VTP series vertical long shaft pump

1.Overview

VTP series vertical long-axis pumps are single-suction, multi-stage vertical guide vane water pumps. This series of pumps is an advanced and mature long-axis pump series product developed by absorbing the advanced design and manufacturing experience of vertical long-axis pumps at home and abroad and combining the domestic market demand. It has the characteristics of high efficiency, reliable operation, fast start-up, compact structure, small footprint, etc. It is widely used in industries such as power, metallurgy, fire protection, mining, steel, municipal administration, etc. to transport clean water, rainwater, seawater and other media below 80 ℃.

Model meaning:

100VTP126-14A × 5

100 — Pump outlet diameter is 100 mm

VTP - Vertical Long Shaft Pump

126 — Design point flow rate 126m ³ /h

14 — The design point head of a single-stage impeller (without cutting) is 14m

A — indicates the impeller outer diameter cutting code ( A , B , C ... )

5 — The impeller has 5 stages

2.Conditions of use

1. A certain submersion depth must be maintained when the water pump is running. The minimum submersion depth value can be found in the pump installation dimension drawing.

2. The water cannot contain any oily substances.

3. The water must not contain too many corrosive minerals.

4. The sand content in water shall not exceed 0.01 % (by weight).

5. The pH value of water should be between 6.5 and 8.5 .

6. The well should be upright.

3. Structure Description

The structure diagram of the VTP series pump is shown in Figure 1 .

<1> Drive type

VTC series pumps have four drive modes: ⅰ) directly driven by ordinary vertical motor; ⅱ) directly driven by vertical hollow shaft motor; ⅲ) equipped with diesel engine or steam turbine through right angle gearbox; ⅳ) equipped with horizontal motor through right angle gearbox.

<2> Structure

The pump equipment is mainly composed of three parts: pump body, water lifting pipe and pump seat. The first two parts are located underground, and the pump seat is located above the well.

ⅰ) Pump body parts

The pump body components mainly include: filter screen, impeller, sealing ring, cone sleeve, suction bell mouth, guide vane body, guide bearing, impeller shaft and other parts.

The suction bell mouth and the guide vane body are connected by flanges, and the impeller is fixed by a cone sleeve.

ⅱ) Water pipe parts

The water pumping pipe components are composed of water pumping pipe, transmission shaft, guide bearing body, guide bearing and coupling and other parts.

The water pipes are connected by flanges; there are two types of couplings: threaded couplings and sleeve couplings, and threaded couplings are generally used.

ⅲ) Pump seat parts

The pump seat components mainly include the water outlet elbow and the packing device. When driven by an ordinary vertical motor, it is also equipped with a motor support, thrust bearing components, anti-reverse mechanism, pump, motor coupling and other components.

The entire pump base assembly is fixed to the foundation with multiple anchor bolts.

4. Installation

Before installation, always inspect the pump equipment.

l Count the parts and check whether any are missing or damaged.

l Check all assembled fasteners for proper tightness.

l Turn the pump shaft, it should rotate smoothly.

Installation steps:

<1> Install the filter.

<2> Use a coupling to connect the lower transmission shaft and the impeller shaft.

<3> Connect the lower water pipe and the uppermost guide shell with bolts.

<4> Lift the connected parts and slowly lower them into the well, then use the flange to support and fix them on the square wood of the well platform.

<5> Install the guide bearing components and the previous section of the transmission shaft and water pipe.

<6> Repeat steps 4 and 5 until all the drive shafts and water pipes are installed.

<7> Take out the filler in the filler cavity of the water outlet elbow, lift the water outlet elbow, pass the upper shaft through the filler cavity hole, connect the rising water pipe and the water outlet elbow, and then slowly lower it until the water outlet elbow falls on the foundation.

<8> Install the packing and tighten the packing gland.

<9> Depending on the driving mode, the following steps are divided into three situations:

ⅰ) Ordinary vertical motor drive

First install the motor support on the upper part of the outlet elbow, then fix the thrust bearing body to the motor support with bolts, put the thrust bearing in the thrust bearing body, install the key on the upper shaft, insert the bearing bushing, then install the anti-reverse ratchet, and finally install the pump coupling and tighten it with a small round nut (adjusting nut).

Figure 2. Assembly diagram of ordinary vertical motor driven pump seat components

ⅱ) Hollow shaft motor drive

Remove the waterproof cover on the upper end of the motor, lift the motor, pass the upper shaft through the hollow rotor of the motor, install the motor on the water outlet elbow, and install the adjusting nut.

ⅲ) Driven by right angle gearbox

The installation method is similar to that of the hollow shaft motor drive.

<10> Adjust the axial clearance by adjusting the adjusting nut.

5. Preparation before operation

1. Adjustment of axial clearance

Before the water pump is tested, the axial clearance between the guide shell and the impeller must be adjusted so that the impeller does not rub against the guide shell during operation and can meet performance requirements. This pump uses an adjusting nut to adjust the axial clearance. The main steps are as follows:

A newly installed pump often cannot rotate. By adjusting the adjusting nut, the shaft can just rotate. The position of the nut at this time is used as the starting adjustment point.

The adjustment amount of axial clearance is half of the total movement of the pump. The total movement is usually 6-8mm , that is, the general adjustment amount is 3-4mm . The adjustment amount divided by the pitch of the adjusting nut is the number of turns of the adjusting nut. For example, for a pump with a total movement of 6mm and a pitch of 1.5mm for the adjusting nut , the adjusting nut should be turned two turns from the starting adjustment point. After the adjustment is completed, screw in the second small round nut, or insert the stop pin to lock it.

<2> After adjusting according to the above method, start the water pump and observe whether the ammeter exceeds the rated value of the motor current. If the motor working current is too large ( more than 110% of the rated current ), it means that the gap is too small and the pump should be stopped and adjusted a little larger. For newly installed water pumps, it is required to run for 20 minutes before adjusting again. For deep wells containing a small amount of sediment, the axial clearance should be increased. This pump is recommended to rotate ( 1/2 to 1 ) more turns than the original adjustment position to reduce the wear of the impeller during operation.

2. Pre-lubrication

<1> Before operating the deep well pump, clean water should be passed into the lubrication water hole of the pump seat to ensure pre-lubrication of the shaft and bearings.

<2> Where there is no running water, a pre-moistening water tank with a volume of about 0.2m3 should be installed. The motor can only be started after most of the water in the water tank flows into the deep well ^pump .

<3> Where there is no water tank, buckets can be used to temporarily fill the water, but the water volume should not be less than 0.1 m3 ^.

3. Check before starting

Before starting the long shaft pump, at least the following items should be checked: foundation installation, axial clearance adjustment, packing gland pre-tightening, pre-lubrication, motor lubricating oil, electrical devices and pump rotor rotation flexibility. The deep well pump can be started only when the checked items meet the requirements.

6 .Startup and Operation

It is recommended to start the pump by reducing pressure. The valve must be opened when starting. After using the deep well pump, it is required to measure the static and dynamic water levels of the deep well frequently. Pre-lubrication is required for each start. When the motor stops, check the height of the lubricating oil level. If it is insufficient, add enough oil.

7.Common faults and troubleshooting methods

8. Maintenance

1. Pump disassembly

The disassembly of the pump is generally the opposite of the installation process. All contact surfaces, the end faces and stoppers of the transmission shaft and the water pipe, and the surface of the threads should be cleaned with kerosene and coated with anti-rust oil.

2. Disassembly of the pump body

<1> Loosen the lower guide shell;

<2> Use a punch to hit the small end of the cone sleeve from the water inlet of the impeller to loosen the cone sleeve and the impeller, and then remove the cone sleeve and the impeller;

<3> Remove the next-stage guide shell;

<4> Repeat steps 2 and 3 to disassemble all guide casings, impellers and cone sleeves;

After the pump body is disassembled, check whether the parts are worn. If they are severely worn, they should be replaced.

4. Repair

<1> After disassembling the pump body, check the wear of the impeller. If it is severely worn, it should be replaced; if it is only slightly worn, you can continue to use it after grinding its contact surface. Check the impeller sealing ring and consider whether to replace it according to the wear condition.

<2> If the conical surface of the guide shell and the impeller is worn, it should be recalibrated to ensure that it is consistent with the impeller. In addition, the flow passage of the guide shell should be inspected and cleaned as necessary.

<3> If there is chrome-plated area on the impeller shaft, it should be inspected and replaced if it has peeled off.

<4> Check the guide bearing inside the guide housing and consider whether to replace it based on the wear condition.

<5> Check whether the cone sleeve is damaged. If damaged, replace it.

5. Periodic maintenance

The maintenance cycle of the water pump is six months to one year. After the water pump has been running for one year, if the unit is still running smoothly, there is no big vibration, and the reading of the ammeter is normal, then the maintenance cycle can be appropriately extended, but not more than three years. If the operation does not exceed one year, but the unit vibrates violently, it should be considered whether the guide bearing is damaged prematurely. At this time, the machine should be stopped for inspection and the damaged parts should be replaced. Check the sand content in the well regularly. If it is too high, the well should be cleaned.

Vertical long shaft pump on-site production album: