JP2008020046A - Steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remove foreign matter adhered to the inner surface of a discharge passage of a valve seat member by automatically moving forward and backward an operating member. <P>SOLUTION: A valve casing is formed by a main body 1 and a lid 2. An inlet 5, a valve chamber 4, and an outlet 7 are formed in the valve casing. A valve seat member 9 having the discharge passage 8 connecting the valve chamber 4 to the outlet 7 side is provided. A float as a valve member fitted to and separated from the valve seat member 9 to open and close the discharge passage 8 is disposed within the valve chamber 4. A magnet 5 is fixed to the inner wall of an outlet passage 10 of the lid 2. A plug 13 is screwed coaxially with the valve seat member 9, and a thermosensitive ferrite 16 as a thermosensitive magnetic body is stowed in a storage recessed part 14 of the plug 13 in opposition to the magnet 15 so as to be displaceable in the axial direction of the discharge passage 8. The operating member 17 movable forward and backward in the discharge passage 8 is fixed to the ferrite 16. The ferrite 16 is separated from the magnet 15 at a temperature higher than Curie temperature, and attracted to the magnet 15 at the Curie temperature or lower. <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, and in particular, can clean foreign matter in a fluid adhering to the inner surface of a discharge passage of a valve seat member that opens and closes when the valve member opens and closes. About.

  A conventional steam trap is provided with 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. A valve member that opens and closes the valve and an operation member that can be moved forward and backward from the outside are disposed in the discharge passage. The operation member is moved forward and backward by hand to clean the foreign matter adhering to the inner surface of the discharge passage of the valve seat member. Is.

Since the conventional steam 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. A valve member is arranged, an operation member that can be advanced and retracted is arranged in the discharge passage, and the foreign matter adhering to the inner surface of the discharge passage is cleaned by the advancement and retraction of the operation member. A magnet is fixed downstream of the discharge passage. When the temperature is below the Curie temperature, a temperature-sensitive magnetic body that is attracted to the magnet and away from the magnet when the temperature is above the Curie temperature is placed, and an operation member is connected to the temperature-sensitive magnetic body to operate by the displacement of the temperature-sensitive magnetic body. The member is advanced and retracted.

  According to the present invention, the operation member is advanced and retracted by the displacement of the temperature-sensitive magnetic body, so that an excellent effect that foreign matters attached to the inner surface of the discharge passage of the valve seat member can be automatically cleaned is produced.

  In the steam trap of the present invention, a magnet is fixed downstream of the discharge passage, and a temperature-sensitive magnetic body that is attracted to the magnet when it is lower than the Curie temperature and is separated from the magnet when it is higher than the Curie temperature is disposed. The operation member is connected to the thermal magnetic body, and the operation member is advanced and retracted by the displacement of the temperature-sensitive magnetic body. Therefore, if the steam trap normally discharges the drain, the temperature-sensitive magnetic body is separated from the magnet above the Curie temperature, and 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 temperature-sensitive magnetic body is attracted to the magnet at a temperature equal to or lower than the Curie temperature, and the operation member is advanced to the inner surface of the discharge passage of the valve seat member. Clean any foreign matter that has adhered.

  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 discharge passage 8 includes a small-diameter leading end portion 8a at the end of the valve chamber 4, a tapered portion 8b having a diameter increasing toward the downstream downstream of the leading end portion 8a, and a large-diameter rear end portion 8c downstream of the tapered portion 8b. Become. 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 surface 9a 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 magnet 15 is fixed to the inner wall of the outlet passage 10 of the lid 2 downstream of the discharge passage 8 of the valve seat member 9. The plug 13 is screwed on the same axis as the valve seat member 9. An accommodation recess 14 is formed in the plug 13, and a temperature-sensitive ferrite 16 as a temperature-sensitive magnetic body is received in the accommodation recess 14 so as to be displaceable in the axial direction of the discharge passage 8 so as to face the magnet 15. An operation member 17 capable of moving back and forth in the discharge passage 8 is fixed to the temperature sensitive ferrite 16. Between the valve seat member 9 and the temperature sensitive ferrite 16, a coil spring 18 is disposed as an elastic member that urges the temperature sensitive ferrite 16 in a direction away from the discharge passage 8. The temperature-sensitive ferrite 16 is separated from the magnet 15 when the temperature is equal to or higher than the Curie temperature, and the operating member 16 is retracted by the force of the drainage from the discharge passage 8 and the coil spring 18. The temperature-sensitive ferrite 16 is attracted to the magnet 15 against the force of the coil spring 15 when the temperature is equal to or lower than the Curie temperature, and advances the operation member 17 to clean the foreign matter attached to the inner surface of the discharge passage 8 of the valve seat member 9.

  The drain that flows 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 the front end surface 9 a of 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 discharged normally, the temperature-sensitive ferrite 16 is equal to or higher than the Curie temperature, and the operating member 16 is moved backward away from the magnet 15 by the discharge drain from the discharge passage 8 and the force of the coil spring 18.

  When foreign matter adheres to the inner surface of the distal end 8a of the discharge passage 8 of the valve seat member 9 and the drain cannot be discharged normally, the temperature-sensitive ferrite 16 is below the Curie temperature, and resists the force of the coil spring 15 against the magnet 15. The operation member 17 is moved forward and 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 17 a of the operation member 17.

It is 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 8a The tip part of a discharge passage 9 Valve seat member 11 Float 15 Magnet 16 Temperature sensitive ferrite 17 Operation member 17a Tip part 18 of an operation member Coil spring

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. Arrange the operation member that can move forward and backward in the discharge passage, and clean the foreign matter adhering to the inner surface of the discharge passage by the advancement and retraction of the operation member. When the temperature is lower than the Curie temperature, a temperature-sensitive magnetic body that is attracted to the magnet and away from the magnet when the temperature is higher than the Curie temperature is arranged. A steam trap characterized by that.

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