JP6895986B2 - Wet dust collector - Google Patents

Description

The present invention relates to a wet dust collector that collects dust in a gas by contacting it with a liquid, and more particularly to a wet dust collector suitable for use in a food factory.

In a food factory, if raw material powder such as wheat flour put into a tank is generated and the dust is accumulated on the beam of the factory, there is a risk of microbial contamination by mold and bacteria. In addition, when dust is mixed into the tanks and production lines of other products, it causes food allergies and has the result of threatening food safety. For this reason, in recent years, dust collectors have come to be used in the food industry as well.

As the dust collector, a filtration type dust collector that collects dust using a filter and a wet dust collector that collects dust in the liquid by contacting the dust with the liquid are well known. The filter type dust collector causes the filter to be clogged by humidity, so that there is no problem in a food factory with low humidity, but it is not suitable for use in a food factory with high humidity. On the other hand, the wet dust collector is suitable for use in a humid food factory because the filter is not clogged by moisture.

Patent Document 1 shows an example of a wet dust collector. In this wet dust collector, a liquid bathtub for storing liquid is provided in the lower part, and an air chamber on the primary side and an air chamber on the secondary side are provided in the upper part separated by a liquid level and a wall. During operation, the dust-containing airflow that has flowed into the air chamber on the primary side is guided to the air chamber on the secondary side via a flow path composed of an S-shaped impeller. At this time, due to the pressure loss in the flow passage, the air pressure in the air chamber on the secondary side becomes lower than the air pressure in the air chamber on the primary side, so that the liquid level on the primary side falls and the liquid level on the secondary side rises. Then, when the dust-containing airflow passes through the flow passage, the liquid is wound up, and the wound liquid and the dust in the airflow come into contact with each other, and the dust is collected in the liquid.

In such an S-shaped impeller type wet dust collector, the liquid level control during operation is an important factor that affects the collection performance. If the liquid level is lower than the predetermined water level, the liquid is not sufficiently wound up at the S-shaped impeller portion, and the collection efficiency is lowered. On the contrary, when the liquid level is higher than the predetermined water level, the gas passage of the S-shaped impeller portion becomes narrow and the predetermined air volume cannot be secured. Therefore, in Patent Document 1, first and second liquid level adjusting boxes for controlling the liquid levels of the air chambers on the primary side and the secondary side are provided, and the upper end position of the overflow pipe provided in each liquid level adjusting box is used. The liquid levels on the primary and secondary sides are controlled. The liquid level in each liquid level adjustment box is separated from the liquid level in each air chamber, and is controlled only by the differential pressure of the air pressure in each air chamber. Therefore, even if the liquid level in each air chamber is rippling, the liquid level in each adjustment box is not affected and a stable liquid level is maintained.

Japanese Patent No. 4799400

In the wet dust collector of Patent Document 1, the dust-containing airflow winds up the liquid on the primary side when passing through the S-shaped impeller and comes into contact with the liquid. That is, gas-liquid contact is performed while winding up the liquid on the primary side. Therefore, it is necessary to strictly control the liquid level on the primary side. In addition, since a liquid heavier than air must be wound up, the pressure loss in the S-shaped impeller increases, and a large amount of energy (power) is required.

In view of the above points, it is an object of the present invention to provide a wet dust collector that does not require strict control of the liquid level and can obtain high collection efficiency with a small pressure loss.

The wet dust collector according to the present invention has a storage unit for storing liquid, a first air chamber on the primary side into which a dust-containing air flow is introduced, and a second air chamber on the secondary side for discharging the air flow after dust collection. A first partition partition that separates the first air chamber and the second air chamber is provided, and the dust-containing airflow flowing from the first air chamber to the second air chamber is brought into contact with the liquid in the storage portion to be brought into contact with the liquid in the storage portion. A wet dust collector that collects dust in a liquid, and has a second partition wall that divides a storage unit into a first storage unit that communicates with a first air chamber and a second storage unit that communicates with a second air chamber. It further includes a first constriction portion formed between the first partition wall and the second partition wall. When the dust-containing airflow flows from the first air chamber to the second air chamber through the first constriction portion, the liquid overflowing from the second storage portion due to the pressure difference between the first air chamber and the second air chamber, and the first The dust in the dust-containing airflow comes into contact with the dust-containing airflow that has passed through the constricted portion, and the dust in the dust-containing airflow is collected in the liquid.

According to such a configuration, gas-liquid contact is performed on the secondary side while the dust-containing airflow passing through the first constriction blows up the overflowing liquid, so that it is necessary to strictly control the liquid level on the primary side. Absent. Further, also on the secondary side, the required amount of overflowing liquid can be secured by appropriately setting the vertical position of the second storage portion, so that it is not necessary to strictly control the liquid level on the secondary side. Further, since it is not necessary to wind up the liquid at the time of gas-liquid contact and the liquid overflows due to the pressure difference (static pressure) between the primary side and the secondary side, high collection efficiency can be obtained with a small pressure loss.

According to a preferred embodiment of the present invention, the upper end of the second partition wall is set at a position lower than the liquid level when the liquid in the second reservoir is lifted by the pressure difference, and the upper end of the second partition wall is set. A constant amount of liquid always overflows from the second storage portion according to the difference in height between the liquid surface and the liquid level.

In the present invention, the first partition wall and the second partition wall are made of, for example, a hollow tubular body, the outside of the first partition wall is the first air chamber, the inside is the second air chamber, and the outside of the second partition wall is the first. One storage section may be used, and the inside may be a second storage section. In this case, the airflow flows from the outside to the inside. Alternatively, conversely, the inside of the first partition wall is the first air chamber, the outside is the second air chamber, the inside of the second partition wall is the first storage part, and the outside is the second storage part. May be good. In this case, the airflow flows from the inside to the outside.

In the present invention, the first partition wall and the second partition wall may be plate bodies, respectively. In this case, one side is the first air chamber and the other side is the second air chamber across the first partition wall. Further, the first air chamber side is the first storage portion and the second air chamber side is the second storage portion across the second partition wall.

In the present invention, the first partition wall and the second partition wall may have folds at portions facing each other with the first constriction portion interposed therebetween.

In the present invention, a return pipe may be provided to return the liquid scattered in contact with the dust-containing airflow to the first storage unit.

According to a preferred embodiment of the present invention, a baffle is provided above the second storage portion to receive the liquid scattered in contact with the dust-containing airflow. In addition, a demister that receives liquid droplets is provided above the baffle.

In the present invention, an opening plate having an opening at a position facing the baffle may be provided below the baffle, and a second constriction may be formed between the peripheral edge of the opening of the opening plate and the baffle. ..

In the present invention, the second partition wall is composed of an upper second partition wall and a lower second partition wall arranged so as to be displaced in the vertical direction, and the first constriction portion is formed between the first partition wall and the upper second partition wall. It may be composed of an upper first constriction portion and a lower first constriction portion formed between the first partition wall and the lower second partition wall. Further, the second storage portion may be composed of an upper second storage portion formed by the upper second partition wall and a lower second storage portion formed by the lower second partition wall. In this case, the dust-containing airflow passes through the lower first constriction portion, then comes into contact with the liquid overflowing from the lower second reservoir portion, and then passes through the upper first constriction portion, and then from the upper second reservoir portion. Contact with overflowed liquid.

In the present invention, the dust-containing airflow may be brought into contact with the liquid in the first storage portion before the dust-containing airflow flows from the first air chamber into the first constricted portion.

In the present invention, a plurality of pairs of the first partition wall and the second partition wall may be provided.

As another embodiment of the present invention, the liquid in the storage unit may be overflowed by supplying the liquid from the outside to the storage unit. In this case, the storage portion is formed inside a container into which the liquid can be injected, and is provided so as to communicate with the second air chamber. In addition, a supply path for supplying the liquid to this storage portion is provided. A narrowed portion is formed between the first partition wall and the container.

The liquid may be directly supplied from the supply path to the storage section, or a first supply path and a second supply path are provided, and the liquid supplied from the first supply path into the dust collector is secondly supplied by a power source. It may be supplied from the road to the reservoir. In this case, the liquid supplied from the supply channel to the storage section is preferably clean water.

According to the present invention, it is possible to provide a wet dust collector that does not require strict control of the liquid level and can obtain high collection efficiency with a small pressure loss.

It is a partial cross-sectional side view of the wet dust collector which concerns on 1st Embodiment of this invention. It is an external view of an outer cylinder and an inner cylinder. It is a figure which showed the flow of the air flow in a dust collector. It is an enlarged view of the part A of FIG. It is a figure which showed the state that the liquid level overflows. It is a figure which showed how the overflowed water begins to be agitated by the air flow which passed through a constriction part. It is the figure which showed the state that the overflowed water was further agitated and spouted up. It is a figure which showed the 2nd Embodiment of this invention. It is a figure which showed the 3rd Embodiment of this invention. It is a figure which showed the 4th Embodiment of this invention. It is a figure which showed the 5th Embodiment of this invention. It is a figure which showed the 6th Embodiment of this invention. It is a figure which showed the 7th Embodiment of this invention. It is a figure which showed the 8th Embodiment of this invention. It is a figure which showed the 9th Embodiment of this invention. It is a figure which showed the tenth embodiment of this invention. It is a figure which showed other example of the 1st bulkhead and the 2nd bulkhead. It is a figure which showed other example of the 1st bulkhead and the 2nd bulkhead. It is a figure which showed the eleventh embodiment of this invention. It is a figure which showed the main part of the eleventh embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the same parts or corresponding parts are designated by the same reference numerals.

FIG. 1 shows a first embodiment of a wet dust collector according to the present invention. The wet dust collector 100 is used for collecting dust such as wheat flour in, for example, a food factory. The wet dust collector 100 includes a pedestal 1, a tank 3 installed on the pedestal 1, an airflow introduction pipe 9 and a liquid introduction pipe 10 communicating with the inside of the tank 3, and a cylindrical cylinder provided above the tank 3. 4, a demister 5 provided above the cylindrical cylinder 4, a filter 6 provided above the demister 5, and a blower unit 7 provided above the filter 6. A frame 2 is erected on the upper surface of the pedestal 1, and casters 8 for movement are provided on the lower surface.

The tank 3 is composed of a cylindrical container whose upper surface is open, and the upper portion constitutes a dust collecting portion 31 and the lower portion constitutes a storage portion 32. The dust collecting portion 31 includes an outer cylinder 33 (first partition wall) made of a hollow tubular body, an inner cylinder 34 (second partition wall) also made of a hollow tubular body, and a horizontal plate formed in a disk shape. 35 is provided. As shown in FIG. 2A, the outer cylinder 33 is composed of a hollow cylinder. As shown in FIG. 2B, the inner cylinder 34 is composed of a two-stage cylinder having a large diameter portion 34a at the upper portion and a small diameter portion 34b at the lower portion. The outer diameter dimension D2 of the large diameter portion 34a is slightly smaller than the inner diameter dimension D1 of the outer cylinder 33. Therefore, as shown in FIG. 1, a narrowed portion G (first narrowed portion) formed of a gap is formed between the inner peripheral surface of the outer cylinder 33 and the outer peripheral surface of the large diameter portion 34a of the inner cylinder 34. It is formed. The outer cylinder 33 and the inner cylinder 34 are not limited to cylinders, and may be, for example, polygonal cylinders having a horizontal cross section such as a quadrangle or a hexagon.

A first air chamber S1 and a second air chamber S2 partitioned by an outer cylinder 33 are provided in the dust collecting unit 31. The outside of the outer cylinder 33 is the first air chamber S1, and the inside of the outer cylinder 33 is the second air chamber S2. The airflow introduction pipe 9 is provided so as to communicate with the first air chamber S1 so that its horizontal central axis intersects the vertical central axis of the tank 3. The liquid W supplied from the liquid introduction pipe 10 is stored in the storage unit 32. The liquid W is water here, but may be a disinfectant (for example, hypochlorite water), a solvent, or the like in addition to water. The lower part of the inner cylinder 34 is immersed in the liquid W, and the storage portion 32 is divided into a first storage portion P1 and a second storage portion P2 by the inner cylinder 34. The first storage unit P1 is outside the inner cylinder 34 and communicates with the first air chamber S1, and the second storage unit P2 is inside the inner cylinder 34 and communicates with the second air chamber S2. doing. When the wet dust collector 100 is not in operation, the liquid level heights of the first storage unit P1 and the second storage unit P2 are the same.

A cylindrical cylinder 4 is arranged on the upper part of the tank 3 via a disk-shaped opening plate 42. The opening plate 42 has a cylindrical large-diameter pipe 36 and an opening (not shown) that communicates with the pipe 36. The pipe 36 faces the second air chamber S2 and guides the air flow in the second air chamber S2 to the internal space of the cylindrical cylinder 4. A plurality of return pipes 11, which will be described later, are provided on the peripheral edge of the opening plate 42. The upper and lower ends of the return pipe 11 are open, the upper end faces the internal space of the cylindrical cylinder 4, and the lower end is immersed in the liquid W.

The internal space of the cylindrical cylinder 4 is provided with a baffle 41 that receives the liquid scattered from the second air chamber S2 during the operation of the wet dust collector 100. In the present embodiment, the baffle 41 is made of a bottomed cylinder, and is attached to the disk-shaped support plate 44 by the support member 43 so that the opening side is on the bottom. An opening (not shown) through which airflow can pass is formed in the central portion of the support plate 44.

A demister 5 is arranged above the cylindrical cylinder 4, and a filter 6 is arranged above the demister 5. The demista 5 is composed of, for example, a stack of vinyl meshes, and when an air flow passes through the mesh, it receives liquid droplets and aggregates them into large droplets. The agglomerated droplets fall downward and are separated from the airflow. The filter 6 is a filter for almost completely removing fine particles in the air flow, and is similar to a general dust collecting filter, a HEPA filter (High Efficiency Particulate Air Filter), and a ULPA filter (Ultra Low Penetration Air Filter). High-performance filter can also be used.

The blower unit 7 is installed above the frame 2. Inside the blower unit 7, a blower 70 including a fan 71 and a motor 72 for rotating the fan 71 is housed. Further, the blower unit 7 is provided with a discharge hole 73 for discharging the clean airflow sent from the blower 70.

FIG. 3 is a diagram showing the flow of the air flow in the wet dust collector 100 described above. As shown by the arrow, the dust-containing airflow containing dust passes through the narrowed portion G between the outer cylinder 33 and the inner cylinder 34 after being introduced from the airflow introduction pipe 9 into the first air chamber S1. It flows into the second air chamber S2. At this time, due to the pressure difference between the first air chamber S1 and the second air chamber S2, the liquid W in the second storage portion overflows from the upper part of the inner cylinder 34 and comes into contact with the dust-containing airflow (gas-liquid contact). Dust is collected in the liquid, which will be described in detail later.

The airflow in which the dust is collected flows into the internal space of the cylindrical cylinder 4 through the pipe 36, and goes to the demister 5 and the filter 6 through the opening of the support plate 44. At this time, the liquid scattered into the cylindrical cylinder 4 due to the gas-liquid contact in the second air chamber S2 collides with the baffle 41, is received, is reflected by the baffle 41, and falls downward. Then, a part of the dropped liquid returns to the first storage unit P1 through the return pipe 11 (FIG. 1). The return pipe 11 plays a role of preventing the liquid from becoming polluted by circulating the liquid.

The airflow from the internal space of the cylindrical cylinder 4 first passes through the demister 5. At this time, the droplets of the liquid mixed in the air flow without being received by the baffle 41 are received and removed by the demister 5. The airflow that has passed through the demista 5 then passes through the filter 6. At this time, the fine particles of dust remaining in the air flow are almost completely removed by the filter 6. The airflow that has passed through the filter 6 becomes a clean airflow, flows into the blower unit 7, and is discharged from the discharge hole 73 by the rotation of the fan 71.

Next, the gas-liquid contact in the part A of FIG. 1 will be described in detail. FIG. 4 is an enlarged view of part A. As described above, a narrowed portion G is provided between the outer cylinder 33 and the inner cylinder 34 (large diameter portion 34a). Further, an inlet 37 for dust-containing airflow is provided between the lower end of the outer cylinder 33 and the horizontal plate 35. FIG. 4 shows a state in which the wet dust collector 100 is not operated. In this state, there is no pressure difference between the first air chamber S1 and the second air chamber S2. The liquid level L of part P2 is at the same height.

When the operation of the wet dust collector 100 is started, the blower 70 (FIG. 1) is driven, and as the fan 71 rotates, the dust-containing airflow is introduced from the airflow introduction pipe 9 into the first air chamber S1. The dust-containing airflow introduced into the first air chamber S1 enters the narrowed portion G through the inlet 37 between the outer cylinder 33 and the horizontal plate 35, as shown by the arrow in FIG. Due to the pressure loss generated when the dust-containing airflow passes through the narrowed portion G, the air pressure in the second air chamber S2 becomes lower than the air pressure in the first air chamber S1. That is, a pressure difference (static pressure) is generated between the first air chamber S1 and the second air chamber S2.

Due to this pressure difference, the liquid level of the first storage unit P1 drops to L1, while the liquid level of the second storage unit P2 rises to L2. That is, the liquid W of the second storage portion P2 is lifted by the pressure difference. Here, the upper end of the large diameter portion 34a of the inner cylinder 34 is set at a position X lower than the liquid level L2 when the liquid W is lifted. As a result, a constant amount of liquid Wf corresponding to the difference in height between L2 and X overflows from the second storage portion P2. The overflowed liquid Wf cannot flow down to the narrowed portion G due to the upward airflow passing through the narrowed portion G.

Therefore, the dust-containing airflow that has passed through the narrowed portion G comes into contact with the overflowing liquid Wf and begins to agitate the liquid Wf. As shown in FIG. 6, the liquid Wf at this time exhibits a state like the initial stage in which the fountain is ejected. Then, in the steady state, as shown in FIG. 7, the overflowed liquid Wf is further agitated by the dust-containing airflow that continuously passes through the narrowed portion G, and becomes a state like a fountain that has been blown up high. As a result, sufficient gas-liquid contact is performed between the dust-containing airflow and the liquid Wf, and the dust in the airflow is collected in the liquid. The collected dust is settled on the bottom of the tank 3 (FIG. 1) and discharged when the tank 3 is washed.

As described above, in the wet dust collector 100 of the first embodiment, gas-liquid contact is performed in the second air chamber S2, that is, on the secondary side, while the liquid Wf overflowing with the dust-containing airflow passing through the constriction portion G is blown up. It is not necessary to strictly control the liquid level on the primary side (the liquid level of the first storage unit P1) as compared with the case where the gas-liquid contact is performed while winding up the liquid on the primary side as in Patent Document 1. Further, also on the secondary side, by appropriately setting the upper end position X of the inner cylinder 34, a certain amount of liquid Wf required for gas-liquid contact can be reliably overflowed, so that the liquid level on the secondary side can be ensured. Management is virtually unnecessary. Therefore, according to the present embodiment, it is possible to efficiently collect dust without strict liquid level control. The present invention does not exclude the provision of the liquid level adjusting means on the primary side or the secondary side, and the liquid level adjusting means may be provided as needed (see, for example, FIG. 12 described later).

Further, in Patent Document 1, in the case of gas-liquid contact, a liquid heavier than air must be wound up on the primary side of the S-shaped impeller, so that the pressure loss in the S-shaped impeller increases. On the other hand, in the present embodiment, it is not necessary to wind up the liquid at the time of gas-liquid contact, and the liquid overflows due to the pressure difference (static pressure) between the primary side and the secondary side, so that the pressure loss in the narrowed portion G is increased. small. Therefore, according to the present embodiment, it is possible to obtain the same or higher collection efficiency with less pressure loss than the S-shaped impeller type wet dust collector.

Further, at the manufacturing site of a food factory, it is normal to wash the cooking tank and the like from the viewpoint of hygiene and safety, and the dust collector is also required to be able to wash the entire device. However, in a wet dust collector using an S-shaped impeller, since the structure inside the main body is complicated, it is difficult to clean the inside, and it is practically impossible to wash the inside completely. However, in the wet dust collector 100 of the present embodiment, since the S-shaped impeller having a complicated shape is not used, the inside can be easily washed and the whole can be washed.

FIG. 8 is a schematic cross-sectional view showing a second embodiment of the present invention. In FIG. 8, parts having the same functions as those in FIG. 1 are designated by the same reference numerals as those in FIG. 1 (the same applies to FIGS. 9 and below). In the present embodiment, the baffle 41 and the opening plate 42 are arranged close to each other, and a narrowed portion G'(second narrowed portion) is formed between the peripheral edge of the opening 42a of the opening plate 42 and the baffle 41. Has been done. Other configurations are basically the same as those in FIG.

In FIG. 8, the dust-containing airflow introduced from the airflow introduction pipe 9 into the first air chamber S1 passes through the narrowed portion G (first narrowed portion) between the outer cylinder 33 and the inner cylinder 34 and overflows. The point of contact with the liquid Wf is the same as that of the first embodiment of FIG. In the second embodiment, the airflow that has passed through the narrowed portion G and made gas-liquid contact is further passed through the narrowed portion G'to make gas-liquid contact. As described above, the liquid that collides with the baffle 41 is reflected and falls downward, so that when the airflow passes through the narrowed portion G', the airflow and the falling liquid come into contact with each other. According to this embodiment, since the gas-liquid contact is performed in two stages, the collection performance can be improved.

FIG. 9 is a schematic cross-sectional view showing a third embodiment of the present invention. In the present embodiment, the inner cylinder is composed of an upper inner cylinder 341 (upper second partition wall) and a lower inner cylinder 342 (lower second partition wall) arranged so as to be displaced in the vertical direction. An upper stenosis portion Ga (upper first stenosis portion) is formed between the outer cylinder 33 and the upper inner cylinder 341, and a lower stenosis portion Gb (lower stenosis portion Gb) is formed between the outer cylinder 33 and the lower inner cylinder 342. Lower first stenosis) is formed. Further, the second storage portion is composed of an upper storage portion P2a (upper second storage portion) formed by the upper inner cylinder 341 and a lower storage portion P2b (lower second storage portion) formed by the lower inner cylinder 342. Become. Other configurations are basically the same as those in FIG.

In FIG. 9, the dust-containing airflow introduced from the airflow introduction pipe 9 into the first air chamber S1 passes through the lower constriction portion Gb and then comes into contact with the liquid Wf overflowing from the lower storage portion P2b, followed by the upper constriction. After passing through the portion Ga, it comes into contact with the liquid Wf overflowing from the upper storage portion P2a. That is, also in the third embodiment, since the gas-liquid contact is performed in two stages, the collection performance can be improved.

FIG. 10 is a schematic cross-sectional view showing a fourth embodiment of the present invention. In the present embodiment, the flow of the air flow is opposite to that in the first to third embodiments. Therefore, the airflow introduction pipe 9 shown in FIG. 8 and the like is replaced with the airflow discharge pipe 9', the outer cylinder 33 is replaced with the inner cylinder 33', and the inner cylinder 34 is replaced with the outer cylinder 34'. The inner cylinder 33'corresponds to the "first partition wall" in the present invention, and the outer cylinder 34'corresponds to the "second partition wall" in the present invention. The inside of the inner cylinder 33'is the first air chamber S1, and the outside of the inner cylinder 33' is the second air chamber S2. The first storage unit P1 is inside the outer cylinder 34'and communicates with the first air chamber S1, and the second storage unit P2 is outside the outer cylinder 34' and communicates with the second air chamber S2. Communicate with.

As shown by the arrow, the dust-containing airflow introduced into the first air chamber S1 passes through the narrowed portion G between the inner cylinder 33'and the outer cylinder 34', and the liquid overflows from the second storage portion P2. Contact with Wf. This point is the same as that of the first embodiment. The airflow in which dust is collected by gas-liquid contact passes through the demista 5 and then flows out from the airflow discharge pipe 9'. According to this fourth embodiment, the air flow flows from the inside to the outside, and the flow velocity decreases toward the outside, so that there is an advantage that the generation of liquid W droplets can be suppressed.

FIG. 11 is a schematic cross-sectional view showing a fifth embodiment of the present invention. In this embodiment, the horizontal plate 35 (FIG. 1) used in the first embodiment is omitted. Therefore, the dust-containing airflow introduced from the airflow introduction pipe 9 into the first air chamber S1 comes into contact with the liquid W of the first storage portion P1 before flowing into the narrowed portion G, and the first gas on the primary side. Liquid contact is made. After that, the airflow flows into the second air chamber S2 through the narrowed portion G, and the second gas-liquid contact is performed on the secondary side. Therefore, also in this embodiment, since the gas-liquid contact is performed in two stages, the collection performance can be improved.

FIG. 12 is a schematic cross-sectional view showing a sixth embodiment of the present invention. In the present embodiment, a liquid level adjusting means for controlling the liquid level on the primary side is provided. The liquid level adjusting means includes an overflow pipe 60 and a water sealing device 61. When the liquid W is supplied to the primary storage section P1 from the liquid introduction pipe 10 (see FIG. 1), the liquid level Y of the primary storage section P1 rises, and the liquid level Y exceeds the upper end position H of the overflow pipe 60, the liquid overflows. The liquid flows into the pipe 60, and the excess liquid is discharged to the outside of the machine through the water sealing device 61. Therefore, the liquid level Y of the primary storage unit P1 can always be kept below the upper end position H of the overflow pipe 60. As described above, even when the liquid level adjusting means is provided, it is not necessary to strictly control the liquid level on the primary side as in the conventional case, so it is sufficient to provide a simple liquid level adjusting means as in the present embodiment. is there.

13A and 13B are the seventh embodiment of the present invention, in which FIG. 13A is an external view of the wet dust collector 100, FIG. 13B is a perspective view showing the inside of the wet dust collector 100, and FIG. 13C is a cross-sectional view. The wet dust collector 100 includes a box-shaped tank 80, an airflow introduction pipe 84 communicating with the inside of the tank 80, and an airflow discharge pipe 85. In the present embodiment, partition plates 81 and 82 made of a plate body are provided instead of the outer cylinder 33 and the inner cylinder 34 of the first embodiment. The partition plate 81 is an example of the "first partition wall" in the present invention, and the partition plate 82 is an example of the "second partition wall" in the present invention.

The partition plate 81 is sandwiched between the first air chamber S1 on one side and the second air chamber S2 on the other side. The airflow introduction pipe 84 communicates with the first air chamber S1, and the airflow discharge pipe 85 communicates with the second air chamber S2. Further, the first air chamber S1 side is the first storage portion P1 and the second air chamber S2 side is the second storage portion P2 with the partition plate 82 interposed therebetween. The partition plate 82 has an L-shaped bent portion 82a protruding toward the partition plate 81 at the upper portion, and a narrowed portion G is formed between the bent portion 82a and the partition plate 81.

Also in the wet dust collector 100 of the seventh embodiment, according to the same principle as that of the first embodiment, the dust-containing airflow flowing from the airflow introduction pipe 84 and passing through the constricted portion G is the first air chamber S1 and the second air chamber. Due to the pressure difference with S2, it comes into contact with the liquid Wf overflowing from the second storage portion P2, and dust is collected. The airflow after dust collection flows out through the airflow discharge pipe 85 to a space provided with a baffle, a filter, or the like (not shown).

FIG. 14 shows an eighth embodiment of the present invention. This embodiment is an example in which the block including the tank 3, the cylindrical cylinder 4, and the demista 5 and the block including the filter unit 90 and the blower unit 7 are separately provided. The dust-containing airflow introduced from the airflow introduction pipe 9 flows into the filter unit 90 from the tank 3 through the cylindrical cylinder 4, the demister 5, and the duct 91, and the dust is removed by the filter 6 to form a clean airflow, which becomes a clean airflow and is a blower unit. It is discharged from the discharge hole 73 of 7. As a modification of the eighth embodiment, the airflow flowing through the duct 91 may be first introduced into the blower unit 7 and then discharged to the filter unit 90. In this case, the discharge hole 73 is provided in the filter unit 90.

FIG. 15 is a schematic cross-sectional view showing a ninth embodiment of the present invention. In each of the above-described embodiments, the liquid overflows using the pressure difference (static pressure) between the first air chamber S1 and the second air chamber S2, but in the ninth embodiment, the liquid is supplied to the storage portion. Overflow the liquid with.

In FIG. 15, a bottomed cylindrical container 39 having a side wall 39a and a bottom wall 39b is provided inside the outer cylinder 33. The upper surface of the container 39 is open so that liquid can be injected from above, and the inside is a storage portion P communicating with the second air chamber S2. A narrowed portion G is formed between the outer cylinder 33 and the side wall 39a of the container 39. Further, a supply path 62 for supplying the liquid from the outside to the storage unit P is provided so as to communicate with the second air chamber S2. When the wet dust collector 100 is in operation, the liquid is supplied from the supply path 62 to the storage unit P so that the liquid always overflows from the storage unit P. As a result, the overflowing liquid Wf and the dust-containing airflow that has passed through the narrowed portion G come into contact with each other, and the dust in the dust-containing airflow can be collected in the liquid.

According to the ninth embodiment, a constant amount of liquid Wf is always overflowed by adjusting the amount of liquid supplied from the supply path 62 without depending on the pressure difference (static pressure) of the air chambers S1 and S2. be able to. Further, if clean water is supplied as a liquid, it is possible to suppress water contamination in the dust collector.

FIG. 16 is a schematic cross-sectional view showing a tenth embodiment of the present invention. This embodiment is a modification of the ninth embodiment described above. In FIG. 16, the liquid supply path includes a first supply path 64 and a second supply path 65. The first supply path 64 supplies the liquid W (for example, clean water) into the dust collector from the outside through the first air chamber S1. The second supply path 65 supplies the liquid W supplied from the first supply path 64 to the storage unit P by a power source 66 such as a pump.

According to the tenth embodiment, a constant amount of liquid Wf is always overflowed by adjusting the supply amount of the liquid from the power source 66 without depending on the pressure difference (static pressure) of the air chambers S1 and S2. be able to. Further, by using the power source 66, the height of the container 39 can be arbitrarily set.

17A and 17B are other examples of the outer cylinder 33 and the inner cylinder 34, in which FIG. 17A is a perspective view, FIG. 17B is a top view, FIG. 17C is a side view, and FIG. A cross-sectional view of B is shown. In FIG. 17, the outer cylinder 33 and the inner cylinder 34 have folds Z at portions facing each other with the narrowed portion G in between. By providing such a fold portion Z, the passage area of the airflow in the narrowed portion G becomes large and the air volume increases, and the outer cylinder 33 and the inner cylinder 34 have the same device dimensions and more than in the case of making them cylindrical. The air volume can be processed. The partition plates 81 and 82 in FIG. 13 can also be provided with the same folds Z as described above.

FIG. 18 is a schematic cross-sectional view showing another example of the outer cylinder 33 (first partition wall) and the inner cylinder 34 (second partition wall). (A) is an example in which the inner cylinder 34 is formed into a funnel shape to form a narrowed portion G. (B) is an example in which the inner cylinder 34 is formed into a simple cylindrical shape to form a narrowed portion G. (C) is an example in which the lower portion of the outer cylinder 33 has a small diameter to form a narrowed portion G. (D) is an example in which the ring member K for adjusting the gap is fitted to the upper portion of the inner cylinder 34 to form the narrowed portion G. By using the ring members K having different thicknesses d, the gap dimension δ of the narrowed portion G can be adjusted.

FIG. 19 is a side view (partial cross-sectional view) showing the wet dust collector 200 according to the eleventh embodiment of the present invention. FIG. 20 is a schematic plan view of a main part of FIG. In each of the above-described embodiments, only one pair of the outer cylinder 33 and the inner cylinder 34 is provided, but in the eleventh embodiment, a plurality of pairs of the outer cylinder 33 and the inner cylinder 34 are provided. In the example of FIG. 20, four pairs of the outer cylinder 33 and the inner cylinder 34 are provided around the return pipe 11. Further, four baffles 41 are also provided corresponding to these sets (only two are shown in FIG. 19). It should be noted that only one tank 3 for storing the liquid W and one return pipe 11 are provided in common for each set of the outer cylinder 33 and the inner cylinder 34.

Further, in FIG. 1, the blower unit 7 accommodating the blower 70 is provided in the upper part of the wet dust collector 100, but in FIG. 19, the blower unit 7 is provided in the lower part of the wet dust collector 200. A duct 18 is provided across the upper part and the lower part of the wet dust collector 200. In the present embodiment, it is not essential to provide the blower unit 7 at the lower part, and the blower unit 7 may be provided at the upper part of the wet dust collector 200 as in FIG. 1. In this case, the duct 18 is unnecessary.

In FIG. 19, the dust-containing airflow introduced from the airflow introduction pipe 9 passes through the narrowed portion G between the outer cylinder 33 and the inner cylinder 34, and dust is removed by the above-mentioned principle, and the baffle 41 and the demista 5 are removed. , And after passing through a filter (not shown), it becomes a clean air flow and flows into the duct 18. Then, this clean air flow descends in the duct 18, flows into the blower unit 7 through the internal space of the base 19, and is discharged from the discharge hole 73 by the rotation of the fan 71.

According to the eleventh embodiment, since the narrowed portions G between the outer cylinder 33 and the inner cylinder 34 are provided at a plurality of locations, the amount of gas passing through the narrowed portion G increases, and the air volume is increased. Can be done. Further, since the blower unit 7 is provided in the lower part of the wet dust collector 200, there is an advantage that maintenance work (filter replacement, etc.) from above can be easily performed. In the first to eighth embodiments described above, a plurality of sets of the outer cylinder 33 and the inner cylinder 34 may be provided as in the eleventh embodiment.

In the present invention, various embodiments as described below can be adopted in addition to the embodiments described above.

In the embodiment of FIG. 9, two inner cylinders 341 and 342 are provided so that gas-liquid contact is performed in two stages, but three or more inner cylinders are provided and gas-liquid contact is performed in multiple stages. It may be done.

Further, by forming a structure in which the embodiment of FIG. 8 and the embodiment of FIG. 9 are combined, gas-liquid contact may be performed in multiple stages. In addition, each of the above-described embodiments can be combined as appropriate.

In the embodiment of FIG. 1, an example in which the return pipe 11 for collecting the liquid falling from the baffle 41 is provided is shown, but the return pipe 11 may be omitted. Even if there is no return pipe 11, a part of the liquid reflected by the baffle 41 is collected in the second storage portion P2 through the pipe 36.

In the embodiment of FIG. 1, an example is shown in which the horizontal center axis of the airflow introduction pipe 9 intersects the vertical center axis of the tank 3, but the horizontal center axis of the airflow introduction pipe 9 is shifted from the vertical center axis of the tank 3. Centrifugal force may be applied to the introduced airflow by using a so-called tangential inlet at the communication port of the joint portion between the airflow introducing pipe 9 and the tank 3.

In the embodiment of FIG. 1, the baffle 41 is formed of a bottomed cylinder, but the baffle 41 may be formed in another shape such as an umbrella shape.

Although the embodiment of FIGS. 15 and 16 shows an example in which the container 39 has a bottomed cylindrical shape, the shape of the container 39 is not limited to this, and may be, for example, a bowl-shaped shape.

In each of the above embodiments, the wet dust collector 100 for the food industry is taken as an example, but the present invention can also be applied to a wet dust collector used in an industry other than the food industry.

5 Demista 11 Return pipe 32 Storage section 33 Outer cylinder (1st partition wall)
34 Inner cylinder (second partition wall)
34a Large diameter part 34b Small diameter part 341 Upper inner cylinder (upper second partition wall)
342 Lower inner cylinder (lower second partition wall)
39 Container 41 Baffle 42 Opening plate 42a Opening 62 Supply path 64 Supply path (first supply path)
65 Supply path (second supply path)
66 Power source 81 Partition plate (1st partition wall)
82 Partition plate (second partition wall)
100, 200 Wet dust collector G Constriction (1st constriction)
G'stenosis (second stenosis)
Ga upper stenosis (upper first stenosis)
Gb lower stenosis (lower first stenosis)
P Reservoir P1 1st Reservoir P2 2nd Reservoir P2a Upper Reservoir (Upper 2nd Reservoir)
P2b Lower storage section (lower second storage section)
S1 1st air chamber S2 2nd air chamber W liquid Wf Overflowing liquid Z folds

Claims (17)

The storage section where the liquid is stored and
The first air chamber on the primary side where the dust-containing airflow is introduced, and
The second air chamber on the secondary side that discharges the airflow after dust collection,
A first partition wall that separates the first air chamber and the second air chamber is provided.
In a wet dust collector that brings the dust-containing airflow flowing from the first air chamber to the second air chamber into contact with the liquid in the storage portion and collects the dust in the dust-containing airflow into the liquid.
A second partition wall that divides the storage unit into a first storage unit that communicates with the first air chamber and a second storage unit that communicates with the second air chamber.
A first constricted portion formed between the first partition wall and the second partition wall is further provided.
When the dust-containing airflow flows from the first air chamber through the first constriction portion to the second air chamber, the pressure difference between the first air chamber and the second air chamber causes the dust-containing air flow from the second storage portion. A wet dust collector, characterized in that the overflowed liquid and the dust-containing airflow that has passed through the first constricted portion come into contact with each other, and dust in the dust-containing airflow is collected in the liquid. In the wet dust collector according to claim 1,
The upper end of the second partition wall is set at a position lower than the liquid level when the liquid in the second storage portion is lifted by the pressure difference.
A wet dust collector, characterized in that a constant amount of liquid always overflows from the second storage portion according to the difference in height between the upper end of the second partition wall and the liquid level. In the wet dust collector according to claim 1 or 2.
The first partition wall and the second partition wall are each made of a hollow tubular body.
The outside of the first partition wall is the first air chamber, and the inside is the second air chamber.
A wet dust collector characterized in that the outside of the second partition wall is the first storage portion and the inside is the second storage portion. In the wet dust collector according to claim 1 or 2.
The first partition wall and the second partition wall are each made of a hollow tubular body.
The inside of the first partition wall is the first air chamber, and the outside is the second air chamber.
A wet dust collector characterized in that the inside of the second partition wall is the first storage portion and the outside is the second storage portion. In the wet dust collector according to claim 1 or 2.
The first partition wall and the second partition wall are each made of a plate body.
The first air chamber is on one side and the second air chamber is on the other side of the first partition wall.
A wet dust collector characterized in that the first air chamber side is the first storage portion and the second air chamber side is the second storage portion across the second partition wall. In the wet dust collector according to any one of claims 1 to 5.
A wet dust collector, wherein the first partition wall and the second partition wall have folds at portions facing each other with the first constriction portion interposed therebetween. In the wet dust collector according to any one of claims 1 to 6.
A wet dust collector provided with a return pipe for returning the liquid scattered in contact with the dust-containing airflow to the first storage portion. In the wet dust collector according to any one of claims 1 to 7.
A wet dust collector characterized in that a baffle for receiving a liquid scattered in contact with the dust-containing airflow is provided above the second storage portion. In the wet dust collector according to claim 8.
A wet dust collector characterized in that a demister for receiving droplets of the liquid is provided above the baffle. In the wet dust collector according to claim 8 or 9.
An opening plate having an opening at a position facing the baffle is provided below the baffle.
A wet dust collector characterized in that a second narrowed portion is formed between the peripheral edge of the opening of the opening plate and the baffle. In the wet dust collector according to any one of claims 1 to 10.
The second partition wall is composed of an upper second partition wall and a lower second partition wall arranged so as to be displaced in the vertical direction.
The first constriction portion is an upper first constriction portion formed between the first partition wall and the upper second partition wall, and a lower first constriction portion formed between the first partition wall and the lower second partition wall. Consists of 1 stenosis
The second storage portion includes an upper second storage portion formed by the upper second partition wall and a lower second storage portion formed by the lower second partition wall.
The dust-containing airflow passes through the lower first constriction portion and then contacts the liquid overflowing from the lower second storage portion, and subsequently passes through the upper first constriction portion and then passes through the upper second storage portion. A wet dust collector characterized in that it comes into contact with the liquid that overflows from the part. In the wet dust collector according to any one of claims 1 to 11.
A wet dust collector characterized in that the dust-containing airflow is brought into contact with the liquid in the first storage portion before the dust-containing airflow flows from the first air chamber into the first constricted portion. In the wet dust collector according to any one of claims 1 to 12.
A wet dust collector characterized in that a plurality of pairs of the first partition wall and the second partition wall are provided. The storage section where the liquid is stored and
The first air chamber on the primary side where the dust-containing airflow is introduced, and
The second air chamber on the secondary side that discharges the airflow after dust collection,
A first partition wall that separates the first air chamber and the second air chamber is provided.
In a wet dust collector that brings the dust-containing airflow flowing from the first air chamber to the second air chamber into contact with the liquid in the storage portion and collects the dust in the dust-containing airflow into the liquid.
The storage portion is formed inside a container into which a liquid can be injected, and is provided so as to communicate with the second air chamber.
A constricted portion formed between the first partition wall and the container,
Further provided with a supply path for supplying the liquid to the reservoir,
When the dust-containing airflow flows from the first air chamber through the constricted portion to the second air chamber, the liquid overflowing from the reservoir due to the liquid supply from the supply path and the liquid passing through the constricted portion. A wet dust collector, characterized in that the dust in the dust-containing airflow comes into contact with the dust-containing airflow and the dust in the dust-containing airflow is collected in the liquid. In the wet dust collector according to claim 14,
A wet dust collector characterized in that a liquid is directly supplied from the supply path to the storage unit. In the wet dust collector according to claim 14,
The supply passage includes a first supply passage that supplies liquid into the dust collector through the first air chamber, and a second supply passage that supplies the liquid supplied from the first supply passage to the storage unit by a power source. A wet dust collector characterized by consisting of. In the wet dust collector according to any one of claims 14 to 16.
A wet dust collector, characterized in that the liquid supplied from the supply path to the storage unit is clean water.

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