CN107859626A - A kind of high efficient oil separation screw compressor and its oil separating method - Google Patents

Abstract

The invention belongs to the technical field of refrigeration compressors, in particular to a high-efficiency oil separation scroll compressor and an oil separation method thereof. In the present invention, one end of the exhaust pipe of the compressor passes through the casing and the motor protection cover to penetrate into the space where the upper balance weight is located, and the motor protection cover divides the upper space of the motor into the space where the balance weight resides and the space outside the motor protection cover. When the compressor is energized and running, the motor drives the movable scroll through the crankshaft to perform translational motion. The low-temperature and low-pressure refrigerant enters through the suction pipe, and after being compressed by the movable scroll, it becomes a high-temperature and high-pressure oil-gas mixed gas, and passes through the fixed scroll. The air is discharged from the exhaust port of the motor, flows through the external space formed between the motor protective cover and the housing, the outside of the motor stator, reaches the oil pool at the bottom of the compressor, and then flows upward through the gap between the stator and the rotor, passing through the upper balance weight, Finally, it is discharged through the exhaust pipe. The invention not only makes the cooling of the motor more sufficient, but also ensures that more lubricating oil remains inside the compressor through the power oil separation method.

Description

A high-efficiency oil separation scroll compressor and its oil separation method

technical field

The invention belongs to the technical field of refrigeration compressors, in particular to a high-efficiency oil separation scroll compressor and an oil separation method thereof.

Background technique

Oil circulation rate (OCR) is one of the important performance indicators of air-conditioning refrigeration compressors. This parameter directly affects the energy efficiency of the system. For scroll compressors, a large amount of oil enters the compression chamber and then participates in the refrigerant cycle, which will reduce the heat exchange efficiency of the system and affect energy efficiency. At the same time, due to the limited internal oil storage capacity of the compressor, a large amount of lubricating oil enters the system, which may also bring risks to the lubrication reliability of the compressor. Therefore, it is very important to separate the lubricating oil from the gas in the compressor and keep more lubricating oil inside the compressor.

Currently, in high-pressure side compressor designs, oil separation is accomplished by vectoring the velocity of the oil-gas mixture using a separate or combined metal plate. As shown in Figure 1. The design of the compressor in Fig. 1a is to add a cover 54 from the crankcase 28 to the upper end of the motor stator 23, and fix it on the crankcase 28 by screws 60. The cover 54 divides the space where the balance weight B is located and the space where the discharge pipe 62 is located into two parts, and the cover 54 will prevent the oil flowing out from the bearing 30 from being directly discharged into the system through the exhaust pipe 50 . A similar idea is adopted in FIG. 1 b , the difference is that the cover 54 also covers the winding wire at the upper end of the stator 23 . However, these compressors restrict the flow of gas between the stator and rotor, which is not conducive to the sufficient cooling of the motor.

Contents of the invention

In order to overcome the above defects, the present invention provides a high-efficiency oil separation scroll compressor, which can not only fully cool the motor of the compressor, but also ensure that more lubricating oil remains inside the compressor.

In order to realize the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

A high-efficiency oil-separated scroll compressor, including a shell, a crankshaft, an upper frame, a lower frame, a motor, a fixed scroll with an exhaust port, a movable scroll, a suction pipe, an oil pool, and a motor Including a stator and a rotor, it is characterized in that the compressor also includes an exhaust pipe, an upper balance weight, and a motor protection cover. The motor protection cover separates the upper space of the motor into the space where the balance weight is located and the outer space of the motor protection cover. One end of the air pipe passes through the casing, the motor protection cover and goes deep into the space where the upper balance weight is located.

Further, the space where the upper balance weight is located is the space formed by the upper frame, the motor and the motor protection cover.

Further, the space outside the motor protection cover is the space formed between the motor protection cover and the casing.

Further, the upper balance weight has radial straight grooves or spiral grooves in the direction of rotation on the side facing the motor.

Further, the upper balance weight has blades protruding radially or in the direction of rotation on the side facing the motor.

The oil separation method of the above-mentioned high-efficiency oil separation scroll compressor, when the compressor is energized and running, the motor drives the movable scroll through the crankshaft to perform translational motion, the low-temperature and low-pressure refrigerant enters through the suction pipe, and after being compressed by the movable scroll, it becomes high-temperature The high-pressure oil-gas mixed gas is discharged through the exhaust port of the fixed scroll, flows through the external space formed between the motor protection cover and the casing, the outside of the motor stator, and reaches the oil pool at the bottom of the compressor, thereby completing the process successively. Cool the outside of the motor and the oil pool, and then flow upward through the gap between the stator and the rotor, pass through the upper balance weight, and finally discharge through the exhaust pipe and enter the system.

Furthermore, when passing the upper balance weight, the upper balance weight rotates under the drive of the crankshaft, and the oil-air mixed gas flowing through the balance weight generates strong centrifugal force, the gas and liquid are separated, the liquid flows into the oil pool along the motor protection cover, and the gas continues to go upward from the exhaust pipe into the system.

A high-efficiency oil-separated scroll compressor, including a shell, a crankshaft, an upper frame, a lower frame, a motor, a fixed scroll with an exhaust port, a movable scroll, a suction pipe, an oil pool, and a discharge Air pipe 8, upper balance weight, described upper balance weight has groove or protrusion.

Further, the upper balance weight has radial straight grooves or spiral grooves in the direction of rotation on the side facing the motor.

Further, the upper balance weight has blades protruding radially or in the direction of rotation on the side facing the motor.

Compared with the prior art, the beneficial effect of the present invention is: the present invention allows the gas to pass through the gap between the rotor and the stator by controlling the gas circulation. When the oil-liquid mixed gas passes through the balance weight, the high-speed rotating balance weight will change the mixing The flow direction of the gas is controlled, and the blades or blade-like groove structures arranged on the lower end surface of the balance weight are used to make the oil and gas separate more fully under the action of centrifugal force. The invention not only makes the cooling of the motor more sufficient, but also ensures that more lubricating oil remains inside the compressor through the power oil separation method. The invention improves the oil separation efficiency inside the compressor, makes the oil circulation rate (OCR) lower, the energy efficiency of the system is higher, the compressor is more reliable, and the compressor has a simple structure and is easy to realize.

Description of drawings

Figure 1 Schematic diagram of the existing compressor structure;

Fig. 2 is a structural schematic diagram of a compressor of the present invention;

In the figure, 1. Shell, 2. Upper frame, 3. Fixed scroll, 4. Moving scroll, 5. Lower frame, 6. Upper balance weight, 7. Motor, 8. Exhaust pipe, 9. Suction pipe, 12. Exhaust port, 13. Oil pool, 23. Motor protection cover, 71. Crankshaft, 72. Stator, 73. Rotor

Fig. 3 is a structural schematic diagram of the balance weight used in the compressor of the present invention.

Detailed ways

The present invention will be further described below in combination with specific embodiments.

A high-efficiency oil-separating scroll compressor, including a housing 1, a crankshaft 71, an upper frame 2, a lower frame 5, a motor 7, a fixed scroll 3 with an exhaust port 12, a movable scroll 4, The suction pipe 9, the oil pool 13, the motor 7 include a stator 72 and a rotor 73, the crankshaft 71 is fixed on the upper frame 2 and the lower frame 5, the fixed scroll 3 is fixed on the upper frame by bolts, and the movable scroll The disc 4 is set on the upper end of the crankshaft 71, and the oil pool 13 is located at the bottom of the compressor. The compressor also includes an exhaust pipe 8, an upper balance weight 6, and a motor protection cover 23. The motor protection cover 23 separates the upper space of the motor into a space where the balance weight is space and the outer space of the motor protection cover, one end of the exhaust pipe 8 passes through the housing 1, the motor protection cover 23 and goes deep into the space where the upper balance weight is located, and the space where the upper balance weight is located is formed by the upper frame 2, the motor 7 and the motor protection cover 23 space. The outer space of the motor protection cover is the space formed between the motor protection cover 23 and the casing 1 , and this space is a passage for the high-pressure and high-temperature oil-gas mixed gas to flow through. The external space formed between the motor protection cover 23 and the casing 1 is not communicated with the space where the upper balance weight is located. The upper balance weight has radial straight grooves or spiral grooves in the direction of rotation on the side facing the motor; the upper balance weight may also have protruding blades along the radial direction or in the direction of rotation on the side facing the motor.

The high-efficiency oil separation method using the above-mentioned compressor is as follows: when the compressor is energized and running, the motor drives the movable scroll through the crankshaft to perform translational motion, and the low-temperature and low-pressure refrigerant enters through the suction pipe, and after being compressed by the movable scroll, it becomes high-temperature and high-pressure The mixed gas of oil and gas is discharged through the exhaust port of the fixed scroll, flows through the external space formed between the motor protection cover and the casing and the outside of the motor stator, and reaches the oil pool at the bottom of the compressor, thereby completing the alignment successively. The cooling on the outside of the motor and the oil pool flows upward through the gap between the stator and the rotor, passes through the upper balance weight, and finally is discharged through the exhaust pipe 8 and enters the system. The upper balance weight has straight grooves in the radial direction (Figure 3b) or spiral grooves in the direction of rotation (Figure 3c) on the side facing the motor. When passing through the upper balance weight, the upper balance weight is generally in the shape of "Z" or "L". The upper balance weight rotates under the drive of the crankshaft, forming an umbrella-like cover, blocking the flow of mixed gas of oil and gas, and generating strong centrifugal force to promote Gas-liquid separation, so as to avoid the high-temperature and high-pressure oil-air mixture directly flowing into the system through the exhaust pipe, but under the action of high-speed centrifugal force, the oil is separated from the oil-air mixture and flows back to the oil pool of the compressor along the motor protection cover bottom, while the gas continues upwards, thereby being expelled into the system through the exhaust pipe.

The upper balance weight can be used in one of the following four structures: (1) The upper balance weight 6 has radial straight grooves on the side facing the motor; (2) The upper balance weight 6 has a spiral in the direction of rotation on the side facing the motor Groove; (3) The upper balance weight 6 has blades protruding along the radial direction on the side facing the motor; (4) The upper balance weight 6 has blades protruding along the rotation direction on the side facing the motor.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (10)

1. a kind of high efficient oil separates screw compressor, including housing（1）, bent axle（71）, upper spider（2）, lower bearing bracket（5）, motor （7）, with exhaust outlet（12）Determine vortex disk（3）, orbiter（4）, air intake duct（9）, oil sump（13）, motor（7）Including fixed Son（72）And rotor（73）, it is characterised in that the compressor also includes blast pipe（8）, upper balance weight（6）, motor protecting cover （23）, motor protecting cover（23）Space and motor protecting cover exterior space, institute where motor upper space is separated into balance weight State blast pipe（8）One end passes through housing（1）, motor protecting cover（23）And deeply go up balance weight place space.

2. high efficient oil as claimed in claim 1 separates screw compressor, it is characterised in that space where upper balance weight is upper machine Frame（2）, motor（7）And motor protecting cover（23）The space of formation.

3. high efficient oil as claimed in claim 1 separates screw compressor, it is characterised in that motor protecting cover exterior space is electricity Machine protective cover（23）With housing（1）Between the space that is formed.

4. high efficient oil as claimed in claim 1 separates screw compressor, it is characterised in that the upper balance weight（6）Towards There are radial direction straight flute or the spiral grooves of direction of rotation in motor side.

5. high efficient oil as claimed in claim 1 separates screw compressor, it is characterised in that the upper balance weight（6）Towards Motor side has radially or the raised blade in direction of rotation.

6. use the oil separating method of high efficient oil as claimed in claim 1 separation screw compressor, it is characterised in that compressor Motor when operating that is powered drives orbiter to carry out translation by bent axle, and low-temp low-pressure refrigerant enters through air intake duct, through dynamic vortex After disk compression, become the air-fuel mixture state gas of HTHP, and discharged by the exhaust outlet of determine vortex disk, flow through electric motor protecting Cover formed between housing exterior space, on the outside of the stator of motor, the oil sump of compression motor spindle is reached, so as to be successively performed pair Motor outside, the cooling of oil sump, then by determining the gap of word and rotor, flow up, by upper balance weight, finally through blast pipe Discharge, into system.

7. oil separating method as claimed in claim 6, it is characterised in that in process during balance weight, upper balance weight is in bent axle Drive it is lower rotate, the air-fuel mixture state gas for flowing through balance weight produces strong centrifugal force, gas-liquid separation, and liquid is along motor protecting cover Oil sump is flowed into, gas then continues up to be discharged in system from blast pipe.

8. a kind of high efficient oil separates screw compressor, including housing（1）, bent axle（71）, upper spider（2）, lower bearing bracket（5）, motor （7）, with exhaust outlet（12）Determine vortex disk（3）, orbiter（4）, air intake duct（9）, oil sump（13）, blast pipe（8）, it is upper flat Weigh block（6）, it is characterised in that the upper balance weight（6）With groove or projection.

9. high efficient oil as claimed in claim 8 separates screw compressor, it is characterised in that the upper balance weight（6）Towards There are radial direction straight flute or the spiral grooves of direction of rotation in motor side.

10. high efficient oil as claimed in claim 8 separates screw compressor, it is characterised in that the upper balance weight（6）Towards Motor side has radially or the raised blade in direction of rotation.