Medium-expansion foam gun and movable foam fire extinguishing device

Abstract

According to the medium-expansion foam gun and the movable foam fire extinguishing device provided by the utility model, the thick neck part, the gradual change part and the thin neck part are arranged in the medium-expansion foam gun, and the foam liquid self-suction port is communicated with the thin neck part, so that when water flows through the thin neck part, fire extinguishing foam liquid is automatically sucked, and the purposes of self-suction of foam and fire extinguishing are achieved; the water and the fire extinguishing foam liquid are directly mixed to obtain the foam mixed solution, so that the mixing steps are reduced, and the preparation flexibility of the foam mixed solution is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of fire extinguishing, especially relates to a medium expansion foam gun and mobile foam fire extinguishing device. BACKGROUND

[0002] The medium expansion foam gun is commonly used for putting out fires in buildings and warehouses such as petroleum chemical industry, machinery manufacturing industry, production workshop, petrochemical processing production site, equipment warehouse, pump station, compressor station, airplane hangar, device fire, flowing fire, shopping mall, garage, oil depot, building with light metal structure, warehouse storing flammable liquid and soluble liquid, and warehouse storing important equipment which avoids using a large amount of water to extinguish fire, and can realize three-dimensional foam fire extinguishing in limited space such as building and has obvious fire extinguishing effect.

[0003] When the foam enters the combustion area, the heat is absorbed and decomposed, the foam is broken, and the mixed solution is separated out to play a role in cooling and extinguishing fire, and the water in the mixed solution is evaporated to occupy space volume to play a role in suffocating and extinguishing fire.

[0004] However, in the prior art, when the fireman uses the foam gun to extinguish fire, the water and the fire extinguishing foam liquid need to be mixed in advance to obtain a foam mixed solution, and then the foam mixed solution is input into the pipeline of the foam gun to spray and extinguish fire, so that the operation is not flexible and convenient, and the steps are redundant.

[0005] Therefore, it is urgent to provide a medium expansion foam gun and mobile foam fire extinguishing device to overcome the above defects. SUMMARY

[0006] The utility model aims at providing a medium expansion foam gun and mobile foam fire extinguishing device which can solve the above technical problems.

[0007] According to one aspect of the utility model, a medium expansion foam gun for fire fighting is provided, which comprises a medium expansion foam gun main body, the medium expansion foam gun main body comprises a nozzle assembly, characterized in that the nozzle assembly comprises a nozzle main body, the nozzle main body further comprises a nozzle shell, a foam liquid self-suction port and a liquid pipeline, the liquid pipeline penetrates the central axis of the nozzle shell, the liquid pipeline comprises a thick neck part, a gradual change part and a thin neck part, the thick neck part is located at the rear end of the nozzle main body and is used for receiving water from outside, one end of the gradual change part is in communication with the thick neck part, and the other end is in communication with the thin neck part, the thin neck part is located at the front end of the nozzle main body, and the foam liquid self-suction port is located at the side of the nozzle shell and extends to the thin neck part and is in communication with the thin neck part.

[0008] Preferably, the nozzle assembly further comprises a nozzle gland, which is located at the front end of the nozzle assembly; the nozzle gland has a gland opening, which is located at the center of the nozzle gland and corresponds to the output end of the thin neck portion.

[0009] Preferably, the medium-expansion foam gun comprises a foaming cylinder, which is located in front of the nozzle body and is connected to the medium-expansion foam gun body through a plurality of supports.

[0010] Preferably, the foaming cylinder comprises a screen, which is located at and covers the output opening of the foaming cylinder; one end of the support is connected to the nozzle assembly, and the other end is connected to the connection between the screen and the foaming cylinder.

[0011] Preferably, one end of a part of the plurality of supports is connected to the nozzle assembly, and the other end is fixedly connected to the foaming cylinder close to the nozzle assembly.

[0012] Preferably, the nozzle body comprises a handle connecting portion, which is connected to the outer wall of the foaming cylinder through a lifting handle.

[0013] Preferably, the medium-expansion foam gun body comprises a ball valve assembly, which is located at the input end of the foam liquid self-suction opening.

[0014] According to another aspect of the present application, a mobile foam fire extinguishing device is provided, characterized in that it comprises the medium-expansion foam gun according to any one of the preceding aspects.

[0015] Preferably, the mobile foam fire extinguishing device further comprises a foam box and a self-suction pipe, one end of the self-suction pipe being inserted into the foam box, and the other end being in communication with the foam liquid self-suction opening.

[0016] Preferably, the ball valve assembly is located between the self-suction pipe and the foam liquid self-suction opening.

[0017] The present application provides a medium-expansion foam gun and a mobile foam fire extinguishing device, which sets a thick neck portion, a tapered portion and a thin neck portion in the medium-expansion foam gun, and makes the foam liquid self-suction opening in communication with the thin neck portion, so that the fire-fighting foam liquid is automatically sucked in when water flows through the thin neck portion, achieving self-suction of foam, directly mixing water and fire-fighting foam liquid to obtain a foam mixed solution, without the need for pre-mixing of water and fire-fighting foam liquid, reducing the mixing steps of water and fire-fighting foam liquid, and improving the flexibility of preparation of the foam mixed solution (i.e. water and foam mixed liquid). BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0019] Figure 1 Structure diagram of nozzle assembly of the middle-multiple foam gun involved in the present application;

[0020] Figure 2 Structure diagram of the middle-multiple foam gun involved in the present application;

[0021] Figure 3 Structure diagram of another perspective of the middle-multiple foam gun involved in the present application;

[0022] Figure 4 Structure diagram of the mobile foam extinguishing device involved in the present application.

[0023] 1. water tank; 2. self-suction pipe; 3. middle-multiple foam gun; 4. nozzle main body; 40. nozzle shell; 41. foam liquid self-suction port; 42. coarse neck part; 43. gradual change part; 44. thin neck part; 45. handle connecting part; 5. nozzle gland; 51. gland port; 6. ball valve assembly; 7. nozzle assembly; 8. support; 9. foaming cylinder; 10. screen; 11. handle; 12. middle-multiple foam gun main body. DETAILED DESCRIPTION

[0024] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings, in which the same or similar elements or elements having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, but cannot be interpreted as limiting the present application.

[0025] Those skilled in the art can understand that, unless specifically stated, the singular forms "a", "an" and "the" used herein also include the plural forms. It should be further understood that the use of the term "including" in the specification of the present application means that the features, integers, steps, operations, elements and / or components described exist, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we say an element is "connected" to another element, it can be directly connected to the other element or there can be intermediate elements. In addition, "connected" used herein can include wireless connection. The term "and / or" used herein includes all or any single unit and all combinations of the associated listed items.

[0026] As used herein, and unless otherwise indicated, all terms have their ordinary meanings. The description provided herein is based on the assumption that the devices described herein will be used in accordance with the practices of the art, and particular embodiments are described in this context. It is to be understood that the devices described herein can be used in other contexts and that the description herein is not intended to limit the scope of the devices described herein to the particular embodiments described herein.

[0027] According to an aspect of the present application, there is provided a medium expansion foam gun, Figure 1 Figure 1 is a schematic view of a medium expansion foam gun according to an embodiment of the present application.

[0028] As Figure 1As shown, the nozzle assembly 7 comprises a nozzle body 4 and a nozzle cover 5; the nozzle body 4 comprises a nozzle shell 40, a foam liquid self-suction port 41, a thick neck portion 42, a tapered portion 43, a thin neck portion 44, and a handle connecting portion 45. The nozzle shell 40 constitutes the shell of the nozzle body 4, and is used to protect the liquid pipeline inside the nozzle body 4 and prevent water, fire extinguishing foam liquid or foam mixture solution from leaking. The liquid pipeline is arranged along the central axis of the nozzle shell 40, and can receive and transmit water from outside or deliver the foam mixture solution formed inside the liquid pipeline to the outside of the nozzle body 4. The liquid pipeline comprises the thick neck portion 42, the tapered portion 43, and the thin neck portion 44. The thick neck portion 42 is arranged at the rear end of the nozzle body 4, i.e. the end away from the nozzle cover 5, and is used to receive and transmit water from outside, for example, external water source facilities such as fire hydrants, fire trucks, etc. can be connected to the thick neck portion 42 through a special pipeline. The tapered portion 43 is arranged between the thick neck portion 42 and the thin neck portion 44, and is axially connected to the thick neck portion 42 and the thin neck portion 44, and is used to transmit water. The thin neck portion 44 is axially connected to the tapered portion 43 at one end and connected to the nozzle cover 5 at the other end. The thin neck portion 44 is used to receive and transmit water from the tapered portion 43, and is also used to suck fire extinguishing foam liquid into the inside of the thin neck portion 44 through the foam liquid self-suction port 41, and then automatically mix the water and the fire extinguishing foam liquid to form a foam mixture solution inside the thin neck portion 44, and output the foam mixture solution. The foam liquid self-suction port 41 is arranged on one side of the nozzle shell 40, and is in communication with external fire extinguishing foam liquid supply facilities at one end and in communication with the middle section of the thin neck portion 44 at the other end. The foam liquid self-suction port 41 can be arranged perpendicular to the axis of the nozzle body 4, and is used to transmit fire extinguishing foam liquid. By such an arrangement, on the one hand, the fire extinguishing foam liquid is automatically sucked in when water flows through the liquid pipeline, forming a uniformly mixed foam mixture solution, and on the other hand, the range of the foam mixture solution is further, and the required liquid flow is significantly reduced, saving fire-fighting medium (such as water and fire-fighting foam liquid).

[0029] In the above embodiment, the Venturi principle is mainly used, which is based on the continuity equation A_1v_1=A_2v_2, where A is the cross-sectional area of the flow pipe, and v is the flow rate of the fluid. When water flows into the above-mentioned thick neck 42, the cross-sectional area A_1 here is relatively large, so the flow rate v_1 of the water is relatively small; that is, when the water flows through the above-mentioned tapered portion 43 to the above-mentioned thin neck 44, the cross-sectional area A_2 here gradually decreases, so the flow rate v_2 of the water gradually increases, at this time, the pressure of the above-mentioned thin neck 44 decreases with the increase of the flow rate v_2, generating a corresponding suction force, the external fire extinguishing foam is sucked into the inside of the above-mentioned thin neck 44 from the outside through the above-mentioned foam self-suction port 41, and automatically mixed with the water to form a foam mixed solution. At the same time, since the foam mixed solution is in the above-mentioned thin neck 44 with a small cross-sectional area, according to the Venturi principle, the flow rate of the foam mixed solution increases at this time, so that the range of the foam mixed solution is farther, and the required liquid flow is significantly reduced, saving the related fire-fighting medium. Specifically, the water flow first passes through the above-mentioned thick neck 42, the above-mentioned tapered portion 43 and the above-mentioned thin neck 44 in turn from the external water source facility, and at the above-mentioned thin neck 44, due to the Venturi principle, a suction force is generated in the middle section of the above-mentioned thin neck 44 (even if the water supply pressure is as low as 0.35 MPa, the foam liquid can be effectively sucked to form fire extinguishing foam), the fire-fighting foam is sucked into the above-mentioned thin neck 44 from the outside through the above-mentioned foam self-suction port 41, and at the same time, due to the presence of water, it is fully mixed with the fire-fighting foam to form a uniform foam mixed solution with a farther range.

[0030] In the above embodiment, the nozzle gland 5 is located at the front end of the nozzle assembly 7, that is, away from the thick neck 42, to improve the stability of the nozzle assembly 7. The nozzle gland 5 also includes a gland port 51 located at the center of the nozzle gland 5, corresponding to the output end of the thin neck 44, for receiving the foam mixed solution inside the thin neck 44 and spraying it outward.

[0031] Figure 2 The structure diagram of the medium-expansion foam gun involved in the present application, Figure 3 The structure diagram of the medium-expansion foam gun involved in the present application from another perspective. As Figure 2 and Figure 3As shown, the above-mentioned mid-expansion foam gun 3 comprises a mid-expansion foam gun body 12, a support 8, a foaming barrel 9 and a handle 11. The above-mentioned mid-expansion foam gun body 12 comprises a foam gun pipe and a foam gun handle, wherein the above-mentioned nozzle assembly 7 is located in the above-mentioned foam gun pipe, which further improves the stability of the above-mentioned nozzle assembly 7. The above-mentioned foam gun handle is connected with the above-mentioned foam gun pipe, so that the fire-fighting personnel can better hold the above-mentioned mid-expansion foam gun 3. The above-mentioned foaming barrel 9 is arranged in front of the above-mentioned nozzle gland 5, that is, away from one end of the above-mentioned thick neck part 42, so that when the foam mixed solution is sprayed out of the above-mentioned gland port 51, it is mixed with air to form quasi mid-expansion foam mixed with water, fire extinguishing foam and air, and prevent the quasi mid-expansion foam from overflowing outward.

[0032] In the above-mentioned embodiment, the air jet principle is used. When the foam mixed solution is sprayed out of the above-mentioned gland port 51, the flow rate forms a negative pressure around the above-mentioned gland port 51, inhales a large amount of air, and mixes the air with the foam mixed solution to form quasi mid-expansion foam. The mixing of air and foam mixed solution is a key step in forming quasi mid-expansion foam, because foam is essentially a mixture of gas and liquid. In addition, the addition of air can significantly increase the volume of quasi mid-expansion foam. After the volume of quasi mid-expansion foam increases, it can more effectively cover the surface of the burning liquid and isolate oxygen, thereby improving the fire extinguishing efficiency.

[0033] In the above-mentioned embodiment, preferably, the above-mentioned foaming barrel 9 comprises a screen 10 located at the output port of the above-mentioned foaming barrel 9 and covering the above-mentioned output port, that is, away from one end of the above-mentioned nozzle gland 5. The above-mentioned screen 10 has a grid structure for further foaming the quasi mid-expansion foam to finally form mid-expansion foam (also known as snowstorm foam). The mid-expansion foam formed according to the present application has the advantages of small amount of water grade foam liquid, strong foaming ability, long spraying distance compared with the same parameter foam equipment, high foaming multiple, short 50% liquid separation time, and strong fire extinguishing ability.

[0034] In the above-mentioned embodiment, preferably, the above-mentioned mid-expansion foam gun body 12 has a ball valve assembly 6 on one side, which is located at the input end of the above-mentioned foam liquid self-suction port 41, that is, the end receiving the fire-fighting foam liquid, for controlling the flow of fire-fighting foam liquid.

[0035] In the above embodiment, preferably, one end of each of the plurality of supports 8 is connected to the nozzle assembly 7, and the other end is connected to the connection part of the foaming cylinder 9 and the screen 10, so that the mid-expansion foam gun body 12 and the foaming cylinder 9 are fixedly connected, thereby improving the stability and integration of the mid-expansion foam gun 3. The supports 8 serve as connecting components to firmly connect the mid-expansion foam gun body 12 and the foaming cylinder 9 together to form an integral structure. This connection mode can effectively prevent relative movement or disconnection between the mid-expansion foam gun body 12 and the foaming cylinder 9 due to external force or vibration of the mid-expansion foam gun 3 during use, thereby ensuring the stability of the device during fire extinguishing operation and avoiding the influence of unstable structure of the mid-expansion foam gun 3 on the fire extinguishing effect.

[0036] In the above embodiment, preferably, one end of each of the plurality of supports 8 is connected to the nozzle assembly 7, and the other end is connected to the connection part of the foaming cylinder 9 and the screen 10, so that the mid-expansion foam gun body 12 and the foaming cylinder 9 are fixedly connected, thereby improving the stability and integration of the mid-expansion foam gun 3. The supports 8 serve as connecting components to firmly connect the mid-expansion foam gun body 12 and the foaming cylinder 9 together to form an integral structure. This connection mode can effectively prevent relative movement or disconnection between the mid-expansion foam gun body 12 and the foaming cylinder 9 due to external force or vibration of the mid-expansion foam gun 3 during use, thereby ensuring the stability of the device during fire extinguishing operation and avoiding the influence of unstable structure of the mid-expansion foam gun 3 on the fire extinguishing effect.

[0037] In the above embodiment, preferably, one end of each of the plurality of supports 8 is connected to the nozzle assembly 7, and the other end is connected to the connection part of the foaming cylinder 9 and the screen 10, so that the mid-expansion foam gun body 12 and the foaming cylinder 9 are fixedly connected, thereby improving the stability and integration of the mid-expansion foam gun 3. The supports 8 serve as connecting components to firmly connect the mid-expansion foam gun body 12 and the foaming cylinder 9 together to form an integral structure. This connection mode can effectively prevent relative movement or disconnection between the mid-expansion foam gun body 12 and the foaming cylinder 9 due to external force or vibration of the mid-expansion foam gun 3 during use, thereby ensuring the stability of the device during fire extinguishing operation and avoiding the influence of unstable structure of the mid-expansion foam gun 3 on the fire extinguishing effect.

[0038] In the above embodiment, one end of the handle 11 is connected to the handle connecting part 45, and the other end is connected to the outer wall of the foaming cylinder 9, so that the mid-expansion foam gun 3 can be conveniently lifted and moved. The user can carry the mid-expansion foam gun 3 by holding the handle 11, and the design of the handle 11 greatly improves the portability of the mid-expansion foam gun 3, especially in the case of needing to quickly move the mid-expansion foam gun 3 to deal with different fire extinguishing positions. In addition, during fire extinguishing, the user can hold the handle 11 to maintain the stability and accuracy of the operation of the mid-expansion foam gun 3.

[0039] According to another aspect of the present application, a mobile foam fire extinguishing device is provided. Figure 4 As shown in the structural schematic view of the mobile foam fire extinguishing device involved in the present application, Figure 4 The mobile foam fire extinguishing device comprises a foam box 1, a self-suction pipe 2, and the mid-expansion foam gun 3. The mid-expansion foam gun 3 comprises a mid-expansion foam gun body 12, supports 8, a foaming cylinder 9, and a handle 11. The mobile foam fire extinguishing device is equipped with the foam box 1 for storing fire extinguishing foam, and the capacity can be set by the user, for example, 20 kg. Preferably, a carrying strap can be provided on the outside of the foam box 1, so that the user can freely move while carrying the foam box 1.

[0040] In the above embodiment, the output end of the self-suction pipe 2 is communicated with the self-suction port 41 of the foam liquid, and the input end is inserted into the foam tank 1, so that the fire-fighting foam liquid can be transmitted from the foam tank 1 to the nozzle assembly 7. The mobile foam fire extinguishing device can use a hydrant, a fire truck or other water source to supply water, and the self-suction foam liquid is used to spray foam fire extinguishing, which has the advantage of high flexibility. The sprayed medium foam has the characteristics of small amount of water grade foam liquid, strong foaming ability, long spraying distance, high foaming multiple and strong fire extinguishing ability compared with the same parameter foam equipment.

[0041] In the above embodiment, the self-suction pipe 2 has a ball valve assembly 6 between the output end and the self-suction port 41 of the foam liquid, which is used to control the flow of the fire-fighting foam liquid.

[0042] The foregoing description of specific exemplary embodiments of the present application is intended to be illustrative only and is not intended to limit the present application to the precise forms described. Many modifications and variations are possible in light of the above teachings without departing from the spirit or essential characteristics of the present application. The particular exemplary embodiments were chosen and described in order to explain the principles of the present application and its practical application to thereby enable others skilled in the art to best utilize the present application and various embodiments with various modifications as are suited to the particular use contemplated.

[0043] Those skilled in the art can understand that the steps, measures and schemes in various operations, methods and processes discussed in the present application can be alternated, changed, combined or deleted. Further, other steps, measures and schemes in various operations, methods and processes discussed in the present application can also be alternated, changed, rearranged, decomposed, combined or deleted. Further, the steps, measures and schemes in the prior art with the various operations, methods and processes disclosed in the present application can also be alternated, changed, rearranged, decomposed, combined or deleted.

[0044] The above is only some embodiments of the present application, and it should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A medium-expansion foam gun, comprising a medium-expansion foam gun body, wherein the medium-expansion foam gun body includes a nozzle assembly, characterized in that, The nozzle assembly includes a nozzle body, which further includes a nozzle housing, a foam liquid self-priming port, and a liquid pipeline, wherein the liquid pipeline passes through the internal central axis of the nozzle housing. The liquid pipeline includes a thick neck, a tapered section, and a thin neck. The thick neck is located at the rear end of the nozzle body. One end of the tapered section is connected to the thick neck, and the other end is connected to the thin neck. The thin neck is located at the front end of the nozzle body. The foam liquid self-suction port is located on the side of the nozzle housing and extends to the narrow neck, and communicates with the narrow neck.

2. The medium-expansion foam gun according to claim 1, characterized in that, The nozzle assembly further includes a nozzle cap located at the front end of the nozzle assembly; the nozzle cap has a cap opening located at the center of the nozzle cap and corresponding to the output end of the narrow neck.

3. The medium-expansion foam gun according to claim 2, characterized in that, The medium-expansion foam gun includes a foaming cylinder located directly in front of the nozzle body and connected to the medium-expansion foam gun body via multiple brackets.

4. The medium-expansion foam gun according to claim 3, characterized in that, The foaming cylinder includes a screen, which is located at and covers the outlet of the foaming cylinder; One end of the bracket is connected to the nozzle assembly, and the other end is connected to the connection between the screen and the foaming cylinder.

5. The medium-expansion foam gun according to claim 3, characterized in that, One end of a portion of the plurality of supports is connected to the nozzle assembly, and the other end is fixedly connected to the foaming cylinder near the nozzle assembly.

6. The medium-expansion foam gun according to any one of claims 4-5, characterized in that, The nozzle body includes a handle connection part, which is connected to the outer wall of the foaming cylinder via a handle.

7. The medium-expansion foam gun according to claim 6, characterized in that, The main body of the medium-expansion foam gun includes a ball valve assembly located at the input end of the foam liquid self-priming port.

8. A mobile foam fire extinguishing device, characterized in that, Includes the medium-expansion foam gun as described in any one of claims 1-7.

9. The mobile foam fire extinguishing device according to claim 8, characterized in that, The mobile foam fire extinguishing device also includes a foam box and a self-priming pipe. One end of the self-priming pipe is inserted into the foam box, and the other end is connected to the foam liquid self-priming port.

10. The mobile foam fire extinguishing device according to claim 9, characterized in that, The ball valve assembly is located between the self-priming tube and the foam liquid self-priming port.

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