Micro water path structure of deep well pump and motor lower bearing

Abstract

The application provides a micro-water path structure of a motor lower bearing, a motor shaft is vertically arranged in the motor, the motor has a fluid passage connected to a lower end of the motor shaft; a support bearing is arranged at the lower end of the motor to support the motor shaft, and a fluid branch connected to the fluid passage is arranged between the support bearing and a sleeving end surface of the motor shaft. In the working process of the deep-well pump, the vertically arranged motor shaft drives the impeller to rotate to realize fluid delivery, the fluid passage is arranged in the motor, the lower end of the motor shaft is supported to rotate by the support bearing, the fluid in the fluid passage cools the support bearing in the flowing process, and the support bearing and the motor shaft rotate relatively, the fluid branch is arranged on the inner wall of the support bearing, and the motor shaft is cooled by the fluid branch in the flowing process, so that the cooling effect between the support bearing and the motor shaft is improved, and the working safety of the deep-well pump is improved. The application further provides a deep-well pump.

Description

Technical Field

[0001] The present invention relates to the technical field of deep well pumps, and more particularly to a deep well pump and a micro-water channel structure of a lower bearing of a motor. Background Art

[0002] A deep well pump comprises a motor and a pump body, which are axially connected as a whole and are used to pump and transport water in a deep well.

[0003] Deep-well pumps are widely used in agricultural irrigation, industrial and mining operations, urban water supply and drainage, and sewage treatment. Because they operate deep underground, they are subject to significant water pressure. Deep-well pumps require external cables for adjustment and control of their operating state. Therefore, the sealing capability of the connection between the external cables and the internal controller affects the safety of the electrical components within the deep-well pump.

[0004] Therefore, how to improve the sealing performance of the connection between the deep well pump and the external cable is a problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a micro-water channel structure of a motor lower bearing to improve the cooling capacity of the motor shaft end; the present invention also provides a deep well pump.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A micro-water channel structure for a lower bearing of a motor, wherein the motor has a vertically arranged motor shaft built into the motor, and the motor has a fluid channel connected to the lower end of the motor shaft;

[0008] A support bearing for supporting the motor shaft is provided at the lower end of the motor, and a fluid branch connected to the fluid passage is provided between the support bearing and the sleeve end surface of the motor shaft.

[0009] Preferably, in the micro-water channel structure of the lower bearing of the motor, the support bearing includes a first bearing provided at the end of the motor shaft, and a second bearing provided inside the first bearing.

[0010] The first bearing is a graphite bearing, and the fluid branch includes a liquid inlet channel provided on the inner wall surface of the graphite bearing.

[0011] Preferably, in the micro-water channel structure of the above-mentioned motor lower bearing, the second bearing is a ceramic bearing pressed against the axial end of the graphite bearing, and the fluid branch includes a liquid outlet channel extending from the press-fit end surfaces of the graphite bearing and the ceramic bearing.

[0012] Preferably, in the micro-water channel structure of the motor lower bearing, the liquid inlet channel includes a plurality of liquid inlet channels that surround the inner wall surface of the graphite bearing and are evenly distributed along the axial direction thereof.

[0013] Preferably, in the micro-water channel structure of the above-mentioned motor lower bearing, the liquid inlet channel includes three channels surrounding the inner wall surface of the graphite bearing.

[0014] Preferably, in the micro-water channel structure of the motor lower bearing, the liquid outlet channel is provided on the ceramic bearing and extends from the radial inner side to the outer side of the ceramic bearing;

[0015] The liquid outlet channels include three evenly distributed channels.

[0016] Preferably, in the micro-water channel structure of the motor lower bearing, the motor includes a motor body, a lower end cover provided at the bottom of the motor body, a lower support seat extending from the lower end cover for supporting the lower end of the motor shaft, and the first bearing is fixedly mounted in the lower support seat;

[0017] The lower end of the motor shaft has a step structure, an upper support seat is installed at the upper limit position of the step structure, and the second bearing is embedded in the upper support seat.

[0018] Preferably, in the micro-water channel structure of the above-mentioned motor lower bearing, the upper end surface of the first bearing extends out of the lower support seat, and the lower end of the second bearing extends out of the upper support seat.

[0019] Preferably, in the micro-water channel structure of the motor lower bearing, a shielding shell for shielding the motor stator and the motor rotor is provided in the motor body, and the fluid passage includes a transverse channel connected from the outer ring of the lower support seat to the lower end of the motor shaft.

[0020] The axial channel of the motor shaft is connected to the vertical channel between the motor shaft and the shielding shell;

[0021] A return channel connecting the transverse channel and the vertical channel is provided between the lower support seat and the shielding shell;

[0022] The liquid outlet channel faces a junction of the vertical channel and the return channel.

[0023] A deep well pump comprises an impeller guide part and a motor arranged at the lower end of the impeller guide part, wherein the fluid passage arranged in the motor has the micro-water channel structure of the motor lower bearing as described in any one of the above items.

[0024] The present invention provides a micro-water channel structure for the lower bearing of the motor. The motor has a vertically arranged motor shaft built into the motor. The motor has a fluid channel connected to the lower end of the motor shaft. The lower end of the motor is provided with a support bearing for supporting the motor shaft. A fluid branch connected to the fluid channel is provided between the sleeve end faces of the support bearing and the motor shaft. When the deep-well pump is working, the vertically arranged motor shaft drives the impeller to rotate to achieve fluid transportation. A fluid channel is provided inside the motor. The lower end of the motor shaft is supported by the support bearing for rotation. During the flow of fluid in the fluid channel, the support bearing is cooled. There is relative rotation between the support bearing and the motor shaft. A fluid branch is provided on the inner wall of the support bearing. During the flow of fluid, the motor shaft is cooled through the fluid branch to improve the cooling effect between the support bearing and the contact end face of the motor shaft, thereby improving the working safety of the deep-well pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of the arrangement of the micro-water channel structure of the lower bearing of the motor provided by the present invention;

[0027] Figure 2 for Figure 1 A partial enlarged view of the micro-water channel structure of the lower bearing of the middle motor;

[0028] Figure 3 for Figure 2 A partial enlarged view of point A in the micro-water channel structure of the lower bearing of the middle motor. DETAILED DESCRIPTION

[0029] The invention discloses a micro-water channel structure of a motor lower bearing, which improves the cooling capacity of the motor shaft end; the invention also provides a deep well pump.

[0030] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] like Figure 1-Figure 3 As shown, Figure 1 A schematic diagram of the arrangement of the micro-water channel structure of the lower bearing of the motor provided by the present invention; Figure 2 for Figure 1 A partial enlarged view of the micro-water channel structure of the lower bearing of the middle motor; Figure 3 for Figure 2 A partial enlarged view of point A in the micro-water channel structure of the lower bearing of the middle motor.

[0032] This embodiment provides a micro-water channel structure for the lower bearing of a motor. The motor 1 has a vertically arranged motor shaft 2 built in. The motor 1 has a fluid passage 3 connected to the lower end of the motor shaft 2. The lower end of the motor 1 is provided with a support bearing 4 for supporting the motor shaft. A fluid branch connected to the fluid passage is provided between the support bearing 4 and the sleeve end face of the motor shaft 2. When the deep well pump is working, the vertically arranged motor shaft 2 drives the impeller to rotate to achieve fluid transportation. The fluid passage 3 is provided inside the motor 1. The lower end of the motor shaft 2 is supported by the support bearing 4 for rotation. During the flow of fluid in the fluid passage 3, the support bearing 4 is cooled. There is relative rotation between the support bearing 4 and the motor shaft 2. A fluid branch is provided on the inner wall of the support bearing 4. During the flow of fluid, the support bearing 4 at the bottom of the motor shaft 2 is cooled through the fluid branch to improve the cooling effect between the support bearing 4 and the contact end face of the motor shaft 2, thereby improving the working safety of the deep well pump.

[0033] In one embodiment of this invention, the support bearing 4 includes a first bearing 41 disposed at the end of the motor shaft 2 and a second bearing 42 disposed inside the first bearing 41. The first bearing 41 is a graphite bearing, and the fluid branch includes a liquid inlet channel 43 disposed on the inner wall of the graphite bearing. The support bearing 4 provides bearing support for the motor shaft 2 and simultaneously rotates relative to the motor shaft 2.

[0034] The lower end of the motor 1 is the lower end cover 5, on which is arranged a lower support seat 51 for supporting the first bearing 41. The first bearing 41 is fixedly mounted in the lower support seat 51. The motor shaft 2 is also fitted with a second bearing 42, which abuts against the first bearing 41 in the axial direction. The second bearing 42 is fixedly mounted on the motor shaft 2, and the first bearing 41 is fixedly mounted on the lower support seat 51. When the motor shaft 2 rotates, the second bearing 42 is driven to rotate, and the second bearing 42 rubs against the first bearing 41 between the shaft end. The first bearing 41 is provided with a graphite bearing to improve the rotational stability and smoothness between the motor shaft 2 and the first bearing 41. At the same time, a fluid branch is provided on the inner wall of the graphite bearing, located between the motor shaft 2 and the graphite bearing, for cooling.

[0035] Second bearing 42 is a ceramic bearing pressed against the axial end of the graphite bearing. The fluid branch includes a liquid outlet channel 44 extending from the pressed end surfaces of the graphite and ceramic bearings. First bearing 41 and second bearing 42 abut against each other axially. The first bearing 41 provides radial support between motor shaft 2 and lower support seat 51, while first bearing 41 and second bearing 42 provide axial support, improving the local support stability of the lower end of motor shaft 2.

[0036] The second bearing 42 is a ceramic bearing, and the ceramic bearing and the graphite bearing are in frictional contact, which improves the wear resistance of the two for supporting the motor shaft and improves long-term working stability.

[0037] The fluid branch flows in from the lower end of the first bearing 41, flows through the liquid inlet channel 43 to the contact end surface of the first bearing 41 and the second bearing 42, and a radially extending liquid outlet channel 44 is provided on the lower end surface of the ceramic bearing, that is, its press-fit end surface to the graphite bearing.

[0038] By arranging the liquid inlet channel 43 and the liquid outlet channel 44 on different first bearings 41 and second bearings 42, while the two rotate relative to the motor shaft 2, the lubricating fluid is simultaneously filled onto the contact end surfaces of the three, forming a rotating water film, thereby improving the rotational lubrication, and when the liquid inlet channel 43 and the liquid outlet channel 44 are connected, the fluid branch is connected to form a micro-water channel cooling structure.

[0039] In one embodiment of this invention, the liquid inlet channel 43 comprises multiple channels evenly distributed along the inner wall of the graphite bearing. Specifically, the liquid outlet channel 44 is provided on the ceramic bearing and extends from the radially inner side to the radially outer side of the ceramic bearing. The liquid outlet channel 44 comprises three channels evenly distributed along the inner wall.

[0040] Preferably, the liquid inlet channel 43 includes three branches surrounding the inner wall of the graphite bearing. The three fluid branches include three liquid inlet channels 43 and three liquid outlet channels 44. When the fluid branches are connected, they are evenly arranged at an angle of 120 degrees.

[0041] In one embodiment of this invention, the motor body 1 is comprised of a lower end cap 5 disposed at the bottom of the motor body 1. A lower support seat 51 extends from the lower end cap 5, supporting the lower end of the motor shaft 2. A first bearing 41 is securely mounted within the lower support seat 51. The lower end of the motor shaft 2 has a stepped structure, with an upper support seat 13 mounted at the upper limit of the stepped structure. A second bearing 42 is embedded within the upper support seat 13. The motor is located below the impeller guide portion, with the output end of the motor shaft 2 located above it. A support structure is provided within the motor body 1 to support the top of the motor shaft 2.

[0042] The motor shaft 2 is arranged vertically, with its bottom providing both rotational and axial support. A lower end cap 5 is mounted on the lower end of the motor body 1 to support and seal the motor body 1. A lower support seat 51 is located within the lower end cap 5. A bearing hole is defined within the lower support seat 51. The first bearing 41 fits within the bearing hole and is fixedly connected to the lower support seat 51, providing a rotational engagement between the motor shaft 2 and the first bearing 41.

[0043] A step structure is provided on the motor shaft 2, and the upper support seat 13 is mounted on the motor shaft 2 and axially limited by the step structure. A bearing hole for fixing the second bearing 42 is provided on the upper support seat 13. After the first bearing 41 and the second bearing 42 are installed in place, the axial end faces of the first bearing 41 and the second bearing 42 are abutted and matched. The motor shaft 2 rotates, driving the second bearing 42 to rotate. The second bearing 42 and the first bearing 41 rotate relative to each other, providing axial support and rotational support at the same time.

[0044] In a specific embodiment of the present invention, the upper end surface of the first bearing 41 extends out of the lower support seat 51, and the lower end of the second bearing 42 extends out of the upper support seat 13. The lower support seat 51 is used to mount the first bearing 41 and provide axial support for the motor shaft 2. The second bearing 42 and the first bearing 41 rotate relative to each other. Fluid enters the liquid inlet channel 43 due to the pressure in the fluid passage and is discharged through the liquid outlet channel 44 on the second bearing 42. The upper end surface of the first bearing 41 is set higher than the upper end of the lower support seat 51, and the lower end surface of the second bearing 42 is set lower than the lower end of the upper support seat 13. This allows the fluid to be discharged directly into the rotor cavity, improving the convenience of fluid circulation.

[0045] like Figure 1 As shown, further, a shielding shell 11 for shielding the motor stator and the motor rotor is provided in the motor body 1, and the fluid passage includes a transverse channel 12 connected from the outer ring of the lower support seat 51 to the lower end of the motor shaft 2.

[0046] The axial channel of the motor shaft 2 is connected to the vertical channel 14 between the motor shaft 2 and the shielding shell 11;

[0047] A return channel 15 is provided between the lower support seat 51 and the shielding shell 11 to connect the horizontal channel 12 and the vertical channel 14;

[0048] The liquid outlet channel 44 faces the junction of the vertical channel 14 and the return channel 15 .

[0049] Fluid passages are commonly used in liquid environments for pumping water. The cooling fluid in the motor can be water or an injected cooling fluid. When the motor is working, the motor shaft 2 drives the rotor, rotating at high speed in the shielding shell 11. The fluid flows from the transverse channel 12 at the lower end of the motor shaft 2 into the lower support seat 51. The lower support seat 51 is connected to the axial channel inside the motor shaft 2. The fluid enters the top of the motor body through the axial channel and enters between the motor shaft 2 and the shielding shell 11 through the top outlet of the motor shaft 2. A vertical channel 14 is provided in the shielding shell 11. The fluid falls to the lower end of the motor shaft 2 through the vertical channel 14. Due to the support of the first bearing 41 and the second bearing 42, the flow area of ​​the return channel 15 at this position is smaller than the flow area of ​​the vertical channel 14 in the shielding shell 11. The fluid flows back to the transverse channel 12 through the return channel 15. The liquid outlet channel 44 is directed toward the junction of the reflux channel 15 and the vertical channel 14 , and the fluid discharged through the liquid outlet channel 44 merges with the fluid flowing out of the vertical channel 14 and flows into the transverse channel 12 , thus realizing the circulation of the micro-waterway.

[0050] Based on the micro-water channel structure of the motor lower bearing provided in the above embodiments, the present invention also provides a deep well pump, including an impeller guide part, and a motor arranged at the lower end of the impeller guide part. The fluid passage arranged in the motor has the micro-water channel structure of the motor lower bearing provided in the above embodiments.

[0051] Since the deep well pump adopts the micro-water channel structure of the motor lower bearing of the above embodiment, the beneficial effects brought about by the micro-water channel structure of the motor lower bearing of the deep well pump can be referred to the above embodiment.

[0052] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A micro-water channel structure of a motor lower bearing, characterized in that: For a deep well pump, the motor has a vertically arranged motor shaft, and the motor has a fluid passage connected to the lower end of the motor shaft; The lower end of the motor is provided with a support bearing for supporting the motor shaft, and a fluid branch connected to the fluid passage is provided between the support bearing and the sleeve end surface of the motor shaft; The support bearing includes a first bearing provided at the end of the motor shaft, and a second bearing provided inside the first bearing, wherein the second bearing is in abutment with the first bearing in the axial direction; The first bearing is a graphite bearing, and the fluid branch comprises a liquid inlet channel provided on the inner wall surface of the graphite bearing; The second bearing is a ceramic bearing pressed against the axial end of the graphite bearing, and the fluid branch comprises a liquid outlet channel extending from the press-fit end surfaces of the graphite bearing and the ceramic bearing.

2. The micro-water channel structure of the motor lower bearing according to claim 1, characterized in that: The liquid inlet channel includes a plurality of channels that surround the inner wall surface of the graphite bearing and are evenly distributed along the axial direction thereof.

3. The micro-water channel structure of the motor lower bearing according to claim 1, characterized in that: The liquid inlet channels include three channels surrounding the inner wall surface of the graphite bearing.

4. The micro-water channel structure of the motor lower bearing according to claim 2, characterized in that: The liquid outlet channel is provided on the ceramic bearing and extends from the radial inner side to the radial outer side of the ceramic bearing; The liquid outlet channels include three evenly distributed channels.

5. The micro-water channel structure of the motor lower bearing according to claim 4, characterized in that: The motor includes a motor body, a lower end cover provided at the bottom of the motor body, a lower support seat extending from the lower end cover for supporting the lower end of the motor shaft, and the first bearing is fixed in the lower support seat; The lower end of the motor shaft has a step structure, an upper support seat is installed at the upper limit position of the step structure, and the second bearing is embedded in the upper support seat.

6. The micro-water channel structure of the motor lower bearing according to claim 5, characterized in that: The upper end surface of the first bearing extends out of the lower support seat, and the lower end of the second bearing extends out of the upper support seat.

7. The micro-water channel structure of the motor lower bearing according to claim 6, characterized in that: A shielding shell for shielding the motor stator and the motor rotor is provided in the motor body, and the fluid passage includes a transverse channel connected from the outer ring of the lower support seat to the lower end of the motor shaft. The axial channel of the motor shaft is connected to the vertical channel between the motor shaft and the shielding shell; A return channel connecting the transverse channel and the vertical channel is provided between the lower support seat and the shielding shell; The liquid outlet channel faces a junction of the vertical channel and the return channel.

8. A deep well pump comprising an impeller guide portion and a motor provided at the lower end of the impeller guide portion, characterized in that: The fluid passage provided in the motor has the micro-water channel structure of the motor lower bearing as described in any one of claims 1 to 7.

Images