Energy recovery scroll compressor and carbon dioxide heat pump system using it

Abstract

The present invention relates to an energy recovery scroll compressor and a carbon dioxide heat pump system using the same, which relates to the technical field of compressors. The system includes a scroll compression mechanism, a drive mechanism, and a scroll expansion mechanism. One end of the drive mechanism's motor shaft is drivingly connected to the scroll compression mechanism and the other end is drivingly connected to the scroll expansion mechanism. The drive motor's motor shaft is drivingly connected to the load scroll of the scroll expansion mechanism. One end of the idle scroll of the scroll expansion mechanism, away from the load scroll, is an air inlet hollow shaft, the air inlet hole is connected to the expansion end high-pressure working medium passage, and the expansion cavity of the scroll expansion mechanism is connected to the expansion end low-pressure working medium passage. In the present invention, the scroll expansion mechanism uses the pressure energy of the high-pressure working medium to rotate the motor shaft of the drive mechanism, and combines the pressure energy with the electrical energy of the drive motor to recover the pressure energy of the high-pressure working medium. At the same time, the power consumption of the drive mechanism itself is reduced, improving energy utilization rate.

Description

[Technical Field]

[0001] The present invention relates to the technical field of compressors, and more particularly to an energy recovery scroll compressor and a carbon dioxide heat pump system to which the same is applied. [Background technology]

[0002] Scroll compressors have advantages such as a simple structure, smooth operation, low noise, high mechanical efficiency, and high volumetric efficiency, and are widely used in various fields, including industry and daily life. The movable and fixed scrolls of a scroll compressor are arranged opposite each other at an angle of 180 degrees and are assembled with a fixed orbital radius offset. The movable scroll is driven by a crankshaft whose orbital radius is the same as its eccentric radius, achieving orbital and translational movement. As the movable scroll moves, it meshes with the fixed scroll, forming several pairs of crescent-shaped sealed working cavities with continuously changing volume. From the inside to the outside, these are the first compression cavity (central cavity), second compression cavity, and third compression cavity (intake cavity). When the compressor is operating, the volume of the compression cavities changes according to the rotation angle of the main shaft. When compression is complete, the second compression cavity and the central cavity connect, and gas is discharged through the exhaust port. The working medium undergoes three processes: intake, compression, and exhaust in the crescent-shaped working cavities.

[0003] Scroll compressors are widely used in the field of heat pump air conditioning, and supercritical carbon dioxide circulation heat pumps are widely developed and applied as a new technology that achieves high efficiency, energy saving, and environmental protection because they do not pollute or damage the environment, have stable system operation, are compact, and have high energy efficiency.However, because supercritical carbon dioxide circulation heat pumps have high operating pressures, the throttling pressure difference between the high-pressure side and the low-pressure side can reach 6 to 8 MPa, and therefore supercritical carbon dioxide circulation heat pumps still have the problem of large throttling losses.

[0004] Therefore, there is an urgent need for an energy recovery scroll compressor that can recover throttling energy, reduce energy consumption, and improve energy utilization rate. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to provide an energy recovery scroll compressor and a carbon dioxide heat pump system to which the same is applied, which utilizes a high-pressure working medium to drive a scroll expansion mechanism, which in turn drives a motor shaft of a drive mechanism, thereby recovering and utilizing the pressure energy of the high-pressure working medium, thereby reducing the energy consumption of the drive mechanism itself and improving energy utilization rate. [Means for solving the problem]

[0006] In order to achieve the above object, 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 drive mechanism and a scroll expansion mechanism, one end of a motor shaft of the drive mechanism is drivingly connected to the scroll compression mechanism and the other end is drivingly connected to the scroll expansion mechanism, the scroll expansion mechanism includes a load scroll and an idle scroll, the motor shaft of the drive motor is drivingly connected to the load scroll, and one end of the idle scroll remote from the load scroll is provided with an air inlet hollow shaft having an air inlet hole at its center, the air inlet hole communicating with an expansion end high-pressure working medium passage, and the expansion cavity of the scroll expansion mechanism is communicating with an expansion end low-pressure working medium passage.

[0007] Preferably, the expansion cavity communicates with an internal cavity of the drive mechanism, and the expansion-end low-pressure working medium passage communicates with the expansion cavity via the internal cavity of the drive mechanism.

[0008] Preferably, the scroll compression mechanism, the drive mechanism, and the scroll expansion mechanism are arranged in this order from top to bottom, and a fixing bracket is provided at the bottom of the scroll expansion mechanism.

[0009] Preferably, the scroll compression mechanism is a rotary scroll compression mechanism, and the scroll expansion mechanism is a rotary scroll expansion mechanism.

[0010] Preferably, the scroll compression mechanism includes a compressor regulator housing, a driving scroll, a transmission slip ring, and a driven scroll, the compressor regulator housing being disposed between one end of the drive mechanism and the drive mechanism to form a compression cavity, the driving scroll, the transmission slip ring, and the driven scroll being disposed in the compression cavity in that order in a direction away from the drive mechanism, the driving scroll being drivingly connected to a motor shaft of the drive mechanism, and the driving scroll being drivingly connected to the driven scroll via the transmission slip ring, an exhaust hollow shaft being disposed at one end of the driven scroll remote from the driving scroll, the exhaust hollow shaft communicating with a high-pressure exhaust passage, and the compression cavity communicating with a low-pressure air inlet passage, the exhaust hollow shaft being disposed in the compressor regulator housing via a bearing seat of the compressor, and a phase difference between the driving scroll and the driven scroll being 180°,

[0011] A first driving friction surface and a second driving friction surface are disposed opposite to each other on both sides of the scroll teeth of the driving scroll, a band-shaped first driving portion is disposed on the first driving friction surface along the radial direction, a band-shaped second driving portion is disposed on the second driving friction surface along the radial direction, and a first driven friction surface and a second driven friction surface are disposed opposite to each other on both sides of the scroll teeth of the driven scroll, a band-shaped first driven portion is disposed on the first driven friction surface along the radial direction, and a band-shaped second driven portion is disposed on the second driven friction surface along the radial direction,

[0012] Two first transmission slip ring fitting portions are installed opposite to each other on an end surface of the transmission slip ring close to the driven scroll, and the two first transmission slip ring fitting portions are fitted with the first driving part and the second driving part, respectively. The two first transmission slip ring fitting portions 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, and the first transmission slip ring friction surface contacts the first driving friction surface, and the second transmission slip ring friction surface contacts the second driving friction surface. Two second transmission slip ring fitting portions are installed opposite to each other on the lower end surface of the slip ring, and the two second transmission slip ring fitting portions are fitted with the first driven portion and the second driven portion, respectively. The two second transmission slip ring fitting portions divide the end surface of the slip ring into a third transmission slip ring friction surface and a fourth transmission slip ring friction surface, and 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 slip ring is provided with a plurality of radial transmission slip ring vent holes connecting the inside and outside.

[0013] Preferably, the driving scroll, the transmission slip ring, and the driven scroll are all sprayed with a self-lubricating coating.

[0014] Preferably, the compression cavity is divided into a working cavity and a regulator cavity by a bearing seat, the exhaust hollow shaft communicates with the high-pressure exhaust passage through the regulator cavity, the low-pressure air inlet passage communicates with the working cavity, and a check valve is installed on the end face of the bearing seat located in the regulator cavity to prevent backflow of gas.

[0015] Preferably, the scroll expansion mechanism includes an expander regulator housing, a load scroll, a limit slip ring, and an idle scroll, an expansion cavity is formed between one end of the expander regulator housing installed in the drive mechanism and the drive mechanism, the load scroll, the limit slip ring, and the idle scroll are sequentially arranged in the expansion cavity along a direction away from the drive mechanism, the load scroll is drivingly connected to a motor shaft of the drive mechanism, and the load scroll is drivingly connected to the idle scroll via the limit slip ring, and a phase difference between the load scroll and the idle scroll is 180°,

[0016] a first loaded friction surface and a second loaded friction surface are disposed opposite each other on both sides of the scroll tooth of the load scroll, a band-shaped first loaded portion is provided on the first loaded friction surface along the radial direction, a band-shaped second loaded portion is provided on the second loaded friction surface along the radial direction, a first idle friction surface and a second idle friction surface are disposed opposite each other on both sides of the scroll tooth of the idle scroll, a band-shaped first idle portion is provided on the first idle friction surface along the radial direction, and a band-shaped second idle portion is provided on the second idle friction surface along the radial direction,

[0017] Two first limit slip ring fitting portions are provided on an end surface of the limit slip ring close to the load scroll, and the two first limit slip ring fitting portions are fitted with the first load portion and the second load portion, respectively, and the two first limit slip ring fitting portions divide the end surface of the limit slip ring into the first limit slip ring friction surface and the second limit slip ring friction surface, the first limit slip ring friction surface contacts the first load friction surface, and the second limit slip ring friction surface contacts the second load friction surface, and the end surface of the limit slip ring close to the idle scroll is provided with: Two second limit slip ring fitting portions are provided, and the two second limit slip ring fitting portions are fitted with the first idle portion and the second idle portion, respectively. The two second limit slip ring fitting portions divide the end face of the limit slip ring into the third limit slip ring friction surface and the fourth limit slip ring friction surface, the third limit slip ring friction surface contacts the first idle friction surface, and the fourth limit slip ring friction surface contacts the second idle friction surface. Several limit slip ring vent holes are provided in the radial direction of the limit slip ring to connect the inside and outside.

[0018] Preferably, the load scroll, the limit slip ring, and the idler scroll are all sprayed with a self-lubricating coating.

[0019] The present invention further provides a carbon dioxide heat pump system using 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 expansion end high-pressure working medium passage, the evaporator working medium inlet of the carbon dioxide heat pump system is connected to the expansion end low-pressure working medium passage, 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 passage 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 passage of the scroll compression mechanism. [Effects of the Invention]

[0020] Compared with the prior art, the present invention mainly achieves the following technical advantages: When the high-pressure working medium is transported to the scroll expansion mechanism, the pressure energy of the high-pressure working medium is converted into rotation of the scroll expansion mechanism, which rotates the motor shaft of the drive mechanism and reduces the energy consumption of the drive mechanism when driving the scroll compression mechanism. This is equivalent to combining the pressure energy and the electrical energy of the drive motor to drive and operate the scroll compression mechanism, which recovers the pressure energy of the high-pressure working medium and, at the same time, reduces the power consumption of the drive mechanism itself and improves energy utilization rate.

[0021] The other solution of the present invention achieves the following technical advantages compared with the existing technology: This device can replace a throttle valve, allowing the high-pressure working medium to flow after throttling and expansion into the motor, absorbing the heat generated by the motor and solving the problem of cooling the motor. When this device is used in a carbon dioxide heat pump, the motor temperature is higher than the external air temperature of the evaporator, improving the heat exchange efficiency through the motor and the overall heat exchange efficiency. In other words, the waste heat of the motor is recovered to improve the heat exchange efficiency, improving system efficiency and reducing the energy consumption of the entire mechanical unit.

[0022] This device has a vertical structure with the scroll compressor located above the motor and the scroll expander located below the motor.When this device is used in a carbon dioxide heat pump, the carbon dioxide working medium expands in the expander and becomes a two-phase gas-liquid state.Due to the difference in density, liquid carbon dioxide is at the bottom and gas carbon dioxide is at the top, and the carbon dioxide can be separated into gas and liquid.

[0023] A self-lubricating coating is used, which can effectively lubricate the driving scroll, driven scroll, and transmission slip ring of the scroll compression mechanism, and the load scroll, idle scroll, and limit slip ring of the scroll expansion mechanism. The coating can also reduce the meshing gap between the driving scroll and driven scroll of the scroll compressor, reduce leakage, and improve compression efficiency. [Brief explanation of the drawings]

[0024] In order to more clearly describe the embodiments of the present invention or the technical solutions of the prior art, the drawings that need to be used in the embodiments are briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative efforts. [Figure 1] 1 is a schematic diagram showing the external structure of an energy recovery scroll compressor according to the present invention; [Figure 2] FIG. 2 is a schematic cross-sectional view of the arrow portion in FIG. [Figure 3] FIG. 2 is a structural schematic diagram of the driving scroll of the present invention. [Figure 4] FIG. 2 is a structural schematic diagram of the driven scroll of the present invention. [Figure 5] 1 is a structural schematic diagram of a transmission slip ring according to the present invention; [Figure 6] 1 is a structural schematic diagram of a load scroll of the present invention; [Figure 7] 1 is a structural schematic diagram of an idle scroll of the present invention; [Figure 8] 1 is a structural schematic diagram of a limit slip ring of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0025] The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0026] In order to solve the problems existing in the existing technology, the object of the present invention is to provide an energy recovery scroll compressor and a carbon dioxide heat pump system to which the same is applied, which utilize a high-pressure working medium to drive a scroll expansion mechanism, which in turn drives and moves a motor shaft of a drive mechanism, thereby recovering and utilizing the pressure energy of the high-pressure working medium, thereby reducing the energy consumption of the drive mechanism itself and improving energy utilization rate.

[0027] In order to make the above objects, features and advantages of the present invention more clear and understandable, the present invention will be described in more detail below with reference to the drawings and specific embodiments. [Example]

[0028] 1 to 8, an energy recovery scroll compressor is provided, which includes a scroll compression mechanism, a driving mechanism, and a scroll expansion mechanism. Preferably, the scroll compression mechanism and the scroll expansion mechanism are both of a rotary scroll structure. One end of the driving mechanism's motor shaft 703 is key-driven connected to the scroll compression mechanism, and the other end is key-driven connected to the scroll expansion mechanism. The scroll expansion mechanism includes a load scroll 5 and an idle scroll 3. The driving motor's motor shaft 703 is drivingly connected to the load scroll 5. An air inlet hollow shaft 1 is provided with an air inlet hole at one end of the idle scroll 3 remote from the load scroll 5, the air inlet hole communicates with the expansion end high-pressure working medium passage a. The expansion cavity of the scroll expansion mechanism communicates with the expansion end low-pressure working medium passage b. The high-pressure working medium flows through the air inlet. The gas enters the scroll expansion mechanism, and the force of the gas drives the load scroll 5 and the idle scroll 3 to move together. The load scroll 5 is connected to the motor shaft 703 with a flat key, which rotates the motor shaft 703 and replaces part of the motor's operation. That is, the high-pressure working medium is transported to the scroll expansion mechanism, and the pressure energy of the high-pressure working medium is converted into the rotation of the scroll expansion mechanism, which in turn rotates the motor shaft 703 and drives the scroll compression mechanism, thereby reducing the energy consumption of the drive mechanism itself during operation. This is equivalent to combining the pressure energy and the electrical energy of the drive motor to drive the movement of the scroll compression mechanism, which realizes the recovery of the pressure energy of the high-pressure working medium, reduces the power consumption of the drive mechanism itself, and improves energy utilization rate.

[0029] If the working medium itself does not affect the normal operation of the structures within the drive mechanism, and the temperature of the working medium after expansion is lower than that of the motor, the expansion cavity can be configured to communicate with the internal cavity of the drive mechanism, and the low-pressure working medium flow path b at the expansion end communicates with the expansion internal cavity through the internal cavity of the drive mechanism, so that the throttling and expanded working medium flows through the internal components of the drive mechanism to absorb the heat generated during the operation of the internal components, thereby solving the cooling problem of the motor within the drive mechanism and improving the life of the motor. At the same time, there is no need to install an external cooling device, which saves energy.

[0030] In this embodiment, the scroll compression mechanism, the drive mechanism, and the scroll expansion mechanism are arranged in this order 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.

[0031] The rotary scroll compression mechanism used in this embodiment includes a compressor regulator housing 14, a driving scroll 9, a transmission slip ring 10, and a driven scroll 11. The compressor regulator housing 14 is disposed between one end of the drive mechanism and the drive mechanism to form a compression cavity. The driving scroll 9, the transmission slip ring 10, and the driven scroll 11 are disposed in the compression cavity in order in a direction away from the drive mechanism. The driving scroll 9 is drivingly connected to the motor shaft 703 of the drive mechanism. The driving scroll 9 is drivingly connected to the driven scroll 11 via the transmission slip ring 10. An exhaust hollow shaft 12 is installed at one end of the roll 11 away from the driving scroll 9, the exhaust hollow shaft 12 communicates with the high-pressure exhaust passage d, and the compression cavity communicates with the low-pressure air inlet passage c. The exhaust hollow shaft 12 is disposed in the compressor regulator housing 14 through the compressor bearing seat. The phase difference between the driving scroll 9 and the driven scroll 11 is 180°, so that the cavity structure formed by the meshing of the scroll teeth of the driving scroll 9 and the driven scroll 11 is always closed. There is a certain eccentric distance between the driving scroll 9 and the driven scroll 11, and this eccentric distance is guaranteed to be the design rotation radius of the scroll.

[0032] A first driving friction surface 902 and a second driving friction surface 904 are disposed opposite each other on both sides of the scroll teeth of the driving scroll 9, a band-shaped first driving portion 901 is disposed on the first driving friction surface 902 along the radial direction, and a band-shaped second driving portion 903 is disposed on the second driving friction surface 904 along the radial direction, and a first driven friction surface 1102 and a second driven friction surface 1104 are disposed opposite each other on both sides of the scroll teeth of the driven scroll 11, a band-shaped first driven portion 1101 is disposed on the first driven friction surface 1102 along the radial direction, and a band-shaped second driven portion 1103 is disposed on the second driven friction surface 1104 along the radial direction,

[0033] Two first transmission slip ring 1001 fitting portions are installed opposite to each other on the end face of the transmission slip ring 10 near the driving scroll 9, and the two first transmission slip ring fitting portions 1001 are fitted respectively with the first driving portion 901 and the second driving portion 903. The two first transmission slip ring fitting portions 1001 divide the end face 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 driving friction surface 902, and the second transmission slip ring friction surface 1004 contacts the second driving friction surface 904. Two second transmission slip ring fitting portions 1002 are installed opposite to each other on the end face of the transmission slip ring 10 near the driven scroll 11. The two second transmission slip ring fitting portions 1002 respectively fit with the first driven portion 1101 and the second driven portion 1103. The two second transmission slip ring fitting portions 1002 divide the end faces 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. A plurality of transmission slip ring vent holes 1007 connecting the inside and outside are provided radially of the transmission slip ring 10. Gas in the compression cavity flows through the transmission slip ring vent holes 1007 into the working cavities of the driving scroll 9 and the driven scroll 11.

[0034] The compression cavity is divided into a working cavity and a regulator cavity by the bearing seat, the exhaust hollow shaft 12 communicates with the high-pressure exhaust passage d through the regulator cavity, and the low-pressure air inlet passage c communicates with the working cavity, and a check valve 13 is installed on the end face of the bearing seat located at the regulator cavity to prevent gas from flowing back. In this embodiment, the check valve 13 has a plate-like structure, which is installed to cover the exhaust hollow shaft 12, and one end of the plate-like structure is installed on the bearing seat by a hinge connection.

[0035] When the rotary scroll compressor of this embodiment is in operation, the driving scroll 9 and the driven scroll 11 rotate at the same rotation speed around their respective central rotation axes, and there is a fixed eccentric distance between the central rotation axis of the driving scroll 9 and the central rotation axis of the driven scroll 11. The relative movement between the transmission slip ring 10 and the driving scroll 9 or the driven scroll 11 is a linear translation movement from the first driving part 901 or the second driving part 903 to the first transmission slip ring fitting part 1001. The associated movement of the transmission slip ring 10 is a fixed rotation of the driving scroll 9, so the transmission The absolute movement of the moving slip ring 10 is a combination of relative movement and linked movement. When the driving scroll 9 and the driven scroll 11 rotate at the same rotational speed and a fixed eccentric distance, if one scroll (driving scroll 9) is used as the reference scroll, the relative angular velocity of the other scroll (driven scroll 11) is always 0, and the direction of the eccentric distance is always changing. In other words, the reference scroll (driving scroll 9) is fixed, and the other scroll (driven scroll 11) moves in a translational manner around a fixed eccentric distance, which is the same as the movement method of an orbital scroll compressor.

[0036] The specific configuration of the scroll expansion mechanism in this embodiment includes an expander regulator housing 15, a load scroll 5, a limit slip ring 4, and an idle scroll 3. An expansion cavity is formed between one end of the expander regulator housing 15 installed in the drive mechanism and the drive mechanism. In the expansion cavity, the load scroll 5, the limit slip ring 4, and the idle scroll 3 are sequentially arranged along a direction away from the drive mechanism. The load scroll 5 is drivingly connected to the motor shaft 703 of the drive mechanism, and the load scroll 5 is drivingly connected to the idle scroll 3 via the limit slip ring 4. The phase difference between the load scroll 5 and the idle scroll 3 is 180°, so that the cavity structure formed by the meshing of the scroll teeth of the load scroll 5 and the idle scroll 3 is always closed. There is a certain eccentricity between the load scroll 5 and the idle scroll 3, and this eccentricity is guaranteed to be the design rotation radius of the scroll.

[0037] A first loaded friction surface 502 and a second loaded friction surface 504 are arranged opposite each other on both sides of the scroll tooth of the load scroll 5, a band-shaped first loaded portion 501 is provided on the first loaded friction surface 502 along the radial direction, and a band-shaped second loaded portion 503 is provided on the second loaded friction surface 504 along the radial direction, and a first idle friction surface 302 and a second idle friction surface 304 are arranged opposite each other on both sides of the scroll tooth of the idle scroll 3, a band-shaped first idle portion 301 is provided on the first idle friction surface 302 along the radial direction, and a band-shaped second idle portion 303 is provided on the second idle friction surface 304 along the radial direction,

[0038] Two first limit slip ring fitting portions 401 are provided on the end face of the limit slip ring 4 close to the load scroll 5, and the two first limit slip ring fitting portions 401 are fitted with a first load portion 501 and a second load portion 503, respectively. The two first limit slip ring fitting portions 401 divide the end face of the limit slip ring 4 into a first limit slip ring friction surface 403 and a second limit slip ring friction surface 404, and the first limit slip ring friction surface 403 contacts the first load friction surface 502, and the second limit slip ring friction surface 404 contacts the second load friction surface 504. Two second limit slip ring fitting portions 402 are provided on the end face of the limit slip ring 4 close to the idle scroll 3, and the two second limit slip The ring fitting portion 402 fits into the first idle portion 301 and the second idle portion 303, respectively. The two second limit slip ring fitting portions 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 idle friction surface 302, and the fourth limit slip ring friction surface 406 contacts the second idle friction surface 304. Several limit slip ring vents 407 are provided in the axial direction of the limit slip ring 4 to connect the inside and outside. The gas in the expansion end high-pressure working medium passage a flows sequentially through the air inlet hollow shaft 1, the cavity between the scroll teeth, and the limit slip ring vents 407 into the expansion cavity.

[0039] The air inlet hollow shaft 1 is installed in the expansion cavity via the expander bearing seat 2, and the expansion cavity is divided into a working cavity and an air inlet cavity by the expander bearing seat 2. The air inlet hollow shaft 1 communicates with the high-pressure working medium passage a at the expansion end via the air inlet cavity, and the low-pressure working medium passage b at the expansion end communicates with the working cavity via the cavity of the drive mechanism.

[0040] The operating principle of the scroll expansion mechanism is the same as that of the scroll compression mechanism, except that the direction of the air inlet changes. Specifically, the load scroll 5 and the idle scroll 3 rotate at the same rotational speed around their respective central rotation axes. There is a fixed eccentricity between the central rotation axis of the load scroll 5 and the central rotation axis of the idle scroll 3. The relative movement between the limit slip ring 4 and the load scroll 5 / idle scroll 3 is a linear translation movement from the first load section 501 or the second load section 503 toward the first limit slip ring fitting section 401. The linked movement of the limit slip ring 4 is the fixed rotation of the load scroll 5, so the absolute movement of the limit slip ring 4 is a combination of relative movement and linked movement.

[0041] The first driving part 901 and the second driving part 903 are bosses, and the first transmission slip ring fitting part 1001 is a slide groove; alternatively, the first driving part 901 and the second driving part 903 are slide grooves, and the first transmission slip ring fitting part 1001 is a boss, and the first driven part 1101 and the second driven part 1103 are bosses, and the second transmission slip ring fitting part 1002 is a slide groove; alternatively, the first driven part 1101 and the second driven part 1103 are slide grooves, and the second transmission slip ring fitting part 1002 is a boss; The first load portion 501 and the second load portion 503 are bosses, and the first limit slip ring fitting portion 401 is a slide groove; alternatively, the first load portion 501 and the second load portion 503 are slide grooves and the first limit slip ring fitting portion 401 is a boss, the first idle portion 301 and the second idle portion 303 are bosses, and the second limit slip ring fitting portion 402 is a slide groove; alternatively, the first idle portion 301 and the second idle portion 303 are slide grooves and the second limit slip ring fitting portion 402 is a boss.

[0042] The driving scroll 9, the transmission slip ring 10, the driven scroll 11, the load scroll 5, the limit slip ring 4 and the idle scroll 3 are all sprayed with a self-lubricating coating, which can effectively lubricate the driving scroll 9, the driven scroll 11 and the transmission slip ring 10 of the scroll compression mechanism and the load scroll 5, the idle scroll 3 and the limit slip ring 4 of the scroll expansion mechanism. Furthermore, the coating reduces the meshing gap between the driving scroll 9 and the driven scroll 11 of the scroll compressor, reduces leakage and improves compression efficiency.

[0043] Specifically, the drive structure is such that the motor housing 8, motor stator 701, motor rotor 702, and motor shaft 703 are arranged from the outside to the inside, and top and bottom bearing seats 6 are provided at the top and bottom of the motor housing 8, respectively, and both ends of the motor shaft 703 rotate within the two bearing seats. [Example]

[0044] This embodiment discloses a carbon dioxide heat pump system that uses an energy recovery scroll compressor, in which the high-pressure side working medium outlet of the regenerator of the carbon dioxide heat pump system is connected to the expansion end high-pressure working medium passage a, the evaporator working medium inlet of the carbon dioxide heat pump system is connected to the expansion end low-pressure working medium passage b, 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 passage 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 passage d of the scroll compression mechanism.

[0045] Specifically, the high-pressure carbon dioxide working medium passes through the cooler and regenerator and flows into the scroll expansion mechanism through the expansion end high-pressure working medium passage a, enters the expansion cavity from the hollow air inlet shaft of the scroll expansion mechanism and expands to perform work, the expanded low-pressure carbon dioxide working medium flows through the motor to absorb heat and is discharged from the expansion end low-pressure working medium passage b and enters the evaporator, the carbon dioxide working medium that has passed through the evaporator and regenerator enters the scroll compression mechanism through the low-pressure air inlet passage c and is compressed, and the compressed carbon dioxide working medium is discharged through the high-pressure exhaust passage d and enters the cooler.

[0046] After being installed in a carbon dioxide heat pump system, the energy recovery scroll compressor replaces the throttle valve, and the motor temperature is higher than the external air temperature of the evaporator, resulting in high heat exchange efficiency via the motor and improved overall heat exchange efficiency. This means that the waste heat of the motor is recovered to improve heat exchange efficiency, thereby improving system efficiency and reducing the energy consumption of the entire mechanical unit. Because the energy recovery scroll compressor has a vertical structure, the working medium of carbon dioxide expanded by the expander becomes a two-phase gas-liquid state, and due to the difference in density, liquid carbon dioxide is at the bottom and gas carbon dioxide is at the top, allowing the carbon dioxide to be separated into gas and liquid.

[0047] Any adaptive changes based on actual needs are within the scope of the present invention.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the illustrative examples set forth above, and furthermore, the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof, and therefore, the examples are to be considered in all respects as illustrative and not limiting, the scope of the present invention being defined by the claims rather than the foregoing description, and it should be noted that all changes that come within the meaning and range of equivalency of the claims are therefore embraced within the present invention.

[0049] The present invention uses specific examples to explain the principles and implementation methods of the present invention, but the description of the above examples is only used to understand the method of the present invention and its core concept, and at the same time, those skilled in the art will make changes to the specific implementation and application scope based on the concept of the present invention. In summary, the contents of this specification should not be interpreted as limiting the present invention. [Explanation of symbols]

[0050] 1.Air inlet hollow shaft, 2.Expander bearing seat, 3. Idle Scroll, 301. First Idol Section, 302. First idle friction surface, 303. Second Idol Section, 304. Second idle friction surface, 4. Limit slip ring, 401. First limit slip ring fitting, 402. Second limit slip ring fitting, 403. First limit slip ring friction surface, 404. Second limit slip ring friction surface, 405. Third limit slip ring friction surface, 406.Fourth limit slip ring friction surface, 407. Limit slip ring vent, 5. Load scroll, 501. 1st load section, 502.First load friction surface, 503.Second load section, 504.Second load friction surface, 6.Bottom bearing seat 701. Motor stator, 702. Motor rotor, 703. Motor shaft, 8.Motor housing, 9. Active scrolling, 901.1st moving part, 902.First active friction surface, 903.Second active part, 904.Second active friction surface, 10. Transmission slip ring, 1001. First transmission slip ring fitting, 1002. Second transmission slip ring fitting, 1003. First transmission slip ring friction surface; 1004. Second transmission slip ring friction surface; 1005. Third transmission slip ring friction surface 1006. Fourth transmission slip ring friction surface, 1007. Transmission slip ring vent, 11. Follower 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 regulator housing, 15.Expander regulator housing, 16. Fixing bracket, a. Expansion end high pressure working medium passage; b. Expansion end low-pressure working medium passage; c. Low pressure air inlet passage, d.High pressure exhaust passage.

Claims

1. 1. An energy recovery scroll compressor comprising: a scroll compression mechanism, a drive mechanism, and a scroll expansion mechanism, wherein one end of a motor shaft of the drive mechanism is drivingly connected to the scroll compression mechanism and the other end is drivingly connected to the scroll expansion mechanism, the scroll expansion mechanism includes a load scroll and an idle scroll, the motor shaft of the drive motor is drivingly connected to the load scroll, the idle scroll has an air inlet hollow shaft with an air inlet hole at its center at one end remote from the load scroll, the air inlet hole communicates with an expansion-end high-pressure working medium passage, and the expansion cavity of the scroll expansion mechanism communicates with an expansion-end low-pressure working medium passage.

2. 2. The energy recovery scroll compressor according to claim 1, wherein the expansion cavity communicates with an internal cavity of the drive mechanism, and the expansion-end low-pressure working medium passage communicates with the expansion cavity via the internal cavity of the drive mechanism.

3. 2. The energy recovery scroll compressor according to claim 1, wherein the scroll compression mechanism, the drive mechanism, and the scroll expansion mechanism are arranged in this order from top to bottom, and a fixing bracket is provided at the bottom of the scroll expansion mechanism.

4. 2. The energy recovery scroll compressor according to claim 1, wherein the scroll compression mechanism is a rotary scroll compression mechanism, and the scroll expansion mechanism is a rotary scroll expansion mechanism.

5. the scroll compression mechanism includes a compressor regulator housing, a driving scroll, a transmission slip ring, and a driven scroll, the compressor regulator housing being disposed between one end of the drive mechanism and the drive mechanism to form a compression cavity, the driving scroll, the transmission slip ring, and the driven scroll being disposed sequentially in the compression cavity in a direction away from the drive mechanism, the driving scroll being drivingly connected to a motor shaft of the drive mechanism, and the driving scroll being drivingly connected to the driven scroll via the transmission slip ring, an exhaust hollow shaft being disposed at one end of the driven scroll remote from the driving scroll, the exhaust hollow shaft communicating with a high-pressure exhaust passage, and the compression cavity communicating with a low-pressure air inlet passage, the exhaust hollow shaft being disposed in the compressor regulator housing via a bearing seat of the compressor, and a phase difference between the driving scroll and the driven scroll being 180°, A first driving friction surface and a second driving friction surface are disposed opposite to each other on both sides of the scroll teeth of the driving scroll, a band-shaped first driving portion is disposed on the first driving friction surface along the radial direction, a band-shaped second driving portion is disposed on the second driving friction surface along the radial direction, and a first driven friction surface and a second driven friction surface are disposed opposite to each other on both sides of the scroll teeth of the driven scroll, a band-shaped first driven portion is disposed on the first driven friction surface along the radial direction, and a band-shaped second driven portion is disposed on the second driven friction surface along the radial direction, Two first transmission slip ring fittings are installed opposite to each other on an end surface of the transmission slip ring close to the driven scroll, and the two first transmission slip ring fittings are fitted with the first driving part and the second driving part, respectively. The two first transmission slip ring fittings 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 driving friction surface, and the second transmission slip ring friction surface contacts the second driving friction surface. Two second transmission slip rings are installed opposite to each other on an end surface of the transmission slip ring close to the driven scroll.

5. The energy recovery scroll compressor according to claim 4, wherein two second transmission slip ring fitting portions are disposed opposite each other, the two second transmission slip ring fitting portions are fitted with the first driven portion and the second driven portion, the two second transmission slip ring fitting portions divide the end faces of the transmission slip ring into third transmission slip ring friction surfaces and fourth transmission slip ring friction surfaces, the third transmission slip ring friction surface contacts the first driven portion friction surface, and the fourth transmission slip ring friction surface contacts the second driven portion friction surface, and the transmission slip ring is provided with a plurality of transmission slip ring vent holes in the radial direction connecting the inside and outside.

6. 6. The energy recovery scroll compressor according to claim 5, wherein the driving scroll, the transmission slip ring, and the driven scroll are all sprayed with a self-lubricating coating.

7. 6. The energy recovery scroll compressor according to claim 5, wherein the compression cavity is divided into a working cavity and a regulator cavity by a bearing seat, the exhaust hollow shaft communicates with the high-pressure exhaust passage through the regulator cavity, the low-pressure air inlet passage communicates with the working cavity, and a check valve is installed on an end face of the bearing seat located in the regulator cavity to prevent backflow of gas.

8. the scroll expansion mechanism includes an expander regulator housing, a load scroll, a limit slip ring, and an idle scroll, an expansion cavity is formed between one end of the expander regulator housing installed on the drive mechanism and the drive mechanism, the load scroll, the limit slip ring, and the idle scroll are sequentially arranged in the expansion cavity along a direction away from the drive mechanism, the load scroll is drivingly connected to a motor shaft of the drive mechanism, and the load scroll is drivingly connected to the idle scroll via the limit slip ring, and a phase difference between the load scroll and the idle scroll is 180°; a first loaded friction surface and a second loaded friction surface are disposed opposite each other on both sides of the scroll tooth of the load scroll, a band-shaped first loaded portion is provided on the first loaded friction surface along the radial direction, a band-shaped second loaded portion is provided on the second loaded friction surface along the radial direction, a first idle friction surface and a second idle friction surface are disposed opposite each other on both sides of the scroll tooth of the idle scroll, a band-shaped first idle portion is provided on the first idle friction surface along the radial direction, and a band-shaped second idle portion is provided on the second idle friction surface along the radial direction, Two first limit slip ring fitting portions are provided on an end surface of the limit slip ring close to the load scroll, and the two first limit slip ring fitting portions are fitted with the first load portion and the second load portion, respectively. The two first limit slip ring fitting portions divide the end surface of the limit slip ring into the first limit slip ring friction surface and the second limit slip ring friction surface, and the first limit slip ring friction surface contacts the first load friction surface, and the second limit slip ring friction surface contacts the second load friction surface. The end surface of the limit slip ring close to the idle scroll is provided with two second limit slip rings.

5. The energy recovery scroll compressor according to claim 4, wherein the limit slip ring further comprises a plurality of limit slip ring vent holes extending radially from the inner surface of the limit slip ring to connect the inner and outer surfaces of the limit slip ring. The energy recovery scroll compressor according to claim 4, further comprising: a limit slip ring vent hole extending radially from the inner surface of the limit slip ring to connect the inner and outer surfaces of the limit slip ring; ...

9. 9. The energy recovery scroll compressor according to claim 8, wherein the load scroll, the limit slip ring, and the idle scroll are all sprayed with a self-lubricating coating.

10. 10. A carbon dioxide heat pump system to which the energy recovery scroll compressor according to any one of claims 1 to 9 is applied, wherein a high-pressure side working medium outlet of a regenerator of the carbon dioxide heat pump system communicates with the expansion-end high-pressure working medium passage, an evaporator working medium inlet of the carbon dioxide heat pump system communicates with the expansion-end low-pressure working medium passage, a low-pressure side working medium outlet of a regenerator of the carbon dioxide heat pump system communicates with a low-pressure air inlet passage of the scroll compression mechanism, and a working medium inlet of a cooler of the carbon dioxide heat pump system communicates with a high-pressure exhaust passage of the scroll compression mechanism.

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