CN210218565U

CN210218565U - Gear reducer capable of being installed in submersible mixer shell

Info

Publication number: CN210218565U
Application number: CN201920272493.2U
Authority: CN
Inventors: Lin Huang; 黄林
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-04
Filing date: 2019-03-04
Publication date: 2020-03-31
Anticipated expiration: 2029-03-04

Abstract

The utility model relates to a gear reducer which can be installed in a submersible mixer shell, which is characterized in that a three-shaft type two-stage cylindrical helical gear is used for reducing speed, and an input shaft and an output shaft are the same axis; after the gear reducer and the submersible mixer are assembled and combined, a rotating 4P motor arranged at the rear part in the submersible mixer shell drives a mixer impeller to rotate after two-stage speed reduction through a gear; the rotating speed of the output shaft after being decelerated is the same as the rated rotating speed of the impeller of the original multi-P motor directly driven stirrer; the gear reducer has high transmission efficiency and long service life, and can meet the requirement of the submersible mixer on long-term continuous operation working conditions.

Description

Gear reducer capable of being installed in submersible mixer shell

Technical Field

The utility model belongs to the water treatment facilities field, in particular to can install gear reducer in dive mixer casing.

Background

The submersible mixer is a device which is used in a large amount in municipal and industrial sewage treatment process flows, and at present, most domestic submersible mixers use a motor direct-connected driving structure form; because of the continuous requirement of the water treatment process flow, the submersible mixer equipment has to continuously run for a long time without stopping, so that the power consumption is extremely high.

The traditional submersible mixer adopts a structural form that a multi-P alternating current motor directly drives an impeller, a torque power source is directly provided by the motor according to the rated rotating speed and power requirements of impellers of different types, the motor with low power (4Kw and below) is generally designed according to the 8P standard, and the motor with 5Kw and above power is generally designed according to the 12P standard; the more P numbers of the nominal motors with the same power, the larger the working current, the lower the power factor and the higher the power consumption; how to realize reducing power consumption through improving many P motor direct-connected dive mixer transmission structure is the technical problem that technical staff in the field awaits urgent need to solve at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims to improve the transmission structure of the submersible mixer, and changes the original structure of directly driving the impeller by a plurality of P motors into a transmission structure of indirectly driving the impeller by a 4P motor driving gear reducer arranged in the housing of the submersible mixer; the 4P motor has obvious electricity-saving performance relative to a plurality of P motors, the advantage of transmission efficiency of the secondary cylindrical helical gear up to 98 percent and the physical characteristic of torque increase of gear reduction, so that the efficiency of the submersible mixer with a new structure can be greatly improved; the submersible mixer with the new structure and the gear reducer has small change of the overall dimension, the weight of the whole submersible mixer is reduced by about 1/4, and the submersible mixer can be directly applied to the original installation system, thereby being beneficial to updating equipment and selecting new water treatment projects for water treatment enterprises.

In order to achieve the purpose of the utility model, the following technical proposal is adopted:

the gear reducer capable of being installed in a submersible mixer shell is characterized in that a three-shaft type two-stage cylindrical helical gear is used for reducing speed, an input shaft and an output shaft in the three shafts are the same axis, and the axis of an intermediate shaft is parallel to the axis of the input shaft; the power transmission route of the gear reducer and the submersible mixer during working after assembly and synthesis is as follows: a motor shaft gear on a rotating motor rotor shaft (namely an input shaft → a first-stage reduction gear on the right side of an intermediate shaft under the axis of an engaged driving motor → a second-stage driving gear on the left side of an intermediate shaft body → a second-stage reduction gear on an output shaft coaxially driven with the motor shaft → a driving stirrer impeller to rotate; the speed of the output shaft after speed reduction is the same as the rated speed of the impeller of the original multi-P motor directly driven stirrer.

Drawings

Fig. 1 is a schematic structural diagram of a product which is already applied to a submersible mixer with a new structure, namely a gear reducer arranged in a submersible mixer shell, wherein the range of a dotted line frame is the main structural part of the gear reducer.

FIG. 2 is a schematic sectional view taken along line A-A of the gear reducer of FIG. 1, in which the elliptical aperture is shown in cross-section in a radial partial cross-sectional view of a first reduction gear pair; the numbers in the figures are as follows:

① -gear reducer box, ② -submersible mixer casing, ③ -motor shaft gear, ④ -primary reduction gear, ⑤ -intermediate shaft, ⑥ -secondary reduction gear and ⑦ -output shaft

Detailed Description

The present invention will be described more fully with reference to the following examples and accompanying drawings.

A gear reducer capable of being installed in a submersible mixer shell is characterized in that a three-shaft two-stage cylindrical helical gear is used for reducing speed, the gear reducer mainly comprises a gear reducer box ①, a motor shaft gear ③, a primary reduction gear ④, an intermediate shaft ⑤, a secondary reduction gear ⑥, an output shaft ⑦, relevant standard parts and other parts, after the gear reducer and the submersible mixer are assembled and combined, a rotating 4P motor installed at the rear part of the gear reducer in the submersible mixer shell ② serves as a power source to drive a mixer impeller to rotate, and the rotating speed of the reduced output shaft is the same as the rated rotating speed of the original multi-P motor for directly driving the mixer impeller.

The box ① of gear reducer is made of aluminum alloy, the box is cylindrical, the box has front, middle and back walls on its axial section, and is divided into front and back boxes, the lower sides of the front and back boxes are closed, the upper side of the box has windows for installing gears and bearings, the front, middle and back walls of the box have two sets of holes with parallel axes, one set of axes is coaxial with the central line of the cylindrical box, the other set is parallel with the central line of the box, the radial section of the box is similar to the deformed sub-character geometric shape, the outer cylinders of the front and middle walls of the box have symmetrically distributed V-shaped notches, the outer circle of the box is positioned in the shell ② of the submersible mixer with new structure, and is divided into two crescent-shaped spaces by the box wall parallel to the axes, the side wall of the box has several oil return holes communicated with the crescent-shaped spaces, the front end of the central hole of the front wall of the box has bearing positioning holes, the center hole of the middle wall of the box has bearing holes for the bearing holes, the bearing holes are arranged in the bearing holes of the middle wall of the box, the bearing holes are arranged in the bearing holes of the box, the bearing holes for the bearing holes of the bearing seat, the bearing holes of the middle wall of the box are arranged in the bearing seat, the bearing holes of the box, the bearing holes of the bearing seat, the bearing holes are arranged in the box.

The front bearing seat of the gear reducer is made of aluminum alloy, the axial appearance of the front bearing seat is in a shape of a Chinese character ya, a bearing hole is arranged on a central axis, a double-row angular contact ball bearing with sealing rings on two sides is arranged in the bearing hole, and a convex bearing shell and a reducer box body are used for radial and axial positioning and are connected through screws.

The rear end of the gear reducer box body is connected with a motor front bearing seat by screws, the motor front bearing seat is made of aluminum alloy materials, the axial appearance of the motor front bearing seat is a cylinder, the front end of a shaft hole in the center of the box body is provided with an annular positioning boss and a positioning seat hole for installing a mechanical sealing assembly, an elastic retaining ring groove is arranged in a hole in the bearing hole at the rear end, and a guide step hole convenient for bearing installation is arranged in a hole opening of the bearing hole.

A hole elastic retainer ring clamped in a shell hole of the submersible mixer is shared between a bearing seat at the front end of the motor and a gear reducer box body to axially position the motor and the gear reducer.

The motor shaft gear ③ is tightly mounted on the front end shaft neck of the motor rotor shaft in the form of cylindrical hole and flat key connection, a mechanical seal assembly is mounted between the motor shaft gear and the motor front bearing seat, the tooth shape of the motor shaft gear is a helical gear which is formed by grinding, and the motor shaft gear extending into the rear box chamber of the reducer box body is meshed with the primary reduction gear on the intermediate shaft to form primary reduction.

The right side of the intermediate shaft is provided with a primary reduction gear ④ in involute spline sleeve connection, the tooth form of the primary reduction gear ④ is a milled helical gear, the shaft necks at two ends are provided with tapered roller bearings, the gear on the body of the intermediate shaft ⑤ is a secondary reduction driving gear, the tooth form of the secondary reduction driving gear is a milled helical gear, and a thrust retaining ring is arranged between the primary reduction gear and the tapered roller bearing at the right end.

The right side of the output shaft is provided with a secondary reduction gear ⑥ in involute spline sleeve connection, the tooth form of the secondary reduction gear ⑥ is a helical gear formed by grinding, the eccentric left side of the output shaft ⑦ is provided with a double-row angular contact ball bearing with two sealed ends, the rear end shaft neck is provided with a thrust retainer ring and a cylindrical roller bearing, and a secondary reduction gear pair is arranged in a front box chamber of a gear reducer box body.

The gear reducer is novel in structure, and the crescent space outside the divided box body is convenient for self-circulation cooling and self-cleaning of lubricating oil; the convenient and fast adjusting measure of the pre-tightening force of the intermediate shaft bearing can improve the bearing capacity of the gear, prolong the service life of the bearing and the gear and reduce noise; the bearings all adopt imported international brand products; the dynamic sealing part of the oil cavity of the box body adopts mechanical sealing with long service life; the gear parts adopt high-quality alloy steel forgings and a carbonitriding heat treatment process, and the above embodiment provides multiple guarantees for the long-term safe operation of the gear reducer; the submersible mixer with the new structure provided with the gear reducer has excellent electricity-saving effect, and the product design meets the related product safety and reliability requirements in the national industry standard CJ/T109-2007 of submersible mixers.

In addition to the above embodiments, the present invention can also have other embodiments, and all technical solutions formed by equivalent replacement or equivalent transformation are all within the protection scope claimed in the present invention.

Claims

1. A gear reducer capable of being installed in a submersible mixer shell is characterized in that the transmission structure of the gear reducer is a three-shaft type, an input shaft and an output shaft are the same axis, and a parallel-shaft cylindrical helical gear is adopted for secondary speed reduction; after the gear reducer and the submersible mixer are assembled and synthesized, a rotating 4P motor at the rear part of the gear reducer is used as a power source to drive a mixer impeller to rotate; the speed of the output shaft after speed reduction is the same as the rated speed of the impeller of the original multi-P motor directly driven stirrer.

2. A gear reducer mountable in a submersible mixer housing according to claim 1, wherein: the box body of the gear reducer is made of aluminum alloy, the radial section of the box body is in a deformed herringbone geometric shape, the axial section of the box body is divided into a front box chamber and a rear box chamber, the axial section of the box body is provided with two groups of hole systems with parallel axes, one group of hole systems is coaxial with the central line of the box body and is used for arranging and positioning the shafting of an input shaft and an output shaft, and the other group of hole systems is used for arranging and positioning the shafting of an intermediate shaft; one end of the bearing hole of the intermediate shaft of the box body is provided with a threaded hole for the bearing pre-tightening gland to exert the pre-tightening force function on the intermediate shaft bearing.

3. A gear reducer mountable in a submersible mixer housing according to claim 1, wherein: the front bearing seat of the speed reducer is made of aluminum alloy, the axial appearance of the body of the front bearing seat is in a shape like a Chinese character 'ya', a bearing hole is formed in the central axis, and a bearing shell protruding out of the bearing shell is radially and axially positioned with the speed reducer box body after the bearing in the hole is assembled and is connected with the speed reducer box body through screws.

4. A gear reducer mountable in a submersible mixer housing according to claim 1, wherein: the rear end of the reducer box body is connected with a motor front bearing seat by screws, the motor front bearing seat is made of aluminum alloy, the axial appearance of the body is cylindrical, the front end of a central hole is provided with an annular positioning boss and a step hole for installing a mechanical sealing assembly, an elastic retaining ring groove is arranged in a hole in the rear end of the bearing hole, and a guide step hole convenient for bearing installation is arranged in a hole opening of the bearing hole.

5. A gear reducer mountable in a submersible mixer housing according to claim 1, wherein: the motor shaft gear is used as power input and is fixedly arranged on a front end shaft neck of a motor rotor shaft in a cylindrical hole and flat key connection mode, the tooth shape of the motor shaft gear is a helical gear which is formed by grinding, the motor shaft gear extends into a rear box chamber of a reducer box body and is meshed with a primary reduction gear pair on a middle shaft to form primary reduction of a gear reducer.

6. A gear reducer mountable in a submersible mixer housing as claimed in claim 1, wherein: the right side of the intermediate shaft is provided with a primary reduction gear in sleeved connection with an involute spline, and the shaft necks at the left end and the right end are both provided with tapered roller bearings; the gear on the intermediate shaft body is a secondary speed reduction driving gear, the tooth shape of the gear is a helical gear which is formed by grinding, the tooth shape of the primary speed reduction gear is a helical gear which is formed by grinding, and an inner hole is an involute spline; and a thrust retainer ring is arranged between the first-stage reduction gear and the right tapered roller bearing.

7. A gear reducer mountable in a submersible mixer housing according to claim 1, wherein: the output shaft is provided with a secondary reduction gear sleeved with an involute spline, the gear is a helical gear formed by grinding, a double-row angular contact ball bearing with sealing rings on two sides is arranged on a journal on the left side of the gear, a thrust retainer ring is arranged on the right side of the gear, a cylindrical roller bearing is arranged on a journal on the rear end, and a secondary reduction gear pair is arranged in a front box chamber of a gear reducer box body.