A charging pile noise reduction device

Abstract

The present invention relates to a charging pile noise reduction device, comprising a shock filter box (3) connected to the outside of a heat dissipation fan (2), a fan housing (4) and a noise reduction body (5) arranged in the shock filter box (3), a cone noise reduction device (51), a cone fixing block (52) and a noise reduction hole area (53) in the noise reduction body (5), and a noise reflection sheet (511) and a noise reduction hole (512) are arranged on each surface of the cone noise reduction device (51); the end surface of the noise reduction body (5) is connected to a dustproof device (6), and the dustproof device (6) includes an electrostatic dustproof net (61), an anode device (63) and a cathode device (64). The advantages of the present invention are that the pneumatic noise transmitted from the pile body is greatly reduced and reduced, while taking into account the combination of noise reduction and heat dissipation functions inside the pile body, effectively filtering external dust and buffering the mechanical noise generated by the vibration of the heat dissipation fan when it is working.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle charging equipment, and in particular to a charging pile noise reduction device. Background Art

[0002] With the rapid development of new energy vehicle technology and the growing social demand, new energy vehicles are gradually entering thousands of households. At the same time, the demand for new energy electric vehicle charging piles is also increasing. When the charging pile is working, a large amount of heat will be generated in the power module area. The heat accumulation will damage the electronic components inside the pile body. At present, air cooling is mainly used to dissipate heat from the pile body. However, with the aging of the fan and the influence of external dust entering the fan and damaging the fan, the heat dissipation fan will generate a large noise when working, which seriously affects customer satisfaction and the lives of surrounding residents. Therefore, it is very necessary and significant to reduce the noise of the charging pile.

[0003] At present, the noise reduction method adopted in this situation has the following defects and shortcomings:

[0004] (1) The current method of noise reduction for charging piles is to wrap noise reduction materials around the cooling fan. This method cannot effectively reduce the noise of the system fan transmitted from the pile body;

[0005] (2) Currently, the heat dissipation fan is mainly placed at the boundary of the charging pile shell, and a dust-proof net and dust-proof cotton are set at the position directly opposite the fan to prevent dust from entering the fan and the inside of the pile body. When dust blocks the dust-proof net and dust-proof cotton, it cannot effectively prevent dust from entering the fan, and will block the heat from the inside of the pile body from being discharged, seriously affecting the heat dissipation of the pile body.

[0006] (3) Currently, the cooling fan is mainly fixed to the pile frame by screws. The cooling fan will vibrate continuously when working. If the torque is insufficient when tightening the screws, the tightening screws will gradually loosen, and the vibration noise generated by the fan will gradually increase when working. Summary of the invention

[0007] The purpose of the present invention is to solve the problems of poor noise reduction effect, influence on pile heat dissipation and unstable installation method of existing noise reduction devices, and to provide a charging pile noise reduction device, which reflects, consumes and absorbs noise, greatly reduces and reduces the aerodynamic noise transmitted from the pile body, while taking into account the combination of noise reduction and heat dissipation functions inside the pile body, effectively filtering external dust and buffering the mechanical noise generated by the vibration of the heat dissipation fan when working.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A charging pile noise reduction device comprises a connected charging pile body and a heat dissipation fan, a shock filter box is connected to the outside of the heat dissipation fan, a fan housing matched with the heat dissipation fan is arranged in the shock filter box, the heat dissipation fan is nested in one side of the fan housing, and the other side of the fan housing is connected to a noise reduction body, the noise reduction body comprises a cone noise reduction device, a cone fixing block and a noise reduction hole area, the cone noise reduction device is connected to the inner wall of the noise reduction body through the cone fixing block, and a noise reduction hole area composed of a porous medium material is arranged between two adjacent cone fixing blocks for reflecting, consuming and absorbing noise;

[0010] A noise reflection sheet and a noise reduction hole are arranged on each surface of the cone noise reduction device, and a cone lower cover is arranged at the bottom of the cone noise reduction device, and the cone lower cover is fixedly connected with the cone fixing block through the cone lower cover.

[0011] Furthermore, a circular cap seat is connected to the center of the inner wall of the cone noise reduction device, and a supporting device that cooperates with each other is provided in the inner cavity of the cone noise reduction device. The supporting device includes an upper movable frame, a circular cap connecting piece and a lower supporting rod. The upper end of the movable frame is connected to the top of the cone noise reduction device, and the lower end is provided with a spherical connecting block. The spherical connecting block is slidably connected to the circular hole at the upper end of the supporting rod, and the lower end of the supporting rod is fixedly connected to the middle part of the lower cover of the vertebral body. One end of the three circular cap connecting pieces is connected to the movable frame through a sliding block, and the other end is connected to the circular cap seat accordingly, and the angle between two adjacent circular cap connecting pieces is 120°, so as to support the surface of the cone.

[0012] Furthermore, the circular cap connector includes a hemispherical cap, an arc-shaped connector, a connecting rod, a fixed cylinder and a shape memory spring. The bottom of the hemispherical cap is provided with an arc-shaped groove, the arc-shaped connector is connected to the arc-shaped groove by a fixing bolt, the upper end of the connecting rod is connected to the middle part of the arc-shaped connector by a small bolt, the upper part of the fixed cylinder is provided with an upper end cover, and the lower part is provided with a lower end cover, a shape memory spring is connected between the upper end cover and the lower end cover, the lower end of the connecting rod is connected to the upper end cover of the fixed cylinder, and the lower end cover of the fixed cylinder is fixedly connected to the sliding block, so as to drive the deformation of the vertebral support by sensing changes in temperature.

[0013] Furthermore, the shape memory spring is a temperature-sensitive shape memory spring.

[0014] Furthermore, the conical fixing blocks are evenly spaced on the inner wall of the noise reduction body, and the axis of the conical fixing blocks is parallel to the axis of the noise reduction body. One side of the conical fixing block is an arc-shaped surface, and its curvature is the same as the curvature of the inner wall of the noise reduction body, so that the fixing block and the inner wall of the noise reduction body can fit tightly.

[0015] Furthermore, a group of fixing slots matching with the cone fixing block are provided on the inner wall of the noise reduction body, each cone fixing block is fastened to the corresponding fixing slot, and each cone fixing block is connected to a group of regular tetrahedral cone noise reduction devices, which are also arranged along the axis of the cone fixing block to complete the connection between the cone noise reduction device and the cone fixing block, and the connection between the cone fixing block and the noise reduction body.

[0016] Furthermore, the noise reflection sheet is arranged in the middle of each surface of the cone noise reduction device, and the noise reduction holes are distributed around the noise reflection sheet.

[0017] Furthermore, the shock filtering box includes a shock filtering gasket made of shock filtering material, which is used to filter the vibration generated when the fan is working and reduce the vibration noise generated when the heat dissipation fan is working.

[0018] Furthermore, the end face of the noise reduction body is connected to a dustproof device, which includes an electrostatic dustproof net that matches the end face of the noise reduction body. A pair of arc plates are connected inside the dustproof device, which are arranged opposite to each other and have anode devices and cathode devices fixed thereon, respectively, to generate high-voltage static electricity on the dustproof net to gather and clean dust.

[0019] Furthermore, the fan housing, noise reduction body and dust prevention device are all arranged in the middle of the shock filter box, and their axes coincide with the axis of the shock filter box.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] (1) In order to reduce the aerodynamic noise inside the pile body, the porous medium noise reduction hole area and the cone noise reduction device are arranged in combination inside the pile body, and the cone noise reduction devices are arranged in a staggered manner, which can reflect the noise inside the pile in multiple directions. The reflected noise sound waves enter the noise absorption holes, realizing the reflection, consumption and absorption functions of the noise, which can effectively reduce and reduce the aerodynamic noise transmitted from the pile body;

[0022] (2) The temperature-sensitive self-deformable bracket inside the cone noise reduction device can autonomously adjust the angle between the cone surface and the bracket according to the temperature at different positions inside the noise reduction body, thereby reducing the blocking effect of the cone noise reduction device on hot air, taking into account the noise reduction and heat dissipation functions inside the pile body, and having a high degree of automation;

[0023] (3) A vibration filter structure is set on the outside of the cooling fan to effectively buffer the mechanical noise generated by the vibration of the cooling fan when it is working;

[0024] (4) Installing a multi-layer electrostatic dust screen at the air outlet can effectively reduce the entry of external dust into the pile body and avoid the damage of dust to the system fan and electronic components. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a noise reduction principle diagram of the charging pile noise reduction device of the present invention;

[0026] Figure 2 An exploded view of the charging pile noise reduction device of the present invention;

[0027] Figure 3 It is a structural schematic diagram of the noise reduction body of the present invention;

[0028] Figure 4 A three-dimensional diagram of the cone noise reduction device of the present invention;

[0029] Figure 5 It is a front view of the cone noise reduction device of the present invention;

[0030] Figure 6 An exploded view of the internal structure of the cone noise reduction device of the present invention;

[0031] Figure 7 It is a front view of the supporting device of the present invention;

[0032] Figure 8 is a top view of the support device of the present invention;

[0033] Fig. 9 It is a structural exploded view of the circular cap connector of the present invention;

[0034] Fig.10 is a structural diagram of the dustproof device of the present invention;

[0035] Fig.11 A three-dimensional diagram of the shock filter box of the present invention;

[0036] Fig.12 It is a front view of the charging pile body of the present invention;

[0037] Fig.13 It is a rear view of the charging pile body of the present invention;

[0038] Fig.14 It is a cross-sectional schematic diagram of a charging pile body of the present invention;

[0039] Fig.15 It is a schematic diagram of a porous medium material in the prior art;

[0040] Fig.16 This is a schematic diagram of the sound absorption and noise reduction of porous medium materials in the prior art. DETAILED DESCRIPTION

[0041] Example 1

[0042] In order to make the present invention more clear, a charging pile noise reduction device of the present invention is further described below in conjunction with the accompanying drawings. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] See also Figure 1 , Figures 12-14 A charging pile noise reduction device comprises a connected charging pile 1 and a heat dissipation fan 2, characterized in that:

[0044] See also Figure 1 , Fig.11 The outer side of the heat dissipation fan 2 is connected with a shock filter box 3, and the shock filter box 3 includes a shock filter gasket made of a shock filter material, which is used to filter the vibration generated when the fan is working and reduce the vibration noise generated when the heat dissipation fan is working;

[0045] See also Figure 1 , Figure 2 A fan housing 4 matching with the heat dissipation fan 2 is provided in the shock filter box 3, the heat dissipation fan 2 is nested on the hub 4a of the fan housing 4, and the other side of the fan housing 4 is connected to the noise reduction body 5;

[0046] See also Figure 2 , Figure 3 The noise reduction body 5 includes a cone noise reduction device 51, a cone fixing block 52 and a noise reduction hole area 53. The cone fixing blocks 52 are evenly spaced on the inner wall of the noise reduction body 5, and the axis of the cone fixing block 52 is parallel to the axis of the noise reduction body 5. A group of fixing slots 54 matching the cone fixing blocks 52 are provided on the inner wall of the noise reduction body 5. Each cone fixing block 52 is fastened to the corresponding fixing slot 54. A noise reduction hole area 53 composed of a porous medium material is provided between two adjacent cone fixing blocks 52. A group of regular tetrahedral cone noise reduction devices 51 are connected to each cone fixing block 52. The cone noise reduction device 51 is also arranged along the axis of the cone fixing block 52 to reflect, consume and absorb noise.

[0047] See also Figure 3 , Figure 4 and Figure 5 A noise reflection sheet 511 and a noise reduction hole 512 are provided on each surface of the cone noise reduction device 51. The noise reflection sheet 511 is arranged in the middle of each surface of the cone noise reduction device 51. The noise reduction holes 512 are distributed around the noise reflection sheet 511. A cone lower cover 513 is provided at the bottom of the cone noise reduction device 51, and the cone lower cover 513 is connected to the cone fixing block 52;

[0048] See also Figure 6 , Figure 7 and Figure 8, the inner wall center of the cone noise reduction device 51 is connected with a circular cap seat 7, and the inner cavity of the cone noise reduction device 51 is provided with a supporting device 8 that cooperates with each other. The supporting device 8 includes an upper movable frame 81, a circular cap connector 82 and a lower support rod 83. The upper end of the movable frame 81 is connected to the top of the cone noise reduction device 51, and the lower end is provided with a spherical connecting block 81a. The spherical connecting block 81a is slidably connected to the upper circular hole of the support rod 83, and the lower end of the support rod 83 is fixedly connected to the middle part of the vertebral lower cover 513. One end of the three circular cap connectors 82 is connected to the movable frame 81 through a sliding block 9, and the other end is connected to the circular cap seat 7 correspondingly, and the angle between two adjacent circular cap connectors 82 is 120°, so as to support the surface of the cone;

[0049] See also Figure 7 and Fig. 9 The circular cap connector 82 includes a hemispherical cap 821, an arc-shaped connector 822, a connecting rod 823, a fixing cylinder 824 and a shape memory spring 825. An arc-shaped groove 821a is provided at the bottom of the hemispherical cap 821. The arc-shaped connector 822 is connected to the arc-shaped groove 821a by a fixing bolt 10. The upper end of the connecting rod 823 is connected to the middle part of the arc-shaped connector 822 by a small bolt 11. The upper part of the fixing cylinder 824 is provided with an upper end cover 824a, and the lower part is provided with a lower end cover 824b. A shape memory spring 825 is connected between the upper end cover 824a and the lower end cover 824b. The shape memory spring 825 is a temperature-sensitive shape memory spring. The lower end of the connecting rod 823 is connected to the upper end cover 824a of the fixing cylinder 824, and the lower end cover 824b of the fixing cylinder 824 is fixedly connected to the sliding block 9, so as to drive the deformation of the vertebral support through temperature sensing changes.

[0050] See also Figure 2 and Fig.10 The end surface of the noise reduction body 5 is connected with a dustproof device 6, which includes an electrostatic dustproof net 61 that matches the end surface of the noise reduction body 5. A pair of arc plates 62 are connected inside the dustproof device 6. The arc plates 62 are arranged opposite to each other and are respectively fixed with an anode device 63 and a cathode device 64 to generate high-voltage static electricity on the dustproof net to collect and clean the dust;

[0051] In this embodiment, the fan housing 4, the noise reduction body 5 and the dust prevention device 6 are all arranged in the middle of the shock filter box 3, and their axes coincide with the axis of the shock filter box 3.

[0052] In this embodiment, one side of the cone fixing block 52 is an arc-shaped surface, and its curvature is the same as the curvature of the inner wall of the noise reduction body 5, so that the fixing block and the inner wall of the noise reduction body can fit tightly.

[0053] In this embodiment, the extended line of the line from the center point of the cone lower cover 513 to the top of the cone noise reduction device 51 converges on the central axis of the noise reduction body 5 .

[0054] See also Fig.15 and Fig.16 In order to effectively consume and absorb the internal noise of the pile body, the present invention utilizes the following technical principles:

[0055] (1) Principle of sound wave reflection

[0056] When a sound wave is incident from one medium to another medium with different acoustic properties, reflection will occur at the interface between the two media, causing part of the sound wave's energy to return to the first medium. After multiple reflections, most of the sound wave's energy is converted into other forms, and the sound wave energy is gradually dissipated in the multiple reflection path, and the sound intensity gradually weakens;

[0057] (2) Passive noise reduction principle based on porous media materials

[0058] Porous medium material is a lightweight structure that can effectively absorb impact energy, reduce noise, increase heat dissipation and heat insulation. It is one of the most effective materials in sound absorption and noise reduction. Passive noise reduction uses sound insulation and sound absorption technology to control noise through acoustic packaging. Porous materials are the most widely used in acoustic packaging. The reasonable application of porous materials can effectively absorb noise in the transmission path; the mechanism of porous media absorbing noise is: there are a large number of holes and gaps inside the porous material, the holes and gaps are interconnected, and its surface is in contact with the outside world, such as Fig.15 As shown. When sound waves enter porous materials, there are two ways to attenuate the sound waves: First, because the sound waves excite the air in the small holes to vibrate, the air particles near the wall of the small holes and the center of the holes have different speeds, and friction will occur between the air particles and between the air particles and the hole walls. Due to the effects of friction and viscosity, part of the sound energy is converted into heat energy, thereby attenuating the sound waves. Second, heat exchange occurs between the air in the small holes and the hole walls, which also attenuates the sound energy. The principle of sound absorption and noise reduction of porous media materials is as follows: Fig.16 shown.

[0059] In addition, in order to effectively reduce the noise emitted from the charging pile body and prevent a large amount of dust from entering the fan and the pile body, the noise reduction principle of the present invention is as follows: Figure 1 As shown:

[0060] (1) A cylindrical noise reduction body 5 is installed outside the heat dissipation fan 2 to extend the path for the noise to be transmitted out of the pile body. At the same time, a noise reduction structure and a cone noise reduction device are arranged in the noise transmission path to consume and absorb the aerodynamic noise.

[0061] (2) Based on the passive noise reduction principle of porous medium materials, a fixed porous medium noise reduction material is installed in the noise reduction body so that when the noise is transmitted to this position, it can effectively reflect, consume and absorb the noise;

[0062] (3) Based on the reflection principle of sound waves, a cone-shaped noise reduction unit is set inside the pile body. A planar sound wave reflector is set on the surface of the cone noise reduction device 51. The main purpose of this design is to reflect the aerodynamic noise inside the pile body in multiple directions. Part of the reflected noise sound waves enter the noise absorption hole, thereby achieving noise consumption; at the same time, a certain distance is set between the noise reduction units and they are staggered, so as to achieve multiple reflection absorption of noise. After multiple reflections and consumption, the noise intensity gradually weakens;

[0063] (4) In order to reduce the noise generated by the mechanical vibration of the cooling fan when it is working, a vibration filtering structure is set around the fixed position of the cooling fan to reduce the noise generated by the mechanical vibration of the cooling fan when it is working;

[0064] (5) Based on the autonomous deformability of temperature-sensitive shape memory materials, a temperature-sensitive deformable bracket is set inside the cone noise reduction device. In areas with higher temperatures, the cone support bracket autonomously deforms so that the angle between the bracket and the wall of the noise reduction device decreases, reducing the blocking effect of the noise reduction cone on the discharge of hot air. In areas with relatively low temperatures, the cone support bracket autonomously deforms so that the angle between the bracket and the wall of the noise reduction device increases, mainly reflecting and consuming internal noise;

[0065] (6) Based on the principle of electrostatic dust removal, multiple layers of electrostatic dust screens are installed at the air outlet to prevent dust from the external environment from entering the fan and pile body.

[0066] In the present invention, the charging pile structure is arranged as follows: Figures 12-14 As shown. When the charging pile is working, the power module is the main contributor to the heat in the pile body. Using the principle of rising hot air flow, the power module is set on the upper part of the charging pile and directly faces the heat dissipation fan, so as to bring the heat generated by the power module when it is working out of the pile body. At the same time, the electronic devices are set at the bottom of the charging pile, and a heat insulation structure is set with the power module area to prevent the heat generated by the power module from damaging the electronic devices. In addition, in order to prevent the noise generated by the heat dissipation fan from being directly transmitted out of the pile body, a cone noise reduction device is set outside the heat dissipation fan to extend the noise transmission path. The noise generated by the system fan will be consumed and absorbed in the noise reduction area, which greatly reduces the noise intensity transmitted out of the pile body.

[0067] In the present invention, the electrostatic dustproof net 61 is mainly composed of a multi-layer filter screen, and its main function is to block external dust from entering the pile body. The main function of the anode device 63 and the cathode device 64 is to generate a high-voltage electrostatic field on the surface of the electrostatic dustproof net 61. When dust-laden air passes through, the dust combines with anions and carries negative charge, then moves to the anode of the net and gathers. When the dust gathers to a threshold value, it is removed to the outside of the pile body.

[0068] In the present invention, the structure of the cone noise reduction device 51 is a regular tetrahedron, and its main advantage is that it can receive and consume noise from multiple directions in space, and reflect noise to the external space. A bracket that changes with temperature is arranged inside the cone noise reduction device 51, and the surface of the cone is arranged as a flexible deformable material. Its advantage is that it can sense the internal temperature of the heat dissipation fan outlet area, and automatically deform with the temperature, so as to avoid the cone noise reduction unit's blocking effect on the discharge of hot air as much as possible. In addition, the cone noise reduction device is composed of an even number of devices, which are staggered. The purpose of this arrangement is to multiple consume and absorb noise. The distance between the cone noise reduction devices 51 gradually increases from the heat dissipation fan to the outside. The purpose of this arrangement is to focus on reflecting and consuming the position close to the noise source.

[0069] In the present invention, the movable frame 81 is slidably connected to the circular hole at the upper end of the support rod 83 through the spherical connecting block 81a, thereby realizing the 360° rotation function of the upper movable frame. The movable frame 81 is provided with three circular cap connectors 82 with an angle of 120°, and the surface of the structure is provided with a synaptic structure fixedly connected to the cone shell. The main functions of the support device are: (1) to provide fixed support for the surface of the cone shell; (2) to autonomously adjust the angle between the three circular cap connectors according to the external temperature, and push the upper movable frame to deflect, thereby realizing the deformation of the surface of the noise-reducing cone. This process senses the external temperature and autonomously deforms, reducing the blocking effect on the discharge of hot air flow, and has a high degree of automation.

[0070] In the present invention, the main purpose of providing a hemispherical cap 821 at the end of the circular cap connector 82 is that the shape is irregular and the surface is smooth, which can effectively reduce the impact on airflow obstruction; in addition, it can make the force in all directions uniform, and the uneven bearing of small external forces will cause damage to the structure. The main function of the temperature-sensitive shape memory spring 825 is that when the external temperature is higher than the threshold, its shape expands outward, and when the external temperature is lower and lower than the threshold, its shape shrinks inward. The contraction of the temperature-sensitive shape memory spring with temperature changes drives the deformation of the cone bracket, which in turn promotes the deformation of the cone surface. The ultimate goal is to reduce the blocking effect of the cone noise reduction unit on the discharge of internal hot airflow.

[0071] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A charging pile noise reduction device, comprising a connected charging pile body (1) and a heat dissipation fan (2), characterized in that: The outer side of the heat dissipation fan (2) is connected to a vibration filter box (3), a fan housing (4) matched with the heat dissipation fan (2) is provided in the vibration filter box (3), the heat dissipation fan (2) is nested in one side of the fan housing (4), and the other side of the fan housing (4) is connected to a noise reduction body (5), the noise reduction body (5) comprises a cone noise reduction device (51), a cone fixing block (52) and a noise reduction hole area (53), the cone noise reduction device (51) is connected to the inner wall of the noise reduction body (5) through the cone fixing block (52), and a noise reduction hole area (53) composed of a porous medium material is provided between two adjacent cone fixing blocks (52); A noise reflection sheet (511) and a noise reduction hole (512) are provided on each surface of the cone noise reduction device (51), and a cone lower cover (513) is provided at the bottom of the cone noise reduction device (51), and the cone lower cover (513) is fixedly connected to the cone fixing block (52) via the cone lower cover (513).

2. The charging pile noise reduction device according to claim 1, characterized in that: The center of the inner wall of the cone noise reduction device (51) is connected to a circular cap seat (7). The inner cavity of the cone noise reduction device (51) is provided with a supporting device (8) that cooperates with each other. The supporting device (8) comprises an upper movable frame (81), a circular cap connecting piece (82) and a lower supporting rod (83). The upper end of the movable frame (81) is connected to the top of the cone noise reduction device (51), and the lower end is provided with a spherical connecting block (81a). The spherical connecting block (81a) is slidably connected in the circular hole at the upper end of the supporting rod (83). The lower end of the supporting rod (83) is fixedly connected to the middle of the cone lower cover (513). One end of the three circular cap connecting pieces (82) is connected to the movable frame (81) through a sliding block (9), and the other end is connected to the circular cap seat (7) correspondingly, and the angle between two adjacent circular cap connecting pieces (82) is 120°.

3. The charging pile noise reduction device according to claim 2, characterized in that: The circular cap connecting member (82) comprises a hemispherical cap (821), an arc-shaped connecting member (822), a connecting rod (823), a fixing tube (824) and a shape memory spring (825). An arc-shaped groove (821a) is provided at the bottom of the hemispherical cap (821). The arc-shaped connecting member (822) is connected to the arc-shaped groove (821a) via a fixing bolt (10). The upper end of the connecting rod (823) is connected to the arc-shaped connecting member (822) via a small bolt (11). The fixing cylinder (824) is connected to the middle part of the fixing cylinder (822), the upper part of the fixing cylinder (824) is provided with an upper end cover (824a), and the lower part is provided with a lower end cover (824b), a shape memory spring (825) is connected between the upper end cover (824a) and the lower end cover (824b), the lower end of the connecting rod (823) is connected to the upper end cover (824a) of the fixing cylinder (824), and the lower end cover (824b) of the fixing cylinder (824) is fixedly connected to the sliding block (9).

4. The charging pile noise reduction device according to claim 3, characterized in that: The shape memory spring (825) is a temperature-sensitive shape memory spring.

5. The charging pile noise reduction device according to any one of claims 1 to 4, characterized in that: The cone fixing blocks (52) are evenly spaced on the inner wall of the noise reduction body (5), and the axis of the cone fixing block (52) is parallel to the axis of the noise reduction body (5). One side of the cone fixing block (52) is an arc-shaped surface, and its curvature is the same as the curvature of the inner wall of the noise reduction body (5).

6. The charging pile noise reduction device according to any one of claims 1 to 4, characterized in that: A group of fixing slots (54) matching with the cone fixing blocks (52) are provided on the inner wall of the noise reduction body (5), each cone fixing block (52) is fastened to the corresponding fixing slot (54), each cone fixing block (52) is connected to a regular tetrahedron cone noise reduction device (51), and the cone noise reduction device (51) is also arranged along the axis of the cone fixing block (52).

7. The charging pile noise reduction device according to any one of claims 1 to 4, characterized in that: The noise reflection sheet (511) is arranged in the middle of each surface of the cone noise reduction device (51), and the noise reduction holes (512) are distributed around the noise reflection sheet (511).

8. The charging pile noise reduction device according to any one of claims 1 to 4, characterized in that: The shock filtering box (3) comprises a shock filtering gasket made of shock filtering material.

9. The charging pile noise reduction device according to any one of claims 1 to 4, characterized in that: The end surface of the noise reduction body (5) is connected to a dustproof device (6), the dustproof device (6) comprises an electrostatic dustproof net (61) which matches the end surface of the noise reduction body (5), and a pair of arc plates (62) are connected inside the dustproof device (6), the arc plates (62) are arranged opposite to each other and have an anode device (63) and a cathode device (64) fixed thereon respectively.

10. The charging pile noise reduction device according to claim 9, characterized in that: The fan housing (4), the noise reduction body (5) and the dust prevention device (6) are all arranged in the middle of the shock filter box (3), and the axes thereof coincide with the axis of the shock filter box (3).

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