CN118088454A - Compressor with a compressor body having a rotor with a rotor shaft - Google Patents

Abstract

The invention discloses a compressor, which comprises a shell, a frame, an oil pool, a motor and an oil return piece. The rack is arranged at the top of the shell, and an oil return hole is formed in the rack, which is close to the inner side wall of the shell; the oil pool is arranged at the bottom of the shell; the motor is arranged in the shell and above the oil pool, and the stator of the motor and the inner surface of the shell are provided with oil return channels extending along the up-down direction; the oil return piece comprises a first oil return section positioned above the stator and a second oil return section positioned below the stator; the first oil return section is connected with the shell, and a first oil return passage is formed between the first oil return section and the shell; the second oil return section is connected with the shell, and a second oil return passage is formed between the second oil return section and the shell; the first oil return passage is communicated with the oil return hole and the oil return channel, and the second oil return section is communicated with the oil return channel and the oil pool. According to the technical scheme, the drifting loss of the engine oil in the oil return process from the oil return hole of the frame to the oil pool can be reduced, so that the circulation rate of the engine oil of the compressor is improved.

Description

Compressor with a compressor body having a rotor with a rotor shaft

Technical Field

The invention relates to the technical field of compressors, in particular to a compressor.

Background

In the prior art, when the compressor works, engine oil flows from the inner side wall of the compressor shell to an oil pool arranged at the bottom of the shell. In the process of oil backflow, the oil is easy to mix secondarily with the gas along with the disturbance of the gas, and the oil cannot completely flow back to the oil sump but is discharged outside the compressor housing.

Disclosure of Invention

The invention mainly aims to provide a compressor, which aims to reduce the drift loss in the oil return process from an oil return hole of a frame to an oil pool, so as to improve the circulation rate of engine oil of the compressor.

In order to achieve the above purpose, the compressor provided by the invention comprises a shell, a frame, an oil pool, a motor and an oil return piece. The rack is arranged at the top of the shell, and an oil return hole is formed in the rack, which is close to the inner side wall of the shell; the oil pool is arranged at the bottom of the shell; the motor is arranged in the shell and above the oil pool, and the stator of the motor and the inner surface of the shell are provided with oil return channels extending along the up-down direction; the oil return piece comprises a first oil return section positioned above the stator and a second oil return section positioned below the stator; the first oil return section is connected with the shell, and a first oil return passage is formed between the first oil return section and the shell; the second oil return section is connected with the shell, and a second oil return passage is formed between the second oil return section and the shell; the first oil return passage is communicated with the oil return hole and the oil return channel, and the second oil return section is communicated with the oil return channel and the oil pool.

Optionally, the first oil return passage, the oil return passage, and the second oil return passage correspond in the up-down direction.

Optionally, the first oil return passage includes an inlet portion and an outlet portion that are communicated, and a cross-sectional area of the inlet portion is larger than a cross-sectional area of the outlet portion; the inlet portion is communicated with the oil return hole, and the outlet portion is communicated with the oil return passage.

Optionally, a funnel-shaped shrinkage part tapering towards the outlet part is arranged between the inlet part and the outlet part.

Optionally, a projection of the outlet portion on the stator in the up-down direction coincides with at least a portion of the oil return passage.

Optionally, the first oil return section and the second oil return section are integrally formed, and the first oil return passage and the second oil return passage are directly communicated.

Optionally, the first oil return section and the second oil return section are welded to the inner side wall of the shell.

Optionally, the first oil return sections are provided with a plurality of oil return sections, and the first oil return sections are arranged on the inner side wall of the shell at intervals along the circumferential direction of the shell; the second oil return sections are arranged in a plurality of mode, and the second oil return sections are arranged on the inner side wall of the shell at intervals along the circumferential direction of the shell.

Optionally, the middle part of the oil return member is raised to form the first oil return passage or the second oil return passage, and two side edges of the oil return member are bonded and connected with the shell in a sealing manner.

Optionally, the compressor further comprises:

a crankshaft provided in the housing and mounted in an axial direction of the housing;

the vortex disc assembly is arranged at the top of the shell, and the shell is provided with an air suction port communicated with the vortex disc assembly;

A balance member located below the scroll assembly;

The motor is arranged below the balance piece;

The vortex disc assembly, the balance piece and the motor are sequentially arranged on the crankshaft, a cavity is formed between the vortex disc assembly and the motor at intervals, an exhaust port is formed in the side wall of the shell, and the exhaust port is communicated with the cavity and the outside of the shell.

According to the technical scheme, the first oil return section and the second oil return section are arranged between the oil return hole and the oil tank, so that engine oil can smoothly return to the oil tank with low loss and even no loss. Specifically, a first oil return passage is formed between the first oil return section and the casing, a second oil return passage is formed between the second oil return section and the casing, an oil return passage extending along the up-down direction is formed between the edge of the stator and the casing, engine oil flows out from the oil return hole, sequentially passes through the first oil return passage, the oil return passage and the second oil return passage, and finally reaches the oil sump, and the engine oil is protected by the first oil return section and the second oil return section when flowing out from the oil return hole, namely, the first oil return section and the second oil return section can isolate the disturbance of the air flow of the internal cavity of the compressor, so that the engine oil and the gas are secondarily mixed, and the engine oil is discharged out of the compressor along with the gas. Therefore, the first oil return section and the second oil return section effectively prevent the drifting loss of the engine oil in the oil return process from the oil return hole to the oil pool, so that the circulation rate of the engine oil of the compressor is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a compressor according to an embodiment of the present invention;

FIG. 2 is a schematic view of a first oil return section and a second oil return section of an embodiment of a compressor according to the present invention;

FIG. 3 is a schematic view of a compressor according to another embodiment of the present invention;

Fig. 4 is a schematic structural view of a first oil return section and a second oil return section of another embodiment of the compressor according to the present invention.

Reference numerals illustrate:

Reference numerals	Name of the name	Reference numerals	Name of the name
				1	Shell body	2	Rack
21	Oil return hole	3	Oil pool
				4	Motor with a motor housing	41	Active cell
42	Stator	43	Oil return passage
				5	First oil return section	51	First oil return passage
52	Entrance part	53	Outlet part
				54	Shrink mouth	6	A second oil return section
61	Second oil return passage	7	Crankshaft
				8	Vortex disc assembly	81	Movable vortex disk
82	Static vortex disk	9	Balancing piece
				10	Suction port	11	Exhaust port

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

The compressor is generally classified into a piston compressor, a screw compressor, a centrifugal compressor, a linear compressor, and the like. The piston compressor generally consists of a housing 1, an electric motor, a cylinder, a piston, control devices (starter and thermal protector) and a cooling system. The cooling modes include oil cooling and air cooling, and natural cooling. The linear compressor has no shaft and no cylinder, sealing and heat dissipating structure. Compressors used in the refrigeration and air conditioning industry are of 5 major types: reciprocating, screw, rotary, scroll, and centrifugal, where reciprocating is one of the most commonly used compressors in small and medium-sized commercial refrigeration systems. Screw compressors are mainly used in large commercial and industrial systems. Rotary compressors and scroll compressors are mainly used for household and small-capacity commercial air conditioning devices, and centrifugal compressors are widely used for air conditioning systems of large buildings. Domestic refrigerator and air conditioner compressors are nowadays of the volumetric type, which in turn can be divided into reciprocating and rotary type. The reciprocating compressor uses piston, crank, connecting rod mechanism or piston, crank, slide tube mechanism, and the rotary compressor uses rolling rotor. In commercial air conditioners, centrifugal, vortex and screw type air conditioners are also used. The suction pipe of the compressor is connected with the evaporator of the refrigeration system, and the discharge pipe of the compressor is also connected with the condenser of the refrigeration system. When the rotary compressor works, a refrigerant mixture (a mixture of gaseous refrigerant, liquid refrigerant and oil) with low temperature and low pressure in the refrigerating system can enter the liquid storage cavity from the suction pipe, the gaseous refrigerant, the liquid refrigerant and the oil can be separated after the refrigerant mixture enters the liquid storage cavity, the separated gaseous refrigerant is sucked into the return air pipe, then enters the compression cavity of the air cylinder through the return air pipe and is compressed into a refrigerant with high temperature and high pressure in the compression cavity, and then the compressed refrigerant is discharged from the compression cavity of the air cylinder into the compressor cavity and is discharged from the compressor cavity through the exhaust pipe. The liquid refrigerant is stored in the liquid storage cavity, and the separated oil is converged at the bottom of the liquid storage cavity under the action of gravity.

In the present embodiment, a scroll compressor is used, which is a positive displacement compressor, and the compression member is composed of a movable scroll and a fixed scroll. Including a number of structural features that enable a split flow pattern of gas through the compressor housing to reduce entrained oil.

After entering the housing, some gas flows upward to reduce the amount of gas flowing downward toward the oil. To achieve this, the motor of the compressor may be surrounded by a sleeve having upper and lower apertures for directing airflow to the upper and lower stator end turns of the motor. In certain embodiments, the suction inlet is positioned importantly with respect to the two gas passages between the stator and the motor housing. The inlet is positioned such that a channel receives the inlet gas and divides the flow into flows in opposite directions, i.e., upward and downward. The other channels only carry gas upwards. In addition, the oil baffle, diffuser, streamlined counterweight and suction pipe oil catcher can also aid in oil-gas separation or minimize entrained oil.

The invention provides a compressor.

Referring to fig. 1 to 4, in an embodiment of the present invention, the compressor includes:

The device comprises a shell 1 and a frame 2, wherein the frame 2 is arranged at the top of the shell 1, and an oil return hole 21 is formed in the inner side wall, close to the shell 1, of the frame 2;

An oil pool 3 arranged at the bottom of the shell 1;

A motor 4 provided in the housing 1 and above the oil sump 3, wherein a stator 42 of the motor 4 and an inner surface of the housing 1 are formed with an oil return passage 43 extending in an up-down direction; and

An oil return member comprising a first oil return section 5 above the stator 42 and a second oil return section 5 below the stator;

The first oil return section 5 is connected with the housing 1, and a first oil return passage 51 is formed between the first oil return section and the housing 1; the second oil return section 6 is connected with the housing 1, and a second oil return passage 61 is formed between the second oil return section and the housing 1; the first oil return passage 51 communicates with the oil return hole 21 and the oil return passage 43, and the second oil return section 6 communicates with the oil return passage 43 and the oil pool 3.

According to the technical scheme, the first oil return section 5 and the second oil return section 6 are arranged between the oil return hole 21 and the oil tank 3, so that engine oil can smoothly return to the oil tank 3 with low loss and even no loss. Specifically, a first oil return passage 51 is formed between the first oil return section 5 and the casing 1, a second oil return passage 61 is formed between the second oil return section 6 and the casing 1, and an oil return passage 43 extending in the up-down direction is formed between the edge of the stator 42 and the casing 1, oil flows out from the oil return hole 21, passes through the first oil return passage 51, the oil return passage 43 and the second oil return passage 61 in sequence, and finally reaches the oil sump 3, and the oil is protected by the first oil return section 5 and the second oil return section 6 when flowing out from the oil return hole 21, that is, the first oil return section 5 and the second oil return section 6 can isolate disturbance of the air flow of the internal cavity of the compressor, so that the oil and the gas are secondarily mixed, and the oil is discharged out of the compressor along with the gas. Therefore, the first oil return section 5 and the second oil return section 6 effectively prevent the drifting loss of the engine oil in the oil return process from the oil return hole 21 to the oil sump 3, thereby improving the circulation rate of the engine oil of the compressor.

In one embodiment, the first oil return passage 51, the oil return passage 43, and the second oil return passage 61 correspond in the up-down direction. In this way, the oil flowing through the first oil return passage 51 can pass through the oil return passage 43 without being blocked, and the oil flowing through the oil return passage 43 can also flow into the second oil return passage 61 without being blocked. That is, the first oil return passage 51, the oil return passage 43 and the second oil return passage 61 are able to maximize the cross-sectional area of the effective oil passage on the oil return path of the oil inside the casing 1 in the up-down direction, so that the oil return resistance is minimized, and the drift loss of the oil flowing out from the oil return hole 21 is reduced, so that the oil can fall back to the oil pool 3 as completely as possible, the exhaust oil circulation rate of the existing high-pressure chamber scroll compressor is effectively reduced, and the reliability of the scroll compressor and the air conditioning system is improved while the efficiency of the air conditioning system is improved.

Further, the first oil return passage 51 includes an inlet portion 52 and an outlet portion 53 that are communicated, the cross-sectional area of the inlet portion 52 being larger than the cross-sectional area of the outlet portion 53; the inlet portion 52 communicates with the oil return hole 21, and the outlet portion 53 communicates with the oil return passage 43. Since the sectional area of the inlet portion 52 is larger than the sectional area of the outlet portion 53, the flow rate of the oil at the outlet portion 53 is larger than the flow rate of the oil at the inlet portion 52, thereby enabling the oil to flow back into the oil pool 3 more quickly.

In order to make the flow of the oil between the inlet portion 52 and the outlet portion 53 smoother, a necked portion 54 that is funnel-shaped and tapers toward the outlet portion 53 is provided between the inlet portion 52 and the outlet portion 53 of the first oil return passage 51. The tapered structural characteristic of the funnel-shaped reduced-mouth portion 54 is utilized to enable the oil to gradually converge from the inlet portion 52 to the outlet portion 53 and flow from the outlet portion 53 to the oil return passage 43. It should be noted that the funnel shape herein may be, but not limited to, an inverted cone shape, a semi-circular arc shape, or the like.

Further, the projection of the outlet portion 53 onto the stator 42 in the up-down direction coincides with at least part of the oil return passage 43. In an embodiment, the cross-sectional area of the oil return passage 43 is larger than the cross-sectional area of the outlet portion 53, and the projection of the entire outlet portion 53 onto the stator 42 in the up-down direction coincides with the portion of the oil return passage 43, so that the oil in the outlet portion 53 can directly fall into the oil return passage 43 without obstruction. In another embodiment, the cross-sectional area of the oil return passage 43 is equal to the cross-sectional area of the outlet portion 53, and the projection of the entirety of the outlet portion 53 onto the stator 42 in the up-down direction coincides with the entirety of the oil return passage 43, so that the oil in the outlet portion 53 can directly fall into the oil return passage 43 without obstruction.

Further, referring to fig. 3 and 4, the first oil return section 5 is integrally formed with the second oil return section 6, and the first oil return passage 51 is directly communicated with the second oil return passage 61. The first oil return section 5 and the second oil return section 6 may be integrally formed, with the oil return effect and the assembly process being ensured, between the oil return hole 21 and the oil sump 3, while passing through the oil return passage 43. In this way, the passage formed by the first oil return passage 51 and the second oil return passage 61 can be completely sealed, and the oil can be directly returned to the oil pool 3 without generating a drift loss.

The first oil return section 5 and the housing 1 may be connected in various manners, and the second oil return section 6 and the housing 1 may be connected in various manners. Including but not limited to the first oil return section 5 and the second oil return section 6 are welded independently to the inner side wall of the housing 1. In other embodiments, the first oil return section 5 may be screwed to the housing 1, and the second oil return section 6 may be welded to the housing 1. In another embodiment, the first oil return section 5 may be welded to the housing 1, and the second oil return section 6 may be screwed to the housing 1. In yet another embodiment, the first oil return section 5 and the second oil return section 6 are both screwed to the housing 1. However, the present design is not limited to this, and the connection between the first oil return section 5 and the housing 1 and the connection between the second oil return section 6 and the housing 1 can be achieved by clamping or riveting.

Further, since the number of the oil return passages 43 and the oil return holes 21 formed between the stator 42 and the housing 1 may be plural, the first oil return section 5 and the second oil return section 6 may be provided in plural corresponding to the oil return passages 43 and the oil return holes 21. Specifically, the first oil return sections 5 are disposed on the inner side wall of the casing 1 at intervals along the circumferential direction of the casing 1; the second oil return sections 6 are arranged on the inner side wall of the shell 1 at intervals along the circumferential direction of the shell 1. In an embodiment, the oil return holes 21 are disposed in the frame 2 and four oil return channels 43 are disposed along the circumferential direction of the housing 1, four oil return channels 43 are disposed between the stator 42 and the housing 1 and correspond to the oil return holes 21 in the up-down direction, four first oil return sections 5 are disposed along the up-down direction and correspond to the oil return holes 21 and the oil return channels 43, and four second oil return sections 6 are disposed along the up-down direction and correspond to the oil return channels 43.

Specifically, the first oil return section 5 and the second oil return section 6 are sheet metal parts. The sheet metal part is a product processed by a sheet metal process and is manufactured by filament power winding, laser cutting, heavy processing, metal bonding, metal drawing, plasma cutting, precision welding, roll forming, sheet metal bending forming, die forging and water jet cutting. However, the present design is not limited thereto, and in other embodiments, the first oil return section 5 and the second oil return section 6 may be other types of workpieces, such as injection molding or forging, etc. Further, the middle portion of the oil return member is raised to form the first oil return passage 51 or the second oil return passage 61, and both side edges of the oil return member are fitted and connected with the housing 1 in a sealing manner.

In more detail, in the present embodiment, the compressor further includes:

a crankshaft 7 provided in the housing 1 and mounted in an axial direction of the housing 1;

a scroll assembly 8 provided at the top of the casing 1, the casing 1 being provided with an air suction port 10 communicating with the scroll assembly 8;

a balance 9 located below the scroll assembly 8;

The motor 4 comprises a stator 42 and a rotor 41, and is arranged below the balance piece 9;

the scroll assembly 8, the balance piece 9 and the motor 4 are sequentially arranged on the crankshaft 7, a cavity is formed between the scroll assembly 8 and the motor 4 at intervals, an exhaust port 11 is formed in the side wall of the shell 1, and the exhaust port 11 is communicated with the cavity and the outside of the shell 1.

Specifically, the scroll assembly 8 includes a movable scroll 81 and a fixed scroll 82, the fixed scroll 82 is fixed on the housing 1, the movable scroll 81 is disposed on the crankshaft 7, and a mixture of the refrigerant and the oil entering from the suction pipe enters the cavity of the housing 1 after passing through the cavity where the fixed scroll 82 and the movable scroll 81 are located. In the chamber, oil-gas separation is achieved by cyclone separation of the balance member 9 and cooperation of the housing 1, gas flows out from the exhaust port 11 of the chamber, and engine oil flows down along the inner side wall of the housing 1 and finally flows into the oil pool 3. The engine oil sequentially flows through the oil return channel 43 between the stator 42 and the housing 1 along the housing 1, and then flows through the oil return groove of the oil baffle plate, and finally flows to the oil sump 3 at the bottom of the housing 1.

Further, the movable vortex plate 81 is sleeved on the crankshaft 7, the movable vortex plate 81 enables the air suction port 10 at the top of the shell 1 to continuously suck air in the continuous rotation process, an oil suction channel penetrating through the crankshaft 7 is arranged in the axial direction of the crankshaft 7, an oil pool 3 is connected to the lower end of the oil suction channel, the upper end of the oil suction channel extends to the top of the shell 1, and an oil path is formed by the oil suction channel and the oil return channel 43. Through the oil way, engine oil can move to parts inside the compressor so as to ensure safe operation of the compressor, and particularly reduce friction consumption of the compressor.

The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.

Claims (10)

1. A compressor, comprising:

The oil return device comprises a shell and a rack, wherein the rack is arranged at the top of the shell, and an oil return hole is formed in the rack, which is close to the inner side wall of the shell;

The oil pool is arranged at the bottom of the shell;

The motor is arranged in the shell and above the oil pool, and a stator of the motor and the inner surface of the shell are provided with oil return channels extending along the up-down direction; and

The oil return piece comprises a first oil return section positioned above the stator and a second oil return section positioned below the stator;

The first oil return section is connected with the shell, and a first oil return passage is formed between the first oil return section and the shell; the second oil return section is connected with the shell, and a second oil return passage is formed between the second oil return section and the shell; the first oil return passage is communicated with the oil return hole and the oil return channel, and the second oil return section is communicated with the oil return channel and the oil pool.

2. The compressor according to claim 1, wherein the first oil return passage, the oil return passage, and the second oil return passage correspond in an up-down direction.

3. The compressor of claim 1, wherein said first oil return passage includes an inlet portion and an outlet portion in communication, said inlet portion having a cross-sectional area greater than a cross-sectional area of said outlet portion;

The inlet portion is communicated with the oil return hole, and the outlet portion is communicated with the oil return passage.

4. A compressor as claimed in claim 3, wherein a funnel-shaped constriction is provided between said inlet portion and said outlet portion, tapering towards said outlet portion.

5. A compressor according to claim 3, wherein the projection of the outlet portion in the up-down direction on the stator coincides with at least part of the oil return passage.

6. The compressor of claim 1, wherein the first oil return section is integrally formed with the second oil return section, and the first oil return passage is in direct communication with the second oil return passage.

7. The compressor of claim 1, wherein the first oil return section and the second oil return section are independently welded to an inner sidewall of the housing.

8. The compressor of claim 1, wherein a plurality of first oil return sections are provided, the first oil return sections being disposed at intervals on an inner side wall of the casing in a circumferential direction of the casing;

the second oil return sections are arranged in a plurality of mode, and the second oil return sections are arranged on the inner side wall of the shell at intervals along the circumferential direction of the shell.

9. The compressor of claim 1, wherein a central portion of the oil return member is bulged to form the first oil return passage or the second oil return passage, and both side edges of the oil return member are engaged and sealingly connected with the housing.

10. The compressor of claim 9, further comprising:

a crankshaft provided in the housing and mounted in an axial direction of the housing;

the vortex disc assembly is arranged at the top of the shell, and the shell is provided with an air suction port communicated with the vortex disc assembly;

A balance member located below the scroll assembly;

The motor is arranged below the balance piece;

The vortex disc assembly, the balance piece and the motor are sequentially arranged on the crankshaft, a cavity is formed between the vortex disc assembly and the motor at intervals, an exhaust port is formed in the side wall of the shell, and the exhaust port is communicated with the cavity and the outside of the shell.