Oil scraping assembly of reciprocating compressor

Abstract

An oil scraping assembly of a reciprocating compressor relates to the technical field of oil scraping structures and comprises a base ring, a framework oil seal is sleeved in one end of the base ring, and a sealing surface is arranged at one end, far away from the framework oil seal, of the base ring. The oil scraper ring solves the problems that in the prior art, due to long-term use of a metal oil scraper ring, a piston rod is seriously abraded, the service life is short, frequent leakage and leakage phenomena exist, normal production safety is seriously affected, the price is high, and the production cost is increased.

Description

Technical Field

[0001] The invention relates to the technical field of oil scraping structures, in particular to an oil scraping assembly of a reciprocating compressor. Background Art

[0002] Oil scraper rings are mainly used in piston compressors. They act on the piston rod to prevent the lubricating oil in the crankcase from being brought out by the piston rod when the piston rod moves. Most common scraper rings are made of tin bronze. The sharp blade of the scraper ring is used to scrape off the lubricating oil adhering to the piston rod. The scraper ring is installed through the window of the socket and has high requirements for installation accuracy and good fit with the piston rod.

[0003] The prior art discloses a patent with a publication number of CN106438289A, which includes an oil scraper shell mounted on a piston rod, a gland is provided on one side of the oil scraper shell, and a pair of sealing rings, multiple pairs of oil scraper rings and spacer rings are provided between the gland and the inner end surface of the piston rod on one side of the oil scraper shell; the sealing ring is made of carbon fiber, and the oil scraper ring is made of copper alloy. Compared with the prior art, the present invention can solve the problem of large amount of oil blowby in the existing cylinder.

[0004] As the existing devices are used, the shortcomings of the technology are gradually exposed, mainly in the following aspects:

[0005] Long-term use of metal scraper rings causes great wear on the piston rod, has a short service life, and often causes leakage, which seriously affects normal production safety. In addition, the metal scraper rings are expensive, which increases production costs.

[0006] As can be seen from the above, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0007] In view of the defects in the prior art, the present invention provides a reciprocating compressor oil scraper assembly to solve the problems of the metal oil scraper ring in the traditional technology causing large wear on the piston rod due to long-term use, short service life, frequent leakage, which seriously affects normal production safety, and high price, which increases production costs.

[0008] To achieve the above object, the present invention provides the following technical solutions.

[0009] The reciprocating compressor oil scraping assembly comprises a base ring, one end of the base ring is sleeved with a skeleton oil seal, and the end of the base ring away from the skeleton oil seal is provided with a sealing surface.

[0010] As an optimized solution, a plurality of buffer grooves are provided along the center circumference of the sealing surface.

[0011] As an optimized solution, the buffer groove is a cylindrical groove, and the axis of the buffer groove is parallel to the axis of the base ring.

[0012] As an optimized solution, the inner ring of the base ring and the outer ring of the skeleton oil seal are interference fit.

[0013] As an optimized solution, a cartridge column is detachably connected in one of the buffer grooves.

[0014] As an optimized solution, a diameter-reducing limiting section is provided in the inner hole of the base ring close to the sealing surface.

[0015] As an optimized solution, one end of the skeleton oil seal abuts against the reduced diameter limiting section.

[0016] As an optimized solution, the other end of the skeleton oil seal is located inside the inner hole of the base ring.

[0017] As an optimized solution, the skeleton oil seal is a fluororubber oil seal.

[0018] As an optimized solution, the base ring is a filled polytetrafluoroethylene-based ring.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] By using a skeleton oil seal to replace the metal scraper ring in the traditional technology, the problem of the metal scraper ring causing great wear on the piston rod due to long-term use can be overcome; by arranging a base ring on the outside of the skeleton oil seal for use in conjunction, the sealing surface can be used to achieve the sealing effect of the traditional metal scraper ring;

[0021] The skeleton oil seal is a fluorine rubber oil seal, and the base ring is a polytetrafluoroethylene-filled ring, which has low cost and is much lower than the traditional tin bronze metal scraper ring. The scraper assembly can float freely with the reciprocating motion of the piston rod under the premise of being fully fitted with the piston rod, so as to achieve good scraper performance.

[0022] By opening a buffer groove on the sealing surface, the axial impact force is weakened, the buffering effect is achieved, and the lubricating oil is prevented from sticking and weakening the lubricating oil pumping effect.

[0023] By inserting a plug-in column into one of the buffer grooves, two adjacent oil scraping assemblies can be used in pairs by using the plug-in column. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0025] Figure 1It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a schematic structural diagram of the annular liquid collecting tank of the present invention.

[0027] In the figure: 1-base ring; 2-skeleton oil seal; 3-reduction limit section; 4-buffer groove; 5-sealing surface; 6-annular liquid collecting groove; 7-guide groove. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0029] like Figure 1 and Figure 2 As shown, the reciprocating compressor oil scraper assembly comprises a base ring 1, a skeleton oil seal 2 is sleeved inside one end of the base ring 1, and a sealing surface 5 is provided at the end of the base ring 1 away from the skeleton oil seal 2.

[0030] A plurality of buffer grooves 4 are arranged on the sealing surface 5 along the center.

[0031] The buffer groove 4 is a cylindrical groove, and the axis of the buffer groove 4 is parallel to the axis of the base ring 1 .

[0032] The inner ring of the base ring 1 and the outer ring of the skeleton oil seal 2 are interference fit.

[0033] A plug-in column is detachably connected in one of the buffer grooves 4 .

[0034] The inner hole of the base ring 1 close to the sealing surface 5 is provided with a reduced diameter limiting section 3 .

[0035] One end of the skeleton oil seal 2 abuts against the diameter-reducing limiting section 3 .

[0036] The other end of the skeleton oil seal 2 is located inside the inner hole of the base ring 1 .

[0037] The skeleton oil seal 2 is a fluorine rubber oil seal.

[0038] The base ring 1 is a ring 1 filled with polytetrafluoroethylene.

[0039] The sealing surface 5 of the base ring 1 is surrounded by two sections of liquid guiding areas, and the buffer groove 4 is arranged on the sealing surface between the two sections of liquid guiding areas;

[0040] Each liquid guide area includes a plurality of annular liquid collecting grooves 6 which are sequentially opened on the sealing surface 5 from the outside to the inside. The annular liquid collecting grooves 6 can be used to achieve that when the sealing surface 5 and the end surface of the shell are sealed against each other, if there is oil between the sealing surface 5 and the end surface of the shell, the fit between the sealing surface 5 and the end surface of the shell is affected. By providing the annular liquid collecting grooves 6, the oil between the extrusion surfaces can be introduced into the annular liquid collecting grooves 6 to ensure the fit between the sealing surface 5 and the end surface of the shell.

[0041] The sealing surface 5 between two adjacent annular liquid collecting grooves 6 is provided with an annular support portion with an arc-shaped cross-section, and a plurality of radially opened guide grooves 7 are provided on the annular support portion. The guide grooves 7 can be used to achieve that when the sealing surface 5 is in contact with the end surface of the shell, the oil between the extrusion surfaces can be quickly introduced into the annular liquid collecting groove 6 along the guide grooves 7, thereby further improving the fit between the sealing surface 5 and the end surface of the shell.

[0042] The working principle of this device is:

[0043] By using the skeleton oil seal 2 to replace the metal scraper ring in the traditional technology, the problem of the metal scraper ring causing great wear on the piston rod due to long-term use can be overcome; by arranging the base ring 1 outside the skeleton oil seal 2 for matching use, the sealing surface 5 can be used to achieve the sealing effect of the traditional metal scraper ring;

[0044] The skeleton oil seal 2 is a fluorine rubber oil seal, and the base ring 1 is a polytetrafluoroethylene-filled ring 1, which has low cost and is much lower than the traditional tin bronze metal scraper ring. The scraper assembly can float freely with the reciprocating motion of the piston rod under the premise of being fully fitted with the piston rod, so as to achieve good scraper performance;

[0045] By providing the buffer groove 4 on the sealing surface 5, the axial impact force is weakened, the buffering effect is achieved, and the lubricating oil is prevented from adhering to and weakening the lubricating oil pumping effect.

[0046] By inserting a plug-in column into one of the buffer grooves 4, two adjacent oil scraping assemblies can be used in pairs by using the plug-in column.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A reciprocating compressor oil scraper assembly, characterized in that: It comprises a base ring (1), one end of which is internally sleeved with a skeleton oil seal (2), and one end of the base ring (1) away from the skeleton oil seal (2) is provided with a sealing surface (5).

2. The reciprocating compressor oil scraper assembly according to claim 1, characterized in that: A plurality of buffer grooves (4) are arranged around the center of the sealing surface (5).

3. The reciprocating compressor oil scraper assembly according to claim 2, characterized in that: The buffer groove (4) is a cylindrical groove, and the axis of the buffer groove (4) is parallel to the axis of the base ring (1).

4. The reciprocating compressor oil scraper assembly according to claim 3, characterized in that: The inner ring of the base ring (1) and the outer ring of the skeleton oil seal (2) are interference fit.

5. The reciprocating compressor oil scraper assembly according to claim 4, characterized in that: A plug-in column is detachably connected in one of the buffer grooves (4).

6. The reciprocating compressor oil scraper assembly according to claim 5, characterized in that: The inner hole of the base ring (1) close to the sealing surface (5) is provided with a reduced diameter limiting section (3).

7. The reciprocating compressor oil scraper assembly according to claim 6, characterized in that: One end of the skeleton oil seal (2) abuts against the diameter-reducing limiting section (3).

8. The reciprocating compressor oil scraper assembly according to claim 7, characterized in that: The other end of the skeleton oil seal (2) is located inside the inner hole of the base ring (1).

9. The reciprocating compressor oil scraper assembly according to claim 8, characterized in that: The skeleton oil seal (2) is a fluororubber oil seal.

10. The reciprocating compressor oil scraper assembly according to claim 9, characterized in that: The base ring (1) is a filled polytetrafluoroethylene-based ring (1).

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