CN110966201A - Compressor lubricating oil backflow structure and compressor - Google Patents

Abstract

The invention provides a compressor lubricating oil backflow structure and a compressor. Wherein compressor lubricating oil backflow structure, including the shell body, be equipped with upper bracket, bent axle in the shell body, the bottom of shell body is equipped with bottom oil bath, the bent axle is rotatable connect in on the upper bracket, it has the oil storage chamber to construct on the upper bracket, the oil storage chamber be used for right by the bent axle is followed the lubricating oil that bottom oil bath pump sending came is saved, the oil storage chamber has the oil return subassembly, the oil return subassembly includes back oil pipe way, the one end that returns oil pipe way is in the oil storage intracavity, the other end is in under the lubricating oil liquid level in the bottom oil bath. The compressor lubricating oil backflow structure and the compressor provided by the invention can effectively reduce the disturbance of the exhaust refrigerant to the lubricating oil in the process of lubricating oil backflow and flow, and further reduce the amount of the lubricating oil wrapped by the exhaust refrigerant, so that the sufficient amount of the lubricating oil in the bottom oil pool is ensured.

Description

Compressor lubricating oil backflow structure and compressor

Technical Field

The invention belongs to the technical field of compressors, and particularly relates to a lubricating oil backflow structure of a compressor and the compressor.

Background

The scroll compressor has the advantages of simple structure, small volume, light weight, low noise, high mechanical efficiency, stable operation and the like, and along with the development of the technology, the compressor develops towards the high-speed direction, and has higher and more requirements on the lubrication of the oil way of the compressor. In the scroll compressor, the lubricating oil is used for cooling and lubricating the motor and the friction pair part of each bearing, so that the friction power consumption is reduced, and the operation efficiency of the compressor is improved. In the scroll compressor, the lubricating oil is generally located at the bottom of the compressor and is delivered to other parts of the compressor through an oil passage in an oil pump and a crankshaft, meanwhile, an oil storage part is arranged on the upper bracket and is used for temporarily storing the lubricating oil provided to the pump body, and redundant lubricating oil at the oil storage part can flow downwards to return to a bottom oil pool, so that a lubricating oil loop is formed and is continuously circulated. However, in this oil return method, the lubricating oil is allowed to vertically fall back to the bottom oil pool, and at least two subsequent disadvantages exist: firstly, the lubricating oil dropped back from the upper bracket easily drops to the upper end of the motor stator to form a residence, and cannot flow back to the bottom, so that the amount of the lubricating oil in the bottom oil pool is relatively small; secondly, the dropping process of the lubricating oil dropped back from the upper bracket is in an exhaust high-pressure environment, the lubricating oil is easily disturbed by the exhaust refrigerant airflow, a gas-liquid mixed state is formed, and the lubricating oil is discharged into an air conditioning system from a compressor exhaust pipe, so that on one hand, the lubricating oil in the pump body is insufficient, and on the other hand, the lubricating oil in the air conditioning system is easily overlarge, and the energy efficiency of the system is reduced.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to provide a compressor lubricating oil backflow structure and a compressor, which can effectively reduce the disturbance of the exhaust refrigerant to the lubricating oil in the lubricating oil backflow and flow-down process, and further reduce the amount of the lubricating oil wrapped by the exhaust refrigerant, so as to ensure that the amount of the lubricating oil in the bottom oil pool is sufficient.

In order to solve the above problems, the present invention provides a compressor lubricant oil backflow structure, which includes an outer casing, an upper bracket and a crankshaft are disposed in the outer casing, a bottom oil pool is disposed at the bottom of the outer casing, the crankshaft is rotatably connected to the upper bracket, an oil storage cavity is configured on the upper bracket, the oil storage cavity is used for storing lubricant oil pumped from the bottom oil pool by the crankshaft, an oil return assembly is disposed on the oil storage cavity, the oil return assembly includes an oil return pipeline, one end of the oil return pipeline is located in the oil storage cavity, and the other end of the oil return pipeline is located below the lubricant oil level in the bottom oil pool.

Preferably, the oil return subassembly still includes the buffering oil sump, the buffering oil sump set up in the shell body, return oil pipe including can with the buffering oil sump with the first pipeline section of oil storage chamber intercommunication, and can with the buffering oil sump with the second pipeline section of bottom oil sump intercommunication.

Preferably, the buffer oil pool is formed by enclosing an oil pool shell, and the oil pool shell is provided with a bottom wall and a vertical wall connected with the bottom wall.

Preferably, one side of the bottom wall is connected with the inner wall of the outer shell, and the vertical wall is arranged opposite to the inner wall to form the buffer oil pool; or the vertical wall and the bottom wall are respectively connected with the upper bracket to form the buffer oil pool.

Preferably, the height from the oil inlet of the second pipe section to the bottom wall is H, the height from the oil outlet of the first pipe section to the bottom wall is H, and H is greater than H.

Preferably, a motor assembly is further arranged on the crankshaft, and the buffer oil pool is located in an upper area of the motor assembly and in a lower area of the upper bracket.

Preferably, the motor assembly comprises a stator, the stator is provided with through holes, the through holes penetrate through two axial ends of the stator, and the second pipe section is inserted into the through holes.

Preferably, an oil pump is arranged at one end of the crankshaft, which is far away from the upper bracket, a main oil conveying channel is configured on the crankshaft, and the oil pump pumps the lubricating oil in the bottom oil pool into the oil storage cavity through the main oil conveying channel.

The invention also provides a compressor, which comprises the compressor lubricating oil backflow structure.

The compressor lubricating oil backflow structure and the compressor provided by the invention can enable excessive lubricating oil in the oil storage cavity to flow back to the position below the lubricating oil liquid level of the bottom oil pool through the relatively independent oil return pipeline, can effectively reduce disturbance of an exhaust refrigerant to the lubricating oil in the lubricating oil backflow and falling process, and further reduce the amount of the lubricating oil wrapped by the exhaust refrigerant, so that the sufficient amount of the lubricating oil in the bottom oil pool is ensured, and meanwhile, when the compressor is applied to an air conditioning system, the amount of the lubricating oil wrapped by the exhaust refrigerant is reduced, so that the energy efficiency of the system can be ensured.

Drawings

Fig. 1 is a schematic view of an internal structure of a compressor according to an embodiment of the present invention, illustrating a compressor lubricant oil returning structure;

FIG. 2 is a schematic layout of a second tube segment at the motor assembly of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

fig. 4 is a schematic view of an internal structure of a compressor according to another embodiment of the present invention.

The reference numerals are represented as:

1. an outer housing; 2. an upper bracket; 21. an oil storage chamber; 3. a crankshaft; 31. a main oil transfer passage; 4. a bottom oil sump; 51. an oil return conduit; 511. a first tube section; 512. a second tube section; 52. a buffer oil pool; 53. an oil sump housing; 531. a bottom wall; 532. erecting a wall; 61. a stator; 611. a via hole; 62. a rotor; 71. an oil pump; 81. a static scroll pan; 82. a movable scroll pan; 83. a lower bracket; 84. an air inlet pipe.

Detailed Description

Referring to fig. 1 to 4 in combination, according to an embodiment of the present invention, there is provided a compressor lubricant oil backflow structure, including an outer casing 1, an upper bracket 2, a crankshaft 3, a lower bracket 83, a fixed scroll 81, a movable scroll 82 and a motor assembly are arranged in the outer casing 1, a bottom oil pool 4 is arranged at the bottom of the outer casing 1, the crankshaft 3 is rotatably connected to the upper bracket 2 and the lower bracket 83, the upper bracket 2 is further used for mounting the fixed scroll 81 and the movable scroll 82, the motor assembly is used for driving the crankshaft 3 to rotate, the rotating crankshaft 3 can drive the movable scroll 82 to move (translate) so as to enable the fixed scroll 81 and the movable scroll 82 to form scroll compression through a refrigerant entering from an air inlet pipe 84, an oil storage cavity 21 is formed on the upper bracket 2, an oil pump 71 is arranged at one end of the crankshaft 3 away from the upper bracket 2, a main oil delivery channel 31 is formed on the crankshaft 3, the oil pump 71 will lubricating oil via in the bottom oil bath 4 the main oil transfer passageway 31 pump extremely in the oil storage chamber 21, oil storage chamber 21 be used for to by crankshaft 3 is followed lubricating oil that bottom oil bath 4 pump sent comes is stored and can be with wherein partial lubricating oil of storage carry to the fitting surface department of orbiting scroll 82 and quiet scroll 81, oil storage chamber 21 is last to have an oil return subassembly, the oil return subassembly includes oil return pipeline 51, oil return pipeline 51's one end is in the oil storage chamber 21, the other end is in under the lubricating oil liquid level in bottom oil bath 4. Among this technical scheme, can with too much lubricating oil in the oil storage chamber 21 flows back to under the lubricating oil liquid level of bottom oil bath 4 through relatively independent oil return pipe 51, can effectively reduce the disturbance of the in-process exhaust refrigerant of lubricating oil backflow and flow to lubricating oil, and then reduce the volume of the lubricating oil that is wrapped up in by the exhaust refrigerant, thereby guarantee the sufficient of lubricating oil volume in bottom oil bath 4, when the compressor is applied to air conditioning system simultaneously, because the lubricating oil volume that wraps up in the exhaust refrigerant reduces, thereby can guarantee the efficiency of system.

Further, the oil return assembly further includes a buffer oil pool 52, the buffer oil pool 52 is disposed in the outer shell 1, and the oil return pipeline 51 includes a first pipe segment 511 capable of communicating the buffer oil pool 52 with the oil storage cavity 21, and a second pipe segment 512 capable of communicating the buffer oil pool 52 with the bottom oil pool 4, in the technical scheme, the buffer oil pool 52 realizes oil-gas separation of the lubricating oil mixed with the refrigerant, which enters the first pipe segment 511, and the lubricating oil subjected to the oil-gas separation enters the bottom oil pool 4 through the second pipe segment 512 again and directly enters below the liquid level of the lubricating oil in the bottom oil pool 4, so that disturbance of the bottom oil pool 4 caused by upward separation of the gas-phase refrigerant after the lubricating oil mixed with the gas-phase refrigerant directly enters the bottom oil pool 4 can be prevented. Furthermore, dividing the oil return pipe 51 into the first pipe segment 511 and the second pipe segment 512 which are independent from each other can reduce the length of the oil return pipe 51, which can facilitate the installation and fixation of the oil return pipe 51 in the outer shell 1.

As a specific embodiment, preferably, the buffer oil pool 52 is enclosed by an oil pool housing 53, the oil pool housing 53 has a bottom wall 531 and a vertical wall 532 connected thereto, for example, fig. 1, one side of the bottom wall 531 is connected with an inner wall of the outer housing 1, and the vertical wall 532 is arranged opposite to the inner wall to form the buffer oil pool 52; alternatively, for example, in fig. 4, the upright wall 532 and the bottom wall 531 are respectively connected to the upper frame 2 to form the buffer oil pool 52. It is understood that the connection between the bottom wall 531 and the upright wall 532 and the inner wall of the outer case 1 or the connection between the upper bracket 2 should be sealed.

Furthermore, the height from the oil inlet of the second pipe section 512 to the bottom wall 531 is H, the height from the oil outlet of the first pipe section 511 to the bottom wall 531 is H, and H > H, so that a certain amount of lubricating oil can be stored in the buffer oil pool 52, and further, the buffer oil pool 52 is located in the upper area of the motor assembly and in the lower area of the upper bracket 2, that is, the buffer oil pool 52 is located between the upper bracket 2 and the motor assembly. In this case, it is preferable that a corresponding lubricant outlet is formed in the sump housing 53, and the lubricant outlet can communicate with a high temperature position of a lower member (for example, a motor assembly) through the lubricant outlet, so that the high temperature position of the lower member can be cooled.

Preferably, the motor assembly includes a stator 61 and a rotor 62, the stator 61 has through holes 611, the through holes 611 penetrate through both axial ends of the stator 61, and the second pipe segment 512 is inserted into the through holes 611.

According to an embodiment of the present invention, there is also provided a compressor, preferably a scroll compressor, including the above-described compressor lubricating oil backflow structure.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (9)

1. Compressor lubricating oil backflow structure, its characterized in that, including shell body (1), be equipped with upper bracket (2), bent axle (3) in shell body (1), the bottom of shell body (1) is equipped with bottom oil bath (4), bent axle (3) rotatable connect in on upper bracket (2), it has oil storage chamber (21) to construct on upper bracket (2), oil storage chamber (21) be used for right by bent axle (3) are followed the lubricating oil that bottom oil bath (4) pump sending comes stores, the oil return subassembly has on oil storage chamber (21), the oil return subassembly includes oil return pipe (51), the one end of oil return pipe (51) is in oil storage chamber (21), the other end is in under the lubricating oil liquid level in bottom oil bath (4).

2. The return flow structure according to claim 1, wherein the oil return assembly further includes a buffer oil sump (52), the buffer oil sump (52) is provided in the outer housing (1), and the oil return pipe (51) includes a first pipe section (511) capable of communicating the buffer oil sump (52) with the oil storage chamber (21), and a second pipe section (512) capable of communicating the buffer oil sump (52) with the bottom oil sump (4).

3. The return flow structure according to claim 2, wherein the buffer oil sump (52) is enclosed by an oil sump housing (53), the oil sump housing (53) having a bottom wall (531) and a standing wall (532) connected thereto.

4. The backflow structure according to claim 3, wherein one side of the bottom wall (531) is connected to an inner wall of the outer case (1), and the standing wall (532) is disposed opposite to the inner wall to form the buffer oil sump (52); or the vertical wall (532) and the bottom wall (531) are respectively connected with the upper bracket (2) to form the buffer oil pool (52).

5. The return structure according to claim 3, characterized in that the oil inlet of the second pipe section (512) has a height H from the bottom wall (531), and the oil outlet of the first pipe section (511) has a height H from the bottom wall (531), H > H.

6. The return flow structure according to claim 3, characterized in that a motor assembly is further provided on the crankshaft (3), and the buffer oil sump (52) is located in an upper region of the motor assembly and in a lower region of the upper bracket (2).

7. The oil return structure according to claim 6, wherein the motor assembly comprises a stator (61), the stator (61) is provided with through holes (611), the through holes (611) penetrate through two axial ends of the stator (61), and the second pipe section (512) is inserted into the through holes (611).

8. The return flow structure according to claim 1, wherein an end of the crankshaft (3) remote from the upper bracket (2) is provided with an oil pump (71), the crankshaft (3) is configured with a main oil delivery passage (31), and the oil pump (71) pumps the lubricating oil in the bottom oil sump (4) into the oil storage chamber (21) through the main oil delivery passage (31).

9. A compressor comprising an oil return structure, wherein the oil return structure is the compressor lubricant oil return structure of any one of claims 1 to 8.

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