A cooling device based on frequency conversion control
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-28
- Publication Date
- 2026-08-14
AI Technical Summary
[0003]奶油制备搅拌的过程中，奶油搅拌时，脂肪球碰撞破裂产生机械热，且搅拌环境散热慢，若不制冷，料液温度会快速升至13℃以上，导致脂肪晶体融化、奶油出油，或降至6℃以下致奶油结块，破坏品质，传统制冷用定频压缩机，满负荷运行或频繁启停，弊端是控温精度差（±2℃），易过温或过冷，能耗高，低负荷时浪费能源，还因启停电流冲击大，缩短设备寿命，通常由制冷组件从罐体外向内部换热，内外存在温差，换热效率慢
本实用新型通过制冷器、空心主轴、螺旋制冷管、双密封轴承等结构件的联动，结合变频控制，制冷器输出的冷量经输出管分流，由调节阀一控制，在罐外螺旋制冷管与罐内空心主轴间合理分配冷量，外罩减少冷量损耗，双路径同步换热，解决传统单罐外换热温差大问题，使罐内上中下温度差波动小，大幅提升换热效率，缩短冷却时间；
Smart Images
Figure CN224635701U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cooling device technology, and in particular to a cooling device based on frequency conversion control. Background Technology
[0002] Cream preparation is a sophisticated process involving the separation, crystallization, and texture control of milk fat. Temperature is a key parameter that affects the morphology of fat crystals, microbial safety, and final taste.
[0003] During the mixing process of cream preparation, the collision and rupture of fat globules generate mechanical heat, and the mixing environment dissipates heat slowly. If there is no cooling, the temperature of the liquid will quickly rise above 13°C, causing the fat crystals to melt and the cream to separate, or it will drop below 6°C, causing the cream to clump and ruining its quality. Traditional refrigeration uses fixed-frequency compressors, which operate at full load or frequently start and stop. The disadvantages are poor temperature control accuracy (±2°C), easy overheating or overcooling, high energy consumption, energy waste at low loads, and large start-stop current surges that shorten the equipment's lifespan. Usually, heat exchange is done from the outside of the tank to the inside by refrigeration components, but there is a temperature difference between the inside and outside, resulting in slow heat exchange efficiency. Therefore, those skilled in the art have provided a cooling device based on variable frequency control to solve the problems mentioned in the background art. Utility Model Content
[0004] Technical solution
[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model is a cooling device based on frequency conversion control, including a cooler, a motor, a tank, and a main shaft. The cooler is arranged on one side of the tank, and an output pipe is provided at the output end of the cooler. One end of the output pipe is provided with a spiral-shaped refrigeration pipe that is sleeved on the outside of the tank. One end of the refrigeration pipe is connected to the input end of the cooler. A hollow main shaft is rotatably installed inside the tank. A diverter pipe corresponding to the main shaft is provided on one side of the output pipe. A return pipe connected to the input end of the cooler is provided at the lower end of the main shaft. A control box is arranged on the front side of the tank, and a stirring arm is arranged on the outer wall of the main shaft.
[0006] Furthermore, a regulating valve one is provided at the connection between the shunt pipe and the output pipe, and a regulating valve two is provided at the connection between the return pipe and the input end of the cooler; Specifically, regulating valve one controls the opening degree of the distribution pipe and the output pipe, and distributes the delivered cooling medium to the refrigeration pipe and the main shaft in proportion, while regulating valve two controls the opening and closing of the return pipe.
[0007] Furthermore, a gear ring is sleeved on the outer wall of the upper end of the main shaft, a motor is provided above the tank body, and a gear that meshes with the gear ring is provided at the output end of the motor; Specifically, when the gear rotates, it pushes the gear ring, which in turn drives the main shaft to rotate.
[0008] Furthermore, a support rod is provided at the upper end of the tank body, a support tube is provided at one end of the support rod, a sealed bearing is embedded inside the support tube, the upper end of the main shaft is rotatably installed inside the sealed bearing, and one end of the diversion pipe is connected to the support tube. Specifically, the support rod supports the support tube, and the sealed bearing provides rotational support to the distribution tube and also acts as a seal to prevent the rotational force of the main shaft from acting on the distribution tube.
[0009] Furthermore, a second support pipe is provided inside the lower end of the tank body, and a second sealed bearing is embedded inside the second support pipe. The lower end of the main shaft is rotatably installed inside the second sealed bearing. One end of the return pipe is connected to the second support pipe, and a discharge pipe controlled by a valve is provided at the lower end of the tank body. Specifically, the sealed bearing inside the second support tube provides rotational support to the lower end of the main shaft, and connects the return pipe to the corresponding lower end of the main shaft to ensure effective delivery of the cooling medium without hindering the rotation of the main shaft.
[0010] Furthermore, an outer cover is fitted onto the outside of the tank body and is fitted onto the outside of the refrigeration pipe. A temperature sensor is provided at one end of the outer cover, and the thermocouple end of the temperature sensor is located at three positions inside the tank body: upper, middle, and lower. Specifically, the temperature sensor detects the temperature inside the tank, and the outer cover protects the refrigeration pipes. Beneficial effects
[0011] Compared with existing technologies, the advantages of this utility model are: This utility model, through the linkage of structural components such as the refrigerator, hollow main shaft, spiral refrigeration tube, and double-sealed bearing, combined with frequency conversion control, the cooling output of the refrigerator is split through the output pipe and controlled by regulating valve one, so that the cooling capacity is reasonably distributed between the spiral refrigeration tube outside the tank and the hollow main shaft inside the tank. The outer cover reduces the cooling capacity loss, and the dual-path synchronous heat exchange solves the problem of large temperature difference in traditional single-tank external heat exchange, makes the temperature difference between the upper, middle and lower parts of the tank small, greatly improves the heat exchange efficiency, and shortens the cooling time. Meanwhile, the motor drives the gear meshing ring to rotate the hollow main shaft. Sealed bearings one and two ensure that the cold energy delivery does not leak when the main shaft rotates, achieving synergy between stirring and heat exchange, avoiding uneven local cream temperature, making fat crystallization more uniform, stabilizing cream quality, and improving the pass rate. The control box combines temperature sensor data and adjusts the power of the refrigerator and the valve opening through frequency conversion, supplying cold energy on demand. Under low load, the compressor frequency drops to 15-20Hz, which reduces energy consumption compared to traditional fixed frequency devices and eliminates the current surge from frequent start-stop. With stable linkage of structural components, the lifespan of core components is extended, and annual maintenance costs are reduced, balancing high efficiency, energy saving, and equipment durability.
[0012] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description
[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is a front-view three-dimensional structural diagram of the present invention; Figure 2 This is a side view of the three-dimensional structure of the present invention; Figure 3 This is a schematic diagram of the main sectional three-dimensional structure of this utility model; Figure 4 This is a front-view three-dimensional structural diagram of the spiral tube of this utility model; Figure 5 This is a top-view three-dimensional structural diagram of the gear ring of this utility model.
[0015] The attached diagram lists the components represented by each number as follows: 1. Outer casing; 2. Control box; 3. Refrigerator; 4. Discharge pipe; 5. Temperature sensor; 6. Motor; 7. Support rod; 8. Tank body; 9. Regulating valve one; 10. Diverter pipe; 11. Refrigeration pipe; 12. Stirring arm; 13. Main shaft; 14. Support pipe one; 15. Gear; 16. Regulating valve two; 17. Output pipe; 18. Sealed bearing one; 19. Gear ring; 20. Support pipe two; 21. Return pipe. Detailed Implementation
[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0017] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0018] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.
[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Example
[0020] Please see Figure 1-5 As shown, this embodiment is a cooling device based on frequency conversion control, including a cooler 3, a motor 6, a tank 8 and a main shaft 13. The cooler 3 is provided on one side of the tank 8. The output end of the cooler 3 is provided with an output pipe 17. One end of the output pipe 17 is provided with a spiral-shaped cooling pipe 11 that is sleeved on the outside of the tank 8. One end of the cooling pipe 11 is connected to the input end of the cooler 3. The hollow main shaft 13 is rotatably installed inside the tank 8. A diversion pipe 10 corresponding to the main shaft 13 is provided on one side of the output pipe 17. The lower end of the main shaft 13 is connected to a return pipe 21 that is connected to the input end of the cooler 3. A control box 2 is provided on the front side of the tank 8. A stirring arm 12 is provided on the outer wall of the main shaft 13. A regulating valve 9 is provided at the connection between the branch pipe 10 and the output pipe 17, and a regulating valve 16 is provided at the connection between the return pipe 21 and the input end of the refrigerator 3. A gear ring 19 is sleeved on the outer wall of the upper end of the main shaft 13, and a motor 6 is installed above the tank body 8. A gear 15 that meshes with the gear ring 19 is installed at the output end of the motor 6. A support rod 7 is provided at the upper end of the tank body 8. A support tube 14 is provided at one end of the support rod 7. A sealed bearing 18 is embedded inside the support tube 14. The upper end of the main shaft 13 is rotatably installed inside the sealed bearing 18. One end of the diversion pipe 10 is connected to the support tube 14. A support pipe 20 is installed inside the lower end of the tank body 8. A sealed bearing 2 is embedded inside the support pipe 20. The lower end of the main shaft 13 is rotatably installed inside the sealed bearing 2. One end of the return pipe 21 is connected to the support pipe 20. A discharge pipe 4 controlled by a valve is installed at the lower end of the tank body 8. The outer casing 1 of the tank body 8 is fitted onto the outside of the refrigeration pipe 11. A temperature sensor 5 is installed at one end of the outer casing 1. The thermocouple end of the temperature sensor 5 is located at three positions inside the tank body 8: upper, middle, and lower. Based on the implementation steps of Example 1: After the refrigerator 3 is started, a low-temperature refrigerant medium of about -5°C is delivered through the output pipe 17. One side of the output pipe 17 is connected to the distribution pipe 10, which is equipped with a regulating valve 9. The other side is connected to the refrigerant pipe 11, which is spirally sleeved on the outside of the tank body 8. The control box 2 controls the medium distribution ratio through the regulating valve 9 according to the real-time temperature data. When the temperature of the cream in the tank is too high and reaches the threshold temperature, the opening of the distribution pipe 10 is increased to allow more medium to flow to the main shaft 13 in the tank. When the temperature is close to the target threshold temperature, the opening of the distribution pipe 10 is decreased to increase the proportion of medium in the refrigerant pipe 11 outside the tank, thereby balancing the heat exchange efficiency inside and outside. The medium entering the spiral refrigerant pipe 11 flows along the spiral path outside the tank body 8 and indirectly exchanges heat with the cream in the tank through the pipe wall, taking away the heat of the cream near the tank wall. At the same time, the outer cover 1 sleeved on the outside of the tank body 8 can reduce the heat exchange between the refrigerant pipe 11 and the external environment, avoid cold loss, and ensure stable heat exchange outside the tank. The medium entering the distribution pipe 10 flows into the hollow main shaft 13 through the support pipe 14. Since the main shaft 13 rotates synchronously with the cream stirring, the low-temperature medium inside the hollow main shaft 13 can directly contact the cream in the central area of the tank, solving the problem of the traditional method of heat exchange only outside the tank, which leads to the high temperature in the center of the tank. The medium after heat exchange flows out from the lower end of the main shaft 13, flows into the return pipe 21 through the support pipe 20, and finally flows back to the cooler 3 to cool down again, completing the cycle. The main shaft 13 is not only the internal conveying channel for the refrigerant, but also the core component for cream churning. Its drive and sealing design ensures that churning does not affect the medium conveying, and the conveying does not interfere with churning. A gear ring 19 is sleeved on the upper outer wall of the main shaft 13. The gear 15 at the output end of the motor 6 above the tank 8 meshes with the gear ring 19. After the motor 6 starts, the gear 15 drives the gear ring 19 to rotate, which in turn drives the hollow main shaft 13 to rotate inside the tank. The speed can be adjusted according to the churning requirements, so that cream churning and heat exchange of the medium inside the tank can be carried out simultaneously, avoiding uneven temperature caused by localized stagnation of the cream. A sealed bearing 18 is embedded in the support pipe 14 connected to the upper support rod 7 of the tank body 8. The upper end of the main shaft 13 is rotatably installed in the sealed bearing 18. A sealed bearing 2 is embedded in the support pipe 20 at the lower end of the tank body 8. The lower end of the main shaft 13 is rotatably installed in the sealed bearing 2. The double sealed bearing design provides stable support for the shaft on the one hand, and completely isolates the refrigerant from the outside air on the other hand, preventing the medium from leaking or the outside moisture from entering the tank. At the same time, it avoids the main shaft 13 from causing the diversion pipe 10 and the return pipe 21 to shift when rotating, ensuring the stability of the medium delivery path. The device consists of a closed-loop control system composed of a temperature sensor 5, a control box 2, and a frequency converter. It responds in real time to changes in heat load during the cream mixing process. The temperature sensor 5, located at one end of the outer casing 1, has its thermocouple ends positioned at the top, middle, and bottom of the tank 8. It can simultaneously collect the temperature of cream in different areas and transmit the data to the control box 2 at the front of the tank 8 in real time, avoiding temperature misjudgment caused by single-point monitoring. The control box 2 dynamically adjusts the compressor frequency and valve opening of the refrigerator 3 based on the deviation between the average temperature and the target temperature. When the temperature deviation is large, the control box 2 increases the compressor frequency of the refrigerator 3 to increase the cooling output. At the same time, it opens the regulating valve 9 and the regulating valve 16 to accelerate the medium circulation speed, enhance heat exchange inside and outside the tank, and quickly bring the temperature back to the target range. The control box 2 then reduces the compressor frequency and decreases the opening of the regulating valve 9 to maintain only the basic cooling output, compensate for the mechanical heat generated by mixing, and prevent a sudden drop in temperature. The control box 2 further reduces the compressor frequency and closes the regulating valve 16 to slow down the medium circulation and prevent the cream temperature from dropping below 6°C, which could lead to clumping. Compared to traditional fixed-frequency cooling devices, the variable-frequency control of this device, by adjusting the cooling output on demand, demonstrates significant advantages in terms of temperature control accuracy, energy consumption, equipment lifespan, and adaptability. Traditional fixed-frequency cooling relies on a cycle of "full-load operation-stop-restart," resulting in temperature fluctuations of ±2℃, which can easily lead to the melting or excessive crystallization of butter fat crystals. In contrast, variable-frequency control, by adjusting the compressor frequency and medium flow rate in real time, can control temperature fluctuations within ±0.3℃. During the butter mixing process, even if the mechanical heat suddenly increases, such as the current of the mixing motor 6 rising from 50A to 80A, the control box 2 can respond quickly by increasing the compressor frequency to supplement the cooling capacity. Traditional fixed-frequency cooling operates at full load at 50Hz regardless of the heat load, wasting a lot of energy during low-load phases. Variable-frequency control can dynamically adjust the frequency according to the heat load, with the compressor frequency dropping to 15-20Hz during low loads and rising to 45-48Hz during high loads. Traditional devices rely solely on external coils for heat exchange, resulting in a temperature difference of up to 7°C between the cream in the central area and the tank wall, leading to uneven cooling. This device employs a dual-path system: an external spiral tube and an internal hollow main shaft (13 paths). Combined with frequency conversion to regulate the medium distribution ratio, it can control the temperature difference between the upper and lower layers within the tank to within 0.5°C, completely resolving the issue of excessively high central temperatures. The heat exchange time is significantly reduced compared to traditional methods. Traditional fixed-frequency cooling experiences temperature fluctuations of ±2°C, which can easily lead to excessively high temperatures causing the cream to ooze oil or excessively low temperatures causing the cream to clump. By adjusting the cooling capacity in real time via frequency conversion, combined with three-point temperature monitoring, the temperature fluctuation is reduced to ±0.3°C, ensuring that the cream is always within the optimal stirring temperature range, resulting in uniform fat crystallization and a smooth, grain-free texture.
[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0022] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A cooling device based on frequency conversion control, characterized in that: The device includes a refrigerator (3), a motor (6), a tank (8), and a main shaft (13). The refrigerator (3) is provided on one side of the tank (8). The output end of the refrigerator (3) is provided with an output pipe (17). One end of the output pipe (17) is provided with a spiral-shaped refrigeration pipe (11) that is sleeved on the outside of the tank (8). One end of the refrigeration pipe (11) is connected to the input end of the refrigerator (3). The main shaft (13) with a hollow interior is rotatably installed inside the tank (8). A diversion pipe (10) corresponding to the main shaft (13) is provided on one side of the output pipe (17). The lower end of the main shaft (13) is provided with a return pipe (21) connected to the input end of the refrigerator (3). A control box (2) is provided on the front side of the tank (8). A stirring arm (12) is provided on the outer wall of the main shaft (13).
2. The cooling device based on frequency conversion control according to claim 1, characterized in that: A regulating valve 1 (9) is provided at the connection between the branch pipe (10) and the output pipe (17), and a regulating valve 2 (16) is provided at the connection between the return pipe (21) and the input end of the cooler (3).
3. A cooling device based on frequency conversion control according to claim 1, characterized in that: A gear ring (19) is sleeved on the outer wall of the upper end of the main shaft (13), and a motor (6) is provided above the tank body (8). A gear (15) that meshes with the gear ring (19) is provided at the output end of the motor (6).
4. A cooling device based on frequency conversion control according to claim 1, characterized in that: The upper end of the tank (8) is provided with a support rod (7), and one end of the support rod (7) is provided with a support tube (14). A sealed bearing (18) is embedded inside the support tube (14). The upper end of the main shaft (13) is rotatably installed inside the sealed bearing (18). One end of the diversion pipe (10) is connected to the support tube (14).
5. A cooling device based on frequency conversion control according to claim 1, characterized in that: The lower end of the tank (8) is provided with a support pipe (20), and a sealed bearing (2) is embedded inside the support pipe (20). The lower end of the main shaft (13) is rotatably installed inside the sealed bearing (2). One end of the return pipe (21) is connected to the support pipe (20). The lower end of the tank (8) is provided with a discharge pipe (4) controlled by a valve.
6. A cooling device based on frequency conversion control according to claim 1, characterized in that: The outer side of the tank (8) is fitted with an outer cover (1) that is fitted to the outside of the refrigeration pipe (11). A temperature sensor (5) is provided at one end of the outer cover (1). The thermocouple end of the temperature sensor (5) is located at the upper, middle and lower positions inside the tank (8).