1. High adaptability

(1) Can transport clean water and lightly polluted water, with media temperature up to 40℃ and PH value of 4-10; The maximum diameter of passable particles is 100mm.

(2) Applications: urban water supply, diversion projects, urban sewage and drainage systems, sewage treatment works, power station drainage systems, water supply and drainage for docks, water network hub diversion, irrigation and drainage, aquaculture and so on.I t’s suitable for occasions requiring low head  and  large  flow  which   is  generally   below   10m.  Submersible   mixed  flow  pump  with high efficiency nad good anti-cavitation performance, are suitable for occasions with large water level variations and high head, which is generally below 20m.

2. Lessinvestment in pump station, and easy operation and management

(1) The pump works underwater, it requires much less earthwork and structural engineering in building pump stations as well as less installation area. As a result, the construction cost could be reduced by 30-40%.

(2) Integration of motor and pump saves the time and labor-consuming on-site assembly procedure of ‘motor  –  transmission  mechanism  –  pump  axiscentering’,  thus  bringing  easy  and  fast  on-site installation.

(3) Easy management, and low cost of management and operating .

(4) It’s easy to operate with remote and automatic control.

(5) Low noise, without high-temperature area in pump stations; ensure operating environment well; fully underground pump stations could be built according to requirements, so as to retain environmental style and feature on the ground.

(6) It’s the best choice to solve flood prevention problems for motors installed in pump stations that are located along rivers and lakes with great water level fluctuations. In addition, by saving the long axis and intermediate bearings between motor and pump, the unit could run more stably and reliably.

3. Highreliability, no vibration, and low noise ZQ,HQ series submersible axial flow pump,mixed flow pump

(1) With excellent  hydraulic  model, ensure  users’ performance  requirements.  Interchangeability with traditional  models  for  users  to  choose.  There  are  a  series  of these  pumps,  which  have  awide high-efficiency  range,applicability to different working conditions,  high  energy efficiency, and  low operating costs.

(2) The double or triple mechanical seals prevent leakage. Adequately lubricated special thrust bearings with reasonable structure design and long service life are adopted.

(3) With Grade F insulation, and come with temperature protection, monitoring, leakage sensor and other warning units.

(4) With good cooling conditions as submersible in water, Operating stable with minimal vibration, and low noise.

Advantages of sled-type installation for submersible pumps:

1. Pumps canbe installed on sloping concrete foundations  or natural   slopes. Concrete pumping station can be saved by laying pump truck rails.It can save civil engineering investments. The pumps can be used for flood control and  emergency flood drainage. This installation method can be adopted in building irrigation and drainage pumping stations in rural areas.

2. Convenient  installation.Because the submersiblepump and the sled have been assembled together at factory, it only needs to put the entire pump unit on the slope on the   site and connect to the outlet conduit before pumping.

Sled-type pump performance reference  to the corresponding submersible pump,   we   will deliver final drawing   when customer decide to order.

Open suction boxes (suction sumps) have been widely used in small and medium-sized pumping stations due to their simple structure and easy construction. Researchers both at home and abroad have paid much attention to the hydraulic design of this kind of suction box, and have conducted many experimental studies. Many researchers propose their design rules for open suction sumps in the form of empirical coefficients, which are based on experimental results. However, these rules proposed by different researchers vary wildly, and there has not been a unified or optimal hydraulic design rule so far.

Bell mouth diameter, DL, is generally taken as the basic parameter of hydraulic design for open suction boxes (suction sumps) for the following reason. Water flow first flows through the

cylindrical surface between the bell mouth and the baseplate of the suction box, and then enters the pump through the bell mouth. Thus, it is natural to

take bell mouth diameter as the basic parameter in determining suction box dimensions.

However, the problem is that the suction bell has not yet standardizedand bell mouth diameter is variable. The ratio of bell mouth diameter to impeller diameter is different in different cases.  Taking DL as the basic parameter may cause confusion to the hydraulic design rule, and thus is inappropriate. If the suction bell can be standardized, then it would be the same to take bell mouth diameter or impeller diameter as the basic parameter of hydraulic design forsuction boxes. Otherwise, impeller diameter shall be taken as the basic parameter.

In this sample specification, our company takes impeller diameter, D0, as the basic parameter in determining various parameters.

According to Optimal Hydraulic Design for Suction Boxes of Pumping Stations, recommendations for open suction boxes are as follows:

(1) Clearance from the floor P

Clearance from the floor is recommended to be P = (0.68-1.2) D0, and it is recommended to   take a smaller value for large bell mouth diameter (1.67 D0) anda larger value for small bell    mouth diameter (1.46D0). For larger or smaller bell mouth diameter, P should be taken within this range.

(2) Back wall distance T

Basically, back wall distance is unaffected by bell mouth diameter. When water is pumped through the suction bell, some water flow will be inevitably sucked into the pump from the back of the suction bell, so it is necessary to keep a certain back wall distance. However, an overly   large back wall distance would increase water flow’s degree of freedom in the back wall space, as well as increase the possibility of vortex strip, so it needs to increase immersion depth.

According to the results of optimizing calculation, T should be (0.8-1.0) D0 to meet the requirements.

(3) Sump width B, pump spacing B

The suction sump should be wide enough to ensure some water flow can be sucked into the     pump smoothly from both the sides and the back of the suction bell, but an overly-wide suction sump would not only be meaningless, but also increase civil engineering investment. The optimal sump width is determined by bell mouth diameter to some extent. According to the results of optimizing calculation, the recommended sump width is (3.5-4.5) D0. It is recommended to takea smaller value for a large bell mouth diameter anda larger value for a small bell mouth diameter.

(4) Sump length XL

Under the condition of water flowing in a forward direction, it is necessary to make the suction sump long enough to ensure water flow becomes generally uniform before arriving at the suction bell. Sump length could be determined by the upper structure of the pump house, and it is generally (7.0-8.0) D0. Under the condition of water flowing in a side direction, it needs to increase sump length or take necessary current controlling measures. Determination of sump length has nothing to do with bell mouth diameter.

(5) Plane shape

As revealed by calculation results, plane shape of the suction sump has little influence on the pump’s working condition. However, according to experimental data, plane shape has some   effect on the suction sump’s hydraulic loss, with a heart shaped sump having the smallest hydraulic loss and rectangular sump having the largest hydraulic loss.

Float Valve

Clap door outside and connection dimensions

1. Theintelligent controller for submersiblepumps is mainly used to monitor overheating and water intrusion, which are caused by faults during the operation of submersible pumps, so as to ensure the normal working of theequipment. The controller is provided with 485 output interface which enables multiple point communications anddata processing through computers in real time. The controller is equipped with SCM. Besides its powerful functions, designers take a series of anti-jamming measures to cope with the special working circumstances of submersible pumps, so as to ensure its reliable operation. The input end of the sensor has high voltage impact resistance, and thus it is applicable in the working environment of pumps. This controller is very    suitable for being used together with pumps.

1.1 Intelligent controller for submersible pumps

The controller uses PT 100 platinum resistance as the bearing temperature sensor, JW6A as the winding temperature alarm sensor, and electrode switches to guard against water intrusion in the motor, oil chamber, and junction box. The controller has two working modes: monitoring mode and quitting mode.

Monitoring mode: under this mode, the customer can set bearing temperature limit on the controller. When the bearing temperature exceeds the limit, the controller will give an alarm. Whenthe winding temperature (JW6A) exceeds the limit or water intrudes in the motor, oil chamber, or junction box, the indicator in the alarm category display box will turn on. Meanwhile, the corresponding alarm relays, KS and KJ, will shut, and the signal can be used to connect indicators and control devices in the external circuit.After the fault is removed, the alarm sound can be stopped by pressing the reset button on the front panel. There is a reset output terminal on the back panel as well, which can be used to connect with the external reset button.

Quitting mode: under this mode, the controller canonly indicate bearing overheating, winding overheating (JW6A), and water intrusion in the motor, oil chamber, and junction box. The controller can show the real-time temperature of the bearing, and the alarm category display box can tell fault category. However, the corresponding relays, KJ and    KS, will not output signals (no action), and there will be no alarming sound.

1.2 Intelligent controller for submersible pumps II

The controller uses PT 100 platinum resistance thermometers as the bearing temperature sensorand the winding temperature alarm sensor, and has an alarm function against water intrusion in the motor, oil chamber, and junction box. The customer can set temperature limitsrespectively for the bearing and the winding. When the bearing temperature or winding temperatureexceeds the limit or water intrudes into the motor, oil chamber, or junction box,  the indicator in the alarm category display box will turn on. Meanwhile, the corresponding alarm relays, KS and KJ, will shut, and the signal can be used to connectindicators and control devicesin the external circuit. After the fault is removed, the alarm sound can be stopped by pressing the reset button on the front panel. There is a reset output    terminal on the back panel as well, which can be used to connect to the external reset button.

Quitting mode: under this mode, the controller can only indicate bearing overheating, winding overheating, and water  intrusion in the motor, oil chamber, and junction box. The controller can show the real-time temperature of the bearing and the winding, and the alarm category display box can tell fault category. However, the corresponding relays, KJ and KS, will not output signals (no action), and there will be no alarm sound.

1.3 Intelligent controller for submersible pumps III

The controller usesJW6A as the winding temperature alarm sensor and electrode switches to guard against water intrusion in motorand junction box. The controller has two working modes: monitoring mode and quitting mode.

Monitoring mode: under this mode, when the winding temperature exceeds the limit or water intrudes into the motoror junction box, the controller will give an alarm. When the winding temperature exceeds the limit or water intrudes in   the motor or junction box, the indicator in the alarm category display box will turn on. Meanwhile, the corresponding alarm relays, KS and KJ, will shut, and the signal can be used to connect indicators and control devices in the external circuit. After the fault is removed, the alarming sound can be stopped by pressing the reset button on the front panel. There is a reset output terminal on the back panel as well, which can be used to connect to the external reset button.

Quitting mode: under this mode, the controller can only indicate winding overheating (JW6A), and water intrusion into the motor and junction box. The alarm category display box can tell fault category. However, the corresponding relays, KJ and KS, will not output signals (no action), and there will be no alarm sound.

1. When ordering, you shall specify the name and modelof the submersible pump, number of units, installation method, range of complete sets, starting mode, head, flow rate, power, voltage, water quality, and materialsofmain parts. Note that the head means total head including all the head loss of the pump unit. If you are not sure about the total head, please provide the net head and installation method and ask our company to calculate the accurate total head and determine the model of the required submersible pump.

2. Please refer to the performance curves and tables in this specification to check the maximum head and minimum head. Please consult our company if the value is beyond this range.

3. When choosing installation method, it is recommended to give preference to the dimensions specified in this specification for steel shaft installation. Please consult our company if you want to change the dimensions in     the table or choose other dimensions for other installation methods.

4. Please note the range of complete sets specified in this specification. It is recommended to give preference to must-buy accessories and choose the optional accessories when required.

5. Starting modes include direct start, reduced-voltage autotransformer start, and soft start. Our company provides various starting cabinets with adedicated pump protector, automatic level controller, and logic sequence controller for pumping stations withmultiple pumps.

6. If not otherwise specified, the frequency of the power supply for the pump is 50Hz and the voltage is generally 380V. It is recommended to choose 6kV and 10kV for pumps with power exceeding 315kW. Please indicate in the contract that the requirements for ordering 50Hz and 660V products are acceptable. You can discuss special products with us which haveanother working frequency (say 60Hz) or voltage.