RU44178U1 - LOW COSTS LIQUID DISPENSER - Google Patents

Abstract

Low-cost liquid dispenser refers to the means of automatic control of production processes associated with the dosed liquid in the process.

A fluid dispenser comprising a housing, a fluid, a control valve, pipelines, a control device, the housing is filled with fluid to a variable, certain level, controlled by a level sensor. A capillary is located in the lower part of the dispenser, through which the liquid flows, the control valve is electrically connected to the control device, to which signals of the given and actual liquid levels in the housing are supplied.

Description

The low-cost liquid dispenser belongs to the means of automatic control of production processes and is intended for dispensing pure continuous reagents into the flotation process.

Known metering device (l.1) - application No. 0189640 EPO, containing a cylinder with a diluting liquid, a cylinder with a sample, a button, a blocking valve. When the button is pressed, the blocking valve is closed, and the pistons move, creating a vacuum and allow the dilution fluid and a certain amount of sample to flow into the metering channels. When the button is not pressed, the valve is open and the pistons push out the accumulated through the tip.

An automatic device for dispensing liquid reagents into a technological process is known.

Several products (up to 3-4) are constantly fed through pipelines to the flow tank. Products 1-4 are collected in certain quantities in a special vessel mounted on accurate scales. Liquefaction is carried out in this vessel. The diluted product is sucked into the analyzer by a peristaltic pump. Management of all necessary

operations are carried out using a microprocessor. (L2) - French patent 3 No. 2579749 C _t 01 No. 1/00, publ. 10/ 86/03. No. 40)

There are also known dispensers: automatic feeder for small expenses PMR-7, PMR-7A, automatic feeder for medium expenses, PRIU-4, automatic feeder for large expenses, PBR-2, dispenser DZZh-5, DZZh-6. (L3, L4, L5)

The PMR-7A low-cost feeder (dispenser) contains: a housing, a measuring vessel in which the float is located, with a fixed rod and two solenoid valves inlet and outlet, a valve switching device, pipelines. The dispenser works from the control device. The control device alternately turns on and off the electromagnets of the two valves of the feeder, ensuring the filling of the vessel with reagent (liquid) and its discharge into the flotation process. Provides a flow rate of 0.5-10 l / h, with an accuracy of 2.5%. The feeder is controlled by a control device for impulses of a fixed length with a variable frequency of 3-10 imp / min, a batcher of periodic action, (l.4. P. 2.23)

The main disadvantage is the small accuracy and stability of dosing, dosing is carried out periodically, the difficulty of dosing very small reagent costs.

The task that needs to be solved by the new design of the dispenser is to provide continuous, accurate and stable dosing of purified clean reagent liquid into the flotation process.

To solve this problem, a new design of the liquid dispenser has been developed: a capillary is fixed in the lower part of the dispenser, through which continuous outflow (flow) occurs

liquids. The housing is filled with fluid to a controlled variable level, which is monitored by a level sensor that provides a signal to the control device controlling the flow of fluid into the housing.

The flow rate of the liquid from the capillary depends on the difference in liquid levels in the dispenser housing and the plane of the inlet section of the capillary, on the ratio of the cross-sectional areas of the internal space of the housing and the internal section of the capillary. (l.6)

The essence of the new design of the low-cost dispenser is presented in Fig. 1, where:

1 - fluid dispenser housing

2 - liquid

3 - capillary

4 - level sensor

5 - dispenser control device

6 - control valve

7 - fluid supply line

8 - pipelines

9 - liquid dispenser output

10 - task for fluid flow

11 - shutoff valve

12 - air supply valve.

The operation of the liquid metering device of low costs is as follows:

liquid 2 enters the internal cavity of the dispenser housing 1 through an inlet pipe 7, a control valve b, pipe 8. The liquid level in the internal cavity of the dispenser is controlled by a level 4 sensor, which transmits an electrical signal to the control device, which

sets a certain level of fluid in the dispenser housing. The control unit 5 receives a task (flow rate) 10, which corresponds to a certain level, a capillary 3 is fixed in the lower part of the dispenser, which communicates via a pipe 8 with the interior of the vessel 1 and from the outlet 9 of the capillary 3 there is a stable continuous flow of liquid into the process.

To prevent clogging of the capillary in the fluid supply line 8 to the capillary, a shut-off valve 11 is installed, which, upon a signal from the control device, cuts off the liquid supply to the capillary, and at this time the control device opens the air supply under pressure to the capillary through the valve 12, which blows occasionally the capillary, ensuring the stability of the internal section of the capillary.

As a liquid level sensor, a buoy level sensor and, as a specific sensor, a D-904 sensor or a Level-T sensor manufactured by SoyuzTSMA OJSC (l.4) can be used.

The proposed device is new, has an inventive step, provides a stable continuous flow of fluid in small volumes.

LITERATURE

1. Application EPO No. 0189640, С _t 0№1 / 20, published 86.08.06 No. 32 (priority of Finland 3№844320 from 02.11.84.

"Dosing device"

2. Application of France No. 2579749, G 01№1 / 00, B 01 F 3/08,

publ. 86.10.03.№70, filed March 28, 1985 No. 8504642. "Automatic device."

3. Catalog of ONTK “SCMA” 1991, Moscow, pp. 40, 41, 65, 311, “Devices, systems and automation means”.

4. Catalog of SCMA OJSC 2001, Moscow, pp. 2.23, 2.7, 2.2 Low Cost Feeder PMR-7A, Level-T Level Sensor, Buoy Series 904 Level Sensor.

5. A.S. USSR No. 1224460 BI No. 14-1986 Pneumatic displacement pump F 04 F 1/00

6. Chuguev P.P. "Hydraulics", L.O. "Energy", 1975, p. 333

Claims (5)

1. A low-flow liquid dispenser comprising a case filled with liquid, a control device, a control valve, pipelines, characterized in that the case is filled with a variable level liquid, the liquid level in the case is controlled by a liquid level sensor, and a capillary is located in the lower part of the dispenser through which fluid outflow into the process, the level sensor sends a signal proportional to the actual liquid level to the valve control device, which also receives a reference signal level, and the control device through the valve controls the flow of fluid into the housing. 2. The device according to claim 1, characterized in that the displacer sensor is used as a level sensor. 3. The device according to claim 1, characterized in that the sensor "D-904" is used as a buoyant sensor. 4. The device according to claim 1, characterized in that the level-T sensor is used as a level sensor. 5. The device according to claim 1, characterized in that a shut-off valve and an air valve are added to purge the capillary with air from the compressed air line or compressor, which are controlled from the control device.