JPH0810524A - Immersion suction type continuous filter for plate-shaped filter cylinder - Google Patents

Abstract

PURPOSE:To easily backwash a suspension by a screen of a plate-shaped filter cylinder to prevent the clogging due to the suspension, to continuously use the pleat-shaped filter cylinder for a long period of time to improve the filtering treatment efficiency of the suspension, and to reduce the filtering treatment cost of the suspension. CONSTITUTION:In a filter in which a filter cylinder is immersed in a liquid contg. a suspension to perform suction filtration, a pleat-shaped screen 1 is rolled up in the form of a cylinder to form a plate-shaped filter cylinder 5, and the pleat-shape filter cylinder 5 is installed in an original liquid tank 7, and also an air jetting pipe 15 is arranged adjacent to the inner surface of the screen 1 in the filter cylinder 5. The bottom part of the filter cylinder 5 is separated from the original liquid tank 7, and also the opening of the bottom part of the filter cylinder 5 and the bottom part of an air vent tank 9 are made to communicate with each other, and further the upper part of the air vent tank 9 and that of a treating liquid tank 18 are made to communicate with each other. A suction cylinder 20 connected to a suction means such as a pump 19 is installed in the treating liquid tank 18. During the suspension is filtered by the filter cylinder 5, pressurized air is jetted from an air jetting pipe 15 intermittently for a short time, causing the suspension on the outer surface of the screen 1 of the filter cylinder 5 to be backwashed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an immersion suction type continuous filtration device using a pleated filter tube, for example, a coolant waste liquid containing a suspension of chips, metal pieces, etc. discharged from a machine tool or the like. It is characterized in that these suspensions are continuously filtered from the above liquid.

[0002]

2. Description of the Related Art In recent years, particularly in cutting of metal, particularly in machining of a machining center, the number of revolutions of a cutting tool is tens of thousands of revolutions (rpm), which is an extremely high speed that is unprecedented in comparison with conventional metals. Is cutting.

A high-pressure coolant method is adopted in ultra-high-speed rotary cutting, but this method applies the coolant to a machining point of metal or the like at a high pressure (about 7 MPa) which is not inferior to ultra-high-speed rotation of a spindle or the like. Injects intensively to cool the cutting edge and the cutting metal surface effectively,
Suspended materials such as metal pieces are forcibly removed without being caught on the tool or the cutting metal surface.The purpose is to extend the life of cutting tools such as metal, and stabilize at higher speeds for a long time. The purpose is to efficiently perform the cutting of precision metal and the like.

However, the ultra-high speed rotary cutting process by the high pressure coolant method requires a high pressure and tens of thousands of revolutions (rpm).
In order to perform cutting processing of metal etc. with extremely high rotation, the suspension of cutting chips, metal pieces, etc. has a strong tendency to be miniaturized into needles, powders, fine particles, etc. , The screen-shaped filter tube is easily clogged with the suspension of metal pieces, etc., and the suspended fine particles and metal pieces etc. clogged in the screen-shaped filter tube are easily washed from the filter tube. It was difficult to do.

Conventionally, in order to filter a suspension of such chips and metal pieces, in order to increase the filtration area of the suspension, a filter cylinder in which a screen is folded in a pleated shape has been used. However, since this pleated filter cylinder has a structure in which the screen is folded in a pleated shape, suspended particles such as chips and metal pieces are easily caught on the folded screen, and clogging of the filter cylinder is short. Since this occurs in time, the suspension filtration process must be interrupted for a long period of time, the filtration device must be disassembled, and the pleated filter cylinder must be washed.

Since it is not easy to wash the suspended matter such as clogged chips and metal pieces from the filter tube, the clogged pleated filter tube is washed and discarded without being reused. Often uses a new pleated filter tube,
There is also a drawback that the filtration processing cost becomes high.

[0007]

DISCLOSURE OF THE INVENTION The present invention is intended to improve the above-mentioned drawbacks of the conventional immersion suction type pleated filter tube. While the pleated filter tube is used for filtering the suspension, , Pressurized air is jetted from the air jet pipe intermittently for a short time, and chips on the outer surface of the screen of the pleated filter cylinder are
By backwashing suspensions such as metal pieces, the pleated filter tube prevents clogging, and also prevents the air used for backwashing the screen of the pleated filter tube from flowing into the suction means such as a pump. Then, without interrupting the filtration process by the pleated filter tube, the pleated filter tube is continuously used,
The purpose is to improve the filtration treatment efficiency of the suspension and reduce the filtration treatment cost.

[0008]

DISCLOSURE OF THE INVENTION The present invention relates to a filter apparatus in which a screen is folded in a pleated shape in a filter device in which a filter cylinder is immersed in a stock solution containing a suspension of chips, metal pieces, etc. for suction filtration. A cylindrical filter tube into the stock solution tank and bring it close to the inner surface of the screen of this pleated filter tube,
An air jet pipe is provided, and the bottom of the pleated filter tube is partitioned from the stock solution tank, and the bottom opening of the pleated filter tube and the bottom of the air vent tank are communicated with each other. A suction cylinder connected to the upper part and connected to a suction means such as a pump is loaded in the processing liquid tank, and while the pleated filtration cylinder 5 is performing the filtration processing of the suspension, the suspension is intermittently short. It is characterized in that the suspension of chips, metal pieces, etc. on the outer surface of the screen of the pleated filter cylinder is backwashed by injecting pressurized air from the air ejection pipe for a certain period of time.

Further, according to the present invention, in the above-mentioned backwashing mechanism of the immersion suction type filtration device, a vase-shaped collecting cylinder having a liquid passage port on the lower side is fixed to the bottom of the stock solution tank, In the rising part of the liquid collecting cylinder, the hollow parts of the pleated filter cylinder are fitted at intervals, and a gap is formed between the rising part of the vase-shaped collecting cylinder and the inner surface of the screen of the pleated filter cylinder. A characteristic feature is that a ring-shaped air ejection pipe is arranged at the bottom of this gap to efficiently backwash the suspension from the screen of the pleated filtration cylinder.

[0010]

[Function] While the suspension of cutting chips, metal pieces, etc. is being filtered, it is applied at a pressure higher than the liquid passing pressure of the filtrate sucked from the outer surface to the inner surface of the screen of the pleated filter cylinder. Pressurized air is intermittently jetted from the air jet pipe for a short period of time to force the pressurized air to pass from the inner surface of the screen of the pleated filter cylinder to the outer surface of the pleated filter cylinder, which may be caught or stuck to the outer surface of the screen. Suspended matter suspended in the gap between the pleated screen and the pleated screen is backwashed while vibrating the screen to continuously use the pleated filter tube without causing clogging and also to backwash. The used air is deaerated in the air vent tank to prevent it from flowing into the suction means such as a pump.

[0011]

EXAMPLE A backwashing mechanism of an immersion suction type filtration device using a pleated filter cylinder of the present invention was used to remove a suspension of chips and metal pieces (hereinafter referred to as a suspension) discharged from a machine tool or the like. An example of a coolant waste liquid filtering device will be described. For example,
As shown in FIGS. 1 and 2, a stainless steel screen 1 having a fine mesh is folded into a pleat shape to form a fold portion 2, and the pleated screen 1 is rolled into a cylindrical shape, and both ends 3 of the fold portion 2 are , The pleated filter cylinder 5 is fixed by the elongated clip 4 having a U-shaped cross section.
To form.

The screen 1 is made of Saran (trademark) having a fine mesh and physical strength in addition to the above-mentioned stainless steel, and the screen 1 has a mesh size of 10 to 1000 mesh. The number of pleats is 10 to 200, and the pleat length of the screen 1 is 1
0-50 cm, screen 1 pleat width 0.3-3
cm is sufficient, and further, the outer diameter of the pleated filter cylinder 5 is 10 to 60 cm, and the inner diameter is 10 to 50 cm. It is sufficient that the above specific numerical values are the type and treatment amount of the coolant waste liquid, Suspension type and content, filtration rate,
It may be appropriately determined according to the conditions such as the purity of the filtered liquid.

As shown in FIG. 3, a stainless steel frame 6 may be fitted to the upper and lower ends of the pleated filter cylinder 5 to stabilize the structure of the pleated filter cylinder 5. In this case, A lid is attached to the frame body 6a, and a lower frame body 6b having an opening 8 is used.

The upper frame body 6a and the lower frame body 6b may be simply fitted into the pleated filter cylinder 5, but if necessary, the upper frame body 6a and the lower frame body 6b may be spring-loaded. Alternatively, the pleated filter cylinder 5 may be fixed by a connecting tool (not shown) such as a chain.

The pleated filter cylinder 5 is loaded into a stock solution tank 7 of a coolant waste liquid containing a suspension in a dipped state. The bottom part of the pleated filter tube 5 is partitioned from the stock solution tank 7 and the pleated shape. A structure in which the opening 8 at the bottom of the filtration cylinder 5 communicates with the bottom of the air vent tank 9 provided adjacently, for example, as shown in FIG. 4, a vase-shaped collection having a liquid passage port 10 on the lower side surface. The liquid cylinder 11 is fixed to the bottom of the stock solution tank 7, and the hollow portion 13 of the pleated filtration cylinder 5 is fitted into the rising portion 12 of the vase-shaped collection cylinder 11 with a space therebetween, and the pleated filtration cylinder is also fitted. It is desirable to attach the bottom of No. 5 to the piece 14 of the vase-shaped liquid collection tube 10 in a water-sealed state.

In addition to the vase-shaped collecting cylinder 11, a hollow shielding cylinder may be used. In addition, the bottom of the pleated filtration cylinder 5 is partitioned from the stock solution tank 7, and the pleated filtration cylinder 5 is used.
Any structure may be used as long as it has a structure in which the opening 8 at the bottom of the device communicates with the bottom of the air vent tank 9 attached adjacent thereto.

In the pleated filter cylinder 5, an air jet pipe 15 connected to a known pressurized air supply means such as a compressor (not shown) is arranged as close to the inner surface of the screen 1 as possible. By injecting pressurized air from the air ejection pipe 15, the suspension on the outer surface of the pleated screen 1 is backwashed.

The screen 1 of the pleated filter cylinder 5
When the distance between the inner surface of the air jet tube 15 and the air jet tube 15 is wide, the pressurized air jetted from the air jet tube 13 diffuses into the pleated filter cylinder 5, and the amount of air passing from the inner surface of the screen 1 to the outer surface falls, Since the effect of backwashing and removing the suspension on the outer surface of the screen 1 is not good, as described above, the air ejection pipe 15
Is preferably arranged as close to the inner surface of the screen 1 as possible.

For example, a gap is formed between the rising portion 12 of the vase-shaped collecting cylinder 11 and the inner surface of the screen 1 of the pleated filtration cylinder 5, and the air ejection pipe 15 is arranged at the bottom of this clearance. Then, the pressurized air jetted from the air jet pipe 15 does not diffuse into the pleated filter cylinder 5 and the liquid collecting cylinder 1
It can be said that this is the best structure because the entire surface can be passed from the inner surface of the screen 1 to the outer surface along the rising portion 12 of the screen 1.

As shown in FIG. 5, the air ejection pipe 15 is made of vinyl, which is a hollow ring-shaped pipe having an inner diameter of 3 to 10 mm and a large number of pores 17 having a diameter of 0.5 to 2 mm provided on the outer surface 16. Suitable, in addition to this, hollow type hairpin tube,
Comb tubes can also be used.

The inner diameter of the air ejection pipe 15 and the diameter of the small holes 17 are such that the type and treatment amount of the coolant waste liquid, the type and content of the suspension, the opening of the screen 1, the number of pleats, and the pleated filter cylinder 5 are different. It may be appropriately determined according to conditions such as the outer diameter, the inner diameter, the filtration processing speed, and the purity of the filtration liquid.

Referring to the opening ratio of the pores 17 of the air ejection pipe 15, in the usual case, 30 to 40% is sufficient, and the point is to define the total area of the openings of the pores 17 of the air ejection pipe 15. It may be smaller than the inner diameter area of the air ejection pipe 15 so that the suspension on the outer surface of the pleated screen 1 can be backwashed and removed by injecting pressurized air.

Furthermore, the upper part of the air vent tank 9 and the processing liquid tank 1
8 is communicated with the upper part of the processing liquid tank 18 and, for example,
A suction cylinder 20 connected to a suction means such as a pump 19 is inserted. The suction cylinder 20 is immersed in a coolant liquid which is a filtered treatment liquid in the treatment liquid tank 18, and the pump 19 is positioned on the liquid surface. As described above, the coolant liquid degassed in the air bleeding tank 9 is allowed to flow out of the filtering device from the liquid passage hole 21 of the suction cylinder 20 through the pump 19 as described above.

The suction cylinder 20 to be immersed in the coolant in the processing liquid tank 18 is made of stainless steel and has an outer diameter smaller than the inner diameter of the processing liquid tank 18, and a large number of liquids are passed through the bottom surface of the suction cylinder 20. As the suction means provided with the holes 21 and connected to the suction cylinder 20 and installed on the liquid surface, a known suction means such as an ejector may be used in addition to the pump 18 described above.

Explaining the filtration treatment of the suspension, first, a pleated screen 1 having a specific mesh and a pleat number (filtration performance) is selected according to the filtration treatment conditions of the coolant waste liquid containing the suspension. This is rolled into a cylindrical shape, and the folded end portions 3 that are overlapped with each other are fixed by an elongated clip 4 having a U-shaped cross section to form a pleated filter cylinder 5.

Next, the hollow portion 13 of the pleated filter cylinder 5 described above is fitted into the rising portion 12 of the vase-shaped liquid collection cylinder 11 fixed to the bottom of the stock solution tank 7 at intervals, and the pleated filter cylinder is fitted. The bottom part of 5 is the one part 14 of the vase-shaped collecting cylinder 11.
After being attached in a water-sealed state, the air ejection pipe 15 having a specific pipe inner diameter, a pore diameter of the fine pores 17 and a porosity is selected, and the air ejection pipe 15 is connected to the rising portion of the vase-shaped collecting cylinder 11. 1
2 and the inner surface of the screen 1 of the pleated filter cylinder 5 are inserted into the bottom portion of the gap to allow the coolant waste liquid containing the suspension to flow into the stock solution tank 7 so that the pleated filter cylinder 5 is almost completely removed. Immerse the whole in the coolant effluent.

Further, when the suction cylinder 20 connected to the suction means such as the pump 19 is inserted so as to be immersed in the coolant liquid which is the filtration treatment liquid in the treatment liquid tank 18, the pump 19 is activated. The suction force is transmitted to the pleated filtration cylinder 5 through the treatment liquid tank 18, the air vent tank 9, and the liquid collection cylinder 11.
Of the coolant waste liquid containing the suspension in the stock solution tank 7, only the coolant liquid is sucked into the pleated filter cylinder 5 through the screen 1 of the pleated filter cylinder 5, and at the same time, the suspension is removed from the pleated filter cylinder 4. Filter on the surface of screen 1 and mesh.

Then, the coolant in the pleated filter cylinder 5 is sucked into the liquid collecting cylinder 11 through the opening of the rising portion 12 of the liquid collecting cylinder 11, and the liquid passage port 1 on the lower side surface of the liquid collecting cylinder 11 is drawn.
From 0, it is sucked into the treatment liquid tank 18 through the air vent tank 9, is sucked from the liquid passage hole 21 of the suction cylinder 20 to flow out of the filtration device, and is stored for reuse.

When the above-described suspension filtration process is continued, the suspension in the coolant waste liquid adheres to the screen 1 of the pleated filter cylinder 5, is caught, or is not removed from the pleated screen. Since it enters into the gap, pressurized air is jetted intermittently for a short time from the air jet pipe 15 while continuing the filtration process, and the pleated filter cylinder 5 is forced toward the outer surface from the inner surface of the screen 1. The above-mentioned suspension is backwashed while vibrating the screen 1 to precipitate and remove it on the bottom of the stock solution tank 11.

The pressurized air jetted from the air jet pipe 15 has a pressure higher than the fluid pressure of the coolant liquid (filtration liquid) sucked from the outer surface to the inner surface of the screen 1 of the pleated filter cylinder 5. Need to fire. That is,
A pressurized air supply means is provided so that the pressurized air overcomes the fluid pressure of the coolant and is ejected from the inner surface to the outer surface of the screen 1 of the pleated filter cylinder 5 to remove suspended matter from the screen 1. It is necessary to set it, which allows the pleated filter cylinder 5 to be continuously used for filtration treatment of the suspension without causing clogging.

The conditions for setting the pressurized air supply means are as follows: the coolant pressure, the inner diameter of the air jet pipe 15,
It may be appropriately determined according to the pore diameter and the opening ratio of the pores 17, the composition of the coolant waste liquid, and the screen 1 of the pleated filter cylinder 5.

When pressurized air is jetted from the air jet pipe 15, air bubbles remain in the coolant liquid which is the filtering liquid in the pleated filter cylinder 5, so that the coolant liquid in which this air remains is released. When the air in the coolant is discharged into the atmosphere, the air in the coolant is deaerated and flows into the treatment liquid tank 18.

Therefore, since there is no air in the coolant liquid sucked from the liquid passage hole 12 of the suction cylinder 20 in the processing liquid tank 18, the air used in the backwash is mixed in the suction means such as the pump 19. It is possible to prevent this, and it is possible to prevent malfunction or failure of the suction means such as a pump.

[0034]

When the screen is pleated in order to increase the filtration area of the filter cylinder, the suspension is apt to be caught by the folded screen and the filter cylinder is easily clogged. By injecting pressurized air from the air ejection tube during the filtration process of suspended matter, the suspension can be backwashed easily and efficiently from the screen of the pleated filter tube, and the pleated filter tube can be used to wash the suspended material. It has an excellent effect that it can be continuously used for filtration treatment.

Further, according to the present invention, since air is not mixed in the coolant liquid sucked from the liquid passage hole of the suction cylinder in the processing liquid tank, air is not mixed in the suction means such as the pump, so that the pump etc. There is an advantage that it is possible to prevent malfunction or failure of the suction means.

Further, when the air ejection pipe is formed into a ring shape and the air ejection pipe is inserted between the inner surface of the screen of the pleated filter cylinder and the rising portion of the vase-shaped collecting cylinder, the screen of the pleated filter cylinder is removed. The backwashing of the suspension becomes more effective, the backwashing time can be shortened, and the compressed air supply means such as a compressor can be labor-saving and compact.

In the present invention, since the pleated filter tube is not clogged with the suspension, the filtration process is interrupted, the filtration device is disassembled, and the pleated filter tube is replaced with time and labor. It is possible to significantly improve the filtration treatment efficiency without requiring such a series of operations.

In the present invention, unlike the conventional case, the clogged pleated filter tube is discarded, and a new pleated filter tube is not used each time, so the running cost of filtration treatment of the suspension is reduced. Can be cheaper,
In addition, it is an excellent technology from an industrial point of view, as it does not generate industrial waste, does not require disposal costs, and meets the modern demands for effective use of resources.

[Brief description of drawings]

FIG. 1 is a plan view of a pleated filter cylinder of the present invention.

FIG. 2 is a side view of the pleated filter cylinder of the present invention.

FIG. 3 is a cross-sectional view showing a state in which a frame is fitted in the pleated filter cylinder of the present invention.

FIG. 4 is a cross-sectional view of an immersion suction type continuous filtration device for a pleated filter cylinder of the present invention.

FIG. 5 is an explanatory view showing an air ejection pipe of a ring-shaped pipe of the present invention.

[Explanation of symbols]

 1 Screen 5 Pleated Filter Cylinder 7 Undiluted Liquid Tank 9 Air Venting Tank 11 Vase-shaped Liquid Collecting Tube 12 Rising Part 15 Air Jet Tube 17 Pore 18 Treatment Liquid Tank 19 Pump 20 Suction Tube

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B01D 29/88 B23Q 11/10 Z B01D 29/06 510 F 29/42

Claims (2)

[Claims] 1. A filter device in which a filter tube is immersed in a stock solution containing a suspension of chips, metal pieces, etc. for suction filtration, and the screen 1 is folded into a pleated shape, and the pleated screen 1 is a cylinder. The pleated filter cylinder 5 is formed into a round shape and is loaded into the stock solution tank 7. The air ejection pipe 15 is connected to the pressurized air supply means in the vicinity of the inner surface of the screen 1 in the pleated filter cylinder 5. And the bottom of the pleated filter cylinder 5 is partitioned from the stock solution tank 7, and the bottom opening of the pleated filter cylinder 5 and the bottom of the air vent tank 9 communicate with each other. While the upper part of the tank 18 is in communication with the processing liquid tank 18, a suction cylinder 20 connected to a suction means such as a pump 19 is loaded, and while the pleated filtration cylinder 5 is filtering the suspension. , Intermittently, for a short time An immersion suction type continuous filtration device using a pleated filter cylinder that backwashes suspended matter such as chips and metal pieces on the outer surface of the screen 1 of the pleated filter cylinder 5 by injecting pressurized air from 15. 2. A vase-shaped collection cylinder 11 having a liquid passage port 10 on the lower side surface is fixed to the bottom of the stock solution tank 7, and a pleated filter is provided on the rising portion 12 of the vase-shaped collection cylinder 11. Tube 5
The hollow portions 13 are fitted at intervals to form a gap between the rising portion 12 of the vase-shaped collecting cylinder 11 and the inner surface of the screen 1 of the pleated filtration cylinder 5, and a ring-shaped tube is formed at the bottom of this clearance. An immersion suction type continuous filtration device using a pleated filter cylinder according to claim 1, wherein said air jet pipe 15 is provided.