Seawater pump

Abstract

A kind of seawater pump, the seawater pump includes pump shaft, impeller, guide shell, first guide bearing and first guide bearing support;Impeller is connected to pump shaft, guide shell is arranged in the side of impeller along the axial direction of pump shaft, and at least partially surrounds pump shaft, first guide bearing is sleeved on pump shaft, first guide bearing support includes the first support part extending along the axial direction of pump shaft and the second support part extending along the radial direction of pump shaft, the first end of the radial extension of second support part along pump shaft is connected first guide bearing, second end is connected first support part, the two ends of the axial extension of first support part along pump shaft are respectively connected guide shell, wherein, in the radial direction of pump shaft, the minimum inner diameter of guide shell is greater than the maximum outer diameter of impeller.The seawater pump is a self-skinned seawater pump, can guarantee that the rotor component including pump shaft and impeller can be extracted alone in the case where guide shell and other components are fixed, to reduce the lifting weight and maintenance time when overhauling, save cost.

Description

Technical Field

[0001] Embodiments of this disclosure relate to a seawater pump. Background Technology

[0002] The seawater pump in the vaporization system of an LNG (Liquefied Natural Gas) receiving terminal is a high-flow, low-head pump, typically with a flow rate of 8,500 to tens of thousands of cubic meters per hour and a head of 30-50 meters. As part of the vaporization system, the function of this seawater pump is to provide heat to the LNG, causing the -169°C liquid LNG to absorb heat and turn into a gaseous state. Summary of the Invention

[0003] At least one embodiment of this disclosure provides a seawater pump, which includes a pump shaft, an impeller, a guide shell, a first guide bearing, and a first guide bearing bracket. The impeller is connected to the pump shaft. The guide shell is disposed on one side of the impeller along the axial direction of the pump shaft and at least partially surrounds the pump shaft. The first guide bearing is sleeved on the pump shaft. The first guide bearing bracket includes a first bracket portion extending axially along the pump shaft and a second bracket portion extending radially along the pump shaft. A first end of the second bracket portion extending radially along the pump shaft is connected to the first guide bearing, and a second end is connected to the first bracket portion. Both ends of the first bracket portion extending axially along the pump shaft are respectively connected to the guide shell. In the radial direction of the pump shaft, the minimum inner diameter of the guide shell is greater than the maximum outer diameter of the impeller.

[0004] For example, in a seawater pump provided in at least one embodiment of this disclosure, the guide shell surrounds the first guide bearing.

[0005] For example, in a seawater pump provided in at least one embodiment of this disclosure, the two ends of the first bracket portion extending axially along the pump shaft include a third end close to the impeller and a fourth end away from the impeller, the third end also being connected to the impeller.

[0006] For example, in a seawater pump provided in at least one embodiment of this disclosure, the first support portion further includes a first connecting structure located at the third end. The first connecting structure includes an inner end face connected to the impeller and an outer end face connected to the guide shell. The inner end face is slidably connected to the impeller so that the impeller can rotate relative to the first support portion, and the outer end face overlaps with the guide shell.

[0007] For example, in a seawater pump provided in at least one embodiment of this disclosure, a support ring is provided on the inner end face, and an impeller ring is provided on the part of the impeller that is connected to the inner end face. The support ring and the impeller ring are configured to rotate relative to each other.

[0008] For example, at least one embodiment of the seawater pump provided in this disclosure further includes: a second guide bearing, sleeved on the pump shaft, disposed along the axial direction of the pump shaft on the side of the first guide bearing away from the impeller, including a first connecting end near the impeller and a second connecting end away from the impeller, wherein the first guide bearing bracket further includes a third bracket portion, the third bracket portion being disposed on the side of the first bracket portion away from the impeller, including a fifth end near the impeller and a sixth end away from the impeller, the fifth end being connected to the fourth end of the first bracket portion, and the sixth end being connected to the first connecting end of the second guide bearing.

[0009] For example, at least one embodiment of the seawater pump provided in this disclosure further includes: a first shaft guard tube disposed on the side of the second guide bearing away from the impeller, including a first tube end close to the impeller and a second tube end away from the impeller, wherein a second connecting end of the second guide bearing is connected to the first tube end.

[0010] For example, at least one embodiment of the seawater pump provided in this disclosure further includes a water delivery pipe and a third guide bearing. The water delivery pipe is disposed on the side of the guide shell away from the impeller and surrounds the pump shaft. The third guide bearing is sleeved on the pump shaft, surrounded by the water delivery pipe, and disposed on the side of the second guide bearing away from the impeller along the axial direction of the pump shaft. It includes a third connecting end near the impeller and a fourth connecting end away from the impeller. The third connecting end is connected to the second pipe end.

[0011] For example, at least one embodiment of the seawater pump provided in this disclosure further includes: a second retaining tube disposed on the side of the third guide bearing away from the impeller, including a third tube end near the impeller and a fourth tube end away from the impeller, the third tube end being connected to the fourth connecting end of the third guide bearing.

[0012] For example, at least one embodiment of the seawater pump provided in this disclosure further includes: a second guide bearing bracket extending in the radial direction of the pump shaft, including a seventh end near the third guide bearing and an eighth end near the water delivery pipe, wherein the seventh end is connected to the third guide bearing and the eighth end is slidably connected to the water delivery pipe.

[0013] For example, in a seawater pump provided in at least one embodiment of this disclosure, the water delivery pipe has a support platform protruding toward the second guide bearing bracket, and the eighth end of the second guide bearing bracket is configured to abut against the support platform. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.

[0015] Figure 1 This is a schematic diagram of the overall structure of a seawater pump provided in at least one embodiment of the present disclosure;

[0016] Figure 2 Figure 1 An enlarged schematic diagram of the seawater pump within the area of ​​the dashed circle A;

[0017] Figure 3 Figure 2 An enlarged schematic diagram of the seawater pump within the area of ​​the dashed circle A1;

[0018] Figure 4 Figure 2 An enlarged schematic diagram of the seawater pump within the area of ​​the dashed circle A2;

[0019] Figure 5 Figure 1 An enlarged schematic diagram of the seawater pump within the area of ​​the dashed circle B;

[0020] Figure 6 Figure 1 An enlarged schematic diagram of the seawater pump within the area of ​​the dashed circle C; and

[0021] Figure 7 Figure 1 An enlarged schematic diagram of the seawater pump within the area of ​​the dashed circle D; Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0023] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0024] Seawater pumps typically discharge water either above ground or below ground. For example, seawater pumps are vertical, wet-pit type; the impeller can be a mixed-flow type, and the casing is a diffuser bowl type; the pump shafts are connected by rigid couplings; each shaft is equipped with at least one guide bearing for auxiliary support and to reduce pump vibration; replaceable wear rings are fitted on the impeller and casing; the hydraulic axial thrust and rotor weight are borne by the pump end thrust sliding bearing; the shaft seal is an asbestos-free packing seal; the motor is mounted on an independent steel motor mount and connected to the pump via a flexible diaphragm coupling.

[0025] For example, in some implementations, the structure of a seawater pump, from bottom to top, can be a suction filter, a suction horn, a guide shell, and a delivery pipe. To save on material costs, components such as the delivery pipe, guide shell, impeller, and suction horn are typically extracted in sections. While this method of extracting components as a whole reduces costs, it makes on-site maintenance and overhauls difficult. If a malfunction occurs, the repair time and lifting weight will increase significantly, thus increasing operating and maintenance costs.

[0026] At least one embodiment of this disclosure provides a seawater pump, which includes a pump shaft, an impeller, a guide shell, a first guide bearing, and a first guide bearing bracket. The impeller is connected to the pump shaft. The guide shell is disposed on one side of the impeller along the axial direction of the pump shaft and at least partially surrounds the pump shaft. The first guide bearing is sleeved on the pump shaft. The first guide bearing bracket includes a first bracket portion extending axially along the pump shaft and a second bracket portion extending radially along the pump shaft. The first end of the second bracket portion extending radially along the pump shaft is connected to the first guide bearing, and the second end is connected to the first bracket portion. The two ends of the first bracket portion extending axially along the pump shaft are respectively connected to the guide shell. In the radial direction of the pump shaft, the minimum inner diameter of the guide shell is greater than the maximum outer diameter of the impeller.

[0027] The seawater pump provided in this embodiment is a core-extractable type. Through the above-described design of the impeller, guide shell, first guide bearing, and first guide bearing bracket, the pump shaft and impeller, as rotor components, can be extracted from the guide shell. This ensures that the entire rotor component can be extracted separately while the guide shell and other components remain fixed. This can greatly reduce the lifting weight and maintenance time during maintenance, save operating and maintenance costs, and make on-site maintenance more convenient.

[0028] The seawater pump provided in this disclosure will be described below through several specific embodiments.

[0029] This disclosure provides at least one embodiment of a seawater pump, Figure 1 This is a schematic diagram of the overall structure of the seawater pump. Figure 2 for Figure 1 An enlarged schematic diagram of the seawater pump within the area circled A. (See diagram below.) Figure 1 and Figure 2 As shown, the seawater pump includes components such as a pump shaft 101, an impeller 102, a guide shell 103, a first guide bearing 201, and a first guide bearing bracket 301.

[0030] The impeller 102 is connected to the pump shaft 101 so that it can be driven by the pump shaft 101 to rotate. A guide shell 103 is disposed on one side (shown as the upper side in the figure) of the impeller 102 along the axial direction (vertical direction in the figure) of the pump shaft 101, and at least partially surrounds the pump shaft 101. A first guide bearing 201 is sleeved on the pump shaft 101 and provides support for the pump shaft 101.

[0031] The first guide bearing bracket 301 includes a first bracket portion 301A extending axially (vertically in the figure) along the pump shaft 101 and a second bracket portion 301B extending radially (horizontally in the figure) along the pump shaft 101, as shown below. Figure 2 As shown, the first end of the second bracket portion extending radially along the pump shaft 101 (i.e., the end E1 near the first guide bearing 201) is connected to the first guide bearing 201, and the second end (i.e., the end E2 near the first bracket portion 301A) is connected to the first bracket portion 301A. The two ends E3 and E4 (the upper and lower ends in the figure) of the first bracket portion 301A extending axially along the pump shaft 101 are respectively connected to the guide housing 103, for example, abutting against the guide housing 103. Thus, the first guide bearing bracket 301 can support the first guide bearing 201 to fix the first guide bearing 201 in a predetermined position.

[0032] In the radial direction of the pump shaft 101, the minimum inner diameter of the guide shell 103 is greater than the maximum outer diameter of the impeller 102. As a result, the pump shaft 101, impeller 102, first guide bearing support 301, and guide bearing 201 as a whole can be extracted from the guide shell 103, for example, when the guide shell 103 and other components are stationary, thus realizing a core-extractable seawater pump.

[0033] For example, such as Figure 1 and Figure 2 As shown, the guide shell 103 surrounds the first guide bearing 201, meaning the first guide bearing 201 is disposed inside the guide shell 103. For example, at least a portion of the first guide bearing bracket 301 is also disposed inside the guide shell 103. For example, the connections between the two ends E3 and E4 of the first guide bearing bracket 301 and the guide shell 103 are both overlapping, meaning the two ends E3 and E4 of the first guide bearing bracket 301 abut against the guide shell 103 respectively, so that they form a sealed whole with the guide shell 103 when connected. When the first guide bearing bracket 301 is subjected to force, the first guide bearing bracket 301 can be separated from the guide shell 103, so that the pump shaft 101, impeller 102, first guide bearing bracket 301, and guide bearing 201 as a whole can be smoothly extracted.

[0034] For example, in some embodiments, such as Figure 2 As shown, the first support portion 301A extends axially along the pump shaft 101 at both ends, including a third end E2 near the impeller 102 and a fourth end E4 away from the impeller 102. The third end E3 is also connected to the impeller 102.

[0035] For example, such as Figure 2 As shown, the first support portion 301A also includes a first connecting structure 301B1 located at the third end E3, for example, Figure 3 It shows Figure 2 The enlarged schematic diagram within the dashed circle A1 shows the structure in which the third end E3 of the first support portion 301A is connected to the impeller 102 and the guide shell 103; Figure 4 It shows Figure 2 The enlarged schematic diagram within the dashed coil A2 shows the structure in which the fourth end E4 of the first support portion 301A is connected to the flow guide shell 103.

[0036] For example, such as Figure 2 and Figure 3As shown, in some embodiments, the first connecting structure 301B1 includes an inner end face 301B2 connected to the impeller 102 and an outer end face 301B3 connected to the guide shell 103. The inner end face 301B2 is slidably connected to the impeller 102 so that the impeller 102 can rotate relative to the first support portion 301A. The outer end face 301B3 overlaps with the guide shell 103, for example, abuts against the guide shell 103, and can be separated from the guide shell 103 when subjected to force, so as to facilitate the first guide bearing support 301 and the impeller 102 to be pulled out together.

[0037] For example, in an embodiment of this disclosure, in order to allow the impeller 102 to be smoothly extracted, the minimum inner diameter of the guide shell 103 is greater than the maximum outer diameter of the impeller 102 in the radial direction of the pump shaft 101. At this time, the structural gap between the guide shell 103 and the impeller 102 can be filled by the setting of the first connecting structure 301B1.

[0038] For example, such as Figure 2 and Figure 3 As shown, in some embodiments, the inner end face 301B2 of the first connecting structure 301B1 is provided with a support ring K1. For example, the inner end face 301B2 and the support ring K1 are press-fitted to ensure a tight connection. The part of the impeller 102 that connects with the inner end face 301B2 is provided with an impeller ring K2, and the impeller 102 and the impeller ring K2 are press-fitted to ensure a tight connection. For example, the gap between the support ring K1 and the impeller ring K2 is configured to allow relative rotation. Thus, when the pump shaft 101 drives the impeller 102 to rotate, the first guide bearing support 301 can remain stationary without rotating, ensuring the stability of the entire system.

[0039] For example, in some embodiments, such as Figure 1 and Figure 2 As shown, the seawater pump may also include a second guide bearing 202, which is sleeved on the pump shaft 101 and is disposed on the side of the first guide bearing 201 away from the impeller 102 along the axial direction of the pump shaft 101. The second guide bearing 202 includes a first connecting end T1 near the impeller 102 and a second connecting end T2 away from the impeller 102.

[0040] For example, such as Figure 2 As shown, the first guide bearing bracket 301 also includes a third bracket portion 301C. The third bracket portion 301C is disposed on the side of the first bracket portion 301A away from the impeller 102, including a fifth end E5 close to the impeller 102 and a sixth end E6 away from the impeller 102. The fifth end E5 is connected to the fourth end E4 of the first bracket portion 301A by means of a fixed connection such as welding, and the sixth end E6 is connected to the first connection end T1 of the second guide bearing 202 by means of a fixed connection such as bolting.

[0041] For example, such as Figure 2 As shown, the third support portion 301C is inclined relative to the pump shaft 101. The overall shape of the third support portion 301C is roughly conical. The sixth end E6 of the third support portion 301C is closer to the pump shaft 101 than the fifth end E5.

[0042] For example, such as Figure 4 As shown, in some embodiments, the fourth end of the first support portion 301A and the fifth end E5 of the third support portion 301C can be connected by a connecting portion 301D, for example, by welding, so that the first support portion 301A and the third support portion 301C form a whole. For example, the whole assembly after the fourth end of the first support portion 301A and the fifth end E5 of the third support portion 301C are welded to the connecting portion 301D abuts against the guide shell 103, and can be separated from the guide shell 103 when subjected to force, so that the first guide bearing support 301 and the impeller 102 can be extracted together.

[0043] For example, in some embodiments, such as Figure 1 and Figure 2 As shown, the seawater pump may further include a first shaft guard tube 401, which is disposed on the side of the second guide bearing 202 away from the impeller 102. The first shaft guard tube 401 includes a first tube end G1 near the impeller 102 and a second tube end G2 away from the impeller 102. The second connecting end T2 of the second guide bearing 202 is connected to the first tube end G1, for example, by bolting or other fixed connection. The first shaft guard tube 401 surrounds the pump shaft 101 and serves to protect the pump shaft 101 from corrosion by seawater or other sources.

[0044] For example, Figure 5 It shows Figure 1 An enlarged schematic diagram of the seawater pump within the area of ​​the dashed circle B. (See diagram below.) Figure 5 As shown, in some embodiments, the second guide bearing 202 may include components such as a bearing bracket 2021, a buffer sleeve 2022, a guide bearing portion 2023, and a support bushing 2024. The support bushing 2024 is tightly connected to the pump shaft 101 and can rotate with the pump shaft 101; the guide bearing portion 2023 is the main support component and can rotate relative to the support bushing 2024, and can be stationary when the pump shaft 101 rotates; the buffer sleeve 2022 is disposed between the guide bearing portion 2023 and the bearing bracket 2021, and plays a role in buffering and protection; the bearing bracket 2021 is used to connect with other structures, for example, by means of fixing elements, such as screws, and is connected to the first guide bearing bracket 301 and the first shaft protector tube 401 at the first connecting end T1 and the second connecting end T2, respectively.

[0045] For example, in embodiments of this disclosure, other guide bearings, such as the first guide bearing 201 and the third guide bearing 203 (described later), have a structure that is substantially the same as or similar to that of the second guide bearing 202. See details in [link to relevant documentation]. Figure 5 The relevant descriptions will not be repeated here.

[0046] For example, in some embodiments, such as Figure 1 As shown, the seawater pump may also include a water delivery pipe 104 and a third guide bearing 203. The water delivery pipe 104 is located on the side of the guide shell 103 away from the impeller 102 and surrounds the pump shaft 101. The third guide bearing 203 is sleeved on the pump shaft 101 and surrounded by the water delivery pipe 104. The third guide bearing 203 is located on the side of the second guide bearing 203 away from the impeller 102 along the axial direction of the pump shaft 101.

[0047] For example, Figure 6 It shows Figure 1 An enlarged schematic diagram of the Zhonghai seawater pump within the area circled C. (See diagram below.) Figure 6 As shown, in some embodiments, the third guide bearing 203 includes a third connecting end T3 near the impeller 102 and a fourth connecting end T4 away from the impeller 102. The third connecting end T3 is connected to the second tube end G2, for example, by a fixed connection such as a bolt connection.

[0048] For example, such as Figure 1 and Figure 6 As shown, the seawater pump may also include a second shaft guard tube 402, which is disposed on the side of the third guide bearing 203 away from the impeller 102. The second shaft guard tube 402 includes a third tube end G3 close to the impeller 102 and a fourth tube end G4 away from the impeller 102. The third tube end G3 is connected to the fourth connection end T4 of the third guide bearing 203, for example, by bolt connection or other fixed connection.

[0049] For example, such as Figure 1 and Figure 6As shown, in some embodiments, the seawater pump may further include a second guide bearing bracket 302, which extends radially along the pump shaft 101 and includes a seventh end E7 near the third guide bearing 203 and an eighth end E8 near the water delivery pipe 104. The seventh end E7 is connected to the third guide bearing 203, and the eighth end E8 is slidably connected to the water delivery pipe 104. Thus, the second guide bearing bracket 302 can support the third guide bearing 203 and the pump shaft 101, and facilitates the removal of the pump shaft 101 and impeller 102 as a whole. Through the sliding connection between the eighth end E8 and the water delivery pipe 104, the second guide bearing bracket 302 can be removed together with the first shaft guard tube 401 and the second shaft guard tube 402. In addition, the second guide bearing bracket 302 can also ensure the auxiliary support of the third guide bearing 203 for the pump shaft 101, reduce the vibration of the rotor components including the pump shaft 101, and improve the concentricity between different shaft parts of the pump shaft.

[0050] For example, such as Figure 6 As shown, in some embodiments, the water delivery pipe 104 has a support platform 104A protruding toward the second guide bearing bracket 302, and the eighth end E8 of the second guide bearing bracket 302 is configured to abut against the support platform 104A. Thus, when the second guide bearing bracket 302 is connected to the water delivery pipe 104, the eighth end E8 of the second guide bearing bracket 302 can fully abut against the support platform 104A for fixation. When the pump shaft 101 and impeller 102 are withdrawn as a whole, the second guide bearing bracket 302 is subjected to force, allowing it to separate from the support platform 104A and be extracted from the water delivery pipe 104.

[0051] For example, in some embodiments, such as Figure 1 As shown, the seawater pump may include a combination of multiple third guide bearings 203 and second guide bearing supports 302, such as... Figure 1 As shown by the elliptical dashed circle, the pump shaft 101 is supported at multiple locations on the water delivery pipe 104, and multiple shaft protection tubes are connected in sequence to protect the pump shaft 101. For example, when components such as the pump shaft 101 and impeller 102 are pulled out, the combination of multiple third guide bearings 203 and second guide bearing brackets 302 can also be pulled out together.

[0052] For example, Figure 7 It shows Figure 1 An enlarged schematic diagram of the seawater pump within the area circled D. (See diagram below.) Figure 7 As shown, in some embodiments, the seawater pump may further include a bushing 400, which is fitted onto the side of the pump shaft 101 away from the impeller 102, i.e., the lower side in the figure, to protect the pump shaft 101 at its end from corrosion by seawater or the like. For example, as Figure 7As shown, the bushing 400 can be fixedly connected to the pump shaft 101 and the impeller 102 by means of components such as the split retaining ring 102B, the positioning sleeve 102C, and screws.

[0053] For example, in embodiments of this disclosure, such as Figure 1 As shown, the seawater pump may also include components such as a suction horn 105 and a suction filter 106 located at the bottom. For example, the seawater pump may also include multiple couplings 501, and the pump shaft 101 may include multiple shaft portions, with adjacent shaft portions connected by couplings 501. For example, the seawater pump may also include components such as a pump outlet expansion joint 107 located in the middle and a wall-embedded short section 108, used to reduce the impact of the medium on the pump unit and pipeline, playing a role in vibration reduction and buffering. For example, the seawater pump may also include components such as a pump cover 109, a breather valve 110, a motor 111, a motor bracket 112, a spark-free elastic laminated coupling 113, a thrust sliding bearing 114, and a thrust bearing bracket 115 located at the top, to realize the connection of the motor and its corresponding functions. For example, the seawater pump may also include components such as anchor bolts 116, used for fixing to the ground. Other structures of the seawater pump disclosed herein will not be described in detail; please refer to related technologies for specific details.

[0054] For example, in embodiments of this disclosure, the pump shaft 101 can be made of metal or alloy materials, such as duplex steel forgings. The impeller 102 can be of various forms, such as a mixed-flow impeller, and can be made of metal or alloy materials, such as duplex steel castings. The guide shell 103 can be made of metal or alloy materials, such as duplex steel castings. The bearing supports 2021 of each guide bearing can be made of metal or alloy materials, such as duplex steel plates; the buffer sleeve 2022 can be made of elastic materials such as rubber; the guide bearing portion 2023 can be made of metal or alloy materials, such as stainless steel; the support bushing 2024 can be made of elastic materials such as rubber, and its surface in contact with the guide bearing portion 2023 can be made of wear-resistant materials such as metal powder. For example, each guide bearing support can be made of metal or alloy materials, such as duplex steel plates. The support ring on the first connecting structure of the first guide bearing support and the impeller ring on the impeller can be sealing rings of equivalent hardness or with a hardness difference greater than 50HB, such as metal sealing rings. For example, the support platform 104A on the water supply pipe 104 can be made of metal or alloy. The embodiments of this disclosure do not limit the materials or specific forms of the structures.

[0055] The seawater pump provided in this embodiment is a removable core type. Through the design of components such as the impeller, guide shell, first guide bearing bracket at the guide shell, second guide bearing bracket at the water delivery pipe, third guide bearing bracket, and shaft protector, the entire impeller, pump shaft, guide bearings, guide bearing brackets, and shaft protector can be extracted from the guide shell and water delivery pipe. This ensures that the rotor assembly, including the impeller and pump shaft, can be extracted individually while the water delivery pipe and guide shell remain stationary. This significantly reduces lifting weight and maintenance time during repairs, saves operating and maintenance costs, and makes on-site repairs more convenient. Furthermore, to ensure that the maximum outer diameter of the impeller is smaller than the minimum inner diameter of the guide shell, in... The lower end of the first guide bearing bracket is provided with a first connecting structure of a certain width, which connects the impeller and the guide shell to make up for the structural deficiency in this section. In addition, protective shaft tubes are installed between adjacent guide bearing brackets to protect the pump shaft, such as protecting the pump shaft from erosion and wear by seawater and silt, increasing the shaft's life and operational reliability, and reducing the possibility of silt entering the dynamic and static friction pairs, thereby further protecting components such as the inlet ring, shaft sleeve, and guide bearing. Furthermore, the guide bearing bracket and the water delivery pipe adopt a sliding fit instead of a welded structure, which can ensure that the protective shaft tube and the guide bearing bracket can be easily pulled out, thereby ensuring that the rotor components, including the impeller and pump shaft, can be easily pulled out.

[0056] The following points also need to be explained:

[0057] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure. Other structures can be referred to the general design.

[0058] (2) For clarity, the thickness of layers or regions in the drawings used to describe embodiments of the present disclosure is enlarged or reduced, i.e., these drawings are not drawn to actual scale.

[0059] (3) Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0060] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. The scope of protection of this disclosure shall be determined by the scope of the claims.

Claims

1. A seawater pump, comprising: Pump shaft, The impeller is connected to the pump shaft. A flow guide shell is disposed on one side of the impeller along the axial direction of the pump shaft, and at least partially surrounds the pump shaft. The first guide bearing is sleeved on the pump shaft. A first guide bearing bracket includes a first bracket portion extending axially along the pump shaft and a second bracket portion extending radially along the pump shaft. A first end of the second bracket portion extending radially along the pump shaft is connected to the first guide bearing, and a second end is connected to the first bracket portion. The two ends of the first bracket portion extending axially along the pump shaft are respectively connected to the flow guide housing. The second guide bearing, sleeved on the pump shaft, is disposed along the axial direction of the pump shaft on the side of the first guide bearing away from the impeller, and includes a first connecting end near the impeller and a second connecting end away from the impeller. In the radial direction of the pump shaft, the minimum inner diameter of the guide shell is greater than the maximum outer diameter of the impeller; The first support portion includes a third end extending axially along the pump shaft at both ends, one near the impeller and the other away from the impeller, the third end also being connected to the impeller. The first support portion further includes a first connecting structure located at the third end. The first connecting structure includes an inner end face connected to the impeller and an outer end face connected to the guide shell. The inner end face is slidably connected to the impeller so that the impeller can rotate relative to the first support portion. The outer end face overlaps with the guide shell. The first guide bearing bracket further includes a third bracket portion, which is disposed on the side of the first bracket portion away from the impeller and includes a fifth end close to the impeller and a sixth end away from the impeller. The fifth end is connected to the fourth end of the first bracket portion, and the sixth end is connected to the first connecting end of the second guide bearing.

2. The seawater pump according to claim 1, wherein, The flow guide shell surrounds the first guide bearing.

3. The seawater pump according to claim 1, wherein, A support ring is provided on the inner end face, and an impeller ring is provided at the part of the impeller that connects to the inner end face. The support ring and the impeller ring are configured to rotate relative to each other.

4. The seawater pump according to claim 1, further comprising: The first protective tube is disposed on the side of the second guide bearing away from the impeller, and includes a first tube end close to the impeller and a second tube end away from the impeller. The second connecting end of the second guide bearing is connected to the first tube end.

5. The seawater pump according to claim 4, further comprising: A water delivery pipe is disposed on the side of the guide shell away from the impeller and surrounds the pump shaft. The third guide bearing, sleeved on the pump shaft and surrounded by the water delivery pipe, is disposed along the axial direction of the pump shaft on the side of the second guide bearing away from the impeller, and includes a third connecting end near the impeller and a fourth connecting end away from the impeller. The third connection end is connected to the second tube end.

6. The seawater pump according to claim 5, further comprising: The second protective tube is disposed on the side of the third guide bearing away from the impeller, and includes a third tube end close to the impeller and a fourth tube end away from the impeller. The third tube end is connected to the fourth connecting end of the third guide bearing.

7. The seawater pump according to claim 6, further comprising: The second guide bearing bracket extends radially along the pump shaft and includes a seventh end near the third guide bearing and an eighth end near the water delivery pipe. The seventh end is connected to the third guide bearing, and the eighth end is slidably connected to the water supply pipe.

8. The seawater pump according to claim 7, wherein, The water delivery pipe has a support platform protruding toward the second guide bearing bracket, and the eighth end of the second guide bearing bracket is configured to abut against the support platform.

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