JP2001141188A - Disc type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a bimetallic ring difficult to be struck by a valve disc. SOLUTION: A valve disc 11 is arranged within a pressure transformation chamber 4 formed by inner and outer annular valve seats 6, 7 and a cover member 5. An ended bimetallic ring 13 is arranged on a conical oblique surface part 12 formed on an outer periphery of the outer annular valve seat 7. An annular plate 14 is arranged between the valve disc 11 and the bimetal ring 13. The valve disc 11 has a plurality of foot parts 15 which are projected downward on the outer periphery and are located at the outside of the outer annular valve seat 7. The foot parts 15 of the valve disc 11 are located on an upper side of the annular plate 14. Because steam passing at high speed between the outer annular valve seat 7 and the valve disc 11 can be spread from gaps among the foot parts 15 formed on the valve disc 11 to the pressure transformation chamber 4, steam amount passing between lower surfaces of the foot parts 15 of the valve disc 11 and an upper surface of the annular plate 14 is reduced. Therefore, the annular plate 14 is hardly sucked to an upper side and so the bimetallic ring 13 is hardly struck b the valve disc 11 via the annular plate 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk type steam for automatically discharging condensate generated in a steam piping system by opening and closing a valve disk in response to a pressure change in a transformation chamber, that is, a thermodynamic steam chamber. The present invention relates to a trap, and more particularly to a trap capable of eliminating air binding using a bimetal.

Disc-type steam traps are designed to automatically open and close a valve disc which is seated and demounted from a valve seat surface comprising inner and outer ring valve seats by a pressure change in a variable pressure chamber formed behind the valve disc. It automatically drains water. In this device, even if air flows in at the time of starting, the valve closes instantly as in the case of steam, and once the valve is closed, the air does not cause a condensation action unlike steam, so that it cannot be opened thereafter. So-called air binding occurs. Therefore, conventionally, this air binding is eliminated by using a bimetal.
That is, the valve disc is forcibly lifted and opened at a low temperature by utilizing a bending action caused by a temperature change of the bimetal so as not to interfere with the valve disc at a high temperature.

[0003]

2. Description of the Related Art An example of this is disclosed in Japanese Patent Publication No. 50-8809. What is disclosed herein is to dispose an end bimetal ring on a conical slope formed on the outer periphery of the outer ring valve seat, arrange an annular plate between the valve disc and the bimetal ring, and set the slope and temperature The air binding is eliminated by cooperating with the expansion and contraction action of the bimetal ring due to the change. In other words, the bimetallic ring moves up along the slope at low temperatures, lifts the valve disk through the annular plate and opens the valve from the inner and outer ring valve seats, and moves down along the slope at high temperatures, No interference with valve disc.

[0004]

SUMMARY OF THE INVENTION In the above prior art,
There is a problem that the lower part of the bimetallic ring that slides on the slope is worn or the bimetallic ring is damaged. In other words, the disc-type steam trap reduces the pressure between the inner and outer ring valve seats and the valve disk by the high-speed passage of steam between the inner and outer ring valve seats and the valve disk, and also causes the steam to flow into the variable pressure chamber. The valve is closed by increasing the pressure in the transformer chamber, but when the steam goes around the transformer chamber, it passes at high speed between the annular plate and the valve disk, so that the annular plate is sucked upward, This is because the bimetallic ring is hit by the valve disc via the annular plate. Accordingly, a technical problem of the present invention is to make it difficult for a bimetallic ring to be hit by a valve disc.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is to dispose a valve disk in a variable pressure chamber formed by an inner and outer ring valve seat and a lid member, A bimetal ring with ends is placed on the conical slope formed on the outer periphery of the valve seat, and an annular plate is placed between the valve disk and the bimetal ring. In a disc-type steam trap that removes air binding by removing the valve disc from the inner and outer ring valve seats through the annular plate at low temperature by cooperation with the action, a plurality of downwardly projecting feet are formed on the valve disc. A disc-type steam trap, wherein the foot is located above the annular plate.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to eliminate air binding, the bimetallic ring moves upward along a slope at a low temperature, lifts the foot of the valve disc via the annular plate, and separates the valve disc from the inner and outer ring valve seats. This is performed by opening the valve. The bimetallic ring expands at high temperatures and moves down the slope, and the annular plate also moves down with the downward movement of the bimetallic ring, so that the bimetallic ring and the annular plate do not interfere with the valve disk. At this high temperature, the steam that passes at a high speed between the outer ring valve seat and the valve disc can flow into the variable pressure chamber from the space between the feet formed on the valve disc. The amount that passes between the lower surface and the upper surface of the annular plate is reduced. Therefore, the annular plate is less likely to be sucked upward, and the bimetallic ring is less likely to be hit by the valve disc via the annular plate.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). Entrance 2 on the same axis as body 1
And an outlet 3, and a transforming chamber 4 communicating with the inlet 2 and the outlet 3 is formed by the lid member 5 and the main body 1. An inner ring valve seat 6 and an outer ring valve seat 7 are formed concentrically and in the same plane at the opening ends of the inlet 2 and the outlet 3 on the side of the transformer chamber 4, and an annular groove 8 is formed therebetween. The inlet 2 communicates with the variable pressure chamber 4 via an inlet passage 9 formed in the inner ring valve seat 6, and the variable pressure chamber 4 communicates with the outlet 3 via an outlet passage 10 formed from a part of the annular groove 8.

[0008] A valve disk 11 which is detachably seated on the inner and outer ring valve seats 6 and 7 is arranged in the variable pressure chamber 4. A conical slope 12 is formed on the outer periphery of the outer ring valve seat 7, a bimetal ring 13 having ends is arranged, and an annular plate 14 is arranged between the bimetal ring 13 and the valve disk 11. The valve disc 11 has a plurality of feet 15 projecting downward on the outer periphery thereof and located outside the outer ring valve seat 7. The foot 15 of the valve disc 11 is
4 above.

The operation of the above embodiment will be described. When the temperature of the trap body is low, the bimetal ring 13 is closed and the slope 1 is closed.
2 and lifts the cylindrical portion 15 of the valve disc 11 through the annular plate 14 so that the valve disc 11 is
From the outlet passage 1
Discharge from 0 to outlet 3. When hot condensate flows in,
As shown in FIG. 1, the bimetallic ring 13 is expanded and the slope portion 1 is expanded.
2 and the annular plate 14 also moves downward with the downward movement of the bimetallic ring 13, so that the bimetallic ring 13 and the annular plate 14 do not interfere with the operation of the valve disk 11.

At this high temperature, the fluid pressure on the inlet 2 acting on the valve disk 11 via the inlet passage 9 causes
The valve disc 12 is opened from the inner and outer ring valve seats 6 and 7, and the high temperature condensate is discharged from the outlet passage 10 to the outlet 3. The high-temperature condensate is discharged and steam is generated between the inner and outer ring valve seats 6 and 7 and the valve disc 11.
At a high speed, the pressure between the inner and outer ring valve seats 6, 7 and the valve disk 11 decreases, and the pressure of the variable pressure chamber 4 increases by the steam flowing into the variable pressure chamber 4, The valve disc 11 is seated and closed on the inner and outer ring valve seats 6 and 7 to close the outlet passage 10. At this time, the steam can flow into the transformer chamber 4 from the space between the feet 15 formed on the valve disc 11, so that the space between the lower surface of the feet 15 of the valve disc 11 and the upper face of the annular plate 14 is formed. The amount of passage is reduced. Therefore, the annular plate 14 is less likely to be sucked upward, and the bimetallic ring 13 is less likely to be hit by the valve disc 11 via the annular plate 14. Then, when the steam in the variable pressure chamber 4 is condensed due to heat radiation or the like and the steam pressure decreases, the valve disk 11 is separated from the inner and outer ring valve seats 6 and 7 and opened. Such an on-off valve cycle is repeated.

[0011]

As described above, according to the present invention, since a plurality of downwardly projecting feet are formed on the valve disc and the feet are located above the annular plate, the outer ring valve seat and the valve disc are formed. The steam passing at high speed can flow into the transformer chamber from the space between the feet formed on the valve disc, so that it passes between the lower face of the foot of the valve disc and the upper face of the annular plate. The amount is reduced. Therefore, the annular plate is less likely to be sucked upward, and the bimetallic ring is less likely to be hit by the valve disc via the annular plate. Therefore, it is possible to provide a disc-type steam trap that can reduce abrasion and breakage of the bimetal ring and maintain a good air binding eliminating function for a long period of time.

[Brief description of the drawings]

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

FIG. 2 is a front view of the valve disc of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Inlet 3 Outlet 4 Transformation chamber 5 Lid member 6 Inner ring valve seat 7 Outer ring valve seat 8 Annular groove 9 Inlet passage 10 Outlet passage 11 Valve disk 12 Slope 13 Bimetal ring 14 Ring plate 15 Foot

Claims (1)

[Claims] 1. A valve disc is disposed in a variable pressure chamber formed by an inner and outer ring valve seat and a lid member, and a bimetal ring having ends is disposed on a conical slope formed on an outer periphery of the outer ring valve seat. Place an annular plate between the disc and the bimetallic ring,
In a disc-type steam trap, in which the valve disc is separated from the inner and outer ring valve seats through the annular plate at low temperature to eliminate air binding by cooperating with the slope portion and the expansion and contraction action of the bimetal ring due to temperature change, A disc-type steam trap, wherein a plurality of feet protruding downward are formed on a disc, and the feet are located above an annular plate.