Tubular ultrafiltration filter

Abstract

The utility model discloses a tubular ultrafiltration filter which comprises a tubular shell, an ultrafiltration membrane component arranged in the shell and end covers arranged at two ends of the shell, the ultrafiltration membrane component comprises two end sockets and at least one tubular ultrafiltration membrane arranged between the two end sockets, the two end sockets are respectively arranged at two ends of the shell in a sealing manner, and the tubular ultrafiltration membrane is arranged between the two end sockets. Each tubular ultrafiltration membrane is arranged along the axial direction of the shell, at least one filtrate interface is formed in the side wall of the shell, and a liquid inlet interface is formed in each end cover. According to the utility model, feed liquid is simultaneously introduced into the two liquid inlet connectors, so that the feed liquid axially flows in the inner cavity of the tubular ultrafiltration membrane and forms turbulent flow at the junction, substances deposited on the surface of the tubular ultrafiltration membrane can be taken away, the increase speed of filtration resistance is slowed down, and polarization concentration and membrane pollution are effectively avoided; and meanwhile, the material liquid has a higher flow rate after being converged, so that the material liquid vertically flows through the membrane surface of the tubular ultrafiltration membrane at a high speed, the membrane flux of the tubular ultrafiltration membrane is improved, and the filtering efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrafiltration equipment, and more specifically, to a tubular ultrafiltration filter. Background Art

[0002] Ultrafiltration is a pressurized membrane separation technology, that is, under a certain pressure, small molecular solutes and solvents are allowed to pass through a special membrane with a certain pore size, while large molecular solutes cannot pass through and remain on one side of the membrane, thereby partially purifying the large molecular substances. Ultrafiltration is one of the membrane separation technologies that uses pressure as a driving force, and its purpose is to separate large molecules from small molecules.

[0003] At present, the most commonly used ultrafiltration filter on the market is the plate-type TFF filter, that is, the feed liquid flows parallel to the membrane surface, and the permeate passes through the membrane vertically. The material deposited on the membrane surface is taken away by the tangential high-speed flow of the feed liquid, thereby slowing down the growth rate of the filtration resistance; but due to the tangential high-speed flow of the feed liquid on the membrane surface, only a small part of the liquid passes through the membrane, resulting in low filtration efficiency.

[0004] Therefore, it is necessary to propose a new solution to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and to provide a tubular ultrafiltration filter. By simultaneously introducing feed liquid into two liquid inlet interfaces, the feed liquid flows axially in the inner cavity of the tubular ultrafiltration membrane and forms turbulence at the intersection, which can not only take away the substances deposited on the surface of the tubular ultrafiltration membrane, but also slow down the growth rate of the filtration resistance and effectively avoid polarization concentration difference and membrane pollution. At the same time, the feed liquid has a higher flow rate after the intersection, so that the feed liquid flows vertically and at high speed through the membrane surface of the tubular ultrafiltration membrane, thereby improving the membrane flux of the tubular ultrafiltration membrane and improving the filtration efficiency.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A tubular ultrafiltration filter comprises a tubular shell, an ultrafiltration membrane assembly arranged in the shell, and end covers arranged at both ends of the shell, the ultrafiltration membrane assembly comprises two heads and at least one tubular ultrafiltration membrane arranged between the two heads, the two heads are respectively sealed and installed at the two ends of the shell, each of the tubular ultrafiltration membranes is arranged axially along the shell, at least one filtrate interface is provided on the side wall of the shell, and each of the end covers is provided with a liquid inlet interface.

[0008] Furthermore, the tubular ultrafiltration membrane is a tubular structure formed by welding the ultrafiltration membrane after it is wound into a roll.

[0009] Furthermore, at least two filtrate interfaces are provided, and the filtrate interfaces are respectively located on the side walls on both sides of the shell with the axis of the shell as the center line.

[0010] Furthermore, the two ends of the tubular ultrafiltration membrane are respectively installed on the two heads through interference fit, and after the tubular ultrafiltration membrane passes through the head, the end portion thereof is flush with the outer surface of the head.

[0011] Furthermore, the tubular ultrafiltration membrane is covered with a tubular screen, and both ends of the tubular ultrafiltration membrane are flush with both ends of the screen respectively. Both ends of the tubular ultrafiltration membrane are coated with epoxy glue and fixed to the screen by the epoxy glue.

[0012] Furthermore, the two end covers are respectively and hermetically mounted on the two ends of the shell.

[0013] Furthermore, the pressure range of the liquid introduced into the liquid inlet interface is 0.15-0.25 MPa.

[0014] Furthermore, the shell is a PP shell, and the end cover is a PP end cover.

[0015] The beneficial effects of the utility model are:

[0016] 1. In the utility model, by simultaneously introducing feed liquid into two liquid inlet interfaces, the feed liquid is made to flow axially in the inner cavity of the tubular ultrafiltration membrane and form turbulence at the intersection, which can not only take away the substances deposited on the surface of the tubular ultrafiltration membrane, but also slow down the growth rate of the filtration resistance and effectively avoid polarization concentration difference and membrane pollution, but also the feed liquid has a higher flow rate after the intersection, so that the feed liquid flows vertically and at high speed through the membrane surface of the tubular ultrafiltration membrane, thereby improving the membrane flux of the tubular ultrafiltration membrane and improving the filtration efficiency.

[0017] 2. In the utility model, multiple filtrate interfaces are arranged to shorten the filtrate discharge stroke, so that the filtrate can be quickly discharged from both sides of the shell, respectively, to prevent the filtrate from accumulating in the area between the inner wall of the shell and the outer wall of the tubular ultrafiltration membrane, thereby affecting the flow rate of the feed liquid passing through the tubular ultrafiltration membrane, thereby improving the filtration efficiency.

[0018] 3. In the present invention, the screen can be arranged to support the ultrafiltration membrane, thereby preventing the tubular ultrafiltration membrane from being deformed under the filtration pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a tubular ultrafiltration filter in this embodiment;

[0020] Figure 2 A schematic cross-sectional view of the tubular ultrafiltration filter in this embodiment;

[0021] Figure 3 This is a schematic diagram of an exploded structure of a tubular ultrafiltration filter in this embodiment;

[0022] Figure 4Schematic diagram of a connection structure between a tubular ultrafiltration membrane and a screen in this embodiment.

[0023] Reference numerals: housing 1 , ultrafiltration membrane assembly 2 , head 201 , tubular ultrafiltration membrane 202 , screen 203 , end cover 3 , filtrate interface 4 , liquid inlet interface 5 . DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Embodiment: A tubular ultrafiltration filter, such as Figure 1-Figure 4 As shown, it includes a shell 1, an ultrafiltration membrane assembly 2 arranged in the shell 1, and end covers 3 arranged at both ends of the shell 1. The shell 1 is a tubular structure with open ends and a hollow interior. The ultrafiltration membrane assembly 2 includes two heads 201 and a tubular ultrafiltration membrane 202 arranged between the two heads 201. The two heads 201 are respectively sealed and installed at both ends of the shell 1. The tubular ultrafiltration membrane 202 is a tubular structure formed by welding a planar ultrafiltration membrane wound into a roll. At least one tubular ultrafiltration membrane 202 is provided, and each tubular ultrafiltration membrane 202 is axially arranged along the shell 1, that is, both ends of the tubular ultrafiltration membrane 202 extend to both ends of the shell 1 respectively. At least one filtrate interface 4 is provided on the side wall of the shell 1, and the filtrate interface 4 is connected to the inner cavity of the shell 1. Each end cover 3 is provided with a liquid inlet interface 5, and the liquid inlet interface 5 is connected to the inner cavity of the corresponding end cover 3.

[0026] When in use, the feed liquid is introduced into the two liquid inlet interfaces 5 at the same time, and the feed liquid is introduced into the inner cavity of the tubular ultrafiltration membrane 202 through the inner cavity of the end cover 3. The feed liquid passes through the tubular ultrafiltration membrane 202 to form a filtrate, and the filtrate flows to the area between the inner wall of the shell 1 and the outer wall of the tubular ultrafiltration membrane 202, and is discharged through the filtrate interface 4. Since the feed liquid flows axially along the tubular ultrafiltration membrane 202 in the inner cavity of the tubular ultrafiltration membrane 202, a tangential flow is formed between the feed liquid and the membrane surface of the tubular ultrafiltration membrane 202, which can carry away the substances deposited on the surface of the tubular ultrafiltration membrane 202, slow down the growth rate of the filtration resistance, and effectively avoid polarization concentration and membrane pollution; and, for the same tubular ultrafiltration membrane 202, since the feed liquid is introduced from both ends of the tubular ultrafiltration membrane 202 at the same time, the two streams of feed liquid are intersected to form turbulence, and have a high flow rate, so that the feed liquid flows vertically and at high speed through the membrane surface of the tubular ultrafiltration membrane 202, thereby improving the membrane flux of the tubular ultrafiltration membrane 202 and the filtration efficiency, and is suitable for feed liquid filtration with a pressure range of 0.15-0.25mpa and pressure-sensitive feed liquid.

[0027] At the same time, due to the sealed connection between the head 201 and the shell 1, if the head 201 is installed at both ends of the shell 1 by interference fit, the feed liquid is isolated from the filtrate, ensuring the cleanliness of the filtrate.

[0028] Preferably, two or more filtrate interfaces 4 are provided, and the filtrate interfaces 4 are respectively located on the side walls of both sides of the housing 1 with the axis of the housing 1 as the center line. With the above arrangement, the filtrate discharge stroke is shortened, so that the filtrate can be quickly discharged from both sides of the housing 1, respectively, and the filtrate is prevented from accumulating in the area between the inner wall of the housing 1 and the outer wall of the tubular ultrafiltration membrane 202, which affects the flow rate of the feed liquid passing through the tubular ultrafiltration membrane 202, thereby improving the filtration efficiency.

[0029] Furthermore, the two ends of the tubular ultrafiltration membrane 202 are respectively installed on the two heads 201 by interference fit, and the ends of the tubular ultrafiltration membrane 202 are flush with the outer surface of the head 201 after passing through the head 201. The tubular ultrafiltration membrane 202 and the head 201 are sealed and connected by interference fit, so that the feed liquid is isolated from the filtrate to ensure the cleanliness of the filtrate; the tubular ultrafiltration membrane 202 and the head 201 are arranged flush, so that the feed liquid can be quickly introduced into the inner cavity of the tubular ultrafiltration membrane 202 to avoid affecting its flow rate.

[0030] The tubular ultrafiltration membrane 202 is covered with a tubular screen 203, and the two ends of the tubular ultrafiltration membrane 202 are respectively flush with the two ends of the screen 203. The two ends of the tubular ultrafiltration membrane 202 are coated with epoxy glue and fixed to the screen 203 by the epoxy glue. The screen 203 can form a support for the ultrafiltration membrane to prevent the tubular ultrafiltration membrane 202 from deforming under the filtration pressure.

[0031] Furthermore, the two end covers 3 are respectively installed at the two ends of the shell 1 in a sealing manner. For example, the end covers 3 are installed at the two ends of the shell 1 by using interference fit to prevent the liquid from leaking from the connection between the end covers 3 and the shell 1 .

[0032] Furthermore, both the shell 1 and the end cover 3 are made of PP material. On the one hand, it has corrosion resistance and a certain hardness, thereby achieving the effect of increasing the service life; on the other hand, it has a certain deformation ability to facilitate interference fit installation between the end cover 3 and the shell 1, thereby achieving the effect of improving the sealing.

[0033] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A tubular ultrafiltration filter, comprising a tubular housing (1), an ultrafiltration membrane assembly (2) arranged in the housing (1), and end caps (3) arranged at both ends of the housing (1), characterized in that: The ultrafiltration membrane assembly (2) comprises two sealing heads (201) and at least one tubular ultrafiltration membrane (202) arranged between the two sealing heads (201), the two sealing heads (201) are respectively sealed and installed at two ends of the shell (1), each tubular ultrafiltration membrane (202) is arranged axially along the shell (1), at least one filtrate interface (4) is provided on the side wall of the shell (1), and each end cover (3) is provided with a liquid inlet interface (5).

2. A tubular ultrafiltration filter according to claim 1, characterized in that: The tubular ultrafiltration membrane (202) is a tubular structure formed by welding the ultrafiltration membrane after it is wound into a roll.

3. A tubular ultrafiltration filter according to claim 1, characterized in that: At least two filtrate interfaces (4) are provided, and the filtrate interfaces (4) are respectively located on the side walls of both sides of the shell (1) with the axis of the shell (1) as the center line.

4. The tubular ultrafiltration filter according to claim 1, characterized in that: The two ends of the tubular ultrafiltration membrane (202) are respectively mounted on the two sealing heads (201) by interference fit, and after the tubular ultrafiltration membrane (202) passes through the sealing heads (201), the ends thereof are flush with the outer surface of the sealing heads (201).

5. A tubular ultrafiltration filter according to claim 4, characterized in that: The tubular ultrafiltration membrane (202) is covered with a tubular screen (203), and the two ends of the tubular ultrafiltration membrane (202) are respectively flush with the two ends of the screen (203). The two ends of the tubular ultrafiltration membrane (202) are coated with epoxy glue and fixed to the screen (203) by the epoxy glue.

6. The tubular ultrafiltration filter according to claim 1, characterized in that: The two end covers (3) are respectively installed in a sealing manner at the two ends of the shell (1).

7. The tubular ultrafiltration filter according to claim 1, characterized in that: The pressure range of the liquid introduced into the liquid inlet interface (5) is 0.15-0.25 MPa.

8. The tubular ultrafiltration filter according to claim 1, characterized in that: The shell (1) is a PP shell, and the end cover (3) is a PP end cover.

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