KR101054749B1 - Bearing unit in the submersible pump - Google Patents

Abstract

PURPOSE: A bearing unit submersible motor pump which improves the quality and durability of a submersible motor pump is provided to improve cooling efficiency and to improve lubrication property. CONSTITUTION: A bearing unit submersible motor pump comprises a bearing housing(110), a bearing, a bearing cover, and a lubricant supply member. The bearing housing is connected between the pump housing of the pump part and a motor housing of a underwater motor part. The bearing housing includes a bearing settling part on the center of inside. The bearing cover is combined in order to seal hermetically the bearing settling part.

Description

Bearing unit for submersible motor pump {BEARING UNIT IN THE SUBMERSIBLE PUMP}

The present invention relates to a bearing unit of a submersible motor pump, and more particularly, it is easy to replace and check the lubricating oil without requiring separate disassembly work so that the lubrication characteristics of the bearings are always maintained at the best state, and the cooling efficiency is improved. By maintaining the lubrication characteristics of the bearing, thereby improving the durability, maintainability, and quality of the submersible motor pump and relates to a bearing unit of the submersible motor pump to reduce the maintenance cost.

In general, a submersible motor pump for discharging water and slurry to the outside is installed in places such as water purification plants, wastewater treatment plants, fish farms, civil sites or basements where flooding is concerned.

Submersible motor pumps are categorized as submersible to be submerged in water and slurry, and ascending and descending to be installed as needed, but are always in contact with water.

1 is a view for explaining a conventional submersible motor pump, as shown in the submersible motor pump is composed of a submersible motor unit 10, and a pump unit 20 coupled to the lower portion of the submersible motor unit 10. .

The submersible motor unit 10 includes a motor housing 11, a main shaft 12 installed inside the motor housing 11, a rotor 13 installed on the main shaft 12, and a motor housing corresponding to the rotor 13 ( The stator 14 provided in the 11) side is provided. The main shaft 12 is rotatably supported by the upper bearing 15 provided at the upper end and the bearing unit 16 provided at the lower end.

The pump unit 20 includes a pump housing 21 having an inlet 21a and an outlet 21b, and an impeller 22 embedded in the pump housing 21 and coupled to the lower end of the main shaft 12.

When the submerged motor pump is immersed in water or the like, the cooling operation of the bearing unit 16 is performed through heat exchange with water. Since it is exposed to the medium, if it is operated for a long time in such an exposure state, there is a problem that overload occurs in the bearing unit 16 supporting the load, causing overheating and failure.

Accordingly, in recent years, as shown in the Republic of Korea Utility Model Registration No. 20-0388407 discloses an underwater motor pump having a separate cooling device for improving the cooling efficiency.

As shown in FIG. 2, the submersible motor pump having the cooling device includes a supply pipe 304 branching from an outlet formed in the pump housing 312, and a cooling jacket 305 communicating with the supply pipe 304. have. The cooling jacket 305 is formed in a cylindrical shape of which the upper part is open and the lower part is closed, and is coupled to the outer circumferential surface of the motor housing 306 by bolts.

The submersible motor pump equipped with the above-mentioned cooling device can cool the submersible motor 301 by the cooling jacket 305 surrounding the motor housing 306, but reduces the overload applied to the bearing unit or reduces the lubrication characteristics. It is irrelevant and has a separate cooling jacket 305, so the production cost is increased and there is a difficulty in maintenance work due to difficulties in dismantling. In addition, since the overall weight of the submersible motor pump is increased due to the cooling jacket 305, the overload of the bearing unit is rather increased.

On the other hand, the submersible motor pump is exposed to the high-speed rotation and vibration of the impeller to perform the pumping action, the failure is concentrated in the bearing unit portion that must support the load of the internal components, which acts as a major cause of troubleshooting Due to this, there is a problem of shortening the operating time of the submersible motor pump and reducing the overall lifespan.

The bearing unit 16 of the submersible motor pump is connected between the pump housing 21 of the pump unit 20 and the motor housing 11 of the submersible motor unit 10 as shown in FIG. An additionally provided bearing housing 16a, a bearing 16b mounted on the bearing seating portion of the bearing housing 16a, and a bearing cover 16c coupled to the upper portion of the bearing seating portion 16a.

In the bearing 16b, two single row rolling bearings are arranged up and down, and grease is injected into the rolling bearing as lubricant to reduce friction and wear and to extend fatigue life.

However, since the conventional bearing unit 16 has to perform the function of reducing the friction and extending the fatigue life only with grease first injected into the bearing before replacing the bearing 16b, the viscosity of the bearing unit 16 may be low. In addition, the thickness of the lubricating oil film is insufficient, which promotes abrasion of each part and causes vibration of the impeller 22, and thus causes various failure causes of the underwater motor part 10 and the pump part 20.

In addition, the conventional bearing unit 16 is in a situation that it is difficult to carry out practically because the submerged motor unit 10 and the pump unit 20 must be dismantled as a whole to replace or replenish grease. After this, the regular maintenance work is performed by replacing the whole bearings, which causes problems such as an increase in maintenance costs and a shortening of uptime.

In particular, the bearing unit 16 is directly affected by the high-speed rotation and vibration of the impeller 22, and because it must support the load of the internal components, due to the metal contact between the ball and the bearing ring inside the bearing 16b As the friction heat is generated, the grease is burned and the lubrication characteristics are worsened, which is a major cause of the failure of the submerged motor pump and the shortening of life.

The present invention has been proposed in view of the above, and it is easy to replace and check the lubricating oil without requiring separate disassembly work so that the lubrication characteristics of the bearings are always maintained in the best state, thereby improving durability and maintenance of the underwater motor pump. It is an object of the present invention to provide a bearing unit of an submersible motor pump that enables maintenance costs to be reduced.

Another object of the present invention is to provide a bearing unit of an underwater motor pump, in which the cooling efficiency is improved to maintain the lubrication characteristics of the bearing, thereby improving durability and quality of the underwater motor pump.

In order to achieve the above object, the bearing unit of the submersible motor pump according to the present invention is a bearing unit of the submersible motor pump, the bearing is connected between the pump housing of the pump unit and the motor housing of the submersible motor unit and the bearing seating portion in the inner center housing; A bearing seated on the bearing seating portion and rotatably supported by a main shaft inserted into the center hole; A bearing cover coupled to seal the bearing seat; And a lubricating oil supply means configured to pass through the bearing in the bearing housing so as to replace the lubricating oil by injecting the lubricating oil into the bearing or to discharge and check the lubricating oil in the bearing. The lubricating oil supply means may inject lubricating oil. Lubricating oil inlet is formed in the bearing housing so that; A lubricating oil flow path communicating with the lubricating oil inlet and formed such that the injected lubricating oil passes through the bearing; A lubricating oil outlet formed in the bearing housing so as to communicate with the lubricating oil flow path and discharge lubricating oil therein; And a fastener fastened to selectively open and close the lubricating oil inlet and the lubricating oil outlet, wherein the lubricating oil flow path is in communication with the lubricating oil inlet and extends and is formed on the bottom surface of the bearing seat; A lower surface movement path recessed and formed on a bottom surface of the bearing seat portion corresponding to the raceway wheel side of the bearing and in communication with the injection-side movement path; An upper surface moving path recessed and formed on a bottom surface of the bearing cover corresponding to the raceway wheel side of the bearing; And a discharge side moving path having one end connected to the upper surface moving path and the other end communicating with the lubricating oil outlet, wherein the bearing cover is configured to allow movement of the lubricating oil in a state assembled to the bearing housing. A connection groove may be recessed and formed in a bottom surface to connect the upper surface moving path and the discharge side moving path to each other.

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The fastener may be configured as an oil inlet having a check bolt for preventing a back bolt or a hard bolt.

In order to achieve the above object, the bearing unit of the submersible motor pump according to the present invention is characterized in that the bearing housing is provided with a cooling member capable of cooling by releasing the heat of the bearing side.

At this time, the cooling member may be composed of a plurality of cooling fins projecting radially on the bottom surface of the bearing seating portion.

The bearing unit of the submersible motor pump of the present invention can easily maintain the lubrication characteristics of the bearing at all times because the bearing unit of the submersible motor pump can easily perform the inspection and replacement of the lubricating oil through the lubricating oil supply means even without performing disassembly of the separate components. As a result, the durability of the underwater motor pump is remarkably improved.

In addition, since the cooling efficiency of the bearing unit is improved by the cooling member, durability is improved, and lubricating oil can be periodically replaced inside the bearing, so that the lubrication characteristics of the bearing unit can be kept constant even if the bearing is not unnecessarily replaced. There is an effect that the water retention is improved and the maintenance cost is reduced.

1 and 2 are views for explaining a bearing unit of a conventional submersible motor pump,
Figure 3 is an exploded perspective view showing a bearing unit of the submersible motor pump according to an embodiment of the present invention,
Figure 4 is a front sectional view showing a bearing unit of an underwater motor pump according to an embodiment of the present invention;
Figure 5 is a perspective view cut to show the main portion of the bearing unit of the submersible motor pump according to an embodiment of the present invention,
6A and 6B are views for explaining a bearing housing applied to a bearing unit of an underwater motor pump according to an embodiment of the present invention;
7A and 7B are views for explaining a bearing housing applied to a bearing unit of an underwater motor pump according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is an exploded perspective view showing a bearing unit of the submersible motor pump according to an embodiment of the present invention, Figure 4 is a front sectional view showing a bearing unit of the submersible motor pump according to an embodiment of the present invention, Figure 5 is a view of the present invention FIG. 1 is a perspective view cut out to show a main portion of a bearing unit of an underwater motor pump according to an exemplary embodiment. FIG. In FIG. 4 and FIG. 5, the hatching of the cross-sectional part is omitted. In FIG. 4, only the part corresponding to the main part of the present invention is hatched so that the gist of the present invention is clearly shown.

3 to 5, the bearing unit 100 of the submersible motor pump according to an embodiment of the present invention, the connection portion between the pump unit 200 and the submersible motor unit 300 constituting the submersible motor pump In the installed configuration, provided with a bearing housing 110, a bearing 120, a bearing cover 130 to guide and support the rotation of the main shaft 320 installed in the underwater motor unit 300, the lubrication of the bearing 120 Lubricating oil supply means 140 is further provided to improve the characteristics.

The bearing housing 110 is connected between the pump housing 210 of the pump unit 200 and the motor housing 310 of the submersible motor unit 300, and has a lower flange formed to be connected to the pump housing 210 at a lower portion thereof. (111), the upper flange 112 formed to be connected to the motor housing 310, the housing body 113 formed so that the space portion 113a is formed between the lower flange 111 and the upper flange 112, the housing The bearing seating part 114 is formed in the inner center of the main body 113 to the upper side and the bearing 120 to be described later is seated.

In addition, the bearing seating portion 114 is formed horizontally above the space portion of the housing main body 113, and a protruding ring 114a having a through hole into which the main shaft 320 is inserted in the center thereof, and the protruding ring 114a. Consists of a protrusion 114c extending in a cylindrical shape on the upper portion of the upper flange 112 so that the bearing installation groove 114b for inserting the bearing in the upper portion of the upper flange 112 is formed.

The bearing 120 is configured to be seated on the bearing seating part 114 and to be rotatably supported by inserting the main shaft 320 in the center hole. Various types of track wheels such as a ball or a taper roller are supported. Although the inserted bearing can be applied without limitation, in the present embodiment, it is composed of a structure in which two rolling bearings constituted by inserting a row of ball-shaped track wheels are arranged up and down.

The bearing cover 130 is coupled to seal the upper portion of the bearing seat 114, and has a through hole 132 in which the main shaft 320 is inserted into the center of the cover body 131 having a substantially disc shape. The flange portion 133 is formed through the plurality of fastening holes 133a so as to be bolted to the bearing seating portion 114 at its outer circumference.

Reference numeral 170 in FIG. 4 denotes an airtight member for maintaining airtightness, and is a retainer that is widely applied as an airtight member in the bearing unit.

6a and 6b are views for explaining a bearing housing applied to the bearing unit of the submersible motor pump according to an embodiment of the present invention, Figure 6a is a perspective view of the upper portion, Figure 6b is a lower portion One perspective view. 7a and 7b are views for explaining a bearing housing applied to the bearing unit of the submersible motor pump according to an embodiment of the present invention, Figure 7a is an overall perspective view, Figure 7b is a cutaway perspective view.

The lubricant supply means 140 is configured to inject and discharge lubricant to inject and replace lubricant by injecting lubricant into the bearing 120 or to discharge and inspect the lubricant inside the bearing 120. It is formed in the bearing housing 110 and the bearing cover 130 to pass through.

In addition, the lubricating oil supply unit 140 may include a lubricating oil inlet 141 and a lubricating oil inlet 141 which are formed inward from an outer circumferential surface of the bearing housing 110 so as to inject lubricating oil as shown in FIGS. 4 to 7B. Lubricating oil flow path 142 is formed so as to communicate with the injection and is injected through the bearing 120, the lubricating oil formed in the bearing housing 110 so as to communicate with the lubricating oil flow path 142 and discharge the lubricating oil therein The outlet 143 and the fastener 144 is fastened to selectively open and close the lubricating oil inlet 141 and the lubricating oil outlet 143.

In addition, the lubricating oil flow path 142 communicates with the lubricating oil inlet 141 and extends and is formed in a “b” shape toward the bottom of the bearing seating part 114 to form the track of the injection side 142a and the bearing 120. An upper surface recessed and formed on the bottom surface of the bearing seating portion 114 corresponding to the wheel side and formed on the bottom surface of the lower surface movement path 142b and the bearing cover 130 communicating with the injection-side movement path 142a. One end is formed in communication with the sub-movement path 142c and the upper surface movement path 142c, and the other end is composed of the discharge-side movement path 142d formed in an inverted " n " shape in communication with the lubricating oil outlet 143. It will form a single flow path. At this time, the lower surface portion moving path 142b and the upper surface portion moving path 142c have a hemispherical groove-shaped cross-sectional structure and the overall shape is recessed and formed at a position corresponding to the track wheel side of the bearing 120, thereby forming a lower surface moving path. When lubricating oil is pressurized from 142b, it is made to move to the upper surface moving part 142c via the raceway wheel of the bearing 120. FIG.

In addition, the bearing cover 130 has a top surface movement path 142c and a discharge side movement path 142d to allow the movement of the lubricating oil in a state assembled in the bearing housing 110 as shown in FIGS. 7A and 7B. Connection grooves 142e are formed in the bottom surface to be connected to each other. The connecting groove 142e is recessed in a straight line from the cover body 131 toward the flange portion 133 so that the upper surface moving path 142c and the discharge side moving path 142d are connected to each other.

The fastener 144 may be separated at the time of injection of the lubricating oil in a state of being fastened to the lubricating oil inlet 141 and the lubricating oil outlet 143, and is limited to a conventional bolt or the like as long as it is a member that can be tightened and sealed again after the filling is completed. Although it can be applied without, in this embodiment, even if the vibration force is transmitted from the main shaft 320 or the impeller 220 is composed of a mood bolt (hard lock set screw) not easily separated. The lubricating oil inlet 141 and the lubricating oil outlet 143 are formed with female threads for fastening the fastener to the inner circumferential surface of the inlet side.

In addition, the fastener 144 is an oil injection port (usually called a horn) or an oil injection hole with a check valve for preventing backflow so that the injection operation can be performed without disassembling separately when the lubricant is injected. It can also be configured as.

4 and 6B, the bearing unit 100 of the submersible motor pump according to the exemplary embodiment of the present invention includes a cooling member 150 to discharge heat generated from the bearing 120 side. do.

The cooling member 150 may be configured in various forms as long as it can cool the bearing 120 to prevent deterioration or burnout of the lubricating oil contained in the bearing 120. In the present embodiment is composed of a plurality of cooling fins 151 formed in the bearing housing 110 receives heat from the bearing 120.

In addition, in the present embodiment, the bottom surface of the bearing 120 is in close contact with each other to improve the cooling characteristics, and heat is easily transmitted, and the bottom surface of the bearing seating portion 114 in contact with the space portion 113 for discharge of the heat (protrusion ring ( 114a)), the cooling fin 151 is formed. At this time, the cooling fin 151 is formed to protrude radially to maximize the heat generating area.

Hereinafter will be described the action of the bearing unit of the submersible motor pump according to an embodiment of the present invention.

First, assembling the stator 330 inside the motor housing 310, and sequentially stacking the bearing 120 on the bearing seating part 114 of the bearing housing 110, and coupling the bearing cover 130 to the bearing. After assembling the unit 100, the upper flange 112 of the bearing housing 110 is fastened and fixed to the flange 311 of the motor housing 310. In addition, the main shaft 320 including the rotor 340 is inserted into the motor housing 310 to fix the central part of the main shaft to be inserted into the bearing 120, and then perform a connection operation. When the housing cover 350 is fastened, the assembly of the underwater motor unit 300 is completed.

Subsequently, when the impeller 220 is fastened to the lower end of the main shaft 320 and the pump housing 210 is fastened to the lower flange 111 of the bearing housing 110, the underwater motor pump has a shape as shown in FIG. 4. The overall assembly is completed, this assembly method is only one example and can be implemented in a number of different assembly methods and orders in consideration of the convenience of assembly.

As described above, when the assembled and completed submersible motor pump is installed at an installation place such as a water purification plant, a wastewater treatment plant, or a fish farm, and operates the underwater motor unit 300, according to the electrical interaction between the stator 330 and the rotor 340. As the main shaft 320 is rotated and the impeller 220 coupled to the lower end thereof is rotated, the sucked object is sucked through the suction port 211 and discharged to the discharge port 212.

As described above, the operation of the bearing unit 100 in the state where the submersible motor pump is operating will be described briefly. The bearing 120 supports the load of the main shaft 320 including the rotor 340 and the impeller 220. While maintaining the predetermined viscosity and the thickness of the lubricating oil film according to the lubrication action of the lubricating oil contained therein, the main shaft 320 is smoothly rotated by reducing friction and wear of each part. At this time, since the bearing 120 is mechanically coupled to the main shaft 320 which is rotated at a high speed, a certain amount of frictional heat is naturally generated, but the heat generated in this way is provided through the bearing seat 114 to the cooling fin ( 151 is transmitted to the space 113 of the bearing housing 110 while being delivered to the bearing is not heated any more and maintains a constant temperature.

In addition, the cooling unit 151 is formed on the bottom surface of the bearing housing 110 as in the present embodiment, and manufactured by an underwater motor pump having an output of 22 kw and operated for a long time under the condition of 1750 rpm. As a result of measuring the heating temperature of), it was found that the temperature was shown to be below 60 ℃ without adversely affecting the physical properties of the rolling bearing itself and the properties of the lubricant. In this way, if the temperature of the bearing unit 100 is kept constant, not only does not lubricating oil burn, but also maintains a constant viscosity, so that burning and damage of the bearing unit 100, which is the main cause of failure of the underwater motor pump, is prevented in advance, and thus durability is achieved. This effect is remarkably improved.

On the other hand, when the submersible motor pump is operated for a long time to reach the point of replacement of the lubricating oil contained in the bearing unit 100, it is possible to ensure the durability of the submersible motor pump by replacing only the lubricating oil without replacing the entire bearing as in the prior art. In particular, when the lubricant is replaced, the lubricant may be conveniently replaced without disassembling the submersible motor unit 300 and the pump unit 200. That is, after the rotation of the underwater motor unit 300 is stopped and the fastener 144 fastened to the lubricating oil inlet 141 and the lubricating oil outlet 143 is removed, a lubricating oil injecting gun (not shown) is provided in the lubricating oil inlet 141. It can be performed simply by inserting, manipulating and injecting.

 Looking at the injection method of the lubricant in detail, the lubricating oil which is pumped to the lubricating oil inlet 141 by the lubricating oil injection gun flows into the lower surface moving path (142b) through the injection-side moving path (142a) of the bearing 120 It is filled while moving to the upper surface moving path (142c) via the track wheel. At this time, the contaminated lubricating oil remaining inside the bearing 120 is introduced with the replacement lubricating oil and at the same time, the upper surface moving path 142c, the connecting groove 142e, the discharge side moving path 142d, and the lubricating oil outlet 143 Is discharged to the outside through the discharge path leading to).

When the replacement lubricant is discharged to the lubricating oil outlet 143 through the injection of the lubricating oil, the contaminated lubricating oil inside the bearing 120 is discharged and the replacement lubricating oil is filled, so that the lubricating oil inlet 141 and The fastener 144 is re-fastened to the lubricating oil outlet 143 again to complete the lubricating oil replacement work.

If the lubricating oil is periodically replaced inside the bearing 120 in the above-described manner, the lubrication characteristics of the bearing unit 100 are improved even if the bearing is not unnecessarily replaced, thereby improving durability and reducing maintenance costs. Can be.

What has been described above is just one embodiment for carrying out a bearing unit of the submersible motor pump according to the present invention, the present invention is not limited to the above embodiment, as claimed in the following claims Those skilled in the art to which the present invention pertains without departing from the spirit of the present invention will have the technical idea of the present invention to the extent that various modifications can be made.

100: bearing unit 110: bearing housing
114: bearing seating part 120: bearing
130: bearing cover 140: lubricating oil supply means
141: lubricating oil inlet 142: lubricating oil flow path
142a Injection side movement path 142b: Lower surface movement path
142c: upper surface moving path 142d: discharge side moving path
142e: Connecting groove 143: Lubricant outlet
144: fastener 150: cooling member
151: cooling fin 200: pump section
210: pump housing 220: impeller
300: underwater motor unit 310: motor housing
320: spindle

Claims (7)

In the bearing unit of the submersible motor pump,
A bearing housing connected between the pump housing of the pump unit and the motor housing of the submersible motor unit and having a bearing seat at an inner center thereof;
A bearing seated on the bearing seating portion and rotatably supported by a main shaft inserted into the center hole;
A bearing cover coupled to seal the bearing seat;
Lubricating oil supply means formed to pass through the bearing in the bearing housing to be replaced by injecting lubricating oil into the bearing or to discharge and check the lubricating oil in the bearing,
The lubricating oil supply means,
A lubricant injection hole formed in the bearing housing to inject lubricant;
A lubricating oil flow path communicating with the lubricating oil inlet and formed such that the injected lubricating oil passes through the bearing;
A lubricating oil outlet formed in the bearing housing so as to communicate with the lubricating oil flow path and discharge lubricating oil therein; And
And a fastener fastened to selectively open and close the lubricating oil inlet and the lubricating oil outlet.
The lubricating oil flow path,
An injection side movement path communicating with the lubricating oil injection port and extending and formed toward a bottom surface of the bearing seat;
A lower surface movement path recessed and formed on a bottom surface of the bearing seat portion corresponding to the raceway wheel side of the bearing and in communication with the injection-side movement path;
An upper surface moving path recessed and formed on a bottom surface of the bearing cover corresponding to the raceway wheel side of the bearing; And
One end is formed in communication with the upper surface moving path and the other end comprises a discharge side moving path formed in communication with the lubricating oil outlet,
The bearing cover is a bearing unit of the submersible motor pump formed in the bottom groove, the connection groove is formed in the bottom surface to connect the upper surface movement path and the discharge side movement path to enable movement of the lubricating oil in the state assembled to the bearing housing.
delete delete delete The method of claim 1,
The fastener is a bearing unit of the submersible motor pump, characterized in that the oil inlet is built in a check bolt for preventing the back bolt (hardlock set screw) or backflow.
The method according to claim 1 or 5,
The bearing housing is a bearing unit of the submersible motor pump, characterized in that the cooling member capable of cooling by releasing the heat on the bearing side.
The method of claim 6,
The cooling member is a bearing unit of an underwater motor pump, characterized in that consisting of a plurality of cooling fins projecting radially on the bottom surface of the bearing seat.

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