A water pump for a cleaning machine

Abstract

The present invention discloses a water pump for a cleaning machine, including a centrifugal impeller and a motor, wherein the motor includes a motor shaft, and the motor shaft passes through the centrifugal impeller upward so that the motor can drive the centrifugal impeller to rotate, and is characterized in that: the water pump also includes a heating plate, the motor is supported above the heating plate at intervals, a water flow channel is formed in the motor for water to flow from bottom to top into the centrifugal impeller, and the interval between the motor and the heating plate constitutes a water inlet of the water pump, and the water inlet is connected to the water flow channel. By designing the centrifugal impeller, the motor, the guide seat, and the heating plate as an integrated whole, they can be fixed to the bottom of the tank body with screws during installation; eliminating the separate setting of the guide seat, not only is installation convenient, but also the problem of impeller friction noise caused by improper installation and inadequate size of the guide seat in the past is solved.

Description

Technical Field

[0001] The invention relates to kitchen equipment, in particular to a water pump for a cleaning machine. Background Art

[0002] A dishwasher is a device that sprays cold or hot water onto dishes to remove dirt adhering to the dishes and clean the dishes. The dishes are placed in a dish rack in a dishwasher. A general dishwasher includes a pump and a nozzle for spraying washing water, a heater for generating hot water, etc. These dishwashers all have a common disadvantage, that is, they require a large space and are not suitable for use in some families with a large population and a small per capita living area. Therefore, in many families, the use of dishwashers is not very common.

[0003] In order to save space, many designs of sink-type washing machines have appeared, that is, the existing sink is converted into a washing machine, and the sink is directly used as the washing space. Generally, a rotating spray arm is set at the bottom of the sink, and the rotating spray arm is usually connected to a pump body driven by a motor. For example, the Chinese patent application number 201310749724.1 of the applicant discloses a box structure of a sink-type washing machine, including a box forming a washing space, the box including a sink body, a local concave area at the bottom of the sink body, a heating component is arranged in the local concave area, a water pump is also arranged in the local concave area, a motor is arranged below the bottom, and the output shaft of the motor extends upward into the sink body to drive the water pump; another example is a sink-type dishwasher heating device disclosed in the Chinese patent application number 201620705427.6, the main body is a heating plate, the heating plate is arranged at the bottom of the box, the central axis of the bottom tank of the box is provided with a motor hole, and the bottom tanks on both sides of the motor hole are respectively provided with water outlet holes and heating areas.

[0004] In the above-mentioned cleaning machines, the motor is installed outside the tank, there is a guide seat on the motor, and the motor and the heating plate are installed separately. There are the following disadvantages: 1. Separate installation takes up space; 2. The inappropriate size of the guide seat and other factors can easily cause the impeller of the water pump to rub and make abnormal noise; 3. When the motor power is large, the motor heats up a lot, which not only makes the motor easy to be damaged, but also wastes the heat generated by the motor. Therefore, there is still room for further improvement. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a water pump for a cleaning machine which reduces noise, prolongs service life and saves energy in view of the problems existing in the above-mentioned prior art.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a water pump for a cleaning machine, including a centrifugal impeller and a motor, the motor including a motor shaft, the motor shaft passing upward through the centrifugal impeller so that the motor can drive the centrifugal impeller to rotate, characterized in that: the water pump also includes a heating disk, the motor is supported above the heating disk with an interval, a water flow channel is formed in the motor for water to flow from bottom to top into the centrifugal impeller, the interval between the motor and the heating disk constitutes a water inlet of the water pump, and the water inlet is connected to the water flow channel.

[0007] To facilitate the upward pumping of water, the motor includes a motor housing, which is in the shape of a hollow cylinder. A cylindrical partition is arranged in the motor housing, and the partition divides the interior of the motor housing into a concentric first chamber located radially inside and a second chamber located outside the first chamber. A magnetic ring impeller is arranged in the first chamber, and the magnetic ring impeller includes a magnetic ring as a rotor. An axial flow impeller is arranged in the magnetic ring, and the motor shaft passes through the axial flow impeller. The axial flow impeller, the magnetic ring and the motor shaft are connected and fixed, and a coil as a stator is arranged in the second chamber.

[0008] Preferably, a motor upper support plate is provided on the top of the motor housing, a motor lower support plate is provided on the bottom of the motor housing, a first through hole is opened in the middle of the motor upper support plate, a second through hole is opened in the middle of the top surface of the motor housing, and a third through hole is opened in the middle of the motor lower support plate, and the first through hole, the second through hole and the third through hole correspond to the first chamber.

[0009] Preferably, a motor upper cover is provided above the upper support plate of the motor, a accommodating cavity is provided in the middle of the motor upper cover, and part of the centrifugal impeller is provided in the accommodating cavity, and a water flow channel is formed in the motor by providing the accommodating cavity of the motor upper cover, the first through hole of the upper support plate of the motor, the second through hole and the first chamber of the motor housing, and the second through hole of the lower support plate of the motor.

[0010] To prevent the motor shaft from shaking, a first axial hole is provided in the middle of the first through hole, a second axial hole is provided in the middle of the third through hole, the bottom of the second axial hole is closed, and the motor shaft extends upward from the second axial hole of the motor lower support plate through the first axial hole into the centrifugal impeller.

[0011] In order to extend the service life of the motor, the first shaft hole and the second shaft hole are both hollow cylindrical and surrounded by wear-resistant material.

[0012] In order to prevent water leakage from the motor, an annular groove is formed on the bottom surface of the upper support plate of the motor, and an O-ring is arranged in the groove.

[0013] In order to form a gradually contracting flow channel and accelerate the water flow upward, the bottom surface of the upper support plate of the motor is a guide surface that gradually tilts upward from the periphery to the middle.

[0014] To facilitate the spacing of motors, the heating plate is disposed below the motor and includes a plate body and a support column. The support column is disposed on the periphery of the top surface of the plate body and is fixed to the motor at the top. Positioning steps are formed on the peripheral wall of the support column, and the motor is supported on the positioning steps.

[0015] To facilitate the connection and fixation between the heating plate and the motor, a motor mounting hole is opened on the motor, and the support column extends upward into the motor mounting hole. An external thread is formed on the top of the support column, and a clip with an internal thread is arranged above the motor mounting hole, and the clip is tightened to the top of the support column.

[0016] Preferably, to facilitate the lead-out of the motor wires, a coil wire hole is opened on the peripheral wall of the support column, located above the positioning step, and the motor wires of the motor pass through the coil wire hole into the support column and out from the bottom of the support column to the bottom of the disk.

[0017] Preferably, to facilitate the routing of motor wires and heating tube wires, the heating plate also includes a base plate located at the bottom of the plate body, a heating tube and heating tube wires connected to the heating tube are arranged in the plate body, and routing holes are opened on the base plate, and the motor wires and heating tube wires pass through the routing holes to the bottom of the base plate.

[0018] Compared with the prior art, the advantages of the present invention are: 1) by integrating the centrifugal impeller, motor, guide seat and heating plate into an integrated design, they can be fixed to the bottom of the trough body with screws during installation; 2) the separate setting of the guide seat is omitted, which is not only convenient for installation, but also solves the problem of impeller friction noise caused by improper installation and inadequate size of the guide seat in the past; 3) the motor directly pumps water above the heating plate, which more effectively accelerates the water flow speed on the surface of the heating plate. Therefore, the faster the water flow takes away the heat of the heating plate, the faster the heat is prevented from accumulating locally on the heating plate, making the temperature distribution more uniform; 4) during the operation of the motor, the water flow continuously flushes the motor casing, which can cool the coil. Especially for motors with higher power, the water flow can not only dissipate the heat of the motor, but also utilize this part of the heat, thereby improving the energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a water pump according to an embodiment of the present invention applied to a cleaning machine;

[0020] Figure 2 A schematic diagram of the structure of a water pump according to an embodiment of the present invention;

[0021] Figure 3 is a cross-sectional view of a water pump according to an embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of the exploded structure of a water pump according to an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of an upper support plate of a motor of a water pump according to an embodiment of the present invention;

[0024] Figure 6 A schematic diagram of a motor housing and a coil of a water pump according to an embodiment of the present invention;

[0025] Figure 7 It is a schematic diagram of the exploded structure of the magnetic ring impeller of the water pump according to an embodiment of the present invention;

[0026] Figure 8 It is a schematic diagram of the exploded structure of the heating plate of the water pump according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings.

[0028] See also Figure 1 A cleaning machine includes a water tank body 200 and a water pump 100. The bottom of the water tank body 200 is concave to form a drain area, the drain area is covered with a drain plate, and the water pump 100 is arranged in the drain area. The above structure is the same as the prior art.

[0029] See also Figure 2 to Figure 4 The water pump 100 includes a centrifugal impeller 1, a motor cover 2, a support plate 3 on the motor shaft, an O-ring 4, a support plate 5 under the motor shaft, a motor housing 6, a magnetic ring impeller 7, a coil 8, a motor shaft 9 and a heating plate 10. The above-mentioned motor cover 2, the support plate 3 on the motor shaft, the O-ring 4, the support plate 5 under the motor shaft, the motor housing 6, the magnetic ring impeller 7, the coil 8, and the motor shaft 9 constitute a motor.

[0030] A receiving cavity 21 is provided in the middle of the motor upper cover 2, and part of the centrifugal impeller 1 can be provided in the receiving cavity 21. The centrifugal impeller 1 located above the motor upper cover 2 is used to be provided in the rotating spray arm of the cleaning machine. A screw button 22 is provided on the top surface of the motor upper cover 2, around the receiving cavity 21, for connecting with the rotating spray arm of the cleaning machine.

[0031] The motor upper support plate 3 is located below the motor upper cover 2. The motor upper support plate 3 is provided with an upper cover mounting hole 31, which is used to allow screws to pass through the upper cover mounting hole 31 and connect and fix with the motor upper cover 2. A first through hole 32 is provided in the middle of the motor upper support plate 3 to allow water to pass through. The first through hole 32 corresponds to the accommodating cavity 21 and is in fluid communication. A first axial hole 33 is provided in the middle of the first through hole 32. The first axial hole 33 is a hollow cylindrical shape surrounded by wear-resistant material. Figure 5The bottom surface of the upper support plate 3 of the motor is formed with an annular groove 34, so that an O-ring 4 can be set in the groove 34 to prevent the water pump from leaking when pumping water. The bottom surface of the upper support plate 3 of the motor is a guide surface 35 that gradually tilts upward from the periphery to the middle, thereby forming a gradually contracting flow channel, which can guide the water flow to the first through hole 32 and pump it upward through the centrifugal impeller 1.

[0032] Combination Figure 3 and Figure 5 The motor mounting hole 36 is arranged on the periphery of the upper support plate 3 of the motor so that it can be installed with the motor housing 6. The motor housing 6 is in the shape of a hollow cylinder, and a second through hole 61 is provided in the middle of the top surface thereof for water to flow through, and the bottom surface of the motor housing 6 is open. A cylindrical partition 62 is arranged inside the motor housing 6, and the height of the partition 62 is the same as that of the motor housing 6, so as to divide the inside of the motor housing 6 into a concentric first chamber 63 located radially inside and a second chamber 64 located on the periphery of the first chamber 63, the above-mentioned magnetic ring impeller 7 is placed in the first chamber 63, and the coil 8 is arranged in the second chamber 64.

[0033] The lower support plate 5 of the motor is enclosed at the bottom of the motor housing 6. Similarly, a third through hole 51 is opened in the middle of the lower support plate 5 of the motor to allow water to flow through. The positions of the first through hole 32, the second through hole 61 and the third through hole 51 correspond to the first chamber 63. A second axial hole 52 is formed in the middle of the third through hole 51 to support the motor shaft 9. The second axial hole 52 is a hollow cylinder surrounded by wear-resistant material. The bottom of the second axial hole 52 is closed, and the motor shaft 9 extends upward from the lower support plate 5 of the motor into the centrifugal impeller 1. Preferably, the materials of the upper support plate 3 of the motor and the lower support plate 5 of the motor are both stainless steel to prevent the motor shaft 9 from shaking during rotation. After the coil 8 is installed, the lower support plate 5 of the motor is sealed with the motor housing 6 by sealant to prevent water from entering the coil 8 during use.

[0034] See also Figure 7The magnetic ring impeller 7 includes an axial flow impeller 71 and a magnetic ring 72 arranged on the periphery of the axial flow impeller 71. The axial flow impeller 71 includes a spiral blade 711, which pumps water from the bottom to the top. The motor shaft 9 passes through the middle of the axial flow impeller 71. The periphery of the magnetic ring 72 is close to the partition 62. The axial flow impeller 71, the magnetic ring 72 and the motor shaft 9 are connected and fixed so that when the motor is running, the axial flow impeller 71 is driven to rotate by the magnetic ring 72, and the axial flow impeller 71 can drive the motor shaft 9 to rotate. Since the operation of the motor requires the coil 8 (stator) and the magnetic ring 72 (rotor), and the magnetic ring 72 surrounds the axial flow impeller 71, it is equivalent to combining the axial flow impeller 71 and the magnetic ring 72 into a whole, forming a part of the motor. Under the action of the axial flow impeller 71, the water flows through the middle of the magnetic ring 72, that is, flows through the middle of the motor. Since the water level is not high enough to submerge the centrifugal impeller 1, the axial flow impeller 71 mainly pumps water up for pressurizing the centrifugal impeller 1. The manufacturing material of the axial flow impeller 71 requires that the thermal expansion coefficient of the axial flow impeller is close to that of the magnetic ring to prevent the axial flow impeller 71 from damaging the magnetic ring 72 when it expands due to heat.

[0035] Thus, through the accommodating cavity 21 of the motor upper cover 2, the first through hole 32 of the motor upper support plate 3, the second through hole 61 and the first chamber 63 of the motor housing 6, and the second through hole 51 of the motor lower support plate 5, a water flow channel is formed in the motor, so that water can flow through the motor from bottom to top and enter the centrifugal impeller.

[0036] The heating plate 10 is arranged below the motor, and includes a plate body 101 and a support column 102. The support column 102 is arranged on the periphery of the top surface of the plate body 101 and extends upward into the motor mounting hole 36 of the upper support plate 3 of the motor. A radially concave groove 65 is formed on the peripheral wall of the motor housing 6 so that the support column 102 extends upward from the groove 65 to reduce the overall volume of the water pump. An external thread 1021 is formed on the top of the support column 102, and a buckle 1022 with an internal thread is arranged above the motor mounting hole 36 and is tightened with the top of the support column 102. A positioning step 1023 is formed on the peripheral wall of the support column 102, and the lower support plate 5 of the motor is supported on the positioning step 1023. Through the above-mentioned buckle 1022 and positioning step 1023, the support column 102 can be connected and fixed to the motor, and a certain interval is provided between the motor and the plate body 101 of the heating plate 10 to form a water inlet of the water pump, which is connected to the water flow channel of the motor so that water flows into the motor from the drain area.

[0037] A coil wire hole 1024 is provided on the peripheral wall of the support column 102 above the positioning step 1023. The motor wire 81 connected to the motor coil 8 passes through the coil wire hole 1024 into the support column 102, and then passes through the bottom of the support column 102 to the bottom of the disk body 101. The coil wire hole 1024 is sealed by a temperature-resistant glue.

[0038] See also Figure 8 The heating plate 10 further includes a bottom plate 103 located at the bottom of the plate body 101, and a heating tube 1011 and a heating tube wire 1012 connected to the heating tube 1011 are arranged in the plate body 101. A wiring hole 1031 is provided on the bottom plate 103, so that the motor wire 81 and the heating tube wire 1012 pass through the wiring hole 1031 to the bottom of the bottom plate 103 and connect to the power supply.

[0039] When the water pump is running, the water in the drainage area continuously enters between the motor and the heating plate 10 at the bottom of the water pump, the water is heated by the heating plate 10, and then quickly sucked by the spiral blades 711 in the magnetic ring impeller 7, passes through the magnetic ring impeller 7, enters the centrifugal impeller 1, and finally enters the rotating spray arm. In this process, the water flow will continuously take away the heat generated by the heating plate 10 and the heat generated by the coil, ensuring that the temperature of the motor coil 8 does not rise, and also improving the energy utilization rate.

[0040] During normal use, the integrated water pump is submerged in the drainage area, and the motor and centrifugal impeller 1 are located directly above the heating plate 10, which can more effectively remove the heat around the heating plate 10, making the heat around the heating plate 10 more uniform. This is because compared with the previous structure in which the heating plate 10 is arranged next to it, this is because the motor directly pumps water directly above the heating plate 10, which more effectively accelerates the water flow speed on the surface of the heating plate 10. Therefore, the faster the water flow removes the heat of the heating plate 10, the heat is prevented from accumulating locally on the heating plate 10, making the temperature distribution more uniform. This is especially important for cleaning machines using plastic cylinders. This design can accelerate the heat extraction of the heating plate 10 and effectively prevent the local heat of the heating plate 10 from being too high, causing the plastic to melt.

[0041] In addition, during the operation of the motor, the water flow continuously flushes the motor housing 6, which can cool the coil 8. Especially for motors with higher power, the water flow can not only dissipate the heat of the motor, but also utilize this part of the heat, thereby improving the energy utilization rate.

Claims

1. A water pump for a cleaning machine, comprising a centrifugal impeller (1) and a motor, wherein the motor comprises a motor shaft (9), wherein the motor shaft (9) passes upward through the centrifugal impeller (1) so that the motor can drive the centrifugal impeller (1) to rotate, characterized in that: The water pump further comprises a heating plate (10), the motor is supported above the heating plate (10) at an interval, a water flow channel is formed in the motor for water to flow from bottom to top into the centrifugal impeller (1), the interval between the motor and the heating plate (10) constitutes a water inlet of the water pump, and the water inlet is in communication with the water flow channel; The motor comprises a motor housing (6), the motor housing (6) is in the shape of a hollow cylinder, a cylindrical partition (62) is arranged inside the motor housing (6), and the partition (62) divides the interior of the motor housing (6) into a first chamber (63) located radially inside and a second chamber (64) located on the periphery of the first chamber (63) which are concentric; An upper motor support plate (3) is arranged on the top of the motor housing (6), a lower motor support plate (5) is arranged on the bottom of the motor housing (6), a first through hole (32) is opened in the middle of the upper motor support plate (3), a second through hole (61) is opened in the middle of the top surface of the motor housing (6), and a third through hole (51) is opened in the middle of the lower motor support plate (5), and the first through hole (32), the second through hole (61) and the third through hole (51) correspond to the first chamber (63); A motor upper cover (2) is arranged above the motor upper support plate (3), a receiving chamber (21) is arranged in the middle of the motor upper cover (2), and a part of the centrifugal impeller (1) is arranged in the receiving chamber (21), and a water flow channel is formed in the motor by arranging the receiving chamber (21) of the motor upper cover (2), the first through hole (32) of the motor upper support plate (3), the second through hole (61) and the first chamber (63) of the motor housing (6), and the third through hole (51) of the motor lower support plate (5); An annular groove (34) is formed on the bottom surface of the upper support plate (3) of the motor, and an O-type sealing ring (4) is arranged in the groove (34).

2. The water pump for a cleaning machine according to claim 1, characterized in that: A magnetic ring impeller (7) is arranged in the first chamber (63), the magnetic ring impeller (7) includes a magnetic ring (72) as a rotor, an axial flow impeller (71) is arranged in the magnetic ring (72), the motor shaft (9) passes through the axial flow impeller (71), the axial flow impeller (71), the magnetic ring (72) and the motor shaft (9) are connected and fixed, and a coil (8) as a stator is arranged in the second chamber (64).

3. The water pump for a cleaning machine according to claim 1, characterized in that: A first axial hole (33) is arranged in the middle of the first through hole (32), a second axial hole (52) is arranged in the middle of the third through hole (51), the bottom of the second axial hole (52) is closed, and the motor shaft (9) extends upward from the second axial hole (52) of the motor lower support plate (5) through the first axial hole (33) and into the centrifugal impeller (1).

4. The water pump for a cleaning machine according to claim 3, characterized in that: The first axial hole (33) and the second axial hole (52) are both hollow cylindrical and surrounded by wear-resistant material.

5. The water pump for a cleaning machine according to claim 1, characterized in that: The bottom surface of the upper support plate (3) of the motor as a whole is a flow guide surface (35) which gradually slopes upward from the periphery to the middle.

6. The water pump for a cleaning machine according to any one of claims 1 to 5, characterized in that: The heating plate (10) is arranged below the motor and comprises a plate body (101) and a support column (102); the support column (102) is arranged on the periphery of the top surface of the plate body (101) and is fixed to the motor at the top; a positioning step (1023) is formed on the peripheral wall of the support column (102), and the motor is supported on the positioning step (1023).

7. The water pump for a cleaning machine according to claim 6, characterized in that: The motor is provided with a motor mounting hole (36), the support column (102) extends upward into the motor mounting hole (36), an external thread (1021) is formed on the top of the support column (102), a buckle (1022) with an internal thread is provided above the motor mounting hole (36), and the buckle (1022) is tightened to the top of the support column (102).

8. The water pump for a cleaning machine according to claim 6, characterized in that: A coil wire hole (1024) is provided on the peripheral wall of the support column (102) at a position above the positioning step (1023); the motor lead wire (81) of the motor passes through the coil wire hole (1024) into the support column (102) and passes out from the bottom of the support column (102) to the bottom of the disk body (101).

9. The water pump for a cleaning machine according to claim 8, characterized in that: The heating plate (10) further comprises a bottom plate (103) located at the bottom of the plate body (101); a heating tube (1011) and a heating tube wire (1012) connected to the heating tube (1011) are arranged in the plate body (101); a wiring hole (1031) is provided on the bottom plate (103); the motor wire (81) and the heating tube wire (1012) pass through the wiring hole (1031) to the bottom of the bottom plate (103).

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