JP4879697B2 - steam trap - Google Patents

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 float as a valve member is arranged, an operation member that can be advanced and retracted is arranged in the discharge passage, and foreign matters adhering to the inner surface of the discharge passage of the valve seat member by cleaning the operation member are cleaned. linked to a member, arranged pressure responding member to the pressure chamber communicating with the valve chamber through the communication passage, at low temperatures the communication path with the float at low temperatures does not interfere with the float at high temperatures impede the closing of the exhaust passage A temperature responsive member that is opened and closed at a high temperature is disposed 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.

  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.

In the steam trap of the present invention, the operating member is connected to the pressure responsive member, and the pressure responsive member is disposed in the pressure chamber communicating with the valve chamber via the communication passage, preventing the float from closing the discharge passage at a low temperature, and at a high temperature. A temperature responsive member that does not interfere with the float and closes the communication path at a high temperature and opens at a low temperature is arranged in the valve chamber. It is something to be made. Therefore, if the steam trap has discharged the drain normally, the valve chamber is kept at a high temperature, the temperature responsive member does not interfere with the float, the communication passage is closed, the pressure chamber is kept at a low pressure, and the pressure responsive member is retracted, As a result, the operating member is retracted. If 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 due to heat radiation to the outside , and the temperature responsive member prevents the float from closing the discharge passage and When the pressure chamber is opened and the pressure responsive member moves forward, the operating member is moved forward to clean 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 that urges the piston 15 toward the plug 13 is disposed between the valve seat member 9 and the piston 15. 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 bimetal 20 as a temperature responsive member is disposed in the valve chamber 4. The bimetal 20 is substantially U-shaped, and one end is fixed to the lid 2 with a screw 21. The bimetal 20 is deformed so that the U shape is narrowed at high temperatures and does not interfere with the float 11, and the communication path 18 is closed at the free end on the other end side, and is deformed so that the U shape is expanded at low temperatures, thereby forming the communication path 18. The float 11 is lifted and the discharge passage 8 is opened. 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 does not interfere with the float 11, the communication passage 18 is closed, the pressure chamber 14 is kept at a low pressure, and the piston 15 moves backward. Thus, the operation member 16 is retracted.

When foreign matter adheres to the inner surface of the tip 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 due to heat radiation to the outside , and the bimetal 20 floats through the discharge passage 8. The closing is prevented and the communication path 18 is opened. 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 Discharge passage tip 9 Valve seat member 11 Float 14 Pressure chamber 15 Piston 16 Operation member 18 Communication passage 20 Bimetal

Claims (1)

Forming an inlet and the valve chamber and the outlet in the valve housing, a valve chamber a valve seat member having a discharge passage communicating with the outlet side provided, as a valve member for opening and closing the discharge passage and away seated on the valve seat member in the valve chamber If the operation member that can be moved forward and backward is disposed in the discharge passage and the foreign matter 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, the operation member is connected to the pressure responsive member. places the pressure responding member to the pressure chamber communicating with the valve chamber through the communication passage is closed at a high temperature opens the communication passage at low temperatures with the float at low temperatures does not interfere with the float at high temperatures impede the closing of the exhaust passage A steam trap characterized in that a temperature responsive member is disposed in a 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.

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