Electronic water pump

Abstract

The utility model provides an electronic water pump which comprises a volute, a shell, a rotating shaft, a spacer bush, an impeller, a rotor and a stator, the volute is fixedly connected to the shell, the spacer bush is arranged between the volute and the shell, and a cavity between the volute and the shell is divided into a cooling cavity and a mounting cavity by the spacer bush; the end, away from the volute, of the rotating shaft is coaxially and fixedly connected with the spacer bush. A via hole is formed between the spacer bush and the rotating shaft. A liquid inlet and a liquid outlet are formed in the volute; the impeller is fixedly connected with the rotor, the impeller is rotationally arranged in the volute, the rotor is coaxially and rotationally arranged in the spacer bush, an annular overflowing gap is formed between the impeller and the spacer bush, and the outer wall of the rotor is in clearance fit with the inner wall of the spacer bush to form an annular channel; a backflow hole is formed in the rotating shaft in the axial direction in a penetrating mode. The liquid outlet, the overflowing gap, the annular channel, the backflow hole and the liquid inlet are sequentially communicated. By reducing the number of parts and optimizing the structure of the parts, the design is simplified on the premise that the cooling requirement is met, and the production and manufacturing cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pump technical field, concretely relates to an electronic water pump. BACKGROUND

[0002] Traditional mechanical water pump relies on the direct drive of the engine, and cannot adjust the pump speed according to the actual demand, resulting in energy waste and low efficiency. The emergence of electronic water pump realizes the accurate control of pump speed through electronic control technology, and improves the energy efficiency and response speed of the system.

[0003] Although the electronic water pump has many advantages, the coil of the existing electronic water pump is easy to heat up during use, which causes the temperature of the rotor and stator of the motor in the electric water pump to rise. Because the coil of the motor is generally wound by enameled wire, as the temperature rises, the risk of short circuit of the enameled wire is greater, so that the motor is easy to burn out due to overheating. Utility model patent: CN212928215U discloses a high-efficiency heat dissipation integrated disc type brushless electronic water pump, which is cooled by water flowing into the pump body and rotor from the flow channel. Although this structure can cool the electronic water pump to some extent, the structure is too complex, the flow channel is difficult to manufacture and has high production cost, and the diameter of the flow channel cannot be set too large, so it cannot carry out more heat, and the heat dissipation effect is limited.

[0004] In summary, there is an urgent need for an electronic water pump to solve or at least partially solve the problems existing in the prior art. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing an electronic water pump, and aims at solving the problem of complex design structure and high production cost of the prior art, and the specific technical scheme is as follows:

[0006] An electronic water pump comprises a volute, a shell, a rotating shaft, a spacer sleeve, an impeller, a rotor and a stator, the volute is fixedly connected to the shell, and a cavity is enclosed between the volute and the shell; the spacer sleeve is arranged between the volute and the shell, and the cavity between the volute and the shell is divided into a cooling cavity and a mounting cavity by the spacer sleeve; the rotating shaft is coaxially arranged in the spacer sleeve, and the end of the rotating shaft away from the volute is fixedly connected to the spacer sleeve; a through hole is arranged between the spacer sleeve and the rotating shaft; the volute is provided with a liquid inlet and a liquid outlet; the impeller and the rotor are coaxially fixedly connected, the impeller is rotationally arranged in the volute, and the rotor is coaxially rotationally arranged in the spacer sleeve; an annular flow gap is arranged between the impeller and the spacer sleeve, the gap between the outer wall of the rotor and the inner wall of the spacer sleeve is matched, and an annular channel is formed; the first end of the flow gap is communicated with the liquid outlet, and the second end of the flow gap is communicated with the annular channel; a reflux hole is arranged in the rotating shaft along the axial direction, the first end of the reflux hole is communicated with the annular channel through the through hole, and the second end of the reflux hole is communicated with the liquid inlet.

[0007] Further, the rotating shaft is integrally formed with the spacer sleeve.

[0008] Further, the rotating shaft is integrally formed with the spacer sleeve.

[0009] Further, the rotating shaft is integrally formed with the spacer sleeve.

[0010] Further, the rotating shaft is integrally formed with the spacer sleeve.

[0011] Further, the rotating shaft is integrally formed with the spacer sleeve.

[0012] Further, the rotating shaft is integrally formed with the spacer sleeve.

[0013] Further, the rotating shaft is integrally formed with the spacer sleeve.

[0014] Further, the rotating shaft is integrally formed with the spacer sleeve.

[0015] Further, the rotating shaft is integrally formed with the spacer sleeve.

[0016] The technical scheme of the present application has the following beneficial effects:

[0017] Liquid flows into the volute of the electronic water pump from the liquid inlet, and under the centrifugal action of the impeller, part of the liquid flows to the liquid outlet, and part of the liquid flows to the liquid inlet through the flow gap, the annular channel, the through hole and the backflow hole in turn, forming a first cooling backflow channel, which simultaneously cools the outer side and the inner side of the motor rotor through the first backflow channel, and cools the inner side of the stator through the first backflow channel, it should be noted that when the liquid flows through the annular channel, not only the inner side of the rotor and the inner side of the stator can be cooled, but also the space between the outer wall of the rotor and the inner wall of the sleeve can be lubricated under the action of the liquid, and the structure is fixed to the shaft through the spacer and the shaft, and the impeller and the rotor are fixedly connected together, through such a structure, during installation, only the sleeve and the shaft formed as a whole are sleeved into the shell, and the rotor and the impeller formed as a whole are sleeved on the shaft, and finally the volute is covered, the installation is completed, the whole installation process is convenient, the number of parts of the whole device is greatly reduced, the design structure is simplified, the structure of the electronic water pump is simplified under the premise of meeting the internal cooling requirements of the electronic water pump, the production and manufacturing cost is reduced, and the stability of the electronic water pump is improved.

[0018] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages. Below, the utility model will be described in detail with reference to the drawings Figures 1-9 The utility model will be described in further detail. DRAWINGS

[0019] The drawings that form a part of the present application are used to provide further understanding of the utility model, the illustrative embodiment of the utility model and the description thereof are used to explain the utility model, and do not constitute undue limitation on the utility model. In the drawings:

[0020] Figure 1 It is the whole structure schematic diagram of an electronic water pump of the utility model;

[0021] Figure 2 It is one of the internal structure schematic diagram of an electronic water pump of the utility model;

[0022] Figure 3 It is Figure 2 The enlarged view of A in Fig. 4;

[0023] Figure 4 It is the second internal structure schematic diagram of an electronic water pump of the utility model;

[0024] Figure 5 It is the explosion view of an electronic water pump of the utility model;

[0025] Figure 6 It is the internal liquid flow direction schematic diagram of an electronic water pump of the utility model;

[0026] Figure 7Is the whole structure schematic diagram of the impeller and the rotor in the electronic water pump of the utility model;

[0027] Figure 8 Is the whole structure schematic diagram of the rotating shaft and the spacer sleeve in the electronic water pump of the utility model;

[0028] Figure 9 Is the internal structure schematic diagram of the shell in the electronic water pump of the utility model.

[0029] Among them, 1, volute;11, cavity;111, cooling cavity;112, installation cavity;12, liquid inlet;13, liquid outlet;14, positioning boss;2, shell;21, containing cavity;22, fin;3, rotating shaft;31, via hole;32, backflow hole;33, positioning step;4, spacer sleeve;41, flow gap;42, annular channel;43, convex strip;5, impeller;51, annular step;52, give place gap;53, mounting hole;54, lubrication groove;6, rotor;7, stator;8, control circuit board;9, heat conduction layer. DETAILED DESCRIPTION

[0030] In order to facilitate understanding of the utility model, the utility model will be described more fully below, and the preferred embodiments of the utility model are given. However, the utility model can be realized in many different forms, and is not limited to the embodiments described in this paper. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing the specific embodiments, and are not intended to limit the utility model.

[0032] Embodiment:

[0033] Referring to Figures 1-9The embodiment provides an electronic water pump, which comprises a volute 1, a shell 2, a rotating shaft 3, a spacer sleeve 4, an impeller 5, a rotor 6 and a stator 7, the volute 1 is fixedly connected to the shell 2, and a cavity 11 is enclosed between the volute 1 and the shell 2; the spacer sleeve 4 is arranged between the volute 1 and the shell 2, and the spacer sleeve 4 divides the cavity 11 between the volute 1 and the shell 2 into a cooling cavity 111 and a mounting cavity 112; the rotating shaft 3 is coaxially arranged in the spacer sleeve 4, and one end of the rotating shaft 3 away from the volute 1 is fixedly connected to the spacer sleeve 4, and a through hole 31 is arranged between the spacer sleeve 4 and the rotating shaft 3; the volute 1 is provided with a liquid inlet 12 and a liquid outlet 13; the impeller 5 is coaxially fixedly connected to the rotor 6, the impeller 5 is rotationally arranged in the volute 1, the rotor 6 is coaxially rotationally arranged in the spacer sleeve 4, an annular flow gap 41 is arranged between the impeller 5 and the spacer sleeve 4, the rotor 6 is gap-fitted with the inner wall of the spacer sleeve 4 and forms an annular channel 42, a first end of the flow gap 41 is communicated with the liquid outlet 13, and a second end of the flow gap 41 is communicated with the annular channel 42; a backflow hole 32 is axially arranged in the rotating shaft 3, a first end of the backflow hole 32 is communicated with the annular channel 42 through the through hole 31, and a second end of the backflow hole 32 is communicated with the liquid inlet 12.

[0034] It should be noted that, during the working of the electronic water pump, the impeller 5 rotates, liquid at the liquid inlet 12 is pumped to the liquid outlet 13, and liquid at the liquid outlet 13 is pumped out; the pressure of liquid close to the liquid inlet 12 of the impeller 5 is lower than the pressure of liquid close to the liquid outlet 13 of the impeller 5.

[0035] It can be known that, liquid flows into the electronic water pump from the liquid inlet 12 of the volute 1, and under the centrifugal action of the impeller 5, the liquid flows to the liquid outlet 13, part of the liquid sequentially flows through the flow gap 41, the annular channel 42, the through hole 31 and the backflow hole 32 and then flows to the liquid inlet 12, forming a first cooling backflow channel, the first backflow channel simultaneously cools the outer side and the inner side of the motor rotor 6 and cools the inner side of the stator 7, and it should be noted that, when the liquid flows through the annular channel 42, the inner side of the rotor 6 and the inner side of the stator 7 can be cooled, and the space between the outer wall of the rotor 6 and the inner wall of the sleeve can be lubricated under the action of the liquid; and the structure is fixed by the lower end of the spacer sleeve 4 and the rotating shaft 3, and the impeller 5 and the rotor 6 are fixedly connected together, through such a structure, during installation, the sleeve and the rotating shaft 3 are sleeved into the shell 2, the rotor 6 and the impeller 5 are sleeved onto the rotating shaft 3, and finally the volute 1 is covered, so that the installation is completed, the whole installation process is convenient, the number of parts of the whole device is greatly reduced, the design structure is simplified, the structure of the electronic water pump is simplified under the premise of meeting the internal cooling requirement of the electronic water pump, the production and manufacturing cost is reduced, and the stability of the electronic water pump is improved.

[0036] It is worth noting that the liquid in the present application can be water, antifreeze or other liquids.

[0037] Further, the rotating shaft 3 and the spacer sleeve 4 are integrally formed. Specifically, the rotating shaft 3 and the spacer sleeve 4 are produced by injection molding, and the material of the rotating shaft 3 and the spacer sleeve 4 is engineering plastic.

[0038] It can be known that, by adopting the structure of integral injection molding of the mold, compared with the structure of assembling and fixing of two parts, the coaxiality of the rotating shaft 3 and the spacer sleeve 4 and the perpendicularity of the end faces of the rotating shaft 3 and the spacer sleeve 4 can be better guaranteed. Secondly, the number of parts is reduced, the assembly difficulty is reduced, which is conducive to improving the assembly efficiency and reducing the production cost. It should be noted that the frame of the impeller 5 and the rotor 6 can be produced by investment casting, and then the permanent magnet needs to be embedded in the rotor 6, and the rotor 6 needs to be plasticized to improve the stability of the rotor 6.

[0039] Further, the rotating shaft 3 is provided with a positioning step 33, the volute 1 is provided with a positioning boss 14, the positioning step 33 and the positioning boss 14 are arranged opposite to each other, and the impeller 5 and the rotor 6 are limited between the positioning step 33 and the positioning boss 14. Specifically, the positioning boss 14 is fixed on the volute 1 by a connecting rod.

[0040] It can be known that, by the positioning step 33 on the rotating shaft 3 and the positioning boss 14 on the volute 1, the impeller 5 and the rotor 6 are axially limited to prevent the impeller 5 and the rotor 6 from axially moving during work.

[0041] Further, the outer periphery of one end of the impeller 5 close to the water inlet of the volute 1 is arranged with an annular step 51, a gap 52 is arranged between the outer periphery of the impeller 5 and the volute 1, and the annular step 51 and the gap 52 are correspondingly arranged; the outer periphery of the annular step 51 and the inner wall of the volute 1 are tightly matched. Specifically, the annular step 51 is arranged at one end of the gap 52 close to the liquid inlet 12, i.e. the upper end of the impeller 5.

[0042] It can be known that, the liquid enters the volute 1 from the liquid inlet 12, and flows towards the liquid outlet 13 under the pumping action of the impeller 5, part of the liquid backflows to the liquid inlet 12 to form leakage through the gap 52, and such leakage directly leads to the decrease of the energy utilization rate of the electronic water pump. By the arrangement of the annular step 51, the annular step 51 reduces the gap between the impeller 5 and the volute 1, and the annular step 51 is arranged at one end of the impeller 5 close to the liquid inlet 12, thereby forming a barrier to the liquid leaking from the gap 52, reducing the leakage amount, and improving the energy utilization rate of the electronic water pump. It is worth noting that the annular step 51 is formed by mechanical cutting, so that the gap between the annular step 51 and the volute 1 is as small as possible, thereby preventing the leakage of the liquid as much as possible.

[0043] Further, the impeller 5 and the middle part of the rotor 6 are coaxially provided with a mounting hole 53, the mounting hole 53 is arranged through the impeller 5 and the rotor 6, and the impeller 5 and the rotor 6 are coaxially rotatably mounted on the rotating shaft 3 through the mounting hole 53.

[0044] It can be known that the whole shell formed by the impeller 5 and the rotor 6 is conveniently coaxially sleeved on the rotating shaft 3 through the mounting hole 53, and the installation and fixation of the rotor 6 and the impeller 5 are conveniently realized.

[0045] Further, the inner wall of the impeller 5 and the rotor 6 is provided with a lubricating groove 54, the lubricating groove 54 is arranged along the axis direction of the mounting hole 53, and the first end of the lubricating groove 54 is communicated with the liquid inlet 12, and the second end of the lubricating groove 54 is communicated with the liquid outlet 13 through the annular channel 42 and the flow gap 41.

[0046] It can be known that the liquid of the liquid inlet 12 is transported to the liquid outlet 13 through the pumping action of the impeller 5, part of the liquid sequentially passes through the flow gap 41, the annular channel 42, the through hole 31, and is returned to the liquid inlet 12 through the lubricating groove 54, forming a second cooling return channel, the inside of the motor rotor 6 is cooled through the second return channel, and the liquid is introduced into the outside of the rotating shaft 3 and the inside of the rotor 6, so that the rotor 6 and the impeller 5 form a liquid film on the outer surface of the rotating shaft 3 and the inner surface of the mounting hole 53 when rotating relative to the rotating shaft 3, reducing the friction between the outer surface of the rotating shaft 3 and the inner surface of the mounting hole 53, reducing the resistance, and improving the energy utilization rate of the electronic water pump.

[0047] Further, the lubricating groove 54 is arranged in multiple, and the multiple lubricating grooves 54 are uniformly and spacedly arranged along the circumferential direction of the hole wall of the mounting hole 53.

[0048] It can be known that by uniformly and spacedly arranging along the circumferential direction of the hole wall of the mounting hole 53, the liquid can smoothly enter between the rotating shaft 3 and the rotor 6, and form a liquid film for lubrication, and the liquid directly contacts the inner wall of the rotor 6, realizing uniform cooling of the inner wall of the rotor 6. In addition, because the liquid has pressure, it will form a thrust on the rotating shaft 3 and the rotor 6, and the uniformly and spacedly arranged multiple lubricating grooves 54 can offset the thrust formed by the liquid, thereby preventing the rotor 6 or the rotating shaft 3 from deflecting to one side and causing the rotor 6 or the rotating shaft 3 to be deflected and abraded.

[0049] Further, the outer surface of the spacer sleeve 4 is arranged with a convex strip 43, the convex strip 43 is arranged in multiple, and the multiple convex strips 43 are uniformly distributed on the outer surface of the spacer sleeve 4, and the spacer sleeve 4 is connected with the stator 7 through interference fit through the convex strip 43.

[0050] It can be known that the stator 7 is fixedly connected in the shell 2 in a manner of interference fit, the spacer sleeve 4 is coaxially sleeved in the shell 2, and the spacer sleeve 4 is coaxially sleeved in the stator 7; the inner wall of the stator 7 is correspondingly provided with a groove; the convex strip 43 on the outer surface of the spacer sleeve 4 is correspondingly and fixedly connected with the groove in the stator 7, and the spacer sleeve 4 is circumferentially limited, thereby preventing the spacer sleeve 4 and the rotating shaft 3 from rotating with the rotor 6 in the rotating process. The spacer sleeve 4 and the volute 1 are sealingly connected through a sealing ring, and the spacer sleeve 4 and the shell 2 are sealingly connected through a sealing ring.

[0051] Further, the control circuit board 8 is further arranged, the bottom of the shell 2 is provided with a containing cavity 21, the control circuit board 8 is arranged on the inner wall of the containing cavity 21 close to the spacer sleeve 4, the side close to the control circuit board 8 of the cooling cavity 111 is provided with a fin 22, the fin 22 is fixedly connected on the shell 2, and the fin 22 extends towards the direction close to the spacer sleeve 4.

[0052] It can be known that the control panel is used for switching on and off the stator 7 coil, thereby indirectly controlling the rotor 6 to rotate at a set rotating speed. Because the control circuit board 8 is also prone to heat, the fin 22 is arranged to cool the control circuit board 8, and the heat on the fin 22 is taken away when the liquid flows through the fin 22, thereby achieving cooling of the fin 22 and the control circuit board 8.

[0053] Further, the control circuit board 8 and the shell 2 are arranged with a heat-conducting layer 9. Specifically, the heat-conducting layer 9 is formed by applying heat-conducting glue.

[0054] It can be known that when the heat-conducting layer 9 is not arranged, there is a gap between the control circuit board 8 and the bottom wall of the shell 2, and the gap is filled with air, and the heat-conducting performance of the air is poor. By arranging the heat-conducting layer 9, the gap is filled, so that the heat generated on the control circuit board 8 can be smoothly transmitted to the shell 2 through the heat-conducting layer 9 and dissipated through the fin 22. The heat-conducting layer 9 is composed of heat-conducting glue.

[0055] The preferred embodiments of the utility model are described above, and are not used for limiting the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An electronic water pump characterized by: The electronic water pump comprises a volute (1), a shell (2), a rotating shaft (3), a spacer sleeve (4), an impeller (5), a rotor (6) and a stator (7), the volute (1) is fixedly connected to the shell (2), and a cavity (11) is enclosed between the volute (1) and the shell (2); The spacer sleeve (4) is arranged between the volute (1) and the shell (2), and the spacer sleeve (4) divides the cavity (11) between the volute (1) and the shell (2) into a cooling cavity (111) and a mounting cavity (112); The rotating shaft (3) is coaxially arranged in the spacer sleeve (4), and one end of the rotating shaft (3) away from the volute (1) is fixedly connected to the spacer sleeve (4), and a through hole (31) is arranged between the spacer sleeve (4) and the rotating shaft (3); The volute (1) is provided with an inlet (12) and an outlet (13); The impeller (5) is coaxially fixedly connected to the rotor (6), the impeller (5) is rotationally arranged in the volute (1), the rotor (6) is coaxially rotationally arranged in the spacer sleeve (4), an annular flow gap (41) is arranged between the impeller (5) and the spacer sleeve (4), the rotor (6) is gap-fitted between the outer wall and the inner wall of the spacer sleeve (4) to form an annular channel (42), the first end of the flow gap (41) is communicated with the outlet (13), and the second end of the flow gap (41) is communicated with the annular channel (42); The rotating shaft (3) is provided with a backflow hole (32) penetrating in the axial direction, the first end of the backflow hole (32) is communicated with the annular channel (42) through the through hole (31), and the second end of the backflow hole (32) is communicated with the inlet (12).

2. The electronic water pump according to claim 1, wherein: The rotating shaft (3) is integrally formed with the spacer sleeve (4).

3. The electronic water pump according to claim 1, wherein: The rotating shaft (3) is provided with a positioning step (33), the volute (1) is provided with a positioning boss (14), the positioning step (33) is arranged opposite to the positioning boss (14), and the impeller (5) and the rotor (6) are limited between the positioning step (33) and the positioning boss (14).

4. The electronic water pump according to claim 1, wherein: The impeller (5) is provided with an annular step (51) on the outer periphery of one end close to the inlet of the volute (1), a gap (52) is arranged between the outer periphery of the impeller (5) and the volute (1), the annular step (51) is arranged corresponding to the gap (52), and the outer periphery of the annular step (51) is tightly fitted with the inner wall of the volute (1).

5. The electronic water pump according to claim 1, wherein: The impeller (5) is coaxially provided with a mounting hole (53) in the middle of the rotor (6), the mounting hole (53) is arranged through the impeller (5) and the rotor (6), and the impeller (5) and the rotor (6) are coaxially rotatably mounted on the rotating shaft (3) through the mounting hole (53).

6. The electronic water pump according to claim 5, characterized in that: The impeller (5) and the inner wall of the rotor (6) are provided with a lubricating groove (54), the lubricating groove (54) is arranged along the axis direction of the mounting hole (53), and the first end of the lubricating groove (54) is communicated with the liquid inlet (12), and the second end of the lubricating groove (54) is communicated with the liquid outlet (13) through the annular channel (42) and the flow gap (41).

7. The electronic water pump according to claim 6, characterized in that: The lubricating groove (54) is arranged in multiple, and multiple lubricating grooves (54) are arranged in a circumferential direction of the hole wall of the mounting hole (53).

8. The electronic water pump according to claim 1, characterized in that: The outer surface of the spacer sleeve (4) is arranged with a convex strip (43), multiple convex strips (43) are arranged on the outer surface of the spacer sleeve (4), and the spacer sleeve (4) is connected with the stator (7) in an interference fit through the convex strip (43).

9. The electronic water pump according to claim 1, characterized in that: Further comprising a control circuit board (8), the bottom of the shell (2) is arranged with a containing cavity (21), the control circuit board (8) is arranged on the inner wall of the containing cavity (21) close to the spacer sleeve (4), the cooling cavity (111) is arranged with a fin (22) close to one side of the control circuit board (8), the fin (22) is fixedly connected to the shell (2), and the fin (22) extends towards the direction close to the spacer sleeve (4).

10. The electronic water pump according to claim 9, characterized in that: The control circuit board (8) and the shell (2) are arranged with a heat conduction layer (9).

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