Guide ring convenient to maintain and replace

Abstract

The application discloses a guide ring convenient to maintain and replace, which is embedded in the side wall of a piston. The side wall of the piston is provided with grooves. The guide ring comprises a first ring body, a second ring body and a third ring body, which are embedded in the three layers of grooves respectively. The first and second ring bodies are sealing rings. The third ring body comprises upper and lower scraping rings and a middle lining ring. The lining ring is provided with an oil return hole and is in a corrugated shape. The scraping ring and the lining ring are connected through concave-convex matching structures. The application has the advantages of convenience in maintenance and replacement, good sealing, oil scraping and oil return effects, excellent structural strength and elastic performance, stable connection of the scraping ring and the lining ring, normal operation of equipment, and reduced maintenance cost.

Description

Technical Field

[0001] This application relates to the field of piston sealing technology, and in particular to a guide ring that is easy to maintain and replace. Background Technology

[0002] In reciprocating mechanical devices such as hydraulic cylinders and pneumatic cylinders, guide rings are crucial components. They mainly serve to guide and support the piston, as well as provide a seal. They effectively ensure that the piston moves smoothly within the cylinder, prevent direct contact between the piston and the inner wall of the cylinder, and reduce the leakage of the working medium. Traditional guide rings are typically one-piece structures. When a guide ring wears or is damaged and needs maintenance or replacement, the entire guide ring often needs to be removed from the piston, a cumbersome and time-consuming operation that significantly impacts equipment maintenance efficiency. Furthermore, traditional guide rings have a relatively singular function, making it difficult to simultaneously achieve good sealing performance, effective oil scraping, and efficient oil return. For example, some guide rings, while possessing some sealing capability, have poor oil scraping performance, resulting in excessive oil residue on the cylinder wall and affecting normal equipment operation. Other guide rings have poorly designed oil return holes, leading to low oil return efficiency and further exacerbating the oil residue problem. In addition, the structural strength and elasticity of traditional guide rings need improvement; they are prone to deformation and rapid wear during long-term reciprocating motion, shortening their service life and increasing maintenance costs. Utility Model Content

[0003] This invention addresses the problems of inconvenient maintenance and replacement of existing guide rings, and the difficulty in simultaneously achieving sealing, oil scraping, and oil return performance, by providing a guide ring that is easy to maintain and replace.

[0004] The objective of this utility model is mainly achieved through the following solution: A guide ring, designed for easy maintenance and replacement, is embedded in the side wall of the piston. The side wall of the piston has grooves for installing the guide ring. The guide ring includes a first ring body, a second ring body, and a third ring body. The side wall of the piston has three layers of grooves from top to bottom. The first ring body, the second ring body, and the third ring body are respectively embedded in the three layers of grooves from top to bottom. The first ring body and the second ring body are both sealing rings. The third ring body includes scraper rings on the upper and lower sides and a liner ring in the middle. The liner ring has multiple oil return holes and has a corrugated structure.

[0005] Preferably, the waveform of the bushing is a sine wave, a sawtooth wave, or a trapezoidal wave.

[0006] Preferably, the corrugated structure of the bushing has a wave height of 0.5–2 mm and a wavelength of 3–8 mm, and the wave crests and troughs are transitioned by a smooth arc surface.

[0007] Preferably, the oil return hole is uniformly arranged in a circle around the axis of the bushing, and the oil return hole is located between the crests and troughs of the bushing.

[0008] Preferably, the outer end face of the scraper ring is an inclined oil scraping surface with an inclination angle of 15–45°, and the inclined oil scraping surfaces of the upper and lower scraper rings are in opposite directions, extending outward toward the piston movement direction respectively.

[0009] Preferably, the inner wall of the oil return hole of the bushing is covered with an oleophobic coating.

[0010] Preferably, the first and second ring bodies are made of polytetrafluoroethylene composite material, the scraper ring is made of polyetheretherketone filled with glass fiber, and the liner ring is made of spring steel or phosphor bronze.

[0011] In summary, compared with the prior art, the present invention has the following beneficial technical effects: (1) This utility model is easy to maintain and replace. The guide ring is composed of a first ring body, a second ring body and a third ring body, and is respectively embedded in the three layers of grooves from top to bottom on the piston side wall. When one of the ring bodies is worn or damaged, it is only necessary to remove the ring body from the corresponding groove for replacement. There is no need to disassemble the entire guide ring, which greatly simplifies the maintenance and replacement process, improves maintenance efficiency and reduces maintenance costs. (2) The present invention has excellent sealing performance. Both the first ring body and the second ring body are sealing rings. The setting of two layers of sealing rings can effectively enhance the sealing effect of the guide ring, prevent the leakage of working medium, and ensure the normal operation of the equipment. (3) The present invention has good oil scraping and oil return effects. The third ring body includes upper and lower scraping rings and a middle liner ring. The outer end face of the scraping ring is an inclined oil scraping surface, and the inclined oil scraping surfaces of the upper and lower scraping rings are in opposite directions, extending outwards towards the piston movement direction. In this way, during the reciprocating motion of the piston, the upper and lower scraping rings can scrape off the oil residue in different directions on the inner wall of the cylinder. The liner ring is provided with multiple oil return holes, and the scraped oil can flow back through the oil return holes to avoid the oil accumulating in the cylinder. At the same time, the liner ring has a corrugated structure, which can increase the contact area between the liner ring and the oil, promote the flow of oil, and further improve the oil return efficiency. (4) The present invention has good structural strength and elastic performance. The liner is made of spring steel or phosphor bronze, which has high structural strength and good elastic performance. It can provide stable support for the guide ring during piston movement. At the same time, the corrugated structure also enhances the elastic deformation ability of the liner, enabling it to better adapt to the gap changes between the piston and the cylinder and reduce wear. (5) In this utility model, the oil return hole is uniformly arranged in a circle along the axis of the bushing and is located between the crests and troughs of the bushing. This arrangement allows the oil to flow back through the oil return hole more evenly and smoothly, avoiding blockage of the oil return hole and ensuring the stability of the oil return. In addition, the inner wall of the oil return hole is covered with an oleophobic coating, which can reduce the adhesion of oil to the inner wall of the oil return hole and further improve the oil return efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the guide ring of this utility model, which is easy to maintain and replace, installed on the piston; Figure 2 This is an installation diagram of the guide ring of this utility model that is easy to maintain and replace; Figure 3 This is a schematic diagram of the structure of the third ring body in the guide ring of this utility model that is easy to maintain and replace; Figure 4 This is an exploded view of the third ring body in the guide ring of this utility model that is easy to maintain and replace; Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0013] Reference numerals: 1-piston, 2-groove, 3-first ring body, 4-second ring body, 5-third ring body, 6-scraper ring, 7-liner ring, 8-oil return hole, 9-inclined scraper surface. Detailed Implementation

[0014] The following specific embodiments, in conjunction with the appendix, demonstrate this approach. Figure 1-5 The technical solution of this utility model will be further described in detail below. It should be understood that the implementation of this utility model is not limited to the following embodiments, and any modifications and / or alterations made to this utility model will fall within the protection scope of this utility model.

[0015] Example 1: A guide ring that is easy to maintain and replace is embedded in the side wall of a piston 1. The side wall of the piston 1 has grooves 2 for installing the guide ring. The guide ring includes a first ring body 3, a second ring body 4, and a third ring body 5. The side wall of the piston 1 has three layers of grooves 2 from top to bottom. The first ring body 3, the second ring body 4, and the third ring body 5 are respectively embedded in the three layers of grooves 2 from top to bottom. The first ring body 3 and the second ring body 4 are both sealing rings made of polytetrafluoroethylene composite material. The third ring body 5 includes scraper rings 6 on the upper and lower sides and a liner ring 7 in the middle. The scraper rings 6 are made of polyetheretherketone filled with glass fiber, and the liner ring 7 is made of spring steel. Specifically, the waveform of the bushing 7 is a sine wave with a corrugated structure, a wave height of 1 mm, and a wavelength of 5 mm. The peaks and troughs are transitioned by a smooth arc surface. Multiple oil return holes 8 are provided on the bushing 7. The oil return holes 8 are evenly arranged in a circle along the axis of the bushing 7 and are located between the peaks and troughs of the bushing 7. The inner wall of the oil return holes 8 is covered with an oleophobic coating. Specifically, the outer end face of the scraper ring 6 is an inclined oil scraping surface 9 with an inclination angle of 30°. The inclined oil scraping surfaces 9 of the upper and lower scraper rings 6 are in opposite directions and extend outward toward the direction of piston 1 movement, respectively. Example 2: A guide ring, designed for easy maintenance and replacement, is embedded in the side wall of a piston 1. The side wall of the piston 1 has grooves 2 for mounting the guide ring. The guide ring includes a first ring body 3, a second ring body 4, and a third ring body 5. The side wall of the piston 1 has three layers of grooves 2 from top to bottom, and the first ring body 3, the second ring body 4, and the third ring body 5 are respectively embedded in the three layers of grooves 2 from top to bottom. The first ring body 3 and the second ring body 4 are both sealing rings made of polytetrafluoroethylene composite material. The third ring body 5 includes scraper rings 6 on the upper and lower sides and a liner ring 7 in the middle. The scraper rings 6 are made of polyetheretherketone filled with glass fiber, and the liner ring 7 is made of phosphor bronze. Specifically, the wave of the bushing 7 is a sawtooth wave with a corrugated structure, a wave height of 0.5 mm, and a wavelength of 3 mm. The peaks and troughs are transitioned by a smooth arc surface. Multiple oil return holes 8 are provided on the bushing 7. The oil return holes 8 are evenly arranged in a circle around the axis of the bushing 7 and are located between the peaks and troughs of the bushing 7. The inner wall of the oil return holes 8 is covered with an oleophobic coating. Specifically, the outer end face of the scraper ring 6 is an inclined oil scraping surface 9 with an inclination angle of 15°. The inclined oil scraping surfaces 9 of the upper and lower scraper rings 6 are in opposite directions and extend outward toward the direction of piston 1 movement, respectively.

[0016] Example 3: A guide ring that is easy to maintain and replace is embedded in the side wall of a piston 1. The side wall of the piston 1 has grooves 2 for installing the guide ring. The guide ring includes a first ring body 3, a second ring body 4, and a third ring body 5. The side wall of the piston 1 has three layers of grooves 2 from top to bottom. The first ring body 3, the second ring body 4, and the third ring body 5 are respectively embedded in the three layers of grooves 2 from top to bottom. The first ring body 3 and the second ring body 4 are both sealing rings made of polytetrafluoroethylene composite material. The third ring body 5 includes scraper rings 6 on the upper and lower sides and a liner ring 7 in the middle. The scraper rings 6 are made of polyetheretherketone filled with glass fiber, and the liner ring 7 is made of spring steel. Specifically, the wave of the bushing 7 is a trapezoidal wave with a corrugated structure, a wave height of 2mm, a wavelength of 8mm, and a smooth arc transition between the wave crest and the wave trough. The bushing 7 has multiple oil return holes 8, which are evenly arranged in a circle around the axis of the bushing 7 and are located between the wave crest and the wave trough of the bushing 7. The inner wall of the oil return hole 8 is covered with an oleophobic coating. Specifically, the outer end face of the scraper ring 6 is an inclined oil scraping surface 9 with an inclination angle of 45°. The inclined oil scraping surfaces 9 of the upper and lower scraper rings 6 are in opposite directions and extend outward toward the direction of piston 1 movement, respectively.

[0017] This embodiment provides a connection method between a scraper ring 6 and a bushing 7. The scraper ring 6 and the bushing 7 are connected by a concave-convex fit structure. Both the upper and lower end faces of the bushing 7 are provided with annular bosses. The scraper ring 6 has an annular groove on one end face facing the bushing 7 that matches the annular bosses. The annular bosses are embedded in the annular grooves, and the two are in an interference fit.

[0018] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A guide ring that is easy to maintain and replace, embedded in the side wall of a piston (1), wherein the side wall of the piston (1) is provided with a groove (2) for installing the guide ring, characterized in that: The guide ring includes a first ring body (3), a second ring body (4) and a third ring body (5). The side wall of the piston (1) is provided with three layers of grooves (2) from top to bottom. The first ring body (3), the second ring body (4) and the third ring body (5) are respectively embedded in the three layers of grooves (2) from top to bottom. The first ring body (3) and the second ring body (4) are both sealing rings. The third ring body (5) includes scraper rings (6) on the upper and lower sides and a liner ring (7) in the middle. The liner ring (7) is provided with multiple oil return holes (8) and has a corrugated structure.

2. The guide ring for easy maintenance and replacement according to claim 1, characterized in that: The waveform of the bushing (7) is a sine wave, a sawtooth wave, or a trapezoidal wave.

3. The guide ring for easy maintenance and replacement according to claim 2, characterized in that: The corrugated structure of the bushing (7) has a wave height of 0.5–2 mm and a wavelength of 3–8 mm, and the wave crests and troughs are transitioned by a smooth arc surface.

4. The guide ring for easy maintenance and replacement according to claim 1, characterized in that: The oil return hole (8) is uniformly arranged in a circle along the axis of the bushing (7), and the oil return hole (8) is located between the crests and troughs of the bushing (7).

5. The guide ring for easy maintenance and replacement according to claim 1, characterized in that: The outer end face of the scraper ring (6) is an inclined oil scraping surface (9). The inclined oil scraping surface (9) has an inclination angle of 15–45°, and the inclined oil scraping surfaces (9) of the upper and lower scraper rings (6) are in opposite directions, extending outward toward the direction of piston (1) movement.

6. The guide ring for easy maintenance and replacement according to claim 1, characterized in that: The inner wall of the oil return hole (8) of the bushing (7) is covered with an oleophobic coating.

7. The guide ring for easy maintenance and replacement according to claim 1, characterized in that: The first ring (3) and the second ring (4) are made of polytetrafluoroethylene composite material, the scraper ring (6) is made of polyetheretherketone filled with glass fiber, and the liner ring (7) is made of spring steel or phosphor bronze.

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