JP4879684B2 - Float type drain trap - Google Patents

Description

  The present invention relates to a float-type drain trap that automatically discharges steam, compressed air, or drain generated in a gas piping system by floating up and down of the float, and in particular, removes foreign matters in the fluid adhering to the inner surface of the discharge passage where the float opens and closes. It relates to things that can be cleaned.

  A conventional float drain trap 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 the bottom of the valve chamber, and a float that opens and closes the discharge passage in the valve chamber. An operation member that can be manually moved forward / backward from the outside is disposed in the discharge passage, and foreign matter adhering to the inner surface of the discharge passage due to advance / retreat of the operation member is cleaned.

Since the conventional float drain trap manually moves the operating member back and forth, 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 communication passage that communicates the valve chamber with the pressure chamber is formed in the upper portion of the valve chamber, and the valve member that opens and closes the communication passage is urged in the valve closing direction by an elastic member, and the valve is floated and floated. The operation member is advanced by opening the member.

  Since the present invention automatically opens and closes the valve member that opens and closes the communication passage by the float and moves the operation member forward and backward, it is possible to automatically clean the foreign matter adhering to the inner surface of the discharge passage. Produces an effect.

The float drain trap of the present invention has a pressure responsive member connected to the operation member to form a pressure chamber on the back surface of the pressure responsive member, and a communication passage that connects the valve chamber to the pressure chamber at the upper portion of the valve chamber. A valve member that opens and closes the communication path is arranged by being urged in the valve closing direction by an elastic member, and the operation member is advanced by opening the valve member with a float that floats. Therefore, if the float drain trap normally discharges the drain, the liquid level in the valve chamber is kept relatively low, the valve member closes the communication path by the urging force of the elastic member, and the pressure chamber is kept at a low pressure. Thus, the pressure responsive member is retracted, and the operation member is retracted. When foreign matter adheres to the inner surface of the discharge passage and the drain cannot be discharged, the liquid level in the valve chamber rises higher than normal and the valve member is opened by the float and is introduced through the communication passage. Due to the pressure on the valve chamber side, the pressure chamber becomes high pressure and the pressure responsive member moves forward, whereby the operating member moves forward and cleans 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. A valve seat member 21 having a discharge port 20 that communicates the valve chamber 4 with the communication passage 18 side is screwed to the upper portion of the valve chamber 4. A valve member 22 that opens and closes the discharge port 20 is disposed on the communication passage 18 side of the discharge port 20. The guide rod 23 is fixed to the upper surface of the valve member 22, the connecting rod 24 is fixed to the lower surface of the valve member 22, and the float receiver 25 is fixed to the lower end of the connecting rod 24. The upper part of the guide rod 23 slides up and down in a guide hole 27 of a plug 26 screwed to the lid 2. A coil spring 28 as an elastic member is disposed around the guide rod 23 between the valve member 22 and the plug 26 to urge the valve member 22 in the valve closing direction. If the liquid level in the valve chamber 4 is relatively low, the valve member 22 closes the discharge port 20 by the biasing force of the coil spring 28 and closes the communication passage 18, the pressure chamber 14 is maintained at a low pressure, and the piston 15 moves backward. As a result, the operation member 16 is retracted. When the liquid level in the valve chamber 4 reaches a high level, the valve member 22 is opened by the float 11, and the pressure chamber 14 becomes high pressure by the pressure on the valve chamber 4 side introduced through the communication path 18, and the piston 15 moves forward. As a result, the operation member 16 moves 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, 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 drainage is normally discharged, the liquid level in the valve chamber 4 is kept relatively low, the valve member 22 closes the discharge port 20 by the biasing force of the coil spring 28, closes the communication passage 18, and the pressure chamber 14 is low pressure. The piston 15 is retracted while being maintained at this position, whereby the operating member 16 is retracted. When foreign matter adheres to the inner surface of the discharge passage 8 and the drain cannot be discharged, the liquid level in the valve chamber 4 rises and the valve member 22 is opened by the float 11 and introduced through the communication passage 18. Due to the pressure on the valve chamber 4 side, the pressure chamber 14 becomes high pressure and the piston 15 moves forward. As a result, the operating member 16 moves forward and cleans foreign matter adhering to the inner surface of the discharge passage 8.

Sectional drawing of the float type drain 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 22 Valve member 28 Coil spring

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 valve member that opens and closes the communication passage is urged in the valve closing direction by an elastic member, and the valve member is opened by the float that floats A float type drain trap characterized in that the operating member is moved forward by caulking.

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