JP2014098415A - Disc-type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a bimetal ring from being hit by a valve disc at high temperature.SOLUTION: A valve disc 11 is disposed in a variable pressure chamber 4 composed of inner and outer ring valve seats 6, 7 and a cover member 5, and an open-end bimetal ring 13 is disposed on a conical inclined surface 12 formed on an outer periphery of the outer ring valve seat 7. An open-end waveform spring ring 14 as an elastic member kept into contact with an inner wall of the outer cover member 5 at its outer periphery, is disposed outside of the bimetal ring 13, an outer periphery of the bimetal ring 13 expanded at a high temperature is kept into contact with an inner periphery of the waveform spring ring 14 to hold the bimetal ring 13 by the waveform spring ring 14, and the outer periphery of the bimetal ring 13 contracted and closed at a low temperature, is separated from the waveform spring ring 14, so that the bimetal ring 13 is not interfered by the waveform spring ring 14.

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. This utilizes the bending action caused by the temperature change of the bimetal, so that the valve disk is forcibly lifted and opened at low temperatures so as not to interfere with the valve disk at high temperatures. An example of this is shown in Patent Document 1. This is because a bimetallic ring with ends is arranged on a conical slope formed on the outer periphery of the outer ring valve seat, and air binding is eliminated by cooperation between the slope and the expansion / contraction action of the bimetal ring due to temperature change. Is. That is, the bimetal ring contracts and moves up along the slope at low temperatures, lifts the valve disc and opens the valve from the inner and outer ring valve seats, and the bimetal ring expands and lowers along the slope at high temperatures. Does not interfere with the valve disc.

Japanese Patent Publication No. 47-6825

The conventional disc type steam trap has a problem that the bimetal ring is worn or damaged. This is because the bimetal ring is vibrated up and down at high temperatures due to the impact when the valve disk is seated on the inner and outer ring valve seats and the flow resistance due to the discharged fluid, and the bimetal ring is struck by the valve disk at high temperatures. .

Therefore, the problem to be solved by the present invention is to prevent the bimetallic ring from being hit by the valve disk at high temperatures.

In order to solve the above-mentioned problems, the disc type steam trap of the present invention has a conical slope formed on the outer periphery of the outer ring valve seat by arranging a valve disk in a variable pressure chamber formed by the inner and outer ring valve seats and the lid member. Ended bimetal ring is arranged in the part, and the bimetal ring contracts and moves up along the slope part at low temperature by cooperation with the slope part and the expansion and contraction action of the bimetal ring due to temperature change valve disc In the case where the bimetal ring expands at a high temperature and moves down along the inclined surface and does not interfere with the valve disk, the outer circumference is an outer lid on the outer side of the bimetal ring. An elastic member that abuts the inner wall of the member is arranged, the outer periphery of the bimetal ring that is expanded at a high temperature contacts the inner periphery of the elastic member, the bimetal ring is held by the elastic member, and the outer periphery of the bimetal ring that is contracted at a low temperature is Elastic member Bimetal ring is characterized in that no longer interferes with the elastic member and et apart.

According to the present invention, the elastic member that contacts the inner wall of the outer lid member is disposed outside the bimetal ring, and the outer periphery of the bimetal ring that is expanded at a high temperature contacts the inner periphery of the elastic member to form the bimetal ring. Since it is held by the elastic member, the bimetal ring does not sway up and down at high temperatures, and the bimetal ring does not strike the valve disk at high temperatures.

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

On the outer periphery of the outer ring valve seat 7, a conical slope portion 12, an upper plane portion 15 and a lower plane portion 16 are formed on the upper end portion and the lower end portion of the slope portion 12, respectively, and the end bimetal ring 13 is disposed. On the outside of the bimetal ring 13, a wave spring ring 14 with ends is provided as an elastic member that contacts the inner wall of the lid member 5 whose outer periphery is outside. At a low temperature, the bimetal ring 13 contracts and moves up the inclined surface portion 12, lifts the valve disk 11, opens the valve from the inner and outer ring valve seats 6, 7, and rests on the upper plane portion 15. At this time, the outer periphery of the bimetal ring 13 is separated from the wave spring ring 14 so that the bimetal ring 13 is not interfered with the wave spring ring 14. When the temperature is high, the bimetal ring 13 expands and moves down the inclined surface portion 12 so that it does not interfere with the valve disk 11 and rests on the lower flat surface portion 16. At this time, the outer periphery of the bimetal ring 13 abuts on the inner periphery of the wave spring ring 14, and the bimetal ring 13 is held by the wave spring ring 14.

The operation of the above embodiment will be described. When the trap body is at a low temperature, the bimetal ring 13 is contracted and placed on the upper flat portion 15, and the valve disk 11 is lifted to be opened from the inner and outer ring valve seats 6, 7, and low-temperature condensate and air are discharged. Discharge. This eliminates air binding. At this time, the outer periphery of the bimetal ring 13 is separated from the wave spring ring 14 so that the bimetal ring 13 is not interfered with the wave spring ring 14.

If the high-temperature condensate flows in, the bimetal ring 13 expands, moves down the inclined surface portion 12 and rests on the lower flat surface portion 16, and does not participate in the valve disk 11. At this time, the outer periphery of the bimetal ring 13 abuts on the inner periphery of the wave spring ring 14, and the bimetal ring 13 is held by the wave spring ring 14. As a result, the bimetal ring 13 does not swing up and down at high temperatures, and the bimetal ring 13 does not hit the valve disk 11 at high temperatures. Thereafter, steam is not escaped based on the well-known operation principle of the disc type steam trap, and only condensate 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 Cover member 6 Inner ring valve seat 7 Outer ring valve seat 8 Annular groove 9 Inlet path 10 Outlet path 11 Valve disk 12 Slope part 13 Bimetal ring 14 Wave spring ring 15 Upper plane part 16 Lower side Flat part

Claims (1)

A valve disc is placed in the variable pressure chamber formed by the inner and outer ring valve seats and the lid member, and a bimetal ring with ends is placed on the conical slope formed on the outer periphery of the outer ring valve seat. By cooperating with the ring expansion / contraction action, the bimetal ring contracts and moves up along the slope at low temperatures, lifts the valve disc, opens the valve from the inner and outer ring valve seats, and opens the bimetal ring at high temperatures. Is expanded along the inclined surface and does not interfere with the valve disc, and an elastic member whose outer periphery contacts the inner wall of the outer lid member is disposed outside the bimetal ring, and the bimetal is expanded at high temperatures. The outer periphery of the ring abuts the inner periphery of the elastic member and the bimetal ring is held by the elastic member, and the outer periphery of the bimetal ring that is shrunk at a low temperature is separated from the elastic member so that the bimetal ring is not interfered with the elastic member. Toss Disc type steam trap.

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