JP2010069462A - Device for filtering fluid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a filter efficiency and a filtration accuracy with a filter by making a pressure and a flow suitable when glass paste which is a material to be filtered passes through the filter in case of filtering the glass paste by the filter. <P>SOLUTION: A device 1 for filtering a fluid removes by the filter 6 a foreign material contained in the fluid as a material to be filtered pooled in a storage tank. The fluid is glass paste, a pressure-feeding passage 4 pressure-feeding the glass paste from a storage tank 2 for supply to a storage tank 3 for receiving is provided, and a filtration part 7 in which the filter 6 is installed on the way to the pressure-feeding passage 4 is formed, and an oscillation-giving means 8 giving an oscillation to the filter 6 is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fluid filtering device, and more particularly to a fluid filtering device configured to remove foreign matter contained in a fluid as a material to be filtered by a filter.

  As is well known, a filter is usually used to remove foreign substances contained in the fluid to be filtered, but the filter is clogged simply by passing through the filter. In some cases, it may be difficult to remove foreign matters appropriately.

  As specific means for dealing with such a problem, for example, according to Patent Document 1 and Patent Document 2, as a basic configuration, a stock solution as a material to be filtered is stored in a filtration tank, and a box is placed in the stored stock solution. A filter device is disclosed in which a filter (filter body) is immersed and vibrations are applied to the filter body by a sound wave or an ultrasonic oscillator.

  In this type of filtration device, because the pipe is inserted into the filter body, the filtrate existing in the filter body is pumped through the pipe by the operation of the pump, and then stored in the filtrate storage tank. The filtrate obtained is used for actual use. In this case, since sound waves or ultrasonic vibrations are applied to the filter body, it can be expected that the filtration efficiency can be improved by reducing the occurrence of clogging.

Japanese Patent Publication No.51-26665 Japanese Patent Laid-Open No. 48-7356

  By the way, for example, glass paste applied to a glass substrate for plasma display (PDP glass substrate) often contains fiber-based foreign materials or metal-based foreign materials in its raw materials. If a film is formed on the surface of the glass substrate, it causes a problem such as an unreasonably thick film thickness due to foreign matters.

  Therefore, it is necessary to remove foreign matter using a filter for this type of glass paste, but this type of glass paste has special characteristics such as high viscosity similar to toothpaste. Therefore, using a conventional filtration device makes it difficult or impossible to properly remove foreign matter.

  Specifically, the filtration devices disclosed in Patent Documents 1 and 2 described above have a configuration in which the filtrate is pumped from the inside of the box-shaped filter body immersed in the stock solution in the filtration tank through the piping by the operation of the pump. As a result, the apparatus is large and complex. Moreover, if the stock solution is a glass paste, a very large suction force is required to pass the glass paste from the outside to the inside of the box-shaped filter body. The suction force is greatly insufficient, and there is a risk of causing a distribution hindrance due to clogging or the like. Therefore, the glass paste cannot smoothly pass a sufficient flow rate from the outside to the inside of the filter body, and the time required for the filtration is prolonged and the filtration efficiency is deteriorated. In addition, there is a limit to increasing the capacity of the pump in order to avoid such a situation, and even if the capacity of the pump is increased, a great waste occurs.

  In addition, with the configuration of the filtering device disclosed in each document, the filter can be given vibration only to sound waves and ultrasonic oscillators, and can only give small vibrations. Become. And even if it attaches a vibrator etc. to the wall part of a filtration tank in order to give vibration (for example, mechanical vibration etc.) different from this, after vibrating the whole filtration tank, vibration can be propagated to a filter body. It becomes necessary and it is extremely difficult or impossible to propagate such vibration, and the enlargement and complexity of the apparatus become even more remarkable.

  Regardless of these circumstances, as a filtration device for filtering this kind of glass paste, it is necessary to optimize the pressure for passing through the filter, pass the glass paste at a sufficient flow rate, and reliably remove foreign substances. The reality is that no measures have been taken for realization.

  In view of the above circumstances, the present invention, when filtering a glass paste as a material to be filtered with a filter, optimizes the pressure and flow rate when the glass paste passes through the filter, thereby improving the filtering efficiency and filtering accuracy by the filter. Is a technical issue.

  The present invention, which was created to solve the above technical problem, stores a fluid as a material to be filtered in a storage tank and removes a foreign substance contained in the fluid with a filter. The fluid is glass paste, and a pressure-feeding passage for pressure-feeding the glass paste from the feeding storage tank to the receiving storage tank is provided, and a filtration unit in which a filter is installed in the middle of the pressure-feeding path is formed. And it is characterized by having a vibration applying means for applying vibration to the filter. Here, the above-mentioned “feeding storage tank” and “receiving tank” are not limited to tanks installed in a fixed position, such as drums that can be placed in a fixed position and carried around. It is meant to include containers.

  According to such a configuration, the filter is not disposed in a single storage tank and the glass paste is filtered, but between the two tanks of the supply storage tank and the reception storage tank. A separate pressure-feeding passage that pumps the glass paste from the supply storage tank to the receiving storage tank is provided, and a filter is formed by installing a filter in the middle of the pressure-feeding passage. For example, mechanical vibration is applied to the filter. In order to do this, it is only necessary to apply the vibration to the filtration unit, and the configuration for applying the vibration is simplified. Moreover, since the filtration part is formed in the middle of the pressure-feeding passage, it is not necessary to form the filter in a box shape as in the prior art, and this not only simplifies the configuration for applying vibration to the filter, The surface of the filter through which the glass paste passes can be made a single surface, and the flow rate of the glass paste passing through the filter can be sufficiently secured without unduly increasing the pressure when passing through the filter. Efficiency and filtration accuracy are improved. Furthermore, since the vibration from the vibration applying means is sufficiently propagated to the filter through the filtration part in the middle of the pressure feeding passage, the glass paste has characteristics such as high viscosity similar to toothpaste. Therefore, it is possible to effectively avoid the flow hindrance caused by the filter clogging.

  In this case, it is preferable that the filter has a flat plate shape and is arranged so that the glass paste flow direction of the pressure-feed passage and the surface of the filter are orthogonal. In addition, it is preferable that the opening dimension (opening dimension) of a filter is 15-300 micrometers (further 18-100 micrometers).

  This simplifies the configuration of the filter itself and simplifies the installation configuration of the filter in the filtration unit, and allows an optimum layout for obtaining the foreign substance removing action of the filter.

  Moreover, it is preferable that the said pressure feed path is comprised so that glass paste may be pumped in a closed circuit.

  If it does in this way, it will not touch outside air while glass paste is pumping in a pumping passage, and the malfunction that the foreign material from outside air will mix in the glass paste under pumping does not arise.

  Furthermore, it is preferable that the pressure feeding passage has a light shielding property.

  In this way, defects due to light being applied to the glass paste being pumped through the pumping passage, such as oxidation, reduction reaction, discoloration, fading, curing of the resin in the paste, deterioration of the resin in the paste, etc. occur. Disappear.

  Moreover, it is preferable that the flow path area of the pressure-feed passage is increased at a site where the filtration part is formed.

  In this way, the area of the filter and the area of the flow path around it are larger than the flow area of other pumping passage portions, so the flow rate of the glass paste passing through the filter is effectively related to the pressure. It can be increased, and the filtration efficiency can be further improved.

  On the other hand, the vibration applying means may apply vibration in a direction along the surface of the filter, or may apply vibration in a direction orthogonal to the surface of the filter.

  If necessary, two types of vibration applying means for applying vibration in a direction along the surface of the filter and vibration applying means for applying vibration in a direction orthogonal to the surface of the filter may be provided.

  Furthermore, the vibration applying means is preferably configured to apply vibration having an amplitude of 1 to 10 mm and a period of 120 to 780 Hz.

  Thus, if the amplitude and period are in the above numerical range, sufficient and appropriate vibration is applied to the filter, and the flow rate of the glass paste passing through the filter is optimized while avoiding clogging and the like. Is planned.

  Moreover, it is preferable that the said vibration provision means provides a mechanical vibration. Here, “mechanical vibration” is distinguished from sound waves and ultrasonic vibration, and an air vibrator can be cited as a representative example of the vibration applying means for generating the mechanical vibration. A striking type or pendulum type vibrator other than the above may be used.

  If it does in this way, a characteristic desirable when filtering glass paste can be acquired as a characteristic of vibration given to a filter.

  The said structure WHEREIN: The said glass paste is suitable if it is apply | coated to the glass substrate for plasma displays.

  As described above, according to the present invention, since the filter part in which the filter is installed is formed in the middle of the pressure feeding passage, the filter for passing the glass paste is not only simplified, but also the structure for applying vibration is simplified. The surface of the glass can be made into a single surface, and the flow rate of the glass paste passing through the filter can be sufficiently secured without unduly increasing the pressure when passing through the filter, and the filtration efficiency and filtration accuracy are improved. Is planned. Furthermore, since the vibration from the vibration applying means is sufficiently propagated to the filter through the filtration part in the middle of the pressure feeding passage, the glass paste has characteristics such as high viscosity similar to toothpaste. Therefore, it is possible to effectively avoid the flow hindrance caused by the filter clogging.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following embodiments, a fluid filtration device used when a glass paste to be applied to the surface of a glass substrate for PDP is used as a material to be filtered will be exemplified.

  FIG. 1 is a schematic front view of a fluid filtration device according to a first embodiment of the present invention. As shown in the figure, the fluid filtration device 1 according to the first embodiment includes a feeding storage tank 2 for storing a glass paste before filtration, and a receiving storage tank for storing a glass paste after filtration. 3, a pumping passage 4 for pumping the glass paste from the feeding storage tank 2 to the receiving storage tank 3, and a pump 5 as a pumping source. A filtration unit 7 in which a filter 6 is installed is provided in the middle of the pressure feed passage 4, and vibration applying means 8 that applies vibration to the filter 6 is fixed to the outer periphery of the filtration unit 7. In this embodiment, an air vibrator that applies mechanical vibration is used as the vibration applying means 8.

  More specifically, the pressure-feeding passage 4 extends in the horizontal direction from the suction passage 9 for sucking up the glass paste stored in the feeding storage tank 2 from below and the upper end portion 9a of the suction passage 9 and is filtered. Inflow passages 10 and outflow passages 11 existing on both sides of the section 7 and a downflow passage 12 for flowing down the glass paste that has passed through the outflow passage 11, these passages 9, 10, 11, 12 are light-shielding pipes It is formed as an internal passage of (circular pipe).

  Furthermore, the connection part to the filtration part 7 of the circular pipe which forms the inflow passage 10, and the connection part to the filtration part 7 of the circular pipe which forms the outflow path 11 are each comprised by the flexible pipes 13 and 14. . Moreover, the filtration part 7 in the middle of the pressure-feed passage 4 is formed by fixing the outer peripheral ends of the two conical plate bodies 15 and 16 whose inner peripheral ends are connected to the flexible pipes 13 and 14, respectively. The outer peripheral end of the vertical filter 6 is fixed to the outer peripheral end. The flow passage area of the filtration unit 7 is larger than the flow passage areas of the passages 9, 10, 11, and 12.

  As shown in FIG. 2, the filter 6 has a circular flat plate shape, and the mesh 6 a has an opening size of 15 to 300 μm (18 to 40 μm in this embodiment). And the vibration provision means 8 is comprised so that the mechanical vibration of the direction along the surface of this filter 6 may be provided. The amplitude of the mechanical vibration applied to the filter 6 by the vibration applying means 8 is 1 to 10 mm and the period is 120 to 780 Hz (150 to 300 Hz in this embodiment). And since the pressure feed path 4 which installs the filter 6 in this way is comprised by the closed circuit, external air does not touch the glass paste which flows through the pressure feed path 4. FIG.

  According to the fluid filtration device 1 having the above-described configuration, the glass paste in the feeding storage tank 2 is sucked up through the suction passage 9 and then pumped into the inflow passage 10 by operating the pump 5. Then, the filter unit 7 is reached. In the filtration unit 7, mechanical vibration having an appropriate amplitude and period is applied to the filter 6 having an appropriate mesh size by the vibration applying unit 8, and therefore, clogging due to foreign matters contained in the glass paste is caused. The glass paste is filtered by the filter 6 after an appropriate flow rate adjustment without causing an unreasonable increase in pressure. In this case, the mechanical vibration applied to the filtration unit 7 is suppressed from propagating to other circular pipes due to the presence of the flexible pipes 13 and 14. Then, the glass paste that has been filtered by the filter 6 passes through the outflow passage 11, reaches the downflow passage 12, flows down the downflow passage 12, and is stored in the receiving storage tank 3.

  FIG. 3 is a schematic front view of a main part of the fluid filtration device 1 according to the second embodiment of the present invention. The fluid filtration device 1A according to the second embodiment is different from the fluid filtration device 1 according to the first embodiment described above in that vibration applying means 8A is installed on the side of the filtration unit 7A, and this vibration The mechanical vibration is applied in the direction orthogonal to the surface of the filter 6A by the applying means 8A. Other configurations (including the characteristics of the vibration applying means 8A) are the same as those of the fluid filtration device 1 according to the first embodiment described above. The installation location of the vibration applying means 8A is not particularly limited. For example, the vibration applying means 8A may be installed in a circular pipe that forms the inflow passage 10A by eliminating use of the flexible pipes 13A and 14A.

FIG. 4 is a schematic front view of the fluid filtration device 1 according to the third embodiment of the present invention. The fluid filtration device 1B according to the third embodiment is different from the fluid filtration device 1 according to the first embodiment described above in that the glass paste stored in the storage tank 2B is fed by the pump 5B. An inflow passage 10B (also serving as a suction passage 9B) that is pumped to the filtration portion 7B is disposed along the vertical direction, and a maximum flow passage area portion inside the filtration portion 7 provided with the vibration applying means 8B. And the filter 6B are in a horizontal posture perpendicular to the upstream and downstream direction of the inflow passage 10B, and the downflow passage 12B reaching the receiving storage tank 3B also serves as the outflow passage 11B. Also in this case, the vibration applying unit 8B is configured to apply mechanical vibration in a direction along the surface of the filter 6B, but as a configuration to apply mechanical vibration in a direction orthogonal to the surface of the filter 6B. Also good. In the example shown in the figure, the feeding storage tank 2B is installed at a position higher than the receiving storage tank 3B, but the inflow passage 10B (suction passage 9B) and the downflow passage 12B (outflow passage 11) are bent. For example, the feeding storage tank 2B and the receiving storage tank 3B may be installed at the same or substantially the same height.

  In the above embodiment, the glass paste applied to the glass substrate for PDP is used as a material to be filtered. However, other glass pastes, for example, glass pastes as low melting point glass used as an adhesive, or insulation for fluorescent display tubes Even when a glass paste such as a layer is used as a material to be filtered, the present invention can be similarly applied.

It is a principal part longitudinal front view which shows schematic structure of the fluid filtration apparatus which concerns on 1st Embodiment of this invention. It is a single-piece | unit perspective view which shows the filter which is a component of the fluid filtration apparatus which concerns on 1st Embodiment of this invention. It is a vertical front view which shows schematic structure of the principal part of the fluid filtration apparatus which concerns on 2nd Embodiment of this invention. It is a principal part longitudinal front view which shows schematic structure of the fluid filtration apparatus which concerns on 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluid filtration apparatus 1A Fluid filtration apparatus 1B Fluid filtration apparatus 2 Feed storage tank 2B Feed storage tank 3 Receipt storage tank 3B Receipt storage tank 4 Pumping passage 5 Pump 5B Pump 6 Filter 6A Filter 6B Filter 7 Filtration part 7A Filtration unit 7B Filtration unit 8 Vibration imparting means 8A Vibration imparting means 8B Vibration imparting means 9 Suction passage (component of pressure feed passage)
9B Suction passage (component of pressure feed passage)
10 Inflow passage (component of pressure feed passage)
10A Inflow passage (component of pressure feed passage)
10B Inflow passage (component of pressure feed passage)
11 Outflow passage (component of pumping passage)
11B Outflow passage (component of pressure feed passage)
12 Downflow passage (component of pressure feed passage)
12B Downflow passage (component of pressure feed passage)

Claims (10)

In the fluid filtration device configured to store the fluid as the material to be filtered in the storage tank and to remove the foreign matter contained in the fluid with a filter,
The fluid is a glass paste, and a pressure-feeding passage for pressure-feeding the glass paste from the feeding storage tank to the receiving storage tank is provided, and a filtration unit in which a filter is installed in the middle of the pressure-feeding path; and A fluid filtering device comprising vibration applying means for applying vibration to the filter.   2. The fluid filtration device according to claim 1, wherein the filter has a flat plate shape and is disposed so that a glass paste flow direction of the pressure-feed passage and a surface of the filter are orthogonal to each other.   The fluid filtration device according to claim 1, wherein the pressure feeding passage is configured to pressure-feed glass paste in a closed circuit.   The fluid filtration device according to claim 1, wherein the pressure feeding passage has a light shielding property.   5. The fluid filtration device according to claim 1, wherein a flow passage area of the pressure-feed passage is increased at a site where the filtration unit is formed.   The fluid filtering device according to claim 2, wherein the vibration applying unit is configured to apply vibration in a direction along a surface of the filter.   The fluid filtering device according to claim 2, wherein the vibration applying unit is configured to apply vibration in a direction orthogonal to a surface of the filter.   The fluid filtering device according to claim 1, wherein the vibration applying unit is configured to apply a vibration having an amplitude of 1 to 10 mm and a period of 120 to 780 Hz. .   The fluid filtering device according to claim 1, wherein the vibration applying unit applies mechanical vibration.   The fluid filtration device according to claim 1, wherein the glass paste is applied to a plasma display glass substrate.

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