Gun body capable of adjusting mixing proportion and self-suction foam gun
By designing an adjustable mixing ratio gun body and self-priming inner tube structure in the fire foam gun, the existing fire foam gun has solved the problems of low self-priming function and inconvenient mixing ratio adjustment, achieving a longer range and a more flexible fire extinguishing effect.
Patent Information
- Application Number
- CN202421803004.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-29
AI Technical Summary
The existing firefighting foam guns have low self-priming function and cannot effectively adjust the mixing ratio of foam liquid and water, resulting in shortening of range and poor fire extinguishing effect.
A gun body with adjustable mixing ratio is designed. By setting two foam branches on both sides of the main body of the pipeline and installing a mixing ratio adjustment ball valve on it, the mixing ratio adjustment of multiple gears is achieved. At the same time, a self-priming inner tube structure is adopted to absorb foam liquid using the negative pressure cavity to ensure that the water pressure is not lost and the range is longer.
A longer range and more flexible fire extinguishing effect are achieved, and the mixing ratio of foam liquid and water can be adjusted according to different fire types and environments, thereby improving fire extinguishing efficiency.
Smart Images
Figure CN222900083U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of foam guns, in particular to a gun body with adjustable mixing ratio and a self-priming foam gun. Background Art
[0002] A fire-fighting foam gun is a device used to extinguish fires. It is usually used for Class B liquid fires and can also be used for Class A general solid fires. Its main working principle is to use the principle of positive pressure or negative pressure to mix foam liquid and water and then spray them out. Different from a fire-fighting water gun, because it mixes foam liquid, it can better extinguish Class B liquid fires. Class B fires refer to liquid fires and fires of meltable solid substances, such as kerosene, diesel, crude oil, methanol, ethanol, asphalt, paraffin, etc. Of course, the fire-fighting foam gun also has disadvantages. Because the foam is lighter, the spraying distance will be shortened, and the range is shorter than that of the fire-fighting water gun at the same flow rate and pressure.
[0003] The foam liquid has several advantages in extinguishing Class B liquid fires: 1. Oxygen isolation and asphyxiation effect: The foam of the foam liquid can isolate the liquid from the air, reduce the oxygen supply, and thus inhibit combustion; 2. Radiation heat barrier effect: The foam layer formed by the foam liquid can isolate the radiant heat of the fire source and reduce the fire intensity; 3. Heat absorption and cooling effect: When the foam liquid coats the surface of the fire source, it absorbs heat, causing the temperature of the fire source to drop, thereby achieving the fire extinguishing effect. Therefore, the fire-fighting foam gun plays an irreplaceable important role in Class B fires.
[0004] It should be noted that the fire-fighting foam gun generally mixes water and foam liquid in a certain ratio. For example, 3% foam liquid + 97% water, or 6% foam liquid + 94% water. Selecting the correct mixing ratio depends on the type of fire and the usage environment of the foam gun. Foam liquids with different mixing ratios have different fire extinguishing effects. Therefore, in actual operation, it is necessary to select a suitable mixing ratio according to the situation to achieve a better fire extinguishing effect and give full play to the role of the foam liquid more effectively.
[0005] The existing fire-fighting foam guns have a self-priming function, and usually, this self-priming function is achieved through a simple Venturi structure, that is, a straight-through Venturi structure with different diameters at both ends. This will waste the pressure at the water inlet end, and all the pressure difference is used to suck the foam liquid, resulting in a reduced range. In addition, most of the existing fire-fighting foam guns do not have the ability to adjust the mixing ratio. Very few are adjustable, but due to the influence of the structural space, they are only adjustable in 3 gears (0, 3%, 6%), and they do not have more compatibility to adjust the foam mixing ratio. Summary of the Utility Model
[0006] Therefore, the technical problem to be solved by the present utility model is to overcome the above problems existing in the prior art.
[0007] To solve the above technical problems, the present utility model provides a gun body with adjustable mixing ratio, including:
[0008] A pipeline main body, with a water inlet provided at the front end of the pipeline main body and a mixed liquid outlet provided at the tail end of the pipeline main body;
[0009] Two foam branch pipes, symmetrically arranged on both sides of the pipeline main body; one end of the foam branch pipe is provided with a foam inlet; a mixing ratio adjusting ball valve for adjusting the foam flow rate is provided at the foam inlet;
[0010] A self-priming inner pipe, coaxially arranged in the pipeline main body; the middle part of the self-priming inner pipe is a negative pressure cavity, and liquid inlets communicated with it are respectively provided on both sides of the negative pressure cavity; the two ends of the negative pressure cavity are respectively a first inlet and a first outlet; a front-end channel communicated with the first inlet is provided at the front end of the self-priming inner pipe, and the front-end channel is connected with a metal adapter; along the axial direction of the metal adapter, the tail end of the metal adapter extends to a position half of the liquid inlet; a tail-end channel communicated with the first outlet is provided at the tail end of the self-priming inner pipe;
[0011] Among them, the adjustment of the multi-gear mixing ratio is achieved by respectively adjusting the mixing ratio adjusting ball valves on the two foam branch pipes.
[0012] In an embodiment of the present utility model, on the premise of meeting the foam flow rate, the ratio of the caliber of the tail end of the metal adapter to the caliber of the mixed liquid outlet is greater than 6:94.
[0013] In an embodiment of the present utility model, the mixing ratio adjusting ball valve includes a connecting rod and a ball seat connected to one end of the connecting rod; the connecting rod is rotatably connected to the foam branch pipe; the ball seat is hollow, and a plurality of through holes are arranged at intervals along the circumferential direction of the connecting rod on the wall body of the ball seat, and the apertures of the plurality of through holes are different; rotating the connecting rod enables one of the plurality of through holes to communicate with the foam inlet; the axis of rotation of the ball seat is perpendicular to the axis of the foam branch pipe.
[0014] In an embodiment of the present utility model, there are 5 through holes, and the 5 through holes are evenly distributed on the side wall of the ball seat at 60°; the mixing ratios corresponding to the 5 through holes are 0, 0.1%, 0.5%, 1%, 2% and 3%.
[0015] In an embodiment of the present utility model, the other end of the connecting rod extends outside the foam branch pipe and is connected with a knob.
[0016] In an embodiment of the present utility model, the outer wall of the knob has a plurality of edges; the edges on the outer wall of the knob are arranged in one-to-one correspondence with the through holes; mixing ratio marks are respectively engraved on each edge of the outer wall of the knob.
[0017] In an embodiment of the present utility model, the pipeline body includes a first branch pipe, an intermediate transition pipe, and a second branch pipe; the first branch pipe and the second branch pipe are respectively connected to the front end and the tail end of the intermediate transition pipe; the axis of the first branch pipe is parallel and disposed above the axis of the second branch pipe.
[0018] In an embodiment of the present utility model, the metal adapter is detachably connected in the front-end channel.
[0019] In an embodiment of the present utility model, the metal adapter has multiple specifications, and the caliber of each specification of the metal adapter is different.
[0020] The present utility model also provides a self-priming foam gun, including:
[0021] The gun body with adjustable mixing ratio in the above-mentioned embodiment;
[0022] A valve body, one end of which is connected to the water inlet of the gun body, and the valve body is used to control the opening and closing of the water inlet of the self-priming foam gun;
[0023] A gun head, which is connected to the tail end of the gun body.
[0024] The above technical solution of the present utility model has the following advantages compared with the prior art:
[0025] For the gun body with adjustable mixing ratio and the self-priming foam gun of the present utility model, two foam branch pipes are provided, and mixing ratio adjustment ball valves capable of separately controlling and adjusting the flow rates of their respective foam branch pipes are respectively provided on the two foam branch pipes, so as to adjust the mixing ratio in multiple gears. Secondly, in this embodiment, the self-priming inner pipe is coaxially disposed in the pipeline body. The pipeline body realizes the suction of the foam liquid. A small part of the water entering the water inlet of the pipeline body enters the self-priming inner pipe to complete the suction of the foam liquid, and another large part of the water flow (main body water) reaches the mixing liquid outlet to be mixed with the foam liquid. Since the total water inflow at the water inlet of the water entering the self-priming inner pipe is very small, no pressure drop of the water pressure will be caused at the mixing liquid outlet, so the shooting range will be farther than that of a foam gun of the same model (rated working pressure and flow rate). In addition, since two foam branch pipes are symmetrically arranged on both sides of the pipeline body in this embodiment, the two foam branch pipes will interfere with each other when entering the negative pressure cavity under negative pressure. Through experiments, when the tail end of the metal adapter extends to half of the position of the liquid inlet, the flow rates of the two foam branch pipes for sucking foam are the largest. Description of the Drawings
[0026] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to the specific embodiments of the present utility model in conjunction with the drawings, wherein:
[0027] Figure 1It is a three-dimensional schematic diagram of a gun body with adjustable mixing ratio and a self-priming foam gun in a preferred embodiment of the present utility model;
[0028] Figure 2 It is Figure 1 the front view of;
[0029] Figure 3 It is Figure 2 the A-A cross-sectional view of;
[0030] Figure 4 It is Figure 1 a three-dimensional schematic diagram of a gun body with adjustable mixing ratio and the gun body with adjustable mixing ratio in a self-priming foam gun;
[0031] Figure 5 It is Figure 4 the front view of;
[0032] Figure 6 It is Figure 5 the A-A cross-sectional view of;
[0033] Figure 7 It is Figure 1 a cross-sectional view of a gun body with adjustable mixing ratio and the gun body with adjustable mixing ratio in a self-priming foam gun;
[0034] Explanation of reference numerals in the drawings of the specification: 1000, gun body with adjustable mixing ratio; 2000, valve body; 3000, gun head;
[0035] 100, main pipe body; 110, water inlet; 120, mixed liquid outlet; 130, first branch pipe; 140, intermediate transition pipe; 150, second branch pipe;
[0036] 200, foam branch pipe; 210, foam inlet; 220, mixing ratio adjustment ball valve; 221, connecting rod; 222, ball seat; 223, through hole; 224, knob; 225, identifier;
[0037] 300, self-priming inner pipe; 310, negative pressure chamber; 311, liquid inlet; 312, first inlet; 313, first outlet; 320, front-end channel; 330, metal adapter; 340, tail-end channel. Detailed implementation manners
[0038] The following further illustrates the present utility model in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the specific embodiments cited shall not be construed as a limitation to the present utility model.
[0039] In some comparative embodiments, a foam branch pipe is provided, and the tail end of the metal adapter extends and blocks the entire pipe orifice of the liquid inlet. A reserved gap is provided between the metal adapter and the foam branch pipe. This results in the interception of the foam liquid, and the actual flow rate of the foam liquid can only reach the flow rate of the gap at most, with a small and unstable flow rate.
[0040] Referring to Figures 1 to 7 As shown, an embodiment of the present invention provides a self-priming foam gun, including: a gun body 1000 with adjustable mixing ratio, a valve body 2000, and a gun head 3000.
[0041] The gun body 1000 with adjustable mixing ratio includes:
[0042] A pipeline main body 100, with a water inlet 110 provided at the front end of the pipeline main body 100, and a mixed liquid outlet 120 provided at the tail end of the pipeline main body 100;
[0043] Two foam branch pipes 200, symmetrically arranged on both sides of the pipeline main body 100; one end of the foam branch pipe 200 is provided with a foam inlet 210, and the foam inlet 210 is externally connected to a foam storage tank (for example, a foam liquid ton barrel) to supply foam liquid. The foam inlet 210 is provided with a mixing ratio adjustment ball valve 220 for adjusting the foam flow rate; when the water flow rate remains unchanged, the foam flow rate is adjusted through the mixing ratio adjustment ball valve 220 to adjust the ratio between the two.
[0044] A self-priming inner pipe 300, coaxially arranged in the pipeline main body 100; the middle part of the self-priming inner pipe 300 is a negative pressure cavity 310, and liquid inlet ports 311 communicating with it are respectively provided on both sides of the negative pressure cavity 310; the two ends of the negative pressure cavity 310 are respectively a first inlet 312 and a first outlet 313; the front end of the self-priming inner pipe 300 is provided with a front-end channel 320 communicating with the first inlet 312, and the front-end channel 320 is connected with a metal adapter 330; along the axial direction of the metal adapter 330, the tail end of the metal adapter 330 extends to a position half of the liquid inlet port 311; the tail end of the self-priming inner pipe 300 is provided with a tail-end channel 340 communicating with the first outlet 313; the caliber of the front end of the tail-end channel 340 is smaller than the caliber of the first outlet 313, and the caliber of the front end of the metal adapter 330 is larger than the caliber of the tail end of the metal adapter 330; on the premise of meeting the foam flow rate, the pipe diameter of the self-priming inner pipe 300 is reduced as much as possible.
[0045] Wherein, the other end of the foam branch pipe 200 passes through the pipe body 100 and communicates with the liquid inlet 311; part of the water entering the water inlet 110 enters the mixed liquid outlet 120 from the pipe body 100, and the other part enters the negative pressure chamber 310 from the metal adapter 330 to form a negative pressure to suck the foam liquid from the two foam branch pipes 200 respectively, and then discharges the foam liquid from the tail end channel 340 to be mixed with the water at the mixed liquid outlet 120; the mixing ratio regulating ball valves 220 on the two foam branch pipes 200 are adjusted respectively to realize the adjustment of the mixing ratio in multiple gears.
[0046] One end of the valve body 2000 is connected to the water inlet 110 of the gun body. The valve body 2000 is used to control the opening and closing of the water inlet of the self-priming foam gun; the other end of the valve body 2000 is externally connected to a fire hose to supply water to the self-priming foam gun.
[0047] The gun head 3000 is connected to the tail end of the gun body. After the water and the foam liquid are evenly mixed through a flow channel in the gun head 3000, they are sprayed for fire extinguishing.
[0048] Specifically, in this embodiment, two foam branch pipes 200 are provided, and the two foam branch pipes 200 are respectively provided with mixing ratio regulating ball valves 220 that can separately control and adjust the flow rates of their respective foam branch pipes 200, so as to adjust the mixing ratio in multiple gears. Secondly, the self-priming inner pipe 300 in this embodiment is coaxially arranged in the pipe body 100. The pipe body 100 realizes the suction of the foam liquid. A small part of the water entering the water inlet 110 of the pipe body 100 enters the self-priming inner pipe 300 to complete the suction of the foam liquid, and the other large part of the water flow (main body water) reaches the mixed liquid outlet 120 to be mixed with the foam liquid. Since the total water inflow of the water entering the self-priming inner pipe 300 at the water inlet 110 is very small, it will not cause a pressure drop in the water pressure at the mixed liquid outlet 120. Therefore, the range will be farther than that of a foam gun of the same model (rated working pressure and flow rate). In addition, since two foam branch pipes 200 are symmetrically arranged on both sides of the pipe body 100 in this embodiment, the two foam branch pipes 200 will interfere with each other when entering the negative pressure chamber 310 under negative pressure. When the tail end of the metal adapter 330 extends to half of the position of the liquid inlet 311, the flow rates of the two foam branch pipes 200 sucking the foam are the largest. The experimental results are shown in Table 1 below.
[0049] Table 1:
[0050] Serial number Inlet pressure Water flow rate Insertion length Foam liquid suction volume 1 8 bar 760 LPM Not inserted 16L 2 8 bar 760 LPM Inserted halfway 22L 3 8 bar 760 LPM Fully inserted 19.5L
[0051] It can be seen that this embodiment can not only meet the requirement of not reducing the water pressure of the main flow channel, but also realize the adjustment of the mixing ratio in multiple gears.
[0052] Further, on the premise that the caliber of the metal adapter 330 meets the foam flow rate, the ratio of the caliber of the tail end of the metal adapter 330 to the caliber of the mixed liquid outlet 120 is greater than 6:94 to ensure that the maximum mixing ratio is greater than 6%.
[0053] Further, the mixing ratio adjusting ball valve 220 includes a connecting rod 221 and a ball seat 222 connected to one end of the connecting rod 221; the connecting rod 221 is rotatably connected to the foam branch pipe 200; the ball seat 222 is hollow, and a plurality of through holes 223 are arranged at intervals along the circumferential direction of the connecting rod 221 on the wall of the ball seat 222, and the apertures of the plurality of through holes 223 are different; rotating the connecting rod 221 enables one of the plurality of through holes 223 to communicate with the foam inlet 210; the axis of rotation of the ball seat 222 is perpendicular to the axis of the foam branch pipe 200. Specifically, the structure of this embodiment is simple, stable and reliable.
[0054] Further, there are 5 through holes 223, and the 5 through holes 223 are evenly distributed on the side wall of the ball seat 222 at 60°; the mixing ratios corresponding to the 5 through holes 223 are 0, 0.1%, 0.5%, 1%, 2% and 3%. According to statistical calculations, the adjustment range of the mixing ratio from 0.1% to 6% is the most suitable range for the fire-fighting foam extinguishing mixing ratio; and within this range, the more gears there are, the better the adaptability of the foam gun. Specifically, the 5 through holes 223 in this embodiment can produce 6 states of foam liquid interception effects, that is, each foam branch pipe 200 can correspond to 6 mixing ratios (the gears of 0, 0.1%, 0.5%, 1%, 2%, 3%). It should be noted that when the aperture of the through hole 223 is 0, the mixing ratio is 0. In this way, in this application, the two foam branch pipes 200 respectively adjust their mixing ratio adjusting ball valves 220, so that the two foam branch pipes 200 can achieve mixing ratios of 0, 0.1%, 0.2%, 0.5%, 0.6%, 1%, 1.1%, 1.5%, 2%, 2.1%, 2.5%, 3%, 3.1%, 3.5%, 4%, 5% and 6%, a total of 17 gears. It should be noted that the difference between the 1.1% gear and the 1.0% gear is not significant, the difference between the 2.1% gear and the 2.0% gear is not significant, and the difference between the 3.1% gear and the 3.0% gear is not significant. Therefore, in actual use, the 1.1% gear, the 2.1% gear and the 3.1% gear are not set for use. Thus, it can be seen that the mixing ratio of this embodiment can be adjusted within the range of 0-6%, can meet all fire-fighting foam extinguishing requirements, and can achieve 17-gear adjustment within this range, thereby improving the adaptability of this foam gun.
[0055] Further, the other end of the connecting rod 221 extends outside the foam branch pipe 200 and is connected with a knob 224. Specifically, the rotation of the ball seat 222 is realized by rotating the knob 224, which is convenient and labor-saving to operate.
[0056] Further, the outer wall of the knob 224 has a plurality of edges; the edges of the outer wall of the knob 224 are arranged in one-to-one correspondence with the through holes 223; and a mixing ratio mark 225 is engraved on each edge of the outer wall of the knob 224. Since rotating the knob 224 allows different through holes 223 to communicate with the foam inlet 210, the flow rate of the foam entering the foam branch pipe 200 is adjusted. Then, by calculating the flow rate of the water from the water inlet 110, the mixing ratio of the two can be obtained. And since the mark 225 on each edge corresponds to each through hole 223, each mark 225 can reflect the mixing ratio under the corresponding through hole 223. Thus, it can be seen that the mixing ratio mark 225 provided in this embodiment is used to mark the mixing ratio of the foam and water. The operator can adjust the mixing ratio by rotating the knob 224, and can clearly know the mixing ratio through this mark 225.
[0057] Further, the pipe body 100 includes a first branch pipe 130, an intermediate transition pipe 140, and a second branch pipe 150; the first branch pipe 130 and the second branch pipe 150 are respectively connected to the front end and the tail end of the intermediate transition pipe 140; the axis of the first branch pipe 130 is parallel and disposed above the axis of the second branch pipe 150. Since the foam branch pipes 200 are respectively provided on both sides of the pipe body 100, in order to avoid the operation interference between the gun body and the valve body 2000 under the limited volume of the gun body, the first branch pipe 130 and the second branch pipe 150 are arranged in a vertically staggered manner. Thus, the structure of the self-priming foam gun is made more compact.
[0058] Further, the metal adapter 330 is detachably connected in the front-end channel 320. The metal adapter 330 has a variety of specifications, and the caliber of each specification of the metal adapter 330 is different. Specifically, when the mixing ratio remains unchanged, if the flow rate of the gun body is larger, the caliber of the metal adapter 330 is relatively larger. Therefore, in this embodiment, different specifications of the metal adapter 330 can be replaced to adapt to gun bodies with different flow rates.
[0059] When the present application is in use, a fire hose is connected to the valve body 2000, and the foam branch pipe 200 is inserted into the foam liquid ton barrel. The handle of the valve body 2000 is pulled backward to open it. After water enters from the water inlet 110 of the gun body, a large part of the water (main body water) enters the pipe body 100 and then flows to the mixed liquid outlet 120, and the pressure of the main body water is not lost. A small part of the water flows into the self-priming inner pipe 300 to suck the foam liquid (the self-priming inner pipe 300 is a Venturi structure, forming a negative pressure effect and capable of sucking the foam liquid). Then, the main body water and the foam liquid are fully mixed in the pipe of the gun head 3000 and are ejected from the gun head 3000 for fire extinguishing.
[0060] Obviously, the above embodiments are merely examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the creation of the present utility model.
Claims
1. A gun body with adjustable mixing ratio, characterized in that: include: A pipe body, wherein a water inlet is provided at the front end of the pipe body and a mixed liquid outlet is provided at the rear end of the pipe body; Two foam branch pipes are symmetrically arranged on both sides of the pipeline body; one end of the foam branch pipe is provided with a foam inlet; the foam inlet is provided with a mixing ratio regulating ball valve for regulating the foam flow; The self-priming inner tube is coaxially arranged in the pipeline body; the middle part of the self-priming inner tube is a negative pressure chamber, and the two sides of the negative pressure chamber are respectively provided with liquid inlets connected thereto; the two ends of the negative pressure chamber are respectively a first inlet and a first outlet; the front end of the self-priming inner tube is provided with a front channel connected to the first inlet, and the front channel is connected to a metal adapter; along the axial direction of the metal adapter, the tail end of the metal adapter extends to the position of half of the liquid inlet; the tail end of the self-priming inner tube is provided with a tail end channel connected to the first outlet; The mixing ratio adjustment ball valves on the two foam branch pipes are adjusted to adjust the mixing ratio in multiple gears.
2. The gun body with adjustable mixing ratio according to claim 1, characterized in that: On the premise that the foam flow rate is satisfied, the ratio of the diameter of the tail end of the metal adapter to the diameter of the mixed liquid outlet is greater than 6:
94.
3. The gun body with adjustable mixing ratio according to claim 1, characterized in that: The mixing ratio regulating ball valve includes a connecting rod and a ball seat connected to one end of the connecting rod; the connecting rod is rotatably connected to the foam branch pipe; the ball seat is hollow, and a plurality of through holes are provided on the wall of the ball seat at intervals along the circumference of the connecting rod, and the apertures of the plurality of through holes are different; the connecting rod is rotated so that one of the plurality of through holes is connected to the foam inlet; the axis of rotation of the ball seat is perpendicular to the axis of the foam branch pipe.
4. The gun body with adjustable mixing ratio according to claim 3, characterized in that: There are five through holes, and the five through holes are evenly distributed at 60 degrees on the side wall of the ball seat; the mixing ratios corresponding to the five through holes are 0, 0.1%, 0.5%, 1%, 2% and 3%.
5. The gun body with adjustable mixing ratio according to claim 3, characterized in that: The other end of the connecting rod extends outside the foam branch pipe and is connected with a knob.
6. The gun body with adjustable mixing ratio according to claim 5, characterized in that: The outer wall of the knob has a plurality of edges; the edges of the outer wall of the knob are arranged in one-to-one correspondence with the through holes; and a mixing ratio mark is engraved on each edge of the outer wall of the knob.
7. The gun body with adjustable mixing ratio according to claim 1, characterized in that: The pipeline body includes a first branch pipe, an intermediate transition pipe and a second branch pipe; the first branch pipe and the second branch pipe are respectively connected to the front end and the rear end of the intermediate transition pipe; the axis of the first branch pipe is arranged parallel to and above the axis of the second branch pipe.
8. The gun body with adjustable mixing ratio according to claim 1, characterized in that: The metal adapter is detachably connected in the front channel.
9. The gun body with adjustable mixing ratio according to claim 8, characterized in that: The metal adapter has multiple specifications, and the caliber of each specification of the metal adapter is different.
10. A self-priming foam gun, characterized in that: include: The gun body with adjustable mixing ratio according to any one of claims 1 to 9; A valve body, one end of which is connected to the water inlet of the gun body, and the valve body is used to control the opening and closing of the water inlet of the self-priming foam gun; The gun head is connected to the rear end of the gun body.