Electric working machine

Abstract

To provide an electric working machine in which an electric component is hardly adversely affected even if a liquid enters a battery housing case (battery mounting box).SOLUTION: According to one aspect of the present invention, a backpack electric working machine used with a battery attached thereto includes a working machine body having a housing case capable of housing the battery and a connection terminal electrically connected to the battery, and a backpack portion attached to the working machine body and used when an operator carries the working machine body on his / her back, wherein the housing case has a tubular body portion, a drain hole opened downward from the body portion, and an opening through which the battery can be introduced into the body portion, the connection terminal is disposed on an inner side of the body opposite to the opening, and the drain hole is provided between the connection terminal and the opening.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electric power tool. [Background technology]

[0002] A backpack-type sprayer has been proposed (see Patent Document 1). This sprayer includes a water tank, a water pump, a power supply, and a spray rod. The power supply is located below the water tank and includes a battery mounting box with a horizontal mounting opening, and a rotatable protective cover is placed over the mounting opening. Furthermore, a connection terminal for connecting to the battery is provided on the upper side of the battery mounting box.

[0003] In such a sprayer, if a user pours liquid into the water supply port formed on the top of the water tank and the liquid leaks onto the outer surface of the water tank, the liquid may run down the outer surface of the water tank and seep (flow) into the battery mounting box from the mating surface between the water tank and the battery mounting box. If liquid seeps into the battery mounting box, it may have an adverse effect on electrical components such as the battery and connection terminals. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Chinese Patent No. 111774201 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above circumstances, the present invention provides an electric working machine in which even if liquid seeps into the battery housing case (battery mounting box), it is difficult for the electrical components to be adversely affected. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided a backpack-type electric work machine that is used with a battery attached, comprising: a work machine main body having a storage case capable of storing the battery and connection terminals electrically connected to the battery; and a backpack part that is attached to the work machine main body and is used when the worker carries the work machine main body on his / her back; the storage case has a cylindrical body, a drainage hole that opens downward from the body, and an opening inside the body through which the battery can be introduced; the connection terminals are located on the inside of the body on the opposite side to the opening; and the drainage hole is provided between the connection terminal and the opening.

[0007] According to this aspect, liquid that has entered the storage case can be smoothly discharged, and is therefore less likely to adversely affect the electrical components. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing the configuration of a power sprayer, which is an example of an electric work machine. [Figure 2] FIG. 2 is a front view of the power sprayer shown in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 4] FIG. 2 is a perspective view showing the configuration of a battery storage section. [Figure 5] FIG. 4 is a side view showing the battery storage section with the lid open. [Figure 6] FIG. 2 is a perspective view showing the configuration of a battery housing case. [Figure 7] FIG. 7 is a bottom view of the battery housing case shown in FIG. 6. [Figure 8] FIG. 1 is a diagram for explaining how a liquid flows. [Figure 9] FIG. 1 is a diagram for explaining how a liquid flows. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of a power sprayer, which is an example of a backpack-type electric work machine used with a battery 100, will be described with reference to the accompanying drawings. The various features shown in the following embodiments can be combined with one another. FIG. 1 is a perspective view showing the configuration of a power sprayer, which is an example of an electric work machine. FIG. 2 is a front view of the power sprayer shown in FIG. 1. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 4 is a perspective view showing the configuration of the battery storage section. FIG. 5 is a side view showing the battery storage section with the lid open. FIG. 6 is a perspective view showing the configuration of the battery storage case. FIG. 7 is a bottom view of the battery storage case shown in FIG. 6. FIG. 8 is a diagram for explaining how liquid flows. FIG. 9 is a diagram for explaining how liquid flows.

[0010] The directions of the components constituting the power sprayer are defined based on the "up and down," "left and right," and "front and back" shown in the drawings. The power sprayer 1 shown in Figures 1 and 2 comprises a liquid storage section 2, a battery storage section 3, a spraying mechanism 4, a drive mechanism 5, a connection section 6, and a backpack section 7. In this embodiment, the liquid storage section 2, battery storage section 3, spraying mechanism 4, drive mechanism 5, and connection section 6 make up a work machine main body 10. The backpack section 7 is attached to the work machine main body 10. The backpack section 7 has a belt or the like and is used when the worker carries the work machine main body 10 (power sprayer 1) on his / her back.

[0011] The liquid storage section 2 has a tank 21 and a lid 22 . The tank 21 is a resin container for storing liquid, and is formed by, for example, blow molding. An inlet for injecting liquid into the tank 21 is formed at the upper end of the tank 21, and a resin lid 22 is detachably attached to the inlet. In addition, a drain outlet (not shown) is provided at the bottom of the tank 21 for supplying liquid to the electric pump 51 described later, and one end of a water supply hose 45 is connected to the discharge outlet 511 of the electric pump 51.

[0012] The battery storage section 3 has a storage section main body 31 and a lid 32 . The container body 31 is a box made of resin and is formed by, for example, injection molding. As shown in Figures 3 and 4, a drive mechanism 5 is mounted on the container body 31 on the side of the liquid container 2. The storage section main body 31 (work machine main body 10) has a recess 311 and a lid 32 that can close the recess 311. The lid 32 has a lid main body 321 and a support part 322 that supports the lid main body 321 so that it can rotate relative to the storage section main body 31 (work machine main body 10). A storage case 33 that can house the battery 100 is arranged within this recess 311.

[0013] 6 and 7, the storage case 33 has a cylindrical body 331, a drain hole 335 that opens downward from the body 331, and an opening 333 inside the body through which the battery 100 can be introduced. The entire storage case 33 is disposed within the recess 311 of the storage unit main body 31. Furthermore, a metal connection terminal 334 electrically connected to the battery 100 is disposed on the inside of the body 331 on the side opposite the opening 333, and a drain hole 335 is provided between the connection terminal 334 and the opening 333. When the battery 100 is housed in the housing case 33 and the connection terminal of the battery 100 is connected to the connection terminal 334, power is supplied from the battery 100 to the control board and the drive mechanism 5 (an electric pump 51, described later). In this manner, the work machine body 10 has the storage case 33 and the connection terminal 334 .

[0014] Here, for example, when a user injects liquid into the inlet of tank 21, if the liquid leaks onto the outer surface of tank 21, the liquid may run down the outer surface of tank 21, particularly near support part 322, and penetrate (flow) into recess 311 of storage body 31, and further penetrate (flow) into storage case 33 placed within this recess 311. Similarly, if the power sprayer 1 is left outdoors, rainwater (liquid) may seep into the storage case 33.

[0015] In this embodiment, drainage hole 335 is provided between connection terminal 334 and opening 333 of housing case 33, so that liquid that has seeped into housing case 33 can be drained out of housing case 33 via drainage hole 335 before it reaches connection terminal 334. This makes it possible to effectively prevent or suppress adverse effects such as short circuiting and corrosion on connection terminal 334. This also makes it possible to omit a sealing member from housing body 31 or to reduce the level of sealing, thereby reducing the number of parts and manufacturing costs of power sprayer 1. Furthermore, casing 33 further has a guide passage that guides liquid to drain hole 335. By providing such a guide passage, liquid that has seeped into casing 33 can be efficiently guided to drain hole 335. In this embodiment, the guide passage is provided along the inner surface on the lower side of body 331 and is configured as groove 336 that communicates with drain hole 335. Groove 336 allows the guide passage to be formed without complicating the configuration of casing 33.

[0016] Battery 100 is a known battery, and as shown in FIG. 5, is configured by housing a secondary battery such as a lithium ion secondary battery in a rectangular parallelepiped case extending in the front-rear direction. A slide groove 101 extending in the front-rear direction is recessed and formed on each of the left and right surfaces of the battery 100. Meanwhile, the accommodating case 33 further has a pair of slide rails 337 provided along the front-rear direction on the left and right inner surfaces thereof. By inserting the slide rails 337 into the slide grooves 101 of the battery 100 and moving them, the battery 100 can be slid into the accommodating case 33. The groove (guide passage) 336 is located below the slide rails 337. With this configuration, the dead space of the accommodating case 33 can be effectively utilized.

[0017] When the battery 100 is housed in the housing case 33, it protrudes from the opening 333 of the body 331. The battery 100 case has a housing section 102, which houses an LED lamp and a control circuit inside the case, on the opposing surface (longitudinal rear end) of the housing that faces the direction in which the battery 100 is removed from the housing case 33. Furthermore, the housing section 102 has protrusions that protrude a predetermined amount toward the removal side beyond the upper edge and left and right edges of the opposing surface when the battery 100 is housed in the housing case 33. With this configuration, liquid that has entered the recess 311 of the housing body 31 flows from above to below along the upper edge and left and right edges of the housing section 102, as shown in FIGS. 8( a) and 8(b), and then flows toward the groove 336, as shown in FIG. 9. In other words, the battery 100 can be said to have a guide shape on its outer surface that guides liquid to the groove (guide passage) 336. The liquid that has flowed into groove 336 is then discharged to the outside of casing 33 through drain hole 335. This effectively prevents or suppresses the occurrence of adverse effects of the liquid on connection terminal 334.

[0018] 8(a), the battery 100 is provided with an ejection mechanism 103 for removing the battery 100 from the storage case 33. The ejection mechanism 103 has an engagement part 1031 that is provided so as to be able to protrude and retract from the battery 100, and a lever 1032 that operates to retract the engagement part 1031 into the battery 100. An engagement hole 338 into which the engagement part 1031 is inserted is formed through the bottom surface of the storage case 33 near the opening 333. When the battery 100 is stored in the storage case 33, the engagement part 1031 engages with the engagement hole 338, thereby preventing the battery 100 from being removed from the storage case 33 and, in turn, from the storage unit main body 31. On the other hand, the battery 100 can be removed from the storage case 33 (storage unit main body 31) by operating the lever 1032 to release the engagement of the engagement part 1031 with the engagement hole 338.

[0019] When placed on a horizontal surface (such as the ground), the housing case 33 is arranged so that it slopes downward from the opening 333 toward the opposite side of the opening 333 (the connection terminal 334 side). In this case, the groove (guide flow path) 336 slopes toward the drainage hole 335. Therefore, even if liquid seeps into the housing case 33 when the power sprayer 1 is left on the ground outdoors, the liquid can be smoothly drained through the drainage hole 335. Furthermore, when the lid 32 is opened to remove the battery 100 from the housing case 33, liquid such as rainwater adhering to the lid 32 flows into the opening 333 and can flow from the upper edge and left and right edge into the groove (guide flow path) 336, allowing the liquid to be smoothly drained through the drainage hole 335.

[0020] In this embodiment, the storage case 33 is arranged with the connection terminals 334 on the backpack section 7 side. With this configuration, when the operator carries the power sprayer 1 on his back, the inclination angle of the storage case 33 is greater than when it is placed on a horizontal surface (the ground, etc.). Therefore, even if liquid such as rainwater seeps into the battery storage section 3 (storage case 33) when the power sprayer 1 is carried on the operator's back, it can be smoothly drained out through the drain hole 335. Furthermore, when the operator carries the power sprayer 1 on his back, liquid remaining in the groove (guide flow path) 336 can be more smoothly drained into the drain hole 335.

[0021] A water supply port 312 is provided at the top of the container body 31. The water supply port 312 is connected to the drain outlet of the tank 21, and is equipped with a filter 23 as shown in FIG. An electric pump 51 serving as the drive mechanism 5 is disposed on the upper part of the container body 31. The electric pump 51 draws in the liquid contained (stored) in the tank 21 through the drain outlet and the water supply port 312 of the tank 21 and supplies the liquid to the spray mechanism 4.

[0022] 2, the spray mechanism 4 has a nozzle pipe 41, a handle 42 to which the nozzle pipe 41 is connected, and a water supply hose 45 that connects the handle 42 to an outlet 511 of an electric pump 51. By operating a lever 43 provided on the handle 42, a user can spray liquid from a spray part 44 provided at the tip of the nozzle pipe 41. The connection part 6 is formed by bending a metal or resin pipe 61, and connects the liquid storage part 2 and the battery storage part 3. A backpack part 7 is fixed to predetermined locations of the liquid storage part 2, the battery storage part 3, and the connection part 6 using a bottle or the like.

[0023] The electric work machine can be applied to a power sprayer that sprays liquid using an electric pump 51 as described above, but can also be applied to, for example, a mist blower that supplies liquid in the form of a mist using a fan, or a mist blower that omits the liquid storage section. Furthermore, it may be provided in the following aspects.

[0024] (1) A backpack-type electric work machine that is used with a battery attached, comprising: a work machine body having a storage case capable of storing the battery and a connection terminal electrically connected to the battery; and a backpack part that is attached to the work machine body and is used when the worker carries the work machine body on his back; the storage case has a cylindrical body, a drainage hole that opens downward from the body, and an opening inside the body through which the battery can be introduced; the connection terminal is located on the inside of the body on the opposite side to the opening; and the drainage hole is provided between the connection terminal and the opening.

[0025] (2) The electric operating machine described in (1) above, wherein the battery protrudes from the opening of the body portion when housed in the housing case.

[0026] (3) In the electric operating machine described in (1) or (2) above, the storage case further has a guide passage that guides liquid to the drain hole.

[0027] (4) In the electric working machine described in (3) above, the guide passage is a groove provided along the inner surface of the lower side of the body portion and communicating with the drainage hole.

[0028] (5) In the electric operating machine described in (3) or (4) above, the battery has a guide shape on its outer surface that guides the liquid to the guide passage.

[0029] (6) An electric working machine according to any one of (3) to (5) above, wherein the storage case further has a slide rail for storing the battery by sliding, and the guide passage is located below the slide rail.

[0030] (7) The electric operating machine according to any one of (1) to (6) above, wherein the storage case is arranged so as to incline downward from the opening toward the opposite side of the opening.

[0031] (8) The electric operating machine according to any one of (1) to (7) above, wherein the storage case is arranged with the connection terminals on the backpack side.

[0032] (9) An electric working machine as described in any one of (1) to (8) above, wherein the working machine body has a recess in which the storage case is placed and a lid capable of closing the recess, and the lid has a lid body and a support part that supports the lid body rotatably relative to the working machine body.

[0033] (10) The electric working machine according to any one of (1) to (9) above, wherein the electric working machine is a power sprayer, a mist blower, or a blower. Of course, this is not the case.

[0034] Finally, while various embodiments of the present invention have been described, these are presented by way of example only and are not intended to limit the scope of the invention. The novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. Such embodiments and modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the inventions and their equivalents as defined in the accompanying claims. [Explanation of symbols]

[0035] 1:Power sprayer 2: Liquid storage section 21: Tank 22: Lid 23: Filter 3: Battery compartment 31: Storage unit body 311: Recess 312: Water supply port 32: Lid 321: Lid body 322: Support part 33: Storage case 331: Torso 333 :Aperture 334: Connection terminal 335: Drain hole 336: Groove 337: Slide rail 338: Engagement hole 4: Spraying mechanism 41: Nozzle pipe 42: Grip part 43: Lever 44: Spout part 45: Water supply hose 5: Drive mechanism 51: Electric pump 511:Discharge port 6: Connection part 61: Pipe 7:Back part 10: Work machine body 100: Battery 101: Slide groove 102: Storage unit 103: Ejection mechanism 1031: Engagement part 1032: Lever

Claims

1. A backpack-type electric work machine that is used with a battery attached, a working machine body having a housing case capable of housing the battery and a connection terminal electrically connected to the battery; a backpack part attached to the work machine body and used by a worker when carrying the work machine body on his / her back, the storage case has a cylindrical body, a drain hole that opens downward from the body, and an opening inside the body through which the battery can be introduced; the connection terminal is disposed inside the body portion on the opposite side to the opening, The drain hole is provided between the connection terminal and the opening.

2. The electric operating machine according to claim 1, The battery protrudes from the opening of the body portion when housed in the housing case.

3. The electric operating machine according to claim 1, The electric operating machine, wherein the storage case further has a guide passage that guides liquid to the drain hole.

4. The electric operating machine according to claim 3, The guide passage is a groove provided along the inner surface of the lower side of the body and communicating with the drainage hole.

5. The electric operating machine according to claim 3, The battery has a guide shape on its outer surface that guides the liquid into the guide passage.

6. The electric operating machine according to claim 3, The storage case further includes a slide rail for slidingly storing the battery, The guide passage is located below the slide rail.

7. The electric operating machine according to claim 1, The electric operating machine, wherein the storage case is arranged so as to incline downward from the opening toward the opposite side to the opening.

8. The electric operating machine according to claim 1, The electric operating machine is configured such that the connection terminals of the storage case are positioned on the backpack side.

9. The electric operating machine according to claim 1, The work machine body has a recess in which the storage case is disposed and a lid capable of closing the recess, The lid comprises a lid body and a support portion that supports the lid body rotatably relative to the work machine body.

10. The electric operating machine according to claim 1, The electric working machine is a power sprayer, a mist blower or a blower.

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