CN203978848U - Long life brushless DC water pump - Google Patents

Abstract

The utility model discloses a long-life brushless DC water pump, which comprises a pump shell, a front end cover, a rear end cover, a rotor, a stator and a baffle frame, wherein the stator is arranged in a stator cavity of the pump shell, the rotor is arranged in a rotor cavity of the pump shell through a graphite shaft sleeve, and a cooling opening which exposes the shaft sleeve and a rotating shaft of the rotor is arranged at the bottom of the rotor cavity; the utility model has the advantages of reasonable structural design, skillfully arranging the cooling opening on the rotor cavity, enabling liquid to enter between the shaft sleeve and the rotating shaft of the rotor for lubrication and cooling, effectively reducing friction and loss, further prolonging the service life, having good working stability, selecting the graphite shaft sleeve at both ends, having good lubricating effect, further reducing friction, thereby reducing vibration and noise, having more stable and reliable work and high efficiency; in addition, the water outlet and the water inlet are arranged on the same axis, so that water inlet and outlet are smooth, the water supply effect is improved, the installation and the use are convenient, the water supply device can be assembled on certain occasions, and different installation and use requirements are met.

Description

Long life brushless DC water pump

technical field

The utility model relates to the technical field of water pumps, in particular to a long-life brushless DC water pump.

Background technique

A pump is a machine that transports or pressurizes a liquid. It transmits the mechanical energy of the prime mover or other external energy to the liquid to increase the energy of the liquid. It is mainly used to transport liquids including water, oil, acid and alkali, emulsions, suspoemulsions and liquid metals, etc., and can also transport liquid and gas mixtures. and liquids containing suspended solids.

The shaft sleeves in the existing brushless DC water pumps are all sealed in the rotor cavity, and the liquid cannot enter between the shaft sleeves and the rotating shaft of the rotor for lubrication and cooling. The force is large, causing unnecessary energy loss, and in severe cases, the phenomenon of jamming will occur, which will cause the water pump to fail to work normally and greatly shorten the service life of the water pump.

Utility model content

In view of the above deficiencies, the purpose of this utility model is to provide an ingenious and reasonable structural design, which can allow liquid to enter between the shaft sleeve and the rotating shaft of the rotor for lubrication and cooling, and has good operation stability and long service life. Brushless DC water pump.

In order to achieve the above purpose, the technical solution provided by the utility model is: a long-life brushless DC water pump, which includes a pump casing, a front end cover, a rear end cover, a rotor, a stator and a retaining frame. The middle position is inwardly recessed to form a rotor chamber for setting the rotor, and the rear end surface of the pump casing is inwardly recessed corresponding to the peripheral position of the rotor chamber to form a stator chamber for setting the stator, and the stator is arranged in the stator chamber , the rotor is set in the rotor cavity through the shaft sleeve, and a cooling opening is provided at the bottom of the rotor cavity to expose the shaft sleeve and the rotating shaft of the rotor, the impeller is arranged on the rotating shaft of the stator, the front end cover and the rear end The covers fit over both ends of the pump casing accordingly.

As an improvement of the utility model, the bushing is a graphite bushing. Graphite bushing is used, which has a good lubricating effect, can effectively reduce friction and improve work efficiency.

As an improvement of the utility model, the impeller is a closed impeller, which can effectively increase the head of the water pump.

As an improvement of the utility model, the front end cover is provided with a water inlet, and the rear end cover is provided with a water outlet, and the water outlet and the water inlet are on the same axis. Not only the water in and out is smooth, but also the water supply effect is improved, and the installation and use are convenient, which can be suitable for assembly in some occasions and meet different installation and use requirements.

The beneficial effects of the utility model are: the utility model has a reasonable structural design, and a cooling opening is ingeniously provided on the rotor cavity, allowing liquid to enter between the shaft sleeve and the rotating shaft of the rotor for lubrication and cooling, with small friction and low loss, ensuring Normal operation, good working stability, effectively prolonging the service life. Moreover, graphite bushings are used at both ends, which has a good lubricating effect and further reduces friction, thereby reducing vibration and noise, making the operation more stable and reliable, and the work efficiency is high; in addition, the water outlet and the water inlet are on the same axis , not only the water in and out is smooth, and the water supply effect is improved, but also easy to install and use, suitable for assembly in certain occasions, meeting different installation and use requirements, and conducive to widespread popularization and application.

Below in conjunction with accompanying drawing and embodiment, the utility model is further described.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present utility model.

FIG. 2 is a schematic diagram of a full cross-section of FIG. 1 .

FIG. 3 is a schematic diagram of an exploded structure of FIG. 1 .

FIG. 4 is a second schematic diagram of the exploded structure of FIG. 1 .

Detailed ways

Referring to Figures 1 to 4, a long-life brushless DC water pump provided in this embodiment includes a pump casing 1, a front end cover 2, a rear end cover 3, a rotor 4, a stator 5 and an impeller 6, and the pump casing 1 The middle position of the front end face is inwardly recessed to form a rotor chamber for setting the rotor 4, and the rear end face of the pump casing 1 is inwardly recessed corresponding to the peripheral position of the rotor chamber to form a stator chamber for setting the stator 5. The stator 5 is set in the stator cavity, and then the opening of the stator cavity is closed, and the rotor 4 is set in the rotor cavity through the shaft sleeve 9, and the bottom of the rotor cavity is provided with a shaft sleeve 9 and the shaft of the rotor 4 are exposed. The cooling opening 10, the bushing 9 is preferably a graphite bushing. It has good lubricating effect, can effectively reduce friction and improve work efficiency. The impeller 6 is arranged on the rotating shaft of the stator. The front end cover 2 and the rear end cover 3 are respectively covered on both ends of the pump casing 1 .

Preferably, a retainer 7 is also included, and the retainer 7 is arranged on the opening of the rotor cavity, which can prevent large particles of foreign matter from entering between the rotor and the stator, and avoid blocking the rotor, thereby ensuring normal operation and stable operation Good performance, further prolonging the service life. Specifically, the stop frame 7 includes a circular body 71, the center of which is provided with a shaft hole, and the shaft hole is provided with a graphite shaft sleeve 51 adapted to the rotating shaft of the stator 5, The bottom surface of the inner cavity of the rotor cavity is provided with a shaft sleeve 9 adapted to the rotating shaft of the stator 5, and similarly, the shaft sleeve 9 is preferably a graphite shaft sleeve. Graphite bushing is used, which has a good lubricating effect, can effectively reduce friction and improve work efficiency. The periphery of the circular body 71 is symmetrically provided with a plurality of fixed connecting rods 72 , and the pump housing 1 is provided with positioning installation grooves 11 matching the fixed connecting rods 72 . The number of fixed connecting rods 72 is preferably four. During installation, the fixed connecting rod 72 can be aligned with the positioning installation groove 11, then placed in the positioning installation groove 11, and pasted and fixed by glue, so that it can be positioned and fixed on the opening of the rotor cavity. More preferably, a notch 73 can also be provided on the circular body 71 corresponding to the position between two adjacent fixed connecting rods 72 . A gap 73 is provided to allow water to enter for cooling while preventing the entry of large particles of foreign matter, further ensuring the stability of operation and prolonging the service life.

In this embodiment, the impeller 6 is preferably a closed impeller, which can effectively increase the head of the water pump. In other embodiments, other types of open impellers, semi-open impellers, etc. may be used.

The front end cover 2 is provided with a water inlet 21 , and the rear end cover 3 is provided with a water outlet 31 , and there is an axial gap between the outer wall of the rotor chamber and the inner wall of the pump casing 1 to form a water channel 8 . Preferably, the water outlet 31 and the water inlet 21 are on the same axis. That is, the angle between the water outlet 31 and the water inlet 21 is 180 degrees, not only the water in and out is smooth, and the water supply effect is improved, but also easy to install and use, suitable for assembly in certain occasions, and meet different installation and use requirements. For the convenience of installation, an internal thread can be provided on the water inlet 21, and an external thread can be provided on the water outlet 31, which is convenient for quick installation and use during use, and greatly improves work efficiency. The cooling opening 10 is also on the same axis as the water outlet 31 and the water inlet 21 .

When working, turn on the power, the rotor 4 drives the impeller 6 to rotate, the liquid enters the pump casing 1 through the water inlet 21, and flows out from the water outlet 31 through the water channel 8 quickly. At the same time, part of the liquid can enter between the shaft sleeve 9 and the rotating shaft of the rotor 4 through the cooling opening 10 to achieve the purpose of lubrication and cooling, effectively ensure the stability of the work and prolong the service life. And when there are large particles of foreign matter entering the pump housing 1 from the water inlet 21, under the blocking effect of the retaining frame 7, the large particles of foreign matter are effectively prevented from entering between the rotor 4 and the stator, ensuring normal operation and further prolonging the service life. Preferably, the control method of the long-life brushless DC water pump of the utility model adopts a brushless and sensorless control mode, which is back electromotive force control technology. The analog electronic circuit is used to test its back electromotive force. Its advantage is that three position sensors are omitted, which makes the structure of the long-life brushless DC water pump simple and suitable for long-term stable operation. This control method also increases the protection of the long-life brushless DC water pump under different working conditions, such as high pressure, low pressure, overcurrent, overheating, water shortage, time delay, etc.

According to the disclosure and teaching of the above specification, those skilled in the art to which the present utility model belongs can also change and modify the above embodiment. Therefore, the utility model is not limited to the specific implementation manners disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this description, these terms are only for convenience of description, and do not constitute any limitation to the present invention. The use of other water pumps that are the same as or similar to them are all within the protection scope of the present invention.

Claims (4)

1. a long lifetime brushless direct-current water pump, it is characterized in that, it comprises pump case, front cover, rear end cover, rotor, stator and divider, the front-end face neutral position of described pump case inwardly concaves and forms a rotor chamber that is used for arranging rotor, the peripheral position in the ear end face respective rotor chamber of this pump case inwardly concaves and forms a stator cavity that is used for arranging stator, described stator arranges in this stator cavity, described rotor arranges in rotor chamber by axle sleeve, and be provided with the cooling opening that the rotating shaft of axle sleeve and rotor is exposed in the bottom of this rotor chamber, impeller is arranged in the rotating shaft of stator, described front cover and rear end cover corresponding lid are combined in the two ends of pump case.

2. long lifetime brushless direct-current water pump according to claim 1, is characterized in that: described axle sleeve is graphite bushing.

3. long lifetime brushless direct-current water pump according to claim 1 and 2, is characterized in that: described impeller is double shrouded wheel.

4. long lifetime brushless direct-current water pump according to claim 1 and 2, is characterized in that: described front cover is provided with water intake, and described rear end cover is provided with water outlet, and this water outlet and described water intake are on same axis.