JP2004190825A - Orifice type steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an orifice type steam trap allowing to wash a screen without removing a trap from a steam piping system. <P>SOLUTION: A trap casing is formed of an inlet side member 1 and an outlet side member 2. The inlet side member 1 is formed with an inlet 3, and the outlet side member 2 is formed with an outlet 4. A valve ball 7 having a through hole 6 is arranged between the inlet and the outlet freely to rotate. A partition member 15 having an orifice 14 is provided inside the through hole 6. A first screen 16 is fitted inside the through hole 16 on one opening end side of the orifice 14, and a second screen 17 is fitted inside the through hole 6 on the other opening end side thereof. The valve ball 7 is turned at 180 degree to discharge the foreign material caught by the first screen 16 or the second screen 17 through the outlet 4. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an orifice type steam trap that automatically discharges condensed water generated in a steam piping system such as a steam transport pipe or a steam-using device from a small-diameter orifice that is always open to the outside of the system. In particular, the present invention relates to a screen provided with a screen on the inlet side of the orifice.
[0002]
[Prior art]
[Patent Document 1]
JP-A-2001-27389
A conventional orifice type steam trap having a screen is disclosed in, for example, JP-A-2001-27389. What is disclosed herein is that a partition member having an orifice is provided between an inlet and an outlet formed in a trap casing, a screen is provided on the inlet side of the orifice, foreign matter on the inlet side is captured by the screen, and condensate is condensed in the orifice. From the outlet to the exit side.
[0003]
[Problems to be solved by the invention]
In the above-mentioned conventional orifice type steam trap, there was a problem that the trap had to be periodically removed from the steam piping system to clean the screen in order to remove foreign matters caught by the screen. An object of the present invention is to provide an orifice type steam trap which can wash a screen without removing the trap from a steam piping system, focusing on the above-mentioned problems of the prior art.
[0004]
[Means for Solving the Problems]
The technical means of the present invention taken to solve the above technical problem is to dispose a valve ball having a flow hole between an inlet and an outlet formed in a trap casing so as to be rotatable, An orifice-type steam trap, wherein a partition wall member having an orifice is provided on the first orifice, and a first screen is provided in a communication hole on one opening end side of the orifice and a second screen is provided in a communication hole on the other opening end side. It is in.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
The orifice type steam trap of the present invention rotates the valve ball to set the first screen to the inlet side and the second screen to the outlet side, and the second screen to the first screen on the inlet side. It is used by switching to the second state facing the outlet side. In the first state, foreign matter on the inlet side is captured by the first screen, condensate is discharged from the orifice through the second screen to the outlet side, and foreign matter captured by the second screen is removed to the outlet side. In the second state, the foreign matter on the inlet side is captured by the second screen, the condensate is discharged from the orifice through the first screen to the outlet side, and the foreign matter captured by the first screen is removed to the outlet side. In this way, by rotating the valve ball, the screen can be washed without removing the trap from the steam piping system.
[0006]
【Example】
An embodiment showing a specific example of the above technical means will be described (see FIG. 1). The outlet side member 2 is screwed to the inlet side member 1 to form a trap casing. An inlet 3 is formed in the inlet member 1, an outlet 4 coaxial with the inlet 3 is formed in the outlet member 2, and a valve chamber 5 communicating the inlet 3 and the outlet 4 is formed in the trap casing.
[0007]
A valve ball 7 having a flow hole 6 is arranged in the valve chamber 5. The flow hole 6 is formed coaxially with the inlet 3 and the outlet 4. An annular valve seat 8 is arranged on the inlet 3 side of the valve ball 7 and an annular valve seat 9 is arranged on the outlet 4 side. A key groove 10 is provided in the valve ball 7, and a key portion 12 at a lower end of a valve shaft 11 penetrating the main body 1 is engaged. A handle (not shown) is attached to the valve shaft 11 so that the valve ball 7 can rotate. An airtight gasket 13 is interposed between the main body 1 and the valve shaft 11.
[0008]
A partition member 15 having an orifice 14 in the flow hole 6 is provided integrally with the valve ball 7. A first screen 16 for catching foreign matter such as dust in the flow hole 6 on one opening end side of the orifice 14 is attached with a retaining ring, and a first screen 16 for catching foreign matter such as dust in the flow hole 6 on the other open end side. 2 The screen 17 is attached with a retaining ring.
[0009]
The illustrated state is a first state in which the first screen 16 faces the inlet 3 and the second screen 17 faces the outlet 4. Foreign matter flowing from the inlet 3 side is captured by the first screen 16 and the condensate is discharged from the orifice 14 through the second screen 17 to the outlet 4 side. When removing the foreign matter caught by the first screen 16, the valve ball 7 was rotated by 180 degrees from the state shown in the figure to make the second screen 17 face the inlet 3 and the first screen 16 face the outlet 4. Switch to the second state. The foreign matter flowing from the inlet 3 side is captured by the second screen 17 and the condensate is discharged from the orifice 14 through the first screen 16 to the outlet 4 side, and the foreign matter captured by the first screen 16 is directed to the outlet 3 side. Be eliminated. In order to remove foreign matter caught by the second screen 17, the valve ball 7 is rotated by 180 degrees to make the first screen 16 face the inlet 3 side and the second screen 17 faces the outlet 4 side. Switch to state. Foreign matter flowing from the inlet 3 side is captured by the first screen 16 and condensate is discharged from the orifice 14 through the second screen 17 to the outlet 4 side, and foreign matter captured by the second screen 17 is directed to the outlet 3 side. Be eliminated.
[0010]
【The invention's effect】
As described above, the orifice type steam trap according to the present invention rotates the valve ball so that the first screen faces the inlet side and the second screen faces the outlet side, and the second screen faces the inlet side. By switching the first screen to the second state in which the first screen is opposed to the outlet side, foreign substances trapped by the first screen or the second screen can be removed to the outlet side, so that the trap is removed from the steam piping system. There is an excellent effect that the screen can be washed without using.
[Brief description of the drawings]
FIG. 1 is a sectional view of an embodiment of an orifice type steam trap according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inlet side member 2 Outlet side member 3 Inlet 4 Outlet 5 Valve room 6 Flow hole 7 Valve ball 11 Valve shaft 14 Orifice 15 Partition member 16 First screen 17 Second screen

Claims (1)

A valve ball having a flow hole between the inlet and the outlet formed in the trap casing is rotatably disposed, a partition member having an orifice is provided in the flow hole of the valve ball, and a flow hole on one opening end side of the orifice is provided. An orifice type steam trap, wherein a first screen is provided in a flow hole on the other open end side.

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