Sealing ring and hydraulic oil cylinder

Abstract

The utility model discloses a sealing ring and a hydraulic oil cylinder, the sealing ring comprises: a sealing lip, which is provided with a plurality of outer sealing parts and a plurality of inner sealing parts, the outer sealing parts are formed on the outer surface of the sealing lip, and the inner sealing parts are formed on the inner surface of the sealing lip; the dustproof lip is provided with a first end and a second end, the first end of the dustproof lip is connected with the end of the sealing lip in a splicing mode, the second end of the dustproof lip is suspended, the inner surface of the dustproof lip and the inner surface of the sealing lip are located on the same plane, or the inner surface of the dustproof lip is closer to the axis of the sealing ring than the inner surface of the sealing lip. Compared with the prior art, the sealing ring is arranged to be of a combined structure of the sealing lip and the dustproof lip, when the piston rod reciprocates, the dustproof lip is elastically and tightly attached and contacted with the surface of the piston rod, dirt on the surface of the piston rod can be effectively scraped, and external impurities are prevented from invading.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil cylinder sealing components, in particular to a sealing ring and a hydraulic oil cylinder. Background Art

[0002] At present, the hydraulic cylinder equipped on the hydraulic sluice in water conservancy projects drives the dam surface to rotate from 180 degrees horizontally to 79 degrees. During operation, the piston rod is subjected to a large radial force, which aggravates the wear of the guide mechanism and the sealing mechanism. The uneven force on the piston rod causes the wear on one side of the guide mechanism to increase, resulting in a gap between the piston rod and the guide structure. The hydraulic cylinder works underwater. Because the river water contains mud, sand, scale and other solid particles to varying degrees, the dust on the piston rod will enter the hydraulic cylinder body, causing the stability and service life of the hydraulic cylinder sealing device. The internal structure of the hydraulic cylinder is complex, and the hydraulic cylinder needs to be disassembled to replace the dustproof sealing ring. Frequent disassembly will cause damage to the machinery. Therefore, how to improve and reduce the possibility of external dust entering the cylinder body has become a technical problem that needs to be solved. Utility Model Content

[0003] The purpose of the utility model is to provide a sealing ring and a hydraulic oil cylinder to solve the technical problems in the prior art, and the sealing ring can prevent the invasion of external impurities.

[0004] The utility model provides a sealing ring, comprising:

[0005] A sealing lip having a plurality of outer sealing portions and a plurality of inner sealing portions, wherein the outer sealing portions are formed on an outer surface of the sealing lip and the inner sealing portions are formed on an inner surface of the sealing lip;

[0006] The dust lip has a first end and a second end, the first end of the dust lip is continuous with the end of the sealing lip, the second end of the dust lip is suspended, the inner surface of the dust lip and the inner surface of the sealing lip are in the same plane, or the inner surface of the dust lip is closer to the axis of the sealing ring than the inner surface of the sealing lip.

[0007] In the sealing ring as described above, preferably, the dust lip has a first oil storage portion, and the first oil storage portion is an annular groove formed in the inner surface of the dust lip.

[0008] In the sealing ring as described above, preferably, the outer sealing portion is an annular protrusion protruding from the outer surface of the sealing lip.

[0009] In the sealing ring as described above, preferably, the inner sealing portion includes an annular groove recessed in the inner surface of the sealing lip and an annular sealing ring disposed in the annular groove.

[0010] In the sealing ring as described above, preferably, a second oil storage portion is formed between the two adjacent inner sealing portions, and the second oil storage portion is an annular groove recessed in the inner surface of the sealing lip.

[0011] In the sealing ring as described above, preferably, in the axial direction of the sealing ring, the multiple inner sealing parts correspond to the multiple outer sealing parts one by one.

[0012] In the sealing ring as described above, preferably, two outer sealing parts and two inner sealing parts are provided, and in the axial direction of the sealing ring, the two inner sealing parts correspond to the two outer sealing parts one by one.

[0013] In the sealing ring as described above, preferably, a guiding slope is formed on the outer surface of the dust lip, and an extending direction of the guiding slope intersects with the axial direction of the sealing ring.

[0014] In the second aspect, the utility model provides a hydraulic cylinder, comprising a cylinder body, a cylinder head, a piston rod and a sealing ring, wherein the sealing ring is the aforementioned sealing ring, the cylinder head is fixed on the cylinder body, the piston rod is at least partially accommodated in the cylinder body, the sealing ring is sleeved on the piston rod, the inner surface of the dust lip is in contact with the outer surface of the piston rod, the inner sealing portion forms a sealing fit with the outer surface of the piston rod, and the outer sealing portion forms a sealing fit with the inner surface of the cylinder head.

[0015] A hydraulic cylinder as described above, wherein preferably, the inner surface of the cylinder head is recessed with a sealing groove, the outer sealing portion extends into the sealing groove, and the outer contour surface of the outer sealing portion is adapted to the inner contour surface of the sealing groove.

[0016] Compared with the prior art, the present invention provides a sealing ring as a combination structure of a sealing lip and a dustproof lip. When the piston rod reciprocates, the dustproof lip and the surface of the piston rod are in elastic and tight contact, which can effectively scrape off dirt on the surface of the piston rod and prevent the intrusion of external impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional diagram of the overall structure of the sealing ring provided by an embodiment of the utility model;

[0018] Figure 2 This is a partial cross-sectional view of the overall structure of the sealing ring provided by an embodiment of the present utility model;

[0019] Figure 3 It is a cross-sectional view of the hydraulic cylinder provided by an embodiment of the utility model;

[0020] Figure 4 yes Figure 3 A is an enlarged structural diagram of FIG.

[0021] Description of reference numerals:

[0022] 10-sealing ring, 11-sealing lip, 111-external sealing part, 112-inner sealing part, 113-second oil storage part, 12-dust lip, 121-first oil storage part, 122-guide slope;

[0023] 20-hydraulic cylinder, 21-cylinder body, 22-cylinder head, 221-sealing groove, 23-piston rod. DETAILED DESCRIPTION

[0024] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] [Structure of sealing ring 10]

[0026] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a sealing ring 10. The sealing ring 10 is annular in structure and includes a sealing lip 11 and a dust lip 12. The sealing lip 11 and the dust lip 12 are preferably integrally formed, so that they are not only structurally stable and have a strong load-bearing capacity, but also have excellent resilience, wear resistance and extrusion resistance. The sealing ring 10 can be made of polyurethane, rubber, or other materials with a certain elasticity. It can be deformed when subjected to external pressure and can return to its original shape after the external force is removed.

[0027] Reference Figure 2 As shown, the sealing lip 11 has a plurality of outer sealing portions 111 and a plurality of inner sealing portions 112. The outer sealing portions 111 are formed on the outer surface of the sealing lip 11, and the inner sealing portions 112 are formed on the inner surface of the sealing lip 11. Taking the sealing ring 10 applied to the hydraulic cylinder 20 as an example, refer to Figure 3 As shown, the hydraulic cylinder 20 includes a cylinder body 21, a piston (not shown), a piston rod 23 and other parts. A cylinder cavity is formed in the cylinder body 21, and one end of the piston rod 23 is connected to the piston, driving the piston to move in the cylinder cavity. The sealing ring 10 is installed in the cylinder body 21, and the outer sealing part 111 is in sealing contact with the cylinder body 21, and the inner sealing part 112 is in sealing contact with the piston rod 23, so that the cylinder cavity is in a sealed state. By providing multiple outer sealing parts 111 and multiple inner sealing parts 112, the elasticity and deformation space of the sealing ring 10 are increased, and at the same time, the contact surface between the sealing ring 10 and the piston rod 23 is increased, forming a multi-faceted sealing effect.

[0028] The dust lip 12 has a first end and a second end. The first end of the dust lip 12 is connected to the end of the sealing lip 11, and the second end of the dust lip 12 is suspended. The inner surface of the dust lip 12 and the inner surface of the sealing lip 11 are in the same plane, or the inner surface of the dust lip 12 is closer to the axis of the sealing ring 10 than the inner surface of the sealing lip 11. Taking the sealing ring 10 applied to the hydraulic cylinder 20 as an example, the inner surface of the dust lip 12 will be in close contact with the piston rod 23. During the reciprocating movement of the piston rod 23, since the second end of the dust lip 12 is suspended, the second end of the dust lip 12 will move accordingly, effectively scraping off the dirt on the surface of the piston rod 23 and preventing external impurities from invading.

[0029] Further, refer to Figure 2 As shown, the dust lip 12 has a first oil storage portion 121. The first oil storage portion 121 is an annular groove formed in the inner surface of the dust lip 12. The depth of the annular groove can be determined according to actual conditions and is not limited here. A certain amount of lubricating oil can be stored in the annular groove. After the sealing ring 10 is sleeved on the piston rod 23, a sealed space is formed between the inner surface of the annular groove and the outer surface of the piston rod 23. The lubricating oil can provide lubrication to the piston rod 23 on the one hand, and enhance the dust removal effect on the other hand. Dust and impurities can be accommodated in this sealed space, reducing the possibility of external dust entering the cylinder body.

[0030] In the embodiments provided by the present utility model, Figure 2 As shown, the outer sealing portion 111 is an annular protrusion convexly provided on the outer surface of the sealing lip 11. This annular protrusion is an energy storage elastomer. The outer sealing portion 111 is used to form a sealing fit with the sealing groove 221 provided inside the cylinder body. In a feasible implementation manner, the cross-section of the sealing groove 221 is a square structure, and the cross-section of the outer sealing portion 111 is also a shape that matches therewith. The outer surface of the outer sealing portion 111 fits with the inner surface of the sealing groove 221, and the contact surface between the outer sealing portion 111 and the sealing groove 221 is large, so the contact is relatively stable.

[0031] Because the outer sealing portion 111 is an energy-storing elastomer, when the piston rod 23 moves sideways, the outer sealing portion 111 is squeezed out of one side of the sealing groove 221 by the pressure of the pressurized liquid. The outer sealing portion 111 generates an elastic force due to the compression, and the elastic force is transmitted to the dust lip 12, so that the inner surface of the dust lip 12 can move closely with the piston rod 23 at any time, thereby better ensuring the support force and stability of the sealing ring 10 under high-pressure and high-speed operation.

[0032] In the embodiment provided by the present invention, the inner sealing portion 112 includes an annular groove formed in the inner surface of the sealing lip 11 and an annular sealing ring arranged in the annular groove. The annular sealing ring is squeezed and deformed by the outer surface of the piston rod 23, thereby achieving a sealing effect.

[0033] Further, refer to Figure 2 As shown, a second oil storage portion 113 is formed between two adjacent inner sealing portions 112. The second oil storage portion 113 is an annular groove recessed in the inner surface of the sealing lip 11. The depth of the annular groove can be determined according to actual conditions and is not limited here. A certain amount of lubricating oil can be stored in the annular groove. After the sealing ring 10 is sleeved on the piston rod 23, a sealed space is formed between the inner surface of the annular groove and the outer surface of the piston rod 23, so that the inner surface of the sealing lip 11 can maintain a lubricated state for a longer time, which can effectively reduce the wear of the sealing lip 11 and increase the service life of the sealing ring 10.

[0034] The second oil storage portion 113 is arranged between the two inner sealing portions 112. The inner sealing portion 112 can play a certain supporting role to avoid the internal space generated by the second oil storage portion 113 causing the sealing ring 10 to be easily deformed, and can also reduce the situation where the sealing lip 11 is subjected to pressure and the lubricating oil stored in the second oil storage portion 113 is squeezed out.

[0035] In a feasible implementation, referring to Figure 2 As shown, in the axial direction of the sealing ring 10, multiple inner sealing parts 112 correspond one-to-one with multiple outer sealing parts 111. During the reciprocating movement of the piston rod 23, the force applied to the sealing ring 10 mainly acts on the inner sealing parts 112. By making the outer sealing parts 111 and the inner sealing parts 112 correspond one-to-one, the structural strength of the main force-bearing parts of the sealing ring 10 is enhanced, the sealing performance is improved, and the sealing ring 10 is not easy to be skewed.

[0036] Preferably, there are two outer sealing parts 111 and two inner sealing parts 112. In the axial direction of the sealing ring 10, the two inner sealing parts 112 correspond one-to-one to the two outer sealing parts 111, which not only strengthens the structure of the sealing lip 11 but also plays a double sealing role, and has a better sealing, waterproof and dustproof effect.

[0037] Reference Figure 2 as well as Figure 4 As shown, a guiding slope 122 is formed on the outer surface of the dust lip 12, and the extending direction of the guiding slope 122 intersects with the axial direction of the sealing ring 10. After the sealing ring 10 is assembled into the cylinder body 21, the dust lip 12 is driven to move during the movement of the piston rod 23. Since the guiding slope 122 is formed on the outer surface of the dust lip 12, the guiding slope 122 can abut against the components on the cylinder body 21. The guiding slope 122 decomposes the force generated during the abutment process and squeezes the dust lip 12 toward one end of the piston rod 23, so that the dust lip 12 can maintain close contact with the piston rod 23, more effectively scraping off the dirt on the surface of the piston rod 23, and preventing external impurities from invading.

[0038] [Structure of the hydraulic cylinder 20]

[0039] Based on the sealing ring 10 provided in the above embodiment, the present invention further provides a hydraulic cylinder 20, such as Figure 3 and Figure 4 As shown, the hydraulic cylinder 20 includes a cylinder body 21, a cylinder head 22, a piston rod 23 and a sealing ring 10. The sealing ring 10 is the aforementioned sealing ring 10. The cylinder head 22 is fixed to the cylinder body 21. The piston rod 23 is at least partially accommodated in the cylinder body 21. The sealing ring 10 is sleeved on the piston rod 23. The inner surface of the dust lip 12 is in contact with the outer surface of the piston rod 23. The inner sealing portion 112 forms a sealing fit with the outer surface of the piston rod 23. The outer sealing portion 111 forms a sealing fit with the inner surface of the cylinder head 22.

[0040] By configuring the sealing ring 10 as a combination structure of the sealing lip 11 and the dust lip 12, when the piston rod 23 reciprocates, the dust lip 12 elastically and tightly contacts the surface of the piston rod 23, which can effectively scrape off dirt on the surface of the piston rod 23 and prevent the intrusion of external impurities.

[0041] Furthermore, a sealing groove 221 is recessed on the inner surface of the cylinder head 22 , and the outer sealing portion 111 extends into the sealing groove 221 . The outer contour surface of the outer sealing portion 111 is adapted to the inner contour surface of the sealing groove 221 .

[0042] In a feasible embodiment, the cross-section of the sealing groove 221 is a square structure, and the cross-section of the outer sealing part 111 is also a shape that matches it. The outer surface of the outer sealing part 111 fits the inner surface of the sealing groove 221, and the contact surface between the outer sealing part 111 and the sealing groove 221 is large, so the contact is relatively stable.

[0043] Since the outer sealing portion 111 is an energy-storing elastomer, when the piston rod 23 moves sideways, the outer sealing portion 111 is squeezed out of one side of the sealing groove 221 by the pressure of the pressurized liquid. The outer sealing portion 111 generates an elastic force due to the compression, and the elastic force is transmitted to the dust lip 12, so that the inner surface of the dust lip 12 can move closely against the piston rod 23 at any time, thereby better ensuring the support force and stability of the sealing ring 10 under high-pressure and high-speed operation.

[0044] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A sealing ring, characterized in that: include: A sealing lip having a plurality of outer sealing portions and a plurality of inner sealing portions, wherein the outer sealing portions are formed on an outer surface of the sealing lip and the inner sealing portions are formed on an inner surface of the sealing lip; The dust lip has a first end and a second end, the first end of the dust lip is continuous with the end of the sealing lip, the second end of the dust lip is suspended, the inner surface of the dust lip and the inner surface of the sealing lip are in the same plane, or the inner surface of the dust lip is closer to the axis of the sealing ring than the inner surface of the sealing lip.

2. The sealing ring according to claim 1, characterized in that: The dust lip has a first oil storage portion, which is an annular groove recessed in the inner surface of the dust lip.

3. The sealing ring according to claim 1, characterized in that: The outer sealing portion is an annular protrusion convexly provided on the outer surface of the sealing lip.

4. The sealing ring according to claim 1, characterized in that: The inner sealing portion includes an annular groove recessed in the inner surface of the sealing lip and an annular sealing ring disposed in the annular groove.

5. The sealing ring according to claim 1, characterized in that: A second oil storage portion is formed between the two adjacent inner sealing portions. The second oil storage portion is an annular groove recessed in the inner surface of the sealing lip.

6. The sealing ring according to claim 1, characterized in that: In the axial direction of the sealing ring, the plurality of inner sealing parts correspond to the plurality of outer sealing parts one by one.

7. The sealing ring according to claim 6, characterized in that: There are two outer sealing parts and two inner sealing parts. In the axial direction of the sealing ring, the two inner sealing parts correspond to the two outer sealing parts one by one.

8. The sealing ring according to claim 1, characterized in that: A guiding slope is formed on the outer surface of the dust lip, and an extending direction of the guiding slope intersects with the axial direction of the sealing ring.

9. A hydraulic cylinder, characterized in that: It includes a cylinder body, a cylinder head, a piston rod and a sealing ring, the sealing ring is the sealing ring according to any one of claims 1 to 8, the cylinder head is fixed to the cylinder body, the piston rod is at least partially accommodated in the cylinder body, the sealing ring is sleeved on the piston rod, the inner surface of the dust lip is in contact with the outer surface of the piston rod, the inner sealing part forms a sealing fit with the outer surface of the piston rod, and the outer sealing part forms a sealing fit with the inner surface of the cylinder head.

10. The hydraulic cylinder according to claim 9, characterized in that: The inner surface of the oil cylinder cover is recessed to form a sealing groove, the outer sealing portion extends into the sealing groove, and the outer contour surface of the outer sealing portion is adapted to the inner contour surface of the sealing groove.

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