JPH06241396A - Float type steam trap - Google Patents

Abstract

PURPOSE:To improve operation efficiency by constituting a float type steam trap which can open an exhaust valve even if the temperature sensing function of the exhaust valve is lost, by forming an exhaust valve port for the communication of a valve chamber to an outlet in the upper part of the valve chamber and arranging the exhaust valve having the specific constitution. CONSTITUTION:A cover member 2 is tightened on a body 1, and a valve casing having a valve chamber 3 inside is formed. At the upper part of the body 1, an inlet 4 and an outlet 5 are formed. Further, in the lower part of the valve chamber 3, a valve seat member 10 having a valve port 9 formed is arranged. The valve port 9 is opened and closed by a float 13 which moves vertically according to the liquid level. With this constitution, an exhaust valve port 15 for the communication of the valve chamber 3 to the outlet 5 is formed in the upper part of the valve chamber 3, and an exhaust valve 18 is arranged. As for the exhaust valve 18, the outer peripheral circles of a plurality of diaphragms 23 and 26 are fixed on a wall member 20, and an expandable medium 24 is introduced into between these elements, and each through hole 29 is formed on one diaphragm 26 and an exhaust valve 25 for opening and closing the exhaust valve port 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a float-type steam trap for automatically discharging condensate generated in various steam-using devices and steam pipes using a float, and more particularly to a trap of this type. The present invention relates to improvement of an exhaust valve provided. Flow
The tortoise type steam trap opens and closes the valve opening formed in the lower part of the valve chamber by the float floating on the liquid surface, and cannot eliminate the air accumulated in the upper part of the valve chamber. Condensate inflow into the valve chamber is blocked by this air, so the function of condensate drainage is lost, the operating efficiency of steam equipment decreases, defective products occur, and water hammer occurs. There is a problem of damage to equipment and piping. Therefore, an exhaust valve is required.

[0002]

2. Description of the Related Art The basic structure of a float type steam trap equipped with an exhaust valve is, for example, Japanese Patent Publication No. 52-46722.
It is known from the publication. As can be understood from the publication, a valve casing forms an inlet, a valve chamber, and an outlet, and a valve port communicating the valve chamber with the outlet is formed in the lower part of the valve chamber. An exhaust valve body that opens and closes the valve opening and connects the valve chamber to the outlet is formed in the upper part of the valve chamber, and an exhaust valve body that opens and closes the exhaust valve opening and a bimetal that deforms according to ambient temperature and controls the exhaust valve body. The exhaust valve is arranged above the valve chamber.

[0003]

In the above, when the bimetal is damaged and the temperature responsive function according to the ambient temperature cannot be achieved, the exhaust valve body closes the exhaust valve opening by the fluid pressure on the inlet side. However, there is a problem that air cannot be removed and the condensate discharge function is lost.

Therefore, the technical problem of the present invention is to make it possible to open the exhaust valve even if the exhaust valve loses the temperature response function.

[0005]

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 by valve casing, and to communicate the valve chamber with the outlet. In the float type steam trap in which a valve opening is formed in the lower part of the valve chamber and the valve is opened and closed by a float arranged in the valve chamber, an exhaust valve port communicating the valve chamber with the outlet is formed in the upper part of the valve chamber. Then, with the wall member,
First and second diaphragms having outer peripheral edges fixed to the wall member, an expansion medium enclosed between the first diaphragm and the wall member, and an exhaust valve body connected to the second diaphragm to open and close an exhaust valve port And an exhaust valve, which is provided on the second diaphragm and the exhaust valve body and has a through hole that connects the surface of the first diaphragm that is not in contact with the expansion medium and the exhaust valve port, to the upper portion of the valve chamber. is there.

[0006]

The operation of the above technical means is as follows.
When the temperature in the valve chamber is high, the expansion medium enclosed between the wall member and the first diaphragm expands and displaces the first and second diaphragms toward the exhaust valve opening side, and the expansion medium is attached to the second diaphragm. The exhaust valve body closes the exhaust valve port. Condensate in the valve chamber is removed from the valve opening and closing due to the float rising and falling. When the temperature in the valve chamber becomes low, the expansion medium contracts, the exhaust valve body opens the exhaust valve opening due to the fluid pressure on the inlet side, and condensed water and air are removed from the exhaust valve opening. Condensate in the valve chamber is also removed from the valve opening and closing caused by the floating float.

In the present invention, the first diaphragm may be broken as a state in which the temperature responsive function according to the ambient temperature is lost. In this case, the space in which the expansion medium is enclosed communicates with the outlet from between the first diaphragm and the second diaphragm through the through hole and the exhaust valve port, so that the expansion medium flows out to the outlet and the exhaust valve body is connected to the fluid on the inlet side. The exhaust valve opening is opened by the pressure so that the fluid on the inlet side can be discharged. Even when the second diaphragm is broken, the valve chamber communicates with the outlet from between the first diaphragm and the second diaphragm through the through hole and the exhaust valve port, so that the fluid on the inlet side can be discharged.

[0008]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). The lid member 2 is fastened to the main body 1 with bolts (not shown) to form a valve casing having the valve chamber 3 inside. An inlet 4 and an outlet 5 are formed on the main body 1 on the same axis. A screen 6 and a float cover 8 having a through hole 7 are arranged above the valve chamber 3. The inlet 4 communicates with the valve chamber 3 from the screen 6 through the through hole 7. A valve seat member 10 having a valve opening 9 is screwed to the lower portion of the valve chamber 3. The valve chamber 3 communicates with the outlet 5 from the valve opening 9 through the rising passage 11. Reference numeral 12 is a plug made of a hard material having corrosion resistance. A closed spherical float 13 that floats and descends according to the liquid level to open and close the valve opening 9 is arranged in the valve chamber 3 in a free state. Reference numeral 14 is a float seat which is held by the float 13 at a position where it closes the valve opening 9.

A valve seat member 16 having an exhaust valve port 15 opened is screwed to the lid member 2. The valve chamber 3 communicates with the outlet 5 from the exhaust valve port 15 through the communication passage 17. Float Cover 8
An exhaust valve 18 is disposed above the. The exhaust valve 18 is sealed in a wall member 20 having an inlet 19, a plug member 21 for sealing the inlet 19, a first diaphragm 23 forming an accommodation chamber 22 between the wall member 20, and the accommodation chamber 22. The expanded medium 24, the exhaust valve body 25 that opens and closes the exhaust valve port 15 by being seated on and off the valve seat member 16, the second diaphragm 26 that fixes the exhaust valve body 25, and the first and second diaphragms 23, 26.
The upper wall member 27 is fixed to the wall member 20 by sandwiching the outer peripheral edge of the upper wall member 27, and the stopper 28 fixed to the wall member 20. The through hole 2 is formed in the exhaust valve body 25 and the second diaphragm 26.
9 is open. The expansion medium 24 is formed of water, a liquid having a boiling point lower than that of water, or a mixture thereof. The exhaust valve 18 is housed in a top-end cylindrical mounting member 30 that is fixed by being sandwiched between the lid member 2 and the valve seat member 16, and is fixed by a snap ring 31. Two fluid passage windows 32 are formed on both sides of the upper end of the mounting member 29. Reference numerals 33 and 34 are plugs made of a hard material having corrosion resistance.

When the temperature in the valve chamber 3 is high, the expansion medium 24
Expands, and the exhaust valve body 25 closes the exhaust valve port 15. The float 13 floats and descends according to the liquid level in the valve chamber 3,
Open and close. When the temperature in the valve chamber 3 becomes low, the expansion medium 2
4 contracts, the exhaust valve body 25 opens the exhaust valve opening 15, and discharges condensed water and air from the exhaust valve opening 15 to the outlet 5. The float 13 floats and descends according to the liquid level in the valve chamber 3 to open and close the valve port 9.

When the first diaphragm 23 is broken, the space in which the expansion medium 24 is enclosed is separated from the first diaphragm 23 and the second diaphragm 23.
Through hole 29 and exhaust valve port 1 from between diaphragm 26
5, the expansion medium 24 flows out to the outlet 5, and the exhaust valve body 25 opens the exhaust valve port 15 by the fluid pressure on the inlet 4 side so that the fluid on the inlet 4 side can be discharged. In addition, when the second diaphragm 26 breaks, the valve chamber 3
Communicates with the outlet 5 through the through hole 29 and the exhaust valve port 15 from between the first diaphragm 23 and the second diaphragm 26, so that the fluid on the inlet 4 side can be discharged.

[0012]

The present invention produces the following unique effects. As described above, the float type steam trap according to the present invention can be opened when the temperature responsive function of the exhaust valve is lost, so that the operating efficiency of steam-using equipment is reduced, defective products are produced, and water No hammer will occur.

[Brief description of drawings]

FIG. 1 is a sectional view of a float type steam trap of the present invention.

[Explanation of symbols]

 1 Main Body 2 Lid Member 3 Valve Chamber 4 Inlet 5 Outlet 9 Valve Port 13 Float 15 Exhaust Valve Port 18 Exhaust Valve 20 Wall Member 23 First Diaphragm 24 Expansion Medium 25 Exhaust Valve Disc 26 Second Diaphragm 29 Through Hole

Claims (1)

[Claims] 1. A valve casing forms an inlet, a valve chamber, and an outlet, and a valve port communicating the valve chamber with the outlet is formed in the lower part of the valve chamber, and a valve arranged in the valve chamber opens and closes the valve port. In the float type steam trap, an exhaust valve port communicating the valve chamber with the outlet is formed in the upper part of the valve chamber, and a wall member and first and second diaphragms having respective outer peripheral edges fixed to the wall member, An expansion medium enclosed between the first diaphragm and the wall member, an exhaust valve body connected to the second diaphragm to open and close an exhaust valve opening, and a second
An exhaust valve comprising a through hole communicating with an exhaust valve port and a surface of the diaphragm and the exhaust valve body that is not in contact with the expansion medium of the first diaphragm is arranged at the upper part of the valve chamber. -Mutrap.