RFID electronic tag packaging structure

Abstract

The utility model discloses a kind of RFID electronic tag packaging structures, including the metal shell with opening structure formed in upper end, the PEEK filling inner core fixed filled in metal shell, PEEK pressing plate and sealing gasket, the chip containing cavity and antenna containing cavity for the chip and antenna stop containing of RFID electronic tag are formed in PEEK filling inner core, sealing gasket covers on PEEK filling inner core upside, PEEK pressing plate is fixedly installed in the inside of metal shell opening end, PEEK pressing plate is tightly pressed on the upside surface of sealing gasket, so that sealing gasket and metal shell inner wall and PEEK filling inner core upside surface sealing contact, signal is communicated with the antenna of RFID electronic tag through the opening structure of metal shell, the packaging structure of the utility model can fully protect RFID electronic tag in high temperature environment, so that its chip and antenna can be long-term in high temperature and high pressure working condition use.

Description

Technical Field

[0001] This utility model relates to the field of RFID packaging technology with ultra-long detection range, and in particular to an RFID electronic tag packaging structure. Background Technology

[0002] The oil and gas mining industry relies on RFID technology to ensure mining safety, improve operational efficiency, extend equipment asset lifecycles, and reduce non-productive downtime. RFID provides a complete intelligent management solution for basic management in oil and gas mining. The installation method for electronic tags in the oil and gas mining industry is as follows: first, a hole is drilled in the drill pipe or well casing; the inner diameter of the hole needs to be 0.1-0.3mm smaller than the outer diameter of the encapsulated electronic tag. Then, a hydraulic press is used to press the electronic tag into place.

[0003] Traditional RFID tag encapsulation mostly uses ceramics, ordinary plastics, or epoxy resin. In wells thousands of meters deep, temperatures can reach 200°C, and external liquid pressures can reach 150 MPa. Even a slight liquid leak can affect the performance of the internal electronic components of the tag, causing it to malfunction. Traditional encapsulation solutions cannot meet the sealing requirements of the harsh underground conditions. Using all-metal encapsulation would shield the tag's signal, preventing signal transmission. Utility Model Content

[0004] To overcome the above-mentioned defects, this utility model provides an RFID electronic tag packaging structure and packaging method. The RFID electronic tag packaging structure formed by this RFID electronic tag packaging method has the characteristics of high temperature resistance, high pressure resistance and corrosion resistance, and can meet the needs of use in harsh environments.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: an RFID electronic tag packaging structure, including a metal shell, a PEEK filled inner core, a PEEK pressure plate, and a sealing gasket. The upper end of the metal shell has an opening structure. The PEEK filled inner core is fixedly filled inside the metal shell. The PEEK filled inner core has a chip receiving cavity and an antenna receiving cavity for the chip and antenna of the RFID electronic tag to be accommodated. The sealing gasket covers the upper side of the PEEK filled inner core. The PEEK pressure plate is fixedly installed inside the opening end of the metal shell. The PEEK pressure plate is pressed tightly against the upper surface of the sealing gasket so that the sealing gasket is in sealed contact with the inner side wall of the metal shell and the upper surface of the PEEK filled inner core. The signal can communicate with the antenna of the RFID electronic tag through the opening structure of the metal shell and through the PEEK pressure plate and the sealing gasket.

[0006] As a further improvement of this utility model, the metal outer shell includes a lower metal shell, a upper metal shell, and a metal pressure ring. The lower metal shell is a barrel structure with an open top. The upper metal cover can be fixedly connected to the upper surface of the PEEK filling core to form an integral structure. The upper metal cover covers the chip and antenna of the RFID electronic tag. The outer diameter of the upper metal shell is smaller than the inner diameter of the upper opening of the lower metal shell. The sealing gasket is sleeved on the outside of the upper metal shell. The sealing gasket completely covers the annular upper surface of the PEEK filling core located between the lower and upper metal shells. The PEEK pressure plate is tightly sleeved on the outside of the upper metal shell and presses the upper side of the sealing gasket. The metal pressure ring can be fixedly installed on the lower metal shell and presses the upper end of the PEEK pressure plate.

[0007] As a further improvement of this utility model, a radially convex flange is formed on the outer circumferential wall of the lower end of the metal upper shell, and the sealing gasket covers the upper end face of the flange on the outer side of the metal upper shell and the upper end face of the side wall of the metal lower shell, and the lower end of the PEEK pressure plate completely covers the upper surface of the sealing gasket.

[0008] As a further improvement of this utility model, a radially convex step is formed on the outer circumference of the PEEK pressure plate, and a radially concave retaining ring is formed on the inner sidewall of the upper end of the metal pressure ring, with the retaining ring of the metal pressure ring tightly abutting against the radially convex step of the PEEK pressure plate.

[0009] As a further improvement of this utility model, the radially protruding step on the outer circumference of the PEEK pressure plate is connected to the outer circumference wall of the PEEK pressure plate above it through a first inclined surface, and the inner side wall of the retaining ring of the metal pressure ring forms a second inclined surface that matches the first inclined surface, and the second inclined surface is closely attached to the surface of the first inclined surface.

[0010] As a further improvement of this utility model, the metal pressure ring is tightly fitted onto the outside of the lower metal shell, and the metal pressure ring and the lower metal shell are fixedly connected by welding.

[0011] As a further improvement of this utility model, an upper tag slot and a lower tag slot are respectively formed on the lower surface of the upper metal shell and the inner bottom surface of the lower metal shell, which match the shape of the upper and lower ends of the RFID electronic tag chip and antenna. The upper and lower ends of the RFID electronic tag chip and antenna are respectively tightly inserted into the upper tag slot and the lower tag slot.

[0012] As a further improvement of this utility model, the lower end face of the upper metal shell and the inner bottom surface of the lower metal shell are respectively provided with an upper support column slot and a lower support column slot, and at least one PEEK support column is also provided. The upper and lower ends of each PEEK support column are respectively inserted into the upper support column slot and the lower support column slot, and the PEEK filling core covers the outer circumference of the PEEK support column.

[0013] As a further improvement of this utility model, a lower T-shaped platform with an upper diameter greater than the lower diameter is provided on the inner bottom surface of the lower metal shell, and an upper T-shaped platform with a lower diameter greater than the upper diameter is provided on the lower end surface of the upper metal shell. The PEEK filling core is tightly wrapped around the lower T-shaped platform and the outer side of the T-shaped platform.

[0014] As a further improvement of this utility model, the upper end face of the side wall of the lower metal shell, the upper end face of the PEEK filling core, and the upper end face of the radially convex flange on the outer circumference of the lower end of the upper metal shell are located on the same plane, and they together form a sealing contact surface. The roughness of the sealing contact surface is less than Ra0.8. The PEEK pressure plate and the sealing gasket are interference-fitted on the outer side of the upper metal shell, and the sealing gasket is tightly attached to the sealing contact surface.

[0015] The beneficial effects of this utility model are as follows: This utility model uses PEEK-filled plastic to in-mold injection seal and encapsulate the chip and antenna of the RFID electronic tag, and protects them on the outside with a stainless steel upper shell, a metal lower shell, and a metal pressure ring. It is also sealed with a perfluoropolymer gasket, which fully seals the chip and antenna of the RFID electronic tag. Since the coefficient of thermal expansion of PEEK material is 3-4 times that of metal, the sealing performance of this structure is better at high temperatures, thus ensuring the sealing performance of the encapsulation structure in high-temperature environments and achieving full protection for the RFID electronic tag. This encapsulation mechanism can withstand high temperatures of 250°C and external pressure of 150 MPa, effectively protecting the chip and antenna inside the encapsulation structure, allowing the chip and antenna to be used for a long time under high temperature and high pressure conditions. Attached Figure Description

[0016] Figure 1 This is a front view of the RFID electronic tag packaging structure of this utility model;

[0017] Figure 2 for Figure 2 Cross-sectional view of the middle AA section;

[0018] Figure 3 This is an exploded view of the RFID electronic tag packaging structure of this utility model;

[0019] Figure 4 This is a diagram showing the injection molding filling state of the PEEK material according to this utility model;

[0020] Figure 5 for Figure 4 Cross-sectional view of the middle BB section;

[0021] Figure 6 This is a schematic diagram showing the location of the sealing contact surface that requires precision machining in this utility model;

[0022] Figure 7 This is a diagram showing the completed assembly of the sealing gasket and PEEK pressure plate of this utility model.

[0023] Figure 8 This is a schematic diagram of the high-frequency welding position between the metal pressure ring and the metal lower shell of this utility model. Detailed Implementation

[0024] Example: An RFID electronic tag packaging structure includes a metal shell, a PEEK-filled inner core 1, a PEEK pressure plate 2, and a sealing gasket 3. The upper end of the metal shell has an opening structure. The PEEK-filled inner core 1 is fixedly filled inside the metal shell. The PEEK-filled inner core 1 has a chip 4 receiving cavity and an antenna 5 receiving cavity formed therein for stopping and accommodating the RFID electronic tag chip 4 and antenna 5. The sealing gasket 3 covers the upper side of the PEEK-filled inner core 1. The PEEK pressure plate 2 is fixedly installed inside the opening end of the metal shell. The PEEK pressure plate 2 is pressed tightly against the upper surface of the sealing gasket 3 so that the sealing gasket 3 is in sealed contact with the inner sidewall of the metal shell and the upper surface of the PEEK-filled inner core 1. The signal can communicate with the antenna 5 of the RFID electronic tag through the opening structure of the metal shell and through the PEEK pressure plate 2 and the sealing gasket 3.

[0025] The PEEK-filled core 1 is preferably made of PEEK filled plastic containing 30% glass fiber reinforcement, molded through in-mold injection. This type of PEEK-filled core 1 can operate at a long-term temperature of up to 260°C. The sealing gasket 3 is preferably made of perfluoropolymer, which can operate at a long-term temperature of up to 350°C. The metal shell is preferably made of stainless steel, which will not corrode over long-term use. After the RFID electronic tag chip 4 and antenna 5 are encapsulated through the above encapsulation structure, the metal shell can withstand strong external pressure. At the same time, the coefficient of thermal expansion of PEEK is 3-4 times that of metal. Therefore, in high-temperature environments, this structure has better sealing performance and can effectively protect the chip 4 and antenna 5 encapsulated within it to achieve a long-term stable sealing state. This sealing structure has excellent high-temperature resistance, corrosion resistance, and high-pressure resistance. Meanwhile, because there is an opening structure on the metal shell, it does not block the signal, allowing for smooth transmission of communication signals.

[0026] The metal outer shell includes a lower metal shell 6, an upper metal shell 7, and a metal pressure ring 8. The lower metal shell 6 is a barrel structure with an open top. The upper metal shell can be fixedly connected to the upper surface of the PEEK filling core 1 to form an integral structure. The upper metal shell covers the chip 4 and antenna 5 of the RFID electronic tag. The outer diameter of the upper metal shell 7 is smaller than the inner diameter of the upper opening of the lower metal shell 6. The sealing gasket 3 is sleeved on the outside of the upper metal shell 7. The sealing gasket 3 completely covers the annular upper surface of the PEEK filling core 1 located between the lower metal shell 6 and the upper metal shell 7. The PEEK pressure plate 2 is tightly sleeved on the outside of the upper metal shell 7 and presses the upper side of the sealing gasket 3. The metal pressure ring 8 can be fixedly installed on the lower metal shell 6 and presses the upper end of the PEEK pressure plate 2. The metal lower shell 6, metal upper shell 7, and metal pressure ring 8 are preferably made of stainless steel SUS316L. The metal shell is designed as a split structure to facilitate the encapsulation of RFID electronic tags. The annular gap between the upper openings of the metal upper shell 7 and the metal lower shell 6 can be used for signal transmission, and the metal pressure ring 8 can ensure the stable connection of the entire encapsulation structure.

[0027] A radially convex flange 71 is formed on the outer circumferential wall of the lower end of the upper metal shell 7. The sealing gasket 3 covers the upper end face of the flange 71 on the outer side of the upper metal shell 7 and the upper end face of the side wall of the lower metal shell 6. The lower end of the PEEK pressure plate 2 completely covers the upper surface of the sealing gasket 3. The sealing gasket 3 completely covers and seals the gap between the upper metal shell 7, the lower metal shell 6, and the PEEK filling core 1 by covering the lower flange 71 of the upper metal shell 7 and the upper end face of the side wall of the lower metal shell 6. The seal is stable, and the PEEK pressure plate 2 presses down on the lower flange 71 of the upper metal shell 7 and the upper end face of the side wall of the lower metal shell 6, which can ensure a stable connection between the upper metal shell 7, the PEEK filling core 1, and the lower metal shell 6.

[0028] A radially convex step 21 is formed on the outer circumference of the PEEK pressure plate 2, and a radially concave retaining ring 81 is formed on the inner sidewall of the upper end of the metal pressure ring 8. The retaining ring 81 of the metal pressure ring 8 abuts tightly against the radially convex step 21 of the PEEK pressure plate 2. The PEEK pressure plate 2 forms a stepped structure, which allows the upper end face of the PEEK pressure plate 2, the upper end face of the metal upper shell 7, and the upper end face of the metal pressure ring 8 to be located on the same plane after encapsulation. This makes the entire encapsulation structure form a small block with a regular shape, which is convenient for insertion into the small hole of the drill pipe or well casing.

[0029] The radially protruding step 21 on the outer circumference of the PEEK pressure plate 2 is transitioned to the outer circumference wall of the PEEK pressure plate 2 above it via a first inclined surface 22. The inner sidewall of the retaining ring 81 of the metal pressure ring 8 forms a second inclined surface 82 that matches the first inclined surface 22, and the second inclined surface 82 is tightly attached to the surface of the first inclined surface 22. The inclined surface contact allows for better assembly sealing, tighter contact, greater clamping force, and smoother assembly.

[0030] The metal retaining ring 8 is tightly fitted onto the outside of the lower metal shell 6, and the metal retaining ring 8 and the lower metal shell 6 are fixedly connected by welding. After the metal retaining ring 8 and the outer wall of the lower metal shell 6 are connected by an interference fit, they are further fixed by high-frequency welding, which can improve the connection strength of the overall structure. Even under great pressure and tension, they will not come apart. The lower end of the metal retaining ring 8 is preferably flush with the lower end of the lower metal shell 6, and the lower edge of the lower metal shell 6 can form a rounded corner. During welding, the solder can be accommodated in the groove formed between the rounded corner of the lower end of the lower metal shell 6 and the lower end of the metal retaining ring 8, so that the lower end of the entire packaging structure is flush.

[0031] On the lower surface of the upper metal shell 7 and the inner bottom surface of the lower metal shell 6, upper tag slots 72 and lower tag slots 61, respectively, are formed to match the shapes of the upper and lower ends of the RFID electronic tag's chip 4 and antenna 5. The upper and lower ends of the RFID electronic tag's chip 4 and antenna 5 are tightly inserted into the upper tag slots 72 and lower tag slots 61, respectively. During packaging, the upper and lower ends of the RFID electronic tag's chip 4 and antenna 5 are first inserted into the upper tag slots 72 and lower tag slots 61, respectively, to achieve preliminary positioning of the RFID electronic tag with the upper metal shell 7 and the lower metal shell 6, facilitating the placement of its pre-assembled structure into the injection mold for in-mold injection molding.

[0032] The lower end face of the upper metal shell 7 and the inner bottom surface of the lower metal shell 6 are respectively provided with an upper support column slot and a lower support column slot. At least one PEEK support column 9 is also provided. The upper and lower ends of each PEEK support column 9 are respectively inserted into the upper and lower support column slots. The PEEK filling core 1 covers the outer circumference of the PEEK support column 9. There can be one, two, or more PEEK support columns 9, installed according to actual needs. Their installation purpose is to increase structural stability, ensure that the entire pre-assembled structure will not deform under pressure during in-mold injection molding, and ensure effective encapsulation of the RFID electronic tag chip 4 and antenna 5.

[0033] The inner bottom surface of the lower metal shell 6 is provided with a lower T-shaped platform 73, the upper diameter of which is larger than the lower diameter. The lower surface of the upper metal shell 7 is provided with an upper T-shaped platform 62, the lower diameter of which is larger than the upper diameter. The PEEK filled core 1 is tightly wrapped around the lower T-shaped platform 73 and the outer side of the T-shaped platform. The upper T-shaped platform 62 at the lower end of the upper metal shell 7 and the lower T-shaped platform 73 on the bottom surface of the lower metal shell 6 form an inverted structure, which can ensure that all parts form a stable whole after injection molding, and prevent the PEEK filled core 1 from separating from the upper metal shell 7 and the lower metal shell 6. In addition, several inward protrusions can be formed on the side wall of the lower metal shell 6, and an L-shaped protrusion can be formed at the lower end of the upper metal shell 7 to achieve embedded connection with the PEEK filled core 1.

[0034] The upper end face of the side wall of the lower metal shell, the upper end face of the PEEK filling core, and the upper end face of the radially convex flange on the outer circumference of the lower end of the upper metal shell are located on the same plane, and they together form a sealing contact surface. The roughness of the sealing contact surface is less than Ra0.8. The PEEK pressure plate and the sealing gasket are interference-fitted on the outer side of the upper metal shell, and the sealing gasket is tightly fitted to the sealing contact surface.

[0035] An RFID electronic tag encapsulation method, the specific steps of which are as follows:

[0036] Step 1: Fabricate the upper metal shell 7, lower metal shell 6, and metal pressure ring 8 using stainless steel materials;

[0037] Step 2: First, fix the RFID electronic tag chip 4 and antenna 5 into the upper tag slot 72 at the lower end of the processed metal upper shell 7 by interference fit, and insert the PEEK support columns 9 into the upper support column slots at the lower end of the metal upper shell 7 one by one, so that the metal upper shell 7, the RFID electronic tag chip 4 and antenna 5 and the PEEK support columns 9 form a fixed integrated structure.

[0038] Step 3: Install the metal upper shell 7 containing the RFID electronic tag chip 4, antenna 5, and PEEK support column 9 into the metal lower shell 6, and insert the lower ends of the RFID electronic tag chip 4, antenna 5, and PEEK support column 9 into the lower tag slot 61 and lower support column slot on the inner bottom surface of the metal lower shell 6.

[0039] Step 4: Fill the gap between the metal upper shell 7 and the metal lower shell 6 by injection molding. After injection molding, all parts are formed into a whole.

[0040] Step 5: The sealing contact surface formed by the combination of the upper end face of the side wall of the lower metal shell 6, the outer side of the upper metal shell 7, and the upper end face of the PEEK filling inner core 1 formed by PEEK filling material is precision machined on a CNC lathe. The surface roughness of the sealing surface is required to be less than Ra0.8.

[0041] Step 6: Place the sealing gasket 3 made of perfluoropolymer material on the outside of the metal upper shell 7, then heat the PEEK pressure plate 2 to 250°C, and place the heated PEEK pressure plate 2 on the outside of the metal upper shell 7. Press the PEEK pressure plate 2 into place under a pressure of 1000N using a press. After cooling, release the press. The sealing gasket 3 and the PEEK pressure plate 2 will then be sealed and adhered to the processed sealing area.

[0042] Step 7: Heat the processed metal pressure ring 8 to 250°C, and put the heated metal pressure ring 8 on the outside of the metal lower shell 6. Use a press to press the metal pressure ring 8 into place under a pressure of 10000N.

[0043] Step 8: High-frequency welding is performed on the seam 10 of the metal pressure ring 8 and the metal lower shell 6. After assembly, the RFID electronic tag chip 4 and antenna 5 are completely sealed and protected, and a signal transmission port without metal coverage is formed between the metal pressure ring 8 and the metal upper shell 7.

Claims

1. An RFID electronic tag packaging structure, characterized in that: The device includes a metal shell, a PEEK filling core (1), a PEEK pressure plate (2), and a sealing gasket (3). The upper end of the metal shell has an opening structure. The PEEK filling core is fixedly filled inside the metal shell. The PEEK filling core has a chip receiving cavity and an antenna receiving cavity for stopping and accommodating the chip (4) and antenna (5) of the RFID electronic tag. The sealing gasket covers the upper side of the PEEK filling core. The PEEK pressure plate is fixedly installed inside the opening end of the metal shell. The PEEK pressure plate is pressed tightly against the upper surface of the sealing gasket so that the sealing gasket is in sealed contact with the inner wall of the metal shell and the upper surface of the PEEK filling core. The signal can communicate with the antenna of the RFID electronic tag through the opening structure of the metal shell and through the PEEK pressure plate and the sealing gasket.

2. The RFID electronic tag packaging structure according to claim 1, characterized in that: The metal outer shell includes a lower metal shell (6), an upper metal shell (7), and a metal pressure ring (8). The lower metal shell is a barrel structure with an open top. The upper metal shell can be fixedly connected to the upper surface of the PEEK filling core to form an integral structure. The upper metal shell covers the chip and antenna of the RFID electronic tag. The outer diameter of the upper metal shell is smaller than the inner diameter of the upper opening of the lower metal shell. The sealing gasket is sleeved on the outside of the upper metal shell. The sealing gasket completely covers the annular upper surface of the PEEK filling core located between the lower metal shell and the upper metal shell. The PEEK pressure plate is tightly sleeved on the outside of the upper metal shell and presses the upper side of the sealing gasket. The metal pressure ring can be fixedly installed on the lower metal shell and presses the upper end of the PEEK pressure plate.

3. The RFID electronic tag packaging structure according to claim 2, characterized in that: A radially convex flange (71) is formed on the outer circumference of the lower end of the metal upper shell. The sealing gasket covers the upper end face of the flange on the outer side of the metal upper shell and the upper end face of the side wall of the metal lower shell. The lower end of the PEEK pressure plate completely covers the upper surface of the sealing gasket.

4. The RFID electronic tag packaging structure according to claim 2, characterized in that: A radially convex step (21) is formed on the outer circumference of the PEEK pressure plate, and a radially concave retaining ring (81) is formed on the inner sidewall of the upper end of the metal pressure ring. The retaining ring of the metal pressure ring abuts against the radially convex step of the PEEK pressure plate.

5. The RFID electronic tag packaging structure according to claim 4, characterized in that: The radially protruding step on the outer circumference of the PEEK pressure plate is connected to the outer circumference wall of the PEEK pressure plate above it through the first inclined surface (22). The inner wall of the retaining ring of the metal pressure ring forms a second inclined surface (82) that matches the first inclined surface. The second inclined surface is closely attached to the surface of the first inclined surface.

6. The RFID electronic tag packaging structure according to claim 2, characterized in that: The metal pressure ring is tightly fitted onto the outside of the lower metal shell, and the metal pressure ring and the lower metal shell are fixedly connected by welding.

7. The RFID electronic tag packaging structure according to claim 2, characterized in that: The upper tag slot (72) and the lower tag slot (61) are respectively formed on the lower surface of the upper metal shell and the inner bottom surface of the lower metal shell, which match the shape of the upper and lower ends of the RFID electronic tag chip and antenna. The upper and lower ends of the RFID electronic tag chip and antenna are respectively tightly inserted into the upper tag slot and the lower tag slot.

8. The RFID electronic tag packaging structure according to claim 2, characterized in that: The lower end face of the upper metal shell and the inner bottom face of the lower metal shell are respectively provided with an upper support column slot and a lower support column slot, and at least one PEEK support column (9) is also provided. The upper and lower ends of each PEEK support column are respectively inserted into the upper support column slot and the lower support column slot, and the PEEK filling core covers the outer circumference of the PEEK support column.

9. The RFID electronic tag packaging structure according to claim 2, characterized in that: The lower metal shell has a lower T-shaped platform (73) with an upper diameter greater than the lower diameter on its inner bottom surface, and the upper metal shell has an upper T-shaped platform (62) with a lower diameter greater than the upper diameter on its lower end surface. The PEEK filling core is tightly wrapped around the lower T-shaped platform and the outer side of the T-shaped platform.

10. The RFID electronic tag packaging structure according to claim 3, characterized in that: The upper end face of the side wall of the lower metal shell, the upper end face of the PEEK filling core, and the upper end face of the radially convex flange on the outer circumference of the lower end of the upper metal shell are located on the same plane, and they together form a sealing contact surface. The roughness of the sealing contact surface is less than Ra0.

8. The PEEK pressure plate and the sealing gasket are interference-fitted on the outer side of the upper metal shell, and the sealing gasket is tightly fitted to the sealing contact surface.

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