JPH08285187A - Disk type steam trap - Google Patents

Abstract

PURPOSE: To provide a disk type steam trap which can be continuously fully opened at a stretch when a valve disk slightly separates from inner and outer ring valve seats. CONSTITUTION: A cover body 2 is fixed to a main body 1 having an inlet 4 and an outlet 5, and a voltage transforming chamber 3 is formed inside. A blowout hole 6 opening in the center of the voltage transforming chamber is arranged, and the inlet and the voltage transforming chamber are communicated with each other. An annular groove 8 opening on the outer periphery of the blowout hole is arranged, and an inner ring valve seat 9 is formed between the blowout hole and the annular groove, and an outer ring valve seat 10 on the same plane with the inner ring valve seat is formed on the outer periphery of the annular groove. A discharge hole 7 is arranged from the annular groove, and the voltage transforming chamber and the outlet are communicated with each other. disk-shaped valve disk 11 to be separated from and seated on a valve seat surface composed of the inner ring valve seat and the outer ring valve seat is arranged in the voltage transforming chamber. An auxiliary valve seating ring 12 to slidingly move on an inner peripheral wall of the annular groove is arranged in the annular groove. A wavy spring 13 as an elastic member is arranged to slightly project the upper end of the auxiliary valve seating ring more than the valve seat surface of the inner and outer ring valve seats when the valve disk is opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a valve disk that opens and closes in response to changes in pressure in a variable pressure 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 to the inside, and more particularly to a disc type steam trap that can be continuously and fully opened at a stretch when the valve disc is slightly separated from the inner and outer ring valve seats.

[0002]

2. Description of the Related Art The basic structure of a disk type steam trap is that a cover is fixed to a main body having an inlet and an outlet to form a variable pressure chamber inside, and an injection hole is formed at the center of the variable pressure chamber to form an inlet. An annular groove that communicates with the variable pressure chamber and opens to the outer periphery of the ejection hole, forms an inner ring valve seat between the ejection hole and the annular groove, and an outer ring valve seat on the outer periphery of the annular groove. A flat disk-shaped valve disc, which has a discharge hole, communicates with the outlet through the annular groove and the discharge hole to the outlet, and is seated on and off the valve seat surface consisting of the inner ring valve seat and the outer ring valve seat, is arranged in the variable pressure chamber. Is something
The valve disk automatically separates from and sits on the valve seat surface according to the pressure change in the variable pressure chamber, that is, the thermodynamic steam chamber, and automatically discharges the condensate.

[0003]

SUMMARY OF THE INVENTION In the conventional disc type steam trap described above, the valve disc separates from the inner and outer ring valve seats and opens when vapor in the variable pressure chamber condenses and causes a pressure drop. is there. When this valve disc is about to start the opening operation, the sealing force with the inner and outer ring valve seats weakens, so a small gap is created between the inner and outer ring valve seats and the fluid is discharged to the outlet. There was a problem. Therefore, it was not preferable because it was mistaken for a steam leak. When this valve disc slightly separates from the inner and outer ring valve seats, for example, if the pressure in the variable pressure chamber decreases instantaneously, the valve disc will reach the fully open state at once. Is high pressure, the fluid on the inlet side preferentially flows out to the outlet, and the pressure in the variable pressure chamber does not drop instantaneously.

SUMMARY OF THE INVENTION Therefore, a technical object of the present invention is to provide a disc type steam trap which can be continuously and fully opened at a time 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 problems is to form a transformer chamber by fixing a lid to a main body having an inlet and an outlet, An injection hole that opens in the center of the variable pressure chamber is provided to connect the inlet and the variable pressure chamber, an annular groove that opens to the outer periphery of the injection hole is provided, and an inner ring valve seat is formed between the ejection hole and the annular groove. An outer ring valve seat that is flush with the inner ring valve seat is formed around the outer circumference of the annular groove, and a discharge hole is provided from the annular groove to connect the variable pressure chamber and the outlet, and to the valve seat surface that consists of the inner ring valve seat and the outer ring valve seat. With a disk-shaped valve disc that is seated and detached in a variable pressure chamber, an auxiliary valve seat ring that slides on the inner peripheral wall of the annular groove is placed in the annular groove, and the auxiliary valve seat ring of the auxiliary valve seat ring is opened when the valve disc is opened. An elastic member is provided, the upper end of which is slightly projected from the valve seat surface of the inner and outer ring valve seats.

[0006]

The operation of the above technical means is as follows.
According to the present invention, the elastic member biases the auxiliary valve seat ring so that the upper end of the auxiliary valve seat ring is slightly projected from the valve seat surface of the inner and outer ring valve seats when the valve disc is opened. Therefore, even if the valve disc is slightly separated from the inner and outer ring valve seats, the auxiliary valve seat ring maintains the contact with the valve disc. Therefore, the fluid pressure on the inlet side acts as a valve opening force for the valve disc via the auxiliary valve seat ring having a diameter larger than that of the ejection hole. As a result, the valve disc can be continuously and fully opened at a stretch when it is slightly separated from the inner and outer ring valve seats.

[0007]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). The lid 2 is screwed to the main body 1 to form the transformer chamber 3 inside. The inlet 4 and the outlet 5 are formed in the main body 1 on substantially the same axis. The main body 1 is provided with an ejection hole 6 opening 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 on 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,
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 are formed on the same plane. The end of the annular groove 8 communicates with the outlet 5 via the discharge hole 7.

A disk-shaped valve disk 11 for seating on and off the valve seat surfaces on the upper surfaces of the inner ring valve seat 9 and the outer ring valve seat 10 to open and close is arranged in the variable pressure chamber 3 in a free state. An auxiliary valve seat ring 12 that slides on the inner peripheral wall of the annular groove 8 is arranged in the annular groove 8. The inner diameter of the auxiliary valve seat ring 12 is formed to be slightly larger than the inner diameter of the annular groove 8, and the fluid hardly leaks between them. A ring-shaped wave spring 13 as an elastic member is arranged between the bottom wall of the annular groove 8 and the lower surface of the auxiliary valve seat ring 12. Wave spring 1
The urging force of 3 causes the valve disc 11 to move the inner and outer ring valve seats 9,
When slightly separated from 10, the upper end of the auxiliary valve seat ring 12 projects slightly from the valve seat surfaces of the inner and outer ring valve seats 9 and 10 and maintains contact with the lower surface of the valve disc 11.

Next, the operation will be described. When steam does not stay in the variable pressure chamber 3, the valve disc 11 is discharged through the ejection hole 6.
Due to the fluid pressure on the inlet 4 side acting on the valve disc 11
Is separated from the inner and outer ring valve seats 9 and 10 to cool low temperature condensate into the annular groove 8
And discharge 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 inside the variable pressure chamber 3 rises, and at the same time, high-speed steam flows down the lower surface of the valve disk 11 to lower the static pressure. As a result, the valve disc 11 is seated on the auxiliary valve seat ring 12 and is seated on the inner and outer ring valve seats 9 and 10 against the biasing force of the wave spring 13 to close the valve.

When the vapor in the variable pressure chamber 3 is condensed due to heat radiation and the vapor pressure is reduced, the valve disc 11 is kept in contact with the auxiliary valve seat ring 12 as shown in FIG. The valve seats are slightly separated from the valve seats 9 and 10, and are continuously and fully opened by the fluid pressure on the inlet 4 side acting through the auxiliary valve seat ring 12. The on-off valve cycle as described above is repeated.

[0012]

As described above, according to the present invention, when the valve disc is slightly separated from the inner and outer ring valve seats, the valve disc can be continuously and fully opened at once, so that it is not mistaken as a steam leak. Further, since the valve disc is seated on the auxiliary valve seat ring and then seated on the inner and outer ring valve seats, the impact of the seating is cushioned by the elastic member, and the auxiliary valve seat ring, the inner and outer ring valve seats and the valve disc can be prevented from being damaged. it can.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a disk type steam trap of the present invention.

[Explanation of symbols]

 1 Main body 2 Lid body 3 Transformer chamber 4 Inlet 5 Outlet 6 Jet hole 7 Discharge hole 8 Annular groove 9 Inner ring valve seat 10 Outer ring valve seat 11 Valve disk 12 Auxiliary valve seat ring 13 Wave spring

Claims (1)

[Claims] 1. A cover body is fixed to a main body having an inlet and an outlet to form a variable pressure chamber inside, and an injection hole opening at the center of the variable pressure chamber is provided to communicate the inlet and the variable pressure chamber, and the outside of the injection hole. By providing an annular groove that opens to the periphery, 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 around the outer periphery of the annular groove and is discharged from the annular groove. A disc-shaped valve disc, which has a hole to communicate with the variable pressure chamber and the outlet and which is seated in and away from the valve seat surface consisting of the inner ring valve seat and the outer ring valve seat, is arranged in the variable pressure chamber. An auxiliary valve seat ring that slides on the inner peripheral wall of the auxiliary valve seat ring is provided, and an elastic member that allows the upper end of the auxiliary valve seat ring to slightly project from the valve seat surface of the inner and outer ring valve seats when the valve disc is opened is provided. Disk type steam trap.