JP2009097577A - Lever float type drain trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lever float type drain trap capable of preventing damage of a float. <P>SOLUTION: A casing having a valve chamber 6 inside is constituted by fastening a cover body 4 to a body 3 having an inlet 1 and an outlet 2. A first valve port 7 and a second valve port 8, connecting the valve chamber 6 with the outlet 2, are formed in a lower part of the valve chamber 6. A lever 13 is coupled to a rocking shaft 12 rotatably supported in a support hole 11 in the valve chamber 6. A float 14 floating and lowering in response to a liquid level in the valve chamber 6 is coupled to the lever 13, and a first valve element 20 and a second valve element 21, opening and closing the first valve port 7 and the second valve port 8, are coupled to the lever 13. The rocking shaft 12 is formed in a triangle cross sectional shape, and one vertex of the triangle is coupled to the lever 13 toward the center of the float 14. In the support hole 11, an upper stopper surface 22 is formd on which the upper surface of the rocking shaft 12 abuts when the lever 13 is further rotated in the valve closing direction from a position for closing the first valve port 7 and the second valve port 8 by the first valve element 20 and the second valve element 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lever float drain trap that automatically discharges drain generated in a steam piping system, compressed air piping system, and gas piping system using a float.

  The conventional lever float drain trap forms an inlet, a valve chamber, and an outlet in a casing, and a valve port that communicates the valve chamber and the outlet is formed in the lower portion of the valve chamber and can be rotated in a support hole provided in the valve chamber. The lever is connected to the swing shaft supported by the valve, the float that rises and falls according to the liquid level in the valve chamber is connected to the lever, and the valve body that opens and closes the valve port is connected to the lever. Drain is automatically discharged by rotating the lever together with the swing shaft with a float that rises and falls according to the position, and opening and closing the valve port with the valve body.

In the above-mentioned conventional lever float drain trap, when a water hammer or the like occurs in the piping system and the pressure or liquid level in the valve chamber fluctuates rapidly, the lever closes further from the position where the valve element closes the valve port. Rotating in the direction, the float collided with the bottom wall of the valve chamber and was damaged.
JP-A-2005-36901

  The problem to be solved is to provide a lever float drain trap that can prevent float damage.

  In the present invention, an inlet, a valve chamber, and an outlet are formed by a casing, a valve port that communicates the valve chamber and the outlet is formed in a lower portion of the valve chamber, and the rocker is rotatably supported by a support hole provided in the valve chamber. A lever is connected to the dynamic shaft, a float that rises and falls according to the liquid level in the valve chamber is connected to the lever, and a valve body that opens and closes the valve port is connected to the lever. The top of the triangle is connected to the lever with one apex of the triangle facing the center of the float. It is formed in the support hole.

  In the present invention, the rocking shaft is formed in a cross-sectional triangle, and one of the triangles is connected to the lever with the top of the triangle directed toward the center of the float. Since the upper stopper surface with which the upper surface of the swing shaft abuts is formed in the support hole, the upper surface of the swing shaft contacts the upper stopper surface of the support hole before the float collides with the valve chamber bottom wall. The float can be prevented from colliding with the bottom wall of the valve chamber, and the float can be prevented from being damaged.

  In the present invention, the rocking shaft is formed in a cross-sectional triangle, one vertex of the triangle is connected to the lever toward the center of the float, and the lever further rotates in the valve closing direction from the position where the valve body closes the valve port. In some cases, the upper stopper surface with which the upper surface of the swing shaft abuts is formed in the support hole. Therefore, the upper surface of the swing shaft abuts the upper stopper surface of the support hole before the float collides with the valve chamber bottom wall, so that the float can be prevented from colliding with the valve chamber bottom wall, and the float can be damaged. Can be prevented.

  An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). The lever float type drain trap of the present invention constitutes a casing having a valve chamber 6 inside by fastening a lid 4 with a bolt 5 to a main body 3 having an inlet 1 and an outlet 2. A valve seat member 9 having a first valve port 7 and a second valve port 8 communicating with the valve chamber 6 and the outlet 2 is attached to a main body 3 below the valve chamber 6 with a screw (not shown). The inlet 1 opens to the lower part of the valve chamber 6, and the outlet 2 opens to the lower part of the valve chamber 6 through the first valve port 7 and the second valve port 8.

  The swing shaft 12 is rotatably supported in a support hole 11 of a support member 10 attached to the valve seat member 9 with a screw (not shown). The right end portion of the lever 13 is fitted and connected to the rocking shaft 12 so as to rotate with the rotation of the rocking shaft 12. A hollow spherical float 14 that rises and falls according to the liquid level in the valve chamber 6 is connected to the left end of the lever 13. The swing shaft 12 has a triangular cross section and is connected to the lever 13 with one vertex of the triangle facing the center of the float 14. A connecting shaft 15 parallel to the swing shaft 12 is supported on the right end of the lever 13, and the upper portion of the connecting rod 16 is rotatably connected to the connecting shaft 15. The lower portion of the connecting rod 16 is rotatably connected to a valve shaft 19 parallel to the swing shaft 12 supported on the upper end portion of the valve rod 18 of the valve body 17.

  The valve body 17 includes a first valve body 20 that opens and closes the first valve port 7 from the lower outlet 2 side, a second valve body 21 that opens and closes the second valve port 8 from the lower valve chamber 6 side, and a first valve It comprises a valve rod 18 that connects the body 18 and the second valve body 19. Upper stopper surface with which the upper surface of the swing shaft 12 contacts when the lever 13 further rotates in the valve closing direction from the position where the first valve body 20 and the second valve body 21 close the first valve port 7 and the second valve port 8. 22 is formed in the support hole 11, and when the lever 13 further rotates in the valve closing direction from the position where the first valve body 20 and the second valve body 21 fully open the first valve port 7 and the second valve port 8, A lower stopper surface 23 with which the lower surface of the moving shaft 12 abuts is formed in the support hole 11.

  When the liquid level in the valve chamber 6 is low, the float 14 descends as shown in FIG. 1, and the first valve body 20 and the second valve body 21 close the first valve port 7 and the second valve port 8. Yes. At this time, the upper surface of the swing shaft 12 is not in contact with the upper stopper surface 22 of the support hole 11. When a water hammer or the like is generated in the piping system and the pressure or liquid level in the valve chamber 6 changes suddenly and the lever 13 further rotates in the valve closing direction, the float 14 shakes before contacting the bottom wall of the valve chamber 6. The upper surface of the moving shaft 12 contacts the upper stopper surface 22 of the support hole 11 to prevent the float 14 from being damaged. When the liquid level in the valve chamber 6 rises due to the drain flowing from the inlet 1, the float 14 moves upward and the lever 13 rotates around the swing shaft 12 in the clockwise direction. Due to the rotation of the lever 13, the valve body 17 moves downward via the connecting rod 16, and the first valve body 20 and the second valve body 21 open the first valve port 7 and the second valve port 8. Thereby, the drain of the valve chamber 6 is discharged from the outlet 2. As shown in FIG. 2, when the first valve body 20 and the second valve body 21 fully open the first valve port 7 and the second valve port 8, the lower surface of the rocking shaft 12 faces the lower stopper surface 23 of the support hole 11. There is no contact. When a water hammer or the like is generated in the piping system and the pressure or liquid level in the valve chamber 6 changes suddenly and the lever 13 further rotates in the valve opening direction, the float 14 shakes before contacting the top wall of the valve chamber 6. The lower surface of the moving shaft 12 contacts the lower stopper surface 23 of the support hole 11 to prevent the float 14 from being damaged.

  When the liquid level in the valve chamber 6 decreases due to the drainage, the float 14 moves downward and the lever 13 rotates counterclockwise around the swing shaft 12. Due to the rotation of the lever 13, the valve body 17 moves upward via the connecting rod 16, and the first valve body 18 and the second valve body 19 close the first valve port 7 and the second valve port 8. This prevents gas leakage.

Sectional drawing at the time of valve closing of the lever float type drain trap of this invention. Sectional drawing at the time of fully opening of the lever float type drain trap of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inlet 2 Outlet 3 Main body 4 Cover body 6 Valve chamber 7 1st valve port 8 2nd valve port 10 Support member 11 Support hole 12 Oscillating shaft 13 Lever 14 Float 17 Valve body 20 1st valve body 21 2nd valve body 22 Upper stopper surface 23 Lower stopper surface

Claims (1)

The casing forms an inlet, a valve chamber, and an outlet. A valve port that communicates the valve chamber and the outlet is formed in the lower portion of the valve chamber. The lever is pivotally supported by a support hole provided in the valve chamber. The float that rises and falls according to the liquid level in the valve chamber is connected to the lever, and the valve body that opens and closes the valve port is connected to the lever. One top point is connected to the lever toward the center of the float, and an upper stopper surface is formed in the support hole that contacts the upper surface of the swing shaft when the lever rotates further in the valve closing direction from the position where the valve body closes the valve port Lever float type drain trap.

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