JP2012167802A - Disc type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc type steam trap in which a structure is simplified.SOLUTION: A pressure changing chamber 4 in communication with an inlet 2 and an outlet 3 of a body 1 is formed of lid member 5 and the body 1. An inner ring valve seat 6 and an outer ring valve seat 7 are formed in a cocentric shape in the opening end of the side of the pressure changing chamber 4 of the inlet 2 and the outlet 3 and an annular groove 8 is formed between them. A valve disc 11 separating from and sitting on the upper end of the inner and outer valve seats 6, 7 is arranged in the pressure changing chamber 4. The valve disc 11 is formed of a disc-shape bimetal. The valve disc 11 formed of the bimetal is inverted upward convexly and discharges low temperature condensed water or low temperature air outside of a system from the outlet 3 when the low temperature air or the low temperature condensed water flows into the pressure changing chamber 4 from the inlet 2. The valve disc 11 is inverted downward convexly and sits on the inner and outer valve seats 6, 7 and prevents the discharge of high temperature steam when the high temperature steam or the high temperature condensed water flows in, and is separated from the valve seats and discharges only the condensed water to the outlet 3 when the high temperature condensed water flows in.

Description

The present invention relates to a disk-type steam trap that automatically discharges condensate generated in a steam pipe system to the outside by opening and closing a valve disk in response to a pressure change in a variable pressure chamber.

In the disc type steam trap, the valve disc that is attached to and detached from the valve seat surface consisting of the inner and outer ring valve seats is controlled by the pressure change in the variable pressure chamber formed behind the valve disc to open and close the condensate. It is automatically discharged. 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. This is because the valve disk is forcibly lifted and opened at low temperatures by using the bending action caused by the temperature change of the bimetal arranged separately from the valve disk so that it does not interfere with the valve disk at high temperatures. is there. An example of this is shown in Patent Document 1. This is because an end ringed bimetal ring is disposed on a conical slope formed on the outer periphery of the outer ring valve seat, and an intervening ring is disposed between the valve disk and the bimetal ring. The air binding is eliminated by cooperation with the expansion / contraction action. That is, the bimetal ring moves up along the slope at low temperatures, lifts the valve disc via the intervening ring and opens the valve from the inner and outer ring valve seats, and moves down along the slope at high temperatures. No interference with the valve disc.

Japanese Patent Publication No. 50-8809

The conventional disc type steam trap has a problem that the number of parts increases and the structure becomes complicated because the bimetal must be arranged separately from the valve disc.

Therefore, the problem to be solved by the present invention is to obtain a disk type steam trap having a simplified structure.

In order to solve the above problems, the disc type steam trap of the present invention has an inlet, an outlet and an inner / outer ring valve seat formed in the main body, and the valve disc is formed in the variable pressure chamber formed by the inner / outer ring valve seat and the lid member. In the arrangement, the valve disk is formed of a disc-like bimetal that can be reversed according to temperature.

According to the present invention, since the valve disk is formed of a disc-shaped bimetal that can be reversed in accordance with the temperature, it is not necessary to separately provide the valve disk and the bimetal, thereby simplifying the structure.

It is sectional drawing of the disk type steam trap which concerns on embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. An inlet 2 and an outlet 3 are formed on the horizontal axis of 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 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. 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.

A valve disk 11 that is attached to and detached from the upper ends of the inner and outer ring valve seats 6 and 7 is disposed in the variable pressure chamber 4. The valve disk 11 is formed of a disc-like bimetal, and the state shown in FIG. The state shown in FIG. 1 shows a state in which a mixed fluid of high-temperature steam or condensate flows into the variable pressure chamber 4 from the inlet 2 and the valve disk 11 formed of bimetal is in a high-temperature state.

  On the other hand, when low-temperature condensate or air flows into the variable pressure chamber 4 from the inlet 2, the valve disk 11 formed of bimetal is in a low-temperature state, and although not shown, it is reversed and deformed upwardly. When the valve disk 11 is thus deformed upwardly, the inlet 2 and the outlet 3 are communicated with the bottom surface of the variable pressure chamber 4 via the annular groove 8.

The operation of the disc type steam trap will be described. When low temperature air or condensate flows into the variable pressure chamber 4 from the inlet 2 at the initial start-up, the valve disk 11 formed of bimetal is inverted upwardly so that the inlet 2 and the outlet 3 communicate with each other. As a result, low-temperature condensate and air are discharged from the outlet 3 to the outside of the system.

Subsequently, when high-temperature steam or condensate flows, the valve disk 11 formed of bimetal becomes a high-temperature state, and as shown in FIG. 1, it reverses in a convex shape downward and sits on the inner and outer ring valve seats 6 and 7. Therefore, the steam does not escape based on the well-known operation principle of the disc-type steam trap that prevents the discharge of high-temperature steam and leaves the condensate when the high-temperature condensate flows in. Only water is automatically discharged.

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 Lid member 6 Inner ring valve seat 7 Outer ring valve seat 8 Annular groove 9 Inlet path 10 Outlet path 11 Valve disk

Claims (1)

In the main body, an inlet / outlet and inner / outer ring valve seats are formed, and a valve disk is arranged in a variable pressure chamber formed by the inner / outer ring valve seats and a lid member. A disc-type steam trap characterized by being made of bimetal.

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