Oil leakage prevention type hydraulic oil cylinder

Abstract

The utility model relates to the technical field of hydraulic oil cylinders, in particular to an oil leakage prevention type hydraulic oil cylinder which comprises a cylinder body, a piston rod movably inserted into the inner wall of the cylinder body, a front sealing assembly and a rear sealing assembly. A first oil liquid hole communicated with the inner cavity of the cylinder body is formed in the second flange plate, an oil liquid cavity is formed in the inner wall of the second flange plate, a first sealing ring groove is formed in the outer end of the oil liquid cavity, and a first sealing ring is arranged in the first sealing ring groove; a through hole is formed between the first sealing ring groove and the first oil liquid hole, a one-way valve is arranged in the through hole, and the one-way valve flows from the oil liquid cavity to the first oil liquid hole. A small amount of oil liquid penetrating through a third sealing ring groove is collected into the oil liquid cavity through the second sealing ring and the oil liquid cavity and discharged through the one-way valve, pressure relief is conducted while the oil liquid on the wall of the piston rod is cleaned, the sealing performance of the hydraulic oil cylinder is greatly improved, and the service life is prolonged.

Description

Technical Field

[0001] The present application belongs to the technical field of hydraulic cylinders, and in particular relates to an oil leakage-proof hydraulic cylinder. Background Art

[0002] Hydraulic cylinders are critical components in hydraulic systems, and their sealing performance directly impacts system stability and efficiency. Traditional hydraulic cylinders often leak hydraulic oil during use due to improper sealing structures or aging seals. This not only impacts normal equipment operation but can also cause environmental pollution and waste resources. Therefore, improvements to existing hydraulic cylinder structures are needed to enhance their sealing properties and extend their service life. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to solve the deficiencies in the prior art, thereby providing an oil-leakage-proof hydraulic cylinder to solve the above technical problems.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] An oil-leakage-proof hydraulic cylinder comprises a cylinder body, a piston rod movably plugged into the inner wall of the cylinder body, and a front sealing assembly and a rear sealing assembly respectively located at both ends of the cylinder body and used to seal the cylinder body;

[0006] The front sealing assembly includes a first flange fixedly connected to the end of the cylinder body, a second flange fixedly connected to the first flange, the second flange is provided with a first oil hole communicating with the inner cavity of the cylinder body, an oil cavity is provided on the inner wall of the second flange, a first sealing ring groove is provided at the outer end of the oil cavity, and a first sealing ring is provided in the first sealing ring groove;

[0007] A through hole is provided between the first sealing ring groove and the first oil hole, and a one-way valve is provided in the through hole. The flow direction of the one-way valve is set to flow from the oil cavity to the first oil hole.

[0008] Preferably, in an oil-leakage-proof hydraulic cylinder of the present invention, a second sealing ring groove and a third sealing ring groove are respectively provided on the inner wall of the second flange on both sides of the first sealing ring groove, and sealing rings are provided in the second sealing ring groove and the third sealing ring groove to be in sliding contact with the outer wall of the piston rod.

[0009] Preferably, in the oil-leakage-proof hydraulic cylinder of the present invention, the inner end of the second flange is sleeved on the inner wall of the first flange, and a fourth sealing ring groove for arranging a sealing ring is provided between the second flange and the first flange.

[0010] Preferably, in the oil-leakage-proof hydraulic cylinder of the present invention, a plurality of sealing rings are provided between the piston end of the piston rod and the inner wall of the cylinder body.

[0011] Preferably, in an oil-leakage-proof hydraulic cylinder of the present invention, the rear sealing assembly includes a third flange fixed to the rear end of the cylinder body, and the third flange is provided with a second oil hole communicating with the other end of the inner cavity of the cylinder body.

[0012] Preferably, in the oil-leakage-proof hydraulic cylinder of the present invention, a sealing ring for sealing is provided between the third flange and the inner wall or end of the cylinder body.

[0013] Preferably, in an oil-leakage-proof hydraulic cylinder of the present invention, the outer end of the third flange is further connected to a second earring, the outer end of the piston rod is connected to a first earring, and bearings are provided in both the first earring and the second earring.

[0014] The beneficial effects of the utility model are:

[0015] (1) By setting up the second sealing ring and the oil chamber, a small amount of oil that passes through the third sealing ring groove is collected in the oil chamber and discharged through the one-way valve, thereby cleaning the oil on the piston rod wall and also relieving the pressure;

[0016] (2) The provision of the second and third sealing rings further enhances the oil leakage prevention capability between the piston rod and the contact member, thereby significantly improving the sealing performance of the hydraulic cylinder and increasing its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The technical solution of the present application is further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 Schematic diagram of the cross-sectional structure of an embodiment of the present application;

[0019] Figure 2 yes Figure 1 A in the middle is an enlarged schematic diagram;

[0020] Figure 3 Schematic diagram of the external structure of an embodiment of the present application;

[0021] The reference numerals in the figures are:

[0022] Cylinder body 10, piston rod 11, front sealing assembly 13, rear sealing assembly 14;

[0023] A first flange 131, a second flange 132, and a third flange 141;

[0024] Oil chamber 1321 , first sealing ring groove 1322 , one-way valve 1323 , second sealing ring groove 1324 , third sealing ring groove 1325 , fourth sealing ring groove 1326 . DETAILED DESCRIPTION

[0025] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0028] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0029] Example

[0030] This embodiment provides an oil-leakage-proof hydraulic cylinder, comprising a cylinder body 10, a piston rod 11 movably inserted into the inner wall of the cylinder body 10, and a front sealing assembly 13 and a rear sealing assembly 14 respectively located at both ends of the cylinder body 10 and used to seal the cylinder body. The piston rod 11 includes a piston head and a push rod. The piston head divides the cylinder body 10 into a dynamically changing front hydraulic compartment and a rear hydraulic compartment.

[0031] The front sealing assembly 13 includes a first flange 131 fixedly screwed on the end of the cylinder body, and a second flange 132 fixedly connected to the first flange 131 by bolts. The inner wall of the first flange 131 is sleeved and connected to the inner end of the second flange 132. The inner wall of the second flange 132 is in sliding contact with the piston rod. The second flange 132 is provided with a first oil hole communicating with the inner cavity of the cylinder body 10, and the inner wall of the second flange 132 is provided with an oil cavity 1321. The outer end of the oil cavity 1321 is provided with a first sealing ring groove 1322, and a first sealing ring is provided in the first sealing ring groove; a through hole is provided between the first sealing ring groove 1322 and the first oil hole, and a one-way valve 1323 is provided in the through hole, and the flow direction of the one-way valve 1323 is set to flow from the oil cavity 1321 to the first oil hole.

[0032] Preferably, in an oil-leakage-proof hydraulic cylinder of this embodiment, a second sealing ring groove 1324 and a third sealing ring groove 1325 are respectively provided on the inner wall of the second flange plate 132 on both sides of the first sealing ring groove 1322, and sealing rings are provided in the second sealing ring groove 1324 and the third sealing ring groove 1325 to be in sliding contact with the outer wall of the piston rod 11.

[0033] During actual operation, as the piston rod 11 moves, a small amount of oil in the cylinder body 10 will pass through the V-shaped sealing ring in the second sealing ring groove 1324. Under the action of the Y-shaped sealing ring on the first sealing ring groove 1322, the oil on the piston rod 11 is scraped into the oil chamber 1321. When the piston rod of the hydraulic cylinder extends, the front hydraulic compartment of the cylinder body is depressurized, the oil flows out, and the oil in the oil chamber 1321 flows to the first oil hole through the one-way valve 1323 for discharge.

[0034] The setting of the oil chamber 1321 and the one-way valve 1323 can also reduce the pressure in the gap between the piston rod and the inner wall of the second flange 132. When the pressure is too high, the one-way valve 1323 is used to release the pressure, further preventing the oil from leaking through the first sealing ring groove 1322, the second sealing ring groove 1324 and the piston rod.

[0035] The third sealing ring groove 1325 is located outside the second sealing ring groove 1324 , and a V-shaped sealing ring is installed therein to seal the oil cavity 1321 from the external environment, thereby further preventing leakage of oil in the oil cavity 1321 .

[0036] Preferably, in an oil-leakage-proof hydraulic cylinder of this embodiment, the inner end of the second flange 132 is sleeved on the inner wall of the first flange 131 , and a fourth sealing ring groove 1326 for arranging an O-ring is provided between the second flange 132 and the first flange 131 .

[0037] Preferably, in the oil-leakage-proof hydraulic cylinder of this embodiment, a plurality of V-shaped sealing rings are provided between the piston end of the piston rod 11 and the inner wall of the cylinder body 10 for movably sealing the front hydraulic chamber and the rear hydraulic chamber.

[0038] Preferably, in the oil-leakage-proof hydraulic cylinder of this embodiment, the rear sealing assembly 14 includes a third flange 141 fixed to the rear end of the cylinder body 10 , and the third flange 141 is provided with a second oil hole connected to the other end of the inner cavity of the cylinder body 10 .

[0039] Preferably, in the oil-leakage-proof hydraulic cylinder of this embodiment, an O-ring for sealing is provided between the third flange 141 and the inner wall or end of the cylinder body 10 .

[0040] Preferably, in an oil-leakage-proof hydraulic cylinder of this embodiment, the outer end of the third flange 141 is also connected to a second earring, and the outer end of the piston rod 11 is connected to a first earring. Bearings are provided in the first earring and the second earring to facilitate connection of equipment.

[0041] The working principle of the present invention is: due to the reciprocating action of the piston rod, the oil in the hydraulic cylinder is easy to leak out along the piston rod. Therefore, the oil cylinder structure designed by the present invention, first, the third sealing ring groove 1325 plays the role of preliminarily sealing the oil chamber 1321 and the external environment; by setting the oil chamber 1321 and the one-way valve 1323, a small amount of oil passing through the third sealing ring groove 1325 is collected in the oil chamber 1321. When the piston rod of the hydraulic cylinder is extended, the front hydraulic compartment of the cylinder body is depressurized, and the oil flows out. The oil in the oil chamber 1321 flows to the first oil hole through the one-way valve 1323 for discharge, which plays the role of oil reflux. At the same time, it also reduces the pressure in the gap between the piston rod and the cylinder wall, further reducing the risk of oil leakage; the sealing ring in the third sealing ring groove 1325 strengthens the sealing effect between the cylinder and the external environment.

[0042] Based on the above-mentioned ideal embodiments of this application, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the scope of the technical concept of this application. The technical scope of this application is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An oil-leakage-proof hydraulic cylinder, comprising a cylinder body (10), a piston rod (11) movably plugged into the inner wall of the cylinder body (10), and a front sealing assembly (13) and a rear sealing assembly (14) respectively located at both ends of the cylinder body (10) and used to seal the cylinder body; It is characterized by: The front sealing assembly (13) comprises a first flange (131) fixedly connected to the end of the cylinder body, a second flange (132) fixedly connected to the first flange (131), a first oil hole communicating with the inner cavity of the cylinder body (10) is provided on the second flange (132), an oil cavity (1321) is provided on the inner wall of the second flange (132), a first sealing ring groove (1322) is provided at the outer end of the oil cavity (1321), and a first sealing ring is provided in the first sealing ring groove; A through hole is provided between the first sealing ring groove (1322) and the first oil hole, and a one-way valve (1323) is provided in the through hole. The flow direction of the one-way valve (1323) is set to flow from the oil cavity (1321) to the first oil hole.

2. The anti-leakage hydraulic cylinder according to claim 1, characterized in that: A second sealing ring groove (1324) and a third sealing ring groove (1325) are respectively provided on the inner wall of the second flange (132) on both sides of the first sealing ring groove (1322), and sealing rings are provided in the second sealing ring groove (1324) and the third sealing ring groove (1325) to be in sliding contact with the outer wall of the piston rod (11).

3. The anti-leakage hydraulic cylinder according to claim 2, characterized in that: The inner end of the second flange (132) is sleeved on the inner wall of the first flange (131), and a fourth sealing ring groove (1326) for arranging a sealing ring is provided between the second flange (132) and the first flange (131).

4. The anti-leakage hydraulic cylinder according to claim 3, characterized in that: A plurality of sealing rings are provided between the piston end of the piston rod (11) and the inner wall of the cylinder body (10).

5. The oil-leakage-proof hydraulic cylinder according to any one of claims 1 to 4, characterized in that: The rear sealing assembly (14) comprises a third flange (141) fixed to the rear end of the cylinder body (10), and the third flange (141) is provided with a second oil hole communicating with the other end of the inner cavity of the cylinder body (10).

6. The anti-leakage hydraulic cylinder according to claim 5, characterized in that: A sealing ring is provided between the third flange (141) and the inner wall or end of the cylinder body (10).

7. The anti-leakage hydraulic cylinder according to claim 6, characterized in that: The outer end of the third flange (141) is also connected to a second earring, and the outer end of the piston rod (11) is connected to a first earring, and bearings are provided in both the first earring and the second earring.

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