JP4806737B2 - Filter - Google Patents

Description

  The present invention relates to a filter with an ultrasonic device that facilitates cleaning and filtration of the filter in a filter that filters liquid or the like through a filter formed in a cylindrical shape with metal or the like.

  Conventionally, synthetic resin or metal filters have been used for filtering liquids such as water. Recently, however, metal filters that can be regenerated due to problems such as waste disposal have been required. In the case of clogging caused by collecting foreign matter, metal filters use a regeneration method in which dirt is removed by rubbing the filter surface directly with a brush, etc., or cleaning is performed by applying external or internal pressure. It was.

  On the other hand, the above filter uses a tank-type ultrasonic cleaner that uses ultrasonic cavitation for cleaning, jet cleaning by water flow, or bubbling cleaning that generates bubbles in the liquid and cleans it. In addition to the methods, the above-described cleaning methods are appropriately used in combination to remove dirt.

  In the conventional cleaning methods described above, the filter called the cartridge is removed from the casing called the filter housing, and only the filter is cleaned alone.

  However, in the case of clogging of the metal filter, all of the cleaning methods employ a mode in which the filter is removed from the housing and cleaned, so that, for example, a filter inserted in a pipe can be attached. It had to be removed from the parts, and it was cumbersome because it was indispensable for troublesome work.

  In view of this point, as a cleaning method that can regenerate the internal filter while the filter is attached to the pipe, a bubbling method that forcibly sends bubbles into the pipe to clean the inside of the filter has been put into practical use. However, there is nothing to see in the effect. The reason is that after repeating the cleaning several times by the hub ring method, it was indispensable to remove the filter from the pipe and disassemble it, and to clean the filter directly by brushing or the like.

  As mentioned above, to regenerate a metal filter more perfectly, it is ultimately necessary to remove the filter from its housing and clean it individually, even though it is significantly more cumbersome and cumbersome. It is currently recognized that it can be regenerated.

  On the other hand, in the field of the filter, in order to improve the filter performance, the structure of the filtration part is shifted from the cylindrical type shown in FIG. 1 to the pleated type shown in FIG. 2, and the filter mesh is further refined, Since high-performance types with a narrower angle and a larger filtration area have been used, new problems have arisen, such as increased filter density and increased clogging, and shorter filter operation time.

  The present invention has been made in view of the conventional technology and its problems taken to regenerate the filter of the filter described above, and focuses on the cleaning effect due to the ultrasonic cavitation phenomenon, and the filter remains installed in the pipe. It is an object of the present invention to provide a filter that can eliminate clogging by directly applying ultrasonic vibration to the filter to vibrate the filter itself.

The filter of the present invention made for the purpose of solving the above problems is a cylindrical filter screen made of a metal inner screen and steel fibers, a core base coupled to one end of the filter screen, A screen pipe coupled to the other end of the filter screen and provided with a fluid outlet, and one end coupled to the core base, the other end being spaced from the screen pipe, and the inside of the filter screen or Ri Do from the arranged metal Koapaipu outward periphery includes a filter cartridge covered with a casing, the core base, the horn of the ultrasonic transducer is coupled in terms of the belly of the ultrasonic vibrations, said screen pipe is supported by the casing at a point section of the ultrasonic vibration, and the ultrasonic Doko is characterized in that so as to impart longitudinal vibration and flexural vibration to the filter screen and / or the Koapaipu.

  The filter incorporating the ultrasonic device of the present invention assembles a bypass pipe in the pipe and inserts it into the pipe, and operates in the opposite direction to the normal filtration operation to clean the filter. In addition, during the normal filtration operation that operates in the forward direction, the filter itself can be intermittently excited (ultrasonic vibration) to crush the impure solid substance lump that becomes clogged. The result is that the clogging is substantially reduced and the filter life is extended.

  In the present invention, the tip of the horn of the ultrasonic vibrator is coupled to the core base coupled to the end of the filter screen in the filter so that the filter is cleaned by transmitting ultrasonic vibration to the filter. Therefore, it is possible to clean and regenerate the filter without removing the filter from the pipe at all, and because the configuration takes into account the antinode L and node M of the ultrasonic transducer, the ultrasonic vibration is effectively applied to the filter. The filter screen and / or core pipe is subjected to longitudinal vibration and flexural vibration, and an excellent cleaning / filtration effect is obtained.

First, a general form of a filter to which the present invention is applied will be described with reference to FIGS. FIG. 1 shows a cylindrical filter having a general structure, and FIG. 2 shows a recently popular pleated filter.
In the filter illustrated in FIGS. 1 and 2, a punching metal or woven metal mesh is formed on the outer periphery of a core 3 that is a core formed by a punched steel plate such as a punching metal in which a large number of holes are formed so that liquid can easily pass therethrough. A filter medium 1 (also referred to as a filter 1) wound in multiple layers is fixed, and plates 2 are provided at both ends of both members 3, 1.

  FIG. 3 is a diagram showing an example of a plan view of the pleated filter of FIG. 2, and FIG. 4 is a partial development view for explaining the detailed structure of the filter of FIG. 3. Here, in order to improve the filtration performance, The filter medium 1 (filter 1) is formed by sandwiching a fiber media 5 in which steel fibers are laminated between two inner screens 4 and 4 made of wire mesh, and the filter medium 1 is wound around the core 3. Fixed and formed.

Next, a configuration example of a filter in which the filter described with reference to FIGS. 1 to 4 is incorporated as a filter cartridge in a casing will be described with reference to FIG.
In FIG. 5, the filter comprising the cylindrical filter medium 1, the plates 2 and 2 at both ends thereof, and the core 3 installed between the two plates 2 and 2 as the core of the filter medium 1 can be replaced like a so-called cartridge. It is called a cartridge 6 (also called a filter cartridge). The cartridge 6 is fixed inside the filter housing 7 provided with the inlet A and the outlet B to the portions of the plates 2 and 2 via the packing P, and is configured as an example of a filter.

The basic configuration and vibration distribution in which the present invention is applied to the filter described with reference to FIGS. 1 to 5 will be described with reference to FIG.
A bolt tightening Langevin type vibrator 13 (hereinafter referred to as a vibrator 13) is fastened by a fastening bolt 11 with a horn 8 and a horn 10 so as to sandwich the piezoelectric element 9, and is integrated.
The vibrator 13 is connected to the cartridge 6 by a connecting screw 12 on the tip side of the horn 8 and the plate 2 ′ so that it can be removed in advance. 6 shows the vibration amplitude distribution C when the vibrator 13 is excited by the oscillator 14 and the stress distribution D representing the expansion and contraction of the metal, and the direction of the ultrasonic vibration at that time is the vertical direction indicated by the arrow E. It turns out that it is a direction (axial direction) vibration.

The filter of the present invention is an apparatus for cleaning the filter 1 (filter medium 1) by integrating the ultrasonic vibrator 13 in advance with the axial end face (plate 2 ') of the filter cartridge 6 as described above. is there.
In the present invention, in order to improve the transmission of ultrasonic vibration, a thick steel plate or the like is used for the core 3, and the pleated screen 4 constituting the filter 1 is closely attached to the core 3. By arranging in this manner, it is desirable that the cavity generated from the core 3 during ultrasonic vibration is more easily penetrated into the filter 1.
In this case, the horn 8 and the plate 2 ′ connected to the vibrator 3 by the connecting screw 12 and the filter 1 are joined so as to be completely integrated by continuous welding.

Next, a specific structure and vibration distribution showing the entire filter with an ultrasonic device of the present invention will be described with reference to FIG.
In FIG. 7, the vibrator 18 is integrated by sandwiching an electrostrictive element 15 between a horn 16 and a horn 17 and assembling them with fastening bolts 36. The vibrator 18 is housed in the vibrator case 29 and connected to the oscillator 32 through the power supply cable 30. In addition, in order to dissipate the heat generated by the vibrator 18 to the outside, the vibrator case 29 is provided with a heat radiation hole (not shown) and a cooling air cooling fan 31 is attached.

  In the filter cartridge 36 of FIG. 7, a core pipe 21 made of a punched steel plate is integrated with a core base 20 (corresponding to the plate 2 ′ of FIG. 6) by continuous welding I, and a filter screen 22 is pressed against the core pipe 21. It is attached so that it contacts closely. A screen pipe 23 coupled to the other end side of the filter cartridge 36 is disposed on the other end side (the side where the vibrator 18 is not provided) of the filter screen 22. The ends are mechanically separated so that ultrasonic vibrations are not directly transmitted through the gap H.

The outer periphery of the cartridge 36 is covered with a casing 27. That is, the casing 27 is attached from the front and back by a cap 26 provided with a liquid inlet F and outlet G and a base 28 for fixing the vibrator. In order to maintain airtightness, an O-ring 25, an O-ring 35 or the like is used for the contact surfaces of the cap 26, the base 28, the screen pipe 23 and the casing 27, and the casing 27 is connected to the cap 26 by bolts 33 and 34. And fixed to the base 28.
The cartridge 36 shows the vibration distribution of the amplitude waveform K illustrated in FIG. 7 by the ultrasonic vibration of the vibrator 18, and the maximum point of vibration called the antinode L of the vibration and the minimum point of vibration called the vibration node M. Will occur.

Here, the cartridge 36 is fastened to the vibrator 18 with a connecting screw 19 at a vibration antinode L so that the cartridge 36 can be replaced, and the opposite side (screen pipe 23) has a packing 24 at a vibration node M. It is supported by the cap 26 via. As a result, the screen pipe is restricted from moving in the radial direction and can move in the axial direction.
Thus, an example of the ultrasonic apparatus of the present invention, that is, an apparatus that performs ultrasonic cleaning without removing the filter is formed.

In the filter of the present invention, in order to improve the cleaning effect of the filter, vibration unevenness can be eliminated as much as possible by oscillating at a frequency twice to four times the fundamental oscillation frequency (see waveform K in FIG. 7). As an example of this, the amplitude distribution of ultrasonic vibration when oscillating at an oscillation frequency four times that of the same longitudinal vibration is shown in waveform J of FIG.
Thus, in the ultrasonic apparatus of the present invention, the entire cartridge 36 can be vibrated substantially uniformly by oscillating while alternately changing the oscillation frequency.

  On the other hand, in the filter of the present invention, when the thickness of the core pipe 21 is thinned, the vibration component in the deflection direction O (the direction extending or contracting in the entire radial direction, see FIG. 7) becomes stronger than the vibration component in the vertical direction. Therefore, a method of oscillating at the resonance frequency of the deflection component by changing the oscillation frequency can also be selected as one of the vibration modes that enhance the cleaning effect.

  The effect of the ultrasonic cleaning of the filter by the filter of the present invention is that, for example, the collected foreign matter (impure solid substance) entangled with the porous filter medium (filter) of the filter screen 22 of FIG. It can be done. In other words, with the recent advancement in filter field technology, the structure and material of the filter medium have become more complex and sophisticated, and the retention capacity of foreign matter to be collected has increased dramatically, making it possible to extend the life of the filter itself. It has not been sufficient to wash the foreign matter collected in a complicated manner in such a high-performance filter by brushing or a jet water flow that only provides a superficial effect. Therefore, by applying the ultrasonic device of the present invention, it has become possible to clean and regenerate the high-performance filter that has been difficult to clean and recycle as described above.

  In other words, ultrasonic cleaning generates cavitation in the liquid, and the cavitation action is transmitted to the filter using the liquid as a medium. The required cleaning effect can be obtained. In particular, the metal has good vibration transmission efficiency in the solid, but as a result of applying the ultrasonic device of the present invention to a stainless steel filter that is generally used as a filter material of a metal filter, a particularly excellent cleaning effect It was possible to confirm through the tests using other filters.

Next, FIG. 8 shows an example of a filter in which the mounting structure of the cartridge and the ultrasonic vibrator forming the filter of the present invention is the most ideal form.
In the configuration of the cartridge 37 illustrated in FIG. 8, a core base 39 and an inner cylinder core 40 on a substantially circular plate are integrally manufactured, and are brought into close contact with the inner cylinder core 40 to one end side of the pleated filter screen 41 (see FIG. 8). 8) is joined to the core base 39 by continuous welding or the like, and an outer cylinder core 42 is disposed so as to be in close contact with the outer periphery of the filter screen 41. One end side of the outer cylinder core 42 (The right side of FIG. 8) is integrally joined to the core base 39 by continuous welding or the like. 8, 43 is a floating screen pipe, H is a gap formed between the other end (tip) of the inner cylinder core 40 and the end face of the screen pipe 43, and K is a waveform of vibration distribution.

  In the filter screen 41 of FIG. 8, the ultrasonic vibration generated by the vibrator 38 is transmitted to the inner and outer cylinder cores 40 and 42 from both the inner and outer surfaces of the filter screen 41, and at the same time, the inner cylinder core. 40, the outer cylinder core 42 efficiently generates a cavity, which penetrates the filter screen 41 placed in a sandwich state with a space between the cores 40, 42, and is filtered. The foreign matter or impure solid substance that has entered the inside of the filter is peeled off by the ultrasonic vibration and cavitation and led out of the filter to clean the entire filter screen 41.

  The filter of the present invention is not limited to the metal filter described above, but also for a synthetic resin filter that is difficult to transmit ultrasonic vibrations. Therefore, as shown in the structural example shown in FIG. 9, an inner cylinder core 46 and an outer cylinder core 47 are integrally provided on a core base 45 to which a vibrator 44 is coupled, and the core 46 and 47 are combined. When formed in a filter to which the ultrasonic device of the present invention in a form in which the cartridge 48 is disposed by a resin filter, the ultrasonic waves can promote filtration and have a cleaning effect.

  That is, FIG. 9 shows an example of the structure of the ultrasonic device of the present invention when a synthetic resin filter is excited. An inner cylinder core 46 and an outer cylinder core 47 are integrated with a metal core base 45. Although the entire synthetic resin cartridge 48 is inserted into the space between the cores 46 and 47, there is no mechanical connection between the cores 46 and 47 and the cartridge 48. Here, the base 45 and the cores 46 and 47 are referred to as a core type horn 50.

  The core type horn 50 shown in FIG. 9 is fastened and integrated with the vibrator 44 and the connecting screw 51. However, the synthetic resin cartridge 48 is formed independently from the inner and outer cylinders of the core type horn 50. Since it is inserted into the space formed by the cores 46 and 47, it is not necessary to be mechanically integrated with the horn 50 side. However, in order to complete the seal between the casing (not shown) and the end face serving as the liquid entrance / exit, the casing is fixed to the casing while maintaining airtightness in the casing using a waterproof O-ring 49 or the like. And The distribution of ultrasonic vibration in the apparatus of FIG.

  In the filter of the present invention shown in FIG. 9, the synthetic resin cartridge 48 is sandwiched between the inner cylinder core 46 and the outer cylinder core 47 provided in the core type horn 50 in the liquid. When the ultrasonic vibration from the liquid is transmitted and penetrates into the filter material made of synthetic resin, and this ultrasonic oscillation is repeated, clogging occurs during filtration and the liquid passage rate starts to decrease. Due to the cavitation effect, the passage resistance of the liquid filter medium can be lowered. As a result, the fluidity is increased and the liquid can easily pass, so that the life of the filter medium is increased. Further, at the time of cleaning, the cleaning effect can be enhanced by the same principle as at the time of filtration by exciting the ultrasonic vibration to the horn 50 while causing the liquid to flow backward.

  In the prior art, in order to regenerate the metal filter, the filter must be taken out of the pipe together with the filter and then removed from the filter and washed, but in the present invention, the cartridge is directly attached to the cartridge. By applying ultrasonic vibration, there is an advantage that not only troublesome filter replacement / installation work is unnecessary, but there is no problem even if periodic inspection / exchange work is omitted. In the past, it was standard to remove the filter from the piping and remove the filter from the pipe and clean it, so that after the filter has been used for a certain period of time or the liquid passage efficiency has decreased. Since the procedure for replacing the filter was taken, it was necessary to accept some decrease in filtration performance and efficiency.

  On the other hand, an improved filter that increases the surface area of the filter medium in order to collect a large amount of foreign matter and extend the filter life, the filter itself has a complicated structure and a large foreign matter retention capacity. Therefore, in cleaning for removing collected foreign substances, which was performed at the time of replacing the filter, the dirt on the surface was brushed in advance or the inside of the filter was cleaned with an ultrasonic cleaner after pre-washing such as jet cleaning with water flow. However, the cleaning mode is complicated and time-consuming work is required, but the ultrasonic device of the present invention allows a large amount of foreign matter to be collected in the filter at an appropriate timing while being attached to the pipe. Therefore, regular ultrasonic cleaning can be repeated before the filtration effect decreases, so that not only foreign matter removal is simple and labor-saving, but also short-term support. By be repeated automatically washed with cycle, you can remove the impurities automatically before the foreign matter from penetrating deep into the filter medium, which also results in extending the filter medium life.

  The above is the effect of the present invention focused on removing clogged foreign matter from the filter. However, the filter of the present invention is incorporated into the filter and used as a unit, so The teasion phenomenon lowers the filtration resistance, and since ultrasonic vibration can be applied while being installed in the pipe, the application of this vibration during the filtration operation greatly contributes to the promotion of filtration efficiency.

  Since the present invention is as described above, it is possible to obtain the redundant effect of accelerating filtration in the filter medium (filter), cleaning the filter medium, and extending the useful life of the filter medium by ultrasonic vibration of one apparatus. An epoch-making effect can be obtained in which the maintenance and management work such as periodic inspection of the cartridge and replacement cleaning of the cartridge is greatly reduced.

FIG. 6 is a partially cut perspective view for explaining the basic structure of a conventional cylindrical filter. The partial cutaway perspective view for demonstrating the fundamental structure of the conventional pleat type filter. FIG. 3 is a cross-sectional plan view of the pleated filter of FIG. 2. FIG. 3 is an enlarged perspective view of a part of the pleated filter of FIG. 2. Sectional drawing of an example of the filter which incorporated the filter cartridge in the casing. FIG. 4 is an example of a filter according to the present invention, and is a cross-sectional view illustrating a combination form of a cartridge and a vibrator and a vibration waveform. Sectional drawing which shows the filter of this invention with the example of a vibration waveform. Sectional drawing which shows the example of the attachment state of the cartridge and ultrasonic transducer | vibrator in the filter of this invention with the example of a vibration waveform. Sectional drawing which shows the example which applied the filter of this invention to the filter made from a synthetic resin with the example of a vibration waveform.

1 Filter 2, 2 'plate 3 Core 6 Cartridge 8, 10 Horn 9 Piezoelectric element
11 Fastening bolt
12 Connecting screw
13 Ultrasonic transducer
14 Oscillator

Claims (1)

A tubular filter screen made of a metal inner screen and steel fibers;
A core base coupled to one end of the filter screen;
A screen pipe coupled to the other end of the filter screen and provided with a fluid outlet;
One end of which is coupled to the core base, the other end said with a gap between the screen pipes, Ri Do from said filter screen inside or arranged metal outside Koapaipu, the outer periphery is covered with a casing Equipped with a filter cartridge,
A horn of an ultrasonic vibrator is coupled to the core base at an antinode of the ultrasonic vibration , the screen pipe is supported by the casing at a point of the ultrasonic vibration , and the ultrasonic vibration The filter is characterized in that the child gives longitudinal vibration and flexural vibration to the filter screen and / or the core pipe.

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