Zero leakage combined seal for hydraulic cylinders

Abstract

The utility model discloses a zero leakage combined sealing element for hydraulic cylinder relates to hydraulic cylinder sealing technical field, including inner ring body, first end head outer ring, second end head outer ring and intermediate outer ring, first end head outer ring outer wall detachably is established with first contact sealing ring, second end head outer ring outer wall detachably is established with second contact sealing ring, and the outer wall of intermediate outer ring is equipped with the replacement sealing ring, and the diameter of replacement sealing ring is less than the diameter of first contact sealing ring and second contact sealing ring, the utility model discloses the first contact sealing ring, second contact sealing ring diameter of setting in first end head outer ring, second end head outer ring is same and all greater than the replacement sealing ring on the outer wall of intermediate outer ring, when the first contact sealing ring, second contact sealing ring wear and cause the sealing property to drop, and the replacement sealing ring is affected by the heat in the operation of hydraulic cylinder and expands to realize the replacement first contact sealing ring, second contact sealing ring and seal.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder sealing technology, and in particular to a zero-leakage combined seal for hydraulic cylinders. Background Technology

[0002] The core objective of hydraulic cylinder sealing is to prevent hydraulic oil leakage (internal and external leakage) and to prevent the intrusion of external contaminants. Internal leakage can lead to a decrease in the volumetric efficiency of the hydraulic cylinder, insufficient system pressure, or even failure to operate. External leakage can pollute the environment, especially in industries such as food and pharmaceuticals, where it may cause serious consequences. Furthermore, seal failure may accelerate the wear of hydraulic components, shorten the service life of equipment, and increase maintenance costs.

[0003] Current hydraulic cylinder seals suffer from insufficient sealing performance and a limited range of sealing methods. Specifically, damage to the seal immediately leads to sealing failure, directly impacting the normal operation of the hydraulic cylinder. Therefore, this invention proposes a zero-leakage combined seal for hydraulic cylinders to address these shortcomings. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide a zero-leakage combined seal for hydraulic cylinders. By setting a substitute seal on the outer wall of the first and second end outer rings with the same diameter and larger than that of the middle outer ring, when the first and second contact seals wear down and the sealing performance decreases, the substitute seal expands under the influence of heat during the operation of the hydraulic cylinder, thus replacing the first and second contact seals for sealing.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A zero-leakage combined seal for hydraulic cylinders includes an inner ring body, a first end outer ring, a second end outer ring, and an intermediate outer ring. The first end outer ring and the second end outer ring are detachably mounted on the outer wall of the inner ring body. An intermediate outer ring is detachably mounted on the outer wall of the inner ring body between the first end outer ring and the second end outer ring. A first contact sealing ring is detachably mounted on the outer wall of the first end outer ring. A second contact sealing ring is detachably mounted on the outer wall of the second end outer ring. A replacement sealing ring is mounted on the outer wall of the intermediate outer ring.

[0007] The first and second contact sealing rings have the same diameter, and the replacement sealing ring has a smaller diameter than the first and second contact sealing rings.

[0008] A further improvement is that: the outer wall of the inner ring is provided with a first external thread, and the inner walls of the first end outer ring, the second end outer ring and the middle outer ring are provided with a first internal thread that matches the first external thread.

[0009] A further improvement is that: the middle section of the outer wall of the first end outer ring, the second end outer ring, and the middle outer ring are all provided with mounting grooves, and the first contact sealing ring, the second contact sealing ring, and the substitute sealing ring are respectively connected to the mounting grooves on the first end outer ring, the second end outer ring, and the middle outer ring.

[0010] A further improvement is that: the mounting groove is provided with a semi-circular groove, and there are multiple semi-circular grooves. The inner walls of the first contact sealing ring, the second contact sealing ring and the substitute sealing ring are provided with semi-circular protrusions that are adapted to the semi-circular grooves.

[0011] A further improvement is that fastening rings are provided on the outer side of the connection between the first end outer ring and the middle outer ring, and on the outer side of the connection between the second end outer ring and the middle outer ring.

[0012] A further improvement is that: a second external thread is provided on the outer wall of one end of the first end outer ring, the outer wall of one end of the second end outer ring, and the outer walls of both ends of the middle outer ring; and a second internal thread adapted to the second external thread is provided on the inner wall of the fastening ring.

[0013] The beneficial effects of this utility model are as follows: This utility model detachably sets a first end outer ring, a second end outer ring, and an intermediate outer ring on the outer wall of the inner ring. A substitute sealing ring is set on the outer wall of the first end outer ring and the second end outer ring, with the same diameter and larger than that of the intermediate outer ring. When the first contact sealing ring and the second contact sealing ring wear down, resulting in a decrease in sealing performance, the substitute sealing ring expands under the influence of heat during the operation of the hydraulic cylinder, thereby replacing the first contact sealing ring and the second contact sealing ring for sealing. The combined sealing component with this structure can effectively prevent leakage problems caused by insufficient sealing performance. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the present utility model;

[0015] Figure 2 This is a schematic diagram showing the structural breakdown of this utility model;

[0016] Figure 3 This is a schematic diagram of the mounting groove structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the front sectional view of the structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the semi-circular protrusion structure of this utility model.

[0019] Wherein: 1. Inner ring body; 2. First end outer ring; 3. Second end outer ring; 4. Middle outer ring; 5. First contact sealing ring; 6. Second contact sealing ring; 7. Replacement sealing ring; 8. First external thread; 9. First internal thread; 10. Mounting groove; 11. Semi-circular groove; 12. Semi-circular protrusion; 13. Fastening ring; 14. Second external thread; 15. Second internal thread. Detailed Implementation

[0020] To deepen the understanding of this utility model, the following detailed description will be provided in conjunction with embodiments. These embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model.

[0021] Example 1

[0022] according to Figure 1-5 As shown, this embodiment proposes a zero-leakage combined seal for hydraulic cylinders, including an inner ring body 1, a first end outer ring 2, a second end outer ring 3, and an intermediate outer ring 4. The first end outer ring 2 and the second end outer ring 3 are detachably mounted on the outer wall of the inner ring body 1. The intermediate outer ring 4 is detachably mounted on the outer wall of the inner ring body 1 between the first end outer ring 2 and the second end outer ring 3. A first contact sealing ring 5 is detachably mounted on the outer wall of the first end outer ring 2. A second contact sealing ring 6 is detachably mounted on the outer wall of the second end outer ring 3. A substitute sealing ring 7 is mounted on the outer wall of the intermediate outer ring 4. The first contact sealing ring 5 and the second contact sealing ring 6 have the same diameter, and the diameter of the substitute sealing ring 7 is smaller than the diameter of the first contact sealing ring 5 and the second contact sealing ring 6.

[0023] The zero-leakage combined seal for hydraulic cylinders of this invention has the same diameter for the first contact sealing ring 5 and the second contact sealing ring 6, which is larger than the diameter of the substitute sealing ring 7. Therefore, the first contact sealing ring 5 and the second contact sealing ring 6 serve as the main sealing structure to achieve double sealing. As the hydraulic cylinder operates for a period of time, the first contact sealing ring 5 and the second contact sealing ring 6 wear down, causing the sealing performance to decline. At this time, as the operating heat of the hydraulic cylinder increases, the smaller diameter substitute sealing ring 7 expands due to heat and replaces the new sealing structure to provide continuous sealing, thereby preventing leakage.

[0024] The outer wall of the inner ring 1 is provided with a first external thread 8, and the inner walls of the first end outer ring 2, the second end outer ring 3, and the middle outer ring 4 are provided with a first internal thread 9 that matches the first external thread 8. This arrangement makes the zero-leakage combined seal for hydraulic cylinders of this utility model highly detachable, allowing for the individual replacement of any consumable component.

[0025] The first end outer ring 2, the second end outer ring 3, and the middle outer ring 4 are all provided with mounting grooves 10 on their middle outer walls. The first contact sealing ring 5, the second contact sealing ring 6, and the substitute sealing ring 7 are respectively connected to the mounting grooves 10 on the first end outer ring 2, the second end outer ring 3, and the middle outer ring 4. Each mounting groove 10 has a semi-circular groove 11 inside, and multiple semi-circular grooves 11 are provided. The inner walls of the first contact sealing ring 5, the second contact sealing ring 6, and the substitute sealing ring 7 are provided with semi-circular protrusions 12 that fit into the semi-circular grooves 11. This arrangement allows the semi-circular protrusions 12 to be positioned within the semi-circular grooves 11, thereby improving the installation stability of the first contact sealing ring 5, the second contact sealing ring 6, and the substitute sealing ring 7.

[0026] Example 2

[0027] according to Figure 1-5 As shown, this embodiment proposes a zero-leakage combined seal for hydraulic cylinders, including an inner ring body 1, a first end outer ring 2, a second end outer ring 3, and an intermediate outer ring 4. The first end outer ring 2 and the second end outer ring 3 are detachably mounted on the outer wall of the inner ring body 1. The intermediate outer ring 4 is detachably mounted on the outer wall of the inner ring body 1 between the first end outer ring 2 and the second end outer ring 3. A first contact sealing ring 5 is detachably mounted on the outer wall of the first end outer ring 2. A second contact sealing ring 6 is detachably mounted on the outer wall of the second end outer ring 3. A substitute sealing ring 7 is mounted on the outer wall of the intermediate outer ring 4. The first contact sealing ring 5 and the second contact sealing ring 6 have the same diameter, and the diameter of the substitute sealing ring 7 is smaller than the diameter of the first contact sealing ring 5 and the second contact sealing ring 6.

[0028] Fastening rings 13 are provided on the outer side of the connection between the first end outer ring 2 and the middle outer ring 4, and on the outer side of the connection between the second end outer ring 3 and the middle outer ring 4. Second external threads 14 are provided on the outer wall of one end of the first end outer ring 2, the outer wall of one end of the second end outer ring 3, and the outer walls of both ends of the middle outer ring 4. Second internal threads 15, which are adapted to the second external threads 14, are provided on the inner wall of the fastening rings 13. This invention, by providing fastening rings 13 to fix the first end outer ring 2 and the middle outer ring 4 from the outside, and to fix the second end outer ring 3 and the middle outer ring 4, enhances the stability of the first end outer ring 2, the second end outer ring 3, and the middle outer ring 4 on the inner ring body 1.

[0029] In this utility model, at least one set of intermediate outer rings 4 is provided, and multiple sets can be provided as needed. When multiple sets of intermediate outer rings 4 are provided, adjacent intermediate outer rings 4 are also reinforced and fixed by fastening rings 13.

[0030] This invention features a first end outer ring 2, a second end outer ring 3, and an intermediate outer ring 4 detachably mounted on the outer wall of the inner ring body 1. A substitute sealing ring 7 is mounted on the outer wall of the intermediate outer ring 4, where the first contact sealing ring 5 and the second contact sealing ring 6 of the first end outer ring 2 and the second end outer ring 3 have the same diameter and are both larger than the diameter of the first contact sealing ring 5. When the first contact sealing ring 5 and the second contact sealing ring 6 wear down, causing a decrease in sealing performance, the substitute sealing ring 7 expands due to the heat generated during the operation of the hydraulic cylinder, thus replacing the first contact sealing ring 5 and the second contact sealing ring 6 for sealing. This combined sealing structure effectively prevents leakage problems caused by insufficient sealing.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A zero-leakage combination seal for hydraulic cylinders, characterized in that: The device includes an inner ring body (1), a first end outer ring (2), a second end outer ring (3), and a middle outer ring (4). The first end outer ring (2) and the second end outer ring (3) are detachably provided on the outer wall of the inner ring body (1). The middle outer ring (4) is detachably provided on the outer wall of the inner ring body (1) between the first end outer ring (2) and the second end outer ring (3). The first contact sealing ring (5) is detachably provided on the outer wall of the first end outer ring (2). The second contact sealing ring (6) is detachably provided on the outer wall of the second end outer ring (3). The substitute sealing ring (7) is provided on the outer wall of the middle outer ring (4). The first contact sealing ring (5) and the second contact sealing ring (6) have the same diameter, and the diameter of the substitute sealing ring (7) is smaller than that of the first contact sealing ring (5) and the second contact sealing ring (6).

2. The zero-leakage combined seal for hydraulic cylinders according to claim 1, characterized in that: The outer wall of the inner ring body (1) is provided with a first external thread (8), and the inner walls of the first end outer ring (2), the second end outer ring (3) and the middle outer ring (4) are provided with a first internal thread (9) that is adapted to the first external thread (8).

3. The zero-leakage combined seal for hydraulic cylinders according to claim 1, characterized in that: The first end outer ring (2), the second end outer ring (3) and the middle outer ring (4) are all provided with mounting grooves (10), and the first contact sealing ring (5), the second contact sealing ring (6) and the substitute sealing ring (7) are respectively connected to the mounting grooves (10) on the first end outer ring (2), the second end outer ring (3) and the middle outer ring (4).

4. The zero-leakage combined seal for hydraulic cylinders according to claim 3, characterized in that: The mounting groove (10) is provided with a semi-circular groove (11) inside. There are multiple semi-circular grooves (11). The inner walls of the first contact sealing ring (5), the second contact sealing ring (6) and the substitute sealing ring (7) are provided with semi-circular protrusions (12) that are adapted to the semi-circular grooves (11).

5. The zero-leakage combined seal for hydraulic cylinders according to claim 1, characterized in that: Fastening rings (13) are provided on the outer side of the connection between the first end outer ring (2) and the middle outer ring (4) and on the outer side of the connection between the second end outer ring (3) and the middle outer ring (4).

6. The zero-leakage combined seal for hydraulic cylinders according to claim 5, characterized in that: The outer wall of one end of the first end outer ring (2), the outer wall of one end of the second end outer ring (3), and the outer walls of both ends of the middle outer ring (4) are provided with a second external thread (14), and the inner wall of the fastening ring (13) is provided with a second internal thread (15) that is adapted to the second external thread (14).

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