阅读说明：本技术 一种微小流量、低噪声卧式多级离心泵 (Micro-flow low-noise horizontal multistage centrifugal pump ) 是由 朱乐乐 查振海 仰红良 王艳 赵才甫 赵国忠 陈建国 于 2020-05-22 设计创作，主要内容包括：本发明公开了一种微小流量、低噪声卧式多级离心泵,涉及多级离心泵领域,包括泵体外壳和连接在泵体外壳上的电机；导流器、叶轮、导叶和出水导叶依次套装在电机轴上固定；叶轮共有三级,并采用闭式结构,该叶轮的前后分别盖装叶轮前盖板和叶轮后盖板,叶轮前盖板和叶轮后盖板之间间隔一定距离形成空腔,空腔内均布若干厚度均等的叶片,相邻两叶片间形成狭长的流道。本发明有效解决现有的卧式多级离心泵叶轮在小流量区运转不稳定引起的泵效率下降,同时带来的水力噪声和机械振动问题；解决现有的卧式多级离心泵电机运转时,风扇带来的噪声大的问题；解决现有的卧式多级离心泵外形尺寸偏大,进出口螺纹接头不方便安装外管路的问题。(The invention discloses a micro-flow low-noise horizontal multistage centrifugal pump, which relates to the field of multistage centrifugal pumps and comprises a pump body shell and a motor connected to the pump body shell; the fluid director, the impeller, the guide vane and the water outlet guide vane are sequentially sleeved on the motor shaft and fixed; the impeller has three stages, and adopts a closed structure, the front and the back of the impeller are respectively covered with an impeller front cover plate and an impeller back cover plate, a cavity is formed between the impeller front cover plate and the impeller back cover plate at a certain distance, a plurality of blades with equal thickness are uniformly distributed in the cavity, and a long and narrow flow channel is formed between two adjacent blades. The invention effectively solves the problems of hydraulic noise and mechanical vibration caused by the pump efficiency reduction caused by the unstable operation of the impeller of the existing horizontal multistage centrifugal pump in a small flow area; the problem of large noise caused by a fan when the existing horizontal multi-stage centrifugal pump motor operates is solved; the problem of current horizontal multistage centrifugal pump overall dimension be on the large side, the inconvenient installation outer pipeline of exit screwed joint is solved.)

1. The utility model provides a little flow, low noise horizontal multistage centrifugal pump, includes pump body shell and motor (8) of connection on pump body shell, its characterized in that: the pump body shell is formed by welding a pressure-resistant cylinder (6), an inlet quick connector (1) and an outlet quick connector (5), wherein the inlet quick connector (1) is arranged at an inlet of the pump body shell, and the outlet quick connector (5) is arranged at an outlet of the pump body shell; the shaft of the motor (8) is extended, so that the fluid director (3), the impeller (2), the guide vane (4) and the water outlet guide vane (7) are sequentially sleeved on the motor shaft (11) and fixed; the impeller (2) has three stages, a closed structure is adopted, a front impeller cover plate (2-1) and a rear impeller cover plate (2-2) are respectively covered on the front and the rear of the impeller (2), a certain distance is reserved between the front impeller cover plate (2-1) and the rear impeller cover plate (2-2) to form a cavity, a plurality of blades (2-3) are uniformly distributed in the cavity, the thickness of each blade (2-3) is equal, the blades are gradually widened from an inlet to an outlet of the impeller (2), and a long and narrow flow channel is formed between every two adjacent blades (2-3).

2. The micro-flow, low-noise horizontal multi-stage centrifugal pump of claim 1, wherein: eight blades (2-3) are arranged, and each blade (2-3) is fixed on the front cover plate and the rear cover plate (2-1 and 2-2) of the impeller through welding.

3. The micro-flow, low-noise horizontal multistage centrifugal pump according to claim 1 or 2, characterized in that: the impeller front cover plate (2-1), the impeller rear cover plate (2-2) and the blades (2-3) are all formed by adopting a stamping process.

4. The micro-flow, low-noise horizontal multi-stage centrifugal pump of claim 1, wherein: and the connecting seam of the fluid director (3) and the pressure-resistant cylinder (6), the fluid director (3) and the guide vane (4) and the connecting seam of the guide vane (4) and the water outlet guide vane (7) are sealed by a sealing ring (9).

5. The micro-flow, low-noise horizontal multi-stage centrifugal pump of claim 1, wherein: the motor (8) adopts a self-cooling three-phase asynchronous motor.

6. The micro flow, low noise horizontal multi-stage centrifugal pump according to claim 1 or 5, wherein: the lower end face of the front end cover of the motor (8) is in contact with the upper end face of the base (9) and is fixedly connected through screws.

7. The micro-flow, low-noise horizontal multi-stage centrifugal pump of claim 1, wherein: the inlet quick coupler (1) and the outlet quick coupler (5) are both of clamp type structures with small calibers, and external pipelines can be connected conveniently and quickly.

Technical Field

The invention relates to the field of multistage centrifugal pumps, in particular to a micro-flow low-noise horizontal multistage centrifugal pump.

Background

The horizontal centrifugal pump for a ship is required to be capable of lifting high-purity water to a larger pressure within a specified micro flow range, and meanwhile, air noise generated by the centrifugal pump is required to be not more than 55dB, and strict requirements are provided for the size, the weight, the installation mode and the like of pump equipment. Aiming at the characteristics, the existing horizontal multi-stage centrifugal pump has some technical defects: the rated flow point of the existing pump is large, the pump efficiency can be greatly reduced if the existing pump works in a micro flow area for a long time, and meanwhile, a pump impeller is easy to generate flow separation and vortex during operation, so that a large amount of hydraulic noise and mechanical vibration can be caused; the common three-phase asynchronous motor selected by the existing pump is mainly cooled by a fan, and the generated noise is large; the prior horizontal multistage centrifugal pump has large overall dimension and inconvenient installation of inlet and outlet screwed joints.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a micro-flow low-noise horizontal multi-stage centrifugal pump, which effectively solves the problems of hydraulic noise and mechanical vibration caused by the reduction of pump efficiency due to the unstable operation of the impeller of the existing horizontal multi-stage centrifugal pump in a small-flow area; the problem of large noise caused by a fan when the existing horizontal multi-stage centrifugal pump motor operates is solved; the problem of current horizontal multistage centrifugal pump overall dimension be on the large side, the inconvenient installation outer pipeline of exit screwed joint is solved.

The purpose of the invention is achieved by the following technical scheme: the horizontal multistage centrifugal pump with micro flow and low noise comprises a pump body shell and a motor connected to the pump body shell, wherein the pump body shell is formed by welding a pressure-resistant cylinder with an inlet quick connector and an outlet quick connector, the inlet quick connector is arranged at an inlet of the pump body shell, and the outlet quick connector is arranged at an outlet of the pump body shell; the motor shaft is lengthened, so that the fluid director, the impeller, the guide vane and the water outlet guide vane are sequentially sleeved on the motor shaft and fixed; the impeller has three stages and adopts a closed structure, the front and the back of the impeller are respectively covered with an impeller front cover plate and an impeller back cover plate, a certain distance is arranged between the impeller front cover plate and the impeller back cover plate to form a cavity, a plurality of blades are uniformly distributed in the cavity, the thickness of each blade is uniform, the blade is gradually widened from an impeller inlet to an outlet, and a long and narrow flow channel is formed between every two adjacent blades.

As a further technical scheme, the number of the blades is eight, and each blade is fixed on the front cover plate and the rear cover plate of the impeller through welding.

As a further technical scheme, the impeller front cover plate, the impeller rear cover plate and the blades are all formed by adopting a stamping process.

As a further technical scheme, the connecting seams of the fluid director and the pressure-resistant cylinder, the fluid director and the guide vane and the water outlet guide vane are sealed by sealing rings.

As a further technical scheme, the motor adopts a self-cooling three-phase asynchronous motor.

As a further technical scheme, the lower end face of the front end cover of the motor is in contact with the upper end face of the base and is fixedly connected through screws.

As a further technical scheme, the inlet quick connector and the outlet quick connector both adopt clamp type structures with small calibers, so that the quick connection of external pipelines is facilitated.

The invention has the beneficial effects that:

1. the impeller has the advantages that the number and the thickness of the blades of the impeller are large, the blades of the impeller are gradually widened from the inlet to the outlet of the impeller, a long, narrow and smooth flow channel space is formed, the diffusion degree of the flow channel among the blades is reduced, the generation of flow separation and vortex among the blades is avoided, the noise is low when the impeller operates, the flow guiding effect is good, the impeller is very suitable for occasions with micro flow and high lift, the minimum flow can reach 0.03-0.1 m3/h and the lift can reach 20-24 m through the verification of a water pump trial run test, the pump runs very stably in a micro flow area, the generated vibration noise is extremely low, and the application range is wide;

2. the self-cooling type three-phase asynchronous motor is adopted, the self-cooling material with better heat dissipation performance is adopted, and the fan cover part of the motor are removed, so that the noise of the water pump is further reduced, the space size and the weight of the pump are effectively reduced, and the self-cooling type three-phase asynchronous motor is suitable for the installation requirement in a narrow space;

3. the inlet and outlet of the pump body adopt a clamp type quick coupler, so that an outer pipeline can be conveniently and quickly installed, the caliber is reduced, and the pump is suitable for keeping the flow speed stable under the working condition of small flow.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of a blade.

Fig. 3 is a structural sectional view of the impeller.

Description of reference numerals: 1. an inlet quick coupler; 2. an impeller; 2-1, an impeller front cover plate; 2-2 impeller rear cover plate; 2-3 blades; 3. a fluid director; 4. a guide vane; 5. an outlet quick coupler; 6. a pressure resistant cylinder; 7. water outlet guide vanes; 8. a motor; 9. a seal ring; 10. a base; 11. a motor shaft.

Detailed Description

The invention will be described in detail below with reference to the following drawings: