JPH0518610U - Tubular filtration element - Google Patents

Abstract

(57) [Abstract] [Purpose] The tubular filtration element itself has a flexible structure that absorbs the bending stress applied to the tubular filtration element. Does not cause clogging. A tubular filter element comprising a tubular filter medium having a filter surface on its peripheral surface, one end of which is a sealed end and the other end of which is an open end, and a connecting mouthpiece is provided in the tubular filter element and the connecting mouthpiece. It is characterized in that the flexible metal tubular member 5 is interveningly joined to at least one portion of the tubular filter medium 2 or the intermediate portion of the tubular filter medium 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flexible metal tubular filtration element, and more particularly to a tubular filtration element suitable for filtration in the field of discharging high-concentration slurry cake.

[0002]

[Prior Art]

FIG. 3 shows a schematic view of a filtration tank using a tubular filtration element. In the figure, the filtration tank 13 is partitioned by a partition plate 16 into a stock solution chamber 14 below the filtration tank 13 and a filtration chamber 15 above the tank 13, and a plurality of through holes 17 are formed in the partition plate 16. The tubular filter elements 1b are fitted and hung in the through holes 17, respectively. Below the stock solution chamber 14, a stock solution introduction pipe 19 via a valve V ₄ and a discharge pipe 20 for discharging the residual liquid in the stock solution chamber 14 via a valve V ₅ and the cake accumulated on the surface of the filtration element 1b are arranged. is set, has been introduced pipe 23 of pressurized air is provided when the Hare line backwashing of the filter element 1b through valve V ₃ and more above the stock solution chamber 14. A conduit 18 is provided at the top of the filtrate chamber 15, and is connected to a conduit 18 communicating with the conduit 18 via a valve V ₁ and a filtrate outlet pipe 21 and a backwash fluid inlet pipe 22 for backwashing the filter element 1b. It is set up.

As the tubular filtration element 1b, for example, a fine slit formed by winding a stainless wire around the outer periphery of a stainless polygonal core tube having a large number of through holes on its peripheral surface at a required constant fine interval is filtered. The wound-type tubular filter medium having a surface or a porous sintered tubular filter medium made of stainless steel having fine holes of a predetermined size formed on the peripheral surface and having the fine holes as a filtering surface is used as the tubular filter medium 2. One end of each of these tubular filter media 2 is welded and sealed with a stainless stopper plug 4 and the other end is used as an open end. A stainless steel hollow tubular connection base 3 with a thread groove at the tip end is formed at this open end. Welded products are generally used. To attach these tubular filtration elements 1b to the partition plate 16 of the filtration tank, the connection mouthpiece 3 of the tubular filtration element 1b is fitted into the through hole 17 of the partition plate 16, and the nut 10 is inserted into the thread groove of the connection mouthpiece 3. It is performed by screwing and tightening.

Here, the filtration process and the backwashing process will be briefly described with reference to FIG. First, in the filtration process, with the backwash fluid introduction pipe valve V ₂ , the pressurized air introduction pipe valve V ₃ and the discharge pipe valve V ₅ closed, the stock solution introduction pipe valve V ₄ and the filtrate discharge pipe valve V ₁ are opened. The stock solution pressurized by a pump (not shown) is injected into the stock solution chamber 14 from the stock solution inlet pipe 19. The poured undiluted solution is filtered through the filter medium 2 of the tubular filtration element 1b, introduced into the filtrate chamber 15 from the open end of the tubular filtration element 1b, and passed through the conduit 18 at the top of the filtrate chamber 15 to the filtrate outlet pipe. It is taken out as a filtrate from 21. During this filtration step, the solid particles in the stock solution are deposited and deposited on the surface of the filter medium 2 of the tubular filtration element 1b as a filtration residue, that is, a cake. When the cake is deposited on the surface of the filter medium 2, the filtering ability is deteriorated, and therefore backwashing is performed to remove the cake. When performing backwashing, consideration should be given to the ease of post-treatment such as treatment after the cake accumulated on the surface of the filter medium 2 is discharged from the filter tank 13, that is, waste treatment or regeneration treatment for reusing the substance in the cake. Then, it is usually necessary to discharge the cake in the state of a high-concentration slurry in which the amount of liquid content in the cake is reduced as much as possible. In the backwash process there, after the filtration process is completed, the stock solution introduction pipe valve V ₄ is closed, and then the pressurized air introduction pipe valve V ₃ is first opened to send pressurized air from the pressurized air introduction pipe 23 into the stock solution chamber 14. . Most of the undiluted solution remaining in the undiluted solution chamber 14 is filtered by the pressurized air through the filter medium 2 and taken out from the filtered solution outlet pipe 21 as a filtrate. After this, the filtrate outlet pipe valve V ₁ is closed, the outlet pipe valve V ₅ is opened, and the residual liquid in the stock solution chamber 14 is discharged from the discharge pipe 20. At this time, since the pressure in the stock solution chamber 14 is higher than the pressure in the filtrate chamber 15 due to the pressurized air, only the liquid component is extracted from the cake deposited on the surface of the filter medium 2, and the cake is dried from the surface of the filter medium 2 in a dried state. It is retained without falling off. Next, the pressurized air introduction pipe valve V ₃ is closed and at the same time the backwash fluid introduction pipe valve V ₂ is opened, and a gas-liquid mixed phase fluid containing a small amount of water as a backwash fluid is added from the backwash fluid introduction pipe 22. Inject by pressure. The fed backwashing fluid is jetted from the inside of the tubular filter element 1b to the outside through the filter medium 2 through the filtrate chamber 15 and the open end of the tubular filter element 1b. As a result, the cake deposited on the surface of the filter medium 2 is peeled off from the surface of the filter medium 2 in the state of a high-concentration slurry containing only a small amount of water in the backflow fluid, and discharged from the discharge pipe 20 to the outside. .

However, since these tubular filtration elements 1b have a relatively long structure with a length of 1,400 mm, an outer diameter of 30 mm, and a thickness of the filter medium portion of 3 mm, the filter medium portion has a thin wall thickness, When an external force acts on the tubular filtration element 1b during the process or the backwashing process, this external force is easily concentrated on the joint A between the connection mouthpiece 3 having high rigidity and the tubular filter medium 2 having relatively low rigidity. For this reason, this stress causes the tubular filter element 1b to be bent and deformed at the joint A between the connection mouthpiece 3 and the tubular filter medium 2, or to cause a breakage accident at the joint A depending on the situation.

Therefore, in order to prevent the stress applied to the tubular filter element 1b from concentrating on the joint portion A between the connection mouthpiece 3 and the tubular filter medium 2, as shown in FIG. A stainless pin 9 having a diameter of about 6 mm was planted at the tip of the tube, while a steady rest 11 having a small hole 12 through which the pin 9 was inserted was provided in the stock solution chamber 14 of the filter tank 13. .. The tubular filtration element 1b is suspended from the partition plate 16 of the filtration tank 13 with the pin 9 inserted into the small hole 12 of the steady rest 11. Since the pin 9 of the tubular filtration element 1b is restrained by the small hole 12 of the steady rest member 11, the stress applied to the tubular filtration element 1b is dispersed without being concentrated in the joint A, and the tubular filtration element 1b. Bending deformation and breakage at the joint A were prevented.

[0007]

[Problems to be solved by the device]

 However, in the above-mentioned conventional tubular filtration element, when a large number of such tubular filtration elements are hung in the filtration tank, it is necessary to install the steady rests in the stock solution chamber of the filtration tank in a number corresponding to the number of tubular filtration elements. Becomes As a result, when the cake deposited on the surface of the tubular filtration element in the backwashing process is peeled off and dropped in a high-concentration slurry state, the peeled cake accumulates on the steady rest member, and cake clogging occurs in the filtration tank. It was causing harm.

[0008]

[Means for Solving the Problems]

 The present invention has been made in consideration of the above circumstances, and has a flexible structure in which the tubular filtering element itself absorbs the bending stress applied to the tubular filtering element, and the steady rest member used in the conventional element is eliminated. Accordingly, it is an object of the present invention to provide a tubular filtration element that does not cause clogging of a cake in a filtration tank even when a high-concentration slurry-like cake is backwashed and peeled off.

The above object is achieved by interposing a flexible metal tubular member at least at one portion of the joint between the tubular filter medium and the connection mouthpiece of the tubular filter element or the intermediate portion of the tubular filter medium.

[0010]

[Action]

 According to the present invention, since the flexible metal member is joined to at least one of the joining portion between the tubular filter element and the connecting mouthpiece of the tubular filtering element or the intermediate portion of the tubular filter element, bending stress is applied to the tubular filtering element. In this case, the bending stress is absorbed by the flexible metal tubular member, the bending stress is not concentrated on the joint between the tubular member and the connection mouthpiece, and the bending deformation generated at this joint, Trouble such as breakage is prevented. Therefore, it is necessary to install another steady rest inside the filtration tank to prevent bending deformation and breakage accident of the tubular filtration element, which was a cause of clogging in the filtration tank due to peeling cake during backwashing. Disappear.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. It should be noted that structural parts that overlap with the tubular filtration element of the conventional structure shown in FIG. 4 are assigned the same reference numerals as those in FIG. 4 and detailed explanations thereof are omitted. 1 and 2 are vertical cross-sectional views showing a state in which the tubular filter element of the present invention is suspended from a partition plate of a filter tank. In FIGS. 1 and 2, reference numeral 5 denotes a flexible metal tubular member, and as shown in FIGS. 1 (b) and 2 (b), a partially enlarged portion thereof, a helical shape is formed on the peripheral wall of the stainless steel tube. The corrugated flexible helical tube 6 is provided with a braided stainless thin wire 7 on the outer periphery, and stainless steel cylinders 8 and 8 are welded and fixed to both ends of the tube. The diameter of the flexible metal tubular member 5 is appropriately selected according to the diameter of the tubular filtration element 1a to be used. In the case of a tubular filtration element, a flexible metal tubular member having a length of 70 mm, an outer diameter of 30 mm and a wall thickness of 0.3 mm is used. The flexibility of the flexible metal tubular member 5 is obtained by the helically processed tube 6, and the braid 7 enhances the vibration damping property of the flexible metal tubular member 5 and The tube 6 is provided with a function of preventing axial elongation and deformation of the tube 6 by internal pressure or protecting external damage.

FIG. 1 shows a case where the flexible metal tubular member 5 having such a structure is placed and welded between the connection mouthpiece 3 and the tubular filter medium 2, and FIG. 2 shows that the tubular filter medium 2 is divided into two parts. It shows a case where the flexible metal tubular member 5 is placed and welded between the tubular filter media 2 and 2. According to other uses, the tubular filter medium 2 is divided into a plurality of pieces, and the flexible metal tubular member 5 is arranged between the respective divided tubular filter mediums 2, or between the connection mouthpiece 3 and the tubular filter medium 2 and a pipe. The flexible metal tubular member 5 may be arranged at two positions between the filter media 2. When suspending the tubular filtration element 1a of this embodiment in the filtration tank 13 of FIG. 3, the steady rest 11 used in the tubular filtration element 1b of the conventional structure is of course removed.

As a result of putting the tubular filtration element 1a of the above-described embodiment into practical use by using it as a filtration tank, the tubular filtration element 1a suffers from an accident such as bending deformation or breakage even if the filtration step and the backwashing step are repeated for a long period of time. There was nothing. Further, in the backwashing process, even when the high-concentration slurry-like cake deposited on the surface of the tubular filtration element 1a was peeled off, clogging of the cake did not occur in the filtration tank.

[0014]

[Effect of the device]

 As described above, according to the tubular filtration element of the present invention, even when the cake accumulated on the surface of the tubular filtration element is discharged in the high-concentration slurry state in the backwashing process, the cake falls off from the tubular filtration element surface. The inconvenience of clogging in the filtration tank due to the cake is eliminated, and the bending stress applied during the filtration process and backwash process does not cause bending deformation and breakage accidents in the tubular filtration element. The work efficiency of the backwash process can be significantly improved.

[Brief description of drawings]

FIG. 1 (a) is a vertical cross-sectional view of a tubular filtration element showing an embodiment of the present invention.

FIG. 1 (b) is a partially enlarged view of a flexible metal tubular member.

FIG. 2 (a) is a vertical cross-sectional view of a tubular filtration element showing another embodiment of the present invention.

FIG. 2B is a partially enlarged view of the flexible metal tubular member.

FIG. 3 shows a schematic view of a filtration tank using tubular filtration elements.

FIG. 4 is a vertical cross-sectional view of a tubular filtration element having a conventional structure.

[Explanation of symbols]

 1a Tubular Filtration Element 2 Tubular Filtration Material 3 Connection Base 4 Sealing Plug 5 Flexible Metal Tubular Member 6 Flexible Helical Tube 7 Braid 8 Cylinder

Claims (1)

[Scope of utility model registration request] 1. A tubular filter medium having a filtering surface composed of a large number of fine through holes or slits on its circumferential surface, the tubular filter medium having one end as a sealing end and the other end as an opening end, which is in communication with the opening end. In a tubular filtration element formed by joining a mouthpiece, a flexible metal tubular member is interveningly joined to at least one portion of a joining portion of the tubular filtering material and the connecting mouthpiece or an intermediate portion of the tubular filtering material. Tubular filtration element.