WO2022000872A1

WO2022000872A1 - Scroll compression mechanism and scroll compressor

Info

Publication number: WO2022000872A1
Application number: PCT/CN2020/122652
Authority: WO
Inventors: 张琼宇; 刘轩; 吴严欢; 刘畅
Original assignee: 艾默生环境优化技术(苏州)有限公司
Priority date: 2020-06-29
Filing date: 2020-10-22
Publication date: 2022-01-06

Abstract

A scroll compression mechanism and a scroll compressor. The scroll compression mechanism comprises: a movable scroll (20); and a fixed scroll assembly comprising a fixed scroll (30, 30a, 30b) and a cover plate (100, 100a, 100b), the fixed scroll (30, 30a, 30b) comprising a fixed scroll end plate (32, 32a), and the cover plate (100, 100a, 100b) being fixed on one side of the fixed scroll end plate (32, 32a), so that a central high-pressure recess (36) capable of being in fluid communication with a central compression cavity is defined between the cover plate (100, 100a, 100b) and the fixed scroll end plate (32, 32a), and a back pressure cavity (70) is formed on the side of the cover plate (100, 100a, 100b) facing away from the fixed scroll (30, 30a, 30b); the fixed scroll assembly being further provided with a medium-pressure channel, the medium-pressure channel enabling a middle compression cavity to be in fluid communication with the back pressure cavity (70); a sealing reinforcing structure for limiting a sealing reinforcing area being provided between the cover plate (100, 100a, 100b) and the fixed scroll end plate (32, 32a); the medium-pressure channel penetrating through the sealing reinforcing area so as to prevent a working fluid from leaking from the central high-pressure recess (36) to the medium-pressure channel. According to the scroll compression mechanism, the wear failure of the scroll compression mechanism can be prevented, the service life of the scroll compression mechanism is prolonged, and the use performance of the scroll compression mechanism is improved.

Description

Scroll Compression Mechanisms and Scroll Compressors

This application claims the priority of the following Chinese patent applications: the Chinese patent application with the application number 202010603159.8 and the invention-creation title "Scroll Compression Mechanism and Scroll Compressor" filed with the China Patent Office on June 29, 2020; filed in 2020 On June 29, 2019, the Chinese patent application with the application number of 202021231482.9 and the invention and creation name "Scroll Compression Mechanism and Scroll Compressor" was submitted to the China Patent Office. The entire contents of these patent applications are incorporated herein by reference.

technical field

The present disclosure relates to the technical field of scroll compressors, and more particularly, to scroll compression mechanisms and scroll compressors.

Background technique

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

Compressors may be used in application systems that require different pressures such as air conditioning systems, cold storage systems, etc., so the discharge pressure of the compression chamber (the maximum pressure in the compression chamber) may be greater than the pressure required by the specific application system, that is over-compression. In order to reduce or prevent overcompression of the working fluid, compressors with variable volume ratio functions have been developed.

In compressors with variable volume ratio function, usually, the fixed scroll adopts a split design including a cover plate. In such a split fixed scroll, there is a problem that the scroll compression mechanism is prone to wear and failure, so there is a need to provide an improved scroll compression mechanism.

SUMMARY OF THE INVENTION

An object of one or more embodiments of the present disclosure is 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 prolonged, and the scroll compression mechanism can be improved. Use performance.

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

According to an aspect of the present disclosure, there is provided a scroll compression mechanism, comprising: an orbiting scroll; and a fixed scroll assembly including a fixed scroll and a cover, the fixed scroll and the fixed scroll The orbiting scroll is engaged to define a series of compression chambers, the series of compression chambers includes a central compression chamber and an intermediate compression chamber, the fixed scroll includes a fixed scroll end plate, and the cover plate is fixed to the fixed scroll one side of the end plate, so that a central high pressure recess that can be fluidly communicated with the central compression chamber is defined between the cover plate and the fixed scroll end plate, and a central high pressure recess is defined between the cover plate and the fixed scroll end plate, and the cover plate faces away from the fixed scroll A back pressure chamber is provided on one side of the fixed scroll assembly, and a middle pressure channel is also provided on the fixed scroll assembly, and the middle pressure channel fluidly communicates the middle compression chamber with the back pressure chamber. A seal reinforcement structure is provided between the plate and the fixed scroll end plate, the seal reinforcement structure defines a seal reinforcement area, and the medium pressure passage passes through the seal reinforcement area, thereby preventing the working fluid from flowing from the central high pressure The recess leaks into the medium pressure channel.

According to an aspect of the present disclosure, the medium pressure passage includes a medium pressure exhaust hole provided in the fixed scroll end plate and a cover plate exhaust hole provided in the cover plate, and the seal reinforcement structure includes A holed fastener with a longitudinal through hole is provided, the holed fastener passes through the cover plate exhaust hole and is fastened in the medium pressure exhaust hole, so that in the holed fastener and the surrounding area define the seal enhancement area and allow the hole fastener to allow the intermediate compression chamber to communicate with the back plate while securing the cover plate to the fixed scroll end plate. The pressure chambers are in fluid communication via the longitudinal through holes.

According to an aspect of the present disclosure, the seal-enhancing structure further includes a sealing gasket or a sealing ring disposed at least around the perforated fastener.

According to an aspect of the present disclosure, the fixed scroll assembly is further provided with a main fastener, the main fastener is arranged radially outside the medium pressure passage and fixes the cover plate to the fixed scroll Swivel end plate.

According to an aspect of the present disclosure, the seal reinforcement structure includes a first seal ring disposed on the radially inner side of the medium-pressure passage and a second seal ring on the radially outer side of the medium-pressure passage, such that in the first The seal enhancement region is defined between a seal ring and the second seal ring.

According to an aspect of the present disclosure, the fixed scroll assembly is further provided with a main fastener, the main fastener and the intermediate pressure passage are both located in the seal enhancement region and the main fastener attaches the The cover plate is secured to the fixed scroll end plate.

According to an aspect of the present disclosure, in the seal enhancement region, one of a surface of the cover plate facing the fixed scroll end plate and a surface of the fixed scroll end plate facing the cover plate Or both are provided with an annular air guide groove, the medium pressure channel includes a medium pressure exhaust hole arranged in the fixed scroll end plate and a cover plate exhaust hole arranged in the cover plate, the Both the medium pressure exhaust hole and the cover plate exhaust hole are opened in the air guide groove.

According to an aspect of the present disclosure, the main fasteners are plural and uniformly arranged in the circumferential direction.

According to an aspect of the present disclosure, a portion of the intermediate pressure passage disposed in the fixed scroll end plate includes a first axial section connected to the intermediate compression chamber, opening to the fixed scroll end plate The second axial section of the surface facing the cover plate, and the transverse connecting 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 fixed scroll end plate, and a variable volume ratio orifice for selectively opening and closing the variable volume ratio orifice is provided in the central high pressure recess. one-way valve.

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

The compressor structure according to the present disclosure can prevent the wear failure of the scroll compression mechanism, prolong the service life of the scroll compression mechanism and improve its use performance.

Description of 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 cross-sectional view schematically showing a compressor according to a comparative example;

2 is a cross-sectional view schematically showing a compressor fixed scroll assembly according to a comparative example;

3 is an exploded perspective view schematically showing a compressor fixed scroll assembly according to a comparative example;

4a and 4b are respectively a cross-sectional view and an exploded perspective view schematically illustrating a fixed scroll assembly of a compressor according to a first embodiment of the present disclosure;

5 is a top view schematically showing an alternative arrangement of seals of the fixed scroll assembly of the compressor according to the first embodiment of the present disclosure;

6 is a cross-sectional view schematically illustrating a fixed scroll assembly of a compressor according to a second embodiment of the present disclosure;

7 is an exploded perspective view schematically showing a fixed scroll assembly of a compressor according to a second embodiment of the present disclosure;

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

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

detailed description

The following descriptions of various embodiments of the present disclosure are exemplary only, and in no way limit the present disclosure and its application or usage. The same reference numerals are used to denote the same components in the various drawings, and thus the configuration of the same components will not be described repeatedly.

A compressor with a variable volume ratio function according to a comparative example will be described below with reference to FIGS. 1-3 , wherein FIG. 1 is a cross-sectional view schematically showing the compressor according to the comparative example; FIG. 2 is a schematic A cross-sectional view showing a compressor fixed scroll assembly according to a comparative example; and FIG. 3 is an exploded perspective view schematically showing the compressor fixed scroll assembly according to the comparative example.

As shown in FIG. 1 , the scroll compressor 1 includes a substantially closed casing 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 portion 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 plate 14 and the top cover 12 constitutes the fluid discharge chamber 13 , and the space between the partition plate 14 , the body portion and the bottom cover constitutes the fluid suction chamber 11 .

A scroll compression mechanism and a drive mechanism for driving the scroll compression mechanism are provided in the casing 10 . The compression mechanism sucks fluid from the fluid suction chamber 11 of the housing 10 and compresses the fluid and discharges the fluid into the fluid discharge chamber 13 of the housing 10 . Referring to Figure 1, the compression mechanism may include, for example, a fixed scroll assembly 30 and an orbiting scroll 20. The orbiting scroll 20 includes an orbiting scroll end plate and a spiral orbiting scroll formed on one side of the orbiting scroll end plate. As shown more clearly in FIG. 2 , the fixed scroll assembly 30 includes a fixed scroll end plate 32 and a helical fixed scroll 34 formed on one side of the fixed scroll end plate. The fixed scroll end plate 32 includes a fixed scroll end plate 32 formed The main exhaust port 50 at the substantially central position of the fixed scroll end plate, the variable volume ratio orifice 52 located radially outside the main exhaust port 50 , and the intermediate pressure located radially outside the variable volume ratio orifice 52 Exhaust hole 54 .

As shown in FIG. 2 , the fixed scroll assembly 30 further includes a cover plate 100 . The cover plate 100 is disposed on the side of the fixed scroll end plate 32 opposite to the scroll 34 and fixed on the fixed scroll end plate 32 . Specifically, as shown in FIG. 3 , a plurality of fixing holes 128 are formed on the cover plate 100 , and a plurality of fixing holes 114 corresponding to the above-mentioned fixing holes 128 are formed on the fixed scroll end plate 32 . Fasteners 124 extend through these securing

holes

128 and 114 to secure the cover plate 100 to the fixed scroll assembly 30, and the fasteners 124 may be provided in multiples and evenly distributed on the cover plate to apply a uniform tightening force . As shown in FIG. 2 , the cover plate 100 is further formed with a cover plate exhaust hole 140 corresponding to the medium pressure exhaust hole 54 , and the working fluid in the intermediate compression chamber C3 can be exhausted through the medium pressure exhaust hole 54 and the cover plate exhaust hole 54 . The medium pressure channel of the hole 140 flows to the back pressure chamber 70 . The fixing hole 114 is provided on the outer periphery of the fixed scroll end plate 32, and a central high-pressure recess 36 is provided on the radially inner side of the fixing hole 114. In addition, as shown in FIG. 2, the central high-pressure recess 36 is in fluid communication with the main exhaust port 50. And selectively in fluid communication with the variable volume ratio orifice 52, that is, the working fluid within the central high pressure recess 36 is at a high exhaust pressure. The variable volume ratio orifice 52 is provided with a one-way valve (FIG. 2 shows only a single variable volume ratio orifice, but it is understood that multiple variable volume ratio orifices may be formed as required). The one-way valve allows fluid flow from the compression chamber to the central high pressure recess 36 and prevents fluid flow from the central high pressure recess 36 to the compression chamber. The one-way valve may include a valve plate that covers the variable volume ratio orifice and a valve stop that prevents excessive deformation of the valve plate. The one-way valve may be secured into the fixed 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 annular wall and the outer annular wall. The inner annular wall 110 circumscribes a central cavity 120 which is in fluid communication with the central high pressure recess 36 . The back pressure chamber 70 is constituted by a space surrounded by the inner annular wall 110 , the outer annular wall 130 and the connecting portion 150 and is closed by a sealing member disposed therein. As shown in FIG. 2 , the back pressure chamber 70 is in fluid communication with the intermediate compression chamber C3 through the medium pressure exhaust hole 54 , thereby forming a force for pressing the fixed scroll assembly 30 toward the movable scroll 20 . The pressure can effectively compress the fixed scroll assembly 30 and the movable scroll 20 together.

During operation of the compressor 1, the 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 compression of the radially outermost in the compression chamber The working fluid pressure in the cavity is the smallest, and the radial innermost compression cavity, that is, the central compression cavity C1 at the central position of the scroll, has the largest working fluid pressure, and is located between the radially outermost position and the innermost position. The middle compression cavity C3 The working fluid 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 fixed scroll end plate 32 through the main exhaust port 50 . However, in the over-compressed state, the compression mechanism compresses the working fluid to a pressure higher than that required by the application system (such as an air-conditioning system, a cold storage system, a low-temperature refrigeration system, etc.), and therefore, the compressor does not perform in an over-compressed state. necessary work. To prevent overcompression, fluid may be discharged to the central high pressure recess 36 through the variable volume advance orifice 52 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 system, the one-way valve can open the variable volume ratio orifice 52 so that the fluid in that compression chamber is directly discharged without overcompression.

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, and the space radially outside of the fixed scroll end plate 32 is located in the fluid suction cavity and has a pressure equal to the compressor discharge pressure. The lower pressure of the suction pressure, while the back pressure chamber 70 is in fluid communication with the intermediate pressure vent 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 fixed scroll end plate 32 , a sealing gasket 60 is provided between the cover plate 100 and the fixed scroll end plate 32 . An exhaust port 64 and a fixing hole 66 are formed on the sealing gasket 60 , and the exhaust port 64 and the fixing hole 66 are respectively aligned with the medium pressure exhaust hole 54 and the fixing hole 114 of the fixed scroll end plate 32 .

As specifically shown in FIG. 3 , a plurality of fasteners 124 secure the cover plate 100 and the gasket 60 to the fixed scroll assembly 30 . The tightening force exerted by the fasteners 124 sandwiches the gasket 60 between the fixed scroll end plates 32 of the fixed scroll assembly 30 to seal the interface therebetween. However, in practical use of the compressor, there is a problem of scroll failure due to wear between the fixed scroll and the movable scroll, which adversely affects the service life and compression performance of the compressor.

After repeated research, the inventor of the present application found that this problem is caused by the relative position of the fastener and the medium pressure vent. Specifically, on the one hand, fasteners, such as screws, are typically arranged on the outer periphery of the fixed scroll end plate 32 to provide sufficient space for installing a one-way valve to selectively open the variable volume ratio orifice and to allow The fasteners will not interfere with the proper operation of the check valve. On the other hand, in order to provide sufficient back pressure to the back pressure chamber 70, the medium pressure vent hole 54 is generally located radially inward with respect to the fastener (or the fixing hole for the fastener). This results in the relative offset between the fastener and the medium-pressure vent hole in the radial direction. The inventors of the present application have found through simulation experiments that the radial offset between the fastener and the medium-pressure vent hole leads to A portion of the gasket is not sufficiently tightened to effectively seal the interface between the fixed scroll end plate and the cover plate, resulting in fluid leakage. Specifically, a portion of the sealing gasket located near the medium-pressure vent hole receives insufficient tightening force, which causes the high-pressure working fluid located in the recess to leak into the medium-pressure vent hole 54 and further leak into the back pressure cavity 70 . The high-pressure fluid increases the pressure of the back pressure chamber 70 , which further causes a substantial increase in the axial pressure of the fixed scroll assembly 30 pressing toward the movable scroll 20 , thereby causing wear between the scrolls.

In order to solve the above problems, the present inventors conceived an improved compressor structure, which can increase the sealing between the strong cover plate and the fixed scroll end plate, thereby preventing scroll wear caused by leakage of high-pressure working fluid. Specifically, a sealing reinforcement structure is provided in the contact area between the cover plate and the fixed scroll end plate, and the sealing reinforcement structure defines a sealing reinforcement area here, and the medium pressure channel including the medium pressure exhaust hole passes through the sealing reinforcement area, so as to prevent the leakage of working fluid from the central high pressure recess to the back pressure cavity through the contact area by reinforced sealing of the medium pressure exhaust hole.

4a and 4b respectively show a cross-sectional view and an exploded perspective view of the fixed scroll assembly of the compressor according to the first embodiment of the present disclosure. The structure of the compressor according to the first embodiment of the present disclosure is basically the same as that of the compressor according to the comparative example, which will not be repeated here. The only difference is that the compressor of the first embodiment of the present disclosure further includes a Press the holed fastener 80 in the vent hole 54 . The holed fastener 80 may be secured in the medium pressure vent hole 54 in any suitable manner, such as a threaded connection, an interference fit, or the like. The perforated fastener 80 is formed with a longitudinal through hole in fluid communication with the medium pressure vent 54 and the back pressure cavity 70 . The tightening force exerted by the perforated fastener 80 tightly sandwiches the surrounding sealing gasket between the cover plate and the fixed scroll end plate, and the perforated fastener 80 and the gasket constitute a sealing reinforcement structure , in this way, the perforated fastener 80 can define a seal-enhanced area at its own location and its surrounding area, in which the perforated fastener 80 acts directly at the medium pressure vent 54, thus The tightening force of the sealing gasket located in the vicinity of the medium pressure exhaust hole 54 can be significantly increased, thereby preventing the high-pressure working fluid from leaking to the medium pressure exhaust hole 54 and then to the back pressure cavity 70, avoiding fixed scrolls and wear failure of the orbiting scroll. Thus, an improved solution with simple structure, strong operability and low cost is provided. Additionally, the tightening force exerted by the fastener can be further increased by increasing the size of the fastener (eg, increasing the size of the tightening head).

In the compressor of the first embodiment of the present disclosure, the sealing member is not limited to the one-piece sealing gasket 60 shown in FIG. 3 , but may take any other suitable form. Figure 5 shows a top view of a fixed scroll assembly provided with an alternative gasket, with some components of the fixed scroll removed for clarity. Referring to FIG. 5 , in place of the gasket, a first O-ring 62 b surrounding the medium-pressure vent hole 54 and a second O-ring 64 b disposed between the medium-pressure vent hole 54 and the fixing hole 114 may be used . In this case, the seal-enhancing structure includes a first O-ring 62b disposed around the medium-pressure passage in the contact area of the cover plate with the end of the fixed scroll, so that the first O-ring 62b and its inner area define out of the seal reinforcement area. Although an embodiment in which a gasket or a sealing ring is provided between the cover plate and the fixed scroll end plate is shown here, it is understood that the gap between the cover plate and the fixed scroll end plate is very small In some cases, the sealing gasket or the sealing ring can also be omitted, and the sealing between the cover plate and the end of the fixed scroll can be directly maintained by the fasteners 80 with holes and the main fasteners 124 . In addition, it should also be noted that although it is schematically described in the present application that the central high pressure recess 36 is formed on the top surface of the fixed scroll end plate 32, those skilled in the art should understand that the present disclosure is not limited thereto, for example, it can be Alternatively, the concave portion is formed on the lower side of the cover plate 100, and the top surface of the fixed scroll end plate 32 is formed in a flat shape. Alternatively, recesses may be formed on both the top surface of the fixed scroll end plate 32 and the lower side of the cover plate 100 . As long as it is possible to provide a high pressure discharge region between the cover plate and the fixed scroll end plate with a pressure equal to the discharge pressure of the scroll compressor, the high pressure discharge region is in fluid communication with the main discharge port 50 and selectively with The variable volume ratio orifice 52 is in fluid communication.

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

The fixed scroll assembly 30 a has substantially the same structure as the fixed scroll assembly 30 according to the first embodiment and the comparative example, and only the differences will be described below. As shown in FIG. 6 , the portion of the intermediate pressure passage disposed on the fixed scroll end plate 32a includes a first axial section 542a, a second axial section 544a, and a transverse connecting section 546a. The first axial section 542a extends in the axial direction of the compressor and connects the intermediate compression chamber C3. The second axial section 544a extends in the axial direction to the surface of the fixed scroll end plate 32a facing the cover plate 100 and forms the intermediate pressure exhaust hole 54a, the intermediate pressure exhaust hole 54a and the fixing hole 114 (as shown in FIG. 7 ). The radial distance to the axis of the fixed scroll is approximately the same, so the medium pressure exhaust hole 54a and the fixed hole 114 are located in the same annular area. The transverse connection 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 544a. The first axial section 542a extends through the fixed scroll end plate 32a and is provided with a plug 210 at its end proximate the central high pressure recess 36 to prevent leakage of working fluid from the medium pressure exhaust passage to the central high pressure recess 36 . The transverse connection section 546a has an outer end penetrating the fixed scroll end plate 32a, the intersection point of the transverse connection section 546a and the second axial section 544a is P, and the transverse connection section 546a is provided with a radially outer side of the intersection P. Plug 220 to prevent leakage of working fluid from the medium pressure exhaust passage to the fluid suction chamber. Since the part of the transverse connecting section 546 located on the radially inner side of the intersection P is necessary to form the medium-pressure exhaust passage, and the part located on the radially outer side of the intersection P is an invalid part due to the processing process, it is preferable that the plug is 320 may be placed in the dead portion near the intersection point P to reduce the clearance volume of the compressor.

Referring to FIG. 7 , an annular air guide groove 310 is formed on the fixed scroll end plate, and the fixing hole 114 and the medium pressure exhaust hole 54a are located in the air guide groove 310 . A first sealing groove 320 and a second sealing groove 330 for accommodating the first sealing ring 410 and the second sealing ring 420 are respectively provided on the radially outer side and the inner side of the air guide groove 310 . The first sealing groove 320 and the second sealing groove 330 may be arranged adjacent to the air guide groove 310 . The sealing ring may illustratively include an O-ring and any other suitable sealing gasket.

The structure of the cover plate 100a is basically the same as that of the cover plate 100, and the only difference is that the radial distance between the cover plate exhaust hole 140a of the cover plate and the fixed hole 128 to the axis of the fixed scroll is the same.

6 and 7, in the fixed scroll assembly 30a according to the second embodiment of the present disclosure, the working fluid of the intermediate compression chamber C3 flows from the first axial section 542a to the transverse connecting section 546a, and thereafter through the second The two axial sections 544a flow into the air guide groove 310, and finally the working fluid enters the back pressure chamber 70 from the air guide groove 310 through the cover plate exhaust hole 140a (not shown in FIG. 6). While the radially inner first seal ring 410 prevents the high pressure working fluid of the central high pressure recess 36 from flowing to the air guide groove 310 , and the radially outer second seal ring 420 prevents the medium pressure working fluid in the air guide groove 310 from flowing to the suction pressure chamber.

In the fixed scroll according to the second embodiment of the present disclosure, the first seal ring 410 and the second seal ring 420 are arranged in a region around the main fastener 124, and the main fastener 124 may have an impact on the first seal ring and the second seal ring 420. The two seal rings and the area between them exert sufficient tightening force, so the seal reinforcement structure including the first seal ring and the second seal ring defines a seal reinforcement area between the first seal ring and the second seal ring. The medium pressure channel including the medium pressure vent hole 54a is located within this seal enhancement area. Specifically, as shown in FIG. 7, since the radial distance between the medium pressure exhaust hole 54a and the fixed hole 114 to the axis of the fixed scroll is the same without radial offset, the medium pressure exhaust hole 54a can be located in the first In the seal-enhancing area between the first sealing ring and the second sealing ring. In this way, the medium pressure passage including the medium pressure vent hole 54a is made to pass through the seal reinforcement area, thereby preventing the leakage of the working fluid from the central high pressure recess to the back pressure cavity via the contact area by reinforced sealing of the medium pressure vent hole, Thereby, the wear failure of the fixed scroll and the movable scroll is prevented.

In addition, in the fixed scroll according to the second embodiment of the present disclosure, since the annular air guide groove 310 is used to introduce the working fluid in the intermediate compression chamber into the back pressure chamber 70, the middle pressure discharge of the fixed scroll end plate 32a The air hole 54a and the cover plate exhaust hole 140a of the cover plate can be arranged at any position in the circumferential direction, without using a foolproof design for alignment, which simplifies the assembly process, and can also improve the versatility of the cover plate and the sealing gasket. Specifically, in the fixed 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 , the intermediate pressure exhaust hole 54 of the fixed scroll end plate 32 needs to be , the exhaust port 64 of the sealing gasket 60 and the cover plate exhaust hole of the cover plate 100 are aligned to form a medium pressure channel. To this end, it is necessary to provide corresponding foolproof designs on the sealing gasket 60 and the fixed scroll end plate 32. FIG. 8 shows the foolproof design of the sealing gasket and the fixed scroll end plate in the compressor according to the comparative example. For example, as shown in FIG. 8 , the gasket 60 has a foolproof feature 68 on it, and the fixed scroll end plate 32 has a corresponding foolproof feature 38 so that the medium pressure exhaust hole 54 of the fixed scroll end plate 32 and the The vent holes in the gasket 60 are aligned. Due to the different positions of the medium pressure exhaust holes of different fixed scrolls, the cover plate and gasket are individually designed for specific fixed scrolls to match the design of different medium pressure exhaust holes, which makes the cover plate and gasket Not universal. In the design stage of the scroll concept, in order to improve the performance of the compressor and reduce the axial force of the scroll, the position of the medium pressure exhaust hole will be continuously adjusted and changed, and a new gasket needs to be customized every time the position of the exhaust hole is adjusted and changed. and cover plates, which significantly increase design costs and reduce the speed of new product development. At the same time, with the development of new products, the number of cover plates and sealing gaskets is increasing. The shape characteristics of these cover plates and sealing gaskets are very different, which can easily cause mixing and affect normal production. In the fixed scroll according to the second embodiment of the present disclosure, since the medium-pressure exhaust holes of the fixed scroll and the cover plate can be arranged at any position in the circumferential direction without being aligned with each other, the same set of cover plate and gasket The plate can be applied to fixed scrolls with different medium pressure exhaust holes, so that the position of the fixed scroll medium pressure exhaust holes can be easily adjusted without the need to replace new sealing gaskets and cover plates.

FIG. 9 shows a cross-sectional view of a fixed scroll assembly 30b according to a third embodiment of the present disclosure. The fixed scroll assembly 30b is basically the same in structure as the fixed scroll assembly 30a according to the second embodiment of the present disclosure, except that the air guide groove 310b is formed on the lower side of the cover plate 100b, and the fixed scroll end The top surface of the plate 32 is formed in a plane shape, which is favorable for the spatial layout of the upper plane of the fixed scroll and reduces the difficulty of processing and manufacturing the fixed scroll. Those skilled in the art should understand that the present disclosure is not limited thereto, and the air guide grooves may also be formed on the top surface of the fixed scroll end plate 32 and the lower side of the cover plate 100 at the same time.

Although various embodiments and modifications of the present disclosure have been specifically described above, those skilled in the art should understand that the present disclosure is not limited to the above-mentioned specific embodiments and modifications but may include other various possible combinations and combinations. . Other modifications and variations can be effected by those skilled in the art without departing from the spirit and scope of the present disclosure. All such modifications and variations fall within the scope of this disclosure. Furthermore, all components described herein may be replaced by other technically equivalent components.

Claims

A scroll compression mechanism, comprising:

an orbiting scroll (20); and

A fixed scroll assembly comprising a fixed scroll (30, 30a, 30b) and a cover plate (100, 100a, 100b), the fixed scroll in engagement with the orbiting scroll to define a series of compressions The series of compression chambers includes a central compression chamber (C1) and an intermediate compression chamber (C3), the fixed scroll includes fixed scroll end plates (32, 32a), and the cover plate is fixed to the fixed scroll One side of the swirl end plate (32, 32a), so that a central high pressure recess (36) that can be fluidly communicated with the central compression chamber is defined between the cover plate and the fixed scroll end plate, in the A back pressure chamber (70) is provided on the side of the cover plate away from the fixed scroll, and the fixed scroll assembly is further provided with a medium pressure channel, and the medium pressure channel connects the intermediate compression chamber with the back pressure cavity in fluid communication,

It is characterized in that a sealing reinforcement structure is provided between the cover plate and the fixed scroll end plate, the sealing reinforcement structure defines a sealing reinforcement area, and the medium pressure channel passes through the sealing reinforcement area, so as to The leakage of working fluid from the central high pressure recess to the medium pressure passage is prevented.
The scroll compression mechanism according to claim 1, wherein:

The medium pressure channel includes a medium pressure exhaust hole (54) arranged in the fixed scroll end plate and a cover plate exhaust hole (140) arranged in the cover plate, and the sealing strengthening structure includes a There is a holed fastener (80) with a longitudinal through hole, the holed fastener passes through the cover plate exhaust hole (140) and is fastened in the medium pressure exhaust hole, so that in the The holed fastener at and around the area defines the seal enhancement area and allows the holed fastener to allow the intermediate compression while securing the cover plate to the fixed scroll end plate A cavity is in fluid communication with the back pressure cavity via the longitudinal through hole.
The scroll compression mechanism according to claim 2, wherein:

The seal-enhancing structure further includes a sealing gasket or a sealing ring disposed at least around the perforated fastener.
The scroll compression mechanism according to claim 2, wherein:

The fixed scroll assembly is also provided with primary fasteners (124) that are disposed radially outside of the intermediate pressure passage and secure the cover plate to the fixed scroll end plate.
The scroll compression mechanism according to claim 1, wherein:

The seal strengthening structure includes a first seal ring (410) disposed on the radially inner side of the medium-pressure channel and a second seal ring (420) on the radially outer side of the medium-pressure channel, so that in the first The seal strengthening area is defined between the seal ring (410) and the second seal ring (420).
The scroll compression mechanism according to claim 5, wherein:

The fixed scroll assembly is also provided with a main fastener (124), the main fastener and the intermediate pressure channel are both located in the seal-enhancing area and the main fastener fixes the cover plate to the fixed scroll end plate.
The scroll compression mechanism according to claim 5, wherein:

In the seal enhancement region, one or both of the surface of the cover plate facing the fixed scroll end plate and the surface of the fixed scroll end plate facing the cover plate are provided with annular An air guide groove (310), the medium pressure channel includes a medium pressure exhaust hole (54) arranged in the fixed scroll end plate and a cover plate exhaust hole arranged in the cover plate, the middle pressure exhaust hole (54) Both the pressure vent hole and the cover plate vent hole are opened in the air guide groove.
The scroll compression mechanism according to claim 5, wherein:

The main fasteners are plural and uniformly arranged in the circumferential direction.
The scroll compression mechanism according to any one of claims 1 to 8, wherein:

The portion of the intermediate pressure passage disposed in the fixed scroll end plate includes a first axial section (542a) connected with the intermediate compression chamber, and a portion of the fixed scroll end plate that is open to the fixed scroll end plate and faces the A second axial section (544a) of the surface of the cover plate, and a transverse connecting section (546a) connecting said first axial section (542a) with said second axial section (544a).
The scroll compression mechanism according to any one of claims 1 to 8, wherein:

A variable volume ratio orifice (52) is provided in the fixed 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.
A scroll compressor, characterized in that the scroll compressor comprises the scroll compression mechanism according to any one of claims 1 to 10.