JP2761674B2 - Thermo-responsive steam trap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam trap which is attached to various steam-using devices and steam piping systems and automatically discharges condensate generated therefrom. Relates to a thermally responsive steam trap that opens and closes to discharge condensate at a desired temperature out of the system.

[0002]

2. Description of the Related Art A conventional heat-responsive steam trap is disclosed, for example, in Japanese Patent Application Laid-Open No. Sho 60-168992.
This is a device in which an expansion medium is sealed between a wall member fixed to a valve casing and a diaphragm, and a valve member for opening and closing a valve port is attached to the diaphragm, so that high-temperature steam flows into the casing. When it comes, the expansion medium expands, displacing the diaphragm, closing the valve port by the valve member to prevent the discharge of steam, and when the low-temperature condensate flows in, the expansion medium contracts,
The valve member opens the valve port and discharges it out of the system.

[0003]

In the above arrangement, the displacement of the diaphragm is proportional to the lift of the valve member. To increase the lift, a diaphragm having a large outer diameter is required, and the valve casing is also required. There is a problem of growing.

Accordingly, it is an object of the present invention to make it possible to increase the lift of a valve member by using a small diaphragm.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is that a valve casing is formed with an inlet, a valve chamber and an outlet, and the valve communicates with the valve chamber and the outlet. An expansion formed by a mixture of water and a fluid having a boiling point lower than water in the upper chamber between the upper wall member and the diaphragm, with the upper and lower two wall members sandwiching the diaphragm disposed in the valve chamber. A medium is sealed, a sealing member is disposed in the lower wall member so as to be slidable up and down, a lower chamber between the diaphragm and the sealing member is tapered, and a fluid formed of fine powder of fluorine resin is formed in the lower chamber. And a valve member for opening and closing the valve port is urged against the seal member by a spring .

[0006]

The operation of the above technical means is as follows.
When the temperature of the fluid flowing from the inlet is high, the expansion medium expands, displacing the diaphragm and the fluid, closing the valve port by the valve means, and preventing the outflow of the hot fluid, that is, steam. On the other hand, when the low-temperature fluid flows in, the expansion medium contracts, the valve port is opened by the valve means, and the low-temperature fluid is discharged from the outlet.

[0007] Since the lower chamber in which the fluid is disposed is tapered, the fluid undergoes volume deformation from a wide area to a narrow area in response to displacement of the diaphragm due to expansion and contraction of the expansion medium. The valve means which is displaced via the valve can be largely displaced. Therefore, even if the diaphragm has a small diameter, the valve means can be largely displaced, and the valve case can be displaced.
Thing can be made small.

[0008]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). Inlet 2 and outlet 3 for valve casing 1
And the valve chamber 4 is formed inside. The inlet 2 and the outlet 3 are formed on the same axis. A valve seat member 6 is screwed to a partition 5 formed between the valve chamber 4 and the outlet 3. A valve port 7 and a plurality of through holes 8 communicating the valve chamber 4 with the valve port 7 are formed in the valve seat member 6. The inlet 2 communicates with the valve chamber 4 and the outlet 3 through the through hole 8 through the valve port 7.
Communicate with

The diaphragm 11 is sandwiched between the upper wall member 9 and the lower wall member 10 and the outer periphery thereof is welded (reference numeral 12).
Section). An expansion medium 13 is sealed between the upper wall member 9 and the diaphragm 11. The expansion medium 13 is formed from a mixture of water and a fluid having a lower boiling point than water.

The inside of the lower wall member 10 includes an upper large-diameter chamber, a lower small-diameter chamber, and a tapered chamber therebetween.
The tool member 14 is arranged. Between the diaphragm 11 and the seal member 14, a fluid 15 formed of fine powder of fluorine resin
Is enclosed.

A piston 17 is disposed below the seal member 14 as a valve member which is urged against the lower surface of the seal member 14 by a spring 16. The valve port 7 is opened and closed by the lower end of the piston 17.

FIG. 1 shows a valve closed state. That is,
The expansion medium 13 expands, displacing the diaphragm 10 downward, displacing the piston 17 downward through the fluid 15 and the seal member 14, and closing the valve port 7 to prevent the outflow of hot fluid, that is, steam. I do. When the fluid temperature becomes lower than a predetermined value due to heat radiation or the like, the expansion medium 13 contracts, the piston 17 is displaced upward by the spring 16 to open the valve port 7, and discharges the low temperature fluid, that is, the low temperature condensate to the outlet 3. .

[0013]

The present invention has the following specific effects. As described above, according to the present invention, the valve member can be largely displaced with respect to the displacement of the diaphragm. Since the fluid is formed of fine powder of fluororesin, the thermal expansion of the fluororesin can also be used for displacement of the valve member. Therefore, the valve member can be largely displaced by this as well. In addition, the flow formed by fine powder of fluororesin
The body has a boiling point of 327 for tetrafluoroethylene resin, for example.
Temperature, and can be used at higher temperatures than those made of synthetic rubber.
Can be used. Therefore, the maximum usable temperature
Can be increased.

[Brief description of the drawings]

FIG. 1 is a sectional view of a thermally responsive steam trap of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve casing 2 Inlet 3 Outlet 4 Valve room 6 Valve seat member 7 Valve port 9 Upper wall member 10 Lower wall member 11 Diaphragm 13 Expansion medium 14 Seal member 15 Fluid 17 Piston

Claims (1)

(57) [Claims] An inlet, a valve chamber, and an outlet are formed in a valve casing, a valve port communicating the valve chamber and the outlet is formed, and two upper and lower wall members sandwiching a diaphragm are disposed in the valve chamber. An expansion medium formed of a mixture of water and a fluid having a boiling point lower than that of water is sealed in the upper chamber between the wall member and the diaphragm, and a seal member is slidably arranged vertically in the lower wall member. A thermoresponsive steam in which the lower chamber between the sealing members is tapered, a fluid formed of fine powder of fluororesin is sealed in the lower chamber, and the valve member for opening and closing the valve port is urged to the sealing member by a spring. trap.