JP2010065831A - Downward bucket type steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a downward bucket type steam trap eliminating valve leak by enhancing valve close force. <P>SOLUTION: An inlet 5, a valve chamber 4 and an outlet 14 are formed on a valve casing comprising a body 1 and a cover 3. A valve port 15 providing communication between the valve chamber 4 and the outlet 14 is formed at an upper part of the valve chamber 4. A downward bucket 9 provided with an introduction opening 11 at a lower part and an air releasing hole 10 at an upper part is stored in the valve chamber 4. The valve port 15 is opened and closed by a valve element 18 connected to the downward bucket 9 through a lever 17. The air releasing hole 10 of the downward bucket 9 is positioned right below the valve element 18 opening and closing the valve port 15. A communication hole 21 opening to a side surface from as lower surface of the valve element 18 is formed. When the valve element 18 closes the valve port 15, an opening end of the air releasing hole 10 of the downward bucket 9 abuts on a lower end of the valve element 18, the valve element 18 is pressed against the valve port 15, and gas flowing out through the communication hole 21 from the air releasing hole 10 impinges on the valve element 18 and acts on the valve element 18 as valve closing force. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a steam trap that is attached to a steam piping system and automatically discharges condensate generated therein, and more particularly, a downward bucket type steam trap that opens and closes a valve port by the rising and falling of a downward bucket housed in a valve chamber. Regarding improvements.

  The conventional downward bucket type steam trap forms an inlet, a valve chamber and an outlet with a valve casing, forms a valve port communicating with the valve chamber and the outlet in the upper part of the valve chamber, and introduces an opening in the lower part to an air vent in the upper part The downward bucket provided with is accommodated in the valve chamber, and the valve port is opened and closed with a valve body connected to the downward bucket via a lever. When steam flows into the downward bucket from the inlet, the downward bucket receives buoyancy and rises, and the valve element closes the valve opening via the lever. When the condensate flows into the inlet and the supply of steam into the downward bucket stops, the steam in the downward bucket decreases due to cooling condensation and escape from the vent holes, and the downward bucket loses buoyancy. The valve body opens through the lever, and the condensate in the valve chamber is discharged from the valve port to the outlet. When steam flows into the downward bucket due to the discharge of the condensate, the downward bucket rises again, and the valve element closes the valve opening via the lever. Such an operation is repeated.

However, in the above-described conventional system, in the closed state where the valve body closes the valve port, the valve closing force acting on the valve body is only the fluid pressure on the inlet side. There was a problem that leakage was likely to occur.
Japanese Patent Publication No. 60-32076

  Therefore, the technical problem of the present invention is to provide a downward bucket type steam trap which increases the valve closing force and does not cause valve leakage.

  The technical means of the present invention devised to solve the above technical problem is that a valve casing forms an inlet, a valve chamber, and an outlet, and a valve port that communicates the valve chamber and the outlet is formed in the upper portion of the valve chamber. A valve that opens and closes a valve opening with a valve body that houses a downward bucket with an introduction opening at the bottom and an air vent at the top and is connected to the downward bucket via a lever. The vent hole provided in the upper part of the downward bucket is located directly below the body, and a communication hole is formed from the lower surface of the valve body that opens and closes the valve port to the side surface. When the valve body that opens and closes the valve port closes the valve port The opening end of the vent hole of the direction bucket abuts the lower end of the valve body that opens and closes the valve port, and the valve body that opens and closes the valve port is pressed against the valve port, and the gas that passes through the communication hole from the vent hole opens the valve port. Acts as a closing force on the valve body that opens and closes the valve opening by hitting the valve body that opens and closes And it is characterized in and.

  According to the present invention, when the valve body that opens and closes the valve port closes the valve port, the opening end of the vent hole of the downward bucket presses the valve body that opens and closes the valve port against the valve port and from the vent hole through the communication hole Since the gas that exits acts as a valve closing force on the valve body that opens and closes the valve port, the valve closing force is increased, resulting in an excellent effect of preventing valve leakage.

  The downward bucket type steam trap of the present invention locates the vent hole provided in the upper part of the downward bucket just below the valve body that opens and closes the valve port, and forms a communication hole from the lower surface to the side surface of the valve body that opens and closes the valve port When the valve body that opens and closes the valve opening closes the valve opening, the opening end of the vent hole of the downward bucket contacts the lower end of the valve body that opens and closes the valve opening, and the valve body that opens and closes the valve opening is used as the valve opening. The gas that is pushed through and flows from the vent hole through the communication hole hits the valve body that opens and closes the valve opening, and acts as a valve closing force on the valve body that opens and closes the valve opening. Therefore, the valve closing force is increased and no valve leakage occurs.

An embodiment showing a specific example of the above technical means will be described (see FIG. 1).
A lid 3 is attached to the main body 1 via a gastight holding gasket 2 to form a valve casing having a valve chamber 4 therein. An inlet 5 and an outlet 14 on the same axis as the inlet 5 are formed at the top of the main body 1. The inlet 5 extends to the lower side of the valve chamber 4 through the inflow passage 6, and communicates with the valve chamber 4 through the introduction hole 8 of the introduction pipe 7 screwed to the bottom wall of the valve chamber 4. A downward bucket 9 is accommodated in the valve chamber 4. The downward bucket 9 is provided with a vent hole 10 in the upper part and an introduction opening 11 through which the introduction pipe 7 passes and opens in the lower part.

  A valve seat member 13 is screwed to the lid 3 via a gasket 12 for airtightness. The valve seat member 13 is formed with a valve port 15 for communicating the valve chamber 4 with the outlet 14. A fulcrum 16 is provided at the lower end of the valve seat member 13, and one end of the lever 17 is connected to be swingable. A hemispherical valve element 18 that opens and closes the valve port 15 is attached to the fulcrum 16 side of the lever 17 with a snap ring 19. The other end of the lever 17 is loosely coupled to the connecting member 20 fixed to the downward bucket 9. The vent hole 10 of the downward bucket 9 is located directly below the valve body 18 that opens and closes the valve port 15. A communication hole 21 that opens from the lower surface to the side surface is formed in the valve body 18 that opens and closes the valve port 15. When the valve body 18 that opens and closes the valve port 15 closes the valve port 15, the open end of the air vent 10 of the downward bucket 9 contacts the lower end of the valve body 18 that opens and closes the valve port 15 to open and close the valve port 15. The valve body 18 is pressed against the valve port 15, and the gas emitted from the vent hole 10 through the communication hole 21 hits the valve body 18 that opens and closes the valve port 15 and acts as a valve closing force on the valve body 18 that opens and closes the valve port 15. .

  The operation of the downward bucket type steam trap of the above embodiment is as follows. In FIG. 1, steam flows from the inlet 5 through the introduction hole 8 into the downward bucket 9, the downward bucket 9 is lifted by buoyancy, and the valve body 18 closes the valve opening 15 via the lever 17. Is shown. In this state, the opening end of the vent hole 10 of the downward bucket 9 is in contact with the lower end of the valve body 18 that opens and closes the valve port 15, and the valve body 18 that opens and closes the valve port 15 is pressed against the valve port 15. The buoyancy of the bucket 9 acts as a closing force to the valve body 18 that opens and closes the valve port 15, and gas such as steam and air in the downward bucket 9 opens and closes the valve port 15 from the vent hole 10 through the communication hole 21. The contact with the valve body 18 acts as a valve closing force to the valve body 18 that opens and closes the valve port 15. When the condensate flows into the inlet 5 and the supply of steam into the downward bucket 9 stops, the steam in the downward bucket 9 decreases due to cooling condensation and escape from the vent hole 10, and the downward bucket 9 loses buoyancy and descends, the valve body 18 opens the valve port 15 via the lever 17, and the condensate in the valve chamber 4 is discharged from the valve port 15 to the outlet 14. When steam flows into the downward bucket 9 due to the discharge of the condensate, the downward bucket 9 rises again, and the valve body 18 closes the valve port 15 via the lever 17. Such an operation is repeated.

It is sectional drawing of the downward bucket type steam trap of the Example of this invention.

Explanation of symbols

4 Valve chamber 5 Inlet 9 Downward bucket 10 Vent hole 11 Inlet opening 14 Outlet 15 Valve port 17 Lever 18 Valve element 21 Communication hole

Claims (1)

The valve casing forms an inlet, a valve chamber, and an outlet, a valve port that communicates the valve chamber and the outlet is formed in the upper part of the valve chamber, and a downward bucket that has an inlet opening in the lower part and a vent hole in the upper part is formed in the valve chamber. When opening and closing the valve port with a valve body that is accommodated and connected to the downward bucket via a lever, locate the vent hole provided in the upper part of the downward bucket directly below the valve body that opens and closes the valve port, and A communication hole is formed from the lower surface to the side surface of the valve body that opens and closes, and when the valve body that opens and closes the valve port closes the valve port, the open end of the vent hole of the downward bucket contacts the lower end of the valve body that opens and closes the valve port. The valve body that opens and closes the valve port is pressed against the valve port, and the gas emitted from the vent hole through the communication hole hits the valve body that opens and closes the valve port and acts as a valve closing force on the valve body that opens and closes the valve port. A downward bucket type steam trap characterized by

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