RU218325U1 - Diaphragm liquid dispenser for vacuum deaerator - Google Patents

Abstract

The utility model relates to the field of dosing devices and can be used for dosing reagents into a vacuum deaerator. A membrane liquid dispenser for a vacuum deaerator comprises a body 1 divided by a membrane 3 into a dosing chamber 4 and a drive chamber 5, and a return spring 6 installed with the possibility of loading on the membrane 3 towards the drive chamber 5. According to the utility model, an axial shaft is additionally formed in the body of the casing 1 channel 7, for communication through the inlet 9 and outlet 10 branch pipes with the inlet 11 and outlet 12 valve, as well as holes 8 connecting the dosing chamber 4 with the axial channel 7. The return spring 6 is mounted in the drive chamber 5 between the membrane 3 and the cover 2 of the chamber 1 , in which a hole 13 is made to connect the drive chamber 5 with the air atmosphere. In cover 2, a limiter 14 of the stroke of the membrane 3 is mounted to control the volume of the dosing chamber 4.

The technical result of the utility model is to simplify the design. 2 w.p. f-ly, 1 ill.

Description

The utility model relates to the field of dosing devices and can be used for dosing reagents into a vacuum deaerator.

Membrane dispensers are a specialized device, the purpose of which is to dispense a variety of liquid or viscous media. Such units are widely used not only in various areas of industry, but also in everyday life. The most demanded areas where dosing devices are used are water treatment plants and water treatment systems.

Known diaphragm metering pump fluid with electromagnetic drive (RU 155633, class F04B 17/04, F04B 43/04, 2015), including a solenoid coil, as well as a movable armature and a fixed stator, mounted coaxially and interconnected by return springs , providing movement of the anchor to the travel limiter. The rod is installed in the stator cavity and coaxially to it, on one side, it is rigidly connected to the armature, and on the other side, to a rigid center, on which a membrane is fixed, connected to the casing of the flow path of the pump, containing a working chamber with inlet and outlet valves connected to each other by a channel. The dosing pump is equipped with a flexible suspension, fixed at one end on the axis of the movable armature, and at the other end - on a support rigidly mounted on a fixed stator. An air gap is formed between the rod and the walls of the stator cavity.

A disadvantage of the known diaphragm dosing pump is the presence of a massive solenoid and passive valves that do not allow dosing liquid directly into vessels and pipelines with a pressure below atmospheric. To do this, it is necessary to install an additional spring-loaded check valve in the line after the exhaust valve, which greatly complicates the design.

As a prototype, the most similar in design and principle of operation volumetric metering pump (SU 635275, class F04B 13/00, F04B 43/00, G01F 13/00, 1978) containing a housing with a metering and drive chamber. In the dosing chamber, pneumatic distribution valves are installed, controlled by the compressed air pulse control system, and the second one is connected to the pneumatic source. The chambers are separated by a membrane block, including a working membrane with cavities for an intermediate liquid and a double-membrane drive element with a rigid center, the membrane block is loaded with a return spring towards the drive chamber.

The design of a volumetric pump-dispenser is complex, requiring compressed air for dosing reagents, and, consequently, additional equipment, which greatly complicates the entire design of the deaeration plant.

The problem to be solved by the utility model is the development of a liquid dispenser design for a vacuum deaerator.

The technical result of the utility model is to simplify the design.

The problem posed and the claimed technical result are achieved due to the fact that the membrane liquid dispenser for the vacuum deaerator contains a body divided by the membrane into a dosing and drive chamber and a return spring installed with the possibility of loading the membrane towards the drive chamber. According to the utility model, an axial channel is additionally formed in the housing body for communication through the inlet and outlet pipes with the inlet and outlet valve, as well as holes connecting the dosing chamber with the axial channel. The inlet and outlet valves are made with the possibility of opening and closing by means of the control system. The return spring is mounted in the drive chamber between the membrane and the chamber cover, in which a hole is made to connect the drive chamber with the air atmosphere. The cover is equipped with a diaphragm stroke limiter to control the volume of the dosing chamber.

The diaphragm travel stop is preferably mounted on the vertical axis of symmetry of the housing.

It is advisable to fix the membrane between the cover and the housing body.

The presence of an axial channel in the body of the housing provides communication through the inlet and outlet pipes with the inlet and outlet valve, simplifying the design of the diaphragm dispenser. The removal of the valves outside the body of the device makes it possible to simplify the overall design of the dispenser, as well as the dosing process, due to the possibility of electrical control of the inlet and outlet valve, instead of the pneumatic control used in the prototype.

The pressure drop across the membrane, when displacing the dosed liquid from the dosing chamber, is provided by the pressure of the surrounding atmosphere in the transfer chamber, the connection with which is carried out due to the presence of an opening in the housing cover and the rarefied pressure of the vacuum deaerator with the inlet valve closed and the outlet valve open. The membrane returns to its original state when the dosing chamber is filled with a dosing liquid due to the presence of a return spring.

The utility model is illustrated in the drawing, on which the positions indicate:

1 - the body of the body;

2 - cover;

3 – membrane fixed between the cover 2 and the body of the body 1;

4 - dosing chamber;

5 - drive chamber;

6 - return spring installed with the possibility of loading on the membrane 3 towards the drive chamber 5;

7 - axial channel formed in the body of housing 1;

8 - holes connecting the dosing chamber 4 with the axial channel 7;

9 - inlet pipe;

10 - outlet pipe;

11 - inlet valve;

12 - exhaust valve;

13 – hole in cover 2;

14 – membrane stroke limiter 3, mounted in cover 2 on the vertical axis of symmetry of body 1.

Membrane liquid dispenser for vacuum deaerator works as follows.

In the initial state, the inlet 11 and outlet 12 valves are closed, the volume of the dosing chamber 4 is maximum, and it is filled with the dosed liquid reagent. To dispense one dose of liquid reagent, the control system (not shown in the figure) opens the outlet valve 12, it connects the dosing chamber 4 through the outlet pipe 10 with a vacuum deaerator (not shown in the figure), in which the pressure is below atmospheric. Due to the pressure drop across the membrane 3 between the pressure of the ambient atmosphere and the rarefied pressure in the vacuum deaerator, which is transferred to the dosing chamber 4 through the open exhaust valve 12, the membrane 3 begins to move down, the liquid reagent is displaced from the dosing chamber 4 into the axial channel 7 through the holes 8 to communicate the dosing chamber 4 with the axial channel 7 and further through the outlet pipe 10 to the vacuum deaerator. When the minimum volume of the dosing chamber 4 is reached, the displacement of the liquid reagent stops and the control system closes the outlet valve 12. The cavity of the dosing chamber 4 remains under reduced pressure. The control system opens the inlet valve 11 and the liquid reagent through the inlet pipe 9 is sucked into the dosing chamber 4 until its volume increases to the maximum set by the limiter 14 of the membrane 3 stroke, due to the return spring 6. When the dosing chamber 4 is filled with the dosing liquid reagent, the control system closes inlet valve 11. The liquid dispenser for the vacuum deaerator is in its original state.

The use of the claimed membrane dispenser for a vacuum deaerator allows, with minimal dimensions and exceptional simplicity of design, to ensure reliable and accurate dosing of liquids into a vacuum deaerator, using the presence of vacuum to create a pressure drop across the membrane and, thereby, force on the membrane to displace the dosed liquid from the dosing chamber without using the energy of compressed air, electric motors and solenoids. The regulation of a single dose is carried out by a membrane stroke limiter, and the amount of the total supply of the dosed liquid is produced by changing the number of doses supplied, while the dose is strictly constant and does not depend on atmospheric pressure fluctuations or vacuum fluctuations in the vacuum deaerator within acceptable limits, which allows dosing with high accuracy.

Claims (3)

1. A membrane liquid dispenser for a vacuum deaerator, containing a housing divided by a membrane into a dosing and drive chamber, and a return spring mounted with the possibility of loading the membrane towards the drive chamber, characterized in that an axial channel is additionally formed in the body of the housing for communication through inlet and outlet pipes with an inlet and outlet valve, as well as holes connecting the dosing chamber with the axial channel, while the inlet and outlet valves are made with the possibility of opening and closing by means of the control system, the return spring is mounted in the drive chamber between the membrane and the chamber cover, in which has a hole for connecting the drive chamber with the air atmosphere, in addition, a membrane stroke limiter is mounted in the cover to control the volume of the dosing chamber. 2. Membrane dispenser according to claim 1, characterized in that the membrane stopper is mounted on the vertical axis of symmetry of the housing. 3. Membrane dispenser according to claim 1, characterized in that the membrane is fixed between the lid and the housing body.

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