阅读说明：本技术 一种离心泵自吸装置 (Self-priming device of centrifugal pump ) 是由 李辉 周岭 施卫东 陆伟刚 李伟 常浩 潘波 于 2020-07-06 设计创作，主要内容包括：本发明公开了一种离心泵自吸装置,包括自吸装置和离心泵,自吸装置包括进口段、出口段、回水管和喷嘴,进口段呈S管型,进口段上端与进水管路连接,下端与离心泵的进口连接,进口段内部设置有喷嘴,喷嘴的出口指向离心泵的进口,进口段外部设置有连接回水管的接口,出口段呈直管型,出口段位于离心泵上方,其上端与出水管路连接,下端与离心泵的出口连接,出口段外部设置有连接回水管的接口,进口段和出口段通过回水管连通,本发明通过在普通离心泵上增加自吸装置的方式,使普通离心泵具有自吸功能,只需在首次启动前灌泵,安装容易,即开即用,正常运行后,回流阀关闭,由于主泵为离心泵,运行效率高结构简单,易于加工,使用方便。(The invention discloses a self-priming device of a centrifugal pump, which comprises a self-priming device and the centrifugal pump, wherein the self-priming device comprises an inlet section, an outlet section, a water return pipe and a nozzle, the inlet section is of an S-shaped, the upper end of the inlet section is connected with a water inlet pipeline, the lower end of the inlet section is connected with an inlet of the centrifugal pump, the nozzle is arranged in the inlet section, an outlet of the nozzle points to the inlet of the centrifugal pump, a connector connected with the water return pipe is arranged outside the inlet section, the outlet section is of a straight pipe type, the upper end of the outlet section is connected with the water outlet pipeline, the lower end of the outlet section is connected with an outlet of the centrifugal pump, a connector connected with the water return pipe is arranged outside the outlet section, and the inlet section and the outlet section are communicated through the water return pipe. The reflux valve is closed, and the main pump is a centrifugal pump, so that the running efficiency is high, the structure is simple, the processing is easy, and the use is convenient.)

1. A self-priming device of a centrifugal pump comprises the self-priming device and the centrifugal pump, the self-priming device and an interest pump are installed together for use, and is characterized in that,

the self-priming device comprises an inlet section, an outlet section, a water return pipe and a nozzle, wherein the inlet section is of an S-shaped pipe, the upper end of the inlet section is connected with a water inlet pipeline, and the lower end of the inlet section is connected with an inlet of the centrifugal pump; a nozzle is arranged in the inlet section, the outlet of the nozzle points to the inlet of the centrifugal pump, a connector connected with a water return pipe is arranged outside the inlet section,

the centrifugal pump is characterized in that the outlet section is in a straight pipe type, the outlet section is located above the centrifugal pump, the upper end of the outlet section is connected with a water outlet pipeline, the lower end of the outlet section is connected with an outlet of the centrifugal pump, an interface connected with a water return pipe is arranged outside the outlet section, and the inlet section is communicated with the outlet section through the water return pipe.

2. The centrifugal pump self-priming apparatus of claim 1, wherein: and a return valve is arranged on the return pipeline.

3. The centrifugal pump self-priming apparatus of claim 2, wherein: the return valve is in an open state when the pressure difference is less than a critical value, and is in a closed state when the pressure difference is greater than the critical value, and the critical value is between the self-priming height and the lift when the centrifugal pump operates.

4. A centrifugal pump self-priming device according to claim 3, characterized in that: the backflow valve is an elastic backflow valve and comprises a valve clack, a valve seat, a guide rod, a guide frame and a spring.

5. The centrifugal pump self-priming apparatus of claim 4, wherein: the spring is always in a compressed state in the working process, and the opening and closing critical value of the reflux valve is controlled by changing the elastic force of the spring.

6. The centrifugal pump self-priming apparatus of claim 1, wherein: the nozzle is integrally formed with the inlet section.

7. The centrifugal pump self-priming apparatus of claim 1, wherein: the nozzle is detachably connected with the inlet section.

8. A centrifugal pump self-priming device according to claim 6 or 7, characterized in that: the cross section of the nozzle is circular, oval, kidney-shaped or rectangular, and the nozzle opening comprises one or more than one.

9. The centrifugal pump self-priming apparatus of claim 1, wherein: the top of the inlet section is provided with a water filling hole, and the height of the inlet center line of the inlet section is higher than the height of the outlet flange surface of the centrifugal pump or equal to the height of the outlet flange surface of the centrifugal pump.

10. The centrifugal pump self-priming apparatus of claim 1, wherein: the outlet section consists of an inner pipe and an outer shell, a gas-liquid separation chamber is arranged in the area between the inner pipe and the outer shell, a window is formed in the inner pipe, and the area in the inner pipe is communicated with the gas-liquid separation chamber through the window.

Technical Field

The invention relates to the technical field of centrifugal pumps, in particular to a self-priming device of a centrifugal pump.

Background

The common centrifugal pump does not have a self-suction function, and in order to ensure the normal operation of the centrifugal pump, a water inlet pipe and the pump need to be filled with liquid. When the impeller is above the suction level, the following methods are generally used: the pump and the water inlet pipe are filled with liquid before starting at every time, so that the workload is increased, the starting time is prolonged, remote automatic control is not facilitated, and the operation is inconvenient. The bottom valve is arranged at the inlet of the water inlet pipe, but the bottom valve causes great hydraulic loss, and the situation that the liquid leaks due to poor sealing exists. The vacuum pump is adopted to discharge the gas in the water inlet pipe and the pump, and the method has the advantages of high equipment cost, complex operation and large maintenance workload.

The self-priming pump is designed and improved in structure, water is filled into the pump before the self-priming pump is started for the first time, and a water inlet pipe does not need to be filled with water. The pump itself can automatically discharge the gas of the water inlet pipe, thereby entering normal operation. At present, a gas-liquid mixing self-priming pump is mainly adopted and is divided into an internal mixing type and an external mixing type. The working principle is that a certain amount of water is stored in the pump, and after the pump is started, air and water in the water inlet pipeline are fully mixed under the rotating action of the impeller and are discharged to the air-water separation chamber. The gas at the upper part of the gas-water separation chamber is discharged, the liquid at the lower part returns to the impeller and is mixed with the gas of the water inlet pipe until the gas of the pump and the water inlet pipeline is completely discharged, and the self-priming process is completed. The internal mixing type self-sucking pump is divided into an injection device and a non-injection device, wherein the internal mixing type self-sucking pump with the injection device has the advantages of fast water feeding and high suction lift.

Because the gas-liquid separation chamber, the volute chamber, the suction chamber and the reflux device of the gas-liquid mixing self-priming pump are integrally formed, the structure of the pump is complex, the processing difficulty is high, the size is heavy, and the cost is high. In order to realize the functions of gas-water mixing and gas-water separation, the flow channel and the fluid mechanics model of the pump are changed, so that the efficiency of the self-priming pump is far lower than that of the common centrifugal pump.

Disclosure of Invention

The invention aims to solve the problems that a centrifugal pump in the prior art cannot self-suck and the self-sucking pump is low in efficiency.

In order to solve the problems in the prior art, the invention provides a self-priming device of a centrifugal pump, which enables a common centrifugal pump to have a self-priming function, and particularly, the self-priming device of the centrifugal pump comprises the self-priming device and the centrifugal pump, the self-priming device and an interest pump are arranged together for use,

the self-priming device comprises an inlet section, an outlet section, a water return pipe and a nozzle, wherein the inlet section is of an S-shaped pipe, the upper end of the inlet section is connected with a water inlet pipeline, the lower end of the inlet section is connected with an inlet of the centrifugal pump,

a nozzle is arranged in the inlet section, the outlet of the nozzle points to the inlet of the centrifugal pump, a connector connected with a water return pipe is arranged outside the inlet section,

the centrifugal pump is characterized in that the outlet section is in a straight pipe type, the outlet section is located above the centrifugal pump, the upper end of the outlet section is connected with a water outlet pipeline, the lower end of the outlet section is connected with an outlet of the centrifugal pump, an interface connected with a water return pipe is arranged outside the outlet section, and the inlet section is communicated with the outlet section through the water return pipe.

Furthermore, a return valve is arranged on the water return pipeline.

Further, the return valve is in an open state when the pressure difference is less than a critical value, and is in a closed state when the pressure difference is greater than the critical value, and the critical value is between the self-priming height and the lift when the centrifugal pump operates.

Furthermore, the reflux valve is an elastic reflux valve and comprises a valve clack, a valve seat, a guide rod, a guide frame and a spring.

Furthermore, the spring is always in a compressed state in the working process, and the magnitude of the opening and closing critical value of the backflow valve is controlled by changing the magnitude of the elastic force of the spring.

Further, the nozzle is integrally formed with the inlet section.

Further, the nozzle is detachably connected with the inlet section.

Further, the cross section of the nozzle is circular, oval, kidney-shaped or rectangular, and the nozzle opening comprises one or more than one.

Furthermore, the top of the inlet section is provided with a water filling hole, and the height of the inlet center line of the inlet section is higher than or equal to the height of the outlet flange surface of the centrifugal pump.

Further, the outlet section consists of an inner pipe and an outer shell, a gas-liquid separation chamber is arranged in a region between the inner pipe and the outer shell, a window is formed in the inner pipe, and the region in the inner pipe is communicated with the gas-liquid separation chamber through the window.

The invention has the beneficial effects that: (1) the invention provides a self-priming device of a centrifugal pump, which has simple structure and is convenient to process; (2) the centrifugal pump has the advantages that the installation is easy, the centrifugal pump has a self-absorption function when being matched with the centrifugal pump, water is injected into the pump through the S bent pipe only before the pump is started for the first time, the water is not required to be injected every time, and the use is convenient; (3) when the centrifugal pump works normally, the reflux valve is automatically closed under the action of pressure difference, so that the efficiency is high; (4) the nozzles are detachable, and the nozzles with different sizes, different shapes and different quantities can be replaced according to the parameters and the use condition of the centrifugal pump, so that the self-priming time and the self-priming height are changed, and the application range is wide; (5) for the use occasion with the self-priming requirement, the original centrifugal pump does not need to be transformed or replaced, the requirement can be met only by configuring the self-priming device, the configuration is flexible, the inheritance is good, and the resource waste is reduced.

Drawings

FIG. 1 is a schematic view of an embodiment 1 of a self-priming device for a centrifugal pump of the present invention;

FIG. 2 is an enlarged view of a portion of a return valve of embodiment 1 of the self-priming apparatus of the centrifugal pump of the present invention;

FIG. 3 is a perspective view of embodiment 1 of the self-priming device of the centrifugal pump of the present invention;

fig. 4 is a schematic view of a self-priming device embodiment 2 of the centrifugal pump of the present invention.

In the figure: 1-inlet, 2-outlet section, 2.1-inner tube, 2.2-shell, 2.3-window, 2.4-gas-liquid separation chamber, 3-water return pipe, 4-reflux valve, 4.1-valve flap, 4.2-valve seat, 4.3-spring, 4.4-guide rod, 4.5-guide frame, 5-nozzle, 6-irrigation hole plug, 7-impeller, 8-pump body, 9-pump cover, 10-support and 11-motor.

Detailed Description

The invention is further described with reference to the drawings and examples.