Free piston Stirling generator frequency adjusting device and Stirling generator experiment system

Abstract

The utility model relates to the field of generators, and provides a free piston Stirling generator frequency adjusting device and a Stirling generator experiment system. And the frequency modulation assembly is in rigid connection with the free piston Stirling generator, and the frequency modulation assembly is used for generating a preset target frequency, so that the operation frequency of the free piston Stirling generator reaches the preset target frequency. Thus, the free piston Stirling generator can operate at a certain frequency after being designed and assembled, and if the operation frequency of the free piston Stirling generator needs to be changed in actual use, the frequency modulation assembly can be started, so that the frequency modulation assembly operates according to the preset target frequency. Due to the fact that the frequency modulation assembly in the device is in rigid connection with the free piston Stirling generator, vibration of the frequency modulation assembly can be transmitted to the free piston Stirling generator, and the operation frequency of the self-adaptive free piston Stirling generator can be adjusted to the preset target frequency. Therefore, the purpose of adjusting the running frequency of the free piston Stirling generator on line is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of generators, in particular to a free piston Stirling generator frequency regulating device and a Stirling generator experimental system. Background Art

[0002] The operating frequency is a key parameter of the free piston Stirling generator, which directly affects the performance and output characteristics of the generator. There are many factors that affect the frequency and they are very complex, mainly including the dynamic mass of the generator piston, spring stiffness, inflation pressure, load, etc. In theory, the operating frequency of the generator can be accurately designed, but in reality, due to model accuracy, parts processing accuracy, assembly, etc., there is a large difference between the actual operating frequency of the generator and the design frequency. At the same time, the frequency of the generator will also change with the change of output power.

[0003] The frequency gap and instability caused by the above reasons will affect the power conversion equipment and loads. For example, when the free piston Stirling generator is used in the space power system, the AC power output by the Stirling generator needs to be converted into DC power. If the operating frequency of the generator is unstable, it will be very difficult to convert AC to DC. In addition, when the free piston Stirling generator is used for ground solar power generation, the power grid requires that the frequency of the AC power must be precisely 50Hz in order to be connected to the grid. If the generator frequency cannot be accurately controlled as required, the power generated by the generator will not be effectively used.

[0004] In short, various needs require that the operating frequency of the free piston Stirling generator be stable and accurately controlled, but currently the frequency can only be adjusted by changing the structural parameters and operating parameters of the generator. However, once the generator is designed and assembled, its operating frequency is fixed and cannot be changed in actual use. Utility Model Content

[0005] The utility model aims to provide a free piston Stirling generator frequency regulating device and a Stirling generator experimental system, so as to at least solve one of the problems existing in the prior art.

[0006] In order to achieve the above object, the utility model provides a free piston Stirling generator frequency regulating device, comprising:

[0007] Free-piston Stirling generator;

[0008] A frequency modulation component is rigidly connected to the free piston Stirling generator, and the frequency modulation component is used to generate a preset target frequency so that the operating frequency of the free piston Stirling generator reaches the preset target frequency.

[0009] According to the free piston Stirling generator frequency regulating device provided by the utility model, the frequency regulating component includes:

[0010] A frequency-modulating motor, rigidly connected to the free-piston Stirling generator, the frequency-modulating motor being used to form the preset target frequency;

[0011] A frequency controller is electrically connected to the frequency-modulated motor, and is used to control the frequency of the frequency-modulated motor.

[0012] According to the free piston Stirling generator frequency regulating device provided by the utility model, the frequency controller is an adjustable power supply, the adjustable power supply is electrically connected to the frequency modulation motor, and the adjustable power supply is used to adjust the supply voltage of the frequency modulation motor.

[0013] According to the free piston Stirling generator frequency regulating device provided by the utility model, the frequency modulation motor includes a first shell, the free piston Stirling generator includes a second shell, and the first shell is rigidly connected to the second shell.

[0014] According to the free piston Stirling generator frequency regulating device provided by the utility model, the first shell and the second shell are connected by welding or by a bolt assembly.

[0015] The free piston Stirling generator frequency regulating device provided by the utility model also includes:

[0016] A load is electrically connected to the free-piston Stirling generator.

[0017] According to the free piston Stirling generator frequency regulating device provided by the utility model, the load is an adjustable resistor.

[0018] The free piston Stirling generator frequency regulating device provided by the utility model also includes:

[0019] A heater is sleeved on the free piston Stirling generator, and the heater is used to heat the hot end of the free piston Stirling generator.

[0020] The free piston Stirling generator frequency regulating device provided by the utility model also includes:

[0021] A cooler is sleeved on the free piston Stirling generator, and the cooler is used to cool the cold end of the free piston Stirling generator.

[0022] The utility model also provides a Stirling generator experimental system, comprising the free piston Stirling generator frequency regulating device as described in any one of the above items.

[0023] The free piston Stirling generator frequency regulating device provided by the utility model comprises: a free piston Stirling generator; a frequency modulation component rigidly connected to the free piston Stirling generator, and the frequency modulation component is used to generate a preset target frequency so that the operating frequency of the free piston Stirling generator reaches the preset target frequency. With such a configuration, the free piston Stirling generator will operate at a certain frequency after being designed and assembled. If its operating frequency needs to be changed during actual use, the frequency modulation component can be turned on to make the frequency modulation component operate according to the preset target frequency. Since the frequency modulation component in the device is rigidly connected to the free piston Stirling generator, the vibration of the frequency modulation component will be transmitted to the free piston Stirling generator, and the operating frequency of the adaptive free piston Stirling generator will also be adjusted to the preset target frequency, thereby achieving the purpose of online regulating the operating frequency of the free piston Stirling generator, solving the problems that the design frequency of the existing free piston Stirling generator has a deviation from the target frequency, the operating frequency changes with the load, and the frequency cannot be adjusted online. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of a frequency regulating device for a free piston Stirling generator provided by an embodiment of the utility model;

[0026] Reference numerals:

[0027] 1: Heater; 2: Cooler; 3: Free piston Stirling generator; 4: Frequency modulation motor; 5: Adjustable power supply; 6: Load. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In the prior art, once the free piston Stirling generator is assembled, its operating frequency characteristics are fixed and cannot be adjusted online. In addition, there is a certain gap between the actual operating frequency of the generator and the design frequency. At the same time, the operating frequency of the generator will change with the output power and the load. Its frequency is unstable and cannot meet the actual application requirements.

[0032] Therefore, the utility model provides a free piston Stirling generator frequency regulating device, which can online steplessly adjust the operating frequency of the free piston Stirling generator, thereby eliminating frequency gaps and instability and meeting the use requirements of various application occasions.

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] Please refer to Figure 1As shown, an embodiment of the utility model provides a free piston Stirling generator frequency regulating device, including a free piston Stirling generator 3 and a frequency modulation component. Specifically, the frequency modulation component is rigidly connected to the free piston Stirling generator 3, and the frequency modulation component is used to generate a preset target frequency so that the operating frequency of the free piston Stirling generator 3 reaches the preset target frequency. Since the free piston Stirling generator 3 and the frequency modulation component are rigidly connected, it means that the connection between them is fixed and there is no relative movement. The frequency modulation component is used to generate a preset target frequency, which is set based on the needs of the system, such as to match the frequency of the power grid, optimize the power generation efficiency or meet specific load requirements. Therefore, the frequency modulation component works at a preset target frequency, and based on the fixed connection between the two, its vibration will be reliably transmitted to the free piston Stirling generator 3. The free piston Stirling generator 3 includes a power piston vibration system and a gas distribution piston vibration system. Under the vibration intervention of the frequency modulation component, the power piston vibration system and the gas distribution piston vibration system are adaptively adjusted, and the generator operating frequency is finally adjusted to be consistent with the preset target frequency.

[0035] With such a configuration, the free piston Stirling generator 3 will run at a certain frequency after being designed and assembled. If its operating frequency needs to be changed during actual use, the frequency modulation component can be turned on to make the frequency modulation component run according to the preset target frequency. Since the frequency modulation component in the device is rigidly connected to the free piston Stirling generator 3, the vibration of the frequency modulation component will be transmitted to the free piston Stirling generator 3, and the operating frequency of the free piston Stirling generator 3 will also be adjusted to the preset target frequency after self-adaptation, thereby achieving the purpose of online adjustment of the operating frequency of the free piston Stirling generator 3, solving the problems of deviation between the design frequency and the target frequency of the existing free piston Stirling generator, change of the operating frequency with load changes, and inability to adjust the frequency online.

[0036] In general, the frequency regulation device of the free piston Stirling generator achieves precise control of the operating frequency of the generator through the close cooperation between the frequency modulation component and the generator. This not only improves the operating efficiency and stability of the generator, but also enables the generator to better adapt to various complex working environments and load changes. With the continuous advancement of science and technology and the continuous expansion of application fields, this device is expected to play an important role in more fields.

[0037] In the embodiment of the utility model, the frequency modulation component includes a frequency modulation motor 4 and a frequency controller. Specifically, Figure 1As shown, the frequency modulation motor 4 is rigidly connected to the free piston Stirling generator 3, and the frequency modulation motor 4 is used to form a preset target frequency. The frequency controller is electrically connected to the frequency modulation motor 4, and the frequency controller is used to control the frequency of the frequency modulation motor 4. In this way, through the coordinated use of the frequency modulation motor 4 and the frequency controller, the operating frequency of the frequency modulation motor 4 can be changed according to different application requirements, thereby realizing arbitrary adjustment of the operating frequency of the free piston Stirling generator 3, which is flexible and convenient to operate and has a wider range of applications.

[0038] Furthermore, in the embodiment of the utility model, the frequency controller is an adjustable power supply 5, the adjustable power supply 5 is electrically connected to the frequency-modulated motor 4, and the adjustable power supply 5 is used to adjust the supply voltage of the frequency-modulated motor 4. In this configuration, by adjusting the output voltage of the adjustable power supply 5, the supply voltage of the frequency-modulated motor 4 connected thereto can be adjusted, thereby changing the operating frequency of the frequency-modulated motor 4 to make it operate at a preset target frequency, and the cost is relatively low.

[0039] Of course, in other embodiments, in order to achieve this goal, the frequency modulation component can adopt other technical means. For example, a pulse width modulation (PWM) speed modulation method can be used to change the speed of the frequency modulation motor 4, thereby changing the frequency of the frequency modulation motor 4. Alternatively, a variable frequency speed modulation method can be used to change the speed of the frequency modulation motor 4, thereby changing the frequency of the frequency modulation motor 4.

[0040] In an optional embodiment of the utility model, the frequency-modulated motor 4 includes a first housing, the free piston Stirling generator 3 includes a second housing, and the first housing is rigidly connected to the second housing. In this arrangement, by rigidly connecting the first housing and the second housing, a relatively stable overall structure is formed, which helps to reliably transmit the vibration of the frequency-modulated motor 4 to the free piston Stirling generator 3, and is easy to operate and install.

[0041] In a specific embodiment of the utility model, the first shell and the second shell are connected by welding or by a bolt assembly. The welding connection method is adopted, and the connection is more secure, and no connector is required, which simplifies the structure. The bolt connection method is easy to disassemble and assemble, and can be disassembled and reassembled when necessary, which is convenient for maintenance and replacement of parts. When selecting a connection method, it is necessary to comprehensively consider factors such as the application scenario of the equipment, load requirements, maintenance requirements, and cost. Of course, in other embodiments, the first shell and the second shell can also be rigidly connected by mechanical locking or fastening elements to connect the two into a whole.

[0042] As an optional embodiment of the present invention, the free piston Stirling generator frequency regulating device further comprises a load 6, which is electrically connected to the free piston Stirling generator 3. Such an arrangement forms a load excitation system, which can ensure that the free piston Stirling generator 3 can start normally.

[0043] Furthermore, in the embodiment of the utility model, the load 6 is an adjustable resistor. With such a configuration, the resistance value of the load resistor can be adjusted according to the operation of the free piston Stirling generator 3, and the system changes can be quickly responded to, so as to better meet the operating frequency adjustment requirements of the free piston Stirling generator 3.

[0044] In an optional embodiment of the utility model, the frequency regulating device of the free piston Stirling generator further includes a heater 1, which is sleeved on the free piston Stirling generator 3 and is used to heat the hot end of the free piston Stirling generator 3. In this arrangement, by increasing the temperature of the hot end, the temperature difference in the Stirling cycle can be increased, thereby improving the working efficiency of the generator, optimizing the working conditions of the Stirling cycle, and enabling the generator to operate in a more efficient state.

[0045] As an embodiment of the utility model, the frequency regulating device of the free piston Stirling generator also includes a cooler 2, which is sleeved on the free piston Stirling generator 3, and the cooler 2 is used to cool the cold end of the free piston Stirling generator 3. In this way, by effectively dissipating heat, the cooler 2 can ensure that the cold end is maintained at a relatively low and stable temperature, thereby forming a sufficient temperature difference with the hot end, thereby improving the efficiency of the Stirling cycle, so that the generator can operate under more consistent working conditions, and improve the stability of its operating frequency. The cooler 2, the heater 1, the frequency modulation component, and other components such as the adjustable resistor together constitute a complete frequency regulating device, and these components work together to achieve the regulation and optimization of the generator operating frequency by accurately controlling the temperature of the hot end and the cold end of the Stirling generator. It should be noted that the heater 1, the cooler 2, etc. can select existing mature products, so their specific structures, etc. are not repeated here.

[0046] In summary, the embodiment of the utility model provides a free piston Stirling generator frequency regulating device, through the free piston Stirling generator 3 and the frequency modulation motor 4, the adjustable power supply 5 and the like, the operating frequency of the free piston Stirling generator 3 can be adjusted online steplessly. Specifically, in actual application, the heater 1 is turned on to heat the hot end of the generator, the cooler 2 is turned on to cool the cold end of the generator, and then the free piston Stirling generator 3 is started, and the electric energy generated after the generator is running is used by the load 6. If the operating frequency of the generator needs to be changed during use, the adjustable power supply 5 is turned on to input the target frequency, and then the frequency modulation motor 4 is excited by the adjustable power supply 5. Since the frequency modulation motor 4 is rigidly connected to the free piston Stirling generator 3, the vibration of the frequency modulation motor 4 will be transmitted to the free piston Stirling generator 3, and the operating frequency of the free piston Stirling generator 3 will be adjusted to be consistent with the frequency set by the adjustable power supply 5, thereby achieving the purpose of adjusting the operating frequency of the free piston Stirling generator 3. In the actual test process, it was found that when the operating frequency of the generator itself is slightly different from the target frequency, the adjustable power supply 5 only needs to consume very little electrical power to achieve the target. As the frequency difference between the two increases, the power consumption of the adjustable power supply 5 will also increase.

[0047] The Stirling generator experimental system provided by the present invention is described below. The Stirling generator experimental system described below and the free piston Stirling generator frequency regulating device described above can be referred to each other.

[0048] The utility model embodiment also provides a Stirling generator experimental system, including a free piston Stirling generator frequency regulating device as in the above-mentioned various embodiments. In this way, the free piston Stirling generator 3 will run at a certain frequency after being designed and assembled. If its operating frequency needs to be changed during actual use, the frequency modulation component can be turned on to make the frequency modulation component run according to the preset target frequency. Since the frequency modulation component in the device is rigidly connected to the free piston Stirling generator 3, the vibration of the frequency modulation component will be transmitted to the free piston Stirling generator 3, and the operating frequency of the adaptive free piston Stirling generator 3 will also be adjusted to the preset target frequency, thereby achieving the purpose of online stepless regulation of the operating frequency of the free piston Stirling generator 3, solving the problem that the existing free piston Stirling generator design frequency and the target frequency have deviations, the operating frequency changes with load changes, and the frequency cannot be adjusted online. The derivation process of this beneficial effect is roughly similar to the derivation process of the beneficial effect of the above-mentioned free piston Stirling generator frequency regulating device, so it will not be repeated here.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A frequency regulating device for a free piston Stirling generator, characterized in that: include: Free piston Stirling generator (3); A frequency modulation component is rigidly connected to the free piston Stirling generator (3), and the frequency modulation component is used to generate a preset target frequency so that the operating frequency of the free piston Stirling generator (3) reaches the preset target frequency.

2. The free piston Stirling generator frequency regulating device according to claim 1, characterized in that: The frequency modulation component comprises: A frequency-modulating motor (4) rigidly connected to the free-piston Stirling generator (3), the frequency-modulating motor (4) being used to form the preset target frequency; A frequency controller is electrically connected to the frequency-modulated motor (4), and the frequency controller is used to control the frequency of the frequency-modulated motor (4).

3. The free piston Stirling generator frequency regulating device according to claim 2, characterized in that: The frequency controller is an adjustable power supply (5), the adjustable power supply (5) is electrically connected to the frequency-modulated motor (4), and the adjustable power supply (5) is used to adjust the supply voltage of the frequency-modulated motor (4).

4. The free piston Stirling generator frequency regulating device according to claim 2, characterized in that: The frequency-modulated motor (4) comprises a first shell, and the free-piston Stirling generator (3) comprises a second shell, wherein the first shell is rigidly connected to the second shell.

5. The free piston Stirling generator frequency regulating device according to claim 4, characterized in that: The first shell and the second shell are connected by welding or by a bolt assembly.

6. The free piston Stirling generator frequency regulating device according to claim 1, characterized in that: Also includes: A load (6) is electrically connected to the free piston Stirling generator (3).

7. The free piston Stirling generator frequency regulating device according to claim 6, characterized in that: The load (6) is an adjustable resistor.

8. The free piston Stirling generator frequency regulating device according to claim 1, characterized in that: Also includes: A heater (1) is sleeved on the free piston Stirling generator (3), and the heater (1) is used to heat the hot end of the free piston Stirling generator (3).

9. The free piston Stirling generator frequency regulating device according to claim 1, characterized in that: Also includes: A cooler (2) is sleeved on the free piston Stirling generator (3), and the cooler (2) is used to cool the cold end of the free piston Stirling generator (3).

10. A Stirling generator experimental system, characterized in that: It comprises a free piston Stirling generator frequency regulating device as described in any one of claims 1 to 9.

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