Foam fire extinguisher direct current foam nozzle

Abstract

A direct-flow foaming nozzle for a foam fire extinguisher includes a nozzle body and a water outlet. The nozzle body is a cylinder, narrower at the bottom and wider at the top. Symmetrical air intake holes are provided on the upper surface of the cylinder. The water outlet is fixed to the upper end of the nozzle body, and a large filter screen is installed at the connection point. An internally threaded hole is provided in the lower inner cavity of the nozzle body. A small filter screen is installed at the top of the internally threaded hole. A clamping ring is threaded into the internally threaded hole and clamps the small filter screen. A spray hole for controlling the water flow rate and spray direction is provided at the top of the small filter screen. This invention provides a direct-flow foaming nozzle for a foam fire extinguisher that increases the foaming ratio.

Description

Technical Field

[0001] This utility model belongs to the field of foam fire extinguishers, and in particular to a foam fire extinguisher nozzle. Background Technology

[0002] Conventional foam fire extinguishers spray out foam extinguishing agent after internal pressurization. After the foam agent flows through the nozzle, the nozzle draws in air to foam. The characteristics of the nozzle are as follows: 1) The spray impact force is large, and the foam produced is large. The foam expansion ratio is generally small for the same volume, which increases the difficulty of extinguishing the fire; 2) The material is mainly plastic, which has poor dimensional accuracy, is not resistant to high temperature for a long time, and pollutes the environment. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing foam fire extinguisher nozzles with low foaming ratio, this utility model provides a direct foaming nozzle for foam fire extinguishers that increases the foaming ratio.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A direct-flow foaming nozzle for a foam fire extinguisher includes a nozzle body and a water outlet. The nozzle body is a cylinder that is narrower at the bottom and wider at the top. Symmetrical air intake holes are provided on the upper surface of the cylinder. The water outlet is fixed to the upper end of the nozzle body and a large filter screen is provided at the connection. The lower inner cavity of the nozzle body has an internal threaded hole. A small filter screen is provided at the top of the internal threaded hole. A clamping ring is threaded into the internal threaded hole and clamps the small filter screen. A spray hole for controlling the flow rate and spray direction of the water is provided at the top of the small filter screen.

[0006] Furthermore, the outlet of the internal flow channel of the nozzle body is connected to the inlet of the internal flow channel of the water outlet, and a cross-shaped metal pressure strip is provided at the inlet of the internal flow channel of the water outlet. The metal pressure strip is connected to the large filter screen and can fix the large filter screen.

[0007] Furthermore, the upper inner cavity of the nozzle body is inverted conical, and the middle inner cavity is cylindrical, with a spray hole provided between the bottom of the cylinder and the small filter screen.

[0008] Preferably, the spray hole has two spray holes, and the emission direction of the two spray holes is directly opposite to one of the cross-shaped water-dividing metal pressure strips, so that one of the cross-shaped water-dividing metal pressure strips can cut the water flow sprayed from the two spray holes in half.

[0009] Alternatively, there are four spray holes, with two spray holes facing outwards from one of the cross-shaped water-dividing metal strips, and the other two spray holes facing outwards from the other of the cross-shaped water-dividing metal strips.

[0010] Preferably, the injection hole is funnel-shaped, with a smaller top and a larger bottom.

[0011] The outlet is threaded to the upper end of the nozzle body, or it can be connected in other ways.

[0012] Preferably, there are four symmetrical air intake holes, and the four air intake holes are arranged in a cross-shaped symmetrical cutout.

[0013] The air intake hole is trapezoidal in shape.

[0014] The beneficial effects of this utility model are mainly reflected in the following aspects: 1. The large and small filters reduce the impact force of the extinguishing agent spray and generate secondary foaming, increasing the foaming ratio; 2. The extinguishing agent forms a siphon effect in the flow channel through two spray holes, drawing air in from four air intake holes, providing sufficient air for foaming; 3. The cross-shaped water-dividing metal pressure strip through which the extinguishing agent passes further divides the extinguishing agent stream after it has been buffered by the large and small filters, causing the divided extinguishing agent streams to collide with each other and foam again, thus reducing the impact force. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal structure of a DC foaming nozzle in a foam fire extinguisher.

[0016] Figure 2 This is a front view of the DC foam nozzle of a foam fire extinguisher.

[0017] Figure 3 This is a 3D view of the DC foam nozzle of a foam fire extinguisher.

[0018] Figure 4 This is a schematic diagram of a water-separating metal strip.

[0019] Figure 5 This is a cross-sectional view of the nozzle body 2.

[0020] Figure 6 This is a schematic diagram of the bottom of the injection hole.

[0021] Figure 7 This is a schematic diagram of the top of the injection port.

[0022] Figure 8 This is a schematic diagram of the clamping ring. Detailed Implementation

[0023] The present invention will now be further described with reference to the accompanying drawings.

[0024] Reference Figures 1 to 8A direct-flow foaming nozzle for a foam fire extinguisher includes a nozzle body 2 and a water outlet 1. The nozzle body 2 is a cylinder that is narrower at the bottom and wider at the top. Symmetrical air intake holes 8 are provided on the upper surface of the cylinder. The water outlet 1 is fixed to the upper end of the nozzle body 2 and a large filter screen 4 is provided at the connection. The lower inner cavity of the nozzle body 2 is provided with an internal threaded hole. A small filter screen 5 is provided at the top of the internal threaded hole. A clamping ring 3 is threaded into the internal threaded hole and clamps the small filter screen 5. A spray hole 7 for controlling the flow rate and spray direction of the water is provided at the top of the small filter screen 5.

[0025] In this embodiment, the water outlet 1 is sealed to the nozzle body 2 by threads or other means, and the large filter screen 4 is clamped; the nozzle body 2 is connected to the clamping ring 3 by threads or other means, and the small filter screen 5 is clamped.

[0026] Furthermore, the outlet of the internal flow channel of the nozzle body 2 is connected to the inlet of the internal flow channel of the outlet 1, and a cross-shaped water-dividing metal pressure strip 6 is provided at the inlet of the internal flow channel of the outlet. The water-dividing metal pressure strip 6 is connected to the large filter screen 4 and can fix the large filter screen 4.

[0027] Furthermore, the upper inner cavity of the nozzle body 2 is inverted conical, and the middle inner cavity is cylindrical. An injection hole 7 is provided between the bottom of the cylinder and the small filter screen 5. The injection hole 7 can be one, two, or four.

[0028] Preferably, the spray holes 7 have two spray holes whose emission directions are directly opposite one of the cross-shaped water-dividing metal strips 6, so that one of the cross-shaped water-dividing metal strips 6 can cut the water flow sprayed from the two spray holes 7 in half.

[0029] Alternatively, there may be four spray holes 7, with two spray holes having their emission direction aligned with one of the cross-shaped water-dividing metal strips 6, and the other two spray holes having their emission direction aligned with the other of the cross-shaped water-dividing metal strips 6.

[0030] The injection hole 7 is funnel-shaped, with a smaller top and a larger bottom.

[0031] Preferably, the water outlet 1 is threaded to the upper end of the nozzle body 2, but other connection methods can also be used.

[0032] Preferably, there are four symmetrical air intake holes 8, and the four air intake holes 8 are arranged in a cross-shaped symmetrical hollow.

[0033] The air intake hole 8 is trapezoidal in shape.

[0034] In this embodiment, the clamping ring 3 is a hollow circular ring with a threaded outer ring, which connects to the water inlet portion of the nozzle body to clamp the 5 small filter screens. The large filter screen 4 is circular, and the large filter screen has the same mesh count as the small filter screens, but its diameter is larger than that of the small filter screens. The small filter screen 5 is also circular.

[0035] The working process of this embodiment is as follows: The premixed foam liquid first passes through the small filter screen 5 for the first foaming, while simultaneously reducing the impact force. Then, the foam liquid from the first foaming is sprayed through two spray holes 7 towards the large filter screen 4. During this process, a siphon effect is generated, drawing in sufficient air from the four air intake holes 8. The foam liquid is then mixed with the air and passed through the large filter screen 4 for the second foaming and a second reduction in impact force. After two foaming and impact reduction processes, the foam liquid is sprayed towards one of the cross-shaped water-dividing metal strips 6, which then split the water flow in two. The water then impacts the inner wall of the outlet 1 and reflects, undergoing a third foaming and a third reduction in impact force.

[0036] The embodiments described in this specification are merely examples of implementations of the inventive concept and are for illustrative purposes only. The scope of protection of this utility model should not be considered limited to the specific forms described in these embodiments; rather, it extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A straight stream foam nozzle for a foam fire extinguisher, characterized in that, The device includes a nozzle body and a water outlet. The nozzle body is a cylinder that is narrower at the bottom and wider at the top. Symmetrical air intake holes are provided on the upper surface of the cylinder. The water outlet is fixed to the upper end of the nozzle body and a large filter screen is provided at the connection. The lower inner cavity of the nozzle body has an internal threaded hole. A small filter screen is provided at the top of the internal threaded hole. A clamping ring is threaded into the internal threaded hole and clamps the small filter screen. A spray hole for controlling the flow rate and spray direction of the water is provided at the top of the small filter screen.

2. The foam fire extinguisher straight stream foam nozzle of claim 1 wherein, The outlet of the internal flow channel of the nozzle body is connected to the inlet of the internal flow channel of the water outlet, and a cross-shaped metal pressure strip is provided at the inlet of the internal flow channel of the water outlet. The metal pressure strip is connected to the large filter screen and can fix the large filter screen.

3. The foam fire extinguisher straight stream foam nozzle of claim 2 wherein, The upper inner cavity of the nozzle body is inverted conical, and the middle inner cavity is cylindrical. An injection hole is provided between the bottom of the cylinder and the small filter screen.

4. The foam fire extinguisher straight stream foam nozzle of claim 3 wherein, The spray hole has two spray holes, and the direction of the two spray holes is directly opposite one of the cross-shaped water-dividing metal pressure strips, so that one of the cross-shaped water-dividing metal pressure strips can cut the water flow sprayed from the two spray holes in half.

5. The foam fire extinguisher straight stream foam nozzle of claim 3 wherein, There are four spray holes, two of which are aligned with one of the cross-shaped water-dividing metal strips, and the other two are aligned with the other cross-shaped water-dividing metal strip.

6. Foam fire extinguisher straight flow nozzle according to one of claims 1 to 5, characterized in that The injection hole is funnel-shaped, with a smaller top and a larger bottom.

7. The foam extinguisher direct-flow foaming nozzle as described in any one of claims 1 to 5, characterized in that, The water outlet is threadedly connected to the upper end of the nozzle body.

8. A straight stream foam discharge nozzle for a foam fire extinguisher according to any one of claims 1 to 5, characterised in that, There are four symmetrical air intake holes, which are arranged in a cross-shaped symmetrical cutout.

9. The foam fire extinguisher straight stream foam nozzle of claim 8 wherein, The air intake hole is trapezoidal in shape.

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