JPH0828788A - Disc type steam trap - Google Patents

Abstract

PURPOSE:To prevent a bimetallic ring from being hit at a high temperature by a valve disc through an annular plate. CONSTITUTION:A bimetallic ring 15 having ends is arranged on a conical slant surface part 14 formed along the outer circumference of an outer ring valve seat 7. An annular plate 16 is arranged between the bimetallic ring 15 and a valve disc 9. An outer wall 17 on which the bimetallic ring 15 which is widely opened at a high temperature is stretched thereto, is formed on the outer side of the bimetallic ring 15. A stopper part 18 which is positioned higher than the upper surface of the bimetallic ring 15 during the high temperature and locks the lower surface of the annular plate 16, is formed on the outer wall 17.

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 generator which automatically discharges condensate generated in a steam piping system by opening and closing a valve disc in response to a change in pressure in a transformer chamber, that is, a thermodynamic steam chamber. -For mutraps, in particular for those that can eliminate air binding using bimetal.

Disc type steam traps open and close a valve disc, which is seated on and off a valve seat surface consisting of inner and outer ring valve seats, by automatically controlling the valve disc by the pressure change of a variable pressure chamber formed behind the valve disc. Condensate is automatically discharged. In this case, even if air flows in at the time of starting, it will be instantly closed as in the case of steam, and once closed, air will not condense unlike steam, so it cannot be opened thereafter. So-called air binding occurs. Therefore, conventionally, bimetal is used to eliminate this air binding.
This is because the bending action due to the temperature change of the bimetal is used to forcibly lift and open the valve disc at low temperature,
It is designed so that it does not interfere with the valve disc at high temperatures.

[0003]

2. Description of the Related Art An example of this is shown in Japanese Examined Patent Publication (Kokoku) No. 50-8809. This is because the end bimetal ring is arranged on the conical slope formed on the outer circumference of the outer ring valve seat.
An annular plate is arranged between the valve disc and the bimetal ring, and the air binding is eliminated by the cooperation of the slope portion and the expansion / contraction operation of the bimetal ring due to temperature change.
That is, the bimetal ring moves up along the slope portion at low temperature, lifts the valve disc through the annular plate to open and close from the inner and outer ring valve seats, and moves down along the slope portion at high temperature, No longer interferes with the valve disc.

[0004]

The above-mentioned problems have a problem in that the lower part of the bimetal ring which is in sliding contact with the slope is worn or the bimetal ring is damaged. This is because the annular plate violently fluctuates up and down at high temperature due to the impact when the valve disc is seated and separated and the flow resistance due to the discharged fluid, so that the valve disc is struck and the bimetal ring is struck through the annular plate. Is. Therefore, the technical problem of the present invention is to prevent the bimetal ring from being hit by the annular plate at a high temperature.

[0005]

SUMMARY OF THE INVENTION 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 to form an outer ring. A bimetal ring with an end is arranged on the conical slope formed on the outer periphery of the valve seat, and an annular plate is arranged between the valve disc and the bimetal ring to expand and contract the bimetal ring due to the slope and temperature change. In cooperation with the action, the bimetal ring, which is closed at low temperature, separates the valve disc from the inner and outer ring valve seats through the annular plate to eliminate air binding. An outer wall to which the expanded bimetal ring is attached is formed, and a stopper portion which is located above the upper surface of the bimetal ring at high temperature and which locks the lower surface of the annular plate is formed on the outer wall.

[0006]

The operation of the above technical means is as follows.
The air binding is eliminated by contracting and closing the bimetal ring at a low temperature and moving upward along the slope portion, lifting the valve disc through the annular plate to open and close the valve seat from the inner and outer ring seats. The bimetal ring expands at high temperature and moves downward on the slope, sticking to the outer wall located outside. With the downward movement of the bimetal ring, the annular plate also moves downward and does not interfere with the valve disc. At this high temperature, the lower surface of the annular plate is locked above the bimetal ring by the stopper portion of the outer wall and does not contact the bimetal ring. Therefore, the bimetal ring is not hit by the valve disc through the annular plate, and is not worn or damaged.

[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.

A conical slope portion 14 is formed on the outer periphery of the outer ring valve seat 7, an end bimetal ring 15 is arranged, and an annular plate 16 is arranged between the bimetal ring 15 and the valve disc 9. On the outside of the bimetal ring 15, an annular outer wall 17 is formed integrally with the main body 1. The outer wall 17 has an inner diameter slightly smaller than the outer diameter of the bimetal ring 15 which is expanded at a high temperature so that the bimetal ring 15 is attached. Also the outer wall 17
Is positioned above the upper surface of the bimetal ring 15 with the expanded upper surface, and the inner diameter of the upper surface is formed smaller than the outer diameter of the annular plate 16 so that the lower surface of the annular plate 16 is locked by the upper surface. . The upper surface of the outer wall 17 forms the stopper portion 18.

The operation of the above embodiment will be described. When the temperature of the trap body is low, the bimetal ring 15 contracts and the slope 1
4 is moved upward, the valve disc 9 is lifted via the annular plate 16 to open and close the valve, and low-temperature condensate and air are discharged. When the high-temperature condensate flows in, the bimetal ring 15 expands and moves down the slope 14 as shown in FIG. 2, and the annular plate 16 also moves down accordingly, and the bimetal ring 15 moves toward the outer wall 17. The lower surface of the annular plate 16 is locked to the stopper portion 18 of the outer wall 17 so that it does not interfere with the operation of the valve disc 9. Since the annular plate 16 is locked to the stopper portion 18 of the outer wall 17 and does not contact the bimetal ring 15 attached to the inner wall of the outer wall 17, the bimetal ring 15 is not hit. Based on the operation principle of the well-known disc steam trap, steam is not released and only condensate is automatically discharged.

Although the outer wall is formed on the main body in the above embodiment, the outer wall may be formed on the lid member or may be formed by a member separate from the main body and the lid member.

[0011]

As described above, according to the present invention, since the bimetal ring is not worn or damaged, it is possible to provide a disk type steam trap capable of maintaining a good air binding eliminating function for a long period of time. it can.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a disk type steam trap of the present invention.

[Explanation 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 9 Valve Disc 14 Slope 15 Bimetal Ring 16 Annular Plate 17 Outer Wall 18 Stopper Part

Claims (1)

[Claims] 1. A valve disc is arranged in a variable pressure chamber formed by inner and outer ring valve seats and a lid member, and a bimetal ring having an end is arranged on a conical slope formed on the outer periphery of the outer ring valve seat. Place an annular plate between the disc and the bimetal ring,
A disc that closes the valve disc from the inner and outer ring valve seats via an annular plate by the cooperation of the slope and the expansion and contraction action of the bimetal ring due to temperature changes, and the disc is closed at low temperature. In a type steam trap, an outer wall is formed on the outside of the bimetal ring to which the bimetal ring that expands at high temperature adheres, and the lower surface of the annular plate is locked above the upper surface of the bimetal ring at high temperature. A disk-type steam trap, which is characterized in that a stopper portion is formed.