JP3423456B2 - Motor casing for submersible pump - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a metal plate motor casing for a submersible pump.

[0002]

2. Description of the Related Art The use of a metal motor casing has been increasingly used recently because it allows the pump to be made lighter and smaller than a cast motor. However, since it is difficult to mold complicated shapes by pressing, the number of parts increases and more molds are required than in the case of casting, which increases mold manufacturing costs and welding and screw fixing. However, there is a problem in that the manufacturing cost is increased due to the watertight measures and the like, because the number of joints due to the increase in the number is large, especially in the motor casing for the submersible pump.

[0003]

An object of the present invention is to provide a metal plate motor casing for a submersible pump, which has a small number of parts, does not require a large number of molds, and has a small number of assembling steps. It is an object of the present invention to provide a casing structure that can be manufactured at low cost, since the number of joints due to the above is small, and the sealing portion that causes water infiltration is also small.

[0004]

In order to solve the above problems, according to the invention of claim 1, in a pump motor casing to be combined with an oil casing mounted on the pump casing, the motor casing is opposed to the motor from above and below. The pair of brackets, the outer cover fitted on the outer periphery of the bracket, and the cooling jacket mounted on the outer periphery of the bracket are made of metal plates, and the lower bracket made of the metal plate is provided at the center of the bottom wall of the ring body with the upper surface opened. An annular bearing pocket is recessed in the upper surface and a shaft hole is bored in the center of the pocket, the outer peripheral surface of the ring body is pressed against the inner peripheral surface of the outer cover, and the upper edge of the annular pocket is located near the lower surface of the motor stator. The lower edge is formed on the contact surface with the upper edge of the peripheral wall of the oil casing, and the upper bracket made of a metal plate is formed on the lower surface of the central portion of the upper wall of the annular body with the lower surface opened. Ring bear The outer peripheral surface of the ring body is pressed against the inner peripheral surface of the outer cover so that the lower edge portion is formed as the contact edge with the peripheral portion of the upper surface of the motor stator, and the upper edge portion is the outer portion. It is formed on the contact surface with the inwardly bent portion of the cover,
The outer cover made of a metal plate has an inwardly-arranged stepped portion provided above the cylindrical body whose lower surface is opened, and further has a storage space for electrical components thereabove. The cooling jacket made of a metal plate is formed on the fitting surface with the outer periphery of the casing, the lower end edge of which is formed on the abutting edge of the oil casing on the upper surface of the flange described later, and the cooling jacket made of a metal plate has a diameter larger than that of the outer cover. Of the outer cover is bent inwardly to form a contact edge on the outer surface of the outer side of the stepped portion of the outer cover, and the lower opening edge is bent outward to form a mounting seat on the upper surface of the flange of the oil casing (described later). And the oil casing is
A shaft hole is formed in the center of the bottom wall, and a joint flange is projected on the outer side of the peripheral wall to form the lower surface of the joint surface to the pump casing, and to connect the cooling chamber inside the cooling jacket and the inside of the pump casing. It has a structure in which water passage holes are formed.

According to the second aspect of the present invention, in the pump motor casing to be combined with the oil casing mounted on the rear side of the pump casing, a pair of brackets facing each other from the front and rear of the motor, an outer cover fitted to the outer periphery thereof, and The cooling jackets provided around the outer circumference are made of metal plates, respectively, and the front bracket made of metal plates has an annular bearing pocket recessed in the center of the front wall of the front wall of the ring body with the rear opening. The outer peripheral surface of the ring body is pressed into contact with the inner peripheral surface of the outer cover, and the rear edge is formed as the contact surface with the front peripheral portion of the motor stator, and the front edge is oil. The rear bracket made of a metal plate is formed on the contact surface with the rear edge of the casing peripheral wall, and the annular bearing pocket is recessed in the front surface of the central part of the rear wall of the ring body with the front opening, and the outer peripheral surface of the ring body is formed. But The front edge of the cover is pressed against the inner peripheral surface of the cover to form a contact surface with the peripheral portion of the rear surface of the motor stator, and the rear edge is formed with the contact surface of the outer cover with the inwardly bent step. The outer cover made of a metal plate is provided with an inwardly stepped portion at the rear of the cylindrical body having a front opening, and a storage space for electrical equipment is further retained at the rear of the cylindrical body, and the front surface of the inner peripheral surface of the cylindrical body is kept. One side is formed on the mating surface with the outer periphery of the oil casing, the front edge is formed on the edge of the oil casing that comes into contact with the upper surface of the flange described later, and the cooling jacket made of metal plate is formed with a larger diameter than the outer cover. The upper end opening edge of the formed cylindrical body is bent inwardly to form a contact edge with the outer surface of the stepped portion of the outer cover,
The lower end opening edge is bent outward to form a mounting seat on the upper surface of the flange of the oil casing which will be described later.The oil casing has a shaft hole bored in the center of the bottom wall and a joining flange protruding from the outside of the peripheral wall. Then, the lower surface thereof is formed as a joint surface to the pump casing, and a water passage hole is provided to connect the cooling chamber inside the cooling jacket and the inside of the pump casing.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The motor casing according to claim 1 is applied to a vertical submersible pump, and the motor casing according to claim 2 is applied to a horizontal submersible pump. The drawings of the embodiments show an example applied to a vertical submersible pump, which will be described below with reference to the drawings of the embodiments.

Reference numeral 1 is a pump casing, 2 is an oil casing mounted on the pump casing 1, and 3 is a motor casing connected to the oil casing 2.
An outer cover 5a made of a metal plate for housing the motor 4 and a cooling jacket 5 made of a metal plate provided around the outer cover 5a.
b, and a pair of metal plate brackets 6a and 6b for supporting the motor 4 from above and below in the outer cover 5a.
The lower bracket 6a made of a metal plate has an annular bearing pocket 7a recessed in the upper surface of the central portion of the bottom wall 10 of the ring body having an upper surface opening, and a shaft hole 8a formed in the center thereof to form an outer periphery of the ring body. The surface 9 is pressed against the inner peripheral surface 11 of the outer cover 5a, and its upper edge portion 9a is formed as a contact edge with the peripheral portion of the motor stator lower surface 4a, and the lower edge portion 10a is the upper edge of the peripheral wall of the oil casing 2. It is formed at the contact edge with 2a. The upper bracket 6b made of a metal plate has an annular bearing pocket 7b recessed in the lower surface of the central portion of the upper wall 10 of the annular body whose lower surface is opened, and a through hole 8b is bored in the central portion thereof to form an outer peripheral surface of the annular body. 9 is pressed against the inner peripheral surface 11 of the outer cover 5a so that its lower edge portion 9b is formed as a contact edge with the peripheral portion of the motor stator upper surface 4b, and the upper edge portion 10b of the outer cover 5a is inwardly bent. It is formed on the contact surface with the step portion 11b. The metal plate outer cover 5a is provided with an inwardly bent stepped portion 11b above the cylindrical body whose lower surface is opened, and the upper portion thereof is formed in the accommodation space 12 for electrical equipment. Reference numeral 11c is formed so as to fit with the outer peripheral surface 2c of the peripheral wall of the oil casing 2 and has a lower end edge 1
1d is formed on a contact edge of the oil casing 2 with a flange 20 described later. The cooling jacket 5b made of a metal plate has an upper end opening edge 19 of a cylindrical body formed to have a diameter larger than that of the outer cover 5a, and bends the upper end opening edge 19 inward to a small diameter to form an outer surface 1 of the step portion of the outer cover 5a.
The lower opening edge is formed on the abutting edge of the oil casing 1a and is bent outward to form a mounting seat 13 on the flange 20 of the oil casing 2. Oil casing 2
Has a shaft hole 2e formed in the center of its bottom wall 2d and a joining flange 20 projecting from the outer side of the peripheral wall to form the lower surface thereof as a joining surface to the pump casing 1, and the cooling jacket 5
A water passage hole 22 that connects the inside of the cooling chamber 21 with the inside of the pump casing 1 is formed. 14 is an outer cover 5a
An electric wire outlet provided on the upper wall 15 and a handle 16 installed on the upper wall 15.

During assembly, the upper bearing 17b of the motor shaft 4c is replaced with the bearing pocket 7b of the upper bracket 6b.
The motor 4 with the lower bearing 17a pressed into the bearing pocket 7a of the lower bracket 6a, and the electrical components (not shown) such as a protector and a condenser set above the upper bracket 6b. The outer cover 5a is press-fitted into the inner bent step portion 11b.
Is brought into contact with the upper edge portion 10b of the upper bracket 6b, and the motor shaft 4c guided from the shaft hole 8a is provided with a shaft sealing device to the lower portion 11c of the inner peripheral surface of the outer cover 5a.
The outer peripheral surface 2c of the lower bracket 6a, the lower edge portion 10a of the lower bracket 6a is pressed against the upper edge 2a of the peripheral wall of the oil casing 2 via an O-ring, and the cooling jacket 5b is fitted from above the outer cover 5a. The upper end opening edge 19 is brought into contact with the stepped portion outer upper surface 11a of the outer cover 5a via an O-ring, and the lower end edge 11d of the cylindrical body is brought into contact with the joining flange 20 of the oil casing 2 via an O-ring. By fixing screws from the mounting seat 13 to the oil casing 2, the upper peripheral portion 4b of the motor stator is pressed against the lower edge 9b of the upper bracket 6b and the upper edge of the lower bracket 6a. 9a is in pressure contact with the lower surface peripheral portion 4a of the motor stator, the motor 4 is configured in the outer cover 5a, and the tip of the motor shaft 4c is the central shaft hole 2 of the oil casing bottom wall 2d. And protrudes from. After that, like the conventional submersible pump, the impeller 18 is fitted to the tip of the protruding motor shaft 4c, and then the oil casing 2 is polymerized and fixed on the pump casing 1, whereby the motor 4 is connected. As a result, a submersible pump having the cooling chamber 21 on the outer circumference of the outer cover 5a is configured. Although the through hole 8b of the upper bracket 6b does not affect the function of the motor, the through hole 8b can be a common component with the lower bracket 6a by having the through hole 8b.

[0009]

According to the present invention, the constituent parts of the motor casing are in a shape that can be easily pressed, and there are no joints by screwing or welding on each part, which is excellent in workability and the number of parts. This reduces the number of molds and reduces the number of assembly steps. Since the outer cover 5a made of a metal plate is press-fitted into the motor 4 sandwiched by the upper and lower brackets 6a, 6b made of a metal plate, the seamless structure is excellent in watertightness and no special measures against watertightness are required. The parts requiring the interposition of the O-rings are also limited, and the screw fixing points at the time of assembly are only the fixing portions of the cooling jacket 5b and the oil casing 2, and there are no other screw fixing points. There is an advantage that a pump casing excellent in workability and excellent in water tightness for a submersible pump can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an upper bracket in a motor casing of the present invention.

FIG. 2 is a vertical sectional side view of a motor supported by the motor casing of the present invention.

FIG. 3 is a vertical sectional side view of a lower bracket in the motor casing of the present invention.

FIG. 4 is a vertical sectional side view of an outer cover of the motor casing of the present invention.

FIG. 5 is a vertical cross-sectional side view illustrating an assembling procedure of a motor by the motor casing of the present invention, showing a state in which the motor is clamped by upper and lower brackets.

FIG. 6 is a vertical cross-sectional side view illustrating an assembling procedure of a motor by the motor casing of the present invention, showing a state in which an outer cover is press-fitted into the motor sandwiched by upper and lower brackets.

FIG. 7 is a vertical cross-sectional side view of an oil casing fitted to a lower portion of an inner peripheral surface of an outer cover in the motor casing of the present invention.

FIG. 8 is a vertical cross-sectional side view illustrating an assembling procedure of a motor by the motor casing of the present invention, showing a state where the outer peripheral surface of the oil casing is fitted to the lower portion of the inner peripheral surface of the outer cover.

FIG. 9 is a vertical sectional side view of a cooling jacket in the motor casing of the present invention.

FIG. 10 is a vertical cross-sectional side view illustrating an assembling procedure of a motor by the motor casing of the present invention, showing a state in which an impeller is fitted to a motor shaft tip protruding from a central shaft hole of an oil casing bottom wall.

FIG. 11 is a vertical cross-sectional side view of a submersible pump configured by connecting a motor incorporated in a motor casing of the present invention onto a pump casing.

[Explanation of symbols]

1 pump casing 2 oil casing 2a Upper edge of peripheral wall of oil casing 2c Oil casing outer peripheral surface 2d oil casing bottom wall 2e Shaft hole 4 motor 4a Peripheral area under the motor stator 4b Peripheral part of the upper surface of the motor stator 5a Metal plate outer cover 5b cooling jacket 6a Lower bracket made of metal plate 6b Metal plate top bracket 7a Bearing pocket 7b bearing pocket 8a shaft hole 9a Upper edge of outer peripheral surface of lower bracket 9b Lower edge of outer peripheral surface of upper bracket 10a Lower edge of outer peripheral surface of lower bracket 10b Upper edge of outer peripheral surface of upper bracket 11 Inner peripheral surface of outer cover 11a Step outer surface 11b Inner bent step 11c Lower part of inner peripheral surface of outer cover 11d Lower edge of outer cover 12 Storage space for electrical components 13 Mounting seat 19 Upper opening edge of cooling jacket 20 flange 21 Cooling chamber 22 Water holes

Claims (2)

(57) [Claims] 1. A motor casing for a pump to be combined with an oil casing mounted on a pump casing, wherein a pair of brackets facing each other from above and below the motor, an outer cover fitted to the outer periphery thereof, and an outer cover fitted to the outer cover. The cooling jacket is made of metal plate, and the lower bracket made of metal plate has a ring-shaped bearing pocket recessed in the upper surface of the center of the bottom wall of the ring body with the upper surface opening and a shaft hole in the center. , The outer peripheral surface of the ring body is pressed against the inner peripheral surface of the outer cover, and the upper edge portion thereof is formed as a contact edge with the peripheral portion of the lower surface of the motor stator, and the lower edge portion contacts the upper edge of the oil casing peripheral wall. The upper bracket made of a metal plate is formed on the contact surface, and an annular bearing pocket is recessed in the lower surface of the center of the upper wall of the ring body that opens on the lower surface, and the outer peripheral surface of the ring body is the inner peripheral surface of the outer cover. Press it The lower edge portion is formed on the contact edge with the peripheral portion of the upper surface of the motor stator, and the upper edge portion is formed on the contact surface with the inward bending step portion, which will be described later, of the outer cover. , An inwardly stepped step is provided above the cylindrical body opened on the lower surface, and a storage space for electrical components is further retained above the cylindrical step, and the lower portion of the inner peripheral surface of the cylindrical body is a fitting surface with the outer periphery of the oil casing. The lower edge of the oil casing is formed on the upper edge of the flange of the oil casing, and the cooling jacket made of metal plate has a smaller diameter than the upper opening edge of the cylindrical body that is larger in diameter than the outer cover. The outer cover is bent inwardly to form a contact edge on the upper surface of the outer side of the step portion, and the lower end opening edge is bent outward to form a mounting seat on the upper surface of the flange of the oil casing described later. , A shaft hole is formed in the center of the bottom wall, and a connecting A bottom surface of the underside of the pump casing, the bottom surface of which is formed as a joint surface with the pump casing, and a water passage hole is formed between the cooling chamber inside the cooling jacket and the inside of the pump casing. Motor casing for pumps. 2. A pump motor casing to be connected to an oil casing mounted at the rear of the pump casing, comprising a pair of brackets facing each other from the front and rear of the motor.
The outer cover fitted on the outer periphery and the cooling jacket provided on the outer periphery are made of metal plates, respectively, and the front bracket made of a metal plate has an annular shape on the rear surface of the central portion of the front wall of the ring body having the rear opening. The bearing pocket is recessed, and a shaft hole is bored in the center of the bearing pocket.The outer peripheral surface of the ring body is pressed against the inner peripheral surface of the outer cover, and the rear edge of the bearing pocket is the contact surface with the peripheral portion of the front surface of the motor stator. The front edge is formed on the contact surface with the rear edge of the peripheral wall of the oil casing, and the rear bracket made of a metal plate has an annular bearing pocket on the front surface of the center of the rear wall of the annular body with the front opening. The outer peripheral surface of the ring body is press-fitted with the inner peripheral surface of the outer cover so that its front edge portion is formed as a contact surface with the rear peripheral portion of the motor stator. The outer cover made of metal plate is formed on the contact surface with the inwardly bent step, and the front opening An inwardly-arranged stepped portion is provided at the rear of the cylindrical body, and a storage space for electrical components is further retained behind the cylindrical portion, and the front portion of the inner peripheral surface of the cylindrical body is formed on the fitting surface with the outer periphery of the oil casing. The front edge is formed on the edge of the oil casing that comes into contact with the upper surface of the flange described later, and the cooling jacket made of metal plate is bent inwardly at the upper end opening edge of the cylinder formed to have a larger diameter than the outer cover. The outer cover is formed at the contact edge on the upper surface of the step outer side, and the lower end opening edge is bent outward to form a mounting seat on the upper surface of the flange of the oil casing described later. A shaft hole is bored in the center of the pump and a joint flange is projected on the outer side of the peripheral wall to form the lower surface of the joint surface to the pump casing, and to connect the cooling chamber inside the cooling jacket and the inside of the pump casing. Make sure there are water holes Wherein the motor casing submersible pump.