CN109430675B - A high-frequency thawing device and a high-frequency thawing method - Google Patents

Abstract

The invention provides a high-frequency thawing device and a high-frequency thawing method. The high-frequency thawing device includes a thawing cabin, the thawing cabin includes a thawing area, and the thawing area includes a positive electrode plate group and a negative electrode plate that are parallel to each other, wherein the positive plate group includes two Or more than two positive plates, the anode of the high-frequency generator is connected to each positive plate of the positive plate group, the cathode and negative plate of the high-frequency generator are both grounded, and the positive plate group and negative plate are exerted through the high-frequency generator High-frequency electric energy is used to defrost frozen food, in which each positive plate can adjust the distance from the negative plate. In the present invention, the plate surfaces of the positive plate and the negative plate are smaller than the cross-section of the frozen food along the direction of the plate surface, and the corners of the positive plate have arc transitions to further reduce the edge effect. The edge of the positive plate can be bent upward, which also reduces the edge effect and achieves uniform thawing.

Description

A high-frequency thawing device and a high-frequency thawing method

Technical field

The present invention relates to the field of high-frequency applications, and specifically to a high-frequency thawing device and a high-frequency thawing method.

Background technique

High-frequency heating thawing is a new way of thawing frozen food. It uses the dielectric properties of food to heat the food in a high-frequency cavity to achieve the purpose of thawing. Compared with other thawing methods, high-frequency heating thawing has a fast thawing speed, uniform heating, and less impact on the quality of food. This high-frequency wave thawing device supplies high-frequency electric energy generated by a high-frequency oscillator to the frozen food through the opposite electrodes while the frozen food is clamped between a pair of opposing electrodes, and uses the provided high-frequency electric energy to generate The electric induction heating makes the frozen food clamped between the opposite electrodes defrost.

However, in this case where the electrodes are opposite, since the high-frequency energy tends to concentrate on the boundary of the medium, that is, the angular edge parts of the frozen food, these parts are easier to be heated than other parts, so the frozen food cannot be evenly heated. Thawing problem. Especially when the frozen food is meat, since the fat contained in the meat has high dielectric loss and conductivity, in addition to high-frequency electric induction heating, it is also heated by Joule heat. Therefore, when the fat is located on the angular edge portion of the frozen meat, the angular edge portion of the thawed meat will be in a cooked state, resulting in an unfavorable situation that reduces the value of the product.

Therefore, it is necessary to develop a high-frequency thawing device that can defrost frozen food evenly, but there is currently no technology in this area.

Contents of the invention

The high-frequency thawing device of the present invention uses multiple positive plates, and the plate surface increases in the direction away from the negative plate, and the plate surface of all positive plates is smaller than the cross-section of the frozen food along the plate direction. According to the distance between the positive plates Different distances between the negative plates have different heating electric fields. The positive plates that are farther away from the negative plate and have a larger plate surface have a smaller heating electric field. The positive plates that are closer to the negative plate and have a smaller plate surface have a larger heating electric field. . The superposition of multiple heating electric fields makes the combined heating electric fields uniformly applied to the interior and edges of the frozen food, making the thawing speed of the entire frozen food tend to be uniform. Moreover, the corners of the positive plate have arc transitions to further reduce edge effects. The edge of the positive plate can be bent away from the negative plate, which can also reduce the edge effect.

The technical solution is as follows:

A high-frequency thawing device, including: a thawing cabin, the thawing cabin includes a shell and a thawing area arranged in the shell, the thawing area includes a positive electrode plate group and a negative electrode plate that are parallel and aligned with each other, wherein the positive plate group It includes two or more positive plates, and the positive plates are spaced apart in the direction of the negative plate in a manner that the plate surface decreases successively; a high-frequency generator, the anode of which is connected to each positive plate of the positive plate group, and the high-frequency generator The cathode and the negative plate of the generator are both grounded, and the high-frequency generator applies high-frequency electric energy to the positive plate group and the negative plate to defrost the frozen food, wherein each positive plate can adjust the distance between the positive plate and the negative plate. distance.

A high-frequency thawing device, including: a thawing cabin, the thawing cabin includes a shell and a thawing area arranged in the shell, the thawing area includes a positive plate and a negative plate that are parallel to each other, and a high-frequency generator, the anode of which is connected to the positive plate. , the cathode and the negative plate of the high-frequency generator are both grounded, and the high-frequency generator applies high-frequency electric energy to the positive plate and the negative plate to defrost the frozen food, wherein the size of the positive plate is smaller than the edge of the frozen food The cross-sectional size in the direction of the positive plate; wherein the distance between the positive plate and the negative plate is adjustable.

Preferably, multiple thawing areas form a thawing block, and the uppermost positive plate of all positive plate groups in each thawing block forms an integral flat plate.

Preferably, in the thawing area, at least the edge of the lowermost positive plate is bent in a direction away from the negative plate; the edge of the negative plate is bent in a direction away from the positive plate; and the four corners of the negative plate and at least one positive plate have rounded edges. arc transition.

Preferably, in the thawing area, the lowermost positive plate can be inclined relative to the upper surface of the frozen food, and the distance between the lower position of the frozen food surface and the lowermost positive plate is greater than the distance between the higher position of the frozen food surface and the frozen food surface. The distance between the bottom positive plates.

Preferably, in the thawing area, the lowermost positive plate is a flexible plate to adapt to the shape of the upper surface of the frozen food so that the entire frozen food is evenly heated.

Preferably, a conveying mechanism is also provided, and a plurality of frozen foods are conveyed by the conveying mechanism to the thawing area of the corresponding thawing block in the thawing cabin, and are output by the conveying mechanism after thawing is completed.

The present invention also provides a high-frequency thawing method. The above-described high-frequency thawing device is used to perform the following steps: adjusting the distance between the positive plate group and the negative plate so that the distance between the lowest positive plate and the negative plate is suitable for freezing. The size of the food; place the frozen food between the lowermost positive plate and the negative plate; adjust the lowermost positive plate according to the shape of the upper surface of the frozen food, so that the lower position of the frozen food surface is between the lowermost positive plate and the lowermost positive plate. The distance is greater than the distance between the higher position on the surface of the frozen food and the lowermost positive plate; start the high-frequency generator to generate a high-frequency electric field between the positive plate group and the negative plate to defrost, where each positive plate The plate size is smaller than the cross-sectional size of the frozen food along the direction of the positive plate; according to the temperature rise inside and around the edge of the frozen food, adjust the distance between the bottom positive plate and the negative plate to allow the frozen food to thaw evenly.

Preferably, if the edge of the frozen food heats up faster than the inside, adjust the bottom positive plate to reduce the distance between the bottom positive plate and the frozen food; if the edge of the frozen food heats up slower than the inside, adjust the bottom layer Positive plate, increase the distance between the lowest positive plate and frozen food.

Preferably, during the thawing process, the frozen food is thawed by continuous heating or intermittent heating, where the intermittent heating refers to stopping the heating for a period of time to allow heat to be evenly conducted inside the frozen food.

The high-frequency thawing device and high-frequency thawing method of the present invention use multiple positive plates, and the plate areas are gradually increased in the direction away from the negative plate, and the plate areas of all positive plates are larger than the cross-section of the frozen food along the plate direction. Small, depending on the distance between the positive plate and the negative plate, the heating electric field is also different. The positive plate that is far away from the negative plate and has a larger plate area has a smaller heating electric field, and the positive plate that is closer to the negative plate and has a smaller plate area has a smaller electric field. , its heating electric field is larger. The superposition of multiple heating electric fields makes the combined heating electric fields uniformly applied to the interior and edges of the frozen food, making the thawing speed of the entire frozen food tend to be uniform. Moreover, the corners of the positive plate have arc transitions to further reduce edge effects. The edge of the positive plate can be bent upward, which can also reduce the edge effect. Moreover, when only one positive plate and negative plate are used, if the positive plate and negative plate have arc transition and bending structures, and the plate size of the positive plate is smaller than the cross-sectional size of the frozen food along the plate direction, it can also be Get better thawing effect. Moreover, the present invention can also adopt multiple thawing areas, each thawing area is the same as the thawing area in the first embodiment, and can defrost multiple frozen foods at the same time, and can complete the thawing work of large quantities of frozen foods.

Description of the drawings

The above features and technical advantages of the present invention will become clearer and easier to understand by describing the embodiments thereof in conjunction with the following drawings.

Figure 1 is a three-dimensional schematic view of a high-frequency thawing device according to the first embodiment of the present invention;

Figure 2 is a front view of a high-frequency thawing device according to the first embodiment of the present invention;

Figure 3 is a top view of the thawing area according to the first embodiment of the present invention;

Figure 4 is a front view of the thawing cabin related to the first embodiment of the present invention;

Figure 5 is a second front view of the thawing cabin related to the first embodiment of the present invention;

Figure 6 is a schematic diagram of a method for adjusting a positive plate according to the first embodiment of the present invention;

Figure 7 is a schematic diagram of a method for installing a positive electrode plate according to the first embodiment of the present invention;

Figure 8 is a schematic diagram of the bending of the positive electrode plate according to the first embodiment of the present invention;

Figure 9 is a schematic diagram 1 of the positions of the lowermost positive plate and frozen food related to the first embodiment of the present invention;

Figure 10 is a schematic diagram 2 of the positions of the lowermost positive plate and frozen food related to the first embodiment of the present invention;

Figure 11 is a schematic diagram 3 of the positions of the lowermost positive plate and frozen food related to the first embodiment of the present invention;

Figure 12 is a front view of the high-frequency thawing device according to the second embodiment of the present invention;

Figure 13 is a three-dimensional schematic view of a high-frequency thawing device according to the third embodiment of the present invention;

Figure 14 is a side view of the high-frequency thawing device according to the third embodiment of the present invention;

Figure 15 is a top view of the thawing area according to the third embodiment of the present invention;

Figure 16 is a second side view of the high-frequency thawing device according to the third embodiment of the present invention.

Detailed ways

Embodiments of the high-frequency thawing device and the high-frequency thawing method according to the present invention will be described below with reference to the accompanying drawings. Those of ordinary skill in the art will realize that the described embodiments may be modified in various different ways or combinations without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and are not intended to limit the scope of the claims. Furthermore, in this specification, the drawings are not drawn to scale, and the same reference numerals represent the same parts.

First embodiment

The high-frequency thawing device of this embodiment has a box-type structure and is used to defrost a small amount of frozen food. The frozen food is put into the high-frequency thawing device one by one to defrost. As shown in Figures 1 and 2, the box 1 is divided into multiple compartments, which are used to arrange the high-frequency cabin 10, the thawing cabin 11, the electronic control cabin 12, etc. As shown in Figure 1, a high-frequency generator is provided in the high-frequency generating cabin 10 for providing a high-frequency electric field between the positive plate group and the negative plate 111 of the thawing cabin 11, in which elements that generate high-frequency oscillations are installed. Devices, such as vacuum tubes, capacitors, vacuum variable capacitors, inductors and choke coils and their connections, can also be provided with compartments in the high-frequency generating chamber 10 to install high-voltage power supplies and ancillary parts that power the vacuum tubes. , such as high-voltage transformers, silicon stack rectifier bridges, and vacuum tube cooling fans.

The thawing cabin 11 of the high-frequency thawing device will be described in detail below with reference to Figures 2 and 3 . The thawing cabin 11 has a shell, and a thawing area is provided in the shell for thawing the frozen food A. As shown in Figure 2, a positive plate set and a negative plate 111 are arranged horizontally and vertically in the thawing area of the thawing chamber 11. The positive plate set is located above the negative plate 111, and the positive plate set is aligned with the negative plate 111. The positive plate group includes a first positive plate 112 and a second positive plate 113. The first positive plate 112 is located above the second positive plate 113, and the plate surface of the first positive plate 112 is larger than the plate surface of the second positive plate 113. That is, toward the direction of the negative plate, the size of the positive plate decreases successively. Each positive plate and negative plate can be in various planar shapes such as rectangular and square, but is preferably rectangular. The anode of the high-frequency generator is connected to the first positive plate 112 and the second positive plate 113 through, for example, a thin copper sheet. The cathode and negative plate 111 of the high-frequency generator are both grounded, that is, connected to the box 1. The positive plate group is connected to the box 1. The negative plate 111 forms a heating capacitor. Preferably, the anode of the high-frequency generator is connected to the first positive plate 112 and the second positive plate 113 through a coupling capacitor. By applying a predetermined voltage to the anode of the high-frequency generator, a high-frequency wave can be generated between the positive plate group and the negative plate 111. The high-frequency wave has a good penetration depth and can allow the frozen food A to be defrosted preferentially from the internal position that is most difficult to defrost.

Considering that the thickness distribution of frozen food A is uneven, the lower surface of the second positive plate 113 should be at a certain distance from the upper surface of frozen food A. This is because if the second positive plate 113 is crimped (that is, in contact) with the upper surface of the frozen food A, the second positive plate 113 is only crimped with a part of the upper surface of the frozen food A. Then there will be a difference in the electric energy supplied by the high-frequency electric energy to the frozen food A, which will cause the problem of overheating of the crimped part. In order to prevent this problem from occurring, in the present invention, the lower surface of the second positive electrode plate 113 is separated from the upper surface of the frozen food A by a certain distance beyond the range where the thickness of the frozen food A is uneven.

By changing the distance between the positive plate group and the negative plate 111, the size of the high-frequency heating electric field between the positive plate group and the negative plate 111 is adjusted, thereby changing the thawing temperature. Objects of different sizes can be enlarged between the positive plate group and the negative plate 111 . For example, if the positive electrode plate group moves upward, the distance from the negative electrode plate 111 increases, and larger frozen food can be placed. When the positive electrode plate group moves downward, the distance from the negative electrode plate 111 decreases, allowing smaller frozen foods to be placed. The freezing hardness of frozen food gradually decreases from the inside to the outside, and during the thawing process, the outside of the frozen food is always at room temperature. Conventional high-frequency heating methods often generate too much heat at the edges. Therefore, the usual thawing process is often that the outside has been completely thawed, but the inside has not been completely thawed. This embodiment is to complete the thawing of the entire frozen food inside and outside at the same time.

As shown in Figure 2, the first embodiment uses two positive plates to form a heating capacitor with the negative plate at the same time. The frozen food is placed on the upper surface of the negative plate 111, and the height of the first positive plate 112 is adjusted to adapt to freezing. The height of food A. Then adjust the height of the second positive plate 113 to make it closer to the upper surface of the frozen food. The magnitude of the high-frequency current is directly proportional to the area of the plates and inversely proportional to the spacing between the plates. Since the distances between the two electrode plates and the frozen food A are different, the heating electric fields formed by the two electrode plates and the negative electrode plate 111 are also different. The second positive plate 113 is close to the frozen food A, and its plate surface is small, so it prevents high-frequency electric energy from passing through the angular edge parts of the frozen food A, and only defrosts the inside of the frozen food A, without affecting the angular edge parts. High frequency heating effect. The first positive plate 112 is far away from the frozen food A, so the high-frequency current it generates is small. Since its plate area is large, the first positive plate 112 can apply high-frequency current to the angular edge portion. Have a thawing effect. The first positive plate 112 and the second positive plate 113 apply high-frequency current to the inside of the frozen food at the same time, and the high-frequency current generated by the portion of the first positive plate beyond the second positive plate 113 is mainly applied to the edge portion. Therefore, the high-frequency current applied inside the frozen food A is larger than that applied to the angular edge portion of the frozen food A. By comprehensively matching the distance between the first positive plate 112 and the second positive plate 113 and the negative plate 111, the frozen food A can be The interior and the angular edge portion of frozen food A are defrosted at the same time.

This embodiment uses two positive plates. The second positive plate is closer to the frozen food, has a smaller plate area, and has a larger heating electric field. It is mainly used to heat and defrost the inside of the frozen food. The first positive plate is far away from the frozen food, and its plate area is large, and its heating electric field is small, but it has a thawing effect on the edge of the frozen food. Because the center of frozen food is usually more difficult to thaw, while the edges of frozen food are in contact with the outside room temperature, so the edges are easy to thaw. Therefore, this embodiment uses two positive electrode plates, uses a larger heating electric field for the hard-to-defrost parts in the center, and uses a small heating electric field for the edge parts that are easy to defrost, so that the thawing speed of the entire frozen food tends to be uniform.

In an optional embodiment, in order to reduce the edge effect, at least the surrounding edges of the lowermost positive plate have an upward bending structure, that is, they are bent in a direction away from the negative plate. As shown in FIG. 8 , the edge of the second positive electrode plate 113 is bent upward along the dotted line in the figure, and the bending angle is in the range of 15-25 degrees.

In an optional embodiment, the edge of the negative electrode plate 111 can be bent downward, that is, bent in a direction away from the positive electrode plate, with a bending angle in the range of 15-25 degrees.

In an optional embodiment, the four corners of at least one positive plate have arc transitions to prevent energy from being concentrated on the four corners and preventing the four corners of the frozen food A from being overheated.

In an optional embodiment, the four corners of the negative plate have arc transitions to prevent energy from being concentrated on the four corners and excessive heating of the four corners of frozen food A.

As shown in Figure 1, in an optional embodiment, a control panel (not shown) is provided on the outer surface of the electronic control cabin 12. The control panel uses a control unit and a high-frequency generator to measure the temperature of the thawing cabin. Data is transmitted between sensors through data lines or network cables, and work instructions are input from the control panel. The power of the high-frequency generator can be adjusted on the control panel, and the real-time temperature of the thawing chamber 11 and the temperature time curve can also be observed.

In an optional embodiment, in order to prevent electromagnetic interference, the inner wall of the high-frequency generating cabin 10 is sprayed with conductive paint, and aluminum foil is pasted around the cavity, or metal plates are fixed around the cavity, thereby forming a shielded cavity. , the high-frequency generator is separated from other high-voltage devices, high-current devices and small-current devices are separated, and the cavity shielding method is adopted to effectively control the electromagnetic interference of high-frequency generating devices to measuring devices and control devices, and strengthen control and measurement accuracy.

In an optional embodiment, both the positive plate and the negative plate 111 are made of aluminum. Each positive plate is connected to the anode through a copper or aluminum strip with a certain width, and the negative plate 111 is connected to the box (ie, grounded) through a copper or aluminum strip with a certain width.

In an optional embodiment, as shown in FIG. 2 , the up and down movement of the first positive plate 112 and the second positive plate 113 is driven by a screw drive. The following takes the first positive plate 112 as an example. There are vertical threaded holes at the four corners of the first positive plate 112, and a matching screw 23 passes through each threaded hole. The end of the same side has a sprocket 231 in the same horizontal plane, and a chain 232 is placed on the sprocket 231 of the four screws. Furthermore, the chain 232 is driven by the motor sprocket 231 to drive the four screws 23 to rotate in the same direction at the same time, causing the first positive plate 112 to move up and down, thereby adjusting the distance between the first positive plate 112 and the negative plate 111 . The second positive plate 113 moves through four screws 24, and its moving method is the same as that of the first positive plate 112, and the description is omitted here.

In an optional embodiment, as shown in FIGS. 4 and 5 , a support plate 222 that can slide up and down extends horizontally inside the box 1 , and the support plate 222 is fixedly connected to the first positive plate 112 . The screw rod 220 penetrates the box body 1 upward, threads downward and penetrates the support plate 222 . A knob 221 is provided at the upper end of the screw 220 passing through the box 1, and the rotation of the screw is controlled by the knob 221. A limiting block 216 is provided in the box 1 to limit the upward and downward movement of the screw 220 . The guide rod 212 penetrates the first positive electrode plate 112 from the upper surface of the second positive electrode plate 113 and is used to guide the first positive electrode plate 112 to move up and down. By rotating the knob 221, the up and down movement of the first positive plate 112 can be controlled. The screw rod 211 extends downward from the upper end of the box 1 and penetrates the first positive plate 112 and the second positive plate 113. The second positive plate 113 has no threads and is just put on the screw rod 211 and fixed at the end of the screw rod 211 with a nut 214. . After the frozen food A is placed on the negative plate 111, the screw 220 is rotated, and the first positive plate 112 can move up and down. The height of the second positive plate 113 can be adjusted by tightening the nut 214 .

In an optional embodiment, as shown in FIG. 6 , the first positive plate 112 and the second positive plate 113 can also be connected through folding rods 217 and 218 . The middle parts of the folding lever 217 and the folding lever 218 are connected together through the rotating shaft 219, and the two ends of the folding lever 217 and the folding lever 218 are connected to the first positive electrode plate 112 and the second positive electrode plate 113 respectively. The folding lever 217 and the folding lever 218 rotate around the rotating shaft 219 to adjust the height of the second positive plate.

The height adjustment forms of the positive electrode plates described above are only exemplary. The height of the positive electrode plates can also be adjusted using various adjustment methods such as hanging chains, pneumatic, hydraulic, and electric push rods to adjust the height of each positive plate.

In an optional embodiment, as shown in FIG. 7 , a clamping portion extends below the first positive plate 112 , the clamping portion has a horizontally extending clamping opening, and at the clamping end surface of the clamping opening Balls 215 are also provided on it. The second positive plate 113 can be installed on the clamping part by pressing the balls 215 . As shown in the figure, the clamping opening faces outward. The clamping opening can also face inward, but the shape of the corresponding second positive electrode plate 113 is slightly different. The ball 215 can be replaced by various forms such as a circlip, a spring, a buckle, etc.

In an optional embodiment, the positive plate set may include two or more positive plates, and the positive plate set may include a plurality of positive plates that are parallel to the negative plate and whose surface area decreases sequentially toward the negative plate. That is to say, multiple positive electrode plates can be sequentially clamped on the lower part of the second positive electrode plate 113 to form a multi-layer superimposed heating mode.

In an optional embodiment, as shown in FIG. 3 , the surface dimensions of all positive plates are smaller than the cross-sectional size of frozen food A in the direction of the positive plate surface. As can be seen from FIG. 3 , the size of the first positive plate 112 is smaller than the cross-sectional size of the frozen food A in the direction of the positive plate, and the size of the second positive plate 113 is smaller than the size of the first positive plate 112 .

In an optional embodiment, the length and width of the first positive plate are 3 to 4 cm smaller than the length and width of the frozen food A in the direction of the positive plate, and the length and width of the second positive plate are smaller than the first positive plate. The length and width are 3~4cm smaller.

In an optional embodiment, the lowermost positive plate can be inclined relative to the upper surface of the frozen food A, so that the distance between the lower position of the frozen food surface and the lowermost positive plate is greater than the higher position of the frozen food surface. distance from the lowermost positive electrode plate. Taking the two-layer positive plate as an example, as shown in Figure 9, when the upper surface of frozen food A is irregular and not flat, the distance between the lower surface of the second positive plate and the upper surface of frozen food A is not equal. The distance on the left is smaller than the distance on the right. That is to say, there is a large amount of air between the lower surface of the second positive plate on the right and the upper surface of the frozen food A, which will obviously weaken the heating electric field of the high-frequency current on the frozen food A. This will cause the frozen food A to be heated unevenly, affecting the thawing effect, and it will be difficult for the frozen food A to achieve the effect of thawing at the same time. Therefore, as shown in FIG. 10 , in this embodiment, the second positive plate 113 is tilted to the right at a certain angle to reduce the gap between the lower surface of the second positive plate 113 and the upper surface of the frozen food A. Further, as shown in Figure 11, the second positive plate 113 may also be foldable, that is, the second positive plate 113 is composed of a first folding plate 1131 and a second folding plate 1132. The first folding plate 1131 and the second folding plate 1132 are foldable. The plates 1132 may be connected as a whole through hinges and springs. In the relatively flat area of the upper surface of frozen food A, the first folding plate 1131 remains horizontal. At the position where the upper surface of the frozen food A is inclined and depressed, the second folding plate 1132 is bent downward. The above is just an example. In fact, the bottom positive plate can be multi-folded, that is, it is made up of multiple folding plates, and can be folded according to the upper surface of frozen food A to match the upper surface of frozen food A. .

In an optional embodiment, an insulating pad is laid on the upper surface of the negative plate 111 .

In an optional embodiment, a temperature measurement unit is also provided for measuring the internal and surface temperatures of the frozen food. For example, a temperature measuring optical fiber can be used. The temperature measuring optical fiber is connected to the control unit, and the temperature measurement data can be displayed on a control panel connected to the control unit.

Of course, the negative plate 111 can also have other positional relationships with the positive plate group, as long as adjusting the distance between the positive plate group and the negative plate 111 can change the capacitance of the heating capacitor. For example, the plates of the positive plate set and the negative plate are perpendicular to the horizontal plane. In addition, when adjusting the distance between the positive electrode plate group and the negative electrode plate 111, the positive electrode plate group and the negative electrode plate 111 can also be moved simultaneously.

In an optional embodiment, in the thawing area, the lowermost positive plate is a flexible plate to adapt to the shape of the upper surface of the frozen food so that the entire frozen food is heated evenly.

Second embodiment

As shown in FIG. 12 , the positive plate set of this embodiment has only one positive plate, and the size of the positive plate is smaller than the cross-sectional size of the frozen food along the direction of the positive plate. The positive electrode plate and the negative electrode plate can be in various planar shapes such as rectangular and square, but are preferably rectangular. The anode of the high-frequency generator is connected to the positive plate through, for example, a thin copper sheet. The cathode and negative plate 111 of the high-frequency generator are both grounded, that is, connected to the box 1. The positive plate and the negative plate 111 form a heating capacitor. By applying a predetermined voltage to the anode of the high-frequency generator, a high-frequency wave can be generated between the positive plate and the negative plate 111. The high-frequency wave has a good penetration depth and can allow the frozen food A to be defrosted preferentially from the most difficult-to-defrost position inside. The size of the negative plate may be smaller than the cross-sectional size of the frozen food along the direction of the negative plate, or may be greater than or equal to the cross-sectional size of the frozen food along the direction of the negative plate.

In an optional embodiment, in order to reduce the edge effect, the surrounding edges of the positive electrode plate have an upwardly bent structure, and the bending angle is in the range of 15-25 degrees.

In an optional embodiment, in order to reduce the edge effect, the surrounding edges of the negative plate have a downwardly bent structure, and the bending angle is in the range of 15-25 degrees.

In an optional embodiment, the positive plate may be inclined relative to the upper surface of the frozen food A. Its tilt form is the same as that of the lowermost positive electrode plate in the first embodiment.

In an optional embodiment, the four corners of the positive plate have arc transitions to prevent energy from being concentrated on the four corners and preventing the four corners of frozen food A from being overheated.

In an optional embodiment, the four corners of the negative plate have arc transitions to prevent energy from being concentrated on the four corners and excessive heating of the four corners of frozen food A.

In an optional embodiment, an insulating pad is laid on the upper surface of the negative plate 111 .

In an optional embodiment, both the positive plate and the negative plate 111 are made of aluminum. The positive plate is connected to the anode through a copper strip or aluminum strip with a certain width, and the negative plate 111 is connected to the box (ie, grounded) through a copper strip or aluminum strip of a certain width.

Of course, the negative plate 111 can also have other positional relationships with the positive plate, as long as the distance between the positive plate and the negative plate 111 can be adjusted to change the capacitance of the heating capacitor. For example, the positive and negative plates are perpendicular to the horizontal plane. In addition, when adjusting the distance between the positive electrode plate and the negative electrode plate 111, the positive electrode plate and the negative electrode plate 111 may be moved simultaneously.

Third embodiment

The third embodiment will be described below with reference to FIGS. 11 to 13 . The high-frequency thawing device of this embodiment adds a conveying mechanism 51 to the box 1 and sets multiple rows and columns of thawing areas in the thawing cabin 11 . The conveying mechanism 51 uses a belt to convey frozen food A. The conveying belt 511 runs through the entire box from left to right. The conveying belt 511 penetrates from one side of the box, passes through the thawing compartment 11, and then exits from the other side of the box. The items are defrosted in the thawing cabin 11. Under the conveyor belt 511, driving and transmission components such as a conveyor motor and pulleys for driving the conveyor belt are installed.

As shown in Figures 15 and 16, a plurality of spaced-apart thawing areas are provided in the thawing cabin 11, where each thawing area includes a positive plate group and a negative plate 111 arranged horizontally and up and down, wherein the negative plate 111 can It is a shared larger plate. Similarly, the uppermost positive plate of each positive plate group can also be an integral flat plate 119 . The flat plate 119 and the negative electrode plate 111 have a width that is substantially the same as the width of the conveyor belt 511 and a length that is shorter than the length (front and rear dimensions) of the conveyor belt 511 . In addition, there may be multiple negative electrode plates 111 , and each negative electrode plate 111 corresponds to a positive electrode plate group.

In addition, multiple thawing blocks can also be set, and each thawing block includes multiple thawing areas. The uppermost positive plate of each defrosted block is an integral flat plate 119. Moreover, the thawing blocks are arranged at intervals along the conveying direction.

The positive plate group is located above the negative plate 111. The anode of the high-frequency generator is connected to each positive plate. The cathode and negative plate 111 of the high-frequency generator are both grounded. The positive plate group and the negative plate 111 form a heating capacitor. By applying a predetermined voltage to the anode of the high-frequency generator, high-frequency heat energy can be generated between the positive plate group and the negative plate 111 . The conveyor belt 511 circulates between the lowermost positive plate and the negative plate 111, and the conveyor belt 511 is used to place frozen food. The frozen food A is also arranged at certain intervals, so that when the conveyor belt 511 transports the frozen food A into the thawing chamber 11, each frozen food A can be located just below the corresponding positive electrode plate group. The positive plate group in each thawing area includes a first positive plate 112 and a second positive plate 113 . The height adjustment method of the first positive plate 112 and the second positive plate 113 is the same as that in the first embodiment, and the description thereof is omitted here.

Place all frozen foods on the conveyor belt, and be driven by the conveyor belt 511 to the position corresponding to each defrosting area, and the conveyor belt 511 stops moving. Start high-frequency heating for thawing. When thawing is completed, the conveyor belt 511 drives the frozen food to be output. At the same time, the next batch of frozen food moves to the corresponding thawing area along with the conveyor belt 511.

In an optional embodiment, there may be multiple negative plates, and each negative plate is provided corresponding to a positive plate group.

In an optional embodiment, the size of each positive plate is smaller than the cross-sectional size of the frozen food along the direction of the positive plate, and the size of each negative plate 111 is smaller than the size of the frozen food along the direction of the negative plate. cross-sectional dimensions.

Of course, the above is only a preferred solution. The present invention does not exclude other positional relationships between the negative plate 111 and the positive plate. As long as the distance between the positive plate and the negative plate 111 is adjusted, the capacitance of the heating capacitor can be changed. Can. For example, the positive plate 111 is located below the conveyor belt 511 and the negative plate 111 is located above the conveyor belt 511 . Alternatively, the positive and negative plates are perpendicular to the horizontal plane. In addition, when adjusting the distance between the positive electrode plate and the negative electrode plate 111, the positive electrode plate and the negative electrode plate 111 may be moved simultaneously.

The technical solutions of each thawing area in the third embodiment are the same as those in the first embodiment, and other identical descriptions are omitted here.

The present invention also provides a high-frequency thawing method, which uses the high-frequency thawing device described in the first embodiment to perform the following steps:

Adjust the distance between the positive plate set and the negative plate so that the distance between the bottom positive plate and the negative plate is suitable for the size of the frozen food.

Place the frozen food between the bottom positive and negative plates.

Adjust the lowermost positive plate according to the shape of the upper surface of the frozen food, so that the distance between the lower position of the frozen food surface and the lowermost positive plate is greater than the distance between the higher position of the frozen food surface and the lowermost positive plate. distance.

Start the high-frequency generator to generate a high-frequency electric field between the positive plate and the negative plate for thawing. Wherein, the plate size of each positive plate is smaller than the cross-sectional size of the frozen food along the direction of the positive plate, and the plate size of the negative plate is smaller than the cross-sectional size of the frozen food along the direction of the negative plate.

According to the temperature rise inside and around the edge of the frozen food, adjust the distance between the bottom plate and the negative plate to defrost the frozen food evenly.

In an optional embodiment, if the edge of the frozen food heats up faster than the inside, reduce the distance between the bottom plate and the frozen food; if the edge of the frozen food heats up slower than the inside, then increase the distance between the bottom plate and the frozen food. The distance between the plate and frozen food.

In an optional embodiment, during the thawing process, the frozen food can be thawed by continuous heating or intermittent heating, where intermittent heating means heating for a period of time and stopping for a period of time. For example, every 3 to 5 minutes of heating, stop for 2 to 3 minutes to allow heat to be conducted evenly inside the frozen food, which will help the entire frozen food to defrost evenly.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (8)

1. A high-frequency thawing device, characterized by comprising: A thawing cabin. The thawing cabin includes a shell and a thawing area arranged in the shell. The thawing area includes a positive electrode plate group and a negative electrode plate that are parallel and aligned with each other, wherein the positive plate group includes two or more positive electrodes. plates, and the positive plates are spaced apart in a manner that the plate surface decreases in the direction toward the negative plates; A high-frequency generator, the anode of which is connected to each positive plate of the positive plate group, the cathode and the negative plate of the high-frequency generator are both grounded, and high-frequency electric energy is applied to the positive plate group and the negative plate through the high-frequency generator to cause freezing effects Food is defrosted, Among them, the distance between each positive plate and the negative plate can be adjusted. The size of the positive plate is smaller than the cross-sectional size of the frozen food along the direction of the positive plate; Wherein, in the thawing area, the lowermost positive plate can be inclined relative to the upper surface of the frozen food, and the distance between the lower position of the frozen food surface and the lowermost positive plate is greater than the distance between the higher position of the frozen food surface and the lowermost positive plate. The distance between the lower positive plates. 2. The high-frequency thawing device according to claim 1, wherein a plurality of thawing areas form a thawing block, and the uppermost positive plate of all positive plate groups in each thawing block is formed into an integral flat plate. 3. The high-frequency thawing device according to claim 1, wherein in the thawing area, at least the edge of the lowermost positive plate is bent in a direction away from the negative plate; The edge of the negative electrode plate is bent in a direction away from the positive electrode plate; Four corners of the negative plate and at least one positive plate have arc transitions. 4. The high-frequency thawing device according to claim 1, wherein in the thawing area, the lowermost positive plate is a flexible plate to adapt to the shape of the upper surface of the frozen food so that the entire frozen food is evenly heated. 5. The high-frequency thawing device according to claim 2, wherein, A conveying mechanism is also provided, and a plurality of frozen foods are conveyed by the conveying mechanism to the thawing area of the corresponding thawing block in the thawing cabin, and are output by the conveying mechanism after thawing is completed. 6. A high-frequency thawing method, characterized in that the following steps are performed using the high-frequency thawing device according to claim 1: Adjust the distance between the positive plate set and the negative plate so that the distance between the bottom positive plate and the negative plate is suitable for the size of the frozen food; Place the frozen food between the bottom positive and negative plates; Adjust the lowermost positive plate according to the shape of the upper surface of the frozen food, so that the distance between the lower position of the frozen food surface and the lowermost positive plate is greater than the distance between the higher position of the frozen food surface and the lowermost positive plate. distance; Start the high-frequency generator to generate a high-frequency electric field between the positive plate group and the negative plate to perform thawing, wherein the size of each positive plate is smaller than the cross-sectional size of the frozen food along the direction of the positive plate; According to the temperature rise inside and around the edge of the frozen food, adjust the distance between the bottom positive plate and the negative plate to defrost the frozen food evenly. 7. The high-frequency thawing method according to claim 6, wherein, If the edge of the frozen food heats up faster than the inside, adjust the bottom positive plate to reduce the distance between the bottom positive plate and the frozen food; If the edge of the frozen food heats up slower than the inside, adjust the bottom positive plate to increase the distance between the bottom positive plate and the frozen food. 8. The high-frequency thawing method according to claim 6, wherein, During the thawing process, continuous heating or intermittent heating is used to defrost frozen food. Wherein, the intermittent heating refers to stopping the heating for a certain period of time so that the heat can be evenly conducted inside the frozen food.