A seal ring against extrusion leakage

Abstract

The utility model discloses a kind of sealing rings of anti-extrusion leakage, belong to sealing ring technical field.A kind of sealing ring of anti-extrusion leakage, including the first lip and second lip of being arranged in sealing ring body top, the first lip, second lip and the section of sealing ring body are Y-shaped, recess is opened in the top of sealing ring body, the recess is located between the first lip and second lip, step groove is opened in the bottom of sealing ring body, protection ring is sleeved in the step groove inside;The utility model is through setting protection ring, when installing sealing ring body, protection ring lower surface is in contact with the bottom of sealing groove, because the hardness of nylon is greater than the hardness of polyurethane, therefore, when oil pressure promotes sealing ring body deformation, it is blocked by protection ring, can effectively prevent sealing ring body deformation and extrude into the gap between piston rod and piston sleeve, avoid the leakage of damage.

Description

Technical Field

[0001] This utility model relates to the field of sealing ring technology, and in particular to a sealing ring that prevents extrusion leakage. Background Technology

[0002] As a core actuator in engineering machinery, the sealing reliability of hydraulic cylinders directly determines the overall working efficiency, service life, and environmental pollution control of the machine. In hydraulic cylinders, dynamic seals (mainly including bore seals and rod seals) are key components preventing internal and external leakage of pressurized hydraulic fluid.

[0003] Currently, the industry commonly uses sealing rings based on elastomer materials such as polyurethane or nitrile rubber, which exhibit good sealing performance under normal working conditions. However, in actual engineering applications, especially under harsh working conditions with variable loads and frequent movements, hydraulic systems can generate instantaneous high-pressure shocks far exceeding the rated working pressure. When high-pressure oil acts on the sealing ring, it forces the relatively soft sealing ring material to plastically flow towards the side with the fitting clearance (i.e., between the piston and cylinder, or between the piston rod and the guide sleeve). The sealing ring material squeezed into the narrow gap cannot effectively rebound when the pressure drops suddenly or the piston rod moves, and is subsequently sheared and destroyed by the metal edge, forming permanent defects and easily leading to serious leakage problems. Utility Model Content

[0004] The purpose of this invention is to solve the problem of defective sealing rings in the prior art, and to propose a sealing ring that prevents extrusion leakage.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A sealing ring for preventing extrusion leakage includes a first lip and a second lip disposed on the top of the sealing ring body. The first lip, the second lip and the cross section of the sealing ring body are Y-shaped. A groove is formed on the top of the sealing ring body between the first lip and the second lip. A stepped groove is formed on the bottom of the sealing ring body, and a protective ring is fitted inside the stepped groove.

[0006] In some embodiments, the first lip is located inside the sealing ring body, the second lip is located outside the sealing ring body, and the length of the first lip is greater than the length of the second lip.

[0007] In some embodiments, the surface of the stepped groove is provided with a slot, the surface of the protective ring is fixed with a plug ring that mates with the slot, and the top of the plug ring is provided with a protruding ring.

[0008] In some embodiments, the stepped groove and the protective ring are both located on the outer surface of the sealing ring body.

[0009] In some embodiments, the sealing ring body is preferably made of polyurethane.

[0010] In some embodiments, the protective ring is preferably made of nylon.

[0011] In some embodiments, the first lip is located inside the sealing ring body, the second lip is located outside the sealing ring body, and the length of the first lip is less than the length of the second lip.

[0012] In some embodiments, the stepped groove and the protective ring are both located inside the sealing ring body.

[0013] Compared with the prior art, the present invention provides a sealing ring that prevents extrusion leakage, which has the following beneficial effects.

[0014] 1. In this utility model, by setting a protective ring, when the sealing ring body is installed, the lower surface of the protective ring abuts against the bottom of the sealing groove. Since the hardness of nylon is greater than that of polyurethane, when the oil pressure pushes the sealing ring body to deform, the protective ring can effectively prevent the sealing ring body from deforming and squeezing into the gap between the piston rod and the piston sleeve, thus avoiding damage and leakage.

[0015] 2. This utility model provides a first lip, a second lip, and a groove on the top of the sealing ring body. The first lip and the second lip respectively abut against the surface of the piston rod and the inside of the piston sleeve, allowing hydraulic oil to enter the groove and generate sealing pressure. The oil pressure pushes the first lip and the second lip to press tightly against the surface of the piston rod and the inside of the piston sleeve, thereby sealing the gap. Within a certain range, the higher the oil pressure, the better the sealing effect.

[0016] Other advantages, objectives and features of this invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be taught from practice of this invention. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural diagram of Embodiment 1 of the present invention.

[0018] Figure 2 This is a cross-sectional structural diagram of Embodiment 1 of the present invention with the protective ring removed.

[0019] Figure 3 This utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0020] Figure 4 This is a schematic diagram of the usage state structure of Embodiment 1 of this utility model.

[0021] Figure 5 This is a cross-sectional structural diagram of Embodiment 2 of this utility model.

[0022] Figure 6 This is a cross-sectional structural diagram of Embodiment 2 of the present invention with the protective ring removed.

[0023] Figure 7 This is a schematic diagram of the usage state structure of Embodiment 2 of this utility model.

[0024] Figure 8 A schematic diagram of the structure in use before the protective ring is installed on the sealing ring.

[0025] In the picture: 1. Sealing ring body; 101. Groove; 2. First lip; 3. Second lip; 4. Step groove; 401. Slot; 5. Protective ring; 501. Insert ring; 6. Piston rod; 7. Piston sleeve. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Example 1: Reference Figure 1-4 A sealing ring for preventing extrusion leakage includes a first lip 2 and a second lip 3 disposed on the top of the sealing ring body 1. The first lip 2 and the second lip 3 form a Y-shape with the cross section of the sealing ring body 1. A groove 101 is provided on the top of the sealing ring body 1, and the groove 101 is located between the first lip 2 and the second lip 3. The sealing ring body 1 is made of polyurethane or rubber, preferably polyurethane. The first lip 2 is located inside the sealing ring body 1, and the second lip 3 is located outside the sealing ring body 1. The length of the first lip 2 is greater than the length of the second lip 3.

[0028] It is understandable that by setting a first lip 2, a second lip 3, and a groove 101 on the top of the sealing ring body 1, when installing the sealing ring body 1, the sealing ring body 1 is placed in the sealing groove, with the groove 101 facing the direction of hydraulic oil outflow. The first lip 2 and the second lip 3 respectively abut against the surface of the piston rod 6 and the inside of the piston sleeve 7. At the same time, the shorter second lip 3 abuts against the inside of the piston sleeve 7, allowing hydraulic oil to enter the groove 101 and generate sealing pressure. When the hydraulic oil flows out, the hydraulic oil enters the groove 101, and the oil pressure pushes the first lip 2 and the second lip 3 to press tightly against the surface of the piston rod 6 and the inside of the piston sleeve 7, thereby sealing the gap. Within a certain range, the higher the oil pressure, the better the sealing effect.

[0029] Specifically, a stepped groove 4 is provided at the bottom of the sealing ring body 1, and a protective ring 5 is fitted inside the stepped groove 4. The lower surface of the protective ring 5 is flush with the lower surface of the sealing ring body 1. The protective ring 5 is made of nylon or polyoxymethylene, preferably nylon. Both the stepped groove 4 and the protective ring 5 are located on the outer surface of the sealing ring body 1.

[0030] Understandably, when the stepped groove 4 and the protective ring 5 are located on the outer surface of the sealing ring body 1, the sealing ring body 1 is installed in the sealing groove on the surface of the piston rod 6 to encapsulate the piston sleeve 7. During the installation of the sealing ring body 1, the lower surface of the protective ring 5 abuts against the bottom of the sealing groove. Because the hardness of nylon is greater than that of polyurethane, when oil pressure pushes the sealing ring body 1 to deform, the protective ring 5 effectively prevents the sealing ring body 1 from deforming and squeezing into the gap between the piston rod 6 and the piston sleeve 7 (see reference). Figure 8 This is to prevent damage and leakage.

[0031] Specifically, a slot 401 is provided on the surface of the stepped groove 4, and an insert ring 501 that mates with the slot 401 is fixed on the surface of the protective ring 5. A protruding ring is provided on the top of the insert ring 501.

[0032] It is understandable that by setting the slot 401 and the insert ring 501, when installing the protective ring 5, the insert ring 501 is inserted into the slot 401. The insert ring 501 is press-fitted with the slot 401 through the convex ring, thereby preventing the protective ring 5 from easily detaching from the surface of the sealing ring body 1.

[0033] Example 2: Reference Figure 5-8 A sealing ring for preventing extrusion leakage, which differs from the above embodiment in that the first lip 2 is located inside the sealing ring body 1 and the second lip 3 is located outside the sealing ring body 1, and the length of the first lip 2 is less than the length of the second lip 3. Both the stepped groove 4 and the protective ring 5 are located inside the sealing ring body 1.

[0034] It is understandable that when the stepped groove 4 and the protective ring 5 are located inside the sealing ring body 1, the sealing ring body 1 is installed in the sealing groove on the inner wall of the piston sleeve 7 to encapsulate the piston rod 6; at the same time, the shorter first lip 2 abuts against the surface of the piston rod 6, allowing hydraulic oil to enter the groove 101 to generate sealing pressure.

[0035] In this invention, the protective ring 5 is fitted inside the stepped groove 4, and the insert ring 501 is inserted into the slot 401. When installing the sealing ring body 1, the sealing ring body 1 is placed in the sealing groove, with the groove 101 facing the direction of hydraulic oil outflow, so that hydraulic oil can enter the groove 101 to generate sealing pressure. When the hydraulic oil flows out, the hydraulic oil enters the groove 101, and the oil pressure pushes the first lip 2 and the second lip 3 to press tightly against the surface of the piston rod 6 and the inside of the piston sleeve 7, thereby sealing the gap. Within a certain range, the higher the oil pressure, the better the sealing effect. Since the hardness of nylon is greater than that of polyurethane, when the oil pressure pushes the sealing ring body 1 to deform, the protective ring 5 can effectively prevent the sealing ring body 1 from deforming and squeezing into the gap between the piston rod 6 and the piston sleeve 7, avoiding damage and leakage.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples; although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A sealing ring to prevent extrusion leakage, characterized in that, It includes a first lip (2) and a second lip (3) set on the top of the sealing ring body (1). The first lip (2) and the second lip (3) are Y-shaped with the sealing ring body (1). A groove (101) is opened on the top of the sealing ring body (1). The groove (101) is located between the first lip (2) and the second lip (3). A stepped groove (4) is opened at the bottom of the sealing ring body (1). A protective ring (5) is fitted inside the stepped groove (4).

2. The sealing ring for preventing extrusion leakage according to claim 1, characterized in that, The first lip (2) is located inside the sealing ring body (1), and the second lip (3) is located outside the sealing ring body (1). The length of the first lip (2) is greater than the length of the second lip (3).

3. The sealing ring for preventing extrusion leakage according to claim 1, characterized in that, The surface of the stepped groove (4) is provided with a slot (401), and the surface of the protective ring (5) is fixed with a plug ring (501) that cooperates with the slot (401). The top of the plug ring (501) is provided with a protruding ring.

4. The sealing ring for preventing extrusion leakage according to claim 1, characterized in that, The stepped groove (4) and the protective ring (5) are both located on the outer surface of the sealing ring body (1).

5. A sealing ring for preventing extrusion leakage according to claim 1, characterized in that, The sealing ring body (1) is made of polyurethane.

6. A sealing ring for preventing extrusion leakage according to claim 1, characterized in that, The protective ring (5) is made of either polyoxymethylene or nylon.

7. A sealing ring for preventing extrusion leakage according to claim 1, characterized in that, The first lip (2) is located inside the sealing ring body (1), and the second lip (3) is located outside the sealing ring body (1). The length of the first lip (2) is less than the length of the second lip (3).

8. A sealing ring for preventing extrusion leakage according to claim 1, characterized in that, The stepped groove (4) and the protective ring (5) are both located inside the sealing ring body (1).

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