The pump is mainly used for conveying fluid or mixing fluid, including liquid, gas, gas-liquid mixture, solid liquid mixture and the mechanical equipment of the gas liquid solid mixture. There are many types of pumps, and there are many ways to classify them.

(1) in accordance with the pump equipment installation engineering category, according to the construction engineering classification standard of GB / T 50841 can is divided into: centrifugal pump, vortex pump, electric reciprocating pump, plunger pump, steam reciprocating pump, metering pump, screw pump, gear pump, vacuum pump, shield pump, simple mobile diving pump etc.. The centrifugal pump has the advantages of high efficiency, simple structure and wide application range.

(2) according to the working principle and structure of the pump can be divided into: displacement pump, impeller pump.

1) volume type pump. The movement of the work component causes the working volume to increase and reduce and the suction and discharge materials are increased periodically, and the pressure of the material can be increased directly by the extrusion of the working parts. According to the different motion parts of the movement is divided into two types of reciprocating pump and rotary pump, reciprocating pump piston pumps, piston pumps and diaphragm pumps and so on; rotary pump gear pump, screw pump and vane pump, etc..

2) vane pump. The impeller pump is driven by the impeller to drive the liquid high-speed rotation and the machinery can be transmitted to the conveying of the material. According to the impeller of the pump and the structure characteristics of the flow channel is divided into different impeller centrifugal pump, axial flow pump, mixed flow pump and vortex pump, etc..

(3) according to the position of pump shaft can be divided into: vertical pump, horizontal pump.

(4) according to the number of suction mouth can be divided into: single suction pump, double suction pump.

(5) according to the driving pump of the original motive, can be divided into: electric pump, steam turbine pump, diesel pump, pneumatic diaphragm pumps, etc..

Drainage pumps used in the building are submersible sewage pump, liquid type non clogging sewage pump, vertical sewage pump and horizontal sewage pump and so on. Due to the building site in general smaller, less displacement, the drainage pump can give priority to the use of submersible sewage pump and liquid type non clogging sewage pumps, in which liquid sewage pump generally used in important places; vertical and horizontal sewage pump sewage pump requirements set base isolation, since the irrigation type absorbent, and occupied a certain space, so in the construction of less use of.

Drainage pump flow should be selected according to the design flow of life, when there is a displacement of water, can be selected according to the maximum flow of life. Fire elevator sump pump flow is not less than 10L/s. The head of the drainage pump is determined according to the lifting height and pipeline loss calculation, and then a certain free head is added. Free head should adopt 0.02 ~ 0.03MPa. Drainage pump suction pipe and outlet pipe flow rate of not less than 0.7m/s, and should not be greater than 2.0m/s. The public building should set up a spare pump for the unit in every living drainage pool. Underground room, equipment room, garage floor drain, if there are two or more than two sets of drainage pump can not pump. When the water collecting basin can not be provided with an accident drainage pipe, the water pump should have uninterrupted power supply; when the water inlet pipe can be closed, the uninterrupted power supply can not be provided, but the alarm device should be set up. When the upgrade with a large impurities, dirt and water, different sump in the submersible sewage pump outlet pipe should not discharge the merger; when upgrade their wastewater, according to the actual situation in the different sump of submersible sewage pump outlet pipe combined discharge. Two or more than two shared a water pump outlet pipe, shall be installed at each pump outlet pipe on the valve and check valve. A single pump water intrusion may arise when the valve should be set. Don't allow the pressure of the drainage and construction of gravity drainage pipe combined discharge. When the submersible sewage pump to raise a large debris, the submersible sewage pump should be equipped with a crushing device; when upgrading the sewage containing more fiber, it is appropriate to use a large channel submersible sewage pump. When the submersible sewage pump motor power is greater than or equal to 7.5kW or outlet diameter greater than or equal to DN100, the pump fixed auto plant; when the submersible sewage pump motor power 7.5kw or less than the outlet pipe diameter is less than DN100, set up mobile hose installation. When the sewage sump is drained by submersible sewage pump, the pump should be set up to fix the self coupling device, which is convenient for the maintenance and repair of the pump. Drainage pump should be able to automatically start and stop the scene manually start and stop. Multiple pumps can be run in parallel, can also be put into operation.

Structure and working principle of submersible pump for well

Structure of submersible pump for 1.1 well

Well submersible pumps are used by the pump body, Yang pipe, pump seat, submersible motor (including the cable) and the

Dynamic protection device and other components. The pump body is a working part of the submersible pump, which is composed of a water inlet section, a guide shell, a check valve, a pump shaft and an impeller. There are two ways to fix the shaft of the impeller: 150QJ30,

200QJ80, 250QJ80 and QJC type impeller is taper sleeve is fastened on the pump shaft; other types of impeller with keys and a shaft sleeve is fixed on the pump shaft. Bolt connection between diversion shell

The entire pump body of the 150QJT15 type is fixed with four flat steel bars. Between the pump and the submersible motor with flange bolt connection, two axis is connected with the coupling. Also lifting pipes connected by bolts.

Motor for vertical movement of water filling well submersible three-phase asynchronous motors, with the cable waterproof rubber sheathed cable, starting protection device should be used with overload, undervoltage, broken equal protection function of lotus root decompression starter box.

1.2 well submersible pump working principle

The impeller of the submersible pump driven by the submersible motor rotates to form a vacuum at the inlet of the impeller, the water is sucked in, and the water is generated under the action of the impeller blade to obtain the centrifugal force, thereby obtaining the speed and the pressure energy. With a certain energy of water through the diversion shell, into the next level of the impeller, with the increase of pump series, the pressure is increasing, and finally through the pipe and pump seat into the pipeline system in the ground.

Two, the installation of submersible pump wells

Inspection and preparation before 2.1. installation:

(1) inspection wells is in line with the conditions of use for the pump well diameter, vertical and wellbore quality and static water level, water level, water inflow and water quality conditions and, if not in line with the conditions must be used to take corresponding measures, otherwise can't pump wells.

(2) check the power supply equipment and power lines can ensure the normal operation of the pump.

(3) the power supply voltage and frequency are in compliance with the conditions of use.

(4) familiar with the installation instructions, of newly drilled wells must be well washing and removal of mud and sand, can install submersible pump.

(5) check the electrical circuit, control and protection device is reasonable and safe and reliable.

(6) for all the good installation and use tools, erect triangular frame and a chain (or other lifting tools) to safety, reliable, easy to use.

2.2. installation

(1) of the pump body discharge under the strainer, and then open the water injection and gas hole bolt to the motor cavity is filled with clean water, make sure fill, prevent false full. And check whether the motor is leaking. That should be adjusted according to the site Water Leakage plastic pad bolt.

(2) carefully check the cables and connectors are bruised or damaged, found problems in a timely manner.

(3) 500 volt megohm table determination of insulation resistance of not less than 150 megohm winding.

(4) installed protection switch and starting equipment, and check the motor internal water is filled, tighten the water injection, a vent hole bolt, and good protecting wire plate, a water strainer to install wells.

(5) a short pipe section in the installation of the pump outlet, and a splint to lift the splint falls into the well, located in jingtai.

(6) and a pair of clamping plates of another section of the water pipe, and then lift the lower flange is connected with short pipes. Rising chain split first pay plywood, to make the pump down wells and is located in Jingtai, successively repeated installation, well, until all of the Bahrain, finally, a splint are not discharged will pump is fixed on the wellhead.

(7) finally put on the cover, pipe, valve outlet pipe etc..

(8) to pad each connecting flange, on the rear fastening screws to tighten the diagonal direction at the same time, to prevent Water Leakage skew.

(9) cables to fixed in conveying pipe flange groove, each section with fixed rope tied, well to be careful, cable can not be when using a sling, more not to bruise cable.

(10) under the pump process has stuck phenomenon, to overcome the card point, can not force the pump, so as not to die.

(11) personnel under wells wells pump installation is prohibited.

(12) the protection switch and starting equipment shall be equipped with voltage, current meter, indicator light, and installed on the distribution panel, placed in the appropriate location.

In fact, many times, when we buy things will be found, although it is the same thing but the price gap is very poor. Many people have such a doubt, in the end is because what causes the price of the centrifuge is different?

May be a lot of people were asked what led to the price of the centrifuge is different, the first reaction will be felt that the gap between imports and domestic. But in fact, the price gap between domestic and imported centrifuge centrifuge is not great, because our country after these years of continuous development, the core technology of the centrifuge has been fully mastered. So now the same grade of imported and domestic centrifuge centrifuge in terms of price.

In fact, caused by the price gap between the centrifuge is the main factor in the configuration and performance of the centrifuge, it is good for us to buy mobile phones, performance and configuration, the better the more expensive. Not to mention the centrifuge, the difference between the centrifuge is generally poor performance in the host. In general, the more functional, the price is corresponding to a lot of expensive, like some of the freezing function and the price of the heating function of the centrifuge is much higher than the price of ordinary centrifuge.

Pump industry generally exists in the following aspects of the main problems:

First, there are some problems in the main performance indicators. Pump flow head can not reach the labeled parameters, low efficiency, there is still a high standard, the phenomenon of chaos. Label not in the manner specified by the standard.

Two pump efficiency is low, the hydraulic model of the pump is flawed.

Three is the safety of the project problems. In the security category, the grounding measures are not in conformity with the specification of the specification, and the safety mark does not conform to the regulations.

Four is the appearance of rough, poor quality castings.

Five is the structure of a single, single function, low technology content.

Causes the above product quality flaw question mainly has the following several aspects the reason:

One is the technical condition of incomplete, outdated equipment, not enough processing equipment and testing equipment, process method does not correct, design documents deviation, testing method is not accurate, can not discover the problems and not take timely and effective measures.

Two is not enough understanding, can not accurately understand the standard terms, can not be strictly implement the requirements of the standard. For example, cable length, safety warning signs, the use of instruction safety content etc., these projects is often some small business out of the problem of multiple, seemingly simple, but if the standard is not enough to grasp, it is easy to appear unqualified, and of a very serious nature, belonging to an entire project failed. Therefore, once again, we should strengthen the study, we must seriously grasp the contents of the standard, in particular, should pay attention to the provisions of the safety standards. Avoid because of the negligence of the security project is not qualified.

Three is the quality management method is backward, the quality consciousness is weak, the management measure is not in place, the method is not accurate, appears the management aspect the loophole. Such as incoming inspection link, it should be to suppliers of any request, qualified supplier should determine how etc., you may only pay attention to the price of the product, largely ignoring the quality and technical requirements, always think, everyone in use will not have any problems. Because we test checks the adverse, in this part of the implied a lot of quality problems, if you really do not understand, can to some relatively large supporting the production of business consulting, let them help establish incoming verification, inspection method.

Four there is a man-made counterfeit. In order to meet the market demand, to increase competitiveness and man-made false targets. Main performance indicators are mainly refers to the flow head and pump efficiency, these parameters are the most concerned about the parameters of users, the general is also more attention, but why there are still many problems?

They think the main reason is that enterprises do not according to regulations were marked by tagging, also is to say, if realistic annotation, it will not appear a large number of the unqualified phenomenon, some enterprises in order to meet the needs of a normal competition, artificially exaggerated annotation, deliberately flow and head index of high standard, resulting in these projects failed. These phenomena can be avoided completely, therefore, we must resolutely put an end to the occurrence of this kind of phenomenon in the future business activities.

Five is the enterprise design ability is poor, the innovation consciousness is not strong. Many of the existing products, we can say that there is no technical content, is based on surveying and mapping, imitation, to sample processing, such as production, sameness of the product structure, low level of parts, single function, there is no guarantee of reliability, enterprises lack technical research and development capabilities.