KR970010163B1 - Dust collector having hollow filter - Google Patents

Abstract

None.

Description

Dust Collector with Hollow Filter

1 is an explanatory diagram showing the principle of the contents of the present invention.

2 is a schematic cross-sectional view of a bag filter dust collector.

3 is a perspective view of the III-III line in FIG.

4 is a sectional view of the principal parts showing the branch passage configuration according to the second embodiment;

Fig. 5 is a bottom view of the main portion showing the branch passage structure according to the third embodiment.

6A and 6B are cross-sectional views of the blow-tubs according to the fourth embodiment, respectively.

7 is a cross-sectional view of the blow-tub of a fifth embodiment.

8 is a sectional view showing a modification of the blow-tub of Example 5;

* Explanation of symbols for main parts of the drawings

5 Hollow Filter 14 Blow-Tub

15: supply source 16: branch passage

19: single tube 21: wind blower

The present invention relates to a dust collector equipped with a hollow filter such as a bag filter dust collector, and is an improvement of a dust removal mechanism for removing particles such as dust attached to the outer surface of the hollow filter by back washing.

Dust collectors for cleaning hollow filters by backwashing are known, for example, from Japanese Patent Laid-Open No. 63-93318. Thereby, as shown in FIG. 2, the blow-tub 14 branched from the header 17 is arrange | positioned according to the arrangement line of the bag filter 5, and it protrudes on the lower surface of the blow-tub 14. Jet air is ejected from the single pipe 19 to blow off dust attached to the filter outer surface, and to clean and regenerate the filter surface wall. The supply of compressed air to the blow-tub 14 is controlled by an electronically operated on / off valve 18 placed between the blow-tub 14 and the header 17. In many cases, the solenoid valve 18 is opened and operated at a predetermined interval, and the opening time per turn is about 0.05-1 seconds. In addition, the internal pressure of the jet air blown out of the short pipe 19 is 3-7 kg / cm 2.

According to the form of supplying the jet air through the blow-tub 14 and the end pipe 19 installed on the lower surface as described above, it is possible to simultaneously exhaust the bag filters in each row, but the difference in the degree of exhaustion of the individual bag filters is different. There is a problem with it. The degree of exhaustion of the bag filter far from the inlet of the blow-tub-tub (head end of the header) is high, but the closer to the inlet, the lower the degree of exhaustion.

The difference in the degree of exhaustion due to the difference in distance from the inlet is because the jet air is supplied in pulse form for a very short time.

The high pressure air travels on the highway and impinges on the tube wall while filling the blow-tube. Of course, some of the compressed air is ejected from the short pipe during movement. However, a sufficient amount of compressed air to hit the bag filter of each row collides with the deep end wall of the blow-tube, so that most of the energy at that speed is converted into energy of pressure. For this reason, the pressure inside the pipe is higher near the deep end wall, and the far end pipe farther from the inlet causes the jet of a large amount of jet air, which causes the exhaustion to be disturbed.

As described above, although the dust bag is repeatedly exhausted, the bag filter is dust-collected as it is, and there is a problem in that dust can not be separated efficiently.

An object of the present invention is to equalize the amount of jet streams blown out to each filter to make it possible to ensure the exhaustion of the hollow filter which is simultaneously exhausted and to improve the dust collection efficiency of this type of dust collector.

The dust collector of the present invention is provided in a dust collector provided with a group of hollow filters (5) inside the housing (1) and a dust extraction mechanism for ejecting jet air (A) for backwashing in the hollow filters (5). An air supply source 15 and each hollow filter for supplying compressed gas to the plurality of blow-tubs 14 and each of the blow-tubs 14 having mechanisms arranged corresponding to the array lines of the hollow pallet 5. A plurality of branch passages (16) provided in the blow-tubs (14) corresponding to the openings in (5), the opening area of the branch passages (16) and the passage resistance of the branch passages (16); The jetted air flow A in the branch passages 16 is made uniform so that the effective area of the water-winding wall 21 installed at the inlet of the branch passage 16 is at least one of the changing elements. The change element is characterized in that it is changed large and small toward the deep end at the inlet of the blow-tub 14.

Specifically, the branch passage 16 is formed in the short pipe 19 or the opening (hole), and the cross-sectional area thereof is diminished toward the deep end at the inlet of the blow-tub 14.

Toward the deep end at the inlet of the blow-tub 14, the number of branch passages 16 corresponding to each hollow filter 5 is reduced.

In addition, the present invention is a dust collector in which a group 1 of hollow filters 5 and a dust extraction mechanism for ejecting jet air A for backwashing are installed in each of the hollow filters 5 in the housing 1. In the air conditioner, the exhaust mechanism is provided with a plurality of blow-tubs 14 and a supply air source 15 for supplying compressed gas to each of the blow-tubs 14 arranged with respect to the array line of the hollow filter 5. It includes a plurality of branch passages 16 installed in the blow-tub 14 corresponding to the openings of the hollow filters 5, and the cross-sectional area of the blow-tub 14 is entered. From towards the deep end.

Specifically, the cross section of the blow-tub 14 is reduced, and the branch passage 16 is formed in the short pipe or the opening (hole), and the cross-sectional area is directed toward the deep end from the inlet of the blow-tub 14. You may diminish.

For example, changing the diameter of the pipe forming the branch passage 16 to reduce the opening area of the branch passage 16 from the inlet of the blow-tub 14 toward the deep end, the branch passage 16 close to the inlet. ), The inflow of compressed gas decreases and the closer it is to the deep end, the smaller the compressed gas inflow. As a result, the total ejection amount of the jet streams A ejected with respect to each filter 5 can be made uniform.

Diminishing the passage resistance of the branch passage 16 toward the inlet at the deep end or diminishing the effective area of the wind blower wall 21 at the inlet of the branch passage 16 toward the deep end at the inlet side. Therefore, the total ejection amount of the jet stream A can be made uniform as the opening area is changed.

As the cross-sectional area of the blow-tub 14 decreases toward the deep end at the inlet, the compressed gas moves into the blow-tub 14 with the energy of velocity continuously converted to the energy of pressure. Therefore, a sufficient amount of compressed gas is also ejected at a higher pressure in the branch passage 16 on the side close to the inlet. When a sufficient amount of jet streams A are ejected from each branch passage 16 in turn on the inlet side, the amount of compressed gas reaching the deep inside is reduced, so that the pressure increase deep inside can be sufficiently suppressed.

In the present invention, at least one of the blow-tubs 14 may be used as the changing area by using the opening area of the branch passage 16, the passage resistance, or the effective area of the wind wave wall 21 installed at the entrance thereof. The amount of jet stream A blown out for each filter 5 was uniformed by changing from the inlet to the deep inside.

Alternatively, the cross-sectional area of the blow-tub 14 is reduced toward the deep end at the inlet, so that the amount of jet stream A blown out to each filter 5 is equalized.

Therefore, according to the dust collector of the present invention, it is possible to evenly and uniformly regenerate the hollow filter 5 which is dust-treated at the same time with respect to dust exhaustion by backwashing, and improve the separation efficiency of the dust collector and the processing capacity.

1 to 3 show an embodiment in which the present invention is applied to a bag filter dust collector.

In FIG. 2, reference numeral 1 denotes a housing of the dust collector, 2 a partition wall that divides the inside of the housing 1 into a lower dust collecting chamber 3 and an upper exhaust chamber 4, and 5 a hollow filter. (Bag filter). In the first group of the hollow filters 5, the upper end is fixed to the partition wall 2 so as to enter the dust collection chamber 3 on the main surface.

The gas containing dust is supplied into the dust collecting chamber 3 via the inlet 8 by an air blower or an intake apparatus other than the drawing, and is filtered while passing the hollow filter 5 from the outer surface to the inner surface. The clean gas after the filtration is taken out of the air from the outlet 9 provided in the exhaust chamber 4. In the center of the bottom wall of the dust collecting chamber 3, a blowout valve 7 for discharging the separated dust in an airlocked state is provided.

The hollow filter 5 is mounted on the upper end of the filter element 11 made of a non-woven cylindrical body having an open top, and a retaining frame 12 and a retaining frame 12 that retain the element 11 in a full length state. It consists of a venturi tube 13, etc. The group 1 hollow filter 5 is arrange | positioned in the state which forms a straight line longitudinally and horizontally in the dust collecting chamber 3.

According to the filtration treatment, dust adheres and accumulates on the outer surface of the hollow filter 5. A dust removal mechanism is provided to remove such adhered dust and to regenerate the filter surface wall in an appropriate state.

The dedusting mechanism comprises a blow-tub 14 and a blower source 15 for supplying compressed gas to each blow-tub 14 arranged along the line of the hollow filter 5. It consists of the branch passage 16 etc. which were provided in the lower surface of the blow-tub 14 corresponding to the opening part of the filter 5. The compressed gas supplied from the air supply source 15 is stored in the header 17, and the electronically operated on-off valve 18 installed between the header 17 and each blow-tub 14 is opened. It is supplied to each blow-tub 14 by opening and operating. In this embodiment, the branch pipe 16 is formed by fixing the short pipe 19 to the blow-tub 14.

The present invention is to form a branch passage 16 which is installed in each blow-tub-14 in order to evenly reproduce a group of the hollow filter (5) that is simultaneously dust-treated in the dust collector as described above Has characteristics.

As shown in FIG. 1 and FIG. 3, the branch passage 16 is formed by the short pipe 19, and the cross-sectional area thereof is largely set at the inlet (header 17 side end) side of the blow-tub 14 and deep. The closer to the end, the smaller the setting. That is, the opening area of the branch passage 16 is reduced by decreasing the passage end area of the short pipe 19 toward the deep end.

The compressed gas in the header 17 is fed to each blow-tub 14 every few tens of seconds to several minutes. At this time, the opening and closing time of the electronically operated on-off valve 18 is about 0.05-0.1 seconds.

The compressed gas supplied in the blow-tub 14 moves at a high speed toward the end of the tube while filling the tube and is ejected from each branch passage 16 to form a jet stream A. At this time, since the opening area of the branch passage 16 is set closer to the inlet of the blow-tub 14, the ejection amount of the jet stream A increases as the branch passage 16 near the inlet. On the other hand, the compressed gas that has traveled inside the pipe collides with the deep end wall and increases the pressure in the pipe near the deep end. Therefore, the branch passage 16 located at the deep end side ejects a sufficient amount of jet stream A despite the small opening area.

Therefore, if the rate of change of the opening area of the branch passage 16, the pressure of the compressed gas, and the pressure fluctuations caused by the impact at the deep end of the compressed gas are adjusted, the amount of jet stream A ejected from each branch passage 16 is equalized and simultaneously. It is possible to evenly regenerate the hollow filter 5 to be dust-treated.

4 shows an embodiment in which the shape of the branch passage 16 is changed. This forms all branch passages 16 as one single tube 19 of the same diameter, but increases the length of each tube from the entrance toward the deep end, i.e., changes the passage resistance of the branch passage 16 while changing the passage resistance of each branch passage. The amount of jet stream A blown out at (16) is equalized.

As shown in Fig. 5, this embodiment forms an opening (hole) of the blow-tub 14 and uses it as the branch passage 16, so that the number of openings and the diameter of the opening are deeply closed at the entrance. The amount of jet stream (A) was equalized while decreasing toward.

Of course, the same configuration can be taken when the branch passage 16 is formed by the single pipe 19. As the dust collector using the envelope-type hollow filter 5, since the individual filters 5 are subjected to the dust removal treatment in the plurality of branch passages 16, it is preferable to apply this embodiment.

In addition, one opening (hole) may be provided for each hollow filter 5, and the opening area may be reduced toward the deep end at the inlet.

FIG. 6A shows an embodiment (4) in which the shape of the inlet portion to the branch passage 16 is changed. This injects a part of the end pipe 19 forming the branch passage 16 into the blow-tub 14 so that the inlet is inclined in a direction opposite to the moving direction of the compressed gas and the inclination angle α of the inlet is blown. The effective area of the wind blower wall 21 is changed by setting the small toward the deep end at the inlet of the tub 14.

In addition to changing the inclination angle α of the inlet, the inclination angle α of the inlet may be kept constant and the direction of the inclined ellipsoid may be gradually changed to the transverse direction as shown in FIG. 6B. . In addition, when the blow-tub 14 is constituted by a pair of half-split cylinders, the wind walls 21 can be formed separately from the end pipe 19 and can be disposed near the inlet of each branch passage 16.

In each of the above embodiments, the structure of the branch passage 16 is changed to equalize the amount of the jet stream A, but the same result is obtained by changing the structure of the blow-tub 14.

As shown in FIG. 7, the blow-tub 14 is formed from the inclined tubular material, and the cross-sectional area thereof is reduced toward the deep end from the inlet. In this way, when the passage cross-sectional area is reduced toward the deep end, the compressed gas moves into the blow-tub 14 in a state in which energy of velocity is continuously converted to energy of pressure. For this reason, a sufficient amount of jet stream A is also ejected from the branch passage 16 close to the inlet.

It is possible to take a form other than the above to change the passage cross-sectional area. As shown in FIG. 8, the blow-tub 14 is formed in multistage tube shape, and the branch passage 16 is provided in the vicinity of each edge part 22. As shown in FIG.

In addition, you may combine the structure of the branch passage 16 of the said Example 1-4 with the structure which reduces the passage cross-sectional area of the blow-tub 14.

In addition to the above embodiments, as the hollow filter 5 to be subjected to dust removal, there are a ceramic filter, a sintered plastic filter, etc. that do not use the retaining frame 12. The venturi tube 13 may be omitted. In the case of a lot of exhaustion, compressed air is used as the compressed gas, and various kinds of gases may be used depending on the exhaust target such as steam or compressed nitrogen.

The blow-tub 14 does not need to be formed in a straight tube shape, but may be arranged in a U-shape or an L-shape in plan view. Moreover, the inlet position can be provided in the center part of the longitudinal direction of a pipe | tube.

This invention can be implemented combining suitably the content of Example (1) thru | or Example (5).

Claims (10)

Inside the housing 1, there is provided an exhausting mechanism for ejecting jet air A for backwashing inside the group 1 hollow filter 5, and the exhausting mechanism is arranged corresponding to the array line of the hollow filter 5; The blow-tubs 14 correspond to the plurality of blow-tubs 14, the air supply source 15 for supplying the compressed gas to each of the blow-tubs 14, and the openings of the respective hollow filters 5. 14 includes a plurality of branch passages (16) provided in (14), and the opening area of the branch passage (16), the passage resistance of the branch passage (16), and the water barrier wall (21) provided at the inlet of the branch passage (16). The change element is moved from the inlet of the blow-tub 14 toward the end deeper so that the ejection amount of the jet stream A in each branch passage 16 is uniform with at least one of the areas as the change element. Dust collector having a hollow filter (5), characterized in that the modification. A dust collector having a hollow filter according to claim 1, wherein a branch passage (16) is formed in the short pipe (19) or the opening, and its cross-sectional area is reduced toward the deep end from the inlet of the blow-tub (14). From the inlet of the blow-tub 14 toward the deep end of the claim 1 or 2, which is installed corresponding to each hollow filter 5 and reduced the number of branch passages 16 formed in the end pipe 19 or the opening. Dust collector with hollow filter. A dust collector having a hollow filter of claim 1, wherein branch passages (16) are formed of short pipes (19) and their respective pipe lengths are increased toward the deep end from the inlet of the blow-tub (14). The branch passage 16 is formed as a short pipe, and one end of the short pipe protrudes into the blow-tub, so that the inlet end thereof has an effective area of the blow wall 21 deep from the inlet of the blow-tub 14. A dust collector having a hollow filter of claim 1 cut out obliquely in a direction opposite to a direction of movement of compressed gas so as to decrease toward. Inside the housing 1, a group of hollow filters 5 and a dust removal mechanism for ejecting jet air A for backwashing are provided inside each hollow filter 5, and the exhaust mechanism is a hollow filter 5 Corresponds to the plurality of blow-tubs 14 and the air supply source 15 for supplying compressed gas to each of the blow-tubs 14 and the openings of the respective hollow filters 5. And a plurality of branch passages (16) installed in the blow-tubs (14) and having a hollow filter with a reduced cross-sectional area of the blow-tubs (14) from the inlet toward the end deep. A dust collector having a hollow filter of claim 6, wherein a branch passage (16) is formed in the short pipe (19) or the opening, and its cross-sectional area is tapered toward the end deep at the inlet of the blow-tub (14). In accordance with claim 6 or 7, the number of branch passages 16 formed in the end pipe 19 or the opening is formed corresponding to each hollow filter 5 toward the deep end from the inlet of the blow-tub 14. Dust collector with hollow filter. A dust collector having a hollow filter of claim 6, wherein the branch passages (16) are formed of short pipes (19) and their respective pipe lengths are increased toward the deep end at the inlet of the blow-tub (14). The branch passage 16 is formed of the short pipe 19, and one end of the short pipe protrudes into the blow-tub, so that the inlet thereof has an effective area of the blower wall 21 at the inlet of the blow-tub 14. Dust collector having a hollow filter of claim 1 which is cut in an oblique direction in a direction opposite to the direction of movement of the compressed gas to reduce toward the deep end in the.