CN210515623U - Alarm device for VSD negative pressure drainage - Google Patents
Alarm device for VSD negative pressure drainage Download PDFInfo
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- CN210515623U CN210515623U CN201922276814.9U CN201922276814U CN210515623U CN 210515623 U CN210515623 U CN 210515623U CN 201922276814 U CN201922276814 U CN 201922276814U CN 210515623 U CN210515623 U CN 210515623U
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Abstract
The utility model discloses an alarm device for VSD negative pressure drainage, which comprises a negative pressure bottle, a pressure sensor and an alarm component are arranged at the top of the negative pressure bottle, the alarm component comprises a signal regulating circuit, a threshold value comparison circuit and an early warning circuit which are connected in sequence, the pressure sensor is adopted to detect the air pressure in the negative pressure bottle in real time, the accuracy of alarm is improved in order to avoid the interference of external factors to pressure detection, the signal regulating circuit is designed to process the output signal of the pressure sensor, the interference of external environment and temperature to the air pressure detection is effectively reduced, the detection precision is greatly improved, the air pressure detection value is compared with a safe air pressure threshold value by utilizing the comparator principle, the electric potential signal is compared by an analog circuit to drive the early warning circuit to work, the phenomenon of error alarming of a digital voltmeter is effectively avoided, the anti-interference capability is strong, and the, the use effect is safer and more convenient.
Description
Technical Field
The utility model relates to a negative pressure drainage device technical field especially relates to an alarm device for VSD negative pressure drainage.
Background
The conventional portable VSD negative pressure drainage device is generally provided with a digital pressure gauge on a negative pressure bottle, and an alarm device in the digital pressure gauge is used for alarming abnormal negative pressure in the bottle. Because the digital pressure gauge belongs to the precision product, in transportation and use, because environmental disturbance, the improper reason of manual operation use probably causes the instrument can not normally work and show. The digital pressure gauge can also often appear pointer no longer zero position department in long-term use, leads to the manometer to instruct inaccurate, and especially when digital pressure gauge is in high temperature or cold environment, digital pressure gauge's precision influence is more obvious. Therefore, the pressure in the negative pressure bottle can be detected inaccurately, and the phenomenon of alarming error or no alarming when the negative pressure is abnormal occurs, thereby bringing potential safety hazard to users.
So the utility model provides a new scheme to solve the problem.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned condition, for overcoming prior art's defect, the utility model aims at providing an alarm device for VSD negative pressure drainage.
The technical scheme for solving the problem is as follows: the utility model provides an alarm device for VSD negative pressure drainage, includes the negative pressure bottle, negative pressure bottle top sets up pressure sensor and warning subassembly, the warning subassembly is including the signal conditioning circuit, threshold value comparison circuit and the early warning circuit that connect gradually, pressure sensor is used for detecting negative pressure bottle internal gas pressure size, and send detection signal into carry out LC filtering in the signal conditioning circuit and handle, and the signal after the LC filtering is sent into and is carried out the rapid amplification in the fortune ware AR1, sets up fortune ware AR2 simultaneously and carries out feedback output to fortune ware AR 1's homophase end to offset fortune and put input offset voltage, voltage signal after the fortune is put sends into compare with presetting safe atmospheric pressure value in the threshold value comparison circuit, and regard as the control signal drive with the signal of telecommunication after the comparison output early warning circuit work.
Further, the signal conditioning circuit comprises an inductor L1, one end of the inductor L1 is connected with the output end of the pressure sensor and one end of a resistor R1, the other ends of the inductor L1 and the resistor R1 are grounded through a capacitor C1 and are connected with one ends of a resistor R3 and a capacitor C3 through a resistor R2, the other end of the capacitor C3 is connected with the in-phase end of an operational amplifier AR1, the inverting end of the operational amplifier AR1 is connected with one ends of resistors R5 and R6 and the inverting end of an operational amplifier AR2, the other end of the resistor R5 is connected with the output end of an operational amplifier AR1, the other end of the resistor R6 is grounded, the in-phase end and the output end of the operational amplifier AR2 are connected with the other end of a resistor R3 and one end of a resistor R4 through a resistor R7 and a capacitor C2 in sequence.
Further, the inverting terminal of the operational amplifier AR3 of the threshold comparison circuit AR3 is connected to the output terminal of the operational amplifier AR1 through a resistor R10, the non-inverting terminal of the operational amplifier AR3 is connected to one ends of resistors R8 and R9 and the cathode of the zener diode DZ1, the other end of the resistor R8 is connected to a +5V power supply, and the other end of the resistor R9 and the anode of the zener diode DZ1 are grounded in parallel.
Further, the early warning circuit includes triode VT1, and the output of fortune amplifirer AR3 is connected to the base of triode VT1, and the +5V power is connected to the collecting electrode of triode VT1, and the projecting pole of triode VT1 is connected with the one end of resistance R11, R12, and the other end of resistance R11 is through pilot lamp LED1 ground connection, and the other end of resistance R12 is through alarm LS1 ground connection.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the utility model adopts the pressure sensor to detect the air pressure in the negative pressure bottle in real time, improves the accuracy of alarming in order to avoid the interference of external factors to pressure detection, designs a signal adjusting circuit to process the output signal of the pressure sensor, effectively reduces the interference of external environment and temperature to air pressure detection, and greatly improves the detection precision;
2. the air pressure detection value is compared with the safe air pressure threshold value by utilizing the comparator principle, and the electric potential signal is compared by the analog circuit to drive the early warning circuit to work, so that the phenomenon of alarming error of the digital voltmeter is effectively avoided, the anti-interference capability is strong, the timeliness and the reliability of early warning are improved, and the using effect is safer and more convenient.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings 1 to 2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The utility model provides an alarm device for VSD negative pressure drainage, includes negative pressure bottle 1, and 1 tops of negative pressure bottle set up pressure sensor 2 and alarm component 3. Alarm component 3 is including the signal conditioning circuit who connects gradually, threshold value comparison circuit and early warning circuit, pressure sensor 2 is used for detecting negative pressure bottle 1 internal gas pressure size, and send detected signal into and carry out LC filtering processing in the signal conditioning circuit, the signal after the LC filtering is sent into and is carried out the rapid amplification in fortune ware AR1, set up fortune ware AR2 simultaneously and carry out feedback output to fortune ware AR 1's homophase end to the offset voltage of fortune ware AR1 inverting terminal, thereby offset fortune and put the input offset voltage, voltage signal after fortune is put sends into in the threshold value comparison circuit and is compared with the safe atmospheric pressure value of presetting, and regard as control signal drive early warning circuit work with the signal of telecommunication after will comparing the output.
In order to avoid the interference of external factors on pressure detection and improve the accuracy of alarm, a signal regulating circuit is designed to process the output signal of the pressure sensor 2. The signal adjusting circuit comprises an inductor L1, one end of the inductor L1 is connected with the output end of the pressure sensor 2 and one end of a resistor R1, the other ends of the inductor L1 and the resistor R1 are grounded through a capacitor C1 and are connected with one ends of a resistor R3 and a capacitor C3 through a resistor R2, the other end of the capacitor C3 is connected with the in-phase end of an operational amplifier AR1, the inverting end of the operational amplifier AR1 is connected with one ends of resistors R5 and R6 and the inverting end of the operational amplifier AR2, the other end of the resistor R5 is connected with the output end of the operational amplifier AR1, the other end of the resistor R6 is grounded, the in-phase end and the output end of the operational amplifier AR2 are sequentially connected with the other ends of the resistor R3 and the resistor R4 through the resistor 686R 9 and the capacitor C2.
The inductor L1 and the capacitor C1 form an LC filter to perform noise reduction on the output signal of the pressure sensor 2, so that the interference of the external environment on pressure detection is effectively reduced. In order to increase the output signal strength of the pressure sensor 2, the signal is amplified by the amplifier AR1, so that the signal enhancement efficiency is improved. Because the signal is affected by factors such as temperature and the like in the amplification process and has zero drift interference, the offset voltage at the inverting terminal of the operational amplifier AR1 is fed back by the operational amplifier AR2 and is output to the inverting terminal of the operational amplifier AR1, and the input offset voltage of the operational amplifier is eliminated by utilizing the principle of inverting cancellation, so that the zero drift is eliminated, the accuracy of signal amplification is greatly improved, and the anti-interference performance of the device is improved. Wherein the capacitors C2, C3 function as signal coupling.
The signal amplified and output by the operational amplifier AR1 is sent to a threshold comparison circuit for comparison and output, the threshold comparison circuit is an operational amplifier AR3, the inverting end of the operational amplifier AR3 is connected with the output end of the operational amplifier AR1 through a resistor R10, the non-inverting end of the operational amplifier AR3 is connected with one ends of resistors R8 and R9 and the cathode of a voltage stabilizing diode DZ1, the other end of the resistor R8 is connected with a +5V power supply, and the other end of the resistor R9 and the anode of the voltage stabilizing diode DZ1 are grounded in parallel. The resistors R8 and R9 divide the voltage of the +5V power supply by using a voltage division principle, so that a threshold voltage is formed at the non-inverting terminal of the operational amplifier AR3, and the zener diode DZ1 stabilizes the threshold voltage. When the air pressure in the negative pressure bottle 1 is at a normal value, the output signal of the pressure sensor 2 is amplified and output by the operational amplifier AR1 and then is greater than the threshold voltage, so that the operational amplifier AR3 outputs a low level, and the early warning circuit does not work; when the air pressure in the negative pressure bottle 1 is abnormal and is lower than the safe low-pressure value, namely the voltage value of the output signal of the amplifier AR1 is smaller than the threshold voltage value, the output signal of the amplifier AR3 is converted from low level to high level, and therefore the early warning circuit is driven to work.
The early warning circuit comprises a triode VT1, the base electrode of the triode VT1 is connected with the output end of the operational amplifier AR3, the collector electrode of the triode VT1 is connected with a +5V power supply, the emitter electrode of the triode VT1 is connected with one ends of resistors R11 and R12, the other end of the resistor R11 is grounded through an indicator light LED1, and the other end of the resistor R12 is grounded through an alarm LS 1. When the operational amplifier AR3 outputs high level, the base of the triode VT1 is conducted, so that the indicator light LED1 and the alarm LS1 are powered on to work simultaneously, and an acousto-optic early warning signal is sent to inform a user that the air pressure in the negative pressure bottle 1 is abnormal, and the operation is stopped in time.
The utility model discloses when specifically using, 1 interior atmospheric pressure size of pressure sensor 2 real-time detection negative pressure bottle, in order to avoid external factors to pressure detection's interference, improve the degree of accuracy of reporting to the police, design signal conditioning circuit handles pressure sensor 2's output signal, effectively reduces external environment and temperature to atmospheric pressure detection's interference, has greatly improved the detection precision. The air pressure detection value is compared with the safe air pressure threshold value by utilizing the comparator principle, and the electric potential signal is compared by the analog circuit to drive the early warning circuit to work, so that the phenomenon of alarming error of the digital voltmeter is effectively avoided, the anti-interference capability is strong, the timeliness and the reliability of early warning are improved, and the using effect is safer and more convenient.
The above description is provided for further details of the present invention with reference to the specific embodiments, which should not be construed as limiting the present invention; to the utility model discloses affiliated and relevant technical field's technical personnel are based on the utility model discloses under the technical scheme thinking prerequisite, the extension of doing and the replacement of operating method, data all should fall within the utility model discloses within the protection scope.
Claims (4)
1. The utility model provides an alarm device for VSD negative pressure drainage, includes negative pressure bottle, its characterized in that: the negative pressure bottle top sets up pressure sensor and warning subassembly, the warning subassembly is including the signal conditioning circuit, threshold value comparison circuit and the early warning circuit that connect gradually, pressure sensor is used for detecting negative pressure bottle internal gas pressure size to send detected signal into carry out LC filtering processing among the signal conditioning circuit, the signal after the LC filtering is sent into and is carried out the rapid amplification in the fortune ware AR1, sets up fortune ware AR2 simultaneously and carries out feedback output to fortune ware AR 1's homophase end to the offset voltage of fortune ware AR1 inverting terminal, thereby offset fortune input offset voltage, voltage signal after fortune is put sends into compare with preset safe atmospheric pressure value in the threshold value comparison circuit, and regard as control signal drive the signal drive after comparing the output early warning circuit work.
2. The warning device for VSD negative pressure drainage of claim 1, wherein: the signal adjusting circuit comprises an inductor L1, one end of the inductor L1 is connected with the output end of the pressure sensor and one end of a resistor R1, the other ends of the inductor L1 and the resistor R1 are grounded through a capacitor C1 and are connected with one ends of a resistor R3 and a capacitor C3 through a resistor R2, the other end of the capacitor C3 is connected with the in-phase end of an operational amplifier AR1, the inverting end of the operational amplifier AR1 is connected with one ends of resistors R5 and R6 and the inverting end of the operational amplifier AR2, the other end of the resistor R5 is connected with the output end of the operational amplifier AR1, the other end of the resistor R6 is grounded, the in-phase end and the output end of the operational amplifier AR2 are sequentially connected with the other ends of the resistor R3 and the resistor R4 through the resistor 686R 9 and the capacitor C2, and.
3. The alarm device for VSD negative pressure drainage of claim 2, wherein: the reverse phase end of the operational amplifier AR3 of the threshold comparison circuit AR3 is connected with the output end of the operational amplifier AR1 through a resistor R10, the non-phase end of the operational amplifier AR3 is connected with one ends of resistors R8 and R9 and the cathode of a voltage stabilizing diode DZ1, the other end of the resistor R8 is connected with a +5V power supply, and the other end of the resistor R9 and the anode of the voltage stabilizing diode DZ1 are grounded in parallel.
4. The alarm device for VSD negative pressure drainage of claim 3, characterized in that: the early warning circuit comprises a triode VT1, the base electrode of the triode VT1 is connected with the output end of the operational amplifier AR3, the collector electrode of the triode VT1 is connected with a +5V power supply, the emitter electrode of the triode VT1 is connected with one ends of a resistor R11 and a resistor R12, the other end of the resistor R11 is grounded through an indicator light LED1, and the other end of the resistor R12 is grounded through an alarm LS 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922276814.9U CN210515623U (en) | 2019-12-17 | 2019-12-17 | Alarm device for VSD negative pressure drainage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922276814.9U CN210515623U (en) | 2019-12-17 | 2019-12-17 | Alarm device for VSD negative pressure drainage |
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| Publication Number | Publication Date |
|---|---|
| CN210515623U true CN210515623U (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922276814.9U Expired - Fee Related CN210515623U (en) | 2019-12-17 | 2019-12-17 | Alarm device for VSD negative pressure drainage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924353A (en) * | 2021-01-20 | 2021-06-08 | 北京理工大学 | Filter fault detection circuit, fault detection device and filter |
| CN114518192A (en) * | 2022-02-25 | 2022-05-20 | 黄河水利职业技术学院 | Detection circuit for mobile base station |
-
2019
- 2019-12-17 CN CN201922276814.9U patent/CN210515623U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924353A (en) * | 2021-01-20 | 2021-06-08 | 北京理工大学 | Filter fault detection circuit, fault detection device and filter |
| CN112924353B (en) * | 2021-01-20 | 2022-02-11 | 北京理工大学 | Filter fault detection circuit, fault detection device and filter |
| CN114518192A (en) * | 2022-02-25 | 2022-05-20 | 黄河水利职业技术学院 | Detection circuit for mobile base station |
| CN114518192B (en) * | 2022-02-25 | 2023-06-02 | 黄河水利职业技术学院 | Detection circuit for mobile base station |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200512 Termination date: 20201217 |