Fresh water pump with noise and vibration reduction

Abstract

The application discloses a fresh water pump with noise reduction and vibration reduction, and relates to the technical field of fresh water pumps.The fresh water pump comprises a driving assembly, a pump body, a secondary impeller, a primary impeller, a steam elimination shell, a floating compensation assembly and a flow slowing assembly.The steady flow channel formed by the inner wall of the floating ring and the secondary rectification through the rectifier grid make the fresh water after flow slowing and pressure reduction further be guided to a relatively stable flow state, so that the deflection, rotational flow and local turbulence of the water flow before entering the primary impeller are reduced, and the vibration and noise caused by the unstable inlet flow state are reduced.When the primary impeller and the secondary impeller accelerate rotation and cause the instantaneous increase of the suction demand at the suction inlet of the pump body, the floating ring can slide towards the pump body under the action of the pressure difference, the blocking section is gradually separated from the compensation inlet, the compensation outlet and the compensation inlet are overlapped and communicated, and the fresh water in the compensation cavity is supplemented into the steady flow channel.The instantaneous low pressure in the steady flow channel is compensated, and the pressure stability of the front end of the suction inlet of the pump body is improved.

Description

Technical Field

[0001] This invention relates to the field of freshwater pump technology, specifically a freshwater pump with noise reduction and vibration damping. Background Technology

[0002] In cooling systems, freshwater pumps typically function as circulating coolant, continuously propelling the flow of freshwater to remove heat generated during equipment operation from the heat-generating areas and maintain the continuity and stability of the internal media circulation. Since freshwater pumps often operate for extended periods, their operational reliability, supply stability, noise level, and ease of maintenance directly impact the overall performance of the cooling system.

[0003] When a freshwater pump starts up, accelerates, or experiences a sudden increase in flow rate at the water supply end, the suction intensity at the inlet of the first-stage impeller increases instantaneously, easily causing a drop in pressure at the pump body's suction inlet. When this pressure falls below the vaporization pressure of the cooling freshwater at the current temperature, the cooling freshwater undergoes localized vaporization, generating bubbles. These bubbles, carried by the water flow, enter the high-pressure areas of the impeller and pump body and rapidly collapse, causing cavitation. This cavitation continuously impacts the impeller surface and pump body flow channels, leading to structural vibration and increased operating noise. Summary of the Invention

[0004] The purpose of this invention is to provide a noise-reducing and vibration-damping freshwater pump to solve the problem of cavitation caused by pressure drop at the pump inlet in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a noise-reducing and vibration-damping freshwater pump, comprising a pump body and a pressure-reducing and steam-eliminating unit, a drive assembly is mounted on the pump body, a secondary impeller and a primary impeller are mounted on the output shaft of the drive assembly, the secondary impeller is rotatably connected to the pump body, and the primary impeller is rotatably connected to the pump body. The pressure reduction and steam elimination unit includes a steam elimination shell and a floating compensation component. The steam elimination shell is installed at the bottom of the pump body, and a flow slowing component is installed inside the pump body. The floating compensation assembly includes a floating ring with a compensation flange. The floating ring is slidably connected to the exhaust housing. Several sliding reset parts are circumferentially installed on the compensation flange. The sliding reset parts are slidably installed inside the exhaust housing. A flow rectifier grid is installed inside the floating ring. The floating ring has a blocking section. Several compensation outlets are provided on the side wall of the floating ring. The compensation outlets are located below the blocking section.

[0006] The freshwater pump is equipped with an external electrical control unit (ECU) for operating the pump. The drive unit can be a permanent magnet motor.

[0007] During operation, the electronic control unit starts the permanent magnet motor, and the output shaft of the permanent magnet motor drives the primary and secondary impellers, which are installed in the pump body, to rotate synchronously. Cooling fresh water enters the pump body through the pressure reducing and degassing unit. The primary impeller first drives the cooling fresh water to rotate and pressurize it. Guide vanes guide and rectify the rotating water flow discharged from the primary impeller, allowing the water flow to enter the secondary impeller in a relatively stable state. Subsequently, the secondary impeller continues to perform a second work on the cooling fresh water based on the pressurization of the primary impeller, further increasing the pressure of the cooling fresh water to meet the overall head requirements of the pump set. Finally, the high-speed water flow pressurized by the secondary impeller enters the pump casing, and then is transported to the water-using end through the outlet on the casing and external pipes, thus completing the continuous intake, staged pressurization, and discharge of cooling fresh water.

[0008] Furthermore, the degassing shell is provided with a multi-stage liquid treatment chamber, an inner ring, and a sliding cavity within the inner ring. A sliding reset component is slidably installed in the sliding cavity, and a floating ring is slidably connected to the inner ring. The bottom end of the degassing shell is provided with a liquid inlet, and the degassing shell is connected to the liquid delivery pipeline through the liquid inlet. The slow-flow component is installed in the multi-stage liquid treatment chamber.

[0009] Furthermore, the multi-stage liquid treatment chamber includes a slow-flow chamber and a pressure-reducing chamber, the slow-flow chamber and the pressure-reducing chamber are connected, the slow-flow component is installed between the slow-flow chamber and the pressure-reducing chamber, and the inner ring and the shell wall of the degassing shell form a compensation chamber, which is connected to the pressure-reducing chamber. The inner wall of the floating ring forms a flow stabilizing channel, the pressure reducing chamber is connected to the flow stabilizing channel, and the flow stabilizing channel is connected to the pump body.

[0010] The volume of the slow-flow chamber is smaller than that of the decompression chamber.

[0011] Furthermore, the inner ring is equipped with several compensation inlets, which are connected to the compensation cavity.

[0012] After being depressurized and slowed down in the pressure reducing chamber, the fresh water continues to enter the flow stabilization channel formed by the inner wall of the floating ring. The water flows in the flow stabilization channel along the direction of the pump body inlet and undergoes secondary rectification through the rectifier grid. This further guides the fresh water, which has been diverted by the slow flow chamber and buffered by the pressure reducing chamber, into a more stable flow state, thereby achieving multi-stage slow flow, pressure reduction and flow stabilization treatment of the cooling fresh water before it enters the impeller.

[0013] When the drive assembly accelerates the rotation of the primary and secondary impellers within the pump body, the suction demand at the pump body inlet increases instantaneously, causing the pressure in the flow stabilizing channel near the pump body to decrease relative to the pressure reducing chamber and compensation chamber. At this time, a pressure difference is formed between the two ends of the floating ring. Under the action of this pressure difference, the floating ring slides towards the pump body and, through the compensation flange, drives the sliding reset component to slide within the sliding chamber of the inner ring, compressing the elastic element.

[0014] Initially, the floating ring remains in the blocked position under the action of the sliding reset component. The blocked section of the floating ring blocks the compensation inlet on the inner ring, isolating the compensation chamber from the flow stabilizing channel. Fresh water mainly enters the pump body through the flow stabilizing channel and the rectifier grid. As the floating ring slides towards the pump body under the action of the pressure difference, the blocked section on the floating ring gradually disengages from the compensation inlet. Simultaneously, the compensation outlet on the floating ring gradually overlaps and connects with the compensation inlet, thus connecting the compensation chamber to the flow stabilizing channel sequentially through the compensation inlet and compensation outlet. As the pressure difference further increases, the overlap area of ​​the compensation inlet and compensation outlet increases synchronously, expanding the flow path between the compensation chamber and the flow stabilizing channel, and increasing the amount of liquid replenished from the compensation chamber to the flow stabilizing channel. The fresh water in the compensation chamber replenishes the flow stabilizing channel through the compensation inlet and compensation outlet, compensating for the instantaneous low pressure in the flow stabilizing channel, thereby improving the pressure stability at the pump body inlet front end, reducing the probability of local vaporization of cooling fresh water caused by a sudden drop in pump body inlet pressure, and reducing the risk of cavitation.

[0015] Once the pressure at the pump inlet stabilizes, the elastic element rebounds and pushes the floating ring back to its original position via the slide rod and the slide plug. This reduces the flow path between the compensation chamber and the flow stabilizing channel until it closes, restoring normal liquid supply.

[0016] Furthermore, the flow-slowing component includes a flow-slowing cone, with a cone head at the bottom end. Several connecting grids are circumferentially and equidistantly installed on the flow-slowing cone, forming a primary rectification structure. The connecting grids are connected to the shell wall of the exhaust casing.

[0017] When freshwater passes through the pressure reducing and steam elimination unit, it first enters the slow-flow chamber through the inlet via a pipe. Upon entering the chamber, the freshwater first contacts the cone head. The cone head uses its conical surface structure to disperse and buffer the inlet water flow, preventing the freshwater from directly impacting the central area of ​​the slow-flow chamber and forming a localized high-speed jet. Subsequently, the freshwater diffuses outwards along the outer circumference of the slow-flow cone and passes through the primary rectification structure formed between several connecting grids. Because these connecting grids are equidistantly arranged circumferentially along the slow-flow cone, they can separate the freshwater entering the chamber into multiple circumferentially distributed water flows, evenly distributing the originally concentrated water flow and initially weakening any deviations, swirling flows, and turbulence in the water flow, thus completing the primary rectification.

[0018] Subsequently, the freshwater, after primary rectification, enters the pressure-reducing chamber. Because the volume of the pressure-reducing chamber is larger than that of the slow-flow chamber, the flow space suddenly increases after the freshwater enters the pressure-reducing chamber, resulting in a corresponding decrease in water velocity. This releases the impact kinetic energy carried by the water flow, thereby mitigating pressure fluctuations and preventing the freshwater from directly entering the subsequent flow channels in a high-speed jet state. This achieves further deceleration and pressure reduction effects based on the primary rectification of the slow-flow component.

[0019] Furthermore, the sliding reset component includes a slide rod, with the bottom ends of several circumferentially arranged slide rods connected to a compensating flange, and a slide plug installed at the top of the slide rod. The slide plug is slidably installed in the sliding cavity, and an elastic element is installed between the slide plug and the sliding cavity.

[0020] The elastic element can be a spring.

[0021] Furthermore, the rectifier grille is located at the end of the flow stabilization channel, and several compensation outlets are connected to the flow stabilization channel.

[0022] Furthermore, the pump body is equipped with a liquid outlet, through which the pump body is connected to the pipeline.

[0023] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the cooperation of the cone head, the slow-flow cone body and the circumferentially spaced connecting grids, the fresh water entering from the inlet is first dispersed and buffered by the cone head, and then circumferentially divided by the primary rectification structure formed by the connecting grids. This can reduce the local high-speed jet formed by the direct impact of water flow on the central area of ​​the slow-flow cavity, and weaken the deflection, swirling and turbulent flow in the inlet water flow, so that the fresh water forms a more uniform flow state before entering the subsequent flow channel.

[0024] 2. Since the volume of the pressure reducing chamber is larger than that of the slow-flow chamber, the flow space increases after fresh water enters the pressure reducing chamber from the slow-flow chamber, the water flow velocity decreases, and the impact kinetic energy is released, thereby mitigating the fluctuation of water flow pressure.

[0025] 3. After being treated by the pressure reducing chamber, the fresh water enters the steady flow channel formed by the inner wall of the floating ring, and undergoes secondary rectification through the rectifier grid. This further guides the fresh water, which has been slowed down and depressurized, into a more stable flow state, reducing the deflection, swirling and local turbulence before the water enters the first impeller. This improves the flow state at the impeller inlet and reduces the vibration and noise caused by the unstable flow state at the inlet.

[0026] 4. When the accelerated rotation of the primary and secondary impellers causes a sudden increase in suction demand at the pump inlet, the floating ring can slide towards the pump body under the action of the pressure difference. This allows the sealing section to gradually disengage from the compensation inlet and the compensation outlet to overlap and connect with the compensation inlet, thereby allowing fresh water in the compensation chamber to enter the stabilizing flow channel. This compensates for the instantaneous low pressure in the stabilizing flow channel, improves the pressure stability at the front end of the pump inlet, reduces the probability of local vaporization of cooling fresh water, and lowers the risk of cavitation. Attached Figure Description

[0027] Figure 1 This is an overall elevation view of the freshwater pump of the present invention; Figure 2 This is a partial elevation view of the freshwater pump of the present invention; Figure 3 This is a cross-sectional view of the freshwater pump of the present invention; Figure 4This is a cross-sectional view of the pressure reduction and steam elimination unit of the present invention; Figure 5 This is a cross-sectional view of the steam exhaust shell of the present invention; Figure 6 This is an elevation view of the floating compensation component of the present invention; Figure 7 For the present invention Figure 4 A magnified view of a portion of region A in the middle; Figure 8 For the present invention Figure 5 A magnified view of a portion of region B in the middle.

[0028] In the diagram: 1. Drive assembly; 2. Pump body; 3. Secondary impeller; 4. Primary impeller; 5. Exhaust housing; 6. Floating compensation assembly; 7. Flow-slowing assembly; 8. Flow-slowing chamber; 9. Pressure-reducing chamber; 10. Compensation chamber; 21. Outlet; 51. Compensation inlet; 52. Inner ring; 53. Sliding chamber; 54. Inlet; 61. Rectifying grid; 62. Floating ring; 63. Compensation flange; 64. Sliding reset component; 65. Compensation outlet; 66. Blocking section; 641. Sliding rod; 642. Sliding plug; 643. Elastic component; 71. Flow-slowing cone; 72. Cone head; 73. Connecting grid. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1-3 and Figures 5-8 The first embodiment of the present invention shown includes a noise reduction and vibration reduction freshwater pump comprising a pump body 2 and a pressure reducing and steam elimination unit. A drive assembly 1 is installed on the pump body 2. A secondary impeller 3 and a primary impeller 4 are installed on the output shaft of the drive assembly 1. The secondary impeller 3 is rotatably connected to the pump body 2, and the primary impeller 4 is rotatably connected to the pump body 2. The pump body 2 is provided with a liquid outlet 21, and the pump body 2 is connected to a pipeline through the liquid outlet 21.

[0031] The pressure reducing and steam elimination unit includes a steam elimination shell 5 and a floating compensation component 6. The steam elimination shell 5 is installed at the bottom of the pump body 2, and a flow slowing component 7 is installed inside the pump body 2. The floating compensation component 6 includes a floating ring 62, which is provided with a compensation flange 63. The floating ring 62 is slidably connected to the steam elimination shell 5. Several sliding reset parts 64 are circumferentially installed on the compensation flange 63. The sliding reset parts 64 are slidably installed inside the steam elimination shell 5. A flow straightening grid 61 is installed inside the floating ring 62. A blocking section 66 is provided on the floating ring 62. Several compensation outlets 65 are provided on the side wall of the floating ring 62. The compensation outlets 65 are located below the blocking section 66.

[0032] The freshwater pump is equipped with an external electrical control unit (ECU) for operating the pump. The drive assembly 1 can be a permanent magnet motor. During operation, the ECU controls the permanent magnet motor to start, and the motor's output shaft drives the primary impeller 4 and secondary impeller 3, both housed within the pump body 2, to rotate synchronously. After entering the pump body 2 through the pressure reducing and degassing unit, the primary impeller 4 first rotates and pressurizes the cooling water. Guide vanes guide and rectify the rotating water flow discharged from the primary impeller 4, ensuring a relatively stable flow into the secondary impeller 3. Subsequently, the secondary impeller 3, building upon the primary pressurization, performs a second round of work on the cooling water, further increasing its pressure to meet the overall head requirements of the pump unit. Finally, the high-speed water flow, pressurized by the secondary impeller 3, enters the volute of the pump body 2, and is then transported to the water-using end via the outlet 21 on the volute and external pipes, thus completing the continuous intake, staged pressurization, and discharge of the cooling water.

[0033] The degassing housing 5 is provided with a multi-stage liquid treatment chamber. The degassing housing 5 is provided with an inner ring 52, and a sliding cavity 53 is provided in the inner ring 52. The sliding reset component 64 is slidably installed in the sliding cavity 53. The floating ring 62 is slidably connected to the inner ring 52. The bottom end of the degassing housing 5 is provided with a liquid inlet 54. The degassing housing 5 is connected to the liquid delivery pipeline through the liquid inlet 54. The slow flow component 7 is installed in the multi-stage liquid treatment chamber.

[0034] The multi-stage liquid treatment chamber includes a flow-regulating chamber 8 and a pressure-reducing chamber 9, which are connected. A flow-regulating assembly 7 is installed between the flow-regulating chamber 8 and the pressure-reducing chamber 9. A compensation chamber 10 is formed between the inner ring 52 and the shell wall of the degassing housing 5, and is connected to the pressure-reducing chamber 9. The inner wall of the floating ring 62 forms a flow-stabilizing channel, which is connected to the pressure-reducing chamber 9 and the pump body 2. The volume of the flow-regulating chamber 8 is smaller than that of the pressure-reducing chamber 9.

[0035] The inner ring 52 is provided with several compensation inlets 51, which are connected to the compensation cavity 10.

[0036] After being depressurized by the pressure reducing chamber 9, the fresh water continues to enter the flow stabilization channel formed by the inner wall of the floating ring 62. The water flows in the flow stabilization channel along the suction direction of the pump body 2, and undergoes secondary rectification by the flow rectifier grid 61. This further guides the fresh water, which has been diverted by the slow flow chamber 8 and buffered by the pressure reducing chamber 9, to a more stable flow state, thereby achieving multi-stage slow flow, pressure reduction and flow stabilization treatment of the cooling fresh water before it enters the impeller.

[0037] When the drive assembly 1 drives the primary impeller 4 and secondary impeller 3 inside the pump body 2 to rotate at an accelerated speed, the suction demand at the suction inlet of the pump body 2 increases instantaneously, causing the pressure in the flow stabilizing channel near the pump body 2 to decrease relative to the pressure reducing chamber 9 and the compensation chamber 10. At this time, a pressure difference is formed at both ends of the floating ring 62. Under the action of this pressure difference, the floating ring 62 slides towards the pump body 2, and through the compensation flange 63, it drives the sliding reset member 64 to slide in the sliding chamber 53 of the inner ring 52, and the elastic member 643 is compressed.

[0038] Initially, the floating ring 62 is held in a blocked position by the sliding reset member 64. The blocking section 66 of the floating ring 62 blocks the compensation inlet 51 on the inner ring 52, isolating the compensation chamber 10 from the flow stabilizing channel. Fresh water mainly enters the pump body 2 through the flow stabilizing channel and the rectifier grid 61. As the floating ring 62 slides towards the pump body 2 under the action of the pressure difference, the blocking section 66 on the floating ring 62 gradually disengages from the compensation inlet 51. At the same time, the compensation outlet 65 on the floating ring 62 gradually overlaps and connects with the compensation inlet 51, thereby connecting the compensation chamber 10 to the flow stabilizing channel through the compensation inlet 51 and the compensation outlet 65 in sequence. As the pressure difference further increases, the overlap area of ​​the compensation inlet 51 and the compensation outlet 65 increases synchronously, the flow path between the compensation chamber 10 and the flow stabilizing channel expands, and the amount of liquid replenished from the compensation chamber 10 to the flow stabilizing channel increases accordingly. Fresh water in the compensation chamber 10 is fed into the flow stabilization channel through the compensation inlet 51 and the compensation outlet 65 to compensate for the instantaneous low pressure in the flow stabilization channel, thereby improving the pressure stability at the front end of the pump body 2 suction inlet, reducing the probability of local vaporization of cooling fresh water caused by a sudden drop in the inlet pressure of the pump body 2, and reducing the risk of cavitation.

[0039] After the pressure at the suction inlet of pump body 2 stabilizes, the elastic element 643 rebounds and pushes the floating ring 62 back to its original position through the sliding rod 641 and the sliding plug 642. The flow path between the compensation chamber 10 and the flow stabilizing channel is reduced until it is closed, and normal liquid supply is restored.

[0040] The sliding reset component 64 includes a slide rod 641. The bottom ends of several circumferentially arranged slide rods 641 are connected to the compensation flange 63. A slide plug 642 is installed at the top of the slide rod 641. The slide plug 642 is slidably installed in the sliding cavity 53. An elastic element 643 is installed between the slide plug 642 and the sliding cavity 53.

[0041] The elastic element 643 can be a spring.

[0042] The rectifier grille 61 is located at the end of the flow stabilization channel, and several compensation outlets 65 are connected to the flow stabilization channel.

[0043] like Figure 4 The second embodiment of the present invention shows a noise reduction and vibration damping freshwater pump with a different flow-slowing component 7 mechanism than the first embodiment. The difference is that the flow-slowing component 7 includes a flow-slowing cone 71, a cone head 72 at the bottom end of the flow-slowing cone 71, and a plurality of connecting grids 73 are circumferentially and equidistantly installed on the flow-slowing cone 71. The plurality of connecting grids 73 form a primary rectification structure, and the connecting grids 73 are connected to the shell wall of the degassing shell 5.

[0044] The cone 72 is used to receive and disperse the inlet water flow entering from the inlet 54, so that the concentrated fresh water enters and diffuses along the cone surface of the cone 72 to the outer periphery of the slow-flow cone 71, thereby reducing the local high-speed jet formed by the direct impact of the water flow on the central area of ​​the slow-flow cavity 8. The slow-flow cone 71 is used to guide the fresh water dispersed by the cone 72 to diffuse in a circumferential direction. Several connecting grids 73 are equidistantly arranged around the slow-flow cone 71 to form a primary rectification structure on the outer periphery of the slow-flow cone 71, dividing the fresh water entering the slow-flow cavity 8 into multiple circumferentially distributed water flow channels, thereby uniformly distributing the inlet water flow and weakening the deflection, swirling and turbulent flow in the water flow, so that the fresh water forms a relatively uniform and stable flow state before entering the subsequent depressurization cavity 9.

[0045] The working principle of this invention is as follows: During operation, the electronic control unit controls the permanent magnet motor to start, and the output shaft of the permanent magnet motor drives the first-stage impeller 4 and the second-stage impeller 3, which are installed inside the pump body 2, to rotate synchronously. After the cooling fresh water enters the pump body 2 through the pressure reducing and degassing unit, the first-stage impeller 4 first drives the cooling fresh water to rotate and pressurize it. The guide vanes guide and rectify the rotating water flow discharged from the first-stage impeller 4, so that the water flow enters the second-stage impeller 3 in a relatively stable state. Subsequently, the second-stage impeller 3 continues to perform a second work on the cooling fresh water based on the first-stage pressurization, so that the pressure of the cooling fresh water is further increased to meet the overall head requirements of the pump set. Finally, the high-speed water flow pressurized by the second-stage impeller 3 enters the volute of the pump body 2, and is then transported to the water-using end through the liquid outlet 21 on the volute and the external pipeline, thereby completing the continuous intake, staged pressurization and discharge of cooling fresh water.

[0046] When fresh water passes through the pressure reducing and steam elimination unit, it first enters the slow-flow chamber 8 through the inlet 54. Upon entering the slow-flow chamber 8, the fresh water first contacts the cone 72. The cone 72 uses its conical structure to disperse and buffer the inlet water flow, preventing the fresh water from directly impacting the central area of ​​the slow-flow chamber 8 and forming a localized high-speed jet. Subsequently, the fresh water diffuses outwards along the outer periphery of the slow-flow cone 71 and passes through the primary rectification structure formed between several connecting grids 73. Because the connecting grids 73 are equidistantly arranged circumferentially along the slow-flow cone 71, they can divide the fresh water entering the slow-flow chamber 8 into multiple circumferentially distributed water flows, uniformly distributing the originally concentrated water flow and initially weakening the deflection, swirling, and turbulent flows, thus completing the primary rectification.

[0047] Subsequently, the freshwater, after primary rectification, enters the pressure-reducing chamber. Because the volume of the pressure-reducing chamber is larger than that of the slow-flow chamber, the flow space suddenly increases after the freshwater enters the pressure-reducing chamber, resulting in a corresponding decrease in water velocity. This releases the impact kinetic energy carried by the water flow, thereby mitigating pressure fluctuations and preventing the freshwater from directly entering the subsequent flow channels in a high-speed jet state. This achieves further deceleration and pressure reduction effects based on the primary rectification of the slow-flow component.

[0048] After being depressurized by the pressure reducing chamber 9, the fresh water continues to enter the flow stabilization channel formed by the inner wall of the floating ring 62. The water flows in the flow stabilization channel along the suction direction of the pump body 2, and undergoes secondary rectification by the flow rectifier grid 61. This further guides the fresh water, which has been diverted by the slow flow chamber 8 and buffered by the pressure reducing chamber 9, to a more stable flow state, thereby achieving multi-stage slow flow, pressure reduction and flow stabilization treatment of the cooling fresh water before it enters the impeller.

[0049] When the drive assembly 1 drives the primary impeller 4 and secondary impeller 3 inside the pump body 2 to rotate at an accelerated speed, the suction demand at the suction inlet of the pump body 2 increases instantaneously, causing the pressure in the flow stabilizing channel near the pump body 2 to decrease relative to the pressure reducing chamber 9 and the compensation chamber 10. At this time, a pressure difference is formed at both ends of the floating ring 62. Under the action of this pressure difference, the floating ring 62 slides towards the pump body 2, and through the compensation flange 63, it drives the sliding reset member 64 to slide in the sliding chamber 53 of the inner ring 52, and the elastic member 643 is compressed.

[0050] Initially, the floating ring 62 is held in a blocked position by the sliding reset member 64. The blocking section 66 of the floating ring 62 blocks the compensation inlet 51 on the inner ring 52, isolating the compensation chamber 10 from the flow stabilizing channel. Fresh water mainly enters the pump body 2 through the flow stabilizing channel and the rectifier grid 61. As the floating ring 62 slides towards the pump body 2 under the action of the pressure difference, the blocking section 66 on the floating ring 62 gradually disengages from the compensation inlet 51. At the same time, the compensation outlet 65 on the floating ring 62 gradually overlaps and connects with the compensation inlet 51, thereby connecting the compensation chamber 10 to the flow stabilizing channel through the compensation inlet 51 and the compensation outlet 65 in sequence. As the pressure difference further increases, the overlap area of ​​the compensation inlet 51 and the compensation outlet 65 increases synchronously, the flow path between the compensation chamber 10 and the flow stabilizing channel expands, and the amount of liquid replenished from the compensation chamber 10 to the flow stabilizing channel increases accordingly. Fresh water in the compensation chamber 10 is fed into the flow stabilization channel through the compensation inlet 51 and the compensation outlet 65 to compensate for the instantaneous low pressure in the flow stabilization channel, thereby improving the pressure stability at the front end of the pump body 2 suction inlet, reducing the probability of local vaporization of cooling fresh water caused by a sudden drop in the inlet pressure of the pump body 2, and reducing the risk of cavitation.

[0051] After the pressure at the suction inlet of pump body 2 stabilizes, the elastic element 643 rebounds and pushes the floating ring 62 back to its original position through the slide rod 641 and the slide plug 642. The flow path between the compensation chamber 10 and the flow stabilizing channel is reduced until it is closed, and normal liquid supply is restored.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A freshwater pump with noise reduction and vibration damping, characterized in that: The freshwater pump includes a pump body (2) and a pressure reducing and steam eliminating unit. A drive assembly (1) is installed on the pump body (2). A secondary impeller (3) and a primary impeller (4) are installed on the output shaft of the drive assembly (1). The secondary impeller (3) is rotatably connected to the pump body (2), and the primary impeller (4) is rotatably connected to the pump body (2). The pressure reduction and steam elimination unit includes a steam elimination shell (5) and a floating compensation component (6). The steam elimination shell (5) is installed at the bottom of the pump body (2), and a flow slowing component (7) is installed inside the pump body (2). The floating compensation component (6) includes a floating ring (62), a compensation flange (63) on the floating ring (62), the floating ring (62) is slidably connected to the exhaust housing (5), a plurality of sliding reset parts (64) are circumferentially installed on the compensation flange (63), the sliding reset parts (64) are slidably installed in the exhaust housing (5), a rectifier grille (61) is installed in the floating ring (62), a blocking section (66) is provided on the floating ring (62), a plurality of compensation outlets (65) are provided on the side wall of the floating ring (62), and the compensation outlets (65) are located below the blocking section (66).

2. The noise-reducing and vibration-damping freshwater pump according to claim 1, characterized in that: The degassing housing (5) is provided with a multi-stage liquid treatment chamber. The degassing housing (5) is provided with an inner ring (52). The inner ring (52) is provided with a sliding chamber (53). The sliding reset component (64) is slidably installed in the sliding chamber (53). The floating ring (62) is slidably connected to the inner ring (52). The bottom end of the degassing housing (5) is provided with a liquid inlet (54). The degassing housing (5) is connected to the liquid delivery pipeline through the liquid inlet (54). The slow flow component (7) is installed in the multi-stage liquid treatment chamber.

3. A freshwater pump with noise reduction and vibration damping according to claim 2, characterized in that: The multi-stage liquid treatment chamber includes a slow-flow chamber (8) and a pressure-reducing chamber (9). The slow-flow chamber (8) is connected to the pressure-reducing chamber (9). The slow-flow assembly (7) is installed between the slow-flow chamber (8) and the pressure-reducing chamber (9). The inner ring (52) and the shell wall of the degassing shell (5) form a compensation chamber (10). The compensation chamber (10) is connected to the pressure-reducing chamber (9). The inner wall of the floating ring (62) forms a flow stabilizing channel, the pressure reducing chamber (9) is connected to the flow stabilizing channel, and the flow stabilizing channel is connected to the pump body (2).

4. A freshwater pump with noise reduction and vibration damping according to claim 3, characterized in that: The inner ring (52) is provided with a plurality of compensation inlets (51), which are connected to the compensation cavity (10).

5. A freshwater pump with noise reduction and vibration damping according to any one of claims 1-4, characterized in that: The slow-flow component (7) includes a slow-flow cone (71), the bottom end of which is provided with a cone head (72). Several connecting grids (73) are circumferentially and equidistantly installed on the slow-flow cone (71). The several connecting grids (73) form a primary rectification structure. The connecting grids (73) are connected to the shell wall of the exhaust housing (5).

6. A freshwater pump with noise reduction and vibration damping according to claim 2, characterized in that: The sliding reset component (64) includes a slide rod (641), the bottom ends of several circumferentially arranged slide rods (641) are connected to the compensation flange (63), a slide plug (642) is installed at the top of the slide rod (641), the slide plug (642) is slidably installed in the sliding cavity (53), and an elastic element (643) is installed between the slide plug (642) and the sliding cavity (53).

7. A freshwater pump with noise reduction and vibration damping according to claim 3, characterized in that: The rectifier grille (61) is located at the end of the flow stabilization channel, and several of the compensation outlets (65) are connected to the flow stabilization channel.

8. A freshwater pump with noise reduction and vibration damping according to any one of claims 1-4, characterized in that: The pump body (2) is provided with a liquid outlet (21), and the pump body (2) is connected to the pipeline through the liquid outlet (21).

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