface 33 is provided with an R surface to reduce flow resistance. The secondary side of the valve chamber 32 is opened with a through hole 35 directed toward the outlet side of the trap. The small-diameter valve port 31 and the large-diameter valve chamber 32 are connected by a gently expanding pipe portion 36 as shown in the figure.

The action is as follows. The float 34 rises and falls according to the water level of the condensate to open and close the valve seat surface 33. Accordingly, condensate flows into the valve port, becomes a high-speed fluid, and flows into the valve chamber 32.
The flux enters the inside while becoming wider. However, since this flux spreads and flows along the surface of the pipe section 36, no pooling occurs, so the pressure distribution within the valve chamber 32 becomes uniform, and foreign matter such as dust does not adhere to the inner surface of the valve chamber. . Furthermore, foreign matter such as dust flows out due to the uniform flux flowing within the valve chamber.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a valve seat member according to an embodiment of the present invention, Fig. 2 is a sectional view of a float type steam trap, and Fig. 3 (a>(
b) (C) is a sectional view of a conventional valve seat member. 1: Main body 2: Lid 5: Inlet passage 8: Float

Claims (1)

[Claims] 1. In a steam trap valve seat member consisting 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 aperture, the valve port and the valve chamber are connected by a gently expanding pipe. A steam trap valve structure featuring: