Electric-hydraulic proportional plunger pump

Abstract

The invention discloses an electric-hydraulic proportional plunger pump, which belongs to the technical field of plunger pumps, and comprises a plunger pump body and a control device for adjusting pump displacement. The plunger pump body comprises a bearing and a central rod used for connecting the bearing and the control device and provided with an axial line forming an included angle with an axial line of the bearing; a plurality of plungers connected with the bearing are arranged around the central rod; the control device comprises an electromagnet, a displacement and feedback force systemand a control valve element for connecting the electromagnet and the displacement and feedback force system; and an oil distribution disc for installing the central rod is arranged on the displacementand feedback force system. The invention provides the plunger pump which has the displacement capable of being adjusted from zero to maximum infinitude, and is convenient to adjust, higher in rotaryspeed and stain resistant.

Description

technical field [0001] The invention relates to the technical field of plunger pumps, in particular to an electro-hydraulic proportional plunger pump. Background technique [0002] The domestic type similar plunger pumps currently on the market, the structure of the control device (such as Figure 7 As shown) is relatively complicated, the electromagnet 7' is energized to generate thrust, and a very long push rod 4' is used to push the valve core 3', thereby controlling the displacement of the piston 1' and driving the shift fork 2'; at the same time, it is necessary to adjust Adjust the length of the rod 6' to adapt to the distance of the push rod 4'. In addition to the balance of the feedback spring 5', the thrust of the electromagnet 7' must also overcome the gravity of several parts such as the push rod 4', which is prone to vibration during use (electromagnetic The maximum thrust of iron 7' ​​is 80N), which causes variable instability, and the feedback spring 5' for det...

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Problems solved by technology

[0002] The domestic types of similar plunger pumps currently on the market, the structure of the control device (such as Figure 7 As shown) is relatively complicated, the electromagnet 7' is energized to generate thrust, and a very long push rod 4' is used to push the valve core 3', thereby controlling the displacement of the piston 1' and driving the shift fork 2'; at the same time, it is necessary to adjust Adjust the length of the rod 6' to adapt to the distance of the push rod 4'. In addition to the balance of the feedback spring 5', the thrust of the electromagnet 7' must also overcome the gravity of several parts such as the push rod 4', which is prone to vibration during use (electromagnetic The maximum thrust of iron 7' ​​is 80N), resulting in variable instability, and the feedback spring 5' that detects the displacement of piston 1' does not directly act on piston 1', but indirectly, and there are many parts in the mechanism, which increases vibration and instability factors

[0003] Moreover, the displacement adjustment of the existing control device cannot be adjusted steplessly from zero to the maximum displacement. When the system is not working, the pump will always output a small displacement, which returns to the oil tank through the control valve, causing the system to heat up. Energy waste, due to structural defects, the working pressure cannot reach the rated 30Mpa or more, and the linearity of the displacement to the control current is not good; although the plunger pumps of similar types abroad can be adjusted steplessly from zero to the maximum displacement, their anti-pollution ability Poor, high requirements on oil quality, easy to damage, and expensive maintenance

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