JP2021513625A - Scroll compressor and how to assemble it - Google Patents

Abstract

The present invention relates to a scroll compressor (10) comprising a housing composed of a plurality of partial housings (12, 14, 16), wherein the scroll compressor includes a partial motor housing (12) and a partial motor housing (12). ) Is arranged, and the drive motor is on the stator (20) fixed to the housing and the main shaft (24) supported on one side of the stator (20) by the first main shaft bearing (26). It features a rotor (22) coaxially fixed to, and includes a partial bearing housing (14), which is on the opposite side of the first spindle housing (26). The track guide (34) of the first spiral displacer (32), which is connected to the partial motor housing (12) and is eccentrically coupled to the second spindle bearing (28) and its rotational motion. A second spiral displacer (36) fixedly arranged to the housing engages with the first spiral displacer (32) in the axial direction, and is connected to the partial bearing housing (14). Includes a housing cover (16) that closes the housing. The present invention is characterized in that a second spiral displacer (36) is directly coupled to a partial bearing housing (14).

Description

The present invention relates to a scroll compressor comprising a housing comprising a plurality of partial housings. Here this scroll compressor is
-Includes a partial motor housing, the drive motor is located within the partial motor housing, and the drive motor is on a stator fixed to the housing and a spindle supported on one side of the stator by a first spindle bearing. Equipped with a rotor fixed coaxially,
-Includes a partial bearing housing, which is connected to the partial motor housing on the opposite side of the first spindle bearing and eccentrically coupled to the second spindle bearing during its rotation. It serves as the orbital guide of the first spiral displacer that moves in orbit, and the second spiral displacer fixedly arranged to the housing engages with the first spiral displacer in the axial direction.
Includes a housing cover that closes the housing, connecting to the partial bearing housing.

The present invention further relates to a method of assembling such a scroll compressor.

This type of scroll compressor is known from DE 11 2014 003 869 T5.

Scroll compressors are commonly known to those of skill in the art for compressing gases, especially gaseous refrigerants. Scroll compressors are commonly used as compressors for cooling equipment and especially for automobile air conditioning equipment. The basic function of the scroll compressor is based on the special interaction of the two spiral displacers. The spiral displacer is essentially composed of a base plate, from which spiral ribs rise. Two such spiral displacers with correspondingly shaped spiral ribs are positioned opposite each other such that the spiral ribs are axially engaged with each other. Here, one of the spiral displacers is fixed and assembled to the housing. Another spiral displacer performs a so-called orbital motion, which represents a circular motion around the central axis. The compression space formed between the spiral ribs that engage with each other changes cyclically here, so that the gas is drawn into the radial outer region of the spiral displacer and is centered on the helix under continuous compression. Transported to a point. Here, in a fixed spiral displacer, a pressure relief valve that penetrates its base plate is located through which compressed gas is discharged into the accumulator chamber. From the accumulator chamber, compressed gas can be transferred for application-specific use.

A scroll connector comprising a three-part housing divided into a two-part outer housing and a one-part inner housing is known from the general literature described above. The outer housing consists of a partial motor housing and a housing cover. The partial motor housing is substantially used to house an electric motor designed as an internal rotating body with a stator fixed to the housing and a rotatable rotor. The rotor is fixed on the spindle, which is supported by the closed end of the partial motor housing in a radial bearing configured as a floating bearing. The dome-shaped housing cover is attached to the open end of the partial motor housing and screwed into the partial motor housing. The spiral displacer is located in the cavity formed by the housing cover. A fixed spiral displacer, referred to herein as a second spiral displacer, is screwed into the housing cover. The orbiting spiral displacer, referred to here as the first spiral displacer, is eccentrically coupled to a spindle protruding beyond the stator. In such areas, the spindle is supported by a second spindle bearing in a partial bearing housing formed as an internal housing in a known scroll compressor. The partial bearing housing also serves as a guide for the orbiting first spiral displacer. The partial bearing housing is sandwiched between the contact flange of the partial motor housing and the radial outer axial extension of the fixed spiral displacer. On the radial outside, this is arched on the one hand by the outer wall of the partial motor housing and on the other hand by the outer wall of the housing cover. A drawback of known scroll displacers is that their functionality, especially in relation to the precise adjustment and balance of their components, which are mutually movable, can only be inspected in their final assembled state. The readjustment that may be required in this case requires disassembly of the entire scroll displacer, which leads to costly additional work.

An object of the present invention is to improve the scroll displacer (or spiral displacer) described in the superordinate concept so that its functionality can already be inspected in the early assembly stage. Another object of the present invention is to provide a suitable assembly method.

The above problem is solved by the second spiral displacer being directly coupled to the partial bearing housing in connection with the features of the superordinate concept of claim 1.

This configuration allows a way to assemble such a scroll compressor. This method
-The module including the partial bearing housing is provided independently, and the spindle is rotationally driven with the partial bearing housing fixed, and the step of measuring the balance and imbalance of the module is included, where the partial bearing housing is included. Is a pre-installed second spindle bearing, a pre-installed spindle, a rotor fixed on the spindle, a pre-installed first spiral displacer, and a partial bearing housing. It has a second spiral displacer that is directly coupled to and
Provided a partial motor housing with a pre-installed stator and a pre-installed first spindle bearing, including the step of inserting a balanced module into the partial motor housing. Here, the spindle is inserted into the first spindle bearing and the rotor is positioned concentrically in the stator while maintaining the air gap.
-Contains a step of screwing the housing cover and the partial motor housing, where the partial bearing housing is tightly tightened between the partial motor housing and the housing cover.

A preferred embodiment of the present invention is the subject of the dependent claims.

In contrast to prior art, the fixed second spiral displacer is fixed to the partial bearing housing rather than the housing cover. This allows the construction of a module that includes two spiral displacers in their final relative positions to each other and a spindle that is coupled with a first orbiting spiral displacer and is supported within a partial bearing housing. Such modules are the core of the scroll displacer, are provided alone and can be inspected for their functionality, especially their precise adjustments, independent of other components. This can be done advantageously by tightening the partial bearing housing and rotationally driving the spindle with a temporarily connected drive motor. Here, the imbalance that occurs in some cases can be corrected directly, without the hassle of disassembling it, especially the disassembling of the housing that makes it difficult to access the component in question. is there. Particularly advantageous, i.e., in the method of the invention, such functional tests are performed with the rotor already fixed on the spindle. That is, because of its mass, the rotor already introduces a non-negligible imbalance potential in the system by itself. Therefore, it is known that a balance weight is provided on the rotor during the manufacture of the rotor. This balance weight is removed as needed within the scope of the functional test described above, or reduced by material removal. All this can be done for the single module described above prior to final assembly. The balanced module can then be inserted into the provided partial motor housing along with the stator and first spindle bearing. If the partial motor housing is properly preassembled, the rotor is automatically positioned so that it can rotate coaxially within the stator while maintaining a small air gap. The housing cover can then be placed and fixed.

The coupling according to the invention between the spiral displacer and the partial bearing housing is advantageously made by screw coupling. Particularly preferably, the screw coupling is achieved by a plurality of screws that axially penetrate the wall of the partial bearing housing and are screwed into the screw holes of the second spiral displacer. That is, in such an embodiment, the screw head faces the direction of the partial motor housing in the final assembled state. Therefore, if only the housing covers are removed from the finally assembled scroll compressor, they will not be accessible. But this is not a drawback. Because, as mentioned above, the coupling of the second spiral displacer with the partial bearing housing is done at an early assembly stage anyway for the formation of the core module described, and further after adjustment and balance adjustment. This is because no change is necessary. In this respect, the preferred orientation of the screw can be seen as an advantageous means of avoiding the decomposition of the module due to error. Another advantage of the orientation mentioned above is also in terms of installation space. This would be more disadvantageous in the case of reverse orientation of the screws, which is basically possible as well.

In a preferred configuration of the present invention, the outer wall of the partial bearing housing (overall) forms an axial portion of the wall portion of the housing. In other words, the housing outer wall of the finally assembled scroll compressor is composed of three axial portions formed (in this order) by the housing cover, the partial bearing housing and the partial motor housing. Basically, the housing cover and / or the partial motor housing arches the partial bearing housing radially outward along the axial direction, whereby the partial bearing housing is formed as the inner housing as in the prior art. Aspects are possible, but given the relationship of structural space in the radial direction, this is not more advantageous than the preferred configuration of the present invention.

In either case, the partial bearing housing is advantageously secured by sandwiching the partial bearing housing between the housing cover and the partial motor housing. This is possible, in particular, by the housing cover being secured to the partial motor housing by screws that axially penetrate the partial bearing housing or its outer wall.

The joints between the individual partial housings, i.e. the contact areas between the partial motor housing and the partial bearing housing on the one hand and the contact areas between the partial bearing housing and the housing cover on the other hand, are preferably groove seals It is sealed by a combination of a groove and a seal ring). With such a seal, even a small manufacturing tolerance can be compensated. In addition, the number of groove seals, which is 2, represents a favorable compromise between ease of assembly and secure sealing.

Further features and advantages of the present invention will become apparent from the following special description and drawings.

A cross-sectional view of the scroll compressor of the present invention in the final assembled state is shown. A cross-sectional view of the scroll compressor of FIG. 1 in a cross section offset by 90 ° is shown. The cross-sectional view of the core module of the scroll compressor of FIG. 1 and FIG. 2 is shown.

The same reference numbers in the figure indicate the same or similar elements.

1 and 2 show the scroll compressor 10 according to the present invention in a cross-sectional view shifted by 90 °, respectively. The housing of the scroll compressor 10 is composed of three partial housings, that is, a partial motor housing 12, a partial bearing housing 14, and a housing cover 16. As can be seen from FIG. 2, the above-mentioned partial housings are fixed to each other by long screws 18 in the illustrated embodiment. The long screw 18 now penetrates the outer walls of the housing cover 16 and the partial bearing housing 14 and is screwed into the corresponding screw hole of the partial motor housing 12. In this way, the partial bearing housing 14 is held in a state of being sandwiched between the partial motor housing 12 and the housing cover 16. The interfaces between the individual partial housings are each sealed by a groove seal in a manner not shown in detail.

The electric motor is located within the partial motor housing 12, its stator 20 is fixed to the housing, and its rotor 22 is fixed to a spindle 24 concentrically supported, whereby this is inside the stator 20. It is arranged to rotate in. The spindle 24 is supported in the partial motor housing 12 via the first spindle bearing 26, and the first spindle bearing 26 is provided as a floating bearing on the closed side of the partial motor housing 12 (left side of FIGS. 1 and 2). Have been placed. The second spindle bearing 28 is arranged in the partial bearing housing 14, and the spindle 24 extends therein.

The spindle 24 has an eccentric coupling 30 at its front end provided with a first spiral displacer (spiral repellent) 32 that orbits. The first spiral displacer 32 is guided within the corresponding guide member 34 of the partial bearing housing 14 to ensure orbital motion as the spindle 24 rotates. The spiral ribs of the first spiral displacer 32 project axially into the spiral ribs of the fixed second spiral displacer 36. The second spiral displacer 36 is directly coupled to the partial bearing housing portion 14 by a short screw 38.

This makes it possible to pre-assemble the modules 100 individually shown in FIG. 3, which form the core portion of the scroll coupling. All important adjustment and balancing tasks can be performed independently in this module 100. Next, the adjusted and balanced module 100 is inserted into the partial motor housing 12 in which the stator 20 and the first spindle bearing 26 are pre-assembled, the housing cover 16 is placed, and then the long screw 18 Can be fixed using. In the illustrated embodiment, the housing cover 16 which is an important functional unit has only the accumulator chamber 40 in which the compressed gas is guided between the spiral displacers 32 and 36.

Of course, the embodiments discussed and illustrated in the particular description above are merely exemplary examples of the present invention. To the extent of the disclosure herein, those skilled in the art will be presented with a wide range of possible variations. In particular, it is conceivable to configure the partial bearing housing 14 as an inner housing. Such an inner housing will be arched along the axial direction by a partial motor housing 12 and / or a housing cover 16 that are in direct contact with each other from the outside in the radial direction. In such a configuration, the joint to be sealed between the partial housings can be omitted. On the other hand, such a change mode is less preferable in terms of the radial configuration space than the change mode shown in FIGS. 1 to 3.

10 Scroll Compressor 12 Partial Motor Bearing 14 Partial Bearing Housing 16 Housing Cover 18 Long Screw 20 Stator 22 Rotor 24 Spindle 26 First Spindle Bearing 28 Second Spindle Bearing 30 Eccentric Coupling 32 First Spiral Displacer 34 Guide 36 2 spiral displacer 38 short screw 40 accumulator chamber

Claims (8)

A scroll compressor (10) having a housing composed of a plurality of partial housings (12, 14, 16).
A partial motor housing (12) is included, and a drive motor is arranged in the partial motor housing (12). The drive motor includes a stator (20) fixed to the housing and a first spindle bearing. It is provided with a rotor (22) coaxially fixed on a spindle (24) supported on one side of the stator (20) by (26).
The partial bearing housing (14) is included, and the partial bearing housing (14) is connected to the partial motor housing (12) on the side opposite to the first spindle bearing (26), and the second spindle housing (14) is included. It carries a spindle bearing (28) and a track guide member (34) of a first spiral displacer (32) that is eccentrically coupled to the spindle (24) and that orbits when the spindle rotates. A second spiral displacer (36) fixedly arranged to the housing is axially engaged in the first spiral displacer (32).
In a scroll compressor (10) that is connected to the partial bearing housing (14) and includes a housing cover (16) that closes the housing.
The second spiral displacer (36) is directly coupled to the partial bearing housing (14).
A scroll compressor (10) comprising a housing comprising a plurality of partial housings (12, 14, 16). The scroll compressor (10) according to claim 1, wherein the second spiral displacer (36) is screw-coupled to the partial bearing housing (14). The screw coupling is achieved by a plurality of screws (38) screwed into the screw holes of the second spiral displacer (36), axially penetrating the wall portion of the partial bearing housing (14). The scroll compressor according to claim 2. The scroll compressor (10) according to any one of claims 1 to 3, wherein the outer wall of the partial bearing housing (14) forms an axial portion of the outer wall of the housing. The housing cover (16) is fixed to the partial motor housing (12) by a screw (18) that axially penetrates the partial bearing housing (14) or its outer wall, according to claims 1 to 4. The scroll compressor (10) according to any one of the above. On the one hand, the contact area between the partial motor housing (12) and the partial bearing housing (14) and on the other hand, the contact area between the partial bearing housing (14) and the housing cover (16) are grooves. The scroll compressor (10) according to any one of claims 1 to 5, which is sealed by a seal. A method of assembling the scroll compressor (10) according to any one of claims 1 to 6.
The method is
A module (100) including the partial bearing housing (14) is provided independently, and the partial bearing housing (14) is previously incorporated with the second spindle bearing (28). The built-in spindle (24), the rotor (22) fixed on the spindle (24), the pre-installed first spiral displacer (32), and the partial bearing housing. The second spiral displacer (36) which is directly coupled to (14) is provided, and the spindle (24) is rotationally driven in a state where the partial bearing housing (14) is fixed to drive the module. It includes the step of measuring the balance and the imbalance of (100).
Provided is the partial motor housing (12) including the pre-installed stator (20) and the pre-installed first spindle bearing (26), the module (balanced). The step of inserting the 100) into the partial motor housing (12) is included, at which time the spindle (24) is inserted into the first spindle bearing (26) and the rotor (22). Are concentrically positioned within the stator (20) to maintain the air gap.
A step of screwing and connecting the housing cover (16) and the partial motor housing (14) is included, wherein the partial bearing housing (14) is the partial motor housing (12) and the housing cover (14). The method for assembling the scroll compressor (10) according to any one of claims 1 to 6, which is tightly tightened with 16). The method of claim 7, wherein the balance of the module (100) is maintained by removing the balance weight fixed to the rotor or removing the material of the balance weight.

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