JP2009275848A - Disc type steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disc type steam trap not causing gaps between a valve disc, and the surface of the inner and outer ring valve seats. <P>SOLUTION: A variable pressure chamber 3 is formed by a body 1 and a lid 2, a jet hole 6 is opened in a center in a variable pressure chamber 3 side of the body 1 to communicate an inlet 4 with the variable pressure chamber 3, an annular groove 7 is provided on an outer periphery of the jet hole 6, the inner ring valve seat 8 is formed between the jet hole 6 and the annular groove 7, the outer ring valve seat 9 is formed in an outer periphery of the annular groove 7, a discharge hole 10 is opened from the annular groove 7 to communicate an outlet 5 with the variable pressure chamber 3, a discoidal valve disc 11 carrying out separation and seating with respect to a valve seat face comprising the inner ring valve seat 8 and the outer ring valve seat 9 is disposed in the variable pressure chamber 3, an annular resistance groove 15 is formed on a valve seat face of the inner ring valve seat 8, and an annular resistance groove 16 is formed on a valve seat face of the outer ring valve seat 9. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a disk-type steam trap that automatically discharges condensate generated in a steam piping system by opening and closing a valve disk in response to a pressure change in a variable pressure chamber, that is, a thermodynamic steam chamber, and in particular, a fluid passing therethrough. In the case of condensate, the valve disk is not closed and the valve has a resistance groove that is opened when steam passes.

  A disc type steam trap having a resistance groove is shown in Japanese Patent No. 2741308. This forms a variable pressure chamber inside the main body and the lid, opens an injection hole in the center of the main body on the variable pressure chamber side, and connects the inlet and the variable pressure chamber, and provides an annular groove on the outer periphery of the injection hole, An inner ring valve seat is formed between the ejection hole and the annular groove, an outer ring valve seat is formed around the outer periphery of the annular groove, a discharge hole is formed from the annular groove, and the variable pressure chamber is communicated with the outlet. From the inner ring valve seat and the outer ring valve seat, A disk-shaped valve disk that is separated from and seated on the valve seat surface is disposed in the variable pressure chamber, and a resistance groove is formed on the bottom wall of the annular groove.

The above-mentioned disc type steam trap increases the frictional resistance of the fluid passing through the resistance groove formed on the bottom wall of the annular groove, and the condensate does not close the valve disc, but the steam passes. It will be closed. However, it is difficult for the above-described disc type steam trap to contact the valve disc and the valve seat surfaces of the inner ring valve seat and the outer ring valve seat without any gaps. If there is a gap between the valve disc and the steam on the inlet side, there will be a problem of leakage. There was a problem of repeating the on-off valve.
Patent No. 2741308

  The problem to be solved is to provide a disc type steam trap that does not create a gap between the valve disc and the valve seat surfaces of the inner ring valve seat and the outer ring valve seat.

  The disc type steam trap of the present invention forms a variable pressure chamber inside the main body and the lid, opens an injection hole in the center of the main body on the variable pressure chamber side, and connects the inlet and the variable pressure chamber, around the outer periphery of the discharge hole. An annular groove is provided, an inner ring valve seat is formed between the ejection hole and the annular groove, an outer ring valve seat is formed around the outer periphery of the annular groove, a discharge hole is opened from the annular groove, and the variable pressure chamber is connected to the outlet. A disc-shaped valve disk that is attached to and detached from the valve seat surface consisting of a seat and an outer ring valve seat is disposed in the variable pressure chamber, and annular resistance grooves are formed on the valve seat surfaces of the inner ring valve seat and the outer ring valve seat, respectively. It is characterized by.

  The present invention provides a water seal between the valve disc and the valve seat surfaces of the inner ring valve seat and the outer ring valve seat by forming annular resistance grooves on the valve seat surfaces of the inner ring valve seat and the outer ring valve seat, Since there is no gap between the valve disk and the valve seat surfaces of the inner ring valve seat and the outer ring valve seat, an excellent effect of preventing steam leakage is produced.

  The disc type steam trap of the present invention is formed by forming annular resistance grooves on the valve seat surfaces of the inner ring valve seat and the outer ring valve seat, respectively. For this reason, the annular resistance grooves formed on the valve seat surfaces of the inner and outer ring valve seats increase the frictional resistance of the fluid passing therethrough, and the steam does not close the condensate and the steam passes. To close the valve. The annular resistance groove formed on the valve seat surface of the inner ring valve seat provides a water seal between the valve disc and the valve seat surface of the inner ring valve seat, and between the valve disc and the valve seat surface of the inner ring valve seat. There will be no gaps. In addition, an annular resistance groove formed on the valve seat surface of the outer ring valve seat provides a water seal between the valve disc and the valve seat surface of the outer ring valve seat, and between the valve disc and the valve seat surface of the outer ring valve seat. There will be no gaps.

  An embodiment showing a specific example of the above technical means will be described (see FIG. 1). A lid 2 is screwed to the main body 1 to form a variable pressure chamber 3 therein. An inlet 4 and an outlet 5 are formed on the main body 1 on substantially the same axis. An injection hole 6 is opened in the center of the main body 1 to connect the inlet 4 and the variable pressure chamber 3. An annular groove 7 is provided on the outer periphery of the ejection hole 6, an annular inner ring valve seat 8 is formed between the ejection hole 6 and the annular groove 7, and an annular outer ring valve seat 9 is formed on the outer periphery of the annular groove 7. The inner ring valve seat 8 and the outer ring valve seat 9 are concentric and formed in the same plane. A discharge hole 10 is opened from the annular groove 7 to allow the variable pressure chamber 3 and the outlet 5 to communicate with each other.

  A disc-shaped valve disk 11 is disposed in the variable pressure chamber 3 in a free state. The valve disk 11 is seated on the valve seat surface on the upper surface of the inner ring valve seat 8 and the outer ring valve seat 9 to perform an on-off valve. A conical inclined surface portion 12 is formed on the outer periphery of the outer ring valve seat 9, a bimetallic ring 13 with ends is disposed, and an annular plate 14 is disposed between the bimetallic ring 13 and the valve disk 11.

  An annular resistance groove 15 is formed on the valve seat surface of the inner ring valve seat 8, and an annular resistance groove 16 is formed on the valve seat surface of the outer ring valve seat 9. The annular resistance groove 15 formed on the valve seat surface of the inner ring valve seat 8 and the annular resistance groove 16 formed on the valve seat surface of the outer ring valve seat 9 increase the frictional resistance of the fluid passing therethrough, thereby condensing water. Then, the valve disc 11 is not closed, but is closed when steam passes. An annular resistance groove 15 formed on the valve seat surface of the inner ring valve seat 8 provides a water seal between the valve disk 11 and the valve seat surface of the inner ring valve seat 8, and is formed on the valve seat surface of the outer ring valve seat 9. The formed annular resistance groove 16 provides a water seal between the valve disk 11 and the valve seat surface of the outer ring valve seat 9.

  The operation of the above embodiment will be described. When the inside of the variable pressure chamber 3 is at a low temperature, the bimetal ring 13 contracts and moves up the inclined surface portion 12, lifts the valve disk 11 via the annular plate 14, and the valve seat surfaces of the inner ring valve seat 8 and the outer ring valve seat 9. The low-temperature condensate and air are discharged from the outlet passage 10 to the outlet 5. When the high-temperature condensate flows in, the bimetal ring 13 expands and moves down the slope portion 12, and the annular plate 14 moves down accordingly. The valve disk 11 maintains a seat-separated valve open state by the fluid pressure on the inlet 2 side acting on the valve disk 9 through the ejection hole 6, and discharges high-temperature condensate from the outlet passage 10 to the outlet 5. The high-temperature condensate is discharged and steam passes between the valve disc 11 and the valve seat surfaces of the inner ring valve seat 8 and the outer ring valve seat 9 at a high speed, whereby the valve disc 11, the inner ring valve seat 8 and the outer ring valve seat 9. The pressure between the valve seat surface decreases and the pressure in the variable pressure chamber 4 rises due to the steam flowing into the variable pressure chamber 4, so that the valve disk 11 becomes the valve seat of the inner ring valve seat 8 and the outer ring valve seat 9. Close the seat on the surface. When the steam in the variable pressure chamber 3 is condensed due to heat radiation or the like and the steam pressure decreases, the valve disk 11 is opened from the valve seat surfaces of the inner ring valve seat 8 and the outer ring valve seat 9.

Sectional drawing of the disk type steam trap of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Transformer chamber 4 Inlet 5 Outlet 6 Ejection hole 7 Annular groove 8 Inner ring valve seat 9 Outer ring valve seat 10 Discharge hole 11 Valve disk 12 Slope 13 Bimetal ring 14 Annular plate 15 Resistance groove 16 Resistance groove

Claims (1)

The main body and the lid form a variable pressure chamber inside, and an injection hole is formed in the center of the main body on the variable pressure chamber side so that the inlet and the variable pressure chamber communicate with each other, and an annular groove is provided on the outer periphery of the discharge hole. An inner ring valve seat is formed between the annular grooves, an outer ring valve seat is formed around the outer periphery of the annular groove, a discharge hole is opened from the annular groove, and the variable pressure chamber communicates with the outlet. A disk-type steam trap characterized in that a disc-shaped valve disk that is seated on and off the surface is disposed in a variable pressure chamber, and annular resistance grooves are formed on the valve seat surfaces of the inner ring valve seat and the outer ring valve seat, respectively.

Images