阅读说明：本技术 一种往复循环的离心式水泵 (Reciprocating circulation centrifugal water pump ) 是由 王展 张洪铭 于 2021-05-13 设计创作，主要内容包括：本发明涉及离心泵技术领域,具体为一种往复循环的离心式水泵,包括底座和底座上的泵体,泵体的一侧连接有电机座,泵体的两侧分别设有进水管和出水管,所述电机座远离泵体的一端开设有电机室,所述电机室的端壁上开设有与泵体连通的轴孔,所述电机座的内部开设有位于轴孔外侧的冷却腔。本发明通过在轴孔的外侧设置冷却腔对电机轴进行降温,并从进水管通入水流,水流排入出水管内流出,使冷却腔内的水流始终保持流动,能够快速稳定地带走轴孔内的热量,在电机座上安装了润滑油盒,通过冷却腔内的水流带动控制阀控制润滑油自动滴落,提高轴孔内的润滑效果,降低电机轴的摩擦,从而减少电机轴的磨损和发热量,进一步提高了设备的工作状态。(The invention relates to the technical field of centrifugal pumps, in particular to a reciprocating centrifugal water pump which comprises a base and a pump body on the base, wherein a motor base is connected to one side of the pump body, a water inlet pipe and a water outlet pipe are respectively arranged on two sides of the pump body, a motor chamber is arranged at one end, away from the pump body, of the motor base, a shaft hole communicated with the pump body is formed in the end wall of the motor chamber, and a cooling cavity located on the outer side of the shaft hole is formed in the motor base. According to the invention, the cooling cavity is arranged outside the shaft hole to cool the motor shaft, water flow is introduced from the water inlet pipe and discharged into the water outlet pipe to flow out, so that the water flow in the cooling cavity is kept flowing all the time, the heat in the shaft hole can be quickly and stably taken away, the lubricating oil box is arranged on the motor base, the control valve is driven by the water flow in the cooling cavity to control the lubricating oil to automatically drip, the lubricating effect in the shaft hole is improved, the friction of the motor shaft is reduced, the abrasion and the heat productivity of the motor shaft are reduced, and the working state of the equipment is further improved.)

1. The utility model provides a centrifugal water pump of reciprocating cycle, includes pump body (2) on base (1) and base (1), and one side of the pump body (2) is connected with motor cabinet (3), and the both sides of the pump body (2) are equipped with inlet tube (4) and outlet pipe (5), its characterized in that respectively: a motor chamber (9) is arranged at one end of the motor seat (3) far away from the pump body (2), the end wall of the motor chamber (9) is provided with a shaft hole (10) communicated with the pump body (2), a cooling cavity (11) positioned outside the shaft hole (10) is arranged inside the motor base (3), the outer walls of the two sides of the motor base (3) are respectively provided with a first cooling pipe (6) communicated with the water inlet pipe (4) and a second cooling pipe (7) communicated with the water outlet pipe (5), the first cooling pipe (6) extends to the inside of the water inlet pipe (4), the end part of the first cooling pipe (6) faces to the opening of the water inlet pipe (4), the outer walls of the two sides of the motor base (3) are both provided with communicating holes (12) communicated with the cooling cavity (11), the two communicating holes (12) are respectively communicated with the first cooling pipe (6) and the second cooling pipe (7);

the motor cabinet structure is characterized in that an oil box groove is formed in the top wall of the motor base (3), a lubricating oil box (8) is installed in the oil box groove, a lower oil hole (22) communicated with the shaft hole (10) is formed in the bottom wall of the oil box groove, an insertion pipe (24) is installed on the top end of the lower oil hole (22), an impeller groove (14) is formed in the top wall of the cooling cavity (11), an impeller (13) extending to the inside of the cooling cavity (11) is installed inside the impeller groove (14), a mounting hole (15) is formed in the end wall of the motor chamber (9), a control valve for controlling the opening and closing of the lower oil hole (22) is installed on the inner wall of the mounting hole (15), and the control valve is in transmission connection with the impeller (13).

2. A reciprocating centrifugal water pump according to claim 1 wherein: the cooling cavity (11) is of an arc-shaped structure, the cooling cavity (11) is wrapped on the outer side of the shaft hole (10), and the cooling cavity (11) is divided into two parts which are symmetrically arranged on two sides of the lower oil hole (22).

3. A reciprocating centrifugal water pump according to claim 1 wherein: the lubricating oil box (8) comprises a box body (801), fixing plates (806) are connected to the outer walls of the two sides of the box body (801), the fixing plates (806) are fixedly attached to the outer wall of the motor base (3) through bolts, an oil outlet is formed in the bottom end of the box body (801), and a rubber plug (805) is mounted on the oil outlet.

4. A reciprocating centrifugal water pump according to claim 3 wherein: the top end of the box body (801) is connected with a piston cylinder (802), a piston (803) is arranged in the piston cylinder (802), and a pressurizing spring (804) is connected between the inner top wall of the piston cylinder (802) and the piston (803).

5. A reciprocating centrifugal water pump according to claim 1 wherein: the control valve includes that the level inserts valve plate (20) of establishing on the inner wall of installing port (15), valve opening (21) have been seted up on valve plate (20), the board groove with valve plate (20) adaptation is seted up to the inside of motor cabinet (3), install reset spring (23) of being connected with valve plate (20) on the end wall in board groove, the bevel connection has been seted up to the tip of valve plate (20), the control valve is still including rotating big belt pulley (18) of installing on installing port (15) inner wall, install driving lever (19) of mutually supporting with valve plate (20) on big belt pulley (18), and when driving lever (19) sweep the bevel connection on valve plate (20), reset spring (23) compress.

6. A reciprocating centrifugal water pump according to claim 5 wherein: install on the inner wall of installing port (15) and impeller (13) coaxial coupling's little belt pulley (16), little belt pulley (16) are connected through belt (17) transmission with big belt pulley (18).

7. A reciprocating centrifugal water pump according to claim 1 wherein: half of the impeller (13) is accommodated in the impeller groove (14).

Technical Field

The invention relates to the technical field of centrifugal pumps, in particular to a reciprocating centrifugal water pump.

Background

Centrifugal pumps operate by causing water to move centrifugally as a result of the rotation of an impeller. Before the water pump is started, the pump shell and the water suction pipe are filled with water, then the motor is started, the pump shaft drives the impeller and the water to rotate at a high speed, the water is thrown to the outer edge of the impeller to be thrown into a water pressure pipeline of the water pump through a flow channel of the volute-shaped pump shell.

In the prior patent (publication number: CN112032060A), an internal circulation cooling type multistage centrifugal pump comprises a pump body, a protective cover, an installation groove body, a first impeller shaft, a second impeller shaft and an impeller, wherein a water inlet pipe and a water outlet pipe are arranged on the pump body; the pump comprises a pump body and is characterized in that a partition plate is arranged in the pump body, a first bearing is arranged on the partition plate, a first impeller shaft is fixed in the first bearing, an impeller is fixed on the first impeller shaft, the tail end of the pump body is connected with a protection box, and a through hole is formed in one side of the protection box; the connection face of the protection box and the pump body is provided with a second bearing, a second impeller shaft is inserted into the second bearing, and the tail end of the second impeller shaft penetrates through the through hole to extend to the outer side.

In the process of implementing the above invention, the inventor finds that at least the following problems in the prior art are not solved:

1. the two ends of the circulating cooling pipe are arranged in the pump body, so that the water flow in the circulating cooling pipe cannot be ensured to be in a flowing state all the time, the heat dissipation effect is poor, and the impeller shaft cannot be stably cooled;

2. the invention and the existing centrifugal pump lack a mechanism for lubricating the impeller shaft, need to be maintained and maintained regularly by manpower, are complicated, and the lack of lubrication of the impeller shaft can obviously increase the heat productivity, so that equipment is failed and damaged.

To this end, a reciprocating centrifugal water pump is proposed.

Disclosure of Invention

The invention aims to provide a reciprocating-circulation centrifugal water pump, wherein a cooling cavity is arranged on the outer side of a shaft hole to cool a motor shaft, water flow is introduced from a water inlet pipe and discharged into a water outlet pipe to flow out, so that the water flow in the cooling cavity is always kept flowing, heat in the shaft hole can be quickly and stably taken away, a lubricating oil box is arranged on a motor base, a control valve is driven by the water flow in the cooling cavity to control lubricating oil to automatically drip, the lubricating effect in the shaft hole is improved, the friction of the motor shaft is reduced, the abrasion and the heat productivity of the motor shaft are reduced, and the working state of equipment is further improved.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a reciprocating circulation's centrifugal pump, includes the pump body on base and the base, and one side of the pump body is connected with the motor cabinet, and the both sides of the pump body are equipped with inlet tube and outlet pipe respectively, the motor cabinet is kept away from the one end of the pump body and has been seted up the motor room, set up the shaft hole with pump body intercommunication on the end wall of motor room, the cooling chamber that is located the shaft hole outside is seted up to the inside of motor cabinet, install the first cooling tube that communicates with the inlet tube and the second cooling tube that communicates with the outlet pipe on the outer wall of motor cabinet both sides respectively, the tip of first cooling tube and first cooling tube that extends to the inside of inlet tube is towards the opening part of inlet tube, all set up the intercommunicating pore with the cooling chamber intercommunication on the outer wall of motor cabinet both sides, and two intercommunicating pores communicate with first cooling tube and second cooling tube respectively.

When the centrifugal pump begins work, rivers get into the pump body from the inlet tube, and discharge from the outlet pipe, partly rivers pass through first cooling tube and get into the cooling chamber, and follow the discharge in the outlet pipe from the second cooling tube discharge, the rivers in the cooling chamber keep flowing, the heat that produces in the shaft hole is in time absorbed and taken away, make the inside temperature environment that is in all the time in shaft hole, avoid the motor shaft to be in under the too high operating temperature, improve equipment's operating condition, cooling method for present stage is more high-efficient, help improve equipment's life.

The motor cabinet structure is characterized in that an oil box groove is formed in the top wall of the motor cabinet, a lubricating oil box is installed in the oil box groove, a lower oil hole communicated with the shaft hole is formed in the bottom wall of the oil box groove, an insertion pipe is installed at the top end of the lower oil hole, an impeller groove is formed in the top wall of the cooling cavity, an impeller extending to the inside of the cooling cavity is installed inside the impeller groove, a mounting opening is formed in the end wall of the motor chamber, a control valve for controlling the opening and closing of the lower oil hole is installed on the inner wall of the mounting opening, and the control valve is in transmission connection with the impeller.

When water flows in the cooling cavity, the water flow drives the impeller to rotate, the impeller is in transmission connection with the control valve, the control valve is driven to automatically operate, lubricating oil is controlled to be automatically released, manual operation is not needed, the cooling device is ingenious and convenient, friction between the motor shaft and the shaft hole is reduced, heat productivity in the shaft hole is reduced, and the working state of the device is improved. The automatic adding of lubricating oil is controlled through flowing water flow, the labor expenditure in equipment maintenance is saved, and the equipment stability is better.

Preferably, the cooling cavity is of an arc structure, the cooling cavity is wrapped on the outer side of the shaft hole, and the cooling cavity is divided into two parts which are symmetrically arranged on two sides of the lower oil hole.

The cooling chamber cladding nature of arc structure is better, can improve the thermal absorption efficiency to the shaft hole inside, and then improves the cooling effect, and the cooling chamber is divided into two symmetric distributions in oilhole both sides down, gives oilhole outflow space down, does not influence the normal drippage of lubricating oil.

Preferably, the lubricating oil box comprises a box body, the outer walls of the two sides of the box body are both connected with fixing plates, the fixing plates are fixedly attached to the outer wall of the motor base through bolts, an oil outlet is formed in the bottom end of the box body, and a rubber plug is mounted on the oil outlet.

The detachable installation has been carried out lubricating oil box, makes things convenient for the additive lubricating oil to the simple operation pours into lubricating oil into from the plug of bottom and can supplements, makes the intubate run through the plug and can make lubricating oil flow down smoothly through the intubate and add when the installation, convenience when having improved equipment usage.

Preferably, the top end of the box body is connected with a piston cylinder, a piston is arranged in the piston cylinder in a matching mode, and a pressurizing spring is connected between the inner top wall of the piston cylinder and the piston.

Set up pressure spring roof pressure piston all the time, can exert atmospheric pressure for the box body and make lubricating oil discharge, avoid lubricating oil to discharge the unable exhaust condition of remaining lubricating oil that leads to of atmospheric pressure reduction in the box body behind some, improved the stability of equipment during operation, it is more convenient to use.

Preferably, the control valve includes that the level is inserted and is established the valve plate on the inner wall of installing port, the valve opening has been seted up on the valve plate, the inside of motor cabinet is seted up with the board groove of valve plate adaptation, install the reset spring who is connected with the valve plate on the end wall of board groove, the bevel connection has been seted up to the tip of valve plate, the control valve is still including rotating the big belt pulley of installing on the installing port inner wall, install the driving lever of mutually supporting with the valve plate on the big belt pulley, and when the bevel connection on the valve plate is swept to the driving lever, reset spring compresses.

When big belt pulley rotated, the oblique mouth of driving lever repeatedly extrusion valve plate tip, the driving lever extrusion valve plate can make the valve plate retreat backward, and the valve opening on the valve plate then can with oilhole intercommunication down, make lubricating oil drip to discharge lubricate the motor shaft in the shaft hole, when the driving lever left the valve plate, received reset spring's restoring force, the valve plate resets, and the oilhole under the valve opening mistake made oilhole recovery closed state down, blockked the lubricating oil drip. Simple structure is ingenious, has realized the automatic interpolation to lubricating oil, has saved the maintenance expenditure, and is high-efficient convenient.

Preferably, the inner wall of the mounting hole is provided with a small belt pulley which is coaxially connected with the impeller, and the small belt pulley is in transmission connection with the large belt pulley through a belt.

The small belt pulley which is coaxially connected with the impeller drives the large belt pulley to rotate, so that the power of water flow is transmitted to the large belt pulley, and the automatic addition of lubricating oil is realized. Through designing the size of belt wheel and big belt wheel, can make the rotational speed reduce, and then reduce the frequency of adding of lubricating oil, avoid the frequency of lubricating oil dropwise add to lead to the fact the waste too fast.

Preferably, the impeller is accommodated in the impeller groove in half.

Half of impeller is located the cooling chamber, can make the impeller steady rotation, and one side atress of impeller then the irregular condition of rotation can not appear, has improved the stability of equipment during operation.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the cooling cavity is arranged on the outer side of the shaft hole to cool the motor shaft, water flow is introduced from the water inlet pipe and discharged into the water outlet pipe to flow out, so that the water flow in the cooling cavity is kept flowing all the time, the heat in the shaft hole can be taken away quickly and stably, the cooling effect is improved, and the working state of the equipment is further ensured.

2. The lubricating oil box is installed on the motor base, the water flow in the cooling cavity drives the control valve to control the lubricating oil to automatically drip, the lubricating effect in the shaft hole is improved, and the friction of the motor shaft is reduced, so that the abrasion and the heat productivity of the motor shaft are reduced, the working state of the equipment is further improved, manual addition is not needed, and the motor base is ingenious and convenient.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a front cross-sectional view of the present invention;

FIG. 3 is a right side schematic view of the present invention;

FIG. 4 is a top view of the present invention;

FIG. 5 is an enlarged view of the structure at A of the present invention;

FIG. 6 is an enlarged view of the structure of the present invention at B;

FIG. 7 is an enlarged view of the structure of the present invention at C;

FIG. 8 is an enlarged view of the structure of the present invention at D;

fig. 9 is a schematic view of the structure of the valve plate of the present invention.

In the figure: 1. a base; 2. a pump body; 3. a motor base; 4. a water inlet pipe; 5. a water outlet pipe; 6. a first cooling pipe; 7. a second cooling pipe; 8. a lubricating oil cartridge; 801. a box body; 802. a piston cylinder; 803. a piston; 804. a pressurizing spring; 805. a rubber plug; 806. a fixing plate; 9. a motor chamber; 10. a shaft hole; 11. a cooling chamber; 12. a communicating hole; 13. an impeller; 14. an impeller groove; 15. an installation port; 16. a small belt pulley; 17. a belt; 18. a large belt pulley; 19. a deflector rod; 20. a valve plate; 21. a valve bore; 22. a lower oil hole; 23. a return spring; 24. and (4) inserting a tube.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 9, the present invention provides a reciprocating centrifugal water pump, which has the following technical scheme:

the utility model provides a reciprocating circulation's centrifugal water pump, pump body 2 on base 1 and the base 1, one side of the pump body 2 is connected with motor cabinet 3, the both sides of the pump body 2 are equipped with inlet tube 4 and outlet pipe 5 respectively, motor cabinet 3 keeps away from the one end of the pump body 2 and has seted up motor room 9, set up the shaft hole 10 with the intercommunication of the pump body 2 on the end wall of motor room 9, the cooling chamber 11 that is located the shaft hole 10 outside is seted up to the inside of motor cabinet 3, install respectively on the outer wall of motor cabinet 3 both sides with the first cooling tube 6 of inlet tube 4 intercommunication and with the second cooling tube 7 of outlet pipe 5 intercommunication, the tip that first cooling tube 6 extends to the inside of inlet tube 4 and first cooling tube 6 is towards the opening part of inlet tube 4, all set up the intercommunicating pore 12 with cooling chamber 11 intercommunication on the outer wall of motor cabinet 3 both sides, and two intercommunicating pores 12 communicate with first cooling tube 6 and second cooling tube 7 respectively.

When the centrifugal pump begins to work, rivers enter the pump body 2 from inlet tube 4, and discharge from outlet pipe 5, a part of rivers pass through first cooling tube 6 and get into cooling chamber 11, and follow the discharge in discharging pipe 5 from second cooling tube 7, rivers in the cooling chamber 11 keep flowing, the heat that produces in the shaft hole 10 is in time absorbed and taken away, make the inside temperature environment that is in suitable all the time in shaft hole 10, avoid the motor shaft to be in under the too high operating temperature, improve equipment's operating condition, cooling method for present stage is more high-efficient, help improving equipment's life.

Seted up the oil box groove on motor cabinet 3's the roof, oil box installs lubricating oil box 8 in the groove, set up the lower oilhole 22 with shaft hole 10 intercommunication on the diapire of oil box groove, intubate 24 is installed on the top of lower oilhole 22, it has impeller groove 14 to set up on the roof of cooling chamber 11, the internally mounted of impeller groove 14 has the impeller 13 that extends to cooling chamber 11 inside, install installing port 15 on the end wall of motor room 9, install the control valve of the switching of oilhole 22 under the control on the inner wall of installing port 15, the control valve is connected with impeller 13 transmission.

When water flows in the cooling cavity 11, the water flow drives the impeller 13 to rotate, the impeller 13 is in transmission connection with the control valve, the control valve is enabled to automatically operate, and then automatic release of lubricating oil is controlled, manual operation is not needed, the device is ingenious and convenient, friction between the motor shaft and the shaft hole 10 is reduced, heat productivity in the shaft hole 10 is reduced, and the working state of the device is improved. The automatic adding of lubricating oil is controlled through flowing water flow, the labor expenditure in equipment maintenance is saved, and the equipment stability is better.

Referring to fig. 3, the cooling cavity 11 has an arc-shaped structure, the cooling cavity 11 is wrapped outside the shaft hole 10, and the cooling cavity 11 is divided into two parts and symmetrically disposed at two sides of the lower oil hole 22.

The cooling chamber 11 cladding nature of arc structure is better, can improve the thermal absorption efficiency to shaft hole 10 inside, and then improves the cooling effect, and cooling chamber 11 is divided into two symmetric distributions in oilhole 22 both sides down, gives oilhole 22 outflow space down, does not influence the normal drippage of lubricating oil.

Referring to fig. 5, the lubricating oil box 8 includes a box body 801, fixing plates 806 are connected to outer walls of two sides of the box body 801, the fixing plates 806 are fixedly attached to an outer wall of the motor base 3 through bolts, an oil outlet is formed in the bottom end of the box body 801, and a rubber plug 805 is mounted on the oil outlet.

Removable installation has been carried out lubricating oil box 8, conveniently adds lubricating oil to the simple operation pours into lubricating oil into from the plug 805 of bottom and can supplements, makes intubate 24 run through plug 805 in the installation and can make lubricating oil flow down smoothly through intubate 24 and add, convenience when having improved equipment and using.

Referring to fig. 5, a piston cylinder 802 is connected to the top end of a case 801, a piston 803 is disposed inside the piston cylinder 802, and a pressurizing spring 804 is connected between the inner top wall of the piston cylinder 802 and the piston 803.

The pressurizing spring 804 is arranged to always press the piston 803, so that air pressure can be applied to the box body 801 to enable the lubricating oil to be discharged, the situation that the residual lubricating oil cannot be discharged due to the fact that the air pressure in the box body 801 is reduced after a part of the lubricating oil is discharged is avoided, the working stability of the equipment is improved, and the use is more convenient.

Referring to fig. 7 and 8, the control valve includes a valve plate 20 horizontally inserted on the inner wall of the mounting port 15, the valve plate 20 is provided with a valve hole 21, the motor base 3 is internally provided with a plate groove adapted to the valve plate 20, the end wall of the plate groove is provided with a return spring 23 connected to the valve plate 20, the end of the valve plate 20 is provided with a bevel, the control valve further includes a large belt pulley 18 rotatably mounted on the inner wall of the mounting port 15, the large belt pulley 18 is provided with a shift lever 19 mutually matched with the valve plate 20, and the return spring 23 is compressed when the shift lever 19 sweeps across the bevel on the valve plate 20.

When the big belt pulley 18 rotates, the deflector rod 19 repeatedly extrudes the bevel connection at the end part of the valve plate 20, the deflector rod 19 extrudes the valve plate 20 to enable the valve plate 20 to retreat backwards, the valve hole 21 on the valve plate 20 is communicated with the oil dropping hole 22, lubricating oil is dripped and discharged into the shaft hole 10 to lubricate a motor shaft, when the deflector rod 19 leaves the valve plate 20, the deflector rod receives the reset force of the reset spring 23, the valve plate 20 resets, the valve hole 21 staggers the oil dropping hole 22 to enable the oil dropping hole 22 to recover a closed state, and the lubricating oil is prevented from dripping. Simple structure is ingenious, has realized the automatic interpolation to lubricating oil, has saved the maintenance expenditure, and is high-efficient convenient.

Referring to fig. 7, a small pulley 16 coaxially connected to the impeller 13 is mounted on an inner wall of the mounting opening 15, and the small pulley 16 and a large pulley 18 are drivingly connected by a belt 17.

The small belt pulley 16 coaxially connected with the impeller 13 drives the large belt pulley 18 to rotate, so that the power of water flow is transmitted to the large belt pulley 18, and the automatic addition of lubricating oil is realized.

It should be noted that, by designing the sizes of the small belt pulley 16 and the large belt pulley 18, the rotation speed can be reduced to a proper level, so as to reduce the adding frequency of the lubricating oil and avoid waste caused by too fast dropping frequency of the lubricating oil. In addition, the size of the valve hole 22 is designed to reduce the volume of the lubricating oil dropped once, thereby reducing waste, and the lubricating oil can be prevented from flowing out even if the adding speed and the consumption speed of the lubricating oil are equal.

Referring to fig. 6, as an embodiment of the present invention, half of the impeller 13 is housed in the impeller groove 14. Half of impeller 13 is located cooling chamber 11, can make impeller 13 steady rotation, and one side atress of impeller 13 then can not appear rotating irregular condition, has improved the stability of equipment during operation.

The working principle is as follows: when the centrifugal pump starts to work, water flow enters the pump body 2 from the water inlet pipe 4 and is discharged from the water outlet pipe 5, a part of water flow enters the cooling cavity 11 through the first cooling pipe 6 and is discharged into the water outlet pipe 5 from the second cooling pipe 7 along with the water flow, the water flow in the cooling cavity 11 keeps flowing, heat generated in the shaft hole 10 is absorbed and taken away in time, when the water flow passes through the cooling cavity 11, the impeller 13 is driven to rotate, the small belt pulley 16 coaxially connected with the impeller 13 drives the large belt pulley 18 to rotate, when the large belt pulley 18 rotates, the deflector rod 19 repeatedly extrudes an inclined port at the end part of the valve plate 20, the deflector rod 19 extrudes the valve plate 20 to enable the valve plate 20 to retract backwards, the valve hole 21 on the valve plate 20 is communicated with the lower oil hole 22, and lubricating oil is dripped and discharged into the shaft hole 10 to lubricate a motor shaft.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.