JP2545927Y2 - Single-phase induction electric 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 single-phase induction motor type pump, and more particularly to a combination of a pump and a single-phase induction motor.

[0002]

2. Description of the Related Art A conventional electric pump driven by an electric motor has a narrow gap between the impeller I and the liner ring R, as shown in FIG.
As shown in FIG. 3, a narrow portion is formed between the impeller I and the suction cover SC opposed thereto, and rust and sand contained in water enter the narrow portion and adhere to the pump. A large starting torque was required for the electric motor to be driven.

In particular, a single-phase induction motor mainly used for this type of pump incorporates a starting capacitor CS as shown in FIG. 6 in order to increase the starting torque, and after starting, the voltage applied to the capacitor is reduced. There is a drawback that a centrifugal switch S must be built in to cancel the operation. FIG. 7 shows a connection diagram of a phase-separated starting type in which the starting torque is relatively large similarly to FIG. 6, and in both figures, MC is the main coil, AC is the auxiliary coil, PT is the protector, and PL is
Is a plug.

Further, this type of pump is portable and uses a large number of engine generators and the like as a power source, and when the engine is throttled, that is, when operated at a low voltage and a low frequency, the centrifugal force switch S is not turned off. Voltage is continuously applied to the starting capacitor CS.
There is a defect that the contact of the centrifugal force switch S causes a rip ring phenomenon and is damaged early.

[0005]

In such a capacitor-operated single-phase induction motor, although a low starting torque of the pump is a prerequisite, a low starting torque that can be started by a conventional pump is obtained. Had not been done.

In general, various vortex pumps are known and are suitable for handling wastewater and soft foreign matter such as textiles. A vortex pump is disclosed in, for example, JP-A-57-157095. In such a known technique, the distance between the pump casing and the impeller is reduced so as to minimize the possibility of sewage from entering the back of the impeller. However, foreign matter such as dirt also enters the oil seal provided at a portion penetrating the casing. Therefore, when a capacitor-operated single-phase induction motor was used, the starting torque was insufficient and the motor could not be started.

[0007] Accordingly, an object of the present invention is to provide a single-phase induction motor which is compact and can be used because a capacitor motor having a small starting torque can be used without adhering foreign substances such as rust, sand and scale. To provide a conductive pump.

[0008]

According to the present invention, a vortex pump 1 and a single-phase induction motor 6 are provided. The front surface of an impeller 4 of the vortex pump 1 has a gap between the pump casing 2 and the impeller. To form a volute chamber, and the back surface of the impeller 4 is provided with a gap between the casing and the casing cover 3 so that foreign matter such as sand does not enter and adhere thereto.
The electric motor 6 is provided in an electric motor frame 8 provided on the casing cover 3, and an electric motor cover 10 is provided on the upper part of the electric motor frame 8.
A driving capacitor 13 is provided therein, and a handle 15 for transport is provided on the motor cover 10, and a drive shaft 9 of the motor 6 extends through the casing cover 3 via a mechanical seal 5. To the impeller 4.

[0009]

Therefore, sewage can enter and flow out of the space between the backs of the impellers. Therefore, foreign matters such as rust, sand, and scale do not adhere to the impeller and the pump casing and the like around the impeller, and the attached foreign matter does not increase the starting torque.

[0010] Further, since the mechanical seal is provided on the side of the casing cover opposite to the impeller, there is very little possibility that foreign matter such as dirt enters the mechanical seal. As a result, there is no need for an element such as a liner ring or a wear ring that reduces the gap between the impeller and the pump casing, so that the number of parts can be reduced and the weight can be reduced. Then, a capacitor-operated motor having a small starting torque can be used as the motor. Since the capacitor is housed in the electric cover, it can be made compact as a whole, and because it is compact, it can be configured to be portable by the handle and portable. Therefore, it can be suitably implemented for the maintenance of construction drainage or septic tanks.

As described above, according to the present invention, (1) the distance between the front surface of the impeller and the pump casing is widened, and (2) the distance between the rear surface of the impeller and the casing cover is wide. In addition, a condenser-operated single-phase induction motor can be used, a centrifugal switch can be omitted, and failures can be reduced as a whole. Further, it is possible to operate at a low voltage and a low frequency so that when an engine generator or the like is used as a power source, the engine throttle can be throttled as necessary to save fuel.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a portable submersible pump embodying the present invention, which comprises a vortex pump (hereinafter referred to as a pump) 1 and a single-phase induction motor (hereinafter referred to as an electric motor) 6.

The impeller 4 of the pump 1 is provided with a space between the front surface and the pump casing 2, and a relatively wide space is provided between the back surface and the casing cover 3. The portion of the casing cover 3 facing the impeller 4 is not provided with a liner ring or a wear ring in a conventional pump. The pump casing 2 is provided with a volute chamber V in which the front surface of the impeller 4 is widely opened to form a vortex flow of water.

The electric motor 6 is housed in an electric motor frame 8 erected on the casing cover 3, and a drive shaft 9 arranged in an upright shape penetrates the casing cover 3 and is connected to the impeller 4. Water tightness is achieved by a mechanical seal 5 provided on the casing cover 3.

An electric motor cover 10 is provided on the electric motor frame 8, and an operation capacitor 14 is provided through a protective member 13 in a chamber 12 defined by a partition plate 11. The motor handle 10 has a handle 1 for transportation.
5 and a cable 16 are further provided. In the drawing, 17 is a suction port, and 18 is a discharge port.

In the illustrated example, two operating capacitors 14 are provided, and are connected as shown in the connection diagram of FIG.

During operation, a vortex is generated in the volute chamber V by the rotation of the impeller 4 to draw water from the suction port 17 and discharge it from the discharge port 18. Because it decreases
The portion of the casing cover 3 facing the impeller 4 includes:
Conventional pumps do not require liner or wear rings.

Further, since there is a wide space between the impeller 4 and the pump casing 2 and the casing cover 3, rust, sand, scale, etc. do not adhere during operation, and the starting torque is reduced. Can be. Therefore, the centrifugal force switch S in the capacitor start type can be omitted by using the capacitor operation type single-phase induction motor 6 having a small starting torque, and failures can be reduced as a whole. Furthermore, since operation is possible even at a low voltage and a low frequency, when the cable 16 is connected to an engine generator and operated, the engine throttle can be throttled as necessary to save fuel. Further, since the operation condenser 14 is housed in the motor cover 10 and the handle 15 is provided, a compact portable submersible pump can be provided.

[0019]

[Effect of the Invention] As described above, according to the present invention, the following excellent effects can be obtained. (1) No foreign matter such as sand or dirt adheres to the impeller and the pump casing around the impeller, so that the starting torque does not increase. (2) Foreign matter such as sand and dirt hardly flows into the mechanical seal. (3) Therefore, a capacitor-operated single-phase induction motor having a relatively small starting torque can be used, and a failure can be reduced as a whole by omitting a centrifugal switch. (4) Since the pump can be made compact and can be made portable using the handle, it is convenient to move and handle the pump during maintenance and management of construction drainage and septic tanks. (5) Low voltage and low frequency operation can be performed, and power can be saved.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a connection diagram of a condenser operation type motor.

FIG. 4 is a side sectional view of a conventional single-phase induction motor type pump of a capacitor start type.

FIG. 5 is a side sectional view of a conventional condenser-starting single-phase induction electric pump.

FIG. 6 is a wiring diagram of a capacitor start type electric motor.

FIG. 7 is a wiring diagram of a phase-separated start type electric motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vortex pump 2 Pump casing 3 Casing cover 4 Impeller 5 Mechanical seal 6 Capacitor operation type single-phase induction motor 9 Drive shaft 10 Motor cover 14 Operation capacitor 15 Handle

Continuation of the front page (56) References JP-A-59-165891 (JP, A) JP-A-57-195886 (JP, A) JP-A-61-101691 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A vortex pump 1 and a single-phase induction motor 6, and a front surface of an impeller 4 of the vortex pump 1 forms a volute chamber with a space between the impeller 4 and a pump casing 2. The back surface of the impeller 4 is provided with a gap between the casing cover 3 and a foreign substance such as sand that does not enter and adhere thereto. The electric motor 6 is provided in an electric motor frame 8 provided on the casing cover 3. An electric motor cover 10 is provided on the upper part,
A driving capacitor 13 is provided in the motor cover 10, and a handle 15 for transportation is provided in the motor cover 10. The drive shaft 9 of the motor 6 is connected to the casing cover 3 via a mechanical seal 5. A condenser-operated single-phase induction motor-driven pump extending through and connected to the impeller 4.