JP2009041719A - Downward bucket type steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a downward bucket type steam trap which can clean out foreign matter adhered to a discharging passage inner surface, and does not blow off steam even if installed in a steam piping system having small amount of drain generation. <P>SOLUTION: A valve casing formed by a main body 1 and an upper cover 3 forms an inlet 5, a valve chamber 4, and an outlet 14. A valve seat member 18 is attached to an upper part of the valve chamber 4, and a discharging passage 16 communicating the valve chamber 4 to the outlet 14 side is formed on the valve seat member 18. A downward bucket 22 provided with an introducing opening 26 at a lower part and an air escaping hole 25 at an upper part is disposed in the valve chamber 4, and the discharging passage 16 is opened/closed by floating/lowering the downward bucket 22. An operating member 32 for cleaning out foreign matter adhered to the discharging passage 16 inner surface of the valve seat member 18 is disposed operable for moving forward/backward in an axial direction of the discharging passage 16 from the outside. A passing flow rate between the operating member 32 and the discharging passage 16 is adjusted by the forward/backward moving position of the operating member 32. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a downward bucket type steam trap that automatically discharges drain generated in a steam piping system by the rising and lowering of a downward bucket, and in particular, a fluid attached to the inner surface of a discharge passage of a valve seat member that opens and closes the downward bucket. It relates to things that can clean foreign matter inside.

  The conventional downward bucket type steam trap forms an inlet, a valve chamber, and an outlet with a valve casing, a valve seat member is attached to the upper portion of the valve chamber, and a discharge passage that connects the valve chamber to the outlet side is formed in the valve seat member A downward bucket having an introduction opening in the lower portion and an air vent hole in the upper portion is disposed in the valve chamber, and the discharge passage is opened and closed by the rising and lowering of the downward bucket. In this downward bucket type steam trap, when steam flows into the downward bucket from the inlet, the downward bucket is lifted by buoyancy to close the discharge passage and prevent leakage of steam. When the drain flows from 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. Descent to open the discharge passage and discharge the drain to the outlet. When steam flows into the downward bucket due to drainage, the downward bucket rises again and closes the discharge passage. Such an operation is repeated.

In the conventional downward bucket type steam trap, foreign matter such as dust and scale in the fluid adheres and accumulates on the inner surface of the discharge passage, the discharge passage is gradually narrowed, the discharge flow rate is reduced, and the discharge passage is clogged. There was a problem. Also, if installed in a steam piping system that generates a small amount of drain, the drain level from the lower bucket will drop because the amount of drain that flows from the inlet will drop, and the lower bucket will not be able to float and blow steam. There was a problem that let me go.
JP 2000-28094 A

  Therefore, the technical problem of the present invention is that it is possible to clean the foreign matter adhering to the inner surface of the discharge passage, and the downward bucket type that does not blow off steam even if it is installed in a steam piping system with a small drain generation amount. Is to provide a steam trap.

  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, a valve seat member is attached to the upper portion of the valve chamber, and the valve seat is attached to the valve seat member. Is formed in a valve chamber with a downward bucket having an inlet opening in the lower portion and an air vent hole in the upper portion, and the discharge passage is opened and closed by the rising and lowering of the downward bucket. An operation member that cleans foreign matter adhering to the inner surface of the discharge passage of the seat member is arranged so that it can be advanced and retracted from the outside in the axial direction of the discharge passage, and the passage flow rate between the operation member and the discharge passage is adjusted by the advance and retreat position of the operation member It is characterized by doing.

  According to the present invention, foreign matters attached to the inner surface of the discharge passage of the valve seat member can be cleaned by advancing and retracting the operation member in the axial direction of the discharge passage from the outside. Therefore, an excellent effect is achieved that the discharge flow rate is not reduced and the discharge passage is not clogged. In addition, by adjusting the passage flow rate between the operation member and the discharge passage by adjusting the advance / retreat position of the operation member, the passage flow rate is reduced, so that steam can be blown even if installed in a steam piping system with a small amount of drain generation. This produces an excellent effect.

  In the downward bucket type steam trap of the present invention, an operation member for cleaning foreign matter adhering to the inner surface of the discharge passage of the valve seat member is disposed so as to be able to advance / retreat from the outside in the axial direction of the discharge passage, and is operated according to the advance / retreat position of the operation member. The passage flow rate between the member and the discharge passage is adjusted. Therefore, the foreign material adhering to the inner surface of the discharge passage of the valve seat member can be cleaned by advancing and retracting the operation member in the axial direction of the discharge passage from the outside. In addition, by adjusting the passage flow rate between the operation member and the discharge passage by adjusting the advance / retreat position of the operation member, the passage flow rate is reduced, so that steam can be blown even if installed in a steam piping system with a small amount of drain generation. In addition, the drain can be discharged with almost no vapor leakage.

  An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). The valve casing is formed by a main body 1 and an upper lid 3 fixed to the main body 1 with a fastening means (not shown) such as a bolt through a gasket 2. A valve chamber 4 is formed in the valve casing, and the inlet 5 communicates with the inlet passage 6, the introduction hole 8 of the introduction pipe 7 and the through hole 9. An opening 10 communicating with the inlet passage 6 is provided in the lower portion of the main body 1, and a cylindrical screen 11 for capturing foreign matter is inserted into the inlet passage 6 from the outside. The opening 10 is closed with a plug 12. The outlet 14 communicates with the valve chamber 4 through the outlet passage 15 and the discharge passage 16. The discharge passage 16 is formed by a valve seat member 18 screwed to the upper side of the valve chamber 4. The discharge passage 16 includes a small-diameter front end portion 16a at the end of the valve chamber 4, a tapered portion 16b whose diameter increases toward the downstream downstream of the front end portion 16a, and a large-diameter rear end portion 16c downstream of the tapered portion 16b. Become.

  A downward bucket 22 that opens and closes the discharge passage 16 by being lifted and lowered on the valve chamber side end surface of the valve seat member 18 by being lifted and lowered is accommodated in the valve chamber 4 in a free state. The downward bucket 22 is formed by a spherical shell 23 that is slightly larger than the hemisphere and an annular base 24 fixed to the lower opening edge of the spherical shell 23. An air vent 25 is provided in the upper part of the downward bucket 22, and a fluid introduction opening 26 on the inlet 5 side is provided in the lower part. The introduction pipe 7 is attached by screwing to the bottom wall of the main body 1 so as to protrude inside through the introduction opening 26 of the downward bucket 22. Between the lower portion of the introduction pipe 7 and the main body 1, an inclined wall 27 inclined in an upward gradient toward the discharge passage 16 is fixed. Two bucket seats 28 with which the downward bucket 22 abuts at the position where the discharge passage 16 is closed are provided above the downward bucket 22 on the side facing the front side of the drawing.

  A plug 31 is screwed to the upper lid 2 on the same axis as the valve seat member 18. The operating member 32 is screwed to the plug 31 so as to be able to advance and retract from the outside. The operation member 32 penetrates the plug 31, and the tip end portion 32 a located downstream of the tip end portion 16 a of the discharge passage 16 protrudes into the valve chamber 4 by advance, and the rear end portion is located outside. A packing 33 is disposed between the plug 31 and the operation member 32, and a packing retainer 34 is screwed to the plug 31 to maintain airtightness between the plug 31 and the operation member 32. The outer diameter of the distal end portion 32 a of the operation member 32 is formed to be slightly smaller than the inner diameter of the distal end portion 16 a of the discharge passage 16, and when the operation member 32 is advanced, the distal end portion 32 a of the operation member 32 moves the discharge passage 16. The inner surface of the tip portion 16a is cleaned. A tapered valve member 35 is formed integrally with the operation member 32 behind the distal end portion 32 a of the operation member 32. The valve member 35 of the operating member 32 is seated on the tapered portion 16b of the discharge passage 16 and is opened when the discharge passage 16 is closed and retracted when the discharge passage 16 is moved forward most. The passage flow rate between the distal end portion 32 a of the operation member 32 and the distal end portion 16 a of the discharge passage 16 is adjusted by the advance / retreat position of the operation member 32.

  The operation of the downward bucket type steam trap of the above embodiment is as follows. When steam flows into the downward bucket 22 from the inlet 5 through the inlet passage 6, the introduction hole 8, and the through hole 9, the downward bucket 22 receives buoyancy and rises to the valve chamber side end surface of the valve seat member 18. The exhaust passage 16 is closed by sitting on the head to prevent the leakage of steam. When the drain flows from the inlet 5 and the supply of the steam into the downward bucket 22 stops, the steam in the downward bucket 22 decreases due to cooling condensation and escape from the vent hole 25, and the downward bucket 22. Loses buoyancy and descends to open the discharge passage 16 and discharge the drain to the outlet 14 through the discharge passage 16 and the outlet passage 15. When steam flows into the downward bucket 22 due to drainage, the downward bucket 22 rises again and closes the discharge passage 16. Such an operation is repeated.

  Foreign matter in the fluid is captured by the cylindrical screen 11, but when fine foreign matter that cannot be captured adheres to the inner surface of the distal end portion 16 a of the discharge passage 16 of the valve seat member 18, the operation member 32 is screwed in from the outside. The valve member 35 is seated on the tapered portion 16b of the discharge passage 16 and advances to a position where the discharge passage 16 is closed. Thereby, the inner surface of the distal end portion 16 a of the discharge passage 16 of the valve seat member 18 is cleaned by the distal end portion 32 a of the operation member 32. Then, by adjusting the forward / backward position of the operation member 32, the flow rate between the distal end portion 32a of the operation member 32 and the distal end portion 16a of the discharge passage 16 is adjusted to reduce the flow rate of the drain. Even if it is installed in a few steam piping systems, the steam is not blown off, and the drain can be discharged with almost no steam leaking out.

Sectional drawing of the state which retracted the operation member of the downward bucket type steam trap of this invention last. Sectional drawing of the state which advanced the operation member of the downward bucket type steam trap of this invention a little, and adjusted the passage flow rate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 3 Upper cover 4 Valve chamber 5 Inlet 14 Outlet 16 Exhaust passage 18 Valve seat member 22 Downward bucket 25 Air vent 26 Introduction opening 32 Operation member

Claims (1)

The valve casing forms an inlet, a valve chamber, and an outlet. A valve seat member is attached to the upper portion of the valve chamber, a discharge passage that connects the valve chamber to the outlet side is formed in the valve seat member, and the introduction opening is diverted to the upper portion. A downward bucket provided with pores is disposed in the valve chamber, and the discharge passage is opened and closed by the rising and lowering of the downward bucket, and an operation member for cleaning foreign matter adhering to the inner surface of the discharge passage of the valve seat member is disposed on the shaft of the discharge passage. A downward bucket-type steam trap, which is arranged so as to be capable of advancing and retreating from the outside in a direction and adjusting the flow rate between the operating member and the discharge passage according to the advancing / retreating position of the operating member.

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