An air-conditioned fresh-keeping cabinet

Abstract

The utility model relates to a kind of air-conditioning fresh-keeping cabinet, including cabinet, integrated control box and refrigerating unit, still including gas control assembly, temperature detection component, humidity control assembly and disinfection component;Integrated control box is fixed to the outside wall of cabinet, integrated control box inside is equipped with PLC controller, analog input module and multiple relays, gas control assembly includes oxygen sensor, carbon dioxide sensor and gas regulating module, temperature detection component includes PT100 temperature sensor, refrigerating unit is connected with PLC controller communication by relay;Humidity control assembly includes humidifier, disinfection component includes purple light and mounting bracket.The utility model sets up gas control assembly to control cabinet inside gas environment in combination with PLC controller, set temperature detection component, humidity control assembly and disinfection component make humidity and temperature adjustable in combination with PLC controller, disinfection component effectively kills bacteria in fresh-keeping cabinet.

Description

Technical Field

[0001] This utility model relates to the field of preservation equipment technology, specifically to a modified atmosphere preservation cabinet. Background Technology

[0002] In the field of meat preservation, maintaining the freshness and quality of meat has always been a key objective pursued by the industry. Traditional meat preservation methods have many limitations and are difficult to meet the high standards of meat preservation required by the modern market. Conventional refrigeration is a common method of meat preservation, primarily relying on lowering the temperature to slow microbial growth and reduce spoilage. However, this method only controls temperature and cannot effectively regulate the gas composition of the storage environment. During storage, meat's respiration and microbial metabolic activities gradually decrease the oxygen content and increase the carbon dioxide content in the surrounding environment. Both excessively low oxygen and excessively high carbon dioxide levels negatively impact the color, flavor, and nutritional components of the meat. For example, a low-oxygen environment may cause the meat to darken, while a high-carbon dioxide environment may impart off-flavors. These changes not only affect the appearance and taste of the meat but also reduce its market value.

[0003] Temperature fluctuations can accelerate meat spoilage, while improper humidity control can lead to dehydration or mold growth on the surface. Therefore, meat preservation is affected by ambient temperature, carbon dioxide levels, oxygen levels, and humidity.

[0004] There is an urgent need for a refrigerator that can regulate the gas environment and stably control temperature and humidity parameters for food preservation. Summary of the Invention

[0005] This invention addresses the problem of poor preservation effects in existing equipment. It proposes a modified atmosphere storage cabinet, incorporating a gas control component combined with a PLC controller to regulate the internal gas environment. A temperature detection component, a humidity control component, and a disinfection component, also integrated with the PLC controller, allow for adjustable humidity and temperature. The disinfection component effectively kills bacteria, mold, and other microorganisms within the cabinet, reducing microbial contamination of meat and extending its shelf life.

[0006] To achieve the above objectives, this utility model proposes a modified atmosphere storage cabinet, including a cabinet body, an integrated control box and a refrigeration unit, as well as a gas regulation component, a temperature detection component, a humidity regulation component and a disinfection component; The integrated control box is fixed to the outer wall of the cabinet. Inside the integrated control box, there is a PLC controller, an analog input module and multiple relays. The analog input module is connected to the PLC controller via a ribbon cable, and the coils of the multiple relays are electrically connected to the output terminal of the PLC controller via terminals. The gas control component includes an oxygen sensor, a carbon dioxide sensor, and a gas regulation module. The oxygen sensor and the carbon dioxide sensor are both embedded in the upper part of the side wall of the cabinet. The signal output terminals of the oxygen sensor and the carbon dioxide sensor are connected to the corresponding channels of the analog input module through shielded wires. The gas regulation module is connected to the inside of the cabinet through a gas pipe. The temperature detection component includes a PT100 temperature sensor, which is installed in the lower part of the side wall of the cabinet, and its signal output terminal is connected to the analog input module. The evaporator of the refrigeration unit is embedded inside the top of the cabinet, the compressor of the refrigeration unit is fixed on the outside of the top of the cabinet, and the refrigeration unit is connected to the power supply through the normally open contact of the relay. The humidity control component includes a humidifier, which is installed on the inner side of the bottom of the cabinet. The power supply terminal of the humidifier is connected to the power supply through the normally open contact of a relay. The disinfection component includes a UV lamp and a mounting bracket. The mounting bracket is fixed to the top of the cabinet interior, and the UV lamp is fixed to the mounting bracket with bolts. The UV lamp is connected to the power supply through the normally open contact of a relay.

[0007] Furthermore, the integrated control box includes a box body and a box cover. The box body is provided with layered partitions. The PLC controller and analog input module are fixed to the upper partition, and the relay is fixed to the lower partition. The side wall of the box body is provided with wiring holes corresponding to the wiring positions of each module, and rubber sealing rings are provided in the wiring holes.

[0008] The upper layer is fixed with PLC and analog input modules, and the lower layer is fixed with relays, realizing the separation of strong and weak currents, avoiding electromagnetic interference, and improving the accuracy of signal acquisition and control; the rubber sealing ring effectively blocks external dust and moisture from entering the control box, protecting the internal electronic components from environmental corrosion and extending the service life of the equipment; the partitioned design and standardized wiring holes facilitate wiring and module disassembly and assembly, reducing the difficulty of assembly and maintenance.

[0009] Furthermore, a dust cover is provided at the installation position of the oxygen sensor and the carbon dioxide sensor. The dust cover has a hollow mesh structure and is detachably connected to the side wall of the cabinet by a buckle.

[0010] The dust cover prevents moisture and other impurities inside the cabinet from adhering to the sensor surface, avoiding impact on detection accuracy and ensuring reliable gas concentration data. The snap-on connection design allows for quick disassembly, cleaning, or replacement of the dust cover, reducing daily maintenance costs.

[0011] Furthermore, the detection end of the PT100 temperature sensor is fitted with a metal protective sleeve, which is welded and fixed to the side wall of the cabinet, and the end of the sleeve extends to the central area inside the cabinet.

[0012] Metal sleeves protect sensors from impacts with meat, moisture, or mechanical damage, extending their lifespan.

[0013] Furthermore, it also includes an HMI module, which is embedded in the outer side of the cabinet. The HMI module is connected to the communication interface of the PLC controller via a communication cable. The cabinet has a protective layer made of transparent material corresponding to the position of the HMI module.

[0014] Operators can intuitively view real-time parameters inside the cabinet through the HMI module and quickly set control thresholds, simplifying the operation process.

[0015] Furthermore, the gas regulating module includes an oxygen cylinder and a carbon dioxide cylinder, which are located on the outside of the cabinet. The number of air tubes is two, and the inlets of the two air tubes are respectively sealed and connected to the outlets of the oxygen cylinder and the carbon dioxide cylinder. Each of the two air tubes is equipped with a proportional regulating valve at its outlet, and the two proportional regulating valves are electrically connected to the PLC controller.

[0016] The proportional control valve can continuously adjust its opening degree through the PLC output signal to achieve linear control of gas flow. Two independent gas pipes are connected to oxygen cylinders and carbon dioxide cylinders respectively, and the replenishment of the two gases can be adjusted independently to meet the different gas environment requirements of different meats. Attached Figure Description

[0017] Figure 1 This is one of the structural schematic diagrams of a modified atmosphere storage cabinet according to this utility model; Figure 2 This is the second structural schematic diagram of a modified atmosphere storage cabinet according to this utility model; Figure 3 This is the third schematic diagram of the structure of a modified atmosphere storage cabinet according to this utility model; Figure 4 This is a circuit diagram of a modified atmosphere display cabinet according to the present invention.

[0018] Reference numerals: Cabinet 1, Integrated Control Box 2, PLC Controller 3, Analog Input Module 4, Relay 5, Oxygen Sensor 6, Carbon Dioxide Sensor 7, Gas Tube 8, PT100 Temperature Sensor 9, Humidifier 10, Ultraviolet Lamp 11, Mounting Bracket 12, Dust Cover 13, HMI Module 14, Oxygen Cylinder 15, Carbon Dioxide Cylinder 16, Proportional Control Valve 17. Detailed Implementation

[0019] Example 1 like Figure 1-4 As shown, a modified atmosphere storage cabinet includes a cabinet body 1, an integrated control box 2, and a refrigeration unit, as well as a gas regulation component, a temperature detection component, a humidity regulation component, and a disinfection component. The integrated control box 2 is fixed to the outer wall of the cabinet 1. The integrated control box 2 is equipped with a PLC controller 3, an analog input module 4 and multiple relays 5. The analog input module 4 is connected to the PLC controller 3 through a ribbon cable plug-in, and the coils of the multiple relays 5 are electrically connected to the output terminal of the PLC controller 3 through wiring terminals. The gas control component includes an oxygen sensor 6, a carbon dioxide sensor 7, and a gas regulation module. The oxygen sensor 6 and the carbon dioxide sensor 7 are both embedded in the upper part of the side wall of the cabinet 1. The signal output terminals of the oxygen sensor 6 and the carbon dioxide sensor 7 are connected to the corresponding channels of the analog input module 4 through shielded wires. The gas regulation module is connected to the inside of the cabinet 1 through a gas pipe 8. The temperature detection component includes a PT100 temperature sensor 9, which is installed in the lower part of the side wall of the cabinet 1, and its signal output terminal is connected to the analog input module 4. The evaporator of the refrigeration unit is embedded inside the top of the cabinet 1, the compressor of the refrigeration unit is fixed on the outside of the top of the cabinet 1, and the refrigeration unit is connected to the power supply through the normally open contact of the relay. The humidity control component includes a humidifier 10, which is installed on the inner side of the bottom of the cabinet 1. The power supply terminal of the humidifier 10 is connected to the power supply through the normally open contact of the relay 5. The disinfection assembly includes a UV lamp 11 and a mounting bracket 12. The mounting bracket 12 is fixed to the top of the inside of the cabinet 1. The UV lamp 11 is fixed to the mounting bracket 12 by bolts. The UV lamp 11 is connected to the power supply through the normally open contact of the relay 5.

[0020] The integrated control box 2 includes a box body and a box cover. The box body is provided with layered partitions. The PLC controller 3 and the analog input module 4 are fixed to the upper partition, and the relay 5 is fixed to the lower partition. The side wall of the box body is provided with wiring holes corresponding to the wiring positions of each module, and rubber sealing rings are provided in the wiring holes.

[0021] The oxygen sensor 6 and carbon dioxide sensor 7 are provided with dust covers 13 at their installation positions. The dust covers 13 have a hollow mesh structure and are detachably connected to the side wall of the cabinet 1 by buckles.

[0022] The detection end of the PT100 temperature sensor 9 is fitted with a metal protective sleeve, which is welded and fixed to the side wall of the cabinet 1, and the end of the sleeve extends to the central area inside the cabinet 1.

[0023] It also includes an HMI module 14, which is embedded in the outer side of the cabinet 1. The HMI module 14 is connected to the communication interface of the PLC controller 3 via a communication line. The cabinet 1 is provided with a protective layer made of transparent material at the position corresponding to the HMI module 14.

[0024] HMI module 14 communicates with PLC controller 3 via an RS485 module.

[0025] The gas regulation module includes an oxygen cylinder 15 and a carbon dioxide cylinder 16, which are located on the outside of the cabinet 1. There are two air pipes 8. The inlets of the two air pipes 8 are respectively sealed and connected to the output ports of oxygen cylinder 15 and carbon dioxide cylinder 16. A proportional regulating valve 17 is provided at the outlet of each of the two air pipes 8. The two proportional regulating valves 17 are electrically connected to the PLC controller 3.

[0026] Oxygen sensor 6 collects the oxygen concentration signal inside cabinet 1 in real time. After amplification, the signal is output as an analog signal and transmitted to analog input module 4 via a shielded cable. Analog input module 4 converts the signal into a digital signal (AD value) and then transmits it to PLC controller 3 via a ribbon cable.

[0027] When the oxygen concentration is below the preset lower limit, the PLC controller 3 outputs a control signal to drive the proportional regulating valve 17 corresponding to the oxygen cylinder 15 in the gas regulating module to open the valve and adjust its opening degree, supplementing oxygen into the cabinet 1 through the gas pipe 8. When the oxygen concentration is above the preset upper limit, the PLC controller 3 controls the proportional regulating valve 17 to close, stopping the oxygen supplementation and maintaining the oxygen concentration stable within the target range. (Specifically, the PLC controller 3 has an upper oxygen threshold and an lower oxygen threshold. The PLC controller 3 uses the detection value of the oxygen sensor 6 and adopts PID control to control the proportional regulating valve 17 to gradually open or gradually close the valve.) Carbon dioxide sensor 7 continuously collects the carbon dioxide concentration signal inside cabinet 1 and directly outputs an analog signal, which is transmitted to analog input module 4 via a shielded cable. Analog input module 4 converts the signal into a digital signal and sends it to PLC controller 3. If the actual concentration is lower than the preset lower limit, the PLC controller 3 controls the proportional regulating valve 17 corresponding to the carbon dioxide cylinder 16 in the gas regulating module to open, supplementing carbon dioxide into the cabinet 1 through the gas pipe 8; if the concentration is higher than the preset upper limit, the PLC controller 3 controls the proportional regulating valve 17 to close, stopping the supplementation and ensuring that the carbon dioxide concentration is maintained within the set range. (The control method is the same as that for oxygen control and will not be described again.) The PT100 temperature sensor 9 detects the temperature inside cabinet 1, converts the temperature signal into an analog signal, and transmits it to the analog input module 4. The analog input module 4 converts the signal into a digital signal and transmits it to the PLC controller 3. The PLC controller 3 sets upper and lower temperature thresholds. When the temperature reaches the upper threshold, the coil of the corresponding relay 5 is energized, its normally open contact closes, and the refrigeration unit powers on and operates, lowering the temperature inside cabinet 1 through the evaporator. When the temperature reaches the lower threshold, the refrigeration unit is de-energized, stopping refrigeration and ensuring a stable temperature inside cabinet 1.

[0028] The PLC controller 3 has a built-in timer control program to set the working interval and single working duration of the humidifier 10. The PLC controller 3 outputs a signal to the corresponding relay 5, which energizes the coil of the relay 5, closes its normally open contact, connects the power supply to the power terminal of the humidifier 10, and starts the humidifier 10 to spray humidification into the cabinet 1. When the working time reaches the set working time, the PLC controller 3 stops outputting signals, the relay 5 coil is de-energized, the normally open contact opens, the humidifier 10 is de-energized and stops working, and the humidity inside the cabinet 1 is maintained in a cycle.

[0029] The PLC controller 3 sets the working interval and single working duration of the ultraviolet lamp 11. The PLC controller 3 outputs a control signal to the corresponding relay 5. The coil of the relay 5 is energized, the normally open contact closes, the ultraviolet lamp 11 is powered on, and it starts and emits ultraviolet light at the fixed position of the mounting bracket 12 to disinfect the inside of the cabinet 1. When the working time reaches the set working time, PLC controller 3 stops outputting signals, relay 5 coil is de-energized, normally open contact opens, and ultraviolet lamp 11 is de-energized to stop disinfection.

[0030] HMI module 14 is connected to the communication interface of PLC controller 3 via a communication cable. It receives real-time data on oxygen concentration, carbon dioxide concentration, and temperature inside cabinet 1 from PLC controller 3 and displays it on the screen for easy viewing by operators. Simultaneously, operators can use HMI module 14 to set operating parameters such as upper and lower limits for oxygen concentration, carbon dioxide concentration, and temperature, as well as humidification and UV disinfection durations. These settings are transmitted to PLC controller 3 via the communication cable to update preset program parameters, thereby adjusting the operating mode of the refrigeration unit.

[0031] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A modified atmosphere storage cabinet, comprising a cabinet body (1), an integrated control box (2), and a refrigeration unit, characterized in that, It also includes gas control components, temperature detection components, humidity control components, and disinfection components; The integrated control box (2) is fixed to the outer wall of the cabinet (1). The integrated control box (2) is equipped with a PLC controller (3), an analog input module (4) and multiple relays (5). The analog input module (4) is connected to the PLC controller (3) through a ribbon cable plug-in. The coils of the multiple relays (5) are electrically connected to the output terminal of the PLC controller (3) through wiring terminals. The gas control component includes an oxygen sensor (6), a carbon dioxide sensor (7), and a gas control module. The oxygen sensor (6) and the carbon dioxide sensor (7) are both embedded in the upper part of the side wall of the cabinet (1). The signal output terminals of the oxygen sensor (6) and the carbon dioxide sensor (7) are connected to the corresponding channels of the analog input module (4) through shielded wires. The gas control module is connected to the inside of the cabinet (1) through a gas pipe (8). The temperature detection component includes a PT100 temperature sensor (9), which is installed in the lower part of the side wall of the cabinet (1), and its signal output terminal is connected to the analog input module (4). The evaporator of the refrigeration unit is embedded in the top of the cabinet (1), the compressor of the refrigeration unit is fixed on the outside of the top of the cabinet (1), and the refrigeration unit is connected to the power supply through the normally open contact of the relay. The humidity control component includes a humidifier (10), which is installed on the inner side of the bottom of the cabinet (1). The power supply of the humidifier (10) is connected to the power supply through the normally open contact of the relay (5). The disinfection component includes a UV lamp (11) and a mounting bracket (12). The mounting bracket (12) is fixed to the top of the cabinet (1). The UV lamp (11) is fixed to the mounting bracket (12) by bolts. The UV lamp (11) is connected to the power supply through the normally open contact of the relay (5).

2. A modified atmosphere storage cabinet according to claim 1, characterized in that, The integrated control box (2) includes a box body and a box cover. The box body is provided with layered partitions. The PLC controller (3) and the analog input module (4) are fixed to the upper partition, and the relay (5) is fixed to the lower partition. The side wall of the box body is provided with wire holes corresponding to the wiring positions of each module, and rubber sealing rings are provided in the wire holes.

3. A modified atmosphere storage cabinet according to claim 1, characterized in that, The oxygen sensor (6) and carbon dioxide sensor (7) are provided with dust covers (13) at their installation positions. The dust covers (13) are hollow mesh structures and are detachably connected to the side wall of the cabinet (1) by buckles.

4. A modified atmosphere storage cabinet according to claim 1, characterized in that, The detection end of the PT100 temperature sensor (9) is fitted with a metal protective sleeve, which is welded and fixed to the side wall of the cabinet (1), and the end of the sleeve extends to the central area inside the cabinet (1).

5. A modified atmosphere storage cabinet according to claim 1, characterized in that, It also includes an HMI module (14), which is embedded on the outer side of the cabinet (1). The HMI module (14) is connected to the communication interface of the PLC controller (3) through a communication line. The cabinet (1) is provided with a protective layer made of transparent material at the position corresponding to the HMI module (14).

6. A modified atmosphere storage cabinet according to claim 1, characterized in that, The gas regulation module includes an oxygen cylinder (15) and a carbon dioxide cylinder (16), which are located on the outside of the cabinet (1). There are two air pipes (8). The inlets of the two air pipes (8) are sealed to the outlets of the oxygen cylinder (15) and the carbon dioxide cylinder (16), respectively. A proportional regulating valve (17) is provided at the outlet of each of the two air pipes (8). The two proportional regulating valves (17) are electrically connected to the PLC controller (3).

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