JP2012193776A - Disc-type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc-type steam trap which does not generate eccentric wear at a valve disc and is long in life.SOLUTION: A pressure-changing chamber 3 is formed in a body 1 having an inlet 4 and an outlet 5 by making a lid body 2 firmly adhere to the body. An injection hole 6 opened in the center of the pressure-changing chamber 3 is formed, the inlet 4 and the pressure-changing chamber 3 are made to communicate with each other, and an annular groove 8 opened at the external periphery of the injection hole 6 is formed. An inner ring valve seat 9 is formed between the injection hole 6 and the annular groove 8, an outer ring valve seat 10 is formed at the external periphery of the annular groove 8, a discharge hole 7 is formed from the annular groove 8, and the pressure-changing chamber 3 and the outlet 5 are made to communicate with each other. A round-plate shaped valve disc 11 which is seated on and separated from the inner ring valve seat 9 and the outer ring valve seat 10 is arranged in the pressure-changing chamber 3. A guide rod 12 is attached to the lower part of the valve disc 11, and a spiral groove 13 is formed at the external periphery of the guide rod. When the valve disc 11 is valve-opened and closed, the valve disc is guided by the injection hole 6, the inclination of the valve disc 11 is prevented, and thus the eccentric wear is not generated.

Description

The present invention relates to a disc type steam trap that automatically discharges condensate as condensed water of steam generated in a steam piping system by opening and closing a valve disc in accordance with a pressure change in a variable pressure chamber.

A conventional disk-type steam trap is disclosed in, for example, Patent Document 1. This is because the lid body is fixed to the main body having an inlet and an outlet to form a variable pressure chamber inside, and an injection hole opening at the center of the variable pressure chamber is provided to connect the inlet and the variable pressure chamber. An annular groove that opens is formed, an inner ring valve seat is formed between the ejection hole and the annular groove, an outer ring valve seat is formed on the outer periphery of the annular groove, a discharge hole is provided from the annular groove, and the variable pressure chamber and the outlet are provided. Communicating with a disc-shaped valve disc that is attached to and detached from the inner ring valve seat and the outer ring valve seat in the variable pressure chamber, a seal ring that slides on the outer peripheral wall of the jet hole is placed in the jet hole, and the seal ring is Even if the valve disk is curved upwardly when the valve is closed, the seal disk slides on the outer peripheral wall of the ejection hole so that the valve disk The outer ring valve seat and the seal ring can be in close contact with each other, and the pressure in the variable pressure chamber decreases to the specified valve opening pressure. Karaben disk is to open the valve unseated from the outer ring valve seat and the seal ring.

JP 2003-28388 A

The above-mentioned conventional disc type steam trap cannot be opened / closed while maintaining a horizontal state when the valve disc opens / closes, and the valve disc is inclined and seated away from the valve seat. There is a problem in that the lower surface of the valve disk is worn away and the life as a trap is shortened.

Therefore, the problem to be solved by the present invention is to provide a disk-type steam trap having a long life without causing uneven wear on the valve disk.

In order to solve the above-mentioned problems, the disc type steam trap of the present invention has a lid body fixed to a main body having an inlet and an outlet to form a variable pressure chamber therein, and an ejection hole opened at the center of the variable pressure chamber is provided. An annular groove is formed in the outer periphery of the ejection hole by connecting the inlet and the variable pressure chamber, and an inner ring valve seat is formed between the ejection hole and the annular groove, and an outer ring valve seat is formed on the outer periphery of the annular groove. In addition, a disk-shaped valve disk that is provided in the variable pressure chamber with a discharge hole from the annular groove to connect the variable pressure chamber and the outlet and that is attached to and detached from the inner ring valve seat and outer ring valve seat is guided to the lower surface of the valve disk A rod is integrally attached to the valve disk, the guide rod is disposed in the ejection hole, and a spiral groove is formed on the surface of the guide rod.

According to the present invention, the guide rod is attached to the lower surface of the valve disc integrally with the valve disc, and a spiral groove is provided on the surface of the guide rod. The disc valve is prevented from tilting by being guided by the ejection hole, and the valve disc can be attached to and detached from the valve seat in a horizontal state, thereby preventing uneven wear of the valve disc and making it a long-life trap. There is an excellent effect of being able to.

It is sectional drawing of the disk type steam trap concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. 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. The main body 1 is provided with a jet hole 6 that opens at the center of the variable pressure chamber 3, and the inlet 4 and the variable pressure chamber 3 are communicated with each other through the jet hole 6. An annular groove 8 is provided on the outer periphery of the ejection hole 6, an annular inner ring valve seat 9 is formed between the ejection hole 6 and the annular groove 8, and an annular ring concentric with the inner ring valve seat 9 is formed on the outer periphery of the annular groove 8. The outer ring valve seat 10 is formed. The lower end of the annular groove 8 communicates with the outlet 5 through the discharge hole 7. A disc-shaped valve disk 11 that opens and closes to the inner ring valve seat 9 and the outer ring valve seat 10 to open and close is disposed in the variable pressure chamber 3.

A guide rod 12 is attached to the lower surface of the valve disk 11 integrally with the valve disk 11. Therefore, if the valve disk 11 moves up and down, the guide rod 12 also moves up and down. A spiral groove 13 is formed on the surface of the guide rod 12. In addition, a communication passage 14 is provided on the surface of the guide rod 12 to communicate the upper and lower sides of the ejection hole 6. The diameter of the ejection hole 6 and the diameter of the guide rod 12 are set to dimensions that allow the guide rod 12 to slide up and down.

The operation of the disc type steam trap will be described. When steam does not stay in the variable pressure chamber 3, the valve disk 11 is separated from the inner ring valve seat 9 and the outer ring valve seat 10 by the fluid pressure on the inlet 4 side acting on the valve disk 11 through the ejection hole 6. Then, the low-temperature condensate from the inlet 4 is discharged to the outlet 5 through the annular groove 8 and the discharge hole 7.

When the condensate is discharged and steam flows into the variable pressure chamber 3, the pressure in the variable pressure chamber 3 rises, and high-speed steam flows down the bottom surface of the valve disk 11 to reduce the static pressure. The valve disk 11 is seated on the inner ring valve seat 9 and the outer ring valve seat 10 and is closed. When the steam in the variable pressure chamber 3 condenses due to heat dissipation or the like and the steam pressure decreases, the valve disk 11 separates from the inner ring valve seat 9 and the outer ring valve seat 10 and opens. In the case of repeating the cycle of the on-off valve as described above, when the valve disk 11 moves in the vertical direction, the guide rod 12 attached integrally with the valve disk 11 is guided by the ejection hole 6, whereby the valve disk 11. By maintaining the horizontal state without tilting, the seating surfaces of the valve disk 11 on the inner and outer ring valve seats 9 and 10 do not wear unevenly. Further, since the spiral groove 13 is formed on the surface of the guide rod 12, the valve disk 11 is rotated by the flow of high-speed steam and condensate, and the seating surface of the valve disk 11 on the inner and outer ring valve seats 9 and 10 is rotated. There is no uneven wear.

The present invention can be used for a disk-type steam trap that automatically discharges condensate generated in a steam piping system.

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Transformer chamber 4 Inlet 5 Outlet 6 Ejection hole 7 Discharge hole 8 Annular groove 9 Inner ring valve seat 10 Outer ring valve seat 11 Valve disk 12 Guide rod 13 Spiral groove 14 Communication path

Claims (1)

A lid is fixed to the main body having an inlet and an outlet to form a variable pressure chamber inside, and an injection hole that opens at the center of the variable pressure chamber is provided so that the inlet and the variable pressure chamber communicate with each other. A groove is provided to form an inner ring valve seat 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 provided from the annular groove, and the variable pressure chamber communicates with the outlet. A disc-shaped valve disk that is attached to and detached from the inner ring valve seat and the outer ring valve seat is arranged in the transformer chamber. A guide rod is attached to the lower surface of the valve disc integrally with the valve disc, and the guide rod is arranged in the ejection hole. In addition, a disk-type steam trap characterized in that a spiral groove is formed on the surface of the guide rod.

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