Oil separator, air conditioning system

Abstract

The present invention provides an oil separator and an air conditioning system, wherein the oil separator includes a shell, an exhaust port is provided at the top of the shell, a first airflow guide is provided in the shell, the first airflow guide includes a first cylinder wall and a second cylinder wall coaxially arranged with each other, the first cylinder wall is located radially outside the second cylinder wall, and the first end of the first cylinder wall is connected to the first end of the second cylinder wall through a first ring plate, the second end of the second cylinder wall is connected to the side wall of the shell through a second ring plate, an annular gap is formed between the second end of the first cylinder wall and the second ring plate, and a first air inlet is provided at the shell corresponding to the annular gap. According to the present invention, the first airflow guide can greatly increase the length of the refrigerant flow path in the first air inlet, so that the refrigerant in the first air inlet can flow along the first airflow guide and form oil separation and precipitation due to contact with the wall of the first airflow guide during the flow process, thereby effectively improving the oil separation effect of the oil separator.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning, and in particular relates to an oil separator and an air conditioning system. Background Art

[0002] In the oil circuit system of the series heat pump water-cooled centrifuge, due to the gaps between the various mechanisms, the refrigerant oil will flow into the cooling system and eventually accumulate in the evaporator; secondly, Figure 1 As shown, since the oil tank needs to pass refrigerant to cool the refrigeration oil, the liquid refrigerant evaporates when heated, and the gaseous refrigerant in the oil tank will take away the fine oil droplets above the liquid surface and return to the compressor suction port through the oil tank balance pipe. The compressor compresses it and returns to the condenser through the exhaust pipe, and then throttles it from the bottom of the condenser into a mixture of liquid and oil through the throttling device and returns to the evaporator, and the refrigeration oil finally accumulates in the evaporator. In addition, in the cooling of the compressor motor, the evaporated refrigerant will also take away the fine oil droplets and return to the evaporator through the motor return air, so that the refrigeration oil accumulated in the evaporator is increasing, while the oil in the oil system is decreasing, which easily leads to the compressor bearing being not lubricated properly and causing bearing damage. In the prior art, in order to overcome the above-mentioned shortcomings, an oil separator is set in the motor return air pipeline and the oil tank balance pipeline to separate and recycle the mixture of refrigerant and oil droplets in the motor return air and the oil tank balance, but the separation effect is not very ideal. Summary of the invention

[0003] Therefore, the present invention provides an oil separator and an air conditioning system to solve the technical problem that the oil separator in the prior art has a poor separation effect between refrigerant and oil droplets.

[0004] In order to solve the above problems, the present invention provides an oil separator, including a shell, a top of the shell is provided with an exhaust port, a first airflow guide is provided in the shell, the first airflow guide includes a first cylinder wall and a second cylinder wall which are coaxially arranged with each other, the first cylinder wall is located radially outside the second cylinder wall, and the first end of the first cylinder wall is connected to the first end of the second cylinder wall by a first ring plate, the second end of the second cylinder wall is connected to the side wall of the shell by a second ring plate, an annular gap is formed between the second end of the first cylinder wall and the second ring plate, and a first air inlet is provided at the shell corresponding to the annular gap.

[0005] Preferably, a plurality of first oil drop holes are provided on the second ring plate.

[0006] Preferably, a central tube is provided on a side of the exhaust port facing the interior of the shell, and the central tube extends toward the bottom wall of the shell.

[0007] Preferably, a second airflow guide is provided between the outer tube wall of the central tube and the side wall of the shell, and the second airflow guide includes a conical wall and a third ring plate, the top of the conical wall is connected to the central tube, the bottom of the conical wall is connected to the inner diameter side of the third ring plate, the outer diameter side of the third ring plate is connected to the side wall, and the third ring plate is configured with a plurality of second oil drop holes.

[0008] Preferably, there is an inclined angle A between the conical wall and the center line of the central tube, 25°≤A≤45°; and / or, a plurality of second airflow guides are arranged along the axial direction of the central tube, and the plurality of second airflow guides are arranged at intervals.

[0009] Preferably, an oil drain port is configured at the bottom of the shell, and an oil baffle is provided between the air inlet of the central tube and the oil drain port.

[0010] Preferably, a filter plate is provided between the conical wall and the side wall.

[0011] Preferably, there is also a second air inlet, which is arranged at the housing corresponding to the annular gap.

[0012] The present invention also provides an air-conditioning system, including a compressor, a condenser, a throttling device, and an evaporator. The compressor, condenser, throttling device, and evaporator are connected in sequence to form a refrigerant circulation, and also include an oil tank and an oil separator. The oil separator is provided at the intake pipe of the compressor to separate the oil from the refrigerant in the oil tank balance pipe of the oil tank, and the oil discharge port of the oil separator is connected to the oil tank.

[0013] Preferably, the air-conditioning system also includes a first ejector, the first ejector having a first ejection port, a second ejection port, and a third ejection port, the oil tank balance pipe of the oil tank is connected to the second ejection port, the oil tank cooling pipe of the oil tank is connected to the condenser, the exhaust pipe of the compressor is connected to the first ejection port, the first air inlet of the oil separator is connected to the third ejection port, and the exhaust port of the oil separator is connected to the intake pipe of the compressor.

[0014] Preferably, the compressor has a motor and also includes a motor cooling pipeline, which includes a motor cooling pipe for introducing part of the refrigerant of the condenser into the motor part and a motor return pipe for leading the refrigerant after heat exchange with the motor out of the motor part.

[0015] Preferably, the air-conditioning system also includes a second ejector, the second ejector having a fourth ejection port, a fifth ejection port, and a sixth ejection port, the fifth ejection port being connected to the motor return air pipe, the fourth ejection port being connected to the exhaust pipe of the compressor, and the sixth ejection port being connected to the second air inlet of the oil separator.

[0016] Preferably, the air-conditioning system also includes a third ejector, the third ejector having a seventh ejection port, an eighth ejection port, and a ninth ejection port, the seventh ejection port being connected to the exhaust pipe of the compressor, the eighth ejection port being connected to the exhaust port of the oil separator, and the ninth ejection port being connected to the intake pipe of the compressor.

[0017] The present invention provides an oil separator and an air-conditioning system, wherein a first air flow guide having a 5-shaped appearance structure can greatly increase the length of the refrigerant flow path in the first air inlet, so that the refrigerant in the first air inlet can flow along the first air flow guide and during the flow process, the refrigerant is separated and precipitated due to contact with the wall of the first air flow guide, thereby effectively improving the oil separation effect of the oil separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the principle of an air conditioning system in the prior art;

[0019] Figure 2 A schematic diagram of the principle of an air conditioning system according to an embodiment of the present invention;

[0020] Figure 3 Based Figure 1 Schematic diagram of the internal structure of the oil separator.

[0021] The reference numerals are:

[0022] 1. compressor; 11. air intake pipe; 12. air exhaust pipe; 2. condenser; 3. throttling device; 4. evaporator; 5. oil tank; 51. oil tank balance pipe; 52. oil tank cooling pipe; 6. oil separator; 61. first air inlet; 62. air outlet; 63. oil outlet; 64. second air inlet; 71. first ejector; 72. second ejector; 73. third ejector; 81. motor cooling pipe; 82. motor return pipe; 601. shell; 602. first air flow guide; 6021. first cylinder wall; 6022. second cylinder wall; 6023. first ring plate; 6024. second ring plate; 603. center tube; 604. second air flow guide; 6041. cone wall; 6042. third ring plate; 605. oil baffle plate; 606. filter plate. DETAILED DESCRIPTION

[0023] See also Figures 1 to 3As shown, according to an embodiment of the present invention, an air-conditioning system is provided, comprising a compressor 1, a condenser 2, a throttling device 3, and an evaporator 4, wherein the compressor 1, the condenser 2, the throttling device 3, and the evaporator 4 are connected in sequence to form a refrigerant cycle, and further comprising an oil tank 5, an oil separator 6, and a first ejector 71, wherein the first ejector 71 has a first ejection port, a second ejection port, and a third ejection port, an oil tank balancing pipe 51 of the oil tank 5 is connected to the second ejection port, an oil tank cooling pipe 52 of the oil tank 5 is connected to the condenser 2, an exhaust pipe 12 of the compressor 1 is connected to the first ejection port, a first air inlet 61 of the oil separator 6 is connected to the third ejection port, and an exhaust port 62 of the oil separator 6 is connected to an intake pipe 11 of the compressor 1. In this technical solution, the refrigerant refluxed into the oil tank 5 quickly enters the oil separator 6 under the injection action of the high-pressure refrigerant introduced from the first injection port, thereby improving the separation efficiency of the refrigerant and oil in the oil separator 6, and further improving the oil separation effect of the oil separator 6. It can be understood that a better oil separation effect can reduce the oil content of the refrigerant in the air-conditioning system, effectively prevent the large amount of oil from gathering in the evaporator 4, and improve the evaporation efficiency of the evaporator 4.

[0024] Preferably, the oil discharge port 63 of the oil separator 6 is connected to the oil tank 5, that is, the oil separated by the oil separator 6 (also called lubricating oil or refrigeration oil) is promptly guided back to the oil tank 5, thereby ensuring the stability of the oil amount in the air-conditioning system, and enabling the movable joints in the compressor 1, such as the bearings, to be fully lubricated, thereby ensuring its reliable stability.

[0025] The compressor 1 has a motor inside, and further, the air conditioning system also includes a motor cooling pipeline, which includes a motor cooling pipe 81 for introducing part of the refrigerant of the condenser 2 into the motor part and a motor return pipe 82 for leading the refrigerant after heat exchange with the motor out of the motor part, so as to be able to guide part of the refrigerant in the condenser 2 to the motor to effectively cool the motor. At this time, correspondingly, the air conditioning system is also provided with a second ejector 72, the second ejector 72 has a fourth ejector port, a fifth ejector port, and a sixth ejector port, the fifth ejector port is connected to the motor return pipe 82, the fourth ejector port is connected to the exhaust pipe 12 of the compressor 1, and the sixth ejector port is connected to the second air inlet 64 of the oil separator 6. In this technical solution, the high-pressure refrigerant of the exhaust pipe of the compressor 1 forms an ejection effect on the refrigerant in the motor return pipe 82, thereby effectively separating the oil in the refrigerant in the motor return pipe 82.

[0026] In some embodiments, the air conditioning system further includes a third ejector 73, the third ejector 73 having a seventh ejection port, an eighth ejection port, and a ninth ejection port, the seventh ejection port being connected to the exhaust pipe 12 of the compressor 1, the eighth ejection port being connected to the exhaust port 62 of the oil separator 6, and the ninth ejection port being connected to the intake pipe 11 of the compressor 1. In this technical solution, the high-pressure refrigerant passing through the exhaust pipe of the compressor 1 can eject the gaseous refrigerant after oil separation in the exhaust port 62 of the oil separator 6 into the intake pipe 11 of the compressor 1, so that the intake of the compressor 1 is smoother.

[0027] As a specific embodiment of the oil separator 6, preferably, the oil separator 6 includes a shell 601, the top of the shell 601 is provided with the exhaust port 62, the shell 601 is provided with a first airflow guide 602, the first airflow guide 602 includes a first cylinder wall 6021 and a second cylinder wall 6022 coaxially arranged with each other, the first cylinder wall 6021 is located at the radial outer side of the second cylinder wall 6022, and the first end of the first cylinder wall 6021 and the first end of the second cylinder wall 6022 are connected through a first ring plate 6023, the second end of the second cylinder wall 6022 is connected to the side wall of the shell 601 through a second ring plate 6024, and an annular gap is formed between the second end of the first cylinder wall 6021 and the second ring plate 6024, so that the first airflow guide 602 is on the axial section of the shell 601 (such as Figure 3 The first air inlet 61 is arranged at the shell 601 corresponding to the annular gap. In this technical solution, the first air flow guide 602 with a 5-shaped appearance structure can greatly increase the length of the refrigerant flow path in the first air inlet 61, so that the refrigerant in the first air inlet 61 can flow along the first air flow guide 602 and form oil separation and precipitation due to contact with the wall of the first air flow guide 602 during the flow process, thereby effectively improving the oil separation effect of the oil separator 6. Preferably, a plurality of first oil drop holes (not shown in the figure) are provided on the second ring plate 6024, so that the oil (oil droplets) separated and precipitated on the first cylinder wall 6021, the second cylinder wall 6022, and the first ring plate 6023 can quickly accumulate at the bottom of the oil separator 6 and flow back to the oil tank 5 through the oil discharge port 63.

[0028] In some embodiments, a central tube 603 is provided on one side of the exhaust port 62 facing the inside of the shell 601, and the central tube 603 extends toward the bottom wall of the shell 601. The provision of the central tube 603 can set the actual outlet position of the refrigerant close to the bottom area of ​​the shell 601, thereby further increasing the flow path length of the refrigerant in the oil separator 6, which can further improve the oil separation effect of the oil separator 6.

[0029] Furthermore, a second airflow guide 604 is provided between the outer tube wall of the central tube 603 and the side wall of the shell 601, and the second airflow guide 604 includes a conical wall 6041 and a third ring plate 6042. The top of the conical wall 6041 is connected to the central tube 603, the bottom of the conical wall 6041 is connected to the inner diameter side of the third ring plate 6042, the outer diameter side of the third ring plate 6042 is connected to the side wall, and the third ring plate 6042 is constructed with a plurality of second oil drop holes (not shown in the figure). In this technical solution, the second air flow guide 604 is arranged on the air flow discharge path of the first air flow guide 602, and a refrigerant flow channel is formed between the second cylinder wall 6022 and the center tube 603, in which the refrigerant can further separate the oil on the conical wall 6041, and the separated oil can flow along the inclined surface of the conical wall 6041 to the third ring plate 6042 and accumulate at the bottom of the shell 601 through the second oil drop hole. Preferably, there is an inclined angle A between the conical wall 6041 and the center line of the central tube 603, 25°≤A≤45°, preferably A=30°, to ensure that the conical wall 6041 has a good oil guiding effect and can make its contact surface with the refrigerant flow as large as possible to ensure the oil separation effect; a plurality of second airflow guides 604 are arranged along the axial direction of the central tube 603, and a plurality of second airflow guides 604 are arranged at intervals, objectively forming a double-layer, three-layer or multi-layer structure, and the interlayer gaps between two adjacent layers of the second airflow guides 604 form a small space that can make the oil droplets slide down faster. It should be particularly pointed out that the second air flow guide 604 in the present invention can further guide the refrigerant airflow flowing out of the first air flow guide 602 of the shell 601 to the side wall of the shell 601, and form an oil isolation area near the air inlet of the central tube 603, which is conducive to preventing the refrigerant gas from entraining the separated oil droplets and discharging them again at the air inlet of the central tube 603, thereby ensuring the oil separation effect of the oil separator 6.

[0030] In some embodiments, an oil baffle plate 605 is provided between the air inlet of the central tube 603 and the oil discharge port 63. The oil baffle plate 605 is provided with a plurality of through holes. The oil baffle plate 605 is disposed above the bottom oil collecting liquid level of the shell 601 to prevent the oil droplets separated from the second airflow guide 604 above it from directly falling on the liquid surface below, which may cause oil splashing, thereby preventing the gaseous refrigerant from entraining the splashed oil into the central tube 603 again for discharge.

[0031] When the oil separator 6 has a second air inlet 64, the second air inlet 64 is arranged at the housing 601 corresponding to the annular gap. It can be understood that the first air inlet 61 and the second air inlet 64 can be implemented by the same air inlet.

[0032] Preferably, a filter plate 606 is provided between the conical wall 6041 and the side wall, and the filter plate 606 is preferably provided in multiple layers, and the multiple layers of the filter plates 606 are arranged at intervals along the axial direction of the housing 601 to further separate the oil from the refrigerant airflow. Specifically, the filter plate 606 can be a circular thin sheet metal with dense and fine mesh holes distributed on the sheet metal surface.

[0033] The first airflow guide 602 and the second airflow guide 604 may also be made of sheet metal.

[0034] The first ejector 71, the second ejector 72 and the third ejector 73 can be selected according to the actual pipeline design and flow requirements.

[0035] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that: The invention comprises a compressor (1), a condenser (2), a throttling device (3), and an evaporator (4), wherein the compressor (1), the condenser (2), the throttling device (3), and the evaporator (4) are connected in sequence to form a refrigerant cycle, and further comprises an oil tank (5) and an oil separator (6), wherein the compressor (1) has an air intake pipe (11) provided with the oil separator (6) to separate the oil from the refrigerant in the oil tank balance pipe (51) of the oil tank (5), and an oil discharge port (63) of the oil separator (6) is connected to the oil tank (5); and further comprises a first ejector (71), wherein the first ejector The injector (71) has a first injection port, a second injection port, and a third injection port; the oil tank balance pipe (51) of the oil tank (5) is in communication with the second injection port; the oil tank cooling pipe (52) of the oil tank (5) is in communication with the condenser (2); the exhaust pipe (12) of the compressor (1) is in communication with the first injection port; the first air inlet (61) of the oil separator (6) is in communication with the third injection port; the exhaust port (62) of the oil separator (6) is in communication with the intake pipe (11) of the compressor (1); and the compressor (1) has a The motor also includes a motor cooling pipeline, the motor cooling pipeline including a motor cooling pipe (81) for introducing part of the refrigerant of the condenser (2) into the motor and a motor return pipe (82) for leading the refrigerant after heat exchange with the motor out of the motor; and also includes a second ejector (72), the second ejector (72) having a fourth ejection port, a fifth ejection port, and a sixth ejection port, the fifth ejection port being in communication with the motor return pipe (82), the fourth ejection port being in communication with the exhaust pipe (12) of the compressor (1), and the sixth ejection port being in communication with the oil separator (6). The oil separator (6) comprises a shell (601), the top of the shell (601) is provided with an exhaust port (62), a central tube (603) is provided on the side of the exhaust port (62) facing the inside of the shell (601), and the central tube (603) extends towards the bottom wall of the shell (601); the bottom of the shell (601) is configured with an oil discharge port (63), an oil baffle plate (605) is provided between the air inlet of the central tube (603) and the oil discharge port (63), and a plurality of through holes are provided on the oil baffle plate (605).

2. The air conditioning system according to claim 1, characterized in that: The invention also comprises a third ejector (73), the third ejector (73) having a seventh ejection port, an eighth ejection port, and a ninth ejection port, the seventh ejection port being connected to an exhaust pipe (12) of the compressor (1), the eighth ejection port being connected to an exhaust port (62) of the oil separator (6), and the ninth ejection port being connected to an intake pipe (11) of the compressor (1).

3. The air conditioning system according to claim 1, characterized in that: A first airflow guide (602) is provided in the shell (601), and the first airflow guide (602) comprises a first cylinder wall (6021) and a second cylinder wall (6022) which are coaxially arranged with each other, the first cylinder wall (6021) being located radially outside the second cylinder wall (6022), and the first end of the first cylinder wall (6021) and the first end of the second cylinder wall (6022) are connected via a first ring plate (6023), the second end of the second cylinder wall (6022) is connected to the side wall of the shell (601) via a second ring plate (6024), an annular gap is formed between the second end of the first cylinder wall (6021) and the second ring plate (6024), and a first air inlet (61) is provided at the shell (601) corresponding to the annular gap.

4. The air conditioning system according to claim 3, characterized in that: The second ring plate (6024) is provided with a plurality of first oil drop holes.

5. The air conditioning system according to claim 1, characterized in that: A second airflow guide (604) is provided between the outer tube wall of the central tube (603) and the side wall of the shell (601), and the second airflow guide (604) comprises a conical wall (6041) and a third ring plate (6042), the top of the conical wall (6041) is connected to the central tube (603), the bottom of the conical wall (6041) is connected to the inner diameter side of the third ring plate (6042), the outer diameter side of the third ring plate (6042) is connected to the side wall, and a plurality of second oil drop holes are constructed on the third ring plate (6042).

6. The air conditioning system according to claim 5, characterized in that: An inclined angle A is formed between the conical wall (6041) and the center line of the central tube (603), 25°≤A≤45°; and / or a plurality of second airflow guides (604) are arranged along the axial direction of the central tube (603), and the plurality of second airflow guides (604) are arranged at intervals.

7. The air conditioning system according to claim 5, characterized in that: A filter plate (606) is provided between the conical wall (6041) and the side wall.

8. The air conditioning system according to claim 3, characterized in that: It also has a second air inlet (64), which is arranged at the housing (601) corresponding to the annular gap.

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