JP2013024271A - Lever float type drain trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lever float type drain trap which hardly allows a foreign matter to stick onto a normally open part and automatically removes the foreign matter sticking onto the normally open part.SOLUTION: The lever float type drain trap includes a valve seat 9 opening a valve opening communicating with a valve chamber 6 and an exit 2 and provided in a lower part of the valve chamber 6. A float 13 is housed inside the valve chamber 6. The float 13 surfacing/descending according to a liquid level inside the valve chamber 6 makes a valve body 16 leave/seat the valve seat 9 via a lever 12 to open/close the valve opening. A short pipe 21 into which the lever 12 is inserted is fixed inside the valve chamber 6. The lever 12 being brought into contact with a lower end 22 inside the short pipe prevents the valve body 16 from seating on the valve seat 9, thereby providing normal gaps 24 and 25 across the whole seal surface of the valve seat 9 between the valve seat 9 and the valve body 16.

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.

A conventional float drain trap is disclosed in Patent Document 1, for example. This is because the casing forms an inlet, a valve chamber, and an outlet, a valve seat that opens a valve port that connects the valve chamber and the outlet is formed in the lower portion of the valve chamber, a float is accommodated in the valve chamber, Depending on the position, the float that rises and falls directly or through the lever, the valve body is attached to and detached from the valve seat, and the drain is automatically discharged by opening and closing the valve port. A plurality of normally open openings are formed between the valve seat and the float or the valve body. The total opening area of the normally-open opening due to this notch is formed to a size that does not allow the drainage generated during the feeding of the piping system to be discharged in order to prevent leakage of steam.

JP 52-151933 A

In the above conventional float drain trap, since the opening area of each normally open opening due to each notch is relatively small and constant, foreign matter such as dust, rust, scale, etc. in the drain flowing down each normally open opening. There is a problem in that the normally open openings are easily deposited on the surface of each normally open opening, and the normally open openings are clogged in a relatively short time.

Therefore, the problem to be solved by the present invention is to provide a lever float type drain trap that can easily remove foreign matter that adheres to the normally open portion because foreign matter does not easily adhere to the normally open portion.

In order to solve the above-mentioned problems, the lever float type drain trap of the present invention has an inlet, a valve chamber, and an outlet formed in a casing, and a valve seat that opens a valve port that communicates the valve chamber and the outlet. The float is housed in the valve chamber, and the float rises and falls according to the liquid level in the valve chamber. The short pipe into which the lever is inserted is fixed in the valve chamber, and the lever is in contact with the lower end of the inner surface of the short pipe to prevent the valve body from being seated on the valve seat. A normally open gap is provided across the entire seal surface of the valve seat.

According to the present invention, the short pipe into which the lever is inserted is fixed in the valve chamber, and the lever contacts the lower end of the inner surface of the short pipe to prevent the valve body from being seated on the valve seat. Since there is a normally open clearance across the entire seal surface of the valve seat, foreign matter adheres to the normally open clearance over the entire seal surface of the valve seat provided between the valve seat and the valve body. In addition to being difficult, foreign matter adhering to the normally open gap is automatically eliminated by the fluid flowing down between the valve seat and the valve body toward the valve opening when the valve body is further away from the valve seat. .

It is sectional drawing of the lever float type drain trap concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. The lever float type drain trap 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 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.

A rocking shaft 11 is supported by a support member 10 attached to the valve seat 9 with screws (not shown), and a lever 12 is rotatably connected to the rocking shaft 11. A hollow spherical float 13 that rises and falls according to the liquid level in the valve chamber 6 is connected to the left end of the lever 12. A connecting shaft 14 parallel to the swing shaft 10 is supported on the right side of the swing shaft 11 of the lever 12, and the upper portion of the connecting rod 15 is rotatably connected to the connecting shaft 14. The lower portion of the connecting rod 15 is rotatably connected to a valve shaft 18 parallel to the swing shaft 11 supported on the upper end portion of the valve rod 17 of the valve body 16. The valve body 16 includes a first valve body 19 that opens and closes the first valve port 7 from the lower outlet 2 side, a second valve body 20 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 17 connecting the body 19 and the second valve body 20.

The short tube 21 into which the lever 12 is inserted is fixed to the valve chamber 6 by welding to the support member 10. The lever 12 is in contact with the inner surface lower end 22 of the short tube 21, thereby preventing the first valve body 19 and the second valve body 20 from being seated on the valve seat 9. Thereby, normally open gaps 24 and 25 are provided between the valve seat 9 and the first valve body 19 and the second valve body 20 over the entire seal surface of the valve seat 9. The opening areas of the normally open openings 24 and 25 when the lever 12 abuts against the lower end 22 of the inner surface of the short pipe 21 are such that the drain generated during the feeding of the piping system cannot be exhausted in order to prevent the leakage of steam. To form. Further, when the lever 12 abuts on the inner surface upper end 23 of the short pipe 21, the lever 12 is further opened from the position where the first valve body 19 and the second valve body 20 fully open the first valve port 7 and the second valve port 8. Prevents rotation in the valve direction. This prevents the float 13 from colliding with the top wall of the valve chamber 6. Further, the portions 12 a and 12 b of the lever 12 that are in contact with the inner surface lower end 22 and the inner surface upper end 23 of the short tube 21 are formed on the float 12 side from the middle 12 c between the center 13 a of the float 13 and the center 11 a of the swing shaft 11. Accordingly, the distance from the center 11a of the swing shaft 11 to the portions 12a and 12b of the lever 12 contacting the inner surface lower end 22 and the inner surface upper end 23 of the short tube 21 can be increased, and the lever ratio can be decreased. Prevent damage.

The operation of the lever float type drain trap is as follows. When the liquid level in the valve chamber 6 is low, the float 13 descends as shown in FIG. 1, the lever 12 contacts the lower end 22 of the inner surface of the short tube 21, and the first valve body 19 and the second valve body 20 Sitting on the valve seat 9 is prevented. As a result, normally open gaps 24 and 25 are formed between the valve seat 9 and the first valve body 19 and the second valve body 20 over the entire seal surface of the valve seat 9 so that the drain of the valve chamber 6 is normally opened. The gas is discharged from the gaps 24 and 25 to the outlet 2. The normally open gaps 24 and 25 are provided between the valve seat 9 and the first valve body 19 and the second valve body 20 over the entire sealing surface of the valve seat 9, so that foreign matter is not easily attached thereto. Since the lever 12 is in contact with the inner surface lower end 22 of the short pipe 21, even if a water hammer or the like is generated in the piping system and the pressure or the liquid level in the valve chamber 6 fluctuates rapidly, the lever 12 is further closed. Can be prevented from rotating. This prevents the float 13 from colliding with the valve chamber bottom wall. Further, the portion 12a of the lever 12 that contacts the inner surface lower end 22 of the short tube 21 is formed closer to the float 12 than the middle 12c between the center 13a of the float 13 and the center 11a of the swing shaft 11, so that the swing shaft 11, the distance from the center 11a to the portion 12a of the lever 12 in contact with the inner surface lower end 22 of the short tube 21 can be increased to reduce the lever ratio, thereby preventing the lever 12 from being damaged. When the liquid level in the valve chamber 6 rises due to the drain flowing from the inlet 1, the float 13 moves up and the lever 12 rotates around the swing shaft 11 in the clockwise direction. The rotation of the lever 12 causes the valve body 16 to move downward via the connecting rod 15 so that the first valve body 19 and the second valve body 20 are further separated from the valve seat 9, and the drain of the valve chamber 6 is opened. Is discharged to the outlet 2 through the normally open gaps 24 and 25 having increased. At this time, the foreign matter adhering to the normally open gaps 24 and 25 is automatically removed by the drain flowing down between the valve seat 9 and the first valve body 19 and the second valve body 20 toward the outlet 2. The lever 12 contacts the inner surface upper end 23 of the short tube 21 at a position where the first valve body 19 and the second valve body 20 fully open the first valve port 7 and the second valve port 8. This prevents the lever 12 from further rotating in the valve opening direction even when water hammer or the like is generated in the piping system and the pressure or liquid level in the valve chamber 6 fluctuates suddenly. Prevent collision with the wall. Further, the portion 12b of the lever 12 that contacts the inner surface upper end 23 of the short tube 21 is formed on the float 12 side with respect to the intermediate 12c between the center 13a of the float 13 and the center 11a of the swing shaft 11, so that the swing shaft 11 can be increased by increasing the distance from the center 11a of 11 to the portion 12a of the lever 12 that contacts the inner surface upper end 23 of the short tube 21, and the lever 12 can be prevented from being damaged.

When the liquid level in the valve chamber 6 decreases due to the drainage, the float 13 moves downward and the lever 12 rotates counterclockwise about the swing shaft 11. Due to the rotation of the lever 12, the valve body 16 moves upward via the connecting rod 15, and the first valve body 19 and the second valve body 20 approach the first valve port 7 and the second valve port 8. The lever 12 abuts against the lower end 22 of the inner surface of the short tube 21, thereby preventing the first valve body 19 and the second valve body 20 from being seated on the valve seat 9, and the valve seat 9 and the first valve body 19. Further, normally open gaps 24 and 25 are formed between the second valve body 20 over the entire seal surface of the valve seat 9, and the drain of the valve chamber 6 is discharged from the normally open gaps 24 and 25 to the outlet 2.

INDUSTRIAL APPLICABILITY The present invention can be used for a lever float drain trap that automatically discharges drain generated in a steam piping system, compressed air piping system, or gas piping system using a float.

1 Inlet 2 Outlet 3 Body 4 Lid 6 Valve chamber 7 First valve port 8 Second valve port 9 Valve seat 10 Support member shaft 11 Oscillating shaft 12 Lever 13 Float 16 Valve body 17 Valve rod 19 First valve body 20 First 2 valve body 21 short pipe 22 inner surface lower end 23 of short pipe upper end 24, 25 inner surface of short pipe

Claims (1)

The casing forms an inlet, a valve chamber, and an outlet. A valve seat that opens the valve port that connects the valve chamber and the outlet is formed in the lower portion of the valve chamber. A float is accommodated in the valve chamber, depending on the liquid level in the valve chamber. In this type of float, which floats up and down, the valve body is attached to and detached from the valve seat via the lever and the drain is automatically discharged by opening and closing the valve port.The short pipe into which the lever is inserted is fixed in the valve chamber. The lever prevents the valve element from being seated on the valve seat by contacting the lower end of the inner surface of the short tube, and a normally open clearance is provided between the valve seat and the valve element over the entire seal surface of the valve seat. Lever float type drain trap.

Images