JP2500494Y2 - Filtration device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration device having a backwash mechanism.

[0002]

2. Description of the Related Art For example, when performing wastewater treatment, it is necessary to remove contaminants such as dust contained in raw water (that is, water to be treated) as a pretreatment for such purpose. A filtration device is used.

By the way, in general, a filtering device is provided with a filtering mechanism for actually separating contaminants from raw water and a function recovery mechanism for recovering its filtering function by eliminating clogging by the contaminants of the filtering mechanism. There is. Then, in general, while adopting a screen composed of a flat net as a filtering mechanism, scraping off contaminants such as dust attached to the screen by using an electric brush or an electric wiper as a function recovery mechanism thereof, Alternatively, the screen is turned upside down to remove the contaminants.

On the other hand, a mesh tube is adopted as a filtering mechanism, and raw water is made to flow from the inside to the outside of the mesh tube, and when the mesh tube is clogged, the mesh tube is rotated. There is also an idea to eliminate the clogging by a so-called backwashing action of spraying the cleaning water from the outer peripheral side with the spraying nozzle to remove the contaminants adhering to the inner peripheral surface side.

[0005]

However, since the filtering device having a configuration in which a flat screen and an electric brush, etc. are combined has a mechanical action, there is a limit to the scraping ability of the contaminants. In addition, there is a problem that the filtration capacity is poor because the filtration performance of the structure having a low substance removal capacity and a screen reversal requires interruption of the filtration work. hard.

Further, in the backwashing type filtration device, since it is necessary to backwash the whole area of the mesh tube, a reciprocating mechanism for reciprocating the injection nozzle in the axial direction of the mesh tube is provided.
Alternatively, it is necessary to arrange a plurality of injection nozzles in the axial direction of the reticulated tubular body, and in any case, there is a problem that the cost is increased due to the complicated structure. Furthermore, since the jet flow from such an injection nozzle is sprayed on the surface of the reticulated tubular body with a relatively large spread, and this is continuously performed, the impact force of the jet flow on the contaminants is relatively weak and its removal capability is also low. However, there is also a problem that it takes time to recover the filtering function.

Therefore, the present invention introduces water to be filtered into a cylindrical screening member to filter it, and removes contaminants adhering to the inner surface of the screening member by backwashing to improve the filtering performance. This is a filter device that is designed to be recovered so as to realize effective cleaning of the screening member with a simple and inexpensive structure.

[0008]

According to the present invention, as a concrete means for solving the above problems, a cylindrical screening member configured to allow water to flow is disposed in a casing and is rotationally driven. At the same time, water to be filtered is introduced to the inner surface side of the screening member, and the water to be filtered is circulated from the inner surface side to the outer surface side of the screening member to trap contaminants such as dust in the water to be filtered on the inner surface side. The collecting mechanism and the filtering mechanism are fixed to each other on the outer peripheral surface of the casing of the filtering mechanism in a substantially parallel state, and at the fixing portion with the casing, the fixing portion is radially penetrated through in the axial direction of the casing. An outer cylinder member facing the screening member in the casing through a slit formed so as to extend, and a relatively rotatably fitted and arranged inside the outer cylinder member. A large number of injection holes are sequentially formed on the outer peripheral wall in a spiral shape at a predetermined interval, and an inner cylinder member into which backwash water is introduced, and a drive means for rotationally driving the inner cylinder member at a predetermined speed. And a backwashing mechanism section provided with.

[0009]

In the present invention, the following action can be obtained by adopting such a configuration. That is, in the filtration mechanism part, the filtered water is introduced inside the screening member rotating in the casing, and when the filtered water passes through the screening member and flows to the outer surface side, it is mixed in the filtered water. The contaminants such as dust are collected by the screening member, and the filtered water is filtered by this.

On the other hand, by filtering the water to be filtered, the screening member gradually becomes clogged with the collected contaminants, and its filtering performance deteriorates. In this case, however, the backwashing mechanism part clogs the screening member. The state is resolved and the filtration performance is restored. That is, the inner cylinder member is rotated in the outer cylinder member of the backwashing mechanism portion which is fixed to the outside of the casing and faces the outer surface side of the screening member in the casing through the slit, and the inner cylinder member is spirally wound on the peripheral wall of the inner cylinder member. A large number of injection holes sequentially formed in a predetermined pattern are sequentially polymerized while moving the polymerization position with respect to the slit in the longitudinal direction of the slit, so that backwash water is passed through the slits from the sequentially polymerization injection holes. It is sprayed onto the outer surface of the screening member, the contaminants are removed from the screening member by the dynamic pressure impact force, and the filtering function of the screening member is restored.

[0011]

Therefore, according to the filtering device of the present invention, when the clogging condition of the screening member is eliminated by washing with backwash water, the inner cylinder member is rotated in the outer cylinder member to change the jet position. Since the entire area of the screening member can be cleaned by reciprocating in the axial direction of the screening member, for example, in the case of a configuration including a nozzle moving means for reciprocating the injection nozzle in the axial direction of the screening member as in a conventional filtering device. In comparison, it is possible to obtain an effective backwashing action of the screening member with a simple and inexpensive structure.

Further, as the inner cylinder member rotates, the respective injection holes formed in the inner cylinder member are successively overlapped with the slit, so that the jet flow injected to the screening member side through the slit becomes intermittent. Compared to the case where the water is continuously ejected from the ejection nozzle, the impact force applied to the screening member is large, and the backwash water is ejected from the nozzle hole of the inner cylinder member through the slit as it is. Is maintained well, and the energy density contributing to cleaning is large as compared with the case where the jet flow from the jet nozzle diffuses into a relatively large range as in the case of a conventional filtration device using the jet nozzle. As a synergistic effect of, the more reliable and rapid removal of contaminants is achieved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The filtering device of the present invention will be described below in detail with reference to the accompanying drawings. A filtering device Z according to an embodiment of the present invention is shown in FIGS. This filter Z
In the wastewater treatment facility, as pretreatment, raw water to be filtered is filtered to remove relatively large contaminants such as dust mixed in with it and supplied to the treatment facility as clean water. A filtration mechanism section X and a backwash mechanism section Y described later are provided.

Filtration Mechanism Section X The filtration mechanism section X comprises a casing 1, a screening member 2 and a screw rod 3 which will be described later.

The casing 1 is constituted by a pipe end member 8 at one end 1a and a pipe end member 11 at the other end 1b, which is a closed pipe having a predetermined diameter and length. Further, a clean water outlet 6 is provided at an axial middle portion of the casing 1, and a contaminant discharge port 7 is provided at a position near the other end 1b so as to project from the pipe wall in the same direction. Further, the pipe end member 8 is provided with a raw water inlet 9 and a drain outlet 10.

In this case, the drain discharge port 10 is
The clean water outlet 6 and the contaminant discharge port 7 are provided close to the projecting wall surfaces. On the other hand, the raw water inlet 9 is provided in the intermediate region between the bearing 33 and the collar 25, which is provided on the rear surface side of the pipe end member 8 and offset from the center thereof by a predetermined amount on the side opposite the drain discharge port 10. So that it is located
One or more are provided.

The casing 1 has one end 1
The bracket 45 protruding on the a side is fixed to the short first support leg 41 by the connecting pin 46, and the other end 1b
A state in which the drain discharge port 10, the clean water discharge port 6, and the contaminant discharge port 7 are directed downward by fixing the bracket 48 projecting to the side to the long second support leg 42 by the connecting pin 50. In addition, the one end 1a is arranged in an inclined state with the one end 1a positioned in the lower position.

In this case, the second support leg 42 has a two-part structure composed of a pair of leg members 43 and 44 which are foldably connected by a pair of connecting pins 51 and 52.
The casing 1 (that is, the filtering device Z) is arranged in an inclined manner as shown by a solid line in FIG. 1 by setting the second support leg 42 in an upright state (hereinafter, this posture is referred to as a driving posture). When the second support leg 42 is bent, the second support leg 42 is placed substantially horizontally as shown by a chain line in the figure (see reference numeral Z ') (hereinafter, this posture is referred to as an inspection posture).

The screening member 2 is formed by forming a net having a predetermined number of meshes into a tubular shape having a diameter smaller than the inner diameter of the casing 1 and having collars 2 at both axial ends thereof.
4, 25 and the end member 22 coaxially connected to each other by a plurality of connecting bars 23, 23, ... At a position axially separated from one collar 24 of the net tube 21. Composed. In this screening member 2, the other collar 25 portion is fitted inside the guide collar 26 provided on the pipe end member 8 located on the one end 1a side of the casing 1 and the end face thereof contacts the pipe end member 8. By being brought into contact with each other, they are rotatably arranged inside the casing 1 and offset upward. Also,
The end member 22 portion of the screening member 2 is rotatably supported by a bearing 32 arranged between the end member 22 and the screw rod 3 described later.

Further, the screening member 2 has the connecting bar 2 in the state of being arranged in the casing 1.
The axial length of the mesh pipe 21 is set so that the portion corresponding to the contaminant discharge port 7 is set to the connecting bar 23, 23, ... facing the contaminant discharge port 7. Opening 27
And In this case, the drain outlet 10 is opened outside the screening member 2, and the raw water inlet 9 is opened inside the screening member 2.

The screw rod 3 is a rod body which is longer than the casing 1 by a predetermined dimension, and has a first spiral blade 4 and a second spiral blade whose outer circumference is slightly smaller than the inner circumference of the screening member 2. And 5 are attached. These two spiral blades 4,5
Among them, the first spiral blade 4 is provided over the entire range corresponding to the mesh tube 21 of the screening member 2, and the second spiral blade 5 corresponds to the portion of the opening 27 near the end member 22. It is provided.

The twisting directions of the two spiral blades 4 and 5 are set to be opposite to each other. Further, in this embodiment, as shown in FIG. 1, the pitch of the first spiral blade 4 is set so as to gradually decrease from the one end 3a side of the screw rod 3 toward the other end 3b side.

The screw rod 3 having the above structure is
The one end 3a is supported by the bearing 33 of the pipe end member 8, while the other end 3b is supported by the bearing 31 on the pipe end member 11 side with the pipe end member 11 penetrating through the bearing 33 and the coupling. It is connected to the motor 13 via 14. The motor 13 is fixed to the motor base 12 connected to the pipe end member 11.

Further, the other end 3 of the screw rod 3
A drive gear 15 is fixed to the b side, and the drive gear 15 is connected to a driven gear 17 via an intermediate gear 16. The driven gear 17 is fixed to the end member 22 of the screening member 2. Therefore, when the screw rod 3 is rotationally driven to one side by the motor 13, the screening member 2 is rotationally driven in the opposite direction and at a lower speed than the screw rod 3 (see FIG. 2). Here, the rotation direction of the motor 13 is set such that the first spiral blade 4 of the screw rod 3 apparently moves from the one end 3a side of the screw rod 3 toward the other end 3b side. .

In the casing 1, reference numeral 28 is a baffle plate provided at a position corresponding to the lower edge of the contaminant discharge port 7 in the casing 1, reference numeral 3
4 and 35 are sealing materials.

Backwashing Mechanism Y The above-mentioned backwashing mechanism Y constitutes an essential part of the present invention, and as shown in FIGS. 1 to 3, an outer cylinder member 61 and an inner cylinder member 62 which will be described later. Is equipped with.

The outer cylinder member 61 is composed of a cylinder body having an axial length of about 1/2 of the casing 1, and both ends thereof are closed by cylinder end members 65 and 66, respectively.
(Note that the tube end member 66 is screwed to the outer tube member 61). The outer cylinder member 61 is welded and fixed to the upper surface side of the lower half portion of the casing 1 in the axial direction in a close contact state in a direction parallel to the casing 1, and
A slit 64 having a predetermined width is formed in the close contact portion, the slit 64 penetrating the peripheral wall of the outer cylinder member 61 and the peripheral wall of the casing 1 in the radial direction and extending in the axial direction thereof. The inside and the inside of the casing 1 are the slits 6
4 are in communication with each other. Therefore, from the inside of the outer cylinder member 61, the outer peripheral surface of the screening member 2 arranged in the casing 1 can be seen through the slit 64.

The inner cylinder member 62 is composed of a cylinder body having an outer diameter dimension and an axial length which can be fitted into the outer cylinder member 61.
One end of the inner cylinder member 62 is a shaft member 54 penetrating the cylinder end member 65 and protruding outward, and the other end is the connecting pipe 7.
They are closed by end plates 55 provided with four. The shaft member 54 has a coupling 58.
Also, the connecting pipe 74 is rotatably supported by a bearing 67 while being connected to the motor 56 via a speed reducer 57. still,
In FIG. 3, reference numerals 69 to 72 are sealing materials that seal the outer cylinder member 61 and the inner cylinder member 62 at their shaft end portions.

Further, on the outer peripheral wall of the inner cylinder member 62,
Small-diameter injection holes 63 are formed in a spiral shape over substantially the entire length thereof at predetermined intervals. Therefore, when the inner cylinder member 62 rotates in the outer cylinder member 61, the injection holes 63, 63, ... Sequentially overlap with the slit 64, and when viewed from the slit 64 side, the injection holes 63 that overlap with the injection holes 63, 63 ,. The slit 64 moves from one end to the other end.

On the other hand, the connecting pipe 74 has a structure shown in FIGS.
As shown in, a backwash water supply pipe 75 is connected via a rotary joint 73. Further, the upstream end of the backwash water supply pipe 75 is connected to a backwash water pump 78, and the backwash water sucked through the suction pipe 77 from the backwash water inlet 76 formed on the outer peripheral wall of the casing 1 is supplied. It can be supplied to the inside of the inner cylinder member 62. The backwash water pump 78 is driven by a motor 80 via a coupling 79. The backwash water pump 78, the speed reducer 79 and the motor 80 are provided on the casing 1 side.
It is attached to 1.

Operation Next, the operation of the filtering device Z having the above-described structure will be described. With the filtering device Z set in the operating posture,
First, a separately installed raw water pump (not shown) is started, and the raw water pump introduces raw water (that is, water to be filtered) from the raw water inlet 9 into the inside of the screening member 2 of the filtration mechanism section X. The motor 13 is also started at the same time when the raw water pump is started, and the screening member 2 and the screw rod 3 simultaneously start rotating in opposite directions. Further, after the filtration mechanism section X is activated, the motor 56 is activated with a predetermined delay time, and the backwash mechanism section Y is activated.

Here, first, on the side of the filtration mechanism section X,
When the raw water introduced into the screening member 2 flows out through the mesh pipe 21 portion of the screening member 2 to the outside thereof, contaminants such as dust mixed therein are collected by the mesh pipe 21. Filtered to clean water. Then, the clean water is discharged from the clean water discharge port 6 as the water level rises above the lower edge portion 6a of the clean water discharge port 6, and is sent to the subsequent treatment process.

On the other hand, the mesh tube 2 of the screening member 2
The contaminants collected in 1 and attached to the inner peripheral surface of the mesh tube 21 are the screening member 2 and the screw rod 3.
When and are rotated relative to each other, the first spiral blades 4 of the screw rod 3 which are close to the inner peripheral surface of the mesh tube 21 are gradually lifted up, and finally the connecting bars 23, 23 of the screening member 2 are connected. , Is taken out from the inside of the screening member 2 to the outside, and is discharged to the outside from the contaminant discharge port 7 corresponding to the opening 27.

In this case, the contaminants collected on the side of the mesh pipe 21 by the filtering action are lifted up while being taken out from the water accumulated in the lower portion of the casing 1, and
Since the pitch of the spiral blades 4 gradually decreases as it goes upward and the contaminants are gradually squeezed by the first spiral blades 4, the contaminants are discharged from the contaminant discharge port 7
The amount of water adhering to the contaminants is as small as possible at the time when the temperature reaches the temperature. That is, the contaminants are discharged from the contaminant discharge port 7 in a sufficiently drained state. Therefore, for example, it is not necessary to receive the discharged mixed matter again in the draining container to drain the drained mixture, and the workability is good.

Further, when the contaminants are scraped up by the first spiral blades 4 in this way, the water drops from the mesh pipe 21 due to the draining action in the middle, but the inflow of the fallen water into the contaminant discharge port 7 is prevented. , Baffle plate 28 prevents this. Further, the contaminants that have been scraped up by the first spiral blade 4 and reached the opening 27 are the end members 22.
If it is pressed to the side, there is a risk of depositing on this portion, but in this embodiment, a second spiral blade 5 having a twist direction opposite to that of the first spiral blade 4 is provided to allow the contaminants to flow downward. Since it is pushed back to, such a problem can be prevented.

On the other hand, as described above, the first spiral blade 4
Even if the contaminants collected on the inner surface side of the mesh tube 21 are sequentially raked upward, the effect of eliminating the contaminants by the first spiral blade 4 is not perfect, and a part of them gradually enters the mesh of the mesh tube 21. As a result, a clogging condition is caused, which eventually leads to a decrease in filtration performance of the screening member 2. In such a case, the backwash mechanism section Y functions effectively to prevent the inconvenience described above from occurring.

That is, the motor 80 is activated and the backwash water pump 78 supplies the clean water in the casing 1 as backwash water into the inner cylinder member 62 of the backwash mechanism section Y via the backwash water supply pipe 75. To be done. The backwash water supplied into the inner cylinder member 62 is ejected to the inner surface side of the outer cylinder member 61 through the injection holes 63, 63, ..., However, since the inner cylinder member 62 is rotating, Only the backwash water ejected from the above-mentioned slit 64 formed in the close contact portion between the outer cylinder member 61 and the casing 1 and the superposed nozzle hole 63 is ejected as a jet WJ to the screening member 2 side through the slit 64, and the outer periphery of the mesh tube 21 is ejected. It acts so as to separate the contaminants sprayed on the surface and adhered to the mesh of the mesh tube 21 by the dynamic pressure and impact force.

In this case, the injection holes 63 on the inner cylinder member 62 side,
.. are sequentially superposed on the slit 64, so that the jet WJ jetted to the screening member 2 side through the slit 64 reciprocates along the slit 64. Therefore, due to the reciprocating movement of the jet WJ in the slit direction and the rotating operation of the screening member 2, for example, the mesh tube is not required to move the backwash water injection nozzle in the axial direction of the screening member 2 as in the conventional case. The entire area of 21 can be thoroughly washed by backwashing. That is, this will be described with reference to FIG. 4. In FIG. 4, the outer cylinder member 61 and the inner cylinder member 62 in the tubular state are shown.
And the trajectory of the jet WJ when the net tube 21 in the deployed state is assumed. In addition, here, when the inner cylinder member 62 makes one rotation, that is, at a pitch of the spiral line L, the range of the mesh tube 21 to be washed by the respective injection holes 63, 63, ... Stipulate.
Then, when the peripheral speed of the inner tubular member 62 is set to a non-integer multiple of the peripheral speed of the mesh pipe 21 (here, it is set to 13/3), the jet flow WJ is generated while the mesh pipe 21 makes one rotation. Mesh tube 21
Zigzag back and forth from point a _{1 to} point a ₁₀ , and
In the next one rotation, it reciprocates in a zigzag manner from point b _{1 to} point b ₁₀ , and in the next one rotation from point c _{1 to} point c ₁₀ , it is possible to finally clean the entire area of the mesh tube 21. .

On the other hand, when the backwash water is jetted from the injection hole 63 as in this embodiment, the jet WJ has a better convergence than, for example, the case where the backwash water is jetted from the jet nozzle. Since the jet WJ can be sprayed in a smaller range, its energy density is large,
It is possible to remove the contaminants from the mesh tube 21 more easily. Furthermore, since the jet WJ blown to the mesh tube 21 is intermittently jetted from the nozzle hole 63 formed by sequentially overlapping the slit 64, a larger impact force can be obtained as compared with the case where the jet is continuously jetted. This also improves the effect of removing contaminants. Further, in this case, at the lower end side of the slit 64, the jet WJ is blown through the water accumulated in the casing 1 and onto the net tube 21, so that the jet flow is caused by the resistance of the water.
Although it is possible that the impact force of WJ is reduced, in this embodiment, the screening member 2 is offset upward with respect to the casing 1 so that the inner cylinder member 62 and the screening member 2 are as close to each other as possible. By doing so, this effect is suppressed as much as possible.

As described above, in the filtering device Z of this embodiment, the jet WJ of the backwash water is screened by only rotating the inner cylinder member 62 inside the outer cylinder member 61 fixed to the casing 1. Since it is possible to sequentially move in the axial direction to clean the entire area, the structure can be simplified and the structure can be simplified as compared with the case of the structure that requires the reciprocating mechanism of the injection nozzle as in the related art. The cost can be reduced.

Further, in this embodiment, the mesh tube 21
Since the clean water filtered by is used as it is as backwash water, the amount of water load does not increase as in the case of separately preparing backwash water, and the operating cost can be expected to be reduced. It is a thing. In addition, since both the filtration mechanism section X and the backwash mechanism section Y have a closed structure, less odor is emitted to the outside than that of the open type using a conventional flat screen, for example. The effect on the surrounding environment is reduced and it can be said that it is a favorable environment type device. Furthermore, when inspecting the filtering device Z, the entire filtering device Z can be easily inspected by setting the filtering device Z in the inspection posture as shown by the chain line in FIG. 1, and the inspection workability is improved accordingly. It is a thing.

In this embodiment, the screening member 2 is composed of the mesh tube 21, but the present invention is not limited to this. For example, the screening member 2 is formed by winding a perforated plate into a cylindrical shape. It can also be rotated and configured.

[Brief description of drawings]

FIG. 1 is an explanatory view of the overall structure of a filtering device according to an embodiment of the present invention.

2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along the line III-III in FIG.

FIG. 4 is an explanatory view of backwashing action in the filtering device shown in FIG.

[Explanation of symbols]

1 is a casing, 2 is a screening member, 3 is a screw rod, 4 is a first spiral blade, 5 is a second spiral blade, 6 is clean water outlet, 7 is a mixture discharge port, 8 is a pipe end member, 9 is Raw water inlet, 10 drain outlet, 11
Is a pipe end member, 12 is a motor base, 13 is a motor, 14
Is a coupling, 15 is a drive gear, 16 is an intermediate gear, 1
7 is a driven gear, 21 is a mesh tube, 22 is an end member, 23 is a connecting bar, 24 and 25 are collars, 26 is a guide collar,
27 is an opening, 28 is a baffle plate, 31-33 are bearings, 34 and 35 are sealing materials, 41 is a first support leg, 4
2 is a second support leg, 43 and 44 are leg members, 45 is a bracket, 46 is a connecting pin, 47 and 48 are brackets, 4
Reference numerals 9 to 52 are connecting pins, 54 is a shaft member, 55 is an end plate, 56 is a motor, 57 is a speed reducer, 58 is a coupling, 61 is an outer cylinder member, 62 is an inner cylinder member, 63 is a nozzle hole, 6
4 is a slit, 65 and 66 are tube end members, and 67 and 6
8 is a bearing, 69 to 72 are sealing materials, 73 is a rotary joint, 74 is a connecting pipe, 75 is a backwash water supply pipe, 76 is a backwash water intake port, 77 is a suction pipe, 78 is a backwash water pump, 79
Is a coupling, 80 is a motor, 81 is a support frame,
X is a filtration mechanism part, Y is a backwash mechanism part, and Z is a filtration device.

Claims (1)

(57) [Scope of utility model registration request] 1. A tubular screening member configured to allow water to flow therein is disposed in a casing, is driven to rotate, and water to be filtered is introduced into an inner surface of the screening member. A filtering mechanism section for collecting contaminants such as dust in the water to be filtered on the inner surface side by circulating the screening member from the inner surface side to the outer surface side, and substantially on the outer peripheral surface of the casing of the filtering mechanism section. The fixing member is fixed in parallel with the casing and faces the screening member in the casing through a slit formed so as to radially penetrate the fixing portion and extend in the axial direction of the casing at the fixing portion. And a plurality of injection holes, which are inserted in the outer cylinder member so as to be rotatable relative to each other and are formed in a spiral shape at predetermined intervals on the outer peripheral wall thereof. Both of them are equipped with an inner cylinder member into which backwash water is introduced, and a backwash mechanism section provided with a drive means for rotating the inner cylinder member at a predetermined speed. .