A lip seal ring with support spring

Abstract

This utility model provides a lip-shaped sealing ring with a supporting spring at the lip, including a sealing ring body. The inner sides of both the upper and lower ends of the sealing ring body have snap grooves, and a wear-resistant layer is adhered between the two snap grooves. An annular groove is formed on the inner side of the sealing ring body, and a corrosion-resistant alloy spring is interference-fitted into the annular groove. An annular rubber pressure plate is attached to the inner side of the corrosion-resistant alloy spring. A micro piezoelectric thin film sensor is embedded on the outer side of the wear-resistant layer. An annular conical groove is formed on the outer side of the sealing ring body, and a rubber pressure ring is tightly attached to the inner wall of the annular conical groove. The rubber pressure ring is filled with filler rubber, and a shape memory alloy spring is installed inside the filler rubber. This utility model solves the problems of easy corrosion, poor dynamic adaptability, and difficult installation and maintenance of traditional spring-type sealing rings through a corrosion-resistant alloy spring, intelligent pressure adjustment, and a quick installation structure. This effectively extends the life of the spring in the device, and also effectively improves the sealing stability and pressure distribution uniformity at high temperatures.

Description

Technical Field

[0001] This utility model is a lip-shaped sealing ring with a supporting spring at the lip opening, belonging to the field of sealing ring technology. Background Technology

[0002] Lip seals are commonly used sealing elements in rotary or reciprocating sealing systems. Traditional lip seals primarily rely on the elasticity of the rubber material to provide sealing force. However, under high pressure (≥10MPa), high speed (linear velocity ≥10m / s), or high temperature (≥120℃) conditions, the elasticity of the rubber decays rapidly, leading to seal failure. To address this issue, existing technologies have incorporated a support spring at the lip, enhancing the sealing effect through the continuous pressure of the spring.

[0003] However, the spring stiffness of current spring-loaded lip seals is fixed and cannot adapt to changes in working conditions (such as pressure fluctuations of ±5MPa). The sealing force is insufficient at low speeds and the frictional heat generation is severe at high speeds (temperature rise ≥40℃). The dynamic adaptability is poor and stress concentration is easily caused, leading to rubber tearing. There is an urgent need for a lip seal with a supporting spring at the lip to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a lip seal with a supporting spring at the lip opening, thereby solving the problems mentioned in the background section. This invention employs a lip seal with a corrosion-resistant spring structure, intelligent pressure adjustment, and quick installation function to improve sealing reliability and service life.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a lip-shaped sealing ring with a supporting spring at the lip, comprising a sealing ring body, wherein the inner sides of the upper and lower ends of the sealing ring body are provided with snap grooves, and a wear-resistant layer is adhered between the two snap grooves; an annular groove is provided on the inner side of the sealing ring body, and a corrosion-resistant alloy spring is interference-fitted into the annular groove; an annular rubber pressure plate is attached to the inner side of the corrosion-resistant alloy spring; a micro piezoelectric thin film sensor is embedded on the outer side of the wear-resistant layer; an annular conical groove is provided on the outer side of the sealing ring body, and a rubber pressure ring is tightly attached to the inner wall of the annular conical groove; the rubber pressure ring is filled with filler rubber, and a shape memory alloy spring is installed on the inner side of the filler rubber; a sponge-like polyurethane buffer layer is installed on the inner side of the rubber pressure ring; and an installation shell is installed on the outside of the sealing ring body.

[0006] Furthermore, the sealing ring body is made of hydrogenated nitrile rubber, and the wear-resistant layer is composed of polytetrafluoroethylene and molybdenum disulfide.

[0007] Furthermore, the annular rubber pad abuts against the outside of the micro piezoelectric film sensor, and a signal transmission line is installed at one end of the micro piezoelectric film sensor, with a polyimide outer sleeve covering the signal transmission line.

[0008] Furthermore, the inner side of the shape memory alloy spring is tightly fitted with the rubber pressure ring.

[0009] Furthermore, the sponge-like polyurethane buffer layer abuts against the outside of the corrosion-resistant alloy spring.

[0010] Furthermore, the mounting housing is completely covered by the filled rubber, and a mounting hole plate is welded to the lower edge of the mounting housing.

[0011] The beneficial effects of this utility model are as follows: This utility model provides a lip-shaped sealing ring with a supporting spring at the lip. Because this utility model adds a wear-resistant layer, a corrosion-resistant alloy spring, an annular rubber pressure plate, a micro piezoelectric thin film sensor, a rubber pressure ring, a sponge-like polyurethane buffer layer, a shape memory alloy spring, filling rubber, and a mounting shell, the structure is reasonable. Through the corrosion-resistant alloy spring, intelligent pressure adjustment, and quick installation structure, it solves the problems of easy corrosion, poor dynamic adaptability, and difficult installation and maintenance of traditional spring-type sealing rings. This effectively extends the life of the spring in the device, and also effectively improves the sealing stability and pressure distribution uniformity at high temperatures, making it highly practical. Attached Figure Description

[0012] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0013] Figure 1 This is a schematic diagram of the structure of a lip-shaped sealing ring with a supporting spring at the lip opening according to the present invention.

[0014] Figure 2 This is a cross-sectional structural diagram of a lip-shaped sealing ring with a supporting spring at the lip opening according to the present invention.

[0015] Figure 3 This is a schematic diagram of the filling rubber structure of a lip-shaped sealing ring with a supporting spring at the lip opening, according to the present invention.

[0016] In the diagram: 1-Sealing ring body, 2-Snap groove, 3-Wear-resistant layer, 4-Annular groove, 5-Corrosion-resistant alloy spring, 6-Annular rubber pressure plate, 7-Miniature piezoelectric film sensor, 8-Signal transmission line, 9-Polyimide outer jacket, 10-Annular conical groove, 11-Rubber pressure ring, 12-Sponge-like polyurethane buffer layer, 13-Memory alloy spring, 14-Filling rubber, 15-Mounting housing. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] Please see Figures 1-3 This utility model provides a technical solution: a lip-shaped sealing ring with a supporting spring at the lip, including a sealing ring body 1, with grooves 2 on the inner sides of both the upper and lower ends of the sealing ring body 1, a wear-resistant layer 3 bonded between the two grooves 2, an annular groove 4 on the inner side of the sealing ring body 1, a corrosion-resistant alloy spring 5 interference-fitted into the annular groove 4, an annular rubber pressure plate 6 attached to the inner side of the corrosion-resistant alloy spring 5, a micro piezoelectric thin film sensor 7 embedded on the outer side of the wear-resistant layer 3, an annular conical groove 10 on the outer side of the sealing ring body 1, a rubber pressure ring 11 tightly attached to the inner wall of the annular conical groove 10, a filling rubber 14 filled in the rubber pressure ring 11, a memory alloy spring 13 installed inside the filling rubber 14, a sponge-like polyurethane buffer layer 12 installed inside the rubber pressure ring 11, and an installation shell 15 installed on the outer side of the sealing ring body 1. This design solves the problems of easy corrosion, poor dynamic adaptability, and difficult installation and maintenance of traditional spring-type sealing rings.

[0019] In the first embodiment of this utility model: the sealing ring body 1 is made of hydrogenated nitrile butadiene rubber, and the wear-resistant layer 3 is composed of polytetrafluoroethylene and molybdenum disulfide composite. By adding hydrogenated nitrile butadiene rubber to the sealing ring body 1, with a hardness of 75A, the oil resistance is improved by 3 times compared with traditional NBR. The wear-resistant layer 3, composed of polytetrafluoroethylene and molybdenum disulfide composite, can reduce the contact friction coefficient with the external shaft to 0.08. The annular rubber pressure plate 6 abuts against the outside of the micro piezoelectric thin film sensor 7. A signal transmission line 8 is installed at one end of the micro piezoelectric thin film sensor 7, and a polyimide outer sleeve 9 is provided on the outside of the signal transmission line 8. The added micro piezoelectric thin film sensor 7 can transmit the pressure signal inside the device to the external monitoring system. The inner side of the shape memory alloy spring 13 is tightly attached to the rubber pressure ring 11. The added shape memory alloy spring 13 is made of nickel-titanium alloy, and the phase transformation temperature is set to 70℃ (which can be adjusted by heat treatment). It has the following characteristics: austenitic phase (≥70℃): the elastic modulus increases by 50%, the stiffness increases from 2N / mm to 3N / mm, and the radial pressure on the lip increases by about 0.5MPa; martensitic phase (<70℃): maintains a low stiffness state to avoid excessive sealing force at low temperature, which would lead to frictional heat generation.

[0020] The sponge-like polyurethane buffer layer 12 abuts against the outside of the corrosion-resistant alloy spring 5. The added sponge-like polyurethane buffer layer 12 has a density of 0.5 g / cm³, which can effectively absorb vibration energy. The mounting shell 15 completely covers the outside of the filling rubber 14, and the lower edge of the mounting shell 15 is welded with a mounting hole plate. The addition of the mounting shell 15 facilitates the quick installation of the entire device.

[0021] As a second embodiment of this utility model, the working process (taking high-temperature conditions as an example) is as follows:

[0022] In the initial state, the equipment is started, the medium temperature is <70℃, the shape memory alloy spring 13 is in the martensitic phase, the corrosion-resistant alloy spring 5 provides a base pressure of 2MPa, and the miniature piezoelectric film sensor 7 monitors and displays the current pressure in real time.

[0023] After 30 minutes of operation, the medium temperature rises to 75°C, and the shape memory alloy spring 13 transforms into the austenitic phase, increasing its stiffness by 50%. Through the rubber pressure ring 11, the sponge-like polyurethane buffer layer 12, and the corrosion-resistant alloy spring 5, the lip is pushed to a radial displacement of 0.1 mm, thus maintaining a seal.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lip-shaped sealing ring with a supporting spring at the lip opening, comprising a sealing ring body (1), characterized in that: The sealing ring body (1) has a snap groove (2) on the inner side of both the upper and lower ends. A wear-resistant layer (3) is bonded between the two snap grooves (2). An annular groove (4) is opened on the inner side of the sealing ring body (1). A corrosion-resistant alloy spring (5) is inserted into the annular groove (4). An annular rubber pressure plate (6) is attached to the inner side of the corrosion-resistant alloy spring (5). A micro piezoelectric thin film sensor (7) is embedded on the outer side of the wear-resistant layer (3). An annular conical groove (10) is opened on the outer side of the sealing ring body (1). A rubber pressure ring (11) is tightly attached to the inner wall of the annular conical groove (10). A filling rubber (14) is filled in the rubber pressure ring (11). A memory alloy spring (13) is installed on the inner side of the filling rubber (14). A sponge-like polyurethane buffer layer (12) is installed on the inner side of the rubber pressure ring (11). An installation shell (15) is installed on the outer side of the sealing ring body (1).

2. A lip-shaped sealing ring with a supporting spring at the lip opening according to claim 1, characterized in that: The sealing ring body (1) is hydrogenated nitrile rubber, and the wear-resistant layer (3) is composed of polytetrafluoroethylene and molybdenum disulfide.

3. A lip-shaped sealing ring with a supporting spring at the lip opening according to claim 1, characterized in that: The annular rubber pad (6) abuts against the outside of the micro piezoelectric thin film sensor (7). A signal transmission line (8) is installed at one end of the micro piezoelectric thin film sensor (7), and a polyimide jacket (9) is wrapped around the outside of the signal transmission line (8).

4. A lip-shaped sealing ring with a supporting spring at the lip opening according to claim 1, characterized in that: The inner side of the memory alloy spring (13) is in close contact with the rubber pressure ring (11).

5. A lip-shaped sealing ring with a supporting spring at the lip opening according to claim 1, characterized in that: The sponge-like polyurethane buffer layer (12) abuts against the outside of the corrosion-resistant alloy spring (5).

6. A lip-shaped sealing ring with a supporting spring at the lip opening according to claim 1, characterized in that: The mounting housing (15) is completely covered by the filling rubber (14), and the lower edge of the mounting housing (15) is welded with a mounting hole plate.

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