CN103925222A - Self-priming non-clogging sewage pump - Google Patents

Abstract

A self-priming non-clogging sewage pump, including a pump body, a rotating shaft, an impeller, a pump cover and a suspension. It is connected with the left side of the volute, the suspension is fixed at the left end of the pump body, one end of the rotating shaft is connected with the impeller, the other end runs through the pump cover, the oil chamber and the suspension and is connected with the bearing at the left end of the suspension, the impeller is set inside the volute, and the front The cover plate is fixed on the inner wall of the volute by bolts, and the right side of the lower end of the volute is provided with a return hole, which communicates with the liquid storage chamber through a one-way water inlet valve, and the outlet at the upper end of the volute is arranged in the gas-liquid separation chamber. The structure is simple, the manufacturing cost is low, and it is easy to popularize. It can effectively avoid clogging, reduce maintenance and repair costs, and improve service life. The invention has strong self-priming ability, shortens self-priming time, and improves work efficiency.

Description

Self-priming non-clogging sewage pump

technical field

The invention relates to a sewage pump, in particular to a self-priming non-clogging sewage pump.

Background technique

Sewage pumps are widely used in municipal, coal mines, power plants, urban water supply and drainage, environmental protection, sewage treatment, chemical, mining, petroleum, water conservancy, metallurgy and other industries to transport liquids containing suspended solid particles or fibrous suspended solids. It is one of the major energy consumers and key equipment in various industries.

At present, the sewage pumps produced in China generally have low efficiency, high energy consumption, serious clogging, poor self-priming performance, and multi-stage lifting pump stations are often used for occasions that require a large elevation increase, resulting in large project investment. Common self-priming sewage The self-priming performance of the pump is relatively dependent on the gap between the tongues. When the gap between the tongues is greater than 2mm, it cannot self-prime. If the gap between the tongues is too small, it is easy to be blocked, which greatly restricts the further application of the sewage pump.

Contents of the invention

Aiming at the defects in the prior art, the invention provides a self-priming non-clogging sewage pump with strong self-priming ability, high working efficiency and effective prevention of clogging.

The specific technical solution is: a self-priming non-clogging sewage pump, including a pump body, a shaft, an impeller, a pump cover and a suspension. The pump body includes an oil chamber, a volute, a gas-liquid separation chamber, an inlet pipe, a liquid storage chamber and Cover plate, the pump cover is connected with the left side of the volute, the suspension is fixed at the left end of the pump body, one end of the rotating shaft is connected with the impeller, and the other end runs through the pump cover, the oil chamber and the suspension and is connected with the bearing at the left end of the suspension. Inside the volute, the front cover plate is fixed on the inner wall of the volute by bolts. There is a return hole on the right side of the lower end of the volute. The return hole communicates with the liquid storage chamber through a one-way water inlet valve. In the separation chamber, the upper end of the gas-liquid separation chamber is provided with a vertically upward water outlet. The water outlet is arranged along the direction of the central axis of the impeller and facing the impeller, and the water spray pipe is provided with a control valve.

The impeller includes back blades, blades and a rear cover, the rear cover is connected to the shaft through a key, two blades are arranged on the inner side of the rear cover, and a cutting groove matched with the blades is arranged on the inner side of the front cover.

The wrapping angle α of the blade is greater than 270°, and the blade is a twisted blade with a helix at the head.

The inclination angle a of the outlet of the volute relative to the horizontal plane is 10°.

The connection between the rotating shaft and the oil chamber is provided with a mechanical sealing device.

The gap b at the tongue of the volute is 40% of the diameter of the water outlet.

The invention is simple in structure, low in manufacturing cost, easy to popularize, can effectively avoid clogging, reduces maintenance and repair costs, and improves service life; the invention has strong self-priming ability, shortens self-priming time, and improves work efficiency.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of the structure of the pump body;

Fig. 3 is the structural representation of impeller of the present invention;

Fig. 4 is a schematic diagram of the structure of the front cover plate of the present invention;

Fig. 5 is the left view of Fig. 4;

Fig. 6 is a hydraulic diagram of the impeller of the present invention.

Detailed ways

As shown in Figures 1 and 2, a self-priming non-clogging sewage pump includes a pump body 1, a rotating shaft 2, an impeller 5, a pump cover 22 and a suspension 23. The pump body 1 includes an oil chamber 3, a volute 4, an air The liquid separation chamber 6, the water inlet pipe 7, the liquid storage chamber 8 and the front cover plate 16, the pump cover 22 is arranged on the left side of the volute 4, the suspension 23 is fixed on the left end of the pump body 1, one end of the rotating shaft 2 is connected with the impeller 5, and the other One end runs through the pump cover 22, the oil chamber 3 and the suspension 23 and is connected to the bearing 9 at the left end of the suspension 23. The impeller 5 is arranged inside the volute 4, and a backflow hole 10 is provided on the right side of the lower end of the volute 4, and the backflow hole 10 passes through The one-way water inlet valve 11 communicates with the liquid storage chamber 8, the outlet 12 at the upper end of the volute 4 is arranged in the gas-liquid separation chamber 6, the upper end of the gas-liquid separation chamber 6 is provided with a vertically upward water outlet 13, and one end of the water inlet pipe 7 is connected to the The water inlet of the volute 4 is connected, and the liquid storage chamber 8 is provided with a water spray pipe 14, one end of the water spray pipe 14 is inside the water inlet pipe, and the water outlet of the water spray pipe 14 is along the direction of the central axis of the impeller 5 and facing the impeller 5, and the water spray pipe 14 is provided with a control valve 15 . The impeller 5 includes back blades 21, blades 19 and a rear cover 17, and the front cover 16 is fixed on the inner wall of the volute 4 by bolts.

The water inlet pipe 7 of the present invention is connected with the external sewage pipe. When the present invention is started, there is air in the water inlet pipe 7, and the rotation of the rotating shaft 2 drives the impeller 5 to rotate. Negative pressure is generated by the rotation of the impeller 5, and the air in the water inlet pipe 7 It will enter the impeller 5 due to the pressure difference, and at the same time the control valve 15 is opened, the water spray pipe 14 sprays the liquid in the liquid storage chamber 8 into the impeller 5, and the gas and liquid are mixed through the rotation of the impeller 5, so that the impeller 5 inlet produces The greater negative pressure avoids the dependence of the self-priming performance of the common self-priming sewage pump on the gap between the tongues, and at the same time shortens the self-priming time. The gas-liquid mixture enters the volute 4 from the impeller 5, and then passes through the The outlet 12 enters the gas-liquid separation chamber 6, in which the liquid and air are separated by their own gravity difference, the gas will be discharged through the water outlet 13, and the liquid will flow back into the volute 4, and pass through the return hole 10 and the unit Enter the liquid storage chamber 8 to the water inlet valve 11, and circulate like this until the air in the water inlet pipe 7 is exhausted. At this time, all that enters the impeller 5 is liquid, the control valve 15 is closed, and the water spray pipe 14 stops spraying water. The eddy current between the flow channels inside the pump is reduced, the eddy current loss in the flow is reduced, and the efficiency of the pump is effectively improved. Through the continuous high-speed rotation of the impeller 5, the sewage entering the water inlet pipe 7 will flow out through the water outlet 13.

As shown in Figure 3, Figure 4 and Figure 5, the front cover 16 is provided with a cutting groove 18, and the rear cover 17 is provided with a blade 19, through the cooperation between the cutting groove 18 and the high-speed rotating blade 19, the sewage The long fibers in the pump are cut into short fibers to prevent clogging. As shown in Figure 6, the wrapping angle α of the blade 19 is greater than 270°. shift. The outlet 12 of the volute 4 has an inclination angle a of 10° relative to the horizontal plane, which avoids excessive impact between the liquid flowing out of the volute 4 and the pump body, resulting in kinetic energy loss, and improves work efficiency. The connection between the rotating shaft 2 and the oil chamber 3 is equipped with a mechanical sealing device 20, which improves the sealing reliability, prevents oil leakage, and improves the service life of the present invention.

Claims (6)

1. A self-priming non-clogging sewage pump is characterized in that: it includes a pump body, a rotating shaft, an impeller, a pump cover and a suspension, and the pump body includes an oil chamber, a volute, a gas-liquid separation chamber, a water inlet pipe, a liquid storage chamber and The front cover, the pump cover is connected with the left side of the volute, the suspension is fixed at the left end of the pump body, one end of the rotating shaft is connected with the impeller, the other end runs through the pump cover, the oil chamber and the suspension and is connected with the bearing at the left end of the suspension, the impeller is set Inside the volute, the front cover plate is fixed on the inner wall of the volute by bolts. There is a return hole on the right side of the lower end of the volute. The return hole communicates with the liquid storage chamber through a one-way water inlet valve. In the liquid separation chamber, the upper end of the gas-liquid separation chamber is provided with a vertically upward water outlet. The water outlet is arranged along the central axis of the impeller and facing the impeller, and the water spray pipe is provided with a control valve. 2. A self-priming non-clogging sewage pump as claimed in claim 1, characterized in that: the impeller includes back blades, blades and a rear cover, the rear cover is connected to the rotating shaft through a key, and the inner side of the rear cover is Two blades are arranged, and a cutting groove matched with the blades is arranged on the inner side of the front cover. 3. A self-priming non-clogging sewage pump according to claim 2, characterized in that: the wrapping angle α of the blade is greater than 270°, and the blade is a twisted blade with a helix at the head. 4. A self-priming non-clogging sewage pump according to claim 1, characterized in that: the inclination angle a of the outlet of the volute relative to the horizontal plane is 10°. 5. A self-priming non-clogging sewage pump as claimed in claim 1, characterized in that mechanical seals are provided at the connection between the rotating shaft and the oil chamber. 6. A self-priming non-clogging sewage pump as claimed in claim 1, characterized in that: the gap b at the partition tongue of the volute is 40% of the diameter of the water outlet.