JPH08266839A - Gas filter - Google Patents

Abstract

PURPOSE: To prevent the occurrence of crack in filter elements, to make constitution simpler and maintenance easier and to reduce initial and running costs. CONSTITUTION: The filter elements 8 are individually dropped into the plural dropping holes formed in an upper top plate 21 and housing parts 9 are pressed to this upper top plate 21. As a result, the plural filter elements 8 are hung down apart prescribed intervals from the upper top plate 21. Then, the weights of the filter elements 8 are dispersed over the entire part of the housing parts 9. A moving means moves one piece of injection nozzle of a backward washing means 22 to the desired position between the plural filter elements 8 and 8. As a result, backflow air is injected to the plural filter elements 8 by one piece of the injection nozzle, by which the powder and granular materials sticking to the surfaces of the filter elements 8 are peeled.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a gas filter,
In particular, the present invention relates to a gas filter in which powder particles contained in gas are adhered to and accumulated on a plurality of filter elements to be collected, and powder particles adhered to and accumulated on a plurality of filter elements are removed by backwashing.

[0002]

2. Description of the Related Art Conventionally, gas filters have been used in various fields. Among the many gas filters, many are used for the purpose of preventing pollution such as filtering soot and so on to produce clean gas in various production plants, and also for recovering powdered products in gas. In many cases, it is also used for filtering and collecting powder-containing gas. In such a gas filter, various filter bodies are used according to the purpose of use, but as the filter body, which is suitable for use in high temperature gas, it is made of sintered plastic. Alternatively, there is a filter element made of ceramic.

FIG. 6 shows the structure of a gas filter 1 using a conventional filter element made of plastic, for example. This gas filter 1 has a substantially rectangular closed casing 2, the inside of which is divided into a lower gas chamber 4 and an upper separated gas chamber 5 by an upper top plate 3 which is a partition wall. A powder-containing gas supply port 6 that communicates with the lower gas chamber 4 is provided on the middle side. Also,
A separation gas exhaust port 7 communicating with the separation gas chamber 5 is provided in the upper portion of the casing 2. Further, hollow flat filter elements 8, 8 ... Are attached to the lower surface of the upper top plate 3 at predetermined intervals.

As shown in FIG. 7, the filter element 8 has a large diameter portion 9 formed at the upper end, and the large diameter portion 9 is the frame 1.
It is formed in a swelled shape so as to accommodate 0. Both ends of the frame 10 housed in the large-diameter portion 9 are attached to the upper top plate 3 integrally with the large-diameter portion 9 via tightening bolts 11. As a result, the filter element 8
Are hung on the top plate 3. A packing 12 is interposed between the upper top plate 3 and the frame 10.

As shown in FIG. 6, the gas containing the granular material supplied from the gas supply port 6 into the gas chamber 4 of the casing 2 is hollow and has a filter element 8 having a bellows-like or corrugated cross section, for example. From the outside to the inside through the filter body of the element. At this time, the particles in the gas are attached and accumulated by the filter element 8, so that the particles are separated from the gas. The gas flowing into the inside of the filter element 8 enters the separation gas chamber 5 in the upper part of the casing 2 through the gas passage of the frame 10 and the gas passage of the upper top plate 3 communicating therewith, and is guided to a predetermined place from its exhaust port 7. Get burned.

In this way, by separating the powdery particles contained in the gas from the gas by the filter element 8, the powdery particles are attached and deposited on the surface of the filter element 8. Then, when powder particles are deposited and accumulated on the surface of the filter element 8, the gas flow path of the filter element 8 is closed and the pressure loss increases. For this reason, the filter elements 8, 8 ... Are sequentially backwashed at regular intervals to remove the powder particles that have adhered to and accumulated on the surface of the filter elements 8, 8. That is, as shown in FIG. 6, the backwash injection pipes 13, 13, ... Are arranged above the upper top plate 3 (secondary side), and the injection pipes 13, 13 ,.
Are communicated with the air tank 15 via backwash valves 14, 14, etc., respectively. And the backwash valves 14, 14 ...
By controlling the timer of ...
Air in the air tank 15 is sequentially ejected from the ejection nozzles 3, 13 ... At regular intervals. As a result, the air that has been successively ejected at a constant interval flows backward from the inside of the filter elements 8, 8 ... To the outside of the filter elements 8, 8. Be dropped.

As described above, the gas supplied from the gas supply port 6 into the casing 2 is subjected to pressure loss by reversing the air to separate the powder or granular material layer so as to separate from the filter element. Is maintained at a constant value, and is exhausted from the exhaust port 7 through the filter elements 8, 8.

[0008]

As described above, in the conventional gas filter 1, the frame 10 is housed in the large diameter portion 9 of the filter element 8, and both ends of the frame 10 and both ends of the large diameter portion 9 are arranged. The filter element 8 is suspended from the upper top plate 3 by being integrally attached to the upper top plate 3 via a tightening bolt 11. However, a material obtained by sintering a predetermined material such as plastic is used for the filter element 8, and a relatively large stress is generated by the tightening bolt 11 due to its own weight, the weight of the adhered powder and the reaction force of the packing. Clamped filter element 8
Since it occurs at both ends of the large diameter portion 9, there is a problem that cracks or the like occur in the large diameter portion 9 of the filter element 8.
If the filter element 8 is used for a long period of time in a state where the large-diameter portion 9 of the filter element 8 is still cracked, the crack becomes large and the particulate matter leaks from the crack depending on the type of gas to be handled and the temperature of the gas. Occurs.

Further, in the conventional gas filter 1, injection pipes 13, 13 ... For backwashing, backwash valves 14, 14 ..., And the like are arranged corresponding to the number of filter elements 8, 8 ... Therefore, a large number of injection pipes 13, 13 ... and backwash valves 14, 1
4 ... are arranged in the separation gas chamber 5. Therefore,
There are problems that the structure inside the separation gas chamber 5 becomes complicated and that maintenance becomes difficult. In addition, the backwash valve 14
Has a consumable part such as a diaphragm valve, which causes a problem of high initial cost and running cost. Such a problem becomes more serious as the gas filter 1 becomes larger.

Therefore, the object of the present invention is to solve the problems of the above-mentioned prior art, to prevent the occurrence of cracks in the filter element, to simplify the structure and to facilitate maintenance, and to further reduce the initial cost. Another object of the present invention is to provide a gas filter that can reduce the running cost.

[0011]

In order to achieve the above object, the present invention divides the inside of a casing into a primary side gas chamber and a secondary side gas chamber by a partition wall, and a plurality of gas chambers are provided through the partition wall. Holding the filter element in the gas chamber, and introducing the gas introduced into the gas chamber on the primary side into the gas on the secondary side through the plurality of filter elements, thereby reducing the amount of gas contained in the gas. The filter body was adhered and deposited on the plurality of filter elements, and the air was back-flow-injected from the injection nozzle of the backwash means provided in the gas chamber on the secondary side to adhere and deposit on the plurality of filter elements. A gas filter for removing the object to be filtered, wherein a plurality of drop holes are formed in the partition wall, and the plurality of filter elements are individually provided in the plurality of drop holes from the secondary side gas chamber side. And a large diameter portion projecting from the upper ends of the plurality of filter elements is brought into contact with the partition wall to suspend the plurality of filter elements in the gas chamber and move the injection nozzle of the backwash means. It is characterized in that it is connected to the means and the injection nozzle is moved by the moving means to a position where the air is backflow-injected to the plurality of filter elements.

[0012]

[Operation] According to the present invention, a plurality of drop holes are formed in the partition wall, and a plurality of filter elements are individually dropped into the plurality of drop holes from the separation gas chamber side, and the upper ends of the plurality of filter elements are dropped. The large-diameter portion that overhangs the section is brought into contact with the partition wall. As a result, the plurality of filter elements are suspended on the partition wall at a predetermined interval. In this case, the weight of the filter element is dispersed in the large diameter portion. Further, the jetting nozzle of the backwashing means is moved to a position where the air is backflow jetted to the plurality of filter elements by the moving means provided above (secondary side) the plurality of filter elements. Therefore, the backwashing means reversely jets air to a plurality of filter elements with one jet nozzle to separate and drop filtered substances such as powder particles or the like adhered to and deposited on the surface of the filter element.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gas filter according to the present invention will be described below with reference to the drawings. 1 to 5, the same members as those of the conventional technique are designated by the same reference numerals and the description thereof will be omitted. As shown in FIG. 1, the casing 2 of the gas filter 20 is divided into a lower gas chamber 4 and an upper separated gas chamber 5 by an upper top plate 21 which is a partition wall.
A plurality of recessed holes (not shown) are formed in the upper top plate 21 at regular intervals. The filter elements 8, 8 ... Are fitted into the plurality of drop holes while being dropped from the separation gas chamber 5 side to the gas chamber 4 side.
As a result, the filter elements 8, 8 ... Are suspended from the upper top plate 21.

That is, the filter element 8 has a large diameter portion 9 formed at the upper end, and the large diameter portion 9 is formed in a swelled shape so as to accommodate the frame 10. Therefore, by inserting the filter element 8 into the gas chamber 4 side through the drop hole of the upper top plate 21,
The large diameter portion 9 contacts the upper top plate 21. As a result, the filter elements 8, 8 ... Are hung from the gas chamber 4 side and suspended from the upper top plate 21 at regular intervals (see FIGS. 1 and 2). In this case, the large-diameter portion 9 and the frame 10 housed in the large-diameter portion 9 are fixed to the upper top plate 21 by fixing means (not shown).

As shown in FIG. 3, the filter element 8 is formed into a hollow shape by sintering plastic, for example, and has a wavy cross section. As a result, the filtration surface of the filter element 8 becomes wider. Further, the gas filter 20 includes a backwashing means 22 and a moving means 23, and the backwashing means 22 has an injection pipe 13, a backwash valve 14, and an air tank 15. As shown in FIG. 4, the injection pipe 13 is formed in a tubular shape having a rectangular cross section, and injection nozzles 24, 24 ... (See FIG. 5) are formed at regular intervals on both sides of the lower surface. Both ends of the injection pipe 13 are connected to a moving means 23, which will be described later, and are arranged above the large diameter portion 9 of the filter element 8 (secondary side) in parallel with the large diameter portion 9. Then, as shown in FIG. 5, when the injection pipe 13 is located between the pair of large diameter portions 9, 9, the injection nozzles 24, 24 on the left side of the injection pipe 13 are positioned above the left large diameter portion 9. Then
The injection nozzles 24, 24 on the right side of the injection pipe 13 are located above the large diameter portion 9 on the right side.

As shown in FIG. 4, one end of a hose 27 is connected to the center of the injection pipe 13 via a communication pipe 26, and the backwash valve 14 shown in FIG. 1 is connected to the other end of the hose 27. There is. Further, the backwash valve 14 is connected to the air tank 1 via the pipe 28.
It is connected to 5. The backwash valve 14 has a solenoid valve and a diaphragm valve, and when the solenoid valve is energized, the air in the diaphragm chamber flows to the atmosphere via the solenoid valve. At this moment, the pressure in the diaphragm chamber becomes lower than the pressure in the air tank 15, the diaphragm valve rises, and the compressed air flows from the air tank 15 to the injection nozzles 24.

As a result, compressed air is instantaneously jetted from the jet nozzles 24, 24 ... And the jetted compressed air is backflow jetted into the filter element 8 through the opening holes 10a, 10a. . The filter element 8 is formed by the compressed air and the entrained air which are back-flow injected.
The particles that have adhered to and accumulated on the surface of the are separated. Further, the backwash valve 14 stops the air tank 1 when the solenoid valve is de-energized.
The compressed air in 5 is supplied to the diaphragm chamber so that the pressure in the air tank 15 and the pressure in the diaphragm chamber become the same. As a result, the diaphragm valve is closed by the urging force of the spring, and the flow of compressed air stops. Further, as shown in FIG. 4, the moving means 23 has, for example, a pair of threaded beams 30, 30, and the threaded beams 30, 30 are respectively filter elements 8, 8.
It is arranged in parallel on both sides above. Screw beam 30,
Moving nuts 31 and 31 are respectively screw-coupled to 30, and the moving nuts 31 and 31 are integrally connected via the above-described injection pipe 13.

The screw beams 30 and 30 are connected to a motor (not shown) so that a rotational force can be transmitted, and the screw beams 30 and 30 are rotated by the drive of the motor, whereby the injection pipe 13 is moved to the moving nuts 31 and 31. Together with it, it moves in the direction of the arrow along the screw beams 30, 30. The moving means 23 has a detecting means (not shown) such as a limit switch. This detecting means is arranged at a predetermined position and detects the injection pipe 13 that has moved to the predetermined position. Then, the motor is controlled based on the detection signal output from the detection means, and the injection pipe 13 is positioned at a predetermined position.

Further, by providing the moving means 23, one injection pipe 13 can be moved and positioned between the filter elements 8 and 8, so that the filter elements 8 and 8 can be dropped on the upper top plate 21. The injection pipe 13 can be retracted to a position where it does not interfere with the work when the injection pipe 13 is fitted into the gas chamber 4 through the insertion hole.
Next, the operation of the gas filter according to the present invention configured as described above will be described. First, the motor of the moving means 23 is driven to rotate the screw beams 30, 30. As a result, the injection pipe 13 together with the moving nuts 31 and 31 are screw beams 30 and 30.
Along the direction of the arrow (see FIG. 4). Then, when the injection pipe 13 moves to a predetermined position (P1 position in FIG. 5) between the filter elements 8 and 8, the detection means detects the injection pipe 13 and outputs a detection signal. As a result, the motor stops and the injection pipe 13 stops at the P1 position.

Next, the solenoid valve of the backwash valve 14 is energized to allow the air in the diaphragm chamber to flow out to the atmosphere via the solenoid valve. As a result, the pressure in the diaphragm chamber becomes lower than the pressure in the air tank 15, the diaphragm valve rises, and the compressed air in the air tank 15 flows to the injection nozzles 24, 24 .... Then, the compressed air that has flowed to the injection nozzles 24, 24 ... Is instantaneously backflow-injected into the filter element 8 from the injection nozzles 24, 24. The back-flowing air and the entrained air separate the powder particles that have adhered to and accumulated on the surface of the filter element 8.

Next, the energization of the solenoid valve of the backwash valve 14 is stopped, the compressed air in the air tank is supplied to the diaphragm chamber, and the pressure in the air tank 15 becomes equal to that in the diaphragm chamber. Therefore, the diaphragm valve is closed by the urging force of the spring and the flow of compressed air is stopped. Subsequently, the motor of the moving means 23 is driven again to rotate the threaded beams 30, 30. Then, the injection pipe 13 is moved to a predetermined position in the right direction (see FIG.
To move to P2 position). When the injection pipe 13 moves to the P2 position, the detection means detects the injection pipe 13 and outputs a detection signal. As a result, the motor stops and the injection pipe 13
Stops at P2 position. Hereinafter, the above-described steps are sequentially repeated to backwash the powder particles deposited and deposited on the filter elements 8, 8 ...

In this way, the gas supplied from the gas supply port 6 into the casing 2 is maintained at a constant pressure loss by sequentially backwashing the filter elements 8, 8 ... At regular intervals. In this state, the gas is exhausted from the exhaust port 7 through the filter elements 8, 8. In the above embodiment, the case where the solenoid valve is used as the backwash valve 14 of the backwash means 22 is described, but the present invention is not limited to this, and the same applies even if other means such as an air rotary cycle controller is used instead of the solenoid valve. The effect of can be obtained. Further, in the above-described embodiment, the case where the screw beams 30 and 30 are used for the moving means 23 and the screw beams 30 and 30 are rotated by the motor to move the injection pipe 13 has been described, but the present invention is not limited to this. It is also possible to move the injection pipe 13 by using other moving means such as a cylinder or a cylinder.

[0023]

As is apparent from the above description, according to the gas filter of the present invention, the filter element is individually dropped into the plurality of drop holes formed in the partition wall so that the large-diameter portion is attached to the partition wall. Abut. As a result, the plurality of filter elements are suspended on the partition wall at a predetermined interval. Therefore, the self-weight of the filter element is dispersed over the large diameter portion, so that the filter element can be prevented from cracking. Further, the moving means moves one jet nozzle of the backwash means to a position where the air is backflow jetted to the plurality of filter elements, and the jet nozzle jets backflow air to the plurality of filter elements to jet the air to the surface of the filter element. The adhered and accumulated powder and granules are separated from the element. As a result, the configuration can be simplified, maintenance can be facilitated, and the initial cost and running cost can be reduced. Further, since one injection pipe can be moved by the moving means, when the plurality of filter elements are dropped from the drop hole of the partition wall to the gas chamber side, the injection pipe can be retracted to a position that does not interfere with the work. it can. Therefore, according to the present invention, it is possible to provide a gas filter having good workability during assembly and maintenance.

[Brief description of drawings]

1 is a cross-sectional view of a gas filter according to the present invention.

FIG. 2 is a side view of a filter element used in a gas filter according to the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an enlarged perspective view showing a main part of a gas filter according to the present invention.

FIG. 5 is an explanatory view explaining the operation of the gas filter according to the present invention.

FIG. 6 is a sectional view of a conventional gas filter.

FIG. 7 is a side view of a filter element used in a conventional gas filter.

[Explanation of symbols]

 2 Casing 4 Gas chamber 5 Separation gas chamber 8 Filter element 9 Large diameter part 20 Gas filter 21 Upper top plate (partition wall) 22 Backwashing means 23 Moving means 24 Injection nozzle

Claims (1)

[Claims] 1. A casing is divided into a primary-side gas chamber and a secondary-side gas chamber by a partition wall, and a plurality of filter elements are held in the gas chamber via the partition wall, and the primary-side gas is retained. By introducing the gas introduced into the chamber through the plurality of filter elements into the gas on the secondary side, the object to be filtered contained in the gas is attached to and deposited on the plurality of filter elements, and A partition wall, which is a gas filter that removes the object to be filtered adhered to and deposited on the plurality of filter elements by injecting air backward from an injection nozzle of a backwash means provided in a gas chamber on the secondary side, the partition wall A plurality of drop holes, and the plurality of filter elements are individually dropped into the plurality of drop holes from the gas chamber side of the secondary side, and the upper ends of the plurality of filter elements are formed. A plurality of filter elements are suspended in the gas chamber by abutting a large-diameter portion that overhangs the partition wall, the injection nozzle of the backwash means is connected to a moving means, and the injection nozzle is the moving means. The gas filter is configured so as to move to a position at which air is backflow-injected into the plurality of filter elements.