Sea water pump

Abstract

The invention provides a sea water pump, and relates to the technical field of water pumps, the sea water pump comprises a pump shell, the pump shell is provided with a water inlet, a pumping chamber and a water outlet which are communicated in sequence, and the water inlet is perpendicular to the pump shell and detachably connected with a water inlet elbow; one end of the transmission shaft extends into the pumping chamber, and the other end rotationally penetrates through the bearing body to be connected with a driving motor; the main impeller is mounted on the transmission shaft and close to the water inlet; the auxiliary impeller is installed on the transmission shaft and located between the main impeller and the pump shell. The blades on the main impeller are made of copper, and the blades on the auxiliary impeller are made of rubber. A plurality of main impeller screw holes are distributed in the main impeller; the water inlet is connected with a filter. Due to the arrangement of the main blade screw holes, dynamic balance is conveniently achieved, pressure impact on the main impeller is reduced, and the main blade screw holes are used as auxiliary holes during assembly and disassembly. And the water inlet is connected with a filter, so that the normal work of the main impeller and the auxiliary impeller is prevented from being influenced due to the fact that large-volume soft marine organisms enter the pumping chamber.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water pumps, in particular to a seawater pump. BACKGROUND

[0002] During the operation of a ship, the cooling effect of a diesel engine directly affects the reliability and service life of the engine. The cooling system of the ship is mainly used to dissipate the heat generated by the diesel engine, so as to ensure the normal operation of the diesel engine. The seawater pump is a core component of the cooling system. The seawater pump is used to introduce seawater from the outside of the ship into a heat exchanger, and the seawater is used to cool the diesel engine circulating water in the heat exchanger to achieve heat exchange, thereby achieving the purpose of cooling the diesel engine.

[0003] The impeller blades of the traditional seawater pump are prone to breakage, which causes the user to frequently stop and replace the impeller. The present application aims to solve the problem of blade breakage, improve the service life of the pump, completely eliminate the user's immediate pain points, and greatly reduce or even eliminate the annoyance of the main engine factory's continuous after-sales processing. SUMMARY

[0004] In view of the above problems, the present application provides a seawater pump, which aims to solve the problem of blade breakage of the existing impeller, improve the service life of the pump, completely eliminate the user's immediate pain points, and greatly reduce or even eliminate the annoyance of the main engine factory's continuous after-sales processing.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: The present application provides a seawater pump, comprising: A pump shell having a water inlet, a water compression chamber and a water outlet connected in sequence, the water inlet being perpendicular to the pump shell and detachably connected with a water inlet elbow pipe; A transmission shaft, one end of which is rotatably sealed and penetrates the pump shell to extend into the water compression chamber, and the other end of which is rotatably penetrated through a bearing body to be connected with a driving motor; A main impeller located in the water compression chamber, the main impeller being installed on the transmission shaft and close to the water inlet; A secondary impeller located in the water compression chamber, the secondary impeller being installed on the transmission shaft and located between the main impeller and the pump shell; Wherein: The material of the blades on the main impeller is copper, and the material of the blades on the secondary impeller is rubber; A plurality of main impeller screw holes are arranged in a circumferential array on the main impeller, the main impeller screw holes penetrating the main impeller, and the axis of the main impeller screw holes being parallel to the axis of the transmission shaft; The water inlet is connected with a filter.

[0006] In some embodiments of the present application, the pump shell, the water inlet elbow pipe and the main impeller are made of wet phenolic resin film sand molding.

[0007] In some embodiments of the present application, the filter comprises: The outer cylinder is connected with the water inlet; The inner column is located in the outer cylinder and coaxially arranged with the outer cylinder. The first shunt channel is formed by the gap between the inner wall of the outer cylinder and the outer wall of the inner column. The second shunt channel is obliquely arranged in the inner column, and one end of the second shunt channel is communicated with the end of the inner column away from the water inlet, and the other end of the second shunt channel is extended to the outer side wall of the inner column and communicated with the first shunt channel. The inner column can rotate around its axis, and the included angle between the water outlet direction of the second shunt channel and the first shunt channel is an acute angle.

[0008] In some embodiments of the present application, one end of the transmission shaft is extended into the outer cylinder and connected with the end of the inner column.

[0009] In some embodiments of the present application, the filter further comprises: The support plate is connected at one end to the outer wall of the outer cylinder and arranged near the end of the inner column at the other end. The connecting shaft is connected at one end with the inner column and rotatably connected at the other end with the support plate through the second bearing.

[0010] In some embodiments of the present application, the filter further comprises: The rotor is installed on the connecting shaft. The stator is arranged on the outer wall of the outer cylinder and used to rotate the rotor.

[0011] In some embodiments of the present application, a groove is formed in the 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 shunt channel is communicated with the groove, and the diameter of the water outlet end of the second shunt channel gradually increases.

[0012] In some embodiments of the present application, a plurality of cutting lines are arranged in the groove.

[0013] In some embodiments of the present application, a spiral structure is arranged in the first shunt channel, and the spiral structure is located on the outer wall of the inner column.

[0014] In some embodiments of the present application, the inner wall of the outer cylinder also has a spiral structure.

[0015] The embodiments of the present application have at least the following advantages or beneficial effects: In combination with the above, the embodiments have at least the following beneficial effects: 1. The material of the blades on the main impeller is improved to copper, which improves the situation that the blades are easily broken and prolongs the service life of the main impeller.

[0016] 2. The main impeller has multiple main impeller screw holes arranged in a circular array. This allows for dynamic balancing during dynamic balancing tests by threading heavy studs into these holes. The main impeller screw holes extend through the impeller, with their axes parallel to the drive shaft. This allows a small amount of seawater to pass through the impeller, reducing the pressure shock to the impeller and preventing blade breakage. Furthermore, the main impeller screw holes serve as process holes during assembly and disassembly (assisting with assembly and disassembly of the main impeller).

[0017] 3. Generally, the water inlet elbow and the pump casing are designed as an integrated whole, but in this embodiment, the water inlet elbow and the pump casing are separated into two parts. This helps to reduce the difficulty of model preparation, casting, and machining of the pump body, improves the consistency of the profile of the flow-through part with the design, and also improves the smoothness of the flow-through part.

[0018] 4. A filter is connected to the water inlet to prevent large soft marine organisms from entering the pressure chamber and affecting the normal operation of the main impeller and auxiliary impeller.

[0019] Other features and advantages of the present invention will be set forth in the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic structural diagram of the seawater pump provided in Example 1; Figure 2 This is a schematic diagram of the structure of the seawater pump provided in Example 2. Figure 2 The middle arrow indicates the direction of seawater flow; Figure 3 for Figure 2 Schematic diagram of the structure at the left end of the middle inner column; Figure 4 for Figure 2 A partial enlarged view of position A in the middle; Figure 5 This is a schematic structural diagram of the seawater pump provided in Example 3.

[0022] icon: 1- pump casing, 11- water inlet, 12- water pressure chamber, 13- water outlet, 2- transmission shaft, 3- main impeller, 4- auxiliary impeller, 5- bearing body, 51- first bearing, 6-filter, 61-outer cylinder, 62-inner column, 621-groove, 622-cutting line, 63-first shunt passage, 631-helical structure, 64-second shunt passage, 65-branch plate, 66-connecting shaft, 67-clamp spring, 68-seal, 69-rotor, 71-stator, 72-second bearing. DETAILED DESCRIPTION

[0023] Hereinafter, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present application.

[0024] In the description of the embodiments of the present application, it needs to be understood that the terms "inner", "outer" and the like indicate the positional or location relationship based on the positional or location relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0025] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0026] In the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or can be integrated; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0027] The embodiments of the present application will be described in detail below.

[0028] Embodiment 1

[0029] Reference Figure 1 The present embodiment provides a seawater pump, comprising a pump shell 1, a transmission shaft 2, a main impeller 3 and a secondary impeller 4.

[0030] The pump shell 1 has a water inlet 11, a water compression chamber 12 and a water outlet 13 connected in sequence, the water inlet 11 is perpendicular to the pump shell 1 and is detachably connected with a water inlet elbow (not shown in the figure, in a curved shape) through a flange.

[0031] One end of the transmission shaft 2 is rotatably sealed through the pump shell 1 and extends into the water chamber 12, and the other end is rotatably sealed through the bearing body 5 and is used for connection with the driving motor. The bearing body 5 has a first bearing 51 for connection with the transmission shaft 2.

[0032] The main impeller 3 is located in the water chamber 12, and the main impeller 3 is installed on the transmission shaft 2 and close to the water inlet 11. A plurality of main impeller holes (not shown in the figure) are arranged in a circular array on the main impeller 3, the main impeller holes pass through the main impeller 3, and the axis of the main impeller holes is parallel to the axis of the transmission shaft 2. The material of the blades on the main impeller 3 is copper.

[0033] The auxiliary impeller 4 is located in the water chamber 12, and the auxiliary impeller 4 is installed on the transmission shaft 2 and located between the main impeller 3 and the pump shell 1. The material of the blades on the auxiliary impeller 4 is rubber.

[0034] The pump shell 1, the water inlet elbow, the main impeller 3 and other flow components are made of wet phenolic resin film sand molding.

[0035] The transmission shaft 2 is driven to rotate by the driving motor, and the main impeller 3 and the auxiliary impeller 4 are driven to rotate at high speed by the transmission shaft 2, so that the seawater sequentially passes through the water inlet elbow, the water inlet 11, the water chamber 12 and the water outlet 13, and then enters the heat exchanger, and the seawater is used to cool the diesel engine circulating water in the heat exchanger.

[0036] In combination with the above, the embodiment has at least the following beneficial effects: I. The pump shell 1, the water inlet elbow, the main impeller 3 and other flow components are made of wet phenolic resin film sand molding. Not only the dimensional accuracy of the appearance and flow channel can be ensured, but also the surface finish of the flow channel can be increased, the friction loss of the fluid can be reduced, and the hydraulic efficiency can be improved.

[0037] II. The water inlet elbow and the pump shell 1 are designed as one piece, and the water inlet elbow and the pump shell 1 are split into two parts in the embodiment. In this way, the difficulty of the pump body from the model preparation, casting and machining can be reduced, the over-flowing part line and the design consistency can be improved, and the over-flowing part finish can be improved.

[0038] III. The material of the blades on the main impeller 3 is improved to copper (originally plastic material), which improves the easy breaking of the blades and prolongs the service life of the main impeller 3.

[0039] Four, the main impeller 3 is provided with a plurality of main blade screw holes in a circumferential array, so that when doing dynamic balance experiment, a certain weight of stud can be screwed in the main blade screw hole to make the main impeller 3 achieve dynamic balance. The main blade screw hole penetrates the main impeller 3, and the axis of the main blade screw hole is parallel to the axis of the transmission shaft 2, so that a small amount of seawater can pass through the main impeller 3, and the pressure impact on the main impeller 3 is reduced by shunting seawater, and the blades of the main impeller 3 are not easy to break. In addition, the main blade screw hole can also be used as a process hole during assembly and disassembly (auxiliary assembly and disassembly of the main impeller 3 and the like).

[0040] Embodiment 2

[0041] This embodiment is improved on the basis of embodiment 1.

[0042] Referring to Figures 1-4 , the water inlet 11 is connected with the filter 6 to avoid affecting the normal work of the main impeller 3 and the auxiliary impeller 4 due to the entry of large-volume soft marine organisms into the water chamber 12 (for example, the complete jellyfish wrapping the main impeller 3 will cause unbalanced vibration).

[0043] The filter 6 includes an outer cylinder 61, an inner column 62, a first shunt passage 63 and a second shunt passage 64.

[0044] The outer cylinder 61 is directly connected with the water inlet 11 (as shown in Figure 2 ), or is connected with the water inlet 11 through a water inlet elbow (the water inlet elbow is located between the outer cylinder 61 and the water inlet 11).

[0045] The inner column 62 is located in the outer cylinder 61 and is coaxially arranged, and the inner column 62 can rotate around its axis.

[0046] The first shunt passage 63 is formed by leaving a gap between the inner wall of the outer cylinder 61 and the outer wall of the inner column 62.

[0047] A plurality of second shunt passages 64 are obliquely arranged in the inner column 62, one end of the second shunt passage 64 is in communication with the end of the inner column 62 away from the water inlet 11, and the other end extends to the outer side wall of the inner column 62 and is in communication with the first shunt passage 63; the included angle between the water outlet direction of the second shunt passage 64 and the first shunt passage 63 is an acute angle (such as 30-60°).

[0048] The rotation of the inner column 62 around its axis is realized in the following way: the filter 6 further includes a support plate 65, a connecting shaft 66, a circlip 67, a sealing element 68, a rotor 69 and a stator 71.

[0049] One end of the support plate 65 is connected to the outer wall of the outer cylinder 61, and the other end is arranged close to the end of the inner column 62.

[0050] 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 via a second bearing 72 .

[0051] The clamping spring 67 is mounted on the connecting shaft 66, and the support plate 65 is located between the clamping spring 67 and the inner column 62. The clamping spring 67 plays a role of limiting and preventing falling off.

[0052] The seal 68 is used to block 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 .

[0053] The rotor 69 is mounted on the connecting shaft 66 .

[0054] The stator 71 is provided on the outer wall of the outer cylinder 61 and is used to rotate the rotor 69 .

[0055] The arrangement of support plate 65, connecting shaft 66, second bearing 72, and seal 68 enables inner column 62 to rotate about its own axis within outer cylinder 61. Rotor 69 and stator 71 form the motor drive structure. When stator 71 is energized, rotor 69 drives connecting shaft 66 and inner column 62 to rotate at high speed. Heat generated by stator 71 is dissipated by the seawater flowing through outer cylinder 61.

[0056] The seawater is sucked 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 the Figure 2 The path indicated by the dotted line is split, with part of the seawater directly entering the first diversion channel 63, and the other part of the seawater passing through the second diversion channel 64 and then returning to the water inlet 11 of the pump housing 1 together with the seawater in the first diversion channel 63. In the above process, the inner column 62 is rotated at high speed around its own axis, which can at least achieve the following effects: First, the flow areas (cross-sectional areas) of the first and second diversion channels 63, 64 are both relatively small and narrow. After entering the narrow channels, seawater, constrained by the law of conservation of mass, must increase its velocity to maintain a constant flow rate. This diversion provides a certain flow-promoting and accelerating effect on the seawater. When the seawater in the first and second diversion channels 63, 64 converge, large soft-bodied marine organisms in the seawater collide and break apart at high speed, forming small suspended matter. This is similar to the effect of traditional filtration equipment (such as a filter screen), intercepting and preventing large soft-bodied marine organisms from entering the water inlet 11 while allowing small suspended matter to enter the water inlet 11 without affecting the normal operation of the main impeller 3 and auxiliary impeller 4. Furthermore, the frequent clogging experienced by traditional filtration equipment is eliminated. After the seawater in the first and second diversion channels 63, 64 converge, its kinetic energy is not completely lost, allowing it to continue flowing rapidly.

[0057] II. When the inner column 62 rotates at high speed around its own axis, the seawater in the second diversion passage 64 will be accelerated to be thrown out / sprayed out, and the seawater flow effect is better.

[0058] III. After the seawater in the second diversion passage 64 is sprayed out of the inner column 62, a reverse thrust will be generated on the inner column 62, which offsets part of the axial force borne by the inner column 62 and the connecting shaft 66 (the axial force borne by the inner column 62 due to the seawater flowing in the outer cylinder 61), so that the axial force borne by the second bearing 72 is reduced, and the service life of the second bearing 72 is longer.

[0059] The first diversion passage 63 is provided with a spiral structure 631 on the outer wall of the inner column 62 and the inner wall of the outer cylinder 61. The spiral structure 631 can have a certain propelling effect on the seawater and a certain crushing effect on soft marine organisms.

[0060] The end of the inner column 62 away from the water inlet 11 is provided with a groove 621, and the diameter of the groove 621 gradually decreases along the water inlet direction of the groove 621; the water inlet end of the second diversion passage 64 communicates with the groove 621, and the diameter of the water outlet end of the second diversion passage 64 gradually increases. The above scheme is based on the Venturi principle (Venturi tube), which can further improve the seawater flow effect.

[0061] A plurality of cutting lines 622 are arranged in the groove 621, so that the large-volume soft marine organisms entering the groove 621 can be cut into small pieces, and the cutting and collision crushing mode can help improve the crushing effect. Marine soft organisms with too large a volume may cover the end of the groove 621 and the inner column 62, and cannot be directly cut by the cutting line 622 and then enter the second diversion passage 64; under the action of high-speed rotation of the inner column 62, the marine soft organisms with too large a volume will be thrown away and hit on the inner wall of the outer cylinder 61, thereby achieving the effect of crushing.

[0062] It should be noted that the filter of the embodiment only passively processes the large-volume soft marine organisms that have been sucked into the filter 6.

[0063] Embodiment 3

[0064] Referring to Figures 1-5 The difference between the embodiment and the embodiment 2 is that the inner column 62 can rotate around its own axis by the following way: One end of the transmission shaft 2 extends into the outer cylinder 61 and is connected to the end of the inner column 62. In this way, the transmission shaft 2 can drive the inner column 62 to rotate at high speed while driving the main impeller 3 and the auxiliary impeller 4 to rotate at high speed, and there is no need to configure an additional driving device for rotating the inner column 62 around its own axis. When the inner column 62 rotates at high speed, the seawater in the second flow separation passage 64 is accelerated and ejected; after the seawater in the second flow separation passage 64 is ejected from the inner column 62, the inner column 62 will generate a reverse thrust, which will offset part of the axial force on the transmission shaft 2 (the axial force on the transmission shaft 2 mainly comes from the pressure of the seawater flow on the main impeller 3 and the auxiliary impeller 4), so that the axial jumping and vibration of the transmission shaft 2 are smaller, and the axial force on the first bearing 51 of the transmission shaft 2 is smaller, and the service life of the first bearing 51 is longer.

[0065] Finally, it should be noted that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art can make various changes and modifications to the present application, and the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other without conflict. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A seawater pump, characterized in that: include: A pump housing having a water inlet, a water pressure chamber and a water outlet connected in sequence, wherein the water inlet is perpendicular to the pump housing and is detachably connected to a water inlet elbow; A transmission shaft, one end of which rotates and seals through the pump casing and then extends into the water pressure chamber, and the other end rotates and passes through the bearing body and is used to connect to the drive motor; A main impeller is located in the water pressure chamber, and the main impeller is installed on the transmission shaft and close to the water inlet; An auxiliary impeller is located in the water pressure chamber, the auxiliary impeller is installed on the transmission shaft and is located between the main impeller and the pump casing; in: The blades on the main impeller are made of copper, and the blades on the auxiliary impeller are made of rubber; The main impeller is provided with a plurality of main impeller screw holes distributed in a circumferential array, the main impeller screw holes pass through the main impeller, and the axes of the main impeller screw holes are parallel to the axis of the transmission shaft; The water inlet is connected with a filter.

2. The seawater pump according to claim 1, characterized in that The pump casing, the water inlet elbow and the main impeller are molded using wet phenolic resin coated sand.

3. The seawater pump according to claim 1, characterized in that The filter includes: an outer cylinder connected to the water inlet; An inner column is located in the outer cylinder, and the two are coaxially arranged; a first diversion channel formed by leaving a gap between the inner wall of the outer cylinder and the outer wall of the inner column; a second diversion channel, wherein a plurality of the second diversion channels are obliquely arranged in the inner column, one end of the second diversion channel is connected to an 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; Wherein, 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.

4. The seawater pump according to claim 3, characterized in that One end of the transmission shaft extends into the outer cylinder and is connected to the end of the inner column.

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

6. The seawater pump according to claim 5, characterized in that The filter also includes: a rotor mounted on the connecting shaft; The stator is arranged on the outer wall of the outer cylinder and is used to rotate the rotor.

7. The seawater pump according to claim 3, characterized in that 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.

8. The seawater pump according to claim 7, characterized in that A plurality of cutting lines are arranged in the groove.

9. The seawater pump according to any one of claims 3 to 8, characterized in that: A spiral structure is provided in the first diversion channel, and the spiral structure is located on the outer wall of the inner column.

10. The seawater pump according to claim 9, characterized in that The inner wall of the outer cylinder also has a spiral structure.

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