Upper cover structure and water pump

Abstract

The utility model provides an upper cover structure and a water pump. The upper cover structure comprises a cover body, an upper bearing and a buffer piece. And the cover body is provided with a mounting hole for the rotating shaft to pass through, and is fixed on one side, close to the impeller cavity, of the rotor cavity. And the upper bearing is sleeved on the rotating shaft. The buffering piece is connected with the cover body and the upper bearing and used for buffering the upper bearing. The upper cover structure is located on the side, close to the impeller cavity, of the rotor cavity and can play a role in blocking fluid, the flow channel area of the fluid flowing into the rotor cavity is reduced, the fluid flowing into the rotor cavity is less, impurities and other foreign matter flowing into the rotor cavity are less, and water scale is not prone to being attached and accumulated in the rotor cavity; therefore, filth blockage resistance of the water pump is effectively improved, and the service life of the whole machine is further prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, in particular to an upper cover structure and a water pump. Background Art

[0002] Water pumps (such as submersible pumps, centrifugal pumps, and impeller pumps) are key components in products like cooling fans and humidifiers. They provide the water source for the wet curtains, pressurizing raw water from the tank before flowing through them to achieve evaporation and humidification. In humidification systems, the water pump is typically at the forefront. Poor-quality water, such as tap water, can pass directly through the submersible pump, causing problems such as blockage and failure. Utility Model Content

[0003] Based on this, it is necessary to provide a top cover structure and a water pump to address the problem that the water pump in the prior art is prone to blockage and failure when in use.

[0004] The technical solution is as follows:

[0005] In one aspect, an upper cover structure is provided for use with a water pump, the water pump comprising a pump body having a rotor chamber and an impeller chamber communicating with each other, and a rotating shaft extending from the rotor chamber into the impeller chamber, the upper cover structure comprising:

[0006] a cover body, provided with a mounting hole for the rotating shaft to pass through, and fixed to a side of the rotor chamber close to the impeller chamber;

[0007] an upper bearing, sleeved on the rotating shaft;

[0008] A buffer component is connected to the cover body and the upper bearing and is used for buffering the upper bearing.

[0009] The technical solution is further described below:

[0010] In one embodiment, the cover body includes a cover body provided with the mounting hole, and a first annular protrusion arranged on the side of the cover body away from the impeller chamber, the upper bearing is located in the first annular protrusion, the buffer component includes a buffer body, and an annular buffer protrusion arranged on the side of the buffer body close to the cover body, the annular buffer protrusion fills between the first annular protrusion and the upper bearing, and has an interference fit with the upper bearing.

[0011] In one embodiment, an end of the annular buffer protrusion away from the buffer body is further provided with a buffer extension flange extending radially along the annular buffer protrusion, and the buffer extension flange is filled between the upper bearing and the cover body.

[0012] In one embodiment, a first fixing portion is provided on one side of the cover body where the first annular protrusion is provided, and a second fixing portion is provided on one side of the buffer body where the annular buffer protrusion is provided, and the first fixing portion is fixedly connected to the second fixing portion.

[0013] In one embodiment, the first fixing portion is configured as a second annular protrusion, the second annular protrusion is spaced apart on the outside of the first annular protrusion, and is surrounded by the cover body and the first annular protrusion to form a first annular groove; the second fixing portion is configured as an annular fixing protrusion, the annular fixing protrusion is spaced apart on the outside of the annular buffer protrusion, and is surrounded by the buffer body and the annular buffer protrusion to form a second annular groove; the second annular groove is configured to be plugged into and fitted with the first annular protrusion when the annular fixing protrusion is plugged into and fitted with the first annular groove.

[0014] In one embodiment, the cover, the upper bearing and the buffer are all coaxially arranged.

[0015] On the other hand, a water pump is provided, comprising a pump body, an impeller, a rotating shaft, a rotor, a stator and the upper cover structure, wherein the pump body is provided with the rotor cavity, the impeller cavity and the stator cavity, the impeller is located in the impeller cavity, the rotor is located in the rotor cavity, one end of the rotating shaft is rotatably engaged with the inner wall of the rotor cavity, and the other end passes through the rotor and the upper cover structure and extends into the impeller cavity to be transmission-connected to the impeller, the stator cavity is arranged around the rotor cavity, the stator is installed in the stator cavity, and the impeller is driven to rotate by the rotor and the rotating shaft.

[0016] In one embodiment, the rotor cavity has a mounting opening on one side close to the impeller cavity, the inner diameter of the mounting opening is larger than the inner diameter of the rotor cavity, and the cover is installed in the mounting opening and has an interference fit with the inner wall of the mounting opening.

[0017] In one embodiment, the buffer member is located on a side of the cover body away from the impeller chamber and is provided with a buffer body; the buffer body is arranged in an annular shape and is configured to fill the gap between the cover body and the end face of the mounting port when the cover body is installed on the mounting port, so as to seal the cover body and the end face of the mounting port.

[0018] In one embodiment, the side surface of the cover body close to the impeller chamber is configured to be coplanar with the side surface of the impeller chamber close to the rotor chamber when the upper cover structure is installed on the side of the rotor chamber close to the impeller chamber.

[0019] When the upper cover structure and water pump in the above-mentioned embodiment are in use, the stator drives the rotor to rotate, and the rotor drives the impeller to rotate via the rotating shaft, resulting in a pressure differential within the impeller chamber, thereby drawing fluid into the impeller chamber and discharging it after pressurization, thereby achieving the water pump's function of pressurizing water. Compared with water pumps in the prior art, the water pump in this application has at least the following advantages: 1. The upper cover structure is located on the side of the rotor chamber close to the impeller chamber and can block the fluid, reducing the flow channel area of the fluid flowing into the rotor chamber, resulting in less fluid flowing into the rotor chamber, thereby reducing impurities and other foreign matter flowing into the rotor chamber, and making it less likely for scale to adhere to and accumulate inside the rotor chamber, thereby effectively improving the water pump's resistance to dirt and blockage, and further increasing the service life of the entire machine. 2. By arranging the upper cover structure on the side of the rotor chamber close to the impeller chamber, the flow field within the water pump chamber can be effectively optimized, effectively reducing the turbulence of the fluid within the chamber, thereby making the water pump more stable in operation, with less noise and vibration, and better performance. 3. The upper cover structure can also limit the rotor, effectively preventing the rotor from escaping from the rotor cavity during operation, reducing the axial and radial movement clearance of the rotor, making the rotor more stable during operation, thereby reducing the noise and vibration of the water pump and providing a better experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 A cross-sectional view of a water pump according to an embodiment.

[0023] Figure 2 for Figure 1 Exploded diagram of a water pump.

[0024] Figure 3 for Figure 1 A cross-sectional view of the upper cover structure in FIG.

[0025] Description of reference numerals:

[0026] 10. Water pump; 100. Upper cover structure; 110. Cover body; 111. Mounting hole; 112. Cover body; 113. First annular protrusion; 114. Second annular protrusion; 120. Upper bearing; 130. Buffer member; 131. Buffer body; 132. Annular buffer protrusion; 133. Buffer extension flange; 134. Annular fixing protrusion; 200. Pump body; 210. Rotor cavity; 211. Mounting port; 220. Impeller cavity; 230. Stator cavity; 240. Lower bearing; 250. Casing; 260. Cavity pressure cover; 270. Bottom cover; 300. Impeller; 400. Rotating shaft; 500. Rotor; 600. Stator. DETAILED DESCRIPTION

[0027] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0028] Regarding the water pump in a humidification system, the inventors have discovered through testing that existing water pumps typically consist of a motor and a pump head. The motor converts electrical energy into mechanical energy, powering the pump's impeller, while the pump head converts mechanical energy into fluid kinetic energy, achieving the pump's function of pressurizing and pumping water. The pump head typically houses a rotor and impeller assembly, which redirects the flow of fluid entering the pump and, driven by the motor, increases the fluid's flow rate and pressure.

[0029] The rotor impeller assembly includes an impeller for rotating to change the direction and flow rate of the fluid and a permanent magnet rotor for providing power for the impeller rotation. However, there is a large gap between the existing permanent magnet rotor and the inner wall of the rotor cavity, and the rotor cavity and the impeller cavity are not closed, resulting in the fluid flowing through the impeller cavity and entering the rotor cavity. It is not easy to flow out, making it easy for scale to adhere to and deposit in the rotor cavity, causing the permanent magnet rotor to run stuck and reduce the performance of the water pump. Severe sticking will cause the water pump to burn out, seriously affecting the user experience.

[0030] Based on the above problems, the inventors have designed and proposed the upper cover structure 100 and the water pump 10 of the following embodiments of the present application to solve the above technical problems.

[0031] like Figure 1 and Figure 2As shown, in one embodiment, a water pump 10 is provided, including a pump body 200, an impeller 300, a rotating shaft 400, a rotor 500, a stator 600 and an upper cover structure 100. The pump body 200 is provided with a rotor cavity 210, an impeller cavity 220 and a stator cavity 230. The impeller 300 is located in the impeller cavity 220, and the rotor 500 is located in the rotor cavity 210. One end of the rotating shaft 400 is rotatably engaged with the inner wall of the rotor cavity 210, and the other end passes through the rotor 500 and the upper cover structure 100 and extends into the impeller cavity 220 to be transmission-connected with the impeller 300. The stator cavity 230 is arranged around the rotor cavity 210, and the stator 600 is installed in the stator cavity 230, and drives the impeller 300 to rotate through the rotor 500 and the rotating shaft 400.

[0032] When the water pump 10 in the above embodiment is in use, the stator 600 drives the rotor 500 to rotate, and the rotor 500 drives the impeller 300 to rotate via the rotating shaft 400, so that a pressure difference exists in the impeller chamber 220, so that the fluid is sucked into the impeller chamber 220 and discharged after being pressurized, thereby realizing the pressurized water pumping function of the water pump 10. Compared with the water pump 10 in the prior art, the water pump 10 in the present application has at least the following advantages: 1. The upper cover structure 100 is located on the side of the rotor chamber 210 close to the impeller chamber 220 and can block the fluid, reducing the flow channel area of the fluid flowing into the rotor chamber 210, so that less fluid flows into the rotor chamber 210, and further less impurities and other foreign matter flow into the rotor chamber 210, and scale is less likely to adhere to and accumulate in the rotor chamber 210, thereby effectively improving the water pump 10's ability to resist dirt and blockage, and further improving the service life of the entire machine. 2. By placing the upper cover structure 100 on the side of the rotor cavity 210 close to the impeller cavity 220, the flow field within the water pump 10 cavity can be effectively optimized, effectively reducing the turbulence of the fluid within the cavity, thereby making the water pump 10 more stable in operation, with less noise and vibration, and better performance. 3. The upper cover structure 100 can also limit the rotor 500, effectively preventing the rotor 500 from escaping the rotor cavity 210 during operation, reducing the axial and radial movement clearance of the rotor 500, making the rotor 500 more stable in operation, thereby reducing the noise and vibration of the water pump 10 and providing a better user experience.

[0033] It should be noted that the water pump 10 in the present application can be applied to humidification systems such as cooling fans and humidifiers.

[0034] like Figure 2As shown, the pump body 200 optionally includes a lower bearing 240, which is installed in the rotor cavity 210 and connected to one end of the rotating shaft 400 located in the rotor cavity 210. In this way, the upper cover structure 100 and the lower bearing 240 can cooperate to limit the rotor 500 at both ends along its own axis, effectively preventing the rotor 500 from escaping from the rotor cavity 210 during operation. The double-limiting structure reduces the axial and radial movement clearances of the rotor 500, making the rotor 500 more stable during operation, thereby reducing the noise and vibration of the water pump 10 and providing a better user experience.

[0035] like Figure 1 and Figure 2 As shown, specifically in this embodiment, the pump body 200 includes a shell 250, a cavity gland 260 and a bottom surface cover 270. A rotor cavity 210 is provided inside the shell 250, and the cavity gland 260 is installed on the top of the shell 250, so that the shell 250 and the cavity gland 260 can cooperate to form an impeller cavity 220; the bottom panel is installed on the bottom of the shell 250, so that the shell 250 and the bottom surface cover 270 can cooperate to form a stator cavity 230. Along the axial direction of the rotor 500, the impeller 300, the upper cover structure 100, the rotor 500 and the lower bearing 240 are arranged in sequence from top to bottom, and there is a certain gap between the impeller 300 and the upper cover structure 100. The lower bearing 240 and the housing 250 are tightly fitted, the lower bearing 240 and the rotating shaft 400 are loosely fitted, the rotating shaft 400 and the rotor 500 are tightly fitted, the rotating shaft 400 and the upper cover structure 100 are loosely fitted, and the rotating shaft 400 and the impeller 300 are tightly fitted.

[0036] Specifically, a D-shaped through-hole is provided in the middle of the impeller 300. The rotating shaft 400 is located at the center of the rotor cavity 210. A D-shaped shaft groove is provided at one end of the rotating shaft 400 located within the impeller cavity 220, which plugs into the corresponding D-shaped through-hole to tightly fit the rotating shaft 400 and the impeller 300.

[0037] like Figure 1 、 Figure 2 and Figure 3 As shown, in one embodiment, an upper cover structure 100 is provided for use with a water pump 10. The upper cover structure 100 includes a cover body 110, an upper bearing 120, and a buffer member 130. The cover body 110 is provided with a mounting hole 111 for the rotating shaft 400 to pass through and is fixed to the side of the rotor chamber 210 near the impeller chamber 220. The upper bearing 120 is sleeved on the rotating shaft 400. The buffer member 130 is connected to both the cover body 110 and the upper bearing 120 and is used to buffer the upper bearing 120.

[0038] When the upper cover structure 100 in the above embodiment is used, the cover body 110 is installed on the side of the rotor cavity 210 close to the impeller cavity 220 and can play a role in blocking the fluid, reducing the flow channel area of the fluid flowing into the rotor cavity 210, so that less fluid flows into the rotor cavity 210, and thus less impurities and other foreign matter flow into the rotor cavity 210, and scale is less likely to adhere to and accumulate inside the rotor cavity 210, thereby effectively improving the water pump 10's ability to resist dirt and blockage, and further increasing the service life of the entire machine. In addition, the buffer member 130 can buffer and limit the rotor 500 through the upper bearing 120 and the rotating shaft 400, reducing the radial movement clearance of the rotor 500, making the rotor 500 more stable during operation, and thus making the water pump 10 less noisy and vibrating, and providing a better user experience.

[0039] The buffer member 130 can be configured as a rubber ring, a spring pad or other buffer structures. The buffer member 130 can be connected to the cover 110 and the rotating shaft 400 by snap connection, screw connection, plug connection or other fixing methods.

[0040] Specifically in this embodiment, the cover 110, the upper bearing 120, and the buffer member 130 are all coaxially arranged. The mounting hole 111 is coaxially arranged with the inner hole of the upper bearing 120. This improves the convenience of assembling the upper cover structure 100.

[0041] like Figure 3 As shown, further, the cover body 110 includes a cover body 112 having a mounting hole 111, and a first annular protrusion 113 provided on a side of the cover body 112 away from the impeller chamber 220. The upper bearing 120 is located within the first annular protrusion 113. The buffer member 130 includes a buffer body 131 and an annular buffer protrusion 132 provided on a side of the buffer body 131 close to the cover body 112. The annular buffer protrusion 132 is filled between the first annular protrusion 113 and the upper bearing 120 and has an interference fit with the upper bearing 120. In this way, the cover body 110 and the buffer member 130, as well as the buffer member 130 and the upper bearing 120, can be disassembled, thereby improving the convenience of assembly and maintenance of the upper cover structure 100.

[0042] like Figure 3As shown, optionally, an end of the annular buffer protrusion 132 away from the buffer body 131 is further provided with a buffer extension flange 133 extending radially along the annular buffer protrusion 132, and the buffer extension flange 133 is filled between the upper bearing 120 and the cover body 112. In this way, the cover body 110 can limit the annular buffer protrusion 132 and the buffer extension flange 133, ensuring that the annular buffer protrusion 132 can buffer the radial force of the rotor 500 through the upper bearing 120 and the rotating shaft 400, and the buffer extension flange 133 can buffer the axial force of the rotor 500 through the upper bearing 120 and the rotating shaft 400, so that the axial movement clearance and radial movement clearance of the rotor 500 are reduced, the rotor 500 is more stable during operation, and thus the water pump 10 has less noise and vibration during operation, and a better user experience.

[0043] In one embodiment, the cover body 112 has a first fixing portion on one side where the first annular protrusion 113 is provided, and the buffer body 131 has a second fixing portion on one side where the annular buffer protrusion 132 is provided. The first fixing portion is fixedly connected to the second fixing portion.

[0044] Specifically, in this embodiment, the first fixing portion is configured as a second annular protrusion 114, which is spaced apart from the outside of the first annular protrusion 113 and forms a first annular groove with the cover body 112 and the first annular protrusion 113. The second fixing portion is configured as an annular fixing protrusion 134, which is spaced apart from the outside of the annular buffer protrusion 132 and forms a second annular groove with the buffer body 131 and the annular buffer protrusion 132. The second annular groove is configured to engage with the first annular protrusion 113 when the annular fixing protrusion 134 engages with the first annular groove. This increases the number and area of connection surfaces between the cover body 110 and the buffer member 130, thereby increasing the strength of the connection between the cover body 110 and the buffer member 130 and improving the reliability of the upper cover structure 100.

[0045] Specifically in this embodiment, the cover body 112, the first annular protrusion 113 and the second annular protrusion 114 are integrally formed. The buffer body 131, the annular buffer protrusion 132, the buffer extension flange 133 and the annular fixing portion are integrally formed.

[0046] like Figure 1 and Figure 2 As shown, in one embodiment, the rotor chamber 210 has a mounting opening 211 on one side near the impeller chamber 220. The inner diameter of the mounting opening 211 is larger than the inner diameter of the rotor chamber 210. The cover 110 is mounted in the mounting opening 211 and has an interference fit with the inner sidewall of the mounting opening 211. In this way, the cover 110 and the pump body 200 are removable, and the inner wall of the mounting opening 211 can serve as a positioning function, ensuring that the cover 110 can be quickly and accurately installed in the preset position of the pump body 200, thereby improving the practicality of the upper cover structure 100.

[0047] like Figure 1 and Figure 2 As shown, optionally, a buffer member 130 is located on a side of the cover 110 away from the impeller chamber 220 and includes a buffer body 131. The buffer body 131 is annular and is configured to fill the gap between the cover 110 and the end surface of the mounting opening 211 when the cover 110 is installed in the mounting opening 211, thereby sealing the cover 110 with the end surface of the mounting opening 211. In this way, the buffer member 130 can prevent fluid from flowing into the rotor chamber 210 through the gap between the cover 110 and the pump body 200, thereby improving the reliability of the upper cover structure 100.

[0048] like Figure 1 and Figure 2 As shown, optionally, the side surface of the cover body 110 near the impeller chamber 220 is configured to be coplanar with the side surface of the impeller chamber 220 near the rotor chamber 210 when the upper cover structure 100 is installed on the side of the rotor chamber 210 near the impeller chamber 220. In this way, the fluid flowing into the water pump 10 changes direction and flows out of the water pump 10 after being rotated by the impeller 300. Compared with the water pump 10 in the prior art in which part of the fluid flows into the rotor chamber 210 along the axial direction of the rotor 500, the fluid flowing into the pump body 200 is easier to flow out, which can effectively reduce the turbulence of the fluid inside the cavity of the water pump 10, making the fluid more stable, and the water pump 10 with less noise and vibration, and better performance.

[0049] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0050] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0051] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0052] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0053] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0054] It should also be understood that when explaining the connection relationship or positional relationship of elements, even if not explicitly described, the connection relationship and positional relationship should be interpreted as including a range of error, which should be within the acceptable deviation range of the specific value determined by those skilled in the art. For example, "approximately," "approximately," or "substantially" can mean within one or more standard deviations, which is not limited here.

[0055] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A cover structure, applied to a water pump (10), the water pump (10) comprising a pump body (200) provided with a rotor cavity (210) and an impeller cavity (220) communicating with each other, and a rotating shaft (400) extending from the rotor cavity (210) into the impeller cavity (220), characterized in that: The upper cover structure (100) comprises: A cover (110) is provided with a mounting hole (111) for the rotating shaft (400) to pass through, and is fixed to a side of the rotor cavity (210) close to the impeller cavity (220); An upper bearing (120) sleeved on the rotating shaft (400); The buffer member (130) is connected to both the cover body (110) and the upper bearing (120), and is used to buffer the upper bearing (120).

2. The upper cover structure according to claim 1, characterized in that: The cover body (110) includes a cover body (112) provided with the mounting hole (111), and a first annular protrusion (113) arranged on a side of the cover body (112) away from the impeller chamber (220), the upper bearing (120) is located in the first annular protrusion (113), the buffer member (130) includes a buffer body (131), and an annular buffer protrusion (132) arranged on a side of the buffer body (131) close to the cover body (112), the annular buffer protrusion (132) is filled between the first annular protrusion (113) and the upper bearing (120), and is interference fit with the upper bearing (120).

3. The upper cover structure according to claim 2, characterized in that: An end of the annular buffer protrusion (132) away from the buffer body (131) is further provided with a buffer extension flange (133) extending radially along the annular buffer protrusion (132), and the buffer extension flange (133) is filled between the upper bearing (120) and the cover body (112).

4. The upper cover structure according to claim 2, characterized in that: The cover body (112) is provided with a first fixing portion on one side of the first annular protrusion (113), and a second fixing portion on one side of the buffer body (131) is provided with the annular buffer protrusion (132). The first fixing portion is fixedly connected to the second fixing portion.

5. The upper cover structure according to claim 4, characterized in that: The first fixing portion is configured as a second annular protrusion (114), the second annular protrusion (114) is spaced apart on the outside of the first annular protrusion (113), and is surrounded by the cover body (112) and the first annular protrusion (113) to form a first annular groove; the second fixing portion is configured as an annular fixing protrusion (134), the annular fixing protrusion (134) is spaced apart on the outside of the annular buffer protrusion (132), and is surrounded by the buffer body (131) and the annular buffer protrusion (132) to form a second annular groove; the second annular groove is configured to be plugged into and fitted with the first annular protrusion (113) when the annular fixing protrusion (134) is plugged into and fitted with the first annular groove.

6. The upper cover structure according to any one of claims 1 to 5, characterized in that: The cover body (110), the upper bearing (120) and the buffer member (130) are all coaxially arranged.

7. A water pump, characterized in that: The invention comprises a pump body (200), an impeller (300), a rotating shaft (400), a rotor (500), a stator (600), and an upper cover structure (100) according to any one of claims 1 to 6, wherein the pump body (200) is provided with the rotor cavity (210), the impeller cavity (220), and the stator cavity (230), the impeller (300) is located in the impeller cavity (220), the rotor (500) is located in the rotor cavity (210), and the rotating shaft (400) is provided with the rotor cavity (210). One end of the stator (600) is rotatably engaged with the inner wall of the rotor cavity (210), and the other end passes through the rotor (500) and the upper cover structure (100) and extends into the impeller cavity (220) to be transmission-connected with the impeller (300). The stator cavity (230) is arranged around the rotor cavity (210), and the stator (600) is installed in the stator cavity (230) and drives the impeller (300) to rotate through the rotor (500) and the rotating shaft (400).

8. The water pump according to claim 7, characterized in that A mounting opening (211) is provided on a side of the rotor chamber (210) close to the impeller chamber (220); the inner diameter of the mounting opening (211) is larger than the inner diameter of the rotor chamber (210); the cover (110) is mounted on the mounting opening (211) and is interference-fitted with an inner sidewall of the mounting opening (211).

9. The water pump according to claim 8, characterized in that The buffer member (130) is located on a side of the cover body (110) away from the impeller chamber (220) and is provided with a buffer body (131); the buffer body (131) is arranged in an annular shape and is configured to fill the gap between the cover body (110) and the end surface of the mounting opening (211) when the cover body (110) is installed on the mounting opening (211), so as to seal the cover body (110) and the end surface of the mounting opening (211).

10. The water pump according to any one of claims 7 to 9, characterized in that: The side surface of the cover body (110) close to the impeller chamber (220) is configured to be coplanar with the side surface of the impeller chamber (220) close to the rotor chamber (210) when the upper cover structure (100) is installed on the side of the rotor chamber (210) close to the impeller chamber (220).

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