Wired temperature measurement sensor

Abstract

The utility model relates to a wired temperature measurement sensor, which comprises a main case, a telescopic spool and a touch screen, a main control board is arranged in the main case, and a thermocouple electrode probe electrically connected with the main control board is mounted at the bottom end of the telescopic spool. An acquisition circuit module, a conditioning amplification module, a single-chip microcomputer, an output circuit and a power supply conversion module are integrated on the main control board, the thermocouple electrode probe is connected with the input end of the single-chip microcomputer through the acquisition circuit module and the conditioning amplification module in sequence, the output circuit is connected with the output end of the single-chip microcomputer, the single-chip microcomputer is connected with the touch screen in series, and the power supply conversion module is connected with the power supply conversion module. The power supply conversion module supplies power to the acquisition circuit module, the single-chip microcomputer, the output circuit and the touch screen, and the conditioning amplification module takes power from the single-chip microcomputer. According to the wired temperature measurement sensor, a series of processing such as amplification, conditioning and filtering are carried out on collected signals, the signals are kept stable in all temperature areas, meanwhile, the probe rod part is designed, and invasion of acid and alkali solutions is isolated.

Description

Technical Field

[0001] The utility model relates to the field of measurement technologies and devices, and particularly relates to a wired temperature sensor. Background Art

[0002] Industrial temperature sensors are mainly used for temperature measurement of large equipment such as machining machine tools, parts, chemical tanks, reaction pools, energy transmission and storage, etc., and are generally fixed on the equipment to be measured for continuous signal acquisition and transmission. Existing industrial temperature sensors have insufficient signal accuracy in the low-temperature and high-temperature regions due to their large measurement ranges, and are prone to drift and interference. At the same time, when applied to the chemical and energy fields, the probe needs to be immersed in acidic or alkaline solutions, so the probe rod and probe are easily corroded, and the vaporized solution is also likely to penetrate into the contact circuit board, affecting the operation of the instrument and even causing damage to the instrument. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the defects of unstable signals in the high- and low-temperature regions of existing industrial temperature sensors and the easy corrosion of instruments when applied in the chemical and energy fields, and provide a wired temperature sensor. Through a series of processes such as amplifying, conditioning, and filtering the collected signals, the signals are kept stable in each temperature region. At the same time, the probe rod part is designed to isolate the intrusion of acidic and alkaline solutions, and the probe rod with a telescopic structure can be adjusted in length, which is convenient for adjusting the area to be collected or the liquid level depth, and is widely applicable to industrial equipment applications in the chemical and energy fields.

[0004] The wired temperature sensor includes a main housing, a telescopic wire tube connected below the main housing, and a touch screen installed on the front of the main housing. A main control board is provided inside the main housing. A thermocouple electrode probe electrically connected to the main control board is installed at the bottom end of the telescopic wire tube. Among them, a signal acquisition circuit module, a conditioning and amplification module, a single-chip microcomputer, an output circuit, and a power conversion module are integrated on the main control board. The thermocouple electrode probe is connected to the input end of the single-chip microcomputer through the signal acquisition circuit module and the conditioning and amplification module in sequence. The output circuit is connected to the output end of the single-chip microcomputer. The single-chip microcomputer is serially connected to the touch screen. The power conversion module supplies power to the signal acquisition circuit module, the single-chip microcomputer, the output circuit, and the touch screen. The conditioning and amplification module obtains power from the single-chip microcomputer.

[0005] Optimally, a protection interface is provided on the side of the main housing. The outgoing line of the output circuit and the incoming line of the power conversion module are led out through the protection interface. A tapered wire fixing sleeve is screwed onto the protection interface, and a plurality of notch grooves for inward contraction of the interface are opened in the threaded part area at the edge of the protection interface.

[0006] Optimized, the telescopic wire tube includes a connection head, a basic wire tube fixed on the connection head, and a movable sleeve sleeved outside the basic wire tube. The thermocouple electrode probe is fixed at the lower end of the movable sleeve. The elongation and shortening of the telescopic wire tube are realized by stretching the movable sleeve to determine the temperature measurement depth. A wire-winding column is provided in the center of the basic wire tube, and the wire between the main control board and the thermocouple electrode probe is wound around the wire-winding column. Both the basic wire tube and the movable sleeve are made of 316 molybdenum-containing alloy profiles. Among them, FKM fluororubber filler is filled inside the lower end of the movable sleeve around the periphery of the thermocouple electrode probe, and an HNBR hydrogenated nitrile rubber corrugated seal tube is provided between the basic wire tube and the movable sleeve.

[0007] Specifically, the single-chip microcomputer uses the STM32F105R microprocessor integrated with an AD conversion module. In addition to the control function of other functional modules based on the processor, it can directly perform analog-to-digital conversion on the input signal. The acquisition circuit module uses the MAX6675 acquisition module, the conditioning and amplification module uses the ADA4470 signal processing module, and the output circuit uses the XTR111 voltage signal to 4-20mA current signal module. The MAX6675 acquisition module can match the K-type thermocouple to collect and convert the potential difference. The ADA4470 signal processing module can not only perform stable conditioning functions, but also perform signal amplification and filtering processing at the front and rear stages of the conditioning circuit respectively.

[0008] A wired temperature sensor of the present invention overcomes the defects of unstable signals in high and low temperature regions and easy corrosion of instruments in the application of the chemical and energy fields existing in existing industrial temperature sensors. Through a series of processes such as amplifying, conditioning, and filtering the collected signals, the signals are kept stable in each temperature region. At the same time, the probe part is designed to isolate the intrusion of acid-base solutions. The length of the telescopic probe can be adjusted, which is convenient for adjusting the area to be collected or the liquid level depth, and is widely applicable to industrial equipment applications in the chemical and energy fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The following further describes a wired temperature sensor of the present invention with reference to the drawings:

[0010] Figure 1 is the schematic plan view of the wired temperature sensor;

[0011] Figure 2 is Figure 1 the exploded view of

[0012] Figure 3 is Figure 2 the partial enlarged view of part A in

[0013] Figure 4 the logic structure and connection principle block diagram of the wired temperature sensor.

[0014] In the figure:

[0015] 1 - Main housing; 11 - Protection interface, 12 - Cable fixing collar; 111 - Notch groove;

[0016] 2 - Telescopic wire tube; 21 - Connector head, 22 - Basic wire tube, 23 - Movable sleeve, 24 - Filler, 25 - Corrugated seal tube; 221 - Wire winding post;

[0017] 3 - Touch screen;

[0018] 4 - Main control board; 41 - Acquisition circuit module, 42 - Conditioning and amplification module, 43 - Single-chip microcomputer, 44 - Output circuit, 45 - Power conversion module;

[0019] 5 - Thermocouple electrode probe. Specific embodiments

[0020] In the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0021] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "left", "right", "front", "rear", "top", "bottom", "inside", "outside", etc. are all based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model 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 should not be construed as a limitation to the present utility model.

[0022] The following uses specific embodiments to further describe the technical solutions of the present utility model, but the protection scope of the present utility model is not limited to the following embodiments.

[0023] Embodiment 1: As Figures 1 to 4As shown in the figure, this wired temperature sensor includes a main housing 1, a telescopic wire tube 2 connected below the main housing 1, and a touch screen 3 installed on the front of the main housing 1. A main control board 4 is provided inside the main housing 1. A thermocouple electrode probe 5 electrically connected to the main control board 4 is installed at the bottom end of the telescopic wire tube 2. Among them, a collection circuit module 41, a conditioning and amplification module 42, a single-chip microcomputer 43, an output circuit 44, and a power conversion module 45 are integrated on the main control board 4. The thermocouple electrode probe 5 is connected to the input end of the single-chip microcomputer 43 through the collection circuit module 41 and the conditioning and amplification module 42 in sequence. The output circuit 44 is connected to the output end of the single-chip microcomputer 43. The single-chip microcomputer 43 is serially connected to the touch screen 3. The power conversion module 45 supplies power to the collection circuit module 41, the single-chip microcomputer 43, the output circuit 44, and the touch screen 3. The conditioning and amplification module 42 draws power from the single-chip microcomputer 43.

[0024] Embodiment 2: A protection interface 11 is provided on the side of the main housing 1 of this wired temperature sensor. The outgoing line of the output circuit 44 and the incoming line of the power conversion module 45 are led out through the protection interface 11. A tapered wire fixing sleeve 12 is screwed onto the protection interface 11. A number of notch grooves 111 for inward contraction of the interface are opened in the threaded part area at the edge of the protection interface 11. After the wiring is led out, by screwing the wire fixing sleeve into the protection interface, the tapered wire fixing sleeve gradually presses the threaded part at the edge of the protection interface to contract inward, clamping the wire to play a role in preventing backward movement, thereby preventing the wire from being dragged by external force and detaching from the soldering connection of the main control board. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0025] Embodiment 3: The telescopic wire tube 2 of this wired temperature sensor includes a connection head 21, a basic wire tube 22 fixed on the connection head 21, and a movable sleeve 23 sleeved outside the basic wire tube 22. The thermocouple electrode probe 5 is fixed at the lower end of the movable sleeve 23. The elongation and shortening of the telescopic wire tube are realized by stretching the movable sleeve to determine the temperature measurement depth. A winding column 221 is provided in the center of the basic wire tube 22. The wire between the main control board 4 and the thermocouple electrode probe 5 is wound around this winding column 221. This prevents the wire from being damaged by straight bending during the telescopic process of the movable sleeve. Both the basic wire tube 22 and the movable sleeve 23 are made of 316 molybdenum-containing alloy profiles. Among them, FKM fluororubber filler 24 is filled in the lower end inside the movable sleeve 23 around the thermocouple electrode probe 5. An HNBR hydrogenated nitrile rubber corrugated sealing tube 25 is provided between the basic wire tube 22 and the movable sleeve 23. This is used to achieve corrosion resistance of the overall material of the telescopic wire tube and water sealing of the tube cavity, preventing the electrolyte from entering the wire tube to corrode the electrical wire and the circuit board in the upper main housing. The corrugated sealing tube also provides damping for positioning the movable sleeve after stretching. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0026] Embodiment 4: In this wired temperature sensor, the single-chip microcomputer 43 uses the STM32F105R microprocessor integrated with an AD conversion module. In addition to the control function for other functional modules based on the processor, it can directly perform analog-to-digital conversion on the input signals. The acquisition circuit module 41 uses the MAX6675 acquisition module, the conditioning and amplification module 42 uses the ADA4470 signal processing module, and the output circuit 44 uses the XTR111 voltage signal to 4 - 20mA current signal module. The MAX6675 acquisition module can match the K-type thermocouple to collect and convert the potential difference. The ADA4470 signal processing module can not only perform stable conditioning functions, but also perform signal amplification and filtering processing on the front and rear stages of the conditioning circuit respectively. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0027] During operation: The acquisition circuit module provides a detection voltage to the thermocouple electrode probe, collects the electromotive force change at two points on the thermocouple electrode probe, and outputs a weak current signal. The signal is processed by the conditioning and amplification module and the filtering module and then sent to the single-chip microcomputer for AD conversion. The output digital signal is displayed on the touch screen through one path, and is converted into a stable 4 - 20mA analog signal through the output module and connected to an instrument or other devices. The touch screen can set parameters such as acquisition timing and acquisition frequency for the single-chip microcomputer.

[0028] A wired temperature sensor of the present utility model overcomes the defects existing in existing industrial temperature sensors, such as unstable signals in high and low temperature regions and easy corrosion of instruments when applied in the chemical and energy fields. Through a series of processes such as amplifying, conditioning, and filtering the acquired signals, the signals are kept stable in each temperature region. At the same time, the probe part is designed to isolate the intrusion of acid-base solutions. The length of the telescopic probe can be adjusted, which is convenient for adjusting the area to be measured or the liquid level depth, and is widely applicable to industrial equipment applications in the chemical and energy fields.

[0029] The above description shows the main features, basic principles, and advantages of the present utility model. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments or examples, and can be implemented in other specific forms without departing from the spirit or basic features of the present utility model. Therefore, the above embodiments or examples should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0030] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard 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 wired temperature sensor, characterized in that: The invention comprises a main housing (1), a telescopic wire tube (2) connected to the bottom of the main housing (1), and a touch screen (3) installed on the front of the main housing (1); a main control board (4) is arranged in the main housing (1); a thermocouple electrode probe (5) electrically connected to the main control board (4) is installed at the bottom end of the telescopic wire tube (2), wherein: The main control board (4) is integrated with a collection circuit module (41), a conditioning and amplification module (42), a single-chip computer (43), an output circuit (44) and a power conversion module (45); the thermocouple electrode probe (5) is connected to the input end of the single-chip computer (43) via the collection circuit module (41) and the conditioning and amplification module (42) in sequence; the output circuit (44) is connected to the output end of the single-chip computer (43); the single-chip computer (43) is serially connected to the touch screen (3); the power conversion module (45) supplies power to the collection circuit module (41), the single-chip computer (43), the output circuit (44) and the touch screen (3); and the conditioning and amplification module (42) draws power from the single-chip computer (43).

2. The wired temperature sensor according to claim 1, characterized in that: The main housing (1) is provided with a protection interface (11) on the side, and the output line of the output circuit (44) and the input line of the power conversion module (45) are led out through the protection interface (11). A cone-shaped fixed wire ring (12) is threadedly connected to the protection interface (11), and a plurality of notched grooves (111) for inward retraction of the interface are opened in the edge thread area of ​​the protection interface (11).

3. The wired temperature sensor according to claim 2, characterized in that: The telescopic wire tube (2) comprises a joint portion (21), a basic wire tube (22) fixed on the joint portion (21), and a movable sleeve (23) sleeved outside the basic wire tube (22); the thermocouple electrode probe (5) is fixed at the lower end of the movable sleeve (23); the telescopic wire tube is extended and shortened by stretching the movable sleeve to determine the temperature measurement depth; a winding column (221) is provided in the center of the basic wire tube (22), and the wire between the main control board (4) and the thermocouple electrode probe (5) is wound on the winding column (221); the basic wire tube (22) and the movable sleeve (23) are both made of 316 molybdenum-containing alloy profiles, wherein the lower end of the movable sleeve (23) is filled with FKM fluororubber filler (24) at the outer periphery of the thermocouple electrode probe (5), and an HNBR hydrogenated nitrile rubber corrugated sealing tube (25) is provided between the basic wire tube (22) and the movable sleeve (23).

4. The wired temperature sensor according to claim 3, characterized in that: The single chip computer (43) adopts an STM32F105R microprocessor integrated with an AD conversion module; the acquisition circuit module (41) adopts a MAX6675 acquisition module, the conditioning and amplification module (42) adopts an ADA4470 signal processing module, and the output circuit (44) adopts an XTR111 voltage signal to 4-20mA current signal module.

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