Compressor shell and rolling rotor compressor comprising same

Abstract

The invention provides a compressor shell and a rolling rotor compressor comprising the same, the compressor shell comprises an outer layer shell, an inner layer shell and a connecting part, and the outer layer shell and the inner layer shell are connected through the connecting part and form a U-shaped cavity. The compressor shell comprises the outer-layer shell body and the inner-layer shell body, the cavity between the outer-layer shell body and the inner-layer shell body can be used for storing excessive refrigerant liquid or mixed liquid of refrigerant and lubricating oil, but when the compressor shell is suitable for the rolling rotor type compressor, the inner-layer shell body is directly attached to a motor so as to enhance the heat exchange function; in other words, the motor heats refrigerant liquid through the inner-layer shell so that the refrigerant liquid can be rapidly discharged out of the compressor, heating of the motor can be reduced, oil-liquid separation of mixed liquid can be achieved, separated oil returns into the compressor through the oil return through hole, and meanwhile noise reduction during operation of the compressor can be reduced through the structure of the double-layer shell.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a compressor housing and a rolling rotor type compressor comprising the same. Background Art

[0002] When the air conditioning system is shut down for a long time at a low ambient temperature, the refrigerant in the system is likely to migrate to the compressor in a low-temperature environment. Depending on the refrigerant charge, system downtime and ambient temperature, the final liquid level of the compressor will be different. In severe cases, the liquid level in the compressor housing will be higher than the upper end surface of the motor core or fill the entire compressor; the lubricating oil in the compressor is diluted by the large amount of refrigerant pouring in, resulting in poor lubrication when the compressor starts at low temperatures, and the compressor is prone to problems such as compressor oil shortage, abnormal wear and jamming of the crankshaft, and compressor failure.

[0003] However, when the refrigerant flow rate is large or the operating condition is high frequency, the compressor has a small upper cavity, and a large amount of oil-liquid mixture will accumulate on the upper end surface of the motor core, which will not be drained away in time. This will cause the oil output rate of the compressor to be high and the oil level inside the compressor to be low, resulting in reduced reliability of the compressor operation. Generally speaking, the oil level accumulation can be reduced by increasing the cutting area or flow holes of the motor. However, increasing the cutting area and the stator and rotor flow holes will easily cause the motor efficiency to decrease.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to those skilled in the art. Summary of the invention

[0005] In response to the problems in the prior art, the purpose of the present invention is to provide a compressor housing and a rolling rotor compressor including the same. The cavity between the outer shell and the inner shell of the compressor housing can be used to store excess refrigerant liquid or a mixed liquid of refrigerant and lubricating oil, which can be used to reduce motor heating and improve the overall performance and life of the compressor. At the same time, the double-layer shell structure can also reduce the noise during compressor operation.

[0006] A first aspect of the present invention provides a compressor housing, comprising an outer shell, an inner shell and a connecting portion;

[0007] The outer shell and the inner shell are connected via the connecting portion to form a U-shaped cavity.

[0008] According to the first aspect of the present invention, the housing further comprises at least one oil return hole.

[0009] According to the first aspect of the present invention, the oil return through hole is provided at the connecting portion; and / or

[0010] The oil return through hole is arranged on the inner shell body.

[0011] According to the first aspect of the present invention, the aperture diameter of the oil return through hole is d, satisfying: 1 mm ≤ d ≤ 3 mm.

[0012] According to the first aspect of the present invention, the surface of the outer shell within the U-shaped cavity is corrugated; and / or

[0013] the surface of the inner shell within the U-shaped cavity is corrugated.

[0014] According to the first aspect of the present invention, the distance between the outer shell and the inner shell is L, satisfying: 3 mm ≤ L ≤ 18 mm.

[0015] The second aspect of the present invention provides a rolling rotor compressor, comprising the compressor housing and an electric motor, and the electric motor includes a stator and a rotor.

[0016] According to the second aspect of the present invention, the surface of the inner shell facing away from the U-shaped inner cavity is in interference fit with the stator.

[0017] According to the second aspect of the present invention, the inner shell is disposed between the upper end surface of the iron core of the stator and the upper end surface of the upper cylinder head of the compressor.

[0018] According to the second aspect of the present invention, the height of the inner shell is H;

[0019] the height of the iron core of the stator is L1; the distance between the lower end surface of the iron core of the stator and the upper end surface of the upper cylinder head of the compressor is L2, satisfying: L1 ≤ H ≤ L1 + L2.

[0020] According to the second aspect of the present invention, the housing further includes an oil return through hole provided on the inner shell;

[0021] the oil return through hole is provided between the lower end surface of the iron core of the stator and the upper end surface of the upper cylinder head of the compressor.

[0022] The compressor housing of the present invention includes an outer shell and an inner shell, and the cavity therebetween can be used to store excessive refrigerant liquid or a mixed liquid of refrigerant and lubricating oil. However, when it is applied to a rolling rotor compressor, the inner shell is directly attached to the electric motor to enhance the heat exchange function, that is, the electric motor heats the refrigerant liquid through the inner shell to quickly discharge it from the compressor. In addition to reducing the heat generation of the electric motor, it can also separate the oil in the mixed liquid. The separated oil returns to the compressor through the oil return through hole. At the same time, the structure of the double-layer shell can also reduce the noise during the operation of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present invention will become more apparent. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and thus repeated descriptions thereof will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0024] Figure 1 A cross-sectional view of a compressor housing according to an embodiment of the present invention;

[0025] Figure 2 A structural schematic diagram of a rolling piston compressor according to an embodiment of the present invention;

[0026] Figure 3 A sectional view of a compressor housing according to an embodiment of the present invention;

[0027] Figures 4 to 6 Respectively, enlarged schematic views of the connection portions of compressor housings according to different embodiments of the present invention; and

[0028] Figure 7 and Figure 8 Respectively, structural schematic views of the surfaces of inner housings according to different embodiments of the present invention. Detailed implementation manners

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0030] In the descriptions of this specification, statements with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics represented in connection with the embodiment or example are included in at least one embodiment or example of this specification. Moreover, the specific features, structures, materials, or characteristics represented can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and assemble the different embodiments or examples represented in this specification and the features of different embodiments or examples.

[0031] Throughout the specification, when it is said that a device is "connected" to another device, this includes not only the case of "direct connection", but also the case of "indirect connection" where other elements are placed in between. Relative spatial terms such as "front", "rear", "upper", "lower", etc. can be used to more easily explain the relationship of one device relative to another device illustrated in the drawings. Such terms refer to not only the meanings indicated in the drawings, but also other meanings or operations of the device in use. For example, if the device in the drawing is flipped, a certain device that was described as "under" another device would then be described as "above" another device. Therefore, the exemplary term "under" includes both above and below. The device can be rotated 90° or other angles, and the relative spatial terms are interpreted accordingly.

[0032] Although in some instances the terms first, second, etc. are used herein to denote various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, the first interface and the second interface, etc. are indicated. Furthermore, as used herein, the singular forms "a", "an", and "the" are also intended to include the plural forms unless the context indicates otherwise. It should be further understood that the terms "comprising", "including" indicate the presence of the stated features, steps, operations, elements, components, items, kinds, and / or groups, but do not preclude 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" used herein are interpreted as inclusive, or meaning any one or any combination. Thus, "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". An exception to this definition occurs only when the combination of elements, functions, steps, or operations are inherently mutually exclusive in some way.

[0033] Although not fully defined, including technical and scientific terms used herein, all terms shall have the same meaning as generally understood by those skilled in the technical field to which this specification pertains. Terms defined in commonly used dictionaries are additionally interpreted to have meanings consistent with relevant technical literature and the content presented herein. Unless otherwise defined, they shall not be over-interpreted as ideal or overly formulaic meanings.

[0034] The present invention provides a compressor housing and a rolling rotor compressor including the same. The compressor housing includes an outer housing, an inner housing, and a connecting portion. The outer housing and the inner housing are connected by the connecting portion to form a U-shaped cavity. The compressor housing of the present invention includes an outer housing and an inner housing. The cavity therebetween can be used to store excess refrigerant liquid or a mixed liquid of refrigerant and lubricating oil. However, when it is applied to a rolling rotor compressor, the inner housing is directly attached to the motor to enhance the heat exchange function, that is, the motor heats the refrigerant liquid through the inner housing to quickly discharge it from the compressor. In addition to reducing the heat generated by the motor, it can also separate the oil from the mixed liquid. The separated oil returns to the compressor through the oil return through-hole. At the same time, the structure of the double-layer housing can also reduce the noise during the operation of the compressor.

[0035] The following further elaborates on the structure of the compressor housing of the present invention and the rolling rotor compressor including the same in conjunction with the accompanying drawings and specific embodiments. It can be understood that each specific embodiment does not limit the protection scope of the present invention.

[0036] Figure 1 It is a sectional view of the compressor housing according to an embodiment of the present invention. Specifically, the compressor housing includes an outer housing 11, an inner housing 12, and a connecting portion 13. The outer housing 11 and the inner housing 12 are connected by the connecting portion 13 to form an annular U-shaped cavity C. Here, the outer housing 11 can be regarded as the housing of a conventional compressor, which can be connected to the upper housing and the lower housing to form a cavity for accommodating the compressor motor and the pump body assembly. The annular U-shaped cavity between the inner housing and the outer housing is a semi-closed cavity, which can be used to store excess refrigerant liquid or a mixed liquid of refrigerant and lubricating oil above the upper end surface of the iron core of the motor. The distance between the outer housing 11 and the inner housing 12 is L, satisfying: 3 mm ≤ L ≤ 18 mm. That is, preferably, the width of the U-shaped cavity C is between 3 mm and 18 mm, and can be further determined according to the specific model or structure of the compressor.

[0037] Since the advantages of the compressor housing of the present invention can be better elaborated when it is applied to a rolling rotor compressor, Figure 2 and Figure 3FIG. 0 is a schematic structural view and a sectional view of a rolling rotor compressor according to an embodiment of the present invention. Specifically, the rolling rotor compressor includes the compressor housing and the motor. The motor includes a stator 2 and a rotor 3. Of course, the compressor further includes components such as a crankshaft 4 and an upper cylinder head 5. The inner layer housing 12 is disposed between the upper end surface of the iron core of the stator 2 and the upper end surface of the upper cylinder head 5 of the compressor. The surface of the inner layer housing 12 facing away from the U-shaped inner cavity C is in interference fit with the stator.

[0038] For the above rolling rotor compressor, before low-temperature startup, a part of the migrated liquid refrigerant can be stored in the semi-closed U-shaped inner cavity C to reduce the startup load of the rotor / crankshaft. After low-temperature startup, the inner layer housing is directly attached to the motor to enhance the heat exchange function, and the heat generated by the motor is used to heat the excess refrigerant stored in the U-shaped inner cavity C, so that the refrigerant is quickly discharged from the compressor cavity. In addition to reducing the heat generated by the motor, the structure of the double-layer housing can also reduce the noise during the operation of the compressor.

[0039] Furthermore, the housing may further include at least one oil return through hole. Figures 4 to 6 FIGS. 8-14 are enlarged schematic views of the connection part of the compressor housing according to different embodiments of the present invention, that is, the oil return through hole 14a can be disposed at the connection part 13 (see Figure 4 shown); the oil return through hole 14b can also be disposed on the inner layer housing 12 (see Figure 5 shown). In an embodiment where there are multiple oil return through holes, one oil return through hole 14a can be disposed at the connection part 13, and the other oil return through hole 14b is disposed on the inner layer housing 12 (see Figure 6 shown).

[0040] The provision of the oil return through hole enables the compressor housing of the present invention to not only reduce the heat generated by the motor, but also separate the mixed liquid oil. The separated oil returns to the compressor through the oil return through hole. Preferably, the aperture d of the oil return through hole satisfies: 1 mm ≤ d ≤ 3 mm. The aperture d of the oil return through hole can be determined according to the specific model or structure of the compressor, and is not limited herein.

[0041] To enhance the heat exchange function between the inner layer housing and the attached motor, the surface of the outer layer housing in the U-shaped cavity is corrugated, and / or the surface of the inner layer housing in the U-shaped cavity is corrugated, that is, the surface of the U-shaped cavity is corrugated. The corrugations can be transverse corrugations (see Figure 7 shown), and the corrugations can also be oblique corrugations (see Figure 8 shown).

[0042] The inner housing 12 is disposed between the upper end surface of the iron core of the stator 2 and the upper end surface of the upper cylinder head 5 of the compressor. In some embodiments, the height of the inner housing 12 is H, the height of the iron core of the stator 2 is L1, and the distance between the lower end surface of the iron core of the stator 2 and the upper end surface of the upper cylinder head 5 of the compressor is L2, satisfying: L1 ≤ H ≤ L1 + L2. At this time, when the oil return through hole is disposed in the inner housing 12, preferably, the oil return through hole is disposed between the lower end surface of the iron core of the stator and the upper end surface of the upper cylinder head of the compressor, so that the oil-liquid mixture can return to the bottom of the compressor through the bottom oil return through hole of the connecting portion 13 between the outer housing 11 and the inner housing 12, avoiding the situation of low oil level inside the compressor, thereby improving the reliability and service life of the compressor operation, and improving the operation efficiency of the compressor.

[0043] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present application is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claimed claim.

Claims

1. A compressor housing, characterized in that, It includes an outer shell, an inner shell and a connecting part; The outer shell and the inner shell are connected by the connecting part and form a U-shaped cavity.

2. The compressor housing according to claim 1, characterized in that, The shell further includes at least one oil return through hole.

3. The compressor housing according to claim 2, characterized in that, The oil return through hole is provided in the connecting part; and / or The oil return through hole is provided on the inner shell.

4. The compressor housing according to claim 2, characterized in that, The aperture of the oil return through hole is d, satisfying: 1mm ≤ d ≤ 3mm.

5. The compressor housing according to claim 1, characterized in that, The surface of the outer shell in the U-shaped cavity is corrugated; and / or The surface of the inner shell in the U-shaped cavity is corrugated.

6. The compressor housing according to claim 1, wherein, The distance between the outer shell and the inner shell is L, satisfying: 3mm ≤ L ≤ 18mm.

7. A rolling rotor compressor, characterized in that, It includes the compressor shell and the motor according to claim 1, and the motor includes a stator and a rotor.

8. The rolling rotor type compressor according to claim 7, characterized in that, The surface of the inner shell facing away from the U-shaped inner cavity is in interference fit with the stator.

9. The rolling rotor type compressor according to claim 7, wherein, The inner shell is arranged between the upper end surface of the iron core of the stator and the upper end surface of the upper cylinder head of the compressor.

10. The rolling rotor type compressor according to claim 7, characterized in that, The height of the inner shell is H; The height of the iron core of the stator is L1; the distance between the lower end surface of the iron core of the stator and the upper end surface of the upper cylinder head of the compressor is L2, satisfying: L1 ≤ H ≤ L1 + L2.

11. The rolling rotor type compressor according to claim 7, characterized in that, The shell further includes an oil return through hole provided in the inner shell; The oil return through hole is provided between the lower end surface of the iron core of the stator and the upper end surface of the upper cylinder head of the compressor.

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