A dual oil separator for a carbon dioxide heat pump unit

Abstract

The present invention relates to the technical field of refrigerant separation lubricants for heat pump mechanisms, and specifically, to a dual oil separator for a carbon dioxide heat pump unit, which includes a cylinder body. The cylinder body is sequentially provided with a first oil separation component, a filter element, and a second oil separation component from the inside to the outside. At the top of the first oil separation component, there is a third oil separation component for accelerating the vortex speed inside the first oil separation component, and an exhaust adjustment component for adjusting the exhaust speed of the filter element is arranged inside the third oil separation component. The second oil separation component includes a second separation cylinder fixedly arranged inside the cylinder body, and a second spiral plate is arranged on the inner wall of the second separation cylinder. The first oil separation component includes a first separation cylinder fixedly arranged inside the second separation cylinder, the filter element is arranged between the first separation cylinder and the second separation cylinder, a first spiral plate is arranged on the first separation cylinder, a diversion tube is arranged at the end of the first spiral plate at the bottom of the first separation cylinder, and the first eddy current area is connected to the second eddy current area through the diversion tube.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerant separation lubricants for heat pump mechanisms, and more specifically, to a dual oil separator for a carbon dioxide heat pump unit. Background Art

[0002] Separate the oil and refrigerant vapor in the heat pump unit. During the operation of the heat pump system, the high-pressure steam discharged by the compressor often contains a certain amount of lubricating oil. If this lubricating oil enters the condenser and evaporator along with the refrigerant, an oil film will be formed on the heat transfer wall surface, increasing the thermal resistance and thus reducing the heat transfer effect and refrigeration effect. Therefore, the core task of the oil separator is to ensure the effective separation of the lubricating oil and the refrigerant vapor, thereby protecting core components such as the compressor from oil and gas erosion, and at the same time improving the heat transfer efficiency and operating stability of the system.

[0003] There are many types of oil separators, and the common ones are four: washing type, centrifugal type, packing type, and filtering type. These different types of oil separators have differences in structure, but the common point is that they all have the function of separating lubricating oil and refrigerant vapor.

[0004] The core separation mechanism of the centrifugal oil separator lies in inducing a high-speed swirling flow field in the separation cylinder for the mixed gas through a specific internal structure. During this process, due to the gradient distribution of the centrifugal acceleration along the axial direction (the intensity of the centrifugal force field at the bottom is significantly higher than that at the top), the oil droplet separation efficiency shows spatial heterogeneity. Although the gas at the inlet section has a high initial kinetic energy, affected by the insufficient development of the swirling flow, the tangential velocity of the gas in the top region has not been fully developed, resulting in a weak centrifugal effect. This flow field characteristic causes the oil droplets in the top region to enter the discharge process before reaching the critical time for complete separation, thus forming a local weak area in the separation efficiency.

[0005] Based on this, the present invention discloses a dual oil separator for a carbon dioxide heat pump unit. Summary of the Invention

[0006] To solve the problem in the background technology that in a centrifugal oil separator, due to the axial gradient distribution of the centrifugal acceleration and the insufficient development of the top swirl, oil droplets are discharged with the air flow before reaching the critical separation time, forming a weak area of local separation efficiency, the present invention provides a dual oil separator for a carbon dioxide heat pump unit, which includes a cylinder body. From the inside to the outside of the cylinder body, a first oil separation component, a filter element, and a second oil separation component are sequentially arranged. At the top of the first oil separation component, a third oil separation component for accelerating the swirl speed in the first oil separation component is provided. The top of the third oil separation component is connected to an exhaust pipe, and an exhaust adjustment component for adjusting the exhaust speed of the filter element is arranged in the third oil separation component; wherein, the second oil separation component includes a second separation cylinder fixed in the cylinder body, and a second spiral plate is arranged on the inner wall of the second separation cylinder. The first oil separation component includes a first separation cylinder fixed in the second separation cylinder, the filter element is arranged between the first separation cylinder and the second separation cylinder, and a second eddy current area is formed between the second separation cylinder and the filter element; the first separation cylinder has an inverted conical structure, and a first spiral plate is arranged on the first separation cylinder, and a first eddy current area is formed in the first separation cylinder. At the end of the first spiral plate at the bottom of the first separation cylinder, a guide pipe that is connected and adapted to the spiral structure of the second spiral plate is provided, and the first eddy current area is connected to the second eddy current area through the guide pipe; a third eddy current area is formed between the filter element and the first separation cylinder; the top of the third eddy current area is connected to the third oil separation component through the exhaust adjustment component;

[0007] As a further improvement of this technical solution, one side of the top of the first separation cylinder is tangentially connected to an air inlet pipe, the bottom of the second separation cylinder is connected to an oil return pipe, the top end of the first spiral plate is located at the tangential position of the top of the first separation cylinder, and the top end of the first spiral plate is connected to the air inlet pipe. The end of the first spiral plate is connected to one end of the guide pipe, and the other end of the guide pipe passes through the filter element and is connected to the starting end of the second spiral plate on the inner wall of the second separation cylinder.

[0008] As a further improvement of this technical solution, the second separation cylinder has a regular conical structure, and the starting end of the second spiral plate is located at the bottom of the second separation cylinder, and the spiral structure of the second spiral plate is adapted to the spiral structure of the first spiral plate.

[0009] As a further improvement of this technical solution, the first spiral plate passes through the first separation cylinder and forms spiral structures on both the inner wall and the outer wall of the first separation cylinder.

[0010] As a further improvement of this technical solution, the filter element has a regular conical structure and is adapted to the structure of the second separation cylinder. The top of the second separation cylinder is in contact with the top of the filter element and is sealed.

[0011] As a further improvement of the present technical solution, a concave second oil drainage hole is provided at the bottom of the first separation cylinder, and the bottom of the first separation cylinder is communicated with the second separation cylinder through the second oil drainage hole; a plurality of first oil drainage holes are evenly arranged along the radial direction around the bottom of the filter element, and the bottom of the filter element is communicated with the second separation cylinder through the first oil drainage holes.

[0012] As a further improvement of the present technical solution, the third oil separation component includes a rotating rod rotatably connected to the top of the first separation cylinder and concentric with the first separation cylinder. An eddy current fan is fixedly provided at one end of the rotating rod located inside the top of the first separation cylinder, and a driving fan is fixedly provided at the other end of the rotating rod passing through the top of the first separation cylinder and located outside the top of the first separation cylinder.

[0013] As a further improvement of the present technical solution, the exhaust gas regulation component includes a fixing ring arranged on the periphery of the top of the first separation cylinder. The filter element is connected to the top of the first separation cylinder through the fixing ring. A chute is provided on the fixing ring, and a baffle is arranged on the fixing ring. A ball is slidably connected in the chute, and the baffle is slidably connected to the fixing ring through the ball. An air outlet groove adapted to the structure of the baffle and with a ring width smaller than that of the baffle is provided on the fixing ring within the interval of the sliding route of the baffle; a blowing air pipe is arranged on the baffle. The blowing air pipe has an L-shaped structure, and the horizontal end of the L-shaped structure of the blowing air pipe is in a conical structure. One end of the blowing air pipe is communicated with the third eddy current area through the baffle, and the other end is arranged tangentially pointing to the driving fan.

[0014] As a further improvement of the present technical solution, a third separation cylinder with a conical structure is arranged on the fixing ring. One end of the exhaust pipe extends into the third separation cylinder, and the other end extends to the outside of the cylinder body; a plurality of third oil drainage holes are provided on the part of the fixing ring located inside the third separation cylinder.

[0015] As a further improvement of the present technical solution, the exhaust gas regulation component further includes an adjusting sleeve rotatably connected to the outside of the exhaust pipe. One end of the adjusting sleeve is located inside the third separation cylinder, and the other end extends to the outside of the cylinder body to form a rotating part, and the adjusting sleeve is rotatably connected to the top of the cylinder body; a connecting rod is arranged at one end of the adjusting sleeve located inside the third separation cylinder, and the baffle is fixedly connected to the adjusting sleeve through the connecting rod; the arc length of the chute is adapted to the arc length of the air outlet groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. In this dual oil separator of a carbon dioxide heat pump unit, a multi-stage eddy current separation design is realized: by arranging the first oil separation component, the filter element and the second oil separation component, the first eddy current area, the second eddy current area and the third eddy current area are formed. The multi-stage separation structure enables the mixed gas to sequentially pass through eddy current separations of different intensities, which is beneficial to gradually improving the separation efficiency of oil droplets, ensuring that the oil droplets are effectively separated at different stages, and thus realizing more efficient oil-gas separation.

[0018] 2. In the double oil separator of this carbon dioxide heat pump unit, the spiral plates are used to achieve acceleration and guidance: The setting of the first spiral plate and the second spiral plate enables the mixed gas to generate rotational acceleration when passing through, enhancing the centrifugal force and facilitating the separation of oil droplets from the gas. At the same time, the guiding effect of the spiral plates enables the gas to flow orderly, reducing turbulence and further improving the separation effect.

[0019] 3. In the double oil separator of this carbon dioxide heat pump unit, the conical structure is used to converge kinetic energy: The first separation cylinder and the second separation cylinder adopt a conical structure, which is beneficial to converging the kinetic energy of the mixed gas, enabling the gas to have stronger kinetic energy when entering the next-stage separation area, thereby enhancing the separation effect. This design is convenient for improving the separation efficiency of oil droplets and reducing the situation of unseparated oil droplets being discharged with the air flow.

[0020] 4. In the double oil separator of this carbon dioxide heat pump unit, the connecting and accelerating functions of the guide pipe are realized: The guide pipe connects the first eddy current area and the second eddy current area, enabling the preliminarily separated mixed gas to smoothly enter the next-stage separation area. At the same time, the setting of the guide pipe also plays a role in accelerating the gas, which is beneficial to forming a stronger eddy current in the second eddy current area and further improving the separation efficiency.

[0021] 5. In the double oil separator of this carbon dioxide heat pump unit, the flexibility of the exhaust adjustment component is realized: By setting the exhaust adjustment component, including an adjustment sleeve, a baffle, and an air outlet groove, etc., the exhaust speed of the third eddy current area can be adjusted as needed. This design is convenient for flexible adjustment according to the separation situation of the mixed gas and the exhaust demand, thereby achieving more efficient oil-gas separation and exhaust control.

[0022] 6. In the double oil separator of this carbon dioxide heat pump unit, the complementary functions of the eddy current fan and the driving fan are realized: The eddy current fan and the driving fan in the third oil separation component cooperate with each other, using the kinetic energy of the gas passing through the third eddy current area to drive the fan blades to rotate, and then providing additional vortex acceleration for the first eddy current area. This design is beneficial to reducing the problem of the axial centrifugal acceleration gradient distribution in the first eddy current area and improving the overall separation efficiency and separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 is a schematic diagram of the internal structure of the cylinder body of the present invention;

[0025] Figure 3 is a schematic sectional view of the second separation cylinder of the present invention;

[0026] Figure 4 is a schematic sectional view of the first type of filter element of the present invention;

[0027] Figure 5 The second cross-sectional structure diagram of the filter element of the present invention;

[0028] Figure 6 The cross-sectional structure diagram of the first separation cylinder of the present invention;

[0029] Figure 7 is Figure 6 The enlarged structure diagram at position A in

[0030] Figure 8 The cross-sectional structure diagram of the third separation cylinder of the present invention;

[0031] Figure 9 is Figure 8 The enlarged structure diagram at position B in

[0032] Figure 10 The structure diagram of the eddy current fan of the present invention;

[0033] Figure 11 The first state diagram of the baffle of the present invention;

[0034] Figure 12 The second state diagram of the baffle of the present invention.

[0035] The meanings of each label in the figure are as follows:

[0036] 1, cylinder body; 2, intake pipe; 3, exhaust pipe; 4, return oil pipe; 5, first oil separation component; 6, filter element; 7, second oil separation component; 8, third oil separation component; 9, exhaust adjustment component; 10, first oil discharge hole; 11, first eddy current area; 12, second eddy current area; 13, third eddy current area; 14, fourth eddy current area;

[0037] 51, first separation cylinder; 52, first spiral plate; 53, diversion pipe; 54, second oil discharge hole;

[0038] 71, second separation cylinder; 72, second spiral plate;

[0039] 81, rotating rod; 82, eddy current fan; 83, driving fan; 84, air blowing pipe; 85, third separation cylinder;

[0040] 91, fixed ring; 92, chute; 93, ball; 94, baffle; 95, connecting rod; 96, adjusting sleeve; 97, air outlet groove; 98, third oil discharge hole. Specific embodiments

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] In the existing centrifugal oil separator, due to the axial gradient distribution of the centrifugal acceleration and the insufficient development of the top swirl, oil droplets are discharged with the air flow before reaching the critical separation time, forming a weak area of local separation efficiency.

[0043] Therefore, the present invention provides a dual oil separator for a carbon dioxide heat pump unit. Refer to Figures 1-6 As shown in the figure, it includes a cylinder body 1. The cylinder body 1 is sequentially provided with a first oil separation component 5, a filter element 6, and a second oil separation component 7 from inside to outside. And the first oil separation component 5, the filter element 6, and the second oil separation component 7 are sequentially communicated with each other from inside to outside.

[0044] Among them, refer to Figures 2-7 As shown in the figure, the second oil separation component 7 includes a second separation cylinder 71 fixedly arranged in the cylinder body 1 and having a positive conical structure. A second spiral plate 72 is arranged on the inner wall of the second separation cylinder 71. The first oil separation component 5 includes a first separation cylinder 51 fixedly arranged in the second separation cylinder 71. The filter element 6 is arranged between the first separation cylinder 51 and the second separation cylinder 71. A second eddy current area 12 is formed between the second separation cylinder 71 and the filter element 6. A third eddy current area 13 is formed between the filter element 6 and the first separation cylinder 51. And the filter element 6 is also of a positive conical structure and is adapted to the structure of the second separation cylinder 71. The top of the second separation cylinder 71 is in contact with the top of the filter element 6 and is hermetically connected.

[0045] Secondly, as Figures 4-6 shown in the figure, the first separation cylinder 51 has an inverted conical structure, and a first spiral plate 52 is arranged on the first separation cylinder 51. A first eddy current area 11 is formed inside the first separation cylinder 51. A diversion pipe 53 which is connected and adapted to the spiral structure of the second spiral plate 72 is arranged at the end of the first spiral plate 52 at the bottom of the first separation cylinder 51. The first eddy current area 11 is communicated with the second eddy current area 12 through the diversion pipe 53. And the starting end of the second spiral plate 72 is located at the bottom of the second separation cylinder 71, and the spiral structure of the second spiral plate 72 is adapted to the spiral structure of the first spiral plate 52.

[0046] That is to say, after the mixed gas is accelerated by the inverted cone structure in the first eddy current area 11, it enters the second eddy current area 12 through the guide pipe 53 with higher kinetic energy, forming a gradually enhanced centrifugal force field, solving the problem of the axial centrifugal acceleration gradient distribution, prolonging the residence time of oil droplets, avoiding the phenomenon of discharging before reaching the critical separation time, and realizing the cooperative acceleration of the double-cone separation cylinder.

[0047] Specifically, as Figure 6 shown, the top end of the first spiral plate 52 is located at the tangential position of the top of the first separation cylinder 51, and the top end of the first spiral plate 52 is connected to the intake pipe 2. In this way, the mixed gas entering the first eddy current area 11 through the intake pipe 2 will directly rush towards the starting end of the first spiral plate 52, and the end of the first spiral plate 52 is connected to one end of the guide pipe 53. The other end of the guide pipe 53 passes through the filter element 6 and is connected to the starting end of the second spiral plate 72 on the inner wall of the second separation cylinder 71. Therefore, with the help of the inverted cone structure of the first separation cylinder 51, after the mixed gas is fully accelerated through the first spiral plate 52, its kinetic energy will be stronger. Secondly, since the first spiral plate 52 is a spiral structure, it will also form an eddy current with a stronger rotational speed in the first separation cylinder 51, which is smaller than the second separation cylinder 71, enabling the first step of oil droplet separation of the mixed gas in the first eddy current area 11. For the mixed gas with insufficient centrifugal force at the top, it will finally flow to the position of the second spiral plate 72 through the guide pipe 53 and then further perform centrifugal separation in the second eddy current area 12. Moreover, as can be seen from the above, most of the mixed gas passing through the first eddy current area 11 has been separated. Secondly, the mixed gas ejected through the guide pipe 53 has stronger kinetic energy after being accelerated by the structure of the first separation cylinder 51 and the first spiral plate 52, which is more conducive to forming a strong eddy current in the second eddy current area 12 in the next step.

[0048] Secondly, as Figure 7 shown, the oil droplets separated in the first eddy current area 11 settle and gather at the bottom of the first separation cylinder 51. The bottom of the first separation cylinder 51 is provided with a concave second oil discharge hole 54. The bottom of the first separation cylinder 51 is connected to the second separation cylinder 71 through the second oil discharge hole 54. A plurality of first oil discharge holes 10 are uniformly arranged along the radial direction around the bottom of the filter element 6. The bottom of the filter element 6 is connected to the second separation cylinder 71 through the first oil discharge holes 10. In this way, the gathered oil droplets can finally flow into the bottom of the second separation cylinder 71, and the bottom of the second separation cylinder 71 is connected to an oil return pipe 4, so that the gathered lubricating oil is recycled.

[0049] Furthermore, as Figures 5-6As shown, the first spiral plate 52 is disposed through the first separation cylinder 51, forming spiral structures on both the inner and outer walls of the first separation cylinder 51. That is to say, in the third eddy current area 13, due to the characteristics of the filter element 6 and the conical structure of the first separation cylinder 51, combined with the setting that the first spiral plate 52 passes through the first separation cylinder 51, the gas passing through the filter element 6 passes through the first spiral plate 52 on the outer wall of the first separation cylinder 51 before accelerating and rising to the top position of the filter element 6, so that the gas can also form a certain eddy current in the third eddy current area 13. However, since the gas flow direction does not have directivity like that in the first eddy current area 11 and the second eddy current area 12, the eddy current in the third eddy current area 13 is not strong enough. However, after the centrifugal separation in the first eddy current area 11 and the second eddy current area 12, the gas in the third eddy current area 13 is nearly clean refrigerant gas. Therefore, this stage only serves as the first-level guarantee separation area. Secondly, the most important thing is to make the gas rushing towards the top of the filter element 6 have a certain vortex response, so that the kinetic energy of the gas is more concentrated, which is convenient for the subsequent utilization of the kinetic energy of this part of the gas.

[0050] That is to say, through the first eddy current area 11 (inner layer), the second eddy current area 12 (middle layer), and the third eddy current area 13 (outer layer) separated by the filter element 6, after the first / second eddy current areas complete the rough separation, the third eddy current area 13 uses the conical structure of the filter element 6 to guide the gas to spiral upward, and the residual kinetic energy of the first spiral plate 52 on the outer wall generates a weak vortex, forming a "rough separation - fine separation - final filtration" three-level barrier. The filter element 6 intercepts the escaped oil droplets, eliminates the local weak separation area, and realizes the dynamic separation of the three eddy current areas.

[0051] Furthermore, as shown in Figures 6-12 As shown, a third oil separation component 8 for accelerating the vortex speed in the first oil separation component 5 is provided at the top of the first oil separation component 5. The top of the third oil separation component 8 is connected to an exhaust pipe 3. An exhaust adjustment component 9 for adjusting the exhaust speed of the filter element 6 is provided in the third oil separation component 8. The top of the third eddy current area 13 is connected to the third oil separation component 8 through the exhaust adjustment component 9.

[0052] Specifically, as shown in Figure 6 and Figures 8-10 As shown, the third oil separation component 8 includes a rotating rod 81 rotatably connected to the top of the first separation cylinder 51 and concentric with the first separation cylinder 51. One end of the rotating rod 81 located inside the top of the first separation cylinder 51 is fixedly provided with a vortex fan 82, and the other end of the rotating rod 81 passing through the first separation cylinder 51 and located outside the top of the first separation cylinder 51 is fixedly provided with a driving fan 83.

[0053] Further, as shown in Figures 8-12As shown in the figure, the exhaust gas regulating assembly 9 includes a fixing ring 91 arranged on the outer periphery of the top of the first separation cylinder 51. The filter element 6 is connected to the top of the first separation cylinder 51 through the fixing ring 91. A chute 92 is formed on the fixing ring 91. A baffle 94 is arranged on the fixing ring 91. A ball 93 is slidably connected in the chute 92. The baffle 94 is slidably connected to the fixing ring 91 through the ball 93. An air outlet groove 97 which is adapted to the structure of the baffle 94 and has a ring width smaller than that of the baffle 94 is formed on the fixing ring 91 within the interval of the sliding route of the baffle 94. Moreover, the arc length of the chute 92 is adapted to the arc length of the air outlet groove 97.

[0054] Secondly, as shown in Figures 10-11 the figure, a blowing air pipe 84 is arranged on the baffle 94. The blowing air pipe 84 has an L-shaped structure, and the horizontal end of the L-shaped structure of the blowing air pipe 84 has a conical structure. One end of the blowing air pipe 84 is communicated with the third eddy current area 13 through the baffle 94, and the other end is arranged tangentially to the driving fan 83.

[0055] Furthermore, as shown in Figure 6 and Figure 8 the figure, a third separation cylinder 85 with a conical structure is arranged on the fixing ring 91. One end of the exhaust pipe 3 extends into the third separation cylinder 85, and the other end extends outside the cylinder body 1; and a plurality of third oil discharge holes 98 are formed on the part of the fixing ring 91 located inside the third separation cylinder 85.

[0056] Secondly, as shown in Figure 8 the figure, the exhaust gas regulating assembly 9 further includes an adjusting sleeve 96 rotatably connected to the outside of the exhaust pipe 3. One end of the adjusting sleeve 96 is located inside the third separation cylinder 85, and the other end extends outside the cylinder body 1 to form a rotating part, and the adjusting sleeve 96 is rotatably connected to the top of the cylinder body 1; a connecting rod 95 is arranged on one end of the adjusting sleeve 96 located inside the third separation cylinder 85. The baffle 94 is fixedly connected to the adjusting sleeve 96 through the connecting rod 95. That is to say, finally, the gas enters the third eddy current area 13 after passing through the first eddy current area 11 and the second eddy current area 12, and finally enters the third separation cylinder 85, that is, the fourth eddy current area 14, through the blowing air pipe 84, and then is discharged through the exhaust pipe 3. The gas passing through the blowing air pipe 84 can drive the driving fan 83 to cause the eddy current fan 82 located at the top of the first separation cylinder 51 to rotate, providing further eddy current acceleration in the first eddy current area 11 and improving the separation effect of the first step. Combining Figure 11 and Figure 12 it can be known that rotating the adjusting sleeve 96 can also control the size of the air outlet groove 97, and thus is equivalent to controlling the size of the exhaust valve of the third eddy current area 13, causing the exhaust efficiency to change. At the same time, the driving force for driving the driving fan 83 to rotate also decreases, and thus the eddy current acceleration in the first eddy current area 11 is adjusted to adapt to more working requirements.

[0057] That is to say, by driving the driving fan 83 through the blowing air pipe 84 at the top of the third eddy current area 13, the eddy current fan 82 is driven to rotate. The purified gas impacts the tangential structure of the driving fan 83 to generate a rotational torque. The eddy current fan 82 is linked through the rotating rod 81 to enhance the centrifugal acceleration in the first eddy current area 11. The exhaust kinetic energy is utilized to compensate for the swirling intensity at the top, solving the problem of insufficient development of the swirling flow at the top of the traditional structure and realizing kinetic energy feedback type eddy current compensation. At the same time, increasing the exposed area of the air outlet groove 97 can improve the exhaust efficiency, while reducing the driving kinetic energy of the blowing air pipe 84, dynamically balancing the separation intensity and the exhaust demand, and realizing stepless adjustment through the rotating part to adapt to the oil separation efficiency requirements under different working conditions and prevent the separation efficiency from decreasing due to overload.

[0058] Working principle:

[0059] The mixed gas enters the first separation cylinder 51 through the air inlet pipe 2, and then sprays towards the starting end of the first spiral plate 52, and then gradually spirals forward along the starting end of the first spiral plate 52, causing the mixed gas to start rotating and accelerating to generate a centrifugal force, thereby generating the first separation of oil droplets in the first eddy current area 11.

[0060] The mixed gas after the first separation is discharged through the guide pipe 53, and the oil droplets gather at the bottom of the first separation cylinder 51 and flow to the bottom of the second separation cylinder 71 through the second oil discharge hole 54. After the mixed gas is discharged through the guide pipe 53, due to the converging effect of the conical structure of the first separation cylinder 51, the kinetic energy of the mixed gas increases. Then, the gas that was not completely separated in the first separation enters the second eddy current area 12 with higher kinetic energy for further separation. The mixed gas rushes towards the starting end of the second spiral plate 72 through the guide pipe 53 and then spirals forward along the second spiral plate 72, thereby generating a rotational acceleration, causing different centrifugal forces between the oil droplets and the gas for the second separation. The gas is located closer to the center of the second separation cylinder 71 in the second eddy current area 12 due to the centrifugal force being less than that of the oil droplets, so it will gradually pass through the filter element 6, and the separated oil droplets flow along the inner wall of the second separation cylinder 71 to the bottom of the second separation cylinder 71 for further collection.

[0061] The mixed gas secondarily separated within the second eddy current region 12, combined with the further filtration of the filter element 6, enables the relatively cleaner gas originally located in the portion of the second eddy current region 12 closer to the center of the second separation cylinder 71 to be further filtered. Therefore, the mixed gas after passing through the filter element 6 is already relatively clean, and the mixed gas after passing through the filter element 6 is located within the third eddy current region 13. Since the ultimate gas flow outlets are mainly concentrated at the top, although there are first oil discharge holes 10 at the bottom, due to the presence of the oil liquid, the larger top flow outlets, and the presence of the first separation cylinder 51 within the third eddy current region 13, the mixed gas will spiral towards the top of the third eddy current region 13. There is a certain separation effect during this process. The separated oil droplets flow through the first oil discharge holes 10 to the bottom of the second separation cylinder 71, while the gas rushes towards the top of the third eddy current region 13 and is blown towards the drive fan 83 through the air duct 84. After the gas is accelerated by the conical structure of the drive fan 83, the kinetic energy of the gas is further increased, causing the drive fan 83 to rotate, and then driving the eddy current fan 82 located at the top within the first separation cylinder 51 to rotate, thereby further compensating for and increasing the spiral acceleration of the gas within the first eddy current region 11, improving the separation effect of the mixed gas within the first eddy current region 11, and reducing the problem of the axial centrifugal acceleration gradient distribution within the first eddy current region 11. And since the gas finally ejected through the air duct 84 is already very clean gas, there is no need to focus on the issue that the gas sprayed towards the drive fan 83 will interact with the oil liquid in the gas due to the drive fan 83 during this stage; moreover, the rotation of the drive fan 83 will also cooperate with the third separation cylinder 85 to form a fourth eddy current region 14, providing a final protective barrier for the ultimate gas. Some oil droplets may accumulate within the third separation cylinder 85 over a long time and finally flow back into the third eddy current region 13 through the third oil discharge holes 98. And since the gas within the third eddy current region 13 is relatively clean, there is no need to focus on the issue that the connection between the gas within the fourth eddy current region 14 and the third eddy current region 13 will cause a decrease in the cleanliness of the gas.

[0062] Furthermore, it needs to be considered that during the above process, if it is necessary to improve the exhaust efficiency, or in other words, the mixed gas has been separated very cleanly after passing through the first eddy current region 11 and the second eddy current region 12, and an adaptive adjustment needs to be made for the air duct 84 to drive the drive fan 83 to increase the rotational acceleration within the first separation cylinder 51, then the adjustment sleeve 96 can be rotated. Refer to Figure 11 and Figure 12It can be seen that the adjusting sleeve 96 drives the baffle 94 to slide along the chute 92, so that the air outlet groove 97 at the bottom of the baffle 94 is gradually exposed. Therefore, the exhaust speed in the third eddy current area 13 can be adjusted according to the size of the exposed air outlet groove 97. The larger the angle of the rotating adjusting sleeve 96, the larger the exposed air outlet groove 97, and the higher the exhaust efficiency. At the same time, the kinetic energy of the gas obtained by the air blowing pipe 84 will decrease, so the driving force received by the driving fan 83 will decrease, resulting in a decrease in the vortex acceleration in the first separation cylinder 51. In this way, the overall separation efficiency and separation effect can be adjusted to adapt to more working requirements.

[0063] In summary, it effectively solves the problem that in the existing centrifugal oil separator, due to the axial gradient distribution of the centrifugal acceleration and the insufficient development of the top swirl, the oil droplets are discharged with the air flow before reaching the critical separation time, forming a weak area of local separation efficiency.

[0064] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0065] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double oil separator for a carbon dioxide heat pump unit, characterized in that: The invention comprises a cylinder (1), wherein the cylinder (1) is provided with a first oil separation component (5), a filter element (6) and a second oil separation component (7) in sequence from the inside to the outside, wherein a third oil separation component (8) for accelerating the vortex speed in the first oil separation component (5) is provided on the top of the first oil separation component (5), and an exhaust regulating component (9) for regulating the exhaust speed of the filter element (6) is provided in the third oil separation component (8); The second oil separation assembly (7) comprises a second separation cylinder (71) fixedly mounted in the cylinder body (1), a second spiral plate (72) being arranged on the inner wall of the second separation cylinder (71), the first oil separation assembly (5) comprises a first separation cylinder (51) fixedly mounted in the second separation cylinder (71), a filter core (6) being arranged between the first separation cylinder (51) and the second separation cylinder (71), a second vortex zone (12) being formed between the second separation cylinder (71) and the filter core (6), and a third vortex zone (13) being formed between the filter core (6) and the first separation cylinder (51); The first separation cylinder (51) is in an inverted cone-shaped structure, and a first spiral plate (52) is provided on the first separation cylinder (51), which is located inside the first separation cylinder (51) to form a first vortex zone (11); a flow guide tube (53) connected to and matched with the spiral structure of the second spiral plate (72) is provided at the bottom of the first separation cylinder (51) and at the end of the first spiral plate (52); the first vortex zone (11) is connected to the second vortex zone (12) via the flow guide tube (53); The top of the third vortex area (13) is connected to the third oil separation component (8) through the exhaust adjustment component (9).

2. The double oil separator of the carbon dioxide heat pump unit according to claim 1, characterized in that: One side of the top of the first separation cylinder (51) is tangentially connected to an air intake pipe (2), and the bottom of the second separation cylinder (71) is connected to an oil return pipe (4). The top of the first spiral plate (52) is located at a tangential position of the top of the first separation cylinder (51), and the top of the first spiral plate (52) is connected to the air intake pipe (2). The end of the first spiral plate (52) is connected to one end of the guide pipe (53), and the other end of the guide pipe (53) passes through the filter element (6) and is connected to the starting end of the second spiral plate (72) on the inner wall of the second separation cylinder (71).

3. The double oil separator of the carbon dioxide heat pump unit according to claim 2, characterized in that: The second separation cylinder (71) has a right conical structure, and the starting end of the second spiral plate (72) is located at the bottom of the second separation cylinder (71), and the spiral structure of the second spiral plate (72) is compatible with the spiral structure of the first spiral plate (52).

4. The double oil separator of the carbon dioxide heat pump unit according to claim 3, characterized in that: The first spiral plate (52) is arranged through the first separation cylinder (51), and a spiral structure is formed on both the inner wall and the outer wall of the first separation cylinder (51).

5. The double oil separator of the carbon dioxide heat pump unit according to claim 4, characterized in that: The filter core (6) is a right conical structure and is compatible with the structure of the second separation cylinder (71); the top of the second separation cylinder (71) fits the top of the filter core (6) and is sealed.

6. The double oil separator of the carbon dioxide heat pump unit according to claim 5, characterized in that: A concave second oil drain hole (54) is provided at the bottom of the first separation cylinder (51), and the bottom of the first separation cylinder (51) is connected to the second separation cylinder (71) through the second oil drain hole (54); A plurality of first oil drain holes (10) are evenly arranged around the bottom of the filter core (6) along its radial direction, and the bottom of the filter core (6) is connected to the second separation cylinder (71) through the first oil drain holes (10).

7. The double oil separator of the carbon dioxide heat pump unit according to claim 1, characterized in that: The third oil separation assembly (8) comprises a rotating rod (81) rotatably connected to the top of the first separation cylinder (51) and concentric with the first separation cylinder (51); one end of the rotating rod (81) located inside the top of the first separation cylinder (51) is fixedly provided with a vortex fan (82); the other end of the rotating rod (81) passes through the first separation cylinder (51) and is located outside the top of the first separation cylinder (51) and is fixedly provided with a driving fan (83).

8. The double oil separator of the carbon dioxide heat pump unit according to claim 7, characterized in that: The exhaust adjustment component (9) comprises a fixing ring (91) arranged on the periphery of the top of the first separation cylinder (51); the filter element (6) and the top of the first separation cylinder (51) are connected via the fixing ring (91); a slide groove (92) is provided on the fixing ring (91); a baffle (94) is provided on the fixing ring (91); a ball (93) is slidably connected in the slide groove (92); the baffle (94) is slidably connected to the fixing ring (91) via the ball (93); an air outlet groove (97) adapted to the structure of the baffle (94) and having a smaller ring width than the baffle (94) is provided on the fixing ring (91) in an area of ​​the sliding path of the baffle (94); the arc length of the slide groove (92) is adapted to the arc length of the air outlet groove (97); A blowing pipe (84) is arranged on the baffle plate (94), the blowing pipe (84) is in an L-shaped structure, and the horizontal end of the L-shaped structure of the blowing pipe (84) is in a conical structure. One end of the blowing pipe (84) is connected to the third vortex area (13) through the baffle plate (94), and the other end is arranged tangentially to the driving fan (83).

9. The double oil separator of the carbon dioxide heat pump unit according to claim 8, characterized in that: A third separation cylinder (85) with a conical structure is arranged on the fixing ring (91), an exhaust pipe (3) is arranged on the top of the third separation cylinder (85), one end of the exhaust pipe (3) extends into the third separation cylinder (85), and the other end extends to the outside of the cylinder body (1); A plurality of third oil drain holes (98) are formed on the portion of the fixing ring (91) located inside the third separation cylinder (85).

10. The double oil separator of the carbon dioxide heat pump unit according to claim 9, characterized in that: The exhaust adjustment assembly (9) further comprises an adjustment sleeve (96) rotatably connected to the outside of the exhaust pipe (3); one end of the adjustment sleeve (96) is located in the third separation cylinder (85), and the other end extends to the outside of the cylinder (1) to form a rotating portion, and the adjustment sleeve (96) is rotatably connected to the top of the cylinder (1); A connecting rod (95) is provided on one end of the adjusting sleeve (96) located inside the third separation cylinder (85), and the baffle (94) is fixedly connected to the adjusting sleeve (96) via the connecting rod (95).

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