A double-layer jet fire-fighting foam spraying device

Abstract

A double-layer jet fire-fighting foam spraying device includes an outer shell, an inner core cylinder with two annular protrusions on its outer periphery forming an annular chamber between the two protrusions and the outer shell; a spray nozzle is inserted through the front end of the core cylinder, and a support plate is provided inside the support plate. A liquid outlet pipe is inserted through the inner ring of the support plate, and the liquid outlet pipe is connected to an L-shaped elbow outside the core cylinder; a double-layer jet hole is provided at the front end of the core cylinder; a P-shaped handle is provided at the top of the outer shell, the P-shaped handle including a horizontal pipe closed at both ends and a first vertical pipe and a second vertical pipe perpendicularly connected and communicating with the horizontal pipe, the second vertical pipe being connected to a Venturi assembly, the Venturi assembly being connected to the L-shaped elbow and a foam liquid connector; a water inlet base is provided at the bottom of the outer shell, and the water inlet base is connected to a water inlet pipe fitting.

Description

Technical Field

[0001] This invention relates to a fire-fighting device, and more particularly to a double-layer jet fire-fighting foam spraying device. Background Technology

[0002] When liquid foam extinguishing agent is mixed with water, the resulting foam forms a highly sealed foam layer on the surface of an object, thus isolating it from air and blocking or preventing combustion. In the event of a fire, the foam fire hose is connected to a water source with sufficient flow. As the water flows through a special passage within the hose, a negative pressure is created in the bypass, drawing in and mixing the foam extinguishing agent before it is finally sprayed from the nozzle. Therefore, it is essential to ensure that the liquid foam extinguishing agent is thoroughly mixed with the water and air during spraying to achieve a good foaming effect; simultaneously, a longer effective range is also desirable for efficient fire suppression.

[0003] Existing foam fire hoses often use a simple three-way structure, resulting in poor foaming effect, large loss of kinetic energy of water flow, short spray distance, and are relatively bulky. Summary of the Invention

[0004] In view of the shortcomings of existing equipment and technology, the purpose of this invention is to provide a double-layer jet fire-fighting foam spraying device, which can improve the foaming effect, increase the spraying distance, improve the fire extinguishing efficiency, and reduce the weight of the equipment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A double-layer jet fire-fighting foam spraying device includes a cylindrical outer shell, a cylindrical core tube inside the outer shell, two annular protrusions on the outer periphery of the core tube, and a sealing ring fitted around the outer periphery of each protrusion, so that a sealed annular cavity is formed between the two protrusions, the outer wall of the core tube, and the inner wall of the outer shell.

[0007] The front end of the core cylinder is fixedly provided with a spray nozzle communicating with the core cylinder, and a number of jet holes communicating with the annular chamber and the interior of the core cylinder are provided on the protrusion near the spray nozzle; the rear end of the core cylinder is fixedly connected to the rear end of the outer shell; a circular support plate is provided inside the core cylinder, and a liquid outlet pipe parallel to the axial direction of the core cylinder passes through the middle of the support plate.

[0008] The top of the housing has an upper mounting surface, and a first through hole is formed at a corresponding position on the upper mounting surface and the top of the housing. The first through hole communicates with the annular chamber. A P-shaped handle is mounted on the upper mounting surface. The P-shaped handle includes a horizontal tube closed at both ends, a first vertical tube and a second vertical tube perpendicularly connected and communicating with the horizontal tube, and a horizontal plate connecting the first vertical tube and the second vertical tube. The first vertical tube is near the front end of the housing, and the second vertical tube is near the rear end of the housing. The horizontal plate is fixedly connected to the upper mounting surface by bolts. The first vertical tube communicates with the first through hole. The bottom of the second vertical tube has a Venturi assembly. The Venturi assembly includes a tee with a vertically opposite water inlet, a mixed liquid outlet, and a horizontal foam liquid inlet. The water inlet is connected to and communicates with the bottom end of the second vertical tube. The foam liquid inlet is connected to a foam extinguishing agent connecting pipe.

[0009] The liquid outlet pipe is installed inside the core cylinder, with one end being the liquid outlet and the other end connected to an L-shaped elbow located outside the core cylinder. The top of the L-shaped elbow is connected to the liquid outlet. The bottom of the outer shell is provided with a lower mounting surface, and a through second hole is opened at the corresponding position of the lower mounting surface and the bottom of the outer shell. The second through hole communicates with the annular chamber. A water inlet base is installed on the lower mounting surface, and the water inlet base is connected to the water inlet pipe.

[0010] Furthermore, the jet orifice includes a first layer of jet orifice and a second layer of jet orifice, the first layer of jet orifice having an angle of 20° to 24° with the axis of the core cylinder, and the second layer of jet orifice having an angle of 14° to 18° with the axis of the core cylinder.

[0011] Furthermore, the inner cross-sectional area of ​​the rear end of the core tube is greater than or equal to the through-hole area of ​​the support plate, and the through-hole area of ​​the support plate is greater than or equal to the inner cross-sectional area of ​​the front end of the core tube.

[0012] Furthermore, the rear end of the spray nozzle passes through the front end of the core cylinder.

[0013] Furthermore, the support plate includes an outer ring, an inner ring, and connecting ribs between the outer ring and the inner ring, and the liquid outlet pipe passes through the inner ring of the support plate.

[0014] The beneficial effects of this invention are:

[0015] 1. This invention mixes the liquid foam extinguishing agent with water three times, allowing for thorough impact and resulting in excellent foaming effect;

[0016] 2. The two-layer angled jet holes of the present invention are arranged in an alternating pattern, which takes into account both the range and the foaming effect.

[0017] 3. The open air inlet of this invention ensures minimal loss of liquid kinetic energy;

[0018] 4. The present invention has a compact structure, is lightweight, and is easy to hold. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the double-layer jet fire-fighting foam spraying device of the present invention.

[0020] Figure 2 This is an enlarged schematic diagram of the Venturi component of the double-layer jet fire-fighting foam spraying device of the present invention.

[0021] Figure 3 This is an exploded schematic diagram of the double-layer jet fire-fighting foam spraying device of the present invention.

[0022] Figure 4 This is a schematic diagram of the structure at the jet hole of the double-layer jet fire-fighting foam spraying device of the present invention. Detailed Implementation

[0023] The structure of the present invention and the desired technical effects will be described below with reference to specific embodiments and accompanying drawings. However, the selected embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0024] like Figure 1 , Figure 2 , Figure 3 As shown, the present invention provides a double-layer jet fire-fighting foam spraying device, including a cylindrical outer shell 1, a cylindrical core 2 inside the outer shell 1, two annular protrusions 21 on the outer periphery of the core 2, and a sealing ring fitted around the outer periphery of the two protrusions 21, so that a sealed annular chamber 11 is formed between the two protrusions 21, the outer wall of the core 2, and the inner wall of the outer shell 1.

[0025] The front end of the core cylinder 2 is provided with a spray nozzle 3 that communicates with the core cylinder 2. Near the protrusion 21 of the spray nozzle 3, there are several jet holes 22 that communicate with the annular chamber 11 and the interior of the core cylinder 2, so that water can be sprayed from the annular chamber 11 through the jet holes 22 into the core cylinder 2. The rear end of the spray nozzle 3 is inserted into the front end of the core cylinder 2.

[0026] The rear end of the core cylinder 2 is fixedly connected to the rear end of the outer casing 1 by bolts 23. Inside the core cylinder 2 is a circular support plate 24, through which a liquid outlet pipe 25, parallel to the axial direction of the core cylinder 2, passes. The front end of the liquid outlet pipe is a liquid outlet, and its rear end is connected to an L-shaped elbow 26 located outside the core cylinder 2. Specifically, as... Figure 3 As shown, the support plate 24 includes an outer ring 241, an inner ring 242, and a connecting rib 243. The liquid outlet pipe 25 passes through the inner ring 242. Specifically, the core cylinder 2 has a variable cross-section cavity, with the inner cross-sectional area of ​​its rear end being greater than or equal to the through-hole area of ​​the support plate 24, and the through-hole area of ​​the support plate 24 being greater than or equal to the inner cross-sectional area of ​​the front end of the core cylinder 2, to ensure unobstructed air intake, which is beneficial for increasing the range.

[0027] The top of the outer casing 1 is provided with an upper mounting surface 12. A first through hole 121 is formed at a corresponding position on the upper mounting surface 12 and the top of the outer casing 1, communicating with the annular chamber 11. The upper mounting surface 12 is used to mount a P-shaped handle 4. The P-shaped handle 4 includes a horizontal tube 40 closed at both ends, and a first vertical tube 41 near the front end of the outer casing 1 and a second vertical tube 42 near the rear end of the outer casing 1, which are perpendicularly connected to the horizontal tube 40. A horizontal plate 43 is provided between the bottoms of the first vertical tube 41 and the second vertical tube 42, and the horizontal plate 43 is fixedly connected to the upper mounting surface 12 by bolts. The first vertical tube 41 communicates with the first through hole 121, and the bottom of the second vertical tube 42 is connected to and communicates with the Venturi assembly 5. The Venturi assembly 5 includes a tee 50, which has a vertically opposite water inlet 51, a mixture outlet 52, and a horizontal foam liquid inlet 53. The Venturi assembly 5 is connected to the second vertical pipe 42 through the water inlet 51, connected to the L-shaped elbow 26 through the mixture outlet 52, and connected to the foam extinguishing agent connecting pipe through the foam liquid inlet 53.

[0028] The bottom of the outer casing 1 is provided with a lower mounting surface 13, and a second through hole 131 is opened at a corresponding position on the lower mounting surface 13 and the bottom of the outer casing 1. The second through hole 131 communicates with the annular chamber 11. A water inlet base 6 is installed on the lower mounting surface 13, and the water inlet base 6 is connected to a water inlet pipe 7.

[0029] The usage process of this invention is as follows: The water inlet pipe 7 is connected to the water source pipe, and the foam liquid inlet 53 is connected to the liquid foam extinguishing agent through the foam extinguishing agent connecting pipe. Water flows through the water pipe and the water inlet base 6 into the annular cavity 11, and then into the P-shaped handle 4. When it flows through the second vertical pipe 42 and through the Venturi assembly 5, a bypass negative pressure is formed at the tee 50, which draws in the liquid foam extinguishing agent. The first mixing is achieved at the Venturi assembly 5, and the mixed liquid is sprayed out from the outlet. The core cylinder 2 is provided with a jet hole 22. The main water flow is sprayed out from the annular cavity 11 through the jet hole 22, and mixes again with the mixed liquid generated in the first mixing, and is finally sprayed out from the spray nozzle 3. Figure 4 As shown, the jet orifice 22 forms a certain angle with the first mixture (horizontal direction). The larger the angle (20° to 24°), the better the foaming effect (i.e., the first foaming); while the smaller the angle (14° to 18°), the longer the range (i.e., the second foaming). To achieve a good balance between range and foaming effect, two or more jet orifices with different angles can be mixed and interspersed. That is, the jet orifice 22 includes a first layer of jet orifices 221 and a second layer of jet orifices 222. The angle α between the first layer of jet orifices 221 and the axis of the core cylinder 2 is 20° to 24°, and the angle β between the second layer of jet orifices 222 and the axis of the core cylinder 2 is 14° to 18°.

[0030] The advantages of this invention are as follows:

[0031] 1. This invention utilizes a special internal channel design to achieve three-stage mixing of liquid foam extinguishing agent and water, resulting in more thorough mixing and a better foaming effect. Utilizing the Venturi effect, the water flow creates negative pressure as it passes through the bypass, drawing the liquid foam extinguishing agent into the channel for the first mixing. The mixture formed in the first mixing collides with the water flow from the first jet orifice, achieving a second mixing (i.e., the first foaming). It then collides with the water flow from the second jet orifice, achieving a third mixing (i.e., the second foaming), and finally, it is sprayed out from the nozzle of the gun head.

[0032] 2. The second mixing mentioned above involves mixing with the water jet ejected from the wide-angle jet orifice. The purpose of the wide-angle jet orifice is to ensure more thorough impact and mixing of the mixed flow, thereby guaranteeing a good foaming effect;

[0033] 3. The third mixing mentioned above is the mixing with the water jet ejected from the small-angle jet orifice. The significance of the small-angle jet orifice is to ensure that the kinetic energy loss of the liquid flow is small, so as to ensure the range of the liquid flow.

[0034] 4. This invention utilizes an external P-shaped hollow handle to achieve air diversion, ensuring that the air inlet is fully open and reducing kinetic energy loss caused by vacuum suction.

[0035] 5. This invention utilizes a hollow P-shaped handle to achieve flow diversion, eliminating the need for pipes, connectors, and other parts, thus reducing weight.

[0036] This invention is defined by the claims. However, based on this, those skilled in the art can make various obvious changes or modifications, all of which should be within the main spirit and protection scope of this invention.

Claims

1. A double-layer jet fire-fighting foam generating and spraying device, characterized in that, It includes a cylindrical outer shell, inside which is a cylindrical core. The core has two annular protrusions on its outer periphery, and each protrusion is fitted with a sealing ring, so that a sealed annular cavity is formed between the two protrusions, the outer wall of the core, and the inner wall of the outer shell. The front end of the core cylinder is fixedly provided with a spray nozzle communicating with the core cylinder, and a number of jet holes communicating with the annular chamber and the interior of the core cylinder are provided on the protrusion near the spray nozzle; the rear end of the core cylinder is fixedly connected to the rear end of the outer shell; a circular support plate is provided inside the core cylinder, and a liquid outlet pipe parallel to the axial direction of the core cylinder passes through the middle of the support plate. The top of the housing has an upper mounting surface, and a first through hole is formed at a corresponding position on the upper mounting surface and the top of the housing. The first through hole communicates with the annular chamber. A P-shaped handle is mounted on the upper mounting surface. The P-shaped handle includes a horizontal tube closed at both ends, a first vertical tube and a second vertical tube perpendicularly connected and communicating with the horizontal tube, and a horizontal plate connecting the first vertical tube and the second vertical tube. The first vertical tube is near the front end of the housing, and the second vertical tube is near the rear end of the housing. The horizontal plate is fixedly connected to the upper mounting surface by bolts. The first vertical tube communicates with the first through hole. The bottom of the second vertical tube has a Venturi assembly. The Venturi assembly includes a tee with a vertically opposite water inlet, a mixed liquid outlet, and a horizontal foam liquid inlet. The water inlet is connected to and communicates with the bottom end of the second vertical tube. The foam liquid inlet is connected to a foam extinguishing agent connecting pipe. The liquid outlet pipe is installed inside the core cylinder, with one end being the liquid outlet and the other end connected to an L-shaped elbow located outside the core cylinder. The top of the L-shaped elbow is connected to the mixture outlet. The bottom of the outer shell is provided with a lower mounting surface, and a through second hole is opened at a corresponding position on the lower mounting surface and the bottom of the outer shell. The second through hole communicates with the annular chamber. A water inlet base is installed on the lower mounting surface, and the water inlet base is connected to the water inlet pipe. The jet orifice includes a first layer of jet orifice and a second layer of jet orifice. The angle between the first layer of jet orifice and the axis of the core cylinder is 20° to 24°, and the angle between the second layer of jet orifice and the axis of the core cylinder is 14° to 18°.

2. The double-layer jet fire-fighting foam spraying device according to claim 1, characterized in that: The inner cross-sectional area of ​​the rear end of the core cylinder is greater than or equal to the through-hole area of ​​the support plate, and the through-hole area of ​​the support plate is greater than or equal to the inner cross-sectional area of ​​the front end of the core cylinder.

3. The double-layer jet fire-fighting foam spraying device according to claim 1 or 2, characterized in that: The support plate includes an outer ring, an inner ring, and several connecting ribs between the outer ring and the inner ring, and the liquid outlet pipe passes through the inner ring.

Images