CN1428181A - Duplex isotactic centrifugal foam fire pump - Google Patents

Abstract

The present invention relates to a duplex isobaric centrifugal foam fire pump integrating fire pump, foam pump and pressure air foam proportion mixer into one body, and is characterized by that the fire pump, foam pump, pressure air foam proportion mixer, power transfer box, coupling and power-machine are mounted on a common base seat, the fire pump and foam pump can have different rotating speed, but they only can be driven by one power source. In order to implement said invented goal after the driving ratio and mixing ratio are defined, the ratio value of the specific resolution number of fire pump and specific revolution number of foam pump is a fixed constant.

Description

Duplex isotactic centrifugal foam fire pump

The present invention is a kind of new-type foam fire pump, output fire pump after it can mix foam solution in proportion with water automatically, pressurize.

Foam fire pump is the important component part of froth fire extinguishing system; It is the requisite function of this system that foam solution and water are mixed in proportion, for realizing this function, is having the proportional mixer for air foam or the device of different model now; What they had combines closely with fire pump, and what have then is discrete device.Negative pressure circular pump type proportional mixer for air foam is one of them, though it is effectively simple, since many to the bad adaptability and the operating procedure of different operating modes, and be unsuitable for automation control system supporting.Sump pressure formula air proportion mixer is because of working pressure container, anti-corrosive rubber film, and every cubic metre cost is above 10,000 yuan.Balanced valve formula proportional mixer for air foam and pump slide type equalizing pressure pump proporting system (U.S. Ansul company product) all need increase an independently foam pump again, cause system complex, cost height, operation inconvenience.

The purpose of this invention is to provide a kind of duplex isotactic centrifugal foam fire pump that integrates fire pump, foam pump, pressure type proportional mixer for air foam.

The object of the present invention is achieved like this, fire pump, foam pump, pressure type proportional mixer for air foam, power transmission box, shaft coupling and dynamic power machine are installed on the same public base, fire pump, foam pump can have different rotating speeds, but can only be dragged by a power source; Do like this be for:

1. between fire pump, foam pump, set up mathematical relationship.

2. the ratio of the flow of the flow of water and foam solution is being met under the situation of fire codes, keep disappearing

The outlet pressure of anti-pump and foam pump equate or its difference in the scope of permission, thereby directly make

Use the pressure type proportional mixer for air foam.

The present invention is exactly under the condition that guarantees correct mixing ratio compared with prior art, leaves out the parts of basin formula pressure vessel, anti-corrosive rubber film, balanced valve, pump slide plate and so on; Reduce production costs 30～50%.

The concrete structure of invention is provided by following embodiment and accompanying drawing.Fig. 1 is a floor plan of the present invention, 1 is dynamic power machine among the figure, it can be that diesel engine also can be a motor, on the output shaft 2 of dynamic power machine, yielding coupling 3 is housed, power input shaft 4 connects with fire pump 5, the power output shaft 6 and the transmission case 7 of fire pump link, transmission case links by power input shaft 8 and foam pump 9, the 10th, it links to each other the import of fire pump with fire cistern, the 11st, it links to each other the fire-fighting delivery side of pump with an import 12 of pressure type proportional mixer for air foam 13, foam delivery side of pump 16 links with another import 14 of pressure type proportional mixer for air foam 13, the 15th, the outlet of foam mixing liquid, the 17th, the import of foam pump, it links to each other with the container that holds foam solution, and the 18th, public base.So just constituted a duplex isotactic centrifugal foam fire pump unit.In order to guarantee that fire pump and foam pump outlet pressure equate, the foam mixing liquid mixing ratio is correct, between fire pump and foam pump, following mathematical relationship should be arranged:

If make the rotating speed of fire pump is n ₁

The rotating speed of foam pump is n ₂

The specific revolution of fire pump is n _S1

The specific revolution of foam pump is n _S2

Make gearratio $i=\frac{n_1}{n_2}$

Mixing ratio x%

So, the specific revolution of fire pump and foam pump

Following relation is arranged between the specific revolution $n_{s1}=\frac{{\left(\frac{100-x}{x}\right)}^{\frac{1}{2}}}{i}{\mathrm{qn}}_{s2}$

Q is the system features coefficient in the formula, because of centrifugal pump

Shape, filler, working medium are different and not, its

Value is between 0.8～1.0, by the experiment decision.

If order $C=\frac{{\left(\frac{100-x}{x}\right)}^{\frac{1}{2}}}{i}q$

That just can obtain final result: n _S1=cn _S2

C in the formula is the zero dimension constant,

This formula is not the discovery of science, and it just is illustrated as realizes purpose of the present invention, and after gearratio, mixing ratio were determined, the ratio of the specific revolution of fire pump and the specific revolution of foam pump should be a set constant C.

Claims (2)

1. fire pump, foam pump, pressure type proportional mixer for air foam, power transmission box, shaft coupling and dynamic power machine are installed on the same public base, fire pump, foam pump can have different rotating speeds, but can only be dragged by a power source.

2. device according to claim 1 is characterized in that the ratio of the specific revolution of fire pump and the specific revolution of foam pump is a set constant after gearratio, mixing ratio are determined.