CN107551826B - Apparatus for manufacturing an asymmetrical tubular filter element blank - Google Patents
Apparatus for manufacturing an asymmetrical tubular filter element blank Download PDFInfo
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- CN107551826B CN107551826B CN201710637698.1A CN201710637698A CN107551826B CN 107551826 B CN107551826 B CN 107551826B CN 201710637698 A CN201710637698 A CN 201710637698A CN 107551826 B CN107551826 B CN 107551826B
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Abstract
The application discloses manufacturing equipment of an asymmetric tubular filter element blank, which comprises a tubular and porous support body and a coating layer positioned on the inner wall of the support body, wherein the coating layer is formed by adhering slurry to the inner wall of the support body through drying, and the manufacturing equipment comprises a sealing part, a grouting mechanism and a driving assembly for driving the support body to rotate in the horizontal direction; the sealing part comprises a first sealing part and a second sealing part which are matched with the two ends of the supporting body respectively; the grouting mechanism comprises a slurry circulation channel which is arranged on the first sealing part and/or the second sealing part and enables the inside and the outside of the support body to be communicated; the driving assembly comprises a rotating shaft connected with the first sealing part and the second sealing part and a motor for driving the rotating shaft to rotate. The application integrates grouting and centrifugation, can prepare a coating with uniform thickness and has high production efficiency.
Description
Technical Field
The application relates to the technical field of asymmetric tubular filter elements, in particular to equipment for manufacturing an asymmetric tubular filter element blank.
Background
The asymmetric tubular filter element refers to an asymmetric tubular filter element in which the filter pore size varies in a gradient in the filtering direction. The pore diameter of the asymmetric tubular filter element increases or decreases sequentially from inside to outside along the radial direction. Wherein, for the asymmetric tubular filter element with sequentially increased pore diameters, the inner layer structure is called an inner membrane, and the outer layer structure is called a support; for the asymmetric tubular filter element with sequentially decreasing pore diameters, the inner layer structure is called a support body, and the outer layer structure is called an outer membrane; the inner and outer films may be collectively referred to as a film layer.
For asymmetric tubular filter elements with a membrane layer prepared by powder metallurgy, the following steps are generally included: 1) Attaching slurry (prepared by adding film powder into a dispersing agent) on the surface of a support, and drying to form a coating; 2) The support to which the slurry is attached is subjected to secondary sintering to convert the coating into an inner film or an outer film (film layer). Currently, the main preparation process of the adhesion slurry is spraying or dipping.
Spraying is easy to understand, and although spraying is easy to form an inner film or an outer film independently, the surface of the final film layer is uneven due to difficulty in forming a coating layer with uniform thickness, and cracks are easy to generate during sintering and filtering or the pore diameter of the film layer is uneven.
The impregnation is accompanied by special equipment to prevent the outer part of the support from being applied with a paste when preparing the inner film or the inner part of the support from being applied with a paste when preparing the outer film. For example, the following methods are mainly used for preparing the inner membrane: preparing a certain volume of slurry, pouring the slurry into a tubular membrane immersing tool, immersing the outer surface of the support body into the slurry in a sealing way, and adsorbing a certain amount of slurry on the inner surface of the support body after a certain time. The membrane dipping process is complex in operation process, slurry attached to the surface of the support body flows downwards after the membrane dipping process is finished, a channel flow mark is formed on the inner surface of the support body, the thickness of a membrane layer is uneven, cracks are generated during sintering, and the pore diameter of an inner membrane is uneven.
Disclosure of Invention
The application mainly aims to provide a manufacturing method and manufacturing equipment of an asymmetric tubular filter element blank body, so as to solve the problems of uneven film thickness and pore diameter distribution and cracks of the asymmetric tubular filter element in the prior art. Also, a method and apparatus for manufacturing an asymmetric tubular filter element are provided to produce an asymmetric tubular filter element having excellent properties.
In order to achieve the above object, according to one aspect of the present application, there is provided a method of manufacturing an asymmetric tubular filter element blank. The asymmetric tubular filter element blank comprises a tubular and porous support body and a coating layer positioned on the inner wall of the support body, wherein the coating layer is formed by drying slurry attached to the inner wall of the support body, and the manufacturing method of the asymmetric tubular filter element blank comprises the following steps:
1) And (3) obtaining a support and slurry: the slurry comprises first raw material powder and a dispersing agent; the aperture of the support body is 1-3 times of the particle size of the first raw material powder;
2) Grouting: injecting the slurry into the support;
3) Preparing the coating: the support body is placed upside down, two ends of the support body are sealed, the support body is rotated in the horizontal direction, so that first raw material powder in slurry injected into the support body is attached to the inner wall of the support body under the centrifugal action, and dispersing agents in the injected slurry penetrate through the pipe wall of the support body under the centrifugal action, and a precursor of the asymmetric tubular filter element blank body is obtained;
4) And (3) drying: drying the precursor to obtain the asymmetric tubular filter element blank.
The reverse placement means that the central axis of the support body is parallel to the horizontal plane; the phrase "rotating the support in the horizontal direction" means that a rotation axis of the support is parallel to the central axis; the method of manufacturing an asymmetrical tubular filter element blank according to the application, which for the first time envisages the application of a centrifugal principle to the attachment of the slurry, may bring about the following advantages:
1) Under the action of centrifugal force, the first raw material powder moves towards the support body, so that the first raw material powder is in close contact with the support body, the binding force between the sintered film layer and the support body can be improved, and the film layer is not easy to fall off; meanwhile, in the traditional preparation method, the asymmetric tubular filter element blank is required to be pressed after being dried so as to improve the density of the first raw material powder, and the first raw material powder in the asymmetric tubular filter element blank prepared by the preparation method is piled up more densely, because the pressing filtration can be omitted or the pressing time or the pressing force can be reduced;
2) The first raw material powder in the slurry has different sizes and different centrifugal forces, the first raw material powder with larger particle size is subjected to a large centrifugal force and reaches the surface of the support body first, the first raw material powder with smaller particle size is subjected to a small centrifugal force and then reaches the surface of the support body, so that the coating has a layered powder layer structure, each layer has the first raw material powder with basically consistent particle size, and the film layer obtained by sintering the coating has uniform pore diameter and smooth and flat surface;
3) The dispersing agent is thrown out through the pipe wall of the supporting body under the action of centrifugal force, so that the drying time is shortened, the sintering time is shortened, the stress concentration generated during the sintering of the first raw material powder is reduced, and cracks and pinholes generated in the film layer are avoided;
4) The support body rotates in the horizontal direction under the centrifugal action, so that the contact time between each part in the support body and the slurry is the same, the thickness of the coating is uniformly distributed, a channel flow mark is not formed on the inner surface of the support body, and the quality of the obtained film layer is higher;
5) The slurry introduced into the support body can be completely converted into a coating, so that the thickness of the coating can be controlled by controlling the addition amount of the slurry; however, the thickness of the coating is difficult to be precisely controlled by the traditional method for attaching the slurry;
6) Because the pore distribution of the support body is tortuous, the first raw material powder in the slurry is difficult to pass through the pipe wall of the support body so as to be thrown out; however, if the particle size of the first raw material powder is larger, the first raw material powder is difficult to partially enter the pores of the support body, so that the binding force between the film layer and the support body is poor, and the film layer is easy to fall off; therefore, in order to further ensure that the first raw material powder is not thrown out and that the binding force of the film layer and the support body is stronger, the pore diameter of the support body is preferably 1 to 3 times the particle diameter of the first raw material powder; preferably, the pore diameter of the support is 1.8-2.5 times of the particle diameter of the first raw material powder;
7) Only the slurry corresponding to the coating with the required thickness is injected each time, and the slurry is not required to be recycled like the slurry attached by an impregnation method; meanwhile, a coating with uniform thickness can be rapidly formed, and the production efficiency is remarkably improved.
Further, the pipe wall thickness of the support body is 1-6 mm; the inner diameter of the support body is 20-100 mm; the thickness of the coating is 0.01-2 mm. Since the support body is subjected to centrifugal action, in order to prevent deformation of the support body, the support body needs to have a certain thickness and inner diameter to obtain a proper rigidity. And the pore diameter of the membrane layer is smaller, so that when the thickness of the coating is 0.01-2 mm, the membrane layer obtained by sintering can reduce the filtration pressure on the premise of keeping a better filtration effect. Preferably, the pipe wall thickness of the support body is 2-4 mm; the inner diameter of the support body is 30-75 mm; the thickness of the coating is 0.05-1 mm.
Further, the rotating speed of the support body is 100-500 r/min, and the rotating time is 2-20 min. If the rotation speed is too slow, the efficiency is too low; if the rotation speed is too high, the dispersant may be thrown out rapidly, so that the first raw material powder is not uniformly distributed, and high requirements on rigidity of the support body are also met. Preferably, the rotating speed of the support body is 200-300 r/min, and the rotating time is 5-15 min.
Further, the preparation of the support body comprises the following steps: 1) Preparing second raw material powder, and pressing the second raw material powder into a support precursor, wherein the support precursor has the shape of the support; 2) Sintering the support precursor to obtain the support. The support body and the membrane layer are both made of sintered metal porous materials or sintered ceramic porous materials, so that the support body can bear high temperature in the sintering process of the coating, and can form metallurgical bonding with the membrane layer in the sintering process of the coating, and the bonding force is stronger; the precursor of the support body is formed by directly pressing the second raw material powder, the support body is easy to have better rigidity, and the thickness of the support body can be reduced on the premise of bearing higher centrifugal force.
Further, the device adopted by the method comprises a sealing part, a grouting mechanism and a driving assembly for driving the support body to rotate in the horizontal direction; the sealing part comprises a first sealing part and a second sealing part which are matched with the two ends of the supporting body respectively; the grouting mechanism comprises a slurry circulation channel which is arranged on the first sealing part and/or the second sealing part and enables the inside and the outside of the support body to be communicated; the driving assembly comprises a rotating shaft connected with the first sealing part and the second sealing part and a motor for driving the rotating shaft to rotate. Therefore, the device has a simple structure, integrates grouting and centrifugation, and can remarkably improve the production efficiency.
In order to achieve the above object, according to another aspect of the present application, there is also provided a method of manufacturing an asymmetric tubular filter element. The method of making an asymmetric tubular filter element comprises the steps of:
1) Preparing an asymmetric tubular filter element blank by adopting the manufacturing method of the asymmetric tubular filter element blank;
2) Sintering the asymmetrical tubular filter element blank body to convert the coating in the asymmetrical tubular filter element blank body into a film layer with a filtering function, and obtaining the asymmetrical tubular filter element.
The asymmetric tubular filter element blank prepared by the method for manufacturing the asymmetric tubular filter element blank is sintered to obtain the asymmetric tubular filter element, and the thickness and pore size of the membrane layer are uniformly distributed, so that cracks and pinholes are not generated. The membrane layer is an inner membrane.
Further, the support and the membrane layer are composed of a sintered metal porous material or a sintered ceramic porous material having affinity of the same kind. Thus, detachment between the support and the film layer due to material difference can be ensured.
Further, the particle size of the first raw material powder is 1-12 mu m; the second raw material powder has a particle size of-200 to +400 meshes. Thus, the pore diameter of the support body can be easily matched with the particle diameter of the first raw material powder, and an asymmetric tubular filter element with a proper pore diameter can be obtained.
In order to achieve the above object, according to another aspect of the present application, there is also provided an apparatus for manufacturing an asymmetric tubular filter element blank including a tubular and porous support body and a coating layer on an inner wall of the support body, the coating layer being dried by attaching slurry to the inner wall of the support body, the apparatus including a sealing portion, a grouting mechanism, and a driving assembly driving the support body to rotate in a horizontal direction; the sealing part comprises a first sealing part and a second sealing part which are matched with the two ends of the supporting body respectively; the grouting mechanism comprises a slurry circulation channel which is arranged on the first sealing part and/or the second sealing part and enables the inside and the outside of the support body to be communicated; the driving assembly comprises a rotating shaft connected with the first sealing part and the second sealing part and a motor for driving the rotating shaft to rotate.
When the coating production device is used, the slurry for producing the coating is injected into the support body from the slurry circulation channel, and then the motor is started to enable the rotating shaft to rotate, so that the support body can rotate. Therefore, the manufacturing equipment of the asymmetric tubular filter element blank body has a simple structure, integrates grouting and centrifugation, can prepare a coating with uniform thickness, and can remarkably improve the production efficiency.
The relative positional relationship between the grouting mechanism and the driving assembly can be three types:
first, the pivot does not coincide with thick liquids circulation passageway, needs to set up two holes on first sealing portion and/or second sealing portion promptly, at this moment, slip casting mechanism should still include with the first end cap of thick liquids circulation passageway matching, because the pivot does not participate in slip casting, therefore the pivot can be solid structure. Thereby, the slurry is prevented from being thrown out of the slurry flow channel during centrifugation.
Second, the pivot includes and passes the thick liquids circulation passageway supplies the hollow tubular part that thick liquids flow, slip casting mechanism still including locate be located on the inside hollow tubular part of support with the inside play thick liquid hole that switches on of support and locate be located on the outside hollow tubular part of support. Therefore, before rotation, the paddle body is distributed more uniformly at the bottom of the support body, and a coating with more uniform thickness is obtained.
Third, the pivot includes the hollow tubular portion that passes the confession thick liquids flow of thick liquids circulation passageway, slip casting mechanism still includes locate on the inside hollow tubular portion of supporter with the grout outlet that the supporter is inside switches on and locate the slip casting hole on the outside hollow tubular portion of supporter. Therefore, only one hole is formed in the sealing part, even if the rotating shaft is overlapped with the slurry circulation channel, the structure is more compact, and the sealing effect is better.
Further, the grouting mechanism further comprises a second plug matched with the grouting hole. Thereby, the slurry is prevented from being thrown out of the grouting holes during centrifugation.
Further, the second plug is in threaded connection with the grouting hole. Because the rotating shaft is generally made of metal, the second plug is in threaded connection with the grouting hole, so that the connection is firmer and sealed.
Further, the material of the first sealing part and/or the second sealing part is elastic material. Therefore, the sealing device is easy to obtain and good in sealing effect.
Further, the device also comprises a positioning mechanism for positioning the rotating shaft. Therefore, the support body is more stable in the rotating process.
Further, the box body is provided with a rotating hole matched with the rotating shaft. Thereby, the dispersant is recovered while preventing the dispersant from splashing.
Further, the pipe wall thickness of the support body is 1-6 mm; the inner diameter of the support body is 20-100 mm; the thickness of the coating is 0.01-2 mm. Since the support body is subject to centrifugal action, the support body needs to have a certain thickness and inner diameter in order to prevent the support body from being deformed. The pore diameter of the membrane layer is smaller, so that when the thickness of the coating is 0.01-2 mm, the membrane layer obtained by sintering the coating can reduce the filtration pressure on the premise of keeping a better filtration effect. Preferably, the pipe wall thickness of the support body is 2-4 mm; the inner diameter of the support body is 30-75 mm; the thickness of the coating is 0.05-1 mm.
In order to achieve the above object, according to another aspect of the present application, there is also provided an apparatus for manufacturing an asymmetric tubular filter element, which is sintered from an asymmetric tubular filter element blank, the manufacturing apparatus including an apparatus for manufacturing the asymmetric tubular filter element blank, an apparatus for drying the asymmetric tubular filter element blank, and an apparatus for sintering the asymmetric tubular filter element blank, wherein the apparatus for manufacturing the asymmetric tubular filter element blank is the manufacturing apparatus for an asymmetric tubular filter element blank described above.
The equipment for preparing the asymmetric tubular filter element has a simple structure, can prepare the film layer with uniform thickness and aperture and without defects such as cracks, pinholes and the like, and can remarkably improve the production efficiency.
It can be seen that the method for manufacturing an asymmetric tubular filter element blank according to the application introduces the centrifugal principle into the conventional coating preparation process, not only has a simple process, but also can obtain a coating with very uniform thickness distribution. The manufacturing equipment of the asymmetric tubular filter element blank body has a simple structure, integrates grouting and centrifugation, and can remarkably improve the preparation speed of a coating. The manufacturing method and the manufacturing equipment of the asymmetric tubular filter element with the manufacturing method and the manufacturing equipment of the asymmetric tubular filter element blank can remarkably improve the production efficiency of the asymmetric tubular filter element and the quality of the film layer.
The application is further described below with reference to the drawings and detailed description. Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The accompanying drawings, which form a part hereof, are shown by way of illustration and not of limitation, and in which are shown by way of illustration and description of the application. In the drawings:
fig. 1 is a cross-sectional view of an apparatus for manufacturing an asymmetric tubular filter element blank of embodiment 1 of the application.
Fig. 2 is a cross-sectional view of an apparatus for manufacturing an asymmetric tubular filter element blank of example 2 of the application.
Fig. 3 is a cross-sectional view of an apparatus for manufacturing an asymmetric tubular filter element blank of example 3 of the application.
Fig. 4 is a cross-sectional view of an apparatus for manufacturing an asymmetric tubular filter element blank of example 4 of the application.
Fig. 5 is a cross-sectional view of an apparatus for manufacturing an asymmetric tubular filter element blank of example 5 of the application.
The relevant marks in the drawings are as follows:
1: a support body;
21: a first sealing part;
22: a second sealing part;
3: a slurry flow channel;
4: a motor;
5: a rotating shaft;
51: a first rotating shaft;
52: a second rotating shaft;
53: a hollow tubular portion;
54: a cylindrical portion;
6: a first plug;
7: a pulp outlet hole;
8: grouting holes;
9: a second plug;
10: and a positioning mechanism.
Detailed Description
The present application will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the application based on these descriptions. Before describing the present application with reference to the accompanying drawings, it should be noted in particular that:
the technical solutions and technical features provided in the sections including the following description in the present application may be combined with each other without conflict.
In addition, the embodiments of the application that are referred to in the following description are typically only some, but not all, embodiments of the application. Therefore, all other embodiments, which can be made by one of ordinary skill in the art without undue burden, are intended to be within the scope of the present application, based on the embodiments of the present application.
Terms and units in relation to the present application. The terms "comprising," "having," and any variations thereof in the description and claims of the application and in the relevant sections are intended to cover a non-exclusive inclusion.
The asymmetric tubular filter element blank described in the following specific embodiments of the present application comprises a tubular and porous support body 1 and a coating layer located on the inner wall of the support body 1, wherein the coating layer is formed by drying a slurry attached to the inner wall of the support body 1; the asymmetric tubular filter element is formed by sintering the asymmetric tubular filter element blank, and the coating is converted into a film layer with a filtering function in the sintering process. The term "air flux" refers to the amount of air permeation per kilopascal of filtration pressure per hour per square meter of filtration area.
Example 1
The manufacturing equipment of the asymmetrical tubular filter element blank shown in fig. 1 comprises a sealing part, a grouting mechanism and a driving assembly for driving the support body 1 to rotate in the horizontal direction; wherein the sealing parts comprise a first sealing part 21 and a second sealing part 22 which are matched with two ends of the supporting body 1 respectively; the grouting mechanism comprises a slurry circulation channel 3 which is arranged on the first sealing part 21 and enables the inside and the outside of the support body 1 to be communicated; the driving assembly comprises a rotating shaft 5 connected with the first sealing part 21 and the second sealing part 22 and a motor 4 for driving the rotating shaft 5 to rotate.
The grouting mechanism further comprises a first plug 6 matched with the slurry circulation channel 3.
The first sealing portion 21, the second sealing portion 22 and the first plug 6 are made of elastic materials, and the elastic materials are rubber.
And a positioning mechanism 10 for positioning the rotating shaft 5.
The box body is provided with a rotating hole matched with the rotating shaft 5.
Example 2
The manufacturing apparatus of the asymmetrical tubular filter element blank of the present embodiment differs from the manufacturing apparatus of the asymmetrical tubular filter element blank described in embodiment 1 in that: as shown in fig. 2, the second sealing portion 22 is also provided with the slurry flow channel 3 and the first plug 6.
Example 3
The manufacturing equipment of the asymmetrical tubular filter element blank shown in fig. 3 comprises a sealing part, a grouting mechanism and a driving assembly for driving the support body 1 to rotate in the horizontal direction; wherein the sealing parts comprise a first sealing part 21 and a second sealing part 22 which are matched with two ends of the supporting body 1 respectively; the grouting mechanism comprises a slurry circulation channel 3 which is arranged on the first sealing part 21 and the second sealing part 22 and is used for leading the inside and the outside of the support body 1 to be communicated; the driving assembly comprises a rotating shaft 5 connected with the first sealing part 21 and the second sealing part 22 and a motor 4 for driving the rotating shaft 5 to rotate.
The rotating shaft 5 comprises a hollow tubular part 53 which passes through the slurry circulation channel 3 and is used for flowing the slurry, and the grouting mechanism further comprises a slurry outlet 7 which is arranged on the hollow tubular part 53 positioned inside the support body 1 and communicated with the inside of the support body 1, and a grouting hole 8 which is arranged on the hollow tubular part 53 positioned outside the support body 1.
The grouting mechanism further comprises a second plug 9 matched with the grouting hole 8; the second plug 9 is in threaded connection with the grouting hole 8.
The materials of the first sealing portion 21 and the second sealing portion 22 are elastic materials, and the elastic materials are rubber.
And the device also comprises a positioning mechanism for positioning the rotating shaft 5.
The box body is provided with a rotating hole matched with the rotating shaft 5.
Example 4
The manufacturing equipment of the asymmetrical tubular filter element blank shown in fig. 4 comprises a sealing part, a grouting mechanism and a driving assembly for driving the support body 1 to rotate in the horizontal direction; wherein the sealing parts comprise a first sealing part 21 and a second sealing part 22 which are matched with two ends of the supporting body 1 respectively; the grouting mechanism comprises a slurry circulation channel 3 which is arranged on the second sealing part 22 and enables the inside and the outside of the support body 1 to be communicated; the driving assembly comprises a rotating shaft 5 connected with the first sealing part 21 and the second sealing part 22 and a motor 4 for driving the rotating shaft 5 to rotate.
The rotating shaft 5 comprises a first rotating shaft 51 connected with the first sealing part 21 and a second rotating shaft 52 connected with the second sealing part 22, the second rotating shaft 52 comprises a cylindrical part 54, the cylindrical part 54 is matched with the slurry circulation channel 3, and the grouting mechanism further comprises a grouting hole 8 arranged on the cylindrical part 54.
The grouting mechanism further comprises a second plug 9 matched with the grouting hole 8; the second plug 9 is in threaded connection with the grouting hole 8.
The materials of the first sealing portion 21 and the second sealing portion 22 are elastic materials, and the elastic materials are rubber.
And a positioning mechanism 10 for positioning the rotating shaft 5.
The box body is provided with a rotating hole matched with the rotating shaft 5.
Example 5
The manufacturing apparatus of the asymmetrical tubular filter element blank of the present embodiment differs from the manufacturing apparatus of the asymmetrical tubular filter element blank of embodiment 4 in that: as shown in fig. 5, the slurry flow channel 3 is also provided on the first sealing portion 21, and correspondingly, the first rotating shaft 51 includes a cylindrical portion 54, the cylindrical portion 54 cooperates with the slurry flow channel 3, and the grouting mechanism further includes a grouting hole 8 provided on the cylindrical portion 54.
The apparatus for manufacturing an asymmetric tubular filter element of the present application includes the apparatus for manufacturing an asymmetric tubular filter element of one of examples 1 to 5, the apparatus for drying the asymmetric tubular filter element blank, and the apparatus for sintering the asymmetric tubular filter element blank. Wherein, the equipment for drying the asymmetrical tubular filter element blank and the equipment for sintering the asymmetrical tubular filter element blank are both existing equipment.
In order to more clearly illustrate the beneficial effects of the method of manufacturing an asymmetrical tubular filter element blank according to the application, specific examples 6-10 are described below, wherein all of the examples 6-10 employ the apparatus for manufacturing an asymmetrical tubular filter element blank according to example 4.
The method of making asymmetric tubular filter elements of examples 6-10 each include the steps of:
(1) Support 1 preparation:
(1) titanium powder and aluminum powder are taken as second raw material powder, and the titanium powder with the particle size of-200 to +400 meshes and 66.7 parts by weight and the aluminum powder with the particle size of-200 to +400 meshes and 33.3 parts by weight are added into a V-shaped mixer to be mixed for 8 hours; the meaning of the "-200- +400 mesh" is: the second raw material powder can leak through 200 meshes but not 400 meshes, when the second raw material powder with the mesh number is screened, a 400-mesh screen is placed below the 200-mesh screen, and the first powder with the mesh number of-200 to +400 is left on the 400-mesh screen;
(2) adding stearic acid into 70 ℃ alcohol to dissolve the stearic acid serving as a granulating agent, adding the mixed second raw material powder in the step (1) into a mixer, slowly and uniformly adding a stearic acid solution in the stirring process, stirring for 5 hours, granulating by a granulator, selecting a screen for 30 meshes, and drying in a 50 ℃ oven;
(3) assembling a die, adding the granulated second raw material powder into a die cavity, pressing the second raw material powder into a tubular support body 1 precursor through a cold isostatic press, and demolding;
(4) placing hollow spheres with the particle size of 30 meshes into a cavity of a precursor of the support body 1, then loading the precursor of the support body 1 into a sintering boat, then sintering in a furnace at the sintering temperature of 1250 ℃ for 6 hours, and cooling to obtain the support body 1, wherein the thickness, the inner diameter and the pore diameter of the obtained support body 1 are shown in Table 1;
(2) Preparing slurry:
(1) adding the first raw material powder into a V-type mixer according to the particle size and the type requirements of the first raw material powder in the table 1, and mixing for 8 hours; wherein A is the aperture of the support body 1, B is the particle size of titanium powder in the first raw material powder, and C is the particle size of aluminum powder in the first raw material powder;
(2) adding ethylene glycol into absolute ethyl alcohol, and uniformly mixing the ethylene glycol and the absolute ethyl alcohol in a volume ratio of (1:9);
(3) slowly adding the mixed first raw material powder into the glycol alcohol mixed solution in the stirring process, adding 2ml of glycol absolute ethanol mixed solution into each 1g of the first raw material powder, stirring for 30min, and then carrying out ultrasonic treatment for 10min to obtain slurry;
table 1 shows the composition and ratio of the first raw material powder.
(3) Preparing a coating:
(1) installing the support body 1 prepared in the step (1) according to the connection relation shown in fig. 4;
(2) opening a grouting hole 8, injecting the slurry prepared in the step (2) into the support body 1, and then installing a second plug 9;
(3) starting the motor 4 to enable the support body 1 to rotate for 2-20 min at the rotating speed of 100-500 r/min, wherein the specific rotation parameters are shown in the table 2;
(4) naturally drying for 1h to obtain an asymmetric tubular filter element blank;
table 2 shows the process parameters for the preparation of the coating and the parameters of the coating.
(4) Sintering: and (3) placing hollow spheres with the particle size of 50 meshes into the cavity of the support body 1 containing the coating, which is prepared in the step (3), sintering according to the sintering parameters shown in the table 3, wherein the heating rate of the whole sintering process is 3 ℃/min, and obtaining the asymmetric tubular filter element after the sintering, wherein the pore diameter and the performance parameters of the asymmetric tubular filter element are shown in the table 3.
Table 3 shows the sintering process parameters of the coating and the parameters of the film.
The following conclusions can be drawn by examples 6 to 10:
1) When the aperture of the support body 1 is 1-3 times of the particle size of the first raw material powder, the first raw material powder can be prevented from being thrown out, and the binding force between the film layer and the support body 1 is stronger; preferably, the pore diameter of the support 1 is 1.8 to 2.5 times of the particle diameter of the first raw material powder;
2) The pipe wall thickness of the support body 1 is 1-6 mm; when the inner diameter of the support body 1 is 20-100 mm, the support body 1 is not easy to deform in the rotation process, and at the moment, the thickness of the coating is 0.01-2 mm, so that the filtering pressure can be reduced on the premise of keeping a good filtering effect. Preferably, the pipe wall thickness of the support body 1 is 2-4 mm; the inner diameter of the support body 1 is 30-75 mm; the thickness of the coating is 0.05-1 mm;
3) When the rotating speed of the support body 1 is 100-500 r/min and the rotating time is 2-20 min, the higher production efficiency can be maintained, and the first raw material powder can be uniformly distributed; preferably, the rotating speed of the support body 1 is 200-300 r/min, and the rotating time is 5-15 min;
4) When the particle size of the first raw material powder is 1-12 mu m, and the particle size of the second raw material powder is-200- +400 meshes, an asymmetric tubular filter element with proper pore diameter and high gas flux is easy to obtain.
The content of the present application is described above. Those of ordinary skill in the art will be able to implement the application based on these descriptions. Based on the foregoing, all other embodiments that may be obtained by one of ordinary skill in the art without undue burden are within the scope of the present application.
Claims (10)
1. Manufacturing equipment of asymmetric tubular filter element body, asymmetric tubular filter element body includes tubular and porous support body (1) and is located the coating of support body (1) inner wall, the coating is formed by the inner wall that thick liquids attached to support body (1) is dried, its characterized in that: the manufacturing equipment comprises a sealing part, a grouting mechanism and a driving assembly for driving the support body (1) to rotate in the horizontal direction;
the sealing part comprises a first sealing part (21) and a second sealing part (22) which are respectively matched with two ends of the support body (1);
the grouting mechanism comprises a slurry circulation channel (3) which is arranged on the first sealing part (21) and/or the second sealing part (22) and enables the inside and the outside of the support body (1) to be communicated;
the driving assembly comprises a rotating shaft (5) connected with the first sealing part (21) and the second sealing part (22) and a motor (4) for driving the rotating shaft to rotate;
the device also comprises a box body for recycling the dispersing agent while preventing the dispersing agent from splashing, wherein a rotating hole matched with the rotating shaft is formed in the box body;
the thickness of the coating is 0.01-2 mm.
2. The apparatus for manufacturing an asymmetrical tubular filter element blank as claimed in claim 1, wherein: the grouting mechanism further comprises a first plug (6) matched with the slurry circulation channel (3).
3. The apparatus for manufacturing an asymmetrical tubular filter element blank as claimed in claim 1, wherein: the rotating shaft (5) comprises a hollow tubular part (53) which penetrates through the slurry circulation channel (3) and is used for flowing slurry, and the grouting mechanism further comprises a slurry outlet hole (7) which is arranged on the hollow tubular part (53) inside the support body (1) and is communicated with the inside of the support body (1) and a grouting hole (8) which is arranged on the hollow tubular part (53) outside the support body (1).
4. The apparatus for manufacturing an asymmetrical tubular filter element blank as claimed in claim 1, wherein: the rotary shaft (5) comprises a first rotary shaft (51) connected with the first sealing part (21) and a second rotary shaft (52) connected with the second sealing part (22), the first rotary shaft (51) and/or the second rotary shaft (52) comprise a cylindrical part (54), the cylindrical part (54) is matched with the slurry circulation channel (3), and the grouting mechanism further comprises a grouting hole (8) formed in the cylindrical part (54).
5. An apparatus for manufacturing an asymmetrical tubular filter element blank as claimed in claim 3 or 4, wherein: the grouting mechanism further comprises a second plug (9) matched with the grouting hole (8).
6. The apparatus for manufacturing an asymmetrical tubular filter element blank as claimed in claim 5, wherein: the second plug (9) is in threaded connection with the grouting hole (8).
7. The apparatus for manufacturing an asymmetrical tubular filter element blank as claimed in claim 1, wherein: the material of the first sealing part (21) and/or the second sealing part (22) is elastic material.
8. The apparatus for manufacturing an asymmetrical tubular filter element blank as claimed in claim 1, wherein: the device also comprises a positioning mechanism for positioning the rotating shaft (5).
9. The apparatus for manufacturing an asymmetrical tubular filter element blank as claimed in claim 1, wherein: the pipe wall thickness of the support body (1) is 1-6 mm; the inner diameter of the support body (1) is 20-100 mm.
10. Apparatus for manufacturing an asymmetric tubular filter element from an asymmetric tubular filter element blank sintered, the apparatus comprising apparatus for manufacturing the asymmetric tubular filter element blank, apparatus for drying the asymmetric tubular filter element blank, and apparatus for sintering the asymmetric tubular filter element blank, characterized in that: the apparatus for manufacturing the asymmetrical tubular filter element blank is an apparatus for manufacturing an asymmetrical tubular filter element blank according to any one of claims 1-9.
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| CN107551826A (en) | 2018-01-09 |
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