Water pump

Abstract

The utility model relates to a water pump which is provided with a volute, an impeller, a driving motor and a control unit. The driving motor comprises a first shell, an outer stator assembly and an inner rotor assembly; the control unit comprises a second machine shell, a PCBA board and a sealing cover. The volute is fixedly connected with one end of the first machine shell. A partition plate used for partitioning the internal space of the second machine shell is arranged in the second machine shell. The part of the second shell on one side of the partition plate is a press-fitting part, and the part on the other side of the partition plate is a mounting cavity part; one end of the mounting cavity away from the clapboard forms an opening; the PCBA board is fixedly arranged in the mounting cavity part; the sealing cover is fixedly arranged at the opening of the mounting cavity part and seals the mounting cavity part; a first bearing seat is arranged on the press-fitting part; a second bearing seat is arranged at one end, connected with the volute, of the first shell; the inner rotor assembly is rotationally arranged in the first machine shell through connection and cooperation of a rotating shaft of the inner rotor assembly and bearings arranged in the first bearing seat and the second bearing seat. A split type installation structure is adopted, so that later maintenance is facilitated.

Description

Technical Field

[0001] The utility model relates to a water pump. Background Art

[0002] As an indispensable fluid transportation device in the industrial and civil fields, the technology development and application of water pumps are extensive. The design and manufacture of water pumps need to consider multiple fields such as fluid mechanics, material science, and mechanical engineering to ensure their high efficiency, stability, and durability. Among the numerous factors affecting the performance of water pumps, the stability and durability of bearings are particularly crucial.

[0003] As one of the core components of a water pump, the performance of the bearing directly affects the operating efficiency and service life of the water pump. Bearing corrosion and damage are common causes of water pump failures, usually caused by the following factors: (1) Environmental factors: During the operation of the water pump, if it is in a humid, dusty, or corrosive gas-containing environment for a long time, the bearing surface is easily corroded, resulting in a decline in material properties. (2) Insufficient lubrication: The lubrication of the bearing is the key to ensuring its normal operation. Insufficient lubrication will cause an increase in bearing friction and temperature, and long-term operation is likely to cause bearing material fatigue and damage. (3) Overload operation: The water pump has a rated load-bearing capacity during design. If it operates under overload for a long time, the stress borne by the bearing exceeds the design limit, which will accelerate the wear and damage of the bearing. (4) Improper installation: The installation accuracy of the bearing is crucial for the stability of the water pump. Improper installation may cause uneven stress on the bearing and increase the risk of damage. (5) Material selection: The selection of bearing materials directly affects their corrosion resistance and wear resistance. If the material is selected improperly, it may not be able to adapt to a specific working environment, resulting in premature bearing failure.

[0004] When problems occur with the bearing, it is often necessary to repair the water pump. However, for existing water pumps during later maintenance and disassembly, due to their integral design, the later disassembly is very troublesome, and the replacement of its components (especially bearing replacement) is very troublesome. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a water pump, which adopts a split installation structure for easy later maintenance; at the same time, by using a graphite bearing, the influence of water on the bearing can be reduced, and the service life can be improved.

[0006] The technical solution for achieving the purpose of the present utility model is as follows: The present utility model has a volute, an impeller, a driving motor, and a control unit; the volute is provided with a liquid inlet, a liquid outlet, and a pump chamber; the impeller is in transmission connection with the output shaft of the driving motor; the impeller is located in the pump chamber and rotates in the pump chamber under the drive of the driving motor; the driving motor includes a first housing, an outer stator assembly, and an inner rotor assembly; the outer stator assembly is fixedly arranged in the first housing; the inner rotor assembly includes an inner rotor body fixedly provided with a rotating shaft; the inner rotor body is rotatably arranged in the first housing and forms a cooperation with the outer stator assembly; the control unit includes a second housing, a PCBA board, and a cover; the volute is fixedly connected to one end of the first housing and cooperates with one end of the first housing to form a pump chamber; a partition for separating the internal space is provided in the second housing; the part of the second housing on one side of the partition is a press-fitting part, and the part on the other side of the partition is an installation cavity part; an opening is formed at one end of the installation cavity part away from the partition; the PCBA board is fixedly arranged in the installation cavity part; the cover is fixedly arranged at the opening of the installation cavity part and closes the installation cavity part; a first bearing seat is provided on the press-fitting part; a second bearing seat is provided at the end of the first housing connected to the volute; the inner rotor assembly is rotatably arranged in the first housing through its rotating shaft and is connected and cooperated with bearings arranged in the first bearing seat and the second bearing seat.

[0007] Further, the bearings in the first bearing seat and the second bearing seat are graphite bearings; a plurality of chip removal grooves are provided on the circumferential inner wall of the through hole through which the rotating shaft passes in the graphite bearing, and the chip removal grooves are evenly distributed circumferentially along the axis of the through hole; the chip removal grooves extend along the axis of the through hole and extend from one end of the through hole to the other end.

[0008] Further, three wire passing through holes are provided on the partition; a sealing rubber pad is installed on the through hole; a puncture hole is provided on the sealing rubber pad;

[0009] It further includes three solder tabs; the solder tab includes a body; a plug-in body, a first welding body, and a second welding body are provided on the body; the plug-in body of the solder tab is inserted on the outer stator assembly; the three lead-out wires of the stator winding are respectively welded to the first welding body of a solder tab to form an electrical connection; the second welding body passes through the puncture hole and enters the installation cavity part, and is inserted into the corresponding welding hole on the PCBA board; the second welding body forms an electrical connection with the PCBA board through welding;

[0010] When the second welding body passes through the puncture hole, the puncture hole tightly wraps around the second welding body to form a sealed attachment.

[0011] Further, the first welding body is in a hook shape.

[0012] Further, a cable assembly is provided on the second housing; the cable assembly includes a rubber plug and a cable group; an installation groove communicating with the inside of the installation chamber is provided on the second housing; the rubber plug is plugged in the installation groove; the cable group passes through the wire passing hole on the rubber plug and then enters the installation chamber and forms an electrical connection with the PCBA board; at least one first pin shaft through hole is provided on the installation groove; a second pin shaft through hole is provided on the rubber plug; when the rubber plug is plugged in the installation groove, the first pin shaft through hole and the second pin shaft through hole are correspondingly matched to form a pin shaft hole; a pin shaft is inserted in the pin shaft hole; the second pin shaft through hole and the pin shaft form a tightly attached and clamped fit.

[0013] The utility model has positive effects: (1) The split installation structure adopted by the utility model is convenient for later maintenance, specifically the split design of the control unit.

[0014] (2) The graphite bearing adopted by the utility model is not easy to corrode and other problems under the influence of water, effectively improving the service life; at the same time, the graphite bearing is beneficial to discharging the graphite chips generated by friction during the operation of the primary inner rotor assembly through the chip removal groove.

[0015] (3) In the utility model, the solder tab can not only play the role of electrical connection between the stator winding and the PCBA board, but also the hook shape of its first welding body is convenient for winding the lead wire of the stator winding, thus facilitating the subsequent welding of the lead wire and the first welding body.

[0016] (4) In the utility model, the cable assembly is fixedly connected through the pin shaft, with a clever design and convenient and fast assembly. Description of the Drawings

[0017] In order to make the content of the utility model easier to be clearly understood, the following further details the utility model according to specific embodiments in conjunction with the drawings, where

[0018] Figure 1 is the structural schematic diagram of the utility model;

[0019] Figure 2 is the cross-sectional view of the utility model;

[0020] Figure 3 is the structural schematic diagram of the solder tab in the utility model;

[0021] Figure 4 is the structural schematic diagram of the bearing in the utility model;

[0022] Figure 5 is the installation schematic diagram of the cable assembly in the utility model. Detailed Description of the Embodiment

[0023] See Figures 1 to 5The utility model comprises a volute 1, an impeller 2, a drive motor 3 and a control unit 4; the volute 1 is provided with a liquid inlet 11, a liquid outlet 12 and a pump chamber 13; the impeller 2 is transmission-connected to the output shaft of the drive motor 3; the impeller 2 is located in the pump chamber 13 and rotates in the pump chamber 13 under the drive of the drive motor 3; the drive motor 3 includes a first casing 31, an outer stator assembly 32 and an inner rotor assembly 33; the outer stator assembly 32 is fixedly arranged in the first casing 31; the inner rotor assembly 33 includes an inner rotor body 332 fixedly provided with a rotating shaft 331; the inner rotor body 332 is rotatably arranged in the first casing 31 and cooperates with the outer stator assembly 32; the control unit 4 includes a second casing 41, a PCBA board 42 and a cover 43; the volute 1 is fixedly connected to one end of the first casing 31 and is connected to the outer stator assembly 32 of the first casing 31 One end cooperates to form a pump chamber 13; a partition 411 is provided in the second casing 41 for separating its internal space; the part of the second casing 41 located on one side of the partition 411 is a press-fitting part 412, and the part located on the other side of the partition 411 is a mounting cavity 413; an opening is formed at one end of the mounting cavity 413 away from the partition 411; the PCBA board 42 is fixedly arranged in the mounting cavity 413; the cover 43 is fixedly arranged at the opening of the mounting cavity 413 and closes the mounting cavity 413; a first bearing seat 412-1 is provided on the press-fitting part 412; a second bearing seat 311 is provided at the end where the first casing 31 is connected to the volute 1; the inner rotor assembly 33 is connected to the bearing 5 arranged in the first bearing seat 412-1 and the second bearing seat 311 through its rotating shaft 331 and is rotatably arranged in the first casing 31.

[0024] The bearings 5 within the first bearing seat 412-1 and the second bearing seat 311 are graphite bearings. The inner circumferential wall of the through hole through which the rotating shaft 331 passes is provided with three chip removal grooves 51 evenly distributed along the axis of the through hole. The chip removal grooves 51 extend along the axis of the through hole, from one end to the other. These chip removal grooves 51 facilitate the removal of graphite chips generated by friction during the operation of the primary inner rotor assembly 33.

[0025] Three wire passing through holes are provided on the partition plate 411; a sealing rubber pad 6 is installed on the through hole; a puncture hole is provided on the sealing rubber pad 6; three welding pieces 7 are further included; the welding piece 7 includes a body; a plug-in body 71, a first welding body 72 and a second welding body 73 are provided on the body; the plug-in body 71 of the welding piece 7 is inserted on the outer stator assembly 32; three lead-out wires of the stator winding are respectively welded to the first welding body 72 of a welding piece 7 to form an electrical connection; the second welding body 73 passes through the puncture hole and then enters the installation cavity 413, and is inserted into a corresponding welding hole on the PCBA board 42; the second welding body 73 forms an electrical connection with the PCBA board 42 through welding; when the second welding body 73 passes through the puncture hole, the puncture hole tightly wraps the second welding body 73 to form a sealed attachment.

[0026] The first welding body 72 is in a hook shape. When wiring the stator winding, the lead-out wire of the stator winding can be wound around the hook-shaped first welding body 72, and then the lead-out wire is welded to the first welding body.

[0027] A cable assembly 8 is provided on the second housing 41; the cable assembly 8 includes a rubber plug 81 and a cable group 82; an installation groove 411-1 communicating with the inside of the installation cavity 413 is provided on the second housing 41; the rubber plug 81 is plugged in the installation groove 411-1; the cable group 82 passes through the wire passing hole on the rubber plug 81 and then enters the installation cavity 413 and forms an electrical connection with the PCBA board 42; two first pin shaft through holes are provided on the installation groove 411-1; second pin shaft through holes corresponding to the first pin shaft through holes one by one are provided on the rubber plug 81; when the rubber plug 81 is plugged in the installation groove 411-1, the first pin shaft through hole and the second pin shaft through hole are correspondingly matched to form a pin shaft hole; a pin shaft 9 is inserted in the pin shaft hole; the second pin shaft through hole and the pin shaft 9 form a tightly attached and clamped fit. Since the rubber plug 81 has elasticity, when the diameter of the second pin shaft through hole is smaller than the diameter of the pin shaft 9, the second pin shaft through hole can tightly attach and clamp the inserted pin shaft 9.

[0028] In the above specific embodiments, the purpose, technical solutions and beneficial effects of the present invention are further described in detail. It should be understood that the above are only specific embodiments of the present invention and do not limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water pump, comprising a volute, an impeller, a driving motor and a control unit; the volute is provided with a liquid inlet, a liquid outlet and a pump chamber; the impeller is in transmission connection with the output shaft of the driving motor; the impeller is located in the pump chamber and rotates in the pump chamber under the drive of the driving motor; the driving motor includes a first housing, an outer stator assembly and an inner rotor assembly; the outer stator assembly is fixedly arranged in the first housing; the inner rotor assembly includes an inner rotor body fixedly provided with a rotating shaft; the inner rotor body is rotatably arranged in the first housing and forms a cooperation with the outer stator assembly; it is characterized in that: The control unit includes a second housing, a PCBA board, and a cover; the volute is fixedly connected to one end of the first housing and cooperates with one end of the first housing to form a pump chamber; a partition for separating the internal space is provided in the second housing; the part of the second housing on one side of the partition is a press-fitting part, and the part on the other side of the partition is an installation cavity part; an opening is formed at one end of the installation cavity part away from the partition; the PCBA board is fixedly arranged in the installation cavity part; the cover is fixedly arranged at the opening of the installation cavity part and closes the installation cavity part; a first bearing seat is provided on the press-fitting part; a second bearing seat is provided at the end of the first housing connected to the volute; the inner rotor assembly is rotationally arranged in the first housing through its rotating shaft connected and cooperating with bearings arranged in the first bearing seat and the second bearing seat.

2. The water pump according to claim 1, characterized in that: The bearings in the first bearing seat and the second bearing seat are graphite bearings; a plurality of chip removal grooves evenly distributed circumferentially along the axis of the through hole are provided on the circumferential inner wall of the through hole of the graphite bearing for the rotating shaft to pass through; the chip removal grooves extend along the axis direction of the through hole and from one end of the through hole to the other end.

3. A water pump according to claim 1 or 2, characterized in that: Three wire passing through holes are provided on the partition; a sealing rubber pad is installed on the through hole; a puncture hole is provided on the sealing rubber pad; It further includes three solder tabs; the solder tab includes a body; a plug-in body, a first welding body, and a second welding body are provided on the body; the plug-in body of the solder tab is inserted on the outer stator assembly; three lead-out wires of the stator winding are respectively welded to a first welding body of a solder tab to form an electrical connection; the second welding body passes through the puncture hole and enters the installation cavity part, and is inserted into a corresponding welding hole on the PCBA board; the second welding body forms an electrical connection with the PCBA board through welding; When the second welding body passes through the puncture hole, the puncture hole tightly wraps around the second welding body to form a sealed attachment.

4. A water pump according to claim 3, characterized in that: The first welding body is in a hook shape.

5. A water pump according to claim 1 or 2, characterized in that: A cable assembly is provided on the second housing; the cable assembly includes a rubber plug and a cable group; an installation groove communicating with the inside of the installation chamber is provided on the second housing; the rubber plug is plugged in the installation groove; the cable group passes through the wire passing hole on the rubber plug and then enters the installation chamber and forms an electrical connection with the PCBA board; at least one first pin shaft through hole is provided on the installation groove; a second pin shaft through hole is provided on the rubber plug; when the rubber plug is plugged in the installation groove, the first pin shaft through hole and the second pin shaft through hole are correspondingly matched to form a pin shaft hole; a pin shaft is inserted in the pin shaft hole; the second pin shaft through hole and the pin shaft form a tightly attached and clamped fit.

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