Compression mechanism

Abstract

The present disclosure provides a compression mechanism including: a first scroll including a first scroll end plate and a first wrap formed on one side of the first scroll end plate; the second vortex comprises a second vortex end plate and a second vortex roll formed on one side of the second vortex end plate, an exhaust port is formed in the second vortex end plate, and the second vortex and the first vortex are matched to form a series of compression cavities between the second vortex and the first vortex; and a valve assembly including a valve plate disposed above the exhaust port and capable of selectively opening or closing the exhaust port, and a valve body configured to limit a displacement range of the valve plate and at least one valve plate fixed to the valve body at a central portion of the valve body. According to the compression mechanism with the variable volume ratio function, the installation space is small, and the structure is simple.

Description

Technical Field

[0001] The present disclosure relates to the technical field of scroll compressors, and more particularly, to a compression mechanism of a scroll compressor with a variable volume ratio function. Background Art

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

[0003] The compressor may be used in application systems that require different pressures, such as air conditioning systems and cold storage systems. Therefore, 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 occurs. In the case of over-compression, the fluid compressed to the discharge pressure will be reduced to the pressure required by the application system after being discharged from the compression chamber. Therefore, the compressor does unnecessary work, which will reduce the efficiency of the compressor.

[0004] In order to reduce or prevent over-compression of the working fluid, a compressor with a variable volume ratio function has been developed. This compressor can use a bypass valve set in the secondary exhaust port to achieve a variable volume ratio, that is, it can operate at a low volume ratio when the system pressure is low and operate at a high volume ratio when the system pressure is high, thereby effectively avoiding over-compression and improving the efficiency of the compressor. However, in the field of compressors, there are still technical problems such as the inability to set a bypass valve due to limited installation space. Summary of the invention

[0005] An object of one or more embodiments of the present disclosure is to provide a compression mechanism of a compressor that can effectively implement a variable volume ratio function in a limited installation space.

[0006] According to one aspect of the present disclosure, a compression mechanism is provided, which includes: a first scroll, the first scroll including a first scroll end plate and a first scroll formed on one side of the first scroll end plate; a second scroll, the second scroll including a second scroll end plate and a second scroll formed on one side of the second scroll end plate, an exhaust port being formed in the second scroll end plate, the second vortex and the first vortex cooperating to form a series of compression chambers therebetween; and a valve assembly, characterized in that the valve assembly includes: a valve plate, the valve plate is arranged above the exhaust port and can selectively open or close the exhaust port, and a valve body, the valve body is configured to limit the displacement range of the valve plate and at least one of the valve plates is fixed to the valve body at the central portion of the valve body.

[0007] According to one aspect of the present disclosure, at least one of the valve plates includes a plurality of sub-valve plates, each of which includes a fixed end fixed to the central portion and a movable end extending from the fixed end in a direction toward the periphery of the valve body.

[0008] According to one aspect of the present disclosure, at least one fixed end of the sub-valve piece may be separately fixed to the central portion.

[0009] According to one aspect of the present disclosure, the fixed ends of the plurality of sub-valve sheets are integrally merged together to form a merged portion.

[0010] According to one aspect of the present disclosure, the plurality of sub-valve plates are symmetrically arranged with the confluence portion as the center.

[0011] According to one aspect of the present disclosure, the valve body includes an annular body, which is formed with alternating positioning portions and limiting portions, the thickness of the limiting portions is smaller than the thickness of the positioning portions and the limiting portions are configured to limit the displacement range of the movable end of the sub-valve plate.

[0012] According to one aspect of the present disclosure, the valve body also includes a connecting portion extending through the central portion of the valve body and connected to the annular body of the valve body, an exhaust channel is formed between the connecting portion and the annular body, and the connecting portion is formed with a protrusion on the side facing the valve plate, and the protrusion is configured to surround the outer periphery of the confluence of the valve plate to prevent the valve plate from rotating.

[0013] According to one aspect of the present disclosure, the valve assembly further includes a fastener, a first fastening hole is formed at the confluence portion of the valve plate, a second fastening hole is formed at the central portion of the valve body, and the fastener extends through the first fastening hole and the second fastening hole to fasten the valve plate to the valve body.

[0014] According to one aspect of the present disclosure, the valve assembly further includes a valve plate, the valve plate being disposed between the valve sheet and the second scroll end plate, the valve plate including an anti-impact portion corresponding to a shape of the valve sheet.

[0015] According to one aspect of the present disclosure, an orifice is formed at the center of the impact-proof portion, and the orifice is a stepped orifice, and the fastener extends through the stepped orifice to fasten the valve plate, the valve body and the valve disc into one, or the orifice is a straight orifice, and the head of the fastener is arranged in the straight orifice, so that the fastener only fastens the valve body and the valve disc into one.

[0016] According to one aspect of the present disclosure, the valve assembly further includes a positioning pin extending through the pin hole of the valve body and extending into the pin hole of the fixed scroll end plate to prevent the valve body from circumferential displacement.

[0017] According to one aspect of the present disclosure, the valve assembly further includes a positioning member fixed to the fixed scroll and configured to abut against the valve body to fix the axial positions of the valve plate and the valve body.

[0018] According to one aspect of the present disclosure, the positioning member is formed by a spring, and the spring abuts against the valve body to apply elastic force to the valve body and the valve plate to fix the axial position of the valve body and the valve plate.

[0019] According to one aspect of the present disclosure, the exhaust port includes a main exhaust port and a secondary exhaust port, the main exhaust port is fluidly connected to a central compression chamber in the series of compression chambers, and the secondary exhaust port is fluidly connected to an intermediate compression chamber in the series of compression chambers located radially outside the central compression chamber, and the valve plate selectively opens or closes the secondary exhaust port.

[0020] According to one aspect of the present disclosure, the second scroll end plate is provided with an annular wall on the side opposite to the fixed scroll, the main exhaust port and the auxiliary exhaust port are formed in an exhaust area defined by the annular wall, and the valve assembly is centrally arranged on the radial inner side of the annular wall.

[0021] According to one aspect of the present disclosure, the main exhaust port includes a first main exhaust port part and a second main exhaust port part which are connected to each other, the first main exhaust port part is connected to the central compression chamber, the second main exhaust port part is connected to the exhaust area and the flow area of ​​the second main exhaust port part is greater than the flow area of ​​the first main exhaust port part.

[0022] According to one aspect of the present disclosure, the secondary exhaust port includes a first axial section, a second axial section, and a transverse connecting section, the first axial section extends along the axial direction of the compression mechanism and is connected to the intermediate compression chamber, the second axial section extends along the axial direction to the surface of the second scroll end plate facing the valve assembly, and the transverse connecting section extends along the transverse direction perpendicular to the axial direction of the compression mechanism and connects the first axial section and the second axial section.

[0023] According to one aspect of the present disclosure, the secondary exhaust port includes a first axial section and a second axial section, the first axial section extends in the axial direction of the compression mechanism and is connected to the intermediate compression chamber, the second axial section extends in the axial direction to the surface of the second scroll end plate facing the valve assembly, the first axial section is directly connected to the second axial section and partially overlaps in the radial direction.

[0024] The compressor structure according to the present disclosure can not only save the installation space of the bypass valve but also increase the flow area of ​​the auxiliary exhaust port, thereby improving the efficiency of the compression mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.

[0026] Figure 1 is a longitudinal cross-sectional view schematically showing a compressor according to a first exemplary embodiment of the present disclosure;

[0027] Figure 2 A cross-sectional view schematically showing a fixed scroll and a bypass valve assembly of a compressor according to a first exemplary embodiment of the present disclosure;

[0028] Figure 3 A perspective exploded view schematically showing some components of a bypass valve assembly according to a first exemplary embodiment of the present disclosure;

[0029] Figure 4 To schematically illustrate an alternative configuration of a valve plate of a bypass valve assembly according to a first exemplary embodiment of the present disclosure;

[0030] Figure 5a and Figure 5b Schematically showing a top view and a bottom view of a valve body of a bypass valve assembly according to a first exemplary embodiment of the present disclosure, respectively;

[0031] Figure 6 Schematically shows a partial top view of a fixed scroll end plate according to a first exemplary embodiment of the present disclosure;

[0032] Figure 7 is a cross-sectional view schematically showing a bypass valve assembly of a compressor according to a second exemplary embodiment of the present disclosure;

[0033] Figure 8 is a perspective view schematically showing a valve plate of a bypass valve assembly according to a second exemplary embodiment of the present disclosure;

[0034] Fig. 9 is a cross-sectional view schematically showing a bypass valve assembly of a compressor according to a third exemplary embodiment of the present disclosure; Fig.10 To schematically illustrate an alternative arrangement of a secondary exhaust port of a compressor according to an exemplary embodiment of the present disclosure; and

[0035] Fig.11 and 12 The cross-sectional view and exploded perspective view schematically show a fixed scroll and a bypass valve assembly of a compressor according to an alternative embodiment of the present disclosure, respectively. DETAILED DESCRIPTION

[0036] The following description of the various embodiments of the present disclosure is merely exemplary and is by no means a limitation of the present disclosure and its application or usage. The same reference numerals are used to represent the same components in the various drawings, so the construction of the same components will not be described repeatedly.

[0037] The following will refer to Figure 1 An example compressor having a variable volume ratio is described. Figure 1 As shown, the compressor 1 may include a housing 20, a driving mechanism, a compression mechanism, a sealing assembly, and a valve assembly.

[0038] Specifically, the housing 20 may be composed of a substantially cylindrical body 22, a top cover 24 disposed at one end of the body 22, and a bottom cover 26 disposed at the other end of the body 22. A partition 30 is disposed between the top cover 24 and the body 22 to separate the internal space of the housing 20 into a fluid suction chamber 21 and a fluid discharge chamber 23. The space between the partition 30 and the top cover 24 constitutes the fluid discharge chamber 23, while the space between the partition 30, the body 22, and the bottom cover constitutes the fluid suction chamber 21. An air intake joint for inhaling fluid is disposed on one side of the fluid suction chamber 21, and an air discharge joint for discharging compressed fluid is disposed on one side of the fluid discharge chamber 23.

[0039] A compression mechanism and a driving mechanism for driving the compression mechanism are provided in the housing 20. The compression mechanism sucks fluid from the fluid suction chamber 21 of the housing 20 and discharges the fluid into the fluid discharge chamber 23 of the housing 20 after compressing the fluid. Figure 1 The compression mechanism may include, for example, a movable scroll 50 and a fixed scroll 40 (herein, the scroll without an exhaust port is referred to as the first scroll and the scroll with an exhaust port is referred to as the second scroll. Figure 1In the illustrated embodiment, the movable scroll 50 and the fixed scroll 40 are also referred to as the first scroll 50 and the second scroll 40, respectively. The movable scroll 50 includes a movable scroll end plate 54 and a spiral movable scroll 56 formed on one side of the movable scroll end plate (herein, the movable scroll end plate 54 and the movable scroll 56 are also referred to as the first scroll end plate 54 and the first scroll 56). The fixed scroll 40 includes a fixed scroll end plate 44 and a spiral fixed scroll 46 formed on one side of the end plate (herein, the fixed scroll end plate 44 and the fixed scroll 46 are also referred to as the second scroll end plate 44 and the second scroll 46), and the fixed scroll end plate 44 includes a main exhaust port 42 formed at a substantially central position of the end plate and a first secondary exhaust port 64 and a second secondary exhaust port 66 located radially outside the exhaust port 42. The fixed scroll 46 of the fixed scroll 40 and the movable scroll 56 of the movable scroll 50 mesh with each other to form a series of compression chambers therebetween, with the volume gradually decreasing and the pressure gradually increasing from the radial outside to the radial inside. Specifically, the pressure in the radially outermost compression chamber in the compression chamber is the smallest, the pressure in the radially innermost compression chamber, i.e., the central compression chamber at the center of the vortex, is the largest, and the multiple intermediate compression chambers located between the radially outermost position and the innermost position have an intermediate pressure between the maximum pressure and the minimum pressure. The main exhaust port 42 can be in fluid communication with the central compression chamber (the fluid communication described in this section corresponds to direct fluid communication), and the first auxiliary exhaust port 64 and the second auxiliary exhaust port 66 can be in fluid communication with the first intermediate compression chamber and the second intermediate compression chamber located on both sides of the central compression chamber, respectively.

[0040] In order to achieve axial sealing between the top of the fixed scroll 46 of the fixed scroll 40 and the movable scroll end plate 54 of the movable scroll 50, and between the top of the movable scroll 56 of the movable scroll 50 and the fixed scroll end plate 54 of the fixed scroll 40, generally, a back pressure chamber 70 is provided on the side of the fixed scroll end plate 54 of the fixed scroll 40 opposite to the fixed scroll 46. More specifically, an inner annular wall 43 and an outer annular wall 45 are formed on the fixed scroll end plate 54. The inner annular wall 43 defines an exhaust area including a main exhaust port 42 and auxiliary exhaust ports 64, 66. The back pressure chamber 70 is formed by the space surrounded by the fixed scroll end plate 54, the inner annular wall 43 and the outer annular wall 45 and is closed by a sealing assembly disposed therein, which isolates the medium pressure back pressure chamber area from the high pressure exhaust area and the low pressure suction area. The back pressure chamber 70 is fluidly connected to a medium pressure chamber in the compression chamber between the movable scroll 50 and the fixed scroll 40 through an axially extending through hole (not shown) formed in the fixed scroll end plate 54, thereby forming a force that squeezes the fixed scroll 40 toward the movable scroll 50. The pressure in the back pressure chamber 70 can effectively press the fixed scroll 40 and the movable scroll 50 together.

[0041] Generally, a bypass valve can be provided in the scroll mechanism to prevent over-compression of the working fluid. During the operation of the compressor 1, the working fluid is sucked into the compression mechanism and is compressed as it flows from the radially outermost position to the radially innermost position. The compressed fluid is discharged to the exhaust area defined by the inner annular wall 43 through the main exhaust port 42, and then can be discharged to the discharge chamber 23 via a one-way valve, for example, provided at the central position of the partition 30. In the event of over-compression, the fluid can be discharged to the exhaust area in advance through the secondary exhaust port before reaching the radially innermost position. Specifically, when the pressure of the fluid in the compression chamber at the radially middle position is greater than the fluid pressure in the discharge chamber 23 (i.e., over-compression occurs), the bypass valve selectively opens the secondary exhaust ports 64, 66, thereby allowing the fluid to be discharged in advance. When the pressure of the fluid in the compression chamber contained in the radially middle position is less than the fluid pressure in the discharge chamber 23, the bypass valve selectively closes and seals the secondary exhaust ports 64, 66.

[0042] In the compressor 1, in order to enable the back pressure chamber 70 to provide a stable and sufficient pressure to effectively prevent fluid leakage between the compression chambers, it is necessary to ensure that the back pressure chamber 70 has sufficient space, so the space inside the annular wall 43 is very limited. In particular, for a small-displacement scroll compressor, the space inside the annular wall 43 may only have a diameter of 20mm-30mm. In this case, since the volume of the bypass valve is relatively large relative to the scroll, there is a problem that it is difficult to fit the bypass valve to the inside of the annular wall 43 to achieve the variable volume ratio function.

[0043] A commonly used method is a split design, that is, the exhaust area and the back pressure chamber are divided into two parts, the upper and lower parts, by using a cover plate, so that the installation space of the bypass valve will not be as large as Figure 1 The compressor in the compressor is not restricted by the annular wall 43. However, in this split design, due to the presence of the upper cover plate, the fixed scroll is divided into two layers, the overall height of the fixed scroll is increased, and thus the height and volume of the compressor are increased accordingly, resulting in an increase in the production cost of the compressor. In addition, since the exhaust area between the cover plate and the fixed scroll end plate has a large pressure, there is a risk of fluid leakage due to the inability to achieve complete sealing between the cover plate and the fixed scroll end plate, which may lead to a decrease in the performance of the compressor. And because of the need to use additional cover plates, gaskets and corresponding fasteners, the structure is complicated and the production and processing costs are increased. Another way is to install multiple valves on the fixed scroll end plate, each valve is fixed to the fixed scroll end plate with a screw, but the number of valves installed in this way is small, the installation is laborious and the flow area of ​​the secondary exhaust port is small.

[0044] In order to solve the above problems, the inventors have conceived an improved compression mechanism, which can not only save the installation space required for the bypass valve but also increase the flow area of ​​the secondary exhaust port, thereby improving the efficiency of the compression mechanism.

[0045] Reference Figure 2 , a compression mechanism according to an exemplary embodiment of the present disclosure may include a bypass valve assembly 100 (hereinafter referred to as the valve assembly 100). The valve assembly 100 may include a valve body 120, and a valve plate 130. The valve plate 130 may be disposed above the secondary exhaust ports 64, 66 and may selectively open or close the secondary exhaust ports 64, 66. The valve body 120 may be configured to limit the displacement range of the valve plate 130 and the valve plate 130 may be fixed to the valve body 120 at the central portion of the valve body 120. The valve assembly 100 may be centrally disposed on the radially inner side of the annular wall 43 so that the central portion of the valve body 120 may coincide with the center of the annular wall 43.

[0046] like Figure 3 As shown, the valve plate 130 may include a plurality of sub-valve plates 132, each of which includes a fixed end 134 fixed to the central portion of the valve body and a movable end 136 extending from the fixed end 134 in a direction toward the periphery of the valve body. The plurality of sub-valve plates 132 may be integrally connected to the confluence portion 138 and the plurality of sub-valve plates 132 may be symmetrically arranged with the confluence portion 138 as the center. Figure 3 1 shows that the valve plate 130 includes two sub-valve plates 132, but it can be understood that the number of sub-valve plates 132 is not limited thereto and can be changed as needed, for example Figure 4 The valve plate includes 6 sub-valve plates. Figure 4 As shown, two groups of sub-valve sheets 132 are provided which are substantially diametrically opposed, the first group of sub-valve sheets includes a plurality of sub-valve sheets which are close to each other, and the second group of sub-valve sheets includes a plurality of sub-valve sheets which are close to each other, so that the valve sheet 130 can be well adapted to the structure which is provided with two groups of auxiliary exhaust ports which are substantially diametrically opposed. In addition, although an integrated valve sheet in which a plurality of sub-valve sheets are all connected to the confluence portion is shown here, it can be understood that a split design of separately manufactured sub-valve sheets can also be adopted, for example, the fixed end of at least one sub-valve sheet can be separately fixed to the central portion without being connected to the fixed ends of other sub-valve sheets as a whole.

[0047] Continue to refer to Figure 3, the valve body 120 may include an annular body 122, and the annular body 122 may be formed with alternating positioning portions 124 and limiting portions 126. The positioning portion 124 may have a uniform thickness to form a flat positioning surface, which abuts against the fixed scroll end plate 44 to firmly hold the valve body on the fixed scroll end plate. The thickness of the limiting portion 126 may be smaller than the thickness of the positioning portion 124, and the limiting portion 126 may be configured to limit the displacement range of the movable end 136 of the sub-valve plate 132. This arrangement of the annular body 122 can leave sufficient flow area for the secondary exhaust port, thereby ensuring both the firm retention of the valve body and the exhaust requirements of the fluid. The valve body 120 may also include a connecting portion 123 extending through the central portion of the valve body and connected to the annular body 122, and an exhaust channel 125 may be formed between the connecting portion 123 and the annular body 122, and the fluid can be discharged to the exhaust area via the exhaust channel. Refer to Figure 5b , the connecting portion 123 may be on the side facing the valve plate 130 ( Figure 2 A protrusion 128 is formed on the lower side of the valve plate (ie, a step is defined), and the protrusion 128 is configured to surround the outer periphery of the confluence portion 138 of the valve plate to prevent the valve plate 128 from rotating.

[0048] In the present disclosure, the valve plate 130 is not directly fixed to the fixed scroll end plate 44 , nor is there a direct positioning relationship with the fixed scroll end plate 44 through, for example, positioning pins 150 . Instead, the valve plate is fixed by being fixed to the valve body 130 .

[0049] Reference Figure 3 The valve assembly 100 may further include a fastener 140. The confluence portion 138 of the valve plate may be formed with a first fastening hole 137, the central portion of the valve body 120 may be formed with a second fastening hole 127, and the fastener 140 may extend through the first fastening hole 137 in a direction away from the fixed scroll end plate 44 and extend to the second fastening hole 127 to fasten the valve plate 130 to the valve body 120. Figure 2 Specifically, the head of the fastener 140 can abut against the valve plate 130 and extend toward the valve body 120, that is, extend in a direction opposite to the discharge direction of the fluid. Although the fastener 140 is exemplarily shown here to fix the valve body 120 and the valve plate 130, it can be understood that the present application is not limited thereto, and the valve body 120 and the valve plate 130 can also be fixed together by any other suitable method such as bonding, welding, etc.

[0050] like Figure 1 As shown, in the assembled state, the fixed end 134 of the valve plate 130 can be fixed to the central portion of the valve body 120, and the movable end 136 of the valve plate 130 can be selectively moved between an open position and a closed position to selectively open or close the auxiliary exhaust ports 64, 66. The limiting portion 126 can have an inclined surface to limit the displacement range of the movable end 136.

[0051] Reference Figure 3 , the valve assembly 100 may further include a positioning member 110. The positioning member 110 may be fixed to the inner annular wall 43 of the fixed scroll 40 and may be configured to abut against the valve body 120 to limit the axial position of the valve plate 130 and the valve body 120. Exemplarily, the positioning member 110 may be fixed to the inner thread of the inner annular wall 43 by an outer thread arranged on the outer periphery. Such an annular fastener may provide a uniform downward pressing fastening force to prevent the valve assembly 100 from overturning. Although it is exemplarily shown herein that the positioning member 110 is fixed to the fixed scroll by threads, it is to be understood that the present application is not limited thereto, and the positioning member 110 may also be fixed by any other suitable means such as interference fit, bonding, etc. In an alternative embodiment, the positioning member 110 may be omitted, and the valve body 120 may be directly fixed to the inner annular wall 43 of the fixed scroll. In another alternative embodiment, referring to Fig.11 and 12 , the valve assembly may include a spring 110A (e.g., a corrugated spring) instead of the positioning member 110. The spring 110A may be fixed to the inner annular wall 43 of the fixed scroll 40 and may be configured to abut against the valve body 120 to apply a downward elastic force to the valve body 120 and the valve plate 130, thereby pressing the valve body and the valve plate downward to fix the axial position of the valve plate 130 and the valve body 120.

[0052] Continue to refer to Figure 3 The valve assembly 100 may further include a positioning pin 150. The positioning pin 150 may extend through the pin hole 129 of the valve body 120 and extend to the pin holes 47, 48 ( Figure 6 ), thereby preventing the valve body 120 from circumferential displacement.

[0053] Reference Figure 2 In an exemplary embodiment according to the present disclosure, the main exhaust port 42 of the fixed scroll 40 includes a first main exhaust port portion 420 and a second main exhaust port portion 422 that are interconnected. The first main exhaust port portion 420 can be connected to the central compression chamber, the second main exhaust port portion 422 can be connected to the exhaust area 23, and the flow area of ​​the second main exhaust port portion 422 is larger than the flow area of ​​the first main exhaust port portion 420. That is, a sink with a larger radial dimension can be provided on the upper surface of the fixed scroll end plate. In the compressor according to the present disclosure, a second main exhaust port portion is provided between the first main exhaust port portion 420 and the valve assembly 100, so that interference of the connecting portion 123 with the fluid discharge can be avoided, effectively ensuring that the fluid can be discharged from the main exhaust port to the exhaust area.

[0054] In the exemplary compression mechanism according to the present disclosure, the valve plate 130 of the valve assembly 100 is fixed to the central part of the valve body 120. In this way, on the one hand, only a single fixing member can be used to fix multiple valve plates, thereby saving installation space; on the other hand, the fixed end of the valve plate is fixed to the center of the valve body / inner annular wall 43, which, compared with the valve plate arranged on the outer periphery of the radial inner space of the inner annular wall 43, can be provided with a greater number of sub-valve plates to achieve control of multiple groups of auxiliary exhaust ports, thereby increasing the flow area of ​​the auxiliary exhaust ports. In addition, the compressor according to the exemplary embodiment of the present disclosure has a simple structure and requires fewer parts, which can reduce processing costs and parts costs. In addition, the compressor according to the exemplary embodiment of the present disclosure has high compatibility, can be applied to most scrolls, and only requires a simple machining process to achieve a variable volume ratio function.

[0055] Next, we will refer to Figure 7-8 A valve assembly 100A of a compressor according to a second embodiment of the present disclosure will be described in detail. The valve assembly 100A has substantially the same structure as the valve assembly 100 according to the first embodiment, and only the differences will be described below.

[0056] like Figure 7 As shown, the valve assembly 100A may include a valve plate 160. The valve plate 160 may be disposed below the valve plate 130, that is, between the valve plate 130 and the fixed scroll end plate 44. Figure 8 , the valve plate 160 may include an anti-impact portion 162 corresponding to the shape of the valve plate 130. An orifice 164 may be formed at the center of the anti-impact portion 162. The fastener 140 may extend through the orifice 164, the first fastening hole 137 of the valve plate and extend into the second fastening hole 127 of the valve body 120 to fasten the valve plate 160, the valve body and the valve plate into one. The valve plate 160 may also include an auxiliary exhaust passage 166, a main exhaust passage 168 and a pin hole 169. The auxiliary exhaust passage 166 may be in fluid communication with the auxiliary exhaust ports 64, 66 and the main exhaust passage 168 may be in fluid communication with the main exhaust port 42 so that the fluid can flow through the valve plate 160. The positioning pin 150 may extend through the pin hole 129 of the valve body 120 and the pin hole 169 of the valve plate 160 and extend to the pin holes 47, 48 of the fixed scroll, thereby preventing the valve body 120 and the valve plate 160 from circumferential displacement.

[0057] In the valve assembly 100A according to the second embodiment of the present disclosure, the valve disc 120 is protected by the impact protection portion 162 of the valve plate 160, thereby preventing the valve disc 130 from being directly impacted by the fluid discharged from the main exhaust port 42 and reducing the fatigue risk of the valve disc.

[0058] Fig. 9A valve assembly 100B of a compressor according to a third embodiment of the present disclosure is shown. The valve assembly 100B is substantially identical in structure to the valve assembly 100A according to the second embodiment, and only the differences will be described below. An orifice 164B may be formed at the center of the impact-proof portion of the valve plate 160B. The fastener 140 may be disposed in the orifice 164B and extend through the first fastening hole 137 of the valve sheet to extend into the second fastening hole 127 of the valve body 120 to fasten the valve body and the valve sheet into one piece.

[0059] According to the second and third exemplary compression mechanisms of the present disclosure, a compression mechanism with a variable volume ratio function having a small installation space, a large flow area and a simple structure is provided. In addition, according to the second and third exemplary compression mechanisms of the present disclosure, it is possible to avoid reducing the fatigue risk of the valve plate and extend the service life of the valve assembly. In addition, it should be noted that in the second and third exemplary embodiments, the setting of the sink (a first main exhaust port portion with a larger radial dimension is provided on the upper surface of the fixed vortex end plate) is more advantageous because it can also avoid the interference of the anti-impact portion of the valve plate on the fluid discharge, effectively ensuring that the fluid can be smoothly discharged from the main exhaust port to the exhaust area.

[0060] Fig.10 FIG. 2 schematically shows an alternative arrangement of a secondary exhaust port of a compressor according to an exemplary embodiment of the present disclosure. Fig.10 , the part of the secondary exhaust port 64 (here, only one of the secondary exhaust ports 64 and 66 is schematically shown) disposed on the fixed scroll end plate 44 may include a first axial section 610, a second axial section 630, and a transverse connecting section 620. The first axial section 610 extends in the axial direction of the compressor and is connected to the intermediate compression chamber. The second axial section 630 extends in the axial direction to the surface of the fixed scroll end plate 44 facing the valve assembly 100. The transverse connecting section 620 may extend in a transverse direction perpendicular to the axial direction of the compressor and connect the first axial section 610 and the second axial section 630. The transverse connecting section 620 may have an outer end portion that passes through the fixed scroll end plate 44, and the intersection of the transverse connecting section 620 and the second axial section 630 is P, and the transverse connecting section 620 is provided with a plug 640 on the radial outer side of the intersection P to prevent the working fluid from leaking from the exhaust passage. With this arrangement of the secondary exhaust port, the intermediate compression chamber with a lower pressure away from the outer side of the inner annular wall 43 can also be exhausted in advance. Of course, other arrangements of the secondary exhaust port may also be adopted, for example, the secondary exhaust port may only include the first axial section and the second axial section and omit the transverse connecting section. Specifically, the first axial section extends in the axial direction of the compression mechanism and is connected to the intermediate compression chamber, the second axial section extends in the axial direction to the surface of the second scroll end plate facing the valve assembly, the first axial section is directly connected to the second axial section and partially overlaps in the radial direction.

[0061] Although various embodiments and variations of the present disclosure have been described in detail above, it should be understood by those skilled in the art that the present disclosure is not limited to the above-mentioned specific embodiments and variations but may include various other possible combinations and combinations. For example, although an exemplary embodiment in which a fixed vortex is formed with an exhaust port is shown in the view, it is conceivable that an exhaust port may also be formed in the movable vortex. In this case, the fixed vortex is also referred to as the first vortex, and the movable vortex is also referred to as the second vortex, and accordingly, the fixed vortex end plate and the fixed vortex are also referred to as the first vortex end plate and the first vortex, and the movable vortex end plate and the movable vortex are also referred to as the second vortex end plate and the second vortex. Other variations and variants may be realized by those skilled in the art without departing from the essence and scope of the present disclosure. All of these variations and variants fall within the scope of the present disclosure. Moreover, all components described herein may be replaced by other technically equivalent components.

Claims

1. A compression mechanism, comprising: A first scroll (50), the first scroll comprising a first scroll end plate (54) and a first scroll wrap (56) formed on one side of the first scroll end plate; a second scroll (40), the second scroll comprising a second scroll end plate (44) and a second scroll wrap (46) formed on one side of the second scroll end plate, an exhaust port (42, 64, 66) being formed in the second scroll end plate, the second scroll and the first scroll cooperating to form a series of compression chambers therebetween; as well as A valve assembly (100, 100A, 100B), characterized in that the valve assembly comprises: a valve plate (130), the valve plate being arranged above the exhaust port (64, 66) and being capable of selectively opening or closing the exhaust port, and A valve body (120) is configured to limit the displacement range of the valve sheet and at least one valve sheet (130) is fixed to the valve body at a central portion of the valve body (120).

2. The compression mechanism according to claim 1, characterized in that: At least one of the valve plates (130) includes a plurality of sub-valve plates (132), each of the plurality of sub-valve plates (132) including a fixed end (134) fixed to the central portion and a movable end (136) extending from the fixed end in a direction toward the periphery of the valve body.

3. The compression mechanism according to claim 2, characterized in that: A fixing end of at least one of the sub-valve plates may be individually fixed to the central portion.

4. The compression mechanism according to claim 2, characterized in that: The fixed ends of the plurality of sub-valve plates (132) are integrally merged together to form a merge portion (138).

5. The compression mechanism according to claim 4, characterized in that: The plurality of sub-valve plates are symmetrically arranged with the confluence portion (138) as the center.

6. The compression mechanism according to claim 2, characterized in that: The valve body (120) includes an annular main body (122), which is formed with alternately arranged positioning parts (124) and limiting parts (126), the thickness of the limiting part (126) is smaller than the thickness of the positioning part, and the limiting part is configured to limit the displacement range of the movable end (136) of the sub-valve plate.

7. The compression mechanism according to claim 4, characterized in that: The valve body (120) further comprises a connecting portion (123) extending through a central portion of the valve body and connected to an annular body of the valve body (120), wherein an exhaust passage (125) is formed between the connecting portion and the annular body. The connection portion (123) is formed with a protrusion (128) on a side facing the valve plate, and the protrusion is configured to surround the outer periphery of the confluence portion (138) of the valve plate to prevent the valve plate from rotating.

8. The compression mechanism according to claim 4, characterized in that: The valve assembly further includes a fastener (140), a first fastening hole (137) is formed at a confluence portion (138) of the valve plate, a second fastening hole (127) is formed at a central portion of the valve body, and the fastener extends through the first fastening hole (137) and the second fastening hole (127) to fasten the valve plate to the valve body.

9. The compression mechanism according to claim 8, characterized in that: The valve assembly (100A, 100B) further comprises a valve plate (160), wherein the valve plate (160) is arranged between the valve sheet (130) and the second scroll end plate (44), and the valve plate comprises an anti-impact portion (162) corresponding to the shape of the valve sheet.

10. The compression mechanism according to claim 9, characterized in that: The center of the impact-proof portion is formed with an aperture (164, 164B), The orifice (164) is a stepped orifice, and the fastener (140) extends through the stepped orifice (164) to fasten the valve plate, the valve body and the valve disc together, or the orifice (164B) is a straight orifice, and the head of the fastener is arranged in the straight orifice (164B), so that the fastener only fastens the valve body and the valve disc together.

11. The compression mechanism according to claim 1, characterized in that: The valve assembly further comprises a positioning pin (150) extending through a pin hole (129) of the valve body and extending into pin holes (47, 48) of the fixed scroll end plate (44) to prevent the valve body from circumferential displacement.

12. The compression mechanism according to claim 1, characterized in that: The valve assembly (100) further comprises a positioning member (110), wherein the positioning member (110) is fixed to the second scroll (40) and is configured to abut against the valve body (120) so as to fix the axial positions of the valve plate and the valve body.

13. The compression mechanism according to claim 12, characterized in that: The positioning member is formed by a spring (110A), and the spring abuts against the valve body (120) to apply elastic force to the valve body and the valve plate, thereby fixing the axial positions of the valve body and the valve plate.

14. The compression mechanism according to any one of claims 1 to 13, characterized in that: The exhaust port includes a main exhaust port (42) and a secondary exhaust port (64, 66), the main exhaust port is fluidly connected to a central compression chamber in the series of compression chambers, and the secondary exhaust port is fluidly connected to an intermediate compression chamber in the series of compression chambers located radially outside the central compression chamber, and the valve plate (130) selectively opens or closes the secondary exhaust port (64, 66).

15. The compression mechanism according to claim 14, characterized in that: The second scroll end plate (44) is provided with an annular wall (43) on the side opposite to the fixed scroll (46), the main exhaust port and the auxiliary exhaust port are formed in an exhaust area defined by the annular wall, and the valve assembly (100) is centrally arranged on the radial inner side of the annular wall.

16. The compression mechanism according to claim 15, characterized in that: The main exhaust port (42) includes a first main exhaust port part (420) and a second main exhaust port part (422) which are connected to each other, wherein the first main exhaust port part is connected to the central compression chamber, and the second main exhaust port part is connected to the exhaust area, and the flow area of ​​the second main exhaust port part is greater than the flow area of ​​the first main exhaust port part.

17. The compression mechanism according to claim 14, characterized in that: The secondary exhaust port (64) includes a first axial section (610), a second axial section (630), and a transverse connecting section (620), wherein the first axial section (610) extends along the axial direction of the compression mechanism and is connected to the intermediate compression chamber, the second axial section (630) extends along the axial direction to the surface of the second scroll end plate (44) facing the valve assembly (100), and the transverse connecting section (620) extends along the transverse direction perpendicular to the axial direction of the compression mechanism and connects the first axial section and the second axial section.

18. The compression mechanism according to claim 14, characterized in that The secondary exhaust port (64) includes a first axial section (610) and a second axial section (630), wherein the first axial section (610) extends in the axial direction of the compression mechanism and is connected to the intermediate compression chamber, and the second axial section (630) extends in the axial direction to the surface of the second scroll end plate (44) facing the valve assembly (100), and the first axial section is directly connected to the second axial section and partially overlaps in the radial direction.

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