Dosing pumps are special units whose function is to dose liquids circulating under pressure. Regardless of the design and manufacturer, the data pumping systems are an integral attribute in many areas of industry.
The dosing pump is driven by electric motor, powered by current using a magnetic element. In addition to the motor, the design of the dosing pump includes the following elements:
The adjusting mechanism is used to convert the torque generated by the drive shaft. The result of this is the generation of reciprocating motion of the piston. The design of the dosing pump also makes it possible to adjust the length of the piston stroke. A hydraulic cylinder is required to carry out the working process of the entire device.
The principle of operation of the pump is based on the suction of a certain dose of liquid, after which it is pushed into the dosage line.
By changing the length and stroke frequency of the devices, operators can set the required performance of the units. Moreover, the range of this indicator will be quite wide – from 5 ml/hour. up to 40 thousand l./h.
Dosing pumps can be used in a wide variety of applications. In this case, the units are divided among themselves according to modification, performance and type. Due to the large number of types of pumps, experts decided to divide the devices into three main types. The following systems can be found on sale:
Each of these types of equipment has found its application in specific areas. In everyday life, their operation is considered impractical due to the high cost of the units.
Wide functionality, high reliability and durability have made dosing pumps one of the most popular units in industry. Nowadays this equipment is successfully used:
Today it is quite difficult to find pumping equipment that could compete with dosing units in popularity. They are used almost everywhere where liquid supply in precise quantities is required.
These units consist of a pump and a drive. The role of the drive in the design is played by a gear motor and an electric motor.
The design of the units also includes a dual or single driving mechanism and one or two hydraulic cylinders.
Dosing pumps of this brand are most often used in the oil industry and chemical production.
Pumps of this brand have been found wide application when purifying large quantities of water. They cope well with collecting and pumping particularly large volumes of liquid.
These days, these pumps are also used in pharmaceuticals and food production. Among the advantages of devices of this brand are:
The disadvantages of pumps from this manufacturer include relatively high cost, making them unaffordable for some buyers.
The installation location of the units must meet the following requirements:
Provide free access to the unit during operation, as well as the ability to assemble and disassemble the units;
The mass of the foundation must be at least four times the mass of the units;
The units must only be installed in a horizontal position.
Reading time: 6 minutes.
The MTZ metering pump is an integral part of the tractor's hydrostatic control system. He is responsible for the correct distribution of fluid in the system and for its supply to the hydraulic cylinders. This strengthens the control system.
In this case, the operator needs to significantly less effort to turn the wheels. This point is of particular importance if the tractor is heavily loaded.
The MTZ metering pump is manufactured at the Minsk Tractor Plant. The manufacturer has simplified the design of the device as much as possible to ensure high wear resistance of the mechanisms and ease of maintenance. The device consists of three main components:
The swing unit of the device consists of several parts. It is represented by a stationary stator and rotor, to which the spool of the device extends. The spool, in turn, is fixed by two springs and connected to the steering column shaft. When the steering column moves, the spool also moves and, moving relative to the central axis, supplies oil inside the device.
The special valve block inside the housing includes anti-vacuum, safety, check and shock valves. Check valves systems are necessary in case of hydraulic motor failure. In this case, the valve closes the drain channel of the hydraulic booster system, preventing fluid circulation. Safety valves regulate the pressure inside the oil piping system.
Anti-vacuum valves are responsible for transporting oil inside the hydraulic cylinders when emergency situation in system. Shockproof ones regulate the pressure inside the lines under excessive load in case of work on uneven sections of the road.
A dosing pump is installed on equipment whose speed does not exceed 50 km/h. It is located in the volumetric hydraulic drive of the machine.
When acting on the control system, the metering pump supplies working fluid to the hydraulic cylinders, thereby enhancing the operator’s actions. If there is no impact on the control system, the pump is in neutral mode and passes liquid directly to the drain system.
Installing a metering pump on MTZ 80 and MTZ 82 involves a partial replacement of the power steering system (hydraulic steering) with a HPS (hydraulic steering) mechanism. The MOUNTAIN kit includes:
If necessary, a differential lock valve for the HPS mechanism is also purchased. It is used to replace the lock that is used on the power steering. Such a crane allows you to block the gearbox on unstable sections of the road, which increases the maneuverability of the equipment.
The dosing device is installed on the machine according to the following algorithm:
Replacement of the remaining HPS kit is carried out before installing the pump.
Any malfunction of the metering device or the volumetric steering system leads to complications in the operation of the control system. To restore the functionality of the system, you should clearly know which node has failed. There are a number of signs for this:
Also, one of the problems in the operation of the pumping equipment of the hydraulic booster circuit is its contamination. When the device's valves become clogged with dirt and other particles, they are unable to move fluid through the system and regulate pressure.
Device maintenance
Since the pump is not completely protected from dirt entering the system, it may become clogged. As a result, it must be washed periodically to prevent serious damage. This event takes place after complete disassembly devices. The pump must be washed with kerosene or a liquid with similar properties. Before you start washing, you must remove the rubber sealing rings from all parts. This will prevent them from being damaged. Each part is washed individually and very carefully. Special attention
should be given to the two bushings of the device. They are equipped with a series of small holes that get clogged quickly. After all the parts are washed, the device is assembled in the reverse order. Here important point is correct installation
gerotor pair and distributor leaf spring. The first part should be installed with the pump facing the holes away from you. The pair is installed in such a way that two teeth are located on a line in front of the master.
The MTZ metering pump is an integral part of the hydraulic volumetric complex that controls the tractor. It promotes proper distribution of fluid and its supply to the hydraulic cylinders, which, in turn, greatly simplifies tractor control.
1 What is the operating principle of the MTZ pump?
The oscillating unit of the pump contains several parts: a stationary stator and a rotor, to which the spool of the device fits. The spool is secured by 2 springs and connected to the steering column shaft. While moving, the steering column sets the spool in motion and, moving relative to the central axis, supplies oil inside the pump.
The special valve block of the housing contains anti-vacuum, safety, check and shock valves. Check valves are required in case of hydraulic motor failure. Then the valve closes the drain channel of the hydraulic booster system, interfering with the movement of fluid. Safety valves regulate the pressure in the oil pipeline system.
Anti-vacuum valves help move oil to the hydraulic cylinders during system failures. Anti-shock valves regulate the pressure in the lines under very heavy loads when driving along uneven areas tracks.
The dispenser pump must be installed on equipment moving at a speed of no higher than 50 km/h, and must be located in the volumetric hydraulic drive of the machine.
By influencing the control system, the dispenser pump supplies working fluid to the hydraulic cylinder and enhances the operator’s actions. If there is no influence on the control system, the position of the pump becomes neutral, and it passes liquid directly to the drain system.
When installing a metering pump on MTZ 80 and MTZ 82, partial replacement power steering (hydraulic steering) systems to HSC (hydraulic volumetric steering).
The MOUNTAIN kit includes:
If necessary, also buy a crane that blocks the differential of the HSC mechanism. It is used to replace the lock used on the power steering. This crane provides the ability to lock the steering wheel on unstable road sections, which improves vehicle maneuverability.
The rest of the HPS kit is changed before the unit is installed.
Any malfunction of the dispenser on MTZ 82 or the volumetric steering control system can cause complications in the functioning of the control system. To restore the functionality of the system, a clear understanding of what exactly has become unusable is necessary. This can be judged by the following signs:
Contamination of the hydraulic booster circuit can also cause a malfunction.
If the pump valves become clogged with dirt and other particles, they will not be able to move fluid through the system and regulate pressure. The result will be a decrease in the performance of the system, and it may break.
Reading time: 9 minutes.
Dosing pumps or, as they are called, dosing pumps are specialized units whose main purpose is dosing various liquids under pressure.
These can be clean, chemically neutral, aggressive, toxic liquids or emulsions, suspensions with different viscosities.
The most common application for metering pumps is in water treatment plants. All stages of water purification require constant precision. IN major cities water is treated with chlorine for the purpose of disinfection. Sometimes water is fluoridated, this has a beneficial effect on the growth of teeth in children.
Dispenser pumps are widely used in swimming pools (for example, fpvm dispenser pumps). With their help, sodium hypochloride is added to the water to maintain water chlorination. To control algae growth, metering pumps add a special chemical called an algaecide to the water of rivers and lakes.
Majority settlements have cleaning facilities Wastewater. For this purpose, lime mortar is added.
Dosing pumps are used in chemical and oil refineries, power plants and steam generators, and are also used in the food, cosmetics and pharmaceutical industries.
Dosing pumps are used in the plastics industry, ceramic products and in the steel industry.
For hygienic treatment In medical institutions, elbow dispenser pumps MID 01 are used.
The dosing pump (pump) consists of the following elements:
The electric motor is connected to a network with three-phase current. The adjustment device controls and regulates the stroke length of the piston. It also converts the torque of the drive shaft into reciprocating motion of the piston. The working process itself is carried out using a hydraulic cylinder.
The main function of the dosing pump is to suck in the required volume of liquid and push it into the dosing line.
Productivity depends entirely on needs and can range from 5-20 ml/hour to 40,000 l/hour.
Pump – dispenser LP and NDR
Due to the huge range of applications, LP dosing systems and pumps come in many varieties. They differ from each other in types, modifications and performance. Based on the design of low pressure metering pumps, they are divided into:
Depending on the type of drive, it can be mechanical or hydraulic. The largest area of application is the peristaltic dispenser pump.
It is used for dosing crystallizing elements, corrosive and viscous liquids. Peristaltic pumps (or hose pumps) are positive displacement units. Hoses for peristaltic pumps are the flow part through which liquid is forced. Peristalsis is achieved by mechanical pressure on the hose or tube.
The pumped liquid in the NP has restrictions - its temperature should be no more than 90 degrees and have a pressure in the range of 7-16 Bar.
Peristaltic pumps have two types depending on the elastic flow elements - tube or hose.
Tubes for peristaltic pumps are made from polymer materials. Thanks to this, they are quite strong, elastic, airtight and have high chemical resistance. Widely used in the food industry (food pump), since the tube material is chemically passive in relation to liquid. A dosing food pump is used in beer production. Honey dispenser pumps are indispensable for beekeepers; they are also a food pump.
Hose models are used for harsh reagents with many solid inclusions. The hoses are made of rubber and reinforced with reinforced inserts.
The design of the NP differs from most others due to the peculiarities of its operation. There is no need to install additional seals, since the pumped liquid is in contact only with the tubes.
They can be produced as individual hydraulic machines or as a monoblock with a drive and a reduction device.
The peristaltic pump has the following advantages:
The disadvantage is the frequent replacement of elastic elements and constant monitoring of them. Although replacing a tube or hose will cost much less than replacing a metal working part.
The most common areas of application of NP:
The peristaltic pump is used for dosing liquid fertilizers and salt solutions. It is also used for aerating water in freshwater and marine aquariums.
Stenner 45 MPH 10 is a popular representative of peristaltic pump dispensers, designed for high-precision dosing of various chemical reagents. The American company Stenner is reliable manufacturer quality mechanisms.
These are mechanically driven devices. They are used to move large volumes of liquid and to create strong pressure in an aggressive environment. They work with toxic and aggressive liquids with a density of up to 2000 kg per cubic meter.
A plunger dosing pump operates on the principle of moving a piston to create a vacuum or strong pressure. When a vacuum is formed, the system draws in liquid; when pumped, it is pushed out. Driving force The plunger is electrically driven. During operation, the moving mechanism does not come into contact with the inner plane of the working chamber.
The compatibility of the system materials and the working fluid must be taken into account.
Features:
All are divided into several types:
Diaphragm dosing pumps are positive displacement mechanisms. The main component and the only moving element in the structure is the membrane. Designed for pumping viscous and abrasive liquids, they have a long service life.
The membrane is driven by an actuator (pneumatic, mechanical or hydraulic). It has displacement and self-priming functions. Such installations can operate dry without harm.
Diaphragm LPs are designed to resemble a piston mechanism. The absorption process occurs as a result of vibration of the membrane. It is also a working chamber. As a result of filing compressed air into the air chamber, the liquid is displaced into the pressure pipeline. For a continuous flow of liquid, the system is equipped with two chambers connected to each other.
Diaphragm type dosing pumps have the following advantages:
The disadvantages include less accuracy in dosage, compared with plunger devices. The membrane has little strength and is often damaged. Not particularly high productivity and working pressure.
One of the most widely used models is Grundfos DMX. The DMX series has a wide the lineup and a large operating range. German DMX membrane dispensers are used for wastewater treatment, industrial applications, and water treatment. They have compact dimensions and are easy to install. The body of DMX models is made of chemical-resistant plastic.
Planetary pump dispenser NDP 500- hydraulic steering wheel. LP steering is designed to change the direction and change the flow of working fluids from the pump to the hydraulic cylinder for turning the wheels, in proportion to the angle of rotation of the drive shaft. And also for supplying fluid to the working element when the mechanism is not working.
Steering mechanisms use hydraulic injection pumps, dispensers and hydraulic cylinders.
To maintain heat in the cabin while the vehicle is moving, HydronikD5 WZ additional heaters are used. Installed as standard on diesel vehicles. D5 WZ does not preheat the cooling system before starting the engine.
For special equipment
For the HTZ and T-150 tractors, a steering dosing pump of the HKUS, HKUQ type is used, for the MTZ dosing pump D-100.
YuMZ tractors are modern equipment in great demand in agriculture. To make driving a tractor easier, an innovative element - a dispenser pump - appeared at YuMZ. For the conversion of the steering wheel, the following kits are offered: power steering, YuMZ dispenser pumps made in Bulgaria, L-shaped levers, fitting kits, high-pressure hoses, hydraulic tanks, brackets.
Installing a metering pump on the K 700 allows you to increase the controllability of a wheeled tractor on difficult sections of the road.
For the self-propelled chassis of the T 16 tractor, metering pumps will also become profitable investment. For this tractor, the XU series is used - 85-0/1, produced in Bulgaria.
Metering pumps on T 40 are installed brand XU 120-0/1. The main task of the Belarusian dispenser D 100-14.20-02 is to maintain the circulation of the working fluid in the hydraulic system and timely transport it to the cylinders of the rotary mechanism.
Metering pumps NDM-200-U-600 have a limitation - they are used for equipment with a maximum speed of 40 km per hour, such as the DZ 98 grader. It performs two functions - changing the direction of the flow of working fluid and increasing or decreasing its flow rate.
Installation on an imported T 25 ND is the most correct and cost-effective solution.
Soviet grain combines DON-1500 are the basic model of self-propelled machines of the DON brand. Hydraulic system consists of the main hydraulic system and the system that ensures the steering. It has the following components: gear valve, DON-1500 hydraulic steering wheel, flow amplifier, hydraulic cylinders, oil drive system.
There are specific codes for dosing pumps. For coding, the all-Russian classifier OKOF is used. There are the following subcategories of OKOF:
The most popular dosing pumps from the following manufacturers:
Etatron (Etatron) - the secret of the reliability of this manufacturer is multi-stage quality control of all elements.
Seko (Seko) is the leader of Russian production.
Grundfos is a German innovative manufacturer.
Injecta is an Italian company that produces unique dosing equipment.
Tapflo is the leader in the production of centrifugal pressure pumps.
