JP4540860B2 - 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 various steam-using devices and steam pipes by using a valve disk that opens and closes in response to a pressure change in a variable pressure chamber, that is, a thermodynamic steam chamber. In particular, the present invention relates to a high temperature and high pressure steam system (generally 16 kg / cm 2 in a steam trap, 220 ° C. or more).
[0002]
The basic configuration of the disc type steam trap is that a lid is fixed to a main body having an inlet and an outlet to form a variable pressure chamber inside, and an outlet hole is formed in the center of the variable pressure chamber so that the inlet and the variable pressure chamber communicate with each other. 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 outer ring valve seat that is flush with the inner ring valve seat is formed on the outer periphery of the annular groove. , A discharge hole is provided in the annular groove, the transformation chamber communicates with the outlet, and a disk-shaped valve disk that is attached to and detached from the inner ring valve seat and the outer ring valve seat is disposed in the transformation chamber. It is controlled in a self-powered manner by pressure change and is seated on the inner ring valve seat and the outer ring valve seat, and the condensate is automatically discharged. When this disk-type steam trap is used in a high-temperature and high-pressure steam system, there is a problem that a slight gap is formed between the valve disk and the inner ring valve seat, and the steam leaks. This is because when the valve is closed, a high-temperature and high-pressure inlet-side pressure acts at the center of the bottom surface of the valve disk, and the pressure of the variable pressure chamber acts on the top surface of the valve disk, so that the valve disk curves upwardly, This is because a slight gap is formed between the outer ring valve seat and the inner ring valve seat.
[0003]
[Prior art]
Therefore, conventionally, a technique as disclosed in Japanese Patent Publication No. 48-15342 has been used. This is because the central part of the lower surface of the valve disk is formed so as to protrude slightly below the outer peripheral part, so that even when the valve disk curves upwardly when the valve is closed, the valve disk is It can be in close contact with the valve seat.
[0004]
[Problems to be solved by the invention]
In the conventional disc type steam trap, the valve disc can be kept in close contact with the inner ring valve seat and the outer ring valve seat immediately after the valve is closed, but the pressure between the outer ring valve seat and the valve disc is reduced as the pressure in the variable pressure chamber decreases. Since a slight gap is generated, there is a problem that the fluid in the variable pressure chamber is discharged to the outlet and the valve is opened relatively early. This is because the degree of curvature of the valve disk decreases as the pressure in the variable pressure chamber decreases, and the valve disk is in close contact with the inner ring valve seat, but a slight gap is formed between the valve disk and the outer ring valve seat. . Therefore, the technical problem of the present invention is to provide a disc type steam trap which does not discharge the fluid in the variable pressure chamber until the valve disc is separated from the inner ring valve seat.
[0005]
[Means for Solving the Problems]
The technical means of the present invention devised to solve the above technical problem is that a lid 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 to communicate the inlet and the variable pressure chamber, and an inner ring valve seat is formed between the ejection hole and the annular groove. The outer ring valve seat is formed in the same plane as the outer ring, a discharge hole is provided through the annular groove, the variable pressure chamber communicates with the outlet, and a disc-shaped valve disk that is attached to and detached from the inner ring valve seat and the outer ring valve seat is disposed in the variable pressure chamber. In this case, the central part of the lower surface of the valve disk is formed so as to protrude slightly below the outer peripheral part, a seal ring that slides on the outer peripheral wall of the outer ring valve seat is arranged around the outer ring valve seat, an elastic member which slightly protrude than the upper end of the seal ring inner valve seat and the outer ring valve seat when the valve is opened The spring of Te, in which provided between the lower surface of the bottom wall and the sealing ring of the outer periphery of the outer ring valve seat.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, the center portion of the lower surface of the valve disk is formed so as to protrude slightly below the outer peripheral portion, and a seal ring that slides on the outer peripheral wall of the outer ring valve seat is disposed around the outer ring valve seat. A spring as an elastic member that slightly protrudes the upper end of the seal ring from the inner ring valve seat and the outer ring valve seat when the valve is opened is provided between the bottom wall around the outer ring valve seat and the lower surface of the seal ring It is. Therefore, immediately after the valve is closed, the valve disk is in close contact with the inner ring valve seat, the outer ring valve seat, and the seal ring against the biasing force of the spring as an elastic member. When the degree of curve of the valve disc by pressure drop of the transformer chamber is reduced, but results in a slight gap between the valve disc and the outer ring valve seat, the seal ring to contact the valve disc by the urging force of the spring as the elastic member Maintain and do not drain the fluid in the transformer room. Then, after the pressure in the variable pressure chamber is reduced to a predetermined valve opening pressure, the valve disc is separated from the inner ring valve seat and the seal ring and opened.
[0007]
【Example】
An embodiment showing a specific example of the above technical means will be described (see FIG. 1).
A lid 2 is screwed to the main body 1 to form a variable pressure chamber 3 therein. An inlet 4 and an outlet 5 are formed on the main body 1 on substantially the same axis. The main body 1 is provided with an ejection hole 6 that opens at the center of the variable pressure chamber 3, and the inlet 4 and the variable pressure chamber 3 are communicated with each other through the ejection hole 6. An annular groove 8 is provided around the outer periphery of the ejection hole 6, an annular inner ring valve seat 9 is formed between the ejection hole 6 and the annular groove 8, and the inner ring valve seat 9 is concentrically identical to the outer periphery of the annular groove 8. A planar annular outer ring valve seat 10 is formed. The end of the annular groove 8 communicates with the outlet 5 through the discharge hole 7. A disc-shaped valve disk 11 that opens and closes to the inner ring valve seat 9 and the outer ring valve seat 10 to open and close is disposed in the variable pressure chamber 3 in a free state. The valve disk 11 is formed by slightly projecting the center part of the lower surface thereof below the outer peripheral part.
[0008]
A seal ring 12 that slides on the outer peripheral wall of the outer ring valve seat 10 is disposed on the outer periphery of the outer ring valve seat 10, and the valve disk 11 is disposed between the outer peripheral bottom wall of the outer ring valve seat 10 and the lower surface of the seal ring 12. A ring-shaped wave spring 13 is disposed as an elastic member that slightly protrudes the upper end of the seal ring 12 from the inner ring valve seat 9 and the outer ring valve seat 10 when the valve is opened. When the degree of curvature of the valve disk 11 is reduced due to a pressure drop in the variable pressure chamber and a slight gap is generated between the valve disk 11 and the outer ring valve seat 10, the seal ring 12 is The close contact with the disk 11 is maintained.
[0009]
Next, the operation will be described. When steam does not stay in the variable pressure chamber 3, the valve disk 11 is separated from the inner and outer ring valve seats 9 and 10 due to the fluid pressure on the inlet 4 side acting on the valve disk 11 through the ejection holes 6, and the temperature is low. Condensate is discharged to the outlet 5 through the annular groove 8 and the discharge hole 7.
[0010]
When the condensate is discharged and steam flows into the variable pressure chamber 3, the pressure in the variable pressure chamber 3 rises, and high-speed steam flows down the bottom surface of the valve disk 11 to reduce the static pressure. The valve disk 11 is seated on the inner ring valve seat 9, the outer ring valve seat 10 and the seal ring 12 against the urging force of the wave spring 13 and is closed.
[0011]
When the steam in the variable pressure chamber 3 condenses due to heat dissipation or the like and the steam pressure decreases, the degree of curvature of the valve disk 11 decreases, and a slight gap is formed between the valve disc 11 and the outer ring valve seat 10 as shown in FIG. However, the seal ring 12 maintains close contact with the valve disk 11 by the urging force of the wave spring 13 and does not discharge the fluid in the variable pressure chamber 3. Then, after the pressure in the variable pressure chamber 3 is lowered to a predetermined valve opening pressure, the valve disk 11 is separated from the inner ring valve seat 9 and the seal ring 12 and opened. The above open / close valve cycle is repeated.
[0012]
【The invention's effect】
As described above, according to the present invention, even if a slight gap is generated between the valve disk and the outer ring valve seat, the seal ring maintains close contact with the valve disk and does not discharge the fluid in the variable pressure chamber. It is possible to prevent the valve from opening. Therefore, an excellent effect is obtained that frequent open / close valves can be prevented and the life can be extended.
[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 Lid 3 Transformer chamber 4 Inlet 5 Outlet 6 Ejection hole 7 Ejection hole 8 Annular groove 9 Inner ring valve seat 10 Outer ring valve seat 11 Valve disk 12 Seal ring 13 Wave spring

Claims (1)

A lid is fixed to the main body having an inlet and an outlet to form a variable pressure chamber inside, and an injection hole that opens at the center of the variable pressure chamber is provided so that the inlet and the variable pressure chamber communicate with each other. 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. When the disk-shaped valve disk that communicates with the chamber and the outlet and is placed on the inner ring valve seat and the outer ring valve seat is arranged in the variable pressure chamber, the center of the bottom surface of the valve disk is slightly protruded below the outer periphery. The seal ring that slides on the outer periphery of the outer ring valve seat is arranged around the outer ring valve seat, and the upper end of the seal ring slightly protrudes from the inner ring valve seat and the outer ring valve seat when the valve disc is opened. a spring as an elastic member for, the lower surface of the bottom wall and the sealing ring of the outer periphery of the outer ring valve seat Disc type steam trap, characterized in that provided in the.

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