SCROLL COMPRESSOR AND METHOD FOR ASSEMBLING SAME

Abstract

A scroll compressor having a housing composed of multiple sub-housings (12, 14, 16), comprising a motor sub-housing which is equipped with a drive motor with a stator fixed to the housing and a coaxial rotor fixed to a main shaft mounted on one side of the stator by a first main shaft bearing; a bearing sub-housing that adjoins the motor sub-housing on the side facing away from the first main shaft bearing and supports a second main shaft bearing and an orbital guide of a first scroll-type displacement device, which is eccentrically connected to the main shaft and orbits during a rotation of the main shaft and into which a second scroll-type displacement device fixed to the housing engages axially; and a housing cover which adjoins the bearing sub-housing and terminates the housing. The second scroll-type displacement device is directly connected to the bearing sub-housing.

Claims

1. A scroll compressor having a housing composed of a plurality of housing sections, comprising a motor housing section in which is configured a drive motor having a housing-fixed stator and a coaxial rotor fixed to a main shaft mounted on one side of the stator by a first main shaft bearing; a bearing housing section, which adjoins the motor housing section on the side facing away from the first main shaft bearing and which supports a second main shaft bearing as well as an orbital guide of a first spiral displacer, which is eccentrically coupled to the main shaft and orbits in response to the rotation thereof, and into which axially engages a housing-fixed, second spiral displacer; a housing cover which adjoins the bearing housing section and terminates the housing, wherein the second spiral displacer is directly connected to the bearing housing section.

2. The scroll compressor as recited in claim 1, wherein the second spiral displacer is screw fastened to the bearing housing section.

3. The scroll compressor as recited in claim 2, wherein the screw fastening is realized by a plurality of screws which extend axially through a wall of the bearing housing section and are screwed in place into threaded holes in the second spiral displacer.

4. The scroll compressor as recited in claim 1, wherein the outer wall of the bearing housing section forms an axial portion of the outer wall of the housing.

5. The scroll compressor as recited in claim 1, wherein the housing cover is fixed to the motor housing section by the bearing housing section or by screws which extend axially through the outer wall thereof.

6. The scroll compressor as recited in claim 1, wherein the contact regions between the motor housing section and the bearing housing section, on the one hand, and between the bearing housing section and the housing cover, on the other hand, are each sealed by a crimp seal.

7. A method for assembling a scroll compressor according to claim 1, comprising the steps of: providing a module in a separate process, including the bearing housing section having the preassembled, second main shaft bearing (28), the preassembled main shaft, and the rotor fixed thereto as well as the preassembled, first spiral displacer and the second spiral displacer directly connected to the bearing housing section, and rotationally driving the main shaft when the bearing housing section is fixed, measuring imbalances and balancing the module; providing the motor housing section having the preassembled stator and the preassembled first main shaft bearing and inserting the balanced module into the motor housing section, the main shaft being inserted into the first main shaft bearing, so that the rotor is positioned concentrically within the stator while maintaining an air gap; screw-fastening the housing cover to the motor housing section, the bearing housing section being sealingly clamped between the motor housing section and the housing cover.

8. The method as recited in claim 6, wherein the module is balanced by removing rotor-fixed balancing weights or by removing material therefrom.

Description

[0021] Other features and advantages of the present invention will be apparent from the following special description and drawings,

[0022] where:

[0023] FIG. 1 shows a sectional view through a scroll compressor according to the present invention in the final assembly state;

[0024] FIG. 2 is a sectional view of the scroll compressor of FIG. 1 in a 90 offset sectional plane;

[0025] FIG. 3 is a sectional view of the core module of the scroll compressor of FIGS. 1 and 2.

[0026] Identical reference numerals in the figures indicate the same or analogous elements.

[0027] In a 90 offset sectional view, FIGS. 1 and 2 show a scroll compressor 10 according to the present invention. The housing of scroll compressor 10 is composed of three housing sections, namely a motor housing section 12, a bearing housing section 14 and a housing cover 16. As is apparent from FIG. 2, the mentioned housing sections are fixed to one another by long screws 18 in the embodiment shown. Long screws 18 thereby extend through the outer walls of housing cover 16 and of bearing housing section and are screwed into the corresponding thread in motor housing section 12. In this manner, bearing housing section 14 is clampingly held between motor housing section 12 and housing cover 16. In a manner not shown in greater detail, the interfaces between the individual housing sections are each sealed by a crimp seal.

[0028] Positioned within motor housing section 12 is an electric motor, whose stator 20 is housing-fixed, and whose rotor 22 is fixed on a concentrically mounted main shaft 24, so that it is pivotally mounted within stator 20. The mounting support of main shaft 24 in motor housing section 12 is implemented by a first main shaft bearing 26, which is provided as a floating bearing at the closed side (on the left in FIGS. 1 and 2) of motor housing section 12. A second main shaft bearing 28 is provided in bearing housing section 14, into which main shaft 24 extends.

[0029] At the front end thereof, main shaft 24 has an eccentric coupling 30 having an orbiting, first spiral displacer 32. To ensure an orbiting motion during rotation of main shaft 24, first spiral displacer 32 is guided in corresponding guides 34 in bearing housing section 14, and spiral rib thereof extends axially into the spiral rib of a stationary, second spiral displacer 36. Second spiral displacer 36 is directly connected by short screws 38 to bearing housing section 14.

[0030] This results in the option of preassembling a module 100, which forms the principal part of the scroll connector and is shown separately in FIG. 3. All essential adjustment and balancing work may be performed in a separate process on this module 100. Adjusted and balanced module 100 may then be inserted into motor housing section 12, which is preassembled to include stator 20 and first main shaft bearing 26, and, following placement of housing cover 16, fixed by long screws 18. In the illustrated specific embodiment, housing cover 16, as an essential functional unit, accommodates merely pressure accumulator chamber 40 into which the gas compressed between spiral displacers 32, 36 is conveyed.

[0031] It is self-evident that the specific embodiments discussed in the special description and shown in the figures only represent illustrative exemplary embodiments of the present invention. In light of the present disclosure, a broad spectrum of possible variations is made available to one skilled in the art. In particular, it is also conceivable to configure bearing housing section 14 as an inner housing that is arched over radially outwardly in the axial direction by motor housing section 12 and/or by housing cover 16, which then abut directly against one another. In this embodiment, it is possible to dispense with an interface to be sealed between the housing sections. On the other hand, in terms of the radial installation space, this variant is less favorable than that shown in FIGS. 1-3.

LIST OF REFERENCE NUMERALS

[0032] 10 scroll compressor

[0033] 12 motor housing section

[0034] 14 bearing housing section

[0035] 16 housing cover

[0036] 18 long screw

[0037] 20 stator

[0038] 22 rotor

[0039] 24 main shaft

[0040] 26 first main shaft bearing

[0041] 28 second main shaft bearing

[0042] 30 eccentric coupling

[0043] 32 first spiral displacer

[0044] 34 guide

[0045] 36 second spiral displacer

[0046] 38 short screw

[0047] 40 pressure accumulator chamber