JP2001082690A - Disc type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a bimetal ring from being hit by a valve disc. SOLUTION: A valve disc 11 is arranged in a transforming room 4 formed of inner and outer ring valve seats 6, 7 and a cover member 5, a bimetal ring 13 with ends is arranged on a conical slope part 12 formed on an outer periphery of the outer ring valve seat 7, and a ring plate 14 is arranged between the valve disc 11 and the bimetal ring 13. An outside diameter of the valve disc 11 is larger than an outside diameter of the outer ring valve seat 7, and the valve disc 11 has 12 through holes 15 vertically communicated on its outer periphery. Respectively parts of the through holes 15 are positioned between an inner periphery and an outer periphery of the outer ring valve seat 7. Steam passing at high speed between the outer ring valve, seat 7 and the valve disc 11 can turn around to the transforming room 4 from a clearance between the through holes 15 of the valve disc 11, and accordingly, quantity of steam passing between the ring plate 14 and the valve disc 11 is reduced. Consequently, the ring plate 14 becomes harder to be drawn upward, and the bimetal ring 13 becomes harder to be hit by the valve disc 11 through the ring 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 inner and outer ring valve seats and a lid member, A bimetallic 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 bimetallic ring. The outer diameter of the valve disc is smaller than the outer diameter of the outer ring valve seat in a disc-type steam trap that removes air binding by separating the valve disc from the inner and outer ring valve seats through the annular plate at low temperature by cooperation with the action. A disc-type steam trap characterized in that it is formed large, and a through-hole is provided on the outer periphery of the valve disc to communicate the upper and lower portions, and a part of the through-hole is located between the inner periphery and the outer periphery of the outer ring valve seat. .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The air binding is eliminated by the bimetallic ring moving up along the slope at a low temperature, lifting the valve disc through the annular plate and releasing the valve seat from the inner and outer ring valve seats. It is. 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 passing at a high speed between the outer ring valve seat and the valve disc can flow into the variable pressure chamber from the through hole of the valve disc, so that a small amount of steam passes between the annular plate and the valve disc. Become. for that reason,
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 disk-shaped valve disk 11 which is separated from and 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 disk 11 is
Its outer diameter is larger than the outer diameter of the outer ring valve seat 7, and has twelve through holes 15 communicating vertically in the outer periphery. A part of each of the through holes 15 is located between the inner circumference and the outer circumference of the outer ring valve seat 7.

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 valve disc 11 through the annular plate 14 to separate the valve disc 11 from the inner and outer ring valve seats 6, 7 and to open the valve disc. 3
To be discharged. When the high-temperature condensate flows in, the bimetallic ring 13 expands and moves down the slope 12 as shown in FIG.
As the bimetallic ring 13 moves downward, the annular plate 14 also moves downward, 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, since the steam can flow from the through hole 15 of the valve disk 11 to the variable pressure chamber 4, the amount of steam passing between the annular plate 14 and the valve disk 11 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. And the transformation room 4
When the internal steam is condensed due to heat radiation and the steam pressure is reduced, the valve disc 11 is separated from the inner and outer ring valve seats 6, 7 and opened. Such an on-off valve cycle is repeated.

[0011]

As described above, according to the present invention, the outer diameter of the valve disk is formed to be larger than the outer diameter of the outer ring valve seat, and a through-hole is provided on the outer periphery of the valve disk so as to communicate vertically and a part of the through-hole. Is located between the inner circumference and the outer circumference of the outer ring valve seat, so that steam passing at high speed between the outer ring valve seat and the valve disk flows from the through hole of the valve disk into the variable pressure chamber, and the annular plate is formed. And the amount of passage between the valve disc and the valve disc 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 plan view of the valve disk 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 portion 13 Bimetal ring 14 Annular plate 15 Through hole

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, The outer diameter of the disk is formed larger than the outer diameter of the outer ring valve seat, and a through hole is provided on the outer periphery of the valve disk so that the upper and lower portions communicate with each other. A disc-type steam trap characterized by having been made.