Scroll compressor

Abstract

A scroll compressor is provided. The scroll compressor includes: a housing including a top cover at the top; the compression mechanism comprises a fixed vortex and a movable vortex, and the fixed vortex and the movable vortex are matched with each other to form a plurality of compression cavities; and the pre-deformation applying device is arranged between the top cover and the compression mechanism and is configured to be used for applying pre-compression to the top cover and the compression mechanism, so that the top cover and the compression mechanism generate a certain pre-deformation amount. According to the scroll compressor, the pre-deformation applying device is arranged between the top cover and the compression mechanism of the scroll compressor, so that the top cover and the compression mechanism generate certain pre-deformation, the deformation of the compression mechanism is kept unchanged, and the influence of the deformation of the compression mechanism on the performance and reliability of the scroll compressor is reduced.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and in particular to a scroll compressor with improved axial deformation of a compression mechanism. Background Art

[0002] The contents of this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] In the prior art, some compressor designs place the compression mechanism within a high-pressure chamber (for example, to simplify the structure and facilitate functions such as variable pressure ratio compression). Due to the pressure difference between the high-pressure chamber pressure and the compression chamber pressure of the compression mechanism, this pressure difference acts on the top of the compression mechanism (specifically, on the end plate of the fixed scroll) and the surrounding structure, causing severe deformation of the compression mechanism. This deformation of the compression mechanism, especially the axial deformation of the scroll teeth (the fixed scroll and the orbiting scroll), can lead to fluid leakage during the compression process and wear of the scroll tooth tips (the tips of the fixed scroll and the orbiting scroll), which can also cause noise problems.

[0004] In the prior art, many compressor designs increase the thickness of the scroll end plate (especially the end plate of the fixed scroll) or design reinforcing ribs on the end plate to reduce the deformation of the compression mechanism, which will lead to increased costs and affect the design of the variable pressure ratio structure, such as increasing the volume of the variable pressure ratio channel (thereby increasing the clearance volume), thereby affecting the performance of the compressor; in addition, since similar designs that enhance the rigidity of the structure cannot completely eliminate deformation, they are usually supplemented by a compensation design for the scroll tooth height (the height of the fixed scroll and the movable scroll) (for example, shortening the fixed scroll and the movable scroll), but because high and low pressure working conditions must be taken into account, only the deformation of the compression mechanism within a certain deformation range can be compensated.

[0005] Therefore, there is a need to improve the scroll compressor in the related art to solve or alleviate at least some of the problems existing in the prior art. Summary of the Invention

[0006] To solve the above problems, an object of the present invention is to provide a scroll compressor that can keep the deformation of the compression mechanism unchanged and reduce the impact of the deformation of the compression mechanism on the performance and reliability of the scroll compressor.

[0007] Another object of the present invention is to provide a scroll compressor that allows the thickness of the end plate of the fixed scroll to be designed to be smaller, thereby reducing the variable pressure ratio channel length / volume (clearance volume) and thereby improving the performance of the scroll compressor.

[0008] Another object of the present invention is to provide a scroll compressor that increases the natural frequency of a top cover of the scroll compressor, thereby reducing the radiation noise of the top cover.

[0009] The present invention provides a scroll compressor. The scroll compressor comprises:

[0010] a housing assembly comprising a top cover at the top;

[0011] A compression mechanism, the compression mechanism comprising a fixed scroll and a movable scroll, the fixed scroll and the movable scroll cooperating with each other to form a plurality of compression chambers; and

[0012] A pre-deformation applying device is provided between the top cover and the compression mechanism and is configured to apply pre-pressure to the top cover and the compression mechanism so as to cause a certain amount of pre-deformation to occur in the top cover and the compression mechanism.

[0013] In one embodiment, the pre-deformation applying device includes a plurality of pre-deformation applying blocks, which are arranged at a certain distance around the central axis of the compression mechanism, or the pre-deformation applying device includes a single pre-deformation applying block, which is arranged adjacent to the central axis of the compression mechanism.

[0014] In one embodiment, the pre-deformation applying device is an annular member having a central hole.

[0015] In one embodiment, the annular member includes an annular base and a plurality of protrusions extending axially from the annular base with radial through openings between the plurality of protrusions.

[0016] In one embodiment, the pre-deformation applying device is in contact with but not fixedly connected to the top cover and the compression mechanism.

[0017] In one embodiment, the compression mechanism is provided with an accommodating groove, and the pre-deformation applying device is embedded in the accommodating groove.

[0018] In one embodiment, the pre-deformation applying device is integral with one of the top cover and the fixed scroll, and abuts against the other of the top cover and the fixed scroll.

[0019] In one embodiment, the fixed scroll has a first end plate, and the pre-deformation applying device is disposed between the first end plate and the top cover.

[0020] In one embodiment, the first end plate is provided with a variable pressure ratio channel extending from an upper surface of the first end plate to the compression chamber.

[0021] In one embodiment, the variable pressure ratio channel is arranged closer to the radial outside of the compression mechanism than the pre-deformation applying device.

[0022] In one embodiment, the top cover is arranged on the outside of the compression mechanism and forms a high-pressure chamber on the inside of the top cover, and the compression mechanism is located in the high-pressure chamber.

[0023] In one embodiment, a supporting device is further provided between the top cover and the compression mechanism, wherein the supporting device is configured to support the fixed scroll and is provided closer to the radial outside of the compression mechanism than the pre-deformation applying device.

[0024] In one embodiment, the supporting device is configured not to apply deformation-related pre-compression to the top cover and the compression mechanism.

[0025] In one embodiment, the pre-deformation applying device enables the pre-deformation amount of the top cover to be 0.1-1.5 mm, and / or enables the pre-deformation amount of the first end plate of the fixed scroll to be 0.01-0.1 mm.

[0026] According to the present invention, a pre-deformation applying device is provided between the top cover and the compression mechanism of the scroll compressor, so that the top cover and the compression mechanism generate a certain amount of pre-deformation and correspondingly bear a certain amount of (axial) pre-pressure. In addition, in the present invention, the pre-deformation applying device is appropriately constructed according to the operating pressure range of the scroll compressor so that the operating pressure (the pressure of the discharged fluid in the high-pressure chamber) does not exceed the pressure (pre-pressure) corresponding to the pre-deformation amount. As a result, during the operation of the scroll compressor, the deformation of the compression mechanism (especially the fixed scroll and the orbiting scroll) remains unchanged, and the compression mechanism does not generate different deformations due to different pressure conditions. Therefore, the deformation compensation of the scroll teeth (fixed scroll and orbiting scroll) by a specific amount (specific height) can eliminate the impact of the deformation of the compression mechanism caused by the axial pressure difference on the compressor, thereby reducing the impact of the deformation of the compression mechanism on the performance and reliability of the scroll compressor. In addition, the thickness of the scroll end plate (especially the end plate of the fixed scroll) can be designed to be smaller, thereby reducing the length / volume (clearance volume) of the variable pressure ratio channel and improving the performance of the scroll compressor. In addition, the pre-deformation applying device can support the top cover of the scroll compressor, so that the natural frequency of the top cover is increased, thereby reducing the radiation noise of the top cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The foregoing and further features and characteristics of the present invention will become more apparent from the following detailed description with reference to the accompanying drawings, which are provided by way of example only and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals are generally used to indicate the same parts, and in the drawings:

[0028] Figure 1 is a longitudinal sectional view showing a scroll compressor according to a first embodiment of the present invention;

[0029] Figure 2 is a longitudinal sectional view showing a portion of the scroll compressor according to the first embodiment of the present invention, showing components such as a fixed scroll, a movable scroll, a top cover, and a pre-deformation applying device;

[0030] Figure 3 is a perspective view showing an integrated component of a fixed scroll and a pre-deformation applying device of a scroll compressor according to a first embodiment of the present invention;

[0031] Figure 4 It shows Figure 3 A three-dimensional cross-sectional view of an integrated piece of a fixed vortex and a pre-deformation applying device;

[0032] Figure 5 It shows Figure 3 A planar cross-sectional view of an integral part of a fixed vortex and a pre-deformation applying device;

[0033] Figure 6 is a longitudinal sectional view showing a portion of components of a scroll compressor according to a second embodiment of the present invention, showing components such as a fixed scroll, a movable scroll, a top cover, and a pre-deformation applying device;

[0034] Figure 7 is a perspective view showing an assembly of a fixed scroll and a pre-deformation applying device of a scroll compressor according to a second embodiment of the present invention;

[0035] Figure 8 is a perspective view showing a pre-deformation applying device for a scroll compressor according to a second embodiment of the present invention;

[0036] Figure 9 It shows Figure 7 A planar sectional view of an assembly of a fixed vortex and a pre-deformation applying device;

[0037] Figure 10 is a longitudinal sectional view showing a portion of components of a scroll compressor according to a third embodiment of the present invention, showing components such as a fixed scroll, a movable scroll, a top cover, and a pre-deformation applying device;

[0038] Figure 11 is a perspective view showing an assembly of a fixed scroll and a pre-deformation applying device of a scroll compressor according to a third embodiment of the present invention; and

[0039] Figure 12 It shows Figure 11 A planar sectional view of an assembly of a fixed vortex and a pre-deformation applying device. DETAILED DESCRIPTION

[0040] Exemplary embodiments of the present invention will now be described more fully with reference to the accompanying drawings.

[0041] Exemplary embodiments are provided herein so that the present invention will be exhaustive and will convey the scope more comprehensively to those skilled in the art. Many specific details such as examples of specific components, devices and methods have been described to provide a thorough understanding of each embodiment of the present invention, but these specific details should not be construed as limiting the scope of the present invention. It will be clear to those skilled in the art that, without being limited to the specifically disclosed details, exemplary embodiments can be implemented in many different forms. In some exemplary embodiments, well-known processes, well-known device structures and well-known technologies are not described in detail.

[0042] In this document, if used, the directional terms such as "upper", "lower", "top" and "bottom" are determined by the positions shown in the drawings, for example. The use of these directional terms is intended to facilitate description and is not intended to limit the present invention.

[0043] The following will be combined Figures 1 to 12 The scroll compressor 1 according to the embodiment of the present invention will be described in detail. Figure 1 1 is a longitudinal sectional view showing a scroll compressor 1 according to a first embodiment of the present invention. Figure 2 It is a longitudinal sectional view showing a part of the components of the scroll compressor 1 according to the first embodiment of the present invention, showing components such as the fixed scroll 410, the movable scroll 420, the top cover 11 and the pre-deformation applying device (also called the pre-deformation generating device) 50. Figure 3 1 is a perspective view showing an integrated member of the fixed scroll 410 and the pre-deformation applying device 50 of the scroll compressor 1 according to the first embodiment of the present invention. Figure 4 It shows Figure 3 A three-dimensional cross-sectional view of an integral part of the fixed vortex 410 and the pre-deformation applying device 50. Figure 5 It shows Figure 3 A planar cross-sectional view of an integral piece of the fixed vortex 410 and the pre-deformation applying device 50 in FIG. Figure 6 1 is a longitudinal sectional view showing a portion of components of a scroll compressor according to a second embodiment of the present invention, wherein components such as a fixed scroll 410 ′, a movable scroll, a top cover 11 ′, and a pre-deformation applying device 50 ′ are shown. Figure 7 1 is a perspective view showing an assembly of a fixed scroll 410 ′ and a pre-deformation applying device 50 ′ of a scroll compressor according to a second embodiment of the present invention. Figure 8 1 is a perspective view showing a pre-deformation applying device 50 ′ of a scroll compressor according to a second embodiment of the present invention. Figure 9 It shows Figure 7 4 is a planar cross-sectional view of an assembly of a fixed scroll 410 ′ and a pre-deformation applying device 50 ′. Figure 101 is a longitudinal sectional view showing a portion of components of a scroll compressor according to a third embodiment of the present invention, showing components such as a fixed scroll 410 ″, a movable scroll, a top cover 11 ″, and a pre-deformation applying device 50 ″. Figure 11 1 is a perspective view showing an assembly of a fixed scroll 410 ″ and a pre-deformation applying device 50 ″ of a scroll compressor according to a third embodiment of the present invention. Figure 12 It shows Figure 11 A planar sectional view of an assembly of a fixed vortex 410" and a pre-deformation applying device 50".

[0044] like Figure 1 As shown, a scroll compressor 1 according to a first embodiment of the present invention may include a housing assembly 10, a bearing seat assembly 20, a motor assembly 30, a compression mechanism 40, and a pre-deformation applying device 50, wherein the housing assembly 10 may accommodate the bearing seat assembly 20, the motor assembly 30, the compression mechanism 40, and the pre-deformation applying device 50. In the present invention, the scroll compressor 1 may be a compressor configured to operate under multiple different pressure conditions.

[0045] like Figure 1 As shown, the housing assembly 10 can be composed of a generally cylindrical body portion 12, a top cover 11 provided at one end of the body portion, and a bottom cover 13 provided at the other end of the body portion. The top cover 11 is provided to cover the outside of the compression mechanism 40 and to form a high-pressure chamber 60 on the inside of the top cover 11 (i.e., the high-pressure working fluid compressed by the compression mechanism 40 can flow into the high-pressure chamber 60), and the compression mechanism 40 is located in the high-pressure chamber 60. In the illustrated embodiment, the top cover includes a generally flat central portion.

[0046] like Figure 1 and Figure 2As shown, the compression mechanism 40 may include a fixed scroll 410 and an orbiting scroll 420. The fixed scroll 410 includes a first end plate 411 and a fixed scroll 412 extending from the first end plate 411. The orbiting scroll 420 includes a second end plate 421 and an orbiting scroll 422 extending from the second end plate 421. When the scroll compressor 1 is in operation, the motor assembly 30 drives the orbiting scroll 420 to orbit relative to the fixed scroll 410. The orbiting scroll 422 and the fixed scroll 412 engage with each other to form a series of compression chambers therebetween, the volume of which gradually decreases from the radial outside to the radial inside. A chamber 70 is also provided in the housing assembly 10. The chamber 70 can be in fluid communication with the high-pressure chamber 60 and thus also has high pressure, so that the motor assembly 30 is also under high pressure. That is, the scroll compressor according to the present invention can be a so-called high-pressure side compressor. An intake pipe (not shown) is provided to deliver low-pressure working fluid directly to the compression chamber of the compression mechanism 40. After compression, the working fluid is discharged from the exhaust passage 414 approximately at the center of the first end plate 411 of the fixed scroll 410 into the high-pressure chamber 60, and then discharged to the outside of the compressor through an exhaust pipe (not shown). It should be noted that the present invention is not limited to the high-pressure side compressor specifically shown and described herein.

[0047] like Figures 1 to 5 As shown, the pre-deformation applying device 50 is arranged between the top cover 11 and the compression mechanism 40, specifically, between the top cover 11 and the first end plate 411 of the fixed scroll 410. The pre-deformation applying device 50 is configured to apply pre-compression (particularly, axial pre-compression) to the top cover 11 and the compression mechanism 40 (specifically, to the top cover 11 and the first end plate 411 of the fixed scroll 410) so that the top cover 11 and the compression mechanism 40 produce a certain amount of pre-deformation and are correspondingly subjected to a certain amount of pre-compression. In some embodiments, the pre-deformation applying device 50 is configured to cause the pre-deformation of the top cover 11 to be 0.1-1.5 mm, and / or to cause the pre-deformation of the first end plate 411 of the fixed scroll 410 to be 0.01-0.1 mm. In particular, in the present invention, the pre-deformation applying device 50 can be appropriately constructed according to the predetermined operating pressure range of the scroll compressor, so that the pre-deformation applying device 50 can provide appropriate pre-deformation, thereby making the pre-pressure applied to the first end plate 411 of the fixed scroll 410 exceed the maximum operating pressure (the pressure of the discharge fluid in the high-pressure chamber).

[0048] In some embodiments, the pre-deformation applying device 50 is integral with one of the top cover 11 and the fixed scroll 410 and abuts against the other of the top cover 11 and the fixed scroll 410. In this way, the formation of the pre-deformation applying device can be simplified.

[0049] In this embodiment, if Figures 1 to 5As shown, the pre-deformation applying device 50 is integral with the fixed scroll 410 and abuts against the top cover 11. However, in an embodiment of the present invention not shown, the pre-deformation applying device may also be integral with the top cover and abut against the fixed scroll.

[0050] In other embodiments of the present invention (e.g., the second and third embodiments below), the pre-deformation applying device may be a separate component from the top cover and the compression mechanism. The pre-deformation applying device is in contact with the top cover and the compression mechanism but is not fixedly connected thereto. For example, the pre-deformation applying device forms an interference fit with the top cover and the compression mechanism without being welded.

[0051] In this embodiment, if Figure 3 As shown, the pre-deformation applying device 50 includes a plurality of pre-deformation applying blocks, which are arranged at a certain (circumferential) distance around the central axis of the compression mechanism 40 (specifically, the central axis of the fixed vortex 410 of the compression mechanism 40), that is, there are gaps between the plurality of pre-deformation applying blocks, so that the compressed fluid discharged from the exhaust channel 414 can be discharged into the high-pressure chamber 60 through the gaps between the plurality of pre-deformation applying blocks. In this way, on the one hand, pre-deformation can be applied uniformly, and on the other hand, the circulation of the high-pressure working fluid can be ensured. However, in other embodiments not shown in the present invention, the pre-deformation applying device may also include a single pre-deformation applying block, which is arranged adjacent to the central axis of the compression mechanism. In this way, the structure can be made simpler while ensuring that appropriate pre-deformation can be provided.

[0052] In some embodiments, each predeformation applying block of the predeformation applying device 50 may have any suitable identical shape, such as a (circular) cylindrical shape (i.e., the cross-section of the predeformation applying block is (circular) cylindrical), rectangular, square, or arc-shaped. However, the multiple predeformation applying blocks of the predeformation applying device 50 may also have any suitable different shapes, such as any combination of cylindrical, rectangular, square, or arc-shaped shapes. In this way, the most suitable specific structure and shape of the predeformation applying block can be flexibly selected based on the specific compressor structure and the expected operating conditions of the compressor.

[0053] In this embodiment, if Figure 3 As shown, each pre-deformation applying block of the pre-deformation applying device 50 has an arc shape.

[0054] In some embodiments, the first end plate 411 of the fixed scroll 410 is provided with a variable pressure ratio channel 413 extending from the upper surface of the first end plate 411 to the compression chamber. The variable pressure ratio channel 413 is provided closer to the radial outside of the compression mechanism 40 than the pre-deformation applying device 50. Figure 2As best shown, a variable pressure ratio valve (not shown) is provided for controlling the opening / closing of the variable pressure ratio channel 413. According to the present invention, due to the use of a so-called high-pressure side compressor, it is very convenient in terms of installation space to install the variable pressure ratio mechanism including the variable pressure ratio channel and the variable pressure ratio valve, thereby being able to avoid the occurrence of over-compression by conveniently arranging the variable pressure ratio mechanism. In addition, by arranging the variable pressure ratio channel 413 to be closer to the radial outside of the compression mechanism 40 than the pre-deformation applying device 50, that is, by arranging the pre-deformation applying device 50 between the variable pressure ratio channel 413 and the exhaust channel 414, interference between the pre-deformation applying device 50 and the variable pressure ratio mechanism can be effectively avoided, and the pre-deformation applying device 50 is allowed to be arranged close to the central position so as to reliably provide appropriate pre-deformation to the compression mechanism and provide stable support to the compression mechanism.

[0055] In the present invention, a pre-deformation applying device 50 is provided between the top cover 11 and the compression mechanism 40 of the scroll compressor 1, thereby causing the top cover 11 and the compression mechanism 40 to generate a certain amount of pre-deformation and correspondingly withstand a certain amount of (axial) pre-compression force. Furthermore, in the present invention, the pre-deformation applying device 50 is appropriately configured according to the operating pressure range of the scroll compressor so that the operating pressure (the pressure of the discharged fluid in the high-pressure chamber) does not exceed the pressure (pre-compression force) corresponding to the pre-deformation amount. As a result, during the operation of the scroll compressor 1, the deformation of the compression mechanism 40 (particularly the fixed scroll 412 and the orbiting scroll 422) remains unchanged, and the compression mechanism 40 does not experience different deformations due to different pressure conditions. That is, when the compression mechanism 40 is in a shutdown state, there is no pressure difference between the high-pressure chamber 60 and the compression chamber of the compression mechanism 40. Consequently, the compression mechanism 40 (particularly the fixed scroll 412 and the orbiting scroll 422) and the top cover 11 are not subjected to the axial force applied by the high-pressure chamber 60, but only to the (original) pre-compression force F. When the compression mechanism 40 is in operation, a pressure difference exists between the high-pressure chamber 60 and the compression chamber of the compression mechanism 40. Consequently, the compression mechanism 40 (particularly the fixed scroll 412 and the orbiting scroll 422) and the top cover 11 are both subjected to an axial force Fp applied by the high-pressure chamber 60. However, due to the axial force Fp applied to the top cover 11, the preload force on the compression mechanism 40 changes from the original F to F-Fp. As a result, the net force applied to the compression mechanism 40 remains F, i.e., net force = Fp (axial force applied by the high-pressure chamber 60) + F-Fp (preload force after change) = F. Therefore, regardless of whether the compression mechanism 40 is in the shutdown state or in operation (regardless of the magnitude of Fp in the operating state—as long as Fp is not greater than F), the compression mechanism 40 (particularly the fixed scroll 412 and the orbiting scroll 422) is subjected to a substantially constant net axial force. Therefore, the deformation of the compression mechanism 40 (especially the fixed scroll 412 and the movable scroll 422) remains unchanged, and the compression mechanism 40 will not produce different deformations due to different pressure conditions. Therefore, the deformation compensation of the scroll teeth (fixed scroll and movable scroll) by a specific amount (specific height) can eliminate the influence of the deformation of the compression mechanism 40 caused by the axial pressure difference on the compressor, and can reduce the influence of the deformation of the compression mechanism 40 on the performance and reliability of the scroll compressor 1. In addition, the thickness of the scroll end plate (especially the end plate of the fixed scroll) can be designed to be smaller, thereby reducing the length / volume (clearance volume) of the variable pressure ratio channel 413 and improving the performance of the scroll compressor 1. In addition, the pre-deformation applying device 50 can support the top cover 11 of the scroll compressor 1, so that the natural frequency of the top cover 11 increases, thereby reducing the radiation noise of the top cover 11.

[0056] In some embodiments, as Figure 2 and Figure 3As shown, a support device 80 is further provided between the top cover 11 and the compression mechanism 40 (specifically, between the top cover 11 and the first end plate 411 of the fixed scroll 410). The support device 80 is configured to support (particularly, axially support) the fixed scroll 410 and is provided closer to the radially outer side of the compression mechanism 40 than the pre-deformation applying device 50. The support device 80 is configured not to apply deformation-related pre-pressure to the top cover 11 and the compression mechanism 40 (that is, not to apply pre-pressure that will cause deformation), that is, unlike the pre-deformation applying device 50, it does not cause a certain amount of pre-deformation of the top cover 11 and the compression mechanism 40, but is only used to support the fixed scroll 410, for example, to prevent the fixed scroll 410 from being displaced during use. In this way, while the pre-deformation applying device is used to provide suitable pre-deformation and axial support for the compression mechanism, the additional support device 80 is also used to provide axial support, which further ensures that the compression mechanism can obtain stable support.

[0057] Some alternative embodiments of the present invention will be described below, in which the same components will not be described repeatedly.

[0058] Figures 6 to 9 FIG. 2 shows a scroll compressor according to a second embodiment of the present invention. The difference from the scroll compressor 1 according to the first embodiment of the present invention is that: Figures 6 to 9 As shown, the pre-deformation applying device 50' is a separate component independent of the top cover 11' and the compression mechanism 40'. The pre-deformation applying device 50' is in contact with the top cover 11' and the compression mechanism 40' but is not fixedly connected. For example, the pre-deformation applying device 50' is interference-fitted with the top cover 11' and the compression mechanism 40' without welding. In this way, not only is the processing complexity caused by a fixed connection eliminated, but it is also fully ensured that the pre-deformation applying device can provide appropriate pre-deformation. Figure 8As shown, the pre-deformation applying device 50' is an annular component having a central hole, and preferably, the central axis of the annular component coincides with the central axis of the compression mechanism 40'. The pre-deformation applying device 50' has an annular base 51' and a plurality of protrusions 52' extending axially upward from the annular base 51'. The plurality of protrusions 52' are arranged at a certain distance around the central axis of the pre-deformation applying device 50' to form radial through-openings 53' between the protrusions 52', so that the compressed fluid discharged from the exhaust channel can be discharged into the high-pressure chamber through the radial through-openings 53' between the plurality of protrusions 52'. By constructing the pre-deformation applying device as a single-piece annular component, processing and installation can be simplified. Accordingly, the compression mechanism 40' is provided with a receiving groove (not shown), and the pre-deformation applying device 50' (specifically, the annular base 51' of the pre-deformation applying device 50') is embedded in the receiving groove of the compression mechanism 40'. By providing a receiving groove, the pre-deformation applying device can be reliably positioned, thereby ensuring that the pre-deformation applying device can provide appropriate pre-deformation. Similarly, the compression mechanism 40' can include a fixed scroll 410' and an orbiting scroll. The fixed scroll 410' includes a first end plate 411' and a fixed scroll 412' extending from the first end plate 411'. The orbiting scroll includes a second end plate and an orbiting scroll extending from the second end plate. The pre-deformation applying device 50' is configured to apply pre-pressure to the top cover 11' and the compression mechanism 40' (specifically, to the top cover 11" through the protrusion and to the first end plate 411' of the fixed scroll 410' through the annular base) so that the top cover 11' and the compression mechanism 40' produce a certain amount of pre-deformation. Each protrusion 52' of the pre-deformation applying device 50' can have any suitable identical shape, for example, a cylindrical shape, a rectangular shape, a square shape or an arc shape, etc. However, the multiple protrusions 52' of the pre-deformation applying device 50' can also have any suitable different shapes, for example, any combination of cylindrical shapes, rectangular shapes, square shapes or arc shapes, etc. In this embodiment, as Figure 8 As shown, each protrusion 52 ′ of the pre-deformation applying device 50 ′ has an arc shape.

[0059] Figures 10 to 12 FIG. 3 shows a scroll compressor according to a third embodiment of the present invention. The difference from the scroll compressor according to the first embodiment of the present invention is that: Figures 10 to 12 As shown, the pre-deformation applying device 50" is a separate component independent of the top cover 11" and the compression mechanism 40". The pre-deformation applying device 50" is in contact with the top cover 11" and the compression mechanism 40" but is not fixedly connected. For example, the pre-deformation applying device 50" is interference-fitted with the top cover 11" and the compression mechanism 40" without being welded. Figure 11As shown, the pre-deformation applying device 50" includes a plurality of pre-deformation applying blocks, which are arranged at a certain distance around the central axis of the compression mechanism 40". That is, there are gaps between the plurality of pre-deformation applying blocks, so that the compressed fluid discharged from the exhaust channel can be discharged into the high-pressure chamber through the gaps between the plurality of pre-deformation applying blocks. Accordingly, as shown in FIG. Figure 10 and Figure 12 As shown, the compression mechanism 40" is provided with a receiving groove (not marked), and the pre-deformation applying device 50' (specifically, the lower part of each pre-deformation applying block) is embedded in the receiving groove of the compression mechanism 40". Similarly, the compression mechanism 40" may include a fixed vortex 410" and a movable vortex. The fixed vortex 410" includes a first end plate 411" and a fixed vortex 412" extending from the first end plate 411". The movable vortex includes a second end plate and a movable vortex extending from the second end plate. The pre-deformation applying device 50" is configured to apply pre-pressure to the top cover 11" and the compression mechanism 40" (specifically, to the top cover 11" and the first end plate 411" of the fixed vortex 410") so that the top cover 11" and the compression mechanism 40" produce a certain amount of pre-deformation. Each pre-deformation applying block of the pre-deformation applying device 50" may have any suitable identical shape, such as a cylindrical shape, a rectangular shape, a square shape, or an arc shape, etc. However, the multiple pre-deformation applying blocks of the pre-deformation applying device 50" may also have any suitable different shapes, such as any combination of cylindrical shapes, rectangular shapes, square shapes, or arc shapes, etc. In this embodiment, as Figure 11 As shown, each predeformation applying block of the predeformation applying device 50 ″ has a columnar shape (particularly, a cylindrical shape).

[0060] The beneficial effects of the present invention include:

[0061] In the prior art, many compressor designs increase the thickness of the scroll end plate (especially the end plate of the fixed scroll) or design reinforcing ribs on the end plate to reduce the deformation of the compression mechanism, which will lead to increased costs and affect the design of the variable pressure ratio structure, such as increasing the volume of the variable pressure ratio channel (thereby increasing the clearance volume), thereby affecting the performance of the compressor; in addition, since similar designs that enhance the rigidity of the structure cannot completely eliminate deformation, they are usually supplemented by a compensation design for the scroll tooth height (the height of the fixed scroll and the movable scroll) (for example, shortening the fixed scroll and the movable scroll), but because high and low pressure working conditions must be taken into account, only the deformation of the compression mechanism within a certain deformation range can be compensated.

[0062] In the present invention, a pre-deformation applying device is provided between the top cover and the compression mechanism of a scroll compressor, so that the top cover and the compression mechanism generate a certain amount of pre-deformation and correspondingly withstand a certain amount of (axial) pre-pressure. Furthermore, in the present invention, the pre-deformation applying device is appropriately configured according to the operating pressure range of the scroll compressor so that the operating pressure (the pressure of the discharged fluid in the high-pressure chamber) does not exceed the pressure (pre-pressure) corresponding to the pre-deformation amount. As a result, during the operation of the scroll compressor, the deformation of the compression mechanism (particularly the fixed scroll and the orbiting scroll) remains unchanged, and the compression mechanism does not produce different deformations due to different pressure conditions. Therefore, by performing a specific amount (specific height) of shape compensation on the scroll wraps (the fixed scroll and the orbiting scroll), the deformation of the compression mechanism caused by the axial pressure difference can be eliminated, thereby reducing the impact of the deformation of the compression mechanism on the performance and reliability of the scroll compressor. Furthermore, the thickness of the scroll end plates (particularly the end plates of the fixed scroll) can be designed to be smaller, thereby reducing the length / volume (clearance volume) of the variable pressure ratio passage and improving the performance of the scroll compressor. In addition, the pre-deformation applying device can support the top cover of the scroll compressor, so that the natural frequency of the top cover is increased, thereby reducing the radiation noise of the top cover.

[0063] While exemplary embodiments of scroll compressors according to the present disclosure have been described in detail herein, it should be understood that the present disclosure is not limited to the specific embodiments described and illustrated above. The various embodiments according to the present disclosure may be used individually or in combination. Those skilled in the art will be able to make various modifications and variations to the present disclosure without departing from the spirit and scope of the present disclosure. All such modifications and variations fall within the scope of the present disclosure. Furthermore, all components described herein may be replaced by other technically equivalent components.

Claims

1. A scroll compressor comprising: A housing assembly (10), the housing assembly (10) including a top cover (11) at the top; A compression mechanism (40), the compression mechanism (40) comprising a fixed scroll (410) and a movable scroll (420), the fixed scroll (410) and the movable scroll (420) cooperating with each other to form a plurality of compression chambers; as well as A pre-deformation applying device (50) is provided between the top cover (11) and the compression mechanism (40) and is configured to apply pre-pressure to the top cover (11) and the compression mechanism (40) so as to cause the top cover (11) and the compression mechanism (40) to generate a certain amount of pre-deformation.

2. The scroll compressor according to claim 1, wherein: The pre-deformation applying device (50, 50") comprises a plurality of pre-deformation applying blocks, which are arranged at a certain distance around the central axis of the compression mechanism (40, 40"), or The pre-deformation applying device includes a single pre-deformation applying block, which is disposed adjacent to a central axis of the compression mechanism.

3. The scroll compressor according to claim 1, wherein: The pre-deformation applying device (50') is an annular component with a central hole.

4. The scroll compressor according to claim 3, wherein: The annular member comprises an annular base (51') and a plurality of protrusions (52') axially extending from the annular base, with radial through openings (53') formed between the plurality of protrusions (52').

5. The scroll compressor according to any one of claims 1 to 4, characterized in that The pre-deformation applying device (50', 50") is in contact with the top cover (11', 11") and the compression mechanism (40', 40") but is not fixedly connected.

6. The scroll compressor according to claim 5, characterized in that The compression mechanism (40', 40") is provided with an accommodating groove, and the pre-deformation applying device (50', 50") is embedded in the accommodating groove.

7. The scroll compressor according to any one of claims 1 to 4, characterized in that The pre-deformation applying device (50) is integral with one of the top cover (11) and the fixed scroll (410), and abuts against the other of the top cover (11) and the fixed scroll (410).

8. The scroll compressor according to any one of claims 1 to 4, characterized in that The fixed scroll (410, 410', 410") has a first end plate (411, 411', 411"), and the pre-deformation applying device (50, 50', 50") is arranged between the first end plate (411, 411', 411") and the top cover (11, 11', 11").

9. The scroll compressor according to claim 8, wherein: The first end plate is provided with a variable pressure ratio channel (413) extending from the upper surface of the first end plate to the compression chamber.

10. The scroll compressor according to claim 9, wherein: The variable pressure ratio channel (413) is arranged to be closer to the radial outside of the compression mechanism than the pre-deformation applying device.

11. The scroll compressor according to any one of claims 1 to 4, characterized in that The top cover is arranged on the outside of the compression mechanism and forms a high-pressure chamber (60) on the inside of the top cover, and the compression mechanism is located in the high-pressure chamber (60).

12. The scroll compressor according to any one of claims 1 to 4, characterized in that A supporting device (80) is further provided between the top cover and the compression mechanism. The supporting device (80) is configured to support the fixed scroll and is provided closer to the radial outside of the compression mechanism than the pre-deformation applying device.

13. The scroll compressor according to claim 12, wherein: The supporting device (80) is configured not to apply deformation-related pre-compression to the top cover and the compression mechanism.

14. The scroll compressor according to any one of claims 1 to 4, characterized in that The pre-deformation applying device enables the pre-deformation amount of the top cover to be 0.1-1.5 mm, and / or enables the pre-deformation amount of the first end plate of the fixed scroll to be 0.01-0.1 mm.

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