A handheld foam gun with adjustable foaming ratio

Abstract

This invention provides a handheld foam gun with adjustable expansion ratio, comprising: a gun body, a gun barrel, a first perforated plate, a second perforated plate, and an air jet ring. The gun body has a threaded interface and a manual valve on its rear side, and is connected to the gun barrel on its front side. A movable groove is formed inside the gun body, with the first and second perforated plates arranged on both sides of the movable groove. The air jet ring is disposed inside the gun body. This invention solves the problem that current foam guns can only spray air foam with a single expansion ratio, thus improving the applicability of foam guns.

Description

Technical Field

[0001] This utility model relates to the field of fire-fighting equipment technology, and in particular to a handheld foam gun with adjustable foaming ratio. Background Technology

[0002] A foam gun is a type of firefighting equipment, consisting of a barrel, nozzle, gun body, and connector. For ease of operation, it is usually also equipped with a handle / wheel and valves. During operation, the foam gun is connected to a fire hose via the threaded connector. The foam mixture is sprayed through the nozzle into the barrel, drawing in air to create air foam, which is then expelled from the barrel to extinguish the fire. Foam guns can be used to extinguish Class A, B, and C liquid fires or to spray water to extinguish general solid fires.

[0003] Existing foam guns can only spray foam with a single expansion ratio, making them unsuitable for the varied demands of complex fires. Therefore, designing a handheld foam gun with adjustable expansion ratio is essential. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a handheld foam gun with adjustable foaming ratio.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides a handheld foam gun with adjustable foaming ratio, including: gun body, gun barrel, first orifice plate, second orifice plate, and air jet ring. The gun body is provided with a threaded interface and a manual valve on the rear side, and is connected to the gun barrel on the front side. A movable groove is opened in the gun body, and the first orifice plate and the second orifice plate are provided on both sides of the movable groove. The air jet ring is provided inside the gun body.

[0007] Preferably, the first and second perforated plates have through holes evenly distributed in a ring, and the through holes are the same size and corresponding in position. The first perforated plate is provided with a limit post to limit the angle of rotation of the second perforated plate along the axis.

[0008] Preferably, the jet ring is connected to the air supply device via an air inlet connector.

[0009] Preferably, the front end of the gun barrel is provided with a foaming net via a locking mechanism.

[0010] Preferably, a grip is provided on the lower side of the gun body.

[0011] According to the specific embodiments provided by this utility model, the following technical effects are disclosed:

[0012] This invention provides a handheld foam gun with adjustable expansion ratio, comprising: a gun body, a gun barrel, a first perforated plate, a second perforated plate, and an air jet ring. The gun body has a threaded interface and a manual valve on its rear side, and is connected to the gun barrel on its front side. A movable groove is formed inside the gun body, with the first and second perforated plates arranged on both sides of the movable groove. The air jet ring is disposed inside the gun body. This invention solves the problem that current foam guns can only spray air foam with a single expansion ratio, thus improving the applicability of foam guns. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a front view of a handheld foam gun with adjustable foaming ratio according to an embodiment of the present invention.

[0015] Figure 2 This is a perspective view of a handheld foam gun with adjustable foaming ratio, according to an embodiment of the present invention.

[0016] Figure 3 This is a cross-sectional view of a handheld foam gun with adjustable foaming ratio, according to an embodiment of the present invention.

[0017] Reference numerals: 1. Gun body; 2. First perforation plate; 3. Second perforation plate; 4. Jet ring; 5. Barrel; 6. Pipe thread interface; 7. Manual valve; 8. Foaming mesh; 9. Air inlet connector; 10. Locking mechanism; 11. Grip. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] The purpose of this invention is to provide a handheld foam gun with adjustable expansion ratio, which solves the problem that current foam guns can only spray air foam with a single expansion ratio, thus improving the applicability of the foam gun.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model provides a handheld foam gun with adjustable foaming ratio, including: gun body 1, gun barrel 5, first perforated plate 2, second perforated plate 3, and air jet ring 4. The gun body 1 is provided with a threaded interface 6 and a manual valve 7 on the rear side, and is connected to the gun barrel 5 on the front side. A movable groove is opened in the gun body 1, and the first perforated plate 2 and the second perforated plate 3 are arranged on both sides of the movable groove. The air jet ring 4 is arranged inside the gun body 1.

[0022] The first perforated plate 2 and the second perforated plate 3 have through holes evenly distributed in a ring, and the through holes are the same size and corresponding in position. The first perforated plate 2 is provided with a limit post to limit the angle of rotation of the second perforated plate 3 along the axis.

[0023] The jet ring 4 is connected to the air supply equipment via the air inlet connector 9.

[0024] The front end of the barrel 5 is provided with a foaming net 8 via a locking mechanism 10.

[0025] A grip 11 is provided on the lower side of the gun body 1.

[0026] The usage process of this utility model is as follows: When spraying low-expansion foam, the second orifice plate 3 is rotated to position itself that blocks the diversion hole of the first orifice plate 1, with only the middle hole aligned and unobstructed. The foam mixture enters the gun body 1 through the inlet and forms a single jet after being sprayed out from the orifice plate. The normal pressure air outside the foam gun is drawn into the gun body 1 due to the negative pressure generated by the jet. The foam mixture foams and is sprayed out from the nozzle. Due to the limited specific surface area of ​​the jet, the sprayed foam is low-expansion foam. When spraying medium-expansion foam liquid, the second orifice plate 3 is rotated to align and unobstructed the middle hole and the diversion hole. The foam mixture enters the gun body 1 through the inlet and is sprayed out from the orifice plate. Then a composite jet is formed with a main jet in the middle and branch jets around it, which increases the specific surface area of ​​the mixture. The normal pressure air outside the foam gun is drawn into the gun body 1 due to the negative pressure generated by the jet. The foam mixture undergoes a first foaming. The pressurized gas generated by the gas supply equipment is injected into the foam mixture through the jet ring 4 for a second foaming. The gas-liquid mixture passes through the nozzle with the foaming net 8. After being blocked and stretched by the foaming net, the gas and liquid phases are further stirred and mixed. The foam mixture undergoes a third foaming. Due to the increased specific surface area, the injection of negative and positive pressure gas, and the stirring and foaming of the foaming net, the sprayed foam is medium-expansion foam.

[0027] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0028] This document uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. Furthermore, those skilled in the art will recognize that, based on the ideas of this utility model, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A hand held adjustable expansion foam gun characterized by, include: The gun body comprises a gun body, a gun barrel, a first perforated plate, a second perforated plate, and an air jet ring. The rear side of the gun body is provided with a threaded interface and a manual valve, and the front side is connected to the gun barrel. A movable groove is formed inside the gun body, and the first perforated plate and the second perforated plate are provided on both sides of the movable groove. The air jet ring is provided inside the gun body.

2. The hand held adjustable expansion ratio foam gun of claim 1 wherein, The first and second perforated plates have through holes evenly distributed in a ring, and the through holes are the same size and corresponding in position. The first perforated plate is provided with a limit post to limit the angle of rotation of the second perforated plate along the axis.

3. The hand held adjustable expansion foam nozzle of claim 1 wherein, The jet ring is connected to the air supply equipment via an air inlet connector.

4. The hand held adjustable expansion ratio foam gun of claim 1 wherein, The front end of the gun barrel is fitted with a foaming net via a locking mechanism.

5. The hand held adjustable expansion foam nozzle of claim 1 wherein, A grip is provided on the lower side of the gun body.

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