Temperature vibration sensor

Abstract

The utility model relates to a temperature vibration sensor, which comprises an end cover, a sensor circuit board and a shell with a cavity, one end of the shell with the cavity is provided with a thread connected with the end cover, the other end of the shell with the cavity is provided with an installation point, the sensor circuit board is installed inside the cavity, the sensor circuit board is accessed by adopting a POWERBUS two-bus, and the sensor circuit board is connected with the end cover through the POWERBUS two-bus. One path of the POWERBUS two-way bus is converted into a DC power supply through a DC-DC power supply chip and a linear voltage regulator, the DC power supply is used as a power supply of the single-chip microcomputer and peripheral equipment of the single-chip microcomputer, the other path of the POWERBUS two-way bus is converted into a UART signal which can be recognized by the single-chip microcomputer through a POWERBUS two-way bus transceiver and a digital isolator, and the UART signal is input into the single-chip microcomputer. And the NTC thermistor is connected through the analog-to-digital conversion interface. According to the sensor, the low-voltage power supply bus technology of POWERBUS two buses is utilized, so that the communication stability and the communication anti-interference capability are greatly improved.

Description

Technical Field

[0001] The utility model relates to a temperature vibration sensor, belonging to the technical field of motor monitoring. Background Art

[0002] Motor temperature and vibration are two basic parameters during motor operation and are also key indicators for measuring motor health. Excessive motor temperature or vibration will affect the normal operation of the motor and even cause damage to the motor. Motor condition monitoring sensors can monitor the operating status of the motor in real time, promptly identify equipment hazards, prevent equipment failures, and eliminate equipment accidents. The three-axis temperature and vibration intelligent monitoring system achieves preventive maintenance of equipment and improves equipment management level by real-time detection of temperature and vibration speed (characteristic values), two of the most direct, effective, and scientific indicators. Achieving safe and stable operation of motors has always been the goal pursued by equipment managers. Timely measurement of motor temperature and vibration status can detect problems early and take appropriate measures to ensure the normal operation of the motor.

[0003] Motor condition monitoring sensors currently available on the market primarily utilize either wired or wireless transmission methods. Wired transmission utilizes power supply + RS485 bus or network cable. Since most monitored sites contain large vibrating equipment, subject to significant power fluctuations, high noise levels, and numerous interference factors, coaxial power and communication lines are susceptible to interference from noise signals, impacting normal data communication. Wireless transmission utilizes NBIOT, 4G, 5G, Bluetooth, WiFi, LoRa, and other low-power processing methods with built-in batteries. While this method reduces wiring complexity, battery capacity significantly limits data transmission frequency. Multiple devices often need to be monitored within the same site, requiring at least three sensors (base, front-end, and back-end) for each monitored device. Since the cost of a single wireless transmission sensor is significantly higher than that of a wired transmission sensor, project costs can be significantly higher than with wired transmission. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide a temperature vibration sensor, which utilizes the low-voltage power supply bus technology of POWERBUS two buses and replaces the traditional separated control cable and power supply cable by modulating the control signal on the power supply cable, thereby greatly improving the communication stability and communication anti-interference ability.

[0005] The technical solution adopted by this utility model is:

[0006] A temperature vibration sensor includes an end cap, a sensor circuit board, and a housing with a cavity. The housing with the cavity has a thread connected to the end cap at one end and a mounting point at the other end. The sensor circuit board is installed inside the cavity. The sensor circuit board is connected using a POWERBUS two-bus. One POWERBUS two-bus line is converted into a DC power supply for a single-chip microcomputer and its peripheral devices through a DC-DC power supply chip and a linear regulator. The other line is converted into a UART signal recognizable by the single-chip microcomputer through a POWERBUS two-bus transceiver and a digital isolator and input into the single-chip microcomputer. The single-chip microcomputer is connected to a three-axis accelerometer through an SPI interface and to an NTC thermistor through an analog-to-digital conversion interface. The NTC thermistor is placed inside the mounting point.

[0007] The mounting point is a hollow structure protruding outward, with a thread on the outside and an NTC thermistor on the inside. When the sensor is fixed to the monitored device through the external thread, the temperature of the monitored device can be measured more accurately.

[0008] The cavity is in the shape of a regular hexagonal prism, and its inner cross section is a regular hexagon. The length of the sensor circuit board is equal to the longitudinal length of the cavity, and its width is equal to or slightly smaller than the diagonal length of the regular hexagon.

[0009] The outer portion of the housing with the cavity close to the installation point is designed to be in the shape of a regular hexagonal prism.

[0010] The working principle of the present invention is to install an NTC thermistor on the protrusion of the temperature vibration sensor, which is then installed on the device under test via the external thread of the temperature vibration sensor. The single-chip microcomputer regularly collects the voltage value of the NTC thermistor through the analog-to-digital conversion interface, converts it into the NTC resistance value, and then calculates the actual temperature value. In addition, the temperature vibration sensor and the device under test adopt a mechanical connection method of threaded fixing. The single-chip microcomputer collects 1024 X-axis, Y-axis, and Z-axis vibration raw data through the SPI interface, converts them into acceleration signals, and then performs filtering processing to calculate the effective value of acceleration. The calculated temperature and vibration data are stored in the single-chip microcomputer. When an external host device is connected to the temperature vibration sensor via the POWERBUS bus, it can directly power the temperature vibration sensor. At the same time, after receiving the acquisition command from the external host device, the temperature vibration sensor sends the temperature and vibration data to the host device.

[0011] The beneficial effects of the utility model are:

[0012] (1) With the adoption of POWERBUS two-bus technology, only two-core cables are needed to meet the power supply and communication functions, which reduces the cable usage exponentially; by modulating the control signal on the power supply cable, it replaces the traditional separate control cable and power supply cable, greatly improving the communication stability; the POWERBUS two-bus adopts the method of voltage transmission and current signal return, which improves the communication anti-interference ability; at the same time, with the adoption of POWERBUS two-bus technology, the cable can be laid in any way such as bus type, tree type or star type, which greatly facilitates construction wiring, prevents wrong connection, and simplifies construction and maintenance.

[0013] (2) The mounting point adopts a hollow design that protrudes outward. By inserting the NTC thermistor deep into the innermost end of the sensor, when the sensor is fixed to the monitored device through an external thread, the temperature of the monitored device can be measured more accurately.

[0014] (3) The internal design of the cavity adopts a regular hexagonal cross-section. The length of the circuit board is equal to the length inside the cavity, and the width is equal to (slightly less than) the diagonal length of the regular hexagon. This ensures that the circuit board can be installed parallel to one side of the regular hexagonal prism on the outer surface of the cavity, preventing the circuit board from shaking randomly in the wall and avoiding unknown deviations between the axial data obtained by the accelerometer and the marked direction of the shell.

[0015] (4) The utility model is particularly suitable for environments with complex environments, many interference factors, and unstable signal transmission, helping enterprises to achieve stable and comprehensive monitoring of rotating equipment such as motors, fans, water pumps, and bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural sectional view of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the circuit board of the utility model;

[0018] Figure 3 This is a schematic diagram of the circuit of the utility model;

[0019] Figure 4 This is a cross-sectional view of the installation of the utility model;

[0020] Among them, 1. end cap, 2. housing with cavity, 3. sensor circuit board, 4. mounting point, 5. NTC thermistor, 6. thread, 7. cavity, 8. regular hexagonal prism. DETAILED DESCRIPTION

[0021] The following is further described with reference to specific embodiments.

[0022] Embodiment: A temperature vibration sensor, such as Figure 1, including an end cover 1, a sensor circuit board 3 and a housing 2 with a cavity. The housing 2 with a cavity has a thread 6 connected to the end cover 1 at one end and a mounting point 4 at the other end. The sensor circuit board 3 is installed inside the cavity. The sensor circuit board is connected using a POWERBUS two-bus. One path of the POWERBUS two-bus is converted into a DC3.3V power supply for the power supply of the microcontroller and its peripheral devices through a DC-DC power supply chip and a linear regulator (LDO). The other path is converted into a UART signal recognizable by the microcontroller through a POWERBUS two-bus transceiver and a digital isolator and input into the microcontroller. The microcontroller is connected to the three-axis accelerometer through the SPI interface and is connected to the NTC thermistor 5 through the analog-to-digital conversion interface. The NTC thermistor 5 is inside the mounting point.

[0023] The cavity 7 is in the shape of a regular hexagonal prism with a regular hexagonal inner cross section. The sensor circuit board size requirements are that the length is equal to the longitudinal length of the cavity and the width is equal to the diagonal length of the regular hexagon inside the cavity. The NTC thermistor adopts a two-pin direct-plug package and is placed in the middle of the short side of the circuit board. After the 6mm pins of the NTC thermistor are soldered, they are bent outwards of the circuit board to keep the thermistor level with the circuit board. Other components can be designed according to conventional principles. The circuit board size and NTC position are as follows: Figure 2 shown.

[0024] After the POWERBUS bus signal cable is connected to the circuit board, it enters the DC-DC power supply chip and the POWERBUS bus transceiver respectively; the former is converted to a DC5V power supply, and then converted to a DC3.3V power supply through a linear regulator (LDO) for powering the microcontroller and its peripheral devices; the latter is converted to a UART signal recognizable by the microcontroller after being output through a digital isolator. The microcontroller collects the three-axis accelerometer data through the SPI interface and the NTC thermistor voltage value through the analog-to-digital conversion interface, such as Figure 3 shown.

[0025] The working principle of the present invention is to install an NTC thermistor on the protrusion of the temperature vibration sensor, which is then installed on the device under test via the external thread of the temperature vibration sensor. The single-chip microcomputer regularly collects the voltage value of the NTC thermistor through the analog-to-digital conversion interface, converts it into the NTC resistance value, and then calculates the actual temperature value. In addition, the temperature vibration sensor and the device under test adopt a mechanical connection method of threaded fixing. The single-chip microcomputer collects 1024 X-axis, Y-axis, and Z-axis vibration raw data through the SPI interface, converts them into acceleration signals, and then performs filtering processing to calculate the effective value of acceleration. The calculated temperature and vibration data are stored in the single-chip microcomputer. When an external host device is connected to the temperature vibration sensor via the POWERBUS bus, it can directly power the temperature vibration sensor. At the same time, after receiving the acquisition command from the external host device, the temperature vibration sensor sends the temperature and vibration data to the host device.

[0026] The exterior of the housing 2 with the cavity, which is close to the mounting point 4 , is designed to be in the shape of a regular hexagonal prism 8 .

[0027] When installing the sensor circuit board, it should be parallel to one side of the regular hexagonal prism on the outer surface of the housing with the cavity to prevent the circuit board from shaking freely in the cavity and avoid unknown deviations between the axial data obtained by the accelerometer and the marked direction of the housing. The installation cross-sectional diagram is as follows Figure 4 After the sensor circuit board is installed, it is sealed with glue to prevent the internal circuit board from shaking due to vibration during the use of the sensor, which may cause large data measurement errors. It can also play a role in dust and water prevention.

[0028] This product is particularly suitable for environments with complex environments, many interference factors, and unstable signal transmission, helping enterprises to achieve stable and comprehensive monitoring of rotating equipment such as motors, fans, water pumps, and bearings.

[0029] The above is a detailed introduction of the present invention in combination with specific embodiments, and the protection scope of the present invention is not limited thereto.

Claims

1. A temperature vibration sensor, comprising an end cap, a sensor circuit board and a housing with a cavity, characterized in that: One end of the shell with a cavity has a thread connected to the end cover and the other end has a mounting point. The sensor circuit board is installed inside the cavity. The sensor circuit board is connected using a POWERBUS two-bus. One path of the POWERBUS two-bus is converted into a DC power supply for the microcontroller and its peripheral devices through a DC-DC power supply chip and a linear regulator. The other path is converted into a UART signal recognizable by the microcontroller through a POWERBUS two-bus transceiver and a digital isolator and input into the microcontroller. The microcontroller is connected to the three-axis accelerometer through the SPI interface and is connected to the NTC thermistor through the analog-to-digital conversion interface. The NTC thermistor is placed inside the mounting point.

2. A temperature vibration sensor according to claim 1, characterized in that: The mounting point is a hollow structure protruding outward, with a thread on the outside and an NTC thermistor inside.

3. A temperature vibration sensor according to claim 1, characterized in that: The cavity is in the shape of a regular hexagonal prism, and its inner cross section is a regular hexagon. The length of the sensor circuit board is equal to the longitudinal length of the cavity, and its width is equal to or slightly smaller than the diagonal length of the regular hexagon.

4. A temperature vibration sensor according to claim 1, characterized in that: The outer portion of the housing with the cavity close to the installation point is designed to be in the shape of a regular hexagonal prism.

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