SU1509834A1 - Flow rate stabilizer for multichannel gas samplers - Google Patents

Abstract

The invention relates to flow stabilizers and can be applied to devices for sampling and dosing air or gas samples in order to control their composition. The purpose of the invention is to increase the reliability of the sample being taken, while at the same time increasing the productivity. The device consists of a thermostat 1 with a heater 2, a housing 3 with input channels 4, each of which has a radiator, made in the form of a rod of component parts 5, and in series with it a flow setting element 6, an output channel 7 connected to a vacuum pump 8 In the output channel 7, a temperature sensor 9 is installed, electrically connected to the temperature controller 10, which is electrically connected to the heater 2 of the thermostat 1. Component parts 5 have cylindrical longitudinal grooves 11 (even a) and odd b) and ring e grooves 12. Components 5 are fastened to each other with a key and pivot. Above each annular groove 12 in the housing 3 is installed split washers 15 in the annular grooves 16. 3 Il.

Description

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The invention relates to flow stabilizers and can be applied to devices for sampling and dosing air or gas samples in order to control their composition.

The aim of the invention is to improve accuracy.

Figure 1 shows a flow stabilizer for multichannel gas samplers; figure 2 - section aa in fig.1; on fig.Z - section bb in figure 1.

The flow stabilizer for multichannel gas samplers consists of a thermostat 1 with a heater 2, a housing 3 with inlet channels 4, each of which has a radiator installed in the form of a rod 5 of component parts, and in series with it a setpoint for flow rate output channel 7 connected to a vacuum pump 8. A temperature sensor 9 electrically connected to a temperature controller 10 which is electrically connected to the heater 2 of the thermostat 1 is installed in the output channel 7. On the parts of the rod 5 there are cylindrical rodolnye groove 11 - and the even and odd b and annular groove 12. Parts of the rod 5, Art chickpeas between an axis 13 with the key 14. Above each annular groove 12 of the stem 5 within the housing 3 mounted slotted washer 15 in the annular groove 16 of the input channels 4.

The device works as follows.

When the vacuum pump 8 is turned on, an underpressure is created in the output channel 7, corresponding to the critical flow mode. The temperature controller 10 through the temperature sensor 9, installed in the output channel 7 using heater 2 of thermostat 1, maintains the specified temperature mode of the housing 3. The sample flow through the input channels 4 enters the radiator in the form of a rod 5 from components that are close to each other mounted on axle 13 with key 14, passes over their cylindrical

the flow of the grooves b c ngh washers 15, as well as the overall displacement of the ditch each other also

the longitudinal grooves 11 and the annular grooves 12, hitting the path of the protrusion of turbulence. Vizheni with split washers 15, installed in the annular grooves 16, and then passes through the elements 6 of the task flow. Each formula from

Stabilizer of national gas samples

Subsequent component 5, which forms a radiator, is turned relative to another by an angle which is equal to

a central angle formed by the sides of a smaller even parity groove a. This is due to the fact that when the next bushing is rotated at an angle oi, the flow of the sample passing into

the longitudinal groove a, strikes the body subsequent A qualitative shift occurs in the zone of the annular groove of the 12 sample streams coming out of the grooves a and b. Grooves b

may also partially overlap

each other, and the presence of a split washer 15 that breaks down the air flow also leads to an increase in flow turbulization, and consequently, to high-quality mixing. The presence of cylindrical longitudinal grooves 11 with unequal cross-sectional area makes it possible to create good stirring of the air or gas sample to be taken. The optimal ratio of the cross-sectional areas of the grooves a to the grooves b S, / 5, 1 / 1.5 - 1/30. Thus, the lower limit is due to the minimum difference in the flow rates of the samples in the grooves a and b at low vacuum pressures, i.e. when the sample flow rate is small and the flow is quite long in contact with the thermostatically controlled housing 3. Split washers 15 destroy a possible near-wall laminar flow that prevents high-quality heat transfer, at high flow rates you should intensively mix the sample being taken in order to obtain reliable results (the absence of a temperature gradient in the mass of air or gas leads to the identity of the samples taken in time). Rotation of the parts of the rod 5 relative to each other at an angle about at high flow velocities does not allow a high-speed flow from the grooves and skips without mixing along the length

input channel 4, beyond that,

The flux from the grooves b with the help of split washers 15, and also due to the partial displacement of the grooves b relative to each other, also has a high

stump turbulence.

stump turbulence.

Claims (1)

Invention Formula stump turbulence. A flow stabilizer for multichannel gas samplers containing a housing installed in a thermostat with inlet channels, each of which has a radiator and a flow target, are sequentially arranged, the radiator being made in the form of a rod with cylindrical longitudinal grooves, adjacent to which have different cross-sectional areas, and transverse grooves, characterized in that, in order to improve the accuracy of the stabilizer, the rod is made composite, with each part being installed so that The other grooves of the other part are shifted by an angle equal to the central angle formed by the edges of the cylindrical longitudinal groove with a smaller cross-sectional area, and the grooves in which the slotted the cross sections of the adjacent cylindrical transverse grooves are determined by the ratio S S ,, 5 ... 1/30, where S and the cross-sectional area, respectively, of even and odd grooves. / 4- / J Thebes. 2 Bb Fi.e