JPH06249184A - Submergible pump - Google Patents

Abstract

PURPOSE:To provide a small-sized and lightweighted submergible pump by arranging an electrical part through a process of making use of the inner space of a stator casing of a submergible motor effectively. CONSTITUTION:In a submergible pump 1, a stator 7 of a submergible motor 9 composed of a stator 7 and a rotor 8 is housed in a stator casing 5 connected onto the pump casing 21 through an oil casing 4, and an impeller 22 is attached to a rotor shaft 10 protruded on the lower part of the oil casing 4. And the rotor shaft 10 is overhung by a double row bearing 11 of the oil casing 4, moreover a bracket 12 for positioning an electrical part like a condenser 13 into a space S surrounded by a stator coil 7a is provided on the upper end of the stator casing 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submersible pump for pumping a fluid such as waste water mixed with solid matter.

[0002]

2. Description of the Related Art In a conventional submersible pump a, as shown in FIG. 2, a rotor shaft c1 of a submersible motor d composed of a stator b and a rotor c is supported at two places, an upper bearing e and a lower bearing f.

The upper bearing e is a stator casing g.
Is attached to the bearing bracket i connected to the upper end of the lower bearing f, and the lower bearing f is attached to the oil casing j. b
1 is a stator coil.

A motor protection device k, a capacitor m and internal wiring (not shown) are installed on the bearing bracket i.

A tip of a cable q is connected to a motor cover p which is connected to the bearing bracket i and the end plate portion of the outer casing n. A hose coupling r and a carrying handle t are mounted on the outer casing n.

Reference numeral u is a shaft sealing device, and a strainer x is attached to a pump casing w accommodating the impeller v.

[0007]

However, in the above conventional submersible pump a, not only is there an idle space s between the upper bearing e and the stator coil b1, but also the motor protection device k is mounted on the bearing bracket i. Since the electric components such as the capacitor m and the internal wiring are installed, the height of the stator casing g and the motor cover p are both high.

Therefore, the total height h of the pump is increased and the total weight is also increased. Particularly, when a single-phase motor is applied, the space ratio occupied by the electric components is increased, and the submersible pump tends to be large and heavy. Becomes noticeable.

When the submersible pump a becomes large in size and increases in weight in this way, not only the product management cost and the transportation cost increase, but also the labor burden on the operator becomes large when carrying it at the work site. There was a problem.

In view of such conventional circumstances, it is an object of the present invention to provide a submersible pump in which the idle space s is effectively used to reduce the overall size and weight.

[0011]

In the submersible pump of the present invention, an oil casing is connected above a pump casing, and a stator of the submersible motor including a stator and a rotor is housed in a stator casing connected to the oil casing. A submersible pump in which an impeller is attached to a rotor shaft protruding downward from the oil casing, wherein the rotor shaft is cantilevered by a double-row bearing attached to the oil casing, and an upper end portion of the stator casing is provided. Is provided with a bracket for positioning an electric component such as a capacitor in a space surrounded by a stator coil.

[0012]

The rotor shaft is prevented from tilting due to the double-row bearing even if it receives a radial force, so that the stator and the rotor do not come into contact with each other.

Since the space surrounded by the stator coils is effectively used as the installation position of the condenser by the bracket, the total height of the pump is significantly shortened, and the submersible pump can be made compact and lightweight.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

The submersible pump 1 shown in FIG. 1 sucks a fluid such as waste water containing solid matter and pumps it, and comprises a motor section 2 and a pump section 3 directly connected to the motor section 2.

The motor unit 2 has an underwater motor 9 including a stator 7 and a rotor 8 inside which an oil casing 4, a stator casing 5 and a motor cover 6 are connected, a bracket 12, a capacitor 13, a motor protection device 14 and a cable 15 which will be described later. And internal wiring.

The rotor shaft 10 extending from the rotor 8 to the pump portion 3 is cantilevered by a double row bearing 11 such as a ball bearing attached to the oil casing 4.

A bracket 12 is provided on the upper end of the stator casing 5. This bracket 12 serves to position the capacitor 13 in the space S surrounded by the stator coil 7a, and the bracket 12 is connected to the upper end of the stator casing 5 and the capacitor receiver 12b is sunk to the rotor 8 side. 13 is fixed, and a motor protection device 14 is attached to the flange portion 12a. Further, internal wiring (not shown) is housed inside the bracket 12 and the motor cover 6.

A cable 15 is connected to the motor cover 6, and a space between the oil casing 4, the stator casing 5 and the motor cover 6 is provided between the upper surface of the motor cover 6 and the outer peripheral portion of the base portion 20 of the pump casing 21, which will be described later. The outer casing 16 for forming the flow path C is connected to.

Reference numeral 17 is a hose coupling, and 18 is a carrying handle.

The pump portion 3 is connected to the oil casing 4 so as to form an oil chamber 19, and the pump casing 2 is attached to the lower surface of a pump side bracket 20.
1 is connected, and the impeller 22 is attached to the pump casing 21.
Is housed. The impeller 22 is attached to the rotor shaft 10 protruding downward from the oil casing 4.

At the outer peripheral portions of the pump side bracket 20 and the pump casing 21, for example, three outlets P2 are provided.
Open at the flow path C of the outer casing 16 at equal intervals along the outer circumference. P1 is a suction port.

A shaft seal device 23 is arranged from the center lower end of the oil casing 4 to the center upper end of the pump side bracket 20, and an oil seal 24 is attached to the center lower end of the pump side bracket 20. 25 is a strainer.

Next, the operation of the above embodiment will be described.

When the impeller 22 rotates together with the rotor shaft 10 by starting the submersible motor 9, the fluid around the submersible pump 1 is sucked from the strainer 25 into the suction port P1 of the pump casing 21, and then added by the impeller 22. It is pressurized and sent from the discharge port P2 to a predetermined point via the flow path C and the hose coupling 17.

Even if the rotor shaft 10 receives a radial force during the pressure feeding operation, the rotor shaft 10 is prevented from being tilted by the double-row bearing 11. Therefore, the inner peripheral surface of the stator 7 and the rotor 8 are prevented. Contact with the outer peripheral surface of
There is no risk that the sliding surface of the shaft sealing device 23 will tilt. Therefore, the submersible pump 1 can continue stable operation.

Since the space S surrounded by the stator coil 7a is effectively used as the installation position of the capacitor 13 by the bracket 12, the height of the motor cover 6 is remarkably shortened.

This also shortens the height of the outer casing 16 which covers the upper surface of the motor cover 6 and is connected thereto. As a result, the submersible pump 1 becomes small and lightweight.

[0029]

In the submersible pump of the present invention, the stator of the submersible motor including the stator and the rotor is housed in the stator casing connected to the upper side of the pump casing via the oil casing, and the rotor shaft protruding downward from the oil casing. A submersible pump having an impeller attached to the rotor shaft, wherein the rotor shaft is cantilevered by a double-row bearing attached to an oil casing, and an electric component such as a condenser is provided on an upper end of the stator casing. Since the bracket for locating in the space surrounded by the coil is provided, the effective use of this space significantly shortens the total height of the pump as compared with the conventional pump.

Therefore, the submersible pump can be easily reduced in size and weight, so that the product management cost and the transportation cost can be reduced, and the labor burden on the operator can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a central vertical sectional view of a submersible pump.

FIG. 2 is a central vertical sectional view showing a conventional example of a submersible pump.

[Explanation of symbols]

 1 Submersible Pump 4 Oil Casing 5 Stator Casing 7 Stator 7a Stator Coil 8 Rotor 8a Side Edge 9 Underwater Motor 10 Rotor Shaft 10a Edge 11 Double Row Bearing 12 Bracket 13 Condenser 21 Pump Casing 22 Impeller S Space

Claims (1)

[Claims] 1. An oil casing is connected to an upper side of a pump casing, a stator of an underwater motor including a stator and a rotor is housed in a stator casing connected to the oil casing, and a rotor shaft protruding downward from the oil casing. A submersible pump to which an impeller is attached, wherein the rotor shaft is cantilevered by a double-row bearing attached to an oil casing, and an electric component such as a capacitor is attached to an upper end of the stator casing as a stator coil. A submersible pump characterized by being provided with a bracket for positioning in a space surrounded by.