Water suction pipe assembly and drainage system

Abstract

The utility model discloses a water suction pipe assembly and a drainage system. The water suction pipe assembly comprises a conveying pipeline; the driver is located outside the conveying pipeline; the output shaft is connected with the driver; one end of the transmission shaft is arranged in the conveying pipeline, and the other end of the transmission shaft penetrates through the conveying pipeline and is connected with the output shaft through a connecting sleeve; the impeller is arranged on the transmission shaft and is arranged in the conveying pipeline; a first involute spline is arranged on the inner wall of the connecting sleeve, a second involute spline is arranged on the circumferential face of the output shaft, a third involute spline is arranged on the circumferential face of the transmission shaft, and the second involute spline and the third involute spline are both meshed with the first involute spline.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of drainage, and particularly relates to a water suction pipe assembly and a drainage system. BACKGROUND

[0002] At present, the drainage system of underground mines mainly adopts horizontal multi-stage centrifugal pumps. The starting condition of the multi-stage centrifugal pump is that the pump body and the water suction pipe must be filled with water. The current water filling form mainly sets an impeller in the water suction pipe, and drives the impeller to rotate by a motor to realize water filling of the pump body and the water suction pipe.

[0003] However, in the prior art, there are problems of difficult coaxiality adjustment, low precision and low adjustment efficiency between the output shaft of the motor and the transmission shaft driving the impeller to rotate. CONTENT OF THE UTILITY MODEL

[0004] To solve the above technical problems, the utility model provides a water suction pipe assembly and a drainage system, which aims to at least solve the technical problem of difficult coaxiality adjustment, low precision and low adjustment efficiency between the output shaft of the motor and the transmission shaft driving the impeller to rotate.

[0005] The technical scheme of the utility model is as follows:

[0006] A water suction pipe assembly comprises a conveying pipeline, a driver located outside the conveying pipeline, an output shaft connected with the driver, a transmission shaft with one end arranged in the conveying pipeline and the other end arranged through the conveying pipeline and connected with the output shaft through a connecting sleeve, and an impeller arranged on the transmission shaft and in the conveying pipeline. The inner wall of the connecting sleeve is provided with a first involute spline, the peripheral surface of the output shaft is provided with a second involute spline, and the peripheral surface of the transmission shaft is provided with a third involute spline. The second involute spline and the third involute spline are engaged with the first involute spline.

[0007] In some embodiments, the output shaft has an output part and a first connecting part, and the transmission shaft comprises a transmission part and a second connecting part. One end of the output part is connected with the driver, and the other end is connected with the first connecting part. One end of the transmission part is arranged in the conveying pipeline, and the other end is arranged through the conveying pipeline and connected with the second connecting part. The first connecting part and the second connecting part are at least partially arranged in the connecting sleeve. The peripheral surface of the first connecting part is provided with the second involute spline, and the peripheral surface of the second connecting part is provided with the third involute spline.

[0008] In some embodiments, the water suction pipe assembly further comprises: a first limiting member arranged on the output shaft; and a second limiting member arranged on the transmission shaft and located outside the conveying pipe; wherein the connecting sleeve is located between the first limiting member and the second limiting member, and the distance between the first limiting member and the second limiting member matches the length of the connecting sleeve.

[0009] In some embodiments, the inner diameter of the connecting sleeve matches the diameters of the first connecting portion and the second connecting portion.

[0010] In some embodiments, the conveying pipe is provided with a through hole, and the water suction pipe assembly further comprises: a sealing sleeve connected to the conveying pipe and arranged in the through hole; wherein the transmission shaft is arranged in the sealing sleeve.

[0011] In some embodiments, the water suction pipe assembly further comprises: a bearing seat arranged in the conveying pipe; and a thrust bearing arranged in the bearing seat and connected to the transmission shaft; wherein the impeller is located between the bearing seat and the output shaft.

[0012] In some embodiments, the water suction pipe assembly further comprises: a support seat connected to the driver and the conveying pipe; wherein part of the transmission shaft, the output shaft and the connecting sleeve are arranged in the support seat.

[0013] In some embodiments, the water suction pipe assembly further comprises: a water suction pipe connected to the conveying pipe; and a branch pipe connected to the conveying pipe; wherein the branch pipe is located between the water suction pipe and the impeller.

[0014] In some embodiments, the branch pipe is provided with a one-way valve.

[0015] Based on the same inventive concept, the application further provides a drainage system comprising a centrifugal pump and the water suction pipe assembly, wherein the centrifugal pump is connected to the conveying pipe.

[0016] The application has at least the following beneficial effects:

[0017] Since the driver is located outside the conveying pipe, the output shaft is connected to the driver, one end of the transmission shaft is arranged in the conveying pipe, the other end of the transmission shaft is arranged in the conveying pipe and connected to the output shaft through the connecting sleeve, and the impeller is arranged on the transmission shaft and in the conveying pipe, when water needs to be conveyed, the driver is started to drive the output shaft to rotate, the output shaft drives the transmission shaft to move through the connecting sleeve, and the transmission shaft drives the impeller to rotate to draw water into the conveying pipe and convey the water to the required position through the conveying pipe.

[0018] Since the inner wall of the connecting sleeve has the first involute spline, the peripheral surface of the output shaft has the second involute spline, and the peripheral surface of the transmission shaft has the third involute spline, the second involute spline and the third involute spline are engaged with the first involute spline, so that the design of the involute spline enables the spline teeth to be slightly adjusted along the involute direction, thereby ensuring the center alignment between the output shaft and the transmission shaft, when the output shaft and the transmission shaft are inserted into the connecting sleeve, the interaction of the first involute spline with the second involute spline and the interaction of the first involute spline with the third involute spline will naturally guide the alignment of the output shaft and the transmission shaft, realizing self-centering, through the self-centering connection, it can be ensured that the output shaft and the transmission shaft remain coaxial, avoiding vibration, wear and loss of efficiency caused by misalignment of the shaft, the self-centering connection simplifies the installation process, reduces installation errors, and thus improves the overall installation accuracy.

[0019] Since the first involute spline, the second involute spline and the third involute spline have a large number of teeth, the connecting sleeve has stronger load capacity and can withstand greater torque and axial force, improving the reliability and durability of the transmission system.

[0020] Since the second involute spline and the third involute spline are engaged with the first involute spline, the volume of the connecting sleeve can be reduced, making the structure of the connecting sleeve, the output shaft and the transmission shaft more compact, reducing the overall volume, so as to facilitate the connection of the output shaft and the transmission shaft.

[0021] Since the second involute spline and the third involute spline are engaged with the first involute spline, the contact of the involute tooth surface can be realized, so that the transmission torque is stable, the service life is guaranteed, and the failure rate and maintenance amount are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] Figure 1 Structure schematic view of the water absorption pipe assembly of some embodiments;

[0024] Figure 2 Structure schematic view of the water absorption pipe assembly of some embodiments; Figure 1 Connection schematic view of the output shaft and the transmission shaft of the water absorption pipe assembly;

[0025] Figure 3 Structure schematic view of the output shaft of some embodiments; Figure 1 Connection schematic view of the output shaft and the transmission shaft of the water absorption pipe assembly;

[0026] Figure 4 Structure schematic view of the output shaft of some embodiments;Figure 3 Cross-sectional view of the output shaft.

[0027] In the drawings:

[0028] Delivery conduit 10;

[0029] Driver 20;

[0030] Output shaft 30, output portion 31, first connecting portion 32;

[0031] Transmission shaft 40, transmission portion 41, second connecting portion 42;

[0032] Impeller 50;

[0033] Connecting sleeve 60;

[0034] Sealing sleeve 70;

[0035] Bearing seat 80;

[0036] Thrust bearing 90;

[0037] Support seat 100;

[0038] Water suction pipe 110;

[0039] Branch pipe 120;

[0040] One-way valve 130. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0042] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0045] This application is described below with reference to the accompanying drawings and specific embodiments:

[0046] The water suction pipe assembly and drainage system provided in this embodiment aim to solve, to at least a certain extent, the technical problems of difficulty in adjusting the coaxiality, low precision, and low adjustment efficiency between the output shaft of the motor and the transmission shaft that drives the impeller to rotate.

[0047] Figure 1 This is a schematic diagram of the water suction pipe assembly in some embodiments; Figure 2 for Figure 1 Schematic diagram of the connection between the output shaft and the drive shaft of the middle suction pipe assembly; Figure 3 for Figure 1 Schematic diagram of the output shaft; Figure 4 for Figure 3 A cross-sectional view of the output shaft. Combined with... Figure 1 , Figure 2 , Figure 3 and Figure 4The water suction pipe assembly of this application embodiment includes: a conveying pipe 10, a driver 20, an output shaft 30, a drive shaft 40, and an impeller 50. The driver 20 is located outside the conveying pipe 10. The output shaft 30 is connected to the driver 20. One end of the drive shaft 40 is disposed inside the conveying pipe 10, and the other end passes through the conveying pipe 10 and is connected to the output shaft 30 through a connecting sleeve 60. The impeller 50 is disposed on the drive shaft 40 and inside the conveying pipe 10. The inner wall of the connecting sleeve 60 has a first involute spline, the circumferential surface of the output shaft 30 has a second involute spline, and the circumferential surface of the drive shaft 40 has a third involute spline. Both the second and third involute splines mesh with the first involute spline.

[0048] The driver 20 can be a motor.

[0049] The drive shaft 40 can rotate within the conveying pipe 10.

[0050] Since the driver 20 is located outside the conveying pipe 10, the output shaft 30 is connected to the driver 20, one end of the transmission shaft 40 is located inside the conveying pipe 10, and the other end passes through the conveying pipe 10 and is connected to the output shaft 30 through the connecting sleeve 60. The impeller 50 is located on the transmission shaft 40 and inside the conveying pipe 10. Therefore, when water needs to be conveyed, the driver 20 is started, the driver 20 drives the output shaft 30 to rotate, the output shaft 30 drives the transmission shaft 40 to move through the connecting sleeve 60, and the transmission shaft 40 drives the impeller 50 to rotate, so as to draw water into the conveying pipe 10 and deliver the water to the required location through the conveying pipe 10.

[0051] Because the inner wall of the connecting sleeve 60 has a first involute spline, the circumferential surface of the output shaft 30 has a second involute spline, and the circumferential surface of the drive shaft 40 has a third involute spline, and both the second and third involute splines mesh with the first involute spline, the design of the involute splines allows the spline teeth to be finely adjusted along their involute direction, thereby ensuring center alignment between the output shaft 30 and the drive shaft 40. When the output shaft 30 and the drive shaft 40 are inserted into the connecting sleeve 60, the interaction between the first and second involute splines and the interaction between the first and third involute splines will naturally guide the output shaft 30 and the drive shaft 40 to align, achieving self-centering. Through self-centering connection, it can be ensured that the output shaft 30 and the drive shaft 40 remain coaxial, avoiding vibration, wear, and efficiency loss caused by shaft misalignment. Self-centering connection simplifies the installation process, reduces installation errors, and thus improves the overall installation accuracy.

[0052] Because the first, second, and third involute splines have a large number of teeth, the connecting sleeve 60 has a stronger load-bearing capacity, can withstand greater torque and axial force, and improves the reliability and durability of the transmission system.

[0053] Since both the second and third involute splines mesh with the first involute spline, the volume of the connecting sleeve 60 can be reduced, making the structure of the connecting sleeve 60, output shaft 30, and drive shaft 40 more compact and reducing the overall volume, so as to facilitate the connection between the output shaft 30 and the drive shaft 40.

[0054] Since both the second and third involute splines mesh with the first involute spline, contact between the involute tooth surfaces can be achieved, resulting in smooth torque transmission, ensuring service life, and reducing failure rate and maintenance.

[0055] Combination Figure 1 and Figure 2 To achieve power transmission, the output shaft 30 has an output section 31 and a first connecting section 32, and the drive shaft 40 includes a drive section 41 and a second connecting section 42. One end of the output section 31 is connected to the driver 20, and the other end is connected to the first connecting section 32. One end of the drive section 41 is disposed inside the conveying pipe 10, and the other end passes through the conveying pipe 10 and connects to the second connecting section 42. The first connecting section 32 and the second connecting section 42 are at least partially disposed within the connecting sleeve 60. The circumferential surface of the first connecting section 32 has a second involute spline, and the circumferential surface of the second connecting section 42 has a third involute spline.

[0056] When water needs to be delivered, the driver 20 is activated. The driver 20 drives the output section 31 to rotate, which in turn drives the first connecting section 32 to rotate. The first connecting section 32, through the connecting sleeve 60, drives the second connecting section 42 to move. The second connecting section 42, through the transmission section 41, drives the impeller 50 to rotate, thereby drawing water into the delivery pipe 10 and delivering the water to the desired location through the delivery pipe 10.

[0057] In some embodiments, the output portion 31 and the first connecting portion 32 can be integrally formed, and the transmission portion 41 and the second connecting portion 42 can be integrally formed.

[0058] In some embodiments, when the connecting sleeve 60 is fitted onto the first connecting portion 32 and the second connecting portion 42, to prevent the connecting sleeve 60 from moving axially along the output shaft 30, the suction pipe assembly further includes: a first limiting member disposed on the output shaft 30; and a second limiting member disposed on the transmission shaft 40 and located outside the conveying pipe 10. The connecting sleeve 60 is located between the first and second limiting members, and the distance between the first and second limiting members matches the length of the connecting sleeve 60. By limiting the connecting sleeve 60 with the first and second limiting members, axial movement of the connecting sleeve 60 along the output shaft 30 can be prevented, thus ensuring the position of the connecting sleeve 60 is determined and preventing separation of the connecting sleeve 60 from the first connecting portion 32 and the second connecting portion 42. This ensures the stability of the connection between the connecting sleeve 60 and the first and second connecting portions 32, allowing the power of the driver 20 to be transmitted to the transmission shaft 40 through the output shaft 30.

[0059] In some embodiments, the first limiting member may be provided on the output part 31 or the first connecting part 32, and the second limiting member may be provided on the transmission part 41 or the second connecting part 42.

[0060] In some embodiments, when connecting the output shaft 30 and the drive shaft 40, the connecting sleeve 60 is fitted onto the second connecting portion 42 so that the first involute spline engages with the third involute spline. Then, the first connecting portion 31 is aligned with the connecting sleeve 60 and inserted into the connecting sleeve 60 so that the first involute spline engages with the second involute spline. The interaction between the first and second involute splines and the interaction between the first and third involute splines will naturally guide the output shaft 30 and the drive shaft 40 to align, achieving self-centering. Through self-centering connection, it can be ensured that the output shaft 30 and the drive shaft 40 remain coaxial, avoiding vibration, wear and efficiency loss caused by shaft misalignment. Self-centering connection simplifies the installation process, reduces installation errors, and thus improves the overall installation accuracy.

[0061] In some embodiments, in order to ensure the stability of the connection between the first connecting part 32 and the second connecting part 42 and the connecting sleeve 60, the inner diameter of the connecting sleeve 60 matches the diameter of the first connecting part 32 and the diameter of the second connecting part 42. The matching inner diameter and diameter ensure that the first connecting part 32 and the second connecting part 42 can be tightly and accurately inserted into the connecting sleeve 60, avoiding loosening or instability caused by excessive gaps, and improving the stability and reliability of the entire connection.

[0062] Combination Figure 1In some embodiments, to prevent water leakage within the conveying pipe 10, the conveying pipe 10 is provided with a through hole, and the water suction pipe assembly further includes a sealing sleeve 70. The sealing sleeve 70 is connected to the conveying pipe 10 and is disposed within the through hole. The drive shaft 40 passes through the sealing sleeve 70, and the sealing sleeve 70 seals the gap between the through hole and the drive shaft 40, thus ensuring the airtightness of the conveying pipe 10.

[0063] In some embodiments, the interference fit between the sealing sleeve 70 and the through hole ensures that the drive shaft 40 can rotate while achieving a mechanical seal at the through hole. The sealing sleeve 70 uses standardized, serialized and universal parts, has a long service life and a low probability of failure.

[0064] Combination Figure 1 In some embodiments, to ensure the stability of the rotation of the drive shaft 40, the suction pipe assembly further includes a bearing housing 80 and a thrust bearing 90. The bearing housing 80 is disposed within the conveying pipe 10. The thrust bearing 90 is disposed within the bearing housing 80 and connected to the drive shaft 40. The bearing housing 80 supports the thrust bearing 90 to ensure the stability of its installation. The impeller 50 is located between the bearing housing 80 and the output shaft 30, and the thrust bearing 90 supports the drive shaft 40, ensuring smooth rotation of the shaft 40.

[0065] Combination Figure 1 In some embodiments, to support the driver 20, the suction pipe assembly further includes a support base 100. The support base 100 is connected to the driver 20 and the delivery pipe 10, with the delivery pipe 10 supporting the support base 100 and the driver 20 being supported by the support base 100. A portion of the drive shaft 40, the output shaft 30, and the connecting sleeve 60 are disposed within the support base 100. The actuating end of the driver 20 is connected to the output shaft 30, and the fixed end of the driver 20 is connected to the support base 100.

[0066] In some embodiments, the center of the support base 100 is hollowed out, which does not affect the connection between the drive shaft 40 and the output shaft 30 through the connecting sleeve 60.

[0067] Combination Figure 1 In some embodiments, to facilitate water delivery, the suction pipe assembly further includes a suction pipe 110 and a branch pipe 120. The suction pipe 110 is connected to the delivery pipe 10. The branch pipe 120 is also connected to the delivery pipe 10. The branch pipe 120 is located between the suction pipe 110 and the impeller 50. The suction pipe 110 is connected to the centrifugal pump. A one-way valve 130 is provided within the branch pipe 120.

[0068] When the driver 20 operates, it drives the output shaft 30 to rotate. The output shaft 30, through the connecting sleeve 60, drives the transmission shaft 40 to rotate. The transmission shaft 40 drives the impeller 50 to rotate, centrifugally pressurizing water into the delivery pipe 10, the suction pipe 110, and the centrifugal pump. Water injection is completed within a set time, and the centrifugal pump starts operating. After the centrifugal pump reaches normal operating conditions, the driver 20 is turned off. External water enters the branch pipe 120, passes through the one-way valve 130 into the delivery pipe 10, and then through the delivery pipe 10 into the suction pipe 110. The centrifugal pump is supplied with water by the branch pipe 120.

[0069] Based on the same inventive concept, this application also proposes a drainage system that uses the aforementioned suction pipe assembly. The specific structure of the suction pipe assembly is as described in the above embodiments. Since it adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0070] In some embodiments, the drainage system further includes a centrifugal pump connected to the suction pipe 110 of the suction pipe assembly.

[0071] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "leveling", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0072] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0073] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the leveling height of the first feature is higher than that of the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the leveling height of the first feature is less than that of the second feature.

[0074] 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 this application. 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. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0075] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0076] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A water suction pipe assembly, characterized in that, include: Pipelines; The driver is located outside the delivery pipe; The output shaft is connected to the driver; The drive shaft has one end located inside the conveying pipe and the other end passing through the conveying pipe, and is connected to the output shaft through a connecting sleeve; An impeller is disposed on the drive shaft and inside the conveying pipe; The connecting sleeve has a first involute spline on its inner wall, the output shaft has a second involute spline on its circumferential surface, and the transmission shaft has a third involute spline on its circumferential surface. Both the second and third involute splines mesh with the first involute spline.

2. The water suction pipe assembly according to claim 1, characterized in that, The output shaft has an output section and a first connecting section, and the transmission shaft includes a transmission section and a second connecting section; One end of the output section is connected to the driver, and the other end is connected to the first connection section; One end of the transmission part is disposed inside the conveying pipe, and the other end passes through the conveying pipe and is connected to the second connecting part; The first connecting portion and the second connecting portion are at least partially disposed within the connecting sleeve. The peripheral surface of the first connecting portion has a second involute spline, and the peripheral surface of the second connecting portion has a third involute spline.

3. The water suction pipe assembly according to claim 2, characterized in that, The water suction pipe assembly also includes: A first limiting member is provided on the output shaft; The second limiting member is provided on the drive shaft and located outside the conveying pipe; The connecting sleeve is located between the first limiting member and the second limiting member, and the distance between the first limiting member and the second limiting member matches the length of the connecting sleeve.

4. The water suction pipe assembly according to claim 2, characterized in that, The inner diameter of the connecting sleeve matches the diameter of the first connecting part and the diameter of the second connecting part.

5. The water suction pipe assembly according to any one of claims 1-4, characterized in that, The delivery pipe has a through hole, and the water suction pipe assembly further includes: A sealing sleeve is connected to the conveying pipe and is disposed within the through hole; The drive shaft passes through the sealing sleeve.

6. The water suction pipe assembly according to any one of claims 1-4, characterized in that, The water suction pipe assembly also includes: The bearing housing is located inside the conveying pipeline; A thrust bearing is disposed within the bearing housing and connected to the drive shaft; The impeller is located between the bearing housing and the output shaft.

7. The water suction pipe assembly according to any one of claims 1-4, characterized in that, The water suction pipe assembly also includes: Support base, connected to the drive and the delivery pipe; The transmission shaft portion, the output shaft, and the connecting sleeve are fitted inside the support base.

8. The water suction pipe assembly according to any one of claims 1-4, characterized in that, The water suction pipe assembly also includes: The suction pipe is connected to the delivery pipe; Branch pipe, connected to the conveying pipeline; The branch pipe is located between the suction pipe and the impeller.

9. The water suction pipe assembly according to claim 8, characterized in that, The branch pipe is equipped with a one-way valve.

10. A drainage system, characterized in that, It includes a centrifugal pump and a suction pipe assembly as described in any one of claims 1-9, wherein the centrifugal pump is connected to the delivery pipe.

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