JPH04334564A - Two-liquid separating recovery device - Google Patents

Abstract

PURPOSE:To ensure that only a single drive source is required and thereby the compactness of a device and energy saving can be realized with the capability of operating a pump functional part intermittently by connecting a recovery functional part to the pump functional part which is conventionally provided separately. CONSTITUTION:The subject device is designed so that a floating liquid between two mutually insoluble liquids such as water and oil is recovered by separation using a vortex centripetal force method. A recovery functional part consists of one or more spiral plates 1 half-submerged horizontally below the liquid level and a suspending device 12 supporting the spiral plates. In addition, an enveloped cylinder 4 is provided in the central of the recovery functional part in such a manner that a lower end member is positioned deeper than the spiral plate 1. At the same time, a vortex impeller 3 is installed in a cylindrical cover 2 provided beneath the spiral plate. The spiral plate 1 is connected to a motor shaft through a reduction gear part 10 and is driven by a motor. On the other hand, the pump functional part consists of an impeller 6 mounted in a pump casing 8 as a centrifugal pump, and the pump shaft is connected to the motor shaft 11 through a clutch part 9.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for separating and recovering a floating liquid between two mutually insoluble liquids, such as water and oil or an organic solvent, using a centripetal force method using a vortex flow.

0002

[Prior Art] Separation and recovery methods using eddy currents for two mutually insoluble liquids include a centrifugal force method using high-speed rotation that utilizes the difference in specific gravity (for example, Japanese Patent Publication No. 52-47185, etc.), and a method based on inertia of motion within a rotating coordinate system. There is a centripetal force method (for example, Japanese Patent Publication No. 59-20807) using low-speed eddy currents that utilize force. The former method is difficult to recover when the amount of liquid to be recovered is small, but the latter method is being used in a wide variety of fields because it can be collected in small amounts, continuous collection is possible, and it saves energy.

0003

[Problem to be solved by the invention] Although the centripetal force method using low-speed eddies has a collection function that efficiently collects the collected floating liquid in the center, it does not have a pump function to suck and discharge it from there, so a separate pump device is required. have to,
For this purpose, two types of prime movers and two systems of power sources are required depending on the specification conditions, and the equipment becomes large and inconvenient to install.In particular, float type, which is used floating on the liquid surface, needs to be made smaller and lighter. There was a problem with the power supply.

0004

[Means for Solving the Problems] The present invention integrates both the rotary function section and the pump function section into a device that has both functions, and integrates the two prime movers into one, thereby providing a power source. In addition to centralizing the equipment to make it more compact and save energy,
While the recovery function is kept in continuous operation, only the pump function can be operated intermittently depending on the situation of the recovered liquid.
It also made it possible to automate the operation.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a longitudinal sectional view of an embodiment of the apparatus of the present invention, showing the apparatus suspended above the liquid level of a water tank T. Note that Q is the unrecovered liquid in the water tank (hereinafter simply referred to as liquid Q), and R is the recovered liquid that has floated to the liquid surface. Also liquid Q and R
It is assumed that the mixed liquid flows in from a supply port (not shown) and flows out from a discharge port (also not shown), so that the liquid level is always maintained at a constant level. Note that Figure 2 is A of Figure 1.
3 is a sectional view taken along the line B-B. First, the collection function section will be explained. In FIGS. 1 and 2, the spiral plate 1 has a central part formed into a cylindrical shape with an enveloping circle, and is suspended from the upper plate of the water tank T by a hanging tool 12 so that it is horizontal to the liquid surface, and the lower half is submerged in the liquid. The lower end member of the envelope cylinder 4 is configured to be deeper than the surrounding spiral plate members, and the upper end of the envelope cylinder 4 is appropriately submerged in water so as not to obstruct the intrusion flow path of the recovered liquid R. There is. In the embodiment shown in FIG. 1, there are two spiral plates 1, but one or more spiral plates 1 may be used. A cylindrical cover 2 is held concentrically just below this spiral plate, the upper end surface of the cover is provided with a concentric hole smaller than the diameter of the cylindrical part, and the lower end is left open in a cylindrical shape. Also, inside this cylinder,
A vortex impeller 3 that generates a vortex is attached to a pipe shaft 5 and is configured to rotate in the winding direction of the vortex plate 1 (clockwise in FIG. 2). In particular, the pipe shaft 5 has an upper end connected to a prime mover shaft 11 via a reducer section 10, and a lower end connected to an inlet of a pump function section disposed below.
They are rotatably engaged via suitable sliding bearings. Here, the reduction gear section 10 is explained. In FIG. 1, it is a gear type, but it may be a belt type.
In some cases, it is necessary to adjust the vortex velocity, so a conventionally known continuously variable transmission or the like may be used. Further, the prime mover is also constituted by a conventionally known electric motor with a reduction gear, hydraulic motor, or air motor. In the recovery function units 1 to 5 configured as described above, the prime mover shaft 11
When the pipe shaft 5 is rotated through the reducer section 10, the vortex impeller 3 is driven at a low speed. Then, the liquids Q and R generate a vortex flow as shown by the arrow, and the recovered liquid R on the liquid surface is guided to the center by the interaction of the swirl plate 1 and the swirling flow, as shown in FIGS. 1 and 2, and the liquid Q in the lower layer is collected in the enveloping cylinder 4 while being separated, and gradually accumulates thickly. Since the liquid Q is dispersed below the cylindrical cover 2, the recovered liquid R on the liquid surface side is efficiently recovered without being prevented from flowing in. The above is an outline of the explanation of the operation of the collection function section. Note that this series of operations is performed at low rotation speed, which has the advantage of extremely energy-saving operation. Next, the pump function section will be explained. In FIGS. 1 and 3, a pump casing 8 is arranged and fixed with a holder (not shown) below the recovery function part, and a pump impeller shaft (hereinafter simply referred to as pump shaft) 7 has a pump impeller 6 attached therein. is rotatably mounted to form a centrifugal pump. Note that centrifugal pump is a general term for centrifugal pumps, cascade pumps, etc. In this way, the pump shaft 7 extends upward from the suction port at the upper center of the pump casing 8, passes through the axis of the pipe shaft 5, and is rotatably engaged with the bearing 15 at the upper end to form a double shaft. However, it is connected to the prime mover shaft 11 via the clutch portion 9 (via the joint 17 in FIG. 4). In this way, both the vortex and pump impellers are driven by the same prime mover. Further, 14 is a drain pipe. The pump suction mechanism, which is a feature of the device of the present invention, will be explained in the device arranged and configured as described above. In order to suck the collected liquid R in the upper envelope cylinder 4 into the lower pump chamber, a passage communicating therebetween is required. Therefore, the pipe shaft 5 is devised so that it can also be used as a suction pipe. That is, in order to reduce the flow resistance of the liquid, the inner diameter of the pipe shaft 5 is set at least twice the diameter of the pump shaft 7, and one inlet hole 13 for the recovered liquid is provided below the liquid level in the envelope cylinder 4. The lower end of the pipe shaft 5 passes through the vortex impeller 3 to reach the pump suction port, and is rotatably engaged with the pipe shaft 5 through a suitable bearing. In the pump function sections 6 to 9 configured as described above, the pump shaft 7 is connected from the prime mover shaft 11 via the clutch section 9 as shown in FIG.
When rotated in the direction of the arrow, the collected liquid R accumulated in the envelope cylinder 4 passes through the inlet hole 13 of the pipe shaft 5 into the double shaft,
Enter the inlet of the centrifugal pump. Then, due to the centrifugal force of the pump impeller 6, it is discharged from the drain pipe 14 to the outside of the water tank. The above is an outline of the explanation of the operation of the pump function section. What should be noted here is that the pump discharge rate is constant regardless of the amount of recovered liquid. Therefore, when the recovery function section and the pump function section are driven simultaneously, as the proportion of the recovery liquid R decreases, the proportion of the liquid Q mixed in increases accordingly. Eliminate this inconvenience,
In order to discharge only the recovered liquid, the pump must first be stopped until the recovered liquid R accumulated in the envelope cylinder reaches a predetermined amount. Then, when a predetermined amount is reached, the pump is activated. Then, when the accumulated amount decreases again and the boundary between liquids Q and R approaches the inflow hole 13, the pump may be stopped again. In order to repeatedly perform such an operation, the drive of the pump shaft may be appropriately connected and disconnected by the clutch portion 9 to perform intermittent operation. Next, automation of this intermittent operation will be explained. As shown in FIG. 1, the collected liquid detection sensors S are installed inside the envelope cylinder 4 at the upper and lower limits of the operating range of the pump, or when the generation rate of the collected liquid is almost constant. , the engagement and disengagement of the clutch section 9 is automatically controlled by setting the respective time periods with timers for operating time and rest time provided in the external control section P, and the pump impeller 6 is controlled automatically. It is sufficient to perform intermittent driving. The clutch portion may be controlled by a conventionally known electromagnetic force, hydraulic pressure, or pneumatic force, and the recovered liquid detection sensor S is preferably a capacitance type sensor, an ultrasonic type sensor, or the like. The above is an overview of the pump intermittent automatic operation system, which is another feature of the device of the present invention. Next, another embodiment shown in FIG. 4 will be described. This is a simple embodiment in which the vortex impeller of the recovery function section and the pump impeller are integrated into a two-story structure and rotated by one drive shaft. Sho 16
is a collection trap, which is effective when collecting a small amount of thin film floating liquid, and can be similarly applied to the embodiment shown in FIG. I will leave the functional explanation for this later and explain the two-story structure impeller first. In FIG. 4, a donut-shaped disk is pasted on the blades of the lower pump impeller 20, and the upper impeller 19 for vortex flow is placed on top of the donut-shaped disk.
are attached concentrically via a cylinder 18 and across the suction side bulkhead of the pump casing to form a two-story integral structure, and are rotatably driven by the pump shaft 7. Figure 4
The pump shaft 7 is directly connected to the prime mover shaft 11 via a joint 17. Due to the above structure, the liquid discharged from the pump chamber rarely leaks to the swirl impeller side. Also, in this double-decker impeller, the lower impeller 20 requires a stronger centrifugal action than the upper impeller 19, so
Sufficient consideration shall be given to the shape, size, number, etc. of the blades. The above is an overview of the structure of the double-decker impeller. This embodiment has the following features. In other words, since the drive shaft only needs to be the pump shaft, the clutch section and reducer section as shown in Fig. 1 can be omitted, and although the pipe shaft 5 has a double shaft structure, it is dedicated to the suction pipe, so it is structurally simpler. This has the advantage of being simplified. Note that the arrangement, structure, and function of the other members except for the recovery trap 16 are the same as in the case of FIG. 1, so the explanation of the operation will be omitted. Next, the effects of the recovery trap 16 will be explained. In FIG. 4, a cup-shaped recovery trap 16 is connected to the suction pipe 15 just below the liquid level in the envelope cylinder 4 (
In the case of application to FIG. 1, the arms 21 are engaged with each other via appropriate sliding bearings, and are held so as not to rotate by arms 21 extending from the envelope cylinder 4. The recovered liquid inflow hole 13 of the pipe shaft 5 is provided near the bottom of the recovery trap, and the upper end of the pipe shaft is rotatably engaged with the pump shaft 7 via a bearing 15, as in the case of FIG. Now, for the sake of explanation, it is assumed that a certain amount of recovered liquid has been collected in the envelope cylinder 4 in advance. When the pump starts operating from this state, the liquid in the recovery trap 16 is first sucked into the pump chamber from the inflow hole 13, the water level in the recovery trap decreases, and the surface liquid in the envelope cylinder flows from its periphery, and thus The dilute recovered liquid floating on the surface layer also flows down and is sucked into the pump chamber from the inflow hole 13. In addition, when recovering with this method, the liquid Q is naturally mixed in, but it is finished in a short time, so the overall amount is small. Rather, it is preferentially recovered from the surface layer of the liquid, so it is an extremely effective means when recovering a small amount of liquid with high diffusivity (eg, gasoline, light oil, etc.). The above is an overview of the embodiment shown in FIG. In this example, the vortex impeller is integrated with the pump impeller, so the range of rotation options is limited, but in an environment where recovered liquid is generated quantitatively, the structure is relatively simple, it can be manufactured at low cost, and it can be used easily. There are advantages such as As explained above, the embodiments shown in FIGS. 1 and 4 regarding the device of the present invention are both fixed type devices, but even if they are applied to a floating type device using a float, the results will be exactly the same. Of course, it can exhibit functional effects.

[0006]

[Effects of the Invention] As explained above, the mutually insoluble two-liquid separation and recovery device of the present invention has an integral structure by vertically connecting the recovery function section and the pump function section, which was conventionally provided separately. , there is an advantage that the driving source can be unified, and the power source can also be unified. In addition, by controlling the clutch part of the pump shaft, intermittent operation can be performed depending on the amount of recovered liquid, and furthermore, it is also possible to automate this using a recovered liquid detection sensor and a timer. In addition to making the device more compact and energy-saving, it also has the advantage of reducing equipment costs.Furthermore, when this is applied to a levitation device using floats, it exhibits maneuverability due to weight reduction and centralization of power. There is a potential effect. Furthermore, the device of the present invention can be used not only for two liquids that are insoluble in each other, but also for the collection of two liquids that have some degree of dispersibility as long as they have different specific gravities, and for the recovery of liquids mixed with buoyant powders. Applicable. Furthermore, even in the same liquid, there may be differences in other chemical components (e.g., oxygen, nitrogen, or phosphorus in the water), suspended microorganisms (e.g., plankton such as red tide or blue-green algae), and physical properties (e.g., liquid temperature, viscosity, PH, etc.). It goes without saying that this method can also be applied to the case where the upper layer liquid containing a region containing a large amount of water is recovered. Therefore, it can be expected to be used not only in production processes in the pharmaceutical, food, and bioindustries, but also in the field of environmental pollution prevention, such as industrial waste liquid treatment and water pollution prevention equipment.

[Brief explanation of the drawing]

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

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a sectional view taken along the line BB in FIG. 1;

FIG. 4 is a longitudinal sectional view of another embodiment of the device according to the invention.

[Explanation of symbols]

1 spiral board
14 Drain pipe 2 Cylindrical cover
15 Bearing 3 Eddy current impeller 16 Recovery trap 4 Enveloping cylinder
17 Joint 5 Pipe shaft
18 Interval 6 Pump impeller 19 (For vortex flow) Upper impeller 7 Pump shaft
20 (For pump) Lower impeller 8 Pump casing 21
Arm 9 Clutch section 10 Reducer section
P control unit 11 prime mover shaft
Q (Non-collected) liquid 12 Hanging tool
R Recovery liquid 13 Inflow hole
S Recovered liquid detection sensor T Water tank

Claims (3)

[Claims] Claim 1: One or more spiral plates are held horizontally half-submerged in the liquid surface, the lower end of the envelope cylindrical member at the center of the spiral is configured to be sunk deeper than the surrounding members, and the upper end surface is below the spiral plate. a cylindrical cover having a concentric hole, and a vortex impeller is arranged concentrically inside the cylindrical cover to constitute a recovery function part,
A centrifugal pump chamber is provided below the pump shaft, and a pipe shaft having an inner diameter sufficiently thicker than the pump shaft is inserted concentrically to the outside of the pump shaft to form a double shaft. A two-liquid separation and recovery device characterized in that an inflow hole is provided at the bottom, the lower end of which is rotatably engaged with the suction port of the pump chamber, thereby communicating the inside of the envelope cylinder and the pump suction port. [Claim 2] A double shaft is constituted by a pipe shaft to which a vortex impeller is attached and a pump shaft passing through this shaft center,
The former is connected to the prime mover shaft through the reducer section, and the latter is connected through the clutch section, and by controlling the connection/disconnection of the clutch section, the vortex impeller continues to rotate.
2. The two-liquid separation and recovery apparatus according to claim 1, wherein only the pump shaft can be operated intermittently. [Claim 3] The vortex impeller is formed into a two-story integral structure with a wall of the pump chamber separated from the upper part of the pump impeller,
2. A two-liquid separation and recovery device according to claim 1, wherein both are rotated by the same drive shaft.