JP2016149841A - Charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-large-sized charger capable of draining water penetrating inside.SOLUTION: A charger 1, provided for charging a battery pack 5 detachably mounted on a cordless electric tool, includes a fan 14 to cool the battery pack 5 and a substrate 4, inside an upper case 2 and a lower case 3. Water penetrating from a battery pack air intake 7 of the upper case 2 is drained from an air outlet 10 to the outside through a water channel 15. The water channel 15 is positioned downward of an air channel for passing air which is inhaled from the battery pack air intake 7 to the inside of the upper case 2 and the lower case 3 by the rotation of the fan 14.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a charging device that charges a battery pack that is detachably attached to, for example, a cordless electric tool.

  The cordless electric tool is detachably mounted with a battery pack for supplying electric power to a motor as a driving source. The battery pack includes a secondary battery cell such as a rechargeable lithium battery. A charging device is used to charge the battery pack. The charging device includes a fan for cooling the battery pack being charged. The wind window of the battery pack attached to the charging device and the intake port of the charging device communicate with each other, and the air flow generated by the fan is sucked into the charging device through the inside of the battery pack and exhausted from the exhaust port of the charging device. Is done.

  In recent years, with the expansion of the capacity of battery packs, charging has been accelerated by charging devices. For this reason, it has become necessary to cool the substrate of the charging device, which conventionally did not require cooling, in order to prevent heat generation of the electronic components. Therefore, if the fan for cooling the battery pack is used to cool the board, the fan and the board cannot be completely separated from each other. Therefore, the charging device passes through the wind window of the battery pack and the inlet of the charging device. The problem is the treatment of water entering the interior.

JP2015-019535A

  As one method of discharging the water entering the charging device, it is conceivable to provide a dedicated drain hole as in the charging device described in Patent Document 1. However, in order to provide a dedicated water drain hole, a certain area or more is required in the charging device, so there is a problem that the area of the substrate must be reduced or the size of the charging device must be increased.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a charging device capable of discharging water entering the inside without increasing the size.

One embodiment of the present invention is a charging device. This charging device
A case having an installation part on the lower surface, a battery pack mounting part and an air inlet;
A fan provided in the case;
A water channel through which water infiltrated into the case from the intake port passes,
An air path through which air sucked into the case from the intake port by rotation of the fan passes,
The water channel is located below the air channel.

  The water channel may be located below the fan.

  You may have an exhaust port from which the said air is exhausted and the said water is discharged | emitted.

An air guide member that forms an air path from the air inlet to the fan in the case;
Water that has entered from the air inlet may be caused to flow toward the fan by the air guide member.

The fan is provided in the vicinity of an exhaust port for exhausting the air to the outside of the case,
The air intake port may open to the battery pack mounting portion, and water that has entered from the air intake port may flow to the fan side by the air guide member and be discharged to the outside from the exhaust port.

The inlet has a first inlet and a second inlet;
A board provided in an air path between the first air inlet and the fan in the case;
The air guide member that forms an air path from the second air inlet to the fan in the case, and
Even if the second air inlet opens to the battery pack mounting portion and the water that has entered from the second air inlet flows to the fan side by the air guide member and is discharged to the outside from the air outlet. Good.

  The case may include a waterproof wall portion that prevents water from flowing from the section in which the exhaust port is opened to the substrate side.

  The downstream end portion of the air guide member in the direction in which the water flows may be located closer to the exhaust port than the waterproof wall portion.

  The fan may be disposed in a partition between the waterproof wall and the exhaust port.

  A water channel that guides water that has fallen from the air guide member toward the exhaust port may be provided in a partition between the waterproof wall and the exhaust port.

  The air guide member may have an inclined portion that descends toward the fan side.

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the charging device which can discharge | emit the water which penetrates inside without enlarging can be provided.

The top view of the charging device 1 which concerns on embodiment of this invention. The front view of the charging device 1. FIG. The top view of the battery pack 5 shown in FIG.1 and FIG.2. The front view. The bottom view of the upper case 2 of the charging device 1. FIG. The top view of the air duct 13 fixed to the upper case 2. FIG. DD sectional drawing of FIG. The top view of the lower case 3 of the charging device 1. FIG. The left view of the lower case 3. FIG. FIG. 3 is a cross-sectional view taken along the line B-B in FIG. 2, illustrating the flow of airflow sucked from the battery pack intake port 7 in the charging device 1. It is CC sectional drawing of FIG. 2, Comprising: Explanatory drawing which shows the flow of the airflow inhaled from the board | substrate inlet port 8 in the charging device 1. FIG. It is AA sectional drawing of FIG. 1, Comprising: Explanatory drawing which shows the airflow in the state which mounted | wore the battery pack 5 in the charging device 1, and the flow of water. It is AA sectional drawing of FIG. 1, Comprising: Explanatory drawing which shows the flow of the water in the state which has not mounted | wore with the battery pack 5 in the charging device 1. FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  FIG. 1 is a plan view of a charging device (charger) 1 according to an embodiment of the present invention. In FIG. 1, the battery pack 5 is shown in the preparation position before being slid. Further, since the battery pack 5 is slid and mounted on the charging device 1 by turning upside down, the bottom surface of the battery pack 5 appears in FIG. FIG. 2 is a front view of the charging device 1. FIG. 3 is a plan view of the battery pack 5. FIG. 4 is a front view of the same. FIG. 5 is a bottom view of the upper case 2 of the charging device 1. FIG. 6 is a plan view of the air duct 13 fixed to the upper case 2. 7 is a cross-sectional view taken along the line DD of FIG. FIG. 8 is a plan view of the lower case 3 of the charging device 1. FIG. 9 is a left side view of the lower case 3. FIG. 10 is a cross-sectional view taken along the line B-B in FIG. 2, and is an explanatory diagram showing the flow of the airflow sucked from the battery pack inlet 7 in the charging device 1. FIG. 11 is a cross-sectional view taken along the line C-C of FIG. 2, and is an explanatory diagram showing the flow of airflow sucked from the board intake port 8 in the charging device 1. FIG. 12 is a cross-sectional view taken along the line AA in FIG. 1, and is an explanatory diagram showing the airflow and the water flow in the charging device 1 with the battery pack 5 attached. FIG. 13 is a cross-sectional view taken along the line AA of FIG. 1, and is an explanatory diagram showing the flow of water in the charging device 1 in a state where the battery pack 5 is not attached.

  As shown in FIG. 1, the charging device 1 includes a case in which an upper case 2 and a lower case 3 are combined. The upper case 2 and the lower case 3 are, for example, resin molded bodies. The upper case 2 has a battery pack mounting portion 2a on the upper surface for mounting (sliding mounting) the battery pack 5 in a detachable manner. The charging device 1 is connected to an external power source such as a commercial power source by a power cord 19 and charges the battery pack 5 mounted on the battery pack mounting portion 2a with the power supplied from the external power source. In addition, since the structure regarding charging may be the same as the conventional one, description thereof is omitted here.

  As shown in FIG. 1, the upper case 2 has a predetermined number of battery pack air inlets 7 as second air inlets that open to the battery pack mounting portion 2 a. The battery pack inlet 7 is located above the arrangement area of the lower case 3 of the substrate 4. As shown in FIG. 12, the battery pack inlet 7 communicates with a predetermined number of exhaust ports 12 (FIG. 3) of the battery pack 5 attached to the battery pack attachment portion 2a. As shown in FIGS. 2 and 4, the battery pack 5 has a predetermined number of air inlets 11 on the front surface. As shown in FIGS. 1, 5, and 10, the upper case 2 has a predetermined number of exhaust ports 9. As shown in FIGS. 8 and 11, the lower case 3 has a predetermined number of exhaust ports 10. The exhaust ports 9 and 10 are preferably provided in the vicinity of the corner closest to the battery pack intake port 7. With this arrangement, the air duct 14 to be described later can be made small, and the air duct 14 is prevented from becoming an obstacle when the electronic component 4a is mounted on the substrate 4 to be described later.

  As shown in FIGS. 8, 9 and 11, the lower case 3 has a predetermined number of board intake ports 8 as first intake ports. As shown in FIGS. 10 and 11, a fan (cooling fan) 14 for cooling the substrate 4 and the battery pack 5 is provided in the vicinity of the exhaust ports 9 and 10 inside the upper case 2 and the lower case 3. It is done. Here, the fan 14 is an axial fan that generates an airflow toward the exhaust ports 9 and 10. Note that there is one fan 14, FIG. 10 shows a state where the fan 14 is attached to the upper case 2, and FIG. 11 shows a state where the fan 14 is attached to the lower case 3. As shown in FIGS. 11 to 13, in the air path between the board inlet 8 and the fan 14 inside the upper case 2 and the lower case 3, electronic components such as a coil and a transformer related to the charging function are provided. A substrate (main substrate) 4 on which 4a is mounted is provided. As shown in FIGS. 10, 12, and 13, the upper case 2 includes an air guide member that forms an air path from the battery pack inlet 7 to the fan 14 in the upper case 2 and the lower case 3. An air duct 13 is provided. The air duct 13 is a resin molded body, for example, and is fixed to the upper surface of the upper case 2 by screws 18. As shown in FIGS. 6 and 7, the air duct 13 has, for example, a U-shaped cross section, and preferably has an inclined surface (inclined portion) 13 a that descends toward the fan 14 side.

  As shown in FIGS. 8 and 11 to 13, the lower case 3 has waterproof wall portions (partition wall portions) 16 and 17. The waterproof wall portion 16 is a rib that rises from the bottom surface of the lower case 3, and prevents the water from flowing from the section where the exhaust port 10 is opened to the substrate 4 side, separating the exhaust port 10 and the substrate 4. A fan 14 is disposed in a partition between the waterproof wall 16 and the exhaust port 10. Further, the downstream end portion of the air duct 13 in the direction in which water (air) flows is located closer to the exhaust port 10 than the waterproof wall portion 16. That is, the partition between the waterproof wall portion 16 and the exhaust port 10 is also a water receiving portion that receives water falling from the air duct 13, where water is efficiently directed toward the exhaust port 10 as shown in FIG. A water channel 15 is formed by the rib 15a. The height of the rib 15 a is lower than the waterproof wall portion 16. The waterproof wall portion 17 is a rib that rises from the bottom surface of the lower case 3, and prevents water that has entered the substrate intake port 8 from flowing into the substrate 4 side from the substrate intake port 8 and the substrate 4. .

  Hereinafter, the airflow generated by the fan 14 and the flow of water entering from the battery pack inlet 7 will be described. As shown in FIGS. 11 and 12, the airflow (substrate cooling air) for cooling the substrate 4 is sucked from the substrate intake port 8 of the lower case 3 to cool the substrate 4 and the electronic component 4a mounted thereon, The air is sucked into the fan 14 and exhausted from the exhaust ports 9 and 10. On the other hand, as shown in FIGS. 10 and 12, the airflow for cooling the battery pack 5 (battery pack cooling air) is sucked from the air inlet 11 of the battery pack 5, and the battery cells 6 in the battery pack 5 and the unillustrated The board is cooled and sucked into the upper case 2 and the lower case 3 through the exhaust port 12 of the battery pack 5 and the battery pack intake port 7 of the upper case 2, led to the air duct 13 and sucked into the fan 14. Then, the air is exhausted from the exhaust ports 9 and 10. As shown in FIGS. 12 and 13, the water that has entered from the battery pack air inlet 7 of the upper case 2 is guided by the air duct 13 and falls into a partition between the waterproof wall 16 and the air outlet 10. It flows to the exhaust port 10 side along the water channel 15 and is discharged from the exhaust port 10. Water intrusion can occur both when the battery pack 5 is attached (FIG. 12) and when it is not attached (FIG. 13). In either case, water flows to the fan 14 side by the air duct 13, The gas is discharged from the exhaust port 10 to the outside. The exhaust port 10 functions as a water drain port (discharge port). The water channel 15 is formed below the fan 14, and water is discharged from the exhaust port 10 (discharge port) to the outside through the water channel 15. That is, when the charging device 1 is viewed from above (FIG. 8 and the like), the cooling air channel and the water channel overlap (at least a part is formed at the same position when viewed in the vertical direction). In the vertical direction of the device 1 (when viewed from the side), the water channel is located below the cooling air channel. The fan 14 is located in the cooling air passage and above the water passage.

  According to the present embodiment, the following effects can be achieved.

(1) The charging device 1 is configured such that water that has entered through the battery pack intake port 7 flows to the fan 14 side by the air duct 13 and is discharged to the outside through the exhaust port 10. It can be discharged regardless of the dedicated drain hole. Therefore, it is not necessary to reduce the area of the board or increase the size of the charging device 1 in order to provide a dedicated drain hole.

(2) Since the lower case 3 separates the partition where the water falls from the air duct 13 from the substrate 4 by the waterproof wall portion 16, the water dropped from the air duct 13 can be prevented from flowing to the substrate 4 side.

(3) Since the downstream end portion of the air duct 13 is located closer to the exhaust port 10 than the waterproof wall portion 16, water that has dropped from the air duct 13 can be prevented from flowing to the substrate 4.

(4) Since the lower case 3 has the water channel 15 in a section where water falls from the air duct 13, the water dropped from the air duct 13 can be efficiently guided to the exhaust port 10.

(5) Since the air duct 13 has the inclined surface 13a that goes down toward the fan 14, the water that has entered from the battery pack inlet 7 can be efficiently flowed to the fan 14 side through the inclined surface 13a.

(6) Since the airflow generated by one fan 14 is divided into the substrate cooling air and the battery pack cooling air by the air duct 13, the number of parts is reduced compared to the configuration in which the substrate 4 and the battery pack 5 are cooled by separate fans. It can be reduced and is also advantageous for space saving.

(7) When the fan 14 is driven, the air flow generated by the fan 14 acts to flow the water that has entered from the battery pack intake port 7 toward the exhaust port 10, thereby promoting drainage.

(8) Since the exhaust ports 9 and 10 are provided in the vicinity of the corner closest to the battery pack intake port 7, the air duct 14 can be made small, and the air duct 14 becomes an obstacle when the electronic component 4a is mounted on the board 4. Never become.

(9) Since the water channel is located below the cooling air channel in the vertical direction of the charging device 1, it is possible to suppress an increase in the size of the charging device 1.

(10) Since water is discharged from the exhaust port 10 through the water channel 15 formed below the fan 14, it is possible to prevent water from being applied to the fan 14 and to suppress the failure of the fan 14 due to water. Can do.

  The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, modifications will be described.

  The battery pack charged by the charging device 1 may be detachably attached to an electric device other than the electric tool.

DESCRIPTION OF SYMBOLS 1 Charger (charger), 2 Upper case (upper outer frame), 2a Battery pack mounting part, 3 Lower case (lower outer frame), 4 Substrate (main substrate), 5 Battery pack, 7 Air intake for battery pack ( 2nd intake port), 8 substrate intake port (first intake port), 9,10 exhaust port, 11 intake port (wind window), 12 exhaust port (wind window), 13 air duct (wind guide member), 13a Surface (inclined part), 14 fan (cooling fan), 15 water channel, 15a rib, 16, 17 waterproof wall part (partition wall part), 18 screw (fixing member), 19 power cord

Claims (11)

A case having an installation part on the lower surface, a battery pack mounting part and an air inlet;
A fan provided in the case;
A water channel through which water infiltrated into the case from the intake port passes,
An air path through which air sucked into the case from the intake port by rotation of the fan passes,
The said water channel is a charging device located under the said air channel.   The charging device according to claim 1, wherein the water channel is located below the fan.   The charging device according to claim 1, further comprising an exhaust port through which the air is exhausted and the water is exhausted. An air guide member that forms an air path from the air inlet to the fan in the case;
The charging device according to any one of claims 1 to 3, wherein water that has entered from the air intake port is caused to flow to the fan side by the air guide member. The fan is provided in the vicinity of an exhaust port for exhausting the air to the outside of the case,
The charging according to claim 4, wherein the intake port opens to the battery pack mounting portion, and water that has entered from the intake port flows to the fan side by the air guide member and is discharged to the outside from the exhaust port. apparatus. The inlet has a first inlet and a second inlet;
A board provided in an air path between the first air inlet and the fan in the case;
The air guide member that forms an air path from the second air inlet to the fan in the case, and
The second air inlet opens to the battery pack mounting portion, and water that has entered from the second air inlet flows to the fan side by the air guide member and is discharged to the outside from the exhaust port. Item 6. The charging device according to Item 5.   The charging device according to claim 6, wherein the case has a waterproof wall portion that prevents water from flowing from the section in which the exhaust port is opened to the substrate side.   The charging device according to claim 7, wherein a downstream end portion of the air guide member in a direction in which the water flows is located closer to the exhaust port than the waterproof wall portion.   The charging device according to claim 7 or 8, wherein the fan is disposed in a partition between the waterproof wall portion and the exhaust port.   10. The water channel according to claim 7, wherein a water channel that guides water falling from the air guide member toward the exhaust port is provided in a partition between the waterproof wall portion and the exhaust port. The charging device described.   The charging device according to any one of claims 4 to 10, wherein the air guide member has an inclined portion that descends toward the fan side.

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