JP2010065832A - Float type steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a float type steam trap quickly discharging a large quantity of air. <P>SOLUTION: A casing including a valve chamber 3 therein is formed by fastening a cover body 2 on a body 1 including an inlet 4 and an outlet 6. A valve seat 9 having a valve hole 7 and a normally open orifice 8 are joined to the cover body 2 of a valve chamber 3 lower sidewall. The valve hole 7 opens obliquely downward. A valve chamber side opening of the orifice 8 is opened at a section near a valve chamber side opening of the valve hole 7 and above the valve chamber side opening of the valve hole 7. Opening area of the orifice 8 is formed in a size with which all of condensation formed during normal operation during which steam is fed to a steam piping system is not discharged. A hollow spherical float 11 opening and closing the valve hole 7 is arranged in the valve chamber 3 in a free state. A bimetal 13 as a temperature response member is arranged in the valve chamber 3. The bimetal 13 deforms to narrow a U-shape and does not interferes with the float 11 at high temperature, and deforms to expand the U-shape and opens the valve hole 7 by lifting the float 11 at low temperature. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a steam trap that automatically discharges condensate generated in a steam piping system, and more particularly to a float steam trap that opens and closes a valve hole directly or through a valve member or the like with a closed float. It relates to the one that does not close the hole. Float steam traps automatically discharge only condensate without discharging steam using the difference in specific gravity between steam and condensate, but when non-condensed gas air flows into the valve chamber, As with steam, the valve hole is closed, causing air binding.

  Therefore, conventionally, a technique as disclosed in Japanese Utility Model Publication No. 48-8742 has been used. This is because the casing forms an inlet, a valve chamber, and an outlet. A valve hole that connects the valve chamber and the outlet is opened obliquely downward on the lower side wall of the valve chamber, and a float that opens and closes the valve hole is placed in the valve chamber. In addition, the temperature responsive member disposed in the valve chamber prevents the float from closing the valve hole at a low temperature so as not to interfere with the float at a high temperature.

The conventional float type steam trap is a temperature responsive member arranged in the valve chamber, which prevents the float from closing the valve hole at low temperatures, thereby discharging air from the valve hole to prevent air binding. Since only the air is discharged from the valve hole, there is a problem that it takes time especially when a large amount of air has to be discharged as in the initial startup of the piping system.
Japanese Utility Model Publication No. 48-8742

  Therefore, the technical problem of the present invention is to provide a float type steam trap capable of quickly discharging a large amount of air.

  The technical means of the present invention devised to solve the above technical problem is that a casing forms an inlet, a valve chamber, and an outlet, and a valve hole that communicates the valve chamber and the outlet is formed obliquely downward on the lower side wall of the valve chamber. A float that opens toward the valve and opens and closes the valve hole is disposed in the valve chamber, and the temperature responsive member disposed in the valve chamber prevents the float from closing the valve hole at low temperatures and does not interfere with the float at high temperatures. The valve chamber side opening is close to the valve chamber side opening of the valve hole and is opened higher than the valve chamber side opening of the valve hole, and the condensate generated during normal operation is discharged when steam is sent to the steam piping system. The present invention is characterized in that a normally-open orifice having an opening area that cannot be fully sized is provided.

  In the present invention, since the float is subjected to a force that draws the float toward the orifice due to the flow of air or condensate discharged from the normally open orifice, the float can easily open the valve hole and increase the opening area of the valve hole. This produces an excellent effect of increasing the discharge flow rate of air and condensate.

  The float type steam trap of the present invention is a temperature responsive member arranged in the valve chamber that prevents the float from closing the valve hole at low temperatures so that it does not interfere with the float at high temperatures. It has an opening area that is close to the chamber side opening and higher than the valve chamber side opening of the valve hole so that the condensate generated during normal operation when steam is fed to the steam piping system cannot be exhausted. A normally open orifice is provided. Therefore, since air can be discharged from the valve hole opened by the temperature responsive member and the normally open orifice at low temperatures, a large amount of air can be quickly discharged.

  An embodiment showing a specific example of the above technical means will be described (see FIG. 1). FIG. 1 shows a cross-sectional view of the float type steam trap of the present invention. This embodiment is applied to a free float type steam trap. The casing of the free float type steam trap is formed by a main body 1 and a lid 2 fastened to the main body 1 with a bolt, and has a valve chamber 3 inside. The main body 1 has an inlet 4, an outlet passage 5 and an outlet 6, and the inlet 4 communicates with the upper portion of the valve chamber 3.

  A valve seat 9 having a valve hole 7 and a normally open orifice 8 is screwed to the lid 2 on the lower side wall of the valve chamber 3. The valve hole 7 opens obliquely downward. In the orifice 8, the valve chamber side opening is close to the valve chamber side opening of the valve hole 7 and opens higher than the valve chamber side opening of the valve hole 7, and the outlet side merges in the middle of the valve hole 7. The opening area of the orifice 8 is formed such that the condensate generated during normal operation in which steam is sent to the steam piping system cannot be discharged. The lid 2 has an outlet passage 10, and the lower portion of the valve chamber 3 communicates with the outlet 6 from the valve hole 7 and the orifice 8 through the outlet passages 10 and 5. A hollow spherical float 11 for opening and closing the valve hole 7 is disposed in the valve chamber 3 in a free state. Two float seats 12 with which the float 11 abuts at a position where the valve hole 7 is closed are provided below the float 11 and on the side facing the front side of the drawing.

  A bimetal 13 as a temperature responsive member is disposed in the valve chamber 3. The bimetal 13 has a substantially U-shaped cross section and is fixed to the lid 2 with a screw 14 at one end. The bimetal 13 is deformed so that the U-shape is narrowed at high temperatures and does not interfere with the float 11, and is deformed so that the U-shape is expanded at low temperatures to lift the float 11 to open the valve hole 7.

  The operation of the free float steam trap of the above embodiment is as follows. When a large amount of low-temperature air and condensate flows into the valve chamber 3 as in the initial startup of the steam piping system, the bimetal 13 is deformed so that the U shape expands, and the float 11 is lifted to lift the valve hole 7. Open. Thereby, a large amount of low-temperature air and condensate are quickly discharged from the valve hole 7 and the orifice 8 to the outlet 6.

  When the temperature of the condensate flowing into the valve chamber 3 increases due to the discharge of the low-temperature air and the condensate, the bimetal 13 is deformed so that the U-shape is narrowed and does not interfere with the float 11. To the outlet 6. Condensate that cannot be discharged from the orifice 8 is discharged to the outlet 6 from the valve hole 7 that is opened and closed by the float 11 that rises and falls according to the amount of condensate in the valve chamber 3. When air flows into the valve chamber 3 and the temperature in the valve chamber 3 drops below a predetermined value, the bimetal 13 is deformed so that the U-shape expands, lifts the float 11 and opens the valve hole 7, From the hole 7 and the orifice 8, it quickly discharges to the outlet 6.

  In the above embodiment, the present invention is applied to the free float type steam trap, but can also be applied to a lever float type steam trap.

It is sectional drawing of the Example which applied the float type steam trap of this invention to the free float type steam trap.

Explanation of symbols

1 Body 2 Lid 3 Valve Chamber 4 Inlet 6 Outlet 7 Valve Hole 8 Orifice 9 Valve Seat 11 Float 13 Bimetal

Claims (1)

The casing forms an inlet, a valve chamber, and an outlet. A valve hole that communicates the valve chamber and the outlet is opened obliquely downward on the lower side wall of the valve chamber, and a float that opens and closes the valve hole is disposed in the valve chamber. In a temperature responsive member arranged indoors, which prevents the float from closing the valve hole at low temperatures and does not interfere with the float at high temperatures, the valve chamber side opening is close to the valve chamber side opening of the valve hole. A normally open orifice with an opening area large enough to discharge the condensate generated during normal operation that is opened above the valve chamber side opening and steam is sent to the steam piping system is provided Float type steam trap.

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