RU2423675C1 - Metallic indicating measuring tape - Google Patents

Abstract

FIELD: physics. ^ SUBSTANCE: measuring tape is fitted with an indicator consisting of an electronic circuit connected through contacts with a measuring tape and a reservoir housing. If there is water in between, the circuit closes and the light-emitting diode of the indicator lights up. In order to detect presence of water, the measuring tape load is lowered to the bottom of the reservoir and the height on the tape is recorded. The boundary surface of media is determined by switching off of the light-emitting diode when the load is taken out of the reservoir in backward motion. ^ EFFECT: high accuracy of measuring the level of water under a product with low material and time consumption. ^ 4 dwg

Description

Roulette refers to a control and measuring technique, namely, devices for measuring the parameters of liquid media, in particular, such as the level and boundaries of phases in two-phase media, determining the level of produced water, and can be used in various industries on vertical metal tanks for mining processing and use of oil and petroleum products. A device is known for controlling the interface between media (USSR AS No. 1515062, MKI G01F 23/04).

The device comprises an impeller on a vertical rod kinematically connected to a rotation type drive, a top. A flywheel consisting of two rings is placed on the stock. One ring is connected to the rod, and the second is mounted on top of the flat surface of the first ring with a gap with respect to the rod. Bringing the impeller into rotation is accompanied by unwinding of the flywheel rings. When lowering the device into the tank to the mark of the liquid boundary, the impeller of the rod and the first ring connected to it are inhibited. The change in the relative position of the rings during braking of the impeller is determined by the signs located on the side surfaces of the rings.

The disadvantage of this device is the complexity of the design solution and, as a consequence, the high cost due to the presence of an additional drive with a kinematic connection. The device is applicable only for monitoring the interface between the media, where one of the media is air and the other is liquid. This device cannot be used to control the interface between two liquid media.

Closest to the proposed technical solution is a device for controlling the interface between media, which is used to determine the oil content in cooling and produced water (Russian patent No.2003053 C1, IPC G01F 23/40).

The device contains a measuring cable, equipped with a pointer, bifurcated at the end, and these bifurcated parts of the cable pass through the ballast load rollers and are attached from below to the float, which, given the specific gravity of its material, can float in water and sink in fuel. Thus, the float is located at the interface between two media (fuel and water) - with a different specific gravity. When the float is freely raised to the interface between two media, due to its specific gravity, the amount of fuel in the tank is controlled on a scale of a measuring ruler rigidly placed in the device, parallel to the measuring cable.

The disadvantage of this device is the design complexity. Measurement does not characterize the true amount of produced water in the tank, as includes the measurement of not only the water layer, but also the oil product layer (i.e. the measurement does not give accurate readings).

The technical result of the invention is to increase the accuracy of measuring the level and interface of liquids of different densities without the use of water-sensitive pastes, simplicity of design and maintenance of the device, intrinsic safety.

Figure 1 illustrates the operation of the roulette with a load when measuring the level of produced water, the measuring tape 6 with a load of 14 is placed in the product tank, previously water-sensitive paste is applied to the roulette load for good luck, it is kept under the product for 3 to 5 minutes or more. During this time, the paste is painted with water and the border of the layer of water and oil product appears on the tape or tape. The indicators read from the tape are the result.

Figure 2 illustrates the proposed device in General. The device comprises: a handle 1, a tape measure housing 2, an axis 3, a rewind assembly 4, a lever 5, a measuring tape 6, an indicator housing 7, light windows 8, a ground passage contact 9, a ground contact of the tape measure housing 10, a support roller 11, a contact loop 12 , the pin of the tape mounting unit 13, the load 14, the thrust bearing of the cargo of insulating material 15, the ground wire 19, the fixing screw 20.

Figure 3. Commercial water, together with mechanical impurities in reservoirs with oil and oil products, is an electrolyte that conducts electric current. To determine the presence of water, the roulette weight is lowered to the bottom of the tank 16 and the height of the stencil 17 is marked, on the dashed side of the tape 6, if there is water in the tank, between the ground contacts of the indicator housing 7 and the measuring tape 6, the circuit through the ground wire 19, to the tank body the electronic circuit of the indicator with the light diode of FIG. 4 closes and is triggered, light appears in the indication windows. In reverse, removing the cargo from the tank 16, by switching off the light diode, determine the oil-water interface 18, make a second mark on the dashed side of the measuring tape 6. The difference between the marks of the high-profile stencil 17 and the media interface 18 gives the height in centimeters layer of produced water in the tank 16. The amount of water in liters is determined from the calibration table of the tank.

Figure 4 is an electronic circuit of the device, consisting of a DC amplifier on two transistors with galvanic coupling. The device’s power source is an element with a voltage of up to 3.0 V and an EMF in the circuit: tape measure, through-contact indicator through the ground cable to the tank body up to 0.12 mA.

Specifications roulette indicative. - error of water indication ± 2 mm - presentation of indicators light / visual - tape length 10 m, 20 m, 30 m, 50 m - tape marking metric - tape division price 1 mm - tape error 2.5 mm / 30 m - ambient temperature -30 ... + 50 ° С - range of measured temperatures -40 ... + 90 ° С - device design intrinsically safe - source of power 3.0 v element - current 0.12 mA - ground wire type MKShV 2 × 0.35 - Light source Light-emitting diode - intrinsic safety margin 140 times - weight 2.5 to 3.0 kg - body material aluminum alloys - measuring tape material stainless and carbon steel

The ability to repeatedly play roulette indicative.

Multiple, accurate reproduction of the indicator for roulettes according to GOST 7502-98 is possible on existing equipment without restructuring production processes, when mounting the indicator on the axis of the drum of the tape winding unit.

The device is not bulky, symmetrical, based on the reserves of mechanical strength, designed for the full life of roulettes. The tightness of the indicator housing is ensured by standard seals.

The list of essential features of indicative roulette.

The proposed device roulette allows measuring metal in accordance with GOST 7502-98 and TU of manufacturers to turn into a display electronic device. The level of oil and water in the tanks is determined by one measurement step without the use of water-sensitive paste, which will reduce the time of measurement operations and improve the accuracy of measuring the interface between liquids of different densities, in particular water and liquid organic media. At high levels of the product in the paste tanks, when removing the load and tape, the roulette tape is partially washed off the tape, which leads to an incorrect result.

Currently, there is no device to control the drainage of water from reservoirs along the chain from production to consumption of oil and oil products. The proposed device also solves this problem, and if the indicator roulette is fixed on the tank and pumped commercial water in any way, the indicator will clearly show the end of the process of pumping water without product loss and environmental degradation.

Indication tape measure - mainly designed for stationary tanks with oil and oil products, differs from the prototype:

- the presence of a light electronic indicator, which is fixed on the axis of the winding mechanism of the tape roulette;

- the presence of a contact on an electronic circuit that is connected to a measuring tape;

- the presence of a second insulated feed-through contact on the indicator housing connected to the electronic circuit and through the ground cable of the tape measure to the tank body;

- the ability to simultaneously and quickly, in comfortable conditions, to carry out at any time of day and in any weather all operations for measuring oil products and produced water in tanks without the use of water-sensitive pastes;

- control the pumping or drainage of produced water from reservoirs with oil and oil products.

Claims (1)

Measuring metal measuring tape for measuring the level and / or interface between water and liquid organic media, containing a steel tape, characterized in that the tape is attached to the drum by a fixing screw, and an indicator consisting of a power source, a light, is attached to the axis of the measuring tape winding mechanism a diode and a controlled electronic circuit, one output contact of the circuit is connected through an axis and a fixing screw with a tape measure, another is an isolated, feed-through contact on the indicator housing through grounding wire connected to the tank body, reliable contact load on the node with tape fastening secures the conductor in a loop.

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