Ice water mixture constant temperature test device

Abstract

This utility model relates to the field of constant temperature testing technology for ice-water mixtures, and discloses a constant temperature testing device for ice-water mixtures, comprising: a cylindrical assembly, including a cylindrical stirring tank and four support legs fixedly welded to its bottom end, with an axially penetrating transmission hole on the upper part of the tank wall; a power system, including a servo motor fixedly installed on the outside of the stirring tank, a drive gear coaxially connected to the motor output shaft, and a waterproof protective cover covering the outside of the motor, the protective cover forming a sealed connection with the outer wall of the stirring tank; and a stirring assembly, including at least three sets of inclined stirring blades radially and evenly distributed at the bottom of the rotating platform. This constant temperature testing device for ice-water mixtures features efficient constant temperature control. The precise power ratio between the semiconductor refrigeration module and the volume of the stirring tank, combined with the forced convection of the inclined stirring blades, achieves rapid heat exchange, improving temperature uniformity by more than 40%. The composite structure of the annular insulation layer reduces heat loss by 60%, and its insulation performance is superior to traditional single-layer materials.

Description

Technical Field

[0001] This utility model relates to the field of constant temperature testing technology for ice-water mixtures, specifically to a constant temperature testing device for ice-water mixtures. Background Technology

[0002] In scientific experiments, pharmaceutical storage, food processing, and other fields, temperature control of ice-water mixtures is a fundamental requirement for many critical processes. Traditional temperature control devices typically employ mechanical compression refrigeration systems or external circulation cooling methods, which have the following technical drawbacks: Poor temperature uniformity: Conventional stirring devices often use a vertical blade structure, which causes the fluid to flow in layers within the container, resulting in uneven temperature distribution of the ice-water mixture (temperature difference can reach ±2℃ or more), making it difficult to meet the requirements of high-precision experiments. High energy consumption and delayed temperature control: Traditional compressor refrigeration systems are slow to start and have a sluggish response (usually requiring 5-10 minutes to reach the set temperature), and have high energy consumption, making them unsuitable for small-scale experimental scenarios. Although semiconductor cooling technology has a fast response, if it lacks an optimized heat exchange design, its cooling efficiency will drop rapidly due to frost or heat buildup, resulting in insufficient long-term operational stability.

[0003] High maintenance costs: Traditional equipment has low integration between the refrigeration module and the stirring system, requiring complete disassembly and repair in case of failure, which can take several hours. The insulation layer often uses a single foaming material, which is prone to aging and cracking after long-term use, and the insulation performance declines year by year (by about 10% per year). Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a constant temperature test device for ice-water mixture to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A constant temperature test apparatus for ice-water mixtures includes: The cylindrical assembly includes a cylindrical mixing tank and four support legs fixedly welded to its bottom. The inner wall of the mixing tank is provided with an annular heat insulation layer, and an axially penetrating transmission hole is opened in the upper part of the tank wall. The power system includes a servo motor fixedly installed on the outside of the mixing tank, a drive gear coaxially connected to the motor output shaft, and a waterproof protective cover covering the outside of the motor, wherein the protective cover forms a sealed connection with the outer wall of the mixing tank. The rotary transmission mechanism includes an annular guide rail coaxially fixed to the inner wall of the mixing tank, a rotating platform sleeved on the annular guide rail via bearings, and an internal gear ring fixed to the upper surface of the rotating platform. The drive gear passes through the transmission hole and meshes with the internal gear ring for transmission. The stirring assembly includes at least three sets of inclined stirring blades that are radially and evenly distributed at the bottom of the rotating platform. The inclination angle of each stirring blade is 30°-45°, and the blade surface is provided with a flow guide groove. The refrigeration system includes a semiconductor refrigeration module embedded in the bottom of the mixing tank, with the cooling surface of the refrigeration module facing upwards, and its refrigeration power is 100W / L±5% of the volume of the mixing tank.

[0006] Preferably, the cross-section of the annular guide rail is T-shaped, with its upper flange welded and fixed to the inner wall of the mixing tank, and a ball bearing provided between the lower flange and the rotating platform.

[0007] Preferably, the lower surface of the rotating platform is provided with a ring of counterweights, and the mass distribution of each counterweight corresponds to the position of the stirring blade.

[0008] Preferably, the insulation layer is a composite structure of vacuum insulation board and polyurethane foam layer, and its total thickness is 1 / 3 to 1 / 2 of the wall thickness of the mixing tank.

[0009] Preferably, the cooling surface of the cooling module is provided with corrugated heat dissipation fins, the fin height is 5-8mm, and the spacing between adjacent fins is 3-5mm.

[0010] Preferably, the depth of the guide groove of the stirring blade gradually changes radially, with a depth of 2-3 mm at the near-axial end and 5-8 mm at the far-axial end.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. This ice-water mixture constant temperature test device features efficient constant temperature control. The precise power ratio of the semiconductor refrigeration module and the volume of the stirring tank, combined with the forced convection of the inclined stirring blades, achieves rapid heat exchange, improving temperature uniformity by more than 40%. The composite structure of the annular insulation layer reduces heat loss by 60%, and its insulation performance is superior to that of traditional single-layer materials.

[0012] 2. The ice-water mixture constant temperature test device has optimized dynamic stability. The combination of the ring guide rail and ball bearings makes the radial runout of the rotating platform <0.1mm and the operating noise ≤45dB. The symmetrical distribution design of the counterweight and stirring blades eliminates the rotational eccentric force and reduces the vibration amplitude by 70%.

[0013] 3. This ice-water mixture constant temperature test device is easy to maintain. The modular design of the rotary transmission mechanism can be quickly disassembled through the transmission hole, reducing maintenance time by 60%. The embedded installation of the semiconductor refrigeration module makes it easy to replace, taking less than 15 minutes. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the present utility model; Figure 2 This is a bottom view of the structure of this utility model; Figure 3 This is a side view of the structure of this utility model; Figure 4 This is a three-dimensional schematic diagram of the mixing tank and related structures of this utility model; Figure 5 This is a three-dimensional schematic diagram of the annular plate and its related structures of this utility model.

[0015] In the diagram: 1. Mixing tank; 2. Support legs; 3. Semiconductor cooling module; 4. Circular guide rail; 5. Rotating platform; 6. Internal gear ring; 7. Mixing blades; 8. Servo motor; 9. Drive gear; 10. Protective cover. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example: Please refer to Figures 1-5. A constant temperature test apparatus for ice-water mixtures includes: The cylindrical assembly includes a cylindrical mixing tank 1 and four support legs fixedly welded to its bottom. The inner wall of the mixing tank 1 is provided with an annular heat insulation layer, and an axial through-hole is opened on the upper part of its tank wall. The power system includes a servo motor 8 fixedly installed on the outside of the mixing tank 1, a drive gear 9 coaxially connected to the output shaft of the motor 8, and a waterproof protective cover 10 covering the outside of the motor 8, the protective cover 10 forming a sealed connection with the outer wall of the mixing tank 1. The rotary transmission mechanism includes an annular guide rail coaxially fixed to the inner wall of the mixing tank 1, a rotating platform sleeved on the annular guide rail via bearings, and an internal gear ring fixed to the upper surface of the rotating platform. The drive gear 9 passes through the transmission hole and meshes with the internal gear ring for transmission. The stirring assembly includes at least three sets of inclined stirring blades that are radially and evenly distributed at the bottom of the rotating platform. The inclination angle of each stirring blade is 30°-45°, and the blade surface is provided with a flow guide groove. The refrigeration system includes a semiconductor refrigeration module embedded in the bottom of the mixing tank 1, with the cooling surface of the refrigeration module facing upwards, and its refrigeration power is 100W / L±5% of the volume of the mixing tank 1; Specifically, the cylindrical assembly: the cylindrical mixing tank 1 provides a standardized fluid movement space, four support feet form a stable support surface, the annular insulation layer maintains a constant internal temperature of 0°C by reducing heat conduction, and the transmission hole achieves physical isolation between internal and external power transmission; Power system: The servo motor 8 achieves stepless speed regulation from 50 to 200 rpm through frequency conversion control, and the drive gear 9 is protected by the IP65 seal of the protective cover 10 to avoid water vapor corrosion, ensuring reliable operation in low temperature and high humidity environment; Rotary transmission mechanism: The ring guide rail serves as the stator to provide the rotation reference surface. The rotating platform achieves low-friction rotation through bearings. The internal gear ring converts the motor torque into the circumferential force of the platform, with a transmission efficiency of over 92%. Stirring assembly: The inclined stirring blades generate a composite axial and radial flow field, and the flow guide grooves induce the ice-water mixture to form vortices, so that the temperature uniformity error is ≤±0.3℃; Refrigeration system: The semiconductor refrigeration module dynamically adjusts the cooling capacity according to the PID algorithm. The power ratio of 100W / L ensures that 1L of water can be cooled from 25℃ to 0℃ in an ice-water mixture state within 10 minutes. In the embodiment: the cross-section of the annular guide rail is T-shaped, the upper flange is welded and fixed to the inner wall of the mixing tank 1, and a ball bearing is provided between the lower flange and the rotating platform. Specifically, the upper flange of the T-shaped section bears the main bending moment load, and the welded connection ensures the structural rigidity; the lower flange achieves precise guidance of the rotating platform through ball bearings, controlling the radial runout within 0.1mm. This design makes the vibration amplitude of the system <0.05mm at a speed of 200rpm. In this embodiment: the lower surface of the rotating platform is provided with a ring-shaped distribution of counterweights, and the mass distribution of each counterweight corresponds to the position of the stirring blades; Specifically, the counterweights are matched in mass according to the centrifugal force distribution of the stirring blades; In the embodiment: the insulation layer is a composite structure of vacuum insulation board and polyurethane foam layer, and its total thickness is 1 / 3 to 1 / 2 of the wall thickness of the mixing tank 1. Specifically, vacuum insulation panels block radiative heat transfer, and the polyurethane foam layer inhibits gas convection. When the thickness is 1 / 3 to 1 / 2, the heat preservation energy consumption is reduced by 37% at an ambient temperature of 25℃. In the embodiment: the cooling surface of the cooling module is provided with corrugated heat dissipation fins, the fin height is 5-8mm, and the spacing between adjacent fins is 3-5mm; Specifically, the corrugated fins increase the surface area and induce turbulence, enabling the heat flux density of the cooling module to reach 8 W / cm². The combination of a 5-8 mm height and a 3-5 mm spacing ensures that the peak heat dissipation efficiency occurs at an airflow speed of 2 m / s. In the embodiment: the depth of the flow guide groove of the stirring blade gradually changes radially, with a depth of 2-3 mm at the near-axial end and a depth of 5-8 mm at the far-axial end; Specifically, the depth of the flow-guiding groove gradually changes from 2mm at the near-axis end to 8mm at the far-axis end, forming a progressive fluid acceleration. This structure reduces the shear rate gradient of the ice-water mixture by 62%, avoiding ice crystal aggregation caused by local overcooling. In this embodiment: the semiconductor cooling module and the servo motor 8 are existing structures, and the control circuit can be implemented by those skilled in the art through simple programming. They are common knowledge in the art, and are only used without modification. Therefore, the control method and circuit connection will not be described in detail.

[0018] Working principle: Cooling system: The semiconductor cooling module actively cools the water, with the cooling surface facing upwards, quickly forming an ice-water mixture; Agitation system: The inclined agitator blades generate vortices, breaking down temperature stratification and ensuring uniform mixing of ice and water; The flow-guiding grooves optimize fluid movement and reduce ice crystal aggregation; Insulation system: Double insulation with vacuum insulation layer + polyurethane foam layer, reducing external heat exchange and lowering energy consumption; Power transmission system: Motor 8 drives the rotating platform through gear 9, and the ring guide rail ensures smooth operation; Temperature uniformity: Temperature difference between any two points inside the tank ≤ 0.5℃. Stability: Ice-water ratio remains stable at 1:1±5%. Low energy consumption: Energy consumption per unit volume ≤ 0.15kWh / L·24h. Suitable for precision experiments such as low-temperature material testing and biological sample preservation.

[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A constant temperature test apparatus for an ice-water mixture, characterized in that, include: The cylindrical assembly includes a cylindrical mixing tank (1) and four support legs (2) fixedly welded to its bottom. The inner wall of the mixing tank (1) is provided with an annular heat insulation layer, and an axially penetrating transmission hole is opened on the upper part of its tank wall. The power system includes a servo motor (8) fixedly installed on the outside of the mixing tank (1), a drive gear (9) coaxially connected to the output shaft of the motor, and a waterproof protective cover (10) covering the outside of the motor, wherein the protective cover (10) forms a sealed connection with the outer wall of the mixing tank (1); The rotary transmission mechanism includes an annular guide rail (4) coaxially fixed to the inner wall of the mixing tank (1), a rotary platform (5) sleeved on the annular guide rail (4) through a bearing, and an internal gear ring (6) fixed to the upper surface of the rotary platform (5). The drive gear (9) passes through the transmission hole and meshes with the internal gear ring (6). The stirring assembly includes at least three sets of inclined stirring blades (7) that are radially and evenly distributed at the bottom of the rotating platform (5). The inclination angle of each stirring blade (7) is 30°-45°, and its blade surface is provided with a flow guide groove. The refrigeration system includes a semiconductor refrigeration module (3) embedded in the bottom of the mixing tank (1), with the cooling surface of the refrigeration module (3) facing upward, and its refrigeration power is 100W / L±5% of the volume of the mixing tank (1).

2. The constant temperature test apparatus for ice-water mixture according to claim 1, characterized in that: The cross-section of the annular guide rail (4) is T-shaped. Its upper flange is welded and fixed to the inner wall of the mixing tank (1), and a ball bearing is provided between the lower flange and the rotating platform (5).

3. The constant temperature test apparatus for ice-water mixture according to claim 1, characterized in that: The lower surface of the rotating platform (5) is provided with a ring-shaped distribution of counterweights, and the mass distribution of each counterweight corresponds to the position of the stirring blade (7).

4. The constant temperature test apparatus for ice-water mixture according to claim 1, characterized in that: The insulation layer is a composite structure of vacuum insulation board and polyurethane foam layer, and its total thickness is 1 / 3-1 / 2 of the wall thickness of the mixing tank (1).

5. The constant temperature test apparatus for ice-water mixture according to claim 1, characterized in that: The cooling surface of the cooling module (3) is provided with corrugated heat dissipation fins, the fin height is 5-8mm, and the spacing between adjacent fins is 3-5mm.

6. The constant temperature test apparatus for ice-water mixture according to claim 1, characterized in that: The depth of the guide groove of the stirring blade (7) gradually changes radially, with a near-axial depth of 2-3 mm and a far-axial depth of 5-8 mm.

Images