A combined device and method for replacing hydraulic oil of a circuit breaker hydraulic mechanism

Abstract

The application discloses a combined device for replacing hydraulic oil of a circuit breaker hydraulic mechanism, which comprises at least a vacuumizing device, at least one oil-gas separating and oil injecting device, a filtering device and corresponding connecting pipelines. By connecting and matching the devices and the circuit breaker hydraulic mechanism, on-line purification of the hydraulic oil, recovery of the hydraulic oil, purification or vacuumizing and oil injecting of the hydraulic oil and other treatment operations can be realized. The application also discloses corresponding methods. By implementing the application, the efficiency of replacing the hydraulic oil can be improved, the amount of the hydraulic oil can be reduced, and cost can be saved.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker hydraulic press technology, and in particular to a combined device and method for changing hydraulic oil in the hydraulic mechanism of a circuit breaker. Background Technology

[0002] In power supply equipment, the hydraulic mechanism of a high-voltage circuit breaker undergoes repeated pressure build-up, natural pressure drop, or operational pressure drop, followed by pressure replenishment during long-term operation. During this process, due to mechanical wear, the impurities in the internal hydraulic oil continuously increase, necessitating oil replacement during routine maintenance.

[0003] In existing technologies, hydraulic oil replacement is typically done manually using a manual pump. This method suffers from low on-site work efficiency, incomplete oil replacement, and the use of large quantities of hydraulic oil, increasing maintenance costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a combined device and method for changing hydraulic oil in the hydraulic mechanism of a circuit breaker, which can realize functions such as online purification of hydraulic oil, hydraulic oil recovery and purification, and vacuum injection, thereby improving the efficiency of changing hydraulic oil, reducing the amount of hydraulic oil used, and saving costs.

[0005] The technical solution adopted in this invention is to provide a combined device for changing hydraulic oil in the hydraulic mechanism of a circuit breaker, comprising:

[0006] A vacuum pumping device includes a vacuum pump, a first end of a first valve ZF1 connected to the vacuum pump, and a pressure gauge connected to the second end of the first valve ZF1.

[0007] At least one oil-gas separation and oil injection device, each oil-gas separation and oil injection device includes a pressure vessel, on which a first bottom valve YF1, a second bottom valve YF2 and a top valve YF3 are provided. The first ends of the first bottom valve and the second bottom valve are both connected to the bottom of the pressure vessel through a pipe, and the first end of the top valve is connected to the top of the pressure vessel through a pipe.

[0008] A filtration device comprising two series-connected compression filters, with a second valve ZF2 first end connected to one end of the series-connected compression filters, a circulating oil pump connected in sequence to the other end of the series-connected compression filters, and a one-way valve first end connected to the other end of the circulating oil pump.

[0009] At least one oil replenishment valve SF1 and an oil discharge valve SF2 are provided on the hydraulic mechanism of the circuit breaker;

[0010] The vacuuming device, oil-gas separator and oil device, filter device, and circuit breaker hydraulic mechanism are connected and cooperate with each other so that the combined device is in the process of online hydraulic oil purification, hydraulic oil recovery, hydraulic oil purification, or vacuuming and oil injection.

[0011] Preferably, when the combined device is in the online hydraulic oil purification state, the second end of the second bottom valve YF2 on the oil-gas separation and oil injection device is connected to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism, and the second end of the first bottom valve YF1 is connected to the second end of the second valve ZF2 of the filter device; the second end of the one-way valve of the filter device is connected to the oil discharge valve SF2 of the circuit breaker hydraulic mechanism; and the top valve YF3 on the oil-gas separation and oil injection device is closed.

[0012] Preferably, when the combined device is in the hydraulic oil recovery processing state, the second end of the first bottom valve YF1 on the oil-gas separation and oil injection device is connected to the second end of the second valve ZF2 of the filter device; the second end of the one-way valve of the filter device is connected to the drain valve SF2 of the circuit breaker hydraulic mechanism; and the second bottom valve YF2 on the oil-gas separation and oil injection device is closed.

[0013] Preferably, when the combined device is in the hydraulic oil purification treatment state, the second end of the second bottom valve YF2 on the oil-gas separation and oil injection device is connected to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism, and the second end of the first bottom valve YF1 is connected to the second end of the one-way valve of the filter device; and the top valve YF3 on the oil-gas separation and oil injection device is closed.

[0014] Preferably, when the combined device is in the vacuuming and oil injection process, the second end of the second bottom valve YF2 on the first oil-gas separation and oil injection device is connected to the oil discharge valve SF2 of the circuit breaker hydraulic mechanism, and its first bottom valve YF1 and top valve YF3 are closed.

[0015] The second end of the first bottom valve YF1 on the second oil-gas separation and oil injection device is connected to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism; its top valve YF3 is connected to the second end of the first valve ZF1 of the vacuum device.

[0016] During vacuuming, the second bottom valve YF2 on the second oil-gas separation and oil injection device is closed; during oil injection, the second bottom valve YF2 on the second oil-gas separation and oil injection device is opened for vacuum oil injection.

[0017] In another aspect, the present invention provides a method for changing hydraulic oil in a circuit breaker hydraulic mechanism, which is implemented using the aforementioned combined device, the method comprising the following steps:

[0018] Step S1: Connect the oil-gas separation and oil device, the filter device and the circuit breaker hydraulic mechanism, so that the combined device is in the state of online hydraulic oil purification or in the state of hydraulic oil recovery and purification, and purify the circuit breaker hydraulic mechanism.

[0019] Step S2: Connect the vacuuming device, oil-gas separator and oil device, filter device and circuit breaker hydraulic mechanism to put the combined device into a vacuuming and oil injection state, and perform vacuuming and oil injection on the combined device.

[0020] Preferably, step S1 further includes:

[0021] Step S10: Connect the second end of the second bottom valve YF2 on the oil-gas separation and oil injection device to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism; connect the second end of the first bottom valve YF1 to the second end of the second valve ZF2 of the filter device; connect the second end of the one-way valve of the filter device to the oil discharge valve SF2 of the circuit breaker hydraulic mechanism.

[0022] Step S11: Inject 1 liter of hydraulic oil into the oil-gas separation and injection device, close the top valve YF3 on the oil-gas separation and injection device, open other valves, and start the circulating oil pump in the filter device to achieve online purification of the hydraulic oil of the circuit breaker hydraulic mechanism.

[0023] Preferably, step S1 further includes:

[0024] Step S12: Connect the second end of the first bottom valve YF1 on the oil-gas separation and oil injection device to the second end of the second valve ZF2 of the filter device; connect the second end of the one-way valve of the filter device to the oil discharge valve SF2 of the circuit breaker hydraulic mechanism.

[0025] Step S13: Close the second bottom valve YF2 on the oil-gas separation and oil injection device, open other valves, start the circulating oil pump in the filter device to recover the hydraulic oil inside the hydraulic mechanism; and after the recovery is completed, disconnect the circuit breaker hydraulic mechanism from the oil-gas separation and oil injection device and the filter device.

[0026] Step S14: Connect the second end of the first bottom valve YF1 on the oil-gas separation and oil injection device to the second end of the one-way valve of the filter device;

[0027] Step S15: Close the top valve YF3 on the oil-gas separation and oil injection device, open other valves, and start the circulating oil pump in the filter device to achieve the purification treatment of hydraulic oil.

[0028] Preferably, step S2 further includes:

[0029] Step S20: Connect the second end of the second bottom valve YF2 on the first oil-gas separation and oil injection device to the oil discharge valve SF2 of the circuit breaker hydraulic mechanism; connect the second end of the first bottom valve YF1 on the second oil-gas separation and oil injection device to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism; connect its top valve YF3 to the second end of the first valve ZF1 of the vacuum device.

[0030] Step S21: Inject qualified hydraulic oil into the first oil-gas separation and injection device, close the second bottom threshold valve YF2 of the second oil-gas separation and injection device, close the first bottom valve YF1 and top valve YF3 of the first oil-gas separation and injection device, open other valves, start the vacuum pump in the vacuuming device, and perform vacuuming.

[0031] Step S22: After the pressure gauge displays the predetermined value, open the second bottom valve YF2 on the second oil-gas separation and oil injection device to perform vacuum oil injection. After the oil level reaches the required position, the vacuum oil injection work is completed.

[0032] Implementing the embodiments of the present invention has the following beneficial effects:

[0033] This invention provides a combined device and method for changing hydraulic oil in the hydraulic mechanism of a circuit breaker. By setting up a vacuum device, an oil-gas separator, an oil device, and a filter device, and by utilizing the connection and cooperation between these devices and the hydraulic mechanism of the circuit breaker, online purification, hydraulic oil recovery, hydraulic oil purification, or vacuum oil injection can be achieved. Implementing this invention can improve the efficiency of changing hydraulic oil, reduce the amount of hydraulic oil used, and save costs. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of a combined device for changing hydraulic oil in the hydraulic mechanism of a circuit breaker, provided by the present invention.

[0036] Figure 2 for Figure 1 Schematic diagram of the vacuum pumping device;

[0037] Figure 3 for Figure 1 Schematic diagram of the oil-gas separation and oil injection unit;

[0038] Figure 4 for Figure 1 A schematic diagram of a medium-compression filtration device;

[0039] Figure 5 for Figure 1 Schematic diagram of the hydraulic mechanism of the circuit breaker;

[0040] Figure 6 This is a schematic diagram of the connection for online hydraulic oil purification in this invention;

[0041] Figure 7 This is a schematic diagram of the hydraulic oil recovery process in this invention.

[0042] Figure 8 This is a schematic diagram of the hydraulic oil purification process in this invention.

[0043] Figure 9 This is a schematic diagram of the connection for vacuum oil injection in this invention;

[0044] Figure 10 This is a schematic diagram of the main flow of an embodiment of a method for changing hydraulic oil in the hydraulic mechanism of a circuit breaker provided by the present invention. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0046] Figure 1 This is a schematic diagram of an embodiment of a combined device for changing hydraulic oil in a circuit breaker hydraulic mechanism provided by the present invention, and is combined with... Figures 2 to 9 As shown, in this embodiment, the combined device includes at least: a vacuum pumping device, at least one oil-gas separation and oil injection device, a filter device, and corresponding connecting pipes. Wherein:

[0047] like Figure 2 As shown, the vacuum pumping device includes a vacuum pump ZKB, a first valve ZF1 connected to the first end of the vacuum pump, and a pressure gauge YLB connected to the second end of the first valve ZF1.

[0048] like Figure 3As shown, each oil-gas separation and oil injection device includes a pressure vessel, on which a first bottom valve YF1, a second bottom valve YF2, and a top valve YF3 are installed. The first ends of the first bottom valve YF1 and the second bottom valve YF2 are both connected to the bottom of the pressure vessel through a pipe, and the first end of the top valve YF3 is connected to the top of the pressure vessel through a pipe. Generally, each oil-gas separation and oil injection device is equipped with an exhaust (suction) pipe. In one example, the capacity of the pressure vessel is 5L.

[0049] like Figure 4 As shown, the filtration device includes two series-connected compression filters (GLQ1, GLQ2). One end of the series-connected compression filters is connected to the first end of the second valve ZF2, and the other end of the series-connected compression filters is connected to a circulating oil pump YB. The other end of the circulating oil pump YB is connected to the first end of the one-way valve NZF. In this invention, the filtration device adopts a two-stage filtration, which can improve the filtration effect.

[0050] like Figure 5 As shown, the circuit breaker hydraulic mechanism is equipped with at least a replenishing oil valve SF1 and a drain oil valve SF2.

[0051] The vacuuming device, oil-gas separator and oil separator, filter, and circuit breaker hydraulic mechanism are interconnected to enable the combined device to perform online hydraulic oil purification, hydraulic oil recovery, hydraulic oil purification, or vacuum oil injection processes. More specifically, the connections between the various devices can be achieved through pipelines and quick-connect fittings (KJTs).

[0052] like Figure 5 As shown, when the combined device is in the online hydraulic oil purification state, the second end of the second bottom valve YF2 on the oil-gas separation and oil injection device is connected to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism, and the second end of the first bottom valve YF1 is connected to the second end of the second valve ZF2 of the filter device; the second end of the one-way valve of the filter device is connected to the oil discharge valve SF2 of the circuit breaker hydraulic mechanism; and the top valve YF3 on the oil-gas separation and oil injection device is closed.

[0053] At this point, inject 1 liter of hydraulic oil into the oil-gas separation and injection device, close the top valve YF3 on the oil-gas separation and injection device, open the other valves, and start the circulating oil pump in the filter device. This will enable the online purification of the hydraulic oil in the circuit breaker hydraulic mechanism.

[0054] like Figure 7As shown, when the combined device is in the hydraulic oil recovery processing state, the second end of the first bottom valve YF1 on the oil-gas separation and oil injection device is connected to the second end of the second valve ZF2 of the filter device; the second end of the one-way valve of the filter device is connected to the drain valve SF2 of the circuit breaker hydraulic mechanism; and the second bottom valve YF2 on the oil-gas separation and oil injection device is closed.

[0055] At this point, start the circulating oil pump in the filter device to recover the hydraulic oil inside the hydraulic mechanism.

[0056] like Figure 8 As shown, when the combined device is in the hydraulic oil purification treatment state, the second end of the second bottom valve YF2 on the oil-gas separation and oil injection device is connected to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism, and the second end of the first bottom valve YF1 is connected to the second end of the one-way valve of the filter device; and the top valve YF3 on the oil-gas separation and oil injection device is closed.

[0057] At this point, the circulating oil pump in the filtration device is started to purify the hydraulic oil.

[0058] Understandably, hydraulic oil recovery is suitable for situations where the amount of hydraulic oil inside the hydraulic mechanism is relatively small, such as less than 4 liters. In such cases, online purification is not suitable; therefore, the hydraulic oil inside the hydraulic mechanism needs to be drained and then purified externally.

[0059] like Figure 9 As shown, when the combined device is in the vacuuming and oil injection process, the second end of the second bottom valve YF2 on the first oil-gas separation and oil injection device YQ1 is connected to the oil discharge valve SF2 of the circuit breaker hydraulic mechanism, and its first bottom valve YF1 and top valve YF3 are closed.

[0060] The second end of the first bottom valve YF1 on the second oil-gas separation and oil injection device YQ2 is connected to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism; its top valve YF3 is connected to the second end of the first valve ZF1 of the vacuum device.

[0061] During vacuuming, the second bottom valve YF2 on the second oil-gas separation and oil injection device is closed, and qualified hydraulic oil is injected into the first oil-gas separation and oil injection device. The vacuum pump in the vacuuming device is then started to perform vacuuming. During this process, the second oil-gas separation and oil injection device YQ2 can prevent hydraulic oil from entering the vacuum pump.

[0062] Once the pressure gauge shows that the vacuum level has reached the predetermined value (e.g., less than 500 Pa), open the second bottom valve YF2 on the second oil-gas separation and oil injection device to perform vacuum oil injection.

[0063] like Figure 10The diagram shows the main flow chart of a method for changing hydraulic oil in a circuit breaker hydraulic mechanism provided by the present invention, which adopts the method described above. Figure 1 To classify Figure 9 The method, implemented by the described combination device, includes the following steps:

[0064] Step S1: Connect the oil-gas separation and oil device, the filter device and the circuit breaker hydraulic mechanism, so that the combined device is in the state of online hydraulic oil purification or in the state of hydraulic oil recovery and purification, and purify the circuit breaker hydraulic mechanism.

[0065] Step S2: Connect the vacuuming device, oil-gas separator and oil device, filter device and circuit breaker hydraulic mechanism to put the combined device into a vacuuming and oil injection state, and perform vacuuming and oil injection on the combined device.

[0066] More specifically, in a particular example, step S1 further includes:

[0067] Step S10, according to Figure 6 Connect the second end of the second bottom valve YF2 on the oil-gas separation and oil injection device to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism, and connect the second end of the first bottom valve YF1 to the second end of the second valve ZF2 of the filter device; connect the second end of the one-way valve of the filter device to the oil discharge valve SF2 of the circuit breaker hydraulic mechanism.

[0068] Step S11: Inject 1 liter of hydraulic oil into the oil-gas separation and injection device, close the top valve YF3 on the oil-gas separation and injection device, open other valves, and start the circulating oil pump in the filter device to achieve online purification of the hydraulic oil of the circuit breaker hydraulic mechanism.

[0069] In a specific example, step S1 further includes:

[0070] Step S12, according to Figure 7 Connect the components by connecting the second end of the first bottom valve YF1 on the oil-gas separation and oil injection device to the second end of the second valve ZF2 on the filter device; connect the second end of the one-way valve on the filter device to the oil drain valve SF2 of the circuit breaker hydraulic mechanism.

[0071] Step S13: Close the second bottom valve YF2 on the oil-gas separation and oil injection device, open other valves, start the circulating oil pump in the filter device to recover the hydraulic oil inside the hydraulic mechanism; and after the recovery is completed, disconnect the circuit breaker hydraulic mechanism from the oil-gas separation and oil injection device and the filter device.

[0072] Step S14, according to Figure 8Make the connection by connecting the second end of the first bottom valve YF1 on the oil-gas separation and oil injection device to the second end of the one-way valve of the filter device.

[0073] Step S15: Close the top valve YF3 on the oil-gas separation and oil injection device, open other valves, and start the circulating oil pump in the filter device to achieve the purification treatment of hydraulic oil.

[0074] In a specific example, step S2 further includes:

[0075] Step S20, according to Figure 9 The connection is made in the following manner: the second end of the second bottom valve YF2 on the first oil-gas separation and oil injection device is connected to the oil discharge valve SF2 of the circuit breaker hydraulic mechanism; the second end of the first bottom valve YF1 on the second oil-gas separation and oil injection device is connected to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism; and its top valve YF3 is connected to the second end of the first valve ZF1 of the vacuum device.

[0076] Step S21: Inject qualified hydraulic oil into the first oil-gas separation and injection device, close the second bottom threshold valve YF2 of the second oil-gas separation and injection device, close the first bottom valve YF1 and top valve YF3 of the first oil-gas separation and injection device, open other valves, start the vacuum pump in the vacuuming device, and perform vacuuming.

[0077] Step S22: After the pressure gauge displays the predetermined value, open the second bottom valve YF2 on the second oil-gas separation and oil injection device to perform vacuum oil injection. After the oil level reaches the required position, the vacuum oil injection work is completed.

[0078] The following points should be noted during this process:

[0079] When connecting to vacuum oil injection, pay attention to the two oil-gas separators and the liquid level of the oil injection device to prevent hydraulic oil from entering the vacuum pump and damaging the equipment;

[0080] Pay attention to the condition of the filter cartridges and replace contaminated cartridges promptly.

[0081] When adding oil, pay attention to the liquid level of the second oil-gas separator and the oil injection device to prevent insufficient new oil from causing air to enter the equipment, damaging the vacuum and affecting the maintenance effect.

[0082] Implementing the embodiments of the present invention has the following beneficial effects:

[0083] This invention provides a combined device and method for changing hydraulic oil in the hydraulic mechanism of a circuit breaker. By setting up a vacuum device, an oil-gas separator, an oil device, and a filter device, and by utilizing the connection and cooperation between these devices and the hydraulic mechanism of the circuit breaker, online purification, hydraulic oil recovery, hydraulic oil purification, or vacuum oil injection can be achieved. Implementing this invention can improve the efficiency of changing hydraulic oil, reduce the amount of hydraulic oil used, and save costs.

[0084] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A combined device for changing hydraulic oil in the hydraulic mechanism of a circuit breaker, characterized in that, include: A vacuum pumping device includes a vacuum pump, a first end of a first valve ZF1 connected to the vacuum pump, and a pressure gauge connected to the second end of the first valve ZF1. At least one oil-gas separation and oil injection device, each oil-gas separation and oil injection device includes a pressure vessel, on which a first bottom valve YF1, a second bottom valve YF2 and a top valve YF3 are provided. The first ends of the first bottom valve YF1 and the second bottom valve YF2 are both extended to the bottom of the pressure vessel through a pipe, and the first end of the top valve YF3 is extended to the top of the pressure vessel through a pipe. A filtration device comprising two series-connected compression filters, with a second valve ZF2 first end connected to one end of the series-connected compression filters, a circulating oil pump connected in sequence to the other end of the series-connected compression filters, and a one-way valve first end connected to the other end of the circulating oil pump. At least one oil replenishment valve SF1 and an oil discharge valve SF2 are provided on the hydraulic mechanism of the circuit breaker; The vacuuming device, oil-gas separation and oil injection device, filtration device and circuit breaker hydraulic mechanism are connected and cooperate with each other so that the combined device is in the processing state of online hydraulic oil purification, hydraulic oil recovery, hydraulic oil purification or vacuuming and oil injection. When the combined device is in the online hydraulic oil purification state, the second end of the second bottom valve YF2 on the oil-gas separation and oil injection device is connected to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism, and the second end of the first bottom valve YF1 is connected to the second end of the second valve ZF2 of the filter device; the second end of the one-way valve of the filter device is connected to the oil discharge valve SF2 of the circuit breaker hydraulic mechanism; and the top valve YF3 on the oil-gas separation and oil injection device is closed. When the combined device is in the hydraulic oil recovery processing state, the second end of the first bottom valve YF1 on the oil-gas separation and oil injection device is connected to the second end of the second valve ZF2 of the filter device; the second end of the one-way valve of the filter device is connected to the drain valve SF2 of the circuit breaker hydraulic mechanism; and the second bottom valve YF2 on the oil-gas separation and oil injection device is closed. When the combined device is in the hydraulic oil purification treatment state, the second end of the second bottom valve YF2 on the oil-gas separation and oil injection device is connected to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism, and the second end of the first bottom valve YF1 is connected to the second end of the one-way valve of the filter device; and the top valve YF3 on the oil-gas separation and oil injection device is closed. When the combined device is in the vacuuming and oil injection process, the second end of the second bottom valve YF2 on the first oil-gas separation and oil injection device is connected to the oil discharge valve SF2 of the circuit breaker hydraulic mechanism, and its first bottom valve YF1 and top valve YF3 are closed. The second end of the first bottom valve YF1 on the second oil-gas separation and oil injection device is connected to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism; its top valve YF3 is connected to the second end of the first valve ZF1 of the vacuum device. During vacuuming, the second bottom valve YF2 on the second oil-gas separation and oil injection device is closed; during oil injection, the second bottom valve YF2 on the second oil-gas separation and oil injection device is opened for vacuum oil injection.

2. A method for changing hydraulic oil in the hydraulic mechanism of a circuit breaker, characterized in that, The method, implemented using the combined apparatus as described in claim 1, comprises the following steps: Step S1: Connect the oil-gas separation and oil injection device, the filter device and the circuit breaker hydraulic mechanism, so that the combined device is in the state of online hydraulic oil purification or in the state of hydraulic oil recovery and purification, and purify the hydraulic oil of the circuit breaker hydraulic mechanism. Step S2: Connect the vacuuming device, oil-gas separation and oil injection device, filter device and circuit breaker hydraulic mechanism to put the combined device into a vacuuming and oil injection state, and perform vacuuming and oil injection on the combined device.

3. The method as described in claim 2, characterized in that, Step S1 further includes: Step S10: Connect the second end of the second bottom valve YF2 on the oil-gas separation and oil injection device to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism; connect the second end of the first bottom valve YF1 to the second end of the second valve ZF2 of the filter device; connect the second end of the one-way valve of the filter device to the oil discharge valve SF2 of the circuit breaker hydraulic mechanism. Step S11: Inject 1 liter of hydraulic oil into the oil-gas separation and injection device, close the top valve YF3 on the oil-gas separation and injection device, open the replenishing valve SF1, the second bottom valve YF2, the first bottom valve YF1, the second valve ZF2 and the drain valve SF2, and start the circulating oil pump in the filter device to achieve online purification of the hydraulic oil of the circuit breaker hydraulic mechanism.

4. The method of claim 3, wherein, Step S1 further includes: Step S12: Connect the second end of the first bottom valve YF1 on the oil-gas separation and oil injection device to the second end of the second valve ZF2 of the filter device; connect the second end of the one-way valve of the filter device to the oil discharge valve SF2 of the circuit breaker hydraulic mechanism. Step S13: Close the second bottom valve YF2 on the oil-gas separation and oil injection device, open the first bottom valve YF1, the second valve ZF2 and the drain valve SF2, start the circulating oil pump in the filter device to recover the hydraulic oil inside the hydraulic mechanism; and after the recovery is completed, disconnect the circuit breaker hydraulic mechanism from the oil-gas separation and oil injection device and the filter device. Step S14: Connect the second end of the first bottom valve YF1 on the oil-gas separation and oil injection device to the second end of the one-way valve of the filter device; Step S15: Close the top valve YF3 on the oil-gas separation and oil injection device, open the second bottom valve YF2, the first bottom valve YF1 and the second valve ZF2, and start the circulating oil pump in the filter device to achieve the purification treatment of hydraulic oil.

5. The method according to any one of claims 2 to 4, wherein, Step S2 further includes: Step S20: Connect the second end of the second bottom valve YF2 on the first oil-gas separation and oil injection device to the oil discharge valve SF2 of the circuit breaker hydraulic mechanism; connect the second end of the first bottom valve YF1 on the second oil-gas separation and oil injection device to the oil replenishment valve SF1 of the circuit breaker hydraulic mechanism; connect its top valve YF3 to the second end of the first valve ZF1 of the vacuum device. Step S21: Inject qualified hydraulic oil into the first oil-gas separation and injection device, close the second bottom valve YF2 of the second oil-gas separation and injection device, and close the first bottom valve YF1 and top valve YF3 of the first oil-gas separation and injection device. Open the second bottom valve YF2, the drain valve SF2, the replenishment valve SF1, the first bottom valve YF1 and top valve YF3 of the second oil-gas separation and injection device, and the first valve ZF1. Start the vacuum pump in the vacuuming device to perform vacuuming. Step S22: After the pressure gauge displays the predetermined value, open the second bottom valve YF2 on the second oil-gas separation and oil injection device to perform vacuum oil injection. After the oil level reaches the required position, the vacuum oil injection work is completed.

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