Portable gas detection device with micro-energy pickup function

Abstract

The utility model provides a portable gas detection device with a micro-energy pickup function, which is used for solving the technical problems that an energy recovery structure in an existing gas detection device is relatively high in dependence on an external environment and poor in reliability. The device comprises a shell, a power supply module is arranged in the shell, the power supply module is connected with a micro-energy pickup device, the micro-energy pickup device comprises a piezoelectric unit and a mass ball, the piezoelectric unit is matched with the mass ball, and the piezoelectric unit is connected with the power supply module. No matter whether the device is worn on the body or held in the hand, mechanical energy brought by horizontal inclination is easier to obtain, and the dependence degree on the external environment is lower. Under the condition of violent vibration or more vibration conditions, the micro-energy pickup device is used for picking up vibration energy to supply power to equipment, and the working time can be effectively prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of gas detection, and in particular to a portable gas detection device with micro-energy pickup function. Background Technology

[0002] With the increasing demand for self-powered devices, the full exploitation of various energy sources that may exist in the working environment of portable gas detection devices, such as vibration energy, electromagnetic energy, and radio frequency energy, and the gradual optimization of energy extraction methods, has become a feasible power supply solution.

[0003] Harnessing minute amounts of energy from the environment to provide sustainable power for portable gas detection devices has attracted considerable attention from researchers. Among various energy sources, environmental vibration is the most compatible alternative energy source due to its ease of utilization and diverse properties. In scenarios with poor lighting (unsuitable for solar energy harvesting), weak radio frequency signals (unsuitable for radio frequency energy harvesting), and insignificant temperature differences (unsuitable for thermoelectric energy harvesting), vibration energy harvesting can serve as an alternative power solution. Currently, no applications of vibration energy harvesting in portable gas detection devices have been observed or found.

[0004] Patent application number 202110882623.6 discloses a low-power wireless self-powered gas sensor based on energy recovery, belonging to the field of gas sensor technology. The technical problem to be solved is to provide an improvement in the hardware structure of a low-power wireless self-powered gas sensor based on energy recovery. The technical solution adopted to solve the above technical problem includes a sensitive signal processing module, a vibration signal acquisition module, an energy recovery and storage module, a control module, a communication module, a display module, and an audible and visual alarm module. The sensitive signal processing module and the vibration signal acquisition module are located in independent gas chambers inside the sensor. The vibration signal acquisition module collects vibration signals flowing into the gas chamber and converts the mechanical energy generated by the vibration into electrical energy through piezoelectric materials. The energy recovery and storage module converts the alternating current generated by the piezoelectric materials in the vibration signal acquisition module into fluctuating direct current to power each module. The above invention is applied to gas sensors. The aforementioned patent utilizes airflow to drive the vibration of a reed, converting the mechanical energy generated by the vibration into electrical energy. While this allows for self-powering of the gas sensor, it is highly dependent on the external environment. If there is no external pressure difference or an effective airflow cannot be formed at the gas chamber inlet, the reed cannot vibrate, and thus no electrical energy can be generated. Furthermore, the patent employs a supercapacitor with significant self-discharge to store energy, making it difficult to achieve system energy self-sufficiency in practical applications. The energy recovery device in this patent has a complex structure, making miniaturization difficult. It is suitable for fixed gas detection devices but not for portable gas detection devices. Utility Model Content

[0005] To address the technical problems of high dependence on external environment and poor reliability of energy recovery structures in existing gas detection devices, this utility model proposes a portable gas detection device with micro-energy pickup function. Whether worn on the body or held in the hand, the mechanical energy generated by horizontal tilting is more easily acquired, and the dependence on external environment is lower.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A portable gas detection device with micro-energy pickup function includes a housing, a power module is provided inside the housing, the power module is connected to the micro-energy pickup device, the micro-energy pickup device includes a piezoelectric unit and a mass ball, the piezoelectric unit is matched with the mass ball, and the piezoelectric unit is connected to the power module.

[0007] Preferably, the mass ball is movably disposed within the movable cavity, and the movable cavity is provided with a piezoelectric unit; the movable cavity is horizontally disposed within the housing.

[0008] Preferably, the movable cavity is provided with a shock-absorbing spring, the piezoelectric unit is fixed at both ends of the movable cavity, and the shock-absorbing spring is fixed inside the piezoelectric unit.

[0009] Preferably, the piezoelectric unit is a piezoelectric element, and the piezoelectric element is a PZT5 circular piezoelectric sensor.

[0010] Preferably, the movable cavity is a cylindrical ceramic cavity, which is a cylindrical ceramic insulating cavity with a smooth inner wall.

[0011] Preferably, the piezoelectric unit is connected to a rectifier circuit, and the rectifier circuit is connected to a power supply module.

[0012] Preferably, the housing also includes a data storage module and a communication module, both of which are connected to the microcontroller, and the communication module is compatible with external devices.

[0013] Preferably, the housing is provided with a display module and a button module, both of which are connected to the microcontroller.

[0014] Preferably, the housing also includes a clock module and an alarm module, both of which are connected to the microcontroller.

[0015] Preferably, the gas sensor is at least one of a semiconductor gas sensor, an electrochemical gas sensor, a catalytic combustion gas sensor, a thermally conductive gas sensor, an infrared gas sensor, a PID sensor, and a laser sensor.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. In cases of severe or frequent vibration, portable gas detection devices can use micro-energy pickup devices to pick up vibration energy to power the equipment, which can effectively extend the working time.

[0018] 2. Installing a shock-absorbing spring on the piezoelectric sheet can prevent the mass ball from directly impacting the piezoelectric sheet and causing damage or causing users of portable gas detection devices to feel a noticeable impact. It can also prevent noise and strong vibration.

[0019] 3. The movable chamber is installed horizontally because portable gas detection devices are more prone to horizontal vibrations during use compared to vertical orientations, allowing for the collection of more vibrational energy. The horizontal placement of the micro-energy pickup device effectively reduces spring fatigue, resulting in a longer service life and preventing fatigue from affecting energy conversion efficiency.

[0020] 4. Piezoelectric plates are installed at both ends of the moving cavity, which can pick up energy at both ends of the reciprocating motion of the mass ball, thus improving the energy pickup efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 for Figure 1 The diagram shows the structure of the micro-energy pickup device.

[0024] In the diagram, 101 is a micro-energy pickup device; 102 is a rectifier circuit; 103 is a power supply module; 104 is a clock module; 105 is a communication module; 106 is a data storage module; 107 is a microprocessor; 108 is a display module; 109 is a gas sensor; 110 is an alarm module; 111 is a button module; 201 is a piezoelectric unit; 202 is a movable cavity; 203 is a mass ball; and 204 is a shock-absorbing spring. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figure 1 As shown, a portable gas detection device with micro-energy pickup function includes a housing. Inside the housing are a gas sensor 109, a microcontroller 107, and a power module 103. The gas sensor 109 detects the gas concentration in the environment. The power module 103 provides power to the microcontroller 107. The microcontroller 107 acquires the data collected by the gas sensor 109 and performs corresponding actions. Both the gas sensor 109 and the power module 103 are connected to the microcontroller 107. The power module 103 is connected to a micro-energy pickup device 101, which can collect micro-energy during device use. The power module 103 is powered by a rechargeable lithium battery and provides different voltage outputs based on the operating voltages of the various modules in the portable gas detection device. The various modules in the portable gas detection device operate at only 3V and 3.3V. The power module uses two SGM2205-ADJ LDO chips with adjustable output, providing different voltage outputs by configuring different feedback voltages. The microprocessor 107 uses an ultra-low power STM32L071RBT6 chip, and the signal output from the gas sensor 109 is processed by the microprocessor 107. The signal output from the gas sensor 109 is connected to the ADC pin of the microprocessor 107. The microprocessor 107 calculates the output voltage of the gas sensor 109 based on the acquired AD value, thereby calculating the concentration of the target gas in the environment. The micro-energy harvesting module 101 can use different types of micro-energy harvesting modules such as wireless electromagnetic energy harvesting, thermoelectric energy harvesting, magnetorheological damping energy harvesting, frictional energy harvesting, solar energy harvesting, and vibration energy harvesting. In this preferred embodiment, vibration energy harvesting is selected.

[0027] Furthermore, such as Figure 2 As shown, the micro-energy harvesting device 101 includes a piezoelectric unit 201 and a mass ball 203. The piezoelectric unit 201 is matched with the mass ball 203 and is connected to the power module 103. During its movement, the mass ball 203 collides with the piezoelectric unit 201, and the piezoelectric unit 201 collects the vibration energy exerted on the piezoelectric unit 201 by the mass ball 203 during its rolling.

[0028] The mass ball 203 is movably disposed within the movable cavity 202, which provides space for the mass ball 203 to move. The inner wall of the movable cavity 202 is slightly larger than the diameter of the mass ball 203, so as not to affect the rolling of the mass ball 203. A piezoelectric unit 201 is provided inside the movable cavity 202. During the rolling of the mass ball 203, the movable cavity 202 is horizontally disposed within the housing, so that the micro-energy pickup device 101 is horizontally mounted at the bottom of the portable gas detection device housing. This can effectively reduce the fatigue of the shock-absorbing spring 24, extend its service life, and prevent fatigue from affecting the energy conversion efficiency.

[0029] The movable cavity 202 is equipped with a shock-absorbing spring 204. Piezoelectric units 201 are fixed at both ends of the movable cavity 202, and the shock-absorbing springs 204 are fixed inside the piezoelectric units 201. The shock-absorbing springs 204 are installed at both ends of the cylindrical ceramic cavity 202, allowing the extraction of vibrational energy generated during the back-and-forth movement of the mass ball 203. The two piezoelectric units 201 are connected in parallel and transmitted to the rectifier circuit. When the mass ball 203 bounces back from the left to the right, an energy wave is generated on the left. After striking the shock-absorbing spring 204 on the right, an energy wave or pulse is also generated on the right. After being connected in parallel, the energy is input to the rectifier circuit as intermittent energy waves.

[0030] Furthermore, the piezoelectric unit 201 is a piezoelectric element, specifically a PZT5 circular cymbal-type piezoelectric sensor. Circular cymbal-type piezoelectric sensors are easier to install at both ends of the cylindrical cavity compared to rectangular piezoelectric sensors. Moreover, the same force applied to the non-fixed end of a rectangular piezoelectric sensor produces the greatest deformation and the most efficient energy conversion, while the circular cymbal-type piezoelectric sensor produces the greatest deformation and the most efficient energy conversion when applied to the center. The movable cavity 202 is a cylindrical ceramic cavity. This cylindrical ceramic cavity uses a smooth-walled cylindrical ceramic insulating cavity. Its cylindrical shape and smoothness ensure minimal frictional resistance between the mass sphere and the inner wall at any angle during vertical use, reducing energy loss. Ceramic is harder and more durable than glass tubes, and can withstand higher pressures and temperatures. The portable gas detection device should not experience strong vibrations or impact sounds caused by energy conversion during normal use or operation.

[0031] Furthermore, the piezoelectric unit is connected to the rectifier circuit 102, which is connected to the power module 103. The rectifier circuit 102 is constructed using an LTC2588 chip. The rectifier circuit 102 can convert energy waves into direct current to power the equipment. Energy waves or energy pulses cannot make the equipment work normally.

[0032] The housing also includes a data storage module 106 and a communication module 105. Both the data storage module 106 and the communication module 105 are connected to the microcontroller 107, and the communication module 105 is compatible with external devices. The communication module 105 can use Bluetooth, WiFi, LoRa, NB-IoT, etc., and Bluetooth is preferred in this embodiment. The communication module 105 communicates with the microprocessor 107 via a UART serial port. The data storage module 106 uses a non-volatile erasable FLASH memory W25Q128JVSIQ and communicates with the microprocessor 107 via an SPI bus.

[0033] The housing is equipped with a display module 108 and a button module 111, both of which are connected to a microcontroller 107. The display module 108 uses a high-definition LCD dot matrix screen, which is directly driven by the microprocessor 107 via the SPI bus. The button module 111 consists of four buttons: a power button, an OK button, an up button, and a down button, used for operations such as powering on / off and setting parameters.

[0034] The housing also houses a clock module 104 and an alarm module 110, both of which are connected to a microcontroller 107. The clock module 104 uses a low-power, multi-functional clock chip, the PCF8563, and communicates with the microprocessor 107 via an IIC bus. The alarm module 110 is used to indicate alarm status, including but not limited to a buzzer, indicator light, and vibration motor. The alarm module 110 can be turned on or off by the microprocessor 107.

[0035] The gas sensor 109 employs one or more combinations of semiconductor gas sensors, electrochemical gas sensors, catalytic combustion gas sensors, thermal conductivity gas sensors, infrared gas sensors, PID sensors, and laser sensors. Different target gases require gas sensors based on different principles, thus allowing the use of different types of sensors for detecting various gases.

[0036] The micro-energy pickup device 101 can collect micro-energy during device use; the micro-energy generated by the micro-energy pickup module 101 is conditioned by the rectifier circuit 102 module, that is, the energy wave or energy pulse is converted into DC power by the LTC2588 chip to power the device, and the conditioned energy can charge the power module 103; the power module 103 provides energy for the entire device; the microprocessor 107 obtains the current time information through the clock module 104; the microprocessor 107 detects the gas concentration in the environment through the gas sensor 109; if the current gas concentration value exceeds the preset alarm threshold, the microprocessor 107 will display the alarm information on the alarm module 110; the microprocessor 107 displays the detected gas concentration on the display module 108; the microprocessor 107 can store the gas concentration information in the data storage module 106; the microprocessor 107 communicates with the outside through the communication module 105.

[0037] When the portable gas detector vibrates or tilts during use, the mass ball 203 rolls within the ceramic insulating cavity. When it impacts the damping spring 204, it exerts pressure on the piezoelectric element, causing it to deform and generate electrical energy. The damping spring 204 prevents the mass ball from directly impacting the piezoelectric element and causing damage, or from giving the user of the portable gas detector a noticeable impact.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A portable gas detection device with micro-energy pickup function, comprising a housing, wherein a power module (103) is disposed within the housing, characterized in that, The power module (103) is connected to the micro energy pickup device (101), which includes a piezoelectric unit (201) and a mass ball (203). The piezoelectric unit is matched with the mass ball (203) and is connected to the power module (103).

2. The portable gas detection device with micro-energy pickup function according to claim 1, characterized in that, The mass ball (203) is movably disposed in the movable cavity (202), and the movable cavity (202) is provided with a piezoelectric unit (201); the movable cavity (202) is horizontally disposed in the shell.

3. The portable gas detection device with micro-energy pickup function according to claim 2, characterized in that, The movable cavity (202) is provided with a shock-absorbing spring (204), the piezoelectric unit (201) is fixed at both ends of the movable cavity (202), and the shock-absorbing spring (204) is fixed inside the piezoelectric unit (201).

4. The portable gas detection device with micro-energy pickup function according to claim 2 or 3, characterized in that, The piezoelectric unit (201) is a piezoelectric element, which is a PZT5 circular piezoelectric sensor.

5. The portable gas detection device with micro-energy pickup function according to claim 4, characterized in that, The active cavity (202) is a cylindrical ceramic cavity, which adopts a cylindrical ceramic insulating cavity with a smooth inner wall.

6. The portable gas detection device with micro-energy pickup function according to claim 5, characterized in that, The piezoelectric unit is connected to the rectifier circuit (102), and the rectifier circuit (102) is connected to the power module (103).

7. The portable gas detection device with micro-energy pickup function according to claim 5 or 6, characterized in that, The housing also includes a data storage module (106) and a communication module (105). Both the data storage module (106) and the communication module (105) are connected to the microcontroller (107), and the communication module (105) is matched with external devices.

8. The portable gas detection device with micro-energy pickup function according to claim 7, characterized in that, The housing is provided with a display module (108) and a button module (111), both of which are connected to a microcontroller (107).

9. The portable gas detection device with micro-energy pickup function according to claim 8, characterized in that, The housing also includes a clock module (104) and an alarm module (110), both of which are connected to the microcontroller (107).

10. The portable gas detection device with micro-energy pickup function according to claim 8 or 9, characterized in that, The housing is equipped with a gas sensor (109), which is connected to a microcontroller (107). The gas sensor (109) is at least one of a semiconductor gas sensor, an electrochemical gas sensor, a catalytic combustion gas sensor, a thermal conduction gas sensor, an infrared gas sensor, a PID sensor, and a laser sensor.

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