CN1102929A - Sprinklers with pressure sensitive valves - Google Patents

Abstract

A spray head for fire apparatus comprising a valve stem member which is resiliently urged into an inlet of the spray head whereby the valve stem member will hold the inlet closed against the standby pressure of the fire apparatus but will yield to the pressure of a source of high pressure liquid to deliver liquid to a nozzle of the spray head through a complete release conduit.

Description

The present invention relates to a nozzle for fire-fighting equipment, especially for fire-fighting equipment that can be controlled to operate with high-pressure driving pressure of fire-extinguishing liquid. Here, high pressure means a pressure in the range of about 30 bar to about 300 bar, while the usual low pressure equipment only has a working pressure of about 5 to 10 bar. Preferably, at least one hydraulic accumulator is used as a liquid source for fire extinguishing, and the outlet lines of this hydraulic accumulator are connected with several sprinklers that can be opened automatically.

In many cases it is desirable to be able to start an entire group of usually adjacent sprinklers starting with one sprinkler which is immediately activated by a misfire.

The present invention relates to a spray head for the above purpose. This sprinkler includes a valve stem part, which is pressed into the inlet of the sprinkler due to spring force, so that the valve stem part will keep the above inlet closed against the static pressure of the fire fighting equipment, but the valve stem part will yield at the pressure of the high-pressure liquid source. Claims 2 and 3 specify preferred embodiments.

The present invention will be described below with reference to a schematic preferred embodiment shown in the accompanying drawings, in which:

Figure 1 shows the valve in standby;

Figure 2 shows the above valve in its actuated state;

Figure 3 shows the connection diagram of the fire fighting equipment in standby state;

Fig. 4 to Fig. 6 have shown the first preferred embodiment of the spray heads in the standby state, individually opened state and group opened state respectively in the above equipment.

Figures 7 to 9 show the second preferred embodiment of the spray head in the same manner as Figures 4 to 6 .

Reference numeral 1 denotes a hydraulic accumulator with a relatively high charge pressure (eg 200 bar). The accumulator 1, hereinafter also referred to as the primary accumulator, comprises an outlet conduit 2, the wall of which is preferably provided with a plurality of openings for the respective Conveying the accumulator's fluid and mixture of fluid and driving gas. The outlet valve connected to the conduit 2 is generally indicated by reference numeral 3, the inlet of this valve is indicated by reference numeral 4, and the outlet is indicated by reference numeral 5. The outlet 5 is connected with several spray heads 26 to 29 that can be opened automatically through a lead-out line 25, as shown in FIG. 3 .

According to FIG. 1 , in the standby position of the valve 3 , the valve stem 6 closes the communication between the inlet 4 and the outlet 5 of the valve. The valve stem 6 has an axial through hole 7, which connects the outlet 5 with the liquid chamber 8, and the liquid chamber 8 is connected with a small (for example about 0.3 liters) hydraulic pressure accumulator 9, hereinafter, this pressure accumulator is also referred to as a secondary pressure accumulator.

Valve stem 6 comprises a head 10, and this head can move between the position shown in Figure 1 and the position shown in Figure 2 in liquid chamber 8 like a similar piston, at the position shown in above-mentioned Figure 1, The head 10 is close to the valve housing containing the valve stem 6, thereby closing the communication between the inlet 4 and the outlet 5, and at the position shown in Figure 2 above, the head 10 is then close to the shoulder 11, so that The communication between inlet 4 and outlet 5 is opened.

In FIG. 1 , the valve stem 6 is held in place by the pressure of the liquid chamber 8 acting on the valve stem head 10 and by the spring 12 pressing on the valve stem head 10 . During the movement of the valve stem 6 , the pressure in the inlet 4 acting on the end of said valve stem and the pressure of the primary pressure accumulator acting on the annular shoulder 13 build up in opposite directions.

When the spray head connected to the outlet 5 is turned on, the secondary pressure accumulator 9 starts to deliver liquid to said spray head. As a result, the pressure in the liquid chamber 8 will drop rapidly, so the pressure accumulator 1 will generate pressure acting on the shoulder 13, and the valve stem will start to move to the right in Fig. 1, and, because the valve stem 6 The end towards the outlet 5 reaches the inlet 4, so this end is subjected to the pressure of the primary accumulator, and at the same time the valve stem is pushed against the stop 11 to the end position in FIG. 2 . The spring force of the spring 12 is preferably adjusted in such a way that it pushes the valve stem 6 backwards from the position shown in FIG. 2 to the position shown in FIG. 1 after the primary pressure accumulator has been discharged.

A check valve 14 located in the through hole 7 of the valve stem 6 prevents the pressure of the primary accumulator from entering the liquid chamber 8 in the position shown in FIG. 2 . Reference numeral 15 designates a pressure gauge, while reference numeral 16 designates a manually operable backup opening device which, in Figures 1 and 2, is closed and inoperative.

In the event of a fire, it is often advantageous to activate a set of these nozzles also with the release pipe integral. Spray heads 26 to 29 in Figure 3 are such a spray head assembly, and Figures 4 to 6 show a preferred embodiment of a spray head for this purpose.

The spray head has a common release tube 30, which engages with a first valve stem part 31 and is pushed by a spring 32, while the other end of the spring 32 makes a second valve stem part 33 tight. Affixed to the inlet opening of the sprinkler head. Adjust the spring force of the spring 32 in such a way that, according to FIG. When the valve 3 is in the state shown in FIG. 1 , the second valve stem part 33 is pressed against the inlet of the spray head. Accordingly, the valve stem member 33 keeps the communication with the spray head nozzle 34 closed.

In FIG. 5, the discharge tube 30 of the spray head 26 has been crushed or melted by the action of a nearby flame. The spring 32 has touched the stem part 31 downwards, and the stem part 33 has been able to hit the stop 35 mounted on the spray head housing under the effect of the pressure of the secondary pressure accumulator 9 . The communication between the inlet of the spray head 26 and its nozzle 34 is open.

Thus, as before, the valve 3 on the primary accumulator 1 will assume the state shown in FIG. 2 and the pressure of this accumulator will act on the nozzles 27, 28, and 29 at the inlet. As shown in Figure 6, for example, the valve stem member 33 of the spray head 29 will engage the stop 35 and the communication from the inlet of the spray head to the nozzle 34 will be open. Preferably adjust the elastic force of spring 32 in such a way: According to Fig. 6, the elastic force of this spring also can not crush release tube 30 under the fully compressed state; 15 bar.

Figures 7 to 9 show another embodiment which can be mounted on a wall and which works on the same principle as the previous embodiment described with reference to Figures 4 to 6 . Of course, the spray heads shown in FIGS. 4 to 9 can be used independently of the valves shown in FIGS. 1 and 2 , and the valves shown in FIGS. 1 and 2 do not include the spray heads shown in FIGS. 4 to 9 in their components.

For large installations, the invention can be applied to any number of hydraulic accumulators and/or high pressure pumps. For spray heads, nozzles, group releases and other devices, in all cases apply the patents described in International Patent Applications PCT/FI92/00060, PCT/FI92/00122, PCT/FI92/00155, PCT/FI92/ 00156, PCT/FI92/00193, PCT/FI92/00123, PCT/FI92/00316, PCT/FI92/00317 and PCT/FI92/00330 have already been described.

Claims (3)

1, a kind of shower nozzle that is used in particular for having the fire-fighting equipment of extinguishing fluid high-voltage power supply is characterized in that:

It comprises valve rod parts (33), these valve rod parts are pressed in the inlet of described shower nozzle because of elastic force (32), thereby these valve rod parts (33) can make described inlet keep closing against the static of above-mentioned fire-fighting equipment or standby pressure, but these valve rod parts can be yielded to the pressure of high pressure liquid source, so that liquid is sent to the nozzle (34) of shower nozzle by complete releasing tube (30).

2, shower nozzle according to claim 1, it is characterized in that: said releasing tube (30) engages with one first valve rod parts (31), and be subjected to pushing of spring (32), the other end of spring (32) then makes one second valve rod parts (33) be close on the inlet drilling of described shower nozzle, and the inside motion under the pressure effect that has raise of the described second valve rod parts is configured to be subjected to the restriction of fixed stop (35) on the described shower nozzle outer cover.

3, as the shower nozzle as described in the claim 2, it is characterized in that: the elastic force of regulating spring (32) in such a way: when the second valve rod parts (33) are run into retainer (35), the releasing tube (30) of can under the compressive state of spring (32), not crushing.

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