Selection of water pump vacuum water tank

Selection of Pumps and Vacuum Suspension Tanks for Building Materials and Applied Housing Equipment Hou Wei1, Liu Hongsong2 (1.Shenyang Construction Engineering Company of Liaoning Province, Shenyang, Liaoning 110148, China 2 Fushun City Special Steel Company Planning and Design Institute, Fushun, Liaoning 123000, China) According to the principle of vacuum water tank And in the application of the project, summed up the basic ideas and methods for their selection, for their counterparts.

Vacuum water tank; pressure; volume In the engineering design, the application of vacuum water tank solves the self-irrigation problem of the water pump, which has the advantages of simple and convenient, practical application is wider, and many manufacturers have formed a stereotyped product. However, in the selection of water diversion tanks, most of them use estimation methods and the errors are relatively large. The author in the actual work, according to the principle of the vacuum suction tank, calculate the maximum amount of vacuum pumping water, and use this as a basis for the selection of drinking water pumps, the use of more convenient.

Shown is a schematic diagram of a typical vacuum siphon tank. When the water pump absorbs water from the tank, the air volume Wi increases and the pressure decreases. Under the effect of atmospheric pressure, the water in the water tank enters the tank body. The flow rate in the diversion pipe rises from zero. When it is less than the pump flow rate, the water surface continues to fall and the flow rate of the diversion pipe increases. When the flow of the diversion pipe is equal to the water absorption of the pump, the water surface remains constant and reaches a dynamic balance. At this time, the system operates normally. Assume that when a certain type of pump is used, the level in the tank falls to the level in the design tank and reaches equilibrium. At this time, the maximum amount of water drawn by the vacuum tank is obtained.

From the analysis of the physico-chemical gas evolution process, the gas in the tank is an adiabatic expansion process at the beginning of the operation (usually considered to be isothermal expansion, which is a mistake of the concept). For the convenience of calculation, this paper still uses the isothermal expansion calculation formula (this is partial safety The law of glassy horses is as follows.

Including: W1 vacuum siphon just filled with water P0 = P2 when the volume of air in the tank (m3) W2 when the vacuum priming tank just filled with water, the volume between the highest water level and the design minimum level in the tank (m3), within the tank The design minimum water level is generally 20cm higher than the upper edge of the suction pipe of the pump. The Bernoulli equation is established at the water surface of the pool and at the outlet of the water diversion pipe: 0 atmosphere (m); the water level of the V0 pool is decreasing, very small, approximately zero; V1 water absorption Tube suction rate (m/s) 2Ah Total suction pipe line loss, including head loss and partial head loss should be calculated separately (m).

Seen (m) block brick price is higher than 100,000 yuan) Honeycomb block press, large tonnage, high body cost, to give full play to the benefits also depends on increasing production, indirectly reduce the cost. The author produced 1800 blocks when it was verified on a mechanical model that the production would be achieved after accumulating more operating experience.

By then, the price of mechanical models can be lower than that of vibratory block machines. Hydraulic models can increase production by producing large blocks and adopting a dual-mode structure.

Honeycomb block press can produce blocks with 60% hole rate. It has good exhaust performance when forming. It is especially suitable for producing fly ash honeycomb blocks. Fly ash density is smaller than sand, insulation is better than sand, and it can be expanded to thermal insulation blocks. . Honeycomb block hole shape is reasonable, can bear weight, should expand to the field of sintered bearing blocks. In short, the application field needs to be opened up, and its use value can be improved.

4 Application of "high-pressure hard plastic molding" software The above briefly introduced the mold and the host, but this is only the hardware, if not supporting the "high-pressure hard plastic molding" software, there are still serious mechanism defects. Because the traditional semi-dry forming theory believes that the blank thickness should be less than the width, but the honeycomb block is the opposite, its thickness is 140mm, the width is only 5mm, severely inverted, the pressure reduction is expected thing. The actual operation has been verified that when the billet moisture content is 6%, various technical solutions cannot avoid the uneven density of the honeycomb block. Therefore, the author adopted the hard plastic molding process of the brick extruder for the honeycomb block press. We know that the parameters of the hard plastic molding of the brick extruder are: pressure 6MPa forming moisture 14%~18%. The net area pressure of the honeycomb block press reaches 80MPa, and when adjusting the moisture of the blank to be 10%~12%, it is inevitable that the hard plastic effect is achieved. . It has been proved that when the net area pressure is 54 MPa (press pressure is 200 tons), the density of the green body has become uniform, achieving the goal of "hard plasticizing". In this way, the entire mechanism of the honeycomb block press is intact.

For the billet with 10%~20% moisture content, the problem of preparation is that the screen hole is easy to be blocked, but there are many screening devices that are easy to clean manually, and do not restrict the implementation of the “hard plastic” process. At the same time, a self-cleaning feeder with less investment and automation can solve this problem.

One minute on the stage and ten years of work at the stage, I hope this article can give a useful inspiration to my colleagues.

Continuing on page 21 (1) Substitute (3) where: Q* water diversion tank maximum diversion volume (m3/h); g gravitational acceleration (m/s2); A* specific resistance of water diversion pipe; * diversion pipe Full-length (m); 2Z* partial resistance coefficient of the water diversion pipe.

The selection of the vacuum water tank is generally divided into the following steps: 1. According to the project situation, the vacuum tank model is selected, and the maximum water diversion volume of the vacuum tank is obtained using equation (4). K=Q, K is the safety factor, K= 1.3~1.8 is suitable.

2 The use of public, male, engineers, mainly engaged in water supply and drainage engineering design and construction.

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