Product Introduction
The end suction centrifugal pump is a single-stage horizontal centrifugal pump with an axial inlet and radial outlet structure. It adopts a rear pull design and can be repaired without removing the pump body or the pipeline. Its flow rate range is 2.0 to 550 m³/h, and the head can reach 4.0 to 130 m. It is suitable for working conditions with medium temperatures ranging from -10 to 80℃.
Structural features
It adopts a single-stage horizontal design, with the inlet in the axial direction and the outlet in the radial direction.
Some models (such as NISO, NIS, NISF) adopt a rear-retracting structure. During maintenance, the pump body and pipeline can be retained, and only the rear cover needs to be removed to complete the impeller inspection.
The pump body has high concentricity, low vibration, and stable operation.
Performance parameters
Model KQWHZ (as of July 2024) has a flow rate ranging from 2.0 to 550 m³/h and a head ranging from 4.0 to 130 m.
The matching power ranges from 0.55 to 90 kW.
The rotational speed is 1480/2950 r/min.
The maximum working pressure is ≤ 1.6 MPa.
The operating noise is ≤ 75 dB(A) 1
Application scope
Suitable for the transportation of clear water or liquids with physical and chemical properties similar to clear water, including industrial circulation systems, water supply and drainage, building water supply, fire protection, etc. When customer requirements exceed standard parameters, the manufacturer can provide special customization services.
Because the suction pump works by using the atmospheric pressure to push water into the pump, the pressure at the pump inlet is lower than the atmospheric pressure. However, the pressure at the pump inlet cannot be lower than the saturated vapor pressure at the current water temperature. Otherwise, water will vaporize, and the gas dissolved in the water will escape, forming small bubbles mixed with the escaping gas. These bubbles enter the impeller, and as the pressure increases, the vaporized water vapor condenses into water, causing a rapid reduction in volume, forming a local vacuum. The surrounding water exerts a great impact force on the vacuum area and continuously acts on the impeller, causing fatigue of the impeller and the shedding of surface metal; at the same time, the active gas escaping from the water, with the heat released by water condensation, causes chemical corrosion of the metal, resulting in honeycomb-like pits on the impeller and gradually forming cavities. This phenomenon is called cavitation.
When the pump experiences cavitation, it will generate vibration and noise, and the flow rate, head, power and efficiency will significantly decrease. In severe cases, there will be a flow interruption. Therefore, the pump cannot operate under cavitation conditions. The influencing factors of centrifugal pump cavitation mainly include the suction height of the pump, the resistance of the suction pipe, the flow velocity, and the atmospheric pressure and working water temperature at the installation location of the pump. The atmospheric pressure at the installation location of the pump generally remains unchanged, and the resistance, flow velocity and temperature change little. Therefore, the main influencing factor for the pump not to experience cavitation is the suction height. The calculation method of the suction height of the pump is introduced below.
Suction height
To prevent the pump from experiencing cavitation, when the grid voltage drops during the pump's operation, the pump speed decreases, and the characteristic curve of the pump's head decreases accordingly. When the zero head (initial head)% of the pump is lower than the actual head, the pump cannot discharge water and the flow rate is zero. At this time, the energy transmitted by the motor to the pump will all be converted into heat energy, causing the water temperature in the pump and the pipeline to rise rapidly, the pump to heat up strongly, and it will be damaged quickly. Therefore, the pump is not allowed to work for a long time at zero flow rate.
Product parameters
| Product name | Clean water pump |
| Color | Customized Color |
| Material | Brass/Cast iron/stainless steel/Customized |
| Head | 4.6-200m/Customized |
| Speed | 1450-2900r/min/Customized |
| Capacity | 3.8-1200m³/h/Customized |
| Maximum temperature of conveyed liquid |
150°℃/Customized |
| Structure | Horizontal single stage centrifugal pump |
| Advantage | Wearresistant,corrosionresistant,energysaving,easy to install maintain |
| Applicaion scope | heating cooling cycle boosting,Industrial,urban,chemical,firefighting |
Product Comparison
Product advantages
Wide application scenarios
It can convey clear water, chemical media and corrosive liquids, covering fields such as building water supply, fire protection, chemical industry, and oil extraction. Some models support a design with NPSHr (Required Net Positive Suction Head) ranging from 1 to 8 meters, meeting the requirements of complex working conditions.
Efficiency and flow control
Efficiency range: 50% - 85%, flow coverage: 1 - 2000 m³/h. Through variable frequency speed regulation, a 50% - 100% speed adjustment can be achieved, flexibly adapting to different flow scenarios.
Product advantages
Wide application scenarios
It can convey clear water, chemical media and corrosive liquids, covering fields such as building water supply, fire protection, chemical industry, and oil extraction. Some models support a design with NPSHr (Required Net Positive Suction Head) ranging from 1 to 8 meters, meeting the requirements of complex working conditions.
Efficiency and flow control
Efficiency range: 50% - 85%, flow coverage: 1 - 2000 m³/h. Through variable frequency speed regulation, a 50% - 100% speed adjustment can be achieved, flexibly adapting to different flow scenarios.
FAQ
01.The difference between single-suction pumps and double-suction pumps?
The main differences between single-suction pumps and double-suction pumps lie in their structure, performance and application scenarios:
Structural differences
The impeller of a double-suction pump is designed with dual suction ports, usually featuring a horizontally split pump body structure. During maintenance, the upper cover can be opened to inspect and repair the internal components. The end-suction pump adopts a single-side suction design, mostly with a volute pump body, and has a more compact overall structure.
Performance Comparison
The double-suction pump has a greater flow rate and is suitable for high-flow scenarios. Due to the symmetrical design of the two impellers, it reduces axial force and operates more smoothly. The end-suction pump has a smaller flow rate, but it has a higher head and is suitable for high-head scenarios.
Applicable scenarios
Double-suction pumps are commonly found in large water supply systems, agricultural irrigation and other scenarios with high flow requirements. End-suction pumps are mostly used in building water supply, industrial circulating water and other situations with medium to small flow but requiring high head.
02.The difference between a double suction pump and a single suction pump?
The end suction pump and the single suction pump are essentially the same type of pump with different names. The main difference lies in the usage scenarios and structural details of the names:
Name Origin Differences
The end suction pump is another name for the single suction pump. Both refer to centrifugal pumps where the liquid is drawn in from one end of the impeller. The difference lies in:
The term "suction pump" is mostly used to describe the structural features (such as the inlet being located at the end of the pump body), while "single suction pump" is more commonly used to describe the working principle (i.e., single-end suction).
Structural Characteristics
The inlet and outlet of the end suction pump are located on the same side (perpendicular to the impeller axis), and it adopts a single-end suction structure; a single suction pump usually refers to an industrial water pump with only one impeller, and the inlet is located at one end of the impeller.
Application scenario
The end suction pump is suitable for scenarios with small to medium flow rates and low to medium head (such as air conditioning circulating water and building water supply), while the single suction pump is more commonly used in scenarios with large flow rates and low pressure (such as urban water supply and fire protection water supply).
03.How to disassemble a suction centrifugal pump?
Step 2: Loosen the bearing end cover wheel and remove the bearing end cover.
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