JP4271546B2 - 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 and steam-using equipment. 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. Although most of them are classified into the thermostatic type, the inlet and the outlet are formed on the same axis for the convenience of piping. A conventional steam trap will be described with reference to Japanese Utility Model Publication No. 55-33108. This is a free float type steam trap using a spherical hollow float. An inlet, an inlet chamber, an outlet passage, and an outlet are formed by the casing. The casing is cast because it is inexpensive and easy to make complex shapes. The inlet and outlet are formed on the same axis in the upper part of the casing. A valve seat member having a valve hole communicating with the inlet chamber and the outlet passage is attached to the lower portion of the casing. The valve hole and the outlet are not formed on the same axis and communicate with each other via the outlet passage. A float that opens and closes the valve hole by being seated on the valve seat member is disposed in a free state in the inlet chamber.

The conventional steam trap has a problem that the outlet passage is eroded in a relatively short time because the condensate discharged from the valve hole to the outlet passage locally collides with a part of the peripheral wall of the outlet passage in a high-speed flow. There was a point.
Japanese Utility Model Publication No. 55-33108

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

  In the steam trap having a casting outlet passage where the condensate flow from the valve hole collides with the valve hole and the outlet being not coaxially formed, the condensate is swirled between the valve hole and the outlet passage. The swirl vanes that swing out on the circumference are arranged on the peripheral wall of the outlet passage.

  Since the impact force of the condensate discharged from the valve hole to the outlet passage is dispersed by the swirl vane between the valve hole and the outlet passage, the present invention has an excellent effect that the erosion of the outlet passage can be prevented. Arise.

  In the steam trap of the present invention, the condensate swirls between the valve hole and the outlet passage and is swung around the circumference of the outlet passage. Do not collide locally with any part. Therefore, since the condensate is dispersed and collides with the outlet passage, the outlet passage is not eroded.

  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. A casing member having an inlet chamber 3 and an outlet passage 4 is formed inside by fastening the lid member 2 to the cast body 1 with bolts. An inlet 5 and an outlet 6 are formed on the same axis at the top of the main body 1. A valve seat member 8 is attached to the lower part of the partition wall 7 of the main body 1 separating the inlet chamber 3 and the outlet passage 4. The valve seat member 8 is formed with a valve hole 9 that opens to the inlet chamber 3, a large-diameter hole 10 on the downstream side of the valve hole 9, and a through-hole 11 that opens from the large-diameter hole 10 to the upper outlet passage 4. . The valve hole 9 communicates with the large diameter hole 10 through the through hole 11. The valve seat member 8 is inserted through a valve seat mounting port 12 opened in the main body 1 and is held by a plug 13 that is screwed to the valve seat mounting port 12. The inlet 5 communicates with the upper portion of the inlet chamber 3, and the outlet 6 communicates with the valve hole 9, the large-diameter hole 10, and the outlet passage 4 rising from the through hole 11 at the lower portion of the inlet chamber 3.

  A disc 14 is fixed to the through hole 11 of the valve seat member 8 with a snap ring 15. On the circular plate 14, swirl vanes 16 are formed side by side so as to be inclined approximately 30 degrees obliquely upward on the circumference. The swirl vane 16 swirls the condensate from the valve hole 9 and swings it out to the peripheral wall of the outlet passage 4 on the circumference. The disc 14 forming the swirl vane 16 is made of stainless steel having erosion resistance. A spherical float 17 as a valve means made hollow with a stainless steel thin plate is accommodated in the inlet chamber 3 in a free state. The spherical float 17 opens and closes the valve hole 9 with its outer surface directly attached to and detached from the valve seat member 8. A float seat 18 that holds the spherical float 17 at a position where the spherical float 17 blocks the valve hole 9 is formed at the lower end of the inlet chamber 3.

  The operation of the free float steam trap is as follows. The inlet 5 is connected to a condensate generation site such as a steam using device. Condensate and steam flow into the inlet chamber 3, and condensate accumulates in the lower part and steam in the upper part. The spherical float 17 rises and falls according to the liquid level in the inlet chamber 3 and opens and closes the valve hole 9. When the valve hole 9 is opened, the condensate in the inlet chamber 3 passes through the through hole 11 from the valve hole 9 through the large diameter hole 10 and is swirled by the swirl vanes 16 when passing through the through hole 11, and the outlet After being swung around the circumference of the passage 4 on the circumference, it is discharged to the outlet 6. The outlet passage 4 is not eroded because the condensate is dispersed and collided by the swirl vanes 16.

  In the above embodiment, the free float type steam trap is exemplified. However, 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 part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid member 3 Inlet chamber 4 Outlet passage 5 Inlet 6 Outlet 8 Valve seat member 9 Valve hole 10 Large diameter hole 11 Through hole 14 Disc 16 Swirling blade 17 Spherical float

Claims (1)

In the case where the valve hole and the outlet are not formed coaxially and have a casting outlet passage where the condensate flow from the valve hole collides, the condensate is swirled between the valve hole and the outlet passage, so that the peripheral wall of the outlet passage A steam trap characterized by a swirling blade that swings out on the circumference.

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