Charging device

Abstract

To enable appropriate reduction of noise that is generated at the time of charging regardless of the charging speed.SOLUTION: Inside a housing 12, a sound absorption structure 20 is installed in the vicinity of an external air intake hole 18H. The sound absorption structure 20 includes a panel member 22 and a sound absorption material 28. The panel member 22 comprises: a cell lattice part 24 formed in a lattice shape; and a plate-shaped part 26 that is provided at a position where it blocks an opening on one side of the cell lattice part 24, and that has a plurality of ventilation holes 26H formed therethrough. The panel member 22 is arranged so that the plate-shaped part 26 side on which the plurality of ventilation holes 26H are formed therethrough faces the side of the external air intake hole 18H. The sound absorption material 28 is in a sheet form and blocks an opening 24A on the other side of the cell lattice part 24.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a charging device. [Background technology]

[0002] The following Patent Document 1 discloses a technology relating to a device that acquires noise regulation information for the vehicle's location and controls charging of a secondary battery mounted on the vehicle so as to satisfy the acquired noise regulation information. According to this prior art, charging can be performed while complying with noise regulations. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-195204 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned prior art, the charging speed is limited in order to reduce the noise generated during charging.

[0005] In consideration of the above, an object of the present invention is to provide a charging device that can effectively reduce noise generated during charging regardless of the charging speed. [Means for solving the problem]

[0006] The charging device of the present invention described in claim 1 is a charging device for a vehicle, comprising a housing having an outside air intake hole, and a sound absorbing structure installed inside the housing near the outside air intake hole, wherein the sound absorbing structure comprises a cell lattice portion formed in a lattice pattern, and a plate-shaped portion provided at a position blocking one opening of the cell lattice portion and having a plurality of air holes formed therethrough, and also has a panel member arranged with the plate-shaped portion facing the outside air intake hole, and a sheet-shaped sound absorbing material blocking the other opening of the cell lattice portion.

[0007] According to the above configuration, when noise generated during charging inside the housing of the charging device passes through the sound absorbing material, a part of the noise is absorbed by the sound absorbing material. The noise that passes through the sound absorbing material passes through the space inside the panel member, a part of the noise is reflected by the plate-shaped portion and absorbed by the sound absorbing material, and another part passes through the plate-shaped portion and is transmitted to the outside of the housing through the outside air intake hole or its vicinity. Therefore, the noise passing through the outside air intake hole or the like from inside the housing is effectively reduced. In addition, since a plurality of ventilation holes are formed through the plate-shaped portion of the panel member, it is possible to ensure ventilation even if the sound absorbing structure is installed near the outside air intake hole. Effect of the Invention

[0008] As described above, the charging device of the present invention has the excellent effect of being able to effectively reduce noise generated during charging, regardless of the charging speed. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a charging device according to an embodiment of the present invention; [Diagram 2] 4 is a cross-sectional view showing a schematic view of a part of a plurality of outside air intake holes formed in a housing of the charging device and a part of a sound absorbing structure in the vicinity thereof. FIG. [Diagram 3] 4 is a diagram showing a part of a panel member as viewed from the inside of a housing of the charging device. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A charging device according to one embodiment of the present invention will be described with reference to Figures 1 to 3. In these figures, an arrow FR indicates the front side of the charging device, an arrow UP indicates the upper side of the charging device, and an arrow W indicates the width direction of the charging device.

[0011] Fig. 1 shows a perspective view of a charging device 10 according to this embodiment. The charging device 10 shown in Fig. 1 is a charging device for a vehicle (more specifically, for an electric vehicle) and has a function of charging a storage battery mounted on the vehicle. More specifically, the charging device 10 of this embodiment is a device called a quick charger that charges with DC power.

[0012] As shown in FIG. 1, the charging device 10 includes a housing 12. Although not shown, an input unit, a power conversion unit, an output unit, a low voltage unit, and a cooling unit are provided inside the housing 12. The power conversion unit is mounted in the central area of ​​the housing 12, for example, and is a component that converts AC power into DC power. Since the components inside the housing 12 are publicly known, detailed description thereof will be omitted. The charging device 10 includes a cable 14 for connecting to a storage battery of a vehicle. A connector 16 that is inserted into a charging port of the vehicle is attached to the tip side of the cable 14.

[0013] An outside air intake section 18 (illustrated as a vertically long rectangle in FIG. 1 for convenience) is provided in a side wall 12S of the housing 12 and configured with a large number (plurality of) outside air intake holes 18H (not shown in FIG. 1, see FIG. 2) for cooling the inside of the housing 12. The outside air intake holes 18H (see FIG. 2) penetrate the side wall 12S of the housing 12 and communicate between the inside and the outside of the housing 12.

[0014] 2 is a schematic cross-sectional view showing a part of a plurality of outside air intake holes 18H formed in the housing 12 of the charging device 10 and the vicinity thereof. In FIG. 2, the upper side of the figure with respect to the side wall 12S of the housing 12 is the inside of the housing 12, and the lower side of the figure with respect to the side wall 12S of the housing 12 is the outside of the housing 12.

[0015] As shown in Fig. 2, a sound absorbing structure 20 is installed inside the housing 12 near the outside air intake hole 18H. The sound absorbing structure 20 has a panel member 22 and a sound absorbing material 28. The panel member 22 is an element that can be understood as a one-sided rigid-wall cell lattice. Fig. 3 shows a state in which a part of the panel member 22 is viewed from the inside of the housing 12 of the charging device 10 (see Fig. 1 for both). As shown in Figs. 2 and 3, the panel member 22 includes a cell lattice portion 24 formed in a lattice shape, and a plate-like portion 26 having a plurality of air holes 26H formed therethrough and provided at a position that blocks an opening on one side (the lower side in Fig. 2) of the cell lattice portion 24.

[0016] In FIG. 2, which is a schematic cross-sectional view, in order to illustrate the structure in an easily understandable manner, the size of the ventilation holes 26H is shown larger than in FIG. 3, and the number of the ventilation holes 26H is shown reduced compared to FIG.

[0017] As shown in FIG. 3, the cell lattice portion 24 is formed in a rectangular (for example, a square) lattice shape, and the cell lattice portion 24 and the plate-shaped portion 26 form a plurality of cell spaces 27. The plurality of cell spaces 27 are formed to be regularly arranged. The vent holes 26H of the plate-shaped portion 26 are set to a size suitable for ensuring ventilation, and a plurality of vent holes 26H are set to face each of the plurality of cell spaces 27. As shown in FIG. 2, the panel member 22 is arranged so that the plate-shaped portion 26 side through which the plurality of vent holes 26H are formed faces the outside air intake hole 18H side. In the present embodiment, the panel member 22 is arranged, for example, with the plate-shaped portion 26 in contact with the side wall 12S of the housing 12.

[0018] From the viewpoint of breathability, it is preferable that the plurality of ventilation holes 26H are set so as to overlap the plurality of outside air intake holes 18H as much as possible. In the schematic cross-sectional view of Fig. 2, the diameter and position of the ventilation hole 26H are completely aligned with the diameter and position of the outside air intake hole 18H, but the diameters and positions of the outside air intake hole 18H and the ventilation hole 26H can be set appropriately in consideration of breathability. In Fig. 2, the ventilation direction passing through the outside air intake hole 18H and the ventilation hole 26H is indicated by an arrow VD.

[0019] The sound absorbing material 28 is formed in a sheet shape (thin) and closes the opening 24A on the other side of the cell lattice portion 24. A known material (made of a foam or a porous material, etc.) can be used for the sound absorbing material 28. From the viewpoint of air flow resistance, the sound absorbing material 28 is preferably one with high breathability. The sound absorbing material 28 can absorb sound by consuming the entering sound waves as thermal energy. In this embodiment, the position of the surface 28A of the sound absorbing material 28 on the opposite side to the panel member 22 side is set at a position where the particle velocity of the high-frequency magnetic sound (12 kHz band) is maximum (a position away from the inner surface of the plate-shaped portion 26 by 1 / 4 wavelength (7 mm, indicated by symbol X in the figure) of the high-frequency magnetic sound). The dashed line PV in FIG. 2 is a schematic representation of the particle velocity mode.

[0020] Next, the operation and effects of this embodiment will be described.

[0021] In this embodiment, when noise generated during charging inside the housing 12 of the charging device 10 passes through the sound-absorbing material 28, a portion of the noise is absorbed by the sound-absorbing material 28. The noise that passes through the sound-absorbing material passes through the cell space portion 27, a portion of the noise is reflected off the plate-shaped portion 26 and absorbed by the sound-absorbing material 28, and another portion passes through the plate-shaped portion 26 and is transmitted to the outside of the housing 12 from the outside air intake hole 18H or its vicinity. Therefore, noise passing from inside the housing 12 through the outside air intake hole 18H, etc. is effectively reduced.

[0022] To give a supplementary explanation, the charging device 10 generates a wide range of magnetic sounds, such as a 6 kHz band on the low frequency side and a 12 kHz band on the high frequency side, from the power supply system inside the housing 12. In contrast, in the charging device 10, for high-frequency magnetic sounds, the magnetic sounds attempt to pass through the sound-absorbing material 28 at the position where the particle speed of the sound waves reflected from the plate-shaped portion 26 is the highest, so that the sound-absorbing material 28 can efficiently absorb the magnetic sounds. In addition, in this charging device 10, the low-frequency magnetic sounds are reflected from the inner surface of the cell lattice portion 24 of the panel member 22, then reflected from the inner surface of the plate-shaped portion 26, and then reflected again from the inner surface of the cell lattice portion 24 (i.e., rectified inside the panel member 22), so that the sound-absorbing material 28 can effectively absorb the low-frequency magnetic sounds.

[0023] In this embodiment, a plurality of ventilation holes 26H are formed through the plate-like portion 26 of the panel member 22. Therefore, even if the sound absorbing structure 20 is installed near the outside air intake hole 18H, it is possible to ensure ventilation. That is, in this embodiment, even if the sound absorbing structure 20 is installed inside the housing 12 near the outside air intake hole 18H, ventilation resistance is suppressed, so that sound absorption can be ensured while suppressing a decrease in cooling performance.

[0024] As described above, according to the charging device 10 of the present embodiment, it is possible to effectively reduce the noise generated during charging, regardless of the charging speed.

[0025] Further, from another viewpoint, the external dimensions of the charging device are subject to transportation constraints, manufacturing constraints, etc., so it is difficult to secure space for providing sound absorbing materials or the like as noise countermeasures in the charging device. Here, as a noise countermeasure applied to conventional charging devices, for example, there is one in which a sound absorbing material with a thickness (14 mm) of 1 / 4 the wavelength of the magnetic sound on the low frequency side (6 kHz band) whose wavelength is longer than that of the magnetic sound on the high frequency side (12 kHz band) is provided. Compared to such a noise countermeasure, the sound absorbing structure 20 of this embodiment can be made thinner, so it can also contribute to space saving.

[0026] While one example of the present invention has been described above, the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0027] 10 Charging device 12. Chassis 18H Outside air intake hole 20 Sound absorbing structure 22 Panel material 24 Cell lattice section 26 Plate-shaped part 26H Ventilation hole 28 Sound absorbing material

Claims

[Claim 1] A charging device for a vehicle, A housing provided with an outside air intake hole; a sound absorbing structure disposed inside the housing near the outside air intake hole; Equipped with The sound absorbing structure is a panel member including a cell lattice portion formed in a lattice shape, and a plate-shaped portion provided at a position to cover one opening of the cell lattice portion and having a plurality of air holes formed therethrough, the panel member being arranged such that the plate-shaped portion side faces the outside air intake hole side; a sheet-like sound absorbing material that closes the opening on the other side of the cell lattice portion; A charging device having the same.

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