JP2007333091A - Steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remove foreign matter adhering onto the inner surface of a discharge passage of a valve seat member by advancing/retreating an operation member automatically. <P>SOLUTION: A valve casing is formed from a body 1 and a lid 2. An inlet 5, a valve chamber 4 and an outlet 7 are formed in the valve casing. The valve seat member 9 is mounted on a lower part of the valve chamber 4. The discharge passage 8 communicating the valve chamber 4 with the outlet 7 side is formed on the valve seat member 9. A float 11 as a valve member for opening/closing the discharge passage 8 by being separated from/seated on the valve seat member 9 is arranged in the valve chamber 4. A piston 15 as a pressure responsive member is stored in a pressure chamber 14 formed from the lid 2 and a plug 13, displaceably in the axial direction of the discharge passage 8. The operation member 16 movable forward and backward in the discharge passage 8 is fixed to the piston 15. A bimetal 20 as a temperature responsive member for opening/closing a communicating path 18 is arranged in the valve chamber 4. The bimetal 20 closes the communicating path 18 by being deformed so as to narrow a U-shape at a high temperature time, and opens the communicating path 18 by being deformed so as to expand the U-shape at a low temperature time. <P>COPYRIGHT: (C)2008,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. .

  In the conventional float trap, an inlet, a valve chamber, and an outlet are formed by a valve casing, a valve seat member is attached to a lower portion of the valve chamber, and a discharge passage that communicates the valve chamber to the outlet side is formed in the valve seat member. A float that opens and closes the discharge passage by seating on and off the valve seat member is arranged in the room, and an operation member that can be moved forward and backward from the outside is arranged in the discharge passage. It cleans up foreign matter adhering to the inner surface of the discharge passage.

Since the conventional float type trap manually moves the operating member back and forth, there is a problem that it takes a lot of time to clean the foreign matter adhering to the inner surface of the discharge passage of the valve seat member.
Japanese Utility Model Publication No. 49-36747

  The problem to be solved is to automatically move the operating member back and forth so that foreign matter adhering to the inner surface of the discharge passage of the valve seat member can be cleaned.

  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 arranged, an operation member that can be advanced and retracted is arranged in the discharge passage, and the operation member is connected to the pressure responsive member in order to clean foreign matter adhering to the inner surface of the discharge passage of the valve seat member by the advancement and retraction of the operation member The pressure responsive member is disposed in the pressure chamber that communicates with the valve chamber via the communication passage, the temperature responsive member that closes the communication passage at a high temperature and opens at a low temperature is disposed in the valve chamber, and the temperature responsive member opens and closes the communication passage. The pressure responsive member is driven to advance the operating member at a low temperature and to retract at a high temperature.

  In the present invention, since the pressure responsive member is driven by opening and closing the communication passage by the temperature responsive member and the operation member is advanced at a low temperature and retracted at a high temperature, the foreign matter adhering to the inner surface of the discharge passage of the valve seat member is automatically removed. The effect that it can be cleaned automatically is produced.

  The steam trap of the present invention includes a temperature responsive member that connects an operation member to a pressure responsive member, disposes the pressure responsive member in a pressure chamber that communicates with the valve chamber via a communication passage, closes the communication passage at a high temperature, and opens at a low temperature. It is arranged in the valve chamber, and the pressure responsive member is driven by opening and closing the communication path by the temperature responsive member to advance the operating member at a low temperature and to retract at a high temperature. Therefore, if the steam trap normally discharges the drain, the valve chamber is kept at a high temperature, the temperature responsive member closes the communication path, the pressure chamber is kept at a low pressure, and the pressure responsive member is retracted, thereby Retreating. 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 valve chamber becomes low temperature, the temperature responsive member opens the communication passage, the pressure chamber becomes high pressure, and the pressure responsive member advances, As a result, the operating member is advanced to clean the foreign matter adhering to the inner surface of the discharge passage of the valve seat member.

  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 lid 2 at the bottom of the valve chamber 4. The lid 2 has an outlet passage 10, and the lower portion of the valve chamber 4 communicates from the discharge passage 8 to the outlet 7 through the outlet passages 10 and 6. A hollow spherical float 11 serving as a valve member 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. Two float seats 12 with which the float 11 abuts at the position where the discharge passage 8 is closed are provided below the float 11 on the side facing the front side of the drawing.

  A plug 13 is screwed to the lid 2 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 lid 2 and 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 is disposed between the valve seat member 9 and the piston 15 to urge the piston 15 toward the plug 13. 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. In the valve chamber 4, a bimetal 20 is disposed as a temperature responsive member that opens and closes the communication passage 18 by being seated at the end of the communication passage 18 on the valve chamber 4 side. The bimetal 20 is substantially U-shaped, one end is fixed to the lid 2 with a screw 21, and the free end at the other end opens and closes the communication path 18. The bimetal 20 is deformed so that the U shape is narrowed at a high temperature and closes the communication path 18, and is deformed so that the U shape is expanded at a low temperature to open the communication path 18. When the bimetal 20 closes the communication passage 18, the pressure in the pressure chamber 14 escapes from the hole 19 to the outlet 7 side, so that the pressure chamber 14 becomes low pressure, and the piston 15 moves backward by the urging force of the coil spring 17 to move the operation member 16. Retreat. When the bimetal 20 opens the communication path 18, the pressure in the valve chamber 4 is introduced into the pressure chamber 14, so that the pressure chamber 14 becomes high pressure, and the piston 15 overcomes the urging force of the coil spring 17 and moves forward to move the operating member 16. Move forward.

  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 and the outlet passages 6 and 10, and when the discharge passage 8 is closed, leakage of steam in the valve chamber 4 is prevented. If the drain is normally discharged, the valve chamber 4 is kept at a high temperature. Therefore, the bimetal 20 closes the communication path 18 and the pressure chamber 14 is kept at a low pressure, and the piston 15 moves backward to move the operating member 16. Retreating.

  When foreign matter adheres to the inner surface of the distal end portion 8a of the discharge passage 8 of the valve seat member 9 and the drain cannot be discharged normally, the valve chamber 4 becomes low temperature and the bimetal 20 opens the communication passage 18. When the communication path 18 is opened, the pressure in the valve chamber 4 is introduced into the pressure chamber 14, the pressure chamber 14 becomes high pressure, and the piston 15 advances to advance the operation member 16. As a result, the inner surface of the distal end portion 8 a of the discharge passage 8 of the valve seat member 9 is cleaned by the distal end portion 16 a of the operation member 16.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 4 Valve chamber 5 Inlet 7 Outlet 8 Discharge passage 8a The front-end | tip part of a discharge passage 9 Valve seat member 11 Float 14 Pressure chamber 15 Piston 16 Operation member 18 Communication passage 20 Bimetal

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 advanced and retracted is disposed in the discharge passage, and the foreign material adhering to the inner surface of the discharge passage of the valve seat member is cleaned by the advancement and retraction of the operation member. A pressure responsive member is arranged in a pressure chamber communicating with the valve chamber via a temperature responsive member that closes the communication passage at a high temperature and opens at a low temperature, and opens and closes the communication passage by the temperature responsive member. A steam trap that is driven to advance the operating member at a low temperature and to retract at a high temperature.

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