JP2512150Y2 - Filtration device - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a filtering device using a filter bag for liquid as a filtering material.

[Prior art]

As an industrial filtration device for filtering various liquids, a device using a cartridge filter has been conventionally used, but it is made of polypropylene microfiber or the like because it has a high pressure loss and a low particle retention amount. There is provided one using a filter bag formed of a non-woven fabric. A filtering device using this filter bag is disclosed in Japanese Patent Laid-Open No.
As shown in -37259 and JP-A-55-159818, the basket is placed in a closed cylindrical container, and the filter bag is held by the inner surface of the basket. The pressurized stock solution is introduced into the filter bag from the stock solution inlet, and the liquid passing through the filter bag is discharged from the filtrate outlet formed in the bottom of the container. This product has the advantages of high filtration performance, the filter bag can be easily replaced, and the inside of the container need not be cleaned when the filter bag is replaced.

[Problems to be solved by the device]

By the way, although the filter bag is used as a disposable item, if the filter bag is improved in filtration performance, clogging will occur quickly, the replacement cycle of the filter bag will be shortened, and the running cost will increase. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a filtering device capable of extending the replacement cycle of the filter bag and reducing the running cost.

[Means for Solving the Problems]

Therefore, the filtration device according to the present invention has a cylindrical container having a filtrate outlet in the lower part and having an open upper end, a lid for closing the upper end opening of the container, a basket arranged in the container, and a basket for the basket. It consists of a bag-shaped filter bag as a filter material placed inside and a mesh strainer as another filter material placed inside the filter bag, and the upper opening edge of the filter bag and the mesh strainer is the upper surface of the container. It has a first feature that it is clamped and fixed together between and a lid having a stock solution inlet,
Further, the mesh strainer arranged inside the filter bag has a plurality of mesh sizes different from each other arranged in a nest in order of mesh size, and the mesh strainer of the outermost layer and the filter bag are disposed between the container upper surface and the lid. The second feature is that the mesh strainer on the inner layer side is sandwiched and fixed by, and the opening edge is placed on the step portion formed at the upper end portion of the mesh strainer on the outermost layer. Furthermore, the third feature is that a mesh strainer having holes only on the bottom side is used as the mesh strainer, and a filter medium such as activated carbon is contained in the mesh strainer. [Operation] According to the present invention, in order to perform pre-filtration by the mesh strainer prior to filtration by the filter bag,
The filter bag can be prevented from clogging, and the mesh strainer is arranged inside the filter bag and the upper opening edge is clamped and fixed between the container and the lid like the filter bag. The work can be easily performed. Also, in the case where a plurality of mesh strainers with different mesh sizes are arranged in a nested order in the order of mesh size, the load on each mesh strainer is reduced,
It is possible to lengthen the cleaning cycle of these mesh strainers, and since the mesh strainer on the inner layer side is arranged by using the step formed on the mesh strainer of the outermost layer, the mesh strainers arranged at the same time The number and mesh size can be easily changed according to the stock solution. When a mesh strainer having holes formed only on the bottom side is used and a filter medium such as activated carbon is stored inside, it is possible to perform filtration with a filter medium such as activated carbon. [Embodiment] The present invention will be described in detail below with reference to the illustrated embodiment. As shown in FIG. 2, this filtration device has a cylindrical container 1 having a filtrate outlet 11 at a lower end surface thereof. A lid 2 for closing the upper end opening surface of the container 1, a basket 3 arranged in the container 1, a filter bag 4 arranged inside the basket 3, and a plurality arranged inside the filter bag 4. It consists of mesh strainers 51, 52 and 53.
Filter bag 4 which is the main filtering member here
Is made of polypropylene microfiber, and the container 1, the lid 2, the basket 3 and the mesh strainers 51, 52, 53 are usually made of stainless steel. In the figure, 16 is a supporting leg for supporting the container 1. The lid 2 has a horizontal axis at the rear side of the upper end of the container 1.
It is pivotally attached by 22 so that it can be rotated up and down, and has an inverted U-shaped bending tube 23 integrally provided on the upper surface, and one end of the stock solution inlet opening at the lower surface at the center of the lid 2. The other end of the bent pipe 23, which is 21, is fixed to the outer surface of the container 1 and connected to the upper end opening of an L-shaped connecting pipe 18 arranged below the shaft 22. An O-ring 24 is provided on the outer peripheral portion of the lower surface of the lid 2. Now, an eyebolt 25 whose upper end opening surface of the container 1 is covered with the lid 2 and one end of which is vertically rotatably connected to the outer peripheral portion of the container 1 is formed in the lid 2 with a groove 26 shown in FIG. Once tightened through, the O-ring 24 contacts the top surface of the container 1 and seals the top opening of the container 1. Reference numeral 27 in the figure is a connection port closed by a plug and is used for mounting a pressure gauge and a leak valve. The basket 3 is formed as a metal bottomed cylinder in which a large number of holes are formed, and a flange 31 is provided at the upper end thereof, as shown in FIG. 1, inside the opening of the container 1. By placing the collar 31 on the stepped portion 13 formed on the peripheral surface, the collar 31 is housed in the container 1 with a required space provided between the flange 31 and the inner peripheral surface of the container 1. The filter bag 4 arranged inside the basket 3 has the opening edge in which the wire ring 41 is sewn placed on the brim 31 of the basket 3 on the step 13.
It is housed in the basket 3 while being sandwiched between the stepped portion 13 and the lower surface of the lid 2. And a plurality, here three mesh strainers
The mesh sizes of 51, 52 and 53 are different from each other, and they are arranged inside the filter bag 4 in a nested state in the order of mesh sizes. For example, the mesh strainer 51 for the outermost layer has a mesh size of 50-100.
The innermost layer mesh strainer 53 having a mesh size of 200 to 500 μ is used, and the intermediate layer mesh strainer 52 having a mesh size of 100 to 200 μ is used. Further, these mesh strainers 51, 52, 53 are provided with flanges 54, 55, 56 at their upper ends, respectively, and are independent of each other.
While the rubber packing 58 is attached to 54, it is fixed by being sandwiched between the opening edge of the filter bag 4 and the lid 2, while the other mesh strainers 52, 53 are the outermost layers. The mesh strainer 51 is disposed by being stacked and mounted on the step 57 provided on the flange 54 of the mesh strainer 51. Thus, in this filtering device, the sealing of the joint between the lid 2 and the container 1 and the sealing of the opening edge of the filter bag 4 are performed.
Since it can be performed only by fixing the lid 2 to the container 1, it is easy to replace the filter bag 4 when the filter bag 4 is clogged, and the filter bag 4 and the mesh strainers 51, 52, 53 If the undiluted solution under pressure is fed from the undiluted solution inlet 21 to this filtration device equipped with, the undiluted solution is filtered from the coarse mesh strainer 53 of the mesh when passing through the finest filter bag 54 one by one, The liquid that has been subjected to the multistage filtration in this way is guided to the outside from the filtered liquid outlet 11. Since the mesh strainers 51, 52, 53 capture particles having a large particle size in advance, the absolute amount of particles that must be captured by the filter bag 4 is small. Therefore, the replacement cycle of the filter bag 4 is reduced. It can be lengthened and running cost can be reduced. And when the mesh strainers 51, 52, 53 are clogged, they have to be cleaned, but just like when replacing the filter bag 4, this can be done by simply opening the lid 2. In addition, since the mesh strainers 51, 52, 53 are independent of each other only by being nested, the cleaning work is easy and the time required is short. Also, each mesh size in the mesh strainer 51, 52, 53,
It is possible to adopt a combination of the most suitable ones for the stock solutions to be filtered, and it is also possible to clean only the clogging mesh strainer. Although three mesh strainers 51, 52, 53 are used here, the number can be changed as appropriate.
In particular, since the mesh strainers 52, 53 on the inner layer side are arranged by utilizing the step portion 57 of the flange 54 of the mesh strainer 51 on the outermost layer as described above, the number of mesh strainers to be used is equal to that of the lid 2 There is no influence on the sealing of the container 1 by the above, and it is possible to easily deal with adding a mesh strainer to a filtration device that does not use a mesh strainer. When performing filtration with a filter medium such as activated carbon, replace the mesh strainer 53 in the inner side of a plurality of mesh strainers or the innermost mesh strainer, that is, the mesh strainer 53 in the one shown in FIG. As shown in Fig. 4, punching holes are provided only at the bottom.
A mesh strainer 7 provided with 70 and a filter material 8 such as activated carbon disposed on the bottom may be installed. In this case, the liquid that passes through the punching holes 70 at the bottom of the mesh strainer 7 is always filtered by the filter medium 8 such as activated carbon, and the liquid that has passed through the punching holes 70 of the mesh strainer 7 is Since it is pressurized, it spreads in the space between the mesh strainer 7 and the basket 3,
It passes through 52, 51 and the filter bag 4.

[Effect of device]

As described above, in the present invention, the mesh strainer can perform the pre-filtration before the filtration by the filter bag, and the multi-stage filtration can be performed by the single filtration device. The clogging can be suppressed and the replacement cycle can be lengthened, the running cost can be reduced, and the installation space can be reduced as compared with the case where multiple filtration devices are combined to perform multistage filtration. it can. Moreover, since the filter bag and the mesh strainer arranged inside the filter bag have the upper opening edge clamped and fixed between the container and the lid, the mesh strainer can be easily cleaned. Even though the mesh strainer is arranged inside, the replacement work of the filter bag can be easily performed. Also, in the case where a plurality of mesh strainers with different mesh sizes are arranged in a nested order in the order of mesh size, the load on each mesh strainer is reduced,
It is possible to lengthen the cleaning cycle of these mesh strainers, and since the mesh strainer on the inner layer side is arranged by using the step formed on the mesh strainer of the outermost layer, the mesh strainers arranged at the same time The number and mesh size can be easily changed according to the stock solution. Furthermore, as the mesh strainer, one in which a hole is opened only on the bottom side is used and a filter medium such as activated carbon is stored inside the mesh strainer, it is possible to perform filtration with a filter medium such as activated carbon. At this time, the mesh strainer can function as a device for preventing the filtering material from flowing out to the filter bag side.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged sectional view of an embodiment of the present invention, FIG. 2 is a cutaway front view of the same, FIG. 3 is a plan view of the same, and FIG. 4 is an enlarged sectional view of another example. In the figure, 1 is a container, 2 is a lid, 3 is a basket, 4 is a filter bag, 11 is a filtrate outlet, 21 is a stock inlet, and 7, 51, 52 and 53 are mesh strainers.

Claims (3)

(57) [Scope of utility model registration request] 1. A cylindrical container having a filtrate outlet in the lower part and having an upper end opened, a lid for closing the upper end opening of the container, a basket arranged in the container, and a basket arranged inside the basket. It consists of a bag-shaped filter bag as a filtering material and a mesh strainer as another filtering material arranged inside the filter bag.The upper opening edge of the filter bag and the mesh strainer is the upper surface of the container and the stock solution inlet. A filter device that is sandwiched and fixed together with a lid provided. 2. A mesh strainer arranged inside a filter bag is formed by nesting a plurality of mesh sizes different from each other in the order of mesh size, and the mesh strainer of the outermost layer and the filter bag are provided on a container upper surface and a lid. 2. The mesh strainer on the inner layer side is sandwiched and fixed between the mesh strainer and the mesh strainer, and the opening edge is placed on the step formed on the upper end of the mesh strainer on the outermost layer. The described filtering device. 3. A mesh strainer having holes formed only on the bottom side is used as the mesh strainer, and a filter medium such as activated carbon is contained in the mesh strainer. The described filtering device.