Large-range high-precision fluid adjusting device and method

Abstract

The invention discloses a large-range high-precision fluid adjusting device and method.The device comprises an input busbar with a fluid input end, an output busbar with a fluid output end, a plurality of sets of branches connected between the input busbar and the output busbar in parallel and a control module, and each set of branch is connected with an electromagnetic valve and a throttling valve in series; the electromagnetic valves of all the groups are controlled by a control module to be opened and closed respectively, all the groups of branches correspond to different bit weights step by step respectively, and the flow value of the throttle valve is set according to the bit weight of the branch of the group; during working, the control module adopts a control mode of stepping control and fine adjustment, and gradually adjusts, opens or closes branches with corresponding bit weights from large stepping to small stepping according to the set flow or pressure, so that the output flow or pressure gradually approaches a set value. A proportional valve is not needed, high-precision and large-range adjustment of fluid is achieved, combination is convenient, adjustment is flexible, and application is wide.

Description

technical field [0001] The invention belongs to the field of precision instruments, and in particular relates to a large-scale and high-precision fluid regulating device and method. Background technique [0002] In the field of precision instruments, devices that can achieve high-precision fluid adjustment are often required. For example, in minimally invasive surgery in the medical industry, the insufflation machine is the core equipment for abdominal minimally invasive surgery, and its fluid adjustment accuracy is very high. requirements. However, the current localization of high-precision fluid regulating devices such as insufflation machines has the following problems: [0003] 1. Domestic flow regulation is relatively extensive (for example, utility model patent 20062010527 discloses a method for making a fully automatic insufflation machine, using three flow valves 4L / min, 12L / min, and 14L / min to control the flow of the insufflation machine), However, similar foreign...

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Problems solved by technology

[0003] 1. Domestic flow regulation is relatively extensive (for example, utility model patent 20062010527 discloses a method for making a fully automatic insufflation machine, using three flow valves 4L / min, 12L / min, and 14L / min to control the flow of the insufflation machine), However, similar foreign products can already be finely adjusted at the level of 0.1L / min (for example, the German STORZ insufflation machine);

[0004] 2. Domestically, a method of using a proportional valve to adjust the flow rate of an insufflation machine has been proposed (for example, the invention patent CN201510234658.3 discloses a constant temperature and variable flow insufflation machine). Although this method can continuously adjust the gas flow rate, first, the domestic proportion The valve has not yet reached the level of industrial application, and foreign products need to be imported. Second, all current proportional valves cannot meet the wide range of fluid regulation.

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