JP2585772B2 - Suction device for suspended matter above the liquid surface - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for sucking suspended matters such as oils and paint residue floating on the liquid level.

[Prior Art] For example, in an automobile painting factory, as shown in Japanese Utility Model Publication No. 59-21856 and Japanese Patent Publication No. 62-1318, washing water is circulated through a liquid storage tank. At this time, floating substances such as paint residue floating on the liquid surface in the liquid storage tank are removed by the suction device.

FIG. 2 shows a conventional general suction device which is used when cleaning water is supplied to a car painting factory 8 by a liquid feed pump 7 and returned to a liquid storage tank 1 by a return pipe 9 and then recycled. Show.

In the figure, 1 is a liquid storage tank, 2 is a pump, 3 is a suction port 4
A connecting pipe for connecting the pump and the pump 2 is connected to the suction port 4 at the liquid level L.
It is a float held in. The float 5 is connected to the suction port 4 so that the suspended matter W on the liquid surface can be efficiently sucked.
At a predetermined position. For this reason, the connection pipe 3 allows the float 5 to follow the liquid surface in addition to the metal pipe 3P.
A part is formed including a flexible hose 3H.

Here, the positional relationship between the liquid level L and the suction port 4 is based on the pump 2
Is determined so that the suspended matter W can be collected while minimizing the air suction amount from the viewpoints of minimizing the drainage amount Q discharged at the time, improving the suction efficiency and protecting the pump. In general,
As shown in JP-A-63-162093, the liquid level L is selected so that the liquid level L is slightly above the center of the suction port 4.

Therefore, when the pump 2 is operated, the suspended matter W is sucked together with the gas and liquid from the suction port 4 and discharged to the outside processing equipment (not shown) through the connecting pipe 3 (3H, 3P).

[Problems to be Solved by the Invention] However, in the above-described conventional structure, the suction efficiency of the suspended matter W may not only fluctuate and decrease but also may not be sucked.

That is, the float 5 is floated on the liquid surface with the best balance and is swung in the R direction shown in FIG.

Then, in the case of swinging and tilting in the direction of the arrow R1, it is very difficult to suck a large amount of liquid and the suspended matter W, resulting in poor efficiency. On the other hand, in the case of swinging inclining in the direction of arrow R2, there is a problem that not only the large amount of air is sucked but the suction efficiency of the suspended matter W is lowered but also the pump 2 is burned.

Further, according to various analyzes by the present applicant, it has been invented that the above-mentioned problem is induced even in the stable normal operation of the float 5 due to the flexibility of the connecting pipe 3 (the hose 3H).
That is, since the hose 3H makes a U-turn in the liquid and extends upward, the air sucked in the bent portion in the liquid accumulates.
As a result, the hose 3H moves intricately and subtly. This movement of the hose causes the float 4 to oscillate and causes the above problem. Furthermore, the triggering phenomenon is amplified in this way, and the float 5 itself may fall over, making it impossible to suck the suspended matter W.

Furthermore, the swing of the float 5 due to the wind wave and the hose 3H
Even if there is no self-induced rocking due to the movement of the liquid, there is a problem that the above-described problem is instantaneously caused by the use speed phenomena such as the displacement speed of the liquid surface L and the mass and floating ability of the float 5.

That is, for example, in the case of the above-mentioned automobile painting factory 8, the descending speed of the liquid level L when the liquid feed pump 7 is started is rapid and high. For this reason, the high water level HL shown in FIG.
When the float 5 starts to descend, the dynamic inertia of itself causes the float 5 to return to the suction port 4 as shown in FIG.
Will sink to the liquid level L. Furthermore, the liquid level L is low water level LL
In the case of the stop, the suction port 4 is entirely submerged in the liquid as shown in FIG. In such a state, a large amount of liquid is sucked, so that the power consumption increases and the suspended matter W cannot be sucked.

However, the float 5 in the state shown in (C) then jumps out of the liquid due to its own floating force and its dynamic inertia. That is, as shown in (D), the suction port 4 faces the atmosphere entirely. Then, a large amount of air is sucked in, the movement of the hose 3H is increased, and a large swing of the float 5 is caused. Thus, not only normal operation is inhibited but also the pump 2 is likely to be damaged.

On the other hand, when the liquid feed pump 7 is stopped, the washing water in the factory returns to slow. Then, as shown in FIG.
Rises from the low water level LL to the high water level HL. In this case too, disadvantages arise from the static inertia of the float 5. That is, the fourth
The state shown in FIG. 7A is changed from the state shown in FIG. That is, since the suction port 4 sinks in the liquid, only the liquid is sucked and the suspended matter W cannot be collected, and the power consumption and the like are disadvantageous, but this is not fatal. However, when returning to the high water level HL, the float 5 jumps out of the liquid level L due to dynamic inertia as shown in FIG. Thereafter, as shown in (D), the birds sink again. Therefore, in the state shown in FIG. 3 (C), the movement of the hose 3H is induced as in the state shown in FIG. 3 (D), and not only the operation becomes impossible, but also the pump is burned.

As described above, such a blotting device has an installation environment, equipment capacity,
If the various conditions such as the mode of use change, it is affected by excessive air suction and the like, and there is an inherent drawback that normal operation becomes difficult and operation becomes impossible.

Here, an object of the present invention is to prevent a large amount of air and liquid from being sucked due to fluctuations in the liquid surface, and to prevent self-induction of float oscillation caused by air accumulated in a connecting pipe, thereby achieving a stable operation with a high suction efficiency. It is an object of the present invention to provide a device for sucking suspended matter above a liquid surface, which can ensure the above.

[Means for Solving the Problems] The present invention is based on the premise that suspended matter is sucked together with gas and liquid in principle and that the liquid surface fluctuates at a certain speed, and the relative position between the suction port and the liquid surface is determined. Is formed so as to be able to be maintained properly.

That is, in the suction device for the suspended matter on the liquid surface attached to the float having the suction port floated on the liquid surface and connected to the pump arranged outside the storage tank through the connecting pipe, the cylinder and the cylinder A speed-adjustable cylinder device comprising a piston slidable at the lower end and having the float attached to the lower end, a first throttle valve for regulating the rising speed of the piston, and a second throttle valve for regulating the descending speed of the piston. The throttle of the first throttle valve is set to be larger than the throttle of the second throttle valve, so that the lowering speed of the float is increased and the rising speed is reduced, thereby achieving the above object.

[Operation] In the present invention having the above-described configuration, the second throttle valve is set to a small throttle within a range in which the float can follow a rapid liquid level drop in light of the mass / inertia of the float, the ability to lower the hose, and the like. If the first throttle valve is set to a large throttle so as to follow a gradual rise in the liquid level, the float will fly out of the liquid to the atmosphere due to the inertia of the float after the high liquid level descent, and the liquid level will rise slowly. It is possible to prevent the air from escaping into the atmosphere due to the dynamic inertia at the end of the operation, and further to prevent the float from sinking into the liquid in these cases, and to minimize the variation in the relative position of the suction port with respect to the liquid surface. Therefore, suspended matter can be sucked smoothly and efficiently without sucking a large amount of air.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1 (overall configuration diagram), the present suction device is formed to include a lifting / lowering speed adjusting means 10 for the float 5.

The same components as those of the conventional suction device shown in FIG. 2 are denoted by the same reference numerals, and the description thereof will be simplified or omitted. Further, in FIG. 1, the liquid feed pump 7, the automobile painting factory 8, and the return pipe 9 are not shown.

In FIG. 1, the elevating speed adjusting means 10 comprises a speed adjusting type cylinder device including a cylinder device 11 and a speed setting unit 21. The elevating speed of the float 5 is made faster and the elevating speed is made slower than the descent speed. It is a means to do.

The cylinder device 11 includes a cylinder 12, a piston 13 that separates an upper chamber 14 and a lower chamber 15 in the cylinder 12, and a piston 13 and a piston 13.
13 and a piston rod 16 extending downward integrally therewith, and fixed to the upper ends of the columns 26 and 26 via a flange 27 as a whole. The float 5 is attached to the lower end of the piston rod 16, and the float 5 is
It is guided up and down freely between six. The columns 26, 26 are formed so as to suppress the swing of the float 5 from left to right and front to back.

The cylinder device 11 applies a resistance force that opposes a descent force caused by the weight of the float 5 or the like and a levitation force caused by the rise of the liquid level L.

Here, it is understood that the elevating speed adjusting means 10 adjusts the ascending speed and the descending speed of the float 5 by changing the resistance applied by the cylinder device 11 by the speed setting unit 21. You.

 The speed setting unit 21 is formed as follows.

That is, a through hole provided on the upper chamber 14 side of the cylinder 12
The check valve 22 and the first throttle valve 23 are connected to 17 via piping. Both valves 22, 23 are connected in parallel. The check valve 22 opens when the piston 13 descends and supplies the atmosphere into the upper chamber 14. On the other hand, the throttle valve 23 throttles and discharges the air in the upper chamber to the atmosphere when the piston 13 rises.

On the other hand, the through hole 18 provided on the lower chamber 15 side has
The check valve 24 and the second throttle valve 25 are connected in parallel via a pipe. The check valve 24 opens when the piston 13 rises and supplies the atmosphere into the lower chamber 15. Throttle valve 25 is piston 13
The air in the lower chamber 15 is released to the atmosphere when the air pressure falls.

The two throttle valves 23 and 25 are uniquely set as follows. The second throttle valve 25 has a high water level shown in FIG.
When the liquid level L suddenly drops from the HL to the low water level LL, the float 5 does not significantly delay due to static inertia and the like, and the liquid level L
The float 5 is adjusted so that the float 5 does not largely sink in the liquid when the liquid level L stops at the low water level LL. On the other hand, the first throttle valve 23 has a low water level.
When the liquid level L rises relatively slowly from the LL to the high water level HL, the throttle is adjusted so as to prevent the float 5 from largely jumping out of the liquid level L due to its dynamic inertia at the high water level HL. . Therefore, when the diameters of the two valves 23 and 25 are the same, the degree of restriction of the second restriction valve 23 is equal to that of the first restriction valve.
It is larger than about 25 aperture.

The two check valves 22 and 24 are selected to have a sufficient capacity in the opening direction so as not to provide a throttle effect.

A connecting pipe 3 for connecting the float 5 and the pump 2
Since the self-oscillation of the float 5 is prevented, the float is formed from a synthetic resin hose to simplify it.
Further, in this embodiment, the connecting pipe 3 is not always disposed in a U-turn close to the float 5 as in the prior art, but is always provided with the float 5.
Is provided so as to apply a pulling-down force.

This means that the connecting pipe 3 does not have such a resistance as to decrease the descending force of the float 5. In other words, the float 5 determines its own weight and the like so that it can descend at a speed comparable to that of the rapid drop of the liquid level L, and the resistance force to follow the descending speed of the liquid level L is applied by the cylinder device 11. It is constituted in.

 Next, the operation will be described.

It is assumed that the liquid level L is at the high water level HL shown in FIG. 1 and the liquid feed pump 7 similar to that shown in FIG. 2 is started.

Then, the liquid level L starts to drop rapidly and rapidly toward the low water level LL. In this case, the float 5 descends at a speed similar to the descending speed of the liquid level L from the balance between its own weight and the pulling force from the connecting pipe 3 and the self-lifting force. In this case, the suction port 4 sinks slightly to the liquid level L as in the conventional example shown in FIG. 3 (B), but the relative position between the suction port 4 and the liquid level L is appropriate without sucking a large amount of air. Is kept. Therefore, a smooth operation can be performed in which the conventional disadvantages of the movement due to the air pool in the hose 3, the swing of the float 5, and the burning of the pump 2 are eliminated.

Further, when the liquid level L becomes the low water level LL, the float 5 does not sink much in the liquid as shown in FIG. 3 (C). Further, since the float 5 is applied with resistance due to the large throttle of the second throttle valve 25, the float 5 (suction port 4) has a large dynamic inertia as in the prior art shown in FIG. 3 (D). It does not fly out into the atmosphere due to the levitation force. Therefore, suction of a large amount of air is prevented.

Conversely, consider a case where the liquid level L is at the low water level LL shown in FIG. 1 and the washing water is returned from the return pipe 9 as a result of stopping the liquid feed pump 7.

Then, as shown in FIGS. 4A and 4B, the float 5 is in a state slightly delayed from the rise of the liquid level L, the suction port 4 is slightly submerged in the liquid, and the floating substance W is temporarily suspended. Can not be sucked. However, it is a safety side that does not inhale air. However, the height difference between the float 5 and the liquid level L increases. If this is left unattended, as shown in Fig. 4 (C), when the water level reaches a high water level HL, it will fly out into the atmosphere largely due to the floating force of the float 5 and the dynamic inertia and suck a large amount of air. Get out.

Here, according to the present invention, since the float 5 is provided with a relatively large resistance force through the piston rod 16 by adjusting the throttle of the first throttle valve 23, the suction port 4 is largely discharged to the atmosphere. There is no. Therefore, also in this case, smooth operation is assured without inhaling a large amount of air.

Incidentally, a large amount of air is sucked from the atmosphere into the upper chamber 14 of the cylinder device 11 through the check valve 22 when the float 5 is lowered, and the air in the lower chamber 15 is slightly throttled by the second throttle valve 25. While being released into the atmosphere. On the other hand, when the float 5 rises, the air is supplied into the lower chamber 15 through the check valve 24, but the air in the upper chamber 14 is greatly restricted by the first throttle valve 23 and released into the atmosphere. Is done.

Thus, according to this embodiment, the first throttle valve 23 for regulating the rising speed of the float 5 and the second throttle valve 23 for regulating the descending speed.
And the float 5 is fixed to the piston rod 16, so that the relative position between the suction port 4 and the liquid level L can be adjusted to the fluctuation of the liquid level L. Regardless, it can be kept constant. Therefore, the suspended matter W can always be stably sucked with high efficiency without sucking a large amount of air from the suction port 4, and power consumption can be reduced because a large amount of liquid is not continuously sucked.

In addition, the speed-adjustable cylinder device forming the elevating speed adjusting means 10 can adjust the resistance of the first throttle valve 23 and the second throttle valve 25 by adjusting the throttling of the float 5 only by adjusting the throttling. Since the adjustment can be easily performed, the setting that matches the conditions such as the difference between the rising speed and the falling speed of the liquid level L and the mass and form of the float 5 can be easily and highly utilized.

Further, since a large amount of air is not sucked in by the action of the speed adjusting cylinder device, the connecting pipe 3 by the air pool can be prevented.
Since the movement of the (hose 3H) does not occur, the connecting pipe 3 can be a simple hose, and the hose can be provided so as to apply a pulling force to the float 5, so that the construction is simple. This also prevents the float 5 from inducing self-oscillation.

Further, since the float 5 is guided by the columns 26, 26 so as to prevent swinging, stable operation is promoted from this point as well.

In the above embodiment, the speed-adjustable cylinder device sets the throttle valves 23 and 25 manually. However, the speed-adjustable cylinder device may be implemented as an automatic setting type. The chambers 14 and 15 are communicated with the atmosphere through the check valves 22 and 24. However, when the mass of the float 5 and the pulling down force by the hose are reduced, the chambers 14 and 15 are moved into the upper chamber 14. You may comprise so that pressurized air may be supplied.

Further, the rising speed and the falling speed of the liquid surface are different from each other, but the present invention can be applied even if these speeds are the same.

[Effects of the Invention] In the present invention, the speed adjusting type cylinder device is provided to increase the descending speed of the float and decrease the ascending speed. This has an excellent effect that the relative position can be properly maintained irrespective of the fluctuation of the liquid level, and the suspended matter on the liquid surface can be sucked efficiently and stably.

[Brief description of the drawings]

1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is an overall configuration diagram of a conventional suction device used in an automobile painting factory, and FIGS. 3 and 4 are suction ports and liquids in a conventional example. FIG. 3 shows a case where the liquid level is falling, and FIG. 4 shows a case where the liquid level is rising. DESCRIPTION OF SYMBOLS 1 ... Reservoir tank, 2 ... Pump, 3 ... Connection pipe, 3H ... Hose, 4 ... Suction port, 5 ... Float, 10 ... Speed adjustment type cylinder device which forms up / down speed adjustment means, 11 ... Cylinder device, 12 ... Cylinder, 13 ... Piston, 23 ...
First throttle valve, 25... Second throttle valve.

Claims (1)

(57) [Claims] An apparatus for sucking suspended matter on a liquid surface, wherein the suction port is attached to a float floating on the liquid surface and connected to a pump disposed outside the storage tank through a connecting pipe, wherein a cylinder and A speed adjusting type including a piston slidable in the cylinder and having the float attached to a lower end thereof, a first throttle valve for controlling a rising speed of the piston, and a second throttle valve for controlling a descending speed of the piston. A liquid level, wherein a silicon device is provided, and the throttle of the first throttle valve is set to be larger than the throttle of the second throttle valve, so that the float descends faster and the ascends slower. Absorber for floating material.