JP4932215B2 - steam trap - Google Patents

Description

  The present invention relates to a steam trap that automatically discharges condensate generated in a steam piping system such as a steam transport pipe or a steam-using device, and more particularly to prevent erosion of an outlet passage due to a high-speed flow of discharged condensate. About. Condensate generation is unavoidable in the steam piping system, and it is necessary to discharge the generated condensate out of the system. A device that automatically discharges this condensate is a special valve called a steam trap.

  The steam trap uses a mechanical type that uses the difference in specific gravity of steam and condensate, a thermodynamic type that uses a difference in thermodynamic characteristics of steam and condensate, and a temperature difference between steam and condensate, depending on the driving principle of the valve member. The basic configuration is that a valve chamber with an inlet opening at the top and an outlet passage with an outlet opening at the top separated from the valve chamber is formed in the casing. A valve seat member having a valve hole opened at the chamber side end and a branch hole opened at the outlet passage side end is provided at the lower portion of the outlet passage so that the valve chamber communicates with the outlet passage, and the valve member that opens and closes the valve hole is disposed in the valve chamber. It is arranged.

In the conventional steam trap, the condensate discharged from the valve hole to the outlet passage side through the branch hole at the time of valve opening flows down at high speed while colliding with the inner wall of the outlet passage. There was a problem of being eroded by water.
Japanese Patent Laid-Open No. 10-2491

  The problem to be solved is to provide a steam trap that can prevent erosion of the outlet passage.

According to the present invention, a valve chamber having an inlet opening at the top and an outlet passage spaced from the valve chamber and having an outlet opening at the top is formed in the casing. A valve hole is opened at the valve chamber side end and the outlet passage side end. a valve seat member which branch hole is opened communicates the valve chamber and the outlet passage provided in the lower portion of the outlet passage, the valve member for opening and closing a valve hole that is arranged in the valve chamber, the branch hole is opened in the valve seat member Is formed from a plurality of small-diameter branch holes, a condensate reservoir is connected below the outlet passage, and a plurality of small-diameter branch holes are opened toward the condensate reservoir so that the discharged condensates collide with each other in the condensate reservoir. It is characterized by that.

  The present invention produces an excellent effect of preventing erosion of the outlet passage because the condensed condensate does not collide with the outlet passage in a high-speed flow by causing the discharged condensate to collide with each other in the condensate reservoir and decelerate. .

In the steam trap of the present invention, the branch hole opened in the valve seat member is formed from a plurality of small diameter branch holes, the condensate reservoir is connected below the outlet passage, and the discharged condensate collides with each other in the condensate reservoir. In this way, a plurality of small-diameter branch holes are opened toward the condensate reservoir. Therefore, the discharged condensate from the small-diameter branch hole collides with each other in the condensate reservoir and decelerates and then flows out to the outlet passage. For this reason, the outlet passage is not eroded because the discharged condensate with a reduced flow velocity collides.

  An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). This embodiment is applied to a free float type steam trap. The casing of the free float type steam trap is composed of a main body 1 and a lid member 2 which are formed by casting, and the lid member 2 is fastened to the main body 1 having an inlet 3, an outlet 4 and an outlet passage 5 to form a valve chamber 6 therein. . The inlet 3 and the outlet 4 open on the same axis in the upper part of the main body 1, the inlet 3 communicates with the upper part of the valve chamber 6, and the outlet 4 communicates with the upper part of the outlet passage 5. The valve chamber 6 and the outlet passage 5 are separated by a partition wall 7 formed integrally with the main body 1. A condensate reservoir 8 is connected below the outlet passage 5, and the bottom wall of the condensate reservoir 8 is formed by a plug 9.

  A valve seat member 12 having a valve hole 10 opened at the end of the valve chamber 6 and a plurality of small diameter branch holes 11 opened at the end of the condensate reservoir 8 is disposed through the partition wall 7 below the outlet passage 5. The small-diameter branch hole 11 of the valve seat member 12 opens toward the condensate reservoir 8 so that the discharged condensates collide with each other in the condensate reservoir 8. The valve seat member 12 is inserted from the valve seat mounting port 13 and is held by a plug 14 that closes the valve seat mounting port 13. The valve seat member 12 and the plugs 9 and 14 are formed of stainless steel having erosion resistance. A spherical float 15 as a valve means made hollow with a stainless steel thin plate is accommodated in the valve chamber 6 in a free state. The spherical float 15 opens and closes the valve hole 10 with its outer surface directly attached to and detached from the valve seat member 12. A float seat 16 that holds the spherical float 15 at a position where the spherical float 15 blocks the valve hole 10 is formed at the lower end of the valve chamber 6.

  The operation of the free float steam trap is as follows. Inlet 3 is connected to the location where condensate is generated such as equipment using steam. Condensate and steam flow into the valve chamber 6, and condensate accumulates in the lower part and steam in the upper part. The spherical float 15 rises and falls according to the liquid level in the valve chamber 6 and opens and closes the valve hole 10. When the valve hole 10 is opened, the condensate in the valve chamber 6 is discharged from the valve hole 10 to the outlet 4 through the small diameter branch hole 11, the condensate reservoir 8, and the outlet passage 5. The discharged condensate from the small-diameter branch hole 11 collides with each other in the condensate reservoir 8 and decelerates, and then flows out to the outlet passage 5. Therefore, the outlet passage 5 is not eroded by the condensate with a reduced flow velocity dispersed and colliding.

  In the above embodiment, the free float type steam trap is illustrated, but the present invention can be applied to a lever float type, a free bucket type, a lever bucket type, a disk type and other types of steam traps.

Sectional drawing of the free float type steam trap of this invention. The expanded sectional view of the valve seat member of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid member 3 Inlet 4 Outlet 5 Outlet passage 6 Valve chamber 8 Condensate reservoir 10 Valve hole 11 Small diameter branch hole 12 Valve seat member 15 Spherical float

Claims (1)

A valve chamber having an inlet opening at the top and an outlet passage separated from the valve chamber and having an outlet opening at the top is formed in the casing. A valve hole is opened at the valve chamber side end and a branch hole is opened at the outlet passage side end. The valve seat member is provided in the lower part of the outlet passage, the valve chamber communicates with the outlet passage, and the valve member that opens and closes the valve hole is disposed in the valve chamber . The branch hole opened in the valve seat member has a plurality of small diameters. It is formed from a branch hole, and a condensate reservoir is connected below the outlet passage, and a plurality of small-diameter branch holes are opened toward the condensate reservoir so that each discharge condensate collides with the condensate reservoir. And a steam trap.

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