CN109994958B - Sealing method for gas-insulated totally-enclosed combined electrical apparatus - Google Patents
Sealing method for gas-insulated totally-enclosed combined electrical apparatus Download PDFInfo
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- CN109994958B CN109994958B CN201910308847.9A CN201910308847A CN109994958B CN 109994958 B CN109994958 B CN 109994958B CN 201910308847 A CN201910308847 A CN 201910308847A CN 109994958 B CN109994958 B CN 109994958B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/045—Details of casing, e.g. gas tightness
Abstract
The invention relates to a sealing method for a gas-insulated totally-enclosed combined electrical apparatus, through adopting the above-mentioned sealing method for the gas-insulated totally-enclosed combined electrical apparatus, fix the first tie coat and second tie coat on the surface of combined electrical apparatus first, and the gas that leaks through the air leakage hole in the combined electrical apparatus can be discharged through the connecting passage, avoid the high-speed air current to hinder the problem that two tie coats fix on the surface of combined electrical apparatus; then one end of the ventilation piece extends into the second through hole and is fixed through the fixing piece, and the problem that the ventilation piece and the fixing piece cannot be fixed is avoided because leaked gas can still be exhausted through the ventilation piece; the sealing of the air leakage hole of the combined electrical appliance can be realized only by sealing the ventilation part through the sealing part after the ventilation part is fixed, the air can be repaired on line without emptying the air, the maintenance period is shortened, the power system is not required to be powered off, and the loss caused by power failure is avoided.
Description
Technical Field
The invention relates to the technical field of insulating gas leakage repair equipment, in particular to a sealing method for a gas-insulated fully-closed combined electrical apparatus.
Background
With the rapid development of the national electric power industry, the gas insulated fully-closed combined electron is also rapidly developed. The gas-insulated totally-enclosed combined electrical apparatus is widely applied to electrical equipment due to excellent insulating property and arc extinguishing property. When the existing gas insulated fully-closed combined electrical apparatus is applied, gas leakage phenomena such as uneven flange surface, rusting, failure and dislocation of a sealing ring, sand holes on a pipe wall, insufficient welding and the like occur in a gas chamber of the combined electrical apparatus due to various factors. At present, the traditional maintenance mode needs to spend longer time to perform power failure exhaust, and the maintenance period is longer.
Disclosure of Invention
Therefore, the sealing method for the gas-insulated fully-closed combined electrical apparatus is needed to solve the problem that the maintenance cycle of gas leakage of the gas chamber of the traditional gas-insulated fully-closed combined electrical apparatus is long, repair the gas leakage position under the condition that the combined electrical apparatus does not stop exhausting, and shorten the maintenance cycle.
A sealing method for a gas insulated totally enclosed switchgear, comprising the steps of:
forming a first connecting layer fixedly connected with the combined electrical apparatus on the surface of the combined electrical apparatus, wherein the first connecting layer is provided with a first through hole communicated with the air leakage hole of the combined electrical apparatus;
forming a second connecting layer fixedly connected with the first connecting layer on the first connecting layer, wherein the second connecting layer is provided with a second through hole communicated with the first through hole;
providing an air vent, and extending one end of the air vent from the second through hole and abutting against the surface of the combined electrical apparatus so as to enable the air leaked from the air leakage hole of the combined electrical apparatus to be discharged from the air vent;
a fixing piece which is respectively sealed and fixedly connected with the ventilation piece and the inner wall of the second through hole is formed between the ventilation piece and the inner wall of the second through hole;
providing a sealing element and connecting the sealing element to one end of the ventilation element far away from the combined electrical apparatus so as to seal the ventilation element.
By adopting the sealing method for the gas-insulated totally-enclosed combined electrical apparatus, the first connecting layer and the second connecting layer are fixed on the surface of the combined electrical apparatus, and gas leaked through the gas leakage hole in the combined electrical apparatus can be discharged through the connecting channel, so that the problem that high-speed airflow obstructs the two connecting layers to be fixed on the surface of the combined electrical apparatus is avoided; then one end of the ventilation piece extends into the second through hole and is fixed through the fixing piece, and the problem that the ventilation piece and the fixing piece cannot be fixed is avoided because leaked gas can still be exhausted through the ventilation piece; the sealing of the air leakage hole of the combined electrical appliance can be realized only by sealing the ventilation part through the sealing part after the ventilation part is fixed, the air can be repaired on line without emptying the air, the maintenance period is shortened, the power system is not required to be powered off, and the loss caused by power failure is avoided.
In one embodiment, the vent has an air flow passage and an air inlet and an air outlet communicating with the air flow passage;
one end of the ventilation piece, provided with the air inlet, extends into the second through hole and abuts against the surface of the combined electrical appliance; the sealing piece is connected to the air outlet of the air vent and used for sealing the air outlet.
In one embodiment, the vent piece includes a main body portion and an abutting portion, the abutting portion is fixedly connected to one end of the main body portion, the radial size of the abutting portion is larger than that of the main body portion, and the abutting portion extends into the second through hole and abuts against the surface of the combined electrical apparatus.
In one embodiment, the thickness of the second connection layer is greater than the thickness of the first connection layer.
In one embodiment, the first connection layer and the second connection layer are both repair mastic layers.
In one embodiment, the vent is a metal tube and the seal is a metal cap that mates with the vent.
In one embodiment, the sealing method further comprises the steps of:
and forming a sealing layer fixedly connected with the second connecting layer on the second connecting layer, wherein the sealing layer covers the ventilation piece and the sealing piece and is fixedly connected with the ventilation piece and the sealing piece.
In one embodiment, the method further comprises the following steps before forming the sealing layer on the second connection layer:
and forming a fastening layer fixedly connected with the second connecting layer on the second connecting layer, wherein the fastening layer is positioned between the second connecting layer and the sealing layer, and the fastening layer covers the fixing piece and is fixedly connected with the fixing piece and the ventilation piece.
In one embodiment, the method further comprises the following steps before the first connecting layer is formed on the surface of the combined electrical apparatus:
and polishing and cleaning the surface around the air leakage hole of the combined electrical apparatus.
In one embodiment, the step of polishing and cleaning the surface around the leakage hole of the combined electrical apparatus specifically comprises the following steps:
polishing the periphery of the air leakage hole to form a polishing area;
wiping off particles generated by polishing;
the sanded area is cleaned until no visible dirt is present.
Drawings
Fig. 1 is a sectional view of a sealing device for a gas insulated switchgear according to an embodiment of the present invention;
FIG. 2 is a schematic view of the vent of the sealing device shown in FIG. 1;
fig. 3 is a flowchart of a sealing method for a gas insulated switchgear according to another embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
In order to facilitate understanding of the technical solution of the present invention, a conventional method for repairing a gas chamber leak of a gas insulated fully-closed combined electrical apparatus will be described herein: because the gas chamber of the combined electron is usually filled with sulfur hexafluoride gas and the gas pressure is higher, the gas flow rate at the gas leakage position is faster, and the repairing material cannot be directly smeared on the gas leakage hole. When the existing repairing mode is used for repairing, the power system needs to be powered off in advance, then the gas in the gas chamber needs to be exhausted, the time is long, and the loss is large when the power system is powered off for a long time.
As shown in fig. 1 and 2, a sealing device 10 for a gas insulated switchgear assembly according to an embodiment of the present invention includes a connecting assembly 12, a vent member 14, a fixing member 16, and a sealing member 18.
The connecting component 12 is fixedly connected to the combined electrical apparatus 20, and the connecting component 12 has a connecting channel communicated with the air leakage hole of the combined electrical apparatus 20. The air-permeable member 14 has an air flow channel 142 and an air inlet and an air outlet 144 communicated with the air flow channel 142, and one end of the air-permeable member 14 having the air inlet extends into the connecting channel for communicating the air inlet with the air leakage hole.
The fixing member 16 is fixedly connected between the vent 14 and the inner wall of the connecting passage, and the fixing member 16 is used for fixing the vent 14 and sealing the gap between the vent 14 and the inner wall of the connecting passage. The sealing member 18 is detachably attached to the vent port 144 of the vent member 14 for closing the vent port 144.
By arranging the sealing device for the gas insulated totally-enclosed combined electrical apparatus 20, the connecting assembly 12 is fixedly connected to the gas leakage position of the combined electrical apparatus 20, the connecting channel is ensured to be communicated with the gas leakage hole, then the ventilation piece 14 is fixed to the connecting channel through the fixing piece 16, the gap between the ventilation piece 14 and the inner wall of the connecting channel is sealed, the gas inlet of the ventilation piece 14 is communicated with the gas leakage hole, and finally the sealing piece 18 is connected to the gas outlet 144 of the ventilation piece 14.
Therefore, the connecting component 12 is fixed on the surface of the combined electrical apparatus 20, and the gas leaked from the leakage hole in the combined electrical apparatus 20 can be discharged through the connecting channel, so that the problem that the high-speed airflow obstructs the connecting component 12 to be connected to the surface of the combined electrical apparatus 20 is avoided; then the ventilation piece 14 is fixed at the connecting channel through the fixing piece 16, and the leaked gas can still be discharged through the ventilation piece 14, so that the problem that the ventilation piece 14 and the fixing piece 16 cannot be fixed at the connecting channel is avoided; after the air vent 14 is fixed, the air vent 144 of the air vent 14 is sealed by the sealing element 18, so that the air vent of the combined electrical apparatus 20 can be sealed, the air is not required to be evacuated, the air vent of the combined electrical apparatus 20 can be repaired on line, the maintenance period is shortened, the power system is not required to be powered off, and the loss caused by power failure is avoided.
In some embodiments, the sealing device further comprises a repair layer fixedly attached around the leakage orifice of the combined electrical apparatus 20. In the case of the combined electrical apparatus 20, there are some cracks around the leakage hole, and the repair layer is used to fill the cracks. Before the leakage hole is repaired, gas is mainly discharged from the leakage hole, so that the crack can be directly filled and repaired by using the repairing layer. Specifically, the repairing layer is 10110 plastic steel repairing agent. Of course, in other embodiments, the repair layer may not be used, and the connection assembly 12 may directly cover the periphery of the leakage hole, or the crack may be repaired.
In some embodiments, the connecting assembly 12 includes a first connecting layer 122 and a second connecting layer 124, the first connecting layer 122 and the second connecting layer 124 are stacked along a first direction, the first connecting layer 122 is fixedly connected to the combined electrical apparatus 20, and the second connecting layer 124 is fixedly connected to a side of the first connecting layer 122 away from the combined electrical apparatus 20. That is, the first direction is a direction perpendicular to a contact surface of the first connection layer 122 and the second connection layer 124, and the second connection layer 124 covers the first connection layer 122.
Further, the first connection layer 122 has a first through hole penetrating the first connection layer 122 along the first direction, the first through hole is communicated with the air leakage hole of the combined electrical apparatus 20, the second connection layer 124 has a second through hole penetrating the second connection layer 124 along the first direction, the second through hole is communicated with the first through hole to form the above-mentioned connection channel, and the air inlet is communicated with the second through hole.
It can be understood that the first connection layer 122 and the second connection layer 124 both have a certain thickness in the first direction, and the first through hole and the second through hole respectively penetrate through the first connection layer 122 and the second connection layer 124 along the first direction, so that the first through hole and the second through hole also have a certain length along the first direction; the first connecting layer 122 and the second connecting layer 124 are stacked, and the first through hole and the second through hole are communicated, so that the connecting channel can be formed.
Specifically, the first connecting layer 122 and the second connecting layer 124 are both repairing mastic layers, and are both 10240 plastic steel quick-drying repairing mastic. First, a layer of repair mortar is laid near the air leakage hole of the combined electrical apparatus 20, as described above, in the case of laying the repair layer, the repair layer is only used for filling the crack around the air leakage hole, so the first layer of repair mortar is fixedly connected to the repair layer and the surface of the combined electrical apparatus 20, and in the case of not laying the repair layer, the crack can be filled and repaired by directly laying the repair mortar. After the first layer of repairing mortar is solidified, a layer of repairing mortar is continuously paved on the first layer of repairing mortar, and a first connecting layer 122 and a second connecting layer 124 which are arranged in a stacked mode are formed after the first layer of repairing mortar is solidified.
Combining the above-mentioned forming manners of the first connection layer 122 and the second connection layer 124, it can be obtained that the first through hole and the second through hole are both similar to the shape and size of the air leakage hole of the combined electrical apparatus 20. Certainly, the repair daub is manually smeared around the air leakage hole, and the repair daub can only be smeared at the position close to the air leakage hole as much as possible, so that the first through hole and the second through hole formed by the repair daub are matched with the air leakage hole, but the shapes and the sizes of the first through hole and the second through hole can be the same.
In some embodiments, the thickness of the second connection layer 124 in the first direction is thicker than the thickness of the first connection layer 122 in the first direction. The first connection layer 122 can be understood as a base layer fixedly connected to the combined electrical apparatus 20, mainly for ensuring the stability of the connection, or filling the crack, so that it is not necessary to be too thick; the second connection layer 124 may cover the first connection layer 122 to enhance the sealing effect against cracks, and may be used to connect to the fixing member 16, and the first connection layer 122 has a small thickness and is not suitable for connecting to the fixing member 16.
Furthermore, if the first connecting layer 122 and the second connecting layer 124 are simultaneously arranged, i.e. only one layer of repair mastic is laid, and the thickness of this layer is the sum of the thicknesses of the first connecting layer 122 and the second connecting layer 124, the function of this layer includes connecting the combiner 20, sealing the crack and connecting the fixing 16. The repair mortar of this layer has a slower setting speed than that of the first connection layer 122, and there may be problems that the connection with the composite apparatus 20 before the setting is unstable or the sealing effect of the crack is not good. The repair mastic is thus applied in two layers, and the first connecting layer 122 is thinner than the second connecting layer 124, mainly to ensure the stability of the connection and the sealing of the crack.
In some embodiments, the fixing member 16 is a quick steel, i.e., a steel reinforced repairing agent, which can be quickly solidified, so that after the air inlet end of the air vent 14 is inserted into the connection channel, the quick steel can be connected between the air vent 14 and the connection assembly 12 to quickly achieve the fixed connection between the air vent 14 and the connection assembly 12.
Specifically, the instant steel is connected between the air inlet end of the breather 14 and the second connecting layer 124. It will be appreciated that the breather 14 is operable to vent gases, and therefore when the instant steel is connected between the second connection layer 124 and the breather 14, the gas flow is primarily vented from the breather 14, thereby avoiding the gas flow from affecting the connection of the instant steel.
Of course, in other embodiments, the quick steel is poured into the gap between the vent 14 and the inner wall of the connecting channel, so that the quick steel is fixedly connected to both the first connecting layer 122 and the second connecting layer 124. It is preferable to fixedly connect with the first connection layer 122 and the second connection layer 124 at the same time to ensure the sealing property and the connection stability.
It should be noted that the rapid steel in the two embodiments is connected to the first connecting layer 122 and the second connecting layer 124, mainly because the solidification speed of the rapid steel is fast, when the rapid steel is slowly poured into the gap between the vent 14 and the inner wall of the connecting channel, because the thickness of the second connecting layer 124 is thick, there may be a case that the rapid steel is solidified to flow to contact with the first connecting layer 122, and the rapid steel is only fixedly connected with the second connecting layer 124; when rapid steel pouring is performed, the gap between the vent member 14 and the inner wall of the connecting passage is filled up, and after the rapid steel is solidified, the rapid steel is fixedly connected to the first connecting layer 122 and the second connecting layer.
In some embodiments, the flow area of the inlet of the vent 14 is similar to the flow area of the leakage orifice to ensure that a majority of the gas exiting the leakage orifice is vented from the vent 14 when the vent 14 is positioned. Further, the vent 14 is tubular. Specifically, the air vent 14 is a metal pipe, which may be a steel pipe, an iron pipe, or other metal pipes, and of course, the material may be selected according to actual requirements.
In some embodiments, the air vent 14 includes a main body portion 146 and an abutting portion 148 fixedly connected to each other, the main body portion 146 has the air flow channel 142 and the air inlet and the air outlet 144, the abutting portion 148 is disposed on a side surface of the main body portion 146 adjacent to the air inlet and is close to the air inlet, and the abutting portion 148 is fixedly connected to the fixing member 16 for ensuring stability of connection between the air vent 14 and the fixing member 16.
In practical applications, the main body portion 146 is tubular, and the abutting portion 148 is an abutting ring fixedly connected to a circumferential side surface of the tubular main body portion 146 and close to the air inlet end. In this way, if the side wall of the tubular body portion 146 is connected to the quick steel alone, the connection strength is ensured by the adhesion between the quick steel and the tube. If the abutment ring is provided, the strength of the connection between the breather piece 14 and the quick steel can be ensured by the bonding strength between the quick steel and the pipe and the abutment force between the quick steel and the abutment ring.
Specifically, the side surface of the abutting ring and the end surface of the air inlet end are in the same plane. So, can stretch into the interface channel with the air inlet end of air-permeable piece 14 to the butt is on combined electrical apparatus 20, it is enough to guarantee that the air inlet corresponds with the gas leakage hole, then pours into the fast steel into the clearance between main part 146 and the interface channel again, with the gap between sealed air-permeable piece 14 and coupling assembling 12 and fixed air-permeable piece 14 and the coupling assembling 12 between be connected.
It should be noted that the flow areas of the air inlet and the air leakage hole of the main body portion 146 are similar (the area of the air inlet is equal to or slightly larger than the flow area of the air leakage hole), and the flow areas of the air flow channel 142 and the air outlet 144 are equal to the flow area of the air inlet because the main body portion 146 is tubular. In order to ensure that the first connection layer 122 and the second connection layer 124 can be stably connected to the surface of the combined electrical apparatus 20, the flow area of the connection channel is larger than that of the leakage hole, and the radial dimension of the abutting portion 148 is larger than that of the main body portion 146. It follows that the radial dimension of the connecting channel is greater than or equal to the radial dimension of the abutment 148, so that the abutment 148 can project into the connecting channel; the radial dimension of the abutment 148 is greater than the radial dimension of the body portion 146 and is also greater than the radial dimension of the airflow passage 142.
In some embodiments, the sealing device further includes a fastening layer fixedly connected to a side of the connecting component 12 away from the combined electrical apparatus 20, and fixedly connected to the fixing component 16 and the ventilation component 14, for further improving the stability and sealing performance of the connection between the ventilation component 14 and the connecting component 12. Specifically, the fastening layer is a repair mortar layer, and is 10240 plastic steel quick-drying repair mortar.
In some embodiments, the inner wall of the air flow channel 142 is internally threaded at an end adjacent to the air outlet 144, and the sealing member 18 is externally threaded to mate with the internal threads so that the sealing member 18 is threadably engaged with the vent member 14 to close the air outlet 144. Further, the sealing member 18 is a metal cap with a screw thread, and the material of the metal cap is the same as that of the vent 14. Specifically, after the metal cover is screwed to the air outlet 144 end of the air vent 14, a layer of quick steel may be coated on the joint to ensure that the metal cover is hermetically connected with the air vent 14.
In some embodiments, the sealing device further includes a sealing layer 19, and the sealing layer 19 covers the connecting component 12, the vent 14, and the sealing member 18, and is fixedly connected to the connecting component 12, the vent 14, and the sealing member 18 for further ensuring the sealing performance. Specifically, the sealing layer 19 is a repairing daub layer, and the repairing daub is 10240 plastic-steel quick-drying repairing daub. It can be understood that 10240 plastic steel quick-drying repair mortar is adopted for the fixing member 16, the ventilation member 14 and the sealing member 18 to cover the surface thereof, mainly because the connection among the same materials of the connecting member 12, the fastening layer and the sealing layer 19 is more stable than the connection among the different materials, so that a layer of 10240 plastic steel quick-drying repair mortar covers the fixing member 16, the ventilation member 14 and the sealing member 18, mainly to ensure the stability of the connection among the structures, and further improve the sealing effect.
It will be appreciated that the sealing layer 19 is of the same material as the fastening layer and that if provided the sealing layer 19 covers the fastening layer, the effect is repeated, so that in some embodiments the fastening layer may also be laid down in addition, with the stability of the connection and the tightness of the structure being achieved directly by the sealing layer 19.
In some embodiments, the first connecting layer 122 is coated on the combined electrical apparatus 20, for example, a generally pipe-shaped air leakage structure of the combined electrical apparatus 20, and the first connecting layer 122 surrounds the pipe structure and covers the air leakage portion to ensure the strength of the connection between the first connecting layer 122 and the combined electrical apparatus 20. Similarly, the second connection layer 124 is wrapped on the first connection layer 122; the fastening layer is wrapped around the second connecting layer 124 and covers the fixing element 16, and is also fixedly connected to the side of the ventilation element 14. The sealing layer 19 theoretically seals the leakage hole in each of the constituent layers below the sealing layer 19, and the sealing layer 19 is only required to cover the ventilation member 14 and the sealing member 18 and be fixedly connected to the fastening layer in order to ensure the connection strength and improve the sealing performance.
In other embodiments, all the structural layers may cover only all the air leakage parts, such as the air leakage holes and the cracks around the air leakage holes, while ensuring the connection strength. Therefore, the sealing material can be saved, and the cost is reduced. Of course, in order to ensure the sealing ability and the reliability of the combined electrical apparatus 20, it is preferable to cover the combined electrical apparatus 20.
Referring to fig. 3, another embodiment of the present invention provides a sealing method for a gas insulated, hermetically sealed combined electrical apparatus 20, including the following steps:
s110, a first connection layer 122 fixedly connected to the combined electrical apparatus 20 is formed on the surface of the combined electrical apparatus 20, and the first connection layer 122 has a first through hole communicated with the air leakage hole of the combined electrical apparatus 20.
S120, a second connection layer 124 fixedly connected to the first connection layer 122 is formed on the first connection layer 122, and the second connection layer 124 has a second through hole communicated with the first through hole.
As such, the first connection layer 122 and the second connection layer 124 form the connection assembly 12, and the first through hole and the second through hole form a connection channel.
Specifically, a layer of repair mastic is laid on the surface of the combined electrical apparatus 20, the layer of repair mastic does not seal the air leakage hole, after the layer of repair mastic is solidified, a layer of repair mastic is further laid on the surface of the layer of repair mastic, and the thickness of the repair mastic laid later is greater than that of the repair mastic laid earlier. Meanwhile, the paving area of the repair mastic may be the above-mentioned polishing area, the rough arrangement of the polishing area ensures the connection strength with the repair mastic, and of course, the paving area may also be coated on the combined electrical apparatus 20 as described in the above-mentioned embodiment.
S130, providing the vent 14, and extending one end of the vent 14 from the second through hole to abut against the surface of the combined electrical apparatus 20, so that the gas leaking from the leakage hole of the combined electrical apparatus 20 can be discharged from the vent 14.
In some embodiments, the vent 14 has an airflow channel 142 and an air inlet and an air outlet 144 communicating with the airflow channel 142, and one end of the vent 14 provided with the air inlet extends from the second through hole and abuts against the surface of the combined electrical apparatus 20.
In other embodiments, the vent 14 includes a main body portion 146 and an abutting portion 148, the abutting portion 148 is fixedly connected to one end of the main body portion 146, a radial dimension of the abutting portion 148 is larger than a radial dimension of the main body portion, and the abutting portion extends into the second through hole and abuts against a surface of the combined electrical apparatus 20. Further, the main body portion 146 has an air flow passage 142, and an air inlet and an air outlet 144 communicating with the air flow passage 142, and the abutting portion 148 is fixedly connected to one end of the main body portion 146 where the air inlet is provided. The contact portion 148 is brought into contact with the surface of the combined electrical apparatus 20, and the air inlet of the main body portion 146 corresponds to the air leakage hole, so that the gas leaking from the air leakage hole is discharged through the main body portion 146. Specifically, the abutting portion 148 is an abutting ring, and the function of the abutting ring is described in the above embodiments and is not described again.
And S140, forming a fixing piece 18 which is respectively sealed and fixedly connected with the ventilating piece 14 and the inner wall of the second through hole between the ventilating piece 14 and the inner wall of the second through hole, so that the gas leaked from the leakage hole is discharged from the gas outlet 144 of the ventilating piece 14.
Further, the fixing member 14 is not limited to be fixedly connected to only the inner wall of the second through hole, and may be fixedly connected to both the inner walls of the first through hole and the second through hole. Specifically, the gap between the vent 14 and the inner wall of the connecting channel is filled with rapid steel, the rapid steel can be rapidly solidified so as to fix the air inlet end of the vent 14 in the connecting channel, and the rapid steel can also seal the gap between the vent 14 and the inner wall of the connecting channel, so that the air leaking from the air leakage hole is exhausted from the air outlet 144 of the vent 14.
And S150, providing the sealing element 18, and connecting the sealing element 18 to one end of the ventilation element 14 far away from the combined electrical apparatus 20 to seal the ventilation element 14.
Further, the sealing member 18 is connected to the air outlet 144 of the air vent 14, and after the sealing member 18 is connected to the air vent 14, a layer of quick steel is coated on the connection position of the sealing member 18 and the air vent 14 to ensure the sealing performance. Specifically, the vent 14 is a metal tube, and the sealing element 18 is a metal cover, which is screwed to the metal tube at the gas outlet 144 to close the gas outlet 144.
According to the structure of the above embodiment, only the ventilation member 14 and the sealing member 18 are formed in advance in the sealing device, and other parts, such as the connecting member 12, the fixing member 16, the fastening layer and the sealing layer 19, are formed in the subsequent sealing process, so that only the ventilation member 14 and the sealing member 18 are required to be provided at the beginning, and the ventilation member 14 and the sealing member 18 are the same as those in the above embodiment.
And S160, forming a sealing layer 19 fixedly connected with the second connecting layer 124 on the second connecting layer 124, wherein the sealing layer 19 covers the ventilation piece 14 and the sealing piece 18 and is fixedly connected with the sealing piece 18 and the ventilation piece 14.
In particular, the sealing layer 19 is also a repair mastic layer to ensure sealability.
By adopting the sealing method for the gas insulated totally enclosed switchgear 20, the first connecting layer 122 and the second connecting layer 124 are fixed on the surface of the switchgear 20, and the gas leaked from the leakage holes in the switchgear 20 can be discharged through the connecting channel, so that the problem that the high-speed airflow blocks the two connecting layers from being fixed on the surface of the switchgear 20 is avoided; then, one end of the ventilation piece 14 extends into the second through hole and is fixed through the fixing piece 16, and the leaked gas can still be discharged through the ventilation piece 14, so that the problem that the ventilation piece 14 and the fixing piece 16 cannot be fixed is solved; after the air vent 14 is fixed, the air vent 14 is sealed only through the sealing element 18, so that the air vent of the combined electrical appliance 20 can be sealed, the air is not required to be exhausted, the air vent of the combined electrical appliance 20 can be repaired on line, the maintenance period is shortened, the power system is not required to be powered off, and the loss caused by power failure is avoided.
In some embodiments, the surface of the combined electrical apparatus 20 around the leakage hole may be polished and cleaned before the first connection layer 122 is formed on the surface of the combined electrical apparatus 20. Further, the periphery of the leakage hole is firstly polished to remove the paint around the leakage hole, and the surface of the combined electrical appliance 20 is roughened to form a polished area; the polished area is then cleaned until the polished area is free of visible contamination. Specifically, the polishing area is an area which takes the air leakage hole as the center and has the length and the width of 12 centimeters, and can be polished by an electric angle grinder, a steel wire ball, abrasive paper or a steel saw and the like; the cleaning can be carried out by firstly wiping the particles generated by polishing with cloth, and then dipping 1755 high-efficiency cleaning agent or absolute alcohol with absorbent cotton for at least three times.
In some embodiments, after the sealing member 18 is connected to the air outlet 144 of the ventilation member 14, i.e., before the sealing layer 19 is formed on the second connection layer 124, a fastening layer fixedly connected to the second connection layer 124 may be formed on the second connection layer 124, and after the sealing layer 19 is formed, the fastening layer is located between the second connection layer 124 and the sealing layer 19, covers the fixing member 16, and is fixedly connected to the ventilation member 14 and the fixing member 16.
Specifically, after the rapid steel in the gap between the vent 14 and the connecting channel is solidified, a layer of repair mortar is continuously laid on the surface of the second connecting layer 124, and the layer of repair mortar covers the solidified rapid steel to ensure the stability and the sealing performance of the connection.
Compared with the prior art, the sealing device for the gas insulated fully-closed combined electrical apparatus provided by the invention at least has the following advantages:
1) the online repair can be carried out, power failure and exhaust are not needed, the maintenance period is shortened, and the loss caused by power failure is avoided;
2) the sealing effect is good.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A sealing method for a gas insulated totally-enclosed combined electrical apparatus is characterized by comprising the following steps:
forming a first connecting layer fixedly connected with the combined electrical apparatus on the surface of the combined electrical apparatus, wherein the first connecting layer is provided with a first through hole communicated with the air leakage hole of the combined electrical apparatus;
forming a second connecting layer fixedly connected with the first connecting layer on the first connecting layer, wherein the second connecting layer is provided with a second through hole communicated with the first through hole;
providing an air vent, and extending one end of the air vent from the second through hole and abutting against the surface of the combined electrical apparatus so as to enable the air leaked from the air leakage hole of the combined electrical apparatus to be discharged from the air vent;
a fixing piece which is respectively sealed and fixedly connected with the ventilation piece and the inner wall of the second through hole is formed between the ventilation piece and the inner wall of the second through hole;
providing a sealing member and connecting the sealing member to one end of the ventilation member far away from the combined electrical apparatus so as to seal the ventilation member;
forming a sealing layer fixedly connected with the second connecting layer on the second connecting layer, wherein the sealing layer covers the ventilation piece and the sealing piece and is fixedly connected with the ventilation piece and the sealing piece;
the first connecting layer, the second connecting layer and the sealing layer are all repair daub layers.
2. The sealing method for a gas insulated fully enclosed switchgear as claimed in claim 1, wherein said vent member has a gas flow passage and gas inlet and gas outlet communicating with said gas flow passage;
one end of the ventilation piece, provided with the air inlet, extends into the second through hole and abuts against the surface of the combined electrical appliance; the sealing piece is connected to the air outlet of the air vent and used for sealing the air outlet.
3. The sealing method for the gas insulated totally enclosed switchgear as claimed in claim 2, wherein the end of the inner wall of the gas flow channel near the gas outlet is provided with an internal thread, and the sealing member is provided with an external thread matching the internal thread, so that the sealing member is screwed to the vent member.
4. The sealing method for the gas insulated fully enclosed switchgear according to claim 1, wherein the vent member includes a main body portion and an abutting portion, the abutting portion is fixedly connected to one end of the main body portion, a radial dimension of the abutting portion is larger than a radial dimension of the main body portion, and the abutting portion extends from the second through hole and abuts against a surface of the switchgear.
5. The sealing method for a gas insulated switchgear according to claim 4, wherein the main body is tubular, and the abutting portion is an abutting ring fixedly attached to a circumferential side surface of the main body having a tubular shape.
6. The sealing method for a gas insulated all closed switchgear according to claim 1, wherein the thickness of the second connection layer is larger than the thickness of the first connection layer.
7. The sealing method for a gas insulated switchgear according to claim 1, wherein the vent is a metal pipe and the sealing member is a metal cap fitted to the vent.
8. The sealing method for a gas insulated all closed switchgear according to claim 1, further comprising the steps of, before forming the sealing layer on the second connection layer:
and forming a fastening layer fixedly connected with the second connecting layer on the second connecting layer, wherein the fastening layer is positioned between the second connecting layer and the sealing layer, and the fastening layer covers the fixing piece and is fixedly connected with the fixing piece and the ventilation piece.
9. A sealing method for a gas insulated fully enclosed switchgear according to any of claims 1 to 6, further comprising the steps of, before forming said first connection layer on said switchgear surface:
and polishing and cleaning the surface around the air leakage hole of the combined electrical apparatus.
10. The sealing method for the gas insulated fully enclosed switchgear according to claim 9, wherein the polishing and cleaning of the surface around the leakage hole of the switchgear specifically comprises the steps of:
polishing the periphery of the air leakage hole to form a polishing area;
wiping off particles generated by polishing;
the sanded area is cleaned until no visible dirt is present.
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| CN201910308847.9A CN109994958B (en) | 2019-04-17 | 2019-04-17 | Sealing method for gas-insulated totally-enclosed combined electrical apparatus |
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| JPS5598807A (en) * | 1979-01-22 | 1980-07-28 | Hitachi Ltd | Insulated conductor device |
| CN2324370Y (en) * | 1997-12-26 | 1999-06-16 | 中国石化茂名石油化工公司 | Leaking stoppage device for pipeline with pressure |
| CN103115217A (en) * | 2013-02-26 | 2013-05-22 | 枣庄矿业（集团）有限责任公司柴里煤矿 | Pressure plugging unit |
| CN204725090U (en) * | 2015-07-09 | 2015-10-28 | 安徽淮化股份有限公司 | Storage tank leakage compensating device |
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