Multi-cylinder radial piston pump

Abstract

The invention relates to a multi-cylinder radial piston pump, comprising a pump body, an isolation tongue cover, a rotor, a rotor cover, pistons, an eccentric shaft, a connection rod, a vice connection rod, a connection rod pin, a bearing body, a shaft sealing device, an isolation tongue, a suction check valve and a discharge check valve. The eccentric shaft as an input shaft is supported on bearings at both ends, has stronger rigidity and radial force bearing capacity, and can be provided with a plurality of rows of the pistons along an axis. The rotor cover is provided with a radial channelconsisting of radial holes and a squeezing groove, the width of the radial channel is smaller than the width of the isolation tongue, and the sealing area of the isolation tongue is enlarged. When a motor drives the eccentric shaft to rotate, the connection rod fixedly connected with the eccentric shaft drives the rotor to rotate through the pistons. The pistons rotate and do reciprocation motiondue to the eccentric action. Liquid is inhaled from a suction chamber, and is discharged through a discharge chamber. The motion moves in cycles, and the liquid is continuously supplied. Because the number of the pistons is larger, the flow rate is increased, the discharge pressure is improved, the water flow is stable and has no pulse, the vibration is low, the noise is low, and the multi-cylinder radial piston pump is efficient and energy-saving.

Description

technical field [0001] The invention relates to a displacement pump, a multi-cylinder radial piston pump. Background technique [0002] Currently known volumetric reciprocating pumps are widely used due to their superior self-priming performance and high discharge pressure. However, due to the hysteresis of the valve, the reciprocating times of the piston cannot reach a high speed of more than 550 times per minute, so it must have Therefore, the deceleration mechanism appears to be complex in structure, bulky, high in cost, and the external liquid flow has pulse, vibration and noise, and is subject to certain restrictions in use; the newly emerging rotor-type piston pump without valve structure has attracted people's attention. , it has good self-priming performance, simple structure, small size, high reciprocating times, and can transport viscous liquids, such as the "rotor piston pump" of the invention patent ZL02112763.8, but the rotor pump has structural defects. The ec...

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Problems solved by technology

[0002] Currently known volumetric reciprocating pumps are widely used due to their superior self-priming performance and high discharge pressure. It cannot achieve a high speed of more than 550 times per minute, so it must have a deceleration mechanism, so it appears to be complex in structure, bulky, high in cost, and the external liquid flow has pulses, vibration and noise, and is subject to certain restrictions in use; new appearances The valveless rotor piston pump has attracted people's attention. It has good self-priming performance, simple structure, small volume, high reciprocating times, and can transport viscous liquids. For example, the "rotor piston pump" of the invention patent ZL02112763.8 "Yes, but the rotor pump has structural flaws. Its eccentric shaft adopts a simply supported beam support mechanism, that is, a cantilever mechanism. The radial force of the piston on the eccentric shaft is limited, and it is difficult to arrange more rows of pistons in the axial direction. Therefore, the increase of the flow rate and the increase of the discharge pressure are limited; the patent ZL99245734.3 "Shuttle Valve Rotor Pump" proposes a double-supported eccentric shaft structure. It is said that the efficiency can reach 98% at low pressure, and the efficiency at medium and high pressure can reach 75%, but one of the double supports of the eccentric shaft is on the rotating bearing, which is a floating eccentric support with limited support capacity; the patent ZL03212142.3 "Multiple Shuttle Valve Rotor Pump" also proposed a double-supported eccentric shaft structure , its stress situation has been greatly improved, and it can bear a large radial force, but the transmission mechanism becomes complicated, especially through the high-speed transmission of gears, and the noise and vibration increase accordingly; another common serious defect of the above three patents The wear of the friction pair is serious, especially when the load increases, the wear is intensified; because when the pump is in the suction stroke, the piston and the connecting rod generate a large centrifugal force on the eccentric shaft during high-speed operation, and when the pump is in the stroke, the piston on the piston The discharge pressure reacts on the eccentric shaft, aggravating the wear between the eccentric shaft and the connecting rod, and shortening the service life of the pump.

[0003] In addition, from the patent ZL99245734.3 "Shuttle Valve Rotor Pump", "at low pressure, the efficiency can reach 98%, and at medium and high pressure, the efficiency can reach 75%" It can be seen that the efficiency obviously loses 23% from low pressure to medium and high pressure, which shows that at medium and high pressure, there is a large loss of liquid backflow and volumetric efficiency in the sealing isolation between the high pressure chamber and the low pressure chamber.

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