JP2016215184A - Filter cleaning device and filter cleaning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high performance and compact filter cleaning device and a filter cleaning method for pushing out foreign matter collected to the filter material inside, by effectively cleaning up to the filter material inside from a surface of a filter, by including fine foreign matter of sub μm stuck to a fiber surface.SOLUTION: A filter (2) for collecting foreign matter to a filter material of entangling fiber in a mesh shape is carried, and a cleaning liquid (6) is injected into the filter from above this carried filter (2), and the foreign matter is separated from the filter by vibrating the filter by a vibrator (10) from below the filter in an injection position of the cleaning liquid, and high pressure gas (8) is injected from above the carried filter on the downstream side of the injection position of the cleaning liquid, and the foreign matter separated from the filter is pushed out to an external part of the filter by vibrating the filter by a separate vibrator from below the filter in an injection position of the high pressure gas.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a filter cleaning device and a filter cleaning method, and more particularly to a filter cleaning device provided in an air conditioner and the like, and a filter cleaning method using the filter cleaning device, for example.

  For example, the air intake of a building air conditioner or the like is equipped with a net-like filter having a frame formed on the periphery, and foreign matter such as dust in the air sucked by the air conditioner or the like is collected and air is collected. Is generally filtered. In such a filter, foreign matter such as dust adheres to the filter surface due to use and decreases the filter's ability to filter air, so the filter is removed from the air intake at regular intervals and replaced or washed to remove foreign matter. It is being removed.

  The mesh filter is washed by, for example, water washing with a high-pressure air jetter, suction with a vacuum, sifting (striking) using a vibrator, scraping with a brush, or a combination thereof. These cleaning operations are performed manually or semi-automatically.

  Further, as a medium-performance or high-performance air-conditioning filter, an air-conditioning filter using a filter medium in which fibers are entangled in a mesh shape is employed. Here, the medium-performance or high-performance air-conditioning filter means a particle size of 0. 0 as defined in JIS standard B 9908: 2011 “Test method for performance of ventilation air filter unit / ventilation electric dust collector”. The filter unit has an initial collection rate of less than 99% for 4 μm particles.

  The air-conditioning filter using this filter medium also collects fine dust and oil components in the air after attaching a mesh filter by a pre-filter to collect dust and the like. The filter medium is made of a porous nonwoven fabric mainly composed of chemical fibers, and collects foreign matters such as fine dust and oil components in the air by the network structure. Note that fine dust, oil components, and the like in the air collected by the air conditioning filter are collectively referred to as “foreign substances”.

  Conventionally, this air-conditioning filter has been disposable because of the difficulty in cleaning the filter medium. However, due to the growing interest in environmental problems, attempts to recycle and reuse the filter have been studied. An automated cleaning method for recovering and cleaning the air conditioning filter has been proposed. This automatic cleaning of the air-conditioning filter is mainly performed by an ultrasonic cleaning system using an ultrasonic cleaning effect. A cleaning system using supercritical carbon dioxide suitable for a gas adsorption filter such as a chemical filter has also been proposed.

  The ultrasonic cleaning system used for cleaning medium-performance or high-performance air-conditioning filters using a filter medium in which fibers are entangled in a mesh form requires large equipment and consumes high power, which is contrary to energy saving. Consideration for the environment becomes a problem. Also, the supercritical carbon dioxide cleaning system requires a large-scale device, special equipment is necessary because of the special equipment management, continuous operation is difficult, or one-time cleaning filter There are problems such as limited number of sheets and inferior productivity.

As a technique for efficiently cleaning a medium-performance or high-performance filter using a filter medium in which such fibers are entangled in a mesh shape, the present applicant has applied a cleaning solution spraying device and a filter cleaning device using a cleaning liquid spray and high-pressure gas. A method was developed (see, for example, Patent Document 1).
According to this technique, the cleaning liquid is infiltrated into the meshed fibers, the filter medium is immersed in the cleaning liquid to remove foreign substances, and the exfoliated foreign substances are extruded with a high-pressure gas so that the fibers, the surface of the filter medium, or the fibers are removed. It became possible to efficiently remove foreign matters collected inside the filter medium entangled in a mesh shape.

On the other hand, in recent years, health hazards of particulate matter such as PM2.5 have been reported, and even in medium-performance or high-performance air conditioning filters, collection of minute foreign substances with a diameter of several to sub-μm is required. Yes. The fiber diameter of the filter medium used in the medium-performance or high-performance air conditioning filter is about several μm to 20 μm, and the mesh size of these fibers is also about several μm to 10 μm. Foreign matter with a diameter of 1 μm to several μm is collected by the fiber mesh, but micro foreign matter with a diameter of sub-μm passes through the fiber mesh, and electrostatic force and physical force acting between the sub-μm fine foreign matter and the fiber. It is collected by the filter by adhering to the fiber surface by simple adsorption.
Sub-μm minute foreign matter adhering to the fiber surface of the medium performance or high performance air conditioning filter is 1/10 to 1/100 the size of the fiber diameter of the medium performance or high performance air conditioning filter. .

When cleaning such a medium-performance or high-performance air-conditioning filter in which fine foreign substances adhere to the fiber surface by the cleaning liquid jet and high-pressure gas spray disclosed in the above-mentioned Patent Document 1, Since the gap between the contacted portions is less than or equal to sub-μm, it becomes difficult for the cleaning liquid to enter, and separation of minute foreign matters by the cleaning liquid does not occur.
Further, since the gas flow by the high-pressure gas becomes a steady flow on the stationary fiber, the flow of the airflow is slow near the outermost surface of the fiber (0.1 μm or less), and the force for pushing out the foreign matter is weakened. . For this reason, the cleaning effect of the sub-micrometer minute foreign matter adhering to the fiber surface of the medium performance or high performance air conditioning filter is lowered.

  In order to enhance the cleaning effect of foreign matter, as a technology to vibrate the object to be cleaned, a device that uses vibration at the time of gas injection, that is, a conveyor that conveys the object to be cleaned is vibrated to vibrate the object to be cleaned, and foreign matter caused by high pressure gas injection A device that enhances the removal effect (for example, see Patent Document 2) and a method that uses vibration when jetting cleaning liquid, that is, a plurality of rollers that are used to transport the cleaning object are simultaneously vibrated to vibrate the object to be cleaned, There has been proposed a method (for example, see Patent Document 3) of enhancing the foreign matter removal effect by cleaning liquid injection.

JP 2011-161358 A JP-A-60-137414 JP-A-3-19684

  However, even if the sub-μm minute foreign matter adhering to the fiber surface of the medium-performance or high-performance air-conditioning filter is cleaned using the techniques shown in Patent Document 2 and Patent Document 3 described above, it is compared with Patent Document 1. The cleaning effect does not increase. This is because the object to be cleaned is vibrated by the vibration technique disclosed in Patent Document 2 or Patent Document 3 by vibrating the transport system.

  When a medium-performance or high-performance air conditioning filter is vibrated by vibration applied to the transport system, the entire filter vibrates as a whole, so that the filter medium constituting the filter vibrates in the same manner as the filter. The fibers forming the filter medium also vibrate as a whole without changing the positional relationship between the fibers.

  When such vibration is performed, the sub-μm minute foreign matter adhering to the fiber surface and the cleaning liquid sprayed onto the fiber surface also have the same vibration as the fiber, so that the cleaning liquid intrudes into the contact portion between the fiber and the sub-μm minute foreign matter. Not promoted. In addition, the flow of the high-pressure gas injected into the filter also becomes a steady flow on the fiber surface because the filter vibrates as a whole, and the flow that pushes out the sub-μm minute foreign matter adhering to the fiber surface remains weak. .

  The present invention has been made to solve such a problem, and its purpose is to effectively wash the surface of the filter from the filter surface to the inside of the filter medium, including sub-μm minute foreign matter adhering to the fiber surface. It is an object to provide a high-performance and compact filter cleaning apparatus and filter cleaning method for extruding foreign matter collected in a filter.

  In order to achieve the above object, a filter cleaning apparatus according to the present invention includes a filter transport unit that transports a filter that collects foreign matter on a filter medium in which fibers are entangled in a mesh shape, and a filter transport unit from above the filter transport unit. An upper cleaning liquid spray nozzle that sprays cleaning liquid to separate the foreign matter from the filter, and the foreign matter that has been peeled from the fiber by spraying high-pressure gas from above the filter transport section on the downstream side in the transport direction of the upper cleaning liquid spray nozzle A high-pressure gas injection nozzle that pushes the filter out of the filter, and first and second vibrations that cause the filter to vibrate at positions of the filter transport unit that respectively oppose the injection positions of the upper cleaning liquid injection nozzle and the high-pressure gas injection nozzle And a vibrator for applying vibration to the first and second vibrating bodies.

  In order to achieve the above object, in the present invention, a filter that collects foreign matters is transported to a filter medium in which fibers are entangled in a mesh shape, and a cleaning liquid is sprayed onto the filter from above the transported filter. The filter is vibrated from below the filter by a vibrating body at a cleaning liquid injection position to separate the foreign matter from the filter, and high pressure gas is injected from above the conveyed filter downstream of the cleaning liquid injection position. In addition, there is provided a filter cleaning method in which the filter is vibrated from the lower side of the filter by another vibrating body at the high-pressure gas injection position and the foreign matter separated from the filter is pushed out of the filter.

  As described above, according to the filter cleaning device and the filter cleaning method according to the present invention, the filter is vibrated when the cleaning liquid is sprayed to vibrate the fibers of the filter medium in which the fibers are entangled in a mesh shape, and the surface of the fibers. The sub-μm minute foreign matter can be peeled from the fiber by reducing the adhesion of the sub-μm minute foreign matter by infiltrating the cleaning liquid into the interface portion where the sub-μm fine foreign matter adhered to the fiber contacts the fiber. Furthermore, by jetting the high-pressure gas while vibrating the filter downstream of the cleaning liquid jet position, turbulence is generated in the high-pressure gas flowing on the fiber surface, and the gas flow due to the high-pressure gas near the fiber surface is slowed down. It is possible to prevent and exfoliate the sub-μm minute foreign matter from the filter together with the cleaning liquid.

Since the vibrating body is installed opposite to each injection position, when the vibrating body vibrates, the filter is pressed against the vibrating body by the jet cleaning liquid and the jet high pressure gas at the same position. I can tell you the power.
Therefore, not only foreign matters having a diameter of 1 μm or more, but also sub-μm fine foreign matters adhering to the fiber surface can be effectively cleaned up to the inside of the filter medium, and high-performance and compact filter cleaning can be realized.

It is the side view which showed schematic structure of Embodiment 1 of the filter cleaning apparatus which concerns on this invention. It is front sectional drawing which shows the internal structure of a filter. It is the top view which showed schematic structure of Embodiment 1 of the filter cleaning apparatus which concerns on this invention. It is a side view for demonstrating the difference of the vibration which the vibration by a roller and the vibration by a diaphragm give to a filter, The figure (1) shows a prior art example, The figure (2) is a figure which shows this invention. It is the figure which showed partially the filter conveyance process at the time of adjusting the height position of a diaphragm using a height adjustment mechanism, The figure (1) shows the case where a height position is inappropriate, (2) is a figure which respectively shows the case where a height position is appropriate. It is the figure which showed the structure of the height adjustment mechanism using the coupling of a vibrating bar. It is a figure explaining the process in which the fiber which forms a filter medium changes with frequency. It is the graph which showed the experimental data which shows the cleaning effect by vibration. It is a side view which shows the structure of the principal part of Embodiment 2 of the filter cleaning apparatus which concerns on this invention.

  Hereinafter, a filter cleaning apparatus and a filter cleaning method according to the present invention will be described in detail with reference to the drawings. Although the filter cleaning apparatus will be mainly described, the filter cleaning method is also described in the filter cleaning apparatus at the same time.

Embodiment 1 FIG.
FIG. 1 shows one embodiment of a filter cleaning device 1. In this embodiment, the filter 2 is an air conditioning filter using a filter medium composed of a porous nonwoven fabric mainly composed of chemical fibers. Yes, it is a medium or high performance air conditioning filter. For example, the filter 2 is attached to an air intake of a building air conditioner or the like, and collects foreign matters such as dust contained in the sucked air and filters the air.

  Accordingly, since the filter 2 has a reduced ability to filter air due to adhesion of foreign matters such as dust, the filter 2 must be removed from the air intake at regular intervals and cleaned. The thickness of the filter 2 using this filter medium is in the range of about 10 mm to about 500 mm, and even fine dust and oil components in the air are collected by the network structure.

  FIG. 2 is a diagram showing the internal structure of the filter 2. Inside the filter 2, a filter medium 3 in which fibers are entangled in a mesh shape is folded into a pleat shape and attached inside the filter frame 4. By folding the filter medium 3 into a pleated shape, the surface area of the filter medium 3 installed on the filter 2 can be increased, the amount of foreign matter collected can be increased, and the use period can be extended. The fiber diameter used for the filter medium 3 varies depending on the type of the filter 2, but is several μm to 20 μm. Some filters 2 have the filter medium 3 bonded to the filter frame 4, and others have the filter medium 3 removable from the filter frame 4. In the filter cleaning apparatus 1, both the filter 2 with the filter medium 3 attached to the filter frame 4 and the filter medium 3 only removed from the filter frame 4 can be cleaned as the filter 2.

  A filter cleaning apparatus 1 shown in FIG. 1 includes a roller conveyor 5 as a filter transport unit that transfers a filter 2 and a plurality of cleaning liquid spray nozzles 7a that spray a cleaning liquid 6a onto the filter 2 on the transport surface of the roller conveyor 5 from above. A plurality of high-pressure gas injection nozzles 9 for injecting only the high-pressure gas 8 downstream of the cleaning liquid injection nozzle 7a, and the cleaning liquid injection nozzle 7a and the high-pressure gas injection nozzle 9 are respectively opposed to the filter 2 on the conveying surface of the roller conveyor 5. The vibrating plates 10a and 10b serving as the first and second vibrating bodies installed between the rollers of the roller conveyor 5 at the transport path position, the vibrating rod 12a for connecting the vibrating plate 10a and the vibrator 11a, and the vibrating plate 10b And a vibrating rod 12b connecting the vibrator 11b. In the illustrated example, each of the cleaning liquid injection nozzle 7a and the high-pressure gas injection nozzle 9 is represented by a single representative.

A cleaning liquid spray nozzle 7b for spraying the cleaning liquid 6b is also provided below the roller conveyor 5. However, these are not essential, and it is sufficient if there is a cleaning liquid spray nozzle 7a for spraying the cleaning liquid 6a.
Hereinafter, reference numerals 6a and 6b are collectively referred to as reference numeral 6, reference numerals 7a and 7b are collectively referred to as reference numeral 7, reference numerals 10a and 10b are collectively referred to as reference numeral 10, reference numerals 11a and 11b are collectively referred to as reference numeral 11, and reference numeral 12a. , 12b may be collectively referred to by reference numeral 12.

  Further, in FIG. 3 when the roller conveyor 5 is viewed from above in the filter cleaning apparatus 1, the cleaning liquid spray nozzles 7 are a cleaning liquid spray nozzle group arranged in a row in a direction perpendicular to the filter transport direction indicated by the arrow. 13 is formed. The high-pressure gas injection nozzles 9 also form a high-pressure gas injection nozzle group 14 arranged in a row in a direction perpendicular to the filter transport direction. The cleaning liquid injection nozzle group 13 and the high pressure gas injection nozzle group 14 may be collectively referred to as the cleaning liquid injection nozzle 7 and the high pressure gas injection nozzle 9, respectively.

  As will be described later, in the filter cleaning apparatus 1 according to the present invention, the filter 2 to be cleaned is transferred by the conveyor 5, the cleaning liquid 6 is sprayed to the filter 2 by the cleaning liquid spray nozzle group 13, and the high-pressure gas spray nozzle is downstream thereof. Only the high-pressure gas 8 is sprayed onto the filter 2 by the group 14, so that the foreign matter of 1 μm or more collected on the filter medium 3 of the filter 2 is effectively washed down to the inside of the filter medium 3, and only the foreign substance peeled off from the fiber surface Instead, it is possible to extrude foreign matter collected between the fibers.

  At this time, when the cleaning liquid 6 is jetted from the cleaning liquid jet nozzle group 13 onto the upper surface of the filter 2, the filter 2 is vibrated from below by the vibration plate 10 a, and the high pressure gas 8 is jetted from the high pressure gas jet nozzle group 14. By vibrating the filter 2 from below by 10b, the sub-micrometer minute foreign matter adhering to the fiber of the filter medium 3 can be peeled off and extruded with high-pressure gas. The speed of the high-pressure gas injected to the filter 2 is preferably in the range of about 50 m / s to about 300 m / s.

  The cleaning liquid 6a sprayed to the filter 2 by the cleaning liquid spray nozzle 7a is sent from the cleaning liquid tank (not shown) through the cleaning liquid pipe 16 using the cleaning liquid pump 15. The high-pressure gas 8 injected into the filter 2 by the high-pressure gas injection nozzle 9 is supplied from a compressor (not shown) or a cylinder (not shown), and is placed in the middle of the gas pipe 17 connected to the high-pressure gas injection nozzle 9. By providing the opening / closing valve 18 and operating the opening / closing valve 18, it is possible to inject and stop the high-pressure gas to the filter 2.

Next, the process of cleaning the filter 2 using the filter cleaning apparatus 1 shown in FIG. 1 will be described.
The filter 2 placed on the roller conveyor 5 is transported inside the filter cleaning device 1 as the rollers of the roller conveyor 5 rotate. When the filter 2 approaches the cleaning liquid ejection nozzle 7a, the arrival of the filter 2 is detected by the filter position detection sensor 19a. As the filter position detection sensor 19a, a sensor using light, a sensor detecting by contact, or the like can be used.

  When the filter position detection sensor 19a detects the filter 2, a detection signal (not shown) is sent to the cleaning liquid pump 15 and the vibrator 11a. As a result, the cleaning liquid 6a is sprayed from the cleaning liquid spray nozzle 7a onto the filter 2, and the vibrator 11a vibrates the vibration plate 10a on the cleaning liquid spray nozzle 7a side with the vibrating rod 12a.

The filter frame 4 or the filter medium 3 of the filter 2 vibrates due to the vibration of the diaphragm 10a. The amplitude and frequency of the diaphragm 10a can be changed by adjusting the vibrator 11a or the vibration rod 12a connecting the diaphragm 10a and the vibrator 11a.
Further, in FIG. 1, the shape of the diaphragm 10 a is a curved shape that is convex upward. This is to prevent the filter 2 conveyed by the roller conveyor 5 from being obstructed by the diaphragm 10a.

  The shape of the diaphragm 10a may be any shape as long as it does not hinder the movement of the filter 2 by the roller conveyor 5. For example, in the case of a structure that is convex upward, as described later, the diaphragm The amplitude and frequency of the diaphragm 10a greatly contribute to the vibration of the filter medium 3 constituting the filter 2 by 10a. In order to vibrate the filter medium 3 constituting the filter 2 as a whole, the amplitude of the diaphragm 10a is set in a range from 0.1 mm to 10 mm, and the frequency of the diaphragm 10a is set in a range from 5 Hz to 500 Hz. .

When the cleaning liquid 6a is sprayed from the cleaning liquid spray nozzle 7a onto the filter 2 vibrated by the vibration plate 10a, the filter medium 3 constituting the filter 2 also vibrates, so that the cleaning liquid 6a penetrates into the filter medium 3 as compared with the case where no vibration is performed. It becomes easy.
As a result, the cleaning liquid 6a soaks into the surface of the fibers intertwined in the mesh form forming the filter medium 3 and the inside of the mesh of the fibers. When the filter medium 3 is vibrating, the fibers forming the filter medium 3 are also vibrating, and the cleaning liquid 6a attached to the fiber surface is also vibrated.

  Due to the vibration of the cleaning liquid 6a on the surface, the air layer around the sub-μm minute foreign matter adhering to the fiber surface is pushed out by the cleaning liquid 6a, and the sub-μm minute foreign matter is covered with the cleaning liquid. Further, due to vibration of the cleaning liquid 6a and the fiber, the cleaning liquid 6a penetrates into a portion where the fine foreign substance of sub-μm is in contact with the fiber. Thereby, the sub-micrometer minute foreign matter is peeled off from the fiber surface by the chemical action of the cleaning liquid 6a.

  The filter 2 is further conveyed downstream by the roller conveyor 5, and the cleaning liquid 6b is sprayed from the lower surface side of the roller conveyor 5 through the cleaning liquid spray nozzle 7b. The cleaning liquid 6b sprayed from the lower surface side of the filter 2 enters the inside of the filter medium on the lower surface and the lower surface side of the filter 2, and the filter medium is immersed in the cleaning liquid. Thereby, the foreign material captured between the fibers or the fibers in the filter medium near the filter lower surface and the filter lower surface can be peeled off.

  The filter 2 conveyed downstream by the roller conveyor 5 is further detected by a filter position detection sensor 19b installed in the vicinity of the high-pressure gas injection nozzle 9, and a detection signal (not shown) from the filter position detection sensor 19b. ) Opens the on-off valve 18 and the high-pressure gas 8 is injected from the high-pressure gas injection nozzle 9.

  In addition, the diaphragm 10b is driven by the vibrator 11b, and the diaphragm 10b vibrates via the vibrating rod 12b. When the filter 2 is vibrated by the diaphragm 10b, the filter medium 3 constituting the filter 2 also vibrates. In addition, the fibers intertwined in the mesh form forming the filter medium 3 also vibrate. When the high pressure gas 8 is injected in a state where the filter medium 3 vibrates, the path of the high pressure gas 8 is disturbed by the vibrating fiber, so that turbulent flow is generated on the fiber surface, and the high pressure gas 8 hits the fiber surface. A flow occurs.

  As a result, the sub-μm minute foreign matter attached to the fiber surface and peeled off by the cleaning liquid 6 is also struck by the turbulent flow, and the sub-μm minute foreign matter on the fiber surface is pushed out by the high-pressure gas 8. Further, in the filter cleaning apparatus 1 that vibrates the filter 2 and injects the cleaning liquid 6 and the high-pressure gas 8, the cleaning effect is enhanced even for foreign matters of 1 μm or more, so the amount of cleaning liquid used for cleaning can be reduced. There is also an effect that it can be done.

  Next, the process of vibrating the filter medium 3 disposed inside the filter 2 and the fibers forming the filter medium 3 while the vibration caused by the diaphragm 10 installed immediately below the cleaning liquid injection nozzle 7 or the high-pressure gas injection nozzle 9 is vibrated. explain.

  FIG. 4 is a diagram illustrating the difference in vibration of the filter 2 when the filter 2 is vibrated using the diaphragm 10 and the roller 5 in the step of spraying the cleaning liquid 6 from the cleaning liquid spray nozzle 7. The vibration described in Patent Document 2 and Patent Document 3 described above corresponds to vibrating the transport system by vibrating the roller connecting member 20 that connects the roller 5 in FIG. When the filter 2 is vibrated by this method, when the frequency is low, the entire filter 2 moves up and down in the same manner as the conveying system, so the filter medium 3 installed in the filter 2 and the fiber itself forming the filter medium 3 Is not vibrating.

  In order to apply fine vibrations to the filter medium 3, if the vibration frequency is increased by adjusting the vibration frequency of the roller connecting member 20 with the vibration device 11, the filter 2 is separated from the roller conveyor 5 due to inertial force, and the roller from the vibration device 11. The vibration applied to the connecting member 20 is not transmitted to the filter 2.

  On the other hand, when the vibration is applied to the filter 2 using the vibration plate 10 installed immediately below the cleaning liquid injection nozzle 7 as in the present invention shown in FIG. 4 (2), the entire filter 2 vibrates if the frequency is low. The same vertical movement as the plate 10 is performed. When the frequency of the vibrator 11 is increased, the filter 2 tends to be separated from the diaphragm 10 by inertial force. At this time, when the cleaning liquid 6 is sprayed from the cleaning liquid spray nozzle 7 onto the filter 2, a force is applied to press the filter 2 against the diaphragm 10 by the cleaning liquid 6. Thereby, the filter 2 can be vibrated at the same frequency as that of the diaphragm 10 without the filter 2 being separated from the diaphragm 10.

  Even in the method of vibrating the conveyance system shown in Patent Document 2 and Patent Document 3 described above, the force to push back the object to be cleaned by the cleaning liquid or high-pressure gas sprayed on the object to be cleaned works, but the target is cleaned by the cleaning liquid or high-pressure gas. Since the force to push back the object is weaker than the force to vibrate the transport system, if the frequency is increased, the vibration of the transport system is not transmitted to the object to be cleaned. Further, Patent Document 2 and Patent Document 3 described above do not describe the effect of pressing an object to be cleaned with a cleaning liquid or a high-pressure gas.

Here, the case where the height position of the diaphragm 10 in the embodiment shown in FIG. 4 (2) is adjusted will be described below.
FIG. 5 partially shows a filter transporting process in the case where the height position of the diaphragm 10 is adjusted using the height adjusting mechanism 30.

  In FIG. 5A, the height adjustment mechanism 30 causes the diaphragm 10 to be positioned at the highest position (the position of the diaphragm shown by the solid arc portion in FIG. 5) and the lowest position (shown by the dotted arc portion in FIG. 5). The example of arrangement | positioning in case the height position of the diaphragm 10 in the lowest position is always higher than the conveyance surface of the roller conveyor 5 is shown. The height adjusting mechanism 30 is provided between the diaphragms 10a and 10b and the vibrators 11a and 11b, respectively.

As shown in the figure, when the lowest position of the diaphragm 10 is higher than the conveying surface of the roller conveyor 5, the filter 2 rides on the diaphragm 10 and rises to the left, and only the diaphragm 10 and one roller conveyor 5 are placed. It becomes the form supported by. The filter 2 supported in this manner is not conveyed because the force conveyed by the rotation of the roller conveyor 5 becomes weak.
Therefore, such a conveyance state of the diaphragm 10 is inappropriate, and the height position of the diaphragm 10 is also inappropriate.

  On the other hand, FIG. 5B shows an arrangement example when the height adjustment mechanism 30 is used to adjust the diaphragm 10 so that the lowest position is always lower than the conveying surface of the roller conveyor 5. Thus, in the state where the lowest position of the diaphragm 10 is lower than the conveying surface of the roller conveyor 5, the filter 2 and the diaphragm 10 are separated from each other, so that the plurality of roller conveyors 5 and the filter 2 are in contact with each other. Therefore, the conveyance force by the roller conveyor 5 with respect to the filter 2 becomes strong, and the filter 2 is favorably conveyed on the conveyance surface of the roller conveyor 5.

Because of such a conveyance force, even if the diaphragm 10 reaches the highest position and the filter 2 moves up to the left, it is possible to continue the conveyance by the inertial force.
Therefore, the diaphragm 10 is preferably set to such a height.

FIG. 6 shows an example in which the height position of the diaphragm 10 is adjusted using the vibration rod 31 coupled to the vibration plate 10 and the vibration rod 32 connected to the vibrator 11.
In FIG. 6, a cylindrical joint 34 provided with a slit 33 is attached to the end of a vibrating bar 32 connected to the vibrator 11. The vibration bar 31 coupled to the vibration plate 10 is inserted into a cylindrical joint 34 attached to the vibration bar 32 and fixed to the cylindrical joint 34 by a fixing screw 35.

  Although not shown in FIG. 6, the vibrating rod 31 is provided with a screw hole that allows the fixing screw 35 to pass therethrough. By tightening the fixing screw 35 through the slit 33 and the screw hole, the vibrating rod 31 and the cylindrical joint 34 are provided. Can be fixed. According to this configuration, the height of the diaphragm 10 can be adjusted by changing the length of the vibrating rod 31 inserted into the cylindrical joint 34.

  The means for changing the height of the diaphragm 10 is not limited to the configuration shown in FIG. 6, and can be adjusted, for example, by changing the vibrating bar 32 to another vibrating bar having a different length or shape.

  And when adjusting the lowest position of the diaphragm 10 set by the height adjusting mechanism 30 to be lower than the conveying surface of the roller conveyor 5, the highest position of the diaphragm 10 is vibrated by the vibrator 11. The vertical amplitude of the vibrator 11 is adjusted so as to be higher than the conveying surface of the roller conveyor 5, that is, the amplitude W of the diaphragm 10 shown in FIG.

  The vibration plate 10 adjusted in this way vibrates up and down across the conveying surface of the roller conveyor 5. Since the vibration plate 10 is positioned below the conveyance surface of the roller conveyor 5, the filter 2 is conveyed in contact with the plurality of roller conveyers 5, so that the filter 2 is disposed at the time of cleaning and high-pressure gas injection. Even if the filter 2 is above the filter 2, the filter 2 is favorably transported on the transport surface by the roller conveyor 5.

When the frequency of the filter 2 vibrated by the diaphragm 10 increases, the fibers forming the filter medium 3 installed inside the filter 2 vibrate with each other.
The process in which the vibration of the fibers forming the filter medium 3 changes according to the frequency will be described with reference to FIG. In FIG. 7, it is assumed that the fibers are simplified as elastic springs, and the springs are arranged vertically and horizontally.

  In FIG. 7 (1), the state of the fiber in a state where no vibration is applied before the vibration is shown. All the fibers simplified by the spring are aligned vertically and horizontally. Lines surrounding the springs arranged vertically and horizontally as shown in the figure represent the filter medium.

  In FIG. 7 (2), double-ended arrows indicate the vibration width. When the frequency is low, the entire filter medium moves up and down along with the vibration, so the springs representing the fibers move while maintaining the mutual position. In this state, since the sub-μm minute foreign matter and the cleaning liquid adhering to the fiber surface also move with the fiber, the penetration of the cleaning liquid into the sub-μm foreign matter and the fiber interface by the cleaning liquid is not promoted. Further, the flow on the fiber surface by the high-pressure gas also becomes a steady flow. As the frequency increases, the fibers that have moved up and down together will gradually move apart. This occurs because the length of the fibers forming the filter medium and the position of the location where the fibers are connected are not constant.

  In FIG. 7 (3), frequency regions where the fibers vibrate with each other are shown, and the lengths of the springs are varied. When the vibration frequency is further increased, the movement of the fiber cannot follow the vibration frequency, so that only the portion where the vibration is applied vibrates and the vibration does not propagate to the surroundings.

Further, in FIG. 7 (4), a high frequency region corresponds.
When the filter 2 is vibrated by the diaphragm 10 in FIG. 1, the frequency up to 5 Hz corresponds to the low vibration region in FIG. 7 (2), and the frequency in the frequency range from 5 Hz to 1000 Hz is the mutual fiber in FIG. This corresponds to a frequency region that vibrates. When the frequency exceeds 1000 Hz, the high frequency region shown in FIG. 7 (4) is obtained, and the vibration applied to the filter 2 by the diaphragm 10 is not transmitted to the entire filter medium 3.

  The force applied to the filter 2 by the diaphragm 10 depends on the frequency and the amplitude of vibration. For this reason, when the frequency and the amplitude of the vibration are increased simultaneously, the force that vibrates the filter 2 presses the filter 2 with the cleaning liquid 6 injected by the cleaning liquid injection nozzle 7 or the high-pressure gas injected from the high-pressure gas injection nozzle 9. 8 is higher than the force pressing the filter 2, the filter 2 leaves the diaphragm 10. In order to prevent this, it is necessary to set the amplitude of vibration of the diaphragm 10 within a range of 0.1 mm to 20 mm.

  The frequency and amplitude of the diaphragm 10 that mutually vibrates the fibers constituting the filter medium 3 differ depending on the size and shape of the filter 2, but the frequency is set between 5 Hz and 1000 Hz, optimally between 10 Hz and 500 Hz. . The vibration amplitude of the diaphragm 10 is set in the range of 0.1 mm to 20 mm, and optimally in the range of 0.5 mm to 10 mm.

  FIG. 8 shows the results of cleaning a medium performance filter of 610 mm in length, 610 mm in width, and 30 mm in thickness. This is a result of measuring the whiteness of the filter medium by cutting a part of the filter medium after washing with the cleaning liquid by the cleaning liquid injection nozzle and the high-pressure gas by the high-pressure gas injection nozzle while vibrating at a vibration frequency of 100 Hz and an amplitude of 1 mm.

  A spectrophotometer was used for the whiteness measurement, and the whiteness was determined as an L value. The L value indicating the whiteness is a numerical value from 0 to 100, and approaches 0 when the measurement object is black, and approaches 100 as the measurement object becomes white. The whiteness (L value) of the filter medium before washing as shown in FIG. 8 (1) was 20, but when washed by applying vibration as shown in FIG. 8 (2), the whiteness increased to 45. In addition, the whiteness increased to 35 when no vibration was applied as shown in FIG. Compared to the case where no vibration was applied, the whiteness increased by about 10 when the vibration was applied. It was shown that the cleaning effect is improved by vibration.

Embodiment 2. FIG.
FIG. 9 shows a main part of an apparatus for explaining Embodiment 2 of the filter cleaning apparatus 1 according to the present invention, and some components shown in FIG. 1 are omitted. In FIG. 9, vibrating rollers 21a and 21b are installed as vibrating bodies instead of the vibrating plates 10a and 10b shown in FIG. Further, shafts 22a and 22b are passed through the centers of the vibration rollers 21a and 21b, and the shafts 22a and 22b are connected to the vibrators 11a and 11b by the vibration rods 12a and 12b, respectively. The vibrating rollers 21a and 21b are configured to freely rotate around the mandrels 22a and 22b. The vibration rollers 21 a and 21 b are arranged in a direction perpendicular to the traveling direction of the filter 2 so as to coincide with the arrangement of the cleaning liquid injection nozzles 7 and the arrangement of the high-pressure gas injection nozzles 9.

According to the configuration shown in FIG. 9, the filter 2 conveyed by the roller conveyor 5 is vibrated by the vibrating rollers 21a and 21b. At this time, since the vibrating rollers 21a and 21b freely rotate around the mandrels 22a and 22b, when the filter 2 moves on the vibrating rollers 21a and 21b, the vibrating rollers 21a and 21b have the same traveling speed as the filter 2. Rotate.
As a result, the filter 2 is not prevented from advancing by the vibration rollers 21a and 21b. In FIG. 9, the vibrating rollers 21a and 21b that freely rotate around the mandrels 22a and 22b are shown, but a structure in which a plurality of rings are attached instead of the vibrating rollers 21a and 21b may be used.

  Also in the second embodiment, the height adjusting mechanism 30 shown in FIGS. 5 and 6 can be provided between the vibrating rollers 21 a and 21 b and the vibrator 11.

DESCRIPTION OF SYMBOLS 1 Filter cleaning apparatus; 2 Filter; 3 Filter material; 4 Filter frame; 5 Roller conveyor; 6, 6a, 6b Cleaning liquid; 7, 7a, 7b Cleaning liquid injection nozzle; 8 High pressure gas; 9 High pressure gas injection nozzle; 11, 11a, 11b Vibrator; 12, 12a, 12b Vibrating rod; 13 Cleaning liquid injection nozzle group; 14 High-pressure gas injection nozzle group; 15 Cleaning liquid pump; 16 Cleaning liquid piping; 17 Gas piping; 18 Open / close valve; 19b Filter position detection sensor; 20 Roller connecting member; 21a, 21b Vibrating roller; 22a, 22b Mandrel; 30 Height adjusting mechanism; 31 Vibrating rod connected to the diaphragm;
32 Vibrating rod connected to vibrator; 33 slit; 34 cylindrical joint; 35 fixing screw.

Claims (10)

A filter transport unit that transports a filter that collects foreign matter on a filter medium in which fibers are entangled in a mesh;
An upper cleaning liquid spray nozzle that sprays cleaning liquid on the filter from above the filter transport section and separates the foreign matter from the filter;
A high-pressure gas injection nozzle that injects high-pressure gas from above the filter transport unit on the downstream side in the transport direction of the upper cleaning liquid spray nozzle and pushes the foreign matter separated from the fiber out of the filter;
First and second vibrating bodies that vibrate the filter at the position of the filter transport section respectively facing the injection positions of the upper cleaning liquid injection nozzle and the high-pressure gas injection nozzle;
A filter cleaning apparatus comprising: a vibrator for applying vibration to the first and second vibrating bodies. The filter conveying unit is a roller conveyor, and the vibrating body is a diaphragm that extends upward from the lower side of the roller conveyor and forms a convex portion on the upper side. Filter cleaning equipment. 3. The filter cleaning device according to claim 1, wherein a frequency of the vibrating body by the vibrator is 5 Hz to 1000 Hz, and an amplitude of the vibrating body is 0.1 mm to 20 mm. A height adjusting mechanism for changing the height position of the first and second vibrating bodies up and down with respect to a filter carrying surface on the filter carrying unit on which the filter moves, the first and second vibrating bodies The filter cleaning device according to any one of claims 1 to 3, wherein the filter cleaning device is provided between the filter and the vibrator. The filter cleaning apparatus according to claim 4, wherein the height adjusting mechanism is adjusted so that a lowest position of the vibrating body vibrates across the filter transport surface. The lower cleaning liquid spray nozzle that spreads the cleaning liquid on the filter from below the filter transport unit and separates the foreign matter from the filter is installed by being shifted from the upper cleaning liquid spray nozzle by a set interval. Filter cleaning equipment. The filter cleaning apparatus according to claim 1, wherein the vibrating body is a vibrating roller. A filter that collects foreign matters is transported to a filter medium in which fibers are entangled in a mesh shape.
The cleaning liquid is sprayed onto the filter from above the transported filter and the filter is vibrated by a vibrating body from below the filter at the cleaning liquid spraying position to separate the foreign matter from the filter.
The high pressure gas is injected from above the transported filter downstream of the cleaning liquid injection position, and the filter is vibrated by another vibrating body from below the filter at the high pressure gas injection position from the filter. A filter cleaning method for extruding the separated foreign matter to the outside of the filter. The filter cleaning method according to claim 8, wherein a frequency of the vibration is 5 Hz to 1000 Hz, and an amplitude of the vibration is 0.1 mm to 20 mm. The filter cleaning method according to claim 8, wherein the cleaning liquid is sprayed on the filter from below the filter at a position shifted by a set interval from the ejection of the cleaning liquid, and the foreign matter is separated from the filter.

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