Oil separator, air conditioning system and control method thereof

Abstract

This invention provides an oil separator, an air conditioning system, and a control method thereof. The oil separator includes a housing (27) with an inlet pipe (31), an oil return pipe (32), and an outlet pipe (33) connected to it. A pressure pulsation adaptive device is installed inside the housing (27) along the airflow path from the inlet pipe (31) to the outlet pipe (33). The pressure pulsation adaptive device provides damping force to the airflow to reduce the transmission of pressure pulsation from the side of the inlet pipe (31) to the side of the outlet pipe (33). According to the oil separator of this invention, the path of pressure pulsation transmission to the indoor unit can be suppressed or cut off, reducing the generation of transmitted noise.

Description

Technical Field

[0001] This invention relates to the field of air conditioning system technology, and more specifically, to an oil separator, an air conditioning system, and a control method thereof. Background Technology

[0002] The common structure of a variable displacement compressor generally includes a main cylinder and a variable displacement cylinder. The variable displacement cylinder can selectively work or not work, thereby changing the working displacement to adapt to different load requirements of the refrigeration system and achieve energy saving.

[0003] Existing variable displacement cylinder technology employs a so-called pin-slider switching method: the slide, cylinder, and bearings and partitions covering both ends of the cylinder form a sealed cavity at the tail of the slide. This sealed cavity can selectively introduce high-pressure / low-pressure airflow. A pin locking / unlocking device is provided on the lower end face of the slide. This device consists of a pin hole, a pin, a spring, etc. The head of the pin communicates with the sealed cavity, and the tail of the pin introduces low pressure through a low-pressure channel. Furthermore, a physical device (such as a spring or magnet) gives the pin a pre-action force that moves it toward the slide.

[0004] The drawback of the above method is that when the variable displacement cylinder is working, the high-speed reciprocating motion of the vane causes changes in the volume of the vane tail cavity, generating pressure pulsations, which are transmitted through the high-pressure pipe. In an air conditioning system, when the dual cylinder is working under high load and the cooling mode is turned on, the pressure pulsations are attenuated by the outdoor unit and the throttling device, and there is no sound transmission in the indoor unit. However, in an air conditioning system, when the dual cylinder is working under high load and the heating mode is turned on, the pressure pulsations generated in the sealing cavity of the vane tail of the compressor's variable displacement cylinder are directly transmitted to the indoor unit after passing through the four-way valve, generating a more serious low-frequency sound transmission, which affects the user experience. Summary of the Invention

[0005] The main objective of this invention is to provide an oil separator, an air conditioning system and a control method thereof, which can suppress or cut off the path of pressure pulsation transmitted to the indoor unit and reduce the generation of transmitted noise.

[0006] To achieve the above objectives, according to one aspect of the present invention, an oil separator is provided, comprising a housing, an inlet pipe, an oil return pipe and an outlet pipe connected to the housing, and a pressure pulsation adaptive device disposed inside the housing. The pressure pulsation adaptive device is disposed on the airflow path from the inlet pipe to the outlet pipe, and the pressure pulsation adaptive device is capable of providing damping force to the airflow to reduce the transmission of pressure pulsation from the side where the inlet pipe is located to the side where the outlet pipe is located.

[0007] Furthermore, the pressure pulsation adaptive device includes a first fixed partition and a damping base arranged sequentially at intervals along the airflow direction. The first fixed partition is fixedly disposed relative to the housing. A first damping hole is formed on the first fixed partition, connecting the spaces on both sides of the first fixed partition. A connecting hole is formed on the damping base, connecting the spaces on both sides of the damping base. A first damping block is disposed on the side of the damping base facing the first fixed partition. The cross-sectional area of ​​the first damping block gradually decreases along the direction close to the first damping hole. The first damping block is offset from the connecting hole and is disposed corresponding to the first damping hole. The damping base can be movably disposed relative to the first fixed partition. A damping structure is disposed on the damping base. The damping structure can provide a damping force to the damping base to reduce the flow area of ​​the first damping hole. The damping force is positively correlated with the pressure pulsation.

[0008] Furthermore, the pressure pulsation adaptive device also includes a second fixed partition plate fixedly disposed relative to the housing. The second fixed partition plate is disposed on the downstream side of the airflow of the damping base. A second damping hole is provided on the second fixed partition plate to connect the two sides of the space of the second fixed partition plate. The damping structure is connected between the damping base and the first fixed partition plate.

[0009] Furthermore, a second damping block is provided on the side of the damping base facing the second fixed partition. The cross-sectional area of ​​the second damping block gradually decreases along the direction close to the second damping hole, and the second damping block is misaligned with the connecting hole.

[0010] Furthermore, there are multiple first damping holes, which are evenly spaced along the circumference. There are also multiple second damping holes, one of which is located at the center of the second fixed partition, while the other second damping holes are evenly spaced along the circumference. The first and second damping holes are staggered along both the circumference and the radial direction.

[0011] Furthermore, the centers of the plurality of first damping holes are located on the first circumference, and the centers of the plurality of second damping holes, which are evenly spaced along the circumference, are located on the second circumference. The diameter of the first circumference is smaller than the diameter of the second circumference.

[0012] Furthermore, both the first damping block and the second damping block are frustums of cones, and the angle between the generatrix of the frustum and the central axis is φ, where 0 < φ < 90°.

[0013] Furthermore, the oil separator also includes a flow divider plate, which is disposed between the pressure pulsation adaptive device and the intake pipe to divide the airflow flowing from the intake pipe to the pressure pulsation adaptive device; and / or, the oil separator also includes a third fixed baffle plate, which is provided with vent holes and an upper convex arc plate in the middle of the third fixed baffle plate, and the air inlet of the outlet pipe is provided corresponding to the upper convex arc plate.

[0014] According to another aspect of the present invention, an air conditioning system is provided, including an oil separator, which is the oil separator described above.

[0015] Furthermore, the air conditioning system also includes a variable capacity compressor and a variable capacity tank. The variable capacity tank can be selectively connected to a high-pressure line or a low-pressure line. The high-pressure line and the exhaust port of the variable capacity compressor are connected to the intake pipe of the oil separator. A high-pressure control valve is installed on the high-pressure line.

[0016] According to another aspect of the present invention, a control method for the above-described air conditioning system is provided, characterized in that it includes:

[0017] Select the operating mode of the air conditioning system;

[0018] When the air conditioning system is in dual-cylinder mode and in heating mode;

[0019] Obtain the operating frequency of the variable displacement compressor;

[0020] Obtain the pressure difference between the internal pressure of the variable displacement tank and the suction pressure of the variable displacement compressor;

[0021] When the operating frequency is higher than aHz and the pressure difference is greater than bMpa, the high-pressure control valve is closed and held for time t1, then the high-pressure control valve is opened for time t2, and then the cycle of closing for time t1 is repeated.

[0022] Furthermore, the steps for controlling the operating mode of the air conditioning system include:

[0023] Detect the load status of the variable displacement compressor;

[0024] When under low load, activate single-cylinder mode. In cooling or heating mode, control the low-pressure control valve to open and control the high-pressure control valve to close.

[0025] When under medium or high load, the dual-cylinder mode is activated. In cooling or heating mode, the high-pressure control valve is opened and the low-pressure control valve is closed.

[0026] Furthermore, when under medium to high load, the steps to activate the dual-cylinder mode include:

[0027] Control the single-cylinder start-up of the variable displacement compressor and establish a switching pressure differential;

[0028] When the switching pressure difference is greater than cMPa, the compressor will be switched from single-cylinder operation mode to dual-cylinder operation mode.

[0029] According to the technical solution of this invention, the oil separator includes a housing, on which an inlet pipe, an oil return pipe, and an outlet pipe are connected. A pressure pulsation adaptive device is installed inside the housing, positioned along the airflow path from the inlet pipe to the outlet pipe. This device provides damping force to the flowing air, reducing the transmission of pressure pulsations from the inlet pipe side to the outlet pipe side. By adding a pressure pulsation adaptive device within the housing, the oil separator can provide damping force to the flowing air, reducing the transmission of pressure pulsations from the inlet pipe side to the outlet pipe side. Therefore, it can automatically adjust the airflow damping force according to pressure pulsations, thereby suppressing the transmission of pressure pulsations within the oil separator. This reduces the time and length of the transmission path of pressure pulsations to the indoor unit, effectively cutting off pressure pulsations generated at the tail of the variable-capacity sliding vane in the system transmission path, reducing transmission to the indoor unit, optimizing the airflow path, and improving noise levels. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0031] Figure 1 A schematic diagram of the structure of an air conditioning system of the relevant technology is shown;

[0032] Figure 2 A schematic diagram of the sliding vane tail structure of a variable-capacity compressor of the related technology is shown;

[0033] Figure 3 A schematic cross-sectional view of the tail section of a variable displacement compressor vane in the related technology is shown.

[0034] Figure 4 A schematic diagram of the structure of an air conditioning system according to an embodiment of the present invention is shown;

[0035] Figure 5 A schematic diagram of the internal structure of an oil separator according to an embodiment of the present invention is shown;

[0036] Figure 6 A schematic diagram of the damping base of the oil separator according to an embodiment of the present invention is shown;

[0037] Figure 7 A top view of the damping base of an oil separator according to an embodiment of the present invention is shown;

[0038] Figure 8 A bottom view of the damping base of an oil separator according to an embodiment of the present invention is shown;

[0039] Figure 9 A flowchart of a control method for an air conditioning system according to an embodiment of the present invention is shown; and

[0040] Figure 10 The diagram shows a comparison of pressure pulsation in heating modes under medium and high loads between the air conditioning system of this invention and the air conditioning system of the prior art.

[0041] The above figures include the following reference numerals:

[0042] 1. Exhaust pipe; 2. Intake pipe; 3. Low-pressure signal controller; 4. Low-pressure control valve; 5. Gas-liquid separator; 6. Outdoor heat exchanger; 7. Throttling component; 8. Indoor heat exchanger; 9. Four-way valve; 10. Exhaust pressure pulsation sensor; 11. High-pressure control valve; 12. High-pressure signal controller; 13. Variable volume tank; 14. Tail sealing cavity; 15. Sliding vane; 16. Roller; 17. Oil separator; 18. First damping block; 19. Damping base; 20. Damping structure; 21. Second fixed partition; 22. Second damping block; 23. Third fixed partition; 24. First damping hole; 25. Second damping hole; 26. Connecting hole; 27. Housing; 28. Diverter plate; 29. ​​Vent hole; 30. Upper convex arc plate; 31. Intake pipe; 32. Oil return pipe; 33. Exhaust pipe; 34. First fixed partition. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] Existing variable displacement compressors primarily achieve variable displacement switching by locking the vanes with pins. The pin head and the vane tail form a sealed cavity at the vane tail. The pin tail is always connected to the suction end, while the pin head can be selectively connected to low or high pressure, thus locking and releasing the vanes. Figures 1 to 3 As shown, the contact force between the head of the variable displacement cylinder slide 15 and the roller 16 comes from the pressure of the sealing cavity 14 at the tail of the slide. When the variable displacement cylinder is working, the back-and-forth movement of the slide 15 causes the volume of the sealing cavity 14 at the tail of the slide to change periodically, generating pressure pulsation.

[0045] like Figures 1 to 3As shown, when the air conditioning system is under low load, the low-pressure control valve 4 is open and the high-pressure control valve 11 is closed. At this time, the compressor operates with a single cylinder, the lower variable displacement cylinder is in an unloaded state, the variable displacement cylinder vane 15 is locked by a pin, and the sealing cavity 14 at the tail of the variable displacement vane has no volume change. In the cooling and heating modes, there is no pressure pulsation at the tail of the variable displacement vane 15. When the air conditioning system is under medium or high load, the low-pressure control valve 4 is closed and the high-pressure control valve 11 is open. At this time, the compressor operates with two cylinders, the lower variable displacement cylinder is in a working state, and pressure pulsation is generated. When the air conditioning system is in cooling mode, the pressure pulsation is attenuated by the outdoor heat exchanger 6 and the throttling component 7 before entering the indoor heat exchanger 8. There is no sound transmission phenomenon in the indoor unit. However, when the air conditioning system is in heating mode, the pressure pulsation generated passes through the high-pressure control valve 11 and the four-way valve 9 before entering the indoor heat exchanger 8, generating severe low-frequency sound transmission.

[0046] To improve the above issues, see Figures 4 to 8 As shown, according to an embodiment of the present invention, the oil separator includes a housing 27, on which an air inlet pipe 31, an oil return pipe 32, and an air outlet pipe 33 are connected. A pressure pulsation adaptive device is provided inside the housing 27. The pressure pulsation adaptive device is located on the airflow path from the air inlet pipe 31 to the air outlet pipe 33. The pressure pulsation adaptive device can provide damping force to the airflow to reduce the transmission of pressure pulsation from the side where the air inlet pipe 31 is located to the side where the air outlet pipe 33 is located.

[0047] The oil separator incorporates a pressure pulsation adaptive device within the housing 27. This device provides damping force to the flowing air to reduce the transmission of pressure pulsations from the side of the inlet pipe 31 to the side of the outlet pipe 33. Therefore, it can automatically adjust the airflow damping force according to the pressure pulsations, thereby suppressing the transmission of pressure pulsations within the oil separator. This reduces the duration and lengthens the transmission path of pressure pulsations to the indoor unit. It effectively cuts off pressure pulsations generated at the tail of the variable displacement vane in the system transmission path, reducing their transmission to the indoor unit, optimizing the air path, and improving noise levels.

[0048] In one embodiment, the pressure pulsation adaptive device includes a first fixed partition 34 and a damping base 19 arranged sequentially at intervals along the airflow direction. The first fixed partition 34 is fixedly disposed relative to the housing 27. A first damping hole 24 is provided on the first fixed partition 34 to connect the spaces on both sides of the first fixed partition 34. A connecting hole 26 is provided on the damping base 19 to connect the spaces on both sides of the damping base 19. A first damping block 18 is disposed on the side of the damping base 19 facing the first fixed partition 34. The cross-sectional area of ​​the first damping block 18 gradually decreases along the direction close to the first damping hole 24. The first damping block 18 is offset from the connecting hole 26 and is disposed corresponding to the first damping hole 24. The damping base 19 can be movably disposed relative to the first fixed partition 34. A damping structure 20 is provided on the damping base 19. The damping structure 20 can provide a damping force to the damping base 19 to reduce the flow area of ​​the first damping hole 24. The damping force is positively correlated with the pressure pulsation.

[0049] In this embodiment, a first fixed baffle 34 and a damping base 19 are sequentially arranged along the path of the airflow from the inlet pipe 31 to the outlet pipe 33. The damping base 19 can slide relative to the first fixed baffle 34.

[0050] In one embodiment, to ensure the accuracy of the sliding direction and avoid relative rotation, a guide rail can be provided on the outer periphery of the damping base 19, and a groove can be provided on the inner periphery of the housing 27. The damping base 19 is slidably provided along the groove on the inner wall of the housing 27 via the guide rail. The periphery of the damping base 19 and the housing 27 are in a sliding seal fit to avoid the problem of airflow leakage.

[0051] In one embodiment, since the damping base 19 is provided with a damping structure 20, the rotation of the damping base 19 relative to the housing 27 can be limited by the damping structure 20. In this case, it is only necessary to consider preventing the damping base 19 from wagging in the axial direction during the sliding process relative to the housing 27. To achieve this purpose, the damping base 19 needs to have a certain thickness, which can ensure that the damping base 19 has sufficient contact length with the housing 27 in the axial direction, so as to ensure the stability of the damping base 19 during the movement and prevent the damping base 19 from overturning during the sliding process.

[0052] The damping structure 20 described above is, for example, a spring, or other structures that can provide elastic force.

[0053] When the pressure pulsation adaptive device is working, when the pressure pulsation peak passes through the first damping orifice 24, under the relatively increased pressure, the first damping block 18 moves downward, which increases the opening at the position of the first damping orifice 24. The larger the pressure pulsation peak, the greater the downward distance of the first damping block 18, and the greater the damping force provided by the damping structure 20 to the first damping block 18. The more difficult it is for the first damping block 18 to move downward, the more the flow rate of the pulsating airflow that can directly pass through the first damping orifice 24 is restricted. Therefore, the pulsating airflow can be suppressed. The larger the airflow pulsation, the more obvious the suppression effect, thereby effectively preventing the pulsation peak from being transmitted downward, thus achieving the regulation effect.

[0054] When the pressure pulsation trough passes through the first damping orifice 24, under the relatively reduced pressure, the first damping block 18 moves upward, causing the opening at the position of the first damping orifice 24 to decrease. Because it is in the pulsation trough, the pressure pulsation in the area between the damping base 19 and the first fixed partition 34 is compensated to the upper side of the first fixed partition 34. The reduced opening at the position of the first damping orifice 24 can suppress the transmission of the pressure pulsation in the area between the damping base 19 and the first fixed partition 34 to the upper side of the first fixed partition 34. The pressure in the area between the damping base 19 and the first fixed partition 34 can be maintained at a certain level, thereby effectively reducing airflow pulsation and achieving the effect of suppression and regulation.

[0055] The connecting hole 26 on the damping base 19 allows airflow to flow smoothly from the upper side to the lower side of the damping base 19. By offsetting the first damping block 18 with the connecting hole 26, the airflow in the connecting hole 26 is not obstructed by the first damping block 18, thus improving the airflow efficiency. At the same time, it ensures the diversion effect of the first damping block 18, allowing the airflow to quickly flow out of the connecting hole 26 after passing through the first damping block 18.

[0056] In one embodiment, the connecting hole 26 is an arc-shaped hole extending circumferentially along the damping base 19, with multiple arc-shaped holes arranged at intervals along the circumference. To improve the flow efficiency of airflow through the damping base 19 and reduce the flow resistance of airflow, the connecting hole 26 can be arranged as multiple sets of arc-shaped holes, each set of arc-shaped holes located on the same circumference and arranged at intervals along the circumference. The diameter of the circumference of each set of arc-shaped holes is different, thereby forming a multi-layer connecting hole 26 from the inside out, effectively increasing the airflow area of ​​the damping base 19.

[0057] To improve the flow diversion effect of the first damping block 18 and further reduce the flow resistance of the airflow after passing through the first damping block 18, so that the first damping block 18 can cooperate with the connecting hole 26 to enhance the airflow efficiency, in this embodiment, in two adjacent layers of connecting holes 26, the separation position of two adjacent connecting holes 26 in one layer of connecting holes 26 is located at the circumferential center of one of the connecting holes 26 in the other layer of connecting holes 26. The first damping block 18 is located in the area enclosed by these three connecting holes 26. In this way, when the airflow passes through the first damping block 18 and is diverted, the diverted airflow can quickly flow to the three connecting holes 26 located on the periphery of the first damping block 18 and flow out through the three connecting holes 26, thereby effectively utilizing the guiding effect of the peripheral wall of the first damping block 18.

[0058] In one embodiment, the pressure pulsation adaptive device further includes a second fixed partition 21 fixedly disposed relative to the housing 27. The second fixed partition 21 is disposed on the downstream side of the airflow of the damping base 19. A second damping hole 25 is provided on the second fixed partition 21 to connect the two sides of the space of the second fixed partition 21. The damping structure 20 is connected between the damping base 19 and the first fixed partition 34.

[0059] In this embodiment, by providing a second fixed partition 21 on the downstream side of the damping base 19 and opening a second damping hole 25 on the second fixed partition 21, the installation of the damping structure 20 can be facilitated, and the smooth flow of air can be ensured by utilizing the second damping hole 25.

[0060] The second fixed baffle 21 is located downstream of the damping base 19 and is fixedly mounted on the housing 27. Therefore, an appropriate number of damping structures 20 can be selected and arranged in suitable positions. For example, the number of damping structures 20 can be four, and they can be arranged circumferentially around the central axis of the damping base 19 to provide a more stable and reliable damping force for the damping base 19. The damping structures 20 need to be located outside the connecting hole 26 to avoid obstructing the airflow.

[0061] In one embodiment, a second damping block 22 is provided on the side of the damping base 19 facing the second fixed partition 21. The cross-sectional area of ​​the second damping block 22 gradually decreases along the direction close to the second damping hole 25, and the second damping block 22 is misaligned with the connecting hole 26.

[0062] In this embodiment, by providing a second damping block 22 on the side of the damping base 19 facing the second fixed partition 21, a layer of damping can be formed between the second damping block 22 and the second damping hole 25. This, combined with the damping engagement formed by the first damping block 18 and the first damping hole 24, creates a double-layer damping. Since the first damping block 18 is located on the upper side, it can be considered as the upper damping, and since the second damping block 22 is located on the lower side, it can be considered as the lower damping.

[0063] When the pressure pulsation peak passes through the upper damper, the upper damper, under the increased pressure, overcomes the spring force and moves downward, at which point the orifice opening at the upper damper increases. Since the lower damper is fixed on the same base as the upper damper, the lower damper moves downward synchronously, at which point the orifice opening at the lower damper decreases, preventing the pulsation peak from continuing to be transmitted downward. This combination of upper and lower dampers provides a more effective regulation of the pulsation peak.

[0064] Specifically, combined Figure 5 As shown, the oil separator has pressure pulsation adaptive suppression technology. When the pressure pulsation peak passes through the upper dampers a and b, under the relatively increased pressure, the upper dampers a and b move downwards, and the opening at the upper dampers a and b increases. The pulsation in region I of the oil separator is quickly transmitted to region II. At this time, the lower dampers c, d, and e move downwards synchronously with the upper dampers a and b, and the opening at the lower dampers c, d, and e decreases. The transmission of pulsation from region II to region III is reduced, preventing the pulsation peak from being transmitted downwards, thus achieving the regulation effect.

[0065] When the pressure pulsation trough passes through the upper dampers a and b, under the relatively reduced pressure, the upper dampers a and b move upward. Because they are at the pulsation trough, the pressure pulsation in oil separator region II compensates for the pressure pulsation in region I. The opening of the upper dampers a and b decreases, and the pressure pulsation in oil separator region II is transmitted to region I less. The pressure in region II remains at a certain level. At this time, the lower dampers c, d, and e move upward synchronously with the upper dampers a and b. The opening of the lower dampers c, d, and e increases, and the pressure in oil separator region II and region III quickly reaches equilibrium, achieving the effect of suppression and regulation.

[0066] The above structure can optimize the pressure pulsation transmission path and effectively suppress pressure pulsation.

[0067] In one embodiment, there are multiple first damping holes 24, which are evenly spaced along the circumference. There are also multiple second damping holes 25, one of which is located at the center of the second fixed partition 21, while the other second damping holes 25 are evenly spaced along the circumference. The first damping holes 24 and the second damping holes 25 are staggered along both the circumference and the radial direction.

[0068] In this embodiment, there are multiple first damping holes 24 and second damping holes 25, which are evenly spaced in the circumferential direction. A second damping hole 25 is also provided in the center of the second fixed partition 21, so that when the airflow flows through the first damping holes 24 and the second damping holes 25, the airflow distribution can be more uniform, further reducing the airflow resistance and improving the airflow efficiency.

[0069] In one embodiment, a plurality of first damping holes 24 are located on a first circumference, and a plurality of second damping holes 25, which are evenly spaced along the circumference, are located on a second circumference, wherein the diameter of the first circumference is smaller than the diameter of the second circumference.

[0070] In this embodiment, the first damping block 18 is set corresponding to the first damping hole 24, and the second damping block 22 is set corresponding to the second damping hole 25. Therefore, the multiple first damping holes 24 are evenly arranged in the circumferential direction, ensuring that the multiple first damping blocks 18 are evenly arranged in the circumferential direction. The multiple second damping holes 25 are arranged in the circumferential direction and the center, ensuring the uniformity of the arrangement of the multiple second damping holes 25. This makes the gas flow force on each first damping block 18 more balanced when the oil separator is working, and the damping base 19 will not be subjected to a swaying force due to uneven force. The gas flow force on each second damping block 22 is also more balanced, and the damping base 19 will not be subjected to a swaying force due to uneven force. This improves the operational stability and reliability of the pressure pulsation adaptive device.

[0071] In one embodiment, the first damping block 18 and the second damping block 22 are both frustums of a cone, and the angle between the generatrix of the frustum and the central axis is φ, where 0 < φ < 90°.

[0072] The damping structure used in this invention is mainly a spring-mass damping structure. The first damping block 18 and the second damping block 22 have a certain slope φ, where 0 < φ < 90°. Figure 6 As shown, damping devices are installed at the outlet or inlet positions of each damping orifice. The damping material can be engineering plastics such as polyoxymethylene (POM) that have a certain strength and good stability against refrigerants and refrigeration oils. The position of the damper is mainly determined by the spring force, its own weight, and the gas pressure it experiences. Different damping positions correspond to different orifice openings.

[0073] In one embodiment, the oil separator further includes a flow divider 28 disposed between the pressure pulsation adaptive device and the intake pipe 31 to divide the airflow flowing from the intake pipe 31 to the pressure pulsation adaptive device.

[0074] In this embodiment, the diverter plate 28 includes an arc-shaped plate segment, and the first fixed partition plate 34 also has an arc-shaped plate segment. The arc-shaped plate segment of the diverter plate 28 is provided with diverting holes, while the arc-shaped plate segment of the first fixed partition plate 34 is not provided with diverting holes. The first damping hole 24 is located on the periphery of the arc-shaped plate segment. An arc-shaped guide channel is formed between the arc-shaped plate segment of the diverter plate 28 and the arc-shaped plate segment of the first fixed partition plate 34. After the airflow enters from the intake pipe 31, it enters the arc-shaped guide channel. Since the arc-shaped plate segment of the first fixed partition plate 34 is not conductive, the airflow will flow along the arc-shaped guide channel to the periphery and flow out through the first damping hole 24 on the first fixed partition plate 34.

[0075] In one embodiment, the oil separator further includes a third fixed partition 23, on which a vent hole 29 is provided, and an upper convex arc plate 30 is provided in the middle of the third fixed partition 23, and the air inlet of the air outlet pipe 33 is provided corresponding to the upper convex arc plate 30.

[0076] In this embodiment, the upper convex arc plate 30 of the third fixed partition 23 is a baffle structure without a channel. The airflow enters the lower area from the third fixed partition 23 and is separated. The airflow enters the air outlet pipe 33 through the space between the upper convex arc plate 30 and the air outlet pipe 33 and flows out from the air outlet pipe 33. The upper convex arc plate 30 can play a converging role, making it easier for the airflow to flow out from the air outlet pipe 33 after it converges through the upper convex arc plate 30.

[0077] The oil return pipe 32 is located at the bottom of the housing 27, which allows lubricating oil to flow back to the compressor.

[0078] See also Figure 4 As shown, according to an embodiment of the present invention, the air conditioning system includes an oil separator 17, which is the oil separator described above.

[0079] In one embodiment, the air conditioning system further includes a variable capacity compressor and a variable capacity tank 13. The variable capacity tank 13 can be selectively connected to a high-pressure line or a low-pressure line. The high-pressure line and the exhaust port of the variable capacity compressor are connected to the intake pipe 31 of the oil separator 17. A high-pressure control valve 11 is provided on the high-pressure line.

[0080] In this embodiment, the air conditioning system includes a compressor, a low-pressure signal controller 3, a low-pressure control valve 4, a gas-liquid separator 5, an outdoor heat exchanger 6, a throttling component 7, an indoor heat exchanger 8, a four-way valve 9, an exhaust pressure pulsation sensor 10, a high-pressure control valve 11, a high-pressure signal controller 12, a variable-capacity tank 13, and an oil separator 17. The compressor's exhaust pipe 1 is connected to the oil separator 17. The variable-capacity tank 13 is connected to the front side of the oil separator 17 via a high-pressure pipeline. The variable-capacity tank 13 is connected to the compressor's suction pipe 2 via a low-pressure pipeline. The variable-capacity tank 13 can be selectively connected to a high-pressure gas source or a low-pressure gas source via the high-pressure control valve 11 on the high-pressure pipeline and the low-pressure control valve 4 on the low-pressure pipeline to realize the variable-capacity switching control of the compressor.

[0081] See also Figure 9 As shown, according to an embodiment of the present invention, the control method of the above-mentioned air conditioning system includes:

[0082] Select the operating mode of the air conditioning system;

[0083] When the air conditioning system is in dual-cylinder mode and in heating mode;

[0084] Obtain the operating frequency of the variable displacement compressor;

[0085] Obtain the pressure difference between the internal pressure of the variable displacement tank 13 and the suction pressure of the variable displacement compressor;

[0086] When the operating frequency is higher than aHz and the pressure difference is greater than bMpa, the high-pressure control valve 11 is closed and held for time t1. Then, the high-pressure control valve 11 is opened for time t2. Then, the process of closing for time t1 is repeated to perform cyclic control.

[0087] The operating frequency a, pressure difference b, time t1, and t2 mentioned above can be selected according to different models and specifications of the air conditioning system, and can be adjusted as needed. The suction pressure of the variable capacity compressor is the pressure of the suction pipe 2. In this embodiment, a is 50, b is 1.5, t1 is 60 min, and t2 is 5 min. When the air conditioning system is under medium or high load and the dual-cylinder mode is turned on, in the heating mode, after the high pressure control valve 11 is opened, when the frequency is higher than 50 Hz and the pressure difference between the variable capacity tank 13 and the suction pipe 2 is greater than 1.5 MPa, the high pressure control valve 11 is closed to cut off the pressure pulsation from being transmitted downward.

[0088] The frequency and differential pressure of closing the high-pressure control valve 11 are mainly determined based on the test results. When the variable displacement cylinder is working, due to the gap of the vane slot, the refrigerant compressed in the cylinder will leak to the tail of the vane to a certain extent. The pressure at the tail of the vane can be maintained continuously. During this period, it is periodically opened for 5 minutes and then closed for 60 minutes. It is mainly used to adjust the pressure at the tail of the vane to avoid the phenomenon of being too high or too low, so that the pressure is maintained at the set value as much as possible.

[0089] By controlling the control logic of the high-pressure control valve 11 in the air conditioning system under high-load heating mode, and ensuring the pressure difference between the head and tail of the pin, the high-pressure control valve 11 is opened intermittently. This reduces the time for pressure pulsation to be transmitted to the indoor unit, thereby effectively suppressing the transmission of pressure pulsation and improving the transmission noise.

[0090] See also Figure 10 As shown, compared with the prior art, the pressure pulsation is effectively suppressed after adopting the solution of the present invention.

[0091] In one embodiment, the steps for controlling the operating mode of the air conditioning system include:

[0092] Detect the load status of the variable displacement compressor;

[0093] When under low load, the single-cylinder mode is activated. In cooling or heating mode, the low-pressure control valve 4 is opened and the high-pressure control valve 11 is closed.

[0094] When under medium or high load, the dual-cylinder mode is activated. In cooling or heating mode, the high-pressure control valve 11 is opened and the low-pressure control valve 4 is closed.

[0095] In one embodiment, the step of activating the dual-cylinder mode under medium to high load conditions includes:

[0096] Control the single-cylinder start-up of the variable displacement compressor and establish a switching pressure differential;

[0097] When the switching pressure difference is greater than cMPa, the compressor will be switched from single-cylinder operation mode to dual-cylinder operation mode.

[0098] Here, c is, for example, 0.5, meaning that when the switching pressure difference is greater than 0.5MPa, the switching pressure is reached, and the variable displacement compressor can be switched from single-cylinder mode to dual-cylinder mode.

[0099] Example 1: Under medium and high load and heating mode, the high pressure control valve 11 is connected to the oil separator 17. When the valve is opened, the indoor heat exchanger 8 transmits a loud sound.

[0100] Example 2: Under medium and high loads and heating mode, the high pressure valve 11 is connected to the oil separator 17 and the valve is closed for verification: there is no sound transmitted from the indoor heat exchanger 8, and the exhaust pressure pulsation is small.

[0101] Example 3: Under medium and high load and heating mode, the high pressure valve 11 is connected to the oil separator 17 and the valve is opened for verification: the transmission sound of the indoor heat exchanger 8 is significantly reduced and the exhaust pressure pulsation is small.

[0102] Example 4: Under medium and high load and heating mode, the high pressure valve 11 is connected before the oil separator 17. Verification: There is no sound transmitted from the indoor heat exchanger 8.

[0103] Table 1

[0104]

[0105] Table 1 is a comparison table of the high pressure position of the high pressure control valve of the variable capacity cylinder and the pulsation of the exhaust pressure of the on / off valve under medium and high load heating modes.

[0106] As can be seen from the table, in Examples 1 and 2, when the high-pressure control valve 11 is connected to the downstream side of the oil separator, the difference in the effect of the high-pressure control valve 11 on the exhaust pressure pulsation is significant. When the high-pressure control valve 11 is open, the exhaust pressure pulsation is large, and the transmission noise is loud. Because the high-pressure control valve 11 is open for a short time and closed for a long time in the control logic of this application embodiment, it can effectively suppress pressure pulsation and transmission noise. In Examples 3 and 4, when the high-pressure control valve 11 is connected to the upstream side of the oil separator 17, the difference in the effect of the high-pressure control valve 11 on the exhaust pressure pulsation is small due to the influence of the oil separator 17. Regardless of whether the high-pressure control valve 11 is open or closed, the exhaust pressure pulsation is small, and the transmission noise is low, effectively suppressing pressure pulsation.

[0107] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0108] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0109] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An oil separator, characterized in that, Includes a housing (27), on which an air inlet pipe (31), an oil return pipe (32), and an air outlet pipe (33) are connected. A pressure pulsation adaptive device is provided inside the housing (27). The pressure pulsation adaptive device is located on the airflow path from the air inlet pipe (31) to the air outlet pipe (33). The pressure pulsation adaptive device can provide damping force to the airflow to reduce the transmission of pressure pulsation from the side where the air inlet pipe (31) is located to the side where the air outlet pipe (33) is located. The pressure pulsation adaptive device includes a first fixed partition (34) and a damping base (19) arranged sequentially at intervals along the airflow direction. The first fixed partition (34) is fixedly disposed relative to the housing (27). A first damping hole (24) is provided on the first fixed partition (34) to connect the spaces on both sides of the first fixed partition (34). A connecting hole (26) is provided on the damping base (19) to connect the spaces on both sides of the damping base (19). A first damping block (18) is provided on the side of the damping base (19) facing the first fixed partition (34). The cross-sectional area of ​​the damping block (18) gradually decreases along the direction close to the first damping hole (24). The first damping block (18) is offset from the connecting hole (26). The first damping block (18) is set corresponding to the first damping hole (24). The damping base (19) can be movably set relative to the first fixed partition (34). The damping base (19) is provided with a damping structure (20). The damping structure (20) can provide the damping base (19) with a damping force that reduces the flow area of ​​the first damping hole (24). The damping force is positively correlated with the pressure pulsation. The pressure pulsation adaptive device further includes a second fixed partition (21) fixedly disposed relative to the housing (27). The second fixed partition (21) is disposed on the downstream side of the airflow of the damping base (19). A second damping hole (25) is provided on the second fixed partition (21) to connect the two sides of the space of the second fixed partition (21). The damping structure (20) is connected between the damping base (19) and the first fixed partition (34). The damping base (19) is provided with a second damping block (22) on the side facing the second fixed partition (21). The cross-sectional area of ​​the second damping block (22) gradually decreases along the direction close to the second damping hole (25). The second damping block (22) is misaligned with the connecting hole (26).

2. The oil separator according to claim 1, characterized in that, The number of first damping holes (24) is multiple, and the multiple first damping holes (24) are evenly spaced along the circumference. The number of second damping holes (25) is multiple, one of the multiple second damping holes (25) is located at the center of the second fixed partition (21), and the other second damping holes (25) are evenly spaced along the circumference. The first damping holes (24) and the second damping holes (25) are staggered along the circumference and radial directions.

3. The oil separator according to claim 2, characterized in that, Multiple first damping holes (24) are located on a first circumference, and multiple second damping holes (25) are evenly spaced along the circumference and located on a second circumference. The diameter of the first circumference is smaller than the diameter of the second circumference.

4. The oil separator according to claim 1, characterized in that, The first damping block (18) and the second damping block (22) are both frustums, and the angle between the generatrix of the frustum and the central axis is φ, 0 < φ < 90°.

5. The oil separator according to claim 1, characterized in that, The oil separator further includes a flow divider (28), which is disposed between the pressure pulsation adaptive device and the air inlet pipe (31) to divide the airflow flowing from the air inlet pipe (31) to the pressure pulsation adaptive device; and / or, the oil separator further includes a third fixed partition (23), which is provided with a vent hole (29), and an upper convex arc plate (30) is provided in the middle of the third fixed partition (23), and the air inlet of the air outlet pipe (33) is provided corresponding to the upper convex arc plate (30).

6. An air conditioning system, comprising an oil separator (17), characterized in that, The oil separator (17) is the oil separator according to any one of claims 1 to 5.

7. The air conditioning system according to claim 6, characterized in that, The air conditioning system also includes a variable capacity compressor and a variable capacity tank (13). The variable capacity tank (13) can be selectively connected to a high-pressure pipeline or a low-pressure pipeline. The high-pressure pipeline and the exhaust port of the variable capacity compressor are connected to the intake pipe (31) of the oil separator (17). A high-pressure control valve (11) is provided on the high-pressure pipeline.

8. A control method for an air conditioning system as described in claim 7, characterized in that, include: Select the operating mode of the air conditioning system; When the air conditioning system is in dual-cylinder mode and in heating mode; Obtain the operating frequency of the variable displacement compressor; Obtain the pressure difference between the internal pressure of the variable displacement tank (13) and the suction pressure of the variable displacement compressor; When the operating frequency is higher than aHz and the pressure difference is greater than bMpa, the high pressure control valve (11) is closed and held for t1 time. Then the high pressure control valve (11) is opened for t2 time. Then the process of closing for t1 time is repeated to perform cyclic control.

9. The control method for an air conditioning system according to claim 8, characterized in that, The steps for controlling the operating mode of an air conditioning system include: Detect the load status of the variable displacement compressor; When under low load, the single cylinder mode is activated. In cooling or heating mode, the low pressure control valve (4) is opened and the high pressure control valve (11) is closed. When under medium or high load, the dual-cylinder mode is activated. In cooling or heating mode, the high-pressure control valve (11) is opened and the low-pressure control valve (4) is closed.

10. The control method for an air conditioning system according to claim 9, characterized in that, When under medium to high load, the steps to activate the dual-cylinder mode include: Control the single-cylinder start-up of the variable displacement compressor and establish a switching pressure differential; When the switching pressure difference is greater than cMPa, the compressor will be switched from single-cylinder operation mode to dual-cylinder operation mode.

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