JP2002372190A - Floating type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floating type steam trap capable of reducing the re- evaporation of condensate flowing through a valve port. SOLUTION: A front line of the free floating type steam trap 1 and a rear line of the free floating type steam trap 2 are arranged in series to each other, and an outlet 11 of the front line free floating type steam trap 1 is communicated with an outlet 10 of the rear line free floating type steam trap 2. Each free floating type steam trap 1 and 2 is formed with each inlet 9 and 20, each valve chamber 7 and 8 and each outlet 11 and 12 in a valve casing respectively formed of each main body 3 and 4 and each cover member 5 and 6. Valve ports 19 and 20 for communicating the valve chambers 7 and 8 with the outlets 11 and 12 are formed in a lower part of the valve chambers 7 and 8, and the valve ports 19 and 20 are opened and closed by floats 23 and 24 housed in the valve chambers 7 and 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam piping system which utilizes the difference in specific gravity between gas and liquid to open or close a valve port either directly by a float contained in a valve chamber or by driving a valve member. The present invention relates to a float type steam trap for automatically discharging generated condensate.

[0002]

2. Description of the Related Art The basic structure of a float type steam trap is as follows. An inlet, a valve chamber, and an outlet are formed by a valve casing, and a valve port communicating the valve chamber and the outlet is formed in a lower portion of the valve chamber, and is housed in the valve chamber. The valve port is opened and closed directly by a float or by driving a valve member.

[0003]

In the above-mentioned conventional float type steam trap, the discharged condensate flows down the valve port at high speed because it re-evaporates at the valve port. However, there is a problem that the metal ions dissolved in the metal pierce the inner wall of the valve opening and gradually accumulate.

Accordingly, an object of the present invention is to provide a float type steam trap which can reduce re-evaporation of condensate flowing down a valve port.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is that a valve casing is formed with an inlet, a valve chamber, and an outlet, and the valve communicates the valve chamber with the outlet. The port is formed in the lower part of the valve chamber, and in a float type steam trap that opens or closes the valve port by directly or by driving a valve member with a float accommodated in the valve chamber, a plurality of the float type steam traps are arranged in series, The float type steam trap is characterized in that the outlet of the float type steam trap in the front row is connected to the inlet of the float type steam trap in the rear row.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, a plurality of float steam traps are arranged in series, and the outlet of the float steam trap in the front row is connected to the inlet of the float steam trap in the rear row. The valve opening of the float type steam trap is substantially the same pressure as the internal pressure of the float steam trap in the rear row, and does not cause a sudden pressure drop. Therefore, the re-evaporation of the condensed water flowing down the valve opening of the float steam trap in the front row can be reduced. In addition, condensate whose temperature has decreased due to heat radiation from the rear row float steam trap flows down to the valve port of the rear row float steam trap. Therefore, the re-evaporation of the condensed water flowing down the valve opening of the float steam trap in the rear row can be reduced.

[0007]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). This embodiment is applied to a free-float type steam trap, and a free-float type steam trap 1 in a front row and a free-float type steam trap 2 in a rear row are arranged in series. In each of the free float steam traps 1 and 2, lid members 5 and 6 are fastened to the main bodies 3 and 4 with bolts (not shown) to form valve casings, and valve chambers 7 and 8 are formed therein. Body 3, 4
In the upper part, inlets 9 and 10 and outlets 11 and 12 are coaxially opened at the upper part. The inlet flanges 13 and 14 are welded to the inlets 9 and 10, the outlet flanges 13 and 14 are welded to the outlets 11 and 12, and the welds 15 and 16 are welded. Inlets 9 and 10 communicate with valve chambers 7 and 8, and outlets 11 and 12 rise from valve ports 19 and 20 opened in valve seat members 17 and 18 and communicate with valve chambers 7 and 8 via passages 21 and 22. I do. The outlet 11 of the free float steam trap 1 in the front row communicates with the inlet 10 of the free float steam trap 2 in the rear row.

[0008] Valve seat members 17, 18 having valve ports 19, 20 opened are attached to the lower side walls of the main bodies 3, 4 by screw connection. Hollow spherical floats 23 and 24 for opening and closing the valve ports 19 and 20 are accommodated in the valve chambers 7 and 8 in a free state.
Float seats 25 and 26 for defining the lowering positions of the floats 23 and 24 are formed at the bottom of the.

Next, the operation of the free-float type steam trap of this embodiment will be described. Condensate and steam flow into the valve chamber 7 from the inlet 9 of the free-float steam trap 1 in the front row, and the condensate separates at the bottom and the steam separates at the top and accumulates. Since the buoyancy increases when the liquid level rises, the float 23 rises to open the valve port 19, and the condensate in the valve chamber 7 rises from the valve port 19 and is discharged to the outlet 11 through the passage 21. When the liquid level in the valve chamber 7 drops due to the discharge of the condensate, the float 23 descends and the valve port 19 is closed. The condensate discharged to the outlet 11 flows into the valve chamber 8 from the inlet 10 of the free-float type steam trap 2 in the rear row, and the condensate is separated into a lower portion and the steam is separated and accumulated in an upper portion. Since the buoyancy increases when the liquid level rises, the float 24 rises to open the valve port 20, and the condensate in the valve chamber 8 rises from the valve port 20 and is discharged to the outlet 12 through the passage 22. When the liquid level in the valve chamber 8 drops due to the discharge of the condensate, the float 24 descends and the valve port 20 is closed.

The opening 19 of the front free-float steam trap 1 is substantially the same as the internal pressure of the rear free-float steam trap 2 and does not cause a sharp pressure drop. Re-evaporation of the condensed water flowing down the valve port 19 can be reduced. Also, the condensate whose temperature has dropped due to heat radiation from the rear row free-float type steam trap 2 flows through the valve port 20 of the rear row free-float type steam trap 2. Re-evaporation of condensate flowing down can be reduced.

In the above embodiment, a free-float type steam trap has been exemplified. However, the present invention can be applied to a lever-float type steam trap. Also,
Although two devices are illustrated, three or more devices may be provided.

[0012]

The present invention has the following specific effects. As described above, according to the present invention, a plurality of float steam traps are arranged in series, and the outlet of the front row float steam trap is connected to the inlet of the float steam trap of the rear row, thereby flowing down the valve port. Reevaporation of condensate can be reduced. Therefore, an excellent effect of preventing erosion and deposition of metal ions on the inner wall of the valve opening is produced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a free-float type steam trap according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front row free float type steam trap 2 Back row free float type steam trap 3,4 Main body 5,6 Lid member 7,8 Valve room 9,10 Inlet 11,12 Outlet 17,18 Valve seat member 19,20 Valve port 21 , 22 rising passage 23,24 float

Claims (1)

[Claims] An inlet, a valve chamber, and an outlet are formed in a valve casing, a valve port communicating the valve chamber and the outlet is formed in a lower portion of the valve chamber, and the valve member is driven directly or by a float housed in the valve chamber. In the float type steam trap that opens and closes a valve port, a plurality of the float type steam traps are arranged in series, and the outlet of the front row float type steam trap is connected to the inlet of the rear row float type steam trap. Float type steam trap.