Zero-air-mixing oil suction assembly and hydraulic oil tank thereof

Abstract

The invention discloses a zero-air-mixing oil suction assembly and an oil tank thereof, the zero-air-mixing oil suction assembly comprises an oil suction shell, an inner cavity is an oil suction cavity, at least two of the top surface, the bottom surface and the circumferential outer edge are provided with oil suction ports, and the oil suction shell is further provided with a negative pressure port; the valve valves are connected with the oil suction ports in a one-to-one correspondence mode and comprise at least two elastic valve pieces, the size of a gap defined by the valve pieces is in positive correlation with the oil liquid pressure borne by the valve valves, and the minimum value is zero so that the oil suction ports can be closed. According to the zero-air-mixing oil suction assembly and the hydraulic oil tank thereof, the elastic valve piece can deform according to the borne oil pressure, the minimum gap size of the valve piece is zero so as to close the oil suction opening, air suction is avoided, the deformation degree of the valve piece and the gap size are in positive correlation with the oil pressure after the valve piece is subjected to oil pressure, and therefore the oil suction opening is opened; and the number of oil suction parts is increased by increasing the number of the oil suction ports, so that the oil suction efficiency is improved, and the oil suction amount is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic systems, in particular to a zero-air mixing oil suction component and a hydraulic oil tank thereof. Background Art

[0002] Hydraulic oil is a liquid specially used in hydraulic systems. It is the transmission medium in hydraulic systems. It plays the role of energy transmission, anti-wear, system lubrication, corrosion prevention, rust prevention, cooling and sealing in hydraulic systems. It is suitable for various types of hydraulic systems in manufacturing and industry.

[0003] In order to protect the engine or other mechanical devices and avoid mixing of air when sucking in hydraulic oil, in the prior art, a Chinese invention patent application document with application number CN202210437523.7 discloses an oil suction mechanism that does not suck air, including: an oil suction pipe, a connecting flange and an oil suction plate, one end of the connecting flange is fixedly connected to one end of the oil suction pipe, wherein the oil suction plate includes an upper cover, a lower cover and a plurality of hollow buoyancy balls, and the oil suction holes can be blocked by the hollow buoyancy balls to avoid the opening of the oil suction holes of the oil suction plate above the liquid surface when sucking hydraulic oil, thereby achieving the effect of avoiding air suction, protecting the engine and improving reliability.

[0004] However, when the above device is in use, when the oil suction plate is tilted, the suction force of the oil suction hole on the buoyancy ball and the gravity of the buoyancy ball are not in the same straight line, so that the buoyancy ball is subjected to forces in other directions, and the gravity of the buoyancy ball and the suction force it receives are balanced. In this state, there are differences in the forces exerted by the buoyancy ball on various parts of the oil suction hole, resulting in the buoyancy ball being unable to completely seal the oil suction hole, and thus a small range of vacuum suction problems. On the other hand, when absorbing oil, since some of the oil suction holes are blocked by the buoyancy ball and the number of oil suction holes on the oil suction plate is limited, the oil suction efficiency is reduced.

[0005] Therefore, it is necessary to improve the oil suction device in the prior art. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects in the prior art and provide a zero-air-mixing oil suction assembly and a hydraulic oil tank thereof which can further prevent air suction and improve oil suction efficiency.

[0007] In order to solve the above technical problems, the present invention provides a zero air mixing oil absorption component, comprising: An oil suction shell, wherein the inner cavity of the oil suction shell is an oil suction cavity, at least two of the top surface, the bottom surface and the circumferential outer edge of the oil suction shell are provided with oil suction ports, and the oil suction shell is also provided with a negative pressure port for connecting a negative pressure device, and both the oil suction port and the negative pressure port are communicated with the oil suction cavity; A valve, wherein the valve is connected to the oil suction port in a one-to-one correspondence, and the valve comprises at least two elastic valve sheets, and the size of the gap formed by the valve sheets is positively correlated with the oil pressure applied to the valve, and the minimum value is zero, so as to close the oil suction port.

[0008] Preferably, in order to ensure uniform force on the valve pieces and extend the service life, the valve pieces are distributed in a circumferential annular array along the oil suction port.

[0009] Preferably, in order to ensure that the valve pieces cooperate with each other to close the oil suction port before being subjected to oil pressure, and to ensure the sealing of the oil suction port after being blocked, the two ends of the valve piece are respectively a free end and a fixed end, the fixed end is adjacent to the inner wall of the oil suction port, the distance between the free end and the oil suction cavity is smaller than the distance between the fixed end and the oil suction cavity, and the free end is gradually transitioned to the fixed end.

[0010] Preferably, in order to further ensure the sealing performance, the side of the valve piece facing away from the oil suction chamber is an oil pressure surface, and in the valve valve in the closed state, the oil pressure surfaces of each valve piece are located on the same spherical surface.

[0011] Preferably, in order to improve the oil suction efficiency, adjacent oil suction ports are arranged closely together.

[0012] Preferably, in order to improve the oil suction efficiency, the top surface, the bottom surface and the circumferential outer edge of the oil suction shell are all provided with oil suction ports.

[0013] Preferably, in order to ensure that when the oil suction shell is in an inclined state, part of the oil suction ports on the top surface, the circumferential outer edge and the bottom surface of the oil suction shell are located below the hydraulic oil level, the oil suction shell is flat.

[0014] Preferably, in order to facilitate the oil suction port on the top surface of the oil suction shell to contact the oil, an oil seepage through hole is provided on the oil suction shell, and both ends of the oil seepage through hole extend to the top surface and the bottom surface of the oil suction shell respectively.

[0015] Preferably, in order to limit the deformation degree of the valve piece and prevent the valve piece from being subjected to excessive pressure and being difficult to return to its original shape, the valve valve also includes a limiter, which is used to limit the deformation degree of the valve piece to limit the size of the gap enclosed by the valve piece.

[0016] Preferably, in order to be able to adjust the degree of deformation according to the oil pressure applied to the valve plate, the limiting member is arranged on a side of the valve plate adjacent to the oil suction chamber, and the limiting member is an elastic limiting member.

[0017] In order to solve the above technical problems, the present invention also provides a hydraulic oil tank, comprising an oil storage tank and the zero air mixing oil suction assembly described in any one of the above technical solutions, the oil suction port of the zero air mixing oil suction assembly is located in the oil storage tank, so that after the negative pressure device is started, the hydraulic oil in the oil storage tank is transmitted through the oil suction shell through the oil suction port.

[0018] In summary, compared with the prior art, the zero air mixing oil suction assembly and its hydraulic oil tank of the present invention have an elastic valve sheet that can be deformed according to the oil pressure, and the minimum gap size of the valve sheet is zero to close the oil suction port and avoid air suction. After being subjected to oil pressure, the deformation degree and gap size of the valve sheet are positively correlated with the oil pressure, thereby opening the oil suction port, and the valve valves are distributed on at least two of the top surface, side surface and circumferential outer edge of the oil suction shell, thereby increasing the number of oil suction parts, thereby improving the oil suction efficiency and ensuring the oil suction amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the first embodiment; Figure 2 1 is a schematic diagram of the connection structure between the oil suction housing and the valve valve of the first embodiment; Figure 3 2 is a schematic structural diagram of the oil suction shell of the first embodiment; Figure 4 is a cross-sectional view of the oil suction shell of the first embodiment; Figure 5 is a schematic structural diagram of the valve valve of the first embodiment; Figure 6 is a structural schematic diagram of the valve valve of the first embodiment from another perspective; Figure 7 is a schematic structural diagram of a second embodiment; Figure 8 2 is a schematic diagram of the connection structure between the oil suction housing and the valve valve of the second embodiment; Fig. 9 is a schematic structural diagram of a third embodiment; Fig.10 is a schematic structural diagram of a valve valve according to a third embodiment; Fig.11 yes Fig.10 Explosion diagram of Fig.12 yes Fig.10 Schematic diagram of the explosion from another perspective; In the figure: 1. oil suction shell; 11. oil suction chamber; 12. oil suction port; 13. negative pressure port; 14. oil seepage hole; 2. valve; 21. valve sheet; 211. free end; 212. fixed end; 213. oil pressure surface; 22. valve pipe; 23. limiter; 231. bracket; 3. negative pressure pipe. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0021] First embodiment

[0022] like Figure 1-Figure 6 As shown, a zero air mixing oil absorption assembly according to a first embodiment of the present invention comprises: The oil suction shell 1 has an inner cavity of the oil suction shell 1 as an oil suction cavity 11. At least two of the top surface, the bottom surface and the circumferential outer edge of the oil suction shell 1 are provided with oil suction ports 12. The oil suction shell 1 is also provided with a negative pressure port 13 for connecting a negative pressure device. Both the oil suction port 12 and the negative pressure port 13 are connected to the oil suction cavity 11. The valve valve 2 is connected to the oil suction port 12 in a one-to-one correspondence. The valve valve 2 includes at least two elastic valve pieces 21. The size of the gap formed by the valve pieces 21 is positively correlated with the oil pressure applied to the valve valve 2 and the minimum value is zero, so as to close the oil suction port 12.

[0023] Specifically, the negative pressure port 13 of the oil suction shell 1 is arranged on the top surface of the oil suction shell 1, and the negative pressure port 13 is connected to the negative pressure pipe 3, and the negative pressure pipe 3 is used to connect a negative pressure device such as a negative pressure pump. When the oil suction assembly is used, the bottom surface of the oil suction shell 1 is immersed below the liquid level of the hydraulic oil, and the negative pressure device is started to generate negative pressure in the oil suction chamber 11 of the oil suction shell 1, and the hydraulic oil is sucked into the oil suction shell 1 through the negative pressure port 13, and then the sucked hydraulic oil is discharged through the negative pressure pipe 3 and transported to a mechanical device requiring hydraulic oil.

[0024] In order to prevent the oil suction port 12 located above the liquid surface from partially opening during the process of sucking the hydraulic oil, resulting in the suction of air, the air being mixed into the hydraulic oil and affecting the normal and stable use of the hydraulic oil mechanical device, a valve valve 2 is provided at the oil suction port 12 .

[0025] The specific structure of the valve valve 2 is as follows: Figure 5 and Figure 6 As shown, the valve valve 2 includes a valve tube 22 and a plurality of valve sheets 21 arranged in the valve tube 22, wherein the circumferential outer edge of the valve tube 22 is fixedly connected to the circumferential inner wall of the oil suction port 12, and the valve sheet 21 is an elastic metal sheet, one end of which is fixedly connected to the circumferential inner wall of the valve tube 22.

[0026] After the valve valve 2 adopts the above structure, when the oil is sucked, after the negative pressure pump is started, negative pressure is generated at the negative pressure port 13. When the oil suction shell 1 contacts the oil, the oil pressure acts on the valve piece 21 from the outside, and the negative pressure attraction acts on the valve piece 21 from the inside. The two cooperate with each other, so that the valve valve 2 is deformed toward the inside of the oil suction chamber 11, thereby increasing the gap of the valve piece 21, opening the oil suction port 12, and facilitating the oil to enter the oil suction chamber 11 through the gap of the valve piece 21; while the valve valve 2 partially located above the oil liquid surface is not in contact with the oil, and the oil pressure it is subjected to is zero. The negative pressure attraction acts on the valve valve 2, which is not enough to deform the valve piece 21, so that the valve pieces 21 are sealed and connected at this time, and the gap is zero, thereby blocking the oil suction port 12 to prevent air from being sucked into the oil suction port 12.

[0027] After the hydraulic oil is sucked, the oil suction shell 1 and the valve valve 2 are separated from the oil, and the negative pressure device stops running. The elastically deformed valve piece 21 restores its original shape and position, so that the valve pieces 21 are sealed and connected to each other, thereby blocking the oil suction port 12.

[0028] In addition, in the present embodiment, the oil suction ports 12 are distributed on the circumferential outer edge and the bottom surface of the oil suction shell 1. After adopting the above design, when the oil suction shell 1 extends into the oil, the oil suction ports 12 on the bottom surface and the circumferential outer edge are in contact with the oil, thereby increasing the number of valve valves 2 in contact with the oil, so that the number of oil suction ports 12 opened increases, which is beneficial to increase the oil suction efficiency and thus ensure the oil suction amount.

[0029] A further improvement is that the valve pieces 21 are distributed in a circumferential annular array along the oil suction port 12 .

[0030] Specifically, in the present invention, the valve valve 2 includes four valve pieces 21 distributed in an annular array, and the negative pressure attraction and oil pressure on the four valve pieces 21 are basically uniform by adopting the annular array distribution method, thereby ensuring that the deformation degree of the four valve pieces 21 is consistent, and avoiding that some valve pieces 21 are easily damaged due to excessive deformation, so that the four valve pieces 21 are uniformly stressed, and the service life of the valve valve 2 is extended. Of course, the number of valve pieces 21 in the valve valve 2 can also be two or other multiple numbers.

[0031] A further improvement is that the two ends of the valve piece 21 are respectively a free end 211 and a fixed end 212, the fixed end 212 is adjacent to the inner wall of the oil suction port 12, the distance between the free end 211 and the oil suction chamber 11 is smaller than the distance between the fixed end 212 and the oil suction chamber 11, and the free end 211 is gradually transitioned to the fixed end 212; more specifically, the side of the valve piece 21 facing away from the oil suction chamber 11 is an oil pressure surface 213, and in the closed state of the valve valve 2, the oil pressure surfaces 213 of each valve piece 21 are located on the same spherical surface.

[0032] like Figure 5 and Figure 6 As shown, the fixed ends 212 of the four valve pieces 21 of the valve valve 2 are integrally connected and fixedly connected to the circumferential inner wall of the valve tube 22. The valve piece 21 is in the shape of a thin sheet, and its oil pressure surface 213 and the other surface are respectively located on two spherical surfaces. In order to conveniently distinguish the two surfaces of the valve piece 21 and describe them differently, one surface of the valve piece 21 is the oil pressure surface 213, and the other surface is the negative pressure surface.

[0033] When the oil is sucked, the oil pressure surface 213 is subjected to the pressure from the oil, and the negative pressure surface is subjected to the negative pressure attraction force. The forces of the two forces cause the valve valve 2 to deform elastically, thereby increasing the gap between the four valve pieces 21, opening the oil suction port 12, and facilitating the passage of the oil. After the oil is sucked, the force acting on the valve piece 21 is reduced because the valve piece 21 is separated from the oil and the negative pressure device stops running. The valve piece 21 restores its original shape by its own elasticity, so that the oil pressure surface 213 and the negative pressure surface of the four valve pieces 21 are respectively located on two spherical surfaces, ensuring the sealing connection between the four valve pieces 21, thereby closing the negative pressure port 13. Since the two surfaces of the valve piece 21 are located on the two spherical surfaces, the valve piece 21 is prevented from bulging outward toward the side away from the oil suction chamber 11, thereby ensuring that the valve piece 21 can restore the original shape to ensure the sealing connection between the valve pieces 21.

[0034] A further improvement is that the oil suction ports 12 are densely distributed on at least two of the bottom and top surfaces, the bottom surface, and the circumferential outer edge of the oil suction shell 1. Specifically, the oil suction ports 12 are densely distributed on the bottom surface and the circumferential outer edge of the oil suction shell 1, so that adjacent oil suction ports 12 are close to each other, and when sucking oil, more oil suction ports 12 and valve valves 2 can be guaranteed to contact with the oil, increasing the contact area with the oil, which is beneficial to improving the oil suction efficiency.

[0035] Based on the zero air mixing oil suction assembly of this embodiment, the present invention also discloses a hydraulic oil tank, including an oil storage tank and the above-mentioned zero air mixing oil suction assembly, the oil suction port 12 of the zero air mixing oil suction assembly is located in the oil storage tank, so that after the negative pressure device is started, the hydraulic oil in the oil storage tank is transmitted through the oil suction shell 1 through the oil suction port 12.

[0036] In the hydraulic oil tank, the oil storage tank is used to store hydraulic oil. When the hydraulic oil is not needed, the oil suction shell 1 and the valve valve 2 are separated from the hydraulic oil. At this time, the valve sheets 21 in the valve valve 2 are sealed and connected, and the gap between adjacent valve sheets 21 is zero, so that the oil suction port 12 can be blocked.

[0037] When the mechanical device needs to use hydraulic oil, the oil suction shell 1 is moved downward so that the valve valve 2 at part of the oil suction port 12 contacts the hydraulic oil, and a negative pressure device such as a negative pressure pump is started at the same time. After the valve valve 2 is subjected to the oil pressure of the hydraulic oil, it deforms toward the oil suction chamber 11, and the gap of the valve piece 21 in the valve valve 2 increases, and the gap is filled with hydraulic oil, so that after the negative pressure device is started, the negative pressure generated in the oil suction chamber 11 can absorb the hydraulic oil filled in the gap, and the hydraulic oil flows along the negative pressure pipe 3 to the negative pressure device that needs to use the hydraulic oil; and when there is no hydraulic oil in the gap or other oil suction ports 12 that are not in contact with the hydraulic oil, the valve piece 21 is not subjected to the oil pressure, so that the elastically deformed valve piece 21 can restore its initial position and shape, that is, the valve pieces 21 are sealed and connected to each other, and the gap is zero, which can block the oil suction port 12, thereby preventing air from entering the oil suction chamber 11 and mixing with the hydraulic oil, and finally affecting the normal use of other mechanical devices.

[0038] Moreover, the oil suction ports 12 are densely distributed on the bottom surface and the circumferential outer edge of the oil suction shell 1, increasing the number of the oil suction ports 12 so that when the oil is sucked by negative pressure, more oil suction ports 12 are in contact with the hydraulic oil, thereby increasing the contact area and improving the oil suction efficiency.

[0039] Second embodiment

[0040] like Figure 7 and Figure 8 As shown, a zero air mixing oil suction assembly according to the second embodiment of the present invention is based on the first embodiment, and the difference is that the top surface, the bottom surface and the circumferential outer edge of the oil suction shell 1 are all provided with oil suction ports 12.

[0041] After adopting the above design, when the device absorbs oil, the hydraulic oil can contact the oil suction port 12 on the top surface, bottom surface and circumferential outer edge of the oil suction shell 1, and act on the valve valve 2 to open the valve plate 21. In this way, the hydraulic oil can enter the oil suction chamber 11 from the oil suction port 12 on the top surface, bottom surface and circumferential outer edge of the oil suction shell 1, and then be discharged through the negative pressure port 13. In this way, the area of ​​the oil suction shell 1 absorbing the hydraulic oil is increased, thereby further improving the oil suction efficiency.

[0042] A further improvement is that the oil suction shell 1 is flat.

[0043] After adopting the above design, the overall thickness of the oil suction shell 1 is reduced, so that when sucking oil, it is beneficial for the top surface of the oil suction shell 1 to be immersed below the hydraulic oil level, so as to ensure that part of the hydraulic oil can enter the oil suction cavity 11 through the oil suction port 12 on the top surface and the circumferential outer edge of the oil suction shell 1, so as to improve the oil suction efficiency.

[0044] As a further improvement, an oil seepage through hole 14 is provided on the oil absorption shell 1, and two ends of the oil seepage through hole 14 extend to the top surface and the bottom surface of the oil absorption shell 1 respectively.

[0045] Specifically, the oil suction shell 1 in the present embodiment is an annular structure, and the oil seepage hole 14 is located between the negative pressure port 13 and the circumferential outer edge of the oil suction shell 1. After adopting this structure, the weight of the oil suction shell 1 is reduced. When absorbing oil, the hydraulic oil can not only flow upward from the outside of the oil suction shell 1 to the top surface of the oil suction shell 1, but also flow to the top surface of the oil suction shell 1 through the oil seepage hole 14, so that the hydraulic oil on the top surface of the oil suction shell 1 can enter the oil suction cavity 11 through the oil suction port 12 at the top position of the oil suction shell 1, thereby accelerating the absorption of the hydraulic oil.

[0046] Third embodiment

[0047] like Figure 9-12 As shown, a zero air mixing oil absorption assembly according to the third embodiment of the present invention is based on the second embodiment, with the difference that the valve valve 2 further includes a limiter 23, which is used to limit the deformation degree of the valve sheet 21 so as to limit the size of the gap enclosed by the valve sheet 21.

[0048] After adopting the above design, the deformation degree of the valve plate 21 can be limited by the limit member 23 on the valve valve 2, so as to prevent the oil suction shell 1 from extending into a deep position below the hydraulic oil level, resulting in excessive oil pressure on the valve plate 21, causing the valve plate 21 to deform to a large extent, and the deformation degree exceeds the maximum degree that the valve plate 21 itself can withstand, eventually causing the valve plate 21 to be damaged and unable to return to its initial shape position. At the same time, after limiting the deformation degree of the valve plate 21, the limit member 23 can also limit the gap size of the valve plate 21 to avoid excessive size, which makes it easy for some larger-sized particles to mix into the oil, affecting the sealing degree of the valve plate 21 when it recovers from deformation.

[0049] Specifically, the limiting member 23 is disposed on a side of the valve sheet 21 adjacent to the oil suction chamber 11 , and the limiting member 23 is an elastic limiting member 23 .

[0050] As shown in the figure, the limit member 23 is fixedly connected to the bracket 231, and the bracket 231 is fixed on the circumferential inner wall of the valve tube 22. The limit member 23 is arranged in a one-to-one correspondence with the valve piece 21. The limit member 23 is a limit convex column, and its end adjacent to the corresponding valve piece 21 is hemispherical. The limit member 23 is made of elastic material, and the elastic material includes but is not limited to rubber, silicone, latex, etc.

[0051] After adopting the above structure, the stopper 23 is fixed to the inner side of the valve tube 22 and faces the valve sheet 21 by using the bracket 231. After the valve sheet 21 is subjected to the oil pressure and negative pressure, the valve sheet 21 is deformed toward the stopper 23, and its negative pressure surface acts on the hemispherical end of the stopper 23. The hemispherical end of the stopper 23 is used to auxiliary support the valve sheet 21, offset the oil pressure and negative pressure, and prevent the valve sheet 21 from deforming too much. In addition, since the end of the stopper 23 away from the bracket 231 is hemispherical and the stopper 231 is The valve sheet 21 has elasticity. As the oil pressure and negative pressure force increase, the deformation degree of the valve sheet 21 increases and abuts against the end of the stopper 23. The stopper 23 also undergoes elastic deformation and changes from point contact with the valve sheet 21 to surface contact. As the oil pressure and negative pressure force increase, the deformation degree of the end of the stopper 23 increases, and the contact area between the valve sheet 21 and the stopper 23 increases, thereby avoiding local force on the valve sheet 21. Through surface contact, the force pressure is reduced, and stable support for the valve sheet 21 is achieved.

[0052] In a natural state, there is a gap between the valve piece 21 and the limiting member 23 to ensure that the valve piece 21 can be elastically deformed after being subjected to the oil pressure and the negative pressure attraction, so that the oil suction port 12 is opened.

[0053] After the oil is sucked, the valve piece 21 is separated from the oil, and the negative pressure device stops running, so that the valve piece 21 returns to its original shape, and the valve pieces 21 are sealed and connected, so that the oil suction port 12 is closed.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A zero air mixing oil absorption component, characterized in that: include: An oil suction shell (1), wherein the inner cavity of the oil suction shell (1) is an oil suction cavity (11), and at least two of the top surface, the bottom surface and the circumferential outer edge of the oil suction shell (1) are provided with oil suction ports (12), and the oil suction shell (1) is also provided with a negative pressure port (13) for connecting to a negative pressure device, and the oil suction port (12) and the negative pressure port (13) are both in communication with the oil suction cavity (11); A valve valve (2), the valve valve (2) being connected to the oil suction port (12) in a one-to-one correspondence, the valve valve (2) comprising at least two elastic valve sheets (21), the size of a gap formed by the valve sheets (21) being positively correlated with the oil pressure to which the valve valve (2) is subjected and the minimum value is zero, so as to close the oil suction port (12).

2. The zero air mixing oil absorption assembly according to claim 1, characterized in that: The valve sheets (21) are distributed in a circumferential annular array along the oil suction port (12).

3. The zero air mixing oil absorption assembly according to claim 1, characterized in that: The two ends of the valve sheet (21) are respectively a free end (211) and a fixed end (212); the fixed end (212) is closely adjacent to the inner wall of the oil suction port (12); the distance between the free end (211) and the oil suction cavity (11) is smaller than the distance between the fixed end (212) and the oil suction cavity (11); and the free end (211) is arranged to transition gradually toward the fixed end (212).

4. The zero air mixing oil absorption assembly according to claim 3, characterized in that: The side of the valve sheet (21) facing away from the oil suction chamber (11) is an oil pressure surface (213); in the valve valve (2) in a closed state, the oil pressure surfaces (213) of each valve sheet (21) are located on the same spherical surface.

5. The zero air mixing oil absorption assembly according to claim 1, characterized in that: The oil suction ports (12) are densely distributed on at least two of the top surface, the bottom surface and the circumferential outer edge of the oil suction shell (1).

6. The zero air mixing oil absorption assembly according to claim 5, characterized in that: The top surface, the bottom surface and the circumferential outer edge of the oil suction shell (1) are all provided with oil suction ports (12).

7. The zero air mixing oil absorption assembly according to claim 6, characterized in that: The oil absorption shell (1) is flat.

8. The zero air mixing oil absorption assembly according to claim 7, characterized in that: An oil seepage through hole (14) is provided on the oil absorption shell (1), and two ends of the oil seepage through hole (14) extend to the top surface and the bottom surface of the oil absorption shell (1) respectively.

9. The zero air mixing oil absorption assembly according to claim 1, characterized in that: The valve valve (2) further comprises a limiting member (23), wherein the limiting member (23) is used to limit the degree of deformation of the valve sheet (21) so as to limit the size of a gap enclosed by the valve sheet (21); the limiting member (23) is arranged on a side of the valve sheet (21) adjacent to the oil suction chamber (11), and the limiting member (23) is an elastic limiting member (23).

10. A hydraulic oil tank, characterized in that: It comprises an oil storage tank and a zero air mixing oil suction assembly as claimed in any one of claims 1 to 9, wherein the oil suction port (12) of the zero air mixing oil suction assembly is located in the oil storage tank so that after the negative pressure device is started, the hydraulic oil in the oil storage tank is transmitted through the oil suction shell (1) through the oil suction port (12).

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