Oil taking and filling device

Abstract

The utility model provides an oil taking and filling device which comprises a connecting valve assembly and an oil pipe assembly matched with the connecting valve assembly, the connecting valve assembly comprises a valve body, a steel ball arranged in the valve body and an oil cap matched with the valve body, and the valve body comprises a first connecting end and a second connecting end which are oppositely arranged. The first connecting end is used for being connected with an oil discharging port of a gearbox, the second connecting end is sleeved with the oil cap in the circumferential direction, a channel is formed in the valve body, and the steel ball is used for sealing the channel. The oil pipe assembly comprises an inserting cylinder and an oil pipe detachably connected with one end of the inserting cylinder, the inserting cylinder is used for being inserted into the valve body from the second connecting end, a connecting rod is arranged at a cylinder opening in the other end of the inserting cylinder and arranged in the radial direction of the cylinder opening, and a protruding block is arranged in the middle of the side, away from the inserting cylinder, of the connecting rod and used for ejecting the steel ball to conduct the channel. The gearbox oil sampling and filling device can quickly realize the oil sampling and filling operation of gearbox oil, is convenient to operate, effectively improves the oil sampling and filling efficiency, shortens the sampling time and improves the oil sample reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile testing, in particular to an oil extraction and refueling device. Background Art

[0002] During the whole vehicle test process, it is necessary to take oil samples from the gearbox for component detection many times and supplement an equal amount of new oil. At present, the gravity method is usually adopted for the oil extraction and refueling of the gearbox. Specifically, after taking oil through the oil drain port at the bottom of the gearbox, an equal amount of new oil is added through the oil filling port at the top of the transmission. However, in the actual operation process, before taking oil and refueling the gearbox on the whole vehicle each time, it is necessary to first disassemble parts such as the air filter structure, intake pipe and bottom guard plate on the whole vehicle. The operation is complicated, the oil extraction and refueling efficiency is low, and due to the long time from when the vehicle stops to when the oil sample is taken from the gearbox, the oil and water in the obtained oil sample are not evenly mixed, and the reliability of the oil sample is low. In addition, during the wading test, since there are water flows and water droplets distributed on the lower part structure of the whole vehicle, the oil sample is easily contaminated during the process of taking oil and refueling the gearbox, which affects the oil sample detection result and cannot accurately confirm the volume of the oil sample, resulting in a large error when supplementing an equal amount of new oil. Content of the Utility Model

[0003] Based on this, the purpose of the utility model is to provide an oil extraction and refueling device, aiming to solve the technical problems in the prior art that before taking oil and refueling the gearbox on the whole vehicle each time, it is necessary to first disassemble parts such as the air filter structure, intake pipe and bottom guard plate on the whole vehicle, the operation is complicated, the oil extraction and refueling efficiency is low, the sampling time is long, and the oil and water in the obtained oil sample are not evenly mixed.

[0004] The purpose of the utility model is to provide an oil extraction and refueling device, which includes a connection valve assembly and a tubing assembly adapted to the connection valve assembly. The connection valve assembly includes a valve body, a steel ball arranged in the valve body, and an oil cap adapted to the valve body. The valve body includes a first connection end and a second connection end arranged oppositely. The first connection end is used for connecting the oil drain port of the gearbox. The oil cap is sleeved on the circumference of the second connection end. A channel is arranged in the valve body, and the steel ball is used for closing the channel;

[0005] The tubing assembly includes an insertion cylinder and a tubing detachably connected to one end of the insertion cylinder. The insertion cylinder is used for inserting into the valve body from the second connection end. A connecting rod is arranged at the mouth of the other end of the insertion cylinder. The connecting rod is arranged along the radial direction of the cylinder mouth. A convex block is arranged in the middle of the side of the connecting rod facing away from the insertion cylinder. The convex block is used for pushing open the steel ball to conduct the channel.

[0006] Compared with the prior art, the beneficial effects of the oil extraction and refueling device of the present utility model are as follows: It has a simple structure and is convenient to install. Through the cooperation of the connection valve assembly and the oil pipe assembly, the oil extraction and refueling operations of the gearbox oil can be quickly realized, and the operation is very convenient. There is no need to disassemble components such as the air filter structure, intake pipe, and bottom guard plate of the whole vehicle, which can greatly shorten the time from vehicle parking to sampling from the gearbox, effectively improve the oil extraction and refueling efficiency, enable sampling under the condition that the oil in the gearbox is in a uniform state, and thus greatly improve the reliability of the oil sample. Specifically, the connection valve assembly includes a valve body, a steel ball disposed in the valve body, and an oil cap adapted to the valve body. The first connection end of the valve body is used to connect the oil drain port of the gearbox. A channel is provided in the valve body, and the steel ball is used to block the channel to prevent oil leakage; the oil pipe assembly includes an insertion cylinder and an oil pipe. The insertion cylinder is used to insert into the valve body from the second connection end of the valve body. A connecting rod is provided at the mouth of the insertion cylinder, and a convex block is provided on the connecting rod. In actual use, the convex block is used to push open the steel ball to conduct the channel in the valve body to complete the oil extraction and refueling operations.

[0007] In addition, according to the above oil extraction and refueling device of the present utility model, the following additional technical features may also be provided:

[0008] Further, both ends of the connecting rod respectively extend beyond the outer wall of the mouth of the insertion cylinder.

[0009] Further, the oil pipe assembly further includes a first sealing ring. A first sealing groove is provided on the outer circumferential wall of the insertion cylinder, and the first sealing ring is provided in the first sealing groove. When the insertion cylinder is inserted into the valve body, the first sealing ring is located in the second connection end.

[0010] Further, a first through hole is provided in the first connection end, a second through hole is provided in the second connection end, and a steel ball installation hole is provided in the valve body between the first connection end and the second connection end. The first through hole, the steel ball installation hole, and the second through hole are sequentially connected to form the channel. The steel ball installation hole is adapted to the steel ball, and the second through hole is adapted to the insertion cylinder. When the inner wall of the steel ball installation hole is in close contact with the surface of the steel ball, the end surface of the end of the steel ball away from the opening of the first through hole is located in the second through hole, and the channel is in a closed state.

[0011] Further, the diameter of the first through hole is the same as that of the steel ball, the diameter of the second through hole is the same as the length of the rod body of the connecting rod, and the diameter of the second through hole is greater than the diameter of the first through hole.

[0012] Further, the connection valve assembly further includes a circlip and a spring. The circlip is embedded in the first through hole. One side of the circlip is connected to one end of the spring, and the other end of the spring is connected to the steel ball. When the spring is in a free state, the surface of the steel ball is in close contact with the inner wall of the steel ball mounting hole.

[0013] Further, an annular limiting block extends radially along the inner wall of the second through hole. A limiting groove is formed between the annular limiting block and the end of the steel ball mounting hole, and the limiting groove is adapted to the connecting rod.

[0014] Further, guiding grooves are respectively provided on two opposite sides of the inner wall of the annular limiting block. The guiding grooves are arranged along the axial direction of the second through hole and communicate with the limiting groove, and the guiding grooves are adapted to the connecting rod.

[0015] Further, the connection valve assembly further includes a second sealing ring. A second sealing groove is provided on the circumferential outer wall of the first connection end, and the second sealing ring is arranged in the second sealing groove;

[0016] The connection valve assembly includes a third sealing ring. A third sealing groove is provided on the circumferential outer wall of the middle part of the valve body, and the third sealing ring is arranged in the third sealing groove. When the oil cap is sleeved on the second connection end, the third sealing ring is located between the oil cap and the valve body.

[0017] Further, a clamping groove is provided on the outer wall of one end of the insertion cylinder. The clamping groove is arranged along the circumference of the insertion cylinder. A clamping block is annularly provided on the inner wall of one end of the oil pipe. The clamping groove is adapted to the clamping block, and the detachable connection between the insertion cylinder and the oil pipe is realized by the clamping connection between the clamping block and the clamping groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the oil extraction and refueling device of the present invention;

[0019] Figure 2 is a side view of the oil extraction and refueling device of the present invention;

[0020] Figure 3 is Figure 2 a schematic cross-sectional view taken along line A-A in

[0021] Figure 4 is Figure 2 a schematic cross-sectional view taken along line B-B in

[0022] Among them, the above-mentioned drawings include the following reference numerals: 10 - connection valve assembly; 11 - valve body; 12 - steel ball; 13 - spring; 14 - snap ring; 15 - oil cap; 16 - annular limit block; 17 - second sealing ring; 18 - third sealing ring; 111 - first connection end; 112 - second connection end; 101 - first through hole; 102 - second through hole; 103 - steel ball mounting hole; 104 - guide groove; 20 - oil pipe assembly; 21 - insertion cylinder; 211 - card slot; 22 - oil pipe; 221 - clamping block; 23 - connecting rod; 24 - convex block; 25 - first sealing ring.

[0023] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific embodiments

[0024] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0027] Please refer to Figures 1 to 4 , an oil extraction and refueling device of the present invention includes a connection valve assembly 10 and an oil pipe assembly 20 adapted to the connection valve assembly 10. In the actual operation process, the operation of extracting oil from the gearbox or refueling the gearbox can be realized through the cooperation of the oil pipe assembly 20 and the connection valve assembly 10.

[0028] As an example, the connection valve assembly 10 is used to be installed at the oil drain port of the transmission. Specifically, the connection valve assembly 10 includes a valve body 11, a steel ball 12 disposed within the valve body 11, and an oil cap 15 adapted to the valve body 11. The setting of the oil cap 15 can prevent oil leakage and debris from entering the valve body 11 to contaminate the oil. In this embodiment, the oil cap 15 is installed on the valve body 11 by means of threaded connection. The valve body 11 includes a first connection end 111 and a second connection end 112 which are oppositely arranged. The first connection end 111 is used to connect the oil drain port of the transmission, and the oil cap 15 is sleeved on the circumferential direction of the second connection end 112. A channel is provided within the valve body 11, and the steel ball 12 is used to block the channel. In this embodiment, a first through hole 101 is provided within the first connection end 111, a second through hole 102 is provided in the second connection end 112, and a steel ball mounting hole 103 is provided within the valve body 11 between the first connection end 111 and the second connection end 112. The first through hole 101, the steel ball mounting hole 103, and the second through hole 102 are sequentially connected to form a channel. The steel ball mounting hole 103 is adapted to the steel ball 12, and the second through hole 102 is adapted to the insertion cylinder 21. When the inner wall of the steel ball mounting hole 103 is in close contact with the surface of the steel ball 12, the end face of the end of the steel ball 12 away from the snap ring 14 is located within the second through hole 102, and the channel is in a closed state. It should be noted that the connection valve assembly 10 in the present utility model is not limited to connecting to the oil drain port of the transmission, and can also be connected to other devices through structures such as an adapter threaded port, which can greatly enrich the application scenarios of the entire oil extraction and refueling device and improve the applicability.

[0029] Further, the diameter of the first through hole 101 is the same as that of the steel ball 12, the aperture of the second through hole 102 is the same as the rod body length of the connecting rod 23, and the aperture of the second through hole 102 is larger than the aperture of the first through hole 101. The aperture of the steel ball mounting hole 103 gradually decreases from the first through hole 101 towards the second through hole 102, and the inner wall of the steel ball mounting hole 103 is adapted to the surface of the steel ball 12, so that the steel ball 12 can be in close fit with the steel ball mounting hole 103, thereby realizing the blocking of the channel by the steel ball 12 and preventing the oil in the transmission from leaking.

[0030] Further, the connection valve assembly 10 further includes a snap ring 14 and a spring 13. The snap ring 14 is embedded within the first through hole 101. One side of the snap ring 14 is connected to one end of the spring 13, and the other end of the spring 13 is connected to the steel ball 12. When the spring 13 is in a free state, the surface of the steel ball 12 is in close contact with the inner wall of the steel ball mounting hole 103. As a specific example, in this embodiment, the snap ring 14 is disposed near the through port of the first through hole 101 to prevent the spring 13 from disengaging from the first through hole 101; the spring 13 is a conical helical spring 13. The large coil of the conical helical spring 13 is fixedly connected to the inner side wall of the snap ring 14, and the small coil of the conical helical spring 13 pushes the steel ball 12 to be in close fit with the inner wall of the steel ball mounting hole 103.

[0031] Further, an annular limiting block 16 extends along the radial direction of the inner wall of the second through hole 102. A limiting groove is formed between the annular limiting block 16 and the end of the steel ball mounting hole 103. The limiting groove is adapted to the connecting rod 23. By limiting the connecting rod 23 through the limiting groove, the insertion cylinder 21 can be limited and fixed within the valve body 11 to prevent the insertion cylinder 21 from falling off from the valve body 11.

[0032] Further, guiding grooves 104 are respectively provided on two opposite sides of the inner wall of the annular limiting block 16. The guiding grooves 104 are arranged along the axial direction of the second through hole 102, and the guiding grooves 104 communicate with the limiting groove. The guiding grooves 104 are adapted to the connecting rod 23.

[0033] Further, the connecting valve assembly 10 further includes a second sealing ring 17. Specifically, in this embodiment, a second sealing groove is provided on the circumferential outer wall of the first connecting end 111, and the second sealing ring 17 is provided in the second sealing groove. During actual operation, the first connecting end 111 of the valve body 11 is fixedly connected to the oil drain port of the gearbox by means of threaded connection. The provision of the second sealing ring 17 on the valve body 11 can reduce the gap at the connection between the valve body 11 and the oil drain port of the gearbox and improve the sealing performance at the connection between the oil drain port of the gearbox and the valve body 11 to prevent the oil in the gearbox from leaking.

[0034] The connecting valve assembly 10 includes a third sealing ring 18. The third sealing ring 18 is used to reduce the gap at the connection between the oil cap 15 and the valve body 11 and improve the sealing performance of the connection between the oil cap 15 and the valve body 11 to further prevent oil leakage and debris from entering the valve body 11 and contaminating the oil. Specifically, in this embodiment, a third sealing groove is provided on the circumferential outer wall of the middle part of the valve body 11, and the third sealing ring 18 is provided in the third sealing groove. When the oil cap 15 is sleeved on the second connecting end 112, the third sealing ring 18 is located between the oil cap 15 and the valve body 11.

[0035] As an example, the oil pipe assembly 20 is used to be inserted into the valve body 11 for oil extraction and refueling operations. Specifically, the oil pipe assembly 20 includes an insertion cylinder 21 and an oil pipe 22 detachably connected to one end of the insertion cylinder 21. The insertion cylinder 21 is used to be inserted into the valve body 11 from the second connecting end 112. A connecting rod 23 is provided at the mouth of the other end of the insertion cylinder 21. The connecting rod 23 is arranged along the radial direction of the mouth of the cylinder. In this embodiment, the connecting rod 23 is a connecting rod in the shape of a cuboid. The connecting rod 23 is located at the center of the mouth of the insertion cylinder, and one side of the connecting rod 23 is connected to the end of the mouth of the insertion cylinder 21. A convex block 24 is provided in the middle of the side of the connecting rod 23 facing away from the insertion cylinder 21. The convex block 24 is used to push open the steel ball 12 to conduct the channel.

[0036] Further, in this embodiment, a clamping groove 211 is provided on the outer wall of one end of the insertion cylinder 21. The clamping groove 211 is arranged along the circumferential direction of the insertion cylinder 21. A clamping block 221 is annularly arranged on the inner wall of one end of the oil pipe 22. The clamping groove 211 is adapted to the clamping block 221. In actual use, one end of the oil pipe 22 provided with the clamping block 221 is sleeved on one end of the insertion cylinder 21 provided with the clamping groove 211, and the detachable connection between the oil pipe 22 and the insertion cylinder 21 is realized through the clamping of the clamping block 221 and the clamping groove 211. In order to reinforce the connection stability between the two, auxiliary reinforcing members such as wire ties can also be used outside the oil pipe 22 for reinforcement treatment to prevent the oil pipe 22 from detaching from the insertion cylinder 21 during use and affecting the oil extraction and refueling process. It should be noted that the detachable connection between the oil pipe and the insertion cylinder in the present utility model is not limited to the above-mentioned embodiment of clamping through the arrangement of the clamping block and the clamping groove, and can also be other connection methods such as threaded fastening connection and expansion sleeve connection that can achieve the purpose of the present utility model.

[0037] Further, both ends of the connecting rod 23 respectively extend beyond the outer wall of the barrel mouth of the insertion cylinder 21. When the connecting rod 23 enters the second through hole 102 and follows the guiding groove 104 into the limiting groove, the parts of both ends of the connecting rod 23 extending beyond the insertion cylinder 21 are located in the limiting groove, and the outer circumferential wall of the insertion cylinder 21 is in contact with the inner wall of the annular limiting block 16 or the second through hole 102.

[0038] Further, the oil pipe assembly 20 further includes a first sealing ring 25. The first sealing ring 25 is used to reduce the gap between the outer circumferential wall of the insertion cylinder 21 and the inner circumferential wall of the second through hole 102 when the insertion cylinder 21 is inserted into the second through hole 102 of the valve body 11, so as to prevent oil leakage during the oil extraction and refueling process. Specifically, in this embodiment, a first sealing groove is provided on the outer circumferential wall of the insertion cylinder 21, and the first sealing ring 25 is arranged in the first sealing groove. When the insertion cylinder 21 is inserted into the valve body 11, the first sealing ring 25 is located in the second connection end 112.

[0039] In actual use, the use principle of the oil extraction and refueling device of the utility model can be as follows: the oil cap 15 on the second connecting end 112 of the valve body 11 is unscrewed to expose the second through hole 102 on the valve body 11, and then the insert sleeve 21 in the oil pipe assembly 20 is inserted into the second through hole 102. In this process, the connecting rod 23 on the insert sleeve 21 will enter the limiting groove along the guide groove 104. When the insert sleeve 21 is inserted into place, the insert sleeve 21 is rotated so that the connecting rod 23 and the guide groove 104 are misaligned to limit the connecting rod 23 in the limiting groove. At this time, the steel ball 12 in the valve body 11 is pushed open by the protrusion 24 on the connecting rod 23, and a gap appears between the surface of the steel ball 12 and the inner wall of the steel ball mounting hole 103. The channel in the valve body 11 is connected, and the oil of the gearbox can flow out of the valve body 11 through the channel and flow out along the insert sleeve 21 and the inner wall of the oil pipe 22, thereby achieving the purpose of oil extraction. When it is necessary to add an equal amount of new oil, the new oil can also be added to the gearbox from the oil drain port at the bottom of the gearbox through the oil passage formed by the oil pipe 22, the insert 21 and the valve body 11. The added new oil can be evenly mixed with the original liquid in the gearbox to improve the reliability of the oil sample and avoid affecting the detection effect of the oil sample. When the oil extraction and refueling operation is completed, the insert 21 can be rotated again so that the connecting rod 23 on the insert 21 is aligned with the guide groove 104 and withdraws from the limit groove along the guide groove 104, and finally withdraws from the valve body 11. In this process, the steel ball 12 will move under the reaction force of the spring 13 until the steel ball 12 is tightly attached to the inner wall of the steel ball mounting hole 103 and the channel is closed. Then the oil cap 15 is installed on the second connecting end 112 of the valve body 11 to prevent oil leakage and impurities from entering the valve body 11 to contaminate the oil.

[0040] In summary, the beneficial effect of the oil extraction and refueling device of the utility model is that the oil extraction and refueling operation of the gearbox oil can be quickly realized by connecting the valve assembly and the oil pipe assembly, and the operation is very convenient. There is no need to disassemble the air filter structure, intake pipe and bottom guard plate of the whole vehicle. The time from parking the vehicle to sampling from the gearbox can be greatly shortened, and the efficiency of oil extraction and refueling can be effectively improved, so that the oil in the gearbox can be sampled when it is in a uniform state, thereby greatly improving the reliability of the oil sample. Specifically, the connecting valve assembly includes a valve body, a steel ball arranged in the valve body, and an oil cap adapted to the valve body. The first connecting end of the valve body is used to connect the oil drain port of the gearbox, and a channel is arranged in the valve body. The steel ball is used to close the channel to prevent oil leakage; the oil pipe assembly includes an insert and an oil pipe. The insert is used to be inserted into the valve body from the second connecting end of the valve body. A connecting rod is arranged at the barrel mouth of the insert, and a protrusion is arranged on the connecting rod. In actual use, the steel ball is pushed open by the protrusion to open the channel in the valve body to complete the oil extraction and refueling operation.

[0041] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0042] The above-described embodiments only represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present utility model application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model application shall be subject to the appended claims.

Claims

1. An oil extraction and refueling device, characterized in that, It includes a connecting valve assembly and an oil pipe assembly adapted to the connecting valve assembly. The connecting valve assembly includes a valve body, a steel ball disposed in the valve body, and an oil cap adapted to the valve body. The valve body includes a first connecting end and a second connecting end disposed opposite to each other. The first connecting end is used to connect to the oil drain port of the gearbox. The oil cap is sleeved on the circumference of the second connecting end. A channel is provided in the valve body, and the steel ball is used to close the channel. The oil pipe assembly includes an insertion cylinder and an oil pipe detachably connected to one end of the insertion cylinder. The insertion cylinder is used to be inserted into the valve body from the second connecting end. A connecting rod is provided at the mouth of the other end of the insertion cylinder. The connecting rod is disposed radially along the mouth of the cylinder. A convex block is provided in the middle of the side of the connecting rod facing away from the insertion cylinder. The convex block is used to push open the steel ball to conduct the channel.

2. The oil extraction and refueling device according to claim 1, wherein Both ends of the connecting rod extend beyond the outer wall of the mouth of the insertion cylinder.

3. The oil extraction and refueling device according to claim 1, characterized in that, The oil pipe assembly further includes a first sealing ring. A first sealing groove is provided on the outer circumferential wall of the insertion cylinder. The first sealing ring is provided in the first sealing groove. When the insertion cylinder is inserted into the valve body, the first sealing ring is located inside the second connecting end.

4. The oil extraction and refueling device according to claim 1, characterized in that A first through hole is provided in the first connecting end. A second through hole is provided in the second connecting end. A steel ball mounting hole is provided in the valve body between the first connecting end and the second connecting end. The first through hole, the steel ball mounting hole, and the second through hole are sequentially communicated to form the channel. The steel ball mounting hole is adapted to the steel ball. The second through hole is adapted to the insertion cylinder. When the inner wall of the steel ball mounting hole is in close contact with the surface of the steel ball, the end face of the end of the steel ball away from the opening of the first through hole is located inside the second through hole, and the channel is in a closed state.

5. The oil extraction and refueling device according to claim 4, wherein The diameter of the first through hole is the same as that of the steel ball. The diameter of the second through hole is the same as the length of the rod body of the connecting rod, and the diameter of the second through hole is larger than the diameter of the first through hole.

6. The oil extraction and refueling device according to claim 4, wherein The connecting valve assembly further includes a circlip and a spring. The circlip is embedded in the first through hole. One side of the circlip is connected to one end of the spring. The other end of the spring is connected to the steel ball. When the spring is in a free state, the surface of the steel ball is in close contact with the inner wall of the steel ball mounting hole.

7. The oil extraction and refueling device according to claim 4, characterized in that, An annular limiting block extends radially along the inner wall of the second through hole. A limiting groove is formed between the annular limiting block and the end of the steel ball mounting hole. The limiting groove is adapted to the connecting rod.

8. The oil extraction and refueling device according to claim 7, characterized in that Guide grooves are respectively provided on two opposite sides of the inner wall of the annular limiting block. The guide grooves are disposed along the axial direction of the second through hole, and the guide grooves are communicated with the limiting groove. The guide grooves are adapted to the connecting rod.

9. The oil extraction and refueling device according to claim 1, characterized in that, The connecting valve assembly further includes a second sealing ring and a third sealing ring. A second sealing groove is provided on the outer circumferential wall of the first connecting end. The second sealing ring is provided in the second sealing groove. A third sealing groove is provided on the outer circumferential wall in the middle of the valve body. The third sealing ring is provided in the third sealing groove. When the oil cap is sleeved on the second connecting end, the third sealing ring is located between the oil cap and the valve body.

10. The oil extraction and refueling device according to claim 1, characterized in that, A clamping groove is provided on the outer wall of one end of the insertion cylinder, the clamping groove is arranged along the circumferential direction of the insertion cylinder, a clamping block is annularly arranged on the inner wall of one end of the oil pipe, the clamping groove is adapted to the clamping block, and the detachable connection between the insertion cylinder and the oil pipe is realized by clamping the clamping block and the clamping groove.

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