Froth fire extinguishing system has safe and reliable, economical and practical, fire-fighting efficiency high, especially has more outstanding superiority to the category-B fire of putting out a fire to save life and property, and is the basic mode of putting out a fire to save life and property of current home and abroad oil fire.Foam proportioner is froth fire extinguishing system " nerve center ", and the quality of its service behaviour is directly connected to the success or failure that froth fire extinguishing system fights a fire.Foam proportioner in the market mainly contains the types such as pressure air-foam proportioner, circular pump type foam proportioner, in-line foam concentrate inducer, the most of structure of these foam proportioners is all comparatively complicated, the pressure loss of proportioner is too large, is difficult to reach the standard-required that the pressure loss is less than 35%.
Chinese utility model patent ZL201220158957.5 discloses a kind of inline inductor, comprise blender body, in its cavity, anemostat is installed, anemostat internal sleeve is equipped with nozzle, the entrance of nozzle is provided with dividing plate, by said structure, the pressure loss of proportioner is controlled in critical field.But the hybrid chamber limited space of this proportioner; be difficult to guarantee the mixed effect of mixed liquor; impact fire extinguishing effect; in addition; although rely on dividing plate can reach the effect that reduces the pressure loss; but can reduce the mixed effect of foam, and the shown gauge pressure of setting pressure table is not the actual pressure of pipeline after dividing plate.
Utility model content
The purpose of this utility model is to provide the foam proportioner that a kind of mixing is more even, the pressure loss is less.
To achieve these goals, the utility model adopts following technical scheme:
A kind of foam proportioner, comprise main pipeline, be arranged on the first tube tooth interface of described main pipeline porch and be arranged on second tube tooth interface in described main pipeline exit, on described main pipeline, be also communicated with arm, the entrance of described arm is positioned at the position of described main pipeline near described the first tube tooth interface, outlet is positioned at the position of described main pipeline near described the second tube tooth interface, venturi anemostat is installed in described arm, the porch of described venturi anemostat is provided with Venturi nozzle, between described Venturi nozzle and described venturi anemostat, be formed with and mix cavity, described mixing cavity is communicated with foam solution or space outerpace by pipette, on described main pipeline corresponding near the exit of described arm, nozzle being also installed between the entrance of described arm and outlet.
As a kind of improvement of the present utility model, the inner flow passage of described nozzle is funnel-form near arrival end, is dentation near the cross section of the port of export.
As further improvement of the utility model, between the entrance of described arm and described Venturi nozzle, control valve is also installed.
Further improve as of the present utility model, porch and the exit of described main pipeline are separately installed with Pressure gauge.
Adopt after technique scheme, the Venturi nozzle arranging on arm and venturi anemostat produce Venturi effect for the first time, draw foam solution by pipette, mix for the first time; The nozzle of installing between the entrance of arm and outlet on main pipeline, can form Venturi effect again, draws on arm mixed mixed liquor for the first time, mixes for the second time.Mix by secondary, make the mixing of foam proportioner more even.Meanwhile, the pipeline of whole foam proportioner forms a loop, draws foam solution by arm, confluxes with the current after supervisor's pressurize, makes the pressure loss less.
In addition, the inner flow passage of nozzle is related to funnel near arrival end, Cross section Design near the port of export becomes dentation, can effectively impel current in nozzle exit end horizontal proliferation, more even with mixing of mixed mixed liquor for the first time, and there is the whirlpool of disappearing effect, make current direct projection, prevent that vortex phenomenon from causing nonuniformity coefficient to increase, and prevents fluidised form bad, the phenomenon that the pressure loss increases.By control valve is installed, can better regulate the mixing ratio of mixed liquor, by setting pressure table, can observe more intuitively the pressure condition of foam proportioner.
figure of description
Fig. 1 is the structural representation of the utility model foam proportioner, biopsy cavity marker devices in figure;
Fig. 2 is the front view of the nozzle of the utility model foam proportioner;
Fig. 3 is the cutaway view of the nozzle of the utility model foam proportioner.
In figure, indicate corresponding as follows:
The porch of A-main pipeline; The exit of B-main pipeline;
The porch of C-pipette; 1-main pipeline;
2-the first tube tooth interface; 3-the second tube tooth interface;
4-arm; 5-venturi anemostat;
6-Venturi nozzle; 7-blending space;
8-pipette; 9-control valve;
10-nozzle; 101-nozzle leading portion;
102-nozzle back segment.。
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
As shown in Figure 1, the foam proportioner of the present embodiment comprises main pipeline 1, be arranged on main pipeline 1 porch A the first tube tooth interface 2 and be arranged on the second tube tooth interface 3 of the exit B of main pipeline 1, the first tube tooth interface 2 can with press water pipeline or equipment connection, the second tube tooth interface 3 can with mixed liquor blow line or equipment connection, on main pipeline 1, be also communicated with arm 4, the entrance of arm 4 is positioned at the position of main pipeline 1 near the first tube tooth interface 2, outlet is positioned at the position of main pipeline 1 near the second tube tooth interface 3, venturi anemostat 5 is installed in arm 4, the porch of venturi anemostat 5 is provided with Venturi nozzle 6, between Venturi nozzle 6 and venturi anemostat 5, be formed with and mix cavity 7, mixing cavity 7 is communicated with foam solution or space outerpace by pipette 8, when use, can directly pipette 8 directly be inserted in foam solution, also can connect foam supply line or equipment at the porch of pipette 8 C.Between the entrance of arm 4 and Venturi nozzle 6, control valve 9 is also installed, control valve 9 can be controlled the discharge of arm 4.On main pipeline 1, corresponding to close arm 4 exits between arm 4 entrances and outlet, nozzle 10 is also installed, the outlet of nozzle 10 is just positioned at the exit of arm 4, the structure of nozzle 10 as shown in Figures 2 and 3, its inner flow passage is divided into the nozzle back segment 102 near the nozzle leading portion 101 of arrival end and the close port of export, nozzle leading portion 101 is funnel-form, and the cross section of nozzle back segment 102 is dentation.Porch A and the exit B of main pipeline 1 are separately installed with Pressure gauge (not shown).
The foam proportioner course of work of the present embodiment is as follows: opening pressure water is supplied to foam proportioner, press water flows into main pipeline 1 by the porch A of main pipeline 1 through the first tube tooth interface 2, there is shunting in the entry position at arm 4, partial pressure current direction arm 4, the press water of remainder is still interior mobile at main pipeline 1.The press water that flows to arm 4 flows to Venturi nozzle 6 through control valve 9 and is injected into venturi anemostat 5, the Venturi effect producing due to Venturi nozzle 6 and venturi anemostat 5, mixing the interior formation negative pressuren zone of cavity 7 or region of no pressure, thereby generation suction, sucks mixing cavity 7 by foam solution from pipette 8 and mixes for the first time.Pressure flow in main pipeline 1 is in the time of nozzle 10, also can produce Venturi effect one time, exit at nozzle 10 forms negative pressuren zone or region of no pressure, thereby generation suction, the exit of nozzle 10 will be drawn to through the mixed liquor mixing for the first time in arm, the press water ejecting with nozzle 10 mixes for the second time, then discharges from the exit B of main pipeline 1 through the second tube tooth interface 3.
By reference to the accompanying drawings the utility model is done to detailed explanation above; but embodiment of the present utility model is not limited in above-mentioned embodiment; those skilled in the art can make various distortion to the utility model according to prior art; as Article 2 arm etc. is set on main pipeline 1, these all belong to protection domain of the present utility model.