CN109322859B

CN109322859B - Centrifugal pump capable of reducing impeller abrasion

Info

Publication number: CN109322859B
Application number: CN201811481948.8A
Authority: CN
Inventors: 何良云; 达云平; 冯军
Original assignee: Sichuan Santai Lida Pump Co ltd
Current assignee: Sichuan Santai Lida Pump Co ltd
Priority date: 2018-12-05
Filing date: 2018-12-05
Publication date: 2021-03-05
Anticipated expiration: 2038-12-05
Also published as: CN109322859A

Abstract

The invention relates to the field of centrifugal pumps, in particular to a centrifugal pump capable of reducing impeller abrasion. The technical scheme is as follows: a centrifugal pump for reducing abrasion of an impeller comprises a motor and a pump body, wherein a water inlet pipe and a water outlet pipe are respectively arranged on the pump body, a pump cavity communicated with the water inlet pipe and the water outlet pipe is arranged in the pump body, the impeller is arranged in the pump cavity, and an output shaft of the motor is connected with the impeller; the water inlet pipe is internally connected with an umbrella-shaped filter screen, the water inlet pipe is provided with a plurality of arc-shaped openings, the arc-shaped openings are positioned on one side of the umbrella-shaped filter screen away from the impeller, the water inlet pipe is sleeved with an annular groove, and the arc-shaped openings are communicated with the annular groove. The invention provides a centrifugal pump which can fully block impurities at a water inlet pipe and reduce the abrasion of the impurities to an impeller, and solves the problem that the conventional centrifugal pump is easily excessively abraded by the impurities.

Description

Centrifugal pump capable of reducing impeller abrasion

Technical Field

The invention relates to the field of centrifugal pumps, in particular to a centrifugal pump capable of reducing impeller abrasion.

Background

Centrifugal pumps operate by causing water to move centrifugally as a result of the rotation of an impeller. Before the water pump is started, the pump shell and the water suction pipe are filled with water, then the motor is started, the pump shaft drives the impeller and the water to rotate at a high speed, the water is thrown to the outer edge of the impeller to be thrown into a water pressure pipeline of the water pump through a flow channel of the volute-shaped pump shell.

The basic structure of the centrifugal pump is composed of six parts, namely an impeller, a pump body, a pump shaft, a bearing, a sealing ring and a stuffing box. 1. The impeller is the core part of the centrifugal pump, the rotating speed of the impeller is higher than the output force, the blades on the impeller play a main role, and the impeller passes through a static balance experiment before assembly. The inner and outer surfaces on the impeller need to be smooth to reduce frictional losses from the water flow. 2. The pump body is also called pump shell, and is the main body of the water pump. The supporting and fixing function is realized, and the supporting and fixing device is connected with a bracket for mounting the bearing. 3. The pump shaft is connected with the motor through a coupling to transmit the torque of the motor to the impeller, so that the pump shaft is a main component for transmitting mechanical energy. 4. The sliding bearing uses transparent oil as lubricant and is added to the oil level line. Too much oil will seep out along the pump shaft, and too few bearings will burn out due to overheating, which causes accidents. The temperature of the bearing is up to 85 degrees in the running process of the water pump, and the bearing generally runs at about 60 degrees. 5. The sealing ring is also called leakage reducing ring. 6. The stuffing box mainly comprises stuffing, a water seal ring, a stuffing cylinder, a stuffing gland and a water seal pipe. The stuffing box mainly has the function of sealing a gap between the pump shell and the pump shaft, so that water in the pump is prevented from flowing to the outside and air outside is prevented from entering the pump. The vacuum in the pump is maintained all the time. When the pump shaft rubs with the packing to generate heat, the water is blocked by the water sealing pipe to the water sealing ring so as to cool the packing. And keeping the normal operation of the water pump. The inspection of the stuffing box during the operational cycle inspection of the water pump is of particular interest. The packing is replaced after about 600 hours of operation.

A utility model patent with patent application number cn201220472021.x discloses a horizontal centrifugal pump arrangement structure, which comprises a base, a centrifugal pump base, a motor, a centrifugal pump, a water inlet pipe and a water outlet pipe; the centrifugal pump base is arranged on the base; the motor and the centrifugal pump are arranged on the centrifugal pump base, and an output shaft of the motor is connected with a pump shaft of the centrifugal pump; the axial direction of a water inlet of the centrifugal pump is the same as the axial direction of the pump shaft, and the axial direction of a water outlet of the centrifugal pump is vertical to the axial direction of the pump shaft; the water inlet pipe and the water outlet pipe are respectively connected with the water inlet and the water outlet of the centrifugal pump; a vibration isolator is connected between the base and the centrifugal pump base; the vibration isolator comprises a top plate and a bottom plate, the top plate is connected with the centrifugal pump base, and the bottom plate is connected with the base; an elastic body is connected between the top plate and the bottom plate, and the elastic direction of the elastic body is vertical to the plane of the bottom plate; the left side and the right side of the bottom plate are both provided with limiting plates; the top plate is positioned in the space between the two limiting plates. The utility model discloses a simple structure has revised the phenomenon that the centrifugal pump takes place horizontal displacement to reduce the centrifugal pump and take place vibration and produce the noise.

However, after the centrifugal pump is installed, water containing impurities directly reaches the impeller from the water inlet pipe, and the impurities can cause abrasion to the impeller. When the centrifugal pump works, the impeller rotates at a high speed, silt or other impurities in water can scratch the surface of the impeller, and the impeller is damaged prematurely. When the impurities contained in the water are excessive, the working capacity of the impeller is also influenced, and the conveying capacity of the centrifugal pump is reduced.

Disclosure of Invention

The centrifugal pump overcomes the defects of the prior art, fully blocks impurities at the water inlet pipe, reduces the abrasion of the impurities to the impeller, and solves the problem that the conventional centrifugal pump is easily excessively abraded by the impurities.

In order to solve the technical problems, the invention adopts the following technical scheme:

a centrifugal pump for reducing abrasion of an impeller comprises a motor and a pump body, wherein a water inlet pipe and a water outlet pipe are respectively arranged on the pump body, a pump cavity communicated with the water inlet pipe and the water outlet pipe is arranged in the pump body, the impeller is arranged in the pump cavity, and an output shaft of the motor is connected with the impeller; the water inlet pipe is internally connected with an umbrella-shaped filter screen, the water inlet pipe is provided with a plurality of arc-shaped openings, the arc-shaped openings are positioned on one side of the umbrella-shaped filter screen away from the impeller, the water inlet pipe is sleeved with an annular groove, and the arc-shaped openings are communicated with the annular groove.

As the preferred scheme of the invention, the annular groove is connected with a slag collecting cylinder through a screw, and is provided with a slag discharge port which is communicated with the slag collecting cylinder; the slag discharge port is positioned at one section of the annular groove far away from the arc-shaped port.

As a preferable scheme of the invention, the slag collecting barrel comprises a connecting flange and a barrel body, the connecting flange and the barrel body are fixed, the connecting flange is connected to the annular groove through a screw, and a sealing gasket is arranged between the connecting flange and the annular groove.

As a preferred scheme of the invention, two spiral guide plates are arranged in the annular groove, the two spiral guide plates are sleeved on the water inlet pipe and are spliced, one end of each spiral guide plate is positioned at the arc-shaped opening, and the other end of each spiral guide plate is positioned at the slag discharge opening.

In a preferred embodiment of the present invention, the cone angle of the umbrella-shaped filter net is 60 ° to 120 °.

Compared with the prior art, the invention has the beneficial effects that:

1. after water containing impurities enters the water inlet pipe, the umbrella-shaped filter screen in the water inlet pipe can effectively block the impurities. Impurities can slide to the arc-shaped opening along the inclined surface of the umbrella-shaped filter screen and flow into the annular groove from the arc-shaped opening. Therefore, the umbrella-shaped filter screen is always kept clean, and impurities are prevented from blocking the umbrella-shaped filter screen. Impurities are collected by the annular groove in time, and the impurities are prevented from being mixed into water again. The water filtered by the umbrella-shaped filter screen is relatively clean, when clean water enters the pump cavity, the abrasion of impurities on the impeller is less, the service life of the impeller is effectively prolonged, and the impeller keeps high conveying capacity.

2. The impurity in the ring channel can flow into a slag collecting barrel from the slag discharging port, and after certain impurities are collected in the slag collecting barrel conveniently, the slag collecting barrel is replaced without disassembling and assembling the ring channel, so that the operation is convenient.

3. When the slag collecting barrel needs to be replaced, the screw between the connecting flange of the slag collecting barrel and the annular groove is unscrewed, and the slag collecting barrel is convenient to disassemble and assemble. Seal gasket can seal the clearance between flange and the ring channel, avoids the condition that moisture or impurity reveal.

4. The spiral guide plate can drain impurities to the slag discharging port from the arc-shaped port, ensures that the impurities completely flow to the slag discharging port, and improves the collection rate of the impurities.

5. The cone angle of the umbrella-shaped filter screen is 60-120 degrees, so that impurities can smoothly slide to the arc-shaped opening when reaching the surface of the umbrella-shaped filter screen, and the situation that the impurities are attached to the surface of the umbrella-shaped filter screen is avoided.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a partial block diagram of the present invention;

FIG. 3 is a schematic view of the configuration of the annular groove and spiral baffle;

figure 4 is a cross-sectional view of the inlet pipe.

In the figure, 1-motor, 2-pump body, 3-water inlet pipe, 4-water outlet pipe, 5-impeller, 6-umbrella-shaped filter screen, 7-annular groove, 8-slag collecting cylinder, 9-spiral guide plate, 21-pump cavity, 31-arc-shaped opening, 71-slag discharging opening, 81-connecting flange, 82-cylinder body and 83-sealing gasket.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example one

A centrifugal pump for reducing impeller abrasion comprises a motor 1 and a pump body 2, wherein a water inlet pipe 3 and a water outlet pipe 4 are respectively arranged on the pump body 2, a pump cavity 21 communicated with the water inlet pipe 3 and the water outlet pipe 4 is arranged in the pump body 2, an impeller 5 is arranged in the pump cavity 21, and an output shaft of the motor 1 is connected with the impeller 5; the utility model discloses a fan, including inlet tube 3, inlet tube 3 is connected with umbelliform filter screen 6, is provided with a plurality of arc mouth 31 on the inlet tube 3, and arc mouth 31 is located umbelliform filter screen 6 and keeps away from one side of impeller 5, and the cover is equipped with ring channel 7 on the inlet tube 3, and a plurality of arc mouths 31 all communicate with ring channel 7.

According to the invention, after water containing impurities enters the water inlet pipe 3, the umbrella-shaped filter screen 6 in the water inlet pipe 3 can effectively block the impurities. The impurities slide along the inclined surface of the umbrella-shaped filter screen 6 to the arc-shaped opening 31 and flow into the annular groove 7 from the arc-shaped opening 31. Therefore, the umbrella-shaped filter screen 6 is always kept clean, and the umbrella-shaped filter screen 6 is prevented from being blocked by impurities. The impurities are collected in time by the annular groove 7, so that the impurities are prevented from being mixed into the water again. The water filtered by the umbrella-shaped filter screen 6 is cleaner, and when clean water enters the pump cavity 21, the impeller 5 is less abraded by impurities, so that the service life of the impeller 5 is effectively prolonged, and the impeller 5 keeps higher conveying capacity.

Example two

On the basis of the first embodiment, the annular groove 7 is connected with the slag collecting barrel 8 through a screw, the annular groove 7 is provided with a slag discharge port 71, and the slag discharge port 71 is communicated with the slag collecting barrel 8; the slag discharge port 71 is positioned at a section of the annular groove 7 far away from the arc-shaped port 31.

Impurities in the annular groove 7 can flow into the slag collecting barrel 8 from the slag discharge port 71, the slag collecting barrel 8 is convenient to replace after certain impurities are collected in the slag collecting barrel 8, the annular groove 7 does not need to be disassembled and assembled, and operation is convenient.

EXAMPLE III

On the basis of the first embodiment or the second embodiment, the slag collecting barrel 8 comprises a connecting flange 81 and a barrel 82, the connecting flange 81 and the barrel 82 are fixed, the connecting flange 81 is connected to the annular groove 7 through screws, and a sealing gasket 83 is arranged between the connecting flange 81 and the annular groove 7.

When the slag collecting barrel 8 needs to be replaced, the screw between the connecting flange 81 of the slag collecting barrel 8 and the annular groove 7 is unscrewed, and the assembly and disassembly are convenient. The gasket seal 83 seals the gap between the flange 81 and the annular groove 7, and prevents leakage of moisture or impurities.

Example four

On the basis of any one of the above embodiments, two spiral guide plates 9 are arranged in the annular groove 7, the two spiral guide plates 9 are sleeved on the water inlet pipe 3, the two spiral guide plates 9 are spliced, one end of each spiral guide plate 9 is located at the arc-shaped opening 31, and the other end of each spiral guide plate 9 is located at the slag discharge opening 71.

Spiral guide plate 9 can be with impurity from arc mouth 31 drainage to row's cinder notch 71, guarantees that impurity flows to row's cinder notch 71 completely, improves the collection rate of impurity.

EXAMPLE five

On the basis of any one of the above embodiments, the cone angle of the umbrella-shaped filter screen 6 is 60 to 120 degrees.

The cone angle of the umbrella-shaped filter screen 6 is 60 degrees to 120 degrees, so that impurities can smoothly slide to the arc-shaped opening 31 when reaching the surface of the umbrella-shaped filter screen 6, and the situation that the impurities are attached to the surface of the umbrella-shaped filter screen 6 is avoided.

Claims

1. A centrifugal pump for reducing impeller abrasion comprises a motor (1) and a pump body (2), wherein a water inlet pipe (3) and a water outlet pipe (4) are respectively arranged on the pump body (2), a pump cavity (21) communicated with the water inlet pipe (3) and the water outlet pipe (4) is arranged in the pump body (2), an impeller (5) is arranged in the pump cavity (21), and an output shaft of the motor (1) is connected with the impeller (5); the device is characterized in that an umbrella-shaped filter screen (6) is connected in the water inlet pipe (3), a plurality of arc-shaped openings (31) are formed in the water inlet pipe (3), the arc-shaped openings (31) are positioned on one side, away from the impeller (5), of the umbrella-shaped filter screen (6), an annular groove (7) is sleeved on the water inlet pipe (3), the arc-shaped openings (31) are all communicated with the annular groove (7), the annular groove (7) is connected with a slag collecting barrel (8) through screws, a slag discharge opening (71) is formed in the annular groove (7), and the slag discharge opening (71) is communicated with the slag collecting barrel (8); arrange slag notch (71) and be located ring channel (7) and keep away from one section of arc mouth (31), be provided with two spiral guide plate (9) in ring channel (7), two spiral guide plate (9) cover are established on inlet tube (3), and two spiral guide plate (9) splices, and spiral guide plate (9) one end is located arc mouth (31) department, and the other end of spiral guide plate (9) is located row slag notch (71) department.

2. A centrifugal pump with reduced impeller wear according to claim 1, characterized in that the slag collection barrel (8) comprises a connecting flange (81) and a barrel (82), the connecting flange (81) and the barrel (82) are fixed, the connecting flange (81) is connected to the annular groove (7) by screws, and a sealing gasket (83) is arranged between the connecting flange (81) and the annular groove (7).

3. A centrifugal pump with reduced impeller wear according to any one of claims 1 to 2, characterized in that the angle of taper of the umbrella-shaped filter screen (6) is 60 ° to 120 °.