JPS6128875B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a downward bucket and float type steam trap having a seal portion for opening and closing a valve port.

The downward bucket float has a vent hole that allows internal gases such as steam and air to escape, and this size is important because this type of trap rises and falls according to the amount of gas in the bucket float. It was important. If the vents are small, the operation will be slow and gas will overflow from the lower edge of the bucket, causing the bucket float to oscillate violently. If the ventilation holes are larger than necessary, the uneconomical effects of lost air cannot be ignored.

The present invention aims to eliminate such inconveniences, and the steam trap according to the present invention is characterized in that the bucket float has a control hole at a position opposite to the float seat. According to the present invention, when the bucket float is in contact with the float seat, that is, when the valve is closed, the control hole is closed by the float seat, and water condenses in the gap between the float seat and the outer surface of the float. exists, and the gas in the float faces resistance from the surface tension of the condensate in order to escape from the control hole, so the amount of air escape from the control hole is extremely small.
When the amount of gas in the bucket float decreases and the buoyancy force decreases, the bucket float moves away from the float seat, the gas in the float quickly escapes through the control hole, and the bucket float sinks quickly. Clear valve opening operation can be obtained. In addition, when the bucket float floats up and approaches the float seat during the operation leading to valve closing, the control hole is quickly blocked, so the escape of gas from inside the bucket float is rapidly restricted, and the The amount of gas increases rapidly, and the float quickly rises to the surface and clearly blocks the valve port. At the same time, the air from the control hole hits the float seat and causes the bucket float to gently sit on the float seat.

A ventilation hole may be provided separately from the control hole to ensure ventilation from within the bucket float. Furthermore, the bucket float can be easily implemented by having a spherical or planar seal portion.

Next, the illustrated embodiment will be described in detail. 1st, 2nd
In the one shown in the figure, a bottom member 1 has an inlet 2 formed in the center, and a main body 4 is attached via a gasket 3 for airtightness. The inlet 2 communicates with the valve chamber 6 through an inlet pipe 5 extending coaxially from the inlet 2, and a downward bucket float 7 is housed in a free state around the inlet pipe 5. The bucket float 7 has a bell shape with a periphery of a hemispherical shell extending downward into a cylindrical shape, and a hemispherical seal portion 8 on the upper part directly opens and closes a valve port 10 that communicates the upper part of the valve chamber 6 with the outlet 9. A control hole 11 is provided at the top of the bucket float 7.
are provided, and the float seats 12 are positioned facing each other as shown in the figure. 13 is a ventilation hole to ensure a certain amount of air escape. bucket float 7
If there is sufficient gas inside, the bucket float 7 floats up as shown in the figure, and its top portion is seated on the float seat 12, and the seal portion 8 closes the valve port 10. At this time, the condensate existing in the gap between the float seat 12 and the outer surface of the float 7 uses its surface tension to water-seal the gas trying to escape from the control hole 11. As condensate rises from the inlet 2 through the introduction pipe 5, the gas in the float 7 decreases, and the float 7 loses its buoyancy and begins to sink. Then, the float seat 12
The water seal is broken, and the gas in the float 7 flows into the control hole 11.
The float 7 quickly sinks and opens the valve port 10 with a clear movement. If gas such as steam enters the float 7 from the inlet 2 again, the bucket float 7 will float, but as it approaches the valve closing position,
The closer the top is to the float seat 12, the more rapidly the control hole 11 is constricted and the amount of gas in the float 7 increases rapidly, closing the valve port 10 with a distinct action. At the same time, the float 7 is softly seated on the float seat 12 due to the effect of the escape air flow from the control hole 11.

In the other embodiments shown in FIGS. 3 and 4, the bucket float 7' is cylindrical with a circular upper end surface;
The upper end surface forms a planar seal 8', whereas the valve opening 10' is located at the ceiling of the valve chamber 6. The ventilation hole 13' is provided in the upper part of the side wall of the float 7'. Since the other configurations are almost the same as those in FIGS. 1 and 2, corresponding components are given the same reference numerals and explanations will be omitted. In this case as well, control hole 1
1 has the same effect as in FIGS. 1 and 2, but since it is obvious that there is no need to explain it, the explanation will be omitted.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a bucket-and-float type steam trap according to an embodiment of the present invention, FIG. 2 is a plan view of the float shown in FIG. 1, and FIG. A vertical sectional view of the trap, and FIG. 4 is a partial perspective view of the float of FIG. 3. 1 is a bottom member, 2 is an inlet, 4 is a main body, 5 is an introduction pipe, 6 is a valve chamber, 7 and 7' are downward bucket floats, 8 and 8' are seal parts, 9 is an outlet, 10 is a valve port, 11 is a control hole, 12 is a float seat, 13 and 1
3' is a ventilation hole.

Claims (1)

[Scope of Claims] 1. A bucket float equipped with a downward bucket float having a seal portion for opening and closing a valve port, wherein the bucket float has a control hole at a position facing the float seat. Float type steam trap. 2 In what is stated in claim 1,
A bucket float is a bucket float steam trap characterized by having a vent that is always open. 3. A bucket-and-float type steam trap according to claim 1 or 2, characterized in that the sealing portion of the bucket-float is spherical. 4. A bucket-and-float type steam trap according to claim 1 or 2, characterized in that the sealing portion of the bucket-float is flat.