General failures and treatments of centrifugal pump (IV)

General failures and treatments of centrifugal pump (IV) 1. Seal fever Causes and treatment methods are as follows: (1) Packing too tight or friction. Approach is to relax the packing, check the seal tube. (2) The seal ring and seal tube dislocation. Approach is to re-check the alignment. (3) Washing, cooling is good. Approach is to check the flush cooling circulation tubes (4) Mechanical seal failure. Approach is to check the mechanical seal. 2. Rotor runs largely Causes and treatment methods are as follows: (1) Improper operation, operating conditions away from the pump design conditions. Treatment: strict operation, the pump is always running around the design conditions. (2) The balance is not smooth. Approach is to clear the balance pipe. (3) The balance disc and seat material balance disc undesirable. Approach is to replace the material meets the requirements of balance disc and balance disc holder. 3. The water hammers Causes and treatment methods are as follows: (1) Due to a sudden power failure, causing the system pressure fluctuations, occurs vacuum exhaust system, air bubbles dissolved in the liquid or escape of the gear pump in the gas pipeline memory. Approach is the gas drained. (2) High-pressure liquid column due to the rapid intrusion of a sudden power failure, the impact at the pump outlet check valve plate. Approach is unreasonable pump exhaust system pipes, pipe fittings arranged to be transformed. (3) Close the valve outlet pipe too quick. Approach is to slowly close the valve. Honghaipump.

Thermal Oil Pump-Common Ways to Remove Breakdowns

Thermal Oil Pump-Common Ways to Remove Breakdowns Currently, CB-B type gear pumps are widely used in the dump truck and construction machinery, now Honghai Pumps explains the common faults and exclusion methods as below, for reference only. 1. Reasons of vibration and noise, and exclusion methods. (1) Intake air ①As for CB-B type gear pump, the pump body and both sides cover is hard seal direct contact, if the flatness of the contact surfaces do not meet requirements, the pump easily inhaled air at work; Similarly, between the pump cover and the cap, which is also direct contact, the air is easily penetrated; if the lid is plastic, due to its damage or deformation due to temperature changes, the air is easy penetrated caused by leaky seal. To exclude this failure, the method is: when the flatness between the pump body and pump cover doesn’t meet the requirements specified, you can use emery to grind the plate back and forth by shape route, otherwise use grinding surface grinder to make flatness not more than 5 μm; for leakage between the cover and lid, it’s suggested to use an epoxy resin or other adhesive for sealing. ② Skeleton type sealing is generally used for the shaft seal. If the spring off, or the oil seal backward, or lips were strained, aging, all the above situations will make the rear end seal often in negative state , thus to intake air, a new seal should be replaced and the problem solved. ③ Not enough fuel in the tank, or the suction nozzle is not plugged in to the oil below the surface, the pump will draw air into the fuel tank and you should replenish oil to the oil marking; if the return pipe mouth exposed oil, sometimes due to the negative pressure within the system instantly leaving air anti-irrigation into the system, so the return line ports generally should be inserted into the oil below the surface. ④ Pump mounting position from the oil is too high, especially when the pump speed is reduced, because they can’t ensure the pump suction cavity caused by lack of the necessary degree of vacuum suction and thus intake air. You should adjust the relative height of the pump and the oil so that it meets the requirements. ⑤ Oil filter is clogged dirt or capacity is too small, resulting in an increase in the intake air suction resistance; in addition, into the larger diameter oil port may also be brought into air. At this point, washable filter, or select a larger capacity, and the export path appropriate filter. In this way, it not only can prevent the inhalation of air, but also prevent the generation of noise. There are other reasons like mechanism reason, heating or output flow problem, we will explain in our coming article. Honghai Pump Co., Ltd.

The Reason Why Gear Pump Does Not Run Smooth

1. Axial or radial clearance gap is too small to be adjusted again repair. 2. There is dirt inside the pump, in order to remove foreign bodies disintegrated. 3. The assembly is incorrect, gear oil pump two pin hole machining datum not assemble planes, such as the pin into the first, and then tighten the screw, the pump will not turn. 4. Coupling concentricity bad pump and motor, should ensure concentricity within 0.01mm. 5. No demagnetization honghai pump parts, all parts before assembly require demagnetization. 6. Needle roller sets the quality standard, or broken, repaired or replaced. 7. The pump outlet is blocked, remove foreign bodies. Gear Pump is a lightweight real-time big data streaming engine. It is inspired by recent advances in the Akka framework and a desire to improve on existing streaming frameworks. The name hot oil pump is a reference to the engineering term “gear pump,” which is a super simple pump that consists of only two gears, but is very powerful at streaming water.

KCB series stainless steel magnetic pump

KCB series stainless steel pump advantage is zero leakage, compact structure, beautiful appearance, small size, low noise, reliable, easy to use. It can be widely used in chemical, pharmaceutical, petroleum, electroplating, food, film photofinishing, research institutions, defense industry and other units pumping acid, lye, oils, rare and precious liquid, venom, volatile liquid, and circulating water equipment, filter support. Particularly susceptible to leakage, flammable, explosive liquid substance pumping, this pump is more ideal choice. KCB series stainless steel magnetic pump magnetic pump (temperature ≤250 ℃) (referred to as magnetic pump) is applied to the working principle of permanent magnet coupling gear pump new products, the main material is stainless steel. Reasonable design, advanced technology, with fully sealed, no leaks, corrosion-resistant features, its performance has reached the advanced level of similar products. Magnetic pump to replace the static seal dynamic seal, the pump flow components in a completely sealed state, solve the other pump mechanical seal cannot avoid the run, drop oil the drawbacks. Magnetic pump corrosion-resistant, high-strength engineering plastic, corundum ceramics, stainless steel and other materials for manufacturing, so it has good corrosion resistance, and can be transported from medium pollution. Honghai pump.

ZYB Series Booster Fuel Pump

ZYB Series Booster Fuel Pump
Advanced structure 
small volume 
big capacity 
low noise 
long service life

Honghai ZYB series booster fuel gear pump is our company developed new type product. At present domestic fuel oil alternative products, product quality is uneven, common fuel pump or pump imported already can not adapt to the situation,In view of the situation, our company according to international advanced level and the actual situation of domestic fuel, designed the this new product. After many users use, the effect is very significant, successfully replaced the imported products and the ordinary pump products

(1) ZYB series the ignition fuel pump, booster fuel gear pump suitable for transferring diesel, heavy oil, residual oil, fuel oil and medium can be used for fuel. Especially suitable for road and bridge engineering mixing station and power plant burners of the fuel pump. The product has the characteristics of high hardness, wear resistance, adjustable pressure. It is ideal product for replacing the import pump. According to different burners’s features in different country, this product have two types: 4.0Mpa and 2.5Mpa.Seal have graphite sealing and mechanical seal for customer’s choice.

(2)ZYB series booster fuel pump is not suitable for transferring highly volatile or low flash point of the liquid, such as ammonia, benzene, etc.

(3)ZYB series booster fuel pump if transfer liquid such as gasoline, must indicate in order.

(4) Winter construction, in order to prevent the transmission of oil solidification causes the damage of the fuel pump, our factory also produces BZYB series insulation booster pump, heating medium can use thermal oil, steam or hot water.

Transfer gasoline, diesel, heavy oil，residual oil, fuel oil
Capacity:3-800m3/h

Would you like to know products, please check http://www.chinaoilpumps.com/products/.

 

Solution of entrap phenomenon of Gear Pump

Solution of entrap phenomenon of Gear Pump

As for gear pump , in order to work smoothly, the gear meshing of the coincidence degree must be greater than 1, so there are always two pairs of gears mesh at the same time, and some of the oil is trapped between two pairs of teeth surrounded by a closed cavity.

The close cavity started to decrease gradually as the gears rotate, then gradually increase. Closed chamber will reduce, which will extrude the trapped oil and cause high pressure, and then the oil will be extruded from the gap, resulting in heating oil, which will cause extra load for the spare parts; While at the same time, the closed cavity volume increases and caused a partial vacuum, so that the gas dissolved in oil separation, which causes a sudden formation. All of these above will cause a strong vibration and big noise, this is called entrap phenomenon.

The harm
When the gear oil pump radial unbalanced force is large, the shaft will be bended, and the tooth top contact with the casing, which will accelerate the bearing wear and reduced the bearing life.

The method of eliminating
The common method to eliminate the entrap phenomenon is to open the unloading groove on both sides of the cover plate, so that the closed cavity volume decreases by unloading groove and pressure oil cavity discharge on the left, the volume increases by the right side of the unloading groove and communicated with the oil absorption cavity.

Honghai will explain more info of using gear pumps and the related instructions. Keep focusing on our news and we will update soon.