A handheld oxygen detector

Abstract

This utility model relates to the field of gas detector technology, and in particular to a handheld oxygen detector. It includes a handheld casing, a detection component mounted on the upper part of the handheld casing, a display screen mounted on the handheld casing, a control circuit board mounted inside the handheld casing, and control buttons mounted on the handheld casing. The detection component includes a mounting connection part, a probe casing, and a sensor body mounted on the mounting connection part. The probe casing is hollow and detachably connected to the mounting connection part. The control circuit board includes an amplification circuit, a voltage regulation circuit, an MCU control circuit, and an LCD display circuit. This utility model features an ingenious design, facilitating the assembly and replacement of the sensor body, allowing users to change the sensor body according to actual needs, thus improving flexibility; it also improves the stability and reliability of the circuit; and it enhances the sensitivity and accuracy of the signal.

Description

Technical Field

[0001] This utility model relates to the field of gas detector technology, and in particular to a handheld oxygen detector. Background Technology

[0002] In the field of gas detection technology, oxygen detectors, as important safety monitoring devices, are widely used in various fields such as industry, medicine, and environmental protection. However, traditional oxygen detectors have some design shortcomings that affect their effectiveness and user experience.

[0003] Currently, the detection components of traditional oxygen detectors are often designed as a single unit, with the sensor body and probe housing fixedly connected and not easy to disassemble. This design makes it difficult for users to replace or clean the sensor body, which not only increases maintenance costs but also reduces the flexibility of the detector.

[0004] Furthermore, traditional oxygen detectors often neglect voltage stability in their circuit design. During operation, the detector may be subject to various external interferences, causing power supply voltage fluctuations, which in turn affect the stability and reliability of the circuit. This instability can lead to errors in the detector's measurement results or even damage the detector's circuit components. Summary of the Invention

[0005] This invention addresses the problems of existing technologies by providing a handheld oxygen detector. Its ingenious design facilitates the assembly and replacement of the sensor body, allowing users to easily change the sensor body according to their actual needs, thus improving usability. It also enhances the stability and reliability of the circuitry and improves the sensitivity and accuracy of the signal.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This utility model provides a handheld oxygen detector, which includes a handheld shell, a detection component mounted on the upper part of the handheld shell, a display screen mounted on the handheld shell, a control circuit board mounted inside the handheld shell, and control buttons mounted on the handheld shell. The detection component includes a mounting connection part, a probe shell, and a sensor body mounted on the mounting connection part. The probe shell is hollow and detachably connected to the mounting connection part. The display screen, the sensor body, and the control buttons are electrically connected to the control circuit board. The control circuit board is provided with an amplification circuit, a voltage regulator circuit, an MCU control circuit, and an LCD display circuit. The output terminal of the sensor body is connected to the input terminal of the amplification circuit, the output terminal of the amplification circuit is connected to the MCU control circuit, an external power supply is connected to the input terminal of the voltage regulator circuit, the output terminal of the voltage regulator circuit is connected to the MCU control circuit, and the output terminal of the MCU control circuit is connected to the LCD display circuit.

[0008] The outer periphery of the mounting connection part is provided with multiple connecting protrusions, and the lower end of the inner wall of the probe housing is provided with multiple insertion slots. The top of each insertion slot is also provided with a horizontal slot, and the insertion slot communicates with the slot.

[0009] The back of the handheld casing is provided with a battery compartment, and a battery cover can also be detachably connected to the back of the handheld casing to cover the battery compartment.

[0010] The MCU control circuit includes a control chip U5, which is model SWM181CBT6.

[0011] The control buttons include a power button K1; the voltage regulator circuit includes a MOSFET Q1, resistors R5, R11, and R12, a bidirectional diode D5, capacitors C5, C6, C7, C8, C9, C10, and C14, and a voltage regulator chip U3. The positive terminal of the external 4.5V power supply is connected to the source of the MOSFET Q1, the gate of the MOSFET Q1 is connected to one end of resistor R5, the drain of the MOSFET Q1 is connected to one end of capacitor C5, one end of capacitor C6, and the VIN pin of the voltage regulator chip U3, and the other end of resistor R5, the negative terminal of the external 4.5V power supply, the other end of capacitor C5, the other end of capacitor C6, and the voltage regulator chip U3. The VSS pins of the chip are grounded. The CE pin of the voltage regulator chip U3 is connected to the third pin of the bidirectional diode D5. The first pin of the bidirectional diode D5 is connected to one end of the capacitor C9 and the MCU control circuit. The second pin of the bidirectional diode D5 is connected to one end of the resistor R12, one end of the resistor R11, and one end of the capacitor C10. The other end of the resistor R11 is connected to the power button K1. The other end of the resistor R12 and the other end of the capacitor C10 are grounded. The OUT pin of the voltage regulator chip U3 is connected to one end of the capacitor C7, one end of the capacitor C8, and one end of the capacitor C14. The other ends of the capacitors C7, C8, and C14 are grounded.

[0012] The voltage regulator chip U3 is model XC6204B302MR.

[0013] The amplifier circuit includes amplifier U4-A and amplifier U4-B.

[0014] The LCD display circuit includes a display chip U1, which is model TM1729.

[0015] The handheld casing is also equipped with a buzzer, which is electrically connected to the control circuit board.

[0016] The handheld casing is also equipped with an alarm light, which is electrically connected to the control circuit board.

[0017] The beneficial effects of this utility model are:

[0018] This invention features an ingenious design. The probe housing is hollow and detachably connected to the mounting connector, facilitating easy assembly and replacement of the sensor body. This allows users to easily change the sensor body according to their actual needs, increasing flexibility. The display screen, sensor body, and control buttons are all electrically connected to the control circuit board, enabling signal transmission and control functions. The detected values ​​are conveniently displayed on the screen, and the control buttons are easy for users to use. The voltage stabilizing circuit ensures stable voltage during operation, improving circuit stability and reliability. Simultaneously, the sensor body's output signal is amplified by the amplifier circuit before being transmitted to the MCU control circuit for processing, improving signal sensitivity and accuracy. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a handheld oxygen detector according to the present invention.

[0020] Figure 2 This is an exploded view of the structure of a handheld oxygen detector according to the present invention.

[0021] Figure 3 This is a schematic diagram of the probe housing of this utility model.

[0022] Figure 4 This is a circuit diagram of the MCU control circuit of this utility model.

[0023] Figure 5 This is a circuit diagram of the voltage regulator circuit of this utility model.

[0024] Figure 6 This is a circuit diagram of the amplifier circuit of this utility model.

[0025] Figure 7 This is a circuit diagram of the LCD display circuit of this utility model.

[0026] exist Figures 1 to 7 The reference numerals in the figures include:

[0027] 1. Handheld housing; 2. Detection components; 3. Display screen; 4. Control buttons; 5. Mounting connector; 6. Probe housing; 7. Connecting protrusion; 8. Insertion slot; 9. Card slot; 10. Battery cover. Detailed Implementation

[0028] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0029] A handheld oxygen detector, such as Figures 1 to 7As shown, it includes a handheld housing 1, a detection component 2 mounted on the upper part of the handheld housing 1, a display screen 3 mounted on the handheld housing 1, a control circuit board mounted inside the handheld housing 1, and control buttons 4 mounted on the handheld housing 1. The detection component 2 includes a mounting connection part 5, a probe housing 6, and a sensor body mounted on the mounting connection part 5. The probe housing 6 is hollow and detachably connected to the mounting connection part 5. The display screen 3, the sensor body, and the control buttons 4 are electrically connected to the control circuit board. The control circuit board is provided with an amplification circuit, a voltage regulator circuit, an MCU control circuit, and an LCD display circuit. The output terminal of the sensor body is connected to the input terminal of the amplification circuit, the output terminal of the amplification circuit is connected to the MCU control circuit, an external power supply is connected to the input terminal of the voltage regulator circuit, the output terminal of the voltage regulator circuit is connected to the MCU control circuit, and the output terminal of the MCU control circuit is connected to the LCD display circuit.

[0030] Specifically, this invention features an ingenious design. The probe housing 6 is hollow and detachably connected to the mounting connection part 5. Disassembly facilitates the assembly and replacement of the sensor body, allowing users to easily change the sensor body according to actual needs and improving flexibility. The display screen 3, sensor body, and control buttons 4 are all electrically connected to the control circuit board, enabling signal transmission and control functions. The detected values ​​are conveniently displayed on the display screen 3, and the control buttons 4 are easy for users to use. This invention utilizes the sensor body to detect oxygen concentration. The sensor body is an electrochemical sensor in the prior art. Through the redox reaction between the working electrode and the reference electrode, a current proportional to the oxygen concentration is generated, thereby calculating the oxygen concentration. The voltage stabilizing circuit ensures the stability of the voltage during operation, improving the stability and reliability of the circuit. Simultaneously, the output signal of the sensor body is amplified by the amplifier circuit before being transmitted to the MCU control circuit for processing, improving the signal sensitivity and accuracy.

[0031] In this embodiment, the outer periphery of the mounting connection part 5 is provided with a plurality of connecting protrusions 7, and the lower end of the inner wall of the probe housing 6 is provided with a plurality of insertion slots 8. Each insertion slot 8 has a horizontally positioned retaining groove 9 at its top, and the insertion slot 8 communicates with the retaining groove 9. Specifically, during assembly, after aligning the connecting protrusions 7 with the insertion slots 8, the probe housing 6 is inserted into the mounting connection part 5. After insertion, the probe housing 6 is rotated so that the connecting protrusions 7 enter the retaining grooves 9, facilitating the locking of the probe housing 6 onto the mounting connection part 5 and preventing it from loosening or falling off.

[0032] In this embodiment, a battery compartment is provided on the back of the handheld casing 1, and a battery cover 10 is detachably connected to the back of the handheld casing 1. The battery cover 10 is used to cover the battery compartment. Specifically, the battery compartment contains a 4.5 battery for power supply; the battery cover 10 is detachable for user convenience.

[0033] In this embodiment, the MCU control circuit includes a control chip U5, model SWM181CBT6. The control buttons include a power button K1; the voltage regulator circuit includes a MOSFET Q1, resistors R5, R11, and R12, a bidirectional diode D5, capacitors C5, C6, C7, C8, C9, C10, and C14, and a voltage regulator chip U3. The positive terminal of an external 4.5V power supply (0.5V battery) is connected to the source of MOSFET Q1. The gate of MOSFET Q1 is connected to one end of resistor R5. The drain of MOSFET Q1 is connected to one end of capacitor C5, one end of capacitor C6, and the VIN pin of voltage regulator chip U3. The other end of resistor R5, the negative terminal of the external 4.5V power supply, the other end of capacitor C5, the other end of capacitor C6, and the VSS pin of voltage regulator chip U3 are connected to the voltage regulator chip U3. The voltage regulator chip U3 is grounded. Its CE pin is connected to the third pin of bidirectional diode D5. The first pin of bidirectional diode D5 is connected to one end of capacitor C9 and the MCU control circuit. The second pin of bidirectional diode D5 is connected to one end of resistor R12, one end of resistor R11, and one end of capacitor C10. The other end of resistor R11 is connected to the power button K1. The other ends of resistor R12 and capacitor C10 are grounded. The OUT pin of the voltage regulator chip U3 is connected to one end of capacitor C7, one end of capacitor C8, and one end of capacitor C14. The other ends of capacitor C7, one end of capacitor C8, and one end of capacitor C14 are grounded respectively. The voltage regulator chip U3 is model XC6204B302MR.

[0034] Specifically, the circuit uses three 1.5V dry cell batteries for power. The battery voltage first passes through MOSFET Q1, which isolates the power supply and prevents reverse connection. After passing through MOSFET Q1, the power supply voltage B+ is input to the voltage regulator chip U3 and regulated to a 3V output. The power supply voltage B+ is then connected to bidirectional diode D5 via power button K1 and resistor R11. When the power button is pressed, the bidirectional diode D5 conducts between pins 2 and 3, controlling the output of U3 and thus controlling the power supply of the entire circuit. The power supply voltage B+ is used to detect the battery status via two voltage divider resistors R10 and R18.

[0035] In this embodiment, the amplification circuit includes amplifier U4-A and amplifier U4-B. Specifically, the sensor body collects and inputs the signal to pin 5 of amplifier U4-B. In-phase amplification is used; amplifier U4-B performs a first-stage amplification, and amplifier U4-A performs a second-stage amplification, where Av1 = 1 + R37 / R39 and Av2 = 1 + R41 / R42. The amplified signal is then sent to the MCU for processing.

[0036] In this embodiment, the LCD display circuit includes a display chip U1, model TM1729; the handheld casing is also equipped with a buzzer, which is electrically connected to the control circuit board. The handheld casing also includes an alarm light, which is electrically connected to the control circuit board. Specifically, the MCU control circuit includes a control chip U5, model SWM181CBT6, which processes signals from the sensor body and controls the display screen and the operation of the alarm light and buzzer. When the detector detects an abnormal gas concentration, the MCU control circuit controls the buzzer to sound an alarm, and the alarm light flashes to alert the user.

[0037] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A handheld oxygen detector, characterized in that: The device includes a handheld casing, a detection component mounted on the upper part of the handheld casing, a display screen mounted on the handheld casing, a control circuit board mounted inside the handheld casing, and control buttons mounted on the handheld casing. The detection component includes a mounting connection part, a probe casing, and a sensor body mounted on the mounting connection part. The probe casing is hollow and detachably connected to the mounting connection part. The display screen, the sensor body, and the control buttons are electrically connected to the control circuit board. The control circuit board is equipped with an amplification circuit, a voltage regulator circuit, an MCU control circuit, and an LCD display circuit. The output terminal of the sensor body is connected to the input terminal of the amplification circuit, the output terminal of the amplification circuit is connected to the MCU control circuit, an external power supply is connected to the input terminal of the voltage regulator circuit, the output terminal of the voltage regulator circuit is connected to the MCU control circuit, and the output terminal of the MCU control circuit is connected to the LCD display circuit.

2. The handheld oxygen detector according to claim 1, characterized in that: The outer periphery of the mounting connection part is provided with multiple connecting protrusions, and the lower end of the inner wall of the probe housing is provided with multiple insertion slots. The top of each insertion slot is also provided with a horizontal slot, and the insertion slot communicates with the slot.

3. A handheld oxygen detector according to claim 1, characterized in that: The back of the handheld casing is provided with a battery compartment, and a battery cover can also be detachably connected to the back of the handheld casing to cover the battery compartment.

4. A handheld oxygen detector according to claim 1, characterized in that: The MCU control circuit includes a control chip U5, which is model SWM181CBT6.

5. A handheld oxygen detector according to claim 1, characterized in that: The control buttons include a power button K1; the voltage regulator circuit includes a MOSFET Q1, resistors R5, R11, and R12, a bidirectional diode D5, capacitors C5, C6, C7, C8, C9, C10, and C14, and a voltage regulator chip U3. The positive terminal of the external 4.5V power supply is connected to the source of the MOSFET Q1, the gate of the MOSFET Q1 is connected to one end of resistor R5, the drain of the MOSFET Q1 is connected to one end of capacitor C5, one end of capacitor C6, and the VIN pin of the voltage regulator chip U3, and the other end of resistor R5, the negative terminal of the external 4.5V power supply, the other end of capacitor C5, the other end of capacitor C6, and the voltage regulator chip U3. The VSS pins of the voltage regulator chip are grounded. The CE pin of the voltage regulator chip U3 is connected to the third pin of the bidirectional diode D5. The first pin of the bidirectional diode D5 is connected to one end of the capacitor C9 and the MCU control circuit. The second pin of the bidirectional diode D5 is connected to one end of the resistor R12, one end of the resistor R11, and one end of the capacitor C10. The other end of the resistor R11 is connected to the power button K1. The other end of the resistor R12 and the other end of the capacitor C10 are grounded. The OUT pin of the voltage regulator chip U3 is connected to one end of the capacitor C7, one end of the capacitor C8, and one end of the capacitor C14. The other ends of the capacitors C7, C8, and C14 are grounded.

6. A handheld oxygen detector according to claim 5, characterized in that: The voltage regulator chip U3 is model XC6204B302MR.

7. A handheld oxygen detector according to claim 1, characterized in that: The amplifier circuit includes amplifier U4-A and amplifier U4-B.

8. A handheld oxygen detector according to claim 1, characterized in that: The LCD display circuit includes a display chip U1, which is model TM1729.

9. A handheld oxygen detector according to claim 1, characterized in that: The handheld casing is also equipped with a buzzer, which is electrically connected to the control circuit board.

10. A handheld oxygen detector according to claim 1, characterized in that: The handheld casing is also equipped with an alarm light, which is electrically connected to the control circuit board.

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