JP4467766B2 - 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 is that a lid member is fixed to a main body having an inlet and an outlet to form a variable pressure chamber therein, and an injection hole opened at the center of the variable pressure chamber is provided to connect the variable pressure chamber to the inlet. An annular groove that opens to the outer periphery of the hole is provided, an inner ring valve seat is formed between the ejection hole and the annular groove, and an outer ring valve seat that is flush with the inner ring valve seat is formed on the outer periphery of the annular groove. A disk-shaped valve disk that opens and closes from the part of the groove to connect the pressure-transformation chamber and the outlet, and is attached to and detached from the valve seat surface consisting of the inner ring valve seat and the outer ring valve seat, is placed in the transformer chamber. A bimetal accommodating recess is formed in the annular groove between the wheel valve seats, and a double helically wound bimetal and an annular operating member are arranged around the guide rod fixed to the bimetal accommodating recess. The valve disc is forcibly opened via the operating member and contracts at high temperatures to It is that so as not to interfere with.
[0004]
[Problems to be solved by the invention]
The above-described conventional apparatus has a problem in that the structure is complicated because a bimetal housing recess for arranging the bimetal and the operation rod has to be provided. In addition, since the bimetallic force that expands at low temperatures acts on one location near the outer periphery of the valve disk, the valve disk is in a semi-open state in which the valve disk is inclined, and it takes time to eliminate air binding. In addition, there is a problem that foreign matter in the fluid adheres to and accumulates on the step formed at the connection portion between the annular groove and the discharge hole, the discharge hole is narrowed, and the discharge hole is closed. Therefore, a technical problem of the present invention is to provide a disc type steam trap that can quickly eliminate air binding with a simple structure and can prevent foreign matter from accumulating in a discharge hole.
[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 lid member is fixed to a main body having an inlet and an outlet to form a variable pressure chamber therein, and an ejection hole that opens at the center of the variable pressure chamber An annular groove that opens to the outer periphery of the ejection hole is provided, an inner ring valve seat is formed between the ejection hole and the annular groove, and an inner ring valve seat is formed around the outer circumference of the annular groove. A disc that forms an outer ring valve seat that is flush with the outer ring, provides a discharge hole from a part of the annular groove, communicates with the variable pressure chamber and the outlet, and is seated on and off the valve seat surface comprising the inner ring valve seat and the outer ring valve seat The above-described discharge hole is provided with a bimetal that is arranged in a variable pressure chamber, extends at a low temperature, forcibly opens the valve disk via an operating member, contracts at a high temperature and does not interfere with the valve disk A plurality of the above-mentioned bimetal and the operation member are formed in each discharge hole by forming a plurality of them at equal intervals. And location, it is in the disc type steam trap, characterized in having a cleaning unit for cleaning the connecting portions of the respective operating members and an annular groove discharge hole.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, since the bimetal and the operation member are arranged in the discharge hole, a separate bimetal housing recess is not required, and air binding can be eliminated with a simple structure. In addition, since a plurality of discharge holes are formed at equal intervals and bimetal and operation members are arranged in each discharge hole, the bimetal force that expands at low temperatures acts uniformly at several locations near the outer periphery of the valve disk. Since the valve disk can be displaced in parallel with the inner and outer ring valve seat surfaces and fully opened, air binding can be quickly eliminated. In addition, since each operation member is provided with a cleaning part for cleaning the connection part between the annular groove and the discharge hole, the connection part between the annular groove and the discharge hole is cleaned by the cleaning part of the operation member every time air binding is canceled. can do.
[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]
A bimetal unit comprising a guide rod 17 in each discharge hole 11, 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. 20 is accommodated. The number of discharge holes 11 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 large-diameter portion 22 has six protrusions 16 on the outer periphery, and forms a passage through which fluid passes between the protrusions 16.
[0011]
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. A metal brush 29 as a cleaning part is attached to the outer periphery of the large diameter part 25. The tip of the metal brush 29 has a length that makes contact with the inner periphery of the discharge hole 11, and when the operation member 18 is displaced up and down, the tip of the metal brush 29 removes foreign matter adhering to the connection portion between the annular groove 10 and the discharge hole 11. It is something that can be done. 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.
[0012]
The operation of the above embodiment will be described.
When the trap body is at a low temperature, the bimetal 19 extends to forcibly open the valve disk 14 via the operation member 18, and discharges low-temperature condensate and air from the annular groove 10 to the outlet 3 through the discharge 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 hot condensate flows in, the bimetal 19 contracts 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. The valve disk 14 closes when air flows into the variable pressure chamber 8, but when the temperature in the variable pressure chamber 8 decreases, the bimetal 19 expands to forcibly open the valve disk 14 via the operation member 18. , Eliminate air binding. The foreign matter adhering to the connection portion between the annular groove 10 and the discharge hole 11 is removed when the metal brush 29 attached to the large diameter portion 25 of the operation member 18 is displaced up and down by the expansion or contraction of the bimetal 19.
[0013]
【The invention's effect】
As described above, the present invention can eliminate air binding quickly with a simple structure by forming a plurality of discharge holes at equal intervals and arranging a bimetal and an operation member in each discharge hole. By providing a cleaning part for cleaning the connection part between the annular groove and the discharge hole in the member, an excellent effect that the connection part between the annular groove and the discharge hole can be cleaned by the cleaning part of the operation member every time the air binding is 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 Protrusion 17 Guide rod 18 Operation member 19 Bimetal 20 Bimetal unit 21 Claw part 22 Large diameter part 23 Guide rod receiving recess 24 Claw part 25 Large diameter part 29 Metal brush

Claims (1)

A lid member is fixed to a main body having an inlet and an outlet, a variable pressure chamber is formed inside, an injection hole that opens at the center of the variable pressure chamber is provided, the variable pressure chamber communicates with the inlet, and an annular shape that opens to the outer periphery of the injection hole A groove is provided to form an inner ring valve seat between the ejection hole and the annular groove, and an outer ring valve seat that is flush with the inner ring valve seat is formed around the outer periphery of the annular groove. A disk-shaped valve disk is installed in the variable pressure chamber that communicates with the outlet of the variable pressure chamber and the outlet, and is attached to and detached from the valve seat surface consisting of the inner ring valve seat and the outer ring valve seat. The valve disc is forcibly opened to provide a bimetal that shrinks at high temperatures and does not interfere with the valve disc, and a plurality of the discharge holes are formed at equal intervals. Arrange and clean the connecting part of the annular groove and discharge hole in each operation member Disc type steam trap, characterized in that a dividing portion.

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