EP2280768A1

EP2280768A1 - Extinguishing nozzle body

Info

Publication number: EP2280768A1
Application number: EP09737911A
Authority: EP
Inventors: Max Lakkonen
Original assignee: Fogtec Brandschutz GmbH and Co KG
Current assignee: Fogtec Brandschutz GmbH and Co KG
Priority date: 2008-05-02
Filing date: 2009-02-06
Publication date: 2011-02-09
Also published as: WO2009132867A1; CN102065954A; DE102008021925A1; US20110061879A1

Abstract

For fire-fighting purposes, an extinguishing nozzle body (2) for spraying an extinguishing fluid and a firefighting unit are proposed. The extinguishing nozzle body is characterized by at least two spray nozzles (4) disposed along the circumference of the extinguishing nozzle body (2), and at least one deflector (8) disposed in the region of the spray jet (6) of the extinguishing fluid exiting from the spray nozzles (4). Good firefighting is achieved in that a spray angle (10) of the spray jet relative to lateral surface of the extinguishing nozzle body (2), an angle of approach (12) of the deflector (8) relative to the direction of the spray jet (6), a distance (14) of the deflector (8) from the lateral surface of the extinguishing nozzle body (2), and a high pressure of the extinguishing fluid are set such that a cone-shaped spray pattern is obtained.

Description

Extinguishing nozzle body

The subject matter relates to an extinguishing nozzle body for spraying extinguishing fluid with at least two spray nozzles arranged along a circumference of the extinguishing nozzle body. The subject matter further relates to a firefighting device with a quenching nozzle body.

In all public areas, as well as in security-related areas, firefighting is of particular importance. For fire fighting today both sprinkler systems and water mist systems are used. The use of water mist systems has the advantage that firefighting can be done with very small amounts of extinguishing fluid. In particular, due to the very good cooling properties of fluid mist, the space surrounding the fire can be cooled well. In addition, the evaporation of the extinguishing fluid from the source of oxygen deprived, so that it is gradually stifled.

Particularly in tunnels, firefighting is becoming increasingly important. It must be avoided that flue gases spread within the tunnel. The known extinguishing mist systems prevent the formation of flue gases with simultaneous low use of fluid. Especially with widely branched systems, the low use of fluid is advantageous because the fluid reservoir and the piping must be aligned only for smaller volumes. The distribution of the extinguishing fluid in the spray pattern has proven to be an important parameter for the extinguishing properties. Depending on the application, either a directed spray pattern or a uniform distribution within the room is necessary. The spray pattern can be influenced by a suitable arrangement of the spray nozzles within the extinguishing nozzle body.

Since the spray pattern is of essential importance for the control success, it is the object of the invention to provide a uniform, conical spray pattern with little production effort.

This object is achieved with the aid of an extinguishing nozzle body, which has at least two spray nozzles arranged along a circumference of the extinguishing nozzle body, and at least one deflector arranged in the region of the spray jet of the extinguishing fluid emerging from the spray nozzles, a spray angle of the spray jet relative to the jacket surface of the extinguishing nozzle body, an angle of attack of the deflector relative to the direction of the

Spray jet, a distance of the deflector from the lateral surface of the extinguishing nozzle body and a pressure of the extinguishing fluid are adjusted so that sets a conical spray pattern.

It has been found that a conical spray pattern can be generated by a suitable choice of the spraying angle of the spray jet, the angle of attack of the deflector and the pressure. A deflector may in this case be arranged above the spray nozzles. A deflector may also be formed by an external surface. For example, an extinguishing nozzle body may be provided with extinguishing nozzles, which in Spray direction of a wall. The wall can then represent the deflector. Appropriate alignment between distance to the wall and impact angle allows adjustment of the spray pattern.

The spray angles can be such that the emerging extinguishing fluid impinges on the deflector surface shortly after exiting. The spray nozzles may in turn be designed in such a way that very small droplets are formed at the exit of the extinguishing fluid. These can be between 10μm and

500μm be large, but preferably between 30μm and lOOμm be large. The said droplet spectra may preferably form only after the impact of the spray jet with the deflector surface. These fluid droplets hit the deflector surface with high genetic energy and are deflected. In this case, a further splitting of the fluid droplets into even finer droplets can take place. In addition, by a suitable choice of the angle of attack of the deflector, the direction of the entire spray pattern of emerging from the spray nozzles extinguishing fluid can be varied. Depending on how far away the deflector is from the openings of the spray nozzles, a different droplet distribution in the spray pattern sets in.

An extinguishing nozzle body can be for example a extinguishing nozzle head, which is screwed into a supply line. It is also possible that the extinguishing nozzle body is a tube into which extinguishing nozzles are inserted, e.g. by drilling or screwing.

By a suitable choice of pressure, for example between

30 and 300 bar, the droplet size, as well as the angle of the conical spray pattern can be varied. Impression of 6-30 bar, preferably over 10 bar is also possible. The higher the pressure, the higher the kinetic energy at which the fluid droplets impinge on the deflector surface. As a result, both the rebound angle of the fluid droplets from the deflector surface and the droplet size can be adjusted to the deflector surface after the impact. By a suitable choice of the high pressure, the spray pattern conical, in particular conically equally distributed, are designed.

According to an advantageous embodiment, it is proposed that the spray angle of the spray jet is between 30 ° and 90 ° relative to the lateral surface of the extinguishing nozzle head. The openings of the spray nozzles can either be arranged vertically pointing out of the extinguishing nozzle head, or be arranged at an angle to the lateral surface of the extinguishing nozzle head. For example, it is possible to provide a V-groove in the lateral surface, and to arrange the spray nozzles in a wall of the V-groove. As a result, the spray angle of the spray jet relative to the lateral surface of the extinguishing nozzle head can be adjusted according to the angle of the V-groove. Depending on which angle is set, there is another conical spray pattern. In particular, at a large spray angle, for example around 90 °, a particularly uniform conical spray pattern is established.

According to a further advantageous embodiment, it is proposed that the angle of attack of the deflector is between 30 ° and 60 ° relative to the direction of the spray jet. The choice of the angle of attack also determines at what angle the fluid droplets impinge on the deflector surface. This makes it possible to set how big the On the other hand, the total opening angle of the conical spray pattern.

The distance of the deflector from the lateral surface of the spray head can according to an advantageous

Embodiment be between 0.5 and 5 cm. The closer the deflector surface is located to the spray nozzle, the higher the impact energy of the fluid droplets on the deflector surface. According to the impact energy, the droplet spectrum of the spray pattern changes. In order to obtain a cone-shaped spray pattern which is as uniform as possible, it is proposed according to an advantageous exemplary embodiment that the spray nozzles are arranged on the lateral surface of the extinguishing nozzle head at equal angular distances from one another, lying in one plane. On the one hand, the spray nozzles can be arranged in one plane. Regardless of the spray nozzles can be arranged at equal angular intervals to each other. Characterized in that the spray nozzles are arranged along the lateral surface suitable, different spray patterns can be adjusted. If the spray nozzles are arranged at equal angular distances from each other, a very even, cone-shaped spray pattern results.

According to an advantageous embodiment, it is proposed that the extinguishing nozzle head has a chamber which precedes the extinguishing nozzles in the flow direction of the extinguishing liquid. Extinguishing fluid can first flow into this chamber. In case of fire, the extinguishing fluid flows through the upstream chamber and is thereby evenly distributed to the spray nozzles. In order to achieve a good distribution of the fluid droplets within the space surrounding the fire, it is proposed that in the flow direction of the extinguishing fluid behind the spray nozzles additional spray nozzles are arranged in the lateral surface of the extinguishing nozzle head. These additional spray nozzles can, starting from the supply line of the extinguishing nozzle head, be arranged below the spray nozzles. The additional spray nozzles may for example be arranged such that the spray jet emerging from these additional spray nozzles no longer occurs on the deflector surface of the deflector. The

Additional spray nozzles may, for example, be arranged to spray extinguishing fluid with a different droplet spectrum than the spray nozzles. The additional spray nozzles can also be set up such that the spray jet emerging from them collides with the spray jet emerging from the spray nozzles and deflected by the deflector. This collision allows better droplet distribution to be achieved.

In order to be able to vary the spray pattern of the additional spray nozzles, as well as to adjust the spray angle of the additional spray nozzles, it is proposed according to an advantageous embodiment that the additional spray nozzles are arranged in a circumferential groove along the lateral surface of the extinguishing nozzle head.

A particularly evenly distributed spray pattern is achieved in that the additional spray nozzles are arranged at angular intervals offset from the spray nozzles. Here spray the additional spray nozzles in radial directions, which are not of the

Spray nozzles are covered themselves. The radial spray directions of the additional spray nozzles, starting from the extinguishing nozzle head, can according to this advantageous embodiment, offset from the radial spray direction of the spray nozzles.

Also, the auxiliary spray nozzles can be arranged along a pipe or hollow body so that they are aligned in one direction, for example to spray a wall.

A fine distribution of the fluid droplets is achieved in that the spray angles of the additional nozzles are such that the extinguishing fluid droplets of the extinguishing fluid emerging from the additional nozzles collide with the extinguishing fluid droplets emerging from the extinguishing nozzles and deflected by the deflector.

In order to achieve that emerging from the spray nozzles

Fluid droplets collide with the deflector is proposed according to an advantageous embodiment that the deflector has a with the angle of attack in the direction of the spray nozzles facing deflector surface.

In order to achieve that as far as possible all the fluid droplets emerging from the spray nozzles are deflected, it is proposed that the deflector be arranged around the circumference of the extinguishing nozzle head.

In order to ensure that extinguishing fluid escapes as quickly as possible in the case of a fire in the immediate vicinity of the extinguishing nozzle head at the corresponding extinguishing nozzle head, it is proposed that the extinguishing nozzle head has an integrated fire detection means. Such a fire detection means may for example be a glass bulb which bursts as the temperature rises. The glass bulb, for example, a Keep the spindle in a closed state. Bursting the glass bulb, the spindle is moved to an open state, so that extinguishing fluid can enter the chamber.

Another object is a fire fighting device with a high-pressure accumulator for extinguishing fluid and a high-pressure accumulator with at least one previously described extinguishing nozzle head connecting pipe.

In order to produce a fluid mist, it is proposed that the high-pressure accumulator has a working pressure of at least 100-150 bar. A pipe pressure in the pipeline can be at 10-20 bar.

Subsequently, the object is determined by a

Embodiments drawing showing explained. In the drawing show:

1 shows a quenching nozzle head according to an advantageous embodiment;

FIG. 2 shows an extinguishing nozzle head in the activated state; FIG.

3 shows an extinguishing nozzle head according to an advantageous embodiment in the activated state;

Fig. 4 is a fire fighting device.

In the figure 1 is a quenching nozzle head 2 with a supply line 3, which may be connected to a pipeline shown. The extinguishing nozzle head 2 is screwed to the supply line 3, for example. FIG. 1 also shows spray nozzles 4, a deflector 8, a spray angle 10, an angle of attack 12 and a plane 16 along which the spray nozzles 4 are arranged. Furthermore, a distance 14 between the lateral surface of the extinguishing nozzle head 2 and the deflector surface of the deflector 8 is shown.

It can be seen that the spray nozzles 4 are arranged at angular intervals in the radial direction to the extinguishing nozzle head. The spray nozzles 4 may be provided, for example, as holes within the extinguishing nozzle head 2. It is also possible that the spray nozzles 4 can be arranged as nozzle inserts, for example screwed, in the extinguishing nozzle head 2.

The spray nozzles 4 can be arranged such that a spray jet emerges in the direction 7 from the extinguishing nozzle head 2. The direction 7 is determined by the spray angle 10 of the spray. By suitable selection of the spray angle 10, an impact angle of the spray jet on the deflector surface of the deflector 8 can be determined.

The deflector 8 is arranged circumferentially around the circumference of the extinguishing nozzle head 2. At a distance from the extinguishing nozzle head 2, the deflector surface of the deflector 8 is inclined downwards. The angle of attack 12 of the downwardly inclined deflector surface of the deflector 8 can be varied according to the requirements of the spray pattern of the extinguishing nozzle head 2. The length of the downwardly facing deflector surface can be varied, as indicated by different lengths left and right of the central axis of the extinguishing nozzle head is. It is also possible to vary the lengths of the deflector surfaces pointing downwards along the circumference, so that the projection of the spray pattern can be varied. For example, it is possible to make the deflector surface shorter and in some areas with a different angle of attack than in other areas. This results in that the spray pattern can be varied according to the angles of attack.

In addition, the distance 14 can be varied. The smaller the distance 14 between the spray nozzle 4 and deflector surface of the deflector 8, the higher the impact energy of the

Extinguishing fluid on the deflector surface. Depending on how high the impact energy is, there is a greater or lesser splitting of the droplets into finer droplets.

Further, a glass bulb 24 is shown as

Can serve fire detection means. The glass bulb 24 may be such that it bursts when in the vicinity of the extinguishing nozzle head 2, an elevated temperature prevails. Due to the bursting of the glass bulb 2, a spindle, not shown, can be moved within the extinguishing nozzle head 2 in such a way that it enables fluid communication between the supply line 3 and the spray nozzles 4. The extinguishing fluid can then be conducted from the supply line 3 into the spray nozzles 4 and exit as a spray jet.

In the extinguishing nozzle head 2 is a chamber, not shown, which branches to the spray nozzles 4. With the help of the chamber, it is possible to allow a uniform fluid loading of the spray nozzles 4.

FIG. 2 shows an extinguishing nozzle head 2 in the activated state. In the activated state, the glass bulb 24 has burst, and Extinguishing fluid enters the extinguishing nozzle head 2 through the supply line 3. Through the chamber, the extinguishing fluid enters the spray nozzles 4 and exits the spray nozzles 4 as a spray jet 6. In FIG. 2, it can be seen that the spray steel 6 impinges on the deflector surface of the deflector 8 immediately after it leaves the spray nozzles 4. As a result, the spray steel is deflected and directed downward. The fluid droplets present in the spray jet are further broken by the impact and the result is a finely distributed spray pattern in the following. This spray pattern is characterized by a conical, uniform distribution of fluid droplets.

FIG. 3 shows a further exemplary embodiment of an extinguishing nozzle head 2. It can be seen that a circumferential groove 20 is provided in the extinguishing nozzle head 2 below the spray nozzles 4. In the circumferential groove 20 additional nozzles 18 are provided. The additional nozzles 18 are offset from the spray nozzles 4 in the radial direction. The auxiliary nozzles 18 spray fluid droplets with a spray angle 22 away from the spray head 2. The size of the fluid droplets can be determined by suitable

Adjust the setting of the openings of the additional nozzles 8. In the activated state, i. After bursting of the glass bulb 24 extinguishing fluid flows both from the spray nozzles 4 and from the additional nozzles 18. As can be seen, the spray jets of the auxiliary nozzles 18 and the deflected by the deflector 8 spray jets of extinguishing nozzles 4 in the vicinity of the extinguishing nozzle head 2 cross. When crossing the spray jets fluid droplets mix, resulting in a further nebeiförmigen distribution of the extinguishing fluid.

FIG. 4 shows a firefighting system with a high pressure fluid reservoir 26, an activation valve 30, a Pipe 28, fire detectors 32, and extinguishing nozzle heads 2 connected to the pipes 28. As can be seen, the pipe 28 branches into various sub-distributions, at which a different number of extinguishing nozzle heads 2 can be arranged. The pipeline 28 may be arranged, for example, in a tunnel system. In a tunnel system, the subbranches can protect different areas of the tunnel from fire with the help of extinguishing nozzle heads 2. In each area, for example, a fire detector 32 may be arranged. It is also possible that activation of only individual areas by means of the fire detectors 32 is possible.

In case of fire, a fire is detected by a fire detector 32 and the activation valve 30 is opened. Extinguishing fluid flows under high pressure, for example between 10 and 150 bar from the high-pressure fluid container 26 into the pipe 28 and then into the extinguishing nozzle heads 2. The extinguishing nozzle heads 2 spray the extinguishing fluid as a finely divided mist with droplet sizes between 10 and 500 microns, preferably between

30μm and 100μm. The droplet spectrum may vary, depending on the setting of the extinguishing nozzles 4 and the additional nozzles 18, as well as the arrangement of the spray angle of the extinguishing nozzles 4, the angle of attack of the deflector 8, the distance of the deflector from the spray nozzles 4, the arrangement of the additional nozzles 18, and the Spray angle of the additional nozzles 18. Depending on the application, different spray patterns may be necessary in different areas of the tunnel system, which can be adjusted by means of suitable extinguishing nozzle heads 2. With the help of the subject extinguishing nozzle head, a fire fighting for different types of fires can be adjusted based on the variation of various parameters of the extinguishing nozzle head.

Claims

claims

1. extinguishing nozzle body for spraying extinguishing fluid with at least two spray nozzles (4) arranged along a circumference of the extinguishing nozzle body (2), - at least one deflector (8) arranged in the region of the spray jet (6) of the extinguishing fluid emerging from the spray nozzles (4), wherein a spray angle (10) of the spray jet relative to the lateral surface of the extinguishing nozzle body (2), an angle of incidence (12) of the deflector (8) relative to the direction of

Spray jet (6), a distance (14) of the deflector (8) from the lateral surface of the extinguishing nozzle body (2) and a pressure of the extinguishing fluid are adjusted such that a conical spray pattern is established.

2. extinguishing nozzle body according to claim 1, characterized in that the spray angle (10) of the spray jet (6) is between 30 ° and 90 ° relative to the lateral surface of the extinguishing nozzle body (2).

3. extinguishing nozzle body according to claim 1 or 2, characterized in that the angle of attack (12) of the deflector between 30 ° and 60 ° relative to the direction of the spray jet (6).

4. extinguishing nozzle body according to one of the preceding claims, characterized in that the distance (14) of the deflector (8) from the lateral surface of the spray head (2) is between 0.5 and 5 cm.

5. extinguishing nozzle body according to one of the preceding claims, characterized in that the spray nozzles (4) on the lateral surface of the extinguishing nozzle body (2), in a plane

(16) lying, are arranged at equal angular intervals to each other.

6. extinguishing nozzle body according to one of the preceding claims, characterized in that the extinguishing nozzle body (2) has an extinguishing nozzle in the flow direction of the extinguishing liquid upstream chamber.

7. extinguishing nozzle body according to one of the preceding claims, characterized in that in the flow direction of the extinguishing fluid after the spray nozzles (4) Zusatzsprühdüsen (18) in the lateral surface of the extinguishing nozzle body (2) are arranged.

8. extinguishing nozzle body according to one of the preceding claims, characterized in that the Zusatzsprühdüsen (18) in a along the lateral surface of the extinguishing nozzle body (2) encircling groove (20) are arranged.

9. extinguishing nozzle body according to one of the preceding claims, characterized in that the additional spray nozzles (18) offset at angular intervals to the spray nozzles (4) are arranged.

10. extinguishing nozzle body according to one of the preceding claims, characterized in that the spray angle (22) of the additional nozzles (18) are such that the

Löschfluidtrδpfchen the emerging from the additional nozzles (18) extinguishing fluid with those from the extinguishing nozzles (4) leaked, deflected by the deflector (8) Löschfluidtröpfchen collide.

11. extinguishing nozzle body according to one of the preceding claims, characterized in that the deflector (8) has a with the angle of attack (12) in the direction of the spray nozzles (4) facing deflector surface.

12. extinguishing nozzle body according to one of the preceding claims, characterized in that the deflector (8) to the

Circumference of the extinguishing nozzle body (2) is arranged around.

13. extinguishing nozzle body according to one of the preceding claims, characterized in that the extinguishing nozzle body (2) has an integrated fire detection means (24).

14. Fire fighting equipment with a high-pressure accumulator

(26) for extinguishing fluid and a high-pressure accumulator (26) with at least one extinguishing nozzle body (2) according to claim 1 connecting pipe (28).

15. Fire-fighting device according to claim 14, characterized in that the high pressure accumulator has a boost pressure of at least 100 bar.