Pump

Abstract

The utility model discloses a pump which comprises a pump body and a driving part, the driving part and the pump body are installed, the pump body is provided with a containing cavity, the pump is provided with a heating assembly, at least part of the heating assembly is located in the containing cavity, and the heating assembly comprises a base body and a resistive film attached to the base body. The resistive film comprises at least two groups of heating modules, the at least two groups of heating modules are connected in series, and any group of heating module comprises at least two heating units which are connected in parallel; or at least two groups of heating modules are connected in parallel, and any group of heating modules comprises at least two heating units which are connected in series. The pump and the resistive film are connected in series and in parallel, the problem that the whole resistive film fails due to failure of a certain resistor is solved, the service life of the pump is shorter than that of a full parallel connection mode, and the effect of considering the reliability and the service life of the resistive film is achieved.

Description

Technical Field

[0001] This utility model relates to the field of fluid transport technology, particularly to the field of household appliance technology, and especially to a pump. Background Technology

[0002] In some household appliances, such as dishwashers and washing machines, pumps are used to deliver cleaning water. With the increasing demands of production and daily life, heating resistors are used to heat the working fluid within these appliances to improve their efficiency. One type of pump device in related technology uses multiple resistors for heating. These resistors are simply connected in series or parallel. However, either the series connection results in low reliability, or the parallel connection leads to higher voltage resistance and a shorter lifespan. Utility Model Content

[0003] The purpose of this invention is to solve at least one of the problems in the background art by providing a pump.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A pump includes a pump body and a drive unit mounted to the pump body. The pump body has a receiving cavity. The pump has a heating assembly, at least a portion of which is located within the receiving cavity. The heating assembly includes a substrate and a resistive film attached to the substrate. The resistive film includes at least two sets of heating modules.

[0006] At least two sets of the heating modules are connected in series, and each set of the heating modules includes at least two heating units connected in parallel; or, at least two sets of the heating modules are connected in parallel, and each set of the heating modules includes at least two heating units connected in series.

[0007] The pump described above uses a series-parallel connection for the resistive diaphragm. Compared to the all-series connection in the prior art, this solves the problem of the entire resistive diaphragm failing due to the failure of a single resistor. Furthermore, it has a longer service life compared to the all-parallel connection, achieving a balance between the reliability and service life of the resistive diaphragm. Attached Figure Description

[0008] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0009] Figure 1 This is a schematic cross-sectional view of the pump according to the first embodiment;

[0010] Figure 2 This is a schematic diagram of the heating assembly in the first embodiment;

[0011] Figure 3 This is a schematic diagram of the heating assembly in the second embodiment;

[0012] Figure 4 This is a schematic diagram of the heating assembly in the third embodiment;

[0013] Figure 5 This is a schematic diagram of the heating assembly in the fourth embodiment;

[0014] Figure 6 for Figure 1 Enlarged structural diagram at point A;

[0015] Figure 7 for Figure 1 Enlarged structural diagram at point B;

[0016] Figure 8 This is a schematic diagram of the exploded structure of the pump according to the first embodiment;

[0017] Figure 9 This is a schematic diagram illustrating the pump body and water distribution plate structure of the first embodiment;

[0018] Figure 10 This is a schematic diagram illustrating the structure of the lower housing in the first embodiment;

[0019] Figure 11 This is a schematic cross-sectional view of the lower shell and water distribution plate structure of the first embodiment;

[0020] Figure 12 This is a cross-sectional structural schematic diagram of a pump according to another embodiment.

[0021] Figure label:

[0022] 1. Drive unit; 101. Stator coil assembly; 102. Rotor; 2. Pump body; 200. Receiving cavity; 201. Outer shell; 202. Lower shell; 2021. First stepped section; 20211. First horizontal section; 20212. First vertical section; 203. End cover; 2030. Annular groove; 3. Heating assembly; 300. Fluid channel; 301. Heating module; 3011. Heating unit; 31. Base 32. Body; 33. Resistive film; 4. Insulation layer; 5. Inlet section; 6. Outlet section; 7. Pump shaft; 8. Heat insulation section; 9. Gap; 10. Sealing ring; 11. Second horizontal section; 12. Second vertical section; 10. Impeller; 11. Cover; 111. Axial sidewall; 112. Helical blade; 13. Sealing ring; 14. Water distribution plate; 15. Plate section; 16. Cylindrical section; 17. Guide groove; 18. Bearing. Detailed Implementation

[0023] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Other technical solutions obtained by those skilled in the art without creative effort are all within the protection scope of the present utility model. In addition, it should be understood that the following terms such as "upper," "lower," "left," "right," "longitudinal," "transverse," "inner," "outer," "vertical," "horizontal," "top," and "bottom," which indicate orientation or positional relationship, are based only on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, and are not intended to indicate or imply that the device / component must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0024] like Figures 1-4 As shown, a pump in one embodiment includes a pump body 2 and a drive unit 1, the drive unit 1 and the pump body 2 are mounted together, the pump body 2 has a receiving cavity 200, the pump has a heating assembly 3, at least a portion of the heating assembly 3 is located in the receiving cavity 200, the heating assembly 3 includes a base 31 and a resistive film 32 attached to the base 31, the resistive film 32 includes at least two sets of heating modules 301, the at least two sets of heating modules 301 are connected in series, and any set of heating modules 301 includes at least two heating units 3011 connected in parallel.

[0025] The resistive film 32 is used to heat the fluid in household appliances to improve the working efficiency of the appliances. For example, when used in a dishwasher, it heats the fluid flowing through the dishwasher, so that the detergent can clean dishes and other kitchen utensils in the fluid at a certain temperature, thereby improving the cleaning efficiency of the dishwasher. Similarly, when used in a washing machine, the resistive film 32 heats the fluid inside the washing machine, so that the detergent can clean clothes in the fluid at a certain temperature, thereby improving the cleaning efficiency of the washing machine.

[0026] Each heating module 301 includes at least two heating units 3011 connected in parallel. If any heating unit 3011 fails due to a fault such as an open circuit, the heating module 301 can still operate through the other heating units 3011, thus ensuring the resistance film 32 continues to function. Furthermore, since at least two heating modules 301 are connected in series, compared to a fully parallel connection, the power output of a single heating unit in a fully parallel connection is higher under the same voltage than that in a series connection. However, a single heating unit in a fully parallel connection is more prone to damage under prolonged high-power operation. Therefore, the lifespan of the series-parallel heating units in this application is relatively longer than that of a fully parallel connection.

[0027] like Figure 5As shown, in another embodiment, at least two sets of heating modules 301 can be connected in parallel, and each set of heating modules 301 includes at least two heating units 3011 connected in series. In this embodiment, when a set of heating modules 301 fails due to a fault such as an open circuit, the resistive film 32 can still work through another heating module 301, and its service life is also guaranteed to a certain extent.

[0028] like Figures 2-4 As shown, in one embodiment, the resistive film 32 includes at least two sets of heating modules 301, which are connected in series end to end. Each set of heating modules 301 includes at least two heating units 3011 connected in parallel. For example, the number of heating modules 301 can be three or more sets, so as to be distributed on the outer side wall of the substrate 31. A set of heating modules 301 can have two heating units 3011 connected in parallel, or it can have three or more heating units 3011 connected in parallel. In a typical embodiment, considering the actual failure rate and cost of the resistive film 32, a set of heating modules 301 consists of two heating units 3011. When any heating unit 3011 fails due to a fault such as an open circuit, the other heating unit 3011 in the same set of heating modules 301 can still conduct and work, and the resistive film 32 can still be heated.

[0029] In one embodiment, the heating units 3011 of any group of heating modules 301 are arranged in parallel to improve the heating uniformity of the resistive film 32.

[0030] In one embodiment, such as Figures 1-5 As shown, the substrate 31 includes a cylindrical body, and the substrate 31 is at least partially sealed and fixed to the inner wall of the cavity corresponding to the receiving cavity 200. The pump has an inlet 4 and an outlet 5. The substrate 31 has a fluid channel 300 that connects the inlet 4 and the outlet 5. The resistive film 32 is located on the outer wall of the substrate 31, and the heating module 301 is arranged circumferentially along the outer wall of the substrate 31.

[0031] The inner wall of the cylindrical base 31 forms a fluid channel 300. Fluid flows into the pump from the pump inlet 4, passes through the fluid channel 300, and is heated by the resistance membrane 32, before flowing out from the pump outlet 5. In one embodiment, the heating unit 3011 is arranged along the axial direction of the cylindrical base 31, so that the fluid is subjected to continuous heating as much as possible during the flow through the fluid channel 300; in another embodiment, the heating unit 3011 may also be inclined to the axial direction of the base 31.

[0032] In one embodiment, such as Figure 1As shown, the pump includes an impeller 10, at least a portion of which is located in the fluid passage 300 of the base 31. The impeller 10 is connected to the pump shaft 6. The pump includes a cover 11 and a bearing 15. The inner ring of the bearing 15 is fitted onto the pump shaft 6, and the cover 11 is fixed to the outer ring of the bearing 15. The cover 11 has an axial sidewall 111 and a helical blade 112. The helical blade 112 is located between the axial sidewall 111 and the base 31. The cover 11 is located away from the inlet 4 relative to the impeller 10 of the pump. In the axial direction of the pump shaft 6, the orthographic projection range of the cover 11 is larger than the orthographic projection range of the impeller 10. At least a portion of the heating module 301 is opposite to the axial sidewall 111 of the cover 11. The axial sidewall 111 and the helical blade 112 allow the fluid to flow as close as possible to the inner wall of the base 31, thereby improving its heating efficiency.

[0033] like Figure 1 , Figure 5 As shown, in a further embodiment, at least two sets of heating modules 301 are connected in parallel along the axial direction of the substrate 31, wherein at least one set of heating modules 301 is opposite to the axial sidewall 111. Thus, when the fluid flows in the axial direction of the substrate 31, even if a single heating module 301 fails, it can still be heated by another heating module 301 connected in parallel with the failed heating module 301. That is, the fluid flowing along the axial direction of the substrate 31 can always be heated, ensuring the heating efficiency of the fluid. Furthermore, at least a portion of the at least one set of heating modules 301 is opposite to the axial sidewall 111, and the axial sidewall restricts the fluid flow channel, improving the heating efficiency of the heating film.

[0034] like Figure 1 , Figure 4 As shown, in another embodiment, at least two heating units 3011 in any group of heating modules 301 are connected in parallel along the circumferential direction of the base 301, and at least a portion of any heating unit 3011 is opposite to the axial sidewall 111. When at least one heating unit 3011 in any group of heating modules 301 is working, it can heat the fluid between the axial sidewall and the base within a certain range, while the axial sidewall restricts the flow channel of the fluid, thereby ensuring the heating efficiency of the fluid.

[0035] In one embodiment, the substrate 31 has an insulating layer 33, and the resistive film 32 is attached to the insulating layer 33. The insulating layer 33 is used to insulate the substrate 31 from the resistive film 32. If the substrate 31 is made of a metal with good thermal conductivity, such as aluminum or iron, it prevents the substrate 31 from directly contacting the resistive film 32 and causing a short circuit in the resistive film 32. Further, the outer wall of the substrate 31 has an insulating layer 33, and the resistive film 32 is attached to the insulating layer 33. In another embodiment, the inner wall of the substrate 31 may also have an insulating layer 33, and the resistive film 32 may be attached to the insulating layer 33 before another insulating layer 33 is attached to prevent fluid from causing a short circuit in the resistive film 32. Of course, after the resistive film 32 is attached to the insulating layer 33 on the outer wall of the substrate 31, another insulating layer 33 or a protective layer may be attached to enhance the insulation and protection effect.

[0036] In another embodiment, the substrate 31 can be integrally formed using an insulating material, such as quartz, in which case the resistive film 32 can be directly attached to the substrate 31.

[0037] In one embodiment, such as Figure 1 , Figures 6-12 As shown, the pump body 2 includes a housing 201, with a gap 8 between the housing 201 and the outer wall of the base 31, which isolates the pump from the fluid channel 300. The housing 201 protects the resistive film 32, and the gap 8 provides some heat insulation, preventing the housing 201 from overheating and posing a safety hazard to the human body. Alternatively, the gap 8 can be filled with heat-insulating material, such as heat-insulating cotton, to achieve better heat insulation.

[0038] In one embodiment, the pump body 2 includes a lower housing 202, an outer housing 201 fixed to the lower housing 202, an upper end of a base 31 fixed or limited to the outer housing 201, and a lower end of a base 31 fixed or limited to the lower housing 202.

[0039] Furthermore, such as Figure 9 As shown, the outer casing 201 includes an outer casing 201 and an end cap 203. The outer casing 201 and the end cap 203 are integral or fixed. The end cap 203 has an annular groove 2030, and the upper end of the base 31 is sealed and fixed to the annular groove 2030. The groove wall corresponding to the annular groove 2030 is offset inward relative to the side wall of the outer casing 201, thereby creating a gap 8 between the base 31 and the side wall of the outer casing 201.

[0040] The pump has a sealing ring 9, at least a portion of which is located in an annular groove 2030. The sealing ring 9 is fixedly installed in the annular groove 2030 due to its own deformation capability. The sealing ring 9 has a mounting hole, and the upper end of the base 31 is fixedly installed in the mounting hole, thereby sealing and fixing the upper end of the base 31 to the annular groove 2030. In other embodiments, the upper end of the base 31 may also be directly sealed and fixed to the annular groove 2030.

[0041] like Figure 9 As shown, the lower housing 202 has a first stepped portion 2021, which has a first horizontal portion 20211 and a first vertical portion 20212. The lower end of the base 31 abuts against and is limited by the first horizontal portion 20211. The pump includes a sealing ring 12, which is located between the first vertical portion 20212 and the base 31. At least a portion of the first horizontal portion 20211 is opposite to the annular groove 2030, so that the first horizontal portion 20211 can support the lower end of the base 31. The annular groove 2030 cooperates with the first horizontal portion 20211 to fix the base 31. The sealing ring 12 is located between the first vertical portion 20212 and the base 31 to seal the lower end of the base 31 with the lower housing 202. Of course, in other embodiments, the lower end of the base 31 and the first horizontal surface 20211 can also be fixed by engaging with the groove 14. A groove is provided in the first horizontal surface 20211, and the lower end of the base 31 is inserted into the groove for fixation.

[0042] like Figure 1 , Figure 8 As shown, in a further embodiment, the pump includes a heat insulation portion 7, at least a portion of which is located between the outer wall portion of the housing 201 and the outer wall portion of the base 31.

[0043] Specifically, the lower end of the heat insulation part 7 has a second step portion, the second step portion has a second horizontal surface 911 and a second vertical surface 912, the sealing ring 12 is located between the first horizontal surface 911 and the second horizontal surface 911, the second horizontal surface 911 and the sealing ring 12 abut against each other to fix the heat insulation part 7 and achieve a sealing effect.

[0044] In another embodiment, such as Figure 12 As shown, the pump may also be without the heat insulation part 7, and the heat insulation effect can be achieved by the gap 8 between the base 31 and the outer shell 201.

[0045] Furthermore, the drive unit 1 includes a motor component mounted to the pump body 2. The pump also includes a water distribution plate 13, which seals and isolates the stator coil assembly 101 of the motor component from the rotor 102. At least a portion of the rotor 102 of the motor component is located within the inner cavity of the water distribution plate 13, and the pump shaft 6 is connected to the rotor 102. The water distribution plate 13 includes a plate portion 131 and a cylindrical portion 132. The rotor 102 is located within the cavity corresponding to the plate portion 131. The cylindrical portion 132 extends to the fluid channel 300 of the base 31. In the axial direction of the pump shaft 6, the orthographic projection range of the cylindrical portion 132 is larger than the orthographic projection range of the pump impeller 10. The cover 11 is sealed to the cylindrical portion 132. The cover 11 is placed on the upper end of the cylindrical portion 132, and the axial sidewall 111 of the cover 11 is fitted over the cylindrical portion 132, thereby further allowing the fluid to flow as close as possible to the inner wall of the base 31, thereby improving its heating efficiency.

[0046] like Figure 10 , Figure 11 As shown, in one embodiment, the pump further includes a guide channel 14 located between the cylindrical portion 132 and the lower housing 202. The guide channel 14 is spiral-shaped and blocks the axial flow of fluid, guiding the fluid to the outlet portion 5 located on the side of the pump body 2. The guide channel 14, the water distribution plate 13, and the lower housing 202 can be integrally formed, which is very convenient for processing and manufacturing. Furthermore, the guide channel 14 and the water distribution plate 13 can effectively block the fluid from flowing to the coil assembly of the drive portion 1, which is very practical and has a simple structure.

[0047] The above examples illustrate the principles and implementation methods of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A pump, characterized in that, The pump includes a pump body (2) and a drive unit (1), the drive unit (1) being mounted to the pump body (2). The pump body (2) has a receiving cavity (200). The pump has a heating assembly (3), at least a portion of which is located in the receiving cavity (200). The heating assembly (3) includes a substrate (31) and a resistive film (32) attached to the substrate (31). The resistive film (32) includes at least two sets of heating modules (301). At least two sets of the heating modules (301) are connected in series, and each set of the heating modules (301) includes at least two heating units (3011) connected in parallel; or, at least two sets of the heating modules (301) are connected in parallel, and each set of the heating modules (301) includes at least two heating units (3011) connected in series.

2. The pump according to claim 1, characterized in that, The resistive film (32) includes at least two sets of heating modules (301), which are connected in series. Each set of heating modules (301) includes at least two heating units (3011) connected in parallel. The heating units (3011) of each set of heating modules (301) are arranged in parallel.

3. The pump according to claim 1 or 2, characterized in that, The base (31) includes a cylindrical body, and at least a portion of the inner wall of the cavity corresponding to the receiving cavity (200) is sealed, fixed or limited. The pump has an inlet (4) and an outlet (5). The base (31) has a fluid channel (300) that connects the inlet (4) and the outlet (5). The heating module (301) is arranged circumferentially along the outer wall of the base (31).

4. The pump according to claim 3, characterized in that, The base (31) is coaxial with the pump shaft (6) of the pump, and the heating unit (3011) is arranged along the axial direction of the base (31) or the heating unit (3011) is inclined to the axial direction of the base (31).

5. The pump according to claim 1, characterized in that, The pump includes an impeller (10), at least a portion of which is located in a fluid passage (300) of the base (31). The impeller (10) is connected to a pump shaft (6). The pump includes a cover (11) and a bearing (15). The inner ring of the bearing (15) is fitted onto the pump shaft (6). The cover (11) is fixed to the outer ring of the bearing (15). The cover (11) has an axial sidewall (111) and helical blades (1...). 12), the spiral blade (112) is located between the axial sidewall (111) and the base (31), the cover (11) is away from the pump inlet (4) relative to the pump impeller (10), in the axial direction of the pump shaft (6), the orthographic projection range of the cover (11) is larger than the orthographic projection range of the pump impeller (10), and at least a portion of the heating module (301) is opposite to the axial sidewall (111) of the cover (11).

6. The pump according to claim 5, characterized in that, At least two heating units (3011) are connected in parallel along the circumferential direction of the substrate (31), and at least a portion of at least one of the heating units (3011) is opposite to the axial sidewall (111); or, At least two sets of heating modules (301) are connected in parallel along the axial direction of the substrate (31), and at least a portion of at least one set of heating modules (301) is opposite to the axial sidewall (111).

7. The pump according to claim 1, 2, 4, 5, or 6, characterized in that, The substrate (31) has an insulating layer (33), and the resistive film (32) is attached to the insulating layer (33); or the substrate (31) is integrally formed of insulating material, and the resistive film (32) is attached to the substrate (31); or, The pump body (2) includes a housing (201) having a gap (8) between the housing (201) and the outer wall of the base (31), the gap (8) blocking the fluid passage (300) of the base (31); and / or, the pump includes a heat insulation portion (7) at least a portion of which is located between the housing (201) and the outer wall of the base (31).

8. The pump according to claim 7, characterized in that, The pump body (2) includes a lower housing (202), the outer shell (201) is fixed to the lower housing (202), the upper end of the base (31) is fixed or limited to the outer shell (201), and the lower end of the base (31) is fixed or limited to the lower housing (202).

9. The pump according to claim 8, characterized in that, The pump body (2) includes an end cap (203), the outer shell (201) is integral with or fixed to the end cap (203), the end cap (203) has an annular groove (2030), the upper end of the base (31) is sealed and fixed to the annular groove (2030); and / or, the lower shell (202) has a first stepped portion (2021), the first stepped portion (2021) has a first horizontal portion (20211) and a first vertical portion (20212), the lower end of the base (31) abuts against the first horizontal portion (20211), the pump includes a sealing ring (12), the sealing ring (12) is located between the first vertical portion (20212) and the base (31).

10. The pump according to claim 8 or 9, characterized in that, The pump is used in a household appliance. The drive unit (1) includes a motor component mounted on the pump body (2). The pump includes a water distribution plate (13), which seals and isolates the stator coil assembly (101) and rotor (102) of the motor component. The rotor (102) is connected to the pump shaft (6). The water distribution plate (13) includes a plate portion (131) and a cylindrical portion (132). The rotor (102) is located in the cavity corresponding to the plate portion (131). Part of the cylindrical portion (132) is located in the cavity corresponding to the plate portion (131). In the fluid channel (300) of the base (31), in the axial direction of the pump shaft (6) of the pump, the orthographic projection range of the cylindrical part (132) is larger than the orthographic projection range of the impeller (10) of the pump. The cover (11) of the pump is sealed to the cylindrical part (132). The pump includes a guide groove (14), which is located between the cylindrical part (132) and the lower housing (202). The guide groove (14), the water distribution plate (13), and the lower housing (202) are integrally formed.

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