Tunnel type Helmholtz coil magnetic field array coupling liquid nitrogen pre-freezing equipment

Abstract

The utility model is applicable to the technical field of freezing equipment, and provides tunnel type Helmholtz coil magnetic field array coupling liquid nitrogen pre-freezing equipment which comprises a freezing tunnel, a magnetic field device and a liquid nitrogen spraying device are arranged in the freezing tunnel, and the magnetic field device comprises a frequency converter and a Helmholtz coil. The plurality of Helmholtz coils are uniformly distributed in the freezing tunnel; the magnetic field device further comprises a power supply electrically connected with the frequency converter; magnetic fields generated by the magnetic field device are evenly distributed in the conveying space of the whole freezing tunnel, and magnetic fields with different intensities are generated by the Helmholtz coil based on the frequency converter connected with the power source. Materials slowly enter the freezing tunnel through the conveying belt, the liquid nitrogen spraying device and the magnetic field device act on the materials together, liquid nitrogen and a magnetic field are evenly distributed in the space of the freezing tunnel, and the materials pass through the magnetic fields of the pre-cooling area, the phase change area and the supercooling area in sequence in the conveying process, so that rapid freezing is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration equipment technology, and particularly relates to a tunnel-type Holmhetz coil magnetic field array coupled liquid nitrogen pre-freezing equipment. Background Technology

[0002] Freezing generally extends the shelf life of meat products by inhibiting microbial growth and reducing enzyme activity.

[0003] As people's living standards improve, they have higher requirements for the quality of frozen products, leading to the emergence of new freezing technologies, including magnetic field-assisted freezing, electrostatic field-assisted freezing, and ultrasonic field-assisted freezing. Magnetic field-assisted freezing accelerates the freezing rate and reduces the volume of ice crystals formed during freezing by influencing water molecule crystallization, thereby reducing mechanical damage caused by freezing and achieving the goal of improving freezing quality and increasing storage life. Furthermore, the application of the magnetic field makes the entire system more stable, increases the viscosity of water, reduces water diffusion, and thus slows down ice recrystallization.

[0004] Currently, there are challenges in optimizing parameters for magnetic field-assisted freezing. Different materials and different freezing stages require different optimal magnetic field parameters, and some equipment suffers from uneven magnetic field distribution and insufficient stability. Utility Model Content

[0005] The purpose of this utility model embodiment is to provide a tunnel-type Holmhetz coil magnetic field array coupled liquid nitrogen pre-freezing device, which aims to solve the problem of parameter optimization in current magnetic field-assisted freezing. Different materials require different optimal magnetic field parameters at different freezing stages, and some devices have problems such as uneven magnetic field distribution and insufficient stability.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] One embodiment of this utility model provides a tunnel-type Holmhetz coil magnetic field array coupled with liquid nitrogen pre-freezing equipment, including:

[0008] The freezing tunnel is equipped with a magnetic field device and a liquid nitrogen spraying device. The magnetic field device includes a frequency converter and a Holmhez coil. Several Holmhez coils are evenly distributed inside the freezing tunnel. The magnetic field device also includes a power supply that is electrically connected to the frequency converter. The magnetic field generated by the magnetic field device is evenly distributed throughout the transmission space of the freezing tunnel. The frequency converter connected to the power supply enables the Holmhez coils to generate magnetic fields of different intensities.

[0009] A conveyor belt runs through the freezing tunnel, used to feed materials to be frozen into the freezing tunnel.

[0010] Furthermore, the conveyor belt includes a conveyor roller and a belt body wound around the conveyor roller. The rotation of one of the conveyor rollers is driven by a motor. The motor drives the conveyor roller to rotate so that the material to be frozen placed on the belt body is sent into the freezing tunnel.

[0011] Furthermore, the conveyor belt is made of non-magnetic rubber.

[0012] Furthermore, the liquid nitrogen spraying device includes a spraying rod with multiple nozzles evenly distributed on it, the nozzles being used to spray liquid nitrogen from the spraying rod.

[0013] Furthermore, the spray bar is connected to one end of the delivery hose, the other end of the delivery hose is connected to the liquid nitrogen delivery pipe, and the liquid nitrogen delivery pipe is connected to the liquid nitrogen tank.

[0014] Compared with existing technologies, the advantages of this utility model of tunnel-type Holmhetz coil magnetic field array coupled liquid nitrogen pre-freezing equipment are:

[0015] First, a power supply is connected to several frequency converters installed in the freezing tunnel, so that the magnetic field is evenly distributed in the freezing tunnel. Under the influence of the magnetic field, the crystallization of water molecules is affected, the freezing rate is accelerated, and the volume of the ice crystals formed by freezing is reduced.

[0016] Secondly, the frequency converter of this utility model adopts a variable frequency and variable intensity magnetic field control mode. Through segmented control, it can effectively control the magnetic field output intensity at different stages, improve the freezing rate, realize the control of magnetic field intensity in different regions and stages, shorten the cooling time and phase change time, improve freezing efficiency, reduce juice loss rate, and improve product quality.

[0017] In summary, the material of this invention slowly enters the freezing tunnel via a conveyor belt. The liquid nitrogen spraying device and the magnetic field device work together on the material. The liquid nitrogen and magnetic field are evenly distributed in the space of the freezing tunnel. During the conveying process, the material passes through the magnetic fields of the pre-cooling zone, the phase change zone, and the supercooling zone in sequence, thereby achieving rapid freezing. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model.

[0019] Figure 1 A three-dimensional structural diagram of a tunnel-type Holmhetz coil magnetic field array coupled with liquid nitrogen pre-freezing equipment provided in an embodiment of this utility model.

[0020] In the attached diagram: 1. Power supply; 2. Freezing tunnel; 3. Conveyor belt; 4. Holmhez coil; 5. Spray bar; 6. Nozzle; 7. Delivery hose; 8. Liquid nitrogen delivery pipe; 9. Frequency converter; 10. Liquid nitrogen tank. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0023] like Figure 1 The diagram shown is a structural diagram of a tunnel-type Holmhetz coil magnetic field array coupled liquid nitrogen pre-freezing device provided in an embodiment of the present invention. The pre-freezing device provided by the present invention includes a freezing tunnel 2 and a conveyor belt 3 passing through the freezing tunnel 2. The conveyor belt 3 is used to feed the material to be frozen into the freezing tunnel 2.

[0024] Optionally, in one implementation, the conveyor belt 3 includes a conveyor roller and a belt body wound around the conveyor roller. The rotation of one of the conveyor rollers is driven by a motor, and the motor drives the conveyor roller to rotate so that the material to be frozen placed on the belt body is sent into the freezing tunnel 2.

[0025] Preferably, the conveyor belt 3 should be made of non-magnetic material or have non-magnetic material attached to it.

[0026] Furthermore, in this embodiment of the invention, a magnetic field device and a liquid nitrogen spraying device are provided inside the freezing tunnel 2.

[0027] Specifically, in one implementation, the magnetic field device includes a frequency converter 9 and a Holmhetz coil 4, with several Holmhetz coils 4 evenly distributed inside the freezing tunnel 2;

[0028] The magnetic field device provided in this embodiment of the present invention also includes a power supply 1 electrically connected to the frequency converter 9. The power supply 1 is connected to several frequency converters 9 installed in the freezing tunnel 2 by wires, so that the magnetic field is evenly distributed in the freezing tunnel 2. Under the influence of the magnetic field, the crystallization of water molecules is affected, the freezing rate is accelerated, and the volume of the ice crystals formed by freezing is reduced.

[0029] The present invention uses a magnetic field device to generate a magnetic field that is evenly distributed throughout the transmission space of the entire freezing tunnel 2. The power supply 1 is connected to the frequency converter 9, and the corresponding Holmhez coils 4 generate magnetic fields of different intensities.

[0030] Furthermore, this invention employs variable frequency and intensity to control the magnetic field strength in different regions and stages, thereby shortening the cooling time and phase change time, improving freezing efficiency, reducing juice loss rate, and enhancing product quality.

[0031] This invention uses a Holmhetz coil 4 to generate a magnetic field, which improves the uniformity of freezing and results in good quality of the thawed material.

[0032] This invention employs a variable frequency and variable intensity magnetic field control mode. Through segmented control, the magnetic field output intensity at different stages can be effectively controlled, thereby improving the freezing rate.

[0033] Furthermore, in this embodiment of the invention, a liquid nitrogen spraying device is also provided inside the freezing tunnel 2, which is used for spraying liquid nitrogen.

[0034] In one implementation, the material used inside the space of the freezing tunnel 2 should be a non-magnetic material or be covered with a non-magnetic material. The material slowly enters the freezing tunnel 2 via the conveyor belt 3. The liquid nitrogen spray device and the magnetic field device work together on the material. The liquid nitrogen and the magnetic field are evenly distributed in the space of the freezing tunnel 2. During the conveying process, the material passes through the magnetic fields of the pre-cooling zone, the phase change zone, and the supercooling zone in sequence to achieve rapid freezing.

[0035] The liquid nitrogen of this invention has extremely low temperature and high thermal conductivity, which maintains a low-temperature environment;

[0036] The freezing efficiency is determined by the running speed of the conveyor belt 3 and the liquid nitrogen spraying density of the liquid nitrogen spraying device. Those skilled in the art can reasonably set the running speed of the conveyor belt 3 and the spraying density of the liquid nitrogen spraying device as needed.

[0037] As an implementation of the liquid nitrogen spraying device provided in this embodiment, the liquid nitrogen spraying device of this utility model includes a spraying rod 5, on which a plurality of nozzles 6 are evenly distributed. The nozzles 6 are used to spray liquid nitrogen in the spraying rod 5. The spraying rod 5 is connected to one end of a delivery hose 7, and the other end of the delivery hose 7 is connected to a liquid nitrogen delivery pipe 8. The liquid nitrogen delivery pipe 8 is connected to a liquid nitrogen tank 10. The liquid nitrogen tank 10 is used to supply liquid nitrogen to the nozzles 6 for further liquid nitrogen spraying using the nozzles 6.

[0038] It is understandable that when the nozzle 6 sprays liquid nitrogen, those skilled in the art can reasonably set up a corresponding power source (such as an electric turbine liquid nitrogen pump) as needed to send the liquid nitrogen in the liquid nitrogen tank 10 to the nozzle 6 for spraying.

[0039] The above solutions are merely illustrative examples of preferred embodiments, but are not limited thereto. When implementing this invention, appropriate substitutions and / or modifications can be made according to the user's needs.

[0040] The number of devices and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of this utility model will be readily apparent to those skilled in the art.

[0041] Although embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. Other modifications can be readily implemented by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and examples shown and described herein.

Claims

1. A tunnel-type Holmhez coil magnetic field array coupled with liquid nitrogen pre-freezing equipment, characterized in that, include: A freezing tunnel (2) is provided with a magnetic field device and a liquid nitrogen spraying device. The magnetic field device includes a frequency converter (9) and a Holmhez coil (4). Several Holmhez coils (4) are evenly distributed inside the freezing tunnel (2). The magnetic field device also includes a power supply (1) that is electrically connected to the frequency converter (9). The magnetic field generated by the magnetic field device is evenly distributed throughout the transmission space of the entire freezing tunnel (2). Based on the frequency converter (9) connected to the power supply (1), the Holmhez coils (4) generate magnetic fields of different intensities. A conveyor belt (3) runs through the freezing tunnel (2) and is used to feed materials to be frozen into the freezing tunnel (2).

2. The tunnel-type Holmhetz coil magnetic field array coupled liquid nitrogen pre-freezing device according to claim 1, characterized in that, The conveyor belt (3) includes a conveyor roller and a belt body wound around the conveyor roller, wherein the rotation of one of the conveyor rollers is driven by a motor.

3. The tunnel-type Holmhetz coil magnetic field array coupled liquid nitrogen pre-freezing device according to claim 2, characterized in that, The conveyor belt (3) is made of non-magnetic rubber.

4. The tunnel-type Holmhetz coil magnetic field array coupled liquid nitrogen pre-freezing device according to claim 3, characterized in that, The liquid nitrogen spraying device includes a spray rod (5), on which multiple nozzles (6) are evenly distributed.

5. The tunnel-type Holmhetz coil magnetic field array coupled liquid nitrogen pre-freezing device according to claim 4, characterized in that, The spray bar (5) is connected to one end of the delivery hose (7), the other end of the delivery hose (7) is connected to the liquid nitrogen delivery pipe (8), and the liquid nitrogen delivery pipe (8) is connected to the liquid nitrogen tank (10).

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