Miniature power generation device

Abstract

The utility model discloses a miniature power generation device, which comprises a sound insulation cover and a miniature generator, the sound insulation cover is provided with a sound insulation cavity and a cavity opening communicated with the sound insulation cavity, the miniature generator comprises a stator and a rotor, the stator comprises a cover body and a coil assembly arranged on the cover body, the cover body is provided with a cover body through hole, and the coil assembly is arranged in the cover body through hole. The rotor comprises a rotor shell, a magnetic ring arranged on the peripheral wall of a shell body of the rotor shell and a rotating shaft extending outwards from the bottom wall of the shell body of the rotor shell, the coil assembly is suspended in the rotor shell, the position of the coil assembly corresponds to the position of the magnetic ring, the driven end of the rotating shaft penetrates through the cover body penetrating hole of the cover body, and the driven end of the rotating shaft penetrates through the cover body penetrating hole of the cover body. The cover body is installed on the soundproof cover in a mode of closing the cavity opening of the soundproof cover, and the rotor shell is suspended in the soundproof cavity of the soundproof cover. The sound insulation cover prevents sound waves of noise of the micro power generator from radiating outwards, so that the micro power generation device is more silent.

Description

Technical Field

[0001] The utility model relates to a power generation device, in particular to a micro power generation device. Background Art

[0002] The inventor disclosed a power generation device in a Chinese utility model patent with authorization announcement number CN220173037U, which includes a coil, a group of magnets, a circuit board, a rotor and a shell, wherein the coil is connected to the circuit board, wherein the rotor includes a cover and a linkage shaft extending outward from the cover, wherein a group of the magnets are arranged in the cover of the rotor, wherein the shell includes a shell and a cover and has a receiving cavity and a connecting channel, the cover is installed on the shell, the receiving cavity is formed between the cover and the shell, the connecting channel is arranged in the shell, and the connecting channel connects the receiving cavity of the shell and the outside, wherein the circuit board and the coil are respectively received in the receiving cavity of the shell, wherein at least a part of the cover of the rotor is rotatably received in the receiving cavity of the shell, the linkage shaft of the rotor extends from the receiving cavity to the outside of the shell, and the rotor is constructed so that a group of the magnets surround the coil. In the above patent, the rotor of the generator is exposed, which causes the noise generated by the generator when generating electricity to be directly radiated to the external environment, thereby causing the fitness equipment equipped with the generator to bring a poor fitness experience to the user. Utility Model Content

[0003] One object of the utility model is to provide a micro-generator, wherein the micro-generator is quieter when generating electricity, so as to allow fitness equipment equipped with the micro-generator to bring users a better fitness experience.

[0004] One object of the utility model is to provide a micro-generator, wherein the micro-generator covers the rotor shell of the micro-generator through a soundproof cover, and the cover body of the stator of the micro-generator closes the cavity of the soundproof cover, so that the soundproof cover can prevent the sound waves of the noise generated by the micro-generator during power generation from radiating outward, thereby making the micro-generator quieter during power generation.

[0005] One purpose of the utility model is to provide a micro-generator, wherein the soundproof cover is provided with a vacuum chamber to greatly improve the effect of the soundproof cover in preventing the sound waves of the noise generated by the micro-generator during power generation from radiating outward, thereby making the micro-generator quieter during power generation.

[0006] One object of the utility model is to provide a micro-generator, wherein the threading hole of the cover is sealed to prevent the sound waves of the noise generated by the micro-generator when generating electricity from radiating outward through the threading hole of the cover, so that the micro-generator is quieter when generating electricity. For example, the threading hole of the cover can be filled with glue to seal the gap between the cover and the wire with the cured glue.

[0007] According to one aspect of the present invention, the present invention provides a micro power generation device, comprising:

[0008] A soundproof cover, wherein the soundproof cover has a soundproof cavity and a cavity opening communicating with the soundproof cavity; and

[0009] A micro-generator, wherein the micro-generator comprises a stator and a rotor, the stator comprises a cover body and a coil assembly disposed on the cover body, the cover body has a cover body through hole, the rotor comprises a rotor shell, a magnetic ring disposed on the shell peripheral wall of the rotor shell, and a rotating shaft extending outward from the shell bottom wall of the rotor shell, the coil assembly is suspended inside the rotor shell, and the position of the coil assembly corresponds to the position of the magnetic ring, the driven end of the rotating shaft passes through the cover body through hole of the cover body, wherein the cover body is installed on the sound insulation cover in a manner of closing the cavity opening of the sound insulation cover, and the rotor shell is suspended in the sound insulation cavity of the sound insulation cover.

[0010] According to one embodiment of the utility model, the soundproof cover includes an inner cover body and an outer cover body and has a vacuum cavity, the inner cover body forms the soundproof cavity and the cavity opening, the outer cover body is located on the outside of the inner cover body, and the opening of the outer cover body and the opening of the inner cover body are sealedly connected to form the vacuum cavity between the outer cover body and the inner cover body.

[0011] According to one embodiment of the utility model, the inner cover body includes an inner bottom wall and an inner peripheral wall extending upward from the periphery of the inner bottom wall as a whole, and the outer cover body includes an outer bottom wall and an outer peripheral wall extending upward from the periphery of the outer bottom wall as a whole, a gap is provided between the inner bottom wall and the outer bottom wall to form a part of the vacuum chamber, a gap is provided between the inner peripheral wall and the outer peripheral wall to form another part of the vacuum chamber, and a top edge of the inner peripheral wall and a top edge of the outer peripheral wall are sealedly connected so that an opening of the outer cover body and an opening of the inner cover body are sealedly connected.

[0012] According to an embodiment of the utility model, the cover body has a threading hole, and the wire of the coil assembly passes through the threading hole of the cover body, wherein the inner wall of the cover body used to form the threading hole and the wire are sealed.

[0013] According to an embodiment of the utility model, the threading hole of the cover body is filled with glue, so that the cured glue seals the gap between the inner wall of the cover body used to form the threading hole and the wire.

[0014] According to one embodiment of the utility model, the micro-generator comprises a deformable sealing ring, which is sleeved on the wire with an interference fit, and the sealing ring is inserted into the threading hole of the cover body so that the sealing ring seals the gap between the inner wall of the cover body used to form the threading hole and the wire.

[0015] According to one embodiment of the utility model, the cover body includes a cover plate and an assembly column extending outward from the middle of the cover plate as a whole, the cover body is perforated through the cover plate and the assembly column, the coil assembly is fixedly mounted on the assembly column of the cover body, wherein the periphery of the cover plate and the sound insulation cover are screwed together so that the cover body is mounted on the sound insulation cover in a manner of closing the cavity of the sound insulation cover.

[0016] According to one embodiment of the utility model, the cover body includes a cover plate and an assembly column extending outward integrally from the middle of the cover plate, the cover body is perforated through the cover plate and the assembly column, the coil assembly is fixedly mounted on the assembly column of the cover body, wherein the cover plate has a cover plate screw hole, and the sound insulation cover has a cover body screw hole, wherein the micro-generator includes a screw, one end of the screw extends into the cover body screw hole of the sound insulation cover after passing through the cover plate screw hole of the cover plate, and the screw and the inner wall of the sound insulation cover for forming the cover body screw hole are screwed together.

[0017] According to an embodiment of the present invention, the cover body comprises a flange, and the flange integrally extends outward from the middle of the cover plate, and the extending direction of the flange is opposite to the extending direction of the assembly column.

[0018] According to an embodiment of the present utility model, the micro-generator includes a waterproof bearing, and the waterproof bearing is sleeved on the rotating shaft and installed on the cover body through-hole of the cover body.

[0019] According to an embodiment of the utility model, the inner wall of the soundproof cover is provided with a sound absorbing layer.

[0020] According to an embodiment of the utility model, the inner wall of the soundproof cover is provided with a sound wave reflecting layer.

[0021] Other advantages of the present invention will be further disclosed and explained in the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of a micro power generation device according to a preferred embodiment of the utility model.

[0023] Figure 2 It is a schematic diagram of an exploded view of the micro power generation device according to the above preferred embodiment of the utility model from one perspective.

[0024] Figure 3 It is a schematic diagram of an exploded view of the micro power generation device according to the above preferred embodiment of the utility model from another perspective.

[0025] Figure 4 It is a cross-sectional schematic diagram of the micro power generation device according to the above preferred embodiment of the utility model.

[0026] Figure 5 It is a cross-sectional schematic diagram of a first modified example of the micro-generator according to the above preferred embodiment of the utility model.

[0027] Figure 6 It is a cross-sectional schematic diagram of a second modified example of the micro-generator according to the above preferred embodiment of the utility model.

[0028] Figure 7 It is a cross-sectional schematic diagram of a third modified example of the micro-generator according to the above preferred embodiment of the utility model. DETAILED DESCRIPTION

[0029] Before describing in detail any embodiment of the utility model, it should be understood that the utility model is not limited to the construction and arrangement details of the components described below or illustrated in the following figures in its application. The utility model can have other embodiments and can be practiced or carried out in various ways. In addition, it should be understood that the words and terms used here are for the purpose of description and should not be considered as restrictive. The use of "including", "including" or "having" and its variations herein is intended to cover the items and their equivalents and additional items displayed below. Unless otherwise specified or limited, the terms "install", "connect", "support" and "couple" and their variations are widely used and cover direct installation and indirect installation, connection, support and connection. In addition, "connect" and "couple" are not limited to physical or mechanical connections or connections.

[0030] Furthermore, on the first aspect, in the disclosure of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore the above terms cannot be understood as limitations on the present invention; on the second aspect, the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" cannot be understood as a limitation on the quantity.

[0031] Refer to the attached drawings of the specification of this utility model Figures 1 to 4 A micro-generator according to a preferred embodiment of the present utility model will be disclosed and explained in the following description, wherein the micro-generator includes a micro-generator 10 and a soundproof cover 20.

[0032] Specifically, the micro-generator 10 includes a stator 11 and a rotor 12, wherein the stator 11 includes a cover 111 and a coil assembly 112, the cover 111 has a cover through hole 1111, and the coil assembly 112 is arranged on the cover 111, wherein the rotor 12 includes a rotor shell 121, a magnetic ring 122 and a rotating shaft 123, and the rotor shell 121 further includes a shell bottom wall 1211 and a peripheral edge of the shell bottom wall 1211 extending toward the inner wall 123. The rotor shell 121 has a housing peripheral wall 1212 extending upward, the magnetic ring 122 is arranged on the housing peripheral wall 1212 of the rotor shell 121, the rotating shaft 123 extends outward from the housing bottom wall 1211, wherein the coil assembly 112 of the stator 11 is suspended inside the rotor shell 121, and the position of the coil assembly 112 corresponds to the position of the magnetic ring 122, and the driven end 1231 of the rotating shaft 123 passes through the cover body through hole 1111 of the cover body 111. When the driven end 1231 of the rotating shaft 123 drives the rotating shaft 123 to drive the rotor shell 121 and the magnetic ring 122 to rotate, the coil assembly 112 of the stator 11 cuts the magnetic flux lines of the magnetic ring 122 to generate current, so that the micro-generator 10 generates electricity.

[0033] The cover body 111 includes a cover plate 1112 and an assembly column 1113 extending outward from the middle of the cover plate 1112 in an integral manner. The cover body through hole 1111 of the cover body 111 passes through the cover plate 1112 and the assembly column 1113. The coil assembly 112 is fixedly mounted on the assembly column 1113 of the cover body 111 to set the coil assembly 112 on the cover body 111.

[0034] In order to fix the coil assembly 112 on the assembly column 1113 of the cover body 111, in this specific example of the micro-power generation device of the present invention, the coil assembly 112 includes a coil frame 1121 and a coil 1122 wound on the coil frame 1121, the coil frame 1121 has a frame through hole 11211, and the assembly column 1113 of the cover body 111 is inserted into the frame through hole 11211 of the coil frame 1121 by interference fit to fit the coil frame 1121 on the assembly column 1113, thereby fixedly installing the coil assembly 112 on the assembly column 1113 of the cover body 111.

[0035] In addition, the coil assembly 112 includes a wire 1123, and the wire 1123 is connected to the coil 1122 to extract the electric energy generated by the coil 1122. Preferably, in this specific example of the micro-generator of the present invention, the cover 111 has a threading hole 1114, and the wire 1123 passes through the threading hole 1114 of the cover 111.

[0036] The magnetic ring 122 of the rotor 12 can be a complete ring or surrounded by multiple magnetic blocks, and the micro-generator of the present invention is not limited in this respect. In addition, the magnetic ring 122 can be bonded to the housing peripheral wall 1212 of the rotor shell 121 of the rotor 12 by, but not limited to, glue.

[0037] The specific manner in which the rotating shaft 123 is arranged on the housing bottom wall 1211 of the rotor housing 121 is not limited in the micro-generator of the present utility model, as long as the rotating shaft 123 can drive the rotor housing 121 to rotate synchronously when rotating. For example, in some embodiments, the end of the rotating shaft 123 can be riveted to the housing bottom wall 1211 of the rotor housing 121, in other embodiments, the end of the rotating shaft 123 can be welded to the housing bottom wall 1211 of the rotor housing 121, and in still other embodiments, the rotor 123 and the housing bottom wall 1211 of the rotor housing 121 are integrated.

[0038] Continue to refer to the attached Figure 4The micro-generator 10 includes at least one waterproof bearing 13, wherein the waterproof bearing 13 is sleeved on the rotating shaft 123 and the cover through-hole 1111 installed on the cover 111, so that the coil assembly 112 of the stator 11 is suspended inside the rotor shell 121 by the waterproof bearing 13, and the waterproof bearing 13 can prevent the sound waves of the noise generated by the micro-generator 10 during power generation from radiating outward, so that the micro-generator device is quieter during power generation.

[0039] Preferably, in the attached Figures 1 to 4 In the specific example of the micro-generator of the present invention shown, the number of the waterproof bearings 13 is two, and the two waterproof bearings 13 are respectively mounted on different positions of the rotating shaft 123, wherein the two waterproof bearings 13 can not only prevent the rotating shaft 123 from being deflected during rotation, but also further prevent the sound waves of the noise generated by the micro-generator 10 during power generation from radiating outward, so that the micro-generator is quieter during power generation.

[0040] The soundproof cover 20 has a soundproof cavity 21 and a cavity 22 connected to the soundproof cavity 21, wherein the cover 111 is installed on the soundproof cover 20 in a manner of closing the cavity 22 of the soundproof cover 20, and the rotor shell 121 of the rotor 12 is suspended in the soundproof cavity 21 of the soundproof cover 20. In other words, the main body of the micro-generator 10 composed of the coil assembly 112 of the stator 11 and the rotor shell 121 and the magnetic ring 122 of the rotor 12 is suspended in the soundproof cavity 21 of the soundproof cover 20, so that the sound waves of the noise generated by the micro-generator 10 during power generation can be prevented from radiating outward by the soundproof cover 20, so that the micro-generator device is quieter during power generation, thereby allowing the fitness equipment equipped with the micro-generator device to bring users a better fitness experience.

[0041] In order to prevent the sound waves of the noise generated by the micro-generator 10 during power generation from radiating outward through the threading hole 1114 of the cover body 111, in the micro-generator device of the present invention, the inner wall of the cover body 111 for forming the threading hole 1114 and the wire 1123 of the coil assembly 112 are sealed.

[0042] Reference Figure 4 In this specific example of the micro-power generation device of the present invention, the threading hole 1114 of the cover body 111 can be filled with glue so that the gap between the inner wall of the cover body 111 used to form the threading hole 1114 and the wire 1123 of the coil assembly 112 can be sealed by the cured glue.

[0043] Optionally, in the attached Figure 5 In this specific example of the micro-generator of the utility model shown, the micro-generator includes a deformable sealing ring 30, which can be a rubber ring or a silicone ring, wherein the sealing ring 30 is interference fit on the wire 1123 of the coil assembly 112, and the sealing ring 30 is inserted into the threading hole 1114 of the cover body 111, so that the sealing ring 30 seals the gap between the inner wall of the cover body 111 for forming the threading hole 1114 and the wire 1123 of the coil assembly 112.

[0044] Continue to refer to the attached Figure 4 The soundproof cover 20 includes an inner cover body 23 and an outer cover body 24 and a vacuum chamber 25. The inner cover body 23 forms the soundproof chamber 21 and the chamber opening 22 of the soundproof cover 20. The outer cover body 24 is located on the outside of the inner cover body 23, and the opening of the outer cover body 24 and the opening of the inner cover body 23 are sealed and connected to form the vacuum chamber 25 between the outer cover body 24 and the inner cover body 23. The vacuum chamber 25 can greatly improve the effect of the soundproof cover 20 in preventing the sound waves generated by the micro-generator 10 during power generation from radiating outward, thereby making the micro-generator 10 quieter during power generation.

[0045] It is worth mentioning that the materials of the inner cover 23 and the outer cover 24 of the soundproof cover 20 are not limited in the micro-generator of the utility model. Figures 1 to 4 In the specific example of the micro-generator of the present invention shown, the inner cover body 23 and the outer cover body 24 of the sound insulation cover 20 are made of stainless steel, such as 201 stainless steel or 304 stainless steel.

[0046] Further, the inner layer cover body 23 includes an inner layer bottom wall 231 and an inner layer peripheral wall 232 extending upward from the periphery of the inner layer bottom wall 231 as a whole, and correspondingly, the outer layer cover body 24 includes an outer layer bottom wall 241 and an outer layer peripheral wall 242 extending upward from the periphery of the outer layer bottom wall 241 as a whole, wherein there is a gap between the inner layer bottom wall 231 and the outer layer bottom wall 241 to form a part of the vacuum chamber 25 between the inner layer bottom wall 231 and the outer layer bottom wall 241, wherein there is a gap between the inner layer peripheral wall 232 and the outer layer peripheral wall 242 to form another part of the vacuum chamber 25 between the inner layer peripheral wall 232 and the outer layer peripheral wall 242, and the top edge of the inner layer peripheral wall 232 and the top edge of the outer layer peripheral wall 242 are sealedly connected so that the opening of the outer layer cover body 24 and the opening of the inner layer cover body 23 are sealedly connected.

[0047] Continue to refer to the attached Figure 4 , the periphery of the cover plate 1112 of the cover body 111 and the soundproof cover 20 are screwed together, so that the cover body 111 is installed on the soundproof cover 20 in a manner of closing the cavity 22 of the soundproof cover 20. Specifically, in this specific example of the micro-power generation device of the present utility model, the periphery of the cover plate 1112 of the cover body 111 has a screw-mounted arm 11121, the inner side of the screw-mounted arm 11121 has an internal thread structure, and the opening of the soundproof cover 20 has an external thread structure. The internal thread structure of the screw-mounted arm 11121 of the cover plate 1112 and the external thread structure of the soundproof cover 20 cooperate with each other to allow the periphery of the cover plate 1112 of the cover body 111 and the soundproof cover 20 to be screwed together. Optionally, in other examples of the micro-generator of the present utility model, the outer side of the screw-mounted arm 11121 of the cover plate 1112 has an external thread structure, and the opening of the soundproof cover 20 has an internal thread structure, and the external thread structure of the screw-mounted arm 11121 of the cover plate 1112 and the internal thread structure of the soundproof cover 20 cooperate with each other to allow the periphery of the cover plate 1112 of the cover body 111 and the soundproof cover 20 to be screwed. Optionally, in the attached Figure 6 In this specific example of the micro-generator of the present invention shown, the cover plate 1112 of the cover body 111 has at least one cover plate screw hole 11122, and the sound insulation cover 20 has at least one cover body screw hole 26, and the position of the cover plate screw hole 11122 of the cover plate 1112 corresponds to the position of the cover body screw hole 26 of the sound insulation cover 20, wherein the micro-generator also includes at least one screw 40, one end of the screw 40 extends into the cover body screw hole 26 of the sound insulation cover 20 after passing through the cover plate screw hole 11122 of the cover plate 1112, and the screw 40 and the inner wall of the sound insulation cover 20 for forming the cover body screw hole 26 are screwed together, so that the cover body 111 is installed on the sound insulation cover 20 in a manner of closing the cavity 22 of the sound insulation cover 20.

[0048] Preferably, the number of the cover screw holes 11122 of the cover plate 1112 is multiple, and these cover screw holes 11122 are distributed in an array along the edge of the cover plate 1112. Correspondingly, the number of the cover body screw holes 26 of the sound insulation cover 20 is multiple, and these cover body screw holes 26 are distributed in an array along the cavity opening 22. The positions of these cover screw holes 11122 of the cover plate 1112 and the positions of these cover body screw holes 26 of the sound insulation cover 20 correspond one to one. The number of the screws 40 is also multiple, and one end of each of the screws 40 extends into each of the cover body screw holes 26 of the sound insulation cover 20 after passing through each of the cover screw holes 11122 of the cover plate 1112, so as to reliably install the cover body 111 on the sound insulation cover 20 and ensure that the cover plate 111 closes the cavity opening 22 of the sound insulation cover 20.

[0049] Continue to refer to the attached Figure 4 The cover body 111 further includes a flange 1115, which integrally extends outward from the middle of the cover plate 1112, and the extension direction of the flange 1115 is opposite to the extension direction of the mounting column 1113, wherein the flange 1115 is used to mount the micro-generator on other equipment. Preferably, the flange 1115 has at least one mounting hole 11151, which is used to mount the end of a screw, and the micro-generator is mounted on other equipment by the screw.

[0050] Attached Figure 7 A modified example of the micro power generation device of the utility model is shown, and the attached Figures 1 to 4 The micro power generation device shown is different in that Figure 7 In this specific example of the micro-generator shown, the inner wall of the soundproof cover 20 is provided with a sound-absorbing layer 27. When the sound waves generated by the micro-generator 10 during power generation are radiated to the sound-absorbing layer 27 of the soundproof cover 20, the sound-absorbing layer 27 can absorb a part of the sound waves, thereby achieving the effect of further reducing noise, which makes the micro-generator quieter during power generation. Optionally, in other optional examples of the micro-generator of the utility model, the inner wall of the soundproof cover 20 is provided with a sound wave reflecting layer. When the sound waves generated by the micro-generator 10 during power generation are radiated to the sound wave emitting layer of the soundproof cover 20, the sound wave reflecting layer can reflect the sound waves toward the direction of the rotor shell 121, thereby preventing the sound waves from radiating to the outside of the micro-generator, so as to achieve the effect of further reducing noise, which makes the micro-generator quieter during power generation.

[0051] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A micro power generation device, characterized in that: include: A soundproof cover, wherein the soundproof cover has a soundproof cavity and a cavity opening communicating with the soundproof cavity; and A micro-generator, wherein the micro-generator comprises a stator and a rotor, the stator comprises a cover body and a coil assembly disposed on the cover body, the cover body has a cover body through hole, the rotor comprises a rotor shell, a magnetic ring disposed on the shell peripheral wall of the rotor shell, and a rotating shaft extending outward from the shell bottom wall of the rotor shell, the coil assembly is suspended inside the rotor shell, and the position of the coil assembly corresponds to the position of the magnetic ring, the driven end of the rotating shaft passes through the cover body through hole of the cover body, wherein the cover body is installed on the sound insulation cover in a manner of closing the cavity opening of the sound insulation cover, and the rotor shell is suspended in the sound insulation cavity of the sound insulation cover.

2. The micro-power generation device according to claim 1, wherein the soundproof cover comprises an inner cover body and an outer cover body and has a vacuum cavity, the inner cover body forms the soundproof cavity and the cavity opening, the outer cover body is located on the outside of the inner cover body, and the opening of the outer cover body and the opening of the inner cover body are sealedly connected to form the vacuum cavity between the outer cover body and the inner cover body.

3. A micro-power generation device according to claim 2, wherein the inner cover body includes an inner bottom wall and an inner peripheral wall extending upward from the periphery of the inner bottom wall as a whole, and the outer cover body includes an outer bottom wall and an outer peripheral wall extending upward from the periphery of the outer bottom wall as a whole, a gap is provided between the inner bottom wall and the outer bottom wall to form a part of the vacuum cavity, a gap is provided between the inner peripheral wall and the outer peripheral wall to form another part of the vacuum cavity, and a top edge of the inner peripheral wall and a top edge of the outer peripheral wall are sealedly connected so that an opening of the outer cover body and an opening of the inner cover body are sealedly connected.

4. The micro-generator according to claim 1, wherein the cover has a threading hole, and the wire of the coil assembly passes through the threading hole of the cover, wherein the inner wall of the cover for forming the threading hole and the wire are sealed.

5. The micro-generator according to claim 4, wherein the threading hole of the cover is filled with glue, so that the gap between the inner wall of the cover used to form the threading hole and the wire is sealed by the cured glue.

6. The micro-generator according to claim 4, wherein the micro-generator comprises a deformable sealing ring, the sealing ring is sleeved on the wire with an interference fit, and the sealing ring is inserted into the threading hole of the cover body so that the sealing ring seals the gap between the inner wall of the cover body used to form the threading hole and the wire.

7. A micro-power generation device according to any one of claims 1 to 6, wherein the cover body comprises a cover plate and an assembly column extending outward from the middle of the cover plate as a whole, the cover body is perforated through the cover plate and the assembly column, the coil assembly is fixedly mounted on the assembly column of the cover body, wherein the periphery of the cover plate and the sound insulation cover are screwed together so that the cover body is mounted on the sound insulation cover in a manner of closing the cavity of the sound insulation cover.

8. A micro-generator according to any one of claims 1 to 6, wherein the cover body comprises a cover plate and an assembly column extending outward from the middle of the cover plate as a whole, the cover body is perforated through the cover plate and the assembly column, the coil assembly is fixedly mounted on the assembly column of the cover body, wherein the cover plate has a cover plate screw hole, and the sound insulation cover has a cover body screw hole, wherein the micro-generator comprises a screw, one end of the screw extends into the cover body screw hole of the sound insulation cover after passing through the cover plate screw hole of the cover plate, and the screw is screwed to the inner wall of the sound insulation cover for forming the cover body screw hole.

9. The micro-generator according to claim 7, wherein the cover body comprises a flange, the flange integrally extends outward from the middle of the cover plate, and the extending direction of the flange is opposite to the extending direction of the assembly column.

10. The micro-generator according to any one of claims 1 to 6, wherein the micro-generator comprises a waterproof bearing, and the waterproof bearing is sleeved on the rotating shaft and mounted on the cover through hole of the cover.

11. The micro-generator according to any one of claims 1 to 6, wherein the inner wall of the soundproof cover is provided with a sound absorbing layer.

12. The micro-generator according to any one of claims 1 to 6, wherein the inner wall of the soundproof cover is provided with a sound wave reflecting layer.

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