JPH0468518B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a steam trap that automatically discharges condensate from steam-using equipment, steam piping, etc., and particularly relates to the structure of the valve port.

BACKGROUND ART Conventionally, there is a free-float type steam trap as shown in FIG. 2, for example. This is a trap housing in which a lid 2 is attached to a main body 1 with bolts 3. 4 is a gasket that maintains the airtightness of the joint between the main body 1 and the lid 2.

An inlet passage 5, which is piped to steam-using equipment (not shown), communicates through a cylindrical screen 6 to the upper part of a condensate sump chamber 7 within the housing. 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.

Reference numeral 9 denotes a valve seat member 12 that protrudes into the reservoir chamber 7 and forms a valve port 10 that is opened and closed by contact with the surface of the float 8. The valve seat member 9 is airtightly inserted into the lower part of the main body 1 via an O-ring 11. 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. Reference numeral 15 denotes a through hole through which the fluid flowing from the valve port 10 communicates with the discharge passage 17 through the rising passage 16.

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 drains the condensate into the discharge passage 17. lead

The valve seat is composed of a small diameter valve port and a large diameter valve chamber, as shown in FIG. 4a. 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 closing force of the float becomes too large, and therefore a large-diameter float with high buoyancy must be used, which increases the size of the trap as a whole. 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. 4a, 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. For this reason, foreign matter E such as dirt and carbon in the condensate begins to collect and adhere to part C and accumulate (No. 4
Figure b).

This accumulated foreign matter E further grows into a deposit F as shown in FIG. 4c, 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 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-mentioned problems is a steam generator comprising 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. In the valve seat member of the trap, a rotating member having an impeller is disposed within 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 opening structure for a steam trap characterized in that a member rotates within the valve opening or within the valve chamber.

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

Operation The impeller and the rotating member integrally formed therewith also rotate due to the high-speed fluid flowing into the valve chamber from the valve port. When the rotating member rotates, the scraping member 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 inner surface of the valve chamber.

Effects of the Invention According to the technical means of the present invention, foreign matter such as dust is not accumulated in the valve opening, and the steam trap can continue to operate satisfactorily.

In addition, 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.

Examples Examples showing specific examples 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 has a small diameter valve port 31 and a large diameter valve chamber 3.
Formed from 2. A valve seat surface 33 is formed on the upstream side of the valve port 31, and a float 34 comes into contact with the valve seat surface 33. Benguchi 3
1 and the valve seat surface 33 is provided with an R surface 35 to reduce flow path resistance. The secondary side of the valve chamber 32 is opened with a through hole 36 directed toward the outlet side of the trap.
A pivot shaft 38 with a scraping member 37 attached to its tip is inserted into a fixing plate 39 and fixed with an E-ring. 41 is a locking member. An impeller 42 is located at the center of the rotating shaft 38.
Attach. As shown in the figure, the impeller 42 has a shape like an airplane propeller, and is formed of three pieces in total, although they are not shown in the figure.

The scraping member 37 is composed of three blades 43, 44, and 45, as shown in FIG. 2, and is arranged with a slight gap between the outer periphery and the inner neck wall of the valve port. .

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. 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 impeller 42 rotates at high speed due to the high-speed fluid at this time, and at the same time, the scraping member 3
7 also rotates. Then, three shaving blades 43,4
4 and 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 any 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 in some cases, 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 of Fig. 1, Fig. 3 is a sectional view of the float type steam trap, Fig. 4 a, b,
c is a sectional view of a conventional valve seat member. 1: Main body, 2: Lid, 5: Inlet passage, 8: Float, 9, 30: Valve seat member, 10, 31: Valve port, 2
0, 32: Valve chamber, 37: Scraping member, 38: Swivel 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 disposed within the valve chamber, and A valve opening structure for a steam trap characterized in that a scraping member is formed at the tip of the 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. .