JP2009144826A - Disc type steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disc type steam trap capable of increasing pressure of a primary side annular groove of an outlet hole, an outlet passage and a communicating hole in a short time, when opening a valve. <P>SOLUTION: A pressure change chamber 6 is formed between a valve seat member 4 and a cover member 5 by installing the cover member 5 via the valve seat member 4 in a body 3 having an inlet 1 and an outlet 2. A valve disc 9 is arranged in the pressure change chamber 6. The valve seat member 4 has an inlet passage 15 opening in the center of the pressure change chamber 6 and communicating from the inlet 1 side, the annular groove 16 opening on the outer periphery of the inlet passage 15, an inner ring valve seat 7 formed between the inlet passage 15 and the annular groove 16, an outer ring valve seat 8 formed on the outer periphery of the annular groove 16, the outlet passage 17 opening in the annular groove 16, the outlet hole 18 opening in the outlet 2, with the fluid passing area larger than the fluid passing area of the outlet passage 17, and the communicating hole 19 communicating the outlet passage 17 with the outlet hole 18, with the fluid passing area smaller than the fluid passing area of the outlet passage 17. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a disc type steam trap that automatically discharges condensate generated in a steam piping system by opening and closing a valve disc in accordance with a pressure change in a variable pressure chamber, that is, a thermodynamic steam chamber. The present invention relates to a valve that can increase the valve closing time until the next valve opening operation occurs.

  A disc type steam trap which attempts to increase the valve closing time is disclosed in Japanese Patent Publication No. 49-11652. This is because a lid member is attached to a main body having an inlet and an outlet via a valve seat member, a variable pressure chamber is formed between the valve seat member and the lid member, a valve disk is disposed in the variable pressure chamber, and the valve seat member is transformed. An inlet passage that opens to the center of the chamber and communicates from the inlet side, an annular groove that opens to the outer periphery of the inlet passage, an inner ring valve seat formed between the inlet passage and the annular groove, and an outer periphery of the annular groove An outer ring valve seat, an outlet passage opening in the annular groove, an outlet hole having a fluid passage area smaller than the fluid passage area of the outlet passage and opening to the outlet, and a fluid passage area larger than the fluid passage area of the outlet passage And a communication hole that communicates with the outlet hole. This disk-type steam trap has an outlet hole having a smaller fluid passage area than the fluid passage area of the outlet passage on the secondary side of the outlet passage. By increasing the pressure in the communication hole and making it easier for the discharged fluid to flow into the variable pressure chamber, and increasing the pressure in the variable pressure chamber and then closing the valve, the pressure in the variable pressure chamber from when the valve is closed until the next valve opening operation occurs is increased. The valve closing time required for the pressure to be reduced to a predetermined pressure is increased.

However, since the above-described disc type steam trap is formed with a communication hole having a fluid passage area larger than the fluid passage area of the outlet passage between the outlet passage and the outlet hole, the primary side of the outlet hole when the valve is opened. It took a long time to increase the pressure in the annular groove, the outlet passage, and the communication hole, and there was a problem that the steam passed through the bottom surface of the valve disk before the pressure inside the transformer chamber was sufficiently increased. .
Japanese Patent Publication No.49-11652

  The problem to be solved is to provide a disc type steam trap that can increase the pressure in the annular groove on the primary side of the outlet hole, the outlet passage, and the communication hole in a short time when the valve is opened.

  The disc-type steam trap of the present invention has a lid member attached to a main body having an inlet and an outlet via a valve seat member to form a variable pressure chamber between the valve seat member and the lid member, and a valve disc is arranged in the variable pressure chamber. A valve seat member that opens to the center of the variable pressure chamber and communicates from the inlet side, an annular groove that opens to the outer periphery of the inlet passage, an inner ring valve seat that is formed between the inlet passage and the annular groove, and an annular groove An outer ring valve seat formed on the outer periphery of the outer ring, an outlet passage opening in the annular groove, an outlet hole having a fluid passage area larger than the fluid passage area of the outlet passage, and a fluid passage area larger than the fluid passage area of the outlet passage. The passage area is small and has a communication hole that communicates the outlet passage and the outlet hole.

  In the present invention, a communication hole having a fluid passage area smaller than the fluid passage area of the outlet passage is formed between the outlet passage and the outlet hole. The pressure in the communication hole can be increased in a short time, and the pressure inside the variable pressure chamber can be raised sufficiently to close the valve, and the valve closing time from the valve closing to the next valve opening operation can be extended. Produces an effect.

  In the disc type steam trap of the present invention, a communication hole having a smaller fluid passage area than the fluid passage area of the outlet passage is formed between the outlet passage and the outlet hole. For this reason, when the valve is opened, the pressure in the annular groove on the primary side of the outlet hole, the outlet passage, and the communication hole is increased in a short time to make it easier for the discharged fluid to flow into the variable pressure chamber. The valve closing time required for the pressure in the variable pressure chamber to be lowered to a predetermined pressure from when the valve is closed to when the next valve opening operation occurs can be increased.

  An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). FIG. 1 is a sectional view of a disc type steam trap according to an embodiment of the present invention, and FIG. 2 is a plan view of the valve seat member of FIG. A lid member 5 is attached to a main body 3 having an inlet 1 and an outlet 2 via a valve seat member 4 with a bolt (not shown) to form a variable pressure chamber 6 between the valve seat member 4 and the lid member 5. A disk-shaped valve disk 9 is arranged in the variable pressure chamber 6 so as to be opened and closed by being seated on and off the inner ring valve seat 7 and the outer ring valve seat 8 described below. An airtight holding gasket 11 is interposed between the upper flange 10 of the valve seat member 4 and the main body 3, and an airtight holding gasket 13 is interposed between the lower flange 12 of the valve seat member 4 and the main body 3. A gasket 14 for maintaining airtightness is interposed between the upper flange 10 of the member 4 and the lid member 5.

  The valve seat member 4 communicates from the inlet 1 side and opens to the center of the variable pressure chamber 6, an annular groove 16 that opens to the outer periphery of the inlet passage 15, and between the inlet passage 15 and the annular groove 16. The formed inner ring valve seat 7, the outer ring valve seat 8 concentrically formed on the outer periphery of the annular groove 16 and in the same plane, the outlet passage 17 opening in the annular groove 16, and the fluid in the outlet passage 17 An outlet hole 18 having a larger fluid passage area than the passage area and opening to the outlet 2 and a communication hole 19 having a fluid passage area smaller than the fluid passage area of the outlet passage 17 and communicating with the outlet passage 17 and the outlet hole 18 are provided. A cylindrical screen 20 is disposed between the inlet 1 and the inlet passage 15 to capture foreign matter such as dust and scale in the fluid.

  The operation of the above embodiment will be described. The valve disc 9 is opened from the inner and outer ring valve seats 7 and 8 by the fluid pressure on the inlet 1 acting on the valve disc 9 via the inlet passage 15, and condensate is communicated with the annular groove 16, the outlet passage 17, and the communication. The gas is discharged to the outlet 2 through the hole 19 and the outlet hole 18. As the condensate is discharged and steam passes between the inner and outer ring valve seats 7 and 8 and the valve disk 9 at a high speed, the pressure between the inner and outer ring valve seats 7 and 8 and the valve disk 9 decreases, By flowing into the variable pressure chamber 6 and increasing the pressure in the variable pressure chamber 6, the valve disk 9 is seated and closed on the inner and outer ring valve seats 7,8. When the steam in the variable pressure chamber 6 condenses due to heat dissipation or the like and the steam pressure decreases, the valve disk 9 opens from the inner and outer ring valve seats 7 and 8. Such an on-off valve cycle is repeated.

  A communication hole 19 having a fluid passage area smaller than the fluid passage area of the outlet passage 17 is formed between the outlet passage 17 and the outlet hole 18, so that the valve disk 9 is separated from the inner and outer ring valve seats 7 and 8. At the time of valve operation, the pressure in the annular groove 16 on the primary side of the outlet hole 18, the outlet passage 17, and the communication hole 19 is increased in a short time so that the discharged fluid can easily flow into the variable pressure chamber 6 and the internal pressure of the variable pressure chamber 6 is sufficiently increased. The valve closing time required for the pressure in the variable pressure chamber to decrease to a predetermined pressure from when the valve is closed to when the next valve opening operation occurs can be increased.

Sectional drawing of the disk type steam trap of the Example of this invention. FIG. 2 is a plan view of the valve seat member of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inlet 2 Outlet 3 Main body 4 Valve seat member 5 Lid member 6 Transformer chamber 7 Inner ring valve seat 8 Outer ring valve seat 9 Valve disk 15 Inlet passage 16 Annular groove 17 Outlet passage 18 Outlet hole 19 Communication hole

Claims (1)

A lid member is attached to the main body having an inlet and an outlet via a valve seat member to form a variable pressure chamber between the valve seat member and the lid member, a valve disk is disposed in the variable pressure chamber, and the valve seat member is the center of the variable pressure chamber. An inlet passage that opens to the inlet side and communicates from the inlet side, an annular groove that opens to the outer periphery of the inlet passage, an inner ring valve seat that is formed between the inlet passage and the annular groove, and an outer ring valve seat that is formed on the outer periphery of the annular groove An outlet passage opening in the annular groove, an outlet hole having a larger fluid passage area than the outlet passage and opening in the outlet, and a fluid passage area smaller than the fluid passage area of the outlet passage. A disc-type steam trap, characterized in that it has a communication hole that communicates with each other.

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