WO2020118994A1 - Radio frequency thawing device - Google Patents

Abstract

The present application relates to the technical field of radio frequency thawing, and disclosed is a radio frequency thawing device, comprising a thawing cavity, a housing, a radio frequency source, a radio frequency power amplifier, and a radio frequency antenna. The radio frequency source and the radio frequency power amplifier are provided between the thawing cavity and the housing; the radio frequency source and the radio frequency power amplifier are connected and configured to amplify a radio frequency power generated by the radio frequency source to a set power; the radio frequency antenna is provided on the inner wall of the thawing cavity; and the radio frequency antenna and the radio frequency power amplifier are connected and configured to radiate radio frequency radiation generated by the radio frequency source into the thawing cavity. According to the radio frequency thawing device provided by embodiments of the present invention, the temperature of a thawed food rises steadily inside and outside, the uniformity of heating of the thawed food is improved, and the thawing effect is improved.

Description

Radio frequency defrosting device

This application is based on the Chinese patent application with the application number 201811536114.2 and the application date of 2018.12.14, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated by reference.

Technical field

This application relates to the technical field of radio frequency thawing, for example, to a radio frequency thawing device.

Background technique

The thawing methods for food thawing mainly include: natural thawing, soaking and thawing, refrigerated thawing and microwave thawing. Among them, natural thawing and refrigerated thawing are for thawing frozen foods, especially for large pieces of meat. The thawing time is longer, and there is a serious loss of juice, which affects the taste and nutrients of the food. Dipping and thawing is mainly aimed at thawing meat, which can shorten the thawing time relatively, but it also has the problem of juice loss, serious discoloration, and easy to breed bacteria. Microwave defrosting has obvious effect on the heating of frozen food in a short time. Existing microwave ovens used for defrosting mainly use the weight of the defrosted items to determine the defrosting power and defrosting time or artificial when determining the defrosting power and defrosting time. Setting, artificially setting the defrosting power and defrosting time will cause incomplete defrosting or set the defrosting time to be too long, causing the meat to change color after defrosting, which will affect the food taste and nutrients.

Summary of the invention

The present disclosure aims to provide a radio frequency thawing device that improves thawing efficiency. In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary section is not a general comment, nor is it to determine key/important elements or to describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

According to an embodiment of the present disclosure, a radio frequency defrosting device is provided, including: a defrosting cavity, a housing, a radio frequency source, a radio frequency power amplifier, and a radio frequency antenna;

The radio frequency source and the radio frequency power amplifier are disposed between the defrosting cavity and the housing; the radio frequency power amplifier is connected to the radio frequency source and is configured to amplify the radio frequency power generated by the radio frequency source to the device Constant power

The radio frequency antenna is disposed on the inner wall of the defrosting cavity; the radio frequency antenna is connected to the radio frequency power amplifier and configured to radiate radio frequency generated by the radio frequency source into the defrosting cavity.

In some optional embodiments, the set power range is 200W to 1000W.

In some optional embodiments, the radio frequency defrosting device further includes: a power detection unit and a power adjustment unit;

The power detection unit is disposed between the defrosting cavity and the housing, and is configured to detect the incident power of radio frequency and the reflected power reflected by the defrosting cavity;

The power adjustment unit is connected to the radio frequency source and is configured to adjust the power of the radio frequency source to transmit radio frequency according to the incident power and the reflected power.

In some optional embodiments, the radio frequency defrosting device further includes: a power detection unit and a power adjustment unit;

The power detection unit is disposed between the defrosting cavity and the housing, and is configured to detect the incident power of radio frequency and the reflected power reflected by the defrosting cavity;

The power adjustment unit is connected to the radio frequency power amplifier, and is configured to adjust the radio frequency power amplified by the radio frequency power amplifier according to the incident power and the reflected power.

In some optional embodiments, the number of the radio frequency antennas is two or more;

The radio frequency defrosting device further includes: a partition plate disposed between adjacent radio frequency antennas.

In some optional embodiments, the material of the partition is the same as the material of the inner wall of the defrosting chamber.

In some optional embodiments, the material of the inner wall of the thawing chamber is stainless steel. A smooth transition connection between adjacent side walls of the defrosting cavity.

In some optional embodiments, the radio frequency defrosting device further includes: a heat dissipation fan provided between the defrosting cavity and the housing;

The casing is provided with an air inlet and an air outlet.

In some optional embodiments, the heat dissipation fan and the RF power amplifier are disposed between the bottom of the defrosting chamber and the housing.

In some optional embodiments, the radio frequency antenna is disposed on the inner wall at the bottom of the defrosting cavity.

In some optional embodiments, the radio frequency defrosting device further includes: a door body embedded with wire glass.

The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

The radio frequency defrosting device provided by the embodiment of the present disclosure includes a defrosting cavity, a housing, a radio frequency source, a radio frequency power amplifier and a radio frequency antenna. The radio frequency source is connected to the radio frequency power amplifier. The radio frequency power amplifier amplifies the radio frequency power generated by the radio frequency source to a set power, and The radio frequency antenna radiates into the defrosting cavity, and the strong radio frequency penetration rate makes the temperature of the defrosted food heat up steadily. The radio frequency antenna radiates into the defrosting cavity to improve the heating uniformity of the defrosted food and improve the defrosting effect.

It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present disclosure.

BRIEF DESCRIPTION

The drawings herein are incorporated into and constitute a part of this specification, show embodiments consistent with this disclosure, and are used together with the specification to explain the principles of this disclosure.

Fig. 1 is a schematic structural diagram of a radio frequency defrosting device according to an exemplary embodiment;

Fig. 2 is a schematic structural diagram of a radio frequency defrosting device according to an exemplary embodiment;

Fig. 3 is a schematic structural diagram of a radio frequency defrosting device according to an exemplary embodiment.

detailed description

The following description and drawings sufficiently illustrate specific embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The examples represent only possible changes. Unless specifically required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or substituted for parts and features of other embodiments. The scope of the embodiments of the present disclosure includes the entire scope of the claims, and all available equivalents of the claims. In this document, various embodiments may be individually or collectively expressed by the term "invention", which is for convenience only, and if in fact more than one invention is disclosed, it is not intended to automatically limit the scope of the application to any A single invention or inventive concept. In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not require or imply that there is any actual relationship between these entities or operations or order. Furthermore, the terms "include", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, or device that includes a series of elements includes not only those elements, but also other items not explicitly listed Elements, or also include elements inherent to such processes, methods, or equipment. Without more restrictions, the element defined by the sentence "include one..." does not exclude that there are other identical elements in the process, method, or equipment that includes the element. The embodiments in this document are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other. For the methods and products disclosed in the embodiments, since they correspond to the method parts disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description in the method part.

The thawing methods for meat thawing mainly include: natural thawing, soaking thawing, refrigeration thawing and microwave thawing. Among them, natural thawing and immersing and thawing use heat conduction from outside to inside, and the thawing temperature is not uniform. Because the external temperature is room temperature, the thawing time is very long, and the external temperature is much higher than 0 degrees Celsius. It is easy to produce blood water during the thawing process, causing nutrient loss, The mouthfeel is reduced and it is easy to breed bacteria. Refrigeration and thawing also adopts the heat conduction method from outside to inside. The external temperature is the refrigerated temperature and the external temperature is controllable. It can automatically stop the thawing at the optimal thawing and the thawing is even. However, because the external temperature is the refrigerated temperature, the thawing time is long. Microwave defrosting can quickly heat food, but it is very easy to produce uneven heating, and even parts of food that are not defrosted will be overheated and cooked.

In daily life, foods with greater difficulty in defrosting are mostly meat. The radio frequency defrosting device provided by the embodiments of the present disclosure is mainly used to solve the problem that it is difficult for the defrosting products in the prior art to ensure the defrosting quality of meat.

FIG. 1 is a schematic structural diagram of a radio frequency defrosting device according to an exemplary embodiment, including: a radio frequency source 1, a radio frequency power amplifier 2, and a radio frequency antenna 3.

Among them, the radio frequency source 1 and the radio frequency power amplifier 2 are disposed between the defrosting cavity and the housing of the radio frequency defrosting device. The radio frequency source 1 is connected to the radio frequency power amplifier 2 and is configured to amplify the radio frequency power generated by the radio frequency source 1 to a set power.

The power of the radio frequency signal generated by the radio frequency source 1 is very small. To shorten the defrosting time for rapid defrosting, the radio frequency source 1 is connected to the radio frequency power amplifier 2, and the radio frequency power amplifier 2 increases the power of the radio frequency signal generated by the radio frequency source 1. The radio frequency antenna 3 is disposed on the inner wall of the defrosting cavity. The radio frequency antenna 3 is connected to the radio frequency power amplifier 2 and is configured to radiate the radio frequency generated by the radio frequency source 1 into the defrosting cavity.

The radio frequency antenna 3 is responsible for radiating the radio frequency signal generated by the radio frequency source 1 and boosted by the radio frequency power amplifier 2 into the defrosting cavity, and is configured to heat the food to be defrosted. After passing through the RF power amplifier 2, the RF frequency radiated into the defrosting cavity is 380MHz-480MHz. Optionally, the radio frequency radiated into the defrosting cavity is 380MHz, 400MHz, 420MHz, 425MHz, 430MHz, 435MHz, 440MHz, 460MHz or 480MHz. The set power is 200W-1000W. Optionally, set the power to 200W, 400W, 450W, 500W, 550W, 600W, 800W or 1000W.

The radio frequency defrosting device provided by the embodiment of the present disclosure includes a defrosting cavity, a housing, a radio frequency source, a radio frequency power amplifier and a radio frequency antenna. The radio frequency source is connected to the radio frequency power amplifier. The radio frequency power amplifier amplifies the radio frequency power generated by the radio frequency source to a set power, and The radio frequency antenna radiates into the defrosting cavity, and the strong radio frequency penetration rate makes the temperature of the defrosted food heat up steadily. The radio frequency antenna radiates into the defrosting cavity to improve the heating uniformity of the defrosted food and improve the defrosting effect.

The industry usually uses 13MHz, 27MHz, 40MHz, 433MHz, 915MHz, 2450MHz frequency band to heat food. Generally speaking, 13MHz, 27MHz, 40MHz because of the low frequency, low electromagnetic energy utilization rate, defrosting food requires more power, so, The frequency bands of 13MHz, 27MHz, and 40MHz are more suitable for industrial scenes. In daily life, microwave ovens and other defrosting devices commonly use 433MHz, 915MHz, and 2450MHz to heat food.

The following Table 1 is the experimental data obtained based on multiple implementations, among which are the penetration depth of electromagnetic waves of different frequencies (430MHz, 915MHz and 2450MHz) to food:

Table 1

Ingredients	430MHz	900MHz	2450MHz
Raw pork	4.7cm	2.2cm	0.8cm
raw beef	4.9cm	2.3cm	0.9cm
Cooked beef	6.5cm	3.1cm	1.2cm
Cod	6.9cm	3.3cm	1.2cm
Mashed potatoes	4.0cm	1.9cm	0.7cm
carrot	5.2cm	2.5cm	0.9cm

It can be seen that between the frequencies of 430MHz, 900MHz, and 2450MHz, the penetration depth of the electromagnetic wave with a smaller frequency of 430MHz is more suitable for thawing high-weight and bulky food. The radio frequency defrosting device provided by the embodiment of the present disclosure radiates into the defrosting cavity with a radio frequency of 380MHz to 480MHz, which has good penetration of food during the defrosting process, and can achieve uniform heating of the inside and outside of the food at the same time to achieve The defrosted food heats up steadily inside and outside, can quickly defrost the food, and the juice is rarely lost, and the color is less.

In daily life, it is generally believed that the ideal stop temperature for thawing is between -4 and 0 degrees Celsius. Meat thawing to this temperature range is easy to cut, with little juice loss and discoloration. During the experiment, using various thawing methods and microwave ovens with different powers to defrost 3.5 kg beef at -18 degrees Celsius, and the temperature of the center of the meat filling was raised to 0 degrees Celsius as the criterion for determining the end of thawing. The test results in Table 2 below were obtained. :

Table 2

In Table 2, the defrosting time is the average value obtained from multiple tests, and the temperature difference is the temperature difference between the ambient temperature of the defrosted food and the temperature inside the defrosted food during the defrosting process. Optionally, the temperature of the defrosted food is monitored in real time by an infrared temperature measuring device.

It can be clearly seen from the experimental results that the RF defrosting device provided by the embodiments of the present disclosure is used to defrost food, and the radio frequency penetration is strong, so that the inside and outside of the food can be heated uniformly at the same time. During the thawing process, the power radiated into the thawing cavity is in the range of 200W to 1000W, and the thawing time is short, to avoid the outflow of juice during the thawing process, the thawing efficiency is high, and the nutritional components of the food will not be damaged after thawing, especially for meat, There is no obvious whitening on the surface of the meat after thawing, which guarantees the taste of the meat after thawing.

In some optional embodiments, as shown in FIG. 2, the radio frequency defrosting device further includes a power detection unit 41 and a power adjustment unit 51.

The power detection unit 41 is disposed between the defrosting cavity and the housing, and is configured to detect the incident power of radio frequency and the reflected power reflected by the defrosting cavity.

The power adjustment unit 51 is connected to the radio frequency source 1 and is configured to adjust the power of the radio frequency source 1 to emit radio frequency according to the incident power and the reflected power.

When the quality of the defrosted food is small, the proportion of radio frequency absorption is small, and the situation of large reflected power is prone to occur. The reflected power is large and there is a danger of damaging the radio frequency amplifier. The power adjustment unit 51 is connected to the radio frequency source 1 to reduce the transmission power of the radio frequency source 1 or stop transmitting radio frequency.

In some optional embodiments, as shown in FIG. 3, the radio frequency defrosting device further includes a power detection unit 42 and a power adjustment unit 52.

The power detection unit 42 is disposed between the defrosting cavity and the housing, and is configured to detect the incident power of radio frequency and the reflected power reflected by the defrosting cavity.

The power adjustment unit 52 is connected to the radio frequency power amplifier 2 and is configured to adjust the power of the radio frequency amplified by the radio frequency power amplifier 2 according to the incident power and the reflected power.

When the quality of the defrosted food is small, the proportion of radio frequency absorption is small, and the situation of large reflected power is prone to occur. The reflected power is large and there is a danger of damaging the RF amplifier. The power adjustment unit 52 is connected to the RF power amplifier 2 to reduce the amplification factor of the RF power by the RF power amplifier 2.

In some optional embodiments, the number of radio frequency antennas 3 is two or more. The larger the volume of the radio frequency thawing device, the greater the number of radio frequency antennas 3. The multiple radio frequency antennas 3 enable the electromagnetic wave energy generated by the radio frequency to be more uniformly radiated to the defrosted food, shorten the defrosting time, and improve the defrosting efficiency.

In some optional embodiments, when the number of the radio frequency antennas 3 is two or more, in order to prevent the radio frequency antenna 3 from absorbing the radio frequency radiated by other radio frequency antennas 3, there are provided between adjacent radio frequency antennas 3 Ground baffle. The partition plate prevents the radio frequency antenna 3 from absorbing the radio frequency radiated from other radio frequency antennas 3, improves the service life of the radio frequency antenna 3, and at the same time improves the electromagnetic wave energy utilization rate and improves the freezing efficiency.

The material of the partition is the same as the material of the inner wall of the defrosting chamber. The material of the partition and the material of the inner wall of the defrosting chamber are stainless steel. Avoid water droplets on the heated food to cause the heating cavity to rust and affect the service life of the pyrolysis device. In some optional embodiments, the partition may be provided on the inner wall of the defrosting chamber through an integral molding process. To avoid a gap between the partition and the inner wall of the defrosting cavity, the radio frequency antenna 3 absorbs the radio frequency radiated by other radio frequency antennas 3, thereby reducing the utilization rate of electromagnetic wave energy. In some optional embodiments, the baffle may be provided on the inner wall of the defrosting chamber through a welding process to improve the stability of the baffle.

In some optional embodiments, the smooth transition between adjacent side walls of the defrosting chamber is avoided to prevent radio frequency from collecting within the angle between the adjacent side walls, causing local temperature to be too high and reducing the quality of defrosting the video.

In some optional embodiments, the radio frequency defrosting device further includes: a cooling fan. The shell is provided with an air inlet and an air outlet, and a heat dissipation fan is provided between the defrosting cavity and the shell. During the defrosting process, the RF power amplifier 2 itself continues to rise in temperature during the process of amplifying the RF power. As the temperature increases, the RF power amplifier 2 has a large loss and the working efficiency decreases. The cooling fan is used to cool the RF power amplifier 2, improve the defrosting efficiency, reduce the loss of the RF power amplifier 2, and extend the service life of the RF defrosting device.

In order to reduce the loss of radio frequency in the heating cavity, the radio frequency antenna 3 is arranged on the inner wall of the bottom of the defrosting cavity. In order to reduce the length of the connecting line between the radio frequency antenna 3 and the radio frequency power amplifier 2, the radio frequency power amplifier 2 is disposed between the bottom of the defrosting cavity and the housing. In order to speed up the cooling rate of the RF power amplifier 2, a cooling fan is arranged between the bottom of the defrosting cavity and the housing.

In some optional embodiments, in order to facilitate real-time viewing of the defrosted food in the defrosting cavity and avoid electromagnetic wave leakage, glass is embedded on the door body of the radio frequency defrosting device. Due to the strong penetration of radio frequency, it is possible to prevent the radio frequency from penetrating the glass and causing harm to the human body. The glass is wire glass.

In some optional embodiments, an elastic sealing structure is adopted between the door body of the radio frequency defrosting device and the radio frequency defrosting cavity to compensate for electromagnetic leakage that may be caused by processing errors and assembly errors of the door body and cavity, and improve the safety of the radio frequency defrosting device.

In the embodiments disclosed herein, it should be understood that the disclosed methods and products (including but not limited to devices, equipment, etc.) may be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a division of logical functions. In actual implementation, there may be other divisions, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

It should be understood that the flowcharts and block diagrams in the drawings show possible implementation architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, program segment, or part of code that contains one or more of the Executable instructions. It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can also be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and/or flowcharts, and combinations of blocks in the block diagrams and/or flowcharts, can be implemented with dedicated hardware-based systems that perform specified functions or actions Or, it can be realized by a combination of dedicated hardware and computer instructions. The present disclosure is not limited to the flow and structure already described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A radio frequency defrosting device is characterized by comprising: a defrosting cavity, a radio frequency source, a radio frequency power amplifier and a radio frequency antenna;

   The radio frequency power amplifier is connected to the radio frequency source and is configured to amplify the radio frequency power generated by the radio frequency source to a set power;

   The radio frequency antenna is connected to the radio frequency power amplifier and is configured to radiate the radio frequency generated by the radio frequency source into the defrosting cavity.
2. The device according to claim 1, wherein the set power range is 200W to 1000W.
3. The device according to claim 1, further comprising: a power detection unit and a power adjustment unit;

   The power detection unit is configured to detect the incident power of radio frequency and the reflected power reflected by the defrosting cavity;

   The power adjustment unit is connected to the radio frequency source and is configured to adjust the power of the radio frequency source to transmit radio frequency according to the incident power and the reflected power.
4. The device according to claim 1, further comprising: a power detection unit and a power adjustment unit;

   The power detection unit is configured to detect the incident power of radio frequency and the reflected power reflected by the defrosting cavity;

   The power adjustment unit is connected to the radio frequency power amplifier, and is configured to adjust the radio frequency power amplified by the radio frequency power amplifier according to the incident power and the reflected power.
5. The device according to claim 1, wherein the number of the radio frequency antennas is two or more;

   The radio frequency defrosting device further includes: a partition plate disposed between adjacent radio frequency antennas.
6. The device according to claim 5, wherein the material of the partition is the same as the material of the inner wall of the defrosting chamber.
7. The device according to claim 1, further comprising: a housing and a heat dissipation fan provided between the defrosting chamber and the housing;

   The casing is provided with an air inlet and an air outlet.
8. The device of claim 7, wherein the heat dissipation fan and the RF power amplifier are disposed between the bottom of the defrosting chamber and the housing.
9. The device of claim 8, wherein the radio frequency antenna is disposed on the inner wall of the bottom of the defrosting cavity.
10. The device according to claim 1, further comprising: a door body provided with wire glass.

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