JP2847155B2 - Disc type steam trap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

In this disk type steam trap, even if air flows in at the time of starting, the valve closes instantaneously as in the case of steam, and once the valve is closed, unlike the steam, the air does not cause a condensation action. After that, so-called air binding that cannot be opened occurs. In addition, it is necessary to design the flow resistance of the fluid passing between the valve disk and the valve seat so that the valve disk does not close when the condensate passes, but closes when the steam passes.

[0003]

2. Description of the Related Art Air binding can be eliminated by using a bimetal. An example is the Japanese Patent Publication No. 50-8
No. 808. This disposes a valve disc in a variable pressure chamber formed by an inner and outer ring valve seat and a lid member,
A conical slope is formed in the annular groove between the inner and outer ring valve seats, and a bimetal ring with an end is arranged in the annular groove, which cooperates with the expansion and contraction of the bimetal ring due to temperature changes. This eliminates air binding. That is,
The bimetal ring moves up along the slope at low temperatures, lifts the valve disc, and opens the valve from the inner and outer ring valve seats.
At high temperatures, it moves down along the slope and does not interfere with the valve disc. Although not described 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 the condensate passes but closes when the steam passes, so that the flow resistance is reduced. Has been made larger.

[0004]

In the above publication,
In order to eliminate air binding, it is necessary to provide a slope in the annular groove, and to increase the flow resistance,
It is necessary to provide a resistance groove in the valve disk. For this reason, there is a problem that the structure becomes complicated and the manufacturing cost increases. Therefore, a technical problem of the present invention is to obtain a function that eliminates air binding and does not close with a condensate flow with a simple structure.

[0005]

The technical means of the present invention taken to solve the above technical problem is to dispose a valve disk in a variable pressure chamber formed by inner and outer ring valve seats and a lid member, A resistance groove having an annular slope portion is formed on the lower surface of the valve disk facing the annular groove between the ring valve seats, and a bimetal ring having ends is arranged in the annular groove, and the bimetal ring due to the slope portion and the temperature change is formed. In cooperation with the expansion and contraction action, the valve disc is separated from the inner and outer ring valve seats at a low temperature to eliminate air binding.

[0006]

The operation of the above technical means is as follows.
The flow resistance is increased by the resistance groove having the slope portion on the lower surface of the valve disk, and the valve disk does not close when the condensate passes but closes when the steam passes. In addition, the air binding is eliminated by the cooperation of the slope portion provided in the resistance groove and the expansion and contraction of the bimetal ring by the temperature change. Therefore, the structure can be simplified because the resistance groove and the slope can be used as both.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). Entrance 2 on the same axis as body 1
And an outlet 3, and a transforming 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 formed concentrically on the same plane at the opening ends of the inlet 2 and the outlet 3 on the side of the transformer chamber 4, and an annular groove 8 is formed therebetween. Disc-shaped valve discs 9 which are seated and demounted on the inner and outer ring valve seats 6 and 7 are arranged in the variable pressure chamber 4. The inlet 2 communicates with the variable pressure chamber 4 through an inlet passage 10 formed in the inner ring valve seat 6.
And the outlet 3 communicate with each other through an outlet passage 11 formed from a part of the annular groove 8. The cap 12 is put on the outside of the lid member 4 to form the air-insulating chamber 13.

An annular resistance groove 15 having a conical slope 14 is formed on the lower surface of the valve disk 9 at a position facing the annular groove 8. An end bimetal ring 16 is arranged in the annular groove 8. The bimetallic 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 is 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 is contracted and closed as shown in FIG. 1, and the slope 14 of the valve disk 9 is lifted to open the valve to the unseated position to discharge low-temperature condensate and air. When the high-temperature condensate flows in, the bimetal ring 16 expands and the slope 14
Get off. Then, when the steam passes through the lower surface of the valve disk 9, the seat is closed and closed as shown in FIG. Thereafter, based on the well-known principle of operation of the disk type steam trap, steam is not released and only condensate is automatically discharged.

[0010]

As described above, according to the present invention, by providing a resistance groove having an inclined surface portion in a valve disk, a function of eliminating air binding and increasing flow resistance with a simple structure and at low cost is provided. Disc type steam trap can be made.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an operation 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 symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Inlet 3 Outlet 4 Transformation chamber 5 Lid member 6 Inner ring valve seat 7 Outer ring valve seat 9 Valve disk 14 Slope section 15 Resistance groove 16 Bimetal ring

Claims (1)

(57) [Claims] 1. A resistance groove having a valve disk disposed in a variable pressure chamber formed by an inner and outer ring valve seat and a lid member, and having an annular slope portion on a lower surface of the valve disk facing an annular groove between the inner and outer ring valve seats. A bimetallic ring with ends is arranged in the annular groove, and the valve disc is separated from the inner and outer ring valve seats at low temperatures by cooperation of the slope and the expansion and contraction of the bimetallic ring due to temperature change. A disc-type steam trap characterized by eliminating air binding.