JP2013108530A - Disk type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resolve air binding by small operating force of a bimetal ring.SOLUTION: A valve disk 11 is arranged in a variable pressure chamber 4 which is formed of inner and outer ring valve seats 6, 7 and a lid member 5. A bimetal ring 13 having ends which performs expansion-opening/contraction-closing operation by temperature change is arranged in the outer periphery of the outer ring valve seat 7. One end of the bimetal ring 13 is fixed to the outer periphery wall of the outer ring valve seat 7 with a screw 14. A plurality of communicating holes 15 which communicate an annular groove 8 between the inner ring valve seat 6 and the outer ring valve seat 7 and the variable pressure chamber 4 are formed in the outer ring valve seat 7 from one end to the other end of the bimetal ring 13. By the expansion-opening and contraction-closing action of the bimetal ring 13 according to the temperature change, the plurality of communicating holes 15 are opened sequentially during low temperature from the other end side, and are closed sequentially during high temperature from the one end side, and thereby the air binding is resolved by the small operating force of the bimetal ring 13.

Description

The present invention relates to a disk-type steam trap that automatically discharges condensate generated in a steam piping system by opening and closing a valve disk in response to a pressure change in a variable pressure chamber, that is, a thermodynamic steam chamber, and in particular, bimetal. It relates to the one that can be used to eliminate air binding.

The disc-type steam trap automatically controls the condensate by opening and closing the valve disc that is separated from the valve seat surface consisting of the inner and outer ring valve seats by the pressure change in the variable pressure chamber formed behind the valve disc. Are exhausted. In this case, even if air flows in at the time of starting, it closes instantaneously as in the case of steam, and once closed, air does not cause a condensing action unlike steam, so it cannot be opened thereafter. So-called air binding occurs. Therefore, conventionally, this air binding has been eliminated by using bimetal. An example of this is shown in Patent Document 1. This is because a bimetal ring with ends is arranged on a conical slope formed on the outer periphery of the outer ring valve seat, and the valve disk is operated at low temperatures by cooperation between the slope and the bimetal ring's expansion / contraction action due to temperature change. The valve is lifted and opened so that it does not interfere with the valve disk at high temperatures.

Japanese Patent Publication No. 50-8809

The above conventional disc type steam trap cannot be lifted unless the bimetal ring exerts a large operating force. Therefore, the bimetal ring is easily worn, and air binding cannot be eliminated relatively early. is there.

Therefore, the problem to be solved by the present invention is to enable air binding to be eliminated with a small operating force of the bimetal ring.

In order to solve the above-mentioned problems, the disc type steam trap of the present invention has a valve disc arranged in a variable pressure chamber formed by inner and outer ring valve seats and a lid member, and expands and contracts due to temperature change on the outer circumference of the outer ring valve seat. In the arrangement of a closed bimetal ring that performs the closing action, one end of the bimetal ring is fixed to the outer peripheral wall of the outer ring valve seat, and the annular groove between the inner ring valve seat and the outer ring valve seat communicates with the variable pressure chamber. A plurality of holes are formed in the outer ring valve seat from one end to the other end of the bimetal ring, and multiple communication holes are opened sequentially at low temperatures and sequentially closed at high temperatures by the expansion and contraction action of the bimetal ring due to temperature changes. It is what.

According to the present invention, one end of the bimetal ring is fixed to the outer peripheral wall of the outer ring valve seat, and the communication hole that connects the annular groove between the inner ring valve seat and the outer ring valve seat and the variable pressure chamber is formed in the outer ring valve seat. A plurality of holes are formed from one end side to the other end side, and a plurality of communication holes are sequentially opened at a low temperature by the expansion and contraction action of the bimetal ring due to a temperature change. The bimetal ring can be opened and closed sequentially with a small deformation force, since the multiple holes are opened sequentially from the other end of the bimetal ring and closed sequentially from one end. The air binding can be eliminated with a small operating force.

It is sectional drawing of the disk type steam trap concerning embodiment of this invention. It is AA sectional drawing of the main body 1 of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. An inlet 2 and an outlet 3 are formed on the same axis on the main body 1, and a 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 formed concentrically and 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 disc-shaped valve disk 11 that is attached to and detached from the inner and outer ring valve seats 6 and 7 is disposed in the variable pressure chamber 4. The inlet 2 and the variable pressure chamber 4 communicate with each other via an inlet passage 9 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 10 formed from a part of the annular groove 8.

An ended bimetal ring 13 that expands and contracts by temperature change is disposed on the outer periphery of the outer ring valve seat 7. One end of the bimetal ring 13 is fixed to the outer peripheral wall of the outer ring valve seat 7 with screws 14. A communication hole 15 for communicating the annular groove 8 and the variable pressure chamber 4 is formed in the outer ring valve seat 7. A plurality of communication holes 15 are formed from one end side to the other end side of the bimetal ring 13. Due to the expansion / contraction action of the bimetal ring 13 due to temperature change, the plurality of communication holes 15 are sequentially opened from the other end side of the bimetal ring 13 at a low temperature and are sequentially closed from one end side at a high temperature. Can eliminate air binding.

The operation of the above embodiment will be described. When the trap body is cold, the bimetal ring 13 expands to open a plurality of communication holes 13 to prevent air binding. The valve disk 11 is opened from the inner and outer ring valve seats 6 and 7 to discharge low-temperature condensate and air.

If the high-temperature condensate flows, the bimetal ring 13 is closed and the plurality of communication holes 13 are closed. Then, when the steam passes through the lower surface of the valve disk 11, the valve disk 11 is seated on the inner and outer ring valve seats 6 and 7 and is closed. When air passes through the lower surface of the valve disk 11, the valve disk 11 is seated on the inner and outer ring valve seats 6, 7 as in the case of steam, but the bimetal ring 13 expands as the temperature of the variable pressure chamber 4 decreases. Open the plurality of communication holes 13 to eliminate air binding.

The present invention can be used for a disk-type steam trap that automatically discharges condensate generated in a steam piping system.

DESCRIPTION OF SYMBOLS 1 Main body 2 Inlet 3 Outlet 4 Transformer chamber 5 Cover member 6 Inner ring valve seat 7 Outer ring valve seat 8 Annular groove 9 Inlet path 10 Outlet path 11 Valve disk 13 Bimetal ring 14 Screw 15 Communication hole

Claims (1)

A valve disc is arranged in a variable pressure chamber formed by the inner and outer ring valve seats and the lid member, and a closed bimetal ring that performs expansion / contraction action by temperature change is arranged on the outer periphery of the outer ring valve seat. One end is fixed to the outer peripheral wall of the outer ring valve seat, and a plurality of communication holes are formed in the outer ring valve seat from one end side to the other end side to communicate the annular groove between the inner ring valve seat and the outer ring valve seat. The disc type steam trap is characterized in that a plurality of communication holes are sequentially opened at a low temperature and sequentially closed at a high temperature by an expansion / contraction action of the bimetal ring due to a temperature change.

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