A four-stage tandem double-acting liquid piston stirling refrigeration and heating device

Abstract

This invention discloses a four-stage series double-acting liquid piston Stirling refrigeration and heating device, relating to the field of Stirling refrigeration technology. It includes an outdoor unit and an indoor unit. The indoor unit includes a first refrigeration unit and a second refrigeration unit, while the outdoor unit includes an engine first and an engine second. Engine first is connected to a first solar collector, and engine second is connected to a second solar collector. This invention employs the aforementioned four-stage series double-acting liquid piston Stirling refrigeration and heating device. By replacing the traditional mechanical piston with a liquid piston, it solves the inherent problems of traditional Stirling refrigeration machines, such as working fluid leakage and difficult maintenance. This improves the stability and reliability of the refrigeration system, significantly extending its service life. The four-stage series mechanism enables cascaded energy utilization, reducing energy consumption. It allows for switching between refrigeration and heating modes, has a simple structure, is economical and environmentally friendly, and can greatly meet the needs of daily life.

Description

Technical Field

[0001] This invention relates to the field of Stirling refrigerator technology, and in particular to a four-stage series double-acting liquid piston Stirling refrigeration and heating device. Background Technology

[0002] Traditional Stirling refrigerators have the following problems:

[0003] (1) Traditional mechanical pistons have friction loss and wear problems, and the vibration and noise generated by mechanical movement are large (usually above 70dB), which affects the stability of the equipment. In particular, additional vibration reduction design is required in precision instruments (such as infrared detectors and aerospace equipment).

[0004] (2) Multi-stage refrigeration systems are usually driven by mechanical linkages, with many reciprocating motion parts and high structural complexity, resulting in large size. Stirling refrigerators rely on the reciprocating motion of precision mechanical parts such as pistons, connecting rods, and gas distribution valves. Long-term operation is prone to seal failure or component fatigue fracture due to friction and wear, making maintenance difficult and service life short.

[0005] (3) There is a contradiction between energy consumption and reliability. To improve refrigeration efficiency, the number of stages needs to be increased. However, the more stages there are, the higher the mechanical failure rate, the significantly higher the maintenance cost, and the higher the energy consumption.

[0006] (4) It has limited functionality and limited application scenarios. Summary of the Invention

[0007] The purpose of this invention is to provide a four-stage series double-acting liquid piston Stirling refrigeration and heating device to solve the problems existing in the background art.

[0008] To achieve the above objectives, the present invention provides a four-stage series double-acting liquid piston Stirling refrigeration and heating device, comprising an outdoor unit and an indoor unit. The indoor unit includes a first refrigeration unit and a second refrigeration unit. The outdoor unit includes a first engine and a second engine. The high-temperature end of the first engine is connected to the room-temperature end of the second engine. The high-temperature end of the second engine is connected to the room-temperature end of the first refrigeration unit. The low-temperature end of the first refrigeration unit is connected to the room-temperature end of the second refrigeration unit. The low-temperature end of the second refrigeration unit is connected to the room-temperature end of the first engine. All of the above connections are achieved through gas pipelines.

[0009] The first engine is connected to the first solar collector, and the second engine is connected to the second solar collector;

[0010] The engine includes a liquid piston, which is connected to the gas pipeline. The gas pipeline is sequentially equipped with a high-temperature heat exchanger, a pressure sensor, a regenerator, and a room-temperature heat exchanger. Both the room-temperature heat exchanger and the high-temperature heat exchanger are connected to the solar collector via a heat-conducting pipeline and a three-way valve.

[0011] The first refrigerator includes a third liquid piston, which is connected to the gas pipeline. The gas pipeline is sequentially provided with a third room temperature heat exchanger, a third regenerator, a first temperature sensor, and a first low temperature heat exchanger.

[0012] The low-temperature end of the first refrigeration unit is located inside the first room;

[0013] The room temperature heat exchanger four is located outside room one and connected to water storage tank one.

[0014] Preferably, the second engine includes a second liquid piston connected to the gas pipeline. The gas pipeline is sequentially provided with a second room temperature heat exchanger, a second regenerator, a second pressure sensor, and a second high temperature heat exchanger. Both the second high temperature heat exchanger and the second room temperature heat exchanger are connected to the second solar collector via a second heat conduction pipeline and a three-way valve.

[0015] Preferably, the second refrigerator includes a fourth liquid piston, which is connected to the gas pipeline. The gas pipeline is sequentially provided with a fourth room temperature heat exchanger, a fourth regenerator, a second temperature sensor, and a second low temperature heat exchanger.

[0016] The low-temperature end of the second refrigeration unit is located inside the second chamber;

[0017] The room temperature heat exchanger is located outside the second room and is connected to the second water storage tank.

[0018] Preferably, the data from pressure sensor one, pressure sensor two, temperature sensor one, and temperature sensor two are processed synchronously through a high-speed multi-channel data acquisition device to analyze the various parameters under operating conditions.

[0019] Preferably, the first liquid piston, the second liquid piston, the third liquid piston, and the fourth liquid piston are all disposed in a U-shaped pipeline.

[0020] Preferably, the U-shaped pipe and the gas pipe are connected by a flange, and the ends of the gas pipe connected to the U-shaped pipe are provided with gas chambers.

[0021] Preferably, the three-way valve controls the opening and closing of the heat-conducting pipeline. In summer, the high-temperature heat exchanger is connected to the solar collector, and the system performs a cooling function, with the chiller cooling room. In winter, the room temperature heat exchanger is connected to the solar collector, and the system performs a heating function, with the chiller heating room.

[0022] Preferably, the three-way valve 2 controls the opening and closing of the heat-conducting pipeline 2. In summer, the high-temperature end heat exchanger 2 is connected to the solar collector 2, at which time the system performs the cooling function, and the chiller 2 cools room 2. In winter, the room temperature end heat exchanger 3 is connected to the solar collector 2, at which time the system performs the heating function, and the chiller 2 heats room 2.

[0023] Therefore, the present invention employs the above-mentioned four-stage series double-acting liquid piston Stirling refrigeration and heating device, which has the following beneficial effects:

[0024] (1) This device replaces the traditional mechanical piston with a liquid piston, which solves the inherent problems of traditional Stirling refrigerators such as working fluid leakage and maintenance difficulties. The stability and reliability of the refrigeration system are improved, and the service life is greatly extended.

[0025] (2) This device adopts a four-stage series mechanism to realize energy cascade utilization and reduce energy consumption.

[0026] (3) This device can switch between cooling and heating modes. It has a simple structure, is economical and environmentally friendly, and can greatly solve the needs of daily life.

[0027] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an embodiment of a four-stage series double-acting liquid piston Stirling refrigeration and heating device according to the present invention;

[0029] Figure reference numerals: 1. Pressure sensor one; 2. Solar collector one; 3. High-temperature heat exchanger one; 4. Three-way valve one; 5. Liquid piston one; 6. Room temperature heat exchanger two; 7. Regenerator two; 8. Pressure sensor two; 9. High-temperature heat exchanger two; 10. Flange; 11. Gas chamber; 12. Liquid piston two; 13. Three-way valve two; 14. Room temperature heat exchanger three; 15. Solar collector two; 16. Regenerator three; 17. Temperature 18. Sensor 1; 19. Low-temperature heat exchanger 1; 20. Liquid piston 3; 21. Room temperature heat exchanger 4; 22. Water tank 1; 23. Regenerator 4; 24. Temperature sensor 2; 25. Low-temperature heat exchanger 2; 26. Liquid piston 4; 27. Room temperature heat exchanger 1; 28. Water tank 2; 29. ​​Gas pipeline; 30. Regenerator 1; 31. Engine 1; 32. Engine 2; 33. Refrigeration unit 1; 34. Refrigeration unit 2. Detailed Implementation

[0030] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] Example

[0033] Please see Figure 1This invention provides a four-stage series double-acting liquid piston Stirling refrigeration and heating device, including an outdoor unit and an indoor unit. The indoor unit includes a first chiller 32 and a second chiller 33, both of which are liquid piston Stirling chillers. The outdoor unit includes a first engine 30 and a second engine 31, both of which are liquid piston Stirling engines. The high-temperature end of the first engine 30 is connected to the room-temperature end of the second engine 31, the high-temperature end of the second engine 31 is connected to the room-temperature end of the first chiller 32, the low-temperature end of the first chiller 32 is connected to the room-temperature end of the second chiller 33, and the low-temperature end of the second chiller 33 is connected to the room-temperature end of the first engine 30. All these connections are achieved through a gas pipeline 28. The first engine 30 is connected to a first solar collector 2, and the second engine 31 is connected to a second solar collector 15.

[0034] Engine 30 includes a liquid piston 5, which is connected to a gas pipeline 28. The gas pipeline 28 is sequentially equipped with a high-temperature heat exchanger 3, a pressure sensor 1, a regenerator 29, and a room-temperature heat exchanger 26. Both the room-temperature heat exchanger 26 and the high-temperature heat exchanger 3 are connected to a solar collector 2 via a heat conduction pipeline 1, a three-way valve 1, and a solar collector 2.

[0035] Engine 2 31 includes liquid piston 2 12, which is connected to gas pipeline 28. Gas pipeline 28 is sequentially equipped with room temperature end heat exchanger 2 6, regenerator 2 7, pressure sensor 2 8 and high temperature end heat exchanger 2 9. Both high temperature end heat exchanger 2 9 and room temperature end heat exchanger 2 6 are connected to solar collector 2 15 through heat conduction pipeline 2 via a three-way valve.

[0036] The chiller 32 includes a liquid piston 19 connected to a gas pipeline 28. The gas pipeline 28 is sequentially equipped with a room temperature heat exchanger 14, a regenerator 16, a temperature sensor 17, and a low-temperature heat exchanger 18. The low-temperature end of the chiller 32 is located inside the room, while the room temperature heat exchanger 20 is located outside the room and connected to a water storage tank 21. The water storage tank absorbs the waste heat released from the water storage tank and heats the water stored in the tank 21 for domestic use.

[0037] The second chiller 33 includes a liquid piston 4 25, which is connected to a gas pipeline 28. The gas pipeline 28 is sequentially equipped with a room temperature heat exchanger 4 20, a regenerator 4 22, a temperature sensor 2 23, and a low temperature heat exchanger 24. The low temperature end of the second chiller 33 is located inside the second chamber, while the room temperature heat exchanger 26 is located outside the second chamber and connected to a water storage tank 27. The water storage tank 27 absorbs the waste heat released from the heat exchanger and heats the water stored in the tank for domestic use.

[0038] The data from pressure sensor 1, pressure sensor 2, temperature sensor 17, and temperature sensor 23 are processed synchronously through a high-speed multi-channel data acquisition device to analyze various parameters under operating conditions. The high-speed multi-channel data acquisition device is a mature existing technology and will not be described in detail here.

[0039] Liquid piston 1 (5), liquid piston 2 (12), liquid piston 3 (19), and liquid piston 4 (25) are all installed in a U-shaped pipeline. The liquid and gaseous working fluids in the liquid pistons can be selected from various working fluids (such as water and air), making them green, environmentally friendly, safe, and economical. The U-shaped pipeline and the gas pipeline 28 are connected by a flange 10, and each end of the gas pipeline 28 connected to the U-shaped pipeline is provided with a gas chamber 11.

[0040] The opening and closing of the heat transfer pipes are controlled by three-way valve 4 and three-way valve 13 to heat the heat exchangers at different ends of engine 30 and engine 31, thereby realizing the system's cooling / heating (cooling in summer and heating in winter) function switching.

[0041] Specifically, three-way valve one controls the opening and closing of heat transfer pipe one. In summer, it connects the high-temperature end heat exchanger one 3 to the solar collector one 2, at which point the system performs a cooling function, and chiller one 32 cools room one. In winter, it connects the room temperature end heat exchanger two 6 to the solar collector one 2, at which point the system performs a heating function, and chiller one 32 heats room one. Three-way valve two controls the opening and closing of heat transfer pipe two. In summer, it connects the high-temperature end heat exchanger two 9 to the solar collector two 15, at which point the system performs a cooling function, and chiller two 33 cools room two. In winter, it connects the room temperature end heat exchanger three 14 to the solar collector two 15, at which point the system performs a heating function, and chiller two 33 heats room two.

[0042] Taking the refrigeration working cycle as an example, the system cycle process in this embodiment is as follows:

[0043] Step S1: The high-temperature end heat exchanger 3 of engine 30 is connected to the solar collector 2 via a three-way valve 4. The high-temperature end is heated, the gaseous working fluid expands due to heat, the gas pressure increases, generating power to push the liquid piston 5 to move towards the room temperature end of engine 31.

[0044] Step S2: The gaseous working fluid of engine 2 31 is compressed at room temperature, releasing heat to the environment;

[0045] Step S3: The gaseous working fluid flows from the room temperature end of the second engine 31 to the high temperature end of the second engine 31. When it flows through the second regenerator 7, it absorbs the stored heat and the temperature rises.

[0046] Step S4: The gaseous working fluid absorbs heat at the high-temperature end of engine 2 31 (the high-temperature end heat exchanger 2 9 of engine 2 31 is connected to solar collector 2 15 via three-way valve 2 13). The gaseous working fluid expands due to heat, the gas pressure increases, and power is generated, pushing the liquid piston 2 12 to move towards the room temperature end of refrigerator 1 32.

[0047] Step S5: The gaseous working fluid of refrigerator 32 is compressed at room temperature, releasing heat to the environment;

[0048] Step S6: The gaseous working fluid of the refrigerator 32 flows from the room temperature end to the low temperature end, and releases heat when it flows through the regenerator 16, and the temperature decreases.

[0049] Step S7: The gaseous working fluid of refrigerator 32 absorbs ambient heat at the low temperature end (for room 1 cooling). The gaseous working fluid expands when heated, the gas pressure increases, and power is generated, pushing the liquid piston 19 to move towards the room temperature end of refrigerator 33.

[0050] Step S8: The gaseous working fluid of the second refrigerator 33 is compressed at room temperature, releasing heat. This heat is absorbed by the first water tank 21.

[0051] Step S9: The gaseous working fluid of the second refrigerator 33 flows from the room temperature end to the low temperature end, and releases heat when it flows through the fourth regenerator 22, and the temperature decreases.

[0052] Step S10: The gaseous working fluid of the second refrigerator 33 absorbs ambient heat at the low temperature end of the second refrigerator 33 (for the second room cooling). The gaseous working fluid expands when heated, the gas pressure increases, and power is generated, pushing the liquid piston 4 25 to move towards the room temperature end of the engine 1 30.

[0053] Step S11: The gaseous working fluid of engine 30 is compressed at room temperature and releases heat. This heat is absorbed by water tank 27. The gaseous working fluid of engine 30 flows back from high temperature to room temperature. When it flows through the regenerator, it releases heat and the temperature decreases. The regenerator 29 stores the heat.

[0054] Step S12: The gaseous working fluid of engine 30 flows from the room temperature end to the high temperature end. When it flows through the regenerator 29, it absorbs the heat stored therein, the temperature rises, and the piston returns to its original position.

[0055] Step S13: The system enters a stable operating cycle.

[0056] Table 1 below shows a set of specific experimental data from this embodiment:

[0057] Table 1 Refrigeration cycle parameters at 130℃ heat source input (gas-state working fluid pressure 6 bar)

[0058]

[0059] Therefore, this invention employs the aforementioned four-stage series double-acting liquid piston Stirling refrigeration and heating device, replacing the traditional mechanical piston with a liquid piston to solve the inherent problems of traditional Stirling refrigerators, such as working fluid leakage and maintenance difficulties. This improves the stability and reliability of the refrigeration system and greatly extends its service life. The four-stage series mechanism enables cascaded energy utilization, reducing energy consumption. It allows for switching between refrigeration and heating modes, has a simple structure, is economical and environmentally friendly, and can greatly meet the needs of daily life.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A four-stage series double-acting liquid piston Stirling refrigeration and heating device, characterized in that: The system includes an outdoor unit and an indoor unit. The indoor unit includes a chiller and a chiller, and the outdoor unit includes an engine and an engine. The high-temperature end of engine one is connected to the room-temperature end of engine two. The high-temperature end of engine two is connected to the room-temperature end of chiller one. The low-temperature end of chiller one is connected to the room-temperature end of chiller two. The low-temperature end of chiller two is connected to the room-temperature end of engine one. All of the above connections are achieved through gas pipelines. The first engine is connected to the first solar collector, and the second engine is connected to the second solar collector; The engine includes a liquid piston, which is connected to the gas pipeline. The gas pipeline is sequentially equipped with a high-temperature heat exchanger, a pressure sensor, a regenerator, and a room-temperature heat exchanger. Both the room-temperature heat exchanger and the high-temperature heat exchanger are connected to the solar collector via a heat-conducting pipeline and a three-way valve. The first refrigerator includes a third liquid piston, which is connected to the gas pipeline. The gas pipeline is sequentially provided with a third room temperature heat exchanger, a third regenerator, a first temperature sensor, and a first low temperature heat exchanger. The low-temperature end of the first refrigeration unit is located inside the first room; The room temperature heat exchanger four is located outside room one and connected to water storage tank one.

2. The four-stage series double-acting liquid piston Stirling refrigeration and heating device according to claim 1, characterized in that: The second engine includes a second liquid piston, which is connected to the gas pipeline. The gas pipeline is sequentially equipped with a second room temperature heat exchanger, a second regenerator, a second pressure sensor, and a second high temperature heat exchanger. Both the second high temperature heat exchanger and the second room temperature heat exchanger are connected to the second solar collector via a heat conduction pipeline and a three-way valve.

3. The four-stage series double-acting liquid piston Stirling refrigeration and heating device according to claim 2, characterized in that: The second refrigerator includes a liquid piston four, which is connected to the gas pipeline. The gas pipeline is sequentially provided with a room temperature end heat exchanger four, a regenerator four, a temperature sensor two, and a low temperature end heat exchanger two. The low-temperature end of the second refrigeration unit is located inside the second chamber; The room temperature heat exchanger is located outside the second room and is connected to the second water storage tank.

4. The four-stage series double-acting liquid piston Stirling refrigeration and heating device according to claim 3, characterized in that: The data from pressure sensor one, pressure sensor two, temperature sensor one, and temperature sensor two are processed synchronously through a high-speed multi-channel data acquisition device to analyze various parameters under operating conditions.

5. A four-stage series double-acting liquid piston Stirling refrigeration and heating device according to claim 4, characterized in that: The liquid piston one, the liquid piston two, the liquid piston three and the liquid piston four are all installed in the U-shaped pipeline.

6. A four-stage series double-acting liquid piston Stirling refrigeration and heating device according to claim 5, characterized in that: The U-shaped pipe and the gas pipe are connected by a flange, and the ends of the gas pipe connected to the U-shaped pipe are provided with gas chambers.

7. A four-stage series double-acting liquid piston Stirling refrigeration and heating device according to claim 6, characterized in that: The three-way valve controls the opening and closing of the heat-conducting pipeline. In summer, the high-temperature heat exchanger is connected to the solar collector, and the system performs a cooling function, with the chiller cooling room 1. In winter, the room temperature heat exchanger is connected to the solar collector, and the system performs a heating function, with the chiller heating room 1.

8. A four-stage series double-acting liquid piston Stirling refrigeration and heating device according to claim 7, characterized in that: The three-way valve 2 controls the opening and closing of the heat conduction pipeline 2. In summer, the high-temperature end heat exchanger 2 is connected to the solar collector 2, at which time the system performs the cooling function, and the chiller 2 cools room 2. In winter, the room temperature end heat exchanger 3 is connected to the solar collector 2, at which time the system performs the heating function, and the chiller 2 heats room 2.

Images