A power little oil equipment oil discharging and supplementing device and method

Abstract

The present application relates to the technical field of power maintenance, and in particular to a power oil-lean equipment oil discharging and supplementing device and method. The oil discharging and supplementing device comprises: a first oil inlet valve; a bidirectional oil pump, one end of which is connected to a discharge end of the first oil inlet valve; an oil-gas separator, an oil inlet end of which is connected to the other end of the bidirectional oil pump, an exhaust end of which is adapted with a first exhaust valve, and the oil-gas separator is adapted with a first liquid level meter and a second liquid level meter, the first liquid level meter is used for monitoring the liquid level of the oil-gas separator body, and the second liquid level meter is used for monitoring the liquid level of the exhaust end of the oil-gas separator; a first oil supplementing valve, one end of which is connected to an oil outlet end of the oil-gas separator, and the other end of which can be connected to the oil-lean equipment; a second oil supplementing valve, which is connected in series between the bidirectional oil pump and the oil-gas separator; a second exhaust valve, an air inlet end of which is connected between the bidirectional oil pump and the oil-gas separator; and a backflow valve, which is connected in series between the discharge end of the first oil inlet valve and the exhaust end of the oil-gas separator, and can realize oil discharging / supplementing under a live condition. The oil discharging and supplementing method is based on the aforementioned oil discharging and supplementing device.

Description

Technical Field

[0001] This invention relates to the field of power maintenance technology, specifically to a device and method for draining and replenishing oil in power equipment with low oil levels. Background Technology

[0002] Low-oil power equipment mainly refers to low-oil circuit breakers. Their core characteristic is the use of significantly less insulating oil than high-oil circuit breakers, with the oil primarily used for arc extinguishing. The equipment's insulation relies mainly on solid insulating components and air. Due to its advantages such as low oil consumption, simpler structure, and lower cost, it has been widely used. To ensure stable power supply, periodic routine inspections and unscheduled anomaly checks are necessary for low-oil equipment.

[0003] Among them, oil-deficient equipment requires oil sampling during periodic routine inspections and irregular abnormal checks. With each sampling, the amount of insulating oil inside the equipment gradually decreases, affecting its insulation performance and posing a safety hazard. Particularly in the main transformer bushing, frequent oil sampling can easily create negative pressure inside the bushing, leading to two problems: first, negative pressure prevents further oil sampling, affecting equipment operation monitoring; second, negative pressure can cause backflow of air, accelerating moisture absorption of the insulating oil and compromising equipment safety. Therefore, it is necessary to replenish and drain oil from oil-deficient equipment. However, existing oil-deficient equipment requires opening the vent, allowing outside air to directly enter, and this must be done with the main equipment powered off. Summary of the Invention

[0004] To address the technical problem of existing power equipment with low oil levels requiring power outage for draining / replenishing oil, this invention provides a draining / replenishing device and method for power equipment with low oil levels. This device can automatically replenish oil and drain oil at high oil levels, meeting the usage needs of both scenarios where oil levels are low and require replenishment, and where oil levels are high and require draining, without needing to open the vent of the equipment with low oil levels. This enables emergency safety measures such as draining / replenishing oil while the power is on, ensuring the stable operation of the power line.

[0005] This invention is achieved through the following technical solution:

[0006] In a first aspect, the present invention provides an oil replenishment device for a low-oil power equipment, comprising: a first oil inlet valve, the inlet end of which is connected to an oil source; a bidirectional oil pump, one end of which is connected to the outlet end of the first oil inlet valve; an oil-gas separator, the oil inlet end of which is connected to the other end of the bidirectional oil pump, and the outlet end of which is equipped with a first exhaust valve, a first level gauge, and a second level gauge, wherein the first level gauge is used to monitor the liquid level of the oil-gas separator body, and the second level gauge is used to monitor the liquid level at the outlet end of the oil-gas separator; a first replenishment valve, one end of which is connected to the oil outlet end of the oil-gas separator, and the other end of which can be connected to a low-oil equipment; a second replenishment valve, which is connected in series between the bidirectional oil pump and the oil-gas separator; a second exhaust valve, the air inlet end of which is connected between the bidirectional oil pump and the oil-gas separator; and a return oil valve, which is connected in series between the outlet end of the first oil inlet valve and the outlet end of the oil-gas separator.

[0007] It should be noted that existing low-oil equipment requires opening the vent hole of the low-oil equipment when replenishing or draining oil. This operation must be performed with the main equipment powered off. Opening the vent hole of the low-oil equipment damages its original sealing structure, allowing external air to enter and affecting the normal operation of the low-oil equipment.

[0008] In view of this, the present invention provides an oil replenishment device for low-oil power equipment, comprising a first inlet valve, a bidirectional oil pump, an oil-gas separator, a first replenishment valve, a second replenishment valve, a second exhaust valve, and a return valve. One end of the bidirectional oil pump is connected to the discharge end of the first inlet valve. The oil inlet end of the oil-gas separator is connected to the other end of the bidirectional oil pump, and the exhaust end is equipped with a first exhaust valve, a first level gauge, and a second level gauge. One end of the first replenishment valve is connected to the oil outlet end of the oil-gas separator, and the other end can be connected to the low-oil equipment. The second replenishment valve is connected in series between the bidirectional oil pump and the oil-gas separator. The second exhaust valve is connected between the bidirectional oil pump and the oil-gas separator. The return valve is connected in series between the discharge end of the first inlet valve and the exhaust end of the oil-gas separator.

[0009] Therefore, when replenishing oil to the low-oil equipment, the oil outlet of the first replenishing valve is connected to the low-oil power equipment, and the first replenishing valve, return valve, and second exhaust valve are opened. The first exhaust valve and the second replenishing valve are then closed, so that the insulating oil of the low-oil power equipment is pumped into the oil-gas separator to the trigger position of the first level gauge through the bidirectional oil pump. This discharges the gas between the oil-gas separator and the low-oil equipment and its connecting pipeline. Then, the return valve and the first exhaust valve are closed, and the second replenishing valve is opened, so that the insulating oil is input into the oil-gas separator to the trigger position of the second level gauge through the bidirectional oil pump. This discharges the gas between the oil-gas separator and the first inlet valve, ensuring that no gas is mixed in the entire pipeline. Finally, the second replenishing valve is closed, and the insulating oil is replenished into the low-oil equipment through the bidirectional oil pump. This achieves the replenishment of insulating oil and avoids the entry of external gas, enabling oil replenishment operations to be performed while the equipment is energized.

[0010] When oil drainage is required, the first oil replenishment valve, the oil return valve, and the second exhaust valve are opened, and the first exhaust valve and the second oil replenishment valve are closed. Then, the insulating oil of the low-oil power equipment is pumped into the oil-gas separator by the bidirectional oil pump and discharged from the second exhaust valve. This ensures that no external gas enters the low-oil equipment during the oil drainage process, enabling the oil drainage operation to be carried out while the power is on.

[0011] In summary, the oil replenishment and drainage device for low-oil power equipment provided by this invention can automatically replenish oil for low-oil power equipment and drain oil when the oil level is high, meeting the usage needs of two scenarios: replenishing oil when the oil level of low-oil equipment is reduced and draining oil when the oil level is high. It does not require opening the vent of the low-oil equipment, enabling emergency safety handling of oil replenishment / drainage under energized conditions, and ensuring the stable operation of power lines.

[0012] In an optional embodiment of this application, the oil outlet of the oil-gas separator is equipped with a first pressure gauge and a flow meter. On the one hand, the flow meter facilitates the acquisition and control of the amount of insulating oil added, and facilitates the adjustment of the oil replenishment speed and the implementation of different flow rates. On the other hand, the first pressure gauge can monitor the internal pressure of the equipment with low oil content, and can perform sealing tests on the main transformer bushing after maintenance.

[0013] In an optional embodiment of this application, a second pressure gauge is also connected between the bidirectional oil pump and the oil-gas separator to monitor the output pressure of the bidirectional oil pump in real time, thereby obtaining the replenishment pressure.

[0014] In an optional embodiment of this application, a first filter is connected in series between the second oil replenishing valve and the oil-gas separator to finely filter the replenished insulating oil to remove tiny impurities and ensure the quality of the replenished insulating oil.

[0015] In addition, after the oil has undergone extensive processing and testing in the warehouse and passed the tests, it is then transferred to small containers and taken to the site for refueling, which can easily cause secondary contamination of the oil and reduce its quality.

[0016] In view of this, in an optional embodiment of this application, the oil reservoir is further comprising: an oil reservoir for storing insulating oil, adapted to a stirrer and a third level gauge; a heater connected to the oil inlet end of the oil reservoir; a second filter connected to the oil outlet end of the oil reservoir; and a vacuum pump, the suction end of which is connected to the exhaust end of the oil reservoir. The oil outlet end of the second filter is connected to the first oil inlet valve via a second drain valve, so that the oil reservoir is vacuumed by the vacuum pump to remove water vapor, the insulating oil is stirred by the stirrer adapted to the oil reservoir, the level of the oil reservoir is monitored by the third level gauge, the insulating oil in the oil reservoir is finely filtered by the second filter to remove small-to-medium-sized impurities, and the insulating oil entering the oil reservoir is heated by the heater, so that the insulating oil stored in the oil reservoir meets the replenishment requirements.

[0017] In an optional embodiment of this application, the exhaust end of the oil reservoir is also connected to a third pressure gauge, a third exhaust valve, and an air dryer. The third pressure gauge can monitor the vacuum level inside the oil reservoir in real time, and the third exhaust valve and the air dryer can work together to input dry gas into the vacuum pump to dry the vacuum pump.

[0018] In an optional embodiment of this application, a gas collecting tank is connected between the vacuum pump and the oil reservoir. The upper part of the gas collecting tank is connected to the vacuum pump and the oil reservoir respectively, and the bottom of the gas collecting tank is connected to a first drain valve to separate water and gas in the medium entering the vacuum pump through the gas collecting tank, so as to protect the vacuum pump. At the same time, by opening the first drain valve, the liquid mixture in the gas collecting tank can be discharged.

[0019] In an optional embodiment of this application, a circulation pump is further included. The circulation pump is connected between the oil outlet of the second filter and the oil inlet of the heater to drive the insulating oil in the oil reservoir to circulate between the oil reservoir, the second filter and the heater, so as to ensure that the insulating oil output from the second drain valve meets the oil replenishment requirements.

[0020] In an optional embodiment of this application, a third filter is also included, which is connected to the oil inlet of the heater to coarsely filter the insulating oil entering the heater, thereby removing larger impurities.

[0021] In addition, the oil-gas separator in this application operates in two ways: separating oil and gas and temporarily storing oil during oil replenishment and drainage. If a conventional mist eliminator is used, the mist eliminator will be submerged in the oil during the oil replenishment and drainage process, resulting in poor oil-gas separation or even ineffective oil-gas separation. This makes it difficult for the separator to perform oil-gas separation again, requiring replacement after each use, which leads to high operating costs and increased replacement operations.

[0022] In an optional embodiment of this application, the oil-gas separator includes a separation container, which is a shell structure closed at both ends. The lower end has a first interface and a second interface, and the upper end has a third interface and a fourth interface. The first interface is connected to the second replenishing valve, the second interface is connected to the first replenishing valve, the third interface is connected to the return oil valve, and the fourth interface is connected to the first exhaust valve. A mist eliminator, installed in the upper section of the inner cavity of the separation container and adapted to the inner cavity, includes an electromagnet ring and multiple layers of mist-eliminating wire mesh rings. The electromagnet ring is located above the multiple layers of mist-eliminating wire mesh rings, and a return spring is provided between adjacent layers of mist-eliminating wire mesh rings. The mist-eliminating wire mesh ring directly opposite the electromagnet ring is adapted with a permanent magnet ring. When the electromagnet ring is energized, the permanent magnet ring presses tightly against the multiple layers of mist-eliminating wire mesh rings, causing the wire mesh of adjacent layers of mist-eliminating wire mesh rings to adhere and driving the return spring to store energy.

[0023] Therefore, when using the system for the first time and performing oil-gas separation, the power supply to the electromagnet ring is disconnected. The multi-layered mist-catching mesh rings, supported by the return springs, are spaced apart and can efficiently capture oil mist in the gas, thus achieving effective oil-gas separation. When temporarily storing oil during replenishment, the power supply to the electromagnet ring is turned on, causing the magnetic poles of the electromagnet ring to be opposite to those of the permanent magnet ring. That is, the lower magnetic pole of the electromagnet ring is the same as the upper magnetic pole of the permanent magnet ring. At this time, under the repulsive force of the electromagnet ring, the permanent magnet ring tightly presses against the multi-layered mist-catching mesh rings, causing the meshes of adjacent layers to adhere and driving the return springs to store energy, thus forming a dense mesh layer. When the oil is immersed in the multi-layered mist-catching mesh, oil droplets directly adhere to the mesh.

[0024] When oil-gas separation is required again, the multi-layer mist-catching wire mesh ring is exposed above the oil surface. Residual oil droplets adhere directly to the multi-layer wire mesh. When the power supply to the electromagnet ring is disconnected, the repulsive force exerted by the electromagnet ring on the permanent magnet ring disappears. Under the action of the return spring, the adjacent two layers of mist-catching wire mesh rings are driven to quickly separate. This causes most of the oil droplets attached to the multi-layer wire mesh to be thrown away from each layer of mist-catching wire mesh under inertia. Furthermore, the residual oil droplets are distributed on the multi-layer wire mesh and spread out by the wire mesh of the multi-layer mist-catching wire mesh ring. Therefore, the multi-layer mist-catching wire mesh ring still has a high oil mist capture capacity and can effectively separate oil and gas without replacing the entire mist eliminator, thereby reducing maintenance costs and simplifying maintenance procedures.

[0025] Secondly, the present invention provides a method for replenishing and draining oil in a low-oil power equipment, based on the aforementioned oil replenishment and draining device for a low-oil power equipment, comprising an oil replenishment operation and an oil draining operation, wherein the oil replenishment operation includes the following steps:

[0026] Connect the oil outlet of the first oil replenishing valve to the low-oil power equipment, and open the first oil replenishing valve, the return oil valve, and the second exhaust valve, and close the first exhaust valve and the second oil replenishing valve.

[0027] The insulating oil of the low-oil power equipment is pumped into the oil-gas separator to the trigger position of the first level gauge by a bidirectional oil pump.

[0028] Close the return oil valve and the second exhaust valve, and open the second replenishing oil valve. Use the bidirectional oil pump to supply insulating oil to the oil-gas separator until the second level gauge is triggered.

[0029] Close the first exhaust valve and use a bidirectional oil pump to replenish the insulating oil into the equipment with low oil levels;

[0030] The oil removal operation includes the following steps:

[0031] Connect the oil outlet of the first oil replenishing valve to the low-oil power equipment, and open the first oil replenishing valve, the return oil valve, and the second exhaust valve, and close the first exhaust valve and the second oil replenishing valve.

[0032] The insulating oil of the low-oil power equipment is pumped into the oil-gas separator by a bidirectional oil pump and discharged from the second exhaust valve.

[0033] The oil replenishment and drainage method for low-oil power equipment provided by this invention, based on the aforementioned oil replenishment and drainage device for low-oil power equipment, includes oil replenishment and drainage operations. It can automatically replenish oil for low-oil power equipment and drain oil at high oil levels, meeting the usage needs of two scenarios: oil replenishment when the oil level of low-oil equipment decreases and oil drainage when the oil level is high. It does not require opening the vent of the low-oil equipment, enabling emergency safety handling of oil replenishment / drainage while the power is on, and ensuring the stable operation of the power line.

[0034] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0035] 1. The oil replenishment device for low-oil power equipment provided by the present invention includes a first oil inlet valve, a bidirectional oil pump, an oil-gas separator, a first replenishment valve, a second replenishment valve, a second exhaust valve, and a return valve. One end of the bidirectional oil pump is connected to the discharge end of the first oil inlet valve. The oil inlet end of the oil-gas separator is connected to the other end of the bidirectional oil pump. The exhaust end is equipped with a first exhaust valve, a first level gauge, and a second level gauge. One end of the first replenishment valve is connected to the oil outlet end of the oil-gas separator, and the other end can be connected to the low-oil equipment. The second replenishment valve is connected in series with the bidirectional oil pump. Between the pump and the oil-gas separator, the second exhaust valve is connected between the bidirectional oil pump and the oil-gas separator, and the return oil valve is connected in series between the discharge end of the first oil inlet valve and the exhaust end of the oil-gas separator. This allows for the replenishment of insulating oil while preventing the entry of external gas. It enables oil replenishment operations to be performed under energized conditions. During the oil draining process, no external gas enters the low-oil equipment, enabling oil draining operations to be performed under energized conditions. This allows for emergency safety handling of oil draining / replenishment under energized conditions, ensuring the stable operation of power lines.

[0036] 2. The oil replenishment and drainage method for low-oil power equipment provided by the present invention, based on the aforementioned oil replenishment and drainage device for low-oil power equipment, includes oil replenishment operation and oil drainage operation. It can automatically replenish oil and drain oil at high oil levels for low-oil power equipment, meeting the usage needs of two scenarios: oil replenishment when the oil level of low-oil equipment decreases and oil drainage when the oil level is high. It does not require opening the vent of the low-oil equipment, realizing emergency safety handling of oil replenishment / drainage under energized conditions, and ensuring the stable operation of power lines. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] In the attached diagram:

[0039] Figure 1 A schematic diagram of the pipeline for the oil draining and replenishing device of a low-oil power equipment provided in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the oil-gas separator in the oil-gas separation state provided in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the oil-gas separator in the oil draining / replenishing state according to an embodiment of the present invention.

[0042] The attached figures include reference numerals and their corresponding component names:

[0043] 1-First oil inlet valve, 2-Two-way oil pump, 3-Oil-gas separator, 310-Separation container, 311-First port, 312-Second port, 313-Third port, 314-Fourth port, 320-Mist eliminator, 321-Electromagnetic ring, 322-Mist eliminator wire mesh ring, 323-Permanent magnet ring, 324-Reset spring, 4-First exhaust valve, 5-First level gauge, 6-Second level gauge, 7-First oil replenishing valve, 8-Second oil replenishing valve, 9-First pressure gauge, 10-Flow meter, 11-Second pressure gauge, 13-First filter 14-Return oil valve, 15-Oil reservoir, 16-Agitator, 17-Third level gauge, 18-Multi-parameter monitor, 19-Heater, 20-Temperature controller, 21-Second filter, 22-Vacuum pump, 23-Second drain valve, 24-Third pressure gauge, 25-Third exhaust valve, 26-Air dryer, 27-Gas collection tank, 28-First drain valve, 29-Circulation pump, 30-Circulation control valve, 31-Third filter, 32-Second drain valve, 36-Second exhaust valve, 37-Second inlet valve, 38-Atomizing nozzle. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0046] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0047] In the description of the embodiments of this application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0048] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] It should be noted that existing low-oil equipment requires opening the vent port during oil replenishment. This must be done with the main equipment powered off. Opening the vent port disrupts the equipment's sealing structure, allowing external air to enter and affecting its normal operation. Furthermore, the process of transferring oil from the warehouse after extensive processing and testing to small containers for on-site replenishment can easily lead to secondary contamination and reduced oil quality.

[0050] In response, the inventor has innovatively designed the following technical solution, and the specific implementation scheme of this application will be described in detail below with reference to the accompanying drawings.

[0051] Example 1

[0052] Combination Figure 1 This embodiment provides an oil replenishment device for power equipment with low oil consumption, including: a first oil inlet valve 1, with its inlet end connected to an oil source; a bidirectional oil pump 2, one end of which is connected to the outlet end of the first oil inlet valve 1; an oil-gas separator 3, with its inlet end connected to the other end of the bidirectional oil pump 2 and its outlet end equipped with a first exhaust valve 4, a first level gauge 5, and a second level gauge 6, wherein the first level gauge 5 is used to monitor the liquid level of the oil-gas separator 3 body, and the second level gauge 6 is used to monitor the liquid level at the outlet end of the oil-gas separator 3; a first replenishment valve 7, one end of which is connected to the outlet end of the oil-gas separator 3, and the other end of which can be connected to a low-oil equipment; a second replenishment valve 8, connected in series between the bidirectional oil pump 2 and the oil-gas separator 3; a second exhaust valve 36, with its inlet end connected between the bidirectional oil pump 2 and the oil-gas separator 3; and a return oil valve 14, connected in series between the outlet end of the first oil inlet valve 1 and the outlet end of the oil-gas separator 3.

[0053] It is understood that the oil outlet end of the oil-gas separator 3 is equipped with a first pressure gauge 9 and a flow meter 10. On the one hand, the flow meter 10 facilitates the acquisition and control of the amount of insulating oil added, and facilitates the adjustment of the oil replenishment speed and the implementation of different flow rates. On the other hand, the first pressure gauge 9 can monitor the internal pressure of the equipment with low oil content, and can perform a sealing test on the main transformer bushing after maintenance.

[0054] Correspondingly, a second pressure gauge 11 is also connected between the bidirectional oil pump 2 and the oil-gas separator 3 to monitor the output pressure of the bidirectional oil pump 2 in real time, thereby obtaining the replenishment pressure.

[0055] In this embodiment, a first filter 13 is connected in series between the second oil replenishment valve 8 and the oil-gas separator 3 to finely filter the replenished insulating oil to remove tiny impurities and ensure the quality of the replenished insulating oil.

[0056] In other words, the above-mentioned pipeline components are oil draining and replenishing actuators, mainly used for draining and replenishing oil in equipment with low oil levels.

[0057] The bidirectional oil pump 2 can push in both forward and reverse directions, and can be a centrifugal pump or other oil pump without a check valve. The inlet of the bidirectional oil pump 2 is equipped with a first inlet valve 1 and a quick-connect interface, which connects to the quick-connect interface for the oil output of the oil processing device. It can also be connected separately to an external container via a pipeline. A return valve 14 is provided between the first inlet valve 1 and the exhaust port of the oil-gas separator 3. The exhaust port of the oil-gas separator 3 is connected to the return valve 14 and the first exhaust valve 4, respectively. A second level gauge 6 (pipeline type) is provided on the upper part of the first exhaust valve 4. A second pressure gauge 11, a second replenishing valve 8, and a first filter 13 are provided between the outlet of the bidirectional oil pump 2 and the oil-gas separator 3. The other end of the oil-gas separator 3 is connected to the quick-connect interface for the oil outlet, and a first replenishing valve 7, a first pressure gauge 9, and a flow meter 10 are provided between them. Simultaneously, the bidirectional oil pump 2, the flow meter 10, the various pressure gauges and level gauges, the various inlet valves, and the various outlet valves are all controlled by a control unit.

[0058] In addition, in this application, the oil-gas separator 3 has the working conditions of performing oil-gas separation and temporarily storing oil during oil discharge and replenishment. If a conventional oil-gas separator is used, the mist eliminator will be submerged in the oil during the oil discharge and replenishment process, which will reduce its oil-gas separation effect or even prevent it from performing oil-gas separation effectively. This is not conducive to its oil-gas separation again. Therefore, it needs to be replaced after each use, resulting in high operating costs and increased replacement operations.

[0059] In this regard, combined with Figure 2 and Figure 3The oil-gas separator 3 provided in this embodiment includes a separation container 310, which is a shell structure closed at both ends. The lower end is provided with a first interface 311 and a second interface 312, and the upper end is provided with a third interface 313 and a fourth interface 314. The first interface 311 is connected to the second oil replenishment valve 8, the second interface 312 is connected to the first oil replenishment valve 7, the third interface 313 is connected to the oil return valve 14, and the fourth interface 314 is connected to the first exhaust valve 4. A mist eliminator 320 is installed in the upper section of the inner cavity of the separation container 310 and is adapted to the inner cavity of the separation container 310. The system includes an electromagnet ring 321 and a multi-layer mist-catching wire mesh ring 322. The electromagnet ring 321 is located above the multi-layer mist-catching wire mesh ring 322 and is fixedly connected to the separation container 310. A return spring 324 is provided between two adjacent layers of the mist-catching wire mesh ring 322. The mist-catching wire mesh ring 322 facing the electromagnet ring 321 is equipped with a permanent magnet ring 323. When the electromagnet ring 321 is energized, the permanent magnet ring 323 presses the multi-layer mist-catching wire mesh ring 322 tightly, causing the wire mesh of two adjacent layers of the mist-catching wire mesh ring 322 to adhere and driving the return spring 324 to store energy.

[0060] Therefore, when using it for the first time and when performing oil-gas separation, the power supply to the electromagnet ring 321 is disconnected, and the multi-layer mist-collecting wire mesh ring 322 is spaced apart under the support of the return spring 324. Figure 2 This system can efficiently capture oil mist in the gas, thus achieving effective oil-gas separation. When temporarily storing oil during replenishment, the power supply to the electromagnet ring 321 is turned on, causing the magnetic poles of the electromagnet ring 321 to be opposite to those of the permanent magnet ring 323. That is, the lower magnetic pole of the electromagnet ring 321 is the same as the upper magnetic pole of the permanent magnet ring 323. At this time, under the repulsive force of the electromagnet ring 321, the permanent magnet ring 323 tightly presses against the multi-layer mist-catching wire mesh ring 322, causing the wire mesh of adjacent two layers of mist-catching wire mesh rings 322 to adhere together. Figure 3 The energy is stored in the drive return spring 324, thereby forming a dense mesh layer. When the oil is immersed in the multi-layer mist-catching mesh, the oil droplets directly adhere to the multi-layer mesh.

[0061] When oil-gas separation is required again, the multi-layer mist-catching wire mesh ring 322 is exposed above the oil surface, and the residual oil droplets adhere directly to the multi-layer wire mesh. When the power supply to the electromagnet ring 321 is disconnected, the repulsive force exerted by the electromagnet ring 321 on the permanent magnet ring 323 disappears. Under the action of the return spring 324, the adjacent two layers of mist-catching wire mesh rings 322 are driven to quickly spring apart and be spaced apart. This causes most of the oil droplets attached to the multi-layer wire mesh to be thrown away from each layer of mist-catching wire mesh under inertia. Furthermore, the residual oil droplets are distributed on the multi-layer wire mesh and spread out by the wire mesh of the multi-layer mist-catching wire mesh ring 322, resulting in fewer oil droplets attached to the wire mesh of the mist-catching wire mesh ring 322. Therefore, the multi-layer mist-catching wire mesh ring 322 still has a high oil mist capture capacity and can effectively perform oil-gas separation without replacing the entire mist eliminator 320, thereby reducing maintenance costs and simplifying maintenance procedures.

[0062] Each layer of mist-catching wire mesh ring 322 includes a cylindrical support body. A wire mesh is stretched at the lower end of the support body, and a limiting shoulder is provided at the upper end. A return spring 324, a wave spring, is sleeved outside the support body and limited by the limiting shoulder. Simultaneously, the support body of the upper layer can be inserted into the support body of the lower layer. The return spring 324 is positioned between two adjacent limiting shoulders, thereby ensuring that the wire mesh of adjacent layers of mist-catching wire mesh rings 322 can fit together. Furthermore, a support shoulder is provided inside the separation container 310 to support the lowest layer of mist-catching wire mesh ring 322.

[0063] All of the above components are installed in the housing of the portable oil tank. The specific implementation is as follows: the bidirectional oil pump 2, the first filter 13, the flow meter 10, the oil-gas separator 3, the pressure gauge, the level gauge, the control unit and the pipeline are all installed in the portable housing. Of course, this embodiment also includes the control part relay, the relay fixing insulation plate and the connecting cable.

[0064] It is known that the oil replenishment device system is powered by a rechargeable battery. The rechargeable battery is fixed to the battery mounting bracket by a snap-on elastic band. The battery mounting bracket is installed on the base plate. Using a battery to power the system greatly reduces the cumbersome process of connecting the power supply on site.

[0065] Combined again Figure 1This embodiment also includes: an oil reservoir 15 for storing insulating oil, adapted with a stirrer 16 and a third level gauge 17; a heater 19 connected to the oil inlet of the oil reservoir 15; a second filter 21 connected to the oil outlet of the oil reservoir 15; and a vacuum pump 22, the suction end of which is connected to the exhaust end of the oil reservoir 15. The oil outlet of the second filter 21 is connected to the first oil inlet valve 1 via a second drain valve 23, so that the vacuum pump 22 can be used to evacuate the oil reservoir 15 to remove water vapor; the stirrer adapted to the oil reservoir 15 can be used to stir the insulating oil; the third level gauge 17 can be used to monitor the level of the oil reservoir 15; the second filter 21 can be used to finely filter the insulating oil in the oil reservoir 15 to remove small-sized impurities; and the heater 19 can be used to heat the insulating oil entering the oil reservoir 15, so that the insulating oil stored in the oil reservoir 15 meets the replenishment requirements.

[0066] Generally, the exhaust end of the oil reservoir 15 is also connected to a third pressure gauge 24, a third exhaust valve 25 and an air dryer 26. The third pressure gauge 24 can monitor the vacuum level in the oil reservoir 15 in real time, and the third exhaust valve 25 and the air dryer 26 can work together to input dry gas into the vacuum pump 22 to dry the vacuum pump 22.

[0067] Similarly, a gas collecting tank 27 is connected between the vacuum pump 22 and the oil reservoir 15. The upper part of the gas collecting tank 27 is connected to the vacuum pump 22 and the oil reservoir 15 respectively. The bottom of the gas collecting tank 27 is connected to a first drain valve 28 to separate water and gas in the medium entering the vacuum pump 22 through the gas collecting tank 27 to protect the vacuum pump 22. At the same time, by opening the first drain valve 28, the liquid mixture in the gas collecting tank 27 can be discharged.

[0068] Based on this, this embodiment also includes a circulation pump 29, which is connected between the oil outlet of the second filter 21 and the oil inlet of the heater 19, so as to drive the insulating oil in the oil reservoir 15 to circulate between the oil reservoir 15, the second filter 21 and the heater 19, so as to ensure that the insulating oil output from the second drain valve 23 meets the oil replenishment requirements.

[0069] Furthermore, this embodiment also includes a third filter 31, which is connected to the oil inlet of the heater 19 to coarsely filter the insulating oil entering the heater 19 to remove larger impurities.

[0070] That is, the aforementioned pipelines form an oil processing assembly, mainly used to process oil under different environments. Two filters are installed. One end of the third filter 31 is connected to the second inlet valve 37 and the quick-connect inlet interface, the other end is connected to the heater 19, and the lower part is connected to the second drain valve 32 and the drain port. The heater 19 is equipped with a temperature controller 20 to control the system oil temperature. The other end of the heater 19 is connected to the oil reservoir 15. The oil reservoir 15 has six functional interfaces: an exhaust port (vacuum system interface), an oil inlet, a stirrer interface, a secondary filter interface, a multi-parameter oil detection interface, and a liquid level control interface. One end of the exhaust port is sequentially connected to a third pressure gauge 24, a third exhaust valve 25, and an air dryer 26, and is also connected to a vacuum assembly. The vacuum assembly includes a vacuum pump 22, a gas collection tank 27, and a drain valve. The gas collection tank 27 has three interfaces, with the upper part connected to the vacuum pump 22 and the lower part connected to the drain valve. Furthermore, a circulation assembly is provided between the second filter 21 and the heater 19. The circulation assembly consists of a circulation pump 29 and a circulation control valve 30. The other end of the second filter 21 is provided with a quick-connect interface for oil output.

[0071] In this embodiment, the oil reservoir 15 is equipped with an atomizing device and a multi-parameter oil detector 39. The atomizing device can reduce the oil flow rate to increase the oil spraying area and thus improve the oil processing efficiency. The multi-parameter oil detector 39 mainly detects the water content and temperature in the oil. The stirrer 16 is used to ensure that the oil temperature reaches a uniform and constant level during the stirring process.

[0072] All the above components are installed in a portable housing. Specifically, the filter, heater 19, oil reservoir 15, vacuum assembly, circulation assembly, multi-parameter detector, control unit, and pipelines of the oil treatment device are all installed in the housing of the oil treatment box. The oil treatment box also includes control relays, relay mounting insulation plates, and connecting cables. Furthermore, the housing is equipped with system inlet / outlet ports, a power switch, and an emergency stop button.

[0073] In addition, to facilitate the testing of insulating oil, this embodiment also provides a dielectric strength tester. It is understood that the dielectric strength tester mainly consists of a high-voltage chamber, a high-voltage column, a shaft, electrodes, a feeler gauge, an oil cup, a shaft fixing screw, a magnetic inductor, cables, and a relay. It is suitable for testing the dielectric strength of various insulating oils and has the following functions:

[0074] 1) It has an automatic detection function, such as automatically entering the reset state upon power-on to return the voltage regulator to zero;

[0075] 2) Employs a mini TPU-A panel printer for automatic printing output;

[0076] 3) The number of tests, stirring, settling time, and sound and light-controlled reminders for continuous printing and non-printing can be changed according to user needs;

[0077] Meanwhile, a fully automatic magnetic stirrer is used to eliminate unevenness and air bubbles in the oil sample.

[0078] In summary, the oil replenishment device for low-oil power equipment provided in this embodiment includes a first inlet valve 1, a bidirectional oil pump 2, an oil-gas separator 3, a first replenishment valve 7, a second replenishment valve 8, a second exhaust valve 36, and a return valve 14. Specifically, one end of the bidirectional oil pump 2 is connected to the discharge end of the first inlet valve 1; the oil inlet end of the oil-gas separator 3 is connected to the other end of the bidirectional oil pump 2, and the exhaust end is equipped with a first exhaust valve 4, a first level gauge 5, and a second level gauge 6; one end of the first replenishment valve 7 is connected to the oil outlet end of the oil-gas separator 3, and the other end can be connected to the low-oil equipment; the second replenishment valve 8 is connected in series between the bidirectional oil pump 2 and the oil-gas separator 3; the second exhaust valve 36 is connected between the bidirectional oil pump 2 and the oil-gas separator 3; and the return valve 14 is connected in series between the discharge end of the first inlet valve 1 and the exhaust end of the oil-gas separator 3.

[0079] When replenishing oil to the low-oil equipment, connect the oil outlet of the first oil replenishing valve 7 to the low-oil power equipment, and open the first oil replenishing valve 7, return valve 14, and second exhaust valve 36. Close the first exhaust valve 4 and the second oil replenishing valve 8 to pump the insulating oil from the low-oil power equipment into the oil-gas separator 3 to the trigger position of the first level gauge 5 through the bidirectional oil pump 2. This discharges the gas between the oil-gas separator 3 and the low-oil equipment and its connecting pipeline. Then, close the return valve 14 and the second exhaust valve 36, and open the second oil replenishing valve 8 to input insulating oil into the oil-gas separator 3 to the trigger position of the second level gauge 6 through the bidirectional oil pump 2. This discharges the gas between the oil-gas separator 3 and the first oil inlet valve 1, ensuring that no gas is mixed in the entire pipeline. Finally, close the first exhaust valve 4 and replenish the insulating oil into the low-oil equipment through the bidirectional oil pump 2 to achieve the replenishment of insulating oil and prevent the entry of external gas. This allows for oil replenishment operations to be performed while the equipment is energized.

[0080] When oil needs to be drained, the first oil replenishment valve 7, the return oil valve 14, and the second exhaust valve 36 are opened, and the first exhaust valve 4 and the second oil replenishment valve 8 are closed. Then, the insulating oil of the low-oil power equipment is pumped into the oil-gas separator 3 by the bidirectional oil pump 2 and discharged from the second exhaust valve 36. This ensures that no external gas enters the low-oil equipment during the oil draining process, enabling the oil draining operation to be carried out under energized conditions.

[0081] In summary, the oil replenishment and drainage device for low-oil power equipment provided in this embodiment can automatically replenish oil for low-oil power equipment and drain oil when the oil level is high, meeting the usage needs of two scenarios: replenishing oil when the oil level of low-oil equipment is reduced and draining oil when the oil level is high. It does not require opening the vent of the low-oil equipment, enabling emergency safety handling of oil draining / replenishment in a live state, and ensuring the stable operation of the power line.

[0082] Example 2

[0083] Combination Figure 1 This embodiment provides a method for replenishing and draining oil in a low-oil power equipment, based on the oil replenishing and draining device for a low-oil power equipment described in Embodiment 1, including an oil replenishment operation and an oil draining operation.

[0084] The refueling operation includes the following steps:

[0085] S10. Connect the oil outlet of the first oil replenishing valve 7 to the low-oil power equipment, and open the first oil replenishing valve 7, the return oil valve 14 and the second exhaust valve 36, and close the first exhaust valve 4 and the second oil replenishing valve 8.

[0086] S11. The insulating oil of the power low-oil equipment is pumped into the oil-gas separator 3 to the trigger position of the first level gauge 5 by the bidirectional oil pump 2.

[0087] S12. Close the return oil valve 14 and the second exhaust valve 36, and open the second replenishing oil valve 8. Use the bidirectional oil pump 2 to supply insulating oil to the oil-gas separator 3 to the trigger position of the second level gauge 6.

[0088] S13. Close the first exhaust valve 4 and use the bidirectional oil pump 2 to replenish the low-oil equipment with insulating oil.

[0089] The oil removal operation includes the following steps:

[0090] S20. Connect the oil outlet of the first oil replenishing valve 7 to the low-oil power equipment, and open the first oil replenishing valve 7, the return oil valve 14 and the second exhaust valve 36, and close the first exhaust valve 4 and the second oil replenishing valve 8.

[0091] S21. The insulating oil of the power low-oil equipment is pumped into the oil-gas separator 3 by the bidirectional oil pump 2 and discharged from the second exhaust valve 36.

[0092] Specifically, when oil replenishment is required, the oil outlet of the first oil replenishment valve 7 is connected to the low-oil power supply equipment. The first oil replenishment valve 7, the return oil valve 14, and the second exhaust valve 36 are opened, while the first exhaust valve 4 and the second oil replenishment valve 8 are closed. This allows the insulating oil from the low-oil power supply equipment to be pumped into the oil-gas separator 3 to the trigger position of the first level gauge 5 via the bidirectional oil pump 2. This removes the gas between the oil-gas separator 3 and the low-oil power supply equipment and their connecting pipelines. Then, the return oil valve 14 and the second exhaust valve 36 are closed, and the second oil replenishment valve 8 is opened. This allows the bidirectional oil pump 2 to supply insulating oil to the oil-gas separator 3 to the trigger position of the second level gauge 6. This removes the gas between the oil-gas separator 3 and the first inlet valve 1, ensuring that no gas is mixed into the entire pipeline. Finally, the first exhaust valve 4 is closed, and the bidirectional oil pump 2 replenishes the insulating oil into the low-oil power supply equipment. This achieves the replenishment of insulating oil and prevents the entry of external gas, enabling oil replenishment operations to be performed while the system is energized.

[0093] When oil drainage is required, the first oil replenishment valve 7, the return oil valve 14, and the second exhaust valve 36 are opened, and the first exhaust valve 4 and the second oil replenishment valve 8 are closed. Then, the insulating oil of the low-oil power equipment is pumped into the oil-gas separator 3 by the bidirectional oil pump 2 and discharged from the second exhaust valve 36. This ensures that no external gas enters the low-oil equipment during the oil drainage process, enabling the oil drainage operation to be carried out under energized conditions.

[0094] Therefore, the oil replenishment and drainage method for low-oil power equipment provided in this embodiment can automatically replenish oil and drain oil when the oil level is high, meeting the usage needs of two scenarios: replenishing oil when the oil level of the low-oil equipment is low and draining oil when the oil level is high. It does not require opening the vent of the low-oil equipment, thus enabling emergency safety handling of oil replenishment / drainage under energized conditions and ensuring the stable operation of the power line.

[0095] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A power equipment with low oil levels, characterized in that, include: The first oil inlet valve (1) has an inlet end used to connect to the oil source; A two-way oil pump (2) is connected at one end to the discharge end of the first oil inlet valve (1); The oil-gas separator (3) has an oil inlet end connected to the other end of the bidirectional oil pump (2) and an exhaust end equipped with a first exhaust valve (4), a first level gauge (5) and a second level gauge (6). The first level gauge (5) is used to monitor the liquid level of the oil-gas separator (3) body, and the second level gauge (6) is used to monitor the liquid level at the exhaust end of the oil-gas separator (3). The first oil replenishing valve (7) is connected at one end to the oil outlet of the oil-gas separator (3) and at the other end to a low-oil device. The second oil replenishing valve (8) is connected in series between the bidirectional oil pump (2) and the oil-gas separator (3); The second exhaust valve (36) has its inlet end connected between the bidirectional oil pump (2) and the oil-gas separator (3); The return valve (14) is connected in series between the discharge end of the first inlet valve (1) and the exhaust end of the oil-gas separator (3); The process of adding or removing oil includes both adding and removing oil. The adding or removing oil operation includes the following steps: Connect the oil outlet of the first oil replenishing valve (7) to the low-oil power equipment, and open the first oil replenishing valve (7), the return oil valve (14) and the second exhaust valve (36), and close the first exhaust valve (4) and the second oil replenishing valve (8). The insulating oil of the power low-oil equipment is pumped into the oil-gas separator (3) by the bidirectional oil pump (2) to the trigger position of the first level gauge (5); Close the return oil valve (14) and the second exhaust valve (36), and open the second replenishing oil valve (8). Insulating oil is supplied to the oil-gas separator (3) through the bidirectional oil pump (2) to the trigger position of the second level gauge (6). Close the first exhaust valve (4) and replenish the insulating oil into the low-oil equipment through the bidirectional oil pump (2); The oil removal operation includes the following steps: Connect the oil outlet of the first oil replenishing valve (7) to the low-oil power equipment, and open the first oil replenishing valve (7), the return oil valve (14) and the second exhaust valve (36), and close the first exhaust valve (4) and the second oil replenishing valve (8). The insulating oil of the power low-oil equipment is pumped into the oil-gas separator (3) by the bidirectional oil pump (2) and discharged from the second exhaust valve (36).

2. The oil replenishment device for low-oil power equipment according to claim 1, characterized in that, The oil outlet of the oil-gas separator (3) is equipped with a first pressure gauge (9) and a flow meter (10).

3. The oil replenishment device for low-oil power equipment according to claim 1, characterized in that, A second pressure gauge (11) is also connected between the bidirectional oil pump (2) and the oil-gas separator (3).

4. The oil replenishment device for low-oil power equipment according to claim 1, characterized in that, A first filter (13) is connected in series between the second oil replenishing valve (8) and the oil-gas separator (3).

5. The oil replenishment device for low-oil power equipment according to any one of claims 1 to 4, characterized in that, Also includes: Oil reservoir (15) for storing insulating oil, adapted to be equipped with a stirrer (16) and a third level gauge (17). A heater (19) is connected to the oil inlet end of the oil reservoir (15); The second filter (21) is connected to the oil outlet end of the oil reservoir (15); The vacuum pump (22) has its suction end connected to the exhaust end of the oil reservoir (15); A circulation pump (29) is connected between the oil outlet of the second filter (21) and the oil inlet of the heater (19); The oil outlet of the second filter (21) is connected to the first oil inlet valve (1) via the second drain valve (23).

6. The oil replenishment device for low-oil power equipment according to claim 5, characterized in that, The exhaust end of the oil reservoir (15) is also connected to a third pressure gauge (24), a third exhaust valve (25), and an air dryer (26).

7. The oil replenishment device for low-oil power equipment according to claim 5, characterized in that, A gas collection tank (27) is connected between the vacuum pump (22) and the oil reservoir (15). The upper part of the gas collection tank (27) is connected to the vacuum pump (22) and the oil reservoir (15) respectively, and the bottom of the gas collection tank (27) is connected to a first drain valve (28).

8. The oil replenishment device for low-oil power equipment according to claim 5, characterized in that, It also includes a third filter (31), which is connected to the oil inlet of the heater (19).

9. The oil replenishment device for low-oil power equipment according to claim 1, characterized in that, The oil-gas separator (3) includes: The separation container (310) is a shell structure with closed ends. The lower end is provided with a first interface (311) and a second interface (312), and the upper end is provided with a third interface (313) and a fourth interface (314). The first interface (311) is connected to the second oil replenishing valve (8), the second interface (312) is connected to the first oil replenishing valve (7), the third interface (313) is connected to the oil return valve (14), and the fourth interface (314) is connected to the first exhaust valve (4). A fog eliminator (320) is installed in the upper part of the inner cavity of the separation container (310) and is adapted to the inner cavity of the separation container (310). It includes an electromagnet ring (321) and a multi-layer fog eliminator mesh ring (322). The electromagnet ring (321) is located above the multi-layer fog eliminator mesh ring (322). A return spring (324) is provided between two adjacent layers of fog eliminator mesh ring (322). Among them, the fog-catching wire mesh ring (322) facing the electromagnet ring (321) is equipped with a permanent magnet ring (323). When the electromagnet ring (321) is energized, the permanent magnet ring (323) presses the multiple layers of the fog-catching wire mesh ring (322) tightly, so that the wire mesh of the two adjacent layers of the fog-catching wire mesh ring (322) are in contact and drive the reset spring (324) to store energy.

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