Deep-well pump with frequency conversion device

Abstract

The invention discloses a deep-well pump with the frequency conversion device. The pump comprises a pump assembly, a frequency conversion motor is connected to the pump assembly, and the frequency conversion motor comprises a motor shell, a frequency conversion motor assembly and the frequency conversion device. The motor shell is sealed end to end to form a motor cavity inside, and the variable frequency motor assembly is arranged in the motor cavity and used for driving the pump assembly to work. The frequency conversion device is arranged in the motor cavity and is connected with the frequency conversion motor assembly. The frequency conversion device comprises an installation shell and a frequency conversion circuit board. The head and the tail of the installation shell are sealed to form an installation cavity in the installation shell. The frequency conversion circuit board is arranged in the installation cavity, and the frequency conversion circuit board is provided with a frequency conversion module used for transmitting power frequency electricity to the frequency conversion motor assembly after frequency conversion. The built-in mode of the frequency conversion device isadopted, the frequency conversion device is not prone to being affected with damp and long in service life, the variable frequency motor assembly and the frequency conversion device are connected in the motor cavity, and the power utilization safety is high.

Description

technical field [0001] The invention relates to the technical field of water pumps, in particular to a deep well pump with a frequency conversion device. Background technique [0002] With the increase of population year by year, the shortage of water supply for people's livelihood is becoming more and more obvious. The water supply in many areas is not stable throughout the year, especially in the northwest region, where the drought is getting worse every year, and the use of groundwater is also increasing. The more widespread, the arid areas often find water sources very deep underground, and some powerful deep well pumps are especially needed to pump water for people to use. It can be seen that a deep well pump is a pump that is immersed in a groundwater well for pumping and transporting water. It is also widely used in farmland drainage and irrigation, industrial and mining enterprises, urban water supply and drainage, and sewage treatment. [0003] Among them, the deep...

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Problems solved by technology

[0003] Among them, the deep well pump is composed of a pump body and a motor. The motor drives the impeller in the pump body to rotate. Since the motors are all ordinary motors, it is difficult to improve the efficiency of the impeller due to the limitation of the speed. Therefore, it is necessary to equip a frequency conversion device to increase the speed of the motor.

[0004] However, the existing deep well pumps use an external frequency converter to achieve frequency conversion, and installing the frequency converter outside the pump body will inevitably lead to too many connected wire harnesses. During the pumping process of the deep well pump and the rain and fog in the natural environment, the frequency conversion The device is easy to be affected by moisture, and there is a potential safety hazard in using electricity

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