Cover plate, rotor assembly and compressor

Abstract

This utility model provides a cover plate, a rotor assembly, and a compressor. The cover plate is used in a compressor, which includes a rotor core. The cover plate is disposed on at least one end face of the rotor core. The cover plate includes: an end plate, which has an annular structure; and an oil baffle plate disposed on one side of the annular structure. The oil baffle plate includes a side wall and a top plate. The side wall extends outward in a direction away from the annular structure and has an opening. The top plate is disposed on the side of the side wall away from the end plate. The cover plate provided by this utility model includes an end plate and an oil baffle plate. The end plate is used to block the magnet inside the rotor core, and the oil baffle plate is used to prevent the refrigerant-carried refrigerant oil from being discharged outside the compressor. By reasonably setting the distance between the end plate and the oil baffle plate, the compressor can have a good oil-blocking effect. At the same time, there is a better gas flow area between the rotor and the oil baffle plate, and the gas flow area is not affected by the height change of the balance block on the rotor assembly, thus improving the working efficiency of the compressor.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, specifically to a cover plate, rotor assembly and compressor. Background Technology

[0002] The rotor used in existing rotary compressors includes a rotor core, magnets mounted on the rotor core, end plates, and balance blocks. During rotor assembly, the magnets are first inserted into the magnet slots of the rotor core; then, end plates are placed at both ends of the rotor core to prevent the magnets from falling out; next, balance blocks are placed on the upper and lower end faces of the rotor core to balance the rotor's imbalance and ensure smooth operation. During compressor operation, the high-speed rotation causes the refrigerant to move at high speed, carrying some refrigeration oil to the vicinity of the discharge pipe and then out of the compressor. This can cause problems such as insufficient oil in the compressor body and increased wear. Therefore, an oil baffle plate needs to be installed on the upper part of the rotor (i.e., above the balance blocks) to reduce the oil leakage rate.

[0003] However, this structure, intended to reduce the oil output rate of the compressor, results in higher compressor costs. Furthermore, because the end plate, oil baffle, and balance block are either separately configured or the balance block is integrated with the oil baffle, changes in the eccentric rotor mass lead to changes in the height of the balance block (i.e., changes in the height of the end plate and oil baffle). This alters the rotor's fluid flow area, preventing it from reaching its optimal value. Additionally, a higher balance block height reduces the effectiveness of the oil baffle in reducing the oil output rate. Therefore, the current rotor structure cannot simultaneously optimize fluid flow and oil baffle performance, thus impacting compressor efficiency. Utility Model Content

[0004] In view of the problems in the prior art, the purpose of this utility model is to provide a cover plate, rotor assembly and compressor that can simultaneously optimize the fluid flow and oil blocking effect of the compressor, thereby improving the working efficiency of the compressor.

[0005] This utility model embodiment provides a cover plate for use in a compressor, the compressor including a rotor core, the cover plate being disposed on at least one end face of the rotor core, the cover plate comprising:

[0006] End plate, wherein the end plate is a ring structure;

[0007] An oil baffle is provided on one side of the annular structure; the oil baffle includes a side wall and a top plate, the side wall extends outward in a direction away from the annular structure, the side wall has an opening, and the top plate is provided on the side of the side wall away from the end plate.

[0008] In some embodiments, the rotor core is provided with a flow hole, the area of ​​which is S1; the outer diameter of the end plate is R, and the lines connecting the two ends of the opening to the axis of the side wall form an included angle α; the displacement of the compressor is V; the compressor further includes a stator, the flow area between the stator and the rotor core and the flow area of ​​the stator are S2; the distance between the top plate and the end plate is h, where h satisfies:

[0009] V*S1 / (17.87*(S1+S2)*α*R)≤h≤V*S1 / (5.95*(S1+S2)*α*R).

[0010] In some embodiments, the compressor has a displacement of 21.5cc, and h satisfies: 4.41mm≤h≤13.2mm.

[0011] In some embodiments, the compressor has a displacement of 15cc, and h satisfies: 6.98mm≤h≤20.93mm.

[0012] In some embodiments, the end plate and the oil baffle are integrally formed.

[0013] In some embodiments, the top plate has a through hole at its center.

[0014] This utility model embodiment also provides a rotor assembly, including: a rotor core and a cover plate as described above, the cover plate being disposed on at least one end face of the rotor core.

[0015] In some embodiments, the cover plate includes a first cover plate and a second cover plate; the rotor assembly further includes a first balance block and a second balance block, the first cover plate is disposed on a first end face of the rotor core, the first balance block is disposed on a side of the first end plate of the first cover plate away from the rotor core; the second cover plate is disposed on a second end face of the rotor core, the second balance block is disposed on a side of the second end plate of the second cover plate away from the rotor core.

[0016] In some embodiments, rivets are also included, and the first balance block, the end plate, the rotor core, the second end plate, and the second balance block are fixedly connected by the rivets.

[0017] This utility model embodiment also provides a compressor, characterized in that it includes the rotor assembly described above.

[0018] The cover plate, rotor assembly, and compressor provided by this utility model have the following advantages:

[0019] The cover plate provided by this utility model includes an end plate and an oil baffle plate. The end plate is used to block the magnet inside the rotor core, and the oil baffle plate is used to prevent the refrigerant-carried refrigeration oil from being discharged from the compressor. By reasonably setting the distance between the end plate and the oil baffle plate, the compressor can have a good oil-blocking effect. At the same time, there is a better gas flow area between the rotor and the oil baffle plate, and the gas flow area is not affected by the height change of the balance block on the rotor assembly, thereby improving the working efficiency of the compressor. Attached Figure Description

[0020] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0021] Figure 1 A perspective view of a cover plate provided in an embodiment of the present invention is shown;

[0022] Figure 2 A side view of a cover plate provided in one embodiment of the present invention is shown;

[0023] Figure 3 A perspective view of a cover plate provided in another embodiment of the present invention is shown;

[0024] Figure 4 A top view of a rotor assembly provided in an embodiment of the present invention is shown.

[0025] Figure label:

[0026] 10 Cover plate 122 Top plate

[0027] 11 End plate 1221 Through hole

[0028] 111 Rivet holes 20 Rotor core

[0029] 12 Oil baffle plate 21 Flow hole

[0030] 121 Sidewall 30 Balance weight

[0031] 1211 Opening 40 Crankshaft Detailed Implementation

[0032] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0033] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this application, as well as features of different embodiments or examples.

[0034] Furthermore, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] It should be further understood that the terms "comprising" or "including" indicate the presence of a feature, step, operation, element, component, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" as used herein are interpreted as inclusive, or mean any one or any combination thereof. Therefore, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B, and C." Exceptions to this definition only arise when a combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0036] In existing technology, the rotor core has an end plate, a balance block, and an oil baffle plate at its end. The balance block is located between the end plate and the oil baffle plate. Therefore, adjusting the height of the balance block affects the height between the oil baffle plate and the rotor core. When the balance block is raised, the distance between the oil baffle plate and the rotor core increases, which reduces the oil-blocking effect and increases the flow area between the rotor core and the oil baffle plate. When the oil baffle plate's oil-blocking effect is poor, the compressor's oil output rate will be high, increasing wear during compressor operation and affecting the compressor's efficiency and stability. When the balance block is lowered, the distance between the oil baffle plate and the rotor core decreases, which improves the oil-blocking effect and reduces the flow area between the rotor core and the oil baffle plate. When the flow area between the rotor core and the oil baffle plate decreases, the gas velocity increases, leading to increased flow resistance and reduced compressor efficiency. Currently, the design of the end plate, balance block, and oil baffle plate cannot simultaneously optimize both oil blocking and gas flow, thus affecting the compressor's efficiency.

[0037] To address the aforementioned problem, this utility model provides a cover plate for use in a compressor. The compressor includes a rotor core, and the cover plate is disposed on at least one end face of the rotor core. The cover plate includes: an end plate, the first end plate being an annular structure; and an oil baffle plate disposed on one side of the annular structure. The oil baffle plate includes a side wall and a top plate. The side wall extends outward in a direction away from the annular structure and has an opening. The top plate is disposed on the side of the side wall away from the first end plate.

[0038] The cover plate provided by this utility model includes an end plate and an oil baffle plate. The end plate is used to block the magnet inside the rotor core, and the oil baffle plate is used to prevent the refrigerant-carried refrigeration oil from being discharged outside the compressor. By reasonably setting the distance between the end plate and the oil baffle plate, the compressor can have a good oil-blocking effect. At the same time, there is a better gas flow area between the rotor and the oil baffle plate, and the gas flow area is not affected by the height change of the balance block on the rotor assembly.

[0039] Furthermore, this embodiment of the invention also provides a rotor assembly, including: a rotor core and a cover plate as described above, the cover plate being disposed on at least one end face of the rotor core. This rotor assembly achieves all the technical effects of the cover plate described above, which can be specifically referred to in the technical effects of the cover plate described above, and will not be repeated here.

[0040] Furthermore, this embodiment of the invention also provides a compressor, including the rotor assembly described above. This compressor achieves all the technical effects of the rotor assembly described above; for details, please refer to the technical effects of the rotor assembly described above, which will not be repeated here.

[0041] The cover plate, rotor assembly, and compressor provided by this utility model will be explained in detail below with reference to specific embodiments.

[0042] Figure 1 A perspective view of a cover plate provided in an embodiment of the present invention is shown; Figure 2 A side view of a cover plate provided in one embodiment of the present invention is shown; Figure 3 A perspective view of a cover plate provided in another embodiment of the present invention is shown; Figure 4 A top view of a rotor assembly provided according to an embodiment of the present invention is shown. Figures 1 to 4 As shown, the cover plate 10 includes an end plate 11 and an oil baffle plate 12. The end plate 11 has an annular structure; the oil baffle plate 12 is located on one side of the annular structure and includes a side wall 121 and a top plate 122. The side wall 121 extends outward in a direction away from the annular structure and has an opening 1211. The top plate 122 is located on the side of the side wall 121 away from the end plate 11.

[0043] End plate 11 is used to block the permanent magnet installed in the magnet slot of the rotor core, so as to prevent the permanent magnet from falling out of the magnet slot of the rotor core; oil baffle 12 is used to block the refrigeration oil from being discharged out of the compressor along with the compressed refrigerant, thereby reducing the oil output rate of the compressor.

[0044] Furthermore, such as Figure 4 As shown, cover plate 10 is applied to a rotor assembly, which also includes a rotor core 20. Cover plate 10 is located at one end of rotor core 20. Rotor core 20 has flow holes 21 with a total area of ​​S1. The outer diameter of end plate 11 is R, and the lines connecting the two ends of opening 1211 to the axis of side wall 121 form an included angle α. When cover plate 10 is applied to a corresponding compressor, the compressor displacement is V. The compressor also includes a stator, and the flow area between the stator and rotor core 20, as well as the flow area of ​​the stator, is S2. The distance between top plate 122 and end plate 11 (in the thickness direction z) is h, which satisfies:

[0045] V*S1 / (17.87*(S1+S2)*α*R)≤h≤V*S1 / (5.95*(S1+S2)*α*R).

[0046] The displacement V of a rotary compressor is the product of the volume swept by the piston movement in the cylinder and the rotational speed. It is a known formula and can be found in existing technology. It will not be elaborated here.

[0047] By limiting the distance h between the middle end plate 11 and the top plate 122 of the cover plate 10, the compressor displacement V, the included angle α, the flow area S1 of the rotor, and the flow area S2 of the stator, the compressor has both good flow effect and good oil blocking effect, thereby improving the efficiency of the compressor.

[0048] Furthermore, based on the above formula, the required height h for compressors of different displacements is calculated. Table 1 shows the parameter values ​​for the three compressor displacements and the corresponding h values.

[0049] Table 1. Parameter values ​​and corresponding h values ​​for compressors of three different displacements.

[0050] Parameter value unit Compressor 1 Compressor 2 Compressor 3 V cc 21.5 9.8 15 S1 mm^2 106.32 106.32 318.96 S2 mm^2 553 553 553 α radian 1.57 1.57 1.57 R mm 56 56 56 hmin mm 4.41 2.01 6.98 hmax mm 13.2 6.03 20.93

[0051] According to Table 1 above, when compressor 1 has a displacement of 21.5cc and is a single-cylinder compressor, the required h range is 4.41mm to 13.2mm; when compressor 2 has a displacement of 9.8cc and is a double-cylinder compressor, the required h range is 2.01mm to 6.03mm; when compressor 3 has a displacement of 15cc, the required h range is 6.98mm to 20.93mm.

[0052] According to the prior art, the oil baffle of the compressor 1 is set at a height h of 15mm to 17mm from the end plate. Compared with the compressor 1 provided in this utility model embodiment, the height between the oil baffle and the end plate of the prior art compressor 1 is too large, which will cause gas backflow problem and thus affect the exhaust efficiency of the compressor 1.

[0053] According to the prior art, the oil baffle of the compressor 3 is set at a height h of 5mm to 6mm from the end plate. Compared with the compressor 3 provided in this utility model embodiment, the height between the oil baffle and the end plate of the prior art compressor 3 is smaller, which will cause the resistance during exhaust to increase, thereby reducing the exhaust efficiency of the compressor.

[0054] Therefore, compared with the compressors in the prior art, the compressor oil baffle provided in this embodiment is adapted to its displacement by a height that matches the end plate, resulting in better exhaust efficiency.

[0055] When the cover plate 10 provided in this embodiment of the present invention is applied to the rotor core 20, it can be set on the first end face of the rotor core 20, or on the second end face of the rotor core 20, or on both end faces, depending on the actual situation of the compressor.

[0056] Furthermore, the end plate 11 and the oil baffle 12 are integrally formed. For example, the cover plate 10 is formed using a stamping process. The end plate 11 and the oil baffle 12 are integrally formed to form the cover plate 10, which is a simple and low-cost process. However, the process for forming the cover plate 10 is not limited to this and can be set according to actual needs.

[0057] Furthermore, such as Figure 3 As shown, in some embodiments, the top plate 122 has a through hole 1221 at its center. The through hole 1221 allows a rotating shaft passing through the center of the rotor core 20 to pass through. When the cover plate 10 is only provided on the end face of the rotor core near the pump body assembly, the top plate 122 of the cover plate 10 must have a through hole 1221 so that the rotating shaft passing through the rotor core 20 can pass through. Figure 4 As shown, the rotating shaft is further connected to the crankshaft 40 of the pump body assembly to drive the crankshaft 40 to rotate. It should be noted that the cover plate 10, located on the end face of the rotor core 20 facing away from the pump body assembly, may or may not have a through hole 1221 in its center; the specific configuration depends on actual requirements. It should also be noted that when the cover plate 10 is only located on one end face of the rotor core 20, an annular structure with the same shape as the end plate must be provided on the other end face of the rotor core 20 to prevent the magnet from detaching from the magnet slot at the other end of the rotor core 20.

[0058] Furthermore, the end plate 11 has a plurality of rivet holes 111 distributed axially. When assembling the various components of the rotor assembly, the rivets pass through these rivet holes 111 to fix the cover plate 10 to the end face of the rotor core 20.

[0059] Furthermore, in some embodiments, the rotor assembly includes a first cover plate, a second cover plate, a first balance block, and a second balance block. The first cover plate is disposed on a first end face of the rotor core, and the first balance block is disposed on the side of the first end plate of the first cover plate away from the rotor core. The second cover plate is disposed on a second end face of the rotor core, and the second balance block is disposed on the side of the second end plate of the second cover plate away from the rotor core.

[0060] Furthermore, the rotor assembly also includes rivets. When assembling the rotor assembly, the first balance block, the first cover plate, the rotor core, the second cover plate, and the second balance block are fixedly connected by rivets to complete the assembly of the rotor assembly.

[0061] like Figure 4 As shown in the figure, this embodiment of the present invention illustrates a balance block 30 disposed at one end (on the XY plane) of the rotor assembly.

[0062] The design principle of the balance block 30 is the balance of forces and torques. When designing the balance block 30, the distance from its center of mass to the center of the crankshaft 40 is denoted as S. For a given pump assembly design, the product of S and the mass m of the balance block 30 is a constant. When the distance S from the center of mass of the balance block 30 to the center of the crankshaft 40 is small, the corresponding mass m of the balance block 30 is large. However, the design of the cover plate 10 in this invention can increase the distance S from the center of mass of the balance block 30 to the center of the crankshaft, thus correspondingly reducing the mass m of the balance block 30, reducing the amount of material used in the balance block 30, and consequently lowering the cost of the balance block.

[0063] In summary, the cover plate, rotor assembly, and compressor provided by this utility model have the following advantages:

[0064] The cover plate provided by this utility model includes an end plate and an oil baffle plate. The end plate is used to block the magnet inside the rotor core, and the oil baffle plate is used to prevent the refrigerant-carried refrigeration oil from being discharged outside the compressor. By reasonably setting the distance between the end plate and the oil baffle plate, the compressor can have a good oil-blocking effect. At the same time, there is a better gas flow area between the rotor and the oil baffle plate, and it is not affected by the height change of the balance block on the rotor assembly.

[0065] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications or substitutions should be considered within the protection scope of the present invention.

Claims

1. A cover plate, characterized in that, Used in a compressor, the compressor includes a rotor core, and a cover plate is disposed on at least one end face of the rotor core, the cover plate comprising: End plate, wherein the end plate is a ring structure; An oil baffle is provided on one side of the annular structure; the oil baffle includes a side wall and a top plate, the side wall extends outward in a direction away from the annular structure, the side wall is provided with an opening, and the top plate is provided on the side of the side wall away from the end plate; The rotor core has a flow hole with an area of ​​S1; the outer diameter of the end plate is R, and the lines connecting the two ends of the opening to the axis of the side wall form an included angle α; the compressor has a displacement of V; the compressor also includes a stator, the flow area between the stator and the rotor core and the flow area of ​​the stator are S2; the distance between the top plate and the end plate is h, where h satisfies: V S1 / (17.87 (S1+S2) α R)≤h≤V S1 / (5.95 (S1+S2) α R).

2. The cover plate according to claim 1, characterized in that, The compressor has a displacement of 21.5cc, and h satisfies the following condition: 4.41mm≤h≤13.2mm.

3. The cover plate according to claim 1, characterized in that, The compressor has a displacement of 15cc, and h satisfies the following condition: 6.98mm≤h≤20.93mm.

4. The cover plate according to claim 1, characterized in that, The end plate and the oil baffle are integrally formed.

5. The cover plate according to claim 1, characterized in that, The top plate has a through hole in the center.

6. A rotor assembly, characterized in that, include: The rotor core and the cover plate as described in any one of claims 1 to 5, the cover plate being disposed on at least one end face of the rotor core.

7. The rotor assembly according to claim 6, characterized in that, The cover plate includes a first cover plate and a second cover plate. The rotor assembly also includes a first balance block and a second balance block. The first cover plate is disposed on the first end face of the rotor core, and the first balance block is disposed on the side of the first end plate of the first cover plate away from the rotor core. The second cover plate is disposed on the second end face of the rotor core, and the second balance block is disposed on the side of the second end plate of the second cover plate away from the rotor core.

8. The rotor assembly according to claim 7, characterized in that, It also includes rivets, and the first balance block, the first cover plate, the rotor core, the second cover plate and the second balance block are fixedly connected by the rivets.

9. A compressor, characterized in that, Includes the rotor assembly as described in any one of claims 6 to 8.

Images