CN216778769U - Heat transfer rate controllable device for performing bidirectional freezing casting on solution - Google Patents
Heat transfer rate controllable device for performing bidirectional freezing casting on solution Download PDFInfo
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- CN216778769U CN216778769U CN202123325934.7U CN202123325934U CN216778769U CN 216778769 U CN216778769 U CN 216778769U CN 202123325934 U CN202123325934 U CN 202123325934U CN 216778769 U CN216778769 U CN 216778769U
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Abstract
The utility model discloses a device with controllable heat transfer rate for carrying out bidirectional freezing casting on solution, which relates to the technical field of solution freezing devices and comprises a freezing component, wherein the freezing component comprises a heat conducting plate and a freezing tank for filling freezing solution, and the freezing tank is arranged on the heat conducting plate; the sealed tank is used for storing a cold source, and one leg of the heat conducting plate is placed into the sealed tank for freezing casting; and the basin jar, another foot of heat-conducting plate is put into in the basin jar to carry out the freeze casting, thereby realize two-way freeze casting, the basin jar is provided with the unit that generates heat, the unit that generates heat include the heating tube and with the temperature control system that the heating tube electricity is connected, temperature control system is used for controlling the heating power of heating tube is in order to adjust the temperature of basin jar, thereby adjust the two foot difference in temperature of heat-conducting plate. The utility model can control the heat transfer rate and realize bidirectional freeze casting.
Description
Technical Field
The utility model relates to the technical field of solution freezing devices, in particular to a device with controllable heat transfer rate for carrying out bidirectional freezing casting on solution.
Background
The aerogel serving as a gel material formed by dispersing gas in a solid three-dimensional network has the characteristics of low density, high porosity, high specific surface area, chemical stability, compressibility, heat resistance, electric conductivity and the like. Currently, aerogel materials have wide application prospects in the fields of strain sensors, flame retardance, fire prevention, sewage treatment, supercapacitors, electromagnetic shielding and the like. However, currently commercially available silica aerogels are often prepared using a sol-gel method and a supercritical drying two-step method. The aerogel prepared by the method has small resilience and crisp quality, and cannot meet the application requirements of high-end fields. In recent years, with the appearance of graphene aerogel, nanocellulose aerogel, MXene aerogel, polyimide aerogel and various hybrid aerogels, the improvement and breakthrough of a normal-temperature drying method and a freeze-drying method are continuously realized, and the three-dimensional network of the aerogel has a richer porous structure and more excellent mechanical properties.
Among the various methods for the preparation of aerogel materials, freeze-drying is one of the most promising methods. The freeze-drying method refers to a process of forming a wet gel by directly freezing a precursor solution of a reactant and forming an aerogel by removing water therefrom through drying, which includes two steps of freeze-casting and low-temperature vacuum drying. The key to controlling the microstructure and mechanical properties of the aerogel lies in the process of freeze casting. The freeze casting may be classified into one-way freeze casting, two-way freeze casting, and axial freeze casting. Freeze casting refers to a process in which a cold source freezes a solution from a certain direction, so that ice crystals in the direction grow, and a solute is extruded to form a gel skeleton structure. Therefore, the freezing mode of the solution is only controlled to obtain materials with different porous structures. Bidirectional freeze casting refers to the freeze casting of a solution from two perpendicular different directions by a cold source. The key point is to set the temperature difference in two different directions. For example, the cold source is used as an origin, and the heat sources are respectively arranged in the end directions of the x axis and the y axis to form two different heat transfer directions. The two heat transfer directions are combined to form a heat transfer surface, and finally layer-by-layer freezing casting of the solution is realized.
At present, no device for bi-directional chill casting of solutions with controlled heat transfer rates is known.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, the embodiment of the utility model provides a device for performing bidirectional freeze casting on a solution, which has a controllable heat transfer rate, and can control the heat transfer rate to realize bidirectional freeze casting.
The device for performing bidirectional freezing casting on the solution with the controllable heat transfer rate comprises a freezing assembly, a heat conducting plate and a freezing groove, wherein the freezing groove is used for filling the freezing solution and is arranged on the heat conducting plate; the sealed tank is used for storing a cold source, and one leg of the heat conducting plate is placed into the sealed tank for freeze casting; and the basin jar, another foot of heat-conducting plate is put into in the basin jar to freezing casting is carried out, thereby realizes two-way freezing casting, the basin jar is provided with the heating unit, the heating unit include the heating tube and with the temperature control system that the heating tube electricity is connected, temperature control system is used for controlling the heating power of heating tube, in order to adjust the temperature of basin jar, thereby adjust the two foot difference in temperature of heat-conducting plate.
In an optional or preferred embodiment, the heat generating unit further includes a temperature sensor disposed in the water tank, and the temperature sensor is electrically connected to the temperature control system to feed back a measured temperature signal to the temperature control system.
In an optional or preferred embodiment, the temperature control system is a PLC temperature control system, and the temperature control system, the temperature sensor and the heating tube are connected in series.
In an optional or preferred embodiment, the heat conducting plate is a bridge-type heat conducting plate, the heat conducting plate is a copper plate member or a silver-plated copper plate member, the heat conducting plate comprises a heat conducting metal plate and two pins located at two ends of the heat conducting metal plate, and the thickness of the heat conducting metal plate is not less than 5 mm.
In an alternative or preferred embodiment, the sealing tank and the water tank are provided with sockets for the pins to be inserted, and the sockets of the sealing tank are provided with first sealing rings to prevent the cold source from leaking from gaps of the sockets.
In an optional or preferred embodiment, the sealing tank adopts a sandwich structure, and comprises an outer shell and an inner container, wherein an insulating layer is arranged between the outer shell and the inner container.
In an optional or preferred embodiment, the thickness of the insulating layer is not less than 5mm, and the insulating layer is made of silica aerogel or carbon aerogel.
In an optional or preferred embodiment, the sealing tank comprises a tank body with an open top and a sealing cover, the tank body and the sealing cover both adopt a sandwich structure, and a second sealing ring is arranged between the tank body and the sealing cover.
In an optional or preferred embodiment, the height of the heat conducting plate is slightly smaller than the depth of the inner container, and the height of the heat conducting plate is slightly smaller than the depth of the water tank.
In an alternative or preferred embodiment, the freezing groove is a silicon rubber component, the wall thickness of the freezing groove is not less than 5mm, the heat conducting plate is provided with a bayonet for installing the freezing groove, the depth of the bayonet is not more than 1mm, and the width of the bayonet is equal to the opening width of the bottom of the freezing groove.
Based on the technical scheme, the embodiment of the utility model at least has the following beneficial effects: above-mentioned technical scheme is through designing the basin jar of an adjustable temperature as the heat source to regard the coolant in the canned food as the cold source, connect heat source and cold source through the heat-conducting plate, realize the heat exchange in the horizontal direction. The temperature of the water tank is controlled through the heating tube and the temperature control system, and the temperature difference between two feet of the heat conducting plate, namely the temperature difference between the water temperature of the water tank and the cold source in the sealing tank is adjusted, so that the heat transfer rate is controlled, and the bidirectional freezing casting is realized. The utility model can realize bidirectional freezing of multi-component solutions such as nano material dispersion liquid, polymer solution and the like, and has controllable heat transfer rate and convenient operation.
Drawings
The utility model is further described below with reference to the accompanying drawings and examples;
FIG. 1 is a top view of an embodiment of the present invention;
fig. 2 is a cross-sectional view of an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 to 2, an apparatus for bi-directional freeze casting of a solution with controllable heat transfer rate includes a hermetic vessel 10, a water tank 21, and a freezing assembly 30. Wherein, the sealed tank 10 is used for storing a cold source, and the cold source can be liquid nitrogen or dry ice. The water tank 21 is used for holding water.
Preferably, the freezing groove 32 is a silicon rubber member with a wall thickness not less than 5mm, the freezing groove 32 is a rectangular silicon rubber frame with an upper opening and a lower opening, the heat conducting plate 31 is provided with a bayonet for installing the freezing groove 32, the depth of the bayonet is not more than 1mm, and the width of the bayonet is equal to the opening width of the bottom of the freezing groove 32. In this embodiment, the freezing tank 32 is made of low temperature resistant silicone rubber, and has a thickness of 5 mm. The bayonet on the heat conducting plate 31 is 1mm deep and 5mm wide, and the freezing groove 32 can be positioned.
The freezing assembly 30 includes a heat conductive plate 31 and a freezing tank 32 for filling a freezing solution, the freezing tank 32 being disposed on the heat conductive plate 31. One leg of the heat conducting plate 31 is put into the hermetic vessel 10 for performing the freeze casting, and the water tank 21 and the other leg of the heat conducting plate 31 are put into the water tank 21 for performing the freeze casting; the cold source of the sealed tank 10 and the water temperature of the water tank 21 form a temperature gradient, thereby realizing bidirectional freeze casting.
In this embodiment, the basin jar 21 is provided with the heating unit, and the heating unit includes heating tube 22 and the temperature control system 24 who is connected with heating tube 22 electricity, and temperature control system 24 is used for controlling the heating power of heating tube 22 to adjust the temperature of basin jar 21, thereby adjust the two foot differences in temperature of heat-conducting plate 31.
It can be understood that, in the present embodiment, heat exchange is achieved in the horizontal direction by designing a temperature-adjustable water tank 21 as a heat source, and connecting the heat source and the heat sink via a heat conducting plate 31 with a cooling medium in the sealed tank 10 as a heat sink. The temperature of the water tank 21 is controlled by the heating tube 22 and the temperature control system 24, and the temperature difference between two feet of the heat conducting plate 31, namely the temperature difference between the water temperature of the water tank 21 and the cold source in the seal tank 10, is adjusted, so that the heat transfer rate is controlled, and the bidirectional freezing casting is realized.
Specifically, the heating unit further includes a temperature sensor 23 disposed in the water tank 21, the temperature sensor 23 is specifically a contact temperature sensor, and the temperature sensor 23 is electrically connected to the temperature control system 24 to feed back a measured temperature signal to the temperature control system 24. Further, the temperature control system 24 is a PLC temperature control system, and the temperature control system 24, the temperature sensor 23 and the heating tube 22 are connected in series.
The temperature control system 24 has a temperature setting function, a temperature display function and a function of controlling the on/off of the heating tube.
Wherein, the heat-conducting plate 31 is the bridge type heat-conducting plate, and the heat-conducting plate 31 is copper plate component or silver-plated copper plate component, and the heat-conducting plate 31 includes heat conduction metal sheet and two pins that are located heat conduction metal sheet both ends, and the thickness of heat conduction metal sheet is no less than 5 mm. In one embodiment of the present invention, the sealing can 10 and the water tank 21 are provided with sockets into which pins are inserted, and the socket of the sealing can 10 is provided with a first gasket 16 to prevent the cold source from leaking from the gap of the socket. It will be appreciated that the thermally conductive plate 31 is removable, so that the overall device is portable.
The sealing can 10 has a sandwich structure, the sealing can 10 includes a housing and an inner container 15, and both legs of the heat conducting plate 31 are inserted into the inner container 15 and the bottom of the water tank 21, respectively, and are kept below the liquid level. The height of the heat conducting plate 31 is slightly smaller than the depth of the inner container 15, and the height of the heat conducting plate 31 is slightly smaller than the depth of the water tank 21.
An insulating layer 14 is arranged between the shell and the inner container 15, the thickness of the insulating layer 14 is not less than 5mm, and the insulating layer 14 is made of silicon dioxide aerogel or carbon aerogel. In this embodiment, the thickness of heat preservation is 5mm, is made by thermal-insulated silica aerogel material, and shell and inner bag 15 are made by the stainless steel, and thickness is 3 mm. The sealed tank with the cold source is insulated and heat-preserved, and the sandwich structure can effectively ensure the slow volatilization of the cold source in the tank, so that the consumption of the cold source is less in the freezing casting process, and the cost of the solution freezing casting is obviously reduced.
Referring to fig. 2, the sealed tank 10 includes a tank body 11 with an open top and a sealing cover 12, the tank body 11 and the sealing cover 12 both adopt a sandwich structure, and a second sealing ring 13 is disposed between the tank body 11 and the sealing cover 12.
The present embodiment is implemented as follows: slowly pouring the solution to be frozen into the freezing tank 32; adding tap water into the water tank 21, connecting the heating pipe 22, and setting the heating temperature of the temperature control system 24 to be 80 ℃; after heating for a period of time, the temperature sensor 23 measures the water temperature to be stable at 80 ℃; opening the sealing cover 12, and immediately closing the sealing cover 12 after the tank body 11 is filled with liquid nitrogen; the two legs of the heat conducting plate 31 are respectively clamped into the sockets of the sealing tank 10 and the water tank 31, and then the connection of the device is completed. The heat conducting plate conducts heat in the horizontal direction, the temperature difference between two feet of the heat conducting plate is 276 ℃, the temperature on the heat conducting plate is uniformly distributed between 196 ℃ below zero and 80 ℃, and a temperature gradient is formed to conduct bidirectional freezing casting on the solution in the freezing tank 32.
After the solution in the freezing chamber 32 is completely frozen, the freezing chamber 32 is separated from the heat conductive plate 31 by tapping the freezing chamber 32 using a rubber hammer, and at the same time, the freezing chamber 32 is peeled from the frozen sample. The interior of the freezing tank 32 is wiped clean, and the heat conductive plate 31 is removed. The temperature of the temperature control system 24 is observed and after the indicated temperature has stabilized, the freeze casting of the next sample can begin.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. An apparatus for bi-directional chill casting of a solution with a controlled heat transfer rate, comprising: comprises that
The freezing component comprises a heat conduction plate and a freezing tank for filling freezing solution, and the freezing tank is arranged on the heat conduction plate;
the sealed tank is used for storing a cold source, and one leg of the heat conducting plate is placed into the sealed tank for freeze casting;
the basin jar, another foot of heat-conducting plate is put into in the basin jar to freezing casting is carried out, thereby realizes two-way freezing casting, the basin jar is provided with the unit that generates heat, the unit that generates heat include the heating tube and with the temperature control system that the heating tube electricity is connected, temperature control system is used for control the heating power of heating tube, in order to adjust the temperature of basin jar, thereby adjust the two foot difference in temperature of heat-conducting plate.
2. The apparatus for bi-directional freeze casting of a solution with a controllable heat transfer rate of claim 1, wherein: the heating unit further comprises a temperature sensor arranged in the water tank, and the temperature sensor is electrically connected with the temperature control system to feed back a measured temperature signal to the temperature control system.
3. The apparatus for bi-directional chill casting of a solution with a controlled heat transfer rate of claim 2, wherein: the temperature control system is a PLC temperature control system, and the temperature control system, the temperature sensor and the heating tube are connected in series.
4. The apparatus for bi-directional freeze casting of a solution with controllable heat transfer rate according to any one of claims 1 to 3, wherein: the heat-conducting plate is a bridge-type heat-conducting plate, the heat-conducting plate is a copper plate component or a silver-plated copper plate component, the heat-conducting plate comprises a heat-conducting metal plate and two pins positioned at two ends of the heat-conducting metal plate, and the thickness of the heat-conducting metal plate is not less than 5 mm.
5. The apparatus for bi-directional chill casting of a solution with a controlled heat transfer rate of claim 4, wherein: the seal pot with the basin jar all is provided with the confession the socket that participates in and put into, the socket of seal pot is provided with first sealing washer to prevent that the cold source from leaking from the gap of socket.
6. The apparatus for bi-directional freeze casting of a solution with controllable heat transfer rate according to any one of claims 1 to 3, wherein: the sealed tank adopts sandwich structure, the sealed tank includes shell and inner bag, the shell with be provided with the heat preservation between the inner bag.
7. The apparatus for bi-directional chill casting of a solution with a controlled heat transfer rate of claim 6, wherein: the thickness of heat preservation is not less than 5mm, the material of heat preservation is silica aerogel or carbon aerogel.
8. An apparatus for bi-directional freeze casting of a solution with a controllable heat transfer rate as claimed in claim 6, wherein: the sealed tank comprises a tank body with an open top and a sealed cover, the tank body and the sealed cover both adopt sandwich structures, and a second sealing ring is arranged between the tank body and the sealed cover.
9. The apparatus for bi-directional chill casting of a solution with a controlled heat transfer rate of claim 6, wherein: the height of the heat conducting plate is slightly smaller than the depth of the inner container, and the height of the heat conducting plate is slightly smaller than the depth of the water tank.
10. The apparatus for bi-directional freeze casting of a solution with controllable heat transfer rate according to any one of claims 1 to 3, wherein: the freezing groove is the silicon rubber component, and its wall thickness is not less than 5mm, the heat-conducting plate is provided with the confession the bayonet socket of freezing groove installation, the degree of depth of bayonet socket is not more than 1mm, the width of bayonet socket equals the opening width of freezing groove bottom.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123325934.7U CN216778769U (en) | 2021-12-27 | 2021-12-27 | Heat transfer rate controllable device for performing bidirectional freezing casting on solution |
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| CN202123325934.7U CN216778769U (en) | 2021-12-27 | 2021-12-27 | Heat transfer rate controllable device for performing bidirectional freezing casting on solution |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115572407A (en) * | 2022-09-09 | 2023-01-06 | 天津科技大学 | Aramid nanofiber-based composite aerogel and preparation method and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115572407A (en) * | 2022-09-09 | 2023-01-06 | 天津科技大学 | Aramid nanofiber-based composite aerogel and preparation method and application thereof |
| CN115572407B (en) * | 2022-09-09 | 2023-08-08 | 天津科技大学 | Aramid nanofiber-based composite aerogel and preparation method and application thereof |
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