JP2009222123A - Steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow periodical cleaning of a discharge passage before blocked with foreign matters. <P>SOLUTION: A float 11 is arranged in a valve chest 4, which is seated on/off a valve seat member 9 to open/close the discharge passage 8. An operation member 16 operable to be moved forward/backward is arranged in the discharge passage 8, and a piston 15 is connected to the operation member 16 to form a pressure chamber 14 on the back face of the piston 15. A communication passage 18 is formed to communicate the valve chest 4 with the pressure chamber 14. An inner and outer valve seat member 20 and a cap member 21 are mounted on a cover 2 to form a variable pressure chamber 22. A jet hole 23 is opened to the center of the inner and outer ring valve seat member 20 on the side of the variable pressure chamber 22 to communicate the valve chest 4 with the variable pressure chamber 22. An annular groove 24 is provided in the outer periphery of the jet hole 23 to form an inner ring valve seat 25 and an outer ring valve seat 26 between the jet hole 23 and the annular groove 24 and on the outer periphery of the annular groove 24, respectively. A discharge hole 27 is opened in the annular groove 24 to communicate the variable pressure chamber 22 with the communication passage 18. A valve disc 28 to be seated on/off the inner and outer ring valve seats 25, 26 is arranged in the variable pressure chamber 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a steam trap that automatically discharges drain generated in a steam piping system by a valve member, and more particularly, to one that can clean foreign matter in a fluid adhering to the inner surface of a discharge passage of a valve seat member on which the valve member is seated. .

  A conventional steam trap capable of cleaning foreign matter in a fluid adhering to the inner surface of a discharge passage of a valve seat member is a valve seat having a discharge passage that forms an inlet, a valve chamber, and an outlet in a valve casing and communicates the valve chamber to the outlet side. A valve member is provided to open and close the discharge passage by seating on and off the valve seat member in the valve chamber, an operation member capable of moving forward and backward is disposed in the discharge passage, and a pressure responsive member is connected to the operation member for pressure. A pressure chamber is formed on the back surface of the response member, a communication passage that connects the valve chamber to the pressure chamber is formed, and a temperature response member that opens and closes the communication passage is provided.

In the conventional steam trap, when the foreign matter adheres to the inner surface of the discharge passage of the valve seat member and the drain cannot be discharged, the temperature responsive member opens the communication passage and advances the operation member by the pressure responsive member to move the valve seat member. It cleans up foreign matter adhering to the inner surface of the discharge passage. That is, the discharge passage is cleaned after the discharge passage is closed with foreign matter.
JP2007-333091

  The problem to be solved is to be able to clean the discharge passage periodically before it is closed by foreign matter.

  The present invention provides a valve seat member having a discharge passage that forms an inlet, a valve chamber, and an outlet in a valve casing, and communicates the valve chamber to the outlet side, and opens and closes the discharge passage by seating on the valve seat member. A valve member is disposed, an operation member capable of advancing and retracting is disposed in the discharge passage, a pressure responsive member is connected to the operation member, a pressure chamber is formed on the back surface of the pressure responsive member, and the valve chamber communicates with the pressure chamber. Forming a communication passage, providing valve means for opening and closing the communication passage, and opening and closing the communication passage by the valve means to drive the pressure responsive member to move the operation member forward and backward to clean foreign matter adhering to the inner surface of the discharge passage The inner and outer ring valve seat members and the cap member are attached to the valve casing to form a variable pressure chamber, and an injection hole is formed in the center of the inner and outer ring valve seat members on the variable pressure chamber side so that the valve chamber and the variable pressure chamber communicate with each other. An annular groove is provided around the outer circumference of the inner ring between the ejection hole and the annular groove. An outer ring valve seat was formed around the outer periphery of the annular groove, a discharge hole was opened from the annular groove to allow the variable pressure chamber to communicate with the communication path, and a valve disk that was attached to and detached from the inner and outer ring valve seats was placed in the variable pressure chamber. It is characterized by.

  The present invention produces an excellent effect that the discharge passage can be periodically cleaned before the discharge passage is closed by foreign matter by opening and closing the communication hole with a valve disk disposed in the variable pressure chamber.

  In the steam trap of the present invention, the inner and outer ring valve seat members and the cap member are attached to the valve casing to form a variable pressure chamber, and an injection hole is formed in the center of the inner and outer ring valve seat members on the variable pressure chamber side to connect the valve chamber and the variable pressure chamber. Communicating, forming an annular groove around the outer periphery of the ejection hole, forming an inner ring valve seat between the ejection hole and the annular groove, forming an outer ring valve seat around the outer periphery of the annular groove, and opening a discharge hole from the annular groove to transform The chamber is connected to the communication path, and a valve disk that is attached to and detached from the inner and outer ring valve seats is disposed in the variable pressure chamber. Therefore, the valve disk arranged in the variable pressure chamber is separated from the inner and outer ring valve seats as the pressure drops due to condensation of steam in the variable pressure chamber, opens the communication path, and advances the operation member by the pressure responsive member to clean. When the steam passes between the valve disc and the inner and outer ring valve seats, the valve disc is seated on the inner and outer ring valve seats, the communication path is closed, and the operating member is moved backward by the pressure responsive member. In this way, by opening and closing the communication hole with the valve disk arranged in the variable pressure chamber, the discharge passage can be periodically cleaned before the discharge passage is closed with foreign matter.

  An embodiment showing a specific example of the above technical means will be described (see FIG. 1). A lid 2 is fastened to the main body 1 with bolts 3 to form a valve casing, and a valve chamber 4 is formed inside. The main body 1 has an inlet 5, an outlet passage 6 and an outlet 7, and the inlet 5 communicates with the upper portion of the valve chamber 4. The inlet 5 and the outlet 7 are formed on the same axis. A valve seat member 9 having a discharge passage 8 is screwed to the lower portion of the valve chamber 4. The valve seat member 9 has a through hole 10 for communicating the discharge passage 8 with the outlet passage 6, and the lower portion of the valve chamber 4 communicates with the outlet 7 from the discharge passage 8 through the through hole 10 and the outlet passage 6. A hollow spherical float 11 that opens and closes the discharge passage 8 by being seated on the valve chamber side end face of the valve seat member 9 is disposed in the valve chamber 4 in a free state. A float seat 12 with which the float 11 abuts at a position where the discharge passage 8 is closed is provided below the float 11.

  A plug 13 is screwed to the main body 1 on the same axis as the valve seat member 9. A piston 15 as a pressure responsive member is accommodated in a pressure chamber 14 formed by the plug 13 so as to be displaceable in the axial direction of the discharge passage 8. An operation member 16 capable of moving back and forth in the discharge passage 8 is fixed to the piston 15. A coil spring 17 that urges the piston 15 toward the plug 13 is disposed between the valve seat member 9 and the piston 15. The upper part of the valve chamber 4 and the pressure chamber 14 are communicated with each other through a communication path 18. A relief hole 19 is opened in the piston 15. The flow passage area of the escape hole 19 is formed smaller than the flow passage area of the communication passage 18. A cap member 21 is screwed to the lid 2 via an inner / outer ring valve seat member 20 to form a variable pressure chamber 22. An injection hole 23 is opened at the center of the inner / outer ring valve seat member 20 on the side of the variable pressure chamber 22 to allow the valve chamber 4 and the variable pressure chamber 22 to communicate with each other. An annular groove 24 is provided on the outer periphery of the ejection hole 23, an inner ring valve seat 25 is formed between the ejection hole 23 and the annular groove 24, and an outer ring valve seat 26 is formed on the outer periphery of the annular groove 24. A discharge hole 27 is opened from the annular groove 24 to allow the variable pressure chamber 22 to communicate with the communication path 18. A valve disk 28 that is attached to and detached from the inner and outer ring valve seats 25 and 26 is disposed in the variable pressure chamber.

  Drain flowing in from the inlet 5 accumulates in the valve chamber 4, and the float 11 rises and falls according to the liquid level and is seated on and off the valve seat member 9 to open and close the discharge passage 8. When the discharge passage 8 is opened, drain in the valve chamber 4 is discharged to the outlet 7 through the discharge passage 8, the through hole 10, and the outlet passage 6, and when the discharge passage 8 is closed, leakage of gas in the valve chamber 4 is prevented. The When the valve disk 28 is separated from the inner and outer ring valve seats 25 and 26 and the communication passage 18 is opened as the pressure drops due to the condensation of steam in the variable pressure chamber 22, the pressure chamber 14 becomes high pressure and the piston 15 moves forward. As a result, the operation member 16 is advanced to clean the inner surface of the discharge passage 8. Then, the drainage is completed and the steam passes between the valve disk 28 and the inner and outer ring valve seats 25 and 26, so that the valve disk 28 is seated on the inner and outer ring valve seats 25 and 26 and the communication path 18 is closed. The pressure chamber 14 is kept at a low pressure, and the piston is retracted, whereby the operating member 16 is retracted.

Sectional drawing of the float type steam trap of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 4 Valve chamber 5 Inlet 7 Outlet 8 Discharge passage 9 Valve seat member 11 Float 14 Pressure chamber 15 Piston 16 Operation member 18 Communication passage 20 Inner / outer ring valve seat member 21 Cap member 22 Transformer chamber 23 Injection hole 24 Annular groove 25 Inner ring valve seat 26 Outer ring valve seat 27 Discharge hole 28 Valve disc

Claims (1)

A valve seat member having a discharge passage that forms an inlet, a valve chamber, and an outlet in the valve casing, and that communicates the valve chamber with the outlet side is provided, and a valve member that opens and closes the discharge passage by being seated in and out of the valve seat member. An operation member that can be moved forward and backward is disposed in the discharge passage, a pressure responsive member is connected to the operation member, a pressure chamber is formed on the back surface of the pressure responsive member, and a communication passage that communicates the valve chamber with the pressure chamber is formed. A valve casing that opens and closes the communication passage, and opens and closes the communication passage by the valve means to drive the pressure responsive member to move the operation member forward and backward to clean foreign matter adhering to the inner surface of the discharge passage. The inner and outer ring valve seat members and the cap member are attached to form a variable pressure chamber, and an injection hole is formed in the center of the inner and outer ring valve seat members on the variable pressure chamber side so that the valve chamber and the variable pressure chamber communicate with each other. An annular groove is provided, and the inner ring valve seat is connected between the ejection hole and the annular groove. An outer ring valve seat is formed on the outer periphery of the groove, a discharge hole is opened from the annular groove to allow the variable pressure chamber to communicate with the communication path, and a valve disk that is attached to and detached from the inner and outer ring valve seats is disposed in the variable pressure chamber. steam trap.

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