Electric feedback active damping device and free piston Stirling generator and system
By introducing an electric feedback active vibration reduction device into the Stirling generator and using a vibration generator and a phase modulation device to adjust the current phase and amplitude, the vibration of the Stirling generator is offset, solving the control complexity and reliability problems in the existing technology and reducing costs.
Patent Information
- Application Number
- CN202410485529.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-22
- Publication Date
- 2025-10-24
AI Technical Summary
In the prior art, the vibration reduction mechanism control system of the free-piston Stirling generator is complex, difficult to control, has poor reliability and high cost.
An electric feedback active vibration reduction device is used, including a vibration generator and a phase adjustment device. It is rigidly connected to the Stirling generator and uses the generator's own current to drive the vibration generator. The current phase and amplitude are adjusted so that the vibration generator generates vibration in the opposite direction to the piston vibration to achieve vibration cancellation.
The structure of the vibration reduction device is simplified, the control difficulty and cost are reduced, the reliability is improved, the consistency of the vibration frequency is ensured, and the problems of vibration frequency following and lag are effectively solved.
Smart Images
Figure CN120830700A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of Stirling generators, in particular to an electric feedback active vibration reduction device, a free-piston Stirling generator and a system. BACKGROUND
[0002] The free-piston Stirling generator is a device for generating electricity by using the principle of Stirling cycle, and has two high-frequency reciprocating pistons inside, the movement of the pistons must bring the vibration of the generator shell, so in some specific application scenarios the generator must be actively damped.
[0003] Since the free-piston Stirling generator piston does 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, size and opposite direction as the shell itself is added to the shell through the active damper, the two vibrations can be completely cancelled out, so that the entire system is vibration-free.
[0004] In related technologies, the vibration acceleration of the free-piston Stirling generator shell is generally collected by a sensor, the collected data is transmitted to a control system, the control system is processed and calculated, and then a matched alternating current is output by the controller to drive the active damper to vibrate, so that the active damper outputs a vibration with the same frequency, size and opposite direction as the shell itself.
[0005] However, the above-mentioned related technology has the problems of complex control system, high control difficulty, poor reliability, high cost, etc. SUMMARY
[0006] The present application provides an electric feedback active vibration reduction device, a free-piston Stirling generator and a system, which effectively solve the defects of complex control system, high control difficulty, poor reliability and high cost in the prior art, and have the advantages of simple structure, easy control, low cost and high reliability.
[0007] According to the electric feedback active vibration reduction device provided by the present application, it can be applied to a free-piston Stirling generator, and the vibration reduction device comprises:
[0008] A vibration generator adapted to be rigidly connected to the free-piston Stirling generator, and an electric power input end of the vibration generator is electrically connected to an electric power output end of the free-piston Stirling generator;
[0009] A phase modulation device electrically connected to the vibration generator, used to adjust the phase of the current input to the vibration generator by the free-piston Stirling generator, so that the vibration generator generates a vibration opposite to the free-piston Stirling generator.
[0010] The electric feedback active vibration reduction mechanism provided by the application comprises a linear vibration motor.
[0011] The electric feedback active vibration reduction mechanism provided by the application comprises a linear vibration motor.
[0012] The electric feedback active vibration reduction mechanism provided by the application further comprises an adjusting device for adjusting the amplitude of the vibration generator.
[0013] The application further provides a free piston Stirling generator comprising a Stirling generator body and the electric feedback active vibration reduction mechanism.
[0014] The vibration generator of the electric feedback active vibration reduction mechanism is rigidly connected with the Stirling generator body.
[0015] The power input end of the vibration generator is electrically connected with the power output end of the Stirling generator body.
[0016] The electric feedback active vibration reduction mechanism provided by the application comprises a linear vibration motor.
[0017] The vibration generator of the electric feedback active vibration reduction mechanism is rigidly connected with the Stirling generator body.
[0018] The vibration generator of the electric feedback active vibration reduction mechanism is rigidly connected with the Stirling generator body.
[0019] The vibration generator of the electric feedback active vibration reduction mechanism is rigidly connected with the Stirling generator body.
[0020] The vibration generator of the electric feedback active vibration reduction mechanism is rigidly connected with the Stirling generator body.
[0021] The vibration generator of the electric feedback active vibration reduction mechanism is rigidly connected with the Stirling generator body.
[0022] The application further provides a free piston Stirling generator system comprising the electric feedback active vibration reduction mechanism or the free piston Stirling generator.
[0023] The free-piston Stirling generator system provided by the application further comprises a load, which is connected in parallel with the electric feedback active damping mechanism.
[0024] The electric feedback active damping device, the free-piston Stirling generator and the system provided by the application can guarantee that the vibration frequency of the vibration generator is always the same as the vibration frequency of the piston, and can simply and conveniently adjust the phase of the current input to the vibration generator by the free-piston Stirling generator, so that the vibration generator can generate vibration in the opposite direction of the piston; the amplitude of the vibration generator is easy to adjust, so that the vibration generator can output vibration with the same frequency, equal size and opposite direction as the vibration of the piston, so that the vibrations of the two are offset; 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 since the vibration frequency of the vibration generator 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 can always play a role in damping, and the reliability is guaranteed. BRIEF DESCRIPTION OF DRAWINGS
[0025] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.
[0026] Figure 1 FIG. 1 is a structural schematic diagram of a free-piston Stirling generator system provided by an embodiment of the application.
[0027] Reference signs:
[0028] 10, vibration generator; 11, phase adjusting device; 20, Stirling generator body; 21, heating device; 22, cooling device; 30, load. DETAILED DESCRIPTION
[0029] In order to make the objects, technical solutions and advantages of the application clearer, the technical solutions in the application will be clearly and completely described below in combination with the drawings in the application. Obviously, the described embodiments are some of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.
[0030] In order to facilitate the understanding of the electric feedback active vibration reduction device, the free piston Stirling generator and the system provided by the present application, the application background thereof is first described. The free piston Stirling generator has two high-frequency reciprocating pistons inside. The movement of the pistons must cause the vibration of the shell of the generator. In some specific application scenarios, the generator needs to be actively damped. The vibration of the active damper can be conveniently adjusted. The difficulty of active damping lies in realizing the vibration with the same frequency and completely opposite phase,
[0031] In the related art, the vibration acceleration of the shell of the free piston Stirling generator is generally collected by a sensor, and the collected data is transmitted to a control system. The control system is subjected to data processing and calculation, and then a matched alternating current is output by a controller to drive the vibration of the active damper, so as to make the active damper output a vibration with the same frequency, equal size and opposite direction as the vibration of the shell itself.
[0032] However, it is found in actual work that the related art has at least the following problems or difficulties:
[0033] 1. The accuracy of the sensor must be very high and must be able to accurately collect the vibration of the generator itself. If it is not accurate, the current output by the controller will not match, and the system vibration cannot be completely cancelled out.
[0034] 2. The delay of the control system must be very high. Under normal circumstances, the operating frequency of the generator is greater than 50 Hz, and the two vibrations must be completely opposite. Therefore, the sensor and the control cannot have a delay, otherwise the vibration of the active damper will always lag behind the vibration of the generator shell.
[0035] 3. The entire system is relatively complex. The power consumption of the control system comes from the outside, which is generally direct current or alternating current. If it is alternating current control, the alternating current needs to be frequency-converted to match the frequency of the generator. If it is direct current, the direct current needs to be converted into alternating current before frequency conversion. It is itself relatively complex to ensure that the frequency of the active damper 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 damper in the related art has the problems of complex control system, large control difficulty, poor reliability, high cost and the like.
[0037] Based on the above problems and findings, the present application provides an electric feedback active vibration reduction device, a free piston Stirling generator and a system, which have the advantages of simple structure, easy implementation, stability, reliability, low cost and the like.
[0038] The following will be described in combination with Figure 1The application discloses an electric feedback active vibration reduction device, a free piston Stirling generator and a system.
[0039] Refer to Figure 1 The application discloses an electric feedback active vibration reduction device, a free piston Stirling generator and a system.
[0040] In actual application, the free piston Stirling generator generates current through reciprocating motion of a piston, so that the frequency of output current is the same as the frequency of the piston vibration; the vibration generator 10 is driven by the current generated by the free piston Stirling generator, so that the vibration frequency of the vibration generator 10 is always the same as the vibration frequency of the piston.
[0041] The phase of the current input to the vibration generator 10 by the free piston Stirling generator can be adjusted through the phase adjustment device 11, so that the vibration generator 10 can generate vibration opposite to the direction of the piston; at this time, the vibration generated by the vibration generator 10 is the same in frequency and opposite in direction to the vibration of the piston; and the amplitude of the vibration generator 10 is easy to adjust, so that the vibration generator 10 can output vibration which is the same in frequency, equal in size and opposite in direction to the vibration of the piston, and the vibration of the two can be offset.
[0042] Compared with the prior art, the structure of the vibration reduction device is simplified, the complex control system is omitted, the control difficulty is reduced, the cost is reduced, and since the vibration frequency of the vibration generator 10 is always the same as the vibration frequency of the piston of the generator, 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 role in vibration reduction, and the reliability is guaranteed.
[0043] The free piston Stirling generator works when the piston moves linearly, so that the vibration generator 10 adopts a linear vibration motor in order to adapt to the vibration direction; according to different working principles, the linear vibration motor has a plurality of selectable types, for example, an electromagnetic linear vibration motor and an inertial linear vibration motor, and the specific type can be selected according to actual needs, and the embodiment of the application does not make specific limitation.
[0044] It should be noted that the above various types or principles of linear vibration motor can be obtained from the market, and the specific structure can refer to the prior art. In the embodiment of the present application, only the function of generating linear vibration is applied, and no improvement is made to the structure or principle. Therefore, the specific structure of the linear vibration motor is not described in detail in the embodiment of the present application.
[0045] In practical applications, the linear vibration motor is rigidly connected with the free piston Stirling generator, preferably the vibration of the linear vibration motor and the vibration of the piston are in a straight line or parallel straight lines, further preferably the vibration of the two is in a straight line. The vibration direction of the linear motor is adjusted by the phase adjusting device 11, so that the linear vibration motor generates vibration opposite to the direction of the piston, and the vibration of the two is offset.
[0046] Specifically, the phase adjusting device 11 is connected in series with the vibration generator 10, and is used to adjust the phase of the current driving the vibration generator 10, so as to adjust the vibration direction of the vibration generator 10.
[0047] According to different working principles, the phase adjusting device 11 has multiple selectable types, such as a thyristor current controller (SCR), a capacitive phase regulator, etc. The specific selection can be made according to actual needs, as long as the current phase can be adjusted. The specific structure of the phase adjusting device 11 is not limited in the embodiment of the present application.
[0048] It should also be noted that the specific structure of the above phase adjusting device 11 can refer to the prior art. In the embodiment of the present application, only the current phase adjusting function is applied, and no improvement is made to the structure or principle. Therefore, the specific structure of the phase adjusting device 11 is not described in detail in the embodiment of the present application.
[0049] In an embodiment of the present application, the electric feedback active vibration reduction mechanism further comprises an adjusting device for adjusting the amplitude of the vibration generator 10. Through the adjusting device, the amplitude of the vibration generator 10 can be adjusted, 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 vibration of the two is completely offset.
[0050] The amplitude of the vibration generator 10 can be adjusted in multiple ways, which depends on the type and design of the vibration generator 10. Generally, adjusting the amplitude of the 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 present application, the adjusting device can adopt a voltage regulator or a current regulator.
[0051] In actual applications, the linear vibration motor is driven to vibrate by the current output by the free piston Stirling generator itself, so the vibration frequency of the linear vibration motor can be guaranteed 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, and the amplitude of the linear vibration motor is adjusted to be the same as the amplitude of the generator through the adjustment device, thereby generating a vibration with the same frequency, equal magnitude and opposite direction as the vibration of the generator, so that the vibrations of the two are completely offset.
[0052] It should be noted that the above-mentioned electric feedback active vibration reduction device can be applied to free piston Stirling generators, but not only to free piston Stirling generators. The embodiments of the present invention do not exclude the application of the electric feedback active vibration reduction device 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 device described above can be referred to in correspondence with 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, 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.
[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 achieve 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 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 arranged in 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 the purpose is to facilitate understanding of the basic structure and working principle of the Stirling generator, that is, the structure described above is only a part of the structure of the Stirling generator body 20, not all, in order to realize the function of generating electricity, it can also include other structures or components, which can be referred to in the prior art. In the present application, only the electric feedback active vibration reduction mechanism is installed on 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 present application will not be described again.
[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 at the bottom or side of the Stirling generator body 20, or can be connected at other positions, can be connected on the shell of the Stirling generator body 20, or can be connected on 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, for example, welding can be used, through welding, the connection between the vibration generator 10 and the Stirling generator body 20 can be more firm, and no additional connecting components are required, but in actual application, based on the complex and variable working scene, the vibration generator 10 may need to be disassembled and reassembled for 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 through bolts and other connecting members, so as to facilitate the disassembly of the vibration generator 10 and meet the needs of later maintenance of the equipment.
[0062] In the present embodiment, the vibration generator 10 is located at the bottom of the Stirling generator body 20, preferably making the vibration of the linear vibration motor and the vibration of the piston in a straight line or parallel straight line, so as to facilitate the mutual reduction of the vibrations of the two; and the vibration generator 10 and the shell of the Stirling body are fixedly connected through bolts.
[0063] The free-piston Stirling generator system provided by the present application will be described below, and the free-piston Stirling generator system described below can be correspondingly referred to the electric feedback active vibration reduction device and the free-piston Stirling generator described above.
[0064] Reference Figure 1A free piston Stirling generator system comprises the free piston Stirling generator and a load 30 connected in parallel with the electric feedback active damping mechanism.
[0065] In actual work, the current generated by the free piston Stirling generator after starting is divided into two paths, one of which is input to the electric feedback active damping mechanism for driving 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 part of the current output by the free piston Stirling generator is used to drive the electric feedback active damping mechanism, and most of it is consumed by the load 30.
[0067] The new point of the present application 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 is always the same as that of the piston; through the phase adjusting 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 vibration in the opposite direction of the piston; and the amplitude of the vibration generator 10 is easy to adjust, so that the vibration generator 10 can output a vibration with the same frequency, equal size and opposite direction as the vibration of the piston itself, so that the vibrations of the two are offset; 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 since the vibration frequency of the vibration generator 10 is always the same as that of the generator piston, the problems of vibration frequency following and vibration lag are effectively solved, regardless of the change of the output characteristics of the generator, the vibration generator 10 can always play a role in damping, 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 present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. An electric feedback active vibration reduction mechanism characterized by comprising: The damping mechanism can be applied to a free piston Stirling generator, and the damping mechanism comprises: a vibration generator (10) rigidly connected to the free piston Stirling generator, an electric input end of the vibration generator (10) being electrically connected to an electric output end of the free piston Stirling generator; a phase adjusting device (11) electrically connected to the vibration generator (10) and used for adjusting a phase of an electric current input to the vibration generator (10) by the free piston Stirling generator, so that the vibration generator (10) generates vibration in a direction opposite to that of the free piston Stirling generator.
2. The electric feedback active damping mechanism of claim 1, wherein, The vibration generator (10) comprises a linear vibration motor.
3. The electric feedback active damping mechanism of claim 1, wherein, The phase adjusting device (11) is connected in series to the vibration generator (10).
4. A free piston Stirling engine characterised in that, The damping mechanism comprises a Stirling generator body (20) and the electric feedback active damping mechanism according to any one of claims 1-3. The vibration generator (10) of the electric feedback active damping mechanism is rigidly connected to the Stirling generator body (20). An electric input end of the vibration generator (10) is electrically connected to an electric output end of the Stirling generator body (20).
5. A free piston Stirling generator according to claim 4, characterised in that, The phase adjusting device (11) is connected in series between the Stirling generator body (20) and the vibration generator (10).
6. A free piston Stirling generator according to claim 4, characterised in that The vibration generator (10) is fixedly connected to an outer shell of the Stirling generator body (20).
7. A free piston Stirling generator according to claim 6, characterised in that The vibration generator (10) is welded to or detachably connected to the outer shell of the Stirling generator by a connecting member.
8. The free piston Stirling generator of claim 4 wherein, The Stirling generator body (20) is provided with a heating device (21) for heating a hot end of the Stirling generator body (20).
9. The free piston Stirling generator of claim 4 wherein, The Stirling generator body (20) is provided with a cooling device (22) for cooling a cold end of the Stirling generator body (20).
10. A free piston Stirling engine system characterized by, The damping mechanism comprises the electric feedback active damping mechanism according to any one of claims 1-3 or the free piston Stirling generator according to any one of claims 4-9.