CN114294232B - Oil separation device for reducing oil discharge rate and rotary compressor - Google Patents

Abstract

An oil separation device and a rotary compressor for reducing the oil discharge rate. The oil separation device includes a guide part for changing the direction of the airflow and a fixing part connected with the muffler. The guide part is composed of two parts: an arc surface and an extending rib. The shaped surface is extended along the outer circumference of the muffler exhaust hole to the top of the muffler exhaust hole, and the extended rib is connected to the edge of the arc surface; the fixing part is used to connect the arc surface and the extended rib to the outer surface of the muffler ; The airflow discharged from the exhaust hole of the muffler is discharged horizontally through the channel formed by the arc surface and the extended rib. Because the rotary compressor of the present invention is installed with the above-mentioned oil separation device, the air flow direction of the refrigerant is changed, the oil-gas separation efficiency is improved, and the oil discharge rate is lower; during unsteady operation such as cold start, the amount of lubricating oil in the oil pool can be guaranteed, So as to ensure the mixed viscosity of refrigerant/lubricating oil in the oil pool and the reliability of the compressor. The oil separation device will not affect the noise reduction effect and increase the power consumption of the compressor.

Description

Oil separation device and rotary compressor for reducing oil discharge rate

technical field

The invention belongs to the technical field of compressors, and in particular relates to an oil separation device and a rotary compressor for reducing the oil discharge rate.

Background technique

Lubricating oil plays an important role in lubrication, sealing, cooling, and noise reduction in the compressor, so it is necessary to ensure that there is enough lubricating oil in the oil pool during the operation period. During the operation of the compressor, the end of the crankshaft extends into the lubricating oil pool at the bottom of the compressor, and the lubricating oil is supplied to each friction pair through the oil stirring plate in the center oil hole to ensure the smooth operation of each friction pair. Lubricating oil exists in the gaps of various parts in the compressor, and reduces the leakage of refrigerant by sealing the leakage channels, thereby ensuring the volumetric efficiency and capacity of the compressor.

When the compressor is running in a steady state, the lubricating oil with different leakage gaps enters the cylinder under the action of the pressure difference. The lubricating oil and the refrigerant form an oil-air mixture during the compression process, and then are discharged from the muffler. At the same time, part of the lubricating oil at the outlet of the upper spiral oil tank is broken into oil droplets under the action of the air flow or hits the high-speed rotating motor and balance weight to cause the oil droplets to break, making the lubricating oil easier to be taken out of the compressor by the refrigerant gas and enter in the refrigeration system. The lubricating oil stays and accumulates in the inner wall of the pipes of the condenser and evaporator, which increases the thermal resistance of the heat exchanger wall and reduces the heat transfer coefficient; at the same time, because the viscosity of the lubricating oil is much higher than that of the refrigerant, the flow resistance increases, which will make the Increased pressure drop in piping and heat exchangers. On the other hand, if the lubricating oil is discharged into the system from the compressor, the liquid level of the oil pool in the compressor will be reduced, and the oil supply will be reduced, causing the friction pair to wear out or even get stuck and unable to operate, making it difficult to ensure the reliability of the compressor.

When the compressor is running in an unsteady state, such as during cold start, a large amount of refrigerant is liquefied in the oil pool. After the liquid level is higher than the exhaust port of the muffler, it is blown to the upper cavity of the motor by the high-speed airflow from the muffler. In addition, the lubricating oil at the outlet of the upper spiral oil tank is difficult to separate after being broken, and is taken to the upper cavity of the motor and stays there, resulting in a decrease in the amount of lubricating oil in the oil pool, and it is difficult to ensure the viscosity of the oil pool, which affects the cold start reliability of the compressor. Therefore, in order to reduce the oil content in the system, at the same time fully ensure that there is a sufficient amount of lubricating oil between the moving parts in the compressor, and in order to ensure the reliability of the compressor when it starts, it is necessary to effectively separate the lubricating oil and reduce the compression. The oil discharge rate of the machine.

At present, the oil separation device added inside the compressor is mainly a flat plate or flanging device installed above the motor rotor. The separation effect of this device is poor, and it is difficult to separate small oil droplets that have been broken; and the rotation resistance Larger, increasing the power consumption of the compressor; at the same time, it is unavoidable that a large amount of mixture of refrigerant and lubricating oil is blown to the upper chamber of the motor by the high-speed airflow from the muffler during cold start, resulting in reliability problems caused by insufficient viscosity of the oil pool.

Contents of the invention

The object of the present invention is to provide an oil separation device and a rotary compressor that reduce the oil discharge rate, change the airflow direction at the outlet of the muffler, solve the problem of high oil discharge rate caused by oil droplets broken by high-speed airflow, and the cold start process Among them, the problem of insufficient oil pool viscosity caused by insufficient lubricating oil in the oil pool caused by a large amount of refrigerant/lubricating oil mixture being blown into the upper cavity of the motor does not affect the noise reduction effect and increase the power consumption of the compressor.

In order to achieve the above object, the present invention has the following technical solutions:

An oil separation device for reducing the oil discharge rate, including a guide part for changing the airflow direction and a fixing part connected with the muffler, the guide part is composed of two parts, an arc surface and an extended rib, and the arc surface is along the The outer circumference of the muffler exhaust hole extends above the muffler exhaust hole, and the extended rib is connected to the edge of the arc surface; the fixing part is used to connect the arc surface and the extended rib to the The outer surface of the muffler is connected; the airflow discharged from the exhaust hole of the muffler is discharged horizontally through the channel formed by the arc surface and the extended rib.

As a preferred solution of the oil separation device of the present invention, two exhaust holes of the muffler are symmetrically opened on the surface of the muffler, and the arc-shaped surfaces on the exhaust holes of the two mufflers are located opposite to each other.

As a preferred solution of the oil separation device of the present invention, the outlet area of the channel formed by the arc-shaped surface and the extended rib is equal to the area of the exhaust hole of the muffler.

As a preferred solution of the oil separation device of the present invention, the fixing part is an arc-shaped broadside arranged around the outer circumference of the exhaust hole of the muffler, and the width of the arc-shaped broadside is 0.5mm-3mm.

As a preferred solution of the oil separation device of the present invention, the fixing part is fixed on the outer surface of the muffler by welding or gluing.

A single-cylinder rotary compressor includes a compressor housing, an exhaust pipe is arranged on the top of the compressor housing, a motor assembly and a cylinder are arranged inside the compressor housing, and the motor assembly is composed of a motor stator and a motor rotor. The motor rotor is connected with one end of the crankshaft, and one end of the crankshaft is set at the center of the cylinder, and the side of the cylinder is connected with the liquid reservoir through the suction intubation tube, and the oil separation device for reducing the oil discharge rate is installed on the exhaust hole of the muffler of the cylinder .

As a preferred solution of the single-cylinder rotary compressor of the present invention, the upper and lower end faces of the cylinder are provided with bearings, the muffler is arranged on the upper bearing, and the refrigerant output from the liquid accumulator flows into the bottom of the muffler from the side of the cylinder, Then through the exhaust hole of the muffler, it is output through the oil separation device that reduces the oil discharge rate.

A double-cylinder rotary compressor includes a compressor housing, an exhaust pipe is arranged on the top of the compressor housing, a motor assembly and a double-layer cylinder are arranged inside the compressor housing, and the motor assembly is composed of a motor stator and a motor rotor The double-layer cylinder includes an upper cylinder and a lower cylinder, a middle partition is set between the upper cylinder and the lower cylinder, the motor rotor is connected with one end of the crankshaft, and the other end of the crankshaft is arranged in the center of the upper cylinder and the lower cylinder in turn, and the upper cylinder and the lower cylinder are connected. The sides of the lower cylinder are respectively connected to the liquid reservoir through the upper suction intubation and the lower suction intubation, and the oil separation device for reducing the oil discharge rate is installed on the exhaust hole of the muffler of the double-layer cylinder.

As a preferred solution of the double-cylinder rotary compressor of the present invention, the upper end surface of the upper cylinder is provided with an upper bearing, the lower end surface of the lower cylinder is provided with a lower bearing, the muffler is arranged on the upper bearing, and the cooling output from the accumulator The agent flows into the bottom of the muffler from the sides of the upper cylinder and the lower cylinder, and then is output through the exhaust hole of the muffler through the oil separation device that reduces the oil discharge rate.

Compared with the prior art, the oil separation device for reducing the oil discharge rate of the present invention has at least the following beneficial effects:

The oil separation device of the present invention is installed on the exhaust hole of the muffler, and by changing the direction of the high-speed airflow coming out of the exhaust hole of the muffler, during steady-state operation, the lubricating oil coming out of the upper spiral oil tank is prevented from being broken by the high-speed airflow to cause the particle size of the oil droplets to decrease. reduced and difficult to separate. During cold start or other unsteady operation, avoid the refrigerant/lubricating oil mixture that is higher than the upper end of the muffler from being blown into the upper cavity of the motor assembly and stagnating, thereby reducing the amount of lubricating oil in the oil pool and excessively diluting the lubricating oil question. The oil separation device for reducing the oil discharge rate of the present invention can effectively improve the oil separation efficiency, effectively reduce the oil discharge rate, and ensure the reliability of the compressor in an unsteady state without affecting the noise reduction effect and increasing the power consumption of the compressor.

Compared with the prior art, the single-cylinder rotary compressor and the double-cylinder rotary compressor of the present invention have the same beneficial effect because the oil separation device for reducing the oil discharge rate is installed on the exhaust hole of the muffler. This will not be repeated here.

Description of drawings

Fig. 1 is a schematic structural view of a single-cylinder rotary compressor according to an embodiment of the present invention;

Fig. 2 is a schematic structural view of a twin-cylinder rotary compressor according to an embodiment of the present invention;

Fig. 3 is a schematic front view of the oil separation device of the embodiment of the present invention assembled on the muffler;

Fig. 4 is a schematic top view of the oil separation device of the embodiment of the present invention assembled on the muffler;

Fig. 5 is a three-dimensional schematic view of the oil separation device of the embodiment of the present invention assembled on the muffler;

Fig. 6 is a schematic diagram of the oil separation process of the single-cylinder rotary compressor of the embodiment of the present invention;

Fig. 7 is a schematic diagram of the oil separation process of the double-cylinder rotary compressor according to the embodiment of the present invention;

In the drawings: 1. Upper cover; 2. Cylinder; 3. Motor stator; 4. Motor rotor; 5. Balance weight; 6. Crankshaft; 7. Upper bearing; 8. Muffler; 9. Cylinder; 10. Lower bearing ;11. Lower cover; 12. Suction intubation; 13. Liquid reservoir; 14. Exhaust pipe; 15. Upper muffler; 16. Upper cylinder; 17. Middle partition; 18. Oil separation device; 19. Lower Cylinder; 20. Lower muffler; 21. Installation base plate; 22. Lower suction intubation; 23. Upper suction intubation; 24. Muffler exhaust hole; 181. Guide part; 182. Fixed part; ;1812. Extend rib.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in FIG. 1 , the single-cylinder rotary compressor according to the embodiment of the present invention includes a shell assembly, a motor assembly, a pump body assembly, a crankshaft and an oil separator. The casing assembly is composed of an upper cover 1, a cylinder body 2 and a lower cover 11, and the three are welded together to form a rotary compressor casing. The upper cover 1 is connected with an exhaust pipe 14 for discharging high-temperature and high-pressure refrigerant. The motor assembly is composed of a motor stator 3 and a motor rotor 4 to provide power for the rotation of the crankshaft 6 . After the refrigerant is compressed in the cylinder 9, it passes through the muffler exhaust hole 24 on the muffler 8, and the muffler exhaust hole 24 is equipped with an oil separation device 18 of the present invention to reduce the oil discharge rate. Under the action of the oil separator 18, the direction of the airflow is changed, and the oil is discharged into the cylinder 2. Pass through motor subsequently, discharge in the refrigerating system by exhaust pipe 14.

As shown in Fig. 2, the double-cylinder rotary compressor according to the embodiment of the present invention includes a shell assembly, a motor assembly, a pump body assembly, a crankshaft and an oil separator. The casing assembly is composed of an upper cover 1, a cylinder body 2 and a lower cover 14, and the three are welded together to form a rotary compressor casing. The upper cover is connected with an exhaust pipe 14 for discharging high-temperature and high-pressure refrigerant. The motor assembly is composed of a motor stator 3 and a motor rotor 5 to provide power for the rotation of the crankshaft 6 . The double-cylinder rotary compressor includes an upper cylinder 9 and a lower cylinder 11 separated by a middle partition 10 . After the refrigerant is compressed in the upper and lower cylinders, it passes through the exhaust hole 24 of the muffler, and under the action of the oil separator 18, the direction of the airflow is changed and discharged into the cylinder 2 . After passing through the motor, it is discharged into the refrigeration system by the exhaust pipe 20. An installation bottom plate 21 is provided at the bottom of the housing assembly for fixed installation of the rotary compressor.

The assembly structure of the oil separation device according to the embodiment of the present invention is shown in Figure 3 to Figure 5, which is used to change the airflow direction of the compressed refrigerant, thereby improving the oil-gas separation efficiency and ensuring the reliability of the compressor during unsteady operation. The oil separator 18 in this example includes a guide part 181 for changing the direction of the airflow and a fixing part 182 connected with the upper muffler 15 . Wherein, the guide portion 181 is composed of two parts, namely an arc-shaped surface 1811 and an extension rib 1812, wherein the arc-shaped surface 1811 extends above the muffler exhaust hole 24 along the outer circumference of the muffler exhaust hole 24, and the extension rib 1812 connects with the edge of the arc surface 1811 . The arc surface 1811 is a quarter sphere or an ellipsoid, and the extension rib 1812 is a half cylinder or an ellipse cylinder. The arc surface 1811 adopts a quarter sphere or an ellipsoid to reduce airflow resistance. The outlet formed by the extended rib 1812 is semi-circular or semi-elliptical, and the area of the outlet is the same as that of the exhaust hole of the muffler. The extended length of the extended rib 1812 is as long as possible to ensure that the airflow flows along the guiding direction as much as possible. The fixed portion 182 is extended outward from the contact surface between the guide portion 181 and the upper end surface of the muffler. The width of the fixed portion 182 is 0.5-3 mm, mainly depending on the position of the muffler exhaust hole 24 of the muffler 8 . Both the guide part 181 and the fixing part 182 are integral, and the fixing part 182 is installed on the upper end surface of the upper muffler by welding or gluing.

The oil separation process of the single-cylinder rotary compressor using the above-mentioned oil separation device is shown in Figure 6:

Under the action of the oil stirring plate of the compressor, the lubricating oil is sucked up from the central oil hole of the crankshaft 6, through the radial oil hole, part of it flows to the upper and lower end faces of the cylinder 9, the piston and the eccentric bearing, the piston and the cylinder wall and other gaps seal; another part of lubricating oil flows through the upper spiral oil groove and flows out obliquely upwards. The refrigerant enters the cylinder 9 through the suction intubation pipe 12, and after being compressed, the compressed refrigerant of the cylinder 9 reaches the muffler 8 through the exhaust valve. Under the guidance of the oil separator 18, the flow direction of the refrigerant can be changed, thereby preventing the lubricating oil from being broken under the action of the high-speed airflow.

The oil separation process of the twin-cylinder rotary compressor using the above-mentioned oil separation device is shown in Figure 7:

Under the action of the oil stirring plate of the compressor, the lubricating oil is sucked up from the central oil hole of the crankshaft 6, through the radial oil hole, part of it flows to the upper and lower end surfaces of the upper cylinder 16 and the lower cylinder 19, the piston and the eccentric bearing, and the piston and the The gaps in the cylinder wall and other places are sealed; another part of lubricating oil flows through the upper spiral oil groove and flows out obliquely upward. The refrigerant enters the cylinder through the suction intubation, and after being compressed, the refrigerant compressed by the upper cylinder 16 reaches the upper muffler 15 through the exhaust valve; The through holes of plate 17, upper cylinder 16 and upper bearing 7 reach the upper muffler 15. Under the guiding action of the oil separator 18, the flow direction of the refrigerant is changed to prevent the lubricating oil from being broken under the action of the high-speed airflow.

A rotary compressor proposed by the present invention adopts the above-mentioned oil separation device 18 . Due to the installation of the above-mentioned oil separation device, changing the direction of the refrigerant air flow, the oil-gas separation efficiency is improved, and the oil discharge rate is lower; during unsteady operation such as cold start, the amount of lubricating oil in the oil pool can be guaranteed, thereby ensuring refrigeration in the oil pool agent/lubricant mix viscosity and compressor reliability. The oil separation device is installed on the upper end surface of the muffler without contact with moving parts, which will not affect the muffler effect and increase the power consumption of the compressor.

The present invention is not limited to the specific implementations listed above, and those skilled in the art can make various equivalent modifications, replacements, additions and deletions of components and recombinations according to the principles of the present invention and the specific implementations given above. , such as changing the structure of the guide part, the position and structure of the fixing part, etc., so as to form more new embodiments.

Claims (7)

1. An oil separation device for reducing the oil discharge rate, characterized in that it comprises a guide part (181) for changing the airflow direction and a fixing part (182) connected with the muffler, and the guide part (181) is composed of an arc The surface (1811) and the extension rib (1812) are composed of two parts. The arc surface (1811) is extended along the outer circumference of the muffler exhaust hole (24) to the upper side of the muffler exhaust hole (24). The edge (1812) is connected to the edge of the arc surface (1811); the fixing part (182) is used to connect the arc surface (1811) and the extended rib (1812) to the outer surface of the muffler The airflow discharged by the muffler exhaust hole (24) is discharged horizontally through the channel formed by the arc surface (1811) and the extended rib (1812); the muffler exhaust hole (24) is symmetrically provided with two , the arc-shaped surfaces (1811) on the two muffler exhaust holes (24) are located opposite; the passage outlet area formed by the arc-shaped surfaces (1811) and the extended rib (1812) is the same as that of the muffler exhaust holes (24 ) are equal in area. 2. The oil separation device for reducing the oil discharge rate according to claim 1, characterized in that, the fixed part (182) is an arc-shaped broadside arranged around the outer circumference of the muffler exhaust hole (24), and the arc-shaped The width of the wide side is 0.5mm-3mm. 3. The oil separation device for reducing oil discharge rate according to claim 1, characterized in that, the fixing part (182) is fixed on the outer surface of the muffler by welding or gluing. 4. A single-cylinder rotary compressor is characterized in that it comprises a compressor housing, the top of the compressor housing is provided with an exhaust pipe (14), and the inside of the compressor housing is provided with a motor assembly and a cylinder (9 ), the motor assembly is made up of a motor stator (3) and a motor rotor (4), the motor rotor (4) is connected with one end of the crankshaft (6), and one end of the crankshaft (6) is arranged at the center of the cylinder (9), and the cylinder (9 ) side is connected with the liquid reservoir (13) by the suction intubation (12), and on the muffler exhaust hole (24) of the cylinder (9), the oil discharge rate reduction device described in any one of claims 1 to 3 is installed. oil separator. 5. The single-cylinder rotary compressor according to claim 4, characterized in that, the upper and lower end surfaces of the cylinder (9) are provided with bearings, the muffler (8) is arranged on the upper bearing (7), and the storage The refrigerant output from the liquid tank (13) flows into the bottom of the muffler (8) from the side of the cylinder (9), and then passes through the muffler exhaust hole (24) and is output through the oil separation device that reduces the oil discharge rate. 6. A double-cylinder rotary compressor, characterized in that it comprises a compressor housing, the top of the compressor housing is provided with an exhaust pipe (14), and the inside of the compressor housing is provided with a motor assembly and a double-layer cylinder , the motor assembly is composed of a motor stator (3) and a motor rotor (4), the double-layer cylinder includes an upper cylinder (16) and a lower cylinder (19), and an intermediate partition is set between the upper cylinder (16) and the lower cylinder (19) (17), the motor rotor (4) is connected to one end of the crankshaft (6), and the other end of the crankshaft (6) is arranged on the center of the upper cylinder (16) and the lower cylinder (19) successively, and the upper cylinder (16) and the lower cylinder The side of (19) links to each other with liquid reservoir (13) by last suction intubation (23) and following suction intubation (22) respectively, on the muffler exhaust hole (24) of double-deck cylinder, be installed with as claimed in claim 1 The oil separation device for reducing the oil discharge rate described in any one of 3 to 3. 7. The two-cylinder rotary compressor according to claim 6, characterized in that, the upper end surface of the upper cylinder (16) is provided with an upper bearing (7), and the lower end surface of the lower cylinder (19) is provided with a lower bearing (10), the muffler (8) is arranged on the upper bearing (7), and the refrigerant output from the liquid accumulator (13) flows into the bottom of the muffler (8) from the sides of the upper cylinder (16) and the lower cylinder (19), and then passes through the The exhaust hole (24) of the muffler is output through an oil separation device that reduces the oil discharge rate.

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