A Bluetooth temperature probe and a temperature measuring device

Abstract

The present invention discloses a Bluetooth temperature probe and a temperature measuring device, comprising a handle assembly, a circuit board (20), a probe housing (30), a battery (27), an antenna (10) and a probe tip (35), characterized in that: the Bluetooth temperature probe (45) is provided with an on-site setting type thermocouple device (25), the on-site setting type thermocouple device (25) is formed by spot welding a constantan spring piece and a copper clad sheet of the circuit board (20), the constantan spring piece abuts against the probe housing (30), and the metal ball formed by the spot welding is the temperature sensing head of the on-site setting type thermocouple device (25) for measuring temperature. By setting the front end of the probe tip to a flat and sharp edge shape, the Bluetooth temperature probe can easily insert into food materials. By providing the on-site setting type thermocouple device in the probe housing, not only is the temperature measurement faster and more accurate, but it can also be additionally provided according to the needs of the temperature measurement point, further ensuring the accuracy of the measured temperature.

Description

Technical Field:

[0001] The present invention relates to the technical field of temperature measuring instruments, and particularly to a Bluetooth temperature probe and a temperature measuring device. Background Art:

[0002] With the progress of technology and the improvement of living standards, people have put forward higher requirements for the taste and nutrition of food materials, and expect to obtain more accurate temperature values with a metal probe during the process of controlling the cooking of a whole piece of meat food material. In the prior art, a temperature probe generally installs a circuit board in a housing and relies on temperature sensing devices on the circuit board, such as an NTC thermistor or a digital NTC chip, to sense temperature changes. During the temperature sensing process, since the devices installed on the circuit board cannot directly contact the inner wall of the housing, the transmission of thermal changes requires heat conduction through an insulating medium or an air medium. Coupled with the error of the temperature sensing device itself, it will cause a lag in the measured temperature change and a large error value during the actual measurement process, unable to ensure the accuracy of the temperature measurement value, and it is easy to make it difficult to master the degree of doneness of the food. Whether the food is undercooked or overcooked will directly affect the user's taste or appetite, and will also bring corresponding health and safety hazards.

[0003] There is also a common problem when using a temperature probe, that is, when the meat food material is relatively thick, due to the single pointed structure design at the front end of most temperature probes in the prior art, when the temperature probe is inserted into the food material, a thick needle body will encounter a large resistance, resulting in a situation where it is difficult to insert the temperature probe into the food material, which greatly affects the user's use. Summary of the Invention:

[0004] To solve the problems of inaccurate temperature measurement values of the temperature probe resulting in poor food taste and difficulty in inserting the temperature probe into the food material as mentioned above, the present invention proposes a Bluetooth temperature probe and a temperature measuring device.

[0005] The Bluetooth temperature probe provided by the present invention includes a handle assembly, a circuit board, a probe housing, a battery, an antenna, and a probe head, and is characterized in that: the Bluetooth temperature probe is provided with an on-site set thermocouple device, and the on-site set thermocouple device is formed by spot welding a constantan shrapnel and a copper clad of the circuit board, and its constantan shrapnel abuts against the probe housing, and the metal ball formed by the spot welding is the temperature sensing head of the on-site set thermocouple device for measuring temperature.

[0006] As a further improvement of the present invention, the number of the on-site set thermocouple devices is at least two groups, which are set according to the different lengths of the circuit board.

[0007] As a further improvement of the present invention, the front part of the probe head has a flat and sharp edge, and the material is ceramic or stainless steel.

[0008] As a further improvement of the present invention, the flat sharp edge of the probe head gradually narrows, presenting a decreasing structure.

[0009] As a further improvement of the present invention, the handle assembly includes an insulating handle, a screw head, and a sealing ring. The screw head is disposed at the tail of the insulating handle, and the sealing ring is disposed between the insulating handle and the screw head.

[0010] As a further improvement of the present invention, the antenna is disposed inside the insulating handle and the probe housing, with one end electrically connected to the circuit board and the other end connected to the screw head to realize signal transmission and reception.

[0011] As a further improvement of the present invention, a Bluetooth main chip and a digital thermocouple processing chip are also disposed on the circuit board.

[0012] As a further improvement of the present invention, the battery is disposed between the circuit board and the probe head and is electrically connected to the circuit board.

[0013] For the temperature measuring device provided by the present invention, the temperature measuring device includes using the above-mentioned Bluetooth temperature probe for temperature measurement.

[0014] As a further improvement of the present invention, the temperature measuring device further includes a signal transmission charging box. The signal transmission charging box is provided with a power supply component, a control component, and a wireless transmission component. After the wireless transmission component receives the information sent by the Bluetooth temperature probe, it is transmitted to the control component for processing, and the information processed by the control component is then sent out to a mobile terminal or the cloud through the wireless transmission component.

[0015] The beneficial effects of the present invention are as follows: By setting the front end of the probe head to the shape of a flat sharp edge, the Bluetooth temperature probe can be easily inserted into the food material, greatly facilitating the use of the user. By providing a field-set thermocouple device inside the probe housing, the temperature sensing head is more closely attached to the metal shell of the temperature probe. When the high temperature in the roasting environment causes the temperature of the roasted meat to rise, the time lag for the temperature to be transmitted from the temperature sensing head to the display device is greatly reduced. When the temperature of the temperature sensing head changes, a pair of thermocouple measurement endpoints are formed between the field-set thermocouple device and the copper-clad layer of the circuit board, and an electromotive force is generated therebetween, providing a raw temperature change value with very little delay and stable accuracy for chip analysis. Compared with the method of measuring temperature using the temperature sensing devices in the prior art, the method of measuring temperature using the field-set thermocouple device not only measures temperature more quickly and accurately, but also can add the setting of the field-set thermocouple device at multiple temperature measurement points as needed, further ensuring the accuracy of the measured temperature and better ensuring the high-quality taste of the roasted meat. Description of the Drawings:

[0016] Figure 1 It is a schematic side view of a Bluetooth temperature probe according to the present invention;

[0017] Figure 2 It is a schematic front view of a Bluetooth temperature probe;

[0018] Figure 3 It is a schematic front view of the blade tip structure of a Bluetooth temperature probe;

[0019] Figure 4 It is a schematic side view of the blade tip structure of a Bluetooth temperature probe;

[0020] Figure 5 It is a schematic overall view of a Bluetooth temperature probe and a signal transmission charging box;

[0021] Figure 6 It is a partial circuit diagram of a Bluetooth temperature probe;

[0022] Figure 7 It is a partial circuit diagram of the power supply component, control component and wireless transmission component of the signal transmission charging box.

[0023] The corresponding relationship between the reference numerals and the component names is as follows:

[0024] Screw head - 5; Sealing ring - 7; Antenna - 10; Insulating handle - 15;

[0025] Bluetooth main chip - 17; Circuit board - 20; Digital thermocouple processing chip - 22;

[0026] Field - set thermocouple device - 25; Battery - 27; Probe housing - 30;

[0027] Probe tip - 35; Signal transmission charging box - 40, Bluetooth temperature probe - 45. Specific embodiments:

[0028] Next, the technical solutions in the embodiments of the present invention will be described in detail with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described through the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0029] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, then the directional indications will also change accordingly.

[0030] Such as Figure 1 and Figure 2As shown, an embodiment of a Bluetooth temperature probe disclosed by the present invention, the Bluetooth temperature probe includes a screw head 5, a sealing ring 7, an antenna 10, an insulating handle 15, a Bluetooth main chip 17, a circuit board 20, a digital thermocouple processing chip 22, a field-setting type thermocouple device 25, a battery 27, a probe housing 30 and a probe head 35. The front part of the probe head 35 has a flat and sharp edge, and the edge gradually narrows from the back to the front, showing a decreasing structure. It is made of ceramic or stainless steel material and meets the relevant food safety grades. When the probe head 35 is made of stainless steel, it can be used as the negative electrode for charging. The probe housing 30 is made of metal material and is selected as stainless steel material in this embodiment. It is a conductor for heat transfer of food materials and can also be used as the negative electrode for charging. The inside of the probe housing 30 is hollow and is provided with the field-setting type thermocouple device 25, the battery 27, the Bluetooth main chip 17, the digital thermocouple processing chip 22 and the circuit board 20. The Bluetooth main chip 17 and the digital thermocouple processing chip 22 are arranged on the circuit board 20.

[0031] The field-setting type thermocouple device 25 is formed by spot welding a constantan elastic sheet and a copper-clad sheet of the circuit board 20. Its constantan elastic sheet abuts against the probe housing 30. The metal ball formed by the spot welding is the temperature sensing head of the field-setting type thermocouple device 25 and is used for measuring temperature. When the temperature of the temperature sensing head changes, a measurement electrode pair is formed between the copper-clad sheet of the circuit board 20 and the measurement point of the constantan elastic sheet of the field-setting type thermocouple device, which are at different potentials and generate corresponding thermoelectric potentials. With the rise and fall of temperature, an electromotive force change is formed, providing a raw temperature change value with very little delay and stable accuracy for the temperature analysis of the digital thermocouple processing chip 22. The ingenious design of the field-setting type thermocouple device 25 is not only used for measuring temperature. The constantan elastic sheet also serves as an elastic fixing part to fix the circuit board 20 in the probe housing 30 and serves as the negative electrode for charging the battery 27. In addition, according to the size of the food material to be heated and the length of the corresponding circuit board, the field-setting type thermocouple device 25 can be added at different positions. By setting multiple groups of measurement points, the accuracy of the measured temperature can be further ensured. The battery 27 is arranged between the circuit board 20 and the probe head 35 and is electrically connected to the circuit board 20. The battery 27 is arranged at the front end of the Bluetooth temperature probe because when the Bluetooth temperature probe is inserted into food, since the food contains moisture and the front end of the probe contacts it, the temperature is relatively low, while the back end of the probe will feel a higher temperature. Therefore, arranging the battery 27 at the front end of the Bluetooth temperature probe can minimize the influence of high temperature on the battery 27 to ensure its normal operation.

[0032] The insulating handle 15 is made of insulating materials such as ceramics or high-temperature plastics. The screw head 5 is arranged at the tail of the insulating handle 15. The screw head 50 is made of metal material, and is selected as stainless steel material in this embodiment for fixing, and can also be used as the positive electrode for charging. The sealing ring 7 is arranged between the insulating handle 15 and the screw head 5. The antenna 10 is arranged inside the insulating handle 15. In this embodiment, the antenna 10 is selected as a spring. One end of the antenna 10 is electrically connected to the circuit board 20, and the other end is connected to the screw head 5. When installed, the antenna 10 is compressed and forms an inductive environment resonant with the wireless frequency with the screw head 5 to realize signal transmission and reception. At the same time, since the screw head 5 is the positive electrode for battery charging in the circuit of the circuit board 20, electric energy is transmitted to the positive electrode on the circuit board 20 through the antenna 10 in contact with the screw head 5 to charge the battery 27. The antenna 10 and the positive electrode of the battery 27 are signal-isolated through a resistor or an inductor, which will not cause attenuation of the wireless signal and ensures the stability and reliability of the wireless signal during transmission.

[0033] As Figure 3 and Figure 4 shown, it is another embodiment disclosed by the present invention. Under the condition that other components are the same as those in the above embodiment, the probe head 35 is made of ceramic or stainless steel material, and the front part has a flat and sharp edge, and the edge is wider than the front and rear ends of the probe head 35. When the meat is firm, the Bluetooth temperature probe can also be easily inserted into the food material, avoiding the situation that the Bluetooth temperature probe encounters great resistance when inserted into the food material, thus making it difficult to use, and greatly facilitating the use of the user. Another type is the probe head with a gradually widened pointed flat head. As Figure 1 and Figure 2 shown, it can be used when the meat is relatively loose, providing another choice for the user.

[0034] As Figure 5 shown, it is a temperature measuring device disclosed by the present invention. The temperature measuring device includes the Bluetooth temperature probe 45 and the signal transmission charging box 40 provided in the above embodiment. The power supply component charging circuit and the storage space provided in the signal transmission charging box 40 can store and charge the Bluetooth temperature probe 45. The control component and the wireless transmission component provided inside are used to receive the wireless signal sent by the Bluetooth temperature probe 45 and amplify and send it, so that a reliable wireless signal can be received by a mobile terminal or the cloud.

[0035] As Figure 6As shown in the figure, the charging process of the Bluetooth temperature probe 45 is as follows: When the Bluetooth temperature probe 45 is reinstalled into the signal transmission charging box 40, the screw head 5 of the Bluetooth temperature probe 45 contacts the output positive metal part provided inside the signal transmission charging box 40. A stable voltage is provided by the built-in power supply component circuit of the signal transmission charging box 40 and connected to the screw head 5. The DC voltage passes through the antenna AN1, through the L3 - L2 - L1 inductors and then through the L4 bead inductor to the VBAS point, causing the MOSFET Q1 to be reverse cut-off to turn off the power supply of the Bluetooth chip, so that the Bluetooth chip stops working. At the same time, it charges the built-in battery E1 of the Bluetooth temperature probe with constant voltage and current limiting through the D1 diode and the current limiting resistor R1. When the Bluetooth temperature probe 45 is charging, the wireless signal is in the off state, and when it is not charging, the wireless signal is on. Charging does not affect the transmission of the wireless signal.

[0036] As Figure 6 shown in the figure, the working process of the Bluetooth temperature probe 45 is as follows: When the Bluetooth temperature probe 45 is taken out of the storage space of the signal transmission charging box 40, since the VBAS point loses the DC voltage, the MOSFET Q1 is turned on to work. The built-in battery E1 conducts from the source terminal to the drain terminal of the MOSFET Q1, making BAT1+ equal to connecting the positive pole of the battery to supply power to the Bluetooth chip. At this time, the Bluetooth chip starts to work, and the IO port GPIO08 of the Bluetooth chip supplies power to the digital thermocouple conversion chip U2 through the resistor R3. When the Bluetooth temperature probe 45 contacts the food material, the thermocouple chip U2 starts to collect the voltage change of the on-site set-type thermocouple device 25 and converts it into a digital signal of the digital temperature that can be read by the MCU. The data is read through the IO port GPIO09 of the Bluetooth chip U1, and is calculated and converted by U1 and transmitted as a Bluetooth protocol data packet through the REP point through the inductors L1 - L2 - L3 - antenna AN1 to radiate and transmit signals externally.

[0037] As Figure 7As shown in the figure, the charging process of the circuit components inside the signal transmission charging box 40 is as follows: When an external power adapter is inserted into the TYPE-C port of the signal transmission charging box 40 through a USB cable, the 5V power supply is connected to the VIN point through the TYPE-C socket, and the built-in lithium battery J1 is charged through the charging management chip U1. The current control and full-charge stop during the charging process are automatically completed by U1. During the charging process, the VIN voltage is regulated by the LDO U2 to output VCC, which powers the Bluetooth main chip, enabling the Bluetooth main chip to start working and reading the status of the STBY pin of the charging management chip to drive the indicator LED1 to display the charging status or full-charge status. The Bluetooth wireless signal is turned off inside the Bluetooth chip throughout the process to reduce power consumption. When the Bluetooth temperature probe 45 is in the storage space of the signal transmission charging box 40 and the circuit inside the signal transmission charging box 40 is in the charging state, the internal regulated power supply output terminal VCC provides a charging voltage to the Bluetooth temperature probe 45 through the metal contact to charge it. At the same time, since the screw head 5 of the Bluetooth temperature probe 45 shorts the two ends of the metal contact of the signal transmission charging box 40, the MOSFET Q1 is turned on, and the Bluetooth chip IO port K1 reads a low level, and the chip software automatically turns off the wireless signal output of the Bluetooth chip.

[0038] The specific working process of the control component and the wireless transmission component inside the signal transmission charging box 40 is as follows: When the Bluetooth temperature probe 45 is taken out from the storage space inside the signal transmission charging box 40, the control component and the wireless transmission component inside the signal transmission charging box 40 immediately start working. When the wireless signal of the Bluetooth temperature probe 45 is received, it immediately performs automatic pairing and reads the temperature data transmitted by the Bluetooth temperature probe 45, and amplifies and forwards it to the mobile terminal APP, enabling the APP to obtain accurate temperature data and display it in the APP. When the temperature value reaches the set value, the APP alarm prompt is triggered, emitting a prompt sound or vibration to remind the user that the heated food has reached the set temperature.

[0039] By setting the front end of the probe head to a flat and sharp edge shape, the Bluetooth temperature probe can be easily inserted into the food material, which greatly facilitates the use of users. By providing a field-set thermocouple device inside the probe housing, the temperature sensing head is more closely attached to the metal shell of the temperature probe. When the high temperature in the barbecue environment causes the barbecue to heat up, the time lag for the temperature to be transmitted to the display device through the temperature sensing head is greatly reduced. When the temperature of the temperature sensing head changes, a pair of thermocouple measurement endpoints are formed between the field-set thermocouple device and the copper clad of the circuit board, and an electromotive force is generated therebetween, providing a very small delay and stable and accurate original temperature change value for chip analysis. Compared with the method of measuring temperature using the temperature sensing device in the prior art, the method of measuring temperature using the field-set thermocouple device not only measures temperature more quickly and accurately, but also can add the setting of the field-set thermocouple device at multiple temperature measurement points as needed, further ensuring the accuracy of the measured temperature and better ensuring the excellent taste of the barbecue.

[0040] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the present invention.

Claims

1. A Bluetooth temperature probe, comprising a handle assembly, a circuit board (20), a probe housing (30), a battery (27), an antenna (10) and a probe head (35), characterized in that: The Bluetooth temperature probe (45) is provided with a field-set thermocouple device (25), which is formed by spot welding a constantan spring and a copper-clad sheet of the circuit board (20), wherein the constantan spring abuts against the probe housing (30), and the metal ball formed by the spot welding is the temperature sensing head of the field-set thermocouple device (25), which is used to measure the temperature. The field-set thermocouple device (25) is provided in at least two groups, which are provided according to the different lengths of the circuit board (20). The forward part of the probe head (35) has a flat sharp edge, which gradually narrows and presents a decreasing structure, and is made of ceramic or stainless steel.

2. The Bluetooth temperature probe according to claim 1, characterized in that: The handle assembly comprises: an insulating handle (15), a screw head (5) and a sealing ring (7), wherein the screw head (5) is arranged at the tail of the insulating handle (15), and the sealing ring (7) is arranged between the insulating handle (15) and the screw head (5).

3. The Bluetooth temperature probe according to claim 2, characterized in that: The antenna (10) is arranged inside the insulating handle (15), one end of the antenna (10) is electrically connected to the circuit board (20), and the other end is connected to the screw head (5) to realize signal transmission and reception, and the screw head (5) is also used as a charging electrode.

4. The Bluetooth temperature probe according to claim 1, characterized in that: The circuit board (20) is also provided with a Bluetooth main chip (17) and a digital thermocouple processing chip (22).

5. The Bluetooth temperature probe according to claim 1, characterized in that: The battery (27) is arranged between the circuit board (20) and the probe head (35), and is electrically connected to the circuit board (20).

6. A temperature measuring device, characterized in that: The temperature measuring device comprises a Bluetooth temperature probe (45) according to any one of claims 1 to 5 for temperature measurement.

7. The temperature measuring device according to claim 6, characterized in that: The temperature measurement device also includes a signal transmission charging box (40), wherein a power supply component, a control component and a wireless transmission component are arranged in the signal transmission charging box (40). After receiving the information sent by the Bluetooth temperature probe (45), the wireless transmission component transmits the information to the control component for processing. The information processed by the control component is then sent to the mobile terminal or the cloud through the wireless transmission component.

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