Magnetic centering mechanism, gas spring phase adjuster and thermoacoustic generator

Abstract

The application provides a magnetic force centering mechanism, a gas spring phase adjuster and a thermoacoustic generator, wherein the magnetic force centering mechanism is suitable for the gas spring phase adjuster and comprises an outer magnet assembly and an inner magnet assembly, the outer magnet assembly is arranged on a hot end piston and / or a cold end piston of the gas spring phase adjuster, and the outer magnet assembly comprises a first outer magnet; the inner magnet assembly is arranged on an outer circumferential surface of a piston shaft cylinder of the gas spring phase adjuster, and the inner magnet assembly comprises a first end magnet, a second end magnet and an intermediate magnet arranged between the first end magnet and the second end magnet, the intermediate magnet corresponds to the outer magnet, the magnetic field direction of the intermediate magnet is the same as that of the first outer magnet, and the magnetic field directions of the first end magnet and the second end magnet are opposite to that of the first outer magnet. The magnetic force centering mechanism can automatically keep the moving part in the balanced position, and the performance of the gas spring phase adjuster is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermoacoustic equipment, and in particular to a magnetic centering mechanism, a gas spring phase adjuster and a thermoacoustic generator. BACKGROUND

[0002] Thermoacoustic technology is a technology for converting energy between heat and sound waves (sound waves are a kind of mechanical energy). In order to obtain an ideal conversion efficiency, a key component (mainly a regenerator) in a thermoacoustic device must obtain a specific phase relationship of the sound field, and therefore a phase adjuster is an essential component in the thermoacoustic device. For a small-power thermoacoustic device, the phase adjuster mainly adopts a resonant structure composed of a spring piston to adjust the phase. With the increase of the power of the thermoacoustic device, the moving mass of the phase adjuster will increase accordingly. In order to obtain a large stiffness, the thickness of the leaf spring must be increased, but the corresponding deformation amount will be reduced, and it is impossible to simultaneously satisfy the requirements of large stiffness and large displacement in a large-power device. Therefore, a gas spring phase adjuster is designed.

[0003] However, the gas spring phase adjuster of the existing structure lacks a centering force. When the moving component of the phase adjuster is in a static or moving state, it is difficult to automatically maintain at a balance position. For example, when the phase adjuster is arranged in a vertical direction, under the action of gravity, the entire moving component will be offset downward, thereby affecting the performance of the phase adjuster. SUMMARY

[0004] The present application provides a magnetic centering mechanism, which can automatically maintain the moving component at a balance position and improve the performance of the gas spring phase adjuster.

[0005] The present application provides a magnetic centering mechanism suitable for a gas spring phase adjuster, which comprises a matched outer magnet assembly and an inner magnet assembly. The outer magnet assembly is arranged on a hot end piston and / or a cold end piston of the gas spring phase adjuster, and comprises a first outer magnet. The inner magnet assembly is arranged on an outer circumferential surface of a piston shaft cylinder of the gas spring phase adjuster, and comprises a first end magnet, a second end magnet and an intermediate magnet arranged between the first end magnet and the second end magnet. The first end magnet, the intermediate magnet and the second end magnet are sequentially arranged along an axis direction of the piston shaft cylinder. The intermediate magnet corresponds to the outer magnet, and the magnetic field direction of the intermediate magnet is the same as that of the first outer magnet. The magnetic field directions of the first end magnet and the second end magnet are opposite to that of the first outer magnet.

[0006] According to the magnetic centering mechanism provided by the present application, the first end magnet, the intermediate magnet and the second end magnet are sequentially connected or sequentially spaced.

[0007] The magnetic force centering mechanism provided by the application further comprises a first magnetic conducting sheet arranged on the inner magnet assembly on the side away from the outer magnet.

[0008] The magnetic force centering mechanism provided by the application further comprises a second magnetic conducting sheet arranged on the outer magnet assembly on the side away from the inner magnet.

[0009] The magnetic force centering mechanism provided by the application further comprises a third end magnet, the first end magnet, the intermediate magnet, the second end magnet and the third end magnet are arranged in sequence along the axis of the piston shaft cylinder; the outer magnet assembly comprises a second outer magnet, the first outer magnet and the second outer magnet are arranged in sequence along the axis of the piston shaft cylinder, the second outer magnet corresponds to the second end magnet, and the magnetic field direction of the second outer magnet is the same as that of the second end magnet; the magnetic field direction of the second outer magnet is opposite to that of the first outer magnet, and the magnetic field direction of the third end magnet is opposite to that of the second end magnet.

[0010] The magnetic force centering mechanism provided by the application further comprises a third end magnet, the first end magnet, the intermediate magnet, the second end magnet and the third end magnet are arranged in sequence along the axis of the piston shaft cylinder; the outer magnet assembly comprises a second outer magnet, the first outer magnet and the second outer magnet are arranged in sequence along the axis of the piston shaft cylinder, the second outer magnet corresponds to the second end magnet, and the magnetic field direction of the second outer magnet is the same as that of the second end magnet; the magnetic field direction of the second outer magnet is opposite to that of the first outer magnet, and the magnetic field direction of the third end magnet is opposite to that of the second end magnet.

[0011] The magnetic force centering mechanism provided by the application further comprises a third end magnet, the first end magnet, the intermediate magnet, the second end magnet and the third end magnet are arranged in sequence along the axis of the piston shaft cylinder; the outer magnet assembly comprises a second outer magnet, the first outer magnet and the second outer magnet are arranged in sequence along the axis of the piston shaft cylinder, the second outer magnet corresponds to the second end magnet, and the magnetic field direction of the second outer magnet is the same as that of the second end magnet; the magnetic field direction of the second outer magnet is opposite to that of the first outer magnet, and the magnetic field direction of the third end magnet is opposite to that of the second end magnet.

[0012] When the outer magnet assembly is arranged on the hot end piston of the gas spring phase adjuster, in the natural state, the matched outer magnet assembly and inner magnet assembly can divide the hot end spring cavity of the gas spring phase adjuster into two parts with equal volume.

[0013] When the first end magnet, the intermediate magnet and the second end magnet are arranged in sequence with intervals, the interval between the first end magnet and the intermediate magnet and the interval between the intermediate magnet and the second end magnet are both less than 30% of the length of the first end magnet.

[0014] The application further provides a gas spring phase adjuster, comprising a flange, a cold end cylinder, a cold end piston, a hot end cylinder, a hot end piston, a piston shaft cylinder, a piston shaft and a magnetic centering mechanism, the cold end cylinder is connected with a first end surface of the flange, the cold end piston is arranged in the cold end cylinder, so that a cold end spring cavity is formed among the flange, the cold end cylinder and the cold end piston; the hot end cylinder is connected with a second end surface of the flange, the hot end piston is arranged in the hot end cylinder, so that a hot end spring cavity is formed among the flange, the hot end cylinder and the hot end piston; the piston shaft cylinder is fixed in a central hole of the flange, one end of the piston shaft cylinder extends into the cold end spring cavity, and the other end of the piston shaft cylinder extends into the hot end spring cavity; the piston shaft cylinder is provided with a shaft hole through which the piston shaft passes, the piston shaft is in sliding fit with the shaft hole, a first end of the piston shaft passes through the shaft hole and is connected with the cold end piston, and a second end of the piston shaft is connected with the hot end piston; the magnetic centering mechanism is the magnetic centering mechanism mentioned above.

[0015] The gas spring phase adjuster provided by the application further comprises a thin-walled cylinder, the thin-walled cylinder is connected with the hot end piston, so that a gas chamber is formed between the thin-walled cylinder and the hot end piston.

[0016] The gas spring phase adjuster provided by the application further comprises a radiation-proof screen, the radiation-proof screen is arranged inside the thin-walled cylinder, and the radiation-proof screen is connected with the thin-walled cylinder.

[0017] The application further provides a thermoacoustic generator comprising the gas spring phase adjuster mentioned above.

[0018] The one or more technical solutions mentioned above in the application have at least one of the following technical effects:

[0019] The magnetic force centering mechanism provided by the application is suitable for a gas spring phase adjuster, and comprises a matched outer magnet assembly and an inner magnet assembly, wherein the outer magnet assembly is arranged on a hot end piston and / or a cold end piston of the gas spring phase adjuster, and comprises a first outer magnet; and the inner magnet assembly is arranged on an outer circumferential surface of a piston shaft cylinder of the gas spring phase adjuster, and comprises a first end magnet, a second end magnet and an intermediate magnet arranged between the first end magnet and the second end magnet, the first end magnet, the intermediate magnet and the second end magnet are sequentially arranged along an axis direction of the piston shaft cylinder, the intermediate magnet corresponds to the outer magnet, the magnetic field direction of the intermediate magnet is the same as that of the first outer magnet, and the magnetic field directions of the first end magnet and the second end magnet are opposite to that of the first outer magnet; that is, an attractive force is formed between the intermediate magnet and the outer magnet, so that a moving part of the gas spring phase adjuster can be kept at a balance position; when the moving part deviates from the balance position, the outer magnet will form a repulsive force with the first end magnet or the second end magnet, so as to push the moving part back to the balance position. Thus, the magnetic force centering mechanism provided by the application can automatically keep the moving part of the gas spring phase adjuster at the balance position, and thus the performance of the gas spring phase adjuster is improved.

[0020] The gas spring phase adjuster provided by the application comprises the above-mentioned magnetic force centering mechanism. Since the gas spring phase adjuster is provided with the above-mentioned magnetic force centering mechanism, the gas spring phase adjuster has all the advantages of the above-mentioned magnetic force centering mechanism, and thus the use performance of the gas spring phase adjuster is improved.

[0021] The thermoacoustic generator provided by the application comprises the above-mentioned gas spring phase adjuster. Since the thermoacoustic generator is provided with the above-mentioned gas spring phase adjuster, the thermoacoustic generator has all the advantages of the above-mentioned gas spring phase adjuster, and thus the use performance of the thermoacoustic generator is improved.

[0022] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description and the attached drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0024] Figure 1 is a structural schematic view of the magnetic force centering mechanism provided by the application;

[0025] Figure 2 is another structural schematic view of the magnetic centering mechanism provided by the present application;

[0026] Figure 3 is still another structural schematic view of the magnetic centering mechanism provided by the present application.

[0027] Reference signs:

[0028] 1: flange; 2: hot-end cylinder; 3: cold-end cylinder;

[0029] 4: hot-end piston; 5: cold-end piston; 6: shaft hole;

[0030] 7: piston shaft; 8: hot-end spring cavity; 9: cold-end spring cavity;

[0031] 10: thin-walled cylinder; 11: radiation-proof screen; 12: first outer-side magnet;

[0032] 13: first end magnet; 14: intermediate magnet; 15: second end magnet;

[0033] 16: first magnetic-conducting sheet; 17: third end magnet; 18: second outer-side magnet;

[0034] 19: second magnetic-conducting sheet; 20: piston shaft cylinder. DETAILED DESCRIPTION

[0035] The embodiments of the present application will be further described below in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0036] In the description of the embodiments of the present application, it should be noted that the terms “center”, “longitudinal”, “transverse”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms “first”, “second”, “third” are only used for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the embodiments of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "connected", "connected to", "connection" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] In the embodiments of the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0039] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0040] The specific embodiments of the magnetic return mechanism of the present application will be described below. Figures 1 to 3 The specific embodiments of the magnetic return mechanism of the present application will be described below.

[0041] The magnetic return mechanism of the present application is suitable for a gas spring phase adjuster, which comprises an outer magnet assembly and an inner magnet assembly matched with the outer magnet assembly, wherein the outer magnet assembly is arranged on a hot end piston 4 and / or a cold end piston 5 of the gas spring phase adjuster, and the outer magnet assembly comprises a first outer magnet 12. That is, according to actual use requirements, the outer magnet assembly can be arranged only on the hot end piston 4 of the gas spring phase adjuster, or only on the cold end piston 5 of the gas spring phase adjuster, or on both the hot end piston 4 and the cold end piston 5 of the gas spring phase adjuster.

[0042] The inner magnet assembly is arranged on the outer circumferential surface of the piston shaft cylinder 20 of the gas spring phase adjuster.

[0043] The inner magnet assembly comprises a first end magnet 13, a second end magnet 15 and an intermediate magnet 14 arranged between the first end magnet 13 and the second end magnet 15, and the first end magnet 13, the intermediate magnet 14 and the second end magnet 15 are sequentially arranged along the axial direction of the piston shaft cylinder 20. The intermediate magnet 14 corresponds to the outer magnet 12, that is, the intermediate magnet 14 is flush with the outer magnet 12 when the moving part of the gas spring phase adjuster is in a static state. The magnetic field direction of the intermediate magnet 14 is the same as that of the first outer magnet 12, and the magnetic field directions of the first end magnet 13 and the second end magnet 15 are opposite to that of the first outer magnet 12. The magnetic field directions of the outer magnet 12, the first end magnet 13, the intermediate magnet 14 and the second end magnet 15 are consistent with the radial direction of the piston shaft cylinder 20.

[0044] That is, the intermediate magnet 14 and the outer magnet 12 can form an attractive force, so that the moving part of the gas spring phase adjuster can be kept at the balance position; when the moving part deviates from the balance position, the outer magnet 12 will form a repulsive force with the first end magnet 13 or the second end magnet 15, so as to push the moving part back to the balance position. It should be noted that in the embodiment, the moving part comprises the hot end piston 4, the cold end piston 5 and the piston shaft 7 of the gas spring phase adjuster.

[0045] Experiments show that since the plurality of magnets in the inner magnet assembly can respectively generate a mutual force with the outer magnet assembly, when the inner magnet assembly and the outer magnet assembly slightly deviate from the balance position, the magnetic restoring force can quickly reach a larger and stable value, so that the magnetic force centering mechanism of the embodiment can generate a larger magnetic restoring force when the deviation is small, and is particularly suitable for keeping the moving part always in a position close to the balance, thereby ensuring that the gas spring phase adjuster has better use performance.

[0046] Therefore, the magnetic force centering mechanism of the embodiment can provide a centering force for the moving part of the gas spring phase adjuster, so as to automatically keep the moving part of the gas spring phase adjuster at the balance position, thereby improving the performance of the gas spring phase adjuster.

[0047] In some embodiments of the present application, as shown in Figure 1 The first end magnet 13, the intermediate magnet 14 and the second end magnet 15 are sequentially connected, thereby facilitating the installation and fixation of the inner magnet assembly.

[0048] Alternatively, in some other embodiments of the present application, as shown in Figure 2 the first end magnet 13, the middle magnet 14 and the second end magnet 15 can also be arranged in sequence with intervals. With this arrangement, since there is a certain gap between each magnet of the inner magnet assembly, it is more conducive to obtaining a more uniform magnetic restoring force when the moving part moves a larger displacement.

[0049] In some embodiments of the present application, as shown in Figure 2 the magnetic force centering mechanism further comprises a first magnetic conducting sheet 16 arranged on the inner magnet assembly on the side away from the outer magnet. By arranging the first magnetic conducting sheet 16 on the inner magnet assembly, the magnetic property of the inner magnet assembly can be enhanced.

[0050] In some embodiments of the present application, as shown in Figure 3 the inner magnet assembly further comprises a third end magnet 17, and the first end magnet 13, the middle magnet 14, the second end magnet 15 and the third end magnet 17 are arranged in sequence along the axis direction of the piston barrel 20. Correspondingly, the outer magnet assembly further comprises a second outer magnet 18, and the first outer magnet 12 and the second outer magnet 18 are arranged in sequence along the axis direction of the piston barrel 20, and the second outer magnet 18 corresponds to the second end magnet 15, and the magnetic field direction of the second outer magnet 18 is the same as that of the second end magnet 15. While the magnetic field direction of the second outer magnet 18 is opposite to that of the first outer magnet 12, and the magnetic field direction of the third end magnet 17 is opposite to that of the second end magnet 15.

[0051] According to actual use requirements, the number of magnets in the inner magnet assembly and the outer magnet assembly can be increased respectively. That is, the number of magnets in the inner magnet assembly can be set to at least three, and it is ensured that the number of magnets in the outer magnet assembly is two less than that in the inner magnet assembly, and each magnet in the outer magnet assembly is arranged one-to-one with each magnet in the middle part of the inner magnet assembly. With this arrangement, the centering force of the magnetic force centering mechanism can be further enhanced.

[0052] In some embodiments of the present application, as shown in Figure 3 the magnetic force centering mechanism further comprises a second magnetic conducting sheet 19 arranged on the outer magnet assembly on the side away from the inner magnet. By arranging the second magnetic conducting sheet 19 on the outer magnet assembly, the magnetic property of the outer magnet assembly can be enhanced.

[0053] In some embodiments of the present application, the lengths of the two magnets located at the two ends of the inner magnet assembly are equal, and the lengths of each of the magnets located in the middle of the inner magnet assembly are twice the length of the magnets located at the ends. The lengths of the magnets of the outer magnet assembly are equal to the lengths of the corresponding magnets of the inner magnet assembly. This arrangement can provide stronger centering force for the centering mechanism.

[0054] That is, in a specific embodiment, when the inner magnet assembly includes the first end magnet 13, the middle magnet 14 and the second end magnet 15, the length of the first end magnet 13 is equal to the length of the second end magnet 15, and the length of the middle magnet 14 is equal to the length of the first outer magnet 12. The length of the first end magnet 13 is slightly greater than or equal to the displacement of the moving part. The length of the first end magnet 13 is 1 / 2 of the length of the middle magnet 14.

[0055] In another specific embodiment, when the inner magnet assembly includes the first end magnet 13, the middle magnet 14, the second end magnet 15 and the third end magnet 17, the length of the first end magnet 13 is equal to the length of the third end magnet 17, the length of the middle magnet 14 is equal to the length of the first outer magnet 12, and the length of the second end magnet 15 is equal to the length of the second outer magnet 18. The length of the first end magnet 13 is slightly greater than or equal to the displacement of the moving part. The lengths of the middle magnet 14 and the second end magnet 15 are twice the length of the first end magnet 13.

[0056] In some embodiments of the present application, when the outer magnet assembly is arranged on the hot end piston 4 of the gas spring phase adjuster, in the natural state, the cooperating outer magnet assembly and inner magnet assembly can divide the hot end spring chamber 8 of the gas spring phase adjuster into two parts with equal volumes. This arrangement can enable the gas to shuttle in the gap between the outer magnet assembly and the inner magnet assembly when the moving part of the gas spring phase adjuster reciprocates, due to the change in volume between the hot end spring chamber 8 and the cold end spring chamber 9, thereby cooling the outer magnet assembly and the inner magnet assembly through the shuttling gas.

[0057] In some embodiments of the present application, when the outer magnet assembly is arranged on the cold end piston 5 of the gas spring phase adjuster, in the natural state, the cooperating outer magnet assembly and inner magnet assembly can divide the cold end spring chamber 9 of the gas spring phase adjuster into two parts with equal volumes. This arrangement can enable the gas to shuttle in the gap between the outer magnet assembly and the inner magnet assembly when the moving part of the gas spring phase adjuster reciprocates, due to the change in volume between the hot end spring chamber 8 and the cold end spring chamber 9, thereby cooling the outer magnet assembly and the inner magnet assembly through the shuttling gas.

[0058] In some embodiments of the present application, when the magnets in the inner magnet assembly are arranged in sequence with intervals, the interval between any two adjacent magnets is less than 30% of the length of the magnet at the end.

[0059] That is, in one specific embodiment, when the inner magnet assembly includes a first end magnet 13, an intermediate magnet 14, and a second end magnet 15, the length of the first end magnet 13 is equal to the length of the second end magnet 15. The interval between the first end magnet 13 and the intermediate magnet 14 and the interval between the intermediate magnet 14 and the second end magnet 15 are both less than 30% of the length of the first end magnet 13.

[0060] In another specific embodiment, when the inner magnet assembly includes a first end magnet 13, an intermediate magnet 14, a second end magnet 15, and a third end magnet 17, the length of the first end magnet 13 is equal to the length of the third end magnet 17. The interval between the first end magnet 13 and the intermediate magnet 14, the interval between the intermediate magnet 14 and the second end magnet 15, and the interval between the second end magnet 15 and the third end magnet 17 are all less than 30% of the length of the first end magnet 13.

[0061] On the other hand, as Figure 1 described above, the present application also provides a gas spring phase adjuster, which includes a flange 1, a cold end cylinder 3, a cold end piston 5, a hot end cylinder 2, a hot end piston 4, a piston shaft cylinder 20, a piston shaft 7, and a magnetic centering mechanism. The cold end cylinder 3 is connected to the first end face of the flange 1, the cold end piston 5 is arranged in the cold end cylinder 3, and the cold end piston 5 and the cold end cylinder 3 are in sliding sealing engagement, so that a cold end spring cavity 9 is formed between the flange 1, the cold end cylinder 3, and the cold end piston 5. The hot end cylinder 2 is connected to the second end face of the flange 1, the hot end piston 4 is arranged in the hot end cylinder 2, and the hot end piston 4 and the hot end cylinder 2 are in sliding sealing engagement, so that a hot end spring cavity 8 is formed between the flange 1, the hot end cylinder 2, and the hot end piston 4. The piston shaft cylinder 20 is fixedly arranged in the central hole of the flange 1, one end of the piston shaft cylinder 20 extends into the cold end spring cavity 9, and the other end of the piston shaft cylinder 20 extends into the hot end spring cavity 8. The piston shaft cylinder 20 is provided with a shaft hole 6 through which the piston shaft 7 passes, the piston shaft 7 and the shaft hole 6 are in sealing sliding engagement, the first end of the piston shaft 7 passes through the shaft hole 6 and is connected to the cold end piston 5, and the second end of the piston shaft 7 is connected to the hot end piston 4. That is, through the reciprocating movement of the piston shaft 7 in the shaft hole 6, the hot end piston 4 and the cold end piston 5 can be driven to move synchronously. The magnetic centering mechanism adopts the magnetic centering mechanism of the above-mentioned embodiments.

[0062] Due to the magnetic force centering mechanism of the gas spring phase adjuster, the gas spring phase adjuster has all the advantages of the magnetic force centering mechanism, and the use performance of the gas spring phase adjuster is improved. That is, by setting the magnetic force centering mechanism, the centering force can be provided for the moving part of the gas spring phase adjuster, so that the moving part of the gas spring phase adjuster is automatically kept in the balance position, and the performance of the gas spring phase adjuster is improved.

[0063] In some embodiments of the present application, the gas spring phase adjuster further comprises a thin-walled cylinder 10 connected with the hot end piston 4, so that a gas chamber is formed between the thin-walled cylinder 10 and the hot end piston 4. By setting the thin-walled cylinder 10, the heat buffering effect can be achieved.

[0064] In some embodiments of the present application, the gas spring phase adjuster further comprises a radiation shielding screen 11 arranged inside the thin-walled cylinder 10, and the radiation shielding screen 11 is connected with the inner wall of the thin-walled cylinder 10. By arranging one or more layers of radiation shielding screen 11 inside the thin-walled cylinder 10, the radiation heat transfer between the thin-walled cylinder 10 and the hot end piston 4 can be reduced.

[0065] In another aspect, the embodiments of the present application also provide a thermoacoustic generator comprising the gas spring phase adjuster of the above-mentioned embodiments. Due to the gas spring phase adjuster of the above-mentioned embodiments, the thermoacoustic generator has all the advantages of the gas spring phase adjuster of the above-mentioned embodiments, and the use performance of the thermoacoustic generator is improved.

[0066] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and 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. A magnetic centering mechanism adapted for use in a gas spring phase adjuster, characterized in that, The gas spring phase adjuster comprises a matched outer magnet assembly and an inner magnet assembly, wherein the outer magnet assembly is arranged on a hot end piston and / or a cold end piston of the gas spring phase adjuster, and the outer magnet assembly comprises a first outer magnet; the inner magnet assembly is arranged on an outer circumferential surface of a piston shaft cylinder of the gas spring phase adjuster, and the inner magnet assembly comprises a first end magnet, a second end magnet and an intermediate magnet arranged between the first end magnet and the second end magnet, the first end magnet, the intermediate magnet and the second end magnet are sequentially arranged along an axis direction of the piston shaft cylinder, the intermediate magnet corresponds to the outer magnet, and the intermediate magnet has the same magnetic field direction as the first outer magnet, the first end magnet and the second end magnet have opposite magnetic field directions to the first outer magnet; the inner magnet assembly further comprises a third end magnet, and the first end magnet, the intermediate magnet, the second end magnet and the third end magnet are sequentially arranged along the axis direction of the piston shaft cylinder; the outer magnet assembly comprises a second outer magnet, and the first outer magnet and the second outer magnet are sequentially arranged along the axis direction of the piston shaft cylinder, the second outer magnet corresponds to the second end magnet, and the second outer magnet has the same magnetic field direction as the second end magnet; the second outer magnet has opposite magnetic field direction to the first outer magnet, and the third end magnet has opposite magnetic field direction to the second end magnet.

2. The magnetic return means of claim 1, wherein, The first end magnet, the intermediate magnet and the second end magnet are sequentially connected or sequentially arranged with intervals.

3. The magnetic return means of claim 1, wherein, The inner magnet assembly further comprises a first magnetic conductive sheet arranged on a side of the inner magnet assembly away from the outer magnet.

4. The magnetic return means of claim 1, wherein, The outer magnet assembly further comprises a second magnetic conductive sheet arranged on a side of the outer magnet assembly away from the inner magnet.

5. A magnetic return means according to any one of claims 1 to 4, characterised in that, The first end magnet and the second end magnet have equal length, and the intermediate magnet has equal length to the first outer magnet; the length of the first end magnet is greater than or equal to the displacement of the hot end piston; the length of the first end magnet is 1 / 2 of the length of the intermediate magnet.

6. A magnetic return means according to any one of claims 1 to 4, characterised in that, When the outer magnet assembly is arranged on the hot end piston of the gas spring phase adjuster, in a natural state, the matched outer magnet assembly and the inner magnet assembly can divide the hot end spring cavity of the gas spring phase adjuster into two parts with equal volume. When the outer magnet assembly is arranged on the cold end piston of the gas spring phase adjuster, in a natural state, the matched outer magnet assembly and the inner magnet assembly can divide the cold end spring cavity of the gas spring phase adjuster into two parts with equal volume.

7. The magnetic return means of claim 2, wherein, When the first end magnet, the intermediate magnet and the second end magnet are sequentially arranged with intervals, the interval between the first end magnet and the intermediate magnet and the interval between the intermediate magnet and the second end magnet are both less than 30% of the length of the first end magnet.

8. A gas spring phase adjuster characterized by, The application relates to a magnetic return mechanism, which comprises a flange, a cold-end cylinder, a cold-end piston, a hot-end cylinder, a hot-end piston, a piston shaft cylinder, a piston shaft and the magnetic return mechanism, the cold-end cylinder is connected with a first end surface of the flange, the cold-end piston is arranged in the cold-end cylinder, so that a cold-end spring cavity is formed among the flange, the cold-end cylinder and the cold-end piston; the hot-end cylinder is connected with a second end surface of the flange, the hot-end piston is arranged in the hot-end cylinder, so that a hot-end spring cavity is formed among the flange, the hot-end cylinder and the hot-end piston; the piston shaft cylinder is fixedly arranged in a central hole of the flange, one end of the piston shaft cylinder extends into the cold-end spring cavity, and the other end of the piston shaft cylinder extends into the hot-end spring cavity; the piston shaft cylinder is provided with a shaft hole through which the piston shaft passes, the piston shaft is in sliding fit with the shaft hole, a first end of the piston shaft is connected with the cold-end piston through the shaft hole, and a second end of the piston shaft is connected with the hot-end piston; the magnetic return mechanism is the magnetic return mechanism as claimed in any one of claims 1 to 7.

9. A thermo-acoustic power generator, characterized in that The application relates to a gas spring phase adjuster, which comprises: The gas spring phase adjuster as claimed in claim 8.

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