Drying jig for silicon carbide ceramic tubular membrane

Abstract

The utility model relates to the technical field of silicon carbide, and concretely relates to a drying jig of silicon carbide ceramic pipe type membrane, which comprises a support frame, a first support plate and a second support plate arranged on the support frame, a connecting pipe connected to the first support plate and used for connecting a hot air conveying device, a driving component connected to the first support plate and the second support plate, and a plurality of silicon carbide hollow pipes connected to the driving component. The utility model sets the silicon carbide hollow pipe with an axial through structure as the drying jig of the workpiece. The silicon carbide hollow pipe can be driven by the driving component to rotate at a constant speed. Meanwhile, controllable warm air is continuously input at the end of the silicon carbide hollow pipe to uniformly dry the blank in the silicon carbide hollow pipe during rotation, so that the deformation caused by gravity can be offset, the qualified rate of the product is improved, and the drying speed is improved through the multi-path heat conduction of convection and radiation.

Description

Technical Field

[0001] This utility model relates to the field of silicon carbide technology, and more specifically to a drying fixture for silicon carbide ceramic tubular membranes. Background Technology

[0002] Silicon carbide (SiC) tubular membranes are asymmetric inorganic ceramic membranes composed of a porous support layer, a transition layer, and a separation layer. They are manufactured entirely from silicon carbide material through extrusion molding, drying, and high-temperature sintering. The separation layer is typically 15 μm thick. By precisely controlling the pore size, microfiltration or ultrafiltration levels are achieved. These membranes possess high strength, high temperature resistance, acid and alkali corrosion resistance, and high flux, making them widely used in water treatment, chemical separation, and high-temperature gas purification.

[0003] However, in the drying process of silicon carbide tubular membranes, the drying time usually exceeds 8 hours. Due to the long drying time, especially for tubular membranes with an aspect ratio exceeding 20:1, the rate of water evaporation varies in different parts of the membrane (such as the inner and outer walls, and different length positions). The ends dry quickly, while the middle dries slowly, causing axial stress to concentrate in the middle, generating uneven shrinkage stress. This easily leads to bending deformation, resulting in the roundness and straightness error of the dried product often exceeding ±0.5mm, which is far higher than the industry standard requirement of less than ±0.2mm. Therefore, the yield rate of long-size products is less than 60%. Utility Model Content

[0004] To address the technical problems existing in the drying of silicon carbide ceramic tubular membranes in the prior art, this utility model proposes a technical solution: a drying fixture for silicon carbide ceramic tubular membranes, comprising:

[0005] A support frame, wherein a first support plate and a second support plate are provided on the support frame;

[0006] A connecting pipe is connected to the first support plate, and the connecting pipe is used to connect a hot air conveying device;

[0007] A drive component is connected to the first support plate and the second support plate;

[0008] Multiple hollow silicon carbide tubes are connected to the driving component and can be driven by the driving component to rotate at the same speed;

[0009] The hollow silicon carbide tube has an internal cavity for accommodating the workpiece to be dried. Along the axial direction of the cavity, the cavity is located within the outline of the connecting tube. When the workpiece to be dried is placed in the cavity, the hollow silicon carbide tube rotates at a predetermined speed, and the hot air delivered by the hot air conveying device performs convective heat transfer and radiative heat transfer through the hollow silicon carbide tube to achieve drying.

[0010] Preferably, a gap d of 0.5 to 1.5 mm is formed between the silicon carbide hollow tube and the workpiece to be dried.

[0011] Preferably, the wall of the silicon carbide hollow tube has a gradient porous structure, and the porosity on the outer side of the wall is greater than that on the inner side.

[0012] Preferably, the porosity of the silicon carbide hollow tube is 15-30%.

[0013] Preferably, the axial direction of the connecting pipe is parallel to the axial direction of the silicon carbide hollow tube, so that hot air flows through the surface and cavity of the silicon carbide hollow tube in a direction parallel to the axial direction of the silicon carbide hollow tube.

[0014] Preferably, the driving component includes a motor connected to the first support plate, multiple pulley sets, and multiple sets of idler roller structures connected between the first support plate and the second support plate. The motor is connected to the pulley sets via a synchronous belt, and each pulley set is coaxially connected to the idler roller structure. When the motor drives the pulley sets to rotate, the idler roller structure rotates synchronously. The silicon carbide hollow tube is placed on the surface of the idler roller structure and is driven to rotate.

[0015] Preferably, the idler structure includes a pair of shafts and a pair of rollers, each pair of rollers including a first roller and a second roller connected to the same shaft, the shaft being connected to the pulleys in the pulley assembly.

[0016] Preferably, the plurality of the connecting pipes are arranged in a row on the surface of the first support plate, and the pulley assembly includes a pair of pulleys disposed below each connecting pipe in the current row.

[0017] Preferably, the rotational speed of the silicon carbide hollow tube is 5 to 20 rpm.

[0018] Preferably, the temperature of the hot air entering the connecting pipe is 60-120°C and the wind speed is 2-5 m / s.

[0019] Compared with the prior art, the advantages of this utility model are:

[0020] This invention uses a silicon carbide hollow tube with an axially through structure as a drying fixture for the workpiece. The silicon carbide hollow tube can be driven by a drive component to achieve uniform rotation. At the same time, a controllable hot airflow is continuously input into the end of the silicon carbide hollow tube, so that the blank inside the silicon carbide hollow tube is dried evenly during rotation. This can counteract the deformation caused by gravity and improve the product qualification rate. At the same time, the drying speed is improved through multi-path heat conduction of convection and radiation. Attached Figure Description

[0021] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0022] Figure 1(a) is a schematic diagram of the drying state of silicon carbide ceramic tubular membrane in the prior art;

[0023] Figure 1(b) is a schematic diagram of the deformation of silicon carbide ceramic tubular membrane during drying in the prior art;

[0024] Figure 2 This is a schematic diagram of the silicon carbide ceramic tubular membrane being dried in a silicon carbide hollow tube, as shown in this utility model.

[0025] Figure 3 This is a schematic diagram of the structure of the drying fixture for the silicon carbide ceramic tubular membrane shown in this utility model;

[0026] Figure 4 This is a schematic diagram of the silicon carbide hollow tube being supported by a driven component, as shown in this utility model. Detailed Implementation

[0027] To better understand the technical content of this utility model, specific embodiments are provided below in conjunction with the accompanying drawings.

[0028] like Figure 1(a) and 1(b) As shown, in the prior art, during the static drying process of silicon carbide ceramic tubular film, the axial shrinkage of the tubular film is uneven due to the long drying time, resulting in deformation defects in the ellipticity of the uncured preform.

[0029] Based on the above issues, such as Figures 2 to 4 As shown, this application proposes a new drying fixture for silicon carbide ceramic tubular membranes, which mainly includes a support frame 10, a connecting pipe 20, a driving component 30, and a plurality of silicon carbide hollow tubes 40.

[0030] The support frame 10 is a cubic frame formed by splicing rod-shaped structures. The support frame 10 is provided with a first support plate 11 and a second support plate 12. The connecting pipe 20 is connected to the first support plate 11 and is used to connect the hot air conveying device.

[0031] The hot air conveying device can be a hot air blower. The hot air blower can connect multiple air outlet pipes to different connecting pipes 20, such as connecting a row at a time, so that the temperature of the hot air flowing through each connecting pipe 20 is as similar as possible, in order to facilitate the consistency of drying.

[0032] Furthermore, the drive component 30 is connected to the first support plate 11 and the second support plate 12, and a plurality of silicon carbide hollow tubes 40 are connected to the drive component 30 and can be driven by the drive component 30 to rotate at the same speed.

[0033] Thus, by controlling the drive component 30, multiple silicon carbide hollow tubes 40 can be controlled to rotate at a predetermined speed, which helps to ensure the consistency of drying of multiple workpieces to be dried, that is, to have the same hot air temperature and flow rate and the same rotation speed.

[0034] The hollow silicon carbide tube 40 has a cavity inside to accommodate the workpiece to be dried. Along the axial direction of the cavity, the cavity is located within the outline of the connecting tube 20. When the workpiece to be dried is placed in the cavity, the hollow silicon carbide tube 40 rotates at a predetermined speed, and the hot air delivered by the hot air conveying device performs convective heat transfer on the workpiece to be dried and radiative heat transfer through the hollow silicon carbide tube 40 to achieve drying.

[0035] Combination Figure 2 As shown, unlike the prior art, the workpiece to be dried (silicon carbide ceramic tubular membrane 100) in this application is placed in the cavity of silicon carbide hollow tube 40 for drying. During the drying process, the workpiece to be dried can rotate with the rotation of silicon carbide hollow tube 40, thereby avoiding axial deformation (flattening) caused by static placement and gravity, thus improving the product qualification rate.

[0036] In an optional embodiment, a gap d of 0.5 to 1.5 mm is formed between the silicon carbide hollow tube 40 and the workpiece to be dried.

[0037] Thus, a gap is formed between the silicon carbide hollow tube 40 and the workpiece to be dried, allowing the hot air to pass through. This enables the hot air to convect and transfer heat to dry the workpiece. At the same time, the hot air heats the silicon carbide hollow tube 40, and radiative heat transfer can occur between the silicon carbide hollow tube 40 and the workpiece to be dried. Due to the small gap, higher heat transfer efficiency can be achieved, shortening the drying time.

[0038] Furthermore, the wall of the silicon carbide hollow tube 40 has a gradient porous structure, and the porosity on the outer side of the wall of the silicon carbide hollow tube 40 is greater than the porosity on the inner side of the wall.

[0039] Thus, the porous structure facilitates heat exchange between the hot air and the silicon carbide hollow tube 40, improving heat transfer efficiency.

[0040] In a preferred embodiment, the porosity of the silicon carbide hollow tube 40 is 15-30%. This ensures both the strength of the silicon carbide hollow tube 40 and meets the requirements for more efficient heat transfer.

[0041] In the above embodiment, the axial direction of the connecting pipe 20 is parallel to the axial direction of the silicon carbide hollow pipe 40, so that hot air flows through the surface and cavity of the silicon carbide hollow pipe 40 in a direction parallel to the axial direction of the silicon carbide hollow pipe 40.

[0042] Combination Figure 3 and Figure 4 As shown, the drive component 30 includes a motor 31 connected to the first support plate 11, multiple pulley sets 32, and multiple sets of idler roller structures connected between the first support plate 11 and the second support plate 12. The motor 31 is connected to the pulley sets 32 via a synchronous belt. Each pulley set 32 ​​is coaxially connected to the idler roller structure. When the motor 31 drives the pulley sets 32 to rotate, the idler roller structure rotates synchronously. The silicon carbide hollow tube 40 is placed on the surface of the idler roller structure and is driven to rotate.

[0043] Specifically, the idler structure includes a pair of rotating shafts 33 and a pair of rollers 34. Each pair of rollers 34 includes a first roller 341 and a second roller 342 connected to the same rotating shaft 33. The rotating shaft 33 is connected to the pulleys in the pulley group 32.

[0044] Thus, when the motor 31 rotates, the synchronous belt can drive multiple pulley sets 32 to rotate synchronously, and the pulley sets 32 can drive the roller structure to rotate through coaxial connection, so that the speed of the silicon carbide hollow tube 40 is controllable.

[0045] In an optional embodiment, the silicon carbide hollow tube 40 rotates at a speed of 5–20 rpm. The hot air entering the connecting pipe 20 has a temperature of 60–120°C and a wind speed of 2–5 m / s.

[0046] Furthermore, such as Figure 3 and Figure 4 As shown, multiple connecting pipes 20 are arranged in a row on the surface of the first support plate 11, and the pulley assembly 32 includes a pair of pulleys disposed below each connecting pipe 20 in the current row.

[0047] In this way, one motor 31 can drive multiple pulley groups 32 in the same row to rotate synchronously, so that the silicon carbide hollow tubes 40 in a row maintain the same speed, which helps to ensure the consistency of the drying process.

[0048] In conjunction with the above embodiments, this utility model uses a silicon carbide hollow tube with an axially through structure as a drying fixture for the workpiece. The silicon carbide hollow tube can be driven by a driving component to achieve uniform rotation. At the same time, a controllable hot airflow is continuously input at the end of the silicon carbide hollow tube, so that the blank inside the silicon carbide hollow tube is dried evenly during rotation. This can counteract the deformation caused by gravity and improve the product qualification rate. At the same time, the drying speed is improved through multi-path heat conduction of convection and radiation.

[0049] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A drying fixture for a silicon carbide ceramic tubular membrane, characterized in that, include: A support frame (10) is provided with a first support plate (11) and a second support plate (12). A connecting pipe (20) is connected to the first support plate (11), and the connecting pipe (20) is used to connect a hot air conveying device; The drive component (30) is connected to the first support plate (11) and the second support plate (12). Multiple silicon carbide hollow tubes (40) are connected to the drive component (30) and can be driven by the drive component (30) to rotate at the same speed; The hollow silicon carbide tube (40) has a cavity inside to accommodate the workpiece to be dried. Along the axial direction of the cavity, the cavity is located within the outline of the connecting pipe (20). When the workpiece to be dried is placed in the cavity, the hollow silicon carbide tube (40) rotates at a predetermined speed, and the hot air delivered by the hot air conveying device performs convective heat transfer on the workpiece to be dried and radiative heat transfer through the hollow silicon carbide tube (40) to achieve drying.

2. The drying fixture for the silicon carbide ceramic tubular membrane according to claim 1, characterized in that, A gap d of 0.5~1.5mm is formed between the silicon carbide hollow tube (40) and the workpiece to be dried.

3. The drying fixture for the silicon carbide ceramic tubular membrane according to claim 1, characterized in that, The wall of the silicon carbide hollow tube (40) has a gradient porous structure, and the porosity of the outer side of the wall of the silicon carbide hollow tube (40) is greater than that of the inner side of the wall.

4. The drying fixture for the silicon carbide ceramic tubular membrane according to claim 3, characterized in that, The porosity of the silicon carbide hollow tube (40) is 15-30%.

5. The drying fixture for the silicon carbide ceramic tubular membrane according to claim 1, characterized in that, The axial direction of the connecting pipe (20) is parallel to the axial direction of the silicon carbide hollow pipe (40), so that hot air flows through the surface and cavity of the silicon carbide hollow pipe (40) in a direction parallel to the axial direction of the silicon carbide hollow pipe (40).

6. The drying fixture for the silicon carbide ceramic tubular membrane according to claim 1, characterized in that, The driving component (30) includes a motor (31) connected to the first support plate (11), a plurality of pulley groups (32), and a plurality of roller structures connected between the first support plate (11) and the second support plate (12). The motor (31) is connected to the pulley group (32) via a synchronous belt. Each pulley group (32) is coaxially connected to the roller structure. When the motor (31) drives the pulley group (32) to rotate, the roller structure rotates synchronously. The silicon carbide hollow tube (40) is placed on the surface of the roller structure and is driven to rotate.

7. The drying fixture for the silicon carbide ceramic tubular membrane according to claim 6, characterized in that, The roller structure includes a pair of shafts (33) and a pair of rollers (34), each pair of rollers (34) including a first roller (341) and a second roller (342) connected to the same shaft (33), the shaft (33) being connected to the pulleys in the pulley group (32).

8. The drying fixture for the silicon carbide ceramic tubular membrane according to claim 6, characterized in that, Multiple connecting tubes (20) are arranged in a row on the surface of the first support plate (11), and the pulley assembly (32) includes a pair of pulleys disposed below each connecting tube (20) in the current row.

9. The drying fixture for the silicon carbide ceramic tubular membrane according to claim 1, characterized in that, The rotational speed of the silicon carbide hollow tube (40) is 5~20 rpm.

10. The drying fixture for the silicon carbide ceramic tubular membrane according to claim 1, characterized in that, The hot air temperature entering the connecting pipe (20) is 60~120℃ and the wind speed is 2~5m / s.

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