High-efficiency low-noise self-balancing multistage centrifugal water pump

Abstract

The utility model relates to the technical field of water pumps, in particular to an efficient low-noise self-balancing multistage centrifugal water pump which comprises a pump body support, a bearing seat is fixedly connected to the top of the pump body support, a pump shell is fixedly connected to one side of the bearing seat through a connecting support, and a pump shaft is arranged on one side of the bearing seat. The end of the pump shaft penetrates through the bearing seat, extends into the pump shell and is connected with an impeller. Through cooperative work of the balance ring, the balance hole, the connecting pipe, the supporting ring pipe and the balance pipe, the effect of guiding high-pressure liquid at the rear end of the impeller back into a suction chamber is achieved, the pressure difference of the two sides of the impeller is remarkably reduced, the axial force is efficiently balanced, and a balance cavity formed by the balance ring, the rear end cover plate and the pump shell is used in cooperation with a sealing ring layer to prevent large-amount liquid leakage. And the pressure in the cavity is stabilized, the balance hole is assisted to play a balance role more stably, the axial force balance effect is enhanced, and the device can adapt to working condition changes.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pump technical field especially relates to a high -efficient low -noise self -balancing multistage centrifugal water pump. BACKGROUND

[0002] Multistage centrifugal water pump is applied to industrial liquid delivery and city water supply and drainage, high -rise building pressure supply water, garden sprinkling irrigation, fire fighting pressure boost, long -distance water delivery, heating, bathroom cold and warm water circulation pressure boost and equipment matching and air conditioning unit circulation, cooling water delivery etc., through the high -speed rotation impeller drive water flow pressure boost flow, cooperate with the flow guide chamber collection enters next flow guide chamber realizes multistage pressure boost.

[0003] But in the use process of multistate centrifugal water pump usually produces noise, the noise produced when the water pump runs not only will disturb the surrounding work and living environment, long -term in high noise environment also can cause damage to the hearing of the operator, and some noise reduction methods of existing usually adopt simple sound insulation cover, although can obstruct noise propagation to a certain extent, but cannot reduce noise from the root, and will increase the equipment volume and cost. Meanwhile, the problem of axial force imbalance also seriously affects the stability and service life of the water pump, when the multistage centrifugal water pump works, the pressure difference of the impeller two sides will produce larger axial force, and the traditional balance disc and balance drum structure is complex, and the manufacturing and maintenance cost is high, and in some scenes of frequent work condition change, it is difficult to quickly and accurately realize the axial force balance, if the balance is not effective, the pump shaft wear is aggravated, the bearing service life is shortened, and the production efficiency is reduced. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving the shortcomings in the prior art and provides a high -efficient low -noise self -balancing multistage centrifugal water pump.

[0005] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A kind of high -efficient low -noise self -balancing multistage centrifugal water pump, including pump body support, the top of the pump body support is fixedly connected with bearing seat, the side of the bearing seat is fixedly connected with pump shell by connecting support, the side of the bearing seat is provided with pump shaft, the end of the pump shaft is extended to the inside of pump shell and is connected with impeller and passes through bearing seat;

[0007] The side of the impeller is provided with rear end cover plate, the side of the rear end cover plate is fixedly connected with balance ring, the inner wall of the balance ring is equipped with several balance holes, the balance hole is connected with connecting pipe, one end of the connecting pipe is fixedly connected with support ring pipe, the both ends of the connecting pipe are in communication with balance ring and support ring pipe, the outer wall of the support ring pipe is fixedly connected with balance pipe.

[0008] Preferably, the inner wall of the pump shell is fixedly connected with a micro-perforated plate, a plurality of plate holes are formed in the micro-perforated plate, an air layer is fixedly connected between the micro-perforated plate and the inner wall of the pump shell, and the air layer is fixedly connected with an acoustic cotton layer on the side close to the pump shell.

[0009] Preferably, the side, away from the bearing seat, of the pump shell is fixedly connected with a suction connecting pipe, the suction connecting pipe is in communication with the inside of the pump shell and forms a suction chamber, and the end, away from the support ring pipe, of the balance pipe penetrates through the suction connecting pipe and extends into the suction chamber to form a flow channel.

[0010] Preferably, the end of the balance ring is fixedly connected with a sealing ring layer.

[0011] Preferably, the top of the pump shell is fixedly connected with a diffuser pipe, and the diffuser pipe is in communication with the inside of the pump shell.

[0012] The utility model discloses a beneficial effect is:

[0013] Through the cooperative work of the balance ring, the balance hole, the connecting pipe, the support ring pipe and the balance pipe, the high-pressure liquid at the rear end of the impeller is introduced back to the suction chamber, the pressure difference on both sides of the impeller is significantly reduced, the axial force is balanced efficiently, the balance cavity formed by the balance ring, the rear end cover plate and the pump shell is used in cooperation with the sealing ring layer to prevent liquid from leaking in large quantities, the pressure in the cavity is stabilized, the balance hole plays a balancing role more stably, the axial force balancing effect is enhanced, and the utility model can adapt to working condition changes, overcome the drawbacks of the traditional balance disc and balance drum structure, such as complex structure, high manufacturing and maintenance cost and difficulty in quickly and accurately balancing axial force in the case of variable working conditions, and effectively prolong the overall service life of the multistage centrifugal water pump.

[0014] When the noise sound wave caused by the operation of the impeller is transmitted to the micro-perforated plate on the inner wall of the pump shell, the air column in the plate hole vibrates, the air and the hole wall rub to convert sound energy into heat energy loss, and then the air layer resonates and absorbs sound, and the acoustic cotton layer further absorbs sound, realizing wideband noise reduction. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 A general structure schematic diagram of the utility model is provided.

[0016] Fig. 2 A structure schematic diagram of the impeller of the utility model is provided.

[0017] Fig. 3 A pump shell and diffuser pipe connection cross-sectional structure schematic diagram of the utility model is provided.

[0018] In the drawings:

[0019] 1, pump body support; 2, bearing seat; 3, connecting bracket; 4, pump shell; 5, pump shaft; 6, impeller; 7, rear end cover plate; 8, balance ring; 9, balance hole; 10, connecting pipe; 11, support ring pipe; 12, balance pipe; 13, micro-perforated plate; 14, plate hole; 15, air layer; 16, sound-absorbing cotton layer; 17, suction connection pipe; 18, suction chamber; 19, sealing ring layer; 20, diffuser. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0021] The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0022] The standard parts used in the utility model can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings. The specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the existing technology. The machinery, parts and equipment adopt the conventional models in the existing technology, and the circuit connection adopts the conventional connection mode in the existing technology, which will not be described in detail here.

[0023] Embodiment:

[0024] Referring to Figs. 1-3 A high-efficiency and low-noise self-balancing multistage centrifugal water pump, comprising a pump body support 1, a bearing seat 2 is fixedly connected to the top of the pump body support 1, a pump shell 4 is fixedly connected to one side of the bearing seat 2 through a connecting bracket 3, a pump shaft 5 is arranged on one side of the bearing seat 2, and the end of the pump shaft 5 penetrates through the bearing seat 2 and extends into the interior of the pump shell 4 and is connected with an impeller 6;

[0025] One side of the impeller 6 is provided with a rear end cover plate 7, the rear end cover plate 7 is fixedly connected with a balance ring 8 on one side, a plurality of balance holes 9 are formed in the inner wall of the balance ring 8, and a connecting pipe 10 is connected in the balance holes 9. One end of the connecting pipe 10 is fixedly connected with a support ring pipe 11, the two ends of the connecting pipe 10 are in communication with the balance ring 8 and the support ring pipe 11, and the outer wall of the support ring pipe 11 is fixedly connected with a balance pipe 12.

[0026] The inner wall of the pump shell 4 is fixedly connected with a micro-perforated plate 13, a plurality of plate holes 14 are formed in the micro-perforated plate 13, an air layer 15 is fixedly connected between the micro-perforated plate 13 and the inner wall of the pump shell 4, and the air layer 15 is fixedly connected with a sound-absorbing cotton layer 16 on the side close to the pump shell 4.

[0027] The pump shell 4 is fixedly connected with a suction pipe 17 on the side away from the bearing seat 2, the suction pipe 17 is in communication with the interior of the pump shell 4 and forms a suction chamber 18, and the balance pipe 12 extends into the suction chamber 18 through the suction pipe 17 and forms a flow channel.

[0028] The end of the balance ring 8 is fixedly connected with a sealing ring layer 19.

[0029] The top of the pump shell 4 is fixedly connected with a diffuser pipe 20, which is in communication with the interior of the pump shell 4.

[0030] In this embodiment, when the centrifugal water pump is in operation, the liquid filled in the pump shell 4 is first extruded by the impeller 6, rotates together with the impeller 6, and generates a certain centrifugal force, so that the center of the impeller 6 is thrown out to the periphery, then a low pressure is formed at the center of the impeller 6, and the liquid is sucked from the suction chamber 18 into the impeller 6 by the gas pressure on the liquid surface through the suction pipe 17, at this time, the liquid obtains energy when the impeller 6 rotates, and a high pressure is formed at the outlet of the impeller 6, because the liquid pressures on the front and rear ends of the impeller 6 are different, so an axial force is generated and directed to the suction port of the impeller 6, at this time, the liquid at the rear end cover plate 7 of the impeller 6 flows through the balance ring 8, then flows through the support ring pipe 11 through the balance hole 9 on the balance ring 8 and the connecting pipe 10, then the high-pressure liquid flows out from the support ring pipe 11 and is introduced back into the suction chamber 18 through the balance pipe 12, thereby reducing the pressure difference on both sides of the impeller 6 and balancing the axial force, at the same time, the balance ring 8 cooperates with the rear end cover plate 7 and the pump shell 4 to form a balance cavity, prevents the liquid from leaking in large quantities through the sealing ring layer 19, maintains a certain pressure in the balance cavity, so as to assist the balance hole 9 to more stably balance the axial force, thereby enhancing the balancing effect of the axial force and making the pressure in the balance cavity more stable, and reducing the influence of pressure fluctuation on the balancing effect.

[0031] Further, when the liquid re-enters the suction chamber 18 and flows out from the impeller 6, the pressure and velocity are increased a lot than when entering the impeller 6, and then at the same time, the liquid is gathered together by the volute shape of the pump shell 4, when it runs, the noise sound waves generated are propagated to the micro-perforated plate 13 on the inner wall of the pump shell 4, at this time, the generated sound waves will cause the air column in the perforated hole 14 to vibrate, in the process of air column vibration, friction is generated between the air and the hole wall of the perforated hole 14, so that the sound energy is converted into heat energy and is lost, and at the same time, the air layer 15 after the micro-perforated plate 13 performs resonance sound absorption, so that the sound energy can be further absorbed, in addition, the sound waves passing through the air layer 15 are absorbed by the sound-absorbing cotton layer 16, wideband noise reduction is realized, and then the noise generated when the impeller 6 runs is effectively reduced, and then the liquid gathered by the pump shell 4 is balancedly guided to the diffuser pipe 20, as the flow passage cross section of the diffuser pipe 20 gradually increases, at this time, the liquid flow velocity is reduced, most of the kinetic energy is converted into pressure energy and is discharged through the diffuser pipe 20.

[0032] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0034] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A high efficiency low noise self-balanced multi-stage centrifugal water pump comprising a pump body support (1), characterized in that, The top of the pump body support (1) is fixedly connected with a bearing seat (2), one side of the bearing seat (2) is fixedly connected with a pump shell (4) through a connecting support (3), one side of the bearing seat (2) is provided with a pump shaft (5), the end of the pump shaft (5) penetrates the bearing seat (2) and extends to the inside of the pump shell (4) and is connected with an impeller (6); One side of the impeller (6) is provided with a rear end cover plate (7), one side of the rear end cover plate (7) is fixedly connected with a balance ring (8), a plurality of balance holes (9) are formed in the inner wall of the balance ring (8), a connecting pipe (10) is connected in the balance hole (9), one end of the connecting pipe (10) is fixedly connected with a support ring pipe (11), the two ends of the connecting pipe (10) are in communication with the balance ring (8) and the support ring pipe (11), and the outer wall of the support ring pipe (11) is fixedly connected with a balance pipe (12).

2. A high efficiency low noise self-balancing multi-stage centrifugal water pump according to claim 1, characterized in that, The inner wall of the pump shell (4) is fixedly connected with a micro-perforated plate (13), a plurality of plate holes (14) are formed in the micro-perforated plate (13), and an air layer (15) is fixedly connected between the micro-perforated plate (13) and the inner wall of the pump shell (4). The side of the air layer (15) close to the pump shell (4) is fixedly connected with a sound-absorbing cotton layer (16).

3. The high efficiency low noise self-balancing multi-stage centrifugal water pump according to claim 1, characterized in that, The side, away from the bearing seat (2), of the pump shell (4) is fixedly connected with a suction connecting pipe (17), the suction connecting pipe (17) is in communication with the inside of the pump shell (4) and forms a suction chamber (18), and the end, away from the support ring pipe (11), of the balance pipe (12) penetrates the suction connecting pipe (17) and extends into the suction chamber (18) and forms a flow channel.

4. The high efficiency low noise self-balancing multi-stage centrifugal water pump according to claim 1, characterized in that, The end of the balance ring (8) is fixedly connected with a sealing ring layer (19).

5. The high efficiency low noise self-balancing multi-stage centrifugal water pump according to claim 1, characterized in that, The top of the pump shell (4) is fixedly connected with an expansion pipe (20), and the expansion pipe (20) is in communication with the inside of the pump shell (4).

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