JPS6052359B2 - steam trap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steam trap that prevents steam from entering the drain and being discharged, and more particularly to an improved structure of a steam trap in which an inverted bowl-shaped float is arranged in the drain chamber. It depends.

An inverted bowl-shaped float is arranged in the drain reservoir, and as steam accumulates in the float, it rises to the surface, or as the steam dissolves in the drain, it sinks, and as the float floats up and down, the drain outlet is closed. Steam traps that open and close are well known.

However, in a conventional steam trap equipped with an inverted bowl-shaped float, for example, in a structure in which the valve body that closes the drain outlet and the float are connected via a lever, the valve cannot be closed due to the precision of the lever. There were times when the alignment between the body and the drain outlet did not go well.

Another disadvantage was that the float could not lift a heavy valve body because the number of floating blades was small. The present invention solves the above-mentioned drawbacks, and makes it possible to easily close the drain outlet even with a small buoyancy caused by an increase in steam.
An embodiment of the drain trap according to the present invention will be described with reference to the drawings.

The drain chamber 1 has a cylindrical shape sealed by a lid 2, and has an inflow side connection port 3 on one side and a discharge side connection port 4 on the other side. 5 indicates a filter provided in the inflow path 6.

A valve seat plate 8 having a drain outlet 7 a is fixed to the ceiling surface of the drain chamber 1 with screws 9 . Valve seat plate 8
As shown in Fig. 3, three drain outlets 7a, 7b, and 7c of different sizes are provided on a concentric circle, so each drain outlet is selectively selected when tightening the screw 9. - It is made to match the outflow path 10. A stepped portion 11 is then formed on the upper inner wall surface of the drain reservoir 1, and a disk-shaped valve plate 12 is arranged on the stepped portion 11 in a horizontal position so as to be vertically movable. A drain inlet 13 is provided at the center of the bottom of the drain chamber 1, and an inverted bowl-shaped float 14 with an open bottom is placed above the drain inlet 13. The float 1
A small hole 15 is formed in the shoulder portion of 4 as is conventionally provided. The valve plate 12 has a through hole 16 in its center, and several ventilation holes 17 (see FIG. 4) around the through hole 16. The upper surface of the float 14 is a flat cylindrical truncated body 1 that can close the ventilation hole 17.
8, and a vertical shaft 19 extending through the through hole 16 is provided at the center thereof. An engaging piece 20 is fixed to the protruding portion of the vertical shaft 19 onto the valve plate 12. and float 1
4, the body 18 closes the vent hole 17 during the floating stroke of the float 14, and the engaging piece 20 engages with the valve plate 12 during the lowering stroke of the float 14. Next, the operation of the steam trap constructed in this way will be explained.

The drain that first flows into the drain reservoir chamber 1 from the drain inlet 13 through the connection port 3, the inflow channel 6, and the filter 5 accumulates in the drain reservoir chamber 1, and expels the air that was in the float 14 through the small hole 15. The liquid level of the drain gradually rises.

When the drain further flows in, the drain passes through the vent hole 17 of the valve plate 12, passes through the drain outlet 7a1 and the outlet path 10, and is discharged to the outside from the connection port 4. At that time, if steam flows in from the drain inlet 13, the steam flows through the float 14.
It gradually begins to accumulate in the upper part of the body. At this time, a part (a small amount) of the steam flows out from the small hole 15, but if the amount of steam flowing into the ribbed 14 from the drain inlet 13 is greater than the amount of steam flowing out, the amount of steam retained will increase. The float 14 becomes lighter and begins to float. As the float 14 floats up, the body 18 first comes into close contact with the vent hole 17, thereby blocking the drain from flowing through the vent hole 17 to the drain outlet 7a. Therefore, the pressure at the lower part of the valve plate 12 becomes higher than the pressure at the upper part of the valve plate 12, and the pressure difference is caused by the pressure at the lower part of the valve plate 12.
It acts in the direction of pushing up 2. Therefore, the valve plate 12 is lightly floated due to the buoyancy of the float 14 and the pressure difference, and comes into close contact with the drain outlet 7a to close it and stop the drain from flowing out. FIG. 2 shows this state. At this time, the disk-shaped valve plate 12 maintains a substantially horizontal position on the stepped portion 11 and is freely movable, so that it is firmly brought into close contact with the drain outlet 7a by the drain outlet pressure in the drain reservoir chamber 1. Perpetuate this blockage. Also, as the inflow of steam decreases, float 1
When the amount of steam in the float 4 flowing out through the small hole 15 and being dissolved and consumed becomes larger, the amount of steam accumulated in the float 14 gradually decreases, and the float 14 loses its buoyancy and begins to sink. During the lowering stroke, the engaging piece 20 comes into contact with the periphery of the through hole 16 and pulls down the valve plate 12. In that case, the drain outlet 7a attracts the peripheral edge of the valve plate 12, and the engaging piece 20
Since the central portion of the valve plate 2 is pulled down, even if a relatively small sinking blade is used under the action of a screw, the valve plate 12 can be peeled off from the drain outlet 7a by overcoming the suction force of the drain outlet 7a. Figure 1 shows the drain outlet 7
This shows the state when a is opened. Drain outlet 7
When a is opened, the drain accumulated in the drain chamber 1 is discharged to the outside from here again. Further, when steam flows in, the float 14 floats up again and pushes up the valve plate 12 in the same manner as described above, closing the drain outlet 7a. The same operation is repeated thereafter to appropriately prevent the outflow of live steam. As described in the embodiments above, the steam trap of the present invention has a stepped portion formed on the upper inner wall surface of the drain reservoir, a drain outlet provided at an eccentric position in the ceiling of the drain reservoir, and a drain outlet. A disc-shaped valve plate that opens and closes is arranged on the stepped part so that it can move up and down while maintaining a horizontal position, and a ventilation hole made in the valve plate is inserted into the upper surface of the float during the floating process. is closed, and a pressure difference is created between the upper and lower parts of the valve plate to help push the valve plate upward, so even if the buoyancy of the float is small, or the valve plate Even if it is heavy, the valve plate can be quickly pushed up with the inflow of steam to reliably close the drain outlet.

In addition, the valve plate is a simple flat disk-shaped piece and is not directly connected to the float, so it not only reliably seals the drain outlet, but also protects the float from strong impact from the water hammer. The valve part will not be damaged even if exposed to water.
Furthermore, when the float sinks, the engaging piece fixed to the vertical shaft of the float engages with the periphery of the through hole in the center of the valve plate during the sinking process and pulls off the valve plate, resulting in weak sinking. It has various advantages such as the drain outlet can be reliably opened even when using a blade, and the response to drain inflow is excellent.

[Brief explanation of the drawing]

The drawings show an embodiment of the steam trap of the present invention, in which Fig. 1 is a longitudinal sectional view, Fig. 2 is a longitudinal sectional view showing its operating state, and Fig. 3 is a cross-sectional view along the The X-ray sectional view and FIG. 4 are perspective views of the valve plate. 1...Drain storage chamber, 7a...Drain outlet, 11...Step, 12...Valve plate,
13...Drain inlet, 14...Float, 15...Small hole, 16...Through hole, 1
7... Ventilation hole, 18... Body, 19...
Vertical shaft, 20...Engagement piece.

Claims (1)

[Claims] 1. A drain inlet is opened in the center of the bottom of a sealed cylindrical drain chamber, and an inverted bowl-shaped float with a small hole is placed above the drain inlet, and steam is drawn from the drain inlet. In a steam trap in which the drain outlet is opened and closed by floating the float as water flows in, a step is formed on the upper inner wall surface of the drain chamber, and the drain flow is placed at an eccentric position on the ceiling of the drain chamber. An outlet is opened, and a disk-shaped valve plate for opening and closing the drain outlet is arranged on the stepped portion so as to be movable up and down while maintaining a horizontal position,
A through hole is provided in the center of the valve plate, and a ventilation hole is provided around the through hole, and an object that can close the ventilation hole and a vertical shaft that penetrates the through hole are protruded on the upper surface of the float. An engaging piece is fixed to the protruding portion of the vertical shaft onto the valve plate, and the engaging piece closes the vent hole during the floating stroke of the float, and the engaging piece closes the vent hole during the floating stroke of the float. A steam trap characterized in that an engaging piece is engaged with a valve plate.