An uncontrolled electronic water pump and water cooling system

Abstract

The utility model discloses a kind of controlless electronic water pump and water cooling system, the controlless electronic water pump includes: shell, stator is equipped in shell;External plug pin, one end is structured as external end, the other end is arranged in shell and is connected to the stator plug pin of stator.The water cooling system includes the controlless electronic water pump.Make external plug pin adapt to the space in shell and be directly connected to stator plug pin, thus cancel the setting of control panel, reduce the quantity of controlless water pump parts, simplify assembly process, effectively reduce water pump cost, improve water pump reliability.In addition, after canceling control panel, there is also no need to reserve the cavity for installing control panel on shell, so that the volume of shell is reduced, compact structure, the layout of the controlless electronic water pump is more convenient.

Description

Technical Field

[0001] This utility model relates to the field of electronic water pump technology, specifically to an uncontrolled electronic water pump and water cooling system. Background Technology

[0002] An electric water pump is an electrically driven liquid transfer device with a wide range of applications. For example, when used in new energy vehicles, an electric water pump can provide cooling fluid circulation power output for the cooling circuits of major heat-generating components such as motors, electronic controls, and batteries.

[0003] Among them, electronic water pumps in which the control board (such as the PCB board) does not play a control role are called uncontrolled electronic water pumps. In the existing technology, even if the control board does not play a control role, existing uncontrolled electronic water pumps still retain the control board, which leads to the following defects:

[0004] 1. The assembly process involves fixing the control board, welding the stator pins to the control board, and welding the connector pins to the control board. There are many parts, the cost is high, and poor welding can cause the solder joints to burn out when a large current passes through them.

[0005] 2. Electronic water pumps require reserved installation space for the control board, which makes the electronic water pumps relatively large. Utility Model Content

[0006] The technical problem to be solved by this utility model is that existing uncontrolled electronic water pumps retain a control board. The purpose is to provide an uncontrolled electronic water pump and water cooling system to solve the above-mentioned problem.

[0007] This utility model is achieved through the following technical solution:

[0008] In a first aspect, this utility model provides an uncontrolled electronic water pump, comprising:

[0009] The housing contains a stator.

[0010] An external pin has one end configured as an external terminal and the other end inserted into the housing and connected to the stator pin.

[0011] In one possible design, the external pins include three three-phase pins and one grounding pin. The three three-phase pins are connected to phases U, V, and W respectively. The stator is provided with dovetail slots, and the grounding pin is inserted into the dovetail slots and connected by an interference fit.

[0012] In one possible design, the external connector includes an external segment, a through segment, and an internal segment connected in sequence.

[0013] External connectors may use fork-shaped pins, round pins, needle-shaped pins, or cross-shaped solder pins.

[0014] The crossing section includes at least two sub-segments with different directions and angles, and the sub-segments are straight, curved, or polygonal;

[0015] The inner connection section is provided with a first slot or connector at one end for connecting the stator pins; correspondingly, when the external pins are used as three-phase pins, the inner connection section is provided with a first slot; when the external pins are used as grounding pins, the inner connection section is provided with a connector.

[0016] In one possible design, a pin retaining block is provided between the stator and the external pin;

[0017] The pin fixing block includes a ring cover and a pin seat; the ring cover is provided with several buckle plates extending along its axial direction, and the multiple buckle plates are spaced apart in the circumferential direction of the ring cover; correspondingly, the stator is provided with a matching buckle groove.

[0018] The ring cover has two opposing outer surfaces, one of which is on the same side as the buckle plate and forms a second slot for connecting the stator with the buckle plate, and the other outer surface is connected to the pin seat;

[0019] The pin header has three three-phase slots and one grounding slot, and four external pins are inserted into the four slots respectively; correspondingly, the ring cover has an additional structure for the pins to pass through.

[0020] In one possible design, all four slots have external and internal openings, with the four external openings located on the end face of the pin hub.

[0021] The internal opening of the three-phase slot is located on the side of the pin holder. Correspondingly, the ring cover is provided with an additional hole adjacent to the internal opening of the three-phase slot. The stator pin passes through the additional hole and is connected to the three-phase pin.

[0022] The inner opening of the grounding slot is located on the ring cover. Correspondingly, the ring cover is provided with an additional slot and an additional seat. The grounding pin passes through the additional slot and the additional seat in sequence and is then connected to the stator.

[0023] Accordingly, the additional hole, the additional groove, and the additional seat constitute the additional structure.

[0024] In one possible design, the housing includes an upper housing and a lower housing connected together, with a stator and a rotor on the lower housing, and one end of the rotor extending into the upper housing. Accordingly, the gap between the upper housing and the lower housing serves as a liquid-cooled chamber.

[0025] In one possible design, the rotor includes a shaft and an impeller, with one end of the shaft inserted into the stator and the other end of the rotor connected to the impeller by a nut.

[0026] The nut is threaded to the shaft, and there is a welding point between the nut and the shaft formed by laser spot welding; the lower part of the nut is provided with an inwardly extending limiting ring, and correspondingly, the shaft is provided with a limiting groove that fits the limiting ring.

[0027] A ceramic washer is provided below the nut, and a gap is left between the nut and the ceramic washer.

[0028] In one possible design, an annular air gap is left between the rotor and the stator, and the rotor is covered with a metal cladding plate to reduce the width of the air gap.

[0029] The metal cladding plate is constructed of a stainless steel cylinder. One end of the metal cladding plate is used to abut against the rotor, and the other end of the metal cladding plate is provided with an inwardly extending retaining ring. The rotor is provided with a matching retaining groove.

[0030] In one possible design, one end of the lower shell is connected to the upper shell via an annular welded surface. Accordingly, the welded surface is formed by the solidification of molten material melted by the rotational friction between the lower and upper shells.

[0031] Secondly, this utility model provides a water cooling system, including the aforementioned uncontrolled electronic water pump.

[0032] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0033] By adapting the external pins to the internal space of the housing and directly connecting them to the stator pins, the control board is eliminated, reducing the number of parts in the uncontrolled water pump, simplifying the assembly process, effectively lowering the pump cost, and improving the pump reliability. Furthermore, eliminating the control board also eliminates the need for a pre-reserved cavity in the housing for its installation, resulting in a smaller, more compact housing and easier installation of the uncontrolled electronic water pump. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0035] Figure 1 This is a schematic diagram of a non-controllable electronic water pump.

[0036] Figure 2 This is a cross-sectional schematic diagram of an uncontrolled electronic water pump.

[0037] Figure 3 for Figure 1 A schematic diagram of the isometric structure.

[0038] Figure 4 This is a schematic diagram of the assembly of the external pins and the stator.

[0039] Figure 5 This is an assembly diagram of the external pin and the pin fixing block.

[0040] Figure 6This is a schematic diagram of the external connector pin structure.

[0041] Figure 7 This is a schematic diagram of the pin fixing block.

[0042] Figure 8 This is a partially enlarged schematic diagram of the end of the rotating shaft.

[0043] Figure 9 This is a schematic diagram of the structure of a metal-clad plate.

[0044] The attached diagram shows the markings and corresponding component names:

[0045] 1. Housing; 101. Upper housing; 102. Lower housing; 2. External pin; 201. Three-phase pin; 202. Grounding pin; 203. External section; 204. Through section; 205. Internal connection section; 206. Sub-segment; 207. First slot; 208. Connector; 3. Pin fixing block; 301. Ring cover; 302. Pin seat; 303. Buckle plate; 304. Three-phase slot; 305. Grounding slot; 306. Additional slot; 307. Additional seat; 4. Stator; 401. Stator pin; 402. Dovetail slot; 5. Rotor; 501. Shaft; 502. Impeller; 503. Nut; 504. Ceramic gasket; 6. Metal cladding plate. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0047] Example:

[0048] For electronic water pumps, current conduction and signal transmission are achieved through pins. For example, the control board transmits signals to the stator through pins, or external control signals are transmitted to the stator through pins, thereby controlling the flow rate of coolant inside the electronic water pump.

[0049] In the prior art, the pins on an electronic water pump include stator pins mounted on the stator and external pins for connecting to the outside world. The two types of pins are connected by a control board such as a PCB (Printed Circuit Board).

[0050] Specifically: If the control board has corresponding functional modules, the electronic water pump works by transmitting external signals to the control board via external pins. The control board then makes adjustments and transmits the adjustment signals to the stator via stator pins. Conversely, if the control board does not have functional modules, the electronic water pump is controlled by an external controller. In other words, for uncontrolled electronic water pumps, the existing electronic water pump still retains a control board and connects to two types of pins via the control board. In other words, the control board is equivalent to a wire.

[0051] In cases where the control board is used as a wiring harness, the function of the control board is simplified. However, because the control board is retained, the structure and installation of the electric water pump are not simplified. Therefore, as... Figures 1-9 As shown, in a first aspect, this utility model provides a controlless electronic water pump, comprising:

[0052] Housing 1, with stator 4 inside housing 1;

[0053] The external pin 2 has one end configured as an external end, and the other end passes through the housing 1 and is connected to the stator pin 401 of the stator 4.

[0054] The uncontrolled electronic water pump improves the structure of the external connector 2, allowing it to fit within the housing 1 and connect directly to the stator connector 401. This eliminates the need for a control board, reduces the number of parts in the uncontrolled water pump, simplifies the assembly process, effectively lowers the pump cost, and improves its reliability. Furthermore, eliminating the control board also eliminates the need for a pre-reserved chamber on the housing 1 for its installation, resulting in a smaller, more compact housing and easier installation of the uncontrolled electronic water pump.

[0055] In one possible implementation, the external pin 2 includes three three-phase pins 201 and one grounding pin 202. The three three-phase pins 201 are respectively connected to the U phase, V phase and W phase. The stator 4 is provided with a dovetail groove 402. The grounding pin 202 is inserted into the dovetail groove 402 and connected by an interference fit.

[0056] Based on the above design, the three-phase pin 201 corresponds to the three phases of the three-phase electricity, thereby realizing three-phase control, achieving efficient transmission, reducing voltage fluctuations and line losses, and ensuring the stable operation of the uncontrolled electronic water pump. The grounding pin 202 is used to prevent electric shock and protect the water pump. An interference fit is achieved through the dovetail groove 402 to improve the stability and reliability of the connection between the grounding pin 202 and the stator 4.

[0057] It is worth noting that in the prior art, the pins used in electronic water pumps are columnar, such as a columnar structure with a square cross-section. While this structure is simple and easy to manufacture, it is difficult to adapt to the internal space of the housing 1, making direct connection between the external pin 2 and the stator pin 401 impossible. To address this, the structure of the external pin 2 in the uncontrolled electronic water pump has been improved, specifically:

[0058] Optionally, such as Figure 6 As shown, the external connector 2 includes an external segment 203, a through segment 204, and an internal segment 205 connected in sequence;

[0059] External section 203 may use fork-shaped pins, round pins, pin-shaped pins, or cross-shaped solder pins;

[0060] The through section 204 includes at least two sub-segments 206 with different directions and angles, and the sub-segments 206 are straight, curved or broken;

[0061] The inner connection section 205 is provided with a first slot 207 or a connector 208 at one end for connecting the stator pin 401; correspondingly, when the external pin 2 is used as a three-phase pin 201, the inner connection section 205 is provided with a first slot 207; when the external pin 2 is used as a grounding pin 202, the inner connection section 205 is provided with a connector 208.

[0062] Based on the above design, the external connector 203 is used to connect to external devices. Its shape is consistent with the existing pins. Correspondingly, the original pin cavity is retained on the housing 1 and used for the installation of the external connector 203, ensuring that the external pin 2 can be smoothly connected to the external devices, thereby transmitting external signals to the stator 4.

[0063] In other words, the external connector 203 of the external connector 2 of the uncontrolled electronic water pump is equivalent to the external connector 2 in the prior art. Therefore, the external connector 203 can directly use existing connectors, including but not limited to the forked connector, round connector, needle connector and cross-shaped solder connector listed above.

[0064] The through-hole section 204 passes through the housing 1 and changes the extension direction of the external pin 2 so that the external pin 2 extends in the direction of the stator pin 401. Accordingly, the through-hole section 204 includes a plurality of sub-segments 206, which can be constructed in any suitable shape to adapt to different internal spaces of the housing 1.

[0065] The inner connecting section 205 is used to connect the stator pin 401 or the stator 4. Specifically, when the external pin 2 is used as the three-phase pin 201, the inner connecting section 205 is provided with a first slot 207, through which the stator pin 401 passes and abuts against the first slot 207; when the external pin 2 is used as the grounding pin 202, the inner connecting section 205 is provided with a connector 208, which is inserted into the dovetail slot 402 of the stator 4 and connected by interference fit.

[0066] Correspondingly, a pin fixing block 3 is provided between the stator 4 and the external pin 2;

[0067] The pin fixing block 3 includes a ring cover 301 and a pin seat 302; the ring cover 301 is provided with a plurality of buckle plates 303 extending along its axial direction, and the plurality of buckle plates 303 are spaced apart in the circumferential direction of the ring cover 301; correspondingly, the stator 4 is provided with a matching buckle groove.

[0068] The ring cover 301 has two opposing outer surfaces, one of which is on the same side as the buckle plate 303 and forms a second slot for connecting the stator 4 with the buckle plate 303, and the other outer surface is connected to the pin seat 302.

[0069] The pin holder 302 is provided with three three-phase slots 304 and one grounding slot 305, and four external pins 2 are respectively inserted into the four slots; correspondingly, the ring cover 301 is provided with an additional structure for the pins to pass through.

[0070] Based on the above design, the pin fixing block 3 connects to the stator 4 and provides installation space for the external pin 2. On the one hand, it achieves modularity through integration with the external pin 2, allowing for detachable connection to the stator 4 via plugging and unplugging, while also controlling the connection between the external pin 2 and the stator pin 401. On the other hand, it ensures the stability of the external pin 2 within the housing 1, preventing it from being suspended, reducing unexpected disturbances, and guaranteeing the stability of the connection between the external pin 2 and the stator pin 401. Furthermore, the pin fixing block 3 also helps reduce modifications to the internal structure of the housing 1, facilitating the use of existing models and thus reducing economic costs.

[0071] Specifically, the pin retaining block 3 is detachably connected to the stator 4 via the ring cover 301, that is, the stator 4 can be inserted and removed in the second slot. The ring cover 301 increases the number of connection points through multiple fasteners 303, making the connection with the stator 4 more stable. The pin holder 302 is used to install the external pin 2 so that the pin retaining block 3 can adapt to the size of the external pin 2, improving the stability of the external pin 2 after installation.

[0072] Optionally, such as Figure 7 As shown, all four slots have external and internal openings, and all four external openings are located on the end face of the pin holder 302.

[0073] The inner opening of the three-phase slot 304 is located on the side of the pin seat 302. Correspondingly, the ring cover 301 is provided with an additional hole adjacent to the inner opening of the three-phase slot 304. The stator pin 401 passes through the additional hole and is connected to the three-phase pin 201.

[0074] The inner opening of the grounding slot 305 is located on the ring cover 301. Correspondingly, the ring cover 301 is provided with an additional slot 306 and an additional seat 307. The grounding pin 202 passes through the additional slot 306 and the additional seat 307 in sequence and is then connected to the stator 4.

[0075] Accordingly, the additional hole, the additional groove 306, and the additional seat 307 constitute the additional structure.

[0076] Based on the above design, in the external connector 2, the external segment 203 passes through the external opening and is inserted into the slot, while the through segment 204 extends out of the internal opening and toward the stator connector 401. The three-phase connector 201 extends from the side of the connector base 302 and is then connected to the stator connector 401 via the first slot 207 of the internal connecting segment 205; the grounding connector 202 extends along the auxiliary slot 306 into the auxiliary base 307, and then extends and is inserted into the dovetail slot 402 of the stator 4.

[0077] In one possible implementation, the housing 1 includes an upper housing 101 and a lower housing 102 connected together. The lower housing 102 is provided with a stator 4 and a rotor 5, and one end of the rotor 5 extends into the upper housing 101. Correspondingly, the gap between the upper housing 101 and the lower housing 102 is used as a liquid cooling chamber.

[0078] Based on the above design, the housing 1 is divided into two parts: an upper housing 101 and a lower housing 102. The two parts are connected to form a liquid cooling chamber, which is filled with any suitable type of coolant.

[0079] In one possible implementation, the rotor 5 includes a shaft 501 and an impeller 502. One end of the shaft 501 is inserted into the stator 4, and the other end of the rotor 5 is connected to the impeller 502 by a nut 503.

[0080] Nut 503 is threaded to shaft 501, and a welding point formed by laser spot welding is provided between nut 503 and shaft 501; a limiting ring extending inward is provided at the lower part of nut 503, and correspondingly, a limiting groove adapted to the limiting ring is provided on shaft 501.

[0081] A ceramic washer 504 is provided below the nut 503, and a gap is left between the nut 503 and the ceramic washer 504.

[0082] Based on the above design, the rotor 5 can reach speeds of several thousand revolutions per minute during operation, thus generating significant axial impact forces. A nut 503 is used as the connecting component at the junction of the shaft 501 and the impeller 502, which helps to withstand higher axial impact forces and ensures the stability of the rotor 5 during operation. Simultaneously, a limiting structure, namely a limiting ring and a limiting groove, is provided between the nut 503 and the shaft 501. This limiting structure effectively restricts the position of the nut 503, preventing it from contacting the ceramic gasket 504 below, thereby avoiding wear caused by contact. Furthermore, the ceramic gasket 504 provides mechanical and insulation protection, enhancing the internal compressive strength of the electronic water pump.

[0083] Preferably, a welding point formed by laser spot welding is provided between the nut 503 and the rotating shaft 501 to reduce the risk of the nut 503 loosening.

[0084] In one possible implementation, an annular air gap is left between the rotor 5 and the stator 4, and the rotor 5 is covered with a metal cladding plate 6 to reduce the width of the air gap.

[0085] Based on the above design, in an electric water pump, the smaller the gap (i.e., air gap) between the rotor 5 and the stator 4, the better, as a smaller air gap contributes to improved pump performance. However, due to manufacturing errors and the need to ensure coolant flow, the air gap cannot be too small. Furthermore, existing technologies use plastic coverings to encase the rotor 5, but these plastic coverings are affected by coolant temperature, causing dynamic changes in the air gap width and impacting the pump's operational stability. Therefore, a metal covering plate is chosen as a replacement.

[0086] The metal-clad plate 6 not only provides more stable performance and reduces the impact of temperature, but also helps to stabilize and reduce the air gap width, thereby improving the performance of the electric water pump.

[0087] Optionally, the metal cladding plate 6 is constructed as a stainless steel cylinder. It is readily understood that the metal cladding plate 6 can also be made of any other suitable material.

[0088] Optionally, one end of the metal cladding plate 6 is used to abut against the rotor 5, and the other end of the metal cladding plate 6 is provided with an inwardly extending retaining ring, and the rotor 5 is provided with a matching retaining groove. It is readily understood that the metal cladding plate 6 can also be constructed in any other suitable shape, and the present invention does not impose any limitations on this.

[0089] In one possible implementation, one end of the lower housing 102 is connected to the upper housing 101 via an annular welding surface. Accordingly, the welding surface is formed by solidifying the molten material melted by the rotational friction at the contact point between the lower housing 102 and the upper housing 101.

[0090] In the prior art, the housings 101 and 102 of an electronic water pump are connected by screws, which takes up a large volume, is heavy, and has poor sealing performance. Therefore, in the uncontrolled electronic water pump, the upper housing 101 and the lower housing 102 are connected by a welded surface.

[0091] Specifically, one of the upper housing 101 and the lower housing 102 is provided with an outwardly protruding connecting ring, and the other is provided with an inwardly concave annular groove. When the upper housing 101 and the lower housing 102 are connected, the connecting ring is inserted into the annular groove, and then the upper housing 101 and the lower housing 102 are connected by rotational friction welding. The connecting ring and the annular groove generate heat due to friction during high-speed rotation. The heat causes the contact area between the connecting ring and the annular groove to melt and generate molten material. After the molten material solidifies, it forms a welding surface and realizes the connection between the two.

[0092] This improves sealing reliability, eliminates conventional screw connections, and facilitates miniaturization and weight reduction.

[0093] Secondly, this utility model provides a water cooling system, including the aforementioned uncontrolled electronic water pump. Based on this, the water cooling system can also include other suitable functional modules in addition to the uncontrolled electronic water pump, resulting in richer functionality to meet different operational requirements and improved practicality. Furthermore, it is readily understood that the functional modules can be any suitable existing equipment, offering a wide range of choices.

[0094] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A controlless electronic water pump, characterized in that, include: The housing (1) is provided with a stator (4) inside the housing (1); The external pin (2) has one end configured as an external end and the other end inserted into the housing (1) and connected to the stator pin (401) of the stator (4).

2. The uncontrolled electronic water pump according to claim 1, characterized in that, The external pin (2) includes three three-phase pins (201) and one grounding pin (202). The three three-phase pins (201) are connected to the U phase, V phase and W phase respectively. The stator (4) is provided with a dovetail groove (402). The grounding pin (202) is inserted into the dovetail groove (402) and connected by interference fit.

3. The uncontrolled electronic water pump according to claim 2, characterized in that, The external connector (2) includes an external segment (203), a through segment (204), and an internal segment (205) connected in sequence. The external section (203) can be made of fork-shaped pins, round pins, needle-shaped pins or cross-shaped solder pins; The through section (204) includes at least two sub-segments (206) with different directions and angles, and the sub-segments (206) are straight, curved or broken; The inner connection section (205) is provided with a first slot (207) or a connector (208) at one end for connecting the stator pin (401); correspondingly, when the external pin (2) is used as a three-phase pin (201), the inner connection section (205) is provided with a first slot (207); when the external pin (2) is used as a grounding pin (202), the inner connection section (205) is provided with a connector (208).

4. The uncontrolled electronic water pump according to claim 3, characterized in that, A pin fixing block (3) is provided between the stator (4) and the external pin (2); The pin fixing block (3) includes a ring cover (301) and a pin seat (302); the ring cover (301) is provided with a number of buckle plates (303) extending along its axial direction, and the multiple buckle plates (303) are spaced apart in the circumferential direction of the ring cover (301). Correspondingly, the stator (4) is provided with a matching buckle groove. The ring cover (301) has two opposing outer surfaces, one of which is on the same side as the buckle plate (303) and forms a second slot with the buckle plate (303) for connecting the stator (4), and the other outer surface is connected to the pin seat (302). The pin holder (302) is provided with three three-phase slots (304) and one grounding slot (305), and four external pins (2) are respectively inserted into the four slots; correspondingly, the ring cover (301) is provided with an additional structure for the pins to pass through.

5. The uncontrolled electronic water pump according to claim 4, characterized in that, All four slots have external and internal openings, and all four external openings are located on the end face of the pin seat (302); The inner opening of the three-phase slot (304) is located on the side of the pin seat (302). Correspondingly, the ring cover (301) is provided with an additional hole adjacent to the inner opening of the three-phase slot (304). The stator pin (401) passes through the additional hole and is connected to the three-phase pin (201). The inner opening of the grounding slot (305) is located on the ring cover (301). Correspondingly, the ring cover (301) is provided with an additional slot (306) and an additional seat (307). The grounding pin (202) passes through the additional slot (306) and the additional seat (307) in sequence and is then connected to the stator (4). Accordingly, the additional hole, the additional groove (306), and the additional seat (307) constitute the additional structure.

6. The uncontrolled electronic water pump according to any one of claims 1-5, characterized in that, The housing (1) includes an upper housing (101) and a lower housing (102) connected together. The lower housing (102) is provided with a stator (4) and a rotor (5), and one end of the rotor (5) extends into the upper housing (101). Accordingly, the gap between the upper housing (101) and the lower housing (102) is used as a liquid cooling chamber.

7. The uncontrolled electronic water pump according to claim 6, characterized in that, The rotor (5) includes a shaft (501) and an impeller (502). One end of the shaft (501) is inserted into the stator (4), and the other end of the rotor (5) is connected to the impeller (502) by a nut (503). The nut (503) is threaded to the shaft (501), and a welding point formed by laser spot welding is provided between the nut (503) and the shaft (501); the lower part of the nut (503) is provided with an inwardly extending limiting ring, and correspondingly, the shaft (501) is provided with a limiting groove adapted to the limiting ring. A ceramic washer (504) is provided below the nut (503), and a gap is left between the nut (503) and the ceramic washer (504).

8. The uncontrolled electronic water pump according to claim 7, characterized in that, An annular air gap is left between the rotor (5) and the stator (4), and the rotor (5) is covered with a metal cladding plate (6) to reduce the width of the air gap. The metal cladding plate (6) is constructed as a stainless steel cylinder. One end of the metal cladding plate (6) is used to abut against the rotor (5), and the other end of the metal cladding plate (6) is provided with an inwardly extending retaining ring. The rotor (5) is provided with a matching retaining groove.

9. The uncontrolled electronic water pump according to claim 6, characterized in that, One end of the lower shell (102) is connected to the upper shell (101) through an annular welding surface. Correspondingly, the welding surface is formed by solidifying the molten material melted by the rotational friction at the contact point between the lower shell (102) and the upper shell (101).

10. A water-cooling system, characterized in that, Includes the uncontrolled electronic water pump according to any one of claims 1-9.

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