WO2019218003A1

WO2019218003A1 - Rfid rf freezer

Info

Publication number: WO2019218003A1
Application number: PCT/AU2019/050450
Authority: WO
Inventors: Xiao Wu; Runsheng LIU; Huaiguo LIU; Yucheng FAN
Original assignee: Quatius Aust Pty Ltd
Priority date: 2018-05-14
Filing date: 2019-05-14
Publication date: 2019-11-21
Also published as: AU2019268405A1

Abstract

The present invention relates to RFID RF freezers, comprising: a cabinet, a cabinet door and an RFID antenna. The cabinet door retractably closes an opening of the cabinet. The cabinet comprises a shielded outer casing connected to a combined inner casing; the combined inner casing comprises a first inner casing and a second inner casing connected to each other. The RFID antenna is disposed in a space between the second inner casing and the shielded outer casing, so that the RFID antenna will not affect the removal and placement of goods. In addition, the second inner casing is an inner casing that does not attenuate RF signals, and will not affect the signal transmission between the RFID antenna and the RFID electronic tag on goods inside the cabinet.

Description

RFID RF Freezer

Field of the Invention The present invention relates to a freezer, and more particularly, an RFID RF freezer or a freezer based on RFID technology.

Background of the Invention Outer and inner casings of traditional RFID (Radio Frequency Identification) freezers are both made of metal. As the metal casings will shield RF signals, in order for the RFID antenna to sense an RFID electronic tag attached to goods inside an RFID RF freezer, a common practice is to mount the RFID antenna on an inner side wall of the RFID RF freezer. However, in this practice, the RFID antenna will occupy a certain volume in the freezer, which is not conducive to the taking and placement of goods, and the goods can contact with and thus damage the RFID antenna.

Furthermore, when a RFID antenna is disposed on the inner wall of a freezer based on RFID technology, cold air will be in contact with the antenna body and the antenna element of the RFID antenna, resulting in a certain deformation of the antenna element due to a fall of temperature, and a change in the antenna performance, thus affecting the recognition effect of the RFID antenna. Also, the direct contact of the outer surface of the antenna and the outer casing of the freezer with the cold air in the cabinet can cause frost and water on the outer surface of the RFID antenna, connector wire, and other elements which the antenna casing may be in contact with, due to the relatively low outer surface temperature of the antenna and the cabinet. This can finally lead to the oxidation and decomposition damage of elements of the RFID antenna. Summary of the Invention

To overcome the above issues with the prior art, it is necessary to provide a type of RFID RF freezer which does not interfere with the taking and placement of goods and can avoid damage to the RFID antenna caused by the goods.

According to a first aspect of the present invention, there is provided an RFID RF freezer, comprising: a cabinet and a cabinet door; the cabinet door retractably covering an opening of the cabinet; the cabinet comprising a shielded outer casing and a combined inner casing; the combined inner casing being connected with the shielded outer casing, and correspondingly disposed in the shielded outer casing; the combined inner casing comprising a first inner casing and a second inner casing connected to each other; the first inner casing is a shielded inner casing, and the second inner casing is an inner casing that does not attenuate RF signals; and, an RFID antenna disposed in a space between the second inner casing and the shielded outer casing.

The above RFID RF freezer disposes the RFID antenna in a space between the second inner casing and the shielded outer casing, so that the RFID antenna will not affect the removal or placement of goods, and thus can avoid damage to the RFID antenna caused by contact with the goods. In addition, the second inner casing is an inner casing that does not attenuate RF signals, and will not affect the signal transmission between the RFID antenna and the RFID electronic tag attached to goods inside the cabinet so that the RFID antenna can function optimally. The shielded outer casing and the first inner casing can avoid external RF signal interference to the RFID antenna, impact on human health due to leakage of the RF signal of the RFID antenna to the outside of the cabinet, and electromagnetic pollution or electromagnetic interference to the external environment and electrics of the freezer.

Preferably, the first inner casing is located on four side walls of the combined inner casing, and the second inner casing is located at the bottom wall of the combined inner casing, and the cabinet door is located at the top of the cabinet. Preferably, the RFID RF freezer further comprises more than one condenser tube; the first inner casing is a cool-conduction shielded inner casing; the condenser tube is circumferentially disposed around the first inner casing.

Preferably, the shielded outer casing and the first inner casing are metal casings, and the second inner casing is a plastic casing.

Preferably, there are thermal insulation materials filled between the combined inner casing and the outer casing. Preferably, the thermal insulation materials are polyurethane foams.

Preferably, the cabinet door includes a shielded glass material. The cabinet door can include a tempered glass material with a metal film layer or a metal oxide film layer on the surface, or the cabinet door includes a laminated glass material with a wire mesh interposed therebetween.

Preferably, there is more than one plastic frame for goods inside the cabinet. To overcome other issues with in the prior art, it is necessary to provide a type of freezer based on RFID technology, which can avoid affecting the recognition effect of the RFID antenna and causing damage to the RFID antenna due to frost and water, and maintain the original thermal insulation effect of the freezer. According to another aspect of the invention, there is provided: a freezer based on RFID technology, comprising: a cabinet and a cabinet door; the cabinet door retractably closing an opening of the cabinet; the cabinet comprises an outer casing and an inner casing; the inner casing being connected with the outer casing, and correspondingly disposed in the outer casing; an RFID antenna disposed in a space between the inner casing and the outer casing; the inner casing and a side wall corresponding to the RFID antenna are casings made of materials which do not attenuate the radio frequency (RF) signals; and thermal insulation materials filled between the inner casing and the outer casing; the thickness (d) of the thermal insulation materials filled between the RFID antenna and the inner casing is at least 50mm.

By disposing the RFID antenna in a space between the inner casing and the outer casing and filling thermal insulation materials between the RFID antenna and the inner casing, the thickness (d) of which is at least 50mm and which thus have a good thermal insulation effect on the RFID antenna, the above freezer can prevent the RFID antenna from damage due to frost and water. Meanwhile, the cold air in the cabinet can avoid contact with the antenna body and the antenna element of the RFID antenna, which can result in deformation of the antenna element due to the fall of temperature, and which may affect the performance of the antenna. Such an arrangement thus is capable of ensuring the recognition effect of the RFID antenna. Also, the RFID antenna may not affect the taking and placement of goods, and can avoid any damage to the RFID antenna caused by the goods and provide protection to the RFID antenna. In addition, the inner wall corresponding to the RFID antenna is a casing that does not attenuate RF signals, and RF signals can pass through this casing normally, and will not affect the signal transmission between the RFID antenna and the RFID electronic tag on goods inside the cabinet, and the RFID antenna can function properly.

Preferably, the thermal insulation materials are polyurethane foams.

Preferably, the inner casing comprises a first inner casing and a second inner casing connected to each other; the first inner casing is a shielded inner casing, and the second inner casing is an inner casing that does not attenuate RF signals; the second inner casing and the RFID antenna are correspondingly disposed. Preferably, the first inner casing is located on four side walls of the inner casing, and the second inner casing is located at the bottom wall of the inner casing, and the cabinet door is located at the top of the cabinet. Preferably, the freezer further comprises more than one condenser tube; the first inner casing is a cool-conduction shielded inner casing; the condenser tube is circumferentially disposed around the first inner casing. Preferably, the outer casing and the first inner casing are metal casings, and the second inner casing is a plastic casing.

Preferably, the second inner casing is an ABS plastic casing. Preferably, the cabinet door includes a shielded glass material and there is more than one plastic frame for goods inside the cabinet. The cabinet door can include a tempered glass material with a metal film layer or a metal oxide film layer on the surface. The cabinet door can also include a laminated glass material with a wire mesh interposed therebetween.

Brief Description of the Drawings

FIG 1 is a structural schematic diagram of an RFID RF freezer/ freezer based on RFID technology of one embodiment of the present invention;

FIG 2 is a side sectional view of the freezer of one embodiment of the present invention;

FIG 3 is a top schematic view of the freezer of one embodiment of the present invention;

FIG 4 is a schematic diagram of the internal structure of the freezer of one embodiment of the present invention; FIG 5 is a side sectional view of the freezer with goods placed inside in one embodiment of the present invention.

List of Reference Numbers: 100, 200 Freezer; 110, 210 Cabinet; 11 1 , 211 Shielded outer casing; 1 12, 212 Combined inner casing; 1 121 , 2121 First inner casing; 1122, 2122 Second inner casing; 120, 220 Cabinet door; 130, 230 RFID antenna; 140, 240 Condenser tube; 150, 250 Thermal insulation materials; 160, 260 Plastic frame for goods; 170, 270 Load-bearing layer; 180 Goods; 190 RFID electronic tag.

Detailed Description of the Preferred Embodiments

The present invention is further described in detail below with reference to the accompanying drawings and embodiments in order to better clarify the objects, characteristics and advantages of the present invention. In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention. However, the present invention may be implemented in many different forms other than those herein described or illustrated. Those skilled in the art may make similar improvements without departing from the concept of the present invention. Therefore, the present invention is not limited by the embodiments disclosed below.

In the description of the present invention, it is to be understood that the terms “first” and“second” are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining first or second may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of “a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.

In the description of the present invention, it is to be understood that when an element is considered “connected” to another element, it can be directly connected, or indirectly connected through an intermediate element, to another element. In contrast, when an element is illustrated as“directly” connected to another element, there is no intermediate element. ln one embodiment, please refer to FIG 1 and FIG 2, an RFID RF freezer 100 comprises a cabinet 1 10, a cabinet door 120 and an RFID antenna 130. The cabinet door 120 is retractably disposed at a window or opening of the cabinet 1 10 to cover the opening. The cabinet 1 10 comprises a shielded outer casing 1 11 and a combined inner casing 1 12. The combined inner casing 112 connects with the shielded outer casing 11 1 , and is correspondingly disposed in the shielded outer casing 1 11. The combined inner casing 112 comprises a first inner casing 1 121 and a second inner casing 1 122 connected to each other. The first inner casing 1121 is a shielded inner casing, and the second inner casing 1 122 is an inner casing that does not attenuate RF signals. The RFID antenna 130 is disposed in a space between the second inner casing 1 122 and the shielded outer casing 11 1.

The above RFID RF freezer 100 disposes the RFID antenna 130 in a space between the second inner casing 1122 and the shielded outer casing 1 11 , so that the RFID antenna 130 will not affect removal and placement of goods 180, and therefore can avoid any damage to the RFID antenna 130 caused by the goods 180. In addition, the second inner casing 1 122 is an inner casing that does not attenuate RF signals, may have a plastic casing, and therefore will not affect the signal transmission between the RFID antenna 130 and the RFID electronic tag 190 on goods 180 inside the cabinet 1 10 so that the RFID antenna 130 can function properly. The shielded outer casing 11 1 and the first inner casing 1 121 can avoid external RF signal interference to the RFID antenna 130, impact on human health due to leakage of the RF signals of the RFID antenna 130 to the outside of the cabinet 1 10, and reduce electromagnetic pollution or electromagnetic interference to the external environment and electrics of the freezer 100.

Further, the first inner casing 1 121 is located on four side walls of the combined inner casing 1 12, and the second inner casing 1122 is located at the bottom wall of the combined inner casing 112, and the cabinet door 120 is located at the top of the cabinet 1 10. In this way, the above RFID RF freezer 100 is a chest freezer 100 with an upward window, and the condenser tube 140 is correspondingly disposed on the four side walls of the cabinet 1 10, and the RFID antenna 130 is correspondingly disposed at the bottom of the cabinet 110. Also, for an RFID RF freezer 100 with a cabinet door 120 not at the top of the cabinet 110, that is, the cabinet 1 10 opens at the side of the cabinet 1 10, the second inner casing 1122 is not limited to being located at the bottom of the cabinet 1 10, and may be disposed on a side of the cabinet 1 10 opposite to the window. As such, the RFID antenna 130 is not limited to being disposed at the bottom of the cabinet 110, so that the RFID antenna 130 can have a better radiation effect, and the transmission of RF signals between the RFID antenna 130 and the RFID electronic tag 190 is improved. It can be understood that, in order to increase the radiation range of the RFID antenna 130, two or more RFID antennas 130 may be disposed.

Further, with reference to FIG 4, the RFID RF freezer 100 further comprises more than one condenser tube 140. The first inner casing 1 121 is a cool- conduction shielded inner casing, and specifically, may be made of metal. The condenser tube 140 is circumferentially disposed around the first inner casing 1 121. In this way, the condenser tube 140 contacts the first inner casing 1 121 and passes the cooling capacity to the first inner casing 1121 , so as to lower the temperature of the first inner casing 1121. As the first inner casing 1121 is made of cool-conduction shielded materials, the condenser tube 140 can rapidly pass the heat to the first inner casing 1 121 , so as to maintain the cabinet in a low- temperature environment. Besides, the cabinet 1 10 refrigeration can also be realized by internal fan rotation to circulate cold air inside the cabinet 110.

Further, the shielded outer casing 1 1 1 and the first inner casing 1 121 have metal casings, and the second inner casing 1122 is a plastic casing. In this way, the shielded outer casing 1 11 and the first inner casing 1 121 can have a good shielding effect for RF signals, and the plastic casing can allow RF signals to pass through without affecting the RF signals. Specifically, the second inner casing 1122 can use ABS plastic casing. With such a configuration, the cold air can be in contact with the antenna body and the antenna element of the RFID antenna 130, resulting in a certain deformation of the antenna element due to the fall of temperature, a change in the antenna performance, and in inconsistency of the RF performance due to change in the temperature environment of the antennas at different locations, thus affecting the recognition effect of the RFID antenna 130.

Similarly, as the antenna body is eroded by the cold air in the freezer 100, the outer surface of the antenna and the outer casing of the freezer 100 may directly contact with the air, and the humidity in the air will turn into frost and water on the outer surface of the antenna, connector wire, and other elements which the antenna casing may be in contact with, due to the relatively low outer surface temperature of the antenna and the freezer 100. This will finally lead to the oxidation and decomposition damage of the body of, and elements in contact with, the antenna.

With reference to FIGs 2, 3 and 5, thermal insulation materials 150 are filled between the combined inner casing 112 and the outer casing. Specifically, the thermal insulation materials 150 are polyurethane foams. In this way, the thermal insulation materials 150 can prevent cold air from contacting with the RFID antenna 130 to cause damage to the RFID antenna 130, and avoid the passing of heat in the cabinet 110 to the environment outside the cabinet 110, so that the cabinet 110 has a good thermal insulation effect. Further, the thickness (d) of the thermal insulation materials 150 filled between the RFID antenna 130 and the second inner casing 1122 is at least 50mm. As such, the thermal insulation materials 150 will have a good thermal insulation effect on the RFID antenna 130, and can avoid the RFID antenna 130 from frosting, and provide protection for the RFID antenna 130. Also, the RFID antenna 130 is parallel with the second inner casing 1122, or according to the RFID recognition needs, an angle can be formed between the RFID antenna 130 and the second inner casing 1122. Another embodiment of the invention can be described with reference to Figures 1 to 5. In this embodiment a freezer based on RFID Technology 200 comprises a cabinet 210, a cabinet door 220, an RFID antenna 230 and thermal insulation materials 250. The cabinet door 220 retractably covers an opening or window of the cabinet 210. The cabinet 210 comprises an outer casing 21 1 and an inner casing 212. The inner casing 212 connects with the outer casing 211 , and is correspondingly disposed in the outer casing 211. The RFID antenna 230 is disposed in a space between the inner casing 212 and the outer casing 211. The inner casing 212 and the side wall corresponding to the RFID antenna 230 are casings made of materials which do not attenuate the RF signals. Thermal insulation materials 250 are filled between the inner casing 212 and the outer casing 211 ; the thickness (d) of the thermal insulation materials 250 filled between the RFID antenna 230 and the inner casing 212 is at least 50mm. Specifically, the thermal insulation materials 250 are polyurethane foams.

By disposing the RFID antenna 230 in a space between the inner casing 212 and the outer casing 21 1 and filling thermal insulation materials 250 between the RFID antenna 230 and the inner casing 212, the thickness (d) of which is at least 50mm and would thus have a good thermal insulation effect on the RFID antenna 230, the above freezer 200 based on RFID technology can prevent the RFID antenna 230 from damage due to frost and water. Meanwhile, cold air in the cabinet 210 will not be in contact with the antenna body and the antenna element of the RFID antenna 230, avoiding deformation of the antenna element due to the fall of temperature, and reducing the performance of the antenna, which is thus capable of ensuring the recognition effect of the RFID antenna 230. Also, the RFID antenna 230 will not affect removal and placement of goods 180, and can avoid damage to the RFID antenna 230 caused by the goods 180 and provide protection to the RFID antenna 230. In addition, the side wall corresponding to the RFID antenna 230 is a casing that does not attenuate RF signals, and RF signals can pass through such casing normally, without interfering with the signal transmission between the RFID antenna 230 and the RFID electronic tag 190 on goods inside the cabinet 210, and the RFID antenna 230 can function properly. Furthermore, the inner casing 212 comprises a first inner casing 2121 and a second inner casing 2122 connected to each other. The first inner casing 2121 is a shielded inner casing 212 and the second inner casing 2122 is a casing that does not attenuate RF signals. The second inner casing 2122 and the RFID antenna 230 are correspondingly disposed. In this way, the first inner casing 2121 can avoid external RF signal interference to the RFID antenna 230, impact on human health due to leakage of the RF signals of the RFID antenna 230 to the outside of the cabinet 210, and electromagnetic pollution or electromagnetic interference to the external environment and electrics of the freezer 200. The second inner casing 2122 is an inner casing that does not attenuate RF signals, so as to not affect the signal transmission between the RFID antenna 230 and the RFID electronic tag 190 on goods 180 inside the cabinet 210, and the RFID antenna 230 can function properly.

In one embodiment, the first inner casing 2121 is located on four side walls of the inner casing 212, and the second inner casing 2122 is located at the bottom wall of the inner casing 212, and the cabinet door 220 is located at the top of the cabinet 210. In this way, the above freezer 200 based on RFID technology is a chest freezer 200 with an upward window, and the condenser tube 240 is disposed around the four side walls of the cabinet 210, and the RFID antenna 230 is disposed at the bottom of the cabinet 210. Also, for a freezer 200 based on RFID technology with a cabinet door 220 not at the top of the cabinet 210, that is, the window of the cabinet 210 opens at the side of the cabinet 210, the second inner casing 2122 can be located at the bottom of the cabinet 210, and may be disposed on a side of the cabinet 210 opposite to the window. As such, the RFID antenna 230 is not limited to being disposed at the bottom of the cabinet 210, so that the RFID antenna 230 can have a better radiation effect, and the transmission of RF signals between the RFID antenna 230 and the RFID electronic tag 210 is improved. It can be understood that, in order to increase the radiation range of the RFID antenna 230, two or more RFID antennas 230 may be disposed. With reference to FIG 4, the freezer 200 based on RFID technology can further comprise more than one condenser tube 240. The first inner casing 2121 is a cool-conduction shielded inner casing 212 and the condenser tube 240 is circumferentially disposed around the first inner casing 2121. In this way, the condenser tube 240 contacts the first inner casing 2121 and passes the cooling capacity to the first inner casing 2121 , so as to lower the temperature of the first inner casing 2121. As the first inner casing 2121 is made of cool-conduction shielded materials and may be a metal casing, the condenser tube 240 can rapidly pass the heat to the first inner casing 2121 , so as to maintain the cabinet 210 in a low-temperature environment. Also, refrigeration of the cabinet 210 can also be realized by internal fan rotation to circulate cold air inside the cabinet 210.

Preferably, the outer casing 211 and the first inner casing 2121 are metal casings, and the second inner casing 2122 is a plastic casing. In this way, the outer casing 21 1 and the first inner casing 2121 can have a good shielding effect for RF signals, and the plastic casing can allow the RF signals to pass through without affecting the RF signals. Preferably, the second inner casing 2122 can use ABS plastic casing.

In one embodiment, the cabinet door 120, 210 is formed with a shielded glass material. Specifically, the cabinet door 120, 210 is formed of a tempered glass material with a metal film layer or a metal oxide film layer on the surface, or the cabinet door 120, 220 includes a laminated glass material with a wire mesh interposed therebetween. In this way, the cabinet door 120, 220 can shield the

RF signals transmitted from the RFID antenna 130, 230, avoid the leakage of RF signals transmitted from the RFID antenna 130, 230, weaken and attenuate the external electromagnetic signals, avoid any external electromagnetic signal from passing through the shielded glass, and prevent external RF signals from disturbing the RFID RF signals inside the cabinet 1 10, 210. Also, the silver- plated tempered glass may prevent the mutual exchange and passing of temperature between the inner surface of the cabinet 110, 210 and the exterior of the cabinet 1 10, 210 to some extent, which has a good thermal insulation effect.

With reference to FIG 5, there is more than one plastic frame for goods 160, 260 inside the cabinet 1 10, 210. Specifically, the plastic frame for goods 160, 260 may be a plurality of independent ones, or an integral component customized by a plastic material or a large grid wire mesh inside the cabinet 1 10, 210, and is installed in the cabinet 110, 210 to isolate different goods. The plastic frame for goods 160, 260 is not made of shielding materials, and are used for building an ideal RF environment inside the cabinet 1 10, 210 and the plastic frame for goods 160, 260 will not disturb the transmission of signals between the RFID antenna 130, 230 and the RFID electronic tag 190 attached to the goods 180. In addition, in order to facilitate the placement and separation of the goods 180, a load-bearing layer 170, 270 can be arranged between the plastic frames of the goods 160, 260. The load-bearing layer 170, 270 should correspondingly use non-shielding materials or materials which will not largely affect the recognition effect of the RFID electronic tag at the upper layer, for example, ABS plastics, large grid wire mesh. In this way, it will not disturb the transmission of signals between the RFID antenna 130, 230 and the RFID electronic tag 190 attached to the goods 180. In practical application, it can be a customized integral mesh component that constitutes a classification layer for goods. As such, the plastic frame can also be an optional element.

In preferred embodiments, there is a sensor mounted inside the cabinet 1 10, 210 for sensing the opening and closing state of the cabinet door 120, 220. The sensor is electrically connected to the RFID antenna 130, 230. When the sensor senses that the cabinet door 120, 220 is open, it correspondingly controls the RFID antenna 130, 230 to power off; when the sensor senses that the cabinet door 120, 220 is closed, it correspondingly controls the RFID antenna 130, 230 to turn on. In this way, when the cabinet door 120, 220 is open, the RFID antenna 130, 230 powers off and stops working, which can avoid the disturbance to the RFID antenna 130, 230 after an external RF signal enters into the cabinet 1 10, 210 through the window of the cabinet 110, 210. Meanwhile, the closing state of the RFID antenna 130, 230 can avoid the RFID signal from leaking outside the freezer through the window of the cabinet 1 10, 210. When the sensor senses that the cabinet door 120, 220 is closed, it correspondingly controls the RFID antenna 130, 230 to turn on, and the RFID antenna 130, 230 then powers on and continues to work normally.

The technical features of the embodiments described above may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of the technical features are not contradictory, the combinations should be considered as falling within the scope of the specification.

The above embodiments merely express several implementations of the present invention, and the descriptions are relatively specific and detailed, but cannot be thus understood as limitations to the patent scope of the present invention. It should be indicated that those of ordinary skill in the art may also make several transformations and improvements without departing from the concept of the present invention, and the transformations and improvements all belong to the protection scope of the present invention. Therefore, the patent protection scope of the present invention should be based on the appended claims.

Claims

1. An RFID freezer, comprising:

a cabinet and a cabinet door; the cabinet door retractably covering an opening of the cabinet; the cabinet comprising a shielded outer casing and a combined inner casing; the combined inner casing being connected with the shielded outer casing, and correspondingly disposed in the shielded outer casing; the combined inner casing comprising a first inner casing and a second inner casing connected to each other; the first inner casing is a shielded inner casing, and the second inner casing is an inner casing that does not attenuate radio frequency (RF) signals; and

an RFID antenna disposed in a space between the second inner casing and the shielded outer casing.

2. The RFID RF freezer of claim 1 , further comprising thermal insulation materials filled between the combined inner casing and the outer casing.

3. The RFID RF freezer as claimed in claim 1 or claim 2, wherein the cabinet door includes a shielded glass material.

4. The RFID RF freezer of claim 3, wherein the cabinet door includes a tempered glass material with a metal film layer or a metal oxide film layer on the surface, or the cabinet door includes a laminated glass material with a wire mesh interposed therebetween.

5. The RFID RF freezer as claimed in any one of claims 1 to 4, wherein there is more than one plastic frame for goods inside the cabinet.

6. A freezer based on RFID technology, comprising:

a cabinet and a cabinet door; the cabinet door retractably covering an opening of the cabinet; the cabinet comprising an outer casing and an inner casing; the inner casing being connected with the outer casing, and correspondingly disposed in the outer casing;

an RFID antenna disposed in a space between the inner casing and the outer casing; the inner casing and a side wall corresponding to the RFID antenna are casings made of materials which do not attenuate the radio frequency (RF) signals; and

thermal insulation materials filled between the inner casing and the outer casing; the thickness (d) of the thermal insulation materials between the RFID antenna and the inner casing is at least 50mm.

7. The freezer of claim 2 or claim 6, wherein the thermal insulation materials are polyurethane foams.

8. The freezer of claim 6, wherein the inner casing comprises a first inner casing and a second inner casing connected to each other; the first inner casing is a shielded inner casing, and the second inner casing is an inner casing that does not attenuate RF signals; the second inner casing and the RFID antenna are correspondingly disposed.

9. The freezer of claim 1 or claim 8, wherein the first inner casing is located on four side walls of the inner casing, and the second inner casing is located at a bottom wall of the inner casing, and the cabinet door is located at the top of the cabinet.

10. The freezer of claim 9, further comprising more than one condenser tube; the first inner casing is a cool-conduction shielded inner casing; and the condenser tube is circumferentially disposed around the first inner casing.

1 1. The freezer of claim 1 or claim 8, wherein the outer casing and the first inner casing are metal casings, and the second inner casing is a plastic casing.

12. The freezer as claimed in any one of claims 6 to 1 1 , wherein the cabinet door includes a shielded glass material and there is more than one plastic frame for goods inside the cabinet.

13. The freezer of claim 12, wherein the cabinet door includes a tempered glass material with a metal film layer or a metal oxide film layer on the surface.

14. The freezer of claim 13, wherein the cabinet door includes a laminated glass material with a wire mesh interposed therebetween.