JPS6199797A - Disk type steam trap - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This field of industrial application relates to a disc-type steam trap that is attached to a steam piping system and automatically discharges condensate generated therein, and in particular uses bimetal to prevent air locking. Regarding things.

The disc type steam trap automatically controls the valve disc, which sits at 111 W against the valve seat surface consisting of the inner and outer ring valve seats, to open and close by controlling the pressure change to the point of transformation formed behind the valve disc to automatically open and close the valve. It is something that is discharged.

In this disc-type steam trap, even if low-temperature condensate or air flows in during startup, the valve disc cannot be opened due to the air remaining in the transformer blank, and the When air flows into the valve, the valve closes instantaneously, just like in the case of steam, and once the valve is closed, unlike steam, air does not cause condensation, so even if condensate flows in, the valve cannot be opened. Rocking occurs.

BACKGROUND OF THE INVENTION Conventionally, a technique has been used to eliminate air locking using a bimetal, as disclosed in Japanese Patent Publication No. 8809/1983.

A bimetal ring is placed on the outer periphery of the outer ring valve seat with a tapered part and a flat part on the top of the tapered part, and an appropriate gap is provided between the outer ring valve seat and the inner cover on the bimetal ring so that the outer ring valve seat and the inner cover can slide up and down. The bimetal ring contracts and closes based on the temperature drop and moves upward along the Taber surface, forcing the valve disk upward. This eliminates air locking by opening the valve and discharging the air inside the variable pressure chamber.

Problems to be Solved by the Invention However, in this case, the problem is that the temperature at which the bimetal ring expands and the valve disk closes varies.

In other words, dimensions such as the height and diameter of the bimetal ring, the height and diameter of the tapered part and flat part on the outer periphery of the outer ring valve seat, the height and diameter of the annular plate, and the surface roughness of the tapered surface and the annular plate on which the bimetal ring slides. This is because many parts require precision machining, such as finishing, and variations in dimensions and surface roughness occur.

A technical problem of the present invention is to reduce variations in dimensions by reducing the number of parts that require precision processing.

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems is to provide a disk on the upper surface of the valve disk with a diameter larger than the valve disk and slightly smaller than the inner circumferential wall of the inner lid. An inverted bimetal of the shape is mounted and connected at the center of the valve disk, and an annular bimetal seat is provided on the outer periphery of the outer ring valve seat, and when the humidity is low, the inverted bimetal inverts upward into a convex shape and the peripheral edge becomes the bimetal seat. When the valve comes into contact with the valve, the central part rises to forcibly lift the valve disc to open the valve, and when the temperature is high, it inverts downward into a convex shape and the peripheral edge part moves away from the bimetal seat.

When the inverted bimetal is heated or cooled,
It transforms between two shapes with a snap action at a set temperature.

The bimetal seat may be formed integrally with the valve seat member or the inner cover, or may be formed separately and arranged.

action The operation of the above technical means is as follows.

By inverting the inverted bimetal into a convex upward shape when the humidity is low, the peripheral edge portion touches the bimetal seat, and the center portion rises, the valve disk is lifted to eliminate air locking, and when the humidity is high, it inverts into a convex downward shape. Since the peripheral edge portion is moved away from the bimetal seat, the diameter of the inverted bimetal and the height and diameter of the bimetal seat may be machined to predetermined dimensions so that the peripheral edge portion of the inverted bimetal comes into contact with and separates from the bimetal seat. Since the valve disk is rotated by the snap action of the reversing bimetal, the amount of lift is large and accuracy in the height of the bimetal seat is not required.

Furthermore, since the inverted bimetal only touches and separates from the bimetal seat and does not slide, there is no need for finishing such as polishing. Therefore, there are fewer parts that require detailed VJ processing, and variations in dimensional accuracy are reduced.

Effect of the invention The present invention produces the following unique effects.

Since there is little variation in the valve closing temperature, there is no possibility that the valve closes before air removal is completed, and air removal is ensured.

Since fewer parts require precision processing, production costs can be reduced.

Since the valve disk is lifted and opened by reversing the inverted bimetal, the amount of lift is increased, low-temperature condensate can be removed in a short time, and startup time can be shortened.

Since the inverted bimetal only touches the bimetal seat at the peripheral edge and does not slide, there is no wear due to 1m of sliding.
Longer lifespan.

Embodiment An embodiment illustrating a specific example of the above technical means will be described. (
(See Figures 1 and 2) An inlet 2 and an outlet 3 provided on the main body 1 on substantially the same axis;
A recess 5 for attaching the valve seat member 4 is formed. The inlet 2 communicates with the center of the recess 5 through the screen 6, and the outlet 3
communicates with the periphery of the recess 5.

The valve seat member 4 is disposed in the recess 5 via two annular gaskets, and is fastened to the main body 1 through a bimetal seat 18 with an inner part 117 screwed onto the inner peripheral side wall of the recess 5. Bimetal seat 1
8 also serves as a gasket to maintain airtightness between the valve seat member 4 and the inner lid 7. A variable pressure chamber 8 is formed between the valve seat member 4 and the inner lid 7.

An inlet hole 9 is provided through the center of the valve seat member 4 to form an inlet 2.
At the same time, an annular groove 10 is provided around the periphery to communicate with the outlet 3 through the outlet hole 11, and the inlet hole 9 and the annular groove 1
An annular inner ring valve seat 12 is formed between the grooves 10 and 10, and an annular outer ring valve seat 13 is formed outside the annular groove 10. A valve disk 14 is placed in the variable pressure chamber 8 to take off from and land on the inner and outer ring valve seats 12 and 13 at the same time. An outer cover 15 is screwed onto the outside of the inner cover 7 via a gasket, and a heat preservation chamber 17 is connected to the inlet 2 side through a through hole 16.
form.

The valve disk 14 is formed into a spherical shape with a swollen center portion on the upper surface, and an inverted bimetal 19 is placed on the upper surface, and the center portion is fixed with a screw 20. The inverted bimetal 19 has a larger diameter than the valve disk 14, a slightly smaller diameter than the inner circumferential wall of the inner 17, and has a low f! When the humidity is low, it turns upward into a convex shape and becomes the same curved surface as the spherical surface of the upper surface of the valve disk 14, and the peripheral edge portion contacts the bimetal seat 18, and when the temperature is high, it turns downward into a convex shape and becomes the same curved surface as the spherical surface of the upper surface of the valve disk 14. The portion separates from the bimetal seat 18.

The operation of the above embodiment will be explained.

At the time of startup, the inside of the trap is at a low temperature, and as shown in FIG. (open the valve). A large amount of low-temperature condensate and air flowing through the inlet 2 and the inlet hole 9 flows into the annular groove 1.
0, is discharged through the discharge hole 11 and the discharge port 3 in a short time. Next, when high-temperature condensate flows in, the inverted bimetal 19 is heated and inverted downward into a convex shape, so that the peripheral edge part separates from the bimetal seat 18. Thereafter, based on the operating principle of the well-known disk steam trap, steam is not released and condensate is discharged. When air flows into the variable pressure chamber 8 during operation, the valve disk 14 closes, but when the temperature inside the variable pressure chamber 8 drops to a predetermined temperature, the bimetal 19 turns upward into a convex shape and closes the valve disk 1.
Open valve 4 to eliminate air locking.

In this embodiment, the bimetal seat 18 can also serve as a gasket, and the number of parts can be reduced.

The inverted bimetal 19 may be attached to the valve disk 14 by welding or caulking.

[Brief explanation of drawings]

The drawings show a disc-type steam trap according to an embodiment of the present invention, and FIG. 1 is a sectional view showing the valve open state at low humidity;
FIG. 2 is a sectional view of the main part showing the valve closed state at high temperature. 4: Valve seat member 7: Inner cover 8: Variable pressure chamber 10: Annular groove 12: Inner ring valve seat 13: Outer ring valve seat 14: Valve disk 18: Bimetal seat 19: Inverted bimetal

Claims (1)

[Claims] (1) A disk-shaped inverted bimetal with a diameter larger than the valve disk and slightly smaller than the inner circumferential wall of the inner cover is placed on the upper surface of the valve disk, connected at the center of the valve disk, and an annular bimetal is placed on the outer periphery of the outer ring valve seat. A bimetal seat is provided, and when the humidity is low, the inverted bimetal flips upward into a convex shape, the peripheral edge portion contacts the bimetal seat, and the center portion rises, forcing the valve disc to lift and open the valve, and when the temperature is high, it convexes downward. A disc-type steam trap whose peripheral edge part is separated from the bimetal seat by inverting the shape.