Improved oil wiper structure of piston compressor

Abstract

The utility model discloses an improved oil scraper structure of a piston compressor, belongs to the technical field of piston compressor sealing, and aims to solve the problems that the oil scraping effect of an oil scraping ring is poor when an existing refrigerator compressor operates, carbon deposition viscous materials are formed in an air cylinder for a long time, and the operating efficiency of the refrigerator compressor is affected. The oil scraper structure comprises two oil scraping units, an oil scraping flange and an oil blocking unit, the two oil scraping units are sequentially arranged on one side of the oil scraping flange, the oil blocking unit is arranged on the other side of the oil scraping flange, and the two oil scraping units, the oil scraping flange and the oil blocking unit are coaxially arranged. The two oil scraping units and the oil blocking unit are detachably connected with the oil scraping flange, the oil scraping flange is detachably connected with the piston compressor shell, the oil scraping unit close to the oil scraping flange is the rear oil scraping unit, and the oil scraping unit far away from the oil scraping flange is the front oil scraping unit. The oil scraper structure is mainly used for scraping oil on the outer wall of the piston rod in the piston compressor.

Description

Technical Field

[0001] The utility model relates to the technical field of piston compressor sealing, in particular to an improved piston compressor oil scraper structure. Background Art

[0002] When the existing refrigerant compressor is shut down for maintenance, it is found that there is oil pollution in the gap between the compressor piston rod and the sealing packing, which leads to excessive leakage of refrigerant from the packing seal, resulting in increased refrigerant consumption and increased operating costs. The reason for this situation is that the first-stage exhaust valve and the second-stage exhaust valve of the compressor are polluted by a large amount of tar-like carbon deposits, and the pollution extends to exhaust pipes at all levels and cooler-related pipe equipment. The main reason is that the lubricating oil (steam) enters the cylinder through the piston rod and encounters a mixture of carbon deposits and oil generated by the high-temperature refrigerant in the cylinder. The scraper ring of the existing refrigerant compressor has a poor oil scraping effect when it is running, resulting in a small amount of lubricating oil being transmitted to the middle connecting cylinder with the reciprocating motion of the piston rod, part of which is discharged at the bottom, and part of which forms an oil film / oil vapor and enters the cylinder with the piston rod. In the long run, over time, carbon deposits and viscous substances will be formed in the cylinder. Therefore, it is very practical to develop an improved piston compressor oil scraper structure to address the above problems. Utility Model Content

[0003] The utility model aims to solve the problem that the scraper ring of the existing refrigerator compressor has poor oil scraping effect during operation, and in the long run, carbon deposits and viscous substances will be formed in the cylinder, which will affect the operating efficiency of the refrigerator compressor, and thus provide an improved piston compressor oil scraper structure;

[0004] An improved piston compressor oil scraper structure, the oil scraper structure comprising two oil scraper units, an oil scraper flange and an oil blocking unit, the two oil scraper units are sequentially arranged on one side of the oil scraper flange, the oil blocking unit is arranged on the other side of the oil scraper flange, and the two oil scraper units, the oil scraper flange and the oil blocking unit are coaxially arranged, the two oil scraper units and the oil blocking unit are detachably connected to the oil scraper flange, the oil scraper flange is detachably connected to the piston compressor housing, the rear oil scraper unit is arranged close to the oil scraper flange, and the front oil scraper unit is arranged away from the oil scraper flange;

[0005] Furthermore, a No. 1 sealing gasket is provided between the two oil scraping units, and a No. 2 sealing gasket is provided between the oil scraping unit close to the oil scraping flange and the oil scraping flange;

[0006] Furthermore, a No. 3 sealing gasket is provided between the oil blocking unit and the oil scraping flange;

[0007] Furthermore, the oil scraper unit comprises an oil scraper ring group, an oil scraper box and two No. 1 tension springs, the oil scraper ring group is arranged in the oil scraper box, the oil scraper ring group comprises two oil scraper rings, the two oil scraper rings are fixedly connected by a plurality of cylindrical pins, a No. 1 tension spring is sleeved on the outer circumferential surface of each oil scraper ring, and each oil scraper ring is mounted on the inner wall of the oil scraper box through the No. 1 tension spring;

[0008] Furthermore, a No. 4 sealing gasket is attached to the contact surface of the oil scraper flange close to one end of the piston compressor housing, and a plurality of threaded holes are evenly distributed at the connection between the piston compressor housing and the oil scraper flange. The oil scraper flange is detachably connected to the piston compressor housing through a plurality of connecting bolts;

[0009] Further, the oil blocking unit comprises an oil blocking box, a No. 2 tension spring and an oil blocking ring, wherein the oil blocking ring is arranged in the oil blocking box, a No. 2 tension spring is mounted on the outer circumferential surface of the oil blocking ring, and the oil blocking ring is mounted on the inner wall of the oil blocking box through the No. 2 tension spring;

[0010] Furthermore, a gap is provided between the oil blocking ring and the oil blocking box, the spacing of the gap is H1, and the value range of H1 is 0.1mm to 0.15mm;

[0011] Furthermore, the inner ring wall of the oil blocking ring is processed into a double-sided blade shape, and the single-sided blade is set at an acute angle of 35° to 60° with the piston axis;

[0012] Furthermore, a No. 1 oil guide hole and a No. 2 oil guide hole are processed inside the oil scraper flange, one end of the No. 1 oil guide hole is connected to the inner cavity of the oil scraper flange, the other end of the No. 1 oil guide hole is connected to the oil return cavity, one end of the No. 2 oil guide hole is connected to the oil blocking box, and the other end of the No. 2 oil guide hole is connected to the oil return cavity;

[0013] Furthermore, the oil scraper structure also includes multiple mounting components, and the two oil scraper units, the oil scraper flange and the oil blocking unit are detachably connected through multiple mounting components, and the mounting components include a locking nut and a double-headed screw, one end of the double-headed screw passes through the oil blocking box, the oil scraper flange, and the oil scraper box in the rear oil scraper unit in sequence and is inserted into the oil scraper box in the front oil scraper unit, and one end of the double-headed screw is threadably connected to the oil scraper box in the front oil scraper unit, the locking nut is arranged on the end of the oil blocking box away from the oil scraper flange, and the locking nut is sleeved on the other end of the double-headed screw, and the locking nut is threadably connected to the double-headed screw.

[0014] The beneficial effects of this application compared to the prior art are as follows:

[0015] The improved piston compressor oil scraper structure proposed in the present application changes the arrangement position of the oil blocking ring and the oil blocking box compared to the traditional piston compressor oil scraper structure, moves the whole composed of the oil blocking ring and the oil blocking box to the other side of the oil scraper flange, and optimizes the structure of the oil blocking ring, changes the original square cross section into a double-sided blade cross section, the purpose of which is to rely on the sharp cutting surface to remove the oil film on the piston rod, and the integrated droplets flow into the lower oil guide hole, and at the same time adjust the gap between the oil blocking ring and the oil blocking box, and optimize the gap spacing from 0.05mm to 0.1mm to 0.1mm to 0.15mm, the purpose of which is to allow the blocking ring to have a larger space to avoid being stuck by the oil film and losing the deformation and tightening ability, so that the blocking ring can always tightly clamp the piston rod under the action of the tension spring to enhance the isolation effect;

[0016] In actual applications, the oil scraper structure provided by the present application has significantly improved oil separation effect, significantly reduced oil consumption, and reduced oil replenishment at gas stations from 50 kg per month to 50 kg per quarter. At the same time, after optimization of the oil scraper structure, carbon deposits in the cylinder are significantly reduced, and the symptoms are alleviated. The sticky carbon deposits that were originally difficult to clean can still be removed after a maintenance cycle (6 months), but the thickness is reduced and the deposits are dry and can be wiped off with a rag. In addition, the present application has a simple structure, is easy to use, and has relatively low manufacturing and improvement costs, making it more suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a main cross-sectional schematic diagram of the oil scraper structure described in this application;

[0018] Figure 2 It is a right side schematic diagram of the oil scraper structure described in this application;

[0019] Figure 3 for Figure 1 A partial enlarged view of the middle A;

[0020] In the figure, 1 is an oil scraper ring, 2 is a tension spring No. 1, 3 is an oil scraper box, 4 is a sealing gasket No. 1, 5 is a sealing gasket No. 2, 6 is an oil scraper flange, 61 is an oil guide hole No. 1, 62 is an oil guide hole No. 2, 7 is a sealing gasket No. 4, 8 is a connecting bolt, 9 is a sealing gasket No. 3, 10 is an oil block box, 11 is a locking nut, 12 is a stud screw, 13 is a tension spring No. 2 and 14 is an oil block ring. DETAILED DESCRIPTION

[0021] Specific implementation method 1: Combination Figures 1 to 3The present embodiment is described. In the present embodiment, an improved piston compressor oil scraper structure is provided, and the oil scraper structure includes two oil scraper units, an oil scraper flange 6 and an oil-blocking unit, and is characterized in that: the two oil scraper units are sequentially arranged on one side of the oil scraper flange 6, and the oil-blocking unit is arranged on the other side of the oil scraper flange 6, and the two oil scraper units, the oil scraper flange 6 and the oil-blocking unit are coaxially arranged, the two oil scraper units and the oil-blocking unit are detachably connected to the oil scraper flange 6, and the oil scraper flange 6 is detachably connected to the piston compressor housing, and the two oil scraper units are arranged close to the oil scraper flange 6 as the rear oil scraper unit, and the oil scraper unit is arranged away from the oil scraper flange 6 as the front oil scraper unit.

[0022] The present application moves the oil-blocking unit from the position between the oil scraping unit and the oil scraping flange 6 to the other side of the oil scraping flange 6: its purpose is that the existing oil-blocking unit and the oil scraping unit are squeezed together without any interval, and an effective space cannot be formed. After the change, the original single-sided arrangement is optimized to a two-sided arrangement, and the working area is changed from 1 to 2 areas, which provides a larger working space for the oil scraping unit and avoids the occurrence of oil film sticking.

[0023] Specific implementation method 2: Combination Figures 1 to 3 This embodiment is described. The difference between this embodiment and the first embodiment is that a first sealing gasket 4 is provided between the two scraper units, and a second sealing gasket 5 is provided between the scraper unit close to the scraper flange 6 and the scraper flange 6. Other components and connection methods are the same as those of the first embodiment.

[0024] Specific implementation method three: Combination Figures 1 to 3 This embodiment is described. The difference between this embodiment and the second embodiment is that a third sealing gasket 9 is provided between the oil blocking unit and the oil scraping flange 6. The other components and connection methods are the same as those of the second embodiment.

[0025] In combination with the description of the second and third embodiments, the functions of the No. 1 sealing gasket 4, the No. 2 sealing gasket 5 and the No. 3 sealing gasket 9 are all to improve the overall sealing performance of the device to avoid oil leakage.

[0026] Specific implementation method four: Combination Figures 1 to 3 This embodiment is described. The difference between this embodiment and the third embodiment is that the oil scraper unit includes an oil scraper ring group, an oil scraper box 3 and two No. 1 tension springs 2. The oil scraper ring group is arranged in the oil scraper box 3. The oil scraper ring group includes two oil scraper rings 1, which are fixedly connected by a plurality of cylindrical pins. A No. 1 tension spring 2 is mounted on the outer circumference of each oil scraper ring 1, and each oil scraper ring 1 is mounted on the inner wall of the oil scraper box 3 through the No. 1 tension spring 2. Other components and connection methods are the same as those of the third embodiment.

[0027] Specific implementation method five: Combination Figures 1 to 3This embodiment is described. The difference between this embodiment and the fourth embodiment is that a fourth sealing gasket 7 is attached to the contact surface of the oil scraper flange 6 close to one end of the piston compressor housing, a plurality of threaded holes are evenly distributed at the connection between the piston compressor housing and the oil scraper flange 6, and the oil scraper flange 6 is detachably connected to the piston compressor housing through a plurality of connecting bolts 8. The other components and connection methods are the same as those of the fourth embodiment.

[0028] Specific implementation method six: Combination Figures 1 to 3 This embodiment is described. The difference between this embodiment and the fifth embodiment is that the oil blocking unit includes an oil blocking box 10, a second tension spring 13 and an oil blocking ring 14. The oil blocking ring 14 is arranged in the oil blocking box 10. A second tension spring 13 is mounted on the outer circumferential surface of the oil blocking ring 14. The oil blocking ring 14 is installed on the inner wall of the oil blocking box 10 through the second tension spring 13. The other components and connection methods are the same as those in the fifth embodiment.

[0029] Specific implementation method seven: Combination Figures 1 to 3 This embodiment is described. The difference between this embodiment and the sixth embodiment is that a gap is provided between the oil blocking ring 14 and the oil blocking box 10. The spacing of the gap is H1, and the value range of H1 is 0.1mm to 0.15mm. Other components and connection methods are the same as those of the sixth embodiment.

[0030] Specific implementation method eight: Combination Figures 1 to 3 This embodiment is different from the seventh embodiment in that the inner ring wall of the oil blocking ring 14 is processed into a double-sided blade shape, and the single-sided blade is set at an acute angle of 35° to 60° with the piston axis. Other components and connection methods are the same as those of the seventh embodiment.

[0031] Specific implementation method nine: Combination Figures 1 to 3 This embodiment is described. The difference between this embodiment and the specific embodiment eight is that the oil scraper flange 6 is processed with a first oil guide hole 61 and a second oil guide hole 62. One end of the first oil guide hole 61 is connected to the inner cavity of the oil scraper flange 6, and the other end of the first oil guide hole 61 is connected to the oil return cavity. One end of the second oil guide hole 62 is connected to the oil blocking box 10, and the other end of the second oil guide hole 62 is connected to the oil return cavity. Other components and connection methods are the same as those of the specific embodiment eight.

[0032] In combination with the description of specific embodiments six to nine, the oil-blocking ring with an original square cross-section is changed to an oil-blocking ring with a double-sided blade cross-section, and the material of the oil-blocking ring 14 is upgraded from brass to lead brass. The purpose is to rely on the sharp cutting surface to remove the oil film on the piston rod, and the integrated droplets flow into the No. 2 oil guide hole 62. At the same time, the gap between the oil-blocking ring 14 and the oil-blocking box 10 is adjusted, and the gap spacing is optimized from 0.05mm~0.1mm to 0.1mm~0.15mm. The purpose is to allow the blocking ring to have a larger space to avoid being stuck by the oil film and losing its deformation and tightening ability, so that the blocking ring can always tightly clamp the piston rod under the action of the tensioning spring to enhance the isolation effect.

[0033] Specific implementation method ten: Combination Figures 1 to 3 This embodiment is described. The difference between this embodiment and the ninth embodiment is that the oil scraper structure also includes a plurality of mounting components. The two oil scraper units, the oil scraper flange 6 and the oil blocking unit are detachably connected through a plurality of mounting components. The mounting components include a locking nut 11 and a double-headed screw 12. One end of the double-headed screw 12 passes through the oil blocking box 10, the oil scraper flange 6, the oil scraper box 3 in the rear oil scraper unit in sequence and is inserted into the oil scraper box 3 in the front oil scraper unit. One end of the double-headed screw 12 is threadedly detachably connected to the oil scraper box 3 in the front oil scraper unit. The locking nut 11 is provided on the end of the oil blocking box 10 away from the oil scraper flange 6, and the locking nut 11 is sleeved on the other end of the double-headed screw 12. The locking nut 11 is threadedly detachably connected to the double-headed screw 12. Other components and connection methods are the same as those of the ninth embodiment.

[0034] The present invention has been disclosed as above with preferred implementation cases, but it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent implementation cases with equivalent changes by using the above-disclosed structures and technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above implementation cases based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

[0035] How it works

[0036] When the present application is in use, first assemble the various components together according to the connections described in Specific Embodiments 1 to Specific Embodiments 10. As the piston drives the oil to reciprocate in the cavity, the oil scraper unit located on the front side of the scraper flange 6 first performs a preliminary cleaning of the oil on the piston rod. The oil that has not been cleaned by the scraper unit enters the scraper flange 6 and flows into the inner cavity of the scraper flange 6, and flows into the reflux chamber along the No. 1 oil guide hole 61 for reuse. At this time, the last oil film attached to the piston rod passes through the oil blocking unit and is removed by the sharp cutting surface of the oil blocking ring 14. The cleaned oil film flows into the No. 2 oil guide hole 62 through the gap between the oil blocking ring 14 and the oil blocking box 10, and flows into the No. 2 oil guide hole 62 along the No. 2 oil guide hole 62 for reuse.

Claims

1. An improved piston compressor oil scraper structure, the oil scraper structure comprising two oil scraper units, an oil scraper flange (6) and an oil blocking unit, characterized in that: The two oil scraping units are sequentially arranged on one side of the oil scraping flange (6), and the oil blocking unit is arranged on the other side of the oil scraping flange (6). The two oil scraping units, the oil scraping flange (6) and the oil blocking unit are coaxially arranged. The two oil scraping units and the oil blocking unit are detachably connected to the oil scraping flange (6). The oil scraping flange (6) is detachably connected to the piston compressor housing. Of the two oil scraping units, the one arranged closer to the oil scraping flange (6) is the rear oil scraping unit, and the one arranged farther from the oil scraping flange (6) is the front oil scraping unit.

2. An improved piston compressor oil scraper structure according to claim 1, characterized in that: A first sealing gasket (4) is arranged between the two oil scraping units, and a second sealing gasket (5) is arranged between the oil scraping unit close to the oil scraping flange (6) and the oil scraping flange (6).

3. An improved piston compressor oil scraper structure according to claim 2, characterized in that: A No. 3 sealing gasket (9) is provided between the oil blocking unit and the oil scraping flange (6).

4. An improved piston compressor oil scraper structure according to claim 3, characterized in that: The oil scraper unit comprises an oil scraper ring group, an oil scraper box (3) and two No. 1 tension springs (2); the oil scraper ring group is arranged in the oil scraper box (3); the oil scraper ring group comprises two oil scraper rings (1); the two oil scraper rings (1) are fixedly connected via a plurality of cylindrical pins; a No. 1 tension spring (2) is mounted on the outer circumferential surface of each oil scraper ring (1); and each oil scraper ring (1) is mounted on the inner wall of the oil scraper box (3) via the No. 1 tension spring (2).

5. An improved piston compressor oil scraper structure according to claim 4, characterized in that: A No. 4 sealing gasket (7) is attached to the contact surface of the oil scraper flange (6) close to one end of the piston compressor housing, and a plurality of threaded holes are evenly distributed at the connection between the piston compressor housing and the oil scraper flange (6). The oil scraper flange (6) is detachably connected to the piston compressor housing via a plurality of connecting bolts (8).

6. An improved piston compressor oil scraper structure according to claim 5, characterized in that: The oil-blocking unit comprises an oil-blocking box (10), a No. 2 tensioning spring (13) and an oil-blocking ring (14); the oil-blocking ring (14) is arranged in the oil-blocking box (10); a No. 2 tensioning spring (13) is sleeved on the outer circumferential surface of the oil-blocking ring (14); and the oil-blocking ring (14) is installed on the inner wall of the oil-blocking box (10) via the No. 2 tensioning spring (13).

7. An improved piston compressor oil scraper structure according to claim 6, characterized in that: A gap is provided between the oil blocking ring (14) and the oil blocking box (10), the spacing of the gap is H1, and the value range of H1 is 0.1 mm to 0.15 mm.

8. An improved piston compressor oil scraper structure according to claim 7, characterized in that: The inner ring wall of the oil blocking ring (14) is processed into a double-sided blade shape, and the single-sided blade is arranged at an acute angle of 35° to 60° with the piston axis.

9. An improved piston compressor oil scraper structure according to claim 8, characterized in that: The oil scraper flange (6) is internally processed with a first oil guide hole (61) and a second oil guide hole (62); one end of the first oil guide hole (61) is connected to the inner cavity of the oil scraper flange (6), and the other end of the first oil guide hole (61) is connected to the oil return cavity; one end of the second oil guide hole (62) is connected to the oil blocking box (10), and the other end of the second oil guide hole (62) is connected to the oil return cavity.

10. An improved piston compressor oil scraper structure according to claim 9, characterized in that: The oil scraper structure also includes a plurality of mounting components, and the two oil scraper units, the oil scraper flange (6) and the oil blocking unit are detachably connected via the plurality of mounting components. The mounting components include a locking nut (11) and a double-headed screw (12), one end of the double-headed screw (12) sequentially passes through the oil blocking box (10), the oil scraper flange (6), and the oil scraper box (3) in the rear oil scraper unit and is inserted into the oil scraper box (3) in the front oil scraper unit, and one end of the double-headed screw (12) is threadedly detachably connected to the oil scraper box (3) in the front oil scraper unit, the locking nut (11) is arranged on one end of the oil blocking box (10) away from the oil scraper flange (6), and the locking nut (11) is sleeved on the other end of the double-headed screw (12), and the locking nut (11) is threadedly detachably connected to the double-headed screw (12).

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