JP2011064229A - Float type drain trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a float type drain trap which can extend the period before clogging of a filter. <P>SOLUTION: A lid body 2 is fastened to a body 1 having an inlet 4 and an outlet 6 to form a casing having a valve chamber 3 inside. A valve seat 9 having a valve hole 7 is connected to the lid body 2 on the lower side wall of the valve chamber 3. A hollowed sphere-like sealed float 11 for opening and closing the valve hole 7 is disposed within the valve chamber 3 in a free state. A foreign matter capturing cap-like filter 15 is disposed above the float 11 in the valve chamber 3, and a holding cylinder 16 placed on the lid body 2 is disposed to hold the filter 15 around the float 11. The filter 15 has a number of filtering holes smaller in diameter than the valve hole 7. The upstream side of the float 11 is allowed to communicate with the inlet 4 through the filter 15. A foreign matter collecting space 17 is formed between the outside of the holding cylinder 16 below the filter 15 and the inner side of the cap body 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a drain trap that automatically discharges drain generated in a steam piping system, a compressed air piping system, and a gas piping system, and more particularly, a float that opens and closes a valve hole directly with a sealed float or via a valve member or the like. It relates to the expression drain trap.

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 hole communicating with the valve chamber and the outlet is opened in the lower side wall of the valve chamber, a hermetic float is placed in the valve chamber, and the float rises and falls directly. A float drain trap that opens and closes a valve hole via a valve member or the like, and a cap-shaped filter for capturing foreign matter is disposed above the float, and a holding cylinder that holds the filter is disposed around the float The upstream side of the float communicates with the inlet via a filter.

JP 2003-240190 A

The conventional float drain trap described above captures foreign matter such as dust, rust and scale flowing in from the inlet by the filter and does not flow down to the secondary side, but the filter is clogged in a relatively short period of time. There was a problem.

Therefore, the problem to be solved by the present invention is to provide a float type drain trap capable of extending the period until the filter is clogged.

In order to solve the above problems, the float drain trap of the present invention forms an inlet, a valve chamber, and an outlet in a casing, and opens a valve hole that communicates the valve chamber and the outlet to a lower side wall of the valve chamber. A float type drain trap that opens and closes the valve hole directly or via a valve member, etc., with a closed float inside the room, and a cap-like filter for capturing foreign matter is placed above the float In addition, when a holding cylinder for holding the filter is arranged around the float and the upstream side of the float communicates with the inlet via the filter, a foreign substance reservoir is placed between the outside of the holding cylinder below the filter and the inside of the casing. It is characterized by forming a space.

According to the present invention, the foreign substance reservoir space is formed between the outer side of the holding cylinder below the filter and the inner side of the casing, so that a part of the foreign substance flowing in from the inlet does not flow down to the filter. By flowing down and not trapped by the accumulation filter, there is an effect that the period until the filter is clogged can be extended.

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

Hereinafter, an embodiment of the present invention will be described with reference to FIG. This embodiment is applied to a free float type steam trap. The casing of the free float type steam trap is formed by a main body 1 and a lid 2 fastened to the main body 1 with a bolt, and has a valve chamber 3 inside. The main body 1 has an inlet 4, an outlet passage 5 and an outlet 6, and the inlet 4 communicates with the upper portion of the valve chamber 3. A valve seat 9 having a valve hole 7 is screwed to the lid 2 on the lower side wall of the valve chamber 3. The valve hole 7 opens obliquely downward. The lid 2 has an outlet passage 10, and the lower portion of the valve chamber 3 communicates with the outlet 6 through the valve hole 7 through the outlet passages 10 and 5. A hollow spherical float 11 for opening and closing the valve hole 7 is disposed in the valve chamber 3 in a free state. Two float seats 12 with which the float 11 abuts at a position where the valve hole 7 is closed are provided below the float 11 and on the side facing the front side of the drawing.

A bimetal 13 as a temperature responsive member is disposed in the valve chamber 3. The bimetal 13 has a substantially U-shaped cross section and is fixed to the lid 2 with a screw 14 at one end. The bimetal 13 is deformed so that the U-shape is narrowed at high temperatures and does not interfere with the float 11, and is deformed so that the U-shape is expanded at low temperatures to lift the float 11 to open the valve hole 7.

A cap-shaped filter 15 for capturing foreign matter is disposed above the float 11 in the valve chamber 3, and a holding cylinder 16 placed on the lid 2 is disposed around the float 11 in order to hold the filter 15. The filter 15 has many filter holes having a smaller diameter than the valve hole 7. The upstream side of the float 11 communicates with the inlet 4 via the filter 15. A foreign substance reservoir space 17 is formed between the outside of the holding cylinder 16 below the filter 15 and the inside of the main body 1. The main body 1 is provided with a blow port 18 for communicating the foreign substance reservoir space 17 to the outside, a blow pipe 19 is connected to the blow port 18, and a blow valve 20 is disposed on the blow pipe 19.

The operation of the free float steam trap of the above embodiment is as follows. A fluid containing foreign matter flows from the inlet 4. Since a part of the foreign matter does not flow down to the filter 15 but flows into the foreign matter storage space 17 and is not captured by the filter 15, the period until the filter 15 is clogged can be extended. Foreign matter in the foreign matter storage space 17 is blown to the outside by the blow valve 20. Part of the foreign matter flows down to the filter 15 and is captured. The fluid in which the foreign matter is captured flows into the valve chamber 3 inside the filter 15. When the inside of the valve chamber 3 is low temperature, the bimetal 13 is deformed so that the U-shape expands, and the float 11 is lifted to open the valve hole 7. Thereby, low temperature air and drain are discharged from the valve hole 7 to the outlet 6. When the temperature of the drain that flows into the valve chamber 3 increases due to the discharge of the low-temperature air and the drain, the bimetal 13 is deformed so that the U-shape is narrowed and does not interfere with the float 11. The float 11 rises and falls according to the amount of drain in the valve chamber 3 to open and close the valve hole 7, and the drain is discharged from the valve hole 7 to the outlet 6. When air flows into the valve chamber 3 and the temperature in the valve chamber 3 drops below a predetermined value, the bimetal 13 is deformed so that the U-shape expands, lifts the float 11 and opens the valve hole 7, Drain from the hole 7 to the outlet 6.

The present invention provides a float type drain that automatically discharges drainage generated in a steam piping system, a compressed air piping system, and a gas piping system by opening and closing a valve hole directly or through a valve member or the like with a sealed float. Can be used for traps.

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Valve chamber 4 Inlet 6 Outlet 7 Valve hole 9 Valve seat 11 Float 15 Filter 16 Holding cylinder 17 Foreign substance storage space

Claims (1)

The casing forms an inlet, a valve chamber, and an outlet. A valve hole that communicates the valve chamber and the outlet is opened in the lower side wall of the valve chamber. A sealed float is placed in the valve chamber. A float type drain trap that opens and closes a valve hole via a member, etc., and a cap-shaped filter for capturing foreign matter is disposed above the float, and a holding cylinder for holding the filter is disposed around the float. A float-type drain trap characterized in that a foreign substance storage space is formed between the outside of the holding cylinder below the filter and the inside of the casing in which the upstream side of the cylinder is communicated with the inlet.

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