JP6022198B2 - Free float drain trap - Google Patents

Description

The present invention relates to a free-float drain trap that automatically discharges drainage generated in steam, compressed air, and a gas piping system by floating up and down of the float.

A conventional free float drain trap is disclosed in, for example, Patent Document 1. This is a trap casing that forms an inlet, a trap chamber, and an outlet, a drain valve hole that communicates the trap chamber and the outlet is provided in the lower part of the trap chamber, and a float that opens and closes the drain valve hole is disposed in the trap chamber. A cylindrical screen is arranged in the upper part of the trap chamber, and an inverted saddle-shaped float cover having a through hole provided on the inside of the screen is provided on the inlet side. The float cover is prevented from rotating by being fitted into a groove provided in the.

JP 54-49623 A

The conventional free float drain trap described above is configured such that when the protrusion of the float cover is fitted in the groove provided in the trap casing and the protrusion is biased toward the inlet side, the protrusion is more trapped on the inlet side than the groove provided in the trap casing. In order to hit the casing, there was a problem that the protrusion could not be fitted into the groove provided in the trap casing.

Therefore, the problem to be solved by the present invention is to provide a free float type drain trap in which a protrusion can be easily fitted in a groove provided in a trap casing.

In order to solve the above problems, the free float drain trap of the present invention forms an inlet, a trap chamber, and an outlet in the trap casing, and a drain valve hole that communicates the trap chamber and the outlet is provided in the lower portion of the trap chamber. A float that opens and closes the drain valve hole is arranged in the trap chamber, a cylindrical screen is arranged in the upper part of the trap chamber, and a reverse bowl-like shape having a through hole provided on the inner side of the cylindrical screen and biased toward the inlet side In the case where the float cover is arranged, the screen and the float cover are fixed, and a protrusion with the lower end bent inward is fixed to the lower end of the screen, and the protrusion is fitted into a groove provided in the trap casing to rotate the float cover. It is characterized by prevention.

According to the present invention, the screen and the float cover are fixed together, and the protrusion with the lower end bent inward is fixed to the lower end of the screen, and the protrusion is fitted into the groove provided in the trap casing to prevent the float cover from rotating. Thus, even if the protrusion is biased toward the inlet when the protrusion is fitted into the groove provided in the trap casing, the lower end of the protrusion does not hit the trap casing on the inlet side of the groove of the trap casing, and the protrusion is then There is an effect that it can be fitted into a groove provided in the trap casing while being displaced to the side opposite to the side.

It is sectional drawing of the free-float type drain trap concerning embodiment of this invention. It is a top view of the float cover of FIG. It is a top view of the main body of FIG.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3. A lid member 2 is fastened to the main body 1 with bolts 3 to form a trap casing. The inside of the trap casing is separated by a partition wall 4 into a trap chamber 6 communicating with the inlet 5 and an outlet passage 8 communicating with the outlet 7. The inlet 5 and the outlet 7 are formed on the same axis. The inlet 5 opens at the top of the trap chamber 6. A cylindrical screen 9 is disposed above the trap chamber 6, and an inverted saddle-shaped float cover 12 is disposed inside the cylindrical screen 9. The screen 9 and the float cover 12 are fixed by welding. The float cover 12 has a through hole 10 provided to be biased toward the inlet 5 and a vent hole 11 provided at the center. A pin having a lower end bent inward is fixed to the lower end of the inner surface of the screen 9 by welding to form a projection 13. By fitting the protrusions 13 into the grooves 18 provided in the main body 1, the float cover 10 is prevented from rotating.

A valve seat 14 is inserted through the outlet passage 8 and the partition wall 4 from the lower opening of the side wall of the main body 1 and the tip protrudes into the trap chamber 6. The valve seat 14 has a drain valve hole 16 penetrating in the center in the axial direction and a branch hole 17 branched from the drain valve hole 16 toward the outlet 7. A hollow spherical float 19 is disposed in the trap chamber 6 in a free state. The float 19 rises and falls according to the liquid level in the trap chamber 6, and opens and closes the drain valve hole 16 on its outer surface. A float seat 20 is formed on the bottom wall of the main body 1. The float seat 20 holds the float 19 at a position where the float 13 closes the drain valve hole 16. An exhaust valve seat 22 having an exhaust valve hole 21 formed in the lid member 2 is screwed with a holding guide 23 interposed therebetween. 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 exhaust valve hole 21 communicates with the outlet passage 8 through an exhaust passage 26 formed in the lid member 2.

The operation of the free float steam trap is as follows. Steam, condensate, and air flow into the trap chamber 6 from the inlet 5, and steam and air separate and accumulate in the upper part and condensate in the lower part. When the temperature in the trap chamber 6 is high, the temperature responsive member 25 expands and closes the exhaust valve hole 21. When the temperature in the trap chamber 6 decreases, the temperature responsive member 25 contracts to open the exhaust valve hole 21, and the condensate and air in the trap chamber 6 are discharged from the exhaust valve hole 21 through the exhaust passage 26 and the outlet passage 8. To discharge.

When the liquid level in the trap chamber 6 rises, the float 19 rises and opens the drain valve hole 16, and condensate in the trap chamber 6 is discharged from the drain valve hole 16 to the outlet 6 through the branch hole 17 and the outlet passage 8. . When the liquid level in the trap chamber 6 decreases due to the discharge of condensate, the float 19 descends and directly closes the drain valve hole 16 on the outer surface.

  INDUSTRIAL APPLICABILITY The present invention can be used for a free float drain trap that automatically discharges steam, compressed air, or drain generated in a gas piping system by floating up and down of the float.

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid member 5 Inlet 6 Trap chamber 7 Outlet 8 Outlet passage 9 Screen 10 Through-hole 12 Float cover 13 Protrusion 14 Valve seat 16 Drain valve hole 18 Groove 19 Float

Claims (1)

The trap casing forms an inlet, a trap chamber, and an outlet. A drain valve hole that connects the trap chamber and the outlet is provided in the lower part of the trap chamber. A float that opens and closes the drain valve hole is arranged in the trap chamber. A cylindrical screen is disposed, and an inverted saddle-shaped float cover having a through hole provided on the inner side of the cylindrical screen is provided on the inlet side. The screen and the float cover are fixed to each other. lower end is secured to the lower end of the projection which is bent inwardly screenshot, projection is characterized in that it is prevented the rotation of the float cover by being rarely write fitted in a groove provided in the trap casing Free float drain trap.

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