Upper flange for rotary compressor, rotary compressor and air conditioner

Abstract

The invention provides an upper flange for a rotary compressor, the rotary compressor and an air conditioner, the upper flange comprises a flange body, the flange body comprises a flange plate and an outer cylinder located on the upper end face of the flange plate, and the outer cylinder is provided with a first center through hole penetrating through the two ends of the outer cylinder in the axial direction of the flange plate; a first center through hole is formed in the outer cylinder, an inner cylinder is coaxially assembled in the first center through hole, the inner cylinder is provided with a second center through hole axially penetrating through the two ends of the inner cylinder, the second center through hole is used for being matched with a crankshaft to form a rotating friction pair, and a first oil return runner is formed between the inner circle wall face of the outer cylinder and the outer circle wall face of the inner cylinder. A spiral opening groove is formed in the hole wall face of the second center through hole, and a communicating hole is further formed in the inner barrel and communicates between the spiral opening groove and the first oil return flow channel. The first oil return flow channel is constructed on the first central through hole and the exposed surface of the inner cylinder body, so that the machining process of the groove is simplified, the machining difficulty is reduced, and the machining efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning, and in particular relates to an upper flange for a rotary compressor, a rotary compressor and an air conditioner. Background Art

[0002] Figure 1 The figure shows a schematic diagram of the overall assembly structure of a conventional rotor compressor. A conventional rolling rotary compressor is mainly composed of a pump body assembly, a motor assembly, a liquid distributor component, a housing assembly, an upper cover, a lower cover, etc. The housing assembly cooperates with the upper cover and the lower cover to form a closed housing. The pump body assembly and the motor assembly are assembled inside the housing. The pump body assembly includes an upper flange, a cylinder, a crankshaft, rollers, a lower flange and other major components. Each component cooperates with each other to form a closed cavity. The motor assembly includes a stator assembly and a rotor assembly. The rotary compressor generates a driving force on the pump crankshaft through the electromagnetic force generated between the motor rotor assembly and the stator assembly. Under the driving action of the crankshaft rotation, the volume of the pump body cavity changes continuously to achieve periodic suction, compression and exhaust. The oil-gas mixture discharged from the pump body cavity enters the lower cavity space of the motor, and then passes through the motor circulation channel hole to the upper cavity of the motor, and then is discharged from the compressor into the air conditioning system (the circulation path is as shown in FIG. Figure 1 ).

[0003] The oil circuit in the pump body pumps the lubricating oil to the contact surface of the moving parts, thereby achieving the effect of lubrication, cooling and heat dissipation. The oil circuit structure of the main and auxiliary bearings (i.e., the upper and lower flanges) of a conventional rolling rotary compressor is as follows: the crankshaft is provided with a central oil hole, and the roots of the major and minor axes of the crankshaft are respectively designed with side oil holes that penetrate the central oil hole of the crankshaft. The entrance of the central oil hole of the crankshaft is equipped with an oil pump device (e.g. Figure 1 The oil guide plate shown in the figure), the inner circumference of the upper flange and the lower flange are respectively provided with spiral oil grooves, and a certain amount of lubricating oil is installed in the lower part of the shell. When the compressor is running, under the action of the crankshaft center oil hole oil pumping device, the lubricating oil in the bottom oil pool is pumped into the center oil hole, and is pumped to the ends of the inner circumference of the lower flange and the upper flange through the side oil holes at the roots of the major and minor shafts of the crankshaft, respectively, and then is pumped to the friction pairs (main and minor bearings) surfaces of the upper and lower flanges and the major and minor shafts of the crankshaft through the spiral oil grooves on the upper and lower flanges, respectively, so as to realize the oil path lubrication of the main and minor bearings (the main bearing lubricating oil path flow path, such as Figure 1 (indicated by the solid arrow in the middle).

[0004] When the compressor operates at high frequency, a large amount of lubricating oil is pumped out from the spiral oil groove of the upper flange to the lower cavity of the motor, and then flows through the circulation channel hole of the motor to the upper cavity of the motor with high-speed airflow, and then discharged into the system, resulting in a high oil discharge rate when the compressor runs at high frequency. While the performance of the compressor is reduced, the reliability risk of oil shortage inside the compressor is increased.

[0005] Based on the technical bottleneck problem of the conventional compressor oil circuit structure under high-frequency working conditions, in the related technologies, such as Figures 2 to 5 As shown, by opening an oil return channel connected to the oil pool at the bottom of the compressor on the inner surface of the upper flange or in the flange entity, the lubricating oil circuit can circulate inside the pump body, avoiding the centrifugal force and gas force of the crankshaft rotation from carrying the lubricating oil into the upper and lower chambers of the motor, greatly reducing the oil content of the upper and lower chambers of the motor, thereby reducing the oil discharge rate of the compressor.

[0006] However, when the oil return channel is set on the inner surface of the upper flange, the effective load-bearing contact area between the upper flange and the crankshaft will be greatly reduced, the load-bearing capacity of the main bearing (that is, the upper flange) will be weakened, and the processing technology and burr cleaning technology will be complicated; when the oil return channel is set in the upper flange entity, the processing technology is complicated and the processing difficulty is relatively large.

[0007] In addition, for high-frequency rolling rotary compressors, the bearing stress and structural strength are greatly deteriorated. In order to optimize the bearing contact stress, force distribution and structural strength, it is usually necessary to increase the flexible groove depth H while reducing the flexible groove width W (such as Figure 5 However, if the flexible groove is too deep and too narrow (i.e. H is too large and W is too small), many processing problems such as difficulty in inserting the knife, knife breakage, and difficulty in cleaning burrs may occur. Summary of the invention

[0008] Therefore, the present invention provides an upper flange for a rotary compressor, a rotary compressor, and an air conditioner, which can overcome the technical problems in the related art of setting an oil return channel in the upper flange entity, and the complex processing technology and high processing difficulty.

[0009] In order to solve the above problems, the present invention provides an upper flange for a rotary compressor, including a flange body, the flange body including a flange plate and an outer cylinder body on the upper end surface of the flange plate, the outer cylinder body having a first center through hole extending axially through both ends of the outer cylinder body along the flange plate, an inner cylinder body being coaxially assembled in the first center through hole, the inner cylinder body having a second center through hole extending axially through both ends of the inner cylinder body, the second center through hole being used to cooperate with a crankshaft to form a rotating friction pair, a first oil return channel being formed between the inner circular wall surface of the outer cylinder body and the outer circular wall surface of the inner cylinder body, a spiral opening groove being formed on the hole wall surface of the second center through hole, and a connecting hole being also constructed in the inner cylinder body, the connecting hole being connected between the spiral opening groove and the first oil return channel.

[0010] In some embodiments, the first oil return flow channel includes an open groove configured on one of the outer cylinder and the inner cylinder, and a wall configured on the other of the outer cylinder and the inner cylinder and sealedly connected to a notch of the open groove.

[0011] In some embodiments, the inner cylinder is made of cast iron, and the material density of the outer cylinder is lower than the density of the cast iron.

[0012] In some embodiments, the outer cylinder is made of powder metallurgy.

[0013] In some embodiments, the outer cylinder is interference fit with the inner cylinder; and / or the flange body is integrally cast, and / or the inner cylinder is milled.

[0014] In some embodiments, the ends of the outer cylinder and the inner cylinder close to the inner cavity of the compressor are inner ends, a flexible groove is formed on the end surface of the inner end, and the flexible groove is formed by both the inner cylinder and the outer cylinder.

[0015] In some embodiments, an inner annular groove is formed on the outer cylinder wall surface of the inner cylinder body, and an outer annular groove is formed on the hole wall surface of the first center through hole, the longitudinal sections of the inner annular groove and the outer annular groove are both L-shaped, and the outer annular groove and the inner annular groove together form the flexible groove.

[0016] In some embodiments, a second oil return channel is further constructed in the flange body, and the inlet of the second oil return channel is connected to the outlet of the first oil return channel to guide the lubricating oil returning in the first oil return channel to flow back into the compressor oil pool.

[0017] The present invention also provides a rotary compressor, comprising a pump body assembly, wherein the pump body assembly comprises the above-mentioned upper flange for the rotary compressor.

[0018] The present invention also provides an air conditioner, comprising the above-mentioned rotary compressor.

[0019] The rotary compressor upper flange, rotary compressor and air conditioner provided by the present invention have the following beneficial effects:

[0020] An inner and outer coaxial assembly is formed between the inner cylinder and the outer cylinder, so that a first oil return flow channel is formed between the mating surfaces of the two, and the first oil return flow channel and the spiral opening groove are connected through a connecting hole. In this way, on the one hand, the first oil return flow channel does not need to be opened on the hole wall surface of the second central through hole, which effectively prevents the opening of the oil return flow channel on the hole wall surface of the second central through hole, resulting in a reduction in the effective bearing contact area between the upper flange and the crankshaft, weakening the bearing capacity of the upper flange, simplifying the processing technology and burr cleaning process. On the other hand, the aforementioned first oil return flow channel is constructed on the exposed surface of the first central through hole (hole wall surface) and / or the inner cylinder (outer circular wall surface), and the processing technology of the groove is simplified, reducing the processing difficulty and improving the processing efficiency.

[0021] The first oil return channel is formed by the open groove and the wall surface being assembled and sealed relative to each other, so that only a corresponding groove needs to be machined or molded on a corresponding wall surface of the outer cylinder or the inner cylinder, thereby simplifying the processing process;

[0022] The material density of the outer cylinder is less than the density of the cast iron. For example, the material of the outer cylinder is a lightweight material such as powder metallurgy, which can further reduce the overall mass of the upper flange, save material costs, and further improve the lightweight degree of the pump assembly and the compressor, so that the center of gravity of the pump assembly and the compressor is further moved downward, and the vibration stability of the whole machine is further improved;

[0023] The flexible groove is formed by a combination of corresponding structures on two circular wall surfaces of the inner cylinder and the outer cylinder that are opposite to each other. During specific processing, the exposed wall surfaces of the inner cylinder and / or the outer cylinder can be processed separately and then the two can be assembled to form the aforementioned flexible groove. In this way, the processing of the flexible groove is not restricted by its size, and many processing bottleneck problems such as difficulty in cutting, tool breakage, and difficulty in cleaning burrs that exist in the processing of the flexible groove structure with small width and large depth of conventional rotor compressors can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the assembly structure of a conventional rotor compressor in the related art;

[0026] Figure 2 This is a schematic diagram of the internal structure of a pump assembly in the related art, in which the arrows indicate the flow direction of the lubricating oil;

[0027] Figure 3 It is a schematic diagram of the internal structure of another pump assembly in the related art, in which the arrows indicate the flow direction of the lubricating oil;

[0028] Figure 4 This is another schematic diagram of the internal structure of a pump assembly in the related art, in which the arrows indicate the flow direction of the lubricating oil;

[0029] Figure 5 yes Figure 4 The local enlarged view of point I in the middle, the arrow in the figure indicates the flow direction of the lubricating oil;

[0030] Figure 6is a cross-sectional view of an upper flange for a rotary compressor according to an embodiment of the present invention, wherein arrows in the figure indicate the flow direction of lubricating oil;

[0031] Figure 7 yes Figure 6 A cross-sectional view of the flange body in FIG. 1 , in which the arrows indicate the flow direction of the lubricating oil;

[0032] Figure 8 yes Figure 6 A cross-sectional view of the inner cylinder in FIG. 1 , in which the arrows indicate the flow direction of the lubricating oil;

[0033] Fig. 9 It is applied Figure 6 Schematic diagram of the internal structure of the pump body assembly of the upper flange in the figure, the arrow in the figure indicates the flow direction of the lubricating oil;

[0034] Fig.10 is a cross-sectional view of an upper flange for a rotary compressor according to another embodiment of the present invention, wherein arrows in the figure indicate the flow direction of lubricating oil;

[0035] Fig.11 It is applied Fig.10 Schematic diagram of the internal structure of the pump body assembly of the upper flange, in which the arrows indicate the flow direction of the lubricating oil;

[0036] Fig.12 is a cross-sectional view of an upper flange for a rotary compressor according to another embodiment of the present invention, wherein arrows in the figure indicate the flow direction of lubricating oil;

[0037] Fig.13 It is applied Fig.12 Schematic diagram of the internal structure of the pump body assembly of the upper flange, in which the arrows indicate the flow direction of the lubricating oil;

[0038] Fig.14 is a cross-sectional view of an upper flange for a rotary compressor according to another embodiment of the present invention, wherein arrows in the figure indicate the flow direction of lubricating oil, and arrows in the figure indicate the flow direction of lubricating oil;

[0039] Fig.15 yes Fig.14 A cross-sectional view of the flange body in FIG. 1 , in which the arrows indicate the flow direction of the lubricating oil;

[0040] Fig.16 yes Fig.14 A cross-sectional view of the inner cylinder in FIG. 1 , in which the arrows indicate the direction of flow of the lubricating oil.

[0041] The accompanying drawings are marked as follows:

[0042] 1. Flange body; 11. Flange plate; 111. Oil drop groove; 12. Outer cylinder; 121. First center through hole; 122. Outer annular groove; 2. Inner cylinder; 21. Second center through hole; 22. Spiral opening groove; 23. Connecting hole; 24. Inner annular groove; 31. First oil return channel; 32. Second oil return channel; 4. Flexible groove; 100. Crankshaft; 1001. Center oil hole; 1002. Side oil hole; 1003. Eccentric part; 101. Cylinder; 102. Roller; 103. Lower flange. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0045] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0046] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0047] See also Figure 6 and Fig.16 As shown, according to an embodiment of the present invention, there is provided an upper flange for a rotary compressor, comprising a flange body 1, wherein the flange body 1 comprises a flange plate 11 and an outer cylinder 12 located on the upper end surface of the flange plate 11. It can be understood that when the lower end surface of the flange plate 11 is assembled in the pump body assembly, the lower end surface is sealed and connected to the upper end surface of the cylinder 101. The outer cylinder 12 has a first central through hole 121 that passes through both ends of the outer cylinder 12 along the axial direction of the flange plate 11. An inner cylinder 2 is coaxially assembled in the first central through hole 121. The inner cylinder 2 has a second central through hole 21 that passes through both ends of the inner cylinder 2 axially. The second center through hole 21 is used to cooperate with the crankshaft 100 to form a rotating friction pair (the rotating friction pair is also the main bearing), and a first oil return channel 31 is formed between the inner circular wall surface of the outer cylinder 12 and the outer circular wall surface of the inner cylinder 2. A spiral opening groove 22 is formed on the hole wall surface of the second center through hole 21. When the lubricating oil enters the spiral opening groove 22, it will lubricate and cool the second center through hole 21 and the crankshaft 100. A connecting hole 23 is also constructed in the inner cylinder 2, and the connecting hole 23 is connected between the spiral opening groove 22 and the first oil return channel 31, that is, the connecting hole 23 passes through the inner circular wall surface and the outer circular wall surface of the inner cylinder 2.

[0048] In this technical solution, an inner and outer coaxial assembly is formed between the inner cylinder 2 and the outer cylinder 12, so that a first oil return channel 31 is formed between the mating surfaces of the two, and the first oil return channel 31 is connected to the spiral opening groove 22 through a connecting hole 23. In this way, on the one hand, the first oil return channel 31 does not need to be opened on the hole wall surface of the second center through hole 21, and the opening of the oil return channel on the hole wall surface of the second center through hole 21 is effectively prevented, which leads to a reduction in the effective bearing contact area between the upper flange and the crankshaft, weakens the bearing capacity of the upper flange, simplifies the processing technology and burr cleaning process. On the other hand, the aforementioned first oil return channel 31 is constructed on the exposed surface of the first center through hole 121 (hole wall surface) and / or the inner cylinder 2 (outer circular wall surface), and the groove processing technology is simplified, which reduces the processing difficulty and improves the processing efficiency.

[0049] The aforementioned first oil return channel 31 can be formed by assembling and cooperating two relatively designed grooves respectively formed on the hole wall surface of the aforementioned first central through hole 121 and the outer circular wall surface of the inner cylinder 2, but this method requires simultaneous machining or groove mold design of the aforementioned inner cylinder 2 and outer cylinder 12, and the processing technology is relatively complicated. Therefore, in a preferred embodiment, the first oil return channel 31 includes an open groove (not marked in the figure) constructed on one of the outer cylinder 12 and the inner cylinder 2 and a wall surface constructed on the other of the outer cylinder 12 and the inner cylinder 2 and sealedly connected to the groove of the open groove.

[0050] In this technical solution, the first oil return channel 31 is formed by an open groove and a wall surface that are assembled and sealed relative to each other. In this way, it is only necessary to machine or mold a corresponding groove on a corresponding wall surface of the outer cylinder 12 or the inner cylinder 2, thereby simplifying the processing process. In another preferred embodiment, the aforementioned open groove is arranged on the outer cylinder 12, so that the wall thickness (radial thickness) of the inner cylinder 2 can be designed to be smaller under the premise of having the same structural strength. At this time, when the material of the inner cylinder 2 is cast iron, the mass of the inner cylinder 2 can be smaller, thereby making the overall mass of the upper flange smaller, which is conducive to the lightweight design of the upper flange, and the lightweight design can be conducive to reducing the height of the center of mass of the pump body assembly and the compressor using it, which can optimize the vibration stability of the compressor as a whole.

[0051] As mentioned above, the material of the inner cylinder 2 can be cast iron to ensure the wear resistance between the inner cylinder 2 and the crankshaft 100, that is, to reduce the degree of wear on the inner cylinder 2 during the rotation of the crankshaft 100. Due to the assembly relationship between the outer cylinder 12 and the inner cylinder 2 in the upper flange of the present application, the material of the outer cylinder 12 can be rotated alone without being limited by the rotational wear factor of the crankshaft 100. In a preferred embodiment, the material density of the outer cylinder 12 is less than the density of the cast iron. For example, the material of the outer cylinder 12 is a lightweight material such as powder metallurgy. This can further reduce the overall mass of the upper flange, save material costs, and further improve the lightweight degree of the pump body assembly and the compressor, so that the center of gravity of the pump body assembly and the compressor is further lowered, and the vibration stability of the whole machine is further improved.

[0052] It can be understood that the flange body 1 is constructed with a large number of shapes such as exhaust ports, air intake ports, and connecting holes. In order to simplify the processing of the flange body 1, in a specific embodiment, the flange body 1 is cast in one piece; the inner cylinder body 2 specifically needs to be assembled with the crankshaft 100, and has high requirements on the processing accuracy of corresponding structures such as the second center through hole 21. Based on this, the inner cylinder body 2 is formed by milling.

[0053] In a specific embodiment, the outer cylinder 12 and the inner cylinder 2 are interference fit. With this assembly method, the structure and assembly are relatively simple, easy to implement, and highly applicable.

[0054] See also Figures 14 to 16 As shown, in some embodiments, the end of the outer cylinder 12 and the inner cylinder 2 close to the inner cavity of the compressor pump body is the inner end (that is, Fig.14 A flexible groove 4 is formed on the inner end surface, and the flexible groove 4 is formed by both the inner cylinder 2 and the outer cylinder 12.

[0055] In this technical solution, the flexible groove 4 is formed by a combination of corresponding structures on two circular wall surfaces opposite to each other of the inner cylinder 2 and the outer cylinder 12. During specific processing, the exposed wall surfaces of the inner cylinder 2 and / or the outer cylinder 12 can be processed separately and then the two can be assembled to form the aforementioned flexible groove. In this way, the processing of the flexible groove is not restricted by its size, and many processing bottleneck problems such as difficulty in cutting, tool breakage, and difficulty in cleaning burrs in the processing of the flexible groove structure with small width and large depth in conventional rotor compressors can be solved.

[0056] In some embodiments, an inner annular groove 24 is formed on the outer cylinder wall surface of the inner cylinder body 2, and an outer annular groove 122 is formed on the hole wall surface of the first center through hole 121, and the longitudinal sections of the inner annular groove 24 and the outer annular groove 122 are both L-shaped, and the outer annular groove 122 and the inner annular groove 24 together form the flexible groove 4.

[0057] In this technical solution, the flexible groove 4 is formed by combining the inner annular groove 24 on the inner cylinder 2 and the outer annular groove 122 on the outer cylinder 12, so that the overall wall thickness (radial thickness) of the inner cylinder 2 can be designed to be relatively small, which is conducive to the lightweight design of the upper flange.

[0058] In some embodiments, a second oil return channel 32 is also constructed in the flange body 1, and the inlet of the second oil return channel 32 (not marked in the figure) is connected to the outlet of the first oil return channel 31 (not marked in the figure) to guide the lubricating oil refluxed in the first oil return channel 31 to flow back into the oil pool of the compressor. The lower end surface of the flange 11 has a mating surface that matches with the cylinder 101 of the compressor, and an oil drop groove 111 is constructed on the lower end surface. The outlet of the second oil return channel 32 is in the oil drop groove 111 and the oil drop groove 111 protrudes outward from the mating surface along the radial direction of the flange 11, so that the first oil return channel 31 and the second oil return channel 32 can guide the refluxed lubricating oil from the aforementioned oil drop groove 111 to flow back to the oil pool below, thereby reducing the oil discharge rate of the compressor and ensuring that there is sufficient lubricating oil in the compressor.

[0059] According to an embodiment of the present invention, a rotary compressor is also provided, including a pump body assembly, wherein the pump body assembly includes the above-mentioned upper flange for the rotary compressor. The above-mentioned rotary compressor, for example, any one of the rolling rotor compressor, rotary cylinder compressor, vane compressor, and scroll compressor mentioned above, can be a single-cylinder, double-cylinder or multi-cylinder compressor, and the present invention does not specifically limit it.

[0060] by Fig. 9 Taking the rolling rotor compressor shown as an example, the aforementioned pump body assembly also includes main components such as a cylinder 101, a crankshaft 100, a roller 102 and a lower flange 103, wherein a central oil hole 1001 is provided on the crankshaft 100, and a side oil hole 1002 is provided at the root of the lower end of the crankshaft 100 and the upper flange.

[0061] According to an embodiment of the present invention, there is also provided an air conditioner, comprising the above-mentioned rotary compressor.

[0062] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A flange for a rotary compressor, characterized in that: The invention comprises a flange body (1), wherein the flange body (1) comprises a flange plate (11) and an outer cylinder body (12) located on the upper end surface of the flange plate (11), wherein the outer cylinder body (12) has a first central through hole (121) axially passing through two ends of the outer cylinder body (12) along the axial direction of the flange plate (11), an inner cylinder body (2) is coaxially assembled in the first central through hole (121), and the inner cylinder body (2) has a second central through hole (21) axially passing through two ends of the inner cylinder body (2) The second central through hole (21) is used to cooperate with the crankshaft (100) to form a rotating friction pair, a first oil return channel (31) is formed between the inner circular wall surface of the outer cylinder (12) and the outer circular wall surface of the inner cylinder (2), a spiral opening groove (22) is formed on the hole wall surface of the second central through hole (21), and a connecting hole (23) is also constructed in the inner cylinder (2), and the connecting hole (23) is connected between the spiral opening groove (22) and the first oil return channel (31).

2. The upper flange for a rotary compressor according to claim 1, characterized in that: The first oil return flow channel (31) comprises an open groove constructed on one of the outer cylinder (12) and the inner cylinder (2), and a wall surface constructed on the other of the outer cylinder (12) and the inner cylinder (2) and sealedly connected to the notch of the open groove.

3. The upper flange for a rotary compressor according to claim 1 or 2, characterized in that: The material of the inner cylinder (2) is cast iron, and the material density of the outer cylinder (12) is lower than the density of the cast iron.

4. The upper flange for a rotary compressor according to claim 3, characterized in that: The material of the outer cylinder (12) is powder metallurgy.

5. The upper flange for a rotary compressor according to claim 1, characterized in that: The outer cylinder (12) and the inner cylinder (2) are interference-fitted; and / or the flange body (1) is integrally cast, and / or the inner cylinder (2) is formed by milling.

6. The upper flange for a rotary compressor according to claim 1, characterized in that: The ends of the outer cylinder (12) and the inner cylinder (2) close to the inner cavity of the pump body of the compressor are inner ends, and a flexible groove (4) is formed on the end surface of the inner end, and the flexible groove (4) is formed by both the inner cylinder (2) and the outer cylinder (12).

7. The upper flange for a rotary compressor according to claim 6, characterized in that: An inner ring groove (24) is formed on the outer cylinder wall surface of the inner cylinder body (2), and an outer ring groove (122) is formed on the hole wall surface of the first central through hole (121). The longitudinal sections of the inner ring groove (24) and the outer ring groove (122) are both L-shaped, and the outer ring groove (122) and the inner ring groove (24) together form the flexible groove (4).

8. The upper flange for a rotary compressor according to claim 1, characterized in that: A second oil return channel (32) is also constructed in the flange body (1), and the inlet of the second oil return channel (32) is connected to the outlet of the first oil return channel (31) to guide the lubricating oil returning in the first oil return channel (31) to flow back into the compressor oil pool.

9. A rotary compressor, comprising a pump assembly, characterized in that: The pump body assembly comprises the upper flange for a rotary compressor according to any one of claims 1 to 8.

10. An air conditioner, characterized in that: Includes the rotary compressor described in claim 9.

Images