CN213246673U - Thawing equipment - Google Patents

Abstract

The utility model discloses a know equipment of freezing, include: a thawing cavity; a door body; a power supply module; a radio frequency generation module configured to generate a radio frequency signal; the antenna array is positioned on the inner wall of the unfreezing cavity and is electrically connected with the radio frequency generation module; and the antenna array comprises: first antenna and the second antenna of symmetrical arrangement, it is the monopole antenna of metal material, and every includes respectively in first antenna and the second antenna: a vertical arm; the transverse part is positioned at the top end of the vertical arm and comprises a first transverse arm, a second transverse arm and a third transverse arm which are sequentially connected in a U shape, and the free end part of the first transverse arm is connected with the top end of the vertical arm; the U-shaped opening of the transverse part of the first antenna is opposite to the U-shaped opening of the transverse part of the second antenna; and the control unit is connected with the radio frequency generation module. The utility model discloses utilize wide operating band and the good antenna array of isolation, improve thawing apparatus efficiency of unfreezing, shorten and eat material thawing time.

Description

Thawing equipment

Technical Field

The utility model relates to a radio frequency technical field that unfreezes, concretely relates to equipment of unfreezing.

Background

A freezing chamber of a common household refrigerator (the temperature of the chamber of the freezing chamber is generally-18 ℃) is used for storing food materials which are not eaten in a short time, particularly various meats, before a user cooks the food materials stored in the freezing chamber, the frozen food materials are usually required to be thawed to be about-5 ℃, the meat at the temperature is convenient to cut, the meat is not cut because of over-low temperature and is not easy to cut, and the cut meat blocks or meat slices are not shaped.

In the prior art, the air thawing operation is simple, but the thawing time is too long, the surface of the food material is easily oxidized, and the juice loss after thawing is serious; the water thawing not only takes long time, but also bacteria, microorganisms and the like are easy to breed on the surface of the food during the thawing process, and the food quality is seriously influenced; the heating wire or the heating pipe is unfrozen, the heating efficiency is low, and the temperature of the unfrozen food material is uneven.

When the microwave oven based on the magnetron technology unfreezes food materials, the magnetron generates electromagnetic waves, the electromagnetic waves are transmitted to the waveguide stirring system through the waveguide tube, the waveguide stirring system couples the electromagnetic wave energy into the cavity of the microwave oven through the gap coupling, and when the electromagnetic waves are coupled into the cavity of the microwave oven as much as possible, the impedance matching between the waveguide stirring system and the cavity of the microwave oven needs to be good as much as possible. However, the matching performance is determined by the shape and size of the coupling hole on the microwave oven cavity, once formed, the electrical performance is fixed, and only under specific conditions, the best matching can be achieved, and the efficiency can be maximized. In actual use, however, the type, shape, size, etc. of food to be thawed are changed, and these factors affect the matching performance of the microwave oven, thereby affecting the efficiency thereof. The microwave oven cannot achieve high heating efficiency due to the special working principle of the microwave oven.

Disclosure of Invention

An object of the utility model is to provide thawing equipment, it utilizes wide operating band and the good antenna array of isolation, realizes and the good matching of cavity that unfreezes for improve thawing equipment efficiency of unfreezing, shorten and eat material thawing time.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme to realize:

a thawing apparatus, comprising: a thawing cavity defining a space for placing a product to be thawed; the door body is arranged at the taking and placing opening of the unfreezing cavity and used for opening and closing the taking and placing opening of the unfreezing cavity; characterized in that, the thawing apparatus further comprises: a power supply module which supplies power to a power utilization component in the thawing apparatus; a radio frequency generation module configured to generate a radio frequency signal; the antenna array is positioned on the inner wall of the unfreezing cavity and is electrically connected with the radio frequency generation module; and the antenna array comprises: first antenna and the second antenna of symmetrical arrangement, it is the monopole antenna of metal material, every in first antenna and the second antenna includes respectively: a vertical arm; the transverse part is positioned at the top end of the vertical arm and comprises a first transverse arm, a second transverse arm and a third transverse arm which are sequentially connected in a U shape, and the free end part of the first transverse arm is connected with the top end of the vertical arm; the U-shaped opening of the transverse part of the first antenna is opposite to the U-shaped opening of the transverse part of the second antenna; and the control unit is connected with the radio frequency generation module.

The thawing apparatus as described above, wherein the first antenna and the second antenna have a gap therebetween.

As the thawing apparatus described above, the first antenna and the second antenna each have a square, oval or circular cross-sectional shape.

The thawing apparatus as described above, wherein the first lateral arm is vertically butted with the vertical arm and the second lateral arm, respectively, and the third lateral arm is parallel to the first lateral arm.

In the antenna array described above, the length of the first transverse arm is longer than the length of the third transverse arm.

According to the thawing equipment, the thawing cavity is a metal cavity, and the thawing cavity is grounded.

The thawing apparatus as described above, wherein the antenna array is mounted on an inner wall of the thawing cavity.

The thawing apparatus further comprises a protective casing covering the antenna array and fixed to the inner wall of the thawing cavity.

The thawing apparatus as described above, wherein the antenna array is mounted on the top inner wall of the thawing cavity.

According to the thawing device, the first antenna and the second antenna are formed by bending the copper cylinder with a circular cross section.

According to the thawing equipment, the antenna array is used for radiating the radio-frequency signals, and the antenna array has a wider working frequency band, so that the antenna array can be flexibly adjusted to form good matching with a thawing cavity, more energy is radiated into the thawing cavity, the thawing efficiency is improved, and the thawing time of food materials is shortened; and the antenna array comprises the first antenna and the second antenna which are symmetrically arranged, so that the isolation degree is good, and the antenna array is further ensured to have higher unfreezing efficiency.

Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when read in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a structural diagram of an antenna array in an embodiment of the thawing apparatus of the present invention;

fig. 2 is a schematic block diagram of an embodiment of the thawing apparatus according to the present invention;

fig. 3 is a simulation diagram of thawing efficiency of thawing beef in the embodiment of the thawing apparatus provided by the utility model.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "inner", "outer", "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Radio frequency thawing is a novel thawing mode, electric field energy is converted into electromagnetic wave energy through a radio frequency antenna, an electromagnetic field is formed around the radio frequency antenna, water molecules exist in food materials to be thawed, and the water molecules are polar molecules, so that dipoles are formed under the action of the electromagnetic field, and the water molecules swing along with the high-frequency alternating electromagnetic field at the frequency of hundreds of millions of times per second. The molecules are rearranged along with the high-frequency electromagnetic field with constantly changing directions, so that the interference and obstruction caused by the original thermal motion of the molecules and the interaction between the molecules must be overcome, violent friction is generated in the process, and electromagnetic energy is converted into heat energy through friction, so that the aim of quick thawing is fulfilled.

For the radio frequency antenna required by radio frequency thawing, the matching performance is good firstly, so that more electromagnetic wave energy can be radiated; and secondly, for the antenna array, the isolation between the antennas is improved, and the crosstalk of radiation energy between the antennas is avoided.

The present embodiment relates to a thawing apparatus (not shown) having a thawing chamber (not shown), a door body (not shown), an antenna array 100, a power supply module 200, a radio frequency generation module 300, and a control unit 400.

The thawing cavity defines a space for placing products to be thawed (such as beef, pork, chicken and the like), and has a taking and placing opening for taking and placing the products to be thawed, and the taking and placing opening is provided with a door body for opening/closing the taking and placing opening.

When the door body is closed, the unfreezing cavity is in a closed state.

The structure of the antenna array 100 is described with reference to fig. 1.

The antenna array 100 of the present embodiment includes a first antenna 110 and a second antenna 120 which are symmetrically arranged. The first antenna 110 and the second antenna 120 are both metallic monopole antennas, and the monopole antennas have broadband characteristics.

Thus, when the antenna array 100 is used as a unfreezing radio frequency antenna and is arranged in unfreezing equipment, the matching frequency points of different food materials to be unfrozen can be flexibly adjusted in a wide range of working frequency bands, the unfreezing efficiency of the antenna array is improved, and the wide range of working frequency bands can meet the requirements of the matching frequency points of various food materials.

The first antenna 110 and the second antenna 120 are symmetrically arranged and have the same structure.

The structure of the first antenna 110 will be described as an example.

In the present embodiment, the first antenna 110 has a vertical arm 111 located on a vertical plane and a lateral portion located on a lateral plane, the vertical plane being perpendicular to the lateral plane.

The transverse part comprises a first transverse arm 112, a second transverse arm 113 and a third transverse arm 114, and the first transverse arm 112, the second transverse arm 113 and the third transverse arm 114 are sequentially connected and connected to form a U shape.

The free end of the first transverse arm 112 is connected to the top end of the vertical arm 111.

The U-shaped opening of the U-shaped portion of the lateral portion of the first antenna 110 is opposite to the U-shaped opening of the U-shaped portion of the lateral portion of the second antenna 120.

The first antenna 110 and the second antenna 120 have a gap therebetween.

In this embodiment, the first antenna 110 and the second antenna 120 are both metal antennas, which may be formed by bending a copper pillar, or may be formed by processing a sheet metal part, and the cross-sectional shape of each of the antennas may be a circle, an ellipse, or a square, and is preferably a circle or an ellipse, but is not limited to cross-sections of other shapes.

In this embodiment, the first antenna 110 and the second antenna 120 are formed by bending copper cylinders with a diameter of 3mm, and certainly, metal cylinders with other diameters may be selected and bent, which is not limited herein.

The first antenna 110 and the second antenna 120 are symmetrically distributed and are both mounted to the same mounting surface, which may be the actual ground or an artificial ground such as a vehicle body of a vehicle.

The first antenna 110 and the second antenna 120 are both installed on the inner wall of the thawing cavity, and the thawing cavity is grounded, so as to prevent the radio frequency power from leaking to the outside of the cavity.

The antenna array 100 may preferably be disposed at the top inner wall of the thawing chamber to improve the uniformity of the temperature of the product to be thawed. The antenna array 100 may be preferably arranged such that when the door body is in the closed state, the antenna array 100 is axially symmetrical with respect to the vertical center of the door body, so as to further uniformly thaw the product to be thawed.

In this embodiment, a protective casing (not shown) is further provided, which is used to cover the outside of the antenna array 100 and is fixed to the inner wall of the thawing cavity, so as to prevent the antenna array from being damaged by the user's touch and prolong the service life of the antenna array. The protective case may be made of a non-transparent insulating material to prevent the user from seeing the antenna array 100 and affecting its aesthetic appearance.

The first antenna 110 and the second antenna 120 are monopole antennas, symmetrically arranged and shared, so that the two antennas can work as the same dipole antenna, and because electromagnetic waves have polarization characteristics, when the first antenna 110 and the second antenna 120 are symmetrically arranged, the polarization characteristics of the electromagnetic waves generated by the first antenna 110 and the second antenna 120 are just opposite (that is, the first antenna 110 and the second antenna have a phase difference of 180 °), so that a signal radiated by one antenna is not easily received by the other antenna, thereby improving the isolation between the first antenna 110 and the second antenna 120.

In the present embodiment, referring to fig. 1, the first transverse arm 112 is vertically butted with the vertical arm 111 and the second transverse arm 113, respectively, the third transverse arm 114 is parallel to the first transverse arm 112, one end of the first transverse arm 112 is connected with the top end of the vertical arm 111, the other end of the first transverse arm 112 is connected with one end of the second transverse arm 113, and the other end of the second transverse arm 113 is connected with the third transverse arm 114.

As shown in fig. 1, the length of the third transverse arm 114 is shorter than the length of the first transverse arm 112.

According to the determined volume of the thawing cavity, the height and the size of the antenna array 100 are adjusted and designed through S parameter (namely scattering parameter) simulation, good matching with the thawing cavity is achieved, and the antenna array 100 is high in isolation degree, good matching degree and isolation degree, so that the antenna array 100 can have high thawing efficiency, and thawing time is shortened.

The power module 200 supplies power to the electric components in the thawing apparatus, specifically, the rf generation module 300 and the control unit 400.

The rf generation module 300 is connected to the control unit 400 and the antenna array 100, respectively, and specifically, the rf generation module 300 is configured to generate rf signals.

The radio frequency signal emitted by the radio frequency generation module 300 transmits radio frequency energy to the first antenna 110 and the second antenna 120 in the antenna array 100 through a radio frequency cable (not shown), and since the first antenna 110 and the second antenna 120 are respectively disposed on the inner wall of the thawing cavity, a part of the radio frequency energy is radiated by the first antenna 110 and the second antenna 120 to the food material in the thawing cavity to be absorbed, so as to thaw the food material, and another part of the radio frequency energy is reflected back to the radio frequency generation module 300 through the first antenna 110, the second antenna 120 and the radio frequency cable.

The rf generation module 300 is capable of detecting the incident powers P1 and P2 of the first antenna 110 and the second antenna 120 and the reflected powers PF1 and PF2 in real time, and calculating the thawing efficiency η according to the incident powers P1 and P2 and the reflected powers PF1 and PF2, where η is obtained by the following calculation equation.

η=((1-10^((PF1-P1)/10))+(1-10^((PF2-P2)/10)))/2。

According to the thawing efficiency η, the control unit 400 controls and adjusts the incident power output from the rf generating module 300 to the first antenna 110 and the second antenna 120, so as to find the best matching frequency point within the working frequency band of the antenna array 100, thereby obtaining a higher thawing efficiency.

The rf generating module 300 of this embodiment may adopt an rf generating module in the prior art, which may be a solid-state power source capable of generating an rf signal, and the solid-state power source may be precisely controlled by a chip to realize frequency and/or power adjustment. And in order to implement the measurement of the incident power and the reflected power, the rf generation module 300 may be integrally provided with a measurement unit, which may be implemented by using a unit for measuring power according to the related art.

For different food materials, because different food materials have different weight, water content and component composition and different dielectric and electrical properties, when the food materials are placed into a thawing cavity to thaw, the antenna array 100 is affected differently, so that the optimal matching frequency of the antenna array 100 changes. Different food materials may affect the best matching frequency point of the antenna array 100, but still be within the working frequency band of the antenna array 100.

For the same food material, in the thawing process, due to different temperatures, the electrical properties such as the dielectric property of the food material are also continuously changed, so that the optimal matching frequency point is also changed along with the change, but still located in the working frequency band of the antenna array 100.

The control unit 400 and the radio frequency generation module 300 can ensure that the antenna array 200 always works at the best matching frequency point in the thawing process, so that high thawing efficiency is maintained when different food materials are heated and thawed, and meanwhile, higher thawing efficiency is maintained all the time in the food material thawing process, thereby being beneficial to improving the food material thawing speed.

This embodiment shows an embodiment of an antenna array 100, and 5Kg of beef is defrosted by using the antenna array 100, and a simulation graph of defrosted efficiency is shown in fig. 3.

For the volume of the thawing chamber: 450mm in length, 435mm in width and 220mm in height, the dimensions of the antenna array 100 in the present embodiment are determined as follows.

The first antenna 110 and the second antenna 120 in the antenna array 100 are both formed by bending copper cylinders with a diameter of 3 mm. And the vertical arm 111 of the first antenna 110 and the second antenna 120 has a length of 57mm, the first transverse arm 112 is 157mm, the second transverse arm 113 is 143mm, and the third transverse arm 114 is 111 mm. And the first transverse arm 112 of each antenna is vertically butted with the vertical arm 111 and the second transverse arm 113 respectively, and the third transverse arm 114 is parallel to the first transverse arm 112.

When the first antenna 110 and the second antenna 120 are symmetrically distributed, the distance between the vertical arm 111 of the first antenna 110 and the vertical arm 111 of the second antenna 120 is 80 mm.

Referring to fig. 3, the maximum efficiency of the antenna array 100 above can reach 89% at a frequency of 433MHz (as shown at point m2 in fig. 3) with 5Kg of beef placed in the thawing cavity, and the efficiency is greater than 79% in the operating band of 422MHz-443MHz, as shown at points m1 and m3 in fig. 3.

In addition, the antenna 100 used in the thawing apparatus of the present embodiment has a simple structure, is easy to process, has a low cost, and is suitable for large-scale industrial production.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or that equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention, which is claimed.

Claims (10)

1. A thawing apparatus, comprising:

a thawing cavity defining a space for placing a product to be thawed;

the door body is arranged at the taking and placing opening of the unfreezing cavity and used for opening and closing the taking and placing opening of the unfreezing cavity;

characterized in that, the thawing apparatus further comprises:

a power supply module which supplies power to a power utilization component in the thawing apparatus;

a radio frequency generation module configured to generate a radio frequency signal;

the control unit is connected with the radio frequency generation module;

the antenna array is positioned on the inner wall of the unfreezing cavity and is electrically connected with the radio frequency generation module; and the antenna array comprises: first antenna and the second antenna of symmetrical arrangement, it is the monopole antenna of metal material, every in first antenna and the second antenna includes respectively:

a vertical arm;

the transverse part is positioned at the top end of the vertical arm and comprises a first transverse arm, a second transverse arm and a third transverse arm which are sequentially connected in a U shape, and the free end part of the first transverse arm is connected with the top end of the vertical arm;

the U-shaped opening of the transverse portion of the first antenna is opposite to the U-shaped opening of the transverse portion of the second antenna.

2. The thawing apparatus of claim 1, wherein the first antenna and the second antenna have a gap therebetween.

3. The thawing apparatus of claim 1, wherein the first and second antennas are each square, oval, or circular in cross-sectional shape.

4. The thawing apparatus of claim 1, wherein the first transverse arm is vertically docked with the vertical arm and the second transverse arm, respectively, and the third transverse arm is parallel to the first transverse arm.

5. Thawing apparatus according to claim 4, characterized in that said first transversal arm has a length longer than the length of said third transversal arm.

6. The thawing apparatus of claim 1, wherein the thawing chamber is a metal chamber and the thawing chamber is grounded.

7. The thawing apparatus of claim 6, wherein the antenna array is mounted on an inner wall of the thawing cavity.

8. The thawing apparatus of claim 6, further comprising:

and the protective shell covers the antenna array and is fixed on the inner wall of the unfreezing cavity.

9. The thawing apparatus of claim 7, wherein the antenna array is mounted on a top interior wall of the thawing cavity.

10. The thawing apparatus of claim 1, wherein the first antenna and the second antenna are each bent from a copper cylinder having a circular cross-section.

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