JP2002147692A - Disc-type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc-type steam trap capable of continuously fully opening at one stroke without discharging a fluid when a valve disc is separated slightly from an inner and outer ring valve seat. SOLUTION: A lid 2 is secured to a main body 1 having an inlet 4 and an outlet 5 to form a transformation chamber 3 in the interior thereof. A nozzle 6 opened in the center of the transformation chamber 3 is provided to communicate the inlet with the transformation chamber. An annular groove 8 opened in the outer periphery of the nozzle is provided, an inner ring valve seat 9 is formed between the nozzle and the annular groove, and an outer ring valve seat 10 having the same plane with the inner ring valve seat is formed in the outer periphery of the annular groove. A discharge hole 7 from the annular groove is provided to communicate the transformation chamber with the outlet. A disc-like valve disc 11 separating and seated from and to the valve seat surface formed by the inner ring valve seat and the outer ring valve seat is disposed in the transformation chamber. An auxiliary inner ring valve seat ring 12 sliding on the inner peripheral wall of the annular groove is disposed in the annular groove. A waveform spring 13 is provided as an elastic member for projecting the upper end of the auxiliary inner ring valve seat ring slightly over the valve seat surface of the inner and outer ring valve seat when the valve disc opens the valve. An auxiliary outer ring valve seat ring 14 sliding on the outer peripheral wall of the outer ring valve seat is disposed in the outer periphery of the outer ring valve seat. A waveform spring 14 is provided as an elastic member for projecting the upper end of the auxiliary outer ring valve seat ring slightly over the valve seat surface of the inner and outer ring valve seat when the valve disc closes the valve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a valve disc which opens and closes in response to a pressure change in a transformer chamber, that is, a thermodynamic steam chamber, to automatically condense water generated in various steam-using devices and steam pipes. The present invention relates to a disc-type steam trap that discharges air to a valve, and more particularly to a valve that can continuously and fully open the valve disc when the valve disc is slightly separated from the inner and outer ring valve seats.

The basic structure of a disc-type steam trap is as follows: a lid is fixed to a main body having an inlet and an outlet to form a variable pressure chamber inside, and an ejection hole opened at the center of the variable pressure chamber is provided; And an annular groove opening around the outer periphery of the ejection hole is provided, an inner ring valve seat is formed between the ejection hole and the annular groove, an outer ring valve seat is formed around the outer periphery of the annular groove, and a discharge hole is formed from the annular groove. A flat disk-shaped valve disk that is provided and communicates with the outlet through the annular groove and the discharge hole to the outlet through the annular groove and the discharge hole, and is disposed in the variable pressure chamber so as to be separated from and seated on the valve seat surface including the inner ring valve seat and the outer ring valve seat, When the steam in the variable pressure chamber is condensed and the pressure drops, the valve disc is separated from the inner and outer ring valve seats and opens.
In this disk type steam trap, when the valve disk is about to start the valve opening operation, the sealing force with the inner and outer ring valve seats is weakened, so that a slight gap is formed between the inner and outer ring valve seats, and the fluid is discharged from the outlet. It was exhausted randomly, and was mistaken for a steam leak.

[0003]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. Hei 8-285187 discloses a disc-type steam trap which can be continuously opened at a stroke when the valve disc is slightly separated from the inner and outer ring valve seats. This means that an auxiliary inner ring valve seat ring which slides on the inner peripheral wall of the annular groove is arranged in the annular groove, and the upper end of the auxiliary inner ring valve seat ring is slightly raised from the valve seat surface of the inner and outer ring valve seats when the valve disc is opened. The auxiliary inner ring valve seat ring keeps contact with the valve disk even if the valve disk is slightly away from the inner and outer ring valve seats, and the auxiliary inner ring valve has a larger diameter than the ejection hole even if the valve disk is slightly separated from the inner and outer ring valve seats. By causing the fluid pressure on the inlet side to act as a valve-opening force on the valve disc via the seat ring, the valve disc can be fully and continuously opened at a stretch when the valve disc is slightly separated from the inner and outer ring valve seats.

[0004]

In the above-mentioned conventional disk type steam trap, when the valve disk is slightly separated from the inner and outer ring valve seats, it can be continuously and fully opened at a stretch. When you are slightly away from
Due to the small gap between the valve disc and the outer ring valve seat, the fluid in the transformer chamber was slightly discharged to the outlet, leaving room for improvement. Therefore, the technical problem of the present invention is:
An object of the present invention is to provide a disc-type steam trap which can be continuously opened at a stroke without discharging fluid when the valve disc is slightly separated from the inner and outer ring valve seats.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is to fix a lid to a main body having an inlet and an outlet to form a variable pressure chamber therein, An ejection hole that opens at the center of the transformation chamber is provided to communicate the inlet and the transformation chamber, and an annular groove that opens around the periphery of the ejection hole is provided, and an inner ring valve seat is formed between the ejection hole and the annular groove, An outer ring valve seat on the same plane as the inner ring valve seat is formed around the outer circumference of the annular groove, a discharge hole is provided from the annular groove to communicate the variable pressure chamber and the outlet, and for the valve seat surface consisting of the inner ring valve seat and the outer ring valve seat A disc-shaped valve disc is provided in the variable pressure chamber, and an auxiliary inner ring valve seat ring that slides on the inner peripheral wall of the annular groove is disposed in the annular groove. An elastic member that makes the upper end protrude slightly from the valve seat surface of the inner and outer ring valve seats is provided around the outer ring valve seat. An elastic member is provided that arranges an auxiliary outer ring valve seat ring that slides on the outer peripheral wall of the ring valve seat, and makes the upper end of the auxiliary outer ring valve seat ring slightly project from the valve seat surface of the inner and outer ring valve seats when the valve disc is opened. It is provided.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, when the valve disc is opened, the upper end of the auxiliary inner ring valve seat ring and the upper end of the auxiliary outer ring valve seat ring project slightly from the valve seat surface of the inner and outer ring valve seats. is there.
Therefore, when the valve disk is slightly separated from the inner and outer ring valve seats, the auxiliary inner ring valve seat ring and the auxiliary outer ring valve seat ring maintain contact with the valve disk and do not discharge fluid. Then, the valve disc is fully opened at a stretch by the fluid pressure on the inlet side acting via the auxiliary inner ring valve seat ring having a diameter larger than that of the ejection hole. Thereby, when the valve disc is slightly separated from the inner and outer ring valve seats,
It can be fully opened continuously at a stroke without discharging the fluid.

[0007]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). A transformer 2 is formed by screwing a lid 2 to the main body 1. An inlet 4 and an outlet 5 are formed on the main body 1 on substantially the same axis. An ejection hole 6 opening at the center of the transformation chamber 3 is opened in the main body 1, and the inlet 4 and the transformation chamber 3 communicate with each other through the ejection hole 6. An annular groove 8 is provided around the outside of the ejection hole 6,
An annular inner ring valve seat 9 is formed between the ejection hole 6 and the annular groove 8,
An annular outer ring valve seat 10 is formed around the outer periphery of the annular groove 8. The inner ring valve seat 9 and the outer ring valve seat 10 are concentric and formed on the same plane. The end of the annular groove 8 communicates with the outlet 5 through the discharge hole 7. A disc-shaped valve disk 11 that is detachably seated on the upper and lower valve seat surfaces of the inner ring valve seat 9 and the outer ring valve seat 10 to open and close the valve is disposed in the variable pressure chamber 3 in a free state.

An auxiliary inner ring valve seat ring 12 that slides on the inner peripheral wall of the annular groove 8 is disposed in the annular groove 8. The inner diameter of the auxiliary inner ring valve seat ring 12 is formed to be slightly larger than the inner diameter of the annular groove 8, and fluid hardly leaks from between them. A ring-shaped wave spring 13 as an elastic member is disposed between the bottom wall of the annular groove 8 and the lower surface of the auxiliary inner ring valve seat ring 12. When the valve disc 11 is slightly separated from the inner and outer ring valve seats 9 and 10 by the urging force of the wave spring 13, the upper end of the auxiliary inner ring valve seat ring 12 is slightly smaller than the valve seat surfaces of the inner and outer ring valve seats 9 and 10. To maintain contact with the lower surface of the valve disc 11.

An auxiliary outer ring valve seat ring 14 that slides on the outer peripheral wall of the outer ring valve seat 10 is disposed around the outer ring valve seat 10. The inner diameter of the auxiliary outer ring valve seat ring 14 is formed to be slightly larger than the outer diameter of the outer ring valve seat 10, and fluid hardly leaks from between them. A ring-shaped wave spring 15 as an elastic member is disposed between the upper wall of the main body 1 outside the outer ring valve seat 10 and the lower surface of the auxiliary outer ring valve seat ring 14. When the valve disc 11 is slightly separated from the inner and outer ring valve seats 9 and 10 by the urging force of the wave spring 15, the upper end of the auxiliary outer ring valve seat ring 14 is slightly lower than the valve seat surfaces of the inner and outer ring valve seats 9 and 10. To the valve disk 11
Maintain contact with the lower surface.

Next, the operation will be described. When no steam is retained in the variable pressure chamber 3, the valve disc 11
The fluid pressure at the inlet 4 acting on the valve disc 11
Is separated from the inner and outer ring valve seats 9 and 10 to condense low-temperature condensate
To the outlet 5 through the discharge hole 7.

When the condensate is discharged and steam flows into the variable pressure chamber 3, the pressure in the variable pressure chamber 3 increases, and high-speed steam flows down the lower surface of the valve disk 11 to decrease the static pressure. As a result, the valve disc 11 is
And the auxiliary outer ring valve seat ring 14 and seats on the inner and outer ring valve seats 9 and 10 against the urging force of the wave springs 13 and 15 to close the valve.

When the steam in the variable pressure chamber 3 is condensed by heat radiation or the like and the steam pressure decreases, the valve disk 11 is moved to the auxiliary inner ring valve seat ring 12 and the auxiliary outer ring valve seat ring 14 as shown in FIG.
The inlet 4 is slightly separated from the inner and outer ring valve seats 9 and 10 while maintaining contact with the inner ring 4 and acts via the auxiliary inner ring valve seat ring 12.
Fully open continuously at a stretch by the fluid pressure on the side. The above-described on-off valve cycle is repeated.

[0013]

As described above, according to the present invention, when the valve disk is slightly separated from the inner and outer ring valve seats, the valve can be continuously and fully opened without discharging the fluid. Disappears. Also, since the valve disk is seated on the inner and outer ring valve seats after being seated on the auxiliary inner ring valve seat ring and the auxiliary outer ring valve seat ring, the impact of seating is reduced by the elastic member, and the auxiliary inner ring valve seat ring, the auxiliary outer ring valve seat ring and Damage to the inner and outer ring valve seats and valve discs can be prevented.

[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.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Transformer chamber 4 Inlet 5 Outlet 6 Outlet 7 Outlet 8 Annular groove 9 Inner ring valve seat 10 Outer ring valve seat 11 Valve disk 12 Auxiliary inner ring valve seat ring 13 Wave spring 14 Auxiliary outer ring valve seat ring 15 Wave spring

Claims (1)

[Claims] 1. A variable pressure chamber is formed by fixing a lid to a main body having an inlet and an outlet, and a discharge hole is provided at the center of the variable pressure chamber to communicate the inlet with the variable pressure chamber. An annular groove that opens to the periphery 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 and discharged from the annular groove. A hole is provided to communicate the variable pressure chamber with the outlet, and a disc-shaped valve disk that is separated from and seated on the valve seat surface composed of the inner ring valve seat and the outer ring valve seat is arranged in the variable pressure chamber. An auxiliary inner ring valve seat ring that slides on the peripheral wall is arranged, and an elastic member that makes the upper end of the auxiliary inner ring valve seat ring slightly project from the valve seat surface of the inner and outer ring valve seats when the valve disc is opened is provided. An auxiliary outer ring valve seat ring that slides on the outer peripheral wall of the outer ring valve seat is provided around the outer ring valve seat, and the auxiliary outer ring is opened when the valve disk is opened. A disc-type steam trap, wherein an elastic member is provided to make the upper end of the wheel valve seat ring slightly protrude from the valve seat surfaces of the inner and outer wheel valve seats.