JPS6212438B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steam trap using a downward-opening bucket float, and in particular, the steam trap is constructed by storing the bucket float in a free state in a valve chamber, and forming a valve surface on the upper outer surface of the steam trap. This invention relates to a free-bucket type steam trap in which a valve seat protruding from the upper part of a valve chamber is brought into direct contact to open and close a valve opening.

The conventional free bucket type steam trap is
For example, as shown in Japanese Utility Model Publication No. 53-32364, a valve seat with an open valve opening is arranged so as to protrude to the upper side of the valve chamber, and the upper part is made of a spherical shell, and the outer surface of the valve seat is used to directly operate the valve seat. A downward-opening bucket float with a valve face that opens and closes its mouth is housed freely in the valve chamber.

In the above case, when the valve is closed, that is, the bucket float floats up and the valve port is closed, if there is a leak from the valve port, the condensate in the valve chamber will decrease and the liquid level will drop. do. This drop in liquid level stops at the valve opening. At this time, the upper part of the bucket float is above the liquid level, so the steam in the bucket float above the liquid level does not exert buoyancy, so the bucket float descends, causing steam leakage. It was hot.

The present invention aims to solve such inconveniences by forming an inlet, a valve chamber, and an outlet with a valve casing, and protruding a valve seat with an open valve port that communicates the valve chamber and the outlet above the valve chamber. A downward-opening bucket float with an inlet opening at the bottom and a steam vent at the top, which introduces the inlet fluid into the interior, is placed freely inside the valve chamber so that the valve opening can be opened and closed directly with its external sealing surface. At the upper end of the bucket float, there is an inlet pipe that protrudes from the bottom of the valve housing through the introduction opening of the bucket float and into the interior of the bucket float. It is characterized by forming a concave surface to serve as a valve surface.

The action is as follows.

The bucket float of the present invention has a concave surface formed on its upper end to serve as the valve surface, so even if leakage occurs from the valve port in the closed state, the liquid level in the valve chamber will remain at the top of the bucket float. It does not fall below the outer periphery, and the buoyant force acting on the bucket float does not decrease. Therefore, the bucket float receives sufficient buoyancy and continues to float, so it does not descend and cause steam leakage.

Next, a detailed explanation will be given based on the illustrated embodiment.

A free-bucket type steam trap 1 according to the present invention shown in FIG. 1 has a lid 3 hermetically attached to a main body 2 via a gasket 4 with bolts (not shown) to form a casing, and a valve inside. A chamber 5 is formed. An inlet 6 is formed in the side wall of the main body 2. A pipe is installed there to introduce condensate generated from steam-using equipment. An inlet passage 7 is formed in the side wall of the main body 2, an introduction pipe 8 is screwed onto the bottom wall of the valve chamber 5, and the inlet 6 is communicated with the valve chamber 5 through the inlet passage 7 and the introduction pipe 8. At the upper end of the introduction pipe 8, outflow holes 9 are opened in all directions. A downward-opening bucket float 10 is accommodated in the valve chamber 5 in a free state around the introduction pipe 8. The bucket float 10 has a cylindrical side wall 11, a downwardly protruding spherical ceiling wall 12, and a concave valve surface 13 on its outer surface. has a ring-shaped cap 15
is attached to form the introduction opening 16. Base 1
5 reinforces the lower end opening of the bucket float 10 and decenters the center of gravity downward. A valve seat member 17 is hermetically screwed onto the lid 3 via a gasket 18. An annular protruding valve seat 19 is provided at the end of the valve seat member 17 facing the valve chamber 5 to form a valve opening 20 . The valve chamber 5 communicates with an outlet 21 through a valve port 20. A drain pipe is attached to the valve port 21.

The operation of the steam trap having the above configuration will be explained next. FIG. 1 shows the valve in the closed state. That is, steam is present at the inlet 6, and the steam can flow into the bucket float 10 through the inlet passage 7 and the introduction pipe 8. The bucket float 10 receives buoyancy from a large amount of steam accumulated inside the valve chamber 5.
The valve face 13 is seated on the valve seat 19 and closes the valve port 20. bucket float 10
Part of the steam inside escapes from the steam vent 14 and part condenses, but the reduced amount is compensated for by the steam at the inlet 6, thus maintaining this closed state.

Next, when condensate flows into the inlet 6 and accumulates in the inlet passage 7, and the supply of steam to the bucket float 10 is cut off, the amount of steam inside the bucket float 10 decreases as described above. The lifting force is gradually lost, the valve surface 13 separates from the valve seat 19 and sinks, and the condensate in the valve chamber 5 is forced out through the valve port 20 to the outlet 21. In this valve open state, steam flows into the inlet 6 again, flows into the bucket float 10 through the inlet passage 7 and the introduction pipe 8, and accumulates inside the bucket float 10, causing the bucket float 10 to float due to buoyancy. , until the valve face 13 seats on the valve seat 19 and closes the valve port 20 in the position shown.

The trap according to the present invention repeats the above-described operation to automatically discharge condensate while trapping steam. If there is leakage from the valve port 20 in the valve closed state, the condensed water in the valve chamber 5 will decrease and the liquid level will drop. In the present invention, the liquid level of condensate in the valve chamber 5 does not fall below the upper outer peripheral edge of the bucket float 10, and even if there is leakage from the valve port 20, the buoyant force acting on the bucket float 10 is maintained. does not decrease. Therefore, the bucket float 10 receives sufficient buoyancy and continues to float.

The above-mentioned effect can also be obtained by using the bucket float 23 shown in FIG. bucket float 2
The ceiling wall 24 of No. 3 has a conical peripheral portion and an outer surface thereof forms a valve surface 25 having a conical surface. In this case, in the valve closed position shown in the figure, the bucket float 23 always assumes a horizontal posture as shown. In addition, bucket float 23
Since the components other than those shown in FIG. 1 are almost the same as those in FIG. 1, corresponding components are given the same numbers as in FIG.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a free bucket type steam trap according to an embodiment of the present invention, and FIG. 2 is a partial sectional view similar to FIG. 1 of a trap according to another embodiment. 5: Valve chamber, 6: Inlet, 8: Inlet pipe, 10: Downward opening bucket float, 13: Valve face, 19: Valve seat, 20: Valve port, 21: Outlet, 23: Downward opening bucket float , 25: Valve surface.

Claims (1)

[Claims] 1 An introduction method in which an inlet, a valve chamber, and an outlet are formed in the valve casing, and a valve seat with an open valve port communicating between the valve chamber and the outlet is placed so as to protrude above the valve chamber, and the fluid at the inlet is introduced into the interior. A downward-opening bucket float with an opening at the bottom and a steam vent at the top is housed in a free state in the valve chamber so that the external sealing surface directly opens and closes the valve port, and the inlet fluid is directed into the bucket float. The valve is provided with an introduction pipe that projects from the bottom of the valve housing through the introduction opening of the bucket float to the inside thereof, and is characterized in that a concave surface is formed at the upper end of the bucket float to serve as the valve surface. Free bucket type steam trap.