SU39075A1 - Filtration rate regulator - Google Patents

Description

The filtration rate regulators serve to maintain the constancy of the rate of passage of water through the filter loading, which is absolutely necessary for American type filters that are most common in modern sewage treatment plants.

The best design of the filtration rate regulator are membrane regulators manufactured by Siemens (Germany) and Simplex (DSS).

These regulators are a combination of a Venturi tube with a double-seated valve, fitted with a rubber elastic membrane encased in a box, divided by it into two chambers. The upper chamber communicates directly with the water flowing to the valve box. The bottom chamber is connected by a copper tube with a narrowed section of the venturi, where the moving water creates a reduced pressure. The pressure difference in the valve box and in the throat of the venturi is directly proportional to the square of the water velocity in the pipe.

A reduced pressure is transmitted through the connecting tube to the lower chamber under the membrane. Increasing the water velocity in the pipe increases the pressure difference in the chambers above the membrane and under the membrane and pulls it down, so the valves are connected 51)

rigidly with membrane, cover up, which reduces the speed of water in the pipe and back.

To set the regulator at different speeds, use a lever with a movable load, supported by a prism on a suitable support. The lever is connected by a flexible link (tape or cable) to the valve stem, equipped with a hinge, and tends to pull it up and open the valves; this is counteracted by the force arising on the membrane due to the presence of the above-mentioned pressure difference.

The design described has a number of disadvantages, namely:

1) the water passing through the pipe carries with it fine sand, and sometimes gravel, settling on the membrane from above, wedging along the edges and distorting its work;

2) the same sand clogs the connecting tube, which stops the operation of the regulator;

3) the lever design with a movable load, balancing the force on the membrane, is inconvenient to operate on large sewage treatment plants, where there are many filters and regulators, since if you want to change the performance of the filtration plant, you have to move heavy loads (about 40 g) all regulators.

which requires considerable time and energy;

4) the lever system with the load is not free from friction (confirmed by testing), which gives a deviation of the filtration rate from the normal by -7%;

5) the described construction of the regulator is inconvenient in terms of repair, since in order to remove the membrane, it is necessary to remove the bottom cover, which is normally the support of the regulator on the foundation; the entire regulator must be removed to remove the cover;

6) the system of fastening the rod to the regulating lever with a load sometimes gives a break in the thin part of the rod.

The basic principle of operation of the proposed controller is the same as the principle of the controller described above. Constructive changes, however, are intended to free the new regulator from the above disadvantages.

The drawing shows the entire sectional slider design.

The water coming from the filter through the pipeline passes the throat of the Venturi tube 7, where it creates a reduced pressure transmitted by the connecting tube 2 equipped with a filter 9 for trapping sand into chamber 3 above the membrane 19 located in the upper part of the regulator (as opposed to Siemens regulators and Simplex, where the membrane is installed below).

As the water velocity in the pipe increases (or decreases), the pressure difference above and below the membrane increases (or decreases), causing cover (or opening) of valves 4 and, consequently, a decrease (or increase) in speed to the original.

The force arising on the membrane is balanced by the backpressure of the hydraulic actuator located in the housing 5 above the valve box / and filled with water. The change in filtration rate is achieved by varying the pressure above the actuator piston d. The drive piston is a cast-iron disc entering the cylinder with a large gap, which is covered by a rubber membrane 8, clamped in the piston and in the cylinder.

The membrane when the piston moves

it is separated downwards without any friction and is applied to the cylinder and back as the piston moves upwards.

The change in pressure above the actuator piston is achieved by varying the water level in the special hydraulic column 10.

The water level in the column is kept constant as follows: a constant flow of water (about 10-20 liters per hour) is supplied to the column through pipe 11, which is then drained through a rubber hose 12 into the sewer system.

The hose 12 is from the mobile vessel 14, communicated with the column by the hose 13.

Hoses 12 and 13 have a section that is sufficient to pass the above-mentioned water flow without noticeable backwater. Thus, the water level in column 10 will correspond to the level of the top of the septum 75 of the vessel 14. Moving the vessel 14 through the crank 16 produces a change in the water level in the column, and hence the pressure above the piston 6 and the filtration rate.

The vessel 14 is provided with a pointer moving along the rail 77, on which the filtration rates corresponding to the water levels are plotted.

The subject matter of the invention.

1. A filtration rate regulator equipped with a double-seat valve connected to a rubber membrane and fixed in the Venturi tube, characterized in that a piston 6 on the piston rod 6 of the double-seat valve 4 connected by a rubber membrane 8 to the housing 5 is equipped with a hydraulic head a water supply pipe 77 and a tank 14 movable on a rubber hose 13 to regulate the height of the water column in the tank 10.

2. When adjusting the filing speed controller according to item 1, use chamber 3 with a rubber membrane 19 and connecting tube 2 at the top of the double seat valve 4 with a chain of protection from sand getting into them.

3.When regulating the filtration rate in accordance with paragraphs. 1 and 2 are applied on the connecting tube 2 of the filter 9 for trapping sand.