Compression assembly of rotary compressor and compressor

Abstract

The present invention provides a compression assembly and a compressor of a rotary compressor, which relates to the technical field of compressors. It includes a cylinder body with a rotary hole in the center, a rotor located inside the rotary hole of the cylinder body, a slide groove radially opened along the rotary hole to the edge of the cylinder body, a blade slidably connected in the slide groove, a connecting groove with a crescent bottom opened at the edge of the rotor, a crescent-shaped connecting piece extending from the end of the blade to fit the connecting groove, the connecting piece is embedded in the connecting groove and the two are connected in a sliding and sealing manner. The rotor and the blades are connected to each other by a sliding constraint connection between the connecting groove and the connecting piece. During the eccentric rotation of the eccentric wheel, the rotor does not rotate and is always constrained to be connected to the blades. The sliding constraint connection reduces the generation of overlapping friction, thereby avoiding the possibility of wear of the rotor and blades due to friction. In addition, the relative sealing of the connecting piece and the connecting groove reduces the possibility of gas leakage, thereby improving the overall efficiency of the compressor and extending its life.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a compression assembly of a rotor type compressor and a compressor. Background Art

[0002] There are many types of compressors, which are used in power air compressors, air conditioning refrigeration and heating, vacuum pumps and other fields. Compressors are mainly divided into piston type, rotor type, scroll type and so on according to different structures. Among them, rolling rotor compressors are widely used due to their simple structure, low cost and diversified applicability.

[0003] In the existing rolling rotor compressor, the rotor and blades are two independent components, which are connected by overlapping, that is, the end of the blade overlaps the outer wall of the rotor, and the eccentric rotation of the eccentric wheel drives the rotor to push the blade to reciprocate. During the rotation process of this pushing method, the outer wall of the rotor and the blade will produce friction, causing the end of the blade and the outer wall of the rotor to be easily worn.

[0004] In addition, since the above-mentioned matching method of the blade and the rotor cannot form a seal, it is necessary to apply a pre-tightening spring force at the bottom of the blade to achieve close contact with the rotor to achieve sealing, which creates a certain resistance to the operation of the rotor, that is, increases the friction, and further reduces the mechanical operation efficiency; when the pre-tightening spring force is reduced or the wear between the blade and the rotor increases, the clearance fluctuation between the blade and the rotor will become larger, and gas leakage will inevitably increase, reducing the operating efficiency of the compressor and shortening the life of the compressor. Summary of the invention

[0005] The purpose of the present invention is to provide a compression assembly of a rotary compressor and a matching compressor thereof, which changes the connection mode between the rotor and the blades, relatively reduces the friction between the blades and the rotor, reduces wear and gas leakage between the blades and the rotor, improves the operating efficiency of the compressor, and extends the service life of the compressor.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A compression assembly of a rotary compressor comprises a cylinder body with a rotary hole in the center, a rotor located inside the rotary hole of the cylinder body, a slide groove radially opened along the rotary hole toward the edge of the cylinder body, a blade slidably connected in the slide groove, a connecting groove with a crescent bottom opened at the edge of the rotor, a crescent-shaped connecting piece extending from the end of the blade and adapted to the connecting groove, the connecting piece is embedded in the connecting groove and the two are connected in a sliding and sealing manner, and the blade and the rotor are connected by sliding constraints through the connecting groove and the connecting piece.

[0008] Preferably, the compression assembly of the rotor compressor also includes an eccentric wheel and a rotating shaft eccentrically fixed on the eccentric wheel. The rotor is annular, the eccentric wheel is arranged inside the rotor and the two are slidably connected, the outer wall of the eccentric wheel is always in contact with the inner wall of the rotor, and the eccentric wheel rotates relative to the rotor; an air inlet hole connected to the rotating hole is radially penetrated through the cylinder body, and the air inlet hole is located on one side of the blade.

[0009] Preferably, the compression assembly of the rotary compressor further comprises a front cover and a rear cover respectively connected to the front and back sides of the cylinder body.

[0010] Preferably, a first inner exhaust hole is provided on the rotor, and the first inner exhaust hole is located on the other side of the blade. A first air collecting groove is provided on the outer wall of the eccentric wheel. The rotation of the eccentric wheel relative to the rotor can drive the first air collecting groove to communicate with the first inner exhaust hole. The eccentric wheel is also provided with a first air transmission hole located inside the first air collecting groove. The rotating shaft is axially provided with an axial exhaust hole which is always connected with the first air transmission hole.

[0011] Preferably, the axial thickness of the rotor is greater than the axial thickness of the eccentric wheel, the eccentric wheel and the rotor form a lubrication cavity, the rotating shaft is radially provided with a first inner lubrication hole, and axially provided with a first outer lubrication hole which is always connected to the first inner lubrication hole, and the first inner lubrication hole is located in the lubrication cavity.

[0012] Preferably, a second inner lubrication hole is further provided on the rotor, and two ends of the second inner lubrication hole are respectively located in the connecting groove and in the lubrication cavity.

[0013] Preferably, the shaft exhaust hole is opened axially inward from one end of the rotor, and the first external lubrication hole is opened axially inward from the other end of the rotor. The shaft exhaust hole and the first external lubrication hole are parallel to each other and are not connected.

[0014] Preferably, a second inner exhaust hole is provided on the rotor, and the second inner exhaust hole is located on the other side of the blade. A second air supply hole is provided on the blade along the length direction. The swing of the rotor relative to the blade can drive the second inner exhaust hole to connect with the second air supply hole. A second air collecting groove located in the slide groove is provided on the cylinder body. The cylinder body also has a cylinder exhaust hole located in the second air collecting groove. The reciprocating sliding of the blade along the slide groove can drive the second air supply hole to connect with the second air collecting groove.

[0015] Preferably, the shaft is radially provided with a second external lubrication hole, the eccentric wheel is radially provided with a third internal lubrication hole connecting the second external lubrication hole and the inner wall of the rotor, and the rotor is provided with a fourth internal lubrication hole connecting to the connecting groove along the inner wall toward the edge.

[0016] A compressor comprises a compression assembly of the above-mentioned rotor compressor.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: the rotor and the blades are connected to each other by means of a sliding constraint connection between the connecting groove and the connecting piece, and the eccentric wheel is arranged inside the rotor, replacing the direct contact overlap between the rotor and the blades. During the eccentric rotation of the eccentric wheel, the rotor does not rotate and is always constrained to be connected with the blades. The sliding constraint connection method reduces the generation of overlapping friction, thereby avoiding the possibility of wear of the rotor and blades due to friction. In addition, the relative sealing of the connecting piece and the connecting groove reduces the possibility of gas leakage, thereby improving the overall efficiency of the compressor and extending its life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the compression component of the rotary compressor.

[0019] Figure 2 for Figure 1 Schematic diagram of the structure from another angle.

[0020] Figure 3 It is a schematic diagram of the structure of the compression assembly of the rotary compressor excluding the front cover and the rear cover.

[0021] Figure 4 It is a front perspective view of the compression assembly of the rotary compressor in Example 1 except for the front cover and the rear cover.

[0022] Figure 5 This is a perspective view showing the structure of the eccentric wheel and the rotating shaft in Example 1.

[0023] Figure 6 Schematic diagram of the structure of the rotor in Example 1.

[0024] Figure 7 It is a front perspective view of the compression assembly of the rotary compressor in Example 2 except for the front cover and the rear cover.

[0025] Figure 8 This is a schematic diagram of the structure of the rotor, eccentric wheel and rotating shaft in Example 2.

[0026] Fig. 9 This is a perspective view showing the structure of the eccentric wheel and the rotating shaft in Example 2.

[0027] Fig.10 This is a schematic diagram of the structure of the cylinder body in Example 2.

[0028] Fig.11 for Fig.10 A cross-sectional view in one direction.

[0029] Markings in the figure: cylinder body-1, slide groove-11, air inlet hole-12, second air collecting groove-13, cylinder exhaust hole-14, rotor-2, connecting groove-21, first inner exhaust hole-22, second inner lubrication hole-23, second inner exhaust hole-24, fourth inner lubrication hole-25, eccentric wheel-3, first air collecting groove-31, first air delivery hole-32, third inner lubrication hole-33, fifth inner lubrication hole-34, rotating shaft-4, shaft exhaust hole-41, first inner lubrication hole-42, first outer lubrication hole-43, second outer lubrication hole-44, blade-5, connecting piece-51, second air delivery hole-52, front end cover-6, rear end cover-7. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] Please see Figure 3 The compression assembly of the rotary compressor includes a cylinder 1 with a circular rotary hole in the center, an annular rotor 2 located inside the rotary hole of the cylinder 1, an eccentric wheel 3 located inside the rotor 2 and slidably connected to the rotor 2, and a rotating shaft 4 eccentrically fixed on the wheel surface of the eccentric wheel 3. The diameter of the rotor 2 is smaller than the inner diameter of the rotary hole. The eccentric wheel 3 is driven by the rotation of the rotating shaft 4 to rotate eccentrically and rotates relative to the rotor 2, driving the rotor 2 to move along the inner wall of the rotary hole of the cylinder 1. The cylinder 1 is provided with a slide groove 11 radially from the rotary hole to the edge. The slide groove 11 is slidably connected with a blade 5, and the blade 5 reciprocates along the slide groove 11. The cylinder 1 is penetrated radially with an air inlet 12 connected to the rotary hole. The air inlet 12 is located on one side of the blade 5 and close to the blade 5. The side surface of the blade 5, the inner wall surface of the rotary hole of the cylinder 1, and the outer wall surface of the rotor 2 form an air inlet space.

[0033] The edge of the rotor 2 is provided with a crescent-bottomed connecting groove 21, and the end of the blade 5 is extended with a crescent-shaped connecting piece 51 adapted to the connecting groove 21. The connecting piece 51 is embedded in the connecting groove 21 and the two are connected in a sliding and sealing manner. During the rotation of the eccentric wheel 3, the rotor 2 is driven to swing back and forth relative to the blade 5. The blade 5 and the rotor 2 are connected by sliding constraints through the connecting groove 21 and the connecting piece 51, and the blade 5 slides back and forth along the slide groove 11. The blade 5 is sealed with the rotor 2 to ensure the sealing of the air intake space and prevent gas leakage. There is no need to add springs and other components to provide preload spring force.

[0034] Please see Figure 1 , Figure 2Furthermore, the compression assembly of the rotary compressor further includes a front cover 6 and a rear cover 7 respectively connected to the front and back sides of the cylinder body 1, both of which are sealed and connected to the cylinder body 1 through fasteners. The front cover 6 and the rear cover 7 are both provided with shaft holes, and the rotating shaft 4 passes through the shaft holes and is rotatably connected to the front cover 6 and the rear cover 7 through bearings.

[0035] In another preferred embodiment, a spring is provided at the bottom of the blade 5 to apply a preload force to the connection with the rotor 2, and the spring preload force is lower than the spring preload force applied in the existing rotor compressor, so as to ensure that the blade 5 connecting member 51 is always in close contact with the connecting groove 21 of the rotor 2, and to appropriately reduce the escape pressure of the blade 5 connecting member 51 on the opening part of the connecting groove 21 of the rotor 2 when the rotor 2 moves in a direction away from the blade 5, thereby reducing the wear of the opening part; in this embodiment, the blade 5 has rotational resistance to the rotor 2 during the compression stage, but the optimal spring preload force can be selected according to the actual application to reduce its influence on the rotor 2.

[0036] The compressor comprises the compression assembly of the above-mentioned rotary compressor. In a multi-cylinder compressor, one or more intermediate partitions are arranged between the compression assemblies of every two rotary compressors.

[0037] Embodiment 1:

[0038] Please see Figures 4 to 6 Furthermore, the rotor 2 is provided with a first inner exhaust hole 22, which is located on the other side of the blade 5 and close to the blade 5. The side surface of the blade 5, the inner wall surface of the rotating hole of the cylinder body 1, and the outer wall surface of the rotor 2 form an exhaust space, that is, the first inner exhaust hole 22 is located in the exhaust space. The eccentric wheel 3 is provided with a first air collecting groove 31 along the circumference of the arc-shaped outer wall. During the rotation of the eccentric wheel 3 relative to the rotor 2, the first air collecting groove 31 is connected with the first inner exhaust hole 22 to block the reciprocating switching. The eccentric wheel 3 is also provided with a first air delivery hole 32 located inside the first air collecting groove 31, and the rotating shaft 4 is provided with an axial exhaust hole 41 along the axial direction that is always connected with the first air delivery hole 32.

[0039] Furthermore, the axial thickness of the rotor 2 is greater than the axial thickness of the eccentric wheel 3, and the front and back surfaces of the eccentric wheel 3 and the front and back surfaces of the rotor 2 respectively form two positive and negative lubrication cavities, and the rotating shaft 4 is provided with a first inner lubrication hole 42 in the radial direction and a first outer lubrication hole 43 which is always connected to the first inner lubrication hole 42 in the axial direction. There are two first inner lubrication holes 42, which are respectively located in the positive and negative lubrication cavities. Lubricating oil is injected along the first outer lubrication hole 43 and enters the two lubrication cavities along the two first inner lubrication holes 42 respectively, lubricating the eccentric wheel 3 and the rotor 2, reducing the friction between the two, and improving the smoothness of the rotation of the eccentric wheel 3 relative to the rotor 2.

[0040] Furthermore, a second internal lubrication hole 23 is provided on the rotor 2, and its two ends are respectively located in the connecting groove 21 and the lubrication cavity. The lubricating oil inside the rotor 2 enters the connecting groove 21 along the second internal lubrication hole 23 to lubricate the connecting piece 51 and the rotor 2, thereby reducing the friction between the two and improving the smoothness of the sliding of the connecting piece 51 relative to the rotor 2.

[0041] Furthermore, the shaft exhaust hole 41 is opened axially inward from one end of the rotor 2 to the connection with the first air supply hole 32, and the first external lubrication hole 43 is opened axially inward from the other end of the rotor 2 to the connection with the first internal lubrication hole 42, and the shaft exhaust hole 41 and the first external lubrication hole 43 are parallel to each other and not connected.

[0042] The working principle of the present embodiment 1 is as follows: external gas enters the intake space through the intake hole 12, the rotating shaft 4 rotates, driving the eccentric wheel 3 to rotate eccentrically, and then driving the rotor 2 to move along the inner wall of the rotating hole of the cylinder body 1, and the outer wall of the cylinder body 1 compresses the gas in the intake space into the exhaust space, and the compressed gas in the exhaust space enters the first inner exhaust hole 22. When the eccentric wheel 3 rotates to the first gas collecting groove 31 and is connected with the first inner exhaust hole 22, the compressed gas in the exhaust hole enters the first gas collecting groove 31, and then enters the first gas delivery hole 32 from the first gas collecting groove 31, and enters the shaft exhaust hole 41 through the first gas delivery hole 32 for discharge, thereby completing the gas compression.

[0043] Embodiment 2:

[0044] Please see Figures 7 to 11 Furthermore, a second inner exhaust hole 24 is provided on the rotor 2, and the second inner exhaust hole 24 is located on the other side of the blade 5 and close to the blade 5. The side surface of the blade 5, the inner wall surface of the cylinder body 1 rotating hole, and the outer wall surface of the rotor 2 form an exhaust space, that is, the second inner exhaust hole 24 is located in the exhaust space, and the blade 5 is provided with a second inner exhaust hole 24 along the length direction. During the rotation of the rotor 2 relative to the blade 5, the second inner exhaust hole 24 is driven to communicate with the second air delivery hole 52 and block the reciprocating switching. A second air collecting groove 13 located in the slide groove 11 is provided on the cylinder body 1, and a cylinder exhaust hole 14 located in the second air collecting groove 13 is also provided on the cylinder body 1; the longitudinal length of the second air collecting groove 13 is less than the length of the unidirectional motion trajectory of the blade 5, and the blade 5 reciprocates along the slide groove 11 to drive the second air delivery hole 52 to communicate with the second air collecting groove 13.

[0045] Furthermore, the rotating shaft 4 is provided with a second outer lubrication hole 44 in the radial direction, the eccentric wheel 3 is provided with a third inner lubrication hole 33 in the radial direction, which is connected to the second outer lubrication hole 44 and the inner wall of the rotor 2, and the rotor 2 is provided with a fourth inner lubrication hole 25 in the inner wall to the edge, which is connected to the connecting groove 21. The lubricating oil enters from the second outer lubrication hole 44, enters the inner wall of the rotor 2 along the third inner lubrication hole 33, and enters the connecting groove 21 along the fourth inner lubrication hole 25, respectively lubricating between the rotor 2 and the eccentric wheel 3, and between the connecting member 51 and the rotor 2, thereby reducing friction, and respectively improving the smoothness of the rotation of the eccentric wheel 3 relative to the rotor 2, and improving the smoothness of the sliding of the connecting member 51 relative to the rotor 2.

[0046] Furthermore, the eccentric wheel 3 is radially penetrated with a fifth internal lubrication hole 34 connected to the third internal lubrication hole 33. During the rotation of the eccentric wheel 3, the fifth internal lubrication hole 34 is connected to the fourth internal lubrication hole 25 to block the reciprocating switching. The lubricating oil also enters the two gaps between the front end cover 6, the rear end cover 7 and the rotor 2 along the fifth internal lubrication hole 34, respectively, to lubricate the rotor 2, the eccentric wheel 3 and the front end cover 6, the rear end cover 7, thereby reducing friction and improving the smoothness of the rotation of the rotor 2 and the eccentric wheel 3 relative to the front end cover 6, the rear end cover 7.

[0047] The working principle of the second embodiment is as follows: external gas enters the intake space through the intake hole 12, the rotating shaft 4 rotates, driving the eccentric wheel 3 to rotate eccentrically, and then driving the rotor 2 to move along the inner wall of the rotating hole of the cylinder body 1, and the outer wall of the cylinder body 1 compresses the gas in the intake space into the exhaust space, and the compressed gas in the exhaust space enters the second inner exhaust hole 24 and the second gas delivery hole 52 in turn, and the compressed gas in the second gas delivery hole 52 enters the second gas collecting groove 13 and is discharged along the cylinder exhaust hole 14 to complete the gas compression.

[0048] Both exhaust methods described in Example 1 and Example 2 do not require the installation of a reed valve or other types of exhaust valves, which prevents the reed valve or other types of exhaust valves from failing and being damaged due to the high exhaust frequency. In addition, the reed valve will also generate noise during use. This exhaust method can also avoid the noise generated by the reed valve.

[0049] The compression assembly and the compressor are not limited to the exhaust structure and the exhaust method described in Examples 1 and 2, and may also use the same exhaust structure as the existing rotary compressor, such as using a reed valve or other types of exhaust valves for exhaust.

[0050] The principles and implementation methods of the present invention are described in this article using specific embodiments. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A compression assembly of a rotary compressor, comprising a cylinder with a rotary hole in the center, a rotor located inside the rotary hole of the cylinder, a front cover and a rear cover connected to the front and back sides of the cylinder respectively, a slide groove is radially opened along the rotary hole to the edge of the cylinder, and a blade is slidably connected in the slide groove, characterized in that: A crescent-shaped connecting groove is provided at the edge of the rotor, and a crescent-shaped connecting piece adapted to the connecting groove is extended from the end of the blade. The connecting piece is embedded in the connecting groove and the two are connected in a sliding and sealing manner. The blade and the rotor are connected in a sliding and restraining manner through the connecting groove and the connecting piece. It also includes an eccentric wheel and a rotating shaft eccentrically fixed on the eccentric wheel. The rotor is annular. The eccentric wheel is arranged inside the rotor and the two are slidably connected. The outer wall of the eccentric wheel is always in contact with the inner wall of the rotor. The eccentric wheel rotates relative to the rotor. The cylinder body is radially penetrated with an air inlet hole connected to the rotating hole, and the air inlet hole is located on one side of the blade. The rotor is provided with a first inner exhaust hole, the first inner exhaust hole is located on the other side of the blade, the outer wall of the eccentric wheel is provided with a first air collecting groove, the rotation of the eccentric wheel relative to the rotor can drive the first air collecting groove to communicate with the first inner exhaust hole, the eccentric wheel is also provided with a first air transmission hole located inside the first air collecting groove, and the rotating shaft is provided with an axial exhaust hole along the axial direction which is always connected with the first air transmission hole; The axial thickness of the rotor is greater than the axial thickness of the eccentric wheel, the eccentric wheel and the rotor form a lubrication cavity, the rotating shaft is provided with a first inner lubrication hole in the radial direction, and a first outer lubrication hole which is always connected with the first inner lubrication hole in the axial direction, the first inner lubrication hole is located in the lubrication cavity, and the rotor is also provided with a second inner lubrication hole, the two ends of which are respectively located in the connecting groove and in the lubrication cavity; The shaft exhaust hole is opened axially inward from one end of the rotor, and the first external lubrication hole is opened axially inward from the other end of the rotor. The shaft exhaust hole and the first external lubrication hole are parallel to each other and are not connected. The rotor is provided with a second inner exhaust hole, the second inner exhaust hole is located on the other side of the blade, the blade is provided with a second air delivery hole along the length direction, the rotor swings relative to the blade to drive the second inner exhaust hole to communicate with the second air delivery hole, the cylinder body is provided with a second air collecting groove located in the slide groove, and the cylinder body is also provided with a cylinder exhaust hole located in the second air collecting groove; the blade reciprocates along the slide groove to drive the second air delivery hole to communicate with the second air collecting groove; The shaft is radially provided with a second external lubrication hole, the eccentric wheel is radially provided with a third internal lubrication hole connecting the second external lubrication hole and the inner wall of the rotor, and the rotor is provided with a fourth internal lubrication hole connecting to the connecting groove along the inner wall to the edge.

2. A compressor, characterized in that: A compression assembly comprising the rotary compressor according to claim 1.

Images