Ironless water pump

Abstract

The utility model provides a kind of no molten iron pump, including shell, shell body is provided with import and export, import coaxial setting in one end of shell, further include: support shaft, with shell coaxial setting, external coaxial rotation cooperation has centrifugal impeller;Rotor, all are plate structure, including two along axial parallel interval setting, all with centrifugal impeller transmission connection;PCB stator, with the plate structure of two rotors parallel setting, with shell connection and located between two rotors by the above setting mode, can effectively reduce the overall size of water pump, greatly reduce the weight of water pump, and in water pump working process, coolant can enter cavity interior, so that PCB stator is soaked in coolant, can effectively heat dissipation to PCB stator, effectively solve the conventional electronic water pump stator heating problem, improve water pump service life.

Description

Technical Field

[0001] This utility model relates to the field of electronic water pump technology, and in particular to an iron-free water pump. Background Technology

[0002] Traditional electric water pumps suffer from various problems, such as complex winding, loose motor structure, heavy stacked silicon steel stator, low output power, severe stator overheating, and excessive noise during operation. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned problems by providing an iron-free water pump.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: an iron-free water pump, including a housing, the housing having an inlet and an outlet, the inlet being coaxially disposed at one end of the housing, and further comprising: The support shaft is coaxially mounted with the outer casing, and a centrifugal impeller is coaxially mounted externally. The rotors are all plate-shaped structures, including two that are spaced apart in parallel along the axial direction, and both are connected to the centrifugal impeller drive. The PCB stator is a plate-shaped structure arranged parallel to the two rotors, connected to the housing and located between the two rotors.

[0005] Furthermore, the centrifugal impeller is coaxially provided with a connecting sleeve, and the two rotors are spaced apart on the connecting sleeve.

[0006] Furthermore, the two rotors are spaced apart from the PCB stator, and a first gap is formed between the PCB stator and the outer peripheral surface of the connecting sleeve. The spaced areas between the two rotors and the PCB stator are all connected to the first gap.

[0007] Furthermore, the housing includes an upper housing and a heat-conducting housing, with the PCB stator positioned between the upper housing and the heat-conducting housing.

[0008] Furthermore, a support sleeve is coaxially provided at the liquid inlet; the upper end of the support shaft is inserted into the support sleeve and the lower end is inserted into the lower housing; a channel is provided through the outer wall of the support sleeve; and the support shaft is configured with a return liquid path.

[0009] Furthermore, along the axial direction, the outer wall of the support shaft is provided with a groove that extends from one end of the support shaft to the other end.

[0010] Furthermore, a circuit board is thermally coupled to the side of the heat-conducting housing away from the upper housing, and the circuit board is covered by a lower housing.

[0011] Compared with the prior art, the iron-free water pump disclosed in this utility model has the following advantages: it can effectively reduce the overall size of the water pump and greatly reduce the weight of the water pump. During the operation of the water pump, the coolant can enter the cavity and immerse the PCB stator in the coolant, which can effectively dissipate heat from the PCB stator, effectively solve the problem of stator overheating in conventional electronic water pumps, and improve the service life of the water pump. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of an iron-free water pump according to the present invention. Figure 1 .

[0013] Figure 2 This is a schematic diagram of the overall structure of an iron-free water pump according to the present invention. Figure 2 .

[0014] Figure 3 This is a schematic diagram of the overall structure of an iron-free water pump according to the present invention. Figure 3 .

[0015] Figure 4 for Figure 3 The diagram shows a cross-sectional view of the iron-free water pump of this invention at point AA.

[0016] Figure 5 for Figure 4 The diagram shown is a partially enlarged structural schematic of point B in an iron-free water pump according to this utility model.

[0017] Figure 6 This is a schematic diagram of the internal structure of the upper casing of an iron-free water pump according to the present invention.

[0018] Figure 7 for Figure 6 The diagram shown is a partially enlarged structural schematic of point C in an iron-free water pump according to this utility model.

[0019] Figure 8 This is a schematic diagram of the structure of the centrifugal impeller and PCB stator in an iron-free water pump according to this utility model.

[0020] Figure 9 This is a schematic diagram of the support shaft in an iron-free water pump according to the present invention.

[0021] Figure 10 This is an exploded structural diagram of the components of the iron-free water pump of this utility model.

[0022] Figure 11 This is a schematic diagram of the magnetic circuit of an iron-free water pump according to the present invention.

[0023] In the diagram: 1. Upper housing; 10. Liquid inlet; 11. Liquid outlet; 12. Support sleeve; 120. Channel; 13. First sealing ring; 2. Heat-conducting housing; 3. Lower housing; 31. Circuit board; 32. Second sealing ring; 4. Centrifugal impeller; 40. Negative pressure zone; 41. Flow channel; 43. Second gap; 5. Support shaft; 51. Tank; 52. Lower gasket; 6. Upper gasket; 7. Back plate; 71. Magnet; 8. PCB stator; 80. First gap; 9. Flow direction. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0025] Please refer to Figure 1-5 , Figure 10 The technical solution of this utility model is as follows: an iron-free water pump, including a housing, the housing being provided with an inlet 10 and an outlet 11, the inlet 10 being coaxially disposed at one end of the housing, and further including: The support shaft 5 is coaxially arranged with the outer casing, and a centrifugal impeller 4 is coaxially rotatably fitted to it. The rotors are all plate-shaped structures, including two that are spaced apart in parallel along the axial direction, and both are connected to the centrifugal impeller 4 for transmission. The PCB stator 8 is a plate-shaped structure arranged parallel to the two rotors, connected to the housing and located between the two rotors.

[0026] Specifically, as one embodiment, this application provides an iron-free water pump, the specific structure of which includes a housing, an inlet 10 coaxially disposed at the upper end of the housing, a support sleeve 12 coaxially disposed at the inlet 10, a cylindrical cavity disposed inside the housing, an upper end of a support shaft 5 inserted into the support sleeve 12, and a lower end inserted into the lower end face of the cavity, a centrifugal impeller 4 rotatably disposed outside the support shaft 5, close to the inlet 10, wherein the rotor includes a back plate 7 disposed on the centrifugal impeller 4 and a plurality of permanent magnets 71 evenly spaced around the support shaft 5, for reference. Figure 11The diagram shows the magnetic circuit of the two stators, located between the two rotors. A PCB stator 8 is fixedly mounted on the outer casing. The PCB stator 8 integrates an electromagnetic coil and has a plate-like structure, which eliminates complex winding processes, reduces the manufacturing process of the windings, and reduces copper loss. During operation, the PCB stator 8 generates a magnetic field when energized, driving the rotor to rotate. The rotor drives the centrifugal impeller 4 to rotate. The centrifugal impeller 4 is equipped with a centrifugal flow channel 41, which generates a negative pressure zone 40 at the liquid inlet 10 under the action of centrifugal force, thereby achieving the pump suction effect. Through the above configuration, the overall size and weight of the water pump can be effectively reduced, and the coolant can enter the cavity during the operation of the water pump, immersing the PCB stator 8 in the coolant, which can effectively dissipate heat from the PCB stator 8, effectively solving the problem of stator overheating in conventional electronic water pumps and improving the service life of the water pump.

[0027] Furthermore, as a specific implementation, the centrifugal impeller 4 is coaxially provided with a connecting sleeve, and the two rotors are spaced apart on the connecting sleeve. Specifically, the centrifugal impeller 4 is coaxially and integrally provided with a connecting sleeve, which is rotatably sleeved outside the support shaft 5. A sliding bearing is provided between the connecting sleeve and the support shaft 5. Axial support and positioning are achieved by an upper shim 6 and a lower shim 52, wherein the upper shim 6 is a ceramic shim and the lower shim 52 is a stainless steel shim.

[0028] For details, please refer to Figure 4 , Figure 5 The back plate 7 of the rotor near the liquid inlet 10 is fitted onto the connecting sleeve and then connected to the back of the centrifugal impeller 4 by means of bonding, screwing, etc. The back plate 7 of the other rotor is fitted onto the connecting sleeve, and the connecting sleeve has a positioning groove to perform axial positioning, ensuring the axial positioning of the two back plates 7 and improving the axial fitting accuracy.

[0029] Furthermore, the two rotors are spaced apart from the PCB stator 8, and a first gap 80 is formed between the PCB stator 8 and the outer peripheral surface of the connecting sleeve. The spaced areas between the two rotors and the PCB stator 8 are all connected to the first gap 80.

[0030] Furthermore, as a specific implementation method, refer to Figure 4 , Figure 5The housing includes an upper housing 1 and a heat-conducting housing 2, with the PCB stator 8 positioned between the upper housing 1 and the heat-conducting housing 2. Specifically, the upper housing 1 is made of plastic, and the heat-conducting housing 2 is cast from aluminum alloy, possessing excellent thermal conductivity. The upper housing 1 and the lower housing 3 have mating steps at their mating parts. During assembly, the PCB stator 8 mates with the mating steps, which clamp and position the two surfaces of the PCB stator 8. This arrangement ensures axial positioning accuracy even during the installation of the PCB stator 8. Preferably, a first sealing ring 13 is provided on the mating end faces of the upper housing 1 and the lower housing 3.

[0031] Further, as a preferred embodiment, a support sleeve 12 is coaxially provided at the liquid inlet 10; the upper end of the support shaft 5 is inserted into the support sleeve 12, and the lower end is inserted into the lower housing 3. A channel 120 is provided through the outer wall of the support sleeve 12, and the support shaft 5 is configured with a return liquid path. Specifically, when the water pump is working, the coolant can fill the cavity, immersing the PCB stator 8 in the coolant to meet the heat dissipation requirements. However, the coolant circulation at the bottom of the cavity is poor, thus limiting the heat exchange effect on the PCB stator 8. To improve the circulation effect of the coolant in the cavity, refer to... Figures 5-9 A channel 120 is provided on the side wall of the plug-in sleeve. The support shaft 5 is configured with a return fluid path. The return fluid path is connected to the lower end of the cavity and the upper end is connected to the channel 120. The channel 120 is connected to the negative pressure zone 40. With the above configuration, when the water pump is working, the outlet of the centrifugal impeller 4 flow channel 41 is the high pressure zone, and the central area near the support shaft 5 is the negative pressure zone 40. The coolant in the high pressure zone can flow to the outlet 11 and the cavity. The end of the channel 120 is connected to the negative pressure zone 40. Thus, the coolant at the lower end of the cavity can flow back to the negative pressure zone 40 through the connection of the return fluid path. The coolant at the end of the cavity near the centrifugal impeller 4 can flow to the bottom, thus forming a liquid flow along the flow direction 9. This liquid flow can flow from the upper and lower surfaces of the PCB stator 8, thereby improving the heat dissipation effect.

[0032] Furthermore, as a specific implementation method, refer to Figure 5 , Figure 9 Along the axial direction, a groove 51 is provided on the outer wall of the support shaft 5, extending from one end of the support shaft 5 to the other end. Specifically, by providing a groove 51 on the outer wall of the support shaft 5, when the groove 51 is inserted into the sliding bearing, the inner circumferential surface of the sliding bearing and the groove 51 together form a return fluid path. A second gap 43 is formed at the lower end of the connecting sleeve, through which the return fluid path can communicate with the cavity.

[0033] In some embodiments, the lower housing 3 is provided with a second insertion sleeve that is inserted and engaged with the lower end of the support shaft 5. A radial hole is provided through the side wall of the second insertion sleeve, and the radial hole (not shown in the figure) is connected to the groove 51.

[0034] Furthermore, as a preferred embodiment, refer to Figure 4 The heat-conducting housing 2 is thermally coupled to a circuit board 31 on the side away from the upper housing 1, and the circuit board 31 is covered by a lower housing 3. Specifically, the circuit board 31 is set in close contact with the heat-conducting housing 2, so that the circuit board 31 can contact the heat-conducting housing 2 for heat transfer. This setting method can improve the heat dissipation effect of the circuit board 31, reduce the probability of the circuit board 31 reaching high temperature, and improve the overall service life of the water pump.

[0035] Furthermore, the lower housing 3 and the heat-conducting housing 2 are detachably and fixedly connected. In order to improve the dustproof effect inside the lower housing 3, a second sealing ring 32 is provided between the lower housing 3 and the heat-conducting housing 2. The sealing effect of the two is improved by the second sealing ring 32, thereby improving the dustproof and waterproof effect.

[0036] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An iron-free water pump, comprising a housing, wherein the housing is provided with an inlet (10) and an outlet (11), the inlet (10) being coaxially disposed at one end of the housing, characterized in that, Also includes: The support shaft (5) is coaxially arranged with the outer casing, and a centrifugal impeller (4) is coaxially rotated on the outside. The rotors are all plate-shaped structures, including two that are spaced apart in parallel along the axial direction, and both are connected to the centrifugal impeller (4) for transmission. The PCB stator (8) is a plate-shaped structure arranged parallel to the two rotors, connected to the housing and located between the two rotors; The centrifugal impeller (4) is coaxially provided with a connecting sleeve, and the two rotors are spaced apart on the connecting sleeve.

2. The iron-free water pump according to claim 1, characterized in that, The two rotors are spaced apart from the PCB stator (8), and a first gap (80) is formed between the PCB stator (8) and the outer peripheral surface of the connecting sleeve. The spaced areas between the two rotors and the PCB stator (8) are connected to the first gap (80).

3. The iron-free water pump according to claim 2, characterized in that, The housing includes an upper housing (1) and a heat-conducting housing (2), with the PCB stator (8) positioned between the upper housing (1) and the heat-conducting housing (2).

4. The iron-free water pump according to claim 3, characterized in that, A support sleeve (12) is coaxially provided at the liquid inlet (10); the upper end of the support shaft (5) is inserted into the support sleeve (12) and the lower end is inserted into the lower housing (3). A channel (120) is provided through the outer wall of the support sleeve (12), and the support shaft (5) is configured with a return liquid path.

5. The iron-free water pump according to claim 4, characterized in that, Along the axial direction, the outer wall of the support shaft (5) is provided with a groove (51) that extends from one end of the support shaft (5) to the other end.

6. The iron-free water pump according to claim 3, characterized in that, The heat-conducting housing (2) is thermally coupled to a circuit board (31) on the side away from the upper housing (1), and the circuit board (31) is covered by a lower housing (3).

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