JP4357703B2 - Disc type steam trap - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disc type steam trap that automatically discharges condensate generated in a steam piping system by opening and closing a valve disc according to a pressure change in a variable pressure chamber, that is, a thermodynamic steam chamber, and in particular, using a bimetal. It is related to the one that can eliminate air binding.
[0002]
The disc-type steam trap automatically controls the condensate by opening and closing the valve disc that is separated from the valve seat surface consisting of the inner and outer ring valve seats by the pressure change in the variable pressure chamber formed behind the valve disc. Are exhausted. In this case, even if air flows in at the time of starting, it closes instantaneously as in the case of steam, and once closed, air does not cause a condensing action unlike steam, so it cannot be opened thereafter. So-called air binding occurs. Therefore, conventionally, this air binding has been eliminated by using bimetal. In other words, the bending action caused by the temperature change of the bimetal is used to forcibly lift the valve disk at a low temperature to open the valve so as not to interfere with the valve disk at a high temperature.
[0003]
[Prior art]
An example of this is shown in Japanese Patent Publication No. 50-8809. What is disclosed here is that an end plate is disposed on a conical slope formed on the outer periphery of the outer ring valve seat, and an annular plate is disposed between the valve disk and the bimetal ring, and the slope and temperature are The air binding is eliminated by cooperating with the expansion / contraction action of the bimetal ring due to the change. That is, the bimetal ring moves up along the slope at low temperatures, lifts the valve disc through the annular plate and opens the valve from the inner and outer ring valve seats, moves down along the slope at high temperatures, No interference with the valve disc.
[0004]
[Problems to be solved by the invention]
In the above-mentioned conventional one, there is a problem that the lower part of the bimetal ring that is in sliding contact with the slope portion is worn or the bimetal ring is damaged. That is, in the disc type steam trap, the steam passes between the inner and outer ring valve seats and the valve disk at a high speed, so that the pressure between the inner and outer ring valve seats and the valve disk is lowered, and the steam flows into the variable pressure chamber. The valve is closed by increasing the pressure in the variable pressure chamber, but when the steam enters the variable pressure chamber, the annular plate is sucked upward in order to pass between the annular plate and the valve disk at a high speed. This is because the bimetal ring is struck by the valve disc through the annular plate. Therefore, the technical problem of the present invention is to make it difficult for the bimetal ring to be hit by the valve disk.
[0005]
[Means for Solving the Problems]
The technical means of the present invention taken in order to solve the above technical problem includes a conical shape formed on the outer periphery of the outer ring valve seat by arranging a valve disk in a variable pressure chamber formed by the inner and outer ring valve seats and the lid member. A bimetallic ring with ends is arranged on the slope of the ring, and an annular plate is arranged between the valve disc and the bimetal ring, and the ring is opened at low temperature by cooperation with the slope and the expansion / contraction action of the bimetal ring due to temperature change. In a disc-type steam trap that eliminates air binding by separating the valve disc from the inner and outer ring valve seats via a plate, steam is passed between the valve disc at high speed by providing a chamfered portion at the top corner of the annular plate. In the disc type steam trap, the upper surface area of the annular plate is reduced .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The air binding is eliminated by the bimetal ring moving up along the slope portion at a low temperature and lifting the valve disk through the annular plate to open the valve from the inner and outer ring valve seats. The bimetal ring expands at a high temperature and moves down the slope portion, and the annular plate also moves down along with the downward movement of the bimetal ring, so that the bimetal ring and the annular plate do not interfere with the valve disk. And this invention can make small the upper surface area of the cyclic | annular board which a vapor | steam passes between valve discs at high speed by providing the chamfering part in the corner | angular of the upper surface of a cyclic | annular board. Therefore, it becomes difficult for the annular plate to be sucked upward, and the bimetal ring is not easily hit by the valve disk via the annular plate.
[0007]
【Example】
An embodiment showing a specific example of the above technical means will be described (see FIG. 1).
An inlet 2 and an outlet 3 are formed on the same axis on the main body 1, and a variable pressure 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 variable pressure chamber 4 side, and an annular groove 8 is formed therebetween. The inlet 2 and the variable pressure chamber 4 communicate with each other via an inlet passage 9 formed in the inner ring valve seat 6, and the variable pressure chamber 4 and the outlet 3 communicate with each other via an outlet passage 10 formed from a part of the annular groove 8.
[0008]
A disc-shaped valve disk 11 that is attached to and detached from the inner and outer ring valve seats 6 and 7 is disposed in the variable pressure chamber 4. A conical inclined surface portion 12 is formed on the outer periphery of the outer ring valve seat 7, a bimetallic ring 13 with ends is disposed, and an annular plate 14 is disposed between the bimetallic ring 13 and the valve disk 11. An inner peripheral side chamfer 15 and an outer peripheral side chamfer 16 are formed at the corners of the upper surface of the annular plate 14. The chamfered portion can be provided on at least one of the inner peripheral side or the outer peripheral side.
[0009]
The operation of the above embodiment will be described.
When the trap body is at a low temperature, the bimetal ring 13 contracts and moves up the slope portion 12, lifts the valve disk 11 via the annular plate 14, and separates the valve disk 11 from the inner and outer ring valve seats 6 and 7. The valve is opened, and low-temperature condensate and air are discharged from the outlet passage 10 to the outlet 3. When the high-temperature condensate flows in, the bimetal ring 13 expands and moves down the inclined surface portion 12, and the annular plate 14 moves down along with the downward movement of the bimetal ring 13. 14 does not interfere with the operation of the valve disk 11.
[0010]
At this high temperature, the valve disk 12 is opened from the inner and outer ring valve seats 6 and 7 by the fluid pressure on the inlet 2 acting on the valve disk 11 via the inlet passage 9, and the high-temperature condensate is discharged from the outlet passage 10. To the outlet 3. When the high-temperature condensate is discharged and steam passes between the inner and outer ring valve seats 6 and 7 and the valve disk 11 at a high speed, the pressure between the inner and outer ring valve seats 6 and 7 and the valve disk 11 decreases, and the steam As a result, the pressure in the variable pressure chamber 4 increases and the valve disk 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 chamfered portions 15 and 16 provided at the corners of the upper surface of the annular plate 14 can reduce the upper surface area of the annular plate 14 through which steam passes between the valve disk 11 and the annular plate 14. 14 becomes difficult to be sucked upward, and the bimetal ring 13 is hardly hit against the valve disk 11 via the annular plate 14. When the steam in the variable pressure chamber 4 condenses due to heat dissipation or the like and the steam pressure decreases, the valve disk 11 opens from the inner and outer ring valve seats 6 and 7. Such an on-off valve cycle is repeated.
[0011]
【The invention's effect】
As described above, the present invention can reduce the upper surface area of the annular plate through which steam passes at high speed between the valve disk by providing the chamfered portion at the corner of the upper surface of the annular plate. Therefore, it becomes difficult for the annular plate to be sucked upward, and the bimetal ring is not easily hit by the valve disk via the annular plate. Therefore, it is possible to provide a disc type steam trap that can reduce wear and breakage of the bimetal ring and can maintain a good air binding elimination function for a long period of time.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of a disc type steam trap of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body 2 Inlet 3 Outlet 4 Transformer chamber 5 Lid member 6 Inner ring valve seat 7 Outer ring valve seat 8 Annular groove 9 Inlet path 10 Outlet path 11 Valve disk 12 Slope part 13 Bimetal ring 14 Annular plate 15 Inner side chamfer 16 Take part

Claims (1)

A valve disk is arranged in a variable pressure chamber formed by the inner and outer ring valve seats and the lid member, and a bimetal ring with ends is arranged on a conical slope formed on the outer periphery of the outer ring valve seat. An annular plate is placed between them, and the air disk is eliminated by separating the valve disc from the inner and outer ring valve seats via the annular plate at low temperatures in cooperation with the slope and the expansion / contraction action of the bimetal ring due to temperature change. In the disc type steam trap, a chamfered portion is provided at the corner of the upper surface of the annular plate to reduce the upper surface area of the annular plate through which steam passes between the valve disc and the valve disc at high speed .

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