JP4879817B2 - Float type steam trap - Google Patents

Description

  The present invention relates to a float type steam trap that automatically discharges drain generated in a steam piping system by floating and descending of a float, and more particularly to a type that can clean foreign matter in a fluid adhering to the inner surface of a discharge passage that opens and closes the float.

  The conventional float trap has an inlet, a valve chamber, and an outlet formed by a valve casing, a discharge passage that connects the valve chamber to the outlet side is formed at the bottom of the valve chamber, and a float that opens and closes the discharge passage is disposed in the valve chamber. Then, an operation member that can be manually advanced and retracted from the outside is disposed in the discharge passage, and foreign matter adhering to the inner surface of the discharge passage due to advancement and retraction of the operation member is cleaned.

The above-mentioned conventional float type trap manually moves the operation member back and forth, so that there is a problem that it takes a hand gap to clean the foreign matter adhering to the inner surface of the discharge passage.
Japanese Utility Model Publication No. 49-36747

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

  The present invention forms an inlet, a valve chamber, and an outlet in a valve casing, forms a discharge passage that communicates the valve chamber with the outlet side at a lower portion of the valve chamber, and arranges a float that opens and closes the discharge passage in the valve chamber. An operation member capable of advancing and retracting in the passage is arranged to clean foreign matter adhering to the inner surface of the discharge passage by the advancement and retraction of the operation member. A pressure responsive member is connected to the operation member and a pressure chamber is provided on the back surface of the pressure responsive member. A communication passage that connects the valve chamber to the pressure chamber is formed at the top of the valve chamber, and a temperature responsive member that opens at a low temperature and closes at a high temperature is disposed at the top of the valve chamber. The pressure responsive member is driven by opening and closing to move the operating member forward at a low temperature and 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 is automatically cleaned. This produces an excellent effect of being able to.

  The float type steam trap of the present invention connects the pressure responsive member to the operation member to form a pressure chamber on the back surface of the pressure responsive member, and forms a communication passage communicating the valve chamber with the pressure chamber at the upper portion of the valve chamber. A temperature responsive member that opens at a low temperature and closes at a high temperature is arranged at the top of the valve chamber, and the pressure responsive member is driven by opening and closing the communication passage by the temperature responsive member to advance the operating member at a low temperature and to retreat at a high temperature. is there. Therefore, if the float steam trap is discharging drain normally, 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 moved back. The member is retracted. When foreign matter adheres to the inner surface of the discharge passage 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 moves forward. The member is advanced to clean the foreign matter adhering to the inner surface of the discharge passage.

  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. An exhaust valve seat 21 having an exhaust passage 20 opened in the upper portion of the valve chamber 4 is screwed with a holding guide 22 interposed therebetween. The upper portion of the valve chamber 4 communicates with the pressure chamber 14 through the exhaust passage 20 and the exhaust outlet passage 23 opened in the lid 2 through the communication passage 18. The temperature responsive member 25 is locked to the holding guide 23 by a spring 24 that is locked to the holding guide 23. The temperature responsive member 25 is a substantially disk-shaped sealed capsule, which is not illustrated, and is formed by filling a thin plate diaphragm and a thermal expansion / contraction liquid inside. The temperature responsive member 25 expands at a high temperature to close the exhaust passage 20 and contracts at a low temperature to open the exhaust passage 20. When the exhaust passage 20 is closed, the pressure in the pressure chamber 14 escapes from the relief hole 19 to the outlet 7 side, so that the pressure chamber 14 becomes low pressure, and the piston 15 is retracted by the biasing force of the coil spring 17 to retract the operation member 16. . When the exhaust passage 20 is opened, 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 advances to advance the operation member 16. .

  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 If the drain is normally discharged, the valve chamber 4 is kept at a high temperature. Therefore, the temperature responsive member 25 closes the exhaust passage 20, the pressure chamber 14 is kept at a low pressure, and the piston 15 moves backward to operate the operation member. 16 is retracted. When foreign matter adheres to the inner surface 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 temperature responsive member 25 opens the exhaust passage 20. When the exhaust passage 20 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. Thereby, the inner surface of the discharge passage 8 of the valve seat member 9 is cleaned at the distal end portion of the operation member 16.

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 Exhaust passage 21 Exhaust valve seat 25 Temperature response member

Claims (1)

The valve casing forms an inlet, a valve chamber, and an outlet. A discharge passage that connects the valve chamber to the outlet side is formed in the lower portion of the valve chamber. A float that opens and closes the discharge passage is disposed in the valve chamber, and moves forward and backward in the discharge passage. In order to clean the foreign matter adhering to the inner surface of the discharge passage by arranging an operable operation member and moving the operation member back and forth, a pressure chamber is formed on the back surface of the pressure response member by connecting the pressure response member to the operation member, A communication passage that connects the valve chamber to the pressure chamber is formed in the upper part of the valve chamber, and a temperature-responsive member that opens at a low temperature and closes at a high temperature is placed in the upper part of the valve chamber. A float type steam trap characterized in that a response member is driven to move the operating member forward at a low temperature and to retract at a high temperature.

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