JPS594599B2 - Free float steam trap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a condensate reservoir chamber that communicates with an outlet through a valve port, and a float that ascends and descends according to the liquid level in the chamber and opens and closes the valve port with its own surface. The present invention relates to a free float steam lamp in which an inlet through which a steam system is conducted and condensate generated in the system flows is connected to the condensate storage chamber.

As a prior art for the present invention, there is a free float type steam trap disclosed in Japanese Patent Application No. 48524/1982.

An overview of this structure will be explained. A condensate reservoir chamber is provided with an inlet communicating with the outlet and an outlet communicating through the valve port.

A float is housed in a free state in a condensate chamber, and the valve port is directly opened and closed by floating up and down according to the water level in the condensate chamber.

Install a float cover above the float in the condensate storage room.

A plurality of inflow holes are provided in the float cover along the inner wall of the condensate reservoir chamber, and condensate flows down along the inner wall of the condensate chamber without hitting the float.

The trap with the above structure has the following problems.

Condensate flows in a substantially cylindrical shape along the inner wall of the condensate reservoir chamber, and even if the float floats up, there is a substantially constant gap between the float and the flow of condensate.

The floating float moves freely within this flow, and this movement causes disturbance of the water surface in the condensate storage chamber, causing the float to become more violently agitated.

For this reason, the float may collide with the inner wall of the condensate storage chamber, causing dents on the surface, or causing the float to tear and sink.

It also happens that the float approaches the valve orifice and obstructs the discharge flow, reducing the discharge amount.

The technical problem of the present invention is to prevent a floating float from being shaken by the flow of condensate flowing down into a condensate storage chamber.

The configuration of the present invention is as follows.

A condensate reservoir chamber is provided which communicates with the inlet and communicates with the outlet through a valve port.

A float is disposed in the chamber, which floats up and down according to the liquid level in the chamber and opens and closes the valve port with its surface.

Means is provided for dispersing condensate from the inlet onto the float in a substantially conical ring shape and flowing it down into the condensate reservoir chamber.

The operation of this configuration is as follows.

The condensate flows down into the condensate reservoir chamber in a substantially conical ring shape, and the higher the float floats, the more the gap between the flow of condensate and the float decreases, and the range of movement of the float becomes narrower.

Therefore, the higher the float floats, the more difficult it is to move, and the more difficult it is to collide with the inner wall of the condensate storage chamber and cause dents on the surface, tear, and sink.

Furthermore, the float approaches the valve port and obstructs the discharge flow, making it difficult to reduce the discharge amount.

The center of the approximately conical annular diffusion of condensate from the inlet into the condensate reservoir chamber may be on the spherical center of the float when the valve is closed, or may be on the spherical center of the float when the valve is half open. It is sufficient that most of the float is located within the conical annular radiation.

Also, the condensate generally dissipating conical ring may point vertically downward, or may be tilted downward to capture the float within its solid angle.

The substantially conical condensate ring may be formed by a linear flow or by a film flow.

Next, a detailed explanation of the embodiment will be given.

In the first embodiment shown in FIGS. 1 and 2, reference numeral 1 denotes a main body to which a lid 2 is fixed to form a valve housing.

3 is a condensate storage chamber, which forms a substantially cylindrical space and has a hemispherical bottom surface.

A valve port 5 defined by an inwardly projecting valve seat 4 is provided on the lower side surface of the condensate reservoir chamber 3.

The condensate reservoir chamber 3 communicates with an outlet 6 through a valve port 5.

7 is a rising passage that communicates the valve port 6 and the outlet I.

A spherical float 8 is arranged in a free state within the condensate reservoir chamber 3.

The float 8 consists of a thin hemispherical shell piece 8' and a thick hemispherical shell piece 8''.
formed by welding them together.

Weld line 9 is not polished. The unbalanced float 8 thus formed has a property that its center of gravity is deviated from the center of the ball toward the thick-walled float piece 8'' side, and that the weld line 9 becomes parallel to the liquid surface when submerged in liquid.

10 is a float seat.

The float seat 10 projects upward from the bottom surface of the condensate reservoir chamber 3, and its upper surface is flat.

The lowest lower limit of the float 8 is determined by the float seat 10.

The valve port 5 is connected to the float 80 when seated on the float seat 10.
It is located below the plane passing through the spherical center, and the end surface of the valve seat 4 forms a surface perpendicular to the spherical center.

An annular projection 11 projecting inward is provided on the upper side surface of the condensate reservoir chamber 3.

A float cover 12 is placed on the annular projection 11 .

The float cover 12 has a dome shape with a radius of curvature larger than that of the float 8, and the lower end edge is a flange shape.

The flange-shaped portion is placed on the annular projection 11 and fixed with a snap ring 17 fitted into an annular groove on the side surface of the condensate reservoir chamber 3.

A condensate dispersion piece 13 is attached to the lower side of the float cover 12.

The piece 13 is shaped like a spherical shell and has a lower surface with a radius of curvature that is approximately the same as the outer surface of the float 8.
is fixed to the top center of the foot cover 12.

16' and 16'' are large and small through holes provided at the top of the float cover.

The through holes 16, 16'' are arranged at equal intervals along the inner circumference of the dispersion piece 13.

The large through hole 16' is arranged on the side away from the valve port 5, and the small through hole 16'' is arranged closer to the valve port 5.

Reference numeral 18 denotes an inlet, which is connected to the pressure steam system and communicated with the upper surface of the float cover 12 .

Next, the operation of the above steam trap will be explained.

When there is no inflow of condensate into the inlet 18 and the liquid level in the condensate reservoir chamber 3 is low, the float 8 is seated on the float seat 10 and its surface abuts the valve seat 4vI-, closing the valve port 5. .

Next, when condensate flows into the inlet 18, the condensate flows through the through hole 16',
16'', the dispersion plate 13 turns the flow into a substantially conical annular film-like dispersion flow, and the flow flows down around the float 8.

When the liquid level in the condensate reservoir chamber 3 rises, the float 8 also rises, rotates and swings about one point on the valve seat 4, opens the valve port 5, and discharges the condensate.

The position of the float 8 when the swinging valve is half-open is indicated by a chain double-dashed line A.

If the inflow rate and the discharge rate are balanced, the above-mentioned half-open state is maintained, but if the inflow rate increases further, the float 8 is guided to the center of the generally conical diffusion film flow, and the float 8 is opened. 8 is guided to the position shown by the two-dot chain line B and held at that position.

At this time (D), the lower surface of the dispersion piece 13 contributes to holding the float 8.

Also, through this process, a substantially conical annular dispersed flow is generated at the valve port 4.
Since the force is stronger on the side away from the float, a counterclockwise rotational force acts on the float 8 in FIG.
increases in the direction away from the valve port 5.

Next, when the flow of condensate to the inlet 18 decreases and finally stops, the float 8 descends together with the liquid level in the condensate reservoir 3, seats on the float seat 10, and closes the valve port 5.

By repeating the above operations, condensate generated in the pressure steam system is automatically discharged.

3 and 4 show other embodiments.

This embodiment differs from the previous embodiment only in the float and the float cover, so the description of the other components will be as follows.
, 2 are given the same reference numerals as those in Figure 2, and their explanation will be omitted.

The spherical float 108 has two hemispherical shell pieces 108 with the same wall thickness.
', 108'' are welded together, and one hemispherical shell piece 10
A weight 120 is fixed to the inside of 8'.

Therefore, it has the same unbalanced float characteristics as the float 8 of the previous embodiment.

The float cover 112 has a disc shape, and through holes 116 are bored in the direction of the generatrix at equal intervals along the circumference where the generatrix of a cone centered on the spherical center of the float 108 in the half-open position intersects with the float cover 112. It is set up.

The through hole 116 provides a substantially conical annular condensate dissipation linear flow.

In operation, when the liquid level in the condensate reservoir chamber 3 rises, the float 108 floats up and swings around a point on the valve seat 4, resulting in the state shown by the two-dot chain line A'.

When the liquid level in the condensate reservoir chamber 3 further rises, the float 108
The valve seat floats 4 km away.

At this time, since the approximately conical annular linear flow from the through hole 116 flows down evenly centered on the spherical center of the float when it is half open, the float 108 floats directly upward, and the unbalanced float 108 Due to this effect, the weld line 9 floats parallel to the liquid level.

In this way, it is guided into a linear flow having a substantially conical annular shape and is held at a predetermined floating position (see chain double-dashed line B').

When the flow of condensate into the condensate reservoir chamber 3 decreases and stops, the float 108 descends with the weld line 9 parallel to the liquid level as the liquid level decreases, and as shown in FIG. 1
0 and close the valve port 5.

When the valve is closed, the float 1 is placed at the position indicated by the two-dot chain line A'.
The surface of the float 108 contacts the valve seat 4, rotates around the corresponding contact point, descends further, and seats on the float seat 10. Therefore, when the valve is closed, the weld line 9 of the float 108 is in contact with the valve port 5.
Become apart from.

The present invention has the following unique effects.

This makes it difficult for the float to collide with the inner wall of the condensate storage chamber.
There is no need to make the float thick in preparation for this collision.

Therefore, the effective buoyancy can be increased by making the wall thickness of the float thinner and its own weight smaller, and the operating force for opening and closing the valve port increases accordingly, allowing the opening and closing of a large-diameter valve port.

In order to prevent the float from colliding with the inner wall of the condensate reservoir chamber even if it oscillates, the gap between the float and the inner wall of the condensate reservoir chamber may be increased if the condensate reservoir chamber is made larger.

In the present invention, since the floating range of the float is regulated by the approximately conical flow of condensate, there is no need to increase the size of the storage chamber, and the casing that forms this storage chamber can be made smaller, allowing the trap to be made smaller. .

Since the float is located on the center axis of the substantially conical annular condensate flow, the float is not too far away from the valve port and there is no delay in closing the valve, so the valve closing response is good and the valve can be closed quickly.

[Brief explanation of drawings]

The figure shows an embodiment of a free-floating steam trap according to the invention. Fig. 1 is a longitudinal sectional view of the first embodiment, Fig. 2 is a plan view of the float cover used in the first embodiment, Fig. 3 is a longitudinal sectional view of the second embodiment, and Fig. 4 is a longitudinal sectional view of the float cover used in the first embodiment. FIG. 3 is a plan view of a float cover used in an example. 1 is a main body, 2 is a lid, 3 is a condensate storage chamber, 5 is a valve port, 6 is an outlet, 8, 108 is a float, 12° 112 is a float cover, and 18 is an inlet.

Claims (1)

[Claims] 1 A float that rises and falls according to the liquid level in the chamber and opens and closes the valve port on its own surface is placed in a condensate reservoir chamber that communicates with the outlet through the valve port, and a float is placed above the condensate reservoir chamber to collect condensate from the inlet. A free float type steam trap characterized in that a means is provided for dispersing condensate in a substantially conical ring shape around the float and flowing it down into the condensate reservoir chamber.