JPH0420483Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field of the invention) This invention is designed to effectively separate a fluid with a relatively high concentration and a large number of fine-sized particles among impurities into liquid and solid components. The present invention relates to a solid-liquid separator, and particularly to a solid-liquid separator that can stably remove liquid by suction.

(Technical background of the invention and its problems) Cutting oil waste fluid, polishing waste fluid, etc. discharged from cutting machines, polishing machines, etc. contain relatively high concentrations of impurities and many particles with small diameters. often included. Therefore, conventional general filtration devices cannot be applied, and various solid-liquid separation devices have come to be used.

As an example, in recent years, a solid-liquid separation device that is small, inexpensive, can be installed in each machine or in each series, and has excellent solid-liquid separation characteristics has been proposed in Japanese Patent Application No. 60-90430 filed by the present applicant. It is described in. The outline will be described below with reference to FIGS. 2 to 5.

FIG. 2 is an external perspective view showing the schematic structure of this solid-liquid separator. In Fig. 2, 1 is a cylindrical filter medium made of a porous material with a network of connected pores made of a mixed system of phenol resin and polyvinyl acetal resin. ). The cylindrical filter medium 1 (hereinafter simply referred to as "filter medium") has its axial end face sealed with disc-shaped side plates 5A and 5B.
A hollow rotating shaft 4 is connected coaxially with the center hole of this side plate 5A. Since the filter medium 1 has continuous pores and is hydrophilic, liquid components in the stock solution smoothly permeate into the inside due to capillary action. As a result, the filtration resistance becomes small, and the liquid component in the stock solution can be easily sucked into the cylindrical chamber of the filter medium 1 without reducing the internal pressure of the filter medium 1 so much. In addition, the filter medium 1 is connected to the main body at the other end (on the side plate 5B side) via a rotating shaft 2, and a pulley 11 is attached to the middle of the hollow rotating shaft 4.
A belt 14A is wound around the drive wheel 14 of the speed reduction mechanism 13, and the motor 12 is connected to the speed reduction mechanism 13. The filter medium 1 is installed so that its lower half is almost buried in the stock solution tank 7, and the stock solution 31 is discharged from the drain hole 30 of the long pipe onto the surface of the filter medium 1, as shown in FIGS. 3 and 4. undiluted solution 31 that was sprayed and not sucked up
is received in the stock solution tank 7. On the opposite side of the filter medium 1, a scraper 17 serving as a scraping means for scraping off the solid content 18 formed in the form of a cake on the surface of the filter medium 1 is connected to the surface of the filter medium 1 via a spring 20. A container 19 is provided below the scraper 17 to receive the scraped solids 18.
is installed. A suction pump 15 is connected to the end of the hollow rotating shaft 4 via a pipe 16, and the liquid component sucked from the cylindrical chamber of the filter medium 1 is stored in a container (not shown).
Furthermore, as shown in FIG.
The flanges 3A and 3B center the filter medium 1, and the flanges 3A and 3B center the filter medium 1.

To explain the outline of filtration in such a solid-liquid separator, when a stock solution 31 is supplied onto the stock solution tank 7 from the drain hole 30, the liquid component of the stock solution is transferred to the filter medium 1 by the suction force of the suction pump 15. is sucked into the cylindrical chamber of the filter medium 1, and the solid content 18 is deposited in a layer on the outer peripheral surface of the filter medium 1. The liquid component sucked into the filter medium 1 is discharged into the external container via the pipe 16, and the solid content 18 deposited on the outer peripheral surface of the filter medium 1 is scraped off into the container 19 by a scraper 17 provided along the side surface. This results in solid-liquid separation. That is, a drain hole 30 connected to a drain pipe of a cutting machine, a polishing machine, etc.
The stock solution 31 is discharged and sprayed onto the upper surface of the filter medium 1. The filter medium 1 is a liquid pump with high self-priming ability,
The interior is kept in a reduced pressure state via a pipe 16 and a hollow rotating shaft 4 using a suction pump 15 such as a vacuum pump or an ejector, and is rotated gently in the direction of arrow A by the drive of a motor 12. The liquid content of the stock solution 31 sprinkled on the surface of the filter medium 1 passes through the filter medium 1 due to the suction action, and is discharged from the system through the hollow rotating shaft 4 as a liquid absorption hole through the pipe 16, while the solid content remains on the surface. Forms a stable cake-like layer. Cake-like layer solids content 18
is scraped and removed by the scraper 17, and at the same time the surface of the filter medium 1 is renewed at this portion. The stock solution tank 7 is a tank that receives the surplus stock solution 31, and has a structure in which the lower part of the filter medium 1 is accommodated, and when the stock solution 31 is present in this part, suction and separation are performed in the same manner. It's starting to become easier.

However, in such a solid-liquid separator,
The liquid component 32 sucked into the filter medium 1 cannot be drained to the outside until the liquid level reaches the level B shown in FIG. There was a problem in that the flow rate of the drained liquid could not be increased if the destructive operation was repeated. Also, even if the pressure is continuously reduced,
With the structure described above, the liquid and gas sucked into the filter medium 1 will be sucked at the same time.
There is a problem that the suction pump 15, which is the pressure reducing means, tends to pulsate, and it is difficult to stabilize the flow rate of the drained liquid.

(Purpose of the invention) This invention was created in view of the above-mentioned circumstances.The purpose of this invention is to be compact, have excellent ability to separate liquids and solids, and be able to suck liquids stably without causing pulsation. The object of the present invention is to provide a solid-liquid separator that can drain liquid.

(Summary of the invention) This invention consists of sealing both ends of a cylindrical filter medium made of a hard porous material with continuous pores with flanges connected to a rotating shaft, and rotating the filter medium while maintaining a reduced pressure inside. A solid-liquid mixed fluid containing many impurities is sprayed on the surface of the filter medium, and the liquid content is suctioned and removed by a pressure difference, thereby depositing the solid content in a layer on the surface of the filter medium. In a solid-liquid separator that separates the solid content and the liquid content by scraping off the deposited layer, the central part of one of the flanges is inserted, and one end is inserted vertically inside the filter medium. a nozzle positioned downward and close to the inner surface of the filter medium, the other end of which is held coaxially with the hollow rotating shaft and free from rotation of the hollow rotating shaft; and a nozzle connected to a pressure reducing means. and a fixed support supported by a rotary joint through which one end of the pipe is inserted and which slidably seals the hollow rotating shaft, and the nozzle generates the reduced pressure state and removes the liquid by suction. It was designed to encourage them.

(Example of the invention) Fig. 1 shows a cross-sectional structure in the circular axis direction of a solid-liquid separation section of a solid-liquid separator that is an embodiment of this invention, which is shown in correspondence with Figs. 2 to 5 above. 5, the same components as those in FIGS. 2 to 5 above are designated by the same numbers and their explanations will be omitted.

In FIG. 1, of the disk-shaped side plates 5A and 5B that seal the axial end faces of the filter medium 1, a midway portion of a hollow rotating shaft 40 is connected on the same axis as the center hole of the side plate 5A. A pulley 11 is provided in the drive wheel 14 of the reduction mechanism 13.
A belt 14A is wound between the deceleration mechanism 13 and the motor 12. On the other hand, a nozzle 60 serving as pressure reducing and liquid suction means is inserted into the space of the hollow rotating shaft 40.
The rear end portion is held coaxially with the hollow rotating shaft 40 and free from rotation of the hollow rotating shaft 40. Further, the hollow rotating shaft 40 is rotatably sealed and pivotally supported by a fixed support 70 into which the pipe 16 is inserted through a rotary joint at the end thereof. Nozzle 60 is thus in indirect communication with pipe 16 at this connection. The nozzle 60 is connected to a suction pump 15 (not shown) via the pipe 16, and is adapted to store the liquid component 32 sucked from the cylindrical chamber of the filter medium 1 in a container (not shown). Also, this nozzle 6
0 is provided so that its tip protruding from the hollow rotating shaft 40 into the filter medium 1 is always bent in the direction of the stock solution tank 7 (downward in the figure) and close to the inner surface of the filter medium 1, The nozzle 60 is held in the same position at all times by the action of gravity, regardless of the rotation of the hollow rotating shaft 40. That is, the nozzle 60 is mounted in the hollow rotating shaft 40 that rotates together with the filter medium 1, so that its tip is always directed toward the stock solution tank 7 (downward in the figure), regardless of the rotation of the filter medium 1 and the hollow rotating shaft 40. ) and close to the inner surface of the filter medium 1, and is designed to suck and drain only the liquid component 32 separated into the filter medium 1.

8 is connected to the stock solution tank 7 via an automatic valve (not shown) provided at the bottom of the stock solution tank 7.
Excess stock solution 3 out of surplus stock solution 31 received within
This is a circulation pipe that returns 1 to its original state.

To explain the outline of filtration in such a solid-liquid separator, an undiluted solution 3 is poured onto the surface of the filter medium 1 through the drainage hole 30.
1 is supplied, the pressure inside the filter medium 1 is reduced through the nozzle 60 by the suction force of the suction pump 15, and only the liquid component 32 of the stock solution 31 is sucked into the cylindrical chamber of the filter medium 1, and the solid content 18 is removed. It is deposited in a layer on the outer peripheral surface of the filter medium 1. The liquid component 32 sucked into the filter medium 1 and accumulated in the lower part of the inside thereof is discharged to an external container via the nozzle 60 and the pipe 16, and the solid content 18 accumulated on the outer peripheral surface of the filter medium 1 is removed by a scraper 17 provided along the side surface. The liquid is scraped into the container 19, thereby performing solid-liquid separation. That is, a drain hole 30 connected to a drain pipe of a cutting machine, a polishing machine, etc.
The stock solution 31 is discharged and sprayed onto the upper surface of the filter medium 1. The filter medium 1 is a liquid pump with high self-priming ability,
The interior of the filter is maintained at a reduced pressure state through a pipe 16 and a nozzle 60 using a suction pump 15 such as a vacuum pump or an ejector, and is rotated gently in the direction of arrow A by the drive of the motor 12. The liquid content 32 of the stock solution 31 spread on the surface of the filter medium 1 passes through the filter medium 1 due to suction action, accumulates in the lower part of the filter medium, and is discharged from the system through the pipe 16 through the nozzle 60 as a liquid absorption hole, and the solid content 18 is It remains on the surface and forms a stable cake-like layer, which is scraped off and removed by the scraper 17, and at the same time the filter medium 1
The surface of is updated in this part. The stock solution tank 7 is a tank that receives surplus stock solution 31, and has a structure in which the lower part of the filter medium 1 is accommodated, and the stock solution 3 is stored in this part.
If 1 is present, suction and separation are performed in the same manner.

(Modified example of the invention) In the above-described embodiment, an example was shown in which the filter medium 1 is rotated by rotating the hollow rotating shaft 40 through which the nozzle 60 is inserted. may simply be used as a rotation support shaft, and the rotation support shaft 2 provided on the opposite side thereof may be used as a rotation shaft to rotate.

(Effect of the invention) According to the solid-liquid separator of this invention, the nozzle as a pressure reducing/liquid suction means is provided with its tip inside the filter medium on the stock liquid tank side and close to the inner surface of the filter medium. Therefore, only the liquid components sucked into the filter medium are constantly sucked, and the liquid can be sucked and drained at a stable flow rate without causing pulsation. Furthermore, the nozzle not only stabilizes its liquid absorption properties but also stably maintains the reduced pressure inside the filter medium, resulting in excellent solid-liquid separation properties and shortening of processing time.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view in the circular axis direction showing one embodiment of the structure of the solid-liquid separation section of the solid-liquid separator of this invention;
The figure is an external perspective configuration diagram showing an example of a conventionally used solid-liquid separation device, FIG. 3 is a perspective view of the solid-liquid separation section, and FIG. 4 is a cross-sectional view in a direction perpendicular to the circular axis of FIG. 3. FIG. 5 is a diagram showing a cross section in the circular axis direction. 1... Cylindrical filter medium, 2... Rotating shaft, 4, 40...
...Hollow rotating shaft, 5A, 5B... Side plate, 7... Stock solution tank, 8... Liquid circulation pipe, 11... Pulley,
12...Motor, 13...Reduction mechanism, 14...Drive wheel, 15...Suction pump, 16...Pipe, 3
0...Drain hole, 31...Standard solution, 32...Liquid component,
60... Nozzle, 70... Fixed support.

Claims (1)

[Scope of utility model registration request] Both ends of a cylindrical filter medium made of a hard porous material with continuous pores are sealed with flanges connected to a rotating shaft, and the filter medium is rotated while maintaining a reduced pressure state inside, and the solid material containing many impurities is removed from its surface. The solid content is deposited in a layer on the surface of the filter medium by spraying a liquid mixed fluid and suctioning and removing the liquid content using a pressure difference, and the deposited layer is scraped off by a scraping device provided along the side surface. In the solid-liquid separator that separates the solid content and the liquid content, the central part of one of the flanges is inserted, and one end is vertically downward inside the filter medium and close to the inner surface of the filter medium. a nozzle whose other end is held coaxially with a hollow rotating shaft and free from rotation of the hollow rotating shaft;
A fixed support is provided, into which one end of a pipe connected to a pressure reducing means is inserted, and is pivotally supported by a rotary joint that slidably seals the hollow rotating shaft, and generates the reduced pressure state by the nozzle, and A solid-liquid separation device characterized in that the liquid portion is removed by suction.