JPH04236896A - Heat-reaction type steam trap - Google Patents

Abstract

PURPOSE:To increase the lift of a piston by means of a small diaphragm. CONSTITUTION:A tapering chamber is formed between a diaphragm 11 and a piston 17 and filled with a fluid material 15 formed of fine powder of fluororesin. Since the fluid material 15 is deformed in a volume and moved from a wide area to a narrow area, the piston 17 is widely displaced as against displacement of the diaphragm 11.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a steam trap that is attached to various steam-using equipment or steam piping systems to automatically discharge condensate generated therein, and in particular, the present invention relates to a steam trap that is attached to various steam-using equipment or steam piping systems to automatically discharge condensate generated therein. This invention relates to a thermally responsive steam trap that opens and closes to discharge condensate at a desired temperature to the outside of the system.

0002

2. Description of the Related Art A conventional thermally responsive steam trap is disclosed, for example, in Japanese Patent Application Laid-open No. 168992/1983. This is a device in which an expansion medium is sealed between a wall member fixed to the valve casing and a diaphragm, and a valve member that opens and closes the valve port is attached to the diaphragm, allowing high-temperature steam to flow into the casing. When the temperature rises, the expansion medium expands, displacing the diaphragm, and closing the valve port with the valve member to prevent steam from being discharged.When low-temperature condensate flows in, the expansion medium contracts.
The valve member opens the valve port and discharges the water out of the system.

0003

[Problem to be solved by the invention] In the above-mentioned device, the displacement of the diaphragm and the lift of the valve member are proportional, so in order to increase the lift, a diaphragm with a large outer diameter is required, and the valve casing also needs to be used. There is a growing problem.

The technical problem of the invention is therefore to make it possible to increase the lift of the valve member using a small diaphragm.

[0005]

[Means for Solving the Problems] 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 in a valve casing, and to communicate the valve chamber and the outlet. two upper and lower wall members with a diaphragm sandwiched between them are placed in the valve chamber, and the upper chamber between the upper wall member and the diaphragm is made of a mixture of water and a fluid with a boiling point lower than water. The expansion medium is enclosed in a seal that can be slid up and down inside the lower wall member.
A lower chamber between the diaphragm and the seal member is formed into a tapered shape, a fluid made of fine powder of fluororesin is sealed in the lower chamber, and the valve member for opening and closing the valve port is sealed. This is connected to the base member.

[0006]

[Operation] The operation of the above technical means is as follows. When the temperature of the fluid flowing in from the inlet is high, the expansion medium expands and displaces the diaphragm and the fluid, and the valve means closes the valve port to prevent the hot fluid, ie, steam, from escaping. On the other hand, when low-temperature fluid flows in, the expansion medium contracts, the valve means opens the valve port, and the low-temperature fluid is discharged from the outlet.

[0007] Since the lower chamber in which the fluid is placed is tapered, the volume of the fluid is deformed and moved from a wide area to a narrow area in response to the displacement of the diaphragm due to expansion and contraction of the expansion medium. The valve means displacing through can be displaced to a large extent. Therefore, even with a small diameter diaphragm, the valve means can be largely displaced, and the valve case
Thing can be made small.

[0008]

[Example] An example showing a specific example of the above technical means will be described (see FIG. 1). Inlet 2 and outlet 3 in valve casing 1
and a 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 wall 5 formed between the valve chamber 4 and the outlet 3. A valve port 7 and a plurality of through holes 8 that communicate 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 passes through the through hole 8 and the valve port 7.
communicate with.

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

The inside of the lower wall member 10 consists of an upper large diameter chamber, a lower small diameter chamber, and a tapered chamber between them, with a seal in the small diameter chamber.
1. Place the lever member 14. Between the diaphragm 11 and the seal member 14 is a fluid 15 made of fine powder of fluororesin.
is included.

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

FIG. 1 shows the valve in a closed state. That is,
The expansion medium 13 expands to displace the diaphragm 10 downward, displacing the piston 17 downward via the fluid 15 and the seal member 14, and closing the valve port 7 to prevent the high temperature fluid, ie, steam, from flowing out. do. When the fluid temperature becomes lower than a predetermined value due to heat radiation or the like, the expansion medium 13 contracts, and the piston 17 is displaced upward by the spring 16 to open the valve port 7 and discharge the low-temperature fluid, that is, the low-temperature condensate, to the outlet 3. .

[0013]

[Effects of the Invention] The present invention produces the following unique 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 made of fine powder of fluororesin, thermal expansion of the fluororesin can also be used to displace the valve member. Therefore, this also allows the valve member to be largely displaced.

[Brief explanation of the drawing]

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

[Explanation of symbols]

1 Valve casing 2 Entrance 3 Exit 4 Valve chamber 6 Valve seat member 7. Oral address 9 Upper wall member 10 Lower wall member 11 Diaphragm 13. Expansion medium 14 Seal member 15 Fluid 17 Piston

Claims (1)

[Claims] [Claim 1] A valve casing forms an inlet, a valve chamber, and an outlet, a valve port that communicates the valve chamber and the outlet is formed, and two upper and lower wall members with a diaphragm sandwiched therebetween are arranged in the valve chamber. , an expansion medium formed of a mixture of water and a fluid with a boiling point lower than water is sealed in an upper chamber between the upper wall member and the diaphragm, and a seal member is arranged in the lower wall member so as to be slidable up and down. A lower chamber between the diaphragm and the seal member is formed into a tapered shape, a fluid made of fine powder of fluororesin is sealed in the lower chamber, and the valve member that opens and closes the valve port is connected to the seal member. A thermally responsive steam trap.