Pre-compression structure and scroll compressor

Abstract

The application discloses a pre-compression structure and a scroll compressor. The pre-compression structure comprises a support, a roller and an elastic sealing part. The support has an inner cavity, and a suction port and an exhaust port are arranged on the side wall of the support and penetrate to the inner cavity. The roller is rotatably arranged in the support. The elastic sealing part is arranged between the side wall of the roller and the inner cavity and elastically surrounds the side wall of the roller and the inner cavity to form a cavity. The volume of the cavity changes with the rotation of the roller and is sequentially communicated with the suction port and the exhaust port. Through the application, the rotation of the roller realizes the process of gas suction, compression and exhaust. The inhaled refrigerant is preliminarily compressed and then sent to the pump body to work, so that the suction density is increased and the refrigerating capacity is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor, in particular to a pre-compression structure and scroll compressor. BACKGROUND

[0002] The scroll compressor is a kind of volumetric compressor with high efficiency, low noise and stable operation, which is widely used in air conditioners and refrigeration units in recent years. The working principle of the scroll compressor is that, in the process of suction, compression and exhaust, the static scroll disc is fixed on the support in the scroll compressor shell, the dynamic scroll disc is directly supported on the support, the crankshaft is driven by the motor, and the rotation around the center of the base circle of the static scroll disc is restricted by the automatic mechanism, and the volume of the gas compression chamber formed by the joint of the static scroll disc and the dynamic scroll disc is gradually reduced, so as to achieve the purpose of compressing gas.

[0003] At present, in order to improve the cooling capacity of the compressor without increasing the size of the compressor, the enthalpy increasing structure is generally used, but the enthalpy increasing structure needs to increase the pipeline and flasher and other equipment in the system, the control is more complex, the compressor increases more sealing parts, the operation is not convenient, and the reliability is affected. SUMMARY

[0004] The embodiment of the present application provides a pre-compression structure and scroll compressor, which aims to solve the problem of low refrigeration capacity of the existing compressor.

[0005] The present application provides a pre-compression structure, comprising: a support, a roller and an elastic sealing part, the support has an inner cavity, the side wall of the support is provided with suction port and exhaust port penetrating to the inner cavity along the circumference thereof; the roller is rotatably arranged in the support; the elastic sealing part is elastically arranged between the side wall of the roller and the inner cavity to form a cavity with the side wall of the roller and the inner cavity; wherein the volume of the cavity changes with the rotation of the roller and is sequentially communicated with the suction port and the exhaust port.

[0006] In the pre-compression structure provided by the present application, the inner cavity is elliptical, and the outer diameter of the roller is tangent to the minor axis of the inner cavity.

[0007] In the pre-compression structure provided by the present application, the side wall of the roller is provided with a plurality of installation grooves along the circumference thereof, the elastic sealing part is arranged in each installation groove, the elastic sealing part abuts against the inner cavity and can extend or retract into the installation groove under the action of elastic force; wherein the two adjacent elastic sealing parts and the side wall of the roller and the inner cavity form a cavity.

[0008] In the pre-compression structure, the elastic sealing part comprises an elastic member and a vane, the elastic member is arranged at one end of the mounting groove away from the slot, one end of the vane compresses the elastic member, and the other end abuts against the inner cavity and can extend or retract out of the slot under the elastic force.

[0009] In the pre-compression structure, the mounting groove is opened by the side wall of the roller towards the axis of the roller and deviating from the radial straight line.

[0010] In the pre-compression structure, the air inlet and the air outlet are both provided with two and symmetrically arranged along the center of the support; the vane is provided with five, and each adjacent two vanes define a cavity, wherein one cavity is divided into two cavities by the tangent position of the roller and the inner cavity, so that the five vanes define six cavities; wherein, two symmetric cavities communicated with the two air outlets are exhaust cavities, two symmetric cavities communicated with the two air inlets are air inlet cavities, and the remaining two symmetric cavities are compression cavities.

[0011] In the pre-compression structure, the support comprises a sealing cover and a shell, the inner cavity is arranged in the shell, the air inlet is arranged on the side wall of the shell and penetrates to the inner cavity, and the sealing cover covers the inner cavity; wherein, the air outlet is arranged on the sealing cover to communicate with the back pressure cavity; or the air outlet is arranged on the shell to be independent of the back pressure cavity.

[0012] In the pre-compression structure, the sealing cover comprises a barrel part and a frame part arranged on the outer periphery of the barrel part, the bottom of the barrel part covers the upper side of the roller, and the air outlet radially penetrates the side wall of the bottom of the barrel part; the frame part is flush with the end face of the shell, the end face of the shell is provided with a first exhaust groove, the frame part is provided with a second exhaust groove, and the first exhaust groove is connected with the second exhaust groove.

[0013] In the pre-compression structure, the end face of the shell is provided with a first exhaust groove, the air outlet comprises a third exhaust groove and an inclined hole, the third exhaust groove is opened by the side wall of the inner cavity radially outward, and the inclined hole is opened in the side wall of the inner cavity, and the two ends of the inclined hole are connected with the third exhaust groove and the first exhaust groove, respectively.

[0014] The application further provides a scroll compressor comprising the above pre-compression structure.

[0015] The application provides a pre-compression structure and a scroll compressor. The pre-compression structure comprises a bracket, a roller and an elastic sealing part. The elastic sealing part is elastically arranged between the side wall of the roller and the inner cavity of the bracket. The elastic sealing part, the side wall of the roller and the inner cavity of the bracket form a cavity. The cavity is in communication with the suction port and the exhaust port of the bracket in turn with the rotation of the roller. The volume of the cavity changes in the process of the rotation of the roller. Thus, the cavity sucks air when it is in communication with the suction port, compresses air due to the change of the volume when it is not in communication with the suction port or the exhaust port, and exhausts air when it is in communication with the exhaust port. The process of sucking, compressing and exhausting air is realized. The sucked refrigerant is preliminarily compressed and then sent into the pump body to work, so that the suction density is increased and the refrigerating capacity is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is an explosion schematic view of the pre-compression structure of the embodiment of the present application.

[0018] Figure 2 It is a cross-sectional schematic view of the pre-compression structure of the embodiment of the present application.

[0019] Figure 3 It is a longitudinal cross-sectional schematic view of the pre-compression structure of the embodiment of the present application.

[0020] Figure 4 It is a longitudinal cross-sectional schematic view of the pre-compression structure of another embodiment of the present application.

[0021] Figure 5 It is an enlarged view of A part of the pre-compression structure. Figure 4

[0022] Figure 6 It is a longitudinal cross-sectional schematic view of the pre-compression structure of another embodiment of the present application.

[0023] Figure 7 It is a cross-sectional schematic view of the scroll compressor of the embodiment of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] ​10, support; 11, housing; 12, sealing cover; 121, cylinder portion; 122, frame portion; 13, bearing; 14, bottom plate; 15, sealing member; 16, wear plate; 101, air inlet; 102, air outlet; 103a, first air outlet groove; 103b, second air outlet groove; 103c, third air outlet groove; 103d, inclined hole; 20, roller; 21, mounting groove; 30, elastic sealing portion; 31, elastic member; 32, vane; 301, air suction cavity; 302, compression cavity; 303, air outlet cavity; 100, pre-compression structure; 200, moving disc; 210, back pressure cavity; 220, back pressure hole; 300, stationary disc; 310, stationary disc air inlet. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0027] The direction terms mentioned in the present application, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", and the like, are only the directions of the attached drawings. Therefore, the direction terms used are used to illustrate and understand the present application, rather than to limit the present application. In addition, in the drawings, structures similar or identical to each other are denoted by the same reference numerals.

[0028] Please refer to Figures 1-7 , Figure 1 An explosion schematic view of a pre-compression structure 100 according to an embodiment of the present application is shown in the figure. The pre-compression structure 100 comprises a support 10, a roller 20 and an elastic sealing portion 30. The support 10 has an inner cavity. An air inlet 101 and an air outlet 102 are provided on the side wall of the support 10 and extend to the inner cavity. The roller 20 is rotatably arranged in the support 10. The elastic sealing portion 30 is elastically arranged between the side wall of the roller 20 and the inner cavity to form a cavity with the side wall of the roller 20 and the inner cavity. The volume of the cavity changes with the rotation of the roller 20 and is in communication with the air inlet 101 and the air outlet 102 in turn.

[0029] It should be noted that there are various ways to change the volume of the cavity in the embodiment, for example, the shape of the roller 20 or the bracket 10 can be changed, so that the outer peripheral wall of the roller 20 is irregular, such as triangular, polygonal, etc., or the inner peripheral wall of the inner cavity is irregular, such as triangular, polygonal, etc. As long as one of them is irregular, the other can also be irregular. The elastic sealing part 30 can also be set as an air bag body with deformation ability, and the volume of the air bag body will change with the inhalation and exhalation of the gas. The specific form can be set according to the actual demand, which is not limited here.

[0030] Specifically, the bracket 10 includes a shell 11 and a sealing cover 12, the inner cavity is arranged in the shell 11, the shell 11 is in the shape of an inverted cylinder as a whole, the bottom center of the shell 11 is provided with an axle hole for the crankshaft to pass through, the top of the shell 11 is open, and a step is further arranged on the inner wall of the shell 11, the inner cavity below the step, the roller 20 is placed in the inner cavity, the inner diameter of the inner cavity is slightly larger than the outer diameter of the roller 20, and the roller 20 is installed in interference with the crankshaft, so that it can rotate with the crankshaft. The air inlet 101 is arranged on the side wall of the shell 11 and penetrates to the inner cavity. The shell 11 is further provided with a bearing 13 and a bottom plate 14, the bearing 13 is arranged below the roller 20, and the bottom plate 14 is arranged between the roller 20 and the bearing 13. The bottom plate 14 is used to isolate the bearing 13 and also plays a sealing bottom role. The sealing cover 12 is pressed into interference fit with the shell 11. Specifically, the sealing cover 12 includes a barrel part 121 and a frame part 122 arranged on the outer periphery of the barrel part 121. The barrel part 121 is in the shape of a cylinder, and the frame part 122 is also in the shape of a circular frame. The outer diameter of the frame part 122 is larger than the outer diameter of the barrel part 121. The frame part 122 is placed on the step and supported by the step. The end face of the frame part 122 is flush with the end face of the shell 11. The barrel part 121 is placed into the inner cavity, and the bottom of the barrel part 121 seals the upper part of the roller 20. Through the size guarantee, the roller 20 can rotate smoothly and not leak.

[0031] Through the implementation of the embodiment, the cavity is sequentially communicated with the air inlet 101 and the air outlet 102 of the bracket 10 with the rotation of the roller 20, and the volume of the cavity changes in the process of the rotation of the roller 20. Therefore, the cavity inhales air when it is communicated with the air inlet 101, compresses the gas due to the change of the volume when it is not communicated with the air inlet 101 or the air outlet 102, and exhausts the gas when it is communicated with the air outlet 102, thereby realizing the process of inhaling, compressing and exhausting the gas. The inhaled refrigerant is preliminarily compressed and then sent into the pump body to work, thereby increasing the suction density and improving the refrigerating capacity.

[0032] Reference Figure 2In an embodiment, for example, the embodiment, the embodiment proposes a better way to change the volume of the cavity. In the embodiment, the inner cavity is elliptical, and the roller 20 is circular. The outer diameter of the circular roller 20 is tangent to the minor axis of the elliptical inner cavity. Specifically, the diameter of the roller 20 coincides with the minor axis of the elliptical inner cavity, so that the side wall of the roller 20 is tangent to the narrowest part of the elliptical inner cavity. Then, the cavity enclosed by the elastic sealing part 30, the side wall of the roller 20 and the inner cavity has a relatively small volume at the narrowest part of the elliptical inner cavity and a relatively large volume at the widest part of the elliptical inner cavity, that is, the cavity can change its volume with the distance between the elliptical inner cavity and the side wall of the roller 20, and when the volume of the cavity changes, the gas in the cavity 302 will be compressed, and finally the cavity realizes the process of inhaling, compressing and exhausting the gas.

[0033] Continuing to refer to Figure 1 In a specific implementation, the side wall of the roller 20 is provided with a plurality of installation grooves 21 spaced apart along the circumference thereof, and the elastic sealing part 30 is arranged in each installation groove 21. The elastic sealing part 30 can extend out of the installation groove 21 to abut against the inner cavity or retract into the installation groove 21 under the action of the elastic force. Specifically, the roller 20 is circular, and an axle hole is formed in the center of the roller 20 and is fitted with the crankshaft in an interference fit. One end of the installation groove 21 extends towards the center, and the one end of the installation groove 21 penetrates to the outer side wall of the roller 20, and the slot of the installation groove 21 is formed in the outer side wall of the roller 20. In this way, the elastic sealing part 30 can be accommodated in the installation groove 21, and the elastic sealing part 30 also abuts against the inner cavity. Since the elastic sealing part 30 has elasticity, with the rotation of the roller 20, the narrow part of the elliptical inner cavity can press the elastic sealing part 30 back into the installation groove 21, and the wide part of the elliptical inner cavity can extend the elastic sealing part 30 out of the slot to abut against the elliptical inner cavity. Then, a plurality of installation grooves 21 are arranged spaced apart along the circumference of the roller 20, and the elastic sealing part 30 is arranged in each installation groove 21, so that there are a plurality of elastic sealing parts 30, the number of the elastic sealing parts 30 matches the number of the installation grooves 21, and the number of the elastic sealing parts 30 and the installation grooves 21 can be five or other numbers, which are not limited herein. The two adjacent elastic sealing parts 30 extend out of the slot to abut against the inner cavity, so that the two adjacent elastic sealing parts 30 and the side wall of the roller 20 and the inner cavity can jointly enclose a cavity, and a plurality of elastic sealing parts 30 can enclose a plurality of cavities. The embodiment uses the installation groove 21 to accommodate the elastic sealing part 30, and the structure of enclosing a cavity by two elastic sealing parts 30 is simple.

[0034] Referring to Figure 1 and Figure 2Further, the elastic sealing part 30 comprises an elastic member 31 and a vane 32, the elastic member 31 is arranged at one end of the mounting groove 21 away from the slot, one end of the vane 32 compresses the elastic member 31, and the other end abuts against the inner cavity and can extend or retract the slot under the action of elastic force. Specifically, the length of the vane 32 is substantially the same as the length of the mounting groove 21, the height of the vane 32 is the same as the height of the roller 20, and the vane 32 can be completely accommodated in the mounting groove 21. The elastic member 31 can be a spring, and it is understood that it can also be other elastic components. The mounting groove 21 comprises opposite first and second groove walls, and arc-shaped grooves are formed on the first and second groove walls, and the arc-shaped grooves on the first and second groove walls together form a circular groove for placing the spring. During assembly, the spring is first inserted between the two arc-shaped grooves, and then the vane 32 is placed into the mounting groove 21 along the slot to compress the spring, which is simple in structure and convenient to assemble.

[0035] Further, the mounting groove 21 is formed by extending away from the radial straight line of the side wall of the roller 20 towards the axis of the roller 20. Specifically, the mounting groove 21 is a straight groove, but the mounting groove 21 is not arranged along the radial direction of the roller 20, but is arranged at an angle away from the radial direction. The mounting groove 21 arranged at an angle away from the radial direction can make it easier for the vane 32 to abut against the inner cavity when the roller 20 rotates, and will not exert excessive resistance on the rotation of the roller 20. Moreover, the end surface of the vane 32 abutting against the inner cavity can be designed as a tangent surface, which further reduces the resistance of the vane 32 to the rotation of the roller 20 by being tangent to the inner cavity.

[0036] Referring to Figure 2 The air inlet 101 and the air outlet 102 are both provided with two and are symmetrically arranged along the center of the bracket 10; the vane 32 is provided with five, and each adjacent two vanes 32 define a cavity, wherein one of the cavities is divided into two by the tangent position of the roller 20 and the inner cavity, so that the five vanes 32 define six cavities; wherein two symmetric cavities communicated with the two air outlets 102 are exhaust cavities 303, two symmetric cavities communicated with the two air inlets 101 are air inlet cavities 301, and the remaining two symmetric cavities are compression cavities 302. Specifically, the two air inlets 101 are symmetrically arranged on the side wall of the shell 11, and the two air outlets 102 are symmetrically arranged on the bottom of the cylindrical part 121 of the sealing cover 12. The roller 20 is provided with five mounting grooves 21 for placing five springs and five vanes 32. When the spring is placed in the mounting groove 21, it is always in a compressed state, so the spring will always push the vane 32, so that the vane 32 is always in contact with the elliptical inner cavity. When the vane 32 rotates with the roller 20, the vane 32 gradually approaching the narrowest part of the ellipse will slowly retract into the mounting groove 21, and the vane 32 far away from the narrowest part of the ellipse will slowly extend out of the mounting groove 21, and so on.Figure 2 Wherein one piece of leaf 32 is retracted in the installation slot 21 at the narrowest place of one side of the oval inner cavity, and two pieces of leaf 32 abut on both sides of the narrowest place of the other side of the oval inner cavity, and the cavity defined between the two pieces is divided into two cavities by the narrowest place, so that the five leaves 32 and the side wall of the roller 20, the oval inner cavity form six cavities, respectively 2 suction cavities 301, 2 compression cavities 302, 2 exhaust cavities 303, which are symmetrically arranged two by two along the center, that is, the cavity opposite to the suction cavity 301 is also the suction cavity 301, the cavity opposite to the compression cavity 302 is also the compression cavity 302, and the cavity opposite to the exhaust cavity 303 is also the exhaust cavity 303. Through the symmetric cavity structure of the embodiment, the symmetric suction and exhaust is continuous during the rotation of the roller 20, and the two suction cavities 301 are distributed on different sides of the roller 20, and the exhaust cavities 303 are also distributed on different sides of the roller 20, so that the pressure balance of the compressed gas can be achieved between them, and the moment change is small; the characteristics of the scroll compressor are similar, so that the primary compressed gas sucked by the pump body is relatively smooth, and the suction fluctuation is not caused, and the reliability of the whole machine is improved.

[0037] Referring to Figure 4 And Figure 5 When the scroll compressor is working, an axial force tending to make the dynamic and static disks 300 move away from each other is generated. Because the static disk 300 is fixed, it is generally considered that the axial force is the force acting on the dynamic disk 200. The axial force will separate the dynamic and static disks 300, and a gap will be generated between the two, so that there will be a leakage problem and the performance will be poor. Therefore, the scroll compressor needs to construct a cavity, called back pressure cavity 210, on the back of the dynamic disk 200, so that the back pressure cavity 210 is at an intermediate pressure between the suction and exhaust pressures. Through the gas in the back pressure cavity 210 acting on the bottom of the dynamic disk 200, the dynamic disk 200 is pushed towards the static disk 300, so as to balance the unbalanced axial force and moment of the dynamic disk 200.

[0038] Referring to Figure 4In order to provide back pressure for the impeller 200, balance axial force, reduce leakage of the pump body, in an embodiment, the bracket 10 comprises a sealing cover 12 and a shell 11, the inner cavity is arranged in the shell 11, the suction port 101 is arranged on the side wall of the shell 11 and penetrates to the inner cavity, and the sealing cover 12 covers the inner cavity; wherein the exhaust port 102 is arranged on the sealing cover 12 to communicate with the back pressure cavity 210. Specifically, the shell 11 of the embodiment further comprises a sealing element 15 and a wear plate 16, the sealing element 15 is arranged along the shaft hole of the sealing cover 12 to seal the gap between the sealing cover 12 and the crankshaft. The impeller 200 is supported on the end surface of the shell 11 and the sealing cover 12, and the wear plate 16 is arranged between the end surface of the shell 11 and the sealing cover 12 and the impeller 200. The sealing element 15, the sealing cover 12, the wear plate 16 and the impeller 200 jointly constitute the back pressure cavity 210. Wherein, since the exhaust port 102 is arranged on the sealing cover 12, the exhaust port 102 is communicated with the back pressure cavity 210, and the gas can enter the back pressure cavity 210 through the exhaust port 102 to provide back pressure. Through the embodiment, by using a pre-compression structure 100 with a suitable size, the back pressure can be balanced with the axial force generated by the pump body, the friction power consumption is reduced, the axial leakage is reduced, and the reliability is improved.

[0039] With reference to the foregoing Figure 4In a specific implementation, the sealing cover 12 includes a barrel portion 121 and a frame portion 122 arranged on the outer periphery of the barrel portion 121. The bottom of the barrel portion 121 is closed on the upper side of the roller 20, and the exhaust port 102 penetrates the side wall of the bottom of the barrel portion 121 in the radial direction. The frame portion 122 is flush with the end surface of the housing 11. The end surface of the housing 11 is provided with a first exhaust groove 103a, and the frame portion 122 is provided with a second exhaust groove 103b. The first exhaust groove 103a is connected to the second exhaust groove 103b. Specifically, the exhaust port 102 is provided with two exhaust ports 102, which are symmetrically arranged on the bottom of the barrel portion 121. The exhaust port 102 penetrates from the outer wall to the inner wall of the barrel portion 121. In this way, the inside of the barrel portion 121 can be accessed through the two exhaust ports 102, and then accessed into the back pressure chamber 210. The first exhaust groove 103a and the second exhaust groove 103b are arranged on the end surface of the frame portion 122 and the housing 11. The first exhaust groove 103a and the second exhaust groove 103b penetrate the outer wall of the housing 11 in a straight line, and the first exhaust groove 103a and the second exhaust groove 103b form a first exhaust passage. The static disc 300 is fixed on the end surface of the housing 11. The static disc 300 is also provided with a static disc suction port 310, which is arranged above the first exhaust groove 103a and communicates with the first exhaust groove 103a. In this way, while providing back pressure, the gas enters the static disc suction port 310 through the first exhaust passage, and the suction action of the compressor is completed. Since the rotary vane structure has two symmetric suction, compression, and exhaust chambers 303, there is always a suction, compression, and exhaust state during operation, and the exhaust is relatively smooth, which has a high matching degree with the scroll compressor. Through this embodiment, the refrigerant is first pre-compressed, then enters the back pressure chamber 210 through the change in volume, and then is sucked into the pump body to work, which can effectively improve the suction efficiency of the compressor and improve the performance. At the same time, by designing the pre-compression volume to achieve the ideal gas force, the dynamic disc 200 can provide back pressure and balance the axial force, and reduce the leakage of the pump body.

[0040] With reference to Figure 6 In another embodiment, the exhaust port 102 is arranged on the housing 11 to be independent of the back pressure chamber 210. The exhaust passage of this embodiment can directly pass into the suction port 101 of the pump body without being discharged into the back pressure chamber 210, so that the compressor can use the original back pressure passage, and the pre-compression and back pressure do not interfere with each other, so that each part can fully play its own function without worrying about other influences, thereby improving the reliability.

[0041] With reference to Figure 6In specific embodiments, the end surface of the shell 11 is provided with a first exhaust groove 103a, the exhaust port 102 includes a third exhaust groove 103c and an inclined hole 103d, the third exhaust groove 103c is radially outwardly opened by the side wall of the inner cavity, the inclined hole 103d is opened in the side wall of the inner cavity, and the two ends of the inclined hole 103d are connected with the third exhaust groove 103c and the first exhaust groove 103a respectively. Specifically, in order not to communicate with the back pressure cavity 210, the exhaust port 102 of the present embodiment is arranged on the shell 11, and the exhaust port 102 includes two parts, namely the third exhaust groove 103c and the inclined hole 103d, the third exhaust groove 103c is in the same horizontal plane as the roller 20, and the third exhaust groove 103c is radially outwardly opened by the inner cavity but does not penetrate the side wall of the shell 11. The inclined hole 103d is arranged in the side wall of the shell 11, and from the cross section of the shell 11, one end of the inclined hole 103d is connected with the third exhaust groove 103c, and the other end of the inclined hole 103d is connected with the first exhaust groove 103a on the end surface of the shell 11, that is, the third exhaust groove 103c and the first exhaust groove 103a are connected through the inclined hole 103d. In this way, the third exhaust groove 103c, the inclined hole 103d and the first exhaust groove 103a jointly form a second exhaust passage. With the rotation of the roller 20, the cavity communicates with the third exhaust groove 103c, and the gas in the cavity is directly discharged into the suction port 101 of the pump body along the second exhaust passage, without being discharged into the back pressure cavity 210, so that the compressor can use the original back pressure channel, and the pre-compression and back pressure do not interfere with each other.

[0042] In other embodiments, a valve piece structure can also be added in the exhaust passage, and the size of the back pressure can be controlled by adjusting the elastic force of the valve piece, so that the compressor is more reliable.

[0043] Reference Figure 7 The embodiment of the present application also provides a scroll compressor comprising the pre-compression mechanism of the above embodiment.

[0044] Through the scroll compressor of the present embodiment, by adding the pre-compression structure 100, the pre-compression structure 100 forms six pairs of closed cavities by the roller 20 and the blade 32, and the refrigerant is preliminarily compressed and then works in the pump body, so as to achieve the effect of two-stage compression. The pre-compression structure 100 is well matched with the scroll compressor, can gently provide the compressed refrigerant, and improves the reliability. The pre-compression structure 100 can also provide back pressure for the pump body, so as to achieve the purpose of reducing the leakage of the pump body.

[0045] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A scroll compressor, characterized in that, include: The moving disk, the stationary disk, and the pre-compression structure, wherein the pre-compression structure includes: A support includes a sealing cover, a housing, and an inner cavity. The inner cavity is located within the housing. The sidewalls of the support are circumferentially spaced with air intake and exhaust ports that extend into the inner cavity. The air intake ports are located on the sidewalls of the housing and extend into the inner cavity. The sealing cover closes the inner cavity. The housing also contains a sealing element and a wear-resistant plate. The sealing element is disposed along the axial hole of the sealing cover. A movable disc is supported on the end faces of the housing and the sealing cover. The wear-resistant plate is located between the end faces of the housing and the sealing cover and the movable disc. The sealing element, the sealing cover, the wear-resistant plate, and the movable disc together form a back pressure chamber. The exhaust port is located on the sealing cover to communicate with the back pressure chamber. Rollers are rotatably disposed within the bracket; An elastic sealing part is elastically disposed between the side wall of the roller and the inner cavity, so as to form a cavity by enclosing the side wall of the roller and the inner cavity; The cavity is configured such that its volume changes as the roller rotates and is sequentially connected to the air intake and the air exhaust. The sealing cap includes a cylindrical part and a frame part disposed on the outer periphery of the cylindrical part. The bottom of the cylindrical part covers the upper side of the roller. The exhaust port radially penetrates the side wall of the bottom of the cylindrical part to communicate with the back pressure chamber. The frame part is flush with the end face of the housing. The end face of the housing is provided with a first exhaust groove. The frame part is provided with a second exhaust groove. The first exhaust groove is connected to the second exhaust groove. The stationary plate is fixed to the end face of the housing. The stationary plate is also provided with a stationary plate suction port. The stationary plate suction port is located above the first exhaust groove and communicates with it.

2. The scroll compressor of claim 1, wherein The inner cavity is elliptical, the roller is circular, and the outer diameter of the roller is tangent to the minor axis of the inner cavity.

3. The scroll compressor of claim 2, wherein, The roller has multiple mounting grooves spaced apart along its circumference on its sidewall. Each mounting groove is provided with an elastic sealing part. The elastic sealing part abuts against the inner cavity and can extend or retract into the mounting groove under the action of elastic force. Adjacent elastic sealing parts, together with the sidewall of the roller and the inner cavity, form a cavity.

4. The scroll compressor of claim 3, wherein The elastic sealing part includes an elastic element and a blade. The elastic element is located at the end of the mounting groove away from the groove opening. One end of the blade compresses the elastic element, and the other end abuts against the inner cavity and can extend or retract from the groove opening under the action of elastic force.

5. The scroll compressor of claim 4, wherein The mounting groove is formed by extending from the sidewall of the roller toward the axis of the roller and deviating from a radial straight line.

6. The scroll compressor of claim 5, wherein, The air intake and the air exhaust are each provided in twos and are symmetrically arranged along the center of the bracket; there are five blades, and each pair of adjacent blades defines a cavity, wherein one cavity is divided into two cavities by the tangent of the roller and the inner cavity, so that the five blades define six cavities; Among them, the two symmetrical cavities connected to the two exhaust ports are exhaust cavities, the two symmetrical cavities connected to the two intake ports are intake cavities, and the remaining two symmetrical cavities are compression cavities.

7. A scroll compressor characterized by, include: A moving disc and a static disc and a pre-compression structure comprising: A bracket comprising a sealing cover, a shell and an inner cavity, the inner cavity is arranged in the shell, a side wall of the bracket is spaced apart in its circumference direction and provided with an air inlet and an air outlet which penetrate to the inner cavity, the air inlet is arranged on the side wall of the shell and penetrates to the inner cavity, the sealing cover covers the inner cavity, a sealing member and a wear plate are further arranged in the shell, the sealing member is arranged along an axial hole of the sealing cover, the moving disc is supported on the end face of the shell and the sealing cover, the wear plate is arranged between the end face of the shell and the sealing cover and the moving disc, the sealing member, the sealing cover, the wear plate and the moving disc jointly constitute a back pressure cavity, the air outlet is arranged on the shell to be independent of the back pressure cavity; a first air outlet groove is arranged on the end face of the shell, the air outlet comprises a third air outlet groove and an inclined hole, the third air outlet groove is opened radially outwardly from the side wall of the inner cavity, the inclined hole is opened in the side wall of the inner cavity, and the two ends of the inclined hole are connected with the third air outlet groove and the first air outlet groove respectively; A roller is rotatably arranged in the bracket; An elastic sealing part is elastically arranged between the side wall of the roller and the inner cavity to form a cavity together with the side wall of the roller and the inner cavity; The cavity is configured to change its volume with the rotation of the roller and sequentially communicate with the air inlet and the air outlet.

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