Water pump for kitchen cleaning machine

Abstract

The invention relates to the technical field of kitchen cleaning machines, and discloses a water pump for a kitchen cleaning machine, which comprises a pump body, the pump body comprises an upper shell and a lower shell, the upper shell is internally provided with a stator cavity, the stator cavity is internally provided with a motor stator, the lower shell is provided with a boss, and the boss is internally provided with a motor stator. And the boss is internally provided with a rotor inner cavity which is recessed inwards. According to the water pump, a motor stator and a cavity of the motor stator are filled with waterproof resin, the bottom of an inner cavity of a rotor is sealed through a rotor cavity plug, the inner cavity of the rotor is filled with insulating lubricating oil, a sealing piece and an inner concave form a sealing cavity which is connected with a motor output shaft in a rotating and sealing mode, and the sealing cavity is also filled with insulating lubricating oil. The possibility of dry grinding is eradicated while complete sealing is achieved, operation noise is remarkably reduced, and the household cleaning machine is more suitable for being frequently switched between the dry state and the wet state and meeting the food contact safety.

Description

Technical Field

[0001] The invention relates to the technical field of household cleaning machines, in particular to a water pump for a kitchen cleaning machine. Background Art

[0002] A water pump stirs the water to generate water flow, and achieves automatic cleaning through water flow scouring and tumbling. This is a common cleaning technology. However, existing water pumps are difficult to directly apply to household cleaning machines for three main reasons: First, household cleaning machines are limited by space and it is difficult to meet the installation space requirements of existing water pumps; second, household cleaning machines are frequently started and stopped, frequently drained and soaked in water, and complex models cannot be used; third, the operating environment of household cleaning machines is complex, and impurities are prone to jamming the water pump. Therefore, it is necessary to improve the existing water pumps before they can be used in household cleaning machines.

[0003] CN218376931 U discloses a water pump for a cleaning machine, which is a water pump suitable for a household immersion cleaning machine. The water pump comprises a pump body, which comprises an upper shell and a lower shell, wherein an inwardly recessed mounting groove is provided on the upper shell, and the inner wall surface of the upper shell and the outer wall surface of the mounting groove form a closed stator cavity, in which a stator is provided, and a boss matching the mounting groove is provided on the lower shell, and an inwardly recessed rotor cavity is provided in the boss, and a rotor is provided in the rotor cavity, and a fixed shaft is provided at the center of the rotor, and the fixed shaft is rotatably connected with the rotor, and an impeller is provided between the rotor and the bottom surface of the lower shell, and a first water inlet and a water outlet are provided on the lower shell. The top surface or bottom surface of the upper shell is welded and fixed to the remaining part of the upper shell, so that the stator is placed in the stator to form a fully enclosed stator cavity by welding, so that the overall structural strength of the upper shell is high and the protective performance is good, and the impeller is concentrically arranged with the first water inlet, so that the fluid has better contact with the impeller after entering, and the stator is sleeved with the outer wall surface of the mounting groove, and the bottom surface of the upper shell and the top surface of the lower shell are abutted and connected by bolts.

[0004] The stator cavity of the above-mentioned water pump design is fully sealed, and the rotor and fixed shaft and other components are immersed in the medium during operation. This design can meet the requirements of small size and food contact safety, but when the pump body is started, the contact point between the rotor and the fixed shaft is prone to dry grinding during the operation of the pump body. This dry grinding phenomenon not only accelerates the wear of mechanical parts and shortens the service life of the equipment, but also easily causes impurities to affect the operation of the rotor. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a water pump for a kitchen cleaning machine, which greatly reduces the possibility of dry grinding at the contact point between the rotor and the fixed shaft, and reduces the possibility of impurities affecting the rotor.

[0006] In order to achieve the above-mentioned purpose of relatively low noise, the present invention provides the following technical solution: a water pump for a kitchen cleaning machine, comprising a pump body, the pump body comprising an upper shell and a lower shell, a stator seat is arranged in the upper shell, a stator cavity is formed between the stator seat and the interior of the upper shell, a boss is arranged on the stator seat, a motor stator is wound around the outer side of the boss, and the stator cavity is filled with resin; the boss is provided with a rotor cavity formed by an inner concave, a motor rotor is rotatably arranged in the rotor cavity, a rotor cavity plug is sealed at the opening of the rotor cavity, and the rotor cavity is filled with a lubricating agent. Liquid; the motor rotor includes a motor output shaft, a lower support seat is provided on one side of the rotor cavity plug located in the rotor cavity, an upper support seat is provided on the inner wall of the rotor cavity opposite to the lower support seat, and one end of the motor output shaft is rotatably connected to the upper support seat; the rotor cavity plug is concave on the side away from the motor rotor, and a sealing member is provided at the concave portion, the sealing member and the concave portion form a sealed cavity, the sealed cavity is filled with lubricating liquid, the other end of the motor output shaft passes through the lower support seat, the sealing cavity and the sealing member in sequence, and a centrifugal impeller is provided at the end of the other end of the motor output shaft, and a shaft seal is provided between the motor output shaft and the sealing member.

[0007] Preferably, the centrifugal impeller is located between the rotor cavity plug and the lower shell body, the bottom surface of the lower shell body is provided with a water inlet, the upper shell body is provided with a pump cover, and the pump cover is located between the stator seat and the lower shell body; a water inlet cavity is provided between the pump cover and the lower shell body, a pump cavity is formed between the pump cover, the upper shell body and the stator seat, a plurality of water outlets are provided on the upper shell body, and the water outlets are connected with the pump cavity; bearings that cooperate with the motor output shaft are provided on the upper support seat and the lower support seat; after such a water inlet cavity is arranged, the centrifugal impeller can generate local negative pressure after working, and the negative pressure of the water inlet cavity also makes it easier for water to enter the water inlet cavity, thereby ensuring the water inlet efficiency of the water pump; and the arrangement of the bearing can not only increase the wear resistance, but also reduce the friction of the rotation of the motor output shaft, and can also reduce the noise during operation.

[0008] Preferably, one end of the bearing on the lower support seat is located inside the lower support seat, and the other end of the bearing is located outside the lower support seat; a wear-resistant ring is provided on the motor rotor, and the wear-resistant ring is located between the bearing and the motor rotor, and is used to reduce the friction between the motor rotor and the bearing; and one end of the bearing is higher than the lower support seat, and a wear-resistant ring is also provided on the motor rotor. During use, not only can the contact wear between the motor rotor and the bearing be prevented, but also the noise generated by the wear can be reduced, thereby extending the service life.

[0009] Preferably, a water outlet channel is provided on the stator seat, a water spray channel is provided at the bottom of the upper shell body, the pump chamber is connected with the water spray channel through the water outlet channel, one side of the water outlet channel is tangent to the pump chamber, and there are two water outlet channels, the two water outlet channels are symmetrically arranged, there are also two water spray channels, and each water spray channel corresponds to a water outlet channel; after such arrangement, the stator seat and the upper shell body are easy to injection mold, and the preparation cost is low. The tangency can make the water flow relatively smooth, thereby reducing the generation of turbulence and noise, and the arrangement of the two water outlet channels can ensure the water pressure of the water outlet channel, thereby ensuring the impact force of the water flow at the water outlet, and then ensuring the cleaning effect.

[0010] Preferably, the water outlet channel includes a first side wall and a second side wall, the pump chamber includes a pump chamber vertical wall, and the water spray channel includes a third side wall and an annular fourth side wall, the first side wall, the second side wall and the third side wall are all located inside the annular fourth side wall, there are two third side walls, and the two third side walls cooperate with the fourth side wall to form two independent water spray channels, one end of the first side wall is connected to one end of the pump chamber vertical wall, the other end of the first side wall cooperates with one end of the third side wall, one end of the second side wall is connected to the other end of the pump chamber vertical wall, and the other end of the second side wall cooperates with the other end of the third side wall; the first side wall or the second side wall is tangent to the pump chamber vertical wall; after such an arrangement, the side walls are all on the stator seat and the lower shell, and the pump cover is flat against the side walls The surface, so the structure of the pump cover is simple, the mold is easier to open, and it is also easy to injection mold, thereby reducing the production cost of the pump cover; one end of the third side wall is located near the stator seat, and the other end is connected to the fourth side wall, and among the two third side walls, one end of one of the third side walls is near the connection between the other third side wall and the fourth side wall, so that the two water spray channels formed do not need to be additionally provided with a sealing structure, the structure of the side wall is simple, and the lower shell body is also easy to open the mold, thereby reducing the production cost; furthermore, the fourth side wall is an annular structure and is sealed with the pump cover, and the other side walls are all located inside the fourth side wall. Even if there is leakage between the other side walls, the leaked water will not leak from the fourth side wall to the outside of the pump body, thereby ensuring the overall use effect of the pump body.

[0011] Preferably, the other end of the third side wall is provided with a bend, and the proximal end position of the other end of the second side wall is provided with a "Z"-shaped bend that cooperates with the bend for sealing; the other end of the first side wall is provided with a fork, and one end of the third side wall is located in the fork; a radial protrusion is provided between the first side wall and the second side wall on the stator seat, and an end of the water spray channel near the water outlet channel is provided with a step that cooperates with the radial protrusion, and the first side wall and the second side wall both extend to the radial protrusion; the bend can play an enhancing role, and the side wall is not prone to vibration when water flows through, thereby ensuring the smoothness of the water flow and reducing the generation of noise; at the same time, the two bends cooperate with each other and the settings of the fork and the radial protrusion and their respective corresponding structures can form a gap maze seal, without the need to set up other sealing components, and can also play a circumferential limit role, without the need to set up circumferential limit components, thereby reducing assembly and production costs.

[0012] Preferably, the seal is a mechanical seal, which is a mature component and can be purchased directly on the market at a low cost.

[0013] Preferably, a rotating shaft hole is provided at the center position of the centrifugal impeller, and at least two impeller through holes are provided on the centrifugal impeller, and the two impeller through holes are evenly distributed around the rotating shaft hole; the ratio of the aperture of the impeller through hole to the radius of the centrifugal impeller is 1:4-6, and the projection of the impeller through hole on the rotor cavity plug overlaps with the concave part of the rotor cavity plug, and the area of ​​the overlapping part of the impeller through hole projection and the concave part is greater than zero and less than 1 / 3 of the cross-sectional area of ​​the impeller through hole; after the impeller through hole is provided, when the centrifugal impeller is working, the high pressure of the pump cavity causes the water behind the centrifugal impeller to enter the water inlet of the centrifugal impeller through the impeller through hole, thereby reducing The water pressure on the back of the centrifugal impeller reduces the axial force of the entire rotor, thereby reducing friction and noise caused by friction; at the same time, the aperture is controlled at 1:4~6, which can effectively ensure the pump chamber pressure while appropriately reducing the water pressure on the back of the centrifugal impeller, and it is also convenient for tools to pass through the through hole for adjusting and installing the rotor chamber plug and seal; furthermore, the position and aperture size of the through hole can reduce the impact of water pressure on the seal, thereby preventing excessive water pressure from entering the sealing chamber, and preventing negative pressure from being generated and causing the lubricating oil in the sealing chamber to be sucked out, thereby ensuring the stability and reliability of the equipment.

[0014] Preferably, there are two impeller through holes, and the ratio of the aperture of the impeller through hole to the radius of the centrifugal impeller is 1:5, and the area of ​​the overlapping part of the projection of the impeller through hole and the concave part is 1 / 4 of the cross-sectional area of ​​the impeller through hole.

[0015] Preferably, the plurality of water outlets are evenly distributed circumferentially around the center position of the top of the upper shell, and the angles between the axes of adjacent water outlets and the plane of the upper shell where the water outlets are located are different; this allows the sprayed water flow to quickly stir the water, thereby improving the cleaning efficiency.

[0016] Compared with the prior art, the present invention provides a water pump for a kitchen cleaning machine, which has the following beneficial effects:

[0017] 1. The water pump for the kitchen cleaning machine adopts a resin-filled waterproof motor stator and a rotor cavity plug for sealing at the bottom of the rotor inner cavity, and the interior is filled with insulating lubricating oil, which effectively reduces the noise of the pump body during operation. In addition, an inner recess and a sealing member located at the inner recess are provided at one end of the rotor cavity plug away from the motor stator. The sealing member and the inner recess form a sealed cavity, and are rotationally sealed and connected with the motor output shaft. The interior of the sealed cavity is also filled with insulating lubricating oil. These designs significantly reduce friction and vibration, so that the noise of the cleaning pump of the present invention during operation is at least 10 decibels lower than that of the traditional design, thereby improving the comfort of the operating environment and reducing the potential threat to the hearing health of the operator and family members.

[0018] 2. The kitchen cleaning machine water pump has a centrifugal impeller with a shaft hole at the center, and at least two impeller through holes are arranged on the centrifugal impeller, and these impeller through holes are evenly distributed around the shaft hole. This design is not only convenient for the installation of the rotor cavity plug and the seal, but also during the operation, the impeller through holes can balance the pressure on both sides of the centrifugal impeller. This pressure balance helps the centrifugal impeller to maintain a certain suspension state during operation, reduces the friction between the centrifugal impeller and the inner wall of the water inlet of the lower shell, thereby extending the service life of the pump and improving the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional schematic diagram of a water pump for a kitchen cleaning machine according to the present invention from a bottom perspective;

[0020] Figure 2 A three-dimensional schematic diagram of a water pump for a kitchen cleaning machine according to the present invention from a top perspective;

[0021] Figure 3 It is a cross-sectional structural schematic diagram of a water pump for a kitchen cleaning machine of the present invention;

[0022] Figure 4 The kitchen cleaning machine water pump of the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0023] Figure 5 It is a bottom view schematic diagram of a centrifugal impeller of a water pump for a kitchen cleaning machine of the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the water pump for the kitchen cleaning machine of the present invention after removing the lower housing and the pump cover;

[0025] Figure 7 For along Figure 6 Cross-sectional view of the middle BB;

[0026] Figure 8 The present invention is a schematic structural diagram of a stator seat of a water pump for a kitchen cleaning machine.

[0027] In the figure: 1, pump body; 2, upper shell; 3, lower shell; 4, stator cavity; 5, motor stator; 6, boss; 7, rotor cavity; 8, motor rotor; 9, motor output shaft; 10, centrifugal impeller; 11, water inlet; 12, water inlet cavity; 13, pump cavity; 14, water outlet; 15, outlet; 16, upper support seat; 17, lower support seat; 18, wear-resistant ring; 19, rotor cavity plug; 20, sealing cavity; 21, impeller through hole; 22, pump cover; 23, sealing element; 24, stator seat, 25, water outlet channel; 26, water spray channel; 27, first side wall; 28, second side wall; 29, third side wall; 30, fourth side wall; 31, pump cavity vertical wall; 32, fork; 33, radial protrusion; 34, step. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-8 The kitchen washing machine water pump comprises a pump body 1, the pump body 1 comprises an upper shell 2 and a lower shell 3, and a stator seat 24 is arranged in the upper shell 2. Figure 8As shown, the stator seat 24 and the inner cavity of the upper shell 2 form a stator cavity 4, and two sealing O-rings are provided between the stator seat 24 and the upper shell 2. A boss 6 is provided on the stator seat 24, and the boss 6 protrudes toward the stator cavity 4. The silicon steel sheet of the motor stator 5 is sleeved on the outside of the boss 6, and the coil of the motor stator 5 is wound on the silicon steel sheet, and the stator cavity 4 is filled with resin. The resin not only plays a role in fixing and waterproofing, but also plays a role in fixing the various components in the stator cavity 4, thereby improving the stability of the equipment; the end of the boss 6 away from the stator cavity 4 is provided with a rotor cavity 7 formed by an inner concave, and the motor rotor 8 is rotatably provided inside the rotor cavity 7, and a rotor cavity plug 19 is sealed at the opening of the rotor cavity 7, and the rotor cavity 7 is filled with an insulator with heat conduction and lubrication effects. edge liquid; the motor rotor 8 includes a motor output shaft 9, and of course also includes rotor components such as rotor magnetic steel. A lower support seat 17 is provided on one side of the rotor cavity 7 of the rotor cavity 7, and an upper support seat 16 is provided on the inner wall of the rotor cavity 7 opposite to the lower support seat 17. One end of the motor output shaft 9 is rotatably connected to the axial hole of the upper support seat 16 through a bearing; a concave is provided on the side of the rotor cavity plug 19 away from the motor rotor 8, and a sealing member 23 is provided at the opening of the concave. The sealing member 23 and the concave form a sealing chamber 20, and the sealing chamber 20 is filled with lubricating liquid. The other end of the motor output shaft 9 passes through the through hole on the lower support seat 17, the sealing chamber 20 and the through hole on the sealing member 23 in turn, and is connected to the centrifugal impeller 10. There is a shaft seal between the motor output shaft 9 and the sealing member 23. The bottom surface of the lower shell 3 is concave, and a water inlet 11 is provided at the concave part. The side of the lower shell 3 is also provided with the water inlet 11, thereby ensuring the water intake; a pump cover 22 is provided on the upper shell 2, and the pump cover 22 is located between the stator seat 24 and the lower shell 3, and the pump cover 22 is sealed and connected to the upper shell 2; a water inlet chamber 12 is provided between the pump cover 22 and the lower shell 3, and an electrolytic water component is usually provided at the water inlet chamber 12, and a pump chamber 13 is formed between the pump cover 22, the upper shell 2 and the stator seat 24, and the centrifugal impeller 10 is located in the pump chamber 13, and the water inlet of the centrifugal impeller 10 is connected with the water inlet chamber 12, and a plurality of water outlets 14 are provided on the upper shell 2, and the water outlets 14 are connected with the pump chamber 13, and a pressure chamber is formed near the water outlet of the centrifugal impeller 10, and the water outlet 14 is connected with the pressure chamber; there is a bearing in the through hole through which the output shaft 9 of the power supply motor passes on the lower support seat 17.

[0030] Specifically, the resin filling enhances the waterproof performance of the motor, protects the motor from water damage, and prolongs its service life. Secondly, the sealing effect of the rotor cavity plug 19 effectively prevents the intrusion of impurities and moisture, and further protects the internal mechanical parts. In addition, the use of insulating lubricating oil significantly reduces internal friction and wear, reduces noise, improves operating efficiency, and increases the safety of the equipment by reducing heat generation. The combined effect of these designs is to improve the performance of the cleaning pump, reduce maintenance costs, improve the operating environment, and ensure the health and safety of operators. By forming an effective isolation between the rotor cavity 7 and the motor stator 5, the intrusion of water and impurities is prevented, thereby protecting the motor rotor 8 and the motor stator 5 from damage. At the same time, the setting of the seal 23 reduces the direct contact between the rotor and the stator, reduces the noise and wear caused by friction, and prolongs the service life of the equipment. In addition, the insulating lubricating oil filled in the sealing cavity 20 not only further enhances the sealing effect, but also helps to reduce the friction between the rotating parts and improve the operating efficiency and stability of the pump. The rotating sealed connection between the seal 23 and the motor output shaft 9, together with the insulating lubricating oil filled in the sealing chamber 20, constitutes an efficient sealing system. The main advantage of this design is that it significantly improves the sealing performance of the equipment, effectively isolates water and impurities, and protects the internal structure of the motor from damage. At the same time, the rotating seal reduces the direct contact between the motor output shaft 9 and other components, reduces friction and wear, and extends the service life of the equipment. Insulating lubricating oil is a special lubricating oil, which not only lubricates the inside of the motor stator 5 to prevent friction and wear between mechanical parts, but more importantly, it has excellent insulation properties, can effectively isolate current, prevent current leakage and equipment short circuit, thereby protecting the motor from water damage and extending its service life. In the present invention, insulating lubricating oil is filled in the sealed cavity 20 formed by the inside of the motor stator 5 and the rotor cavity plug 19, forming a closed insulating environment, ensuring the safety and reliability of the motor when it runs for a long time in the immersion cleaning machine. In addition, the insulating lubricating oil can also reduce internal friction and wear, reduce noise, improve operating efficiency, and increase the safety of the equipment by reducing heat generation. The combined effect of these designs is to improve the performance of the cleaning pump, reduce maintenance costs, improve the operating environment, and ensure the health and safety of the operator.

[0031] Further, such as Figure 6-8As shown, a water outlet channel 25 is provided at one end of the motor stator 5 on the stator seat 24, and the water outlet channel 25 is surrounded by the end face of the stator seat 24, the first side wall 27, the second side wall 28 and the inner wall of the pump cover 22; a water spray channel 26 is provided at the bottom of the upper shell 2, and the water spray channel 26 is surrounded by the upper shell 2, the third side wall 29, the annular fourth side wall 30 and the inner wall of the pump cover 22, one end of the water outlet channel 25 is connected with the pump chamber 13, and the other end of the water outlet channel 25 is connected with the water spray channel 26, and one side of the water outlet channel 25 is tangent to the pump chamber 13, there are two water outlet channels 25, the two water outlet channels 25 are symmetrically arranged, there are also two water spray channels 26, and each water spray channel 26 corresponds to a water outlet channel 25. The pump chamber 13 includes a pump chamber vertical wall 31, which has two openings corresponding to the two water outlet channels 25; the first side wall 27, the second side wall 28 and the third side wall 29 are all located in the annular fourth side wall 30, and there are two third side walls 29. The two third side walls 29 cooperate with the fourth side wall 30 to form two independent water spray channels 26, specifically, one end of the first side wall 27 is connected to one end of the pump chamber vertical wall 31, and the other end of the first side wall 27 cooperates with one end of the third side wall 29, one end of the second side wall 28 is connected to the other end of the pump chamber vertical wall 31, and the other end of the second side wall 28 cooperates with the other end of the third side wall 29; the first side wall 27 or the second side wall 28 is tangent to the pump chamber vertical wall 31. The other end of the third side wall 29 is provided with a bend, and the proximal end position of the other end of the second side wall 28 is provided with a "Z"-shaped bend that cooperates with the bend for sealing; the other end of the first side wall 27 is provided with a fork 32, and one end of the third side wall 29 is located in the fork 32; a radial protrusion 33 is provided at a position between the first side wall 27 and the second side wall 28 on the stator seat 24, and one end of the water spray channel 26 near the water outlet channel 25 is provided with a step 34 that cooperates with the radial protrusion 33, and the first side wall 27 and the second side wall 28 both extend to the radial protrusion 33.

[0032] Further, such as Figure 5 As shown, a shaft hole is provided at the center of the centrifugal impeller 10, and the cross-section of the shaft hole is D-shaped. Of course, the end of the motor output shaft 9 is also a D-shaped structure that matches the shaft hole. At least two impeller through holes 21 are provided on the centrifugal impeller 10, and at least two impeller through holes 21 are evenly distributed around the shaft hole; the ratio of the aperture of the impeller through hole 21 to the radius of the centrifugal impeller 10 is 1:4-6 (1:5 in this example, and can also be 1:4, 1:4.5 or 1:6, etc.), and the projection of the impeller through hole 21 on the rotor cavity plug 19 overlaps with the concave part of the rotor cavity plug 19, and the area of ​​the overlapping part of the projection of the impeller through hole 21 and the concave part is greater than zero and less than or equal to 1 / 3 of the cross-sectional area of ​​the impeller through hole 21 (1 / 4 in this example, and can also be 1 / 3, 1 / 5 or 1 / 6, etc.).

[0033] Specifically, Figure 5 , Figure 6 and Figure 7 As shown, the two through holes arranged on the centrifugal impeller 10 are evenly distributed around the rotating shaft hole, and cleverly realize multiple functions. First, they effectively balance the pressure on both sides of the centrifugal impeller 10, prevent vibration or deformation caused by pressure difference, thereby improving the stability and operation efficiency of the pump. Secondly, the existence of the through holes reduces the direct contact between the centrifugal impeller 10 and other parts of the pump body 1 (such as the inner wall of the water inlet 11), reduces friction and wear, and extends the service life of the centrifugal impeller 10. Finally, the through holes optimize the water flow distribution inside the centrifugal impeller 10, improve the cleaning efficiency, make the water flow more uniform and powerful, thereby improving the cleaning effect, and also facilitate the installation of the rotor cavity plug 19 and the seal 23, simplifying the maintenance process.

[0034] Furthermore, there are a plurality of water outlets 14 , which are evenly distributed circumferentially around the center of the top of the upper shell 2 , and the angles between the axes of adjacent water outlets 14 and the plane of the upper shell 2 where the water outlets 14 are located are different.

[0035] Specifically, two bearings are configured on the outside of the motor output shaft 9, which are respectively installed in the upper support seat 16 and the lower support seat 17. This layout enhances the stability and carrying capacity of the pump, while reducing the direct friction of the motor output shaft 9 and extending its service life. The raised part of the top of the bearing in the lower support seat 17 is matched with the wear-resistant ring 18, which not only improves the durability of the pump, but also helps to protect the lower support seat from wear and reduce maintenance costs. In addition, the circumferentially uniform design of the water outlet 14 optimizes the distribution of water flow, improves the cleaning efficiency and the service life of the pump. Overall, the combined effect of these designs is to improve the performance of the pump, ensure its stable operation under high load, reduce energy consumption and maintenance costs, and achieve efficient and lasting cleaning effects.

[0036] In summary, the water pump for the kitchen cleaning machine adopts a resin-filled waterproof motor stator 5 and a rotor cavity plug 19 for sealing at the bottom of the rotor inner cavity 7, and the interior is filled with insulating lubricating oil, which effectively reduces the noise of the pump body 1 during operation. In addition, the rotor cavity plug 19 is provided with a recess and a seal 23 located at the recess at the end away from the motor stator 5. The seal 23 and the recess form a sealed cavity 20, and are rotatably sealed and connected to the motor output shaft 9. The sealed cavity 20 is also filled with insulating lubricating oil. These designs significantly reduce friction and vibration, so that the noise of the cleaning pump of the present invention during operation is at least 10 decibels lower than that of the traditional design, thereby improving the comfort of the operating environment and reducing the potential threat to the hearing health of the operator.

[0037] In addition, the centrifugal impeller 10 is provided with a shaft hole at the center position, and at least two impeller through holes 21 are provided on the centrifugal impeller 10, and these impeller through holes 21 are evenly distributed around the shaft hole. This design not only facilitates the installation of the rotor cavity plug 19 and the seal 23, but also during operation, the impeller through hole 21 can balance the pressure on both sides of the centrifugal impeller 10. This pressure balance helps the centrifugal impeller 10 to maintain a certain suspension state during operation, reduces the friction between the centrifugal impeller 10 and the inner wall of the water inlet 11 of the lower shell 3, thereby extending the service life of the pump and improving the cleaning efficiency, and solves the problem that the contact point between the rotor and the fixed shaft is prone to dry grinding during the operation of the pump body 1. This dry grinding phenomenon not only accelerates the wear of mechanical parts and shortens the service life of the equipment, but also because the energy generated by friction is converted into sound energy, resulting in a significant increase in noise. This noise problem not only affects the comfort of the operating environment, but may also pose a potential threat to the hearing health of the operator, especially in long-term or high-frequency usage scenarios.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water pump for a kitchen cleaning machine, comprising a pump body (1), characterized in that: The pump body (1) comprises an upper shell (2) and a lower shell (3); a stator seat (24) is provided in the upper shell (2); a stator cavity (4) is formed between the stator seat (24) and the upper shell (2); a boss (6) is provided on the stator seat (24); a motor stator (5) is wound around the outer side of the boss (6); and the stator cavity (4) is filled with resin; the boss (6) is provided with a rotor cavity (7) formed in an inwardly concave manner; a motor rotor (8) is rotatably provided in the rotor cavity (7); a rotor cavity plug (19) is provided at the opening of the rotor cavity (7) in a sealed manner; and a liquid having a lubricating effect is filled in the rotor cavity (7); the motor rotor (8) comprises a motor output shaft (9); the rotor cavity plug ( 19) A lower support seat (17) is provided on one side located in the rotor inner cavity (7), an upper support seat (16) is provided on the inner wall of the rotor inner cavity (7) opposite to the lower support seat (17), and one end of the motor output shaft (9) is rotatably connected to the upper support seat (16); the rotor cavity plug (19) is concave on the side away from the motor rotor (8), and a sealing member (23) is provided at the concave portion, the sealing member (23) and the concave portion form a sealing cavity (20), the sealing cavity (20) is filled with a lubricating liquid, the other end of the motor output shaft (9) passes through the lower support seat (17), the sealing cavity (20) and the sealing member (23) in sequence, and a centrifugal impeller (10) is provided at the end of the other end of the motor output shaft (9), and a shaft seal is formed between the motor output shaft (9) and the sealing member (23).

2. The water pump for a kitchen cleaning machine according to claim 1, characterized in that: The centrifugal impeller (10) is located between the rotor cavity plug (19) and the lower shell (3); the bottom surface of the lower shell (3) is provided with a water inlet (11); the upper shell (2) is provided with a pump cover (22); the pump cover (22) is located between the stator seat (24) and the lower shell (3); a water inlet cavity (12) is provided between the pump cover (22) and the lower shell (3); a pump cavity (13) is formed between the pump cover (22), the upper shell (2) and the stator seat (24); a plurality of water outlets (14) are provided on the upper shell (2); the water outlets (14) are communicated with the pump cavity (13); and bearings that cooperate with the motor output shaft (9) are provided on both the upper support seat (16) and the lower support seat (17).

3. The water pump for a kitchen cleaning machine according to claim 2, characterized in that: One end of the bearing located on the lower support seat (17) is located inside the lower support seat (17), and the other end of the bearing is located outside the lower support seat (17); a wear-resistant ring (18) is provided on the motor rotor (8), and the wear-resistant ring (18) is located between the bearing and the motor rotor (8) to reduce friction between the motor rotor (8) and the bearing.

4. The water pump for a kitchen cleaning machine according to claim 2, characterized in that: The stator seat (24) is provided with a water outlet channel (25), the bottom of the upper shell (2) is provided with a water spray channel (26), the pump chamber (13) is connected with the water spray channel (26) through the water outlet channel (25), one side of the water outlet channel (25) is tangent to the pump chamber (13), and there are two water outlet channels (25), the two water outlet channels (25) are symmetrically arranged, there are also two water spray channels (26), and each water spray channel (26) corresponds to one water outlet channel (25).

5. The water pump for a kitchen cleaning machine according to claim 4, characterized in that: The water outlet channel (25) comprises a first side wall (27) and a second side wall (28); the pump chamber (13) comprises a pump chamber vertical wall (31); the water spray channel (26) comprises a third side wall (29) and an annular fourth side wall (30); the first side wall (27), the second side wall (28) and the third side wall (29) are all located inside the annular fourth side wall (30); there are two third side walls (29), and the two third side walls (29) are connected to the fourth side wall (30). Two independent water spray channels (26) are formed by cooperation, one end of the first side wall (27) is connected to one end of the pump chamber vertical wall (31), the other end of the first side wall (27) cooperates with one end of the third side wall (29), one end of the second side wall (28) is connected to the other end of the pump chamber vertical wall (31), and the other end of the second side wall (28) cooperates with the other end of the third side wall (29); the first side wall (27) or the second side wall (28) is tangent to the pump chamber vertical wall (31).

6. The water pump for a kitchen cleaning machine according to claim 5, characterized in that: The other end of the third side wall (29) is provided with a bend, and the proximal end of the other end of the second side wall (28) is provided with a "Z"-shaped bend that cooperates with the bend for sealing; the other end of the first side wall (27) is provided with a fork (32), and one end of the third side wall (29) is located in the fork (32); a radial protrusion (33) is provided between the first side wall (27) and the second side wall (28) on the stator seat (24), and one end of the water spray channel (26) near the water outlet channel (25) is provided with a step (34) that cooperates with the radial protrusion (33), and the first side wall (27) and the second side wall (28) both extend to the radial protrusion (33).

7. The water pump for a kitchen cleaning machine according to claim 1, characterized in that: The sealing element (23) is a mechanical sealing element.

8. The water pump for a kitchen cleaning machine according to claim 1, characterized in that: A rotating shaft hole is provided at the center of the centrifugal impeller (10), and at least two impeller through holes (21) are provided on the centrifugal impeller (10), and at least two impeller through holes (21) are evenly distributed around the rotating shaft hole in the circumferential direction; the ratio of the diameter of the impeller through hole (21) to the radius of the centrifugal impeller (10) is 1:4-6, and the projection of the impeller through hole (21) on the rotor cavity plug (19) overlaps with the concave part of the rotor cavity plug (19), and the area of ​​the overlapping part between the projection of the impeller through hole (21) and the concave part is greater than zero and less than or equal to 1 / 3 of the cross-sectional area of ​​the impeller through hole (21).

9. The water pump for a kitchen cleaning machine according to claim 8, characterized in that: There are two impeller through holes (21), and the ratio of the diameter of the impeller through hole (21) to the radius of the centrifugal impeller (10) is 1:

5. The area of ​​the overlapping part between the projection of the impeller through hole (21) and the inner concave portion is 1 / 4 of the cross-sectional area of ​​the impeller through hole (21).

10. The water pump for a kitchen cleaning machine according to claim 2, characterized in that: The plurality of water outlets (14) are evenly distributed circumferentially around the center position of the top of the upper shell (2), and the angles between the axes of adjacent water outlets (14) and the plane of the upper shell (2) where the water outlets (14) are located are different.

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