Stator assembly and rotary compressor

Abstract

The present application relates to the technical field of compressor, and provides a stator assembly and a rotary compressor.The stator assembly comprises a stator core, a plurality of windings are distributed in the circumferential direction of the inner periphery of the stator core, adjacent windings are separated by insulation limiters, and a winding gap is formed between the insulation limiters of adjacent windings; a heat pipe assembly comprises an evaporation section extending into the winding gap from the end surface of the stator core and a condensation section extending out of the outer periphery of the stator core, and the extension direction of the evaporation section and the extension direction of the condensation section form a U shape.The evaporation section of the heat pipe assembly extends into the winding gap from the end surface of the stator core, and the condensation section extends out of the outer periphery of the stator core, forming a U-shaped heat pipe assembly with super-high heat conduction characteristics, which can timely discharge the heat generated by the windings and the heat of the stator core to the outside of the motor, thereby reducing the temperature of the motor, improving the efficiency of the motor, and further improving the overall efficiency of the rotary compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor, in particular to a stator assembly and a rotary compressor comprising the same. BACKGROUND

[0002] In the field of compressor, the application of high speed of variable frequency compressor is more and more, which leads to the temperature of motor rising, and causes the efficiency of motor and the efficiency of the whole compressor to be affected.

[0003] Therefore, it is necessary to study the motor thermal management technology of the compressor to reduce the influence of motor temperature rise on the efficiency of motor and the efficiency of the whole compressor.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information which does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] In view of the problems in the prior art, the present application provides a stator assembly and a rotary compressor comprising the same, which utilizes heat pipe technology to reduce the temperature rise of motor, improve the efficiency of motor and the efficiency of the whole rotary compressor.

[0006] According to one aspect of the present application, a stator assembly is provided, comprising: a stator core, a plurality of windings are distributed circumferentially on the inner periphery of the stator core, adjacent windings are spaced by an insulating spacer, and a winding gap is formed between the insulating spacers of adjacent windings; a heat pipe assembly comprising an evaporation section extending into the winding gap from the end face of the stator core and a condensation section extending out of the outer periphery of the stator core, the extension direction of the evaporation section and the extension direction of the condensation section form a U shape.

[0007] In some embodiments, the evaporation section comprises a ring-shaped main pipe and a plurality of flat micro heat pipes, the ring-shaped main pipe is arranged on the end face of the stator core, and the plurality of flat micro heat pipes respectively extend perpendicularly to the ring-shaped main pipe and extend into each winding gap.

[0008] In some embodiments, the condensation section extends out of the outer periphery of the ring-shaped main pipe and extends out of the outer periphery of the stator core perpendicularly to the ring-shaped main pipe.

[0009] In some embodiments, the end face of the ring-shaped main pipe is attached to the end face of the stator core; and the two flat surfaces of the flat micro heat pipe are respectively attached to the insulating spacers of adjacent windings, so that in each winding gap, the flat micro heat pipe and the insulating spacer, and the insulating spacer and the winding form a surface contact respectively.

[0010] In some embodiments, the extension height of the flat micro heat pipe is the same as the height of the winding along the central axis of the stator core.

[0011] In some embodiments, a plurality of the flat micro heat pipes are distributed in a central symmetry along the central axis of the stator core.

[0012] In some embodiments, the pipe diameter of the annular header is greater than or equal to the pipe diameter of the condensing section.

[0013] In some embodiments, the heat pipe assembly is a gravity heat pipe, the flat micro heat pipe and the condensing section extend upward perpendicularly to the annular header, and the extension height of the condensing section is higher than the extension height of the flat micro heat pipe, the heat transfer medium in the heat pipe assembly flows back from the condensing section to the evaporating section under the action of gravity.

[0014] In some embodiments, the pipe wall of the heat pipe assembly is provided with a wick, and the capillary suction of the wick of the flat micro heat pipe is greater than the capillary suction of the wick of the annular header, the heat transfer medium in the heat pipe assembly flows back from the condensing section to the evaporating section under the action of the capillary suction of the wick.

[0015] According to another aspect of the present application, a rotary compressor is provided, which comprises the stator assembly of any of the above embodiments; and a housing, the stator core and the evaporating section of the heat pipe assembly are accommodated in the housing, and the condensing section of the heat pipe assembly extends out of the housing.

[0016] Compared with the prior art, the present application has at least the following beneficial effects:

[0017] The end surface of the stator core is inserted into the winding gap through the evaporating section of the heat pipe assembly, and the condensing section extends out of the periphery of the stator core, forming a U-shaped heat pipe assembly with super-high thermal conductivity, which can timely discharge the heat generated by the winding and the heat of the stator core to the outside of the motor, thereby reducing the temperature of the motor, improving the efficiency of the motor, and further improving the overall efficiency of the rotary compressor;

[0018] When the stator assembly is assembled into the rotary compressor, the condensing section of the heat pipe assembly extends out of the housing of the rotary compressor, which can timely conduct the heat of the motor to the outside of the rotary compressor;

[0019] In addition, the reduction of the temperature rise of the motor can further reduce the exhaust temperature of the rotary compressor, reduce the load of the air conditioner condenser, and further reduce the temperature of the refrigerant and lubricating oil mixture in the back pressure cavity of the rotary compressor, so as to reduce the heating amount outside the cylinder, thereby improving the indicated efficiency and overall efficiency of the rotary compressor.

[0020] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application, as claimed. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application. It is to be understood that the drawings are designed solely for purposes of illustration to be used in conjunction with the description in

[0022] Figure 1 Fig. 1 shows a perspective view of a stator assembly in an embodiment of the present application;

[0023] Figure 2 Fig. 2 shows a sectional view of the stator assembly in an embodiment of the present application;

[0024] Figure 3 Fig. 3 shows a perspective view of a heat pipe assembly in an embodiment of the present application; and

[0025] Figure 4 Fig. 4 shows a sectional view of the heat pipe assembly in an embodiment of the present application. DETAILED DESCRIPTION

[0026] Example implementations will now be described with reference to the drawings; however, these implementations are merely examples and are not intended to limit the present application. Rather, the present application is to be given broad scope consistent with the principles described herein. Like reference numbers in the figures indicate like elements, and redundant description has been omitted for clarity.

[0027] Figure 1 Fig. 1 shows a perspective view of a stator assembly in an embodiment of the present application, Figure 2 Fig. 2 shows a sectional view of the stator assembly in an embodiment of the present application, Figure 3 Fig. 3 shows a perspective view of a heat pipe assembly in an embodiment of the present application, Figure 4 Fig. 4 shows a sectional view of the heat pipe assembly in an embodiment of the present application. Figures 1 to 4 As shown, the stator assembly in the embodiment mainly comprises a stator core 1, a plurality of windings 11 distributed circumferentially around the inner periphery of the stator core 1, and insulation limiters spacing between adjacent windings 11, and winding gaps 110 formed between the insulation limiters of adjacent windings 11; a heat pipe assembly 2 comprising an evaporation section 21 extending into the winding gaps 110 from the end face of the stator core 1 and a condensation section 22 extending beyond the outer periphery of the stator core 1, the extension direction of the evaporation section 21 and the extension direction of the condensation section 22 forming a U shape.

[0028] The stator core 1 is shaped as a ring structure, and a plurality of stator teeth (not shown in detail in the figure) are arranged on the inner periphery of the stator core 1. A coil is wound on each stator tooth to form a winding 11. The winding 11 is covered with an insulating spacer on at least the side thereof in the circumferential direction. The insulating spacer is, for example, a plastic film, so that adjacent windings 11 are spaced apart by the insulating spacer. The insulating spacer insulates adjacent windings 11 from each other and fixes each winding 11 to the corresponding stator tooth. The insulating spacers of adjacent windings 11 form a winding gap 110 therebetween.

[0029] The heat pipe assembly 2 is an internal closed circulation structure, and is filled with a heat transfer medium such as water or ethylene glycol. The heat pipe assembly 2 uses the phase change process of the heat transfer medium evaporated in the evaporation section 21 and condensed in the condensation section 22 to quickly conduct heat. The motor of the rotary compressor generates a large amount of heat during operation. Considering that the rotational speed of the motor rotor is high, it is difficult to introduce a heat pipe structure. Therefore, in the embodiment, the heat pipe assembly 2 is combined with the stator core 1. When the motor generates heat, the evaporation section 21 is heated, so that the heat transfer medium in the evaporation section 21 rapidly vaporizes and absorbs the heat generated by the winding 11 and the heat of the stator core 1. After the heat transfer medium vaporizes, the steam flows to the condensation section 22, releases heat in the condensation section 22, and then flows back to the evaporation section 21, so that the heat generated by the winding 11 and the heat of the stator core 1 are continuously conducted away.

[0030] Therefore, in the embodiment, the evaporation section 21 of the heat pipe assembly 2 extends into the winding gap 110 from the end surface of the stator core 1, and the condensation section 22 extends outward from the outer periphery of the stator core 1, so that the heat pipe assembly 2 has a U-shaped structure with super-high heat conduction characteristics. The heat generated by the winding 11 and the heat of the stator core 1 are promptly discharged to the outside of the motor, so as to reduce the temperature of the motor and improve the power generation voltage of the motor, thereby improving the efficiency of the motor. The reduction of the temperature rise of the motor can further reduce the exhaust temperature of the rotary compressor and the load of the air conditioner condenser. In addition, the temperature of the refrigerant and lubricating oil mixture in the back pressure cavity of the rotary compressor can be further reduced, so as to reduce the heating amount of the outside of the cylinder, thereby improving the indicated efficiency of the rotary compressor and the overall energy efficiency.

[0031] In some embodiments, the heat pipe assembly 2 is combined with the stator core 1. Figure 1 and Figure 3As shown, the evaporation section 21 includes an annular manifold 211 and a plurality of flat micro heat pipes 212, the annular manifold 211 is arranged at the end face of the stator core 1 to conduct the heat of the stator core 1, and the plurality of flat micro heat pipes 212 respectively extend perpendicularly to the annular manifold 211, each flat micro heat pipe 212 extends into the inter-winding gap 110 between adjacent windings 11 to conduct the heat generated by the winding 11. The inter-winding gap 110 between each adjacent two windings 11 is provided with a flat micro heat pipe 212 to achieve good heat conduction effect on the winding coils of the entire stator core 1. While the flat micro heat pipe 212 conducts the heat generated by the winding 11, the annular manifold 211 serves as the evaporation manifold of the flat micro heat pipe 212, and the flat micro heat pipe 212 and the annular manifold 211 together serve as the evaporation section 21 of the heat pipe assembly 2, and the condensation section 22 extends outward from the outer periphery of the stator core 1 to quickly conduct the heat generated by the winding 11 and the heat of the stator core 1 to the outside of the stator assembly.

[0032] Figure 1 As shown, the stator core 1 has nine inter-winding gaps 110 formed between adjacent windings 11, so the flat micro heat pipe 212 is arranged in each inter-winding gap 110. Figure 3 As shown, the flat micro heat pipe 212 is arranged in the inter-winding gap 110 between the adjacent windings 11. Figure 1 As shown, the evaporation section 21 of the heat pipe assembly 2 of the stator core 1 is provided with nine flat micro heat pipes 212, the nine flat micro heat pipes 212 are respectively inserted into the nine inter-winding gaps 110 formed by the adjacent windings 11, and the nine flat micro heat pipes 212 are respectively in communication with the annular manifold 211. In other embodiments, the evaporation section 21 of the heat pipe assembly 2 can be adaptively adjusted to adapt to different structures of the stator core 1, as long as the annular manifold 211 can be arranged at the end face of the stator core 1, the flat micro heat pipe 212 extends from the annular manifold 211 and extends into the inter-winding gap 110 between two windings 11 to achieve good heat conduction effect on the heat generated by the winding 11 and the heat of the stator core 1.

[0033] The flat micro heat pipe 212 extends perpendicularly to the annular manifold 211, on the one hand, the overall structure of the formed evaporation section 21 is adapted to the overall structure of the stator core 1, so that the stator assembly has a stable structure; on the other hand, it is also conducive to the smooth flow of the heat transfer medium between the flat micro heat pipe 212 and the annular manifold 211, quickly taking away the heat generated by the winding 11 and the heat of the stator core 1.

[0034] Further, the condensation section 22 of the heat pipe assembly 2 extends from the outer periphery of the annular manifold 211 and perpendicularly to the annular manifold 211 and extends outward from the outer periphery of the stator core 1. The condensation section 22 and the evaporation section 21 form a U-shaped heat pipe assembly 2, the U-shaped heat pipe assembly 2 has a stable structure and super-high heat conduction characteristics, and is adapted to the structure of the stator core 1, so that the heat pipe assembly 2 and the stator core 1 are stably assembled together to achieve effective conduction of the heat generated by the winding 11 and the heat of the stator core 1.

[0035] In some embodiments, the end surface of the annular manifold 211 is attached to the end surface of the stator core 1, i.e. the end surface of the annular manifold 211 is in surface contact with the end surface of the stator core 1, to increase the contact area between the annular manifold 211 and the stator core 1, enhance the heat conduction effect, and enhance the structural stability. The two flat surfaces of the flat micro heat pipe 212 are respectively attached to the insulating limiters of the adjacent windings 11, so that in each winding gap 110, the flat micro heat pipe 212 and the insulating limiters, and the insulating limiters and the windings 11 respectively form surface contact, to enhance the heat conduction effect of the flat micro heat pipe 212 on the windings 11, and enhance the structural stability. Thus, the entire evaporation section 21 of the heat pipe assembly 2 can be stably matched with the stator core 1 and the windings 11, and achieve good conduction effect on the heat generated by the windings 11 and the heat of the stator core 1.

[0036] In some embodiments, to further enhance the structural stability of the heat pipe assembly 2 and the stator core 1, and enhance the conduction effect of the heat pipe assembly 2 on the heat generated by the windings 11 and the heat of the stator core 1, the structure of the heat pipe assembly 2 can be further limited. For example, in one embodiment, considering that the initial gap between the two windings 11 is 1.4 mm, and considering that there is a plastic film with a thickness of about 0.4 mm, i.e. an insulating limiter, in the initial gap 110, a flat micro heat pipe 212 with a thickness of 1 mm is designed to extend into the winding gap 110 between the two windings 11, so that the flat micro heat pipe 212 can smoothly extend into the winding gap 110 and contact the windings 11 through the insulating limiter without affecting the windings 11. For another example, in one embodiment, along the central axis of the stator core 1, the extension height of the flat micro heat pipe 212 is the same as the height of the winding 11, so that the flat micro heat pipe 212 extends through the entire winding gap 110, to maximize the conduction effect of the flat micro heat pipe 212 on the heat generated by the windings 11. For another example, in one embodiment, along the central axis of the stator core 1, the plurality of flat micro heat pipes 212 are centrally symmetrically distributed. The centrally symmetric distribution of the plurality of flat micro heat pipes 212 not only adapts the distribution structure of the flat micro heat pipe 212 to the distribution structure of the winding 11, but also realizes the structural stability of the entire stator assembly after the heat pipe assembly 2 is assembled with the stator core 1. For another example, in one embodiment, the diameter of the annular manifold 211 is greater than or equal to the diameter of the condensation section 22, to realize the role of the annular manifold 211 as the manifold of the plurality of flat micro heat pipes 212, so that the heat transfer medium in the heat pipe assembly 2 smoothly flows between the flat micro heat pipes 212 and the condensation section 22 through the annular manifold 211.

[0037] Of course, in different embodiments, the evaporation section 21 and the condensation section 22 of the heat pipe assembly 2 can be adaptively adjusted, as long as they can adapt to the structure of the stator core 1 and achieve good conduction effect on the heat generated by the windings 11 and the heat of the stator core 1.

[0038] The heat pipe assembly 2 in each of the above embodiments can be a common heat pipe, which uses the wick provided on the pipe wall to drive the heat transfer medium to return; or can be a gravity heat pipe, which uses gravity to achieve the return of the heat transfer medium.

[0039] For example, in some embodiments, the pipe wall of the heat pipe assembly 2 is provided with a wick (not shown in detail in the figure), and the capillary suction of the wick of the flat micro heat pipe 212 is greater than the capillary suction of the wick of the annular manifold 211, and the heat transfer medium in the heat pipe assembly 2 returns from the condensation section 22 to the evaporation section 21 under the action of the capillary suction of the wick. Specifically, the wick is composed of capillary porous material, when the flat micro heat pipe 212 absorbs the heat generated by the winding 11, the liquid heat transfer medium in the flat micro heat pipe 212 evaporates and vaporizes, taking away the heat of the winding 11, and the evaporated and vaporized heat transfer medium naturally flows from the hot end to the cold end of the heat pipe assembly 2, that is, flows to the condensation section 22 through the annular manifold 211; at the same time, the heat transfer medium in the annular manifold 211 also evaporates and vaporizes after absorbing the heat of the stator core 1 and flows to the condensation section 22 under the action of the pressure difference. Then, the heat transfer medium releases heat and condenses into liquid in the condensation section 22, and the liquid heat transfer medium flows back to the annular manifold 211 and the flat micro heat pipe 212 along the capillary porous material under the action of the capillary suction, so as to realize the circulation of transferring the heat generated by the winding 11 and the heat of the stator core 1 from the evaporation section 21 to the condensation section 22. Since the flat micro heat pipe 212 extends vertically upward from the annular manifold 211, the capillary suction of the wick of the flat micro heat pipe 212 is greater than the capillary suction of the wick of the annular manifold 211, so that the liquid heat transfer medium can smoothly return from the condensation section 22 to the flat micro heat pipe 212 through the annular manifold 211. The capillary suction of the wick of the annular manifold 211 can also be greater than the capillary suction of the wick of the condensation section 22, further assisting the return of the heat transfer medium.

[0040] For another example, in some embodiments, the heat pipe assembly 2 is a gravity heat pipe, the flat micro heat pipe 212 and the condensation section 22 extend vertically upward from the annular manifold 211 respectively, and the extension height of the condensation section 22 is higher than the extension height of the flat micro heat pipe 212, so that the heat transfer medium in the heat pipe assembly 2 returns from the condensation section 22 to the evaporation section 21 under the action of gravity. Specifically, the annular manifold 211 is located at the bottom of the heat pipe assembly 2, and the extension height of the condensation section 22 is higher than the extension height of the flat micro heat pipe 212, so that the return of the heat transfer medium from the condensation section 22 to the evaporation section 21 in the heat pipe assembly 2 can be satisfied by gravity, without the wick of the capillary structure.

[0041] In summary, the stator assembly described in the above embodiments forms a stator assembly based on heat pipe technology by introducing the heat pipe assembly 2 into the stator core 1, so as to reduce the temperature rise of the motor and improve the energy efficiency of the rotary compressor by using the heat pipe technology. Of course, the stator assembly of the above embodiments also includes other conventional structures, for example, the rotor arranged at the inner periphery of the stator core 1, which will not be described in detail here.

[0042] The embodiment of the present application also provides a rotary compressor, which comprises the stator assembly described in any of the above embodiments; and a shell, wherein the stator core 1 and the evaporation section 21 of the heat pipe assembly 2 in the stator assembly are accommodated in the shell, and the condensation section 22 of the heat pipe assembly 2 extends out of the shell. That is, when the stator assembly is assembled to the rotary compressor, the condensation section 22 extends out of the shell of the rotary compressor, so as to conduct the heat of the motor to the outside of the rotary compressor.

[0043] The rotary compressor of the embodiment can be applied to a refrigeration and air conditioning device such as an air conditioner or a refrigerator, and can use the heat pipe technology to realize the discharge of the heat of the motor to the outside of the rotary compressor, so as to improve the overall energy efficiency. Of course, the rotary compressor also includes other conventional components, for example, a pump body structure, a liquid accumulator structure, etc., which will not be described in detail here.

[0044] In summary, the present application introduces the heat pipe technology into the stator structure of the motor, and forms a U-shaped heat pipe assembly 2 with super-high heat conduction characteristics by extending the evaporation section 21 of the heat pipe assembly 2 into the winding gap 110 from the end surface of the stator core 1 and extending the condensation section 22 out of the periphery of the stator core 1, so as to timely discharge the heat of the winding 11 and the heat of the stator core 1 to the outside of the motor, so as to reduce the temperature of the motor, improve the efficiency of the motor, and further improve the overall energy efficiency of the rotary compressor. When the stator assembly is assembled to the rotary compressor, the condensation section 22 of the heat pipe assembly 2 extends out of the shell of the rotary compressor, so as to timely conduct the heat of the motor to the outside of the rotary compressor. The reduction of the temperature rise of the motor can further reduce the discharge temperature of the rotary compressor, reduce the load of the air conditioner condenser, and further reduce the temperature of the refrigerant and lubricating oil mixture in the back pressure cavity of the rotary compressor, so as to reduce the heating amount outside the cylinder, thereby improving the indicated efficiency and overall energy efficiency of the rotary compressor.

[0045] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be regarded as falling within the protection scope of the present application.

Claims

1. A stator assembly, characterized in that, include: A stator core, wherein multiple windings are distributed circumferentially on the inner circumference of the stator core, and adjacent windings are separated by insulating limiting members, forming a winding gap between the insulating limiting members of adjacent windings; A heat pipe assembly includes an evaporation section extending from the end face of the stator core into the winding gap and a condensation section extending out of the outer periphery of the stator core, wherein the extension direction of the evaporation section and the extension direction of the condensation section form a U-shape. The evaporation section includes an annular main pipe and multiple flat micro heat pipes. The annular main pipe is located on the end face of the stator core, and the multiple flat micro heat pipes extend perpendicularly to the annular main pipe and into the gaps of each winding. The diameter of the annular main pipe is larger than the diameter of the condensation section. The heat pipe assembly is a gravity heat pipe. The flat micro heat pipe and the condensing section extend upwards perpendicular to the annular main pipe, with the condensing section extending higher than the flat micro heat pipe. The heat transfer medium within the heat pipe assembly flows back from the condensing section to the evaporating section under gravity. The heat pipe assembly has a liquid wick on its wall, and the capillary suction of the liquid wick of the flat micro heat pipe is greater than that of the liquid wick of the annular main pipe. The heat transfer medium in the heat pipe assembly flows back from the condensation section to the evaporation section under the action of the capillary suction of the liquid wick.

2. The stator assembly as claimed in claim 1, characterized in that, The condensation section extends from the outer periphery of the annular main pipe and extends perpendicularly to the outer periphery of the stator core.

3. The stator assembly as claimed in claim 1, characterized in that, The end face of the annular manifold is in contact with the end face of the stator core; and The two flat surfaces of the flat micro heat pipe are respectively attached to the insulating limiting members of the adjacent windings, so that in each winding gap, the flat micro heat pipe and the insulating limiting member, as well as the insulating limiting member and the winding, respectively form surface contact.

4. The stator assembly as claimed in claim 1, characterized in that, Along the central axis of the stator core, the extension height of the flat micro heat pipe is the same as the height of the winding.

5. The stator assembly as claimed in claim 1, characterized in that, Along the central axis of the stator core, multiple flat micro heat pipes are distributed in a centrally symmetrical manner.

6. A rotary compressor, characterized in that, The rotary compressor includes the stator assembly as described in any one of claims 1-5; and The housing contains the stator core and the evaporation section of the heat pipe assembly, while the condensation section of the heat pipe assembly extends out of the housing.

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