Compression expander, heat exchange system and power generation system

Abstract

This application discloses an integrated compression-expansion machine, a heat exchange system, and a power generation system. The integrated compression-expansion machine includes a rotating shaft, a motor, a compression unit, and an expansion unit. The motor is connected to the rotating shaft and drives its rotation; the motor also generates electricity under the influence of the rotating shaft. The compression unit includes a compression chamber and a first impeller. The first impeller is disposed within the compression chamber and connected to the rotating shaft. The first impeller rotates under the influence of the rotating shaft to compress the gaseous working fluid within the compression chamber. The expansion unit includes an expansion chamber and a second impeller. The second impeller is disposed within the expansion chamber and connected to the rotating shaft. The second impeller expands the gaseous working fluid within the expansion chamber and rotates under the influence of the gaseous working fluid, thereby driving the rotating shaft to rotate. The integrated compression-expansion machine can compress and expand the gaseous working fluid. During the expansion of the gaseous working fluid, it can convert the internal energy of the gaseous working fluid to generate electricity.

Description

Technical Field

[0001] This application relates to the field of heat exchange technology, and in particular to an integrated compression-expansion machine, a heat exchange system, and a power generation system. Background Technology

[0002] A compressor can compress a gaseous working medium into a high-temperature, high-pressure state, while an expander can convert a high-temperature, high-pressure gaseous working medium into a low-temperature, low-pressure state.

[0003] Currently, compressors and expanders can be used together in heat exchange systems. However, independently set compressors and expanders make the heat exchange system structure complex and occupy a large space. Summary of the Invention

[0004] One objective of this application is to provide a simple, space-saving integrated compressor-expansion unit, heat exchange system, and power generation system.

[0005] In a first aspect, this application provides a compression-expansion integrated machine, comprising a rotating shaft, a motor, a compression unit, and an expansion unit. The motor is connected to the rotating shaft and drives the rotating shaft to rotate. The motor also generates electricity under the influence of the rotating shaft. The compression unit includes a compression chamber and a first impeller. The first impeller is disposed within the compression chamber and connected to the rotating shaft. The first impeller rotates under the influence of the rotating shaft to compress the gaseous working fluid within the compression chamber. The expansion unit includes an expansion chamber and a second impeller. The second impeller is disposed within the expansion chamber and connected to the rotating shaft. The second impeller expands the gaseous working fluid within the expansion chamber. When expanding the gaseous working fluid, the second impeller rotates under the influence of the gaseous working fluid, thereby driving the rotating shaft to rotate.

[0006] The integrated compressor-expander can compress and expand gaseous working fluids. The motor can act as both a drive device and a generator. When compressing gaseous working fluids, the motor drives the rotating shaft, which in turn drives the first and second impellers. The rotation of the first impeller compresses the gaseous working fluid within the compression chamber.

[0007] When the integrated compressor-expander expands a gaseous working medium, the gaseous working medium in the expansion chamber flows through the second impeller, which drives the second impeller to rotate. The rotating shaft, driven by the second impeller, can generate electricity from the motor. The integrated compressor-expander can convert the internal energy of the gaseous working medium, transforming the high-temperature, high-pressure gaseous working medium into a low-temperature, low-pressure gaseous working medium, thereby achieving energy recovery and reducing energy loss in the gaseous working medium.

[0008] In conjunction with the first aspect, in one possible implementation, the rotating shaft passes through the first impeller, the motor, and the second impeller along the axial direction of the rotating shaft. The first and second impellers share the rotating shaft, which simplifies the structure of the integrated compression-expansion machine and reduces its footprint.

[0009] In conjunction with the first aspect, in one possible implementation, the expansion chamber and the compression chamber are axially spaced along the rotation axis, with the motor positioned between them. Since the motor is outside both the expansion and compression chambers, its installation is unaffected by the dimensions of either chamber during assembly of the integrated compression-expansion machine, improving installation convenience. Specifically, the first impeller is located within the compression chamber, and the second impeller is located within the expansion chamber. Understandably, with the motor positioned between the first and second impellers, the force exerted on the first side of the motor by the first impeller balances the force exerted on the second side by the second impeller, resulting in a more balanced force distribution on the motor and improving the overall stability of the integrated compression-expansion machine.

[0010] In conjunction with the first aspect, in one possible implementation, the expansion chamber and the compression chamber are axially spaced along the rotation axis, with the motor located within the compression chamber. The motor can share space with the compression chamber, allowing for a reduction in the size of the integrated compression-expansion machine. When compressing a gaseous working fluid, the integrated compression-expansion machine allows the gaseous working fluid to flow through the motor, carrying away heat and cooling the motor. As the gaseous working fluid carries away heat from the motor, its temperature and pressure increase, thereby improving the efficiency of the integrated compression-expansion machine in compressing the gaseous working fluid.

[0011] In conjunction with the first aspect, in one possible implementation, the motor is positioned between the first impeller and the second impeller. The force exerted on the first side of the motor by the first impeller can balance the force exerted on the second side of the motor by the second impeller, resulting in a more balanced force distribution on the motor as a whole and improving the overall stability of the integrated compression and expansion machine.

[0012] In conjunction with the first aspect, in one possible implementation, the compression unit includes multiple first impellers, which are spaced apart axially along the rotation axis. The motor is positioned between two adjacent first impellers. The reaction force from the first impeller on the first side of the motor can balance the reaction force from the first impeller on the second side of the motor, resulting in a more balanced force distribution on the motor and improving the overall stability of the integrated compression and expansion machine.

[0013] In conjunction with the first aspect, in one possible implementation, the integrated compression-expansion machine further includes a channel connecting the expansion chamber and the compression chamber. The channel serves to either connect the expansion chamber and the compression chamber or disconnect their connection. The channel allows the gaseous working fluid from the compression chamber to enter the expansion chamber. The compression unit can transport the compressed gaseous working fluid through the channel to the expansion chamber, and the expansion unit expands the compressed gaseous working fluid. Therefore, the integrated compression-expansion machine can perform the functions of compressing and expanding the compressed gaseous working fluid.

[0014] In conjunction with the first aspect, in one possible implementation, the integrated compression-expansion machine further includes a first inlet, a first outlet, a second inlet, and a second outlet. The first inlet is connected to the first outlet via a compression chamber, and the second inlet is connected to the second outlet via an expansion chamber. The first inlet, first outlet, and second inlet all have open and closed states, and the second outlet has at least an open state. The first inlet is used to allow gaseous working fluid from outside the integrated compression-expansion machine to enter the compression chamber, and the second outlet can be used to discharge gaseous working fluid from the compression chamber to outside the integrated compression-expansion machine. The second inlet can be used to allow gaseous working fluid from outside the integrated compression-expansion machine to enter the expansion chamber, and the second outlet is used to discharge gaseous working fluid from the expansion chamber to outside the integrated compression-expansion machine.

[0015] In conjunction with the first aspect, in one possible implementation, the integrated compressor-expander has a compression mode. When the integrated compressor-expander is in compression mode, both the first inlet and the first outlet are open, the communication between the compression chamber and the expansion chamber is interrupted, and the second inlet is closed. The compression unit is used to compress the gaseous working fluid entering the compression chamber from the first inlet and discharge the compressed gaseous working fluid from the first outlet to the outside of the integrated compressor-expander. The integrated compressor-expander can compress gaseous working fluid, realizing the function of a compressor. When the integrated compressor-expander is in compression mode, it does not perform the function of expanding gaseous working fluid.

[0016] In conjunction with the first aspect, in one possible implementation, the integrated compressor-expander has an expansion power generation mode. When the integrated compressor-expander is in the expansion power generation mode:

[0017] The compression chamber and the expansion chamber are disconnected, with the first inlet or the first outlet closed and the second inlet and the second outlet both open; or, the compression chamber and the expansion chamber are connected through a channel, with the first inlet and the first outlet both closed and the second inlet and the second outlet both open.

[0018] The expansion unit is used to expand the gaseous working medium that enters the expansion chamber from the second inlet, and to discharge the expanded gaseous working medium from the second outlet to the outside of the integrated compression and expansion machine.

[0019] The integrated compressor-expander can expand a gaseous working medium that enters the expansion chamber from outside the compressor-expander. The gaseous working medium drives the second impeller to rotate, and the rotating shaft rotates under the drive of the second impeller to generate electricity. When the integrated compressor-expander is in expansion-to-power mode, the first inlet and the first outlet are not connected, and the integrated compressor-expander does not perform the function of compressing the gaseous working medium.

[0020] In conjunction with the first aspect, in one possible implementation, the integrated compression-expansion machine has a first compression-expansion mode. When the integrated compression-expansion machine is in the first compression-expansion mode, the first inlet is in the open state, the first outlet is in the closed state, the compression chamber is connected to the expansion chamber through a channel, the second inlet is in the closed state, and the second outlet is in the open state. The compression unit is used to compress the gaseous working medium entering the compression chamber from the first inlet and to transport the compressed gaseous working medium to the expansion chamber through the channel. The expansion unit is used to expand the gaseous working medium entering the expansion chamber from the channel and to discharge the expanded gaseous working medium out of the integrated compression-expansion machine from the second outlet.

[0021] The integrated compression-expansion unit can compress gaseous working fluids and expand them. When the integrated compression-expansion unit is in the first compression-expansion mode, the compression unit delivers all the compressed gaseous working fluids into the expansion chamber, and the expansion unit expands the compressed gaseous working fluids in the expansion chamber.

[0022] In conjunction with the first aspect, in one possible implementation, the integrated compression-expansion machine has a second compression-expansion mode. When the integrated compression-expansion machine is in the second compression-expansion mode, both the first inlet and the first outlet are open. The compression chamber is connected to the expansion chamber through a channel. The second inlet is closed, and the second outlet is open. The compression unit is used to compress the gaseous working fluid entering the compression chamber from the first inlet, so that a portion of the compressed gaseous working fluid is transported out of the integrated compression-expansion machine from the first outlet, and another portion of the compressed gaseous working fluid is transported into the expansion chamber through the channel. The expansion unit is used to expand the gaseous working fluid in the expansion chamber and transport the expanded gaseous working fluid out of the integrated compression-expansion machine from the second outlet.

[0023] The integrated compressor-expander can compress gaseous working fluid and expand the compressed gaseous working fluid. When the integrated compressor-expander is in the second compression-expansion mode, the compression unit delivers a portion of the compressed gaseous working fluid to the expansion chamber for expansion by the expansion unit. The compression unit then delivers the remaining compressed gaseous working fluid from the first outlet to the outside of the integrated compressor-expander.

[0024] In conjunction with the first aspect, in one possible implementation, the integrated compression and expansion machine also includes a housing that accommodates the expansion chamber, compression chamber, rotating shaft, and motor. The housing protects the rotating shaft, motor, compression unit, and expansion unit, preventing them from directly contacting external objects, thus providing impact and dust protection.

[0025] In conjunction with the first aspect, in one possible implementation, the integrated compression and expansion machine also includes a radial bearing, which is sleeved on the rotating shaft and fixedly connected to the housing. The radial bearing can support the rotating shaft and improve its rotational stability.

[0026] In conjunction with the first aspect, in one possible implementation, the integrated compression and expansion machine further includes an axial thrust bearing sleeved on the rotating shaft. The axial thrust bearing is used to limit the axial position of the first impeller and the second impeller on the rotating shaft. Sleeving the axial thrust bearing on the rotating shaft can reduce the possibility of the first and second impellers shifting during rotation, thereby improving the rotational stability of the first and second impellers.

[0027] Secondly, this application provides a heat exchange system comprising an evaporator, a condenser, and the aforementioned integrated compression-expansion unit; the first end of the evaporator is connected to the compression unit, and the compression unit is connected to the first end of the condenser. Alternatively, the first end of the evaporator is connected to the compression unit, the compression unit is connected to the expansion unit, and the expansion unit is connected to the first end of the condenser. Alternatively, the first end of the evaporator is connected to the expansion unit, and the expansion unit is connected to the first end of the condenser. The second end of the condenser is connected to the second end of the evaporator.

[0028] When the first end of the evaporator is connected to the compression unit, and the compression unit is connected to the first end of the condenser, the integrated compression-expansion unit is in compression mode. The evaporator vaporizes the liquid working fluid and discharges the gaseous working fluid. The integrated compression-expansion unit receives the gaseous working fluid discharged from the evaporator, compresses the received gaseous working fluid, and discharges the compressed gaseous working fluid into the condenser. The condenser liquefies the gaseous working fluid and discharges the liquid working fluid. The evaporator receives the liquid working fluid and vaporizes it. The integrated compression-expansion unit can serve as the power source for the movement of the working fluid in the heat exchange system.

[0029] When the first end of the evaporator is connected to the compression unit, the compression unit is connected to the expansion unit, and the expansion unit is connected to the first end of the condenser, the integrated compression-expansion unit can be in the first compression-expansion mode. The evaporator vaporizes the liquid working fluid and discharges the gaseous working fluid. The integrated compression-expansion unit receives the gaseous working fluid discharged from the evaporator, the compression unit compresses the gaseous working fluid, and delivers the compressed gaseous working fluid to the expansion chamber. The expansion unit expands the compressed gaseous working fluid and then discharges the expanded gaseous working fluid into the condenser. The condenser liquefies the gaseous working fluid and discharges the liquid working fluid. The evaporator receives the liquid working fluid and vaporizes it. Specifically, the compressed gaseous working fluid undergoes expansion treatment by the integrated compression-expansion unit before entering the condenser, which reduces the internal energy of the gaseous working fluid (lowers its temperature), making it easier for the condenser to liquefy the gaseous working fluid, thereby improving the heat exchange efficiency of the heat exchange system. It should be noted that if the internal energy of the gaseous working fluid is too high, the efficiency of the condenser in liquefying the gaseous working fluid will decrease.

[0030] When the first end of the evaporator is connected to the expansion unit, and the expansion unit is connected to the first end of the condenser, the integrated compressor-expander is in expansion-power generation mode. The evaporator vaporizes the liquid working fluid and discharges it as gaseous fluid. The gaseous working fluid discharged from the evaporator enters the expansion unit, which expands it and discharges it to the condenser. The condenser liquefies the gaseous working fluid and discharges it back into the evaporator. During the expansion of the gaseous working fluid, the gaseous fluid drives the second impeller to rotate, which in turn drives the rotating shaft to generate electricity. After expansion by the expansion unit, the temperature of the gaseous working fluid decreases, which is beneficial for the condenser to liquefy it.

[0031] In conjunction with the second aspect, in one possible implementation, the heat exchange system further includes a first pump, which is positioned between the second end of the condenser and the second end of the evaporator. The first pump serves as the power source for driving the working fluid's movement within the heat exchange system. The first pump drives the liquid working fluid, causing it to enter the evaporator, where it vaporizes and converts into a gaseous state. The evaporator then delivers the gaseous working fluid to a compression-expansion unit. This unit delivers the gaseous working fluid to the condenser, and can compress the gaseous working fluid entering the compression chamber from the evaporator. Alternatively, the compression-expansion unit can first compress the gaseous working fluid entering the compression chamber from the evaporator, and then deliver the compressed gaseous working fluid to the expansion chamber, where an expansion unit expands the compressed gaseous working fluid. The compression-expansion unit can also directly expand the gaseous working fluid entering the expansion chamber from the evaporator. The condenser can liquefy the gaseous working fluid, convert the gaseous working fluid into a liquid working fluid, and then deliver the liquid working fluid to the first pump.

[0032] In conjunction with the second aspect, in one possible implementation, the integrated compression-expansion unit includes a first inlet, a first outlet, a second inlet, a second outlet, and a channel; the first inlet is connected to the first outlet through a compression chamber, the second inlet is connected to the second outlet through an expansion chamber, and the compression chamber is connected to the expansion chamber through the channel; the heat exchange system also includes a heat exchanger, which includes a third inlet, a third outlet, a fourth inlet, and a fourth outlet; the first end of the evaporator is connected to the first inlet, the first outlet is connected to the first end of the condenser, the second end of the condenser is connected to the third inlet, the third outlet is connected to the second end of the evaporator, the fourth inlet is connected to the second outlet, and the fourth outlet is connected to the first inlet.

[0033] The integrated compression-expansion unit can operate in a second compression-expansion mode. After the evaporator vaporizes the liquid working fluid, the gaseous working fluid enters the compression chamber through the first inlet. The compression unit compresses the gaseous working fluid and divides it into a first part and a second part. The compression unit discharges the first part of the gaseous working fluid into the condenser through the first outlet, while simultaneously transporting the second part of the gaseous working fluid into the expansion chamber. The expansion unit expands the compressed second part of the gaseous working fluid and discharges it through the second outlet. The gaseous working fluid discharged from the second outlet enters the heat exchanger through the fourth inlet. The condenser liquefies the compressed first part of the gaseous working fluid and discharges the liquid working fluid. The liquid working fluid discharged from the condenser enters the heat exchanger through the third inlet. The heat exchanger utilizes the expanded second part of the gaseous working fluid to cool the liquid working fluid discharged from the condenser, increasing the subcooling of the liquid working fluid and preventing it from vaporizing before entering the evaporator. The heat exchanger can also utilize a second portion of gaseous working fluid to cool the gaseous working fluid discharged from the condenser to the heat exchanger, liquefying it. This second portion of gaseous working fluid entering the heat exchanger exits through the fourth outlet and enters the compression chamber through the first inlet. The liquid working fluid in the heat exchanger exits through the third outlet to the evaporator. The heat exchange efficiency of the evaporator is positively correlated with the amount of liquid working fluid evaporated; the more liquid working fluid evaporated, the more heat the evaporator can exchange, resulting in a better heat exchange efficiency. By utilizing the second portion of gaseous working fluid to cool both the liquid and gaseous working fluid discharged from the evaporator to the heat exchanger, the heat exchanger can discharge more liquid working fluid. During the transfer of liquid working fluid from the heat exchanger to the evaporator, the amount of liquid working fluid vaporization is reduced, resulting in a greater amount of liquid working fluid entering the evaporator, thereby improving the heat exchange efficiency of the evaporator.

[0034] Thirdly, this application provides a power generation system, which includes a second pump, a gasification device, a cooling device, and the aforementioned integrated compression and expansion unit; the first end of the second pump is connected to the first end of the gasification device, the second end of the gasification device is connected to the first end of the cooling device through the integrated compression and expansion unit, and the second end of the cooling device is connected to the second end of the second pump.

[0035] The integrated compressor-expander can operate in expansion-power generation mode. A second pump drives a liquid working fluid into a gasification device. The gasification device vaporizes the liquid working fluid and transfers it to the integrated compressor-expander. The integrated compressor-expander expands the gaseous working fluid and converts its internal energy to generate electricity. The integrated compressor-expander then delivers the expanded gaseous working fluid to a cooling device. The cooling device liquefies the gaseous working fluid and discharges it to the second pump. When the integrated compressor-expander is converting the internal energy of the gaseous working fluid to generate electricity, the expansion chamber receives the gaseous working fluid discharged from the gasification device. The gaseous working fluid flows through a second impeller, causing it to rotate. The second impeller drives a rotating shaft, which in turn drives a motor to generate electricity. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of a heat exchange system provided in Embodiment 1 of this application;

[0038] Figure 2 This is a top view of a compression-expansion integrated machine provided in Embodiment 1 of this application;

[0039] Figure 3 A top view of another compression-expansion integrated machine provided in Embodiment 1 of this application;

[0040] Figure 4 A top view of yet another integrated compression and expansion machine provided in Embodiment 1 of this application;

[0041] Figure 5 This is a schematic diagram of another heat exchange system provided in Embodiment 2 of this application;

[0042] Figure 6 This is a schematic diagram of another heat exchange system provided in Embodiment 3 of this application;

[0043] Figure 7 This is a schematic diagram of another heat exchange system provided in Embodiment 4 of this application;

[0044] Figure 8 This is a schematic diagram of another heat exchange system provided in Embodiment 5 of this application;

[0045] Figure 9 This is a schematic diagram of the power generation system provided in Embodiment 6 of this application.

[0046] 100. Compression and expansion unit; 110. Rotating shaft; 120. Motor; 130. Compression unit; 131. Compression chamber; 132. First impeller; 133. First inlet; 134. First outlet; 140. Expansion unit; 141. Expansion chamber; 142. Second impeller; 143. Second inlet; 144. Second outlet; 150. Channel; 160. Radial bearing; 170. Axial thrust bearing; 180. Housing; 200. Evaporator; 300. Control valve; 400. Condenser; 500. Throttling valve; 600. Heat exchanger; 610. Third inlet; 620. Third outlet; 630. Fourth inlet; 640. Fourth outlet; 700. First pump; 10. Second pump; 20. Preheater; 30. Gasification equipment; 40. Cooling equipment. Detailed Implementation

[0047] The embodiments of this application will now be described with reference to the accompanying drawings.

[0048] Example 1

[0049] This application provides a heat exchange system applicable to scenarios including automobiles, residences, and equipment rooms. For example, the heat exchange system can raise or lower the temperature inside a vehicle through heat exchange. Similarly, it can raise or lower the temperature inside a residence. The heat exchange system can also be applied to other scenarios to raise or lower the temperature of a specific area through heat exchange; these will not be listed exhaustively in this application.

[0050] Please see Figure 1 , Figure 1 This is a schematic diagram of a heat exchange system provided in Embodiment 1 of this application. The heat exchange system may include an evaporator 200, a condenser 400, a compression-expansion integrated unit 100, a throttling valve 500, and a control valve 300. The working fluid can move within the heat exchange system and form a circulation loop. The working fluid includes both gaseous and liquid states. When the working fluid moves within the heat exchange system, it can change from a liquid state to a gaseous state, and vice versa. The working fluid may be Freon.

[0051] The first end of the evaporator 200 is connected to the first end of the control valve 300 via the integrated compression and expansion unit 100. The second end of the control valve 300 is connected to the first end of the condenser 400. The second end of the condenser 400 is connected to the first end of the throttle valve 500. The second end of the throttle valve 500 is connected to the second end of the evaporator 200.

[0052] Evaporator 200 evaporates the liquid working fluid, converting it into a gaseous state. Condenser 400 cools the gaseous working fluid, converting it back into a liquid state. Compression-expansion unit 100 serves as the power source for driving the working fluid's movement within the heat exchange system. Compression-expansion unit 100 compresses the gaseous working fluid, changing it from a low-temperature, low-pressure state to a high-temperature, high-pressure state. It also expands the compressed gaseous working fluid, converting it from a high-temperature, high-pressure state to a low-temperature, low-pressure state. Throttling valve 500 controls the flow rate of the working fluid within the heat exchange system; exemplarily, it controls the flow rate of the liquid working fluid entering evaporator 200.

[0053] During operation of the heat exchange system, the evaporator 200 vaporizes the liquid working fluid and delivers it to the integrated compressor-expander 100. The integrated compressor-expander 100 compresses and drives the gaseous working fluid, causing it to flow through the control valve 300 and into the condenser 400. The condenser 400 liquefies the gaseous working fluid and discharges it from its second end. The liquid working fluid then flows through the throttling valve 500 and returns to the evaporator 200.

[0054] The control valve 300 can control the flow state of the working fluid in the heat exchange system. For example, when the control valve 300 is open, the compression-expansion unit 100 can drive the working fluid to move in the heat exchange system. When the control valve 300 is closed, the control valve 300 blocks the movement path of the working fluid in the heat exchange system.

[0055] See Figure 2 , Figure 2 This is a top view of a compression-expansion integrated machine provided in Embodiment 1 of this application. The compression-expansion integrated machine 100 may include a rotating shaft 110, a motor 120, a compression unit 130, an expansion unit 140, a channel 150, a radial bearing 160, a thrust bearing 170, a housing 180, a first inlet 133, a first outlet 134, a second inlet 143, and a second outlet 144. The motor 120 may be a permanent magnet motor that integrates driving and generating functions. The motor 120 can serve as a power source or convert mechanical energy into electrical energy. The rotating shaft 110 is connected to the motor 120, and the motor 120 can drive the rotating shaft 110 to rotate. When the rotating shaft 110 rotates, it can cause the motor 120 to generate electricity.

[0056] The compression unit 130 includes a compression chamber 131 and a first impeller 132. The first impeller 132 is located inside the compression chamber 131 and is connected to a rotating shaft 110. When the rotating shaft 110 rotates, it drives the first impeller 132 to rotate. The compression chamber 131 is connected to a first inlet 133, which allows gaseous working fluid to enter the compression chamber 131. The compression chamber 131 is also connected to a first outlet 134, which allows the compressed gaseous working fluid inside the compression chamber 131 to be directly discharged outside the compression-expansion integrated machine 100. Both the first inlet 133 and the first outlet 134 have open and closed states. The first impeller 132 can be a centrifugal impeller. The compression unit 130 is used to compress gaseous working fluid. Specifically, the first impeller 132 rotates under the drive of the rotating shaft 110, which can compress low-temperature, low-pressure gaseous working fluid into high-temperature, high-pressure gaseous working fluid.

[0057] The expansion unit 140 includes an expansion chamber 141 and a second impeller 142, with the second impeller 142 located within the expansion chamber 141. The second impeller 142 is connected to a rotating shaft 110, and its rotation drives the rotating shaft 110 to rotate. The expansion chamber 141 is connected to a second inlet 143, allowing gaseous working fluid to enter the expansion chamber 141. The expansion chamber 141 is also connected to a second outlet 144, which discharges the expanded gaseous working fluid from the expansion chamber 141 to the outside of the integrated compressor-expander 100. Both the second inlet 143 and the second outlet 144 have open and closed states. The second impeller 142 can be a centrifugal impeller. The expansion unit 140 is used to expand the gaseous working fluid and generate electricity for the motor 120. Specifically, the second impeller 142 can be driven by the gaseous working fluid entering the expansion chamber 141 to rotate, converting the internal energy of the gaseous working fluid into mechanical energy, thereby reducing the internal energy of the gaseous working fluid and causing it to expand. When the second impeller 142 rotates, it can drive the rotating shaft 110 to rotate, so that the motor 120 can generate electricity.

[0058] The rotating shaft 110, motor 120, compression unit 130, expansion unit 140, channel 150, radial bearing 160, and thrust bearing 170 are housed within the housing 180 to form a single unit. The housing 180 protects the rotating shaft 110, motor 120, compression unit 130, and expansion unit 140 from direct contact with external objects, thus providing impact and dust protection.

[0059] Compression chamber 131 and expansion chamber 141 are spaced apart. Motor 120 is located between expansion chamber 141 and compression chamber 131. Rotating shaft 110 passes through motor 120, first impeller 132 and second impeller 142 along the axial direction of rotating shaft 110.

[0060] Please see Figure 2 The first end of the rotating shaft 110 extending axially into the compression chamber 131 allows the rotating shaft 110 to rotate relative to the compression chamber 131. The second end of the rotating shaft 110 extending axially into the expansion chamber 141 allows the rotating shaft 110 to rotate relative to the expansion chamber 141.

[0061] Please see Figure 2 The motor 120 is located between the first impeller 132 and the second impeller 142. The first impeller 132 is located on the first side of the motor 120, and the second impeller 142 is located on the second side of the motor 120. The reaction force of the first impeller 132 on the first side of the motor 120 can balance the reaction force of the second impeller 142 on the second side of the motor 120, so that the motor 120 is subjected to relatively balanced force and the overall stability of the compression and expansion machine 100 can be improved.

[0062] The channel 150 connects the expansion chamber 141 and the compression chamber 131. The channel 150 can connect the expansion chamber 141 and the compression chamber 131, and it can also disconnect the connection between them. When the channel 150 connects the expansion chamber 141 and the compression chamber 131, the gaseous working fluid in the compression chamber 131 can enter the expansion chamber 141 through the channel 150. When the channel 150 disconnects the connection between the expansion chamber 141 and the compression chamber 131, the gaseous working fluid in the compression chamber 131 cannot enter the expansion chamber 141 through the channel 150. The channel 150 can be a connecting pipe, with one end connected to the compression chamber 131 and the other end connected to the expansion chamber 141. A portion of the connecting pipe can extend outside the housing 180. The channel 150 can also be a flow channel disposed within the housing 180.

[0063] The radial bearing 160 includes an outer ring and an inner ring, which are movably connected and can rotate relative to each other. The inner ring is fitted onto the rotating shaft 110 and fixedly connected to the rotating shaft 110, while the outer ring is fixedly connected to the housing 180. The radial bearing 160 can be an oilless air bearing or a magnetic bearing.

[0064] An axial thrust bearing 170 is sleeved on the rotating shaft 110, and the axial thrust bearing 170 can limit the axial position of the first impeller 132 and the second impeller 142 on the rotating shaft 110. Specifically, the axial thrust bearing 170 can be disposed between the first impeller 132 and the second impeller 142. When the rotating shaft 110 simultaneously drives the first impeller 132 and the second impeller 142 to rotate, the rotation of the first impeller 132 can generate a first axial load, which is parallel to the axis of the rotating shaft 110. The rotation of the second impeller 142 can generate a second axial load, which is also parallel to the axis of the rotating shaft 110. The axial thrust bearing 170 disposed on the rotating shaft 110 can be used to bear the first axial load and react it to the first impeller 132 to balance the first axial load generated by the rotation of the first impeller 132, thereby reducing the possibility of axial displacement of the first impeller 132 due to force imbalance. The axial thrust bearing 170 mounted on the rotating shaft 110 can also bear the second axial load and react on the second impeller 142 to balance the second axial load generated by the rotation of the second impeller 142, thereby reducing the possibility of axial displacement of the second impeller 142 due to force imbalance. Multiple axial thrust bearings 170 can be used.

[0065] The integrated compressor-expander 100 has a compression mode. When the integrated compressor-expander 100 is in compression mode, both the first inlet 133 and the first outlet 134 are open, the second inlet 143 is closed, and the connection between the compression chamber 131 and the expansion chamber 141 is interrupted. When the motor 120 drives the rotating shaft 110 to rotate, the rotating shaft 110 drives the first impeller 132 and the second impeller 142 to rotate. When the first impeller 132 rotates, it can draw the gaseous working medium from the first inlet 133 into the compression chamber 131 and compress the gaseous working medium in the compression chamber 131. The compressed gaseous working medium is discharged out of the integrated compressor-expander 100 through the first outlet 134.

[0066] The integrated compressor-expander 100 has an expansion power generation mode. When the integrated compressor-expander 100 is in the expansion power generation mode, the second inlet 143 and the second outlet 144 are open, the compression chamber 131 and the expansion chamber 141 are disconnected, and the first inlet 133 and / or the first outlet 134 are closed. Alternatively, both the second inlet 143 and the second outlet 144 are open, the compression chamber 131 and the expansion chamber 141 are connected through the channel 150, and both the first inlet 133 and the first outlet 134 are closed.

[0067] The gaseous working fluid can enter the expansion chamber 141 through the second inlet 143. When the pressure of the gaseous working fluid reaches a certain value, it can drive the second impeller 142 to rotate. The second impeller 142 drives the rotating shaft 110 to rotate, which in turn drives the motor 120 to rotate, thus generating electricity. It should be noted that after the gaseous working fluid in the expansion chamber 141 flows through the second impeller 142, its internal energy is converted into the mechanical energy of the impeller 142, causing it to expand. The temperature and pressure of the gaseous working fluid will decrease. The expanded gaseous working fluid is then discharged from the second outlet 144 outside the integrated compression and expansion machine 100.

[0068] The integrated compression-expansion machine 100 also has a first compression-expansion mode. In this mode, the first inlet 133 is open, the first outlet 134 is closed, the compression chamber 131 and the expansion chamber 141 are connected via a channel 150, the second inlet 143 is closed, and the second outlet 144 is open. When the motor 120 drives the rotating shaft 110 to rotate, the rotating shaft 110 drives the first impeller 132 and the second impeller 142 to rotate. Gaseous working fluid outside the integrated compression-expansion machine 100 can enter the compression chamber 131 through the first inlet 133. When the first impeller 132 rotates, it can compress the gaseous working fluid in the compression chamber 131. The compressed gaseous working fluid can enter the expansion chamber 141 through the channel 150. The compressed gaseous working fluid flows through the second impeller 142 and expands. The expanded gaseous working fluid is discharged outside the integrated compression-expansion machine 100 through the second outlet 144. It should be noted that when the gaseous working medium expands in the expansion chamber 141, both its temperature and pressure decrease. The internal energy of the gaseous working medium is converted into mechanical energy to assist the rotation of the second impeller 142, which can reduce the torque required for the rotating shaft 110 to drive the second impeller 142, thereby reducing the power required for the motor 120 to drive the rotating shaft 110.

[0069] When the integrated compressor-expander 100 is in the second compression-expander mode, the first inlet 133 and the first outlet 134 are open, the compression chamber is connected to the expansion chamber through the channel 150, the second inlet 143 is open, and the second outlet 144 is closed. Gaseous working fluid outside the integrated compressor-expander 100 can enter the compression chamber 131 through the first inlet 133. The motor 120 drives the rotating shaft 110 to rotate, which in turn drives the first impeller 132 and the second impeller 142 to rotate. When the first impeller 132 rotates, it can compress the gaseous working fluid in the compression chamber 131. The compressed gaseous working fluid is divided into a first part and a second part. The first part of the gaseous working fluid is discharged outside the integrated compressor-expander 100 through the first outlet 134, and the second part of the gaseous working fluid enters the expansion chamber 141 through the channel 150. The gaseous working fluid entering the expansion chamber 141 flows through the second impeller 142 and expands. The expanded gaseous working fluid is discharged outside the integrated compressor-expander 100 through the second outlet 144. It should be noted that when the gaseous working medium expands in the expansion chamber 141, it changes from a high-temperature, high-pressure state to a low-temperature, low-pressure state. The internal energy of the gaseous working medium is converted into mechanical energy to assist the rotation of the second impeller 142, which can reduce the torque required for the rotating shaft 110 to drive the second impeller 142, and thus reduce the power required for the motor 120 to drive the rotating shaft 110.

[0070] Please see Figure 3 and Figure 4 , Figure 3 This is a top view of another integrated compression and expansion machine provided in Embodiment 1 of this application. Figure 4 This is a top view of another compression-expansion integrated machine provided in Embodiment 1 of this application, and... Figure 2 The difference between the integrated compression and expansion machine shown is that, in Figure 3 In the integrated compression and expansion unit shown, the motor 120 is located inside the compression chamber 131. The motor 120 and the compression chamber 131 can share space, which can reduce the volume occupied by the integrated compression and expansion unit 100. When the compression unit 130 compresses the gaseous working medium, the gaseous working medium can flow through the motor 120, carrying away the heat of the motor 120 and cooling the motor 120.

[0071] The motor 120 can be positioned between the first impeller 132 and the second impeller 142. The reaction force from the first impeller 132 on the first side of the motor 120 can balance the reaction force from the second impeller 142 on the second side of the motor 120, making the overall force on the motor 120 more balanced and improving the overall stability of the compression and expansion machine 100.

[0072] Please see Figure 3 When the compression unit 130 includes a plurality of first impellers 132, the plurality of first impellers 132 can all be disposed on the first side of the motor 120, and the second impeller 142 is located on the second side of the motor 120.

[0073] Please see Figure 4 The motor 120 can be positioned between two adjacent first impellers 132 among a plurality of first impellers 132. The reaction force of the first impeller 132 on the first side of the motor 120 can balance the reaction force of the first impeller 132 on the second side of the motor 120, which can make the overall force on the motor 120 more balanced and improve the overall stability of the compression and expansion machine 100.

[0074] Example 2

[0075] Please see Figure 5 , Figure 5 This is a schematic diagram of another heat exchange system provided in Embodiment 2 of this application. The heat exchange system includes an evaporator 200, a compression-expansion unit 100, a control valve 300, a condenser 400, and a throttling valve 500. For details of the compression-expansion unit 100, please refer to the description in Embodiment 1. The first end of the evaporator 200 is connected to the first inlet 133, and the first outlet 134 is connected to the first end of the control valve 300. The second end of the control valve 300 is connected to the first end of the condenser 400. The second end of the condenser 400 is connected to the first end of the throttling valve 500. The second end of the throttling valve 500 is connected to the second end of the evaporator 200.

[0076] During operation of the heat exchange system, the evaporator 200 evaporates the liquid working fluid, converting it into a gaseous state. The gaseous working fluid is discharged from the first end of the evaporator 200 and flows from the first inlet 133 into the compression chamber 131. The integrated compressor-expander is in compression mode; the compression unit 130 compresses the gaseous working fluid in the compression chamber 131 and drives the compressed gaseous working fluid to be discharged from the first outlet 134. The gaseous working fluid flows through the control valve 300 and then enters the condenser 400. The condenser 400 liquefies the gaseous working fluid, discharging the liquefied working fluid (liquid working fluid) from the second end of the condenser 400. The liquid working fluid discharged from the second end of the condenser 400 flows through the throttle valve 500 and returns to the evaporator 200, thus completing the cycle.

[0077] The integrated compressor-expander 100 serves as the power source driving the working fluid's movement within the heat exchange system, compressing the gaseous working fluid and placing it under high temperature and pressure. Upon entering the condenser 400, this high-temperature, high-pressure working fluid liquefies, releasing a significant amount of heat as it transitions from a gaseous to a liquid state. Understandably, during operation, the heat exchange system can rapidly raise the temperature of a specific area due to the large amount of heat released during the transition. For example, in an automotive system, the condenser 400 liquefies the gaseous working fluid, releasing heat and causing a rapid increase in interior temperature. Conversely, the heat exchange system can also rapidly lower the temperature of a specific area. For instance, in an automotive system, the evaporator 200 vaporizes the liquid working fluid, absorbing a large amount of heat and causing a rapid decrease in interior temperature.

[0078] Example 3

[0079] Please see Figure 6 , Figure 6 This is a schematic diagram of another heat exchange system provided in Embodiment 3 of this application. The heat exchange system includes an evaporator 200, a compression-expansion unit 100, a control valve 300, a condenser 400, a first pump 700, and a throttling valve 500. For details of the compression-expansion unit 100, please refer to the description in Embodiment 1. The first end of the evaporator 200 is connected to the first inlet 133. The second outlet 144 is connected to the first end of the control valve 300, and the second end of the control valve 300 is connected to the first end of the condenser 400. The second end of the condenser 400 is connected to the first pump 700, and the second end of the first pump 700 is connected to the first end of the throttling valve 500. The second end of the throttling valve 500 is connected to the second end of the evaporator 200. When the heat exchange system is running, the evaporator 200 evaporates the liquid working fluid, converting it into a gaseous working fluid. The first end of the evaporator 200 discharges the gaseous working fluid, allowing it to flow from the first inlet 133 into the compression chamber 131. The integrated compression-expansion unit 100 is in the first compression-expansion mode. The compression unit 130 compresses the gaseous working fluid in the compression chamber 131 and transports the compressed gaseous working fluid to the expansion chamber 141 through the channel 150. The expansion unit 140 expands the gaseous working fluid entering the expansion chamber 141 from the compression chamber 131 and discharges the expanded gaseous working fluid from the second outlet 144. The expanded gaseous working fluid flows through the control valve 300 and then enters the condenser 400. The condenser 400 liquefies the gaseous working fluid and discharges the liquefied working fluid (liquid working fluid) from the second end of the condenser 400. The liquid working fluid discharged from the second end of the condenser 400 enters the first pump 700, which drives the liquid working fluid to flow through the throttle valve 500 and then return to the evaporator 200, and the cycle continues.

[0080] In this embodiment, during operation, the first pump 700 serves as the power source driving the liquid working fluid through the heat exchange system, while the integrated compression-expansion unit 100 serves as the power source driving the gaseous working fluid. The integrated compression-expansion unit 100 compresses the gaseous working fluid and drives its movement. Utilizing the first pump 700 to drive the liquid working fluid increases its movement speed within the heat exchange system, thereby shortening its cycle time. The working fluid is the heat exchange medium in the system; the shorter its cycle time, the higher the heat exchange rate and the better the heat exchange effect. As the working fluid moves through the system, it sequentially flows through the evaporator 200, the integrated compression-expansion unit 100, the control valve 300, the condenser 400, the first pump 700, and the throttling valve 500, before returning to the evaporator 200. As the working fluid flows through the evaporator 200, it is vaporized and absorbs heat, enabling the heat exchange system to achieve refrigeration. When the working fluid flows through the condenser 400, it is liquefied and releases heat, enabling the heat exchange system to generate heat. Within a given time period, the shorter the cycle of the working fluid's movement through the heat exchange system, the more times it flows through the condenser 400 and evaporator 200. The more times the working fluid is vaporized in the evaporator 200, the more times it is liquefied in the condenser 400, resulting in greater heat exchange capacity and a better heat exchange effect.

[0081] The integrated compression-expansion unit compresses and then expands the gaseous working fluid to improve the cooling effect of the heat exchange system. The expansion and compression of the gaseous working fluid lowers its temperature. This cooled gaseous fluid enters the condenser 400, making it easier for the condenser to liquefy, thus improving the condenser's liquefaction efficiency. The higher the condenser's liquefaction efficiency, the more heat is released during liquefaction, resulting in better heating performance of the heat exchange system. Furthermore, the higher the condenser's liquefaction efficiency, the more gaseous working fluid is liquefied, and the more liquid working fluid is discharged from the condenser. This allows the evaporator 200 to vaporize more liquid working fluid, absorbing more heat during vaporization, further enhancing the cooling effect of the heat exchange system.

[0082] Example 4

[0083] Please see Figure 7 , Figure 7This is a schematic diagram of another heat exchange system provided in Embodiment 4 of this application. The heat exchange system may include an evaporator 200, a compression-expansion unit 100, a control valve 300, a condenser 400, a throttling valve 500, and a first pump 700. For details of the compression-expansion unit 100, please refer to the description in Embodiment 1. The first end of the evaporator 200 is connected to the second inlet 143, and the second outlet 144 is connected to the first end of the control valve 300. The second end of the control valve 300 is connected to the first end of the condenser 400, and the second end of the condenser 400 is connected to the second end of the first pump 700. The second end of the first pump 700 is connected to the first end of the throttling valve 500, and the second end of the throttling valve 500 is connected to the second end of the evaporator 200.

[0084] During operation of the heat exchange system, the first pump 700 drives the liquid working fluid, causing it to flow through the throttling valve 500 and into the evaporator 200. The evaporator 200 vaporizes the liquid working fluid and discharges the gaseous working fluid. The integrated compressor-expander 100 operates in expansion and power generation mode. The gaseous working fluid discharged from the evaporator 200 enters the expansion unit 140, which expands the gaseous working fluid, reducing its temperature and pressure. The expanded gaseous working fluid is discharged from the second outlet 144, flows through the control valve 300, and then enters the condenser 400. The condenser 400 liquefies the gaseous working fluid and discharges the liquid working fluid. The liquid working fluid then returns to the first pump 700, and the cycle continues.

[0085] When the expansion unit 140 expands the gaseous working fluid, the gaseous working fluid flows through the second impeller 142, driving the second impeller 142 to rotate. The second impeller 142 drives the rotating shaft 110 to rotate, causing the motor 120 to generate electricity. When the gaseous working fluid flows through the second impeller 142, the internal energy of the gaseous working fluid is converted into mechanical energy to drive the rotation of the second impeller 142, and the temperature and pressure of the gaseous working fluid will decrease. The cooled gaseous working fluid enters the condenser 400, which helps to improve the efficiency of the condenser 400 in liquefying the gaseous working fluid, allowing more gaseous working fluid to be liquefied. The condenser 400 releases more heat when liquefying the gaseous working fluid, thereby improving the heating effect of the heat exchange system. The condenser 400 can liquefy more gaseous working fluid, and more liquid working fluid will be discharged from the condenser 400, resulting in more liquid working fluid entering the evaporator 200. The evaporator 200 can vaporize more liquefied working fluid, absorb more heat, and improve the cooling effect of the heat exchange system.

[0086] Example 5

[0087] Please see Figure 8 , Figure 8This is a schematic diagram of another heat exchange system provided in Embodiment 5 of this application. The heat exchange system includes an evaporator 200, a compression-expansion unit 100, a control valve 300, a condenser 400, a throttling valve 500, and a heat exchanger 600. For details of the compression-expansion unit 100, please refer to the description in Embodiment 1. The first end of the evaporator 200 is connected to the first inlet 133, and the first outlet 134 is connected to the first end of the control valve 300. The second end of the control valve 300 is connected to the first end of the condenser 400. The second end of the condenser 400 is connected to the third inlet 610, and the third outlet 620 is connected to the first end of the throttling valve 500. The second end of the throttling valve 500 is connected to the second end of the evaporator 200. The second outlet 144 is connected to the fourth inlet 630 of the heat exchanger 600, and the fourth outlet 640 is connected to the first inlet 133.

[0088] During operation of the heat exchange system, the evaporator 200 evaporates the liquid working fluid, converting it into a gaseous working fluid. The gaseous working fluid is discharged from the first end of the evaporator 200 and flows from the first inlet 133 into the compression chamber 131. The integrated compression-expansion unit 100 is in the second compression-expansion mode. The compression unit 130 compresses the gaseous working fluid in the compression chamber 131. The compressed gaseous working fluid is divided into a first part and a second part. The first part of the gaseous working fluid is discharged from the first outlet 134, flows through the control valve 300, and enters the condenser 400. The condenser 400 liquefies the first part of the gaseous working fluid and discharges the liquefied working fluid (liquid working fluid) from the second end of the condenser 400. While the condenser 400 is liquefying the first part of the gaseous working fluid, a third part of the gaseous working fluid may remain unliquefied within the first part. The liquid working fluid discharged from the second end of the condenser 400 and the third gaseous working fluid enter the heat exchanger 600 through the third inlet 610. The second gaseous working fluid enters the expansion chamber 141 through the channel 150, where the expansion unit 140 expands the second gaseous working fluid, causing it to change to a low-temperature, low-pressure state. The second gaseous working fluid enters the heat exchanger 600 through the fourth inlet 630, where it cools the liquid working fluid entering the heat exchanger 600. Simultaneously, the heat exchanger 600 can also use the second gaseous working fluid to liquefy the third gaseous working fluid. The heat exchanger 600 discharges the liquid working fluid through the third outlet 620 into the throttling valve 500, which controls the flow rate of the liquid working fluid and discharges it into the evaporator 200. The heat exchanger 600 discharges the second part of the gaseous working fluid through the fourth outlet 640 to the first inlet 133, and the second part of the gaseous working fluid returns from the first inlet 133 to the compression chamber 131.

[0089] The integrated compression-expansion unit 100 divides the compressed gaseous working fluid into a first part and a second part. The first part of the gaseous working fluid is condensed by the condenser 400, and the liquefied gaseous working fluid and a small amount of the third part of the gaseous working fluid enter the heat exchanger 600. The second part of the gaseous working fluid expands after entering the expansion chamber 141, transforming into a low-temperature, low-pressure gaseous working fluid. The heat exchanger 600 uses the second part of the gaseous working fluid to further cool the liquid working fluid and the third part of the gaseous working fluid entering the heat exchanger 600. This reduces the internal energy of the liquid working fluid entering the heat exchanger 600, increases the subcooling of the liquid working fluid, and makes it less likely for the liquid working fluid to vaporize during its transfer from the heat exchanger 600 to the evaporator 200. Simultaneously, the second part of the gaseous working fluid can also liquefy the third part of the gaseous working fluid, reducing the amount of un-phase-changed gaseous working fluid entering the evaporator 200 and increasing the amount of liquid working fluid entering the evaporator 200, thereby improving the heat exchange efficiency of the evaporator 200. It should be noted that the heat exchange efficiency of evaporator 200 is positively correlated with the amount of liquid working fluid evaporated by evaporator 200. The more liquid working fluid evaporated by evaporator 200, the more heat it can exchange, and the better its heat exchange efficiency. It should also be noted that... Figure 8 When the heat exchange system shown is used to cool a certain area, the cooling effect of the heat exchange system will be improved because the heat exchange efficiency of the evaporator 200 is enhanced. For example, if the heat exchange system is applied to a car, when the heat exchange system cools the car interior, the enhanced heat exchange efficiency of the evaporator 200 allows it to absorb more heat from the car interior, resulting in a better cooling effect for the car interior.

[0090] Example 6

[0091] Please see Figure 9 , Figure 9 This is a schematic diagram of the power generation system provided in Embodiment 6 of this application. The power generation system includes a second pump 10, a preheater 20, a gasification device 30, a cooling device 40, and a compression-expansion integrated machine 100. For details of the compression-expansion integrated machine 100, please refer to the description in Embodiment 1. The first end of the second pump 10 is connected to the first end of the preheater 20, the second end of the preheater 20 is connected to the first end of the gasification device 30, the second end of the gasification device 30 is connected to the second inlet 143, the second outlet 144 is connected to the first end of the cooling device 40, and the second end of the cooling device 40 is connected to the second end of the second pump 10.

[0092] During operation of the power generation system, the second pump 10 drives the liquid working fluid, which is then discharged into the preheater 20. The preheater 20 heats the liquid working fluid to increase its internal energy. It should be noted that the higher the internal energy of the liquid working fluid, the easier it is to vaporize. The liquid working fluid discharged from the preheater 20 enters the vaporization device 30, where it evaporates, thus vaporizing the liquid working fluid. The gaseous working fluid discharged from the vaporization device 30 enters the expansion chamber 141 through the second inlet 143. As the gaseous working fluid flows through the second impeller 142, it drives the second impeller 142 to rotate. The second impeller 142 drives the rotating shaft 110 to rotate, which in turn drives the motor 120 to generate electricity. After flowing through the second impeller 142, the gaseous working fluid expands and is discharged from the second outlet 144 to the cooling device 40. The cooling device 40 liquefies the gaseous working fluid, and the liquefied gaseous working fluid is returned to the second pump 10. During the liquefaction of the gaseous working fluid, the cooling device 40 can cool the gaseous working fluid with cold air to cause a phase change. The vaporization device 30 can be an evaporator, and the cooling device 40 can be a condenser.

[0093] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A compression and expansion integrated machine, characterized in that, include: Rotating shaft; An electric motor is connected to the rotating shaft. The motor is used to drive the rotating shaft to rotate and also to generate electricity under the drive of the rotating shaft. A compression unit, comprising a compression chamber and a first impeller, wherein the first impeller is disposed within the compression chamber and connected to the rotating shaft, and the first impeller is used to rotate under the drive of the rotating shaft to compress the gaseous working fluid in the compression chamber; An expansion unit includes an expansion chamber and a second impeller. The second impeller is disposed inside the expansion chamber and connected to the rotating shaft. The second impeller is used to expand the gaseous working medium inside the expansion chamber. When expanding the gaseous working medium inside the expansion chamber, the second impeller rotates under the drive of the gaseous working medium to drive the rotating shaft to rotate. The integrated compression and expansion machine also includes a channel connecting the expansion chamber and the compression chamber; the channel is used to connect the expansion chamber and the compression chamber, or to disconnect the connection between the expansion chamber and the compression chamber.

2. The integrated compression and expansion machine as described in claim 1, characterized in that, The rotating shaft passes through the first impeller, the motor, and the second impeller along the axial direction of the rotating shaft.

3. The integrated compression and expansion machine as described in claim 2, characterized in that, The expansion chamber and the compression chamber are spaced apart along the axial direction of the rotation axis, and the motor is located between the expansion chamber and the compression chamber.

4. The integrated compression and expansion machine as described in claim 2, characterized in that, The expansion chamber and the compression chamber are spaced apart along the axial direction of the rotation axis, and the motor is located in the compression chamber.

5. The integrated compression and expansion machine as described in claim 4, characterized in that, The motor is located between the first impeller and the second impeller.

6. The integrated compression and expansion machine as described in claim 4, characterized in that, The compression unit includes a plurality of first impellers, which are spaced apart along the axial direction of the rotation shaft, and the motor is located between two adjacent first impellers.

7. The integrated compression and expansion machine as described in claim 1, characterized in that, The integrated compression and expansion machine further includes a first inlet, a first outlet, a second inlet, and a second outlet. The first inlet is connected to the first outlet through the compression chamber, and the second inlet is connected to the second outlet through the expansion chamber. The first inlet, the first outlet, and the second inlet all have an open state and a closed state, and the second outlet has at least an open state.

8. The integrated compression and expansion machine as described in claim 7, characterized in that, The integrated compression and expansion unit has a compression mode. When the integrated compression and expansion unit is in the compression mode, both the first inlet and the first outlet are open, the communication between the compression chamber and the expansion chamber is interrupted, and the second inlet is closed. The compression unit is used to compress the gaseous working fluid that enters the compression chamber from the first inlet and discharge the compressed gaseous working fluid from the first outlet to the outside of the integrated compression and expansion unit.

9. The integrated compression and expansion machine as described in claim 7, characterized in that, The integrated compression and expansion unit has an expansion power generation mode. When the integrated compression and expansion unit is in the expansion power generation mode: The compression chamber and the expansion chamber are disconnected, the first inlet or the first outlet is closed, and the second inlet and the second outlet are both open. Alternatively, the compression chamber and the expansion chamber are connected through the channel, with the first inlet and the first outlet both in a closed state, and the second inlet and the second outlet both in an open state; The expansion unit is used to expand the gaseous working medium that enters the expansion chamber from the second inlet, and to discharge the expanded gaseous working medium from the second outlet to the outside of the integrated compression and expansion machine.

10. The integrated compression and expansion machine as described in claim 7, characterized in that, The integrated compression and expansion unit has a first compression and expansion mode. When the integrated compression and expansion unit is in the first compression and expansion mode, the first inlet is in the open state, the first outlet is in the closed state, the compression chamber is connected to the expansion chamber through the channel, the second inlet is in the closed state, and the second outlet is in the open state. The compression unit is used to compress the gaseous working fluid entering the compression chamber from the first inlet and to transport the compressed gaseous working fluid to the expansion chamber through the channel. The expansion unit is used to expand the gaseous working fluid entering the expansion chamber from the channel and to discharge the expanded gaseous working fluid out of the integrated compression and expansion unit from the second outlet.

11. The integrated compression and expansion machine as described in claim 7, characterized in that, The integrated compression and expansion unit has a second compression and expansion mode. When the integrated compression and expansion unit is in the second compression and expansion mode, both the first inlet and the first outlet are open. The compression chamber is connected to the expansion chamber through the channel. The second inlet is closed, and the second outlet is open. The compression unit is used to compress the gaseous working fluid entering the compression chamber from the first inlet, so that a portion of the compressed gaseous working fluid is transported out of the integrated compression and expansion unit from the first outlet, and another portion of the compressed gaseous working fluid is transported into the expansion chamber from the channel. The expansion unit is used to expand the gaseous working fluid in the expansion chamber and transport the expanded gaseous working fluid out of the integrated compression and expansion unit from the second outlet.

12. The integrated compression and expansion machine as described in claim 1, characterized in that, The integrated compression and expansion machine also includes a housing, which houses the expansion chamber, the compression chamber, the rotating shaft, and the motor.

13. The integrated compression and expansion machine as described in claim 12, characterized in that, The integrated compression and expansion machine also includes a radial bearing, which is sleeved on the rotating shaft and fixedly connected to the housing.

14. The integrated compression and expansion machine as described in claim 1, characterized in that, The integrated compression and expansion machine also includes an axial thrust bearing, which is sleeved on the rotating shaft and is used to limit the first impeller and the second impeller to the axial position of the rotating shaft.

15. A heat exchange system, characterized in that, The heat exchange system includes an evaporator, a condenser, and a compression-expansion integrated machine as described in any one of claims 1-14; The first end of the evaporator is connected to the compression unit, and the compression unit is connected to the first end of the condenser; or, the first end of the evaporator is connected to the compression unit, the compression unit is connected to the expansion unit, and the expansion unit is connected to the first end of the condenser; or, the first end of the evaporator is connected to the expansion unit, and the expansion unit is connected to the first end of the condenser. The second end of the condenser is connected to the second end of the evaporator.

16. The heat exchange system as described in claim 15, characterized in that... The heat exchange system further includes a first pump, which is disposed between the second end of the condenser and the second end of the evaporator.

17. The heat exchange system as described in claim 16, characterized in that, The integrated compression and expansion unit includes a first inlet, a first outlet, a second inlet, a second outlet, and a channel; the first inlet is connected to the first outlet through the compression chamber, the second inlet is connected to the second outlet through the expansion chamber, and the compression chamber is connected to the expansion chamber through the channel; the heat exchange system further includes a heat exchanger, which includes a third inlet, a third outlet, a fourth inlet, and a fourth outlet; the first end of the evaporator is connected to the first inlet, the first outlet is connected to the first end of the condenser, the second end of the condenser is connected to the third inlet, the third outlet is connected to the second end of the evaporator, the fourth inlet is connected to the second outlet, and the fourth outlet is connected to the first inlet.

18. A power generation system, characterized in that, The power generation system includes a second pump, a gasification device, a cooling device, and a compression-expansion integrated machine as described in any one of claims 1-14; The first end of the second pump is connected to the first end of the gasification device, the second end of the gasification device is connected to the first end of the cooling device through the integrated compression and expansion machine, and the second end of the cooling device is connected to the second end of the second pump.

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