SF6 micro-water density sensor

Abstract

The utility model relates to the technical field of sensors, in particular to an SF6 (sulfur hexafluoride) micro-water density sensor which comprises a main gas connecting head, transfer hoses and branch gas connecting heads which are sequentially connected, the main gas connecting head is connected with the transfer hoses in a one-to-many manner, the transfer hoses are connected with the branch gas connecting heads in a one-to-one manner, and the branch gas connecting heads are connected with sensor shells in a one-to-one manner; the sensor shell is provided with a connector socket, the back of the sensor shell is connected with a mounting seat, and the mounting seat is connected with a detachable heat preservation housing; a micro-water measuring module and a density measuring module are arranged in the sensor shell and are electrically communicated with the connector socket; according to the utility model, a one-to-many structure is arranged to form multiple guarantees, the fault rate is effectively reduced, the measurement accuracy is improved, the installation position is flexible and variable, and the device is suitable for the conditions of limited installation space and high wiring difficulty; the influence of the temperature on the measurement precision is effectively reduced, and even in a low-temperature environment, the stable work of the micro-water measurement module and the density measurement module can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to SF6 micro water density sensors. Background Technology

[0002] In power systems, SF6 gas is widely used in electrical equipment such as high-voltage switchgear and instrument transformers due to its excellent insulation and arc-extinguishing properties. However, increased moisture content in SF6 gas or gas leaks can lead to decreased insulation performance, affecting the safe operation of GIS (Gas Insulation System). Therefore, real-time monitoring of the moisture content and density of SF6 gas is necessary. Existing SF6 moisture density sensors have some structural design shortcomings. For example, installation in confined spaces is difficult, wiring is complex, and wire ends are prone to detachment, posing safety hazards. In low-temperature environments, the sensor is susceptible to temperature fluctuations, leading to decreased measurement accuracy. Installation in locations prone to mechanical vibration may damage internal components, affecting performance and resulting in inaccurate measurements. Therefore, developing an SF6 moisture density sensor with optimized structure, stable performance, and adaptability to complex operating conditions is of great significance. Summary of the Invention

[0003] The purpose of this utility model is to overcome the above-mentioned existing technical problems and provide a new type of SF6 micro water density sensor to solve the problems of existing sensors in terms of installation flexibility, temperature adaptability, and working stability, so as to achieve flexible installation at multiple points, improve measurement accuracy in low temperature environments, and enhance the shock resistance during installation.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] The SF6 micro water density sensor includes a main air inlet, a transfer hose, and a branch air inlet connected in sequence. The main air inlet is connected to multiple transfer hoses in a one-to-one manner, the transfer hose is connected to a branch air in a one-to-one manner, and the branch air inlet is connected to a sensor housing in a one-to-one manner.

[0006] The sensor housing is provided with a wiring socket, and a mounting base is connected to the back of the sensor housing. A detachable heat insulation cover is connected to the mounting base.

[0007] Furthermore, the sensor housing is equipped with a micro-water measurement module and a density measurement module, which are electrically connected to a wiring socket.

[0008] Furthermore, the sensor housing includes a first housing and a second housing connected vertically, the support air head is connected to one end of the second housing, and the wiring socket is located at the end of the first housing away from the second housing.

[0009] Furthermore, the heat insulation cover has a recessed cavity on the side near the mounting base to accommodate the sensor housing, and the space formed by the recessed cavity and the mounting base has three openings; an electric heating wire is embedded inside the heat insulation cover.

[0010] Furthermore, the number of the transfer hoses is ≥2, and the length of each transfer hose is 5cm to 30cm.

[0011] Furthermore, the transfer hose is surrounded by a heat insulation layer.

[0012] Furthermore, the edge of the mounting base is provided with mounting screw holes.

[0013] Furthermore, a shock-absorbing corrugated ring is fitted inside the mounting screw hole, and a fixing screw passes through the shock-absorbing corrugated ring.

[0014] Furthermore, the damping corrugated ring has a compressible flange on each of the two sides of the mounting base.

[0015] The beneficial effects of adopting the technical solution of this utility model are:

[0016] 1. The SF6 micro water density sensor disclosed in this utility model has a one-to-many structure to form multiple protections, effectively reducing the failure rate and improving the measurement accuracy. The installation position is flexible and variable, and it is suitable for situations with limited installation space and high wiring difficulty.

[0017] 2. The SF6 micro-moisture density sensor disclosed in this utility model is equipped with a heat-insulating cover to effectively reduce the influence of temperature on the sensor's measurement accuracy. Even in low-temperature environments, it can ensure the stable operation of the micro-moisture measurement module and the density measurement module, thereby improving measurement accuracy.

[0018] 3. The SF6 micro water density sensor mounting base disclosed in this utility model can effectively absorb vibrations at the installation location, protect the precision components inside the sensor, extend the service life of the sensor, and improve its reliability in complex working environments. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 Schematic diagram of the sensor housing, mounting base, and insulation cover. Figure 1 ;

[0023] Figure 4 Schematic diagram of the sensor housing, mounting base, and insulation cover. Figure 2 ;

[0024] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure at point B.

[0025] Marked in the image:

[0026] 1. Main air connector; 2. Transfer hose; 3. Support air connector; 4. Sensor housing; 4a. Wiring socket; 4b. First housing; 4c. Second housing; 5. Mounting base; 6. Insulation cover; 7. Vibration damping corrugated ring; 7a. Flange; 8. Fixing screw. Detailed Implementation

[0027] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the terms "upper", "lower", "inner", "outer", etc. used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the technical solutions of this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] like Figures 1-5 As shown, the SF6 micro-water density sensor, in an embodiment, includes a main air inlet 1, a transfer hose 2, and a branch air inlet 3 connected in sequence. The main air inlet 1 is connected to multiple transfer hoses 2, the transfer hose 2 is connected to a branch air inlet 3, and the branch air inlet 3 is connected to a sensor housing 4. This connection method can form multiple safeguards, effectively reducing the failure rate. The installation position of the sensor housing 4 is flexible and variable, suitable for situations with limited installation space and high wiring difficulty.

[0029] A wiring socket 4a is provided on the sensor housing 4. A mounting base 5 is connected to the back of the sensor housing 4. A detachable heat-insulating cover 6 is connected to the mounting base 5. A cavity for accommodating the sensor housing 4 is provided on the side of the heat-insulating cover 6 near the mounting base 5. The space formed by the cavity and the mounting base 5 has three openings. An electric heating wire is embedded in the heat-insulating cover 6. In low-temperature environments, the temperature inside the sensor housing 4 can be maintained by heating with the electric heating wire, thereby improving the measurement accuracy. Temperature changes may cause changes in the density of SF6 gas, thus affecting the measurement accuracy of the sensor. If the sensor does not have temperature compensation, measurement errors are likely to occur.

[0030] The sensor housing 4 houses a micro-moisture measurement module and a density measurement module. The micro-moisture measurement module typically employs either an alumina capacitive sensor or a polymer thin-film capacitive sensor. The former utilizes the change in capacitance after the alumina film absorbs moisture, while the latter relies on the change in capacitance caused by the change in dielectric constant due to moisture absorption of the polymer material. This allows for accurate measurement of micro-moisture content. The density measurement module uses pressure and temperature sensors, measuring pressure and temperature respectively, and then calculates the gas density based on the ideal gas law. Both the micro-moisture measurement module and the density measurement module are electrically connected to a wiring socket 4a, enabling the transmission of the measured micro-moisture content and density data to external devices for analysis and processing.

[0031] The sensor housing 4 includes a first housing 4b and a second housing 4c that are vertically connected. The gas connector 3 is connected to one end of the second housing 4c. The wiring socket 4a is located at the end of the first housing 4b away from the second housing 4c. This structural design makes the gas inlet and signal output independent of each other, avoiding interference, and also facilitates installation and maintenance.

[0032] The number of transfer hoses 2 is ≥2, and the length of each transfer hose 2 is 5cm to 30cm. The length can be flexibly selected according to the actual installation scenario. The transfer hose 2 is surrounded by a heat insulation layer to further reduce the temperature change of the gas during transmission and ensure the accuracy of the measurement data.

[0033] The mounting base 5 has mounting screw holes on its edge, and a shock-absorbing corrugated ring 7 is fitted into the mounting screw holes. A fixing screw 8 passes through the shock-absorbing corrugated ring 7. The shock-absorbing corrugated ring 7 has a compressible flange 7a on each side of the mounting base 5. When external vibration occurs, the flange 7a can be compressed and deformed to absorb vibration energy, play a shock-absorbing and buffering role, and protect the internal components of the sensor from damage.

[0034] Work process:

[0035] When it is necessary to detect the micro-water density of SF6 gas, SF6 gas enters from the main gas inlet 1, and enters each sensor housing 4 through the transfer hose 2 and the branch gas inlet 3.

[0036] The micro-water measurement module and density measurement module inside the sensor housing 4 detect the incoming gas and measure the micro-water content and density in the gas, respectively.

[0037] The measured data is transmitted to an external data processing device, such as a monitoring computer, via an electrical connection with the wiring socket 4a, for data analysis and display.

[0038] In low-temperature environments, the electric heating wire inside the insulation cover 6 is energized and heats up to keep the sensor housing 4 warm, ensuring that the micro-water measurement module and density measurement module work in a suitable temperature environment and guaranteeing the accuracy of the measurement data.

[0039] When there is vibration at the installation location, the flanges 7a on both sides of the damping bellows 7 undergo compression deformation, absorbing vibration energy, reducing the impact of vibration on the internal components of the sensor, and ensuring the normal operation of the sensor.

[0040] The above embodiments based on this utility model are provided for guidance. Through the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. Any modifications or equivalent substitutions made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A SF6 micro-water density sensor characterized by: It includes a main air inlet (1), a transfer hose (2) and a branch air inlet (3) connected in sequence. The main air inlet (1) is connected to the transfer hose (2) in a one-to-many manner. The transfer hose (2) is connected to the branch air inlet (3) in a one-to-one manner. The branch air inlet (3) is connected to the sensor housing (4) in a one-to-one manner. The sensor housing (4) is provided with a wiring socket (4a), and a mounting base (5) is connected to the back of the sensor housing (4). A detachable heat insulation cover (6) is connected to the mounting base (5).

2. The SF6 micro-water density sensor of claim 1, wherein: The sensor housing (4) is equipped with a micro water measurement module and a density measurement module, which are electrically connected to the wiring socket (4a).

3. The SF6 micro-water density sensor of claim 2, wherein: The sensor housing (4) includes a first housing (4b) and a second housing (4c) connected vertically. The support air head (3) is connected to one end of the second housing (4c). The wiring socket (4a) is located at the end of the first housing (4b) away from the second housing (4c).

4. The SF6 micro-water density sensor of claim 3, wherein: The heat insulation cover (6) has a recessed cavity on the side near the mounting base (5) to accommodate the sensor housing (4). The space formed by the recessed cavity and the mounting base (5) has three openings. An electric heating wire is embedded in the heat insulation cover (6).

5. The SF6 micro-water density sensor of claim 1, wherein: The number of transit hoses (2) is ≥2, and the length of each transit hose (2) is 5cm to 30cm.

6. The SF6 micro-water density sensor of claim 5, wherein: The transfer hose (2) is surrounded by a heat insulation layer.

7. The SF6 micro-water density sensor of claim 1, wherein: The mounting base (5) has mounting screw holes on its edge.

8. The SF6 micro-water density sensor of claim 7, wherein: A shock-absorbing corrugated ring (7) is fitted inside the mounting screw hole, and a fixing screw (8) passes through the shock-absorbing corrugated ring (7).

9. The SF6 micro-water density sensor of claim 8, wherein: The shock-absorbing corrugated ring (7) has a compressible flange (7a) on each side of the mounting base (5).

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