CN116950893A - Scroll compressor having a rotor with a rotor shaft having a rotor shaft with a - Google Patents

Abstract

The application relates to a scroll compressor, comprising: the compression mechanism comprises a fixed vortex and an movable vortex, the fixed vortex and the movable vortex are matched to form a series of compression cavities for compressing working fluid, and the fixed vortex comprises a fluid channel; and a floating seal provided at one side of the non-orbiting scroll to define a back pressure chamber between the floating seal and the non-orbiting scroll, the back pressure chamber being communicated with a middle pressure compression chamber among the compression chambers via a fluid passage so that the floating seal can axially float under the action of compression chamber fluid from the middle compression chamber, an air flow reversing structure being provided between the fluid passage and the floating seal, the air flow reversing structure being configured to regulate a direction of compression chamber fluid discharged from the fluid passage. The present application provides a scroll compressor that improves upon the floating seal to achieve a reliable seal.

Description

Scroll compressor having a rotor with a rotor shaft having a rotor shaft with a

Technical Field

The present application relates to scroll compressors, and more particularly, to scroll compressors having improved floating seal arrangements.

Background

Scroll compressors typically include a compression mechanism consisting of a non-orbiting scroll and an orbiting scroll, which may be of a floating non-orbiting scroll design, for example, by a non-orbiting scroll and a housing or main bearing housing for supporting the non-orbiting scroll being constructed with the aid of locating holes and bolt fit clearances to provide axial and radial compliance to the non-orbiting scroll to provide unloading possibilities for liquid-carrying startup and to accommodate machining errors.

Further, in order to isolate the high pressure side and the low pressure side of the scroll compressor and to cooperate with the axial float of the non-orbiting scroll, a floating seal is provided that is disposed within and cooperates with the annular recess of the non-orbiting scroll to form a back pressure chamber, which may be in communication with a compression chamber (commonly referred to as a medium pressure chamber) intermediate the scroll compression structures, whereby the floating seal floats under the influence of the medium pressure of the fluid in the back pressure chamber. The diaphragm separates the interior space of the scroll compressor into a high pressure side and a low pressure side, with the upper surface of the floating seal contacting and creating a contact pressure with the lower surface of the diaphragm or diaphragm seal attachment (e.g., collar) creating a face seal effect to isolate the high pressure side from the low pressure side. And, lip seals are provided on the inner and outer sides of the floating seal, respectively, to contact and seal with the radially inner annular wall and the radially outer annular wall of the annular recess (back pressure chamber), respectively, so as to isolate the back pressure chamber from the low pressure side and from the high pressure side.

Normally, after the compressor is started, a back pressure chamber on the fixed scroll introduces fluid, such as an intermediate compression chamber, to push the floating seal up evenly until the upper surface of the floating seal contacts the lower surface of the diaphragm or diaphragm seal attachment and forms an end face seal to isolate the high pressure side from the low pressure side.

However, for example, in the case of a rapid start of the compressor, the flow rate of fluid entering the back pressure chamber on the fixed scroll is too fast and instantaneously impacts on the lower surface of the floating seal to push the floating seal up, and the rising rate of each portion of the floating seal is different due to uneven stress of the lower surface thereof, so that the entire sealing structure is inclined to be stuck on both sides of the back pressure chamber, thereby causing leakage of fluid between the high pressure side, the low pressure side and the back pressure chamber to be failed in sealing.

Disclosure of Invention

It is an object of the present application to provide a reliable sealed scroll compressor by providing an air flow reversing structure between the fluid passage allowing passage of the compression chamber fluid and the floating seal for improved floating sealing.

The present application provides a scroll compressor, comprising: a compression mechanism comprising a non-orbiting scroll and an orbiting scroll, the non-orbiting scroll cooperating with the orbiting scroll to form a series of compression chambers for compressing a working fluid, the non-orbiting scroll comprising a fluid passageway; and a floating seal provided at one side of the non-orbiting scroll to define a back pressure chamber between the floating seal and the non-orbiting scroll, the back pressure chamber being communicated with a middle pressure compression chamber of the compression chambers via the fluid passage so that the floating seal can axially float under the action of a compression chamber fluid from the middle compression chamber, a gas flow reversing structure being provided between the fluid passage and the floating seal, the gas flow reversing structure being configured to regulate a direction of the compression chamber fluid discharged from the fluid passage.

Advantageously, the airflow reversing structure is configured such that the fluid passage remains normally open.

Advantageously, the fluid passage includes a discharge port in fluid communication with the back pressure chamber, and the flow reversing structure includes a baffle disposed in spaced relation to the discharge port.

Advantageously, the flow reversing structure is in the form of a cage and comprises an annular support body and a central baffle axially offset with respect to the annular support body, the annular support body and the central baffle being connected by at least one connecting arm to form a plurality of radial channels between the annular support body and the central baffle.

Advantageously, the cage is an integral component directly formed by a sheet metal process.

Advantageously, the cage further comprises a snap portion extending from the annular support body, the snap portion being snapped with a corresponding portion of the non-orbiting scroll to secure the cage to the non-orbiting scroll.

Advantageously, the fixed scroll further comprises an annular recess accommodating the floating seal and defining the back pressure chamber, a discharge port of the fluid passage is provided at a bottom of the annular recess, a counterbore is provided around the discharge port at the bottom of the annular recess, the counterbore is configured to be stepped so as to include a top inner wall surface, a top surface, a bottom surface, and a bottom inner wall surface connecting the top surface with the bottom surface, the cage further comprises a first clamping portion and/or a second clamping portion, the first clamping portion extends radially from the annular support body and a radially outer end of the first clamping portion is clamped to the bottom inner wall surface, and the second clamping portion extends radially from the annular support body and then axially extends and then radially extends so as to include an inner radial section, an axial section, and an outer radial section, the axial section being clamped to the bottom inner wall surface, a radially outer end of the outer radial section being clamped to the top inner wall surface.

Advantageously, the cage is constructed and arranged such that the central baffle is lower than the outer radial section or lower than both the outer radial section and the top surface.

Advantageously, the flow reversing arrangement is in the form of a bolt and comprises a bolt portion provided with an axial passage and a nut portion provided with a radial passage, such that the compression chamber fluid discharged from the fluid passage is reversed by first entering the axial passage and then the radial passage.

Advantageously, the radial passage comprises two mutually intersecting through holes extending through the nut portion.

Advantageously, the fixed scroll further includes an annular recess that accommodates the floating seal and defines the back pressure chamber, a discharge port of the fluid passage is provided at a bottom of the annular recess, a counter bore is provided around the discharge port at the bottom of the annular recess, the counter bore is configured to be stepped so as to include a top inner wall surface, a top surface, a bottom surface, and a bottom inner wall surface that connects the top surface with the bottom surface, and the bolt portion is screwed with the bottom inner wall surface so as to fix the bolt to the fixed scroll.

Advantageously, the non-orbiting scroll further comprises an annular recess accommodating the floating seal and defining the back pressure chamber, the discharge port of the fluid passage being provided at the bottom of the annular recess, a counterbore being provided around the discharge port at the bottom of the annular recess, the flow reversing structure being arranged in the counterbore such that the flow reversing structure does not protrude from the counterbore.

The present application provides an improved floating seal design compared to existing scroll compressors: 1) By providing a flow reversing arrangement between the fluid passage in fluid communication with the intermediate pressure compression chamber and the floating seal, the floating seal is caused to float axially in a stable manner under the influence of the compression chamber fluid regulated by the flow reversing arrangement to achieve a reliable seal even in the event of a rapid start of the compressor. Specifically, the fluid in the fluid channel in fluid communication with the medium pressure compression chamber flows through the airflow reversing structure first, and when flowing through the airflow reversing structure, the flow direction of the fluid changes, for example, from the approximately axial direction to the approximately radial direction, and then the whole medium pressure chamber is filled, so that the floating seal ring is uniformly pushed to lift up, and the functions of isolating each chamber and providing the downward pressure for the movable and fixed vortex lamination are realized. Therefore, the fluid in the compression cavity after the direction change can not directly impact the floating sealing element, so that the phenomenon that the floating sealing element is inclined and blocked due to uneven stress to cause sealing failure is avoided; 2) By means of the airflow reversing structure in the form of the retainer, the retainer can be directly formed into an integral component by a sheet metal process, so that the process is simple and the cost of accessories is reduced; 3) By means of the air flow reversing structure in the form of the bolts, the installation mode is simple, the assembly efficiency is improved, and the cost is reduced. And can also directly utilize current hexagon head bolt to punch and reform transform, further improve part machining efficiency height and reduce cost.

Drawings

The features and advantages of the present application will be more readily understood from the following detailed description of the specific embodiments, which is provided with reference to the accompanying drawings. In the drawings, like features or components are denoted by like reference numerals and the drawings are not necessarily drawn to scale and wherein:

fig. 1 is a schematic cross-sectional view of a related art scroll compressor including a non-orbiting scroll and a seal assembly disposed in an annular recess of the non-orbiting scroll.

FIG. 2 is an enlarged schematic cross-sectional view of a non-orbiting scroll and seal assembly of the scroll compressor of FIG. 1.

Fig. 3 is a schematic perspective view of a non-orbiting scroll including a flow reversing structure in the form of a cage of a scroll compressor according to one embodiment of the present application.

Fig. 4 is a schematic cross-sectional view of a non-orbiting scroll and a cage of the scroll compressor of fig. 3.

Fig. 5 is a perspective view of a retainer of the scroll compressor of fig. 3.

Fig. 6 is a schematic perspective view of a non-orbiting scroll including a flow reversing structure in the form of bolts of a scroll compressor according to another embodiment of the present application.

Fig. 7 is a schematic cross-sectional view of a non-orbiting scroll and bolts of the scroll compressor of fig. 6.

Fig. 8 is a perspective view of a bolt of the scroll compressor of fig. 6.

Fig. 9 is a schematic cross-sectional view of the bolt of fig. 6 showing the reversing channel thereof.

Fig. 10 is another schematic cross-sectional view of the bolt of fig. 6 including a reversing channel thereof.

Detailed Description

The following description of various embodiments of the application is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. The same reference numerals are used to denote the same parts throughout the various drawings, and thus the construction of the same parts will not be repeated.

The general construction and operation principle of the scroll compressor will be described first with reference to fig. 1 and 2. Scroll compressors (hereinafter sometimes referred to as compressors) generally include a housing 110. The casing 110 may include a generally cylindrical body 111, a top cover 112 disposed at one end of the body 111, a bottom cover 114 disposed at the other end of the body 111, and a partition 116 disposed between the top cover 112 and the body 111 to partition an inner space of the compressor into a high pressure side and a low pressure side. The space between the partition 116 and the top cover 112 forms a high pressure side, and the space between the partition 116, the body 111, and the bottom cover 114 forms a low pressure side. An intake joint (not shown) for sucking in fluid is provided on the low pressure side, and an exhaust joint 119 for discharging compressed fluid is provided on the high pressure side. A motor 120 composed of a stator 122 and a rotor 124 is provided in the housing 110. A drive shaft 130 is provided in the rotor 124 to drive a compression mechanism composed of a fixed scroll 150 and an movable scroll 160. Orbiting scroll 160 includes an end plate 164, a hub 162 formed on one side of the end plate, and spiral blades 166 formed on the other side of the end plate. The non-orbiting scroll 150 includes an end plate 154, helical blades 156 formed on one side of the end plate, and an annular recess 158 formed on the other side of the end plate, the annular recess including a radially outer sidewall and a radially inner sidewall. An exhaust port 159 is formed at a substantially central position of the end plate. The space around the exhaust port 159 also constitutes the high pressure side. A series of compression chambers C1, C2, and C3, whose volumes gradually decrease from the radially outer side to the radially inner side, are formed between the spiral vane 156 of the fixed scroll 150 and the spiral vane 166 of the movable scroll 160. Wherein the radially outermost compression chamber C1 is at suction pressure and the radially innermost compression chamber C3 is at discharge pressure. The intermediate compression chamber C2 is between the suction pressure and the discharge pressure and is thus also referred to as the intermediate pressure chamber.

One side of the orbiting scroll 160 is supported by an upper portion (i.e., a supporting portion) of the main bearing housing 140, and one end of the driving shaft 130 is supported by a main bearing provided in the main bearing housing 140. An eccentric crank pin 132 is provided at one end of the drive shaft 130, and an unloading bushing is provided between the eccentric crank pin 132 and a hub 162 of the orbiting scroll 160. By the driving of the motor 120, the orbiting scroll 160 translationally orbits with respect to the non-orbiting scroll 150 (i.e., the central axis of the orbiting scroll 160 orbits around the central axis of the non-orbiting scroll 150, but the orbiting scroll 160 itself does not orbit around its central axis) to achieve compression of the fluid. The translational rotation is achieved by an oldham ring provided between the fixed scroll 150 and the movable scroll 160. The fluid compressed by the fixed scroll 150 and the movable scroll 160 is discharged to the high pressure side through the discharge port 159.

To prevent the high pressure side fluid from flowing back to the low pressure side via the exhaust port 159 under certain conditions, a one-way valve or exhaust valve 190 may be provided at the exhaust port 159, which may be a variable volume ratio valve, for example, to allow early exhaust at low compression ratios for some lower discharge and suction pressure ratios, to avoid loss of power consumption from over-compression of the refrigerant, allowing the scroll compressor to remain energy efficient over a wider range of operation.

The non-orbiting scroll 150 is provided with a positioning hole 151 and the main bearing housing 140 is provided with a bolt 141 for passing through the positioning hole 151, the positioning hole 151 and the bolt 141 being configured to form an axial gap and a radial gap therebetween such that axial flexibility and radial flexibility are provided to the non-orbiting scroll (with respect to the main bearing housing).

Typically, a seal assembly S is provided as a floating seal in the annular recess 158 of the non-orbiting scroll 150. That is, the seal assembly S is disposed between the partition 116 and the non-orbiting scroll 150. The annular recess 158 is in fluid communication with one of a series of compression chambers C1, C2, C3 via a through bore 155 (also referred to as a medium pressure fluid passage) formed in the non-orbiting scroll end plate 154. Preferably, annular recess 158 is in fluid communication with intermediate compression chamber C2 via throughbore 155. So that the seal assembly S cooperates with the annular recess 158 to form a back pressure chamber BC that provides back pressure to the orbiting scroll 150. The axial displacement of the seal assembly S is limited by the spacer 116. When the pressure in each compression chamber exceeds a set value, the resultant force generated by the pressure in these compression chambers will exceed the down force provided in the back pressure chamber BC to move the non-orbiting scroll 150 upward. At this time, fluid in the compression chamber will leak to the low pressure side through the gap between the tips of the spiral blades 156 of the non-orbiting scroll 150 and the end plate 164 of the orbiting scroll 160 and the gap between the tips of the spiral blades 166 of the orbiting scroll 160 and the end plate 154 of the non-orbiting scroll 150 to achieve unloading, thereby providing axial flexibility to the scroll compressor. Thus, the seal assembly floats axially under the influence of the compression pocket fluid from the intermediate pressure passage to match the axial float of the non-orbiting scroll.

The construction and function of the seal assembly S will be described in more detail below. As shown in fig. 10, the sealing assembly S may include an upper plate S1, a lower plate S2, and first and third seals S3 and S5 disposed between the upper and lower plates S1 and S2. The shape of the seal assembly S substantially corresponds to the shape of the annular recess 158 (back pressure chamber BC) such that the first seal S3 may seal against the radially inner side wall of the annular recess 158 and the third seal S5 may seal against the radially outer side wall of the annular recess 158. Further, the upper end of the upper plate S1 may be sealed against the partition 116 or a collar 117 provided on the partition 116.

The seal assembly S achieves a seal in the compressor in the following manner: 1) The upper end of the upper plate S1 abuts against a collar 117 on the diaphragm 116 to achieve separation of the high and low pressure sides; 2) The first seal S3 abuts against the radially inner side wall of the annular recess 158 to achieve the separation of the high pressure side from the back pressure chamber BC; 3) The third seal S5 abuts against the radially outer side wall of the annular recess 158 to achieve separation of the back pressure chamber BC from the low pressure side.

However, for example, in the case of a rapid start of the compressor, the flow rate of fluid entering the back pressure chamber on the fixed scroll is too fast and instantaneously impacts on the lower surface of the floating seal/seal assembly to push the floating seal up, and the floating seal is inclined to be stuck on both sides of the back pressure chamber due to uneven stress on the lower surface thereof at various portions of the rising rate, thereby causing leakage of fluid between the high pressure side, the low pressure side and the back pressure chamber to fail the seal.

In view of this, the present application provides a compressor having an improved floating seal configuration, and the floating seal configuration is described with reference to fig. 1 to 10.

An embodiment of the present application will be described with reference to fig. 3 to 5, fig. 3 being a schematic perspective view of a non-orbiting scroll including a flow reversing structure in the form of a holder of a scroll compressor according to an embodiment of the present application. Fig. 4 is a schematic cross-sectional view of a non-orbiting scroll and a cage of the scroll compressor of fig. 3. Fig. 5 is a perspective view of a retainer of the scroll compressor of fig. 3.

The present application contemplates that a flow reversing structure is disposed between a fluid passage of the non-orbiting scroll (e.g., through-hole 155 provided in non-orbiting scroll end plate 154) in communication with the intermediate pressure compression chamber and the floating seal or seal assembly, the flow reversing structure being configured to regulate the direction of the compression chamber fluid discharged from the fluid passage, e.g., to regulate the compression chamber fluid in a direction different from the direction toward the floating seal. By means of the air flow reversing structure, even if the compressor is started quickly, the floating sealing piece stably axially floats under the action of the compression cavity fluid regulated by the air flow reversing structure, so that reliable sealing is achieved, specifically, the compression cavity fluid in the fluid channel in fluid communication with the medium-pressure compression cavity flows through the air flow reversing structure firstly, the flowing direction of the compression cavity fluid changes when the compression cavity fluid flows through the air flow reversing structure, for example, the flow of the compression cavity fluid can be changed from the approximately axial direction to the approximately radial direction or the direction of the air flow reversing structure to the direction of the air flow reversing structure at an angle to the axial direction, and then the whole medium-pressure cavity is filled, so that the floating sealing ring is pushed to lift evenly, and the functions of isolating each cavity and providing the downward pressure of the movable vortex fitting are achieved. Therefore, the fluid in the compression cavity after the direction change does not directly impact the floating sealing element, so that the phenomenon that the floating sealing element is inclined and blocked due to uneven stress to cause sealing failure is avoided.

Referring to fig. 5, the airflow reversing structure may be in the form of a cage 200 and includes an annular support body 220 and a central baffle 240 axially offset relative to the annular support body, the annular support body and the central baffle being connected by at least one connecting arm 230 to form a plurality of radial passages 250 therebetween.

By means of this cage structure, the substantially axially flowing compression chamber fluid from the fluid passage is blocked by the central baffle and thus flows out substantially radially (compression chamber fluid changes from the previous substantially axial direction to the substantially radial direction) via the plurality of radial passages, for example being directed to the side wall of the annular recess of the non-orbiting scroll. In the drawings, the center baffle 240 is perpendicular to the axial direction such that axially flowing compression chamber fluid flows generally radially from the radial channels 250, and in other aspects of the embodiments, the center baffle may be inclined at an angle relative to the axial direction so long as the inclined angle center baffle is such that compression chamber fluid flowing from the radial channels does not directly impinge on the floating seal.

The air flow reversing structure in the form of the retainer can be directly molded into an integral component by using a sheet metal process, so that the process is simple and the cost of accessories is reduced.

The cage 200 also includes a snap-fit portion extending from the annular support body that snaps into a corresponding portion of the non-orbiting scroll to secure the cage to the non-orbiting scroll. In an advantageous aspect according to the first embodiment, a counterbore 180 is provided around the drain port at the bottom of the annular recess 158 (see fig. 4), the counterbore being configured stepped so as to include a top inner wall surface 181, a top surface 182, a bottom surface 183 and a bottom inner wall surface 184 connecting the top surface to the bottom surface.

Referring again to fig. 5, the cage 200 may further include a first clamping portion 222 and a second clamping portion 221, the first clamping portion 222 radially extending from the annular support body 220 and clamping a radially outer end of the first clamping portion to the bottom inner wall surface 184, the second clamping portion 221 radially extending from the annular support body 220 and axially extending and radially extending again to include an inner radial section, an axial section, and an outer radial section, the axial section clamping to the bottom inner wall surface 184, the radially outer end of the outer radial section clamping to the top inner wall surface 181. In the drawings, 6 first catching portions 222 uniformly disposed along the circumferential direction of the ring-shaped supporting body 220 and two second catching portions 221 symmetrically disposed are shown, however, one skilled in the art may set the number of catching portions as required. Also, the cage 200 is constructed and arranged such that the central baffle 240 is below the outer radial section or below both the outer radial section and the top surface.

By means of the structure that the retainer is clamped in the counter bore, the integral structure of the airflow reversing structure is flush with or below the surface of the end plate, i.e. the airflow reversing structure is arranged in the counter bore so that the airflow reversing structure does not protrude from the counter bore, thereby avoiding interference with the floating seal. Meanwhile, the retainer is firmly connected to the fixed scroll through the matched connection of the clamping part and the counter bore, and the detachable connection and matching of the clamping part and the counter bore are also beneficial to assembly and maintenance.

Next, another embodiment of the present application will be described with reference to fig. 6 to 10, and fig. 6 is a schematic perspective view of a non-orbiting scroll including a flow reversing structure in the form of bolts of a scroll compressor according to another embodiment of the present application. Fig. 7 is a schematic cross-sectional view of a non-orbiting scroll and bolts of the scroll compressor of fig. 6. Fig. 8 is a perspective view of a bolt of the scroll compressor of fig. 6. Fig. 9 is a schematic cross-sectional view of the bolt of fig. 6 showing the reversing channel thereof. Fig. 10 is another schematic cross-sectional view of the bolt of fig. 6 including a reversing channel thereof.

In particular, referring to fig. 6-10, the airflow reversing structure may be in the form of a bolt 300 and include a bolt portion 320 provided with an axial passage 321 and a nut portion 340 provided with a radial passage 341 such that the compression chamber fluid discharged from the fluid passage 155 is reversed by first entering the axial passage 321 and then the radial passage 341. In the illustrated vent bolt structure, the axial channel is a vertical hole, and the radial channel is a transverse through hole, and the transverse through hole can be two transverse through holes which penetrate through the nut part and are communicated with each other in a crossing manner, so that the mounting mode of the bolt is simple, the assembly efficiency can be improved, and the cost can be reduced. In an advantageous aspect of the embodiment, the punch modification may be performed directly with existing hex head bolts, wherein the transverse through holes penetrate opposite surfaces of the nut portion of the bolt, which results in a high part machining efficiency and low cost.

In this embodiment, there is also a counterbore configuration similar to the above embodiment. Specifically, referring to fig. 7, a counterbore is provided around the discharge port at the bottom of the annular recess 158, the counterbore being configured in a stepped shape so as to include a top inner wall surface 181, a top surface 182, a bottom surface 183, and a bottom inner wall surface 184 connecting the top surface with the bottom surface, and a bolt portion 320 of a bolt 300 being threadedly connected with the bottom inner wall surface 184 so as to fix the bolt to the fixed scroll.

In embodiments of the application, the air flow reversing structure, for example in the form of a cage or a bolt, may be configured such that the fluid channel remains normally open. Wherein a central baffle of a retainer or a screw cap portion of a screw bolt as an air flow reversing structure may be provided to serve as a baffle spaced apart from the discharge port of the fluid passage.

Although preferred embodiments of the present application have been described in detail herein, it is to be understood that the application is not limited to the precise construction herein described and illustrated, and that other modifications and variations may be effected by one skilled in the art without departing from the spirit and scope of the application. All such modifications and variations are intended to be within the scope of the claims appended hereto.

Claims (12)

1. A scroll compressor comprising:

a Compression Mechanism (CM) comprising a non-orbiting scroll (150) and an orbiting scroll (160), the non-orbiting scroll cooperating with the orbiting scroll to form a series of compression chambers for compressing a working fluid, the non-orbiting scroll comprising a fluid passageway (155); and

a floating seal (S) provided on one side of the non-orbiting scroll to define a back pressure chamber (BC) between the floating seal and the non-orbiting scroll, the back pressure chamber being in communication with a middle pressure compression chamber of the compression chambers via the fluid passage so that the floating seal can axially float under the action of compression chamber fluid from the middle compression chamber,

characterized in that a flow reversing structure (200; 300) is arranged between the fluid channel (155) and the floating seal (S), said flow reversing structure being configured to regulate the direction of the compression chamber fluid discharged from the fluid channel.

2. The scroll compressor of claim 1, wherein the airflow reversing structure is configured such that the fluid passage remains normally open.

3. The scroll compressor according to claim 1, wherein said fluid passageway includes a discharge port in fluid communication with said back pressure chamber (BC), said flow reversing structure including a baffle disposed in spaced relation to said discharge port.

4. A scroll compressor according to any one of claims 1 to 3, wherein the airflow reversing structure is in the form of a cage (200) and comprises an annular support body (220) and a central baffle (240) axially offset relative to the annular support body, the annular support body and the central baffle being connected by at least one connecting arm (230) to form a plurality of radial channels (250) between the annular support body and the central baffle.

5. The scroll compressor of claim 4, wherein the cage is a unitary member directly formed from a sheet metal process.

6. The scroll compressor of claim 4, wherein the cage further comprises a snap-fit portion (221, 222) extending from the annular support body that snaps with a corresponding portion of the non-orbiting scroll to secure the cage to the non-orbiting scroll.

7. The scroll compressor of claim 6, wherein:

the non-orbiting scroll further includes an annular recess (158) receiving the floating seal and defining the back pressure chamber, a discharge port of the fluid passage being disposed at a bottom of the annular recess,

a counterbore (180) is provided around the discharge port at the bottom of the annular recess, the counterbore being stepped so as to include a top inner wall surface (181), a top surface (182), a bottom surface (183) and a bottom inner wall surface (184) connecting the top surface with the bottom surface,

the retainer further comprises a first clamping portion (222) and/or a second clamping portion (221), the first clamping portion (222) extends radially from the annular supporting body (220) and the radially outer end of the first clamping portion is clamped to the bottom inner wall surface (184), the second clamping portion (221) extends radially from the annular supporting body (220) and then extends axially and then extends radially to comprise an inner radial section, an axial section and an outer radial section, the axial section is clamped to the bottom inner wall surface (184), and the radially outer end of the outer radial section is clamped to the top inner wall surface (181).

8. The scroll compressor of claim 7, wherein said cage is constructed and arranged such that said center baffle (240) is lower than said outer radial section or lower than both said outer radial section and said top surface.

9. A scroll compressor according to any one of claims 1 to 3, wherein the gas flow reversing arrangement is in the form of a bolt (300) and comprises a bolt portion (320) provided with an axial passage (321) and a nut portion (340) provided with a radial passage (341) such that the compression chamber fluid discharged from the fluid passage (155) is reversed by first entering the axial passage (321) and then entering the radial passage (341).

10. The scroll compressor of claim 9, wherein the radial passage includes two intersecting through holes extending through the nut portion.

11. The scroll compressor of claim 9, wherein:

the non-orbiting scroll further includes an annular recess (158) receiving the floating seal and defining the back pressure chamber, a discharge port of the fluid passage being disposed at a bottom of the annular recess,

a counterbore is provided around the discharge port at the bottom of the annular recess, the counterbore being stepped so as to include a top inner wall surface (181), a top surface (182), a bottom surface (183) and a bottom inner wall surface (184) connecting the top surface with the bottom surface,

the bolt portion (320) is screwed with the bottom inner wall surface (184) to fix the bolt to the fixed scroll.

12. A scroll compressor as claimed in any one of claims 1 to 3, wherein:

the non-orbiting scroll further includes an annular recess (158) receiving the floating seal and defining the back pressure chamber, a discharge port of the fluid passage being disposed at a bottom of the annular recess,

a counterbore is provided around the exhaust port at the bottom of the annular recess, the air flow reversing structure being arranged in the counterbore such that the air flow reversing structure does not protrude from the counterbore.