CN113931842A

CN113931842A - Scroll compression mechanism and scroll compressor

Info

Publication number: CN113931842A
Application number: CN202010603159.8A
Authority: CN
Inventors: 张琼宇; 刘轩; 吴严欢; 刘畅
Original assignee: Emerson Climate Technologies Suzhou Co Ltd
Current assignee: Copeland Suzhou Co Ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2022-01-14

Abstract

The utility model provides a scroll compression mechanism and scroll compressor, this scroll compression mechanism includes: carrying out movable vortex; and including the fixed vortex subassembly of deciding vortex and apron, the fixed vortex includes the fixed vortex end plate, the apron is fixed in one side of deciding the vortex end plate, make and prescribe a limit to the central high-pressure concave part that can communicate with central compression chamber fluid between apron and the fixed vortex end plate, one side that deviates from the fixed vortex at the apron is provided with the back pressure chamber, decide the vortex subassembly still is provided with the middling pressure passageway, the middling pressure passageway is with middle compression chamber and back pressure chamber fluid intercommunication, be provided with between apron and the fixed vortex end plate and prescribe a limit to the sealed additional strengthening who strengthens the region, the middling pressure passageway passes sealed additional strengthening region, thereby prevent that working fluid from leaking to the middling pressure passageway from central high-pressure concave part. According to the scroll compression mechanism disclosed by the invention, the abrasion failure of the scroll compression mechanism can be prevented, the service life of the scroll compression mechanism is prolonged, and the service performance of the scroll compression mechanism is improved.

Description

Scroll compression mechanism and scroll compressor

Technical Field

The present disclosure relates to the field of scroll compressor technology, and more particularly, to a scroll compression mechanism and a scroll compressor.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

The compressor may be applied to application systems requiring different pressures, such as an air conditioning system, a refrigerator system, etc., and thus, a case where a discharge pressure of a compression chamber (a maximum pressure in the compression chamber) is greater than a pressure required for a specific application system, that is, an over-compression case may occur. In order to reduce or prevent over-compression of the working fluid, compressors having a variable volume ratio function have been developed.

In a variable volume ratio function compressor, generally, the fixed scroll adopts a split design including a cover plate. In such a split type fixed scroll, there is a problem that the scroll compression mechanism is liable to wear failure, and therefore there is a need to provide an improved scroll compression mechanism.

Disclosure of Invention

It is an object of one or more embodiments of the present disclosure to provide a scroll compression mechanism in which wear failure of the scroll compression mechanism can be prevented, the service life of the scroll compression mechanism can be extended, and the use performance thereof can be improved.

Another object of one or more embodiments of the present disclosure is to provide a scroll compression mechanism in which an assembling process of a compressor can be simplified and compatibility of a cover plate and a seal can be improved.

According to an aspect of the present disclosure, there is provided a scroll compression mechanism including: carrying out movable vortex; and a non-orbiting scroll assembly including a non-orbiting scroll and a cover plate, the non-orbiting scroll engaged with the orbiting scroll to define a series of compression chambers including a central compression chamber and an intermediate compression chamber, the non-orbiting scroll including a non-orbiting scroll end plate, the cover plate being fixed to one side of the non-orbiting scroll end plate such that a central high pressure recess capable of being in fluid communication with the central compression chamber is defined between the cover plate and the non-orbiting scroll end plate, a back pressure chamber is provided to one side of the cover plate facing away from the non-orbiting scroll, the non-orbiting scroll assembly further being provided with a medium pressure passage fluidly communicating the intermediate compression chamber with the back pressure chamber, characterized in that a seal reinforcing structure is provided between the cover plate and the non-orbiting scroll end plate, the seal reinforcing structure defining a seal reinforcing region, the medium pressure passage passing through the seal reinforcing region, thereby preventing working fluid from leaking from the central high pressure recess to the medium pressure channel.

According to an aspect of the disclosure, the intermediate pressure passage includes an intermediate pressure discharge hole provided in the non-orbiting scroll end plate and a cover plate discharge hole provided in the cover plate, and the seal reinforcement structure includes a perforated fastener provided with a longitudinal through hole, the perforated fastener passing through the cover plate discharge hole and being fastened in the intermediate pressure discharge hole such that the seal reinforcement area is defined at and around the perforated fastener, and such that the perforated fastener allows the intermediate compression chamber to be in fluid communication with the back pressure chamber via the longitudinal through hole while fastening the cover plate to the non-orbiting scroll end plate.

According to an aspect of the disclosure, the seal enhancing structure further comprises a sealing gasket or ring disposed at least about the apertured fastener.

According to an aspect of the present disclosure, the non-orbiting scroll assembly is further provided with a primary fastener disposed radially outward of the intermediate pressure passage and fixing the cover plate to the non-orbiting scroll end plate.

According to an aspect of the present disclosure, the seal reinforcement structure includes a first seal ring disposed radially inward of the medium pressure channel and a second seal ring disposed radially outward of the medium pressure channel such that the seal reinforcement region is defined between the first seal ring and the second seal ring.

According to an aspect of the present disclosure, the non-orbiting scroll assembly is further provided with a primary fastener, the primary fastener and the intermediate pressure passage are both located in the seal reinforcement area and the primary fastener fixes the cover plate to the non-orbiting scroll end plate.

According to an aspect of the present disclosure, in the seal reinforcement area, one or both of a surface of the cover plate facing the non-orbiting scroll end plate and a surface of the non-orbiting scroll end plate facing the cover plate is provided with an annular air guide groove, the medium pressure passage includes a medium pressure discharge hole provided in the non-orbiting scroll end plate and a cover plate discharge hole provided in the cover plate, and the medium pressure discharge hole and the cover plate discharge hole are both opened to the air guide groove.

According to an aspect of the present disclosure, the primary fastening members are plural and arranged uniformly in a circumferential direction.

According to an aspect of the present disclosure, the portion of the intermediate pressure passage disposed in the non-orbiting scroll end plate includes a first axial section connected with the intermediate compression chamber, a second axial section opened to a surface of the non-orbiting scroll end plate facing the cover plate, and a lateral connection section connecting the first axial section and the second axial section.

According to an aspect of the present disclosure, a variable volume ratio orifice is provided in the non-orbiting scroll end plate, and a check valve for selectively opening and closing the variable volume ratio orifice is provided in the central high pressure recess.

According to another aspect of the present disclosure, a scroll compressor including a scroll compression mechanism is provided.

According to the compressor structure disclosed by the invention, the abrasion failure of the vortex compression mechanism can be prevented, the service life of the vortex compression mechanism is prolonged, and the service performance of the vortex compression mechanism is improved.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.

Fig. 1 is a sectional view schematically showing a compressor according to a comparative example;

fig. 2 is a sectional view schematically showing a non-orbiting scroll assembly of a compressor according to a comparative example;

fig. 3 is an exploded perspective view schematically illustrating a non-orbiting scroll assembly of a compressor according to a comparative example;

fig. 4a and 4b are a sectional view and an exploded perspective view, respectively, schematically illustrating a non-orbiting scroll assembly of a compressor according to a first embodiment of the present disclosure;

FIG. 5 is a top view schematically illustrating an alternative arrangement of seals of the non-orbiting scroll assembly of the compressor in accordance with the first embodiment of the present disclosure;

fig. 6 is a sectional view schematically illustrating a non-orbiting scroll assembly of a compressor according to a second embodiment of the present disclosure;

fig. 7 is an exploded perspective view schematically illustrating a non-orbiting scroll assembly of a compressor according to a second embodiment of the present disclosure;

FIG. 8 schematically illustrates a foolproof design of a non-orbiting scroll assembly of a compressor according to a comparative example; and

fig. 9 is a sectional view schematically illustrating a non-orbiting scroll assembly of a compressor according to a third embodiment of the present disclosure.

Detailed Description

The following description of the various embodiments of the disclosure is merely exemplary in nature and is in no way intended to limit the disclosure, its application, or uses. The same reference numerals are used to designate the same components in the respective drawings, and thus the configurations of the same components will not be described repeatedly.

A compressor having a variable volume ratio function according to a comparative example will be described with reference to fig. 1 to 3, in which fig. 1 is a sectional view schematically showing the compressor according to the comparative example; fig. 2 is a sectional view schematically showing a non-orbiting scroll assembly of a compressor according to a comparative example; and fig. 3 is an exploded perspective view schematically illustrating a non-orbiting scroll assembly of a compressor according to a comparative example.

As shown in FIG. 1, a scroll compressor 1 includes a generally closed housing 10. The housing 10 may be composed of a substantially cylindrical body portion, a top cover 12 provided at one end of the body portion, and a bottom cover 16 provided at the other end of the body portion. A partition 14 is provided between the top cover 12 and the body part to partition the inner space of the housing 10 into a fluid suction chamber 11 and a fluid discharge chamber 13. The space between the partition 14 and the top cover 12 constitutes a fluid discharge chamber 13, and the space between the partition 14, the body portion, and the bottom cover constitutes a fluid suction chamber 11.

A scroll compression mechanism and a drive mechanism for driving the scroll compression mechanism are provided in the housing 10. The compression mechanism sucks fluid from the fluid suction chamber 11 of the housing 10 and discharges the fluid after compression into the fluid discharge chamber 13 of the housing 10. Referring to fig. 1, a compression mechanism may include, for example, a non-orbiting scroll assembly 30 and an orbiting scroll 20. The orbiting scroll 20 includes an orbiting scroll end plate and a spiral orbiting wrap formed on one side of the orbiting scroll end plate. As more clearly shown in fig. 2, non-orbiting scroll assembly 30 includes a non-orbiting scroll end plate 32 and a spiral-shaped non-orbiting scroll wrap 34 formed on one side of the non-orbiting scroll end plate, non-orbiting scroll end plate 32 including a main discharge port 50 formed at a substantially central position of the non-orbiting scroll end plate, a variable volume ratio orifice 52 located radially outward of main discharge port 50, and a medium pressure discharge orifice 54 located radially outward of variable volume ratio orifice 52.

As shown in FIG. 2, non-orbiting scroll assembly 30 further includes a cover plate 100, cover plate 100 being disposed on a side of non-orbiting scroll end plate 32 opposite wrap 34 and secured to non-orbiting scroll end plate 32. Specifically, as shown in fig. 3, a plurality of fixing holes 128 are formed in the cover plate 100, a plurality of fixing holes 114 corresponding to the fixing holes 128 are formed in the non-orbiting scroll end plate 32, a primary fastening member 124 such as a screw may be extended through the

fixing holes

128 and 114 to fix the cover plate 100 to the non-orbiting scroll assembly 30, and the fastening member 124 may be provided in plurality and uniformly distributed on the cover plate to apply a uniform fastening force. As shown in fig. 2, the cover plate 100 is further formed with a cover plate discharge hole 140 corresponding to the middle pressure discharge hole 54, and the working fluid in the intermediate compression chamber C3 may flow to the back pressure chamber 70 through a middle pressure passage including the middle pressure discharge hole 54 and the cover plate discharge hole 140. A fixed bore 114 is provided at the outer periphery of the non-orbiting scroll end plate 32, and a central high pressure recess 36 is provided radially inward of the fixed bore 114, and further, as shown in fig. 2, the central high pressure recess 36 is in fluid communication with the main exhaust port 50 and is in selective fluid communication with the variable volume ratio orifice 52, i.e., the working fluid within the central high pressure recess 36 is at a high pressure exhaust pressure. The variable volume ratio orifice 52 is provided with a one-way valve (only a single variable volume ratio orifice is shown in fig. 2, but it will be appreciated that a plurality of variable volume ratio orifices may be formed as desired). The check valve allows fluid flow from the compression chambers to the central high pressure recess 36 and prevents fluid flow from the central high pressure recess 36 to the compression chambers. The check valve may include a valve sheet covering the variable volume ratio orifice and a valve stop preventing the valve sheet from being excessively deformed. The check valve may be secured in the non-orbiting scroll end plate 32 by fasteners such as screws.

As shown in fig. 2, the cover plate 100 includes an inner annular wall 110 (also referred to as a first annular wall) and an outer annular wall 130 (also referred to as a second annular wall) and a connecting portion 150 connecting the inner and outer annular walls. The inner annular wall 110 surrounds a central cavity 120, the central cavity 120 being in fluid communication with the central high pressure recess 36. The back pressure chamber 70 is constituted by the space surrounded by the inner annular wall 110, the outer annular wall 130, and the connecting portion 150 and is closed by a seal assembly provided therein. As shown in fig. 2, the back pressure chamber 70 is in fluid communication with the intermediate compression chamber C3 through the intermediate pressure discharge hole 54, thereby creating a force that compresses the non-orbiting scroll assembly 30 toward the orbiting scroll 20, and the non-orbiting scroll assembly 30 and the orbiting scroll 20 can be effectively compressed together using the pressure in the back pressure chamber 70.

During operation of the compressor 1, working fluid is drawn into the compression mechanism and compressed as it flows from the radially outermost position to the radially innermost position, that is, the pressure of working fluid in the radially outermost one of the compression chambers is smallest, the pressure of working fluid in the radially innermost compression chamber, i.e., the central compression chamber C1 at the center position of the scroll is largest, and the working fluid in the intermediate compression chamber C3 between the radially outermost position and the innermost position has an intermediate pressure between the maximum pressure and the minimum pressure. The compressed fluid is discharged to the central high-pressure recess 36 of the non-orbiting scroll end plate 32 through the main discharge port 50. However, in the over-compressed state, the compression mechanism compresses the working fluid to be at a pressure higher than that required by an application system (e.g., an air conditioning system, a refrigerator system, a low temperature freezing system, etc.), and thus, the compressor performs an unnecessary work in the over-compressed state. To prevent over-compression, fluid may be expelled through the variable volume ratio orifice 52 into the central high pressure recess 36 in advance before reaching the radially innermost position. Specifically, when the pressure in a particular compression chamber is greater than or equal to the pressure required by the application, the one-way valve can open the variable volume ratio orifice 52 so that the fluid in that compression chamber is discharged directly without over-compression.

As shown in fig. 2, the central high pressure recess 36 is in fluid communication with the central cavity 120 and has a higher pressure equal to the compressor discharge pressure, the space radially outward of the non-orbiting scroll end plate 32 is located within the fluid suction cavity and has a lower pressure equal to the compressor suction pressure, and the back pressure cavity 70 is in fluid communication with the intermediate pressure discharge hole 54 and has an intermediate pressure between the discharge pressure and the suction pressure. In order to prevent the high-pressure fluid in the central high-pressure recess 36 from leaking to the low-pressure space through the interface between the cover plate 100 and the non-orbiting scroll end plate 32, a seal gasket 60 is provided between the cover plate 100 and the non-orbiting scroll end plate 32. The sealing gasket 60 is formed with an exhaust port 64 and a fixed bore 66, the exhaust port 64 and the fixed bore 66 being aligned with the intermediate pressure exhaust port 54 and the fixed bore 114, respectively, of the non-orbiting scroll end plate 32.

As shown particularly in fig. 3, a plurality of fasteners 124 secure the cover plate 100 and the sealing gasket 60 to the non-orbiting scroll assembly 30. The fastening force applied by the fasteners 124 sandwiches the sealing gasket 60 between the non-orbiting scroll end plate 32 of the non-orbiting scroll assembly 30 to seal the interface therebetween. However, in the actual use of the compressor, there is a problem in that the scroll fails due to the fixed scroll and the movable scroll wearing against each other, which adversely affects the service life and compression performance of the compressor.

The inventors of the present application have repeatedly studied and found that such a problem is caused by the relative position of the fastener and the medium pressure vent hole. Specifically, on the one hand, fasteners, such as screws, are typically disposed on the outer periphery of the non-orbiting scroll end plate 32 to provide sufficient space for mounting the check valve to selectively open the variable volume ratio orifice and so that the fasteners do not interfere with the proper operation of the check valve. On the other hand, to provide sufficient back pressure to the back pressure chamber 70, the medium pressure vent holes 54 are typically located at a radially inward position relative to the fasteners (or the fastening holes for the fasteners). This causes a relative offset in the radial direction between the fastening member and the intermediate pressure discharge hole, and it has been found by the inventors of the present application through simulation experiments that such a radial offset between the fastening member and the intermediate pressure discharge hole results in a portion of the sealing gasket being subjected to insufficient fastening force to effectively seal the interface between the orbiting scroll end plate and the cover plate, thereby causing fluid leakage. Specifically, a portion of the seal gasket located in the vicinity of the intermediate pressure discharge hole is subjected to insufficient fastening force, which causes high-pressure working fluid located in the recess to leak into the intermediate pressure discharge hole 54 and further to the back pressure chamber 70, and the leaked high-pressure fluid causes a pressure rise in the back pressure chamber 70, which further causes a large increase in axial pressure with which the non-orbiting scroll assembly 30 is pressed toward the orbiting scroll 20, thereby causing wear between the scrolls.

In order to solve the above problems, the present inventors have devised an improved compressor structure capable of increasing the sealing of a strong cover plate with a non-orbiting scroll end plate, thereby preventing the abrasion of a scroll due to the leakage of a high-pressure working fluid. Specifically, a seal reinforcement structure is provided in a contact region between the cover plate and the non-orbiting scroll end plate, the seal reinforcement structure defining a seal reinforcement region through which a medium pressure passage including a medium pressure discharge hole passes, thereby preventing a working fluid from leaking from the central high pressure recess to the back pressure chamber via the contact region by reinforcing sealing of the medium pressure discharge hole.

Fig. 4a and 4b illustrate a sectional view and an exploded perspective view, respectively, of a non-orbiting scroll assembly of a compressor according to a first embodiment of the present disclosure. The compressor according to the first embodiment of the present disclosure is constructed substantially the same as the compressor according to the comparative example, and will not be described herein again, except that the compressor according to the first embodiment of the present disclosure further includes a perforated fastener 80 fixed in the medium pressure discharge hole 54. The perforated fastener 80 may be secured in the medium pressure vent 54 in any suitable manner, such as a threaded connection, an interference fit, and the like. The apertured fastener 80 is formed with a longitudinal through-hole in fluid communication with the medium pressure vent 54 and the back pressure chamber 70. The sealing gasket around the perforated fastener 80 is tightly clamped between the cover plate and the end plate of the fixed scroll by the fastening force exerted by the perforated fastener 80, and the perforated fastener 80 and the sealing gasket form a sealing reinforcing structure, in this way, the perforated fastener 80 can define a sealing reinforcing area at the position and the surrounding area thereof, and in the sealing reinforcing area, the perforated fastener 80 directly acts on the medium-pressure exhaust hole 54, so that the fastening force applied to the sealing gasket in the area near the medium-pressure exhaust hole 54 can be obviously improved, the high-pressure working fluid can be prevented from leaking to the medium-pressure exhaust hole 54 and further leaking to the back pressure cavity 70, and the abrasion failure of the fixed scroll and the movable scroll can be avoided. Therefore, the improved scheme which is simple in structure, strong in operability and low in cost is provided. In addition, the fastening force exerted by the fastener may be further increased by increasing the size of the fastener (e.g., increasing the size of the fastening head).

In the compressor of the first embodiment of the present disclosure, the seal is not limited to the integral sealing gasket 60 shown in fig. 3, but may take any other suitable form. Figure 5 shows a top view of the non-orbiting scroll assembly provided with an alternative sealing gasket, with some parts of the non-orbiting scroll removed for clarity. Referring to fig. 5, instead of the sealing gasket, a sealing gasket may be used which includes a first O-ring 62b surrounding the medium pressure discharge hole 54 and a second O-ring 64b disposed between the medium pressure discharge hole 54 and the fixing hole 114. In this case, the seal reinforcing structure includes a first O-ring 62b provided in a contact area of the cover plate with the non-orbiting scroll end around the middle pressure passage, thereby defining a seal reinforcing area at the first O-ring 62b and an area inside thereof. Although embodiments are shown in which a sealing gasket or seal is provided between the cover plate and the non-orbiting scroll end plate, it will be appreciated that in the event that the gap between the cover plate and the non-orbiting scroll end plate is very small, the sealing gasket or seal may be omitted and the seal between the cover plate and the non-orbiting scroll end may be maintained directly by including the apertured fastener 80 and the primary fastener 124. Further, it should also be noted that although it is schematically described in the present application that the central high pressure recess 36 is formed in the top surface of the non-orbiting scroll end plate 32, it will be understood by those skilled in the art that the present disclosure is not limited thereto, and for example, a recess may be alternatively formed in the lower side of the cover plate 100, while the top surface of the non-orbiting scroll end plate 32 is formed to be planar. Alternatively, a recess may be formed in both the top surface of the non-orbiting scroll end plate 32 and the underside of the cover plate 100. So long as it is possible to provide a high pressure discharge area between the cover plate and the non-orbiting scroll end plate at a pressure equal to the discharge pressure of the scroll compressor, in fluid communication with the main discharge port 50 and selectively in fluid communication with the variable volume ratio orifice 52.

Hereinafter, the non-orbiting scroll assembly 30a of the compressor according to the second embodiment of the present disclosure will be described in detail with reference to fig. 6 to 7.

The non-orbiting scroll assembly 30a has substantially the same structure as the non-orbiting scroll assembly 30 according to the first embodiment and the comparative example, and only the difference thereof will be described below. As shown in fig. 6, the portion of the intermediate pressure passage disposed in non-orbiting scroll end plate 32a includes a first axial section 542a, a second axial section 544a, and a transverse connecting section 546 a. The first axial section 542a extends in the axial direction of the compressor and connects the intermediate compression pockets C3. The second axial section 544a extends in an axial direction to a surface of the non-orbiting scroll end plate 32a facing the cover plate 100 and forms a medium pressure discharge hole 54a, the medium pressure discharge hole 54a being substantially the same radial distance from the fixed bore 114 (shown in fig. 7) to the axis of the non-orbiting scroll, so that the medium pressure discharge hole 54a is located in the same annular region as the fixed bore 114. The transverse connecting section 546a may extend in a transverse direction perpendicular to the axial direction of the compressor and connect the first axial section 542a and the second axial section 544 a. The first axial section 542a extends through the non-orbiting scroll end plate 32a and is provided with a plug 210 at its end adjacent the central high pressure recess 36 to prevent leakage of working fluid from the intermediate pressure discharge passage to the central high pressure recess 36. The transverse connecting section 546a has an outer end portion penetrating the non-orbiting scroll end plate 32a, an intersection point P of the transverse connecting section 546a and the second axial section 544a, and the transverse connecting section 546a is provided with a plug 220 radially outward of the intersection point P to prevent leakage of the working fluid from the medium-pressure discharge passage to the fluid suction chamber. Since the portion of the transverse connecting section 546 radially inward of the intersection point P is necessary to form the intermediate pressure exhaust passage, while the portion radially outward of the intersection point P is an ineffective portion due to the machining process, preferably, the plug 320 may be disposed in the ineffective portion near the intersection point P to reduce the clearance volume of the compressor.

Referring to fig. 7, the orbiting scroll end plate is formed with an annular air guide groove 310, and the fixing hole 114 and the middle pressure discharge hole 54a are located in the air guide groove 310. Radially outside and inside the air guide groove 310 are provided a first seal groove 320 and a second seal groove 330, respectively, which accommodate a first seal ring 410 and a second seal ring 420. The first and

second seal grooves

320 and 330 may be disposed adjacent to the air guide groove 310. The sealing ring may illustratively comprise an O-ring seal, as well as any other suitable sealing gasket.

The cover plate 100a has substantially the same structure as the cover plate 100 except that the cover plate discharge hole 140a of the cover plate has the same radial distance from the fixed hole 128 to the axis of the non-orbiting scroll.

Referring to fig. 6 and 7, in non-orbiting scroll assembly 30a according to the second embodiment of the present disclosure, working fluid of intermediate compression chamber C3 flows from first axial section 542a to transverse connecting section 546a, thereafter flows through second axial section 544a into scoop channel 310, and finally flows from scoop channel 310 through cover plate vent hole 140a (not shown in fig. 6) into back pressure chamber 70. While the first seal ring 410 on the radially inner side prevents the high-pressure working fluid of the central high-pressure recess 36 from flowing to the air-guide groove 310, and the second seal ring 420 on the radially outer side prevents the medium-pressure working fluid in the air-guide groove 310 from flowing to the suction pressure chamber.

In the non-orbiting scroll according to the second embodiment of the present disclosure, the first and second seal rings 410 and 420 are disposed at an area around the primary fastener 124, and the primary fastener 124 may apply a sufficient fastening force to the first and second seal rings and the area therebetween, so that the seal reinforcing structure including the first and second seal rings defines a seal reinforcing area between the first and second seal rings. A medium pressure channel including medium pressure vent hole 54a is located within the seal reinforcement area. Specifically, as shown in fig. 7, since the medium pressure discharge hole 54a is the same as the radial distance of the fixed hole 114 to the axis of the non-orbiting scroll without radial offset, the medium pressure discharge hole 54a may be located in the seal reinforcing region between the first seal ring and the second seal ring. In this way, the middle pressure passage including the middle pressure discharge hole 54a is made to pass through the seal reinforcing region, so that the working fluid is prevented from leaking from the central high pressure recess to the back pressure chamber via the contact region by reinforcing the seal of the middle pressure discharge hole, thereby preventing the abrasion failure of the fixed scroll and the orbiting scroll.

Further, in the non-orbiting scroll according to the second embodiment of the present disclosure, since the working fluid in the intermediate compression chamber is introduced into the back pressure chamber 70 using the annular air guide groove 310, the middle pressure discharge hole 54a of the non-orbiting scroll end plate 32a and the cover plate discharge hole 140a of the cover plate can be aligned at any position in the arrangement circumferential direction without using a fool-proof design, the assembly process is simplified, and the versatility of the cover plate and the seal gasket can also be improved. Specifically, in the non-orbiting scroll according to the comparative example and the first embodiment, in order to introduce the working fluid in the intermediate compression chamber into the back pressure chamber 70, it is necessary to align the middle pressure discharge hole 54 of the non-orbiting scroll end plate 32, the discharge port 64 of the sealing gasket 60, and the cover plate discharge hole of the cover plate 100, thereby forming the middle pressure passage. To this end, it is necessary to provide corresponding fool-proof designs on the sealing gasket 60 and the non-orbiting scroll end plate 32, fig. 8 shows an example of a fool-proof design for a sealing gasket and a non-orbiting scroll end plate in a compressor according to a comparative example, with a fool-proof feature 68 on the sealing gasket 60 and a corresponding fool-proof feature 38 on the non-orbiting scroll end plate 32 to align the medium pressure discharge hole 54 of the non-orbiting scroll end plate 32 with the discharge hole in the sealing gasket 60, as shown in fig. 8. Because the position of the medium pressure exhaust hole of the different fixed vortexes is different, the cover plate and the sealing gasket are designed separately aiming at the specific fixed vortexes to match with the different medium pressure exhaust hole designs, so that the cover plate and the sealing gasket cannot be used universally. In the stage of designing the vortex concept, in order to improve the performance of the compressor and reduce the axial force of the vortex, the position of the medium-pressure exhaust hole can be continuously adjusted and changed, and a new sealing gasket and a new cover plate are required to be customized when the position of the exhaust hole is adjusted and changed every time, so that the design cost is remarkably increased, and the development speed of new products is reduced. Meanwhile, with the development of new products, the number of the cover plates and the sealing gaskets is continuously increased, the difference between the appearance characteristics of the cover plates and the sealing gaskets is very small, the material mixing is easily caused, and the normal production is influenced. In the fixed scroll according to the second embodiment of the present disclosure, however, since the middle pressure discharge holes of the fixed scroll and the cover plate may be arranged at arbitrary positions in the circumferential direction without being aligned with each other, the same set of cover plate and sealing gasket may be applied to the fixed scroll having different middle pressure discharge holes, whereby the position of the middle pressure discharge hole of the fixed scroll may be very conveniently adjusted without replacing the sealing gasket and the cover plate with new ones.

FIG. 9 illustrates a cross-sectional view of a non-orbiting scroll assembly 30b according to a third embodiment of the present disclosure. The non-orbiting scroll assembly 30b has substantially the same structure as the non-orbiting scroll assembly 30a according to the second embodiment of the present disclosure, except that the air guide groove 310b is formed at the lower side of the cover plate 100b, and the top surface of the non-orbiting scroll end plate 32 is formed in a planar shape, thereby facilitating the spatial layout of the upper plane of the non-orbiting scroll and reducing the difficulty in manufacturing the non-orbiting scroll. It will be understood by those skilled in the art that the present disclosure is not limited thereto and that the air guide groove may be formed at both the top surface of the non-orbiting scroll end plate 32 and the underside of the cover plate 100.

Although various embodiments and modifications of the present disclosure have been specifically described above, it will be understood by those skilled in the art that the present disclosure is not limited to the specific embodiments and modifications described above but may include other various possible combinations and combinations. Other modifications and variations may be effected by one skilled in the art without departing from the spirit and scope of the disclosure. All such variations and modifications are intended to fall within the scope of the present disclosure. Moreover, all the components described herein may be replaced by other technically equivalent components.

Claims

1. A scroll compression mechanism comprising:

an orbiting scroll (20); and

a non-orbiting scroll assembly comprising a non-orbiting scroll (30,30a,30b) engaged with the orbiting scroll to define a series of compression chambers including a central compression chamber (C1) and an intermediate compression chamber (C3), the non-orbiting scroll comprising a non-orbiting scroll end plate (32,32a), and a cover plate (100,100a,100b) fixed to one side of the non-orbiting scroll end plate (32,32a) such that a central high pressure recess (36) is defined between the cover plate and the non-orbiting scroll end plate which can be in fluid communication with the central compression chamber, a back pressure chamber (70) being provided on the side of the cover plate facing away from the non-orbiting scroll, the non-orbiting scroll assembly further being provided with an intermediate pressure passage which fluidly communicates the intermediate compression chamber with the back pressure chamber,

wherein a seal reinforcement structure is provided between the cover plate and the non-orbiting scroll end plate, the seal reinforcement structure defining a seal reinforcement region through which the intermediate pressure passage passes, thereby preventing leakage of working fluid from the central high pressure recess to the intermediate pressure passage.

2. The scroll compression mechanism of claim 1,

the intermediate pressure passage includes an intermediate pressure discharge hole (54) provided in the non-orbiting scroll end plate and a cover plate discharge hole (140) provided in the cover plate, and the seal reinforcement structure includes a perforated fastener (80) provided with a longitudinal through hole, the perforated fastener passing through the cover plate discharge hole (140) and being fastened in the intermediate pressure discharge hole such that a seal reinforcement area is defined at and around the perforated fastener, and such that the perforated fastener allows the intermediate compression chamber and the back pressure chamber to be in fluid communication via the longitudinal through hole while fastening the cover plate to the non-orbiting scroll end plate.

3. The scroll compression mechanism of claim 2,

the seal reinforcing structure further comprises a sealing gasket or a sealing ring at least arranged around the fastener with the hole.

4. The scroll compression mechanism of claim 2,

the non-orbiting scroll assembly is further provided with a primary fastener (124) disposed radially outward of the intermediate pressure passage and securing the cover plate to the non-orbiting scroll end plate.

5. The scroll compression mechanism of claim 1,

the seal reinforcement structure includes a first seal ring (410) disposed radially inward of the intermediate pressure passage and a second seal ring (420) disposed radially outward of the intermediate pressure passage such that the seal reinforcement area is defined between the first seal ring (410) and the second seal ring (420).

6. The scroll compression mechanism of claim 5,

the non-orbiting scroll assembly is further provided with a primary fastener (124), both the primary fastener and the intermediate pressure passage being located in the seal reinforcement area and the primary fastener securing the cover plate to the non-orbiting scroll end plate.

7. The scroll compression mechanism of claim 5,

in the seal reinforcing region, one or both of a surface of the cover plate facing the non-orbiting scroll end plate and a surface of the non-orbiting scroll end plate facing the cover plate is provided with an annular air guide groove (310), the intermediate pressure passage includes an intermediate pressure exhaust hole (54) provided in the non-orbiting scroll end plate and a cover plate exhaust hole provided in the cover plate, and the intermediate pressure exhaust hole and the cover plate exhaust hole are both opened to the air guide groove.

8. The scroll compression mechanism of claim 5,

the primary fastening members are plural and arranged uniformly in the circumferential direction.

9. The scroll compression mechanism of any one of claims 1 to 8,

the portion of the intermediate pressure passage disposed in the non-orbiting scroll end plate includes a first axial section (542a) connected with the intermediate compression cavity, a second axial section (544a) opening to a surface of the non-orbiting scroll end plate facing the cover plate, and a transverse connecting section (546a) connecting the first axial section (542a) and the second axial section (544 a).

10. The scroll compression mechanism of any one of claims 1 to 8,

a variable volume ratio orifice (52) is provided in the non-orbiting scroll end plate, and a check valve for selectively opening and closing the variable volume ratio orifice is provided in the central high pressure recess.

11. A scroll compressor, characterized in that it comprises a scroll compression mechanism according to any one of claims 1 to 10.