JP3243579B2 - Defoaming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defoaming apparatus for use in, for example, a vacuum cleaner for collecting sewage.

[0002]

2. Description of the Related Art Generally, in a vacuum cleaner for collecting sewage, a large amount of bubbles accumulate in a sewage tank because air is sucked together when collecting the sewage. If the tank is full of foam, it will not be able to contain sewage enough,
As a result, there has been a problem that it is impossible to sufficiently collect wastewater.

Further, there is a problem that bubbles in the tank may be sucked into the vacuum motor and discharged to the outside, may cause a failure of the motor, and furthermore, bubbles may be scattered around the tank and the surroundings may be stained. There was a point.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. It is an object of the present invention to effectively remove bubbles and to sufficiently contain sewage and the like. It is an object of the present invention to provide a defoaming device which is not likely to adversely affect the vacuum motor and the outside.

[0005]

A defoaming device according to the present invention comprises a cylindrical tank for storing a liquid, a hose for discharging a liquid in a tangential direction along an inner peripheral surface of the tank, and an upper opening of the tank. A cover plate having an exhaust hole in the center, a tubular body vertically provided on the lower surface of the cover plate around the exhaust hole, and further having a vent hole, and a periphery of the tubular body. And a vacuum motor for discharging the air in the tank out of the exhaust hole to reduce the pressure in the tank. In addition, a hole for water flow is provided at the bottom or lower portion of the cylindrical body, and a float is vertically movably accommodated in the cylindrical body, and the float is floated by the liquid penetrating from the hole, so that the liquid is floated. It is also characterized in that the exhaust hole is closed when it is full. Further, a solid defoaming agent is set on the upper surface of the fin.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a cylindrical sewage tank, on the top of which a circular cover plate 2 is covered. Reference numeral 3 denotes a suction hose, whose discharge port 3a is attached so as to face the inside of the sewage tank 1. The outlet 3
a is oriented so that sewage can be discharged tangentially along the inner peripheral surface of the sewage tank 1. Cover plate 2
An exhaust hole 2a is opened in the center portion of the sewage tank 1 to discharge the air in the sewage tank 1 to the outside.

[0007] Reference numeral 4 denotes a mesh cylinder, which is vertically provided on the lower surface of the cover plate 2. Two donut-shaped fins, that is, an upper fin 5 and a lower fin 6 are attached to the mesh tube 4. The upper fins 5 are provided at appropriate intervals near the cover plate 2, and the lower fins 6 are attached to the lower end of the mesh tube 4. Appropriate intervals are maintained between the outer peripheral edges of these fins 5 and 6 and the inner peripheral surface of the sewage tank 1.

In the mesh tube 4, a column-shaped (or hollow inside) float 7 is accommodated so as to be vertically movable. The float 7 is preferably made of a material lighter than water, but may be a material heavier than water when the inside is hollow. A float adjusting weight 7a is attached to the lower surface of the float 7, but may be omitted. still,
Float 7 does not fall from inside mesh tube 4
It is held by the mesh tube 4 or the lower fin 6.

Reference numeral 8 denotes a solid defoaming agent, which is set on the lower fin 6 via a storage basket 9. Examples of the solid defoaming agent 8 include a solidifying agent (melting point modifier) in silicone oil and / or modified silicone oil,
Although the present invention is a solid silicone antifoaming agent to which an emulsifier, a coupling agent and the like are added, the present invention is not limited to this, and any conventionally known solid antifoaming agent may be used.
In particular, a commercially available silicone-based solid defoamer KM601S
(Shin-Etsu Chemical Co., Ltd.) or our colon (Nisso Shoji Co., Ltd.) is preferably used.

A suction tube 10 is mounted on the upper surface of the cover plate 2. The suction tube 10 is provided with a large number of exhaust ports 10a. 11 is a vacuum motor, 12 is a cover, 13
Is a squeegee for sucking sewage on the floor.

Since the defoaming device of the present embodiment is configured as described above, when the vacuum motor 11 is operated, the air in the sewage tank 1 is moved to the inside of the mesh cylinder 4 as shown by an arrow. Enter, pass through the exhaust hole 2a, and
Since the gas is exhausted to the outside from a, the pressure in the sewage tank 1 is reduced.

When the pressure in the sewage tank 1 is reduced, the squeegee 13 sucks sewage on the floor surface into the suction hose 3 and discharges the sewage into the sewage tank 1 from the outlet 3a.
At this time, since the discharge port 3a is directed in a tangential direction along the inner peripheral surface of the sewage tank 1, the discharged sewage is accumulated in the sewage tank 1 while causing a so-called liquid cyclone phenomenon. .

[0013] Since bubbles are sucked and discharged together with the above-mentioned sewage, and bubbles are generated also during discharging and rotation,
A large amount of bubbles accumulate on the sewage surface in the sewage tank 1. This foam also rotates with the rotation of the wastewater, and collides with the wall surface of the wastewater tank 1 due to the rotation of the so-called cyclone effect to be defoamed. However, the remaining bubbles are collected at the center of rotation and rise, but are guided by the lower fins 6 toward the outer peripheral wall surface and again undergo the defoaming action.

The foam rising from the lower fin 6 violently hits the solid defoamer 8 while rotating at high speed. The bubbles disappear due to this collision. Further, at the time of collision, the solid defoamer 8 slightly dissolves into the sewage. The foam rising at the center between the fins 5 and 6 is guided to the outer periphery by the upper fin 5.

As the level of the sewage rises, the float 7 also rises. When the dirty water surface approaches the full water surface position between the upper and lower fins 5 and 6, the upper surface of the float 7 closes the exhaust hole 2a. When the exhaust hole 2a is closed, the vacuum motor 1
Since the suction resistance of 1 increases and the load increases, the sound of the vacuum motor 11 changes. The operator hears the change in the sound of the vacuum motor 11 and stops the vacuum motor 11. The operation of stopping the vacuum motor 11 may be performed automatically.

In the above embodiment, the cylindrical mesh cylinder 4 is used as the cylindrical body. However, the present invention is not limited to this. The triangular, quadrangular or polygonal cylindrical body, or the elliptical cylindrical body is used. Any shape, such as a body, may be used as long as it can smoothly guide the float contained therein up and down. However, induction efficiency (friction, twist, etc.)
Considering the above, a cylindrical shape is preferable. In addition, the cylindrical body may have a structure that allows ventilation and water flow, such as a perforated one or a perforated metal, in addition to a mesh. As a structure capable of ventilation, the entire side surface does not necessarily have to be a ventilation structure as in the case of the mesh cylinder 4 described above. In other words, even if the liquid surface becomes full at the middle position of the cylindrical body, air on the liquid surface is It is sufficient that the cylindrical body has a ventilation hole so that the air can be evacuated with a vacuum motor. Further, as a structure through which water can flow, a structure in which the float can rise when the liquid level rises, that is, at least a hole for water passage may be provided at the bottom or lower portion of the cylindrical body.

In the above embodiment, the defoaming device relating to the vacuum cleaner for sucking sewage has been described. However, the present invention is not limited to this, and any device can be used as long as it handles liquid that generates foam. Is also applicable. Therefore, the liquid in the present invention is not limited to sewage.

[0018]

【The invention's effect】

1) Since the bubbles are effectively eliminated as described below, a large amount of liquid can be stored in the tank without being disturbed by the bubbles. 2) Since liquid is discharged in a tangential direction along the inner peripheral surface of the tank and the liquid falls along the inner wall surface of the tank, bubbles are less likely to form. 3) Since the liquid is discharged in a tangential direction along the inner peripheral surface of the tank, the liquid rotates, so-called a liquid cyclone phenomenon occurs, and the foam collides with the wall surface of the tank and disappears. 4) Bubbles gathering at the center and rising are guided to the outer periphery by the fins and are again eliminated by the wall surface. 5) Further, when the upper and lower fins are arranged at appropriate intervals, the foam rotates at a high speed between these fins, and as a result, collides with the solid antifoaming agent and is defoamed. 6) Bubbles collected near the exhaust hole are guided to the outer periphery by the upper fins, so that they are sucked in by the vacuum motor,
There is no danger of being discharged outside. 7) When the liquid level rises to the full position, the exhaust hole can be reliably closed by the float. 8) Since a solid antifoaming agent is used, the antifoaming agent gradually elutes without excessively dissolving in the wastewater. As a result, the defoaming effect can be stably and economically exhibited over a long period of time.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a defoaming device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewage tank 2 Cover plate 2a Exhaust hole 3 Suction hose 3a Discharge port 4 Mesh cylinder 5 Donut-shaped upper fin 6 Donut-shaped lower fin 7 Float 8 Solid defoamer 9 Storage basket 10 Suction cylinder 10a Exhaust port 11 Vacuum motor 12 Cover 13 Squeegee

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-48208 (JP, A) JP-A-56-48209 (JP, A) JP-A-54-140269 (JP, A) JP-A 50-48 141764 (JP, A) JP-A-55-54082 (JP, A) JP-A 50-96642 (JP, U) JP-A 50-5271 (JP, U) JP-A 60-1407 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B01D 19/00-19/04

Claims (3)

(57) [Claims] 1. A cylindrical tank for storing a liquid, a hose for discharging the liquid in a tangential direction along an inner peripheral surface of the tank, an upper opening of the tank is closed, and an exhaust hole is formed in a central part. A lid plate, a tubular body vertically provided on the lower surface of the lid plate around the exhaust hole, and further having a vent hole, a donut-shaped fin attached around the tubular body, and the tank A defoaming device comprising a vacuum motor for exhausting the air inside from the exhaust hole to reduce the pressure in the tank. 2. A water hole is provided at the bottom or lower portion of the cylindrical body, and a float is vertically movably accommodated in the cylindrical body, and the float is floated by liquid penetrating from the hole. 2. The defoaming apparatus according to claim 1, wherein the exhaust hole is closed when the liquid is full. 3. The defoaming device according to claim 1, wherein a solid defoaming agent is set on the upper surface of the fin.