JP2007083133A - Filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter which is applicable for dispersion and crushing of a stock liquid containing extremely hard material particles such as barium titanate, realizing a longer life with higher wear resistance than ever. <P>SOLUTION: In the filter arranged on the way of piping sending the pressurized stock liquid to a jet nozzle through a pressurized means and dispersing and crushing the material particles in the stock liquid to diameters at least smaller than the diameter of the jet nozzle on the nozzle upstream side, a stock liquid flow passage is provided with a ring member made of cemented carbide and other member forming a gap of a narrower dimension then the predetermined jet nozzle diameter against the ring member to disperse and crush the material particles to smaller than the dimension of the gap. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to a filter device used on the upstream side of a nozzle, for example, when a raw material liquid such as a slurry liquid or a mixed liquid composed of different kinds of liquid is atomized, dispersed, emulsified and the like by high-pressure nozzle injection.

  As one of the methods for homogenizing a fluid such as atomization of material, emulsification or dispersion of fine particles, for example, a liquid (raw material liquid) containing material particles is used at a high pressure using a atomization apparatus as shown in FIG. A method is adopted in which high pressure is injected from the nozzle into the collision chamber by pressurizing with a plunger pump.

  In such a method, when the raw material liquid is ejected from a nozzle having a small diameter, the material particle diameter should be made small upstream of the nozzle so that the nozzle is not clogged, and preferably smaller than the jet nozzle diameter of the jet nozzle. I must.

  Therefore, an ultra-high pressure filter is installed upstream of the nozzle (collision chamber) to prevent clogging of the nozzle by making large particles fine. An example of such a filter is a wedge wire filter. This is a wire mesh filter made of a wire made of SUS stainless steel, and is a filter that disperses and pulverizes large-diameter particles by passing a raw material liquid through a mesh gap between wires (see, for example, Non-Patent Document 1). ).

  That is, if the particles contained in the raw material liquid are soft, the particles are crushed and dispersed only by passing through the mesh, but if the particles contained in the raw material liquid are relatively hard, the particles are The mesh is first bitten, and then is broken by the pressure difference before and after the mesh to eliminate the bite. Thus, since the wedge wire filter has a strong structure, it can be applied to relatively hard particles and can be applied to a high-pressure flow.

Internet <URL: http://www.onc.ne.jp/manabe/wedge.htm> “Wedge Wire Screen” manufactured by Manabe Industries Co., Ltd.

  However, even when the above wedge wire filter is intended for extremely hard particles such as barium titanate, when the hard particles pass through a narrow mesh at high speed, the filter surface is made of SUS wire constituting the mesh. However, the particles are worn or eroded by abrasion or erosion, and finally the large-diameter particles pass through the filter as it is, causing clogging of the nozzle.

  Further, even before wear or erosion occurs, in the raw material liquid containing extremely hard particles, the large-diameter particles bitten in the mesh of the wedge wire filter are not crushed indefinitely, or the time until pulverization is increased.

  In this case, the region in which the hard particles remain in the mesh expands, and the possibility that the wire is finally damaged by the pressure difference before and after the closed mesh increases. When such a situation occurs in the production line, the line is stopped each time, and it takes time to recover, such as removing and disassembling the filter, replacing the wedge wire, assembling the filter parts, and eliminating nozzle clogging. In the process of atomization or dispersion of the powder, the work efficiency is adversely affected and the final product productivity is lowered.

  In order to avoid such wire breakage and to obtain a longer-life filter, it is first considered to manufacture a cemented carbide filter that is resistant to erosion and abrasion. However, since the cemented carbide is a brittle material, it cannot be processed into a complicated shape, and the production of the wedge wire filter is difficult and unsuitable for practical use.

  In view of the above problems, the object of the present invention can also be applied to dispersion and crushing of raw material liquids containing extremely hard material particles such as barium titanate, and realizes a longer life with higher wear resistance than before. An object of the present invention is to provide a filter device that enables this.

  In order to achieve the above-mentioned object, the filter device according to the first aspect of the present invention is arranged in the middle of a pipe that feeds the pressurized raw material liquid to the injection nozzle through the pressurizing means, and the material particles in the raw material liquid are removed. In the filter device for dispersing or crushing, the first ring member made of a high-hardness member and the first ring member are separated from the first ring member and have a width smaller than the diameter of the injection nozzle of the injection nozzle. And a second member that forms a gap having a size, and the gap constitutes a raw material liquid flow path that disperses or pulverizes the material particles below the width.

  The filter device according to a second aspect of the present invention is the filter device according to the first aspect, wherein the second member is disposed inside the first ring member, and has an inner diameter of the first ring member. It is a ceramic ball having a small outer diameter.

  According to a third aspect of the present invention, there is provided the filter device according to the first aspect, wherein the second member is a second member disposed coaxially with the first ring member via a spacer. It is a ring member, and the gap is formed by the spacer between the adjacent first ring member and second ring member.

  In the filter device of the present invention, a spacer is formed between the first ring member and the ceramic ball as the second member, or between the first ring member and the second ring member. The gap formed between the nozzles is used as a raw material liquid flow path, and the gap size is made smaller than the jet nozzle diameter of the jet nozzle, thereby dispersing or crushing material particles having a diameter larger than the jet nozzle diameter to prevent clogging of the nozzle. Therefore, the shape of each member constituting the filter device does not require simple and complicated processing, and it is a cemented carbide that exhibits excellent wear resistance even when targeting extremely hard particles such as barium titanate. A ring member can be manufactured with ceramics, and there is an effect that the life of the filter device itself can be extended and the productivity can be improved.

  In the present invention, a gap formed between the first ring member and the second member separate from the first ring member is used as a raw material liquid flow path, and the gap is a predetermined smaller than the injection nozzle diameter of the injection nozzle. By setting the width dimension, the filter device prevents the nozzle clogging by dispersing or crushing the large-diameter material particles contained in the raw material liquid when passing through the gap.

  Thus, by making the main part of the filter device a simple shape called a ring shape, complicated processing is not required at the time of manufacture, and the first ring member is a high-hardness member excellent in wear resistance, specifically, Can be made of cemented carbide or ceramics. Therefore, even if the material particles to be processed are extremely hard, such as barium titanate, the wear and damage to the filter is greatly reduced compared to the conventional method, and a good particle dispersion and crushing process is achieved. As a result, the life of the filter device itself is extended, complicated work such as filter replacement and clogging due to damage is greatly eliminated, consumable parts costs are reduced, and work efficiency is improved, resulting in product productivity. Will also improve.

  As a specific configuration for forming a gap serving as the raw material liquid flow path between the first ring member and the second member in the present invention, the first ring member includes the first ring member. A configuration in which a ceramic ball having an outer diameter smaller than the inner diameter of the ring member is arranged as the second member can be mentioned as a simple one.

  In this case, although the first ring member and the ball require a certain degree of processing accuracy, since the shape is simple, the manufacturing is relatively easy, and even the first ring inner diameter and the smaller ball outer diameter are appropriate. If a sufficient accuracy is ensured, an extremely narrow annular gap corresponding to the injection nozzle diameter of the injection nozzle can be formed between both members.

  When the material particles contained in the raw material liquid are hard, even if the large-diameter particles are caught in the annular gap, they can be crushed by the collision energy of the raw material liquid flowing at high speed around, or before and after the biting particles. It is crushed and refined by the pressure difference. Therefore, in such an annular gap, the region in which the particles are stuck is not expanded, and the gap is not closed too much. Even if extremely hard particles pass through the annular gap together with the raw material liquid at high speed, the ball is made of a ceramic material or cemented carbide material such as silicon nitride or zirconia, and the first ring member is made of cemented carbide or ceramics. Therefore, there is almost no wear or erosion, and the life of the filter device is prolonged.

  The ceramic ball can be fixed in the first ring member by, for example, providing a ball receiver on the downstream side in the first ring member and pressing it with a spring or the like on the upstream side. At this time, by allowing the ball to rotate in accordance with the flow of the raw material liquid, the impact on the ball is mitigated, and wear and damage to the ball can be avoided.

  In addition, as another configuration for forming the gap, as the second member, there is a configuration in which another ring member is arranged in a coaxial direction via a spacer. That is, the second ring member is disposed adjacent to the first ring member, and the third ring member and the fourth ring member are arranged in the same direction in the coaxial direction according to the actual device configuration. What is necessary is just to set the number of members. For example, a plurality of ring members and spacers of the same shape can be alternately fitted on the outer periphery of the tubular shaft member, and a gap between adjacent ring members can be secured with a predetermined size depending on the axial dimension of the spacer.

  In this case, in the tubular shaft member, a plurality of through holes may be formed radially at equal angular intervals so as to communicate the gaps and the pipe flow paths at positions corresponding to the pipe flow paths and the gaps. Good. As a result, the raw material liquid is dispersed and crushed to a predetermined diameter or less when going from the outer circumferential direction of each ring member to the inner circumference through this gap, and is introduced into the flow path inside the cylinder from the through hole, and downstream of the shaft member. It flows out into the piping from the side end toward the injection nozzle.

  Therefore, the spacer has a shape that does not block the introduction of the raw material liquid from the outer peripheral side of the ring member to the inner peripheral side as much as possible in this gap. For example, one spacer is arranged in a fitted state per one ring member, and a spacer portion protruding by a predetermined dimension from the ring member in the fitted state hits another adjacent ring member, so that the other ring member The filter device can be configured to ensure a gap corresponding to the protrusion dimension between the protrusion and the protrusion. However, since the protrusion also closes the gap, the protrusion area maintains a uniform gap with respect to the entire circumference of the ring member. It suffices to make only a partial area that can. In particular, it is assumed that the opening of the through hole does not overlap the protrusion as much as possible.

  For example, when two spacer protrusions are provided for the entire circumference of the ring member, if at least three through holes are formed radially in the radial direction, one of the openings of the through holes is the protrusion. Even if it is blocked, the other two are not blocked.

  As described above, by adopting a configuration in which the raw material liquid is made to circulate to the outer peripheral side of the ring member, the stress distribution applied to the ring member becomes uniform, and the pressure difference between the inner side and the outer side of the ring member becomes smaller. The mechanical strength burden is reduced.

  The raw material liquid referred to in the present invention is not limited to the so-called slurry liquid of solid particles + liquid (solvent), but may be liquid particles such as oil + liquid (solvent). The liquid (solvent) may be water. The present invention is not limited to various solvents, and the filter device according to the present invention is effective in any case.

  As a first embodiment of the present invention, FIG. 1 shows a filter device in which a gap for dispersing and crushing the large-diameter particles is formed between a first ring member and a ceramic ball as a second member. Show. FIG. 1A is a schematic side sectional view showing the configuration of the filter device, FIG. 1B is a schematic front view seen from the raw material liquid inflow side (upstream side), and FIG. 1C is C in FIG. It is an enlarged view of a part.

  The filter device 1 includes a first ring member 3 made of cemented carbide and a ceramic ball in a filter chamber 9 provided in the center of a filter body 2 in which a raw material liquid flow path is formed along a central axis. 4 is arranged, and this filter part is fixed to the filter body 2 by bolting with a filter presser 8 from the downstream side.

  The ceramic ball 4 is positioned in the ring member 3 by a spring bias by a spring 6 from the upstream side with respect to the ball receiver 5 on the inner downstream side of the ring member 3. In such a filter device 1, when a high-pressure raw material liquid is introduced from the upstream side of the flow path, it collides with the filter portion in the filter chamber 9 and is extremely narrow between the ceramic ball 4 and the ring member 3. Passing through the annular gap Z, large diameter particles contained in the raw material liquid are dispersed and crushed into small diameters according to the width dimension of the annular gap during this passage, and then flow into the downstream flow path.

In this embodiment, the inner diameter of the ring member 3 made of cemented carbide is 13.14 mm, the ceramic ball 4 is made of silicon nitride, the outer diameter is 12.70 mm, and the width of the annular gap Z formed between the two members. Was 0.22 mm. If the gap Z is too small, the pressure loss at the filter portion increases, and the injection pressure is lowered when the raw material liquid is injected from the nozzle on the downstream side of the filter device 1. In this example, the opening area of the gap is 8.8 mm ² , which corresponds to the flow area of a circular pipe having a diameter of 3.3 mm, and the pressure loss is small.

  The filter device 1 according to the present example was arranged as an ultra-high pressure filter in the atomizer shown in FIG. 5, and the lifetime of the filter device in the barium titanate atomization treatment test was determined by the atomizer. In this test, raw slurry is fed into a chamber at 245 MPa and a flow rate of 8 kg / min by two high-pressure plunger pumps as pressure intensifiers, and opposing collisions are performed by injection with a nozzle diameter of 0.35 mm in the chamber. Here, the case where a wedge wire filter (mesh width 0.22 mm) is used is taken as a comparative example, and the results are shown in Table 1 below. The life of the filter device was determined when the gap reached 0.30 mm.

  As is clear from the results in Table 1 above, it was confirmed that the filter device according to this example has a longer life than the conventional one. This eliminates the need for frequent replacement of the filter device, reduces the cost of consumable parts, improves work efficiency, and results in improved product productivity.

  As a second embodiment of the present invention, a filter device composed of first to fourth ring members, wherein a gap for dispersing and crushing the large-diameter particles is formed between the ring members by a spacer. This case is shown in FIG. 2 (a) is a schematic front view of the filter device as viewed from the raw material liquid inflow side (upstream side), FIG. 2 (b) is an AA cross-sectional view of FIG. 2 (a), and FIG. It is a BB cross-sectional arrow view of these, (d) is an enlarged view of D section in (b).

  3A and 3B are schematic views showing the structure of the ring member and the spacer constituting the filter portion of the present embodiment, in which FIG. 3A is a perspective view when both members are separated from each other, and FIG. The side view in the case of being in a state, (c) is a perspective view in the case of being in a fitted state. FIG. 4 is an explanatory view showing the case where the filter portion is constituted by four ring members and spacers, and (a) is a side view showing the middle of sequentially attaching each ring member and spacer to the tubular shaft member. (B) is a side view which shows the mounting completion state of four ring members.

  The filter device 11 according to this embodiment includes a plurality of cemented carbide ring members in a filter chamber 19 formed in a substantially central portion of a filter body 12 in which a raw material liquid flow path is formed along a central axis. The filter unit 13 is mounted on the shaft member 15 via the spacer 14, and the filter unit is fixed to the filter body 12 by bolting with a filter press 18 from the downstream side.

  As shown in FIG. 3, the filter portion is sequentially attached to the shaft member 15 as shown in FIG. 4 with the annular spacer 14 fitted in each ring member 13. Protrusions 14 </ b> S formed at two locations on the periphery of each spacer 14 ensure a gap X having a predetermined width dimension with another adjacent ring member 13.

  In the shaft member 15, through-holes 17 communicating with the gap X and the in-pipe flow path 16 are radially radiated in the circumferential direction corresponding to the gap X along the axial direction when the ring members 13 and the spacers 14 are mounted. Is formed. Accordingly, in such a filter device 11, when the high-pressure raw material liquid is introduced from the upstream side of the flow path, the high-pressure raw material liquid passes through the gap X from the outer peripheral side of the ring member 13 in the filter chamber 19. It flows into the inside of the ring member 13, is introduced into the in-pipe channel 16 from each through hole 17, and flows out downstream. In the present filter device 11, when passing through the gap X from the outer peripheral side of the ring member 13, the large diameter particles contained in the raw material liquid are dispersed and crushed into small diameters according to the width dimension of the gap X.

  In this embodiment, four ring members 13 made of cemented carbide are mounted on a shaft member 15 via three SUS stainless steel spacers, and three gaps X are formed between adjacent ring members 13. And the width X of the gap X was 0.22 mm. Further, a total of nine through-holes 17 formed at each circumferential upper position of the tubular shaft member 15 were provided at three equal angular intervals.

The flow rate of the raw material liquid is defined by the flow path area of these three gaps X. The minimum flow path area is “19 mm × when the gap gap minimum diameter Y shown in FIG. 0.22 mm × π × 3 ”, which is 39.3 mm ² in this embodiment. This is about 4.5 times the flow path area of 8.8 mm ² when the filter portion is composed of the ring member and ceramic balls shown in the first embodiment. However, the pressure loss can be further reduced. In the case of the filter configuration in which the gap X is formed by the plurality of ring members 13 and the spacers 14 as in the present embodiment, the length of the protruding portion 14S of the spacer 14 is changed to change the gap width dimension, that is, the flow rate. The road area can be freely selected.

  Hereinafter, in the atomization apparatus shown in FIG. 5, the case where the filter apparatus 11 of the present embodiment is arranged as an ultrahigh pressure filter and the life of the filter apparatus is determined in the barium titanate atomization processing test is shown. Specific test conditions, comparative examples (wedge wire filter: mesh width 0.22 mm), and life criteria are the same as those in the first embodiment. The results are shown in Table 2 below.

  As is clear from the results in Table 2 above, it was confirmed that the filter device according to this example has a longer life than the conventional filter device as well as the filter device of Example 1, and can operate stably for 450 hours. . As a result, the trouble of replacing the filter device and the like is further reduced, the cost of consumable parts is reduced, and the work efficiency and the productivity of the product are further improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the filter apparatus by 1st Example of this invention, (a) is a sectional side view of this filter apparatus, (b) is a schematic front view seen from the raw material liquid inflow side (upstream side), c) is an enlarged view of a portion C in (a). It is a schematic block diagram of the filter apparatus by 2nd Example of this invention, (a) is a schematic front view seen from the raw material liquid inflow side (upstream side) of this filter apparatus, (b) is (a). A sectional view taken along the line AA, (c) is a sectional view taken along the line BB of (b), and (d) is an enlarged view of a portion D in (b). It is a schematic diagram which shows the structure of the ring member and spacer which comprise the filter part of 2nd Example, (a) is a perspective view in which both members are separated, (b) is a state in which the spacer is fitted to the ring member. (C) is a perspective view in the case of being in a fitting state. It is explanatory drawing which shows the case where a filter part is comprised with four ring members and spacers by 2nd Example, (a) is a side view which shows the middle of attaching each ring member and a spacer to a tubular shaft member sequentially. FIG. 8B is a side view showing a state where the four ring members are completely mounted. It is a schematic block diagram which shows an example of the atomization apparatus by which the filter apparatus in 1st, 2nd Example is arrange | positioned.

Explanation of symbols

1: Filter device 2: Filter body 3: Ring member 4: Ceramic ball 5: Ball receiver 6: Spring 8: Filter retainer 9: Filter chamber 11: Filter device 12: Filter body 13: Ring member 14: Spacer 14S: Spacer Projection 15: Tubular shaft member 16: In-pipe flow path 17: Through hole 18: Filter presser 19: Filter chamber Z: Gap (between ring member and ball)
X: Gap (between ring members)
Y: Minimum gap

Claims (3)

In the filter device that is arranged in the middle of the pipe that sends the pressurized raw material liquid to the injection nozzle through the pressurizing means, and disperses or crushes the material particles in the raw material liquid,
A first ring member made of a high-hardness member and a second ring member that is separate from the first ring member and forms a gap having a width smaller than the injection nozzle diameter of the injection nozzle with respect to the first ring member. With members,
The filter device characterized in that the gap constitutes a raw material liquid flow path for dispersing or crushing material particles below the width dimension.   2. The filter device according to claim 1, wherein the second member is a ceramic ball disposed inside the first ring member and having an outer diameter smaller than an inner diameter of the first ring member. The second member is a second ring member disposed coaxially with the first ring member via a spacer,
The filter device according to claim 1, wherein the gap is formed by the spacer between the first ring member and the second ring member adjacent to each other.

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