A stirling device and method of operating the same

Abstract

The application discloses a Stirling device, which comprises a first warm cavity, a first heat exchanger, a regenerator, a second heat exchanger, a second warm cavity and a discharger. The first warm cavity, the first heat exchanger, the regenerator, the second heat exchanger and the second warm cavity form a working cavity, and the working cavity contains a first fluid. The Stirling device further comprises a first elastic device closed cavity containing a second fluid, a first elastic device for isolating the first elastic device closed cavity from the working cavity, and an adjusting mechanism for adjusting the pressure in the first elastic device closed cavity. The operation method of the Stirling device is as follows: the adjusting mechanism adjusts the pressure of the second fluid in the first elastic device closed cavity, so that the compression state of the first elastic device changes, and then the volume of the working cavity changes, thereby adjusting the working pressure of the working cavity. The Stirling device has the advantages of simple structure, high reliability, stepless adjustment of the average pressure of the working medium, significant improvement of the operation efficiency, reduction of the operation cost and the like.

Description

Technical Field

[0001] This invention relates to the fields of engines, refrigeration machines, and heat pumps, and particularly to a Stirling device and its operating method. Background Technology

[0002] As an external combustion engine, the Stirling engine has advantages such as high thermal efficiency, utilization of low-grade heat energy, and low noise. It can be used as a home energy terminal to provide electricity and heat energy to the home, or it can be combined with refrigeration technology as a power source to form refrigeration equipment such as Viller-Müller cycle to provide cooling energy to the home.

[0003] Traditional Stirling engines regulate their output by adjusting the temperature of a high-temperature heat source. Therefore, under conditions of significant load variations, the temperature of this heat source can fluctuate considerably. For example, under low load conditions, the heat source temperature needs to be lowered to reduce operating frequency; under high load conditions, the heat source temperature needs to be raised to increase operating frequency. While this method of regulating engine output by adjusting the heat source temperature is simple, the low heat source temperature at low loads leads to a severe drop in efficiency, sometimes only 20%–30% of the efficiency at rated load. Furthermore, the large changes in operating frequency cause significant changes in flow and heat exchange, resulting in low overall thermal efficiency and high operating costs across all operating conditions.

[0004] Meanwhile, for equipment that combines Stirling engines with refrigeration technology, such as a double-effect Stirling unit composed of a Stirling engine and a Stirling refrigeration unit, the input power required by the refrigeration technology is related to the operating conditions. Therefore, in many cases, the frequency remains constant but the required input power varies greatly. Using traditional high-temperature heat source temperature regulation methods will lead to low efficiency of the entire system.

[0005] Moreover, in some applications, the working fluid in the Stirling unit requires pressure regulation. Pressure regulation devices based on compressors are not only costly, but also very complex. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a thermally driven Stirling device with simple structure, high reliability, stepless adjustment of the average pressure of the working fluid, thereby significantly improving operating efficiency and reducing operating costs.

[0007] The present invention further provides a method for operating the above-mentioned thermally driven Stirling device.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A Stirling device includes a first temperature chamber, a first heat exchanger, a regenerator, a second heat exchanger, a second temperature chamber, and an exhaust device. The first temperature chamber, the first heat exchanger, the regenerator, the second heat exchanger, and the second temperature chamber constitute a working chamber containing a first fluid. The Stirling device also includes a first elastic device enclosed chamber containing a second fluid, a first elastic device for isolating the first elastic device enclosed chamber from the working chamber, and a regulating mechanism for regulating the pressure inside the first elastic device enclosed chamber.

[0010] As a further improvement to the above technical solution: the first elastic device is a bellows, one end of which is fixed and the other end is a free end; or, the first elastic device is a diaphragm.

[0011] As a further improvement to the above technical solution: an on / off valve is also provided between the first elastic device and the working chamber, for controlling the connection and disconnection between the first fluid in the working chamber and the first fluid in the first elastic device.

[0012] As a further improvement to the above technical solution: the volume of the first elastic device in the free state is 0.5 to 100 times the scavenging volume of the exhaust device.

[0013] As a further improvement to the above technical solution: the second fluid is a liquid lubricant.

[0014] As a further improvement to the above technical solution: the regulating mechanism includes a pump assembly and a control valve.

[0015] As a further improvement to the above technical solution, it also includes a piston, a second elastic device closed cavity containing a second fluid, and a second elastic device for isolating the second elastic device closed cavity from the working cavity. One end of the second elastic device is fixed and the other end is connected to the piston. The first elastic device closed cavity is in communication with the second elastic device closed cavity, and the adjustment mechanism is connected to the second elastic device closed cavity.

[0016] And / or, it also includes a third elastic device enclosure containing a second fluid, and a third elastic device for isolating the third elastic device enclosure from the working chamber, one end of the third elastic device being fixed and the other end being connected to the discharge device, the first elastic device enclosure communicating with the third elastic device enclosure, and the adjustment mechanism being connected to the third elastic device enclosure.

[0017] As a further improvement to the above technical solution, it also includes a fourth elastic device enclosure containing a second fluid, and a fourth elastic device for isolating the fourth elastic device enclosure from the working chamber. One end of the fourth elastic device is fixed and the other end is a free end. The second elastic device enclosure and / or the third elastic device enclosure are in communication with the fourth elastic device enclosure.

[0018] As a further improvement to the above technical solution: the control valve between the pump assembly and the first elastic device enclosure is an electrically controlled valve, and the control valves between the second elastic device enclosure and the pump assembly, the third elastic device enclosure and the pump assembly, and the fourth elastic device enclosure and the pump assembly are all adaptive valves.

[0019] As a further improvement to the above technical solution, it also includes a transmission mechanism and an electromagnetic device, wherein the piston and / or the discharger are connected to the transmission mechanism, and the electromagnetic device is connected to the transmission mechanism.

[0020] One method for operating the Stirling device described above involves adjusting the pressure of the second fluid within the closed cavity of the first elastic device by an adjusting mechanism, thereby changing the compression state of the first elastic device and consequently changing the volume of the working cavity, thus adjusting the working pressure of the working cavity.

[0021] Compared with the prior art, the advantages of the present invention are as follows: The Stirling device disclosed in the present invention can adjust the volume of the first elastic device by controlling the pressure of the second fluid in the closed cavity of the first elastic device through the adjustment mechanism. Since one side of the first elastic device is in contact with the working medium, i.e., the first fluid, in the working chamber, the change in the volume of the first elastic device can change the total volume of the working chamber, thereby changing the average pressure in the working chamber. At the same time, since the working medium in the working chamber and the second fluid are isolated by the first elastic device, there will be no contamination of the working medium in the working chamber. Moreover, the first elastic device can withstand a small pressure difference under the action of the adjustment mechanism, achieving long service life and high reliability. Therefore, the structure is simple, the cost is low, the reliability is good, the adjustment is convenient, and the efficiency of the Stirling device under non-rated operating conditions is improved.

[0022] The Stirling device operation method disclosed in this invention can control the volume of the first elastic device by controlling the pressure applied by the regulating mechanism, thereby adjusting the working chamber volume according to the load requirements. The method is simple and convenient. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a first embodiment of the thermally driven Stirling device of the present invention.

[0024] Figure 2 This is a schematic diagram of the elastic device in this invention.

[0025] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the thermally driven Stirling device of the present invention.

[0026] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the thermally driven Stirling device of the present invention.

[0027] The labels in the diagram represent: 1. First temperature chamber; 2. First heat exchanger; 3. Regenerator; 4. Second heat exchanger; 5. Second temperature chamber; 6. Discharge device; 7. Piston; 8. Cylinder; 91. First elastic device; 92. Second elastic device; 93. Third elastic device; 94. Fourth elastic device; 10. Adjustment mechanism; 101. First adjustment mechanism; 102. Second adjustment mechanism; 11. Control valve; 111. First control valve; 112. Second control valve; 113. Check valve; 12. Pump assembly; 121. First pump assembly; 122. Second pump assembly; 131. First elastic device closed chamber; 132. Second elastic device closed chamber; 133. Third elastic device closed chamber; 134. Fourth elastic device closed chamber; 14. Second fluid chamber; 15. Transmission mechanism; 16. Electromagnetic device; 17. On / off valve. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] like Figure 1 As shown, the Stirling device of the present invention includes a first temperature chamber 1 (e.g., a high-temperature chamber), a first heat exchanger 2 (e.g., a high-temperature heat exchanger), a regenerator 3, a second heat exchanger 4 (e.g., a low-temperature heat exchanger), a second temperature chamber 5 (e.g., a low-temperature chamber), an exhaust device 6, a piston 7, and a cylinder 8. The first temperature chamber 1, the first heat exchanger 2, the regenerator 3, the second heat exchanger 4, and the second temperature chamber 5 constitute a working chamber.

[0031] Furthermore, it also includes a first elastic device 91, such as Figure 2 As shown, the first elastic device can be a diaphragm or a bellows. Since the diaphragm has a small stroke and requires a large diameter, this results in a large device size and heavy weight. Preferably, the first elastic device is a bellows, and the material can be rubber or metal. Because rubber has a lifespan degradation characteristic, the first elastic device is preferably made of metal. When the first elastic device 91 is a metal bellows, the metal bellows can be a welded bellows, a hydroformed bellows, or an electrodeposited bellows. Preferably, the metal bellows is a welded bellows or a hydroformed bellows. The metal bellows structure can be S-shaped, V-shaped, Ω-shaped, or U-shaped, etc. Figure 2 a and Figure 2 b shows two types of bellows structures. Figure 2 'a' is V-shaped. Figure 2 b is S-shaped. Figure 2 b is a welded corrugated pipe with welds on both the inside and outside. Figure 2 c and Figure 2 Figure d illustrates two structures of metal diaphragms. Further, Figure 2e illustrates an elastic device composed of a metal bellows and a metal diaphragm. Preferably, the first elastic device 91 is an elastic device composed of a metal bellows and a metal diaphragm, with the metal bellows having a metal diaphragm at one end, forming a semi-closed cavity. The structure and materials of the second elastic device 92, the third elastic device 93, and the fourth elastic device 94 can be referred to those of the first elastic device 91, and will not be described again.

[0032] Furthermore, it also includes a first fluid, a second fluid, and a second fluid cavity 14. The working cavity is filled with the first fluid, that is, the first fluid is the working medium of the working cavity. Preferably, the first fluid is a gas such as helium, hydrogen, or air. The second fluid is a liquid lubricant, which plays a lubricating role while regulating pressure and reducing friction between components. It should be noted that the second fluid cavity 14 may also contain the first fluid. The working medium of the working cavity and the second fluid cavity are different, not only in terms of the type of working medium but also in the proportion of their components.

[0033] Furthermore, the first elastic device 91 has surfaces that are in contact with the first fluid and the second fluid respectively. The working chamber and the working fluid in the first elastic device closed chamber 131 are isolated by the first elastic device to prevent mixing between the working chamber and the working fluid in the first elastic device closed chamber 131, especially to prevent the second fluid from flowing into the working chamber and contaminating the heat exchanger or regenerator.

[0034] Furthermore, the first elastic device 91 is in a free state at one end and fixed at the other. To prevent the second fluid from entering the working chamber, the free end of the bellows is closed, such as... Figure 2 As shown in e, the closed end can also be a flat plate.

[0035] Furthermore, it also includes an adjustment mechanism 10. Since one end of the first elastic device 91 is in a free state, the adjustment mechanism 10 can move the free end of the first elastic device 91, thereby changing the volume of the first elastic device 91. The adjustment mechanism 10 can be a direct force-providing adjustment mechanism, such as a motor directly connected to the free end of the first elastic device 91, moving the free end under the driving force of the motor; or it can be an indirect force-providing adjustment mechanism, such as a hydraulic device, moving the free end of the first elastic device 91 through the transmission of working fluid pressure. Preferably, the adjustment mechanism 10 is a force-transmitting adjustment mechanism that uses working fluid pressure.

[0036] like Figure 1 As shown, when a larger load output from the Stirling device is required, the average operating pressure of the Stirling device can be increased to increase the output load. The first elastic device 91 is a metal bellows. Since one side of the metal bellows is in contact with the working fluid inside the working chamber, by applying force to compress the length of the metal bellows, the volume of the working chamber can be reduced. Figure 1The regulating mechanism 10 shown is a hydraulic regulating mechanism. It pumps a second fluid into the closed cavity 131 of the first elastic device, causing an increase in pressure within the cavity 131. This, in turn, pushes the metal bellows to shorten, reducing the working chamber volume and increasing the average pressure within the working chamber, thereby increasing the output load of the Stirling device. Figure 1 As shown in b. Conversely, when a smaller load output from the Stirling unit is required, the average operating pressure of the Stirling unit can be reduced to decrease the output load, such as... Figure 1 As shown in Figure a, the first elastic device closed cavity 131 pumps out the second fluid, causing the pressure inside the first elastic device closed cavity 131 to decrease, thereby pushing the metal bellows to extend, increasing the working cavity volume, reducing the average pressure of the working cavity, and thus reducing the output load of the Stirling device. Figure 1 c illustrates a structure in which a bellows extends into the working chamber to increase the average pressure in the working chamber.

[0037] Furthermore, to allow for a wider range of adjustment of the working chamber volume, the volume of the first elastic device 91 in its free state is 0.5-100 times the scavenging volume of the discharger 6. The volume of the first elastic device 91 determines the range of change in the working chamber volume. Preferably, in the free state, the volume of the first elastic device 91 is 1-20 times the scavenging volume of the discharger 6. The scavenging volume of the discharger 6 is the product of the discharger area and the discharger stroke, approximately equal to the volume of the first warm chamber 1, where the discharger area is calculated based on the discharger's outer diameter. The free state refers to the state of the first elastic device without applied force. When the elastic device is a jointed device, the joint needs to be removed to eliminate the influence of gravity generated by the joint's weight on the volume of the elastic device. For the volume of the first elastic device based on a metal bellows, as... Figure 2 As shown in f, this refers to the volume occupied by the second fluid in the internal free state. Furthermore, the volume of the first elastic device based on a metal diaphragm is calculated as follows: Figure 2 As shown in g.

[0038] like Figure 1 As shown, the volume of the first elastic device 91 communicating with the working cavity constitutes the dead volume of the Stirling device, which may reduce the efficiency or capability of the Stirling device. To eliminate the impact of the dead volume of the first elastic device 91 communicating with the working cavity on the performance of the Stirling device, as follows... Figure 1As shown in Figure a, an on / off valve 17 is installed on the connecting pipeline between the first elastic device 91 and the working chamber. The on / off valve 17 can be an electrically controlled valve, a pneumatic valve, or a mechanical valve, etc. When the first elastic device 91 is controlled to a set volume, the on / off valve 17 can be used to close the connection between the working fluid in the first elastic device 91 and the working fluid in the working chamber, thus reducing the dead volume of the Stirling device. When it is necessary to regulate the average pressure in the working chamber, the flow between the working fluid in the first elastic device 91 and the working fluid in the working chamber can be opened through the on / off valve 17. After the average pressure regulation in the working chamber is completed, it can be decided whether to continue to open or close the on / off valve 17 as needed. This is because retaining a certain dead volume under some application conditions can reduce the pressure ratio, thereby improving performance.

[0039] Furthermore, during operation, the pressure inside the working chamber fluctuates periodically. This periodic pressure fluctuation will generate periodic stress on the working fluid side of the first elastic device 91, which may easily lead to stress caused by an internal and external pressure difference in the first elastic device 91, thereby reducing the reliability of the first elastic device 91. When the volume inside the working chamber reaches the set target through the first elastic device 91, the flow between the working fluid inside the first elastic device 91 and the working fluid in the working chamber is closed by the on / off valve 17. This can reduce the pressure difference fluctuation that the first elastic device 91 is subjected to and improve the life of the first elastic device 91.

[0040] Example 2

[0041] Based on Embodiment 1, the Stirling device in this embodiment further includes a second elastic device 92. For example... Figure 3 As shown, the second elastic device 92 is located inside the closed cavity 132 of the second elastic device. The second elastic device 92 is connected to the piston 7. The other structures of the second elastic device 92 are similar to those of the first elastic device.

[0042] The second elastic device's enclosed cavity 132 is filled with a liquid second fluid. During the movement of the piston 7, since the second fluid is incompressible, the volume change that may occur within the second elastic device's enclosed cavity 132 will cause a pressure difference between the inside and outside of the second elastic device 92, thereby generating stress within the second elastic device. Therefore, the second elastic device's enclosed cavity 132 can be connected to the first elastic device's enclosed cavity 131. Since the free end of the first elastic device can move freely within the working chamber, when the volume of the second elastic device's enclosed cavity 132 shrinks or expands during the movement of the piston 7, causing the liquid second fluid to flow into or out of the second elastic device's enclosed cavity 132, the flowing liquid can be replenished or offset by the movement of the free end of the first elastic device's enclosed cavity 131.

[0043] Furthermore, it also includes a third elastic device 93, which is located within the third elastic device enclosed cavity 133 and is connected to the discharge device 6. The other structures of the third elastic device 93 are similar to those of the second elastic device 92.

[0044] The third elastic device's enclosed cavity 133 is filled with a liquid second fluid. During the movement of the discharge device 6, because the second fluid is incompressible, the volume changes that may occur within the third elastic device's enclosed cavity 133 will cause a pressure difference between the inside and outside of the third elastic device's enclosed cavity 133, thereby generating stress within the third elastic device. Therefore, the third elastic device's enclosed cavity 133 can be connected to the first elastic device's enclosed cavity 131. Since one end of the first elastic device can move freely within the working chamber, when the volume of the third elastic device's enclosed cavity 133 shrinks or expands during the movement of the discharge device 6, causing the liquid second fluid to flow into or out of the third elastic device's enclosed cavity 133, the flowing liquid can be replenished or offset by the movement of the free end of the first elastic device's enclosed cavity 131.

[0045] Furthermore, the regulating mechanism 10 includes a pump assembly 12 for pressurizing the second fluid and a control valve 11. The power source for the pump assembly 12 can be the piston 7 or an electric motor; preferably, the power source for the pump assembly 12 is the piston 7, such as... Figure 4 As shown, the second fluid is pressurized to a high pressure by the pump assembly 12 and injected into the closed cavities of each elastic device. Further, each closed cavity of the elastic device has a control valve 11 to control the inflow of fluid. Preferably, the control valve 11 can be an electrically controlled valve or an adaptive valve. Preferably, the control valve 11 in the first regulating mechanism 101 acting on the first elastic device 91 is an electrically controlled valve, which can determine the pumping of the second fluid according to load requirements. The control valve 11 acting on other regulating mechanisms is an adaptive valve, the specific structure of which is shown below. Figure 3 As shown in b.

[0046] In some cases, such as when leakage of the working fluid in the working chamber causes a significant drop in the average pressure within the working chamber, or when different working fluids in the second fluid chamber 14 lead to significant pressure variations under different operating conditions, a large pressure difference may arise between the working chamber and the second fluid chamber 14. This results in the second elastic device 92 and the third elastic device 93 bearing stress from the large pressure difference when the Stirling device is not in operation or is shut down. In this situation, because the first elastic device 91 has a large variable volume adjustment, its volume is compressed under the pressure of the second fluid chamber 14, increasing the pressure in the working chamber. Therefore, the large variable volume of the first elastic device 14 can adjust the pressure in the working chamber over a wide range, reducing the pressure difference between the working chamber and the second fluid chamber 14 in the shutdown state, and protecting the second elastic device 92 and the third elastic device 93 from damage in the shutdown state.

[0047] Example 3

[0048] Based on Embodiment 2, the Stirling device in this embodiment further includes a fourth elastic device 94, such as... Figure 3 As shown, one end of the fourth elastic device 94 is in a free state, and the other end is fixed. Preferably, the free end of the fourth elastic device 94 can move within the working chamber. Similarly, the fourth elastic device 94 is located within the fourth elastic device closed cavity 134, which isolates the working chamber from the second fluid cavity 14. The fourth elastic device closed cavity 134 communicates with the second elastic device closed cavity 132 or the third elastic device closed cavity 133, and is used to control pressure changes within the second elastic device closed cavity 132 or the third elastic device closed cavity 133. Figure 3 As shown, the fourth elastic device closed cavity 134 is connected to the second elastic device closed cavity 132. Therefore, during the movement of the piston 7, the pressure change caused by the change in the volume of the second elastic device closed cavity 132 can be offset by the change in the volume of the fourth elastic device closed cavity 134, so that the pressure difference inside and outside the second elastic device 92 is small during the piston movement.

[0049] It should be noted that the first elastic device 91 and the fourth elastic device 94 are structurally similar, and the closed cavities 131 and 134 of the first elastic device can also communicate with the closed cavities 132 and 133 of the second and third elastic devices, respectively. However, they differ in function: the function of the fourth elastic device 94 is to compensate for the volume changes of the second elastic device 92 or the third elastic device 93, which are usually small. The first elastic device 91 is mainly used to regulate the working volume of the working chamber. Therefore, the diameter and length of the fourth elastic device are usually smaller, and the volume is smaller, while the diameter and / or length of the first elastic device 91 are larger, and the volume is larger. In this invention, the volume of the first elastic device in the free state is 0.5 to 100 times the scavenging volume of the exhaust device. Preferably, the volume of the first elastic device in the free state is 1 to 20 times the scavenging volume of the exhaust device. The larger volume of the first elastic device 91 lays the foundation for its adjustment of the average pressure of the working chamber. Its volume change can lead to a ratio of the maximum to the minimum average pressure of the working chamber ≥ 110% at room temperature.

[0050] The control valve 11 that controls the closed cavity 132 of the second elastic device or the closed cavity 133 of the fourth elastic device can be an adaptive valve. The adaptive control valve 11 can automatically open and close according to the pressure difference between the closed cavity of the elastic device and the working cavity, thereby reducing the control requirements and maintaining the pressure difference between the inside and outside of the elastic device within a low range.

[0051] Furthermore, Figure 3Figure b shows a schematic diagram of an adaptive valve. One end of the adaptive valve is connected to a fourth elastic device 94, while the other end moves freely. When the pressure in the working chamber is higher than the closed chamber 134 of the fourth elastic device, the fourth elastic device 94 is compressed, and the adaptive valve moves downward under the action of the fourth elastic device 94. The pipeline between the closed chamber 134 of the fourth elastic device and the pump assembly 12 is connected, and the second fluid is pumped into the closed chamber 134 of the fourth elastic device. The fourth elastic device 94 begins to gradually elongate, and the adaptive valve moves upward under the action of the fourth elastic device 94. When the volume of the fourth elastic device 94 increases to a certain value, the pipeline between the closed chamber 134 of the fourth elastic device and the pump assembly 12 is disconnected. Furthermore, to prevent the second fluid from flowing back, a check valve is installed on the pipeline between the adaptive valve and the pump assembly 12.

[0052] Furthermore, it also includes a transmission mechanism 15, to which the piston 7 and / or the discharger 6 are connected. The piston-connected transmission mechanism can be connected to power-consuming or power-inputting components, such as motors, via the crankshaft of the transmission mechanism. The piston 7 and the discharger 6 are connected to the transmission mechanism 15 together, which can maintain a fixed motion phase between the piston 7 and the discharger 6.

[0053] Furthermore, it also includes an electromagnetic device 16, which can drive the transmission mechanism 15 to move or output electrical power. Preferably, the electromagnetic device 16 is a generator and is connected to the transmission mechanism 15, such as... Figure 4 As shown.

[0054] Furthermore, the piston 7 can be a piston that transmits work based on a rod, or a piston that transmits work based on a diaphragm and fluid.

[0055] Furthermore, the control valve 11 includes a first control valve 111 and a second control valve 112, wherein the power source for the pump assembly 12 comes from the piston 7, such as... Figure 4 As shown, the pump assembly 12 can determine whether to compress the second fluid by controlling the opening and closing of the second control valve 112. The pump assembly 12 pressurizes the second fluid to a high pressure and injects it into the closed chambers 131, 132, and 133 of the first elastic device, thereby adjusting the pressure difference between the inside and outside of the relevant elastic devices.

[0056] Example 4

[0057] The above-described operating method for the Stirling device allows for adjustment of its operating pressure. The specific control process is as follows:

[0058] When a low working chamber pressure is required, the force applied by the adjustment mechanism 10 associated with the first elastic device 91, such as... Figure 1As shown in Figure a, at this time, the pump assembly 12 is in a non-pressurized fluid state, reducing the force of the regulating mechanism, so that there is less liquid second fluid in the closed cavity 131 of the first elastic device. Under the pressure of the working cavity, the first elastic device 91 is in a larger volume state, thereby making the working cavity volume larger and reducing the working pressure of the working cavity.

[0059] When a high working chamber pressure is required, the force applied by the adjustment mechanism 10 associated with the first elastic device 91, such as... Figure 1 As shown in b, at this time, the pump assembly 12 is in a pressurized fluid state, increasing the force of the regulating mechanism, which causes the liquid second fluid in the closed cavity 131 of the first elastic device to increase. Under the pressurization effect of the pump assembly 12, the first elastic device 91 is in a smaller volume state, thereby making the working cavity volume smaller and increasing the working pressure of the working cavity.

[0060] Furthermore, when a low load is required during operation, the output load can be reduced by decreasing the working chamber pressure; when a high load is required during operation, the output load can be increased by increasing the working chamber pressure.

[0061] Furthermore, before adjusting the working chamber pressure, the device has the ability to detect the working chamber pressure or volume or, based on the magnitude of the working chamber pressure from the output load feedback system, provide a target value for controlling the working chamber pressure.

[0062] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A Stirling device comprising a first temperature chamber (1), a first heat exchanger (2), a regenerator (3), a second heat exchanger (4), a second temperature chamber (5), and an exhaust device (6), wherein the first temperature chamber (1), the first heat exchanger (2), the regenerator (3), the second heat exchanger (4), and the second temperature chamber (5) constitute a working chamber, the working chamber containing a first fluid, characterized in that: The Stirling device also includes a first elastic device enclosed cavity (131) containing a second fluid, a first elastic device (91) for isolating the first elastic device enclosed cavity (131) from the working cavity, and an adjustment mechanism (10) for adjusting the pressure inside the first elastic device enclosed cavity (131). By controlling the pressure of the second fluid inside the first elastic device enclosed cavity (131) through the adjustment mechanism (10), the volume of the first elastic device (91) can be adjusted. The change in the volume of the first elastic device (91) can change the total volume of the working cavity, thereby changing the average pressure inside the working cavity.

2. The Stirling device according to claim 1, characterized in that: The first elastic device (91) is a bellows, with one end fixed and the other end free; or, the first elastic device (91) is a diaphragm.

3. The Stirling apparatus according to claim 1, characterized in that: A switch valve (17) is also provided between the first elastic device (91) and the working chamber to control the connection and disconnection of the first fluid in the working chamber and the first fluid in the first elastic device (91).

4. The Stirling apparatus according to claim 1, characterized in that: In its free state, the volume of the first elastic device (91) is 0.5 to 100 times the scavenging volume of the discharger (6).

5. The Stirling apparatus according to claim 1, characterized in that: The second fluid is a liquid lubricant.

6. The Stirling apparatus according to any one of claims 1 to 5, characterized in that: The regulating mechanism (10) includes a pump assembly (12) and a control valve (11).

7. The Stirling apparatus according to claim 6, characterized in that: It also includes a piston (7), a second elastic device closed cavity (132) containing a second fluid, and a second elastic device (92) for isolating the second elastic device closed cavity (132) from the working cavity. One end of the second elastic device (92) is fixed and the other end is connected to the piston (7). The first elastic device closed cavity (131) is connected to the second elastic device closed cavity (132). The adjusting mechanism (10) is connected to the second elastic device closed cavity (132). And / or, it also includes a third elastic device enclosure (133) containing a second fluid, and a third elastic device (93) for isolating the third elastic device enclosure (133) from the working chamber, one end of the third elastic device (93) being fixed and the other end being connected to the discharger (6), the first elastic device enclosure (131) being in communication with the third elastic device enclosure (133), and the adjustment mechanism (10) being connected to the third elastic device enclosure (133).

8. The Stirling apparatus according to claim 7, characterized in that: It also includes a fourth elastic device enclosure (134) containing a second fluid, and a fourth elastic device (94) for isolating the fourth elastic device enclosure (134) from the working chamber. One end of the fourth elastic device (94) is fixed and the other end is a free end. The second elastic device enclosure (132) and / or the third elastic device enclosure (133) are connected to the fourth elastic device enclosure (134).

9. The Stirling apparatus according to claim 8, characterized in that: The control valve (11) between the pump assembly (12) and the first elastic device enclosure (131) is an electrically controlled valve. The control valves (11) between the second elastic device enclosure (132) and the pump assembly (12), the third elastic device enclosure (133) and the pump assembly (12), and the fourth elastic device enclosure (134) and the pump assembly (12) are all adaptive valves.

10. The Stirling apparatus according to claim 7, characterized in that: It also includes a transmission mechanism (15) and an electromagnetic device (16), wherein the piston (7) and / or the discharger (6) are connected to the transmission mechanism (15) and the electromagnetic device (16) are connected to the transmission mechanism (15).

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