SF6 gas sensing device based on ultrasonic absorption principle
Through the SF6 gas sensing device based on the principle of ultrasonic absorption, the existing sulfur hexafluoride sensors have been solved, and high-sensitivity and low-cost sulfur hexafluoride gas detection is achieved, which is suitable for safety monitoring of electrical equipment.
Patent Information
- Application Number
- CN202421948231.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-08-12
AI Technical Summary
The current sulfur hexafluoride sensor has insufficient sensitivity and working stability, and is costly.
The SF6 gas sensing device based on the principle of ultrasonic absorption is adopted. The ambient air is sent into the gas detection chamber through the air supply mechanism, and the ultrasonic transmitter and receiver are used to detect the concentration of sulfur hexafluoride gas, and the controller and alarm are combined to achieve high sensitivity and stability.
It realizes rapid reaction, high sensitivity, stable operation and low cost sulfur hexafluoride gas detection, and is suitable for monitoring sulfur hexafluoride leakage in electrical equipment.
Smart Images
Figure CN223284174U_ABST
Abstract
Description
Technical field
[0001] The utility model relates to an SF6 gas sensing device based on the ultrasonic absorption principle. [Background Technology]
[0002] Sulfur hexafluoride (SF6) is widely used as an insulating and arc-extinguishing medium in medium-voltage, high-voltage, and ultra-high-voltage electrical equipment. However, SF6 is a colorless, odorless, and non-toxic inert gas heavier than air, making it immiscible with air. While pure SF6 is non-toxic to humans, it cannot sustain life. SF6 is a simple asphyxiant. Exposure to an atmosphere with an O2 content of less than 19.5% can cause dizziness, coma, increased salivation, slowed reflexes, nausea, vomiting, loss of consciousness, and even death. Exposure to an atmosphere with an O2 content of less than 12% can cause unconsciousness without warning, rendering one unable to self-rescue. Therefore, SF6 sensors are installed near these electrical equipment to monitor concentrations and detect leaks, issuing timely alarms. However, current SF6 sensors suffer from low sensitivity, unstable operation, and high cost.
[0003] Therefore, it is necessary to make further improvements. [Utility Model Content]
[0004] The purpose of this utility model is to overcome the above problems. We provide an SF6 gas sensing device based on the principle of ultrasonic absorption, which has the advantages of high sensitivity and stable operation.
[0005] To achieve the above objectives, we provide an SF6 gas sensing device based on the ultrasonic absorption principle, which includes a casing, a controller, an air supply mechanism, an ultrasonic transmitter and an ultrasonic receiver. The casing defines a gas inspection chamber and an air supply channel. The air supply mechanism is installed in the air supply channel. The air outlet end of the air supply channel is connected to the gas inspection chamber. The gas inspection chamber is provided with an air outlet. The ultrasonic transmitter is arranged at the right end of the gas inspection chamber, and the ultrasonic receiver is arranged at the left end of the gas inspection chamber. The air outlet end of the air supply channel is connected to the right end of the gas inspection chamber, and the air outlet of the gas inspection chamber is arranged at a position close to its left end. The controller is electrically connected to the ultrasonic transmitter, ultrasonic receiver and air supply mechanism.
[0006] In one or more embodiments, the air supply channel is located below the gas inspection chamber, the air inlet of the air supply channel is provided on the bottom surface of the casing, and an air inlet grille is provided on the air inlet.
[0007] In one or more embodiments, a partition is provided between the air supply channel and the gas inspection chamber, and a plurality of air inlet holes are distributed on the partition.
[0008] In one or more embodiments, the air outlet of the gas inspection chamber is arranged on the top or side of the casing, and the air outlet is composed of a plurality of small air outlet holes.
[0009] In one or more embodiments, mounting portions are provided on the left and right side surfaces of the housing, and strip-shaped holes are provided on the mounting portions for the fixing belt to pass through.
[0010] In one or more embodiments, an alarm is provided on the housing, and the alarm is electrically connected to the controller.
[0011] Compared with the background technology, the utility model has the following technical effects: the gas sensing device can actively send ambient air into the gas detection chamber to detect the concentration of sulfur hexafluoride gas, and uses ultrasonic wave to detect the concentration of sulfur hexafluoride, which has the advantages of fast response speed, high sensitivity, stable operation and low cost.
Brief Description of the Drawings
[0012] Figure 1 This is a schematic structural diagram of the SF6 gas sensing device according to an embodiment of the present utility model. [Specific implementation method]
[0013] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.
[0014] Please see Figure 1 The present application provides an SF6 gas sensing device based on the ultrasonic absorption principle, which includes a housing 1, a controller 2, an air supply mechanism 3, an ultrasonic transmitter 4, and an ultrasonic receiver 5. The housing defines a gas detection chamber 6 and an air supply channel 7. The air supply mechanism is installed in the air supply channel. The air outlet end of the air supply channel is connected to the gas detection chamber. The gas detection chamber 6 is provided with an air outlet. The ultrasonic transmitter 4 is provided at the right end of the gas detection chamber, and the ultrasonic receiver 5 is provided at the left end of the gas detection chamber. The air outlet end of the air supply channel 7 is connected to the right end of the gas detection chamber, and the air outlet of the gas detection chamber 6 is provided at a position near its left end. The controller 2 is electrically connected to the ultrasonic transmitter, the ultrasonic receiver, and the air supply mechanism. Specifically, the air supply mechanism draws external air into the gas detection chamber, the ultrasonic transmitter emits ultrasonic waves, the ultrasonic receiver obtains the ultrasonic signal, and transmits the signal to the controller through an operational amplifier. The controller thereby obtains the transmission time and signal strength of the ultrasonic wave, thereby determining whether there is sulfur hexafluoride gas in the air and the concentration of sulfur hexafluoride gas. It should be noted that sulfur hexafluoride is a gas with a relatively high density, which will affect the duration of ultrasonic transmission and cause the ultrasonic signal to attenuate.
[0015] The air supply channel 7 is located below the gas inspection chamber 6. The air inlet of the air supply channel is provided on the bottom surface of the casing 1. An air inlet grille 8 is provided on the air inlet. The air inlet grille can prevent larger objects from entering the air supply channel, and can also prevent parts of the human body from entering the air supply channel and being scratched by the air supply mechanism. The air supply mechanism preferably adopts a fan.
[0016] A partition is provided between the air supply channel 7 and the gas inspection chamber 6 , and a plurality of air inlet holes 9 are distributed on the partition. The plurality of air inlet holes are specifically evenly distributed so that air can evenly enter the gas inspection chamber.
[0017] The air outlet of the gas inspection chamber 6 is arranged on the top or side of the casing. The air outlet is composed of multiple air outlet holes 10. The multiple air outlet holes can constitute the function of an air outlet grille, which can not only discharge air stably and evenly, but also prevent foreign matter from entering the gas inspection chamber.
[0018] The left and right sides of the housing 1 are provided with mounting parts 11, which are provided with strip holes 12 for the fixing belt to pass through. The strip holes can be used for the elastic belt to pass through to install and fix the SF6 gas sensor device, and can also be used for screw installation.
[0019] The housing 1 is provided with an alarm, which is electrically connected to the controller. The alarm is a photoelectric alarm. When the controller receives ultrasonic signal feedback and determines that the SF6 gas concentration is too high or SF6 gas is present, the alarm will sound an alarm.
[0020] The above description is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the content disclosed in the present invention should be included in the protection scope recorded in the claims.
Claims
1. An SF6 gas sensing device based on the ultrasonic absorption principle, characterized by: The invention comprises a housing (1), a controller (2), an air supply mechanism (3), an ultrasonic transmitter (4) and an ultrasonic receiver (5); an air inspection chamber (6) and an air supply channel (7) are defined inside the housing; the air supply mechanism is installed in the air supply channel; the air outlet end of the air supply channel is connected to the air inspection chamber; the air inspection chamber (6) is provided with an air outlet; the ultrasonic transmitter (4) is arranged at the right end of the air inspection chamber; the ultrasonic receiver (5) is arranged at the left end of the air inspection chamber; the air outlet end of the air supply channel (7) is connected to the right end of the air inspection chamber; the air outlet of the air inspection chamber (6) is arranged at a position close to the left end thereof; the controller (2) is electrically connected to the ultrasonic transmitter, the ultrasonic receiver and the air supply mechanism.
2. The SF6 gas sensing device based on the ultrasonic absorption principle according to claim 1, characterized in that: The air supply channel (7) is located below the gas inspection chamber (6), and the air inlet of the air supply channel is arranged on the bottom surface of the casing (1), and an air inlet grille (8) is arranged on the air inlet.
3. The SF6 gas sensing device based on the ultrasonic absorption principle according to claim 1, characterized in that: A partition is provided between the air supply channel (7) and the gas inspection chamber (6), and a plurality of air inlet holes (9) are distributed on the partition.
4. The SF6 gas sensing device based on ultrasonic absorption principle according to claim 1, characterized in that: The air outlet of the gas inspection chamber (6) is arranged on the top or side of the casing, and the air outlet is composed of a plurality of air outlet holes (10).
5. The SF6 gas sensing device based on ultrasonic absorption principle according to claim 1, characterized in that: The left and right side surfaces of the housing (1) are provided with mounting portions (11), and the mounting portions are provided with strip-shaped holes (12) for the fixing belt to pass through.
6. The SF6 gas sensing device based on ultrasonic absorption principle according to claim 1, characterized in that: The housing (1) is provided with an alarm, which is electrically connected to the controller.