Foam extinguisher direct current foam nozzle

Abstract

Direct-flow foam nozzle for foam extinguishers, characterized in that it comprises a nozzle body and a water outlet, wherein the nozzle body is a cylindrical body tapering downwards and having a wider upper part, the upper surface of the cylinder being provided with symmetrical air inlet holes; the water outlet is attached to the upper end of the nozzle body, with a large filter screen arranged at the connection point; the lower inner chamber of the nozzle body is provided with an internal thread, at the upper end of which a small filter screen is arranged; a pressure ring is screwed into the internal thread and secures the small filter screen; spray holes are arranged at the upper end of the small filter screen to control the flow rate and spray direction of the water.

Description

TECHNICAL AREA

[0001] This utility model relates to the field of foam extinguishers, in particular a foam extinguisher nozzle. BACKGROUND

[0002] Conventional foam extinguishers spray foaming agent after an internal pressure increase. The foaming agent passes through the nozzle, which draws in air to create foam. The characteristics of such nozzles are as follows: 1) High injection force, resulting in large foam bubbles and, for the same volume, a generally low foam density, which increases the difficulty of extinguishing the fire; 2) The material is mainly plastic, with poor dimensional accuracy, low resistance to prolonged high temperatures, and environmental pollution. SPECIFIC EXECUTION FORMS

[0003] To overcome the weakness of a low foam level in existing foam extinguisher nozzles, this utility model provides a direct flow foam nozzle for foam extinguishers that increases the foam level.

[0004] The technical solution applied to solve the technical problem of this utility model is as follows: A direct-flow foam nozzle for foam extinguishers comprises a nozzle body and a water outlet. The nozzle body is a cylindrical body that tapers downwards and a wider upper section, with the upper surface of the cylinder featuring symmetrical air inlet holes. The water outlet is attached to the upper end of the nozzle body. A large filter screen is positioned at the connection point. The lower inner chamber of the nozzle body has an internal thread, at the upper end of which a small filter screen is located. A pressure ring is screwed into the internal thread and secures the small filter screen. Spray holes are arranged at the upper end of the small filter screen to control the flow rate and spray direction of the water.

[0005] Furthermore, the outlet of the inner flow channel of the nozzle body is connected to the inlet of the inner flow channel of the water outlet, and a cross-shaped water-dividing metal strip is arranged at the inlet of the inner flow channel of the water outlet, wherein the water-dividing metal strip is connected to the large filter screen and can fix the large filter screen.

[0006] Furthermore, the upper inner chamber of the nozzle body is inversely conical, the middle inner chamber is cylindrical, and spray holes are arranged between the bottom of the cylindrical chamber and the small filter screen.

[0007] Preferably, there are two injection holes whose ejection direction is aligned with one of the wings of the cross-shaped water-dividing metal strip, so that one wing of the cross-shaped water-dividing metal strip can divide the water stream ejected from the two injection holes into two.

[0008] Alternatively, there are four injection holes, with the ejection direction of two injection holes aligned with one wing of the cross-shaped water-dividing metal strip and the ejection direction of the other two injection holes aligned with another wing of the cross-shaped water-dividing metal strip.

[0009] Preferably, the injection holes are funnel-shaped, with a smaller upper part and a larger lower part.

[0010] The water outlet is screwed onto the top of the nozzle body or can be connected in another way.

[0011] Preferably, there are four symmetrical air inlet holes, wherein the four air inlet holes are arranged in a cross-shaped, symmetrical cavity pattern.

[0012] The air intake holes are trapezoidal.

[0013] The advantageous effects of this utility model are primarily as follows: The large and small filter screens reduce the impact force of the discharged extinguishing agent and generate secondary foaming, thereby increasing the foam expansion factor. The extinguishing agent passes through two spray holes, creating a siphon effect in the flow channel, drawing in air through the four air inlet holes to provide sufficient air for foaming. The extinguishing agent then passes through the cross-shaped, blade-like water-dividing metal strip, which again divides the column of extinguishing agent that has passed through the large and small filter screens after being buffered. The divided flow columns collide, resulting in additional foaming and further reducing the impact force. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic diagram of the internal structure of the direct flow foam nozzle for foam extinguishers. Fig. Figure 2 is a front view of the direct flow foam nozzle for foam extinguishers. Fig. Figure 3 is a perspective view of the direct flow foam nozzle for foam extinguishers. Fig. Figure 4 is a schematic diagram of the water division metal strip. Fig. 5 is a cross-section of the nozzle body. Fig. Figure 6 is a bottom view of the injection holes. Fig. Figure 7 is a top view of the injection holes. Fig. Figure 8 is a schematic diagram of the pressure ring. DETAILED DESCRIPTION OF PREFERRED EXECUTION FORMS

[0014] This utility model is described in more detail below with reference to the accompanying drawings.

[0015] With reference to the Fig. 1 to Fig.Figure 8 comprises a direct-flow foam nozzle for foam extinguishers, a nozzle body (2), and a water outlet (1). The nozzle body (2) is a cylindrical body that tapers downwards and has a wider upper section, the upper surface of which has symmetrical air inlet holes (8). The water outlet (1) is attached to the upper end of the nozzle body (2), with a large filter screen (4) located at the connection point. The lower inner chamber of the nozzle body (2) has an internal thread, at the upper end of which a small filter screen (5) is located. A pressure ring (3) is screwed into the internal thread and secures the small filter screen (5). Spray holes (7) are arranged at the upper end of the small filter screen (5) to control the flow rate and spray direction of the water.

[0016] In this embodiment, the water outlet (1) and the nozzle body (2) are connected via a thread or other sealed connection and secure the large filter screen (4). The nozzle body (2) and the pressure ring (3) are connected via a thread or other connection and secure the small filter screen (5).

[0017] Furthermore, the outlet of the inner flow channel of the nozzle body (2) is connected to the inlet of the inner flow channel of the water outlet (1), and a cross-shaped water-dividing metal strip (6) is arranged at the inlet of the inner flow channel of the water outlet. The water-dividing metal strip (6) is connected to the large filter screen (4) and can fix the large filter screen (4).

[0018] Furthermore, the upper inner chamber of the nozzle body (2) is inversely conical, the middle inner chamber is cylindrical, and spray holes (7) are arranged between the bottom of the cylindrical chamber and the small filter screen (5). The spray holes (7) can be one, two, or four.

[0019] Preferably there are two injection holes (7) whose ejection direction is aligned with one of the wings of the cross-shaped water-dividing metal strip (6), so that one wing of the cross-shaped water-dividing metal strip (6) can divide the water stream ejected from the two injection holes (7) into two.

[0020] Alternatively, there are four injection holes (7), wherein the ejection direction of two injection holes is aligned with one wing of the cross-shaped water-dividing metal strip (6) and the ejection direction of the other two injection holes is aligned with another wing of the cross-shaped water-dividing metal strip (6).

[0021] The injection holes (7) are funnel-shaped, with a smaller upper part and a larger lower part.

[0022] Preferably the water outlet (1) is screwed onto the upper end of the nozzle body (2) or can be connected in another way.

[0023] Preferably there are four symmetrical air inlet holes (8), wherein the four air inlet holes (8) are arranged in a cross-shaped, symmetrical cavity pattern.

[0024] The air inlet holes (8) are trapezoidal.

[0025] In this embodiment, the pressure ring (3) is a hollow, annular structure with an external thread, which is connected to the water inlet section of the nozzle body to secure the small filter screen (5). The large filter screen (4) is circular, with the same mesh size as the small filter screen (5), but the diameter of the large filter screen is larger than that of the small filter screen (5). The small filter screen (5) is also circular.

[0026] The operating process of this embodiment is as follows: The premixed foam liquid first passes through the small filter screen (5) for initial foam formation, while the impact force is simultaneously reduced. It then passes through two spray holes (7) to direct the initially foamed liquid to the large filter screen (4). During this process, a siphon effect occurs, drawing in sufficient air through the four air inlet holes (8). The foam liquid mixes with the air and passes through the large filter screen (4) for secondary foam formation, further reducing the impact force. After two foam formations and a reduction in impact force, the foam liquid is directed onto a vane of the cross-shaped water-dividing metal strip (6), which splits the flow in two. The flow strikes the inner wall of the water outlet (1) and is reflected, resulting in a third foam formation and further reducing the impact force.

[0027] The contents described in the exemplary embodiments of this description are merely a list of the implementation forms of the utility model concept and serve only for illustrative purposes. The scope of protection of this utility model should not be considered limited to the specific forms described in this exemplary embodiment. The scope of protection of this utility model also extends to equivalent technical means that skilled persons may devise on the basis of the utility model concept.

Claims

[1] Direct flow foam nozzle for foam extinguishers, characterized by that it comprises a nozzle body and a water outlet, the nozzle body being a cylindrical body tapering downwards with a wider upper part, the upper surface of the cylinder being provided with symmetrical air inlet holes; the water outlet is attached to the upper end of the nozzle body, with a large filter screen arranged at the connection point; the lower inner chamber of the nozzle body is provided with an internal thread, at the upper end of which a small filter screen is arranged; a pressure ring is screwed into the internal thread and secures the small filter screen; spray holes are arranged at the upper end of the small filter screen to control the flow rate and spray direction of the water. [2] Direct flow foam nozzle for foam extinguisher according to claim 1, characterized by, that the outlet of the inner flow channel of the nozzle body is connected to the inlet of the inner flow channel of the water outlet and a cross-shaped water-dividing metal strip is arranged at the inlet of the inner flow channel of the water outlet, wherein the water-dividing metal strip is connected to the large filter screen and can fix the large filter screen. [3] Direct flow foam nozzle for foam extinguisher according to claim 2, characterized by , that the upper inner chamber of the nozzle body is inversely conical, the middle inner chamber is cylindrical, and spray holes are arranged between the bottom of the cylindrical chamber and the small filter screen. [4] Direct flow foam nozzle for foam extinguisher according to claim 3, characterized by, that there are two ejection holes whose ejection direction is aligned with one of the wings of the cross-shaped water-dividing metal strip, so that one wing of the cross-shaped water-dividing metal strip can divide the water stream ejected from the two ejection holes into two. [5] Direct flow foam nozzle for foam extinguisher according to claim 3, characterized by , that there are four injection holes, the ejection direction of two injection holes being aligned with one wing of the cross-shaped water-dividing metal strip, and the ejection direction of the other two injection holes being aligned with another wing of the cross-shaped water-dividing metal strip. [6] Direct flow foam nozzle for foam extinguishers according to one of claims 1 to 5, characterized by that the injection holes are funnel-shaped, with a smaller upper part and a larger lower part. [7] Direct flow foam nozzle for foam extinguishers according to one of claims 1 to 5, characterized bythat the water outlet is screwed onto the upper end of the nozzle body. [8] Direct flow foam nozzle for foam extinguishers according to one of claims 1 to 5, characterized by , that there are four symmetrical air inlet holes, the four air inlet holes being arranged in a cross-shaped, symmetrical cavity pattern. [9] Direct flow foam nozzle for foam extinguisher according to claim 8, characterized by that the air intake holes are trapezoidal.

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