Electric constant-temperature tilt angle sensor

Abstract

The invention relates to the technical field of tilt angle sensors, in particular to an electric constant-temperature tilt angle sensor which comprises a metal shell, a cooling fin, a tilt angle sensor PCB, a semiconductor cooler, a constant-temperature control board PCB and a cooling fan. The tilt angle sensor is cooled, when the temperature of the tilt angle sensor is too low, the tilt angle sensor is heated, and meanwhile, an active cooling fan is used for cooling a radiator of a semiconductor cooler, so that the electric constant-temperature tilt angle sensor can always work at the optimal temperature, and the electric constant-temperature tilt angle sensor is compact in structure, easy to implement on an engineering site and high in practicability. The technical problems that the working temperature of an existing electric constant-temperature tilt angle sensor is not the zero drift temperature calibrated when leaving a factory, certain limitation exists, the internal structure is not compact enough, and on-site implementation is not facilitated are solved.

Description

Technical Field

[0001] The invention relates to the technical field of inclination sensors, and in particular to an electric constant temperature inclination sensor. Background Art

[0002] Tilt sensors are widely used in robot joint angle sensing, aircraft attitude control, and high-rise building and tower health monitoring. However, when the ambient temperature changes, the internal mass block of the tilt sensor expands and contracts due to heat and cold, causing changes in the pressure on the side wall, thereby affecting the accuracy of tilt detection. The traditional use of temperature compensation algorithms requires complex mathematical models and calibration processes, and the final result is a fitting result with a certain deviation. When the temperature is high, the thermal noise will also increase significantly, resulting in excessive sensor output jitter. It can be seen that whether the tilt sensor is used directly or an algorithm is used to compensate for the temperature, the operating temperature of the sensor is not the zero drift temperature calibrated at the factory, which has certain limitations, such as the prior art CN202734816U.

[0003] There are also examples of using semiconductor refrigerators to control temperature, but there is no cooling fan for active heat dissipation, so there is no air inlet and outlet, the heat dissipation effect is poor, the constant temperature effect is not ideal, and the internal structure is not compact enough, which is not conducive to on-site implementation, such as the prior art CN113985946A and CN210513115U.

[0004] Semiconductor refrigerators use the Peltier effect to achieve cooling and heating. When current flows from P-type material to N-type material, electrons absorb heat at the contact point, causing the contact point temperature to drop (i.e., cooling). Heat is transferred to the other side, the cold end becomes colder and the hot end becomes hotter; when the current is reversed, electrons release heat and the contact point heats up (i.e., heating). The hot end absorbs heat and the cold end releases heat. Common semiconductor refrigerators can easily achieve a temperature difference of more than 30°C on the front and back. Generally speaking, the heat generated by a semiconductor refrigerator is about 5 times the cooling capacity, and an external radiator must be used in conjunction with a fan to suppress the heat. Summary of the invention

[0005] The purpose of the present invention is to provide an electric constant temperature inclination sensor, which solves the technical problems that the existing electric constant temperature inclination sensors have operating temperature that is not the zero drift temperature calibrated at the factory, have certain limitations, and have an internal structure that is not compact enough, which is not conducive to on-site implementation.

[0006] To achieve the above-mentioned purpose, the present invention provides an electric constant temperature inclination sensor, comprising a metal shell, a heat sink, an inclination sensor PCB, a semiconductor refrigerator, a constant temperature control board PCB and a cooling fan, the semiconductor refrigerator is arranged below the inclination sensor PCB, the constant temperature control board PCB is arranged below the semiconductor refrigerator, the heat sink is located below the constant temperature control board PCB to dissipate heat for the constant temperature control board, the cooling fan is located below the heat sink, the metal shell, the heat sink and the constant temperature control board PCB together form a closed space for accommodating the inclination sensor PCB, the semiconductor refrigerator and the constant temperature control board PCB.

[0007] Wherein, the electric constant temperature inclination sensor further comprises an air inlet and an air outlet, and the air inlet and the air outlet are used to limit the flow direction of the heat dissipation air and enhance the heat dissipation efficiency of the heat sink.

[0008] Wherein, the electric constant temperature inclination sensor also includes a connecting cable, the metal shell has holes for installing communication and power connectors, and the connecting cable is electrically connected to the constant temperature control board PCB through the power connector.

[0009] Wherein, the inclination sensor PCB is provided with an inclination sensor, a conditioning circuit and an analog-to-digital conversion circuit.

[0010] Wherein, a microcontroller and a semiconductor refrigeration chip driving circuit are arranged on the constant temperature control board PCB.

[0011] Among them, the power supply voltage on the connecting cable is 12V, and the communication mode is RS-485 communication, which has strong anti-interference ability.

[0012] Wherein, the cooling plate of the semiconductor refrigerator and the heat dissipation fan are loaded with PWM waves, and the PWM waves are generated by a classic PID algorithm.

[0013] The present invention discloses an electric constant temperature inclination sensor. The electric constant temperature inclination sensor has the semiconductor refrigerator installed below the inclination sensor PCB. When the temperature of the inclination sensor is too high, the inclination sensor is cooled. When the temperature of the inclination sensor is too low, the inclination sensor is heated. At the same time, the active cooling fan is used to dissipate heat from the radiator of the semiconductor refrigerator, so that the electric constant temperature inclination sensor can always operate at an optimal temperature. The structure of this solution is compact and easy to implement on the engineering site. It solves the technical problems of the existing electric constant temperature inclination sensor that the operating temperature is not the zero drift temperature calibrated at the factory, has certain limitations, and the internal structure is not compact enough, which is not conducive to on-site implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0015] Figure 1 1 is a top view of the electric constant temperature inclination sensor according to the first embodiment of the present invention.

[0016] Figure 2 1 is a bottom view of the electric constant temperature inclination sensor according to the first embodiment of the present invention.

[0017] Figure 3 The electric constant temperature inclination sensor of the first embodiment of the present invention Figure 1 and Figure 2 AA section view.

[0018] Figure 4 The electric constant temperature inclination sensor of the first embodiment of the present invention Figure 1 and Figure 2 BB cross-sectional view.

[0019] In the figure: 1-metal casing, 2-heat sink, 3-air inlet, 4-air outlet, 5-tilt sensor PCB, 6-semiconductor refrigerator, 7-constant temperature control board PCB, 8-cooling fan, 9-connecting cable, 10-tilt sensor, 11-conditioning circuit and analog-to-digital conversion circuit, 12-microcontroller and semiconductor refrigerator drive circuit, 13-power connector. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0021] First embodiment:

[0022] See also Figures 1 to 4 ,in, Figure 1 is a top view of the electric constant temperature inclination sensor of the first embodiment of the present invention, Figure 2 is a bottom view of the electric constant temperature inclination sensor of the first embodiment of the present invention, Figure 3 The electric constant temperature inclination sensor of the first embodiment of the present invention Figure 1 and Figure 2 AA section view, Figure 4 The electric constant temperature inclination sensor of the first embodiment of the present invention Figure 1 and Figure 2 BB cross-sectional view, the present invention provides an electric constant temperature inclination sensor, including a metal shell 1, a heat sink 2, an air inlet 3, an air outlet 4, an inclination sensor PCB5, a semiconductor refrigerator 6, a constant temperature control board PCB7, a cooling fan 8, and a connecting cable 9.

[0023] In this embodiment, the electric constant temperature inclination sensor is provided with the semiconductor refrigerator 6 installed under the inclination sensor PCB5. When the temperature of the inclination sensor 10 is too high, the inclination sensor 10 is cooled; when the temperature of the inclination sensor 10 is too low, the inclination sensor 10 is heated. At the same time, the active cooling fan 8 is used to dissipate the heat of the radiator of the semiconductor refrigerator 6, so that the electric constant temperature inclination sensor can always operate at the optimal temperature. The structure of this solution is compact and easy to implement on the engineering site. It solves the technical problems of the existing electric constant temperature inclination sensor that the operating temperature is not the zero drift temperature calibrated at the factory, has certain limitations, and the internal structure is not compact enough, which is not conducive to on-site implementation.

[0024] Among them, the semiconductor refrigerator 6 is located below the inclination sensor PCB5, the constant temperature control board PCB7 is located below the semiconductor refrigerator 6, the heat sink 2 is located below the constant temperature control board PCB7, and dissipates heat for the constant temperature control board. The cooling fan 8 is located below the heat sink 2. The metal shell 1, the heat sink 2 and the constant temperature control board PCB7 together form a closed space for accommodating the inclination sensor PCB5, the semiconductor refrigerator 6 and the constant temperature control board PCB7. The constant temperature control board PCB7 is electrically connected to the semiconductor refrigerator 6, the inclination sensor PCB5 and the cooling fan 8.

[0025] Secondly, the air inlet 3 and the air outlet 4 are used to limit the flow direction of the heat dissipation air and enhance the heat dissipation efficiency of the heat sink 2. The air inlet 3 and the air outlet 4 are formed by the gap formed by the metal shell 1, the heat sink 2, the cooling fan 8 and the surface on which the sensor is installed, and the internal gap is filled with thermal insulation silica gel or aerogel to reduce the heat exchange between the sensor and the metal shell 1.

[0026] Again, the metal shell 1 has holes for installing the communication and power connector 13. The connecting cable 9 is electrically connected to the constant temperature control board PCB7 through the power connector 13. The power supply voltage on the connecting cable 9 is 12V, and the communication method is RS-485 communication, which has strong anti-interference ability.

[0027] Meanwhile, the inclination sensor PCB5 is provided with an inclination sensor 10, a conditioning circuit and an analog-to-digital conversion circuit 11, and the inclination sensor 10 uses an acceleration sensor with analog output.

[0028] In addition, a microcontroller and a semiconductor refrigeration chip driving circuit 12 are arranged on the constant temperature control board PCB7. The microcontroller and the microcontroller in the semiconductor refrigeration chip driving circuit 12 use a microcontroller of the STM32 series packaged as a QFN package.

[0029] Finally, the cooling fins of the semiconductor refrigerator 6 and the cooling fan 8 are loaded with PWM waves, and the PWM waves are generated by a classic PID algorithm.

[0030] When using an electric constant temperature tilt sensor of this embodiment, Figure 1 As shown, the power connector 13 is installed on the metal housing 1 through a reserved hole, and the connecting cable 9 is connected to the power connector 13, as shown in FIG. Figure 3 As shown, the inclination sensor 10 and the conditioning circuit and the analog-to-digital conversion circuit 11 are first welded on the inclination sensor PCB5, and then the microcontroller and the semiconductor refrigeration chip drive circuit 12 are welded on the constant temperature control board PCB7. After that, the power line of the semiconductor refrigerator 6 is also welded on the constant temperature control board PCB7, and the inclination sensor PCB5 with welded components is installed in the metal shell 1. Then, the cable inside the power connector 13 is led out from the gap between the inclination sensor PCB5 and the metal shell 1, and the cable is connected to the constant temperature control board PCB 7, and then, install the thermostatic control board PCB7 with components welded thereon under the inclination sensor PCB5 to ensure that the semiconductor refrigerator 6 on the thermostatic control board PCB7 is tightly attached to the inclination sensor PCB5, and then install the heat sink 2 under the thermostatic control board PCB7. It is worth noting that the position with the notch of the heat sink 2 needs to be aligned with the air outlet 4 to ensure that the thermostatic control board PCB7 is tightly attached to the heat sink 2. Finally, install the cooling fan 8 on the heat sink 2, tighten the fixing screws, and complete the entire installation process of the electric constant temperature inclination sensor.

[0031] After the installation is completed, the side of the connecting cable 9 away from the sensor end is connected to the controller with power and signal lines. The power and signal enter the interior through the connecting cable 9 and the power connector 13, and finally reach the constant temperature control board PCB7, so that the signal can reach the microcontroller position through conversion, and the power supply can be stepped down to supply power to related components. At this time, the electric constant temperature inclination sensor can be powered on and started.

[0032] After the electric constant temperature inclination sensor is powered on, the microcontroller on the constant temperature control board PCB7 obtains the dual-axis angle information and real-time temperature information through the electrical connection with the analog-to-digital conversion chip on the inclination sensor PCB5, and stores them in the microcontroller memory. At the same time, by comparing whether the temperature on the inclination sensor PCB5 is consistent with the preset value, if it is higher than the set temperature, the semiconductor refrigerator 6 is energized in the forward direction to achieve cooling. If it is lower than the set temperature, the semiconductor refrigerator 6 is energized in the reverse direction to achieve heating, and the PWM wave is dynamically generated according to the temperature difference and the change trend to adjust the temperature.

[0033] If the temperature on the constant temperature control board PCB7 is too high to maintain the temperature on the inclination sensor PCB5, PWM is generated according to the temperature to start the cooling fan 8, thereby helping to reduce the temperature difference. If the speed of the cooling fan 8 has reached the maximum and the temperature is still high, it means that the maximum temperature adjustment range of the device is exceeded. At this time, the semiconductor refrigerator 6 and the cooling fan 8 are turned off, and the traditional software temperature compensation mode is used. When the temperature of the inclination sensor PCB5 and the constant temperature control board PCB7 returns to the adjustable range, the temperature control mode is restarted.

[0034] At any stage after power-on, as long as the controller at the other end of the connecting cable 9 sends a request signal through the signal line, the present invention will return the current angle and temperature information in real time.

[0035] Preferably, the microcontroller uses a microcontroller whose STM32 series package is a QFN package.

[0036] Preferably, the power supply voltage on the connecting cable 9 is 12V, and the communication mode is RS-485 communication, which has strong anti-interference performance.

[0037] Preferably, the PWM waves loaded on the cooling fins of the semiconductor refrigerator 6 and the cooling fan 8 are generated by a classical PID algorithm.

[0038] Preferably, the tilt sensor 10 uses an acceleration sensor with analog output.

[0039] Preferably, the internal space is filled with heat-insulating silica gel or aerogel to reduce heat exchange between the sensor and the metal housing 1 .

[0040] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. An electric constant temperature inclination sensor, characterized in that: It includes a metal shell, a heat sink, an inclination sensor PCB, a semiconductor refrigerator, a constant temperature control board PCB and a cooling fan. The semiconductor refrigerator is located below the inclination sensor PCB, and the constant temperature control board PCB is located below the semiconductor refrigerator. The heat sink is located below the constant temperature control board PCB to dissipate heat for the constant temperature control board. The cooling fan is located below the heat sink. The metal shell, the heat sink and the constant temperature control board PCB together form a closed space for accommodating the inclination sensor PCB, the semiconductor refrigerator and the constant temperature control board PCB.

2. The electric constant temperature inclination sensor according to claim 1, characterized in that: The electric constant temperature inclination sensor further comprises an air inlet and an air outlet, wherein the air inlet and the air outlet are used to limit the flow direction of the heat dissipation air and enhance the heat dissipation efficiency of the heat sink.

3. The electric constant temperature inclination sensor according to claim 1, characterized in that: The electric constant temperature inclination sensor also includes a connecting cable. The metal housing has holes for installing communication and power connectors. The connecting cable is electrically connected to the constant temperature control board PCB through the power connector.

4. The electric constant temperature inclination sensor according to claim 1, characterized in that: The inclination sensor PCB is provided with an inclination sensor, a conditioning circuit and an analog-to-digital conversion circuit.

5. The electric constant temperature inclination sensor according to claim 1, characterized in that: The constant temperature control board PCB is provided with a microcontroller and a semiconductor refrigeration chip driving circuit.

6. The electric constant temperature inclination sensor according to claim 3, characterized in that: The power supply voltage on the connecting cable is 12V, and the communication mode is RS-485 communication, which has strong anti-interference ability.

7. The electric constant temperature tilt sensor according to claim 1, characterized in that: The cooling fins of the semiconductor refrigerator and the heat dissipation fan are loaded with PWM waves, and the PWM waves are generated by a classic PID algorithm.

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