Electric feedback active vibration reduction mechanism and free piston Stirling generator and system
By using an electrical feedback active vibration damping mechanism in a free piston Stirling generator, and using a vibration generator and a phase regulating device to adjust the vibration phase and amplitude, the problem of poor complexity and reliability of the vibration damping mechanism in the prior art is solved, and the problem of poor vibration damping mechanism is realized. Stable vibration offset and cost reduction.
Patent Information
- Application Number
- CN202420842835.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-22
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-04-22
AI Technical Summary
In the prior art, the vibration damping mechanism control system of the free piston Stirling generator is complex, has difficulty in controlling, has poor reliability and high cost, making it difficult to achieve effective vibration offset.
The electric feedback active vibration damping mechanism is used to rigidly connect it to the Stirling generator through a vibration generator, and the current phase is adjusted by a phase adjustment device, so that the vibration generator produces vibration opposite to the direction of the piston, and the vibration amplitude is adjusted through the amplitude adjustment device. Make sure that the vibration frequency of the vibration generator is the same as the vibration frequency of the piston, the same magnitude and the opposite direction.
The structure of the vibration damping mechanism is simplified, the control difficulty and cost are reduced, the reliability is improved, the vibration frequency is always consistent, the vibration hysteresis and frequency follow-up problems are avoided, and effective vibration cancellation is achieved.
Smart Images
Figure CN222163384U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of Stirling generators, in particular to an electric feedback active vibration reduction mechanism and a free piston Stirling generator and a system. Background Art
[0002] A free-piston Stirling generator is a device that uses the Stirling cycle principle to generate electricity. It has two high-frequency reciprocating pistons inside. The movement of the pistons will inevitably cause the generator casing to vibrate. Therefore, in certain specific application scenarios, the generator must be actively vibration-reduced.
[0003] Since the piston of the free-piston Stirling generator performs high-frequency sinusoidal reciprocating motion, the vibration of the shell is also sinusoidal. In theory, as long as an external vibration with the same frequency, equal magnitude and opposite direction as the shell's own vibration is added to the shell through an active shock absorber, the two vibrations can be completely offset, thereby achieving vibration-free system.
[0004] In the related art, the vibration acceleration of the free piston Stirling generator shell is generally collected by sensors, and the collected data is transmitted to the control system. After the control system processes and calculates the data, the controller outputs a matching AC power to drive the active shock absorber to vibrate, so that the active shock absorber outputs a vibration with the same frequency, equal magnitude and opposite direction as the vibration of the shell itself.
[0005] However, the above-mentioned related technologies have problems such as complex control systems, great control difficulty, poor reliability and high cost. Utility Model Content
[0006] The utility model provides an electric feedback active vibration reduction mechanism and a free piston Stirling generator and system, which are used to effectively solve the defects of the vibration reduction mechanism control system in the prior art that is relatively complex, difficult to control, poor reliability and high cost. It has the advantages of simple structure, easy control, low cost and high reliability.
[0007] According to the utility model, an electric feedback active vibration reduction mechanism is provided, which can be applied to a free piston Stirling generator. The vibration reduction mechanism includes:
[0008] a vibration generator adapted to be rigidly connected to the free piston Stirling generator, wherein the power input end of the vibration generator is electrically connected to the power output end of the free piston Stirling generator;
[0009] The phase adjustment device is electrically connected to the vibration generator and is used to adjust the phase of the current input from the free piston Stirling generator to the vibration generator, so that the vibration generator generates vibration in the opposite direction to the free piston Stirling generator.
[0010] According to an electric feedback active vibration reduction mechanism provided by the utility model, the vibration generator includes a linear vibration motor.
[0011] According to the electric feedback active vibration reduction mechanism provided by the utility model, the phase adjustment device is connected in series with the vibration generator.
[0012] According to the electric feedback active vibration reduction mechanism provided by the utility model, it also includes an adjustment device for adjusting the amplitude of the vibration generator.
[0013] The utility model also provides a free piston Stirling generator, comprising a Stirling generator body and any one of the above-mentioned electric feedback active vibration reduction mechanisms;
[0014] The vibration generator of the electric feedback active vibration reduction mechanism is rigidly connected to the Stirling generator body;
[0015] The power input end of the vibration generator is electrically connected to the power output end of the Stirling generator body.
[0016] According to a free piston Stirling generator provided by the utility model, the phase adjustment device is connected in series between the Stirling generator body and the vibration generator.
[0017] According to a free piston Stirling generator provided by the utility model, the vibration generator is fixedly connected to the outer shell of the Stirling generator body.
[0018] According to a free piston Stirling generator provided by the utility model, the vibration of the vibration generator and the vibration of the Stirling engine body are in a straight line or a parallel straight line.
[0019] According to a free piston Stirling generator provided by the utility model, the vibration generator is welded to the shell of the Stirling generator or is detachably connected to the shell via a connecting piece.
[0020] According to a free piston Stirling generator provided by the utility model, a heating device is arranged on the Stirling generator body, and the heating device is used to heat the hot end of the Stirling generator body.
[0021] According to a free piston Stirling generator provided by the utility model, a cooling device is arranged on the Stirling generator body, and the cooling device is used to cool the cold end of the Stirling generator body.
[0022] The utility model also provides a free piston Stirling generator system, comprising any one of the above-mentioned electric feedback active vibration reduction mechanisms or any one of the above-mentioned free piston Stirling generators.
[0023] A free piston Stirling generator system provided by the utility model further includes a load, and the load is connected in parallel with the electric feedback active vibration reduction mechanism.
[0024] The utility model provides an electric feedback active vibration reduction mechanism and a free piston Stirling generator and system. The free piston Stirling generator generates current by doing work through the reciprocating motion of the piston, so the frequency of its output current must be the same as the frequency of the piston vibration, and the vibration generator is driven by the current generated by the free piston Stirling generator itself, so that the vibration frequency of the vibration generator can be guaranteed to be always the same as the vibration frequency of the piston; through the phase adjustment device, the phase of the current input from the free piston Stirling generator to the vibration generator can be simply and conveniently adjusted, so that the vibration generator can generate a vibration in the opposite direction to the piston; and the amplitude of the vibration generator is very easy to adjust, so that the vibration generator can output a vibration with the same frequency, equal magnitude and opposite direction as the vibration frequency of the piston itself, so that the vibrations of the two cancel each other out; compared with the related art, the structure is simplified, the complex control system is omitted, the control difficulty is reduced, the cost is reduced, and because the vibration frequency of the vibration generator is always the same as the frequency of the generator piston vibration, the problems of vibration frequency following and vibration lag are effectively solved, no matter how the output characteristics of the generator change, the vibration generator can always play a vibration reduction role, and the reliability is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.
[0026] Figure 1 It is a structural schematic diagram of a free piston Stirling generator system provided in an embodiment of the utility model.
[0027] Reference numerals:
[0028] 10. Vibration generator; 11. Phase adjustment device; 20. Stirling generator body; 21. Heating device; 22. Cooling device; 30. Load. DETAILED DESCRIPTION
[0029] 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.
[0030] In order to facilitate the understanding of the electric feedback active vibration reduction mechanism and the free piston Stirling generator and system provided by the utility model, its application background is first explained. There are two high-frequency reciprocating pistons inside the free piston Stirling generator. The movement of the pistons will inevitably cause the shell of the generator to vibrate. In certain specific application scenarios, the generator needs to be actively vibration-reduced. The vibration size of the active vibration reducer can be adjusted relatively conveniently. The difficulty of active vibration reduction lies in achieving two vibrations with exactly the same vibration frequency and completely opposite phases.
[0031] In the related art, the vibration acceleration of the free piston Stirling generator shell is generally collected by sensors, and the collected data is transmitted to the control system. After the control system processes and calculates the data, the controller outputs a matching AC power to drive the active shock absorber to vibrate, so that the active shock absorber outputs a vibration with the same frequency, equal magnitude and opposite direction as the vibration of the shell itself.
[0032] However, in actual work, it is found that the use of the above-mentioned related technologies has at least the following problems or difficulties:
[0033] 1. The accuracy requirement for the sensor is very high. It must be able to accurately collect the vibration size of the generator itself. If it is inaccurate, the current size output by the controller will not match, and the system vibration cannot be completely offset;
[0034] 2. The control system has very high requirements for delay. Usually, the operating frequency of the generator is greater than 50Hz, and the two vibrations are required to be completely opposite. Therefore, there should be no delay in the sensor and control, otherwise the vibration of the active shock absorber will always lag behind the vibration of the generator housing;
[0035] 3. The whole system is relatively complex. The power consumption of the control system comes from the outside, usually DC or AC. If it is AC control, the AC needs to be frequency-converted to match the frequency of the generator. If it is DC, the DC needs to be converted to AC before frequency conversion. It is relatively complex to ensure that the frequency of the active shock absorber is completely consistent with the frequency of the free piston Stirling generator, and the frequency of the free piston Stirling generator changes with other factors such as load.
[0036] Therefore, the active shock absorber in the related art has problems such as complex control system, great control difficulty, poor reliability and high cost.
[0037] Based on the above problems and findings, the utility model provides an electric feedback active vibration reduction mechanism and a free piston Stirling generator and system, which have the advantages of simple structure, easy implementation, stability and reliability, and low cost.
[0038] Combine the following Figure 1 The utility model describes an electric feedback active vibration reduction mechanism and a free piston Stirling generator and system.
[0039] Reference Figure 1 , an electric feedback active vibration reduction mechanism, which can be applied to a free piston Stirling generator, comprises a vibration generator 10 and a phase adjustment device 11; wherein, the vibration generator 10 is adapted to be rigidly connected to the free piston Stirling generator, the power input end of the vibration generator 10 is electrically connected to the power output end of the free piston Stirling generator, and is used to generate vibrations with the same frequency as the free piston Stirling generator under the drive of the output power of the free piston Stirling generator; the phase adjustment device 11 is electrically connected to the vibration generator 10, and is used to adjust the phase of the current input from the free piston Stirling generator to the vibration generator 10, so that the vibration generator 10 generates vibrations in a direction completely opposite to that of the free piston Stirling generator.
[0040] In actual applications, the free piston Stirling generator generates current by performing work through the reciprocating motion of the piston, so the frequency of its output current must be the same as the frequency of the piston vibration, and the vibration generator 10 is driven by the current generated by the free piston Stirling generator itself, so that the vibration frequency of the vibration generator 10 can be ensured to be always the same as the vibration frequency of the piston.
[0041] Through the phase adjustment device 11, the phase of the current input from the free piston Stirling generator to the vibration generator 10 can be simply and conveniently adjusted, so that the vibration generator 10 can generate a vibration in the opposite direction to the piston. At this time, the vibration generated by the vibration generator 10 has the same frequency as the vibration of the piston and the opposite direction; and the amplitude of the vibration generator 10 is very easy to adjust, so the vibration generator 10 can output a vibration with the same frequency, equal magnitude and opposite direction as the vibration of the piston itself, so that the vibrations of the two cancel each other out.
[0042] Compared with the related art, the structure of the vibration reduction mechanism has been simplified, eliminating the complex control system, reducing the control difficulty and cost. Moreover, since the vibration frequency of the vibration generator 10 is always the same as the vibration frequency of the generator piston, the problems of vibration frequency following and vibration lag are effectively solved. No matter how the output characteristics of the generator change, the vibration generator 10 can always play a vibration reduction role and the reliability is guaranteed.
[0043] When the free piston Stirling generator is working, its piston performs linear reciprocating motion. Therefore, in order to adapt to its vibration direction, the vibration generator 10 adopts a linear vibration motor. According to different working principles, there are many types of linear vibration motors to choose from, such as electromagnetic linear vibration motors and inertial linear vibration motors. The specific type can be selected according to actual needs, and no specific restrictions are made in the embodiments of the utility model.
[0044] It should be pointed out that the above-mentioned various types or principles of linear vibration motors can be obtained commercially, and their specific structures can refer to the prior art. The embodiments of the utility model only apply their function of generating linear vibration, and do not make any improvements to their structure or principles. Therefore, the specific structure of the linear vibration motor is not described in detail in the embodiments of the utility model.
[0045] In practical applications, the linear vibration motor is rigidly connected to the free piston Stirling generator, and preferably the vibration of the linear vibration motor and the vibration of the piston are in a straight line or parallel lines. It is further preferred that the vibrations of the two are in a straight line. The vibration direction of the linear vibration motor is adjusted by the phase adjustment device 11, so that the linear vibration motor generates vibration in the opposite direction of the piston, so that the vibrations of the two cancel each other out.
[0046] Specifically, the phase adjustment device 11 is connected in series with the vibration generator 10 to adjust the phase of the current driving the vibration generator 10 , thereby adjusting the vibration direction of the vibration generator 10 .
[0047] According to different working principles, the phase adjustment device 11 has a variety of selectable types, such as a thyristor current controller (SCR), a capacitive phase adjuster, etc., which can be selected according to actual needs. As long as the current phase can be adjusted, no specific restrictions are made in the embodiments of the utility model.
[0048] It should also be pointed out that the specific structure of the above-mentioned phase adjustment device 11 can refer to the prior art. The embodiment of the utility model only applies its current phase adjustment function, and does not make any improvements to its structure or principle. Therefore, the specific structure of the phase adjustment device 11 is not described in detail in the embodiment of the utility model.
[0049] In one embodiment of the utility model, the electric feedback active vibration reduction mechanism also includes an adjusting device for adjusting the amplitude of the vibration generator 10; the amplitude of the vibration generator 10 can be adjusted by the adjusting device so that the vibration generated by the vibration generator 10 has the same amplitude as the vibration of the free piston Stirling generator, so that the vibrations of the two are completely offset.
[0050] The amplitude of the vibration generator 10 can be adjusted in a variety of ways, depending on the type and design of the vibration generator 10. Generally, adjusting the amplitude of a vibration generator 10 such as a linear vibration motor by adjusting the voltage or current is a relatively simple and direct method. Therefore, in the embodiment of the utility model, the adjustment device can be a voltage regulator or a current regulator.
[0051] In practical applications, the linear vibration motor is driven to vibrate by the current output by the free piston Stirling generator itself, so that the vibration frequency of the linear vibration motor can be ensured to be always consistent with the vibration frequency of the free piston Stirling generator, effectively avoiding problems such as vibration frequency following and vibration lag. The phase of the current is then adjusted by the phase adjustment device 11 to make the vibration of the linear vibration motor opposite to the vibration of the generator. The amplitude of the linear vibration motor is adjusted by the adjustment device to be the same as the amplitude of the generator, thereby generating a vibration with the same frequency, equal magnitude and opposite direction as the vibration frequency of the generator, so that the vibrations of the two are completely offset.
[0052] It should be pointed out that the above-mentioned electric feedback active vibration reduction mechanism can be applied to free piston Stirling generators, but not only to free piston Stirling generators. The embodiments of the utility model do not exclude the application of the electric feedback active vibration reduction mechanism in other piston generators.
[0053] The free piston Stirling generator provided by the present invention is described below. The free piston Stirling generator described below and the electric feedback active vibration reduction mechanism described above can be referred to each other.
[0054] Reference Figure 1 A free piston Stirling generator comprises a Stirling generator body 20 and the above-mentioned electric feedback active vibration reduction mechanism; wherein, a vibration generator 10 of the electric feedback active vibration reduction mechanism is rigidly connected to the Stirling generator body 20; and an electric power input end of the vibration generator 10 is electrically connected to an electric power output end of the Stirling generator.
[0055] The power output by the Stirling generator body 20 drives the vibration generator 10 to vibrate, which can ensure that the vibration frequencies of the two are the same. Then the current phase is adjusted by the phase adjustment device 11 to make the vibration directions of the two opposite, thereby making the vibrations of the two cancel each other out and achieving vibration reduction.
[0056] Specifically, a heating device 21 and a cooling device 22 are provided on the Stirling generator body 20; wherein, the heating device 21 is used to heat the hot end of the Stirling generator body 20 so that the hot end maintains a higher temperature, and at the hot end, the working fluid expands due to the heat; the cooling device 22 is used to cool the cold end of the Stirling generator body 20 so that the cold end maintains a relatively low temperature, and at the cold end, the working fluid is cooled and compressed; through the heating device 21 and the cooling device 22, a sufficient temperature difference is formed between the cold end and the hot end of the Stirling generator body 20, completing the Stirling cycle to drive the piston movement to continuously generate electrical energy.
[0057] In some embodiments, the heat source of the heating device 21 can come from fuel combustion, solar energy, etc., and the cold source of the cooling device 22 can come from air cooling, water cooling, etc., and the specific configuration needs to be made according to the actual application scenario.
[0058] Specifically, the heating device 21 and the cooling device 22 can be configured as a cylindrical or annular structure, and both are sleeved on the Stirling generator body 20 .
[0059] It should be noted that the above is only a brief description of the structure or principle of the Stirling generator body 20, and its purpose is to facilitate understanding of the basic structure and working principle of the Stirling generator. That is to say, the structure described above is only a part of the structure of the Stirling generator body 20 but not all of it. In order to realize the power generation function, it can also include other structures or components. For details, please refer to the prior art. In the implementation of the utility model, only an electric feedback active vibration reduction mechanism is added to the Stirling generator body 20 to reduce vibration, and no changes are made to the internal structure of the Stirling generator body 20. Therefore, the specific structure of the Stirling generator in the embodiment of the utility model is not repeated.
[0060] The connection position of the vibration generator 10 on the Stirling generator body 20 is optional. For example, the vibration generator 10 can be connected to the bottom or side of the Stirling generator body 20, or to other positions. It can be connected to the outer casing of the Stirling generator body 20, or to other components of the Stirling generator body 20.
[0061] In addition, the vibration generator 10 and the Stirling generator body 20 have a variety of optional connection methods, such as welding. Through welding, the connection between the vibration generator 10 and the Stirling generator body 20 can be made more secure, and no additional connecting parts are required. However, in actual applications, based on complex and changeable working scenarios, the vibration generator 10 may need to be disassembled and then readjusted and assembled to facilitate maintenance and component replacement, and welding is a non-detachable connection. Therefore, the vibration generator 10 and the Stirling generator body 20 can also be detachably connected by connecting components such as bolts to facilitate the disassembly and assembly of the vibration generator 10 and meet the needs of later maintenance of the equipment.
[0062] In this embodiment, the vibration generator 10 is located at the bottom of the Stirling generator body 20, and preferably the vibration of the linear vibration motor and the vibration of the piston are in a straight line or parallel lines so that the vibrations of the two can subtract from each other; and the vibration generator 10 is fixedly connected to the outer shell of the Stirling body by bolts.
[0063] The free piston Stirling generator system provided by the present invention is described below. The free piston Stirling generator system described below and the electric feedback active vibration reduction mechanism and the free piston Stirling generator described above can correspond to each other.
[0064] Reference Figure 1 A free piston Stirling generator system comprises the above-mentioned free piston Stirling generator and a load 30, wherein the load 30 is connected in parallel with an electric feedback active vibration reduction mechanism.
[0065] In actual operation, after the free piston Stirling generator is started, the current it generates is divided into two paths, one of which is input into the electrical feedback active vibration reduction mechanism to drive the vibration generator 10 to vibrate to reduce the vibration of the Stirling generator body 20, and the other is consumed by the load 30.
[0066] It can be understood that only a small portion of the current output by the free-piston Stirling generator is used to drive the electric feedback active vibration reduction mechanism, and most of it is consumed by the load 30 .
[0067] The novelty of the utility model is that the vibration generator 10 is driven by the current generated by the free piston Stirling generator itself, so that the vibration frequency of the vibration generator 10 can be ensured to be always the same as the vibration frequency of the piston; through the phase adjustment device 11, the phase of the current input to the vibration generator 10 by the free piston Stirling generator can be simply and conveniently adjusted, so that the vibration generator 10 can generate a vibration in the opposite direction to the piston; and the amplitude of the vibration generator 10 is very easy to adjust, so that the vibration generator 10 can output a vibration with the same frequency, equal magnitude and opposite direction as the vibration frequency of the piston itself, so that the vibrations of the two cancel each other out; compared with the related art, the structure is simplified, the complex control system is omitted, the control difficulty is reduced, and the cost is reduced. Moreover, since the vibration frequency of the vibration generator 10 is always the same as the frequency of the generator piston vibration, the problems of vibration frequency following and vibration lag are effectively solved. No matter how the output characteristics of the generator change, the vibration generator 10 can always play a vibration reduction role, and the reliability is guaranteed.
[0068] 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. An electric feedback active vibration reduction mechanism, characterized in that: Applicable to a free piston Stirling generator, the electric feedback active vibration reduction mechanism comprises: A vibration generator (10) is adapted to be rigidly connected to the free piston Stirling generator, wherein the power input end of the vibration generator (10) is electrically connected to the power output end of the free piston Stirling generator; A phase adjustment device (11) is electrically connected to the vibration generator (10) and is used to adjust the phase of the current input from the free piston Stirling generator to the vibration generator (10), so that the vibration generator (10) generates vibration in the opposite direction to the free piston Stirling generator.
2. The electric feedback active vibration reduction mechanism according to claim 1, characterized in that: The vibration generator (10) comprises a linear vibration motor.
3. The electric feedback active vibration reduction mechanism according to claim 1, characterized in that: The phase adjustment device (11) is connected in series with the vibration generator (10).
4. A free piston Stirling generator, characterized in that: It comprises a Stirling generator body (20) and an electric feedback active vibration reduction mechanism as claimed in any one of claims 1 to 3; The vibration generator (10) of the electric feedback active vibration reduction mechanism is rigidly connected to the Stirling generator body (20); The power input end of the vibration generator (10) is electrically connected to the power output end of the Stirling generator body (20).
5. The free piston Stirling generator according to claim 4, characterized in that: The phase adjustment device (11) is connected in series between the Stirling generator body (20) and the vibration generator (10).
6. The free piston Stirling generator according to claim 4, characterized in that: The vibration generator (10) is fixedly connected to the outer shell of the Stirling generator body (20).
7. The free piston Stirling generator according to claim 6, characterized in that: The vibration generator (10) is welded to the shell of the Stirling generator or is detachably connected to the shell via a connecting piece.
8. The free piston Stirling generator according to claim 4, characterized in that: The Stirling generator body (20) is provided with a heating device (21), and the heating device (21) is used to heat the hot end of the Stirling generator body (20).
9. The free piston Stirling generator according to claim 4, characterized in that: The Stirling generator body (20) is provided with a cooling device (22), and the cooling device (22) is used to cool the cold end of the Stirling generator body (20).
10. A free piston Stirling generator system, characterized in that: It comprises an electric feedback active vibration reduction mechanism as described in any one of claims 1-3 or a free piston Stirling generator as described in any one of claims 4-9.