Energy recovery type scroll compressor and carbon dioxide heat pump system using same

Abstract

An energy recovery type scroll compressor and a carbon dioxide heat pump system using same. The compressor comprises: a scroll compression mechanism, a driving mechanism, and a scroll expansion mechanism; one end of a motor shaft (703) of the driving mechanism is transmittingly connected to the scroll compression mechanism, and the other end is transmittingly connected to the scroll expansion mechanism; the motor shaft (703) of the driving mechanism is transmittingly connected to a loaded orbiting scroll (5) of the scroll expansion mechanism, and the end of an unloaded orbiting scroll (3) of the scroll expansion mechanism distant from the loaded orbiting scroll (5) is an air intake hollow shaft (1); and an air inlet is communicated with an expansion end high-pressure working medium channel (a), and an expansion cavity of the scroll expansion mechanism is communicated with an expansion end low-pressure working medium channel (b).

Description

Energy recovery scroll compressor and carbon dioxide heat pump system using the same Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to an energy recovery scroll compressor and a carbon dioxide heat pump system using the same. Background Art

[0002] The scroll compressor has the advantages of simple structure, smooth operation, low noise, high mechanical efficiency and high volumetric efficiency. It is widely used in various fields such as industry and life. The movable and static scrolls of the scroll compressor are assembled with a difference of 180 degrees and offset to determine the orbital radius. The movable scroll is driven by a crankshaft with an eccentric radius as its orbital radius to achieve its orbital translation. During the movement of the movable scroll, it engages with the static scroll to form several pairs of crescent-shaped closed working chambers with continuously changing volumes, which are the first (center chamber), second, and third compression chambers (intake chambers) from the inside to the outside; when the compressor is working, the volume of the compression chamber changes with the main shaft angle. When the compression is completed, the second compression chamber is connected to the center chamber, and the gas is discharged through the exhaust hole. The working medium undergoes three processes of suction, compression, and exhaust in the crescent working chamber.

[0003] Scroll compressors are widely used in the field of heat pump air conditioning. Transcritical carbon dioxide circulation heat pumps are widely developed and applied as a new technology that is efficient, energy-saving and environmentally friendly because of their non-pollution and non-destructive nature, stable system operation, compact equipment and high system energy efficiency ratio. However, due to the high operating pressure of transcritical carbon dioxide circulation heat pumps, the throttling pressure difference between the high-pressure side and the low-pressure side can reach 6-8MPa. Therefore, transcritical carbon dioxide circulation heat pumps still have the problem of large throttling losses.

[0004] Therefore, people are in urgent need of an energy recovery scroll compressor that can recover throttling energy, reduce energy consumption, and improve energy utilization.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to provide an energy recovery scroll compressor and a carbon dioxide heat pump system using the same, which utilizes a high-pressure working fluid to drive a scroll expansion mechanism to move, thereby driving the motor shaft of a driving mechanism to move, thereby realizing the recovery and utilization of the pressure energy of the high-pressure working fluid, reducing the energy consumption of the driving mechanism itself, and improving energy utilization.

[0007] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides an energy recovery scroll compressor and a carbon dioxide heat pump system using the same, comprising a scroll compression mechanism, a driving mechanism and a scroll expansion mechanism, wherein one end of the motor shaft of the driving mechanism is transmission-connected to the scroll compression mechanism, and the other end is transmission-connected to the scroll expansion mechanism, the scroll expansion mechanism comprises a loaded scroll disk and an unloaded scroll disk, the motor shaft of the driving motor is transmission-connected to the loaded scroll disk, the unloaded scroll disk has an end away from the loaded scroll disk as an air intake hollow shaft with an air intake hole centered thereon, the air intake hole is connected to the high-pressure working fluid channel at the expansion end, and the expansion cavity of the scroll expansion mechanism is connected to the low-pressure working fluid channel at the expansion end.

[0008] Preferably, the expansion cavity is communicated with the inner cavity of the driving mechanism, and the expansion-end low-pressure working medium channel is communicated with the expansion cavity through the inner cavity of the driving mechanism.

[0009] Preferably, the scroll compression mechanism, the driving mechanism and the scroll expansion mechanism are arranged in sequence from top to bottom, and a fixing bracket is provided at the bottom of the scroll expansion mechanism.

[0010] Preferably, the scroll compression mechanism is a self-transforming scroll compression mechanism, and the scroll expansion mechanism is a self-transforming scroll expansion mechanism.

[0011] Preferably, the scroll compression mechanism includes a compressor pressure stabilizing shell, an active scroll, a transmission slip ring and a driven scroll, the compressor pressure stabilizing shell is arranged between one end of the driving mechanism and the driving mechanism to form a compression chamber, the active scroll, the transmission slip ring and the driven scroll are sequentially arranged in the compression chamber along a direction away from the driving mechanism, the active scroll is transmission-connected to the motor shaft of the driving mechanism, the active scroll is transmission-connected to the driven scroll through the transmission slip ring, an exhaust hollow shaft is provided at one end of the driven scroll away from the active scroll, the exhaust hollow shaft is communicated with a high-pressure exhaust passage, the compression chamber is communicated with a low-pressure intake passage, the exhaust hollow shaft is arranged in the compressor pressure stabilizing shell through a compressor bearing seat, and the phase difference between the active scroll and the driven scroll is 180°;

[0012] A first active friction surface and a second active friction surface are provided on opposite sides of the spiral tooth of the active scroll, wherein a first active portion in the form of a strip is provided radially on the first active friction surface, and a second active portion in the form of a strip is provided radially on the second active friction surface; a first driven friction surface and a second driven friction surface are provided on opposite sides of the spiral tooth of the driven scroll, wherein a first driven portion in the form of a strip is provided radially on the first driven friction surface, and a second driven portion in the form of a strip is provided radially on the second driven friction surface;

[0013] The transmission slip ring is provided with two first transmission slip ring matching parts on the end surface close to the active scroll plate, and the two first transmission slip ring matching parts respectively match the first active part and the second active part. The two first transmission slip ring matching parts divide the end surface of the transmission slip ring into a first transmission slip ring friction surface and a second transmission slip ring friction surface. The first transmission slip ring friction surface contacts the first active friction surface, and the second transmission slip ring friction surface contacts the second active friction surface. The transmission slip ring is provided with two second transmission slip ring matching parts on the end surface close to the driven scroll plate, and the two second transmission slip ring matching parts respectively match the first driven part and the second driven part. The two second transmission slip ring matching parts divide the end surface of the transmission slip ring into a third transmission slip ring friction surface and a fourth transmission slip ring friction surface. The third transmission slip ring friction surface contacts the first driven friction surface, and the fourth transmission slip ring friction surface contacts the second driven friction surface. The transmission slip ring is provided with a plurality of transmission slip ring vents in the radial direction for connecting the inside and the outside.

[0014] Preferably, the active scroll, the transmission slip ring and the driven scroll are all sprayed with a self-lubricating coating.

[0015] Preferably, the compression chamber is divided into a working chamber and a pressure stabilizing chamber by a bearing seat, the exhaust hollow shaft is connected to the high-pressure exhaust channel through the pressure stabilizing chamber, and the low-pressure air intake channel is connected to the working chamber, and the bearing seat is located on the end face of the pressure stabilizing chamber and is provided with a check valve to prevent gas backflow.

[0016] Preferably, the scroll expansion mechanism includes an expander pressure-stabilizing shell, a loaded scroll, a limiting slip ring, and an unloaded scroll. The expander pressure-stabilizing shell is arranged between one end of the driving mechanism and the driving mechanism to form the expansion cavity. The loaded scroll, the limiting slip ring, and the unloaded scroll are sequentially arranged in the expansion cavity in a direction away from the driving mechanism. The loaded scroll is transmission-connected to the motor shaft of the driving mechanism. The loaded scroll is transmission-connected to the unloaded scroll via the limiting slip ring. The phase difference between the loaded scroll and the unloaded scroll is 180°.

[0017] A first loaded friction surface and a second loaded friction surface are oppositely arranged on both sides of the scroll tooth of the loaded scroll, a first loaded portion in the form of a strip is radially arranged on the first loaded friction surface, and a second loaded portion in the form of a strip is radially arranged on the second loaded friction surface; a first unloaded friction surface and a second unloaded friction surface are oppositely arranged on both sides of the scroll tooth of the unloaded scroll, a first unloaded portion in the form of a strip is radially arranged on the first unloaded friction surface, and a second unloaded portion in the form of a strip is radially arranged on the second unloaded friction surface;

[0018] The end surface of the limiting slip ring close to the loaded scroll plate is relatively provided with two first limiting slip ring matching parts, the two first limiting slip ring matching parts respectively match with the first load part and the second load part, the two first limiting slip ring matching parts divide the end surface of the limiting slip ring into a first limiting slip ring friction surface and a second limiting slip ring friction surface, the first limiting slip ring friction surface contacts the first load friction surface, the second limiting slip ring friction surface contacts the second load friction surface, the limiting slip ring close to the unloaded scroll plate Two second limiting slip ring matching parts are arranged opposite to each other on the end surface, and the two second limiting slip ring matching parts match with the first no-load part and the second no-load part respectively. The two second limiting slip ring matching parts divide the end surface of the limiting slip ring into a third limiting slip ring friction surface and a fourth limiting slip ring friction surface. The third limiting slip ring friction surface contacts the first no-load friction surface, and the fourth limiting slip ring friction surface contacts the second no-load friction surface. A plurality of limiting slip ring vents for connecting the inside and the outside are opened radially on the limiting slip ring.

[0019] Preferably, the loaded scroll, the limiting slip ring and the unloaded scroll are all sprayed with a self-lubricating coating.

[0020] The present invention also provides a carbon dioxide heat pump system using the above-mentioned energy recovery scroll compressor, wherein the high-pressure side working medium outlet of the regenerator of the carbon dioxide heat pump system is connected to the high-pressure working medium channel of the expansion end, the working medium inlet of the evaporator of the carbon dioxide heat pump system is connected to the low-pressure working medium channel of the expansion end, the low-pressure side working medium outlet of the regenerator of the carbon dioxide heat pump system is connected to the low-pressure air inlet channel of the scroll compression mechanism, and the working medium inlet of the cooler of the carbon dioxide heat pump system is connected to the high-pressure exhaust channel of the scroll compression mechanism.

[0021] Compared with the prior art, the present invention mainly achieves the following technical effects:

[0022] By delivering high-pressure working fluid to the scroll expansion mechanism, the pressure energy of the high-pressure working fluid is converted into the rotation of the scroll expansion mechanism, and then the motor shaft of the driving mechanism is driven to rotate. This can reduce the energy consumption of the driving mechanism itself when driving the scroll compression mechanism to work. This is equivalent to combining the pressure energy with the electrical energy of the driving motor to drive the scroll compression mechanism to move, thereby realizing the recovery of the pressure energy of the high-pressure working fluid, while reducing the power consumption of the driving mechanism itself and improving energy utilization.

[0023] Compared with the prior art, other solutions of the present invention have achieved the following technical effects:

[0024] This device can replace the throttle valve, and the high-pressure working fluid after throttling expansion flows through the motor and absorbs the heat generated by the motor, solving the motor cooling problem. After this device is used in the carbon dioxide heat pump, the motor temperature is higher than the air temperature outside the evaporator, the heat exchange efficiency through the motor is higher, and the overall heat exchange efficiency is improved, that is, the waste heat of the motor is recovered to improve the heat exchange efficiency, improve the system working efficiency, and reduce the energy consumption of the overall unit.

[0025] It adopts a vertical structure, with the scroll compressor located on the upper part of the motor and the scroll expander located on the lower part of the motor. When this device is used for a carbon dioxide heat pump, the carbon dioxide working fluid is in a gas-liquid two-phase state after expanding through the expander. Due to the density difference, the liquid carbon dioxide is at the lower part and the gaseous carbon dioxide is at the upper part, which can separate the carbon dioxide gas and liquid.

[0026] A self-lubricating coating is used, which can effectively lubricate the active scroll, driven scroll, transmission slip ring of the scroll compression mechanism and the loaded scroll, unloaded scroll, and limit slip ring of the scroll expansion mechanism. The coating can also reduce the meshing clearance between the active scroll and driven scroll of the scroll compressor, reduce leakage, and improve compression efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] FIG1 is a schematic diagram of the appearance structure of an energy recovery scroll compressor according to the present invention;

[0029] FIG2 is a schematic cross-sectional view at the arrow in FIG1 ;

[0030] FIG3 is a schematic structural diagram of the active scroll of the present invention;

[0031] FIG4 is a schematic structural diagram of the driven scroll of the present invention;

[0032] FIG5 is a schematic structural diagram of a transmission slip ring according to the present invention;

[0033] FIG6 is a schematic structural diagram of a loaded scroll according to the present invention;

[0034] FIG7 is a schematic structural diagram of an unloaded scroll according to the present invention;

[0035] FIG8 is a schematic structural diagram of a limit slip ring according to the present invention;

[0036] Among them, 1. Inlet hollow shaft; 2. Expander bearing seat; 3. No-load scroll; 301. First no-load part; 302. First no-load friction surface; 303. Second no-load part; 304. Second no-load friction surface; 4. Limiting slip ring; 401. First limiting slip ring mating part; 402. Second limiting slip ring mating part; 403. First limiting slip ring friction surface; 404. Second limiting slip ring friction surface; 405. Third limiting slip ring friction surface; 406. Fourth limiting slip ring friction surface; 407. Limiting slip ring vent; 5. Loaded scroll; 501. First loaded part; 502. First loaded friction surface; 503. Second loaded part; 504. Second loaded friction surface; 6. Bottom bearing seat; 701. Motor stator; 702. Motor rotor; 703. Motor shaft; 8. Motor housing; 9. Active scroll; 901. First active part; 902. First active friction surface; 903. Second active part; 904. Second active friction surface; 10. Transmission slip ring; 1001. First transmission slip ring mating part; 1002. Second transmission slip ring mating part; 1003. First transmission slip ring friction surface; 1004. Second transmission slip ring friction surface; 1005. Third transmission slip ring friction surface Friction surface; 1006, fourth transmission slip ring friction surface; 1007, transmission slip ring vent; 11, driven scroll; 1101, first driven part; 1102, first driven friction surface; 1103, second driven part; 1104, second driven friction surface; 12, exhaust hollow shaft; 13, check valve; 14, compressor pressure stabilizing shell; 15, expander pressure stabilizing shell; 16, fixed bracket; a, expansion end high-pressure working medium channel; b, expansion end low-pressure working medium channel; c, low-pressure air intake channel; d, high-pressure exhaust channel. DETAILED DESCRIPTION

[0037] 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, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] The purpose of the present invention is to provide an energy recovery scroll compressor and a carbon dioxide heat pump system using the same, so as to solve the problems existing in the prior art. The scroll expansion mechanism is driven by a high-pressure working fluid to move, and the motor shaft of the driving mechanism is driven to move, thereby realizing the recovery and utilization of the pressure energy of the high-pressure working fluid, reducing the energy consumption of the driving mechanism itself, and improving the energy utilization rate.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Example 1:

[0041] Please refer to Figures 1 to 8, which provide an energy recovery type scroll compressor, including a scroll compression mechanism, a driving mechanism and a scroll expansion mechanism. Preferably, the scroll compression mechanism and the scroll expansion mechanism are both self-transforming scroll structures, one end of the motor shaft 703 of the driving mechanism is key-connected to the scroll compression mechanism, and the other end is key-connected to the scroll expansion mechanism. The scroll expansion mechanism includes a loaded scroll disk 5 and an unloaded scroll disk 3, the motor shaft 703 of the driving motor is transmission-connected to the loaded scroll disk 5, and the unloaded scroll disk 3 has an air intake hollow shaft 1 with an air intake hole centered at one end away from the loaded scroll disk 5, the air intake hole is connected to the high-pressure working medium channel a at the expansion end, and the expansion cavity of the scroll expansion mechanism is connected to the low-pressure working medium channel b at the expansion end. The high-pressure working fluid enters the vortex expansion mechanism through the air inlet, and the gas force drives the loaded scroll disk 5 and the unloaded scroll disk 3 to move together. The loaded scroll disk 5 and the motor shaft 703 are connected and transmitted by a flat key, driving the motor shaft 703 to rotate, replacing part of the motor to do work, that is, by delivering the high-pressure working fluid to the vortex expansion mechanism, the pressure energy of the high-pressure working fluid is converted into the rotation of the vortex expansion mechanism, and then driving the motor shaft 703 of the driving mechanism to rotate, which can reduce the self-energy consumption of the driving mechanism when driving the scroll compression mechanism to work, which is equivalent to combining the pressure energy with the electric energy of the driving motor to drive the scroll compression mechanism to move, thereby realizing the recovery of the pressure energy of the high-pressure working fluid, while reducing the power consumption of the driving mechanism itself and improving the energy utilization rate.

[0042] When the working fluid itself does not affect the normal operation of the structure inside the driving mechanism, and the temperature of the working fluid after expansion is lower than the temperature of the motor, the expansion cavity can be set to be connected to the inner cavity of the driving mechanism, and the low-pressure working fluid channel b at the expansion end is connected to the expansion cavity through the inner cavity of the driving mechanism. The working fluid after throttling expansion flows through the internal parts of the driving mechanism, taking away the heat generated by the internal parts when working, solving the cooling problem of the motor inside the driving mechanism and improving the service life of the motor. At the same time, there is no need to introduce external cooling equipment, saving energy.

[0043] In this embodiment, the scroll compression mechanism, the driving mechanism and the scroll expansion mechanism are arranged in sequence from top to bottom, and a fixing bracket 16 is provided at the bottom of the scroll expansion mechanism to reduce the horizontal space occupied.

[0044] The self-transforming scroll compression mechanism used in this embodiment includes a compressor pressure-stabilizing shell 14, an active scroll plate 9, a transmission slip ring 10 and a driven scroll plate 11. The compressor pressure-stabilizing shell 14 is arranged between one end of the driving mechanism and the driving mechanism to form a compression chamber. The active scroll plate 9, the transmission slip ring 10 and the driven scroll plate 11 are arranged in sequence in the compression chamber in the direction away from the driving mechanism. The active scroll plate 9 is connected to the motor shaft 703 of the driving mechanism through transmission. The active scroll plate 9 is connected to the driven scroll plate 11 through the transmission slip ring 10. The driven scroll plate An exhaust hollow shaft 12 is provided at one end of the disk 11 away from the active scroll 9. The exhaust hollow shaft 12 is connected to the high-pressure exhaust channel d, and the compression cavity is connected to the low-pressure intake channel c. The exhaust hollow shaft 12 is arranged in the compressor pressure stabilizing shell 14 through the compressor bearing seat. The phase difference between the active scroll 9 and the driven scroll 11 is 180°, ensuring that the cavity structure formed by the meshing of the scroll teeth of the active scroll 9 and the driven scroll 11 is always closed. There is a certain eccentricity between the active scroll 9 and the driven scroll 11. The eccentricity is the designed rotation radius of the scroll.

[0045] A first active friction surface 902 and a second active friction surface 904 are provided on opposite sides of the volute of the active scroll 9. A first active portion 901 in the form of a strip is provided radially on the first active friction surface 902, and a second active portion 903 in the form of a strip is provided radially on the second active friction surface 904. A first driven friction surface 1102 and a second driven friction surface 1104 are provided on opposite sides of the volute of the driven scroll 11. A first driven portion 1101 in the form of a strip is provided radially on the first driven friction surface 1102, and a second driven portion 1103 in the form of a strip is provided radially on the second driven friction surface 1104.

[0046] The transmission slip ring 10 is provided with two first transmission slip ring matching parts 1001 on the end surface close to the active scroll plate 9. The two first transmission slip ring matching parts 1001 match with the first active part 901 and the second active part 903 respectively. The two first transmission slip ring matching parts 1001 divide the end surface of the transmission slip ring 10 into a first transmission slip ring friction surface 1003 and a second transmission slip ring friction surface 1004. The first transmission slip ring friction surface 1003 contacts the first active friction surface 902, and the second transmission slip ring friction surface 1004 contacts the second active friction surface 904. The transmission slip ring 10 is provided with two second transmission slip ring matching parts 1002 on the end surface close to the driven scroll plate 11. The second transmission slip ring matching part 1002 matches with the first driven part 1101 and the second driven part 1103 respectively. The two second transmission slip ring matching parts 1002 divide the end face of the transmission slip ring 10 into a third transmission slip ring friction surface 1005 and a fourth transmission slip ring friction surface 1006. The third transmission slip ring friction surface 1005 contacts the first driven friction surface 1102, and the fourth transmission slip ring friction surface 1006 contacts the second driven friction surface 1104. The transmission slip ring 10 is axially provided with a plurality of transmission slip ring vents 1007 for connecting the inside and the outside. The gas in the compression chamber enters the working chamber of the active scroll 9 and the driven scroll 11 through the transmission slip ring vents 1007.

[0047] The compression chamber is divided into a working chamber and a pressure-stabilizing chamber by the bearing seat. The exhaust hollow shaft 12 is connected to the high-pressure exhaust channel d through the pressure-stabilizing chamber, and the low-pressure air intake channel c is connected to the working chamber. The bearing seat is located on the end face of the pressure-stabilizing chamber and is provided with a check valve 13 to prevent gas backflow. In this embodiment, the check valve 13 is a plate-like structure, which is covered on the exhaust hollow shaft 12 and one end is hinged to the bearing seat.

[0048] When the self-rotating scroll compressor of this embodiment is working, the active scroll 9 and the driven scroll 11 rotate around their respective central rotation axes at the same speed. There is a fixed eccentricity between the central rotation axis of the active scroll 9 and the central rotation axis of the driven scroll 11. The relative motion between the transmission slip ring 10 and the active scroll 9 and the driven scroll 11 is a linear translation in the direction of the first active part 901 or the second active part 903-the first transmission slip ring matching part 1001. The involved motion of the transmission slip ring 10 is the fixed rotation of the active scroll 9. Therefore, the absolute motion of the transmission slip ring 10 is the synthetic motion of the relative motion and the involved motion. When the active scroll 9 and the driven scroll 11 rotate at the same speed and fixed eccentricity, one scroll (active scroll 9) is used as the reference scroll, and the relative angular velocity of the other scroll (driven scroll 11) is always zero, while the direction of the eccentricity keeps changing, that is, the reference scroll (active scroll 9) is fixed and the other scroll (driven scroll 11) moves in translation around the fixed eccentricity, which is the same as the motion mode of the orbital scroll compressor.

[0049] The specific structure of the scroll expansion mechanism in this embodiment includes an expander pressure-stabilizing shell 15, a loaded scroll 5, a limiting slip ring 4 and an unloaded scroll 3. The expander pressure-stabilizing shell 15 is arranged between one end of the driving mechanism and the driving mechanism to form an expansion cavity. The loaded scroll 5, the limiting slip ring 4 and the unloaded scroll 3 are sequentially arranged in the expansion cavity in a direction away from the driving mechanism. The loaded scroll 5 is transmission-connected to the motor shaft 703 of the driving mechanism. The loaded scroll 5 is transmission-connected to the unloaded scroll 3 through the limiting slip ring 4. The phase difference between the loaded scroll 5 and the unloaded scroll 3 is 180°, ensuring that the cavity structure formed by the meshing of the scroll teeth of the loaded scroll 5 and the unloaded scroll 3 is always closed. There is a certain eccentricity between the loaded scroll 5 and the unloaded scroll 3, and the eccentricity is the designed rotation radius of the scroll.

[0050] A first loaded friction surface 502 and a second loaded friction surface 504 are provided on opposite sides of the volute of the loaded scroll 5. A first loaded portion 501 in the form of a strip is provided radially on the first loaded friction surface 502, and a second loaded portion 503 in the form of a strip is provided radially on the second loaded friction surface 504. A first unloaded friction surface 302 and a second unloaded friction surface 304 are provided on opposite sides of the volute of the unloaded scroll 3. A first unloaded portion 301 in the form of a strip is provided radially on the first unloaded friction surface 302, and a second unloaded portion 303 in the form of a strip is provided radially on the second unloaded friction surface 304.

[0051] The end surface of the limiting slip ring 4 close to the loaded scroll plate 5 is relatively provided with two first limiting slip ring matching parts 401, and the two first limiting slip ring matching parts 401 respectively cooperate with the first load part 501 and the second load part 503. The two first limiting slip ring matching parts 401 divide the end surface of the limiting slip ring 4 into a first limiting slip ring friction surface 403 and a second limiting slip ring friction surface 404. The first limiting slip ring friction surface 403 contacts the first load friction surface 502, and the second limiting slip ring friction surface 404 contacts the second load friction surface 504. The end surface of the limiting slip ring 4 close to the unloaded scroll plate 3 is relatively provided with two second limiting slip ring matching parts 402. The two second limiting slip rings The slip ring matching part 402 matches with the first no-load part 301 and the second no-load part 303 respectively. The two second limit slip ring matching parts 402 divide the end face of the limit slip ring 4 into a third limit slip ring friction surface 405 and a fourth limit slip ring friction surface 406. The third limit slip ring friction surface 405 contacts the first no-load friction surface 302, and the fourth limit slip ring friction surface 406 contacts the second no-load friction surface 304. The limit slip ring 4 is axially provided with a plurality of limit slip ring vents 407 for connecting the inside and the outside. The gas in the high-pressure working medium channel a at the expansion end enters the expansion cavity through the air inlet hollow shaft 1, the cavity between the vortex teeth, and the limit slip ring vents 407 in sequence.

[0052] The air intake hollow shaft 1 is arranged in the expansion cavity through the expansion bearing seat 2. The expansion cavity is divided into a working cavity and an air intake cavity by the expansion bearing seat 2. The air intake hollow shaft 1 is connected to the high-pressure working fluid channel a at the expansion end through the air intake cavity, and the low-pressure working fluid channel b at the expansion end is connected to the working cavity through the cavity of the driving mechanism.

[0053] The working principle of the scroll expansion mechanism is similar to that of the scroll compression mechanism, and the air intake direction changes, specifically: the loaded scroll disk 5 and the unloaded scroll disk 3 rotate around their respective central rotating axes at the same speed, and there is a fixed eccentricity between the central rotating axis of the loaded scroll disk 5 and the central rotating axis of the unloaded scroll disk 3. The relative motion between the limit slip ring 4 and the loaded scroll disk 5 and the unloaded scroll disk 3 is a linear translation in the direction of the first loaded part 501 or the second loaded part 503-the first limit slip ring matching part 401. The involved motion of the limit slip ring 4 is the fixed rotation of the loaded scroll disk 5, so the absolute motion of the limit slip ring 4 is the composite motion of the relative motion and the involved motion.

[0054] The first active part 901 and the second active part 903 are bosses, and the first transmission slip ring matching part 1001 is a slide groove; or the first active part 901 and the second active part 903 are slide grooves, and the first transmission slip ring matching part 1001 is a boss; the first driven part 1101 and the second driven part 1103 are bosses, and the second transmission slip ring matching part 1002 is a slide groove; or the first driven part 1101 and the second driven part 1103 are slide grooves, and the second transmission slip ring matching part 1002 is a slide groove. It is a boss; the first belt-carrying part 501 and the second belt-carrying part 503 are bosses, and the first position-limiting slip ring matching part 401 is a slide groove; or the first belt-carrying part 501 and the second belt-carrying part 503 are slide grooves, and the first position-limiting slip ring matching part 401 is a boss; the first empty part 301 and the second empty part 303 are bosses, and the second position-limiting slip ring matching part 402 is a slide groove; or the first empty part 301 and the second empty part 303 are slide grooves, and the second position-limiting slip ring matching part 402 is a boss.

[0055] The active scroll 9, the transmission slip ring 10, the driven scroll 11, the loaded scroll 5, the limiting slip ring 4 and the unloaded scroll 3 are all sprayed with a self-lubricating coating, which can effectively lubricate the active scroll 9, the driven scroll 11, the transmission slip ring 10 of the scroll compression mechanism and the loaded scroll 5, the unloaded scroll 3 and the limiting slip ring 4 of the scroll expansion mechanism, and the coating can reduce the meshing clearance between the active scroll 9 and the driven scroll 11 of the scroll compressor, reduce leakage and improve compression efficiency.

[0056] The driving structure specifically includes a motor housing 8, a motor stator 701, a motor rotor 702 and a motor shaft 703 arranged from the outside to the inside. The top and bottom of the motor housing 8 are respectively provided with a top bearing seat and a bottom bearing seat 6, and the two ends of the motor shaft 703 rotate in the two bearing seats.

[0057] Example 2:

[0058] This embodiment discloses an application embodiment of a carbon dioxide heat pump system with an energy recovery scroll compressor, wherein the high-pressure side working medium outlet of the regenerator of the carbon dioxide heat pump system is connected to the high-pressure working medium channel a of the expansion end, the working medium inlet of the evaporator of the carbon dioxide heat pump system is connected to the low-pressure working medium channel b of the expansion end, the low-pressure side working medium outlet of the regenerator of the carbon dioxide heat pump system is connected to the low-pressure air inlet channel c of the scroll compression mechanism, and the working medium inlet of the cooler of the carbon dioxide heat pump system is connected to the high-pressure exhaust channel d of the scroll compression mechanism.

[0059] Specifically, the high-pressure carbon dioxide working medium after passing through the cooler and the regenerator enters the scroll expansion mechanism through the high-pressure working medium channel a at the expansion end, enters the expansion chamber through the hollow air intake shaft of the scroll expansion mechanism to expand and perform work, and the expanded low-pressure carbon dioxide working medium flows through the motor to absorb heat and is discharged from the low-pressure working medium channel b at the expansion end to enter the evaporator. The carbon dioxide working medium that has passed through the evaporator and the regenerator enters the scroll compression mechanism through the low-pressure air intake channel c for compression, and the compressed carbon dioxide working medium is discharged through the high-pressure exhaust channel d into the cooler.

[0060] After the energy recovery scroll compressor is installed in the carbon dioxide heat pump system, it replaces the throttle valve. The motor temperature is higher than the air temperature outside the evaporator, the heat exchange efficiency through the motor is higher, and the overall heat exchange efficiency is improved. That is, the waste heat of the motor is recovered to improve the heat exchange efficiency, improve the system working efficiency, and reduce the overall unit energy consumption. Since the energy recovery scroll compressor adopts a vertical structure, the carbon dioxide working fluid is in a gas-liquid two-phase state after being expanded by the expander. Due to the density difference, the liquid carbon dioxide is at the bottom and the gaseous carbon dioxide is at the top, which can separate the carbon dioxide gas and liquid.

[0061] Adaptive changes based on actual needs are all within the scope of protection of the present invention.

[0062] It should be noted that it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be encompassed within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0063] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An energy recovery scroll compressor, It is characterized in that It includes a scroll compression mechanism, a driving mechanism and a scroll expansion mechanism, one end of the motor shaft of the driving mechanism is transmission-connected to the scroll compression mechanism, and the other end is transmission-connected to the scroll expansion mechanism, the scroll expansion mechanism includes a loaded scroll disk and an unloaded scroll disk, the motor shaft of the driving motor is transmission-connected to the loaded scroll disk, one end of the unloaded scroll disk away from the loaded scroll disk is an air intake hollow shaft with an air intake hole centrally provided, the air intake hole is connected to a high-pressure working fluid channel at the expansion end, and the expansion chamber of the scroll expansion mechanism is connected to a low-pressure working fluid channel at the expansion end.

2. The energy recovery scroll compressor according to claim 1, It is characterized in that The expansion cavity is communicated with the inner cavity of the driving mechanism, and the expansion-end low-pressure working medium passage is communicated with the expansion cavity through the inner cavity of the driving mechanism.

3. The energy recovery scroll compressor according to claim 1, It is characterized in that The scroll compression mechanism, the driving mechanism and the scroll expansion mechanism are arranged in sequence from top to bottom, and a fixing bracket is arranged at the bottom of the scroll expansion mechanism.

4. The energy recovery scroll compressor according to claim 1, It is characterized in that The scroll compression mechanism is a self-transforming scroll compression mechanism, and the scroll expansion mechanism is a self-transforming scroll expansion mechanism.

5. The energy recovery scroll compressor according to claim 4, It is characterized in that The scroll compression mechanism comprises a compressor pressure stabilizing shell, an active scroll, a transmission slip ring and a driven scroll, wherein the compressor pressure stabilizing shell is arranged between one end of the driving mechanism and the driving mechanism to form a compression chamber, the active scroll, the transmission slip ring and the driven scroll are arranged in sequence in the compression chamber in a direction away from the driving mechanism, the active scroll is transmission-connected to the motor shaft of the driving mechanism, the active scroll is transmission-connected to the driven scroll through the transmission slip ring, an exhaust hollow shaft is arranged at one end of the driven scroll away from the active scroll, the exhaust hollow shaft is communicated with a high-pressure exhaust passage, the compression chamber is communicated with a low-pressure intake passage, the exhaust hollow shaft is arranged in the compressor pressure stabilizing shell through a compressor bearing seat, and the phase difference between the active scroll and the driven scroll is 180°; The active scroll plate has a first active friction surface and a second active friction surface disposed opposite to each other on both sides of the spiral teeth. The first active friction surface has a first active portion in the form of a strip disposed radially. A second active portion in the form of a strip is arranged radially along the active friction surface, a first driven friction surface and a second driven friction surface are arranged oppositely on both sides of the spiral teeth of the driven scroll, a first driven portion in the form of a strip is arranged radially along the first driven friction surface, and a second driven portion in the form of a strip is arranged radially along the second driven friction surface; The end surface of the transmission slip ring close to the active scroll plate is relatively provided with two first transmission slip ring matching parts, the two first transmission slip ring matching parts respectively match with the first active part and the second active part, the two first transmission slip ring matching parts divide the end surface of the transmission slip ring into a first transmission slip ring friction surface and a second transmission slip ring friction surface, the first transmission slip ring friction surface contacts the first active friction surface, the second transmission slip ring friction surface contacts the second active friction surface, the end surface of the transmission slip ring close to the driven scroll plate is relatively provided with two second transmission slip ring matching parts, the two second transmission slip ring matching parts respectively match with the first driven part and the second driven part, the two second transmission slip ring matching parts divide the end surface of the transmission slip ring into a third transmission slip ring friction surface and a fourth transmission slip ring friction surface, the third transmission slip ring friction surface contacts the first driven friction surface, the fourth transmission slip ring friction surface contacts the second driven friction surface, and the transmission slip ring is radially provided with a plurality of transmission slip ring vents for connecting the inside and the outside.

6. The energy recovery scroll compressor according to claim 5, It is characterized in that The active scroll, the transmission slip ring and the driven scroll are all sprayed with a self-lubricating coating.

7. The energy recovery scroll compressor according to claim 5, It is characterized in that The compression chamber is divided into a working chamber and a pressure stabilizing chamber by a bearing seat. The exhaust hollow shaft is connected to the high-pressure exhaust channel through the pressure stabilizing chamber, and the low-pressure intake channel is connected to the working chamber. A check valve is provided on the end face of the pressure stabilizing chamber to prevent gas backflow.

8. The energy recovery scroll compressor according to claim 4, It is characterized in that The scroll expansion mechanism comprises an expander pressure-stabilizing shell, a loaded scroll disk, a limiting slip ring and an unloaded scroll disk, wherein the expander pressure-stabilizing shell is arranged between one end of the driving mechanism and the driving mechanism to form the expansion cavity, the loaded scroll disk, the limiting slip ring and the unloaded scroll disk are sequentially arranged in the expansion cavity in a direction away from the driving mechanism, the loaded scroll disk is drivingly connected to the motor shaft of the driving mechanism, the loaded scroll disk is drivingly connected to the unloaded scroll disk through the limiting slip ring, and the phase difference between the loaded scroll disk and the unloaded scroll disk is 180°; A first loaded friction surface and a second loaded friction surface are disposed oppositely on both sides of the volute of the loaded scroll, a first loaded portion in the form of a strip is disposed radially on the upper side of the first loaded friction surface, a second loaded portion in the form of a strip is disposed radially on the upper side of the second loaded friction surface, and a first unloaded friction surface and a second unloaded friction surface are disposed oppositely on both sides of the volute of the unloaded scroll, a first unloaded portion in the form of a strip is disposed radially on the upper side of the first unloaded friction surface, a second unloaded portion in the form of a strip is disposed radially on the upper side of the second unloaded friction surface; The end surface of the limit slip ring close to the loaded scroll plate is relatively provided with two first limit slip ring matching parts, the two first limit slip ring matching parts respectively match with the first load part and the second load part, the two first limit slip ring matching parts divide the end surface of the limit slip ring into a first limit slip ring friction surface and a second limit slip ring friction surface, the first limit slip ring friction surface contacts with the first load friction surface, the second limit slip ring friction surface contacts with the second load friction surface, the limit slip ring close to the unloaded scroll plate Two second limit slip ring matching parts are arranged opposite to the end surface of the limit slip ring, and the two second limit slip ring matching parts respectively match with the first no-load part and the second no-load part. The two second limit slip ring matching parts divide the end surface of the limit slip ring into a third limit slip ring friction surface and a fourth limit slip ring friction surface. The third limit slip ring friction surface contacts the first no-load friction surface, and the fourth limit slip ring friction surface contacts the second no-load friction surface. The limit slip ring is radially opened with a plurality of limit slip ring vents for connecting the inside and the outside.

9. The energy recovery scroll compressor according to claim 8, It is characterized in that The loaded scroll, the limiting slip ring and the unloaded scroll are all sprayed with a self-lubricating coating.

10. A carbon dioxide heat pump system using the energy recovery scroll compressor according to any one of claims 1 to 9, It is characterized in that The high-pressure side working medium outlet of the regenerator of the carbon dioxide heat pump system is connected to the high-pressure working medium channel of the expansion end, the working medium inlet of the evaporator of the carbon dioxide heat pump system is connected to the low-pressure working medium channel of the expansion end, the low-pressure side working medium outlet of the regenerator of the carbon dioxide heat pump system is connected to the low-pressure air intake channel of the scroll compression mechanism, and the working medium inlet of the cooler of the carbon dioxide heat pump system is connected to the high-pressure exhaust channel of the scroll compression mechanism.

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