Double-oil separator of carbon dioxide heat pump unit

Abstract

The invention relates to the technical field of heat pump refrigerant separation lubricants, in particular to a carbon dioxide heat pump unit double-oil separator which comprises a barrel, and the barrel is sequentially provided with a first oil separation assembly, a filter element and a second oil separation assembly from inside to outside. A third oil separation assembly for accelerating the vortex speed in the first oil separation assembly is arranged at the top of the first oil separation assembly, an exhaust adjusting assembly for adjusting the exhaust speed of the filter element is arranged in the third oil separation assembly, the second oil separation assembly comprises a second separation cylinder fixedly arranged in the cylinder body, and a second spiral plate is arranged on the inner wall of the second separation cylinder; the first oil separation assembly comprises a first separation barrel fixedly arranged in the second separation barrel, the filter element is arranged between the first separation barrel and the second separation barrel, a first spiral plate is arranged on the first separation barrel, a flow guide pipe is arranged at the position, located at the tail end of the first spiral plate, of the bottom of the first separation barrel, and the first vortex area is communicated with the second vortex area through the flow guide pipe.

Description

Technical Field

[0001] The invention relates to the technical field of heat pump refrigerant separation lubricant, in particular to a double 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 from the compressor often contains a certain amount of lubricating oil. If these lubricating oils enter the condenser and evaporator with the refrigerant, an oil film will form on the heat transfer wall, increasing the thermal resistance, thereby reducing the heat transfer effect and refrigeration effect. Therefore, the core task of the oil separator is to ensure the effective separation of lubricating oil and refrigerant vapor, thereby protecting the compressor and other core components from oil and gas erosion, while improving the heat transfer efficiency and operation stability of the system.

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

[0004] The core separation mechanism of the centrifugal oil separator is to induce the mixed gas to form a high-speed cyclone field in the separation cylinder through a specific internal structure. In this process, the centrifugal acceleration is distributed in a gradient along the axial direction (the centrifugal field strength at the bottom is significantly higher than that at the top), resulting in spatial heterogeneity in the oil droplet separation efficiency. Although the gas in the inlet section has a high initial kinetic energy, the tangential velocity of the gas in the top area has not yet fully developed due to the influence of the insufficient development of the cyclone, resulting in a weak centrifugal effect. This flow field feature causes the oil droplets in the top area to enter the discharge process before reaching the critical time for complete separation, thus forming a local weak area of ​​separation efficiency.

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

[0006] In order to solve the problem that the centrifugal oil separator proposed in the background technology is insufficiently developed due to the axial gradient distribution of centrifugal acceleration and the top vortex, resulting in the oil droplets being discharged with the airflow before reaching the critical separation time, thus forming a local separation efficiency weak area, the present invention provides a double oil separator for a carbon dioxide heat pump unit, which includes a cylinder body, and 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, and the top of the first oil separation component is provided with a third oil separation component for accelerating the vortex speed in the first oil separation component, the top of the third oil separation component is connected to an exhaust pipe, and the third oil separation component is provided with an exhaust adjustment component for adjusting the exhaust speed of the filter element; wherein the second oil separation component includes a second separation component fixedly arranged in the cylinder body The first oil separation assembly comprises a first separation assembly fixedly mounted in the second separation assembly, a filter element is disposed between the first separation assembly and the second separation assembly, and a second vortex zone is formed between the second separation assembly and the filter element; the first separation assembly is in an inverted cone-shaped structure, and a first spiral plate is disposed on the first separation assembly, and a first vortex zone is formed in the first separation assembly, and a guide tube connected with and matched to the spiral structure of the second spiral plate is disposed at the end of the first spiral plate at the bottom of the first separation assembly, and the first vortex zone is connected with the second vortex zone through the guide tube; a third vortex zone is formed between the filter element and the first separation assembly; and the top of the third vortex zone is connected with the third oil separation assembly through the exhaust regulating assembly; As a further improvement of the present technical solution, one side of the top of the first separation cylinder is tangentially connected to an air inlet pipe, and the bottom of the second separation cylinder is connected to an oil return pipe. The top of the first spiral plate is located at a tangential position of the top of the first separation cylinder, and the top 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.

[0007] As a further improvement of the technical solution, the second separation cylinder is in the shape of a right cone, 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.

[0008] As a further improvement of the technical solution, the first spiral plate is arranged through the first separation cylinder, and a spiral structure is formed on both the inner wall and the outer wall of the first separation cylinder.

[0009] As a further improvement of the technical solution, the filter core is a right conical structure and is compatible with the structure of the second separation cylinder. The top of the second separation cylinder fits the top of the filter core and is sealed.

[0010] As a further improvement of the present technical solution, a concave second oil drain hole is provided at the bottom of the first separation cylinder, and the bottom of the first separation cylinder is connected to the second separation cylinder through the second oil drain hole; a plurality of first oil drain holes are evenly provided around the bottom of the filter element along its radial direction, and the bottom of the filter element is connected to the second separation cylinder through the first oil drain holes.

[0011] As a further improvement of the present technical solution, the third oil separation assembly includes a rotating rod rotatably connected to the top of the first separation cylinder and concentric with the first separation cylinder, a vortex 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 that passes through the first separation cylinder and is located outside the top of the first separation cylinder.

[0012] As a further improvement of the present technical solution, the exhaust adjustment component includes a fixed ring arranged on the outer periphery of the top of the first separation cylinder, the filter element and the top of the first separation cylinder are connected through the fixed ring, a slide groove is opened on the fixed ring, a baffle is arranged on the fixed ring, a ball is slidably connected in the slide groove, the baffle is slidably connected to the fixed ring through the ball, and an air outlet groove that is adapted to the baffle structure and has a ring width smaller than the baffle is opened on the fixed ring in the interval of the baffle sliding route; a blowing pipe is arranged on the baffle, the blowing pipe is L-shaped, and the horizontal end of the L-shaped structure of the blowing pipe is a conical structure, one end of the blowing pipe is connected to the third vortex zone through the baffle, and the other end points to the tangential setting of the driving fan.

[0013] As a further improvement of the present technical solution, a third separation cylinder with a conical structure is arranged on the fixed ring, one end of the exhaust pipe extends into the third separation cylinder, and the other end extends to the outside of the cylinder; a plurality of third oil drain holes are opened on the part of the fixed ring located in the third separation cylinder.

[0014] As a further improvement of the present technical solution, the exhaust adjustment assembly also includes an adjustment sleeve rotatably connected to the outside of the exhaust pipe, one end of the adjustment sleeve is located in the third separation cylinder, and the other end extends to the outside of the cylinder to form a rotating portion, and the adjustment sleeve is rotatably connected to the top of the cylinder; a connecting rod is provided on one end of the adjustment sleeve located in the third separation cylinder, and the baffle is fixedly connected to the adjustment sleeve through the connecting rod; the arc length of the slide groove is adapted to the arc length of the air outlet groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the double oil separator of the carbon dioxide heat pump unit, a multi-stage eddy current separation design is implemented: by setting a first oil separation component, a filter element and a second oil separation component, a first eddy current zone, a second eddy current zone and a third eddy current zone are formed. The multi-stage separation structure enables the mixed gas to be separated by eddy currents of different intensities in sequence, which is conducive to gradually improving the separation efficiency of oil droplets and ensuring that the oil droplets are effectively separated at different stages, thereby achieving more efficient oil and gas separation.

[0016] 2. In the double oil separator of the carbon dioxide heat pump unit, the spiral plate acceleration and guidance are realized: the arrangement of the first spiral plate and the second spiral plate enables the mixed gas to generate rotational acceleration when passing through, enhances the centrifugal force, and is conducive to the separation of oil droplets and gas. At the same time, the guiding effect of the spiral plate enables the gas to flow in an orderly manner, reduces turbulence, and further improves the separation effect.

[0017] 3. In the double oil separator of the carbon dioxide heat pump unit, a conical structure is used to gather kinetic energy: the first separation cylinder and the second separation cylinder adopt a conical structure, which is conducive to gathering the kinetic energy of the mixed gas, so that the gas has stronger kinetic energy when entering the next separation zone, thereby enhancing the separation effect. This design is convenient for improving the separation efficiency of oil droplets and reducing the situation where unseparated oil droplets are discharged with the airflow.

[0018] 4. In the double oil separator of the carbon dioxide heat pump unit, the guide pipe connection and acceleration are realized: the guide pipe connects the first vortex area with the second vortex area, so that the mixed gas after preliminary separation can smoothly enter the next level separation area. At the same time, the setting of the guide pipe also plays a role in accelerating the gas, which is conducive to forming a stronger vortex in the second vortex area and further improving the separation efficiency.

[0019] 5. In the dual oil separator of the carbon dioxide heat pump unit, the flexibility of the exhaust adjustment component is realized: by setting the exhaust adjustment component, including the adjustment sleeve, the baffle and the air outlet slot, the exhaust speed of the third vortex zone can be adjusted as needed. This design facilitates flexible adjustment according to the separation of the mixed gas and the exhaust demand, thereby achieving more efficient oil and gas separation and exhaust control.

[0020] 6. In the dual oil separator of the carbon dioxide heat pump unit, the complementary effect of the vortex fan and the drive fan is realized: the vortex fan and the drive fan in the third oil separation component cooperate with each other, and the kinetic energy of the gas passing through the third vortex area is used to drive the fan blades to rotate, thereby providing additional vortex acceleration for the first vortex area. This design is conducive to reducing the axial centrifugal acceleration gradient distribution problem in the first vortex area, and improving the overall separation efficiency and separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the cylinder of the present invention; Figure 3 It is a schematic cross-sectional structure diagram of the second separation cylinder of the present invention; Figure 4 This is a schematic diagram of a cross-sectional structure of a filter element of the present invention; Figure 5 The second schematic diagram of the cross-sectional structure of the filter element of the present invention; Figure 6 It is a schematic cross-sectional structure diagram of the first separation cylinder of the present invention; Figure 7 for Figure 6 A magnified view of the structure at center A; Figure 8 It is a schematic cross-sectional structure diagram of the third separation cylinder of the present invention; Fig. 9 for Figure 8 A magnified view of the structure at B in the middle; Fig.10 It is a schematic structural diagram of the vortex fan of the present invention; Fig.11 This is a schematic diagram of the state of the baffle of the present invention; Fig.12 This is the second state schematic diagram of the baffle of the present invention.

[0022] The meaning of each number in the figure is: 1. Cylinder; 2. Air inlet pipe; 3. Exhaust pipe; 4. Oil return pipe; 5. First oil separation assembly; 6. Filter element; 7. Second oil separation assembly; 8. Third oil separation assembly; 9. Exhaust adjustment assembly; 10. First oil drain hole; 11. First vortex zone; 12. Second vortex zone; 13. Third vortex zone; 14. Fourth vortex zone; 51. first separation cylinder; 52. first spiral plate; 53. flow guide tube; 54. second oil drain hole; 71. second separation cylinder; 72. second spiral plate; 81. Rotating rod; 82. Vortex fan; 83. Driving fan; 84. Blowing pipe; 85. Third separation cylinder; 91. Fixed ring; 92. Slide groove; 93. Ball bearing; 94. Baffle; 95. Connecting rod; 96. Adjusting sleeve; 97. Air outlet groove; 98. Third row of oil holes. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The existing centrifugal oil separator has insufficient axial gradient distribution of centrifugal acceleration and top swirl development, which causes oil droplets to be discharged with the airflow before reaching the critical separation time, forming a local separation efficiency weak area.

[0025] To this end, the present invention provides a double oil separator for a carbon dioxide heat pump unit, see Figure 1-Figure 6As shown, it includes a cylinder 1, on which a first oil separation component 5, a filter core 6 and a second oil separation component 7 are sequentially arranged from the inside to the outside, and the first oil separation component 5, the filter core 6 and the second oil separation component 7 are sequentially connected from the inside to the outside.

[0026] Among them, see Figure 2-Figure 7 As shown, the second oil separation component 7 includes a second separation cylinder 71 fixedly mounted in the cylinder body 1 and having a right conical structure, and 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 mounted in the second separation cylinder 71, and a filter element 6 is arranged between the first separation cylinder 51 and the second separation cylinder 71. A second vortex zone 12 is formed between the second separation cylinder 71 and the filter element 6, and a third vortex zone 13 is formed between the filter element 6 and the first separation cylinder 51. The filter element 6 also has 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 with the top of the filter element 6 and is sealed.

[0027] Secondly, if Figure 4-Figure 6 As shown, the first separation cylinder 51 has an inverted cone structure, and a first spiral plate 52 is arranged on the first separation cylinder 51, and a first vortex zone 11 is formed inside the first separation cylinder 51. A guide tube 53 connected with and matched with 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 vortex zone 11 is connected with the second vortex zone 12 through the guide tube 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 matched with the spiral structure of the first spiral plate 52.

[0028] That is to say, after the mixed gas is accelerated by the inverted cone structure in the first vortex zone 11, it enters the second vortex zone 12 with higher kinetic energy through the guide tube 53, forming a centrifugal force field that is gradually enhanced, solving the problem of axial centrifugal acceleration gradient distribution, extending the residence time of oil droplets, avoiding the phenomenon of discharge before reaching the critical separation time, and realizing the coordinated acceleration of the double-conical separation cylinder.

[0029] Specifically, Figure 6As shown, the top of the first spiral plate 52 is located at a tangential position on the top of the first separation cylinder 51, and the top of the first spiral plate 52 is connected to the intake pipe 2, so that the mixed gas entering the first vortex area 11 through the intake pipe 2 will directly rush to 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 tube 53, and the other end of the guide tube 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, the mixed gas will be accelerated throughout the first spiral plate 52, which will make the kinetic energy stronger. Secondly, the first spiral plate 52 is a spiral structure. , and will also form a vortex with a stronger rotation speed in the first separation cylinder 51 which is smaller than the second separation cylinder 71, so that the mixed gas can achieve the first step of oil droplet separation in the first vortex area 11. As for the mixed gas with insufficient centrifugal force at the top, it will eventually flow to the position of the second spiral plate 72 through the guide pipe 53, and then be further centrifuged in the second vortex area 12. In combination with the above, it can be seen that most of the mixed gas passing through the first vortex area 11 has been separated. Secondly, the mixed gas ejected through the guide pipe 53 has stronger acceleration kinetic energy after passing through the first separation cylinder 51 and the first spiral plate 52 structure, which is more conducive to forming a strong vortex in the second vortex area 12 in the next step.

[0030] Secondly, if Figure 7 As shown, the oil droplets separated by the first vortex zone 11 settle and gather at the bottom of the first separation cylinder 51, and a concave second oil discharge hole 54 is opened at the bottom of the first separation cylinder 51, and the bottom of the first separation cylinder 51 is connected with the second separation cylinder 71 through the second oil discharge hole 54, and a plurality of first oil discharge holes 10 are evenly opened along the radial direction around the bottom of the filter element 6, and the bottom of the filter element 6 is connected with the second separation cylinder 71 through the first oil discharge holes 10; in this way, the collected oil droplets can eventually flow into the bottom of the second separation cylinder 71, and the bottom of the second separation cylinder 71 is connected with the oil return pipe 4, so that the collected lubricating oil can be recovered.

[0031] Further, such as Figure 5-Figure 6As shown, the first spiral plate 52 is arranged through the first separation cylinder 51, and a spiral structure is formed on the inner wall and the outer wall of the first separation cylinder 51. That is to say, in the third vortex zone 13, through the characteristics of the conical structure of the filter element 6 and the first separation cylinder 51, combined with the arrangement of the first spiral plate 52 passing through the first separation cylinder 51, the gas passing through the filter element 6 passes through the first spiral plate 52 located on the outer wall of the first separation cylinder 51 before accelerating to the top position of the filter element 6, so that the gas can also form a certain vortex in the third vortex zone 13, but because its gas flow direction is not as directional as in the first vortex zone 11 and the second vortex zone 12, the vortex in the third vortex zone 13 is not strong enough, but after the centrifugal separation of the first vortex zone 11 and the second vortex zone 12, the gas located in the third vortex zone 13 is almost clean refrigerant gas, so this stage only serves as the first guarantee separation zone, and the second and most important thing is to make the gas rushing to 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 this part of the kinetic energy of the gas.

[0032] That is to say, the first vortex zone 11 (inner layer), the second vortex zone 12 (middle layer), and the third vortex zone 13 (outer layer) are separated by the filter element 6. After the first / second vortex zones complete rough separation, the third vortex zone 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 three-level barrier of "rough separation-fine separation-final filtration", intercepting escaping oil droplets through the filter element 6, eliminating local separation weak areas, and realizing dynamic separation of the three-level vortex zones.

[0033] For further information, see Figure 6-Figure 12 As shown, a third oil separation component 8 for accelerating the vortex speed in the first oil separation component 5 is arranged on the top of the first oil separation component 5, an exhaust pipe 3 is connected to the top of the third oil separation component 8, an exhaust regulating component 9 for regulating the exhaust speed of the filter element 6 is arranged in the third oil separation component 8, and the top of the third vortex area 13 is connected to the third oil separation component 8 through the exhaust regulating component 9.

[0034] Specifically, Figure 6 and Figure 8-Figure 10 As shown, the third oil separation assembly 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 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.

[0035] For further information, see Figure 8-Figure 12As shown, the exhaust adjustment component 9 includes a fixed 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 fixed ring 91, a slide groove 92 is opened on the fixed ring 91, a baffle 94 is arranged on the fixed ring 91, a ball 93 is slidably connected in the slide groove 92, the baffle 94 is slidably connected to the fixed ring 91 through the ball 93, and an air outlet groove 97 that is adapted to the structure of the baffle 94 and has a ring width smaller than that of the baffle 94 is opened on the fixed ring 91 in the interval of the sliding route of the baffle 94, and the arc length of the slide groove 92 is adapted to the arc length of the air outlet groove 97.

[0036] Secondly, see Figure 10-11 As shown, a blowing pipe 84 is arranged on the baffle 94. The blowing pipe 84 has an L-shaped structure, and the horizontal end of the L-shaped structure of the blowing pipe 84 has a conical structure. One end of the blowing pipe 84 is connected to the third vortex zone 13 through the baffle 94, and the other end points to the tangential setting of the driving fan 83.

[0037] Furthermore, Figure 6 and Figure 8 As shown, a third separation cylinder 85 with a conical structure is provided on the fixing ring 91, 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; and a plurality of third oil drain holes 98 are opened on the part of the fixing ring 91 located in the third separation cylinder 85.

[0038] Secondly, if Figure 8 As shown, the exhaust adjustment component 9 also includes 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 adjustment sleeve 96 located in the third separation cylinder 85, and the baffle 94 is fixedly connected to the adjustment sleeve 96 through the connecting rod 95, that is, the final gas passes through the first vortex zone 11 and the second vortex zone 12 and enters the third vortex zone 13, and finally enters the third separation cylinder 85, that is, the fourth vortex zone 14, through the blowing pipe 84, and then is discharged through the exhaust pipe 3, and the gas passing through the blowing pipe 84 can drive the driving fan 83 to cause the vortex fan 82 located at the top of the first separation cylinder 51 to rotate, thereby providing further vortex acceleration in the first vortex zone 11, thereby improving the separation effect of the first step, and combined with Fig.11 and Fig.12 It can be seen that rotating the adjustment sleeve 96 can also control the size of the air outlet slot 97, which is equivalent to controlling the size of the exhaust valve of the third vortex zone 13, so that the exhaust efficiency changes. At the same time, it also reduces the driving force for driving the driving fan 83 to rotate, thereby adjusting the acceleration of the vortex in the first vortex zone 11 to adapt it to more work requirements.

[0039] That is to say, the driving fan 83 is driven by the blowing pipe 84 at the top of the third vortex zone 13, which drives the vortex fan 82 to rotate. The purified gas impacts the tangential structure of the driving fan 83 to generate a rotational torque. The vortex fan 82 is linked by the rotating rod 81 to enhance the centrifugal acceleration of the first vortex zone 11, and the exhaust kinetic energy is used to compensate for the top vortex intensity, so as to solve the problem of insufficient development of the top vortex in the traditional structure and realize kinetic energy feedback vortex compensation. At the same time, increasing the exposed area of ​​the air outlet slot 97 can improve the exhaust efficiency, while reducing the driving kinetic energy of the blowing 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 being reduced due to overload.

[0040] Working principle: The mixed gas enters the first separation cylinder 51 through the intake pipe 2, and then sprays toward the starting end of the first spiral plate 52, and then gradually spirals forward along the starting end of the first spiral plate 52, so that the mixed gas starts to rotate and accelerate to generate centrifugal force, thereby generating the first separation of oil droplets in the first vortex area 11; After the first separation, the mixed gas is discharged through the guide tube 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 tube 53, due to the convergence effect of the conical structure of the first separation cylinder 51, the kinetic energy of the mixed gas is increased, so the gas that is not completely separated in the first separation obtains a higher kinetic energy and enters the second vortex area 12 for further separation. The mixed gas rushes to the starting end of the second spiral plate 72 through the guide tube 53, and then spirals forward along the second spiral plate 72, thereby generating a rotational acceleration, so that the oil droplets and the gas generate different centrifugal forces, and perform a second separation. Since the centrifugal force of the gas is smaller than that of the oil droplets, it is located in the second vortex area 12 close to the center of the second separation cylinder 71, so it will gradually pass through the filter element 6, and the separated oil droplets flow through the inner wall of the second separation cylinder 71 to the bottom of the second separation cylinder 71 for further gathering; The mixed gas separated for the second time in the second vortex zone 12 is further filtered by the filter element 6, so that the cleaner gas originally located in the second vortex zone 12 near the center of the second separation cylinder 71 is further filtered. Therefore, the mixed gas after passing through the filter element 6 is already relatively clean, and after passing through the filter element 6, the mixed gas is located in the third vortex zone 13. Since the final flow port of the gas is mainly concentrated at the top, although there is a first oil discharge hole 10 at the bottom, due to the presence of oil and the larger flow port at the top and the presence of the first separation cylinder 51 in the third vortex zone 13, the mixed gas will spirally rush to the top of the third vortex zone 13. There is a certain separation effect in this process. The separated oil droplets flow to the bottom of the second separation cylinder 71 through the first oil discharge hole 10, and the gas rushes to the top of the third vortex zone 13 and is blown to the drive fan 83 through the blow pipe 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 The vortex fan 82 located at the top of the first separation cylinder 51 is driven to rotate, thereby further compensating for and improving the spiral acceleration of the gas in the first vortex zone 11, improving the separation effect of the mixed gas in the first vortex zone 11, and reducing the problem of axial centrifugal acceleration gradient distribution in the first vortex zone 11. Since the gas finally ejected through the blowpipe 84 is already a very clean gas, it is not necessary to focus on the gas sprayed toward the driving fan 83 at this stage. The driving fan 83 will cause the oil in the gas to react with the driving fan 83; and the rotation of the driving fan 83 will also cooperate with the third separation cylinder 85 to form a fourth vortex zone 14, which serves as the last protective barrier for the final gas. For a long time, some oil droplets may gather in the third separation cylinder 85, and finally flow back to the third vortex zone 13 through the third oil drain hole 98. Since the gas in the third vortex zone 13 is relatively clean, it is not necessary to focus on the problem that the connection between the fourth vortex zone 14 and the gas in the third vortex zone 13 will lead to a decrease in the cleanliness of the gas.

[0041] It is further necessary to consider that, in the above process, if the exhaust efficiency needs to be improved, or the mixed gas has been separated very cleanly after passing through the first vortex zone 11 and the second vortex zone 12, the blowing pipe 84 drives the driving fan 83 to increase the rotation acceleration in the first separation cylinder 51, and the adjustment sleeve 96 can be rotated to adjust the rotation speed of the first separation cylinder 51. Fig.11 and Fig.12It can be known that the adjusting sleeve 96 drives the baffle plate 94 to slide along the slide groove 92, so that the air outlet groove 97 at the bottom of the baffle plate 94 is gradually exposed. Therefore, the exhaust speed in the third vortex zone 13 can be adjusted according to the exposed size of the air outlet groove 97. The greater the angle of rotating the adjusting sleeve 96, the greater the exposure of the air outlet groove 97, and the higher the exhaust efficiency. At the same time, the kinetic energy of the gas obtained by the blowing pipe 84 will be reduced, and the driving force of the driving fan 83 will be reduced, thereby reducing 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 work requirements.

[0042] In summary, the problem of the existing centrifugal oil separator being discharged with the airflow before reaching the critical separation time due to the axial gradient distribution of centrifugal acceleration and insufficient development of the top swirl flow, thus forming a local separation efficiency weak area, is effectively solved.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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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