JPH0471562B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a backwashing device for a cylindrical filter.

[Prior art]

In recent years, porous cylindrical bodies made of ceramics, sintered metals, glass, synthetic resins, etc. have been formed, and such cylindrical bodies are used as cylindrical filters to remove impurities from gases and liquids.

[Problem to be solved by the invention]

By the way, filters generally become clogged after being used for a certain period of time, reducing their filtration function, so it is necessary to periodically backwash them to restore their filtration function. In this case, if the filter is large, a large amount of cleaning fluid is required when backwashing the filter, and the cleaning fluid supply device and discharge device become large.

Therefore, an object of the present invention is to effectively backwash a cylindrical filter using a small amount of cleaning fluid.

[Means to solve the problem]

The backwashing device for a cylindrical filter according to the present invention includes a cleaning body supply pipe arranged in parallel with the cylindrical filter in the inner hole of the cylindrical filter and having a number of openings spaced apart from each other in the longitudinal direction. , a valve disposed at each opening of the pipe to open and close the opening, and a valve mounted on the outer periphery of the pipe so as to be movable along its longitudinal direction and facing each other sequentially during movement. a slider that opens the opening and directs the cleaning fluid flowing out from the opening over a predetermined width in the longitudinal direction of the inner circumference of the filter; and a slider that moves the slider along the longitudinal direction of the pipe. The vehicle is characterized by being equipped with a means of transportation.

Pressure fluid can be used as the means for moving the slider, and in this case, a pipe for supplying the pressure fluid is placed inside the filter and faces one side of the slider. Further, a mechanical drive mechanism may be employed as the moving means, and the moving means may include a rod-shaped guide member having a male screw portion and rotatably supported in parallel with the pipe, and a portion of the slider. The guide member includes a cylindrical guided member that is fitted into the guide member, has a female screw portion in the inner hole, and is screwed into the guide member so as to be able to move forward and backward, and a driving means that rotationally drives the guide member.

[Action/effect of the invention]

In a backwashing device having such a configuration, the filter is installed in the filter when backwashing the filter, or is installed in the filter before the filter is used, and in this state, the cleaning fluid is supplied into the pipe, and The moving means is operated to move the slider along the outer periphery of the pipe in the longitudinal direction. Moving time of the slider The slider operates each valve arranged in the longitudinal direction of the pipe to sequentially open and close each opening of the pipe, and the cleaning fluid flowing out from the opening is spread over a predetermined width in the longitudinal direction on the inner periphery of the filter. It is directed all around the circumference and sequentially along the longitudinal direction. As a result,
The filter is intermittently sequentially backwashed in its longitudinal direction and finally cleaned, with the cleaning fluid being directed out of each zone to ensure that the entire filter is cleaned with less cleaning fluid.

In this case, if pressure fluid is used as a means for moving the slider, the backwashing device can be simplified in construction and downsized, and can be used even with relatively small diameter filters. Furthermore, if a mechanical drive mechanism is adopted as a means for moving the slider, the backwashing device will have a complicated configuration and become relatively large, but the movement of the slider will be accurately controlled and backwashing will be extremely efficient. I can do it.

〔Example〕

The present invention will be explained below based on the drawings.
The figure shows a filtration device incorporating a backwashing device according to a first embodiment of the present invention.

The filtration device 10 separates and removes various types of dust, soot, etc. mixed in high-temperature combustion gas and dry exhaust gas, and a ceramic cylindrical filter 12 is installed upright within the device body 11. The main body 11 includes a cylindrical body 11a and a bottom plate 1 fixed to the lower end of the cylindrical body 11a.
1b and an upper plate 111c fixed to the upper end, the lower end of the filter 12 is hermetically bolted to the bottom plate 11b at a flange 12a fixed to its outer periphery. The upper end of the filter 12 is hermetically bolted to a disk-shaped retainer 13 at a flange 12b fixed to its outer periphery, and the retainer 13 is fitted into the cylindrical body 11a below the upper plate 11c. It is elastically supported by a plurality of compression springs 14a and 14b interposed between it and the upper plate 11c. As a result, the filter 12
It is located concentrically with the cylindrical body 11a within the cylindrical body 1, and is erected in a state that allows thermal expansion and contraction in the longitudinal direction. In the container body 11, a first inlet boat 15a and a first
An outlet port 16a is provided, a second inlet port 15b is provided on the bottom plate 11b, and a second outlet port 16b is provided on the retainer 13.

The backwashing device 20 includes a pipe 21 for supplying cleaning fluid,
A large number of check valves 22 arranged on the pipe 21
A slider 23 is also provided on the outer periphery of the pipe 21 so as to be slidable in the vertical direction. pipe 21
A through hole 11d provided in the bottom plate 11b of the container body 11
It passes through a through hole 13a provided in the retainer 13, and is fixed to a cap 24a bolted to the lower surface of the bottom plate 11b, and is supported by a cap 24b bolted to the upper surface of the retainer 13 so as to be expandable and retractable in the vertical direction. has been done. Also, pipe 21
upper and lower cylindrical stoppers 25 fitted into both ends of the
a, 25b are each through hole 11 at each outward flange portion.
d, 13a, and each stopper 2
The caps protrude into the filter 12 by being urged inward by compression springs 26a and 26b interposed between the caps 5a and 25b and the respective caps 24a and 24b. The pipe 21 is provided with a large number of openings 21a at predetermined intervals in the vertical direction, and each opening 21a is provided with a check valve 22, as shown in FIGS. 2 and 3. A third inlet port 15c faces the lower end of the pipe 21.

The check valve 22 includes a valve body 22a and a valve body 22.
The valve body 22a is screwed onto the assembly nut 22c, which is made up of a valve body 22c and an assembly nut 22c, and which is fixed to the opening 21a of the pipe 21. The valve body 22a has a small diameter inner hole 22a ₁ and a large diameter inner hole 22a ₂ .
2a ₁ opens to the outside of the pipe 21 at the outer end and communicates with the large diameter inner hole 22a ₂ at the inner end, and is closed at the inner end of the large diameter inner hole 22a ₂ and has a through hole on the side. 22
It communicates with the inside of the pipe 21 at _a3 . Valve body 2
2b has a T-shape, and its large diameter portion 22b ₂ is incorporated into the large diameter inner hole 22a ₂ so as to be slidable in the inner and outer directions, and the small diameter portion 22b ₁ is inserted into the small diameter inner hole 22a ₁ at a predetermined circumferential interval. It is maintained and penetrated. In such a check valve 22, when pressure is applied inside the pipe 21, the valve body 22b slides outward to close the small diameter inner hole _22a1 , and the outer end of the small diameter portion _22b1 touches the outer periphery of the pipe 21. slightly protruding.

As shown in FIGS. 1 and 3, the slider 23 is formed by integrally forming a pair of outward flange portions 23b and 23c at both upper and lower ends of a cylindrical portion 23a. through hole 23a ₁ ,
23a ₂ is formed. Both through holes 23a ₁ , 23a ₂
The vertical interval is the small diameter inner hole 22 of the check valve 22.
an annular recess 23d having approximately the same diameter as a ₁ and having outer ends formed by both flanges 23b and 23c;
It is open to The tips of each flange portion 23b, 23c face near the inner periphery of the filter 12.

The filtration device 10 is used with the backwashing device 20 installed, but when using it, the second,
Third inlet ports 15b, 15c and first
The outlet port 16a is closed, and the exhaust gas containing dust, soot, etc. is transferred to the first inlet port 15.
It is supplied into the container main body 11 from a. The supplied exhaust gas passes through the filter 12 as shown by arrow A, reaches the inside thereof, and enters the second outlet port 16.
It is released into the atmosphere through b. During this time, the exhaust gas is separated from dust, soot, etc. by the filter 12 and released as clean gas, and the slider 23 descends under its own weight and is received by the stopper 25b.

In the filter device 10, the filter 12 is cleaned using a backflow device 20. Filter 1
For backwashing in step 2, the first inlet port 15
a and the second outlet port 16b, and the second and third inlet ports 15
b, 15c and the first outlet port 16a are opened, and compressed air for cleaning is passed through the third inlet port 15c as shown by arrow B to the pipe 21.
The compressed air for moving the slider 23 is supplied to the second inlet port 1 as shown by arrow C.
5b and into the filter 12. The compressed air for cleaning is controlled to a pressure sufficient to pass through the filter 12 and remove dust etc. adhering to the outer periphery, and the compressed air for movement is controlled to a pressure suitable for raising it at a predetermined speed by the slider 23. is controlled by.

Initially, the inside of the pipe 21 is sealed, but as the slider 23 rises, the slider 23 operates each check valve 22 to selectively open them.
The compressed air in the pipe 21 is locally and sequentially directed toward the inner periphery of the filter 12 as shown by arrow B. That is, when the slider 23 starts to rise, the slider 23 pushes the valve body 22b of the opposing check valve 22 inward to open the check valve 22, as shown in FIG. Therefore, the compressed air in the pipe 21 flows out into the annular recess 23d of the slider 23 through the through holes 23a ₁ and 23a ₂ , and is ejected to the inner circumference of the filter 12 facing the opening of the recess 23d. It passes through. As a result, the compressed air permeable portion of the filter 12 is cleaned, and the cleaned portion is sequentially expanded upward as the sweeper slider 23 rises. Therefore, the compressed air passes through each predetermined area sequentially and is not wasted, so that the entire filter 12 can be reliably cleaned with a small amount of compressed air. Dust and the like released from the filter 12 are discharged from the first outlet port 16a to a predetermined location together with the air that has passed through the filter 12. Note that when the supply of compressed air from the second inlet port 15b is stopped at the end of the backwashing operation, the slider 23 descends due to its own weight and returns to its original position.

In this embodiment, various known check valves are used, and for example, a check valve 27 using a ball 27a and a compression spring 27b shown in FIG. 4 is also suitable. Further, by making the cross-sectional shapes of the inner hole of the slider 23 and the outer periphery of the pipe 21 into a rectangular shape or the like to prevent rotation, each through hole of the slider 23 and the opening of the pipe 21 can be accurately aligned.

FIG. 5 shows a filtration device 30 incorporating a backwashing device according to a second embodiment of the present invention, and in this backwashing device 40, a slider can be moved up and down by a mechanical drive mechanism. It is becoming. The filtration device 30 has a filter 32 at the top inside a cylindrical container body 31.
The upper end opening of the filter 32 is covered with a cylindrical cap 33. In the filtration device 30, the container body 3
A first inlet port 31a is provided at the lower side of the port 1, and a first outlet port 31a is provided at the lower end.
1b, and a second outlet port 33a on the side of the cap 33. The exhaust gas to be treated is supplied from the first inlet port 31a to the main body 31, passes through the filter 32, and enters the second outlet port 33a. It is discharged from the outlet port 33a. In this case, the first outlet port 31b is closed.

The backwashing device 40 includes a pipe 41 and a check valve 4.
2 and a slider 43, as well as an electric motor 44, a guide rod 45, and a guide bush 46. The pipe 41 and check valve 42 are formed similarly to the pipe 21 and check valve 22 of the first embodiment, and are supported by the top 33b of the cap 33 and a support plate 47a disposed at the bottom of the filter 32. It extends vertically inside. A second inlet port 41a is provided at the upper end of this pipe 41.
is provided, and a stopper 47b is fixed to the upper outer periphery of the stopper 47b. Note that the support plate 47a also functions as a downward stopper for the slider 43. The slider 43 has two through holes 43a ₁ and 43a ₂ in its cylindrical portion 43a, and the first through hole 43a ₁
is inserted onto the pipe 41 at the second through hole 43a ₂
A guide bush 46 is fitted into the. The inner periphery of the guide bushing 46 has a female thread.
The entire outer periphery of the guide rod 45 has a male thread, and is connected to the output shaft of the motor 44 so that it can rotate integrally with the output shaft. The guide rod 45 rotatably passes through the top 33b of the cap 33, and passes through the guide bush 46 fitted to the slider 43 in a screwed state, and extends through the top 33b.
It is supported by a motor 44 assembled to.

In the backwashing device 40 having such a configuration, compressed air for cleaning is supplied into the pipe 41 from the second inlet port 41a, and each check valve 42 is sequentially opened and closed by vertical movement of the slider 43.
The filter 42 is backwashed and cleaned in the same way as the backwashing device 20 of the embodiment. Thus, during backwashing, the motor 44 is driven. This allows the guide rod 4
5 rotates forward and reverse, for example, the guide rod 45
When the slider 43 rotates in the normal direction, the slider 43 moves upward on the outer periphery of the pipe 41 and the guide rod 45, and when the guide rod 45 rotates in the reverse direction, the slider 43 moves up the outer periphery of the pipe 41 and the guide rod 45.
1. Move down the outer circumference of 45.

In each embodiment, an example of a backwash device incorporated into a filtration device is shown, but the backwash device of the present invention can also be used as a backwash device for backwashing a filter removed from a filtration device. . Further, in each embodiment, backwashing can be performed by operating the backwashing device while the filtration device is in operation.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a filtration device incorporating a backwashing device according to a first embodiment of the present invention, Fig. 2 is a longitudinal sectional view of a check valve constituting the backwashing device, and Fig. 3 is a longitudinal sectional view of the same device. 4 is a vertical sectional view showing a modified example of the check valve, and FIG. 5 is a longitudinal sectional view of a filtration device incorporating a backwashing device according to a second embodiment of the present invention. FIG. Explanation of symbols, 10, 30...Filtering device, 11,
31... device body, 12, 32... filter, 2
0,40...Backwash device, 21,41...Pipe,
22,42...Check valve, 23,43...
Slider, 44...motor, 45...guide rod, 46...guide bush.

Claims (1)

[Claims] 1. A pipe for supplying cleaning fluid that is arranged in parallel with the filter in the inner hole of the cylindrical filter and has a number of openings spaced apart from each other in the longitudinal direction; A valve that opens and closes the opening, and a valve that is movably attached to the outer periphery of the pipe along its longitudinal direction, and when moving, the opposing valves are sequentially operated to open the opening and flow out from the opening. backwashing of a cylindrical filter comprising: a slider for directing cleaning fluid to a predetermined longitudinal width of the inner periphery of the filter; and a moving means for moving the slider along the longitudinal direction of the pipe; Device.