JP2013024260A - Disk type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a long working life disk type steam trap by preventing foreign substances from entering the periphery of a bimetal.SOLUTION: A variable pressure chamber 3 is formed inside a body 1 having an inlet 4 and an outlet 5 by fixing a lid 2 to the body 1. A jet hole 6 opened at the center of the variable pressure chamber 3 is provided to communicate an inlet 4 with the variable pressure chamber 3. An annular groove 8 opened at the outer circumference of a jet hole 6 is formed. While an inner ring valve seat 9 is formed between the jet hole 6 and the annular groove 8, an outer ring valve seat 10 is formed to the outer circumference of the annular groove 8. A discharge hole 7 is provided from the annular groove 8 to communicate the variable pressure chamber 3 with the outlet 5. A disk-like valve disk 11 which sits on or separates from the inner ring valve seat 9 and the outer ring valve seat 10, is arranged in the variable pressure chamber 3. A guide rod 15 is fit on the top of the valve disk 11, and is brought into contact with a bimetal 19. A foreign substance such as iron rust are less likely to flow into a bimetal chamber 17, to thereby attain a long life disk type steam trap.

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 conventional disc type steam trap has a problem that the low temperature fluid cannot be reliably discharged to the outside when the temperature of the passing fluid is low at the initial rise. In addition, some of the conventional disc type steam traps use a bimetal ring to discharge a low-temperature fluid, and this bimetal ring contains foreign matter such as iron rust, dust or water stains mixed in the fluid. There is a problem that the trap life is shortened.

Therefore, the problem to be solved by the present invention is to provide a disc-type steam trap having a long life by making it difficult for foreign matters such as iron rust to be mixed around the bimetal.

In order to solve the above-described problems, the present invention provides a lid body fixed to a main body having an inlet and an outlet to form a variable pressure chamber therein, and an injection hole opened at the center of the variable pressure chamber is provided. An annular groove that opens to the outer periphery of the ejection hole is formed, 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 circumference of the annular groove. Disposed in the variable pressure chamber is a disc-shaped valve disk that is connected to the outlet of the variable pressure chamber with an outlet hole and is attached to the inner ring valve seat and the outer ring valve seat. When the temperature around the bimetal is low, the upper end of the guide rod is displaced upward by the bimetal when the temperature around the bimetal is low. And forcibly open the screen at the entrance side of the bimetal It is obtained by placing the wood.

According to the present invention, the guide rod and the bimetal are provided on the upper surface of the valve disk via the screen member, so that foreign matters such as iron rust do not easily reach the periphery of the bimetal, and a long-life trap can be obtained. There is an excellent effect.

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 15 is attached to the upper surface of the valve disk 11 integrally with the valve disk 11. A bimetal chamber 17 is formed on the upper portion of the variable pressure chamber 3 by the lid 2 and the plug 16. A retaining ring 18 is fixed to the upper end of the guide rod 15, and the upper end of a bimetal 19 having a substantially C-shaped cross section is brought into contact therewith. The lower end of the bimetal 19 abuts on the upper surface of the screen member 20 attached to the lid 2 with a retaining ring 21. The screen member 20 is formed of a disk-like porous member, and the guide rod 15 is slidably arranged up and down, and foreign matter such as iron rust flowing into the variable pressure chamber 3 is caused in the bimetal chamber 17. Is prevented from entering.

In the state shown in FIG. 1, the bimetal 19 pushes the guide rod 15 upward, the valve disk 11 is opened, and the inlet 4, the variable pressure chamber 3 and the outlet 5 are in communication with each other, and flows in from the inlet 4. The low-temperature fluid can be forcibly discharged to the outlet 5 side. When the temperature of the fluid flowing into the variable pressure chamber 3 from the inlet 4 rises, the upper end portion of the bimetal 19 expands and does not participate in the retaining ring 18, so that a normal disk-type steam trap can be operated. It can be done.

A lower 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 lower guide rod 12 also moves up and down. The guide member 13 is attached to the outer periphery of the lower guide rod 12. The guide member 13 is provided with a hole in the central portion that allows the lower guide rod 12 to slide up and down, and a vertical stop that is integrated with the hole and the shaft between the outer periphery of the guide member 13 and the main body 1. The ring 14 is fixed to the main body 1.

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 fluid from the inlet 4 is discharged to the outlet 5 through the annular groove 8 and the discharge hole 7.

When the low-temperature fluid, that is, the condensate is discharged and the steam flows into the variable pressure chamber 3, the pressure in the variable pressure chamber 3 increases, and high-speed steam flows down the lower surface of the valve disk 11 to reduce the static pressure. As a result, 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. When the valve cycle as described above is repeated, when the valve disk 11 moves in the vertical direction, the lower guide rod 12 attached integrally with the valve disk 11 is guided by the guide member 13, whereby the valve disk By maintaining the horizontal state without tilting 11, the seating surface of the valve disk 11 on the inner and outer ring valve seats 9 and 10 does not wear unevenly.

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 Lower guide rod 13 Guide member 14 Retaining ring 15 Guide rod 17 Bimetal chamber 18 Stop Wheel 19 Bimetal 20 Screen member 21 Retaining ring

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. When a disc-shaped valve disc that is attached to and detached from the inner ring valve seat and the outer ring valve seat is disposed in the transformation chamber, a guide rod is attached to the upper surface of the valve disc and is attached to the valve disc, and the upper end of the guide rod is When the temperature around the bimetal is low due to contact with the bimetal provided on the lid, the valve disc is forcibly opened by displacing the upper end of the guide rod with the bimetal and the screen on the bimetal inlet side. A disk characterized by arranging members Steam trap.

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