Overview

1. Purpose:

The HW type pump is a horizontal, single-stage, single suction, volute mixed flow pump. Suitable for transporting clean water or other liquids with physical or chemical properties similar to water. The temperature of the transported liquid should not exceed 50 ℃. Widely used in various occasions such as farmland irrigation, industrial and urban water supply and drainage.

The performance range of HW pump: flow rate of 90-9000 ㎡/h, head of 3.5-22m.

2. Characteristics:

Simple structure, reliable use, convenient decoration, high efficiency, small size, and light weight.

3. Transmission mode:

There are direct transmission and variable speed transmission. The commonly used power engines are electric motors and diesel engines. When ordering, the model of the power machine (power, speed) should be clearly specified in order to determine the specifications of the coupling or pulley.

4. Water pump direction:

Looking towards the inlet of the water pump, the impeller generally rotates counterclockwise (650HW-5, -7, -10 pumps rotate clockwise).

5. Model Description: Taking 100HW-8S as an Example

100- Pump inlet and outlet diameter mm.

HW Horizontal Vortex Shell Mixed Flow Pump.

8- Design head (m).

S-variant code.

Structure and Function

1. The HW type pump is mainly composed of main components such as pump cover, impeller, pump body, pump shaft, shaft sleeve, and bearing body (diameter ≤ 350mm) or bearing frame diameter ≥ 400mm (Figure 1, Figure 2).

2. The pump cover is connected to the pump body and the inlet pipe respectively. There should be an appropriate gap between the pump cover plane and the impeller plane. If the gap is too small, friction will occur; Excessive clearance can cause a large amount of pressure water in the pump body to reflux, reducing the efficiency of the pump. The suitable gap for actual use is 03-07mm (pushing the pump shaft towards the inlet end of the pump), and the gap can be adjusted by increasing or decreasing the thickness of the paper pad.

3. The shaft seal device consists of packing, packing gland, packing ring, and packing box on the pump body (100HW, 150HW, and 200HW pumps do not have packing rings). Its function is to prevent air from being sucked into the pump and to prevent excessive water from flowing out along the shaft from the pump.

4. The shaft sleeve is used to protect the pump shaft. Can be replaced after wear and tear.

5. The pump shaft is supported by a single row radial ball bearing. Bearings can be lubricated with lubricating oil - the amount of oil should be controlled between the markings of the oil benchmark; Lubricating grease can also be used for lubrication - it can be added when assembling the water pump. Supplement by disassembling and assembling the front and rear covers during use.

6. The screw hole on the upper end of the pump body is used for adding water or connecting a vacuum pump for pumping water.

7. To expand the range of use of the pump and meet different user requirements, the outer diameter of the impeller can be cut or a different performance impeller can be used (indicated by the letter "A").

8. The accessories of 100-350HW pumps include inlet and outlet bends, flexible bends, bottom valves, and pulleys or couplings. The accessories of 400-650HW pumps include inlet and outlet bends, check valves, pulleys or couplings. Available for users to choose from.

9. The bearing model and packing specifications of HW type pump are shown in Table 1 and Table 2.

Figure 1 Structure diagram of 100-350HW pump (β 50HW-8 pump has two types of outlet: upward and horizontal)

Table 1 Bearings and Packing for 100-350HW Pumps

Figure 2: Structure diagram of 400-800HW pumps (outlet direction of 650HW-5, -7, -10 pumps)

The illustration is opposite - looking towards the pump inlet, the impeller rotates clockwise)

Table 2 Bearings and Packing for 400-800HW Pumps

Please refer to page 9, point 2, precautions, and point 8

Main technical specifications

1. Pump performance: Refer to the HW pump flow head curve (Figure 3) and performance tables (Tables 3 and 4)

2. Performance changes of pumps:

① Changing the speed of the pump can alter its performance and expand its range of use;

② The method of changing the speed: changing the outer diameter of the pulley or changing the transmission ratio of the gear reducer, or using a power machine with different speeds.

③ The relationship between the flow rate (Q), head (H), and power (N) of the water pump after changing its speed is shown in the following equation:

Q1＝Q， H1=H（）2， N1=N()3

In the formula, Q1, H1, and N1 respectively represent the flow rate, head, and power after the speed change.

Q. H and N respectively represent the flow rate, head, and power at the specified speed.

④ When the speed of the water pump increases, the power consumption increases, the suction vacuum degree decreases, and the service life is shortened. Excessive increase in speed may lead to other accidents, so it should be used with caution.

⑤ When the speed of the water pump is excessively reduced, the efficiency of the pump is low. Therefore, it is advisable to avoid operating the pump at too low a speed as much as possible.

In order to expand the range of use of the pump as much as possible and meet the different requirements of users, our factory has designed and produced multiple matching pumps with different speeds, power, etc. In the future, while vigorously developing new products, we will also further improve and develop various suitable supporting facilities to better serve our customers. Please provide information, suggestions, and choices to our users.

3. The allowable suction vacuum degree (Hs) must have a critical cavitation allowance (NPSH) c, which can generally be approximated by the following two equations:

[Hs]≈10-(NPSH)c

(NPSH)r≈(NPSH)c+0.3

In the formula: [Hs] - allows for vacuum suction, m。

(NPSH) c-critical cavitation allowance, m。

(NPSH) r - Must have cavitation allowance, m。

Head H()

Flow rate Q (㎡/h)

Figure 3 Flow Head Curve of HW Pump (for User Selection)

Table 3 Performance Table of HW Pump (Basic Type)

Pump quality

Continued Table 4

Pump installation

HW type pumps are commonly installed on the ground, but can also be installed in a semi drop well. When installing in a semi drop well, it can reduce the suction height and losses caused by the length of the inlet pipe during ground installation.

1. Installation principle:

① The installation height of the pump: The highest upper water surface should not be higher than the lower end of the bearing, and the lowest upper water surface depends on the allowable suction vacuum height Hs of the pump (the loss of the support pipeline should be reduced).

② The water pump should be as close as possible to the water source to shorten the inlet pipeline and reduce pipeline losses.

③ The pipeline should be straight and short. Usually, a bent pipe is used for imports. By using the water pump foot foundation to pour diagonally, the need for a water outlet bend can be eliminated.

2. Attention:

① When using a belt drive, the pulleys of the water pump and power machine should be aligned. A safety cover should be installed on the pulley and outside the belt.

② The pump cover should not be directly connected to a bent pipe. The straight pipe should be connected first before the bent pipe to ensure uniform flow velocity distribution at the inlet.

③ Rubber pads or asbestos threads should be added between the connecting flanges of the pipeline to prevent water and air leakage.

④ The position of the inlet pipe extending into the inlet pool should be appropriate. The distance between the inlet pipe and the inlet pool wall is generally 0-1.5 D, where D is the diameter of the inlet pipe. For small pumps, take the larger value, and for large pumps, take the smaller value.

⑤ The outlet should be submerged in the water from the outlet pool and as close to the water surface as possible to reduce head loss.

⑥ There should be a mesh cover in front of the water inlet to prevent grass and debris from entering the pump and breaking or blocking the flow channel.

⑦ When the pump is installed on a ship and lubricated with lubricating oil (thin oil), it should be considered that the pump may cause the bow of the ship to be lowered or the hull to tilt when filling water. It is necessary to ensure that the pump shaft remains in a horizontal position during pump operation to avoid bearing damage due to lack of oil.

⑧ 650HW pumps generally use two sets of single row radial thrust ball bearings 46322. When the speed of 650HW-7 and 10 pumps is 590r/min, one set of 446322 and one set of 46322 are used. During assembly and use, it is necessary to ensure a suitable axial clearance (adjust the thickness of the paper pad), so that the bearing has good load-bearing capacity and a longer service life. When the speed of 400HW-10 pump is 980r/=in, one set of 446312 and one set of 46312 are used, and the same requirement is also applied.

3. Outline installation diagram and dimension table

① The HW pump and its external installation diagram are shown in Figure 4 and Figure 5

② The external installation dimensions of the HW pump are shown in Table 5.

Usage and maintenance

1. Test drive:

After installation, the pump needs to undergo a trial run to check the direction of rotation and remove any issues during installation.

2. Driving sequence:

① Close the outlet gate valve or check valve.

② Adding water: First turn on the machine and add water from the screw hole on the upper part of the pump body, or open the check valve to pour water from the water tank back into the water tank; Alternatively, a vacuum pump can be used to extract air and water (when the vacuum pump extracts air from the pump and turns it into water, the water pump can be started and the vacuum pump can be stopped).

③ When the power machine reaches the normal speed, open the gate valve, and then adjust the tightness of the packing. If the pump operation and bearing temperature are normal, and the vibration is slight, it can continue to run (when using the check valve, the valve cover should be lifted after the water is discharged to reduce the resistance).

3. Use and maintenance:

① When bearings are lubricated with thin oil, the oil level of the bearing body should be regularly checked and controlled between the two markings of the oil benchmark; When bearings are lubricated with dry oil (grease), an appropriate amount of oil should be added regularly. For 100-350HW pumps (front and rear covers can be removed to supplement), for 400-800HW pumps, oil cups can be used to supplement.

② Regularly check the temperature rise of the bearings. Generally, it should not be higher than the ambient temperature of 35 ℃, but the maximum should not exceed 75 ℃.

③ Pay attention to whether there is friction and impact sound when the pump is running. If there is friction between the pump cover and impeller, a paper pad can be added between the pump cover and the pump body. The suitable gap for actual use is 0.3-0.7mm

④ The adjustment of the packing must be appropriate, and the liquid should intermittently leak out in droplets from the packing cover. If the packing is too tight, the shaft will heat up and power will increase. If the packing is too loose, there will be too much liquid leakage and efficiency will decrease.

⑤ If the motor is directly connected to the pump, the axis lines of the two shafts should be in a straight line.

⑥ Check for any air leaks in the inlet pipeline.

⑦ Pay attention to whether the power suddenly increases or decreases, and whether the traffic suddenly decreases. If there is, the vehicle should be parked for troubleshooting.

⑧ Regularly check whether each bolt is loose due to vibration.

⑨ In winter, the water in the pump and pipeline should be drained after parking.

⑩ After the pump has been working for 1000 hours or six months, the lubricating oil or grease should be replaced. Change the oil every 1000 hours or one year in the future.

Malfunctions and troubleshooting

Pump quality

5.1

Pump quality