An oil-free scroll machine

Abstract

An oil-free scroll machine includes a stator, a moving plate, a crank assembly, a main shaft assembly, and a frame. The moving plate is connected to the main shaft assembly, and multiple crank assemblies are arranged on the periphery of the moving plate. The moving plate performs planar circular motion under the drive of the main shaft assembly and the restriction of the crank assembly. The stator and the moving plate engage with each other to form a working chamber whose volume changes sequentially. The tail of the outermost static scroll tooth is sealed and connected to the inner static scroll tooth through a curved wall. The moving plate includes a moving scroll tooth and a base plate. The outer edge of the base plate is always outside the static scroll tooth and the crank assembly during the operation of the moving plate. The stator and the base plate are provided with stator and moving plate crank mounting holes in the external environment. The two ends of the crank assembly are connected to the stator and moving plate crank mounting holes. The stator is also provided with a frame mounting hole. Assembly space for the main shaft assembly is left between the frame and the moving plate. The present invention increases the stroke volume and space utilization efficiency of the scroll machine and reduces the overall dimensions of the scroll machine.

Description

Technical Field

[0001] The present invention relates to a fluid working medium driving device, in particular to an oil-free vortex machine. Background Art

[0002] A scroll compressor features a spiral scroll body mounted vertically on the orbiting and stationary scroll plates. The orbiting motion of the orbiting scroll plate meshes with the stationary scroll bodies, forming several varying crescent-shaped working chambers. This creates pressure fluctuations within the fluid working medium. In actual operation, the fluid needs to be isolated from the outside world and the gas torque during the compression process must be prevented from causing the orbiting scroll plate to rotate. Existing oil-free scroll assemblies drive the orbiting scroll plate via a main shaft mounted on the frame. The orbiting scroll plate and frame are connected via three small crankshaft assemblies within the housing to prevent rotation.

[0003] Existing oil-free scroll assemblies have the following problems: 1. The volume of the outermost crescent-shaped closed cavity is not fully utilized and the structure is not compact; 2. The errors caused by the assembly of the frame and the stator disk can easily reduce the bearing life of the small crank; 3. When the pressure and temperature inside the scroll machine housing change, the lubricating grease of the small crank bearing can easily flow out due to excessive temperature or vaporize due to excessive pressure. Summary of the Invention

[0004] The purpose of the present invention is to provide an oil-free scroll machine to address the problems in the above-mentioned prior art, thereby increasing the stroke volume and space utilization efficiency of the scroll machine, reducing the external dimensions of the scroll machine at the same power, and protecting the bearing lubricating grease.

[0005] In order to achieve the above object, the present invention has the following technical solutions:

[0006] An oil-free scroll machine includes a stator, a moving plate, a crank assembly, a main shaft assembly and a frame. The moving plate is connected to the main shaft assembly. A plurality of crank assemblies are arranged on the periphery of the moving plate. The moving plate performs planar circular motion under the drive of the main shaft assembly and the restriction of the crank assembly. The stator and the moving plate engage with each other to form a working chamber with a volume that changes sequentially. The stator includes a static scroll tooth, and the static scroll tooth includes a first outer profile and a first inner profile. The outermost tail of the static scroll tooth is closed and connected to the inner static scroll tooth through a curved wall. The moving plate includes The movable scroll gear and the base plate, the movable scroll gear includes a second outer profile line and a second inner profile line, and the outer edge of the base plate is always on the outside of the static scroll gear and the crank assembly during the operation of the movable disc; the static disc and the base plate are exposed to the external environment and are provided with static disc crank mounting holes and movable disc crank mounting holes, and the two ends of the crank assembly are connected to the static disc crank mounting holes and the movable disc crank mounting holes. The static disc is also provided with a frame mounting hole, and the frame is axially connected to the frame mounting hole on the outside of the movable disc through a connecting piece, and an assembly space for the main shaft assembly is left between the frame and the movable disc.

[0007] As a preferred solution, the number of turns of the first inner profile line is greater than that of the first outer profile line; and the number of turns of the second outer profile line is greater than that of the second inner profile line.

[0008] As a preferred solution, the number of turns of the first inner profile line is half a turn more than the number of turns of the first outer profile line; the number of turns of the second outer profile line is half a turn more than the number of turns of the second inner profile line.

[0009] As a preferred solution, the tooth tops of the stationary scroll gear and the movable scroll gear are grooved along their respective tooth profiles, and static sealing strips and dynamic sealing strips are respectively installed in the grooves of the tooth tops of the stationary scroll gear and the movable scroll gear.

[0010] As a preferred solution, a curved section is added to the tail of the static sealing strip, and a groove is opened along the top of the curved wall. The curved section of the tail of the static sealing strip is installed in the groove at the top of the curved wall and connected to the static sealing strip in the groove at the top of the inner static scroll tooth.

[0011] As a preferred solution, the spindle assembly includes an eccentrically arranged first spindle and a second spindle, and a balancing weight arranged at the connection between the first spindle and the second spindle.

[0012] As a preferred solution, the eccentricity of the crank assembly is equal to the eccentricity of the main shaft assembly, and self-lubricating crank rolling bearings are installed at both ends of the crank assembly.

[0013] As a preferred solution, one end of the spindle connected to the moving plate in the spindle assembly is equipped with a self-lubricating first spindle rolling bearing, and the other end of the spindle is equipped with a second spindle rolling bearing, and the second spindle rolling bearing is installed in the mounting hole in the center of the frame.

[0014] As a preferred solution, the oil-free scroll machine further includes a heat dissipation structure for cooling the stator and the bearings.

[0015] As a preferred solution, one end of the main shaft is connected to a motor outside the frame for providing driving force.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] The crank assembly is used to limit the moving disk driven by the main shaft to achieve high-precision planar revolution. The volume of the closed working chamber formed between the moving and static vortex teeth changes with the rotation of the crankshaft, thereby realizing the operation of the working fluid pressure. Since the tail of the static disk is closed and connected to the inner static vortex teeth through a curved wall, a closed chamber isolated from the environment is formed. The outer edge of the bottom plate of the moving disk is always outside the static vortex teeth and the curved wall during the operation of the moving disk to prevent the working chamber from being connected to the external environment and prevent the mass exchange between the working fluid and the environment. The present invention advances the formation time of the outermost crescent-shaped closed chamber of the vortex machine by extending the outer contour line of the moving disk and the inner contour line of the static disk, and the formed area is expanded, thereby increasing the stroke volume and space utilization efficiency of the vortex machine and reducing the external dimensions of the vortex machine at the same power.

[0018] Furthermore, during operation, the scroll machine of the present invention exposes the rolling bearings of the main shaft assembly and crank assembly to the external environment, ensuring stable pressure and protecting the bearing lubricant. Furthermore, the eccentric shafts of the main shaft assembly and crank assembly stir the ambient air during operation, enhancing convective heat transfer between the air and the bearings and improving bearing cooling. Furthermore, since the bearings are directly exposed to the external environment, they can be cooled using simpler forced air or water cooling mechanisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 1 is a schematic structural diagram of an oil-free scroll machine provided by one embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the static disk structure provided by an embodiment of the present invention;

[0022] Figure 3 This is a partial schematic diagram of a moving disk and a stationary disk in operation of an oil-free scroll machine provided by an embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of the assembly of a moving plate, a stationary plate and a crank assembly provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, ordinary technicians in this field can also derive other embodiments without making any creative work.

[0025] like Figure 1 As shown, an example of an oil-free scroll machine according to an embodiment of the present invention includes a stator plate 1, a rotor plate 2, a crank assembly 3, a main shaft assembly 4, and a frame 5. The rotor plate 2 performs planar circular motion under the drive of the main shaft assembly 4 and the restraint of the crank assembly 3. The stator plate 1 and the rotor plate 2 mesh with each other to form a working chamber, the volume of which changes sequentially. The chamber is connected to the system pipeline through a first communication port 104, a second communication port 105, and their associated joints.

[0026] like Figure 2 As shown, the static disk 1 includes a static scroll 101, which includes a first outer profile 101A and a first inner profile 101B. The tail of the outermost scroll is closed and connected to the inner static scroll through a curved wall 109, forming a closed cavity isolated from the environment.

[0027] The moving disk 2 includes a moving scroll 201 and a bottom plate 203. Figure 3 As shown, the orbiting scroll 201 includes a second outer profile 201A and a second inner profile 201B. The outer edge of the bottom plate 203 is always outside the fixed scroll 101 and the curved wall 109 during operation of the movable plate 2 to prevent the working chamber from communicating with the external environment.

[0028] The stator plate 1 and the base plate 203 are provided with a stator plate crank mounting hole 106 and a movable plate crank mounting hole 204 in the external environment. Both ends of the crank assembly 3 are connected to the stator plate crank mounting hole 106 and the movable plate crank mounting hole 204. The stator plate 1 also includes a frame mounting hole 107, which is connected to the positioning structure 501 on the frame 5 through a connecting piece 108. An assembly space for the main shaft assembly 4 is left between the frame 5 and the movable plate 2.

[0029] like Figure 2 As shown, the number of coils of the first inner profile 101B of the stator 1 is greater than that of the first outer profile 101A. Figure 3 As shown, the number of turns of the second outer profile 201A of the moving disk 2 is greater than the number of turns of the second inner profile 201B;

[0030] In one possible embodiment, the number of turns of the first inner profile 101B of the static disk 1 is half a turn more than the number of turns of the first outer profile 101A, and the number of turns of the second outer profile 201A of the dynamic disk 2 is half a turn more than the number of turns of the second inner profile 201B.

[0031] The tooth tops of the stationary scroll gear 101 and the movable scroll gear 201 are grooved along their respective tooth profiles, and spiral static sealing strips 102 and movable sealing strips 202 are installed in the grooves of the tooth tops of the stationary scroll gear 101 and the movable scroll gear 201 respectively.

[0032] Furthermore, a curved section is added to the tail of the static sealing strip 102 and a groove is opened along the top of the curved wall 109. The curved section of the tail of the static sealing strip 102 is installed in the groove at the top of the curved wall 109 and is connected to the static sealing strip 102 in the groove at the tooth top of the inner static vortex tooth 101.

[0033] The spindle assembly 4 includes an eccentrically arranged first spindle 401 and a second spindle 402 , and a balancing weight 405 arranged at the connection between the first spindle 401 and the second spindle 402 .

[0034] The eccentricity of the crank assembly 3 is equal to the eccentricity of the main shaft assembly 4, and both ends of the crank assembly 3 are equipped with self-lubricating crank rolling bearings.

[0035] One end of the spindle connected to the moving plate 2 in the spindle assembly 4 is equipped with a self-lubricating first spindle rolling bearing 403, and the other end of the spindle is equipped with a second spindle rolling bearing 404. The second spindle rolling bearing 404 is installed in the mounting hole 502 in the center of the frame 5.

[0036] One end of the main shaft is connected to the motor outside the frame 5 for providing driving force.

[0037] like Figure 4 As shown, the oil-free scroll machine according to the embodiment of the present invention is provided with a heat sink 11 to cool the stator 1 and the bearings.

[0038] According to an embodiment of the present invention, the oil-free scroll machine achieves high-precision operation by directly connecting the stator plate 1 and the rotor plate 2 via a crankshaft. The use of a curved wall 109 to enclose the stator plate 1 reduces the overall dimensions of the scroll machine and prevents leakage of the working fluid into the environment. Furthermore, locating the rolling bearings of the small crankshaft and the main shaft assembly in the external environment improves the cooling efficiency of the rolling bearings. This embodiment of the present invention achieves the goals of improved equipment reliability, simple structure, and high operational efficiency.

[0039] Specifically, the embodiment of the present invention drives the main shaft to rotate through a motor, and uses a crank to directly connect the moving disk 2 and the static disk 1 to limit the moving disk 2 driven by the main shaft to achieve high-precision planar revolution. The volume of the closed working chamber formed between the moving and static scroll teeth changes with the rotation of the crankshaft, thereby realizing the operation of the working fluid pressure. When the working fluid is in the closed chamber formed by the first connecting port 104 and the curved wall 109 of the static disk 1, it is isolated from the outside world by the top of the curved wall 109 and the bottom plate 203 of the moving disk 2 and its sealing strip, thereby preventing the mass exchange between the working fluid and the environment. The outer profile of the moving scroll tooth 201 and the inner profile of the static scroll tooth 101 are extended, so that the formation time of the outermost crescent-shaped closed chamber of the scroll machine is advanced, and the formation area is expanded, thereby increasing the stroke volume and space utilization efficiency of the scroll machine and reducing the external dimensions of the scroll machine at the same power.

[0040] During operation, the scroll machine of the present invention maintains stable pressure on the rolling bearings of the main shaft assembly 4 and the crankshaft assembly 3, protecting the bearing lubricant. Furthermore, the eccentric shafts of the main shaft and crankshaft stir the ambient air during operation, enhancing convective heat transfer between the air and the bearings and improving bearing cooling. Furthermore, the direct exposure of the bearings to the external environment facilitates simpler forced air or water cooling.

[0041] In the present invention, the terms "first", "second" and "third" are used for descriptive purposes only to distinguish one entity or operation from another operation or entity, and should not be understood as indicating or implying the relative importance of the operations or entities. The terms "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only used to facilitate the description of the present invention and simplify the description, and are not necessarily or implying that the device or element referred to must have an orientation, be constructed or operate in a specific orientation. Moreover, the term "comprises" and its variations are intended to cover non-exclusive inclusion, so that a process, method, article or device component that includes a series of elements includes those elements, and also includes other elements not explicitly listed, or sometimes also includes elements inherent to such process, method, article or device.

[0042] It should be noted that the above description is merely an example of a preferred embodiment of the present invention, and the present invention is not limited to the precise structure described above and illustrated in the accompanying drawings. The present invention is intended to cover any variations, uses, and applicability variations that follow the general principles of the present invention and include common knowledge or customary means in the art not disclosed herein. The scope of the present invention is limited solely by the appended claims.

Claims

1. An oil-free scroll machine, characterized in that: The invention comprises a static disk (1), a dynamic disk (2), a crank assembly (3), a main shaft assembly (4) and a frame (5); the dynamic disk (2) is connected to the main shaft assembly (4); a plurality of crank assemblies (3) are arranged on the periphery of the dynamic disk (2); the dynamic disk (2) performs planar circular motion under the drive of the main shaft assembly (4) and the restriction of the crank assembly (3); the static disk (1) and the dynamic disk (2) are meshed with each other to form a working chamber with a volume that changes sequentially; the static disk (1) comprises a static scroll (101), the static scroll (101) comprises a first outer profile (101A) and a first inner profile (101B); the outermost tail of the static scroll (101) is closed and connected to the inner static scroll (101) through a curved wall (109); the dynamic disk (2) comprises a dynamic scroll (201) and a bottom plate (201B); 3), the movable scroll gear (201) includes a second outer profile line (201A) and a second inner profile line (201B), and the outer edge of the base plate (203) is always located outside the static scroll gear (101) and the crank assembly (3) during the operation of the movable disk (2); the static disk (1) and the base plate (203) are provided with a static disk crank mounting hole (106) and a dynamic disk crank mounting hole (204) in the external environment, and the two ends of the crank assembly (3) are connected to the static disk crank mounting hole (106) and the dynamic disk crank mounting hole (204), and the static disk (1) is also provided with a frame mounting hole (107), and the frame (5) is connected to the frame mounting hole (107) along the axial direction on the outside of the movable disk (2) through a connecting piece (108), and an assembly space for the main shaft assembly (4) is reserved between the frame (5) and the movable disk (2).

2. The oil-free scroll machine according to claim 1, characterized in that: The number of turns of the first inner profile line (101B) is greater than the number of turns of the first outer profile line (101A); the number of turns of the second outer profile line (201A) is greater than the number of turns of the second inner profile line (201B).

3. The oil-free scroll machine according to claim 2, characterized in that: The number of turns of the first inner profile line (101B) is half a turn more than the number of turns of the first outer profile line (101A); and the number of turns of the second outer profile line (201A) is half a turn more than the number of turns of the second inner profile line (201B).

4. The oil-free scroll machine according to claim 1, characterized in that: The tooth tops of the static scroll gear (101) and the movable scroll gear (201) are grooved along their respective tooth profiles, and the grooves of the tooth tops of the static scroll gear (101) and the movable scroll gear (201) are respectively equipped with a static sealing strip (102) and a dynamic sealing strip (202).

5. The oil-free scroll machine according to claim 4, characterized in that: A curved section is added to the tail of the static sealing strip (102), and a groove is opened along the top of the curved wall (109). The curved section at the tail of the static sealing strip (102) is installed in the groove at the top of the curved wall (109) and is connected to the static sealing strip (102) in the groove at the tooth top of the inner static scroll tooth (101).

6. The oil-free scroll machine according to claim 1, characterized in that: The spindle assembly (4) comprises an eccentrically arranged first spindle (401) and a second spindle (402), and a balancing weight (405) arranged at the connection between the first spindle (401) and the second spindle (402).

7. The oil-free scroll machine according to claim 6, characterized in that: The eccentricity of the crank assembly (3) is equal to the eccentricity of the main shaft assembly (4), and both ends of the crank assembly (3) are equipped with self-lubricating crank rolling bearings.

8. The oil-free scroll machine according to claim 7, characterized in that: One end of the main shaft connected to the moving disk (2) in the main shaft assembly (4) is equipped with a self-lubricating first main shaft rolling bearing (403), and the other end of the main shaft is equipped with a second main shaft rolling bearing (404). The second main shaft rolling bearing (404) is installed in the mounting hole (502) at the center of the frame (5).

9. The oil-free scroll machine according to claim 8, characterized in that: It also includes a heat dissipation structure (11) for cooling the stator (1) and each bearing.

10. The oil-free scroll machine according to claim 8, characterized in that: One end of the main shaft is connected to a motor outside the frame (5) for providing driving force.

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