JPS6032075B2 - Bucket float steam trap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steam trap using a downward bucket float, which is used when discharging condensate generated in steam-using equipment.

This type of trap houses a downward bucket float with an inlet at the bottom in a valve chamber, and the fluid from the inlet is introduced into the bucket float through the inlet at the bottom of the float. If so, it will receive buoyancy from the introduced gas and float on the condensate in the valve chamber, and if condensate is introduced, it will sink under its own weight, and a separate discharge valve means will be operated.
Alternatively, the valve □ is made to open and close using a sealing surface provided on its outer surface.

For this reason, the downstream bucket float type steam trap has an extremely small discharge capacity for non-condensable gases such as air, and the bucket float oscillates when the valve is closed, causing a small barrier, which also causes the float to oscillate. There were disadvantages such as a vicious cycle. That is, when air is introduced into the bucket float, the float floats up and closes the valve port in the same way as when steam is introduced. After that, the air inside the float escapes to the upper part of the valve chamber from the small vent hole provided at the top of the float, but the pressure difference between the inside and outside of the float is extremely small, and the small vent hole is also very small, so this vent air escapes. It takes a long time to
Moreover, when the float loses its buoyancy and sinks in this way and opens the valve □, all the air from the inlet is introduced into the float.
The float rises again and closes the valve port. This kind of operation is repeated, or equilibrium is reached in a state of a minute barrier, resulting in an extremely small discharge capacity for non-condensable gas. In addition, it is inevitable that the valve body is cooled by the outside air, so when the valve is closed, the steam inside the valve chamber condenses and the pressure inside the valve chamber decreases, so steam is actively introduced from the inlet. will be done. At this time, the bubbles of the introduced steam agitate the bucket float, or furthermore, a part of the introduced steam leaks out from the lower opening of the bucket float, violently agitating the float and the liquid level. This causes unnecessary disputes.
This barrier valve also rapidly lowers the pressure in the valve chamber, causing the float to oscillate more violently due to the introduction of steam. This vicious cycle increases steam loss and eventually leads to a situation where the steam is blown out.
The present invention aims to solve such inconveniences by providing a steam replenishment passage that carries the inlet and the upper part of the valve chamber in contrast to the inlet passage that introduces the fluid at the inlet into the introduction opening □ at the bottom of the bucket float. It is characterized by the fact that it has been provided.

Steam must be replenished into the float to compensate for the amount of steam that condenses when the valve is closed. This increases the flow resistance by making the replenishment passage narrower, and the minimum necessary amount of steam is allowed to float through the inlet passage. be able to be introduced internally. Since only a small back pressure equivalent to the reaction force of the buoyant force acting on the float is acting on the inlet passage, the supply passage may be quite large; for example, a hole with a diameter of 2 mm will give good results. It was done. The embodiment shown in FIGS. 1 and 2 will be described.

A valve chamber 4 is formed by attaching a diamond 3 to the main body 1 via a gasket 2 for airtightness. The inlet 5 extends below the valve chamber 4 through an inflow passage 6, and enters the valve chamber 4 through an introduction hole 8 of an introduction pipe 7 screwed vertically into the bottom wall of the valve chamber 4. A downward bucket float 9 having a substantially inverted bowl shape is accommodated in the valve chamber 4 in a free state. There is a small air hole 10 on the top of the float 9.
is provided, a base 20 serving as a weight is attached to the lower part thereof, and an introduction opening row 1 through which an introduction pipe 7 passes is provided. The valve seat member 13 is a gasket 1 for maintaining airtightness.
2 is screwed onto the lid 3 to form a valve □15 that allows the valve chamber 4 to flow into the outlet 14. The valve seat member 13 is provided with a fulcrum 18 of a lever 17 provided with a hemispherical valve body 16 for opening and closing the valve □ 15, and the end of the lever 17 is connected to the engaging portion 19 of the float 9.
I'm playing with you. 21 is a pongee hole that bypasses the upper part of the valve chamber 4 and the inlet 5 in a constricted state, and forms a steam supply passage.

The operation of the above embodiment will be explained. FIG. 1 shows that steam flows from the inlet 5 through the introduction hole 8 into the float 9, and
The figure shows a state in which the valve □15 floats under the influence of buoyancy and closes the valve □15 via the lever 17 and the valve body 16. In this state, the valve chamber 4
The steam accumulated in the upper part of the pupil bodies 1 and 3 is condensed by being cooled by the outside air, and the pressure inside the valve chamber 4 decreases, causing the steam on the inflow passage 6 side to flow into the valve chamber 4 from the introduction hole 8. However, steam is supplied from the pongee hole 21 in accordance with the pressure drop in the valve chamber 4, and the introduction of steam through the introduction hole 8 is suppressed to a minimum. Therefore, the amount of steam introduced from the introduction hole 8 is small, and the bubbles of the introduced steam cause the float 9 to move, or furthermore,
There is no need to worry about a part of the introduced steam leaking out from the inlet port 11 of the float 9 and violently agitating the liquid level in the float 9 and the valve chamber 4, and it is possible to prevent unnecessary bulging and reduce steam loss. can. When air flows from the inlet 5 through the introduction hole 8 into the float 9, F.

The valve port 9 receives buoyancy and enters the closed state shown in FIG. However, unlike steam, air is non-condensable, and no pressure difference is created even by outside air cooling, and the pressure inside the valve chamber 4 (including inside the float 9) is almost equalized through the inlet 5 side and the mesh hole 2.
As shown in Figure 1, the introduction hole 8
As shown in Fig. 2, the condensate that was kept inside flows into the passage 6 side, the air inside the float 9 returns to the introduction hole 8, and this amount of condensate from the valve chamber 4 side flows into the float 9. As shown in FIG. 2, the liquid in the float 9 rises and at the same time the liquid level on the valve chamber 4 side decreases, the buoyant force acting on the float 9 decreases, the float 9 sinks, and the lever 17 and valve Valve □1 through body 16
Open 3. Therefore, the pressure inside the valve chamber 4 decreases rapidly, and the air accumulated in the float 9 and the upper part of the valve chamber 4 is discharged to the outlet 14 through the valve □15. It can be discharged reliably on time. Next, the embodiment shown in FIG. 3 will be described.

A valve chamber 35 is formed by attaching a lid 33 to the main body 31 with bolts 34 via an airtight gasket 32. Entrance 36
extends below the valve chamber 35 via the inflow passage 37, and
The introduction pipe 38 is screwed perpendicularly to the bottom wall and is inserted into the valve chamber 35 through the introduction hole 39 and the entrance 40. A generally spherical downward bucket float 41 made of a metal spherical shell is freely accommodated within the valve chamber 35. A small vent hole 42 is provided in the upper part of the float 41, and a cap 4 serving as a weight is provided in the lower part.
3 is attached to the entrance 44 for introducing fluid from the inlet 36.
is formed, and the outer spherical surface 45 forms a sealing surface for closing the valve port described below. The valve seat member 46 is screwed onto the main body 31 via an airtight gasket 47 to form a valve opening 49 that connects the valve chamber 35 to the outlet 48 . Bottom wall 50 of valve chamber 5
has a downward slope in the direction away from the valve port 49,
In the lowered position of the float 41, the base 43 rests on the bottom wall 50, the ceiling inner wall rests on the top surface of the introduction pipe 38, and the float 41 is inclined in a direction away from the valve □49.

The square seat 52 on the end face of the valve seat member 46 on the side of the square chamber is formed into a spherical shape, so that the surface of the float 41 can smoothly abut thereon. Reference numeral 51 denotes a small hole that bypasses the inlet 36 and the valve chamber 35 in a constricted state, and forms a steam replenishment passage.

The operation of the above embodiment will be explained.

When steam flows from the inlet 36 through the introduction hole 39 and the closing port 40 into the float 41, the float 41 receives levitation and floats up as shown in the figure, closing the valve port 49 with the sealing surface 45.
In this state, the steam accumulated in the upper part of the valve chamber 35 flows into the bonito body 3.
1 and 33 are condensed by being cooled by outside air, and the pressure inside the valve chamber 4 decreases, but since the steam on the inlet 37 side is replenished from the small hole 51, the amount of steam introduced from the introduction hole 39 is minimized. Being held down. Therefore, the amount of steam introduced from the introduction hole 39 side is small, and bubbles of the introduced steam may agitate the float 41, or furthermore, a part of the introduced steam may leak from the introduction port 44 of the float 41, causing the float 41 and the valve chamber 39 to be damaged. This prevents the liquid level within the tank from being violently agitated, which causes a vicious cycle due to small valve openings and causes steam loss. Furthermore, if the opening □ 40 of the introduction pipe 38 is provided so as to face the gas region of the float 41 as in this embodiment, the introduced steam will flow to the float 41.
This is effective in preventing the generation of bubbles and the resulting movement of the float 41 when the liquid is introduced into the liquid layer 1. When air flows from the inlet 36 through the introduction hole 39 into the float 41, the float 41 receives buoyancy and enters the closed state as shown in the figure.

However, unlike steam, air is non-condensable, and no pressure difference is created even by cooling with outside air, and the pressure inside the valve chamber 35 (including inside the float 41) is almost equal to that on the inlet 36 side, and the pressure decreases due to cooling with outside air. The condensed water is kept in the inlet hole 39 by the float 41, and the condensate flows to the inflow passage 37 side
The air inside returns to the introduction hole 39, and the float 4
The condensate on the valve chamber 35 side is sucked into the float 41, the liquid level in the float 41 rises, and at the same time the liquid level on the valve chamber 35 side decreases, the buoyant force acting on the float 41 decreases, and the float 41 sinks. Open valve □49. Therefore, the pressure inside the valve chamber 35 decreases rapidly, and the air accumulated in the float 41 and the upper part of the valve chamber 35 is discharged to the outlet 48 through the valve port 49. It can be discharged reliably on time. FIG. 4 shows only the steam supply passage portion of another embodiment.

However, equivalent parts common to the embodiment of FIG. 3 are given the same reference numerals and explanations will be omitted. The above-mentioned replenishment passage consists of a vertical hole 62 into which a valve shank 61 is screwed so that it can be screwed forward and backward, and a horizontal hole 63 extending from the different diameter part of this vertical hole 62 to the upper part of the valve chamber 35, and includes the inlet 36 legs and the valve chamber 35. It is connected to Room 35. The valve stem 62 has a conical portion 64 at its lower end, and is operated by applying a tool such as a spanner to a chamfered portion 65 provided at its upper end to adjust the passage area of the supply passage. 66 is a lock nut.

Therefore, according to this embodiment, the amount of steam passing through the replenishment passage can be adjusted, so that the range of application can be expanded. As described above, according to the present invention, the amount of steam condensed when the valve is closed can be compensated for by steam from the supply passage that connects the inlet side and the upper part of the valve chamber. It is possible to minimize the occurrence of air bubbles due to the introduction opening, and prevent unstable operation due to float oscillation. This is particularly advantageous for applications such as the embodiment of FIG. 3 in which the valve port is opened and closed directly by a float. In addition, the replenishment passage equalizes the pressure in the valve chamber (including the inside of the float) and the inlet side to reduce the buoyant force acting on the float, promotes the barrier valve, and reliably discharges non-condensable gases such as air in a short time. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a bucket float type steam trap according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing another operating state of the embodiment of FIG. 1, and FIG. 3 is another embodiment. FIG. 4 is a partial cross-sectional view of another embodiment. 1 and 31 are the main body, 3 and 33 are lids, 4 and 35 are valve chambers, 5 and 36 are inlets, 8 and 39 are introduction holes, 9 and 41 are bucket floats, 10 and 42 are small vent holes, 11 and 44 is an introduction opening, 14 and 48 are outlets, 15 and 49 are valves □, and 21, 51, 62, and 63 are pores, vertical holes, and horizontal holes forming supply passages. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. In a valve chamber equipped with a downward bucket float having an introduction opening at the lower part, an inlet is provided for an inflow passage that introduces fluid from the inlet into the bucket float through the introduction opening. A bucket-to-float type steam trap characterized by having a bypass replenishment passage in the upper part of the valve chamber. 2. A bucket-and-float type steam trap according to claim 1, wherein the supply passage is a pore provided in a partition wall between the inlet and the upper part of the valve chamber. 3. A bucket-and-float type steam trap according to claim 1, wherein the valve chamber end of the inflow passage opens into a gas region within the bucket-float when the valve is closed. . 4. A bucket-and-float type steam trap according to claim 1, wherein the bucket-to-float has a sealing surface on its outer surface for directly opening and closing a valve port. 6. A bucket and float type steam trap according to claim 1, characterized in that an adjustable throttle valve means is provided in the supply passage.