Driving assembly for totally enclosed scroll compressor and implementation method

Abstract

The application provides a driving assembly for a totally-enclosed scroll compressor and a realization method, and relates to the technical field of totally-enclosed scroll compressors. The driving assembly comprises an external shell, upper and lower fixed supports arranged in the external shell, a driving motor stator, a driving output shaft and a driving motor rotor fixed on the driving output shaft. The driving output shaft rotates around a fixed axis under the limitation of an upper rotating positioning surface of the upper fixed support and a lower rotating positioning surface of the lower fixed support. The external shell is provided with a first preset pit, and the top of the first preset pit is provided with a preset thin wall part. The upper and lower fixed supports are correspondingly provided with second preset pits, and the edges of the second preset pits are provided with closed continuous circular edges. The application mainly realizes high-precision assembly of the driving assembly through an effective connection mode of the upper and lower fixed supports and the external shell without improving or even reducing the machining precision of parts.

Description

Technical Field

[0001] This invention relates to the field of fully enclosed scroll compressor technology, and more particularly to a drive assembly and implementation method for a fully enclosed scroll compressor. Background Technology

[0002] A fully enclosed scroll compressor is a type of positive displacement compressor. It consists of a fixed scroll component with involute blades and a moving scroll component with involute blades that meshes with the fixed scroll component. The blades of the fixed and moving scroll components mesh to form multiple cavities with variable volumes, thereby compressing the working fluid, such as refrigerant or other gases. Typically, after the working fluid is introduced into the variable cavities through the suction port, the moving scroll component, driven by the drive assembly, rotates relative to the fixed scroll component, thus compressing the working fluid. During compressor operation, the upper fixed support of the drive assembly provides axial support for the moving scroll component and a mounting surface for the fixed scroll component, ensuring that the moving and fixed scroll components form multiple pairs of variable-volume cavities during compressor operation, achieving continuous compression of the working fluid. The assembly accuracy of the drive assembly is the main determinant of mechanical losses during the operation of the fully enclosed scroll compressor. Furthermore, improving the assembly accuracy of the drive assembly, the machining accuracy of its components, and the complexity of the equipment used to assemble the drive assembly constitute significant parts of the cost of the fully enclosed scroll compressor.

[0003] Fully enclosed scroll compressors require improved assembly precision of the drive assembly without increasing or decreasing the machining accuracy of components. Simultaneously, a relatively economical connection method between the fixed support and the housing is needed to improve the mechanical efficiency and reduce costs. A suitable option is a large-clearance fit between the fixed support and the housing, using gas metal arc welding (MAG). Currently, there are two main methods for fixing the outer housing to the upper and lower fixed supports in the drive assembly: one is through plastic deformation of the outer housing; the other is welding between the outer housing and the support, primarily using either gas metal arc welding (TIG) or gas metal arc welding (MAG). When using the more efficient and lower-cost MAG welding method, the gap between the welded part of the fixed support and the outer housing needs to be addressed. This is because, compared to TIG welding, MAG welding produces a significant amount of spatter and slag, requiring prevention of welding debris entering the outer housing and causing overall machine failure. To ensure the assembly precision of the drive assembly, current methods primarily focus on improving the machining precision of each component to reduce welding gaps and prevent welding debris from entering the assembly.

[0004] Therefore, this application proposes a drive assembly for a fully enclosed scroll compressor that achieves high-precision assembly of the drive components using MAG welding. Summary of the Invention

[0005] This invention provides a drive assembly and implementation method for a fully enclosed scroll compressor. The main advantage of this invention is that it achieves high-precision assembly of the drive assembly through an effective connection between the fixed support and the outer casing, without increasing or even decreasing the machining precision of the components.

[0006] The technical means employed in this invention are as follows:

[0007] A drive assembly for a fully enclosed scroll compressor includes an outer housing, an upper fixed support and a lower fixed support disposed within the outer housing, a drive motor stator, a drive output shaft, and a drive motor rotor fixed to the drive output shaft; the drive output shaft rotates around a fixed axis under the constraint of the upper rotational positioning surface of the upper fixed support and the lower rotational positioning surface of the lower fixed support.

[0008] The outer shell is provided with a first pre-set sinkhole, and the top of the first pre-set sinkhole retains a pre-set thin-walled portion; the upper fixed support is correspondingly provided with a second pre-set sinkhole, and the edge of the second pre-set sinkhole is pre-set with a closed circular edge; the thin-walled portion is pierced by the piercing tip of the piercing punch, so that the thin-walled portion is stretched towards the second pre-set sinkhole to form a stretching protrusion and an open hole, and the piercing force is controlled to press the stretching protrusion and the closed circular edge of the upper fixed support together to form a closed annular surface.

[0009] Furthermore, the axis of the upper rotating positioning surface of the upper fixed support is coaxial with the axis of the lower rotating positioning surface of the lower fixed support; the upper fixed support is provided with an upper assembly positioning surface coaxial with its upper rotating positioning surface; the lower fixed support is provided with a lower assembly positioning surface coaxial with its lower rotating positioning surface, and the axes of the upper assembly positioning surface and the lower assembly positioning surface are coaxial.

[0010] Furthermore, the first pre-cast sinkhole and the second pre-cast sinkhole are cylindrical or conical.

[0011] This invention also provides a method for implementing a drive assembly for a fully enclosed scroll compressor, comprising:

[0012] MAG welding is performed after the closed toroidal surface is formed. The slag produced by the welding wire is blocked by the closed toroidal surface, thus completing the welding and fixing.

[0013] Furthermore, before the puncture step, the assembly positioning surfaces of the upper and lower fixed supports are made coaxial by using an assembly fixture, ensuring that the gap between the inner wall of the stator and the outer wall of the rotor is δ2, and the gaps between the upper and lower fixed supports and the outer shell are δ1 and δ3, respectively.

[0014] Furthermore, after MAG welding, a columnar metal connector is formed at the weld site to enclose the interior of the component and withstand axial and circumferential loads.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. This invention provides a method for achieving high component assembly accuracy with low component machining accuracy in drive components for fully enclosed scroll compressors, effectively reducing production costs.

[0017] 2. This invention provides a MAG welding method for drive components of fully enclosed scroll compressors, which reduces the cycle time during component assembly and improves production efficiency.

[0018] 3. The structure provided in this invention effectively prevents welding foreign objects from entering the drive assembly of the fully enclosed scroll compressor, thereby improving the reliability of the assembly. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the driving component of the present invention.

[0021] Figure 2 for Figure 1 A magnified view of the structure before welding at point I.

[0022] Figure 3 for Figure 2 A schematic diagram of the pretreatment of each welding point before welding.

[0023] Figure 4 for Figure 3 A schematic diagram of the structure after welding at each welding point.

[0024] Figure 5 This is a schematic diagram of the columnar metal connector formed after welding in this embodiment.

[0025] Figure 6 This is a schematic diagram of the closed circular edge structure with a slope in this embodiment.

[0026] Figure 7 This is a schematic diagram of the second pre-set sinkhole in this embodiment, which is a conical structure.

[0027] Figure 8 This is a schematic diagram of the first pre-set sinkhole in this embodiment, which is a conical structure.

[0028] In the diagram: 1000, outer shell; 1010, cylindrical first pre-set pit; 1011, conical first pre-set pit; 1020, thin-walled section; 1021, thin-walled section with pre-drilled holes; 1030, tension protrusion; 1040, open hole; 1050, closed annular surface; 2000, upper fixed support; 2010, upper assembly positioning surface; 2020, upper rotary positioning surface; 2030, cylindrical second pre-set pit; 2031, closed circular edge; 2032. Closed circular edge with sloping edge; 2033. Conical second pre-set pit; 3000. Drive motor stator; 3010. Stator inner wall; 4000. Drive motor rotor; 4010. Rotor outer wall; 5000. Drive output shaft; 6000. Lower fixed support; 6010. Lower assembly positioning surface; 6020. Lower rotation positioning surface; 7000. Puncture punch; 7010. Puncture tip; 8000. Welding wire; 9000. Columnar metal connector. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0033] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0034] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0035] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0036] Example 1:

[0037] like Figure 1-5 As shown, the present invention provides a drive assembly and implementation method for a fully enclosed scroll compressor. The drive assembly includes an upper fixed support 2000, a lower fixed support 6000, a drive motor stator 3000, and an outer housing 1000 connecting the upper fixed support 2000, the lower fixed support 6000, and the drive motor stator 3000. It also includes a drive motor rotor 4000 fixed together with a drive output shaft 5000. The drive output shaft 5000 rotates around a fixed axis under the constraint of the upper rotation positioning surface 2020 of the upper fixed support 2000 and the lower rotation positioning surface 6020 of the lower fixed support 6000. At the same time, the inner wall 3010 of the stator and the outer wall 4010 of the rotor should maintain a certain gap δ2 (generally with a minimum average value of 0.4 mm) during rotation.

[0038] Based on the functions to be achieved by this component, the following installation accuracy requirements apply: the axis of the upper rotating positioning surface 2020 of the upper fixed support 2000 and the axis of the lower rotating positioning surface 6020 of the lower fixed support 6000 should maintain high-precision coaxiality; the inner wall 3010 of the stator of the drive motor and the outer wall 4010 of the rotor of the drive motor should maintain a certain gap δ2. To achieve the aforementioned installation accuracy requirements, the general implementation method is as follows: the upper fixed support 2000 is provided with an upper assembly positioning surface 2010 coaxial with its upper rotating positioning surface 2020; the lower fixed support 6000 is provided with a lower assembly positioning surface 6010 coaxial with its lower rotating positioning surface 6020. During the assembly process, the assembly fixture or equipment ensures that the axes of the upper assembly positioning surface 2010 and the lower assembly positioning surface 6010 are coaxial, and the gap between the inner wall of the stator 3010 and the outer wall of the rotor 4010 is δ2. At the same time, the upper fixed support 2000, the lower fixed support 6000, and the drive motor stator 3000 are connected by the outer housing 1000. Since there are dimensional inaccuracies in each component, large gaps δ1 and δ3 (generally with a maximum value of 0.4mm) are provided between the upper fixed support 2000 and the lower fixed support 6000 and the outer housing 1000 to accommodate the accumulation of dimensional inaccuracies in each component.

[0039] like Figure 2 As shown, after each component is precisely positioned by the assembly fixture or equipment, before the MAG welding connects the outer housing 1000 and the upper fixed support 2000 and the lower fixed support 6000, a structure is provided between the outer housing 1000 and the fixed support to prevent welding impurities from entering the component. The outer housing 1000 is provided with a pre-set cylindrical first pre-set recess 1010, and a pre-set thin-walled portion 1020 is left at the top of the first pre-set recess 1010; the upper fixed support 2000 (with... Figure 1Taking the partial enlargement part I as an example, a cylindrical second pre-set sinkhole 2030 is pre-set, and a closed circular edge 2031 is pre-set on the edge of the second pre-set sinkhole 2030. The structure and welding method of the lower fixed support 6000 are the same as those of the upper fixed support 2000.

[0040] like Figure 3 As shown, before MAG welding, the thin-walled portion 1020 is punctured by an external puncturing tip 7010 and a certain taper punch 7000, causing the thin-walled portion 1020 to generate a tensile protrusion 1030 and an open hole 1040 in the direction of the cylindrical second pre-set deep pit 2030. Under the control of a certain force, the tensile protrusion 1030 contacts the closed circular edge 2031 to form a closed annular surface 1050.

[0041] like Figure 4 As shown, during MAG welding, welding impurities generated by welding wire 8000 during the MAG welding process cannot enter due to the presence of the closed annular surface 1050 formed in the previous step. Figure 1 The interior of the component shown.

[0042] like Figure 5 As shown, this is the basic shape of each MAG welding point after the component is formed, welded into a columnar metal connector 9000. The columnar metal connector 9000 bears the axial and circumferential loads generated during operation and encloses the interior of the component.

[0043] Example 2: As Figure 6 As shown, the closed circular edge 2031 of the cylindrical second pre-set sinkhole 2030 can be replaced with a closed circular edge 2032 with a slope, and the thin-walled portion 1020 can be replaced with a thin-walled portion 1021 with a reserved small hole, which can provide a smaller piercing force and form a more reliable closed annular surface 1050.

[0044] Example 3: As Figure 7 As shown, the cylindrical second pre-sinking pit 2030 can be replaced with the conical second pre-sinking pit 2033.

[0045] Example 4: Figure 8 As shown, the cylindrical first pre-set sinkhole 1010 of the optional outer shell 1000 can be replaced with a conical first pre-set sinkhole 1011.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of implementing a drive assembly for a hermetic scroll compressor, characterized in that, The application relates to a driving motor stator, a driving output shaft and a driving motor rotor fixed on the driving output shaft; the driving output shaft rotates around a fixed axis under the limitation of an upper rotating positioning surface of the upper fixed support and a lower rotating positioning surface of the lower fixed support; Wherein, the outer shell is provided with a first preset pit, the top of the first preset pit is provided with a preset thin wall part; the upper fixed support is correspondingly provided with a second preset pit, and the edge of the second preset pit is provided with a closed round edge; the thin wall part is stretched to the direction of the second preset pit to form a stretching protrusion and an open hole by piercing the thin wall part with the piercing tip of a piercing punch, the stretching protrusion is pressed against the closed round edge of the upper fixed support by controlling the piercing force to form a closed ring surface; after the closed ring surface is formed, MAG welding is carried out, the welding slag generated by the welding wire is blocked by the closed ring surface to complete the welding fixation; after the MAG welding, a columnar metal connecting part is formed at the welding position, which is used for sealing the inside of the assembly and bearing axial and circumferential loads.

2. The method of implementing the drive assembly for a totally-enclosed scroll compressor according to claim 1, characterized in that, The axis of the upper rotating positioning surface of the upper fixed support is coaxially arranged with the axis of the lower rotating positioning surface of the lower fixed support; the upper fixed support is provided with an upper assembly positioning surface coaxial with the upper rotating positioning surface; the lower fixed support is provided with a lower assembly positioning surface coaxial with the lower rotating positioning surface; and the axes of the upper assembly positioning surface and the lower assembly positioning surface are coaxially arranged.

3. The method of realizing the drive assembly for the totally-enclosed scroll compressor according to claim 1, wherein The first preset pit and the second preset pit are in cylindrical or conical shapes.

4. The method of realizing the drive assembly for the totally-enclosed scroll compressor according to claim 1, wherein Before the piercing step, the assembly jigs are used to ensure that the assembly positioning surfaces of the upper fixed support and the lower fixed support are coaxial, the gap between the inner wall of the stator and the outer wall of the rotor is delta 2, the gap between the upper fixed support and the outer shell is delta 1, and the gap between the lower fixed support and the outer shell is delta 3.

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