Refrigeration equipment capable of sterilizing and preserving freshness
By integrating corona sterilization module and magnetic field preservation module in refrigeration equipment, and using high-voltage pulse power supply and magnetic field technology, the problem that existing refrigeration equipment cannot have both sterilization and preservation is solved, achieving safe, simple, low-temperature, fast sterilization and efficient preservation effects.
Patent Information
- Application Number
- CN202411951190.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-04-08
AI Technical Summary
Existing refrigeration equipment cannot have both safe, simple, low-temperature, fast sterilization and efficient preservation functions, and traditional sterilization methods have problems of chemical residues and environmental pollution.
A refrigeration equipment including corona sterilization module and magnetic field preservation module was designed, and sterilization and preservation was used to sterilize and preserve freshly using high-voltage pulse power supply and magnetic field technology, and automated control was achieved through ammonia sensors and control systems.
It achieves fast, safe, residual toxicity-free sterilization and efficient preservation of food, avoids the use of chemical substances and environmental pollution, and maintains the natural state and nutritional value of food.
Smart Images
Figure CN119769551A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field, and in particular to a refrigeration device capable of sterilizing and preserving freshness. Background Art
[0002] Food sterilization is to prevent food corruption, deterioration and bacterial infection by killing or inhibiting the growth of microorganisms, thus ensuring the safety of food. Food preservation is to prevent food corruption through a series of measures and technologies, while extending the shelf life of food, and maintaining the taste, color and nutritional content of food. Food sterilization and preservation are closely related, and play an important role in ensuring food safety and extending the shelf life.
[0003] With the improvement of people's requirements for food quality and the spread of various viruses in the environment, new requirements have been put forward for sterilization technology. The traditional sterilization method is mainly chemical sterilization. Chemical sterilization can sterilize a large number of products more thoroughly, but the process is complicated and there are chemical residues, which pose a threat to human health.
[0004] If fruits and vegetables are not properly preserved during the process of picking, transportation, circulation and storage, their nutritional value will be reduced, the taste will deteriorate, and in severe cases, they will spoil. Common methods of fruit and vegetable preservation include physical preservation, chemical preservation and biological preservation. However, the safety of chemical preservation cannot be guaranteed, and the price of biological preservation is relatively expensive.
[0005] Food sterilization and food preservation are two concepts that are both related and different. In daily life, people often use refrigeration equipment such as refrigerators and freezers to store food. However, such refrigeration equipment often has simple functions and only has a low-temperature preservation function, with poor preservation effect, and cannot have both sterilization and excellent preservation effects. The existing technology urgently needs refrigeration equipment that has a sterilization function that is safe, simple, low-temperature, fast and has no residual toxicity, and a high-efficiency preservation function that is simple to operate, non-toxic and harmless, and does not damage the nutritional content, flavor and color of food. Summary of the invention
[0006] In view of this, the present invention proposes a refrigeration device capable of sterilizing and preserving food to solve the above technical problems.
[0007] The embodiment of the present invention provides a refrigeration device capable of sterilization and preservation, comprising a corona sterilization module, a magnetic field preservation module, an ammonia sensor and a control system; the corona sterilization module comprises a bridge rectifier circuit, a high-voltage pulse power supply and a corona discharge electrode; the magnetic field preservation module comprises a DC power supply, a signal generating circuit, a full-bridge inverter circuit and an electromagnetic coil; the ammonia sensor is used to monitor the ammonia content in the refrigeration device; the control system is used to control the working state of the corona sterilization module according to the ammonia content, and is used to control the working state of the magnetic field preservation module.
[0008] Preferably, the corona sterilization module is connected to the power grid, and after being rectified by a bridge rectifier circuit, it is fed into a high-voltage pulse power supply, and the high-voltage pulse power supply can generate an electric field with a peak value of 22 kV / cm under the control of the control system.
[0009] Preferably, the corona discharge electrode is a needle-plate corona discharge electrode.
[0010] Preferably, the needle-plate corona discharge electrode comprises a needle electrode array consisting of a plurality of needle electrodes and a plate electrode opposite to the needle electrode array, the power connection end of the needle electrode is connected to the high-voltage pulse power supply, and the discharge end of the needle electrode is arranged opposite to the plate electrode.
[0011] Preferably, the ammonia sensor is configured to be in working state at all times.
[0012] Preferably, the control system is configured such that when the ammonia sensor detects the presence of ammonia in the refrigeration equipment, the control system outputs a trigger pulse signal to control the operation of the high-voltage pulse power supply; when the ammonia sensor does not detect ammonia gas, the control system does not output a trigger pulse signal and the high-voltage pulse power supply stops working.
[0013] Preferably, the control system is a single chip microcomputer control system.
[0014] Preferably, the magnetic field preservation module is configured to be in working state at all times.
[0015] Preferably, the magnetic field preservation module further includes a DC blocking capacitor disposed between the full-bridge inverter circuit and the electromagnetic coil for isolating a DC signal. The beneficial effects of the embodiment of the present invention include at least:
[0016] The refrigeration equipment in the embodiment of the present invention has both sterilization and preservation functions, adopts physical sterilization and preservation technology, has good sterilization effect, is safe, simple and fast, is easy to operate, is non-toxic and harmless, and achieves efficient preservation. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 Schematic diagram of the system structure of an embodiment of the present invention.
[0018] Figure 2 The figure is a schematic diagram of a high-voltage pulse power supply circuit according to an embodiment of the present invention.
[0019] Figure 3 Schematic diagram of the needle-plate corona discharge electrode structure according to an embodiment of the present invention.
[0020] Figure 4 The single-phase full-bridge inverter circuit schematic diagram of an embodiment of the present invention.
[0021] Figure 5It is a flow chart of the operation of the single chip microcomputer control system in an embodiment of the present invention.
[0022] Figure 6 It is a schematic diagram of the STM32 single-chip microcomputer core board in an embodiment of the present invention. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. However, those skilled in the art will appreciate that the present invention is not limited to the accompanying drawings and the following embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments may be combined with each other without conflict.
[0024] Reference Figure 1-6 , the embodiment of the present invention provides a refrigeration device capable of sterilization and preservation, including a corona sterilization module, a magnetic field preservation module, an ammonia sensor and a control system;
[0025] The corona sterilization module comprises a bridge rectifier circuit, a high-voltage pulse power supply and a needle-plate corona discharge electrode.
[0026] The magnetic field preservation module comprises a step-down transformer, a bridge rectifier circuit, a signal generating circuit, a full-bridge inverter circuit, a DC blocking capacitor, and an electromagnetic coil.
[0027] The ammonia sensor is used to monitor the ammonia content in the refrigeration equipment.
[0028] The control system is used to control the working state of the corona sterilization module according to the ammonia content, and is used to control the working state of the magnetic field preservation module.
[0029] The working principle of the embodiment of the present invention is that when foods such as fruits, vegetables and meat are placed in a refrigeration device, since fruits, vegetables and meat will produce harmful gases such as ammonia during the decay process, the ammonia sensor is always in a working state. Once it is detected that there is ammonia gas inside the refrigerator, the control system can control the corona sterilization module to start sterilization; at the same time, the control system also controls the working state of the magnetic field preservation module.
[0030] The corona sterilization module includes a bridge rectifier circuit, a high-voltage pulse power supply and a corona discharge electrode. The corona sterilization module is connected to the power grid, and after being rectified by the bridge rectifier circuit, the high-voltage pulse power supply is fed. The high-voltage pulse power supply can generate a high electric field with a peak value of 22kv / cm under the control of the control system, so that the molecules in the air are under the action of the electric field. When the electric field intensity reaches a certain value, the molecules in the air will be ionized to form charged ions and free radicals. These charged ions can destroy the cell membrane structure of microorganisms and interfere with the metabolic pathways of microorganisms, causing the microorganisms to lose the ability to grow and reproduce, and the microorganisms lose their activity in a short time. At the same time, under the action of the strong electric field, ammonia will undergo an oxidation reaction to generate harmless substances such as water and nitrogen.
[0031] Reference Figure 2 The schematic diagram of the high-voltage pulse power supply circuit of the embodiment of the present invention is shown. After the power supply is supplied, the capacitor C1 is charged first. After the capacitor C1 is fully charged, the circuit charges the capacitor C2 through R1. The resistance of the base resistor R1 of the transistor Q1 is large, the current change through the resistor R1 is small, the impedance of the transformer coil is small, the voltage across the transformer winding is close to 0V, and the base voltage of the transistor Q1 is close to 0V at the moment of power-on, and the transistor Q1 is not turned on. As R1 charges the capacitor C2, when the voltage across the capacitor C2 is greater than 0.5V, the base of the transistor Q1 starts to conduct weakly from the cutoff, Q1 will generate an amplified collector current, and the transistor Q2 will generate a base current. The current is amplified through the transistor Q2. After amplification, the emitter current of the transistor Q2 flows through the transformer, and the current is amplified geometrically as the base current of the transistor Q1 increases. When the current in the transformer changes from small to large, the primary winding of the transformer will generate an induced electromotive force with positive top and negative bottom to hinder the current amplification. The induced electromotive force will be released through the capacitor C2 and then through the base of the transistor Q1, so that the base current of the transistor Q1 becomes larger, forming positive feedback. The transistor Q2 quickly saturates and conducts, and the capacitor C2 discharges at the same time, forming a pulse wave. When the current in the transformer no longer changes after the transistor Q2 is saturated and conducted, the induced electromotive force in the transformer will disappear, and the base current passing through the transistor Q1 will decrease. The emitter current of the transistor Q2 will decrease accordingly. When the current in the transformer changes from large to small, the transformer will generate an induced electromotive force with negative upper and positive lower, and charge the capacitor C1 through the resistor R1. When the induced electromotive force is released, and the voltage across the capacitor C2 and the voltage across the transformer to the ground is greater than 0.5V, the transistors Q1 and Q2 will turn on again.
[0032] like Figure 3As shown, the corona discharge electrode of the embodiment of the present invention is preferably a needle-plate corona discharge electrode, which includes a needle electrode array composed of a plurality of needle electrodes 10 and a plate electrode 20 opposite to the needle electrode array, the power connection end of the needle electrode 10 is connected to the high-voltage pulse power supply, the discharge end of the needle electrode 10 is arranged opposite to the plate electrode 20, and the plate electrode 20 is grounded. With the needle-plate corona discharge electrode, the discharge occurs earlier, the corona inception voltage at the start of discharge is lower, the external applied voltage range in stable corona discharge is larger, the food surface can be evenly covered, it is not easy to cause spark discharge and breakdown, the discharge stability is good, and it is particularly suitable for household refrigeration equipment.
[0033] The control system is preferably a single-chip microcomputer control system, such as an STM32 single-chip microcomputer, and its core board schematic diagram is shown in Figure 6 . Reference Figure 5 The operation process of the single-chip microcomputer control system shown is as follows: the system starts, is initialized, and the ammonia sensor works. When the ammonia sensor detects the presence of ammonia in the refrigeration equipment, the monitoring signal is converted into an electrical signal and output to the control system. The control system outputs a trigger pulse signal, which drives the corresponding switch after amplification, starts the corona sterilization module, and the high-voltage pulse power supply works. When the ammonia sensor does not detect ammonia gas, the control system does not output a trigger pulse signal, and the high-voltage pulse power supply stops working.
[0034] See also Figure 1 The magnetic field preservation module includes a step-down transformer, a DC power supply, a signal generating circuit, a full-bridge inverter circuit, a DC blocking capacitor and an electromagnetic coil. Figure 4 , the full-bridge inverter circuit includes four drive modules and four switches. The corona sterilization module is connected to the power grid, and the 220V industrial frequency voltage is stepped down by a step-down transformer, and then rectified by a rectifier circuit to supply power to the signal generating circuit. The signal generating circuit generates two clock signals with opposite phases, which are transmitted to the drive module of the full-bridge inverter circuit. After amplification, the four switches of the full-bridge inverter circuit are driven, and the drive signals of the four switches are in phase, generating positive and negative symmetrical square pulses to excite the electromagnetic coil to generate a magnetic field of the same frequency. The DC blocking capacitor is used to isolate the DC signal. Preferably, the magnetic field preservation module is always in working condition.
[0035] Magnetic field preservation technology uses the magnetic field to magnetize water molecules and certain trace elements in food, changing the arrangement order of water molecules in food cells and changing the distribution of ions in cells. This change can affect the permeability of cell membranes and enzyme activity, thereby reducing the metabolic rate of cells, inhibiting the growth and reproduction of microorganisms, and achieving the purpose of preservation.
[0036] The refrigeration equipment of the embodiment of the present invention has a corona sterilization module and a magnetic field preservation module. The corona sterilization module uses a high-voltage pulse power supply to generate a high-voltage electric field under the control of the control system to form an ionized gas, which makes the microorganisms lose their activity in a short time. Compared with the traditional chemical sterilization method, corona sterilization does not require chemical agents, avoiding the impact of chemical residues on food, and the energy consumption during the corona sterilization process is low, and no environmental pollution problems such as waste gas and wastewater are generated, which has a good energy-saving and environmental protection effect; the magnetic field preservation module can effectively inhibit the reproduction of microorganisms inside the food through the effect of the magnetic field, prolong the shelf life of the food, maintain the freshness and nutritional value of the food, and will not damage the quality of the food. Compared with the traditional preservative preservation method, magnetic field preservation does not require the addition of chemical substances and maintains the natural state of the food.
[0037] The single-chip microcomputer control circuit includes a single-chip microcomputer and peripheral circuits, a pulse amplifying circuit and related programs and algorithm flows. The single-chip microcomputer control circuit belongs to the prior art and need not be described in detail.
[0038] The above is an explanation of the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A refrigeration device capable of sterilizing and preserving, characterized in that: It includes a corona sterilization module, a magnetic field preservation module, an ammonia sensor and a control system; The corona sterilization module includes a bridge rectifier circuit, a high-voltage pulse power supply and a corona discharge electrode; The magnetic field preservation module includes a DC power supply, a signal generating circuit, a full-bridge inverter circuit and an electromagnetic coil; The ammonia sensor is used to monitor the ammonia content in the refrigeration equipment; The control system is used to control the working state of the corona sterilization module according to the ammonia content, and is used to control the working state of the magnetic field preservation module.
2. The refrigeration device according to claim 1, characterized in that The corona sterilization module is connected to the power grid, and after being rectified by the bridge rectifier circuit, it is fed into the high-voltage pulse power supply. The high-voltage pulse power supply can generate an electric field with a peak value of 22kv / cm under the control of the control system.
3. The refrigeration device according to claim 1, characterized in that The corona discharge electrode is a needle-plate type corona discharge electrode.
4. The refrigeration device according to claim 3, characterized in that The needle-plate corona discharge electrode comprises a needle electrode array consisting of a plurality of needle electrodes and a plate electrode opposite to the needle electrode array. The power connection end of the needle electrode is connected to the high-voltage pulse power supply, and the discharge end of the needle electrode is arranged opposite to the plate electrode.
5. The refrigeration device according to claim 1, characterized in that The ammonia sensor is configured to be in working state all the time.
6. The refrigeration device according to claim 5, characterized in that The control system is configured such that when the ammonia sensor detects the presence of ammonia in the refrigeration equipment, the control system outputs a trigger pulse signal to control the operation of the high-voltage pulse power supply; when the ammonia sensor does not detect ammonia gas, the control system does not output a trigger pulse signal and the high-voltage pulse power supply stops working.
7. The refrigeration device according to claim 1, characterized in that The control system is a single chip microcomputer control system.
8. The refrigeration device according to claim 1, characterized in that The magnetic field preservation module is configured to be in working state all the time.
9. The refrigeration device according to claim 1, characterized in that The magnetic field preservation module also includes a DC isolation capacitor arranged between the full-bridge inverter circuit and the electromagnetic coil, which is used to isolate the DC signal.