Lubricating oil return structure of piston compressor

Abstract

The utility model relates to the technical field of compressors, in particular to a lubricating oil return structure of a piston type compressor, which comprises a rotating shaft, and a swash plate, two plane bearings and two needle bearings which are sleeved on the rotating shaft, the two plane bearings abut against the two end faces of the swash plate correspondingly, and the two needle bearing sleeves are arranged at the two ends of the rotating shaft correspondingly. The rotating shaft is provided with oil outlet holes and an oil outlet channel, the rotating shaft extends from the middle of the end face facing the oil inlet cavity to the other end face to form the oil outlet channel, the oil outlet channel is arranged in the axis direction of the rotating shaft, the multiple oil outlet holes are located in the outer shaft face of the rotating shaft, and the oil outlet holes communicate with the oil outlet channel. And each oil outlet hole is arranged corresponding to a plane bearing or a needle bearing. Lubricating oil can directly reach the plane bearing and the needle bearing from the oil outlet channel through the oil outlet holes, the lubricating and cooling effects are improved, and the working performance is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a lubrication oil return structure of a piston compressor. Background Art

[0002] A piston compressor is a machine that compresses gas by reciprocating motion of a piston in a cylinder. It is one of the most commonly used types of compressors in industry and is widely used in the compression of various gases. It has the characteristics of simple structure, easy operation and strong adaptability.

[0003] During operation, a large amount of heat is generated due to the high-speed movement of the piston and the rotating shaft. The flow of lubricating oil inside the compressor forms a lubrication and cooling effect to ensure the efficient and stable operation of the compressor. In the related technology, oil outlet holes corresponding to the slewing bearings on both sides of the swash plate are usually arranged on the outer side surface of the rotating shaft. During the rotation of the rotating shaft, the lubricating oil can be thrown out through the oil outlet holes to lubricate and cool the slewing bearings. However, during operation, the two ends of the rotating shaft are rotatably connected to the compressor casing, and the distance between the rotating connection position and the oil outlet hole is relatively far. It is difficult for the lubricating oil to reach the rotating connection position with the rotation of the rotating shaft, and it is difficult to ensure the lubrication and cooling effect, thereby affecting the overall working performance of the compressor.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes the prior art known to those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a lubrication oil return structure for a piston compressor to improve the lubrication and cooling effects when the compressor is working.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a piston compressor lubrication oil return structure, comprising: a rotating shaft and a swash plate, a plane bearing and a needle roller bearing sleeved on the rotating shaft, the swash plate is located in the middle of the rotating shaft, two plane bearings and two needle roller bearings are provided, the two plane bearings are respectively abutted against the two end surfaces of the swash plate, and the two needle roller bearing sleeves are respectively provided at the two ends of the rotating shaft;

[0007] Among them, the rotating shaft is provided with an oil outlet hole and an oil outlet channel. The rotating shaft extends from the middle of the end face facing the oil inlet chamber toward the other end face to form the oil outlet channel, and the oil outlet channel is arranged in the axial direction of the rotating shaft. There are multiple oil outlet holes, which are located on the outer shaft surface of the rotating shaft, and the oil outlet holes are connected with the oil outlet channel. Each of the oil outlet holes is respectively arranged corresponding to the plane bearing or the needle roller bearing.

[0008] Furthermore, the bottom end of the oil outlet channel is arranged corresponding to the needle bearing far away from the oil inlet chamber.

[0009] Furthermore, an assembly section is provided on the outer axial surface in the middle of the rotating shaft, and the assembly section has teeth grooves evenly distributed along the circumference, each of the teeth grooves is arranged along the length direction of the rotating shaft, and the inclined plate is sleeved on the assembly section, and the inner side surface is arranged to fit the outer side surface of the teeth groove.

[0010] Furthermore, the shaft diameter of one end of the rotating shaft facing the oil inlet chamber is reduced to form a mounting section, and the outer shaft surface of the mounting section intersects with the side of the oil outlet hole to form a mounting surface, and the mounting surface is a plane.

[0011] Furthermore, it also includes a shell, which is hollow and forms a working chamber, the rotating shaft, the swash plate, the plane bearing and the needle bearing are all arranged in the working chamber, and the shell is coaxially arranged with the rotating shaft.

[0012] Furthermore, the shell includes a front section, a first middle section, a second middle section and a rear section connected in sequence, the working chamber is arranged in the first middle section and the second middle section, the two ends of the rotating shaft are respectively arranged in the front section and the rear section, and the mounting section is plugged in the rear section, and the end of the oil outlet channel is arranged opposite to the oil inlet chamber in the rear section.

[0013] Furthermore, baffles are provided between the front section and the first middle section and between the rear section and the second middle section. The baffles are sleeved on the outer axial surface of the rotating shaft and are abutted against the end surface of the needle bearing facing away from the swash plate.

[0014] Furthermore, the first middle section and the second middle section are hollowly arranged along the axial direction of the rotating shaft to form a plurality of assembly cavities, and the plurality of assembly cavities are symmetrically and evenly spaced around the center of the rotating shaft, and a piston is correspondingly assembled in each of the assembly cavities.

[0015] Furthermore, the number of the assembly chamber and the piston is five.

[0016] Furthermore, hemispheres are arranged on both side edges of the inclined plate, and the piston is provided with a ball socket and an inclined hole. The ball socket matches the hemisphere, and the inclined hole is arranged to pass through from the inner side surface of the piston toward the middle of the ball socket.

[0017] The beneficial effects of the utility model are as follows: by arranging oil outlet holes and oil outlet channels on the rotating shaft, the lubricating oil can directly reach the plane bearings and needle bearings that need lubrication from the oil outlet channels in the middle of the rotating shaft through the oil outlet holes, thereby improving the lubrication efficiency and effect, reducing the wear caused by uneven lubrication, ensuring that the key components in the compressor can obtain sufficient lubrication and cooling, and ensuring the overall working performance of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a structural schematic diagram of the lubrication oil return structure of the piston compressor in the embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the assembly of the rotating shaft in the embodiment of the utility model;

[0021] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0022] Figure 4 This is a schematic diagram of the structure of the rotating shaft in the embodiment of the utility model;

[0023] Figure 5 It is a side view of the housing in the embodiment of the utility model;

[0024] Figure 6 for Figure 5 Sectional view at the middle BB;

[0025] Figure 7 A side view of a piston in an embodiment of the utility model;

[0026] Figure 8 for Figure 7 Cross-sectional view at CC.

[0027] Figure numerals: 1, rotating shaft; 1a, oil outlet hole; 1b, oil outlet channel; 11, assembly section; 11a, tooth groove; 12, installation section; 12a, installation surface; 2, inclined plate; 3, plane bearing; 4, needle bearing; 5, housing; 5a, working chamber; 51, front section; 52, first middle section; 52a, assembly chamber; 53, second middle section; 54, rear section; 6, baffle; 7, piston; 7a, ball socket; 7b, inclined hole; 8, hemisphere. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] like Figures 1 to 8 The lubrication oil return structure of the piston compressor shown in the figure comprises: a rotating shaft 1 and a swash plate 2, a plane bearing 3 and a needle bearing 4 sleeved on the rotating shaft 1, the swash plate 2 is located in the middle of the rotating shaft 1, two plane bearings 3 and two needle bearings 4 are provided, the two plane bearings 3 are respectively abutted against the two end surfaces of the swash plate 2, and the two needle bearings 4 are respectively provided at the two ends of the rotating shaft 1;

[0032] Among them, the rotating shaft 1 is provided with an oil outlet hole 1a and an oil outlet channel 1b. The rotating shaft 1 extends from the middle of the end face facing the oil inlet chamber toward the other end face to form an oil outlet channel 1b, and the oil outlet channel 1b is arranged in the axial direction of the rotating shaft 1. There are multiple oil outlet holes 1a, which are located on the outer axial surface of the rotating shaft 1, and the oil outlet holes 1a are connected with the oil outlet channel 1b. Each oil outlet hole 1a is respectively arranged corresponding to a plane bearing 3 or a needle roller bearing 4.

[0033] The utility model provides an oil outlet hole 1a and an oil outlet channel 1b on the rotating shaft 1, so that the lubricating oil can directly reach the plane bearing 3 and the needle bearing 4 that need to be lubricated from the oil outlet channel 1b in the middle of the rotating shaft 1 through the oil outlet hole 1a, thereby improving the lubrication efficiency and effect, reducing the wear caused by uneven lubrication, ensuring that the key components in the compressor can obtain sufficient lubrication and cooling, and ensuring the overall working performance of the compressor.

[0034] On the basis of the above embodiment, the bottom end of the oil outlet channel 1b is arranged corresponding to the needle roller bearing 4 away from the oil inlet chamber, ensuring that the lubricating oil can directly reach the needle roller bearing 4, providing more effective lubrication and cooling, so that the lubricating oil can be evenly distributed to all needle roller bearings 4, avoiding premature wear of some bearings due to insufficient lubrication, and reducing the resistance of the oil flow in the process of reaching the needle roller bearing 4, thereby improving the flow efficiency of the lubricating oil.

[0035] On the basis of the above-mentioned embodiment, an assembly section 11 is provided on the outer axial surface in the middle of the rotating shaft 1. The assembly section 11 has tooth grooves 11a evenly distributed along the circumferential direction. Each tooth groove 11a is arranged along the length direction of the rotating shaft 1. The swash plate 2 is sleeved on the assembly section 11, and the inner side surface is arranged to fit the outer side surface of the tooth groove 11a. The arrangement of the assembly section 11 provides a stable support point for the swash plate 2, ensuring the stability of the swash plate 2 during the rotation process and reducing vibration. The uniform distribution of the tooth grooves 11a and the fitting design with the swash plate 2 help to improve the assembly accuracy and ensure the close fit between the swash plate 2 and the rotating shaft 1.

[0036] On the basis of the above embodiment, the shaft diameter of the rotating shaft 1 at one end facing the oil inlet chamber is reduced to form a mounting section 12, and the side where the outer shaft surface of the mounting section 12 intersects with the oil outlet hole 1a forms a mounting surface 12a, and the mounting surface 12a is a plane; the shaft diameter of the mounting section 12 is reduced, which makes the installation more convenient and facilitates assembly with the housing 5, reducing the difficulty and time of installation; at the same time, the mounting surface 12a is provided to facilitate determination of the relative position and angle between the rotating shaft 1 and the housing 5 during assembly, thereby improving the efficiency and accuracy of the overall assembly.

[0037] On the basis of the above embodiment, it also includes a shell 5, which is hollow and forms a working chamber 5a. The rotating shaft 1, the swash plate 2, the plane bearing 3 and the needle bearing 4 are all arranged in the working chamber 5a, and the shell 5 is coaxially arranged with the rotating shaft 1. The setting of the shell 5 provides stable support for the rotating shaft 1 and other components, reduces the influence of external factors on internal components, and improves the stability of the overall structure.

[0038] On the basis of the above embodiment, the shell 5 includes a front section 51, a first middle section 52, a second middle section 53 and a rear section 54 which are connected in sequence, the working chamber 5a is arranged in the first middle section 52 and the second middle section 53, the two ends of the rotating shaft 1 are respectively arranged in the front section 51 and the rear section 54, and the mounting section 12 is plugged into the rear section 54, and the end of the oil outlet channel 1b is arranged opposite to the oil inlet chamber in the rear section 54; by dividing the shell 5 into the front section 51, the middle section and the rear section 54, a modular design is realized, which is convenient for manufacturing, assembly and maintenance, and the end of the oil outlet channel 1b is arranged opposite to the oil inlet chamber in the rear section 54, which optimizes the flow path of the lubricating oil and ensures that the lubricating oil can be efficiently and evenly distributed to the parts that need lubrication.

[0039] On the basis of the above-mentioned embodiment, baffles 6 are provided between the front section 51 and the first middle section 52 and between the rear section 54 and the second middle section 53. The baffles 6 are sleeved on the outer axial surface of the rotating shaft 1 and are arranged in contact with the end surface of the needle bearing 4 facing away from the swash plate 2. The provision of the baffles 6 helps to enhance the connection stability between the sections of the housing 5, reduce the structural deformation caused by vibration or impact, improve the sealing effect of the housing 5, prevent the leakage of lubricating oil and the intrusion of external pollutants, and at the same time help to dissipate the heat generated inside and improve the heat dissipation efficiency.

[0040] On the basis of the above embodiment, the first middle section 52 and the second middle section 53 are hollowly arranged along the axial direction of the rotating shaft 1 to form a plurality of assembly chambers 52a. The plurality of assembly chambers 52a are symmetrically and evenly spaced around the center of the rotating shaft 1, and a piston 7 is correspondingly assembled in each assembly chamber 52a. Preferably, there are five assembly chambers 52a and five pistons 7. The symmetrically and evenly distributed assembly chambers 52a and pistons 7 help to balance the load on each piston 7, reduce the stress on a single piston 7, extend the service life of the piston 7 and related components, and improve the gas compression efficiency and the overall performance of the compressor; the compressor structure is more compact and the floor space is reduced.

[0041] On the basis of the above-mentioned embodiment, hemispheres 8 are provided at the edges of both sides of the swash plate 2, and the piston 7 is provided with a ball socket 7a and an inclined hole 7b. The ball socket 7a matches with the hemisphere 8, and the inclined hole 7b is provided through from the inner side surface of the piston 7 toward the middle of the ball socket 7a; the hemisphere 8 on the swash plate 2 matches with the ball socket 7a on the piston 7, which helps to improve the stability and accuracy of the connection and reduce the vibration and noise during operation; by adding the inclined holes 7b at the bottom of the ball sockets 7a at both ends of the piston 7 and connecting and penetrating to the inner side surface of the piston 7, when the compressor runs at a high speed, the lubricating oil between the ball socket 7a and the inclined hole 7b can be supplemented through the corresponding inclined holes 7b, thereby achieving the effect and efficiency of full lubrication, avoiding the phenomenon of sintering caused by insufficient lubrication of the ball socket 7a and the hemisphere 8, and extending the service life.

[0042] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A piston compressor lubrication oil return structure, characterized in that: include: A rotating shaft and a swash plate, a plane bearing and a needle roller bearing sleeved on the rotating shaft, wherein the swash plate is located in the middle of the rotating shaft, two plane bearings and two needle roller bearings are provided, the two plane bearings are respectively abutted against the two end surfaces of the swash plate, and the two needle roller bearing sleeves are respectively provided at the two ends of the rotating shaft; Among them, the rotating shaft is provided with an oil outlet hole and an oil outlet channel. The rotating shaft extends from the middle of the end face facing the oil inlet chamber toward the other end face to form the oil outlet channel, and the oil outlet channel is arranged in the axial direction of the rotating shaft. There are multiple oil outlet holes, which are located on the outer shaft surface of the rotating shaft, and the oil outlet holes are connected with the oil outlet channel. Each of the oil outlet holes is respectively arranged corresponding to the plane bearing or the needle roller bearing.

2. The lubrication oil return structure of a piston compressor according to claim 1, characterized in that: The bottom end of the oil outlet channel is arranged corresponding to the needle bearing far away from the oil inlet chamber.

3. The lubrication oil return structure of a piston compressor according to claim 1, characterized in that: An assembly section is arranged on the outer axial surface of the middle part of the rotating shaft, and the assembly section has teeth grooves evenly distributed along the circumference, each of the teeth grooves is arranged along the length direction of the rotating shaft, the swash plate is sleeved on the assembly section, and the inner side surface is arranged to fit the outer side surface of the teeth groove.

4. The lubrication oil return structure of a piston compressor according to claim 1, characterized in that: The end of the rotating shaft facing the oil inlet cavity is reduced in diameter to form a mounting section, and the outer shaft surface of the mounting section intersects with the oil outlet hole to form a mounting surface, which is a plane.

5. The lubrication oil return structure of a piston compressor according to claim 4, characterized in that: It also includes a shell, which is hollow and forms a working chamber. The rotating shaft, the swash plate, the plane bearing and the needle bearing are all arranged in the working chamber, and the shell is coaxially arranged with the rotating shaft.

6. The lubrication oil return structure of a piston compressor according to claim 5, characterized in that: The shell includes a front section, a first middle section, a second middle section and a rear section which are connected in sequence, the working chamber is arranged in the first middle section and the second middle section, the two ends of the rotating shaft are respectively arranged in the front section and the rear section, and the mounting section is plugged in the rear section, and the end of the oil outlet channel is arranged opposite to the oil inlet chamber in the rear section.

7. The lubrication oil return structure of a piston compressor according to claim 6, characterized in that: A baffle is provided between the front section and the first middle section and between the rear section and the second middle section. The baffle is sleeved on the outer axial surface of the rotating shaft and abuts against the end surface of the needle bearing away from the swash plate.

8. The lubrication oil return structure of a piston compressor according to claim 6, characterized in that: The first middle section and the second middle section are hollowly arranged along the axial direction of the rotating shaft to form a plurality of assembly cavities. The plurality of assembly cavities are symmetrically and evenly spaced around the center of the rotating shaft, and a piston is correspondingly assembled in each of the assembly cavities.

9. The lubrication oil return structure of a piston compressor according to claim 8, characterized in that: The number of the assembly chambers and the pistons is five.

10. The lubrication oil return structure of a piston compressor according to claim 9, characterized in that: The edges of both sides of the swash plate are provided with hemispheres, the piston is provided with a ball socket and an inclined hole, the ball socket matches the hemisphere, and the inclined hole is provided through the inner side surface of the piston toward the middle of the ball socket.

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