Vacuum arc-extinguishing chamber additionally provided with pressure sensor and metal reed and air leakage monitoring method of vacuum arc-extinguishing chamber

Abstract

The invention discloses a vacuum arc-extinguishing chamber additionally provided with a pressure sensor and a metal reed and an air leakage monitoring method thereof, and the air leakage monitoring device is partially disposed at a static end cover or a moving end cover of the vacuum arc-extinguishing chamber, and comprises the metal reed, a metal flange, a spring, the pressure sensor and a sensor assembly cylinder. The metal reed and the metal flange are welded to the static end cover plate or the movable end cover plate when the vacuum arc-extinguishing chamber is machined, one end of the spring is connected with the metal reed, the other end of the spring is connected with the pressure sensor, and the spring and the pressure sensor are installed in a sensor assembly cylinder fixed to the metal flange; and the metal reed, the metal flange and the vacuum arc-extinguishing chamber are processed into a whole. The vacuum arc-extinguishing chamber air leakage monitoring device has the air leakage monitoring function of the vacuum arc-extinguishing chamber under the operation working condition, and aims at accurately monitoring the air leakage condition of the vacuum arc-extinguishing chamber in real time, discovering vacuum degree abnormity in time and guaranteeing safe and stable operation of an electric power system. The method can be applied to the field of vacuum arc-extinguishing chamber air leakage monitoring.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vacuum interrupter gas leakage monitoring, and particularly relates to a vacuum interrupter with a pressure sensor and a metal reed and a gas leakage monitoring method thereof. BACKGROUND

[0002] As a key component of vacuum switch equipment, the vacuum interrupter has been widely used due to its excellent arc extinguishing performance. The performance of the vacuum interrupter is highly dependent on the vacuum degree inside the vacuum interrupter. Once gas leakage occurs, not only the breaking performance is lost, but also the safe operation of the power system is seriously threatened. Therefore, there is an urgent need in the field of vacuum switches for a method that can monitor the vacuum state inside the vacuum interrupter in real time.

[0003] At present, there is still no vacuum degree online monitoring technology that can be widely commercially applied in the field of vacuum switches. The operation reliability of many traditional vacuum degree online monitoring schemes cannot meet the needs of the vacuum interrupter, which makes the operation life of the vacuum interrupter one order of magnitude lower than the operation life of the vacuum interrupter, and is easily affected by external interference. Monitoring the value of the vacuum degree of the vacuum interrupter can more easily determine whether the vacuum interrupter is leaking, and the operation reliability of the monitoring can be significantly improved. SUMMARY

[0004] In order to solve the above technical problems, the application provides a vacuum interrupter with a pressure sensor and a metal reed and a gas leakage monitoring method thereof. The traditional vacuum interrupter structure is optimized and designed. A metal reed and a threaded metal flange are arranged at the static end cover or the dynamic end cover of the vacuum interrupter. A detachable sensor assembly containing a pressure sensor and a spring is connected to the metal flange through threads. When the vacuum interrupter is normally operated in the online circuit, the state of the metal reed (concave to the inside of the interrupter when not leaking, and flat after leaking) and the value change of the pressure sensor are observed in real time to determine whether the vacuum interrupter is leaking, thereby realizing the gas leakage monitoring of the vacuum interrupter.

[0005] To achieve the above purpose, the application adopts the following technical scheme:

[0006] A vacuum interrupter with a pressure sensor and a metal reed, comprising a vacuum interrupter main body and a gas leakage monitoring device, the gas leakage monitoring device is located at the static end cover 101 or the dynamic end cover 109 of the vacuum interrupter, and is composed of a metal reed 206, a spring 203, a pressure sensor 202, a sensor assembly cylinder 204, a metal flange 205 and a fixing bolt 201.

[0007] The metal reed 206 is welded at the static end cover 101 or the dynamic end cover 109 during the processing of the vacuum interrupter. In the initial state (when not leaking), the contact self-closing force is greater than the spring force, and the state is concave to the inside of the interrupter.

[0008] The metal flange 205 is brazed to the outer diameter of the metal spring 206 on the static end cover 101 or the moving end cover 109, and is internally provided with threads, facilitating connection with the sensor assembly cylinder 204; the mature vacuum brazing process is compatible with the original processing technology of the arc-extinguishing chamber, and is suitable for batch production.

[0009] The spring 203 is connected to the metal spring 206 at one end and connected to the pressure sensor 202 at the other end, and is used for transmitting the force change of the metal spring, and the elastic coefficient thereof needs to be accurately designed to match the contact self-closing force and the monitoring requirement.

[0010] The pressure sensor 202 and the spring 203 are arranged in the sensor assembly cylinder 204, the pressure sensor 202 has high-precision pressure detection and signal transmission functions, and can convert the spring elastic force change into an electric signal output; the fixing bolt 201 is used for stably fixing the pressure sensor 202 in the cylinder, ensuring stable force, and providing force for the pressure sensor, so as to transmit the spring force change.

[0011] The sensor assembly housing cylinder 204 is connected with the metal flange 205 through threads, and constitutes a detachable sensor assembly, facilitating installation during switch assembly or later maintenance and replacement, and simplifying the assembly process.

[0012] The monitoring method of the vacuum arc-extinguishing chamber gas leakage monitoring device with the added pressure sensor and the metal spring records the initial value of the pressure sensor 202 as a normal state reference value through the data transmission and display device before the vacuum arc-extinguishing chamber is put into operation. At this time, the vacuum degree in the vacuum arc-extinguishing chamber is normal, the contact self-closing force is greater than the spring force, the metal spring 206 is in a downward state, and the spring 203 is in an initial tension state. When the vacuum arc-extinguishing chamber works normally, the pressure sensor 202 continuously detects the pressure value corresponding to the spring elastic force of the spring 203 and transmits the pressure value to the data transmission and display device in real time. When the vacuum arc-extinguishing chamber leaks, the vacuum degree decreases, the contact self-closing force gradually decreases until it disappears, the metal spring 206 is popped up to a flat state, the length of the spring 203 changes, the spring elastic force changes, and the pressure sensor 202 detects the value change. The pressure sensor 202 converts the changed pressure value into an electric signal and transmits the electric signal to the data transmission and display device, and the display screen presents the value change. According to the value deviation from the initial reference value, the working personnel can judge that the vacuum arc-extinguishing chamber leaks, and then take measures such as maintenance, repair or replacement of the arc-extinguishing chamber, to avoid power system failure. The pressure sensor 202 is calibrated regularly to ensure the accuracy of the detection value; meanwhile, the connection integrity of the metal spring 206, the spring 203, the sensor assembly and the metal flange 205 is checked, and if there is looseness, deformation or other abnormalities, timely repair or replacement is performed, to ensure long-term reliable monitoring function.

[0013] Compared with the prior art, the present application has the following advantages:

[0014] 1) Through the cooperation of the metal spring and the spring and the pressure sensor, the contact self-closing force change caused by the gas leakage of the vacuum arc-extinguishing chamber is accurately captured, the real-time monitoring of the gas leakage condition is realized, compared with the traditional scheme, the timeliness of monitoring is effectively improved, the vacuum degree abnormality can be found in time, and the fault expansion is avoided.

[0015] 2) Through the threaded connection design of the metal flange and the detachable sensor assembly, the compatibility of the original batch production process of the arc-extinguishing chamber is reserved, and convenient assembly and maintenance and replacement of the sensor assembly are realized, the problems of difficult installation and high maintenance cost of the traditional monitoring device caused by fixed structure are solved, and the industrial production and actual operation and maintenance requirements are more suitable.

[0016] 3) The gas leakage monitoring method is not easy to be disturbed and affected by external conditions, is only closely related to the vacuum degree condition in the vacuum arc-extinguishing chamber, and the accuracy and anti-interference of monitoring are improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a plane schematic view of the prior art vacuum arc-extinguishing chamber under operation condition;

[0018] Figure 2 is a plane schematic view of the vacuum arc-extinguishing chamber of the present application under operation condition in a normal state;

[0019] Figure 3 is a plane schematic view of the vacuum arc-extinguishing chamber of the present application under operation condition in a gas leakage state. DETAILED DESCRIPTION

[0020] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0021] As shown in the drawings, Figure 2 The vacuum arc-extinguishing chamber structure of the present application is provided with a pressure sensor and a metal spring, which comprises a static end cover 101, a dynamic end cover 109, a static end conductive rod and contact structure 103, a main shielding cover 104, an arc-extinguishing chamber porcelain shell 105, a corrugated pipe shielding cover 106, a corrugated pipe 107, a dynamic end conductive rod and contact structure 108, a vacuum arc-extinguishing chamber main part, a fixed bolt 201, a pressure sensor 202, a spring 203, a sensor assembly cylinder 204, a metal flange 205 and a metal spring 206, and a gas leakage monitoring device part.

[0022] Among them, the vacuum arc-extinguishing chamber main part is like the prior art vacuum arc-extinguishing chamber. Figure 1

[0023] ​In the machining stage of the static end cover 101 of the vacuum interrupter, the metal spring 206 (stainless steel material) is precisely welded at the predetermined position. The material is selected as the same stainless steel as the bellows to adapt to the high temperature environment of the vacuum interrupter and ensure the stability and elasticity in the vacuum environment. At the same time, the metal flange 205 is brazed on the outer diameter of the metal spring 206 on the static end cover 101. The brazing technology compatible with the original process of the vacuum interrupter is adopted to ensure the welding strength and sealing performance, avoid affecting the vacuum environment of the vacuum interrupter due to welding, and adapt to the batch production demand.

[0024] Assemble the sensor assembly: connect one end of the spring 203 to the metal spring 206 and the other end to the pressure sensor 202. Then put both of them into the sensor assembly cylinder 204. Fix the pressure sensor 202 with the fixing bolt 201 to ensure that the pressure sensor 202, spring 203 and metal spring 206 are coaxial, and the force acts in a straight line.

[0025] Adjust the initial state of the spring: after the sensor cylinder 204 is screwed into the metal flange 205, the spring 203 is initially in the original length state, which ensures that the metal spring 206 is initially not affected by the spring force and is in a downward state. The installation of the sensor assembly is completed.

[0026] After the vacuum interrupter is assembled and before it is put into operation, start the data transmission and display device, record the initial value of the pressure sensor 202, and take the average value as the reference value of the normal state after multiple collection. At the same time, adjust the sensitivity, range and other parameters of the pressure sensor to match the monitoring requirements.

[0027] After the vacuum interrupter is connected to the power system and put into operation, the pressure sensor 202 collects spring force data in real time, which is transmitted to the display device for dynamic display. The operation and maintenance personnel regularly check the value on the display screen, or set the automatic alarm threshold (such as a certain percentage deviation from the initial reference value). When the pressure value changes abnormally due to gas leakage or the metal spring 206 pops up to a flat state, the alarm prompt is triggered in time.

[0028] As shown in Figure 3 If the vacuum interrupter has a gas leakage fault, the metal spring 206 pops up to a flat state, and the pressure sensor 202 value changes abnormally, the operation and maintenance personnel detect the vacuum interrupter offline when the pressure value is abnormal or the metal spring pops up, confirm the gas leakage, and replace the faulty interrupter.

[0029] In conclusion, the application provides a vacuum arc-extinguishing chamber with a pressure sensor and a metal spring piece and a gas leakage monitoring method thereof, the threaded metal flange and the detachable sensor assembly are arranged on the static end cover of the arc-extinguishing chamber, so that the monitoring of the gas leakage condition of the vacuum arc-extinguishing chamber is realized in a simple manner, the structure is simple, the cost is low, the maintenance is convenient, the index is clear, the abnormality of the vacuum degree of the vacuum arc-extinguishing chamber can be reflected in time, and the safety of the power system is ensured.

[0030] The application is not limited to the above preferred embodiments, and those skilled in the art can modify and change the application according to the teaching of the application. All these modifications and changes shall fall within the protection scope of the application.

Claims

1. A vacuum interrupter equipped with a pressure sensor and a metal spring, comprising a main body of the vacuum interrupter and a leakage monitoring device, characterized in that: The leakage monitoring device is located at the stationary end cover (101) or the moving end cover (109) of the vacuum interrupter, and includes a metal spring (206), a spring (203), a pressure sensor (202), a sensor assembly cylinder (204), a metal flange (205), and a fixing bolt (201). The metal spring (206) is welded to the stationary end cover (101) or the moving end cover (109) during the processing of the vacuum interrupter. In the initial state, i.e., when there is no leakage, the self-closing force of the vacuum interrupter is greater than the force of the spring (203), so the metal spring (206) is concave towards the inside of the interrupter. The metal flange (205) is brazed to the outer diameter of the metal spring (206) on the stationary end cover (101) or the moving end cover (109), and has internal threads. The pressure sensor (202) and the spring (203) are placed inside the sensor assembly cylinder (204). 03) One end is connected to the metal spring (206), and the other end is connected to the pressure sensor (202); the sensor assembly cylinder (204) is connected to the metal flange (205) by threads, and the fixing bolt (201) is used to fix the pressure sensor (202) inside the sensor assembly cylinder (204); the metal spring (206), the metal flange (205) and the vacuum interrupter are processed into a whole, and the sensor assembly consisting of the spring (203), the pressure sensor (202) and the sensor assembly cylinder (204) is a detachable structure.

2. A vacuum interrupter chamber equipped with a pressure sensor and a metal spring according to claim 1, characterized in that: The pressure sensor 202 is coaxial with the spring 203 and the metal reed 206, and the force acts on a straight line.

3. A vacuum interrupter chamber equipped with a pressure sensor and a metal spring according to claim 1, characterized in that: The metal spring (206) is made of the same stainless steel as the bellows.

4. A vacuum interrupter chamber equipped with a pressure sensor and a metal spring according to claim 1, characterized in that: The main body of the vacuum interrupter includes a stationary end portion, a moving end portion, and a shell portion; the stationary end portion includes a stationary end conductive rod and contact structure (103) and a stationary end cover (101); the moving end portion includes a moving end conductive rod and contact structure (108) and a moving end cover (109), and the moving end conductive rod and contact structure (108) is connected to the lower cover plate of the interrupter through a bellows (107); the shell portion includes an interrupter ceramic shell (105), a bellows shield (106) disposed on the upper side of the bellows (107), and a main shield (104) disposed inside the interrupter ceramic shell (105) and surrounding the stationary end conductive rod and contact structure (103) and the moving end conductive rod and contact structure (108).

5. The method for monitoring leakage in a vacuum interrupter according to any one of claims 1 to 4, characterized in that: When the vacuum interrupter is working normally and there is no leakage, the self-closing force of the contacts is greater than the spring force, and the metal spring (206) is concave towards the inside of the vacuum interrupter. The spring is in its initial state, i.e., stretched or at its original length. The pressure sensor (202) detects and records the initial pressure value. When the vacuum interrupter leaks, the vacuum level decreases, causing the self-closing force of the contacts to decrease until it disappears. During this process, the metal spring (206) springs up to a flat state, the length of the spring (203) changes, the elastic force of the spring (203) changes, and the pressure sensor (202) detects the change in pressure value. The pressure sensor (202) converts the changed pressure value into an electrical signal and transmits it to the data transmission and display device. The change in value is displayed on the screen, and the staff can judge whether the vacuum interrupter is leaking and take maintenance measures accordingly.

6. The leakage detection method according to claim 5, characterized in that: Before the vacuum interrupter is put into operation, the initial value of the pressure sensor needs to be recorded as a reference value for normal operation through a data transmission and display device.

7. The leakage detection method according to claim 5, characterized in that: The pressure sensor (202) should be calibrated regularly, and the connection integrity of the metal spring (206), spring (203), sensor assembly cylinder (204) and metal flange (205) should be checked. Any abnormal parts should be repaired or replaced in a timely manner.

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