Efficient reciprocating compressor oil wiper

Abstract

The efficient reciprocating compressor oil scraper comprises an oil scraping flange, a first oil scraping box and a second oil scraping box are arranged on the two sides of the oil scraping flange correspondingly, a third oil scraping box is arranged on the side, away from the oil scraping flange, of the second oil scraping box, and oil scraping assemblies are arranged in the first oil scraping box, the second oil scraping box and the third oil scraping box; the oil scraping assembly sequentially comprises an oil blocking ring, an oil scraping ring set, a radial floating oil scraping ring set and a sealing ring set in the axial direction of the piston rod, the reciprocating compressor relates to the technical field of reciprocating compressors, a conventional oil scraper is divided into three parts, namely the oil blocking ring, the oil scraping ring set and the sealing ring set, and is changed into four parts, namely the oil blocking ring, the oil scraping ring set, the radial floating oil scraping ring set and the sealing ring set; and under the condition that other conditions are not changed, the oil scraping effect of the oil scraper component can be improved, the influence of the piston speed is avoided, the efficiency of the whole compressor can be improved, and considerable economic benefits are achieved.

Description

Technical Field

[0001] This invention relates to the field of reciprocating compressor technology, specifically to a high-efficiency reciprocating compressor oil scraper. Background Technology

[0002] With increasing global energy consumption and the development of energy science and technology, the requirements for reciprocating compressors are becoming increasingly stringent, demanding compact structures and convenient space arrangement. Increasing piston speed is the most direct method. Traditional oil scrapers consist of only three parts: an oil-blocking ring, an oil-scraping ring assembly, and a sealing ring assembly. When the piston reciprocates at high speed, the piston rod vibrates more intensely and is prone to sinking and shifting, resulting in an increased gap between the oil-scraping ring assembly and the piston rod. Some lubricating oil cannot be scraped off and seeps into the middle compartment along the piston rod. The unscraped lubricating oil enters the drain tank through the drain port at the bottom of the middle compartment and cannot be recovered and reused, causing lubricating oil loss. At the same time, rapid consumption of lubricating oil can easily trigger a low liquid level alarm, forcing the equipment to stop and affecting continuous operation. To address the above problems, there is an urgent need for a new type of oil scraper with high efficiency. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a high-efficiency oil scraper for reciprocating compressors, solving the problem that the oil scraping effect of existing reciprocating compressor oil scrapers deteriorates, resulting in not only a waste of lubricating oil but also a low lubricating oil alarm, which affects the long-term stable operation of the reciprocating compressor.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency reciprocating compressor oil scraper, comprising an oil scraping flange, a first oil scraping box and a second oil scraping box respectively disposed on both sides of the oil scraping flange, and a third oil scraping box disposed on the side of the second oil scraping box away from the oil scraping flange; an oil scraping assembly is disposed within the first, second, and third oil scraping boxes, and the oil scraping assembly comprises, in sequence along the axial direction of the piston rod: An oil-blocking ring is disposed inside the first oil scraper box to initially block the lubricating oil on the piston rod; The oil scraper ring assembly is located in the first oil scraper box and is used to scrape off the lubricating oil on the piston rod. It is also provided with a lubricating oil channel to allow the scraped lubricating oil to flow back to the crosshead chamber. A radially floating scraper ring assembly is disposed in the second scraper box for further scraping off residual lubricating oil. The radially floating scraper ring assembly includes a floating sealing groove that can be radially floating and installed in the second scraper box, an elastic body disposed in the floating sealing groove, and a sealing element that is pushed by the elastic body and tightly held on the piston rod. The sealing ring assembly, located within the third oil scraper box, comprises at least two sealing rings and a pre-tightening structure.

[0005] Preferably, the pre-tightening structure includes a spring and a spring plate, the spring plate abutting against the outer wall of the sealing ring, and the spring being fixed between the spring plate and the inner wall of the third oil scraper box, so that a pre-tightening force is applied to the sealing ring through the spring plate.

[0006] Preferably, the bottom of the second oil scraper box is provided with an oil return port for draining lubricating oil that accumulates at the bottom of the second oil scraper box and may affect the radial movement of the floating seal groove.

[0007] Preferably, the floating sealing groove is made of a non-metallic wear-resistant material, including PEEK and PTFE materials.

[0008] Preferably, the number of radial floating scraper ring assemblies is two or more, and the multiple radial floating scraper ring assemblies are spaced apart in the scraper box along the piston rod axial direction.

[0009] Preferably, it also includes a pressure cap, which is disposed at the end of the first oil scraper box and is fixedly connected to the first oil scraper box and the oil scraper flange by a first bolt and a nut.

[0010] Preferably, the second and third oil scraper boxes are connected to the oil scraper flange by a second bolt.

[0011] Preferably, the oil scraper flange is connected to the compressor body by a third bolt.

[0012] Preferably, a first gasket is provided between the oil scraper flange and the third bolt, and a second gasket is provided between the oil scraper flange and the compressor body.

[0013] Preferably, the elastomer can be replaced with an O-ring.

[0014] Beneficial effects This invention provides a high-efficiency reciprocating compressor oil scraper, which has the following beneficial effects: This invention changes the conventional oil scraper, which consists of three parts—an oil-blocking ring, an oil scraping ring group, and a sealing ring group—to four parts: an oil-blocking ring, an oil scraping ring group, a radially floating oil scraping ring group, and a sealing ring group. This improves the oil scraping effect of the oil scraper components. Under the same conditions, it is not affected by the piston speed and can improve the efficiency of the entire compressor, resulting in considerable economic benefits. This application solves the problem of small radial compensation distance of the elastomer in the oil scraper, increasing the radial compensation distance by at least 200%, and is not affected by the sinking or vibration of the piston rod during use. It can move radially with the piston rod, resulting in reliable oil scraping effect. By setting two sealing rings in the sealing ring assembly and adding springs and spring plates, the sealing effect of the sealing ring assembly is improved. The improved sealing effect will also improve the oil return function of the scraper, and avoid the airflow caused by the pressure difference between the two compartments due to poor sealing effect, which will affect the oil return effect of the lubricating oil. It is convenient to use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2 This is a partially enlarged structural schematic diagram of the present invention.

[0017] In the diagram: 1. Nut; 2. First bolt; 3. Gland; 4. First oil scraper box; 5. Second bolt; 6. First gasket; 7. Oil scraper flange; 8. Oil scraper ring assembly; 9. Second gasket; 10. Oil blocking ring; 11. Third bolt; 12. Third oil scraper box; 13. Piston rod; 14. Sealing ring assembly; 15. Spring; 16. Spring plate; 17. Radial floating oil scraper ring assembly; 18. Second oil scraper box; 19. Floating sealing groove; 20. Elastomer; 21. Seal. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-2 This invention provides a technical solution: a high-efficiency reciprocating compressor oil scraper, comprising an oil scraping flange 7, with a first oil scraping box 4 and a second oil scraping box 18 respectively disposed on both sides of the oil scraping flange 7, and a third oil scraping box 12 disposed on the side of the second oil scraping box 18 away from the oil scraping flange 7. An oil scraping assembly is disposed within the first oil scraping box 4, the second oil scraping box 18, and the third oil scraping box 12, and the oil scraping assembly comprises, in sequence along the axial direction of the piston rod 13: An oil-blocking ring 10 is disposed inside the first oil scraper box 4 to initially block the lubricating oil on the piston rod 13; The oil scraper ring assembly 8 is disposed in the first oil scraper box 4 and is used to scrape off the lubricating oil on the piston rod 13. It is also provided with a lubricating oil channel for the scraped lubricating oil to flow back to the crosshead chamber. A radially floating scraper ring assembly 17 is disposed in the second scraper box 18 for further scraping off residual lubricating oil. The radially floating scraper ring assembly 17 includes a floating sealing groove 19 that can be radially floatingly installed in the second scraper box 18, an elastic body 20 disposed in the floating sealing groove 19, and a sealing member 21 that is pushed by the elastic body 20 and tightly held on the piston rod 13. The sealing ring assembly 14 is disposed within the third oil scraper box 12 and includes at least two sealing rings and a pre-tightening structure.

[0020] By adopting the above technical solution, when the piston rod reciprocates at high speed, the oil blocking ring 10 first blocks the lubricating oil in the crosshead chamber from spreading to the middle body compartment. The remaining lubricating oil is scraped off by the oil scraper ring group 8 and flows back to the crosshead chamber through the lubricating oil channel. The remaining trace amount of lubricating oil is scraped off a second time by the radial floating oil scraper ring group 17 in the second oil scraper box 18. The elastic body 20 pushes the seal 21 to hold the piston rod 13 tightly. The floating sealing groove 19 adapts to the displacement of the piston rod 13. The sealing ring group 14 blocks the airflow between the middle body compartment and the crosshead chamber, ensuring smooth oil return channel. This solves the problems of high-speed oil scraping failure and oil return interference of traditional oil scrapers, effectively improving the lubricating oil scraping rate and adapting to high-speed piston operation scenarios.

[0021] In this embodiment, the pre-tightening structure includes a spring 15 and a spring plate 16. The spring plate 16 abuts against the outer wall of the sealing ring, and the spring 15 is fixed between the spring plate 16 and the inner wall of the third oil scraper box 12. The spring plate 15 applies a pre-tightening force to the sealing ring.

[0022] By adopting the above technical solution, the spring 15 applies a continuous preload to the sealing ring through the spring plate 16, so that the sealing ring is always tightly attached to the outer wall of the piston rod 13. When the piston rod 13 vibrates or the pressure difference changes, the elastic deformation of the spring 15 can compensate for the gap between the sealing ring and the piston rod 13 in real time, and prevent airflow from seeping in.

[0023] In this embodiment, the bottom of the second oil scraper box 18 is provided with an oil return port to discharge lubricating oil that accumulates at the bottom of the second oil scraper box 18 and may affect the radial movement of the floating sealing groove 19.

[0024] By adopting the above technical solution, the lubricating oil scraped by the radial floating oil scraper ring assembly 17 may seep into the gap between the oil scraper box and the floating sealing groove 19 and accumulate at the bottom of the second oil scraper box 18. The oil return port can discharge this lubricating oil back to the crosshead chamber in time, so as to avoid the accumulation of lubricating oil causing the floating sealing groove 19 to get stuck and affecting its radial compensation function.

[0025] In this embodiment, the floating sealing groove 19 is further configured to be made of a non-metallic wear-resistant material, including PEEK material and PTFE material.

[0026] In this embodiment, the number of radial floating oil scraper ring groups 17 is two or more, and the multiple radial floating oil scraper ring groups 17 are axially spaced in the oil scraper box along the piston rod 13.

[0027] This embodiment is further configured to include a pressure cap 3, which is disposed at the end of the first oil scraper box 4 and is fixedly connected to the first oil scraper box 4 and the oil scraper flange 7 by the first bolt 2 and the nut 1.

[0028] In this embodiment, the second oil scraper box 18, the third oil scraper box 12 and the oil scraper flange 7 are connected by the second bolt 5.

[0029] In this embodiment, the oil scraper flange 7 is further configured to be connected to the compressor body by a third bolt 11.

[0030] In this embodiment, a first gasket 6 is provided between the oil scraper flange 7 and the third bolt 11, and a second gasket 9 is provided between the oil scraper flange 7 and the compressor body.

[0031] In this embodiment, the elastomer 20 can be replaced with an O-ring.

[0032] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly described below.

[0033] Example: Relying solely on the oil scraper ring assembly 8 using traditional methods is unlikely to achieve the desired effect. The oil scraper of this application operates in four parts: an oil-blocking ring 10, an oil scraper ring assembly 8, a radially floating oil scraper ring assembly 17, and a sealing ring assembly 14 with a spring 15. When the high-speed piston rod 13 moves to the left, the oil-blocking ring 10 first blocks a portion of the lubricating oil, and then the oil scraper ring assembly 8 scrapes the oil. The lubricating oil scraped off the piston rod 13 returns to the crosshead chamber along the direction of the arrow through the lubricating oil channels between the oil scraper ring assemblies 8. Even after passing through the oil scraper ring assembly 8, some lubricating oil remains on the outer surface of the piston rod 13 without being scraped. The lubricating oil needs to be scraped again by the radial floating oil scraping ring assembly 17. The seal 21 tightly hugs the piston rod 13 according to the deformation of the elastomer 20, thus having an oil scraping function. When the piston rod 13 vibrates violently or sinks, the radially floating sealing groove 19 can overcome the disadvantage of the small radial compensation distance of the elastomer 20 caused by the violent vibration and sinking of the piston rod 13. The oil return port set at the bottom of the second oil scraping box 18 facilitates the discharge of lubricating oil that enters the bottom of the second oil scraping box 18 through the gap between the second oil scraping box 18 and the floating sealing groove 19, so as to avoid affecting the radial movement of the floating sealing groove 19.

[0034] At the same time, while setting two sealing rings in the sealing ring assembly 14, adding spring 15 and spring plate 16 improves the sealing effect of the sealing ring assembly 14. The improved sealing effect will also improve the oil scraper's return function, preventing airflow from the pressure difference between the two compartments from affecting the normal return of lubricating oil.

[0035] The radial floating oil scraper ring assembly 17 of this application is a new structure of oil scraper for a horizontal reciprocating high-speed compressor. The radial compensation effect is improved by more than 200%, the oil scraping effect is safe and reliable, it is not limited by piston speed, and the efficiency of equipment is improved.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency reciprocating compressor oil scraper, characterized in that, The system includes an oil scraper flange (7), on which a first oil scraper box (4) and a second oil scraper box (18) are respectively provided on both sides. A third oil scraper box (12) is provided on the side of the second oil scraper box (18) away from the oil scraper flange (7). An oil scraping assembly is provided in the first oil scraper box (4), the second oil scraper box (18), and the third oil scraper box (12). The oil scraping assembly includes, in sequence along the axial direction of the piston rod (13): An oil-blocking ring (10) is disposed in the first oil scraper box (4) to initially block the lubricating oil on the piston rod (13); The oil scraper ring assembly (8) is located in the first oil scraper box (4) and is used to scrape off the lubricating oil on the piston rod (13). It is also provided with a lubricating oil channel to allow the scraped lubricating oil to flow back to the crosshead chamber. A radial floating scraper ring assembly (17) is disposed in the second scraper box (18) for further scraping off residual lubricating oil. The radial floating scraper ring assembly (17) includes a floating sealing groove (19) that can be radially floatingly installed in the second scraper box (18), an elastic body (20) disposed in the floating sealing groove (19), and a sealing element (21) that is pushed by the elastic body (20) and tightly held on the piston rod (13). The sealing ring assembly (14) is disposed in the third oil scraper box (12) and includes at least two sealing rings and a pre-tightening structure.

2. The high-efficiency reciprocating compressor oil scraper according to claim 1, characterized in that, The pre-tightening structure includes a spring (15) and a spring plate (16). The spring plate (16) abuts against the outer wall of the sealing ring. The spring (15) is fixed between the spring plate (16) and the inner wall of the third oil scraper box (12). The spring plate (16) applies a pre-tightening force to the sealing ring.

3. The high-efficiency reciprocating compressor oil scraper according to claim 1, characterized in that, The bottom of the second oil scraper box (18) is provided with an oil return port for draining lubricating oil that accumulates at the bottom of the second oil scraper box (18) and may affect the radial movement of the floating sealing groove (19).

4. A high-efficiency reciprocating compressor oil scraper according to claim 1, characterized in that, The floating sealing groove (19) is made of non-metallic wear-resistant materials, including PEEK and PTFE materials.

5. A high-efficiency reciprocating compressor oil scraper according to claim 1, characterized in that, The number of radial floating oil scraper ring groups (17) is two or more, and the multiple radial floating oil scraper ring groups (17) are axially spaced in the oil scraper box along the piston rod (13).

6. A high-efficiency reciprocating compressor oil scraper according to claim 1, characterized in that, It also includes a pressure cap (3), which is disposed at the end of the first oil scraper box (4) and is fixedly connected to the first oil scraper box (4) and the oil scraper flange (7) by a first bolt (2) and a nut (1).

7. A high-efficiency reciprocating compressor oil scraper according to claim 1, characterized in that, The second oil scraper box (18), the third oil scraper box (12), and the oil scraper flange (7) are connected by the second bolt (5).

8. A high-efficiency reciprocating compressor oil scraper according to claim 1, characterized in that, The oil scraper flange (7) is connected to the compressor body by a third bolt (11).

9. A high-efficiency reciprocating compressor oil scraper according to claim 8, characterized in that, A first gasket (6) is provided between the oil scraper flange (7) and the third bolt (11), and a second gasket (9) is provided between the oil scraper flange (7) and the compressor body.

10. A high-efficiency reciprocating compressor oil scraper according to claim 1, characterized in that, The elastomer (20) can be replaced with an O-ring.

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