Electric pump

Abstract

The invention provides an electric pump. The electric pump includes: a motor unit; and a pump unit driven by the motor unit and capable of discharging water. The motor unit includes: a main body case including a battery holding portion capable of holding a battery pack; and an electric motor housed in the main body case and driving the pump unit. The battery pack can be used in electric pumps and devices other than electric pumps.

Description

Technical Field

[0001] The technology disclosed in this specification relates to an electric pump. Background Art

[0002] An electric pump is disclosed in the specification of Chinese Patent Application Publication No. 115875301. The electric pump includes: a motor unit; and a pump unit, which is driven by the motor unit and can spray water. The motor unit includes: a main body housing, which includes a battery holding portion that can hold a battery pack; and an electric motor, which is housed in the main body housing and drives the pump unit. Summary of the invention

[0003] Problem that the invention aims to solve

[0004] A dedicated battery pack is used in the above-mentioned electric pump. Therefore, it is desired to make the electric pump easy to use. In this specification, a technology that enables the electric pump to be easy to use is provided.

[0005] Solutions for solving problems

[0006] This specification discloses an electric pump. The electric pump includes: a motor unit; and a pump unit that is driven by the motor unit and can spray water. The motor unit includes: a main body housing that includes a battery holding portion that can hold a battery pack; and an electric motor that is accommodated in the main body housing and drives the pump unit. The battery pack can be used in the electric pump and other equipment than the electric pump.

[0007] According to the above configuration, a highly versatile battery pack is used in the electric pump, thereby making it possible to easily use the electric pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a perspective view of the electric pump 2 according to the first embodiment.

[0009] Figure 2 It is a perspective view of the reinforcing bar binding machine 3 according to the first embodiment.

[0010] Figure 3 It is a perspective view of the motor unit 4 and the battery pack BP according to the first embodiment.

[0011] Figure 4 It is a perspective view of the motor unit 4 and the battery pack BP according to the first embodiment.

[0012] Figure 5 It is a right side sectional view of the electric pump 2 according to the first embodiment.

[0013] Figure 6 It is a perspective view of the motor unit 4 according to the first embodiment.

[0014] Figure 7It is a right side cross-sectional view of the motor unit 4 and the battery pack BP according to the first embodiment.

[0015] Figure 8 It is a rear cross-sectional view of the motor unit 4 according to the first embodiment.

[0016] Fig. 9 It is a right sectional view of the vicinity of the output unit 86 in the motor unit 4 of the first embodiment.

[0017] Fig.10 It is a rear view of the electric pump 2 according to the first embodiment.

[0018] Fig.11 It is a right sectional view of the vicinity of the pump unit 6 in the electric pump 2 according to the first embodiment.

[0019] Fig.12 It is a right side view of the electric pump 2 according to the second embodiment.

[0020] Fig.13 It is a right side view of the electric pump 2 according to the third embodiment.

[0021] Fig.14 It is a right side view of the electric pump 2 according to the fourth embodiment.

[0022] Fig.15 It is a right side view of the electric pump 2 according to the fifth embodiment.

[0023] Fig.16 It is a right side view of the electric pump 2 according to the sixth embodiment.

[0024] Fig.17 It is a top view of the electric pump 2 according to the seventh embodiment.

[0025] Fig.18 It is a top view of the electric pump 2 according to the eighth embodiment.

[0026] Fig.19 It is a top view of the electric pump 2 according to the ninth embodiment.

[0027] Fig. 20 It is a right side view of the electric pump 2 according to the tenth embodiment.

[0028] Fig.21 It is a right side view of the electric pump 2 according to the eleventh embodiment.

[0029] Fig. 22 It is a right side view of the electric pump 2 according to the twelfth embodiment.

[0030] Fig.23 It is a top view of the electric pump 2 according to the thirteenth embodiment.

[0031] Fig.24 It is a top view of the electric pump 2 according to the fourteenth embodiment.

[0032] Fig.25 It is a right side view of the electric pump 2 according to the fifteenth embodiment.

[0033] Fig.26 It is a right side view of the electric pump 2 according to the sixteenth embodiment. DETAILED DESCRIPTION

[0034] With reference to the accompanying drawings, representative and non-limiting specific examples of the present invention are described in detail below. The detailed description is intended only to show the details of the preferred examples for implementing the present invention to those skilled in the art, and is not intended to limit the scope of the present invention. In addition, the disclosed additional features and inventions can be used separately with other features and inventions, or can be used together with other features and inventions to provide further improved electric pumps and methods of manufacturing and using the same.

[0035] In addition, the combination of features and processes disclosed in the following detailed description is not necessary in the broadest sense for implementing the present invention, but is only recorded for the purpose of specifically illustrating the representative specific examples of the present invention. Moreover, when providing additional and useful embodiments of the present invention, the various features of the following representative specific examples and the various features described in the claims do not necessarily have to be combined as in the specific examples or the order in which they are described.

[0036] Different from the structures of the features described in the embodiments and / or claims, all the features described in this specification and / or claims are intended to be disclosed individually and independently of each other as limitations on the original disclosure and the specific matters described in the claims. Moreover, all numerical ranges and records involving groups or groups are intended to disclose their intermediate structures as limitations on the original disclosure and the specific matters described in the claims.

[0037] In one or more embodiments, the electric motor may be a brushless motor having a stator and a rotor. The motor unit may further include: a control unit housed in the main body housing and driving the electric motor; and a fan rotating integrally with the rotor. The fan may generate an air flow inside the main body housing to cool the control unit by rotating.

[0038] According to the above configuration, it is possible to suppress overheating of the control unit.

[0039] In one or more embodiments, the motor unit may be detachable from the pump unit.

[0040] According to the above configuration, when a failure occurs in the pump unit, the pump unit can be easily replaced.

[0041] In one or more embodiments, one end of the motor unit may be supported by the pump unit, and the other end of the motor unit may be a free end.

[0042] According to the above configuration, the structure of the electric pump can be simplified compared to a configuration in which one end and the other end of the motor unit are supported by the pump unit.

[0043] In one or more embodiments, the electric pump may further include a contact portion that is disposed on a lower side of the main body case and contacts the mounting surface when the electric pump is mounted on the mounting surface.

[0044] According to the above configuration, it is possible to suppress the main body casing from coming into contact with the placement surface.

[0045] In one or more embodiments, when the electric pump is placed on the placement surface, the battery holding portion may be arranged above the electric motor.

[0046] According to the above configuration, when the placement surface is wetted with water, it is possible to suppress contact between the water and the battery holding portion.

[0047] In one or more embodiments, the electric motor may rotate around a central axis extending in the front-rear direction. Alternatively, the length of the main body housing may be shorter than the length of the contact portion in a left-right direction orthogonal to the front-rear direction and the up-down direction orthogonal to the mounting surface.

[0048] In a structure in which the length of the main body case is longer than the length of the contact portion, the electric pump may fall down when an external force is applied to the main body case. According to the above structure, it is possible to suppress the electric pump from falling down when an external force is applied to the main body case.

[0049] In one or more embodiments, the length of the main body case in the left-right direction may be shorter than the length of the pump unit.

[0050] In the structure in which the pump is driven by the engine, the length of the main body shell is longer than the length of the pump unit in the left-right direction. As a result, the pump is enlarged. According to the above structure, the length of the main body shell is shorter than the length of the pump unit in the left-right direction, so the electric pump can be suppressed from being enlarged.

[0051] In one or more embodiments, the electric pump may further include a handle, which is fixed to the pump unit and includes a grip portion to be gripped by a user. The electric motor may rotate around a central axis extending in the front-rear direction. The center of gravity of the electric pump may be farther from the pump unit than from the center of gravity of the electric pump to the grip portion.

[0052] According to the above configuration, when the user grasps the grip portion and lifts the electric pump, it is possible to suppress the electric pump from tilting so that the pump unit faces downward.

[0053] In one or more embodiments, the motor unit may further include a control unit that is housed in the main body housing and drives the electric motor. Alternatively, when the electric pump is placed on the placement surface, the electric motor and the battery holding portion may at least partially overlap when the electric pump is viewed in a vertical direction perpendicular to the placement surface.

[0054] According to the above configuration, compared with a configuration in which the electric motor does not overlap the battery holding portion when the electric pump is viewed in the up-down direction, it is possible to suppress an increase in size of the electric pump in the front-back direction.

[0055] In one or more embodiments, when the electric pump is placed on the placement surface, the electric motor and the control unit may at least partially overlap when the electric pump is viewed in the up-down direction.

[0056] According to the above configuration, compared with a configuration in which the electric motor does not overlap the control unit when the electric pump is viewed in the up-down direction, it is possible to suppress an increase in size of the electric pump in the front-back direction.

[0057] In one or more embodiments, the electric motor may rotate around a central axis extending in the front-rear direction. Alternatively, the center of the battery holding portion and the center of the electric motor may be arranged on a first plane in a left-right direction orthogonal to the front-rear direction and the up-down direction.

[0058] According to the above configuration, compared with a configuration in which the center of the battery holding portion and the center of the electric motor are not arranged on the first plane in the left-right direction, it is possible to suppress an increase in size of the electric pump in the left-right direction.

[0059] In one or more embodiments, the center of the control unit may be arranged on the first plane in the left-right direction.

[0060] According to the above configuration, compared with a configuration in which the center of the control unit in the left-right direction is not arranged on the first plane, it is possible to suppress an increase in size of the electric pump in the left-right direction.

[0061] In one or more embodiments, the pump unit may have a spray port for spraying water. The main body housing may have an upper wall, on which a battery holding portion is arranged, and the upper wall is arranged below the spray port when the electric pump is placed on the placement surface. The upper wall may be inclined relative to the placement surface when the electric pump is placed on the placement surface.

[0062] According to the above configuration, even if part of the water ejected from the ejection port contacts the upper wall, the water flows on the upper wall and falls toward the placement surface, thereby preventing the water from remaining on the upper wall.

[0063] In one or more embodiments, the battery holding unit may hold two battery packs.

[0064] According to the above configuration, it is possible to extend the driving time of the electric pump or to increase the power of the electric pump.

[0065] (First embodiment)

[0066] like Figure 1 As shown, the electric pump 2 is an electrical device for conveying liquid, such as water, under pressure. The electric pump 2 includes a battery pack BP. The electric pump 2 is driven by the power of the battery pack BP. The battery pack BP includes a secondary battery that can be charged and discharged, such as a lithium-ion battery. The battery pack BP is a highly versatile battery pack. The battery pack BP can also be used in electrical devices other than the electric pump 2. Figure 2 As shown, for example, the battery pack BP can also be used in a reinforcing bar binding machine 3 that binds a plurality of reinforcing bars R using a metal wire W. In addition, the battery pack BP is not limited to being used in the electric pump 2 and the reinforcing bar binding machine 3, and can also be used in, for example, a gardening product such as an impact driver, a hammer drill, a lawn mower, a brush cutter, a blower, a hedge trimmer, a chain saw, a transporter, a snowplow, and a tiller.

[0067] like Figure 1 As shown in FIG. 1 , the electric pump 2 includes a motor unit 4, a pump unit 6, a handle 8, a throttle lever 10, and a base 12. Next, when the electric pump 2 is placed on a placement surface P (see FIG. 1 ), Figure 5 ), the direction perpendicular to the loading surface P is called the up-down direction, the direction perpendicular to the up-down direction is called the front-back direction, and the direction perpendicular to the up-down direction and the front-back direction is called the left-right direction.

[0068] like Figure 3 As shown in FIG. 1 , the motor unit 4 includes a main body housing 20. The main body housing 20 is formed of a resin material. The main body housing 20 includes a right main body housing 22 and a left main body housing 24. The right main body housing 22 and the left main body housing 24 have a shape in which the main body housing 20 is divided into two halves by a plane including the front-back direction and the up-down direction. A storage space 26 (see FIG. 1 ) is defined between the right main body housing 22 and the left main body housing 24. Figure 5 ).

[0069] The main body housing 20 includes a right wall 30, a left wall 32, a lower wall 34, and a rear upper wall 36 (see Figure 5 ), a front upper wall 38, a rear wall 40, a front vertical wall 42, and a front horizontal wall 44.

[0070] like Figure 4 As shown, the right wall 30 has a first exhaust port 46. The first exhaust port 46 allows the storage space 26 (see Figure 5 ) is connected to the space outside the main body shell 20.

[0071] like Figure 3 As shown, the left wall 32 has a second exhaust port 48. The second exhaust port 48 allows the storage space 26 (see Figure 5 ) is connected to the space outside the main body shell 20.

[0072] like Figure 5 As shown, the lower wall 34 is inclined relative to the loading surface P. The lower wall 34 extends toward the upper rear side. The inclination angle of the lower wall 34 relative to the loading surface P is greater than 5 degrees and less than 30 degrees. The rear upper wall 36 is inclined relative to the loading surface P. The rear upper wall 36 extends toward the lower rear side. The inclination angle of the rear upper wall 36 relative to the loading surface P is, for example, greater than 5 degrees and less than 45 degrees. The inclination angle of the rear upper wall 36 relative to the loading surface P is greater than the inclination angle of the lower wall 34 relative to the loading surface P.

[0073] The front upper wall 38 is substantially parallel to the mounting surface P. Figure 3 As shown, a main power switch 50 is disposed on the front upper wall 38. The main power switch 50 receives an operation by a user to switch the electric pump 2 between an on state and an off state.

[0074] The front vertical wall 42 extends upward from the front end of the lower wall 34. The front vertical wall 42 is substantially parallel to the rear wall 40. The front horizontal wall 44 extends forward from the upper end of the front vertical wall 42. The front horizontal wall 44 is substantially parallel to the placement surface P.

[0075] like Figure 3 As shown, the main body housing 20 includes a throttle cover 52 and an air intake cover 54 (see Figure 4 The throttle cover 52 is fixed to the left main body case 24. The throttle cover 52 is arranged at a position behind the second exhaust port 48. A throttle wire 56 is passed through the throttle cover 52. The throttle wire 56 extends forward from the throttle cover 52. The throttle wire 56 is fixed to the throttle rod 10 (see Figure 1 The motor unit 4 further includes a detector 57 disposed inside the adjustment cover 52, and the detector 57 detects the pulling amount of the adjustment wire 56. Figure 3 In FIG. 5 , the detector 57 is indicated by a dotted line.

[0076] like Figure 4 As shown in FIG. 2 , the air intake cover 54 is fixed to the right main body case 22. The air intake cover 54 is arranged at a position behind the first exhaust port 46. The air intake cover 54 has an air intake port 58. The air intake port 58 makes the storage space 26 (see FIG. 2 ) Figure 5 ) is connected to the space outside the main body shell 20.

[0077] The main body case 20 includes a substrate storage portion 62, a motor storage portion 64, and a battery holding portion 66. The substrate storage portion 62 is located at the lower portion of the main body case 20. The motor storage portion 64 is disposed above the substrate storage portion 62. The battery holding portion 66 is disposed above the motor storage portion 64.

[0078] like Figure 6 As shown in FIG. 1 , the battery holding portion 66 is disposed on the rear upper wall 36. The battery holding portion 66 includes a right rail 68, a left rail 70, and a connecting wall 72. The right rail 68 and the left rail 70 are used to hold the battery pack BP (see FIG. 1 ). Figure 3 ) is held by the guide rails of the battery holding portion 66. The right guide rail 68 and the left guide rail 70 are connected to the guide rail 74 of the battery pack BP (see Figure 5 ) are engaged in a slidable manner. The right guide rail 68 is arranged at the right end of the rear upper wall 36 and extends from the rear end to the front end of the rear upper wall 36. The left guide rail 70 is arranged at the left end of the rear upper wall 36 and extends from the rear end to the front end of the rear upper wall 36. The front end of the right guide rail 68 and the front end of the left guide rail 70 are connected to the connecting wall 72. Figure 3 As shown in FIG. 1 , the battery pack BP is mounted on the battery holding portion 66 by sliding the battery pack BP toward the front upper side. Also, the battery pack BP is removed from the battery holding portion 66 by sliding the battery pack BP toward the rear lower side.

[0079] like Figure 7 As shown, the motor unit 4 includes a control unit 76, a battery terminal 78, a motor housing 80, an electric motor 82, a fan 84, and an output unit 86. The control unit 76, the motor housing 80, the electric motor 82, the fan 84, and the output unit 86 are arranged in the storage space 26.

[0080] The control unit 76 is disposed in the substrate storage portion 62. The control unit 76 is electrically connected to the main power switch 50, the battery terminal 78, and the electric motor 82. The control unit 76 operates using the power supplied from the battery pack BP via the battery terminal 78. The control unit 76 drives the electric motor 82 by supplying the power supplied from the battery pack BP to the electric motor 82.

[0081] The control unit 76 includes: a control substrate 90 having a microcomputer and a plurality of switching elements; and a metal housing 92. The switching element is, for example, an IGBT or a MOSFET. The switching element is controlled by the microcomputer to switch between a connected state and a disconnected state. The electric motor 82 is controlled by switching the connected state and the disconnected state of the switching element. The control substrate 90 is housed in the housing 92. The control substrate 90 and the housing 92 are arranged along the lower wall 34. The housing 92 includes a heat sink 94 extending in the downward direction. In the front-to-back direction, the battery retaining portion 66 is arranged between the front end and the rear end of the control unit 76. The front end of the control unit 76 corresponds to the front end of the housing 92, and the rear end of the control unit 76 corresponds to the rear end of the housing 92. When the electric pump 2 is viewed in the downward direction, the control unit 76 and the battery retaining portion 66 at least partially overlap. As Figure 8 As shown, the length L1 of the control unit 76 in the left-right direction is shorter than the length L2 of the battery holding part 66 in the left-right direction and the length L3 of the main body shell 20 in the left-right direction. The length L1 is the length between the right end and the left end of the control unit 76. The right end of the control unit 76 corresponds to the right end of the shell 92, and the left end of the control unit 76 corresponds to the left end of the shell 92. In addition, the length L2 is shorter than the length L3. The center 76a of the control unit 76 in the left-right direction and the center 66a of the battery holding part 66 in the left-right direction are arranged on the first plane 96. The center 76a is the center between the right end and the left end of the shell 92. The center 66a is the center between the right end and the left end of the battery holding part 66. The first plane 96 is orthogonal to the placement surface P and is a plane including the front-back direction and the up-down direction. In addition, the first plane 96 is arranged at the boundary between the right main body shell 22 and the left main body shell 24. In addition, the center of gravity G1 of the electric pump 2 is arranged on the first plane 96.

[0082] like Figure 7 As shown, the battery terminal 78 is arranged on the rear upper wall 36. The battery terminal 78 is exposed in the space outside the main body shell 20. The battery terminal 78 is electrically connected to the terminal (not shown) of the battery pack BP when the battery pack BP is held in the battery holding portion 66. In the front-to-back direction, the battery terminal 78 is arranged between the front end and the rear end of the control unit 76. When the electric pump 2 is viewed in the downward direction, the battery terminal 78 and the control unit 76 at least partially overlap. Figure 8 As shown, the length L4 of the battery terminal 78 in the left-right direction is shorter than the length L1 of the control unit 76 in the left-right direction. The center 78a of the battery terminal 78 in the left-right direction is arranged on the first plane 96. The center 78a corresponds to the center between the right end and the left end of the battery terminal 78.

[0083] like Figure 7 As shown, the motor housing 80 is disposed in the motor housing portion 64. The motor housing 80 has a plurality of motor air inlets 98 at the rear end (see Figure 8 In the vertical direction, the motor housing 80 is disposed between the battery holder 66 and the control unit 76. When the electric pump 2 is viewed in the downward direction, the motor housing 80 at least partially overlaps the battery holder 66, the control unit 76, and the battery terminal 78.

[0084] The electric motor 82 is housed in the motor housing 80. The electric motor 82 is supported by the main body housing 20 by means of the motor housing 80. The electric motor 82 is, for example, a DC motor. The electric motor 82 is, for example, an inner rotor type brushless motor. In a modified example, the electric motor 82 may be an outer rotor type brushless motor or a brushed motor. The maximum output value of the electric motor 82 may be greater than 0.5 kW and less than 2.0 kW, or may be, for example, greater than 0.5 kW and less than 1.5 kW, or may be, for example, greater than 0.5 kW and less than 1.2 kW, or may be, for example, greater than 0.5 kW and less than 1.0 kW.

[0085] In the vertical direction, the electric motor 82 is arranged below the battery holder 66 and above the control unit 76. When the electric pump 2 is viewed downward, the electric motor 82 at least partially overlaps the battery holder 66, the control unit 76, and the battery terminal 78. Figure 8 As shown, the length L5 (i.e., diameter) of the electric motor 82 in the left-right direction is shorter than the length L2 of the battery holding portion 66 in the left-right direction and longer than the length L4 of the battery terminal 78 in the left-right direction. The length L5 is substantially the same as the length L1. The center 82a of the electric motor 82 in the left-right direction is arranged on the first plane 96. The center 82a is the center between the right end and the left end of the electric motor 82.

[0086] like Figure 7As shown, the electric motor 82 includes a stator 100 and a rotor 102. The diameter of the stator 100 corresponds to the diameter of the electric motor 82. In addition, the right end and the left end of the stator 100 correspond to the right end and the left end of the electric motor 82, respectively. The stator 100 includes a stator core 104 and a plurality of coils 106. Each coil 106 is wound around the stator core 104. The rotor 102 penetrates the stator 100 in the front-to-back direction. The rotor 102 includes a rotor body 110, and the rotor body 110 includes a plurality of permanent magnets 108. The motor unit 4 further includes a shaft 112, and the shaft 112 penetrates the rotor body 110 in the front-to-back direction. The shaft 112 extends in the front-to-back direction. The rear end of the shaft 112 is rotatably supported by the motor housing 80 via a bearing 114. The front end of the shaft 112 is rotatably supported by the output unit 86 via a bearing 116. When the microcomputer of the control unit 76 selectively switches the switch element between the connected state and the disconnected state, the power of the battery pack BP is supplied to each coil 106. The rotor body 110 rotates around the central axis AX extending in the front-rear direction by the magnetic field generated in each coil 106. As a result, the shaft 112 rotates around the central axis AX.

[0087] The fan 84 is fixed to the shaft 112 outside the motor housing 80. The fan 84 is a centrifugal fan. In a modified example, the fan 84 may also be an axial flow fan. The fan 84 rotates integrally with the shaft 112 around the central axis AX.

[0088] If the fan 84 rotates, Figure 8 As shown, an air flow is generated in the storage space 26. First, air flows into the storage space 26 from the space outside the main body shell 20 through the air inlet 58. In addition, in the drawings, the flow of air is represented by an arrow line represented by the reference numeral F. After the inflowing air flows downward along the rectifying plate 54a of the air inlet cover 54, the electric pump 2 flows in a clockwise direction around the control unit 76 when viewed in the forward direction. The housing 92 is cooled by the contact between the air and the heat sink 94. As a result, the control substrate 90 is cooled. As shown in FIG. Figure 7 As shown, the air then flows from between the control unit 76 and the battery terminals 78 toward the plurality of motor air intakes 98. Thus, the control unit 76 and the battery terminals 78 are cooled.

[0089] The air flows into the motor housing 80 through the motor air inlet 98. The inflowing air flows forward in the motor housing 80. Thus, the electric motor 82 is cooled. When the air flows to the fan 84, the fan 84 conveys the air in a direction away from the center axis AX. Thereafter, the air is discharged through the first exhaust port 46 (see FIG. Figure 4 ) and the second exhaust port 48 (refer to Figure 3 ) and discharged to the space outside the main body shell 20.

[0090] like Fig. 9 As shown, the output unit 86 is disposed at the front of the motor housing portion 64. The output unit 86 penetrates the front end of the main body housing 20. The output unit 86 is fixed to the front end of the main body housing 20. The output unit 86 is fixed to the front end of the motor housing 80.

[0091] The output unit 86 includes a mounting base 120 , a supporting member 122 , and a main shaft 124 .

[0092] The mounting base 120 includes a cylinder 126 and a partition wall 128. The inner surface of the cylinder 126 has a substantially circular cross-sectional shape. Figure 3 As shown, the cylinder 126 has a plurality of (four in this embodiment) threaded holes 130. The threaded holes 130 are arranged on the front surface of the cylinder 126. The front surface of the cylinder 126 corresponds to the front surface of the motor unit 4.

[0093] like Fig. 9 As shown, the partition wall portion 128 has a substantially disk shape. The partition wall portion 128 is disposed inside the cylinder portion 126. The partition wall portion 128 is connected to the inner surface of the cylinder portion 126. The partition wall portion 128 divides the internal space of the cylinder portion 126 into a front space 132 and a rear space 134. The shaft 112 passes through the partition wall portion 128. The partition wall portion 128 supports the shaft 112 in a rotatable manner by means of the bearing 116. The fan 84 is disposed in the rear space 134.

[0094] The support member 122 is disposed in the front space 132. The support member 122 is fixed to the front surface of the partition wall portion 128.

[0095] The main shaft 124 extends in the front-rear direction. The main shaft 124 penetrates the support member 122 in the front-rear direction. The main shaft 124 is rotatably supported by the support member 122 via the bearing 136. The rear end of the main shaft 124 is fitted with the front end of the shaft 112. The main shaft 124 rotates integrally with the shaft 112 around the central axis AX.

[0096] like Figure 5 As shown, the pump unit 6 is connected to a plurality of threaded holes 130 (see FIG. Figure 3 ) is screwed and fixed to the front end of the motor unit 4. The pump unit 6 can be detached relative to the motor unit 4. The pump unit 6 supports the front end (i.e., the fixed end) of the motor unit 4, but does not support the rear end (i.e., the free end) of the motor unit 4. That is, the pump unit 6 supports the motor unit 4 using a cantilever structure.

[0097] like Fig.10As shown, the length L6 of the pump unit 6 in the left-right direction is longer than the length L3 of the main body case 20. The main body case 20 is arranged between the left end and the right end of the pump unit 6 in the left-right direction.

[0098] like Fig.11 As shown, the pump unit 6 includes a rear pump casing 140 , a front pump casing 142 , an inner casing 144 , and an impeller 146 .

[0099] The rear pump housing 140 has a flat plate shape along the up-down direction and the left-right direction. The rear surface of the rear pump housing 140 abuts against the front end of the mounting base 120 (i.e., the front end of the motor unit 4). The rear pump housing 140 has a through hole 148. The main shaft 124 passes through the through hole 148. A sealing body 149 is arranged between the main shaft 124 and the rear pump housing 140. The sealing body 149 prevents the liquid from passing through between the main shaft 124 and the rear pump housing 140. The main shaft 124 is supported by the rear pump housing 140 in a rotatable manner via the sealing body 149.

[0100] The front pump housing 142 is disposed on the front side of the rear pump housing 140. The front pump housing 142 includes a housing portion 150, a suction portion 152, and a discharge portion 154.

[0101] The storage portion 150 is secured by screws 156 (see Figure 1 ) is fixed to the rear pump housing 140. A sealing ring 157 is arranged between the storage portion 150 and the rear pump housing 140. Figure 1 As shown, the storage part 150 has a drain port 158. The drain port 158 ​​allows the inside of the storage part 150 to communicate with the outside. Usually, the drain port 158 ​​is closed by a cover 159.

[0102] The suction part 152 extends forward from the front end of the storage part 150. The suction part 152 is arranged above the drain port 158. The suction part 152 is installed on a water supply device (not shown). Fig.11 As shown in FIG. 1 , the suction portion 152 has a suction passage 160 extending in the front-rear direction. Figure 5 and Fig.11 In the figure, the drain port 158 ​​and the cover 159 are omitted. The suction passage 160 is connected to the space inside the storage portion 150. Hereinafter, the front end of the suction passage 160 is sometimes referred to as the suction port 162. The suction passage 160 is arranged at a position above the main shaft 124. Figure 5 As shown, the suction passage 160 is arranged below both the battery holding portion 66 and the battery terminal 78. The suction passage 160 is arranged above the control unit 76.

[0103] like Figure 1As shown in FIG. 1 , the ejection portion 154 extends upward from the upper end of the storage portion 150 and then bends and extends leftward. Fig.11 As shown in FIG. 1 , the ejection portion 154 has an ejection passage 164. The ejection passage 164 is connected to the space inside the storage portion 150. The ejection passage 164 extends upward and then bends and extends to the left. Hereinafter, the left end of the ejection passage 164 is sometimes referred to as an ejection port 166. Figure 5 and Fig.11 In FIG. 1 , the position of the discharge port 166 is shown by a dotted line. The discharge port 166 is arranged at a position above the suction port 162. Figure 5 As shown, the discharge port 166 is arranged above both the battery holding portion 66 and the battery terminal 78 .

[0104] like Fig.11 As shown, the ejection portion 154 has a water injection port 168. The water injection port 168 allows the ejection passage 164 to communicate with the space outside the pump unit 6. Normally, the water injection port 168 is closed by a cap 170.

[0105] The inner housing 144 has a swirl chamber 174 inside. The swirl chamber 174 extends in a swirl shape with the central axis AX as the center. When the inner housing 144 is accommodated in the accommodation portion 150, a suction space 176 and a discharge space 178 are formed between the inner housing 144 and the accommodation portion 150. The suction space 176 is not directly connected to the discharge space 178. The swirl chamber 174 is connected to the suction passage 160 via the suction space 176. The swirl chamber 174 is connected to the discharge passage 164 via the discharge space 178.

[0106] The impeller 146 is disposed in the vortex chamber 174. The impeller 146 is engaged with the front end of the main shaft 124. Figure 5 As shown, the impeller 146 is arranged below the battery holding portion 66 and the battery terminal 78. The impeller 146 is arranged above the control unit 76. The diameter of the impeller 146 is larger than the diameter of the electric motor 82.

[0107] When the electric pump 2 is activated, first, Figure 5 As shown, after removing the cover 170, water is poured into the pump unit 6 from the water inlet 168. Thus, the pump unit 6 is filled with water. Next, the electric motor 82 is operated. Thus, the impeller 146 rotates integrally with the shaft 112 and the main shaft 124 around the central axis AX. Fig.11As shown, if the impeller 146 rotates, water supplied from a water supply device (not shown) flows into the suction passage 160 from the suction port 162. The water flows into the vortex chamber 174 after passing through the suction passage 160 and the suction space 176 in sequence. Then, the water is transported by the impeller 146 in a direction away from the central axis AX and flows in the vortex chamber 174. Finally, the water passes through the ejection space 178 and the ejection passage 164 in sequence and is ejected from the ejection port 166. Next, if the electric motor 82 (see Figure 5 ) stops, the rotation of the impeller 146 stops. As a result, the ejection of water from the ejection port 166 stops. Figure 1 As shown, the cover 159 is removed from the pump unit 6. As a result, water is discharged from the drain port 158 ​​to the outside of the pump unit 6.

[0108] The handle 8 has a substantially U-shaped shape. The handle 8 includes a right connecting portion 182 , a left connecting portion 184 , and a grip portion 186 .

[0109] One end of the right connection portion 182 and one end of the left connection portion 184 are fixed to the rear pump housing 140. The right connection portion 182 and the left connection portion 184 extend from the rear pump housing 140 toward the rear upper side.

[0110] The grip portion 186 is gripped by the user. The grip portion 186 is connected to the other end of the right connection portion 182 and the other end of the left connection portion 184. The grip portion 186 extends in the left-right direction. Figure 5 As shown, the holding portion 186 is arranged at a position above the ejection portion 154, the battery pack BP, the battery retaining portion 66, and the battery terminal 78. In the front-to-back direction, the holding portion 186 is arranged at a position farthest from the rear pump housing 140. In the front-to-back direction, the holding portion 186 is arranged at a position closer to the rear side than the rear pump housing 140. In the front-to-back direction, the holding portion 186 is arranged at a position closer to the front side than the control unit 76, the battery terminal 78, the electric motor 82, and the center of gravity G1 of the electric pump 2. In the front-to-back direction, the distance between the center of gravity G1 of the electric pump 2 and the rear pump housing 140 is farther than the distance between the center of gravity G1 of the electric pump 2 and the holding portion 186. As shown in FIG. Fig.10 As shown in FIG. 1 , in the left-right direction, the center 186a of the gripping portion 186 is disposed on the first plane 96. The center 186a is the center between the right end and the left end of the gripping portion 186.

[0111] The adjustment rod 10 is mounted on the right connecting portion 182. The adjustment rod 10 is operated by the user. When the adjustment rod 10 is operated, the adjustment line 56 (see Figure 3 ). Control unit 76 (refer to Figure 5 ) Based on detector 57 (refer to Figure 3 ) detects the pulling amount of the adjustment line 56 so that the electric motor 82 (refer to Figure 5As the amount of operation of the adjustment lever 10 increases (ie, as the amount of pulling of the adjustment wire 56 increases), the rotation speed of the electric motor 82 (ie, the rotation speed of the shaft 112) gradually increases from zero.

[0112] like Figure 5 As shown, the base 12 is fixed to the lower end of the rear pump housing 140. The base 12 has a flat plate shape along the front-to-back direction and the left-to-right direction. The base 12 is arranged at a position lower than the main housing 20. When the electric pump 2 is placed on the placement surface P, only the base 12 is in contact with the placement surface P. In the front-to-back direction, the front end of the base 12 is arranged at a position forward of the main housing 20 and the rear pump housing 140. In the front-to-back direction, the rear end of the base 12 is arranged at a position substantially the same as the rear end of the main housing 20, and is arranged forward of the rear end of the battery pack BP. As shown in FIG. Fig.10 As shown, the length L7 of the base 12 in the left-right direction is longer than the length L3 of the main body case 20 in the left-right direction and the length L6 of the pump unit 6 in the left-right direction. In the left-right direction, the main body case 20 and the pump unit 6 are arranged between the left end and the right end of the base 12. When the electric pump 2 is viewed in the downward direction, the entire main body case 20 overlaps with the base 12.

[0113] (Effect)

[0114] The electric pump 2 of this embodiment includes: a motor unit 4; and a pump unit 6 that is driven by the motor unit 4 and can spray water. The motor unit 4 includes: a main body case 20 that includes a battery holding portion 66 that can hold a battery pack BP; and an electric motor 82 that is accommodated in the main body case 20 and drives the pump unit 6. The battery pack BP can be used in the electric pump 2 and a reinforcing bar tying machine 3 (an example of equipment) other than the electric pump 2.

[0115] According to the above-mentioned structure, the battery pack BP with high versatility is used in the electric pump 2. Thus, the electric pump 2 can be used easily.

[0116] The electric motor 82 is a brushless motor including a stator 100 and a rotor 102. The motor unit 4 further includes a control unit 76 housed in the main body case 20 and driving the electric motor 82, and a fan 84 that rotates integrally with the rotor 102. The fan 84 generates an air flow inside the main body case 20 to cool the control unit 76 by rotating.

[0117] According to the above-mentioned configuration, it is possible to suppress overheating of the control unit 76 .

[0118] In addition, the motor unit 4 is attachable to and detachable from the pump unit 6 .

[0119] According to the above-described configuration, when a failure occurs in the pump unit 6 , the pump unit 6 can be easily replaced.

[0120] In addition, one end of the motor unit 4 is supported by the pump unit 6. The other end of the motor unit 4 is a free end.

[0121] According to the above-described configuration, the structure of the electric pump 2 can be simplified compared to a configuration in which one end and the other end of the motor unit 4 are supported by the pump unit 6 .

[0122] The electric pump 2 further includes a base 12 (an example of a contact portion) which is disposed on the lower side of the main body case 20 and contacts the placement surface P when the electric pump 2 is placed on the placement surface P.

[0123] According to the above-described configuration, the main body housing 20 can be prevented from coming into contact with the placement surface P.

[0124] When the electric pump 2 is placed on the placement surface P, the battery holding portion 66 is disposed above the electric motor 82 .

[0125] According to the above-described configuration, it is possible to suppress contact between the water and the battery holding portion 66 when the placement surface P is wetted with water.

[0126] The electric motor 82 rotates about the central axis AX extending in the front-rear direction. In the left-right direction orthogonal to the front-rear direction and the up-down direction orthogonal to the placement surface P, the length L3 of the main body housing 20 is shorter than the length L7 of the base 12 .

[0127] In a configuration where the length L3 of the body case 20 is longer than the length L7 of the base 12, the electric pump 2 may fall down when an external force is applied to the body case 20. With the above configuration, the electric pump 2 can be prevented from falling down when an external force is applied to the body case 20.

[0128] Furthermore, in the left-right direction, a length L3 of the main body case 20 is shorter than a length L6 of the pump unit 6 .

[0129] In the structure in which the pump is driven by the engine, the length L3 of the main body case 20 in the left-right direction is longer than the length L6 of the pump unit 6. As a result, the pump is enlarged. According to the above structure, the length L3 of the main body case 20 in the left-right direction is shorter than the length L6 of the pump unit 6, so it is possible to suppress the electric pump 2 from being enlarged.

[0130] The electric pump 2 also includes a handle 8, which is fixed to the pump unit 6 and includes a grip 186 to be gripped by a user. The electric motor 82 rotates around a central axis AX extending in the front-rear direction. The distance between the center of gravity G1 of the electric pump 2 and the pump unit 6 is greater than the distance between the center of gravity G1 of the electric pump 2 and the grip 186.

[0131] According to the above-described configuration, it is possible to suppress the electric pump 2 from tilting so that the pump unit 6 faces downward when the user grasps the grip portion 186 and lifts the electric pump 2 .

[0132] The motor unit 4 further includes a control unit 76 which is housed in the main body case 20 and drives the electric motor 82. When the electric pump 2 is placed on the placement surface P, the electric motor 82 and the battery holding portion 66 at least partially overlap when the electric pump 2 is viewed in the up-down direction perpendicular to the placement surface P.

[0133] According to the above configuration, compared with a configuration in which the electric motor 82 does not overlap the battery holding portion 66 when the electric pump 2 is viewed in the up-down direction, an increase in size of the electric pump 2 in the front-back direction can be suppressed.

[0134] In addition, when the electric pump 2 is placed on the placement surface P, the electric motor 82 and the control unit 76 at least partially overlap when the electric pump 2 is viewed in the up-down direction.

[0135] According to the above configuration, compared with a configuration in which the electric motor 82 does not overlap the control unit 76 when the electric pump 2 is viewed in the up-down direction, it is possible to suppress an increase in size of the electric pump 2 in the front-back direction.

[0136] The center 66a of the battery holding portion 66 and the center 82a of the electric motor 82 are arranged on the first plane 96 in the left-right direction orthogonal to the front-back direction and the up-down direction.

[0137] According to the above configuration, compared with a configuration in which the center 66a of the battery holding portion 66 and the center 82a of the electric motor 82 are not arranged on the first plane 96 in the left-right direction, it is possible to suppress an increase in size of the electric pump 2 in the left-right direction.

[0138] Furthermore, in the left-right direction, the center 76 a of the control unit 76 is arranged on the first plane 96 .

[0139] According to the above-described configuration, compared with a configuration in which the center 76 a of the control unit 76 is not disposed on the first plane 96 in the left-right direction, it is possible to suppress an increase in size of the electric pump 2 in the left-right direction.

[0140] In addition, the pump unit 6 has a spray port 166 for spraying water. The main body case 20 includes a rear upper wall 36 (an example of an upper wall), on which a battery holding portion 66 is arranged, and the rear upper wall 36 is arranged below the spray port 166 when the electric pump 2 is placed on the placement surface P. The rear upper wall 36 is inclined relative to the placement surface P when the electric pump 2 is placed on the placement surface P.

[0141] According to the above configuration, even if part of the water ejected from the ejection port 166 contacts the rear upper wall 36 , the water flows on the rear upper wall 36 and falls toward the placement surface P. This can prevent the water from remaining on the rear upper wall 36 .

[0142] (Second embodiment)

[0143] In the second embodiment, only the points different from the first embodiment are described. Fig.12 As shown, the control unit 76 is arranged on the rear side of the electric motor 82. The control unit 76 is arranged along a surface including the up-down direction and the left-right direction. When the electric pump 2 is viewed in the forward direction, the control unit 76 overlaps at least partially with the electric motor 82 and the impeller 146, respectively. The battery pack BP is detached from the battery holding portion 66 by sliding the battery pack BP on the battery holding portion 66 in parallel with the placement surface P. The installation direction of the battery pack BP to the battery holding portion 66 may be the forward direction, the left direction, or the right direction.

[0144] (Third embodiment)

[0145] In the third embodiment, only the points different from the first embodiment are described. Fig.13 As shown, the battery holding portion 66 is arranged on the rear side of the electric motor 82. The battery holding portion 66 is arranged along a surface including the up-down direction and the left-right direction. When the electric pump 2 is viewed in the forward direction, the battery holding portion 66 overlaps at least partially with the electric motor 82 and the impeller 146, respectively. The mounting direction of the battery pack BP to the battery holding portion 66 may be the downward direction, the left direction, or the right direction.

[0146] (Fourth embodiment)

[0147] In the fourth embodiment, only the points different from the first embodiment are described. Fig.14 As shown, the substrate storage portion 62 is disposed on the upper side of the motor storage portion 64. The substrate storage portion 62 extends in the rearward direction to a position beyond the rear end of the motor storage portion 64.

[0148] The battery holder 66 is arranged on the rear side of the electric motor 82. The battery holder 66 is arranged in the motor storage portion 64. The battery holder 66 is arranged along a surface including the up-down direction and the left-right direction. When the electric pump 2 is viewed in the forward direction, the battery holder 66 overlaps the electric motor 82 and the impeller 146 at least partially. The control unit 76 is arranged on the upper side of each of the electric motor 82 and the battery holder 66. The installation direction of the battery pack BP to the battery holder 66 may be the left direction or the right direction.

[0149] (Fifth embodiment)

[0150] In the fifth embodiment, only the points different from the fourth embodiment are described. Fig.15 As shown, the battery holding portion 66 is arranged at the rear lower part of the substrate storage portion 62. The battery holding portion 66 is arranged at a position above the electric motor 82 and below the control unit 76. The battery holding portion 66 is arranged along a surface including the front-to-back direction and the left-to-right direction. In the front-to-back direction, the battery holding portion 66 is arranged at a position rearward of the center of the control unit 76 in the front-to-back direction. When the electric pump 2 is viewed in the downward direction, the battery holding portion 66 and the control unit 76 at least partially overlap. The installation direction of the battery pack BP to the battery holding portion 66 can be the front direction, the left direction, or the right direction.

[0151] (Sixth embodiment)

[0152] In the sixth embodiment, only the points different from the first embodiment are described. Fig.16 As shown, the control unit 76 is arranged on the rear side of the electric motor 82. The control unit 76 is arranged along a surface including the up-down direction and the left-right direction. The battery holding portion 66 is arranged on the rear side of the control unit 76. The battery holding portion 66 is arranged along a surface including the up-down direction and the left-right direction. When the electric pump 2 is viewed in the forward direction, the battery holding portion 66 overlaps at least partially with the control unit 76, the electric motor 82, and the impeller 146, respectively. The installation direction of the battery pack BP to the battery holding portion 66 may be the downward direction, the left direction, or the right direction.

[0153] (Seventh embodiment)

[0154] In the seventh embodiment, only the points different from the first embodiment are described. Fig.17 As shown, the control unit 76 is arranged on the rear side of the electric motor 82. The control unit 76 is arranged along a plane including the up-down direction and the left-right direction.

[0155] The electric pump 2 includes two battery packs BP. Hereinafter, one battery pack BP is referred to as a first battery pack BP1, and the other battery pack BP is referred to as a second battery pack BP2.

[0156] The battery holding portion 66 includes a first battery holding portion 200 and a second battery holding portion 202. The first battery holding portion 200 holds the first battery pack BP1. The first battery pack BP1 can be installed and removed relative to the first battery holding portion 200. The installation direction of the first battery pack BP1 to the first battery holding portion 200 can be the front direction, the rear direction, or the left direction. The second battery holding portion 202 holds the second battery pack BP2. The second battery pack BP2 can be installed and removed relative to the second battery holding portion 202. The installation direction of the second battery pack BP2 to the second battery holding portion 202 can be the front direction, the rear direction, or the right direction.

[0157] The first battery holder 200 and the second battery holder 202 are arranged on the rear upper wall 36 of the main body case 20. The first battery holder 200 and the second battery holder 202 are arranged along a surface including the front-rear direction and the left-right direction. The first battery holder 200 and the second battery holder 202 are arranged in the left-right direction. When the electric pump 2 is viewed in the downward direction, the center 66a between the right end of the first battery holder 200 and the left end of the second battery holder 202 is arranged on the central axis AX. The center 66a between the right end of the first battery holder 200 and the left end of the second battery holder 202 corresponds to the center 66a of the battery holder 66 in the left-right direction. The first battery holder 200 and the second battery holder 202 are arranged on the upper side of the electric motor 82 and the control unit 76, respectively. When the electric pump 2 is viewed in the downward direction, the first battery holder 200 and the second battery holder 202 overlap the electric motor 82 and the control unit 76, respectively, at least partially.

[0158] (Effect)

[0159] In the present embodiment, the battery holding portion 66 holds two battery packs BP.

[0160] According to the above-described configuration, it is possible to extend the driving time of the electric pump 2 or to increase the power of the electric pump 2 .

[0161] (Eighth Embodiment)

[0162] In the eighth embodiment, only the points different from the seventh embodiment are described. Fig.18 As shown, the control unit 76 is arranged on the lower side of the electric motor 82. The control unit 76 is arranged along a plane including the front-rear direction and the left-right direction.

[0163] The first battery holding portion 200 and the second battery holding portion 202 are arranged on the rear wall 40. The first battery holding portion 200 and the second battery holding portion 202 are arranged along a surface including the up-down direction and the left-right direction. The first battery holding portion 200 and the second battery holding portion 202 are arranged on the rear side of the electric motor 82. When the electric pump 2 is viewed in the forward direction, the first battery holding portion 200 and the second battery holding portion 202 overlap the electric motor 82 and the impeller 146 at least partially, respectively. The installation direction of the first battery pack BP1 to the first battery holding portion 200 may be the downward direction or the left direction. The installation direction of the second battery pack BP2 to the second battery holding portion 202 may be the downward direction or the right direction.

[0164] (Ninth embodiment)

[0165] In the ninth embodiment, only the points different from the seventh embodiment are described. Fig.19As shown, the control unit 76 is arranged along a plane including the front-rear direction and the left-right direction. The control unit 76 is arranged below the electric motor 82, the first battery holding portion 200, and the second battery holding portion 202. When the electric pump 2 is viewed in the downward direction, the control unit 76 overlaps at least partially with the electric motor 82, the first battery holding portion 200, and the second battery holding portion 202.

[0166] (10th embodiment)

[0167] In the tenth embodiment, only the points different from the seventh embodiment are described. Fig. 20 As shown in FIG. 1 , the control unit 76 is arranged along a plane including the front-rear direction and the left-right direction. The control unit 76 is arranged below the electric motor 82 , the first battery holding portion 200 , and the second battery holding portion 202 .

[0168] The first battery holding portion 200 and the second battery holding portion 202 are arranged above the electric motor 82. The first battery holding portion 200 and the second battery holding portion 202 are arranged in the front-rear direction. The first battery pack BP1 may be mounted in the first battery holding portion 200 in the left direction or in the right direction. The second battery pack BP2 may be mounted in the second battery holding portion 202 in the left direction or in the right direction.

[0169] (11th embodiment)

[0170] In the eleventh embodiment, only the points different from the seventh embodiment are described. Fig.21 As shown, the control unit 76 is arranged on the lower side of the electric motor 82. The control unit 76 is arranged along a plane including the front-rear direction and the left-right direction.

[0171] The main body case 20 includes a protrusion 210 protruding upward from the upper rear portion of the motor housing portion 64. The first battery holding portion 200 is disposed at the rear end of the protrusion 210. The first battery holding portion 200 is disposed along a surface including the up-down direction and the left-right direction. The first battery pack BP1 may be mounted in the first battery holding portion 200 in the left direction or the right direction.

[0172] The second battery holding portion 202 is arranged at the rear end of the motor storage portion 64. The second battery holding portion 202 is arranged on the lower side of the first battery holding portion 200. The second battery holding portion 202 is arranged on the rear side of the electric motor 82. The second battery holding portion 202 is arranged along a surface including the up-down direction and the left-right direction. The installation direction of the second battery pack BP2 to the second battery holding portion 202 can be the left direction or the right direction.

[0173] (12th embodiment)

[0174] In the twelfth embodiment, only the points different from the seventh embodiment are described. Fig. 22 As shown, the front upper wall 38 of the main body housing 20 extends from the front end toward the rear upper side. The rear upper wall 36 of the main body housing 20 extends from the front end toward the rear lower side.

[0175] The first battery holding portion 200 and the second battery holding portion 202 are arranged on the rear upper wall 36. The first battery holding portion 200 is arranged on the upper side of the electric motor 82. The first battery pack BP1 may be installed in the first battery holding portion 200 in the left direction or the right direction. The second battery holding portion 202 is arranged at a position further back than the first battery holding portion 200. The second battery holding portion 202 is arranged on the upper side of the control unit 76. The second battery pack BP2 may be installed in the second battery holding portion 202 in the left direction or the right direction.

[0176] The control unit 76 is arranged below the electric motor 82. The control unit 76 is arranged along a plane including the front-rear direction and the left-right direction.

[0177] (13th embodiment)

[0178] In the 13th embodiment, only the points different from the 7th embodiment are described. Fig.23 As shown, the control unit 76 is arranged on the rear side of the electric motor 82. The control unit 76 is arranged along a surface including the up-down direction and the left-right direction. The first battery holding portion 200 and the second battery holding portion 202 are arranged on the rear side of the control unit 76. The first battery holding portion 200 and the second battery holding portion 202 are arranged along a surface including the up-down direction and the left-right direction. The first battery pack BP1 may be installed in the first battery holding portion 200 in the downward direction or in the left direction. The second battery pack BP2 may be installed in the second battery holding portion 202 in the downward direction or in the right direction.

[0179] (Example 14)

[0180] In the 14th embodiment, only the points different from the 7th embodiment are described. Fig.24 As shown, the control unit 76 is arranged on the lower side of the electric motor 82. The control unit 76 is arranged along a plane including the front-rear direction and the left-right direction.

[0181] The main body case 20 has a first recess 220 recessed in the left direction from the right wall 30 and a second recess 222 recessed in the right direction from the left wall 32. The first battery holding portion 200 and the second battery holding portion 202 are arranged between the first recess 220 and the second recess 222. The first battery holding portion 200 and the second battery holding portion 202 are arranged along a surface including the up-down direction and the front-back direction. The first battery pack BP1 is held in the first battery holding portion 200 in the first recess 220. The mounting direction of the first battery pack BP1 to the first battery holding portion 200 is the downward direction. The second battery pack BP2 is held in the second battery holding portion 202 in the second recess 222. The mounting direction of the second battery pack BP2 to the second battery holding portion 202 is the downward direction.

[0182] (15th embodiment)

[0183] In the fifteenth embodiment, only the points different from the seventh embodiment are described. Fig.25 As shown, the control unit 76 is arranged on the lower side of the electric motor 82. The control unit 76 is arranged along a plane including the front-rear direction and the left-right direction.

[0184] The first battery holding portion 200 is arranged on the rear upper wall 36. The first battery holding portion 200 is arranged on the upper side of the electric motor 82 and the control unit 76. The first battery holding portion 200 is arranged along a surface including the front-rear direction and the left-right direction. The first battery pack BP1 may be mounted in the first battery holding portion 200 in the front direction, the left direction, or the right direction.

[0185] The second battery holding portion 202 is arranged on the rear wall 40. The second battery holding portion 202 is arranged on the rear side of the electric motor 82. The second battery holding portion 202 is arranged along a surface including the up-down direction and the left-right direction. The second battery pack BP2 may be mounted in the second battery holding portion 202 in the downward direction, the left direction, or the right direction.

[0186] (Example 16)

[0187] In the 16th embodiment, only the points different from the 7th embodiment are described. Fig.26 As shown, the control unit 76 is arranged on the rear side of the electric motor 82. The control unit 76 is arranged along a plane including the up-down direction and the left-right direction.

[0188] The first battery holding portion 200 and the second battery holding portion 202 are arranged on the rear side of the control unit 76. The main body case 20 has a protrusion 230 that protrudes from the rear end of the motor storage portion 64 in the rearward direction. The first battery holding portion 200 is arranged on the upper wall 232 of the protrusion 230. The second battery holding portion 202 is arranged on the lower wall 234 of the protrusion 230. The first battery holding portion 200 and the second battery holding portion 202 are arranged along a surface including the front-back direction and the left-right direction. The installation direction of the first battery pack BP1 to the first battery holding portion 200 can be the front direction, the left direction, or the right direction. The installation direction of the second battery pack BP2 to the second battery holding portion 202 can be the front direction, the left direction, or the right direction.

[0189] (Variation Example)

[0190] The other end of the motor unit 4 according to one embodiment may be fixed to the base 12 .

[0191] In the electric pump 2 of one embodiment, at least one of the center 66a of the battery holding portion 66, the center 82a of the electric motor 82, the center 76a of the control unit 76, the center 186a of the grip 186, and the center of gravity G1 of the electric pump 2 may not be arranged on the first plane 96.

[0192] In the motor unit 4 of one embodiment, the adjustment cover 52 may be fixed to the right main body case 22 . The air intake cover 54 may be fixed to the left main body case 24 .

[0193] In the motor unit 4 of one embodiment, the adjustment wire 56 may extend from the adjustment cover 52 in the rear direction, in the upward direction, or in the downward direction.

Claims

1. An electric pump, wherein: The electric pump has: a motor unit; and a pump unit, which is driven by the motor unit and is capable of spraying water, The motor unit comprises: a main body case having a battery holding portion capable of holding a battery pack; and an electric motor housed in the main body housing and driving the pump unit, The battery pack can be used for the electric pump and equipment other than the electric pump.

2. The electric pump according to claim 1, wherein: The electric motor is a brushless motor having a stator and a rotor. The motor unit further comprises: a control unit, which is housed in the main body housing and drives the electric motor; and a fan that rotates integrally with the rotor, The fan generates an air flow for cooling the control unit inside the main body housing by rotating.

3. The electric pump according to claim 1 or 2, wherein: The motor unit is attachable to and detachable from the pump unit.

4. The electric pump according to any one of claims 1 to 3, wherein: One end of the motor unit is supported by the pump unit, The other end of the motor unit is a free end.

5. The electric pump according to any one of claims 1 to 4, wherein: The electric pump further includes a contact portion that is disposed on a lower side of the main body case and contacts the mounting surface when the electric pump is mounted on the mounting surface.

6. The electric pump according to claim 5, wherein: When the electric pump is placed on the placement surface, the battery holding portion is arranged above the electric motor.

7. The electric pump according to claim 5 or 6, wherein: The electric motor rotates about a central axis extending in the front-rear direction, In a left-right direction that is orthogonal to the front-rear direction and to a vertical direction that is orthogonal to the placement surface, the length of the main body housing is shorter than the length of the contact portion.

8. The electric pump according to claim 7, wherein: In the left-right direction, the length of the main body housing is shorter than the length of the pump unit.

9. The electric pump according to any one of claims 1 to 8, wherein: The electric pump further includes a handle, the handle being fixed to the pump unit and having a grip portion gripped by a user. The electric motor rotates about a central axis extending in the front-rear direction, In the front-rear direction, a distance between the center of gravity of the electric pump and the pump unit is greater than a distance between the center of gravity of the electric pump and the grip portion.

10. The electric pump according to any one of claims 1 to 9, wherein: The motor unit further includes a control unit, which is housed in the main body housing and drives the electric motor. When the electric pump is placed on the placement surface, the electric motor and the battery holding portion at least partially overlap when the electric pump is viewed in a vertical direction perpendicular to the placement surface.

11. The electric pump according to claim 10, wherein: When the electric pump is placed on the placement surface, the electric motor and the control unit at least partially overlap when the electric pump is viewed in the up-down direction.

12. The electric pump according to claim 10 or 11, wherein: The electric motor rotates about a central axis extending in the front-rear direction, In the left-right direction orthogonal to the front-rear direction and the up-down direction, the center of the battery holding portion and the center of the electric motor are arranged on a first plane.

13. The electric pump according to claim 12, wherein: In the left-right direction, the center of the control unit is arranged on the first plane.

14. The electric pump according to any one of claims 1 to 13, wherein: The pump unit has a spray port for spraying the water. The main body housing includes an upper wall on which the battery holding portion is arranged, and the upper wall is arranged below the discharge port when the electric pump is placed on a placement surface. The upper wall is inclined with respect to the mounting surface when the electric pump is mounted on the mounting surface.

15. The electric pump according to any one of claims 1 to 14, wherein: The battery holding portion holds the two battery packs.

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