Double-cavity scroll compressor

Abstract

The double-cavity scroll compressor comprises a shell, two scroll assemblies and a power assembly, and the shell is provided with two compression cavities and a mounting cavity; the two vortex assemblies are rotationally mounted in the two compression cavities; the power assembly comprises a main shaft, a stator and two rotors, the main shaft is rotationally mounted in the mounting cavity and extends into the two compression cavities to be connected with the two vortex assemblies, the stator is arranged in the mounting cavity, the two rotors are located on the two opposite sides of the stator, and the two rotors are both connected with the main shaft. The two rotors are arranged on the two opposite sides of the stator, the size of the rotors and the size of the stator are greatly reduced, then the size of the whole device is reduced, and the integration level is high.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly relates to a double-chamber scroll compressor. Background Art

[0002] A compressor is a fluid machine that raises low-pressure gas to high-pressure gas and is a core device in a refrigeration system. A scroll compressor is a typical positive-displacement compressor.

[0003] Patent CN104863856A discloses a scroll compressor with two scroll disks, which includes a stator, a rotor, two moving scroll disks, two stationary scroll disks, and a housing. The stator is fixedly installed in the housing. The rotor passes through the stator from one side and cooperates with it to form an electric motor. The two moving scroll disks are respectively installed at both ends of the rotor, and the two stationary scroll disks are respectively fixedly installed at both ends of the housing. The two moving scroll disks respectively cooperate with the two stationary scroll disks, and two independent sets of scroll compression cavities are respectively formed between the two moving scroll disks and the two stationary scroll disks. The housing is respectively provided with gas return ports, and the two stationary scroll disks are respectively provided with exhaust ports.

[0004] In the above prior art, the stator is fixedly installed in the housing, and the rotor passes through the stator from one side and cooperates with it to form an electric motor, making the whole device have a large volume and low integration. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies, and propose a double-chamber scroll compressor to solve the technical problems of large volume and low integration of the whole device in the prior art.

[0006] To achieve the above technical purpose, the present invention adopts the following technical solutions: The present invention provides a double-chamber scroll compressor, including: A housing, provided with two compression chambers and an installation chamber; Two scroll assemblies, rotatably installed in the two compression chambers; and A power assembly, including a main shaft, a stator, and two rotors. The main shaft is rotatably installed in the installation chamber and extends into the two compression chambers to be connected with the two scroll assemblies. The stator is arranged in the installation chamber. The two rotors are located on opposite sides of the stator, and both of the two rotors are connected to the main shaft.

[0007] In some embodiments, the rotor includes a rotor yoke and a plurality of permanent magnets. The rotor yoke is arranged on the main shaft, and the plurality of permanent magnets are arranged on the side of the rotor yoke facing the stator. The plurality of permanent magnets are arranged in a Halbach array.

[0008] In some embodiments, the included angle of the magnetization directions of adjacent permanent magnets is 45°, and the radial distance between adjacent permanent magnets is 1.2 times the pole width thereof.

[0009] In some embodiments, the stator includes an iron core and a plurality of coil windings. The iron core is provided with a plurality of wire-winding posts, and the plurality of wire-winding posts correspond to the plurality of permanent magnets one by one. The coil windings are wound around the outer periphery of the wire-winding posts.

[0010] In some embodiments, eccentric shafts are provided at both ends of the main shaft; The scroll assembly includes a stationary scroll and a moving scroll. The stationary scroll is disposed in the compression chamber. The moving scroll is connected to the eccentric shaft, and the moving scroll meshes with the stationary scroll.

[0011] In some embodiments, the housing is further provided with an air inlet communicating the two compression chambers. The compression chamber is further provided with an air outlet, and a pressure valve is provided at the air outlet.

[0012] In some embodiments, counterweights are provided at both ends of the main shaft.

[0013] In some embodiments, the counterweight includes an eccentric block. The eccentric block includes a connecting portion and an eccentric portion. The connecting portion is adapted to the main shaft, the connecting portion is connected to one end of the main shaft, the eccentric portion is fan-shaped, and the eccentric portion is disposed on the outer periphery of the connecting portion.

[0014] In some embodiments, the housing includes a cylinder, two brackets and two covers. The cylinder is provided with an installation channel penetrating therethrough. The two brackets are spaced apart and disposed in the installation channel. An installation cavity is formed by enclosing between the two brackets. The two covers are respectively disposed on both ends of the cylinder, and a compression chamber is formed between the cover and the bracket.

[0015] In some embodiments, the cover is detachably connected to the cylinder, and the bracket is detachably connected to the cylinder.

[0016] Compared with the prior art, for the twin-scroll compressor provided by the present invention, the two compression chambers and the installation chamber are arranged at intervals, and the compression chamber and the installation chamber are communicated through through-holes. Two scroll assemblies are rotatably installed in the two compression chambers to compress the refrigerant by the movement of the scroll assemblies in the compression chambers. The stator is fixedly installed in the installation chamber, the main body part of the main shaft is rotatably installed in the installation chamber, and a part of it extends into the compression chamber and is connected to the scroll assembly. The rotor is fixedly installed on the main shaft, and the two rotors are located on opposite sides of the stator. When the stator is powered on, a periodically changing magnetic pole can be generated, thereby driving the two rotors and the main shaft to rotate, and then driving the scroll assembly to work to realize the compression of the refrigerant. In this application, the two rotors are arranged on opposite sides of the stator, greatly reducing the volume of the rotors and the stator, and thus reducing the volume of the entire device, with high integration.

[0017] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and to implement it in accordance with the content of the description, the preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. The specific embodiments of the present invention are given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of an embodiment of the twin-scroll compressor provided by the present invention; Figure 2 is Figure 1 the explosion diagram of the twin-scroll compressor in ; Figure 3 is Figure 1 the three-dimensional schematic diagram of the rotor in ; Figure 4 is Figure 1 the three-dimensional schematic diagram of the stator in ; Figure 5 is Figure 1 the cross-sectional view of the stator in ; Figure 6 is Figure 1 the three-dimensional schematic diagram of the coil winding in ; Figure 7 is Figure 1 the three-dimensional schematic diagram of the cylinder body in ; Figure 8 is Figure 1 the cross-sectional view of the cylinder body in ; Figure 9 is Figure 1 the three-dimensional schematic diagram of the eccentric block in ; Figure 10 is Figure 1 the three-dimensional schematic diagram of the main shaft in.

[0019] Description of the reference numerals in the drawings: 1 - housing, 11 - compression chamber, 12 - installation chamber; 13 - cylinder, 131 - installation groove, 132 - avoidance groove, 133 - flow channel, 14 - bracket, 15 - cover plate, 16 - air inlet, 17 - air outlet, 2 - scroll assembly, 21 - stationary scroll, 22 - orbiting scroll, 3 - main shaft, 31 - eccentric shaft, 4 - stator, 41 - iron core, 411 - winding post, 412 - installation protrusion, 413 - installation through - hole, 42 - coil winding, 5 - rotor, 51 - rotor yoke, 52 - permanent magnet, 6 - eccentric block, 61 - connecting portion, 62 - eccentric portion. Detailed implementation manners

[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] In order to solve the technical problem that the entire device in the prior art has a relatively large volume and a low integration degree, the present invention provides a double - chamber scroll compressor. By arranging two of the rotors on opposite sides of the stator, the volume of the rotors and the stator is greatly reduced, thereby reducing the volume of the entire device and having a high integration degree.

[0022] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a double - chamber scroll compressor in an embodiment of the present invention.

[0023] The present invention provides a double - chamber scroll compressor, including a housing 1, two scroll assemblies 2 and a power assembly. The housing 1 is provided with two compression chambers 11 and an installation chamber 12; the two scroll assemblies 2 are rotatably installed in the two compression chambers 11; and the power assembly includes a main shaft 3, a stator 4 and two rotors 5. The main shaft 3 is rotatably installed in the installation chamber 12 and extends into the two compression chambers 11 to be connected with the two scroll assemblies 2. The stator 4 is arranged in the installation chamber 12, and the two rotors 5 are located on opposite sides of the stator 4. Both of the two rotors 5 are connected to the main shaft 3.

[0024] In this embodiment, please refer to Figure 1 and Figure 2, the two compression chambers 11 and the installation chamber 12 are arranged at intervals, and the compression chamber 11 and the installation chamber 12 are communicated through through holes. Two scroll components 2 are rotatably installed in the two compression chambers 11 to compress the refrigerant by the activities of the scroll components 2 in the compression chambers 11. The stator 4 is fixedly installed in the installation chamber 12. The main body part of the main shaft 3 is rotatably installed in the installation chamber 12, and a part of it extends into the compression chamber 11 to be connected with the scroll component 2. The rotor 5 is fixedly installed on the main shaft 3, and the two rotors 5 are located on opposite sides of the stator 4. When the stator 4 is powered on, it can generate periodically changing magnetic poles, thereby driving the two rotors 5 and the main shaft 3 to rotate, and further driving the scroll component 2 to work to realize the compression of the refrigerant. In this application, the two rotors 5 are arranged on opposite sides of the stator 4, greatly reducing the volume of the rotors 5 and the stator 4, and thus reducing the volume of the entire device, with high integration.

[0025] In this embodiment, please refer to Figure 1 and Figure 2 , the compression chamber 11 and the installation chamber 12 are both arranged in a cylindrical shape, and the compression chamber 11 and the installation chamber 12 are coaxially arranged. The stator 4 is provided with an installation hole in the middle, and the stator 4 is installed on the side wall of the installation chamber 12. A first bearing is arranged in the installation hole, and the middle part of the main shaft 3 passes through the first bearing, so that the main shaft 3 can rotate relative to the stator 4 and the housing 1. The middle part of the rotor 5 is provided with a through hole, and the diameter of the through hole is slightly larger than the diameter of the main shaft 3. The rotor 5 is sleeved on the rotating shaft, and the rotor 5 is connected with the inner ring of the first bearing, so as to achieve the purpose of synchronous rotation of the rotating shaft and the main shaft 3.

[0026] The connection method between the stator 4 and the housing 1 is not limited. In this embodiment, the stator 4 is bolted to the housing 1.

[0027] Specifically, please refer to Figure 4 , Figure 5 and Figure 7 , a plurality of installation protrusions 412 are arranged on the outer periphery of the stator 4, and the plurality of installation protrusions 412 are arranged at intervals along the circumferential direction of the stator 4. Each installation protrusion 412 is provided with an installation through hole 413. A plurality of threaded holes are arranged on the side wall of the installation chamber 12, and the plurality of threaded holes correspond to the plurality of installation through holes 413 one by one. The double-chamber scroll compressor further includes a plurality of first bolts, and the plurality of first bolts correspond to the plurality of installation through holes 413 one by one. Each first bolt passes through the corresponding installation through hole 413 and is threadedly connected with the threaded hole, so as to fixedly install the stator 4 on the side wall of the installation chamber 12.

[0028] Furthermore, please refer toFigure 4 , Figure 5 and Figure 7 , the side wall of the installation cavity 12 is provided with a plurality of installation grooves 131 and a plurality of avoidance grooves 132. The plurality of installation grooves 131 are arranged at intervals along the circumferential direction of the installation cavity 12 and correspond to the plurality of threaded holes one by one. The installation grooves 131 extend along the circumferential direction of the installation cavity 12. One end of the installation groove 131 communicates with the threaded hole. The plurality of avoidance grooves 132 correspond to the plurality of installation grooves 131 one by one. The plurality of avoidance grooves 132 extend along the vertical direction and extend to both ends of the housing 1 to form openings. The avoidance groove 132 communicates with the other end of the installation groove 131. The avoidance groove 132 is adapted to the installation protrusion 412. The installation protrusion 412 extends into the avoidance groove 132 from the opening and is rotatably installed in the installation groove 131 to radially limit the stator 4 through the installation groove 131.

[0029] Furthermore, a plurality of the installation protrusions 412 are provided on both opposite sides of the stator 4. Correspondingly, two groups of the plurality of installation grooves 131 are provided along the radial direction.

[0030] Further, the connection manner between the rotor 5 and the first bearing is not limited. In this embodiment, threaded holes are provided on both opposite sides of the inner ring of the first bearing. The rotating shaft is provided with through holes corresponding to the threaded holes. The double-scroll compressor further includes a second bolt. The second bolt passes through the through holes and is connected to the threaded holes to install the rotating shaft on the inner ring of the first bearing, so as to ensure that the rotating shaft, the inner ring of the first bearing, and the main shaft 3 rotate synchronously.

[0031] In this embodiment, please refer to Figure 3 , the rotor 5 includes a rotor yoke 51 and a plurality of permanent magnets 52. The rotor yoke 51 is arranged on the main shaft 3. The plurality of permanent magnets 52 are arranged on one side of the rotor yoke 51 facing the stator 4. The plurality of permanent magnets 52 are arranged in a Halbach array.

[0032] Specifically, eight permanent magnets 52 are provided. The permanent magnets 52 are generally fan-shaped. The eight permanent magnets 52 are evenly arranged at intervals along the circumferential direction of the rotor yoke 51. And the permanent magnets 52 are arranged in a Halbach array. Such an arrangement can greatly improve the magnetic field strength and reduce the volume of the rotor 5, which is beneficial to reducing the volume of the entire device.

[0033] In this embodiment, the included angle between the magnetization directions of adjacent permanent magnets 52 is 45°. The radial distance between adjacent permanent magnets 52 is 1.2 times the pole width of them.

[0034] In this embodiment, please refer to Figure 4 ,Figure 5 and Figure 6 The stator 4 includes an iron core 41 and a plurality of coil windings 42. The iron core 41 is provided with a plurality of winding posts 411. The plurality of winding posts 411 correspond to the plurality of permanent magnets 52 one by one, and the coil windings 42 are wound around the outer periphery of the winding posts 411.

[0035] Specifically, the mounting hole is provided in the middle of the iron core 41. The iron core 41 is mounted on the outer ring of the first bearing. The iron core 41 is provided with a plurality of winding posts 411. The plurality of winding posts 411 are arranged at intervals along the circumferential direction of the iron core 41. The coil windings 42 are wound around the outer periphery of the winding posts 411, and the coil windings 42 are used for connecting to an external power supply.

[0036] In this embodiment, please refer to Figure 1 、 Figure 2 and Figure 10 Both ends of the main shaft 3 are provided with eccentric shafts 31. The scroll assembly 2 includes a stationary scroll 21 and a moving scroll 22. The stationary scroll 21 is arranged in the compression chamber 11. The moving scroll 22 is connected to the eccentric shaft 31, and the moving scroll 22 meshes with the stationary scroll 21.

[0037] Specifically, the axis of the eccentric shaft 31 is arranged non-coaxially with the axis of the main shaft 3, so that when the main shaft 3 rotates, the eccentric shaft 31 can revolve around the axis of the main shaft 3. The moving scroll 22 is connected to the eccentric shaft 31, thereby driving the moving scroll 22 to revolve around the axis of the main shaft 3. By the rotation of the moving scroll 22 in the stationary scroll 21, compression is achieved.

[0038] In this embodiment, please refer to Figure 1 、 Figure 7 and Figure 8 The housing 1 is further provided with an air inlet 16 communicating the two compression chambers 11. The compression chamber 11 is further provided with an air outlet 17, and a pressure valve is provided at the air outlet 17.

[0039] Specifically, the air inlet 16 is provided on the outer side of the housing 1. A flow channel 133 communicating the compression chamber 11 and the air inlet 16 is further provided in the housing 1. The flow channel 133 is annularly arranged in the housing 1. Exhaust ports 17 are provided in the middle of both ends of the housing 1. The exhaust ports 17 communicate with the space enclosed by the moving scroll disk 22 and the stationary scroll disk 21. An air suction port communicating the compression chamber 11 and the space enclosed by the moving scroll disk 22 and the stationary scroll disk 21 is further provided on the circumference of the stationary scroll disk 21. During operation, gas enters the space enclosed by the moving scroll disk 22 and the stationary scroll disk 21 from the air inlet 16, the flow channel 133 and the air suction port. When the moving scroll disk 22 rotates to squeeze the space enclosed by the moving scroll disk 22 and the stationary scroll disk 21, the gas is compressed and discharged from the exhaust ports 17, realizing the compression of the gas.

[0040] Further, a one-way pressure limiting valve is also provided at the exhaust port 17.

[0041] In this embodiment, please refer to Figure 1 、 Figure 2 and Figure 9 Both ends of the main shaft 3 are provided with counterweight members. Such a setting can achieve the purpose of counterweight.

[0042] In this embodiment, please refer to Figure 9 The counterweight member includes an eccentric block 6. The eccentric block 6 includes a connecting portion 61 and an eccentric portion 62. The connecting portion 61 is adapted to the main shaft 3. The connecting portion 61 is connected to one end of the main shaft 3. The eccentric portion 62 is fan-shaped. The eccentric portion 62 is provided on the outer periphery of the connecting portion 61.

[0043] Specifically, the connecting portion 61 is columnar and has the same diameter as the main shaft 3. The connecting portion 61 is provided with a through hole corresponding to the eccentric shaft 31. The connecting portion 61 is installed on the outer periphery of the eccentric shaft 31 and abuts against the end face of the main shaft 3. The eccentric portion 62 is fan-shaped, and the connecting portion 61 and the eccentric portion 62 are arranged staggeredly in the axial direction. When the connecting portion 61 is installed on the eccentric shaft 31, the eccentric portion 62 abuts against the side face of the main shaft 3. Such a setting is beneficial to the installation of the connecting portion 61.

[0044] Further, the connecting portion 61 is connected to the moving scroll disk 22 through a bearing.

[0045] In this embodiment, please refer to Figure 1 、 Figure 2 and Figure 7, the housing 1 includes a cylinder 13, two brackets 14 and two covers 15. The cylinder 13 is provided with an installation channel running through it. The two brackets 14 are arranged at intervals in the installation channel. An installation cavity 12 is formed by enclosing between the two brackets 14. The two covers 15 are respectively covered at both ends of the cylinder 13. A compression cavity 11 is formed between the cover 15 and the bracket 14.

[0046] Specifically, the bracket 14 is adapted to the installation channel. The two brackets 14 are axially spaced and installed in the installation channel. The space between the two brackets 14 is the installation cavity 12. The stator 4, the rotor 5 and the main shaft 3 are all arranged in the installation cavity 12. A through hole is provided in the middle of the bracket 14. The main shaft 3 passes through the channel and is connected to the moving scroll 22. The cover 15 is adapted to the cylinder 13. The cover 15 is installed at both ends of the cylinder 13 to block both ends of the installation channel. The space between the cover 15 and the bracket 14 is the compression cavity 11. The scroll assembly 2 and the counterweight are both located in the compression cavity 11.

[0047] In this embodiment, the cover 15 is detachably connected to the cylinder 13, and the bracket 14 is detachably connected to the cylinder 13. Such a setting facilitates the production and assembly of the device.

[0048] Specifically, the cover 15 and the cylinder 13 are bolted. A limiting step is provided in the cylinder 13. One end of the bracket 14 abuts against the limiting step, and the other end of the bracket 14 abuts against the cover 15, so as to fix the bracket 14 in the cylinder 13 by means of the cover 15.

[0049] For a better understanding of the present invention, the following combines Figures 1 to 10 to elaborate on the technical solution of the present invention in detail: First, wind the eight coil windings 42 around the eight winding posts 411 respectively. Then, insert the mounting protrusion 412 into the mounting channel from the avoidance groove 132. Rotate the stator 4 to make the mounting protrusion 412 rotate into the mounting groove 131 and align the mounting channel with the threaded hole to achieve axial positioning. Thread the first bolt through the corresponding mounting through-hole 413 and thread it with the threaded hole, thereby fixedly mounting the stator 4 on the side wall of the mounting cavity 12. Install the first bearing and the main shaft 3, insert the two rotors 5 from the opposite sides of the stator 4 respectively, and fix the rotors 5 on the inner ring of the first bearing so that the rotors 5 and the main shaft 3 can rotate synchronously. Insert the two brackets 14 into the cylinder body 13 from both sides, then install the eccentric block 6 and the moving scroll 22. Fix the stationary scroll 21 on the cover plate 15, and finally install the cover plate 15 on the cylinder body 13 to complete the assembly of the device. When in use, energize the coil winding 42 to make the stator 4 generate periodically changing magnetic poles, thereby driving the two rotors 5 and the main shaft 3 to rotate, and then driving the moving scroll 22 to revolve around the axis of the main shaft 3, so that gas enters the space enclosed by the moving scroll 22 and the stationary scroll 21 from the air inlet 16, the flow channel 133 and the suction port. When the moving scroll 22 rotates, it compresses the space enclosed by the moving scroll 22 and the stationary scroll 21 to compress the gas, and the gas is discharged from the exhaust port 17 to achieve gas compression.

[0050] The scroll compressor of the present application benefits from the use of an axial-flux motor, the axial length of the system is shortened, the overall volume of the compressor is greatly reduced, the torque provided for the compression chamber 11 is increased, the axial force balance avoids the rapid wear of the main shaft 3, and the design of the double compression chamber 11 greatly increases the efficiency of a single compressor.

[0051] The specific embodiments of the present invention described above do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A double-chamber scroll compressor, characterized in that, It includes: A housing, which is provided with two compression chambers and an installation chamber, and the two compression chambers are located on opposite sides of the installation chamber; Two scroll components, which are rotatably installed in the two compression chambers; And A power component, which includes a main shaft, a stator and two rotors. The main shaft is rotatably installed in the installation chamber, and both ends thereof extend into the two compression chambers and are connected to the two scroll components. The stator is arranged in the installation chamber, the two rotors are located on opposite sides of the stator, and both the two rotors are connected to the main shaft.

2. The twin-scroll compressor according to claim 1, wherein The rotor includes a rotor yoke and a plurality of permanent magnets. The rotor yoke is arranged on the main shaft, and the plurality of permanent magnets are arranged on one side of the rotor yoke facing the stator, and the plurality of permanent magnets are arranged in a Halbach array.

3. The twin-scroll compressor according to claim 2, wherein The included angle of the magnetization directions of adjacent permanent magnets is 45°, and the radial distance between adjacent permanent magnets is 1.2 times the pole width thereof.

4. The twin-scroll compressor according to claim 2, wherein, The stator includes an iron core and a plurality of coil windings. The iron core is provided with a plurality of winding posts, and the plurality of winding posts correspond to the plurality of permanent magnets one by one, and the coil windings are wound around the outer periphery of the winding posts.

5. The twin-scroll compressor according to claim 1, wherein, Both ends of the main shaft are provided with eccentric shafts; The scroll component includes a stationary scroll plate and a moving scroll plate. The stationary scroll plate is arranged in the compression chamber, the moving scroll plate is connected to the eccentric shaft, and the moving scroll plate meshes with the stationary scroll plate.

6. The twin-scroll compressor according to claim 1, wherein The housing is further provided with an air inlet communicating the two compression chambers, and the compression chamber is further provided with an air outlet, and a pressure valve is arranged at the air outlet.

7. The twin-scroll compressor according to claim 1, wherein Both ends of the main shaft are provided with counterweight members.

8. The twin-scroll compressor according to claim 7, wherein, The counterweight member includes an eccentric block. The eccentric block includes a connecting portion and an eccentric portion. The connecting portion is adapted to the main shaft, the connecting portion is connected to one end of the main shaft, the eccentric portion is fan-shaped, and the eccentric portion is arranged on the outer periphery of the connecting portion.

9. The double-chamber scroll compressor according to claim 1, wherein, The housing includes a cylinder body, two brackets and two covers. The cylinder body is provided with an installation channel running through it. The two brackets are arranged in the installation channel at intervals, and the installation chamber is formed by enclosing between the two brackets. The two covers are respectively covered on both ends of the cylinder body, and the compression chamber is formed between the cover and the bracket.

10. The twin-scroll compressor according to claim 9, characterized in that, The cover is detachably connected to the cylinder body, and the bracket is detachably connected to the cylinder body.

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