Pulsed magnetic field fresh meat freezing and fresh-keeping equipment

Abstract

The invention relates to the technical field of fresh meat freezing and fresh-keeping, in particular to pulsed magnetic field fresh meat freezing and fresh-keeping equipment which comprises a freezing and fresh-keeping mechanism, the freezing and fresh-keeping mechanism is used for storing and fresh-keeping pork samples, an alternating magnetic field is generated by starting the freezing and fresh-keeping mechanism, eddy current is generated by the alternating magnetic field, and a heat effect is generated by the eddy current effect. The freezing fresh-keeping mechanism is connected with the first adjusting control mechanism and the second adjusting control mechanism, so that food tissue fluid in the fat flows, the fresh meat does not freeze, and the freezing fresh-keeping mechanism is respectively connected with the first adjusting control mechanism and the second adjusting control mechanism; when alternating current is introduced into the solenoid, the solenoid can generate an alternating magnetic field, the alternating magnetic field can generate eddy current, the eddy current effect can generate heat effect, flowing of food tissue fluid in fat is facilitated, the alternating magnetic field can generate eddy current, the eddy current effect can generate heat effect, and flowing of the food tissue fluid in the fat is facilitated. The juice loss is reduced to a certain extent, so that the fresh meat achieves the effect of not freezing.

Description

Technical Field

[0001] The invention relates to the technical field of fresh meat freezing and preservation, in particular to a pulse magnetic field fresh meat freezing and preservation device. Background Art

[0002] As people's living standards improve, users pay more and more attention to the preservation effect of refrigerator storage. For food materials such as fish, shrimp, and meat, the loss of juice during storage can easily lead to a deterioration in taste and darkening of color. In particular, the quality of some high-end food materials will be greatly reduced after being stored for a period of time. In order to improve the quality of preservation, many improvement schemes have appeared in the prior art, such as increasing the freezing speed of food by quick freezing or putting the food into a supercooled state. This scheme requires improving the refrigeration capacity of the refrigerator and will also increase the energy consumption of the refrigerator. Therefore, improving the quality of preservation of frozen storage more efficiently is an urgent challenge faced by technical researchers and developers.

[0003] Studies have shown that since organisms have magnetic effects, the assistance of magnetic fields has a significant impact on the frozen storage process of food. Appropriate magnetic field strength can change the physical and chemical properties of biological macromolecules and cell membranes, effectively remove free radicals, improve the freshness of food, and extend the shelf life. At the same time, the magnetic field can affect the freezing process of water, reduce the size of ice crystals formed during the freezing process of food, effectively reduce the freezing loss of food, and improve the quality of frozen food.

[0004] The Chinese patent "Magnetic Field Fresh-keeping Storage Container and Refrigerator" (application number: 201910872092.5, authorization publication number: CN110479488A, authorization publication date: 2019.11.22) discloses a magnetic field fresh-keeping storage container and refrigerator. Through magnetic field technology, the freezing temperature of food can be effectively reduced (for example, the original freezing temperature of beef is -2°C, but under the action of the magnetic field, this temperature can be reduced to -5°C). Although this can keep the beef fresh at a lower temperature and extend the refrigeration period, it does not achieve the effect of completely preventing the beef from freezing during storage. Therefore, when the beef needs to be used, it still needs to be thawed. Whether microwave or radio frequency thawing is used, this process often consumes a lot of energy.

[0005] The Chinese patent "A fresh-keeping refrigerator with instant cooling function and its control method" (application number: 201810629649.8, authorization publication number: CN108662832A, authorization publication date: 2018.10.16) discloses a fresh-keeping refrigerator with instant cooling function and its control method, which accurately monitors and controls the temperature in the variable temperature zone by controlling the speed of the variable frequency fan, the opening and closing of the damper, and the release of magnetic energy by the magnet, thereby improving the effect and efficiency of the treatment of food that needs instant cooling and fresh-keeping treatment, and reducing energy consumption. However, the instant cooling method will cause the moisture on the surface of the meat to quickly generate ice crystals, which can easily pierce the cell membrane of the meat, causing serious loss of nutrients and moisture, affecting the effect of fresh-keeping.

[0006] The Chinese patent "A Fresh-keeping Refrigerator" (application number: 202221926158.8, authorization publication number: CN218348978U, authorization publication date: 2023.01.20) discloses a fresh-keeping refrigerator, which controls the magnetic field strength of each compartment. It uses the magnetic field released by the magnet to activate the moisture in the food and inhibit the activity of enzymes in the food and bacteria, thereby achieving a good preservation effect. However, the refrigerator uses parameters such as humidity and temperature to control the respiration rate of food to increase the shelf life of food. This freezing and preservation method cannot solve the problem of large size of frozen ice crystals in meat and keep the meat fresh and tender.

[0007] Therefore, how to create a freezing and preservation technology that does not freeze fresh meat and has low energy consumption is an urgent problem to be solved. Based on this, the present invention proposes a pulsed magnetic field fresh meat freezing and preservation equipment to solve the above problems. The technology also has the advantages of energy saving and environmental protection, simple operation and high reliability. Summary of the invention

[0008] The purpose of the present invention is to provide a pulse magnetic field fresh meat freezing and preservation device to solve the problems raised in the above background technology.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A pulse magnetic field fresh meat freezing and preservation device comprises a freezing and preservation mechanism, wherein the freezing and preservation mechanism is used to store and preserve pork samples, and an alternating magnetic field is generated by starting the freezing and preservation mechanism, and the alternating magnetic field generates eddy currents, and a thermal effect is generated by the eddy current effect, so that the food tissue fluid in the fat flows, so that the fresh meat does not freeze, and the freezing and preservation mechanism is respectively connected to a first regulating and controlling mechanism and a second regulating and controlling mechanism;

[0011] The first regulating control mechanism and the second regulating control mechanism are connected to each other, and the voltage input of the equipment in the refrigerator is regulated by the first regulating control mechanism to ensure that the equipment operates under a stable voltage, and the power information is displayed by the first regulating control mechanism to monitor the power consumption of the equipment and perform energy efficiency management;

[0012] The second regulating and controlling mechanism generates a pulse signal, changes the duty cycle of the pulse modulation signal, reduces the average power of the signal, and reduces the heat generated by the device. The second regulating and controlling mechanism also controls the switch and operation status of various devices in the refrigerator.

[0013] The first adjustment control mechanism and the second adjustment control mechanism are both movably connected to a power socket at one end away from the refrigerator.

[0014] Preferably, the freezing and fresh-keeping mechanism comprises a refrigerator, and a plurality of solenoids are fixedly connected inside the refrigerator, and the plurality of solenoids are arranged at equal intervals on a freezing layer inside the refrigerator.

[0015] Preferably, the number of the solenoids is , and the spacing between the solenoids is cm. The uniform distribution of the solenoids makes the magnetic field distribution in the entire area more uniform, and the mutual superposition of the magnetic fields generated by the solenoids reduces the difference in magnetic field strength in the entire area.

[0016] Preferably, the first regulating and controlling mechanism comprises a power meter and a voltage regulator, the power meter and the voltage regulator are connected to each other, the voltage regulator is connected in parallel with a plurality of solenoids, and one end of the power meter away from the voltage regulator is movably connected to a power socket.

[0017] Preferably, the second regulating control mechanism includes a pulse modulation generator and a relay switch, the pulse modulation generator and the relay switch are interconnected, the relay switch is connected to the solenoid at one end away from the pulse modulation generator, the pulse modulation generator is movably connected to the power socket at one end away from the relay switch, and the voltage regulator and the relay switch are interconnected.

[0018] Compared with the prior art, the beneficial effects of the present invention are: Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. Compared with the prior art, a solenoid is added to the present device. When alternating current is passed through the solenoid, it will generate an alternating magnetic field. The alternating magnetic field can generate eddy currents, and the eddy current effect can generate a thermal effect, which is helpful for the flow of food tissue fluid in fat and reduces juice loss to a certain extent. A solenoid is added to the present device. When alternating current is passed through the solenoid, it will generate an alternating magnetic field. The alternating magnetic field can generate eddy currents, and the eddy current effect can generate a thermal effect, which is helpful for the flow of food tissue fluid in fat and reduces juice loss to a certain extent, so that the fresh meat will not freeze.

[0020] 2. Compared with the existing technology, this refrigerator has the advantages of energy saving, environmental protection, and easy operation. By using pulse modulation technology, the duty cycle of the pulse modulation signal is changed to reduce the average power of the signal, thereby reducing the heat generated by the equipment and achieving energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0022] Figure 2 Schematic diagram of the solenoid circuit of the device of the present invention.

[0023] In the figure: 1. Refrigerator; 2. Power socket; 3. Power meter; 4. Pulse modulation generator; 5. Voltage regulator; 6. Relay switch; 7. Solenoid; 8. Pork sample. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-2 , the present invention provides a technical solution:

[0026] Embodiment 1:

[0027] A pulse magnetic field fresh meat freezing and preservation device comprises a freezing and preservation mechanism, which is used to store and preserve pork samples 8. An alternating magnetic field is generated by starting the freezing and preservation mechanism, and the alternating magnetic field generates eddy currents. The eddy current effect generates a thermal effect, which makes the food tissue fluid in the fat flow, reduces the loss of juice to a certain extent, and makes the fresh meat not freeze. By placing the pork sample 8 in a freezing layer, the freezing condition of the pork sample 8 is regularly observed and recorded, and the texture change and flavor retention of the pork sample 8 in different time periods are recorded.

[0028] The freezing and fresh-keeping mechanism is respectively connected to the first regulating and controlling mechanism and the second regulating and controlling mechanism, and the first regulating and controlling mechanism and the second regulating and controlling mechanism are connected to each other. The voltage input of the equipment in the refrigerator 1 is adjusted by the first regulating and controlling mechanism to ensure that the equipment operates under a stable voltage. The power information is displayed by the first regulating and controlling mechanism to monitor the power consumption of the equipment and perform energy efficiency management.

[0029] A pulse signal is generated by the second regulating and controlling mechanism, the duty cycle of the pulse modulation signal is changed, the average power of the signal is reduced, and the heat generated by the equipment is reduced. The second regulating and controlling mechanism also controls the switching and operating status of various equipment in the refrigerator 1. The first regulating and controlling mechanism and the second regulating and controlling mechanism are both movably connected to the power socket 2 at one end away from the refrigerator 1.

[0030] Embodiment 2:

[0031] On the basis of Example 1, in order to prevent the pork sample 8 from freezing, the freezing and fresh-keeping mechanism includes a refrigerator 1, in which a plurality of solenoids 7 are fixedly connected. The solenoids 7 are magnetic field generating elements.

[0032] The changing magnetic field is generated by the on-off of the current, and the magnetic field strength can be adjusted by the current size. The solenoid 7 is 70 cm long and 24 mm in diameter, and is wound with 1200 turns of coil on the outside; the diameter of the coil is 0.4 mm, and the inductance is 687 μH; the alternating magnetic field can generate eddy currents, and the eddy current effect can generate a thermal effect, which is conducive to the flow of tissue fluid of fat foods, thereby reducing juice loss to a certain extent, so that fresh meat can achieve the effect of not freezing. A number of solenoids 7 are arranged at equal intervals in the freezing layer of the refrigerator 1.

[0033] The number of the solenoids 7 is 4, and the spacing between the 4 solenoids 7 is 20 cm. The uniform distribution of the 4 solenoids 7 makes the magnetic field distribution in the entire area more uniform. The mutual superposition of the magnetic fields generated by the solenoids 7 reduces the difference in magnetic field intensity in the entire area, thereby achieving the purpose of enhancing the uniformity of the magnetic field.

[0034] When alternating current is passed through the solenoid 7, an alternating magnetic field is generated, which can generate eddy currents. The eddy current effect can generate a thermal effect, which helps the flow of food tissue fluid in fat, reduces juice loss to a certain extent, and makes fresh meat non-freezing. In addition, the magnetic fields of the four solenoids 7 have the same direction and are evenly distributed. Their magnetic fields are superimposed on each other, so that the magnetic field intensity of the entire area is increased, which helps to keep fat foods fresh. The first regulating and controlling mechanism includes a power meter 3 and a voltage regulator 5. The power meter 3 and the voltage regulator 5 are connected to each other. The voltage regulator 5 is connected in parallel with several solenoids 7. The end of the power meter 3 away from the voltage regulator 5 is movably connected to the power socket 2. The voltage regulator 5 is used to adjust the voltage input of the equipment in the refrigerator 1 to ensure that the equipment operates under a stable voltage. The working range of the voltage regulator 5 is 20V-220V. The power meter 3 is used to display real-time power, accumulated power and other information to monitor the power consumption of the equipment and perform energy efficiency management.

[0035] The second regulating and controlling mechanism comprises a pulse modulation generator 4 and a relay switch 6. The pulse modulation generator 4 and the relay switch 6 are interconnected. The end of the relay switch 6 away from the pulse modulation generator 4 is connected to the solenoid 7. The end of the pulse modulation generator 4 away from the relay switch 6 is movably connected to the power socket 2. The voltage regulator 5 and the relay switch 6 are interconnected. The relay switch 6 is used to control the switching and operating status of various devices in the refrigerator 1, including the refrigeration system and the pulse magnetic field generating system. The working range of the relay switch 6 is a DC pulse of 3V to 22V, the working frequency is 1Hz, and the period is 1s. The pulse modulation generator 4 is used to generate a pulse signal. By using the pulse modulation technology, the duty cycle of the pulse modulation signal is changed, thereby reducing the average power of the signal, thereby reducing the heat generated by the equipment, and achieving the effect of energy saving. The duty cycle modulation range of the pulse modulation generator 4 is 10%-20%.

[0036] Working principle, such as Figure 2 As shown, four solenoids 7 are evenly distributed in the freezing layer, and each solenoid 7 is spaced 20 cm apart to ensure uniformity of magnetic field distribution. Each solenoid 7 is 70 cm long and 24 mm in diameter, and is wound with 1200 turns of coils on the outside, wherein the diameter of the coil is 0.4 mm and the inductance is 687 μH. One end of the solenoid 7 is connected to the relay switch 6, and the other end is connected to the voltage regulator 5. The operating frequency of the relay switch 6 is 1 Hz, and the period is 1 s. The relay switch 6 is connected to the pulse modulation generator 4, and the pulse modulation generator 4 uses a 50 Hz pulse signal. , the duty cycle is adjusted to 20%, there are 10 cycles in each pulse, that is, 10 sine waves, the operating voltage is 20V, the peak power is 200W, the power applied to each winding is 50W, the average power is 10W, the operating voltage of the voltage regulator 5 is adjusted to 220V, the power meter 3 is connected to the voltage regulator 5, and the real-time power is displayed. Under the above-mentioned set conditions, the pork sample 8 is placed in the freezing layer of the refrigerator 1, and the freezing condition of the pork sample 8 is regularly observed and recorded, and the texture changes and flavor retention of the pork sample 8 in different time periods are recorded.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pulse magnetic field fresh meat freezing and preservation device, characterized by: The invention comprises a freezing preservation mechanism, which is used to store and preserve pork samples. The freezing preservation mechanism is started to generate an alternating magnetic field, which generates eddy currents. The eddy current effect generates a thermal effect, so that the food tissue fluid in the fat flows, so that the fresh meat does not freeze. The freezing preservation mechanism adjusts the voltage input of the device therein through the first regulating and controlling mechanism and the second regulating and controlling mechanism to ensure that the device operates under a stable voltage. The power information is displayed through the first regulating and controlling mechanism to monitor the power consumption of the device and perform energy efficiency management. A pulse signal is generated by the second regulating and controlling mechanism to change the duty cycle of the pulse modulation signal, thereby reducing the average power of the signal and the heat generated by the equipment. The second regulating and controlling mechanism also controls the switching and operating status of various equipment in the freezing and preservation mechanism. Both the first regulating and controlling mechanism and the second regulating and controlling mechanism realize switching by plugging and unplugging the power socket.

2. The pulse magnetic field fresh meat freezing and preservation device according to claim 1, characterized in that: The freezing and fresh-keeping mechanism comprises a refrigerator, in which a plurality of solenoids are fixedly connected, and the plurality of solenoids are arranged at equal intervals on a freezing layer in the refrigerator.

3. The pulse magnetic field fresh meat freezing and preservation device according to claim 2 is characterized in that: The number of the solenoids is 4, and the spacing between the 4 solenoids is 20 cm. The uniform distribution of the 4 solenoids makes the magnetic field distribution in the entire area more uniform, and the mutual superposition of the magnetic fields generated by the solenoids reduces the difference in magnetic field intensity in the entire area.

4. The pulse magnetic field fresh meat freezing and preservation device according to claim 2, characterized in that: The first regulating control mechanism comprises a power meter and a voltage regulator, the power meter and the voltage regulator are connected to each other, the voltage regulator is connected in parallel with a plurality of solenoids, and one end of the power meter away from the voltage regulator is movably connected to a power socket.

5. The pulse magnetic field fresh meat freezing and preservation device according to claim 4, characterized in that: The second regulation and control mechanism includes a pulse modulation generator and a relay switch, the pulse modulation generator and the relay switch are connected to each other, the relay switch is connected to the solenoid at one end away from the pulse modulation generator, the pulse modulation generator is movably connected to the power socket at one end away from the relay switch, and the voltage regulator and the relay switch are connected to each other.

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