A mounting structure of a GIS device monitoring sensor

Abstract

The application provides a kind of installation structure of GIS equipment monitoring sensor, comprising: structure main body, first channel, second channel and third channel are arranged inside, first channel is parallel with third channel and is located at the same height, second channel is located between first channel and third channel and is perpendicular to first channel;Upper cover, including valve flap and valve rod, valve flap moves along the axial direction of second channel under the driving of valve rod, to separate / connect first channel and third channel;Covered with rear cover of structure main body rear end;Limiting buckle, two ends are connected with structure main body and rear cover respectively;When first channel and third channel are communicated, sensor passes through third channel and first channel in turn and extends into GIS equipment interior;Sensor is equipped with first clamping groove and second clamping groove respectively matched with limiting buckle, to limit the position of sensor in GIS equipment interior.The application can realize sensor extension into GIS equipment interior measurement and sensor replacement without affecting GIS equipment operation.

Description

Technical Field

[0001] This invention relates to the field of power condition monitoring technology, and more specifically, to an installation structure for a GIS equipment monitoring sensor. Background Technology

[0002] Gas-Insulated Switchgear (GIS) is a type of integrated electrical equipment that encloses circuit breakers, disconnectors, grounding switches, current transformers, voltage transformers, surge arresters, busbars, etc., in a grounded metal shell filled with 0.4-0.6 MPa SF6 gas for insulation and arc extinguishing. Due to its high reliability, long maintenance cycle, and small footprint, GIS equipment has seen widespread application in recent years. However, with the increase in the number of operational devices and their operating time, the risk of equipment failure also increases. If operation and maintenance personnel fail to detect potential faults in a timely manner, it could potentially lead to power grid accidents, threatening people's lives and property. The safety of GIS equipment is directly related to the purity of SF6 gas. Existing SF6 gas monitoring technologies within GIS mainly fall into two categories: offline monitoring methods, which rely on gas sampling and analysis to determine whether the SF6 gas levels meet operational requirements. This method is highly dependent on personnel and cannot guarantee the timely detection of early faults. Another type is the online monitoring method, which mainly relies on installing corresponding sensors on GIS equipment to monitor the purity of SF6 gas.

[0003] Chinese invention patent application number CN201510877169.X relates to a gas-insulated metal-enclosed switchgear and its gas density monitoring device. The gas density monitoring device includes a monitoring gas path corresponding to a three-phase gas chamber. A density relay is installed on the monitoring gas path. Three vent connectors are connected in series on the monitoring gas path corresponding to the three-phase gas chambers. Each vent connector has a chamber connection section for connecting to the corresponding phase gas chamber, and each vent connector's chamber connection section has an on / off valve. When it is necessary to monitor the density of the gas in a single-phase gas chamber, the on / off valves on the vent connectors corresponding to the other two gas chambers can be closed, cutting off the connection between the other two phase gas chambers and the monitoring gas path, thus achieving density monitoring of the gas inside the single-phase gas chamber. During monitoring, it is not necessary to frequently disassemble the corresponding gas path connections, effectively ensuring the airtightness of the connections and facilitating the operation of single-phase gas chamber density monitoring.

[0004] Chinese utility model patent application number CN202021097929.8 discloses a gas component detection device for GIS equipment, comprising: a three-way gas chamber with a first air inlet, a first air outlet, and a replenishment air inlet; the first air inlet being sealed to the GIS body to be tested for introducing gas from inside the GIS; a gas absorption tank with a second air inlet at the bottom, which is sealed to the first air inlet via a self-sealing valve; light inlets and light outlets on the left and right sides of the top of the gas absorption tank, respectively; a reflector assembly inside the gas absorption tank for reflecting light incident through the light inlet multiple times to the light outlet; and a spectral analysis system with a light supply component and a light receiving and detection component; the light supply component provides detection light to the light inlet, and the light receiving and detection component receives and processes the light emitted from the light outlet to achieve gas detection. The device is easy to install, and its online monitoring system can perform live detection without affecting the normal operation of the GIS equipment.

[0005] In practical engineering applications, the method of online monitoring via sensor installation has a certain dead zone because the sensors cannot penetrate into the GIS gas chamber for measurement, thus failing to fully reflect the internal conditions of the GIS gas chamber. If a sensor malfunctions during operation, it should be replaced without affecting the operation of the GIS equipment. Currently, no relevant technical reports have been found.

[0006] Therefore, it is necessary to design an installation structure that allows sensors to be inserted into the GIS for measurement without changing the physical characteristics of the GIS equipment, and that allows the sensors to be replaced without affecting the operation of the GIS or without power interruption when the sensors fail. Summary of the Invention

[0007] In view of the deficiencies in the prior art, the purpose of this invention is to provide an installation structure for monitoring sensors in GIS equipment.

[0008] According to one aspect of the present invention, a mounting structure for a monitoring sensor of a GIS device is provided, the mounting structure comprising:

[0009] The main structure is connected to a GIS device at its front end. The main structure has a first channel, a second channel, and a third channel inside. The first channel and the third channel are parallel and at the same height. The second channel is located between the first channel and the third channel and is perpendicular to the first channel.

[0010] The upper cover covers the second channel. The upper cover includes a valve disc and a valve stem disposed above the valve disc. The valve disc is disposed on the side of the upper cover near the main body of the structure. The valve stem passes through the upper cover. The valve disc moves axially along the second channel under the action of the valve stem to separate / connect the first channel and the third channel.

[0011] The rear cover fits onto the rear end of the main structure.

[0012] A limiting buckle is located between the main body of the structure and the back cover, and the two ends of the limiting buckle are fixedly connected to the main body of the structure and the back cover respectively;

[0013] When the first channel is connected to the third channel, the sensor extends into the GIS device through the third channel and the first channel in sequence; the sensor is provided with a first slot and a second slot in sequence from the insertion end of the sensor, and the first slot and the second slot are respectively engaged with the limiting buckle to restrict the position of the sensor inside the GIS device.

[0014] Furthermore, the upper cover also includes a gate valve knob, which is located at the end of the valve stem away from the main structure, and the movement of the valve stem is controlled by the gate valve knob.

[0015] Furthermore, the limiting buckle includes:

[0016] The first and second racks are set relative to each other;

[0017] A snap-fit ​​knob is located between the first rack and the second rack. A gear is provided at the bottom of the snap-fit ​​knob, and the gear meshes with the first rack tooth of the first rack and the second rack tooth of the second rack.

[0018] The first buckle is located on the side of the first rack away from the buckle knob. The first buckle is fixedly connected to the first rack and maintains the same movement trajectory. The surface of the first buckle that interacts with the sensor is provided with first buckle teeth.

[0019] The second latch is located on the side of the second rack away from the latch knob. The second latch is fixedly connected to the second rack and maintains the same movement trajectory. The surface of the second latch that interacts with the sensor is provided with second latch teeth. The second latch teeth cooperate with the first latch teeth to latch the sensor.

[0020] Furthermore, both the first and second locking teeth have a preset angle on their vertical surfaces near the third channel to facilitate the insertion of the sensor.

[0021] Furthermore, a first rack groove is provided on the side of the first rack away from the buckle knob; the first buckle is provided with a first buckle upper tooth, which cooperates with the first rack groove;

[0022] The second rack has a second rack groove on the side away from the buckle knob; the second buckle has a second buckle tooth, which engages with the second rack groove.

[0023] Furthermore, the first buckle is provided with a first support and return spring, and the second buckle is provided with a second support and return spring.

[0024] Furthermore, both the main body of the structure and the rear cover are provided with slots for installing the limiting buckle.

[0025] Furthermore, the sensor is provided with a first sealing groove and a second sealing groove in sequence, and the first sealing groove and the second sealing groove are used to install a sealing ring.

[0026] Furthermore, the outer end face of the first channel is provided with a first sealing ring groove to ensure the airtightness between the installation structure and the GIS equipment; the outer end face of the second channel is provided with a second sealing ring groove to ensure the airtightness between the upper cover and the main body of the structure.

[0027] Furthermore, the main body of the structure is provided with a pressure relief channel inside, which is located at the lower part of the main body of the structure and is connected to the third channel.

[0028] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0029] In the installation process of GIS equipment monitoring sensors, the installation structure as a whole serves as the physical extension of the GIS equipment. Without affecting the physical characteristics of the GIS equipment, the sensor can be inserted into the GIS equipment for measurement without affecting its operation, through the cooperation between the three channels inside the main structure and the valve disc, as well as the limit buckle and the sensor slot. Furthermore, in the event of a sensor failure, the sensor can be replaced without affecting the operation of the GIS equipment or without power interruption. This invention is suitable for the installation and removal of sensors for online monitoring of GIS equipment. Attached Figure Description

[0030] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0031] Figure 1This is a schematic diagram of the installation structure of a GIS equipment monitoring sensor according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the main structure of an embodiment of the present invention, wherein (a) is a schematic diagram of the main structure. Figure 1 (b) is a structural schematic of the main body of the structure. Figure 2 ;

[0033] Figure 3 This is a schematic diagram of the structure of a limiting buckle according to an embodiment of the present invention;

[0034] Figure 4 for Figure 3 The corresponding main view;

[0035] Figure 5 for Figure 3 The corresponding bottom view;

[0036] Figure 6 This is a front view schematic diagram of the installation structure in operation according to one embodiment of the present invention;

[0037] Figure 7 This is a top view schematic diagram of the installation structure in operation according to an embodiment of the present invention;

[0038] Figure 8 This is a front view schematic diagram of the installation structure in the exit state according to an embodiment of the present invention;

[0039] Figure 9 This is a top view of the installation structure in the withdrawn state according to an embodiment of the present invention.

[0040] The corresponding reference numerals in the attached drawings are as follows: 1-Main structure, 11-First channel, 12-Second channel, 13-Third channel, 14-Pressure relief channel, 2-Top cover, 21-Gate valve knob, 22-Valve stem, 23-Valve disc, 3-Limit buckle, 31-Buckling knob, 32-First rack, 33-Second rack, 34-First support return spring, 35-Second support return spring, 36-First buckle, 37-Second buckle, 321-First rack slot, 322-First rack tooth, 331-Second rack slot, 332-Second rack tooth, 361-First buckle upper tooth, 362-First buckle tooth, 371-Second buckle upper tooth, 372-Second buckle tooth, 4-Rear cover, 5-Sensor, 51-First sealing groove, 52-Second sealing groove, 53-First slot, 54-Second slot. Detailed Implementation

[0041] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0042] Without affecting the operation and physical characteristics of GIS equipment, how to link monitoring sensors with GIS equipment is a major challenge restricting the application of online monitoring technology for GIS equipment. To solve this problem, this invention provides an installation structure for a GIS equipment monitoring sensor, referring to... Figure 1-5 The installation structure includes a main body 1, an upper cover 2, a rear cover 4, a limiting buckle 3, and a sensor 5. The front end of the main body 1 is connected to the GIS equipment. The interior of the main body 1 has a first channel 11, a second channel 12, and a third channel 13, which are interconnected within the main body 1. The first channel 11 and the third channel 13 are parallel and at the same height. The second channel 12 is located between the first channel 11 and the third channel 13 and is perpendicular to the first channel 11. The upper cover 2 covers the second channel 12. The upper cover 2 includes a valve disc 23 and a valve stem 22 located above the valve disc 23. The valve disc 23 is located on the side of the upper cover 2 closest to the main body 1. The valve stem 22 passes through the upper cover 2. The second channel 12 corresponds to the position of the valve disc 23, which is located in the center of the second channel 12 and has a width and thickness slightly smaller than the second channel 12. The size and height of the valve disc 23 are half the height of the second channel 12. The valve disc 23 moves axially along the second channel 12 under the drive of the valve stem 22 to separate / connect the first channel 11 and the third channel 13. The rear cover 4 is closed on the rear end of the main body 1 to form a sealed space for the installation structure. The limiting buckle 3 is located between the main body 1 and the rear cover 4. The two ends of the limiting buckle 3 are fixedly connected to the main body 1 and the rear cover 4 respectively. When the first channel 11 and the third channel 13 are connected, the first channel 11 and the third channel 13 form a channel for the sensor 5 to extend into the GIS. The sensor 5 passes through the third channel 13 and the first channel 11 in sequence and extends into the GIS equipment. The sensor 5 is provided with a first slot 53 and a second slot 54 in sequence from the insertion end of the sensor 5. The first slot 53 and the second slot 54 cooperate with the limiting buckle 3 respectively to limit the position of the sensor 5 inside the GIS equipment.

[0043] During the installation of the monitoring sensor in the GIS equipment, the installation structure as a whole serves as the physical extension of the GIS equipment. Without affecting the physical characteristics of the GIS equipment, the sensor 5 is able to extend into the GIS for measurement through the cooperation between the three channels inside the main body 1 and the valve disc 23, as well as the limit buckle 3 and the slot of the sensor 5. Furthermore, if the sensor 5 fails, it can be replaced while the GIS is running without interrupting the power supply.

[0044] In the above embodiment, to prevent gas leakage from the air chamber during the sensor 5 removal process, the mounting structure is provided with at least two slots. The function of the first slot 53 is to prevent the sensor 5 from being directly squeezed out of the mounting structure due to excessive pressure in the air chamber inside the GIS equipment during the removal process, thus preventing gas leakage from the air chamber. The second slot 54 is used to ensure the sensor 5 is fixed after installation. It should be noted that if three or more slots are provided, there is no significant effect on the above-mentioned performance improvement, and it will increase the difficulty of parts processing and the complexity of the operation process. The slot setting in this embodiment ensures that the mounting structure has good sealing performance, and also has the advantages of simple structure, easy processing, and convenient operation.

[0045] In some embodiments, the upper cover 2 also includes a gate valve knob 21, which is located at the end of the valve stem 22 away from the main body 1. The gate valve knob 21 and the valve stem 22 are connected by a threaded connection. Preferably, the valve disc 23 and the valve stem 22 are an integral structure. By rotating the gate valve knob 21, the valve stem 22 is controlled to move up and down, thereby driving the valve disc 23 to move axially along the second channel 12.

[0046] In some embodiments, the limiting buckle 3 includes: a first rack 32 and a second rack 33 disposed opposite to each other, a buckle knob 31, a first buckle 36, and a second buckle 37; wherein, the buckle knob 31 is located between the first rack 32 and the second rack, and a gear is provided at the bottom of the buckle knob 31, the gear meshing with the first rack teeth 322 of the first rack 32 and the second rack teeth 332 of the second rack 33; see reference. Figure 3 and Figure 5When the latch knob 31 rotates clockwise, the first rack 32 and the second rack 33 move apart. Depending on the degree of separation, the matching between the limiting latch 3 and the slot on the sensor 5 varies. By rotating the latch knob 31 to different positions, the degree of separation of the first rack 32 and the second rack 33 is limited, thereby limiting the position of the sensor 5 and ensuring the completion of the insertion and withdrawal process of the sensor 5. The first latch 36 is located on the side of the first rack 32 away from the latch knob 31. The first latch 36 is fixedly connected to the first rack 32 and maintains the same movement trajectory. The surface of the first latch 36 that interacts with the sensor 5 is provided with first latch teeth 362. The second latch 37 is located on the side of the second rack 33 away from the latch knob 31. The second latch 37 is fixedly connected to the second rack 33 and maintains the same movement trajectory. The surface of the second latch 37 that interacts with the sensor 5 is provided with second latch teeth 372. The second latch teeth 372 cooperate with the first latch teeth 362 to limit the position of the sensor 5.

[0047] In some embodiments, the first latching tooth 362 and the second latching tooth 372 are both provided with a preset angle on the vertical surface (the surface in contact with the sensor 5) near the third channel 13 to facilitate the insertion of the sensor 5; wherein the angle of the angle is set according to the specific structural dimensions of the sensor 5.

[0048] In some embodiments, the first rack 32 has a first rack groove 321 on the side away from the latch knob 31; the first latch 36 has a first latch upper tooth 361, which engages with the first rack groove 321; the second rack 33 has a second rack groove 331 on the side away from the latch knob 31; the second latch 37 has a second latch upper tooth 371, which engages with the second rack groove 331. The first latch 36 has a first support return spring 34, and the second latch 37 has a second support return spring 35. The first support return spring 34 and the second support return spring 35 are located on the outer wall between the limiting latch 3 and the main body 1, and their function is to support the limiting latch 3, ensuring that the entire structure is in a closed state when the latch knob 31 is not under force.

[0049] In some embodiments, both the main body 1 and the rear cover 4 are provided with slots for installing the limiting buckle 3. Specifically, the limiting buckle 3 is provided with a connecting part, such as... Figure 3 The lower ends of the first buckle 36 and the second buckle 37 are provided with semi-circular protrusions that mate with the slots. The main body 1 and the back cover 4 have slots corresponding to the connecting parts for the installation of the limiting buckle 3, thereby fixing the two ends of the limiting buckle 3 to the main body 1 and the back cover 4 respectively.

[0050] In some embodiments, the outer end face of the first channel 11 is provided with a first sealing ring groove to ensure the airtightness between the installation structure and the GIS equipment; the outer end face of the second channel 12 is provided with a second sealing ring groove to ensure the airtightness between the upper cover 2 and the main body 1.

[0051] In some embodiments, the sensor 5 is provided with a first sealing groove 51 and a second sealing groove 52 in sequence, which are used to install sealing rings. The main body 1 also has a pressure relief channel 14 located at the lower part of the main body 1. The pressure relief channel 14 is connected to the third channel 13. Since the first channel 11, the second channel 12, and the third channel 13 are interconnected, they are all interconnected inside the main body 1. Through the cooperation of the pressure relief channel 14 with the first sealing groove 51 and the second sealing groove 52 on the sensor 5, the pressure relief channel 14 becomes a channel for releasing internal pressure during the insertion and replacement of the sensor 5. Specifically, by matching the two layers of seals with the pressure relief channel 14 during the insertion of the sensor 5, the sensor minimizes the introduction of external air during insertion or replacement, thus reducing the purity of the gas inside the GIS equipment. During operation, the two layers of seals effectively ensure the airtightness of the overall installation structure. In addition, the other end face of the four channels extends to the outer surface of the main body 1, and corresponding first interface, second interface, third interface and pressure relief port are formed at different positions on the outer surface of the main body 1.

[0052] The installation structure for the GIS equipment monitoring sensor in this embodiment of the invention is suitable for the installation and removal of online monitoring sensors for GIS equipment. It allows the sensor to extend into the GIS for measurement without affecting the operation of the GIS. Furthermore, in the event of a sensor malfunction, it enables replacement without disrupting GIS operation or requiring a power outage. This installation structure is reliable and durable. Because the valve stem drives the valve disc to separate / connect internal channels, there are no requirements regarding the installation angle or direction, making it suitable for various installation scenarios and widely applicable.

[0053] Figure 6-9 The assembled installation structure is shown, along with schematic diagrams illustrating the positions of sensor 5 in both active and deactivated states. The front end of the installation structure is connected to the GIS equipment where the monitoring sensor is to be installed. The valve disc 23 on the upper cover 2 is in a lowered state, separating the first channel 11 from the third channel 13, ensuring that the normal operation of the GIS equipment is not affected.

[0054] When installing sensor 5, sensor 5 extends into the third channel 13. When the first slot 53 of sensor 5 combines with the limiting buckle 3, the schematic diagram of this state is as follows. Figure 8 , Figure 9As shown. After sensor 5 reaches the first slot 53, rotating the gate valve knob 21 causes the valve stem 22 to rise, followed by the valve disc 23. Upon reaching the designated position, the first channel 11 and the third channel 13 form a channel for sensor 5 to extend into, pushing sensor 5 inward. When the second slot 54 of sensor 5 combines with the limiting latch 3, the state at this point is illustrated in the diagram. Figure 6 , Figure 7 As shown, sensor 5 is now installed and the entire system is in operation.

[0055] When sensor 5 is withdrawn, rotate gate valve knob 21 to the withdrawn position. Limit latch 3 separates from second slot 54, and sensor 5 withdraws backward until limit latch 3 engages with first slot 53. At this time, rotate gate valve knob 21, valve stem 22 descends, and valve disc 23 descends, separating first channel 11 from third channel 13. The schematic diagram of this state is shown below. Figure 8 , Figure 9 As shown, after valve disc 23 descends to the designated position, rotate gate valve knob 21 to the replacement position. Sensor 5 will retract until it is completely separated from the mounting structure, thus completing the sensor 5 removal process. Repeat the sensor 5 installation steps to complete the sensor 5 replacement.

[0056] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention. The above preferred features can be used in any combination without conflict.

Claims

1. An installation structure for a monitoring sensor in a GIS device, characterized in that, The installation structure as a whole serves as the physical extension of the GIS equipment, including: The main structure is connected to a GIS device at its front end. The main structure has a first channel, a second channel, and a third channel inside. The first channel and the third channel are parallel and at the same height. The second channel is located between the first channel and the third channel and is perpendicular to the first channel. The upper cover covers the second channel. The upper cover includes a valve disc and a valve stem disposed above the valve disc. The valve disc is located on the side of the upper cover closer to the main structure. The valve stem passes through the upper cover. The valve disc moves axially along the second channel under the action of the valve stem to separate / connect the first channel and the third channel. The upper cover also includes a gate valve knob, which is located at the end of the valve stem away from the main structure. The movement of the valve stem is controlled by the gate valve knob. The rear cover fits onto the rear end of the main structure. A limiting buckle is located between the main body of the structure and the back cover, and the two ends of the limiting buckle are fixedly connected to the main body of the structure and the back cover respectively; When the first channel is connected to the third channel, the sensor extends into the GIS equipment by passing through the third channel and the first channel in sequence. The sensor is provided with a first slot and a second slot in sequence from the insertion end of the sensor. The first slot and the second slot are respectively engaged with the limiting buckle to limit the position of the sensor inside the GIS equipment. The first slot is used to prevent the sensor from being directly squeezed out of the installation structure during the sensor withdrawal process, and the second slot is used to ensure the sensor is fixed after installation.

2. The installation structure of the GIS equipment monitoring sensor according to claim 1, characterized in that, The limiting buckle includes: The first and second racks are set relative to each other; A snap-fit ​​knob is located between the first rack and the second rack. A gear is provided at the bottom of the snap-fit ​​knob, and the gear meshes with the first rack tooth of the first rack and the second rack tooth of the second rack. The first buckle is located on the side of the first rack away from the buckle knob. The first buckle is fixedly connected to the first rack and maintains the same movement trajectory. The surface of the first buckle that interacts with the sensor is provided with first buckle teeth. The second latch is located on the side of the second rack away from the latch knob. The second latch is fixedly connected to the second rack and maintains the same movement trajectory. The surface of the second latch that interacts with the sensor is provided with second latch teeth. The second latch teeth cooperate with the first latch teeth to latch the sensor.

3. The installation structure of the GIS equipment monitoring sensor according to claim 2, characterized in that, Both the first and second locking teeth have a preset angle of inclination relative to the vertical surface near the third channel to facilitate the insertion of the sensor.

4. The installation structure of the GIS equipment monitoring sensor according to claim 2, characterized in that, The first rack has a first rack groove on the side away from the buckle knob; the first buckle has a first buckle tooth, which engages with the first rack groove. The second rack has a second rack groove on the side away from the buckle knob; the second buckle has a second buckle tooth, which engages with the second rack groove.

5. The installation structure of the GIS equipment monitoring sensor according to claim 2, characterized in that, The first buckle is provided with a first support and return spring, and the second buckle is provided with a second support and return spring.

6. The installation structure of the GIS equipment monitoring sensor according to claim 1, characterized in that, Both the main body of the structure and the rear cover are provided with slots for installing the limiting buckles.

7. The installation structure of the GIS equipment monitoring sensor according to claim 1, characterized in that, The sensor is provided with a first sealing groove and a second sealing groove in sequence, and the first sealing groove and the second sealing groove are used to install a sealing ring.

8. The installation structure of the GIS equipment monitoring sensor according to claim 1, characterized in that, The outer end face of the first channel is provided with a first sealing ring groove to ensure the airtightness between the installation structure and the GIS equipment; the outer end face of the second channel is provided with a second sealing ring groove to ensure the airtightness between the upper cover and the main body of the structure.

9. The installation structure of the GIS equipment monitoring sensor according to claim 1, characterized in that, The main body of the structure is also provided with a pressure relief channel, which is located at the lower part of the main body of the structure and is connected to the third channel.

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