JPS5932718B2 - free float trap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a spherical float which floats up and down in accordance with the water level in the condensate reservoir chamber and directly opens and closes the valve hole with its own surface, which is installed in a condensate reservoir chamber communicating with an outlet through an inlet and a valve hole. This invention relates to a free float type trap that automatically discharges condensate generated in a pressurized steam system or pressurized air system.

The above-mentioned free float type trap has features such as the float itself serving as a valve body, a single operating part, and an extremely simple structure with few failures.

In the above-mentioned free float type trap, an inlet opens above the condensate reservoir, a valve hole opens below the condensate reservoir, and the valve hole passes through an outlet passage in the trap housing to the inlet. Most of them have a housing structure as shown in FIG.

To explain the configuration of FIG. 2, 1 is a main body forming a part of the trap housing, 2 is a valve seat member airtightly inserted into the main body 1 with an O-ring 3 interposed therebetween, and 4 is a valve seat member 2. 6 is a plug that holds the valve seat member 2; 7 is a plan view of the plug 6 facing the valve hole 4; 8 is a through hole 9 of the valve seat member 2; An outlet passage 10 communicates with the valve hole 4 through the outlet.

In the free float type trap having the above structure, when the valve is opened, the condensate flowing from the condensate storage chamber 5 through the valve hole 4 to the outlet 10 side collides with the flat part 7 of the plug 6, as shown by the two-dot chain line. , the direction is changed to the exit passage 8 side.

However, the direction-changed condensate flow collides with the inner wall of the outlet passage 8, significantly erodes the colliding portion formed of a material weaker than the plug 6, and finally penetrates the wall of the main body 1, causing the outlet passage 8 to be exposed to the outside. This causes the main body 1 to become unusable and significantly shortens the life of the trap.

In view of the above circumstances, it is an object of the present invention to provide a free-float type trap that does not erode the inner wall of the trap casing due to condensate flowing out from the valve hole and has a long life.

The above object is to form a condensate reservoir in a trap housing, arrange a float in a free state that rises and falls in accordance with the water level in the condensate reservoir in the condensate reservoir, and opens an entrance in Hijikata of the condensate reservoir. A valve seat member that the float directly contacts is protruded below the condensate reservoir chamber to limit the valve hole, and the valve hole is separated from the condensate reservoir chamber and communicated with the outlet through an outlet passage formed inside the trap housing. In a free float type trap, the valve seat member is formed with a valve hole opening into the condensate reservoir chamber and an enlarged hole extending from the valve hole passing through in the axial direction, and an outlet passage from the enlarged hole. forming a through hole opening in the direction, and fixing a plug to the wall of the trap casing on the outlet passage side facing the valve hole;
A free float type in which a guide recess is provided on the face of the plug facing the valve hole to allow the condensate flow to flow out into the space of the outlet passage and to prevent erosion of the inner wall of the trap housing forming the outlet passage. This can be achieved by traps.

The valve seat member is generally made of stainless steel or the like, which is harder than the trap housing wall, and the surface in contact with the float is finished with high precision.

Further, the valve seat member is often fixed in the trap housing by a separate plug or the like, and the plug is often provided with a drilled recess facing the valve hole.

Further, the plug is also made of a material that is harder and more resistant to erosion than the trap housing, since the plug is collided with the condensate flowing out from the valve hole.

The present invention will be explained in detail based on the free-floating steam trap of the embodiment shown in FIG.

Reference numeral 11 denotes a main body, which is fixed to a top cover 13 with bolts and nuts (not shown) with a gasket 12 interposed therebetween, thereby forming a trap housing.

Reference numeral 14 denotes a condensate storage chamber formed within the trap housing, and an inlet 15 opens upward through a cylindrical screen 16.

1T is a spherical float arranged in a free state in the condensate reservoir chamber 14, and is made by welding two metal hemispherical shells with different wall thicknesses.It is an unbalanced float with a center of gravity unevenly distributed, and the two metal hemispherical shells are welded together. However, a polished float whose welded part is finished by polishing or the like, or a molded float made of synthetic resin or the like is used.

Reference numeral 18 denotes a float receiver that is disposed above the condensate reservoir chamber 14 and has a recess 19 that prevents the condensate flowing in from the inlet 15 from directly colliding with the float 17 and stably holds the float 17 during floating. .

20 is a through hole provided in the float receiver 18.

21 is a float seat that determines the lowering position of the float 1γ.

22 is an outlet provided at the other end on the same axis as the inlet 15;
It extends downward through the outlet passage 23 and communicates with the condensate reservoir chamber 14 through the valve seat insertion hole 24 .

A valve seat member 25 is inserted into the valve seat insertion hole 24 from the outside through the plug hole 27, and forms a valve hole 26 that opens below the condensate reservoir chamber 14.

Further, the diameter of the valve hole 26 increases in the outflow direction, thereby reducing passage resistance.

28 is interposed between the outer periphery of the valve seat member 25 and the valve seat insertion hole 24 to maintain airtightness between the condensate reservoir chamber 14 and the outlet passage 23.
It is a ring seal.

Reference numeral 29 is a through hole that communicates the valve hole 26 with the outlet passage 23 side.

A plug 30 is screwed into the plug hole 27 with a gasket 31 interposed therebetween, the tip of which fits into the rear end of the valve seat member 25Ω, and holds the valve seat member 25 against fluid pressure.

Reference numeral 32 denotes a drilled recess formed on the distal end surface of the plug 30 facing the valve hole 26, and an extension line (indicated by a two-dot chain line) passing through the through hole 29 at the angle of the drilled tip is the main body forming the outlet passage 23. 11 is formed so as not to touch the inner wall.

Reference numeral 33 denotes a communication hole that communicates the upper part of the condensate reservoir chamber 14 with the upper part of the outlet passage 23, and an air vent valve seat 35 is screwed into the opening of the condensate reservoir chamber 14 of the communication hole 33 with a gasket 34 interposed therebetween. Ru.

36 is an air vent valve hole 0 37 is a snap ring 3 attached to an annular protrusion 38 on the inner surface of the upper cover 13
A bimetal chamber 40 is formed between the bimetal cover 9 and the inner wall of the upper lid 13.

41 is a through hole provided in the bimetal cover 37;
is a screen that covers the hole.

Reference numeral 43 denotes an air vent valve body disposed opposite to the air vent valve hole 36, and is fixed to a disc bimetal 44 disposed on the upper surface of the screen 42 via a snap ring 45.

Reference numeral 46 denotes a slit provided in the bimetal seat 47 in the annular protrusion 38, which serves as an air passage. The float 17 in the reservoir chamber 14 floats up and down depending on the level of condensate accumulated in the condensate reservoir chamber 14, and continuously adjusts the opening degree of the valve hole 26 according to the amount of condensate flow, thereby achieving the well-known continuous condensate discharge. perform an action.

Furthermore, when the inside of the condensate reservoir chamber 14 is filled with air and enters a near locking state, the bimetal 44
The condensate storage chamber 14 is bent into the illustrated state due to a decrease in temperature inside the condensate chamber 14, and the air filling the condensate storage chamber 14 is discharged from the air vent valve hole 36 to the outlet 22 via the communication hole 33.

When high-temperature steam or condensate flows into the condensate storage chamber 14 after the air has been discharged, the bimetal 44 bends in the opposite direction, causing the air vent valve body 43 to sit on the air vent valve seat 35 and open the air vent valve. Close hole 36.

In the free float type trap that performs the above operation, when the float 17 is in a floating state and the valve is opened, the condensate in the condensate storage chamber 14 flows out from the valve hole 26 to the outlet 22 side, and the condensate flows through the opening part 32. The direction is changed to the angle shown by the two-dot chain line and flows out through the through hole 29 to the outlet passage 23.

Here, the direction change angle of the drill tip recess 32 is set so that the outflow condensate does not collide with the inner wall of the main body 1, and the inner wall of the main body 1 forming the outlet passage 23 will not be completely eroded.

Therefore, it is possible to solve the problem that the inner wall of the main body is penetrated by erosion, the outlet passage is communicated with the outside, and the main body forming part of the trap housing becomes unusable, and a long-life free-floating trap can be provided.

[Brief explanation of drawings]

FIG. 1 shows a sectional view of a free float trap according to an embodiment, and FIG. 2 shows a sectional view of a main part of a conventional free float trap. 1. 11 is the main body, 2 and 25 are valve seat members, 4゜26 are valve holes, 5 and 14 are condensate reservoir chambers, 6 and 30 are plugs, 7 is a plan view, 32 are four drilled parts, 8゜23 is the exit passage, 9,29
is a through hole, 10.22 is an outlet, 13 is a top cover, 15 is an inlet,
17 is a spherical float, 19 is a float cover, 21 is a float seat, 33 is a communication hole, 35 is an air pent valve seat, 36
37 is an air vent valve hole, 37 is a bimetal cover, 40 is a bimetal chamber, 43 is an air vent valve body, and 44 is a disc bimetal.

Claims (1)

[Claims] 1 A condensate reservoir chamber 14 is formed in the trap casings 11 and 13, and a float 1γ that rises and falls in accordance with the water level in the condensate reservoir chamber 14 is disposed in a free state to form a condensate reservoir chamber 14. 14, an inlet 15 is opened above the condensate reservoir chamber 14, a valve seat member 25 with which the float 17 directly contacts is protruded below the condensate reservoir chamber 14, the valve hole 26 is limited, and the valve hole 26 is separated from the condensate reservoir chamber 14 to form a trap. In a free-floating trap that communicates with the outlet 22 through an outlet passage 23 formed in the casings 11 and 13, the valve seat member 25 has a valve hole 26 that opens into the condensate reservoir chamber 14 and a valve hole 26 that opens into the condensate reservoir chamber 14. A trap housing on the outlet passage 23 side facing the valve hole 26 is formed with a through hole 29 extending axially through the enlarged hole extending from the valve hole 26 and opening in the direction of the outlet passage 23 from the enlarged hole. Body 11.13 Plug on the wall 3
0 is fixed to the surface of the plug 30 facing the valve hole 26, and the condensate flow flows out into the space of the outlet passage 23.
A free-float type trap provided with a guide recess 32 machined at an angle that does not erode the inner walls of the trap casings 11 and 13 that form the trap.