SU1811602A3 - Liquid metering-out device - Google Patents

Description

The invention relates to the field of pump engineering, relates to diaphragm metering pumps and may find application in various sectors of the economy in dosing processes.

The aim of the invention is to expand the dosage range.

The drawing shows a diagram of the proposed device for dispensing liquids.

The device contains three blocks 1, 2, 3 with a measured capacity 4, input 5 and output 6 valves, and the measured capacity 4 is divided by a membrane 7 into a working 8 and a drive 9 (controlled) cavity, the working of which is connected with input 5 through the corresponding channels 10 and output 6 diaphragm valves, and the controlled (drive) hollows of 9 measured capacity 4 and valve membranes are connected through the corresponding lines 11, 12,13, 14, 15 to the distribution unit 16 with pneumatic inputs 17 (+ RPIT) and 18 (-Rpit) . Block 2 and 3 is equipped with an identical message of the working cavity 8 of the measuring tank 4 with inlet 5 and outlet 6 membrane valves. The distribution unit 16 is equipped with distributors with pneumatic inlets (not shown), the outputs of which are on the lines 11. 12, 13 are connected to the controlled cavity of the measuring capacity of 4 blocks 1, 2, 3. The controlled cavities of the inlet and outlet membrane valves of the block 1,2, 3 are connected to the corresponding channels 14, 15. Highways' 14, 15 are connected to the corresponding valves (valves are not shown in the drawing). The line 14 instead of the distributor can be connected to a pressure regulator / Distributors can be made, for example, in the form of ESEPP P1PR5 elements, the vacuum is connected to one input and the pressure is connected to the second. The outputs of the distributors are directly connected to channels 11, 12, 13,14,15. Distributors to channels 11,12. 13, 14, 15 can be connected via pneumatic relays, a USEPP element. In this case, only the supply pressure is supplied to the distributor, and pressure and vacuum to the pneumatic relay.

The measured containers of 4 blocks 1,2, 3 are made of various volumes, according to the law of geometric progression and correspond to the number series 1, 2, 4 ... or 1, 3, 9 ... If one liquid is dosed, then the device for dosing the liquid may have one inlet 5 and one outlet 6 valve, and measuring tanks 4 may be several.

connected in parallel or in series in one or more blocks.

A device for dispensing a liquid is included in the work by supplying power energy.

In the initial state, before starting work, the distribution unit automatically, according to the program or manually using toggle switches (not shown in the drawing), gives pressure to all the drive cavities. Under the influence of the pressure of compressed air, the membranes 7 bend down and close the passages for the dosed liquid. The volumes of the working cavities 8 are equal to zero.

The process of filling with fluid working cavities 8 is as follows.

The distribution unit 16 gives a signal in the form of a vacuum to the line 14 and all the drive cavities of the inlet valves 5. The membrane of the valves 5 under the force of the vacuum bend up and the measuring tanks 4 of all blocks 1,2,3 are ready for liquid intake. If it is necessary to fill and dose the volume of the measured capacity 4 of block 1, then the distribution unit 16 gives a signal in the form of a vacuum only to the line 11 of the block! Despite the fact that all inlet valves 5 are open, the filling of the working cavity 8 is carried out only in the block! After that, the inlet valves 5 are closed by applying pressure from the distribution node 16 to the line 14. The measured tank 4 of the block 1 is ready for the dose. To do this, it is sufficient to apply pressure to the drive cavity 9 of the measuring tank 4 if the output valves 6 are connected to a pressure regulator or to open the output valve 6 first if it is connected to the distributor. For this, the distribution unit 16 gives a signal in the form of a vacuum to the line 15. Despite the fact that all output valves 6 will be open, the dose will be issued only from the working cavity 8 of the measured capacity of the 4 unit!

Similarly, you can issue a dose from the measuring containers 4 of two or three blocks. To do this, it is enough to send signals in a bidet of pressure and vacuum to the · drive cavities of 9 measuring tanks 4 of two or three blocks at the same time (i.e. in the highway 11,12 or 11,12,13). If the measured capacities of 4 blocks 1,2,3 are 1 cm ³ , 2 cm ³ and 4 cm ³ , then you can get seven different doses equal to 1 cm ³ , 2 cm ³ , 3 cm ³ , 4 cm ³ , 5 cm, 6 cm ³ and 7 cm ³ .

The maximum number of doses m = 2 ^p -1 where m is the number of doses;

- a value characterizing how many times each subsequent measured capacity of the next block is greater than the measured capacity of the previous block;

η is the number of measured capacities.

m = 2 ³ - 1 = 7.5

If each subsequent measured tank 4 is three times larger than the previous measured tank 4, i.e. volumes equal to 1 cm ³ , 3 cm ³ and 9 cm ³ , then the maximum number of doses is determined by the well-known mathematical expression of 10 geometric progression:

where η is the number of measured tanks 4, if n = 3, then

S ³ - 1

3-1

Such a number of doses can be obtained in the presence of three measured containers 4, if their working cavities 8 are interconnected and have only one inlet 5 and one outlet 6 valves. In this case, the valves of blocks 2 and 3 are absent, and the working cavities of the measuring tanks 4 of the blocks 2 and 3 are connected to the channel 10. The working cavities of the measuring tanks 4 are filled and emptied in the same way, but there is a difference in the formation of a dose equal to even numerical values. If it is necessary to give a dose equal to 1, cm ^3, it is enough to first open the inlet valve 5, fill the working cavity of the measuring tank 4 of block 1, close the inlet valve 5, open the outlet and, giving a signal in the form of pressure to the line 11, displace the liquid from the measuring tank 4 blocks 1, If it is necessary to give a dose equal to 2 cm ³ , then it is necessary to fill the working cavity 8 of the measured capacity 4 of the block 2 in the same way, by opening the inlet valve 5, then apply vacuum to the line 12 and fill the working cavity 8 with the liquid of the measured capacity of 4 blocks 2 Then close the input valve 5 and apply vacuum to the drive cavity of the measuring tank 4 of the block 1. At the same time, the liquid from the measuring tank 4 of the block 2 will fill the working cavity 8 of the measuring tank of 4 blocks

1. Then open the outlet valve 6 and apply pressure to the line 12. At the same time, the liquid from the volume equal to 3 cm ³ filled the volume equal to 1 cm ³ and the remainder equal to 2 cm ³ will be dispensed. If it is necessary to dose a volume of 3 cm ³ , then fill the measured capacity of block 2 with liquid and displace it, etc. Thus, adding and subtracting in various combinations the volume of liquid, using three measured volumes, you can get 7 or 13 dose options.

Thus, due to the introduction of at least a second unit with identical communication between the working cavities of the membrane tank with the outlet and inlet membrane valves and an additional distributor with pneumatic inlets, as well as the execution of the working cavity of the measuring tanks with different volumes, it is possible to expand the dosage range.

Claims (1)

Claim A device for dispensing a liquid, comprising a first unit with a measured capacity, inlet and outlet membrane valves, the measured capacity being divided by a membrane into a working and drive cavity, the working of which is connected through the corresponding channels with the inlet and outlet membrane valves, and the controlled cavities of the measured capacity and membrane valves are connected through the corresponding lines to the distribution unit with pneumatic inlets, characterized in that, in order to expand the dosing range, it is introduced along the edge at least a second unit with an identical message from the working cavity of the measured capacity with the inlet and outlet membrane valves and an additional distributor with pneumatic inputs that is connected to the controlled cavity of the measured capacity of the second block, and the controlled cavities of the input and output membrane valves of the second block are connected respectively to the inlet and the output valves of the first block, and the working cavity of the measuring tanks are made with different volumes. Compiled by A. Biryukov Editor A. Kupryakova Tehred M. Morgenthal Corrector L. Fil * Order 1466 Circulation Subscription VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Combine Patent, Uzhgorod, 101 Gagarin St.