A seawater pump

Abstract

This application provides a seawater pump, relating to the field of pump technology, comprising: a pump casing having an inlet, a plenum chamber, and an outlet sequentially connected, the inlet being perpendicular to the pump casing and detachably connected to an inlet elbow; a drive shaft, one end extending into the plenum chamber and the other end rotatably passing through a bearing housing for connection to a drive motor; a main impeller mounted on the drive shaft and near the inlet; and an auxiliary impeller mounted on the drive shaft and located between the main impeller and the pump casing; the blades on the main impeller are made of copper, and the blades on the auxiliary impeller are made of rubber; the main impeller has multiple main impeller screw holes; and a filter is connected to the inlet. The main impeller screw holes facilitate dynamic balancing, reduce pressure impact on the main impeller, and serve as process holes during assembly and disassembly. The filter connected to the inlet prevents large soft marine organisms from entering the plenum chamber and affecting the normal operation of the main and auxiliary impellers.

Description

Technical Field

[0001] This invention relates to the field of water pump technology, and in particular to a seawater pump. Background Technology

[0002] During ship operation, the cooling effect of the diesel engine directly affects its reliability and lifespan. The ship's cooling system is mainly used to dissipate the heat generated by the diesel engine, ensuring its normal operation. The seawater pump is the core component of the cooling system. The seawater pump introduces seawater from outside the ship into the heat exchanger, where the seawater cools the diesel engine's circulating water, thus achieving the purpose of cooling the diesel engine.

[0003] Traditional seawater pumps suffer from easily broken impeller blades, leading to frequent downtime for impeller replacements. This application aims to solve the blade breakage problem, extend pump lifespan, completely eliminate this pain point for users, and significantly reduce or even eliminate the hassle of constant after-sales service for OEMs. Summary of the Invention

[0004] In response to the above situation, the present invention provides a seawater pump, which aims to solve the problem of easy blade breakage of existing impellers, improve the service life of the pump, completely eliminate the user's pain points, and greatly reduce or even eliminate the technical problems of constant after-sales handling for the main engine manufacturer.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a seawater pump, comprising:

[0007] The pump casing has a water inlet, a pressure chamber and an outlet connected in sequence. The water inlet is perpendicular to the pump casing and is detachably connected to an inlet elbow.

[0008] The drive shaft has one end that rotates through the pump casing and extends into the pressure chamber, while the other end rotates through the bearing housing and is used to connect to the drive motor.

[0009] The main impeller is located in the pressure chamber and is mounted on the drive shaft near the water inlet.

[0010] The auxiliary impeller is located in the pressure chamber and is installed on the drive shaft between the main impeller and the pump casing;

[0011] in:

[0012] The blades on the main impeller are made of copper, while the blades on the secondary impeller are made of rubber.

[0013] The main impeller has multiple main blade screw holes arranged in a circumferential array. The main blade screw holes penetrate the main impeller, and the axis of the main blade screw holes is parallel to the axis of the drive shaft.

[0014] A filter is connected to the water inlet.

[0015] In some embodiments of the present invention, the pump casing, inlet bend, and main impeller are formed using wet phenolic resin coated sand molding.

[0016] In some embodiments of the present invention, the filter includes:

[0017] The outer cylinder is connected to the water inlet;

[0018] The inner column is located inside the outer cylinder, and the two are coaxially arranged.

[0019] The first diversion channel is formed by leaving a gap between the inner wall of the outer cylinder and the outer wall of the inner column;

[0020] The second diversion channel, multiple second diversion channels are inclinedly arranged in the inner column. One end of the second diversion channel is connected to the end of the inner column away from the water inlet, and the other end extends to the outer wall of the inner column and is connected to the first diversion channel.

[0021] The inner column can rotate around its own axis; the angle between the water outlet direction of the second diversion channel and the first diversion channel is an acute angle.

[0022] In some embodiments of the present invention, one end of the drive shaft extends into the outer cylinder and is connected to the end of the inner column.

[0023] In some embodiments of the present invention, the filter further includes:

[0024] The support plate is connected at one end to the outer wall of the outer cylinder and at the other end near the end of the inner column;

[0025] The connecting shaft is connected to the inner column at one end and rotatedly connected to the support plate via a second bearing at the other end.

[0026] In some embodiments of the present invention, the filter further includes:

[0027] The rotor is mounted on the connecting shaft;

[0028] The stator, located on the outer wall of the outer cylinder, is used to rotate the rotor.

[0029] In some embodiments of the present invention, a groove is provided at one end of the inner column away from the water inlet, and the diameter of the groove gradually decreases along the water inlet direction of the groove; the water inlet end of the second diversion channel is connected to the groove, and the diameter of the water outlet end of the second diversion channel gradually increases.

[0030] In some embodiments of the present invention, multiple cutting lines are arranged in the groove.

[0031] In some embodiments of the present invention, a spiral structure is provided in the first diversion channel, and the spiral structure is located on the outer wall of the inner column.

[0032] In some embodiments of the present invention, the inner wall of the outer cylinder also has a spiral structure.

[0033] The embodiments of the present invention have at least the following advantages or beneficial effects:

[0034] In summary, this embodiment has at least the following beneficial effects:

[0035] 1. The material of the blades on the main impeller was improved by changing to copper, which improved the blades' susceptibility to breakage and extended the service life of the main impeller.

[0036] 2. The main impeller has multiple main blade screw holes arranged in a circumferential array. This allows for dynamic balancing experiments by threading studs of a certain weight into these screw holes to achieve dynamic balance. The screw holes penetrate the main impeller, and their axes are parallel to the drive shaft axis. This allows a small portion of seawater to pass through the main impeller, reducing the pressure impact on the impeller and making the blades less prone to breakage. Furthermore, the screw holes can also be used as process holes during assembly and disassembly (aiding in the assembly and disassembly of the main impeller).

[0037] 3. In general, the inlet bend and the pump casing are designed as a single unit. However, in this embodiment, the inlet bend and the pump casing are separated into two parts. This helps to reduce the difficulty of the pump body from model preparation, casting and machining, improves the conformity of its flow part profile with the design, and also improves the smoothness of the flow part.

[0038] 4. The inlet is connected to a filter to prevent large soft marine organisms from entering the ballast chamber and affecting the normal operation of the main impeller and auxiliary impeller.

[0039] Other features and advantages of the present invention will be set forth in the following description. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 A schematic diagram of the seawater pump provided in Example 1;

[0042] Figure 2 This is a schematic diagram of the seawater pump provided in Example 2. Figure 2 The middle arrow indicates the direction of seawater flow;

[0043] Figure 3 for Figure 2Schematic diagram of the structure at the left end of the inner column;

[0044] Figure 4 for Figure 2 A magnified view of a portion of position A in the middle;

[0045] Figure 5 This is a schematic diagram of the seawater pump provided in Example 3.

[0046] icon:

[0047] 1-Pump casing, 11-Inlet, 12-Pressure chamber, 13-Outlet, 2-Drive shaft, 3-Main impeller, 4-Auxiliary impeller, 5-Bearing housing, 51-First bearing,

[0048] 6-Filter, 61-Outer cylinder, 62-Inner column, 621-Groove, 622-Cutting line, 63-First diversion channel, 631-Spiral structure, 64-Second diversion channel, 65-Support plate, 66-Connecting shaft, 67-Snap ring, 68-Seal, 69-Rotor, 71-Stator, 72-Second bearing. Detailed Implementation

[0049] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention.

[0050] In the description of the embodiments of the present invention, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present invention 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 on the embodiments of the present invention.

[0051] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] In the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0053] The embodiments of the present invention will be described in detail below.

[0054] Example 1

[0055] See Figure 1 This embodiment provides a seawater pump, including a pump casing 1, a drive shaft 2, a main impeller 3, and an auxiliary impeller 4.

[0056] The pump casing 1 has an inlet 11, a pressure chamber 12 and an outlet 13 connected in sequence. The inlet 11 is perpendicular to the pump casing 1 and is connected to an inlet elbow (not shown in the figure, but in a curved shape) via a flange.

[0057] One end of the drive shaft 2 rotates and seals through the pump casing 1 and extends into the pressure chamber 12; the other end rotates and passes through the bearing body 5 and is used to connect to the drive motor. The bearing body 5 contains a first bearing 51 for connecting to the drive shaft 2.

[0058] The main impeller 3 is located inside the pressure chamber 12 and is mounted on the drive shaft 2 near the inlet 11. Multiple main blade screw holes (not shown in the figure) are arranged in a circumferential array on the main impeller 3, penetrating the main impeller 3. The axis of the main blade screw holes is parallel to the axis of the drive shaft 2. The blades on the main impeller 3 are made of copper.

[0059] The auxiliary impeller 4 is located inside the pressure chamber 12, and is mounted on the drive shaft 2 between the main impeller 3 and the pump casing 1. The blades on the auxiliary impeller 4 are made of rubber.

[0060] The aforementioned pump casing 1, inlet bend, main impeller 3 and other flow-through components are made using wet phenolic resin coated sand molding.

[0061] Driven by the drive motor, the drive shaft 2 rotates, and the main impeller 3 and the auxiliary impeller 4 rotate at high speed, causing seawater to pass through the inlet bend, inlet 11, pressure chamber 12 and outlet 13 in sequence, thus entering the heat exchanger, where seawater is used to cool the diesel engine circulating water.

[0062] In summary, this embodiment has at least the following beneficial effects:

[0063] 1. The pump casing, inlet bend, main impeller, and other flow-through components are made using wet phenolic resin coated sand molding. This not only ensures the appearance and dimensional accuracy of the flow channels, but also increases the surface smoothness of the flow channels, reduces fluid friction loss, and improves hydraulic efficiency.

[0064] Second, in general, the inlet bend and the pump casing 1 are designed as a single unit. However, in this embodiment, the inlet bend and the pump casing 1 are separated into two parts. This helps to reduce the difficulty of the pump body from model preparation, casting and machining, improve the conformity of its flow part profile with the design, and also improve the smoothness of the flow part.

[0065] Third, the material of the blades on the main impeller 3 was improved to copper (originally plastic), which improved the blades' susceptibility to breakage and extended the service life of the main impeller 3.

[0066] IV. Multiple main blade screw holes are arranged in a circumferential array on the main impeller 3. This allows for dynamic balancing experiments by threading studs of a certain weight into these screw holes to achieve dynamic balance. The screw holes penetrate the main impeller 3, and their axes are parallel to the axis of the drive shaft 2. This allows a small portion of seawater to pass through the main impeller 3, reducing the pressure impact on the impeller 3 and preventing blade breakage. Furthermore, the screw holes can also be used as process holes during assembly and disassembly (aiding in the assembly and disassembly of the main impeller 3, etc.).

[0067] Example 2

[0068] This embodiment is an improvement on embodiment 1.

[0069] See Figures 1-4 The inlet 11 is connected to a filter 6 to prevent large soft marine organisms from entering the plenum chamber 12 and affecting the normal operation of the main impeller 3 and the auxiliary impeller 4 (for example, a complete jellyfish enveloping the main impeller 3 would cause unbalanced vibration).

[0070] The filter 6 includes an outer cylinder 61, an inner column 62, a first diversion channel 63, and a second diversion channel 64.

[0071] The outer cylinder 61 is directly connected to the water inlet 11 (e.g.) Figure 2 (as shown), or, connected to the inlet 11 via an inlet bend (the inlet bend is located between the outer cylinder 61 and the inlet 11).

[0072] The inner column 62 is located in the outer cylinder 61, and the two are coaxially arranged. The inner column 62 can rotate around its own axis.

[0073] A gap is left between the inner wall of the outer cylinder 61 and the outer wall of the inner column 62 to form the first diversion channel 63.

[0074] Multiple second diversion channels 64 are inclinedly arranged in the inner column 62. One end of the second diversion channel 64 is connected to the end of the inner column 62 away from the inlet 11, and the other end extends to the outer wall of the inner column 62 and is connected to the first diversion channel 63. The angle between the outlet direction of the second diversion channel 64 and the first diversion channel 63 is an acute angle (e.g., 30~60°).

[0075] The inner column 62 can rotate about its own axis in the following way: the filter 6 also includes a support plate 65, a connecting shaft 66, a snap ring 67, a seal 68, a rotor 69 and a stator 71.

[0076] One end of the support plate 65 is connected to the outer wall of the outer cylinder 61, and the other end is set near the end of the inner column 62.

[0077] One end of the connecting shaft 66 is connected to the inner column 62, and the other end is rotatably connected to the support plate 65 through the second bearing 72.

[0078] The retaining ring 67 is mounted on the connecting shaft 66, and the support plate 65 is located between the retaining ring 67 and the inner post 62. The retaining ring 67 serves to limit and prevent detachment.

[0079] The seal 68 is used to seal the gap between the support plate 65 and the connecting shaft 66, so as to seal the second bearing 72 between the connecting shaft 66 and the support plate 65.

[0080] Rotor 69 is mounted on connecting shaft 66.

[0081] The stator 71 is mounted on the outer wall of the outer cylinder 61 and is used to rotate the rotor 69.

[0082] The inner column 62 can rotate around its own axis within the outer cylinder 61 through the arrangement of the support plate 65, connecting shaft 66, second bearing 72, and seal 68. The rotor 69 and stator 71 constitute a motor drive structure. When the stator 71 is energized, the rotor 69 drives the connecting shaft 66 and inner column 62 to rotate at high speed via the stator 71. The heat generated when the stator 71 is energized is carried away by the flowing seawater in the outer cylinder 61.

[0083] Seawater is drawn into the outer cylinder 61 of the filter 6 by the action of the main impeller 3 and the auxiliary impeller 4, and flows along... Figure 2 The dashed line indicates a flow diversion path. A portion of the seawater directly enters the first diversion channel 63, while the other portion flows through the second diversion channel 64 and then returns to the inlet 11 of the pump casing 1 along with the seawater in the first diversion channel 63. During this process, causing the inner column 62 to rotate at high speed around its own axis achieves at least the following effects:

[0084] First, the flow areas (cross-sectional areas) of the first diversion channel 63 and the second diversion channel 64 are both small and narrow. After entering the narrow channels, the seawater, under the constraint of the law of conservation of mass, will inevitably increase its velocity to maintain a constant flow rate. Thus, the diversion process promotes and accelerates the flow of seawater. When the seawater converges in the first diversion channel 63 and the second diversion channel 64, large soft-bodied marine organisms collide and break up at high speed, forming small suspended solids. This is similar to the function of traditional filtration equipment (such as filter screens), effectively intercepting and preventing large soft-bodied marine organisms from entering the inlet 11, while allowing small suspended solids to enter the inlet 11. This does not affect the normal operation of the main impeller 3 and the auxiliary impeller 4, and avoids the frequent clogging issues common in traditional filtration equipment. After the seawater converges in the first diversion channel 63 and the second diversion channel 64, its kinetic energy is not completely lost, allowing it to continue flowing rapidly.

[0085] Second, when the inner column 62 rotates at high speed around its own axis, the seawater in the second diversion channel 64 will be accelerated out / sprayed out, which will promote the flow of seawater better.

[0086] Third, after the seawater in the second diversion channel 64 is ejected from the inner column 62, it will generate a reverse thrust on the inner column 62, which will offset part of the axial force on the inner column 62 and the connecting shaft 66 (the axial force applied to the inner column 62 by the seawater flowing in the outer cylinder 61). In this way, the axial force on the second bearing 72 can be reduced, and the life of the second bearing 72 will be longer.

[0087] A spiral structure 631 is provided in the first diversion channel 63, and the spiral structure 631 is located on the outer wall of the inner column 62 and the inner wall of the outer cylinder 61. The spiral structure 631 can provide a certain propulsion effect for seawater and also have a certain breaking effect on soft marine organisms.

[0088] The inner column 62 has a groove 621 at the end opposite to the inlet 11, and the diameter of the groove 621 gradually decreases along the water inlet direction. The inlet end of the second diversion channel 64 is connected to the groove 621, and the diameter of the outlet end of the second diversion channel 64 gradually increases. The above scheme is based on the Venturi principle (Venturi tube) and can further improve the flow-promoting effect on seawater.

[0089] Multiple cutting lines 622 are arranged inside the groove 621. This allows large soft marine organisms entering the groove 621 to be cut into smaller segments. The method of cutting first and then crushing by impact helps to improve the crushing effect. Marine soft organisms that are too large may cover the end of the groove 621 and the inner column 62 and cannot be directly cut by the cutting lines 622 before entering the second diversion channel 64. Under the action of the high-speed rotation of the inner column 62, the marine soft organisms that are too large will be thrown off and impact the inner wall of the outer cylinder 61, which will have a crushing effect.

[0090] It should be noted that the filter in this embodiment only passively treats large-volume soft marine organisms that have been sucked into the filter 6.

[0091] Example 3

[0092] See Figures 1-5 The difference between this embodiment and embodiment 2 is that the inner column 62 can rotate around its own axis in the following way:

[0093] One end of the drive shaft 2 extends into the outer cylinder 61 and connects to the end of the inner column 62. In this way, the drive shaft 2 can drive the main impeller 3 and the auxiliary impeller 4 to rotate at high speed, while simultaneously driving the inner column 62 to rotate at high speed, eliminating the need for an additional drive device to rotate the inner column 62 around its own axis. When the inner column 62 rotates at high speed, the seawater in the second diversion channel 64 is accelerated and ejected. After the seawater in the second diversion channel 64 is ejected from the inner column 62, it generates a reverse thrust on the inner column 62, offsetting part of the axial force on the drive shaft 2 (the axial force on the drive shaft 2 mainly comes from the pressure of the seawater flow on the main impeller 3 and the auxiliary impeller 4). Therefore, the axial runout and vibration of the drive shaft 2 are reduced, and the axial force on the first bearing 51 on the drive shaft 2 is reduced, resulting in a longer lifespan.

[0094] Finally, it should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Without conflict, the embodiments and features described in the embodiments of this application can be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A seawater pump, characterized in that, include: The pump casing has an inlet, a pressure chamber and an outlet connected in sequence. The inlet is perpendicular to the pump casing and is detachably connected to an inlet bend. The drive shaft has one end that rotates and seals through the pump casing and extends into the pressure chamber, and the other end that rotates and passes through the bearing body and is used to connect to the drive motor. The main impeller is located in the pressure chamber and is mounted on the drive shaft near the water inlet. A secondary impeller is located in the pressure chamber and is mounted on the drive shaft between the main impeller and the pump casing. in: The blades on the main impeller are made of copper, and the blades on the secondary impeller are made of rubber. The main impeller has multiple main blade screw holes arranged in a circumferential array, the main blade screw holes penetrate the main impeller, and the axis of the main blade screw holes is parallel to the axis of the drive shaft; The water inlet is connected to a filter; The pump casing, the inlet bend, and the main impeller are formed using wet phenolic resin coated sand molding. The filter includes: an outer cylinder connected to the water inlet; The inner column is located inside the outer cylinder, and the two are coaxially arranged. The first diversion channel is formed by leaving a gap between the inner wall of the outer cylinder and the outer wall of the inner column; The second diversion channel, a plurality of the second diversion channels are inclinedly arranged in the inner column, one end of the second diversion channel is connected to the end of the inner column away from the water inlet, and the other end extends to the outer wall of the inner column and is connected to the first diversion channel; The inner column is capable of rotating around its own axis; the angle between the water outlet direction of the second diversion channel and the first diversion channel is an acute angle.

2. The seawater pump according to claim 1, characterized in that, One end of the drive shaft extends into the outer cylinder and is connected to the end of the inner column.

3. The seawater pump according to claim 1, characterized in that, The filter also includes: A support plate is provided with one end connected to the outer wall of the outer cylinder and the other end near the end of the inner column; The connecting shaft is connected at one end to the inner column and at the other end to the support plate via a second bearing.

4. The seawater pump according to claim 3, characterized in that, The filter also includes: The rotor is mounted on the connecting shaft; The stator, mounted on the outer wall of the outer cylinder, is used to rotate the rotor.

5. The seawater pump according to claim 1, characterized in that, The inner column has a groove at one end away from the water inlet, and the diameter of the groove gradually decreases along the water inlet direction; the water inlet end of the second diversion channel is connected to the groove, and the diameter of the water outlet end of the second diversion channel gradually increases.

6. The seawater pump according to claim 5, characterized in that, Multiple cutting lines are arranged inside the groove.

7. The seawater pump according to any one of claims 1 to 6, characterized in that, The first diversion channel is provided with a spiral structure, which is located on the outer wall of the inner column.

8. The seawater pump according to claim 7, characterized in that, The inner wall of the outer cylinder also has a spiral structure.

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