JPH01158295A - Valve port structure of steam trap - Google Patents

Abstract

PURPOSE: To prevent foreign matter such as waste from piling up in the valve port by arranging a rotary member having impellers in the valve chamber and forming a chipping member at the distal end of the rotary member. CONSTITUTION: A rotary shaft 38 with a chipping member 37 mounted at the distal end thereof is mounted in a valve chamber 32. Impellers 42 are mounted in a central portion of the rotary shaft 38. In this way, the high speed fluid flowing from a valve port 31 to the valve chamber 32 rotates the rotary shaft 38 so that the chipping member 37 is also rotated in the valve port 31. Thus foreign matter such as waste is chipped in the valve port 31, therefore, it is possible to prevent foreign matter such as waste from piling up in the valve port 31.

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. 3, 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 chamber 7 inside the housing through a cylindrical screen 6. A spherical fluoride 8 is housed in a free state in the condensate chamber 7, and floats up and down based on the difference in specific gravity with the condensate accumulated in the condensate chamber 7.

Reference numeral 9 denotes a valve seat member that projects into the reservoir chamber 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. A 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. 15
is 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 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. .

As shown in FIG. 4(a), the valve seat is composed of a small-diameter valve port and a large-diameter valve chamber. 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. 4(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, 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. 4(b)).

This accumulated foreign matter E further grows into deposits F as shown in FIG. 4(C), and finally blocks the valve port 10, causing the problem that it no longer functions as a steam trap.

Therefore, the technical problem of the present invention is to create 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 consists 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 the steam trap, a rotating member having an impeller is arranged in the valve chamber, a scraping member is formed at the tip of the rotating member, and the scraping member is removed by the force of the impeller rotated by fluid. This is a valve port structure for a steam trap characterized in that a member rotates within the valve port or within the valve chamber.

The scraping member is, for example, a plate-shaped blade, and rotates within the valve opening with a small gap between the tip of the blade and the inner circumferential wall of the valve opening.

The impeller and the rotating member integrally formed therewith also rotate due to the high-speed fluid flowing into the valve chamber from the operating valve port.

When the rotary member rotates, the scraping member, which is attached at its tip and located within the valve opening, also rotates. This rotating scraping member scrapes off foreign matter such as dust that has adhered or is about to adhere to the inside of the valve opening. Therefore, foreign matter such as dust is flowed out without adhering to the inside of the valve port or the inside 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.

Further, since foreign matter such as dust inside the valve port is forcibly scraped off, the diameter of the valve chamber can be designed to be large, and the flow path resistance is correspondingly reduced, making it possible to increase the flow rate.

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

(See FIGS. 1 and 2) The valve seat member shown in FIG. 1 is built into the steam trap shown in FIG. 3, 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 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 eight surfaces 35 to reduce flow resistance. Valve chamber 3
The secondary side of the trap 2 is opened with a through hole 36 directed toward the outlet side of the trap.

A rotating shaft 38 with a scraping member 37 attached to the tip is fixed to the fixing plate 3.
9 and secure with E-ring. 41 is a locking member. An impeller 42 is attached to the center of the turning f (1138).The impeller 42 has a shape like an airplane propeller as shown in the figure, and is formed of three pieces in total, although it is not shown in the figure.

The scraping member 37 has three scraping blades 43 as shown in FIG.
．． 44.45, and is arranged with a slight gap between the outer circumference and the inner circumferential wall of the valve port.

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. In response, high-pressure, high-speed fluid flows into the valve chamber 32 from the valve port 31 and flows out into the through hole 36.

The high-speed fluid at this time causes the impeller 42 to rotate at high speed, and at the same time, the scraping member 37 is also rotated via the pivot shaft 38. Then, the three scraping blades 43, 44, 45 scrape off foreign matter such as dust that has adhered to or is about to adhere to the inside of the valve opening, and causes it to flow downstream. Therefore, the trap continues to operate well without foreign matter such as dust adhering to the inside of the valve port.

In this embodiment, the impeller 42 and the scraping member 37 are installed separately, but depending on the situation, the impeller 42 may be used as a scraping member.

[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 taken along line XX in Fig. 1, Fig. 3 is a sectional view of a float type steam trap, and Fig. 4(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, 31: Valve port 20. 32: Valve chamber 37: Scraping member 38: Pivot shaft 42: Impeller

Claims (1)

[Claims] 1. In a valve seat member of a steam trap 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 port diameter, a rotating member having an impeller is arranged in the valve chamber, and A valve opening structure for a steam trap, characterized in that a scraping member is formed at the tip of a rotating member, and the scraping member is rotated within the valve opening or within the valve chamber by the force of an impeller rotated by fluid.