A centrifugal pump

Abstract

This utility model relates to a centrifugal pump, which includes a pump body, a pump cover, and an elastic element. One end of the pump body has, from the outside to the inside, an axially connected mounting groove, a snap-fit ​​groove, and a receiving groove. The inner diameters of the mounting groove and the receiving groove, projected axially, are smaller than the inner diameter of the snap-fit ​​groove, and the inner diameter of the receiving groove, projected axially, is smaller than or equal to the inner diameter of the mounting groove. The elastic element is radially compressible. The axial dimension of the portion of the pump body snapped into the receiving groove is not less than the axial dimension of the receiving groove. The elastic element is placed in the snap-fit ​​groove and presses the pump cover against the bottom end face of the receiving groove axially. Using this solution, the elastic element can be placed into the snap-fit ​​groove through radial deformation, effectively reducing the complexity of the connection and fixing structure between the pump cover and the pump body. It avoids using bolts to install the pump cover and pump body, eliminates the need for machining connection holes and other structures, and simplifies the connection method and processing cost of the pump cover and pump body.

Description

Technical Field

[0001] This utility model relates to the technical field of liquid transfer, and in particular to a centrifugal pump. Background Technology

[0002] Centrifugal pumps are general-purpose fluid machines that utilize the principle of centrifugal force to transport liquids, and are widely used in industrial, agricultural, construction, and municipal fields. The conventional structure of a centrifugal pump includes a pump body, pump cover, impeller, shaft, and motor. Traditionally, the pump body and pump cover are locked and sealed using bolts or screws in conjunction with sealing rings or gaskets. While this type of structure is reliable, it often requires flange structures to accommodate such connections. Furthermore, tightening the bolts and screws during assembly is very labor-intensive. All of these factors increase the manufacturing and assembly costs of the final product.

[0003] To reduce the manufacturing, assembly, and maintenance costs of water pumps, various connection structures have been developed between the pump body and pump cover. For example, through holes, guide grooves, and stops (CN222526492U) are provided on both the pump body and pump cover. By rotating the pump cover, the guide groove aligns with the through hole, and the stop further limits the movement. While this reduces the need for tools during installation and disassembly, it also increases manufacturing costs due to the added processing difficulty and makes operation more challenging. Therefore, centrifugal pumps lack a simpler structure for installing the pump cover and pump body to reduce the costs associated with manufacturing and installing these components. Utility Model Content

[0004] Based on this, a centrifugal pump is provided to improve the problems of complex installation structure and high installation cost of pump cover and pump body in the prior art.

[0005] On the one hand, this utility model provides a centrifugal pump, which includes:

[0006] The pump body has an axially connected mounting groove, a snap-fit ​​groove, and a receiving groove sequentially opened from the outside to the inside at one end. The inner diameter of the mounting groove and the receiving groove under axial projection is smaller than the inner diameter of the snap-fit ​​groove, and the inner diameter of the receiving groove under axial projection is smaller than or equal to the inner diameter of the mounting groove.

[0007] Pump cover, the pump cover is placed in the receiving groove and abuts against the bottom end face of the receiving groove;

[0008] The elastic element is a radially compressible structure. The axial dimension of the part of the pump body that is inserted into the receiving groove is not less than the axial dimension of the receiving groove. The elastic element is placed in the snap-fit ​​groove and presses the pump cover against the bottom end face of the receiving groove along the axial direction.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] In one implementation, the mounting slot, snap-fit ​​slot, and receiving slot are all circular and coaxially arranged.

[0011] The pump body also includes a guide ramp, which is opened on one end face of the axial end face of the snap-fit ​​groove, close to the mounting groove. The guide ramp extends obliquely from the inner wall of the snap-fit ​​groove toward the inner wall of the mounting groove, forming a tapered structure with gradually increasing inner diameter along the inner wall of the mounting groove to the inner wall of the receiving groove.

[0012] In one implementation, the elastic element is annular and has a radial opening;

[0013] Centrifugal pumps include:

[0014] The sealing ring is located between the pump cover and the receiving groove.

[0015] In one implementation, the pump cover includes:

[0016] The connecting part is an annular tubular structure that protrudes along the middle of the pump cover, and the connecting part extends out of the mounting groove along the middle of the elastic element.

[0017] In one implementation, the receiving groove is connected to a stepped groove along the axial direction and opposite to the snap-fit ​​groove end face, and the outer periphery of the pump cover has a stepped protrusion. The groove and the protrusion cooperate with each other, and the sealing ring surrounds the variable diameter structure of the stepped protrusion of the pump cover.

[0018] In one implementation, the elastic element is a snap ring.

[0019] In one implementation, the pump body includes a mechanical seal chamber, a bearing chamber, a water-throwing trough, and support feet, and the pump body is a cast-in-place structure.

[0020] In one implementation, the centrifugal pump includes:

[0021] The impeller is located within the cavity enclosed by the pump cover and the pump body;

[0022] An electric motor, which includes a shaft for transmitting the rotational power of the motor, passes through a mechanical seal chamber and is connected to an impeller;

[0023] A mechanical seal is located inside a mechanical seal chamber and is annular in shape, surrounding the radial outer circumference of the rotating shaft.

[0024] In one implementation, the pump body includes:

[0025] The bearing is located in the bearing housing and surrounds the outer circumference of the shaft.

[0026] In one implementation, the shaft is axially surrounded by a mechanical seal, a water-throwing channel, and a bearing in sequence.

[0027] The water-spinning trough has a cavity structure that is smaller at the top and larger at the bottom. The upper part of the water-spinning trough surrounds the outer circumference of the rotating shaft, and the bottom of the water-spinning trough is open for the liquid to flow out.

[0028] The beneficial effects of this utility model are as follows: By simultaneously opening a receiving groove and a snap-fit ​​groove at one end of the pump body, the pump cover is placed in the receiving groove, and a radially deformable elastic element is placed in the snap-fit ​​groove. Since the radial inner diameter of the snap-fit ​​groove is larger than that of the receiving groove, the elastic element can be inserted into the snap-fit ​​groove through radial deformation. By controlling the axial dimensions corresponding to the groove and the workpiece, such as limiting the axial dimension of the pump body snapping into the receiving groove to be no less than the axial dimension of the receiving groove, it is ensured that the part of the pump body snapping into the receiving groove protrudes or is flush with the end of the receiving groove near the snap-fit ​​groove, so that the elastic element can axially abut against the pump cover and axially press the pump cover after being inserted. This solution can use the elastic element to axially press the pump cover, thereby achieving the axial position fastening of the pump cover, which effectively reduces the complexity of the connection and fixing structure between the pump cover and the pump body, avoids the use of bolts to install the pump cover and the pump body, and eliminates the need for processing structures such as connection holes, simplifying the connection method and processing cost of the pump cover and the pump body. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the centrifugal pump in one embodiment;

[0030] Figure 2 This is a schematic diagram of the planar structure of a centrifugal pump in one embodiment;

[0031] Figure 3 for Figure 2 Cross-sectional view at point AA;

[0032] Figure 4 for Figure 3 A magnified view of a section at point B in the middle;

[0033] Figure 5 for Figure 3 The cross-sectional view shows a schematic diagram of the pump body shown separately.

[0034] In the attached diagram, the components represented by each number are as follows:

[0035] 1. Pump body; 1-1. Mounting groove; 1-2. Snap-fit ​​groove; 1-3. Receiving groove; 1-4. Guide slope;

[0036] 2. Pump cover; 2-1. Connecting part;

[0037] 3. Elastic components; 4. Sealing rings; 5. Water jetting troughs; 6. Support feet; 7. Impellers; 8. Motors; 9. Mechanical seals; 10. Bearings. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit its scope. It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show components relevant to this utility model and are not drawn according to the actual number, shape, and size of the components. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the component layout may be more complex. The structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model.

[0039] A centrifugal pump, see Figure 2 and Figure 3 The centrifugal pump includes a pump body 1, a pump cover 2, and an elastic element 3. See [link / reference] Figure 4 One end of the pump body 1 has an axially connected mounting groove 1-1, a snap-fit ​​groove 1-2, and a receiving groove 1-3 sequentially opened from the outside to the inside. The inner diameters of the mounting groove 1-1 and the receiving groove 1-3 under axial projection are both smaller than the inner diameter of the snap-fit ​​groove 1-2, and the inner diameter of the receiving groove 1-3 under axial projection is smaller than or equal to the inner diameter of the mounting groove 1-1. The pump cover 2 is placed in the receiving groove 1-3 and abuts against the bottom end face of the receiving groove 1-3. The elastic element 3 has a radially compressible structure. The axial dimension of the part of the pump body 1 that is snapped into the receiving groove 1-3 is not less than the axial dimension of the receiving groove 1-3. The elastic element 3 is placed in the snap-fit ​​groove 1-2 and presses the pump cover 2 against the bottom end face of the receiving groove 1-3 along the axial direction.

[0040] Using the above scheme, see [link / reference] Figure 3 and Figure 4By simultaneously opening a receiving groove 1-3 and a snap-fit ​​groove 1-2 at one end of the pump body 1, the pump cover 2 is placed in the receiving groove 1-3, and the radially deformable elastic element 3 is placed in the snap-fit ​​groove 1-2. Since the radial inner diameter of the snap-fit ​​groove 1-2 is larger than the radial inner diameter of the receiving groove 1-3, the elastic element 3 can be inserted into the snap-fit ​​groove 1-2 through radial deformation. By controlling the axial dimensions corresponding to the groove and the workpiece, such as limiting the axial dimension of the part of the pump body 2 that snaps into the receiving groove 1-3 to be no less than the axial dimension of the receiving groove 1-3, the pump body 2 can be securely inserted. Part of the receiving groove 1-3 protrudes or is flush with one end of the receiving groove 1-3 near the snap-fit ​​groove 1-2, so that after the elastic element 3 is inserted, it can axially abut against the pump cover 2 and axially press the pump cover 2. This solution uses the elastic element 3 to axially press the pump cover 2, thereby achieving the axial position fastening of the pump cover 2, which effectively reduces the complexity of the connection and fixing structure between the pump cover 2 and the pump body 1, avoids the use of bolts to install the pump cover 2 and the pump body 1, and does not require the processing of connection holes and other structures, thus simplifying the connection method and processing cost of the pump cover 2 and the pump body 1.

[0041] In this embodiment, the radial relative relationship between the snap-fit ​​groove 1-2 and the mounting groove 1-1 and the receiving groove 1-3 is defined to ensure that the elastic member 3 can be locked in the snap-fit ​​groove 1-2 after being snapped in, thereby preventing the elastic member 3 from coming out of the snap-fit ​​groove 1-2.

[0042] In the embodiments, see Figure 4 It is clear that since the inner diameter of the receiving groove 1-3 under axial projection is less than or equal to the inner diameter of the mounting groove 1-1, the pump cover 2 enters the pump body 1 along one side of the mounting groove 1-1 on the pump body 1 and is snapped into the receiving groove 1-3. For "the elastic element 3 presses the pump cover 2 against the bottom end face of the receiving groove 1-3 along the axial direction", the elastic element 3 can deform radially and is rigid in the axial direction. The sum of the axial thicknesses of the elastic element 3 and the corresponding positions of the pump cover 2 is the first thickness, and the sum of the axial thicknesses of the snap-fit ​​groove 1-2 and the receiving groove 1-3 is the second thickness. In order to achieve the effect of the elastic element 3 pressing the pump cover 2 axially, the size of the first thickness and the second thickness can be controlled, such as the first thickness and the second thickness being equal, so as to achieve the effect of the elastic element 3 pressing the pump cover 2 axially. Specifically, by controlling the manufacturing tolerance, the elastic element 3 can be snapped into the snap-fit ​​groove 1-2 in a tight fit and simultaneously axially abut against the pump cover 2.

[0043] In the embodiments, see Figure 4The angle between the guide ramp 1-4 of the snap-fit ​​groove 1-2 and the axial direction needs to comprehensively consider factors such as assembly efficiency, structural strength, material properties, and the usage environment. A commonly recommended angle range is 30° to 45°, with the specific selection criteria as follows: If the ramp is too gentle, the retaining spring will have difficulty sliding naturally into the groove by its own weight or axial pressure, requiring additional force; increasing the ramp length may lead to localized material weakness at the groove opening; if the ramp angle is too large, a greater axial force is needed to press the retaining spring into the groove, easily causing plastic deformation of the retaining spring or the groove body. Therefore, while ensuring smooth assembly, maximizing the structural strength of the groove body, and adapting to material properties and the usage environment, a reasonable design of the guide ramp 1-4 angle can significantly improve the reliability, assembly efficiency, and service life of the snap-fit ​​system.

[0044] In some embodiments, see Figure 1 and Figure 4 Mounting slot 1-1, snap-fit ​​slot 1-2, and receiving slot 1-3 are all circular and coaxially arranged; see [link / reference] Figure 4 The pump body 1 also includes a guide slope 1-4. The guide slope 1-4 is opened on one end face of the axial end face of the snap-fit ​​groove 1-2 near the mounting groove 1-1. The guide slope 1-4 extends obliquely from the inner wall of the snap-fit ​​groove 1-2 toward the inner wall of the mounting groove 1-1, forming a tapered structure with a gradually increasing inner diameter along the inner wall of the mounting groove 1-1 to the inner wall of the receiving groove 1-3. In this way, by designing the mounting groove 1-1, the snap-fit ​​groove 1-2, and the receiving groove 1-3 as regular circular grooves, the structure of the mounting groove 1-1, the snap-fit ​​groove 1-2, and the receiving groove 1-3 is simplified, making the processing of the mounting groove 1-1, the snap-fit ​​groove 1-2, and the receiving groove 1-3 simpler and effectively reducing processing costs. Furthermore, a guide slope 1-4 is provided, which guides the elastic element 3 smoothly into the snap-fit ​​groove 1-2, reducing friction and resistance between the elastic element 3 and the snap-fit ​​groove 1-2 during installation. This makes the installation operation more convenient and labor-saving, improves installation efficiency, reduces wear on the elastic element 3 and the snap-fit ​​groove 1-2, and extends the lifespan of the installation. Extended component lifespan; Due to the existence of machining errors and the need to ensure that the pump cover 2 is axially abutted, the sum of the axial dimension of the part of the pump cover 2 that is inserted into the receiving groove 1-3 and the axial dimension of the elastic element 3 can be positive tolerance, while the sum of the axial dimensions of the corresponding snap-fit ​​groove 1-2 and the receiving groove 1-3 is negative tolerance. This setting allows one end face of the elastic element 3 to continue to be abutted against the end face of the pump cover 2, and the other end face of the elastic element 3 to abut against the guide slope 1-4, thereby eliminating the problem of axial clearance after the elastic element 3 is installed, and avoiding the problem that the pump cover 2 cannot be axially abutted or the elastic element 3 cannot be inserted due to machining tolerance issues.

[0045] In some embodiments, see Figure 2The elastic element 3 is annular and has a radial opening. Since the process of inserting the elastic element 3 into the snap-fit ​​groove 1-2 requires radial compression first, an opening is provided in the radial direction of the elastic element 3 to facilitate radial deformation of the elastic element 3 and make it easier to snap the elastic element 3 into the snap-fit ​​groove 1-2.

[0046] In some embodiments, see Figure 4 The centrifugal pump includes a sealing ring 4, which is located between the pump cover 2 and the receiving groove 1-3. Thus, the sealing ring 4 is used to achieve a seal between the pump cover 2 and the receiving groove 1-3, that is, to achieve a seal between the pump cover 2 and the pump body 1.

[0047] In this embodiment, the sealing ring 4 has a certain amount of compression and absorbs a certain amount of compression. Combined with the production tolerances of the parts inserted into the snap-fit ​​groove 1-2 and the receiving groove 1-3, as well as the production tolerances of the groove itself, the pump cover 2 can be pressed against axially by the elastic element 3.

[0048] In some embodiments, see Figure 1 The pump cover 2 includes a connecting part 2-1, which is an annular tubular structure protruding along the middle of the pump cover 2. The connecting part 2-1 extends out of the mounting groove 1-1 along the middle of the elastic member 3. Thus, since the elastic member 3 has an opening in the middle, the connecting part 2-1 is provided on the pump cover 2, and the connecting part 2-1 extends out of the mounting groove 1-1 along the middle of the elastic member 3, thereby facilitating the connection of other pipe structures through the connecting part 2-1.

[0049] In some embodiments, see Figure 4 and Figure 5 The receiving groove 1-3 has a stepped groove connected to its end face along the axial direction and opposite to the snap-fit ​​groove 1-2. The outer periphery of the pump cover 2 has a stepped protrusion. The groove and the protrusion cooperate with each other, and the sealing ring 4 surrounds the variable diameter structure of the stepped protrusion of the pump cover 2. In this way, by setting the connected stepped groove in the receiving groove 1-3, corresponding to the stepped protrusion structure on the outer periphery of the pump cover 2, it is easy to make the stepped protrusion of the pump cover 2 and the stepped groove connected to the receiving groove 1-3 cooperate and abut against each other, thereby realizing the snap-fit ​​of the pump cover 2. In addition, the sealing ring 4 is set at the variable diameter structure of the stepped protrusion of the pump cover 2, so that the sealing ring 4 can be located at the concave and convex snap-fit ​​position of the pump cover 2 and the receiving groove 1-3, thereby achieving the abutment and sealing of the snap-fit ​​position between the pump cover 2 and the pump body 1 by compressing the sealing ring 4.

[0050] In some embodiments, see Figure 2 The elastic element 3 is a retaining ring. In this way, the retaining ring has a simple structure, meets the requirement of radial deformation of the elastic element 3, and, in addition, the retaining ring is a standard part, which makes cost control easier.

[0051] In some embodiments, see Figure 3The pump body 1 includes a mechanical seal chamber 9, a bearing chamber 10, a water-throwing trough 5, and support feet 6. The pump body 1 is a one-piece structure cast in one piece. By making the pump body 1 a one-piece structure, the structure of the pump body 1 can be cast in one piece, reducing the number of parts and the complexity of parts installation, thereby reducing the storage costs of parts and thus reducing product costs and assembly costs.

[0052] In the embodiments, see Figure 1 and Figure 2 The main body of the pump body 1 is annular, with two support legs 6 extending at a certain angle. The support legs 6 have an L-shaped thin plate structure on their vertical sides, and the support plates can be connected to the pump body 1 via detachable bolts. Furthermore, due to the simple structure of the support legs 6, they are versatile and standardized, allowing them to be used in other products, reducing the complexity of the product series corresponding to the support legs 6, and lowering warehousing and production costs. A pump cover 2 is connected to one axial side of the pump body 1, and a motor 8 is connected to the other axial side of the pump body 1.

[0053] In some embodiments, see Figure 3 The centrifugal pump includes an impeller 7, a motor 8, and a mechanical seal 9. The impeller 7 is located in the cavity formed by the pump cover 2 and the pump body 1. The motor 8 includes a rotating shaft for transmitting the rotational power of the motor 8. The rotating shaft passes through the mechanical seal 9 chamber and is connected to the impeller 7. The mechanical seal 9 is located in the mechanical seal 9 chamber and is annular and surrounds the radial outer periphery of the rotating shaft. In this way, the mechanical seal 9 of the centrifugal pump surrounds the radial outer circumference of the motor 8 shaft. This arrangement can effectively prevent media leakage, protect the motor 8 from media damage, reduce friction loss, improve operational stability, extend service life, facilitate installation and maintenance, and enhance adaptability. The low coefficient of friction between the sealing surfaces of the dynamic and static rings of the mechanical seal 9 reduces friction loss during rotation and improves pump efficiency. The mechanical seal 9 can maintain stable sealing performance under high-speed rotation, reducing vibration and noise caused by sealing problems and improving pump operational stability. It reduces leakage and friction, lowers the risk of damage to the seals and motor 8, and extends the overall service life of the pump. In addition, the mechanical seal 9 can adapt to different working conditions and media characteristics, and has a strong adaptability to changes in pump operating conditions.

[0054] In some embodiments, see Figure 3 The pump body 1 includes a bearing 10, which is located in a bearing 10 chamber and surrounds the outer circumference of the rotating shaft. In this way, the bearing 10 provides radial and axial support for the rotating shaft, ensuring stable rotation of the shaft and reducing vibration; the bearing 10 can significantly reduce the friction between the rotating shaft and the pump body 1, improving the operating efficiency of the pump; the bearing 10 reduces friction loss, making the pump run more smoothly and improving overall efficiency.

[0055] In some embodiments, see Figure 3 The rotating shaft is axially surrounded by a mechanical seal 9, a water-throwing groove 5, and a bearing 10. The water-throwing groove 5 has a cavity structure that is smaller at the top and larger at the bottom. The upper part of the water-throwing groove 5 surrounds the outer circumference of the rotating shaft, and the bottom of the water-throwing groove 5 is open for liquid outflow. Thus, the main function of the water-throwing groove 5 is to prevent liquid leakage and reduce liquid entry into the bearing 10 area. The water-throwing groove 5 uses centrifugal force to throw the liquid outward, reducing the diffusion of liquid to the bearing 10 side, protecting the bearing 10 from liquid corrosion, reducing maintenance costs, and extending equipment life. Based on this, this application sets the water-throwing groove 5 axially between the mechanical seal 9 and the bearing 10, so that the liquid coming out along the mechanical seal 9 can also be thrown out through the water-throwing groove 5 and out of the pump body 1 from the bottom opening of the water-throwing groove 5, effectively protecting the bearing 10.

[0056] In the description of this utility model, it should be understood that the terms "thickness," "vertical," "bottom," "inner," "outer," "axial," and "radial," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include at least one of that feature. The terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components or an interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A centrifugal pump, characterized in that, The centrifugal pump includes: The pump body (1) has an axially connected mounting groove (1-1), a snap-fit ​​groove (1-2), and a receiving groove (1-3) sequentially opened from the outside to the inside at one end. The inner diameters of the mounting groove (1-1) and the receiving groove (1-3) under axial projection are both smaller than the inner diameter of the snap-fit ​​groove (1-2), and the inner diameter of the receiving groove (1-3) under axial projection is smaller than or equal to the inner diameter of the mounting groove (1-1). Pump cover (2), the pump cover (2) is placed in the receiving groove (1-3) and abuts against the bottom end face of the receiving groove (1-3); The elastic element (3) is a radially compressible structure. The axial dimension of the part of the pump cover (2) that is inserted into the receiving groove (1-3) is not less than the axial dimension of the receiving groove (1-3). The elastic element (3) is placed in the snap-fit ​​groove (1-2) and presses the pump cover (2) against the bottom end face of the receiving groove (1-3) along the axial direction.

2. The centrifugal pump according to claim 1, characterized in that, The mounting groove (1-1), the snap-fit ​​groove (1-2), and the receiving groove (1-3) are all circular and coaxially arranged; The pump body (1) also includes: A guide slope (1-4) is formed on one end face of the axial end face of the snap-fit ​​groove (1-2) near the mounting groove (1-1). The guide slope (1-4) extends obliquely from the inner wall of the snap-fit ​​groove (1-2) toward the inner wall of the mounting groove (1-1), forming a tapered structure with a gradually increasing inner diameter along the inner wall of the mounting groove (1-1) to the inner wall of the receiving groove (1-3).

3. The centrifugal pump according to claim 1, characterized in that, The elastic element (3) is annular and has a radial opening; The centrifugal pump includes: A sealing ring (4) is located between the pump cover (2) and the receiving groove (1-3).

4. The centrifugal pump according to claim 3, characterized in that, The pump cover (2) includes: The connecting part (2-1) is an annular tubular structure that protrudes along the middle of the pump cover (2) and extends out of the mounting groove (1-1) along the middle of the elastic member (3).

5. The centrifugal pump according to claim 3, characterized in that, The receiving groove (1-3) is connected to a stepped groove along the axial direction and opposite to the end face of the snap-fit ​​groove (1-2). The outer periphery of the pump cover (2) has a stepped protrusion. The groove and the protrusion cooperate with each other. The sealing ring (4) surrounds the variable diameter structure of the stepped protrusion of the pump cover (2).

6. The centrifugal pump according to claim 1 or 3, characterized in that, The elastic element (3) is a retaining ring.

7. The centrifugal pump according to claim 1, characterized in that, The pump body (1) includes a mechanical seal (9) chamber, a bearing (10) chamber, a water-throwing trough (5) and a support foot (6). The pump body (1) is a cast-in-place structure.

8. The centrifugal pump according to claim 7, characterized in that, The centrifugal pump includes: Impeller (7), the impeller (7) is located in the cavity enclosed by the pump cover (2) and the pump body (1); The motor (8) includes a rotating shaft for transmitting the rotational power of the motor (8), the rotating shaft passing through the mechanical seal (9) chamber and connected to the impeller (7); Mechanical seal (9), the mechanical seal (9) is located in the chamber of the mechanical seal (9), the mechanical seal (9) is annular and surrounds the radial outer periphery of the rotating shaft.

9. The centrifugal pump according to claim 8, characterized in that, The pump body (1) includes: A bearing (10) is located in the bearing (10) chamber and surrounds the outer periphery of the shaft.

10. The centrifugal pump according to claim 9, characterized in that, The mechanical seal (9), the water-throwing groove (5), and the bearing (10) are sequentially arranged around the shaft along its axial direction. The water-spraying tank (5) has a cavity structure that is smaller at the top and larger at the bottom. The upper part of the water-spraying tank (5) surrounds the outer circumference of the rotating shaft, and the bottom of the water-spraying tank (5) is open and used for the outflow of liquid.

Images