A sulfur hexafluoride quantitative detection system

Abstract

The present invention relates to the field of gas detection technology, and in particular to a sulfur hexafluoride quantitative detection system, comprising a housing and a sulfur hexafluoride sensor disposed in the housing, the housing being provided with an air inlet channel for injecting the gas to be detected, the air inlet channel being provided with a centrifugal air pump, the sulfur hexafluoride sensor being wrapped with an elastic airbag, an air inlet being provided at the lower end of the housing, the housing being provided with an annular surface above the air inlet, the centrifugal air pump comprising a motor system, the motor system comprising a motor housing, a stator, and a rotor, the stator being provided in the motor housing, a support bearing for supporting the weight of the rotor being provided between the rotor and the motor housing, a base for fixing the motor in a vertical position being provided below the motor housing, the support bearing being a magnetic support bearing comprising two repelling magnets, one located at the bottom and the other being a permanent magnet located above the magnet and fixed to the rotor shaft. The system reduces measurement fluctuations and improves the accuracy of sulfur hexafluoride detection.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, in particular to a sulfur hexafluoride detection system. Background Art

[0002] Sulfur hexafluoride is colorless, odorless, and non-toxic, with extremely stable chemical properties. It possesses insulation and arc-extinguishing properties unmatched by ordinary dielectrics. As an insulating arc-extinguishing medium, it is widely used to extinguish arcs in electrical transmission and distribution equipment in substations. Because sulfur hexafluoride gas has a density approximately five times that of natural gas, large amounts of it released into the working environment can accumulate below substations, causing oxygen levels to drop. If the oxygen content in the area falls below 16%, workers in this area can suffer from asphyxiation. Quantitative testing for sulfur hexafluoride can accurately measure the gas concentration, providing a specific quantitative value that helps assess risks and formulate countermeasures.

[0003] However, when quantitatively detecting sulfur hexafluoride, it is necessary to inhale external gas to detect the content of sulfur hexafluoride in the gas. However, vibration will be generated during the inhalation process, and the vibration will be transmitted to the inside of the sulfur hexafluoride detection system, causing fluctuations in the detection data and affecting the accuracy of the measurement. Summary of the Invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the invention.

[0005] In view of the above problems existing in the prior art, the present invention is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A sulfur hexafluoride quantitative detection system includes a housing and a sulfur hexafluoride sensor disposed in the housing;

[0008] The housing is provided with an air inlet channel for injecting the gas to be detected, and the air inlet channel is provided with a centrifugal air pump for driving the gas flow;

[0009] The air inlet channel is provided with an air inlet and an air injection port, and the housing is also provided with an air outlet;

[0010] The sulfur hexafluoride sensor is wrapped with an airbag, and the airbag is an elastic airbag;

[0011] The airbag is provided with a gas inlet and an outlet, the inlet is communicated with the gas injection port, and the outlet is communicated with the gas outlet;

[0012] The housing is vertically arranged on the ground for operation, and the air inlet is arranged at the lower end of the housing;

[0013] A bracket supporting the shell is provided on the lower side of the shell;

[0014] The housing is provided with an annular surface above the air inlet, and the annular surface is an inverted cone-shaped structure with a lower middle portion and gradually rising edges;

[0015] The annular surface adopts a folding surface mechanism in the style of a folding umbrella;

[0016] The radius of the annular surface is greater than 10 cm;

[0017] The centrifugal air pump further includes a support frame mounted in the air inlet passage;

[0018] The centrifugal air pump includes a motor system;

[0019] The motor system includes a motor housing, a stator, and a rotor, and the motor housing is installed in a support frame;

[0020] The stator is arranged in the motor housing;

[0021] The rotor is placed vertically, and is provided with a rotor shaft, which is in a vertical working state;

[0022] A support bearing for supporting the weight of the rotor is directly or indirectly provided between the rotor and the motor housing, and a base for fixing the motor in a vertical position is provided below the motor housing;

[0023] The support bearing is a magnetic support bearing, which includes two repelling magnets, one magnet is located at the bottom, and the other magnet is a permanent magnet located above the magnet and fixed on the rotor shaft.

[0024] In this design, gas enters the inlet channel from the inlet and is injected into the inlet of the elastic airbag through the injection port. The elastic airbag acts as an elastic, closed container, buffering air pressure and stabilizing flow and pressure, thereby improving detection stability.

[0025] The shell is vertically set on the ground for operation, and the air inlet of the shell is located at the bottom, which adapts to the characteristics of sulfur hexafluoride having high density and deposition and accumulation on the ground. It is convenient for the air inlet to absorb sulfur hexafluoride gas close to the ground, thereby improving the accuracy of real-time monitoring of sulfur hexafluoride in the environment.

[0026] The magnetic support bearing achieves suspended support for the rotor, reducing mechanical contact, friction, and vibration transmission. This reduces the vibration generated by the centrifugal air pump during operation, and thus reduces the vibration transmitted to the internal sulfur hexafluoride detection system, reducing test data fluctuations and improving the accuracy of sulfur hexafluoride measurement.

[0027] The sulfur hexafluoride gas will sink steadily, and the annular surface will form a gas-guiding structure, providing an environment for the airflow to enter the air inlet below the annular surface, assisting the air inlet in attracting gas at a lower position, and enhancing the purity and probability of the sinking sulfur hexafluoride gas entering the air inlet.

[0028] The annular surface adopts a folding surface mechanism in the style of a folding umbrella, which facilitates the folding of the annular surface and the recovery of the entire device.

[0029] The gas can enter the shell through the space supported by the bracket, which simplifies the design of the gas inlet, facilitates air flow, and facilitates the collection of naturally settled sulfur hexafluoride.

[0030] Preferably, the lower end of the middle portion of the annular surface is 1-2 cm away from the air inlet, and the angle between the annular surface and the horizontal plane is not less than 130 degrees. An angle greater than 130 degrees ensures that the annular surface has good airflow guidance capabilities and can capture a large amount of gas samples in the environment. The lower end of the middle portion of the annular surface is 1-2 cm away from the air inlet, ensuring that the annular surface effectively helps the air inlet attract gas below the annular surface around the housing.

[0031] Preferably, the elastic airbag has a set expansion pressure, and begins to expand when the pressure is greater than the expansion pressure, and the expansion pressure is set to 0.01-0.03MPa; the maximum pressure range of the elastic airbag is not greater than 0.05MPa; and the pressure inside the elastic airbag is maintained at 0.01-0.03MPa through elastic expansion; the volume of the elastic airbag is 10-30cm 3 The elastic airbag's 0.01-0.03 MPa expansion pressure helps maintain stable air pressure during SF6 sensor measurements, preventing fluctuations in measurement data due to sudden changes in gas pressure, thereby improving measurement accuracy. The airbag's small volume allows for faster gas flow, ensuring good gas flow and a quick response, which improves sensitivity and response time. By managing gas pressure and flow, the stability of the measurement environment is ensured, thereby improving the accuracy of test data.

[0032] Preferably, the device further comprises an airtight circuit board, the sulfur hexafluoride sensor is fixed on the circuit board, and the area covered by the elastic airbag is more than twice the area of ​​the sulfur hexafluoride sensor;

[0033] An airtight ceramic ring bracket is provided below the elastic airbag, and the height of the ceramic ring bracket is twice the height of the sulfur hexafluoride sensor;

[0034] The lower edge of the elastic airbag is fixed to the upper end of the ceramic ring bracket, and a closed space is formed by the ceramic ring bracket, the elastic airbag, and the airtight circuit board;

[0035] The area covered by the elastic airbag is more than twice the area of ​​the sulfur hexafluoride sensor, and the ceramic ring bracket isolates the heat conduction of the sulfur hexafluoride sensor to prevent the elastic airbag from being aged due to heat;

[0036] The elastic airbag is lifted by a ceramic ring bracket to prevent the elastic airbag from touching the sensing surface of the sulfur hexafluoride sensor after the elastic airbag loses pressure.

[0037] The ceramic ring bracket, elastic airbag, and airtight circuit board form a sealed space to prevent gas leakage and external contamination, improving detection stability. The ceramic ring bracket isolates the sulfur hexafluoride sensor from heat conduction, protecting the elastic airbag from thermal aging and extending its service life. The elastic airbag's protective covering reduces the effects of mechanical shock and vibration on the sulfur hexafluoride sensor.

[0038] Preferably, the airbag is an elastic airbag made of silicone material. Silicone has excellent high temperature resistance, high elasticity and softness, can effectively absorb vibration and impact, and protect the sulfur hexafluoride sensor.

[0039] Preferably, it further comprises a temperature control system, wherein the temperature control system is provided with a temperature sensor, and a heat sensing end of the temperature sensor extends into the air intake passage;

[0040] The temperature control system further includes a heating wire system and a water cooling system arranged outside the air inlet channel, wherein a heat insulating layer is provided between the heating unit of the heating wire system and the water cooling unit of the water cooling system;

[0041] The water cooling system includes a heat exchanger, which is arranged outside the housing;

[0042] The heating unit of the heating wire system covers the location where the centrifugal air pump is installed;

[0043] The water cooling unit of the water cooling system covers the location where the centrifugal air pump is installed;

[0044] The air intake channel is also provided with heat exchange fins, and the heat exchange fins run through the inner and outer sides of the air intake channel.

[0045] The temperature sensor transmits the measured temperature data to the temperature control system's microprocessor. Based on the actual temperature, the microprocessor controls the heating wire system to heat the air intake duct or the water cooling system to cool it. The sensing end of the temperature sensor extends into the air intake duct to monitor the gas or ambient temperature, reducing fluctuations in the sulfur hexafluoride quantitative detection system caused by temperature fluctuations. This prevents temperature changes from affecting the performance of the magnetic support bearing, thereby ensuring the magnetic stability of the magnetic support bearing and improving the stability and accuracy of the system.

[0046] Preferably, the air inlet channel is further provided with a convergence structure, the convergence structure is provided with a convergence surface of an arc surface, and the convergence port on the convergence surface is connected with the air injection port;

[0047] The centrifugal air pump further comprises a centrifugal impeller, and the convergent structure is arranged above the centrifugal impeller;

[0048] The heat exchange fins below the centrifugal impeller extend in a straight line;

[0049] The heat exchange fins above the centrifugal impeller extend in a spiral line, the spiral direction of the spiral line is consistent with the rotation direction of the stator, and the heat exchange fins extending in the spiral line extend to the outer shell in front of the convergent structure above the air inlet.

[0050] The diameter of the inlet channel at the centrifugal impeller is at least three times greater than the diameter of the convergence port. By providing a convergence structure to centrally direct gas through the gas injection port into the airbag, the convergence structure accelerates the gas, ensuring that the sensor detecting sulfur hexafluoride can quickly and stably collect gas samples, helping to improve detection response speed and concentration measurement stability.

[0051] The heat exchange fins above the centrifugal impeller extend in a spiral line, allowing the airflow to flow in a spiral to the convergence structure, facilitating the formation of a spiral flow between the centrifugal impeller and the convergence port, promoting uniform mixing and smooth outflow of the gas, reducing dead zones and eddies, and also reducing the impact of the airflow, thereby reducing the vibration caused by the airflow movement and improving the stability of the detected concentration.

[0052] Preferably, the upper end of the rotor shaft passes through the centrifugal impeller, and a locking magnetic suspension support is further provided above the motor housing;

[0053] The locking magnetic suspension support includes a magnet mechanism set on the motor housing, called the fixed magnet;

[0054] The locking magnetic suspension support further includes a rotating mechanism that rotates relative to the motor housing, wherein the rotating mechanism is provided with a magnet mechanism that repels the fixed magnet, called a rotating magnet, and the rotating magnet is fixed to the rotor shaft;

[0055] The rotating magnet and the fixed magnet are both arranged around the rotation axis of the rotor shaft;

[0056] There are two fixed magnets, and the two fixed magnets are arranged in a two-layer structure, and at least part of the rotating magnet is sandwiched between the two layers;

[0057] The two fixed magnets and the rotating magnet sandwiched between the two fixed magnets both generate a repulsive magnetic force;

[0058] The locking magnetic suspension support further includes an auxiliary permanent magnet disposed between the two fixed magnets;

[0059] The auxiliary permanent magnet generates a repulsive magnetic force with the rotating magnet.

[0060] The centrifugal impeller is kept in suspension by locking its magnetic suspension supports, which also lock the impeller to reduce vibration. An auxiliary permanent magnet, positioned between the two fixed magnets, enhances the magnetic field or provides additional repulsion. This auxiliary permanent magnet generates a repulsive force with the rotating magnet, further stabilizing the rotor. This reduces vibration transmitted to the SF6 detection system, improving SF6 measurement accuracy.

[0061] Preferably, the centrifugal impeller is arranged above the rotor, and a second locking magnetic suspension support is provided between the stator and the rotor, so as to further ensure the stability of the centrifugal impeller's rotation.

[0062] Preferably, the support frame is made of ceramic, and a rubber pad is placed between the support frame and the outer magnetic ring. The ceramic support frame ensures the stability of the support, and the ceramic will not affect the magnetic structure of the magnetic support bearing or the locking magnetic suspension support.

[0063] In summary, the present invention has the following beneficial effects:

[0064] The present invention employs an elastic airbag to buffer air pressure, stabilize flow, and stabilize pressure. Magnetic bearings are used to achieve suspended support for the rotor, reducing mechanical contact, friction, and vibration transmission, thereby improving detection stability. The housing is vertically positioned above ground for operation, with the air inlet located below. This adapts to the high density of sulfur hexafluoride, which accumulates on the ground. Combined with the annular surface, the air inlet draws sulfur hexafluoride gas from the surrounding area of ​​the housing. This reduces vibration transmission into the sulfur hexafluoride detection system and improves the accuracy of sulfur hexafluoride measurements. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive work. Among them:

[0066] Figure 1 Schematic diagram of the internal structure of a sulfur hexafluoride quantitative detection system of the present invention;

[0067] Figure 2 This is a schematic diagram of the appearance and structure of a sulfur hexafluoride quantitative detection system of the present invention;

[0068] Figure 3 This is a schematic diagram of the internal structure of a sulfur hexafluoride quantitative detection system of the present invention.

[0069] In the figure, 1. outer shell; 11. air outlet; 12. annular surface; 13. bracket; 2. air inlet channel; 21. air inlet; 22. air injection port; 3. sulfur hexafluoride sensor; 4. elastic airbag; 5. centrifugal air pump; 51. centrifugal impeller; 52. magnetic support bearing; 6. support frame; 7. heat exchange fins; 8. convergence structure; 9. ceramic annular bracket; 10. airtight circuit board. DETAILED DESCRIPTION

[0070] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0071] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0072] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, these schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0073] Furthermore, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in less than one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it necessarily refer to a single embodiment or a selective embodiment that is mutually exclusive of other embodiments.

[0074] Example 1, reference Figure 1 and Figure 2 A sulfur hexafluoride quantitative detection system includes a housing 1 and a sulfur hexafluoride sensor 3 arranged in the housing 1.

[0075] The housing 1 is provided with an air inlet channel 2 for injecting the gas to be detected, and the air inlet channel 2 is provided with a centrifugal air pump 5 for driving the gas flow;

[0076] The air inlet channel 2 is provided with an air inlet 21 and an air injection port 22, and the housing 1 is also provided with an air outlet 11;

[0077] The sulfur hexafluoride sensor 3 is wrapped with an airbag, which is an elastic airbag 4;

[0078] The airbag is provided with a gas inlet and an outlet, the inlet is connected to the gas injection port 22, and the outlet is connected to the gas outlet 11;

[0079] The housing 1 is vertically arranged on the ground for operation, and the air inlet 21 is arranged at the lower end of the housing 1;

[0080] A bracket 13 supporting the housing 1 is provided on the lower side of the housing 1;

[0081] The housing 1 is provided with an annular surface 12 above the air inlet 21. The annular surface 12 is an inverted cone-shaped structure with a lower middle portion and gradually rising edges.

[0082] The annular surface 12 adopts a folding surface mechanism in the style of a folding umbrella;

[0083] The radius of the annular surface 12 is greater than 10 cm;

[0084] The centrifugal air pump 5 further includes a support frame 6 installed in the air inlet channel 2;

[0085] The centrifugal air pump 5 includes a motor system;

[0086] The motor system includes a motor housing, a stator, and a rotor, and the motor housing is installed in the support frame 6;

[0087] The stator is arranged in the motor housing;

[0088] The rotor is placed vertically and is provided with a rotor shaft, which is in a vertical working state;

[0089] A support bearing for supporting the weight of the rotor is directly or indirectly provided between the rotor and the motor housing, and a base for fixing the motor in a vertical position is provided under the motor housing;

[0090] The support bearing is a magnetic support bearing 52 , which includes two repelling magnets, one of which is located at the bottom and the other is a permanent magnet located above the magnet and fixed on the rotor shaft.

[0091] In the above design, gas enters the air inlet channel 2 from the air inlet 21 and is injected into the inlet of the elastic airbag 4 through the air injection port 22. The elastic airbag 4 acts as an elastic closed container to buffer air pressure, stabilize flow and pressure, and help improve the stability of detection.

[0092] The shell 1 is vertically arranged on the ground for operation, and the air inlet 21 of the shell 1 is located at the bottom, which adapts to the characteristics of sulfur hexafluoride having high density and deposition and accumulation on the ground. The air inlet 21 is convenient for absorbing sulfur hexafluoride gas close to the ground, thereby improving the accuracy of real-time monitoring of sulfur hexafluoride in the environment.

[0093] The magnetic support bearing 52 provides suspended support for the rotor, reducing mechanical contact, friction, and vibration transmission. This reduces the vibration generated by the centrifugal air pump 5 during operation, thereby reducing the vibration transmitted to the internal sulfur hexafluoride detection system, reducing fluctuations in detection data, and improving the accuracy of sulfur hexafluoride measurement.

[0094] The sulfur hexafluoride gas will sink steadily, and the annular surface 12 forms an air-guiding structure, providing an air flow lower than the annular surface 12 to enter the air inlet 21 to introduce the environment, assisting the air inlet 21 to attract gas at a lower position, and enhancing the contact efficiency between the sulfur hexafluoride gas and the sulfur hexafluoride sensor 3.

[0095] The annular surface 12 adopts a folding surface mechanism in the style of a folding umbrella, which makes it easy to fold up the annular surface 12 and thus to recycle the entire device.

[0096] The gas can enter the housing 1 through the space supported by the bracket 13, which simplifies the design of the gas inlet, facilitates air flow, and facilitates the collection of naturally settled sulfur hexafluoride.

[0097] Preferably, the distance between the lower end of the middle portion of the annular surface 12 and the air inlet 21 is 1-2 cm, and the angle between the annular surface 12 and the horizontal plane is not less than 130 degrees. An angle greater than 130 degrees ensures that the annular surface 12 has good airflow guidance capabilities and can capture more gas samples in the environment. The distance between the lower end of the middle portion of the annular surface 12 and the air inlet 21 is 1-2 cm, ensuring that the annular surface 12 effectively helps the air inlet 21 to attract gas from the surrounding area of ​​the housing below the annular surface 12.

[0098] Preferably, the elastic airbag 4 has a set expansion pressure, and begins to expand when the pressure is greater than the expansion pressure, and the expansion pressure is set to 0.01-0.03MPa; the maximum pressure range of the elastic airbag 4 is not greater than 0.05MPa; and then through elastic expansion, the pressure in the elastic airbag 4 is maintained at 0.01-0.03MPa; the volume of the elastic airbag is 10-30cm 3 The elastic airbag's expansion pressure of 40.01-0.03 MPa helps maintain stable air pressure during SF6 sensor 3 measurements, preventing fluctuations in measurement data due to sudden changes in gas pressure, thereby improving measurement accuracy. The airbag's small volume allows for faster gas flow, ensuring good gas flow and a quick response, which improves sensitivity and response time. By managing gas pressure and flow, the stability of the measurement environment is ensured, thereby improving the accuracy of test data.

[0099] Preferably, it further comprises an airtight circuit board 10, the sulfur hexafluoride sensor 3 is fixed on the circuit board, and the area covered by the elastic airbag 4 is more than twice the area of ​​the sulfur hexafluoride sensor 3;

[0100] An airtight ceramic ring bracket 9 is provided below the elastic airbag 4. The height of the ceramic ring bracket 9 is twice the height of the sulfur hexafluoride sensor 3.

[0101] The lower edge of the elastic airbag 4 is fixed to the upper end of the ceramic ring bracket 9, and a closed space is formed by the ceramic ring bracket 9, the elastic airbag 4, and the airtight circuit board 10;

[0102] The area covered by the elastic airbag 4 is more than twice the area of ​​the sulfur hexafluoride sensor 3, and the ceramic annular bracket 9 isolates the heat conduction of the sulfur hexafluoride sensor 3, thereby preventing the elastic airbag 4 from being aged due to heat;

[0103] Furthermore, the elastic airbag 4 is lifted by the ceramic annular support 9 to prevent the elastic airbag 4 from touching the sensing surface of the sulfur hexafluoride sensor 3 after the elastic airbag 4 loses pressure.

[0104] The ceramic ring bracket 9, the elastic airbag 4, and the airtight circuit board 10 form a sealed space, preventing gas leakage and external contamination, thereby improving detection stability. The ceramic ring bracket 9 isolates the sulfur hexafluoride sensor from heat conduction, preventing thermal aging of the elastic airbag and extending its service life. The protective covering of the elastic airbag 4 reduces the effects of mechanical shock or vibration on the sulfur hexafluoride sensor 3.

[0105] Preferably, the airbag is an elastic airbag 4 made of silicone material. Silicone has excellent high temperature resistance, high elasticity and softness, can effectively absorb vibration and impact, and protect the sulfur hexafluoride sensor 3.

[0106] During operation, when the sulfur hexafluoride sensor 3 is operating, the folding surface mechanism of the annular surface 12 opens, guiding the gas surrounding the housing 1 into the air inlet 21. The motor system operates, and the centrifugal air pump 5 draws in air from the outside. The support bearings between the rotor and the motor housing are magnetic support bearings 52, which reduce the vibration generated by the centrifugal air pump 5 during operation. The housing 1 is vertically arranged on the ground, and the air inlet 21 of the housing 1 is located at the bottom. This adapts to the high density of sulfur hexafluoride and its accumulation on the ground. This facilitates the air inlet 21 to absorb sulfur hexafluoride gas near the ground, improving the accuracy of real-time monitoring of sulfur hexafluoride in the environment. Gas enters the air inlet channel 2 from the air inlet 21 and is injected into the inlet of the elastic airbag 4 through the gas injection port 22. The elastic airbag 4 acts as an elastic closed container, maintaining the pressure within the elastic airbag 4 at 0.01-0.03MP, buffering the air pressure, stabilizing the flow and pressure, and absorbing some vibration. This helps to improve the stability of sulfur hexafluoride detection.

[0107] Example 2, reference Figure 1 and Figure 3 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0108] The system also includes a temperature control system equipped with a temperature sensor, the heat-sensing end of which extends into the air intake passage 2. The system also includes a heating wire system and a water cooling system disposed outside the air intake passage 2, with an insulating layer disposed between the heating unit of the heating wire system and the cooling unit of the water cooling system. The water cooling system includes a heat exchanger disposed outside the housing 1. The heating unit of the heating wire system covers the location where the centrifugal air pump 5 is installed. The cooling unit of the water cooling system covers the location where the centrifugal air pump 5 is installed. The air intake passage 2 is also equipped with heat exchange fins 7, which extend through both the interior and exterior of the air intake passage 2. The temperature sensor transmits the measured temperature data to the microprocessor system of the temperature control system. The microprocessor system controls the heating wire system to heat the air intake passage 2 or controls the water cooling system to cool the air intake passage 2 based on the actual temperature. The sensing end of the temperature sensor extends into the air inlet channel 2 to monitor the gas or ambient temperature, reduce the detection fluctuation of the sulfur hexafluoride quantitative detection system caused by temperature fluctuations, and prevent temperature changes from affecting the performance of the magnetic support bearing 52, thereby ensuring the magnetic stability of the magnetic support bearing 52 and improving the stability and accuracy of the system.

[0109] The housing 1 is provided with an annular surface 12, which is an inverted conical structure with a lower center and gradually rising edges. The lower end of the annular surface 12 is provided with an opening facing the air inlet 21. The radius of the annular surface 12 is greater than 10 cm. This facilitates the efficient collection of surrounding sulfur hexafluoride. The sulfur hexafluoride sinks in the air, increasing its concentration and improving the capture rate. This facilitates efficient collection of sulfur hexafluoride, prevents omissions, and improves overall detection efficiency. Heat exchange fins 7 enhance heat exchange efficiency inside and outside the air inlet channel 2, helping to quickly adjust the airflow temperature.

[0110] The air inlet channel 2 is also provided with a convergence structure 8, which is provided with a convergence surface in the form of an arc, and the convergence port on the convergence surface is connected to the gas injection port 22; the centrifugal air pump 5 also includes a centrifugal impeller 51, and the convergence structure 8 is provided above the centrifugal impeller 51; the heat exchange fins 7 below the centrifugal impeller 51 extend in a straight line; the heat exchange fins 7 above the centrifugal impeller 51 extend in a spiral line, and the spiral direction of the spiral line is consistent with the rotation direction of the stator. The heat exchange fins 7 extended in the spiral line extend to the front shell 1 of the convergence structure 8 above the air inlet 21. The diameter of the air inlet channel 2 at the centrifugal impeller 51 is at least three times greater than the diameter of the convergence port. By providing the convergence structure 8 to guide the gas into the airbag through the gas injection port 22, the convergence structure 8 can realize gas acceleration, ensuring that the sensor for detecting sulfur hexafluoride can quickly and stably collect gas samples, which helps to improve the response speed of the detection and the stability of the concentration measurement. The heat exchange fins 7 above the centrifugal impeller 51 extend in a spiral line, causing the airflow to flow in a spiral to the convergence structure 8, facilitating the formation of a spiral flow between the centrifugal impeller 51 and the convergence port, promoting uniform mixing and smooth outflow of the gas, reducing dead zones and eddies, and reducing the impact of the airflow, thereby reducing the vibration caused by the airflow movement and improving the stability of the detected concentration.

[0111] The upper end of the rotor shaft passes through the centrifugal impeller 51. A locking magnetic levitation support is also installed above the motor housing. The locking magnetic levitation support includes a magnet mechanism mounted on the motor housing, referred to as a fixed magnet. The locking magnetic levitation support also includes a rotating mechanism that rotates relative to the motor housing. The rotating mechanism is equipped with a magnet mechanism that repels the fixed magnet, referred to as a rotating magnet. The rotating magnet is fixed to the rotor shaft. Both the rotating magnet and the fixed magnet are arranged around the rotation axis of the rotor shaft. Two fixed magnets are arranged in a two-layer structure, with at least a portion of the rotating magnet sandwiched between the two layers. The two fixed magnets generate a repulsive magnetic force against the rotating magnet sandwiched between the two fixed magnets. The locking magnetic levitation support also includes an auxiliary permanent magnet positioned between the two fixed magnets. The auxiliary permanent magnet and the rotating magnet generate a repulsive magnetic force. The locking magnetic levitation support ensures the centrifugal impeller 51 is suspended and locked to reduce vibration. The auxiliary permanent magnet is positioned between the two fixed magnets to enhance the magnetic field or provide additional repulsive force. This auxiliary permanent magnet generates a repulsive magnetic force with the rotating magnet, further stabilizing the rotor. This reduces vibration transmitted into the SF6 detection system and improves the accuracy of SF6 measurement.

[0112] The centrifugal impeller 51 is arranged above the rotor, and a second locking magnetic suspension support is provided between the stator and the rotor to further ensure the stability of the rotation of the centrifugal impeller 51.

[0113] The support frame 6 is made of ceramic, and a rubber pad is placed between the support frame 6 and the outer magnetic ring. The ceramic support frame 6 ensures the stability of the support, and the ceramic will not affect the magnetic support bearing 52 or the magnetic structure of the locking magnetic suspension support.

[0114] During use, the temperature control system monitors the gas temperature, heats the gas in the air intake channel 2 through the heating wire system, or reduces the gas in the air intake channel 2 through the water cooling system, thereby reducing the detection fluctuations of the sulfur hexafluoride quantitative detection system caused by temperature fluctuations, and improving the heat exchange efficiency through the heat exchange fins 7.

[0115] The gas in the inlet channel 2 is propelled by the centrifugal impeller 51, driving the gas along the air inlet 21 into the air intake duct. The heat exchange fins 7 above the centrifugal impeller 51 extend in a spiral, facilitating the spiral flow of the airflow to the converging structure 8. This improves the efficiency of heat exchange with the air, thereby controlling the stable temperature of the airflow. This facilitates the formation of a spiral flow between the centrifugal impeller 51 and the converging port, promoting uniform mixing of the gas, reducing dead zones and eddies, and allowing the gas to flow smoothly out of the converging port. This reduces the impact of the airflow and thus the vibration caused by airflow movement, thereby improving the stability of the detected concentration. The converging structure 8 can accelerate the gas, ensuring that the sensor detecting sulfur hexafluoride can quickly and stably collect gas samples. The arc-shaped converging surface reduces the impact of the airflow caused by structural changes. The gas flowing out of the converging port is injected into the inlet of the elastic airbag 4 through the gas injection port 22. This reduces the sudden changes or impacts of the airflow during circulation, thereby improving the vibration within the elastic airbag 4 caused by airflow impact and improving the accuracy of sulfur hexafluoride measurement.

[0116] The centrifugal impeller 51 is kept in suspension by locking its magnetic suspension supports, which also reduces vibration. An auxiliary permanent magnet, positioned between the two fixed magnets, enhances the magnetic field or provides additional repulsive force. This auxiliary permanent magnet generates a repulsive force with the rotating magnet, further stabilizing the rotor. This reduces vibration transmitted to the SF6 detection system and improves SF6 measurement accuracy.

[0117] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A sulfur hexafluoride quantitative detection system, comprising a housing (1) and a sulfur hexafluoride sensor (3) disposed in the housing (1), characterized in that: An air inlet channel (2) for injecting the gas to be detected is provided in the housing (1), and a centrifugal air pump (5) for driving the flow of the gas is provided in the air inlet channel (2); The air inlet channel (2) is provided with an air inlet (21) and an air injection port (22), and the housing (1) is also provided with an air outlet (11); The sulfur hexafluoride sensor (3) is wrapped with an airbag, and the airbag is an elastic airbag (4); The elastic airbag (4) is provided with a gas inlet and a gas outlet, the inlet is communicated with the gas injection port (22), and the outlet is communicated with the gas outlet (11); The housing (1) is vertically arranged on the ground for operation, and the air inlet (21) is arranged at the lower end of the housing (1); A bracket (13) supporting the housing (1) is provided on the lower side of the housing (1); The housing (1) is provided with an annular surface (12) above the air inlet (21), and the annular surface (12) is an inverted conical structure with a lower middle portion and gradually rising edges. The annular surface (12) adopts a folding surface mechanism in the style of a folding umbrella; The radius of the annular surface (12) is greater than 10 cm; The centrifugal air pump (5) further includes a support frame (6) installed in the air inlet channel (2); The centrifugal air pump (5) includes a motor system; The motor system comprises a motor housing, a stator, and a rotor, wherein the motor housing is mounted in a support frame (6); The stator is arranged in the motor housing; The rotor is placed vertically, and is provided with a rotor shaft, which is in a vertical working state; A support bearing for supporting the weight of the rotor is directly or indirectly provided between the rotor and the motor housing, and a base for fixing the motor in a vertical position is provided below the motor housing; The support bearing is a magnetic support bearing (52), which includes two repelling magnets, one magnet being a magnet located at the bottom, and the other magnet being a permanent magnet located above the magnet and fixed on the rotor shaft.

2. The sulfur hexafluoride quantitative detection system according to claim 1, characterized in that: The distance between the lower end of the middle portion of the annular surface (12) and the air inlet (21) is 1-2 cm; The opening angle between the annular surface (12) and the horizontal plane is not less than 130 degrees.

3. The sulfur hexafluoride quantitative detection system according to claim 1, characterized in that: The elastic airbag (4) has a set expansion pressure and starts to expand when the pressure is greater than the expansion pressure, and the expansion pressure is set to 0.01-0.03 MPa; The maximum pressure bearing range of the elastic airbag (4) is not greater than 0.05 MPa; Then, the pressure in the elastic airbag (4) is maintained at 0.01-0.03 MPa through elastic expansion; The volume of the elastic airbag is 10-30cm 3 .

4. The sulfur hexafluoride quantitative detection system according to claim 3, characterized in that: It also includes an airtight circuit board (10), the sulfur hexafluoride sensor (3) is fixed on the circuit board, and the area covered by the elastic airbag (4) is more than twice the area of ​​the sulfur hexafluoride sensor (3); An airtight ceramic ring bracket (9) is provided below the elastic airbag (4), and the height of the ceramic ring bracket (9) is twice the height of the sulfur hexafluoride sensor (3); The lower edge of the elastic airbag (4) is fixed to the upper end of the ceramic annular bracket (9), and a closed space is formed by the ceramic annular bracket (9), the elastic airbag (4), and the airtight circuit board (10); The area covered by the elastic airbag (4) is more than twice the area of ​​the sulfur hexafluoride sensor (3), and the ceramic ring bracket (9) isolates the heat conduction of the sulfur hexafluoride sensor (3), thereby preventing the elastic airbag (4) from being aged due to heat; Furthermore, the elastic airbag (4) is lifted by the ceramic annular bracket (9) to prevent the elastic airbag (4) from touching the sensing surface of the sulfur hexafluoride sensor (3) after the elastic airbag (4) loses pressure.

5. The sulfur hexafluoride quantitative detection system according to claim 1, characterized in that: The airbag is an elastic airbag (4) made of silicone material.

6. The sulfur hexafluoride quantitative detection system according to claim 1, characterized in that: It also includes a temperature control system, wherein the temperature control system is provided with a temperature sensor, and the heat sensing end of the temperature sensor extends into the air intake channel (2); The temperature control system further comprises an electric heating wire system and a water cooling system arranged outside the air inlet channel (2), wherein a heat insulating layer is provided between the heating unit of the electric heating wire system and the water cooling unit of the water cooling system; The water cooling system comprises a heat exchanger, and the heat exchanger is arranged outside the housing (1); The heating unit of the heating wire system covers the location where the centrifugal air pump (5) is installed; The water cooling unit of the water cooling system covers the location where the centrifugal air pump (5) is installed; The air intake channel (2) is further provided with heat exchange fins (7), and the heat exchange fins (7) run through both the inner and outer sides of the air intake channel (2).

7. The sulfur hexafluoride quantitative detection system according to claim 6, characterized in that: The air inlet channel (2) is further provided with a convergence structure (8), the convergence structure (8) being provided with a convergence surface having an arc surface, and the convergence port on the convergence surface being in communication with the air injection port (22); The centrifugal air pump (5) further comprises a centrifugal impeller (51), and the convergent structure (8) is arranged above the centrifugal impeller (51); The heat exchange fins (7) below the centrifugal impeller (51) extend in a straight line; The heat exchange fins (7) above the centrifugal impeller (51) extend in a spiral line, the spiral direction of the spiral line is consistent with the rotation direction of the stator, and the heat exchange fins (7) extending in the spiral line extend to the front shell (1) of the convergence structure (8) above the air inlet (21).

8. The sulfur hexafluoride quantitative detection system according to claim 7, characterized in that: The upper end of the rotor shaft passes through the centrifugal impeller (51), and a locking magnetic suspension support is also provided above the motor housing; The locking magnetic suspension support includes a magnet mechanism set on the motor housing, called the fixed magnet; The locking magnetic suspension support further includes a rotating mechanism that rotates relative to the motor housing, wherein the rotating mechanism is provided with a magnet mechanism that repels the fixed magnet, called a rotating magnet, and the rotating magnet is fixed to the rotor shaft; The rotating magnet and the fixed magnet are both arranged around the rotation axis of the rotor shaft; There are two fixed magnets, and the two fixed magnets are arranged in a two-layer structure, and at least part of the rotating magnet is sandwiched between the two layers; The two fixed magnets and the rotating magnet sandwiched between the two fixed magnets both generate a repulsive magnetic force; The locking magnetic suspension support further includes an auxiliary permanent magnet disposed between the two fixed magnets; The auxiliary permanent magnet generates a repulsive magnetic force with the rotating magnet.

9. The sulfur hexafluoride quantitative detection system according to claim 1, characterized in that: The support frame (6) is a ceramic support frame (6), and a rubber pad is provided between the support frame (6) and the outer magnetic ring.

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