JPS6032076B2 - Downward bucket steam trap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steam truck with a downwardly opening bucket float.

Conventional bucket floats of this kind have a large introduction gate at the bottom.

At least steam must be introduced into the bucket float through this inlet closure to provide buoyancy to the float.
When there is a small amount of steam in the float and the float is sinking, the condensate that has flowed into the valve chamber from the inlet is pushed out from the valve port and drained to the outlet.Following the valve open state, steam flows in from the inlet. Since the inlet entrance is sufficiently wide, the steam rises and enters the bucket float with almost no resistance, and the condensate in the float similarly flows down through the inlet entrance and out of the float without resistance. Therefore, as the amount of steam inside the float increases rapidly, the float gains buoyancy and rises rapidly. Due to this sensitive response, the float floats up while oscillating, and not only does the drain valve body impactfully sit on the valve seat, resulting in severe wear, but the steam that flows into the valve chamber following the condensate is As can be seen from the fact that the condensate does not follow with a clear boundary with the condensate, but gradually increases in proportion to the rear of the preceding condensate and follows, it can be seen that a considerable amount of condensate is left on the inlet side. The float floats up and the valve port closes early, so shortly after the valve closes, condensate flows in again, causing the float to sink and the valve port to open. Therefore, the frequency of opening and closing was high, causing wear and tear on the drain valve body and valve seat, which tended to cause leaks within a short period of time after installation. Therefore, the present invention provides a steam trap with a long service life, in which the operation of the bucket float is quiet and does not float prematurely, the frequency of opening and closing of the valve is small, the wear of the drain valve body and valve seat is low, and leakage is difficult to occur. That is.

According to the present invention, this is accomplished by adding ballast to the bucket float.
This can be achieved by providing a tank. The ballast tank has an upper part that freely communicates with the inside of the bucket float, and a lower part that has a gate that is connected to the outside of the bucket float. When steam from the inlet attempts to enter the bucket float, the inflow of steam is done in response to the decrease in condensate in the ballast tank flowing out of the float through the throttling port, so Rentsu □ Due to the throttling action, the inflow of steam and therefore the increase in the amount of steam in the float becomes gradual, the float floats quietly and stably, the drain valve body seats softly on the valve seat, and the float floats too quickly. The time from when the valve port is closed after sufficiently discharging the condensate on the inlet side to the check valve is long, and the frequency of opening and closing is reduced. The condensate in the ballast tank located at the bottom of the bucket float has the same effect as a weight that eccentricizes the float's center of gravity from the spherical center toward the open side, increasing the stability of the float. Since the condensate in the ballast tank flows out from the Hasuse mouth during surfacing, it does not act to reduce the buoyancy when the surfacing valve closes, but rather the effective buoyancy increases by the amount of condensate flowing out, and the valve closes. This increases the valve force and lengthens the valve closing time. Next, a more detailed explanation will be given based on the illustrated embodiment.

Figs. 1 to 3 show an embodiment in which a bucket float is housed in a valve chamber in a free state, and the trap itself is used as a drain valve body that directly opens and closes a valve port with its outer surface as a sealing surface. A valve chamber 4 is formed by attaching a lid 3 to the main body 1 with bolts (not shown) through an airtight gasket 2. An inlet 5 provided in the side wall of the main body 1 passes through an inflow passage 6 and reaches below the valve chamber 4, and is connected to an inlet hole 8 of an inlet pipe 7 screwed onto the bottom wall of the valve chamber 4 and disposed vertically. Upper spout 9
', 9'' into the valve chamber 4. The downwardly open bucket float 10 accommodated in the valve chamber 4 in a free state is composed of a spherical shell piece 11 and a base 12. Near the top of the spherical shell piece 11. is provided with an air vent 13.The base 12 forms an introduction port 14, and the weight 0 of the entire float is transferred to a ball D so that in a natural state, the float 11 floats on the condensate with the introduction opening 14 facing downward. The base 12 has a cylindrical shape that forms the inner wall of the ballast tank 15 located below the float 10, with the lower part of the spherical shell piece 11 as the outer wall. It has a wall portion 16. The cylindrical wall portion 16 has a seven-part tubular shape with an opening at the upper end, and a small passage hole 17 is bored in the lower part.The lotus passage hole 17 is shown in the bottom view of the cap 12 in FIG. As shown, four pieces are arranged at equal intervals around the circumference, allowing the flow of condensate into and out of the ballast tank 15 in a restricted state.The spherical shell piece 11 is a drain valve whose outer surface 18 is a spherical sealing surface. It also opens and closes the valve □21 by sitting on and off the valve seat formed by the valve seat member 20 screwed onto the lid 3 through the gasket 19 for airtightness, thereby preventing the condensate in the valve chamber 4. The fluid is drained from the valve □ 21 through the outflow passage 22 to the outlet 23 under fluid pressure.The inlet 5 and the outlet 23 have a threaded portion for piping and are formed to be located on the same axis for convenience in horizontal piping. Next, the operation of the above trap will be explained.

FIG. 1 shows the valve in its closed state. That is, steam enters the float 10 from the inlet 5, the float 1 obtains sufficient buoyancy, floats in the surrounding condensate, and the sealing surface 18 hits the valve seat, causing the valve port 2 to float.
1 is closed. At this time, the inside of the ballast tank 15 is at the same water level as the cylindrical wall 16, and there is no difference from a conventional bucket float without the ballast tank 15. When condensate flows in from the inlet, the supply of steam to the inside of the float 10 is cut off, and the amount of steam accumulated inside the float 10 decreases due to escape from the vent holes 13 and condensation, and the buoyancy gradually decreases. As the buoyancy decreases, the float 1 comes into contact with the valve seat at the lower end of the valve port 21 and begins to sink while rotating counterclockwise in Fig. 1, and accordingly, the valve 21 gradually be opened. At this time, the jet from the spout 9'' on the side of the valve seat hits the opposing cylindrical wall 16 to assist the valve movement, and the jet from the spout 9' on the side opposite to the valve seat hits the opposing cylindrical wall 16. The closer the float 10 gets, the closer the float 10 becomes to the valve seat by applying an increasingly stronger push back force to the cylindrical wall 16, gently opening the float 10, and finally pulling the float 10 away from the valve seat and causing it to sink. , fully open the valve port 21. Drainage proceeds in this way,
Steam flows again from the inlet 5 to the inlet passage 6, the introduction hole 8, and the spout 9.
When the steam flows into the float 10 through the ballast tank 15 through The condensate is throttled at the lotus port 17 and its outflow is delayed.
The amount of steam in the float 10 increases very slowly, and the condensate in the ballast tank 15 acts as a weight, causing the float 10 to rise quietly and slowly. During this time, the condensate on the inlet 6 side was sufficiently discharged, the float 10 was seated on the valve seat, and the condensate in the ballast tank 15 was also gradually discharged, and the condensate there, which was acting as a weight, was discharged. The effective buoyancy increases accordingly, and the state shown in FIG. 1 is maintained for a relatively long time until the next checkpoint. FIG. 4 shows an embodiment in which the present invention is applied to a trap in which a separate drain valve element is operated via a lever using a bucket float.

A lid 33 is attached to the main body 31 with bolts (not shown) via an airtight gasket 32 to form a valve chamber 34. The inlet 35 provided on the side wall of the main body 31 is suitable for the valve chamber 34 compared to the inlet passage 36 and the inlet 37 formed at the bottom of the valve chamber 34 . A valve seat portion 38 is screwed onto the inner wall of the lid 33 via an airtight gasket, and the valve chamber 34 communicates from an inflow passage 40 to an outlet 41 through a valve port 39 formed thereby. A drain valve body 42 for opening and closing the valve ○39 is attached to a lever 44 disposed so as to be movable on the axis 43, and a hook 46 of a downwardly opening bucket float 45 is engaged with the other end of the lever 44. ing. The float 45 consists of a cylindrical body 48 having an upper end wall 47 and a cap 49 attached to its lower end. The cap 49 has a tapered tubular wall portion 50 with an open upper end, and the cylindrical portion 4
8 forms a ballast tank 51. At the bottom of the ballast tank 51, a throttle port 52 is provided at the bottom of the wall 50. There are ventilation holes 53 in the upper end wall 47.
is provided. The operation of a bucket-float type steam trap with a lever such as this embodiment is well known, and the operation of this embodiment will be explained if the explanation of the embodiments of FIGS. 1 to 3 regarding the ballast tank is also considered. I'll omit it since it's unnecessary.

This type of lever-equipped trap has a drain valve body, a valve seat, and a lever.
However, in this example, the bucket float ascends and descends quietly and slowly, and the frequency of opening and closing is 4 times. The downward bucket float type steam trap suffers less wear and has a longer life.

[Brief Description of the Drawings] Fig. 1 is a vertical cross-sectional view of a downward bucket type steam trap according to an embodiment of the present invention, Fig. 2 is an explanatory diagram showing one position of the float sinking, and Fig. 3 is a vertical sectional view of a downward bucket steam trap according to an embodiment of the present invention. The bottom view and FIG. 4 are longitudinal sectional views of a downward bucket type steam trap of another embodiment. 4...Valve chamber, 5...Inlet, 7...
Introductory pipe, 9' and 9''... spout, 10... downward open bucket float, 11... spherical shell piece, 12...
...Case, 14...Introduction Sekiguchi, 15...
・Ballast tank, 16...Wall part, 17...
...Shibori lotus opening, 21... Valve mouth, 23...
...Outlet, 34...Valve chamber, 35...Inlet,
39... Valve port, 41... Outlet, 42...
・Drain valve body, 44...Lever, 45...Downward opening bucket float, 50...Wall part, 51...
...Ballast tank. Fang 1 figure Sai 3 figure Sai 2 figure Spear 4 figure

Claims (1)

[Claims] 1. For those equipped with a downward-opening bucket float,
A downward bucket type steam trap characterized in that the float has a ballast tank whose upper part freely communicates with the upper part of the interior of the float and whose lower part has a throttle communication port.