JP3177825U - Candle type ceramic filter - Google Patents

Abstract

The present invention provides a candle-type ceramic filter having improved durability against vibration, having no risk of falling off even when used for a long period of time, and having a long life and high reliability.
A candle-type ceramic filter comprising a bottomed cylindrical filter body 10 and a flange portion 11, wherein a width d of the flange portion 11 is 1.6 to 5. 5 with respect to a thickness D of the filter body 10. The range is 0 times. In addition to increasing the strength of the flange portion 11, the thickness of the root portion from the open end of the filter body 10 of the flange portion to 300 mm in the length direction of the filter is 1.1 with respect to the thickness D of the filter body 10. It is more preferable to make it thick on the inner peripheral side or thick on the outer peripheral side so as to be in the range of ˜3 times.
[Selection] Figure 3

Description

  The present invention relates to a candle-type ceramic filter used in a filtration dust collector.

  A candle-type ceramic filter is a bottomed cylindrical ceramic filter that is open at one end and sealed at the other end. It is a high-temperature filter that removes soot and dust from waste incinerators and industrial furnaces. Often used in dust devices. For example, in a filtration dust collector equipped with a candle type ceramic filter, dust is collected on the outer peripheral surface of the candle type ceramic filter, and the collected dust is removed by a method of removing the dust with pulse air. .

  The candle-type ceramic filter used in the filtration dust collector is installed, for example, as described in Patent Document 1, by suspending it from the dust collector while holding the entire filter by fixing the flange provided on the outer periphery of the open end. Is done. Therefore, bending stress is repeatedly applied to the flange portion of the filter by vibration during dust collection operation and vibration generated every time dust is removed by pulse air. As a result, there is a problem that fatigue is accumulated in the flange portion, and finally a crack generated in the flange portion develops at or near the root portion of the filter, and the filter falls off from the dust collector.

  As shown in FIG. 1, a general candle-type ceramic filter 1 currently used is composed of a filter body 10 and a flange portion 11, and the overall filter length L is from 1000 mm to 3000 mm, and the filter outer diameter R1 is from 90 mm to 150 mm. Variety. As general dimensions, the filter total length L is 2000 mm or 3000 mm, the filter outer diameter R1 is 150 mm, the filter inner diameter R2 is 110 mm, and the wall thickness D of the filter body is 20 mm. As shown in FIG. 2, the general dimensions of the flange portion 11 are a width d of the flange portion 11 of 30 mm, an outer diameter r1 of 195 mm, and an inner diameter r2 of 110 mm, which is the same as the filter inner diameter R2.

JP 2005-224734 A

  As described above, conventional candle-type ceramic filters are generated in and around the flange as a result of repeated bending stress applied to the flange due to vibration during dust collection and vibration generated every time dust is removed by pulsed air. As a result, the cracks progressed and the filter was easily removed from the dust collector. In particular, the filter with a total length of 3000 mm is longer and heavier than the 2000 mm type, so the load on the flange due to vibration and shaking is large, and the risk of falling off is high.

  In view of such conventional circumstances, the present invention improves the durability against vibration during dust collection operation in a filtration dust collector and vibration generated every time dust is removed by pulsed air. An object of the present invention is to provide a candle-type ceramic filter that has no risk of falling off due to the progress of cracks and has a long life and high reliability.

  In order to achieve the above object, a candle-type ceramic filter provided by the present invention has a bottomed cylindrical filter body having one end opened and the other end sealed, and an open end of the filter body on the outer peripheral side. A candle-type ceramic filter consisting of a flange part that protrudes and is integrally formed, and the width of the flange part in the length direction of the filter is in the range of 1.6 to 5.0 times the wall thickness of the filter body It has become.

  In the above-mentioned candle-type ceramic filter according to the present invention, the width of the flange portion in the length direction of the filter is in the range of 1.6 to 5.0 times the wall thickness of the filter body, and from the open end of the filter body. It is preferable that the thickness of the base portion up to 300 mm in the length direction of the filter is thick on the inner peripheral side or thick on the outer peripheral side in a range of 1.1 to 3 times the wall thickness of the filter body. .

  According to the present invention, it is possible to increase the strength of the flange part that is suspended from the dust collector while holding the entire filter, preventing cracks from occurring in the flange part and its vicinity during use, and using it for a long time. Even in this case, it is possible to provide a candle-type ceramic filter that does not have a risk of falling off. Therefore, the candle-type ceramic filter according to the present invention is extremely useful as a long-life and reliable candle-type ceramic filter even in response to the recent trend of increasing the filter collection size to increase the dust collection efficiency. It is.

It is a schematic side view showing a candle type ceramic filter. It is a schematic sectional drawing which shows the filter base part provided with the conventional general flange part in a candle type ceramic filter. It is a schematic sectional drawing which shows the filter base part provided with the flange part in one specific example of the candle type ceramic filter by this invention. It is a schematic sectional drawing which shows the filter base part provided with the flange part in another specific example of the candle type ceramic filter by this invention. It is general | schematic sectional drawing which shows the filter base part provided with the flange part in another specific example of the candle type ceramic filter by this invention.

  The candle-type ceramic filter of the present invention is similar to the general candle-type ceramic filter shown in FIG. 1, and has a bottomed cylindrical filter body 10 that is open at one end and sealed at the other end. It is comprised by the flange part 11 which protruded to the outer peripheral side and was integrally formed in the open one end part. In the present invention, in the candle type ceramic filter 1, the width d of the flange portion 11 in the length direction of the filter is made longer (thicker) than before, thereby increasing the fracture area of the flange portion with respect to bending stress and increasing the strength. To improve the durability of the filter against vibration.

  Specifically, as shown in FIG. 3, the width d of the flange portion 11 in the length direction of the filter is in a range of 1.6 to 5.0 times the wall thickness D of the filter body 10. If the width d of the flange portion 11 in the length direction of the filter is less than 1.6 times the wall thickness D of the filter body 10, sufficient strength cannot be achieved, and cracks will develop due to prolonged use. There is a risk of falling out. On the contrary, even if it exceeds 5.0 times, further increase in strength of the flange portion 11 cannot be expected, and since the width of the flange portion 11 becomes too long, it becomes difficult to hang the filter on the dust collector.

  The specific dimensions will be described. In the case of a general candle type ceramic filter having a filter total length L of 2000 mm or 3000 mm, a filter outer diameter R1 of 150 mm, a filter inner diameter R2 of 110 mm, and a filter body wall thickness D of 20 mm, Whereas the width d of the flange portion 11 was 30 mm, the width d of the flange portion 11 is 1.6 to 5.0 times the wall thickness D (= 20 mm) of the filter body 10 in the candle type ceramic filter of the present invention. That is, the range is 32 to 100 mm.

  Further, as a more preferable embodiment of the candle type ceramic filter according to the present invention, the width d of the flange portion is in the range of 1.6 to 5.0 times the wall thickness D of the filter body 10 as described above, and the filter body 10 The thickness of the base portion from the open end of the filter to 300 mm in the length direction of the filter is increased on the inner peripheral side so as to be in the range of 1.1 to 3 times the thickness D of the filter body 10 or It can be thickened on the outer peripheral side. Thus, by increasing the width d of the flange portion in the length direction of the filter and increasing the thickness of the root portion from the open end to 300 mm in the length direction of the filter, the fracture area against bending stress can be reduced. It becomes larger and can achieve further increase in strength and improvement in durability against vibration.

  Specifically, as shown in FIG. 4, one of the preferred embodiments described above is that the thickness D1 of the root portion from the open end of the filter body 10 to 300 mm in the length direction of the filter is the thickness of the filter body 10. The thickness is increased in the range of 1.1 to 3 times the thickness D on the inner peripheral side. For example, in the case of the above-described candle type ceramic filter having a general size, the width d of the flange portion 11 is in the range of 32 to 100 mm which is 1.6 to 5.0 times the wall thickness D (= 20 mm) of the filter body 10. At the same time, the thickness D1 of the root portion is increased to the inner peripheral side so as to be in the range of 1.1 to 3 times the thickness D (= 20 mm) of the filter body 10, that is, 22 to 60 mm.

  In addition, as shown in FIG. 5, another preferable aspect is that the thickness D2 of the root portion from the open end of the filter body 10 to 300 mm in the length direction of the filter is the thickness of the filter body 10. Thicken to the outer peripheral side in a range of 1.1 to 3 times that of D. For example, in the case of the above-described candle type ceramic filter having a general size, the width d of the flange portion 11 is in the range of 32 to 100 mm which is 1.6 to 5.0 times the wall thickness D (= 20 mm) of the filter body 10. At the same time, the thickness D2 of the root portion is increased to the outer peripheral side so as to be in the range of 1.1 to 3 times the thickness D (= 20 mm) of the filter body 10, that is, 22 to 60 mm.

  The candle-type ceramic filter according to the present invention can be produced by wet-molding ceramic fibers into a bottomed cylindrical shape, and drying and firing. In addition, the material of the candle-type ceramic filter according to the present invention has been conventionally applied to a high-temperature exhaust gas treatment filter as long as it can sufficiently withstand a high temperature of 900 ° C. or higher, which is the maximum use temperature of the filter. For example, it may be alumina, alumina silica, cordierite, mullite, or the like.

  Next, a method for producing a candle-type ceramic filter according to the present invention will be specifically described taking the case of a bottomed cylindrical filter made of the ceramic fiber as an example. First, the ceramic fiber as the main component is dispersed in water together with an inorganic binder such as silica sol or alumina sol to form a slurry, and after adding a polymer flocculant to form an aggregate, a mesh having a predetermined bottomed cylindrical shape And suction filtration using a shaped mold. After the aggregates of ceramic fibers and inorganic binder are deposited on the mold in this way, the deposited bottomed cylindrical molded body is removed from the mold and dried, or after drying, the temperature is further 1000 ° C. or higher. By firing at a temperature, the candle-type ceramic filter of the present invention is obtained.

  In addition, in the molding method of the above-mentioned bottomed cylindrical molded body, a slurry mold is poured into the inside of the bottomed cylindrical mold, and deposited and molded inside the mold, and a bottomed cylindrical mold There is a male mold molding in which is molded in a slurry and deposited on the outside of the mold. For forming the bottomed cylindrical molded body in the case where the root portion shown in FIG. 4 which is one of the preferred embodiments is thickened on the inner peripheral side, female molding is basically used. For forming a bottomed cylindrical molded body in the case where the root portion shown in FIG. 5 is thickened on the outer peripheral side, male molding is basically used.

[Example 1]
Alumina silica fiber as ceramic fiber was dispersed in water together with an inorganic binder silica sol to form a slurry, and a polymer flocculant was added thereto to form an aggregate. A mesh-shaped mold having a bottomed cylindrical shape was immersed in this slurry and suction filtered to deposit ceramic fiber and inorganic binder aggregates on the outside of the mold. Thereafter, the deposited cylindrical molded body with a bottom was removed from the mold, dried, and then fired at a temperature of 1000 ° C. or higher to produce a candle-type ceramic filter having the shape shown in FIG.

  At that time, the dimensions of the candle-type ceramic filter are as follows: the total length L of the filter is 2000 mm, the outer diameter R1 of the filter is 150 mm, the inner diameter R2 of the filter is 110 mm, and the wall thickness D of the filter body is 20 mm. It was changed in the range of 30 to 45 mm. That is, the width d of the flange portion 11 is set to 30 mm, which is the same as that in the conventional example in the sample 1, 32 mm in the sample 2 (1.6 times the wall thickness D of the filter body 10), and 100 mm in the sample 3 (the wall thickness D of the filter body 10). 2.25 times).

  About each obtained candle type | mold ceramic filter, when the lateral load resistance which shows the intensity | strength of a flange part was measured, the sample 1 of a prior art example is about 5 kgf, whereas the sample 2 by this invention is 5.5 kgf. The sample 1 was 1.1 times, and the sample 3 was 8.5 kgf, which was 1.7 times that of the conventional sample 1. Thus, in each candle type ceramic filter of the present invention in which the width d of the flange portion 11 was made longer (thicker) than before, a result that the strength was higher than before was obtained. The method of measuring lateral load resistance is the same method as in actual use, with the flanges fixed and the filter suspended. The lateral load is applied by pulling the position 200 mm laterally from the lower end of the suspended filter. The load when the filter was broken was measured.

[Example 2]
Aggregates were deposited on the inside of the mold by the same slurry as in Example 1 above, using a female mold that poured the slurry into the inside of the bottomed cylindrical mold. Thereafter, the deposited cylindrical molded body with a bottom is removed from the mold, dried, fired at 1000 ° C., and part of the inner peripheral side is cut to obtain a candle-type ceramic filter having the shape shown in FIG. Manufactured.

  Specifically, the dimensions of the candle-type ceramic filter are as follows: the overall filter length L is 3000 mm, the filter outer diameter R1 is 150 mm, the filter inner diameter R2 is 110 mm, the wall thickness D of the filter body is 20 mm, and the width of the flange 11 While d was 45 mm, the thickness D1 of the root portion from the open end to 300 mm in the length direction of the filter was increased to 30 mm on the inner peripheral side.

  About the obtained candle type ceramic filter, when the lateral load resistance indicating the strength of the flange portion was measured in the same manner as in Example 1, it was about 12.1 kgf. Thus, each candle type ceramic filter of the present invention in which the width d of the flange portion 11 is longer (thicker) than that of the prior art and the thickness of the base portion is increased on the inner peripheral side is the conventional example 1 described above. It was found that this was a very high strength candle type ceramic filter having a lateral load resistance of about 2.5 times the lateral load resistance of 5 kgf of Sample 1.

  In the same manner as described above except that male molding is used, a candle-type ceramic filter is manufactured in which the width d of the flange portion 11 is increased and the thickness D2 of the root portion is increased on the outer peripheral side as shown in FIG. As a result, the lateral load resistance was 10.4 kgf, and it was found that the lateral load resistance was about 2.1 times the lateral load resistance 5 kgf of the sample 1 in Example 1 which is a conventional example.

1 Candle type ceramic filter 10 Filter body 11 Flange D Filter wall thickness L Filter total length d Flange width

Claims (3)

  A candle-shaped ceramic filter comprising a bottomed cylindrical filter body having one end opened and the other end sealed, and a flange portion integrally formed by projecting outward from one end of the filter body. A candle type ceramic filter characterized in that the width d of the flange portion in the length direction of the filter is in the range of 1.6 to 5.0 times the wall thickness of the filter body.   The thickness of the base part from the open end of the filter body to 300 mm in the length direction of the filter is thick on the inner peripheral side in the range of 1.1 to 3 times the wall thickness of the filter body. The candle-type ceramic filter according to claim 1, wherein   The thickness of the root portion from the open end of the filter body to 300 mm in the length direction of the filter is thicker on the outer peripheral side within a range of 1.1 to 3 times the wall thickness of the filter body. The candle-type ceramic filter according to claim 1.

Images