CN112072814A - Rotor subassembly, motor, compressor and refrigerating plant - Google Patents

Abstract

The present application generally relates to the field of household appliances, and in particular, to a rotor assembly, a motor, a compressor and a refrigeration device. The rotor assembly includes a rotor iron core, and the rotor iron core has a rotor hole and a magnetic steel slot. The rotor iron core is provided with a circulation hole for the circulation of the refrigerant and a diversion groove opened at the bottom end of the rotor iron core, the circulation hole is communicated with the diversion groove, and the diversion groove is away from the side of the circulation hole It has an inclined guide wall to guide the refrigerant to flow into the flow hole from the tangential and radial directions of the rotor iron core, accelerate the flow speed of the refrigerant when it enters the flow hole, improve the heat dissipation effect of the rotor iron core, and reduce the permanent magnet There is a risk of demagnetization, which improves motor performance.

Description

Rotor assemblies, motors, compressors and refrigeration units

technical field

The present application generally relates to the field of household appliances, and in particular, relates to a rotor assembly, a motor, a compressor and a refrigeration device.

Background technique

With the rapid development and wide application of refrigeration equipment, the rapid improvement of inverter compressor technology has been promoted. At present, the motor rotor of the commonly used variable frequency compressor is provided with a circulation hole for the circulation of the refrigerant, and the heat energy generated by the rotor is conducted through the refrigerant to realize the cooling of the motor. It consists of magnets, upper and lower baffles, main and auxiliary balance blocks and screws. Among them, the rotor iron core circulation holes provide refrigerant channels to dissipate heat from the rotor iron core. The circulation speed is slow and the rotor iron core heat dissipation is poor.

SUMMARY OF THE INVENTION

A series of concepts in simplified form have been introduced in the Summary section, which are described in further detail in the Detailed Description section. The content part of this application is not intended to attempt to limit the key features and necessary technical features of the claimed technical solution, much less an attempt to determine the protection scope of the claimed technical solution.

In order to solve the technical problem of poor heat dissipation effect of the rotor iron core, the main purpose of the present application is to provide a rotor assembly, a motor, a compressor and a refrigeration device.

In order to realize the above-mentioned purpose of the invention, the application adopts the following technical solutions:

A rotor assembly includes a rotor iron core, the rotor iron core has a rotor hole and a magnetic steel slot;

The rotor iron core is provided with a circulation hole for the circulation of the refrigerant and a diversion groove opened at the bottom end of the rotor iron core, the circulation hole is communicated with the diversion groove, and the diversion groove is far from the circulation hole. One side has an obliquely arranged flow guide wall, and the flow guide wall is used to form a flared structure to guide the refrigerant to flow into the flow hole from the tangential or radial direction of the rotor core through the guide groove.

Further, in some embodiments of this solution, the above-mentioned flow hole is provided between the rotor hole and the magnetic steel slot.

Further, in some embodiments of this solution, the clear distance between the above-mentioned flow hole and the magnetic steel slot is H ₁ , and the distance between the center of the flow hole and the magnetic steel slot is H ₂ , 0.58< H ₁ /H ₂ <0.71.

Further, in some embodiments of this solution, the length of the flow guide wall in the radial direction of the rotor iron core is L ₁ , and the side of the flow guide wall that extends obliquely in the axial direction of the rotor iron core is a hypotenuse, and the length of the vertical projection of the hypotenuse in the axial direction of the rotor core is L ₂ , 0<L ₂ /L ₁ <0.035.

Further, in some embodiments of this solution, the profile of the flow guide surface of the flow guide wall is a straight line or a concave curve.

Further, in some embodiments of the present solution, the area of the guide surface of the guide wall is S ₁ , the area of the end surface of the flow hole is S ₂ , and S ₁ : S ₂ ≤0.561.

Further, in some embodiments of this solution, the rotor assembly further includes a baffle plate mounted on the bottom end of the rotor iron core, and the baffle plate is provided with connecting holes corresponding to the guide grooves and the flow holes.

Further, in some embodiments of this solution, the connection hole has a flow guide portion corresponding to the flow guide groove and a flow portion corresponding to the flow hole, and the flow guide portion is located on one side of the flow guide wall An inclined wall is provided as an extension of the flow guide wall.

Further, in some embodiments of this solution, the acute angle formed by the above-mentioned flow guide wall and the bottom end face of the rotor iron core toward the flow guide groove is θ ₁ , and the inclined wall of the baffle and the baffle The acute angle formed by the outer surface of the guide groove toward the guide groove is θ ₂ , and 0≤θ ₂ ≤θ ₁ ≤60°.

Further, in some embodiments of this solution, the diameter of the flow hole is r ₁ , and the length of the flow guide wall in the radial direction of the rotor core is L ₁ , 0.92<L ₁ /r ₁ ≤1.

An electric motor includes the above-mentioned rotor assembly.

A compressor is installed with the above-mentioned motor.

A refrigeration device is installed with the above compressor.

As can be seen from the above technical solutions, the advantages and positive effects of the rotor assembly, motor, compressor and refrigeration device of the present application are:

Accelerate the flow speed of the refrigerant in the circulation hole, improve the heat dissipation effect of the rotor core, reduce the risk of demagnetization of the permanent magnet, and improve the performance of the motor.

The rotor assembly includes a rotor iron core, the rotor iron core has a rotor hole and a magnetic steel slot, the rotor iron core is provided with a circulation hole for the circulation of refrigerant and a guide groove opened at the bottom end of the rotor iron core, the circulation The hole is communicated with the guide groove, and the side of the guide groove away from the flow hole has a guide wall arranged obliquely, so as to guide the refrigerant to flow into the flow hole from the tangential and radial directions of the rotor core , to accelerate the flow speed of the refrigerant when it enters the flow hole.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. In other words, on the premise of no creative labor, other drawings can also be obtained from these drawings.

FIG. 1 is a schematic structural diagram of a rotor core of a rotor assembly according to an exemplary embodiment.

Fig. 2 is a schematic structural diagram of a baffle plate of a rotor assembly according to an exemplary embodiment.

Fig. 3 is a schematic diagram showing an assembly structure of a rotor core and a baffle plate of a rotor assembly according to an exemplary embodiment.

Fig. 4 is a schematic cross-sectional structure diagram of a rotor assembly according to an exemplary embodiment.

Fig. 5 is a schematic diagram showing an assembly structure of a rotor core and a stator of a motor according to an exemplary embodiment.

Among them, the reference numerals are described as follows:

100-rotor core; 200-stator; 300-baffle; 400-winding;

110 - rotor hole; 120 - magnetic steel slot; 130 - guide groove; 140 - flow hole; 150 - screw hole; 131 - guide wall; 210 - first channel; 220 - second flow channel;

310-connection hole; 320-installation hole; 330-shaft hole;

311 - air guide; 312 - flow; 311'1 - inclined wall.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

This solution provides a rotor assembly, a motor, a compressor and a refrigeration device. The rotor assembly includes a rotor iron core 100, the rotor iron core 100 has a rotor hole 110 and a magnetic steel slot 120, and the rotor iron core 100 is provided with a cooling medium. The circulation hole 140 for circulation and the guide groove 130 opened at the bottom end of the rotor core 100 , the circulation hole 140 communicates with the guide groove 130 , and the guide groove 130 is away from the side of the circulation hole 140 . There is an inclined guide wall 131 to guide the refrigerant to flow into the flow hole 140 from the tangential and radial directions of the rotor iron core 100 , accelerate the flow speed of the refrigerant when it enters the flow hole 140 , and improve the heat dissipation of the rotor iron core 100 The effect is to reduce the risk of demagnetization of the permanent magnet and improve the performance of the motor.

1 and 4, the rotor assembly includes a rotor core 100 and a baffle 300. The rotor core 100 is provided with a rotor hole 110, a magnetic steel slot 120 and a screw hole 150. Between the rotor hole 110 and the magnetic steel slot 120 A flow hole 140 is provided between the rotor core 100, the flow hole 140 axially penetrates the rotor core 100, a guide groove 130 is opened on the bottom end surface of the rotor core 100 and communicated with the flow hole 140. The extension direction of the guide groove 130 is the same as that of the rotor hole. 110 is perpendicular to the direction of the flow hole 140, and the side of the flow guide groove 130 away from the flow hole 140 has an inclined guide wall 131. As shown in FIG. 4, the side of the guide wall 131 connected to the bottom of the guide groove 130 faces the flow hole 140 is inclined to form a flared structure on the side of the guide groove 130 away from the flow hole 140, while the guide wall 131 guides the refrigerant to enter the flow hole 140 from the radial or tangential direction of the rotor core 100, and the screw hole 150 is located in the flow hole 140. The guide groove 130 is on the side away from the flow hole 140 . In this solution, under the understanding of those skilled in the art, there may be a plurality of magnetic steel grooves 120, and the plurality of magnetic steel grooves 120 are distributed in a circular shape. The number of steel slots 120 is the same. When the rotor iron core 100 is installed, the side of the flow hole 140 where the guide groove 130 is arranged faces the rotation direction of the iron core of the stator 200, so that the guide groove 130 can work and inhale the refrigerant to accelerate the refrigerant. flow speed.

In this embodiment, the diameter of the rotor core 100 is defined as D ₁ , the clear distance between the flow hole 140 and the magnetic steel slot 120 is defined as H ₁ , and the distance between the center of the flow hole 140 and the magnetic steel slot 120 is defined as H ₂ , the clear distance between the flow hole 140 and the rotor hole 110 is defined as H ₃ , the clear distance between the screw hole 150 and the flow hole 140 is defined as a ₁ , the depth of the flow slot is defined as h ₄ , the guide wall 131 is in the rotor The length of the iron core 100 in the radial direction is L ₁ , the side of the guide wall 131 extending obliquely in the axial direction of the rotor iron core 100 is a hypotenuse, and the length of the hypotenuse in the axial direction of the rotor iron core 100 is a vertical projection of L _2. The area of the guide surface of the guide wall 131 is S ₁ , the area of the end surface of the flow hole 140 is S ₂ , and the acute angle formed by the guide wall 131 and the bottom end surface of the rotor core 100 toward the guide groove 130 is θ ₁ , the diameter of the flow hole 140 is r ₁ , the inner wall surface of the flow hole 140 is defined as S ₃ , and the area of the bottom end surface of the rotor core 100 is defined as S ₄ .

The baffle 300 is provided with a shaft hole 330 corresponding to the rotor hole 110 , and the shaft hole 330 has the same diameter as the rotor hole 110 . The mounting holes 320 corresponding to 150 facilitate the mounting and fixing of the baffle 300 on the rotor core 100 . The connection hole 310 has a guide portion 311 corresponding to the guide groove 130 and a flow portion 312 corresponding to the flow hole 140 . The outline of the connection hole 310 is the same as that of the guide groove 130 plus the flow hole 140 . One side of the flow wall 131 is provided with an inclined wall 311'1 as an extension of the flow guide wall 131. The inclined wall 311'1 of the baffle 300 and the outer surface of the baffle 300 form an acute angle toward the flow guide groove 130. θ ₂ , in this solution, 0≤θ ₂ ≤θ ₁ ≤60°, and the structure shown in FIG. 1 is used for illustration. When the rotor core 100 rotates counterclockwise, the guide groove 130 is tangential or radial for the refrigerant to flow. The circulation path is provided, the circulation of the refrigerant is accelerated, and the heat dissipation effect of the rotor core 100 is improved. The length of the guide wall 131 in the radial direction of the rotor iron core 100 is L ₁ , and the length of the vertical projection of the hypotenuse in the axial direction of the rotor iron core 100 is L ₂ , 0<L ₂ /L ₁ <0.035, the guide wall _The ratio of the guide surface area S1 of the 131 to the end surface area S2 _of the flow hole 140 satisfies: S1 _{: S2≤0.561} , which ensures the guide effect of the guide groove 130, so that more refrigerant enters the guide groove 130, And enter the flow hole 140 from the guide groove 130 . The depth of the flow chute h ₄ /h ₅ <0.083, h ₅ is the height of the rotor iron core 100, which increases the tangential area of the guide wall 131, increases the refrigerant flow, and accelerates the heat dissipation of the stator 200 iron core. The thickness of the rotor baffle 300 is c ₁ /h ₅ ≤0.05, the baffle 300 is used to prevent the magnetic steel from falling off when the rotor core 100 rotates at high speed, and the baffle 300 is made of non-magnetic conductive material. In this solution, the outer diameter of the baffle 300 is defined as D ₂ , 0.96≤ D ₂ /D ₁ ≤1, to prevent the baffle 300 from interfering with the rotation of the rotor core 100 , in order to prevent the screw hole 150 from affecting the flow of refrigerant to the flow groove 130 , the clear distance between the screw hole 150 and the flow hole 140 is defined as a ₁ ≥ 1.5 mm. In order to ensure the structural strength of the rotor core 100 without affecting the micro-deformation when the rotor hole 110 is matched with the rotating shaft, the clear distance between the flow hole 140 and the rotor hole 110 is defined as H ₃ , H ₃ >3mm, and the flow hole 140 The net distance H ₁ from the magnetic steel slot 120 and the distance H ₂ between the center of the flow hole 140 and the magnetic steel slot 120 satisfy: 0.58<H ₁ /H ₂ <0.71, and the guide wall 131 is in the radial direction of the rotor core 100 . The direction length L1 and the diameter _{r1 of} the flow hole 140 satisfy: 0.92<L1/r1≤1, which increases the flow area of the refrigerant, accelerates the flow speed of the refrigerant, and accelerates the heat dissipation of the rotor core 100 . On the whole, the inner wall surface S ₃ of the flow hole 140 and the area S ₄ of the bottom end face of the rotor core 100 satisfy: 0≤S ₁ /S ₂ ≤ 0.45, which minimizes the impact of the flow hole 140 on the magnetic circuit of the rotor core 100 Influence, ensure the efficiency of the motor, and increase the heat dissipation effect of the stator 200 iron core.

This embodiment also provides a motor, the motor is installed with the above-mentioned rotor assembly, and as shown in FIG. 5 , the motor further includes a stator 200 and a winding 400 installed on the stator 200 , and a plurality of axially extending recesses are defined on the circumferential side of the stator 200 . The slots and grooves form the first circulation channel 210 for the refrigerant to circulate, the gap between the rotor core 100 and the stator 200 and the gap between the windings 400 of the stator 200 form the second circulation channel 220, and the circulation hole 140 can be used as the third circulation channel. Improve the flow of refrigerant and improve the heat dissipation effect of the motor.

This embodiment also provides a compression garment, and the compressor is installed with the above-mentioned motor.

This embodiment also provides a refrigeration device, and the refrigeration device is installed with the above-mentioned compressor.

In summary, this solution provides a rotor assembly, a motor, a compressor and a refrigeration device. By designing the rotor iron core 100, the speed of the refrigerant flowing through the rotor iron core 100 is accelerated, the flow rate of the refrigerant is increased, and the performance of the rotor iron core 100 is improved. The heat dissipation effect reduces the risk of demagnetization of the permanent magnet and improves the performance of the motor. The rotor iron core 100 has a rotor hole 110 and a magnetic steel slot 120. The guide groove 130, the flow hole 140 communicates with the guide groove 130, the guide groove 130 has an inclined guide wall 131 on the side away from the flow hole 140, and the guide wall 131 is used to form a notch in the guide groove 130 The flaring structure is used to guide the refrigerant to flow into the flow hole 140 from the tangential or radial direction of the rotor core 100 through the guide groove 130 to increase the flow rate of the refrigerant.

It should be noted that, in this document, relational terms such as "first" and "second" etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these There is no such actual relationship or sequence between entities or operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The above descriptions are only specific embodiments of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims (13)

1. A rotor assembly, characterized by comprising a rotor core (100), the rotor core (100) having a rotor bore (110) and a magnet steel slot (120);

the rotor core (100) is provided with a circulation hole (140) for circulation of a refrigerant and a guide groove (130) arranged at the bottom end of the rotor core (100), the circulation hole (140) is communicated with the guide groove (130), one side, away from the circulation hole (140), of the guide groove (130) is provided with a guide wall (131) which is obliquely arranged, and the guide wall (131) is used for forming a flaring structure so as to guide the refrigerant to flow into the circulation hole (140) from the tangential direction or the radial direction of the rotor core (100) through the guide groove (130).

2. The rotor assembly of claim 1, wherein the flow holes (140) are disposed between the rotor bore (110) and the magnet steel slot (120).

3. The rotor assembly of claim 2, wherein the clear distance between the flow holes (140) and the magnetic steel slots (120) is H₁The distance between the center of the circulation hole (140) and the magnetic steel groove (120) is H₂，0.58＜H₁/H₂＜0.71。

4. The rotor assembly according to claim 1, wherein the guide wall (131) has a length L in a radial direction of the rotor core (100)₁The edge of the guide wall (131) extending in the axial direction of the rotor core (100) in an inclined mode is an inclined edge, and the length of the vertical projection of the inclined edge in the axial direction of the rotor core (100) is L₂，0＜L₂/L₁＜0.035。

5. The rotor assembly of claim 1, wherein the profile of the flow guide surface of the flow guide wall (131) is a straight line or an inner concave curve.

6. The rotor assembly as recited in claim 1, wherein the flow guide surface area of the flow guide wall (131) is S₁The area of the end surface of the flow hole (140) is S₂And S is₁:S₂≤0.561。

7. The rotor assembly of claim 1, further comprising a baffle (300) installed at a bottom end of the rotor core (100), wherein the baffle (300) is provided with a connection hole (310) corresponding to the guide groove (130) and the flow hole (140).

8. The rotor assembly as claimed in claim 7, wherein the connection hole (310) has a guide portion (311) corresponding to the guide groove (130) and a flow portion (312) corresponding to the flow hole (140), and the guide portion (311) is provided with an inclined wall (311' 1) at one side of the guide wall (131) as an extension of the guide wall (131).

9. The rotor assembly according to claim 8, wherein the guide wall (131) forms an acute included angle θ with the bottom end surface of the rotor core (100) toward the guide groove (130)₁The inclined wall (311' 1) of the baffle plate (300) and the outer surface of the baffle plate (300) form an acute included angle theta towards the diversion trench (130)₂，0≤θ₂≤θ₁≤60°。

10. The rotor assembly of claim 1, wherein the flow holes (140) have a diameter r₁The length of the flow guide wall (131) in the radial direction of the rotor core (100) is L₁，0.92＜L₁/r₁≤1。

11. An electrical machine comprising a rotor assembly as claimed in any one of claims 1 to 10.

12. A compressor, characterized in that the motor of claim 11 is installed.

13. A refrigerating apparatus, characterized in that the compressor of claim 12 is installed.

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