JPH06265096A - Disk type steam trap - Google Patents

Abstract

PURPOSE:To obtain a disk type steam trap of simple structure which has function of eliminating air-binding and not closing a valve with condensation flow. CONSTITUTION:A valve disk 9 is disposed in a transformation chamber 4 formed with inner and outer annular valve seats 6, 7 and their lid member 5, a resistance groove 15 having an annular inclined portion 14 is formed at a position opposite to an annular groove 8 between the inner and the outer annular valve seats 6, 7 on the lower surface of the valve disk 9. A discontinuous bimetal ring 16 is disposed in the annular groove 8. At low temperature, the bimetal ring 16 is contraction closed, so that the inclined portion of the valve disk 9 is raised, and thus air-binding is eliminated. And then, due to the resistance groove 15 having the inclined portion 14, flow resistance becomes larger so the valve is not closed with condensation flow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc type steam trap for automatically discharging condensed water generated in a steam piping system. In this type of trap, a valve disc, which is seated on and off a valve seat surface consisting of inner and outer ring valve seats, is controlled by the pressure change of a variable pressure chamber formed behind the valve disc to open and close the valve.

In this disk type steam trap, even if air is introduced at the time of starting, it is instantly closed like steam, and once closed, air does not cause a condensation action unlike steam. After that, so-called air binding occurs, in which the valve cannot be opened. Further, it is necessary to design the flow resistance of the fluid passing between the valve disc and the valve seat so that the valve disc does not close by the passage of the condensate but closes by the passage of the steam.

[0003]

2. Description of the Related Art The elimination of air binding can be performed by using a bimetal. One such example is Shokoku Sho-8
No. 808 publication. This arranges the valve disc in the variable pressure chamber formed by the inner and outer ring valve seats and the lid member,
A conical slope portion is formed in the annular groove between the inner and outer ring valve seats, and an end bimetal ring is arranged in the annular groove to cooperate with the slope portion and the expansion / contraction action of the bimetal ring due to temperature change. Air binding is solved by. That is,
The bimetal ring moves up along the slope when the temperature is low, lifts the valve disc and opens / closes the valve seat from the inner and outer ring seats.
At high temperature, it moves downward along the slope and does not interfere with the valve disc. Although not disclosed in the above-mentioned publication, an annular resistance groove is conventionally formed on the lower surface of the valve disc so that the valve disc does not close when condensate passes and is closed by passage of steam. Is being increased.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In order to eliminate the air binding, it is necessary to provide a sloped part in the annular groove, and to increase the flow resistance,
It is necessary to provide a resistance groove in the valve disc. This complicates the structure and raises the manufacturing cost. Therefore, the technical problem of the present invention is to eliminate the air binding and obtain the function of not closing the valve by the condensate flow with a simple structure.

[0005]

The technical means of the present invention taken to solve the above technical problems is to dispose a valve disc in a variable pressure chamber formed by an inner and outer ring valve seat and a lid member, and A resistance groove having an annular slant surface is formed on the lower surface of the valve disc facing the annular groove between the valve seats, and an end bimetal ring is arranged in the annular groove. It is characterized in that the valve disc is separated from the inner and outer ring valve seats at low temperature in cooperation with the expansion, contraction and closing action to eliminate the air binding.

[0006]

The operation of the above technical means is as follows.
The flow resistance is increased by the resistance groove having the sloped portion on the lower surface of the valve disk, and the valve disk is not closed by the passage of the condensate but closed by the passage of the steam. Further, the air binding is eliminated by the cooperation of the sloped portion provided in the resistance groove and the expansion / contraction closing action of the bimetal ring due to the temperature change. Therefore, the resistance groove can also serve as the slope portion, so that the structure is simplified.

[0007]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIGS. 1 and 2). Entrance 2 on the same axis as the main body 1
And the outlet 3 are formed, and the variable pressure chamber 4 communicating with the inlet 2 and the outlet 3 is formed by the lid member 5 and the main body 1. An inner ring valve seat 6 and an outer ring valve seat 7 are concentrically formed in the same plane at the opening ends of the inlet 2 and the outlet 3 on the variable pressure chamber 4 side, and an annular groove 8 is formed therebetween. A disk-shaped valve disc 9 which is seated on and off the inner and outer ring valve seats 6 and 7 is arranged in the variable pressure chamber 4. The inlet 2 and the variable pressure chamber 4 communicate with each other through the inlet passage 10 formed in the inner ring valve seat 6, and the variable pressure chamber 4
And the outlet 3 communicate with each other via an outlet passage 11 formed from a part of the annular groove 8. A cap 12 is covered on the outside of the lid member 4 to form an air-holding greenhouse 13.

An annular resistance groove 15 having a conical slope portion 14 is formed at a portion of the lower surface of the valve disk 9 facing the annular groove 8. An end bimetal ring 16 is arranged in the annular groove 8. The bimetal ring 16 contracts at low temperatures and expands at high temperatures. The width of the bimetal ring 16 is larger than the depth of the annular groove and smaller than the sum of the depth of the annular groove 8 and the depth of the resistance groove 15.

The operation of the above embodiment will be described. When the temperature of the trap body is low, the bimetal ring 16 contracts and closes as shown in FIG. 1, lifts the slope 14 of the valve disc 9 to open and close the valve, and discharges low-temperature condensate and air. When hot condensate flows in, the bimetal ring 16 expands and the slope 14
Get out of. Then, the vapor passes through the lower surface of the valve disc 9, whereby the seated valve is closed as shown in FIG. Based on the operation principle of the well-known disc steam trap, steam is not released and only condensate is automatically discharged.

[0010]

As described above, according to the present invention, by providing the valve disc with the resistance groove having the inclined surface portion, the function of increasing the air resistance and the flow resistance can be provided with a simple structure and at a low cost. You can make a disc type steam trap.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an operating state at a low temperature of an embodiment of a disk type steam trap of the present invention.

FIG. 2 is a sectional view of only a main part showing an operating state at a high temperature of the embodiment of the disk type steam trap of the present invention.

[Explanation of reference symbols] 1 main body 2 inlet 3 outlet 4 variable pressure chamber 5 lid member 6 inner ring valve seat 7 outer ring valve seat 9 valve disc 14 beveled surface 15 resistance groove 16 bimetal ring

Claims (1)

[Claims] 1. A resistance groove having a valve disc disposed in a variable pressure chamber formed by inner and outer ring valve seats and a lid member, and having an annular slope portion on the lower surface of the valve disc facing the annular groove between the inner and outer ring valve seats. By arranging an ended bimetal ring in the annular groove, the valve disc is separated from the inner and outer ring valve seats at low temperature by the cooperation of the sloped surface and the expansion / compression action of the bimetal ring due to temperature change. A disc-type steam trap characterized by eliminating air binding.