JP2006341166A - Filter apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter apparatus with good durability having good filtration efficiency and reverse washing efficiency. <P>SOLUTION: The filter device is provided with a pleated filter 31 formed to a cylindrical shape as a whole such that creasing of inner and outer sides of the pleat are aligned circumferentially respectively; and a pair of end plates 71, 72 made of elastic material which keeps both ends of the filter 31 buried by a predetermined depth respectively and which are integrally fixed to the ends. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a filter device used for removing sludge from a cutting fluid of a machine tool, for example.

  This type of device includes a pleat filter formed in a tubular shape as a whole so that the inner and outer folds of the pleat are arranged along the circumferential direction, and a pair of metal ends bonded to both end faces of the filter, respectively. 2. Description of the Related Art There are known ones that include a plate and a punching metal reinforcing cylinder having a double inner / outer structure that covers a filter from inside and outside.

  As the filtrate passes through the filter, the filter is elastically deformed. Therefore, the filter may be peeled off from the end plate, so that the filter device cannot be used. This type of filter device is disposable and has a high consumable cost.

  Since the filter is covered from inside and outside with the reinforcing cylinder, the opening area of the filter is narrowed, and the filtration efficiency is poor. Also, in this type of filter device, every time a certain period of time elapses, backwashing liquid is poured from the inside of the filter and backwashed, and sludge is stripped from the filter. It is also. Furthermore, it is difficult to apply the pressure necessary for backwashing even if the backwashing liquid is gently poured into the inside of the filter.

  An object of the present invention is to provide a filter device that has good durability and good filtration efficiency and backwashing efficiency.

  The filter device according to the present invention includes a pleat filter that is formed in a cylindrical shape as a whole so that the inner and outer folds of the pleat are aligned along the circumferential direction, and both ends of the filter are embedded to a predetermined depth and are the same end And a pair of end plates made of elastic material fixed integrally with the portion.

  In the filter device according to the present invention, since both ends of the filter are respectively embedded and fixed in the end plate, the filter is difficult to peel off from the end plate, and the durability is good. Therefore, since a thing like a reinforcement cylinder is not required, filtration efficiency and backwashing efficiency are favorable.

  Further, the both end plates are each formed in an annular shape extending along the cylindrical circumferential direction formed by the filter, and the apparatus body is provided with a pair of opposed annular holding grooves into which the both end plates are respectively inserted. In addition to the fact that the end plate is made of an elastic material, the end plate acts as a seal member and improves sealing performance. In addition, the end plate is supported from both the inside and outside, thereby improving the strength of the filter. .

  In addition, the device body has a cylindrical main body having an outer peripheral surface in contact with the inner fold of the filter, and an annular communication passage is formed on the outer peripheral surface of the main body, and communicates with the communication passage. If the filtrate pipe is connected to the main body so that the filter is filtered, the filter is firmly supported from the inside by the part of the main body where there is no communication passage, and the entire passage of the filter is filtered by the communication passage. It can be carried out.

  Also, if an air pipe is connected to the main body so as to communicate with the communication passage, bubbles can be generated around the filter by causing compressed air to act on the filter through the communication passage. It works extremely effectively to eliminate filter clogging.

  According to the present invention, there is provided a filter device having good durability and good filtration efficiency and backwashing efficiency.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIG. 1, a cutting fluid circulation system of a machine tool is shown, and a filter device 1 is provided on the system.

  The cutting fluid circulation system includes a cutting fluid tank 11. A vertical partition plate 12 is provided in the cutting fluid tank 11, whereby the cutting fluid tank 11 is partitioned into a cleaning fluid tank 13 and a contaminant fluid tank 14. A cleaning liquid pipe 15 extends from the cleaning liquid tank 13 to the machine tool M. A first submersible pump 16 is provided at the inlet end of the cleaning liquid pipe 15. The pollutant pipe 17 extends from the machine tool to the pollutant tank 14. A circulation pipe 18 is connected to the pollutant tank 14. The circulation pipe 18 is provided with a centrifugal separator 19. A part of sludge contained in the contaminated liquid flowing in the circulation pipe 18 is removed by the centrifugal separator 19.

  The filter device 1 is arranged in the pollutant liquid tank 14 so as to be immersed in the pollutant liquid, and is connected to the clean liquid tank 13 by a filtrate pipe 21. A self-priming pump 22 is provided in the middle of the length of the filtrate pipe 21. A second submersible pump 23 is provided at the opening end of the filtrate pipe 21 in the cleaning liquid tank 13. A first on-off valve 24 for maintenance is provided between the filter device 1 and the second submersible pump 23 in the filtrate pipe 21.

  An air pipe 26 extending from the compressor 25 is connected to the filter device 1. The air pipe 26 is provided with a second on-off valve 27 for maintenance.

  As shown in detail in FIGS. 2 and 3, the filter device 1 includes a device body 31 and a pleated filter 32 held by the device body 31.

  The device body 31 includes a vertical cylindrical main body 41, a horizontal ring-shaped top cover 42 that is detachably attached to the upper end surface of the main body 41, and a horizontal that is detachably attached to the lower end surface of the main body 41. A ring-shaped bottom cover 43 is provided.

  An annular communication passage 51 is provided in the middle of the height of the outer peripheral surface of the main body 41. In the main body 41, the inlet end of the filtrate pipe 21 is located at the same height as the communication passage 51. The inlet end of the filtrate pipe 21 is connected to the communication passage 51 by four branch pipes 52 extending radially outward at equal intervals of 90 degrees from here. Further, the outlet end of the air pipe 26 is located at substantially the same height as the branch pipe 52, and this is also connected to the communication passage 51.

  The top cover 42 covers the entire upper end surface of the main body 41 and projects radially outward therefrom. A downward bent edge 61 is provided at the overhanging end of the top cover 42. A downward holding groove 62 is formed by the upper end portion of the outer peripheral surface of the main body 41, the protruding portion of the top cover 42, and the downward bent edge portion 61. The bottom cover 43 has a structure in which the top cover 42 is turned upside down, and has an upward bent edge 63. Similarly to the downward holding groove 62, an upward holding groove 64 is formed by the lower end portion of the outer peripheral surface of the main body 41, the protruding portion of the bottom cover 43, and the upward bent edge portion 63.

  The pleated filter 32 is manufactured by pleating an elastic material such as paper, fiber, and metal mesh. Is formed.

  An upper end plate 71 is fixed to the upper end portion of the filter 32, and a lower end plate 72 is fixed to the lower end portion of the filter 32. The upper end plate 71 is fitted in the downward holding groove 62, and the lower end plate 72 is fitted in the upward holding groove 64, respectively. The upper end plate 71 and the lower end plate 72 have the same structure.

  The method of fixing the filter 32 and the both end plates 71 and 72 is as follows. As the material of the end plates 71 and 72, liquid rubber or elastic resin (urethane that can be poured in liquid such as urethane rubber or silicon rubber) is adopted. The end portion of the filter 32 formed into a cylindrical shape is inserted into a cavity corresponding to end plates 71 and 72 of a mold (not shown), and in this state, the above material is poured into the cavity and solidified. As a result, both end portions of the filter 32 are embedded in the end plates 71 and 72 by a depth corresponding to the thickness thereof, and are fixed integrally with the end portions.

  Next, the operation control of the filter device 1 will be described with reference to FIG. First, at the start of operation, the second submersible pump 23 is operated. Then, the cleaning liquid in the cleaning liquid tank 13 is sent to the filter device 1, and the filter 32 is backwashed to eliminate clogging. The self-priming pump 22 is filled with the cleaning liquid. At the time of backwashing, the outer surfaces of the end plates 71 and 72 are pressed against the outer surfaces of the holding grooves 62 and 64, thereby ensuring the sealing performance between the outer surfaces. Next, the operation of the second submersible pump 23 is stopped and the self-priming pump 22 is operated. Then, the filtrate in the communication passage 51 is sucked up by the filtrate pipe 21, and the contaminated liquid outside the filter 32 is allowed to pass through the filter 32. At this time, the inner portion of the filter 32 is opened only at the communication passage 51, but the adjacent creases inside the pleats of the filter 32 are connected in series in the vertical direction. The liquid is filtered throughout in the height direction. When filtering, contrary to backwashing, the inner surfaces of the end plates 71, 72 are pressed against the inner surfaces of the holding grooves 62, 64, thereby ensuring a sealing property between the inner surfaces. . When a certain filtration time has elapsed, the self-priming pump 22 is stopped, the second submersible pump 23 is operated, and the filter 32 is backwashed.

  The cleaning liquid sent to the cleaning liquid tank 13 is sent to the machine tool M by the operation of the first submersible pump 16, but a part overflows the partition plate 12 and is returned to the dirty liquid tank 16.

  FIG. 5 shows a modification of the filter device 1. The filter device 1 according to this modified example lacks the one corresponding to the main body 41 of the device body 31 described above. Therefore, the filter 32 is open on both the inside and outside sides. The upper and lower openings of the filter 32 are closed by a top cover 42 and a bottom cover 43. The tip of the branch pipe 52 is opened inside the filter 32.

  FIG. 6 shows a further modification of the filter device 1 and is preferably applied to a large filter device 1. The filter device 1 according to this modification is obtained by adding a punching metal reinforcing tube 91 to the filter device 1 shown in FIG. The reinforcing cylinder 91 is applied to the filter 32 from the inside. The upper and lower end portions of the reinforcing cylinder 91 are embedded in the end plates 71 and 72 together with the filter 32 and are fixed integrally with the end portions.

It is a block diagram of the cutting oil circulation system of a machine tool including the filter apparatus by this invention. It is a vertical longitudinal cross-sectional view of the same filter device. It is the horizontal cross-sectional view. It is explanatory drawing of the driving | operation operation | movement pattern of the same filter apparatus. It is a longitudinal cross-sectional view equivalent to FIG. 2 of the filter apparatus by a modification. It is a longitudinal cross-sectional view equivalent to FIG. 5 of the filter apparatus by the further modification.

Explanation of symbols

26 Air pipe
31 Device body
32 filters
41 Main body
51 Connecting passage
62, 64 Holding groove
71, 72 End plate

Claims (4)

  The pleat filter is formed in a cylindrical shape as a whole so that the inner and outer folds of the pleat are aligned along the circumferential direction, and both end portions of the filter are embedded by a predetermined depth and are fixed integrally with the end portion. And a pair of elastic end plates.   The both end plates are each formed in an annular shape extending along a cylindrical circumferential direction formed by a filter, and the apparatus body is provided with a pair of opposed annular holding grooves into which the both end plates are respectively fitted. 2. The filter device according to 1.   The apparatus body has a cylindrical main body having an outer peripheral surface that is in contact with the inner fold of the filter. An annular communication passage is formed on the outer peripheral surface of the main body, and is communicated with the communication passage. The filter device according to claim 2, wherein a filtrate pipe is piped on the main body. The filter device according to claim 3, wherein an air pipe is provided in the main body so as to communicate with the communication passage.

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