Temperature sensing device for microwave environment

Abstract

The invention discloses a temperature sensing device for a microwave environment. The temperature sensing device comprises a temperature sensing module and a signal processing module, the temperature sensing module comprises a metal shell, a heat-conducting medium filled in the metal shell, a temperature sensing element arranged in the heat-conducting medium, an electromagnetic wave shielding wire connected with the temperature sensing element, a silica gel sleeve arranged outside the electromagnetic wave shielding wire in a sleeving manner, a metal connector male plug, a metal connector female socket and an adapter plate; the signal processing module comprises an adapter plate connector female head, a signal conditioning module and a signal output connector female head; and the temperature sensing module and the signal processing module are electrically connected through the plugging of the adapter plate and the adapter plate connector female head. The beneficial effects of the invention are that the temperature measurement is accurate and stable in a microwave environment; the structure design is simple, batch production is facilitated, and maintenance operation is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature sensors, in particular to a high-precision temperature sensor device suitable for use in microwave environments such as microwave drying, microwave heating, microwave sterilization, and microwave extraction. Background Art

[0002] Traditional temperature sensors often face numerous challenges in microwave environments. The electromagnetic field of microwaves can severely interfere with the temperature sensor's signal transmission, resulting in inaccurate temperature measurements. Furthermore, factors such as high temperatures and high pressures in microwave environments place higher demands on the stability and reliability of temperature sensors.

[0003] Existing temperature sensing devices have the following main problems in microwave environments:

[0004] One is the problem of electromagnetic interference. The electromagnetic field of microwaves will generate induced current and eddy current in the sensor, causing distortion of the temperature measurement signal and increased measurement error.

[0005] The second problem is poor high-temperature stability. Traditional sensor materials are prone to aging at high temperatures, resulting in performance degradation and affecting temperature measurement accuracy.

[0006] The third is the problem of unstable signal transmission. Microwave interference may cause signal transmission interruption or error, affecting the continuity of temperature monitoring.

[0007] In order to solve these problems, the present invention provides a high-precision temperature sensing device suitable for microwave environments, which effectively resists microwave interference and improves temperature measurement accuracy through the selection of special materials and structural optimization. Summary of the Invention

[0008] The object of the present invention is to provide a temperature sensing device for use in a microwave environment, so as to solve the problem in the prior art that traditional temperature sensing devices have poor performance in a microwave environment.

[0009] The purpose of the present invention can be achieved through the following technical solutions:

[0010] A temperature sensing device for use in a microwave environment, comprising:

[0011] A temperature sensing module, comprising a metal housing, a heat-conducting medium filled within the metal housing, a temperature sensing element disposed within the heat-conducting medium, an electromagnetic wave shielding wire connected to the temperature sensing element, a silicone sleeve sleeved over the electromagnetic wave shielding wire, a metal connector male plug, a metal connector female socket, and an adapter plate, wherein an end of the electromagnetic wave shielding wire remote from the temperature sensing element is connected to the metal connector male plug, and the metal connector male plug is connected to the adapter plate via the metal connector female socket;

[0012] A signal processing module, the signal processing module comprising an adapter board connector female head, a signal conditioning module, and a signal output connector female head, the adapter board connector female head being connected to the input end of the signal conditioning module via a signal input line, and the output end of the signal conditioning module being connected to the signal output connector female head via a signal output line;

[0013] The temperature sensing module and the signal processing module are electrically connected by plugging the adapter board into the female connector of the adapter board.

[0014] As a further solution of the present invention: the metal shell is made of copper, stainless steel or aluminum alloy, and has a cylindrical, strip or spherical shape. Its edges and corners are rounded and fixedly connected to the electromagnetic wave shielding wire through a locking rolling groove.

[0015] As a further solution of the present invention: the heat-conducting medium is thermal grease, thermal silica gel or metal thermal paste, with a filling rate of ≥95% and a thermal conductivity coefficient of ≥5W / (m·K).

[0016] As a further solution of the present invention: the temperature sensing element is a thermocouple, an NTC thermistor or a platinum resistor, and its lead wire is connected to the electromagnetic wave shielding wire by laser welding.

[0017] As a further solution of the present invention: the electromagnetic wave shielding wire includes a multi-layer nested structure, the inner layer is a signal transmission line, the middle layer is a metal braided shielding layer, and the outer layer is a fluororubber protective sleeve, and the shielding effectiveness is ≥60dB.

[0018] As a further solution of the present invention: the male plug of the metal connector includes a copper sleeve, a locking device and an internally threaded locking nut. When the silicone sleeve wrapped around the electromagnetic wave shielding wire passes through the copper sleeve, the male plug of the metal connector presses and locks the copper sleeve to connect with the silicone sleeve through the locking device; the female socket of the metal connector includes an externally threaded locking sleeve; the male plug of the metal connector and the female socket of the metal connector are connected through a pin and socket structure, and are tightened and fixed by the internally threaded locking nut and the externally threaded locking sleeve.

[0019] As a further solution of the present invention: one end of the silicone sleeve is connected to the copper sleeve by interference fit, and the other end is interference fit with the metal shell, and the interference fit amount is 0.2-0.5mm. The operating temperature range of the silicone sleeve is -40°C to 300°C.

[0020] As a further solution of the present invention: the copper sleeve, the metal shell, and the metal shielding layer of the electromagnetic wave shielding wire form a continuous integrated full-metal shielding shell, and the shielding gap is ≤0.1mm.

[0021] As a further solution of the present invention: the signal conditioning module includes:

[0022] High impedance input circuit, input impedance ≥ 10MΩ;

[0023] AD converter, resolution ≥ 24 bits;

[0024] Digital filter, using FIR filtering algorithm to filter digital temperature signal;

[0025] Temperature calibration procedure based on polynomial fitting to compensate for nonlinear errors.

[0026] As a further solution of the present invention: the signal conditioning module is fixed inside the protective shell, the inner wall of the protective shell is coated with a conductive coating, the conductive coating is electrically connected to the shielding layer of the signal input line and the signal output line to form a Faraday cage structure; the exposed ends of the signal input line and the signal output line are wrapped with heat shrink tubing.

[0027] Beneficial effects of the present invention:

[0028] (1) This application can effectively resist electromagnetic interference in microwave environments and have the accuracy and stability of temperature measurement through the selection of special materials and structural optimization;

[0029] (2) The temperature sensing device of the present application exhibits higher reliability, adaptability, sensitivity, high precision and wide range in a microwave environment, providing a more reliable solution for temperature monitoring of microwave environment appliances such as microwave ovens, microwave extractors, and induction cookers, thus filling the gaps in the existing technology;

[0030] (3) This application uses electromagnetic wave shielding wire and integrated metal shielding layer design to effectively shield the influence of microwaves on signal transmission and improve temperature measurement accuracy; the signal conditioning module is equipped with high-precision temperature signal acquisition and program calibration functions, which can achieve high-precision temperature measurement even in strong interference environments such as microwaves;

[0031] (4) This application uses high thermal conductivity materials as heat conduction media to improve heat conduction efficiency; uses electromagnetic wave shielding wires and signal transmission wires made of high temperature resistant materials to ensure signal transmission stability in high temperature environments;

[0032] (5) This application ensures stable signal transmission in a microwave environment by optimizing the signal transmission method and adopting an integrated metal shielding layer design, which helps to reduce data loss or errors;

[0033] (6) The structural design of this application is simple, which is convenient for mass production and simple to maintain and operate. The modules are connected by standardized interfaces, which is convenient for disassembly and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] Figure 1 It is a schematic structural diagram of the temperature sensing module of the present invention;

[0036] Figure 2 It is a structural diagram of the signal processing module of the present invention.

[0037] In the figure: 1. Thermal conductive medium; 2. Temperature sensing element; 3. Metal housing; 301. Locking rolled groove; 4. Silicone sleeve; 5. Electromagnetic wave shielding wire; 6. Copper sleeve; 7. Locking device; 8. Metal connector male plug; 9. Internal thread locking nut; 10. External thread locking sleeve; 11. Metal connector female socket; 12. Adapter board; 13. Adapter board connector female head; 14. Heat shrink tubing; 15. Signal input line; 16. Signal conditioning module; 17. Protective housing; 18. Signal output line; 19. Signal output connector female head. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in the description of the present invention, the meaning of "multiple" and "several" is at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0040] See also Figure 1 As shown, the present invention is a temperature sensing device for a microwave environment, including a temperature sensing module, which includes a metal shell 3, a heat-conducting medium 1 filled in the metal shell 3, a temperature sensing element 2 placed in the heat-conducting medium 1, an electromagnetic wave shielding wire 5 connected to the temperature sensing element 2, a silicone sleeve 4 sleeved on the outside of the electromagnetic wave shielding wire 5, a metal connector male plug 8, a metal connector female socket 11 and an adapter plate 12. The end of the electromagnetic wave shielding wire 5 away from the temperature sensing element 2 is connected to the metal connector male plug 8, and the metal connector male plug 8 is connected to the adapter plate 12 through the metal connector female socket 11.

[0041] When designing the temperature sensing module of the present application, the heat conducting medium 1 is thermal grease, thermal silica gel or metal thermal paste with a filling rate ≥ 95% and a thermal conductivity coefficient ≥ 5W / (m·K). The heat conducting medium 1 is filled inside the metal shell 3, thereby improving the heat conduction efficiency and ensuring that the temperature sensing element 2 can accurately sense the temperature.

[0042] When designing the temperature sensing module of the present application, the temperature sensing element 2 is a thermocouple, an NTC thermistor or a platinum resistor, and its leads are connected to the electromagnetic wave shielding wire 5 by laser welding. The temperature sensing element 2 is placed in the heat-conducting medium 1 and is connected to the electromagnetic wave shielding wire 5 for signal connection, which can sense the temperature in the microwave environment with high precision.

[0043] When designing the temperature sensing module of the present application, the metal shell 3 is made of copper, stainless steel or aluminum alloy, and its shape is a circular tube, a long strip or a spherical shape. Its edges and corners are rounded to prevent mechanical damage to the electromagnetic wave shielding wire 5, and it maintains a fixed connection with the electromagnetic wave shielding wire 5 through the locking rolling groove 301. The metal shell 3 protects the temperature sensing element 2, and its metal material can effectively shield the influence of microwaves in the microwave environment on signal transmission.

[0044] When designing the temperature sensing module of the present application, the silicone sleeve 4 is wrapped around the outside of the electromagnetic wave shielding wire 5 to provide protection and insulation. The silicone sleeve 4 is made of silicone material and has good high temperature resistance and insulation properties. When in use, one end of the silicone sleeve 4 is connected to the copper sleeve 6 by interference fit, and the other end is interference fit with the metal shell 3, and the interference fit amount is 0.2 to 0.5 mm. The operating temperature range of the silicone sleeve 4 is -40°C to 300°C.

[0045] When designing the temperature sensing module of the present application, the electromagnetic wave shielding wire 5 is connected to the temperature sensing element 2 and the metal connector male plug 8 to effectively shield the influence of microwaves on signal transmission. The electromagnetic wave shielding wire 5 includes a multi-layer nested structure, the inner layer is the signal transmission line, the middle layer is the metal braided shielding layer, and the outer layer is a fluororubber protective cover with a shielding efficiency of ≥60dB. The outer layer of the fluororubber protective cover is made of high-temperature resistant material to ensure the stability of signal transmission in high-temperature environments. The middle layer of the metal braided shielding layer is the signal shielding layer, which effectively shields the influence of microwaves on signal transmission.

[0046] When designing the temperature sensing module of the present application, the metal connector male plug 8 includes a copper sleeve 6, a locking device 7 and an internal thread locking nut 9. When the silicone sleeve 4 wrapped with the electromagnetic wave shielding wire 5 passes through the copper sleeve 6, the metal connector male plug 8 presses and locks the copper sleeve 6 to connect with the silicone sleeve 4 through the locking device 7; the metal connector female socket 11 includes an external thread locking sleeve 10; the metal connector male plug 8 and the metal connector female socket 11 are connected through a pin and socket structure, and are tightened and fixed by the internal thread locking nut 9 and the external thread locking sleeve 10; the metal connector male plug 8, the metal connector female socket 11 and the adapter plate 12 are conveniently and securely installed at the position to facilitate the connection between the temperature sensing module and the signal processing module and achieve stable signal transmission.

[0047] When designing the temperature sensing module of the present application, the copper sleeve 6 and the metal shell 3 and the metal shielding layer of the electromagnetic wave shielding wire 5 constitute a continuous integrated all-metal shielding shell with a shielding gap of ≤0.1mm. Through the design of the electromagnetic wave shielding wire 5 and the integrated metal shielding layer, the metal connector male plug 8 and the metal connector female socket 11 used at the transfer position between the temperature sensing module and the signal processing module are both made of metal, so that the metal shell in the temperature sensing signal process limits the electromagnetic field to the outer surface, replacing the metal shielding layer to form a seamless conductor, which can block the microwave penetration path. No electromagnetic leakage points will appear during the signal transmission process, thereby effectively shielding the influence of microwaves on signal transmission and improving the temperature measurement accuracy.

[0048] like Figure 2 As shown, the temperature sensing device of the present application also includes a signal processing module, which includes an adapter board connector female head 13, a signal conditioning module 16 and a signal output connector female head 19. The adapter board connector female head 13 is connected to the input end of the signal conditioning module 16 through a signal input line 15, and the output end of the signal conditioning module 16 is connected to the signal output connector female head 19 through a signal output line 18.

[0049] When designing the signal processing module of the present application, the signal conditioning module 16 is fixed inside the protective shell 17, and the inner wall of the protective shell 17 is coated with a conductive coating. The conductive coating is electrically connected to the shielding layer of the signal input line 15 and the signal output line 18 to form a Faraday cage structure; the exposed ends of the signal input line 15 and the signal output line 18 are wrapped with a heat shrink tubing 14, and the protective shell 17 can protect the signal conditioning module 16 from the influence of the external environment. At the same time, when the signal input line 15 and the signal output line 18 are connected to the signal conditioning module 16, the signal input line 15 enters the signal conditioning module 16 to form an antenna effect, which can radiate 1 / 4 wavelength energy. The Faraday cage structure of this design can cut off the radiation path by overlapping the conductive coating with the cable shielding layer, eliminate the influence of the external electric field, and ensure the stability of signal processing. The signal conditioning module 16 can collect the temperature signal of the temperature sensing module and convert it into temperature data for external output.

[0050] When designing the signal processing module of the present application, the signal conditioning module 16 includes a high-impedance input circuit with an input impedance ≥10MΩ, which can suppress microwave induced current and solve the interference problem at the signal source end; the AD converter resolution ≥24 bits ensures the accuracy of weak signal acquisition and meets the ±0.5℃ temperature measurement accuracy requirement; the digital filter uses an FIR filtering algorithm to filter the digital temperature signal to eliminate power frequency and microwave harmonic noise, which is the core means of resisting electromagnetic interference; the temperature calibration program is based on polynomial fitting to compensate for nonlinear errors. For example, the polynomial fitting is a cubic curve fitting and should satisfy the following calculation formula: T = a·R^3+b·R^2+c·R+d, where R is the resistance value of the temperature sensing element 2, T is the output temperature value, and a, b, c, and d are preset constants, so as to compensate for the nonlinear error of the sensor; the signal conditioning module 16 inputs, converts, filters and calibrates the temperature sensing signal in sequence to ensure high-precision temperature measurement over the entire range.

[0051] During the use of the temperature sensing device of the present application, the temperature sensing module and the signal processing module are electrically connected by plugging the adapter board 12 into the female connector 13 of the adapter board. By selecting special materials and optimizing the structure, the temperature sensing device of the present application can effectively resist electromagnetic wave interference in a microwave environment and have accuracy and stability in temperature measurement. Compared with traditional sensors, the temperature sensing device of the present application exhibits higher reliability, adaptability, sensitivity, high precision and wide range in a microwave environment, providing a more reliable solution for temperature monitoring of microwave environment appliances such as microwave ovens, microwave extractors, and induction cookers, filling the shortcomings of the existing technology.

[0052] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A temperature sensing device for microwave environment, characterized in that: include: A temperature sensing module, comprising a metal shell (3), a heat-conducting medium (1) filled in the metal shell (3), a temperature sensing element (2) placed in the heat-conducting medium (1), an electromagnetic wave shielding wire (5) connected to the temperature sensing element (2), a silicone sleeve (4) sleeved on the outside of the electromagnetic wave shielding wire (5), a metal connector male plug (8), a metal connector female socket (11) and an adapter plate (12), wherein one end of the electromagnetic wave shielding wire (5) away from the temperature sensing element (2) is connected to the metal connector male plug (8), and the metal connector male plug (8) is connected to the adapter plate (12) via the metal connector female socket (11); A signal processing module, the signal processing module comprising an adapter board connector female head (13), a signal conditioning module (16) and a signal output connector female head (19), the adapter board connector female head (13) being connected to an input end of the signal conditioning module (16) via a signal input line (15), and the output end of the signal conditioning module (16) being connected to the signal output connector female head (19) via a signal output line (18); The temperature sensing module and the signal processing module are electrically connected by plugging the adapter board (12) into the female connector (13) of the adapter board.

2. A temperature sensing device for microwave environment according to claim 1, characterized in that: The metal shell (3) is made of copper, stainless steel or aluminum alloy and has a cylindrical, strip or spherical shape. Its edges and corners are rounded and are fixedly connected to the electromagnetic wave shielding wire (5) through a locking rolling groove (301).

3. A temperature sensing device for microwave environment according to claim 1, characterized in that: The heat-conducting medium (1) is heat-conducting silicone grease, heat-conducting silica gel or metal heat-conducting paste, with a filling rate of ≥95% and a thermal conductivity coefficient of ≥5W / (m·K).

4. A temperature sensing device for microwave environment according to claim 1, characterized in that: The temperature sensing element (2) is a thermocouple, an NTC thermistor or a platinum resistor, and its lead wire is connected to the electromagnetic wave shielding wire (5) by laser welding.

5. The temperature sensing device for microwave environment according to claim 1, characterized in that: The electromagnetic wave shielding wire (5) comprises a multi-layer nested structure, wherein the inner layer is a signal transmission line, the middle layer is a metal braided shielding layer, and the outer layer is a fluororubber protective sleeve, and the shielding effectiveness is ≥60dB.

6. The temperature sensing device for microwave environment according to claim 1, characterized in that: The metal connector male plug (8) comprises a copper sleeve (6), a locking device (7) and an internal thread locking nut (9); when the silicone sleeve (4) wrapping the electromagnetic wave shielding wire (5) passes through the copper sleeve (6), the metal connector male plug (8) presses and locks the copper sleeve (6) to connect with the silicone sleeve (4) through the locking device (7); the metal connector female socket (11) comprises an external thread locking sleeve (10); the metal connector male plug (8) and the metal connector female socket (11) are connected through a pin and socket structure and are screwed and fixed by the internal thread locking nut (9) and the external thread locking sleeve (10).

7. A temperature sensing device for microwave environment according to claim 6, characterized in that: One end of the silicone sleeve (4) is connected to the copper sleeve (6) by interference fit, and the other end is sleeved with the metal shell (3) by interference fit, and the interference fit amount is 0.2 to 0.5 mm. The operating temperature range of the silicone sleeve (4) is -40°C to 300°C.

8. The temperature sensing device for microwave environment according to claim 6, characterized in that: The copper sleeve (6), the metal shell (3), and the metal shielding layer of the electromagnetic wave shielding wire (5) form a continuous integrated full-metal shielding shell, and the shielding gap is ≤0.1 mm.

9. The temperature sensing device for microwave environment according to claim 1, characterized in that: The signal conditioning module (16) comprises: High impedance input circuit, input impedance ≥ 10MΩ; AD converter, resolution ≥ 24 bits; Digital filter, using FIR filtering algorithm to filter digital temperature signal; Temperature calibration procedure based on polynomial fitting to compensate for nonlinear errors.

10. The temperature sensing device for microwave environment according to claim 9, characterized in that: The signal conditioning module (16) is fixed inside the protective shell (17), and the inner wall of the protective shell (17) is coated with a conductive coating, which is electrically connected to the shielding layer of the signal input line (15) and the signal output line (18) to form a Faraday cage structure; the exposed ends of the signal input line (15) and the signal output line (18) are wrapped with a heat shrink tubing (14).

Images