Oil supply device and oil supply method

Abstract

The invention relates to the technical field of oil supply equipment, and provides an oil supply device and an oil supply method.The oil supply device comprises at least two oil tanks and a filtering assembly, the oil tanks can be connected with the filtering assembly, and the oil supply method comprises the steps that oil is stored in all the oil tanks, and the oil tanks comprise an oil supply state and a purification state; when primary oil is stored in the oil tank, the oil tank is in an oil supply state, and the primary oil is converted into secondary oil after being used; after the second-stage oil is injected back to the oil tank, the oil tank is switched to a purification state, the second-stage oil after standing is recovered to the first-stage oil after being filtered by the filtering assembly, and the oil tank is recovered to an oil supply state; and when a certain oil tank is in the purification state, other oil tanks in the oil supply state are selected to obtain first-stage oil. Therefore, a plurality of oil tanks are alternately used to form a multi-shift working mode, so that the interval for waiting for oil filtration can be shortened, and oil can be taken while being used.

Description

Technical Field

[0001] The present invention relates to the technical field of oil supply equipment, and in particular to an oil supply device and an oil supply method. Background Art

[0002] The existing oil supply device has a filtering function, which can filter the used lubricating oil to remove impurities and ensure the purity and quality of the lubricating oil, so that the product can be better lubricated and protected during operation, reduce friction loss, and realize the recycling of lubricating oil.

[0003] Specifically, the oil supply device is equipped with an oil tank and a filter. The oil tank is used to hold the first-level oil, that is, the oil that meets the operating requirements. The first-level oil becomes the second-level oil after use. After the second-level oil is poured into the filter for filtering, it is restored to the first-level oil and is re-introduced into the oil tank for use.

[0004] However, during use, it was found that when the oil was being filtered, the oil supply device was in standby mode, and it was necessary to wait until the oil was completely filtered before oil supply could be carried out. This resulted in a relatively long interval between the two oil supply operations, slowing down the pace of the operation.

[0005] Therefore, there is an urgent need for an oil supply device and an oil supply method to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide an oil supply device and an oil supply method, which can shorten the interval of waiting for oil filtration and realize the oil supply as soon as it is used.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] The oil supply device includes a first-level oil and a second-level oil. The purity of the first-level oil is higher than that of the second-level oil. The oil supply device includes:

[0009] Oil tanks, at least two of which are provided. If the first-level oil is contained in the oil tank, the oil tank is in an oil supply state, and if the second-level oil is contained in the oil tank, the oil tank is in a purification state. The oil tank in the oil supply state is used for oil supply;

[0010] The filter assembly, the above-mentioned oil tanks are all connected to the above-mentioned filter assembly, and the above-mentioned oil tanks in the above-mentioned purification state can circulate oil through the above-mentioned filter assembly, so that the above-mentioned secondary oil is converted into the above-mentioned primary oil after being filtered by the above-mentioned filter assembly.

[0011] As a preferred technical solution of the oil supply device, a magnetic attraction component is installed in the oil tank, and the magnetic attraction component is laid on the bottom of the oil tank to accelerate the precipitation of metal impurities in the secondary oil.

[0012] As a preferred technical solution of the above-mentioned oil supply device, a detachable first filter assembly is also installed in the above-mentioned oil tank. The above-mentioned first filter assembly is located at the bottom of the above-mentioned oil tank and covers the top of the above-mentioned magnetic attraction component.

[0013] As a preferred technical solution of the above-mentioned oil supply device, the above-mentioned first filter assembly includes a support member and filter paper, the above-mentioned support member is used to clamp the above-mentioned filter paper, and the above-mentioned filter paper covers the top of the above-mentioned magnetic attraction member.

[0014] As a preferred technical solution of the oil supply device, an oil filling port is provided on the top of the oil tank, and the oil is injected into the oil tank from the oil filling port, and a second filter is provided at the oil filling port.

[0015] As a preferred technical solution of the above-mentioned oil supply device, the above-mentioned filter assembly includes a coarse filter and a fine filter. The secondary oil in the above-mentioned oil tank is filtered by the above-mentioned coarse filter and then passed into the above-mentioned fine filter for filtration.

[0016] As a preferred technical solution of the above-mentioned oil supply device, it also includes an oil mark, which is installed on the side wall of the above-mentioned oil tank and is used to observe the remaining oil in the above-mentioned oil tank.

[0017] A fuel supply method is also provided, using the above-mentioned fuel supply device, and the above-mentioned fuel supply method comprises:

[0018] Among the above-mentioned oil tanks, the above-mentioned oil tank in the above-mentioned oil supply state is selected to output the above-mentioned first-level oil to realize oil supply;

[0019] The first-level oil is converted into the second-level oil after use, and after the second-level oil is injected back into the oil tank, the oil tank is switched to the purification state;

[0020] After standing still, the secondary oil is filtered by the filter assembly and converted into the primary oil, and the oil tank resumes the oil supply state.

[0021] As a preferred technical solution of the above oil supply method, the above secondary oil is injected back into the original above oil tank, and the number of times n of each above oil tank switching from the above purification state to the above oil supply state is obtained respectively. If n≥n 阈 , the above-mentioned oil tank switches to the standby state until the above-mentioned oil is replaced with new oil, the number n is reset to zero, and the above-mentioned oil tank switches to the above-mentioned oil supply state.

[0022] As a preferred technical solution of the above oil supply method, compare the n values ​​of each of the above oil tanks. If they meet the requirements, n max -n min =△n≥△n 阈 ,△n 阈 is the threshold of the frequency difference between the above fuel tanks, then the preferred value of n is n minThe above-mentioned oil tank obtains the above-mentioned first-level oil.

[0023] Beneficial effects of the present invention:

[0024] The present invention provides an oil supply device and an oil supply method. The oil supply device includes an oil tank and a filter assembly. The oil tank is provided with at least two oil tanks, and all the oil tanks can be connected to the filter assembly respectively. The oil supply method includes: oil is stored in the oil tank, and the oil tank includes an oil supply state and a purification state. When the first-level oil is stored in the oil tank, it is in the oil supply state, and the first-level oil is converted into a second-level oil after use; after the second-level oil is injected back into the oil tank, the oil tank is switched to the purification state, and the second-level oil after standing is filtered by the filter assembly to restore to the first-level oil, and the oil tank restores the oil supply state; when a certain oil tank is in the purification state, other oil tanks in the oil supply state are selected to obtain the first-level oil. In this way, multiple oil tanks are used alternately to form a multi-shift working mode, which can shorten the interval of waiting for oil filtering and realize the use of oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0026] Figure 1 The structure of the fuel tank provided by the embodiment of the present invention is schematically shown in FIG. Figure 1 ;

[0027] Figure 2 The structure of the fuel tank provided by the embodiment of the present invention is schematically shown in FIG. Figure 2 ;

[0028] Figure 3 is a cross-sectional view of a fuel tank provided by an embodiment of the present invention;

[0029] Figure 4 It is a structural schematic diagram of an oil filtering device provided in an embodiment of the present invention.

[0030] In the figure:

[0031] 100, fuel tank; 101, fuel tank A; 102, fuel tank B; 103, fuel tank C; 110, magnetic element; 120, first filter assembly; 130, oil filling port; 140, second filter; 150, oil drain port; 160, oil mark; 170, oil extraction port; 181, first oil inlet; 182, second oil inlet; 191, first oil outlet; 192, second oil outlet;

[0032] 210, coarse filter; 211, coarse filter oil outlet; 212, coarse filter oil inlet; 220, fine filter; 221, fine filter oil outlet; 222, fine filter oil inlet. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] like Figures 1 to 4As shown, the present invention provides an oil supply device, wherein the oil is divided into primary oil and secondary oil, the purity of the primary oil is higher than that of the secondary oil, and the oil supply device comprises an oil tank 100 and a filter assembly. Among them, at least two oil tanks 100 are provided, and if the primary oil is contained in the oil tank 100, it is in an oil supply state, and if the secondary oil is contained in the oil tank 100, it is in a purification state, and the oil tank 100 in the oil supply state is used for oil supply; the oil tanks 100 are all connected to the filter assembly, and the oil tank 100 in the purification state can circulate the oil through the filter assembly, so that the secondary oil is filtered by the filter assembly and converted into the primary oil.

[0038] A fuel supply method is also provided, which uses the above-mentioned fuel supply device, and the fuel supply method includes: among each fuel tank 100, selecting the fuel tank 100 that is in the fuel supply state to output the first-level oil to realize fuel supply; the first-level oil is converted into the second-level oil after use, and after the second-level oil is injected back into the fuel tank 100, the fuel tank 100 is switched to the purification state; the second-level oil after standing is filtered by the filter component and converted into the first-level oil, and the fuel tank 100 resumes the fuel supply state. Exemplarily, the oil supply device includes two oil tanks 100, which are respectively denoted as oil tank A101 and oil tank B102. In the initial stage, both oil tanks 100 store primary oil, that is, both oil tanks 100 are in the oil supply state. When in use, the primary oil in oil tank A101 is first selected, and oil tank B102 is idle. The used primary oil is contaminated and converted into secondary oil, and the secondary oil is injected back into oil tank A101. At this time, oil tank A101 switches from the oil supply state to the purification state. At this time, the primary oil is provided by oil tank B102 which is in the oil supply state. Specifically, the secondary oil is left in the oil tank A101 for a period of time, and some impurities in the secondary oil are precipitated. The secondary oil is stratified in the direction of gravity, that is, the clearer oil in the upper layer and the metal precipitates in the lower layer. The clearer oil in the upper layer is passed through the filter assembly for filtration treatment and restored to the primary oil. At this time, the oil tank A101 is restored from the purification state to the oil supply state, and the oil tank B102 is switched to the purification state after the secondary oil is injected. In this way, the oil tank A101 and the oil tank B102 are used alternately to form a double-shift working mode, which can shorten the interval of waiting for oil filtration. If it is satisfied, the time T for the primary oil to be converted into the secondary oil 1 ≥T 2 , T 2 The time it takes for the secondary oil to be purified into the primary oil can achieve uninterrupted and continuous oil supply.

[0039] Furthermore, in order to shorten the waiting time and achieve uninterrupted continuous oil supply, Figure 4As shown, the oil supply device includes three oil tanks 100, which are respectively denoted as oil tank A101, oil tank B102 and oil tank C103, and the purification state is further divided into a sedimentation state and a filtration state. In the initial stage, the three oil tanks 100 all store primary oil, that is, the three oil tanks 100 are in the oil supply state. When in use, first obtain the primary oil in oil tank A101, and the other two oil tanks 100 are idle. The used primary oil is contaminated and converted into secondary oil, and the secondary oil is injected back into oil tank A101. At this time, oil tank A101 is converted from the oil supply state to the sedimentation state, and the secondary oil is statically stratified in oil tank A101; obtain the primary oil in oil tank B102, and oil tank C103 is idle. The used primary oil is contaminated and converted into secondary oil, and the secondary oil is injected back into oil tank B102. At this time, the oil tank B102 is transformed from the oil supply state to the sedimentation state, and the oil tank A101 is transformed from the sedimentation state to the filtration state, forming a cycle with the filtering component, and the clearer oil in the upper layer of the secondary oil inside it is passed into the filtering component for filtration to form primary oil. After the filtration is completed, the oil tank A101 returns to the oil supply state. During this period, the primary oil can be obtained from the oil tank C103, and the cycle continues. By further refining the purification process and setting more oil tanks 100 to alternately participate in the oil supply cycle, waiting time can be reduced.

[0040] For example, if the oil in the same oil tank 100 is extracted multiple times, the secondary oil cannot be injected back into the original oil tank 100, otherwise the primary oil in the oil tank 100 will be contaminated. In this way, it is assumed that there are three oil tanks 100, which are respectively recorded as oil tank A101, oil tank B102 and oil tank C103, wherein oil tank A101 and oil tank B102 store primary oil, and oil tank C103 is an empty oil tank 100. Part of the primary oil is extracted from oil tank A101 or oil tank B102 for use. After the part of the primary oil is used to become secondary oil, the secondary oil is injected into oil tank C103 until the primary oil in oil tank A101 or oil tank B102 is emptied, and the oil tank 100 is empty, waiting to receive the secondary oil, and the secondary oil in oil tank C103 is precipitated and filtered to become primary oil, and oil tank C103 is switched to the oil supply state.

[0041] It should be noted that the classification standard for primary oil and secondary oil is whether the purity of the oil meets the requirements of the operation. If it does, the oil is primary oil, if not, it is secondary oil.

[0042] It should be noted that the purity of the first-level oil formed by standing and filtering the second-level oil is generally lower than that of the unused first-level oil.

[0043] It should be noted that when the number of oil tanks 100 is greater than 2, several oil tanks 100 in the oil supply state can be selected according to the usage scenario to obtain the first-level oil. 1 There are 100 N fuel tanks in the clean state. 2 , satisfying N 1 +N 2 =N, 1≤N 1 ≤N,N 2 ≥0, if N 1 =N, then at most N-1 oil tanks 100 are selected simultaneously to obtain the first-level oil.

[0044] Optionally, a magnetic member 110 is installed in the oil tank 100, and the magnetic member 110 is laid at the bottom of the oil tank 100 to accelerate the precipitation of metal impurities in the secondary oil. In this way, the magnetic member 110 can absorb metal debris mixed in the secondary oil, accelerate the precipitation speed of the metal debris, and absorb the metal debris before the oil passes into the filter assembly, which can reduce the working pressure of the filter assembly and extend its service life.

[0045] Optionally, a detachable first filter assembly 120 is also installed in the oil tank 100 . The first filter assembly 120 is located at the bottom of the oil tank 100 and covers the top of the magnetic attraction component 110 .

[0046] In this way, the metal debris attracted and precipitated by the magnetic element 110 adheres to the first filter assembly 120. The first filter assembly 120 and the oil tank 100 are detachable, which is convenient for cleaning the metal debris attached to their surfaces, thereby avoiding the need to clean the magnetic element 110 or reducing the number of times the magnetic element 110 is cleaned.

[0047] In other embodiments, the magnetic attraction member 110 can also be cleaned by a scraper.

[0048] In other embodiments, the magnetic component 110 is an electromagnet, which can control whether it has magnetism by turning on and off the current. When the sedimentation of the secondary oil needs to be accelerated, the magnetic component 110 has magnetism. When the magnetic component 110 needs to be cleaned, it loses its magnetism, making it easier for metal impurities to separate from it.

[0049] Optionally, the first filter assembly 120 includes a support member and filter paper, the support member is used to clamp the filter paper, and the filter paper covers the top of the magnetic suction member 110. In this way, by only replacing the filter paper, the cleaning process of the metal debris and the material loss can be simplified.

[0050] like Figure 3As shown, optionally, an oil filling port 130 is provided at the top of the oil tank 100, and the oil is injected into the oil tank 100 from the oil filling port 130, and a second filter 140 is provided at the oil filling port 130. In this way, the oil passes through the second filter 140 under the action of gravity, and the second filter 140 can first filter out large particles of impurities entrained in the oil, forming a double filtration with the magnetic suction member 110.

[0051] Furthermore, the oil tank 100 includes a tank body and a tank cover, the oil filling port 130 is opened on the tank cover, and the second filter 140 is installed on the tank cover.

[0052] Optionally, the filter assembly includes a coarse filter 210 and a fine filter 220. The secondary oil in the oil tank 100 is filtered by the coarse filter 210 and then filtered by the fine filter 220. The filtering accuracy of the coarse filter 210 is lower than that of the fine filter 220. Thus, the filtering burden of a single filter can be reduced through graded filtering, thereby extending its service life.

[0053] Further, such as Figure 2 and Figure 4 As shown, each oil tank 100 is provided with a first oil inlet 181, a second oil inlet 182, a first oil outlet 191, and a second oil outlet 192, a coarse filter 210 is provided with a coarse filter oil outlet 211 and a coarse filter oil inlet 212, and a fine filter 220 is provided with a fine filter oil outlet 221 and a fine filter oil inlet 222. The first oil inlets 181 of all oil tanks 100 are respectively connected to the coarse filter oil outlet 211, the first oil outlets 191 of all oil tanks 100 are respectively connected to the coarse filter oil inlet 212, the second oil inlets 182 of all oil tanks 100 are respectively connected to the fine filter oil outlet 221, and the second oil outlets 192 of all oil tanks 100 are respectively connected to the fine filter oil inlet 222.

[0054] like Figure 3 As shown, the oil tank 100 is optionally provided with an oil drain port 150, which is provided at the bottom of the oil tank 100. When the oil in the oil tank 100 needs to be emptied, the oil drain port 150 is opened, and the oil drain port 150 is provided at the bottom of the oil tank 100, which can reduce the oil residue in the oil tank 100.

[0055] Furthermore, the bottom of the oil tank 100 is arranged in an inclined surface, and in the vertical direction, the oil drain port 150 is arranged at a lower position of the inclined surface.

[0056] like Figure 1 As shown, optionally, the oil filter device further includes an oil mark 160, which is mounted on the side wall of the oil tank 100 and is used to observe the oil remaining in the oil tank 100. In this way, it is convenient for the user to obtain the oil remaining in the oil tank 100.

[0057] Optionally, the secondary oil is injected back into the crude oil tank 100, and the number of times n that each oil tank 100 switches from the purification state to the oil supply state is obtained. If n≥n 阈 , the oil tank 100 switches to the standby state until the oil is replaced, the number n is reset, and the oil tank 100 switches to the oil supply state.

[0058] It should be noted that the secondary oil passes through n 阈 The purity of the oil obtained after the first purification cannot reach the standard of first-grade oil.

[0059] It should be noted that when the oil tank 100 is in the standby state, the oil inside is no longer used or filtered.

[0060] Exemplarily, the oil tank 100 is provided with an oil extraction port 170, an oil inlet and an oil outlet, wherein the primary oil in the oil tank 100 can be obtained through the oil extraction port 170, the oil outlet is used to connect to the input end of the filter assembly, and the oil inlet is used to connect to the output end of the filter assembly. Each of the oil extraction port 170, the oil inlet and the oil outlet of the oil tank 100 is provided with a switch valve, and the switch valve used to control the opening and closing of the oil extraction port 170 is referred to as the oil extraction switch valve, and the switch valve used to control the oil inlet or the oil outlet is referred to as the filter switch valve. The filter switch valve is provided with a switch counter.

[0061] When the oil tank 100 is in the purification state and needs to use the filter assembly to purify the secondary oil, the filter switch valve is opened and closed after the filtration is completed. That is, each time the oil tank 100 switches from the purification state to the oil supply state, the switch counter counts +1. As the number of uses increases, the purity of the filtered oil gradually decreases. When the value of the switch counter reaches n 阈 When the oil is used, it is considered that the oil has been recycled enough times and cannot be restored to the first-level oil that meets the operating requirements through the filter assembly. After the used second-level oil is injected into the oil tank 100, the filter switch valve of the oil tank 100 remains closed and the oil is no longer filtered. After the oil is replaced, the switch counter counts back to zero and counts again, and the oil tank 100 participates in the oil supply again.

[0062] Optionally, compare the n values ​​of each fuel tank 100. If they meet the requirements, n max -n min =△n≥△n 阈 ,△n 阈 is the threshold of the frequency difference between the fuel tanks 100, then the preferred value of n is n min The oil tank 100 obtains the first-level oil.

[0063] As the oil is used more and more, its quality gradually decreases. After a certain number of uses, it needs to be replaced. If the number of uses of the same batch of oil varies too much, the quality difference will be obvious, and the timing of oil change will be uneven. The increase in the frequency of oil change increases the workload of the staff. Therefore, by obtaining the n value of each oil tank 100 and selecting the maximum value n max and the minimum value n min , make a difference, if △n≥△n 阈 , then the preferred value of n is n min The fuel tank 100 obtains first-grade oil, reducing the difference in usage frequency.

[0064] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. The oil supply device, wherein the oil is divided into primary oil and secondary oil, the purity of the primary oil is higher than the purity of the secondary oil, and is characterized in that: The oil supply device comprises: An oil tank (100), wherein at least two of the oil tanks (100) are provided, and the oil tank (100) is in an oil supply state if the first-level oil is contained in the oil tank (100), and is in a purification state if the second-level oil is contained in the oil tank (100), and the oil tank (100) in the oil supply state is used for oil supply; The oil tank (100) is connected to the filter assembly, and the oil tank (100) in the purification state can circulate oil through the filter assembly, so that the secondary oil is converted into the primary oil after being filtered by the filter assembly.

2. The oil supply device according to claim 1, characterized in that: A magnetic attraction component (110) is installed in the oil tank (100), and the magnetic attraction component (110) is laid on the bottom of the oil tank (100) to accelerate the precipitation of metal impurities in the secondary oil.

3. The oil supply device according to claim 2, characterized in that: A detachable first filter assembly (120) is also installed in the oil tank (100), and the first filter assembly (120) is located at the bottom of the oil tank (100) and covers the top of the magnetic attraction component (110).

4. The oil supply device according to claim 3, characterized in that: The first filter screen assembly (120) comprises a support member and filter paper, wherein the support member is used to clamp the filter paper, and the filter paper covers the top of the magnetic attraction member (110).

5. The oil supply device according to claim 1, characterized in that: The top of the oil tank (100) is provided with an oil filling port (130), and the oil is injected into the oil tank (100) from the oil filling port (130). A second filter screen (140) is provided at the oil filling port (130).

6. The oil supply device according to claim 1, characterized in that: The filtering assembly comprises a coarse filter (210) and a fine filter (220); the secondary oil in the oil tank (100) is filtered through the coarse filter (210) and then passed into the fine filter (220) for filtration.

7. The oil supply device according to any one of claims 1 to 6, characterized in that: It also includes an oil mark (160), which is installed on the side wall of the oil tank (100) and is used to observe the remaining oil in the oil tank (100).

8. A method for supplying oil, using the oil supply device according to any one of claims 1 to 7, characterized in that: The oil supply method comprises: Among the oil tanks (100), the oil tank (100) in the oil supply state is selected to output the primary oil to realize oil supply; The primary oil is converted into secondary oil after use, and after the secondary oil is injected back into the oil tank (100), the oil tank (100) is switched to the purification state; After standing still, the secondary oil is filtered by the filter assembly and converted into the primary oil, and the oil tank (100) resumes the oil supply state.

9. The oil supply method according to claim 8, characterized in that: The secondary oil is poured back into the original oil tank (100), and the number of times n that each oil tank (100) switches from the purification state to the oil supply state is obtained. If n≥n 阈 , the oil tank (100) switches to the standby state until the oil is replaced, the number n is reset to zero, and the oil tank (100) switches to the oil supply state.

10. The oil supply method according to claim 9, characterized in that: Compare the n values ​​of the oil tanks (100), if they meet the requirements, n max -n min =△n≥△n 阈 ,△n 阈 is the threshold value of the difference in the frequency of use between the fuel tanks (100), then the value of n is preferably selected as n min The oil tank (100) obtains the first-level oil.

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