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How to check the leakage problem of corrosion-resistant centrifugal pump

Mixed acid is a strong corrosive medium. In daily use, the choice of corrosion-resistant pump varies depending on the working environment. Commonly used fluorine-lined centrifugal pumps, stainless steel centrifugal pumps, self-priming pumps, pipeline pumps or mortar pumps, etc. Therefore, according to the working conditions, you can consult our technicians to choose a suitable corrosion-resistant centrifugal pump.

Based on actual experience, the common reasons for leakage of centrifugal pumps are summarized, and the specific analysis is as follows

After the corrosion-resistant centrifugal pump leaks during operation, visually inspect whether there is a leak due to a hole, and then check whether the seal between the shaft seal and the end fails, the basic cause is the damage of the mechanical seal.

The main cause of mechanical seal failure

(1) When the centrifugal pump is in operation, due to abnormal conditions such as vacuuming, holding pressure, cavitation, etc., the radial force is large, which separates the dynamic and static ring surfaces or destroys the mechanical seal.

(2) When the mechanical seal is installed, it shrinks too much, causing serious damage to the inner hole of the friction pair.

(3) The sealing ring is too tight, and the elastic spring cannot adjust the radial fluctuation of the friction pair.

(4) The sealing ring is very loose. When the friction pair fluctuates axially, the friction pair separates from the static ring seat.

(5) The actual output of the pump is small, the internal circulation system of the medium is large, and the heat generation accumulates, which leads to medium vaporization and invalid sealing.

(6) Long-term stop, no manual roulette when restarting, the friction pair will destroy the cover due to adhesion.

(7) Problems in model selection, frequent changes and adjustments to working conditions.

If the corrosion-resistant centrifugal pump leaks, if it is not discovered in time, it will often lead to larger accidents or losses. You must pay attention and take effective measures.

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Corrosion-resistant pump installation

Corrosion-resistant pumps can be divided into horizontal and vertical according to the installation method. Horizontal corrosion-resistant pump WX type horizontal corrosion-resistant pump is different from traditional centrifugal pumps. It has the characteristics of simple structure, reliability and convenient maintenance. The gap between the pump impeller and the pump casing is large, and the solids can be discharged without any obstruction, and there is no blockage at all. It is suitable for conveying solid-liquid mixed liquid, suspended solid horizontal corrosion-resistant pump and fibrous fabric medium. The diameter of the solid particles is not more than 60% of the diameter of the discharge port, and the fiber length is not more than five times the diameter of the discharge port.

1. Preparation before installation 

1) Check the water pump and motor to confirm that there is no damage during transportation and loading and unloading.

2) Prepare tools and lifting machinery, and check the foundation of the machine according to the diagram.

2. Installation sequence  

1) When the whole set of water pump arrives on site, the motor has been installed. When leveling the base, it is not necessary to remove the pump and motor.

2) Put the base on the foundation and prepare to fill it with concrete after leveling. 

3) Check the levelness of the base with the level of the pump's discharge outlet. After leveling, install the anchor bolts and pour the anchor bolts with concrete. 

4) Put the steel ruler on the coupling (up, down, front and back measurement), and check whether the axis lines of the pump and the motor coincide. 

5) After the concrete for fixing the anchor bolts is completely dry, tighten the nuts of the anchor bolts, and finally check the levelness of the whole unit. If there is a slight unevenness, use a wedge iron to level it. 

6) Install suction and outlet pipes. When the pipes are combined with the pump, care should be taken not to increase the weight and pressure of the pipes on the pump to avoid deformation of the pump. 

7) Clean up the environment and maintain hygiene.

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HMFL type fluorine lined magnetic force pump

HMFL/HMCF type fluorine lined magnetic force pump leakage prevention design canceles the shaft seal, uses the magnetic force coupling to drive indirectly, completely eliminates the trouble of drip leakage, never pollutes the use site.Due to the production of Jiangsu Weidekai Pump Technology Co., Ltd. lined with fluorine magnetic pump flow part of the selection of `fluorine plastic alloy` manufacturing.

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Maintenance and inspection of diesel generator set for oil pump

  The oil pump is more important for diesel generator sets. Its correct operation is the prerequisite for using the generator. Today, we will explain to you how to do the maintenance and inspection of the oil pump.

  As we all know, the function of the oil pump is to make the generator set circulate in the bottom pressure oil pipe car, and can provide enough gasoline and diesel for the diesel engine pump under the working pressure. The volume of the oil pipeline should be 3-4 times the full load, and the ignition advance angle should be large. Therefore, before the diesel generator set starts, the gas in the fuel pipe can be discharged by the manual pump on the fuel pump. Only in this way can the gasoline and diesel oil within 10 meters of the fuel transfer pump management center be sucked in within 0.5 min. After the fuel pump is exhausted, the rocker nut can be tightened. After the oil pump is used for a long time, its parts should also be checked and maintained. In the case of inspection, what common problems should we attach great importance to? Then we will analyze it for you.

  1. If the product has damage, dents, or black spots, use abrasive paste to grind the product. If the condition is serious, it should be replaced.

  2. If the cover of the product seat surface is seriously damaged or uneven, it should be removed and replaced.

  3. The small chain and the small chain sleeve are seriously damaged, causing the gap to expand. The worse the tightness, the more serious the leakage of the diesel generator set. It is necessary to connect the small chain with the cover when replacing, or choose a small chain with increased specifications, but mutual research is required.

  4. The mandrel of the coarse filter in the high-pressure hose is easily blocked by cotton-like dirt and damages the supplied oil. Therefore, attention should be paid to the cleaning of gasoline and diesel and the removal of waste on the filter element.

  5. When the rubber ring of the piston rod of the hand steam pump is damaged, it should be replaced in time. After the assembly line of the center of gravity of the oil pump, it is stipulated that the oil pump’s piston rod small chain and other fitness sports parts should have wonderful themed activities in the whole itinerary, without obstruction or jamming. The gasoline pump should be light and flexible. Please pay attention when installing this product. Need to be embedded in the spring yellow groove.

  It is not difficult to see how important the maintenance of the oil pump of a diesel generator set is. In the course of using diesel generator sets, the maintenance of the oil pump is often neglected. In fact, the oil pump is a key component of the generator. In order to maintain the long-term durability of the generator, the oil pump components should be carefully inspected to increase the service life of the diesel generator set.

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What is the basis for the selection of heat transfer oil pump?

What is the basis for the selection of heat transfer oil pumps? The following editor will give you some popular science.

  The heat transfer oil pump should be considered from five aspects according to the process flow and the oil supply and discharge requirements, including liquid delivery volume, device head, liquid properties, piping layout, and operating conditions.

  1. The nature of the liquid delivered by the heat transfer oil pump. Including the name of the liquid medium, physical properties, chemical properties and other properties. The physical properties include temperature c, density d, viscosity u, whether there is solid particle diameter and gas content in the medium, etc. This relates to the head of the system and the effective cavitation allowance. Calculation and type of heat transfer oil pump: chemical properties, mainly referring to the chemical corrosiveness and toxicity of the liquid medium, are an important basis for the selection of heat transfer oil pump materials and which shaft seal to choose.

  2. Operating conditions of heat transfer oil pump. Such as liquid operating temperature T, saturated steam power P, suction side pressure PS (absolute), discharge side container pressure PZ, altitude, ambient temperature, whether the operation is intermittent or continuous, and the position of the heat transfer oil pump is fixed or movable .

  3. The head required by the installation system. It is another important performance data for pump selection. The heat transfer oil pump is a centrifugal pump, which can be determined according to the actual situation of the user. No need to enlarge the head. The piping layout conditions of the device system refer to the liquid delivery height, the liquid delivery distance and the liquid delivery direction, the lowest liquid level on the suction side, the highest liquid level on the discharge side and other data and the pipe specifications and their length, materials, pipe fitting specifications, quantity, etc. In order to calculate the comb head and check the cavitation margin.

  5. Flow rate is one of the important performance data for selecting heat transfer oil pump, it is directly related to the production capacity and delivery capacity of the entire device. For example, the three flow rates of the pump can be calculated in the process design of the design institute. When selecting the pump, take the large flow as the basis and take into account the normal flow. When there is no large flow, 1.1 times the normal flow can usually be taken as the large flow.

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HMDB series suspension magnetic slurry pump

HMDB series suspension magnetic slurry pump, double double double suction pump body, impeller pump shaft turn not directly within the magnetic drive two impeller turns, low speed, high lift, wear-resisting performance is good, high efficiency and energy saving low noise, is jiangsu weed kai pump industry co., LTD.

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Why doesn't the petrol pump pump oil?

 When the automobile oil pump is not pumping oil, it should be repaired in time to prevent the malfunction from expanding. At this time, the vehicle can be inspected to preliminarily determine the location of the fault, and then analyze the oil pump, diagnose the location, cause and extent of the oil pump problem, analyze the automobile oil pump, and solve the problem.

  1. The plunger and plunger sleeve are worn. During use, the mechanical impurities in the fuel enter the fuel injection pump cavity to form abrasive wear, coupled with the corrosive effect of the fuel, increase the gap between the plunger and the sleeve, and cause the fuel to leak from the plunger sleeve gap during the fuel stroke. , So that the oil supply is insufficient or no oil supply.

  2. The oil outlet valve is worn. The mechanical impurities in the fuel will cause wear of the delivery valve, pressure relief belt or valve seat under the high-speed flow, and the sealing is not tight, making the residual pressure in the high-pressure fuel pipe insufficient. When the fuel injection pump pumps fuel again, part of the fuel supplements the insufficient pressure in the high-pressure fuel pipe, so the fuel supplied to the cylinder is insufficient, and in severe cases, no fuel is supplied.

  3. The delivery valve spring fails. The oil outlet valve spring makes the oil outlet valve and the valve seat closely fit. The seal is reliable and prevents the backflow of fuel from the high-pressure fuel pipe. If the oil outlet valve spring is fatigued and the elastic force is reduced, the one-way shut-off effect of the oil outlet valve will become worse, and the phenomenon of reverse flow of oil will occur.

  4. Insufficient pressure in the low-pressure oil circuit. There is a certain oil pressure in the low-pressure oil circuit of the fuel injection pump to ensure that the fuel enters the pump cavity quickly, and to ensure that the fuel injection pump needs oil. If the pumping capacity of the fuel transfer pump is reduced or does not pump oil, or the diesel filter, the oil circuit is blocked, or air enters the fuel system, the oil pressure of the low-pressure oil circuit of the fuel injection pump will be reduced, or even no pressure can be generated. When the fuel injection pump is working, the fuel cannot quickly enter the fuel injection pump cavity, causing the fuel injection to fail to pump fuel or to pump insufficient fuel.

  5. When the fuel quantity adjustment lever or governor is stuck in the fuel supply reduction position, or at the non-fuel supply position, the effective stroke of the fuel injection plunger is reduced or zero, and the fuel injection pump is insufficient or not supplied. Fuel supply.

  6. The engine's acceleration adjustment mechanism is stuck or adjusted improperly, and the pressure acting on the speed regulating spring is reduced, and the fuel supply of the fuel injection pump is restricted by the governor, that is, the fuel supply is insufficient.

  7. The plunger spring fails. If the plunger spring is fatigued or broken due to long-term compression, it will not be possible to ensure that the plunger returns in time and that the roller body and the cam are in good contact. This makes the plunger stroke smaller, resulting in insufficient or no oil supply.

  8. Wear or improper adjustment of the cam and roller body will reduce the lift of the plunger and cause insufficient oil supply; damage to the camshaft bearing will cause the camshaft to deviate radially (downward), resulting in a drop in pump oil pressure, resulting in The fuel supply is reduced.

  9. The pinning of the column is mostly due to the small clearance between the plunger and the sleeve, or the excessive viscosity of the diesel; improper adjustment of the roller body (adjustment is too high), the top of the plunger will collide with the oil outlet seat when the plunger is lifted. It becomes thicker and gets stuck in the plunger sleeve without supplying oil.

  10. Improper selection of diesel. For example, when the diesel with a higher freezing point is selected in winter, the fuel cannot flow into the pump cavity quickly due to the poor fluidity of the diesel, resulting in a decrease in fuel supply. If the diesel does not flow, the fuel supply will be interrupted; if the diesel with low freezing point is selected in summer, because of its low viscosity and easy leakage, it will also cause insufficient fuel supply.

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Working principle of diesel generator fuel injection pump

The fuel injection pump is the most important component in the diesel fuel supply system. It is usually composed of a fuel injection pump/governor and other components installed together as a whole. It exists as the "heart" component of the diesel generator; the editor will lead everyone Let's take a look at the working principle of the fuel injection pump!

  The working principle of the plunger fuel injection pump is shown in the figure. When the plunger descends to the lowest position, the oil hole on the sleeve is opened, and the fuel is sucked into the inner cavity of the sleeve from the oil inlet cavity.

  When the plunger is lifted from the lowest position by the fuel injection pump to start the pumping stroke, part of the fuel flows back to the fuel inlet space through the oil return hole until the upper end of the plunger closes the oil return hole, and the fuel begins to be compressed. The "geometric start point" of the fuel injection pump.

  The plunger continues to move upward. When the plunger chute opens the oil return hole, the high-pressure M oil on the upper part of the plunger communicates with the oil return hole through the straight groove and annular groove of the plunger head, and then flows back to the oil inlet space. The "geometric end of oil supply" of the oil pump.

  After that, the plunger moves up to the highest position of the stroke, and the fuel flows back to the fuel inlet space.

  Obviously, in the entire upward stroke of the plunger, the actual effective fuel supply stroke is only the stroke from the beginning of the upper edge of the plunger covering the oil return hole to the end of the lower edge of the chute opening the oil return hole, so the plunger’s The relative position of the chute and the oil return hole on the sleeve determines the fuel injection volume and at the same time determines the fuel injection time. And every time the plunger rotates one position, there is an effective stroke, so rotating the plunger can change the fuel injection volume.

  The above content is the working principle of diesel generator fuel injection pump explained by the editor. I hope that the introduction of the editor can be helpful to you!

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The reason why the fuel injection pump of the generator set does not supply fuel

If there is a reason why the fuel injection pump of the generator set does not supply fuel, how should we deal with this situation?

  After discovering this fault, first check whether there is diesel in the diesel tank of the diesel generator, whether the fuel tank switch is turned on, and whether the vent of the fuel tank is blocked. Then, unscrew the bleed screw of the diesel filter and the fuel injection pump, and pump the oil with the hand oil pump or rely on the self-flow of the diesel (depending on different models). If there are bubbles in the diesel oil flowing out of the bleed screw, it means that air has leaked in the oil circuit. It is necessary to find out whether it is due to insufficient diesel in the fuel tank, or the oil pipe joint is loose or the oil pipe is ruptured, and the seals are not tight. . After troubleshooting, continue to pump oil with a hand oil pump or rely on the gravity flow of diesel until no bubbles are trapped in the diesel. Then tighten the bleed screw and the hand oil pump. If you feel that the oil is not smooth when pumping oil with a hand oil pump or relying on the gravity of diesel to flow, it means that there is a blockage in the low-pressure oil circuit. Check whether the diesel filter and low-pressure oil circuit are blocked. If there is a leak in the low-pressure oil circuit The oily place will also cause the oil to be poor. If it is found to be good after inspection, the fault lies in the oil transfer pump and should be disassembled for inspection. If there is no problem with the fuel transfer pump, the fault lies in the fuel injection pump.

  For combined fuel injection pumps, you can remove the side cover of the fuel injection pump at this time, place the throttle handle of the diesel generator set in the fuel stop position, and use a screwdriver to pry the plunger spring seat of the fuel injection pump to perform pumping action and check Whether the plunger spring is broken or the plunger is stuck. At the same time, it should also be checked whether the screw for adjusting the gear ring is loose, which causes the change in the oil supply. If it is good after inspection, it is necessary to check the degree of wear of the plunger and barrel and the leak tightness of the delivery valve.

[luo-lin-technology]

HMCF type fluorine lined magnetic force pump

HMFL/HMCF type fluorine lined magnetic force pump leakage prevention design canceles the shaft seal, uses the magnetic force coupling to drive indirectly, completely eliminates the trouble of drip leakage, never pollutes the use site.Due to the production of Jiangsu Weidekai Pump Technology Co., Ltd. lined with fluorine magnetic pump flow part of the selection of `fluorine plastic alloy` manufacturing.

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9 suggestions for maintaining a new oil pump

If the newly bought oil pump is not used in time, it should be filled with anti-rust oil, and the exposed surface should be coated with anti-rust grease, and then cover the oil port dust cap.

Want to make your newly bought oil pump more durable? 9 feasibility suggestions for you from the editor!

  1. If the newly bought oil pump is not used in time, it should be filled with anti-rust oil, and the exposed surface should be coated with anti-rust grease, and then cover the oil port dust cap.

  2. The regulating pressure of the safety valve should not be too high, generally 1.25 times the rated pressure of the pump.

  3. Keep the oil temperature in the range of 10℃-60℃, especially avoid high temperature continuous operation, otherwise the life of the oil pump will be greatly shortened. Install heaters and cooling devices if necessary.

  4. Keep the normal oil level high. An oil level gauge should be installed in the oil tank for frequent observation and refueling.

  5. The oil performance should be checked regularly, and the oil tank should be replaced and cleaned in time when the specified requirements are not met.

  6. The oil filter should be cleaned frequently to ensure that the oil is sucked in smoothly.

  7. After the oil pump has been working for a period of time, (due to vibration) the installation screws or the oil inlet and outlet valve screws may be loose. Pay attention to check and tighten them to prevent loosening.

  8. The maximum hydraulic impact force of the system shall not exceed 14Mpa.

  9. In order to clarify the temperature of the hydraulic oil, it is necessary to know the relationship between the working temperature of the oil in the oil tank (open circuit) and the temperature of the environment. The temperature of the leaking oil (case drain) is affected by the pressure and speed of the pump and is always higher than the temperature of the tank oil. However, the maximum temperature anywhere in the system must not exceed 90 degrees.

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FIEC type dilute acid pump

FIEC type dilute acid pump are horizontal, single stage, single suction, bracket type centrifugal pumps.At present, with the rapid development of smelting, petroleum and chemical industries, it is more and more urgent to transport strongly corrosive mortar pump with fine particle medium.

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CWB magnetic whirlpool pump

CWB magnetic whirlpool pump impeller is a disc, the circumference of the blade is uniformly arranged radially.An annular flow channel is formed between the pump body and the impeller, and the suction inlet and discharge outlet are in the outer circumference of the impeller.There is a baffle between the suction inlet and the discharge outlet, so as to separate the suction inlet and the discharge outlet.