Weight balancing device of liquid-cooled rotor, cooling system and motor

Abstract

The utility model belongs to the technical field of motors, and discloses a weight balancing device of a liquid-cooled rotor, which comprises a counterweight piece and a butt joint piece. The counterweight part is provided with a liquid inlet groove for inputting cooling liquid; the butt joint piece is provided with a liquid inlet hole and a liquid outlet hole, the liquid inlet hole is used for inputting the cooling liquid of the liquid inlet groove into the liquid cooling rotor, and the liquid outlet hole is used for outputting the cooling liquid from the liquid cooling rotor; and the axial projection area of the counterweight part is smaller than that of the butt joint part. The utility model also provides a cooling system and a motor comprising the balancing device of the liquid cooling rotor. According to the utility model, the connectivity of the cooling channel is ensured through the butt joint piece, so that the size of the counter weight piece can be reduced, and the smaller the size of the counter weight piece is, the fewer materials are needed, thereby reducing the material cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and particularly relates to a weight balancing device, a cooling system and a motor for a liquid-cooled rotor. Background Art

[0002] Uneven mass distribution of the motor rotor will cause uneven centrifugal force distribution, which in turn affects the motor performance. Usually, a balance disk is used to improve the mass distribution of the motor rotor: material removal is carried out on the balance disk corresponding to the area with larger mass of the motor rotor, or weight addition is carried out corresponding to the area with smaller mass of the motor rotor.

[0003] For a liquid-cooled rotor (a rotor cooled by a coolant, such as cooling oil), the balance disk not only needs to play a role in improving the mass distribution, but also needs to increase the liquid inlet hole and the liquid outlet hole to connect the coolant channels inside the liquid-cooled rotor. In order to ensure that the coolant channels on the liquid-cooled rotor can be docked, the diameter of the balance disk cannot be much smaller than the diameter of the liquid-cooled rotor, which results in a large size and high cost of the balance disk. Summary of the Utility Model

[0004] The utility model provides a balancing device for a liquid-cooled rotor, which can reduce the size and cost on the premise of ensuring connection with the cooling channels.

[0005] The utility model is realized by the following technical solutions: a weight balancing device for a liquid-cooled rotor, comprising:

[0006] A counterweight and a docking member;

[0007] The counterweight has a liquid inlet groove for inputting coolant;

[0008] The docking member has a liquid inlet hole and a liquid outlet hole. The liquid inlet hole is used to input the coolant in the liquid inlet groove into the liquid-cooled rotor, and the liquid outlet hole is used to output the coolant from the liquid-cooled rotor;

[0009] The axial projection area of the counterweight is smaller than the axial projection area of the docking member.

[0010] In the utility model, the liquid outlet hole is removed from the counterweight, and only the liquid inlet groove is provided. Then, the docking member is used to complete the docking with the liquid-cooled rotor to ensure the connectivity with the cooling channels. The size of the counterweight only needs to ensure that the liquid inlet groove can be connected with the liquid inlet hole on the docking member, and the size of the counterweight can be reduced to be smaller than the diameter of the liquid-cooled rotor.

[0011] Further, the counterweight has a shaft hole for interference fit connection with the motor shaft. The circumferential positioning and axial positioning are realized by the interference fit between the shaft hole of the counterweight and the motor shaft.

[0012] Further, the docking member has a through hole for passing through the motor rotating shaft. The docking member can be sleeved on the motor rotating shaft through the through hole.

[0013] Further, the docking member is coaxially and fixedly connected to the weight member as a whole, and the axis of the shaft hole coincides with the axis of the through hole. When the circumferential positioning and axial positioning of the weight member are completed, the circumferential positioning and axial positioning of the docking member are synchronously completed.

[0014] Further, the weight member has a shaft hole. One end of the liquid inlet groove is communicated with the shaft hole, and the other end extends radially. And when the weight member is coaxially docked with the docking member, the liquid inlet groove can extend to a position communicated with the liquid inlet hole.

[0015] After the shaft hole is connected to the motor rotating shaft, the coolant flowing out of the liquid outlet hole of the motor rotating shaft can be obtained at one end of the liquid inlet groove. Under the action of centrifugal force, the coolant flows to the other end of the liquid inlet groove. When the other end is communicated with the liquid inlet hole on the docking member, the coolant can be output to the liquid-cooled rotor.

[0016] Further, the docking member has a through hole, and the diameter of the through hole is not less than the diameter of the shaft hole. One end of the liquid inlet hole is communicated with the through hole, and the other end extends radially to form a slot hole, and the flow area of the slot hole is not less than the flow area of the liquid inlet groove.

[0017] The flow area of the slot hole is not less than the flow area of the liquid inlet groove, ensuring that the liquid inlet hole can obtain a larger flow rate from the liquid inlet groove.

[0018] Further, the liquid inlet holes and the liquid outlet holes are alternately distributed in the circumferential direction. The liquid inlet holes are equally spaced, and the liquid outlet holes are equally spaced. This ensures the circumferential symmetry relationship, thus meeting the function of balanced cooling to maintain the stability of the liquid-cooled rotor during operation.

[0019] Further, the weight member is annular, and the outer radius of the weight member satisfies the following relationship: R1 < R < R2, where R represents the outer radius of the weight member, R1 represents the maximum radial distance from the liquid inlet hole to the central axis of the docking member, and R2 represents the maximum radial distance from the liquid outlet hole to the central axis of the docking member.

[0020] The range of the outer radius of the weight member ensures that the liquid inlet groove has enough extension space to extend to the position where it is docked with the liquid inlet hole, and also avoids the weight member from being too large in size.

[0021] Further, the outer edge of the weight member is provided with lugs, and the lugs are provided with positioning holes for installation.

[0022] The lug is a local structure. Compared with increasing the counterweight to set the positioning hole by the overall size, the lug requires less additional material, which plays a role in reducing costs.

[0023] Furthermore, the docking part is made of a non-magnetic steel plate with a thickness of less than 4 mm. This reduces material costs and avoids electromagnetic interference to the motor.

[0024] The present utility model also provides a cooling system, which includes the weight balancing device of the liquid-cooled rotor of the present utility model, and also includes a motor rotating shaft and a liquid-cooled rotor; the weight balancing device of the liquid-cooled rotor is docked with the liquid-cooled rotor to form a coolant passage, and is sleeved on the motor rotating shaft.

[0025] Furthermore, the docking part is circular, and the outer diameter of the docking part is not greater than the outer diameter of the liquid-cooled rotor.

[0026] Through such a docking part, the liquid-cooled rotor can be well covered, and the tightness between the silicon steel sheets forming the liquid-cooled rotor can be maintained.

[0027] The present utility model also provides a motor, which includes the weight balancing device of the liquid-cooled rotor of the present utility model.

[0028] The present utility model ensures the connectivity of the cooling channel through the docking part, enabling the size of the counterweight to be reduced. The smaller the size of the counterweight, the less material is required, thereby reducing material costs. In addition, after the docking part and the counterweight are coaxially fixedly connected as a whole, the assembly efficiency of the shaft insertion process can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a structure of a docking part adopted in the specific embodiment of the present utility model;

[0031] Figure 2 It is a structure of a counterweight adopted in the specific embodiment of the present utility model;

[0032] Figure 3 It is another structure of a docking part adopted in the specific embodiment of the present utility model

[0033] Figure 4 It is an assembly structure adopted in the specific embodiment of the present utility model;

[0034] Figure 5 It is an exploded view of the cooling system of the specific embodiment of the present utility model. Specific embodiment

[0035] In the prior art, for a liquid-cooled rotor (a rotor cooled by a coolant, such as cooling oil), the balance disk not only needs to play a role in improving the mass distribution, but also needs to increase the liquid inlet hole and the liquid outlet hole to connect the coolant channels inside the liquid-cooled rotor. In order to ensure that the coolant channels on the liquid-cooled rotor can be docked, the diameter of the balance disk cannot be significantly smaller than the diameter of the liquid-cooled rotor, which results in a relatively large size of the balance disk and requires more materials (such as aluminum, stainless steel, etc.) for manufacturing, thus increasing the cost.

[0036] The present utility model provides a weight balancing device for a liquid-cooled rotor, comprising:

[0037] A weight member and a docking member;

[0038] The weight member has a liquid inlet groove for inputting a coolant;

[0039] The docking member has a liquid inlet hole and a liquid outlet hole. The liquid inlet hole is used to input the coolant in the liquid inlet groove into the liquid-cooled rotor, and the liquid outlet hole is used to output the coolant from the liquid-cooled rotor;

[0040] The axial projection area of the weight member is smaller than the axial projection area of the docking member.

[0041] In the present utility model, the liquid outlet hole is removed from the weight member, and only the liquid inlet groove is provided. Then, the docking member is used to complete the docking with the liquid-cooled rotor to ensure the connectivity with the cooling channel. The size of the weight member only needs to ensure that the liquid inlet groove can communicate with the liquid inlet hole on the docking member. Therefore, the size of the weight member only needs to be able to cover the docking area required by the liquid inlet hole, and the size of the weight member can be reduced to be significantly smaller than the diameter of the liquid-cooled rotor.

[0042] Embodiment 1

[0043] Reference Figure 1 As shown, in this embodiment, the docking member 1 is circular ring-shaped, and the outer diameter of the docking member is not greater than the outer diameter of the liquid-cooled rotor. Through such a docking member, the liquid-cooled rotor can be well covered, and the tightness between the silicon steel sheets constituting the liquid-cooled rotor can be maintained.

[0044] The liquid inlet hole 101 and the liquid outlet hole 102 are alternately distributed along the circumferential direction. The liquid inlet holes are equally spaced, and the liquid outlet holes are equally spaced. This ensures the circumferential symmetry relationship, thereby fulfilling the role of balanced cooling to maintain the stability of the liquid-cooled rotor during operation.

[0045] The counterweight is annular, and the outer radius of the counterweight satisfies the following relationship: R1 < R < R2, where R represents the outer radius of the counterweight, R1 represents the maximum radial distance from the liquid inlet hole to the central axis of the docking member, and R2 represents the maximum radial distance from the liquid outlet hole to the central axis of the docking member.

[0046] It should be noted that the maximum radial distance from the liquid inlet hole to the central axis of the docking member: The distance from a point on the circumference of the liquid inlet hole to the central axis of the docking member is the radial distance, and the maximum value among the radial distances is the maximum radial distance.

[0047] Similarly, the maximum radial distance from the liquid outlet hole to the central axis of the docking member: The distance from a point on the circumference of the liquid outlet hole to the central axis of the docking member is the radial distance, and the maximum value among the radial distances is the maximum radial distance.

[0048] Reference Figure 2 As shown, the counterweight 2 has a shaft hole 202. One end of the liquid inlet groove 201 is communicated with the shaft hole 202, and the other end extends radially. And when the counterweight 2 is coaxially docked with the docking member 1, the liquid inlet groove 201 can extend to a position communicated with the liquid inlet hole 101.

[0049] In this embodiment, both the liquid inlet hole 101 and the liquid outlet hole 102 are circular. Of course, they can also be of any other shape. The shape of the liquid inlet hole is different from that of the liquid inlet groove, and the size of the liquid inlet hole is smaller than that of the liquid inlet groove. The smaller the size of the liquid inlet hole, the less the strength of the docking member decreases, but it does not prevent the liquid inlet hole and the liquid inlet groove from cooling the input liquid-cooled rotor.

[0050] After the shaft hole is connected to the motor rotating shaft, one end of the liquid inlet groove can obtain the coolant flowing out from the liquid outlet hole of the motor rotating shaft. Under the action of centrifugal force, the coolant flows to the other end of the liquid inlet groove. When the other end is communicated with the liquid inlet hole on the docking member, the coolant can be output to the liquid-cooled rotor.

[0051] The range of the outer radius of the counterweight ensures that the liquid inlet groove has enough extension space to extend to the position where it is docked with the liquid inlet hole, and can also prevent the size of the counterweight from being too large.

[0052] In this embodiment, the outer edge of the counterweight is provided with a lug, and the lug is provided with a positioning hole 203 for installation. The lug is a local structure. Compared with setting the positioning hole by increasing the overall size of the counterweight, the lug requires less additional material, which plays a role in reducing costs.

[0053] Embodiment 2

[0054] The difference between this embodiment and Embodiment 1 is that the specific structure of the docking member is different.

[0055] Reference Figure 3As shown, in this embodiment, the docking member 1 has a through hole 103, and the diameter of the through hole 103 is equal to the diameter of the shaft hole 202 of the counterweight member 2; one end of the liquid inlet hole communicates with the through hole, and the other end extends radially to form a slot hole having the same shape and size as the liquid inlet groove.

[0056] When the shape and size of the liquid inlet hole and the liquid inlet groove are the same, the flow area of the liquid inlet hole is equal to the flow area of the liquid inlet groove. Then, the flow rate of the liquid inlet hole is basically equal to the flow rate of the liquid inlet groove, which not only minimizes the flow loss to the greatest extent but also avoids reducing the strength of the docking member due to excessive enlargement of the liquid inlet hole.

[0057] In this embodiment, the docking member is made of a non-magnetic steel plate with a thickness of less than 4 mm, which reduces the material cost and avoids electromagnetic interference to the motor.

[0058] Embodiment 3

[0059] Due to the small thickness of the docking member, it is difficult to position the docking member circumferentially and axially in the shaft insertion process. To facilitate positioning and improve the installation efficiency, in this embodiment: the counterweight member has a shaft hole for interference fit connection with the motor shaft. The docking member 1 and the counterweight member 2 are coaxially fixedly connected as a whole, and the axes of the shaft hole and the through hole coincide. They can be fixed by welding, bolt connection, clamping, etc. to form an assembly as shown in Figure 4 the assembly shown.

[0060] Refer to Figure 5 As shown, first insert an assembly 1-2 into the motor shaft 4, and ensure that the liquid inlet groove on the counterweight member is aligned with the liquid outlet hole 401 at one end of the motor shaft 4 to ensure that the liquid inlet groove can obtain the coolant flowing out from the liquid outlet hole 401 of the motor shaft 4. Then, insert the liquid-cooled rotor 3 into the motor shaft 4 and locate it between the liquid outlet holes 401 at both ends of the motor shaft 4. Finally, insert another assembly 1-2 into the motor shaft 4 and ensure that the liquid inlet groove on the counterweight member is aligned with the liquid outlet hole 401 at the other end of the motor shaft 4.

[0061] After the above assembly is completed, a cooling system for the oil-cooled rotor is formed. When this cooling system is used in a motor, a motor with a lower cost and lighter weight is obtained.

[0062] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of this application.

Claims

1. A weight balancing device for a liquid-cooled rotor, characterized in that: Comprising: A counterweight and a docking member; The counterweight has a liquid inlet groove for inputting coolant; The docking member has a liquid inlet hole and a liquid outlet hole. The liquid inlet hole is used to input the coolant in the liquid inlet groove into the liquid-cooled rotor, and the liquid outlet hole is used to output the coolant from the liquid-cooled rotor; The axial projection area of the counterweight is smaller than the axial projection area of the docking member.

2. The weight balancing device for a liquid-cooled rotor according to claim 1, characterized in that: The counterweight has a shaft hole for interference-fit connection with the motor shaft.

3. The weight balancing device for a liquid-cooled rotor according to claim 2, characterized in that: The docking member has a through hole for passing the motor shaft.

4. The weight balancing device for a liquid-cooled rotor according to claim 3, characterized in that: The docking member and the counterweight are coaxially fixedly connected as a whole, and the axes of the shaft hole and the through hole coincide.

5. The weight balancing device for a liquid-cooled rotor according to claim 1, characterized in that: The counterweight has a shaft hole. One end of the liquid inlet groove is communicated with the shaft hole, and the other end extends radially; and after the counterweight and the docking member are coaxially docked, the liquid inlet groove can extend to a position communicated with the liquid inlet hole.

6. The weight balancing device for a liquid-cooled rotor according to claim 5, characterized in that: The docking member has a through hole, and the diameter of the through hole is not less than the diameter of the shaft hole; one end of the liquid inlet hole is communicated with the through hole, and the other end extends radially to form a slot hole, and the flow area of the slot hole is not less than the flow area of the liquid inlet groove.

7. The weight balancing device for a liquid-cooled rotor according to claim 1, characterized in that: The liquid inlet holes and the liquid outlet holes are alternately distributed in the circumferential direction. The liquid inlet holes are equally spaced, and the liquid outlet holes are equally spaced.

8. The weight balancing device for a liquid-cooled rotor according to claim 1, characterized in that: The docking member is annular.

9. The weight balancing device for a liquid-cooled rotor according to claim 1, characterized in that: The counterweight is annular, and the outer radius of the counterweight satisfies the following relationship: R1 < R < R2, where R represents the outer radius of the counterweight, R1 represents the maximum radial distance from the liquid inlet hole to the central axis of the docking member, and R2 represents the maximum radial distance from the liquid outlet hole to the central axis of the docking member.

10. The weight balancing device for a liquid-cooled rotor according to claim 1, characterized in that: Lugs are provided on the outer edge of the counterweight, and positioning holes for installation are provided on the lugs.

11. The weight balancing device for a liquid-cooled rotor according to claim 1, characterized in that: The docking member is made of a non-magnetic steel plate with a thickness of less than 4 mm.

12. A cooling system, characterized in that: A weight balance device for a liquid-cooled rotor according to any one of claims 1 to 11 further includes a motor shaft and a liquid-cooled rotor; the weight balance device for the liquid-cooled rotor is docked with the liquid-cooled rotor to form a coolant passage and is sleeved on the motor shaft.

13. The cooling system according to claim 12, characterized in that The docking member is annular, and the outer diameter of the docking member is not greater than the outer diameter of the liquid-cooled rotor.

14. A motor, characterized in that: A weight balance device for a liquid-cooled rotor according to claim 12 is included.

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