JPH09303692A - Float type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a float type steam trap having the automatic function of fully closing its valve immediately after a steam leak. SOLUTION: A casing composed of a main body 1 and a cover 2 defines therein an inlet 3, a valve chest 8 and an outlet 5. A drain valve opening 10 for connecting the valve chest and the outlet is formed in the lower part of the valve chest 8, and a float 11 for opening or closing the drain valve opening 10 is housed in the valve chest. The inlet 3 communicates with the upper part of the valve chest 8 through a down passage 6 and a riser passage 7. An auxiliary valve opening 13 for communication between the down passage 6 and the riser passage 7 is formed at the bottom of the down passage 6. A temperature reactive element 14 which displaces according to the fluid temperature is disposed in facing the auxiliary valve opening 13 to open or close the auxiliary valve opening 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes a difference in specific gravity between gas and liquid to drive valve means by a float accommodated in a valve chamber to automatically discharge drain generated in a steam piping system. The present invention relates to a float-type steam trap, and more particularly to a float-type steam trap equipped with a mechanism capable of completely closing immediately when steam leaks.

[0002]

2. Description of the Related Art In a float type steam trap, an inlet, a valve chamber and an outlet are formed by casing, and a drainage valve port communicating the valve chamber and the outlet is formed in the lower part of the valve chamber and the drainage valve port is formed. The float that opens and closes is housed in the valve chamber. When the drain flows into the valve chamber, the liquid level rises, so the float floats up and opens the drain valve port to drain the drain to the outside.When the drain is discharged and the liquid level in the valve chamber drops, the float floats. To prevent the steam from leaking out by closing the drain valve port.

If steam leaks in the trap, expensive energy is wasted. Therefore, it is closely monitored after the pipe is attached, and the trap leaking steam is repaired or actively replaced.

[0004]

However, in order to detect a steam leak at an early stage, it is necessary to constantly make a patrol inspection, which requires a great deal of labor.

SUMMARY OF THE INVENTION Therefore, a technical object of the present invention is to provide a float type steam trap having a mechanism capable of automatically and completely closing when a steam leak occurs.

[0006]

The technical means of the present invention taken to solve the above technical problems is to form an inlet, a valve chamber and an outlet by casing, and to connect the valve chamber and the outlet. A drain valve opening is formed in the lower part of the valve chamber, and a float that opens and closes the drain valve opening is accommodated in the valve chamber.The inlet communicates with the upper part of the valve chamber through the falling passage and the rising passage, and the rising passage and the rising passage. The auxiliary valve opening communicating with the passage is formed in the lower part of the falling passage, and a temperature responsive element that faces the auxiliary valve opening and is displaced according to the fluid temperature is arranged, and the auxiliary valve opening is opened and closed by the temperature responsive element. It is in a floating steam trap.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION When the float type steam trap of the present invention discharges only the drain without leaking steam, the drain is accumulated in the falling passage and the rising passage to the upper end of the rising passage. ing. At this time, since the ambient temperature of the temperature responsive element located in the drain is low, the auxiliary valve port is opened. Then, the accumulated drain rises by the drain flowing in from the inlet side and overflows into the valve chamber from the upper end of the passage, and due to the rise of the liquid level in the valve chamber, the float rises and the drain valve outlet Open to drain the drain. When drainage is discharged and the liquid level in the valve chamber drops,
The float descends and closes the drain valve opening to prevent steam leakage. On the other hand, when the float type steam trap of the present invention leaks gas from the drain valve port, the liquid level in the falling passage is lowered and the temperature responsive element is positioned in the steam. The temperature responsive element located in the steam has a high ambient temperature, so
Immediately close the auxiliary valve opening.

[0008]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). This embodiment is applied to a free float type steam trap. The lid 2 is fastened to the main body 1 with bolts (not shown) to form a casing. An inlet 3, an outlet passage 4 and an outlet 5 are formed in the body 1. Entrance 3
The outlet 5 is coaxially formed on the upper part of the main body 1. The main body 1 and the lid 2 form a falling passage 6, a rising passage 7 and a valve chamber 8 between the inlet 3 and the outlet passage 4. Entrance 3
Communicates with the upper part of the valve chamber 8 from the falling passage 6 through the rising passage 7.

A drain valve seat 9 is attached to a lower side wall of the valve chamber 8, and a drain valve port 10 opened in the drain valve seat 9 connects the valve chamber 8 to an outlet 5 through an outlet passage 4. A hollow spherical float 11 for opening and closing the drain valve opening 10 is housed in the valve chamber 8 in a free state. An auxiliary valve seat 12 is attached to the lower part of the falling passage 6, and an auxiliary valve port 13 opened in the auxiliary valve seat 12 connects the falling passage 6 and the rising passage 7. Auxiliary valve opening 1
The temperature responsive element 1 that opens and closes the auxiliary valve opening 13 facing the 3
4 is arranged. Although not shown, the temperature responsive element is a substantially disk-shaped closed body capsule, and is formed by filling a thin plate diaphragm and a thermal expansion / contraction liquid inside. A plurality of positions on the entire circumference of the temperature responsive element 14 are held by a holding guide 15, and the bottom surface of the holding guide 15 is fixed to the main body 1 by the auxiliary valve seat 12. The auxiliary valve opening 13 is closed by expanding the thermal expansion / contraction capsule 14 as a temperature responsive element, and the auxiliary valve opening 13 is opened by contracting.

When the free-float type steam trap of this embodiment discharges only the drain without leaking steam, the drain is provided in the falling passage 6 and the rising passage 7 up to the upper end of the rising passage 7. Since the ambient temperature is low, the temperature responsive element 14 located in the drain is contracted and the auxiliary valve port 13 is opened. The drain flowing from the inlet 3 causes the drain in the rising passage 7 to overflow into the valve chamber 8 and the liquid level in the valve chamber 8 rises. Then flow
The gutter 11 floats up, opens the drainage valve opening 10 and drains it out 5
To the outside. When the drain is discharged and the liquid level in the valve chamber 8 drops, the float 11 descends to close the drain valve port 10 and prevent steam from leaking. When steam leaks from the drain valve port 10, the liquid level in the falling passage 6 decreases. Then, the temperature responsive element 14 is positioned in the steam, and since the ambient temperature is high, the temperature responsive element 14 expands and immediately closes the auxiliary valve port 13 completely.

[0011]

The present invention has the following specific effects. As described above, according to the present invention, when steam leaks, it can be automatically and immediately closed, which is energy saving.

[Brief description of drawings]

FIG. 1 is a sectional view of a float type steam trap according to an embodiment of the present invention.

[Explanation of symbols]

 1 Main Body 2 Lid 3 Inlet 5 Outlet 6 Falling Passage 7 Rising Passage 8 Valve Chamber 10 Drainage Valve Port 11 Float 13 Auxiliary Valve Port 14 Temperature Response Element

Claims (1)

[Claims] 1. A casing is formed with an inlet, a valve chamber and an outlet, a drainage valve port communicating with the valve chamber and the outlet is formed in the lower part of the valve chamber, and a float for opening and closing the drainage valve port is provided in the valve chamber. In the housed one, the inlet communicates with the upper part of the valve chamber through the falling passage and the rising passage, and the auxiliary valve opening that connects the falling passage and the rising passage is formed in the lower part of the falling passage. A float-type steam trap characterized by arranging a temperature responsive element that is displaced according to temperature, and opening and closing the auxiliary valve port with the temperature responsive element.