Collection device and collection device operation method

Abstract

To provide a collection device that reduces filter damage and enables good knock-off of collected matters collected by a filter without providing other power.SOLUTION: A collection device has: a substantially cylindrical filter for collecting collected matters; a casing for storing the filter; and a rotatably supported fluid injection nozzle. A rotary shaft of the fluid injection nozzle is positioned in a space inside the filter, and a direction of a bus line of the filter and the rotary shaft of the fluid injection nozzle are substantially parallel to each other. The fluid injection nozzle has a first shank, a coupling part, and a second shank, and has a hollow through which fluid can pass. The first shank is arranged at a position overlapping the rotary shaft, and the second shank is arranged at a position that does not overlap the rotary shaft. The second shank has a fluid injection port for injecting the fluid to the filter, and the fluid injection port is provided so that the fluid injection nozzle is rotated by action of the fluid injected from the fluid injection port.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] SUMMARY The present disclosure relates to a collection device capable of cleaning a collection material and a method of operating the collection device. [Background technology]

[0002] Environments in which materials are collected are generally classified into dry and wet environments. In a dry environment, a representative example of a material to be collected is powder. In particular, a dust collector is used for transporting powder, and a cylindrical bag filter is known as a collector for removing the collected material, which is dust. In addition, filters are also used in powder storage hoppers at the transport destination to adjust the pressure when transferring or discharging the powder. In a wet environment, examples of materials to be collected include slurry (powder) and foreign matter in the slurry. A collector is disposed during the transfer of the slurry, and a cylindrical cyclone filter is known as a collector for removing the collected material, which is powder and foreign matter. This type of filter is made of breathable woven or nonwoven fabric, breathable paper, etc., and as it becomes clogged with collected matter as it is used, it needs to be replaced periodically. In this case, from the viewpoint of resource saving and cost reduction, it is preferable to remove the powder adhering to the filter, clean it, and reuse it. As an example of a device that can meet such demand, Patent Document 1 discloses a filter cleaning device. In this filter cleaning device, compressed air is sprayed onto a filter, and the spray nozzle attached to the tip rotates as the compressed air is sprayed, thereby clearing clogging of the filter. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-156130 Summary of the Invention [Problem to be solved by the invention]

[0004] However, according to the inventors' research, in order to fully achieve the cleaning effect of the filter cleaning device disclosed in Patent Document 1, it is believed that it would be effective to move the cleaning nozzle up and down, but this would require additional power.

[0005] Furthermore, in Patent Document 1, compressed air is sprayed to clean the filter and remove the collected matter. However, there is a trade-off problem in that increasing the pressure of the compressed air increases the ability to remove the collected matter but increases filter damage, whereas decreasing the pressure of the compressed air reduces filter damage but decreases the ability to remove the collected matter. According to the present disclosure, it is possible to provide a collection device that reduces filter damage and enables materials captured on the filter to be effectively shaken off without the need for a separate power source. Also, according to the present disclosure, it is possible to provide a method for operating the collection device. [Means for solving the problem]

[0006] The present disclosure provides a collection device having a filter for capturing objects to be collected, a casing for housing the filter, and a fluid injection nozzle, The collection device is configured to brush off the collected matter captured on the filter by a fluid jetted from the fluid jet nozzle, The filter is generally cylindrical; The fluid ejection nozzle is rotatably supported; When the collection device is seen from the axial direction of the rotation shaft of the fluid injection nozzle, the rotation shaft of the fluid injection nozzle is located in the space inside the filter, a direction of a generatrix of the filter and a rotation axis of the fluid ejection nozzle are substantially parallel to each other; The fluid ejection nozzle has a first shaft portion and a second shaft portion, the first shaft portion and the second shaft portion are connected via a connecting portion, The first shaft portion is disposed at a position overlapping with the rotation axis, the second shaft portion is disposed at a position not overlapping with the rotation axis of the fluid ejection nozzle, the first shaft portion, the second shaft portion and their connecting portion are hollow so that the fluid can pass therethrough; the second shaft portion has a fluid ejection port for ejecting the fluid toward the filter; The fluid ejection nozzle is provided so that the fluid ejection nozzle rotates about the rotation axis of the fluid ejection nozzle by the action of the fluid ejected from the fluid ejection nozzle.

[0007] The present disclosure also provides a collection device having a filter for capturing objects to be collected, a casing for housing the filter, and a fluid injection nozzle, The collection device is configured to brush off the collected matter captured on the filter by a fluid jetted from the fluid jet nozzle, The filter is generally cylindrical; The fluid ejection nozzle is rotatably supported; When the collection device is seen from the axial direction of the rotation shaft of the fluid injection nozzle, the rotation shaft of the fluid injection nozzle is located in the space inside the filter, a direction of a generatrix of the filter and a rotation axis of the fluid ejection nozzle are substantially parallel to each other; The fluid ejection nozzle has a first shaft portion and a second shaft portion, the first shaft portion and the second shaft portion are connected via a connecting portion, The first shaft portion is disposed at a position overlapping with the rotation axis, the second shaft portion is disposed at a position not overlapping with the rotation axis of the fluid ejection nozzle, the first shaft portion, the second shaft portion and their connecting portion are hollow so that the fluid can pass therethrough; the second shaft portion has a fluid ejection port for ejecting the fluid toward the filter; In a cross section perpendicular to a line passing through the axis of the first shaft portion and passing through the center of the fluid ejection port, An intersection point where the cross section intersects with a straight line passing through the axis of the first shaft portion is defined as an intersection point A, and an intersection point where the cross section intersects with the axis of the second shaft portion is defined as an intersection point B, When the angle between the line connecting the intersection point A and the intersection point B and the line connecting the center of the fluid ejection port and the intersection point B is defined as an angle F, The fluid ejection port is located within the angle F range of 5 to 175° in the collection device. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a collection device that reduces filter damage and enables materials captured on the filter to be effectively brushed off without the need for a separate power source. [Brief description of the drawings]

[0009] [Figure 1] A diagram illustrating a collection device [Diagram 2] A diagram illustrating a collection device [Diagram 3] A diagram illustrating a collection device [Figure 4] A diagram illustrating a collection device [Diagram 5] A diagram illustrating a collection device [Figure 6] A diagram illustrating a collection device [Figure 7] A diagram illustrating a collection device [Figure 8] A diagram illustrating a collection device [Figure 9] FIG. 1 is a diagram mainly illustrating the second shaft portion 3. [Figure 10] Schematic diagram of a fluid ejection nozzle seen from the direction of the rotation axis of the fluid ejection nozzle. [Figure 11] Filter Schematic [Figure 12] FIG. 1 is a diagram illustrating a collection device of a comparative example. [Figure 13] FIG. 1 is a diagram illustrating a collection device of a comparative example. [Figure 14] FIG. 1 is a diagram illustrating a collection device of a comparative example. [Figure 15] FIG. 1 is a diagram illustrating a collection device of a comparative example. [Figure 16] FIG. 1 is a diagram illustrating a collection device of a comparative example. [Figure 17] FIG. 1 is a diagram illustrating a collection device of a comparative example. [Figure 18] FIG. 1 is a diagram illustrating a collection device of a comparative example. [Figure 19] FIG. 1 is a diagram illustrating a collection device of a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In the present disclosure, the description of a numerical range such as "XX or more and YY or less" or "XX to YY" means a numerical range including the lower and upper limits, which are the endpoints, unless otherwise specified. When a numerical range is described in stages, the upper and lower limits of each numerical range can be arbitrarily combined.

[0011] When the embodiments for carrying out the present disclosure are specifically illustrated with reference to the drawings, the dimensions, materials, shapes, and relative positions of the components described in the embodiments should be appropriately changed depending on the configuration of the members to which the disclosure is applied and various conditions. In other words, it is not intended to limit the scope of the disclosure to the following embodiments.

[0012] 1 and 2 are cross-sectional views for explaining the collection device. FIG. 1 is a cross-sectional view taken along the radial direction of the filter cylinder. FIG. 2 is a perspective view of the collection device from above in the axial direction of the nozzle rotation shaft, i.e., from the upper side of FIG. 1. The present disclosure relates to a collection device having a filter 4 for capturing collected matter, a casing 5 for housing the filter 4, and a fluid injection nozzle 100. The filter 4 is substantially cylindrical. The fluid injection nozzle 100 is supported rotatably, and for example, as shown in FIG. 1, the fluid injection nozzle 100 is supported by a rotation support part 6.

[0013] The collector captures the collected matter passing through the casing 5 with the filter 4. For example, in FIG. 1, an air intake blower (not shown) draws air from the space on the side of the fluid injection nozzle 100 in the casing 5 separated by the filter 4. Then, only clean air from the mixture of the collected matter and, for example, air is exhausted to the outside of the casing from the space formed by the inner wall of the casing 5 and the outside of the filter 4. Meanwhile, the collected matter is captured by the filter 4 and remains in the space formed by the inner wall of the casing 5 and the outside of the filter 4. Then, the collector brushes off the collected matter captured by the filter 4 with the fluid injected from the fluid injection nozzle 100.

[0014] When the collection device is seen from the axial direction of the rotation shaft of the fluid injection nozzle, the rotation shaft of the fluid injection nozzle 100 is located in the space inside the filter. For example, as shown in FIG. 2, when the collection device is seen from above in the axial direction of the rotation shaft of the nozzle, the center of the first shaft portion 1 that can correspond to the rotation shaft is located inside the cylindrical circle of the filter 4. The rotation shaft is preferably located approximately in the center of the cylindrical circle of the filter 4. The generatrix direction of the filter and the rotation shaft of the fluid injection nozzle 100 are approximately parallel. The generatrix direction of the filter is the generatrix direction (height direction of the cylinder / cylinder) when the filter is viewed as a cylinder, and is the up-down direction in FIG. 1.

[0015] In this disclosure, the term "approximately" refers not only to the case where the two are exactly the same, but also to a concept that includes an error or deformation to the extent that the effect is not impaired. For example, "approximately parallel" does not only mean completely parallel, but also means that the two are substantially parallel, and may include an error of a few degrees to the extent that the effect of the present disclosure is not impaired.

[0016] Moreover, the fluid ejection nozzle 100 has a first shaft portion 1 and a second shaft portion 3, and the first shaft portion 1 and the second shaft portion 3 are connected via a connecting portion 2. The first shaft portion 1 is disposed at a position overlapping with the rotation axis of the fluid ejection nozzle 100. For example, as shown in FIG. 1, the first shaft portion 1 coincides with the rotation axis of the fluid ejection nozzle 100 supported by a rotation support part 6.

[0017] On the other hand, the second shaft portion is disposed at a position that does not overlap with the rotation axis of the fluid ejection nozzle 100. For example, the second shaft portion is disposed so that a straight line passing through the axis of the second shaft portion is parallel to the generatrix of the filter, or the angle θA between the straight line passing through the axis of the second shaft portion and the generatrix of the filter is preferably 15° or less (more preferably 12° or less, and even more preferably 10° or less). More preferably, the axis of the second shaft portion and the generatrix are disposed so as to be approximately parallel. FIG. 1 shows an example in which the straight line passing through the axis of the second shaft portion and the generatrix of the filter are parallel.

[0018] The axis 8 of the second shaft portion, as shown in Fig. 9, refers to an axis passing through the center of the second shaft portion. Fig. 9 is a diagram mainly explaining the second shaft portion 3. Similarly, the axis 7 of the first shaft portion refers to an axis passing through the center of the first shaft portion. The axis may refer to, for example, the axis in the long axis direction and pass through the center of gravity of the shaft portion. The straight line passing through the axis 7 of the first shaft portion preferably substantially coincides with the rotation axis of the fluid ejection nozzle.

[0019] Furthermore, the angle (angle θB) between a line passing through the axis of the second shaft portion and a line passing through the axis of the first shaft portion is preferably 15° or less, more preferably 12° or less, and even more preferably 10° or less. It is preferable that the line passing through the axis of the second shaft portion and the line passing through the axis of the first shaft portion are approximately parallel, and more preferably parallel.

[0020] The first shaft portion 1, the second shaft portion 3 and the connecting portion 2 thereof are hollow so that the fluid can pass through, and the second shaft portion has a fluid ejection port 9 for ejecting the fluid to the filter (FIG. 9). Therefore, the fluid passes through the first shaft portion 1 and the connecting portion 2, moves to the second shaft portion 3, and is ejected from the fluid ejection port 9 provided in the second shaft portion 3. In at least one embodiment of the present disclosure, the fluid ejection nozzle is provided so that the fluid ejection nozzle rotates about the above-mentioned rotation axis due to the action of the fluid ejected from the fluid ejection port 9. For example, the fluid ejection nozzle 100 can rotate by ejecting the fluid from the fluid ejection port from the second shaft portion at an angle of at least a certain degree with respect to the filter.

[0021] Fig. 10 is a schematic view of a fluid ejection nozzle 100 seen from the direction of the rotation axis of the fluid ejection nozzle, for example, seen from the upper side of Fig. 9 in the direction of arrow R. In another embodiment of the present disclosure, a cross section 10 in Fig. 9 is viewed perpendicular to a line 7-2 passing through the axis 7 of the first shaft portion and passing through the center of the fluid ejection port 9. Fig. 10 shows the second shaft portion at the position of the cross section 10, but for convenience and understanding, the view is a perspective view in which the coupling portion 2 and the first shaft portion 1 are indicated by dotted lines. In this case, intersection 12 where cross section 10 passing through the fluid ejection port intersects with a line passing through axis 7 of the first shaft portion is defined as intersection A. Also, intersection 13 where cross section 10 passing through the fluid ejection port intersects with axis 8 of the second shaft portion is defined as intersection B. Angle F is the angle (narrow angle) formed by line 15 connecting intersection A and intersection B and line 14 connecting the center of fluid ejection port 9 and intersection B. In this case, the fluid ejection port 9 exists in a range where angle F is 5 to 175°.

[0022] The present inventors consider the reason why the effects of the present disclosure are realized as follows. In the present disclosure, the first shaft portion 1 is rotatably supported, and the second shaft portion 3 is disposed at a position not overlapping with the rotation axis of the first shaft portion 1. The fluid ejection nozzle 100 is characterized in that the fluid ejected from the fluid ejection port 9 of the second shaft portion 3 at an angle of at least a certain degree with respect to the filter 4 rotates. For example, the fluid ejection nozzle 100 rotates when the angle F is in the range of 5 to 175°. Due to the structure including the nozzle 9, the fluid ejection nozzle 100 can rotate due to the action of the fluid ejected from the fluid ejection port.

[0023] In this way, the fluid ejected from the fluid ejection port 9 of the fluid ejection nozzle 100 is at a certain angle relative to the filter 4, and a repulsive force is generated when the fluid hits the filter, so that part of the energy of the fluid ejected from the fluid ejection nozzle is converted into rotational force, and the fluid ejection nozzle rotates around the rotation axis of the first shaft portion 1.

[0024] The repulsive force generated by the collision with the filter 4 varies depending on the state of the collected matter adhering to the filter. That is, when a large amount of collected matter is adhering to the filter immediately after the start of the brushing, the repulsive force becomes large and the rotation of the fluid injection nozzle becomes faster. As a result, the energy given to the filter per unit time and unit area becomes small, and the collected matter is gradually brushed off while minimizing damage to the filter.

[0025] Thereafter, when the amount of collected matter adhering to the filter 4 becomes small, the repulsive force from the filter decreases and the rotation of the fluid injection nozzle slows down. Therefore, more of the fluid injected from the injection nozzle passes through the filter, making it possible to brush off more collected matter from the filter.

[0026] Such a change in the rotation speed of the fluid injection nozzle 100 can be achieved while the fluid injection pressure is constant, and there is no need to provide a separate transmission mechanism or separate power source. Therefore, the above structure improves the trade-off between filter damage and the ability to shake off collected materials, reduces filter damage, and enables the materials collected on the filter to be effectively shaken off without providing a separate power source.

[0027] As described above, the second shaft portion is not particularly limited in its configuration as long as the fluid injection nozzle 100 can rotate due to the action of the fluid injected from the second shaft portion 3 toward the filter 4. For example, even if the second shaft portion has a shape extending in the direction from the back to the front of the paper surface of FIG. 1, the injection nozzle can rotate due to the injection of the fluid from the injection port. Similarly, the second shaft portion may have a spiral structure or a corrugated structure. Preferably, the second shaft portion is substantially linear. Also, preferably, the first shaft portion is substantially linear. More preferably, the angle θA formed by the second shaft portion satisfies the above-mentioned range.

[0028] The angle F of the fluid ejection port described above is preferably 10 to 60°. When the angle F is 10° or more, the repulsive force of the fluid ejected from the fluid ejection port is sufficiently converted into the rotational force of the fluid ejection nozzle, thereby reducing damage to the filter. When the angle F is 60° or less, the distance from the fluid ejection port to the filter is shortened, the fluid is ejected to the filter more effectively, and the ability to remove deposits from the filter is further improved. The angle F is more preferably 15 to 50°, and even more preferably 20 to 45°.

[0029] It is preferable that the filter 4 is elastically deformed when fluid is injected from the fluid injection nozzle at a pressure of 0.7 MPa toward the filter 4. The pressure here is the pressure immediately before the fluid injection nozzle is connected, and is the pressure measured when the fluid injection nozzle is closed. The pressure is a gauge pressure. The fact that the filter is elastically deformed under the above conditions means that the filter is not made of a material such as a rigid metal. The filter having elastic deformation is easy to process, the filter area can be easily increased, and the filter can efficiently capture the target substances. For example, the filter material is preferably paper; cloth such as nonwoven fabric or woven fabric; resin such as natural resin or synthetic resin; or a mixture of these.

[0030] Further, the substantially cylindrical filter in this disclosure includes a shape as shown in Fig. 11, which is processed for the purpose of increasing the collection area. Fig. 11 is a view of the substantially cylindrical filter from above, that is, in the direction of the generatrix of the cylinder. Filter 4 can be obtained, for example, by folding a filter material such as paper in an accordion-like manner and connecting both ends to form a cylindrical shape. The outer circle and the inner circle of filter 4 in Fig. 11 indicate a frame that supports the accordion-folded filter.

[0031] Such a filter may be commercially available, for example, an antistatic filter for PiE·PiE-SDN·Mi (product name) manufactured by Amano Corporation. Therefore, "approximately cylindrical" does not necessarily mean a strict cylinder with a perfect circular cross section, but means a shape that is generally recognized as cylindrical, such as the filter in Figure 11. For example, the surface may have a sawtooth shape, as shown in Figure 11. Also, the cross section may be elliptical or egg-shaped, so long as it is generally cylindrical.

[0032] Moreover, the fluid injection nozzle preferably has a plurality of fluid injection ports spaced apart from one another. The arithmetic mean value C of the distance between the centers of the fluid injection ports (the distance C between the injection ports) is preferably 50 mm or less, more preferably 3 to 45 mm, and even more preferably 5 to 30 mm. By having a plurality of fluid injection ports and the distance between each of the injection ports being 50 mm or less, the fluid can be injected over a wider range of the filter surface, making it possible to more effectively brush off the collected matter from the filter.

[0033] Furthermore, it is preferable that 50 to 100% by number (more preferably 80 to 100% by number, and even more preferably 90 to 100% by number) of the multiple fluid ejection ports satisfy the above angle F. It is preferable that 50 to 100% by number (more preferably 80 to 100% by number, and even more preferably 90 to 100% by number) of the multiple fluid ejection ports are aligned in the same straight line. This is preferable from the viewpoint of making it easier to achieve both suppression of filter damage and ability to shake off collected material. The number G of fluid ejection ports in the fluid ejection nozzle may be changed according to the purpose of the device and is not particularly limited. For example, the number may be 1 to 5,000, 3 to 500, or 5 to 200.

[0034] In a fluid injection nozzle, the total area of ​​the fluid injection port is K (mm 2 ) is the axial cross-sectional area J (mm 2 ) is preferable. When the sum K of the areas of the nozzle injection ports is smaller than the axial cross-sectional area J of the second shaft portion, the amount of fluid injected from each injection port can be uniformly injected. By stabilizing the amount of fluid injected, the energy of the fluid injection can be converted into rotational energy more effectively, the nozzle rotation can be stabilized, and filter damage can be further reduced.

[0035] The sum K of the areas of the fluid ejection ports is, for example, the sum of the areas of the fluid ejection ports 9 in Fig. 9. The axial cross-sectional area J of the second shaft portion is, for example, the cross-sectional area of ​​the second shaft portion 3 which is a circle centered on the intersection point 13 in Fig. 10. For example, the ratio K / J is preferably from 0.30 to 0.99, more preferably from 0.40 to 0.90, and even more preferably from 0.50 to 0.80.

[0036] The total area of ​​the fluid ejection ports 9 present between the midpoint 11 in the longitudinal direction of the second shaft portion 3 and the joint portion is defined as L (mm 2 ) (FIG. 9). The total area of ​​the fluid ejection ports 9 existing between the midpoint 11 in the longitudinal direction of the second shaft portion and the end 21 (which is also the tip 21 of the second shaft portion) of the second shaft portion 3 located in the opposite direction to the joint portion 2 is defined as M (mm 2 ) (Figure 9). In this case, L (mm 2 ) is M(mm 2 ) is preferably smaller than

[0037] By satisfying the above relationship between L and M, it is possible to reduce instability in fluid ejection caused by pressure loss due to a larger ejection port area of ​​the fluid ejection port located farther from the fluid supply source, and to more suitably brush off the collected matter from the filter. For example, the ratio L / M is preferably 0.20 to 0.99, more preferably 0.30 to 0.90, and even more preferably 0.35 to 0.80.

[0038] When the ratio E / H of the rotation radius E (mm) of the fluid injection nozzle in Fig. 9 to the filter inner diameter H (mm) in Fig. 11 is X, and the original pressure (gauge pressure) of the fluid is Y (MPa), it is preferable to satisfy the relationship of the following formula (1). The rotation radius E is the distance from the rotation axis of the fluid injection nozzle to the axis of the second shaft portion in a cross section perpendicular to a line passing through the rotation axis of the fluid injection nozzle. When the second shaft portion is inclined, it is the distance from the rotation axis of the fluid injection nozzle to the intersection of the axis of the central axis of the joint portion and the axis of the second shaft portion in the cross section. The original pressure of the fluid is the pressure immediately before the fluid injection nozzle is connected, and is the pressure measured when the fluid injection nozzle is closed. Y>-0.67X+0.77 (1)

[0039] Equation (1) represents the relationship between the distance between the fluid injection nozzle and the filter and the fluid ejection. The farther the fluid ejected from the fluid injection nozzle is from the filter, the higher the fluid ejection ability is required to blow off the collected matter. When in the above relationship, the ability to blow off the collected matter collected on the filter is further improved, the change amount of the rotation speed is improved, and the filter damage is further reduced. In addition, as shown in FIGS. 3 and 4, when the shape is such that E < H, the outer radius of the filter is set to Imm, and X in Equation (1) is set to I / E. The rotation radius E (mm) of the nozzle may be changed according to the purpose of the collection device. For example, it is 10 to 100 mm, preferably 15 to 50 mm. Examples of the inner radius H of the filter include 10 to 2000 mm and 50 to 1000 mm. The outer radius I of the filter is, for example, 5 0 to 3000 mm and 100 to 2000 mm can be mentioned.

[0040] The fluid is not particularly limited, and known ones can be used. It may be selected according to the purpose of the collection device. For example, the fluid can be selected from gases such as air, oxygen, nitrogen, carbon dioxide, or a mixture of two or more of these; liquids such as water, organic solvents, or a mixture of two or more of these. Preferably it is air or water, and more preferably air. For example, compressed air can be used. In addition, the collected matter collected by the collection device is not particularly limited, and examples include powders such as toner and flour; slurries containing powders, wastewater for water treatment, etc. The collected matter is preferably a powder or a slurry.

[0041] The pressure of the fluid is preferably 0.1 to 2.0 MPa, more preferably 0.3 to 1.0 MPa, and even more preferably 0.5 to 1.0 MPa. Here, the pressure is the pressure (gauge pressure) immediately before connecting to the fluid injection nozzle, and is the pressure measured when the fluid injection nozzle is closed. From the viewpoint of easily obtaining the effect of the speed change of the fluid injection nozzle due to the degree of blowing off the collected matter described above, in blowing off the collected matter, it is preferable that the pressure is substantially constant. For example, it is preferable not to change the pressure setting.

[0042] The casing for housing the filter is not particularly limited as long as it has an internal shape that matches the filter. For example, the internal shape may be substantially cylindrical. The size of the collection device is also not particularly limited as long as it is a size that matches the purpose of the collection device.

[0043] One aspect of the present disclosure relates to a method for operating the collection device, the method for operating the collection device comprising the steps of: causing a fluid ejected from a fluid ejection port to knock off collected matters adhering to a filter; As described above, the adhesion state of the collected matter on the filter differs immediately after the start of the brush-off and when the brush-off has progressed to a certain extent, and the rotation speed of the fluid spray nozzle slows down. Therefore, in the method of operating the collection device, it is preferable to keep the spray pressure of the fluid at a substantially constant level. For example, it is preferable not to change the pressure setting. EXAMPLES

[0044] The present disclosure will be described in further detail below with reference to specific production methods, examples, and comparative examples, but these are not intended to limit the present disclosure in any way.

[0045] Example 1 A powder collector shown in the elevation and plan views of Figures 1 and 2 was fabricated as a powder collector. The height Amm and casing diameter Bmm of the inside of the casing 5 in Figure 1 were fabricated as shown in Table 1. The filter 4 was a modified version of an Amano PiE·PiE-SDN·Mi antistatic filter. The filter inner radius Hmm and filter outer radius Imm shown in Figure 11 are shown in Table 1. The fluid to be sprayed from the fluid spray nozzle was compressed air at 0.7 MPa (the pressure here is the pressure (gauge pressure) just before the fluid spray nozzle is connected, and is the pressure measured when the fluid spray nozzle is closed). The above modification was performed so that the filter inner radius and filter outer radius were as shown in Table 1. The filter height was modified to 450 mm so that it would fit inside the casing.

[0046] Details of the fluid injection nozzle are shown in Fig. 9 and Fig. 10. Fig. 9 is a diagram mainly explaining the second shaft portion 3. The distance C between the injection ports 9 shown in Fig. 9, the length D of the second shaft portion 3, the rotation radius E of the injection nozzle, and the number G of the fluid injection ports were each produced as shown in Table 1. In addition, a fluid injection nozzle was produced so that the angle F shown in Fig. 10 was an angle as shown in Table 1. Note that the angle F at which the nozzle strikes the filter in the vertical direction is set to 0°.

[0047] In addition, the cross-sectional area of ​​the second shaft part J (mm 2 ), the total area of ​​the fluid injection nozzle outlet K( mm 2 ), the total area of ​​the fluid injection port between the midpoint of the second shaft and the joint L (mm 2 ), the sum of the areas of the fluid injection ports between the midpoint of the second shaft portion and the end of the second shaft portion opposite the joint, M (mm 2 ) are listed in Table 2.

[0048] (Dry durability test) An air intake blower piping was installed in the space on the fluid injection nozzle side in Figure 1. The collection device for collected material in Figure 1 was also installed in a sealed powder storage hopper, and 1 kg of Nisshin Flour Milling Co., Ltd.'s weak wheat flour was added to the powder storage hopper, which has a capacity of 300 L. A compressed air blowing piping was installed in the powder storage hopper to lift up the wheat flour. Then, the intake blower and the compressed air blowing for winding up the flour were operated for 30 seconds. As a result, flour was taken into the space between the casing 5 and the filter 4. After that, the intake blower and the compressed air blowing for winding up the flour were stopped for 30 seconds, and compressed air of 0.7 MPa was blown into the fluid injection nozzle to knock off the flour collected on the filter. In the embodiment of Fig. 1, the fluid is injected from the inside of the filter by the fluid injection nozzle to knock off the flour adhering to the outside of the filter. The above series of operations was counted as one set, and the flour was refreshed after every 100 sets. A total of 2,000 sets of durability tests were conducted.

[0049] <Evaluation of brush-off ability> The suction pressure was adjusted by the suction blower that was installed before the dry durability test so that the blower side pressure immediately adjacent to the filter was -10 kPa. The hopper side pressure immediately adjacent to the filter before the dry durability test was -6 kPa. After the dry durability test, the hopper side pressure immediately adjacent to the filter was measured. The brush-off ability was evaluated according to the following criteria. The evaluation results are shown in Table 3. In this example, ratings A to D are acceptable levels. After the dry durability test, the pressure on the hopper side closest to the filter was A: -6.0kPa or less B: Over -6.0kPa, -4.0kPa or less C: Over -4.0kPa, -2.0kPa or less D: Over -2.0kPa, -1.0kPa or less E: Exceeds -1.0kPa

[0050] <Evaluation of filter damage> After the above dry durability test was conducted, a new filter was installed on the secondary side of the intake blower so that it could capture the flour that passed through the openings caused by the filter damage. The series of operations in the dry durability test was conducted on 100 additional sets, and the flour captured in the filter was visually observed. The filter installed on the secondary side of the intake blower was colored black so that it could be distinguished from the flour. Filter damage was evaluated according to the following criteria. The evaluation results are shown in Table 3. In this example, ratings A to C are acceptable levels. A: Almost no powder is visible on the filter. B: A thin layer of powder is observed on the filter. C: Powder is clearly observed on the filter. D: Powder is observed all over the filter.

[0051] <Evaluation of filter brushing efficiency> Before carrying out the above-mentioned dry durability test, 500g of wheat flour was put into the powder storage hopper using the dry durability test device, and the intake blower and the compressed air for lifting up the wheat flour were operated to make the entire amount of wheat flour adhere to the filter. After that, the intake blower and the compressed air for lifting up the wheat flour were stopped, and 0.7MPa compressed air was blown into the fluid injection nozzle for 5 seconds. After that, the mass of wheat flour that had been brushed off from the filter was confirmed. The filter brushing efficiency was evaluated according to the following criteria. The evaluation results are shown in Table 3. In this example, ratings A to D are acceptable levels. A: The mass of the collected flour is between 400g and 500g B: The mass of the collected flour is between 350g and 400g C: The mass of the collected flour is 300g or more but less than 350g D: The mass of the collected flour is 250g or more but less than 300g E: The mass of the collected flour is less than 250g

[0052] <Examples 2 to 17 and 19> A powder collector was produced in the same manner as in Example 1, except that the configuration was changed as shown in Tables 1 and 2, and the above-mentioned evaluation was carried out. The evaluation results are shown in Table 3.

[0053] <Example 18> A powder collector was produced in the same manner as in Example 1, except that the configuration was changed as shown in Tables 1 and 2. In addition, a dry durability test was performed in the same manner as in Example 1, except that the compressed air pressure of the fluid injection nozzle was changed to 0.6 MPa. The evaluation results are shown in Table 3.

[0054] <Example 20> A powder collector was fabricated and evaluated in the same manner as in Example 1, except that the powder collector had the shape shown in the elevation and plan views of Figures 3 and 4 and the configuration was changed as shown in Tables 1 and 2. The evaluation results are shown in Table 3.

[0055] <Example 21> The powder collector was shaped as shown in the elevation and plan views of Fig. 5 and Fig. 6, and the bend angle of the fluid injection nozzle was inclined by 10° with respect to a plane substantially parallel to the first shaft portion. In other words, the angle θA between the line passing through the axis of the second shaft portion and the generatrix of the filter was set to 10°. A powder collector was produced and evaluated in the same manner as in Example 1, except for the changes shown in Tables 1 and 2. The evaluation results are shown in Table 3.

[0056] <Example 22> A slurry collector was fabricated as shown in Tables 1 and 2, with the shape shown in the elevation and plan views of Figures 7 and 8 as the collected material. The casing height A and casing inner diameter B in Figure 7 were fabricated as shown in Table 1. A modified TR 9A made by Nakao Filter Co., Ltd. was used as the filter. The filter inner radius I mm is shown in Table 1. The fluid to be sprayed from the fluid spray nozzle was pure water with the pressure adjusted to 0.7 MPa. The distance C between the spray nozzles, the length D of the second shaft, and the rotation radius E of the spray nozzle shown in Fig. 9 were created as shown in Table 1. A fluid spray nozzle was also created so that the angle F shown in Fig. 10 was set to the angle shown in Table 1. Note that the angle F at which the nozzle strikes the filter in the vertical direction was set to 0°.

[0057] <Wet durability test> 100L of slurry was prepared by dispersing 100g of water in 5g of wheat flour. The slurry was fed into the above-mentioned slurry collector at a rate of 10L / min and operated continuously for 10min. After that, the water in the slurry collector was drained and pure water was sprayed from the spray nozzle onto the filter for 1min. The above series of operations was repeated 100 times.

[0058] <Evaluation of wet filter brushing ability> After the wet durability test, pure water was passed through the filter continuously at a rate of 50 L / min. The pressure before and after the filter was measured, and the difference between the two pressures was measured using a micro-differential pressure gauge. A commercially available micro-differential pressure gauge can be used, for example, the DMD331 manufactured by BD. The wet filter brushing ability was evaluated according to the following criteria. The evaluation results are shown in Table 3. In this example, an A or B rating is an acceptable level. A: Differential pressure is 0 kPa or more and less than 5 kPa B: Differential pressure is 5kPa or more and less than 10kPa C: Differential pressure is 10kPa or more

[0059] <Comparative Examples 1 and 2> A powder collector having the shape shown in the elevation and plan views of Figs. 1 and 2 was prepared in the same manner as in Example 1, except that the configuration was changed as shown in Tables 1 and 2. A dry durability test was then performed. The results of the evaluation are shown in Table 3.

[0060] <Comparative Example 3> In Example 1, the powder collector had the shape shown in the elevation and plan views of Figures 12 and 13. A commercially available rotary nozzle (Misumi Corporation, model: SPNZD) was attached to the tip of the fluid injection nozzle shaft 16. The filter inner radius Hmm and filter outer radius Imm are shown in Table 1. The fluid injected from the fluid injection nozzle was compressed air at 0.7 MPa. Using the above powder collector, a dry durability test was carried out and then an evaluation was carried out. The evaluation results are shown in Table 3.

[0061] <Comparative Example 4> The powder collector has the shape shown in the elevation and plan views of Figures 14 and 15, and the fluid injection nozzle is designed not to rotate. The fluid injection nozzle nozzle nozzle outlet is designed to go straight in the vertical direction toward the filter. In addition, a filter rotation support 17 is used, and the filter is modified to be rotatable. The distance between the fluid injection outlets, the cross-sectional area of ​​the fluid injection nozzle, and the total area of ​​the fluid injection outlet are shown in Tables 1 and 2, respectively. Using the prepared powder collector, a dry durability test was carried out in the same manner as in Example 1, except that the filter modified to be rotatable simultaneously with the inflow of compressed air into the fluid injection nozzle was rotated at a speed of 30 rpm for 30 seconds in the dry durability test, and then evaluation was carried out. The evaluation results are shown in Table 3.

[0062] <Comparative Example 5> The powder collector has a shape in which the fluid injection nozzle protrudes from the rotation shaft as shown in the elevation and plan views of Figures 16 and 17. The fluid injection nozzle is fabricated to move straight in the vertical direction toward the filter, and a separate motor 18 is added to enable rotation of the fluid injection nozzle shaft 16. The distance between the fluid injection nozzles, the cross-sectional area of ​​the fluid injection nozzle, and the total area of ​​the fluid injection nozzle are shown in Tables 1 and 2, respectively. The fluid injected from the fluid injection nozzle was compressed air at 0.7 MPa. Using the prepared powder collector, the dry durability test was carried out in the same manner as in Example 1, except that when blowing compressed air of 0.7 MPa into the fluid injection nozzle, the fluid injection nozzle was rotated at 60 rpm by a separately attached motor, and then evaluation was carried out. The evaluation results are shown in Table 3.

[0063] <Comparative Example 6> A slurry collector was fabricated with the shape shown in the elevation and plan views of Figures 18 and 19, as shown in Table 1. A roller ball GRB-1AP manufactured by Ikeuchi was attached as a shower nozzle to the tip of the fluid injection nozzle. The casing height A and casing inner diameter B in Figure 18 were fabricated as shown in Table 1. A modified TR 9A manufactured by Nakao Filter was used as the filter. The outer radius I mm of the filter is shown in Table 1. The fluid sprayed from the fluid injection nozzle was pure water with the pressure adjusted to 0.7 MPa. After the above-mentioned wet durability test, the wet filter brushing ability was evaluated. The evaluation results are shown in Table 3.

[0064] In Examples 1 to 22, the fluid ejection nozzle was configured to rotate around its rotation axis by the action of the fluid ejected from the fluid ejection port, whereas in Comparative Examples 1 to 6, the fluid ejection nozzle could not be rotated satisfactorily by the action of the fluid alone.

[0065] [Table 1] The presence or absence of elastic deformation of the filter is recorded as "yes" if the filter is elastically deformed when fluid is sprayed from the fluid spray nozzle at a pressure of 0.7 MPa onto the filter.

[0066] [Table 2]

[0067] [Table 3]

[0068] The present disclosure relates to the following configurations and methods. (Configuration 1) A collection device having a filter for capturing collected matter, a casing for housing the filter, and a fluid injection nozzle, The collection device is configured to brush off the collected matter captured on the filter by a fluid jetted from the fluid jet nozzle, The filter is generally cylindrical; The fluid ejection nozzle is rotatably supported; When the collection device is seen from the axial direction of the rotation shaft of the fluid injection nozzle, the rotation shaft of the fluid injection nozzle is located in the space inside the filter, a direction of a generatrix of the filter and a rotation axis of the fluid ejection nozzle are substantially parallel to each other; The fluid ejection nozzle has a first shaft portion and a second shaft portion, the first shaft portion and the second shaft portion are connected via a connecting portion, The first shaft portion is disposed at a position overlapping with the rotation axis, the second shaft portion is disposed at a position not overlapping with the rotation axis of the fluid ejection nozzle, the first shaft portion, the second shaft portion and their connecting portion are hollow so that the fluid can pass therethrough; the second shaft portion has a fluid ejection port for ejecting the fluid toward the filter; a collection device, characterized in that the fluid ejection nozzle is provided so that the fluid ejection nozzle rotates about the rotation axis of the fluid ejection nozzle by the action of the fluid ejected from the fluid ejection nozzle. (Configuration 2) A collection device having a filter for capturing collected matter, a casing for housing the filter, and a fluid injection nozzle, The collection device is configured to brush off the collected matter captured on the filter by a fluid jetted from the fluid jet nozzle, The filter is generally cylindrical; The fluid ejection nozzle is rotatably supported; When the collection device is seen from the axial direction of the rotation shaft of the fluid injection nozzle, the rotation shaft of the fluid injection nozzle is located in the space inside the filter, a direction of a generatrix of the filter and a rotation axis of the fluid ejection nozzle are substantially parallel to each other; The fluid ejection nozzle has a first shaft portion and a second shaft portion, the first shaft portion and the second shaft portion are connected via a connecting portion, The first shaft portion is disposed at a position overlapping with the rotation axis, the second shaft portion is disposed at a position not overlapping with the rotation axis of the fluid ejection nozzle, the first shaft portion, the second shaft portion and their connecting portion are hollow so that the fluid can pass therethrough; the second shaft portion has a fluid ejection port for ejecting the fluid toward the filter; In a cross section perpendicular to a line passing through the axis of the first shaft portion and passing through the center of the fluid ejection port, An intersection point where the cross section intersects with a straight line passing through the axis of the first shaft portion is defined as an intersection point A, and an intersection point where the cross section intersects with the axis of the second shaft portion is defined as an intersection point B, When the angle between the line connecting the intersection point A and the intersection point B and the line connecting the center of the fluid ejection port and the intersection point B is defined as an angle F, The collection device is characterized in that the fluid ejection port is located within the angle F range of 5 to 175°. (Configuration 3) 3. The collection device according to claim 2, wherein the angle F is 10 to 60°. (Configuration 4) 4. The collection device according to any one of configurations 1 to 3, wherein the filter is elastically deformed when the fluid is injected from the fluid injection nozzle to the filter at a pressure of 0.7 MPa. (Configuration 5) the fluid ejection nozzle has a plurality of the fluid ejection ports spaced apart from one another; 5. The collection device according to any one of configurations 1 to 4, wherein an arithmetic mean value C of the distance between the centers of the fluid ejection ports is 50 mm or less. (Configuration 6) In the fluid injection nozzle, the total area of ​​the fluid injection ports K (mm 2 ) is the shaft cross-sectional area J (mm 2 6. The collection device according to any one of configurations 1 to 5, wherein the collection device is smaller than the above. (Configuration 7) The total area of ​​the fluid ejection ports existing between the longitudinal midpoint of the second shaft portion and the joint portion is defined as L (mm 2 )year, The sum of the areas of the fluid ejection ports existing between the midpoint of the second shaft portion in the longitudinal direction and the end portion of the second shaft portion located in the opposite direction to the joint portion is defined as M (mm 2 ), L (mm 2 ) is the M (mm 2 7. The collection device according to any one of configurations 1 to 6, wherein the collection device is smaller than the above. (Configuration 8) 8. The collection device according to any one of configurations 1 to 7, wherein the collected matter is a powder or a slurry. (Configuration 9) The collection device according to any one of configurations 1 to 8, wherein a line passing through an axis of the second shaft portion and the generatrix of the filter are parallel to each other, or an angle θA between the line passing through the axis of the second shaft portion and the generatrix of the filter is 15° or less. (Method 10) A method for operating the collection device according to any one of configurations 1 to 9, comprising the steps of: A method for operating a collection device, comprising the steps of: the fluid ejected from the fluid ejection port knocking off the collected matter adhering to the filter; and changing a rotational speed of the fluid ejection nozzle in association with the knocking off. [Explanation of symbols]

[0069] 1: first shaft portion, 2: coupling portion, 3: second shaft portion, 4: filter, 5: casing, 6: rotation support part, 7: axis of first shaft portion, 8: axis of second shaft portion, 9: fluid injection port, 10: cross section passing through the fluid ejection port, 11: midpoint in the longitudinal direction of the second shaft portion, 12: intersection point between the cross section passing through the fluid ejection port and a line passing through the axis of the first shaft portion, 13: intersection point between the cross section passing through the fluid ejection port and a line passing through the axis of the second shaft portion, 14: line connecting the center of the fluid ejection port 9 and intersection point B, 15: line connecting intersection point A and intersection point B, 16: nozzle shaft for injecting fluid, 17: filter rotation support, 18: motor, A: casing internal height, B: casing internal diameter, C: average value of distance between centers of fluid injection ports, D: second shaft length, E: injection nozzle rotation radius, F: angle between line 15 and line 14, G: number of fluid injection ports, H: filter internal radius, I: filter external radius

Claims

1. A collection device having a filter for capturing collected matter, a casing for housing the filter, and a fluid injection nozzle, The collection device is configured to brush off the collected matter captured on the filter by a fluid jetted from the fluid jet nozzle, The filter is generally cylindrical; The fluid ejection nozzle is rotatably supported; When the collection device is seen from the axial direction of the rotation shaft of the fluid injection nozzle, the rotation shaft of the fluid injection nozzle is located in the space inside the filter, a direction of a generatrix of the filter and a rotation axis of the fluid ejection nozzle are substantially parallel to each other; The fluid ejection nozzle has a first shaft portion and a second shaft portion, the first shaft portion and the second shaft portion are connected via a connecting portion, The first shaft portion is disposed at a position overlapping with the rotation axis, the second shaft portion is disposed at a position not overlapping with the rotation axis of the fluid ejection nozzle, the first shaft portion, the second shaft portion and their connecting portion are hollow so that the fluid can pass therethrough; the second shaft portion has a fluid ejection port for ejecting the fluid toward the filter; a collection device, characterized in that the fluid ejection nozzle is provided so that the fluid ejection nozzle rotates about the rotation axis of the fluid ejection nozzle by the action of the fluid ejected from the fluid ejection nozzle.

2. A collection device having a filter for capturing collected matter, a casing for housing the filter, and a fluid injection nozzle, The collection device is configured to brush off the collected matter captured on the filter by a fluid jetted from the fluid jet nozzle, The filter is generally cylindrical; The fluid ejection nozzle is rotatably supported; When the collection device is seen from the axial direction of the rotation shaft of the fluid injection nozzle, the rotation shaft of the fluid injection nozzle is located in the space inside the filter, a direction of a generatrix of the filter and a rotation axis of the fluid ejection nozzle are substantially parallel to each other; The fluid ejection nozzle has a first shaft portion and a second shaft portion, the first shaft portion and the second shaft portion are connected via a connecting portion, The first shaft portion is disposed at a position overlapping with the rotation axis, the second shaft portion is disposed at a position not overlapping with the rotation axis of the fluid ejection nozzle, the first shaft portion, the second shaft portion and their connecting portion are hollow so that the fluid can pass therethrough; the second shaft portion has a fluid ejection port for ejecting the fluid toward the filter; In a cross section perpendicular to a line passing through the axis of the first shaft portion and passing through the center of the fluid ejection port, An intersection point where the cross section intersects with a straight line passing through the axis of the first shaft portion is defined as an intersection point A, and an intersection point where the cross section intersects with the axis of the second shaft portion is defined as an intersection point B, When the angle between the line connecting the intersection point A and the intersection point B and the line connecting the center of the fluid ejection port and the intersection point B is defined as an angle F, The collection device is characterized in that the fluid injection port is present within the angle F range of 5 to 175 degrees.

3. 3. The collection device of claim 2, wherein the angle F is between 10 and 60 degrees.

4. 3. The collection device according to claim 1, wherein the filter is elastically deformed when the fluid is injected from the fluid injection nozzle at a pressure of 0.7 MPa toward the filter.

5. the fluid ejection nozzle has a plurality of the fluid ejection ports spaced apart from one another; 3. The collection device according to claim 1, wherein an arithmetic mean value C of the distance between the centers of the fluid injection ports is 50 mm or less.

6. In the fluid injection nozzle, the total area of ​​the fluid injection port K (mm ２ ) is the shaft cross-sectional area J (mm ２ 3. The collection device of claim 1 or 2, wherein the diameter of the trap is smaller than 1 mm.

7. The sum of the areas of the fluid ejection ports existing between the longitudinal midpoint of the second shaft portion and the joint portion is defined as L (mm ２ )year, The sum of the areas of the fluid ejection ports existing between the midpoint of the second shaft portion in the longitudinal direction and the end portion of the second shaft portion located in the opposite direction to the joint portion is defined as M (mm ２ ) and The L (mm ２ ) is the M (mm ２ 3. The collection device of claim 1 or 2, wherein the diameter of the trap is smaller than 1 mm.

8. The collection device according to claim 1 or 2, wherein the collected material is a powder or a slurry.

9. 3. The collection device according to claim 1 or 2, characterized in that a straight line passing through the axis of the second shaft portion and the generatrix of the filter are parallel to each other, or an angle θA between a straight line passing through the axis of the second shaft portion and the generatrix of the filter is 15° or less.

10. A method for operating the collection device according to claim 1 or 2, comprising the steps of: A method for operating a collection device, comprising the steps of: the fluid ejected from the fluid ejection port knocking off the collected matter adhering to the filter; and changing a rotational speed of the fluid ejection nozzle in association with the knocking off.

Images