Development of throttle selector of significantly different pressures for gas-dynamic tools

Development of gas dynamic linear systems for setting low pressures

“…Thus, designing setting devices of the pressures different in magnitude, which could enable compensation for the impacts of obstacles and thereby could enable reducing errors of determining parameters of different gas-dynamic systems, should be considered promising. This, in particular, will enable solving the problem of changing stabilizers in the gas-dynamic system by pressure repeaters, which reproduce inter-throttle pressures of individual throttle circuit, which is not connected by gas flows with the main gas dynamic system [5,6]. This can be, for example, a subsystem of setting stabilized pressures, built on the basis of serial and parallel connection of capillaries.…”

“…Pressure dividers, particularly the capillary ones, in general are nonlinear systems, but choosing the design dimensions of their capillaries, as shown below, can provide the linearity of inter-throttle pressures Р j when changing the pressure at the input of divider P m . Linear dividers open up a prospect of improving characteristics of gas-dynamic systems, in particular, for preparation of complex mixtures due to compensation of the change in components consumption at the change of pressures at the inputs of dosing capillaries [5,16]. In this regard, further we will consider only linear capillary pressure dividers and the schemes based on them.…”

“…As a result, the system of equations for determining the dimensions (d j , l j ) of passable capillary channels will take the form [16]: According to results of the research into linear pressure dividers, it was found that the maximum value of division coefficient χ max as a rule does not exceed 30 and may be reached in a two-capillary divider only while it is slightly lower for multi-capillary ones [5].…”

“…To set the pressure drops, different in magnitude (at the level of several orders of magnitude), and ensure constant division coefficients, a scheme of cascade connection of linear multi-capillary dividers (i=1,…, n) is proposed, with arbitrary number of capillaries CE i, j , where j=1,…, m i [5,16].…”

“…To prepare complex multicomponent mixtures (for example, with micro-and nano concentrations of components) by the gas-dynamic method, substantially different pressure drops at the mixer's capillaries for various components should be provided [5]. That requires a whole system of various means to stabilize the pressure of components.…”