JP2003307296A - Float type steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a float type steam trap capable of quickly discharging a large amount of low temperature air and discharging low temperature condensed water below a valve hole at a downtime. <P>SOLUTION: An inlet 5, a valve chest 6 and an outlet 7 are formed by a casing constituted of an inlet side member 1 and an outlet side member 2. The valve hole 8, an orifice 9 and an outlet passage 10 are formed on the outlet side member 2. The inlet 5 is communicated with the upper part of the valve chest 6. The lower part of the valve chest 6 is communicated with the lower outlet 7 via the valve hole 8 and the lower outlet passage 10, and the lower end of the valve chest 6 is communicated with the lower outlet 7 via the orifice 9. A hollow spherical float 11 that opens/closes the valve hole 8 is arranged inside the valve chest 6 in a free state. A bimetallic strip 13 as a temperature responsive member is arranged inside the valve chest 6. The bimetallic strip 13 does not interfere with the float 11 but closes the orifice 9 at the other end side at a high temperature while, it opens the orifice 9 at a low temperature and lifts the float 11 for opening the valve hole 8. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam trap for automatically discharging condensate generated in a steam piping system.
In particular, the present invention relates to a float type steam trap that opens and closes a valve hole directly or through a valve member or the like with an open or closed float, and does not close the valve hole at a low temperature. The float type steam trap uses the difference in specific gravity between steam and condensate to automatically discharge only condensate without discharging steam, but when air, which is a non-condensed gas, flows into the valve chamber, There is a problem that air binding occurs because the valve hole is closed as in the case of steam. 2. Description of the Related Art Conventionally, Japanese Utility Model Publication No.
A technique as shown in Japanese Patent Application Laid-Open Publication No. H10-26095 has been used. This means that an inlet, a valve chamber, and an outlet are formed in a casing, and a valve hole communicating the valve chamber and the outlet is opened and closed by a float disposed in the valve chamber. This prevents the float from closing and does not interfere with the float at high temperatures. [0003] In the above-mentioned conventional float type steam trap, the temperature responsive member disposed in the valve chamber prevents the float from closing the valve hole at a low temperature, so that low-temperature air flows from the valve hole. Although this is to prevent air binding by discharging, only low-temperature air is discharged from the valve hole, so time is required especially when a large amount of low-temperature air must be discharged, such as at the initial startup of a piping system. There was a problem that took. Further, since the condensate is stored below the valve hole in the valve chamber, there is a problem that the low-temperature condensate freezes and breaks the float when the piping system is stopped when the air supply is stopped. Accordingly, it is an object of the present invention to provide a float type steam trap which can quickly discharge a large amount of low-temperature air and can discharge low-temperature condensate below a valve hole at rest. Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is to form an inlet, a valve chamber, and an outlet with a casing, and to communicate the valve chamber with the outlet. The valve hole is opened and closed by a float disposed in the valve chamber, and a temperature responsive member disposed in the valve chamber prevents the float from closing the valve hole at low temperatures so as not to interfere with the float at high temperatures. Is formed at the lower end of the valve chamber, and the temperature responsive member opens the orifice at a low temperature and closes the orifice at a high temperature. A float type steam trap according to the present invention is a valve chamber which communicates between a valve chamber and an outlet by a temperature responsive member which prevents a float from closing a valve hole at a low temperature and does not interfere with the float at a high temperature. The orifice at the lower end is opened at a low temperature and closed at a high temperature. Therefore, at low temperatures, a large amount of low-temperature air can be quickly discharged from the valve hole and the orifice. Also, at the time of suspension when the temperature becomes low, the low temperature condensate below the valve hole can be discharged from the orifice at the lower end of the valve chamber. An embodiment showing a specific example of the above technical means will be described (see FIG. 1). FIG. 1 is a sectional view of a float type steam trap of the present invention. This embodiment is applied to a free float steam trap. The casing of the free-float type steam trap is formed by fixing the inlet-side member 1 and the outlet-side member 2 with the attachment member 4 with the seal member 3 interposed therebetween for keeping the airtight. Inlet side member 1
An inlet 5 is formed in the inlet side member 1 and a valve chamber 6 is formed between the inlet side member 1 and the outlet side member 2. The inlet 5 communicates with the upper part of the valve chamber 6. The lower part of the valve chamber 6 communicates with the lower outlet 7 through the valve hole 8 and the lower outlet passage 10, and the lower end of the valve chamber 6 communicates with the lower outlet 7 through the orifice 9. A hollow spherical float 11 for opening and closing the valve hole 8 is disposed in the valve chamber 6 in a free state. The float seat 12 with which the float 11 abuts at the position where the valve hole 8 is closed is float 1
Two are provided below 1 on the front side and the side facing the drawing. A bimetal 13 is disposed in the valve chamber 6 as a temperature responsive member. The bimetal 13 has a cross section substantially in the shape of a letter and has one end fixed to the outlet side member 2 with a screw 14. The bimetal 13 is deformed so as to narrow the "L" shape at high temperature and does not interfere with the float 11 and closes the orifice 9 at the other end side, and is deformed to expand the "L" shape at low temperature and opens the orifice 9. At the same time, the float 11 is lifted to open the valve hole 8. The operation of the free-float type steam trap of the above embodiment is as follows. When a large amount of low-temperature air and condensate flows into the valve chamber 6 as in the initial startup of the steam piping system, the bimetal 13 is deformed so as to expand in the shape of a letter and opens the orifice 9 and floats. 11
Is lifted to open a valve hole 8, and a large amount of low-temperature air and condensate are quickly discharged from the valve hole 8 and the orifice 9 to the outlet 7. When the temperature of the condensate flowing into the valve chamber 6 increases due to the discharge of the low-temperature air and the condensate, the bimetal 13 is deformed so as to have a narrow "S" shape so that it does not interfere with the float 11 and the other end. Close the orifice 9 on the side. The float 11 rises and falls according to the amount of condensate in the valve chamber 6 to open and close the valve hole 8, and discharges condensate from the valve hole 8 to the outlet 7. When the air flows into the valve chamber 6 and the temperature in the valve chamber 6 drops below a predetermined level, the bimetal 13 is deformed so as to expand its "S" shape to open the orifice 9 and lift the float 11 to lift the valve hole. 8 is opened, and low-temperature air is supplied to the valve hole 8 and the orifice 9.
From the outlet 6 quickly. When the temperature in the valve chamber 6 drops below a predetermined value during the stoppage of the air supply of the piping system, the bimetal 13 is deformed so as to expand the "S" shape, opening the orifice 9 and opening the float 11. By lifting the valve hole 8, the low-temperature condensate is discharged from the valve hole 8 and the orifice 9 to the outlet 6. In the above embodiment, the present invention is applied to a free-float type steam trap, but can also be applied to a lever-float type steam trap. The present invention has the following specific effects. According to the present invention as described above, by opening the orifice at the lower end of the valve chamber that communicates the valve chamber and the outlet by the temperature responsive member that prevents the float from closing the valve hole at low temperatures,
An excellent effect that a large amount of low-temperature air can be quickly discharged and a low-temperature condensate below the valve hole can be discharged at the time of suspension.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an embodiment in which a float type steam trap of the present invention is applied to a free float type steam trap. [Description of Signs] 1 Inlet-side member 2 Outlet-side member 5 Inlet 6 Valve chamber 7 Outlet 8 Valve hole 9 Orifice 11 Float 13 Bimetal

Claims (1)

Claims: 1. An inlet, a valve chamber, and an outlet are formed by a casing, and a valve hole communicating the valve chamber and the outlet is opened and closed by a float disposed in the valve chamber, and a temperature-responsive element disposed in the valve chamber. In a member in which the float prevents the valve hole from closing at low temperature and does not interfere with the float at high temperature, an orifice communicating with the valve chamber and the outlet is formed at the lower end of the valve chamber, and the orifice at low temperature is formed by the temperature responsive member. Float type steam trap characterized by opening and closing the orifice at high temperature.