Composite pump with small pump conducting strong flow return and big pump conducting small-quantity ejection

Abstract

A composite pump with a small pump conducting strong flow return and a big pump conducting small-quantity ejection comprises the big pump and the small pump which are each of a piston structure, and acontrol valve, wherein according to the big pump and the small pump which are each of the piston structure, the bottom end of an outlet in a big pump cavity body is provided with a small pump cavitybody, the end face of a big piston in the big pump cavity body stretches out of a small piston, the small piston and the small pump cavity body form the small pump, and the big pump and the small pumpform the composite pump; and the control valve comprises a valve body and a valve core, the valve body is internally provided with a valve core cavity body containing the rotary valve core, and the valve core is arranged in the valve core cavity body. According to the composite pump, in the ejection step, a large-quantity ejection channel and a small-quantity ejection channel are unchoked throughthe strong pressure, in the implementation step, supplementation can be conducted in time when the interior of the composite pump is vacuum, and the situation that the interior of the composite pumpwaits a long time for being subjected to vacuum filling is avoided.

Description

technical field [0001] The invention relates to the technical field of paint toning, in particular to a small-pump strong backflow large-pump injection small-volume compound pump. Background technique [0002] There are pump and valve structures already produced by our company, including large and small pumps with a plunger piston structure, valves for controlling the flow channels of large and small pumps, and a small pump cavity is installed at the bottom of the outlet of the large valve cavity, and extends inside the large pump cavity. A small piston is produced, and the small piston and the small pump cavity form a small pump, and the large pump and the small pump form a composite pump. The valve that controls the circulation of the large and small pumps includes such a flow structure. After the color paste pumped by the compound pump passes through the large amount of injection channel and the small amount of injection channel of the valve core, it is collected into the...

AI Technical Summary

Problems solved by technology

However, when encountering a viscous fluid, when the compound pump injects the step, that is, when the valve core is in the initial position of closing the color paste injection, the color paste in the color paste bucket can be sucked into the compound pump or discharged from the compound pump. Press the color paste back into the color paste bucket, a considerable part of the viscous liquid flows back to the color paste bucket from the short circuit, but the viscous color paste does not pass through completely, or does not pass through a large number of injection channels and a small amount of injection channels state, which reduces or loses the anti-blocking effect of a large number of injection channels and a small amount of injection channels, so there is a risk of blockage of a large number of injection channels or a small amount of injection channels

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