SU651199A2 - Device for measuring volume of porous fibrous materials - Google Patents

Description

(wet) sokons, the pressure drop between the working and crushing vessels will also depend on the partial pressure of water vapor released by wet pupae. In practice, it is much more important to determine the silk-nesting live cocoons during the delivery and acceptance of cocoons by stockpiles at cocono-dryers and collection points.

In this device, containers are placed in a thermostat. In the process of measuring the volume of cocoons, a considerable time (up to 10 minutes) is spent on equalizing the temperature in the tanks after the air is passed from one container to another.

The purpose of the invention is to increase the accuracy and speed of measuring the volume of living cocoons.

This is achieved by the fact that an air dryer and a coil are inserted in the circuit between the filter and the auxiliary tank, the auxiliary and working tanks are equipped with temperature sensors, and the storage tank is krki.

The drawing schematically shows the proposed device.

A device for measuring the volume of porous fibrous materials consists of a compressor G, a receiver 2, filter 3, a dryer 4 and a coil 5, an auxiliary tank 6, a working tank 7 with a cover 8, a storage tank 9 with a cover 10 and a protective grid 11, valves 12, 13-15, pressure differential sensor 16 with measuring (pressure) measuring device 17, thermostat 18, temperature sensors 19 and 20 with measuring (temperature) measuring device 21.

Measuring the volume of live coco. performed as follows (option without using temperature sensors).

A working batch of 7 live cocoons is loaded into the working container 7, the silkiness of which is necessary to determine, and hermetically closed with a lid 8. Next, live cocoons from the same batch of the same weight as the working container are loaded into the storage container 9 and hermetically closed with a screw 10 and protective mesh 11. Valve 15 is closed and valves 12-14 are open, and atmospheric pressure P. is set in all containers.

Then the valve 13 is closed. After some time, the pressure in all containers increases slightly to the value of PO due to evaporation of moisture from living pupae. After that, the valves 12 and 14 are closed, the valve 15 is opened and the compressor 1 through the receiver 2, the filter 3, the air dryer 4 and the coil 5 heat the dried air with a temperature equal to the temperature of the thermostat in the auxiliary

tank 6. Naturally, in this case the partial pressure of moisture vapor in the auxiliary tank b does not change. The difference between the storage capacity 9 and the auxiliary capacity 6 is measured by a micro-differential sensor.

16 and register with the device 17. When a pressure drop of any value is reached, for example, 0.02 kgf / cm, the valve 15 is closed and the compressor 1 is turned off. A differential pressure is recorded between tanks 6 and 9:

DR .SZ)

The state of the system in this case can be described by the Clapeyron-Mendeleev equation for the auxiliary tank 6, volume V, and for the working tank 7 volume V2, respectively:

P ,. C4,) -fRT,

(five)

 where m and the mass of the gas in the volumes Y, and Vj, respectively;

M is a gram molecule of gas; 5 doo - the desired volume of cocoons;

T is the temperature in the thermostat.

Next, open the valve 14. The pressure in the tank 6 will decrease due to 0 part of the air flowing out of it into the working tank 7 and after some time a new pressure P g will be established in the containers 6 and 7 Then the Clapeyron-Mende5 equation for these containers will look like:

P, (V, .V.) A-i 2. u f

Sensor 16 detects the differential pressure:

AP P2-P. (7)

When substituting relations (4) and (5) into (6), we obtain:

P2 (V - V2-iV) (V2-uV) C8)

Hence, the expression for the desired volume of l V cocoons is as follows:

DR

..

(9)

With a known magnitude of the volumes of the auxiliary and working tanks V and Vg, respectively, as well as upon receipt of pressure drops

DR-R, -RO CDR R, -R

By means of sensor 16, using the above formula (9), it is possible to obtain the desired volume of control units of the cocoons.

Claims (1)

Consider the second option using temperature sensors. In this case, the time required for. measuring the volume of the sample cocoons will decrease. The whole measurement cycle passes as in the first variant only with the difference that the thermostat 18 is no longer used, and the temperature in the containers b and 7 is recorded by the temperature sensors 19 and 20 respectively Then equations (4), (5) and (b) will look like: w, - «, .. - (V, .V, -lVV Ьl ± nI R, and T are temperatures in volumes where T, V and V, respectively, before air bypass from tank b to work tank 7; T 2 - temperature in volumes V and V2 after bypassing. From equations (10), (11) and (12) of the required volume q V living cocoons receive the following expression: Av-v.-..- ii-И or taking into account ( 3) and (7): AV Vi + V2-V D P is easy to measure relative to atmospheric pressure P using another pressure micro-sensor. Other parameters, such as dP, dP, are measured by a pressure micro-differential sensor 16, T, T and T using temperature sensors 19 and 20. With a known value of V | and V. the desired volume of living cocoons can be obtained from formula (14). Introducing additional elements into the device, such as a lid for loading a storage tank with cocoons / mesh to separate the cocoons inside the storage tank from the pressure pressure differential sensor, silica gel vy dehumidifier coil and allow to measure the volume, and hence the living shelkonosnost cocoons reduce measurement error to 0.5%. The use of temperature sensors in the device makes it possible to make the device fast enough (one cycle of changes is less than 15 minutes). The invention The device for measuring the volume of porous fibrous materials according to ed. St. No. 492747, distinguished by the fact that, in order to increase the accuracy and speed of measuring the volume of living cocoons, an air dryer and a coil are inserted into the circuit between the filter and the auxiliary tank, the auxiliary and working tanks are equipped with temperature sensors, and the storage tank is covered with a lid. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 372454, cl. G 01 F 17/00, 1971,