CN212563664U - Self-priming device of centrifugal pump - Google Patents
Self-priming device of centrifugal pump Download PDFInfo
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- CN212563664U CN212563664U CN202021292151.6U CN202021292151U CN212563664U CN 212563664 U CN212563664 U CN 212563664U CN 202021292151 U CN202021292151 U CN 202021292151U CN 212563664 U CN212563664 U CN 212563664U
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Abstract
The utility model 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 the inlet of the centrifugal pump, the nozzle is arranged in the inlet section, the outlet of the nozzle points to the inlet of the centrifugal pump, the interface 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 a water outlet pipeline, the lower end of the outlet section is connected with the outlet of the centrifugal pump, the interface 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. After normal operation, the return valve is closed, and because the main pump is the centrifugal pump, the high simple structure of operating efficiency.
Description
Technical Field
The utility model relates to a centrifugal pump technical field, especially a centrifugal pump is from inhaling device.
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.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that the centrifugal pump can not be self-priming and the self-priming pump is low in efficiency in the prior art.
In order to solve the problems in the prior art, the utility model provides a self-priming device of a centrifugal pump, which enables a common centrifugal pump to have a self-priming function, in particular, the self-priming device of the centrifugal pump comprises a self-priming device and a 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 utility model has the advantages that: (1) the utility model provides a self-priming device of a centrifugal pump, which has simple structure and is convenient for processing; (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 of a centrifugal pump according to 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 the self-priming device of the centrifugal pump of embodiment 1 of the present invention;
fig. 4 is a schematic view of embodiment 2 of the self-priming device 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 explained by the following figures and examples.
Example 1: as shown in fig. 1 and fig. 2, the centrifugal pump of the present invention includes a self-priming device and a centrifugal pump, wherein the self-priming device and the centrifugal pump are separated and need to be installed together for use, and the self-priming device includes an inlet section 1, an outlet section 2, a water return pipe 3 and a nozzle 5.
The inlet section 1 is of an S-shaped pipe type, the upper end of the inlet section 1 is connected with a water inlet pipeline, and the lower end of the inlet section 1 is connected with an inlet of a centrifugal pump. The centrifugal pump is characterized in that a nozzle 5 is arranged inside the inlet section 1, an outlet of the nozzle 5 points to an inlet of the centrifugal pump, and a connector connected with the water return pipe 3 is arranged outside the inlet section 1.
The outlet section 2 is in a straight pipe shape, the outlet section 2 is located above the centrifugal pump, the upper end of the outlet section 2 is connected with a water outlet pipeline, the lower end of the outlet section 2 is connected with an outlet of the centrifugal pump, and an interface connected with a water return pipe 3 is arranged outside the outlet section 2. The inlet section 1 and the outlet section 2 are communicated through the water return pipe 3.
The centrifugal pump mainly comprises an impeller 7, a pump body 8, a pump cover 9, a support 10 and a motor 11.
Further, a return valve 4 is further installed on the return pipe 3, and the return valve 4 is in an open state when the pressure difference is smaller than 15m and is in a closed state when the pressure difference is larger than 15 m. The lift of the working interval of the centrifugal pump is more than 30 m.
The backflow valve 4 is an elastic backflow valve, and specifically, as shown in fig. 2, the backflow valve 4 comprises a valve clack 4.1, a valve seat 4.2, a guide rod 4.4, a guide frame 4.5 and a spring 4.3.
The spring 4.3 is always in a compressed state during operation, and the spring pressure is 33N when the return valve 4 is closed.
The nozzle 5 is formed integrally with the inlet section 1, the nozzle 5 not being removable. The cross section of the nozzle is circular, and only one nozzle opening is provided.
The top of the inlet section 1 is provided with a water filling hole, and a plug 6 is arranged on the water filling hole. The height of the central line of the inlet section 1 is higher than that of the flange surface of the outlet of the centrifugal pump.
The outlet section 2 consists of an inner tube 2.1 and an outer shell 2.2, a gas-liquid separation chamber 2.4 is arranged in the area between the inner tube 2.1 and the outer shell 2.2, and a window 2.3 is arranged on the inner tube 2.1, so that the area in the inner tube 2.1 is communicated with the gas-liquid separation chamber 2.4.
Example 2: as shown in fig. 3, the self-priming device of the centrifugal pump of the present invention comprises a self-priming device and a centrifugal pump, wherein the self-priming device and the centrifugal pump are separated and need to be installed together for use,
wherein, the self-priming device comprises an inlet section 1, an outlet section 2, a water return pipe 3 and a nozzle 5.
The inlet section 1 is of an S-shaped pipe type, the upper end of the inlet section 1 is connected with a water inlet pipeline, and the lower end of the inlet section 1 is connected with an inlet of a centrifugal pump. The centrifugal pump is characterized in that a nozzle 5 is arranged inside the inlet section 1, an outlet of the nozzle 5 points to an inlet of the centrifugal pump, and a connector connected with the water return pipe 3 is arranged outside the inlet section 1.
The outlet section 2 is in a straight pipe shape, the outlet section 2 is located above the centrifugal pump, the upper end of the outlet section 2 is connected with a water outlet pipeline, the lower end of the outlet section 2 is connected with an outlet of the centrifugal pump, and an interface connected with a water return pipe 3 is arranged outside the outlet section 2. The inlet section 1 and the outlet section 2 are communicated through the water return pipe 3.
The centrifugal pump mainly comprises an impeller 7, a pump body 8, a pump cover 9, a support 10 and a motor 11.
A return valve 4 is also installed on the return pipe 3. The return valve 4 is in an open state when the differential pressure is less than 20m and in a closed state when the differential pressure is greater than 20 m. The lift of the working interval of the centrifugal pump is more than 30 m.
The reflux valve 4 is an elastic reflux valve and mainly comprises a valve clack 4.1, a valve seat 4.2, a guide rod 4.4, a guide frame 4.5 and a spring 4.3.
The spring 4.3 is in a compressed state all the time during operation. The spring pressure when the return valve 4 is closed is 44N.
The nozzle 5 is a separate component from the inducer 1, the nozzle 5 being removable. The section of the nozzle is circular, and two nozzle openings are provided.
The top of the inlet section 1 is provided with a water filling hole, and a plug 6 is arranged on the water filling hole. The height of the central line of the inlet section 1 is higher than that of the flange surface of the outlet of the centrifugal pump.
The outlet section 2 consists of an inner tube 2.1 and an outer shell 2.2, a gas-liquid separation chamber 2.4 is arranged in the area between the inner tube 2.1 and the outer shell 2.2, and a window 2.3 is arranged on the inner tube 2.1, so that the area in the inner tube 2.1 is communicated with the gas-liquid separation chamber 2.4.
The utility model discloses a centrifugal pump is from inhaling device's theory of operation: before the pump is started, water is filled into the pump through the water filling holes on the inlet section 1 until the liquid level reaches the inlet of the inlet section 1. After the pump is started, the impeller 7 rotates at a high speed, the inlet of the impeller forms negative pressure, the outlet of the impeller, which is connected with the inlet pipe 1 and the nozzle 5, is in a vacuum state, air in the inlet pipe is sucked into the inlet section 1, is mixed with water stored in the inlet section 1, enters the impeller 7, and is discharged into the outlet section 2 through the pump body 8. The gas-liquid mixture in the inner pipe 2.1 of the outlet section enters the gas-liquid separation chamber 2.4 through the window 2.3, the sectional area of the gas-liquid separation chamber is increased, the flow rate is reduced, gas-liquid separation is realized by utilizing the difference of gas and liquid density, and the gas is discharged from the outlet of the outlet section 2 upwards. The liquid is left at the lower part of the gas-liquid separation chamber and reaches the nozzle 5 through the return pipe 3 and the return valve 4 under the action of pressure difference to form high-speed jet flow, and the high-speed jet flow carries the gas in the inlet section 1 and returns to the impeller again. Repeating the steps until all the air in the pump and the inlet pipeline is exhausted, and finishing self-suction.
In the self-priming process, the pressure difference between the two ends of the reflux valve 4 is small, and the reflux valve 4 is in an opening state. During normal operation, the pressure of the gas-liquid separation chamber 2.4 is increased, the pressure difference between two ends of the reflux valve 4 is increased, the reflux valve 4 is closed, the volume loss is reduced, and the efficiency of the pump is improved. The nozzle in the embodiment 2 can be detached, and the nozzles with different sizes, different shapes and different quantities can be replaced according to the parameters and the use conditions of the centrifugal pump, so that the self-priming time and the self-priming height are changed, the application range of the self-priming device is expanded, and different requirements are met.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (8)
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 backflow valve is an elastic backflow valve and comprises a valve clack, a valve seat, a guide rod, a guide frame and a spring.
4. The centrifugal pump self-priming apparatus of claim 1, wherein: the nozzle is integrally formed with the inlet section.
5. The centrifugal pump self-priming apparatus of claim 1, wherein: the nozzle is detachably connected with the inlet section.
6. A centrifugal pump self-priming device according to claim 4 or 5, 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.
7. 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.
8. 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021292151.6U CN212563664U (en) | 2020-07-06 | 2020-07-06 | Self-priming device of centrifugal pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021292151.6U CN212563664U (en) | 2020-07-06 | 2020-07-06 | Self-priming device of centrifugal pump |
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| CN212563664U true CN212563664U (en) | 2021-02-19 |
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| CN202021292151.6U Active CN212563664U (en) | 2020-07-06 | 2020-07-06 | Self-priming device of centrifugal pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111664097A (en) * | 2020-07-06 | 2020-09-15 | 江苏大学镇江流体工程装备技术研究院 | Self-priming device of centrifugal pump |
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- 2020-07-06 CN CN202021292151.6U patent/CN212563664U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111664097A (en) * | 2020-07-06 | 2020-09-15 | 江苏大学镇江流体工程装备技术研究院 | Self-priming device of centrifugal pump |
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