Compressor oil-gas separator

Abstract

The application provides a compressor oil-gas separator, which comprises a main body part with a main cavity, an air inlet pipe in communication with the main cavity, and a guide device in the main cavity for guiding mixed oil gas to the inner wall of the main body part; a necking section is arranged at the outlet of the air inlet pipe, and a spacing area is arranged between the necking section and the guide device. The necking section is arranged at the outlet of the air inlet pipe, and the cooperating guide device is arranged at the outer side of the necking section, so that the mixed oil gas flow rate is increased at the spacing area depending on the necking section to form low pressure, the mixed oil gas diffused at the outlet is "adsorbed" and gathered to the guide device, and then is guided to the inner wall of the main cavity to rotate again, so that the separation efficiency of centrifugal separation is increased.

Description

Technical Field

[0001] This invention relates to the field of refrigeration control, and in particular to a compressor oil-gas separator. Background Technology

[0002] An air conditioning oil separator is a crucial functional component in the refrigeration circuit, located after the compressor. It separates the high-pressure refrigerant and refrigeration oil mixture discharged from the compressor, sending only the refrigerant to subsequent circuits while returning the separated refrigeration oil to the compressor. Refrigeration oil is essential for compressor lubrication; if it flows into the refrigeration circuit, it will stagnate, leading to reduced refrigeration efficiency. Therefore, improving the performance of the oil separator is vital for ensuring the refrigeration efficiency of the refrigeration system.

[0003] The centrifugal separation efficiency of refrigeration oil is affected by the flow rate of the mixed oil and gas exiting the intake pipe. However, when the air conditioner is running, the compressor output may decrease, resulting in a corresponding reduction in flow rate. Specifically, when the flow rate decreases, fluid diffusion immediately occurs within the container, weakening the centrifugal force within the oil separator and leading to incomplete separation of the refrigeration oil.

[0004] Chinese invention patent application CN116335947A discloses a compressor oil separation device. By adding a guide vane assembly inside, the centrifugal effect of rotational separation is enhanced, short-circuit flow is avoided, and oil-gas separation efficiency is improved. At the same time, by setting an oil baffle plate at the bottom inside, the high-speed airflow is isolated from the lubricating oil deposited at the bottom, which effectively reduces the secondary entrainment of oil droplets.

[0005] However, in oil separators, when the body is shaped by shrinking at both ends, it is impossible to add a structure larger than the shrinkage hole inside the container after the body is shaped, making it difficult to achieve complex functions. In other words, the structure disclosed in CN116335947A is not only unsuitable for oil separators with shrinking at both ends of the body, but also has a complex structure and high manufacturing cost. Summary of the Invention

[0006] To address the above problems, this invention proposes a compressor oil-gas separator.

[0007] The main contents of this invention include:

[0008] A compressor oil-gas separator includes a main body having a main cavity, an inlet pipe disposed on one side of the upper part of the main body and communicating with the main cavity, an outlet disposed at the upper end of the main body and communicating with the main cavity, an oil outlet disposed at the lower end of the main body and communicating with the main cavity, and a guide device located in the main cavity for guiding the mixed oil-gas to the inner wall of the main body.

[0009] The intake pipe includes a first section extending out of the main cavity and a second section extending into the main cavity. The end of the second section away from the first section has a constricted section with an inner diameter smaller than that of the second section. The guide device is located on the side of the constricted section away from the second section.

[0010] An interval area is provided between the constricted section and the guide device.

[0011] Preferably, the guiding device includes a guiding body with a guiding channel, the guiding channel being coaxially arranged with the constricted section and facing the inlet of the constricted section, and the inner diameter of the guiding channel being larger than the inner diameter of the air intake pipe.

[0012] Preferably, the guide channel extends along the circumferential direction of the constricted section.

[0013] Preferably, an air outlet is provided with an air outlet pipe, the air outlet pipe extending into the main cavity, and the guide body is fixedly disposed on the outer wall of the portion of the air outlet pipe extending into the main cavity.

[0014] Preferably, the guide body extends along the axial direction of the main cavity.

[0015] Preferably, an air outlet is provided with an air outlet pipe, and a portion of the air outlet pipe extends into the main cavity; the outer curved peripheral wall of the guide body is fixedly connected to the inner wall of the main body, and the inner curved peripheral wall of the guide body is fixedly connected to the outer wall of the portion of the air outlet pipe extending into the main cavity.

[0016] Preferably, the guiding device includes a guide plate assembly; the guide plate assembly includes a first sector plate, the upper surface of the first sector plate being located on the same plane as the central axis of the constricted section.

[0017] Preferably, the guide plate assembly further includes at least one second sector plate, which is positioned lower than the first sector plate along the axial direction of the main cavity.

[0018] Preferably, the first sector plate is fixedly disposed on the inner wall of the main body.

[0019] Preferably, the second segment is in the shape of a bent tube.

[0020] The beneficial effects of this invention are as follows: This invention proposes a compressor oil-gas separator, which sets a constriction section at the outlet of the air inlet pipe, and at the same time sets a matching guide device on the outside of the constriction section. This allows the mixed oil-gas that diffuses at the outlet to be "adsorbed" and gathered by the guide device in the interval area by increasing the flow rate of the mixed oil-gas in the constriction section, so as to guide it to the inner wall of the main cavity and rotate it again, thereby increasing the separation efficiency of centrifugal separation. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of an existing oil-gas separator;

[0022] Figure 2 This is a schematic diagram of the internal structure of an existing oil-gas separator;

[0023] Figure 3 This is a schematic diagram of the internal structure of Embodiment 1 of the present invention;

[0024] Figure 4 This is a partial structural diagram of the internal structure of Embodiment 1 of the present invention;

[0025] Figure 5 This is a schematic diagram of the internal structure of Embodiment 2 of the present invention;

[0026] Figure 6 This is a schematic diagram of the internal structure of Embodiment 3 of the present invention;

[0027] Figure 7 This is a schematic diagram of the internal structure of Embodiment 4 of the present invention;

[0028] Figure 8 A comparison chart of simulation results between the existing oil-gas separator and Example 3;

[0029] Figure 9 This is a diagram showing the location of the detection points in the simulation comparison experiment;

[0030] Figure label:

[0031] 1-Main body; 1-1-First section; 1-2-Second section; 1-3-Narrowing section; 100-Main cavity; 1000-Interval area; 11, 11'-Guide body; 1100-Guide flare; 12-First sector plate; 120-Upper surface of the first sector plate; 13-Second sector plate;

[0032] 2-Upper contraction section; 3-Lower contraction section; 4, 4'-Inlet pipe; 5-Outlet pipe; 500-Outlet port; 6-Oil outlet pipe; 600-Oil outlet port; 7-External inlet pipe; L-Central axis of guide channel; W1, W2-Welding position; S-Fluid flow direction. Detailed Implementation

[0033] The technical solution protected by this invention will be described in detail below with reference to the accompanying drawings.

[0034] This invention proposes a compressor oil-gas separator. Through structural modifications at the outlet of the inlet pipe and the accompanying guiding device, it can guide more of the mixed oil and gas entering the separator cavity to rotate and flow rapidly along the cavity wall, thereby improving the separation efficiency of centrifugal separation. This is especially beneficial for compressors with shapes like... Figure 1The oil-gas separator shown has a conical upper constriction section 2 and a lower constriction section 3 at the upper and lower ends of the main body 1, respectively, which makes it impossible to set up a complex structure in the cavity to improve the separation efficiency. Of course, the improved structure proposed in this invention is not limited to such a structure. Figure 1 The oil separator shown.

[0035] Please refer to Figure 1 and Figure 2 The existing oil-gas separator includes an air inlet on the outer peripheral wall of the main body 1, in which an air inlet pipe 4 is disposed, pre-assembled tangentially to the main body along the outer circumference of the main body, and the mixed oil and gas can be introduced through an external air inlet pipe 7; an air outlet 500 is provided at its upper part, and an air outlet pipe 5 is disposed in the air outlet 500, partially extending into and out of the main cavity 100 of the main body 1; the mixed oil and gas entering through the air inlet pipe 4 rotates and flows along the inner wall of the main cavity 100, during which the gaseous refrigerant can be transported backward through the air outlet pipe 5, while the atomized refrigeration oil is liquefied and separated and sent back to the compressor through an external oil outlet pipe connected to the oil outlet. Figure 2 The existing oil-gas separator shown exhibits a problem where, when the flow rate of the fed mixed oil and gas decreases, fluid diffusion occurs within the container. This weakens the centrifugal force within the separator, leading to incomplete separation of the refrigeration oil. The corresponding simulation scenario can be found in the appendix. Figure 8 The diagram on the left side of the middle page.

[0036] This invention, based on existing oil-gas separators, solves the problems of fluid diffusion and reduced centrifugal force by modifying the structure at the outlet of the inlet pipe and adding a guiding device. Specifically, this invention improves separation efficiency by providing a constricted section 1-3 at the end of the portion of the inlet pipe 4 located within the main cavity 100, and simultaneously providing a guiding device 11 on its axial outer side. Specifically, the inlet pipe 4 includes a first section 1-1 extending outside the main cavity and a second section 1-2 extending inside the main cavity. The end of the second section 1-2 away from the first section 1-1 has a constricted section 1-3 with an inner diameter smaller than that of the second section 1-2. The guiding device is located on the side of the constricted section 1-3 away from the second section 1-2. A gap region 100 is provided between the constricted section 1-3 and the guiding device 11. (Refer to...) Figure 4. The constriction section 1-3 can accelerate the flow rate of the fluid transported through the first section 1-1 and the second section 1-2. That is, the flow rate of the mixed oil and gas flowing out of the constriction section 1-3 becomes faster, and the flow rate of the fluid entering the interval region 100 is faster than the flow rate of the fluid flowing in from the compressor. This creates a low-pressure area in the interval region, where the fluid pressure is lower than the pressure of the fluid being supplied. Since the fluid pressure in the interval region is lower than the pressure near the constriction section 1-3, it creates a certain "adsorption" effect on the fluid diffusing to the vicinity of the constriction section 1-3, guiding more fluid to the guide device. Of course, the length of the interval region should not be too long or too short, and should be set according to the dimensions of other structures. The guide device, due to its larger inner diameter, can accommodate a larger range of fluid, and the flow rate of the fluid entering the guide device is faster than the flow rate of the fluid being supplied to the main cavity. The guide device guides the fluid to the inner wall of the main cavity 100, causing the fluid to rotate and flow along the inner wall. The faster the flow rate of the fluid on the inner wall, the higher the efficiency of centrifugal separation.

[0037] The following will provide a detailed explanation through various embodiments.

[0038] Example 1

[0039] In this embodiment, as Figure 3 and Figure 4 As shown, the guide device is in the shape of a straight tube. The guide device includes a guide body with a guide channel. The guide channel is coaxially arranged with the constricted section, that is, the central axis of the guide channel coincides with the central axis L of the air intake pipe 4, and is arranged behind (outer side) the constricted section 1-3 along the fluid flow direction.

[0040] Furthermore, in this embodiment, the intake pipe is also straight, that is, the central axes of the first segment 1-1, the second segment 1-2, and the constricted segment 1-3 all coincide, and the inner diameter of each segment can be the same, or the inner diameter of the first segment 1-1 can be larger than the inner diameter of the second segment 1-2, and the inner diameter of the second segment 1-2 can be larger than the inner diameter of the constricted segment 1-3. Furthermore, the inner diameters of the first segment 1-1 and the second segment 1-2 can also be tapered with a gradually decreasing diameter to further increase the fluid velocity; however, the inner diameter of the guide channel is larger than the inner diameter of any segment of the intake pipe.

[0041] Furthermore, the length of the guide channel should not be too short or too short. It can be determined comprehensively based on the fluid flow rate and the size of the main cavity, with the aim of guiding the fluid to the inner wall of the main cavity and making it rotate and flow along the inner wall.

[0042] To assemble the guide device into the main cavity, the oil-gas separator can be configured as at least two parts, such as the main body 1 and the upper constriction part 2 as two independent parts. First, the inlet pipe 4 can be inserted tangentially along the outer circumference of the main body 1, so that the second section 1-2 is located within the main cavity 100. Then, the guide device 11 can be placed into the main cavity 100. In this embodiment, the guide body can be fixedly connected to the outer wall of the portion of the outlet pipe 5 extending into the main cavity by brazing or other welding methods, such as... Figure 3 The short red line indicates the welding position W1.

[0043] Example 2

[0044] The difference between this embodiment and Embodiment 1 lies in the structure of the guiding device. In this embodiment, the guiding body 11' extends circumferentially along the main cavity. That is, the guiding body 11' is in the shape of a curved tube. To ensure the "suction" effect, the vertical center line of the plane where the guide body 11' faces the inlet of the constricted section 1-3 coincides with the central axis of the constricted section 1-3; and the central axis of the guiding body 11' extends circumferentially along the main cavity.

[0045] In this embodiment, one reason for setting the guide device in a bent tube shape is that in Embodiment 1, the welding between the guide body and the air outlet pipe is a point contact, which may result in a weak weld. Figure 5 As can be seen from the welding position W2 indicated by the red arc in the middle, in this embodiment, the guide body can form two line connections, that is, the outer curved peripheral wall of the guide body 11' is fixedly connected to the inner wall of the main body 1, and the inner curved peripheral wall of the guide body 11' is fixedly connected to the outer wall of the part of the air outlet pipe 5 extending into the main cavity.

[0046] The fixing method can be the welding method described in Example 1, and the assembly process is also as described in Example 1, so it will not be repeated here.

[0047] Furthermore, in this embodiment, the curvature of the curved guide body is in the range of 60° to 120°, and can be adjusted accordingly based on fluid flow rate, main cavity size, etc., to ensure a better separation effect.

[0048] Example 3

[0049] The difference between this embodiment and embodiment two is that the curved guide device is set as a plate-like structure, specifically, as shown in the example below. Figure 6As shown, the guiding device includes a guide plate assembly; the guide plate assembly includes a first sector plate 12 and a second sector plate 13 arranged vertically, the first sector plate 12 and the second sector plate 13 are arranged along the axial direction of the main cavity, and a guiding space is formed between them. The plane parallel to the first sector plate and the second sector plate, where the central axis of the guiding space is located, is on the same plane as the central axis of the constricted section 1-3 (as shown by the orange arrow in the figure).

[0050] To improve the separation effect, the air intake pipe can be positioned as high as possible in the main cavity. However, due to the limitations of the upper contraction section and considering the arrangement space of the first sector plate 12, the upper surface 120 of the first sector plate 12 should be at least flush with the highest cutting plane of the constriction section 1-3.

[0051] In this embodiment, the first sector plate 11 and the second sector plate 12 can be welded and fixedly disposed on the inner wall of the main body 1. Since the sector plates have a certain thickness, they can form a certain surface contact with the inner wall of the main body 1, resulting in a more secure connection.

[0052] Furthermore, the first sector plate 11 and the second sector plate 12 can also be welded to the outer wall of the vent pipe 5 or simultaneously connected to the inner wall of the main body 1 and the outer wall of the vent pipe 5.

[0053] The assembly process in this embodiment is similar to that in Embodiment 1, and will not be described again here.

[0054] In this embodiment, the curvature of the first sector plate and the second sector plate is in the range of 60° to 120°, and can be adjusted accordingly based on the fluid flow rate, the size of the main cavity, etc., to ensure a better separation effect.

[0055] Example 4

[0056] The difference between this embodiment and embodiment one is that the second section 1-2 of the intake pipe is curved, as shown below. Figure 7 As shown, the outer curved wall of the intake pipe 4' is located on the radially inner side, while the inner curved wall is located on the radially outer side. The central axis of the straight-tube-shaped guide device 11 coincides with the vertical centerline of the plane where the outlet of the constricted section 1-3 of the intake pipe is located.

[0057] A variation of Embodiment 4 could be that the intake pipe in Embodiments 2 and 3 is configured as a bent pipe.

[0058] The assembly process of this embodiment and its variations is similar to that of Embodiment 1, and will not be repeated here.

[0059] Figure 8 Given Figure 2 The given existing structure and Figure 6Simulation comparison results corresponding to the embodiments. The specific simulation location is... Figure 2 The flow velocities at the outlet wall 1101 and its opposite wall 1102 of the intake pipe were measured. The mixed oil and gas were assumed to be in a gaseous state, with refrigerant R410A introduced through the intake pipe at a flow rate of 799 kg / h. The length of the corresponding interval area was set to 1 mm, and the inner diameter of the main cavity was 55 mm. Simultaneously, measurements were taken at several calibration points within an 18 mm radius of the intake pipe's center. The specific flow velocity data for each detection point are shown in Table 1, and the locations of each detection point are as follows: Figure 9 As shown.

[0060]

[0061] As shown in Table 1, the average flow velocity of the existing structure is 7049 mm / s; while the average flow velocity of Example 3 reaches 7363 mm / s. Compared with the existing structure, the flow velocity of Example 3 in the detection area is increased by approximately 4.5%. Meanwhile, as... Figure 8 As shown in the color gradient diagram, the red area indicates high-speed flow, while the blue area represents low-speed flow. The design scheme of this invention can effectively achieve fluid convergence and significantly improve oil separation efficiency by increasing the flow rate.

[0062] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A compressor oil-gas separator characterized by, It includes a main body having a main cavity, an air inlet pipe disposed on one side of the upper part of the main body and communicating with the main cavity, an air outlet disposed at the upper end of the main body and communicating with the main cavity, an oil outlet disposed at the lower end of the main body and communicating with the main cavity, and a guide device located in the main cavity for guiding the mixed oil and gas to the inner wall of the main body. The intake pipe includes a first section extending out of the main cavity and a second section extending into the main cavity. The end of the second section away from the first section has a constricted section with an inner diameter smaller than that of the second section. The guide device is located on the side of the constricted section away from the second section. An interval area is provided between the constricted section and the guide device.

2. A compressor oil-gas separator according to claim 1, characterized in that The guiding device includes a guiding body with a guiding channel, the guiding channel being coaxially arranged with the inlet of the constricted section and the constricted section, and the inner diameter of the guiding channel being larger than the inner diameter of any section of the intake pipe.

3. A compressor oil-gas separator according to claim 2, characterized in that The guide channel extends along the axial direction of the constricted section.

4. A compressor oil-gas separator according to claim 3, characterized in that An air outlet is provided with an air outlet pipe, and part of the air outlet pipe extends into the main cavity. The guide body is fixedly disposed on the outer wall of the part of the air outlet pipe that extends into the main cavity.

5. A compressor oil-gas separator according to claim 2, wherein The guide body extends circumferentially along the main cavity.

6. A compressor oil-gas separator according to claim 5, characterized in that An air outlet is provided with an air outlet pipe, and part of the air outlet pipe extends into the main cavity; the outer curved peripheral wall of the guide body is fixedly connected to the inner wall of the main body, and the inner curved peripheral wall of the guide body is fixedly connected to the outer wall of the part of the air outlet pipe that extends into the main cavity.

7. A compressor oil-gas separator according to claim 1, wherein The guiding device includes a guide plate assembly; the guide plate assembly includes a first sector plate and a second sector plate arranged vertically, a guiding area is formed between the first sector plate and the second sector plate, and the distance between the first sector plate and the second sector plate is not less than the inner diameter of the constricted section.

8. A compressor oil-gas separator according to claim 7, characterized in that The plane containing the central axis of the guide area and parallel to the first sector plate is called the central plane, and the central axis of the constricted section is located on the central plane.

9. A compressor oil gas separator according to claim 7, wherein, The first sector plate is fixedly installed on the inner wall of the main body.

10. A compressor oil-gas separator according to any one of claims 1 to 9, characterized in that The second section is in the shape of a curved tube.

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