Oil baffle plate assembly, rotor assembly and compressor

Abstract

The invention relates to the field of compressors, in particular to an oil baffle assembly, a rotor assembly and a compressor, and aims to solve the problem that an oil-gas separation baffle of an existing compressor is poor in oil-gas separation effect. In order to achieve the purpose, the oil baffle plate assembly comprises a first-stage oil baffle plate, the side, facing a rotor iron core, of the first-stage oil baffle plate is provided with a turned-over edge, a first balance block and a plurality of supporting columns, the turned-over edge is used for containing the end of a crankshaft, the first balance block and the supporting columns are provided with mounting holes, and the first-stage oil baffle plate is connected with the rotor iron core through connecting pieces via the mounting holes; and the second-stage oil baffle plate is arranged on one side, far away from the rotor iron core, of the first-stage oil baffle plate. According to the oil baffle assembly, the radial and axial covering space of a rotating flow field is enlarged, refrigerant oil dissolved in gas can be separated out in a large proportion and flows back to a compressor oil pool, and the oil-gas separation effect of the oil-gas separation baffle is improved.

Description

Technical Field

[0001] This invention relates to the field of compressors, and specifically provides an oil baffle assembly, a rotor assembly, and a compressor. Background Technology

[0002] Refrigeration oil plays a role in lubrication, cooling, and sealing in compressors. During compressor operation, if a large amount of refrigeration oil is discharged from the compressor discharge pipe along with the refrigerant, it will enter the condenser, evaporator, and system piping. This will cause an oil film to condense on the heat transfer surfaces of the condenser and evaporator. This oil film has a low thermal conductivity, reducing the heat exchange efficiency of the condenser and evaporator. Particularly when the compressor discharges excessive oil, this portion of refrigeration oil cannot return to the compressor oil sump in time, resulting in a low oil level. This compromises the lubrication and sealing of the moving parts and mating surfaces of the pump components, thus affecting the reliability and performance of the compressor.

[0003] One of the existing conventional technical solutions for reducing compressor oil discharge is to install only one level of oil baffles on the upper end of the rotor. During compressor operation, this level of oil baffles generates a layer of rotating flow field space on the upper end of the rotor. The space covered by this rotating flow field in the radial and axial directions of the compressor is small, resulting in limited centrifugal effect, which cannot effectively separate the refrigerant oil dissolved in the gas in a large proportion.

[0004] For example, Chinese patent application CN101769257 B discloses an oil-gas separation baffle for an air conditioning compressor. The baffle is located at the upper end of the rotor and includes a circular plate and several blades evenly distributed around the edge of the plate. The surface of the circular plate has several riveting holes for riveting to the rotor. The blades are C-shaped thin plates, with their lower parts fixed to the edge of the circular plate perpendicular to its surface, and their upper parts extending radially outward at an acute angle α to their lower parts. When the rotor rotates at high speed, the blades of the oil-gas separation baffle generate a strong centrifugal force, causing oil droplets to be thrown towards the casing, collect, and fall, thereby achieving the purpose of separating them from the refrigerant and lubricating oil mixture. However, the rotating flow field formed by the oil-gas separation baffle in this application covers a relatively small space along the radial and circumferential directions of the compressor, resulting in a small proportion of refrigerant oil being separated from the gas. Furthermore, the excessive distance between the blades further weakens the oil-gas separation effect.

[0005] Accordingly, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0006] The present invention aims to solve the aforementioned technical problem, namely, the poor oil-gas separation effect of existing compressor oil-gas separator baffles. To this end, the present invention provides an oil baffle assembly, comprising: a primary oil baffle, wherein the primary oil baffle has a flange, a first balance block, and several supports on the side facing the rotor core; the flange is used to accommodate the end of the crankshaft; the first balance block and the supports are provided with mounting holes; and a connector connects the primary oil baffle to the rotor core through the mounting holes; and a secondary oil baffle, wherein the secondary oil baffle is disposed on the side of the primary oil baffle away from the rotor core.

[0007] In the specific embodiment of the above-mentioned oil baffle assembly, the secondary oil baffle includes: an axial oil baffle that extends axially; and an outwardly expanding oil baffle, the two ends of which are respectively connected to the primary oil baffle and the outwardly expanding oil baffle, the outwardly expanding oil baffle extending radially outward at an acute angle θ with the axial oil baffle.

[0008] In the specific embodiment of the above-mentioned oil baffle assembly, the outwardly expanding oil baffle and the axial oil baffle form an acute angle θ, wherein 10°≤θ≤30°.

[0009] In the specific embodiment of the above-described oil baffle assembly, the outer diameter of the outwardly expanding oil baffle is smaller than the diameter of the circle in which the support is located.

[0010] In the specific embodiment of the above-mentioned oil baffle assembly, the axial height of the oil baffle along the axial direction is H1, wherein 8mm≤H1≤15mm; and / or the axial height of the outwardly extended oil baffle is H2, wherein 5mm≤H2≤15mm.

[0011] In the specific embodiment of the above-mentioned oil baffle assembly, the inner diameter of the flange is D1, and the inner diameter of the axial oil baffle is D3, wherein D3-D1≥5mm.

[0012] In the specific embodiment of the above-described oil baffle assembly, the secondary oil baffle is provided with a baffle groove extending axially.

[0013] In the specific embodiment of the above-mentioned oil baffle assembly, the radial width of the baffle groove is H3, wherein 1.5mm≤H3≤3mm.

[0014] A rotor assembly includes a rotor core and a second balance block, and further includes an oil baffle assembly as described in any one of the preceding claims, wherein the second balance block and the oil baffle assembly are respectively disposed on both sides of the rotor core.

[0015] A compressor includes a housing, a stator disposed within the housing, a rotor assembly rotating within the stator, and a crankshaft disposed at the center of the rotor assembly, wherein the rotor assembly is the aforementioned rotor assembly.

[0016] When adopting the above technical solution, the rotation of the primary oil baffle, flange, first balance block, and several pillars in this invention forms a rotating flow field, which performs the first separation of the refrigeration oil dissolved in the gas. The rotation of the secondary oil baffle forms a second rotating flow field, which further separates the unseparated refrigeration oil. The two separations increase the probability of refrigeration oil separation. In addition, the primary oil baffle increases the coverage space of the rotating flow field radially, and the secondary oil baffle increases the coverage space of the second rotating flow field axially based on the primary oil baffle 1. Since the double-layer rotating flow field has a larger radial and axial space, the centrifugal force generated is also greater, which can more effectively separate the refrigeration oil in the gas. Moreover, the double-layer rotating flow field comes into contact with more gas, enabling the separation of refrigeration oil from more gas and improving the oil-gas separation effect of the oil-gas separation baffle. Attached Figure Description

[0017] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0018] Figure 1 This is a schematic diagram of the compressor in this invention, showing the flow direction of the refrigerant oil;

[0019] Figure 2 This is a schematic diagram of the rotor assembly in this invention;

[0020] Figure 3 This is a schematic diagram of the oil baffle assembly in this invention;

[0021] Figure 4 This is a bottom view of the oil baffle assembly in this invention;

[0022] Figure 5 yes Figure 4 Sectional view at point AA.

[0023] In the diagram: 1. Primary oil baffle, 11. Flanged edge, 12. First balance block, 13. Support column, 14. Mounting hole, 2. Secondary oil baffle, 21. Axial oil baffle, 22. Outwardly expanded oil baffle, 23. Baffle groove, 3. Rotor core, 4. Second balance block, 5. Housing, 6. Stator, 7. Crankshaft, 8. Connecting parts, 91. Exhaust pipe, 92. Compressor oil sump, 93. Liquid separator, 94. Pump body assembly. Detailed Implementation

[0024] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0025] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the relevant devices or elements must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] Furthermore, in order to more clearly demonstrate the core technical solution of the present invention, the description of the known structure of the compressor is omitted in the following description. However, this omission is only for the convenience of description and does not mean that the compressor can be without these structures.

[0028] like Figure 1 As shown, the present invention proposes a compressor, including a housing 5, a stator 6 disposed within the housing 5, a rotor assembly rotating within the stator 6, and a crankshaft 7 disposed at the center of the rotor assembly. It also includes an exhaust pipe 91 disposed on the housing 5, a compressor oil sump 92 disposed at the bottom of the housing 5, a distributor 93 disposed on one side of the housing 5, and a pump assembly 94 disposed below the crankshaft 7.

[0029] like Figure 1-2 As shown, the present invention proposes a rotor assembly, including a rotor core 3 and a second balance block 4, and also includes an oil baffle assembly, wherein the second balance block 4 and the oil baffle assembly are respectively disposed on both sides of the rotor core 3.

[0030] like Figure 3-5 As shown, the present invention proposes an oil baffle assembly, comprising: a primary oil baffle 1, wherein the primary oil baffle 1 is provided with a flange 11, a first balance block 12 and several supports 13 on the side of the primary oil baffle 1 facing the rotor core 3, the flange 11 is used to accommodate the end of the crankshaft 7, the first balance block 12 and the supports 13 are provided with mounting holes 14, and the connector 8 connects the primary oil baffle 1 to the rotor core 3 through the mounting holes 14; and a secondary oil baffle 2, wherein the secondary oil baffle 2 is disposed on the side of the primary oil baffle 1 away from the rotor core 3.

[0031] In this embodiment, to address the poor oil-gas separation effect of existing compressor oil-gas separators, a two-stage oil baffle is configured to form two layers of rotating flow fields. The rotation of the first-stage oil baffle 1, the flange 11, the first balance block 12, and several support pillars 13 forms one layer of rotating flow field, which performs the first separation of the refrigerant oil dissolved in the gas. The rotation of the second-stage oil baffle 2 forms a second layer of rotating flow field, which further separates the remaining refrigerant oil. This double separation increases the probability of refrigerant oil separation. Furthermore, the first-stage oil baffle 1 radially increases the coverage space of the first layer of rotating flow field, and the second-stage oil baffle 2 axially increases the coverage space of the second layer of rotating flow field based on the first-stage oil baffle 1. Because the double-layer rotating flow field has a larger radial and axial space, the centrifugal force generated is also greater, which can more effectively separate the refrigerant oil in the gas. Moreover, the double-layer rotating flow field comes into contact with more gas, enabling the separation of refrigerant oil from more gas. The separated refrigerant oil flows into the compressor oil sump 92 along the inner wall of the housing 5.

[0032] In this embodiment, the oil baffle assembly increases the radial and axial coverage space of the rotating flow field, which can separate the refrigerant oil dissolved in the gas at a larger proportion and let it flow back into the compressor oil sump 92, thereby improving the oil-gas separation effect of the oil-gas separation baffle and minimizing the amount of oil flowing into the condenser, evaporator and system pipeline.

[0033] In order for the first-stage oil baffle 1 to be installed flat on the surface of the rotor core 3, the lower edge of the flange 11, the lower edge of the first balance block 12 and the lower edge of the support column 13 are kept flush.

[0034] The outer diameter of the rotor core 3 is d, and the outer diameter of the first-stage oil baffle 1 is D2. In order to avoid interference between the first-stage oil baffle 1 and other components of the compressor, D2 is usually set to be slightly smaller than d, for example, 0 < d - D2 < 2 mm.

[0035] It should be pointed out that, although Figure 3 The cross-section of the flange 11 shown is circular, but this is not a limitation of the present invention. Without departing from the basic principles of the present invention, those skilled in the art can use flanges of other shapes, such as flanges with a quincunx cross-section, etc. These do not depart from the principles of the present invention and therefore fall within the protection scope of the present invention.

[0036] Furthermore, to increase the coverage space of the second-layer rotating flow field generated by the rotation of the secondary oil baffle 2, the secondary oil baffle 2 includes: an axial oil baffle 21 extending axially; and an outwardly expanding oil baffle 22, the two ends of which are connected to the primary oil baffle 1 and the outwardly expanding oil baffle 22 respectively. The outwardly expanding oil baffle 22 extends radially outward at an acute angle θ with the axial oil baffle 21. The cross-section of the axial oil baffle 21 is annular, and the cross-section of the outwardly expanding oil baffle 22 is also annular.

[0037] In this embodiment, the axial baffle 21 further increases the axial height of the baffle assembly, resulting in a larger axial coverage space for the two-layer rotating flow field. The outwardly extending baffle 22 extends radially outward at an acute angle θ with the axial baffle 21, which increases both the axial and radial coverage space of the two-layer rotating flow field. The larger the coverage space of the two-layer rotating flow field, the greater the centrifugal effect and the better the oil-gas separation effect. The rotating flow field generated by the outwardly extending baffle 22 is frustum-shaped, relatively stable, and the effect of this rotating flow field on gas separation is relatively uniform.

[0038] Furthermore, such as Figure 5 As shown, the outwardly expanding oil baffle 22 and the axial oil baffle 21 form an acute angle θ, where 10°≤θ≤30°. In this embodiment, although increasing the height of the oil baffle assembly can increase the coverage space of the rotating flow field, thereby increasing the separation ratio of refrigerant oil, an excessively high oil baffle assembly may interfere with other components inside the compressor, affecting the normal operation of the compressor, and may also prevent the coolant from flowing down the inner wall of the housing 5 into the compressor oil sump 92 in a timely manner. Therefore, it is necessary to limit the height and radial width of the secondary oil baffle 2. If the angle θ is too small, the radial width of the secondary oil baffle 2 will be small, resulting in a small radial coverage space of the rotating flow field and an unsatisfactory oil-gas separation effect; if the angle θ is too large, the radial width of the secondary oil baffle 2 will be too large, and the radial coverage range of the generated rotating flow field will also be too large, resulting in a greater pressure below the separated refrigerant oil than above, which in turn prevents the separated refrigerant oil from flowing down the inner wall of the housing 5 into the compressor oil sump 92 in a timely manner. When 10°≤θ≤30°, the height and radial width of the secondary oil baffle 2 are more suitable.

[0039] like Figure 3 As shown, the primary oil baffle 1 has two supports 13, each support 13 having one mounting hole 14. The first balance block 12 has two mounting holes 14, which are rivet holes, and the connectors 8 are rivets. The rotor core 3 has connecting holes corresponding to the four mounting holes 14, and the second balance block 4 has mounting holes corresponding to the mounting holes 14 on the two supports 13. During installation, the two connectors 8 pass through the mounting holes 14 on the supports 13, through the connecting holes, and through the mounting holes 14 on the second balance block 4, connecting the supports 13 to the rotor core 3 and the second balance block 4. The two connectors 8 also pass through the two mounting holes 14 on the first balance block 12 and the corresponding connecting holes on the rotor core 3, connecting the first balance block 12 to the rotor core 3.

[0040] like Figure 5As shown, to avoid the radial dimension of the extended oil baffle 22 being too large and affecting the installation of the connector 8, the outer diameter of the extended oil baffle 22 is smaller than the diameter of the circle containing the support column 13. The outer diameter of the extended oil baffle 22 is largest at its highest point along the axial direction, and the maximum outer diameter of the extended oil baffle 22 is D5. The diameter of the circle containing the support column 13 is D4, where D4-D5>4mm.

[0041] It should be pointed out that, although Figure 3 The diagram shows four mounting holes, but this is not a limitation of the invention. Those skilled in the art can use other numbers of mounting holes without departing from the basic principles of the invention, as long as the primary oil baffle 1 can be connected to the rotor core 3 and the two balance blocks 4 without affecting the rotor's balance. For example, two mounting holes 14 can be provided on the first balance block 12, and a support column 13 can be provided on the primary oil baffle 1; or, one mounting hole 14 can be provided on the first balance block 12, and two support columns 13 can be provided on the primary oil baffle 1, etc. These all do not depart from the principles of the invention and therefore fall within the scope of protection of the invention.

[0042] Furthermore, the axial height of the axial baffle 21 is H1, where 8mm≤H1≤15mm; the axial height of the outwardly expanding baffle 22 is H2, where 5mm≤H2≤15mm.

[0043] Furthermore, the inner diameter of the flange 11 is D1, and the inner diameter of the axial oil baffle 21 is D3. Since the flange 11 has a through hole for accommodating the crankshaft 7, the inner diameter D3 of the axial oil baffle 21 must be greater than the inner diameter D1 of the flange 11, which can be: D3-D1≥5mm.

[0044] Furthermore, such as Figure 3 As shown, the secondary oil baffle 2 is provided with a baffle groove 23 extending axially. During compressor shutdown or operation, a very small amount of refrigerant oil falls into the secondary oil baffle 2. If the secondary oil baffle 2 has no circumferential opening, the amount of refrigerant oil in the secondary oil baffle 2 will increase, and this portion of refrigerant oil cannot flow into the compressor oil sump 92. In order to allow this portion of refrigerant oil to flow out of the secondary oil baffle 2, a baffle groove 23 extending axially is provided on the secondary oil baffle 2. During compressor shutdown or operation, this portion of refrigerant oil is thrown out of the secondary oil baffle 2 through the baffle groove 23 by the centrifugal force of rotation, and flows along the inner wall of the housing 5 to the compressor oil sump 92.

[0045] In order to ensure that the small amount of refrigeration oil in the secondary oil baffle 2 can be thrown out, the baffle groove 23 extends downward along the axial direction to be flush with the primary oil baffle 1.

[0046] Furthermore, the radial width of the baffle groove 23 is H3, where 1.5mm≤H3≤3mm.

[0047] The function of the baffle groove 23 is to throw out a small amount of refrigeration oil in the secondary oil baffle 2. Therefore, it does not need to be too wide. If it is too wide, it will weaken the second-layer rotating flow field, resulting in a reduction in the oil-gas separation effect. Therefore, when the range of H is 1.5mm≤H1≤3mm, it can throw out a small amount of refrigeration oil in the secondary oil baffle 2 without weakening the second-layer rotating flow field.

[0048] In another embodiment, the secondary oil baffle 2 may also include only the extended oil baffle 22, which is disposed on the primary oil baffle 2 and forms a certain angle with the axis.

[0049] Those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments in the claims of this application can be used in any combination.

[0050] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. An oil baffle assembly, characterized in that, include: A primary oil baffle (1) is provided with a flange (11), a first balance block (12) and several supports (13) on the side of the primary oil baffle (1) facing the rotor core (3). The flange (11) is used to accommodate the end of the crankshaft (7). The first balance block (12) and the supports (13) are provided with mounting holes (14). The connector (8) connects the primary oil baffle (1) to the rotor core (3) through the mounting holes (14). Secondary oil baffle (2), which is disposed on the side of the primary oil baffle (1) away from the rotor core (3).

2. The oil baffle assembly according to claim 1, characterized in that, The secondary oil baffle (2) includes: An axial oil baffle (21) extends axially; The outwardly expanding oil baffle (22) is connected at both ends of the axial oil baffle (21) to the first-stage oil baffle (1) and the outwardly expanding oil baffle (22) respectively. The outwardly expanding oil baffle (22) extends radially outward in such a way that it forms an acute angle θ with the axial oil baffle (21).

3. The oil baffle assembly according to claim 2, characterized in that, The outwardly expanding oil baffle (22) and the axial oil baffle (21) form an acute angle θ, where 10°≤θ≤30°.

4. The oil baffle assembly according to claim 2, characterized in that, The outer diameter of the outwardly expanding oil baffle (22) is smaller than the diameter of the circle containing the support column (13).

5. The oil baffle assembly according to claim 2, characterized in that, The axial height of the oil baffle (21) is H1, wherein 8mm ≤ H1 ≤ 15mm; and / or The height of the outwardly expanded oil baffle (22) along the axial direction is H2, where 5mm≤H2≤15mm.

6. The oil baffle assembly according to claim 2, characterized in that, The inner diameter of the flange (11) is D1, and the inner diameter of the axial oil baffle (21) is D3, wherein D3-D1≥5mm.

7. The oil baffle assembly according to claim 1, characterized in that, The secondary oil baffle (2) is provided with a baffle groove (23) extending along the axial direction.

8. The oil baffle assembly according to claim 7, characterized in that, The radial width of the baffle groove (23) is H3, wherein 1.5mm≤H3≤3mm.

9. A rotor assembly, characterized in that, It includes a rotor core (3) and a second balance block (4), and also includes an oil baffle assembly according to any one of claims 1-8, wherein the second balance block (4) and the oil baffle assembly are respectively disposed on both sides of the rotor core (3).

10. A compressor comprising a housing (5), a stator (6) disposed within the housing (5), a rotor assembly rotating within the stator (6), and a crankshaft (7) disposed at the center of the rotor assembly, characterized in that, The rotor assembly is the rotor assembly described in claim 9.

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