1, the oil temperature is too high
(1)Ensuring the cooling effect of the cooler The cooling method of the air compressor pressure sensor is different on different machines. For example, the air compressor pressure sensor on a mobile air compressor adopts air cooling, while the air compressor on the variable frequency air compressor Press pressure sensors use water cooling. For an air-cooled air compressor pressure sensor, the radiator must be kept clean; for a water-cooled air compressor pressure sensor, if the air compressor is too hot, the cooling effect will be poor. When the air compressor pressure sensor works, both the pump wheel and the turbine rotate at high speed, and the friction with the oil of the air compressor will generate a lot of heat to cause the oil temperature to rise; in order to ensure the normal oil temperature during the work, the pressure in the air compressor pressure sensor must be heated. The special oil for the air compressor flows out part of the air compressor and at the same time enters a part of the cooled air compressor oil.
At the bottom of the air compressor pressure sensor housing is a fuel tank. The special oil for the air compressor in the circulating circle flows back to the tank from the outlet pressure valve. After the hydraulic pump sucks the oil from the mailbox, it flows back through the oil filter and the radiator. Inside the circle for cooling compensation.
If the inlet pressure valve is improperly adjusted, when the oil pressure is low, a large number of condensed bubbles will appear in the front section of the impeller in the pump impeller, which will reduce the efficiency of the air compressor pressure sensor and increase the oil temperature.
Air compressor pressure sensor outlet pressure valve If the pressure is too high, the cooler oil will be insufficient and the oil temperature will increase.
For different models, the inlet and outlet pressures of the air compressor pressure sensors are also different. For example, the pressure of the inlet pressure valve of the air compressor pressure sensor of the inverter type air compressor is 870 kPa, and the pressure of the outlet pressure valve is 450 kPa.
(2) The air compressor pressure sensor should have enough oil, good quality to ensure good hydraulic air compressor pressure sensor power loss is 20% to 25% of the air compressor rated power, these power will be converted into heat to make the working oil temperature Therefore, there must be enough oil to absorb this heat and dissipate it to cool it in time. For this reason, various machines have clearly stipulated how much oil they have, and drivers must diligently check and diligently supplement them.
Oil must be used to change the torque, if the viscosity of the oil is too large, will be the pump wheel to the turbine speed of the oil to reduce, resulting in increased oil temperature, while increasing the air compressor pressure sensor operating wheel churning losses, It also raises the oil temperature.
(3) Controlling the stall During the construction process of the mobile air compressor and the variable frequency air compressor, the external resistance is difficult to predict, and often the sudden load cannot be overcome, which will inevitably cause the failure of the hydraulic pressure sensor. Under the stall condition, the input power of the air compressor pressure sensor will be converted into heat energy, which will increase the oil temperature of the air compressor pressure sensor, leading to early aging of various seals of the air compressor pressure sensor, and reduced life expectancy. . Therefore, when the driver operates the machine, it is important not to make it run at high speed for a long time.
2, lack of power (1) the air compressor pressure sensor in a certain range of speed using the air compressor pressure sensor in the case of stall, the transmission efficiency η is zero, the air compressor to supply the kinetic energy of the air compressor pressure sensor All are converted into a churning oil loss, ie thermal energy, so that the pressure of the air compressor pressure sensor rises. Therefore, stall conditions must be avoided during use. According to the characteristic curve of the air compressor pressure sensor, there is only one highest point of transmission efficiency. It can be seen that it is not free to change gears at will, but it must be used within a certain speed range, otherwise its transmission efficiency is quite low.
(2) Precautions for practical operation When driving a machine with hydraulic transmission, it is necessary to change the speed according to the load. It is advisable to place the throttle of the air compressor close to the rated speed, such as the long-term operation and low efficiency area of ​​the air compressor pressure sensor. Not only will it cause a waste of oil and time, but it will also lead to an increase in oil temperature. Therefore, the correct operation of the machine is to use a large throttle, shift gears, and pay attention to the working oil temperature and oil pressure of the air compressor pressure sensor, so that the machine can work near the high efficiency area of ​​the air compressor pressure sensor.
(3) Periodically detect the pressure of the air compressor pressure sensor of the torque-changing hydraulic pump determines the operating power of the air compressor pressure sensor. The construction machinery equipped with air compressor pressure sensor is specially equipped with a torque-reducing hydraulic pump, which acts as a "heart" in the torque-changing oil circuit, and provides the necessary pressure-changing oil to the air compressor pressure sensor. Therefore, it is necessary to regularly test whether the technical indicators of the torque-changing hydraulic pump meet the standards.
(4) Improve the installation accuracy of maintenance The pump wheel and the turbine of the air compressor pressure sensor are parts that rotate at a high speed. During the manufacturing process, the balance test was performed. The static unbalance degree must not exceed 15 g·cm; therefore, during maintenance and installation Do not use bolts of varying lengths to connect the pump wheel and the turbine to avoid damaging its smoothness and causing power loss. In addition, when the pump wheel and the turbine are in operation, the swinging amount of the end face also affects the transmission efficiency. The swing of the connecting end of the casing and the pump wheel during manufacturing should not be greater than 0, 06 mm; the pump bearing seat end face, the turbine contact plate end face, and the air pressure The oscillating difference between the connecting end surface of the pressure sensor housing and the bearing housing is not greater than 0,02 mm. When installing, they must be carefully inspected and these ends should be cleaned so as not to affect the swing.
(1)Ensuring the cooling effect of the cooler The cooling method of the air compressor pressure sensor is different on different machines. For example, the air compressor pressure sensor on a mobile air compressor adopts air cooling, while the air compressor on the variable frequency air compressor Press pressure sensors use water cooling. For an air-cooled air compressor pressure sensor, the radiator must be kept clean; for a water-cooled air compressor pressure sensor, if the air compressor is too hot, the cooling effect will be poor. When the air compressor pressure sensor works, both the pump wheel and the turbine rotate at high speed, and the friction with the oil of the air compressor will generate a lot of heat to cause the oil temperature to rise; in order to ensure the normal oil temperature during the work, the pressure in the air compressor pressure sensor must be heated. The special oil for the air compressor flows out part of the air compressor and at the same time enters a part of the cooled air compressor oil.
At the bottom of the air compressor pressure sensor housing is a fuel tank. The special oil for the air compressor in the circulating circle flows back to the tank from the outlet pressure valve. After the hydraulic pump sucks the oil from the mailbox, it flows back through the oil filter and the radiator. Inside the circle for cooling compensation.
If the inlet pressure valve is improperly adjusted, when the oil pressure is low, a large number of condensed bubbles will appear in the front section of the impeller in the pump impeller, which will reduce the efficiency of the air compressor pressure sensor and increase the oil temperature.
Air compressor pressure sensor outlet pressure valve If the pressure is too high, the cooler oil will be insufficient and the oil temperature will increase.
For different models, the inlet and outlet pressures of the air compressor pressure sensors are also different. For example, the pressure of the inlet pressure valve of the air compressor pressure sensor of the inverter type air compressor is 870 kPa, and the pressure of the outlet pressure valve is 450 kPa.
(2) The air compressor pressure sensor should have enough oil, good quality to ensure good hydraulic air compressor pressure sensor power loss is 20% to 25% of the air compressor rated power, these power will be converted into heat to make the working oil temperature Therefore, there must be enough oil to absorb this heat and dissipate it to cool it in time. For this reason, various machines have clearly stipulated how much oil they have, and drivers must diligently check and diligently supplement them.
Oil must be used to change the torque, if the viscosity of the oil is too large, will be the pump wheel to the turbine speed of the oil to reduce, resulting in increased oil temperature, while increasing the air compressor pressure sensor operating wheel churning losses, It also raises the oil temperature.
(3) Controlling the stall During the construction process of the mobile air compressor and the variable frequency air compressor, the external resistance is difficult to predict, and often the sudden load cannot be overcome, which will inevitably cause the failure of the hydraulic pressure sensor. Under the stall condition, the input power of the air compressor pressure sensor will be converted into heat energy, which will increase the oil temperature of the air compressor pressure sensor, leading to early aging of various seals of the air compressor pressure sensor, and reduced life expectancy. . Therefore, when the driver operates the machine, it is important not to make it run at high speed for a long time.
2, lack of power (1) the air compressor pressure sensor in a certain range of speed using the air compressor pressure sensor in the case of stall, the transmission efficiency η is zero, the air compressor to supply the kinetic energy of the air compressor pressure sensor All are converted into a churning oil loss, ie thermal energy, so that the pressure of the air compressor pressure sensor rises. Therefore, stall conditions must be avoided during use. According to the characteristic curve of the air compressor pressure sensor, there is only one highest point of transmission efficiency. It can be seen that it is not free to change gears at will, but it must be used within a certain speed range, otherwise its transmission efficiency is quite low.
(2) Precautions for practical operation When driving a machine with hydraulic transmission, it is necessary to change the speed according to the load. It is advisable to place the throttle of the air compressor close to the rated speed, such as the long-term operation and low efficiency area of ​​the air compressor pressure sensor. Not only will it cause a waste of oil and time, but it will also lead to an increase in oil temperature. Therefore, the correct operation of the machine is to use a large throttle, shift gears, and pay attention to the working oil temperature and oil pressure of the air compressor pressure sensor, so that the machine can work near the high efficiency area of ​​the air compressor pressure sensor.
(3) Periodically detect the pressure of the air compressor pressure sensor of the torque-changing hydraulic pump determines the operating power of the air compressor pressure sensor. The construction machinery equipped with air compressor pressure sensor is specially equipped with a torque-reducing hydraulic pump, which acts as a "heart" in the torque-changing oil circuit, and provides the necessary pressure-changing oil to the air compressor pressure sensor. Therefore, it is necessary to regularly test whether the technical indicators of the torque-changing hydraulic pump meet the standards.
(4) Improve the installation accuracy of maintenance The pump wheel and the turbine of the air compressor pressure sensor are parts that rotate at a high speed. During the manufacturing process, the balance test was performed. The static unbalance degree must not exceed 15 g·cm; therefore, during maintenance and installation Do not use bolts of varying lengths to connect the pump wheel and the turbine to avoid damaging its smoothness and causing power loss. In addition, when the pump wheel and the turbine are in operation, the swinging amount of the end face also affects the transmission efficiency. The swing of the connecting end of the casing and the pump wheel during manufacturing should not be greater than 0, 06 mm; the pump bearing seat end face, the turbine contact plate end face, and the air pressure The oscillating difference between the connecting end surface of the pressure sensor housing and the bearing housing is not greater than 0,02 mm. When installing, they must be carefully inspected and these ends should be cleaned so as not to affect the swing.
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