Oil extraction device

Abstract

The utility model discloses an oil extraction device which comprises a hollow valve seat with two open ends, an oil inlet hole is formed in the side wall of the valve seat, and a first sealing ring is arranged between the outer wall of the valve seat and the inner wall of a component to be subjected to oil extraction; a reducing opening is formed in the inner side of the valve seat; a valve cover is arranged at one end of the valve seat far away from the to-be-extracted oil component; a lining is fixed to the end, facing the component to be subjected to oil extraction, of the valve seat. A valve block is arranged in the valve seat, and the end, facing the reducing opening, of the valve block is movably arranged in the reducing opening in a sleeved mode. An extrusion plate is fixed to the outer side of the valve block, and a second sealing ring is arranged between the extrusion plate and the reducing opening. A sealing spring is arranged between the valve block and the lining, and the two ends of the sealing spring abut against the extrusion plate and the lining respectively; and a third sealing ring is arranged at the joint of the valve seat and the valve cover. The oil extraction device can safely, simply and quickly complete the oil extraction action, the sealing effect is safely and stably achieved after oil extraction, the sealing effect is good, and the whole device is easy to manufacture, low in manufacturing cost, capable of being produced and machined in batches and long in service life.

Description

Technical Field

[0001] The utility model relates to the technical field of low-pressure oil extraction, in particular to an oil extraction device. Background Art

[0002] Lubricating oil and fuel used in various parts of engines (especially aircraft engines) need to be regularly removed for quality testing and then disposed of accordingly. Traditionally, oil removal requires opening the oil valve at the corresponding oil hole in the engine to remove the oil, then reclosing the valve. However, existing oil valves close slowly after removal, and oil can still leak during the closing process, contaminating the engine exterior and posing a safety hazard. Therefore, the design of an oil removal device is crucial for achieving safe, convenient, and rapid extraction. Utility Model Content

[0003] In order to solve the above problems, the purpose of the present invention is to provide an oil extraction device which is convenient and quick to extract oil, has good sealing effect, can be mass-produced and processed, and meets the demand for low-pressure oil extraction from various parts at a low cost.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] An oil extraction device includes a valve seat, the interior of which is hollow and open at both ends. One end of the valve seat is installed in the component to be extracted and an oil inlet hole communicating with the inside and outside of the valve seat is provided on its side wall. At the same time, the outer wall of the end and the inner wall of the component to be extracted are sealed by a first sealing ring preset on the outer wall of the valve seat. The other end of the valve seat is located outside the component to be extracted. A reduced diameter opening with an inner diameter smaller than that of the valve seat is provided on the inner side of the valve seat. A valve cover is detachably connected to the end of the valve seat away from the component to be extracted for sealing the end. A bushing is fixed to the end of the valve seat facing the component to be extracted for sealing the end. Inside the valve seat, a plurality of sealing rings are provided. A valve block is provided that can move back and forth between the reduced diameter opening and the bushing, and one end of the valve block facing the reduced diameter opening is movably sleeved in the reduced diameter opening; an extrusion plate with an outer diameter larger than the inner diameter of the reduced diameter opening is fixed on the outside of the valve block, and the extrusion plate and the reduced diameter opening are sealed by a second sealing ring preset on the outside of the valve block; a sealing spring is installed between the valve block and the bushing, and the two ends of the sealing spring are respectively pressed against the extrusion plate and the bushing. Under the action of the sealing spring, the second sealing ring is pressed by the extrusion plate and sealed on the side of the reduced diameter opening facing the bushing; the connection between the valve seat and the valve cover is sealed by a preset third sealing ring.

[0006] Furthermore, the valve cover is threadedly connected to an end of the valve seat away from the component to be extracted oil, and the third sealing ring is arranged on the outer wall of the valve cover.

[0007] Furthermore, the second sealing ring is sleeved in an annular sealing groove preset on the valve block, and the outer diameter of the second sealing ring is larger than the inner diameter of the reduced diameter opening.

[0008] Furthermore, to ensure smooth oil inlet, the oil inlet holes are multiple and evenly distributed on the outer wall of the valve seat located at one end inside the component to be taken oil.

[0009] and a valve seat assembly, said valve body being arranged on the outer wall of the valve body and on the outer wall of the valve seat, so that the oil outlet can be adjusted according to the demand of the valve body.

[0010] Furthermore, in order to ensure the sealing effect, the diameter of the through hole near one end of the push plate is enlarged to form a threaded hole, which has an internal thread and its inner diameter is smaller than the push plate; correspondingly, a protrusion with an external thread is provided on the side of the push plate facing the valve cover, and the protrusion can be threadedly connected to the threaded hole, so that the push plate presses the fifth sealing ring 16 onto the valve cover.

[0011] Furthermore, the diameter of the through hole away from one end of the push plate is expanded to form an operating hole with a diameter larger than that of the pressing head; the reset spring is located in the operating hole; and the pressing head can enter the operating hole under the action of external force.

[0012] Furthermore, in order to protect the oil outlet and the extrusion mechanism, prevent accidental touching of the pressing head and avoid dust accumulation, the oil extraction device also includes a protective cover; the protective cover is threadedly connected to one end of the valve seat outside the component to be extracted oil, and covers the oil outlet and the extrusion mechanism therein.

[0013] Furthermore, a sixth sealing ring is provided between the connection between the protective cover and the valve seat for sealing the gap between the two.

[0014] Furthermore, the first sealing ring, the second sealing ring, the third sealing ring, the fourth sealing ring, the fifth sealing ring and the sixth sealing ring are all rubber sealing rings.

[0015] The utility model can complete the oil extraction action safely, simply and quickly, and the device can achieve a safe and stable sealing effect after extracting oil, and the sealing effect is good. The entire device is simple to manufacture and has a low manufacturing cost. It can be mass-produced and processed, and meets the demand for low-cost oil extraction from various parts of the aircraft. The device can be reused for tens of thousands of times and has a long service life, which meets the service life of the aircraft and does not need to be replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be described in further detail below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic structural diagram of the oil extraction device described in Example 1 of the present utility model.

[0018] Figure 2 This is a structural diagram of the oil extraction device described in Example 2 of the present utility model.

[0019] Figure 3 This is a structural diagram of the oil extraction device described in Example 3 of the present utility model.

[0020] Figure 4 This is a schematic structural diagram of the oil extraction device described in Example 5 of the present utility model.

[0021] As shown in the figure: 1-valve cover, 2-valve seat, 21-reduced diameter port, 22-oil inlet hole, 3-valve block, 31-extrusion, 4-sealing spring, 5-bushing, 6-first sealing ring, 7-second sealing ring, 8-third sealing ring, 9-push plate, 10-push rod, 11-return spring, 12-pressing head, 13-oil outlet hole, 14-protective cover, 15-fourth sealing ring, 16-fifth sealing ring, 17-sixth sealing ring. DETAILED DESCRIPTION

[0022] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The embodiments described are merely a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0023] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in this specification for the understanding and reading of those familiar with this technology, and are not used to limit the conditions for the implementation of this utility model. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in this utility model without affecting the efficacy and purpose of the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of this utility model. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of this utility model without substantially changing the technical content.

[0024] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" 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. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. It should be noted that the terms "include", "comprise" or any other variants are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or device. Example 1

[0025] like Figure 1 As shown, this embodiment provides an oil extraction device, including a valve seat 2, a valve cover 1, a bushing 5, a valve block 3 and a sealing spring 4.

[0026] The valve seat 2 is a cylindrical structure with a hollow interior and open ends. By varying the external shape and dimensions of the valve seat 2, it can meet the requirements of oil extraction in different spaces and locations. One end of the valve seat 2 is installed within the component to be extracted. An oil inlet hole 22 is provided on the sidewall of the end of the valve seat 2 that extends into the component to be extracted, connecting the inside and outside of the valve seat 2. This end's outer wall is sealed with the inner wall of the component to be extracted by a first sealing ring 6 pre-installed on the outer wall of the valve seat 2. The other end of the valve seat 2 is located outside the component to be extracted. A reduced diameter opening 21 with an inner diameter smaller than the inner diameter of the valve seat is provided on the inside of the valve seat 2 (the reduced diameter opening 21 is formed by an inward protrusion on the inner side of the valve seat 2). To ensure smooth oil inflow, multiple oil inlet holes 22 are evenly distributed on the outer wall of the valve seat 2 at the end within the component to be extracted.

[0027] The valve cover 1 is detachably connected to the end of the valve seat 2 away from the oil extraction component by a threaded connection, thereby sealing the end of the valve seat 2 away from the oil extraction component. The connection between the valve cover 1 and the valve seat 2 is sealed by a third sealing ring 8 pre-set on the outer wall of the valve cover 1.

[0028] The bushing 5 is fixed to the end of the valve seat 2 facing the oil extraction component by welding and blocks the end. A cylindrical protrusion extending into the valve seat 2 is provided on the side of the bushing 5 facing the valve seat 2 .

[0029] The valve block 3 is disposed within the valve seat 2 and located between the reduced-diameter opening 21 and the bushing 5. The valve block 3 can move back and forth between the reduced-diameter opening 21 and the bushing 5. The end of the valve block 3 facing the reduced-diameter opening 21 is movably mounted within the reduced-diameter opening 21. A squeeze plate 31, whose outer diameter is greater than the inner diameter of the reduced-diameter opening 21 and is located between the reduced-diameter opening 21 and the bushing 5, is fixed to the center of the outer side of the valve block 3. The squeeze plate 31 and the reduced-diameter opening 21 are sealed by a second sealing ring 7 pre-installed on the outside of the valve block 3. The second sealing ring 7 is mounted within a pre-set annular sealing groove on the valve block 3 (located between the squeeze plate 31 and the reduced-diameter opening 21). The outer diameter of the second sealing ring 7 is greater than the inner diameter of the reduced-diameter opening 21.

[0030] The sealing spring 4 is installed between the valve block 3 and the bushing 5. One end of the sealing spring 4 is sleeved outside the valve block 3 and pressed against the extrusion plate 31, and the other end is sleeved outside the cylindrical protrusion of the bushing 5 and pressed against the bushing 5. Under the action of the sealing spring 4, the second sealing ring 7 is pressed by the extrusion plate 31 and sealed on the side of the reducing port 21 facing the bushing 5, thereby realizing the sealing between the reducing port 21 and the valve block 3.

[0031] The first sealing ring 6 , the second sealing ring 7 and the third sealing ring 8 are all rubber sealing rings.

[0032] How it works

[0033] Installation process: Install the second sealing ring 7 in the annular sealing groove of the valve block 3, and then put the valve block 3 and the sealing spring 4 with the second sealing ring 7 installed into the inner hole of the valve seat 2 (facing the side of the component to be removed from the oil), install the bushing 5 and use the tooling to press and weld the valve seat 2 and the bushing 5 firmly, install the first sealing ring 6 in the preset sealing groove on the outside of the valve seat 2; install the third sealing ring 8 in the sealing groove of the valve cover 1; screw the valve cover 1 with the third sealing ring 8 installed into the internal thread of the valve seat 2 to form a complete set of oil removal device, and the oil enters the space inside the valve seat 2 near the side of the component to be removed from the oil inlet hole 21.

[0034] Usage process: unscrew the valve cover 1, use a rod-shaped tool to reach into the valve seat 2 to squeeze the end face of the valve block 3, the sealing spring 4 is compressed and deformed to store energy, so that the valve block 3 moves out of the reduced diameter port 21, connecting the internal space of the valve seat 2 of the reduced diameter port 21, and the oil in the space inside the valve seat 2 close to the side of the component to be extracted from the reduced diameter port 21 enters the space inside the valve seat 2 away from the side of the component to be extracted from the reduced diameter port, and finally flows out from the end of the valve seat 2 away from the component to be extracted, completing the oil extraction, and easily achieving the oil extraction effect; after the oil extraction is completed, the squeezing force on the valve block 3 is cancelled, the sealing spring 4 restores its original elastic force to release energy and push the valve block 3 toward the reduced diameter port 21 to move and reset, and the squeezing plate 31 on the valve block 3 is also reset synchronously, pressing the second sealing ring 7, and the second sealing ring 7 seals the reduced diameter port 21 to complete the closing and sealing effect, and screw on the valve cover 1 to achieve the sealing effect of the entire oil extraction device. Example 2

[0035] After the valve cover 1 is opened in the structure of Example 1, a tool for pushing the valve block is needed to squeeze the valve block. After the oil is extracted, the tool must be removed and the valve cover 1 is closed, which invisibly reduces the oil extraction efficiency. In order to improve the oil extraction efficiency, there is no need to find a separate tool for pushing the valve block. This embodiment adds the following structure based on Example 1:

[0036] like Figure 2 As shown, the oil extraction device further includes an oil outlet 13 and a squeezing mechanism.

[0037] The oil outlet hole 13 is disposed within the valve cover 1 and extends through the exterior of the valve cover 1 and the interior of the valve seat 1. The oil outlet hole 13 is tilted and positioned below the extrusion mechanism, with the side of the oil outlet hole 13 facing the interior of the valve seat 2 positioned higher and the side facing the exterior of the valve seat 2 positioned lower. The radial cross-section of the oil outlet hole 13 is arc-shaped (similar to a crescent shape), facilitating rapid oil outflow.

[0038] The extrusion mechanism is arranged above the oil outlet 13, and includes a pressing head 12, a push plate 9, a push rod 10, a return spring 11, a fourth sealing ring 15 and a fifth sealing ring 16; the pressing head 12 is arranged outside the valve cover 1, is cylindrical, and has an external thread on the outer wall; the push plate 9 is arranged in the valve seat 2 and is located between the valve cover 1 and the reduced diameter port 21. The push plate 9 can move toward the reduced diameter port 21 and can push the valve block 3 out of the reduced diameter port 21, so that the internal space of the valve seat 2 on both sides of the reduced diameter port 21 is connected. In order to ensure the sealing effect, at the beginning (before taking oil), the two sides of the push plate 9 are respectively close to the valve cover 1 and the valve block 3, so that when the sealing spring 4 and the return spring Under the combined action of the push plate 9 and the push rod 11, the push plate 9 is tightly fitted to the valve cover 1, blocking the through hole and the oil outlet hole 13 to ensure sealing. One end of the push rod 10 moves through the preset through hole in the middle of the valve cover 1 and is fixedly connected to the push plate 9. The other end of the push rod 10 extends outside the valve cover 1 and is fixedly connected to the pressing head 12. The return spring 11 is sleeved outside the push rod 10 and located between the pressing head 12 and the valve cover 1. The outer diameter of the return spring 11 is smaller than that of the pressing head 12. The fourth sealing ring 15 is disposed between the outer wall of the push rod 10 and the inner wall of the through hole. The fifth sealing ring 16 is disposed on the side of the push plate 9 facing the valve cover 1 and is located between the push plate 9 and the valve cover 1. The fourth sealing ring 15 and the fifth sealing ring 16 are rubber sealing rings.

[0039] When taking oil, there is no need to open the valve cover 1. Just press the pressing head 12 inward to compress the return spring 11. The return spring 11 is compressed, deformed and stores energy. The pressing head 12 drives the push rod 10 and the push plate 9 to move toward the inside of the component to be taken out of the oil. The push plate 9 pushes the valve block 3 to move. The sealing spring 4 is compressed, deformed and stores energy, so that the valve block 3 moves out of the reduced diameter port 21 and connects to the internal space of the valve seat 2 of the reduced diameter port 21. The oil in the space inside the valve seat 2 near the side of the component to be taken out of the oil enters the space inside the valve seat 2 away from the side of the component to be taken out from the reduced diameter port 21, and finally flows out from the end of the valve seat 2 away from the component to be taken out, completing the oil taking, and easily achieving the oil taking effect.

[0040] After the oil is extracted, the pressing head 12 is no longer pressed, and the reset spring 11 resets, stretches and releases energy, pushing the pressing head 12 to move in the opposite direction and driving the push rod 10 and the push plate 9 to move in the opposite direction, canceling the extrusion force on the valve block 3, and the sealing spring 4 restores its original elastic force, stretches and releases energy and pushes the valve block 3 to move toward the reduced diameter port 21 and reset. The extrusion plate 31 on the valve block 3 is also reset synchronously, pressing the second sealing ring 7, and the second sealing ring 7 seals the reduced diameter port 21. At the same time, the valve block 3 presses the push plate sealing spring 4 and the reset spring 11 to seal the through hole and the oil outlet 13, completing the closing and sealing effect, and screwing on the valve cover 1 to achieve the sealing effect of the entire oil extraction device. Example 3

[0041] In order to ensure the sealing effect, this embodiment adds the following structure on the basis of embodiment 2:

[0042] like Figure 3 As shown, the through-hole near the end of the push plate 9 is enlarged to form a threaded hole. This threaded hole has internal threads and an inner diameter smaller than that of the push plate 9. Correspondingly, a protrusion with external threads is provided on the side of the push plate 9 facing the valve cover 1. This protrusion can be threaded into the threaded hole, allowing the push plate to press the fifth sealing ring 16 against the valve cover to achieve a seal. At this point, there is no contact between the push plate 9 and the valve block 3, and the distance between them is greater than or equal to the maximum depth that the protrusion can be screwed into the threaded hole.

[0043] When taking oil, there is no need to open the valve cover 1. The pressing head 12 is rotated inward. The pressing head 12 drives the push plate 9 to rotate and move toward the valve block 3 through the push rod 10 until the protrusion of the push plate 9 is completely out of the threaded hole of the valve cover 1; the pressing head 12 is pressed inward to compress the return spring 11. The return spring 11 is compressed and deformed to store energy, and the pressing head 12 drives the push rod 10 and the push plate 9 to move toward the inside of the component to be taken out of the oil. The push plate 9 first contacts the valve block 3 and pushes the valve block 3 to move. The sealing spring 4 is compressed and deformed to store energy, so that the valve block 3 moves out of the reduced diameter port 21 and connects to the internal space of the valve seat 2 of the reduced diameter port 21. The oil in the space inside the valve seat 2 near the side of the component to be taken out of the reduced diameter port 21 enters the space inside the valve seat 2 away from the side of the component to be taken out of the oil, and finally flows out from the end of the valve seat 2 away from the component to be taken out, completing the oil taking, and easily achieving the oil taking effect.

[0044] After the oil is extracted, the pressing head 12 is no longer pressed, and the reset spring 11 resets and stretches to release energy, pushing the pressing head 12 to move in the opposite direction and driving the push rod 10 and the push plate 9 to move in the opposite direction, canceling the extrusion force on the valve block 3, and the sealing spring 4 restores its original elastic force to release energy and push the valve block 3 to move toward the reduced diameter port 21 and reset. The extrusion plate 31 on the valve block 3 is also reset synchronously, pressing the second sealing ring 7, and the second sealing ring 7 seals the reduced diameter port 21. Then, the pressing head 12 is continuously rotated, and the pressing head 12 drives the push plate 9 to rotate and move away from the valve block 3 through the push rod 10. After the protrusion of the push plate 9 is completely screwed into the threaded hole of the valve cover 1, the push plate 9 presses the fifth sealing ring 16 to complete the closing and sealing effect, and the valve cover 1 is screwed on to achieve the sealing effect of the entire oil extraction device. Example 4

[0045] In order to protect the oil outlet 13 and the extrusion mechanism, prevent accidental contact with the pressing head 12 and avoid dust accumulation, this embodiment adds the following structure on the basis of embodiment 3:

[0046] like Figure 4 As shown, the oil extraction device also includes a protective cover 14; this cover 14 is threaded onto the end of the valve seat 2 located outside the component to be extracted, enclosing the oil outlet 13 and the extrusion mechanism. A sixth sealing ring 17 is provided between the connection between the protective cover 14 and the valve seat 2 to seal the gap between them. This sixth sealing ring 17 is a rubber sealing ring.

[0047] When the oil is not being taken, the protective cover 14 is directly covered; when the oil is being taken, the protective cover 14 is opened. Example 5

[0048] In order to make the structure more compact and reduce material costs, this embodiment adds the following structure on the basis of any one of Embodiments 2-4:

[0049] like Figure 2-4 As shown, the diameter of the through hole away from one end of the push plate is expanded to form an operating hole with a diameter larger than that of the pressing head 12; the return spring 11 is located in the operating hole; and the pressing head 12 can enter the operating hole under the action of external force.

[0050] Other aspects of the present invention that are not described in detail are all conventional technologies known to those skilled in the art.

[0051] It should be noted that the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements that are inherent to such process, method, article, or apparatus.

[0052] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific implementation methods. Any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. An oil extraction device, comprising a valve seat, the valve seat being hollow and open at both ends; one end of the valve seat being mounted within a component to be extracted; and a side wall of the valve seat being provided with an oil inlet hole communicating with the inside and outside of the valve seat; an outer wall of the valve seat being sealed against an inner wall of the component to be extracted by a first sealing ring pre-set on the outer wall of the valve seat; and the other end of the valve seat being located outside the component to be extracted; characterized in that: A reducing port with an inner diameter smaller than that of the valve seat is provided on the inner side of the valve seat; a valve cover is detachably connected to an end of the valve seat away from the component to be extracted with the oil; a sleeve is fixed to an end of the valve seat facing the component to be extracted with the oil, which seals the end; a valve block that can move back and forth between the reducing port and the sleeve is provided inside the valve seat, and the end of the valve block facing the reducing port is movably sleeved in the reducing port; an extrusion plate with an outer diameter larger than the inner diameter of the reducing port is fixed on the outer side of the valve block, and the extrusion plate and the reducing port are sealed by a second sealing ring preset outside the valve block; a sealing spring is installed between the valve block and the sleeve, and the two ends of the sealing spring are respectively pressed against the extrusion plate and the sleeve. Under the action of the sealing spring, the second sealing ring is pressed by the extrusion plate and sealed on the side of the reducing port facing the sleeve; the connection between the valve seat and the valve cover is sealed by a preset third sealing ring.

2. The oil extraction device according to claim 1, characterized in that: The valve cover is threadedly connected to the inner side of the end of the valve seat away from the oil-extracting component, and the third sealing ring is arranged on the outer wall of the valve cover.

3. The oil extraction device according to claim 1, characterized in that: The second sealing ring is sleeved in an annular sealing groove preset on the valve block, and the outer diameter of the second sealing ring is larger than the inner diameter of the reducing port.

4. The oil extraction device according to claim 1, characterized in that: There are multiple oil inlet holes evenly distributed on the outer wall of the valve seat located at one end of the component to be taken oil.

5. The oil extraction device according to any one of claims 1 to 4, characterized in that: and a valve seat that is opened and closed by a valve lift, so that the valve seat can be opened and closed by a valve lift.

6. The oil extraction device according to claim 5, characterized in that: The diameter of the through hole near one end of the push plate is expanded to form a threaded hole, which has an internal thread and an inner diameter smaller than the push plate; correspondingly, a protrusion with an external thread is provided on the side of the push plate facing the valve cover, and the protrusion can be threadedly connected in the threaded hole, so that the push plate presses the fifth sealing ring 16 onto the valve cover.

7. The oil extraction device according to claim 5, characterized in that: The diameter of the through hole away from one end of the push plate is expanded to form an operating hole with a diameter larger than that of the pressing head; the reset spring is located in the operating hole; and the pressing head can enter the operating hole under the action of external force.

8. The oil extraction device according to claim 5, characterized in that: It also includes a protective cover; the protective cover is threadedly connected to one end of the valve seat located outside the oil-extracting component, and covers the oil outlet hole and the extrusion mechanism therein.

9. The oil extraction device according to claim 8, characterized in that: A sixth sealing ring is provided between the connection between the protection cover and the valve seat for sealing the gap between the two.

10. The oil extraction device according to claim 9, characterized in that: The first sealing ring, the second sealing ring, the third sealing ring, the fourth sealing ring, the fifth sealing ring and the sixth sealing ring are all rubber sealing rings.

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