Automobile oil changing device with gas and oil path structure

Abstract

The invention relates to the technical field of new energy maintenance, in particular to an automobile oil changing device with an air and oil way structure, which comprises a device main body, a first oil barrel and a second oil barrel are arranged on the side surface of the device main body, and the air and oil way structure comprises an oil changing head, an ejector pin, an air pump and a three-way valve; the second end of the oil change head is connected with the first oil barrel through a recovery pipe; the three-way valve is provided with an outlet, a first inlet and a second inlet, and the ejector pin is telescopically arranged at the first end of the oil changing head and connected with the outlet of the three-way valve. The exhaust end of the air pump is connected with the first inlet of the three-way valve and the top of the second oil drum. The bottom of the second oil drum is connected with the second inlet of the three-way valve. The air flow direction is controlled through the three-way valve, residual waste engine oil in the engine is rapidly discharged in combination with compressed air provided by the air pump, and the problems that the waste engine oil is poor in fluidity and difficult to thoroughly discharge in a gravity discharge mode are solved.

Description

Technical Field

[0001] The invention relates to the technical field of new energy maintenance and repair, and in particular to an automobile oil changing device with an air-oil circuit structure. Background Art

[0002] As a new energy vehicle, hybrid electric vehicles combine the advantages of traditional internal combustion engines and electric motors to provide higher fuel efficiency and lower emission levels. However, despite their design to reduce environmental impact and improve energy efficiency, hybrid electric vehicles still rely on traditional internal combustion engine systems to provide part of the power output. Therefore, for such vehicles, regular maintenance of the engine and its related components is crucial.

[0003] Regular oil changes and fuel tank cleaning are key steps in the maintenance of hybrid vehicles. This not only helps ensure the engine is running optimally, but also effectively extends the life of key internal parts such as the generator.

[0004] At present, the most common oil change method in auto repair shops is the gravity oil draining method. This method unscrews the drain bolt located on the engine oil pan and uses gravity to make the old oil flow into a pre-prepared waste oil collection container. Although this method is simple and direct, it has limitations. First, because waste oil often has high viscosity and consistency and poor fluidity, the speed of gravity discharge is slow and difficult to drain completely. This means that even after the so-called "oil change", a considerable amount of old oil remains in the engine. After mixing with the newly added oil, it may affect the quality of the new oil and reduce its proper lubrication and protection performance. In addition, if the impurities in the old oil are not fully removed, it may accelerate the wear of engine components and shorten the service life of the engine. In response to the above problems, the present invention proposes an automobile oil change device with an air-oil circuit structure. Summary of the invention

[0005] The object of the present invention is to provide an automobile oil changing device with an air-oil circuit structure, so as to solve the problems raised in the above-mentioned background technology.

[0006] The present invention is achieved through the following technical solutions: An automobile oil-changing device with an air-oil circuit structure comprises a device body, a first oil barrel and a second oil barrel are arranged on the side of the device body, the air-oil circuit structure comprises an oil-changing head, a ejector pin, an air pump and a three-way valve, the first end of the oil-changing head is suitable for being connected to the oil drain hole of the engine oil pan, and the second end of the oil-changing head is connected to the first oil barrel through a recovery pipe; the three-way valve has an outlet, a first inlet and a second inlet, the ejector pin is telescopically arranged at the first end of the oil-changing head, and the ejector pin is connected to the outlet of the three-way valve; the exhaust end of the air pump is connected to the first inlet of the three-way valve and the top of the second oil barrel, and the bottom of the second oil barrel is connected to the second inlet of the three-way valve.

[0007] Optionally, an expansion airbag is provided in the gap between the ejector pin and the oil change head, an annular wall groove is provided on the inner wall of the oil change head, the expansion airbag is an annular sheet structure, the upper and lower ends of the expansion airbag are fixed to the annular wall groove by glue, an air injection space is formed between the expansion airbag and the annular wall groove, the air injection space is connected to the exhaust end of the air pump, and a two-way valve is provided between the expansion airbag and the exhaust end of the air pump.

[0008] Optionally, a quick connector is passed through and fixed on the side wall of the oil change head, the ejector pin is connected to the quick connector via a spiral hose, and the quick connector is connected to the outlet of the three-way valve.

[0009] Optionally, a round iron piece is fixedly provided at one end of the ejector pin close to the spiral hose, a magnetic block is provided on the outer sliding sleeve of the oil change head, and the magnetic block and the oil change head are connected by snap connection, threaded connection or pin fixation.

[0010] Optionally, the iron piece is an annular plate structure, the inner hole of the iron piece is fixed outside the ejector pin, and a plurality of filter holes are provided through the iron piece near the ejector pin, and the plurality of filter holes are equidistantly distributed around the circumference of the iron piece.

[0011] Optionally, the iron piece and the ejector pin are rotatably connected around the axis of the ejector pin, the filter hole is a strip hole arranged along the radial direction of the iron piece, the opening width of the upper end of the strip hole is greater than the opening width of the lower end, the hole wall of the strip hole on one side perpendicular to the rotation direction of the iron piece is set to an inclined surface, and an iron filings collection groove is provided on the iron piece on the side of the strip hole away from the ejector pin.

[0012] Optionally, a plurality of connecting balls are embedded in the inner hole of the iron piece along its circumference, and the plurality of connecting balls can rotate freely in any direction on the iron piece. The outer wall of the ejector pin is provided with a plurality of limiting ball grooves adapted to the connecting balls along the circumference, and the cross-section of the limiting ball groove is semicircular.

[0013] Optionally, one end of the oil change head connected to the oil drain hole of the engine oil pan is rotatably connected to a rotary joint, and the exterior of the rotary joint is provided with an external thread, which is adapted to the internal thread of the oil drain hole.

[0014] Optionally, an oil receiving pan is provided on the top of the device body, a driving device for lifting the oil receiving pan is provided inside the device body, an oil drain hole is provided at the bottom of the oil receiving pan, the oil drain hole is connected to the first oil barrel through an oil drain pipe, the recovery pipe is a hose, a hook is provided on the side of the oil change head, a hanging plate is fixedly provided on the side of the oil receiving pan, and a hanging hole for inserting the hook is provided on the hanging plate.

[0015] Optionally, a one-way plate capable of covering the oil drain hole is rotatably connected to the inner side of the oil drain hole of the engine oil pan, and the rotationally connected position of the one-way plate and the engine oil pan is elastically connected via a torsion spring.

[0016] Compared with the prior art, the present invention provides an automobile oil changing device with an air-oil circuit structure, which has the following beneficial effects: The present invention controls the airflow direction through a three-way valve and combines the compressed air provided by the air pump to quickly discharge the waste oil remaining in the engine, while ensuring that new oil can be efficiently filled into the engine, thereby improving the overall efficiency and quality of oil change and avoiding the problem of poor fluidity and difficulty in complete discharge of waste oil in a gravity discharge mode. After the waste oil is discharged, the present invention only needs to adjust the two-way valve to an open state, start the air pump to supply air to the expansion airbag, so that the airbag expands and tightly seals the gap between the ejector pin and the oil change head, so that new oil can be directly injected into the engine through the oil discharge hole of the engine oil pan; The filter hole of the present invention can play a role in preliminary filtering of waste oil, and because the waste oil contains a large amount of iron filings, these iron filings will gather toward the edge of the iron piece away from the filter hole under the magnetic force of the magnet, which can reduce the probability of clogging of the filter hole; When the waste oil in the present invention enters the interior of the oil change head, the waste oil will pass through the bar-shaped hole. At this time, the waste oil will impact the inclined surface of the bar-shaped hole, thereby pushing the iron piece to rotate. The iron filings in the waste oil can pass through the upper opening of the bar-shaped hole to enter the interior of the bar-shaped hole, but the iron filings cannot pass through the lower opening of the bar-shaped hole. In this way, the iron piece plays a role in filtering the waste oil. In addition, since the flowing waste oil will push the iron piece to rotate, centrifugal force is generated when the iron piece rotates, and the iron filings intercepted in the bar-shaped hole are therefore affected by the centrifugal force. Under the action of the centrifugal force, the iron filings are pushed into the iron filing collection groove at the outer periphery of the iron piece. At the same time, since the outer sleeve of the oil change head is provided with a magnetic block, under the dual force of the magnetic block and the centrifugal force, the iron filings in the bar-shaped hole enter the iron filing collection groove, which can achieve the effect of automatically cleaning the iron filings in the bar-shaped hole and reduce the probability of clogging of the bar-shaped hole. The iron piece of the present invention achieves the purpose of rotationally connecting with the ejector pin around the axis of the ejector pin through the rolling cooperation of the connecting ball and the limiting ball groove. Specifically, the connecting ball rolls in the limiting ball groove, which can reduce the resistance during relative rotation between the iron piece and the ejector pin, ensuring that the iron piece can rotate smoothly under the push of the waste oil. The limiting ball groove provides guiding support for the rolling of the connecting ball, so that the connecting ball can accurately rotate around the axis of the ejector pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the connection structure between the gas-oil circuit structure of the present invention and the first oil barrel and the second oil barrel; Figure 3 It is a schematic diagram of the cutaway structure of the oil change head of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of a local enlarged structure; Figure 5 It is a schematic diagram of the connection structure between the oil change head and the engine oil pan of the present invention; Figure 6 It is a schematic diagram of the connection structure between the oil receiving pan and the driving device of the present invention; Figure 7 For the present invention Figure 2 Schematic diagram of the local structure; Figure 8 It is a schematic diagram of the structure of the iron piece and the ejector pin of the present invention; Fig. 9 For the present invention Figure 7 A schematic diagram of the cross-sectional structure of; Fig.10 It is a schematic diagram of the cross-sectional structure of the iron piece of the present invention.

[0018] In the figure: 1, device body; 2, first oil drum; 3, second oil drum; 4, oil change head; 5, ejector pin; 6, air pump; 7, three-way valve; 8, recovery pipe; 9, engine oil pan; 10, oil drain hole; 11, one-way plate; 12, expansion airbag; 13, two-way valve; 14, quick connector; 15, spiral hose; 16, iron parts; 17, magnetic block; 18, filter hole; 19, rotary joint; 20, drive device; 21, release Oil hole; 22. Hook; 23. Hooking plate; 24. Oil collecting pan; 25. Oil drain pipe; 26. Movable caster; 27. Handle; 28. First pipeline; 29. ​​Second pipeline; 30. Third pipeline; 31. Fourth pipeline; 32. Fifth pipeline; 33. First tee; 34. Second tee; 35. Sixth pipeline; 36. Annular wall groove; 37. Inclined surface; 38. Iron chip collecting groove; 39. Connecting ball; 40. Limiting ball groove. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example: See Figures 1 to 10 According to an embodiment of the present invention, an automobile oil changing device with an air-oil circuit structure is provided, comprising a device body 1, a first oil barrel 2 and a second oil barrel 3 are fixedly arranged on the left side of the device body 1, a movable caster 26 is installed at the bottom of the device body 1 for convenient movement and use, a handle 27 is fixedly arranged on the right side of the device body 1, and the air-oil circuit structure comprises an oil changing head 4, a ejector pin 5, an air pump 6 and a three-way valve 7, a first end of the oil changing head 4 is suitable for connecting with the oil drain hole 10 of the engine oil pan 9, and a second end of the oil changing head 4 is connected with the first oil barrel 2 through a recovery pipe 8; the three-way valve 7 has an outlet, a first inlet and a second inlet; the ejector pin 5 is retractably arranged at the first end of the oil changing head 4, and the ejector pin 5 is connected with the outlet of the three-way valve 7; the exhaust end of the air pump 6 is connected with the first inlet of the three-way valve 7 and the top of the second oil barrel 3; the bottom of the second oil barrel 3 is connected with the second inlet of the three-way valve 7. Specifically, the first inlet of the three-way valve 7 is connected to the top of the second oil barrel 3 through the first pipeline 28, a first three-way valve 33 is provided on the first pipeline 28, the exhaust end of the air pump 6 is connected to the first three-way valve 33 through the second pipeline 29, and the bottom of the second oil barrel 3 is connected to the second inlet of the three-way valve 7 through the third pipeline 30.

[0021] When draining the oil using the automobile oil-changing device with the air-oil circuit structure as described above, first, remove the drain bolt on the engine oil pan 9 to allow most of the waste oil to flow out naturally under the action of gravity. Despite this, some waste oil will still remain inside the engine and is difficult to completely remove. Next, connect the oil change head 4 to the position of the oil drain hole 10, and insert the ejector pin 5 into the oil pan. Subsequently, adjust the three-way valve 7 so that the outlet is connected to the first inlet, and start the air pump 6. At this time, the air pump 6 will deliver compressed air to the interior of the engine to form a positive pressure environment, forcing the remaining waste oil to be quickly discharged through the oil drain hole 10, and flow into the first oil barrel 2 through the gap between the ejector pin 5 and the oil change head 4 for collection.

[0022] After the waste oil is discharged, add an appropriate amount of new oil to the second oil barrel 3, remove the oil change head 4 and the ejector pin 5, and reinstall the oil drain bolt. Then, insert the ejector pin 5 into the oil filling port of the engine, adjust the three-way valve 7 so that its outlet is connected to the second inlet, and use the air pump 6 to supply air to the second oil barrel 3 again to push the new oil into the engine, thereby completing the entire oil change process. This method not only improves the discharge efficiency of waste oil, but also ensures that the new oil can be efficiently filled into the engine, improving the overall efficiency and quality of oil change.

[0023] In some embodiments, an integrated intelligent control system is also included, which includes sensors, a controller and a user interface. By installing sensors (such as pressure sensors, flow sensors, etc.) on the air pump 6, the three-way valve 7 and each pipeline, the parameters of the entire oil change process are monitored in real time, and these data are transmitted to the controller for analysis. The controller can automatically adjust the working state of the air pump 6 and the position of the three-way valve 7 according to the set parameters to ensure that the waste oil is completely discharged and the new oil is correctly filled. The user interface allows the operator to intuitively understand the current working status and perform necessary manual intervention.

[0024] In addition, in order to more thoroughly remove the old oil and other impurities remaining inside the engine, a pre-cleaning mechanism can be set at the exhaust end of the air pump 6. The pre-cleaning mechanism can include a filter and a cleaning agent storage tank. After the oil discharge stage is completed, the cleaning agent is first injected into the engine using the air pump 6 to flush the inside of the engine, and then the engine is blown dry with compressed air, and finally new oil is injected. This can not only improve the quality of oil change, but also extend the service life of the engine.

[0025] In order to avoid excessive internal pressure of the engine, in some embodiments, a safety valve is installed at the exhaust end of the air pump 6. When the detected pressure exceeds the set safety upper limit (such as bar), the valve will automatically open to release excess pressure to prevent damage to the engine.

[0026] In order to achieve more efficient oil change, in some embodiments, an expansion airbag 12 is provided at the gap between the ejector pin 5 and the oil change head 4, an annular wall groove 36 is provided on the inner wall of the oil change head 4, the expansion airbag 12 is an annular sheet structure, the upper and lower ends of the expansion airbag 12 are fixedly bonded to the annular wall groove 36 by glue, and an air injection space is formed between the expansion airbag 12 and the annular wall groove 36, the air injection space is connected to the exhaust end of the air pump 6, and a two-way valve 13 is provided between the expansion airbag 12 and the exhaust end of the air pump 6. Specifically, a second three-way valve 34 is provided on the first pipeline 28, one end of the two-way valve 13 is connected to the expansion airbag 12 through the fourth pipeline 31, and the other end is connected to the second three-way valve 34 through the fifth pipeline 32. When it is necessary to press the new engine oil in the second oil barrel 3 into the engine, it is no longer necessary to disassemble the oil change head 4 and remove it from the oil drain hole 10 of the engine. The specific operation is as follows: after the waste oil is discharged, it is only necessary to adjust the two-way valve 13 to open it, start the air pump 6 to supply air to the expansion airbag 12, so that the airbag expands and tightly seals the gap between the ejector pin 5 and the oil change head 4. In this way, new oil can be directly injected into the engine through the oil discharge hole 10 of the engine oil pan 9.

[0027] It is worth noting that the engine oil filling port must be kept open during the process of filling the engine oil through the oil drain hole 10. This can balance the pressure inside the engine, thereby ensuring that the new oil in the second oil barrel 3 can flow smoothly into the engine, avoiding the problem of new oil not being able to be smoothly injected due to pressure imbalance.

[0028] The above arrangement not only simplifies the oil changing steps and reduces the time consumption of disassembling and reinstalling the oil changing head 4, but also improves the efficiency and convenience of the entire oil changing process.

[0029] In some embodiments, a quick connector 14 is passed through and fixed on the side wall of the oil change head 4, the ejector pin 5 is connected to the quick connector 14 via a spiral hose 15, and the quick connector 14 is connected to the outlet of the three-way valve 7 via a sixth pipeline 35. The ejector pin 5 is connected to the quick connector 14 using the spiral hose 15, so that the ejector pin 5 can be extended and retracted at the first end of the oil change head 4.

[0030] In some embodiments, a circular iron piece 16 is fixedly provided at one end of the ejector pin 5 close to the spiral hose 15, and a magnetic block 17 is provided on the external sliding sleeve of the oil change head 4. The magnetic block 17 and the oil change head 4 are connected by a snap connection, a threaded connection, or a pin fixation. Through the magnetic attraction between the internal iron piece 16 and the external magnetic block 17, the operator can achieve precise movement control of the ejector pin 5 inside the oil change head 4 by simply manipulating the external magnetic block 17 of the oil change head 4 without directly contacting the ejector pin 5. When the position of the ejector pin 5 needs to be adjusted, it is only necessary to slide the magnetic block 17 along the outer wall of the oil change head 4 to drive the internal ejector pin 5 to perform a corresponding telescopic action, thereby ensuring that the ejector pin 5 can be accurately inserted into or withdrawn from the oil drain hole 10 of the engine oil pan 9.

[0031] In some embodiments, the iron piece 16 is an annular plate-shaped structure, the inner hole of the iron piece 16 is fixed to the outside of the ejector pin 5, and a plurality of filter holes 18 are provided through the iron piece 16 near the ejector pin 5, and the plurality of filter holes 18 are distributed equidistantly around the circumference of the iron piece 16. The diameter of these filter holes 18 can be adjusted according to actual needs, and is usually set between mm and mm, so as to effectively filter larger impurity particles without increasing fluid resistance due to being too small. Each filter hole 18 can also be designed to be conical or bell-shaped around to reduce the possibility of blockage and facilitate cleaning. Considering that waste oil often contains a large amount of iron filings and other metal debris, the iron piece 16 is made of a material with strong magnetism, such as high-performance permanent magnetic materials such as neodymium iron boron. In this way, when the waste oil passes through the filter hole 18, the iron filings therein will be attracted and gathered to the edge area of ​​the iron piece 16 under the strong magnetic force of the magnet, away from the filter hole 18. This not only effectively reduces the risk of the filter hole 18 being blocked by iron filings, but also improves the initial purification efficiency of the waste oil.

[0032] like Figure 8As shown, in some embodiments, the iron piece 16 is connected to the ejector pin 5 by rotation around the axis of the ejector pin 5, the filter hole 18 is a strip hole arranged along the radial direction of the iron piece 16, the opening width of the upper end of the strip hole is greater than the opening width of the lower end thereof, the hole wall on one side of the strip hole perpendicular to the rotation direction of the iron piece 16 is set as an inclined surface 37, and an iron filings collection groove 38 is set on the iron piece 16 on the side of the strip hole away from the ejector pin 5. After such arrangement, when the waste oil enters the interior of the oil change head 4, the waste oil will pass through the strip hole. At this time, the waste oil will impact the inclined surface 37 of the strip hole, thereby pushing the iron piece 16 to rotate, and the iron filings in the waste oil can pass through the upper end opening of the strip hole to enter the interior of the strip hole, but the iron filings cannot pass through the lower end opening of the strip hole, so that the iron piece 16 plays the role of filtering the waste oil. In addition, since the flowing waste oil will push the iron piece 16 to rotate, the iron piece 16 generates centrifugal force when rotating, and the iron chips intercepted in the strip hole are therefore subjected to the action of the centrifugal force. Under the action of the centrifugal force, the iron chips are pushed into the iron chip collecting groove 38 at the outer periphery of the iron piece 16. At the same time, since the outer sleeve of the oil change head 4 is provided with a magnetic block 17, under the dual force of the magnetic block 17 and the centrifugal force, the iron chips located in the strip hole enter the iron chip collecting groove 38, so that the effect of automatically cleaning the iron chips in the strip hole can be achieved, and the probability of the bar hole being blocked can be reduced. Of course, in addition to the outer sleeve of the oil change head 4, a strong magnetic material, such as a high-performance magnetic material such as neodymium iron boron, can be embedded in the iron piece 16 itself to directly enhance the adsorption capacity of the iron chips and further improve the filtering effect. In addition, in order to improve the filtering efficiency and reduce the possibility of blocking, the design of the iron piece 16 can also include a plurality of bar holes of different sizes and shapes to adapt to iron chips of different types and sizes. For example, in addition to the existing wide-upper-narrow-lower strip hole design, a strip hole with a serrated edge or a strip hole with a multi-layer stepped structure can also be used. These designs can increase the iron chip capture area and provide more paths for the waste oil to pass smoothly, thereby reducing the risk of blockage. In some embodiments, in order to prevent iron chips from accumulating in the strip hole and causing blockage, a small vibrator can also be installed near the iron piece 16 to generate small vibrations regularly to help loosen and move the iron chips, so that they are more easily thrown into the iron chip collection tank 38 by centrifugal force.

[0033] like Fig. 9 and Fig.10As shown, in order to realize the rotational connection between the iron piece 16 and the ejector pin 5 around the axis of the ejector pin 5, in some embodiments, the inner hole of the iron piece 16 is embedded with a plurality of connection balls 39 along its circumference, and the plurality of connection balls 39 can rotate freely in any direction on the iron piece 16, and the outer wall of the ejector pin 5 is provided with a plurality of limiting ball grooves 40 adapted to the connection balls 39 along the circumference, and the cross section of the limiting ball groove 40 is semicircular. The iron piece 16 realizes the purpose of the rotational connection between it and the ejector pin 5 around the axis of the ejector pin 5 through the rolling cooperation between the connection balls 39 and the limiting ball grooves 40. Specifically, the connection balls 39 roll in the limiting ball grooves 40, which can reduce the resistance when the iron piece 16 and the ejector pin 5 rotate relative to each other, ensuring that the iron piece 16 can rotate smoothly under the push of the waste oil, and the limiting ball grooves 40 provide a guide support for the rolling of the connection balls 39, so that the connection balls 39 can accurately rotate around the axis of the ejector pin 5. In addition, the design of the connecting ball 39 and the limiting ball groove 40 not only improves the flexibility and stability of the system, but also reduces wear and extends the service life. In order to reduce the friction coefficient and improve durability, chrome plating or other low friction coefficient coating treatment can be performed on the contact surface of the connecting ball 39 and the limiting ball groove 40. This treatment not only reduces wear, but also prevents rust and corrosion. In addition to using a separate connecting ball 39 and limiting ball groove 40, an integrated ball bearing structure can also be used. Multiple balls are encapsulated inside an annular bearing and directly installed between the iron piece 16 and the ejector pin 5. This method can provide higher precision and load-bearing capacity while simplifying the assembly process.

[0034] In some embodiments, one end of the oil change head 4 connected to the oil drain hole 10 of the engine oil pan 9 is rotatably connected to a rotary joint 19, and the outside of the rotary joint 19 is provided with an external thread, which is adapted to the internal thread of the oil drain hole 10. By providing the rotary joint 19, not only is the tightness of the connection between the oil change head 4 and the engine oil pan 9 ensured to prevent leakage of waste oil, but it is also convenient for the user to complete the installation or disassembly process through a simple rotation action. For example, the operator only needs to align the rotary joint 19 with the oil drain hole 10, and then rotate it clockwise to complete the connection; conversely, the connection can be easily disconnected by rotating it counterclockwise. Furthermore, the rotary joint 19 is manufactured from corrosion-resistant, high-strength alloy steel or other materials suitable for long-term exposure to the engine oil environment to extend its service life and ensure long-term stable operation.

[0035] In some embodiments, an oil receiving pan 24 is provided on the top of the device body 1, and a driving device 20 for lifting the oil receiving pan 24 is provided inside the device body 1, and the driving device 20 may be a cylinder. In order to ensure that the oil receiving pan 24 can be flexibly operated under various vehicles, the driving device 20 is not limited to a cylinder, and a more precise driving method such as an electric hydraulic pump or a servo motor can also be used to adapt to the needs of different heights and positions. When gravity oil discharge is performed, the entire oil change device is first moved under the target vehicle, and the position is adjusted so that the oil receiving pan 24 is aligned with the oil drain hole 10 of the engine oil pan 9. To this end, an adjustable positioning system can be installed on the device body 1, which includes a laser rangefinder and a level to help the operator more accurately locate the position of the oil receiving pan 24 and ensure that it is at the best receiving angle. Then, the oil receiving pan 24 is raised to a suitable height by controlling the driving device 20 to ensure that the waste oil can flow smoothly into the oil receiving pan 24. In addition, the design of the oil receiving pan 24 should take into account its capacity and shape, so that it can maximize the collection of waste oil and avoid overflow. The edge of the oil receiving pan 24 can be designed to be inclined so as to guide the waste oil to flow quickly into the central area. After the oil is drained, the drive device 20 is operated again to lower the oil receiving pan 24 to facilitate subsequent cleaning and waste oil treatment. In order to further simplify the cleaning process, the oil receiving pan 24 can be equipped with an automatic dumping mechanism. When the waste oil needs to be emptied, just press the control button and the oil receiving pan 24 will automatically tilt and pour the waste oil into a pre-prepared container. At the same time, a filter screen is installed at the bottom of the oil receiving pan 24 to initially separate larger impurities and reduce the burden in subsequent processing steps.

[0036] Furthermore, an oil drain hole 21 is provided at the bottom of the oil receiving pan 24, and the oil drain hole 21 is connected to the first oil barrel 2 through an oil drain pipe 25. The oil entering the oil receiving pan 24 can be discharged into the first oil barrel 2 through the oil drain hole 21 for collection. In order to ensure the smoothness and safety of the discharge process, the oil drain hole 21 can be equipped with an automatic control valve, which can be remotely controlled by the control system to stop or start the discharge of waste oil at any time. In addition, a transparent observation window is installed on the oil drain pipe 25 to facilitate the operator to monitor the flow of waste oil in real time and promptly discover and solve potential blockage problems.

[0037] In some embodiments, the recovery pipe 8 is a hose, a hook 22 is provided on the side of the oil change head 4, a hook plate 23 is fixedly provided on the side of the oil receiving tray 24, and a hook hole for the hook 22 to be inserted is provided on the hook plate 23. In this way, after the oil change operation is completed, the operator pulls the oil change head 4 out of the oil drain hole 10 of the engine oil pan 9 and wipes off the oil stains that may be contaminated on the outside. In order to improve the cleaning efficiency and safety, a cleaning nozzle can be provided in the design of the oil change head 4, and the oil change head 4 is immediately rinsed after the oil change is completed, so as to reduce the workload of manual wiping and ensure the cleaning effect. In addition, the material of the oil change head 4 can be selected from engineering plastics or metal materials with stronger oil resistance and smooth surface, which is not only easy to clean, but also can effectively prevent the oil from adhering. Then, align the hook 22 with the hook hole on the hook plate 23, and insert it smoothly until it is completely hung. At this time, since the first end of the oil change head 4 is in a high position, the small amount of oil remaining in the oil change head 4 will be effectively prevented from flowing out to avoid contaminating the ground or other equipment. In order to further improve the convenience and safety of use, a magnetic lock or spring clip can be provided between the hook 22 and the mounting plate 23, so that once the hook 22 contacts the mounting plate 23, it can be quickly and firmly locked, and the operation can be completed with one hand even when the operating space is limited. In addition, considering the possible dripping problem, a small detachable oil collection box can be provided under the mounting plate 23 to collect any residual oil that may drip from the oil change head 4, to prevent environmental pollution and facilitate cleaning.

[0038] like Figure 5 As shown, in some embodiments, the inner side of the drain hole 10 of the engine oil pan 9 is rotatably connected to a one-way plate 11 that can cover the drain hole 10 through a rotating shaft, and the rotation connection position of the one-way plate 11 and the engine oil pan 9 is elastically connected through a torsion spring. When the ejector pin 5 is inserted into the oil pan, the one-way plate 11 will be pushed inward by the ejector pin 5 to open the drain hole 10, so that the oil can enter the oil change head 4 from the drain hole 10. In order to enhance the sealing performance and durability of the one-way plate 11, a circle of oil-resistant rubber gaskets can be set at the edge where the one-way plate 11 contacts the drain hole 10, which can not only ensure a better sealing effect in the closed state, but also effectively reduce the wear caused by long-term use. In addition, considering that the size of the drain hole 10 of different models may be different, the one-way plate 11 can be designed to be adjustable, that is, by adjusting the position of the rotating shaft or replacing gaskets of different thicknesses to adapt to different specifications of the drain hole 10. When the oil filling is completed, the ejector pin 5 is first retracted into the oil change head 4. At this time, the one-way plate 11 will rebound under the elastic force of the torsion spring and cover the oil drain hole 10 to prevent oil leakage when the oil change head 4 is disassembled next.

[0039] Working principle: First, move the device body 1 to the bottom of the car, align the oil receiving pan 24 on the device body 1 with the oil drain port of the engine oil pan 9, then remove the drain bolt on the engine oil pan 9, and push the one-way plate 11 through the rod-shaped component in the oil drain port to allow most of the waste oil to flow out naturally under the action of gravity. The waste oil that flows out is first discharged into the oil receiving pan 24, and then discharged into the first oil barrel 2 through the oil drain hole 21 at the bottom of the oil receiving pan 24 for collection. Connect the oil change head 4 to the position of the oil drain hole 10, and insert the ejector pin 5 into the oil pan by moving the magnetic block 17. After the ejector pin 5 is inserted into the oil drain port, the one-way plate 11 is lifted up, and the three-way valve 7 is adjusted to connect the outlet with the first inlet, and the air pump 6 is started. At this time, the air The pump 6 will deliver compressed air to the inside of the engine to form a positive pressure environment, forcing the residual waste oil to be quickly discharged through the oil drain hole 10, and flow into the first oil barrel 2 through the gap between the ejector pin 5 and the oil change head 4 for collection. After the waste oil is discharged, an appropriate amount of new oil is added to the second oil barrel 3, the two-way valve 13 is adjusted to be in an open state, and the three-way valve 7 is adjusted so that its outlet is connected to the second inlet. The air pump 6 is used to supply air to the second oil barrel 3 again to push the new oil into the engine from the oil drain hole 10. At the same time, the air pump 6 also supplies air to the expansion airbag 12, so that the expansion airbag 12 expands and tightly seals the gap between the ejector pin 5 and the oil change head 4 to prevent the newly injected oil from leaking, thereby completing the entire oil change process.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automobile oil changing device with an air-oil circuit structure, comprising a device body (1), a first oil barrel (2) and a second oil barrel (3) being arranged on the side of the device body (1), characterized in that: The air-oil circuit structure comprises an oil change head (4), a ejector pin (5), an air pump (6) and a three-way valve (7); the first end of the oil change head (4) is suitable for being connected to an oil drain hole (10) of an engine oil pan (9); the second end of the oil change head (4) is connected to a first oil barrel (2) via a recovery pipe (8); the three-way valve (7) has an outlet, a first inlet and a second inlet; the ejector pin (5) is telescopically arranged at the first end of the oil change head (4); the ejector pin (5) is connected to the outlet of the three-way valve (7); the exhaust end of the air pump (6) is connected to the first inlet of the three-way valve (7) and the top of the second oil barrel (3); the bottom of the second oil barrel (3) is connected to the second inlet of the three-way valve (7).

2. The automobile oil changing device with an air-oil path structure according to claim 1, characterized in that: An expansion airbag (12) is arranged at the gap between the ejector pin (5) and the oil change head (4); an annular wall groove (36) is provided on the inner wall of the oil change head (4); the expansion airbag (12) is an annular sheet structure; upper and lower ends of the expansion airbag (12) are fixedly bonded to the annular wall groove (36) by glue; an air injection space is formed between the expansion airbag (12) and the annular wall groove (36); the air injection space is connected to the exhaust end of the air pump (6); and a two-way valve (13) is arranged between the expansion airbag (12) and the exhaust end of the air pump (6).

3. The automobile oil changing device with an air-oil circuit structure according to claim 1, characterized in that: A quick connector (14) is passed through and fixed on the side wall of the oil change head (4); the ejector pin (5) is connected to the quick connector (14) via a spiral hose (15); and the quick connector (14) is connected to the outlet of the three-way valve (7).

4. The automobile oil changing device with an air-oil path structure according to claim 3 is characterized in that: A circular iron piece (16) is fixedly provided at one end of the ejector pin (5) close to the spiral hose (15), and a magnetic block (17) is provided on the outer sliding sleeve of the oil change head (4). The magnetic block (17) and the oil change head (4) are connected by means of a snap connection, a threaded connection or a latch fixation.

5. The automobile oil changing device with an air-oil path structure according to claim 4, characterized in that: The iron piece (16) is of an annular plate-like structure, the inner hole of the iron piece (16) is fixed to the outside of the ejector pin (5), a plurality of filter holes (18) are provided through the iron piece (16) near the ejector pin (5), and the plurality of filter holes (18) are distributed at equal distances around the circumference of the iron piece (16).

6. The automobile oil changing device with an air-oil path structure according to claim 5, characterized in that: The iron piece (16) and the ejector pin (5) are rotatably connected around the axis of the ejector pin (5); the filtering hole (18) is a strip hole arranged along the radial direction of the iron piece (16); the opening width of the upper end of the strip hole is greater than the opening width of the lower end; a hole wall of the strip hole on one side perpendicular to the rotation direction of the iron piece (16) is arranged as an inclined surface (37); and an iron filings collecting groove (38) is arranged on the iron piece (16) on the side of the strip hole away from the ejector pin (5).

7. The automobile oil changing device with an air-oil path structure according to claim 6, characterized in that: The inner hole of the iron piece (16) is provided with a plurality of connecting balls (39) embedded along its circumference. The plurality of connecting balls (39) can freely rotate in any direction on the iron piece (16). The outer wall of the ejector pin (5) is provided with a plurality of limiting ball grooves (40) adapted to the connecting balls (39) along its circumference. The cross section of the limiting ball grooves (40) is semicircular.

8. The automobile oil changing device with an air-oil path structure according to any one of claims 1 to 7, characterized in that: One end of the oil change head (4) connected to the oil drain hole (10) of the engine oil pan (9) is rotatably connected to a rotary joint (19), and the exterior of the rotary joint (19) is provided with an external thread, which is adapted to the internal thread of the oil drain hole (10).

9. The automobile oil changing device with an air-oil path structure according to claim 1, characterized in that: An oil receiving pan (24) is arranged on the top of the device body (1), and a driving device (20) for lifting the oil receiving pan (24) is arranged inside the device body (1); an oil drain hole (21) is arranged at the bottom of the oil receiving pan (24), and the oil drain hole (21) is connected to the first oil barrel (2) via an oil drain pipe (25); the recovery pipe (8) is a hose, a hook (22) is arranged on the side of the oil change head (4), and a hanging plate (23) is fixedly arranged on the side of the oil receiving pan (24), and a hanging hole for inserting the hook (22) is opened on the hanging plate (23).

10. The automobile oil changing device with an air-oil path structure according to claim 1, characterized in that: A one-way plate (11) capable of covering the oil drain hole (10) is rotatably connected to the inner side of the oil drain hole (10) of the engine oil pan (9); the one-way plate (11) and the engine oil pan (9) are rotatably connected at a position where they are elastically connected via a torsion spring.

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