JPH0979492A - Float type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a float type steam trap furnishing an automatic blow mechanism of the pressure in a trap and the air in the trap. SOLUTION: In a float type steam trap in which an inlet 4, a valve chest 3, and an outlet 6 are formed of a casing which consists of a main body 1 and a lid 2, a drain valve hole 10 communicating the valve chest 3 and the outlet 6 is formed at the lower part of the valve chest 3, and a float 11 to open and close the drain valve hole 10 is housed in the valve chest 3, the second valve hole 12 to communicate the valve chest 3 and the outlet 6 is formed at the upper part of the valve chest 3, a valve member 13 to open and close the second valve hole 12 is provided at the outlet side of the second valve hole 12 being energized in the valve closing direction by a spring 14, a drain valve hole 17 to communicate the valve chest 3 and the outlet 6 is formed to the valve member 13, and a bimetal 18 to open and close the drain valve hole 17 is provided at the valve chest 3 side of the drain valve hole 17.

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 a steam using device or a steam transport pipe, and more particularly, when the pressure in the trap is higher than a predetermined pressure. The present invention relates to a device provided with a mechanism capable of automatically blowing the pressure and air in the trap when the air flows into the trap.

A float type steam trap is opened by applying a valve opening force equal to or more than the product of the area of the drain valve port and the fluid pressure acting on the valve port area to the float. . In other words, even when the valve opening area is constant, a larger valve opening force is required as the fluid pressure increases. Therefore, when the fluid pressure becomes higher than the maximum working pressure, the valve cannot be opened due to insufficient valve opening force. Also, when air flows into the float type steam trap, the air is a gas like steam, and it is cooled like steam and does not condense. Would. If the state in which the valve is kept closed continues, the condensate cannot be discharged from the steam piping system, resulting in damage to equipment and a decrease in productivity.

[0003]

2. Description of the Related Art Conventionally, therefore, a second valve opening is provided in addition to the valve opening and closing by a float, and a valve member biased in a valve closing direction by an elastic member is arranged on the outlet side of the second valve opening. By doing
When the pressure in the trap becomes higher than the specified pressure,
The valve member opens the second valve opening so that the pressure in the trap can be automatically blown. An example of this is Japanese Patent Fair 7-
No. 43077. In addition, an exhaust valve port is provided separately from the valve port that opens and closes with a float, and a bimetal as a temperature responsive member is arranged on the valve chamber side of the exhaust valve port, so that air flows into the trap and When the temperature drops, the exhaust valve opening is opened by the deformation effect of the bimetal so that the air in the trap can be blown automatically. An example of this is disclosed in Japanese Utility Model Publication No. 3-25518.

[0004]

As described above, there are a trap having an automatic blow mechanism for the pressure in the trap and a trap having an automatic blow mechanism for the air in the trap. There was nothing.

Accordingly, it is an object of the present invention to provide a float type steam trap having an automatic blow mechanism for the pressure and air in the trap.

[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 for opening and closing the drain valve opening is accommodated in the valve chamber, and a second valve opening communicating between the valve chamber and the outlet is formed in the upper part of the valve chamber. A valve member that opens and closes the valve port is disposed on the outlet side of the second valve port by an elastic member that urges in the valve closing direction, and an exhaust valve port that communicates the valve chamber and the outlet is formed in the valve member. A float-type steam trap is characterized in that a temperature responsive member for opening and closing the port is arranged on the valve chamber side of the exhaust valve port.

[0007]

The operation of the above technical means is as follows.
When the pressure in the valve chamber is smaller than the valve closing force of the elastic member of the valve member, the valve member closes the second valve port by the elastic member. In this state, the float floats down along with the liquid level in the valve chamber to open and close the drain valve opening. The temperature responsive member automatically opens and closes the exhaust valve port of the valve member according to the temperature in the valve chamber. That is, when the temperature in the valve chamber drops due to the inflow of air, the exhaust valve port is automatically opened to blow air, and when the temperature in the valve chamber rises due to the blow, the exhaust valve port is automatically closed. . On the other hand, when the pressure in the valve chamber becomes larger than the valve closing force of the valve member due to the elastic member, the valve member moves to the second
The valve port is automatically opened to blow the pressure inside the trap.

[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. A lid 2 is fastened to the main body 1 with bolts (not shown) and has a valve chamber 3 inside.
Form a thing. An inlet 4, an outlet passage 5, and an outlet 6 are formed in the main body 1. The inlet 4 and the outlet 6 are formed coaxially on the upper part of the main body 1. A blow passage 7 communicating with the outlet passage 5 is formed in the lid 2.

A drain valve seat 9 is attached to the lower side wall of the valve chamber 3, and a drain valve port 10 opened in the drain valve seat 9 connects the valve chamber 3 to an outlet 6 via an outlet passage 5. A hollow spherical float 11 for opening and closing the drain valve opening 10 is housed in the valve chamber 3 in a free state. The second valve opening 12 is opened in the lid 2, and the valve chamber 3 is communicated with the outlet 6 from the blow passage 7 through the outlet passage 5. A disc-shaped valve member 13 that opens and closes the second valve opening 12 is arranged on the outlet 6 side of the second valve opening 12. The valve member 13 is biased in the valve closing direction by a coil-shaped spring 14 as an elastic member. The spring 14 is arranged between the valve member 13 and a spring receiver 16 held by a plurality of ribs 15 formed on the inner circumference of the lid 2.

An exhaust valve port 17 that connects the valve chamber 3 side and the outlet 6 side is opened in the center of the valve member 13. Exhaust valve port 17 valve chamber 3
A disk-shaped inverted bimetal 18 as a temperature responsive member on the side
Place. A valve element 19 for opening and closing the exhaust valve port 17 is fixed to the center of the bimetal 18. The bimetal 18 is held by a holding member 21 fixed to the lid by a snap ring 20.

The inlet 4 communicates with the valve chamber 3 from a cylindrical screen 22 through a plurality of through holes 24 in the float cover 23.

The pressure in the valve chamber 3 depends on the elastic member 1 of the valve member 13.
When it is smaller than the valve closing force by 4, the valve member 13 closes the second valve opening 12 by the elastic member 14. In this state, the float 11 floats and descends together with the liquid level in the valve chamber 3 to open and close the drain valve port 10. Further, the bimetal 18 reverses according to the temperature in the valve chamber 3, and the valve body 19 automatically opens and closes the exhaust valve port 17 of the valve member 13. That is, when the temperature in the valve chamber 3 decreases due to the inflow of air, the exhaust valve port 17
Is automatically opened to blow air, and when the temperature in the valve chamber 3 rises due to the blow, the exhaust valve port 17 is automatically closed. On the other hand, the pressure in the valve chamber 3 is the elastic member 1 of the valve member 13.
4 is larger than the valve closing force by the valve member 13,
The valve port 12 is automatically opened to blow the pressure inside the trap.

[0013]

The present invention has the following specific effects. As described above, according to the present invention, the pressure in the trap and the air in the trap can be automatically blown, so that it is possible to prevent damage to the equipment and a decrease in productivity. Moreover, since the exhaust valve opening is formed in the valve member, a separate member for forming the exhaust valve opening is not required.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Main Body 2 Lid 3 Valve Chamber 4 Inlet 6 Outlet 10 Drainage Valve Port 11 Float 12 Second Valve Port 13 Valve Member 14 Spring 17 Exhaust Valve Port 18 Bimetal

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, a second valve port communicating the valve chamber and the outlet is formed in the upper part of the valve chamber, and a valve member for opening and closing the second valve port is attached to the outlet side of the second valve port with an elastic member in the valve closing direction. And a temperature responsive member that opens and closes the exhaust valve opening is disposed on the valve chamber side of the exhaust valve opening. -T-type steam trap.