Vacuum low-temperature multi-point wireless temperature probe

Abstract

The invention, which belongs to the technical field of the wireless temperature probe, discloses a vacuum low-temperature multi-point wireless temperature probe comprising a mounting box, a magnetic connector female head, a magnetic connector male head, a temperature detection assembly, an integrated control panel and a power supply assembly. A square notch is formed in one end of the mounting box, a placement groove is formed in one end of the square notch, a first mounting groove is formed in the front end of the mounting box, and a second mounting groove is formed in the rear end of the mounting box; the magnetic suction connector female head is inserted in the square notch, the pin connecting end of the magnetic suction connector female head is connected with the transmission line with the shielding layer in a welding mode, the magnetic suction connector male head is fixedly installed in the containing groove, extra wiring is not needed, the influence on the internal vacuum degree is reduced, the safety of a vacuum low-temperature experiment is improved, and personal errors are reduced. And meanwhile, the wiring is reduced by more than 70%, the accuracy is improved to + / -0.1 DEG C, the multi-point synchronous delay is reduced, the temperatures of different positions in a short distance can be measured at the same time, and the device is suitable for equipment such as 0-100kPa vacuum freeze dryers and the like.

Description

Technical Field

[0001] This invention relates to multi-point wireless temperature probes, specifically vacuum low-temperature multi-point wireless temperature probes, and belongs to the field of wireless temperature probe technology. Background Technology

[0002] Vacuum cryogenic equipment (such as freeze dryers) contains several key areas, including partitions, materials, condensers, and vacuum chambers. The freeze drying process has extremely high requirements for temperature accuracy, and temperature differences at various locations directly affect the freeze drying effect. For example, the freezing and sublimation rates of materials require simultaneous monitoring at multiple points.

[0003] As described in the announcement number CN216899326U, an integrated temperature monitoring probe includes: an integrated metal sleeve, a temperature monitoring chip, a thermal transmission wire, an external wire, a shaped metal protective tube, and an insulating sleeve. The integrated metal sleeve has a closed probe end and an open connection end; one end of the thermal transmission wire is connected to the temperature monitoring chip, and the other end is connected to the external wire, forming a junction; the temperature monitoring chip is housed within the closed probe end of the integrated metal sleeve, and the thermal transmission wire is partially housed within the integrated metal sleeve; the junction is located outside the integrated metal sleeve; the insulating sleeve is fitted onto the junction; the shaped metal protective tube is fitted onto the insulating sleeve; and one end of the shaped metal protective tube is pressed against the open connection end of the integrated metal sleeve, while the other end is pressed against the external wire. This integrated temperature monitoring probe, as disclosed in this utility model, prevents moisture from the air from entering the temperature monitoring probe, extending its service life and improving product stability and safety.

[0004] In existing technologies, vacuum cryogenic equipment (such as freeze dryers) often uses wired temperature probes to measure temperature at multiple locations. However, wired probes are easily limited by vacuum sealing, resulting in complex wiring, significant signal interference, and in low-temperature environments (-100℃), cable heat conduction affects measurement accuracy, with errors often exceeding ±0.5℃. Although wireless probes have seen some initial applications, they are mostly limited to room temperature and are difficult to adapt to vacuum insulation and low-temperature radiation environments. They also have short battery life, poor multi-point synchronization, and accuracy less than ±0.5℃, failing to meet the stringent requirements of the pharmaceutical or scientific research fields. Summary of the Invention

[0005] The purpose of this invention is to provide a vacuum low-temperature multi-point wireless temperature probe to solve the above-mentioned problems, which can overcome the shortcomings of existing wireless temperature probes in vacuum low-temperature environments, such as low accuracy, difficulty in multi-point synchronization, short battery life, and large wiring interference.

[0006] The present invention achieves the above objectives through the following technical solution: a vacuum low-temperature multi-point wireless temperature probe, comprising a mounting box, a female magnetic connector, a male magnetic connector, a temperature detection component, an integrated control panel, and a power supply component; The mounting box has a square notch at one end, a placement groove at one end of the square notch, a first mounting groove at the front end of the mounting box, and a second mounting groove at the rear end of the mounting box. The female magnetic connector is inserted into the square notch, and the pins of the female magnetic connector are connected to a shielded transmission line by soldering. The male magnetic connector is fixedly installed in the placement slot. The temperature detection component includes: The temperature probe node is electrically connected to the transmission line; The temperature detection chip is packaged in a linear array inside one end of the temperature probe node; The integrated control panel is fixedly installed in the first mounting slot. One end of the integrated control panel is provided with a Bluetooth Low Energy chip, which is used to send a periodic sampling trigger signal to the temperature detection chip. The power supply component includes: A battery box is fixedly installed in the second mounting slot, and one end of the battery box is electrically connected to the integrated control panel; The dry cell battery is electrically connected to the battery box via a positive conductive plate and a negative conductive spring.

[0007] Preferably, in order to improve the service life of the mounting box, the mounting box is made of polytetrafluoroethylene (PTFE) to adapt to the low temperature and high vacuum environment inside the vacuum cryogenic equipment.

[0008] Preferably, in order for the temperature probe node to function properly, the temperature probe node is made of FPC, and the temperature probe node has a length of 16mm and a width of 6mm.

[0009] Preferably, in order to detect multiple temperatures, the temperature detection chips are arranged at equal intervals, and there are 1 to 3 temperature detection chips.

[0010] Preferably, the Bluetooth Low Energy chip is electrically connected to the temperature detection chip in order to send a periodic sampling trigger signal to the temperature detection chip.

[0011] Preferably, in order to protect the dry cell battery and the integrated control panel, a sealing plate is detachably installed at one end of both the first mounting slot and the second mounting slot via positioning screws, and the sealing plate is made of polytetrafluoroethylene.

[0012] Preferably, in order to improve the service life of the temperature probe node, one end of the temperature probe node is provided with an IP68-level sealing structure. The IP68-level sealing structure uses a low-temperature resistant sealing material, which can withstand high vacuum environment and low temperature impact, and prevent external media from entering.

[0013] Preferably, for ease of testing, one end of the temperature probe node is provided with a high borosilicate glass container, and the one end of the temperature probe node extends through the rubber stopper of the high borosilicate glass container into the high borosilicate glass container.

[0014] The beneficial effects of this invention are: 1. When measuring the temperature inside a vacuum environment cavity, no additional wiring is required, which reduces the impact on the internal vacuum level, improves the safety of low-temperature vacuum experiments from 0 to -100 kPa, reduces human error, and reduces wiring by more than 70%, thus promoting green monitoring.

[0015] 2. By integrating the temperature detection chip into the temperature probe node, the accuracy is improved to ±0.1℃, reducing multi-point synchronization delay. It can simultaneously measure the temperature at different locations at close range, and is suitable for equipment such as vacuum freeze dryers from 0 to -100kPa.

[0016] 3. It allows for flexible configuration of temperature sensors, enabling the addition or removal of the number of temperature sensors, simplifying connections, and reducing maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the transmission line connection structure of the present invention.

[0019] Figure 3 This is a cross-sectional view of the high borosilicate glass placement bottle of the present invention.

[0020] Figure 4 This is a schematic diagram of the temperature detection component of the present invention.

[0021] Figure 5 This is a schematic diagram of the integrated control panel structure of the present invention.

[0022] Figure 6 This is a schematic diagram of the square notch structure of the present invention.

[0023] Figure 7 This is a schematic diagram of the male connector connection structure of the magnetic connector of the present invention.

[0024] Figure 8 This is a schematic diagram of the battery box connection structure of the present invention.

[0025] Figure 9 This is a schematic diagram illustrating the temperature detection component of the present invention measuring temperature changes.

[0026] In the diagram: 1. Mounting box; 2. Magnetic connector female; 3. Magnetic connector male; 4. Temperature detection assembly; 401. Temperature probe node; 402. Temperature detection chip; 5. Integrated control panel; 6. Battery box; 7. Square notch; 8. Placement slot; 9. First mounting slot; 10. Second mounting slot; 11. Transmission line; 12. Positioning screw; 13. Sealing plate; 14. High borosilicate glass placement bottle; 15. Rubber stopper; 16. Dry cell battery. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1-8 As shown, the vacuum low-temperature multi-point wireless temperature probe includes a mounting box 1, a magnetic connector female 2, a magnetic connector male 3, a temperature detection component 4, an integrated control panel 5, and a power supply component. One end of the mounting box 1 has a square notch 7, and the other end of the square notch 7 has a placement groove 8. The front end of the mounting box 1 has a first mounting groove 9, and the rear end of the mounting box 1 has a second mounting groove 10. The mounting box 1 is made of polytetrafluoroethylene and is used to adapt to the low temperature and high vacuum environment inside the vacuum cryogenic equipment. The female magnetic connector 2 is inserted into the square notch 7. The pins of the female magnetic connector 2 are connected to the shielded transmission line 11 by soldering. The male magnetic connector 3 is fixedly installed in the placement slot 8. The female magnetic connector 2 and the male magnetic connector 3 in the placement slot 8 achieve precise docking through the attraction force of opposite magnets. The magnetic connection design not only ensures that the contact resistance between the male and female connectors is ≤50mΩ, ensuring low-loss transmission of electrical signals, but also enables quick disassembly and assembly, facilitating later maintenance.

[0029] like Figure 3 and Figure 4 As shown, the temperature detection component 4 includes: Temperature probe node 401 is electrically connected to transmission line 11. Temperature probe node 401 is made of FPC. Temperature probe node 401 is 16mm long and 6mm wide. One end of temperature probe node 401 is equipped with an IP68-level sealing structure. The IP68-level sealing structure uses low-temperature resistant sealing material, which can withstand high vacuum environment and low temperature impact, and prevent external media from entering. A high borosilicate glass bottle 14 is provided at one end of the temperature probe node 401, and the rubber stopper 15 of the high borosilicate glass bottle 14 extends through the rubber stopper 15 of the high borosilicate glass bottle 14 into the high borosilicate glass bottle 14.

[0030] Temperature detection chips 402 are linearly arrayed and packaged inside one end of temperature probe node 401. Temperature detection chips 402 are arranged at equal intervals, and there are 1 to 3 temperature detection chips 402. The integrated control panel 5 is fixedly installed in the first mounting slot 9. One end of the integrated control panel 5 is equipped with a Bluetooth Low Energy chip, used to send periodic sampling trigger signals to the temperature detection chip 402. The Bluetooth Low Energy chip is electrically connected to the temperature detection chip 402. A sealing plate 13 is detachably installed at one end of both the first mounting slot 9 and the second mounting slot 10 via positioning screws 12. The sealing plate 13 is made of polytetrafluoroethylene (PTFE). During use, the Bluetooth Low Energy chip supports multiple Bluetooth LE protocols to achieve reliable transmission distance. The central receiver (based on a Raspberry Pi integrated Bluetooth gateway) is an existing device, acting as the master device, connecting and managing up to eight slave nodes simultaneously, aggregating multi-point data in real time, and supporting BLE. The system features GATT protocol output and an optional relay expansion module for extended network coverage. It supports further unlimited node expansion in a mesh topology. During use, the integrated control panel 5 is fixed in the first mounting slot 9 at the front of the mounting box 1. Its built-in Bluetooth Low Energy chip serves as the core control unit, boasting low power consumption, anti-interference capabilities, and stable transmission. It is compatible with the long-term power requirements of dry cell batteries 16, avoiding frequent battery replacements. The Bluetooth Low Energy chip has a built-in programmable sampling period module, allowing users to preset sampling intervals from 1 to 60 seconds according to monitoring needs, meeting the temperature monitoring frequency requirements of different freeze-drying processes. The Bluetooth Low Energy chip and temperature detection chip 402 establish a communication link through electrical connection. Trigger signals are accurately transmitted through a shielded transmission line 11. The outer shield of the transmission line 11 effectively isolates electromagnetic interference that may exist in a vacuum environment and reduces signal attenuation during transmission, ensuring that the trigger command is transmitted to the temperature probe node 401 without delay or distortion. When the preset sampling time point is reached, the Bluetooth Low Energy chip generates and sends a synchronous sampling trigger signal, instructing all temperature detection chips 402 to start detection simultaneously, avoiding synchronization delays caused by time differences in multi-point measurements.

[0031] One end of the temperature probe node 401 is equipped with an IP68-level sealing structure. This structure adopts a combination design of low-temperature resistant fluororubber sealing ring and laser welding encapsulation process. After sealing, the temperature probe node 401 extends through the rubber stopper 15 of the high borosilicate glass bottle 14 into the bottle. The high borosilicate glass material is resistant to low-temperature impact, has strong chemical stability, and is transparent and visible. The 1 to 3 temperature detection chips 402 inside the temperature probe node 401 are arranged linearly and equally spaced to form a multi-point detection array, which can simultaneously cover the temperature monitoring needs of different locations at close range. After receiving the synchronous sampling trigger signal, the temperature detection chip 402 can quickly sense the physical temperature of its location and convert the temperature signal into a standard digital electrical signal to ensure the accuracy and real-time performance of the temperature data.

[0032] like Figure 8 As shown, the power supply components include: The battery box 6 is fixedly installed in the second mounting slot 10, and one end of the battery box 6 is electrically connected to the integrated control panel 5. The dry cell battery 16 is electrically connected to the battery box 6 through the positive conductive plate and the negative conductive spring. In use, the power supply component serves as the core of the system's power. Through structural design and sealed protection, it ensures continuous power supply in a vacuum and low-temperature environment. The low-temperature resistant dry cell battery 16 is selected as the power source. It forms a tight electrical connection with the positive conductive plate and the negative conductive spring inside the battery box 6. The battery box 6 is fixedly installed in the second mounting slot 10 at the rear of the mounting box 1, forming an electrical path with the integrated control panel 5, and stably transmitting electrical energy to the control unit and the temperature detection component 4. The mounting box 1 and the matching sealing plate 13 are both made of polytetrafluoroethylene (PTFE). This material has the adaptability to low temperature and high vacuum, and has extremely strong chemical stability, so it will not release volatile substances to contaminate the cavity in a vacuum and low-temperature environment. The sealing plate 13 can be detachably installed at one end of the first mounting groove 9 and the second mounting groove 10 through the positioning screw 12 with sealing gasket. The sealing gasket fills the gap between the first mounting groove 9, the second mounting groove 10 and the sealing plate 13 to form a sealing structure, which not only prevents the intrusion of external low temperature medium, water vapor or dust, but also resists the pressure impact of high vacuum environment on internal components, ensuring the stable operation of power supply components and integrated control panel 5.

[0033] Working Principle: The entire device is placed on a partition inside a 0 to -100 kPa freeze dryer, with the partition temperature set to -20℃. Three temperature detection chips 402 are installed, and the central receiver is connected upon startup. After startup, the system uniformly schedules data acquisition. Temperature probe node 401 collects data periodically. The digital electrical signal converted by the temperature detection chip 402 is transmitted in reverse through a shielded transmission line 11 to the integrated control panel 5. After the electrical signal reaches the integrated control panel 5, it is processed by the built-in signal amplification and filtering module. The amplification module amplifies the weak digital electrical signal to a range that the Bluetooth Low Energy chip can recognize, while the filtering module filters out noise interference in the signal, further improving data accuracy. Subsequently, the Bluetooth Low Energy chip converts the processed temperature data into a Bluetooth wireless signal. This signal has a transmission distance of ≤10m and can penetrate the cavity wall of the vacuum freeze dryer to achieve wireless transmission. No additional wiring is required inside the vacuum cavity, which avoids the problems of damaging the cavity's sealing and affecting the vacuum level during wiring, and reduces the wiring workload by more than 70%, achieving green monitoring. After receiving wireless temperature data, the external central receiver can display and record the temperature changes at each monitoring point in real time, providing data support for freeze-drying process optimization and quality traceability. The experimentally measured data is the real-time temperature of the liquid inside the freeze dryer on the -25°C partition. Users can increase or decrease the number of temperature detection chips 402 (1 to 3) according to monitoring needs. The low-power design of the Bluetooth Low Energy chip combined with the long-lasting power supply of dry batteries further enhances the system's battery life, meeting the needs of long-term continuous monitoring.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A vacuum low-temperature multi-point wireless temperature probe, characterized in that: It includes a mounting box (1), a female magnetic connector (2), a male magnetic connector (3), a temperature sensing assembly (4), an integrated control panel (5), and a power supply assembly; The mounting box (1) has a square notch (7) at one end, a placement groove (8) at one end of the square notch (7), a first mounting groove (9) at the front end of the mounting box (1), and a second mounting groove (10) at the rear end of the mounting box (1). The female magnetic connector (2) is inserted into the square notch (7), and the pin connection end of the female magnetic connector (2) is connected to a transmission line (11) with a shielded layer by welding. The male magnetic connector (3) is fixedly installed in the placement slot (8). The temperature detection component (4) includes: Temperature probe node (401) is electrically connected to the transmission line (11); The temperature detection chip (402) is linearly arrayed and packaged inside one end of the temperature probe node (401); The integrated control panel (5) is fixedly installed in the first mounting slot (9). One end of the integrated control panel (5) is provided with a Bluetooth low power chip, which is used to send a periodic sampling trigger signal to the temperature detection chip (402). The power supply component includes: The battery box (6) is fixedly installed in the second mounting slot (10), and one end of the battery box (6) is electrically connected to the integrated control panel (5); The dry cell (16) is electrically connected to the battery box (6) through the positive conductive plate and the negative conductive spring.

2. The vacuum cryogenic multi-point wireless temperature probe according to claim 1, characterized in that: The mounting box (1) is made of polytetrafluoroethylene and is used to adapt to the low temperature and high vacuum environment inside the vacuum cryogenic equipment.

3. The vacuum cryogenic multi-point wireless temperature probe according to claim 1, characterized in that: The temperature probe node (401) is made of FPC, and the temperature probe node (401) is 16mm long and 6mm wide.

4. The vacuum cryogenic multi-point wireless temperature probe according to claim 1, characterized in that: The temperature detection chips (402) are arranged at equal intervals, and there are 1 to 3 temperature detection chips (402).

5. The vacuum cryogenic multi-point wireless temperature probe according to claim 1, characterized in that: The Bluetooth Low Energy chip is electrically connected to the temperature detection chip (402).

6. The vacuum cryogenic multi-point wireless temperature probe according to claim 1, characterized in that: Both the first mounting groove (9) and the second mounting groove (10) have a sealing plate (13) that can be detachably installed at one end by a positioning screw (12). The sealing plate (13) is made of polytetrafluoroethylene.

7. The vacuum cryogenic multi-point wireless temperature probe according to claim 1, characterized in that: One end of the temperature probe node (401) is provided with an IP68-level sealing structure. The IP68-level sealing structure uses low-temperature resistant sealing material, which can withstand high vacuum environment and low temperature impact, and prevent external media from entering.

8. The vacuum cryogenic multi-point wireless temperature probe according to claim 1, characterized in that: One end of the temperature probe node (401) is provided with a borosilicate glass bottle (14), and the rubber stopper (15) of the temperature probe node (401) extends through the borosilicate glass bottle (14) into the borosilicate glass bottle (14).

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