JP3239178B2 - underwater pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submersible pump used for simple water supply and drainage at civil engineering sites and construction sites, or for water supply and drainage in agriculture and homes. It also relates to a submersible pump that can be safely driven without damage.

[0002]

2. Description of the Related Art A submersible pump used for simple water supply / drainage at a construction site or at home has an electric motor inside, and the electric motor is driven to rotate a rotating blade so that fluid is supplied. The fluid sucked inside and discharged inside is discharged to the outside. The electric motor built in the submersible pump is usually manufactured to be driven by a rated voltage. The rated voltage corresponds to a voltage value supplied in a region where the device is used. However, submersible pumps are sometimes used in areas with different supply voltage values because of their ease of transportation. If a submersible pump manufactured in an area where the rated voltage and the supply voltage are different, for example, a Japanese-made submersible pump in accordance with the rated voltage, may be damaged.

[0003] The electric motor provided inside the submersible pump is:
A plurality of tap terminals for changing the connection of the coil are provided. Lead wires are connected to these tap terminals, and each lead wire is connected to a terminal supported by the terminal block. The terminal block is arranged in the casing of the submersible pump so that it can be operated from the outside. When the supply voltage value changes, the lead wires are removed from the terminals of the terminal block, desired leads are connected, and the connection of the electric motor is changed.

[0004]

As described above, when the supply voltage value changes, the connection between the terminal supported by the terminal block and the lead wire is changed in order to change the connection of the coil in the motor. Must be changed, which is very troublesome. And because this task is so complicated,
There is a risk that lead wires may be connected incorrectly.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a simple operation for preventing the motor from being damaged even when the voltage supplied to the motor changes. An object of the present invention is to provide a submersible pump capable of achieving a desired connection state.

[0006]

According to the present invention, there is provided a submersible pump for sucking and discharging a fluid by driving a built-in electric motor, the pump being connected to a power supply terminal and a tap terminal of the electric motor, respectively. A terminal base on which the terminals are supported, and a switching member detachable from the terminal base and provided with a conductive member that electrically connects predetermined terminals when mounted on the terminal base; The connection state of the terminals by the conductive member is changed by attaching the switching member to the terminal block in a different manner.

[0007]

In the submersible pump of the present invention, when the rated voltage is supplied to the motor, the switching member is mounted on the terminal block in a predetermined state, and the predetermined terminals of the tap terminals of the motor are switched. The members are connected by a conductive member provided to the members, and are brought into a predetermined connection state. When a voltage different from the rated voltage is supplied, the switching member is mounted on the terminal block in a different manner from when the rated voltage is supplied. As a result, the connection state of the tap terminal of the motor is changed, and the motor is driven without any problem even with a voltage different from the rated voltage.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a submersible pump of the present invention. This submersible pump has a rated voltage of 230 volts and can be driven by a supply voltage of 460 volts. As shown in FIG. 1, the submersible pump of the present invention includes an electric motor 20 coaxially arranged in a cylindrical casing 11, and a rotating blade 31 attached to a rotating shaft 21 of the electric motor 20. . Electric motor 20
Has a cylindrical motor housing 24, and the fluid passage 12 is formed between the motor housing 24 and the casing 11. The rotating shaft 21 of the electric motor 20 passes through the axis of the electric motor housing 24,
1, a rotor 22 disposed inside a stator 23 is attached. The rotor 22 has a coil 22b wound around an iron core 22a, and the stator 23 also has a coil 23b wound around an iron core 23a. The stator 23 is disposed in the motor housing 24,
The rotating shaft 21 is rotatably supported by the motor housing 24.

The rotating shaft 21 extends downward from the motor housing 24, and a rotating blade 31 is attached to a lower end thereof. A partition 32 supported by the casing 11 is provided below the rotating blade 31. The partition 32 has a portion facing the rotating blade 31 and a rotating blade 3.
1 and in the vicinity of the rotary blade 31, and a suction port 33 is provided at the center thereof. Partition part 3
2, a suction chamber 14 for a fluid whose periphery is covered by a lower end of the casing 11 is provided. At a lower end of the casing 11 surrounding the suction chamber 14, the fluid enters the suction chamber 14. A large number of through-holes are formed to obtain.

Above the motor 20, a fluid passage 12 formed between the casing 11 and the motor housing 24 is provided.
The discharge pipe part 15 which is connected to this is arrange | positioned. Discharge pipe part 1
Reference numeral 5 extends upward, and an appropriate discharge pipe is connected to the discharge pipe section 15.

An electric motor 2 is provided beside the discharge pipe section 15.
A wiring chamber 16 communicating with the motor housing 24 is provided. The wiring chamber 16 is covered by a cover 17, and a power cable 50 for supplying power to the electric motor 20 is attached to the cover 17.
The power cable 50 has three power supply lines 51. In the wiring chamber 16, a terminal block 40 supporting each of the terminals 41 of the nine lead wires 42 connected to the electric motor 20 is supported in a horizontal state. The terminal block 40 has a preset terminal. A switching plate 60 for electrically connecting the members 41 is detachably mounted. Switching plate 6
Numerals 0 are attached to the terminal block 40 in different modes, and in each mode, the terminal 41 to be connected is changed. Each terminal 41 on the terminal block 40
Are connected to a power supply terminal of the coil 23b and a terminal for tapping in the stator 23 of the electric motor 20 via a lead wire 42, respectively. Switching plate 60
The connection state of the coil 23b in the stator 23 of the electric motor 20 is changed by changing the state of attachment to the terminal block 40.

The electric motor 20 is supplied with power from the power supply lines 51 of the power cable 50 to the coils 23b of the stator 23 of the electric motor 20 through the terminals 41 of the terminal block 40, so that the rotating shaft 21 is driven to rotate. Thereby, the rotating blade 31 attached to the lower end of the rotating shaft 21
Is rotated, and the fluid flows into the suction chamber 14 through the lower end of the casing 11. The fluid that has flowed into the suction chamber 14 enters the fluid passage 12 through the suction port 33 provided in the partition 32, and flows through the fluid passage 12. The fluid flowing through the fluid passage 12 is discharged to the discharge pipe 15 and discharged from the discharge pipe 15 to the outside.

FIG. 2A is a sectional view of the terminal block 40 in a state where the switching plate 60 is mounted, FIG. 2B is a plan view of the terminal block 40, and FIG. It is.

The nine terminals 41 supported by the terminal block 40
As shown in FIG. 2A, a conductive bolt 41a that penetrates the terminal block 40 is screwed to each of the bolts 41a on the upper and lower sides of the terminal block 40, and the bolt 41a is connected to the terminal block 40. It has a pair of nuts 41b and 41b to be fixed. As shown in FIG. 2B, the bolts 41a are arranged in three rows and three columns, and are arranged at equal intervals in the column direction, but have different intervals between rows in the row direction. . Each of the bolts 41 a extends long above the terminal block 40.

The electric motor 2 is connected to the bolt 41a of each terminal 41.
Nine lead wires 42 for energizing the coil 23b of the stator 23 at 0 are connected by nuts 41b. On the upper surface of the terminal block 40, two ribs 44 and 44 extending along the respective bolts 41a arranged in the row direction are arranged between the respective bolts 41a. In the figure, ribs 46 extending in the same direction are arranged in four rows. On the upper and lower surfaces of the terminal block 40, bolts 41 arranged along the row direction are provided.
two ribs 45 and 45 respectively extending along
Are arranged between the bolts 41a.

Three power supply lines 5 in the power cable 50
Numeral 1 is connected to each of the bolts 41a of the three outer terminals 41 arranged along the row direction of the terminal block 40 by an upper nut 41b and another nut.

As shown in FIG. 2C, the switching plate 60 has nine through-holes 61 arranged in an aligned manner in three rows and three columns, similarly to the arrangement of the terminals 41 on the terminal block 40. ing. Each of the through holes 61 is configured such that each of the bolts 41a can be inserted therethrough. Switching plate 6
0 means that each through hole 61 is aligned with each bolt 41a of each terminal 41 of the terminal block 40,
a is inserted into the terminal block 40, and the power cable 50 of the power cable 50 in the terminal block 40 is disengaged in the row direction so that one row of the bolts 41a connected thereto is disengaged. The six bolts 41 except for this one row of bolts 41a are shifted.
a is inserted into the corresponding through-hole 61, so that it is mounted on the terminal block 40.

On the upper surface of the switching plate 60, a row of through holes 61 into which the bolts 41a to which the power supply lines 51 of the power cable 50 are connected are inserted, and through holes 61 adjacent in the row direction. And three conductive pieces 62 electrically connected to each other. In addition, each conductive piece 6
One row of through holes 61 along the row direction where no 2 is provided
These are also electrically connected by one conductive piece 63 provided on the upper surface of the switching plate 60. Two ribs 65 extending along each conductive piece 62 are arranged between each conductive piece 62, and a conductive piece is provided between these conductive pieces 62 and the other conductive piece 63. One rib 66 extending along 63 is provided.

The submersible pump having such a configuration is constructed by the electric motor 2
It is possible to cope with a case where a voltage having a voltage value different from the rated voltage is supplied to 0. For example, the motor 20
When a rated voltage of 230 V is supplied to the terminal block 40, the switching plate 60 is mounted on the terminal block
Attached to. On the other hand, different from the rated voltage 46
When a high voltage of 0 V is supplied to the electric motor 20, the switching plate 60 is provided so that the row of bolts 41 a to which the power supply line 51 in the terminal block 40 is connected is not inserted into any of the through holes 61. The terminal is mounted on the terminal block 40 with the bolts shifted.

FIG. 3A shows that when the rated voltage is supplied to the motor 20, all the bolts 41a of the terminal block 40 are inserted into all the through holes 61 of the switching plate 60, and the switching plate 60 is FIG. 3B is a schematic diagram showing a relationship between each terminal of the motor 20 and the conductive pieces 62 and 63 of the switching plate 60 in a state where the motor 20 is mounted on the table 40. FIG. 3B is a connection diagram of the motor 20 in that state. As shown in FIG. 3A, each terminal 41 provided on the terminal block 40 is connected to a power supply terminal and a tap terminal of the coil 23 b in the stator 23 of the electric motor 20. The terminals of the coil 23b are connected to (U1, U3, U2), (V) from the column side of the bolt 41a to which each power supply line 51 of the power cable 50 is connected for each row.
1, V3, V2) and (W1, W3, W2), the terminals U1, V1, W1 are connected to the respective power supply lines 51 of the power cable 50.
(Each of which is R, S, T). Other terminals are tap terminals for changing the connection of the coil 23b. And
The power supply terminals U1, V1, and W1 and the tap terminals U3, V3, and W3 are electrically connected to each other by the conductive pieces 62 of the switching plate 60 mounted on the terminal block 40, respectively. With the conductive piece 63, the tap terminals U2, V2, and W2 are electrically connected to each other. As a result, as shown in FIG. 3B, the currents supplied from the power supply lines R, S, and T of the power cable 50 are the terminals U1 and U3, V1 and V3, W1 and W3 of the coil 23b in the stator 23. , Supplied to each.

FIG. 4A shows the switching plate 6 when the motor 20 is supplied with a high voltage different from the rated voltage.
FIG. 4 is a cross-sectional view showing a state where 0 is mounted on the terminal block 40;
(B) shows each terminal of the motor 20 and the plate 6 in that case.
FIG. 4C is a schematic diagram showing a relationship between the conductive pieces 62 and 63 of FIG. 0, and FIG. 4C is a connection diagram of the electric motor 20 in that state.

The switching plate 60 is mounted on the terminal block 40 in such a manner that the bolts 41a of the terminal block 40 to which the feeder lines 51 are connected are not inserted into the through holes 61, but are shifted by the bolt rows. Power supply terminal U in the coil 23b of the stator 23.
Only the currents supplied by the power supply lines R, S, and T are supplied to only 1, V1, and W1. And a terminal U2 for tapping
And U3, V2 and V3, and W2 and W3 are electrically connected by the respective conductive pieces 62 of the switching plate 60.

As described above, only by changing the mounting state of the switching plate 60 with respect to the terminal block 40,
In any case where the low voltage and the high voltage are supplied to the motor, the electric motor 20 is reliably rotated without burning out.

In the above embodiment, the switching plate mounted with the through-hole 61 through which the bolt 41a passes is used as the switching member mounted on the terminal block 40. However, the present invention has such a configuration. However, for example, as shown in FIGS.
A switching socket 70 provided with a concave portion 71 into which a can be fitted may be used. In order to electrically connect the desired concave portions 71 to each other, the inner peripheral surfaces of the desired concave portions 71 are electrically connected to each other by the conductive pieces 72 and 73. Connected.

[0025]

As described above, the submersible pump according to the present invention can operate the electric motor with a voltage different from the rated voltage only by changing the mounting state of the switching member to the terminal block on which each terminal of the electric motor is supported. Can be used without damage.

[Brief description of the drawings]

FIG. 1 is a sectional view of a submersible pump of the present invention.

2A is a sectional view of a state in which a switching plate is mounted on a terminal block provided in the submersible pump, FIG. 2B is a plan view of the terminal block, and FIG. 2C is a plan view of the switching plate. is there.

FIG. 3A is a schematic diagram showing a relation between a terminal block on which a switching plate is mounted, each terminal of the motor, and a conductive piece of the switching plate, and FIG. 3B is a connection diagram of the motor in that case.

FIG. 4A is a cross-sectional view of a terminal block on which a switching plate mounted in a different manner with respect to the terminal block is mounted;
(B) is a schematic diagram showing the relationship between the terminal block in this state, each terminal of the motor, and the conductive piece of the switching plate, and (c) is a connection diagram of the motor in that case.

FIG. 5A is a cross-sectional view of a terminal block provided with a switching socket used in place of the switching plate, and FIG.
FIG. 4 is a sectional view of a terminal block in which the switching socket is mounted in a different manner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Casing 20 Electric motor 21 Rotating shaft 22 Rotor 23 Stator 31 Rotating blade 40 Terminal block 41 Terminal 41a Bolt 42 Lead wire 51 Feeding line 60 Switching plate 61 Through hole 62 Conductive piece 63 Conductive piece

Claims (1)

(57) [Claims] 1. A submersible pump that sucks and discharges a fluid by driving a built-in electric motor, wherein a terminal connected to a power supply terminal and a terminal connected to a tap terminal of the electric motor is supported. A cutting member provided with a conductive member that is detachable from the terminal block and electrically connects predetermined terminals when mounted on the terminal block.
And a switching member.
The terminals are connected by conductive members
A submersible pump characterized in that a connection state is changed .