JP4467734B2 - Disc type steam trap - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk-type steam trap that automatically discharges condensate generated in a steam piping system, and more particularly to a device that can eliminate air binding using a bimetal.
[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, when air flows into the variable pressure chamber, the valve closes in the same manner as in the case of steam. Once the valve is closed, air does not cause a condensing action unlike steam. Happens. Therefore, conventionally, this air binding has been eliminated by using bimetal. That is, the deformation action due to the temperature change of the bimetal is used to forcibly open the valve disk at a low temperature so as not to interfere with the valve disk at a high temperature.
[0003]
[Prior art]
An example of this is shown in Japanese Utility Model Publication No. 3-25516. What is disclosed here arranges a valve disk in a variable pressure chamber formed by inner and outer ring valve seats and a lid member, forms a bimetal accommodating recess in an annular groove between the inner and outer ring valve seats, and is fixed to the bimetal accommodating recess A double helically wound bimetal and an annular operating member are arranged around the guide rod to be operated, the bimetal extends when the temperature is low, the valve disk is forcibly opened via the operating member, and the valve is contracted when the temperature is high. It is designed not to interfere with the disc.
[0004]
[Problems to be solved by the invention]
In the above-mentioned conventional one, the bimetal force that extends at low temperatures acts on one location near the outer periphery of the valve disc, so the valve disc is inclined half open, and a large amount of low-temperature air must be excluded as at the start. When it was necessary, there was a problem that it took time to eliminate air binding. Therefore, the technical problem of the present invention is to provide a disc type steam trap that can quickly release air binding by fully opening the valve disc when a large amount of air must be excluded.
[0005]
[Means for Solving the Problems]
The technical means of the present invention taken in order to solve the above technical problem is that a valve disk is arranged in a variable pressure chamber formed by the inner and outer ring valve seats and the lid member, and the annular groove between the inner and outer ring valve seats is arranged. A bimetal accommodating recess is formed and the bimetal is arranged, the bimetal is extended at a low temperature to forcibly open the valve disk, and contracted at a high temperature so as not to interfere with the valve disk. The disc type steam trap is characterized in that a plurality of bimetals are formed at intervals and bimetals are disposed in the respective bimetal housing recesses, and the bimetallic materials are formed at different expansion and contraction temperatures.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, a plurality of bimetal receiving recesses are formed at equal intervals in an annular groove between the inner and outer ring valve seats, and bimetals are arranged in the respective bimetal receiving recesses, and the expansion and contraction temperatures of the respective bimetals are made different. Therefore, as the temperature of the transformer room decreases, each bimetal stretches sequentially, forcing the valve disc to open. For this reason, when a large amount of low-temperature air must be removed, such as at the time of starting, the bimetallic stretching force acts uniformly at several locations near the outer periphery of the valve disc, causing the valve disc to be displaced parallel to the inner and outer ring valve seat surfaces. The air binding can be eliminated quickly.
[0007]
【Example】
An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 to 3). A valve seat housing recess 5 to which the main body 1 is attached with the inlet 2, the outlet 3, and the valve seat member 4 is formed. The inlet 2 and the outlet 3 are formed on substantially the same axis. The inlet 2 communicates with the center of the valve seat housing recess 5 through the screen 6, and the outlet 3 communicates with the periphery of the valve seat housing recess 5. The valve seat member 4 is disposed in the valve seat housing recess 5, and is fastened to the main body 1 with a lid member 7 screwed to the inner periphery of the valve seat housing recess 5. A variable pressure chamber 8 is formed between the valve seat member 4 and the lid member 7.
[0008]
An ejection hole 9 is provided through the center of the valve seat member 4 to communicate with the inlet 2, and an annular groove 10 is provided at the periphery to communicate with the outlet 3 through the discharge hole 11. The three discharge holes 11 are located on concentric circles and are formed at regular intervals. An annular inner ring valve seat 12 is formed between the ejection hole 9 and the annular groove 10, and an annular outer ring valve seat 13 is formed outside the annular groove 10. The inner ring valve seat 12 and the outer ring valve seat 13 are concentric and formed in the same plane. In the variable pressure chamber 8, a valve disk 14 that is simultaneously attached to and detached from the inner and outer ring valve seats 12 and 13 is disposed.
[0009]
Three bimetal accommodating recesses 16 are formed in the annular groove 10. The bimetal accommodating recesses 16 are located on concentric circles and are formed at equal intervals. Each bimetal housing recess 16 includes a guide rod 17, an operation member 18 that covers the guide rod 17 and covers the tip of the guide rod 17, and a bimetal 19 disposed around the guide rod 17 and the operation member 18. The bimetal unit 20 is accommodated. The three bimetals 19 are formed with different expansion / contraction temperatures. The number of bimetal accommodating recesses 16 is not limited to three, and two or more can be formed.
[0010]
The bimetal 19 is formed into a double spiral winding shape in which a long strip-shaped plate material is spirally wound and further spirally wound. The guide rod 17 has a substantially semi-disc shaped claw portion 21 and a large diameter portion 22, and one end of the bimetal 19 is wound between the claw portion 21 and the large diameter portion 22 and fixed. The operation member 18 has a guide rod receiving recess 23, covers the guide rod 17 to cover the tip portion of the guide rod 17, and has a substantially semi-disc shaped claw portion 24 and a large diameter portion 25. The end is wound and fixed between the claw portion 24 and the large diameter portion 25. Since the operation member 18 is covered with the guide rod 17 and covers the tip end portion of the guide rod 17, foreign matter can be prevented from entering between the guide rod 17 and the operation member 18. Since one end of the bimetal 19 is fixed to the guide rod 17 and the other end is fixed to the operation member 18, the operation member 18 is moved inward and outward when the bimetal 19 contracts at high temperatures even when it is installed upside down or horizontally. The operation member 18 can be prevented from being hit by the valve disk 14 without protruding beyond the surfaces of the ring valve seats 12 and 13. The guide rod 17 fixes the large-diameter portion 22 by a fixing member 27 and a press-fitting member 28 screwed into the lateral hole 26 of the valve seat member 4.
[00011]
An annular regulating member 29 is press-fitted into the bimetal housing recess 16. The restricting member 29 has an inner diameter smaller than the outer diameter of the large-diameter portion 25 of the operating member 18, and restricts the displacement of the operating member 18 in the direction of the valve disk 14 to prevent over-extension of the bimetal 19. . Further, the outer diameter of the claw portion 21 of the guide rod 17 is larger than the inner diameter of the guide rod receiving recess 23 of the operation member 18, and by restricting the displacement of the operation member 18 in a direction opposite to the valve disc, the bimetal 19 is controlled. Prevent over-contraction.
[0012]
The operation of the above embodiment will be described.
When the trap body is at a low temperature as at the start, the three bimetals 19 are extended to forcibly open the valve disk 14 via the operation member 18, and the low-temperature condensate and air are discharged from the annular groove 10. Discharge to outlet 3 through hole 11. At this time, the force of the bimetal 19 acts uniformly at three locations near the outer periphery of the valve disc 14, so that the valve disc 14 is displaced in parallel with the surfaces of the inner and outer ring valve seats 12 and 13 and is fully opened, thus quickly eliminating air binding. it can. When high-temperature condensate flows in, the bimetal 19 contracts sequentially and does not interfere with the valve disk 14. The valve disk 14 is opened by the fluid pressure on the inlet 2 side acting on the valve disk 14 via the ejection hole 9, and the high-temperature condensate is discharged from the annular groove 10 to the outlet 3 through the discharge hole 11. When the high-temperature condensate is discharged and the steam passes between the inner and outer ring valve seats 12 and 13 and the valve disk 14 at a high speed, the pressure between the inner and outer ring valve seats 12 and 13 and the valve disk 14 decreases, and the steam As the pressure enters the variable pressure chamber 8, the pressure in the variable pressure chamber 8 rises, and the valve disk 14 closes. When the steam in the variable pressure chamber 8 is condensed due to heat radiation or the like and the steam pressure decreases, the valve disk 14 opens. Further, when the air enters the variable pressure chamber 8, the valve disk 14 is closed. However, as the temperature in the variable pressure chamber 8 decreases, the bimetal 19 is sequentially extended to force the valve disk 14 via the operation member 18. Open the valve to eliminate air binding.
[0013]
【The invention's effect】
As described above, according to the present invention, a plurality of bimetal receiving recesses are formed at equal intervals in the annular groove between the inner and outer ring valve seats, and the bimetals are arranged in the respective bimetal receiving recesses. Since the bimetals are sequentially expanded according to the temperature drop of the variable pressure chamber and the valve disk is forcibly opened, a large amount of low-temperature air must be excluded as at the start. The extension force acts evenly at several locations near the outer periphery of the valve disc, and the valve disc is displaced in parallel with the inner and outer ring valve seat surfaces to fully open, so the air binding can be quickly eliminated. Demonstrate.
[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.
2 is an enlarged cross-sectional view of a valve seat member and a valve disc portion of FIG.
3 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body 2 Inlet 3 Outlet 4 Valve seat member 7 Cover member 8 Transformer chamber 9 Injection hole 10 Annular groove 11 Discharge hole 12 Inner ring valve seat 13 Outer ring valve seat 14 Valve disk 16 Bimetal accommodation recessed part 17 Guide rod 18 Operation member 19 Bimetal 20 Bimetal Unit 21 Claw portion 22 Large diameter portion 23 Guide rod receiving recess 24 Claw portion 25 Large diameter portion 29 Restriction member

Claims (1)

A valve disk is placed in the variable pressure chamber formed by the inner and outer ring valve seats and the lid member, a bimetal housing recess is formed in the annular groove between the inner and outer ring valve seats, and the bimetal is extended at low temperatures. Forcing the disk to open and shrinking at high temperatures so as not to interfere with the valve disk, a plurality of bimetal receiving recesses are formed at equal intervals, and bimetals are arranged in the respective bimetal receiving recesses. A disc-type steam trap, characterized in that it is formed with different bimetallic expansion and contraction temperatures.

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