Waste oil-water purification device

Abstract

The present invention relates to a wastewater purification device, and more specifically, to a wastewater purification device capable of removing foreign substances, such as metal powder contained in wastewater discharged from a metal cutting process, using a first filter and a second filter, and removing bacteria, etc., by generating microbubbles. According to the present invention, by supplying foreign substances (metal chips, lubricating oil) mixed in wastewater, the foreign substances can be effectively removed through the application of a multi-stage filter, and the decay of wastewater can be prevented by the application of microbubbles, thereby having the effect of improving the working environment and solving the odor problem caused by this.

Description

Technology Field

[0001] The present invention relates to a wastewater purification device, and more specifically, to a wastewater purification device capable of removing foreign substances, such as metal powder contained in wastewater discharged from a metal cutting process, using a first filter and a second filter, and removing bacteria, etc., by generating microbubbles. Background Technology

[0002] Machine tools currently in use in Korea (especially CNC lathes, machining centers, etc.) supply a large amount of cutting fluid (mainly water-soluble) to cool the workpiece and tool during cutting operations, and lubricating oil is supplied to the friction / feed parts of the machine to prevent wear. As the cutting fluid and lubricating oil circulate, small chips, cutting debris, and foreign substances generated during workpiece processing are mixed together, and most of the impurities settle at the bottom of the cutting fluid tank, where they corrode and decompose.

[0003] In addition, as the lubricating oil and cutting oil are mixed and circulated, the lubricating oil (oil) floats on top of the cutting oil (water-soluble) and blocks the supply of oxygen to the cutting oil, thereby promoting the decomposition of the cutting oil and impurities.

[0004] Currently, sludge cleaners used in industries such as machine tools use a method of filtering foreign substances contained in wastewater by generating a vacuum inside while simply applying a first filter.

[0005] Therefore, it is impossible to remove sludge of various sizes; only sizes larger than the first filter can be captured, and the wastewater is sent directly to a waste container or tank without any significant effect. Wastewater that has not undergone complete filtration is reused as is.

[0006] In addition, even when filters for removing foreign substances were installed in multiple stages, maximum filtration could not be achieved at each stage, and since the foreign substances were passed to the next stage almost intact, there was a problem of low filtration efficiency. Prior art literature

[0007] (Patent Document 0001) KR 10-2013-0110792 A(Patent Document 0002) KR 20-2019-0001874 U The problem to be solved

[0008] The present invention, aimed at solving the aforementioned problems, provides a wastewater purification device that can increase filtration efficiency by mixing and supplying foreign substances (metal chips, lubricating oil) mixed in the cutting fluid within a cutting fluid tank, removing foreign substances by passing them through cylindrical and flat filters in stages, and providing means to reduce the pressure inside the purification device.

[0009] In addition, the purpose is to provide a wastewater purification device that improves the working environment and addresses the odor problem caused by the decay of cutting fluid by applying microbubbles to wastewater from which foreign substances have been removed.

[0010] In addition, the purpose is to provide a wastewater purification device that prevents wastewater from stagnating inside the purification device by adjusting the size and position of the water passage holes formed in the first filter so that wastewater overflows when the water passage holes are blocked and filtration does not occur. means of solving the problem

[0011] The present invention, devised to solve the aforementioned problems, is a purification device for removing foreign substances contained in wastewater, comprising: an upper case (102) having an inlet (108) formed therein; a lower case (106) installed below the upper case (102) to communicate with the upper case (102) and having an outlet (110) formed therein; a chamber (113) having a space formed therein and including a pressure reduction means for lowering pressure; a first filter (114) installed inside the chamber (113); a second filter (116) installed inside the chamber (113) and installed below the first filter (114), one or more of which are installed; and a pump (120) for moving the treated water that has passed through the second filter (116) to the outlet (110).

[0012] The first filter (114) is characterized by comprising: a first support body (114a) having an open top surface and a partially open bottom surface, and a first water passage hole (114b) and a second water passage hole (114c) formed on the side; and a first filtration filter (114f) which is housed inside the first support body (114a), has an open top surface and a partially open bottom surface, and removes foreign substances from the wastewater.

[0013] The first water passage (114b) is formed in the area where the first filter (114f) is located and is a passage through which wastewater is discharged while passing through the first filter (114f), and the second water passage (114c) is a passage formed in the area where the first filter (114f) is not located, and is characterized in that the location of the second water passage (114c) is higher than the location of the first water passage (114b).

[0014] It is characterized by comprising: a second support member (116a) which is plate-shaped and has an open center; and a second filtration filter (116d) installed inside the second support member (116a) to remove foreign substances from the wastewater.

[0015] In a plurality of second filters (116) arranged vertically, the size of the pores of the second filter (116d) included in the upper second filter (116) is relatively larger than the size of the pores of the second filter (116d) included in the lower second filter (116).

[0016] It further includes a bubble generating device (122) installed between the pump (120) and the discharge port (110) to generate microbubbles and remove bacteria inside the wastewater.

[0017] It further includes a pressure regulating valve (112) installed in the upper case (102) or the lid (104) to discharge gas generated inside the chamber (113) and to lower the internal pressure.

[0018] A first opening (114e) is formed in the center or on one side of the bottom surface of the first support (114a), and the remaining area of ​​the bottom surface excluding the first opening (114e) forms a first bottom surface (114d), and a second opening (114h) is formed in the center or on one side of the bottom surface of the first filter (114f), and the remaining area of ​​the bottom surface excluding the second opening (114h) forms a second bottom surface (114g).

[0019] It further includes an intermediate filter (114i) inserted between the first opening (114e) and the second opening (114h), having a pore larger than the pore size formed in the first filter (114f).

[0020] The size (R3) of the intermediate filter (114i) is characterized by being larger than the size (R1) of the first opening (114e) and the size (R2) of the second opening (114h). Effects of the invention

[0021] According to the present invention, by supplying foreign substances (metal chips, lubricating oil) mixed in wastewater, the foreign substances can be effectively removed through the application of a multi-stage filter, and the decay of wastewater can be prevented by the application of microbubbles, thereby having the effect of improving the working environment and solving the odor problem caused by this. Brief explanation of the drawing

[0022] FIG. 1 is a perspective view showing the overall structure of a purification device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the internal structure of a purification device. FIG. 3 is an exploded perspective view showing the structure of the first filter and the second filter. FIG. 4 is an exploded perspective view showing the structure of the first filter. FIG. 5 is a partial perspective view showing the internal structure of the first filter in detail. FIG. 6 is a cross-sectional view showing the structure of the first filter. FIG. 7 is a perspective view showing the structure of the second filter. FIG. 8 is a conceptual diagram showing the process of wastewater moving in the second filter. Specific details for implementing the invention

[0023] Hereinafter, a "wastewater purification device" (hereinafter referred to as the "purification device") according to an embodiment of the present invention will be described with reference to the drawings.

[0024] FIG. 1 is a perspective view showing the overall structure of a purification device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the internal structure of the purification device, FIG. 3 is an exploded perspective view showing the structure of a first filter and a second filter, FIG. 4 is an exploded perspective view showing the structure of a first filter, FIG. 5 is a partial perspective view showing the internal structure of a first filter in detail, FIG. 6 is a cross-sectional view showing the structure of a first filter, FIG. 7 is a perspective view showing the structure of a second filter, and FIG. 8 is a conceptual diagram showing the process of wastewater moving in the second filter.

[0025] In the present invention, a first filter (114) is installed at the top inside the case, and a second filter (116) is applied in multiple stages at the bottom thereof to remove chips of various sizes. The first filter (114) and the second filter (116) can provide various types of filters depending on the type of foreign substance to be filtered, such as coarse powder, less coarse powder, fine powder, and ultrafine powder.

[0026] The purification device (100) of the present invention has a body composed of an upper case (102) and a lower case (106), and is equipped with a means for removing foreign substances inside.

[0027] The upper case (102) and the lower case (106) are designed to communicate internally with each other, and a passage may be formed internally so that wastewater can move under load.

[0028] An opening may be formed at the top of the upper case (102), and a lid (104) that can be opened and closed may be installed in the opening.

[0029] An inlet (108) is formed in the lid (104), and an outlet (110) is formed in the lower case (106). The inlet (108) is a passage through which wastewater to be purified flows into the interior of the purification device (100), and the outlet (110) is a passage through which the purified wastewater is discharged to the outside of the purification device (100). The inlet (108) may be installed in the lid (104) or the upper case (102), and the outlet (110) may be installed in the lower case (106) or the upper case (102). Separate valves or locking means may be installed in the inlet (108) and the outlet (110), and measuring means for measuring the amount of wastewater flow may be installed. In addition, it is desirable to install a foreign substance concentration measuring means to determine the purification efficiency of foreign substances.

[0030] It is preferable that the purification device (100) of the present invention maintains a vacuum or a near-vacuum state inside the case. To this end, the upper case (102) and the lower case (106) may be provided with a sealing means to maintain a sealed state during operation. During the operation of the purification device (100), a situation may occur where the internal pressure becomes abnormally high, causing a decrease in purification efficiency. In such cases, the gas generated inside must be discharged to lower the internal pressure, and for this purpose, a pressure regulating valve (112) may be provided.

[0031] The pressure regulating valve (112), installed on the upper case (102) or lid (104), opens when operated by a worker, thereby discharging gas inside the case to the outside. It is also possible to provide a pressure measuring means and an automatic opening and closing means so that the pressure measurement and gas discharge are performed automatically. The pressure regulating valve (112) is a means for controlling the pressure reduction inside the device during the operation of the purification device (100) to perform filtration work under optimal conditions.

[0032] A chamber (113) is installed inside the upper case (102) to form a certain space. The chamber (113) includes a pressure reduction means to maintain a state where the internal pressure is lower than the external pressure or is a vacuum. A pressure regulating valve (112) is connected to the chamber (113), and the pressure regulating valve (112) operates when the pressure inside the chamber (113) rises abnormally.

[0033] A first filter (114) is installed inside the chamber (113), and one or more second filters (116) are installed at the bottom of the first filter (114). When two or more second filters (116) are installed, they may be arranged in a zigzag shape to extend the flow path of the wastewater. Additionally, the size of the foreign substances being filtered can be changed by gradually changing the size of the pores of the multi-stage second filters (116).

[0034] Generally, the first filter (114) is manufactured in a cylindrical shape, but it may also be a rectangular prism or other shape. The second filter (116) is manufactured in a plate shape, but it may also be other shape.

[0035] As the wastewater passes through the first filter (114), a large amount of foreign matter is filtered out and discharged as sludge, and as it passes through the multi-stage second filter (116) below, all remaining foreign matter is also removed. The wastewater, from which most of the foreign matter has been removed while passing through the multi-stage second filter (116), passes through the treated water discharge pipe (118) and moves to the discharge port (110) by the pressure of the pump (120) and is discharged to the outside.

[0036] A bubble generating device (122) is installed between the pump (120) and the discharge port (110), and prevents the decay of wastewater by generating microbubbles to remove bacteria, etc., inside the wastewater.

[0037] The first filter (114) can be manufactured as a cylindrical or other three-dimensional structure and may consist of an external first support (114a) and an internal first filtration filter (114f). The top surface of the first support (114a) is open, and the bottom surface is partially open. Wastewater flowing into the interior of the first filter (114) through the open top surface is discharged through the filtration section formed on the side and the bottom surface, leaving only foreign matter inside the first filter (114).

[0038] The first filter (114f) is manufactured with a size and shape similar to the first support (114a), and may be configured as a cylinder with an open top surface, a rectangular prism, or various other shapes. Additionally, the first filter (114f) can be accommodated inside the first support (114a), and it is preferable that it has a size large enough to be in close contact with the inner surface of the first support (114a). However, the size and shape of the first support (114a) and the first filter (114f) may vary depending on the case, and the size and shape of the first support (114a) can be varied as long as it is large enough to accommodate the first filter (114f).

[0039] A first water passage hole (114b) and a second water passage hole (114c) are formed in the side filter portion of the first support body (114a). The first water passage hole (114b) is a wastewater passage formed in the area where the first filter (114f) is located, and wastewater from which foreign substances are filtered out in the first stage while passing through the first filter (114f) located inside can be discharged through the first water passage hole (114b).

[0040] The second water passage (114c) is a wastewater passage formed in an area where the first filter (114f) is not present, and is a water passage located higher than the top of the first filter (114f), and is a hole to prevent overflow. Since the second water passage (114c) is located higher than the first filter (114f), wastewater passing through the second water passage (114c) is discharged without filtration. The second water passage (114c) becomes a passage for wastewater as shown in FIG. 6 when the amount of wastewater inside the first filter (114) is too large and the wastewater overflows the first filter (114). In a state where there is too much wastewater, the pressure inside the purification device (100) may rise or the filtration capacity may be exceeded, causing an overload. In this case, it is preferable to divert the wastewater through the upper second water passage (114c) and send it to the second filter (116). By installing the second water passage (114c), damage caused by pressure or other problems that may occur inside the first filter (114) can be resolved when the inside of the first filter (114) is filled with sludge.

[0041] An intermediate filter (114i) may be installed between the first support (114a) and the first filtration filter (114f). The bottom surfaces of the first support (114a) and the first filtration filter (114f) are partially open. Typically, the center of the bottom surface is open, and a filtration section is formed in another part of the bottom surface. Preferably, the filtration section formed on the bottom surface has the same structure as the side filtration section or water passage hole of the first support (114a) or the first filtration filter (114f).

[0042] A first opening (114e) is formed in the center or on one side of the bottom surface of the first support (114a), and the remaining area of ​​the bottom surface excluding the first opening (114e) forms the first bottom surface (114d).

[0043] A second opening (114h) is formed in the center or on one side of the bottom surface of the first filter (114f), and the remaining area of ​​the bottom surface excluding the second opening (114h) forms a second bottom surface (114g).

[0044] It is preferable that the first opening (114e) and the second opening (114h) be formed above and below each other in the same or similar area. This allows wastewater to flow downward and pass smoothly through the first opening (114e) and the second opening (114h) simultaneously.

[0045] When the first filtration filter (114f) is inserted into the interior of the first support (114a), the first opening (114e) and the second opening (114h) can be positioned above and below each other. In this state, when wastewater flows into the interior of the first filtration filter (114f), most of the wastewater passes through the first opening (114e) and the second opening (114h) without filtering, so there is almost no filtration of foreign substances. To prevent the wastewater from passing through without filtration in this way, it is necessary to install separate filters in the first opening (114e) and the second opening (114h), and in the present invention, an intermediate filter (114i) is inserted between the first opening (114e) and the second opening (114h).

[0046] The diameter or size (R1) of the first opening (114e) and the diameter or size (R2) of the second opening (114h) are similar or identical to each other. And, the diameter or size (R3) of the intermediate filter (114i) is set to be larger than this (R1 ≈ R2 < R3). By doing this, the intermediate filter (114i) can block the first opening (114e) and the second opening (114h) while filtration is performed.

[0047] It is preferable that the intermediate filter (114i) has pores larger than the pore size formed in the first filtration filter (114f). The size of foreign substances filtered through the intermediate filter (114i) will be larger than the size of foreign substances filtered in the first filtration filter (114f).

[0048] One or more second filters (116) may be installed below the first filter (114) inside the chamber (113). As the wastewater passes through the first filter (114), primary filtration is performed, or the wastewater overflowing from the first filter (114) reaches the second filter (116) located below. The wastewater reaching the second filter (116) moves downward by gravity and passes through the second filter (116) in a vertical direction, where secondary filtration is performed by the filter installed inside.

[0049] The second support (116a) on the outside of the second filter (116) is configured in a plate shape or other shape, and a space of a certain size is formed inside. A step (116b) with a relatively high height may be formed on one side of the second support (116a). The step (116b) prevents wastewater from being stored to a certain depth.

[0050] The second support member (116a) has an open center, and a pair of protective nets (116c) are installed above and below the open center of the second support member (116a). A second filtration filter (116d) is installed between the pair of protective nets (116c). The second filtration filter (116d) filters out foreign substances as the wastewater that has fallen into the second filter (116) moves downward.

[0051] The first filtration filter (114f) and the second filtration filter (116d) can be appropriately adjusted according to the form of wastewater to be applied. That is, the size of the holes formed in the filter, the number of layers stacked, and the material of the filter can be varied in various ways. Typically, the filter can be made of materials such as a metal mesh filter, non-woven fabric, or carbon powder.

[0052] As illustrated in FIG. 8, wastewater reaching the second filter (116) passes through the middle second filter (116d) and goes down. During this process, foreign substances are removed. If a large amount of wastewater is introduced in a short period of time, or if the second filter (116d) is clogged with foreign substances, the wastewater may not be able to go down and may overflow over the step (116b). However, even if the wastewater overflows the step (116b), the middle part of the next stage second filter (116) is located below it, so the secondary filtration process is performed normally and the operation of the purification device (100) can continue.

[0053] In the present invention, sludge and wastewater are first sucked into the interior of the first filter (114), and sludge larger than the hole size (1 mm) of the first filtration filter (114f) is removed. Then, the remaining foreign substances are sequentially removed in the second stage at the multi-stage second filter (116) located below. Depending on the case, the hole size of the first filter (114) from the top can be 0.5 mm, the hole size of the first second filter (116) placed below it can be 0.1 mm, and the hole size of the second second filter (116) below it can be 0.05 mm. By configuring the holes so that the size decreases as they go down, large sludge or foreign substances can be filtered from the top, and progressively smaller foreign substances can be filtered. The material of such filters and the hole size can be changed according to the characteristics of the wastewater to be purified.

[0054] The wastewater (treated water from which most foreign substances have been removed) that has passed through the second filter (116) is collected in a collection plate formed at the bottom, and then reaches the pump (120) through the treated water discharge pipe (118) connected to the bottom of the chamber (113). The treated water moves to the bubble generating device (122) by the pressure generated by the pump (120). The pump (120) and the bubble generating device (122) are generally installed inside the lower case (106), but they may also be installed outside the case.

[0055] The bubble generating device (122) can generate microbubbles in the final stage of wastewater purification to sterilize the wastewater and treat various foreign substances in the liquid.

[0056] The bubble generating device (122) is a product that draws water from a bathtub or container into microbubbles through a hose and then discharges them through another hose, generating ultrafine oxygen bubbles using only water and air. During the process of the microbubbles being generated and then disappearing, they burst instantaneously, inducing an ultra-high temperature and ultra-high pressure state instantaneously, thereby generating thermal ultrasound beneficial to the human body and releasing a large amount of negative ions. According to experimental results conducted by the Korea Far Infrared Application Evaluation Research Institute, the microbubbles showed a high sterilization rate of 99% against E. coli, Pseudomonas aeruginosa, Salmonella, and Vibrio bacteria, and clinical tests conducted on patients with atopic dermatitis and skin diseases using this principle showed excellent results.

[0057] Microbubbles rise to the surface at a very slow speed of 0.1 cm / sec. At this time, many bubbles disappear before reaching the surface, and when they disappear, they perform the following functions.

[0058] 1) Generation of 40 KHz ultrasound

[0059] 2) High sound pressure of 140 dB

[0060] 3) Generation of instantaneous high heat of 4,000 ~ 6,000 ℃

[0061] Ordinary bubbles rise in water and burst at the surface, whereas microbubbles contract under pressure underwater, generating various forms of energy as they dissipate. Subsequently, in the final stage, microbubbles are generated using a microbubble generator and released externally, or they can burst internally before release, producing a sterilization effect.

[0062] The wastewater from which foreign substances have been removed in the first and second stages by the first filter (114) and the second filter (116) undergoes sterilization and additional filtration by microbubbles generated by the bubble generating device (122), and finally, the treated water from which most of the foreign substances have been removed is discharged to the outside of the purification device (100) through the discharge port (110).

[0063] Although preferred embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the technical configuration of the present invention described above may be implemented in other specific forms without altering the technical concept or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive, and the scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention. Explanation of the symbols

[0064] 100 : Purification device 102 : Upper case 104 : Lid 106 : Bottom case 108 : Inlet 110 : Outlet 112: Pressure regulating valve 113: Chamber 114: 1st filter 116: 2nd filter 118 : Treated water discharge pipe 120 : Pump 122 : Bubble generator

Claims

Claim 1 A purification device for removing foreign substances contained in wastewater, comprising: an upper case (102) having an inlet (108) formed therein for the wastewater to flow in; a lower case (106) installed below the upper case (102) to communicate with the upper case (102) and having an outlet (110) formed therein; a chamber (113) having a space formed inside and including a pressure reduction means for lowering pressure; a first filter (114) installed inside the chamber (113) to filter the wastewater first; a second filter (116) installed inside the chamber (113) and installed below the first filter (114) in one or more places to filter the wastewater that has passed through the first filter (114) secondarily; and a pump (120) for moving the treated water that has passed through the second filter (116) to the outlet (110); wherein the first filter (114) has an open top surface and a portion of the bottom surface A first support body (114a) that is open and has a first water passage hole (114b) and a second water passage hole (114c) formed on its side; and a first filter (114f) that is accommodated inside the first support body (114a), has an open top surface and a partially open bottom surface, and removes foreign substances from the wastewater.It is composed of, wherein the first water passage hole (114b) is formed in the area where the first filtration filter (114f) is placed and is a passage through which wastewater is discharged after passing through the first filtration filter (114f); the second water passage hole (114c) is formed higher than the position of the first water passage hole (114b) in the area where the first filtration filter (114f) is not placed and is a passage for discharging unfiltered wastewater bypass when the wastewater level rises due to blockage of the first filtration filter (114f); a first opening (114e) is formed in the center or on one side of the bottom surface of the first support body (114a), and the remaining area of ​​the bottom surface excluding the first opening (114e) forms the first bottom surface (114d); and on the bottom surface of the first filtration filter (114f), the first A second opening (114h) is formed at a position corresponding to the opening (114e), and the remaining area of ​​the bottom surface excluding the second opening (114h) forms a second bottom surface (114g), and between the first opening (114e) and the second opening (114h), an intermediate filter (114i) having a pore larger than the pore size formed in the first filter (114f) is disposed, and the second filter (116) is configured in a plate shape and includes a second support (116a) with an open center; and a second filter (116d) installed inside the second support (116a) to remove foreign substances from the wastewater.A wastewater purification device comprising a plurality of second filters (116) arranged vertically, wherein the pore size of the second filter (116d) included in the upper second filter (116) is relatively larger than the pore size of the second filter (116d) included in the lower second filter (116), the second support (116a) is plate-shaped, a space of a certain size is formed inside, and a step (116b) with a relatively high height is formed on one side of the second support (116a) to store wastewater, and the plurality of second filters (116) arranged vertically are arranged in a zigzag shape along the movement path of the wastewater. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 A wastewater purification device according to claim 1, further comprising a bubble generating device (122) installed between the pump (120) and the discharge port (110) to generate microbubbles and remove bacteria inside the wastewater. Claim 7 A wastewater purification device according to claim 1, further comprising a pressure regulating valve (112) installed on the upper case (102) or the lid (104) that opens and closes the upper opening of the upper case (102), for discharging gas generated inside the chamber (113) to lower the internal pressure. Claim 8 delete Claim 9 delete Claim 10 A wastewater purification device according to claim 1, characterized in that the size (R3) of the intermediate filter (114i) is larger than the size (R1) of the first opening (114e) and the size (R2) of the second opening (114h).

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