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The working principle, features and application of hydraulic motor
https://www.halieshydraulic.com/
The working principle of hydraulic motors
The hydraulic motor moves forward directly with the hydraulic starting rod, so the push rod itself does not rotate. The hook seat can be adjusted forward and backward directly with the thread. During operation, as long as the handle swings back and forth slightly, the hydraulic start lever moves forward, the hook correspondingly retreats, and the pulled object is pulled out. The new hydraulic motor is easy to operate and labor-saving. The three-claw type and the two-claw type can be disassembled and replaced according to the needs of on-site work
Features of hydraulic motors
The main features of hydraulic motors are high speed, small moment of inertia, easy starting and braking, and high sensitivity of speed regulation and reversing. Usually, the output torque of high-speed hydraulic motors is not large (only tens of N·m to hundreds of N·m), so it is also called high-speed small torque hydraulic motor. The basic type of high-speed hydraulic motor is radial piston type, such as single-acting crankshaft connecting rod type, hydraulic balance type and multi-acting inner curve type. In addition, there are also low-speed structural types in axial plunger type, vane type and gear type.
Application of hydraulic motors
Hydraulic motors, also known as oil motors, are mainly used in injection molding machinery, ships, hoists, construction machinery, construction machinery, coal mining machinery, mining machinery, metallurgical machinery, marine machinery, petrochemical, port machinery, etc. High-speed motor gear motor has the advantages of small size, light weight, simple structure, good manufacturability, insensitivity to oil pollution, impact resistance and low inertia, etc.
Jiangsu Kerai Hydraulic Pump Co., Ltd. is a high-end equipment manufacturer specializing in the production of high-pressure plunger pumps, motors, hydraulic reducers and spare parts.If you have your own opinions on the hydraulic motor, please contact Jiangsu Kerai Hydraulic Pump Co., Ltd.
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The working principle and application of charge pump
A charge pump is a DC-DC converter that uses a capacitor as an energy storage element, and is mostly used to generate an output voltage greater than the input voltage, or to generate a negative output voltage. The electrical efficiency of the charge pump circuit is very high, about 90-95%, and the circuit is quite simple.
The working principle of charge pump
The basic principle of the charge pump is to generate a high voltage through the accumulation effect of the capacitor on the charge, so that the current flows from a low potential to a high potential. Generally speaking, it is to charge the capacitor, remove the capacitor from the charging circuit to isolate the charged charge, and then connect it to another circuit to transfer the isolated charge.
Application of charge pump
1. A common application of charge pumps is RS-232 signal conversion ICs that can generate positive and negative voltages (mostly +10V and -10V) from a single 5V or 3V power supply.
2. Charge pumps can also be used in LCD or white LED driver circuits to generate high bias voltages from a single power source (eg, a battery).
3. Charge pumps are widely used in NMOS memory and microprocessors to generate a negative voltage VBB (about -3V) connected to the IC substrate (Substrate). This can ensure that the junction from N+ to the base layer has a reverse bias voltage of 3V or higher, which can reduce the junction capacitance and improve the speed of the circuit.
4. In the past, in Nintendo systems, some game cartridges that were compatible with Nintendo but not authorized by Nintendo would use a charge pump to generate voltage surges to confuse the Nintendo system lock chip.
5. As of 2007, almost all EEPROMs and flash memories have integrated charge pump circuits. This type of chip needs to use high-voltage pulses to clear the existing data in the block before writing a new value to the memory cell. Early EEPROM and flash memory required two power sources: +5V for reading data and +12V for clearing data. As of 2007, commercially available EEPROMs and flash memories require only one power supply, mostly 1.8V or 3.3V. The high voltage required to clear the memory block is generated by the charge pump in the chip.
6. In H-bridge circuits consisting of n-channel power MOSFETs or insulated gate bipolar transistors (IGBTs), the charge pump is also used in the gate driver of the high-side power elements of the H-bridge. When one of the center points of the H-bridge is at a low voltage, it will charge the capacitor through the diode, and then the charged charge will make the gate of the high side higher than the power supply voltage, so that the power element can be turned on. Assuming normal switching of the H-bridge, the above approach works fine, eliminating the need for a separate power supply and allowing the switch to use more efficient n-channel components. This type of circuit (requires periodic switching of high side power components) is also known as a bootstrap circuit and is sometimes somewhat different from a charge pump circuit.
Jiangsu Kerai Hydraulic Pump Co., Ltd. is a charge pump manufacturer specializing in the production of charge pumps, motors, hydraulic reducers and spare parts.If you have your own opinions on the charge pump, please contact Jiangsu Kerai Hydraulic Pump Co., Ltd.
https://www.halieshydraulic.com/
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Some knowledge of charge pumps
https://www.halieshydraulic.com/
Concept of Charge Pumps
A charge pump is a DC-DC converter that uses a capacitor as an energy storage element, and is mostly used to generate an output voltage greater than the input voltage, or to generate a negative output voltage. The electrical efficiency of the charge pump circuit is very high, about 90-95%, and the circuit is quite simple.
Fundamentals of Charge Pumps
The basic principle of the charge pump is to generate a high voltage through the accumulation effect of the capacitor on the charge, so that the current flows from a low potential to a high potential. In the basic implementation of this power conversion technique, the current (charge) is alternately switched and directed between the two capacitors, so the circuit output is twice the input, acting as a voltage-doubling boost converter. For these reasons, charge pump converters are also known as switched capacitor designs.
Advantages of Charge Pumps
1. High efficiency, compared with the inductive converter, the capacitor loses less energy;
2. Small size, less capacitors, diodes, auxiliary circuits, and charge pump peripheral devices are needed compared to inductance converters;
3. Low quiescent current; charge pump advantage
4. The minimum working voltage is lower;
5. Low noise, low electromagnetic interference. Because there is no high-speed transformation of the magnetic field, but only the high-speed charging and discharging process of the capacitor, the electromagnetic interference problem can be almost ignored; this is very useful for the EMC field.
Application of Charge Pumps
The charge pump circuit is mainly used in the voltage inverter, that is, the input is a positive voltage, and the output is a negative voltage. In electronic products, positive and negative power supplies or several different voltages are often required for power supply. For battery-powered portable products, increasing the number of batteries, It will inevitably affect the volume and weight of the product. Using a voltage inversion circuit can save a set of batteries in portable products. Since the operating frequency is 2~3MHz, the capacitance is small, and multi-layer ceramic capacitors can be used (low loss and low ESR), which not only improves efficiency and reduces noise, but also reduces the space of the power supply.
However, in the current market situation, the application of charge pumps technology are still limited, but in the case of future technological upgrading and innovation, charge pump will also be a good choice.
Jiangsu Kerai Hydraulic Pump Co., Ltd. is a charge pump manufacturer specializing in the production of charge pumps, motors, hydraulic reducers and spare parts.If you have your own opinions on the charge pump, please contact Jiangsu Kerai Hydraulic Pump Co., Ltd.
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Operating principle of the hydraulic pump
Hydraulic pump is a hydraulic element that provides pressurized liquid for hydraulic transmission, which is a kind of pump.Its function is to convert the mechanical energy of the power engine (such as motor and internal combustion engine) into liquid pressure energy.The output flow can be regulated according to the need is called variable pump, the flow cannot be regulated is called quantitative pump.
Operating principle of hydraulic pump: cam is driven by electric motor.When the cam pushes the plunger upward, the sealing volume formed by the plunger and the cylinder block decreases, and the oil extrudes from the sealing volume and exits through the one-way valve where needed.When the cam rotates to the falling part of the curve, the spring forces the plunger down to form a certain vacuum, and the oil in the tank enters the sealing volume under the action of atmospheric pressure.The cam makes the plunger constantly rise and fall, the sealing volume periodically decreases and increases, and the pump continues to absorb and drain oil.Hydraulic pump is the power component of the hydraulic system, is driven by the engine or motor, suction oil from the hydraulic tank, shape An element discharged into pressure oil and delivered to the actuator element.
The commonly used pumps in the hydraulic system are gear pump, blade pump and plunger pump.
Gear pump: small volume, simple structure, lax oil cleanliness, cheap price; but the pump shaft is unbalanced force, serious wear and large leakage.
Blade pump: divided into two-action blade pump and single-action blade pump.This pump has uniform flow, smooth operation, low noise, higher working pressure and volume efficiency than the gear pump, and the structure is more complex than the gear pump.
plunger pump: high volume efficiency, low leakage, working under high pressure, mostly for high power hydraulic system; but complex structure, high material and processing accuracy, expensive price and high cleanliness of oil.
The ger pump is generally used when the gear pump and blade pump can not meet the requirements.There are some other forms of hydraulic pumps, such as screw pumps, but the applications are not as common as the above 3.
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Working principle and precautions of hydraulic pumps
The hydraulic pump is the power component of the hydraulic system. It is driven by an engine or an electric motor, sucks oil from the hydraulic oil tank, forms the pressure oil and discharges it, and sends it to the actuator. Hydraulic pumps are divided into gear pumps, plunger pumps, vane pumps and screw pumps according to their structure.
The working principle of hydraulic pumps
The cam is rotated by the motor. When the cam pushes the plunger to move upward, the sealing volume formed by the plunger and the cylinder is reduced, and the oil is squeezed out from the sealing volume and discharged to the required place through the one-way valve. When the cam rotates to the descending part of the curve, the spring forces the plunger downward to form a certain degree of vacuum, and the oil in the tank enters the sealing volume under the action of atmospheric pressure.
Precautions for hydraulic pumps
1. When the hydraulic pump is started, it should be jogged several times. After the oil flow direction and sound are normal, run it under low pressure for 5 to 10 minutes, and then put it into normal operation. Before the plunger pump is started, the pump must be filled with clean working oil through the drain port on the casing.
2. The viscosity of the oil is affected by the temperature, and the viscosity of the oil increases with the increase of the oil temperature. Therefore, the oil temperature is required to be kept below 60 °C. In order to make the hydraulic pump work stably at different working temperatures, the selected oil should be It has oil temperature characteristics that the viscosity is less affected by temperature changes, as well as good chemical stability and anti-foaming properties.
3. The oil must be clean and must not be mixed with mechanical impurities and corrosive substances. The hydraulic system without a filter device on the oil suction line must be refueled to the fuel tank by an oil filter truck (filtering accuracy less than 25μm).
4. The maximum pressure and maximum speed of the hydraulic pump refer to the allowable peak value in a short period of time in use. Long-term use should be avoided, otherwise the life of the hydraulic pump will be affected.
5. The normal working oil temperature of the hydraulic pump is 15-65℃. The maximum temperature on the pump casing is generally 10-20℃ higher than the oil temperature at the pump inlet in the fuel tank. When the oil temperature in the fuel tank reaches 65℃, the upper The maximum temperature does not exceed 75 ~ 85 ℃.
Jiangsu Kerai Hydraulic Pump Co., Ltd. is a high-end equipment manufacturer specializing in the production of high-pressure plunger pumps, motors, hydraulic reducers and spare parts.If you have your own opinions on the hydraulic pumps, please contact Jiangsu Kerai Hydraulic Pump Co., Ltd.
https://www.halieshydraulic.com/
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The plunger pump is an important device in the hydraulic system. It relies on the reciprocating motion of the plunger in the cylinder body to change the volume of the sealed working chamber to achieve oil absorption and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow adjustment.
Working principle of plunger pumps
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The plunger pump is introduced on the principle of a plunger. There are two one-way valves on a plunger pump, and the directions are opposite. When the plunger moves in one direction, a negative pressure appears in the cylinder. At this time, a one-way valve opens and the liquid is sucked in. In the cylinder, when the plunger moves in the other direction, another one-way valve is opened after compressing the liquid, and the liquid sucked into the cylinder is discharged. This working method forms continuous oil supply after continuous movement.
Features of the plunger pump
Piston pumps are divided into two categories: radial piston pumps and axial piston pumps according to the arrangement direction of the pistons.
(1) Features of radial piston pump
① The plungers are arranged radially in the rotor, so the radial size is large, the rotational inertia is large, and the structure is complex.
②The plunger and the stator are in point contact, and the contact stress is high.
③The oil distribution shaft is affected by the radial unbalanced hydraulic pressure, which is easy to wear and tear. The clearance cannot be compensated after wear and the leakage is large. Therefore, the T pressure, volumetric efficiency and pump speed of this pump are lower than those of the axial piston pump. .
④ stator and turn. Eccentric installation, changing the eccentric distance e value can change the displacement of the pump, so the radial piston pump can be used as a variable pump. The eccentricity e of some radial piston pumps can be changed from a positive value to a negative value, changing the direction of the eccentricity, and the oil suction direction and oil discharge direction of the pump also change, becoming a bidirectional radial piston variable pump.
⑤ Determined by its characteristics, radial piston pumps are widely used in the main motion of hydraulic transmission of low-speed, high-pressure, high-power broaching machines, slotting machines and planers.
(2) Features of axial piston pump
①The plunger of the axial piston pump is installed axially, so the structure is compact, the radial size is small, and the moment of inertia is also small.
② It has high volumetric efficiency and can work at high speed and high pressure, so it is widely used in high pressure systems.
③ Change the size and direction of the inclination angle y of the swash plate of the plunger pump through the variable mechanism, and control the size of the reciprocating stroke of the plunger, thereby changing the output flow of the pump and the direction of oil suction and discharge.
④The axial size of the pump is large, the coaxial force of the pump is also large, and the structure is complex.
Jiangsu Kerai Hydraulic Pump Co., Ltd. is a high-end equipment manufacturer specializing in the production of high-pressure plunger pumps, motors, hydraulic reducers and spare parts.If you have your own opinions on the plunger pump, please contact Jiangsu Kerai Hydraulic Pump Co., Ltd.
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The working principle, classification and structure of hydraulic pump
The working principle of hydraulic pumps
The cam is driven to rotate by the motor. When the cam pushes the plunger to move upward, the sealing volume formed by the plunger and the cylinder body is reduced, and the oil is squeezed out of the sealing volume and discharged to the required place through the one-way valve. When the cam rotates to the descending part of the curve, the spring forces the plunger downward to form a certain degree of vacuum, and the oil in the tank enters the sealing volume under the action of atmospheric pressure.
Classification of hydraulic pumps
1. According to whether the flow can be adjusted, it can be divided into: variable pump and quantitative pump. The output flow can be adjusted according to the needs called variable pump, the flow can not be adjusted called quantitative pump.
2. According to the pump structure commonly used in hydraulic system, it is divided into three types: gear pump, vane pump and plunger pump.
Gear pump: small in volume, simple in structure, less strict on oil cleanliness, and cheaper in price; but the pump shaft is subject to unbalanced force, serious wear, and large leakage.
Vane pump: divided into double-acting vane pump and single-acting vane pump. This kind of pump has uniform flow, stable operation, low noise, higher working pressure and volumetric efficiency than gear pump, and more complicated structure than gear pump.
Plunger pump: high volumetric efficiency, small leakage, can work under high pressure, mostly used in high-power hydraulic systems; but complex structure, high requirements for materials and processing accuracy, high price, and high requirements for oil cleanliness.
The structure of hydraulic pump
The hydraulic pump consists of three parts: coupling, hydraulic oil tank and oil filter.
1. Coupling:
The hydraulic pump drive shaft cannot bear radial force and axial force, so it is not allowed to directly install pulleys, gears and sprockets on the shaft end, and couplings are usually used to connect the drive shaft and the pump drive shaft. If due to manufacturing reasons, the coaxiality between the pump and the coupling exceeds the standard, and there are deviations during assembly, the centrifugal force will increase as the pump speed increases, and the coupling will deform, and the large deformation will increase the centrifugal force. A vicious circle is created, which results in vibration and noise, which affects the service life of the pump. In addition, there are other influencing factors such as the loose coupling pin and not being fastened in time, and the wear and tear of the rubber ring not being replaced in time.
2. Hydraulic oil tank:
The main function of the hydraulic oil tank in the hydraulic system is to store oil, dissipate heat, separate the air contained in the oil and eliminate foam. When selecting a fuel tank, first consider its capacity. Generally, mobile equipment takes 2 to 3 times the maximum flow rate of the pump, and fixed equipment takes 3 to 4 times. Secondly, consider the oil level of the oil tank. When all the hydraulic cylinders of the system are extended, the oil level of the oil tank should not be low. At the lowest oil level, the oil level should not be higher than the highest oil level when the oil cylinder is retracted; finally, considering the structure of the oil tank, the diaphragm in the traditional oil tank cannot play the role of depositing dirt, and a vertical diaphragm should be installed along the longitudinal axis of the oil tank. There is a space between one end of the diaphragm and the end plate of the fuel tank so that the space on both sides of the diaphragm is connected, and the oil inlet and outlet of the hydraulic pump are arranged on both sides of the non-connected end of the diaphragm, so that the distance between the oil inlet and the oil return is the farthest. The hydraulic oil tank has more cooling effect.
3. Oil filter:
Generally, pollutants with a particle size of less than 10 μm have little effect on the pump, while those larger than 10 μm, especially above 40 μm, have a significant impact on the service life of the pump. The solid pollution particles in the hydraulic oil can easily aggravate the surface wear of the relatively moving parts in the pump. Therefore, it is necessary to install an oil filter to reduce the pollution degree of the oil. Filtration accuracy requirements: 10-15μm for axial piston pumps, 25μm for vane pumps, and 40μm for gear pumps. The pollution and wear of the pump can be controlled within the allowable range. At present, high-precision oil filters are widely used, which can greatly extend the service life of hydraulic pumps.
Jiangsu Kerai Hydraulic Pump Co., Ltd. is a high-end equipment manufacturer specializing in the production of high-pressure plunger pumps, motors, hydraulic reducers and spare parts.If you have your own opinions on the hydraulic pumps, please contact Jiangsu Kerai Hydraulic Pump Co., Ltd.
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