A cryogenic cooling bath

Abstract

The application discloses a low-temperature cooling tank, which comprises a cabinet body, a heat-conducting medium circulation pipeline, a plate heat exchanger, a water tank, a compressor and a condenser.

Description

Technical Field

[0001] This application relates to a low-temperature cooling tank, belonging to the field of pharmaceutical equipment manufacturing technology. Background Technology

[0002] A cryogenic cooling bath is a device used to provide a low-temperature experimental environment or cooling function. It utilizes active cooling technology to provide stable and controllable low-temperature conditions for experiments, production, or testing. Widely used in scientific research, industry, and medical fields, its application scenarios are expanding from traditional laboratories to high-precision fields such as intelligent manufacturing and biomedicine, making it an indispensable tool in cryogenic technology.

[0003] Some devices lack an effective pressure regulation mechanism. When the heat transfer medium expands or contracts due to temperature changes, the system pressure fluctuates greatly, which can easily damage the equipment and affect the service life and stability of the device.

[0004] Therefore, the inventors proposed a low-temperature cooling tank that can effectively solve the above problems. Summary of the Invention

[0005] The purpose of this application is to provide a relatively compact structure that solves the problem that when the heat transfer medium in a low-temperature cooling tank expands or contracts due to temperature changes, the system pressure fluctuates greatly, which can easily damage the equipment and affect the service life and stability of the device.

[0006] The technical problem to be solved in this application is achieved by the following technical solution: A low-temperature cooling bath, comprising: The cabinet is divided into a first layer and a second layer from bottom to top. A heat transfer medium circulation pipeline is installed inside the cabinet, and the heat transfer medium circulation pipeline is provided with a heat transfer medium outlet and a heat transfer medium inlet. A circulation pump is connected to the heat transfer medium circulation pipeline, and the circulation pump is installed on the first layer. A temperature sensor is installed on the heat transfer medium circulation pipeline near the heat transfer medium outlet. A plate heat exchanger is installed on the second layer and is connected to the heat transfer medium circulation pipeline; A water tank, installed on the second layer and connected to the heat transfer medium circulation pipeline via a return pipe, is used to accommodate the volume expansion of the heat transfer medium due to temperature changes, while stabilizing the system pressure. The compressor is installed on the first layer and is connected to the plate heat exchanger via copper pipes; A condenser is installed on the first layer and is connected to the compressor via copper pipes. The condenser is also connected to the plate heat exchanger via pipes.

[0007] Preferably, a dryer filter is installed in the pipeline between the condenser and the plate heat exchanger to remove moisture and impurities from the refrigerant, prevent ice blockage and dirt blockage in the system, thereby ensuring stable operation of the equipment and extending its service life.

[0008] Preferably, the dryer filter and the plate heat exchanger are connected by a capillary tube.

[0009] Preferably, the capillary is a throttling and pressure-reducing spiral capillary to reduce pressure fluctuations during refrigerant flow.

[0010] Preferably, the condenser comprises: The condenser housing is fixedly connected to the first layer; The heat exchange copper tubes are arranged in multiple parallel and meandering patterns inside the condenser shell. Each group of heat exchange copper tubes consists of multiple continuous U-shaped bends and straight sections that alternate. The U-shaped bends change the direction of the copper tubes, while the straight sections maintain a relatively straight extension. Multiple groups of copper tubes are arranged side by side to increase the heat exchange area. A cooling fan is mounted on the housing.

[0011] Preferably, the heat transfer medium circulation pipeline is connected to an exhaust pipe, the exhaust pipe passes through the outer shell of the water tank and extends into the water tank, and an exhaust valve is installed on the water tank.

[0012] Preferably, the water tank is connected to a drain pipe.

[0013] Preferably, a level gauge is installed on the water tank so that the liquid level in the water tank can be observed in real time, and the cabinet is provided with an observation port.

[0014] Preferably, ventilation mesh structures are installed on all four sides of the first layer of the cabinet. The ventilation mesh structures consist of mesh-like holes to further increase airflow.

[0015] Preferably, casters are installed at all four corners of the bottom of the cabinet.

[0016] The beneficial effects of this application are: 1. This application uses a water tank installed inside the cabinet and connected to the heat transfer medium circulation pipeline via a return pipe. This tank accommodates the volume expansion of the heat transfer medium due to temperature changes and stabilizes the system pressure. When the temperature of the heat transfer medium in the circulation pipeline is too high, the heat transfer medium expands due to heat and flows to the water tank through the return pipe. When the temperature in the heat transfer medium circulation pipeline decreases and the heat transfer medium in the circulation pipeline is insufficient, the water tank replenishes the heat transfer medium to the circulation pipeline through the return pipe.

[0017] 2. This application includes a dryer filter installed in the pipeline between the condenser and the plate heat exchanger; this is to remove moisture and impurities from the refrigerant, prevent ice blockage and dirt blockage in the system, thereby ensuring stable operation of the equipment and extending its service life.

[0018] 3. In this application, the heat exchange copper tubes are arranged in multiple parallel and meandering patterns inside the condenser shell. Each group of heat exchange copper tubes consists of multiple continuous U-shaped bends and straight sections that alternate. The U-shaped bends change the direction of the copper tubes, while the straight sections maintain a relatively straight extension. Multiple groups of copper tubes are arranged side by side to increase the heat exchange area.

[0019] 4. This application divides the cabinet interior into a first layer and a second layer from bottom to top to increase the installation space of the cabinet, thereby reducing the floor area occupied by the cabinet. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present application; Figure 2 This is a schematic diagram of the internal structure of this application. Figure 1 ; Figure 3 This is a schematic diagram of the internal structure of this application. Figure 2 ; Figure 4 This is a schematic diagram of the internal structure of this application. Figure 3 ; Figure 5 This is a schematic diagram of the condenser of this application.

[0021] In the diagram: 1. Cabinet; 101. First layer; 102. Second layer; 103. Ventilation mesh structure; 104. Fuma wheel; 2. Control cabinet; 3. Heat transfer medium circulation pipeline; 301. Heat transfer medium outlet; 302. Heat transfer medium inlet; 4. Circulation pump; 5. Plate heat exchanger; 6. Water tank; 7. Compressor; 8. Condenser; 801. Condenser shell; 802. Heat exchange copper tube; 803. Cooling fan; 9. Dryer filter; 10. Capillary tube; 11. Return pipe; 12. Exhaust pipe; 13. Drain pipe; 14. Level gauge; 15. Temperature sensor. Detailed Implementation

[0022] To facilitate a clear understanding of the technical means, creative features, objectives, and effects of this application, the following description, in conjunction with specific illustrations, further elaborates on this application.

[0023] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following disclosure provides numerous different embodiments or examples for implementing various structures of the embodiments of this application. To simplify the disclosure of the embodiments of this application, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of this application; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in the embodiments of this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0027] like Figures 1-5 As shown, a low-temperature cooling tank includes: a cabinet 1, a heat transfer medium circulation pipeline 3, a circulation pump 4, a plate heat exchanger 5, a water tank 6, a compressor 7, and a condenser 8.

[0028] Specifically, the cabinet 1 is internally divided into a first layer 101 and a second layer 102 from bottom to top to increase the installation space of the cabinet 1 and thus reduce its floor area. For easy equipment transfer, casters 104 are installed at the four corners of the bottom of the cabinet 1. Ventilation mesh structures 103 are installed on all four sides of the first layer 101 of the cabinet 1. These ventilation mesh structures 103 consist of a grid of holes to further increase airflow. A control cabinet 2 is also installed on the cabinet 1. The control cabinet 2 is a Siemens PLC control cabinet 2 manufactured by Dongguan Xiangke Intelligent Control Equipment Co., Ltd., which houses a PLC control unit. Its specific structure, connection, and operating principle are not detailed here. The PLC control unit inside the control cabinet 2 is electrically connected to the compressor 7, the circulating pump 4, the temperature sensor 15, and the cooling fan 803 in the condenser 8.

[0029] The heat transfer medium circulation pipeline 3 is installed inside the cabinet 1, and the heat transfer medium circulation pipeline 3 is provided with a heat transfer medium outlet 301 and a heat transfer medium inlet 302. The heat transfer medium outlet 301 and the heat transfer medium inlet 302 penetrate the side wall of the cabinet 1 and extend to the outside of the cabinet 1. Both the heat transfer medium outlet 301 and the heat transfer medium inlet 302 are provided with external thread structures. The external thread structures are used to install manual ball valves or solenoid valves. In use, the heat transfer medium outlet 301 and the heat transfer medium inlet 302 are connected to the pipeline of the equipment to be cooled. A closed circulation pipeline is formed; a circulation pump 4 is connected to the heat transfer medium circulation pipeline 3, and the circulation pump 4 is installed on the first layer 101 of the cabinet 1; a temperature sensor 15, which is a platinum resistance thermometer, is installed on the heat transfer medium circulation pipeline 3 near the heat transfer medium outlet 301; the plate heat exchanger 5 is installed on the second layer 102 and is connected to the heat transfer medium circulation pipeline 3; the plate heat exchanger 5 is existing technology, such as the plate heat exchanger 5 produced by Shanghai Exxon New Technology Co., Ltd., and its specific structure will not be described in detail.

[0030] The water tank 6 is installed on the second layer 102 and is connected to the heat transfer medium circulation pipeline 3 through the return pipe 11. It is used to accommodate the volume expansion of the heat transfer medium due to temperature changes and to stabilize the system pressure. When the temperature of the heat transfer medium in the heat transfer medium circulation pipeline 3 is too high, the heat transfer medium expands due to heat and flows to the water tank 6 through the return pipe 11. When the temperature in the heat transfer medium circulation pipeline 3 decreases and the heat transfer medium in the heat transfer medium circulation pipeline 3 is insufficient, the heat transfer medium in the water tank 6 replenishes the heat transfer medium circulation pipeline 3 through the return pipe 11.

[0031] The compressor 7 is installed on the first layer 101, and its inlet is connected to the outlet of the plate heat exchanger 5 at low temperature via a copper pipe. The compressor 7 in this application is prior art, such as a 3-horsepower rotary air conditioner compressor 7 from Panasonic, which is the power source for the refrigerant circulation system. The condenser 8 is installed on the first layer 101 and is connected to the outlet of the compressor 7 via a copper pipe. The condenser 8 is also connected to the plate heat exchanger 5 via a pipeline.

[0032] Furthermore, a dryer filter 9 is installed in the pipeline between the condenser 8 and the plate heat exchanger 5 to remove moisture and impurities from the refrigerant, prevent system ice blockage and dirt blockage, thereby ensuring stable equipment operation and extending service life. The dryer filter 9 is connected to the plate heat exchanger 5 via a capillary tube 10. Preferably, the capillary tube 10 is a throttling and pressure-reducing spiral capillary tube 10 to reduce pressure fluctuations during refrigerant flow. The refrigerant in this application is either Freon or ammonia.

[0033] Further, the condenser 8 includes: a condenser shell 801, which is fixedly connected to the first layer 101; heat exchange copper tubes 802, which are arranged in multiple parallel and meandering patterns inside the condenser shell 801. Each group of heat exchange copper tubes 802 consists of multiple continuous U-shaped bends and straight sections alternating. The U-shaped bends change the direction of the copper tubes, while the straight sections maintain a relatively straight extension. Multiple groups of copper tubes are arranged side by side to increase the heat exchange area; and a cooling fan 803, which is installed on the shell.

[0034] Furthermore, the heat transfer medium circulation pipeline 3 is connected to an exhaust pipe 12, which penetrates the outer shell of the water tank 6 and extends into the water tank 6. An exhaust valve is installed on the water tank 6. Air and other non-condensable gases have low thermal conductivity, and their presence increases the thermal resistance within the heat exchanger, reducing heat exchange efficiency. The exhaust pipe 12 can remove air and non-condensable gases, maintain stable system pressure, prevent oxidation and corrosion, improve system reliability, and optimize system performance.

[0035] Furthermore, a drain pipe 13 is connected to the water tank 6. The drain pipe 13 penetrates the cabinet 1 and extends outside the cabinet 1. The drain pipe 13 has an external thread structure for installing a manual ball valve. The functions of the drain pipe 13 are as follows: 1. Regular cleaning and maintenance of the water tank 6 is an important measure to maintain its normal operation and extend its service life. The drain pipe 13 can easily drain the liquid in the water tank 6 for cleaning, inspection, or maintenance. 2. Under certain specific working conditions, such as system debugging, fault diagnosis, or special operating requirements, it may be necessary to quickly drain the liquid in the water tank 6. The drain pipe 13 can meet these special needs and improve the flexibility and adaptability of the system. A level gauge 14 is installed on the water tank 6 so that the liquid level in the water tank 6 can be observed in real time. The cabinet 1 is provided with an observation port. The water tank 6 is also provided with a replenishment port, which is screwed and fixed with a sealing cap.

[0036] Working principle: The cryogenic cooling bath achieves its cooling function through a refrigeration cycle and heat exchange process. The specific steps are as follows: 1. Refrigeration cycle process 1.1 Compression stage: Compressor 7 draws in low-temperature, low-pressure refrigerant gas and compresses it into high-temperature, high-pressure gas, resulting in a significant increase in temperature and pressure.

[0037] 1.2 Condensation stage: High-temperature and high-pressure gas enters the condenser 8, is cooled by the cooling fan 803, and gradually condenses into a high-pressure liquid, releasing a large amount of heat at the same time.

[0038] 1.3 Throttling stage: High-pressure liquid enters the low-temperature side of plate heat exchanger 5 through spiral capillary tube 10. The pressure drops sharply, causing some liquid to vaporize and form low-temperature, low-pressure wet steam.

[0039] 1.4 Evaporation stage: Low-temperature and low-pressure wet steam absorbs heat on the low-temperature side of plate heat exchanger 5 and is completely vaporized into low-temperature and low-pressure gas, which is then drawn into compressor 7 to complete the cycle.

[0040] 2. Heat exchange process 2.1 Function of Plate Heat Exchanger 5: The high-temperature heat transfer medium in the equipment to be cooled enters the high-temperature side of the plate heat exchanger 5 and exchanges heat with the refrigerant on the low-temperature side through the plates. After absorbing heat, the refrigerant vaporizes, and the high-temperature fluid is cooled to the target temperature.

[0041] 2.2 Function of circulating pump 4: Circulating pump 4 draws the cooled heat transfer medium from the high-temperature side outlet of plate heat exchanger 5 and transports it back to the equipment that needs to be cooled, forming a continuous cycle.

[0042] 3. Temperature control 3.1 Temperature monitoring: Temperature sensor 15 monitors the temperature at the outlet 301 of the heat transfer medium in the heat transfer medium circulation pipeline 3 in real time, and transmits the temperature signal to the PLC control unit for comparison with the preset value.

[0043] 3.2 Refrigeration Cycle Start and Stop: When the temperature is higher than the preset value, the PLC control unit outputs a start command signal to start the compressor 7 and the cooling fan 803, and the refrigeration cycle begins; when the temperature is lower than the preset value, the PLC control unit sends a stop command signal to the compressor 7 and the cooling fan 803, the compressor 7 and the cooling fan 803 stop working, and the refrigeration cycle is paused.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of this application; all such changes and modifications fall within the scope of the claims. The scope of protection of this application is defined by the appended claims and their equivalents.

Claims

1. A cryogenic cooling bath characterized by, include: The cabinet is divided into a first layer and a second layer from bottom to top. A heat transfer medium circulation pipeline is installed inside the cabinet, and the heat transfer medium circulation pipeline is provided with a heat transfer medium outlet and a heat transfer medium inlet. A circulation pump is connected to the heat transfer medium circulation pipeline, and the circulation pump is installed on the first layer. A temperature sensor is installed on the heat transfer medium circulation pipeline near the outlet of the heat transfer medium. A plate heat exchanger is installed on the second layer and is connected to the heat transfer medium circulation pipeline; A water tank, installed on the second layer and connected to the heat transfer medium circulation pipeline via a return pipe, is used to accommodate the volume expansion of the heat transfer medium due to temperature changes, while stabilizing the system pressure. The compressor is installed on the first layer and is connected to the plate heat exchanger via copper pipes; A condenser is installed on the first layer and is connected to the compressor via copper pipes. The condenser is also connected to the plate heat exchanger via pipes.

2. A cryogenic cooling bath according to claim 1, wherein: A dryer filter is installed in the pipeline between the condenser and the plate heat exchanger to remove moisture and impurities from the refrigerant, prevent ice blockage and dirt blockage in the system, thereby ensuring stable operation of the equipment and extending its service life.

3. A cryogenic cooling bath according to claim 2, wherein: The dryer filter and the plate heat exchanger are connected by a capillary tube.

4. A cryogenic cooling bath according to claim 3, wherein: The capillary tube is a throttling and pressure-reducing spiral capillary tube to reduce pressure fluctuations during refrigerant flow.

5. A low-temperature cooling tank according to claim 1 or 4, characterized in that: The condenser includes: The condenser housing is fixedly connected to the first layer; The heat exchange copper tubes are arranged in multiple parallel and meandering patterns inside the condenser shell. Each group of heat exchange copper tubes consists of multiple continuous U-shaped bends and straight sections that alternate. The U-shaped bends change the direction of the copper tubes, while the straight sections maintain a relatively straight extension. Multiple groups of copper tubes are arranged side by side to increase the heat exchange area. A cooling fan is mounted on the housing.

6. A low-temperature cooling tank according to claim 5, characterized in that: The heat transfer medium circulation pipeline is connected to an exhaust pipe, which penetrates the outer shell of the water tank and extends into the water tank. An exhaust valve is installed on the water tank.

7. A cryogenic cooling bath according to claim 6, wherein: The water tank is connected to a drain pipe.

8. A cryogenic cooling bath according to claim 7, wherein: The water tank is equipped with a level gauge so that the liquid level in the tank can be observed in real time, and the cabinet is provided with an observation port.

9. A low-temperature cooling tank according to claim 8, characterized in that: The first layer of the cabinet is equipped with a ventilation mesh structure on all four sides. The ventilation mesh structure consists of a grid of holes to further increase airflow.

10. A cryogenic cooling bath according to claim 9, wherein: The cabinet is equipped with casters at all four corners of its bottom.

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