JP2005121087A - Steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam trap capable of preventing erosion of an outlet passage. <P>SOLUTION: In the steam trap in which a valve hole 9 and an outlet 6 are not formed at the same axis and a casting outlet passage 4, where a condensation water flow from the valve hole 9 is collided, is prepared, the steam trap comprises a cylinder 14 at a position opposite to the valve hole 9 between the valve hole 9 and the outlet passage 4, a piston 15 displaceably arranged in the cylinder 14, a throttling hole 18 connecting a compression chamber 16 formed by the piston 15 and the cylinder 14 to a valve hole 9 side, and a shock absorber 13 having a coil spring 17 which urges the piston 15 to the valve hole 9 side. The outlet passage 4 is not eroded so that the condensation passing through the valve hole 9 is collided with the piston 15, the piston 15 is displaced to a compression chamber 16 side by resisting with elastic force of the coil spring 17, and impact force passes through the outlet passage 4 after damped by elastic force of the coil spring 17. <P>COPYRIGHT: (C)2005,JPO&NCIPI

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. The casing forms an inlet, an inlet chamber, an outlet passage, and an outlet. 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. It was.
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.

  The present invention is a 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 coaxial, and is opposed to the valve hole between the valve hole and the outlet passage. A cylinder, a piston displaceably disposed in the cylinder, a throttle hole that communicates a compression chamber formed by the piston and the cylinder to the valve hole side, and a coil spring that urges the piston to the valve hole side. It is characterized by arranging a shock absorber.

  Since the impact force of the condensate discharged from the valve hole to the outlet passage is buffered by the buffer 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.

  The steam trap according to the present invention has a cylinder, a piston disposed displaceably in the cylinder, and a compression chamber formed by the piston and the cylinder at a position facing the valve hole between the valve hole and the outlet passage. A shock absorber having a throttle hole communicating with the side and a coil spring that biases the piston toward the valve hole side is disposed. Therefore, the condensate that has passed through the valve hole collides with the piston and displaces the piston toward the compression chamber against the elastic force of the coil spring, so that the impact force is buffered by the elastic force of the coil spring and then passes through the outlet passage. To do. For this reason, the condensate buffered with impact force collides with the outlet passage, so that 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. The casing 1 having the inlet chamber 3 and the 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 into 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 outlet passage 4 above. . 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 shock absorber 13 screwed to the valve seat mounting port 12. The shock absorber 13 is located between the valve hole 9 and the outlet passage 4 so as to face the valve hole 9. The inlet 5 communicates with the upper part 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 lower part of the inlet chamber 3.

  The shock absorber 13 is cylindrical and has a cylinder 14 that is open at one end of the valve hole 9 and closed at the other end, a piston 15 that is displaceably disposed in the cylinder 14, and a compression formed by the piston 15 and the cylinder 14. The coil spring 17 is disposed in the chamber 16 and biases the piston 15 toward the valve hole 9, and the throttle hole 18 is opened in the piston 15 and communicates the compression chamber 16 with the valve hole 9. Members such as the piston 15 constituting the shock absorber 13 are made of stainless steel having erosion resistance. A spherical float 19 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 19 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 20 that holds the spherical float 19 at a position where the spherical float 19 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 19 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 from the valve hole 9 through the large-diameter hole 10 and collides with the piston 15, and the piston 15 is displaced toward the compression chamber against the elastic force of the coil spring 17. Then, it is discharged from the through hole 11 to the outlet 6 through the outlet passage 4. The outlet passage 4 is not eroded because the condensate whose impact force is buffered by the shock absorber 13 collides.

  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.

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 13 Shock absorber 14 Cylinder 15 Piston 16 Compression chamber 17 Coil spring 18 Restriction hole 19 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 cylinder is disposed at a position facing the valve hole between the valve hole and the outlet passage. And a shock absorber having a piston arranged to be displaceable in the cylinder, a throttle hole for communicating a compression chamber formed by the piston and the cylinder to the valve hole side, and a coil spring for biasing the piston to the valve hole side. A steam trap characterized by that.

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