JP2001355591A - Dry submerged motor equipped with inverter and submerged motor pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dry submerged motor and a submerged motor pump for lengthening the life of a bearing by efficiently cooling and removing heat generated by a bearing on the counter-load side of the dry submerged motor pump and an interior inverter circuit part capable of being easily assembled and having a simple structure, and for cooling generated heat of the interior inverter circuit part. SOLUTION: A head cover attaching bracket 8 is integrally provided on a main bracket 3 having a bearing fitting support part 4 to be fixed to the counter-output shaft side of a submerged motor 1 through cooling water passage forming connecting parts 7a, 7b. A head cover 10 is fixed to the head cover attaching bracket 8 by bolts, and a frame 6 of the submerged motor 1 is fixed to the main bracket 3 by bolts. An interior inverter circuit part 11 is mounted in the head cover 10, and lead wire lead-out holes 9a, 9b extending from the submerged motor 1 side to the head cover 10 side are provided on the cooling water passage forming connection parts 7a, 7b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry submersible motor and a submersible motor pump equipped with an inverter, which are submerged in water and used.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Unexamined Patent Application Publication No. 10-9186 as a dry type submersible motor pump equipped with an inverter, a head cover is attached to a bracket on the side opposite to the output shaft of a submersible motor pump having a built-in submersible motor. It has been proposed to dispose the control circuit and inverter circuit inside a watertight chamber formed by a head cover and to separate the inverter circuit and control circuit, but to reduce the inconvenience of use. The bearing on the load side is not only shielded from the cold water around the main body by the head cover, but also has an inverter circuit part using a semiconductor power element that generates a large amount of self-heating inside the head cover. Heat generated by the bearing and heat generated by the inverter circuit shorten the life of the bearing and adversely affect the drive control circuit. There is a problem that the on.

[0003] This problem can easily be solved by adding a cooling device using part of the discharge water of the submersible motor pump or tap water, but the structure is complicated. There is a drawback that the frame is not so large and the frame becomes large.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to efficiently cool and remove heat generated by a bearing and an internal inverter circuit on the non-load side of a dry-type submersible motor to extend the life of the bearing and to improve the life of the internal inverter circuit. It is an object of the present invention to provide a dry-type submersible motor and a submersible motor pump which have a simple structure for cooling the heat generated in the section and are easy to assemble.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the first invention has a bearing fitting support portion fixed to the sub-output shaft side of a submersible motor. A head cover mounting bracket is integrally provided on the main bracket via an appropriate number of cooling water path forming connecting portions, and a head cover is fixed to the head cover mounting bracket, and a submersible motor frame is fixed to the main bracket with bolts. An inverter circuit unit and / or a drive control circuit unit are provided inside the head cover, and a lead wire drawing hole penetrating from the submersible motor side to the head cover side is provided in a part of the cooling water channel forming connecting portion. A dry type submersible motor and a submersible motor pump equipped with an inverter.

According to a second aspect of the present invention, a head cover body having a detachable lid is provided integrally with a main bracket.
On the main bracket in the head cover main body, a tunnel forming a cooling water passage S corresponding to the anti-output shaft is provided integrally with the main bracket and the head cover main body, and an inverter circuit unit and / or a drive control circuit unit is mounted on the tunnel. A dry type submersible motor and a submersible motor pump equipped with an inverter, wherein a lead wire drawing hole penetrating from the submersible motor side to the head cover side is provided in the main bracket.

[0007]

With this configuration, when the submersible motor pump is immersed in water and used, the bearing on the side opposite to the output shaft is cooled by the water in contact with the outer wall as in the case without the head cover. Due to the heat generated by the inverter circuit portion, the heated water between the main bracket and the head cover mounting bracket is replaced with the surrounding cold water to generate cooling water, thereby performing a cooling action by the cooling water. In addition, since the area around the head cover that houses the inverter circuit section and the control circuit section also comes into contact with water, it is cooled by the natural cooling water flow due to the generated heat as in the case of the bearing, and the above-mentioned problem is solved.

[0008]

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

FIG. 1 is a longitudinal sectional view of a first embodiment of the present invention, and FIG.
1 is a sectional view taken along the line AA of FIG. 1, 1 is a submersible motor having an impeller 2 mounted on the output shaft side, 3 is provided with a bearing fitting support portion 4 of the submersible motor 1, and six bolts 5 around the periphery It is a main bracket fixed to the sub-output shaft side of the frame 6 of the underwater motor.

As shown in FIG. 2, the main bracket 3 is integrally formed with a head cover mounting bracket 8 via T-shaped cooling water passage forming connecting portions 7a and 7b arranged on the outside right and left sides. The connecting portions 7a and 7b that form the cooling water passages S are provided with lead wire outlet holes 9a and 9b that also penetrate the main bracket 3 and the head cover mounting bracket 8.

In this embodiment, the connecting portion for forming the cooling water channel is T
Although it is shaped like a letter, it is also possible to receive an appropriate number of pillar-shaped ones and provide a lead wire lead-out hole in a part thereof.

Reference numeral 10 denotes a head cover fixed to the head cover mounting bracket 8 with six bolts (not shown).
The inverter circuit section 11 or the inverter circuit section 11 and a control circuit section are provided therein, and are connected to an external control device via a power supply and a signal cable 12.

[0013] With the above-described structure, when immersed in water, the bearing on the side opposite to the output shaft is cooled by water in contact with the main bracket 3 as in the case without the head cover, And inverter circuit section 11
Due to the heat generated, the heated water between the main bracket 3 and the head cover mounting bracket 8 is replaced with the surrounding cold water due to a temperature difference between the surrounding cold water and the cooling water, and as a result, the bearing on the side opposite to the output shaft is generated. And head cover 10
The inside inverter circuit section 11 is cooled.

Accordingly, the present invention is effective in improving the durability of the bearing, increasing the allowable current of an electronic circuit such as an inverter circuit housed in the head cover 10, and extending the life of the electronic circuit. Also, assembly
The head cover 10 may be bolted to the frame 6 of the submersible motor 1 via the main bracket 3 and the head cover mounting bracket 8 which are integrally formed, so that the assembly is extremely simple and an extra part protruding to the outside. Therefore, there is a practical benefit that it is very easy to use in practice, and it is an excellent structure that has solved the problems of the conventional dry-type submersible motor and submersible motor pump equipped with an inverter.

FIG. 3 is a longitudinal sectional view of a second embodiment of the present invention, and FIG.
FIG. 3 is a vertical sectional view taken along the line BB of FIG. 3. In this embodiment, a head cover body 101 having a lid 102 detachably provided is integrally provided on a main bracket 31 and the head cover body 1 is provided.
A tunnel 103 for forming a cooling water passage S corresponding to the anti-output shaft is provided integrally with the main bracket 31 and the head cover main body 101 on the main bracket 31 in the inner bracket 01, and the inverter circuit section 11 is fixed on the tunnel 103. Things. 9 is a submersible motor and inverter circuit 1
1 is a lead hole for connecting a lead wire.

With the structure described above, not only the same effects as in the first embodiment can be obtained, but also the assembly can be provided much easier than in the first embodiment.

[0017]

According to the present invention, the heat generated by the bearing on the non-load side and the internal inverter circuit in the dry-type submersible motor pump equipped with an inverter is efficiently cooled and removed, thereby extending the life of the bearing and reducing the deterioration of the inverter circuit portion due to the generated heat. It has the effect of preventing. In addition, it is possible to provide a structure that is simple and easy to manufacture and assemble.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a longitudinal sectional view of a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underwater motor 2 Impeller 3 Main bracket 4 Bearing fitting support part 5 Bolt 6 Frame 7a, 7b Cooling channel formation connection part 8 Head cover mounting bracket 9a, 9b Lead wire lead-out hole 10 Head cover 11 Inverter circuit part 12 Cable

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 5/22 H02K 5/22 9/19 9/19 Z (72) Inventor Shinji Goshima Onga-gun, Fukuoka (2) Inventor Takeshi Okayama 10-2-16 Inokuma, Inaga-gun, Fukuoka Prefecture F-term (reference) 3H022 AA01 BA01 BA03 BA07 CA50 DA02 DA07 DA12 5H605 AA01 BB06 BB07 CC01 CC02 CC06 CC10 EC01 EC03 EC13 EC14 EC20 5H609 BB02 PP01 PP05 PP06 PP07 PP08 PP09 PP10 PP11 PP16 QQ04 QQ21 RR30

Claims (2)

[Claims] 1. A head cover mounting bracket is provided integrally with a main bracket having a bearing fitting support portion fixed to a counter-output shaft side of a submersible motor via an appropriate number of cooling water passage forming connecting portions. A head cover is fixed to the head cover mounting bracket, and a frame of the underwater motor is fixed to the main bracket with a bolt. An inverter circuit unit and / or a drive control circuit unit is provided in the head cover, and the cooling water passage is formed. A dry type submersible motor and a submersible motor pump equipped with an inverter, wherein a lead wire lead-out hole penetrating from the submersible motor side to the head cover side is provided in a part of the connecting portion for the motor. 2. A head cover body having a cover body detachably provided integrally with a main bracket, and a tunnel forming a cooling water passage S corresponding to a non-output shaft on the main bracket in the head cover body. And an integral part of the head cover body, an inverter circuit part and / or a drive control circuit part are mounted on the tunnel, and a lead wire lead-out hole is provided in the main bracket from the underwater motor side to the head cover side. Submersible motor and submersible motor pump equipped with an inverter.